target/linux/ar7-2.6/files/drivers/net/cpmac.c

   1 /*
   2  * $Id$
   3  *
   4  * Copyright (C) 2006, 2007 OpenWrt.org
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/moduleparam.h>
  24
  25 #include <linux/sched.h>
  26 #include <linux/kernel.h> /* printk() */
  27 #include <linux/slab.h>
  28 #include <linux/errno.h>
  29 #include <linux/types.h>
  30 #include <linux/delay.h>
  31 #include <linux/version.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/ethtool.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/mii.h>
  38 #include <linux/phy.h>
  39 #include <linux/platform_device.h>
  40 #include <asm/ar7/ar7.h>
  41 #include <asm/gpio.h>
  42
  43 MODULE_AUTHOR("Eugene Konev");
  44 MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)");
  45 MODULE_LICENSE("GPL");
  46
  47 /* Register definitions */
  48 struct cpmac_control_regs {
  49         volatile u32 revision;
  50         volatile u32 control;
  51         volatile u32 teardown;
  52         volatile u32 unused;
  53 };
  54
  55 struct cpmac_int_regs {
  56         volatile u32 stat_raw;
  57         volatile u32 stat_masked;
  58         volatile u32 enable;
  59         volatile u32 clear;
  60 };
  61
  62 struct cpmac_stats {
  63         volatile u32 good;
  64         volatile u32 bcast;
  65         volatile u32 mcast;
  66         volatile u32 pause;
  67         volatile u32 crc_error;
  68         volatile u32 align_error;
  69         volatile u32 oversized;
  70         volatile u32 jabber;
  71         volatile u32 undersized;
  72         volatile u32 fragment;
  73         volatile u32 filtered;
  74         volatile u32 qos_filtered;
  75         volatile u32 octets;
  76 };
  77
  78 struct cpmac_regs {
  79         struct cpmac_control_regs tx_ctrl;
  80         struct cpmac_control_regs rx_ctrl;
  81         volatile u32 unused1[56];
  82         volatile u32 mbp;
  83 /* MBP bits */
  84 #define MBP_RXPASSCRC         0x40000000
  85 #define MBP_RXQOS             0x20000000
  86 #define MBP_RXNOCHAIN         0x10000000
  87 #define MBP_RXCMF             0x01000000
  88 #define MBP_RXSHORT           0x00800000
  89 #define MBP_RXCEF             0x00400000
  90 #define MBP_RXPROMISC         0x00200000
  91 #define MBP_PROMISCCHAN(chan) (((chan) & 0x7) << 16)
  92 #define MBP_RXBCAST           0x00002000
  93 #define MBP_BCASTCHAN(chan)   (((chan) & 0x7) << 8)
  94 #define MBP_RXMCAST           0x00000020
  95 #define MBP_MCASTCHAN(chan)   ((chan) & 0x7)
  96         volatile u32 unicast_enable;
  97         volatile u32 unicast_clear;
  98         volatile u32 max_len;
  99         volatile u32 buffer_offset;
 100         volatile u32 filter_flow_threshold;
 101         volatile u32 unused2[2];
 102         volatile u32 flow_thre[8];
 103         volatile u32 free_buffer[8];
 104         volatile u32 mac_control;
 105 #define MAC_TXPTYPE  0x00000200
 106 #define MAC_TXPACE   0x00000040
 107 #define MAC_MII      0x00000020
 108 #define MAC_TXFLOW   0x00000010
 109 #define MAC_RXFLOW   0x00000008
 110 #define MAC_MTEST    0x00000004
 111 #define MAC_LOOPBACK 0x00000002
 112 #define MAC_FDX      0x00000001
 113         volatile u32 mac_status;
 114 #define MACST_QOS    0x4
 115 #define MACST_RXFLOW 0x2
 116 #define MACST_TXFLOW 0x1
 117         volatile u32 emc_control;
 118         volatile u32 unused3;
 119         struct cpmac_int_regs tx_int;
 120         volatile u32 mac_int_vector;
 121 /* Int Status bits */
 122 #define INTST_STATUS 0x80000
 123 #define INTST_HOST   0x40000
 124 #define INTST_RX     0x20000
 125 #define INTST_TX     0x10000
 126         volatile u32 mac_eoi_vector;
 127         volatile u32 unused4[2];
 128         struct cpmac_int_regs rx_int;
 129         volatile u32 mac_int_stat_raw;
 130         volatile u32 mac_int_stat_masked;
 131         volatile u32 mac_int_enable;
 132         volatile u32 mac_int_clear;
 133         volatile u32 mac_addr_low[8];
 134         volatile u32 mac_addr_mid;
 135         volatile u32 mac_addr_high;
 136         volatile u32 mac_hash_low;
 137         volatile u32 mac_hash_high;
 138         volatile u32 boff_test;
 139         volatile u32 pac_test;
 140         volatile u32 rx_pause;
 141         volatile u32 tx_pause;
 142         volatile u32 unused5[2];
 143         struct cpmac_stats rx_stats;
 144         struct cpmac_stats tx_stats;
 145         volatile u32 unused6[232];
 146         volatile u32 tx_ptr[8];
 147         volatile u32 rx_ptr[8];
 148         volatile u32 tx_ack[8];
 149         volatile u32 rx_ack[8];
 150
 151 };
 152
 153 struct cpmac_mdio_regs {
 154         volatile u32 version;
 155         volatile u32 control;
 156 #define MDIOC_IDLE        0x80000000
 157 #define MDIOC_ENABLE      0x40000000
 158 #define MDIOC_PREAMBLE    0x00100000
 159 #define MDIOC_FAULT       0x00080000
 160 #define MDIOC_FAULTDETECT 0x00040000
 161 #define MDIOC_INTTEST     0x00020000
