err.no Git - linux-2.6/blob - drivers/net/pasemi_mac.c

   1 /*
   2  * Copyright (C) 2006-2007 PA Semi, Inc
   3  *
   4  * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/dmaengine.h>
  25 #include <linux/delay.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <asm/dma-mapping.h>
  29 #include <linux/in.h>
  30 #include <linux/skbuff.h>
  31
  32 #include <linux/ip.h>
  33 #include <linux/tcp.h>
  34 #include <net/checksum.h>
  35
  36 #include <asm/irq.h>
  37
  38 #include "pasemi_mac.h"
  39
  40
  41 /* TODO list
  42  *
  43  * - Get rid of pci_{read,write}_config(), map registers with ioremap
  44  *   for performance
  45  * - PHY support
  46  * - Multicast support
  47  * - Large MTU support
  48  * - Other performance improvements
  49  */
  50
  51
  52 /* Must be a power of two */
  53 #define RX_RING_SIZE 512
  54 #define TX_RING_SIZE 512
  55
  56 #define DEFAULT_MSG_ENABLE        \
  57         (NETIF_MSG_DRV          | \
  58          NETIF_MSG_PROBE        | \
  59          NETIF_MSG_LINK         | \
  60          NETIF_MSG_TIMER        | \
  61          NETIF_MSG_IFDOWN       | \
  62          NETIF_MSG_IFUP         | \
  63          NETIF_MSG_RX_ERR       | \
  64          NETIF_MSG_TX_ERR)
  65
  66 #define TX_RING(mac, num)       ((mac)->tx->ring[(num) & (TX_RING_SIZE-1)])
  67 #define TX_RING_INFO(mac, num)  ((mac)->tx->ring_info[(num) & (TX_RING_SIZE-1)])
  68 #define RX_RING(mac, num)       ((mac)->rx->ring[(num) & (RX_RING_SIZE-1)])
  69 #define RX_RING_INFO(mac, num)  ((mac)->rx->ring_info[(num) & (RX_RING_SIZE-1)])
  70 #define RX_BUFF(mac, num)       ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])
  71
  72 #define RING_USED(ring)         (((ring)->next_to_fill - (ring)->next_to_clean) \
  73                                  & ((ring)->size - 1))
  74 #define RING_AVAIL(ring)        ((ring->size) - RING_USED(ring))
  75
  76 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
  77
  78 MODULE_LICENSE("GPL");
  79 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
  80 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
  81
  82 static int debug = -1;  /* -1 == use DEFAULT_MSG_ENABLE as value */
  83 module_param(debug, int, 0);
  84 MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
  85
  86 static struct pasdma_status *dma_status;
  87
  88 static void write_iob_reg(struct pasemi_mac *mac, unsigned int reg,
  89                           unsigned int val)
  90 {
  91         out_le32(mac->iob_regs+reg, val);
  92 }
  93
  94 static unsigned int read_mac_reg(struct pasemi_mac *mac, unsigned int reg)
  95 {
  96         return in_le32(mac->regs+reg);
  97 }
  98
  99 static void write_mac_reg(struct pasemi_mac *mac, unsigned int reg,
 100                           unsigned int val)
 101 {
 102         out_le32(mac->regs+reg, val);
 103 }
 104
 105 static unsigned int read_dma_reg(struct pasemi_mac *mac, unsigned int reg)
 106 {
 107         return in_le32(mac->dma_regs+reg);
 108 }
 109
 110 static void write_dma_reg(struct pasemi_mac *mac, unsigned int reg,
 111                           unsigned int val)
 112 {
 113         out_le32(mac->dma_regs+reg, val);
 114 }
 115
 116 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
 117 {
 118         struct pci_dev *pdev = mac->pdev;
 119         struct device_node *dn = pci_device_to_OF_node(pdev);
 120         int len;
 121         const u8 *maddr;
 122         u8 addr[6];
 123
 124         if (!dn) {
 125                 dev_dbg(&pdev->dev,
 126                           "No device node for mac, not configuring\n");
 127                 return -ENOENT;
 128         }
 129
 130         maddr = of_get_property(dn, "local-mac-address", &len);
 131
 132         if (maddr && len == 6) {
 133                 memcpy(mac->mac_addr, maddr, 6);
 134                 return 0;
 135         }
 136
 137         /* Some old versions of firmware mistakenly uses mac-address
 138          * (and as a string) instead of a byte array in local-mac-address.
