drivers/net/bfin_mac.c

   1 /*
   2  * File:        drivers/net/bfin_mac.c
   3  * Based on:
   4  * Maintainer:
   5  *              Bryan Wu <bryan.wu@analog.com>
   6  *
   7  * Original author:
   8  *              Luke Yang <luke.yang@analog.com>
   9  *
  10  * Created:
  11  * Description:
  12  *
  13  * Modified:
  14  *              Copyright 2004-2006 Analog Devices Inc.
  15  *
  16  * Bugs:        Enter bugs at http://blackfin.uclinux.org/
  17  *
  18  * This program is free software ;  you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License as published by
  20  * the Free Software Foundation ;  either version 2, or (at your option)
  21  * any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY ;  without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program ;  see the file COPYING.
  30  * If not, write to the Free Software Foundation,
  31  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  32  */
  33
  34 #include <linux/init.h>
  35 #include <linux/module.h>
  36 #include <linux/kernel.h>
  37 #include <linux/sched.h>
  38 #include <linux/slab.h>
  39 #include <linux/delay.h>
  40 #include <linux/timer.h>
  41 #include <linux/errno.h>
  42 #include <linux/irq.h>
  43 #include <linux/io.h>
  44 #include <linux/ioport.h>
  45 #include <linux/crc32.h>
  46 #include <linux/device.h>
  47 #include <linux/spinlock.h>
  48 #include <linux/ethtool.h>
  49 #include <linux/mii.h>
  50 #include <linux/phy.h>
  51 #include <linux/netdevice.h>
  52 #include <linux/etherdevice.h>
  53 #include <linux/skbuff.h>
  54 #include <linux/platform_device.h>
  55
  56 #include <asm/dma.h>
  57 #include <linux/dma-mapping.h>
  58
  59 #include <asm/blackfin.h>
  60 #include <asm/cacheflush.h>
  61 #include <asm/portmux.h>
  62
  63 #include "bfin_mac.h"
  64
  65 #define DRV_NAME        "bfin_mac"
  66 #define DRV_VERSION     "1.1"
  67 #define DRV_AUTHOR      "Bryan Wu, Luke Yang"
  68 #define DRV_DESC        "Blackfin BF53[67] on-chip Ethernet MAC driver"
  69
  70 MODULE_AUTHOR(DRV_AUTHOR);
  71 MODULE_LICENSE("GPL");
  72 MODULE_DESCRIPTION(DRV_DESC);
  73
  74 #if defined(CONFIG_BFIN_MAC_USE_L1)
  75 # define bfin_mac_alloc(dma_handle, size)  l1_data_sram_zalloc(size)
  76 # define bfin_mac_free(dma_handle, ptr)    l1_data_sram_free(ptr)
  77 #else
  78 # define bfin_mac_alloc(dma_handle, size) \
  79         dma_alloc_coherent(NULL, size, dma_handle, GFP_KERNEL)
  80 # define bfin_mac_free(dma_handle, ptr) \
  81         dma_free_coherent(NULL, sizeof(*ptr), ptr, dma_handle)
  82 #endif
  83
  84 #define PKT_BUF_SZ 1580
  85
  86 #define MAX_TIMEOUT_CNT 500
  87
  88 /* pointers to maintain transmit list */
  89 static struct net_dma_desc_tx *tx_list_head;
  90 static struct net_dma_desc_tx *tx_list_tail;
  91 static struct net_dma_desc_rx *rx_list_head;
  92 static struct net_dma_desc_rx *rx_list_tail;
  93 static struct net_dma_desc_rx *current_rx_ptr;
  94 static struct net_dma_desc_tx *current_tx_ptr;
  95 static struct net_dma_desc_tx *tx_desc;
  96 static struct net_dma_desc_rx *rx_desc;
  97
  98 static void bf537mac_disable(void);
  99 static void bf537mac_enable(void);
 100
 101 static void desc_list_free(void)
 102 {
 103         struct net_dma_desc_rx *r;
 104         struct net_dma_desc_tx *t;
 105         int i;
 106 #if !defined(CONFIG_BFIN_MAC_USE_L1)
 107         dma_addr_t dma_handle = 0;
 108 #endif
 109
 110         if (tx_desc) {
 111                 t = tx_list_head;
 112                 for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
 113                         if (t) {
 114                                 if (t->skb) {
 115                                         dev_kfree_skb(t->skb);
 116                                         t->skb = NULL;
 117                                 }
 118                                 t = t->next;
 119                         }
 120                 }
 121                 bfin_mac_free(dma_handle, tx_desc);
 122         }
 123
 124         if (rx_desc) {
 125                 r = rx_list_head;
 126                 for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
 127                         if (r) {
 128                                 if (r->skb) {
 129                                         dev_kfree_skb(r->skb);
 130                                         r->skb = NULL;
 131                                 }
 132                                 r = r->next;
 133                         }
 134                 }
 135                 bfin_mac_free(dma_handle, rx_desc);
 136         }
 137 }
 138
 139 static int desc_list_init(void)
 140 {
 141         int i;
 142         struct sk_buff *new_skb;
 143 #if !defined(CONFIG_BFIN_MAC_USE_L1)
 144         /*
 145          * This dma_handle is useless in Blackfin dma_alloc_coherent().
 146          * The real dma handler is the return value of dma_alloc_coherent().
 147          */
 148         dma_addr_t dma_handle;
 149 #endif
 150
 151         tx_desc = bfin_mac_alloc(&dma_handle,
 152                                 sizeof(struct net_dma_desc_tx) *
 153                                 CONFIG_BFIN_TX_DESC_NUM);
 154         if (tx_desc == NULL)
 155                 goto init_error;
 156
 157         rx_desc = bfin_mac_alloc(&dma_handle,
 158                                 sizeof(struct net_dma_desc_rx) *
 159                                 CONFIG_BFIN_RX_DESC_NUM);
 160         if (rx_desc == NULL)
 161                 goto init_error;
 162
 163         /* init tx_list */
 164         tx_list_head = tx_list_tail = tx_desc;
 165
 166         for (i = 0; i < CONFIG_BFIN_TX_DESC_NUM; i++) {
 167                 struct net_dma_desc_tx *t = tx_desc + i;
 168                 struct dma_descriptor *a = &(t->desc_a);
 169                 struct dma_descriptor *b = &(t->desc_b);
 170
 171                 /*
 172                  * disable DMA
 173                  * read from memory WNR = 0
 174                  * wordsize is 32 bits
 175                  * 6 half words is desc size
 176                  * large desc flow
 177                  */
 178                 a->config = WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
 179                 a->start_addr = (unsigned long)t->packet;
 180                 a->x_count = 0;
 181                 a->next_dma_desc = b;
 182
 183                 /*
 184                  * enabled DMA
 185                  * write to memory WNR = 1
 186                  * wordsize is 32 bits
 187                  * disable interrupt
 188                  * 6 half words is desc size
 189                  * large desc flow
 190                  */
 191                 b->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
 192                 b->start_addr = (unsigned long)(&(t->status));
 193                 b->x_count = 0;
 194
 195                 t->skb = NULL;
 196                 tx_list_tail->desc_b.next_dma_desc = a;
 197                 tx_list_tail->next = t;
 198                 tx_list_tail = t;
 199         }
 200         tx_list_tail->next = tx_list_head;      /* tx_list is a circle */
 201         tx_list_tail->desc_b.next_dma_desc = &(tx_list_head->desc_a);
 202         current_tx_ptr = tx_list_head;
 203
 204         /* init rx_list */
 205         rx_list_head = rx_list_tail = rx_desc;
 206
 207         for (i = 0; i < CONFIG_BFIN_RX_DESC_NUM; i++) {
 208                 struct net_dma_desc_rx *r = rx_desc + i;
 209                 struct dma_descriptor *a = &(r->desc_a);
 210                 struct dma_descriptor *b = &(r->desc_b);
 211
 212                 /* allocate a new skb for next time receive */
 213                 new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
 214                 if (!new_skb) {
 215                         printk(KERN_NOTICE DRV_NAME
 216                                ": init: low on mem - packet dropped\n");
 217                         goto init_error;
 218                 }
 219                 skb_reserve(new_skb, 2);
 220                 r->skb = new_skb;
 221
 222                 /*
 223                  * enabled DMA
 224                  * write to memory WNR = 1
 225                  * wordsize is 32 bits
 226                  * disable interrupt
 227                  * 6 half words is desc size
 228                  * large desc flow
 229                  */
 230                 a->config = DMAEN | WNR | WDSIZE_32 | NDSIZE_6 | DMAFLOW_LARGE;
 231                 /* since RXDWA is enabled */
 232                 a->start_addr = (unsigned long)new_skb->data - 2;
 233                 a->x_count = 0;
 234                 a->next_dma_desc = b;
 235
 236                 /*
 237                  * enabled DMA
 238                  * write to memory WNR = 1
 239                  * wordsize is 32 bits
 240                  * enable interrupt
 241                  * 6 half words is desc size
 242                  * large desc flow
 243                  */
 244                 b->config = DMAEN | WNR | WDSIZE_32 | DI_EN |
 245                                 NDSIZE_6 | DMAFLOW_LARGE;
 246                 b->start_addr = (unsigned long)(&(r->status));
 247                 b->x_count = 0;
 248
 249                 rx_list_tail->desc_b.next_dma_desc = a;
 250                 rx_list_tail->next = r;
 251                 rx_list_tail = r;
 252         }
 253         rx_list_tail->next = rx_list_head;      /* rx_list is a circle */
 254         rx_list_tail->desc_b.next_dma_desc = &(rx_list_head->desc_a);
 255         current_rx_ptr = rx_list_head;
 256
 257         return 0;
 258
 259 init_error:
 260         desc_list_free();
 261         printk(KERN_ERR DRV_NAME ": kmalloc failed\n");
 262         return -ENOMEM;
 263 }
 264
 265
 266 /*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
 267
 268 /* Set FER regs to MUX in Ethernet pins */
 269 static int setup_pin_mux(int action)
 270 {
 271 #if defined(CONFIG_BFIN_MAC_RMII)
 272         u16 pin_req[] = P_RMII0;
 273 #else
 274         u16 pin_req[] = P_MII0;
