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                         printk("Somebody set up us the bomb!!\n");
 434                         break;
 435                 }
 436         }
 437 out:
 438         priv->rx_head = desc;
 439         priv->regs->rx_ptr[0] = virt_to_phys(desc);
 440         spin_unlock(&priv->lock);
 441 }
 442
 443 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 444 static void
 445 cpmac_alloc_skbs(struct work_struct *work)
 446 {
 447         struct cpmac_priv *priv = container_of(work, struct cpmac_priv,
 448                                                alloc_work);
 449 #else
 450 static void
 451 cpmac_alloc_skbs(void *data)
 452 {
 453         struct net_device *dev = (struct net_device*)data;
 454         struct cpmac_priv *priv = netdev_priv(dev);
 455 #endif
 456         unsigned long flags;
 457         int i, num_skbs = 0;
 458         struct sk_buff *skb, *skbs = NULL;
 459
 460         for (i = 0; i < CPMAC_ALLOC_SIZE; i++) {
 461                 skb = alloc_skb(CPMAC_SKB_SIZE + 2, GFP_KERNEL);
 462                 if (!skb)
 463                         break;
 464                 skb->next = skbs;
 465                 skb_reserve(skb, 2);
 466                 skb->dev = priv->dev;
 467                 num_skbs++;
 468                 skbs = skb;
 469         }
 470
 471         if (skbs) {
 472                 spin_lock_irqsave(&priv->lock, flags);
 473                 for (skb = priv->skb_pool; skb && skb->next; skb = skb->next);
 474                 if (!skb) {
 475                         priv->skb_pool = skbs;
 476                 } else {
 477                         skb->next = skbs;
 478                 }
 479                 priv->free_skbs += num_skbs;
 480                 spin_unlock_irqrestore(&priv->lock, flags);
 481 #ifdef CPMAC_DEBUG
 482                 printk("%s: allocated %d skbs\n", priv->dev->name, num_skbs);
 483 #endif
 484         }
 485 }
 486
 487 static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
 488 {
 489         unsigned long flags;
 490         int len, chan;
 491         struct cpmac_desc *desc;
 492         struct cpmac_priv *priv = netdev_priv(dev);
 493
 494         len = skb->len;
 495         if (unlikely(len < ETH_ZLEN)) {
 496                 if (unlikely(skb_padto(skb, ETH_ZLEN))) {
 497                         if (printk_ratelimit())
 498                                 printk(KERN_NOTICE "%s: padding failed, dropping\n",
 499                                        dev->name);
 500                         spin_lock_irqsave(&priv->lock, flags);
 501                         priv->stats.tx_dropped++;
 502                         spin_unlock_irqrestore(&priv->lock, flags);
 503                         return -ENOMEM;
 504                 }
 505                 len = ETH_ZLEN;
 506         }
 507         spin_lock_irqsave(&priv->lock, flags);
 508         chan = priv->tx_tail++;
 509         priv->tx_tail %= 8;
 510         if (priv->tx_tail == priv->tx_head)
 511                 netif_stop_queue(dev);
 512
 513         desc = &priv->desc_ring[chan];
 514         dma_cache_inv((u32)desc, 16);
 515         if (desc->dataflags & CPMAC_OWN) {
 516                 printk(KERN_NOTICE "%s: tx dma ring full, dropping\n", dev->name);
 517                 spin_lock_irqsave(&priv->lock, flags);
 518                 priv->stats.tx_dropped++;
 519                 spin_unlock_irqrestore(&priv->lock, flags);
 520                 return -ENOMEM;
 521         }
 522
 523         dev->trans_start = jiffies;
 524         desc->jiffies = dev->trans_start;
 525         spin_unlock_irqrestore(&priv->lock, flags);
 526
 527         desc->dataflags = CPMAC_SOP | CPMAC_EOP | CPMAC_OWN;
 528         desc->skb = skb;
 529         desc->hw_data = virt_to_phys(skb->data);
 530         dma_cache_wback((u32)skb->data, len);
 531         desc->buflen = len;
 532         desc->datalen = len;
 533         desc->hw_next = 0;
 534         dma_cache_wback((u32)desc, 16);
 535         priv->regs->tx_ptr[chan] = virt_to_phys(desc);
 536         return 0;
 537 }
 538
 539 static void cpmac_end_xmit(struct net_device *dev, int channel)
 540 {
 541         struct cpmac_desc *desc;
 542         struct cpmac_priv *priv = netdev_priv(dev);
 543
 544         spin_lock(&priv->lock);
 545         desc = &priv->desc_ring[channel];
 546         priv->regs->tx_ack[channel] = virt_to_phys(desc);
 547         if (likely(desc->skb)) {
 548                 priv->stats.tx_packets++;
 549                 priv->stats.tx_bytes += desc->skb->len;
 550                 dev_kfree_skb_irq(desc->skb);
 551                 if (priv->tx_head == channel) {
 552                         while ((desc->dataflags & CPMAC_OWN) == 0) {
 553                                 priv->tx_head++;
 554                                 priv->tx_head %= 8;
 555                                 if (priv->tx_head == priv->tx_tail)
 556                                         break;
 557                                 desc = &priv->desc_ring[priv->tx_head];
 558                         }
 559                 }
 560                 if (netif_queue_stopped(dev))
 561                         netif_wake_queue(dev);
 562         } else {
 563                 if (printk_ratelimit())
 564                         printk(KERN_NOTICE "%s: end_xmit: spurious interrupt\n",
 565                                dev->name);
 566         }
 567         spin_unlock(&priv->lock);
 568 }
 569
 570 static void cpmac_reset(struct net_device *dev)
 571 {
 572         int i;
 573         struct cpmac_priv *priv = netdev_priv(dev);
 574
 575         ar7_device_reset(priv->config->reset_bit);
 576         priv->regs->rx_ctrl.control &= ~1;
 577         priv->regs->tx_ctrl.control &= ~1;
 578         for (i = 0; i < 8; i++) {
 579                 priv->regs->tx_ptr[i] = 0;
 580                 priv->regs->rx_ptr[i] = 0;
 581         }
 582         priv->regs->mac_control &= ~MAC_MII; /* disable mii */
 583 }
 584
 585 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 586 static void
 587 cpmac_full_reset(struct work_struct *work)
 588 {
 589         struct cpmac_priv *priv = container_of(work, struct cpmac_priv,
 590                                                alloc_work);
 591         struct net_device *dev = priv->dev;
 592 #else
 593 static void
 594 cpmac_full_reset(void *data)
 595 {
 596         struct net_device *dev = (struct net_device*)data;
 597 #endif
 598
 599         cpmac_stop(dev);
 600         cpmac_open(dev);
 601 }
 602
 603
 604 static irqreturn_t cpmac_irq(int irq, void *dev_id)
 605 {
 606         struct net_device *dev = (struct net_device *)dev_id;
 607         struct cpmac_priv *priv = netdev_priv(dev);
 608         u32 status;
 609
 610         if (!dev)
 611                 return IRQ_NONE;
 612
 613         status = priv->regs->mac_int_vector;
 614
 615         if (status & INTST_TX) {
 616                 cpmac_end_xmit(dev, (status & 7));
 617         }
 618
 619         if (status & INTST_RX) {
 620                 cpmac_rx(dev, (status >> 8) & 7);
 621         }
 622
 623         if (unlikely(status & INTST_HOST)) { /* host interrupt ??? */
 624                 printk("%s: host int, something bad happened - mac status: 0x%08x\n", dev->name, priv->regs->mac_status);
 625
 626                 /* try to recover */
 627                 cpmac_reset(dev);
 628                 schedule_work(&priv->reset_work);
 629         }
 630
 631         if (unlikely(status & INTST_STATUS)) { /* status interrupt ??? */
 632                 printk("%s: status int, what are we gonna do?\n", dev->name);
 633         }
 634
 635         priv->regs->mac_eoi_vector = 0;
 636
 637         return IRQ_HANDLED;
 638 }
 639
 640 static void cpmac_tx_timeout(struct net_device *dev)
 641 {
 642         struct cpmac_priv *priv = netdev_priv(dev);
 643         struct cpmac_desc *desc;
 644
 645         priv->stats.tx_errors++;
 646         desc = &priv->desc_ring[priv->tx_head++];
 647         priv->tx_head %= 8;
 648         printk("Transmit timeout at %ld, latency %ld\n", jiffies,
 649                jiffies - desc->jiffies);
 650         if (desc->skb)
