From: Rafal Ozieblo Date: Thu, 29 Jun 2017 06:13:46 +0000 (+0100) Subject: net: macb: macb.c changed to macb_main.c X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b83f1527d098c04424832b0a59d75046e26bfff1;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git net: macb: macb.c changed to macb_main.c In case that macb is compiled as a module, macb.c has been renamed to macb_main.c to avoid naming confusion in Makefile. Signed-off-by: Rafal Ozieblo Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/cadence/Makefile b/drivers/net/ethernet/cadence/Makefile index 4ba75594d5c5..31ea6e34147a 100644 --- a/drivers/net/ethernet/cadence/Makefile +++ b/drivers/net/ethernet/cadence/Makefile @@ -1,6 +1,7 @@ # # Makefile for the Atmel network device drivers. # +macb-y := macb_main.o obj-$(CONFIG_MACB) += macb.o obj-$(CONFIG_MACB_PCI) += macb_pci.o diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c deleted file mode 100644 index 2d43a7619f58..000000000000 --- a/drivers/net/ethernet/cadence/macb.c +++ /dev/null @@ -1,3588 +0,0 @@ -/* - * Cadence MACB/GEM Ethernet Controller driver - * - * Copyright (C) 2004-2006 Atmel Corporation - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include "macb.h" - -#define MACB_RX_BUFFER_SIZE 128 -#define RX_BUFFER_MULTIPLE 64 /* bytes */ - -#define DEFAULT_RX_RING_SIZE 512 /* must be power of 2 */ -#define MIN_RX_RING_SIZE 64 -#define MAX_RX_RING_SIZE 8192 -#define RX_RING_BYTES(bp) (macb_dma_desc_get_size(bp) \ - * (bp)->rx_ring_size) - -#define DEFAULT_TX_RING_SIZE 512 /* must be power of 2 */ -#define MIN_TX_RING_SIZE 64 -#define MAX_TX_RING_SIZE 4096 -#define TX_RING_BYTES(bp) (macb_dma_desc_get_size(bp) \ - * (bp)->tx_ring_size) - -/* level of occupied TX descriptors under which we wake up TX process */ -#define MACB_TX_WAKEUP_THRESH(bp) (3 * (bp)->tx_ring_size / 4) - -#define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \ - | MACB_BIT(ISR_ROVR)) -#define MACB_TX_ERR_FLAGS (MACB_BIT(ISR_TUND) \ - | MACB_BIT(ISR_RLE) \ - | MACB_BIT(TXERR)) -#define MACB_TX_INT_FLAGS (MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP)) - -/* Max length of transmit frame must be a multiple of 8 bytes */ -#define MACB_TX_LEN_ALIGN 8 -#define MACB_MAX_TX_LEN ((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1))) -#define GEM_MAX_TX_LEN ((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1))) - -#define GEM_MTU_MIN_SIZE ETH_MIN_MTU -#define MACB_NETIF_LSO (NETIF_F_TSO | NETIF_F_UFO) - -#define MACB_WOL_HAS_MAGIC_PACKET (0x1 << 0) -#define MACB_WOL_ENABLED (0x1 << 1) - -/* Graceful stop timeouts in us. We should allow up to - * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions) - */ -#define MACB_HALT_TIMEOUT 1230 - -/* DMA buffer descriptor might be different size - * depends on hardware configuration: - * - * 1. dma address width 32 bits: - * word 1: 32 bit address of Data Buffer - * word 2: control - * - * 2. dma address width 64 bits: - * word 1: 32 bit address of Data Buffer - * word 2: control - * word 3: upper 32 bit address of Data Buffer - * word 4: unused - * - * 3. dma address width 32 bits with hardware timestamping: - * word 1: 32 bit address of Data Buffer - * word 2: control - * word 3: timestamp word 1 - * word 4: timestamp word 2 - * - * 4. dma address width 64 bits with hardware timestamping: - * word 1: 32 bit address of Data Buffer - * word 2: control - * word 3: upper 32 bit address of Data Buffer - * word 4: unused - * word 5: timestamp word 1 - * word 6: timestamp word 2 - */ -static unsigned int macb_dma_desc_get_size(struct macb *bp) -{ -#ifdef MACB_EXT_DESC - unsigned int desc_size; - - switch (bp->hw_dma_cap) { - case HW_DMA_CAP_64B: - desc_size = sizeof(struct macb_dma_desc) - + sizeof(struct macb_dma_desc_64); - break; - case HW_DMA_CAP_PTP: - desc_size = sizeof(struct macb_dma_desc) - + sizeof(struct macb_dma_desc_ptp); - break; - case HW_DMA_CAP_64B_PTP: - desc_size = sizeof(struct macb_dma_desc) - + sizeof(struct macb_dma_desc_64) - + sizeof(struct macb_dma_desc_ptp); - break; - default: - desc_size = sizeof(struct macb_dma_desc); - } - return desc_size; -#endif - return sizeof(struct macb_dma_desc); -} - -static unsigned int macb_adj_dma_desc_idx(struct macb *bp, unsigned int desc_idx) -{ -#ifdef MACB_EXT_DESC - switch (bp->hw_dma_cap) { - case HW_DMA_CAP_64B: - case HW_DMA_CAP_PTP: - desc_idx <<= 1; - break; - case HW_DMA_CAP_64B_PTP: - desc_idx *= 3; - break; - default: - break; - } - return desc_idx; -#endif - return desc_idx; -} - -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT -static struct macb_dma_desc_64 *macb_64b_desc(struct macb *bp, struct macb_dma_desc *desc) -{ - if (bp->hw_dma_cap & HW_DMA_CAP_64B) - return (struct macb_dma_desc_64 *)((void *)desc + sizeof(struct macb_dma_desc)); - return NULL; -} -#endif - -/* Ring buffer accessors */ -static unsigned int macb_tx_ring_wrap(struct macb *bp, unsigned int index) -{ - return index & (bp->tx_ring_size - 1); -} - -static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue, - unsigned int index) -{ - index = macb_tx_ring_wrap(queue->bp, index); - index = macb_adj_dma_desc_idx(queue->bp, index); - return &queue->tx_ring[index]; -} - -static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue, - unsigned int index) -{ - return &queue->tx_skb[macb_tx_ring_wrap(queue->bp, index)]; -} - -static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index) -{ - dma_addr_t offset; - - offset = macb_tx_ring_wrap(queue->bp, index) * - macb_dma_desc_get_size(queue->bp); - - return queue->tx_ring_dma + offset; -} - -static unsigned int macb_rx_ring_wrap(struct macb *bp, unsigned int index) -{ - return index & (bp->rx_ring_size - 1); -} - -static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index) -{ - index = macb_rx_ring_wrap(bp, index); - index = macb_adj_dma_desc_idx(bp, index); - return &bp->rx_ring[index]; -} - -static void *macb_rx_buffer(struct macb *bp, unsigned int index) -{ - return bp->rx_buffers + bp->rx_buffer_size * - macb_rx_ring_wrap(bp, index); -} - -/* I/O accessors */ -static u32 hw_readl_native(struct macb *bp, int offset) -{ - return __raw_readl(bp->regs + offset); -} - -static void hw_writel_native(struct macb *bp, int offset, u32 value) -{ - __raw_writel(value, bp->regs + offset); -} - -static u32 hw_readl(struct macb *bp, int offset) -{ - return readl_relaxed(bp->regs + offset); -} - -static void hw_writel(struct macb *bp, int offset, u32 value) -{ - writel_relaxed(value, bp->regs + offset); -} - -/* Find the CPU endianness by using the loopback bit of NCR register. When the - * CPU is in big endian we need to program swapped mode for management - * descriptor access. - */ -static bool hw_is_native_io(void __iomem *addr) -{ - u32 value = MACB_BIT(LLB); - - __raw_writel(value, addr + MACB_NCR); - value = __raw_readl(addr + MACB_NCR); - - /* Write 0 back to disable everything */ - __raw_writel(0, addr + MACB_NCR); - - return value == MACB_BIT(LLB); -} - -static bool hw_is_gem(void __iomem *addr, bool native_io) -{ - u32 id; - - if (native_io) - id = __raw_readl(addr + MACB_MID); - else - id = readl_relaxed(addr + MACB_MID); - - return MACB_BFEXT(IDNUM, id) >= 0x2; -} - -static void macb_set_hwaddr(struct macb *bp) -{ - u32 bottom; - u16 top; - - bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr)); - macb_or_gem_writel(bp, SA1B, bottom); - top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4))); - macb_or_gem_writel(bp, SA1T, top); - - /* Clear unused address register sets */ - macb_or_gem_writel(bp, SA2B, 0); - macb_or_gem_writel(bp, SA2T, 0); - macb_or_gem_writel(bp, SA3B, 0); - macb_or_gem_writel(bp, SA3T, 0); - macb_or_gem_writel(bp, SA4B, 0); - macb_or_gem_writel(bp, SA4T, 0); -} - -static void macb_get_hwaddr(struct macb *bp) -{ - struct macb_platform_data *pdata; - u32 bottom; - u16 top; - u8 addr[6]; - int i; - - pdata = dev_get_platdata(&bp->pdev->dev); - - /* Check all 4 address register for valid address */ - for (i = 0; i < 4; i++) { - bottom = macb_or_gem_readl(bp, SA1B + i * 8); - top = macb_or_gem_readl(bp, SA1T + i * 8); - - if (pdata && pdata->rev_eth_addr) { - addr[5] = bottom & 0xff; - addr[4] = (bottom >> 8) & 0xff; - addr[3] = (bottom >> 16) & 0xff; - addr[2] = (bottom >> 24) & 0xff; - addr[1] = top & 0xff; - addr[0] = (top & 0xff00) >> 8; - } else { - addr[0] = bottom & 0xff; - addr[1] = (bottom >> 8) & 0xff; - addr[2] = (bottom >> 16) & 0xff; - addr[3] = (bottom >> 24) & 0xff; - addr[4] = top & 0xff; - addr[5] = (top >> 8) & 0xff; - } - - if (is_valid_ether_addr(addr)) { - memcpy(bp->dev->dev_addr, addr, sizeof(addr)); - return; - } - } - - dev_info(&bp->pdev->dev, "invalid hw address, using random\n"); - eth_hw_addr_random(bp->dev); -} - -static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum) -{ - struct macb *bp = bus->priv; - int value; - - macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF) - | MACB_BF(RW, MACB_MAN_READ) - | MACB_BF(PHYA, mii_id) - | MACB_BF(REGA, regnum) - | MACB_BF(CODE, MACB_MAN_CODE))); - - /* wait for end of transfer */ - while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR))) - cpu_relax(); - - value = MACB_BFEXT(DATA, macb_readl(bp, MAN)); - - return value; -} - -static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum, - u16 value) -{ - struct macb *bp = bus->priv; - - macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF) - | MACB_BF(RW, MACB_MAN_WRITE) - | MACB_BF(PHYA, mii_id) - | MACB_BF(REGA, regnum) - | MACB_BF(CODE, MACB_MAN_CODE) - | MACB_BF(DATA, value))); - - /* wait for end of transfer */ - while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR))) - cpu_relax(); - - return 0; -} - -/** - * macb_set_tx_clk() - Set a clock to a new frequency - * @clk Pointer to the clock to change - * @rate New frequency in Hz - * @dev Pointer to the struct net_device - */ -static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev) -{ - long ferr, rate, rate_rounded; - - if (!clk) - return; - - switch (speed) { - case SPEED_10: - rate = 2500000; - break; - case SPEED_100: - rate = 25000000; - break; - case SPEED_1000: - rate = 125000000; - break; - default: - return; - } - - rate_rounded = clk_round_rate(clk, rate); - if (rate_rounded < 0) - return; - - /* RGMII allows 50 ppm frequency error. Test and warn if this limit - * is not satisfied. - */ - ferr = abs(rate_rounded - rate); - ferr = DIV_ROUND_UP(ferr, rate / 100000); - if (ferr > 5) - netdev_warn(dev, "unable to generate target frequency: %ld Hz\n", - rate); - - if (clk_set_rate(clk, rate_rounded)) - netdev_err(dev, "adjusting tx_clk failed.\n"); -} - -static void macb_handle_link_change(struct net_device *dev) -{ - struct macb *bp = netdev_priv(dev); - struct phy_device *phydev = dev->phydev; - unsigned long flags; - int status_change = 0; - - spin_lock_irqsave(&bp->lock, flags); - - if (phydev->link) { - if ((bp->speed != phydev->speed) || - (bp->duplex != phydev->duplex)) { - u32 reg; - - reg = macb_readl(bp, NCFGR); - reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD)); - if (macb_is_gem(bp)) - reg &= ~GEM_BIT(GBE); - - if (phydev->duplex) - reg |= MACB_BIT(FD); - if (phydev->speed == SPEED_100) - reg |= MACB_BIT(SPD); - if (phydev->speed == SPEED_1000 && - bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) - reg |= GEM_BIT(GBE); - - macb_or_gem_writel(bp, NCFGR, reg); - - bp->speed = phydev->speed; - bp->duplex = phydev->duplex; - status_change = 1; - } - } - - if (phydev->link != bp->link) { - if (!phydev->link) { - bp->speed = 0; - bp->duplex = -1; - } - bp->link = phydev->link; - - status_change = 1; - } - - spin_unlock_irqrestore(&bp->lock, flags); - - if (status_change) { - if (phydev->link) { - /* Update the TX clock rate if and only if the link is - * up and there has been a link change. - */ - macb_set_tx_clk(bp->tx_clk, phydev->speed, dev); - - netif_carrier_on(dev); - netdev_info(dev, "link up (%d/%s)\n", - phydev->speed, - phydev->duplex == DUPLEX_FULL ? - "Full" : "Half"); - } else { - netif_carrier_off(dev); - netdev_info(dev, "link down\n"); - } - } -} - -/* based on au1000_eth. c*/ -static int macb_mii_probe(struct net_device *dev) -{ - struct macb *bp = netdev_priv(dev); - struct macb_platform_data *pdata; - struct phy_device *phydev; - int phy_irq; - int ret; - - if (bp->phy_node) { - phydev = of_phy_connect(dev, bp->phy_node, - &macb_handle_link_change, 0, - bp->phy_interface); - if (!phydev) - return -ENODEV; - } else { - phydev = phy_find_first(bp->mii_bus); - if (!phydev) { - netdev_err(dev, "no PHY found\n"); - return -ENXIO; - } - - pdata = dev_get_platdata(&bp->pdev->dev); - if (pdata) { - if (gpio_is_valid(pdata->phy_irq_pin)) { - ret = devm_gpio_request(&bp->pdev->dev, - pdata->phy_irq_pin, "phy int"); - if (!ret) { - phy_irq = gpio_to_irq(pdata->phy_irq_pin); - phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq; - } - } else { - phydev->irq = PHY_POLL; - } - } - - /* attach the mac to the phy */ - ret = phy_connect_direct(dev, phydev, &macb_handle_link_change, - bp->phy_interface); - if (ret) { - netdev_err(dev, "Could not attach to PHY\n"); - return ret; - } - } - - /* mask with MAC supported features */ - if (macb_is_gem(bp) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) - phydev->supported &= PHY_GBIT_FEATURES; - else - phydev->supported &= PHY_BASIC_FEATURES; - - if (bp->caps & MACB_CAPS_NO_GIGABIT_HALF) - phydev->supported &= ~SUPPORTED_1000baseT_Half; - - phydev->advertising = phydev->supported; - - bp->link = 0; - bp->speed = 0; - bp->duplex = -1; - - return 0; -} - -static int macb_mii_init(struct macb *bp) -{ - struct macb_platform_data *pdata; - struct device_node *np; - int err = -ENXIO, i; - - /* Enable management port */ - macb_writel(bp, NCR, MACB_BIT(MPE)); - - bp->mii_bus = mdiobus_alloc(); - if (!bp->mii_bus) { - err = -ENOMEM; - goto err_out; - } - - bp->mii_bus->name = "MACB_mii_bus"; - bp->mii_bus->read = &macb_mdio_read; - bp->mii_bus->write = &macb_mdio_write; - snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x", - bp->pdev->name, bp->pdev->id); - bp->mii_bus->priv = bp; - bp->mii_bus->parent = &bp->pdev->dev; - pdata = dev_get_platdata(&bp->pdev->dev); - - dev_set_drvdata(&bp->dev->dev, bp->mii_bus); - - np = bp->pdev->dev.of_node; - if (np) { - if (of_phy_is_fixed_link(np)) { - if (of_phy_register_fixed_link(np) < 0) { - dev_err(&bp->pdev->dev, - "broken fixed-link specification\n"); - goto err_out_unregister_bus; - } - bp->phy_node = of_node_get(np); - - err = mdiobus_register(bp->mii_bus); - } else { - /* try dt phy registration */ - err = of_mdiobus_register(bp->mii_bus, np); - - /* fallback to standard phy registration if no phy were - * found during dt phy registration - */ - if (!err && !phy_find_first(bp->mii_bus)) { - for (i = 0; i < PHY_MAX_ADDR; i++) { - struct phy_device *phydev; - - phydev = mdiobus_scan(bp->mii_bus, i); - if (IS_ERR(phydev) && - PTR_ERR(phydev) != -ENODEV) { - err = PTR_ERR(phydev); - break; - } - } - - if (err) - goto err_out_unregister_bus; - } - } - } else { - for (i = 0; i < PHY_MAX_ADDR; i++) - bp->mii_bus->irq[i] = PHY_POLL; - - if (pdata) - bp->mii_bus->phy_mask = pdata->phy_mask; - - err = mdiobus_register(bp->mii_bus); - } - - if (err) - goto err_out_free_mdiobus; - - err = macb_mii_probe(bp->dev); - if (err) - goto err_out_unregister_bus; - - return 0; - -err_out_unregister_bus: - mdiobus_unregister(bp->mii_bus); -err_out_free_mdiobus: - mdiobus_free(bp->mii_bus); -err_out: - return err; -} - -static void macb_update_stats(struct macb *bp) -{ - u32 *p = &bp->hw_stats.macb.rx_pause_frames; - u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1; - int offset = MACB_PFR; - - WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4); - - for (; p < end; p++, offset += 4) - *p += bp->macb_reg_readl(bp, offset); -} - -static int macb_halt_tx(struct macb *bp) -{ - unsigned long halt_time, timeout; - u32 status; - - macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT)); - - timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT); - do { - halt_time = jiffies; - status = macb_readl(bp, TSR); - if (!(status & MACB_BIT(TGO))) - return 0; - - usleep_range(10, 250); - } while (time_before(halt_time, timeout)); - - return -ETIMEDOUT; -} - -static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb) -{ - if (tx_skb->mapping) { - if (tx_skb->mapped_as_page) - dma_unmap_page(&bp->pdev->dev, tx_skb->mapping, - tx_skb->size, DMA_TO_DEVICE); - else - dma_unmap_single(&bp->pdev->dev, tx_skb->mapping, - tx_skb->size, DMA_TO_DEVICE); - tx_skb->mapping = 0; - } - - if (tx_skb->skb) { - dev_kfree_skb_any(tx_skb->skb); - tx_skb->skb = NULL; - } -} - -static void macb_set_addr(struct macb *bp, struct macb_dma_desc *desc, dma_addr_t addr) -{ -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT - struct macb_dma_desc_64 *desc_64; - - if (bp->hw_dma_cap & HW_DMA_CAP_64B) { - desc_64 = macb_64b_desc(bp, desc); - desc_64->addrh = upper_32_bits(addr); - } -#endif - desc->addr = lower_32_bits(addr); -} - -static dma_addr_t macb_get_addr(struct macb *bp, struct macb_dma_desc *desc) -{ - dma_addr_t addr = 0; -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT - struct macb_dma_desc_64 *desc_64; - - if (bp->hw_dma_cap & HW_DMA_CAP_64B) { - desc_64 = macb_64b_desc(bp, desc); - addr = ((u64)(desc_64->addrh) << 32); - } -#endif - addr |= MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr)); - return addr; -} - -static void macb_tx_error_task(struct work_struct *work) -{ - struct macb_queue *queue = container_of(work, struct macb_queue, - tx_error_task); - struct macb *bp = queue->bp; - struct macb_tx_skb *tx_skb; - struct macb_dma_desc *desc; - struct sk_buff *skb; - unsigned int tail; - unsigned long flags; - - netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n", - (unsigned int)(queue - bp->queues), - queue->tx_tail, queue->tx_head); - - /* Prevent the queue IRQ handlers from running: each of them may call - * macb_tx_interrupt(), which in turn may call netif_wake_subqueue(). - * As explained below, we have to halt the transmission before updating - * TBQP registers so we call netif_tx_stop_all_queues() to notify the - * network engine about the macb/gem being halted. - */ - spin_lock_irqsave(&bp->lock, flags); - - /* Make sure nobody is trying to queue up new packets */ - netif_tx_stop_all_queues(bp->dev); - - /* Stop transmission now - * (in case we have just queued new packets) - * macb/gem must be halted to write TBQP register - */ - if (macb_halt_tx(bp)) - /* Just complain for now, reinitializing TX path can be good */ - netdev_err(bp->dev, "BUG: halt tx timed out\n"); - - /* Treat frames in TX queue including the ones that caused the error. - * Free transmit buffers in upper layer. - */ - for (tail = queue->tx_tail; tail != queue->tx_head; tail++) { - u32 ctrl; - - desc = macb_tx_desc(queue, tail); - ctrl = desc->ctrl; - tx_skb = macb_tx_skb(queue, tail); - skb = tx_skb->skb; - - if (ctrl & MACB_BIT(TX_USED)) { - /* skb is set for the last buffer of the frame */ - while (!skb) { - macb_tx_unmap(bp, tx_skb); - tail++; - tx_skb = macb_tx_skb(queue, tail); - skb = tx_skb->skb; - } - - /* ctrl still refers to the first buffer descriptor - * since it's the only one written back by the hardware - */ - if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) { - netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n", - macb_tx_ring_wrap(bp, tail), - skb->data); - bp->dev->stats.tx_packets++; - bp->dev->stats.tx_bytes += skb->len; - } - } else { - /* "Buffers exhausted mid-frame" errors may only happen - * if the driver is buggy, so complain loudly about - * those. Statistics are updated by hardware. - */ - if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED)) - netdev_err(bp->dev, - "BUG: TX buffers exhausted mid-frame\n"); - - desc->ctrl = ctrl | MACB_BIT(TX_USED); - } - - macb_tx_unmap(bp, tx_skb); - } - - /* Set end of TX queue */ - desc = macb_tx_desc(queue, 0); - macb_set_addr(bp, desc, 0); - desc->ctrl = MACB_BIT(TX_USED); - - /* Make descriptor updates visible to hardware */ - wmb(); - - /* Reinitialize the TX desc queue */ - queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma)); -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT - if (bp->hw_dma_cap & HW_DMA_CAP_64B) - queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma)); -#endif - /* Make TX ring reflect state of hardware */ - queue->tx_head = 0; - queue->tx_tail = 0; - - /* Housework before enabling TX IRQ */ - macb_writel(bp, TSR, macb_readl(bp, TSR)); - queue_writel(queue, IER, MACB_TX_INT_FLAGS); - - /* Now we are ready to start transmission again */ - netif_tx_start_all_queues(bp->dev); - macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); - - spin_unlock_irqrestore(&bp->lock, flags); -} - -static void macb_tx_interrupt(struct macb_queue *queue) -{ - unsigned int tail; - unsigned int head; - u32 status; - struct macb *bp = queue->bp; - u16 queue_index = queue - bp->queues; - - status = macb_readl(bp, TSR); - macb_writel(bp, TSR, status); - - if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) - queue_writel(queue, ISR, MACB_BIT(TCOMP)); - - netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n", - (unsigned long)status); - - head = queue->tx_head; - for (tail = queue->tx_tail; tail != head; tail++) { - struct macb_tx_skb *tx_skb; - struct sk_buff *skb; - struct macb_dma_desc *desc; - u32 ctrl; - - desc = macb_tx_desc(queue, tail); - - /* Make hw descriptor updates visible to CPU */ - rmb(); - - ctrl = desc->ctrl; - - /* TX_USED bit is only set by hardware on the very first buffer - * descriptor of the transmitted frame. - */ - if (!