 275 #endif
 276
 277         if (action) {
 278                 if (peripheral_request_list(pin_req, DRV_NAME)) {
 279                         printk(KERN_ERR DRV_NAME
 280                         ": Requesting Peripherals failed\n");
 281                         return -EFAULT;
 282                 }
 283         } else
 284                 peripheral_free_list(pin_req);
 285
 286         return 0;
 287 }
 288
 289 /*
 290  * MII operations
 291  */
 292 /* Wait until the previous MDC/MDIO transaction has completed */
 293 static void mdio_poll(void)
 294 {
 295         int timeout_cnt = MAX_TIMEOUT_CNT;
 296
 297         /* poll the STABUSY bit */
 298         while ((bfin_read_EMAC_STAADD()) & STABUSY) {
 299                 mdelay(10);
 300                 if (timeout_cnt-- < 0) {
 301                         printk(KERN_ERR DRV_NAME
 302                         ": wait MDC/MDIO transaction to complete timeout\n");
 303                         break;
 304                 }
 305         }
 306 }
 307
 308 /* Read an off-chip register in a PHY through the MDC/MDIO port */
 309 static int mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
 310 {
 311         mdio_poll();
 312
 313         /* read mode */
 314         bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
 315                                 SET_REGAD((u16) regnum) |
 316                                 STABUSY);
 317
 318         mdio_poll();
 319
 320         return (int) bfin_read_EMAC_STADAT();
 321 }
 322
 323 /* Write an off-chip register in a PHY through the MDC/MDIO port */
 324 static int mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
 325                          u16 value)
 326 {
 327         mdio_poll();
 328
 329         bfin_write_EMAC_STADAT((u32) value);
 330
 331         /* write mode */
 332         bfin_write_EMAC_STAADD(SET_PHYAD((u16) phy_addr) |
 333                                 SET_REGAD((u16) regnum) |
 334                                 STAOP |
 335                                 STABUSY);
 336
 337         mdio_poll();
 338
 339         return 0;
 340 }
 341
 342 static int mdiobus_reset(struct mii_bus *bus)
 343 {
 344         return 0;
 345 }
 346
 347 static void bf537_adjust_link(struct net_device *dev)
 348 {
 349         struct bf537mac_local *lp = netdev_priv(dev);
 350         struct phy_device *phydev = lp->phydev;
 351         unsigned long flags;
 352         int new_state = 0;
 353
 354         spin_lock_irqsave(&lp->lock, flags);
 355         if (phydev->link) {
 356                 /* Now we make sure that we can be in full duplex mode.
 357                  * If not, we operate in half-duplex mode. */
 358                 if (phydev->duplex != lp->old_duplex) {
 359                         u32 opmode = bfin_read_EMAC_OPMODE();
 360                         new_state = 1;
 361
 362                         if (phydev->duplex)
 363                                 opmode |= FDMODE;
 364                         else
 365                                 opmode &= ~(FDMODE);
 366
 367                         bfin_write_EMAC_OPMODE(opmode);
 368                         lp->old_duplex = phydev->duplex;
 369                 }
 370
 371                 if (phydev->speed != lp->old_speed) {
 372 #if defined(CONFIG_BFIN_MAC_RMII)
 373                         u32 opmode = bfin_read_EMAC_OPMODE();
 374                         switch (phydev->speed) {
 375                         case 10:
 376                                 opmode |= RMII_10;
 377                                 break;
 378                         case 100:
 379                                 opmode &= ~(RMII_10);
 380                                 break;
 381                         default:
 382                                 printk(KERN_WARNING
 383                                         "%s: Ack!  Speed (%d) is not 10/100!\n",
 384                                         DRV_NAME, phydev->speed);
 385                                 break;
 386                         }
 387                         bfin_write_EMAC_OPMODE(opmode);
 388 #endif
 389
 390                         new_state = 1;
 391                         lp->old_speed = phydev->speed;
 392                 }
 393
 394                 if (!lp->old_link) {
 395                         new_state = 1;
 396                         lp->old_link = 1;
 397                         netif_schedule(dev);
 398                 }
 399         } else if (lp->old_link) {
 400                 new_state = 1;
 401                 lp->old_link = 0;
 402                 lp->old_speed = 0;
 403                 lp->old_duplex = -1;
 404         }
 405
 406         if (new_state) {
 407                 u32 opmode = bfin_read_EMAC_OPMODE();
 408                 phy_print_status(phydev);
 409                 pr_debug("EMAC_OPMODE = 0x%08x\n", opmode);
 410         }
 411
 412         spin_unlock_irqrestore(&lp->lock, flags);
 413 }
 414
 415 static int mii_probe(struct net_device *dev)
 416 {
 417         struct bf537mac_local *lp = netdev_priv(dev);
 418         struct phy_device *phydev = NULL;
 419         unsigned short sysctl;
 420         int i;
 421
 422         /* Enable PHY output early */