 651                 dev_kfree_skb(desc->skb);
 652         netif_wake_queue(dev);
 653 }
 654
 655 static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 656 {
 657         struct cpmac_priv *priv = netdev_priv(dev);
 658         if (!(netif_running(dev)))
 659                 return -EINVAL;
 660         if (!priv->phy)
 661                 return -EINVAL;
 662         return phy_mii_ioctl(priv->phy, if_mii(ifr), cmd);
 663 }
 664
 665 static int cpmac_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 666 {
 667         struct cpmac_priv *priv = netdev_priv(dev);
 668
 669         if (priv->phy)
 670                 return phy_ethtool_gset(priv->phy, cmd);
 671
 672         return -EINVAL;
 673 }
 674
 675 static int cpmac_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 676 {
 677         struct cpmac_priv *priv = netdev_priv(dev);
 678
 679         if (!capable(CAP_NET_ADMIN))
 680                 return -EPERM;
 681
 682         if (priv->phy)
 683                 return phy_ethtool_sset(priv->phy, cmd);
 684
 685         return -EINVAL;
 686 }
 687
 688 static void cpmac_get_drvinfo(struct net_device *dev,
 689                               struct ethtool_drvinfo *info)
 690 {
 691         strcpy(info->driver, "cpmac");
 692         strcpy(info->version, "0.0.3");
 693         info->fw_version[0] = '\0';
 694         sprintf(info->bus_info, "%s", "cpmac");
 695         info->regdump_len = 0;
 696 }
 697
 698 static const struct ethtool_ops cpmac_ethtool_ops = {
 699         .get_settings = cpmac_get_settings,
 700         .set_settings = cpmac_set_settings,
 701         .get_drvinfo = cpmac_get_drvinfo,
 702         .get_link = ethtool_op_get_link,
 703 };
 704
 705 static struct net_device_stats *cpmac_stats(struct net_device *dev)
 706 {
 707         struct cpmac_priv *priv = netdev_priv(dev);
 708
 709         if (netif_device_present(dev))
 710                 return &priv->stats;
 711
 712         return NULL;
 713 }
 714
 715 static int cpmac_change_mtu(struct net_device *dev, int mtu)
 716 {
 717         unsigned long flags;
 718         struct cpmac_priv *priv = netdev_priv(dev);
 719         spinlock_t *lock = &priv->lock;
 720
 721         if ((mtu < 68) || (mtu > 1500))
 722                 return -EINVAL;
 723
 724         spin_lock_irqsave(lock, flags);
 725         dev->mtu = mtu;
 726         spin_unlock_irqrestore(lock, flags);
 727
 728         return 0;
 729 }
 730
 731 static void cpmac_adjust_link(struct net_device *dev)
 732 {
 733         struct cpmac_priv *priv = netdev_priv(dev);
 734         unsigned long flags;
 735         int new_state = 0;
 736
 737         spin_lock_irqsave(&priv->lock, flags);
 738         if (priv->phy->link) {
 739                 if (priv->phy->duplex != priv->oldduplex) {
 740                         new_state = 1;
 741                         priv->oldduplex = priv->phy->duplex;
 742                 }
 743
 744                 if (priv->phy->speed != priv->oldspeed) {
 745                         new_state = 1;
 746                         priv->oldspeed = priv->phy->speed;
 747                 }
 748
 749                 if (!priv->oldlink) {
 750                         new_state = 1;
 751                         priv->oldlink = 1;
 752                         netif_schedule(dev);
 753                 }
 754         } else if (priv->oldlink) {
 755                 new_state = 1;
 756                 priv->oldlink = 0;
 757                 priv->oldspeed = 0;
 758                 priv->oldduplex = -1;
 759         }
 760
 761         if (new_state)
 762                 phy_print_status(priv->phy);
 763
 764         spin_unlock_irqrestore(&priv->lock, flags);
 765 }
 766
 767 static int cpmac_open(struct net_device *dev)
 768 {
 769         int i, size, res;
 770         struct cpmac_priv *priv = netdev_priv(dev);
 771         struct cpmac_desc *desc;
 772         struct sk_buff *skb;
 773
 774 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 775         priv->phy = phy_connect(dev, priv->phy_name, &cpmac_adjust_link,
 776                                 0, PHY_INTERFACE_MODE_MII);