(ctrl & MACB_BIT(TX_USED))) - break; - - /* Process all buffers of the current transmitted frame */ - for (;; tail++) { - tx_skb = macb_tx_skb(queue, tail); - skb = tx_skb->skb; - - /* First, update TX stats if needed */ - if (skb) { - netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n", - macb_tx_ring_wrap(bp, tail), - skb->data); - bp->dev->stats.tx_packets++; - bp->dev->stats.tx_bytes += skb->len; - } - - /* Now we can safely release resources */ - macb_tx_unmap(bp, tx_skb); - - /* skb is set only for the last buffer of the frame. - * WARNING: at this point skb has been freed by - * macb_tx_unmap(). - */ - if (skb) - break; - } - } - - queue->tx_tail = tail; - if (__netif_subqueue_stopped(bp->dev, queue_index) && - CIRC_CNT(queue->tx_head, queue->tx_tail, - bp->tx_ring_size) <= MACB_TX_WAKEUP_THRESH(bp)) - netif_wake_subqueue(bp->dev, queue_index); -} - -static void gem_rx_refill(struct macb *bp) -{ - unsigned int entry; - struct sk_buff *skb; - dma_addr_t paddr; - struct macb_dma_desc *desc; - - while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail, - bp->rx_ring_size) > 0) { - entry = macb_rx_ring_wrap(bp, bp->rx_prepared_head); - - /* Make hw descriptor updates visible to CPU */ - rmb(); - - bp->rx_prepared_head++; - desc = macb_rx_desc(bp, entry); - - if (!bp->rx_skbuff[entry]) { - /* allocate sk_buff for this free entry in ring */ - skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size); - if (unlikely(!skb)) { - netdev_err(bp->dev, - "Unable to allocate sk_buff\n"); - break; - } - - /* now fill corresponding descriptor entry */ - paddr = dma_map_single(&bp->pdev->dev, skb->data, - bp->rx_buffer_size, - DMA_FROM_DEVICE); - if (dma_mapping_error(&bp->pdev->dev, paddr)) { - dev_kfree_skb(skb); - break; - } - - bp->rx_skbuff[entry] = skb; - - if (entry == bp->rx_ring_size - 1) - paddr |= MACB_BIT(RX_WRAP); - macb_set_addr(bp, desc, paddr); - desc->ctrl = 0; - - /* properly align Ethernet header */ - skb_reserve(skb, NET_IP_ALIGN); - } else { - desc->addr &= ~MACB_BIT(RX_USED); - desc->ctrl = 0; - } - } - - /* Make descriptor updates visible to hardware */ - wmb(); - - netdev_vdbg(bp->dev, "rx ring: prepared head %d, tail %d\n", - bp->rx_prepared_head, bp->rx_tail); -} - -/* Mark DMA descriptors from begin up to and not including end as unused */ -static void discard_partial_frame(struct macb *bp, unsigned int begin, - unsigned int end) -{ - unsigned int frag; - - for (frag = begin; frag != end; frag++) { - struct macb_dma_desc *desc = macb_rx_desc(bp, frag); - - desc->addr &= ~MACB_BIT(RX_USED); - } - - /* Make descriptor updates visible to hardware */ - wmb(); - - /* When this happens, the hardware stats registers for - * whatever caused this is updated, so we don't have to record - * anything. - */ -} - -static int gem_rx(struct macb *bp, int budget) -{ - unsigned int len; - unsigned int entry; - struct sk_buff *skb; - struct macb_dma_desc *desc; - int count = 0; - - while (count < budget) { - u32 ctrl; - dma_addr_t addr; - bool rxused; - - entry = macb_rx_ring_wrap(bp, bp->rx_tail); - desc = macb_rx_desc(bp, entry); - - /* Make hw descriptor updates visible to CPU */ - rmb(); - - rxused = (desc->addr & MACB_BIT(RX_USED)) ? true : false; - addr = macb_get_addr(bp, desc); - ctrl = desc->ctrl; - - if (!rxused) - break; - - bp->rx_tail++; - count++; - - if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) { - netdev_err(bp->dev, - "not whole frame pointed by descriptor\n"); - bp->dev->stats.rx_dropped++; - break; - } - skb = bp->rx_skbuff[entry]; - if (unlikely(!skb)) { - netdev_err(bp->dev, - "inconsistent Rx descriptor chain\n"); - bp->dev->stats.rx_dropped++; - break; - } - /* now everything is ready for receiving packet */ - bp->rx_skbuff[entry] = NULL; - len = ctrl & bp->rx_frm_len_mask; - - netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len); - - skb_put(skb, len); - dma_unmap_single(&bp->pdev->dev, addr, - bp->rx_buffer_size, DMA_FROM_DEVICE); - - skb->protocol = eth_type_trans(skb, bp->dev); - skb_checksum_none_assert(skb); - if (bp->dev->features & NETIF_F_RXCSUM && - !(bp->dev->flags & IFF_PROMISC) && - GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK) - skb->ip_summed = CHECKSUM_UNNECESSARY; - - bp->dev->stats.rx_packets++; - bp->dev->stats.rx_bytes += skb->len; - -#if defined(DEBUG) && defined(VERBOSE_DEBUG) - netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n", - skb->len, skb->csum); - print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1, - skb_mac_header(skb), 16, true); - print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1, - skb->data, 32, true); -#endif - - netif_receive_skb(skb); - } - - gem_rx_refill(bp); - - return count; -} - -static int macb_rx_frame(struct macb *bp, unsigned int first_frag, - unsigned int last_frag) -{ - unsigned int len; - unsigned int frag; - unsigned int offset; - struct sk_buff *skb; - struct macb_dma_desc *desc; - - desc = macb_rx_desc(bp, last_frag); - len = desc->ctrl & bp->rx_frm_len_mask; - - netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n", - macb_rx_ring_wrap(bp, first_frag), - macb_rx_ring_wrap(bp, last_frag), len); - - /* The ethernet header starts NET_IP_ALIGN bytes into the - * first buffer. Since the header is 14 bytes, this makes the - * payload word-aligned. - * - * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy - * the two padding bytes into the skb so that we avoid hitting - * the slowpath in memcpy(), and pull them off afterwards. - */ - skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN); - if (!skb) { - bp->dev->stats.rx_dropped++; - for (frag = first_frag; ; frag++) { - desc = macb_rx_desc(bp, frag); - desc->addr &= ~MACB_BIT(RX_USED); - if (frag == last_frag) - break; - } - - /* Make descriptor updates visible to hardware */ - wmb(); - - return 1; - } - - offset = 0; - len += NET_IP_ALIGN; - skb_checksum_none_assert(skb); - skb_put(skb, len); - - for (frag = first_frag; ; frag++) { - unsigned int frag_len = bp->rx_buffer_size; - - if (offset + frag_len > len) { - if (unlikely(frag != last_frag)) { - dev_kfree_skb_any(skb); - return -1; - } - frag_len = len - offset; - } - skb_copy_to_linear_data_offset(skb, offset, - macb_rx_buffer(bp, frag), - frag_len); - offset += bp->rx_buffer_size; - desc = macb_rx_desc(bp, frag); - desc->addr &= ~MACB_BIT(RX_USED); - - if (frag == last_frag) - break; - } - - /* Make descriptor updates visible to hardware */ - wmb(); - - __skb_pull(skb, NET_IP_ALIGN); - skb->protocol = eth_type_trans(skb, bp->dev); - - bp->dev->stats.rx_packets++; - bp->dev->stats.rx_bytes += skb->len; - netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n", - skb->len, skb->csum); - netif_receive_skb(skb); - - return 0; -} - -static inline void macb_init_rx_ring(struct macb *bp) -{ - dma_addr_t addr; - struct macb_dma_desc *desc = NULL; - int i; - - addr = bp->rx_buffers_dma; - for (i = 0; i < bp->rx_ring_size; i++) { - desc = macb_rx_desc(bp, i); - macb_set_addr(bp, desc, addr); - desc->ctrl = 0; - addr += bp->rx_buffer_size; - } - desc->addr |= MACB_BIT(RX_WRAP); - bp->rx_tail = 0; -} - -static int macb_rx(struct macb *bp, int budget) -{ - bool reset_rx_queue = false; - int received = 0; - unsigned int tail; - int first_frag = -1; - - for (tail = bp->rx_tail; budget > 0; tail++) { - struct macb_dma_desc *desc = macb_rx_desc(bp, tail); - u32 ctrl; - - /* Make hw descriptor updates visible to CPU */ - rmb(); - - ctrl = desc->ctrl; - - if (!(desc->addr & MACB_BIT(RX_USED))) - break; - - if (ctrl & MACB_BIT(RX_SOF)) { - if (first_frag != -1) - discard_partial_frame(bp, first_frag, tail); - first_frag = tail; - } - - if (ctrl & MACB_BIT(RX_EOF)) { - int dropped; - - if (unlikely(first_frag == -1)) { - reset_rx_queue = true; - continue; - } - - dropped = macb_rx_frame(bp, first_frag, tail); - first_frag = -1; - if (unlikely(dropped < 0)) { - reset_rx_queue = true; - continue; - } - if (!dropped) { - received++; - budget--; - } - } - } - - if (unlikely(reset_rx_queue)) { - unsigned long flags; - u32 ctrl; - - netdev_err(bp->dev, "RX queue corruption: reset it\n"); - - spin_lock_irqsave(&bp->lock, flags); - - ctrl = macb_readl(bp, NCR); - macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE)); - - macb_init_rx_ring(bp); - macb_writel(bp, RBQP, bp->rx_ring_dma); - - macb_writel(bp, NCR, ctrl | MACB_BIT(RE)); - - spin_unlock_irqrestore(&bp->lock, flags); - return received; - } - - if (first_frag != -1) - bp->rx_tail = first_frag; - else - bp->rx_tail = tail; - - return received; -} - -static int macb_poll(struct napi_struct *napi, int budget) -{ - struct macb *bp = container_of(napi, struct macb, napi); - int work_done; - u32 status; - - status = macb_readl(bp, RSR); - macb_writel(bp, RSR, status); - - work_done = 0; - - netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n", - (unsigned long)status, budget); - - work_done = bp->macbgem_ops.mog_rx(bp, budget); - if (work_done < budget) { - napi_complete_done(napi, work_done); - - /* Packets received while interrupts were disabled */ - status = macb_readl(bp, RSR); - if (status) { - if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) - macb_writel(bp, ISR, MACB_BIT(RCOMP)); - napi_reschedule(napi); - } else { - macb_writel(bp, IER, MACB_RX_INT_FLAGS); - } - } - - /* TODO: Handle errors */ - - return work_done; -} - -static irqreturn_t macb_interrupt(int irq, void *dev_id) -{ - struct macb_queue *queue = dev_id; - struct macb *bp = queue->bp; - struct net_device *dev = bp->dev; - u32 status, ctrl; - - status = queue_readl(queue, ISR); - - if (unlikely(!status)) - return IRQ_NONE; - - spin_lock(&bp->lock); - - while (status) { - /* close possible race with dev_close */ - if (unlikely(!netif_running(dev))) { - queue_writel(queue, IDR, -1); - if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) - queue_writel(queue, ISR, -1); - break; - } - - netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n", - (unsigned int)(queue - bp->queues), - (unsigned long)status); - - if (status & MACB_RX_INT_FLAGS) { - /* There's no point taking any more interrupts - * until we have processed the buffers. The - * scheduling call may fail if the poll routine - * is already scheduled, so disable interrupts - * now. - */ - queue_writel(queue, IDR, MACB_RX_INT_FLAGS); - if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) - queue_writel(queue, ISR, MACB_BIT(RCOMP)); - - if (napi_schedule_prep(&bp->napi)) { - netdev_vdbg(bp->dev, "scheduling RX softirq\n"); - __napi_schedule(&bp->napi); - } - } - - if (unlikely(status & (MACB_TX_ERR_FLAGS))) { - queue_writel(queue, IDR, MACB_TX_INT_FLAGS); - schedule_work(&queue->tx_error_task); - - if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) - queue_writel(queue, ISR, MACB_TX_ERR_FLAGS); - - break; - } - - if (status & MACB_BIT(TCOMP)) - macb_tx_interrupt(queue); - - /* Link change detection isn't possible with RMII, so we'll - * add that if/when we get our hands on a full-blown MII PHY. - */ - - /* There is a hardware issue under heavy load where DMA can - * stop, this causes endless "used buffer descriptor read" - * interrupts but it can be cleared by re-enabling RX. See - * the at91 manual, section 41.3.1 or the Zynq manual - * section 16.7.4 for details. - */ - if (status & MACB_BIT(RXUBR)) { - ctrl = macb_readl(bp, NCR); - macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE)); - wmb(); - macb_writel(bp, NCR, ctrl | MACB_BIT(RE)); - - if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) - queue_writel(queue, ISR, MACB_BIT(RXUBR)); - } - - if (status & MACB_BIT(ISR_ROVR)) { - /* We missed at least one packet */ - if (macb_is_gem(bp)) - bp->hw_stats.gem.rx_overruns++; - else - bp->hw_stats.macb.rx_overruns++; - - if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) - queue_writel(queue, ISR, MACB_BIT(ISR_ROVR)); - } - - if (status & MACB_BIT(HRESP)) { - /* TODO: Reset the hardware, and maybe move the - * netdev_err to a lower-priority context as well - * (work queue?) - */ - netdev_err(dev, "DMA bus error: HRESP not OK\n"); - - if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) - queue_writel(queue, ISR, MACB_BIT(HRESP)); - } - - status = queue_readl(queue, ISR); - } - - spin_unlock(&bp->lock); - - return IRQ_HANDLED; -} - -#ifdef CONFIG_NET_POLL_CONTROLLER -/* Polling receive - used by netconsole and other diagnostic tools - * to allow network i/o with interrupts disabled. - */ -static void macb_poll_controller(struct net_device *dev) -{ - struct macb *bp = netdev_priv(dev); - struct macb_queue *queue; - unsigned long flags; - unsigned int q; - - local_irq_save(flags); - for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) - macb_interrupt(dev->irq, queue); - local_irq_restore(flags); -} -#endif - -static unsigned int macb_tx_map(struct macb *bp, - struct macb_queue *queue, - struct sk_buff *skb, - unsigned int hdrlen) -{ - dma_addr_t mapping; - unsigned int len, entry, i, tx_head = queue->tx_head; - struct macb_tx_skb *tx_skb = NULL; - struct macb_dma_desc *desc; - unsigned int offset, size, count = 0; - unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags; - unsigned int eof = 1, mss_mfs = 0; - u32 ctrl, lso_ctrl = 0, seq_ctrl = 0; - - /* LSO */ - if (skb_shinfo(skb)->gso_size != 0) { - if (ip_hdr(skb)->protocol == IPPROTO_UDP) - /* UDP - UFO */ - lso_ctrl = MACB_LSO_UFO_ENABLE; - else - /* TCP - TSO */ - lso_ctrl = MACB_LSO_TSO_ENABLE; - } - - /* First, map non-paged data */ - len = skb_headlen(skb); - - /* first buffer length */ - size = hdrlen; - - offset = 0; - while (len) { - entry = macb_tx_ring_wrap(bp, tx_head); - tx_skb = &queue->tx_skb[entry]; - - mapping = dma_map_single(&bp->pdev->dev, - skb->data + offset, - size, DMA_TO_DEVICE); - if (dma_mapping_error(&bp->pdev->dev, mapping)) - goto dma_error; - - /* Save info to properly release resources */ - tx_skb->skb = NULL; - tx_skb->mapping = mapping; - tx_skb->size = size; - tx_skb->mapped_as_page = false; - - len -= size; - offset += size; - count++; - tx_head++; - - size = min(len, bp->max_tx_length); - } - - /* Then, map paged data from fragments */ - for (f = 0; f < nr_frags; f++) { - const skb_frag_t *frag = &skb_shinfo(skb)->frags[f]; - - len = skb_frag_size(frag); - offset = 0; - while (len) { - size = min(len, bp->max_tx_length); - entry = macb_tx_ring_wrap(bp, tx_head); - tx_skb = &queue->tx_skb[entry]; - - mapping = skb_frag_dma_map(&bp->pdev->dev, frag, - offset, size, DMA_TO_DEVICE); - if (dma_mapping_error(&bp->pdev->dev, mapping)) - goto dma_error; - - /* Save info to properly release resources */ - tx_skb->skb = NULL; - tx_skb->mapping = mapping; - tx_skb->size = size; - tx_skb->mapped_as_page = true; - - len -= size; - offset += size; - count++; - tx_head++; - } - } - - /* Should never happen */ - if (unlikely(!tx_skb)) { - netdev_err(bp->dev, "BUG! empty skb!\n"); - return 0; - } - - /* This is the last buffer of the frame: save socket buffer */ - tx_skb->skb = skb; - - /* Update TX ring: update buffer descriptors in reverse order - * to avoid race condition - */ - - /* Set 'TX_USED' bit in buffer descriptor at tx_head position - * to set the end of TX queue - */ - i = tx_head; - entry = macb_tx_ring_wrap(bp, i); - ctrl = MACB_BIT(TX_USED); - desc = macb_tx_desc(queue, entry); - desc->ctrl = ctrl; - - if (lso_ctrl) { - if (lso_ctrl == MACB_LSO_UFO_ENABLE) - /* include header and FCS in value given to h/w */ - mss_mfs = skb_shinfo(skb)->gso_size + - skb_transport_offset(skb) + - ETH_FCS_LEN; - else /* TSO */ { - mss_mfs = skb_shinfo(skb)->gso_size; - /* TCP Sequence Number Source Select - * can be set only for TSO - */ - seq_ctrl = 0; - } - } - - do { - i--; - entry = macb_tx_ring_wrap(bp, i); - tx_skb = &queue->tx_skb[entry]; - desc = macb_tx_desc(queue, entry); - - ctrl = (u32)tx_skb->size; - if (eof) { - ctrl |= MACB_BIT(TX_LAST); - eof = 0; - } - if (unlikely(entry == (bp->tx_ring_size - 1))) - ctrl |= MACB_BIT(TX_WRAP); - - /* First descriptor is header descriptor */ - if (i == queue->tx_head) { - ctrl |= MACB_BF(TX_LSO, lso_ctrl); - ctrl |= MACB_BF(TX_TCP_SEQ_SRC, seq_ctrl); - } else - /* Only set MSS/MFS on payload descriptors - * (second or later descriptor) - */ - ctrl |= MACB_BF(MSS_MFS, mss_mfs); - - /* Set TX buffer descriptor */ - macb_set_addr(bp, desc, tx_skb->mapping); - /* desc->addr must be visible to hardware before clearing - * 'TX_USED' bit in desc->ctrl. - */ - wmb(); - desc->ctrl = ctrl; - } while (i != queue->tx_head); - - queue->tx_head = tx_head; - - return count; - -dma_error: - netdev_err(bp->dev, "TX DMA map failed\n"); - - for (i = queue->tx_head; i != tx_head; i++) { - tx_skb = macb_tx_skb(queue, i); - - macb_tx_unmap(bp, tx_skb); - } - - return 0; -} - -static netdev_features_t macb_features_check(struct sk_buff *skb, - struct net_device *dev, - netdev_features_t features) -{ - unsigned int nr_frags, f; - unsigned int hdrlen; - - /* Validate LSO compatibility */ - - /* there is only one buffer */ - if (!skb_is_nonlinear(skb)) - return features; - - /* length of header */ - hdrlen = skb_transport_offset(skb); - if (ip_hdr(skb)->protocol == IPPROTO_TCP) - hdrlen += tcp_hdrlen(skb); - - /* For LSO: - * When software supplies two or more payload buffers all payload buffers - * apart from the last must be a multiple of 8 bytes in size. - */ - if (!IS_ALIGNED(skb_headlen(skb) - hdrlen, MACB_TX_LEN_ALIGN)) - return features & ~MACB_NETIF_LSO; - - nr_frags = skb_shinfo(skb)->nr_frags; - /* No need to check last fragment */ - nr_frags--; - for (f = 0; f < nr_frags; f++) { - const skb_frag_t *frag = &skb_shinfo(skb)->frags[f]; - - if (!IS_ALIGNED(skb_frag_size(frag), MACB_TX_LEN_ALIGN)) - return features & ~MACB_NETIF_LSO; - } - return features; -} - -static inline int macb_clear_csum(struct sk_buff *skb) -{ - /* no change for packets without checksum offloading */ - if (skb->ip_summed != CHECKSUM_PARTIAL) - return 0; - - /* make sure we can modify the header */ - if (unlikely(skb_cow_head(skb, 0))) - return -1; - - /* initialize checksum field - * This is required - at least for Zynq, which otherwise calculates - * wrong UDP header checksums for UDP packets with UDP data len <=2 - */ - *(__sum16 *)(skb_checksum_start(skb) + skb->csum_offset) = 0; - return 0; -} - -static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev) -{ - u16 queue_index = skb_get_queue_mapping(skb); - struct macb *bp = netdev_priv(dev); - struct macb_queue *queue = &bp->queues[queue_index]; - unsigned long flags; - unsigned int desc_cnt, nr_frags, frag_size, f; - unsigned int hdrlen; - bool is_lso, is_udp = 0; - - is_lso = (skb_shinfo(skb)->gso_size != 0); - - if (is_lso) { - is_udp = !!(ip_hdr(skb)->protocol == IPPROTO_UDP); - - /* length of headers */ - if (is_udp) - /* only queue eth + ip headers separately for UDP */ - hdrlen = skb_transport_offset(skb); - else - hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb); - if (skb_headlen(skb) < hdrlen) { - netdev_err(bp->dev, "Error - LSO headers fragmented!!!\n"); - /* if this is required, would need to copy to single buffer */ - return NETDEV_TX_BUSY; - } - } else - hdrlen = min(skb_headlen(skb), bp->max_tx_length); - -#if defined(DEBUG) && defined(VERBOSE_DEBUG) - netdev_vdbg(bp->dev, - "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n", - queue_index, skb->len, skb->head, skb->data, - skb_tail_pointer(skb), skb_end_pointer(skb)); - print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1, - skb->data, 16, true); -#endif - - /* Count how many TX buffer descriptors are needed to send this - * socket buffer: skb fragments of jumbo frames may need to be - * split into many buffer descriptors. - */ - if (is_lso && (skb_headlen(skb) > hdrlen)) - /* extra header descriptor if also payload in first buffer */ - desc_cnt = DIV_ROUND_UP((skb_headlen(skb) - hdrlen), bp->max_tx_length) + 1; - else - desc_cnt = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length); - nr_frags = skb_shinfo(skb)->nr_frags; - for (f = 0; f < nr_frags; f++) { - frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]); - desc_cnt += DIV_ROUND_UP(frag_size, bp->max_tx_length); - } - - spin_lock_irqsave(&bp->lock, flags); - - /* This is a hard error, log it. */ - if (CIRC_SPACE(queue->tx_head, queue->tx_tail, - bp->tx_ring_size) < desc_cnt) { - netif_stop_subqueue(dev, queue_index); - spin_unlock_irqrestore(&bp->lock, flags); - netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n", - queue->tx_head, queue->tx_tail); - return NETDEV_TX_BUSY; - } - - if (macb_clear_csum(skb)) { - dev_kfree_skb_any(skb); - goto unlock; - } - - /* Map socket buffer for DMA transfer */ - if (!macb_tx_map(bp, queue, skb, hdrlen)) { - dev_kfree_skb_any(skb); - goto unlock; - } - - /* Make newly initialized descriptor visible to hardware */ - wmb(); - - skb_tx_timestamp(skb); - - macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); - - if (CIRC_SPACE(queue->tx_head, queue->tx_tail, bp->tx_ring_size) < 1) - netif_stop_subqueue(dev, queue_index); - -unlock: - spin_unlock_irqrestore(&bp->lock, flags); - - return NETDEV_TX_OK; -} - -static void macb_init_rx_buffer_size(struct macb *bp, size_t size) -{ - if (!macb_is_gem(bp)) { - bp->rx_buffer_size = MACB_RX_BUFFER_SIZE; - } else { - bp->rx_buffer_size = size; - - if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) { - netdev_dbg(bp->dev, - "RX buffer must be multiple of %d bytes, expanding\n", - RX_BUFFER_MULTIPLE); - bp->rx_buffer_size = - roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE); - } - } - - netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%zu]\n", - bp->dev->mtu, bp->rx_buffer_size); -} - -static void gem_free_rx_buffers(struct macb *bp) -{ - struct sk_buff *skb; - struct macb_dma_desc *desc; - dma_addr_t addr; - int i; - - if (!bp->rx_skbuff) - return; - - for (i = 0; i < bp->rx_ring_size; i++) { - skb = bp->rx_skbuff[i]; - - if (!skb) - continue; - - desc = macb_rx_desc(bp, i); - addr = macb_get_addr(bp, desc); - - dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size, - DMA_FROM_DEVICE); - dev_kfree_skb_any(skb); - skb = NULL; - } - - kfree(bp->rx_skbuff); - bp->rx_skbuff = NULL; -} - -static void macb_free_rx_buffers(struct macb *bp) -{ - if (bp->rx_buffers) { - dma_free_coherent(&bp->pdev->dev, - bp->rx_ring_size * bp->rx_buffer_size, - bp->rx_buffers, bp->rx_buffers_dma); - bp->rx_buffers = NULL; - } -} - -static void macb_free_consistent(struct macb *bp) -{ - struct macb_queue *queue; - unsigned int q; - - bp->macbgem_ops.mog_free_rx_buffers(bp); - if (bp->rx_ring) { - dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES(bp), - bp->rx_ring, bp->rx_ring_dma); - bp->rx_ring = NULL; - } - - for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { - kfree(queue->tx_skb); - queue->tx_skb = NULL; - if (queue->tx_ring) { - dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES(bp), - queue->tx_ring, queue->tx_ring_dma); - queue->tx_ring = NULL; - } - } -} - -static int gem_alloc_rx_buffers(struct macb *bp) -{ - int size; - - size = bp->rx_ring_size * sizeof(struct sk_buff *); - bp->rx_skbuff = kzalloc(size, GFP_KERNEL); - if (!bp->rx_skbuff) - return -ENOMEM; - else - netdev_dbg(bp->dev, - "Allocated %d RX struct sk_buff entries at %p\n", - bp->rx_ring_size, bp->rx_skbuff); - return 0; -} - -static int macb_alloc_rx_buffers(struct macb *bp) -{ - int size; - - size = bp->rx_ring_size * bp->rx_buffer_size; - bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size, - &bp->rx_buffers_dma, GFP_KERNEL); - if (!bp->rx_buffers) - return -ENOMEM; - - netdev_dbg(bp->dev, - "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n", - size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers); - return 0; -} - -static int macb_alloc_consistent(struct macb *bp) -{ - struct macb_queue *queue; - unsigned int q; - int size; - - for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { - size = TX_RING_BYTES(bp); - queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size, - &queue->tx_ring_dma, - GFP_KERNEL); - if (!queue->tx_ring) - goto out_err; - netdev_dbg(bp->dev, - "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n", - q, size, (unsigned long)queue->tx_ring_dma, - queue->tx_ring); - - size = bp->tx_ring_size * sizeof(struct macb_tx_skb); - queue->tx_skb = kmalloc(size, GFP_KERNEL); - if (!queue->tx_skb) - goto out_err; - } - - size = RX_RING_BYTES(bp); - bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size, - &bp->rx_ring_dma, GFP_KERNEL); - if (!bp->rx_ring) - goto out_err; - netdev_dbg(bp->dev, - "Allocated RX ring of %d bytes at %08lx (mapped %p)\n", - size, (unsigned long)bp->rx_ring_dma, bp->rx_ring); - - if (bp->macbgem_ops.mog_alloc_rx_buffers(bp)) - goto