ar71xx: fix ethernet FIFO state corruption on ar7240

[openwrt.git] / target / linux / ar71xx / files / drivers / net / ag71xx / ag71xx_main.c

diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
index f0f4d23..ed9e7b9 100644 (file)
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
@@ -374,8 +374,8 @@ static void ag71xx_dma_reset(struct ag71xx *ag)
        mdelay(1);
 
        /* clear descriptor addresses */
-       ag71xx_wr(ag, AG71XX_REG_TX_DESC, 0);
-       ag71xx_wr(ag, AG71XX_REG_RX_DESC, 0);
+       ag71xx_wr(ag, AG71XX_REG_TX_DESC, ag->stop_desc_dma);
+       ag71xx_wr(ag, AG71XX_REG_RX_DESC, ag->stop_desc_dma);
 
        /* clear pending RX/TX interrupts */
        for (i = 0; i < 256; i++) {
@@ -423,17 +423,17 @@ static void ag71xx_dma_reset(struct ag71xx *ag)
                         FIFO_CFG5_LE | FIFO_CFG5_FT | FIFO_CFG5_16 | \
                         FIFO_CFG5_17 | FIFO_CFG5_SF)
 
-static void ag71xx_hw_init(struct ag71xx *ag)
+static void ag71xx_hw_stop(struct ag71xx *ag)
 {
-       struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
-
-       ag71xx_sb(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_SR);
-       udelay(20);
+       /* disable all interrupts and stop the rx/tx engine */
+       ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
+       ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
+       ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
+}
 
-       ar71xx_device_stop(pdata->reset_bit);
-       mdelay(100);
-       ar71xx_device_start(pdata->reset_bit);
-       mdelay(200);
+static void ag71xx_hw_setup(struct ag71xx *ag)
+{
+       struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 
        /* setup MAC configuration registers */
        ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_INIT);
@@ -458,10 +458,69 @@ static void ag71xx_hw_init(struct ag71xx *ag)
        }
        ag71xx_wr(ag, AG71XX_REG_FIFO_CFG4, FIFO_CFG4_INIT);
        ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, FIFO_CFG5_INIT);
+}
+
+static void ag71xx_hw_init(struct ag71xx *ag)
+{
+       struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
+       u32 reset_mask = pdata->reset_bit;
+
+       ag71xx_hw_stop(ag);
+
+       if (pdata->is_ar724x) {
+               u32 reset_phy = reset_mask;
+
+               reset_phy &= RESET_MODULE_GE0_PHY | RESET_MODULE_GE1_PHY;
+               reset_mask &= ~(RESET_MODULE_GE0_PHY | RESET_MODULE_GE1_PHY);
+
+               ar71xx_device_stop(reset_phy);
+               mdelay(50);
+               ar71xx_device_start(reset_phy);
+               mdelay(200);
+       }
+
+       ag71xx_sb(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_SR);
+       udelay(20);
+
+       ar71xx_device_stop(reset_mask);
+       mdelay(100);
+       ar71xx_device_start(reset_mask);
+       mdelay(200);
+
+       ag71xx_hw_setup(ag);
 
        ag71xx_dma_reset(ag);
 }
 
+static void ag71xx_fast_reset(struct ag71xx *ag)
+{
+       struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
+       struct net_device *dev = ag->dev;
+       u32 reset_mask = pdata->reset_bit;
+       u32 rx_ds, tx_ds;
+       u32 mii_reg;
+
+       reset_mask &= RESET_MODULE_GE0_MAC | RESET_MODULE_GE1_MAC;
+
+       mii_reg = ag71xx_rr(ag, AG71XX_REG_MII_CFG);
+       rx_ds = ag71xx_rr(ag, AG71XX_REG_RX_DESC);
+       tx_ds = ag71xx_rr(ag, AG71XX_REG_TX_DESC);
+
+       ar71xx_device_stop(reset_mask);
+       udelay(10);
+       ar71xx_device_start(reset_mask);
+       udelay(10);
+
+       ag71xx_dma_reset(ag);
+       ag71xx_hw_setup(ag);
+
+       ag71xx_wr(ag, AG71XX_REG_RX_DESC, rx_ds);
+       ag71xx_wr(ag, AG71XX_REG_TX_DESC, tx_ds);
+       ag71xx_wr(ag, AG71XX_REG_MII_CFG, mii_reg);
+
+       ag71xx_hw_set_macaddr(ag, dev->dev_addr);
+}
+
 static void ag71xx_hw_start(struct ag71xx *ag)
 {
        /* start RX engine */
@@ -471,13 +530,6 @@ static void ag71xx_hw_start(struct ag71xx *ag)
        ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, AG71XX_INT_INIT);
 }
 
-static void ag71xx_hw_stop(struct ag71xx *ag)
-{
-       /* disable all interrupts and stop the rx engine */
-       ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
-       ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
-}
-
 void ag71xx_link_adjust(struct ag71xx *ag)
 {
        struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
@@ -494,6 +546,9 @@ void ag71xx_link_adjust(struct ag71xx *ag)
                return;
        }
 
+       if (pdata->is_ar724x)
+               ag71xx_fast_reset(ag);
+
        cfg2 = ag71xx_rr(ag, AG71XX_REG_MAC_CFG2);
        cfg2 &= ~(MAC_CFG2_IF_1000 | MAC_CFG2_IF_10_100 | MAC_CFG2_FDX);
        cfg2 |= (ag->duplex) ? MAC_CFG2_FDX : 0;
@@ -1070,6 +1125,16 @@ static int __devinit ag71xx_probe(struct platform_device *pdev)
        ag->tx_ring.size = AG71XX_TX_RING_SIZE_DEFAULT;
        ag->rx_ring.size = AG71XX_RX_RING_SIZE_DEFAULT;
 
+       ag->stop_desc = dma_alloc_coherent(NULL,
+               sizeof(struct ag71xx_desc), &ag->stop_desc_dma, GFP_KERNEL);
+
+       if (!ag->stop_desc)
+               goto err_free_irq;
+
+       ag->stop_desc->data = 0;
+       ag->stop_desc->ctrl = 0;
+       ag->stop_desc->next = (u32) ag->stop_desc_dma;
+
        memcpy(dev->dev_addr, pdata->mac_addr, ETH_ALEN);
 
        netif_napi_add(dev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT);
@@ -1077,7 +1142,7 @@ static int __devinit ag71xx_probe(struct platform_device *pdev)
        err = register_netdev(dev);
        if (err) {
                dev_err(&pdev->dev, "unable to register net device\n");
-               goto err_free_irq;
+               goto err_free_desc;
        }
 
        printk(KERN_INFO "%s: Atheros AG71xx at 0x%08lx, irq %d\n",
@@ -1105,6 +1170,9 @@ err_phy_disconnect:
        ag71xx_phy_disconnect(ag);
 err_unregister_netdev:
        unregister_netdev(dev);
+err_free_desc:
+       dma_free_coherent(NULL, sizeof(struct ag71xx_desc), ag->stop_desc,
+                         ag->stop_desc_dma);
 err_free_irq:
        free_irq(dev->irq, dev);
 err_unmap_mii_ctrl: