git.oblomov.eu Git - linux-2.6/blob - drivers/net/bfin_mac.c

   1 /*
   2  * Blackfin On-Chip MAC Driver
   3  *
   4  * Copyright 2004-2007 Analog Devices Inc.
   5  *
   6  * Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/sched.h>
  15 #include <linux/slab.h>
  16 #include <linux/delay.h>
  17 #include <linux/timer.h>
  18 #include <linux/errno.h>
  19 #include <linux/irq.h>
  20 #include <linux/io.h>
  21 #include <linux/ioport.h>
  22 #include <linux/crc32.h>
  23 #include <linux/device.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/ethtool.h>
  26 #include <linux/mii.h>
  27 #include <linux/phy.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/platform_device.h>
  32
  33 #include <asm/dma.h>
  34 #include <linux/dma-mapping.h>
  35
  36 #include <asm/blackfin.h>
  37 #include <asm/cacheflush.h>
  38 #include <asm/portmux.h>
  39
  40 #include "bfin_mac.h"
  41
  42 #define DRV_NAME        "bfin_mac"
  43 #define DRV_VERSION     "1.1"
  44 #define DRV_AUTHOR      "Bryan Wu, Luke Yang"
  45 #define DRV_DESC        "Blackfin BF53[67] BF527 on-chip Ethernet MAC driver"
  46
  47 MODULE_AUTHOR(DRV_AUTHOR);
  48 MODULE_LICENSE("GPL");
  49 MODULE_DESCRIPTION(DRV_DESC);
  50 MODULE_ALIAS("platform:bfin_mac");
  51
  52 #if defined(CONFIG_BFIN_MAC_USE_L1)
  53 # define bfin_mac_alloc(dma_handle, size)  l1_data_sram_zalloc(size)
  54 # define bfin_mac_free(dma_handle, ptr)    l1_data_sram_free(ptr)
  55 #else
  56 # define bfin_mac_alloc(dma_handle, size) \
  57         dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL)
  58 # define bfin_mac_free(dma_handle, ptr) \
  59         dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
  60 #endif
  61
  62 #define PKT_BUF_SZ 1580
  63
  64 #define MAX_TIMEOUT_CNT 500
  65
  66 /* pointers to maintain transmit list */
  67 static struct net_dma_desc_tx *tx_list_head;
  68 static struct net_dma_desc_tx *tx_list_tail;
  69 static struct net_dma_desc_rx *rx_list_head;
  70 static struct net_dma_desc_rx *rx_list_tail;
  71 static struct net_dma_desc_rx *current_rx_ptr;
  72 static struct net_dma_desc_tx *current_tx_ptr;
  73 static struct net_dma_desc_tx *tx_desc;
  74 static struct net_dma_desc_rx *rx_desc;
  75
  76 static void bf537mac_disable(void);
  77 static void bf537mac_enable(void);
  78
  79 static void desc_list_free(void)
  80 {
  81         struct net_dma_desc_rx *r;
  82         struct net_dma_desc_tx *t;
  83         int i;
  84 #if !defined(CONFIG_BFIN_MAC_USE_L1)
  85         dma_addr_t dma_handle = 0;
  86 #endif
  87
  88         if (tx_desc) {
  89                 t = tx_list_head;
  90                 for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
  91                         if (t) {
  92                                 if (t->skb) {
  93                                         dev_kfree_skb(t->skb);
  94                                         t->skb = NULL;
  95                                 }
  96                                 t = t->next;
  97                         }
  98                 }
  99                 bfin_mac_free(dma_handle, tx_desc);
 100         }
 101
 102         if (rx_desc) {
 103                 r = rx_list_head;
 104                 for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
 105                         if (r) {
 106                                 if (r->skb) {
 107                                         dev_kfree_skb(r->skb);
 108                                         r->skb = NULL;
 109                                 }
 110                                 r = r->next;
 111                         }
 112                 }
 113                 bfin_mac_free(dma_handle, rx_desc);
 114         }
 115 }
 116
 117 static int desc_list_init(void)
 118 {
 119         int i;
 120         struct sk_buff *new_skb;
 121 #if !defined(CONFIG_BFIN_MAC_USE_L1)
 122         /*
 123          * This dma_handle is useless in Blackfin dma_alloc_coherent().
 124          * The real dma handler is the return value of dma_alloc_coherent().