 162 #define MDIOC_CLKDIV(div) ((div) & 0xff)
 163         volatile u32 alive;
 164         volatile u32 link;
 165         struct cpmac_int_regs link_int;
 166         struct cpmac_int_regs user_int;
 167         u32 unused[20];
 168         volatile u32 access;
 169 #define MDIO_BUSY       0x80000000
 170 #define MDIO_WRITE      0x40000000
 171 #define MDIO_REG(reg)   (((reg) & 0x1f) << 21)
 172 #define MDIO_PHY(phy)   (((phy) & 0x1f) << 16)
 173 #define MDIO_DATA(data) ((data) & 0xffff)
 174         volatile u32 physel;
 175 };
 176
 177 /* Descriptor */
 178 struct cpmac_desc {
 179         u32 hw_next;
 180         u32 hw_data;
 181         u16 buflen;
 182         u16 bufflags;
 183         u16 datalen;
 184         u16 dataflags;
 185 /* Flags bits */
 186 #define CPMAC_SOP 0x8000
 187 #define CPMAC_EOP 0x4000
 188 #define CPMAC_OWN 0x2000
 189 #define CPMAC_EOQ 0x1000
 190         u32 jiffies;
 191         struct sk_buff *skb;
 192         struct cpmac_desc *next;
 193 };
 194
 195 struct cpmac_priv {
 196         struct net_device_stats stats;
 197         spinlock_t lock;
 198         struct sk_buff *skb_pool;
 199         int free_skbs;
 200         struct cpmac_desc *rx_head, *rx_tail;
 201         int tx_head, tx_tail;
 202         struct cpmac_desc *desc_ring;
 203         struct cpmac_regs *regs;
 204         struct mii_bus *mii_bus;
 205         struct phy_device *phy;
 206         char phy_name[BUS_ID_SIZE];
 207         struct plat_cpmac_data *config;
 208         int oldlink, oldspeed, oldduplex;
 209         u32 msg_enable;
 210         struct net_device *dev;
 211         struct work_struct alloc_work;
 212         struct work_struct reset_work;
 213 };
 214
 215 static irqreturn_t cpmac_irq(int, void *);
 216 static int cpmac_stop(struct net_device *dev);
 217 static int cpmac_open(struct net_device *dev);
 218
 219 #define CPMAC_LOW_THRESH 8
 220 #define CPMAC_ALLOC_SIZE 32
 221 #define CPMAC_SKB_SIZE 1536
 222 #define CPMAC_TX_RING_SIZE 8
 223 #define CPMAC_RX_RING_SIZE 16
 224
 225 #ifdef CPMAC_DEBUG
 226 static void cpmac_dump_regs(u32 *base, int count)
 227 {
 228         int i;
 229         for (i = 0; i < (count + 3) / 4; i++) {
 230                 if (i % 4 == 0) printk("\nCPMAC[0x%04x]:", i * 4);
 231                 printk(" 0x%08x", *(base + i));
 232         }
 233         printk("\n");
 234 }
 235 #endif
 236
 237 static int cpmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
 238 {
 239         struct cpmac_mdio_regs *regs = (struct cpmac_mdio_regs *)bus->priv;
 240         volatile u32 val;
 241
 242         while ((val = regs->access) & MDIO_BUSY);
 243         regs->access = MDIO_BUSY | MDIO_REG(regnum & 0x1f) |
 244                 MDIO_PHY(phy_id & 0x1f);
 245         while ((val = regs->access) & MDIO_BUSY);
 246
 247         return val & 0xffff;
 248 }
 249
 250 static int cpmac_mdio_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
 251 {
 252         struct cpmac_mdio_regs *regs = (struct cpmac_mdio_regs *)bus->priv;
 253         volatile u32 tmp;
 254
 255         while ((tmp = regs->access) & MDIO_BUSY);
 256         regs->access = MDIO_BUSY | MDIO_WRITE |
 257                 MDIO_REG(regnum & 0x1f) | MDIO_PHY(phy_id & 0x1f) |
 258                 val;
 259
 260         return 0;
 261 }
 262
 263 static int cpmac_mdio_reset(struct mii_bus *bus)
 264 {
 265         struct cpmac_mdio_regs *regs = (struct cpmac_mdio_regs *)bus->priv;
 266
 267         ar7_device_reset(AR7_RESET_BIT_MDIO);
 268         regs->control = MDIOC_ENABLE |
 269                 MDIOC_CLKDIV(ar7_cpmac_freq() / 2200000 - 1);
 270
 271         return 0;
 272 }
 273
 274 static int mii_irqs[PHY_MAX_ADDR] = { PHY_POLL, };
 275
 276 static struct mii_bus cpmac_mii = {
 277         .name = "cpmac-mii",
 278         .read = cpmac_mdio_read,
 279         .write = cpmac_mdio_write,
 280         .reset = cpmac_mdio_reset,
 281         .irq = mii_irqs,
 282 };
 283
 284 static int cpmac_config(struct net_device *dev, struct ifmap *map)
 285 {
 286         if (dev->flags & IFF_UP)
 287                 return -EBUSY;
 288
 289         /* Don't allow changing the I/O address */
 290         if (map->base_addr != dev->base_addr)
 291                 return -EOPNOTSUPP;
 292
 293         /* ignore other fields */
 294         return 0;
 295 }
 296
 297 static int cpmac_set_mac_address(struct net_device *dev, void *addr)
 298 {
 299         struct sockaddr *sa = addr;
 300
 301         if (dev->flags & IFF_UP)
 302                 return -EBUSY;
 303
 304         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 305
 306         return 0;
 307 }
 308
 309 static void cpmac_set_multicast_list(struct net_device *dev)
 310 {
 311         struct dev_mc_list *iter;
 312         int i;
 313         int hash, tmp;
 314         int hashlo = 0, hashhi = 0;
 315         struct cpmac_priv *priv = netdev_priv(dev);
 316
 317         if(dev->flags & IFF_PROMISC) {
 318                 priv->regs->mbp &= ~MBP_PROMISCCHAN(0); /* promisc channel 0 */
 319                 priv->regs->mbp |= MBP_RXPROMISC;
 320         } else {
 321                 priv->regs->mbp &= ~MBP_RXPROMISC;
 322                 if(dev->flags & IFF_ALLMULTI) {
 323                         /* enable all multicast mode */
 324                         priv->regs->mac_hash_low = 0xffffffff;
 325                         priv->regs->mac_hash_high = 0xffffffff;
 326                 } else {
 327                         for(i = 0, iter = dev->mc_list; i < dev->mc_count;
 328                             i++, iter = iter->next) {
 329                                 hash = 0;
 330                                 tmp = iter->dmi_addr[0];
 331                                 hash  ^= (tmp >> 2) ^ (tmp << 4);
 332                                 tmp = iter->dmi_addr[1];
 333                                 hash  ^= (tmp >> 4) ^ (tmp << 2);
 334                                 tmp = iter->dmi_addr[2];
 335                                 hash  ^= (tmp >> 6) ^ tmp;
 336                                 tmp = iter->dmi_addr[4];
 337                                 hash  ^= (tmp >> 2) ^ (tmp << 4);
 338                                 tmp = iter->dmi_addr[5];
 339                                 hash  ^= (tmp >> 4) ^ (tmp << 2);
 340                                 tmp = iter->dmi_addr[6];
 341                                 hash  ^= (tmp >> 6) ^ tmp;
 342                                 hash &= 0x3f;
 343                                 if(hash < 32) {
 344                                         hashlo |= 1<<hash;
 345                                 } else {
 346                                         hashhi |= 1<<(hash - 32);
 347                                 }
 348                         }
 349
 350                         priv->regs->mac_hash_low = hashlo;
 351                         priv->regs->mac_hash_high = hashhi;
 352                 }
 353         }
 354 }
 355
 356 static struct sk_buff *cpmac_get_skb(struct net_device *dev)
 357 {
 358         struct sk_buff *skb;
 359         struct cpmac_priv *priv = netdev_priv(dev);
 360
 361         skb = priv->skb_pool;
 362         if (likely(skb))
 363                 priv->skb_pool = skb->next;
 364
 365         if (likely(priv->free_skbs))
 366                 priv->free_skbs--;
 367
 368         if (priv->free_skbs < CPMAC_LOW_THRESH)
 369                 schedule_work(&priv->alloc_work);
 370
 371         return skb;
 372 }
 373
 374 static void cpmac_rx(struct net_device *dev, int channel)
 375 {
 376         char *data;
 377         struct sk_buff *skb;
 378         struct cpmac_desc *desc;
 379         struct cpmac_desc *start;
 380         struct cpmac_priv *priv = netdev_priv(dev);
 381
 382         spin_lock(&priv->lock);
 383         if (unlikely(!priv->rx_head))
 384                 return;
 385
 386
 387         desc = priv->rx_tail->next;
 388         dma_cache_inv((u32)desc, 16);
 389
 390         start = priv->rx_tail;
 391         while((desc->dataflags & CPMAC_OWN) == 0) {
 392                 priv->regs->rx_ack[0] = virt_to_phys(desc);
 393                 if (unlikely(!desc->datalen)) {
 394                         if (printk_ratelimit())
 395                                 printk(KERN_NOTICE "%s: rx: spurious interrupt\n",
 396                                        dev->name);
 397                         priv->stats.rx_errors++;
 398                         goto out;
 399                 }
 400
 401                 skb = cpmac_get_skb(dev);
 402                 if (likely(skb)) {
 403                         data = (char *)phys_to_virt(desc->hw_data);
 404                         dma_cache_inv((u32)data, desc->datalen);
 405                         skb_put(desc->skb, desc->datalen);
 406                         desc->skb->protocol = eth_type_trans(desc->skb, dev);
 407                         desc->skb->ip_summed = CHECKSUM_NONE;
 408                         priv->stats.rx_packets++;
 409                         priv->stats.rx_bytes += desc->datalen;
 410                         netif_rx(desc->skb);
 411                         desc->skb = skb;
 412                 } else {
 413                         if (printk_ratelimit())
 414                                 printk(KERN_NOTICE "%s: rx: no free skbs, dropping packet\n",
 415                                        dev->name);
 416                         priv->regs->rx_ptr[0] = virt_to_phys(desc);
 417                         priv->stats.rx_dropped++;
 418                 }
 419                 desc->hw_data = virt_to_phys(desc->skb->data);
 420                 desc->buflen = CPMAC_SKB_SIZE;
 421                 desc->dataflags = CPMAC_OWN;
 422                 desc->hw_next = 0;
 423                 dma_cache_wback((u32)desc, 16);
 424
 425                 priv->rx_tail->hw_next = virt_to_phys(desc);
 426                 priv->rx_tail->dataflags = CPMAC_OWN;
