--- /dev/null
+/*
+ * linux/drivers/net/ethoc.c
+ *
+ * Copyright (C) 2007-2008 Avionic Design Development GmbH
+ * Copyright (C) 2008-2009 Avionic Design GmbH
+ *
+ * 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.
+ *
+ * Written by Thierry Reding <thierry.reding@avionic-design.de>
+ */
+
+#include <linux/etherdevice.h>
+#include <linux/crc32.h>
+#include <linux/io.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <net/ethoc.h>
+
+/* register offsets */
+#define MODER 0x00
+#define INT_SOURCE 0x04
+#define INT_MASK 0x08
+#define IPGT 0x0c
+#define IPGR1 0x10
+#define IPGR2 0x14
+#define PACKETLEN 0x18
+#define COLLCONF 0x1c
+#define TX_BD_NUM 0x20
+#define CTRLMODER 0x24
+#define MIIMODER 0x28
+#define MIICOMMAND 0x2c
+#define MIIADDRESS 0x30
+#define MIITX_DATA 0x34
+#define MIIRX_DATA 0x38
+#define MIISTATUS 0x3c
+#define MAC_ADDR0 0x40
+#define MAC_ADDR1 0x44
+#define ETH_HASH0 0x48
+#define ETH_HASH1 0x4c
+#define ETH_TXCTRL 0x50
+
+/* mode register */
+#define MODER_RXEN (1 << 0) /* receive enable */
+#define MODER_TXEN (1 << 1) /* transmit enable */
+#define MODER_NOPRE (1 << 2) /* no preamble */
+#define MODER_BRO (1 << 3) /* broadcast address */
+#define MODER_IAM (1 << 4) /* individual address mode */
+#define MODER_PRO (1 << 5) /* promiscuous mode */
+#define MODER_IFG (1 << 6) /* interframe gap for incoming frames */
+#define MODER_LOOP (1 << 7) /* loopback */
+#define MODER_NBO (1 << 8) /* no back-off */
+#define MODER_EDE (1 << 9) /* excess defer enable */
+#define MODER_FULLD (1 << 10) /* full duplex */
+#define MODER_RESET (1 << 11) /* FIXME: reset (undocumented) */
+#define MODER_DCRC (1 << 12) /* delayed CRC enable */
+#define MODER_CRC (1 << 13) /* CRC enable */
+#define MODER_HUGE (1 << 14) /* huge packets enable */
+#define MODER_PAD (1 << 15) /* padding enabled */
+#define MODER_RSM (1 << 16) /* receive small packets */
+
+/* interrupt source and mask registers */
+#define INT_MASK_TXF (1 << 0) /* transmit frame */
+#define INT_MASK_TXE (1 << 1) /* transmit error */
+#define INT_MASK_RXF (1 << 2) /* receive frame */
+#define INT_MASK_RXE (1 << 3) /* receive error */
+#define INT_MASK_BUSY (1 << 4)
+#define INT_MASK_TXC (1 << 5) /* transmit control frame */
+#define INT_MASK_RXC (1 << 6) /* receive control frame */
+
+#define INT_MASK_TX (INT_MASK_TXF | INT_MASK_TXE)
+#define INT_MASK_RX (INT_MASK_RXF | INT_MASK_RXE)
+
+#define INT_MASK_ALL ( \
+ INT_MASK_TXF | INT_MASK_TXE | \
+ INT_MASK_RXF | INT_MASK_RXE | \
+ INT_MASK_TXC | INT_MASK_RXC | \
+ INT_MASK_BUSY \
+ )
+
+/* packet length register */
+#define PACKETLEN_MIN(min) (((min) & 0xffff) << 16)
+#define PACKETLEN_MAX(max) (((max) & 0xffff) << 0)
+#define PACKETLEN_MIN_MAX(min, max) (PACKETLEN_MIN(min) | \
+ PACKETLEN_MAX(max))
+
+/* transmit buffer number register */
+#define TX_BD_NUM_VAL(x) (((x) <= 0x80) ? (x) : 0x80)
+
+/* control module mode register */
+#define CTRLMODER_PASSALL (1 << 0) /* pass all receive frames */
+#define CTRLMODER_RXFLOW (1 << 1) /* receive control flow */
+#define CTRLMODER_TXFLOW (1 << 2) /* transmit control flow */
+
+/* MII mode register */
+#define MIIMODER_CLKDIV(x) ((x) & 0xfe) /* needs to be an even number */
+#define MIIMODER_NOPRE (1 << 8) /* no preamble */
+
+/* MII command register */
+#define MIICOMMAND_SCAN (1 << 0) /* scan status */
+#define MIICOMMAND_READ (1 << 1) /* read status */
+#define MIICOMMAND_WRITE (1 << 2) /* write control data */
