SAFE public projects git trees. - safe/jmp/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_DESC(mac, num)       ((mac)->tx->desc[(num) & (TX_RING_SIZE-1)])
  67 #define TX_DESC_INFO(mac, num)  ((mac)->tx->desc_info[(num) & (TX_RING_SIZE-1)])
  68 #define RX_DESC(mac, num)       ((mac)->rx->desc[(num) & (RX_RING_SIZE-1)])
  69 #define RX_DESC_INFO(mac, num)  ((mac)->rx->desc_info[(num) & (RX_RING_SIZE-1)])
  70 #define RX_BUFF(mac, num)       ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])
  71
  72 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
  73
  74 MODULE_LICENSE("GPL");
  75 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
  76 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
  77
  78 static int debug = -1;  /* -1 == use DEFAULT_MSG_ENABLE as value */
  79 module_param(debug, int, 0);
  80 MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
  81
  82 static struct pasdma_status *dma_status;
  83
  84 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
  85 {
  86         struct pci_dev *pdev = mac->pdev;
  87         struct device_node *dn = pci_device_to_OF_node(pdev);
  88         const u8 *maddr;
  89         u8 addr[6];
  90
  91         if (!dn) {
  92                 dev_dbg(&pdev->dev,
  93                           "No device node for mac, not configuring\n");
  94                 return -ENOENT;
  95         }
  96
  97         maddr = get_property(dn, "mac-address", NULL);
  98         if (maddr == NULL) {
  99                 dev_warn(&pdev->dev,
 100                          "no mac address in device tree, not configuring\n");
 101                 return -ENOENT;
 102         }
 103
 104         if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
 105                    &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
 106                 dev_warn(&pdev->dev,
 107                          "can't parse mac address, not configuring\n");
 108                 return -EINVAL;
 109         }
 110
 111         memcpy(mac->mac_addr, addr, sizeof(addr));
 112         return 0;
 113 }
 114
 115 static int pasemi_mac_setup_rx_resources(struct net_device *dev)
 116 {
 117         struct pasemi_mac_rxring *ring;
 118         struct pasemi_mac *mac = netdev_priv(dev);
 119         int chan_id = mac->dma_rxch;
 120
 121         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 122
 123         if (!ring)
 124                 goto out_ring;
 125
 126         spin_lock_init(&ring->lock);
 127
 128         ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 129                                   RX_RING_SIZE, GFP_KERNEL);
 130
 131         if (!ring->desc_info)
 132                 goto out_desc_info;
 133
 134         /* Allocate descriptors */
 135         ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
 136                                         RX_RING_SIZE *
 137                                         sizeof(struct pas_dma_xct_descr),
 138                                         &ring->dma, GFP_KERNEL);
 139
 140         if (!ring->desc)
 141                 goto out_desc;
 142
 143         memset(ring->desc, 0, RX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
 144
 145         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
 146                                            RX_RING_SIZE * sizeof(u64),
 147                                            &ring->buf_dma, GFP_KERNEL);
 148         if (!ring->buffers)
 149                 goto out_buffers;
 150
 151         memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
 152
 153         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEL(chan_id),
 154                                PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));
 155
 156         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEU(chan_id),
 157                                PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
 158                                PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 2));
 159
 160         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_CFG(chan_id),
 161                                PAS_DMA_RXCHAN_CFG_HBU(1));
 162
 163         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEL(mac->dma_if),
 164                                PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers)));
 165
 166         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEU(mac->dma_if),
 167                                PAS_DMA_RXINT_BASEU_BRBH(__pa(ring->buffers) >> 32) |
 168                                PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
 169
 170         ring->next_to_fill = 0;
 171         ring->next_to_clean = 0;
 172
 173         snprintf(ring->irq_name, sizeof(ring->irq_name),
 174                  "%s rx", dev->name);
 175         mac->rx = ring;
 176
 177         return 0;
 178
 179 out_buffers:
 180         dma_free_coherent(&mac->dma_pdev->dev,
 181                           RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 182                           mac->rx->desc, mac->rx->dma);