 427                 dma_cache_wback((u32)priv->rx_tail, 16);
 428
 429                 priv->rx_tail = desc;
 430                 desc = desc->next;
 431                 dma_cache_inv((u32)desc, 16);
 432                 if (start == desc) {
 433                         break;
 434                 }
 435         }
 436 out:
 437         priv->rx_head = desc;
 438         priv->regs->rx_ptr[0] = virt_to_phys(desc);
 439         spin_unlock(&priv->lock);
 440 }
 441
 442 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 443 static void
 444 cpmac_alloc_skbs(struct work_struct *work)
 445 {
 446         struct cpmac_priv *priv = container_of(work, struct cpmac_priv,
 447                                                alloc_work);
 448 #else
 449 static void
 450 cpmac_alloc_skbs(void *data)
 451 {
 452         struct net_device *dev = (struct net_device*)data;
 453         struct cpmac_priv *priv = netdev_priv(dev);
 454 #endif
 455         unsigned long flags;
 456         int i, num_skbs = 0;
 457         struct sk_buff *skb, *skbs = NULL;
 458
 459         for (i = 0; i < CPMAC_ALLOC_SIZE; i++) {
 460                 skb = alloc_skb(CPMAC_SKB_SIZE + 2, GFP_KERNEL);
 461                 if (!skb)
 462                         break;
 463                 skb->next = skbs;
 464                 skb_reserve(skb, 2);
 465                 skb->dev = priv->dev;
 466                 num_skbs++;
 467                 skbs = skb;
 468         }
 469
 470         if (skbs) {
 471                 spin_lock_irqsave(&priv->lock, flags);
 472                 for (skb = priv->skb_pool; skb && skb->next; skb = skb->next);
 473                 if (!skb) {
 474                         priv->skb_pool = skbs;
 475                 } else {
 476                         skb->next = skbs;
 477                 }
 478                 priv->free_skbs += num_skbs;
 479                 spin_unlock_irqrestore(&priv->lock, flags);
 480 #ifdef CPMAC_DEBUG
 481                 printk("%s: allocated %d skbs\n", priv->dev->name, num_skbs);
 482 #endif
 483         }
 484 }
 485
 486 static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
 487 {
 488         unsigned long flags;
 489         int len, chan;
 490         struct cpmac_desc *desc;
 491         struct cpmac_priv *priv = netdev_priv(dev);
 492
 493         len = skb->len;
 494         if (unlikely(len < ETH_ZLEN)) {
 495                 if (unlikely(skb_padto(skb, ETH_ZLEN))) {
 496                         if (printk_ratelimit())
 497                                 printk(KERN_NOTICE "%s: padding failed, dropping\n",
 498                                        dev->name);
 499                         spin_lock_irqsave(&priv->lock, flags);
 500                         priv->stats.tx_dropped++;
 501                         spin_unlock_irqrestore(&priv->lock, flags);
 502                         return -ENOMEM;
 503                 }
 504                 len = ETH_ZLEN;
 505         }
 506         spin_lock_irqsave(&priv->lock, flags);
 507         chan = priv->tx_tail++;
 508         priv->tx_tail %= 8;
 509         if (priv->tx_tail == priv->tx_head)
 510                 netif_stop_queue(dev);
 511
 512         desc = &priv->desc_ring[chan];
 513         dma_cache_inv((u32)desc, 16);
 514         if (desc->dataflags & CPMAC_OWN) {
 515                 printk(KERN_NOTICE "%s: tx dma ring full, dropping\n", dev->name);
 516                 spin_lock_irqsave(&priv->lock, flags);
 517                 priv->stats.tx_dropped++;
 518                 spin_unlock_irqrestore(&priv->lock, flags);
 519                 return -ENOMEM;
 520         }
 521
 522         dev->trans_start = jiffies;
 523         desc->jiffies = dev->trans_start;
 524         spin_unlock_irqrestore(&priv->lock, flags);
 525
 526         desc->dataflags = CPMAC_SOP | CPMAC_EOP | CPMAC_OWN;
 527         desc->skb = skb;
 528         desc->hw_data = virt_to_phys(skb->data);
 529         dma_cache_wback((u32)skb->data, len);
 530         desc->buflen = len;
 531         desc->datalen = len;
 532         desc->hw_next = 0;
 533         dma_cache_wback((u32)desc, 16);
 534         priv->regs->tx_ptr[chan] = virt_to_phys(desc);
 535         return 0;
 536 }
 537
 538 static void cpmac_end_xmit(struct net_device *dev, int channel)
 539 {
 540         struct cpmac_desc *desc;
 541         struct cpmac_priv *priv = netdev_priv(dev);
 542
 543         spin_lock(&priv->lock);
 544         desc = &priv->desc_ring[channel];
 545         priv->regs->tx_ack[channel] = virt_to_phys(desc);
 546         if (likely(desc->skb)) {
 547                 priv->stats.tx_packets++;
 548                 priv->stats.tx_bytes += desc->skb->len;
 549                 dev_kfree_skb_irq(desc->skb);
 550                 if (priv->tx_head == channel) {
 551                         while ((desc->dataflags & CPMAC_OWN) == 0) {
 552                                 priv->tx_head++;