out_err; - - return 0; - -out_err: - macb_free_consistent(bp); - return -ENOMEM; -} - -static void gem_init_rings(struct macb *bp) -{ - struct macb_queue *queue; - struct macb_dma_desc *desc = NULL; - unsigned int q; - int i; - - for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { - for (i = 0; i < bp->tx_ring_size; i++) { - desc = macb_tx_desc(queue, i); - macb_set_addr(bp, desc, 0); - desc->ctrl = MACB_BIT(TX_USED); - } - desc->ctrl |= MACB_BIT(TX_WRAP); - queue->tx_head = 0; - queue->tx_tail = 0; - } - - bp->rx_tail = 0; - bp->rx_prepared_head = 0; - - gem_rx_refill(bp); -} - -static void macb_init_rings(struct macb *bp) -{ - int i; - struct macb_dma_desc *desc = NULL; - - macb_init_rx_ring(bp); - - for (i = 0; i < bp->tx_ring_size; i++) { - desc = macb_tx_desc(&bp->queues[0], i); - macb_set_addr(bp, desc, 0); - desc->ctrl = MACB_BIT(TX_USED); - } - bp->queues[0].tx_head = 0; - bp->queues[0].tx_tail = 0; - desc->ctrl |= MACB_BIT(TX_WRAP); -} - -static void macb_reset_hw(struct macb *bp) -{ - struct macb_queue *queue; - unsigned int q; - - /* Disable RX and TX (XXX: Should we halt the transmission - * more gracefully?) - */ - macb_writel(bp, NCR, 0); - - /* Clear the stats registers (XXX: Update stats first?) */ - macb_writel(bp, NCR, MACB_BIT(CLRSTAT)); - - /* Clear all status flags */ - macb_writel(bp, TSR, -1); - macb_writel(bp, RSR, -1); - - /* Disable all interrupts */ - for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { - queue_writel(queue, IDR, -1); - queue_readl(queue, ISR); - if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) - queue_writel(queue, ISR, -1); - } -} - -static u32 gem_mdc_clk_div(struct macb *bp) -{ - u32 config; - unsigned long pclk_hz = clk_get_rate(bp->pclk); - - if (pclk_hz <= 20000000) - config = GEM_BF(CLK, GEM_CLK_DIV8); - else if (pclk_hz <= 40000000) - config = GEM_BF(CLK, GEM_CLK_DIV16); - else if (pclk_hz <= 80000000) - config = GEM_BF(CLK, GEM_CLK_DIV32); - else if (pclk_hz <= 120000000) - config = GEM_BF(CLK, GEM_CLK_DIV48); - else if (pclk_hz <= 160000000) - config = GEM_BF(CLK, GEM_CLK_DIV64); - else - config = GEM_BF(CLK, GEM_CLK_DIV96); - - return config; -} - -static u32 macb_mdc_clk_div(struct macb *bp) -{ - u32 config; - unsigned long pclk_hz; - - if (macb_is_gem(bp)) - return gem_mdc_clk_div(bp); - - pclk_hz = clk_get_rate(bp->pclk); - if (pclk_hz <= 20000000) - config = MACB_BF(CLK, MACB_CLK_DIV8); - else if (pclk_hz <= 40000000) - config = MACB_BF(CLK, MACB_CLK_DIV16); - else if (pclk_hz <= 80000000) - config = MACB_BF(CLK, MACB_CLK_DIV32); - else - config = MACB_BF(CLK, MACB_CLK_DIV64); - - return config; -} - -/* Get the DMA bus width field of the network configuration register that we - * should program. We find the width from decoding the design configuration - * register to find the maximum supported data bus width. - */ -static u32 macb_dbw(struct macb *bp) -{ - if (!macb_is_gem(bp)) - return 0; - - switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) { - case 4: - return GEM_BF(DBW, GEM_DBW128); - case 2: - return GEM_BF(DBW, GEM_DBW64); - case 1: - default: - return GEM_BF(DBW, GEM_DBW32); - } -} - -/* Configure the receive DMA engine - * - use the correct receive buffer size - * - set best burst length for DMA operations - * (if not supported by FIFO, it will fallback to default) - * - set both rx/tx packet buffers to full memory size - * These are configurable parameters for GEM. - */ -static void macb_configure_dma(struct macb *bp) -{ - u32 dmacfg; - - if (macb_is_gem(bp)) { - dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L); - dmacfg |= GEM_BF(RXBS, bp->rx_buffer_size / RX_BUFFER_MULTIPLE); - if (bp->dma_burst_length) - dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg); - dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L); - dmacfg &= ~GEM_BIT(ENDIA_PKT); - - if (bp->native_io) - dmacfg &= ~GEM_BIT(ENDIA_DESC); - else - dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */ - - if (bp->dev->features & NETIF_F_HW_CSUM) - dmacfg |= GEM_BIT(TXCOEN); - else - dmacfg &= ~GEM_BIT(TXCOEN); - -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT - if (bp->hw_dma_cap & HW_DMA_CAP_64B) - dmacfg |= GEM_BIT(ADDR64); -#endif -#ifdef CONFIG_MACB_USE_HWSTAMP - if (bp->hw_dma_cap & HW_DMA_CAP_PTP) - dmacfg |= GEM_BIT(RXEXT) | GEM_BIT(TXEXT); -#endif - netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n", - dmacfg); - gem_writel(bp, DMACFG, dmacfg); - } -} - -static void macb_init_hw(struct macb *bp) -{ - struct macb_queue *queue; - unsigned int q; - - u32 config; - - macb_reset_hw(bp); - macb_set_hwaddr(bp); - - config = macb_mdc_clk_div(bp); - if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) - config |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL); - config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */ - config |= MACB_BIT(PAE); /* PAuse Enable */ - config |= MACB_BIT(DRFCS); /* Discard Rx FCS */ - if (bp->caps & MACB_CAPS_JUMBO) - config |= MACB_BIT(JFRAME); /* Enable jumbo frames */ - else - config |= MACB_BIT(BIG); /* Receive oversized frames */ - if (bp->dev->flags & IFF_PROMISC) - config |= MACB_BIT(CAF); /* Copy All Frames */ - else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM) - config |= GEM_BIT(RXCOEN); - if (!(bp->dev->flags & IFF_BROADCAST)) - config |= MACB_BIT(NBC); /* No BroadCast */ - config |= macb_dbw(bp); - macb_writel(bp, NCFGR, config); - if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len) - gem_writel(bp, JML, bp->jumbo_max_len); - bp->speed = SPEED_10; - bp->duplex = DUPLEX_HALF; - bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK; - if (bp->caps & MACB_CAPS_JUMBO) - bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK; - - macb_configure_dma(bp); - - /* Initialize TX and RX buffers */ - macb_writel(bp, RBQP, lower_32_bits(bp->rx_ring_dma)); -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT - if (bp->hw_dma_cap & HW_DMA_CAP_64B) - macb_writel(bp, RBQPH, upper_32_bits(bp->rx_ring_dma)); -#endif - for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { - queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma)); -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT - if (bp->hw_dma_cap & HW_DMA_CAP_64B) - queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma)); -#endif - - /* Enable interrupts */ - queue_writel(queue, IER, - MACB_RX_INT_FLAGS | - MACB_TX_INT_FLAGS | - MACB_BIT(HRESP)); - } - - /* Enable TX and RX */ - macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE)); -} - -/* The hash address register is 64 bits long and takes up two - * locations in the memory map. The least significant bits are stored - * in EMAC_HSL and the most significant bits in EMAC_HSH. - * - * The unicast hash enable and the multicast hash enable bits in the - * network configuration register enable the reception of hash matched - * frames. The destination address is reduced to a 6 bit index into - * the 64 bit hash register using the following hash function. The - * hash function is an exclusive or of every sixth bit of the - * destination address. - * - * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47] - * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46] - * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45] - * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44] - * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43] - * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42] - * - * da[0] represents the least significant bit of the first byte - * received, that is, the multicast/unicast indicator, and da[47] - * represents the most significant bit of the last byte received. If - * the hash index, hi[n], points to a bit that is set in the hash - * register then the frame will be matched according to whether the - * frame is multicast or unicast. A multicast match will be signalled - * if the multicast hash enable bit is set, da[0] is 1 and the hash - * index points to a bit set in the hash register. A unicast match - * will be signalled if the unicast hash enable bit is set, da[0] is 0 - * and the hash index points to a bit set in the hash register. To - * receive all multicast frames, the hash register should be set with - * all ones and the multicast hash enable bit should be set in the - * network configuration register. - */ - -static inline int hash_bit_value(int bitnr, __u8 *addr) -{ - if (addr[bitnr / 8] & (1 << (bitnr % 8))) - return 1; - return 0; -} - -/* Return the hash index value for the specified address. */ -static int hash_get_index(__u8 *addr) -{ - int i, j, bitval; - int hash_index = 0; - - for (j = 0; j < 6; j++) { - for (i = 0, bitval = 0; i < 8; i++) - bitval ^= hash_bit_value(i * 6 + j, addr); - - hash_index |= (bitval << j); - } - - return hash_index; -} - -/* Add multicast addresses to the internal multicast-hash table. */ -static void macb_sethashtable(struct net_device *dev) -{ - struct netdev_hw_addr *ha; - unsigned long mc_filter[2]; - unsigned int bitnr; - struct macb *bp = netdev_priv(dev); - - mc_filter[0] = 0; - mc_filter[1] = 0; - - netdev_for_each_mc_addr(ha, dev) { - bitnr = hash_get_index(ha->addr); - mc_filter[bitnr >> 5] |= 1 << (bitnr & 31); - } - - macb_or_gem_writel(bp, HRB, mc_filter[0]); - macb_or_gem_writel(bp, HRT, mc_filter[1]); -} - -/* Enable/Disable promiscuous and multicast modes. */ -static void macb_set_rx_mode(struct net_device *dev) -{ - unsigned long cfg; - struct macb *bp = netdev_priv(dev); - - cfg = macb_readl(bp, NCFGR); - - if (dev->flags & IFF_PROMISC) { - /* Enable promiscuous mode */ - cfg |= MACB_BIT(CAF); - - /* Disable RX checksum offload */ - if (macb_is_gem(bp)) - cfg &= ~GEM_BIT(RXCOEN); - } else { - /* Disable promiscuous mode */ - cfg &= ~MACB_BIT(CAF); - - /* Enable RX checksum offload only if requested */ - if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM) - cfg |= GEM_BIT(RXCOEN); - } - - if (dev->flags & IFF_ALLMULTI) { - /* Enable all multicast mode */ - macb_or_gem_writel(bp, HRB, -1); - macb_or_gem_writel(bp, HRT, -1); - cfg |= MACB_BIT(NCFGR_MTI); - } else if (!netdev_mc_empty(dev)) { - /* Enable specific multicasts */ - macb_sethashtable(dev); - cfg |= MACB_BIT(NCFGR_MTI); - } else if (dev->flags & (~IFF_ALLMULTI)) { - /* Disable all multicast mode */ - macb_or_gem_writel(bp, HRB, 0); - macb_or_gem_writel(bp, HRT, 0); - cfg &= ~MACB_BIT(NCFGR_MTI); - } - - macb_writel(bp, NCFGR, cfg); -} - -static int macb_open(struct net_device *dev) -{ - struct macb *bp = netdev_priv(dev); - size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN; - int err; - - netdev_dbg(bp->dev, "open\n"); - - /* carrier starts down */ - netif_carrier_off(dev); - - /* if the phy is not yet register, retry later*/ - if (!dev->phydev) - return -EAGAIN; - - /* RX buffers initialization */ - macb_init_rx_buffer_size(bp, bufsz); - - err = macb_alloc_consistent(bp); - if (err) { - netdev_err(dev, "Unable to allocate DMA memory (error %d)\n", - err); - return err; - } - - napi_enable(&bp->napi); - - bp->macbgem_ops.mog_init_rings(bp); - macb_init_hw(bp); - - /* schedule a link state check */ - phy_start(dev->phydev); - - netif_tx_start_all_queues(dev); - - if (bp->ptp_info) - bp->ptp_info->ptp_init(dev); - - return 0; -} - -static int macb_close(struct net_device *dev) -{ - struct macb *bp = netdev_priv(dev); - unsigned long flags; - - netif_tx_stop_all_queues(dev); - napi_disable(&bp->napi); - - if (dev->phydev) - phy_stop(dev->phydev); - - spin_lock_irqsave(&bp->lock, flags); - macb_reset_hw(bp); - netif_carrier_off(dev); - spin_unlock_irqrestore(&bp->lock, flags); - - macb_free_consistent(bp); - - if (bp->ptp_info) - bp->ptp_info->ptp_remove(dev); - - return 0; -} - -static int macb_change_mtu(struct net_device *dev, int new_mtu) -{ - if (netif_running(dev)) - return -EBUSY; - - dev->mtu = new_mtu; - - return 0; -} - -static void gem_update_stats(struct macb *bp) -{ - unsigned int i; - u32 *p = &bp->hw_stats.gem.tx_octets_31_0; - - for (i = 0; i < GEM_STATS_LEN; ++i, ++p) { - u32 offset = gem_statistics[i].offset; - u64 val = bp->macb_reg_readl(bp, offset); - - bp->ethtool_stats[i] += val; - *p += val; - - if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) { - /* Add GEM_OCTTXH, GEM_OCTRXH */ - val = bp->macb_reg_readl(bp, offset + 4); - bp->ethtool_stats[i] += ((u64)val) << 32; - *(++p) += val; - } - } -} - -static struct net_device_stats *gem_get_stats(struct macb *bp) -{ - struct gem_stats *hwstat = &bp->hw_stats.gem; - struct net_device_stats *nstat = &bp->dev->stats; - - gem_update_stats(bp); - - nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors + - hwstat->rx_alignment_errors + - hwstat->rx_resource_errors + - hwstat->rx_overruns + - hwstat->rx_oversize_frames + - hwstat->rx_jabbers + - hwstat->rx_undersized_frames + - hwstat->rx_length_field_frame_errors); - nstat->tx_errors = (hwstat->tx_late_collisions + - hwstat->tx_excessive_collisions + - hwstat->tx_underrun + - hwstat->tx_carrier_sense_errors); - nstat->multicast = hwstat->rx_multicast_frames; - nstat->collisions = (hwstat->tx_single_collision_frames + - hwstat->tx_multiple_collision_frames + - hwstat->tx_excessive_collisions); - nstat->rx_length_errors = (hwstat->rx_oversize_frames + - hwstat->rx_jabbers + - hwstat->rx_undersized_frames + - hwstat->rx_length_field_frame_errors); - nstat->rx_over_errors = hwstat->rx_resource_errors; - nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors; - nstat->rx_frame_errors = hwstat->rx_alignment_errors; - nstat->rx_fifo_errors = hwstat->rx_overruns; - nstat->tx_aborted_errors = hwstat->tx_excessive_collisions; - nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors; - nstat->tx_fifo_errors = hwstat->tx_underrun; - - return nstat; -} - -static void gem_get_ethtool_stats(struct net_device *dev, - struct ethtool_stats *stats, u64 *data) -{ - struct macb *bp; - - bp = netdev_priv(dev); - gem_update_stats(bp); - memcpy(data, &bp->ethtool_stats, sizeof(u64) * GEM_STATS_LEN); -} - -static int gem_get_sset_count(struct net_device *dev, int sset) -{ - switch (sset) { - case ETH_SS_STATS: - return GEM_STATS_LEN; - default: - return -EOPNOTSUPP; - } -} - -static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p) -{ - unsigned int i; - - switch (sset) { - case ETH_SS_STATS: - for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN) - memcpy(p, gem_statistics[i].stat_string, - ETH_GSTRING_LEN); - break; - } -} - -static struct net_device_stats *macb_get_stats(struct net_device *dev) -{ - struct macb *bp = netdev_priv(dev); - struct net_device_stats *nstat = &bp->dev->stats; - struct macb_stats *hwstat = &bp->hw_stats.macb; - - if (macb_is_gem(bp)) - return gem_get_stats(bp); - - /* read stats from hardware */ - macb_update_stats(bp); - - /* Convert HW stats into netdevice stats */ - nstat->rx_errors = (hwstat->rx_fcs_errors + - hwstat->rx_align_errors + - hwstat->rx_resource_errors + - hwstat->rx_overruns + - hwstat->rx_oversize_pkts + - hwstat->rx_jabbers + - hwstat->rx_undersize_pkts + - hwstat->rx_length_mismatch); - nstat->tx_errors = (hwstat->tx_late_cols + - hwstat->tx_excessive_cols + - hwstat->tx_underruns + - hwstat->tx_carrier_errors + - hwstat->sqe_test_errors); - nstat->collisions = (hwstat->tx_single_cols + - hwstat->tx_multiple_cols + - hwstat->tx_excessive_cols); - nstat->rx_length_errors = (hwstat->rx_oversize_pkts + - hwstat->rx_jabbers + - hwstat->rx_undersize_pkts + - hwstat->rx_length_mismatch); - nstat->rx_over_errors = hwstat->rx_resource_errors + - hwstat->rx_overruns; - nstat->rx_crc_errors = hwstat->rx_fcs_errors; - nstat->rx_frame_errors = hwstat->rx_align_errors; - nstat->rx_fifo_errors = hwstat->rx_overruns; - /* XXX: What does "missed" mean? */ - nstat->tx_aborted_errors = hwstat->tx_excessive_cols; - nstat->tx_carrier_errors = hwstat->tx_carrier_errors; - nstat->tx_fifo_errors = hwstat->tx_underruns; - /* Don't know about heartbeat or window errors... */ - - return nstat; -} - -static int macb_get_regs_len(struct net_device *netdev) -{ - return MACB_GREGS_NBR * sizeof(u32); -} - -static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs, - void *p) -{ - struct macb *bp = netdev_priv(dev); - unsigned int tail, head; - u32 *regs_buff = p; - - regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1)) - | MACB_GREGS_VERSION; - - tail = macb_tx_ring_wrap(bp, bp->queues[0].tx_tail); - head = macb_tx_ring_wrap(bp, bp->queues[0].tx_head); - - regs_buff[0] = macb_readl(bp, NCR); - regs_buff[1] = macb_or_gem_readl(bp, NCFGR); - regs_buff[2] = macb_readl(bp, NSR); - regs_buff[3] = macb_readl(bp, TSR); - regs_buff[4] = macb_readl(bp, RBQP); - regs_buff[5] = macb_readl(bp, TBQP); - regs_buff[6] = macb_readl(bp, RSR); - regs_buff[7] = macb_readl(bp, IMR); - - regs_buff[8] = tail; - regs_buff[9] = head; - regs_buff[10] = macb_tx_dma(&bp->queues[0], tail); - regs_buff[11] = macb_tx_dma(&bp->queues[0], head); - - if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) - regs_buff[12] = macb_or_gem_readl(bp, USRIO); - if (macb_is_gem(bp)) - regs_buff[13] = gem_readl(bp, DMACFG); -} - -static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol) -{ - struct macb *bp = netdev_priv(netdev); - - wol->supported = 0; - wol->wolopts = 0; - - if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) { - wol->supported = WAKE_MAGIC; - - if (bp->wol & MACB_WOL_ENABLED) - wol->wolopts |= WAKE_MAGIC; - } -} - -static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol) -{ - struct macb *bp = netdev_priv(netdev); - - if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) || - (wol->wolopts & ~WAKE_MAGIC)) - return -EOPNOTSUPP; - - if (wol->wolopts & WAKE_MAGIC) - bp->wol |= MACB_WOL_ENABLED; - else - bp->wol &= ~MACB_WOL_ENABLED; - - device_set_wakeup_enable(&bp->pdev->dev, bp->wol & MACB_WOL_ENABLED); - - return 0; -} - -static void macb_get_ringparam(struct net_device *netdev, - struct ethtool_ringparam *ring) -{ - struct macb *bp = netdev_priv(netdev); - - ring->rx_max_pending = MAX_RX_RING_SIZE; - ring->tx_max_pending = MAX_TX_RING_SIZE; - - ring->rx_pending = bp->rx_ring_size; - ring->tx_pending = bp->tx_ring_size; -} - -static int macb_set_ringparam(struct net_device *netdev, - struct ethtool_ringparam *ring) -{ - struct macb *bp = netdev_priv(netdev); - u32 new_rx_size, new_tx_size; - unsigned int reset = 0; - - if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending)) - return -EINVAL; - - new_rx_size = clamp_t(u32, ring->rx_pending, - MIN_RX_RING_SIZE, MAX_RX_RING_SIZE); - new_rx_size = roundup_pow_of_two(new_rx_size); - - new_tx_size = clamp_t(u32, ring->tx_pending, - MIN_TX_RING_SIZE, MAX_TX_RING_SIZE); - new_tx_size = roundup_pow_of_two(new_tx_size); - - if ((new_tx_size == bp->tx_ring_size) && - (new_rx_size == bp->rx_ring_size)) { - /* nothing to do */ - return 0; - } - - if (netif_running(bp->dev)) { - reset = 1; - macb_close(bp->dev); - } - - bp->rx_ring_size = new_rx_size; - bp->tx_ring_size = new_tx_size; - - if (reset) - macb_open(bp->dev); - - return 0; -} - -static int macb_get_ts_info(struct net_device *netdev, - struct ethtool_ts_info *info) -{ - struct macb *bp = netdev_priv(netdev); - - if (bp->ptp_info) - return bp->ptp_info->get_ts_info(netdev, info); - - return ethtool_op_get_ts_info(netdev, info); -} - -static const struct ethtool_ops macb_ethtool_ops = { - .get_regs_len = macb_get_regs_len, - .get_regs = macb_get_regs, - .get_link = ethtool_op_get_link, - .get_ts_info = ethtool_op_get_ts_info, - .get_wol = macb_get_wol, - .set_wol = macb_set_wol, - .get_link_ksettings = phy_ethtool_get_link_ksettings, - .set_link_ksettings = phy_ethtool_set_link_ksettings, - .get_ringparam = macb_get_ringparam, - .set_ringparam = macb_set_ringparam, -}; - -static const struct ethtool_ops gem_ethtool_ops = { - .get_regs_len = macb_get_regs_len, - .get_regs = macb_get_regs, - .get_link = ethtool_op_get_link, - .get_ts_info = macb_get_ts_info, - .get_ethtool_stats = gem_get_ethtool_stats, - .get_strings = gem_get_ethtool_strings, - .get_sset_count = gem_get_sset_count, - .get_link_ksettings = phy_ethtool_get_link_ksettings, - .set_link_ksettings = phy_ethtool_set_link_ksettings, - .get_ringparam = macb_get_ringparam, - .set_ringparam = macb_set_ringparam, -}; - -static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) -{ - struct phy_device *phydev = dev->phydev; - struct macb *bp = netdev_priv(dev); - - if (!netif_running(dev)) - return -EINVAL; - - if (!phydev) - return -ENODEV; - - if (!bp->ptp_info) - return phy_mii_ioctl(phydev, rq, cmd); - - switch (cmd) { - case SIOCSHWTSTAMP: - return bp->ptp_info->set_hwtst(dev, rq, cmd); - case SIOCGHWTSTAMP: - return bp->ptp_info->get_hwtst(dev, rq); - default: - return phy_mii_ioctl(phydev, rq, cmd); - } -} - -static int macb_set_features(struct net_device *netdev, - netdev_features_t features) -{ - struct macb *bp = netdev_priv(netdev); - netdev_features_t changed = features ^ netdev->features; - - /* TX checksum offload */ - if ((changed & NETIF_F_HW_CSUM) && macb_is_gem(bp)) { - u32 dmacfg; - - dmacfg = gem_readl(bp, DMACFG); - if (features & NETIF_F_HW_CSUM) - dmacfg |= GEM_BIT(TXCOEN); - else - dmacfg &= ~GEM_BIT(TXCOEN); - gem_writel(bp, DMACFG, dmacfg); - } - - /* RX checksum offload */ - if ((changed & NETIF_F_RXCSUM) && macb_is_gem(bp)) { - u32 netcfg; - - netcfg = gem_readl(bp, NCFGR); - if (features & NETIF_F_RXCSUM && - !(netdev->flags & IFF_PROMISC)) - netcfg |= GEM_BIT(RXCOEN); - else - netcfg &= ~GEM_BIT(RXCOEN); - gem_writel(bp, NCFGR, netcfg); - } - - return 0; -} - -static const struct net_device_ops macb_netdev_ops = { - .ndo_open = macb_open, - .ndo_stop = macb_close, - .ndo_start_xmit = macb_start_xmit, - .ndo_set_rx_mode = macb_set_rx_mode, - .ndo_get_stats = macb_get_stats, - .ndo_do_ioctl = macb_ioctl, - .ndo_validate_addr = eth_validate_addr, - .ndo_change_mtu = macb_change_mtu, - .ndo_set_mac_address = eth_mac_addr, -#ifdef CONFIG_NET_POLL_CONTROLLER - .ndo_poll_controller = macb_poll_controller, -#endif - .ndo_set_features = macb_set_features, - .ndo_features_check = macb_features_check, -}; - -/* Configure peripheral capabilities according to device tree - * and integration options used - */ -static void macb_configure_caps(struct macb *bp, - const struct macb_config *dt_conf) -{ - u32 dcfg; - - if (dt_conf) - bp->caps = dt_conf->caps; - - if (hw_is_gem(bp->regs, bp->native_io)) { - bp->caps |= MACB_CAPS_MACB_IS_GEM; - - dcfg = gem_readl(bp, DCFG1); - if (GEM_BFEXT(IRQCOR, dcfg) == 0) - bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE; - dcfg = gem_readl(bp, DCFG2); - if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0) - bp->caps |= MACB_CAPS_FIFO_MODE; - if (IS_ENABLED(CONFIG_MACB_USE_HWSTAMP) && gem_has_ptp(bp)) { - if (!GEM_BFEXT(TSU, gem_readl(bp, DCFG5))) - pr_err("GEM doesn't support hardware ptp.