 183 out_desc:
 184         kfree(ring->desc_info);
 185 out_desc_info:
 186         kfree(ring);
 187 out_ring:
 188         return -ENOMEM;
 189 }
 190
 191
 192 static int pasemi_mac_setup_tx_resources(struct net_device *dev)
 193 {
 194         struct pasemi_mac *mac = netdev_priv(dev);
 195         u32 val;
 196         int chan_id = mac->dma_txch;
 197         struct pasemi_mac_txring *ring;
 198
 199         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 200         if (!ring)
 201                 goto out_ring;
 202
 203         spin_lock_init(&ring->lock);
 204
 205         ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 206                                   TX_RING_SIZE, GFP_KERNEL);
 207         if (!ring->desc_info)
 208                 goto out_desc_info;
 209
 210         /* Allocate descriptors */
 211         ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
 212                                         TX_RING_SIZE *
 213                                         sizeof(struct pas_dma_xct_descr),
 214                                         &ring->dma, GFP_KERNEL);
 215         if (!ring->desc)
 216                 goto out_desc;
 217
 218         memset(ring->desc, 0, TX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
 219
 220         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEL(chan_id),
 221                                PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
 222         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
 223         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 2);
 224
 225         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEU(chan_id), val);
 226
 227         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_CFG(chan_id),
 228                                PAS_DMA_TXCHAN_CFG_TY_IFACE |
 229                                PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
 230                                PAS_DMA_TXCHAN_CFG_UP |
 231                                PAS_DMA_TXCHAN_CFG_WT(2));
 232
 233         ring->next_to_use = 0;
 234         ring->next_to_clean = 0;
 235
 236         snprintf(ring->irq_name, sizeof(ring->irq_name),
 237                  "%s tx", dev->name);
 238         mac->tx = ring;
 239
 240         return 0;
 241
 242 out_desc:
 243         kfree(ring->desc_info);
 244 out_desc_info:
 245         kfree(ring);
 246 out_ring:
 247         return -ENOMEM;
 248 }
 249
 250 static void pasemi_mac_free_tx_resources(struct net_device *dev)
 251 {
 252         struct pasemi_mac *mac = netdev_priv(dev);
 253         unsigned int i;
 254         struct pasemi_mac_buffer *info;
 255         struct pas_dma_xct_descr *dp;
 256
 257         for (i = 0; i < TX_RING_SIZE; i++) {
 258                 info = &TX_DESC_INFO(mac, i);
 259                 dp = &TX_DESC(mac, i);
 260                 if (info->dma) {
 261                         if (info->skb) {
 262                                 pci_unmap_single(mac->dma_pdev,
 263                                                  info->dma,
 264                                                  info->skb->len,
 265                                                  PCI_DMA_TODEVICE);
 266                                 dev_kfree_skb_any(info->skb);
 267                         }
 268                         info->dma = 0;
 269                         info->skb = NULL;
 270                         dp->mactx = 0;
 271                         dp->ptr = 0;
 272                 }
 273         }
 274
 275         dma_free_coherent(&mac->dma_pdev->dev,
 276                           TX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 277                           mac->tx->desc, mac->tx->dma);
 278
 279         kfree(mac->tx->desc_info);
 280         kfree(mac->tx);
 281         mac->tx = NULL;
 282 }
 283
 284 static void pasemi_mac_free_rx_resources(struct net_device *dev)
 285 {
 286         struct pasemi_mac *mac = netdev_priv(dev);
 287         unsigned int i;
 288         struct pasemi_mac_buffer *info;
 289         struct pas_dma_xct_descr *dp;
 290
 291         for (i = 0; i < RX_RING_SIZE; i++) {
 292                 info = &RX_DESC_INFO(mac, i);
 293                 dp = &RX_DESC(mac, i);
 294                 if (info->skb) {
 295                         if (info->dma) {
 296                                 pci_unmap_single(mac->dma_pdev,
 297                                                  info->dma,
 298                                                  info->skb->len,
 299                                                  PCI_DMA_FROMDEVICE);
 300                                 dev_kfree_skb_any(info->skb);
 301                         }
 302                         info->dma = 0;
 303                         info->skb = NULL;
 304                         dp->macrx = 0;
 305                         dp->ptr = 0;
 306                 }
 307         }
 308
 309         dma_free_coherent(&mac->dma_pdev->dev,