 423         if (!(bfin_read_VR_CTL() & PHYCLKOE))
 424                 bfin_write_VR_CTL(bfin_read_VR_CTL() | PHYCLKOE);
 425
 426         /* MDC  = 2.5 MHz */
 427         sysctl = bfin_read_EMAC_SYSCTL();
 428         sysctl |= SET_MDCDIV(24);
 429         bfin_write_EMAC_SYSCTL(sysctl);
 430
 431         /* search for connect PHY device */
 432         for (i = 0; i < PHY_MAX_ADDR; i++) {
 433                 struct phy_device *const tmp_phydev = lp->mii_bus.phy_map[i];
 434
 435                 if (!tmp_phydev)
 436                         continue; /* no PHY here... */
 437
 438                 phydev = tmp_phydev;
 439                 break; /* found it */
 440         }
 441
 442         /* now we are supposed to have a proper phydev, to attach to... */
 443         if (!phydev) {
 444                 printk(KERN_INFO "%s: Don't found any phy device at all\n",
 445                         dev->name);
 446                 return -ENODEV;
 447         }
 448
 449 #if defined(CONFIG_BFIN_MAC_RMII)
 450         phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
 451                         PHY_INTERFACE_MODE_RMII);
 452 #else
 453         phydev = phy_connect(dev, phydev->dev.bus_id, &bf537_adjust_link, 0,
 454                         PHY_INTERFACE_MODE_MII);
 455 #endif
 456
 457         if (IS_ERR(phydev)) {
 458                 printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
 459                 return PTR_ERR(phydev);
 460         }
 461
 462         /* mask with MAC supported features */
 463         phydev->supported &= (SUPPORTED_10baseT_Half
 464                               | SUPPORTED_10baseT_Full
 465                               | SUPPORTED_100baseT_Half
 466                               | SUPPORTED_100baseT_Full
 467                               | SUPPORTED_Autoneg
 468                               | SUPPORTED_Pause | SUPPORTED_Asym_Pause
 469                               | SUPPORTED_MII
 470                               | SUPPORTED_TP);
 471
 472         phydev->advertising = phydev->supported;
 473
 474         lp->old_link = 0;
 475         lp->old_speed = 0;
 476         lp->old_duplex = -1;
 477         lp->phydev = phydev;
 478
 479         printk(KERN_INFO "%s: attached PHY driver [%s] "
 480                "(mii_bus:phy_addr=%s, irq=%d)\n",
 481                DRV_NAME, phydev->drv->name, phydev->dev.bus_id, phydev->irq);
 482
 483         return 0;
 484 }
 485
 486 /**************************************************************************/
 487 void setup_system_regs(struct net_device *dev)
 488 {
 489         unsigned short sysctl;
 490
 491         /*
 492          * Odd word alignment for Receive Frame DMA word
 493          * Configure checksum support and rcve frame word alignment
 494          */
 495         sysctl = bfin_read_EMAC_SYSCTL();
 496 #if defined(BFIN_MAC_CSUM_OFFLOAD)
 497         sysctl |= RXDWA | RXCKS;
 498 #else
 499         sysctl |= RXDWA;
 500 #endif
 501         bfin_write_EMAC_SYSCTL(sysctl);
 502
 503         bfin_write_EMAC_MMC_CTL(RSTC | CROLL);
 504
 505         /* Initialize the TX DMA channel registers */
 506         bfin_write_DMA2_X_COUNT(0);
 507         bfin_write_DMA2_X_MODIFY(4);
 508         bfin_write_DMA2_Y_COUNT(0);
 509         bfin_write_DMA2_Y_MODIFY(0);
 510
 511         /* Initialize the RX DMA channel registers */
 512         bfin_write_DMA1_X_COUNT(0);
 513         bfin_write_DMA1_X_MODIFY(4);
 514         bfin_write_DMA1_Y_COUNT(0);
 515         bfin_write_DMA1_Y_MODIFY(0);
 516 }
 517
 518 static void setup_mac_addr(u8 *mac_addr)
 519 {
 520         u32 addr_low = le32_to_cpu(*(__le32 *) & mac_addr[0]);
 521         u16 addr_hi = le16_to_cpu(*(__le16 *) & mac_addr[4]);
 522
 523         /* this depends on a little-endian machine */
 524         bfin_write_EMAC_ADDRLO(addr_low);
 525         bfin_write_EMAC_ADDRHI(addr_hi);
 526 }
 527
 528 static int bf537mac_set_mac_address(struct net_device *dev, void *p)
 529 {
 530         struct sockaddr *addr = p;
 531         if (netif_running(dev))
 532                 return -EBUSY;
 533         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 534         setup_mac_addr(dev->dev_addr);
 535         return 0;
 536 }
 537
 538 static void adjust_tx_list(void)
 539 {
 540         int timeout_cnt = MAX_TIMEOUT_CNT;
 541
 542         if (tx_list_head->status.status_word != 0
 543             && current_tx_ptr != tx_list_head) {
 544                 goto adjust_head;       /* released something, just return; */
 545         }
 546
 547         /*
 548          * if nothing released, check wait condition
 549          * current's next can not be the head,
 550          * otherwise the dma will not stop as we want
 551          */
 552         if (current_tx_ptr->next->next == tx_list_head) {
 553                 while (tx_list_head->status.status_word == 0) {
 554                         mdelay(10);
 555                         if (tx_list_head->status.status_word != 0
 556                             || !(bfin_read_DMA2_IRQ_STATUS() & 0x08)) {
 557                                 goto adjust_head;
 558                         }
 559                         if (timeout_cnt-- < 0) {
