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 static int rx_ring_size = 64;
  48 static int disable_napi = 0;
  49 module_param(rx_ring_size, int, 64);
  50 module_param(disable_napi, int, 0);
  51 MODULE_PARM_DESC(rx_ring_size, "Size of rx ring (in skbs)");
  52 MODULE_PARM_DESC(disable_napi, "Disable NAPI polling");
  53
  54 /* Register definitions */
  55 struct cpmac_control_regs {
  56         volatile u32 revision;
  57         volatile u32 control;
  58         volatile u32 teardown;
  59         volatile u32 unused;
  60 } __attribute__ ((packed));
  61
  62 struct cpmac_int_regs {
  63         volatile u32 stat_raw;
  64         volatile u32 stat_masked;
  65         volatile u32 enable;
  66         volatile u32 clear;
  67 } __attribute__ ((packed));
  68
  69 struct cpmac_stats {
  70         volatile u32 good;
  71         volatile u32 bcast;
  72         volatile u32 mcast;
  73         volatile u32 pause;
  74         volatile u32 crc_error;
  75         volatile u32 align_error;
  76         volatile u32 oversized;
  77         volatile u32 jabber;
  78         volatile u32 undersized;
  79         volatile u32 fragment;
  80         volatile u32 filtered;
  81         volatile u32 qos_filtered;
  82         volatile u32 octets;
  83 } __attribute__ ((packed));
  84
  85 struct cpmac_regs {
  86         struct cpmac_control_regs tx_ctrl;
  87         struct cpmac_control_regs rx_ctrl;
  88         volatile u32 unused1[56];
  89         volatile u32 mbp;
  90 /* MBP bits */
  91 #define MBP_RXPASSCRC         0x40000000
  92 #define MBP_RXQOS             0x20000000
  93 #define MBP_RXNOCHAIN         0x10000000
  94 #define MBP_RXCMF             0x01000000
  95 #define MBP_RXSHORT           0x00800000
  96 #define MBP_RXCEF             0x00400000
  97 #define MBP_RXPROMISC         0x00200000
  98 #define MBP_PROMISCCHAN(chan) (((chan) & 0x7) << 16)
  99 #define MBP_RXBCAST           0x00002000
 100 #define MBP_BCASTCHAN(chan)   (((chan) & 0x7) << 8)
 101 #define MBP_RXMCAST           0x00000020
 102 #define MBP_MCASTCHAN(chan)   ((chan) & 0x7)
 103         volatile u32 unicast_enable;
 104         volatile u32 unicast_clear;
 105         volatile u32 max_len;
 106         volatile u32 buffer_offset;
 107         volatile u32 filter_flow_threshold;
 108         volatile u32 unused2[2];
 109         volatile u32 flow_thre[8];
 110         volatile u32 free_buffer[8];
 111         volatile u32 mac_control;
 112 #define MAC_TXPTYPE  0x00000200
 113 #define MAC_TXPACE   0x00000040
 114 #define MAC_MII      0x00000020
 115 #define MAC_TXFLOW   0x00000010
 116 #define MAC_RXFLOW   0x00000008
 117 #define MAC_MTEST    0x00000004
 118 #define MAC_LOOPBACK 0x00000002
 119 #define MAC_FDX      0x00000001
 120         volatile u32 mac_status;
 121 #define MACST_QOS    0x4
 122 #define MACST_RXFLOW 0x2
 123 #define MACST_TXFLOW 0x1
 124         volatile u32 emc_control;
 125         volatile u32 unused3;
 126         struct cpmac_int_regs tx_int;
 127         volatile u32 mac_int_vector;
 128 /* Int Status bits */
 129 #define INTST_STATUS 0x80000
 130 #define INTST_HOST   0x40000
 131 #define INTST_RX     0x20000
 132 #define INTST_TX     0x10000
 133         volatile u32 mac_eoi_vector;
 134         volatile u32 unused4[2];
 135         struct cpmac_int_regs rx_int;
 136         volatile u32 mac_int_stat_raw;
 137         volatile u32 mac_int_stat_masked;
 138         volatile u32 mac_int_enable;
 139         volatile u32 mac_int_clear;
 140         volatile u32 mac_addr_low[8];
 141         volatile u32 mac_addr_mid;
 142         volatile u32 mac_addr_high;
 143         volatile u32 mac_hash_low;
 144         volatile u32 mac_hash_high;
 145         volatile u32 boff_test;
 146         volatile u32 pac_test;
 147         volatile u32 rx_pause;
 148         volatile u32 tx_pause;
 149         volatile u32 unused5[2];
 150         struct cpmac_stats rx_stats;
 151         struct cpmac_stats tx_stats;
 152         volatile u32 unused6[232];
 153         volatile u32 tx_ptr[8];
 154         volatile u32 rx_ptr[8];
 155         volatile u32 tx_ack[8];
 156         volatile u32 rx_ack[8];
 157
 158 } __attribute__ ((packed));
 159
 160 struct cpmac_mdio_regs {
 161         volatile u32 version;
 162         volatile u32 control;
 163 #define MDIOC_IDLE        0x80000000
 164 #define MDIOC_ENABLE      0x40000000
 165 #define MDIOC_PREAMBLE    0x00100000
 166 #define MDIOC_FAULT       0x00080000
 167 #define MDIOC_FAULTDETECT 0x00040000
 168 #define MDIOC_INTTEST     0x00020000
 169 #define MDIOC_CLKDIV(div) ((div) & 0xff)
 170         volatile u32 alive;
 171         volatile u32 link;
 172         struct cpmac_int_regs link_int;
 173         struct cpmac_int_regs user_int;
 174         u32 unused[20];
 175         volatile u32 access;
 176 #define MDIO_BUSY       0x80000000
 177 #define MDIO_WRITE      0x40000000
 178 #define MDIO_REG(reg)   (((reg) & 0x1f) << 21)
 179 #define MDIO_PHY(phy)   (((phy) & 0x1f) << 16)
 180 #define MDIO_DATA(data) ((data) & 0xffff)
 181         volatile u32 physel;
 182 } __attribute__ ((packed));
 183
 184 /* Descriptor */