 553                                 priv->tx_head %= 8;
 554                                 if (priv->tx_head == priv->tx_tail)
 555                                         break;
 556                                 desc = &priv->desc_ring[priv->tx_head];
 557                         }
 558                 }
 559                 if (netif_queue_stopped(dev))
 560                         netif_wake_queue(dev);
 561         } else {
 562                 if (printk_ratelimit())
 563                         printk(KERN_NOTICE "%s: end_xmit: spurious interrupt\n",
 564                                dev->name);
 565         }
 566         spin_unlock(&priv->lock);
 567 }
 568
 569 static void cpmac_reset(struct net_device *dev)
 570 {
 571         int i;
 572         struct cpmac_priv *priv = netdev_priv(dev);
 573
 574         ar7_device_reset(priv->config->reset_bit);
 575         priv->regs->rx_ctrl.control &= ~1;
 576         priv->regs->tx_ctrl.control &= ~1;
 577         for (i = 0; i < 8; i++) {
 578                 priv->regs->tx_ptr[i] = 0;
 579                 priv->regs->rx_ptr[i] = 0;
 580         }
 581         priv->regs->mac_control &= ~MAC_MII; /* disable mii */
 582 }
 583
 584 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 585 static void
 586 cpmac_full_reset(struct work_struct *work)
 587 {
 588         struct cpmac_priv *priv = container_of(work, struct cpmac_priv,
 589                                                alloc_work);
 590         struct net_device *dev = priv->dev;
 591 #else
 592 static void
 593 cpmac_full_reset(void *data)
 594 {
 595         struct net_device *dev = (struct net_device*)data;
 596 #endif
 597
 598         cpmac_stop(dev);
 599         cpmac_open(dev);
 600 }
 601
 602
 603 static irqreturn_t cpmac_irq(int irq, void *dev_id)
 604 {
 605         struct net_device *dev = (struct net_device *)dev_id;
 606         struct cpmac_priv *priv = netdev_priv(dev);
 607         u32 status;
 608
 609         if (!dev)
 610                 return IRQ_NONE;
 611
 612         status = priv->regs->mac_int_vector;
 613
 614         if (status & INTST_TX) {
 615                 cpmac_end_xmit(dev, (status & 7));
 616         }
 617
 618         if (status & INTST_RX) {
 619                 cpmac_rx(dev, (status >> 8) & 7);
 620         }
 621
 622         if (unlikely(status & INTST_HOST)) { /* host interrupt ??? */
 623                 printk("%s: host int, something bad happened - mac status: 0x%08x\n", dev->name, priv->regs->mac_status);
 624
 625                 /* try to recover */
 626                 cpmac_reset(dev);
 627                 schedule_work(&priv->reset_work);
 628         }
 629
 630         if (unlikely(status & INTST_STATUS)) { /* status interrupt ??? */
 631                 printk("%s: status int, what are we gonna do?\n", dev->name);
 632         }
 633
 634         priv->regs->mac_eoi_vector = 0;
 635
 636         return IRQ_HANDLED;
 637 }
 638
 639 static void cpmac_tx_timeout(struct net_device *dev)
 640 {
 641         struct cpmac_priv *priv = netdev_priv(dev);
 642         struct cpmac_desc *desc;
 643
 644         priv->stats.tx_errors++;
 645         desc = &priv->desc_ring[priv->tx_head++];
 646         priv->tx_head %= 8;
 647         printk("Transmit timeout at %ld, latency %ld\n", jiffies,
 648                jiffies - desc->jiffies);
 649         if (desc->skb)
 650                 dev_kfree_skb(desc->skb);
 651         netif_wake_queue(dev);
 652 }
 653
 654 static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 655 {
 656         struct cpmac_priv *priv = netdev_priv(dev);
 657         if (!(netif_running(dev)))
 658                 return -EINVAL;
 659         if (!priv->phy)
 660                 return -EINVAL;
 661         return phy_mii_ioctl(priv->phy, if_mii(ifr), cmd);
 662 }
 663
 664 static int cpmac_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 665 {
 666         struct cpmac_priv *priv = netdev_priv(dev);
 667
 668         if (priv->phy)
 669                 return phy_ethtool_gset(priv->phy, cmd);
 670
 671         return -EINVAL;
 672 }
 673
 674 static int cpmac_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 675 {
 676         struct cpmac_priv *priv = netdev_priv(dev);
 677
 678         if (!capable(CAP_NET_ADMIN))
 679                 return -EPERM;
 680
 681         if (priv->phy)
 682                 return phy_ethtool_sset(priv->phy, cmd);
 683
 684         return -EINVAL;
 685 }
 686
 687 static void cpmac_get_drvinfo(struct net_device *dev,
 688                               struct ethtool_drvinfo *info)
 689 {
 690         strcpy(info->driver, "cpmac");
 691         strcpy(info->version, "0.0.3");
 692         info->fw_version[0] = '\0';
 693         sprintf(info->bus_info, "%s", "cpmac");
 694         info->regdump_len = 0;
 695 }
 696
 697 static const struct ethtool_ops cpmac_ethtool_ops = {
 698         .get_settings = cpmac_get_settings,
 699         .set_settings = cpmac_set_settings,
