target/linux/ar7/patches-2.6.24/140-cpmac_fix.patch

   1 --- linux-2.6.24/drivers/net/cpmac.c    2008-01-25 02:20:37.000000000 +0100
   2 +++ linux-2.6.24/drivers/net/cpmac.c    2008-02-08 20:04:58.000000000 +0100
   3 @@ -38,6 +38,7 @@
   4  #include <linux/platform_device.h>
   5  #include <linux/dma-mapping.h>
   6  #include <asm/gpio.h>
   7 +#include <asm/atomic.h>
   8
   9  MODULE_AUTHOR("Eugene Konev <ejka@imfi.kspu.ru>");
  10  MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)");
  11 @@ -207,6 +208,7 @@
  12         struct work_struct reset_work;
  13         struct platform_device *pdev;
  14         struct napi_struct napi;
  15 +       atomic_t reset_pending;
  16  };
  17
  18  static irqreturn_t cpmac_irq(int, void *);
  19 @@ -455,6 +457,9 @@
  20         struct cpmac_desc *desc;
  21         struct cpmac_priv *priv = netdev_priv(dev);
  22
  23 +       if (unlikely(atomic_read(&priv->reset_pending)))
  24 +               return NETDEV_TX_BUSY;
  25 +
  26         if (unlikely(skb_padto(skb, ETH_ZLEN)))
  27                 return NETDEV_TX_OK;
  28
  29 @@ -634,14 +639,14 @@
  30                 priv->desc_ring[i].dataflags = 0;
  31                 if (priv->desc_ring[i].skb) {
  32                         dev_kfree_skb_any(priv->desc_ring[i].skb);
  33 -                       if (netif_subqueue_stopped(dev, i))
  34 -                           netif_wake_subqueue(dev, i);
  35 +                       priv->desc_ring[i].skb = NULL;
  36                 }
  37         }
  38  }
  39
  40  static void cpmac_hw_error(struct work_struct *work)
  41  {
  42 +       int i;
  43         struct cpmac_priv *priv =
  44                 container_of(work, struct cpmac_priv, reset_work);
  45
  46 @@ -650,8 +655,46 @@
  47         spin_unlock(&priv->rx_lock);
  48         cpmac_clear_tx(priv->dev);
  49         cpmac_hw_start(priv->dev);
  50 +       barrier();
  51 +       atomic_dec(&priv->reset_pending);
  52 +
  53 +       for (i = 0; i < CPMAC_QUEUES; i++) {
  54 +               netif_wake_subqueue(priv->dev, i);
  55 +       }
  56 +       netif_wake_queue(priv->dev);
  57 +}
  58 +
  59 +static void cpmac_check_status(struct net_device *dev)
  60 +{
  61 +       struct cpmac_priv *priv = netdev_priv(dev);
  62 +
  63 +       u32 macstatus = cpmac_read(priv->regs, CPMAC_MAC_STATUS);
  64 +       int rx_channel = (macstatus >> 8) & 7;
  65 +       int rx_code = (macstatus >> 12) & 15;
  66 +       int tx_channel = (macstatus >> 16) & 7;
  67 +       int tx_code = (macstatus >> 20) & 15;
  68 +
  69 +       if (rx_code || tx_code) {
  70 +               if (netif_msg_drv(priv) && net_ratelimit()) {
  71 +                       /* Can't find any documentation on what these error codes actually are.
  72 +                        * So just log them and hope..
