tg3: add support for Ethernet core in bcm4785

The BCM4785 or sometimes named BMC4705 is a Broadcom SoC which a
Gigabit 5750 Ethernet core. The core is connected via PCI with the rest
of the SoC, but it uses some extension.

This core does not use a firmware or an eeprom.

Some devices only have a switch which supports 100MBit/s, this
currently does not work with this driver.

This patch was original written by Michael Buesch <m@bues.ch> and is in
OpenWrt for some years now.

This was tested on a Linksys WRT610N V1 and older versions of this patch
were tested by other people on different devices.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Acked-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index d9e81d6be7b9f6da12125d6bcad2caee4b7c3496..b1b3bc01cbc2be6f505b6ebd80335c00c5f29721 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -44,6 +44,7 @@
 #include <linux/prefetch.h>
 #include <linux/dma-mapping.h>
 #include <linux/firmware.h>
+#include <linux/ssb/ssb_driver_gige.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 
@@ -263,6 +264,7 @@ static DEFINE_PCI_DEVICE_TABLE(tg3_pci_tbl) = {
                        TG3_DRV_DATA_FLAG_5705_10_100},
        {PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5721)},
        {PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5722)},
+       {PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5750)},
        {PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5751)},
        {PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5751M)},
        {PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, PCI_DEVICE_ID_TIGON3_5751F),
@@ -573,7 +575,9 @@ static void _tw32_flush(struct tg3 *tp, u32 off, u32 val, u32 usec_wait)
 static inline void tw32_mailbox_flush(struct tg3 *tp, u32 off, u32 val)
 {
        tp->write32_mbox(tp, off, val);
-       if (!tg3_flag(tp, MBOX_WRITE_REORDER) && !tg3_flag(tp, ICH_WORKAROUND))
+       if (tg3_flag(tp, FLUSH_POSTED_WRITES) ||
+           (!tg3_flag(tp, MBOX_WRITE_REORDER) &&
+            !tg3_flag(tp, ICH_WORKAROUND)))
                tp->read32_mbox(tp, off);
 }
 
@@ -583,7 +587,8 @@ static void tg3_write32_tx_mbox(struct tg3 *tp, u32 off, u32 val)
        writel(val, mbox);
        if (tg3_flag(tp, TXD_MBOX_HWBUG))
                writel(val, mbox);
-       if (tg3_flag(tp, MBOX_WRITE_REORDER))
+       if (tg3_flag(tp, MBOX_WRITE_REORDER) ||
+           tg3_flag(tp, FLUSH_POSTED_WRITES))
                readl(mbox);
 }
 
@@ -1793,6 +1798,11 @@ static int tg3_poll_fw(struct tg3 *tp)
        int i;
        u32 val;
 
+       if (tg3_flag(tp, IS_SSB_CORE)) {
+               /* We don't use firmware. */
+               return 0;
+       }
+
        if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5906) {
                /* Wait up to 20ms for init done. */
                for (i = 0; i < 200; i++) {
@@ -3465,6 +3475,13 @@ static int tg3_halt_cpu(struct tg3 *tp, u32 offset)
                tw32_f(offset + CPU_MODE,  CPU_MODE_HALT);
                udelay(10);
        } else {
+               /*
+                * There is only an Rx CPU for the 5750 derivative in the
+                * BCM4785.
+                */
+               if (tg3_flag(tp, IS_SSB_CORE))
+                       return 0;
+
                for (i = 0; i < 10000; i++) {
                        tw32(offset + CPU_STATE, 0xffffffff);
                        tw32(offset + CPU_MODE,  CPU_MODE_HALT);
@@ -3932,8 +3949,9 @@ static int tg3_power_down_prepare(struct tg3 *tp)
        tg3_frob_aux_power(tp, true);
 
        /* Workaround for unstable PLL clock */
-       if ((GET_CHIP_REV(tp->pci_chip_rev_id) == CHIPREV_5750_AX) ||
-           (GET_CHIP_REV(tp->pci_chip_rev_id) == CHIPREV_5750_BX)) {
+       if ((!tg3_flag(tp, IS_SSB_CORE)) &&
+           ((GET_CHIP_REV(tp->pci_chip_rev_id) == CHIPREV_5750_AX) ||
+            (GET_CHIP_REV(tp->pci_chip_rev_id) == CHIPREV_5750_BX))) {
                u32 val = tr32(0x7d00);
 
                val &= ~((1 << 16) | (1 << 4) | (1 << 2) | (1 << 1) | 1);
@@ -4454,6 +4472,15 @@ relink:
        if (current_link_up == 0 || (tp->phy_flags & TG3_PHYFLG_IS_LOW_POWER)) {
                tg3_phy_copper_begin(tp);
 