+
+/* MII address register */
+#define MIIADDRESS_FIAD(x) (((x) & 0x1f) << 0)
+#define MIIADDRESS_RGAD(x) (((x) & 0x1f) << 8)
+#define MIIADDRESS_ADDR(phy, reg) (MIIADDRESS_FIAD(phy) | \
+ MIIADDRESS_RGAD(reg))
+
+/* MII transmit data register */
+#define MIITX_DATA_VAL(x) ((x) & 0xffff)
+
+/* MII receive data register */
+#define MIIRX_DATA_VAL(x) ((x) & 0xffff)
+
+/* MII status register */
+#define MIISTATUS_LINKFAIL (1 << 0)
+#define MIISTATUS_BUSY (1 << 1)
+#define MIISTATUS_INVALID (1 << 2)
+
+/* TX buffer descriptor */
+#define TX_BD_CS (1 << 0) /* carrier sense lost */
+#define TX_BD_DF (1 << 1) /* defer indication */
+#define TX_BD_LC (1 << 2) /* late collision */
+#define TX_BD_RL (1 << 3) /* retransmission limit */
+#define TX_BD_RETRY_MASK (0x00f0)
+#define TX_BD_RETRY(x) (((x) & 0x00f0) >> 4)
+#define TX_BD_UR (1 << 8) /* transmitter underrun */
+#define TX_BD_CRC (1 << 11) /* TX CRC enable */
+#define TX_BD_PAD (1 << 12) /* pad enable for short packets */
+#define TX_BD_WRAP (1 << 13)
+#define TX_BD_IRQ (1 << 14) /* interrupt request enable */
+#define TX_BD_READY (1 << 15) /* TX buffer ready */
+#define TX_BD_LEN(x) (((x) & 0xffff) << 16)
+#define TX_BD_LEN_MASK (0xffff << 16)
+
+#define TX_BD_STATS (TX_BD_CS | TX_BD_DF | TX_BD_LC | \
+ TX_BD_RL | TX_BD_RETRY_MASK | TX_BD_UR)
+
+/* RX buffer descriptor */
+#define RX_BD_LC (1 << 0) /* late collision */
+#define RX_BD_CRC (1 << 1) /* RX CRC error */
+#define RX_BD_SF (1 << 2) /* short frame */
+#define RX_BD_TL (1 << 3) /* too long */
+#define RX_BD_DN (1 << 4) /* dribble nibble */
+#define RX_BD_IS (1 << 5) /* invalid symbol */
+#define RX_BD_OR (1 << 6) /* receiver overrun */
+#define RX_BD_MISS (1 << 7)
+#define RX_BD_CF (1 << 8) /* control frame */
+#define RX_BD_WRAP (1 << 13)
+#define RX_BD_IRQ (1 << 14) /* interrupt request enable */
+#define RX_BD_EMPTY (1 << 15)
+#define RX_BD_LEN(x) (((x) & 0xffff) << 16)
+
+#define RX_BD_STATS (RX_BD_LC | RX_BD_CRC | RX_BD_SF | RX_BD_TL | \
+ RX_BD_DN | RX_BD_IS | RX_BD_OR | RX_BD_MISS)
+
+#define ETHOC_BUFSIZ 1536
+#define ETHOC_ZLEN 64
+#define ETHOC_BD_BASE 0x400
+#define ETHOC_TIMEOUT (HZ / 2)
+#define ETHOC_MII_TIMEOUT (1 + (HZ / 5))
+
+/**
+ * struct ethoc - driver-private device structure
+ * @iobase: pointer to I/O memory region
+ * @membase: pointer to buffer memory region
+ * @num_tx: number of send buffers
+ * @cur_tx: last send buffer written
+ * @dty_tx: last buffer actually sent
+ * @num_rx: number of receive buffers
+ * @cur_rx: current receive buffer
+ * @netdev: pointer to network device structure
+ * @napi: NAPI structure
+ * @stats: network device statistics
+ * @msg_enable: device state flags
+ * @rx_lock: receive lock
+ * @lock: device lock
+ * @phy: attached PHY
+ * @mdio: MDIO bus for PHY access
+ * @phy_id: address of attached PHY
+ */
+struct ethoc {
+ void __iomem *iobase;
+ void __iomem *membase;
+
+ unsigned int num_tx;
+ unsigned int cur_tx;
+ unsigned int dty_tx;
+
+ unsigned int num_rx;
+ unsigned int cur_rx;
+
+ struct net_device *netdev;
+ struct napi_struct napi;
+ struct net_device_stats stats;
+ u32 msg_enable;
+
+ spinlock_t rx_lock;
+ spinlock_t lock;
+
+ struct phy_device *phy;
+ struct mii_bus *mdio;
+ s8 phy_id;
+};
+
+/**
+ * struct ethoc_bd - buffer descriptor
+ * @stat: buffer statistics
+ * @addr: physical memory address
+ */
+struct ethoc_bd {
+ u32 stat;
+ u32 addr;
+};
+