 139          */
 140
 141         if (maddr == NULL)
 142                 maddr = of_get_property(dn, "mac-address", NULL);
 143
 144         if (maddr == NULL) {
 145                 dev_warn(&pdev->dev,
 146                          "no mac address in device tree, not configuring\n");
 147                 return -ENOENT;
 148         }
 149
 150
 151         if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
 152                    &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
 153                 dev_warn(&pdev->dev,
 154                          "can't parse mac address, not configuring\n");
 155                 return -EINVAL;
 156         }
 157
 158         memcpy(mac->mac_addr, addr, 6);
 159
 160         return 0;
 161 }
 162
 163 static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
 164                                     struct sk_buff *skb,
 165                                     dma_addr_t *dmas)
 166 {
 167         int f;
 168         int nfrags = skb_shinfo(skb)->nr_frags;
 169
 170         pci_unmap_single(mac->dma_pdev, dmas[0], skb_headlen(skb),
 171                          PCI_DMA_TODEVICE);
 172
 173         for (f = 0; f < nfrags; f++) {
 174                 skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
 175
 176                 pci_unmap_page(mac->dma_pdev, dmas[f+1], frag->size,
 177                                PCI_DMA_TODEVICE);
 178         }
 179         dev_kfree_skb_irq(skb);
 180
 181         /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
 182          * aligned up to a power of 2
 183          */
 184         return (nfrags + 3) & ~1;
 185 }
 186
 187 static int pasemi_mac_setup_rx_resources(struct net_device *dev)
 188 {
 189         struct pasemi_mac_rxring *ring;
 190         struct pasemi_mac *mac = netdev_priv(dev);
 191         int chan_id = mac->dma_rxch;
 192
 193         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 194
 195         if (!ring)
 196                 goto out_ring;
 197
 198         spin_lock_init(&ring->lock);
 199
 200         ring->size = RX_RING_SIZE;
 201         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 202                                   RX_RING_SIZE, GFP_KERNEL);
 203
 204         if (!ring->ring_info)
 205                 goto out_ring_info;
 206
 207         /* Allocate descriptors */
 208         ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
 209                                         RX_RING_SIZE * sizeof(u64),
 210                                         &ring->dma, GFP_KERNEL);
 211
 212         if (!ring->ring)
 213                 goto out_ring_desc;
 214
 215         memset(ring->ring, 0, RX_RING_SIZE * sizeof(u64));
 216
 217         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
 218                                            RX_RING_SIZE * sizeof(u64),
 219                                            &ring->buf_dma, GFP_KERNEL);
 220         if (!ring->buffers)
 221                 goto out_buffers;
 222
 223         memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
 224
 225         write_dma_reg(mac, PAS_DMA_RXCHAN_BASEL(chan_id), PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));
 226
 227         write_dma_reg(mac, PAS_DMA_RXCHAN_BASEU(chan_id),
 228                            PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
 229                            PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
 230
 231         write_dma_reg(mac, PAS_DMA_RXCHAN_CFG(chan_id),
 232                            PAS_DMA_RXCHAN_CFG_HBU(2));
 233
 234         write_dma_reg(mac, PAS_DMA_RXINT_BASEL(mac->dma_if),
 235                            PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers)));
 236
 237         write_dma_reg(mac, PAS_DMA_RXINT_BASEU(mac->dma_if),
 238                            PAS_DMA_RXINT_BASEU_BRBH(__pa(ring->buffers) >> 32) |
 239                            PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
 240
 241         write_dma_reg(mac, PAS_DMA_RXINT_CFG(mac->dma_if),
 242                            PAS_DMA_RXINT_CFG_DHL(3) |
 243                            PAS_DMA_RXINT_CFG_L2 |
 244                            PAS_DMA_RXINT_CFG_LW);
 245
 246         ring->next_to_fill = 0;
 247         ring->next_to_clean = 0;
 248
 249         snprintf(ring->irq_name, sizeof(ring->irq_name),
 250                  "%s rx", dev->name);
 251         mac->rx = ring;
 252
 253         return 0;
 254
 255 out_buffers:
 256         dma_free_coherent(&mac->dma_pdev->dev,
 257                           RX_RING_SIZE * sizeof(u64),
 258                           mac->rx->ring, mac->rx->dma);
 259 out_ring_desc:
 260         kfree(ring->ring_info);
 261 out_ring_info:
 262         kfree(ring);
 263 out_ring:
 264         return -ENOMEM;
 265 }
 266
 267
 268 static int pasemi_mac_setup_tx_resources(struct net_device *dev)
 269 {
 270         struct pasemi_mac *mac = netdev_priv(dev);
 271         u32 val;
 272         int chan_id = mac->dma_txch;
 273         struct pasemi_mac_txring *ring;
 274
 275         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 276         if (!ring)
 277                 goto out_ring;
 278
 279         spin_lock_init(&ring->lock);
 280
 281         ring->size = TX_RING_SIZE;
 282         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 283                                   TX_RING_SIZE, GFP_KERNEL);
 284         if (!ring->ring_info)
 285                 goto out_ring_info;
 286
 287         /* Allocate descriptors */
 288         ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
 289                                         TX_RING_SIZE * sizeof(u64),
 290                                         &ring->dma, GFP_KERNEL);
 291         if (!ring->ring)
 292                 goto out_ring_desc;
 293
 294         memset(ring->ring, 0, TX_RING_SIZE * sizeof(u64));
 295
 296         write_dma_reg(mac, PAS_DMA_TXCHAN_BASEL(chan_id),
 297                            PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
 298         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
 299         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
 300
 301         write_dma_reg(mac, PAS_DMA_TXCHAN_BASEU(chan_id), val);
 302
 303         write_dma_reg(mac, PAS_DMA_TXCHAN_CFG(chan_id),
 304                            PAS_DMA_TXCHAN_CFG_TY_IFACE |
 305                            PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
 306                            PAS_DMA_TXCHAN_CFG_UP |
 307                            PAS_DMA_TXCHAN_CFG_WT(2));
 308
 309         ring->next_to_fill = 0;
 310         ring->next_to_clean = 0;
 311
 312         snprintf(ring->irq_name, sizeof(ring->irq_name),
 313                  "%s tx", dev->name);
 314         mac->tx = ring;
 315
 316         return 0;
 317
 318 out_ring_desc:
 319         kfree(ring->ring_info);
 320 out_ring_info:
 321         kfree(ring);
 322 out_ring:
 323         return -ENOMEM;
 324 }
 325
 326 static void pasemi_mac_free_tx_resources(struct net_device *dev)
 327 {
 328         struct pasemi_mac *mac = netdev_priv(dev);
 329         unsigned int i, j;
 330         struct pasemi_mac_buffer *info;