 125          */
 126         dma_addr_t dma_handle;
 127 #endif
 128
 129         tx_desc = bfin_mac_alloc(&dma_handle,
 130                                 sizeof(struct net_dma_desc_tx) *
 131                                 CONFIG_BFIN_TX_DESC_NUM);
 132         if (tx_desc == NULL)
 133                 goto init_error;
 134
 135         rx_desc = bfin_mac_alloc(&dma_handle,
 136                                 sizeof(struct net_dma_desc_rx) *
 137                                 CONFIG_BFIN_RX_DESC_NUM);
 138         if (rx_desc == NULL)
 139                 goto init_error;
 140
 141         /* init tx_list */
 142         tx_list_head = tx_list_tail = tx_desc;
 143
 144         for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
 145                 struct net_dma_desc_tx *t = tx_desc + i;
 146                 struct dma_descriptor *a = &(t->desc_a);
 147                 struct dma_descriptor *b = &(t->desc_b);
 148
 149                 /*
 150                  * disable DMA
 151                  * read from memory WNR = 0
 152                  * wordsize is 32 bits
 153                  * 6 half words is desc size
 154                  * large desc flow
 155                  */
 156                 a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
 157                 a->start_addr = (unsigned long)t->packet;
 158                 a->x_count = 0;
 159                 a->next_dma_desc = b;
 160
 161                 /*
 162                  * enabled DMA
 163                  * write to memory WNR = 1
 164                  * wordsize is 32 bits
 165                  * disable interrupt
 166                  * 6 half words is desc size
 167                  * large desc flow
 168                  */
 169                 b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
 170                 b->start_addr = (unsigned long)(&(t->status));
 171                 b->x_count = 0;
 172
 173                 t->skb = NULL;
 174                 tx_list_tail->desc_b.next_dma_desc = a;
 175                 tx_list_tail->next = t;
 176                 tx_list_tail = t;
 177         }
 178         tx_list_tail->next = tx_list_head;      /* tx_list is a circle */
 179         tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
 180         current_tx_ptr = tx_list_head;
 181
 182         /* init rx_list */
 183         rx_list_head = rx_list_tail = rx_desc;
 184
 185         for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
 186                 struct net_dma_desc_rx *r = rx_desc + i;
 187                 struct dma_descriptor *a = &(r->desc_a);
 188                 struct dma_descriptor *b = &(r->desc_b);
 189
 190                 /* allocate a new skb for next time receive */
 191                 new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
 192                 if (!new_skb) {
 193                         printk(KERN_NOTICE DRV_NAME
 194                                ": init: low on mem - packet dropped\n");
 195                         goto init_error;
 196                 }
 197                 skb_reserve(new_skb, 2);
 198                 r->skb = new_skb;
 199
 200                 /*
 201                  * enabled DMA
 202                  * write to memory WNR = 1
 203                  * wordsize is 32 bits
 204                  * disable interrupt
 205                  * 6 half words is desc size
 206                  * large desc flow
 207                  */
 208                 a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
 209                 /* since RXDWA is enabled */
 210                 a->start_addr = (unsigned long)new_skb->data - 2;
 211                 a->x_count = 0;
 212                 a->next_dma_desc = b;
 213
 214                 /*
 215                  * enabled DMA
 216                  * write to memory WNR = 1
 217                  * wordsize is 32 bits
 218                  * enable interrupt
 219                  * 6 half words is desc size
 220                  * large desc flow
 221                  */
 222                 b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
 223                                 NDSIZE_6 | DMAFLOW_LARGE;
 224                 b->start_addr = (unsigned long)(&(r->status));
 225                 b->x_count = 0;
 226
 227                 rx_list_tail->desc_b.next_dma_desc = a;
 228                 rx_list_tail->next = r;
 229                 rx_list_tail = r;
 230         }
 231         rx_list_tail->next = rx_list_head;      /* rx_list is a circle */
 232         rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
 233         current_rx_ptr = rx_list_head;
 234
 235         return 0;
 236
 237 init_error:
 238         desc_list_free();
 239         printk(KERN_ERR DRV_NAME ": kmalloc failed\n");
 240         return -ENOMEM;
 241 }
 242
 243
 244 /*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
 245
 246 /* Set FER regs to MUX in Ethernet pins */
 247 static int setup_pin_mux(int action)
 248 {
 249 #if defined(CONFIG_BFIN_MAC_RMII)
 250         u16 pin_req[] = P_RMII0;
 251 #else
 252         u16 pin_req[] = P_MII0;
 253 #endif
 254
 255         if (action) {
 256                 if (peripheral_request_list(pin_req, DRV_NAME)) {
 257                         printk(KERN_ERR DRV_NAME
 258                         ": Requesting Peripherals failed\n");
 259                         return -EFAULT;
 260                 }
 261         } else
 262                 peripheral_free_list(pin_req);
 263
 264         return 0;
 265 }
 266
 267 /*
 268  * MII operations
 269  */
 270 /* Wait until the previous MDC/MDIO transaction has completed */
 271 static void mdio_poll(void)
 272 {
 273         int timeout_cnt = MAX_TIMEOUT_CNT;
 274
 275         /* poll the STABUSY bit */
 276         while ((bfin_read_EMAC_STAADD()) & STABUSY) {
 277                 udelay(1);
 278                 if (timeout_cnt-- < 0) {
 279                         printk(KERN_ERR DRV_NAME
 280                         ": wait MDC/MDIO transaction to complete timeout\n");
 281                         break;
 282                 }
 283         }
 284 }
 285
 286 /* Read an off-chip register in a PHY through the MDC/MDIO port */
 287 static int mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
 288 {
 289         mdio_poll();
 290
 291         /* read mode */
 292         bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
 293                                 SET_REGAD((u16) regnum) |
 294                                 STABUSY);
 295
 296         mdio_poll();
 297
 298         return (int) bfin_read_EMAC_STADAT();
 299 }
 300
 301 /* Write an off-chip register in a PHY through the MDC/MDIO port */
 302 static int mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
 303                          u16 value)
 304 {
 305         mdio_poll();
 306
 307         bfin_write_EMAC_STADAT((u32) value);
 308
 309         /* write mode */
 310         bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
 311                                 SET_REGAD((u16) regnum) |
 312                                 STAOP |
 313                                 STABUSY);
 314
 315         mdio_poll();
 316
 317         return 0;
 318 }
 319
 320 static int mdiobus_reset(struct mii_bus *bus)
 321 {
 322         return 0;
 323 }
 324
 325 static void bf537_adjust_link(struct net_device *dev)
 326 {
 327         struct bf537mac_local *lp = netdev_priv(dev);
 328         struct phy_device *phydev = lp->phydev;
 329         unsigned long flags;
 330         int new_state = 0;
 331
 332         spin_lock_irqsave(&lp->lock, flags);
 333         if (phydev->link) {
 334                 /* Now we make sure that we can be in full duplex mode.
 335                  * If not, we operate in half-duplex mode. */
 336                 if (phydev->duplex != lp->old_duplex) {
 337                         u32 opmode = bfin_read_EMAC_OPMODE();
 338                         new_state = 1;
 339
 340                         if (phydev->duplex)
 341                                 opmode |= FDMODE;
 342                         else
 343                                 opmode &= ~(FDMODE);
 344
 345                         bfin_write_EMAC_OPMODE(opmode);
 346                         lp->old_duplex = phydev->duplex;
 347                 }
 348
 349                 if (phydev->speed != lp->old_speed) {
 350 #if defined(CONFIG_BFIN_MAC_RMII)
 351                         u32 opmode = bfin_read_EMAC_OPMODE();
 352                         switch (phydev->speed) {
 353                         case 10:
 354                                 opmode |= RMII_10;
 355                                 break;
 356                         case 100:
 357                                 opmode &= ~(RMII_10);
 358                                 break;
 359                         default:
 360                                 printk(KERN_WARNING
 361                                         "%s: Ack!  Speed (%d) is not 10/100!\n",
 362                                         DRV_NAME, phydev->speed);
 363                                 break;
 364                         }
 365                         bfin_write_EMAC_OPMODE(opmode);
 366 #endif
 367
 368                         new_state = 1;
 369                         lp->old_speed = phydev->speed;
 370                 }
 371
 372                 if (!lp->old_link) {
 373                         new_state = 1;
 374                         lp->old_link = 1;
 375                         netif_schedule(dev);
 376                 }
 377         } else if (lp->old_link) {
 378                 new_state = 1;
 379                 lp->old_link = 0;
 380                 lp->old_speed = 0;
 381                 lp->old_duplex = -1;
 382         }
 383
 384         if (new_state) {
 385                 u32 opmode = bfin_read_EMAC_OPMODE();
 386                 phy_print_status(phydev);
 387                 pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
 388         }
 389
 390         spin_unlock_irqrestore(&lp->lock, flags);
 391 }
 392
 393 /* MDC  = 2.5 MHz */
 394 #define MDC_CLK 2500000
 395
 396 static int mii_probe(struct net_device *dev)
 397 {
 398         struct bf537mac_local *lp = netdev_priv(dev);
 399         struct phy_device *phydev = NULL;
 400         unsigned short sysctl;
 401         int i;
 402         u32 sclk, mdc_div;
 403
 404         /* Enable PHY output early */
 405         if (!(bfin_read_VR_CTL() & PHYCLKOE))
 406                 bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
 407
 408         sclk = get_sclk();
 409         mdc_div = ((sclk / MDC_CLK) / 2) - 1;
 410
 411         sysctl = bfin_read_EMAC_SYSCTL();
 412         sysctl = (sysctl & ~MDCDIV) | SET_MDCDIV(mdc_div);
 413         bfin_write_EMAC_SYSCTL(sysctl);
 414
 415         /* search for connect PHY device */
 416         for (i = 0; i < PHY_MAX_ADDR; i++) {
 417                 struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i];
 418
 419                 if (!tmp_phydev)
 420                         continue; /* no PHY here... */
 421
 422                 phydev = tmp_phydev;
 423                 break; /* found it */
 424         }
 425
 426         /* now we are supposed to have a proper phydev, to attach to... */
 427         if (!phydev) {
 428                 printk(KERN_INFO "%s: Don't found any phy device at all\n",
 429                         dev->name);
 430                 return -ENODEV;
 431         }
 432
 433 #if defined(CONFIG_BFIN_MAC_RMII)
 434         phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
 435                         PHY_INTERFACE_MODE_RMII);
 436 #else
 437         phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
 438                         PHY_INTERFACE_MODE_MII);
 439 #endif
 440
 441         if (IS_ERR(phydev)) {
 442                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 443                 return PTR_ERR(phydev);
 444         }
 445
 446         /* mask with MAC supported features */
 447         phydev->supported &= (SUPPORTED_10baseT_Half
 448                               | SUPPORTED_10baseT_Full
 449                               | SUPPORTED_100baseT_Half
 450                               | SUPPORTED_100baseT_Full
 451                               | SUPPORTED_Autoneg
 452                               | SUPPORTED_Pause | SUPPORTED_Asym_Pause
 453                               | SUPPORTED_MII
 454                               | SUPPORTED_TP);
 455
 456         phydev->advertising = phydev->supported;
 457
 458         lp->old_link = 0;
 459         lp->old_speed = 0;
 460         lp->old_duplex = -1;
 461         lp->phydev = phydev;
 462
 463         printk(KERN_INFO "%s: attached PHY driver [%s] "
 464                "(mii_bus:phy_addr=%s, irq=%d, mdc_clk=%dHz(mdc_div=%d)"
 465                "@sclk=%dMHz)\n",
 466                DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq,
 467                MDC_CLK, mdc_div, sclk/1000000);
 468
 469         return 0;
 470 }
 471
 472 /**************************************************************************/
 473 void setup_system_regs(struct net_device *dev)
 474 {
 475         unsigned short sysctl;
 476
 477         /*
 478          * Odd word alignment for Receive Frame DMA word
 479          * Configure checksum support and rcve frame word alignment
 480          */
 481         sysctl = bfin_read_EMAC_SYSCTL();
 482 #if defined(BFIN_MAC_CSUM_OFFLOAD)
 483         sysctl |= RXDWA | RXCKS;
 484 #else
 485         sysctl |= RXDWA;
 486 #endif
 487         bfin_write_EMAC_SYSCTL(sysctl);
 488
 489         bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
 490
 491         /* Initialize the TX DMA channel registers */
 492         bfin_write_DMA2_X_COUNT(0);
 493         bfin_write_DMA2_X_MODIFY(4);
 494         bfin_write_DMA2_Y_COUNT(0);
 495         bfin_write_DMA2_Y_MODIFY(0);
 496
 497         /* Initialize the RX DMA channel registers */
 498         bfin_write_DMA1_X_COUNT(0);
 499         bfin_write_DMA1_X_MODIFY(4);
 500         bfin_write_DMA1_Y_COUNT(0);
 501         bfin_write_DMA1_Y_MODIFY(0);
 502 }
 503
 504 static void setup_mac_addr(u8 *mac_addr)
 505 {
 506         u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
 507         u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
 508
 509         /* this depends on a little-endian machine */
 510         bfin_write_EMAC_ADDRLO(addr_low);
 511         bfin_write_EMAC_ADDRHI(addr_hi);
 512 }
 513
 514 static int bf537mac_set_mac_address(struct net_device *dev, void *p)
 515 {
 516         struct sockaddr *addr = p;
 517         if (netif_running(dev))
 518                 return -EBUSY;
 519         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 520         setup_mac_addr(dev->dev_addr);
 521         return 0;
 522 }
 523
 524 static void adjust_tx_list(void)
 525 {
 526         int timeout_cnt = MAX_TIMEOUT_CNT;
 527
 528         if (tx_list_head->status.status_word != 0
 529             && current_tx_ptr != tx_list_head) {
 530                 goto adjust_head;       /* released something, just return; */
 531         }
 532
 533         /*
 534          * if nothing released, check wait condition
 535          * current's next can not be the head,
 536          * otherwise the dma will not stop as we want
 537          */
 538         if (current_tx_ptr->next->next == tx_list_head) {
 539                 while (tx_list_head->status.status_word == 0) {
 540                         mdelay(1);
 541                         if (tx_list_head->status.status_word != 0
 542                             || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
 543                                 goto adjust_head;
 544                         }
 545                         if (timeout_cnt-- < 0) {
 546                                 printk(KERN_ERR DRV_NAME
 547                                 ": wait for adjust tx list head timeout\n");
 548                                 break;
 549                         }
 550                 }
 551                 if (tx_list_head->status.status_word != 0) {
 552                         goto adjust_head;
 553                 }
 554         }
 555
 556         return;
 557
 558 adjust_head:
 559         do {
 560                 tx_list_head->desc_a.config &= ~DMAEN;
 561                 tx_list_head->status.status_word = 0;
 562                 if (tx_list_head->skb) {
 563                         dev_kfree_skb(tx_list_head->skb);
 564                         tx_list_head->skb = NULL;
 565                 } else {
 566                         printk(KERN_ERR DRV_NAME
 567                                ": no sk_buff in a transmitted frame!\n");
 568                 }
 569                 tx_list_head = tx_list_head->next;
 570         } while (tx_list_head->status.status_word != 0
 571                  && current_tx_ptr != tx_list_head);
 572         return;
 573
 574 }
 575
 576 static int bf537mac_hard_start_xmit(struct sk_buff *skb,
 577                                 struct net_device *dev)
 578 {
 579         unsigned int data;
 580
 581         current_tx_ptr->skb = skb;
 582
 583         /*
 584          * Is skb->data always 16-bit aligned?