 777 #else
 778         priv->phy = phy_connect(dev, priv->phy_name, &cpmac_adjust_link, 0);
 779 #endif
 780         if (IS_ERR(priv->phy)) {
 781                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 782                 return PTR_ERR(priv->phy);
 783         }
 784
 785         if (!request_mem_region(dev->mem_start, dev->mem_end -
 786                                 dev->mem_start, dev->name)) {
 787                 printk("%s: failed to request registers\n",
 788                        dev->name);
 789                 res = -ENXIO;
 790                 goto fail_reserve;
 791         }
 792
 793         priv->regs = ioremap_nocache(dev->mem_start, dev->mem_end -
 794                                      dev->mem_start);
 795         if (!priv->regs) {
 796                 printk("%s: failed to remap registers\n", dev->name);
 797                 res = -ENXIO;
 798                 goto fail_remap;
 799         }
 800
 801         priv->rx_head = NULL;
 802         size = sizeof(struct cpmac_desc) * (CPMAC_RX_RING_SIZE +
 803                                             CPMAC_TX_RING_SIZE);
 804         priv->desc_ring = (struct cpmac_desc *)kmalloc(size, GFP_KERNEL);
 805         if (!priv->desc_ring) {
 806                 res = -ENOMEM;
 807                 goto fail_alloc;
 808         }
 809
 810         memset((char *)priv->desc_ring, 0, size);
 811
 812         priv->skb_pool = NULL;
 813         priv->free_skbs = 0;
 814         priv->rx_head = &priv->desc_ring[CPMAC_TX_RING_SIZE];
 815
 816 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 817         INIT_WORK(&priv->alloc_work, cpmac_alloc_skbs);
 818         INIT_WORK(&priv->reset_work, cpmac_full_reset);
 819 #else
 820         INIT_WORK(&priv->alloc_work, cpmac_alloc_skbs, dev);
 821         INIT_WORK(&priv->reset_work, cpmac_full_reset, dev);
 822 #endif
 823         schedule_work(&priv->alloc_work);
 824         flush_scheduled_work();
 825
 826         for (i = 0; i < CPMAC_RX_RING_SIZE; i++) {
 827                 desc = &priv->rx_head[i];
 828                 skb = cpmac_get_skb(dev);
 829                 if (!skb) {
 830                         res = -ENOMEM;
 831                         goto fail_desc;
 832                 }
 833                 desc->skb = skb;
 834                 desc->hw_data = virt_to_phys(skb->data);
 835                 desc->buflen = CPMAC_SKB_SIZE;
 836                 desc->dataflags = CPMAC_OWN;
 837                 desc->next = &priv->rx_head[i + 1];
 838                 desc->hw_next = virt_to_phys(desc->next);
 839                 dma_cache_wback((u32)desc, 16);
 840         }
 841         priv->rx_tail = &priv->rx_head[CPMAC_RX_RING_SIZE - 1];
 842         priv->rx_tail->next = priv->rx_head;
 843         priv->rx_tail->hw_next = 0;
 844
 845         cpmac_reset(dev);
 846         for (i = 0; i < 8; i++)
 847                 priv->regs->tx_ptr[i] = 0;
 848         priv->regs->rx_ptr[0] = virt_to_phys(priv->rx_head);
 849
 850         priv->regs->mbp = MBP_RXSHORT | MBP_RXBCAST | MBP_RXMCAST;
 851         priv->regs->unicast_enable = 0x1;
 852         priv->regs->unicast_clear = 0xfe;
 853         priv->regs->buffer_offset = 0;
 854         for (i = 0; i < 8; i++)
 855                 priv->regs->mac_addr_low[i] = dev->dev_addr[5];
 856         priv->regs->mac_addr_mid = dev->dev_addr[4];
 857         priv->regs->mac_addr_high = dev->dev_addr[0] | (dev->dev_addr[1] << 8)
 858                 | (dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
 859         priv->regs->max_len = CPMAC_SKB_SIZE;
 860         priv->regs->rx_int.enable = 0x1;
 861         priv->regs->rx_int.clear = 0xfe;
 862         priv->regs->tx_int.enable = 0xff;
 863         priv->regs->tx_int.clear = 0;
 864         priv->regs->mac_int_enable = 3;
 865         priv->regs->mac_int_clear = 0xfc;
 866
 867         if((res = request_irq(dev->irq, cpmac_irq, SA_INTERRUPT,
 868                               dev->name, dev))) {
 869                 printk("%s: failed to obtain irq\n", dev->name);
 870                 goto fail_irq;