 331         dma_addr_t dmas[MAX_SKB_FRAGS+1];
 332         int freed;
 333
 334         for (i = 0; i < TX_RING_SIZE; i += freed) {
 335                 info = &TX_RING_INFO(mac, i+1);
 336                 if (info->dma && info->skb) {
 337                         for (j = 0; j <= skb_shinfo(info->skb)->nr_frags; j++)
 338                                 dmas[j] = TX_RING_INFO(mac, i+1+j).dma;
 339                         freed = pasemi_mac_unmap_tx_skb(mac, info->skb, dmas);
 340                 } else
 341                         freed = 2;
 342         }
 343
 344         for (i = 0; i < TX_RING_SIZE; i++)
 345                 TX_RING(mac, i) = 0;
 346
 347         dma_free_coherent(&mac->dma_pdev->dev,
 348                           TX_RING_SIZE * sizeof(u64),
 349                           mac->tx->ring, mac->tx->dma);
 350
 351         kfree(mac->tx->ring_info);
 352         kfree(mac->tx);
 353         mac->tx = NULL;
 354 }
 355
 356 static void pasemi_mac_free_rx_resources(struct net_device *dev)
 357 {
 358         struct pasemi_mac *mac = netdev_priv(dev);
 359         unsigned int i;
 360         struct pasemi_mac_buffer *info;
 361
 362         for (i = 0; i < RX_RING_SIZE; i++) {
 363                 info = &RX_RING_INFO(mac, i);
 364                 if (info->skb && info->dma) {
 365                         pci_unmap_single(mac->dma_pdev,
 366                                          info->dma,
 367                                          info->skb->len,
 368                                          PCI_DMA_FROMDEVICE);
 369                         dev_kfree_skb_any(info->skb);
 370                 }
 371                 info->dma = 0;
 372                 info->skb = NULL;
 373         }
 374
 375         for (i = 0; i < RX_RING_SIZE; i++)
 376                 RX_RING(mac, i) = 0;
 377
 378         dma_free_coherent(&mac->dma_pdev->dev,
 379                           RX_RING_SIZE * sizeof(u64),
 380                           mac->rx->ring, mac->rx->dma);
 381
 382         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
 383                           mac->rx->buffers, mac->rx->buf_dma);
 384
 385         kfree(mac->rx->ring_info);
 386         kfree(mac->rx);
 387         mac->rx = NULL;
 388 }
 389
 390 static void pasemi_mac_replenish_rx_ring(struct net_device *dev, int limit)
 391 {
 392         struct pasemi_mac *mac = netdev_priv(dev);
 393         int start = mac->rx->next_to_fill;
 394         unsigned int fill, count;
 395
 396         if (limit <= 0)
 397                 return;
 398
 399         fill = start;
 400         for (count = 0; count < limit; count++) {
 401                 struct pasemi_mac_buffer *info = &RX_RING_INFO(mac, fill);
 402                 u64 *buff = &RX_BUFF(mac, fill);
 403                 struct sk_buff *skb;
 404                 dma_addr_t dma;
 405
 406                 /* Entry in use? */
 407                 WARN_ON(*buff);
 408
 409                 /* skb might still be in there for recycle on short receives */
 410                 if (info->skb)
 411                         skb = info->skb;
 412                 else
 413                         skb = dev_alloc_skb(BUF_SIZE);
 414
 415                 if (unlikely(!skb))
 416                         break;
 417
 418                 dma = pci_map_single(mac->dma_pdev, skb->data, BUF_SIZE,
 419                                      PCI_DMA_FROMDEVICE);
 420
 421                 if (unlikely(dma_mapping_error(dma))) {
 422                         dev_kfree_skb_irq(info->skb);
 423                         break;
 424                 }
 425
 426                 info->skb = skb;
 427                 info->dma = dma;
 428                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
 429                 fill++;
 430         }
 431
 432         wmb();
 433
 434         write_dma_reg(mac, PAS_DMA_RXCHAN_INCR(mac->dma_rxch), count);
 435         write_dma_reg(mac, PAS_DMA_RXINT_INCR(mac->dma_if), count);
 436
 437         mac->rx->next_to_fill += count;
 438 }
 439
 440 static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
 441 {
 442         unsigned int reg, pcnt;
 443         /* Re-enable packet count interrupts: finally
 444          * ack the packet count interrupt we got in rx_intr.
 445          */
 446
 447         pcnt = *mac->rx_status & PAS_STATUS_PCNT_M;
 448
 449         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
 450
 451         write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 452 }
 453
 454 static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
 455 {
 456         unsigned int reg, pcnt;
 457
 458         /* Re-enable packet count interrupts */
 459         pcnt = *mac->tx_status & PAS_STATUS_PCNT_M;
 460
 461         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
 462
 463         write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
 464 }
 465
 466
 467 static inline void pasemi_mac_rx_error(struct pasemi_mac *mac, u64 macrx)
 468 {
 469         unsigned int rcmdsta, ccmdsta;
 470
 471         if (!netif_msg_rx_err(mac))
 472                 return;
 473
 474         rcmdsta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
 475         ccmdsta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
 476
 477         printk(KERN_ERR "pasemi_mac: rx error. macrx %016lx, rx status %lx\n",
 478                 macrx, *mac->rx_status);
 479
 480         printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
 481                 rcmdsta, ccmdsta);
 482 }
 483
 484 static inline void pasemi_mac_tx_error(struct pasemi_mac *mac, u64 mactx)
 485 {
 486         unsigned int cmdsta;
 487
 488         if (!netif_msg_tx_err(mac))
 489                 return;
 490
 491         cmdsta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
 492
 493         printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016lx, "\
 494                 "tx status 0x%016lx\n", mactx, *mac->tx_status);
 495
 496         printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
 497 }
 498
 499 static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 500 {
 501         unsigned int n;
 502         int count;
 503         struct pasemi_mac_buffer *info;
 504         struct sk_buff *skb;
 505         unsigned int i, len;
 506         u64 macrx;
 507         dma_addr_t dma;
 508
 509         spin_lock(&mac->rx->lock);
 510
 511         n = mac->rx->next_to_clean;
 512
 513         for (count = limit; count; count--) {
 514
 515                 rmb();
 516
 517                 macrx = RX_RING(mac, n);
 518
 519                 if ((macrx & XCT_MACRX_E) ||
 520                     (*mac->rx_status & PAS_STATUS_ERROR))
 521                         pasemi_mac_rx_error(mac, macrx);
 522
 523                 if (!(macrx & XCT_MACRX_O))
 524                         break;
 525
 526                 info = NULL;
 527
 528                 /* We have to scan for our skb since there's no way
 529                  * to back-map them from the descriptor, and if we
 530                  * have several receive channels then they might not
 531                  * show up in the same order as they were put on the
 532                  * interface ring.