 585          * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
 586          */
 587         if ((((unsigned int)(skb->data)) & 0x02) == 2) {
 588                 /* move skb->data to current_tx_ptr payload */
 589                 data = (unsigned int)(skb->data) - 2;
 590                 *((unsigned short *)data) = (unsigned short)(skb->len);
 591                 current_tx_ptr->desc_a.start_addr = (unsigned long)data;
 592                 /* this is important! */
 593                 blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
 594
 595         } else {
 596                 *((unsigned short *)(current_tx_ptr->packet)) =
 597                     (unsigned short)(skb->len);
 598                 memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
 599                        (skb->len));
 600                 current_tx_ptr->desc_a.start_addr =
 601                     (unsigned long)current_tx_ptr->packet;
 602                 if (current_tx_ptr->status.status_word != 0)
 603                         current_tx_ptr->status.status_word = 0;
 604                 blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
 605                                             packet,
 606                                             (unsigned int)(current_tx_ptr->
 607                                                            packet + skb->len) +
 608                                             2);
 609         }
 610
 611         /* enable this packet's dma */
 612         current_tx_ptr->desc_a.config |= DMAEN;
 613
 614         /* tx dma is running, just return */
 615         if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
 616                 goto out;
 617
 618         /* tx dma is not running */
 619         bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
 620         /* dma enabled, read from memory, size is 6 */
 621         bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
 622         /* Turn on the EMAC tx */
 623         bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
 624
 625 out:
 626         adjust_tx_list();
 627         current_tx_ptr = current_tx_ptr->next;
 628         dev->trans_start = jiffies;
 629         dev->stats.tx_packets++;
 630         dev->stats.tx_bytes += (skb->len);
 631         return 0;
 632 }
 633
 634 static void bf537mac_rx(struct net_device *dev)
 635 {
 636         struct sk_buff *skb, *new_skb;
 637         unsigned short len;
 638
 639         /* allocate a new skb for next time receive */
 640         skb = current_rx_ptr->skb;
 641         new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
 642         if (!new_skb) {
 643                 printk(KERN_NOTICE DRV_NAME
 644                        ": rx: low on mem - packet dropped\n");
 645                 dev->stats.rx_dropped++;
 646                 goto out;
 647         }
 648         /* reserve 2 bytes for RXDWA padding */
 649         skb_reserve(new_skb, 2);
 650         current_rx_ptr->skb = new_skb;
 651         current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
 652
 653         /* Invidate the data cache of skb->data range when it is write back
 654          * cache. It will prevent overwritting the new data from DMA
 655          */
 656         blackfin_dcache_invalidate_range((unsigned long)new_skb->head,
 657                                          (unsigned long)new_skb->end);
 658
 659         len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
 660         skb_put(skb, len);
 661         blackfin_dcache_invalidate_range((unsigned long)skb->head,
 662                                          (unsigned long)skb->tail);
 663
 664         dev->last_rx = jiffies;
 665         skb->dev = dev;
 666         skb->protocol = eth_type_trans(skb, dev);
 667 #if defined(BFIN_MAC_CSUM_OFFLOAD)
 668         skb->csum = current_rx_ptr->status.ip_payload_csum;
 669         skb->ip_summed = CHECKSUM_COMPLETE;
 670 #endif
 671
 672         netif_rx(skb);
 673         dev->stats.rx_packets++;
 674         dev->stats.rx_bytes += len;
 675         current_rx_ptr->status.status_word = 0x00000000;
 676         current_rx_ptr = current_rx_ptr->next;
 677
 678 out:
 679         return;
 680 }
 681
 682 /* interrupt routine to handle rx and error signal */
 683 static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
 684 {
 685         struct net_device *dev = dev_id;
 686         int number = 0;
 687
 688 get_one_packet:
 689         if (current_rx_ptr->status.status_word == 0) {
 690                 /* no more new packet received */
 691                 if (number == 0) {