 185 struct cpmac_desc {
 186         u32 hw_next;
 187         u32 hw_data;
 188         u16 buflen;
 189         u16 bufflags;
 190         u16 datalen;
 191         u16 dataflags;
 192 /* Flags bits */
 193 #define CPMAC_SOP 0x8000
 194 #define CPMAC_EOP 0x4000
 195 #define CPMAC_OWN 0x2000
 196 #define CPMAC_EOQ 0x1000
 197         struct sk_buff *skb;
 198         struct cpmac_desc *next;
 199 } __attribute__ ((packed));
 200
 201 struct cpmac_priv {
 202         struct net_device_stats stats;
 203         spinlock_t lock;
 204         struct sk_buff *skb_pool;
 205         int free_skbs;
 206         struct cpmac_desc *rx_head;
 207         int tx_head, tx_tail;
 208         struct cpmac_desc *desc_ring;
 209         struct cpmac_regs *regs;
 210         struct mii_bus *mii_bus;
 211         struct phy_device *phy;
 212         char phy_name[BUS_ID_SIZE];
 213         struct plat_cpmac_data *config;
 214         int oldlink, oldspeed, oldduplex;
 215         u32 msg_enable;
 216         struct net_device *dev;
 217         struct work_struct alloc_work;
 218 };
 219
 220 static irqreturn_t cpmac_irq(int, void *);
 221 static void cpmac_reset(struct net_device *dev);
 222 static void cpmac_hw_init(struct net_device *dev);
 223 static int cpmac_stop(struct net_device *dev);
 224 static int cpmac_open(struct net_device *dev);
 225
 226 #define CPMAC_LOW_THRESH 32
 227 #define CPMAC_ALLOC_SIZE 64
 228 #define CPMAC_SKB_SIZE 1518
 229 #define CPMAC_TX_RING_SIZE 8
 230
 231 #ifdef CPMAC_DEBUG
 232 static void cpmac_dump_regs(u32 *base, int count)
 233 {
 234         int i;
 235         for (i = 0; i < (count + 3) / 4; i++) {
 236                 if (i % 4 == 0) printk("\nCPMAC[0x%04x]:", i * 4);
 237                 printk(" 0x%08x", *(base + i));
 238         }
 239         printk("\n");
 240 }
 241 #endif
 242
 243 static int cpmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
 244 {
 245         struct cpmac_mdio_regs *regs = (struct cpmac_mdio_regs *)bus->priv;
 246         volatile u32 val;
 247
 248         while ((val = regs->access) & MDIO_BUSY);
 249         regs->access = MDIO_BUSY | MDIO_REG(regnum & 0x1f) |
 250                 MDIO_PHY(phy_id & 0x1f);
 251         while ((val = regs->access) & MDIO_BUSY);
 252
 253         return val & 0xffff;
 254 }
 255
 256 static int cpmac_mdio_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
 257 {
 258         struct cpmac_mdio_regs *regs = (struct cpmac_mdio_regs *)bus->priv;
 259         volatile u32 tmp;
 260
 261         while ((tmp = regs->access) & MDIO_BUSY);
 262         regs->access = MDIO_BUSY | MDIO_WRITE |
 263                 MDIO_REG(regnum & 0x1f) | MDIO_PHY(phy_id & 0x1f) |
 264                 val;
 265
 266         return 0;
 267 }
 268
 269 static int cpmac_mdio_reset(struct mii_bus *bus)
 270 {
 271         struct cpmac_mdio_regs *regs = (struct cpmac_mdio_regs *)bus->priv;
 272
 273         ar7_device_reset(AR7_RESET_BIT_MDIO);
 274         regs->control = MDIOC_ENABLE |
 275                 MDIOC_CLKDIV(ar7_cpmac_freq() / 2200000 - 1);
 276
 277         return 0;
 278 }
 279
 280 static int mii_irqs[PHY_MAX_ADDR] = { PHY_POLL, };
 281
 282 static struct mii_bus cpmac_mii = {
 283         .name = "cpmac-mii",
 284         .read = cpmac_mdio_read,
 285         .write = cpmac_mdio_write,
 286         .reset = cpmac_mdio_reset,
 287         .irq = mii_irqs,
 288 };
 289
 290 static int cpmac_config(struct net_device *dev, struct ifmap *map)
 291 {
 292         if (dev->flags & IFF_UP)
 293                 return -EBUSY;
 294
 295         /* Don't allow changing the I/O address */
 296         if (map->base_addr != dev->base_addr)
 297                 return -EOPNOTSUPP;
 298
 299         /* ignore other fields */
 300         return 0;
 301 }
 302
 303 static int cpmac_set_mac_address(struct net_device *dev, void *addr)
 304 {
 305         struct sockaddr *sa = addr;
 306
 307         if (dev->flags & IFF_UP)
 308                 return -EBUSY;
 309
 310         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 311
 312         return 0;
 313 }
 314
 315 static void cpmac_set_multicast_list(struct net_device *dev)
 316 {
 317         struct dev_mc_list *iter;
 318         int i;
 319         int hash, tmp;
 320         int hashlo = 0, hashhi = 0;
 321         struct cpmac_priv *priv = netdev_priv(dev);
 322
 323         if(dev->flags & IFF_PROMISC) {
 324                 priv->regs->mbp &= ~MBP_PROMISCCHAN(0); /* promisc channel 0 */
 325                 priv->regs->mbp |= MBP_RXPROMISC;
 326         } else {
 327                 priv->regs->mbp &= ~MBP_RXPROMISC;
 328                 if(dev->flags & IFF_ALLMULTI) {
 329                         /* enable all multicast mode */
 330                         priv->regs->mac_hash_low = 0xffffffff;
 331                         priv->regs->mac_hash_high = 0xffffffff;
 332                 } else {
 333                         for(i = 0, iter = dev->mc_list; i < dev->mc_count;
 334                             i++, iter = iter->next) {
 335                                 hash = 0;
 336                                 tmp = iter->dmi_addr[0];