\n"); - else - bp->hw_dma_cap |= HW_DMA_CAP_PTP; - } - } - - dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps); -} - -static void macb_probe_queues(void __iomem *mem, - bool native_io, - unsigned int *queue_mask, - unsigned int *num_queues) -{ - unsigned int hw_q; - - *queue_mask = 0x1; - *num_queues = 1; - - /* is it macb or gem ? - * - * We need to read directly from the hardware here because - * we are early in the probe process and don't have the - * MACB_CAPS_MACB_IS_GEM flag positioned - */ - if (!hw_is_gem(mem, native_io)) - return; - - /* bit 0 is never set but queue 0 always exists */ - *queue_mask = readl_relaxed(mem + GEM_DCFG6) & 0xff; - - *queue_mask |= 0x1; - - for (hw_q = 1; hw_q < MACB_MAX_QUEUES; ++hw_q) - if (*queue_mask & (1 << hw_q)) - (*num_queues)++; -} - -static int macb_clk_init(struct platform_device *pdev, struct clk **pclk, - struct clk **hclk, struct clk **tx_clk, - struct clk **rx_clk) -{ - struct macb_platform_data *pdata; - int err; - - pdata = dev_get_platdata(&pdev->dev); - if (pdata) { - *pclk = pdata->pclk; - *hclk = pdata->hclk; - } else { - *pclk = devm_clk_get(&pdev->dev, "pclk"); - *hclk = devm_clk_get(&pdev->dev, "hclk"); - } - - if (IS_ERR(*pclk)) { - err = PTR_ERR(*pclk); - dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err); - return err; - } - - if (IS_ERR(*hclk)) { - err = PTR_ERR(*hclk); - dev_err(&pdev->dev, "failed to get hclk (%u)\n", err); - return err; - } - - *tx_clk = devm_clk_get(&pdev->dev, "tx_clk"); - if (IS_ERR(*tx_clk)) - *tx_clk = NULL; - - *rx_clk = devm_clk_get(&pdev->dev, "rx_clk"); - if (IS_ERR(*rx_clk)) - *rx_clk = NULL; - - err = clk_prepare_enable(*pclk); - if (err) { - dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err); - return err; - } - - err = clk_prepare_enable(*hclk); - if (err) { - dev_err(&pdev->dev, "failed to enable hclk (%u)\n", err); - goto err_disable_pclk; - } - - err = clk_prepare_enable(*tx_clk); - if (err) { - dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err); - goto err_disable_hclk; - } - - err = clk_prepare_enable(*rx_clk); - if (err) { - dev_err(&pdev->dev, "failed to enable rx_clk (%u)\n", err); - goto err_disable_txclk; - } - - return 0; - -err_disable_txclk: - clk_disable_unprepare(*tx_clk); - -err_disable_hclk: - clk_disable_unprepare(*hclk); - -err_disable_pclk: - clk_disable_unprepare(*pclk); - - return err; -} - -static int macb_init(struct platform_device *pdev) -{ - struct net_device *dev = platform_get_drvdata(pdev); - unsigned int hw_q, q; - struct macb *bp = netdev_priv(dev); - struct macb_queue *queue; - int err; - u32 val; - - bp->tx_ring_size = DEFAULT_TX_RING_SIZE; - bp->rx_ring_size = DEFAULT_RX_RING_SIZE; - - /* set the queue register mapping once for all: queue0 has a special - * register mapping but we don't want to test the queue index then - * compute the corresponding register offset at run time. - */ - for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) { - if (!(bp->queue_mask & (1 << hw_q))) - continue; - - queue = &bp->queues[q]; - queue->bp = bp; - if (hw_q) { - queue->ISR = GEM_ISR(hw_q - 1); - queue->IER = GEM_IER(hw_q - 1); - queue->IDR = GEM_IDR(hw_q - 1); - queue->IMR = GEM_IMR(hw_q - 1); - queue->TBQP = GEM_TBQP(hw_q - 1); -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT - if (bp->hw_dma_cap & HW_DMA_CAP_64B) - queue->TBQPH = GEM_TBQPH(hw_q - 1); -#endif - } else { - /* queue0 uses legacy registers */ - queue->ISR = MACB_ISR; - queue->IER = MACB_IER; - queue->IDR = MACB_IDR; - queue->IMR = MACB_IMR; - queue->TBQP = MACB_TBQP; -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT - if (bp->hw_dma_cap & HW_DMA_CAP_64B) - queue->TBQPH = MACB_TBQPH; -#endif - } - - /* get irq: here we use the linux queue index, not the hardware - * queue index. the queue irq definitions in the device tree - * must remove the optional gaps that could exist in the - * hardware queue mask. - */ - queue->irq = platform_get_irq(pdev, q); - err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt, - IRQF_SHARED, dev->name, queue); - if (err) { - dev_err(&pdev->dev, - "Unable to request IRQ %d (error %d)\n", - queue->irq, err); - return err; - } - - INIT_WORK(&queue->tx_error_task, macb_tx_error_task); - q++; - } - - dev->netdev_ops = &macb_netdev_ops; - netif_napi_add(dev, &bp->napi, macb_poll, 64); - - /* setup appropriated routines according to adapter type */ - if (macb_is_gem(bp)) { - bp->max_tx_length = GEM_MAX_TX_LEN; - bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers; - bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers; - bp->macbgem_ops.mog_init_rings = gem_init_rings; - bp->macbgem_ops.mog_rx = gem_rx; - dev->ethtool_ops = &gem_ethtool_ops; - } else { - bp->max_tx_length = MACB_MAX_TX_LEN; - bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers; - bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers; - bp->macbgem_ops.mog_init_rings = macb_init_rings; - bp->macbgem_ops.mog_rx = macb_rx; - dev->ethtool_ops = &macb_ethtool_ops; - } - - /* Set features */ - dev->hw_features = NETIF_F_SG; - - /* Check LSO capability */ - if (GEM_BFEXT(PBUF_LSO, gem_readl(bp, DCFG6))) - dev->hw_features |= MACB_NETIF_LSO; - - /* Checksum offload is only available on gem with packet buffer */ - if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE)) - dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM; - if (bp->caps & MACB_CAPS_SG_DISABLED) - dev->hw_features &= ~NETIF_F_SG; - dev->features = dev->hw_features; - - if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) { - val = 0; - if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII) - val = GEM_BIT(RGMII); - else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII && - (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII)) - val = MACB_BIT(RMII); - else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII)) - val = MACB_BIT(MII); - - if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN) - val |= MACB_BIT(CLKEN); - - macb_or_gem_writel(bp, USRIO, val); - } - - /* Set MII management clock divider */ - val = macb_mdc_clk_div(bp); - val |= macb_dbw(bp); - if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) - val |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL); - macb_writel(bp, NCFGR, val); - - return 0; -} - -#if defined(CONFIG_OF) -/* 1518 rounded up */ -#define AT91ETHER_MAX_RBUFF_SZ 0x600 -/* max number of receive buffers */ -#define AT91ETHER_MAX_RX_DESCR 9 - -/* Initialize and start the Receiver and Transmit subsystems */ -static int at91ether_start(struct net_device *dev) -{ - struct macb *lp = netdev_priv(dev); - struct macb_dma_desc *desc; - dma_addr_t addr; - u32 ctl; - int i; - - lp->rx_ring = dma_alloc_coherent(&lp->pdev->dev, - (AT91ETHER_MAX_RX_DESCR * - macb_dma_desc_get_size(lp)), - &lp->rx_ring_dma, GFP_KERNEL); - if (!lp->rx_ring) - return -ENOMEM; - - lp->rx_buffers = dma_alloc_coherent(&lp->pdev->dev, - AT91ETHER_MAX_RX_DESCR * - AT91ETHER_MAX_RBUFF_SZ, - &lp->rx_buffers_dma, GFP_KERNEL); - if (!lp->rx_buffers) { - dma_free_coherent(&lp->pdev->dev, - AT91ETHER_MAX_RX_DESCR * - macb_dma_desc_get_size(lp), - lp->rx_ring, lp->rx_ring_dma); - lp->rx_ring = NULL; - return -ENOMEM; - } - - addr = lp->rx_buffers_dma; - for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) { - desc = macb_rx_desc(lp, i); - macb_set_addr(lp, desc, addr); - desc->ctrl = 0; - addr += AT91ETHER_MAX_RBUFF_SZ; - } - - /* Set the Wrap bit on the last descriptor */ - desc->addr |= MACB_BIT(RX_WRAP); - - /* Reset buffer index */ - lp->rx_tail = 0; - - /* Program address of descriptor list in Rx Buffer Queue register */ - macb_writel(lp, RBQP, lp->rx_ring_dma); - - /* Enable Receive and Transmit */ - ctl = macb_readl(lp, NCR); - macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE)); - - return 0; -} - -/* Open the ethernet interface */ -static int at91ether_open(struct net_device *dev) -{ - struct macb *lp = netdev_priv(dev); - u32 ctl; - int ret; - - /* Clear internal statistics */ - ctl = macb_readl(lp, NCR); - macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT)); - - macb_set_hwaddr(lp); - - ret = at91ether_start(dev); - if (ret) - return ret; - - /* Enable MAC interrupts */ - macb_writel(lp, IER, MACB_BIT(RCOMP) | - MACB_BIT(RXUBR) | - MACB_BIT(ISR_TUND) | - MACB_BIT(ISR_RLE) | - MACB_BIT(TCOMP) | - MACB_BIT(ISR_ROVR) | - MACB_BIT(HRESP)); - - /* schedule a link state check */ - phy_start(dev->phydev); - - netif_start_queue(dev); - - return 0; -} - -/* Close the interface */ -static int at91ether_close(struct net_device *dev) -{ - struct macb *lp = netdev_priv(dev); - u32 ctl; - - /* Disable Receiver and Transmitter */ - ctl = macb_readl(lp, NCR); - macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE))); - - /* Disable MAC interrupts */ - macb_writel(lp, IDR, MACB_BIT(RCOMP) | - MACB_BIT(RXUBR) | - MACB_BIT(ISR_TUND) | - MACB_BIT(ISR_RLE) | - MACB_BIT(TCOMP) | - MACB_BIT(ISR_ROVR) | - MACB_BIT(HRESP)); - - netif_stop_queue(dev); - - dma_free_coherent(&lp->pdev->dev, - AT91ETHER_MAX_RX_DESCR * - macb_dma_desc_get_size(lp), - lp->rx_ring, lp->rx_ring_dma); - lp->rx_ring = NULL; - - dma_free_coherent(&lp->pdev->dev, - AT91ETHER_MAX_RX_DESCR * AT91ETHER_MAX_RBUFF_SZ, - lp->rx_buffers, lp->rx_buffers_dma); - lp->rx_buffers = NULL; - - return 0; -} - -/* Transmit packet */ -static int at91ether_start_xmit(struct sk_buff *skb, struct net_device *dev) -{ - struct macb *lp = netdev_priv(dev); - - if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) { - netif_stop_queue(dev); - - /* Store packet information (to free when Tx completed) */ - lp->skb = skb; - lp->skb_length = skb->len; - lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len, - DMA_TO_DEVICE); - if (dma_mapping_error(NULL, lp->skb_physaddr)) { - dev_kfree_skb_any(skb); - dev->stats.tx_dropped++; - netdev_err(dev, "%s: DMA mapping error\n", __func__); - return NETDEV_TX_OK; - } - - /* Set address of the data in the Transmit Address register */ - macb_writel(lp, TAR, lp->skb_physaddr); - /* Set length of the packet in the Transmit Control register */ - macb_writel(lp, TCR, skb->len); - - } else { - netdev_err(dev, "%s called, but device is busy!\n", __func__); - return NETDEV_TX_BUSY; - } - - return NETDEV_TX_OK; -} - -/* Extract received frame from buffer descriptors and sent to upper layers. - * (Called from interrupt context) - */ -static void at91ether_rx(struct net_device *dev) -{ - struct macb *lp = netdev_priv(dev); - struct macb_dma_desc *desc; - unsigned char *p_recv; - struct sk_buff *skb; - unsigned int pktlen; - - desc = macb_rx_desc(lp, lp->rx_tail); - while (desc->addr & MACB_BIT(RX_USED)) { - p_recv = lp->rx_buffers + lp->rx_tail * AT91ETHER_MAX_RBUFF_SZ; - pktlen = MACB_BF(RX_FRMLEN, desc->ctrl); - skb = netdev_alloc_skb(dev, pktlen + 2); - if (skb) { - skb_reserve(skb, 2); - skb_put_data(skb, p_recv, pktlen); - - skb->protocol = eth_type_trans(skb, dev); - dev->stats.rx_packets++; - dev->stats.rx_bytes += pktlen; - netif_rx(skb); - } else { - dev->stats.rx_dropped++; - } - - if (desc->ctrl & MACB_BIT(RX_MHASH_MATCH)) - dev->stats.multicast++; - - /* reset ownership bit */ - desc->addr &= ~MACB_BIT(RX_USED); - - /* wrap after last buffer */ - if (lp->rx_tail == AT91ETHER_MAX_RX_DESCR - 1) - lp->rx_tail = 0; - else - lp->rx_tail++; - - desc = macb_rx_desc(lp, lp->rx_tail); - } -} - -/* MAC interrupt handler */ -static irqreturn_t at91ether_interrupt(int irq, void *dev_id) -{ - struct net_device *dev = dev_id; - struct macb *lp = netdev_priv(dev); - u32 intstatus, ctl; - - /* MAC Interrupt Status register indicates what interrupts are pending. - * It is automatically cleared once read. - */ - intstatus = macb_readl(lp, ISR); - - /* Receive complete */ - if (intstatus & MACB_BIT(RCOMP)) - at91ether_rx(dev); - - /* Transmit complete */ - if (intstatus & MACB_BIT(TCOMP)) { - /* The TCOM bit is set even if the transmission failed */ - if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE))) - dev->stats.tx_errors++; - - if (lp->skb) { - dev_kfree_skb_irq(lp->skb); - lp->skb = NULL; - dma_unmap_single(NULL, lp->skb_physaddr, - lp->skb_length, DMA_TO_DEVICE); - dev->stats.tx_packets++; - dev->stats.tx_bytes += lp->skb_length; - } - netif_wake_queue(dev); - } - - /* Work-around for EMAC Errata section 41.3.1 */ - if (intstatus & MACB_BIT(RXUBR)) { - ctl = macb_readl(lp, NCR); - macb_writel(lp, NCR, ctl & ~MACB_BIT(RE)); - wmb(); - macb_writel(lp, NCR, ctl | MACB_BIT(RE)); - } - - if (intstatus & MACB_BIT(ISR_ROVR)) - netdev_err(dev, "ROVR error\n"); - - return IRQ_HANDLED; -} - -#ifdef CONFIG_NET_POLL_CONTROLLER -static void at91ether_poll_controller(struct net_device *dev) -{ - unsigned long flags; - - local_irq_save(flags); - at91ether_interrupt(dev->irq, dev); - local_irq_restore(flags); -} -#endif - -static const struct net_device_ops at91ether_netdev_ops = { - .ndo_open = at91ether_open, - .ndo_stop = at91ether_close, - .ndo_start_xmit = at91ether_start_xmit, - .ndo_get_stats = macb_get_stats, - .ndo_set_rx_mode = macb_set_rx_mode, - .ndo_set_mac_address = eth_mac_addr, - .ndo_do_ioctl = macb_ioctl, - .ndo_validate_addr = eth_validate_addr, -#ifdef CONFIG_NET_POLL_CONTROLLER - .ndo_poll_controller = at91ether_poll_controller, -#endif -}; - -static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk, - struct clk **hclk, struct clk **tx_clk, - struct clk **rx_clk) -{ - int err; - - *hclk = NULL; - *tx_clk = NULL; - *rx_clk = NULL; - - *pclk = devm_clk_get(&pdev->dev, "ether_clk"); - if (IS_ERR(*pclk)) - return PTR_ERR(*pclk); - - err = clk_prepare_enable(*pclk); - if (err) { - dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err); - return err; - } - - return 0; -} - -static int at91ether_init(struct platform_device *pdev) -{ - struct net_device *dev = platform_get_drvdata(pdev); - struct macb *bp = netdev_priv(dev); - int err; - u32 reg; - - dev->netdev_ops = &at91ether_netdev_ops; - dev->ethtool_ops = &macb_ethtool_ops; - - err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt, - 0, dev->name, dev); - if (err) - return err; - - macb_writel(bp, NCR, 0); - - reg = MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG); - if (bp->phy_interface == PHY_INTERFACE_MODE_RMII) - reg |= MACB_BIT(RM9200_RMII); - - macb_writel(bp, NCFGR, reg); - - return 0; -} - -static const struct macb_config at91sam9260_config = { - .caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, - .clk_init = macb_clk_init, - .init = macb_init, -}; - -static const struct macb_config pc302gem_config = { - .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE, - .dma_burst_length = 16, - .clk_init = macb_clk_init, - .init = macb_init, -}; - -static const struct macb_config sama5d2_config = { - .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, - .dma_burst_length = 16, - .clk_init = macb_clk_init, - .init = macb_init, -}; - -static const struct macb_config sama5d3_config = { - .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE - | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, - .dma_burst_length = 16, - .clk_init = macb_clk_init, - .init = macb_init, -}; - -static const struct macb_config sama5d4_config = { - .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, - .dma_burst_length = 4, - .clk_init = macb_clk_init, - .init = macb_init, -}; - -static const struct macb_config emac_config = { - .clk_init = at91ether_clk_init, - .init = at91ether_init, -}; - -static const struct macb_config np4_config = { - .caps = MACB_CAPS_USRIO_DISABLED, - .clk_init = macb_clk_init, - .init = macb_init, -}; - -static const struct macb_config zynqmp_config = { - .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO, - .dma_burst_length = 16, - .clk_init = macb_clk_init, - .init = macb_init, - .jumbo_max_len = 10240, -}; - -static const struct macb_config zynq_config = { - .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_NO_GIGABIT_HALF, - .dma_burst_length = 16, - .clk_init = macb_clk_init, - .init = macb_init, -}; - -static const struct of_device_id macb_dt_ids[] = { - { .compatible = "cdns,at32ap7000-macb" }, - { .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config }, - { .compatible = "cdns,macb" }, - { .compatible = "cdns,np4-macb", .data = &np4_config }, - { .compatible = "cdns,pc302-gem", .data = &pc302gem_config }, - { .compatible = "cdns,gem", .data = &pc302gem_config }, - { .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config }, - { .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config }, - { .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config }, - { .compatible = "cdns,at91rm9200-emac", .data = &emac_config }, - { .compatible = "cdns,emac", .data = &emac_config }, - { .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config}, - { .compatible = "cdns,zynq-gem", .data = &zynq_config }, - { /* sentinel */ } -}; -MODULE_DEVICE_TABLE(of, macb_dt_ids); -#endif /* CONFIG_OF */ - -static const struct macb_config default_gem_config = { - .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO, - .dma_burst_length = 16, - .clk_init = macb_clk_init, - .init = macb_init, - .jumbo_max_len = 10240, -}; - -static int macb_probe(struct platform_device *pdev) -{ - const struct macb_config *macb_config = &default_gem_config; - int (*clk_init)(struct platform_device *, struct clk **, - struct clk **, struct clk **, struct clk **) - = macb_config->clk_init; - int (*init)(struct platform_device *) = macb_config->init; - struct device_node *np = pdev->dev.of_node; - struct device_node *phy_node; - struct clk *pclk, *hclk = NULL, *tx_clk = NULL, *rx_clk = NULL; - unsigned int queue_mask, num_queues; - struct macb_platform_data *pdata; - bool native_io; - struct phy_device *phydev; - struct net_device *dev; - struct resource *regs; - void __iomem *mem; - const char *mac; - struct macb *bp; - int err; - - regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); - mem = devm_ioremap_resource(&pdev->dev, regs); - if (IS_ERR(mem)) - return PTR_ERR(mem); - - if (np) { - const struct of_device_id *match; - - match = of_match_node(macb_dt_ids, np); - if (match && match->data) { - macb_config = match->data; - clk_init = macb_config->clk_init; - init = macb_config->init; - } - } - - err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk); - if (err) - return err; - - native_io = hw_is_native_io(mem); - - macb_probe_queues(mem, native_io, &queue_mask, &num_queues); - dev = alloc_etherdev_mq(sizeof(*bp), num_queues); - if (!dev) { - err = -ENOMEM; - goto err_disable_clocks; - } - - dev->base_addr = regs->start; - - SET_NETDEV_DEV(dev, &pdev->dev); - - bp = netdev_priv(dev); - bp->pdev = pdev; - bp->dev = dev; - bp->regs = mem; - bp->native_io = native_io; - if (native_io) { - bp->macb_reg_readl = hw_readl_native; - bp->macb_reg_writel = hw_writel_native; - } else { - bp->macb_reg_readl = hw_readl; - bp->macb_reg_writel = hw_writel; - } - bp->num_queues = num_queues; - bp->queue_mask = queue_mask; - if (macb_config) - bp->dma_burst_length = macb_config->dma_burst_length; - bp->pclk = pclk; - bp->hclk = hclk; - bp->tx_clk = tx_clk; - bp->rx_clk = rx_clk; - if (macb_config) - bp->jumbo_max_len = macb_config->jumbo_max_len; - - bp->wol = 0; - if (of_get_property(np, "magic-packet", NULL)) - bp->wol |= MACB_WOL_HAS_MAGIC_PACKET; - device_init_wakeup(&pdev->dev, bp->wol & MACB_WOL_HAS_MAGIC_PACKET); - - spin_lock_init(&bp->lock); - - /* setup capabilities */ - macb_configure_caps(bp, macb_config); - -#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT - if (GEM_BFEXT(DAW64, gem_readl(bp, DCFG6))) { - dma_set_mask(&pdev->dev, DMA_BIT_MASK(44)); - bp->hw_dma_cap |= HW_DMA_CAP_64B; - } -#endif - platform_set_drvdata(pdev, dev); - - dev->irq = platform_get_irq(pdev, 0); - if (dev->irq < 0) { - err = dev->irq; - goto err_out_free_netdev; - } - - /* MTU range: 68 - 1500 or 10240 */ - dev->min_mtu = GEM_MTU_MIN_SIZE; - if (bp->caps & MACB_CAPS_JUMBO) - dev->max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN; - else - dev->max_mtu = ETH_DATA_LEN; - - mac = of_get_mac_address(np); - if (mac) - ether_addr_copy(bp->dev->dev_addr, mac); - else - macb_get_hwaddr(bp); - - /* Power up the PHY if there is a GPIO reset */ - phy_node = of_get_next_available_child(np, NULL); - if (phy_node) { - int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0); - - if (gpio_is_valid(gpio)) { - bp->reset_gpio = gpio_to_desc(gpio); - gpiod_direction_output(bp->reset_gpio, 1); - } - } - of_node_put(phy_node); - - err = of_get_phy_mode(np); - if (err < 0) { - pdata = dev_get_platdata(&pdev->dev); - if (pdata && pdata->is_rmii) - bp->phy_interface = PHY_INTERFACE_MODE_RMII; - else - bp->phy_interface = PHY_INTERFACE_MODE_MII; - } else { - bp->phy_interface = err; - } - - /* IP specific init */ - err = init(pdev); - if (err) - goto err_out_free_netdev; - - err = macb_mii_init(bp); - if (err) - goto err_out_free_netdev; - - phydev = dev->phydev; - - netif_carrier_off(dev); - - err = register_netdev(dev); - if (err) { - dev_err(&pdev->dev, "Cannot register net device, aborting.