 871         }
 872
 873         priv->regs->rx_ctrl.control |= 1;
 874         priv->regs->tx_ctrl.control |= 1;
 875         priv->regs->mac_control |= MAC_MII | MAC_FDX;
 876
 877         priv->phy->state = PHY_CHANGELINK;
 878         phy_start(priv->phy);
 879
 880         netif_start_queue(dev);
 881         return 0;
 882
 883 fail_irq:
 884 fail_desc:
 885         for (i = 0; i < CPMAC_RX_RING_SIZE; i++)
 886                 if (priv->rx_head[i].skb)
 887                         kfree_skb(priv->rx_head[i].skb);
 888 fail_alloc:
 889         kfree(priv->desc_ring);
 890
 891         for (skb = priv->skb_pool; skb; skb = priv->skb_pool) {
 892                 priv->skb_pool = skb->next;
 893                 kfree_skb(skb);
 894         }
 895
 896         iounmap(priv->regs);
 897
 898 fail_remap:
 899         release_mem_region(dev->mem_start, dev->mem_end -
 900                            dev->mem_start);
 901
 902 fail_reserve:
 903         phy_disconnect(priv->phy);
 904
 905         return res;
 906 }
 907
 908 static int cpmac_stop(struct net_device *dev)
 909 {
 910         int i;
 911         struct sk_buff *skb;
 912         struct cpmac_priv *priv = netdev_priv(dev);
 913
 914         netif_stop_queue(dev);
 915
 916         phy_stop(priv->phy);
 917         phy_disconnect(priv->phy);
 918         priv->phy = NULL;
 919
 920         cpmac_reset(dev);
 921
 922         for (i = 0; i < 8; i++) {
 923                 priv->regs->rx_ptr[i] = 0;
 924                 priv->regs->tx_ptr[i] = 0;
 925                 priv->regs->mbp = 0;
 926         }
 927
 928         free_irq(dev->irq, dev);
 929         release_mem_region(dev->mem_start, dev->mem_end -
 930                            dev->mem_start);
 931
 932         cancel_delayed_work(&priv->alloc_work);
 933         flush_scheduled_work();
 934
 935         priv->rx_head = &priv->desc_ring[CPMAC_TX_RING_SIZE];
 936         for (i = 0; i < CPMAC_RX_RING_SIZE; i++)
 937                 if (priv->rx_head[i].skb)
 938                         kfree_skb(priv->rx_head[i].skb);
 939
 940         kfree(priv->desc_ring);
 941
 942         for (skb = priv->skb_pool; skb; skb = priv->skb_pool) {
 943                 priv->skb_pool = skb->next;
 944                 kfree_skb(skb);
 945         }
 946
 947         return 0;
 948 }
 949
 950 static int external_switch = 0;
 951
 952 static int __devinit cpmac_probe(struct platform_device *pdev)
 953 {
 954         int i, rc, phy_id;
 955         struct resource *res;
 956         struct cpmac_priv *priv;
 957         struct net_device *dev;
 958         struct plat_cpmac_data *pdata;
 959
 960         if (strcmp(pdev->name, "cpmac") != 0)
 961                 return -ENODEV;
 962
 963         pdata = pdev->dev.platform_data;
 964
 965         for (phy_id = 0; phy_id < PHY_MAX_ADDR; phy_id++) {
 966                 if (!(pdata->phy_mask & (1 << phy_id)))
 967                         continue;
 968                 if (!cpmac_mii.phy_map[phy_id])
 969                         continue;
 970                 break;
 971         }
 972
 973         if (phy_id == PHY_MAX_ADDR) {
 974                 if (external_switch) {
 975                         phy_id = 0;
 976                 } else {
 977                         printk("cpmac: no PHY present\n");
 978                         return -ENODEV;
 979                 }
 980         }
 981
 982         dev = alloc_etherdev(sizeof(struct cpmac_priv));
 983
 984         if (!dev) {
 985                 printk(KERN_ERR "cpmac: Unable to allocate net_device structure!\n");
 986                 return -ENOMEM;
 987         }
 988
 989         SET_MODULE_OWNER(dev);
 990         platform_set_drvdata(pdev, dev);
 991         priv = netdev_priv(dev);
 992
 993         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 994         if (!res) {
 995                 rc = -ENODEV;
 996                 goto fail;
 997         }
 998
 999         dev->mem_start = res->start;
1000         dev->mem_end = res->end;
1001         dev->irq = platform_get_irq_byname(pdev, "irq");
1002
1003         dev->mtu                = 1500;