 560                                 printk(KERN_ERR DRV_NAME
 561                                 ": wait for adjust tx list head timeout\n");
 562                                 break;
 563                         }
 564                 }
 565                 if (tx_list_head->status.status_word != 0) {
 566                         goto adjust_head;
 567                 }
 568         }
 569
 570         return;
 571
 572 adjust_head:
 573         do {
 574                 tx_list_head->desc_a.config &= ~DMAEN;
 575                 tx_list_head->status.status_word = 0;
 576                 if (tx_list_head->skb) {
 577                         dev_kfree_skb(tx_list_head->skb);
 578                         tx_list_head->skb = NULL;
 579                 } else {
 580                         printk(KERN_ERR DRV_NAME
 581                                ": no sk_buff in a transmitted frame!\n");
 582                 }
 583                 tx_list_head = tx_list_head->next;
 584         } while (tx_list_head->status.status_word != 0
 585                  && current_tx_ptr != tx_list_head);
 586         return;
 587
 588 }
 589
 590 static int bf537mac_hard_start_xmit(struct sk_buff *skb,
 591                                 struct net_device *dev)
 592 {
 593         struct bf537mac_local *lp = netdev_priv(dev);
 594         unsigned int data;
 595
 596         current_tx_ptr->skb = skb;
 597
 598         /*
 599          * Is skb->data always 16-bit aligned?
 600          * Do we need to memcpy((char *)(tail->packet + 2), skb->data, len)?
 601          */
 602         if ((((unsigned int)(skb->data)) & 0x02) == 2) {
 603                 /* move skb->data to current_tx_ptr payload */
 604                 data = (unsigned int)(skb->data) - 2;
 605                 *((unsigned short *)data) = (unsigned short)(skb->len);
 606                 current_tx_ptr->desc_a.start_addr = (unsigned long)data;
 607                 /* this is important! */
 608                 blackfin_dcache_flush_range(data, (data + (skb->len)) + 2);
 609
 610         } else {
 611                 *((unsigned short *)(current_tx_ptr->packet)) =
 612                     (unsigned short)(skb->len);
 613                 memcpy((char *)(current_tx_ptr->packet + 2), skb->data,
 614                        (skb->len));
 615                 current_tx_ptr->desc_a.start_addr =
 616                     (unsigned long)current_tx_ptr->packet;
 617                 if (current_tx_ptr->status.status_word != 0)
 618                         current_tx_ptr->status.status_word = 0;
 619                 blackfin_dcache_flush_range((unsigned int)current_tx_ptr->
 620                                             packet,
 621                                             (unsigned int)(current_tx_ptr->
 622                                                            packet + skb->len) +
 623                                             2);
 624         }
 625
 626         /* enable this packet's dma */
 627         current_tx_ptr->desc_a.config |= DMAEN;
 628
 629         /* tx dma is running, just return */
 630         if (bfin_read_DMA2_IRQ_STATUS() & 0x08)
 631                 goto out;
 632
 633         /* tx dma is not running */
 634         bfin_write_DMA2_NEXT_DESC_PTR(&(current_tx_ptr->desc_a));
 635         /* dma enabled, read from memory, size is 6 */
 636         bfin_write_DMA2_CONFIG(current_tx_ptr->desc_a.config);
 637         /* Turn on the EMAC tx */
 638         bfin_write_EMAC_OPMODE(bfin_read_EMAC_OPMODE() | TE);
 639
 640 out:
 641         adjust_tx_list();
 642         current_tx_ptr = current_tx_ptr->next;
 643         dev->trans_start = jiffies;
 644         dev->stats.tx_packets++;
 645         dev->stats.tx_bytes += (skb->len);
 646         return 0;
 647 }
 648
 649 static void bf537mac_rx(struct net_device *dev)
 650 {
 651         struct sk_buff *skb, *new_skb;
 652         struct bf537mac_local *lp = netdev_priv(dev);
 653         unsigned short len;
 654
 655         /* allocate a new skb for next time receive */
 656         skb = current_rx_ptr->skb;
 657         new_skb = dev_alloc_skb(PKT_BUF_SZ + 2);
 658         if (!new_skb) {
 659                 printk(KERN_NOTICE DRV_NAME
 660                        ": rx: low on mem - packet dropped\n");
 661                 dev->stats.rx_dropped++;
 662                 goto out;
 663         }
 664         /* reserve 2 bytes for RXDWA padding */
 665         skb_reserve(new_skb, 2);
 666         current_rx_ptr->skb = new_skb;
 667         current_rx_ptr->desc_a.start_addr = (unsigned long)new_skb->data - 2;
 668
 669         len = (unsigned short)((current_rx_ptr->status.status_word) & RX_FRLEN);
 670         skb_put(skb, len);
 671         blackfin_dcache_invalidate_range((unsigned long)skb->head,
 672                                          (unsigned long)skb->tail);
 673
 674         dev->last_rx = jiffies;
 675         skb->dev = dev;
 676         skb->protocol = eth_type_trans(skb, dev);
 677 #if defined(BFIN_MAC_CSUM_OFFLOAD)
 678         skb->csum = current_rx_ptr->status.ip_payload_csum;
 679         skb->ip_summed = CHECKSUM_PARTIAL;
 680 #endif
 681
 682         netif_rx(skb);