 310                           RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 311                           mac->rx->desc, mac->rx->dma);
 312
 313         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
 314                           mac->rx->buffers, mac->rx->buf_dma);
 315
 316         kfree(mac->rx->desc_info);
 317         kfree(mac->rx);
 318         mac->rx = NULL;
 319 }
 320
 321 static void pasemi_mac_replenish_rx_ring(struct net_device *dev)
 322 {
 323         struct pasemi_mac *mac = netdev_priv(dev);
 324         unsigned int i;
 325         int start = mac->rx->next_to_fill;
 326         unsigned int limit, count;
 327
 328         limit = (mac->rx->next_to_clean + RX_RING_SIZE -
 329                  mac->rx->next_to_fill) & (RX_RING_SIZE - 1);
 330
 331         /* Check to see if we're doing first-time setup */
 332         if (unlikely(mac->rx->next_to_clean == 0 && mac->rx->next_to_fill == 0))
 333                 limit = RX_RING_SIZE;
 334
 335         if (limit <= 0)
 336                 return;
 337
 338         i = start;
 339         for (count = limit; count; count--) {
 340                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(mac, i);
 341                 u64 *buff = &RX_BUFF(mac, i);
 342                 struct sk_buff *skb;
 343                 dma_addr_t dma;
 344
 345                 /* skb might still be in there for recycle on short receives */
 346                 if (info->skb)
 347                         skb = info->skb;
 348                 else
 349                         skb = dev_alloc_skb(BUF_SIZE);
 350
 351                 if (unlikely(!skb))
 352                         break;
 353
 354                 dma = pci_map_single(mac->dma_pdev, skb->data, skb->len,
 355                                      PCI_DMA_FROMDEVICE);
 356
 357                 if (unlikely(dma_mapping_error(dma))) {
 358                         dev_kfree_skb_irq(info->skb);
 359                         break;
 360                 }
 361
 362                 info->skb = skb;
 363                 info->dma = dma;
 364                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
 365                 i++;
 366         }
 367
 368         wmb();
 369
 370         pci_write_config_dword(mac->dma_pdev,
 371                                PAS_DMA_RXCHAN_INCR(mac->dma_rxch),
 372                                limit - count);
 373         pci_write_config_dword(mac->dma_pdev,
 374                                PAS_DMA_RXINT_INCR(mac->dma_if),
 375                                limit - count);
 376
 377         mac->rx->next_to_fill += limit - count;
 378 }
 379
 380 static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
 381 {
 382         unsigned int reg, stat;
 383         /* Re-enable packet count interrupts: finally
 384          * ack the packet count interrupt we got in rx_intr.
 385          */
 386
 387         pci_read_config_dword(mac->iob_pdev,
 388                               PAS_IOB_DMA_RXCH_STAT(mac->dma_rxch),
 389                               &stat);
 390
 391         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(stat & PAS_IOB_DMA_RXCH_STAT_CNTDEL_M)
 392                 | PAS_IOB_DMA_RXCH_RESET_PINTC;
 393
 394         pci_write_config_dword(mac->iob_pdev,
 395                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch),
 396                                reg);
 397 }
 398
 399 static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
 400 {
 401         unsigned int reg, stat;
 402
 403         /* Re-enable packet count interrupts */
 404         pci_read_config_dword(mac->iob_pdev,
 405                               PAS_IOB_DMA_TXCH_STAT(mac->dma_txch), &stat);
 406
 407         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(stat & PAS_IOB_DMA_TXCH_STAT_CNTDEL_M)
 408                 | PAS_IOB_DMA_TXCH_RESET_PINTC;
 409
 410         pci_write_config_dword(mac->iob_pdev,
 411                                PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
 412 }
 413
 414
 415 static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 416 {
 417         unsigned int n;
 418         int count;
 419         struct pas_dma_xct_descr *dp;
 420         struct pasemi_mac_buffer *info;
 421         struct sk_buff *skb;
 422         unsigned int i, len;
 423         u64 macrx;
 424         dma_addr_t dma;
 425
 426         spin_lock(&mac->rx->lock);
 427
 428         n = mac->rx->next_to_clean;
 429
 430         for (count = limit; count; count--) {
 431
 432                 rmb();
 433
 434                 dp = &RX_DESC(mac, n);
 435                 macrx = dp->macrx;
 436
 437                 if (!(macrx & XCT_MACRX_O))
 438                         break;
 439
 440
 441                 info = NULL;
 442
 443                 /* We have to scan for our skb since there's no way
 444                  * to back-map them from the descriptor, and if we
 445                  * have several receive channels then they might not
 446                  * show up in the same order as they were put on the
 447                  * interface ring.