 700         .get_drvinfo = cpmac_get_drvinfo,
 701         .get_link = ethtool_op_get_link,
 702 };
 703
 704 static struct net_device_stats *cpmac_stats(struct net_device *dev)
 705 {
 706         struct cpmac_priv *priv = netdev_priv(dev);
 707
 708         if (netif_device_present(dev))
 709                 return &priv->stats;
 710
 711         return NULL;
 712 }
 713
 714 static int cpmac_change_mtu(struct net_device *dev, int mtu)
 715 {
 716         unsigned long flags;
 717         struct cpmac_priv *priv = netdev_priv(dev);
 718         spinlock_t *lock = &priv->lock;
 719
 720         if ((mtu < 68) || (mtu > 1500))
 721                 return -EINVAL;
 722
 723         spin_lock_irqsave(lock, flags);
 724         dev->mtu = mtu;
 725         spin_unlock_irqrestore(lock, flags);
 726
 727         return 0;
 728 }
 729
 730 static void cpmac_adjust_link(struct net_device *dev)
 731 {
 732         struct cpmac_priv *priv = netdev_priv(dev);
 733         unsigned long flags;
 734         int new_state = 0;
 735
 736         spin_lock_irqsave(&priv->lock, flags);
 737         if (priv->phy->link) {
 738                 if (priv->phy->duplex != priv->oldduplex) {
 739                         new_state = 1;
 740                         priv->oldduplex = priv->phy->duplex;
 741                 }
 742
 743                 if (priv->phy->speed != priv->oldspeed) {
 744                         new_state = 1;
 745                         priv->oldspeed = priv->phy->speed;
 746                 }
 747
 748                 if (!priv->oldlink) {
 749                         new_state = 1;
 750                         priv->oldlink = 1;
 751                         netif_schedule(dev);
 752                 }
 753         } else if (priv->oldlink) {
 754                 new_state = 1;
 755                 priv->oldlink = 0;
 756                 priv->oldspeed = 0;
 757                 priv->oldduplex = -1;
 758         }
 759
 760         if (new_state)
 761                 phy_print_status(priv->phy);
 762
 763         spin_unlock_irqrestore(&priv->lock, flags);
 764 }
 765
 766 static int cpmac_open(struct net_device *dev)
 767 {
 768         int i, size, res;
 769         struct cpmac_priv *priv = netdev_priv(dev);
 770         struct cpmac_desc *desc;
 771         struct sk_buff *skb;
 772
 773 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 774         priv->phy = phy_connect(dev, priv->phy_name, &cpmac_adjust_link,
 775                                 0, PHY_INTERFACE_MODE_MII);
 776 #else
 777         priv->phy = phy_connect(dev, priv->phy_name, &cpmac_adjust_link, 0);
 778 #endif
 779         if (IS_ERR(priv->phy)) {
 780                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 781                 return PTR_ERR(priv->phy);
 782         }
 783
 784         if (!request_mem_region(dev->mem_start, dev->mem_end -
 785                                 dev->mem_start, dev->name)) {
 786                 printk("%s: failed to request registers\n",
 787                        dev->name);
 788                 res = -ENXIO;
 789                 goto fail_reserve;
 790         }
 791
 792         priv->regs = ioremap_nocache(dev->mem_start, dev->mem_end -
 793                                      dev->mem_start);
 794         if (!priv->regs) {
 795                 printk("%s: failed to remap registers\n", dev->name);
 796                 res = -ENXIO;
 797                 goto fail_remap;
 798         }
 799
 800         priv->rx_head = NULL;
 801         size = sizeof(struct cpmac_desc) * (CPMAC_RX_RING_SIZE +
 802                                             CPMAC_TX_RING_SIZE);
 803         priv->desc_ring = (struct cpmac_desc *)kmalloc(size, GFP_KERNEL);
 804         if (!priv->desc_ring) {
 805                 res = -ENOMEM;
 806                 goto fail_alloc;
 807         }
 808
 809         memset((char *)priv->desc_ring, 0, size);
 810
 811         priv->skb_pool = NULL;
 812         priv->free_skbs = 0;
 813         priv->rx_head = &priv->desc_ring[CPMAC_TX_RING_SIZE];
 814
 815 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 816         INIT_WORK(&priv->alloc_work, cpmac_alloc_skbs);
 817         INIT_WORK(&priv->reset_work, cpmac_full_reset);
 818 #else
 819         INIT_WORK(&priv->alloc_work, cpmac_alloc_skbs, dev);
 820         INIT_WORK(&priv->reset_work, cpmac_full_reset, dev);
 821 #endif
 822         schedule_work(&priv->alloc_work);
 823         flush_scheduled_work();
 824
 825         for (i = 0; i < CPMAC_RX_RING_SIZE; i++) {
 826                 desc = &priv->rx_head[i];
 827                 skb = cpmac_get_skb(dev);
 828                 if (!skb) {
 829                         res = -ENOMEM;
 830                         goto fail_desc;
 831                 }
 832                 desc->skb = skb;
 833                 desc->hw_data = virt_to_phys(skb->data);
 834                 desc->buflen = CPMAC_SKB_SIZE;