  73 +                        */
  74 +                       if (rx_code)
  75 +                               printk(KERN_WARNING "%s: host error %d on rx channel %d (macstatus %08x), resetting\n",
  76 +                                      dev->name, rx_code, rx_channel, macstatus);
  77 +                       if (tx_code)
  78 +                               printk(KERN_WARNING "%s: host error %d on tx channel %d (macstatus %08x), resetting\n",
  79 +                                      dev->name, tx_code, tx_channel, macstatus);
  80 +               }
  81 +
  82 +               netif_stop_queue(dev);
  83 +               cpmac_hw_stop(dev);
  84 +               if (schedule_work(&priv->reset_work))
  85 +                       atomic_inc(&priv->reset_pending);
  86 +               if (unlikely(netif_msg_hw(priv)))
  87 +                       cpmac_dump_regs(dev);
  88 +       }
  89         napi_enable(&priv->napi);
  90 -       netif_start_queue(priv->dev);
  91  }
  92
  93  static irqreturn_t cpmac_irq(int irq, void *dev_id)
  94 @@ -661,9 +704,6 @@
  95         int queue;
  96         u32 status;
  97
  98 -       if (!dev)
  99 -               return IRQ_NONE;
 100 -
 101         priv = netdev_priv(dev);
 102
 103         status = cpmac_read(priv->regs, CPMAC_MAC_INT_VECTOR);
 104 @@ -685,49 +725,33 @@
 105
 106         cpmac_write(priv->regs, CPMAC_MAC_EOI_VECTOR, 0);
 107
 108 -       if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS))) {
 109 -               if (netif_msg_drv(priv) && net_ratelimit())
 110 -                       printk(KERN_ERR "%s: hw error, resetting...\n",
 111 -                              dev->name);
 112 -               netif_stop_queue(dev);
 113 -               napi_disable(&priv->napi);
 114 -               cpmac_hw_stop(dev);
 115 -               schedule_work(&priv->reset_work);
 116 -               if (unlikely(netif_msg_hw(priv)))
 117 -                       cpmac_dump_regs(dev);
 118 -       }
 119 +       if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS)))
 120 +               cpmac_check_status(dev);
 121
 122         return IRQ_HANDLED;
 123  }
 124
 125  static void cpmac_tx_timeout(struct net_device *dev)
 126  {
 127 -       struct cpmac_priv *priv = netdev_priv(dev);
 128         int i;
 129 +       struct cpmac_priv *priv = netdev_priv(dev);
 130
 131         spin_lock(&priv->lock);
 132         dev->stats.tx_errors++;
 133         spin_unlock(&priv->lock);
 134         if (netif_msg_tx_err(priv) && net_ratelimit())
 135                 printk(KERN_WARNING "%s: transmit timeout\n", dev->name);
 136 -       /*
 137 -        * FIXME: waking up random queue is not the best thing to
 138 -        * do... on the other hand why we got here at all?
 139 -        */
 140 -#ifdef CONFIG_NETDEVICES_MULTIQUEUE
 141 -       for (i = 0; i < CPMAC_QUEUES; i++)
 142 -               if (priv->desc_ring[i].skb) {
 143 -                       priv->desc_ring[i].dataflags = 0;
 144 -                       dev_kfree_skb_any(priv->desc_ring[i].skb);
 145 -                       netif_wake_subqueue(dev, i);
 146 -                       break;
 147 -               }
 148 -#else
 149 -       priv->desc_ring[0].dataflags = 0;
 150 -       if (priv->desc_ring[0].skb)
 151 -               dev_kfree_skb_any(priv->desc_ring[0].skb);
 152 -       netif_wake_queue(dev);
 153 -#endif
 154 +
 155 +       atomic_inc(&priv->reset_pending);
 156 +       barrier();
 157 +       cpmac_clear_tx(dev);
 158 +       barrier();
 159 +       atomic_dec(&priv->reset_pending);
 160 +
 161 +       netif_wake_queue(priv->dev);
 162 +       for (i = 0; i < CPMAC_QUEUES; i++) {
 163 +               netif_wake_subqueue(dev, i);
 164 +       }
 165  }
 166
 167  static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 168 @@ -848,15 +872,6 @@
 169         spin_unlock(&priv->lock);
 170  }
 171