 337                                 hash  ^= (tmp >> 2) ^ (tmp << 4);
 338                                 tmp = iter->dmi_addr[1];
 339                                 hash  ^= (tmp >> 4) ^ (tmp << 2);
 340                                 tmp = iter->dmi_addr[2];
 341                                 hash  ^= (tmp >> 6) ^ tmp;
 342                                 tmp = iter->dmi_addr[4];
 343                                 hash  ^= (tmp >> 2) ^ (tmp << 4);
 344                                 tmp = iter->dmi_addr[5];
 345                                 hash  ^= (tmp >> 4) ^ (tmp << 2);
 346                                 tmp = iter->dmi_addr[6];
 347                                 hash  ^= (tmp >> 6) ^ tmp;
 348                                 hash &= 0x3f;
 349                                 if(hash < 32) {
 350                                         hashlo |= 1<<hash;
 351                                 } else {
 352                                         hashhi |= 1<<(hash - 32);
 353                                 }
 354                         }
 355
 356                         priv->regs->mac_hash_low = hashlo;
 357                         priv->regs->mac_hash_high = hashhi;
 358                 }
 359         }
 360 }
 361
 362 static struct sk_buff *cpmac_get_skb(struct net_device *dev)
 363 {
 364         struct sk_buff *skb;
 365         struct cpmac_priv *priv = netdev_priv(dev);
 366
 367         skb = priv->skb_pool;
 368         if (likely(skb)) {
 369                 priv->skb_pool = skb->next;
 370         } else {
 371                 skb = dev_alloc_skb(CPMAC_SKB_SIZE + 2);
 372                 if (skb) {
 373                         skb->next = NULL;
 374                         skb_reserve(skb, 2);
 375                         skb->dev = priv->dev;
 376                 }
 377         }
 378
 379         if (likely(priv->free_skbs))
 380                 priv->free_skbs--;
 381
 382         if (priv->free_skbs < CPMAC_LOW_THRESH)
 383                 schedule_work(&priv->alloc_work);
 384
 385         return skb;
 386 }
 387
 388 static inline struct sk_buff *cpmac_rx_one(struct net_device *dev,
 389                                            struct cpmac_priv *priv,
 390                                            struct cpmac_desc *desc)
 391 {
 392         unsigned long flags;
 393         char *data;
 394         struct sk_buff *skb, *result = NULL;
 395
 396         priv->regs->rx_ack[0] = virt_to_phys(desc);
 397         if (unlikely(!desc->datalen)) {
 398                 if (printk_ratelimit())
 399                         printk(KERN_WARNING "%s: rx: spurious interrupt\n",
 400                                dev->name);
 401                 priv->stats.rx_errors++;
 402                 return NULL;
 403         }
 404
 405         spin_lock_irqsave(&priv->lock, flags);
 406         skb = cpmac_get_skb(dev);
 407         if (likely(skb)) {
 408                 data = (char *)phys_to_virt(desc->hw_data);
 409                 dma_cache_inv((u32)data, desc->datalen);
 410                 skb_put(desc->skb, desc->datalen);
 411                 desc->skb->protocol = eth_type_trans(desc->skb, dev);
 412                 desc->skb->ip_summed = CHECKSUM_NONE;
 413                 priv->stats.rx_packets++;
 414                 priv->stats.rx_bytes += desc->datalen;
 415                 result = desc->skb;
 416                 desc->skb = skb;
 417         } else {
 418 #ifdef CPMAC_DEBUG
 419                 if (printk_ratelimit())
 420                         printk("%s: low on skbs, dropping packet\n",
 421                                dev->name);
 422 #endif
 423                 priv->stats.rx_dropped++;
 424         }
 425         spin_unlock_irqrestore(&priv->lock, flags);
 426
 427         desc->hw_data = virt_to_phys(desc->skb->data);
 428         desc->buflen = CPMAC_SKB_SIZE;
 429         desc->dataflags = CPMAC_OWN;
 430         dma_cache_wback((u32)desc, 16);
 431
 432         return result;
 433 }
 434
 435 static void cpmac_rx(struct net_device *dev)
 436 {
 437         struct sk_buff *skb;
 438         struct cpmac_desc *desc;
 439         struct cpmac_priv *priv = netdev_priv(dev);
 440
 441         spin_lock(&priv->lock);
 442         if (unlikely(!priv->rx_head)) {
 443                 spin_unlock(&priv->lock);
 444                 return;
 445         }
 446
 447         desc = priv->rx_head;
 448         dma_cache_inv((u32)desc, 16);
 449
 450         while ((desc->dataflags & CPMAC_OWN) == 0) {
 451                 skb = cpmac_rx_one(dev, priv, desc);
 452                 if (likely(skb)) {
 453                         netif_rx(skb);
 454                 }
 455                 desc = desc->next;
 456                 dma_cache_inv((u32)desc, 16);
 457         }
 458
 459         priv->rx_head = desc;
 460         priv->regs->rx_ptr[0] = virt_to_phys(desc);
 461         spin_unlock(&priv->lock);
 462 }
 463
 464 static int cpmac_poll(struct net_device *dev, int *budget)
 465 {
 466         struct sk_buff *skb;
 467         struct cpmac_desc *desc;
 468         int received = 0, quota = min(dev->quota, *budget);