 683         dev->stats.rx_packets++;
 684         dev->stats.rx_bytes += len;
 685         current_rx_ptr->status.status_word = 0x00000000;
 686         current_rx_ptr = current_rx_ptr->next;
 687
 688 out:
 689         return;
 690 }
 691
 692 /* interrupt routine to handle rx and error signal */
 693 static irqreturn_t bf537mac_interrupt(int irq, void *dev_id)
 694 {
 695         struct net_device *dev = dev_id;
 696         int number = 0;
 697
 698 get_one_packet:
 699         if (current_rx_ptr->status.status_word == 0) {
 700                 /* no more new packet received */
 701                 if (number == 0) {
 702                         if (current_rx_ptr->next->status.status_word != 0) {
 703                                 current_rx_ptr = current_rx_ptr->next;
 704                                 goto real_rx;
 705                         }
 706                 }
 707                 bfin_write_DMA1_IRQ_STATUS(bfin_read_DMA1_IRQ_STATUS() |
 708                                            DMA_DONE | DMA_ERR);
 709                 return IRQ_HANDLED;
 710         }
 711
 712 real_rx:
 713         bf537mac_rx(dev);
 714         number++;
 715         goto get_one_packet;
 716 }
 717
 718 #ifdef CONFIG_NET_POLL_CONTROLLER
 719 static void bf537mac_poll(struct net_device *dev)
 720 {
 721         disable_irq(IRQ_MAC_RX);
 722         bf537mac_interrupt(IRQ_MAC_RX, dev);
 723         enable_irq(IRQ_MAC_RX);
 724 }
 725 #endif                          /* CONFIG_NET_POLL_CONTROLLER */
 726
 727 static void bf537mac_disable(void)
 728 {
 729         unsigned int opmode;
 730
 731         opmode = bfin_read_EMAC_OPMODE();
 732         opmode &= (~RE);
 733         opmode &= (~TE);
 734         /* Turn off the EMAC */
 735         bfin_write_EMAC_OPMODE(opmode);
 736 }
 737
 738 /*
 739  * Enable Interrupts, Receive, and Transmit
 740  */
 741 static void bf537mac_enable(void)
 742 {
 743         u32 opmode;
 744
 745         pr_debug("%s: %s\n", DRV_NAME, __FUNCTION__);
 746
 747         /* Set RX DMA */
 748         bfin_write_DMA1_NEXT_DESC_PTR(&(rx_list_head->desc_a));
 749         bfin_write_DMA1_CONFIG(rx_list_head->desc_a.config);
 750
 751         /* Wait MII done */
 752         mdio_poll();
 753
 754         /* We enable only RX here */
 755         /* ASTP   : Enable Automatic Pad Stripping
 756            PR     : Promiscuous Mode for test
 757            PSF    : Receive frames with total length less than 64 bytes.
 758            FDMODE : Full Duplex Mode
 759            LB     : Internal Loopback for test
 760            RE     : Receiver Enable */
 761         opmode = bfin_read_EMAC_OPMODE();
 762         if (opmode & FDMODE)
 763                 opmode |= PSF;
 764         else
 765                 opmode |= DRO | DC | PSF;
 766         opmode |= RE;
 767
 768 #if defined(CONFIG_BFIN_MAC_RMII)
 769         opmode |= RMII; /* For Now only 100MBit are supported */
 770 #ifdef CONFIG_BF_REV_0_2
 771         opmode |= TE;
 772 #endif
 773 #endif
 774         /* Turn on the EMAC rx */
 775         bfin_write_EMAC_OPMODE(opmode);
 776 }
 777
 778 /* Our watchdog timed out. Called by the networking layer */
 779 static void bf537mac_timeout(struct net_device *dev)
 780 {
 781         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
 782
 783         bf537mac_disable();
 784
 785         /* reset tx queue */
 786         tx_list_tail = tx_list_head->next;
 787
 788         bf537mac_enable();
 789
 790         /* We can accept TX packets again */
 791         dev->trans_start = jiffies;
 792         netif_wake_queue(dev);
 793 }
 794
 795 /*
 796  * This routine will, depending on the values passed to it,
 797  * either make it accept multicast packets, go into
 798  * promiscuous mode (for TCPDUMP and cousins) or accept
 799  * a select set of multicast packets
 800  */
 801 static void bf537mac_set_multicast_list(struct net_device *dev)
 802 {
 803         u32 sysctl;
 804
 805         if (dev->flags & IFF_PROMISC) {
 806                 printk(KERN_INFO "%s: set to promisc mode\n", dev->name);
 807                 sysctl = bfin_read_EMAC_OPMODE();
 808                 sysctl |= RAF;
 809                 bfin_write_EMAC_OPMODE(sysctl);
 810         } else if (dev->flags & IFF_ALLMULTI || dev->mc_count) {
 811                 /* accept all multicast */
 812                 sysctl = bfin_read_EMAC_OPMODE();
 813                 sysctl |= PAM;
 814                 bfin_write_EMAC_OPMODE(sysctl);
 815         } else {
 816                 /* clear promisc or multicast mode */
 817                 sysctl = bfin_read_EMAC_OPMODE();
 818                 sysctl &= ~(RAF | PAM);
 819                 bfin_write_EMAC_OPMODE(sysctl);
 820         }
 821 }
 822
 823 /*
 824  * this puts the device in an inactive state
 825  */
 826 static void bf537mac_shutdown(struct net_device *dev)
 827 {
 828         /* Turn off the EMAC */
 829         bfin_write_EMAC_OPMODE(0x00000000);
 830         /* Turn off the EMAC RX DMA */
 831         bfin_write_DMA1_CONFIG(0x0000);
 832         bfin_write_DMA2_CONFIG(0x0000);
 833 }
 834
 835 /*
 836  * Open and Initialize the interface
 837  *
 838  * Set up everything, reset the card, etc..