+static u32 ethoc_read(struct ethoc *dev, loff_t offset)
+{
+ return ioread32(dev->iobase + offset);
+}
+
+static void ethoc_write(struct ethoc *dev, loff_t offset, u32 data)
+{
+ iowrite32(data, dev->iobase + offset);
+}
+
+static void ethoc_read_bd(struct ethoc *dev, int index, struct ethoc_bd *bd)
+{
+ loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
+ bd->stat = ethoc_read(dev, offset + 0);
+ bd->addr = ethoc_read(dev, offset + 4);
+}
+
+static void ethoc_write_bd(struct ethoc *dev, int index,
+ const struct ethoc_bd *bd)
+{
+ loff_t offset = ETHOC_BD_BASE + (index * sizeof(struct ethoc_bd));
+ ethoc_write(dev, offset + 0, bd->stat);
+ ethoc_write(dev, offset + 4, bd->addr);
+}
+
+static void ethoc_enable_irq(struct ethoc *dev, u32 mask)
+{
+ u32 imask = ethoc_read(dev, INT_MASK);
+ imask |= mask;
+ ethoc_write(dev, INT_MASK, imask);
+}
+
+static void ethoc_disable_irq(struct ethoc *dev, u32 mask)
+{
+ u32 imask = ethoc_read(dev, INT_MASK);
+ imask &= ~mask;
+ ethoc_write(dev, INT_MASK, imask);
+}
+
+static void ethoc_ack_irq(struct ethoc *dev, u32 mask)
+{
+ ethoc_write(dev, INT_SOURCE, mask);
+}
+
+static void ethoc_enable_rx_and_tx(struct ethoc *dev)
+{
+ u32 mode = ethoc_read(dev, MODER);
+ mode |= MODER_RXEN | MODER_TXEN;
+ ethoc_write(dev, MODER, mode);
+}
+
+static void ethoc_disable_rx_and_tx(struct ethoc *dev)
+{
+ u32 mode = ethoc_read(dev, MODER);
+ mode &= ~(MODER_RXEN | MODER_TXEN);
+ ethoc_write(dev, MODER, mode);
+}
+
+static int ethoc_init_ring(struct ethoc *dev)
+{
+ struct ethoc_bd bd;
+ int i;
+
+ dev->cur_tx = 0;
+ dev->dty_tx = 0;
+ dev->cur_rx = 0;
+
+ /* setup transmission buffers */
+ bd.addr = 0;
+ bd.stat = TX_BD_IRQ | TX_BD_CRC;
+
+ for (i = 0; i < dev->num_tx; i++) {
+ if (i == dev->num_tx - 1)
+ bd.stat |= TX_BD_WRAP;
+
+ ethoc_write_bd(dev, i, &bd);
+ bd.addr += ETHOC_BUFSIZ;
+ }
+
+ bd.addr = dev->num_tx * ETHOC_BUFSIZ;
+ bd.stat = RX_BD_EMPTY | RX_BD_IRQ;
+
+ for (i = 0; i < dev->num_rx; i++) {
+ if (i == dev->num_rx - 1)
+ bd.stat |= RX_BD_WRAP;
+
+ ethoc_write_bd(dev, dev->num_tx + i, &bd);
+ bd.addr += ETHOC_BUFSIZ;
+ }
+
+ return 0;
+}
+
+static int ethoc_reset(struct ethoc *dev)
+{
+ u32 mode;
+
+ /* TODO: reset controller? */
+
+ ethoc_disable_rx_and_tx(dev);
+
+ /* TODO: setup registers */
+
+ /* enable FCS generation and automatic padding */
+ mode = ethoc_read(dev, MODER);
+ mode |= MODER_CRC | MODER_PAD;
+ ethoc_write(dev, MODER, mode);
+
+ /* set full-duplex mode */
+ mode = ethoc_read(dev, MODER);
+ mode |= MODER_FULLD;
+ ethoc_write(dev, MODER, mode);
+ ethoc_write(dev, IPGT, 0x15);
+
+ ethoc_ack_irq(dev, INT_MASK_ALL);
+ ethoc_enable_irq(dev, INT_MASK_ALL);
+ ethoc_enable_rx_and_tx(dev);
+ return 0;
+}
+
+static unsigned int ethoc_update_rx_stats(struct ethoc *dev,
+ struct ethoc_bd *bd)
+{
+ struct net_device *netdev = dev->netdev;
+ unsigned int ret = 0;
+
+ if (bd->stat & RX_BD_TL) {
+ dev_err(&netdev->dev, "RX: frame too long\n");
+ dev->stats.rx_length_errors++;
+ ret++;
+ }
+
+ if (bd->stat & RX_BD_SF) {
+ dev_err(&netdev->dev, "RX: frame too short\n");
+ dev->stats.rx_length_errors++;
+ ret++;
+ }
+
+ if (bd->stat & RX_BD_DN) {
+ dev_err(&netdev->dev, "RX: dribble nibble\n");
+ dev->stats.rx_frame_errors++;
+ }
+
+ if (bd->stat & RX_BD_CRC) {
+ dev_err(&netdev->dev, "RX: wrong CRC\n");
+ dev->stats.rx_crc_errors++;
+ ret++;
+ }
+
+ if (bd->stat & RX_BD_OR) {
+ dev_err(&netdev->dev, "RX: overrun\n");