 533                  */
 534
 535                 dma = (RX_RING(mac, n+1) & XCT_PTR_ADDR_M);
 536                 for (i = mac->rx->next_to_fill;
 537                      i < (mac->rx->next_to_fill + RX_RING_SIZE);
 538                      i++) {
 539                         info = &RX_RING_INFO(mac, i);
 540                         if (info->dma == dma)
 541                                 break;
 542                 }
 543
 544                 prefetchw(info);
 545
 546                 skb = info->skb;
 547                 prefetchw(skb);
 548                 info->dma = 0;
 549
 550                 pci_unmap_single(mac->dma_pdev, dma, skb->len,
 551                                  PCI_DMA_FROMDEVICE);
 552
 553                 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 554
 555                 if (len < 256) {
 556                         struct sk_buff *new_skb =
 557                             netdev_alloc_skb(mac->netdev, len + NET_IP_ALIGN);
 558                         if (new_skb) {
 559                                 skb_reserve(new_skb, NET_IP_ALIGN);
 560                                 memcpy(new_skb->data, skb->data, len);
 561                                 /* save the skb in buffer_info as good */
 562                                 skb = new_skb;
 563                         }
 564                         /* else just continue with the old one */
 565                 } else
 566                         info->skb = NULL;
 567
 568                 /* Need to zero it out since hardware doesn't, since the
 569                  * replenish loop uses it to tell when it's done.
 570                  */
 571                 RX_BUFF(mac, i) = 0;
 572
 573                 skb_put(skb, len);
 574
 575                 if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
 576                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 577                         skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
 578                                            XCT_MACRX_CSUM_S;
 579                 } else
 580                         skb->ip_summed = CHECKSUM_NONE;
 581
 582                 mac->netdev->stats.rx_bytes += len;
 583                 mac->netdev->stats.rx_packets++;
 584
 585                 skb->protocol = eth_type_trans(skb, mac->netdev);
 586                 netif_receive_skb(skb);
 587
 588                 RX_RING(mac, n) = 0;
 589                 RX_RING(mac, n+1) = 0;
 590
 591                 n += 2;
 592         }
 593
 594         if (n > RX_RING_SIZE) {
 595                 /* Errata 5971 workaround: L2 target of headers */
 596                 write_iob_reg(mac, PAS_IOB_COM_PKTHDRCNT, 0);
 597                 n &= (RX_RING_SIZE-1);
 598         }
 599         mac->rx->next_to_clean = n;
 600         pasemi_mac_replenish_rx_ring(mac->netdev, limit-count);
 601
 602         spin_unlock(&mac->rx->lock);
 603
 604         return count;
 605 }
 606
 607 /* Can't make this too large or we blow the kernel stack limits */
 608 #define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)
 609
 610 static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
 611 {
 612         int i, j;
 613         struct pasemi_mac_buffer *info;
 614         unsigned int start, descr_count, buf_count, limit;
 615         unsigned int total_count;
 616         unsigned long flags;
 617         struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
 618         dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];
 619
 620         total_count = 0;
 621         limit = TX_CLEAN_BATCHSIZE;
 622 restart:
 623         spin_lock_irqsave(&mac->tx->lock, flags);
 624
 625         start = mac->tx->next_to_clean;
 626
 627         buf_count = 0;
 628         descr_count = 0;
 629
 630         for (i = start;
 631              descr_count < limit && i < mac->tx->next_to_fill;
 632              i += buf_count) {
 633                 u64 mactx = TX_RING(mac, i);
 634
 635                 if ((mactx  & XCT_MACTX_E) ||
 636                     (*mac->tx_status & PAS_STATUS_ERROR))
 637                         pasemi_mac_tx_error(mac, mactx);
 638
 639                 if (unlikely(mactx & XCT_MACTX_O))
 640                         /* Not yet transmitted */
 641                         break;
 642
 643                 info = &TX_RING_INFO(mac, i+1);
 644                 skbs[descr_count] = info->skb;
 645
 646                 buf_count = 2 + skb_shinfo(info->skb)->nr_frags;
 647                 for (j = 0; j <= skb_shinfo(info->skb)->nr_frags; j++)
 648                         dmas[descr_count][j] = TX_RING_INFO(mac, i+1+j).dma;
 649
 650
 651                 info->dma = 0;
 652                 TX_RING(mac, i) = 0;
 653                 TX_RING(mac, i+1) = 0;
 654                 TX_RING_INFO(mac, i+1).skb = 0;
 655                 TX_RING_INFO(mac, i+1).dma = 0;
 656
 657                 /* Since we always fill with an even number of entries, make
 658                  * sure we skip any unused one at the end as well.
 659                  */
 660                 if (buf_count & 1)
 661                         buf_count++;
 662                 descr_count++;
 663         }
 664         mac->tx->next_to_clean = i;
 665
 666         spin_unlock_irqrestore(&mac->tx->lock, flags);
 667         netif_wake_queue(mac->netdev);
 668
 669         for (i = 0; i < descr_count; i++)
 670                 pasemi_mac_unmap_tx_skb(mac, skbs[i], dmas[i]);
 671
 672         total_count += descr_count;
 673
 674         /* If the batch was full, try to clean more */
 675         if (descr_count == limit)
 676                 goto restart;
 677
 678         return total_count;
 679 }
 680
 681
 682 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 683 {
 684         struct net_device *dev = data;
 685         struct pasemi_mac *mac = netdev_priv(dev);
 686         unsigned int reg;
 687
 688         if (!(*mac->rx_status & PAS_STATUS_CAUSE_M))
 689                 return IRQ_NONE;
 690
 691         /* Don't reset packet count so it won't fire again but clear
 692          * all others.