 469         struct cpmac_priv *priv = netdev_priv(dev);
 470
 471         if (unlikely(!priv->rx_head)) {
 472                 if (printk_ratelimit())
 473                         printk(KERN_WARNING "%s: rx: polling, but no queue\n",
 474                                dev->name);
 475                 netif_rx_complete(dev);
 476                 return 0;
 477         }
 478
 479         desc = priv->rx_head;
 480         dma_cache_inv((u32)desc, 16);
 481
 482         while ((received < quota) && ((desc->dataflags & CPMAC_OWN) == 0)) {
 483                 skb = cpmac_rx_one(dev, priv, desc);
 484                 if (likely(skb)) {
 485                         netif_receive_skb(skb);
 486                         received++;
 487                 }
 488                 desc = desc->next;
 489                 priv->rx_head = desc;
 490                 dma_cache_inv((u32)desc, 16);
 491         }
 492
 493         *budget -= received;
 494         dev->quota -= received;
 495 #ifdef CPMAC_DEBUG
 496         printk("%s: processed %d packets\n", dev->name, received);
 497 #endif
 498         if (desc->dataflags & CPMAC_OWN) {
 499                 priv->regs->rx_ptr[0] = virt_to_phys(desc);
 500                 netif_rx_complete(dev);
 501                 priv->regs->rx_int.enable = 0x1;
 502                 priv->regs->rx_int.clear = 0xfe;
 503                 return 0;
 504         }
 505
 506         return 1;
 507 }
 508
 509 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 510 static void
 511 cpmac_alloc_skbs(struct work_struct *work)
 512 {
 513         struct cpmac_priv *priv = container_of(work, struct cpmac_priv,
 514                                                alloc_work);
 515 #else
 516 static void
 517 cpmac_alloc_skbs(void *data)
 518 {
 519         struct net_device *dev = (struct net_device*)data;
 520         struct cpmac_priv *priv = netdev_priv(dev);
 521 #endif
 522         unsigned long flags;
 523         int i, num_skbs = 0;
 524         struct sk_buff *skb, *skbs = NULL;
 525
 526         for (i = 0; i < CPMAC_ALLOC_SIZE; i++) {
 527                 skb = alloc_skb(CPMAC_SKB_SIZE + 2, GFP_KERNEL);
 528                 if (!skb)
 529                         break;
 530                 skb->next = skbs;
 531                 skb_reserve(skb, 2);
 532                 skb->dev = priv->dev;
 533                 num_skbs++;
 534                 skbs = skb;
 535         }
 536
 537         if (skbs) {
 538                 spin_lock_irqsave(&priv->lock, flags);
 539                 for (skb = priv->skb_pool; skb && skb->next; skb = skb->next);
 540                 if (!skb) {
 541                         priv->skb_pool = skbs;
 542                 } else {
 543                         skb->next = skbs;
 544                 }
 545                 priv->free_skbs += num_skbs;
 546                 spin_unlock_irqrestore(&priv->lock, flags);
 547 #ifdef CPMAC_DEBUG
 548                 printk("%s: allocated %d skbs\n", priv->dev->name, num_skbs);
 549 #endif
 550         }
 551 }
 552
 553 static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
 554 {
 555         unsigned long flags;
 556         int len, chan;
 557         struct cpmac_desc *desc;
 558         struct cpmac_priv *priv = netdev_priv(dev);
 559
 560         len = skb->len;
 561         if (unlikely(len < ETH_ZLEN)) {
 562                 if (unlikely(skb_padto(skb, ETH_ZLEN))) {
 563                         if (printk_ratelimit())
 564                                 printk(KERN_NOTICE "%s: padding failed, dropping\n",
 565                                        dev->name);
 566                         spin_lock_irqsave(&priv->lock, flags);
 567                         priv->stats.tx_dropped++;
 568                         spin_unlock_irqrestore(&priv->lock, flags);
 569                         return -ENOMEM;
 570                 }
 571                 len = ETH_ZLEN;
 572         }
 573         spin_lock_irqsave(&priv->lock, flags);
 574         chan = priv->tx_tail++;
 575         priv->tx_tail %= 8;
 576         if (priv->tx_tail == priv->tx_head)
 577                 netif_stop_queue(dev);
 578
 579         desc = &priv->desc_ring[chan];
 580         dma_cache_inv((u32)desc, 16);
 581         if (desc->dataflags & CPMAC_OWN) {
 582                 printk(KERN_NOTICE "%s: tx dma ring full, dropping\n", dev->name);
 583                 priv->stats.tx_dropped++;
 584                 spin_unlock_irqrestore(&priv->lock, flags);
 585                 return -ENOMEM;
 586         }
 587
 588         dev->trans_start = jiffies;
 589         desc->dataflags = CPMAC_SOP | CPMAC_EOP | CPMAC_OWN;
 590         desc->skb = skb;
 591         desc->hw_data = virt_to_phys(skb->data);
 592         dma_cache_wback((u32)skb->data, len);
 593         desc->buflen = len;
 594         desc->datalen = len;
 595         desc->hw_next = 0;
 596         dma_cache_wback((u32)desc, 16);
 597         priv->regs->tx_ptr[chan] = virt_to_phys(desc);
 598         spin_unlock_irqrestore(&priv->lock, flags);
 599
 600         return 0;
 601 }
 602