 448                  */
 449
 450                 dma = (dp->ptr & XCT_PTR_ADDR_M);
 451                 for (i = n; i < (n + RX_RING_SIZE); i++) {
 452                         info = &RX_DESC_INFO(mac, i);
 453                         if (info->dma == dma)
 454                                 break;
 455                 }
 456
 457                 skb = info->skb;
 458                 info->dma = 0;
 459
 460                 pci_unmap_single(mac->dma_pdev, dma, skb->len,
 461                                  PCI_DMA_FROMDEVICE);
 462
 463                 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 464
 465                 if (len < 256) {
 466                         struct sk_buff *new_skb =
 467                             netdev_alloc_skb(mac->netdev, len + NET_IP_ALIGN);
 468                         if (new_skb) {
 469                                 skb_reserve(new_skb, NET_IP_ALIGN);
 470                                 memcpy(new_skb->data - NET_IP_ALIGN,
 471                                         skb->data - NET_IP_ALIGN,
 472                                         len + NET_IP_ALIGN);
 473                                 /* save the skb in buffer_info as good */
 474                                 skb = new_skb;
 475                         }
 476                         /* else just continue with the old one */
 477                 } else
 478                         info->skb = NULL;
 479
 480                 skb_put(skb, len);
 481
 482                 skb->protocol = eth_type_trans(skb, mac->netdev);
 483
 484                 if ((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) {
 485                         skb->ip_summed = CHECKSUM_COMPLETE;
 486                         skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
 487                                            XCT_MACRX_CSUM_S;
 488                 } else
 489                         skb->ip_summed = CHECKSUM_NONE;
 490
 491                 mac->stats.rx_bytes += len;
 492                 mac->stats.rx_packets++;
 493
 494                 netif_receive_skb(skb);
 495
 496                 dp->ptr = 0;
 497                 dp->macrx = 0;
 498
 499                 n++;
 500         }
 501
 502         mac->rx->next_to_clean += limit - count;
 503         pasemi_mac_replenish_rx_ring(mac->netdev);
 504
 505         spin_unlock(&mac->rx->lock);
 506
 507         return count;
 508 }
 509
 510 static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
 511 {
 512         int i;
 513         struct pasemi_mac_buffer *info;
 514         struct pas_dma_xct_descr *dp;
 515         int start, count;
 516         int flags;
 517
 518         spin_lock_irqsave(&mac->tx->lock, flags);
 519
 520         start = mac->tx->next_to_clean;
 521         count = 0;
 522
 523         for (i = start; i < mac->tx->next_to_use; i++) {
 524                 dp = &TX_DESC(mac, i);
 525                 if (!dp || (dp->mactx & XCT_MACTX_O))
 526                         break;
 527
 528                 count++;
 529
 530                 info = &TX_DESC_INFO(mac, i);
 531
 532                 pci_unmap_single(mac->dma_pdev, info->dma,
 533                                  info->skb->len, PCI_DMA_TODEVICE);
 534                 dev_kfree_skb_irq(info->skb);
 535
 536                 info->skb = NULL;
 537                 info->dma = 0;
 538                 dp->mactx = 0;
 539                 dp->ptr = 0;
 540         }
 541         mac->tx->next_to_clean += count;
 542         spin_unlock_irqrestore(&mac->tx->lock, flags);
 543
 544         netif_wake_queue(mac->netdev);
 545
 546         return count;
 547 }
 548
 549
 550 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 551 {
 552         struct net_device *dev = data;
 553         struct pasemi_mac *mac = netdev_priv(dev);
 554         unsigned int reg;
 555
 556         if (!(*mac->rx_status & PAS_STATUS_CAUSE_M))
 557                 return IRQ_NONE;
 558
 559         if (*mac->rx_status & PAS_STATUS_ERROR)
 560                 printk("rx_status reported error\n");
 561
 562         /* Don't reset packet count so it won't fire again but clear
 563          * all others.