 693          */
 694
 695         reg = 0;
 696         if (*mac->rx_status & PAS_STATUS_SOFT)
 697                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
 698         if (*mac->rx_status & PAS_STATUS_ERROR)
 699                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
 700         if (*mac->rx_status & PAS_STATUS_TIMER)
 701                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 702
 703         netif_rx_schedule(dev, &mac->napi);
 704
 705         write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 706
 707         return IRQ_HANDLED;
 708 }
 709
 710 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 711 {
 712         struct net_device *dev = data;
 713         struct pasemi_mac *mac = netdev_priv(dev);
 714         unsigned int reg, pcnt;
 715
 716         if (!(*mac->tx_status & PAS_STATUS_CAUSE_M))
 717                 return IRQ_NONE;
 718
 719         pasemi_mac_clean_tx(mac);
 720
 721         pcnt = *mac->tx_status & PAS_STATUS_PCNT_M;
 722
 723         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
 724
 725         if (*mac->tx_status & PAS_STATUS_SOFT)
 726                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
 727         if (*mac->tx_status & PAS_STATUS_ERROR)
 728                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 729
 730         write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
 731
 732         return IRQ_HANDLED;
 733 }
 734
 735 static void pasemi_adjust_link(struct net_device *dev)
 736 {
 737         struct pasemi_mac *mac = netdev_priv(dev);
 738         int msg;
 739         unsigned int flags;
 740         unsigned int new_flags;
 741
 742         if (!mac->phydev->link) {
 743                 /* If no link, MAC speed settings don't matter. Just report
 744                  * link down and return.
 745                  */
 746                 if (mac->link && netif_msg_link(mac))
 747                         printk(KERN_INFO "%s: Link is down.\n", dev->name);
 748
 749                 netif_carrier_off(dev);
 750                 mac->link = 0;
 751
 752                 return;
 753         } else
 754                 netif_carrier_on(dev);
 755
 756         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 757         new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
 758                               PAS_MAC_CFG_PCFG_TSR_M);
 759
 760         if (!mac->phydev->duplex)
 761                 new_flags |= PAS_MAC_CFG_PCFG_HD;
 762
 763         switch (mac->phydev->speed) {
 764         case 1000:
 765                 new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
 766                              PAS_MAC_CFG_PCFG_TSR_1G;
 767                 break;
 768         case 100:
 769                 new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
 770                              PAS_MAC_CFG_PCFG_TSR_100M;
 771                 break;
 772         case 10:
 773                 new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
 774                              PAS_MAC_CFG_PCFG_TSR_10M;
 775                 break;
 776         default:
 777                 printk("Unsupported speed %d\n", mac->phydev->speed);
 778         }
 779
 780         /* Print on link or speed/duplex change */
 781         msg = mac->link != mac->phydev->link || flags != new_flags;
 782
 783         mac->duplex = mac->phydev->duplex;
 784         mac->speed = mac->phydev->speed;
 785         mac->link = mac->phydev->link;
 786
 787         if (new_flags != flags)
 788                 write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
 789
 790         if (msg && netif_msg_link(mac))
 791                 printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
 792                        dev->name, mac->speed, mac->duplex ? "full" : "half");
 793 }
 794
 795 static int pasemi_mac_phy_init(struct net_device *dev)
 796 {
 797         struct pasemi_mac *mac = netdev_priv(dev);
 798         struct device_node *dn, *phy_dn;
 799         struct phy_device *phydev;
 800         unsigned int phy_id;
 801         const phandle *ph;
 802         const unsigned int *prop;
 803         struct resource r;
 804         int ret;
 805
 806         dn = pci_device_to_OF_node(mac->pdev);
 807         ph = of_get_property(dn, "phy-handle", NULL);
 808         if (!ph)
 809                 return -ENODEV;
 810         phy_dn = of_find_node_by_phandle(*ph);
 811
 812         prop = of_get_property(phy_dn, "reg", NULL);
 813         ret = of_address_to_resource(phy_dn->parent, 0, &r);
 814         if (ret)
 815                 goto err;
 816
 817         phy_id = *prop;
 818         snprintf(mac->phy_id, BUS_ID_SIZE, PHY_ID_FMT, (int)r.start, phy_id);
 819
 820         of_node_put(phy_dn);
 821
 822         mac->link = 0;
 823         mac->speed = 0;
 824         mac->duplex = -1;
 825
 826         phydev = phy_connect(dev, mac->phy_id, &pasemi_adjust_link, 0, PHY_INTERFACE_MODE_SGMII);
 827
 828         if (IS_ERR(phydev)) {
 829                 printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
 830                 return PTR_ERR(phydev);
 831         }
 832
 833         mac->phydev = phydev;
 834
 835         return 0;
 836
 837 err:
 838         of_node_put(phy_dn);
 839         return -ENODEV;
 840 }
 841
 842
 843 static int pasemi_mac_open(struct net_device *dev)
 844 {
 845         struct pasemi_mac *mac = netdev_priv(dev);
 846         int base_irq;
 847         unsigned int flags;
 848         int ret;
 849
 850         /* enable rx section */
 851         write_dma_reg(mac, PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
 852
 853         /* enable tx section */
 854         write_dma_reg(mac, PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
 855
 856         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
 857                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
 858                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
 859
 860         write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
 861
 862         write_iob_reg(mac, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 863                            PAS_IOB_DMA_RXCH_CFG_CNTTH(0));
 864
 865         write_iob_reg(mac, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
 866                            PAS_IOB_DMA_TXCH_CFG_CNTTH(128));
 867
 868         /* Clear out any residual packet count state from firmware */
 869         pasemi_mac_restart_rx_intr(mac);
 870         pasemi_mac_restart_tx_intr(mac);
 871
 872         /* 0xffffff is max value, about 16ms */
 873         write_iob_reg(mac, PAS_IOB_DMA_COM_TIMEOUTCFG,
 874                            PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
 875
 876         ret = pasemi_mac_setup_rx_resources(dev);
 877         if (ret)
 878                 goto out_rx_resources;
 879
 880         ret = pasemi_mac_setup_tx_resources(dev);
 881         if (ret)
 882                 goto out_tx_resources;
 883
 884         write_mac_reg(mac, PAS_MAC_IPC_CHNL,
 885                            PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
 886                            PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
 887
 888         /* enable rx if */
 889         write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 890                            PAS_DMA_RXINT_RCMDSTA_EN);
 891
 892         /* enable rx channel */
 893         write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 894                            PAS_DMA_RXCHAN_CCMDSTA_EN |
 895                            PAS_DMA_RXCHAN_CCMDSTA_DU);
 896
 897         /* enable tx channel */
 898         write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 899                            PAS_DMA_TXCHAN_TCMDSTA_EN);
 900
 901         pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
 902
 903         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 904                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
 905
 906         if (mac->type == MAC_TYPE_GMAC)
 907                 flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 908         else
 909                 flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
 910
 911         /* Enable interface in MAC */
 912         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
 913
 914         ret = pasemi_mac_phy_init(dev);
 915         /* Some configs don't have PHYs (XAUI etc), so don't complain about
 916          * failed init due to -ENODEV.