 839  */
 840 static int bf537mac_open(struct net_device *dev)
 841 {
 842         struct bf537mac_local *lp = netdev_priv(dev);
 843         int retval;
 844         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
 845
 846         /*
 847          * Check that the address is valid.  If its not, refuse
 848          * to bring the device up.  The user must specify an
 849          * address using ifconfig eth0 hw ether xx:xx:xx:xx:xx:xx
 850          */
 851         if (!is_valid_ether_addr(dev->dev_addr)) {
 852                 printk(KERN_WARNING DRV_NAME ": no valid ethernet hw addr\n");
 853                 return -EINVAL;
 854         }
 855
 856         /* initial rx and tx list */
 857         retval = desc_list_init();
 858
 859         if (retval)
 860                 return retval;
 861
 862         phy_start(lp->phydev);
 863         setup_system_regs(dev);
 864         bf537mac_disable();
 865         bf537mac_enable();
 866
 867         pr_debug("hardware init finished\n");
 868         netif_start_queue(dev);
 869         netif_carrier_on(dev);
 870
 871         return 0;
 872 }
 873
 874 /*
 875  *
 876  * this makes the board clean up everything that it can
 877  * and not talk to the outside world.   Caused by
 878  * an 'ifconfig ethX down'
 879  */
 880 static int bf537mac_close(struct net_device *dev)
 881 {
 882         struct bf537mac_local *lp = netdev_priv(dev);
 883         pr_debug("%s: %s\n", dev->name, __FUNCTION__);
 884
 885         netif_stop_queue(dev);
 886         netif_carrier_off(dev);
 887
 888         phy_stop(lp->phydev);
 889
 890         /* clear everything */
 891         bf537mac_shutdown(dev);
 892
 893         /* free the rx/tx buffers */
 894         desc_list_free();
 895
 896         return 0;
 897 }
 898
 899 static int __init bf537mac_probe(struct net_device *dev)
 900 {
 901         struct bf537mac_local *lp = netdev_priv(dev);
 902         int retval;
 903         int i;
 904
 905         /* Grab the MAC address in the MAC */
 906         *(__le32 *) (&(dev->dev_addr[0])) = cpu_to_le32(bfin_read_EMAC_ADDRLO());
 907         *(__le16 *) (&(dev->dev_addr[4])) = cpu_to_le16((u16) bfin_read_EMAC_ADDRHI());
 908
 909         /* probe mac */
 910         /*todo: how to proble? which is revision_register */
 911         bfin_write_EMAC_ADDRLO(0x12345678);
 912         if (bfin_read_EMAC_ADDRLO() != 0x12345678) {
 913                 pr_debug("can't detect bf537 mac!\n");
 914                 retval = -ENODEV;
 915                 goto err_out;
 916         }
 917
 918         /* set the GPIO pins to Ethernet mode */
 919         retval = setup_pin_mux(1);
 920         if (retval)
 921                 return retval;
 922
 923         /*Is it valid? (Did bootloader initialize it?) */
 924         if (!is_valid_ether_addr(dev->dev_addr)) {
 925                 /* Grab the MAC from the board somehow - this is done in the
 926                    arch/blackfin/mach-bf537/boards/eth_mac.c */
 927                 get_bf537_ether_addr(dev->dev_addr);
 928         }
 929
 930         /* If still not valid, get a random one */
 931         if (!is_valid_ether_addr(dev->dev_addr)) {
 932                 random_ether_addr(dev->dev_addr);
 933         }
 934
 935         setup_mac_addr(dev->dev_addr);
 936
 937         /* MDIO bus initial */
 938         lp->mii_bus.priv = dev;
 939         lp->mii_bus.read = mdiobus_read;
 940         lp->mii_bus.write = mdiobus_write;
 941         lp->mii_bus.reset = mdiobus_reset;
 942         lp->mii_bus.name = "bfin_mac_mdio";
 943         lp->mii_bus.id = 0;
 944         lp->mii_bus.irq = kmalloc(sizeof(int)*PHY_MAX_ADDR, GFP_KERNEL);
 945         for (i = 0; i < PHY_MAX_ADDR; ++i)
 946                 lp->mii_bus.irq[i] = PHY_POLL;
 947
 948         mdiobus_register(&lp->mii_bus);
 949
 950         retval = mii_probe(dev);
 951         if (retval)