 692                         if (current_rx_ptr->next->status.status_word != 0) {
 693                                 current_rx_ptr = current_rx_ptr->next;
 694                                 goto real_rx;
 695                         }
 696                 }
 697                 bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
 698                                            DMA_DONE | DMA_ERR);
 699                 return IRQ_HANDLED;
 700         }
 701
 702 real_rx:
 703         bf537mac_rx(dev);
 704         number++;
 705         goto get_one_packet;
 706 }
 707
 708 #ifdef CONFIG_NET_POLL_CONTROLLER
 709 static void bf537mac_poll(struct net_device *dev)
 710 {
 711         disable_irq(IRQ_MAC_RX);
 712         bf537mac_interrupt(IRQ_MAC_RX, dev);
 713         enable_irq(IRQ_MAC_RX);
 714 }
 715 #endif                          /* CONFIG_NET_POLL_CONTROLLER */
 716
 717 static void bf537mac_disable(void)
 718 {
 719         unsigned int opmode;
 720
 721         opmode = bfin_read_EMAC_OPMODE();
 722         opmode &= (~RE);
 723         opmode &= (~TE);
 724         /* Turn off the EMAC */
 725         bfin_write_EMAC_OPMODE(opmode);
 726 }
 727
 728 /*
 729  * Enable Interrupts, Receive, and Transmit
 730  */
 731 static void bf537mac_enable(void)
 732 {
 733         u32 opmode;
 734
 735         pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__);
 736
 737         /* Set RX DMA */
 738         bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
 739         bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
 740
 741         /* Wait MII done */
 742         mdio_poll();
 743
 744         /* We enable only RX here */
 745         /* ASTP   : Enable Automatic Pad Stripping
 746            PR     : Promiscuous Mode for test
 747            PSF    : Receive frames with total length less than 64 bytes.
 748            FDMODE : Full Duplex Mode
 749            LB     : Internal Loopback for test
 750            RE     : Receiver Enable */
 751         opmode = bfin_read_EMAC_OPMODE();
 752         if (opmode & FDMODE)
 753                 opmode |= PSF;
 754         else
 755                 opmode |= DRO | DC | PSF;
 756         opmode |= RE;
 757
 758 #if defined(CONFIG_BFIN_MAC_RMII)
 759         opmode |= RMII; /* For Now only 100MBit are supported */
 760 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536)) && CONFIG_BF_REV_0_2
 761         opmode |= TE;
 762 #endif
 763 #endif
 764         /* Turn on the EMAC rx */
 765         bfin_write_EMAC_OPMODE(opmode);
 766 }
 767
 768 /* Our watchdog timed out. Called by the networking layer */
 769 static void bf537mac_timeout(struct net_device *dev)
 770 {
 771         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
 772
 773         bf537mac_disable();
 774
 775         /* reset tx queue */
 776         tx_list_tail = tx_list_head->next;
 777
 778         bf537mac_enable();
 779
 780         /* We can accept TX packets again */
 781         dev->trans_start = jiffies;
 782         netif_wake_queue(dev);
 783 }
 784
 785 static void bf537mac_multicast_hash(struct net_device *dev)
 786 {
 787         u32 emac_hashhi, emac_hashlo;
 788         struct dev_mc_list *dmi = dev->mc_list;
 789         char *addrs;
 790         int i;
 791         u32 crc;
 792
 793         emac_hashhi = emac_hashlo = 0;
 794
 795         for (i = 0; i < dev->mc_count; i++) {
 796                 addrs = dmi->dmi_addr;
 797                 dmi = dmi->next;
 798
 799                 /* skip non-multicast addresses */
 800                 if (!(*addrs & 1))
 801                         continue;
 802
 803                 crc = ether_crc(ETH_ALEN, addrs);
 804                 crc >>= 26;
 805
 806                 if (crc & 0x20)
 807                         emac_hashhi |= 1 << (crc & 0x1f);
 808                 else
 809                         emac_hashlo |= 1 << (crc & 0x1f);
 810         }
 811
 812         bfin_write_EMAC_HASHHI(emac_hashhi);
 813         bfin_write_EMAC_HASHLO(emac_hashlo);
 814
 815         return;
 816 }
 817
 818 /*
 819  * This routine will, depending on the values passed to it,
 820  * either make it accept multicast packets, go into
 821  * promiscuous mode (for TCPDUMP and cousins) or accept
 822  * a select set of multicast packets
 823  */
 824 static void bf537mac_set_multicast_list(struct net_device *dev)
 825 {
 826         u32 sysctl;
 827
 828         if (dev->flags & IFF_PROMISC) {
 829                 printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
 830                 sysctl = bfin_read_EMAC_OPMODE();
 831                 sysctl |= RAF;
 832                 bfin_write_EMAC_OPMODE(sysctl);
 833         } else if (dev->flags & IFF_ALLMULTI) {
 834                 /* accept all multicast */
 835                 sysctl = bfin_read_EMAC_OPMODE();
 836                 sysctl |= PAM;
 837                 bfin_write_EMAC_OPMODE(sysctl);
 838         } else if (dev->mc_count) {
 839                 /* set up multicast hash table */
 840                 sysctl = bfin_read_EMAC_OPMODE();
 841                 sysctl |= HM;
 842                 bfin_write_EMAC_OPMODE(sysctl);
 843                 bf537mac_multicast_hash(dev);
 844         } else {
 845                 /* clear promisc or multicast mode */
 846                 sysctl = bfin_read_EMAC_OPMODE();
 847                 sysctl &= ~(RAF | PAM);
 848                 bfin_write_EMAC_OPMODE(sysctl);
 849         }
 850 }
 851
 852 /*
 853  * this puts the device in an inactive state
 854  */
 855 static void bf537mac_shutdown(struct net_device *dev)
 856 {
 857         /* Turn off the EMAC */
 858         bfin_write_EMAC_OPMODE(0x00000000);
 859         /* Turn off the EMAC RX DMA */
 860         bfin_write_DMA1_CONFIG(0x0000);
 861         bfin_write_DMA2_CONFIG(0x0000);
 862 }
 863
 864 /*
 865  * Open and Initialize the interface
 866  *
 867  * Set up everything, reset the card, etc..
 868  */
 869 static int bf537mac_open(struct net_device *dev)
 870 {
 871         struct bf537mac_local *lp = netdev_priv(dev);
 872         int retval;
 873         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
 874
 875         /*
 876          * Check that the address is valid.  If its not, refuse
 877          * to bring the device up.  The user must specify an
 878          * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
 879          */
 880         if (!is_valid_ether_addr(dev->dev_addr)) {
 881                 printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
 882                 return -EINVAL;
 883         }
 884
 885         /* initial rx and tx list */
 886         retval = desc_list_init();
 887
 888         if (retval)
 889                 return retval;
 890
 891         phy_start(lp->phydev);
 892         phy_write(lp->phydev, MII_BMCR, BMCR_RESET);
 893         setup_system_regs(dev);
 894         bf537mac_disable();
 895         bf537mac_enable();
 896         pr_debug("hardware init finished\n");
 897         netif_start_queue(dev);
 898         netif_carrier_on(dev);
 899
 900         return 0;
 901 }
 902
 903 /*
 904  *
 905  * this makes the board clean up everything that it can
 906  * and not talk to the outside world.   Caused by
 907  * an 'ifconfig ethX down'
 908  */
 909 static int bf537mac_close(struct net_device *dev)
 910 {
 911         struct bf537mac_local *lp = netdev_priv(dev);
 912         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
 913
 914         netif_stop_queue(dev);
 915         netif_carrier_off(dev);
 916
 917         phy_stop(lp->phydev);
 918         phy_write(lp->phydev, MII_BMCR, BMCR_PDOWN);
 919
 920         /* clear everything */
 921         bf537mac_shutdown(dev);
 922
 923         /* free the rx/tx buffers */
 924         desc_list_free();
 925
 926         return 0;
 927 }
 928
 929 static int __init bf537mac_probe(struct net_device *dev)
 930 {
 931         struct bf537mac_local *lp = netdev_priv(dev);
 932         int retval;
 933         int i;
 934
 935         /* Grab the MAC address in the MAC */
 936         *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
 937         *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
 938
 939         /* probe mac */
 940         /*todo: how to proble? which is revision_register */
 941         bfin_write_EMAC_ADDRLO(0x12345678);
 942         if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
 943                 pr_debug("can't detect bf537 mac!\n");
 944                 retval = -ENODEV;
 945                 goto err_out;
 946         }
 947
 948         /* set the GPIO pins to Ethernet mode */
 949         retval = setup_pin_mux(1);
 950         if (retval)
 951                 return retval;
 952
 953         /*Is it valid? (Did bootloader initialize it?) */
 954         if (!is_valid_ether_addr(dev->dev_addr)) {
 955                 /* Grab the MAC from the board somehow - this is done in the
 956                    arch/blackfin/mach-bf537/boards/eth_mac.c */
 957                 bfin_get_ether_addr(dev->dev_addr);
 958         }
 959
 960         /* If still not valid, get a random one */
 961         if (!is_valid_ether_addr(dev->dev_addr)) {