+               if (tg3_flag(tp, ROBOSWITCH)) {
+                       current_link_up = 1;
+                       /* FIXME: when BCM5325 switch is used use 100 MBit/s */
+                       current_speed = SPEED_1000;
+                       current_duplex = DUPLEX_FULL;
+                       tp->link_config.active_speed = current_speed;
+                       tp->link_config.active_duplex = current_duplex;
+               }
+
                tg3_readphy(tp, MII_BMSR, &bmsr);
                if ((!tg3_readphy(tp, MII_BMSR, &bmsr) && (bmsr & BMSR_LSTATUS)) ||
                    (tp->mac_mode & MAC_MODE_PORT_INT_LPBACK))
@@ -4472,6 +4499,26 @@ relink:
        else
                tp->mac_mode |= MAC_MODE_PORT_MODE_GMII;
 
+       /* In order for the 5750 core in BCM4785 chip to work properly
+        * in RGMII mode, the Led Control Register must be set up.
+        */
+       if (tg3_flag(tp, RGMII_MODE)) {
+               u32 led_ctrl = tr32(MAC_LED_CTRL);
+               led_ctrl &= ~(LED_CTRL_1000MBPS_ON | LED_CTRL_100MBPS_ON);
+
+               if (tp->link_config.active_speed == SPEED_10)
+                       led_ctrl |= LED_CTRL_LNKLED_OVERRIDE;
+               else if (tp->link_config.active_speed == SPEED_100)
+                       led_ctrl |= (LED_CTRL_LNKLED_OVERRIDE |
+                                    LED_CTRL_100MBPS_ON);
+               else if (tp->link_config.active_speed == SPEED_1000)
+                       led_ctrl |= (LED_CTRL_LNKLED_OVERRIDE |
+                                    LED_CTRL_1000MBPS_ON);
+
+               tw32(MAC_LED_CTRL, led_ctrl);
+               udelay(40);
+       }
+
        tp->mac_mode &= ~MAC_MODE_HALF_DUPLEX;
        if (tp->link_config.active_duplex == DUPLEX_HALF)
                tp->mac_mode |= MAC_MODE_HALF_DUPLEX;
@@ -8449,6 +8496,16 @@ static int tg3_chip_reset(struct tg3 *tp)
                tw32(0x5000, 0x400);
        }
 
+       if (tg3_flag(tp, IS_SSB_CORE)) {
+               /*
+                * BCM4785: In order to avoid repercussions from using
+                * potentially defective internal ROM, stop the Rx RISC CPU,
+                * which is not required.
+                */
+               tg3_stop_fw(tp);
+               tg3_halt_cpu(tp, RX_CPU_BASE);
+       }
+
        tw32(GRC_MODE, tp->grc_mode);
 
        if (tp->pci_chip_rev_id == CHIPREV_ID_5705_A0) {
@@ -10107,6 +10164,11 @@ static void tg3_timer(unsigned long __opaque)
            tg3_flag(tp, 57765_CLASS))
                tg3_chk_missed_msi(tp);
 
+       if (tg3_flag(tp, FLUSH_POSTED_WRITES)) {
+               /* BCM4785: Flush posted writes from GbE to host memory. */
+               tr32(HOSTCC_MODE);
+       }
+
        if (!tg3_flag(tp, TAGGED_STATUS)) {
                /* All of this garbage is because when using non-tagged
                 * IRQ status the mailbox/status_block protocol the chip
@@ -13879,6 +13941,14 @@ static void tg3_get_5720_nvram_info(struct tg3 *tp)
 /* Chips other than 5700/5701 use the NVRAM for fetching info. */
 static void tg3_nvram_init(struct tg3 *tp)
 {
+       if (tg3_flag(tp, IS_SSB_CORE)) {
+               /* No NVRAM and EEPROM on the SSB Broadcom GigE core. */
+               tg3_flag_clear(tp, NVRAM);
+               tg3_flag_clear(tp, NVRAM_BUFFERED);
+               tg3_flag_set(tp, NO_NVRAM);
+               return;
+       }
+
        tw32_f(GRC_EEPROM_ADDR,
             (EEPROM_ADDR_FSM_RESET |
              (EEPROM_DEFAULT_CLOCK_PERIOD <<
@@ -14405,10 +14475,19 @@ static int tg3_phy_probe(struct tg3 *tp)
                         * subsys device table.
                         */
                        p = tg3_lookup_by_subsys(tp);
-                       if (!p)
+                       if (p) {
+                               tp->phy_id = p->phy_id;
+                       } else if (!tg3_flag(tp, IS_SSB_CORE)) {
+                               /* For now we saw the IDs 0xbc050cd0,
+                                * 0xbc050f80 and 0xbc050c30 on devices
+                                * connected to an BCM4785 and there are
+                                * probably more. Just assume that the phy is
+                                * supported when it is connected to a SSB core
+                                * for now.
+                                */
                                return -ENODEV;
+                       }
 