1004         dev->open               = cpmac_open;
1005         dev->stop               = cpmac_stop;
1006         dev->set_config         = cpmac_config;
1007         dev->hard_start_xmit    = cpmac_start_xmit;
1008         dev->do_ioctl           = cpmac_ioctl;
1009         dev->get_stats          = cpmac_stats;
1010         dev->change_mtu         = cpmac_change_mtu;
1011         dev->set_mac_address    = cpmac_set_mac_address;
1012         dev->set_multicast_list = cpmac_set_multicast_list;
1013         dev->tx_timeout         = cpmac_tx_timeout;
1014         dev->ethtool_ops        = &cpmac_ethtool_ops;
1015
1016         memset(priv, 0, sizeof(struct cpmac_priv));
1017         spin_lock_init(&priv->lock);
1018         priv->msg_enable = netif_msg_init(NETIF_MSG_WOL, 0x3fff);
1019         priv->config = pdata;
1020         priv->dev = dev;
1021         memcpy(dev->dev_addr, priv->config->dev_addr, sizeof(dev->dev_addr));
1022         if (phy_id == 31) {
1023                 snprintf(priv->phy_name, BUS_ID_SIZE, PHY_ID_FMT,
1024                          cpmac_mii.id, phy_id);
1025         } else {
1026                 snprintf(priv->phy_name, BUS_ID_SIZE, "fixed@%d:%d", 100, 1);
1027         }
1028
1029         if ((rc = register_netdev(dev))) {
1030                 printk("cpmac: error %i registering device %s\n",
1031                        rc, dev->name);
1032                 goto fail;
1033         }
1034
1035         printk("cpmac: device %s (regs: %p, irq: %d, phy: %s, mac: ",
1036                dev->name, (u32 *)dev->mem_start, dev->irq,
1037                priv->phy_name);
1038         for (i = 0; i < 6; i++) {
1039                 printk("%02x", dev->dev_addr[i]);
1040                 if (i < 5) printk(":");
1041                 else printk(")\n");
1042         }
1043
1044         return 0;
1045
1046 fail:
1047         free_netdev(dev);
1048         return rc;
1049 }
1050
1051 static int __devexit cpmac_remove(struct platform_device *pdev)
1052 {
1053         struct net_device *dev = platform_get_drvdata(pdev);
1054         unregister_netdev(dev);
1055         free_netdev(dev);
1056         return 0;
1057 }
1058
1059 static struct platform_driver cpmac_driver = {
1060         .driver.name = "cpmac",
1061         .probe = cpmac_probe,
1062         .remove = cpmac_remove,
1063 };
1064
1065 int __devinit cpmac_init(void)
1066 {
1067         volatile u32 mask;
1068         int i, res;
1069         cpmac_mii.priv = (struct cpmac_mdio_regs *)
1070                 ioremap_nocache(AR7_REGS_MDIO, sizeof(struct cpmac_mdio_regs));
1071
1072         if (!cpmac_mii.priv) {
1073                 printk("Can't ioremap mdio registers\n");
1074                 return -ENXIO;
1075         }
1076
1077 #warning FIXME: unhardcode gpio&reset bits
1078         ar7_gpio_disable(26);
1079         ar7_gpio_disable(27);
1080         ar7_device_reset(17);
1081         ar7_device_reset(21);
1082         ar7_device_reset(26);
1083
1084         cpmac_mii.reset(&cpmac_mii);
1085
1086         for (i = 0; i < 300000; i++) {
1087                 mask = ((struct cpmac_mdio_regs *)cpmac_mii.priv)->alive;
1088                 if (mask)
1089                         break;
1090         }
1091
1092         mask &= 0x7fffffff;
1093         if (mask & (mask - 1)) {
1094                 external_switch = 1;
1095                 mask = 0;
1096         }
1097
1098         cpmac_mii.phy_mask = ~(mask | 0x80000000);
1099
1100         res = mdiobus_register(&cpmac_mii);
1101         if (res)
1102                 goto fail_mii;
1103
1104         res = platform_driver_register(&cpmac_driver);
1105         if (res)
1106                 goto fail_cpmac;
1107
1108         return 0;
1109
1110 fail_cpmac:
1111         mdiobus_unregister(&cpmac_mii);
1112
1113 fail_mii:
1114         iounmap(cpmac_mii.priv);
1115
1116         return res;
1117 }
1118
1119 void __devexit cpmac_exit(void)
1120 {
1121         platform_driver_unregister(&cpmac_driver);
1122         mdiobus_unregister(&cpmac_mii);
1123 }
1124
1125 module_init(cpmac_init);
1126 module_exit(cpmac_exit);