 952                 return retval;
 953
 954         /* Fill in the fields of the device structure with ethernet values. */
 955         ether_setup(dev);
 956
 957         dev->open = bf537mac_open;
 958         dev->stop = bf537mac_close;
 959         dev->hard_start_xmit = bf537mac_hard_start_xmit;
 960         dev->set_mac_address = bf537mac_set_mac_address;
 961         dev->tx_timeout = bf537mac_timeout;
 962         dev->set_multicast_list = bf537mac_set_multicast_list;
 963 #ifdef CONFIG_NET_POLL_CONTROLLER
 964         dev->poll_controller = bf537mac_poll;
 965 #endif
 966
 967         spin_lock_init(&lp->lock);
 968
 969         /* now, enable interrupts */
 970         /* register irq handler */
 971         if (request_irq
 972             (IRQ_MAC_RX, bf537mac_interrupt, IRQF_DISABLED | IRQF_SHARED,
 973              "BFIN537_MAC_RX", dev)) {
 974                 printk(KERN_WARNING DRV_NAME
 975                        ": Unable to attach BlackFin MAC RX interrupt\n");
 976                 return -EBUSY;
 977         }
 978
 979
 980         retval = register_netdev(dev);
 981         if (retval == 0) {
 982                 /* now, print out the card info, in a short format.. */
 983                 printk(KERN_INFO "%s: Version %s, %s\n",
 984                          DRV_NAME, DRV_VERSION, DRV_DESC);
 985         }
 986
 987 err_out:
 988         return retval;
 989 }
 990
 991 static int bfin_mac_probe(struct platform_device *pdev)
 992 {
 993         struct net_device *ndev;
 994
 995         ndev = alloc_etherdev(sizeof(struct bf537mac_local));
 996         if (!ndev) {
 997                 printk(KERN_WARNING DRV_NAME ": could not allocate device\n");
 998                 return -ENOMEM;
 999         }
1000
1001         SET_NETDEV_DEV(ndev, &pdev->dev);
1002
1003         platform_set_drvdata(pdev, ndev);
1004
1005         if (bf537mac_probe(ndev) != 0) {
1006                 platform_set_drvdata(pdev, NULL);
1007                 free_netdev(ndev);
1008                 printk(KERN_WARNING DRV_NAME ": not found\n");
1009                 return -ENODEV;
1010         }
1011
1012         return 0;
1013 }
1014
1015 static int bfin_mac_remove(struct platform_device *pdev)
1016 {
1017         struct net_device *ndev = platform_get_drvdata(pdev);
1018
1019         platform_set_drvdata(pdev, NULL);
1020
1021         unregister_netdev(ndev);
1022
1023         free_irq(IRQ_MAC_RX, ndev);
1024
1025         free_netdev(ndev);
1026
1027         setup_pin_mux(0);
1028
1029         return 0;
1030 }
1031
1032 #ifdef CONFIG_PM
1033 static int bfin_mac_suspend(struct platform_device *pdev, pm_message_t mesg)
1034 {
1035         struct net_device *net_dev = platform_get_drvdata(pdev);
1036
1037         if (netif_running(net_dev))
1038                 bf537mac_close(net_dev);
1039
1040         return 0;
1041 }
1042
1043 static int bfin_mac_resume(struct platform_device *pdev)
1044 {
1045         struct net_device *net_dev = platform_get_drvdata(pdev);
1046
1047         if (netif_running(net_dev))
1048                 bf537mac_open(net_dev);
1049
1050         return 0;
1051 }
1052 #else
1053 #define bfin_mac_suspend NULL
1054 #define bfin_mac_resume NULL
1055 #endif  /* CONFIG_PM */
1056
1057 static struct platform_driver bfin_mac_driver = {
1058         .probe = bfin_mac_probe,
1059         .remove = bfin_mac_remove,
1060         .resume = bfin_mac_resume,
1061         .suspend = bfin_mac_suspend,
1062         .driver = {
1063                    .name = DRV_NAME,
1064                    },
1065 };
1066
1067 static int __init bfin_mac_init(void)
1068 {
1069         return platform_driver_register(&bfin_mac_driver);
1070 }
1071
1072 module_init(bfin_mac_init);
1073
1074 static void __exit bfin_mac_cleanup(void)
1075 {
1076         platform_driver_unregister(&bfin_mac_driver);
1077 }
1078
1079 module_exit(bfin_mac_cleanup);