\n"); - goto err_out_unregister_mdio; - } - - phy_attached_info(phydev); - - netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n", - macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID), - dev->base_addr, dev->irq, dev->dev_addr); - - return 0; - -err_out_unregister_mdio: - phy_disconnect(dev->phydev); - mdiobus_unregister(bp->mii_bus); - mdiobus_free(bp->mii_bus); - - /* Shutdown the PHY if there is a GPIO reset */ - if (bp->reset_gpio) - gpiod_set_value(bp->reset_gpio, 0); - -err_out_free_netdev: - free_netdev(dev); - -err_disable_clocks: - clk_disable_unprepare(tx_clk); - clk_disable_unprepare(hclk); - clk_disable_unprepare(pclk); - clk_disable_unprepare(rx_clk); - - return err; -} - -static int macb_remove(struct platform_device *pdev) -{ - struct net_device *dev; - struct macb *bp; - - dev = platform_get_drvdata(pdev); - - if (dev) { - bp = netdev_priv(dev); - if (dev->phydev) - phy_disconnect(dev->phydev); - mdiobus_unregister(bp->mii_bus); - dev->phydev = NULL; - mdiobus_free(bp->mii_bus); - - /* Shutdown the PHY if there is a GPIO reset */ - if (bp->reset_gpio) - gpiod_set_value(bp->reset_gpio, 0); - - unregister_netdev(dev); - clk_disable_unprepare(bp->tx_clk); - clk_disable_unprepare(bp->hclk); - clk_disable_unprepare(bp->pclk); - clk_disable_unprepare(bp->rx_clk); - of_node_put(bp->phy_node); - free_netdev(dev); - } - - return 0; -} - -static int __maybe_unused macb_suspend(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct net_device *netdev = platform_get_drvdata(pdev); - struct macb *bp = netdev_priv(netdev); - - netif_carrier_off(netdev); - netif_device_detach(netdev); - - if (bp->wol & MACB_WOL_ENABLED) { - macb_writel(bp, IER, MACB_BIT(WOL)); - macb_writel(bp, WOL, MACB_BIT(MAG)); - enable_irq_wake(bp->queues[0].irq); - } else { - clk_disable_unprepare(bp->tx_clk); - clk_disable_unprepare(bp->hclk); - clk_disable_unprepare(bp->pclk); - clk_disable_unprepare(bp->rx_clk); - } - - return 0; -} - -static int __maybe_unused macb_resume(struct device *dev) -{ - struct platform_device *pdev = to_platform_device(dev); - struct net_device *netdev = platform_get_drvdata(pdev); - struct macb *bp = netdev_priv(netdev); - - if (bp->wol & MACB_WOL_ENABLED) { - macb_writel(bp, IDR, MACB_BIT(WOL)); - macb_writel(bp, WOL, 0); - disable_irq_wake(bp->queues[0].irq); - } else { - clk_prepare_enable(bp->pclk); - clk_prepare_enable(bp->hclk); - clk_prepare_enable(bp->tx_clk); - clk_prepare_enable(bp->rx_clk); - } - - netif_device_attach(netdev); - - return 0; -} - -static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume); - -static struct platform_driver macb_driver = { - .probe = macb_probe, - .remove = macb_remove, - .driver = { - .name = "macb", - .of_match_table = of_match_ptr(macb_dt_ids), - .pm = &macb_pm_ops, - }, -}; - -module_platform_driver(macb_driver); - -MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver"); -MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); -MODULE_ALIAS("platform:macb"); diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c new file mode 100644 index 000000000000..2d43a7619f58 --- /dev/null +++ b/drivers/net/ethernet/cadence/macb_main.c @@ -0,0 +1,3588 @@ +/* + * Cadence MACB/GEM Ethernet Controller driver + * + * Copyright (C) 2004-2006 Atmel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "macb.h" + +#define MACB_RX_BUFFER_SIZE 128 +#define RX_BUFFER_MULTIPLE 64 /* bytes */ + +#define DEFAULT_RX_RING_SIZE 512 /* must be power of 2 */ +#define MIN_RX_RING_SIZE 64 +#define MAX_RX_RING_SIZE 8192 +#define RX_RING_BYTES(bp) (macb_dma_desc_get_size(bp) \ + * (bp)->rx_ring_size) + +#define DEFAULT_TX_RING_SIZE 512 /* must be power of 2 */ +#define MIN_TX_RING_SIZE 64 +#define MAX_TX_RING_SIZE 4096 +#define TX_RING_BYTES(bp) (macb_dma_desc_get_size(bp) \ + * (bp)->tx_ring_size) + +/* level of occupied TX descriptors under which we wake up TX process */ +#define MACB_TX_WAKEUP_THRESH(bp) (3 * (bp)->tx_ring_size / 4) + +#define MACB_RX_INT_FLAGS (MACB_BIT(RCOMP) | MACB_BIT(RXUBR) \ + | MACB_BIT(ISR_ROVR)) +#define MACB_TX_ERR_FLAGS (MACB_BIT(ISR_TUND) \ + | MACB_BIT(ISR_RLE) \ + | MACB_BIT(TXERR)) +#define MACB_TX_INT_FLAGS (MACB_TX_ERR_FLAGS | MACB_BIT(TCOMP)) + +/* Max length of transmit frame must be a multiple of 8 bytes */ +#define MACB_TX_LEN_ALIGN 8 +#define MACB_MAX_TX_LEN ((unsigned int)((1 << MACB_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1))) +#define GEM_MAX_TX_LEN ((unsigned int)((1 << GEM_TX_FRMLEN_SIZE) - 1) & ~((unsigned int)(MACB_TX_LEN_ALIGN - 1))) + +#define GEM_MTU_MIN_SIZE ETH_MIN_MTU +#define MACB_NETIF_LSO (NETIF_F_TSO | NETIF_F_UFO) + +#define MACB_WOL_HAS_MAGIC_PACKET (0x1 << 0) +#define MACB_WOL_ENABLED (0x1 << 1) + +/* Graceful stop timeouts in us. We should allow up to + * 1 frame time (10 Mbits/s, full-duplex, ignoring collisions) + */ +#define MACB_HALT_TIMEOUT 1230 + +/* DMA buffer descriptor might be different size + * depends on hardware configuration: + * + * 1. dma address width 32 bits: + * word 1: 32 bit address of Data Buffer + * word 2: control + * + * 2. dma address width 64 bits: + * word 1: 32 bit address of Data Buffer + * word 2: control + * word 3: upper 32 bit address of Data Buffer + * word 4: unused + * + * 3. dma address width 32 bits with hardware timestamping: + * word 1: 32 bit address of Data Buffer + * word 2: control + * word 3: timestamp word 1 + * word 4: timestamp word 2 + * + * 4. dma address width 64 bits with hardware timestamping: + * word 1: 32 bit address of Data Buffer + * word 2: control + * word 3: upper 32 bit address of Data Buffer + * word 4: unused + * word 5: timestamp word 1 + * word 6: timestamp word 2 + */ +static unsigned int macb_dma_desc_get_size(struct macb *bp) +{ +#ifdef MACB_EXT_DESC + unsigned int desc_size; + + switch (bp->hw_dma_cap) { + case HW_DMA_CAP_64B: + desc_size = sizeof(struct macb_dma_desc) + + sizeof(struct macb_dma_desc_64); + break; + case HW_DMA_CAP_PTP: + desc_size = sizeof(struct macb_dma_desc) + + sizeof(struct macb_dma_desc_ptp); + break; + case HW_DMA_CAP_64B_PTP: + desc_size = sizeof(struct macb_dma_desc) + + sizeof(struct macb_dma_desc_64) + + sizeof(struct macb_dma_desc_ptp); + break; + default: + desc_size = sizeof(struct macb_dma_desc); + } + return desc_size; +#endif + return sizeof(struct macb_dma_desc); +} + +static unsigned int macb_adj_dma_desc_idx(struct macb *bp, unsigned int desc_idx) +{ +#ifdef MACB_EXT_DESC + switch (bp->hw_dma_cap) { + case HW_DMA_CAP_64B: + case HW_DMA_CAP_PTP: + desc_idx <<= 1; + break; + case HW_DMA_CAP_64B_PTP: + desc_idx *= 3; + break; + default: + break; + } + return desc_idx; +#endif + return desc_idx; +} + +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT +static struct macb_dma_desc_64 *macb_64b_desc(struct macb *bp, struct macb_dma_desc *desc) +{ + if (bp->hw_dma_cap & HW_DMA_CAP_64B) + return (struct macb_dma_desc_64 *)((void *)desc + sizeof(struct macb_dma_desc)); + return NULL; +} +#endif + +/* Ring buffer accessors */ +static unsigned int macb_tx_ring_wrap(struct macb *bp, unsigned int index) +{ + return index & (bp->tx_ring_size - 1); +} + +static struct macb_dma_desc *macb_tx_desc(struct macb_queue *queue, + unsigned int index) +{ + index = macb_tx_ring_wrap(queue->bp, index); + index = macb_adj_dma_desc_idx(queue->bp, index); + return &queue->tx_ring[index]; +} + +static struct macb_tx_skb *macb_tx_skb(struct macb_queue *queue, + unsigned int index) +{ + return &queue->tx_skb[macb_tx_ring_wrap(queue->bp, index)]; +} + +static dma_addr_t macb_tx_dma(struct macb_queue *queue, unsigned int index) +{ + dma_addr_t offset; + + offset = macb_tx_ring_wrap(queue->bp, index) * + macb_dma_desc_get_size(queue->bp); + + return queue->tx_ring_dma + offset; +} + +static unsigned int macb_rx_ring_wrap(struct macb *bp, unsigned int index) +{ + return index & (bp->rx_ring_size - 1); +} + +static struct macb_dma_desc *macb_rx_desc(struct macb *bp, unsigned int index) +{ + index = macb_rx_ring_wrap(bp, index); + index = macb_adj_dma_desc_idx(bp, index); + return &bp->rx_ring[index]; +} + +static void *macb_rx_buffer(struct macb *bp, unsigned int index) +{ + return bp->rx_buffers + bp->rx_buffer_size * + macb_rx_ring_wrap(bp, index); +} + +/* I/O accessors */ +static u32 hw_readl_native(struct macb *bp, int offset) +{ + return __raw_readl(bp->regs + offset); +} + +static void hw_writel_native(struct macb *bp, int offset, u32 value) +{ + __raw_writel(value, bp->regs + offset); +} + +static u32 hw_readl(struct macb *bp, int offset) +{ + return readl_relaxed(bp->regs + offset); +} + +static void hw_writel(struct macb *bp, int offset, u32 value) +{ + writel_relaxed(value, bp->regs + offset); +} + +/* Find the CPU endianness by using the loopback bit of NCR register. When the + * CPU is in big endian we need to program swapped mode for management + * descriptor access. + */ +static bool hw_is_native_io(void __iomem *addr) +{ + u32 value = MACB_BIT(LLB); + + __raw_writel(value, addr + MACB_NCR); + value = __raw_readl(addr + MACB_NCR); + + /* Write 0 back to disable everything */ + __raw_writel(0, addr + MACB_NCR); + + return value == MACB_BIT(LLB); +} + +static bool hw_is_gem(void __iomem *addr, bool native_io) +{ + u32 id; + + if (native_io) + id = __raw_readl(addr + MACB_MID); + else + id = readl_relaxed(addr + MACB_MID); + + return MACB_BFEXT(IDNUM, id) >= 0x2; +} + +static void macb_set_hwaddr(struct macb *bp) +{ + u32 bottom; + u16 top; + + bottom = cpu_to_le32(*((u32 *)bp->dev->dev_addr)); + macb_or_gem_writel(bp, SA1B, bottom); + top = cpu_to_le16(*((u16 *)(bp->dev->dev_addr + 4))); + macb_or_gem_writel(bp, SA1T, top); + + /* Clear unused address register sets */ + macb_or_gem_writel(bp, SA2B, 0); + macb_or_gem_writel(bp, SA2T, 0); + macb_or_gem_writel(bp, SA3B, 0); + macb_or_gem_writel(bp, SA3T, 0); + macb_or_gem_writel(bp, SA4B, 0); + macb_or_gem_writel(bp, SA4T, 0); +} + +static void macb_get_hwaddr(struct macb *bp) +{ + struct macb_platform_data *pdata; + u32 bottom; + u16 top; + u8 addr[6]; + int i; + + pdata = dev_get_platdata(&bp->pdev->dev); + + /* Check all 4 address register for valid address */ + for (i = 0; i < 4; i++) { + bottom = macb_or_gem_readl(bp, SA1B + i * 8); + top = macb_or_gem_readl(bp, SA1T + i * 8); + + if (pdata && pdata->rev_eth_addr) { + addr[5] = bottom & 0xff; + addr[4] = (bottom >> 8) & 0xff; + addr[3] = (bottom >> 16) & 0xff; + addr[2] = (bottom >> 24) & 0xff; + addr[1] = top & 0xff; + addr[0] = (top & 0xff00) >> 8; + } else { + addr[0] = bottom & 0xff; + addr[1] = (bottom >> 8) & 0xff; + addr[2] = (bottom >> 16) & 0xff; + addr[3] = (bottom >> 24) & 0xff; + addr[4] = top & 0xff; + addr[5] = (top >> 8) & 0xff; + } + + if (is_valid_ether_addr(addr)) { + memcpy(bp->dev->dev_addr, addr, sizeof(addr)); + return; + } + } + + dev_info(&bp->pdev->dev, "invalid hw address, using random\n"); + eth_hw_addr_random(bp->dev); +} + +static int macb_mdio_read(struct mii_bus *bus, int mii_id, int regnum) +{ + struct macb *bp = bus->priv; + int value; + + macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF) + | MACB_BF(RW, MACB_MAN_READ) + | MACB_BF(PHYA, mii_id) + | MACB_BF(REGA, regnum) + | MACB_BF(CODE, MACB_MAN_CODE))); + + /* wait for end of transfer */ + while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR))) + cpu_relax(); + + value = MACB_BFEXT(DATA, macb_readl(bp, MAN)); + + return value; +} + +static int macb_mdio_write(struct mii_bus *bus, int mii_id, int regnum, + u16 value) +{ + struct macb *bp = bus->priv; + + macb_writel(bp, MAN, (MACB_BF(SOF, MACB_MAN_SOF) + | MACB_BF(RW, MACB_MAN_WRITE) + | MACB_BF(PHYA, mii_id) + | MACB_BF(REGA, regnum) + | MACB_BF(CODE, MACB_MAN_CODE) + | MACB_BF(DATA, value))); + + /* wait for end of transfer */ + while (!MACB_BFEXT(IDLE, macb_readl(bp, NSR))) + cpu_relax(); + + return 0; +} + +/** + * macb_set_tx_clk() - Set a clock to a new frequency + * @clk Pointer to the clock to change + * @rate New frequency in Hz + * @dev Pointer to the struct net_device + */ +static void macb_set_tx_clk(struct clk *clk, int speed, struct net_device *dev) +{ + long ferr, rate, rate_rounded; + + if (!clk) + return; + + switch (speed) { + case SPEED_10: + rate = 2500000; + break; + case SPEED_100: + rate = 25000000; + break; + case SPEED_1000: + rate = 125000000; + break; + default: + return; + } + + rate_rounded = clk_round_rate(clk, rate); + if (rate_rounded < 0) + return; + + /* RGMII allows 50 ppm frequency error. Test and warn if this limit + * is not satisfied. + */ + ferr = abs(rate_rounded - rate); + ferr = DIV_ROUND_UP(ferr, rate / 100000); + if (ferr > 5) + netdev_warn(dev, "unable to generate target frequency: %ld Hz\n", + rate); + + if (clk_set_rate(clk, rate_rounded)) + netdev_err(dev, "adjusting tx_clk failed.\n"); +} + +static void macb_handle_link_change(struct net_device *dev) +{ + struct macb *bp = netdev_priv(dev); + struct phy_device *phydev = dev->phydev; + unsigned long flags; + int status_change = 0; + + spin_lock_irqsave(&bp->lock, flags); + + if (phydev->link) { + if ((bp->speed != phydev->speed) || + (bp->duplex != phydev->duplex)) { + u32 reg; + + reg = macb_readl(bp, NCFGR); + reg &= ~(MACB_BIT(SPD) | MACB_BIT(FD)); + if (macb_is_gem(bp)) + reg &= ~GEM_BIT(GBE); + + if (phydev->duplex) + reg |= MACB_BIT(FD); + if (phydev->speed == SPEED_100) + reg |= MACB_BIT(SPD); + if (phydev->speed == SPEED_1000 && + bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) + reg |= GEM_BIT(GBE); + + macb_or_gem_writel(bp, NCFGR, reg); + + bp->speed = phydev->speed; + bp->duplex = phydev->duplex; + status_change = 1; + } + } + + if (phydev->link != bp->link) { + if (!phydev->link) { + bp->speed = 0; + bp->duplex = -1; + } + bp->link = phydev->link; + + status_change = 1; + } + + spin_unlock_irqrestore(&bp->lock, flags); + + if (status_change) { + if (phydev->link) { + /* Update the TX clock rate if and only if the link is + * up and there has been a link change. + */ + macb_set_tx_clk(bp->tx_clk, phydev->speed, dev); + + netif_carrier_on(dev); + netdev_info(dev, "link up (%d/%s)\n", + phydev->speed, + phydev->duplex == DUPLEX_FULL ? + "Full" : "Half"); + } else { + netif_carrier_off(dev); + netdev_info(dev, "link down\n"); + } + } +} + +/* based on au1000_eth. c*/ +static int macb_mii_probe(struct net_device *dev) +{ + struct macb *bp = netdev_priv(dev); + struct macb_platform_data *pdata; + struct phy_device *phydev; + int phy_irq; + int ret; + + if (bp->phy_node) { + phydev = of_phy_connect(dev, bp->phy_node, + &macb_handle_link_change, 0, + bp->phy_interface); + if (!phydev) + return -ENODEV; + } else { + phydev = phy_find_first(bp->mii_bus); + if (!phydev) { + netdev_err(dev, "no PHY found\n"); + return -ENXIO; + } + + pdata = dev_get_platdata(&bp->pdev->dev); + if (pdata) { + if (gpio_is_valid(pdata->phy_irq_pin)) { + ret = devm_gpio_request(&bp->pdev->dev, + pdata->phy_irq_pin, "phy int"); + if (!ret) { + phy_irq = gpio_to_irq(pdata->phy_irq_pin); + phydev->irq = (phy_irq < 0) ? PHY_POLL : phy_irq; + } + } else { + phydev->irq = PHY_POLL; + } + } + + /* attach the mac to the phy */ + ret = phy_connect_direct(dev, phydev, &macb_handle_link_change, + bp->phy_interface); + if (ret) { + netdev_err(dev, "Could not attach to PHY\n"); + return ret; + } + } + + /* mask with MAC supported features */ + if (macb_is_gem(bp) && bp->caps & MACB_CAPS_GIGABIT_MODE_AVAILABLE) + phydev->supported &= PHY_GBIT_FEATURES; + else + phydev->supported &= PHY_BASIC_FEATURES; + + if (bp->caps & MACB_CAPS_NO_GIGABIT_HALF) + phydev->supported &= ~SUPPORTED_1000baseT_Half; + + phydev->advertising = phydev->supported; + + bp->link = 0; + bp->speed = 0; + bp->duplex = -1; + + return 0; +} + +static int macb_mii_init(struct macb *bp) +{ + struct macb_platform_data *pdata; + struct device_node *np; + int err = -ENXIO, i; + + /* Enable management port */ + macb_writel(bp, NCR, MACB_BIT(MPE)); + + bp->mii_bus = mdiobus_alloc(); + if (!bp->mii_bus) { + err = -ENOMEM; + goto err_out; + } + + bp->mii_bus->name = "MACB_mii_bus"; + bp->mii_bus->read = &macb_mdio_read; + bp->mii_bus->write = &macb_mdio_write; + snprintf(bp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x", + bp->pdev->name, bp->pdev->id); + bp->mii_bus->priv = bp; + bp->mii_bus->parent = &bp->pdev->dev; + pdata = dev_get_platdata(&bp->pdev->dev); + + dev_set_drvdata(&bp->dev->dev, bp->mii_bus); + + np = bp->pdev->dev.of_node; + if (np) { + if (of_phy_is_fixed_link(np)) { + if (of_phy_register_fixed_link(np) < 0) { + dev_err(&bp->pdev->dev, + "broken fixed-link specification\n"); + goto err_out_unregister_bus; + } + bp->phy_node = of_node_get(np); + + err = mdiobus_register(bp->mii_bus); + } else { + /* try dt phy registration */ + err = of_mdiobus_register(bp->mii_bus, np); + + /* fallback to standard phy registration if no phy were + * found during dt phy registration + */ + if (!err && !phy_find_first(bp->mii_bus)) { + for (i = 0; i < PHY_MAX_ADDR; i++) { + struct phy_device *phydev; + + phydev = mdiobus_scan(bp->mii_bus, i); + if (IS_ERR(phydev) && + PTR_ERR(phydev) != -ENODEV) { + err = PTR_ERR(phydev); + break; + } + } + + if (err) + goto err_out_unregister_bus; + } + } + } else { + for (i = 0; i < PHY_MAX_ADDR; i++) + bp->mii_bus->irq[i] = PHY_POLL; + + if (pdata) + bp->mii_bus->phy_mask = pdata->phy_mask; + + err = mdiobus_register(bp->mii_bus); + } + + if (err) + goto err_out_free_mdiobus; + + err = macb_mii_probe(bp->dev); + if (err) + goto err_out_unregister_bus; + + return 0; + +err_out_unregister_bus: + mdiobus_unregister(bp->mii_bus); +err_out_free_mdiobus: + mdiobus_free(bp->mii_bus); +err_out: + return err; +} + +static void macb_update_stats(struct macb *bp) +{ + u32 *p = &bp->hw_stats.macb.rx_pause_frames; + u32 *end = &bp->hw_stats.macb.tx_pause_frames + 1; + int offset = MACB_PFR; + + WARN_ON((unsigned long)(end - p - 1) != (MACB_TPF - MACB_PFR) / 4); + + for (; p < end; p++, offset += 4) + *p += bp->macb_reg_readl(bp, offset); +} + +static int macb_halt_tx(struct macb *bp) +{ + unsigned long halt_time, timeout; + u32 status; + + macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(THALT)); + + timeout = jiffies + usecs_to_jiffies(MACB_HALT_TIMEOUT); + do { + halt_time = jiffies; + status = macb_readl(bp, TSR); + if (!(status & MACB_BIT(TGO))) + return 0; + + usleep_range(10, 250); + } while (time_before(halt_time, timeout)); + + return -ETIMEDOUT; +} + +static void macb_tx_unmap(struct macb *bp, struct macb_tx_skb *tx_skb) +{ + if (tx_skb->mapping) { + if (tx_skb->mapped_as_page) + dma_unmap_page(&bp->pdev->dev, tx_skb->mapping, + tx_skb->size, DMA_TO_DEVICE); + else + dma_unmap_single(&bp->pdev->dev, tx_skb->mapping, + tx_skb->size, DMA_TO_DEVICE); + tx_skb->mapping = 0; + } + + if (tx_skb->skb) { + dev_kfree_skb_any(tx_skb->skb); + tx_skb->skb = NULL; + } +} + +static void macb_set_addr(struct macb *bp, struct macb_dma_desc *desc, dma_addr_t addr) +{ +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + struct macb_dma_desc_64 *desc_64; + + if (bp->hw_dma_cap & HW_DMA_CAP_64B) { + desc_64 = macb_64b_desc(bp, desc); + desc_64->addrh = upper_32_bits(addr); + } +#endif + desc->addr = lower_32_bits(addr); +} + +static dma_addr_t macb_get_addr(struct macb *bp, struct macb_dma_desc *desc) +{ + dma_addr_t addr = 0; +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + struct macb_dma_desc_64 *desc_64; + + if (bp->hw_dma_cap & HW_DMA_CAP_64B) { + desc_64 = macb_64b_desc(bp, desc); + addr = ((u64)(desc_64->addrh) << 32); + } +#endif + addr |= MACB_BF(RX_WADDR, MACB_BFEXT(RX_WADDR, desc->addr)); + return addr; +} + +static void macb_tx_error_task(struct work_struct *work) +{ + struct macb_queue *queue = container_of(work, struct macb_queue, + tx_error_task); + struct macb *bp = queue->bp; + struct macb_tx_skb *tx_skb; + struct macb_dma_desc *desc; + struct sk_buff *skb; + unsigned int tail; + unsigned long flags; + + netdev_vdbg(bp->dev, "macb_tx_error_task: q = %u, t = %u, h = %u\n", + (unsigned int)(queue - bp->queues), + queue->tx_tail, queue->tx_head); + + /* Prevent the queue IRQ handlers from running: each of them may call + * macb_tx_interrupt(), which in turn may call netif_wake_subqueue(). + * As explained below, we have to halt the transmission before updating + * TBQP registers so we call netif_tx_stop_all_queues() to notify the + * network engine about the macb/gem being halted. + */ + spin_lock_irqsave(&bp->lock, flags); + + /* Make sure nobody is trying to queue up new packets */ + netif_tx_stop_all_queues(bp->dev); + + /* Stop transmission now + * (in case we have just queued new packets) + * macb/gem must be halted to write TBQP register + */ + if (macb_halt_tx(bp)) + /* Just complain for now, reinitializing TX path can be good */ + netdev_err(bp->dev, "BUG: halt tx timed out\n"); + + /* Treat frames in TX queue including the ones that caused the error. + * Free transmit buffers in upper layer. + */ + for (tail = queue->tx_tail; tail != queue->tx_head; tail++) { + u32 ctrl; + + desc = macb_tx_desc(queue, tail); + ctrl = desc->ctrl; + tx_skb = macb_tx_skb(queue, tail); + skb = tx_skb->skb; + + if (ctrl & MACB_BIT(TX_USED)) { + /* skb is set for the last buffer of the frame */ + while (!skb) { + macb_tx_unmap(bp, tx_skb); + tail++; + tx_skb = macb_tx_skb(queue, tail); + skb = tx_skb->skb; + } + + /* ctrl still refers to the first buffer descriptor + * since it's the only one written back by the hardware + */ + if (!(ctrl & MACB_BIT(TX_BUF_EXHAUSTED))) { + netdev_vdbg(bp->dev, "txerr skb %u (data %p) TX complete\n", + macb_tx_ring_wrap(bp, tail), + skb->data); + bp->dev->stats.tx_packets++; + bp->dev->stats.tx_bytes += skb->len; + } + } else { + /* "Buffers exhausted mid-frame" errors may only happen + * if the driver is buggy, so complain loudly about + * those. Statistics are updated by hardware. + */ + if (ctrl & MACB_BIT(TX_BUF_EXHAUSTED)) + netdev_err(bp->dev, + "BUG: TX buffers exhausted mid-frame\n"); + + desc->ctrl = ctrl | MACB_BIT(TX_USED); + } + + macb_tx_unmap(bp, tx_skb); + } + + /* Set end of TX queue */ + desc = macb_tx_desc(queue, 0); + macb_set_addr(bp, desc, 0); + desc->ctrl = MACB_BIT(TX_USED); + + /* Make descriptor updates visible to hardware */ + wmb(); + + /* Reinitialize the TX desc queue */ + queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma)); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (bp->hw_dma_cap & HW_DMA_CAP_64B) + queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma)); +#endif + /* Make TX ring reflect state of hardware */ + queue->tx_head = 0; + queue->tx_tail = 0; + + /* Housework before enabling TX IRQ */ + macb_writel(bp, TSR, macb_readl(bp, TSR)); + queue_writel(queue, IER, MACB_TX_INT_FLAGS); + + /* Now we are ready to start transmission again */ + netif_tx_start_all_queues(bp->dev); + macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); + + spin_unlock_irqrestore(&bp->lock, flags); +} + +static void macb_tx_interrupt(struct macb_queue *queue) +{ + unsigned int tail; + unsigned int head; + u32 status; + struct macb *bp = queue->bp; + u16 queue_index = queue - bp->queues; + + status = macb_readl(bp, TSR); + macb_writel(bp, TSR, status); + + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) + queue_writel(queue, ISR, MACB_BIT(TCOMP)); + + netdev_vdbg(bp->dev, "macb_tx_interrupt status = 0x%03lx\n", + (unsigned long)status); + + head = queue->tx_head; + for (tail = queue->tx_tail; tail != head; tail++) { + struct macb_tx_skb *tx_skb; + struct sk_buff *skb; + struct macb_dma_desc *desc; + u32 ctrl; + + desc = macb_tx_desc(queue, tail); + + /* Make hw descriptor updates visible to CPU */ + rmb(); + + ctrl = desc->ctrl; + + /* TX_USED bit is only set by hardware on the very first buffer + * descriptor of the transmitted frame. + */ + if (!(ctrl & MACB_BIT(TX_USED))) + break; + + /* Process all buffers of the current transmitted frame */ + for (;; tail++) { + tx_skb = macb_tx_skb(queue, tail); + skb = tx_skb->skb; + + /* First, update TX stats if needed */ + if (skb) { + netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n", + macb_tx_ring_wrap(bp, tail), + skb->data); + bp->dev->stats.tx_packets++; + bp->dev->stats.tx_bytes += skb->len; + } + + /* Now we can safely release resources */ + macb_tx_unmap(bp, tx_skb); + + /* skb is set only for the last buffer of the frame. + * WARNING: at this point skb has been freed by + * macb_tx_unmap(). + */ + if (skb) + break; + } + } + + queue->tx_tail = tail; + if (__netif_subqueue_stopped(bp->dev, queue_index) && + CIRC_CNT(queue->tx_head, queue->tx_tail, + bp->tx_ring_size) <= MACB_TX_WAKEUP_THRESH(bp)) + netif_wake_subqueue(bp->dev, queue_index); +} + +static void gem_rx_refill(struct macb *bp) +{ + unsigned int entry; + struct sk_buff *skb; + dma_addr_t paddr; + struct macb_dma_desc *desc; + + while (CIRC_SPACE(bp->rx_prepared_head, bp->rx_tail, + bp->rx_ring_size) > 0) { + entry = macb_rx_ring_wrap(bp, bp->rx_prepared_head); + + /* Make hw descriptor updates visible to CPU */ + rmb(); + + bp->rx_prepared_head++; + desc = macb_rx_desc(bp, entry); + + if (!bp->rx_skbuff[entry]) { + /* allocate sk_buff for this free entry in ring */ + skb = netdev_alloc_skb(bp->dev, bp->rx_buffer_size); + if (unlikely(!skb)) { + netdev_err(bp->dev, + "Unable to allocate sk_buff\n"); + break; + } + + /* now fill corresponding descriptor entry */ + paddr = dma_map_single(&bp->pdev->dev, skb->data, + bp->rx_buffer_size, + DMA_FROM_DEVICE); + if (dma_mapping_error(&bp->pdev->dev, paddr)) { + dev_kfree_skb(skb); + break; + } + + bp->rx_skbuff[entry] = skb; + + if (entry == bp->rx_ring_size - 1) + paddr |= MACB_BIT(RX_WRAP); + macb_set_addr(bp, desc, paddr); + desc->ctrl = 0; + + /* properly align Ethernet header */ + skb_reserve(skb, NET_IP_ALIGN); + } else { + desc->addr &= ~MACB_BIT(RX_USED); + desc->ctrl = 0; + } + } + + /* Make descriptor updates visible to hardware */ + wmb(); + + netdev_vdbg(bp->dev, "rx ring: prepared head %d, tail %d\n", + bp->rx_prepared_head, bp->rx_tail); +} + +/* Mark DMA descriptors from begin up to and not including end as unused */ +static void discard_partial_frame(struct macb *bp, unsigned int begin, + unsigned int end) +{ + unsigned int frag; + + for (frag = begin; frag != end; frag++) { + struct macb_dma_desc *desc = macb_rx_desc(bp, frag); + + desc->addr &= ~MACB_BIT(RX_USED); + } + + /* Make descriptor updates visible to hardware */ + wmb(); + + /* When this happens, the hardware stats registers for + * whatever caused this is updated, so we don't have to record + * anything. + */ +} + +static int gem_rx(struct macb *bp, int budget) +{ + unsigned int len; + unsigned int entry; + struct sk_buff *skb; + struct macb_dma_desc *desc; + int count = 0; + + while (count < budget) { + u32 ctrl; + dma_addr_t addr; + bool rxused; + + entry = macb_rx_ring_wrap(bp, bp->rx_tail); + desc = macb_rx_desc(bp, entry); + + /* Make hw descriptor updates visible to CPU */ + rmb(); + + rxused = (desc->addr & MACB_BIT(RX_USED)) ? true : false; + addr = macb_get_addr(bp, desc); + ctrl = desc->ctrl; + + if (!rxused) + break; + + bp->rx_tail++; + count++; + + if (!