 603 static void cpmac_end_xmit(struct net_device *dev, int channel)
 604 {
 605         struct cpmac_desc *desc;
 606         struct cpmac_priv *priv = netdev_priv(dev);
 607
 608         spin_lock(&priv->lock);
 609         desc = &priv->desc_ring[channel];
 610         priv->regs->tx_ack[channel] = virt_to_phys(desc);
 611         if (likely(desc->skb)) {
 612                 priv->stats.tx_packets++;
 613                 priv->stats.tx_bytes += desc->skb->len;
 614                 dev_kfree_skb_irq(desc->skb);
 615                 if (netif_queue_stopped(dev))
 616                         netif_wake_queue(dev);
 617         } else {
 618                 if (printk_ratelimit())
 619                         printk(KERN_NOTICE "%s: end_xmit: spurious interrupt\n",
 620                                dev->name);
 621         }
 622         spin_unlock(&priv->lock);
 623 }
 624
 625 static void cpmac_reset(struct net_device *dev)
 626 {
 627         int i;
 628         struct cpmac_priv *priv = netdev_priv(dev);
 629
 630         ar7_device_reset(priv->config->reset_bit);
 631         priv->regs->rx_ctrl.control &= ~1;
 632         priv->regs->tx_ctrl.control &= ~1;
 633         for (i = 0; i < 8; i++) {
 634                 priv->regs->tx_ptr[i] = 0;
 635                 priv->regs->rx_ptr[i] = 0;
 636         }
 637         priv->regs->mac_control &= ~MAC_MII; /* disable mii */
 638 }
 639
 640 static inline void cpmac_free_rx_ring(struct net_device *dev)
 641 {
 642         struct cpmac_desc *desc;
 643         int i;
 644         struct cpmac_priv *priv = netdev_priv(dev);
 645
 646         if (unlikely(!priv->rx_head))
 647                 return;
 648
 649         desc = priv->rx_head;
 650         dma_cache_inv((u32)desc, 16);
 651
 652         for (i = 0; i < rx_ring_size; i++) {
 653                 desc->buflen = CPMAC_SKB_SIZE;
 654                 if ((desc->dataflags & CPMAC_OWN) == 0) {
 655                         desc->dataflags = CPMAC_OWN;
 656                         priv->stats.rx_dropped++;
 657                 }
 658                 dma_cache_wback((u32)desc, 16);
 659                 desc = desc->next;
 660                 dma_cache_inv((u32)desc, 16);
 661         }
 662 }
 663
 664 static irqreturn_t cpmac_irq(int irq, void *dev_id)
 665 {
 666         struct net_device *dev = (struct net_device *)dev_id;
 667         struct cpmac_priv *priv = netdev_priv(dev);
 668         u32 status;
 669
 670         if (!dev)
 671                 return IRQ_NONE;
 672
 673         status = priv->regs->mac_int_vector;
 674
 675         if (status & INTST_TX) {
 676                 cpmac_end_xmit(dev, (status & 7));
 677         }
 678
 679         if (status & INTST_RX) {
 680                 if (disable_napi) {
 681                         cpmac_rx(dev);
 682                 } else {
 683                         priv->regs->rx_int.enable = 0;
 684                         priv->regs->rx_int.clear = 0xff;
 685                         netif_rx_schedule(dev);
 686                 }
 687         }
 688
 689         priv->regs->mac_eoi_vector = 0;
 690
 691         if (unlikely(status & (INTST_HOST | INTST_STATUS))) {
 692                 printk(KERN_ERR "%s: hw error, resetting...\n", dev->name);
 693                 spin_lock(&priv->lock);
 694                 phy_stop(priv->phy);
 695                 cpmac_reset(dev);
 696                 cpmac_free_rx_ring(dev);
 697                 cpmac_hw_init(dev);
 698                 spin_unlock(&priv->lock);
 699         }
 700
 701         return IRQ_HANDLED;
 702 }
 703
 704 static void cpmac_tx_timeout(struct net_device *dev)
 705 {
 706         struct cpmac_priv *priv = netdev_priv(dev);
 707         struct cpmac_desc *desc;
 708
 709         priv->stats.tx_errors++;
 710         desc = &priv->desc_ring[priv->tx_head++];
 711         priv->tx_head %= 8;
 712         printk("%s: transmit timeout\n", dev->name);
 713         if (desc->skb)
 714                 dev_kfree_skb(desc->skb);
 715         netif_wake_queue(dev);
 716 }
 717
 718 static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 719 {
 720         struct cpmac_priv *priv = netdev_priv(dev);
 721         if (!(netif_running(dev)))
 722                 return -EINVAL;
 723         if (!priv->phy)
 724                 return -EINVAL;
 725         if ((cmd == SIOCGMIIPHY) || (cmd == SIOCGMIIREG) ||
 726             (cmd == SIOCSMIIREG))
 727                 return phy_mii_ioctl(priv->phy, if_mii(ifr), cmd);
 728
 729         return -EINVAL;
 730 }
 731
 732 static int cpmac_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 733 {
 734         struct cpmac_priv *priv = netdev_priv(dev);
 735
 736         if (priv->phy)
 737                 return phy_ethtool_gset(priv->phy, cmd);
 738
 739         return -EINVAL;
 740 }
 741
 742 static int cpmac_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
 743 {
 744         struct cpmac_priv *priv = netdev_priv(dev);
 745
 746         if (!capable(CAP_NET_ADMIN))
 747                 return -EPERM;
 748
 749         if (priv->phy)
 750                 return phy_ethtool_sset(priv->phy, cmd);
 751
 752         return -EINVAL;