 172 -static int cpmac_link_update(struct net_device *dev,
 173 -                            struct fixed_phy_status *status)
 174 -{
 175 -       status->link = 1;
 176 -       status->speed = 100;
 177 -       status->duplex = 1;
 178 -       return 0;
 179 -}
 180 -
 181  static int cpmac_open(struct net_device *dev)
 182  {
 183         int i, size, res;
 184 @@ -923,6 +938,7 @@
 185                 goto fail_irq;
 186         }
 187
 188 +       atomic_set(&priv->reset_pending, 0);
 189         INIT_WORK(&priv->reset_work, cpmac_hw_error);
 190         cpmac_hw_start(dev);
 191
 192 @@ -999,11 +1015,11 @@
 193  static int __devinit cpmac_probe(struct platform_device *pdev)
 194  {
 195         int rc, phy_id, i;
 196 +       int mdio_bus_id = cpmac_mii.id;
 197         struct resource *mem;
 198         struct cpmac_priv *priv;
 199         struct net_device *dev;
 200         struct plat_cpmac_data *pdata;
 201 -       struct fixed_info *fixed_phy;
 202         DECLARE_MAC_BUF(mac);
 203
 204         pdata = pdev->dev.platform_data;
 205 @@ -1017,9 +1033,23 @@
 206         }
 207
 208         if (phy_id == PHY_MAX_ADDR) {
 209 -               if (external_switch || dumb_switch)
 210 +               if (external_switch || dumb_switch) {
 211 +                       struct fixed_phy_status status = {};
 212 +
 213 +                       mdio_bus_id = 0;
 214 +
 215 +                       /*
 216 +                        * FIXME: this should be in the platform code!
 217 +                        * Since there is not platform code at all (that is,
 218 +                        * no mainline users of that driver), place it here
 219 +                        * for now.
 220 +                        */
 221                         phy_id = 0;
 222 -               else {
 223 +                       status.link = 1;
 224 +                       status.duplex = 1;
 225 +                       status.speed = 100;
 226 +                       fixed_phy_add(PHY_POLL, phy_id, &status);
 227 +               } else {
 228                         printk(KERN_ERR "cpmac: no PHY present\n");
 229                         return -ENODEV;
 230                 }
 231 @@ -1063,32 +1093,8 @@
 232         priv->msg_enable = netif_msg_init(debug_level, 0xff);
 233         memcpy(dev->dev_addr, pdata->dev_addr, sizeof(dev->dev_addr));
 234
 235 -       if (phy_id == 31) {
 236 -               snprintf(priv->phy_name, BUS_ID_SIZE, PHY_ID_FMT, cpmac_mii.id,
 237 -                        phy_id);
 238 -       } else {
 239 -               /* Let's try to get a free fixed phy... */
 240 -               for (i = 0; i < MAX_PHY_AMNT; i++) {
 241 -                       fixed_phy = fixed_mdio_get_phydev(i);
 242 -                       if (!fixed_phy)
 243 -                               continue;
 244 -                       if (!fixed_phy->phydev->attached_dev) {
 245 -                               strncpy(priv->phy_name,
 246 -                                       fixed_phy->phydev->dev.bus_id,
 247 -                                       BUS_ID_SIZE);
 248 -                               fixed_mdio_set_link_update(fixed_phy->phydev,
 249 -                                                          &cpmac_link_update);
 250 -                               goto phy_found;
 251 -                       }
 252 -               }
 253 -               if (netif_msg_drv(priv))
 254 -                       printk(KERN_ERR "%s: Could not find fixed PHY\n",
 255 -                              dev->name);
 256 -               rc = -ENODEV;
 257 -               goto fail;
 258 -       }
 259 +       snprintf(priv->phy_name, BUS_ID_SIZE, PHY_ID_FMT, mdio_bus_id, phy_id);
 260
 261 -phy_found:
 262         priv->phy = phy_connect(dev, priv->phy_name, &cpmac_adjust_link, 0,
 263                                 PHY_INTERFACE_MODE_MII);
 264         if (IS_ERR(priv->phy)) {