 564          */
 565
 566         pci_read_config_dword(mac->dma_pdev, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), &reg);
 567
 568         reg = 0;
 569         if (*mac->rx_status & PAS_STATUS_SOFT)
 570                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
 571         if (*mac->rx_status & PAS_STATUS_ERROR)
 572                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
 573         if (*mac->rx_status & PAS_STATUS_TIMER)
 574                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 575
 576         netif_rx_schedule(dev);
 577
 578         pci_write_config_dword(mac->iob_pdev,
 579                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 580
 581
 582         return IRQ_HANDLED;
 583 }
 584
 585 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 586 {
 587         struct net_device *dev = data;
 588         struct pasemi_mac *mac = netdev_priv(dev);
 589         unsigned int reg;
 590
 591         if (!(*mac->tx_status & PAS_STATUS_CAUSE_M))
 592                 return IRQ_NONE;
 593
 594         pasemi_mac_clean_tx(mac);
 595
 596         reg = PAS_IOB_DMA_TXCH_RESET_PINTC;
 597
 598         if (*mac->tx_status & PAS_STATUS_SOFT)
 599                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
 600         if (*mac->tx_status & PAS_STATUS_ERROR)
 601                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 602
 603         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch),
 604                                reg);
 605
 606         return IRQ_HANDLED;
 607 }
 608
 609 static int pasemi_mac_open(struct net_device *dev)
 610 {
 611         struct pasemi_mac *mac = netdev_priv(dev);
 612         int base_irq;
 613         unsigned int flags;
 614         int ret;
 615
 616         /* enable rx section */
 617         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_RXCMD,
 618                                PAS_DMA_COM_RXCMD_EN);
 619
 620         /* enable tx section */
 621         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_TXCMD,
 622                                PAS_DMA_COM_TXCMD_EN);
 623
 624         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
 625                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
 626                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
 627
 628         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_TXP, flags);
 629
 630         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 631                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
 632
 633         flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 634
 635         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 636                                PAS_IOB_DMA_RXCH_CFG_CNTTH(1));
 637
 638         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
 639                                PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
 640
 641         /* Clear out any residual packet count state from firmware */
 642         pasemi_mac_restart_rx_intr(mac);
 643         pasemi_mac_restart_tx_intr(mac);
 644
 645         /* 0xffffff is max value, about 16ms */
 646         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 647                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
 648
 649         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 650
 651         ret = pasemi_mac_setup_rx_resources(dev);
 652         if (ret)
 653                 goto out_rx_resources;
 654
 655         ret = pasemi_mac_setup_tx_resources(dev);
 656         if (ret)
 657                 goto out_tx_resources;
 658
 659         pci_write_config_dword(mac->pdev, PAS_MAC_IPC_CHNL,
 660                                PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
 661                                PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
 662
 663         /* enable rx if */
 664         pci_write_config_dword(mac->dma_pdev,
 665                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 666                                PAS_DMA_RXINT_RCMDSTA_EN);
 667
 668         /* enable rx channel */
 669         pci_write_config_dword(mac->dma_pdev,
 670                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 671                                PAS_DMA_RXCHAN_CCMDSTA_EN |
 672                                PAS_DMA_RXCHAN_CCMDSTA_DU);
 673
 674         /* enable tx channel */
 675         pci_write_config_dword(mac->dma_pdev,
 676                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 677                                PAS_DMA_TXCHAN_TCMDSTA_EN);
 678
 679         pasemi_mac_replenish_rx_ring(dev);
 680
 681         netif_start_queue(dev);
 682         netif_poll_enable(dev);
 683
 684         /* Interrupts are a bit different for our DMA controller: While
 685          * it's got one a regular PCI device header, the interrupt there
 686          * is really the base of the range it's using. Each tx and rx
 687          * channel has it's own interrupt source.