+ dev->stats.rx_over_errors++;
+ ret++;
+ }
+
+ if (bd->stat & RX_BD_MISS)
+ dev->stats.rx_missed_errors++;
+
+ if (bd->stat & RX_BD_LC) {
+ dev_err(&netdev->dev, "RX: late collision\n");
+ dev->stats.collisions++;
+ ret++;
+ }
+
+ return ret;
+}
+
+static int ethoc_rx(struct net_device *dev, int limit)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ int count;
+
+ for (count = 0; count < limit; ++count) {
+ unsigned int entry;
+ struct ethoc_bd bd;
+
+ entry = priv->num_tx + (priv->cur_rx % priv->num_rx);
+ ethoc_read_bd(priv, entry, &bd);
+ if (bd.stat & RX_BD_EMPTY)
+ break;
+
+ if (ethoc_update_rx_stats(priv, &bd) == 0) {
+ int size = bd.stat >> 16;
+ struct sk_buff *skb = netdev_alloc_skb(dev, size);
+ if (likely(skb)) {
+ void *src = priv->membase + bd.addr;
+ memcpy_fromio(skb_put(skb, size), src, size);
+ skb->protocol = eth_type_trans(skb, dev);
+ dev->last_rx = jiffies;
+ priv->stats.rx_packets++;
+ priv->stats.rx_bytes += size;
+ netif_receive_skb(skb);
+ } else {
+ if (net_ratelimit())
+ dev_warn(&dev->dev, "low on memory - "
+ "packet dropped\n");
+
+ priv->stats.rx_dropped++;
+ break;
+ }
+ }
+
+ /* clear the buffer descriptor so it can be reused */
+ bd.stat &= ~RX_BD_STATS;
+ bd.stat |= RX_BD_EMPTY;
+ ethoc_write_bd(priv, entry, &bd);
+ priv->cur_rx++;
+ }
+
+ return count;
+}
+
+static int ethoc_update_tx_stats(struct ethoc *dev, struct ethoc_bd *bd)
+{
+ struct net_device *netdev = dev->netdev;
+
+ if (bd->stat & TX_BD_LC) {
+ dev_err(&netdev->dev, "TX: late collision\n");
+ dev->stats.tx_window_errors++;
+ }
+
+ if (bd->stat & TX_BD_RL) {
+ dev_err(&netdev->dev, "TX: retransmit limit\n");
+ dev->stats.tx_aborted_errors++;
+ }
+
+ if (bd->stat & TX_BD_UR) {
+ dev_err(&netdev->dev, "TX: underrun\n");
+ dev->stats.tx_fifo_errors++;
+ }
+
+ if (bd->stat & TX_BD_CS) {
+ dev_err(&netdev->dev, "TX: carrier sense lost\n");
+ dev->stats.tx_carrier_errors++;
+ }
+
+ if (bd->stat & TX_BD_STATS)
+ dev->stats.tx_errors++;
+
+ dev->stats.collisions += (bd->stat >> 4) & 0xf;
+ dev->stats.tx_bytes += bd->stat >> 16;
+ dev->stats.tx_packets++;
+ return 0;
+}
+
+static void ethoc_tx(struct net_device *dev)
+{
+ struct ethoc *priv = netdev_priv(dev);
+
+ spin_lock(&priv->lock);
+
+ while (priv->dty_tx != priv->cur_tx) {
+ unsigned int entry = priv->dty_tx % priv->num_tx;
+ struct ethoc_bd bd;
+
+ ethoc_read_bd(priv, entry, &bd);
+ if (bd.stat & TX_BD_READY)
+ break;
+
+ entry = (++priv->dty_tx) % priv->num_tx;
+ (void)ethoc_update_tx_stats(priv, &bd);
+ }
+
+ if ((priv->cur_tx - priv->dty_tx) <= (priv->num_tx / 2))
+ netif_wake_queue(dev);
+
+ ethoc_ack_irq(priv, INT_MASK_TX);
+ spin_unlock(&priv->lock);
+}
+
+static irqreturn_t ethoc_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = (struct net_device *)dev_id;
+ struct ethoc *priv = netdev_priv(dev);
+ u32 pending;
+
+ ethoc_disable_irq(priv, INT_MASK_ALL);
+ pending = ethoc_read(priv, INT_SOURCE);
+ if (unlikely(pending == 0)) {
+ ethoc_enable_irq(priv, INT_MASK_ALL);
+ return IRQ_NONE;
+ }
+
+ ethoc_ack_irq(priv, INT_MASK_ALL);
+
+ if (pending & INT_MASK_BUSY) {
+ dev_err(&dev->dev, "packet dropped\n");
+ priv->stats.rx_dropped++;
+ }
+
+ if (pending & INT_MASK_RX) {
+ if (napi_schedule_prep(&priv->napi))
+ __napi_schedule(&priv->napi);
+ } else {
+ ethoc_enable_irq(priv, INT_MASK_RX);
+ }
+
+ if (pending & INT_MASK_TX)
+ ethoc_tx(dev);
+
+ ethoc_enable_irq(priv, INT_MASK_ALL & ~INT_MASK_RX);