 835                 desc->dataflags = CPMAC_OWN;
 836                 desc->next = &priv->rx_head[i + 1];
 837                 desc->hw_next = virt_to_phys(desc->next);
 838                 dma_cache_wback((u32)desc, 16);
 839         }
 840         priv->rx_tail = &priv->rx_head[CPMAC_RX_RING_SIZE - 1];
 841         priv->rx_tail->next = priv->rx_head;
 842         priv->rx_tail->hw_next = 0;
 843
 844         cpmac_reset(dev);
 845         for (i = 0; i < 8; i++)
 846                 priv->regs->tx_ptr[i] = 0;
 847         priv->regs->rx_ptr[0] = virt_to_phys(priv->rx_head);
 848
 849         priv->regs->mbp = MBP_RXSHORT | MBP_RXBCAST | MBP_RXMCAST;
 850         priv->regs->unicast_enable = 0x1;
 851         priv->regs->unicast_clear = 0xfe;
 852         priv->regs->buffer_offset = 0;
 853         for (i = 0; i < 8; i++)
 854                 priv->regs->mac_addr_low[i] = dev->dev_addr[5];
 855         priv->regs->mac_addr_mid = dev->dev_addr[4];
 856         priv->regs->mac_addr_high = dev->dev_addr[0] | (dev->dev_addr[1] << 8)
 857                 | (dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
 858         priv->regs->max_len = CPMAC_SKB_SIZE;
 859         priv->regs->rx_int.enable = 0x1;
 860         priv->regs->rx_int.clear = 0xfe;
 861         priv->regs->tx_int.enable = 0xff;
 862         priv->regs->tx_int.clear = 0;
 863         priv->regs->mac_int_enable = 3;
 864         priv->regs->mac_int_clear = 0xfc;
 865
 866         if((res = request_irq(dev->irq, cpmac_irq, SA_INTERRUPT,
 867                               dev->name, dev))) {
 868                 printk("%s: failed to obtain irq\n", dev->name);
 869                 goto fail_irq;
 870         }
 871
 872         priv->regs->rx_ctrl.control |= 1;
 873         priv->regs->tx_ctrl.control |= 1;
 874         priv->regs->mac_control |= MAC_MII | MAC_FDX;
 875
 876         priv->phy->state = PHY_CHANGELINK;
 877         phy_start(priv->phy);
 878
 879         netif_start_queue(dev);
 880         return 0;
 881
 882 fail_irq:
 883 fail_desc:
 884         for (i = 0; i < CPMAC_RX_RING_SIZE; i++)
 885                 if (priv->rx_head[i].skb)
 886                         kfree_skb(priv->rx_head[i].skb);
 887 fail_alloc:
 888         kfree(priv->desc_ring);
 889
 890         for (skb = priv->skb_pool; skb; skb = priv->skb_pool) {
 891                 priv->skb_pool = skb->next;
 892                 kfree_skb(skb);
 893         }
 894
 895         iounmap(priv->regs);
 896
 897 fail_remap:
 898         release_mem_region(dev->mem_start, dev->mem_end -
 899                            dev->mem_start);
 900
 901 fail_reserve:
 902         phy_disconnect(priv->phy);
 903
 904         return res;
 905 }
 906
 907 static int cpmac_stop(struct net_device *dev)
 908 {
 909         int i;
 910         struct sk_buff *skb;
 911         struct cpmac_priv *priv = netdev_priv(dev);
 912
 913         netif_stop_queue(dev);
 914
 915         phy_stop(priv->phy);
 916         phy_disconnect(priv->phy);
 917         priv->phy = NULL;
 918
 919         cpmac_reset(dev);
 920
 921         for (i = 0; i < 8; i++) {
 922                 priv->regs->rx_ptr[i] = 0;
 923                 priv->regs->tx_ptr[i] = 0;
 924                 priv->regs->mbp = 0;
 925         }
 926
 927         free_irq(dev->irq, dev);
 928         release_mem_region(dev->mem_start, dev->mem_end -
 929                            dev->mem_start);
 930
 931         cancel_delayed_work(&priv->alloc_work);
 932         flush_scheduled_work();
 933
 934         priv->rx_head = &priv->desc_ring[CPMAC_TX_RING_SIZE];
 935         for (i = 0; i < CPMAC_RX_RING_SIZE; i++)
 936                 if (priv->rx_head[i].skb)
 937                         kfree_skb(priv->rx_head[i].skb);
 938
 939         kfree(priv->desc_ring);
 940
 941         for (skb = priv->skb_pool; skb; skb = priv->skb_pool) {
 942                 priv->skb_pool = skb->next;
 943                 kfree_skb(skb);
 944         }
 945
 946         return 0;
 947 }
 948
 949 static int external_switch = 0;
 950
 951 static int __devinit cpmac_probe(struct platform_device *pdev)
 952 {
 953         int i, rc, phy_id;
 954         struct resource *res;
 955         struct cpmac_priv *priv;
 956         struct net_device *dev;
 957         struct plat_cpmac_data *pdata;
 958
 959         if (strcmp(pdev->name, "cpmac") != 0)
 960                 return -ENODEV;
 961
 962         pdata = pdev->dev.platform_data;
 963
 964         for (phy_id = 0; phy_id < PHY_MAX_ADDR; phy_id++) {
 965                 if (!(pdata->phy_mask & (1 << phy_id)))
 966                         continue;
 967                 if (!cpmac_mii.phy_map[phy_id])
 968                         continue;
 969                 break;
 970         }
 971
 972         if (phy_id == PHY_MAX_ADDR) {
 973                 if (external_switch) {
 974                         phy_id = 0;
 975                 } else {