 688          */
 689
 690         base_irq = virq_to_hw(mac->dma_pdev->irq);
 691
 692         mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
 693         mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_txch);
 694
 695         ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
 696                           mac->tx->irq_name, dev);
 697         if (ret) {
 698                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 699                         base_irq + mac->dma_txch, ret);
 700                 goto out_tx_int;
 701         }
 702
 703         ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
 704                           mac->rx->irq_name, dev);
 705         if (ret) {
 706                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 707                         base_irq + 20 + mac->dma_rxch, ret);
 708                 goto out_rx_int;
 709         }
 710
 711         return 0;
 712
 713 out_rx_int:
 714         free_irq(mac->tx_irq, dev);
 715 out_tx_int:
 716         netif_poll_disable(dev);
 717         netif_stop_queue(dev);
 718         pasemi_mac_free_tx_resources(dev);
 719 out_tx_resources:
 720         pasemi_mac_free_rx_resources(dev);
 721 out_rx_resources:
 722
 723         return ret;
 724 }
 725
 726 #define MAX_RETRIES 5000
 727
 728 static int pasemi_mac_close(struct net_device *dev)
 729 {
 730         struct pasemi_mac *mac = netdev_priv(dev);
 731         unsigned int stat;
 732         int retries;
 733
 734         netif_stop_queue(dev);
 735
 736         /* Clean out any pending buffers */
 737         pasemi_mac_clean_tx(mac);
 738         pasemi_mac_clean_rx(mac, RX_RING_SIZE);
 739
 740         /* Disable interface */
 741         pci_write_config_dword(mac->dma_pdev,
 742                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 743                                PAS_DMA_TXCHAN_TCMDSTA_ST);
 744         pci_write_config_dword(mac->dma_pdev,
 745                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 746                       PAS_DMA_RXINT_RCMDSTA_ST);
 747         pci_write_config_dword(mac->dma_pdev,
 748                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 749                       PAS_DMA_RXCHAN_CCMDSTA_ST);
 750
 751         for (retries = 0; retries < MAX_RETRIES; retries++) {
 752                 pci_read_config_dword(mac->dma_pdev,
 753                                       PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 754                                       &stat);
 755                 if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT))
 756                         break;
 757                 cond_resched();
 758         }
 759
 760         if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
 761                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
 762
 763         for (retries = 0; retries < MAX_RETRIES; retries++) {
 764                 pci_read_config_dword(mac->dma_pdev,
 765                                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 766                                       &stat);
 767                 if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT))
 768                         break;
 769                 cond_resched();
 770         }
 771
 772         if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
 773                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
 774
 775         for (retries = 0; retries < MAX_RETRIES; retries++) {
 776                 pci_read_config_dword(mac->dma_pdev,
 777                                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 778                                       &stat);
 779                 if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT))
 780                         break;
 781                 cond_resched();
 782         }
 783
 784         if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
 785                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
 786
 787         /* Then, disable the channel. This must be done separately from
 788          * stopping, since you can't disable when active.