+ return IRQ_HANDLED;
+}
+
+static int ethoc_get_mac_address(struct net_device *dev, void *addr)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ u8 *mac = (u8 *)addr;
+ u32 reg;
+
+ reg = ethoc_read(priv, MAC_ADDR0);
+ mac[2] = (reg >> 24) & 0xff;
+ mac[3] = (reg >> 16) & 0xff;
+ mac[4] = (reg >> 8) & 0xff;
+ mac[5] = (reg >> 0) & 0xff;
+
+ reg = ethoc_read(priv, MAC_ADDR1);
+ mac[0] = (reg >> 8) & 0xff;
+ mac[1] = (reg >> 0) & 0xff;
+
+ return 0;
+}
+
+static int ethoc_poll(struct napi_struct *napi, int budget)
+{
+ struct ethoc *priv = container_of(napi, struct ethoc, napi);
+ int work_done = 0;
+
+ work_done = ethoc_rx(priv->netdev, budget);
+ if (work_done < budget) {
+ ethoc_enable_irq(priv, INT_MASK_RX);
+ napi_complete(napi);
+ }
+
+ return work_done;
+}
+
+static int ethoc_mdio_read(struct mii_bus *bus, int phy, int reg)
+{
+ unsigned long timeout = jiffies + ETHOC_MII_TIMEOUT;
+ struct ethoc *priv = bus->priv;
+
+ ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
+ ethoc_write(priv, MIICOMMAND, MIICOMMAND_READ);
+
+ while (time_before(jiffies, timeout)) {
+ u32 status = ethoc_read(priv, MIISTATUS);
+ if (!(status & MIISTATUS_BUSY)) {
+ u32 data = ethoc_read(priv, MIIRX_DATA);
+ /* reset MII command register */
+ ethoc_write(priv, MIICOMMAND, 0);
+ return data;
+ }
+
+ schedule();
+ }
+
+ return -EBUSY;
+}
+
+static int ethoc_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
+{
+ unsigned long timeout = jiffies + ETHOC_MII_TIMEOUT;
+ struct ethoc *priv = bus->priv;
+
+ ethoc_write(priv, MIIADDRESS, MIIADDRESS_ADDR(phy, reg));
+ ethoc_write(priv, MIITX_DATA, val);
+ ethoc_write(priv, MIICOMMAND, MIICOMMAND_WRITE);
+
+ while (time_before(jiffies, timeout)) {
+ u32 stat = ethoc_read(priv, MIISTATUS);
+ if (!(stat & MIISTATUS_BUSY))
+ return 0;
+
+ schedule();
+ }
+
+ return -EBUSY;
+}
+
+static int ethoc_mdio_reset(struct mii_bus *bus)
+{
+ return 0;
+}
+
+static void ethoc_mdio_poll(struct net_device *dev)
+{
+}
+
+static int ethoc_mdio_probe(struct net_device *dev)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ struct phy_device *phy;
+ int i;
+
+ for (i = 0; i < PHY_MAX_ADDR; i++) {
+ phy = priv->mdio->phy_map[i];
+ if (phy) {
+ if (priv->phy_id != -1) {
+ /* attach to specified PHY */
+ if (priv->phy_id == phy->addr)
+ break;
+ } else {
+ /* autoselect PHY if none was specified */
+ if (phy->addr != 0)
+ break;
+ }
+ }
+ }
+
+ if (!phy) {
+ dev_err(&dev->dev, "no PHY found\n");
+ return -ENXIO;
+ }
+
+ phy = phy_connect(dev, dev_name(&phy->dev), ðoc_mdio_poll, 0,
+ PHY_INTERFACE_MODE_GMII);
+ if (IS_ERR(phy)) {
+ dev_err(&dev->dev, "could not attach to PHY\n");
+ return PTR_ERR(phy);
+ }
+
+ priv->phy = phy;
+ return 0;
+}
+
+static int ethoc_open(struct net_device *dev)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ unsigned int min_tx = 2;
+ unsigned int num_bd;
+ int ret;
+
+ ret = request_irq(dev->irq, ethoc_interrupt, IRQF_SHARED,
+ dev->name, dev);
+ if (ret)
+ return ret;
+
+ /* calculate the number of TX/RX buffers */
+ num_bd = (dev->mem_end - dev->mem_start + 1) / ETHOC_BUFSIZ;
+ priv->num_tx = min(min_tx, num_bd / 4);
+ priv->num_rx = num_bd - priv->num_tx;
+ ethoc_write(priv, TX_BD_NUM, priv->num_tx);
+
+ ethoc_init_ring(priv);
+ ethoc_reset(priv);
+
+ if (netif_queue_stopped(dev)) {
+ dev_dbg(&dev->dev, " resuming queue\n");
+ netif_wake_queue(dev);
+ } else {
+ dev_dbg(&dev->dev, " starting queue\n");