 976                         printk("cpmac: no PHY present\n");
 977                         return -ENODEV;
 978                 }
 979         }
 980
 981         dev = alloc_etherdev(sizeof(struct cpmac_priv));
 982
 983         if (!dev) {
 984                 printk(KERN_ERR "cpmac: Unable to allocate net_device structure!\n");
 985                 return -ENOMEM;
 986         }
 987
 988         SET_MODULE_OWNER(dev);
 989         platform_set_drvdata(pdev, dev);
 990         priv = netdev_priv(dev);
 991
 992         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 993         if (!res) {
 994                 rc = -ENODEV;
 995                 goto fail;
 996         }
 997
 998         dev->mem_start = res->start;
 999         dev->mem_end = res->end;
1000         dev->irq = platform_get_irq_byname(pdev, "irq");
1001
1002         dev->mtu                = 1500;
1003         dev->open               = cpmac_open;
1004         dev->stop               = cpmac_stop;
1005         dev->set_config         = cpmac_config;
1006         dev->hard_start_xmit    = cpmac_start_xmit;
1007         dev->do_ioctl           = cpmac_ioctl;
1008         dev->get_stats          = cpmac_stats;
1009         dev->change_mtu         = cpmac_change_mtu;
1010         dev->set_mac_address    = cpmac_set_mac_address;
1011         dev->set_multicast_list = cpmac_set_multicast_list;
1012         dev->tx_timeout         = cpmac_tx_timeout;
1013         dev->ethtool_ops        = &cpmac_ethtool_ops;
1014
1015         memset(priv, 0, sizeof(struct cpmac_priv));
1016         spin_lock_init(&priv->lock);
1017         priv->msg_enable = netif_msg_init(NETIF_MSG_WOL, 0x3fff);
1018         priv->config = pdata;
1019         priv->dev = dev;
1020         memcpy(dev->dev_addr, priv->config->dev_addr, sizeof(dev->dev_addr));
1021         if (phy_id == 31) {
1022                 snprintf(priv->phy_name, BUS_ID_SIZE, PHY_ID_FMT,
1023                          cpmac_mii.id, phy_id);
1024         } else {
1025                 snprintf(priv->phy_name, BUS_ID_SIZE, "fixed@%d:%d", 100, 1);
1026         }
1027
1028         if ((rc = register_netdev(dev))) {
1029                 printk("cpmac: error %i registering device %s\n",
1030                        rc, dev->name);
1031                 goto fail;
1032         }
1033
1034         printk("cpmac: device %s (regs: %p, irq: %d, phy: %s, mac: ",
1035                dev->name, (u32 *)dev->mem_start, dev->irq,
1036                priv->phy_name);
1037         for (i = 0; i < 6; i++) {
1038                 printk("%02x", dev->dev_addr[i]);
1039                 if (i < 5) printk(":");
1040                 else printk(")\n");
1041         }
1042
1043         return 0;
1044
1045 fail:
1046         free_netdev(dev);
1047         return rc;
1048 }
1049
1050 static int __devexit cpmac_remove(struct platform_device *pdev)
1051 {
1052         struct net_device *dev = platform_get_drvdata(pdev);
1053         unregister_netdev(dev);
1054         free_netdev(dev);
1055         return 0;
1056 }
1057
1058 static struct platform_driver cpmac_driver = {
1059         .driver.name = "cpmac",
1060         .probe = cpmac_probe,
1061         .remove = cpmac_remove,
1062 };
1063
1064 int __devinit cpmac_init(void)
1065 {
1066         volatile u32 mask;
1067         int i, res;
1068         cpmac_mii.priv = (struct cpmac_mdio_regs *)
1069                 ioremap_nocache(AR7_REGS_MDIO, sizeof(struct cpmac_mdio_regs));
1070
1071         if (!cpmac_mii.priv) {
1072                 printk("Can't ioremap mdio registers\n");
1073                 return -ENXIO;
1074         }
1075
1076 #warning FIXME: unhardcode gpio&reset bits
1077         ar7_gpio_disable(26);
1078         ar7_gpio_disable(27);
1079         ar7_device_reset(17);
1080         ar7_device_reset(21);
1081         ar7_device_reset(26);
1082
1083         cpmac_mii.reset(&cpmac_mii);
1084
1085         for (i = 0; i < 300000; i++) {
1086                 mask = ((struct cpmac_mdio_regs *)cpmac_mii.priv)->alive;
1087                 if (mask)
1088                         break;
1089         }
1090
1091         mask &= 0x7fffffff;
1092         if (mask & (mask - 1)) {
1093                 external_switch = 1;
1094                 mask = 0;
1095         }
1096
1097         cpmac_mii.phy_mask = ~(mask | 0x80000000);
1098
1099         res = mdiobus_register(&cpmac_mii);
1100         if (res)
1101                 goto fail_mii;
1102
1103         res = platform_driver_register(&cpmac_driver);
1104         if (res)
1105                 goto fail_cpmac;
1106
1107         return 0;
1108
1109 fail_cpmac:
1110         mdiobus_unregister(&cpmac_mii);
1111
1112 fail_mii:
1113         iounmap(cpmac_mii.priv);
1114
1115         return res;
1116 }
1117
1118 void __devexit cpmac_exit(void)
1119 {
1120         platform_driver_unregister(&cpmac_driver);
1121         mdiobus_unregister(&cpmac_mii);
1122 }
1123
1124 module_init(cpmac_init);
1125 module_exit(cpmac_exit);