 917          */
 918         if (ret && ret != -ENODEV)
 919                 dev_warn(&mac->pdev->dev, "phy init failed: %d\n", ret);
 920
 921         netif_start_queue(dev);
 922         napi_enable(&mac->napi);
 923
 924         /* Interrupts are a bit different for our DMA controller: While
 925          * it's got one a regular PCI device header, the interrupt there
 926          * is really the base of the range it's using. Each tx and rx
 927          * channel has it's own interrupt source.
 928          */
 929
 930         base_irq = virq_to_hw(mac->dma_pdev->irq);
 931
 932         mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
 933         mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_txch);
 934
 935         ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
 936                           mac->tx->irq_name, dev);
 937         if (ret) {
 938                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 939                         base_irq + mac->dma_txch, ret);
 940                 goto out_tx_int;
 941         }
 942
 943         ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
 944                           mac->rx->irq_name, dev);
 945         if (ret) {
 946                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 947                         base_irq + 20 + mac->dma_rxch, ret);
 948                 goto out_rx_int;
 949         }
 950
 951         if (mac->phydev)
 952                 phy_start(mac->phydev);
 953
 954         return 0;
 955
 956 out_rx_int:
 957         free_irq(mac->tx_irq, dev);
 958 out_tx_int:
 959         napi_disable(&mac->napi);
 960         netif_stop_queue(dev);
 961         pasemi_mac_free_tx_resources(dev);
 962 out_tx_resources:
 963         pasemi_mac_free_rx_resources(dev);
 964 out_rx_resources:
 965
 966         return ret;
 967 }
 968
 969 #define MAX_RETRIES 5000
 970
 971 static int pasemi_mac_close(struct net_device *dev)
 972 {
 973         struct pasemi_mac *mac = netdev_priv(dev);
 974         unsigned int stat;
 975         int retries;
 976
 977         if (mac->phydev) {
 978                 phy_stop(mac->phydev);
 979                 phy_disconnect(mac->phydev);
 980         }
 981
 982         netif_stop_queue(dev);
 983         napi_disable(&mac->napi);
 984
 985         /* Clean out any pending buffers */
 986         pasemi_mac_clean_tx(mac);
 987         pasemi_mac_clean_rx(mac, RX_RING_SIZE);
 988
 989         /* Disable interface */
 990         write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), PAS_DMA_TXCHAN_TCMDSTA_ST);
 991         write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), PAS_DMA_RXINT_RCMDSTA_ST);
 992         write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), PAS_DMA_RXCHAN_CCMDSTA_ST);
 993
 994         for (retries = 0; retries < MAX_RETRIES; retries++) {
 995                 stat = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
 996                 if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT))
 997                         break;
 998                 cond_resched();
 999         }
1000
1001         if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
1002                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
1003
1004         for (retries = 0; retries < MAX_RETRIES; retries++) {
1005                 stat = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
1006                 if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT))
1007                         break;
1008                 cond_resched();
1009         }
1010
1011         if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
1012                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
1013
1014         for (retries = 0; retries < MAX_RETRIES; retries++) {
1015                 stat = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1016                 if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT))
1017                         break;
1018                 cond_resched();
1019         }
1020
1021         if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
1022                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
1023
1024         /* Then, disable the channel. This must be done separately from
1025          * stopping, since you can't disable when active.