 962                 random_ether_addr(dev->dev_addr);
 963         }
 964
 965         setup_mac_addr(dev->dev_addr);
 966
 967         /* MDIO bus initial */
 968         lp->mii_bus.priv = dev;
 969         lp->mii_bus.read = mdiobus_read;
 970         lp->mii_bus.write = mdiobus_write;
 971         lp->mii_bus.reset = mdiobus_reset;
 972         lp->mii_bus.name = "bfin_mac_mdio";
 973         snprintf(lp->mii_bus.id, MII_BUS_ID_SIZE, "0");
 974         lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
 975         for (i = 0; i < PHY_MAX_ADDR; ++i)
 976                 lp->mii_bus.irq[i] = PHY_POLL;
 977
 978         mdiobus_register(&lp->mii_bus);
 979
 980         retval = mii_probe(dev);
 981         if (retval)
 982                 return retval;
 983
 984         /* Fill in the fields of the device structure with ethernet values. */
 985         ether_setup(dev);
 986
 987         dev->open = bf537mac_open;
 988         dev->stop = bf537mac_close;
 989         dev->hard_start_xmit = bf537mac_hard_start_xmit;
 990         dev->set_mac_address = bf537mac_set_mac_address;
 991         dev->tx_timeout = bf537mac_timeout;
 992         dev->set_multicast_list = bf537mac_set_multicast_list;
 993 #ifdef CONFIG_NET_POLL_CONTROLLER
 994         dev->poll_controller = bf537mac_poll;
 995 #endif
 996
 997         spin_lock_init(&lp->lock);
 998
 999         /* now, enable interrupts */
1000         /* register irq handler */
1001         if (request_irq
1002             (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
1003              "EMAC_RX", dev)) {
1004                 printk(KERN_WARNING DRV_NAME
1005                        ": Unable to attach BlackFin MAC RX interrupt\n");
1006                 return -EBUSY;
1007         }
1008
1009
1010         retval = register_netdev(dev);
1011         if (retval == 0) {
1012                 /* now, print out the card info, in a short format.. */
1013                 printk(KERN_INFO "%s: Version %s, %s\n",
1014                          DRV_NAME, DRV_VERSION, DRV_DESC);
1015         }
1016
1017 err_out:
1018         return retval;
1019 }
1020
1021 static int bfin_mac_probe(struct platform_device *pdev)
1022 {
1023         struct net_device *ndev;
1024
1025         ndev = alloc_etherdev(sizeof(struct bf537mac_local));
1026         if (!ndev) {
1027                 printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
1028                 return -ENOMEM;
1029         }
1030
1031         SET_NETDEV_DEV(ndev, &pdev->dev);
1032
1033         platform_set_drvdata(pdev, ndev);
1034
1035         if (bf537mac_probe(ndev) != 0) {
1036                 platform_set_drvdata(pdev, NULL);
1037                 free_netdev(ndev);
1038                 printk(KERN_WARNING DRV_NAME ": not found\n");
1039                 return -ENODEV;
1040         }
1041
1042         return 0;
1043 }
1044
1045 static int bfin_mac_remove(struct platform_device *pdev)
1046 {
1047         struct net_device *ndev = platform_get_drvdata(pdev);
1048
1049         platform_set_drvdata(pdev, NULL);
1050
1051         unregister_netdev(ndev);
1052
1053         free_irq(IRQ_MAC_RX, ndev);
1054
1055         free_netdev(ndev);
1056
1057         setup_pin_mux(0);
1058
1059         return 0;
1060 }
1061
1062 #ifdef CONFIG_PM
1063 static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
1064 {
1065         struct net_device *net_dev = platform_get_drvdata(pdev);
1066
1067         if (netif_running(net_dev))
1068                 bf537mac_close(net_dev);
1069
1070         return 0;
1071 }
1072
1073 static int bfin_mac_resume(struct platform_device *pdev)
1074 {
1075         struct net_device *net_dev = platform_get_drvdata(pdev);
1076
1077         if (netif_running(net_dev))
1078                 bf537mac_open(net_dev);
1079
1080         return 0;
1081 }
1082 #else
1083 #define bfin_mac_suspend NULL
1084 #define bfin_mac_resume NULL
1085 #endif  /* CONFIG_PM */
1086
1087 static struct platform_driver bfin_mac_driver = {
1088         .probe = bfin_mac_probe,
1089         .remove = bfin_mac_remove,
1090         .resume = bfin_mac_resume,
1091         .suspend = bfin_mac_suspend,
1092         .driver = {
1093                 .name = DRV_NAME,
1094                 .owner  = THIS_MODULE,
1095         },
1096 };
1097
1098 static int __init bfin_mac_init(void)
1099 {
1100         return platform_driver_register(&bfin_mac_driver);
1101 }
1102
1103 module_init(bfin_mac_init);
1104
1105 static void __exit bfin_mac_cleanup(void)
1106 {
1107         platform_driver_unregister(&bfin_mac_driver);
1108 }
1109
1110 module_exit(bfin_mac_cleanup);
1111