+ netif_start_queue(dev);
+ }
+
+ phy_start(priv->phy);
+ napi_enable(&priv->napi);
+
+ if (netif_msg_ifup(priv)) {
+ dev_info(&dev->dev, "I/O: %08lx Memory: %08lx-%08lx\n",
+ dev->base_addr, dev->mem_start, dev->mem_end);
+ }
+
+ return 0;
+}
+
+static int ethoc_stop(struct net_device *dev)
+{
+ struct ethoc *priv = netdev_priv(dev);
+
+ napi_disable(&priv->napi);
+
+ if (priv->phy)
+ phy_stop(priv->phy);
+
+ ethoc_disable_rx_and_tx(priv);
+ free_irq(dev->irq, dev);
+
+ if (!netif_queue_stopped(dev))
+ netif_stop_queue(dev);
+
+ return 0;
+}
+
+static int ethoc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ struct mii_ioctl_data *mdio = if_mii(ifr);
+ struct phy_device *phy = NULL;
+
+ if (!netif_running(dev))
+ return -EINVAL;
+
+ if (cmd != SIOCGMIIPHY) {
+ if (mdio->phy_id >= PHY_MAX_ADDR)
+ return -ERANGE;
+
+ phy = priv->mdio->phy_map[mdio->phy_id];
+ if (!phy)
+ return -ENODEV;
+ } else {
+ phy = priv->phy;
+ }
+
+ return phy_mii_ioctl(phy, mdio, cmd);
+}
+
+static int ethoc_config(struct net_device *dev, struct ifmap *map)
+{
+ return -ENOSYS;
+}
+
+static int ethoc_set_mac_address(struct net_device *dev, void *addr)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ u8 *mac = (u8 *)addr;
+
+ ethoc_write(priv, MAC_ADDR0, (mac[2] << 24) | (mac[3] << 16) |
+ (mac[4] << 8) | (mac[5] << 0));
+ ethoc_write(priv, MAC_ADDR1, (mac[0] << 8) | (mac[1] << 0));
+
+ return 0;
+}
+
+static void ethoc_set_multicast_list(struct net_device *dev)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ u32 mode = ethoc_read(priv, MODER);
+ struct dev_mc_list *mc = NULL;
+ u32 hash[2] = { 0, 0 };
+
+ /* set loopback mode if requested */
+ if (dev->flags & IFF_LOOPBACK)
+ mode |= MODER_LOOP;
+ else
+ mode &= ~MODER_LOOP;
+
+ /* receive broadcast frames if requested */
+ if (dev->flags & IFF_BROADCAST)
+ mode &= ~MODER_BRO;
+ else
+ mode |= MODER_BRO;
+
+ /* enable promiscuous mode if requested */
+ if (dev->flags & IFF_PROMISC)
+ mode |= MODER_PRO;
+ else
+ mode &= ~MODER_PRO;
+
+ ethoc_write(priv, MODER, mode);
+
+ /* receive multicast frames */
+ if (dev->flags & IFF_ALLMULTI) {
+ hash[0] = 0xffffffff;
+ hash[1] = 0xffffffff;
+ } else {
+ for (mc = dev->mc_list; mc; mc = mc->next) {
+ u32 crc = ether_crc(mc->dmi_addrlen, mc->dmi_addr);
+ int bit = (crc >> 26) & 0x3f;
+ hash[bit >> 5] |= 1 << (bit & 0x1f);
+ }
+ }
+
+ ethoc_write(priv, ETH_HASH0, hash[0]);
+ ethoc_write(priv, ETH_HASH1, hash[1]);
+}
+
+static int ethoc_change_mtu(struct net_device *dev, int new_mtu)
+{
+ return -ENOSYS;
+}
+
+static void ethoc_tx_timeout(struct net_device *dev)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ u32 pending = ethoc_read(priv, INT_SOURCE);
+ if (likely(pending))
+ ethoc_interrupt(dev->irq, dev);
+}
+
+static struct net_device_stats *ethoc_stats(struct net_device *dev)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ return &priv->stats;
+}
+
+static int ethoc_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ethoc *priv = netdev_priv(dev);
+ struct ethoc_bd bd;
+ unsigned int entry;
+ void *dest;
+
+ if (unlikely(skb->len > ETHOC_BUFSIZ)) {
+ priv->stats.tx_errors++;
+ return -EMSGSIZE;
+ }
+
+ entry = priv->cur_tx % priv->num_tx;
+ spin_lock_irq(&priv->lock);
+ priv->cur_tx++;
+
+ ethoc_read_bd(priv, entry, &bd);
+ if (unlikely(skb->len < ETHOC_ZLEN))
+ bd.stat |= TX_BD_PAD;
+ else
+ bd.stat &= ~TX_BD_PAD;
+
+ dest = priv->membase + bd.addr;