(ctrl & MACB_BIT(RX_SOF) && ctrl & MACB_BIT(RX_EOF))) { + netdev_err(bp->dev, + "not whole frame pointed by descriptor\n"); + bp->dev->stats.rx_dropped++; + break; + } + skb = bp->rx_skbuff[entry]; + if (unlikely(!skb)) { + netdev_err(bp->dev, + "inconsistent Rx descriptor chain\n"); + bp->dev->stats.rx_dropped++; + break; + } + /* now everything is ready for receiving packet */ + bp->rx_skbuff[entry] = NULL; + len = ctrl & bp->rx_frm_len_mask; + + netdev_vdbg(bp->dev, "gem_rx %u (len %u)\n", entry, len); + + skb_put(skb, len); + dma_unmap_single(&bp->pdev->dev, addr, + bp->rx_buffer_size, DMA_FROM_DEVICE); + + skb->protocol = eth_type_trans(skb, bp->dev); + skb_checksum_none_assert(skb); + if (bp->dev->features & NETIF_F_RXCSUM && + !(bp->dev->flags & IFF_PROMISC) && + GEM_BFEXT(RX_CSUM, ctrl) & GEM_RX_CSUM_CHECKED_MASK) + skb->ip_summed = CHECKSUM_UNNECESSARY; + + bp->dev->stats.rx_packets++; + bp->dev->stats.rx_bytes += skb->len; + +#if defined(DEBUG) && defined(VERBOSE_DEBUG) + netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n", + skb->len, skb->csum); + print_hex_dump(KERN_DEBUG, " mac: ", DUMP_PREFIX_ADDRESS, 16, 1, + skb_mac_header(skb), 16, true); + print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_ADDRESS, 16, 1, + skb->data, 32, true); +#endif + + netif_receive_skb(skb); + } + + gem_rx_refill(bp); + + return count; +} + +static int macb_rx_frame(struct macb *bp, unsigned int first_frag, + unsigned int last_frag) +{ + unsigned int len; + unsigned int frag; + unsigned int offset; + struct sk_buff *skb; + struct macb_dma_desc *desc; + + desc = macb_rx_desc(bp, last_frag); + len = desc->ctrl & bp->rx_frm_len_mask; + + netdev_vdbg(bp->dev, "macb_rx_frame frags %u - %u (len %u)\n", + macb_rx_ring_wrap(bp, first_frag), + macb_rx_ring_wrap(bp, last_frag), len); + + /* The ethernet header starts NET_IP_ALIGN bytes into the + * first buffer. Since the header is 14 bytes, this makes the + * payload word-aligned. + * + * Instead of calling skb_reserve(NET_IP_ALIGN), we just copy + * the two padding bytes into the skb so that we avoid hitting + * the slowpath in memcpy(), and pull them off afterwards. + */ + skb = netdev_alloc_skb(bp->dev, len + NET_IP_ALIGN); + if (!skb) { + bp->dev->stats.rx_dropped++; + for (frag = first_frag; ; frag++) { + desc = macb_rx_desc(bp, frag); + desc->addr &= ~MACB_BIT(RX_USED); + if (frag == last_frag) + break; + } + + /* Make descriptor updates visible to hardware */ + wmb(); + + return 1; + } + + offset = 0; + len += NET_IP_ALIGN; + skb_checksum_none_assert(skb); + skb_put(skb, len); + + for (frag = first_frag; ; frag++) { + unsigned int frag_len = bp->rx_buffer_size; + + if (offset + frag_len > len) { + if (unlikely(frag != last_frag)) { + dev_kfree_skb_any(skb); + return -1; + } + frag_len = len - offset; + } + skb_copy_to_linear_data_offset(skb, offset, + macb_rx_buffer(bp, frag), + frag_len); + offset += bp->rx_buffer_size; + desc = macb_rx_desc(bp, frag); + desc->addr &= ~MACB_BIT(RX_USED); + + if (frag == last_frag) + break; + } + + /* Make descriptor updates visible to hardware */ + wmb(); + + __skb_pull(skb, NET_IP_ALIGN); + skb->protocol = eth_type_trans(skb, bp->dev); + + bp->dev->stats.rx_packets++; + bp->dev->stats.rx_bytes += skb->len; + netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n", + skb->len, skb->csum); + netif_receive_skb(skb); + + return 0; +} + +static inline void macb_init_rx_ring(struct macb *bp) +{ + dma_addr_t addr; + struct macb_dma_desc *desc = NULL; + int i; + + addr = bp->rx_buffers_dma; + for (i = 0; i < bp->rx_ring_size; i++) { + desc = macb_rx_desc(bp, i); + macb_set_addr(bp, desc, addr); + desc->ctrl = 0; + addr += bp->rx_buffer_size; + } + desc->addr |= MACB_BIT(RX_WRAP); + bp->rx_tail = 0; +} + +static int macb_rx(struct macb *bp, int budget) +{ + bool reset_rx_queue = false; + int received = 0; + unsigned int tail; + int first_frag = -1; + + for (tail = bp->rx_tail; budget > 0; tail++) { + struct macb_dma_desc *desc = macb_rx_desc(bp, tail); + u32 ctrl; + + /* Make hw descriptor updates visible to CPU */ + rmb(); + + ctrl = desc->ctrl; + + if (!(desc->addr & MACB_BIT(RX_USED))) + break; + + if (ctrl & MACB_BIT(RX_SOF)) { + if (first_frag != -1) + discard_partial_frame(bp, first_frag, tail); + first_frag = tail; + } + + if (ctrl & MACB_BIT(RX_EOF)) { + int dropped; + + if (unlikely(first_frag == -1)) { + reset_rx_queue = true; + continue; + } + + dropped = macb_rx_frame(bp, first_frag, tail); + first_frag = -1; + if (unlikely(dropped < 0)) { + reset_rx_queue = true; + continue; + } + if (!dropped) { + received++; + budget--; + } + } + } + + if (unlikely(reset_rx_queue)) { + unsigned long flags; + u32 ctrl; + + netdev_err(bp->dev, "RX queue corruption: reset it\n"); + + spin_lock_irqsave(&bp->lock, flags); + + ctrl = macb_readl(bp, NCR); + macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE)); + + macb_init_rx_ring(bp); + macb_writel(bp, RBQP, bp->rx_ring_dma); + + macb_writel(bp, NCR, ctrl | MACB_BIT(RE)); + + spin_unlock_irqrestore(&bp->lock, flags); + return received; + } + + if (first_frag != -1) + bp->rx_tail = first_frag; + else + bp->rx_tail = tail; + + return received; +} + +static int macb_poll(struct napi_struct *napi, int budget) +{ + struct macb *bp = container_of(napi, struct macb, napi); + int work_done; + u32 status; + + status = macb_readl(bp, RSR); + macb_writel(bp, RSR, status); + + work_done = 0; + + netdev_vdbg(bp->dev, "poll: status = %08lx, budget = %d\n", + (unsigned long)status, budget); + + work_done = bp->macbgem_ops.mog_rx(bp, budget); + if (work_done < budget) { + napi_complete_done(napi, work_done); + + /* Packets received while interrupts were disabled */ + status = macb_readl(bp, RSR); + if (status) { + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) + macb_writel(bp, ISR, MACB_BIT(RCOMP)); + napi_reschedule(napi); + } else { + macb_writel(bp, IER, MACB_RX_INT_FLAGS); + } + } + + /* TODO: Handle errors */ + + return work_done; +} + +static irqreturn_t macb_interrupt(int irq, void *dev_id) +{ + struct macb_queue *queue = dev_id; + struct macb *bp = queue->bp; + struct net_device *dev = bp->dev; + u32 status, ctrl; + + status = queue_readl(queue, ISR); + + if (unlikely(!status)) + return IRQ_NONE; + + spin_lock(&bp->lock); + + while (status) { + /* close possible race with dev_close */ + if (unlikely(!netif_running(dev))) { + queue_writel(queue, IDR, -1); + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) + queue_writel(queue, ISR, -1); + break; + } + + netdev_vdbg(bp->dev, "queue = %u, isr = 0x%08lx\n", + (unsigned int)(queue - bp->queues), + (unsigned long)status); + + if (status & MACB_RX_INT_FLAGS) { + /* There's no point taking any more interrupts + * until we have processed the buffers. The + * scheduling call may fail if the poll routine + * is already scheduled, so disable interrupts + * now. + */ + queue_writel(queue, IDR, MACB_RX_INT_FLAGS); + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) + queue_writel(queue, ISR, MACB_BIT(RCOMP)); + + if (napi_schedule_prep(&bp->napi)) { + netdev_vdbg(bp->dev, "scheduling RX softirq\n"); + __napi_schedule(&bp->napi); + } + } + + if (unlikely(status & (MACB_TX_ERR_FLAGS))) { + queue_writel(queue, IDR, MACB_TX_INT_FLAGS); + schedule_work(&queue->tx_error_task); + + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) + queue_writel(queue, ISR, MACB_TX_ERR_FLAGS); + + break; + } + + if (status & MACB_BIT(TCOMP)) + macb_tx_interrupt(queue); + + /* Link change detection isn't possible with RMII, so we'll + * add that if/when we get our hands on a full-blown MII PHY. + */ + + /* There is a hardware issue under heavy load where DMA can + * stop, this causes endless "used buffer descriptor read" + * interrupts but it can be cleared by re-enabling RX. See + * the at91 manual, section 41.3.1 or the Zynq manual + * section 16.7.4 for details. + */ + if (status & MACB_BIT(RXUBR)) { + ctrl = macb_readl(bp, NCR); + macb_writel(bp, NCR, ctrl & ~MACB_BIT(RE)); + wmb(); + macb_writel(bp, NCR, ctrl | MACB_BIT(RE)); + + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) + queue_writel(queue, ISR, MACB_BIT(RXUBR)); + } + + if (status & MACB_BIT(ISR_ROVR)) { + /* We missed at least one packet */ + if (macb_is_gem(bp)) + bp->hw_stats.gem.rx_overruns++; + else + bp->hw_stats.macb.rx_overruns++; + + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) + queue_writel(queue, ISR, MACB_BIT(ISR_ROVR)); + } + + if (status & MACB_BIT(HRESP)) { + /* TODO: Reset the hardware, and maybe move the + * netdev_err to a lower-priority context as well + * (work queue?) + */ + netdev_err(dev, "DMA bus error: HRESP not OK\n"); + + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) + queue_writel(queue, ISR, MACB_BIT(HRESP)); + } + + status = queue_readl(queue, ISR); + } + + spin_unlock(&bp->lock); + + return IRQ_HANDLED; +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +/* Polling receive - used by netconsole and other diagnostic tools + * to allow network i/o with interrupts disabled. + */ +static void macb_poll_controller(struct net_device *dev) +{ + struct macb *bp = netdev_priv(dev); + struct macb_queue *queue; + unsigned long flags; + unsigned int q; + + local_irq_save(flags); + for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) + macb_interrupt(dev->irq, queue); + local_irq_restore(flags); +} +#endif + +static unsigned int macb_tx_map(struct macb *bp, + struct macb_queue *queue, + struct sk_buff *skb, + unsigned int hdrlen) +{ + dma_addr_t mapping; + unsigned int len, entry, i, tx_head = queue->tx_head; + struct macb_tx_skb *tx_skb = NULL; + struct macb_dma_desc *desc; + unsigned int offset, size, count = 0; + unsigned int f, nr_frags = skb_shinfo(skb)->nr_frags; + unsigned int eof = 1, mss_mfs = 0; + u32 ctrl, lso_ctrl = 0, seq_ctrl = 0; + + /* LSO */ + if (skb_shinfo(skb)->gso_size != 0) { + if (ip_hdr(skb)->protocol == IPPROTO_UDP) + /* UDP - UFO */ + lso_ctrl = MACB_LSO_UFO_ENABLE; + else + /* TCP - TSO */ + lso_ctrl = MACB_LSO_TSO_ENABLE; + } + + /* First, map non-paged data */ + len = skb_headlen(skb); + + /* first buffer length */ + size = hdrlen; + + offset = 0; + while (len) { + entry = macb_tx_ring_wrap(bp, tx_head); + tx_skb = &queue->tx_skb[entry]; + + mapping = dma_map_single(&bp->pdev->dev, + skb->data + offset, + size, DMA_TO_DEVICE); + if (dma_mapping_error(&bp->pdev->dev, mapping)) + goto dma_error; + + /* Save info to properly release resources */ + tx_skb->skb = NULL; + tx_skb->mapping = mapping; + tx_skb->size = size; + tx_skb->mapped_as_page = false; + + len -= size; + offset += size; + count++; + tx_head++; + + size = min(len, bp->max_tx_length); + } + + /* Then, map paged data from fragments */ + for (f = 0; f < nr_frags; f++) { + const skb_frag_t *frag = &skb_shinfo(skb)->frags[f]; + + len = skb_frag_size(frag); + offset = 0; + while (len) { + size = min(len, bp->max_tx_length); + entry = macb_tx_ring_wrap(bp, tx_head); + tx_skb = &queue->tx_skb[entry]; + + mapping = skb_frag_dma_map(&bp->pdev->dev, frag, + offset, size, DMA_TO_DEVICE); + if (dma_mapping_error(&bp->pdev->dev, mapping)) + goto dma_error; + + /* Save info to properly release resources */ + tx_skb->skb = NULL; + tx_skb->mapping = mapping; + tx_skb->size = size; + tx_skb->mapped_as_page = true; + + len -= size; + offset += size; + count++; + tx_head++; + } + } + + /* Should never happen */ + if (unlikely(!tx_skb)) { + netdev_err(bp->dev, "BUG! empty skb!\n"); + return 0; + } + + /* This is the last buffer of the frame: save socket buffer */ + tx_skb->skb = skb; + + /* Update TX ring: update buffer descriptors in reverse order + * to avoid race condition + */ + + /* Set 'TX_USED' bit in buffer descriptor at tx_head position + * to set the end of TX queue + */ + i = tx_head; + entry = macb_tx_ring_wrap(bp, i); + ctrl = MACB_BIT(TX_USED); + desc = macb_tx_desc(queue, entry); + desc->ctrl = ctrl; + + if (lso_ctrl) { + if (lso_ctrl == MACB_LSO_UFO_ENABLE) + /* include header and FCS in value given to h/w */ + mss_mfs = skb_shinfo(skb)->gso_size + + skb_transport_offset(skb) + + ETH_FCS_LEN; + else /* TSO */ { + mss_mfs = skb_shinfo(skb)->gso_size; + /* TCP Sequence Number Source Select + * can be set only for TSO + */ + seq_ctrl = 0; + } + } + + do { + i--; + entry = macb_tx_ring_wrap(bp, i); + tx_skb = &queue->tx_skb[entry]; + desc = macb_tx_desc(queue, entry); + + ctrl = (u32)tx_skb->size; + if (eof) { + ctrl |= MACB_BIT(TX_LAST); + eof = 0; + } + if (unlikely(entry == (bp->tx_ring_size - 1))) + ctrl |= MACB_BIT(TX_WRAP); + + /* First descriptor is header descriptor */ + if (i == queue->tx_head) { + ctrl |= MACB_BF(TX_LSO, lso_ctrl); + ctrl |= MACB_BF(TX_TCP_SEQ_SRC, seq_ctrl); + } else + /* Only set MSS/MFS on payload descriptors + * (second or later descriptor) + */ + ctrl |= MACB_BF(MSS_MFS, mss_mfs); + + /* Set TX buffer descriptor */ + macb_set_addr(bp, desc, tx_skb->mapping); + /* desc->addr must be visible to hardware before clearing + * 'TX_USED' bit in desc->ctrl. + */ + wmb(); + desc->ctrl = ctrl; + } while (i != queue->tx_head); + + queue->tx_head = tx_head; + + return count; + +dma_error: + netdev_err(bp->dev, "TX DMA map failed\n"); + + for (i = queue->tx_head; i != tx_head; i++) { + tx_skb = macb_tx_skb(queue, i); + + macb_tx_unmap(bp, tx_skb); + } + + return 0; +} + +static netdev_features_t macb_features_check(struct sk_buff *skb, + struct net_device *dev, + netdev_features_t features) +{ + unsigned int nr_frags, f; + unsigned int hdrlen; + + /* Validate LSO compatibility */ + + /* there is only one buffer */ + if (!skb_is_nonlinear(skb)) + return features; + + /* length of header */ + hdrlen = skb_transport_offset(skb); + if (ip_hdr(skb)->protocol == IPPROTO_TCP) + hdrlen += tcp_hdrlen(skb); + + /* For LSO: + * When software supplies two or more payload buffers all payload buffers + * apart from the last must be a multiple of 8 bytes in size. + */ + if (!IS_ALIGNED(skb_headlen(skb) - hdrlen, MACB_TX_LEN_ALIGN)) + return features & ~MACB_NETIF_LSO; + + nr_frags = skb_shinfo(skb)->nr_frags; + /* No need to check last fragment */ + nr_frags--; + for (f = 0; f < nr_frags; f++) { + const skb_frag_t *frag = &skb_shinfo(skb)->frags[f]; + + if (!IS_ALIGNED(skb_frag_size(frag), MACB_TX_LEN_ALIGN)) + return features & ~MACB_NETIF_LSO; + } + return features; +} + +static inline int macb_clear_csum(struct sk_buff *skb) +{ + /* no change for packets without checksum offloading */ + if (skb->ip_summed != CHECKSUM_PARTIAL) + return 0; + + /* make sure we can modify the header */ + if (unlikely(skb_cow_head(skb, 0))) + return -1; + + /* initialize checksum field + * This is required - at least for Zynq, which otherwise calculates + * wrong UDP header checksums for UDP packets with UDP data len <=2 + */ + *(__sum16 *)(skb_checksum_start(skb) + skb->csum_offset) = 0; + return 0; +} + +static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + u16 queue_index = skb_get_queue_mapping(skb); + struct macb *bp = netdev_priv(dev); + struct macb_queue *queue = &bp->queues[queue_index]; + unsigned long flags; + unsigned int desc_cnt, nr_frags, frag_size, f; + unsigned int hdrlen; + bool is_lso, is_udp = 0; + + is_lso = (skb_shinfo(skb)->gso_size != 0); + + if (is_lso) { + is_udp = !!(ip_hdr(skb)->protocol == IPPROTO_UDP); + + /* length of headers */ + if (is_udp) + /* only queue eth + ip headers separately for UDP */ + hdrlen = skb_transport_offset(skb); + else + hdrlen = skb_transport_offset(skb) + tcp_hdrlen(skb); + if (skb_headlen(skb) < hdrlen) { + netdev_err(bp->dev, "Error - LSO headers fragmented!!!\n"); + /* if this is required, would need to copy to single buffer */ + return NETDEV_TX_BUSY; + } + } else + hdrlen = min(skb_headlen(skb), bp->max_tx_length); + +#if defined(DEBUG) && defined(VERBOSE_DEBUG) + netdev_vdbg(bp->dev, + "start_xmit: queue %hu len %u head %p data %p tail %p end %p\n", + queue_index, skb->len, skb->head, skb->data, + skb_tail_pointer(skb), skb_end_pointer(skb)); + print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_OFFSET, 16, 1, + skb->data, 16, true); +#endif + + /* Count how many TX buffer descriptors are needed to send this + * socket buffer: skb fragments of jumbo frames may need to be + * split into many buffer descriptors. + */ + if (is_lso && (skb_headlen(skb) > hdrlen)) + /* extra header descriptor if also payload in first buffer */ + desc_cnt = DIV_ROUND_UP((skb_headlen(skb) - hdrlen), bp->max_tx_length) + 1; + else + desc_cnt = DIV_ROUND_UP(skb_headlen(skb), bp->max_tx_length); + nr_frags = skb_shinfo(skb)->nr_frags; + for (f = 0; f < nr_frags; f++) { + frag_size = skb_frag_size(&skb_shinfo(skb)->frags[f]); + desc_cnt += DIV_ROUND_UP(frag_size, bp->max_tx_length); + } + + spin_lock_irqsave(&bp->lock, flags); + + /* This is a hard error, log it. */ + if (CIRC_SPACE(queue->tx_head, queue->tx_tail, + bp->tx_ring_size) < desc_cnt) { + netif_stop_subqueue(dev, queue_index); + spin_unlock_irqrestore(&bp->lock, flags); + netdev_dbg(bp->dev, "tx_head = %u, tx_tail = %u\n", + queue->tx_head, queue->tx_tail); + return NETDEV_TX_BUSY; + } + + if (macb_clear_csum(skb)) { + dev_kfree_skb_any(skb); + goto unlock; + } + + /* Map socket buffer for DMA transfer */ + if (!macb_tx_map(bp, queue, skb, hdrlen)) { + dev_kfree_skb_any(skb); + goto unlock; + } + + /* Make newly initialized descriptor visible to hardware */ + wmb(); + + skb_tx_timestamp(skb); + + macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); + + if (CIRC_SPACE(queue->tx_head, queue->tx_tail, bp->tx_ring_size) < 1) + netif_stop_subqueue(dev, queue_index); + +unlock: + spin_unlock_irqrestore(&bp->lock, flags); + + return NETDEV_TX_OK; +} + +static void macb_init_rx_buffer_size(struct macb *bp, size_t size) +{ + if (!macb_is_gem(bp)) { + bp->rx_buffer_size = MACB_RX_BUFFER_SIZE; + } else { + bp->rx_buffer_size = size; + + if (bp->rx_buffer_size % RX_BUFFER_MULTIPLE) { + netdev_dbg(bp->dev, + "RX buffer must be multiple of %d bytes, expanding\n", + RX_BUFFER_MULTIPLE); + bp->rx_buffer_size = + roundup(bp->rx_buffer_size, RX_BUFFER_MULTIPLE); + } + } + + netdev_dbg(bp->dev, "mtu [%u] rx_buffer_size [%zu]\n", + bp->dev->mtu, bp->rx_buffer_size); +} + +static void gem_free_rx_buffers(struct macb *bp) +{ + struct sk_buff *skb; + struct macb_dma_desc *desc; + dma_addr_t addr; + int i; + + if (!bp->rx_skbuff) + return; + + for (i = 0; i < bp->rx_ring_size; i++) { + skb = bp->rx_skbuff[i]; + + if (!skb) + continue; + + desc = macb_rx_desc(bp, i); + addr = macb_get_addr(bp, desc); + + dma_unmap_single(&bp->pdev->dev, addr, bp->rx_buffer_size, + DMA_FROM_DEVICE); + dev_kfree_skb_any(skb); + skb = NULL; + } + + kfree(bp->rx_skbuff); + bp->rx_skbuff = NULL; +} + +static void macb_free_rx_buffers(struct macb *bp) +{ + if (bp->rx_buffers) { + dma_free_coherent(&bp->pdev->dev, + bp->rx_ring_size * bp->rx_buffer_size, + bp->rx_buffers, bp->rx_buffers_dma); + bp->rx_buffers = NULL; + } +} + +static void macb_free_consistent(struct macb *bp) +{ + struct macb_queue *queue; + unsigned int q; + + bp->macbgem_ops.mog_free_rx_buffers(bp); + if (bp->rx_ring) { + dma_free_coherent(&bp->pdev->dev, RX_RING_BYTES(bp), + bp->rx_ring, bp->rx_ring_dma); + bp->rx_ring = NULL; + } + + for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { + kfree(queue->tx_skb); + queue->tx_skb = NULL; + if (queue->tx_ring) { + dma_free_coherent(&bp->pdev->dev, TX_RING_BYTES(bp), + queue->tx_ring, queue->tx_ring_dma); + queue->tx_ring = NULL; + } + } +} + +static int gem_alloc_rx_buffers(struct macb *bp) +{ + int size; + + size = bp->rx_ring_size * sizeof(struct sk_buff *); + bp->rx_skbuff = kzalloc(size, GFP_KERNEL); + if (!bp->rx_skbuff) + return -ENOMEM; + else + netdev_dbg(bp->dev, + "Allocated %d RX struct sk_buff entries at %p\n", + bp->rx_ring_size, bp->rx_skbuff); + return 0; +} + +static int macb_alloc_rx_buffers(struct macb *bp) +{ + int size; + + size = bp->rx_ring_size * bp->rx_buffer_size; + bp->rx_buffers = dma_alloc_coherent(&bp->pdev->dev, size, + &bp->rx_buffers_dma, GFP_KERNEL); + if (!bp->rx_buffers) + return -ENOMEM; + + netdev_dbg(bp->dev, + "Allocated RX buffers of %d bytes at %08lx (mapped %p)\n", + size, (unsigned long)bp->rx_buffers_dma, bp->rx_buffers); + return 0; +} + +static int macb_alloc_consistent(struct macb *bp) +{ + struct macb_queue *queue; + unsigned int q; + int size; + + for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { + size = TX_RING_BYTES(bp); + queue->tx_ring = dma_alloc_coherent(&bp->pdev->dev, size, + &queue->tx_ring_dma, + GFP_KERNEL); + if (!queue->tx_ring) + goto out_err; + netdev_dbg(bp->dev, + "Allocated TX ring for queue %u of %d bytes at %08lx (mapped %p)\n", + q, size, (unsigned long)queue->tx_ring_dma, + queue->tx_ring); + + size = bp->tx_ring_size * sizeof(struct macb_tx_skb); + queue->tx_skb = kmalloc(size, GFP_KERNEL); + if (!queue->tx_skb) + goto out_err; + } + + size = RX_RING_BYTES(bp); + bp->rx_ring = dma_alloc_coherent(&bp->pdev->dev, size, + &bp->rx_ring_dma, GFP_KERNEL); + if (!bp->rx_ring) + goto out_err; + netdev_dbg(bp->dev, + "Allocated RX ring of %d bytes at %08lx (mapped %p)\n", + size, (unsigned long)bp->rx_ring_dma, bp->rx_ring); + + if (bp->macbgem_ops.mog_alloc_rx_buffers(bp)) + goto out_err; + + return 0; + +out_err: + macb_free_consistent(bp); + return -ENOMEM; +} + +static void gem_init_rings(struct macb *bp) +{ + struct macb_queue *queue; + struct macb_dma_desc *desc = NULL; + unsigned int q; + int i; + + for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { + for (i = 0; i < bp->tx_ring_size; i++) { + desc = macb_tx_desc(queue, i); + macb_set_addr(bp, desc, 0); + desc->ctrl = MACB_BIT(TX_USED); + } + desc->ctrl |= MACB_BIT(TX_WRAP); + queue->tx_head = 0; + queue->tx_tail = 0; + } + + bp->rx_tail = 0; + bp->rx_prepared_head = 0; + + gem_rx_refill(bp); +} + +static void macb_init_rings(struct macb *bp) +{ + int i; + struct macb_dma_desc *desc = NULL; + + macb_init_rx_ring(bp); + + for (i = 0; i < bp->tx_ring_size; i++) { + desc = macb_tx_desc(&bp->queues[0], i); + macb_set_addr(bp, desc, 0); + desc->ctrl = MACB_BIT(TX_USED); + } + bp->queues[0].tx_head = 0; + bp->queues[0].tx_tail = 0; + desc->ctrl |= MACB_BIT(TX_WRAP); +} + +static void macb_reset_hw(struct macb *bp) +{ + struct macb_queue *queue; + unsigned int q; + + /* Disable RX and TX (XXX: Should we halt the transmission + * more gracefully?) + */ + macb_writel(bp, NCR, 0); + + /* Clear the stats registers (XXX: Update stats first?) */ + macb_writel(bp, NCR, MACB_BIT(CLRSTAT)); + + /* Clear all status flags */ + macb_writel(bp, TSR, -1); + macb_writel(bp, RSR, -1); + + /* Disable all interrupts */ + for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { + queue_writel(queue, IDR, -1); + queue_readl(queue, ISR); + if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) + queue_writel(queue, ISR, -1); + } +} + +static u32 gem_mdc_clk_div(struct macb *bp) +{ + u32 config; + unsigned long pclk_hz = clk_get_rate(bp->pclk); + + if (pclk_hz <= 20000000) + config = GEM_BF(CLK, GEM_CLK_DIV8); + else if (pclk_hz <= 40000000) + config = GEM_BF(CLK, GEM_CLK_DIV16); + else if (pclk_hz <= 80000000) + config = GEM_BF(CLK, GEM_CLK_DIV32); + else if (pclk_hz <= 120000000) + config = GEM_BF(CLK, GEM_CLK_DIV48); + else if (pclk_hz <= 160000000) + config = GEM_BF(CLK, GEM_CLK_DIV64); + else + config = GEM_BF(CLK, GEM_CLK_DIV96); + + return config; +} + +static u32 macb_mdc_clk_div(struct macb *bp) +{ + u32 config; + unsigned long pclk_hz; + + if (macb_is_gem(bp)) + return gem_mdc_clk_div(bp); + + pclk_hz = clk_get_rate(bp->pclk); + if (pclk_hz <= 20000000) + config = MACB_BF(CLK, MACB_CLK_DIV8); + else if (pclk_hz <= 40000000) + config = MACB_BF(CLK, MACB_CLK_DIV16); + else if (pclk_hz <= 80000000) + config = MACB_BF(CLK, MACB_CLK_DIV32); + else + config = MACB_BF(CLK, MACB_CLK_DIV64); + + return config; +} + +/* Get the DMA bus width field of the network configuration register that we + * should program. We find the width from decoding the design configuration + * register to find the maximum supported data bus width. + */ +static u32 macb_dbw(struct macb *bp) +{ + if (!macb_is_gem(bp)) + return 0; + + switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) { + case 4: + return GEM_BF(DBW, GEM_DBW128); + case 2: + return GEM_BF(DBW, GEM_DBW64); + case 1: + default: + return GEM_BF(DBW, GEM_DBW32); + } +} + +/* Configure the receive DMA engine + * - use the correct receive buffer size + * - set best burst length for DMA operations + * (if not supported by FIFO, it will fallback to default) + * - set both rx/tx packet buffers to full memory size + * These are configurable parameters for GEM. + */ +static void macb_configure_dma(struct macb *bp) +{ + u32 dmacfg; + + if (macb_is_gem(bp)) { + dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L); + dmacfg |= GEM_BF(RXBS, bp->rx_buffer_size / RX_BUFFER_MULTIPLE); + if (bp->dma_burst_length) + dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg); + dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L); + dmacfg &= ~GEM_BIT(ENDIA_PKT); + + if (bp->native_io) + dmacfg &= ~GEM_BIT(ENDIA_DESC); + else + dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */ + + if (bp->dev->features & NETIF_F_HW_CSUM) + dmacfg |= GEM_BIT(TXCOEN); + else + dmacfg &= ~GEM_BIT(TXCOEN); + +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (bp->hw_dma_cap & HW_DMA_CAP_64B) + dmacfg |= GEM_BIT(ADDR64); +#endif +#ifdef CONFIG_MACB_USE_HWSTAMP + if (bp->hw_dma_cap & HW_DMA_CAP_PTP) + dmacfg |= GEM_BIT(RXEXT) | GEM_BIT(TXEXT); +#endif + netdev_dbg(bp->dev, "Cadence configure DMA with 0x%08x\n", + dmacfg); + gem_writel(bp, DMACFG, dmacfg); + } +} + +static void macb_init_hw(struct macb *bp) +{ + struct macb_queue *queue; + unsigned int q; + + u32 config; + + macb_reset_hw(bp); + macb_set_hwaddr(bp); + + config = macb_mdc_clk_div(bp); + if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) + config |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL); + config |= MACB_BF(RBOF, NET_IP_ALIGN); /* Make eth data aligned */ + config |= MACB_BIT(PAE); /* PAuse Enable */ + config |= MACB_BIT(DRFCS); /* Discard Rx FCS */ + if (bp->caps & MACB_CAPS_JUMBO) + config |= MACB_BIT(JFRAME); /* Enable jumbo frames */ + else + config |= MACB_BIT(BIG); /* Receive oversized frames */ + if (bp->dev->flags & IFF_PROMISC) + config |= MACB_BIT(CAF); /* Copy All Frames */ + else if (macb_is_gem(bp) && bp->dev->features & NETIF_F_RXCSUM) + config |= GEM_BIT(RXCOEN); + if (!(bp->dev->flags & IFF_BROADCAST)) + config |= MACB_BIT(NBC); /* No BroadCast */ + config |= macb_dbw(bp); + macb_writel(bp, NCFGR, config); + if ((bp->caps & MACB_CAPS_JUMBO) && bp->jumbo_max_len) + gem_writel(bp, JML, bp->jumbo_max_len); + bp->speed = SPEED_10; + bp->duplex = DUPLEX_HALF; + bp->rx_frm_len_mask = MACB_RX_FRMLEN_MASK; + if (bp->caps & MACB_CAPS_JUMBO) + bp->rx_frm_len_mask = MACB_RX_JFRMLEN_MASK; + + macb_configure_dma(bp); + + /* Initialize TX and RX buffers */ + macb_writel(bp, RBQP, lower_32_bits(bp->rx_ring_dma)); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (bp->hw_dma_cap & HW_DMA_CAP_64B) + macb_writel(bp, RBQPH, upper_32_bits(bp->rx_ring_dma)); +#endif + for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) { + queue_writel(queue, TBQP, lower_32_bits(queue->tx_ring_dma)); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (bp->hw_dma_cap & HW_DMA_CAP_64B) + queue_writel(queue, TBQPH, upper_32_bits(queue->tx_ring_dma)); +#endif + + /* Enable interrupts */ + queue_writel(queue, IER, + MACB_RX_INT_FLAGS | + MACB_TX_INT_FLAGS | + MACB_BIT(HRESP)); + } + + /* Enable TX and RX */ + macb_writel(bp, NCR, MACB_BIT(RE) | MACB_BIT(TE) | MACB_BIT(MPE)); +} + +/* The hash address register is 64 bits long and takes up two + * locations in the memory map. The least significant bits are stored + * in EMAC_HSL and the most significant bits in EMAC_HSH. + * + * The unicast hash enable and the multicast hash enable bits in the + * network configuration register enable the reception of hash matched + * frames. The destination address is reduced to a 6 bit index into + * the 64 bit hash register using the following hash function. The + * hash function is an exclusive or of every sixth bit of the + * destination address. + * + * hi[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47] + * hi[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46] + * hi[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45] + * hi[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44] + * hi[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43] + * hi[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42] + * + * da[0] represents the least significant bit of the first byte + * received, that is, the multicast/unicast indicator, and da[47] + * represents the most significant bit of the last byte received. If + * the hash index, hi[n], points to a bit that is set in the hash + * register then the frame will be matched according to whether the + * frame is multicast or unicast. A multicast match will be signalled + * if the multicast hash enable bit is set, da[0] is 1 and the hash + * index points to a bit set in the hash register. A unicast match + * will be signalled if the unicast hash enable bit is set, da[0] is 0 + * and the hash index points to a bit set in the hash register. To + * receive all multicast frames, the hash register should be set with + * all ones and the multicast hash enable bit should be set in the + * network configuration register. + */ + +static inline int hash_bit_value(int bitnr, __u8 *addr) +{ + if (addr[bitnr / 8] & (1 << (bitnr % 8))) + return 1; + return 0; +} + +/* Return the hash index value for the specified address. */ +static int hash_get_index(__u8 *addr) +{ + int i, j, bitval; + int hash_index = 0; + + for (j = 0; j < 6; j++) { + for (i = 0, bitval = 0; i < 8; i++) + bitval ^= hash_bit_value(i * 6 + j, addr); + + hash_index |= (bitval << j); + } + + return hash_index; +} + +/* Add multicast addresses to the internal multicast-hash table. */ +static void macb_sethashtable(struct net_device *dev) +{ + struct netdev_hw_addr *ha; + unsigned long mc_filter[2]; + unsigned int bitnr; + struct macb *bp = netdev_priv(dev); + + mc_filter[0] = 0; + mc_filter[1] = 0; + + netdev_for_each_mc_addr(ha, dev) { + bitnr = hash_get_index(ha->addr); + mc_filter[bitnr >> 5] |= 1 << (bitnr & 31); + } + + macb_or_gem_writel(bp, HRB, mc_filter[0]); + macb_or_gem_writel(bp, HRT, mc_filter[1]); +} + +/* Enable/Disable promiscuous and multicast modes. */ +static void macb_set_rx_mode(struct net_device *dev) +{ + unsigned long cfg; + struct macb *bp = netdev_priv(dev); + + cfg = macb_readl(bp, NCFGR); + + if (dev->flags & IFF_PROMISC) { + /* Enable promiscuous mode */ + cfg |= MACB_BIT(CAF); + + /* Disable RX checksum offload */ + if (macb_is_gem(bp)) + cfg &= ~GEM_BIT(RXCOEN); + } else { + /* Disable promiscuous mode */ + cfg &= ~MACB_BIT(CAF); + + /* Enable RX checksum offload only if requested */ + if (macb_is_gem(bp) && dev->features & NETIF_F_RXCSUM) + cfg |= GEM_BIT(RXCOEN); + } + + if (dev->flags & IFF_ALLMULTI) { + /* Enable all multicast mode */ + macb_or_gem_writel(bp, HRB, -1); + macb_or_gem_writel(bp, HRT, -1); + cfg |= MACB_BIT(NCFGR_MTI); + } else if (!netdev_mc_empty(dev)) { + /* Enable specific multicasts */ + macb_sethashtable(dev); + cfg |= MACB_BIT(NCFGR_MTI); + } else if (dev->flags & (~IFF_ALLMULTI)) { + /* Disable all multicast mode */ + macb_or_gem_writel(bp, HRB, 0); + macb_or_gem_writel(bp, HRT, 0); + cfg &= ~MACB_BIT(NCFGR_MTI); + } + + macb_writel(bp, NCFGR, cfg); +} + +static int macb_open(struct net_device *dev) +{ + struct macb *bp = netdev_priv(dev); + size_t bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN; + int err; + + netdev_dbg(bp->dev, "open\n"); + + /* carrier starts down */ + netif_carrier_off(dev); + + /* if the phy is not yet register, retry later*/ + if (!dev->phydev) + return -EAGAIN; + + /* RX buffers initialization */ + macb_init_rx_buffer_size(bp, bufsz); + + err = macb_alloc_consistent(bp); + if (err) { + netdev_err(dev, "Unable to allocate DMA memory (error %d)\n", + err); + return err; + } + + napi_enable(&bp->napi); + + bp->macbgem_ops.mog_init_rings(bp); + macb_init_hw(bp); + + /* schedule a link state check */ + phy_start(dev->phydev); + + netif_tx_start_all_queues(dev); + + if (bp->ptp_info) + bp->ptp_info->ptp_init(dev); + + return 0; +} + +static int macb_close(struct net_device *dev) +{ + struct macb *bp = netdev_priv(dev); + unsigned long flags; + + netif_tx_stop_all_queues(dev); + napi_disable(&bp->napi); + + if (dev->phydev) + phy_stop(dev->phydev); + + spin_lock_irqsave(&bp->lock, flags); + macb_reset_hw(bp); + netif_carrier_off(dev); + spin_unlock_irqrestore(&bp->lock, flags); + + macb_free_consistent(bp); + + if (bp->ptp_info) + bp->ptp_info->ptp_remove(dev); + + return 0; +} + +static int macb_change_mtu(struct net_device *dev, int new_mtu) +{ + if (netif_running(dev)) + return -EBUSY; + + dev->mtu = new_mtu; + + return 0; +} + +static void gem_update_stats(struct macb *bp) +{ + unsigned int i; + u32 *p = &bp->hw_stats.gem.tx_octets_31_0; + + for (i = 0; i < GEM_STATS_LEN; ++i, ++p) { + u32 offset = gem_statistics[i].offset; + u64 val = bp->macb_reg_readl(bp, offset); + + bp->ethtool_stats[i] += val; + *p += val; + + if (offset == GEM_OCTTXL || offset == GEM_OCTRXL) { + /* Add GEM_OCTTXH, GEM_OCTRXH */ + val = bp->macb_reg_readl(bp, offset + 4); + bp->ethtool_stats[i] += ((u64)val) << 32; + *(++p) += val; + } + } +} + +static struct net_device_stats *gem_get_stats(struct macb *bp) +{ + struct gem_stats *hwstat = &bp->hw_stats.gem; + struct net_device_stats *nstat = &bp->dev->stats; + + gem_update_stats(bp); + + nstat->rx_errors = (hwstat->rx_frame_check_sequence_errors + + hwstat->rx_alignment_errors + + hwstat->rx_resource_errors + + hwstat->rx_overruns + + hwstat->rx_oversize_frames + + hwstat->rx_jabbers + + hwstat->rx_undersized_frames + + hwstat->rx_length_field_frame_errors); + nstat->tx_errors = (hwstat->tx_late_collisions + + hwstat->tx_excessive_collisions + + hwstat->tx_underrun + + hwstat->tx_carrier_sense_errors); + nstat->multicast = hwstat->rx_multicast_frames; + nstat->collisions = (hwstat->tx_single_collision_frames + + hwstat->tx_multiple_collision_frames + + hwstat->tx_excessive_collisions); + nstat->rx_length_errors = (hwstat->rx_oversize_frames + + hwstat->rx_jabbers + + hwstat->rx_undersized_frames + + hwstat->rx_length_field_frame_errors); + nstat->rx_over_errors = hwstat->rx_resource_errors; + nstat->rx_crc_errors = hwstat->rx_frame_check_sequence_errors; + nstat->rx_frame_errors = hwstat->rx_alignment_errors; + nstat->rx_fifo_errors = hwstat->rx_overruns; + nstat->tx_aborted_errors = hwstat->tx_excessive_collisions; + nstat->tx_carrier_errors = hwstat->tx_carrier_sense_errors; + nstat->tx_fifo_errors = hwstat->tx_underrun; + + return nstat; +} + +static void gem_get_ethtool_stats(struct net_device *dev, + struct ethtool_stats *stats, u64 *data) +{ + struct macb *bp; + + bp = netdev_priv(dev); + gem_update_stats(bp); + memcpy(data, &bp->ethtool_stats, sizeof(u64) * GEM_STATS_LEN); +} + +static int gem_get_sset_count(struct net_device *dev, int sset) +{ + switch (sset) { + case ETH_SS_STATS: + return GEM_STATS_LEN; + default: + return -EOPNOTSUPP; + } +} + +static void gem_get_ethtool_strings(struct net_device *dev, u32 sset, u8 *p) +{ + unsigned int i; + + switch (sset) { + case ETH_SS_STATS: + for (i = 0; i < GEM_STATS_LEN; i++, p += ETH_GSTRING_LEN) + memcpy(p, gem_statistics[i].stat_string, + ETH_GSTRING_LEN); + break; + } +} + +static struct net_device_stats *macb_get_stats(struct net_device *dev) +{ + struct macb *bp = netdev_priv(dev); + struct net_device_stats *nstat = &bp->dev->stats; + struct macb_stats *hwstat = &bp->hw_stats.macb; + + if (macb_is_gem(bp)) + return gem_get_stats(bp); + + /* read stats from hardware */ + macb_update_stats(bp); + + /* Convert HW stats into netdevice stats */ + nstat->rx_errors = (hwstat->rx_fcs_errors + + hwstat->rx_align_errors + + hwstat->rx_resource_errors + + hwstat->rx_overruns + + hwstat->rx_oversize_pkts + + hwstat->rx_jabbers + + hwstat->rx_undersize_pkts + + hwstat->rx_length_mismatch); + nstat->tx_errors = (hwstat->tx_late_cols + + hwstat->tx_excessive_cols + + hwstat->tx_underruns + + hwstat->tx_carrier_errors + + hwstat->sqe_test_errors); + nstat->collisions = (hwstat->tx_single_cols + + hwstat->tx_multiple_cols + + hwstat->tx_excessive_cols); + nstat->rx_length_errors = (hwstat->rx_oversize_pkts + + hwstat->rx_jabbers + + hwstat->rx_undersize_pkts + + hwstat->rx_length_mismatch); + nstat->rx_over_errors = hwstat->rx_resource_errors + + hwstat->rx_overruns; + nstat->rx_crc_errors = hwstat->rx_fcs_errors; + nstat->rx_frame_errors = hwstat->rx_align_errors; + nstat->rx_fifo_errors = hwstat->rx_overruns; + /* XXX: What does "missed" mean? */ + nstat->tx_aborted_errors = hwstat->tx_excessive_cols; + nstat->tx_carrier_errors = hwstat->tx_carrier_errors; + nstat->tx_fifo_errors = hwstat->tx_underruns; + /* Don't know about heartbeat or window errors... */ + + return nstat; +} + +static int macb_get_regs_len(struct net_device *netdev) +{ + return MACB_GREGS_NBR * sizeof(u32); +} + +static void macb_get_regs(struct net_device *dev, struct ethtool_regs *regs, + void *p) +{ + struct macb *bp = netdev_priv(dev); + unsigned int tail, head; + u32 *regs_buff = p; + + regs->version = (macb_readl(bp, MID) & ((1 << MACB_REV_SIZE) - 1)) + | MACB_GREGS_VERSION; + + tail = macb_tx_ring_wrap(bp, bp->queues[0].tx_tail); + head = macb_tx_ring_wrap(bp, bp->queues[0].tx_head); + + regs_buff[0] = macb_readl(bp, NCR); + regs_buff[1] = macb_or_gem_readl(bp, NCFGR); + regs_buff[2] = macb_readl(bp, NSR); + regs_buff[3] = macb_readl(bp, TSR); + regs_buff[4] = macb_readl(bp, RBQP); + regs_buff[5] = macb_readl(bp, TBQP); + regs_buff[6] = macb_readl(bp, RSR); + regs_buff[7] = macb_readl(bp, IMR); + + regs_buff[8] = tail; + regs_buff[9] = head; + regs_buff[10] = macb_tx_dma(&bp->queues[0], tail); + regs_buff[11] = macb_tx_dma(&bp->queues[0], head); + + if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) + regs_buff[12] = macb_or_gem_readl(bp, USRIO); + if (macb_is_gem(bp)) + regs_buff[13] = gem_readl(bp, DMACFG); +} + +static void macb_get_wol(struct net_device *netdev, struct ethtool_wolinfo *wol) +{ + struct macb *bp = netdev_priv(netdev); + + wol->supported = 0; + wol->wolopts = 0; + + if (bp->wol & MACB_WOL_HAS_MAGIC_PACKET) { + wol->supported = WAKE_MAGIC; + + if (bp->wol & MACB_WOL_ENABLED) + wol->wolopts |= WAKE_MAGIC; + } +} + +static int macb_set_wol(struct net_device *netdev, struct ethtool_wolinfo *wol) +{ + struct macb *bp = netdev_priv(netdev); + + if (!(bp->wol & MACB_WOL_HAS_MAGIC_PACKET) || + (wol->wolopts & ~WAKE_MAGIC)) + return -EOPNOTSUPP; + + if (wol->wolopts & WAKE_MAGIC) + bp->wol |= MACB_WOL_ENABLED; + else + bp->wol &= ~MACB_WOL_ENABLED; + + device_set_wakeup_enable(&bp->pdev->dev, bp->wol & MACB_WOL_ENABLED); + + return 0; +} + +static void macb_get_ringparam(struct net_device *netdev, + struct ethtool_ringparam *ring) +{ + struct macb *bp = netdev_priv(netdev); + + ring->rx_max_pending = MAX_RX_RING_SIZE; + ring->tx_max_pending = MAX_TX_RING_SIZE; + + ring->rx_pending = bp->rx_ring_size; + ring->tx_pending = bp->tx_ring_size; +} + +static int macb_set_ringparam(struct net_device *netdev, + struct ethtool_ringparam *ring) +{ + struct macb *bp = netdev_priv(netdev); + u32 new_rx_size, new_tx_size; + unsigned int reset = 0; + + if ((ring->rx_mini_pending) || (ring->rx_jumbo_pending)) + return -EINVAL; + + new_rx_size = clamp_t(u32, ring->rx_pending, + MIN_RX_RING_SIZE, MAX_RX_RING_SIZE); + new_rx_size = roundup_pow_of_two(new_rx_size); + + new_tx_size = clamp_t(u32, ring->tx_pending, + MIN_TX_RING_SIZE, MAX_TX_RING_SIZE); + new_tx_size = roundup_pow_of_two(new_tx_size); + + if ((new_tx_size == bp->tx_ring_size) && + (new_rx_size == bp->rx_ring_size)) { + /* nothing to do */ + return 0; + } + + if (netif_running(bp->dev)) { + reset = 1; + macb_close(bp->dev); + } + + bp->rx_ring_size = new_rx_size; + bp->tx_ring_size = new_tx_size; + + if (reset) + macb_open(bp->dev); + + return 0; +} + +static int macb_get_ts_info(struct net_device *netdev, + struct ethtool_ts_info *info) +{ + struct macb *bp = netdev_priv(netdev); + + if (bp->ptp_info) + return bp->ptp_info->get_ts_info(netdev, info); + + return ethtool_op_get_ts_info(netdev, info); +} + +static const struct ethtool_ops macb_ethtool_ops = { + .get_regs_len = macb_get_regs_len, + .get_regs = macb_get_regs, + .get_link = ethtool_op_get_link, + .get_ts_info = ethtool_op_get_ts_info, + .get_wol = macb_get_wol, + .set_wol = macb_set_wol, + .get_link_ksettings = phy_ethtool_get_link_ksettings, + .set_link_ksettings = phy_ethtool_set_link_ksettings, + .get_ringparam = macb_get_ringparam, + .set_ringparam = macb_set_ringparam, +}; + +static const struct ethtool_ops gem_ethtool_ops = { + .get_regs_len = macb_get_regs_len, + .get_regs = macb_get_regs, + .get_link = ethtool_op_get_link, + .get_ts_info = macb_get_ts_info, + .get_ethtool_stats = gem_get_ethtool_stats, + .get_strings = gem_get_ethtool_strings, + .get_sset_count = gem_get_sset_count, + .get_link_ksettings = phy_ethtool_get_link_ksettings, + .set_link_ksettings = phy_ethtool_set_link_ksettings, + .get_ringparam = macb_get_ringparam, + .set_ringparam = macb_set_ringparam, +}; + +static int macb_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) +{ + struct phy_device *phydev = dev->phydev; + struct macb *bp = netdev_priv(dev); + + if (!netif_running(dev)) + return -EINVAL; + + if (!phydev) + return -ENODEV; + + if (!bp->ptp_info) + return phy_mii_ioctl(phydev, rq, cmd); + + switch (cmd) { + case SIOCSHWTSTAMP: + return bp->ptp_info->set_hwtst(dev, rq, cmd); + case SIOCGHWTSTAMP: + return bp->ptp_info->get_hwtst(dev, rq); + default: + return phy_mii_ioctl(phydev, rq, cmd); + } +} + +static int macb_set_features(struct net_device *netdev, + netdev_features_t features) +{ + struct macb *bp = netdev_priv(netdev); + netdev_features_t changed = features ^ netdev->features; + + /* TX checksum offload */ + if ((changed & NETIF_F_HW_CSUM) && macb_is_gem(bp)) { + u32 dmacfg; + + dmacfg = gem_readl(bp, DMACFG); + if (features & NETIF_F_HW_CSUM) + dmacfg |= GEM_BIT(TXCOEN); + else + dmacfg &= ~GEM_BIT(TXCOEN); + gem_writel(bp, DMACFG, dmacfg); + } + + /* RX checksum offload */ + if ((changed & NETIF_F_RXCSUM) && macb_is_gem(bp)) { + u32 netcfg; + + netcfg = gem_readl(bp, NCFGR); + if (features & NETIF_F_RXCSUM && + !(netdev->flags & IFF_PROMISC)) + netcfg |= GEM_BIT(RXCOEN); + else + netcfg &= ~GEM_BIT(RXCOEN); + gem_writel(bp, NCFGR, netcfg); + } + + return 0; +} + +static const struct net_device_ops macb_netdev_ops = { + .ndo_open = macb_open, + .ndo_stop = macb_close, + .ndo_start_xmit = macb_start_xmit, + .ndo_set_rx_mode = macb_set_rx_mode, + .ndo_get_stats = macb_get_stats, + .ndo_do_ioctl = macb_ioctl, + .ndo_validate_addr = eth_validate_addr, + .ndo_change_mtu = macb_change_mtu, + .ndo_set_mac_address = eth_mac_addr, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = macb_poll_controller, +#endif + .ndo_set_features = macb_set_features, + .ndo_features_check = macb_features_check, +}; + +/* Configure peripheral capabilities according to device tree + * and integration options used + */ +static void macb_configure_caps(struct macb *bp, + const struct macb_config *dt_conf) +{ + u32 dcfg; + + if (dt_conf) + bp->caps = dt_conf->caps; + + if (hw_is_gem(bp->regs, bp->native_io)) { + bp->caps |= MACB_CAPS_MACB_IS_GEM; + + dcfg = gem_readl(bp, DCFG1); + if (GEM_BFEXT(IRQCOR, dcfg) == 0) + bp->caps |= MACB_CAPS_ISR_CLEAR_ON_WRITE; + dcfg = gem_readl(bp, DCFG2); + if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0) + bp->caps |= MACB_CAPS_FIFO_MODE; + if (IS_ENABLED(CONFIG_MACB_USE_HWSTAMP) && gem_has_ptp(bp)) { + if (!GEM_BFEXT(TSU, gem_readl(bp, DCFG5))) + pr_err("GEM doesn't support hardware ptp.