 753 }
 754
 755 static void cpmac_get_drvinfo(struct net_device *dev,
 756                               struct ethtool_drvinfo *info)
 757 {
 758         strcpy(info->driver, "cpmac");
 759         strcpy(info->version, "0.0.3");
 760         info->fw_version[0] = '\0';
 761         sprintf(info->bus_info, "%s", "cpmac");
 762         info->regdump_len = 0;
 763 }
 764
 765 static const struct ethtool_ops cpmac_ethtool_ops = {
 766         .get_settings = cpmac_get_settings,
 767         .set_settings = cpmac_set_settings,
 768         .get_drvinfo = cpmac_get_drvinfo,
 769         .get_link = ethtool_op_get_link,
 770 };
 771
 772 static struct net_device_stats *cpmac_stats(struct net_device *dev)
 773 {
 774         struct cpmac_priv *priv = netdev_priv(dev);
 775
 776         if (netif_device_present(dev))
 777                 return &priv->stats;
 778
 779         return NULL;
 780 }
 781
 782 static int cpmac_change_mtu(struct net_device *dev, int mtu)
 783 {
 784         unsigned long flags;
 785         struct cpmac_priv *priv = netdev_priv(dev);
 786         spinlock_t *lock = &priv->lock;
 787
 788         if ((mtu < 68) || (mtu > 1500))
 789                 return -EINVAL;
 790
 791         spin_lock_irqsave(lock, flags);
 792         dev->mtu = mtu;
 793         spin_unlock_irqrestore(lock, flags);
 794
 795         return 0;
 796 }
 797
 798 static void cpmac_adjust_link(struct net_device *dev)
 799 {
 800         struct cpmac_priv *priv = netdev_priv(dev);
 801         unsigned long flags;
 802         int new_state = 0;
 803
 804         spin_lock_irqsave(&priv->lock, flags);
 805         if (priv->phy->link) {
 806                 if (priv->phy->duplex != priv->oldduplex) {
 807                         new_state = 1;
 808                         priv->oldduplex = priv->phy->duplex;
 809                 }
 810
 811                 if (priv->phy->speed != priv->oldspeed) {
 812                         new_state = 1;
 813                         priv->oldspeed = priv->phy->speed;
 814                 }
 815
 816                 if (!priv->oldlink) {
 817                         new_state = 1;
 818                         priv->oldlink = 1;
 819                         netif_schedule(dev);
 820                 }
 821         } else if (priv->oldlink) {
 822                 new_state = 1;
 823                 priv->oldlink = 0;
 824                 priv->oldspeed = 0;
 825                 priv->oldduplex = -1;
 826         }
 827
 828         if (new_state)
 829                 phy_print_status(priv->phy);
 830
 831         spin_unlock_irqrestore(&priv->lock, flags);
 832 }
 833
 834 static void cpmac_hw_init(struct net_device *dev)
 835 {
 836         int i;
 837         struct cpmac_priv *priv = netdev_priv(dev);
 838
 839         for (i = 0; i < 8; i++)
 840                 priv->regs->tx_ptr[i] = 0;
 841         priv->regs->rx_ptr[0] = virt_to_phys(priv->rx_head);
 842
 843         priv->regs->mbp = MBP_RXSHORT | MBP_RXBCAST | MBP_RXMCAST;
 844         priv->regs->unicast_enable = 0x1;
 845         priv->regs->unicast_clear = 0xfe;
 846         priv->regs->buffer_offset = 0;
 847         for (i = 0; i < 8; i++)
 848                 priv->regs->mac_addr_low[i] = dev->dev_addr[5];
 849         priv->regs->mac_addr_mid = dev->dev_addr[4];
 850         priv->regs->mac_addr_high = dev->dev_addr[0] | (dev->dev_addr[1] << 8)
 851                 | (dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
 852         priv->regs->max_len = CPMAC_SKB_SIZE;
 853         priv->regs->rx_int.enable = 0x1;
 854         priv->regs->rx_int.clear = 0xfe;
 855         priv->regs->tx_int.enable = 0xff;
 856         priv->regs->tx_int.clear = 0;
 857         priv->regs->mac_int_enable = 3;
 858         priv->regs->mac_int_clear = 0xfc;
 859
 860         priv->regs->rx_ctrl.control |= 1;
 861         priv->regs->tx_ctrl.control |= 1;
 862         priv->regs->mac_control |= MAC_MII | MAC_FDX;
 863
 864         priv->phy->state = PHY_CHANGELINK;
 865         phy_start(priv->phy);
 866 }
 867
 868 static int cpmac_open(struct net_device *dev)
 869 {
 870         int i, size, res;
 871         struct cpmac_priv *priv = netdev_priv(dev);
 872         struct cpmac_desc *desc;
 873         struct sk_buff *skb;
 874
 875 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 876         priv->phy = phy_connect(dev, priv->phy_name, &cpmac_adjust_link,
 877                                 0, PHY_INTERFACE_MODE_MII);
 878 #else
 879         priv->phy = phy_connect(dev, priv->phy_name, &cpmac_adjust_link, 0);
 880 #endif
 881         if (IS_ERR(priv->phy)) {
 882                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 883                 return PTR_ERR(priv->phy);
 884         }
 885
 886         if (!request_mem_region(dev->mem_start, dev->mem_end -
 887                                 dev->mem_start, dev->name)) {
 888                 printk("%s: failed to request registers\n",
 889                        dev->name);
 890                 res = -ENXIO;
 891                 goto fail_reserve;
 892         }
 893