+ memcpy_toio(dest, skb->data, skb->len);
+
+ bd.stat &= ~(TX_BD_STATS | TX_BD_LEN_MASK);
+ bd.stat |= TX_BD_LEN(skb->len);
+ ethoc_write_bd(priv, entry, &bd);
+
+ bd.stat |= TX_BD_READY;
+ ethoc_write_bd(priv, entry, &bd);
+
+ if (priv->cur_tx == (priv->dty_tx + priv->num_tx)) {
+ dev_dbg(&dev->dev, "stopping queue\n");
+ netif_stop_queue(dev);
+ }
+
+ dev->trans_start = jiffies;
+ dev_kfree_skb(skb);
+
+ spin_unlock_irq(&priv->lock);
+ return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops ethoc_netdev_ops = {
+ .ndo_open = ethoc_open,
+ .ndo_stop = ethoc_stop,
+ .ndo_do_ioctl = ethoc_ioctl,
+ .ndo_set_config = ethoc_config,
+ .ndo_set_mac_address = ethoc_set_mac_address,
+ .ndo_set_multicast_list = ethoc_set_multicast_list,
+ .ndo_change_mtu = ethoc_change_mtu,
+ .ndo_tx_timeout = ethoc_tx_timeout,
+ .ndo_get_stats = ethoc_stats,
+ .ndo_start_xmit = ethoc_start_xmit,
+};
+
+/**
+ * ethoc_probe() - initialize OpenCores ethernet MAC
+ * pdev: platform device
+ */
+static int ethoc_probe(struct platform_device *pdev)
+{
+ struct net_device *netdev = NULL;
+ struct resource *res = NULL;
+ struct resource *mmio = NULL;
+ struct resource *mem = NULL;
+ struct ethoc *priv = NULL;
+ unsigned int phy;
+ int ret = 0;
+
+ /* allocate networking device */
+ netdev = alloc_etherdev(sizeof(struct ethoc));
+ if (!netdev) {
+ dev_err(&pdev->dev, "cannot allocate network device\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ SET_NETDEV_DEV(netdev, &pdev->dev);
+ platform_set_drvdata(pdev, netdev);
+
+ /* obtain I/O memory space */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "cannot obtain I/O memory space\n");
+ ret = -ENXIO;
+ goto free;
+ }
+
+ mmio = devm_request_mem_region(&pdev->dev, res->start,
+ res->end - res->start + 1, res->name);
+ if (!res) {
+ dev_err(&pdev->dev, "cannot request I/O memory space\n");
+ ret = -ENXIO;
+ goto free;
+ }
+
+ netdev->base_addr = mmio->start;
+
+ /* obtain buffer memory space */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res) {
+ dev_err(&pdev->dev, "cannot obtain memory space\n");
+ ret = -ENXIO;
+ goto free;
+ }
+
+ mem = devm_request_mem_region(&pdev->dev, res->start,
+ res->end - res->start + 1, res->name);
+ if (!mem) {
+ dev_err(&pdev->dev, "cannot request memory space\n");
+ ret = -ENXIO;
+ goto free;
+ }
+
+ netdev->mem_start = mem->start;
+ netdev->mem_end = mem->end;
+
+ /* obtain device IRQ number */
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!res) {
+ dev_err(&pdev->dev, "cannot obtain IRQ\n");
+ ret = -ENXIO;
+ goto free;
+ }
+
+ netdev->irq = res->start;
+
+ /* setup driver-private data */
+ priv = netdev_priv(netdev);
+ priv->netdev = netdev;
+
+ priv->iobase = devm_ioremap_nocache(&pdev->dev, netdev->base_addr,
+ mmio->end - mmio->start + 1);
+ if (!priv->iobase) {
+ dev_err(&pdev->dev, "cannot remap I/O memory space\n");
+ ret = -ENXIO;
+ goto error;
+ }
+
+ priv->membase = devm_ioremap_nocache(&pdev->dev, netdev->mem_start,
+ mem->end - mem->start + 1);
+ if (!priv->membase) {
+ dev_err(&pdev->dev, "cannot remap memory space\n");
+ ret = -ENXIO;
+ goto error;
+ }
+
+ /* Allow the platform setup code to pass in a MAC address. */
+ if (pdev->dev.platform_data) {
+ struct ethoc_platform_data *pdata =
+ (struct ethoc_platform_data *)pdev->dev.platform_data;
+ memcpy(netdev->dev_addr, pdata->hwaddr, IFHWADDRLEN);
+ priv->phy_id = pdata->phy_id;
+ }
+