-                       tp->phy_id = p->phy_id;
                        if (!tp->phy_id ||
                            tp->phy_id == TG3_PHY_ID_BCM8002)
                                tp->phy_flags |= TG3_PHYFLG_PHY_SERDES;
@@ -15484,6 +15563,11 @@ static int tg3_get_invariants(struct tg3 *tp, const struct pci_device_id *ent)
                                     TG3_CPMU_STATUS_FSHFT_5719;
        }
 
+       if (tg3_flag(tp, FLUSH_POSTED_WRITES)) {
+               tp->write32_tx_mbox = tg3_write_flush_reg32;
+               tp->write32_rx_mbox = tg3_write_flush_reg32;
+       }
+
        /* Get eeprom hw config before calling tg3_set_power_state().
         * In particular, the TG3_FLAG_IS_NIC flag must be
         * determined before calling tg3_set_power_state() so that
@@ -15820,12 +15904,19 @@ static int tg3_get_device_address(struct tg3 *tp)
        struct net_device *dev = tp->dev;
        u32 hi, lo, mac_offset;
        int addr_ok = 0;
+       int err;
 
 #ifdef CONFIG_SPARC
        if (!tg3_get_macaddr_sparc(tp))
                return 0;
 #endif
 
+       if (tg3_flag(tp, IS_SSB_CORE)) {
+               err = ssb_gige_get_macaddr(tp->pdev, &dev->dev_addr[0]);
+               if (!err && is_valid_ether_addr(&dev->dev_addr[0]))
+                       return 0;
+       }
+
        mac_offset = 0x7c;
        if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5704 ||
            tg3_flag(tp, 5780_CLASS)) {
@@ -16185,6 +16276,8 @@ static int tg3_test_dma(struct tg3 *tp)
                        tp->dma_rwctrl |= 0x001b000f;
                }
        }
+       if (tg3_flag(tp, ONE_DMA_AT_ONCE))
+               tp->dma_rwctrl |= DMA_RWCTRL_ONE_DMA;
 
        if (GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5703 ||
            GET_ASIC_REV(tp->pci_chip_rev_id) == ASIC_REV_5704)
@@ -16530,6 +16623,18 @@ static int tg3_init_one(struct pci_dev *pdev,
        else
                tp->msg_enable = TG3_DEF_MSG_ENABLE;
 
+       if (pdev_is_ssb_gige_core(pdev)) {
+               tg3_flag_set(tp, IS_SSB_CORE);
+               if (ssb_gige_must_flush_posted_writes(pdev))
+                       tg3_flag_set(tp, FLUSH_POSTED_WRITES);
+               if (ssb_gige_one_dma_at_once(pdev))
+                       tg3_flag_set(tp, ONE_DMA_AT_ONCE);
+               if (ssb_gige_have_roboswitch(pdev))
+                       tg3_flag_set(tp, ROBOSWITCH);
+               if (ssb_gige_is_rgmii(pdev))
+                       tg3_flag_set(tp, RGMII_MODE);
+       }
+
        /* The word/byte swap controls here control register access byte
         * swapping.  DMA data byte swapping is controlled in the GRC_MODE
         * setting below.

diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h
index 9cd88a4b9a5f58fdf4f168258269cda476563c87..ef6ced2bf9c3acd339e2f6a0497cbd7cdabdb978 100644 (file)
--- a/drivers/net/ethernet/broadcom/tg3.h
+++ b/drivers/net/ethernet/broadcom/tg3.h
@@ -3056,6 +3056,11 @@ enum TG3_FLAGS {
        TG3_FLAG_57765_PLUS,
        TG3_FLAG_57765_CLASS,
        TG3_FLAG_5717_PLUS,
+       TG3_FLAG_IS_SSB_CORE,
+       TG3_FLAG_FLUSH_POSTED_WRITES,
+       TG3_FLAG_ROBOSWITCH,
+       TG3_FLAG_ONE_DMA_AT_ONCE,
+       TG3_FLAG_RGMII_MODE,
 
        /* Add new flags before this comment and TG3_FLAG_NUMBER_OF_FLAGS */
        TG3_FLAG_NUMBER_OF_FLAGS,       /* Last entry in enum TG3_FLAGS */

diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index 0eb65796bcb9af7f5876c300608e7caebdfe6297..907e7e56fa4be74395c9209761bc6482e4a1d3a0 100644 (file)
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -2127,6 +2127,7 @@
 #define PCI_DEVICE_ID_TIGON3_5754M     0x1672
 #define PCI_DEVICE_ID_TIGON3_5755M     0x1673
 #define PCI_DEVICE_ID_TIGON3_5756      0x1674
+#define PCI_DEVICE_ID_TIGON3_5750      0x1676
 #define PCI_DEVICE_ID_TIGON3_5751      0x1677
 #define PCI_DEVICE_ID_TIGON3_5715      0x1678
 #define PCI_DEVICE_ID_TIGON3_5715S     0x1679