 894         priv->regs = ioremap_nocache(dev->mem_start, dev->mem_end -
 895                                      dev->mem_start);
 896         if (!priv->regs) {
 897                 printk("%s: failed to remap registers\n", dev->name);
 898                 res = -ENXIO;
 899                 goto fail_remap;
 900         }
 901
 902         priv->rx_head = NULL;
 903         size = sizeof(struct cpmac_desc) * (rx_ring_size +
 904                                             CPMAC_TX_RING_SIZE);
 905         priv->desc_ring = (struct cpmac_desc *)kmalloc(size, GFP_KERNEL);
 906         if (!priv->desc_ring) {
 907                 res = -ENOMEM;
 908                 goto fail_alloc;
 909         }
 910
 911         memset((char *)priv->desc_ring, 0, size);
 912
 913         priv->skb_pool = NULL;
 914         priv->free_skbs = 0;
 915         priv->rx_head = &priv->desc_ring[CPMAC_TX_RING_SIZE];
 916
 917 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 918         INIT_WORK(&priv->alloc_work, cpmac_alloc_skbs);
 919 #else
 920         INIT_WORK(&priv->alloc_work, cpmac_alloc_skbs, dev);
 921 #endif
 922         schedule_work(&priv->alloc_work);
 923         flush_scheduled_work();
 924
 925         for (i = 0; i < rx_ring_size; i++) {
 926                 desc = &priv->rx_head[i];
 927                 skb = cpmac_get_skb(dev);
 928                 if (!skb) {
 929                         res = -ENOMEM;
 930                         goto fail_desc;
 931                 }
 932                 desc->skb = skb;
 933                 desc->hw_data = virt_to_phys(skb->data);
 934                 desc->buflen = CPMAC_SKB_SIZE;
 935                 desc->dataflags = CPMAC_OWN;
 936                 desc->next = &priv->rx_head[(i + 1) % rx_ring_size];
 937                 desc->hw_next = virt_to_phys(desc->next);
 938                 dma_cache_wback((u32)desc, 16);
 939         }
 940
 941         if((res = request_irq(dev->irq, cpmac_irq, SA_INTERRUPT,
 942                               dev->name, dev))) {
 943                 printk("%s: failed to obtain irq\n", dev->name);
 944                 goto fail_irq;
 945         }
 946
 947         cpmac_reset(dev);
 948         cpmac_hw_init(dev);
 949
 950         netif_start_queue(dev);
 951         return 0;
 952
 953 fail_irq:
 954 fail_desc:
 955         for (i = 0; i < rx_ring_size; i++)
 956                 if (priv->rx_head[i].skb)
 957                         kfree_skb(priv->rx_head[i].skb);
 958 fail_alloc:
 959         kfree(priv->desc_ring);
 960
 961         for (skb = priv->skb_pool; skb; skb = priv->skb_pool) {
 962                 priv->skb_pool = skb->next;
 963                 kfree_skb(skb);
 964         }
 965
 966         iounmap(priv->regs);
 967
 968 fail_remap:
 969         release_mem_region(dev->mem_start, dev->mem_end -
 970                            dev->mem_start);
 971
 972 fail_reserve:
 973         phy_disconnect(priv->phy);
 974
 975         return res;
 976 }
 977
 978 static int cpmac_stop(struct net_device *dev)
 979 {
 980         int i;
 981         struct sk_buff *skb;
 982         struct cpmac_priv *priv = netdev_priv(dev);
 983
 984         netif_stop_queue(dev);
 985
 986         phy_stop(priv->phy);
 987         phy_disconnect(priv->phy);
 988         priv->phy = NULL;
 989
 990         cpmac_reset(dev);
 991
 992         for (i = 0; i < 8; i++) {
 993                 priv->regs->rx_ptr[i] = 0;
 994                 priv->regs->tx_ptr[i] = 0;
 995                 priv->regs->mbp = 0;
 996         }
 997
 998         free_irq(dev->irq, dev);
 999         release_mem_region(dev->mem_start, dev->mem_end -
1000                            dev->mem_start);
1001
1002         cancel_delayed_work(&priv->alloc_work);
1003         flush_scheduled_work();
1004
1005         priv->rx_head = &priv->desc_ring[CPMAC_TX_RING_SIZE];
1006         for (i = 0; i < rx_ring_size; i++)
1007                 if (priv->rx_head[i].skb)
1008                         kfree_skb(priv->rx_head[i].skb);
1009
1010         kfree(priv->desc_ring);
1011
1012         for (skb = priv->skb_pool; skb; skb = priv->skb_pool) {
1013                 priv->skb_pool = skb->next;
1014                 kfree_skb(skb);
1015         }
1016
1017         return 0;
1018 }
1019
1020 static int external_switch = 0;
1021
1022 static int __devinit cpmac_probe(struct platform_device *pdev)
1023 {
1024         int i, rc, phy_id;
1025         struct resource *res;
1026         struct cpmac_priv *priv;
1027         struct net_device *dev;
1028         struct plat_cpmac_data *pdata;
1029
1030         if (strcmp(pdev->name, "cpmac") != 0)
1031                 return -ENODEV;
1032
1033         pdata = pdev->dev.platform_data;
1034
1035         for (phy_id = 0; phy_id < PHY_MAX_ADDR; phy_id++) {
1036                 if (!(pdata->phy_mask & (1 << phy_id)))
1037                         continue;
1038                 if (!cpmac_mii.phy_map[phy_id])
1039                         continue;
1040                 break;
1041         }
1042
1043         if (phy_id == PHY_MAX_ADDR) {
1044                 if (external_switch) {
1045                         phy_id = 0;