+ /* Check that the given MAC address is valid. If it isn't, read the
+ * current MAC from the controller. */
+ if (!is_valid_ether_addr(netdev->dev_addr))
+ ethoc_get_mac_address(netdev, netdev->dev_addr);
+
+ /* Check the MAC again for validity, if it still isn't choose and
+ * program a random one. */
+ if (!is_valid_ether_addr(netdev->dev_addr))
+ random_ether_addr(netdev->dev_addr);
+
+ ethoc_set_mac_address(netdev, netdev->dev_addr);
+
+ /* register MII bus */
+ priv->mdio = mdiobus_alloc();
+ if (!priv->mdio) {
+ ret = -ENOMEM;
+ goto free;
+ }
+
+ priv->mdio->name = "ethoc-mdio";
+ snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "%s-%d",
+ priv->mdio->name, pdev->id);
+ priv->mdio->read = ethoc_mdio_read;
+ priv->mdio->write = ethoc_mdio_write;
+ priv->mdio->reset = ethoc_mdio_reset;
+ priv->mdio->priv = priv;
+
+ priv->mdio->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
+ if (!priv->mdio->irq) {
+ ret = -ENOMEM;
+ goto free_mdio;
+ }
+
+ for (phy = 0; phy < PHY_MAX_ADDR; phy++)
+ priv->mdio->irq[phy] = PHY_POLL;
+
+ ret = mdiobus_register(priv->mdio);
+ if (ret) {
+ dev_err(&netdev->dev, "failed to register MDIO bus\n");
+ goto free_mdio;
+ }
+
+ ret = ethoc_mdio_probe(netdev);
+ if (ret) {
+ dev_err(&netdev->dev, "failed to probe MDIO bus\n");
+ goto error;
+ }
+
+ ether_setup(netdev);
+
+ /* setup the net_device structure */
+ netdev->netdev_ops = ðoc_netdev_ops;
+ netdev->watchdog_timeo = ETHOC_TIMEOUT;
+ netdev->features |= 0;
+
+ /* setup NAPI */
+ memset(&priv->napi, 0, sizeof(priv->napi));
+ netif_napi_add(netdev, &priv->napi, ethoc_poll, 64);
+
+ spin_lock_init(&priv->rx_lock);
+ spin_lock_init(&priv->lock);
+
+ ret = register_netdev(netdev);
+ if (ret < 0) {
+ dev_err(&netdev->dev, "failed to register interface\n");
+ goto error;
+ }
+
+ goto out;
+
+error:
+ mdiobus_unregister(priv->mdio);
+free_mdio:
+ kfree(priv->mdio->irq);
+ mdiobus_free(priv->mdio);
+free:
+ free_netdev(netdev);
+out:
+ return ret;
+}
+
+/**
+ * ethoc_remove() - shutdown OpenCores ethernet MAC
+ * @pdev: platform device
+ */
+static int ethoc_remove(struct platform_device *pdev)
+{
+ struct net_device *netdev = platform_get_drvdata(pdev);
+ struct ethoc *priv = netdev_priv(netdev);
+
+ platform_set_drvdata(pdev, NULL);
+
+ if (netdev) {
+ phy_disconnect(priv->phy);
+ priv->phy = NULL;
+
+ if (priv->mdio) {
+ mdiobus_unregister(priv->mdio);
+ kfree(priv->mdio->irq);
+ mdiobus_free(priv->mdio);
+ }
+
+ unregister_netdev(netdev);
+ free_netdev(netdev);
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int ethoc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ return -ENOSYS;
+}
+
+static int ethoc_resume(struct platform_device *pdev)
+{
+ return -ENOSYS;
+}
+#else
+# define ethoc_suspend NULL
+# define ethoc_resume NULL
+#endif
+
+static struct platform_driver ethoc_driver = {
+ .probe = ethoc_probe,
+ .remove = ethoc_remove,
+ .suspend = ethoc_suspend,
+ .resume = ethoc_resume,
+ .driver = {
+ .name = "ethoc",
+ },
+};
+
+static int __init ethoc_init(void)
+{
+ return platform_driver_register(ðoc_driver);
+}
+
+static void __exit ethoc_exit(void)
+{
+ platform_driver_unregister(ðoc_driver);
+}
+
+module_init(ethoc_init);
+module_exit(ethoc_exit);
+
+MODULE_AUTHOR("Thierry Reding <thierry.reding@avionic-design.de>");
+MODULE_DESCRIPTION("OpenCores Ethernet MAC driver");
+MODULE_LICENSE("GPL v2");
+
projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / commitdiff