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