\n"); + else + bp->hw_dma_cap |= HW_DMA_CAP_PTP; + } + } + + dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps); +} + +static void macb_probe_queues(void __iomem *mem, + bool native_io, + unsigned int *queue_mask, + unsigned int *num_queues) +{ + unsigned int hw_q; + + *queue_mask = 0x1; + *num_queues = 1; + + /* is it macb or gem ? + * + * We need to read directly from the hardware here because + * we are early in the probe process and don't have the + * MACB_CAPS_MACB_IS_GEM flag positioned + */ + if (!hw_is_gem(mem, native_io)) + return; + + /* bit 0 is never set but queue 0 always exists */ + *queue_mask = readl_relaxed(mem + GEM_DCFG6) & 0xff; + + *queue_mask |= 0x1; + + for (hw_q = 1; hw_q < MACB_MAX_QUEUES; ++hw_q) + if (*queue_mask & (1 << hw_q)) + (*num_queues)++; +} + +static int macb_clk_init(struct platform_device *pdev, struct clk **pclk, + struct clk **hclk, struct clk **tx_clk, + struct clk **rx_clk) +{ + struct macb_platform_data *pdata; + int err; + + pdata = dev_get_platdata(&pdev->dev); + if (pdata) { + *pclk = pdata->pclk; + *hclk = pdata->hclk; + } else { + *pclk = devm_clk_get(&pdev->dev, "pclk"); + *hclk = devm_clk_get(&pdev->dev, "hclk"); + } + + if (IS_ERR(*pclk)) { + err = PTR_ERR(*pclk); + dev_err(&pdev->dev, "failed to get macb_clk (%u)\n", err); + return err; + } + + if (IS_ERR(*hclk)) { + err = PTR_ERR(*hclk); + dev_err(&pdev->dev, "failed to get hclk (%u)\n", err); + return err; + } + + *tx_clk = devm_clk_get(&pdev->dev, "tx_clk"); + if (IS_ERR(*tx_clk)) + *tx_clk = NULL; + + *rx_clk = devm_clk_get(&pdev->dev, "rx_clk"); + if (IS_ERR(*rx_clk)) + *rx_clk = NULL; + + err = clk_prepare_enable(*pclk); + if (err) { + dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err); + return err; + } + + err = clk_prepare_enable(*hclk); + if (err) { + dev_err(&pdev->dev, "failed to enable hclk (%u)\n", err); + goto err_disable_pclk; + } + + err = clk_prepare_enable(*tx_clk); + if (err) { + dev_err(&pdev->dev, "failed to enable tx_clk (%u)\n", err); + goto err_disable_hclk; + } + + err = clk_prepare_enable(*rx_clk); + if (err) { + dev_err(&pdev->dev, "failed to enable rx_clk (%u)\n", err); + goto err_disable_txclk; + } + + return 0; + +err_disable_txclk: + clk_disable_unprepare(*tx_clk); + +err_disable_hclk: + clk_disable_unprepare(*hclk); + +err_disable_pclk: + clk_disable_unprepare(*pclk); + + return err; +} + +static int macb_init(struct platform_device *pdev) +{ + struct net_device *dev = platform_get_drvdata(pdev); + unsigned int hw_q, q; + struct macb *bp = netdev_priv(dev); + struct macb_queue *queue; + int err; + u32 val; + + bp->tx_ring_size = DEFAULT_TX_RING_SIZE; + bp->rx_ring_size = DEFAULT_RX_RING_SIZE; + + /* set the queue register mapping once for all: queue0 has a special + * register mapping but we don't want to test the queue index then + * compute the corresponding register offset at run time. + */ + for (hw_q = 0, q = 0; hw_q < MACB_MAX_QUEUES; ++hw_q) { + if (!(bp->queue_mask & (1 << hw_q))) + continue; + + queue = &bp->queues[q]; + queue->bp = bp; + if (hw_q) { + queue->ISR = GEM_ISR(hw_q - 1); + queue->IER = GEM_IER(hw_q - 1); + queue->IDR = GEM_IDR(hw_q - 1); + queue->IMR = GEM_IMR(hw_q - 1); + queue->TBQP = GEM_TBQP(hw_q - 1); +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (bp->hw_dma_cap & HW_DMA_CAP_64B) + queue->TBQPH = GEM_TBQPH(hw_q - 1); +#endif + } else { + /* queue0 uses legacy registers */ + queue->ISR = MACB_ISR; + queue->IER = MACB_IER; + queue->IDR = MACB_IDR; + queue->IMR = MACB_IMR; + queue->TBQP = MACB_TBQP; +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (bp->hw_dma_cap & HW_DMA_CAP_64B) + queue->TBQPH = MACB_TBQPH; +#endif + } + + /* get irq: here we use the linux queue index, not the hardware + * queue index. the queue irq definitions in the device tree + * must remove the optional gaps that could exist in the + * hardware queue mask. + */ + queue->irq = platform_get_irq(pdev, q); + err = devm_request_irq(&pdev->dev, queue->irq, macb_interrupt, + IRQF_SHARED, dev->name, queue); + if (err) { + dev_err(&pdev->dev, + "Unable to request IRQ %d (error %d)\n", + queue->irq, err); + return err; + } + + INIT_WORK(&queue->tx_error_task, macb_tx_error_task); + q++; + } + + dev->netdev_ops = &macb_netdev_ops; + netif_napi_add(dev, &bp->napi, macb_poll, 64); + + /* setup appropriated routines according to adapter type */ + if (macb_is_gem(bp)) { + bp->max_tx_length = GEM_MAX_TX_LEN; + bp->macbgem_ops.mog_alloc_rx_buffers = gem_alloc_rx_buffers; + bp->macbgem_ops.mog_free_rx_buffers = gem_free_rx_buffers; + bp->macbgem_ops.mog_init_rings = gem_init_rings; + bp->macbgem_ops.mog_rx = gem_rx; + dev->ethtool_ops = &gem_ethtool_ops; + } else { + bp->max_tx_length = MACB_MAX_TX_LEN; + bp->macbgem_ops.mog_alloc_rx_buffers = macb_alloc_rx_buffers; + bp->macbgem_ops.mog_free_rx_buffers = macb_free_rx_buffers; + bp->macbgem_ops.mog_init_rings = macb_init_rings; + bp->macbgem_ops.mog_rx = macb_rx; + dev->ethtool_ops = &macb_ethtool_ops; + } + + /* Set features */ + dev->hw_features = NETIF_F_SG; + + /* Check LSO capability */ + if (GEM_BFEXT(PBUF_LSO, gem_readl(bp, DCFG6))) + dev->hw_features |= MACB_NETIF_LSO; + + /* Checksum offload is only available on gem with packet buffer */ + if (macb_is_gem(bp) && !(bp->caps & MACB_CAPS_FIFO_MODE)) + dev->hw_features |= NETIF_F_HW_CSUM | NETIF_F_RXCSUM; + if (bp->caps & MACB_CAPS_SG_DISABLED) + dev->hw_features &= ~NETIF_F_SG; + dev->features = dev->hw_features; + + if (!(bp->caps & MACB_CAPS_USRIO_DISABLED)) { + val = 0; + if (bp->phy_interface == PHY_INTERFACE_MODE_RGMII) + val = GEM_BIT(RGMII); + else if (bp->phy_interface == PHY_INTERFACE_MODE_RMII && + (bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII)) + val = MACB_BIT(RMII); + else if (!(bp->caps & MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII)) + val = MACB_BIT(MII); + + if (bp->caps & MACB_CAPS_USRIO_HAS_CLKEN) + val |= MACB_BIT(CLKEN); + + macb_or_gem_writel(bp, USRIO, val); + } + + /* Set MII management clock divider */ + val = macb_mdc_clk_div(bp); + val |= macb_dbw(bp); + if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) + val |= GEM_BIT(SGMIIEN) | GEM_BIT(PCSSEL); + macb_writel(bp, NCFGR, val); + + return 0; +} + +#if defined(CONFIG_OF) +/* 1518 rounded up */ +#define AT91ETHER_MAX_RBUFF_SZ 0x600 +/* max number of receive buffers */ +#define AT91ETHER_MAX_RX_DESCR 9 + +/* Initialize and start the Receiver and Transmit subsystems */ +static int at91ether_start(struct net_device *dev) +{ + struct macb *lp = netdev_priv(dev); + struct macb_dma_desc *desc; + dma_addr_t addr; + u32 ctl; + int i; + + lp->rx_ring = dma_alloc_coherent(&lp->pdev->dev, + (AT91ETHER_MAX_RX_DESCR * + macb_dma_desc_get_size(lp)), + &lp->rx_ring_dma, GFP_KERNEL); + if (!lp->rx_ring) + return -ENOMEM; + + lp->rx_buffers = dma_alloc_coherent(&lp->pdev->dev, + AT91ETHER_MAX_RX_DESCR * + AT91ETHER_MAX_RBUFF_SZ, + &lp->rx_buffers_dma, GFP_KERNEL); + if (!lp->rx_buffers) { + dma_free_coherent(&lp->pdev->dev, + AT91ETHER_MAX_RX_DESCR * + macb_dma_desc_get_size(lp), + lp->rx_ring, lp->rx_ring_dma); + lp->rx_ring = NULL; + return -ENOMEM; + } + + addr = lp->rx_buffers_dma; + for (i = 0; i < AT91ETHER_MAX_RX_DESCR; i++) { + desc = macb_rx_desc(lp, i); + macb_set_addr(lp, desc, addr); + desc->ctrl = 0; + addr += AT91ETHER_MAX_RBUFF_SZ; + } + + /* Set the Wrap bit on the last descriptor */ + desc->addr |= MACB_BIT(RX_WRAP); + + /* Reset buffer index */ + lp->rx_tail = 0; + + /* Program address of descriptor list in Rx Buffer Queue register */ + macb_writel(lp, RBQP, lp->rx_ring_dma); + + /* Enable Receive and Transmit */ + ctl = macb_readl(lp, NCR); + macb_writel(lp, NCR, ctl | MACB_BIT(RE) | MACB_BIT(TE)); + + return 0; +} + +/* Open the ethernet interface */ +static int at91ether_open(struct net_device *dev) +{ + struct macb *lp = netdev_priv(dev); + u32 ctl; + int ret; + + /* Clear internal statistics */ + ctl = macb_readl(lp, NCR); + macb_writel(lp, NCR, ctl | MACB_BIT(CLRSTAT)); + + macb_set_hwaddr(lp); + + ret = at91ether_start(dev); + if (ret) + return ret; + + /* Enable MAC interrupts */ + macb_writel(lp, IER, MACB_BIT(RCOMP) | + MACB_BIT(RXUBR) | + MACB_BIT(ISR_TUND) | + MACB_BIT(ISR_RLE) | + MACB_BIT(TCOMP) | + MACB_BIT(ISR_ROVR) | + MACB_BIT(HRESP)); + + /* schedule a link state check */ + phy_start(dev->phydev); + + netif_start_queue(dev); + + return 0; +} + +/* Close the interface */ +static int at91ether_close(struct net_device *dev) +{ + struct macb *lp = netdev_priv(dev); + u32 ctl; + + /* Disable Receiver and Transmitter */ + ctl = macb_readl(lp, NCR); + macb_writel(lp, NCR, ctl & ~(MACB_BIT(TE) | MACB_BIT(RE))); + + /* Disable MAC interrupts */ + macb_writel(lp, IDR, MACB_BIT(RCOMP) | + MACB_BIT(RXUBR) | + MACB_BIT(ISR_TUND) | + MACB_BIT(ISR_RLE) | + MACB_BIT(TCOMP) | + MACB_BIT(ISR_ROVR) | + MACB_BIT(HRESP)); + + netif_stop_queue(dev); + + dma_free_coherent(&lp->pdev->dev, + AT91ETHER_MAX_RX_DESCR * + macb_dma_desc_get_size(lp), + lp->rx_ring, lp->rx_ring_dma); + lp->rx_ring = NULL; + + dma_free_coherent(&lp->pdev->dev, + AT91ETHER_MAX_RX_DESCR * AT91ETHER_MAX_RBUFF_SZ, + lp->rx_buffers, lp->rx_buffers_dma); + lp->rx_buffers = NULL; + + return 0; +} + +/* Transmit packet */ +static int at91ether_start_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct macb *lp = netdev_priv(dev); + + if (macb_readl(lp, TSR) & MACB_BIT(RM9200_BNQ)) { + netif_stop_queue(dev); + + /* Store packet information (to free when Tx completed) */ + lp->skb = skb; + lp->skb_length = skb->len; + lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len, + DMA_TO_DEVICE); + if (dma_mapping_error(NULL, lp->skb_physaddr)) { + dev_kfree_skb_any(skb); + dev->stats.tx_dropped++; + netdev_err(dev, "%s: DMA mapping error\n", __func__); + return NETDEV_TX_OK; + } + + /* Set address of the data in the Transmit Address register */ + macb_writel(lp, TAR, lp->skb_physaddr); + /* Set length of the packet in the Transmit Control register */ + macb_writel(lp, TCR, skb->len); + + } else { + netdev_err(dev, "%s called, but device is busy!\n", __func__); + return NETDEV_TX_BUSY; + } + + return NETDEV_TX_OK; +} + +/* Extract received frame from buffer descriptors and sent to upper layers. + * (Called from interrupt context) + */ +static void at91ether_rx(struct net_device *dev) +{ + struct macb *lp = netdev_priv(dev); + struct macb_dma_desc *desc; + unsigned char *p_recv; + struct sk_buff *skb; + unsigned int pktlen; + + desc = macb_rx_desc(lp, lp->rx_tail); + while (desc->addr & MACB_BIT(RX_USED)) { + p_recv = lp->rx_buffers + lp->rx_tail * AT91ETHER_MAX_RBUFF_SZ; + pktlen = MACB_BF(RX_FRMLEN, desc->ctrl); + skb = netdev_alloc_skb(dev, pktlen + 2); + if (skb) { + skb_reserve(skb, 2); + skb_put_data(skb, p_recv, pktlen); + + skb->protocol = eth_type_trans(skb, dev); + dev->stats.rx_packets++; + dev->stats.rx_bytes += pktlen; + netif_rx(skb); + } else { + dev->stats.rx_dropped++; + } + + if (desc->ctrl & MACB_BIT(RX_MHASH_MATCH)) + dev->stats.multicast++; + + /* reset ownership bit */ + desc->addr &= ~MACB_BIT(RX_USED); + + /* wrap after last buffer */ + if (lp->rx_tail == AT91ETHER_MAX_RX_DESCR - 1) + lp->rx_tail = 0; + else + lp->rx_tail++; + + desc = macb_rx_desc(lp, lp->rx_tail); + } +} + +/* MAC interrupt handler */ +static irqreturn_t at91ether_interrupt(int irq, void *dev_id) +{ + struct net_device *dev = dev_id; + struct macb *lp = netdev_priv(dev); + u32 intstatus, ctl; + + /* MAC Interrupt Status register indicates what interrupts are pending. + * It is automatically cleared once read. + */ + intstatus = macb_readl(lp, ISR); + + /* Receive complete */ + if (intstatus & MACB_BIT(RCOMP)) + at91ether_rx(dev); + + /* Transmit complete */ + if (intstatus & MACB_BIT(TCOMP)) { + /* The TCOM bit is set even if the transmission failed */ + if (intstatus & (MACB_BIT(ISR_TUND) | MACB_BIT(ISR_RLE))) + dev->stats.tx_errors++; + + if (lp->skb) { + dev_kfree_skb_irq(lp->skb); + lp->skb = NULL; + dma_unmap_single(NULL, lp->skb_physaddr, + lp->skb_length, DMA_TO_DEVICE); + dev->stats.tx_packets++; + dev->stats.tx_bytes += lp->skb_length; + } + netif_wake_queue(dev); + } + + /* Work-around for EMAC Errata section 41.3.1 */ + if (intstatus & MACB_BIT(RXUBR)) { + ctl = macb_readl(lp, NCR); + macb_writel(lp, NCR, ctl & ~MACB_BIT(RE)); + wmb(); + macb_writel(lp, NCR, ctl | MACB_BIT(RE)); + } + + if (intstatus & MACB_BIT(ISR_ROVR)) + netdev_err(dev, "ROVR error\n"); + + return IRQ_HANDLED; +} + +#ifdef CONFIG_NET_POLL_CONTROLLER +static void at91ether_poll_controller(struct net_device *dev) +{ + unsigned long flags; + + local_irq_save(flags); + at91ether_interrupt(dev->irq, dev); + local_irq_restore(flags); +} +#endif + +static const struct net_device_ops at91ether_netdev_ops = { + .ndo_open = at91ether_open, + .ndo_stop = at91ether_close, + .ndo_start_xmit = at91ether_start_xmit, + .ndo_get_stats = macb_get_stats, + .ndo_set_rx_mode = macb_set_rx_mode, + .ndo_set_mac_address = eth_mac_addr, + .ndo_do_ioctl = macb_ioctl, + .ndo_validate_addr = eth_validate_addr, +#ifdef CONFIG_NET_POLL_CONTROLLER + .ndo_poll_controller = at91ether_poll_controller, +#endif +}; + +static int at91ether_clk_init(struct platform_device *pdev, struct clk **pclk, + struct clk **hclk, struct clk **tx_clk, + struct clk **rx_clk) +{ + int err; + + *hclk = NULL; + *tx_clk = NULL; + *rx_clk = NULL; + + *pclk = devm_clk_get(&pdev->dev, "ether_clk"); + if (IS_ERR(*pclk)) + return PTR_ERR(*pclk); + + err = clk_prepare_enable(*pclk); + if (err) { + dev_err(&pdev->dev, "failed to enable pclk (%u)\n", err); + return err; + } + + return 0; +} + +static int at91ether_init(struct platform_device *pdev) +{ + struct net_device *dev = platform_get_drvdata(pdev); + struct macb *bp = netdev_priv(dev); + int err; + u32 reg; + + dev->netdev_ops = &at91ether_netdev_ops; + dev->ethtool_ops = &macb_ethtool_ops; + + err = devm_request_irq(&pdev->dev, dev->irq, at91ether_interrupt, + 0, dev->name, dev); + if (err) + return err; + + macb_writel(bp, NCR, 0); + + reg = MACB_BF(CLK, MACB_CLK_DIV32) | MACB_BIT(BIG); + if (bp->phy_interface == PHY_INTERFACE_MODE_RMII) + reg |= MACB_BIT(RM9200_RMII); + + macb_writel(bp, NCFGR, reg); + + return 0; +} + +static const struct macb_config at91sam9260_config = { + .caps = MACB_CAPS_USRIO_HAS_CLKEN | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, + .clk_init = macb_clk_init, + .init = macb_init, +}; + +static const struct macb_config pc302gem_config = { + .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE, + .dma_burst_length = 16, + .clk_init = macb_clk_init, + .init = macb_init, +}; + +static const struct macb_config sama5d2_config = { + .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, + .dma_burst_length = 16, + .clk_init = macb_clk_init, + .init = macb_init, +}; + +static const struct macb_config sama5d3_config = { + .caps = MACB_CAPS_SG_DISABLED | MACB_CAPS_GIGABIT_MODE_AVAILABLE + | MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, + .dma_burst_length = 16, + .clk_init = macb_clk_init, + .init = macb_init, +}; + +static const struct macb_config sama5d4_config = { + .caps = MACB_CAPS_USRIO_DEFAULT_IS_MII_GMII, + .dma_burst_length = 4, + .clk_init = macb_clk_init, + .init = macb_init, +}; + +static const struct macb_config emac_config = { + .clk_init = at91ether_clk_init, + .init = at91ether_init, +}; + +static const struct macb_config np4_config = { + .caps = MACB_CAPS_USRIO_DISABLED, + .clk_init = macb_clk_init, + .init = macb_init, +}; + +static const struct macb_config zynqmp_config = { + .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO, + .dma_burst_length = 16, + .clk_init = macb_clk_init, + .init = macb_init, + .jumbo_max_len = 10240, +}; + +static const struct macb_config zynq_config = { + .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_NO_GIGABIT_HALF, + .dma_burst_length = 16, + .clk_init = macb_clk_init, + .init = macb_init, +}; + +static const struct of_device_id macb_dt_ids[] = { + { .compatible = "cdns,at32ap7000-macb" }, + { .compatible = "cdns,at91sam9260-macb", .data = &at91sam9260_config }, + { .compatible = "cdns,macb" }, + { .compatible = "cdns,np4-macb", .data = &np4_config }, + { .compatible = "cdns,pc302-gem", .data = &pc302gem_config }, + { .compatible = "cdns,gem", .data = &pc302gem_config }, + { .compatible = "atmel,sama5d2-gem", .data = &sama5d2_config }, + { .compatible = "atmel,sama5d3-gem", .data = &sama5d3_config }, + { .compatible = "atmel,sama5d4-gem", .data = &sama5d4_config }, + { .compatible = "cdns,at91rm9200-emac", .data = &emac_config }, + { .compatible = "cdns,emac", .data = &emac_config }, + { .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config}, + { .compatible = "cdns,zynq-gem", .data = &zynq_config }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, macb_dt_ids); +#endif /* CONFIG_OF */ + +static const struct macb_config default_gem_config = { + .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO, + .dma_burst_length = 16, + .clk_init = macb_clk_init, + .init = macb_init, + .jumbo_max_len = 10240, +}; + +static int macb_probe(struct platform_device *pdev) +{ + const struct macb_config *macb_config = &default_gem_config; + int (*clk_init)(struct platform_device *, struct clk **, + struct clk **, struct clk **, struct clk **) + = macb_config->clk_init; + int (*init)(struct platform_device *) = macb_config->init; + struct device_node *np = pdev->dev.of_node; + struct device_node *phy_node; + struct clk *pclk, *hclk = NULL, *tx_clk = NULL, *rx_clk = NULL; + unsigned int queue_mask, num_queues; + struct macb_platform_data *pdata; + bool native_io; + struct phy_device *phydev; + struct net_device *dev; + struct resource *regs; + void __iomem *mem; + const char *mac; + struct macb *bp; + int err; + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mem = devm_ioremap_resource(&pdev->dev, regs); + if (IS_ERR(mem)) + return PTR_ERR(mem); + + if (np) { + const struct of_device_id *match; + + match = of_match_node(macb_dt_ids, np); + if (match && match->data) { + macb_config = match->data; + clk_init = macb_config->clk_init; + init = macb_config->init; + } + } + + err = clk_init(pdev, &pclk, &hclk, &tx_clk, &rx_clk); + if (err) + return err; + + native_io = hw_is_native_io(mem); + + macb_probe_queues(mem, native_io, &queue_mask, &num_queues); + dev = alloc_etherdev_mq(sizeof(*bp), num_queues); + if (!dev) { + err = -ENOMEM; + goto err_disable_clocks; + } + + dev->base_addr = regs->start; + + SET_NETDEV_DEV(dev, &pdev->dev); + + bp = netdev_priv(dev); + bp->pdev = pdev; + bp->dev = dev; + bp->regs = mem; + bp->native_io = native_io; + if (native_io) { + bp->macb_reg_readl = hw_readl_native; + bp->macb_reg_writel = hw_writel_native; + } else { + bp->macb_reg_readl = hw_readl; + bp->macb_reg_writel = hw_writel; + } + bp->num_queues = num_queues; + bp->queue_mask = queue_mask; + if (macb_config) + bp->dma_burst_length = macb_config->dma_burst_length; + bp->pclk = pclk; + bp->hclk = hclk; + bp->tx_clk = tx_clk; + bp->rx_clk = rx_clk; + if (macb_config) + bp->jumbo_max_len = macb_config->jumbo_max_len; + + bp->wol = 0; + if (of_get_property(np, "magic-packet", NULL)) + bp->wol |= MACB_WOL_HAS_MAGIC_PACKET; + device_init_wakeup(&pdev->dev, bp->wol & MACB_WOL_HAS_MAGIC_PACKET); + + spin_lock_init(&bp->lock); + + /* setup capabilities */ + macb_configure_caps(bp, macb_config); + +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + if (GEM_BFEXT(DAW64, gem_readl(bp, DCFG6))) { + dma_set_mask(&pdev->dev, DMA_BIT_MASK(44)); + bp->hw_dma_cap |= HW_DMA_CAP_64B; + } +#endif + platform_set_drvdata(pdev, dev); + + dev->irq = platform_get_irq(pdev, 0); + if (dev->irq < 0) { + err = dev->irq; + goto err_out_free_netdev; + } + + /* MTU range: 68 - 1500 or 10240 */ + dev->min_mtu = GEM_MTU_MIN_SIZE; + if (bp->caps & MACB_CAPS_JUMBO) + dev->max_mtu = gem_readl(bp, JML) - ETH_HLEN - ETH_FCS_LEN; + else + dev->max_mtu = ETH_DATA_LEN; + + mac = of_get_mac_address(np); + if (mac) + ether_addr_copy(bp->dev->dev_addr, mac); + else + macb_get_hwaddr(bp); + + /* Power up the PHY if there is a GPIO reset */ + phy_node = of_get_next_available_child(np, NULL); + if (phy_node) { + int gpio = of_get_named_gpio(phy_node, "reset-gpios", 0); + + if (gpio_is_valid(gpio)) { + bp->reset_gpio = gpio_to_desc(gpio); + gpiod_direction_output(bp->reset_gpio, 1); + } + } + of_node_put(phy_node); + + err = of_get_phy_mode(np); + if (err < 0) { + pdata = dev_get_platdata(&pdev->dev); + if (pdata && pdata->is_rmii) + bp->phy_interface = PHY_INTERFACE_MODE_RMII; + else + bp->phy_interface = PHY_INTERFACE_MODE_MII; + } else { + bp->phy_interface = err; + } + + /* IP specific init */ + err = init(pdev); + if (err) + goto err_out_free_netdev; + + err = macb_mii_init(bp); + if (err) + goto err_out_free_netdev; + + phydev = dev->phydev; + + netif_carrier_off(dev); + + err = register_netdev(dev); + if (err) { + dev_err(&pdev->dev, "Cannot register net device, aborting.\n"); + goto err_out_unregister_mdio; + } + + phy_attached_info(phydev); + + netdev_info(dev, "Cadence %s rev 0x%08x at 0x%08lx irq %d (%pM)\n", + macb_is_gem(bp) ? "GEM" : "MACB", macb_readl(bp, MID), + dev->base_addr, dev->irq, dev->dev_addr); + + return 0; + +err_out_unregister_mdio: + phy_disconnect(dev->phydev); + mdiobus_unregister(bp->mii_bus); + mdiobus_free(bp->mii_bus); + + /* Shutdown the PHY if there is a GPIO reset */ + if (bp->reset_gpio) + gpiod_set_value(bp->reset_gpio, 0); + +err_out_free_netdev: + free_netdev(dev); + +err_disable_clocks: + clk_disable_unprepare(tx_clk); + clk_disable_unprepare(hclk); + clk_disable_unprepare(pclk); + clk_disable_unprepare(rx_clk); + + return err; +} + +static int macb_remove(struct platform_device *pdev) +{ + struct net_device *dev; + struct macb *bp; + + dev = platform_get_drvdata(pdev); + + if (dev) { + bp = netdev_priv(dev); + if (dev->phydev) + phy_disconnect(dev->phydev); + mdiobus_unregister(bp->mii_bus); + dev->phydev = NULL; + mdiobus_free(bp->mii_bus); + + /* Shutdown the PHY if there is a GPIO reset */ + if (bp->reset_gpio) + gpiod_set_value(bp->reset_gpio, 0); + + unregister_netdev(dev); + clk_disable_unprepare(bp->tx_clk); + clk_disable_unprepare(bp->hclk); + clk_disable_unprepare(bp->pclk); + clk_disable_unprepare(bp->rx_clk); + of_node_put(bp->phy_node); + free_netdev(dev); + } + + return 0; +} + +static int __maybe_unused macb_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct net_device *netdev = platform_get_drvdata(pdev); + struct macb *bp = netdev_priv(netdev); + + netif_carrier_off(netdev); + netif_device_detach(netdev); + + if (bp->wol & MACB_WOL_ENABLED) { + macb_writel(bp, IER, MACB_BIT(WOL)); + macb_writel(bp, WOL, MACB_BIT(MAG)); + enable_irq_wake(bp->queues[0].irq); + } else { + clk_disable_unprepare(bp->tx_clk); + clk_disable_unprepare(bp->hclk); + clk_disable_unprepare(bp->pclk); + clk_disable_unprepare(bp->rx_clk); + } + + return 0; +} + +static int __maybe_unused macb_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct net_device *netdev = platform_get_drvdata(pdev); + struct macb *bp = netdev_priv(netdev); + + if (bp->wol & MACB_WOL_ENABLED) { + macb_writel(bp, IDR, MACB_BIT(WOL)); + macb_writel(bp, WOL, 0); + disable_irq_wake(bp->queues[0].irq); + } else { + clk_prepare_enable(bp->pclk); + clk_prepare_enable(bp->hclk); + clk_prepare_enable(bp->tx_clk); + clk_prepare_enable(bp->rx_clk); + } + + netif_device_attach(netdev); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(macb_pm_ops, macb_suspend, macb_resume); + +static struct platform_driver macb_driver = { + .probe = macb_probe, + .remove = macb_remove, + .driver = { + .name = "macb", + .of_match_table = of_match_ptr(macb_dt_ids), + .pm = &macb_pm_ops, + }, +}; + +module_platform_driver(macb_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Cadence MACB/GEM Ethernet driver"); +MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); +MODULE_ALIAS("platform:macb");