1026          */
1027
1028         write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
1029         write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
1030         write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
1031
1032         free_irq(mac->tx_irq, dev);
1033         free_irq(mac->rx_irq, dev);
1034
1035         /* Free resources */
1036         pasemi_mac_free_rx_resources(dev);
1037         pasemi_mac_free_tx_resources(dev);
1038
1039         return 0;
1040 }
1041
1042 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
1043 {
1044         struct pasemi_mac *mac = netdev_priv(dev);
1045         struct pasemi_mac_txring *txring;
1046         u64 dflags, mactx;
1047         dma_addr_t map[MAX_SKB_FRAGS+1];
1048         unsigned int map_size[MAX_SKB_FRAGS+1];
1049         unsigned long flags;
1050         int i, nfrags;
1051
1052         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
1053
1054         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1055                 const unsigned char *nh = skb_network_header(skb);
1056
1057                 switch (ip_hdr(skb)->protocol) {
1058                 case IPPROTO_TCP:
1059                         dflags |= XCT_MACTX_CSUM_TCP;
1060                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1061                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1062                         break;
1063                 case IPPROTO_UDP:
1064                         dflags |= XCT_MACTX_CSUM_UDP;
1065                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1066                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1067                         break;
1068                 }
1069         }
1070
1071         nfrags = skb_shinfo(skb)->nr_frags;
1072
1073         map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb),
1074                                 PCI_DMA_TODEVICE);
1075         map_size[0] = skb_headlen(skb);
1076         if (dma_mapping_error(map[0]))
1077                 goto out_err_nolock;
1078
1079         for (i = 0; i < nfrags; i++) {
1080                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1081
1082                 map[i+1] = pci_map_page(mac->dma_pdev, frag->page,
1083                                         frag->page_offset, frag->size,
1084                                         PCI_DMA_TODEVICE);
1085                 map_size[i+1] = frag->size;
1086                 if (dma_mapping_error(map[i+1])) {
1087                         nfrags = i;
1088                         goto out_err_nolock;
1089                 }
1090         }
1091
1092         mactx = dflags | XCT_MACTX_LLEN(skb->len);
1093
1094         txring = mac->tx;
1095
1096         spin_lock_irqsave(&txring->lock, flags);
1097
1098         if (RING_AVAIL(txring) <= nfrags+3) {
1099                 spin_unlock_irqrestore(&txring->lock, flags);
1100                 pasemi_mac_clean_tx(mac);
1101                 pasemi_mac_restart_tx_intr(mac);
1102                 spin_lock_irqsave(&txring->lock, flags);
1103
1104                 if (RING_AVAIL(txring) <= nfrags+3) {
1105                         /* Still no room -- stop the queue and wait for tx
1106                          * intr when there's room.
1107                          */
1108                         netif_stop_queue(dev);
1109                         goto out_err;
1110                 }
1111         }
1112
1113         TX_RING(mac, txring->next_to_fill) = mactx;
1114         txring->next_to_fill++;
1115         TX_RING_INFO(mac, txring->next_to_fill).skb = skb;
1116         for (i = 0; i <= nfrags; i++) {
1117                 TX_RING(mac, txring->next_to_fill+i) =
1118                 XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1119                 TX_RING_INFO(mac, txring->next_to_fill+i).dma = map[i];
1120         }
1121
1122         /* We have to add an even number of 8-byte entries to the ring
1123          * even if the last one is unused. That means always an odd number
1124          * of pointers + one mactx descriptor.
1125          */
1126         if (nfrags & 1)
1127                 nfrags++;
1128
1129         txring->next_to_fill += nfrags + 1;
1130
1131
1132         dev->stats.tx_packets++;
1133         dev->stats.tx_bytes += skb->len;
1134
1135         spin_unlock_irqrestore(&txring->lock, flags);
1136
1137         write_dma_reg(mac, PAS_DMA_TXCHAN_INCR(mac->dma_txch), (nfrags+2) >> 1);
1138
1139         return NETDEV_TX_OK;
1140
1141 out_err:
1142         spin_unlock_irqrestore(&txring->lock, flags);
1143 out_err_nolock:
1144         while (nfrags--)
1145                 pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags],
1146                                  PCI_DMA_TODEVICE);
1147
1148         return NETDEV_TX_BUSY;
1149 }
1150
1151 static void pasemi_mac_set_rx_mode(struct net_device *dev)
1152 {
1153         struct pasemi_mac *mac = netdev_priv(dev);
1154         unsigned int flags;
1155
1156         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1157
1158         /* Set promiscuous */
1159         if (dev->flags & IFF_PROMISC)
1160                 flags |= PAS_MAC_CFG_PCFG_PR;
1161         else
1162                 flags &= ~PAS_MAC_CFG_PCFG_PR;
1163
1164         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1165 }
1166
1167
1168 static int pasemi_mac_poll(struct napi_struct *napi, int budget)
1169 {
1170         struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
1171         struct net_device *dev = mac->netdev;
1172         int pkts;
1173
1174         pasemi_mac_clean_tx(mac);
1175         pkts = pasemi_mac_clean_rx(mac, budget);
1176         if (pkts < budget) {
1177                 /* all done, no more packets present */
1178                 netif_rx_complete(dev, napi);
1179
1180                 pasemi_mac_restart_rx_intr(mac);
1181         }
1182         return pkts;
1183 }
1184
1185 static void __iomem * __devinit map_onedev(struct pci_dev *p, int index)
1186 {
1187         struct device_node *dn;
1188         void __iomem *ret;
1189
1190         dn = pci_device_to_OF_node(p);
1191         if (!dn)
1192                 goto fallback;
1193
1194         ret = of_iomap(dn, index);
1195         if (!ret)
1196                 goto fallback;
1197
1198         return ret;
1199 fallback:
1200         /* This is hardcoded and ugly, but we have some firmware versions
1201          * that don't provide the register space in the device tree. Luckily
1202          * they are at well-known locations so we can just do the math here.
1203          */
1204         return ioremap(0xe0000000 + (p->devfn << 12), 0x2000);
1205 }
1206
1207 static int __devinit pasemi_mac_map_regs(struct pasemi_mac *mac)
1208 {
1209         struct resource res;
1210         struct device_node *dn;
1211         int err;
1212
1213         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
1214         if (!mac->dma_pdev) {
1215                 dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
1216                 return -ENODEV;
1217         }
1218
1219         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
1220         if (!mac->iob_pdev) {
1221                 dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
1222                 return -ENODEV;
1223         }
1224
1225         mac->regs = map_onedev(mac->pdev, 0);
1226         mac->dma_regs = map_onedev(mac->dma_pdev, 0);
1227         mac->iob_regs = map_onedev(mac->iob_pdev, 0);
1228
1229         if (!mac->regs || !mac->dma_regs || !mac->iob_regs) {
1230                 dev_err(&mac->pdev->dev, "Can't map registers\n");
1231                 return -ENODEV;
1232         }
1233
1234         /* The dma status structure is located in the I/O bridge, and
1235          * is cache coherent.