1046                 } else {
1047                         printk("cpmac: no PHY present\n");
1048                         return -ENODEV;
1049                 }
1050         }
1051
1052         dev = alloc_etherdev(sizeof(struct cpmac_priv));
1053
1054         if (!dev) {
1055                 printk(KERN_ERR "cpmac: Unable to allocate net_device structure!\n");
1056                 return -ENOMEM;
1057         }
1058
1059         SET_MODULE_OWNER(dev);
1060         platform_set_drvdata(pdev, dev);
1061         priv = netdev_priv(dev);
1062
1063         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
1064         if (!res) {
1065                 rc = -ENODEV;
1066                 goto fail;
1067         }
1068
1069         dev->mem_start = res->start;
1070         dev->mem_end = res->end;
1071         dev->irq = platform_get_irq_byname(pdev, "irq");
1072
1073         dev->mtu                = 1500;
1074         dev->open               = cpmac_open;
1075         dev->stop               = cpmac_stop;
1076         dev->set_config         = cpmac_config;
1077         dev->hard_start_xmit    = cpmac_start_xmit;
1078         dev->do_ioctl           = cpmac_ioctl;
1079         dev->get_stats          = cpmac_stats;
1080         dev->change_mtu         = cpmac_change_mtu;
1081         dev->set_mac_address    = cpmac_set_mac_address;
1082         dev->set_multicast_list = cpmac_set_multicast_list;
1083         dev->tx_timeout         = cpmac_tx_timeout;
1084         dev->ethtool_ops        = &cpmac_ethtool_ops;
1085         if (!disable_napi) {
1086                 dev->poll = cpmac_poll;
1087                 dev->weight = min(rx_ring_size, 64);
1088         }
1089
1090         memset(priv, 0, sizeof(struct cpmac_priv));
1091         spin_lock_init(&priv->lock);
1092         priv->msg_enable = netif_msg_init(NETIF_MSG_WOL, 0x3fff);
1093         priv->config = pdata;
1094         priv->dev = dev;
1095         memcpy(dev->dev_addr, priv->config->dev_addr, sizeof(dev->dev_addr));
1096         if (phy_id == 31) {
1097                 snprintf(priv->phy_name, BUS_ID_SIZE, PHY_ID_FMT,
1098                          cpmac_mii.id, phy_id);
1099         } else {
1100                 snprintf(priv->phy_name, BUS_ID_SIZE, "fixed@%d:%d", 100, 1);
1101         }
1102
1103         if ((rc = register_netdev(dev))) {
1104                 printk("cpmac: error %i registering device %s\n",
1105                        rc, dev->name);
1106                 goto fail;
1107         }
1108
1109         printk("cpmac: device %s (regs: %p, irq: %d, phy: %s, mac: ",
1110                dev->name, (u32 *)dev->mem_start, dev->irq,
1111                priv->phy_name);
1112         for (i = 0; i < 6; i++) {
1113                 printk("%02x", dev->dev_addr[i]);
1114                 if (i < 5) printk(":");
1115                 else printk(")\n");
1116         }
1117
1118         return 0;
1119
1120 fail:
1121         free_netdev(dev);
1122         return rc;
1123 }
1124
1125 static int __devexit cpmac_remove(struct platform_device *pdev)
1126 {
1127         struct net_device *dev = platform_get_drvdata(pdev);
1128         unregister_netdev(dev);
1129         free_netdev(dev);
1130         return 0;
1131 }
1132
1133 static struct platform_driver cpmac_driver = {
1134         .driver.name = "cpmac",
1135         .probe = cpmac_probe,
1136         .remove = cpmac_remove,
1137 };
1138
1139 int __devinit cpmac_init(void)
1140 {
1141         volatile u32 mask;
1142         int i, res;
1143         cpmac_mii.priv = (struct cpmac_mdio_regs *)
1144                 ioremap_nocache(AR7_REGS_MDIO, sizeof(struct cpmac_mdio_regs));
1145
1146         if (!cpmac_mii.priv) {
1147                 printk("Can't ioremap mdio registers\n");
1148                 return -ENXIO;
1149         }
1150
1151 #warning FIXME: unhardcode gpio&reset bits
1152         ar7_gpio_disable(26);
1153         ar7_gpio_disable(27);
1154         ar7_device_reset(17);
1155         ar7_device_reset(21);
1156         ar7_device_reset(26);
1157
1158         cpmac_mii.reset(&cpmac_mii);
1159
1160         for (i = 0; i < 300000; i++) {
1161                 mask = ((struct cpmac_mdio_regs *)cpmac_mii.priv)->alive;
1162                 if (mask)
1163                         break;
1164         }
1165
1166         mask &= 0x7fffffff;
1167         if (mask & (mask - 1)) {
1168                 external_switch = 1;
1169                 mask = 0;
1170         }
1171
1172         cpmac_mii.phy_mask = ~(mask | 0x80000000);
1173
1174         res = mdiobus_register(&cpmac_mii);
1175         if (res)
1176                 goto fail_mii;
1177
1178         res = platform_driver_register(&cpmac_driver);
1179         if (res)
1180                 goto fail_cpmac;
1181
1182         return 0;
1183
1184 fail_cpmac:
1185         mdiobus_unregister(&cpmac_mii);
1186
1187 fail_mii:
1188         iounmap(cpmac_mii.priv);
1189
1190         return res;
1191 }
1192
1193 void __devexit cpmac_exit(void)
1194 {
1195         platform_driver_unregister(&cpmac_driver);
1196         mdiobus_unregister(&cpmac_mii);
1197 }
1198
1199 module_init(cpmac_init);
1200 module_exit(cpmac_exit);