1236          */
1237         if (!dma_status) {
1238                 dn = pci_device_to_OF_node(mac->iob_pdev);
1239                 if (dn)
1240                         err = of_address_to_resource(dn, 1, &res);
1241                 if (!dn || err) {
1242                         /* Fallback for old firmware */
1243                         res.start = 0xfd800000;
1244                         res.end = res.start + 0x1000;
1245                 }
1246                 dma_status = __ioremap(res.start, res.end-res.start, 0);
1247         }
1248
1249         return 0;
1250 }
1251
1252 static int __devinit
1253 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1254 {
1255         static int index = 0;
1256         struct net_device *dev;
1257         struct pasemi_mac *mac;
1258         int err;
1259         DECLARE_MAC_BUF(mac_buf);
1260
1261         err = pci_enable_device(pdev);
1262         if (err)
1263                 return err;
1264
1265         dev = alloc_etherdev(sizeof(struct pasemi_mac));
1266         if (dev == NULL) {
1267                 dev_err(&pdev->dev,
1268                         "pasemi_mac: Could not allocate ethernet device.\n");
1269                 err = -ENOMEM;
1270                 goto out_disable_device;
1271         }
1272
1273         pci_set_drvdata(pdev, dev);
1274         SET_NETDEV_DEV(dev, &pdev->dev);
1275
1276         mac = netdev_priv(dev);
1277
1278         mac->pdev = pdev;
1279         mac->netdev = dev;
1280
1281         netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
1282
1283         dev->features = NETIF_F_HW_CSUM | NETIF_F_LLTX | NETIF_F_SG;
1284
1285         /* These should come out of the device tree eventually */
1286         mac->dma_txch = index;
1287         mac->dma_rxch = index;
1288
1289         /* We probe GMAC before XAUI, but the DMA interfaces are
1290          * in XAUI, GMAC order.
1291          */
1292         if (index < 4)
1293                 mac->dma_if = index + 2;
1294         else
1295                 mac->dma_if = index - 4;
1296         index++;
1297
1298         switch (pdev->device) {
1299         case 0xa005:
1300                 mac->type = MAC_TYPE_GMAC;
1301                 break;
1302         case 0xa006:
1303                 mac->type = MAC_TYPE_XAUI;
1304                 break;
1305         default:
1306                 err = -ENODEV;
1307                 goto out;
1308         }
1309
1310         /* get mac addr from device tree */
1311         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1312                 err = -ENODEV;
1313                 goto out;
1314         }
1315         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
1316
1317         dev->open = pasemi_mac_open;
1318         dev->stop = pasemi_mac_close;
1319         dev->hard_start_xmit = pasemi_mac_start_tx;
1320         dev->set_multicast_list = pasemi_mac_set_rx_mode;
1321
1322         err = pasemi_mac_map_regs(mac);
1323         if (err)
1324                 goto out;
1325
1326         mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
1327         mac->tx_status = &dma_status->tx_sta[mac->dma_txch];
1328
1329         mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1330
1331         /* Enable most messages by default */
1332         mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
1333
1334         err = register_netdev(dev);
1335
1336         if (err) {
1337                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1338                         err);
1339                 goto out;
1340         } else if netif_msg_probe(mac)
1341                 printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
1342                        "hw addr %s\n",
1343                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1344                        mac->dma_if, mac->dma_txch, mac->dma_rxch,
1345                        print_mac(mac_buf, dev->dev_addr));
1346
1347         return err;
1348
1349 out:
1350         if (mac->iob_pdev)
1351                 pci_dev_put(mac->iob_pdev);
1352         if (mac->dma_pdev)
1353                 pci_dev_put(mac->dma_pdev);
1354         if (mac->dma_regs)
1355                 iounmap(mac->dma_regs);
1356         if (mac->iob_regs)
1357                 iounmap(mac->iob_regs);
1358         if (mac->regs)
1359                 iounmap(mac->regs);
1360
1361         free_netdev(dev);
1362 out_disable_device:
1363         pci_disable_device(pdev);
1364         return err;
1365
1366 }
1367
1368 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1369 {
1370         struct net_device *netdev = pci_get_drvdata(pdev);
1371         struct pasemi_mac *mac;
1372
1373         if (!netdev)
1374                 return;
1375
1376         mac = netdev_priv(netdev);
1377
1378         unregister_netdev(netdev);
1379
1380         pci_disable_device(pdev);
1381         pci_dev_put(mac->dma_pdev);
1382         pci_dev_put(mac->iob_pdev);
1383
1384         iounmap(mac->regs);
1385         iounmap(mac->dma_regs);
1386         iounmap(mac->iob_regs);
1387
1388         pci_set_drvdata(pdev, NULL);
1389         free_netdev(netdev);
1390 }
1391
1392 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1393         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1394         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1395         { },
1396 };
1397
1398 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1399
1400 static struct pci_driver pasemi_mac_driver = {
1401         .name           = "pasemi_mac",
1402         .id_table       = pasemi_mac_pci_tbl,
1403         .probe          = pasemi_mac_probe,
1404         .remove         = __devexit_p(pasemi_mac_remove),
1405 };
1406
1407 static void __exit pasemi_mac_cleanup_module(void)
1408 {
1409         pci_unregister_driver(&pasemi_mac_driver);
1410         __iounmap(dma_status);
1411         dma_status = NULL;
1412 }
1413
1414 int pasemi_mac_init_module(void)
1415 {
1416         return pci_register_driver(&pasemi_mac_driver);
1417 }
1418
1419 module_init(pasemi_mac_init_module);
1420 module_exit(pasemi_mac_cleanup_module);