 789          */
 790
 791         pci_write_config_dword(mac->dma_pdev,
 792                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
 793         pci_write_config_dword(mac->dma_pdev,
 794                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
 795         pci_write_config_dword(mac->dma_pdev,
 796                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
 797
 798         free_irq(mac->tx_irq, dev);
 799         free_irq(mac->rx_irq, dev);
 800
 801         /* Free resources */
 802         pasemi_mac_free_rx_resources(dev);
 803         pasemi_mac_free_tx_resources(dev);
 804
 805         return 0;
 806 }
 807
 808 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
 809 {
 810         struct pasemi_mac *mac = netdev_priv(dev);
 811         struct pasemi_mac_txring *txring;
 812         struct pasemi_mac_buffer *info;
 813         struct pas_dma_xct_descr *dp;
 814         u64 dflags;
 815         dma_addr_t map;
 816         int flags;
 817
 818         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
 819
 820         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 821                 const unsigned char *nh = skb_network_header(skb);
 822
 823                 switch (ip_hdr(skb)->protocol) {
 824                 case IPPROTO_TCP:
 825                         dflags |= XCT_MACTX_CSUM_TCP;
 826                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 827                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 828                         break;
 829                 case IPPROTO_UDP:
 830                         dflags |= XCT_MACTX_CSUM_UDP;
 831                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 832                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 833                         break;
 834                 }
 835         }
 836
 837         map = pci_map_single(mac->dma_pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
 838
 839         if (dma_mapping_error(map))
 840                 return NETDEV_TX_BUSY;
 841
 842         txring = mac->tx;
 843
 844         spin_lock_irqsave(&txring->lock, flags);
 845
 846         if (txring->next_to_clean - txring->next_to_use == TX_RING_SIZE) {
 847                 spin_unlock_irqrestore(&txring->lock, flags);
 848                 pasemi_mac_clean_tx(mac);
 849                 spin_lock_irqsave(&txring->lock, flags);
 850
 851                 if (txring->next_to_clean - txring->next_to_use ==
 852                     TX_RING_SIZE) {
 853                         /* Still no room -- stop the queue and wait for tx
 854                          * intr when there's room.
 855                          */
 856                         netif_stop_queue(dev);
 857                         goto out_err;
 858                 }
 859         }
 860
 861
 862         dp = &TX_DESC(mac, txring->next_to_use);
 863         info = &TX_DESC_INFO(mac, txring->next_to_use);
 864
 865         dp->mactx = dflags | XCT_MACTX_LLEN(skb->len);
 866         dp->ptr   = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
 867         info->dma = map;
 868         info->skb = skb;
 869
 870         txring->next_to_use++;
 871         mac->stats.tx_packets++;
 872         mac->stats.tx_bytes += skb->len;
 873
 874         spin_unlock_irqrestore(&txring->lock, flags);
 875
 876         pci_write_config_dword(mac->dma_pdev,
 877                                PAS_DMA_TXCHAN_INCR(mac->dma_txch), 1);
 878
 879         return NETDEV_TX_OK;
 880
 881 out_err:
 882         spin_unlock_irqrestore(&txring->lock, flags);
 883         pci_unmap_single(mac->dma_pdev, map, skb->len, PCI_DMA_TODEVICE);
 884         return NETDEV_TX_BUSY;
 885 }
 886
 887 static struct net_device_stats *pasemi_mac_get_stats(struct net_device *dev)
 888 {
 889         struct pasemi_mac *mac = netdev_priv(dev);
 890
 891         return &mac->stats;
 892 }
 893
 894
 895 static void pasemi_mac_set_rx_mode(struct net_device *dev)
 896 {
 897         struct pasemi_mac *mac = netdev_priv(dev);
 898         unsigned int flags;
 899
 900         pci_read_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, &flags);
 901
 902         /* Set promiscuous */
 903         if (dev->flags & IFF_PROMISC)
 904                 flags |= PAS_MAC_CFG_PCFG_PR;
 905         else
 906                 flags &= ~PAS_MAC_CFG_PCFG_PR;
 907
 908         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 909 }
 910
 911
 912 static int pasemi_mac_poll(struct net_device *dev, int *budget)
 913 {
 914         int pkts, limit = min(*budget, dev->quota);
 915         struct pasemi_mac *mac = netdev_priv(dev);
 916
 917         pkts = pasemi_mac_clean_rx(mac, limit);
 918
 919         dev->quota -= pkts;
 920         *budget -= pkts;
 921
 922         if (pkts < limit) {
 923                 /* all done, no more packets present */
 924                 netif_rx_complete(dev);
 925
 926                 pasemi_mac_restart_rx_intr(mac);
 927                 return 0;
 928         } else {
 929                 /* used up our quantum, so reschedule */
 930                 return 1;
 931         }
 932 }
 933
 934 static int __devinit
 935 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 936 {
 937         static int index = 0;
 938         struct net_device *dev;
 939         struct pasemi_mac *mac;
 940         int err;
 941
 942         err = pci_enable_device(pdev);
 943         if (err)
 944                 return err;
 945
 946         dev = alloc_etherdev(sizeof(struct pasemi_mac));
 947         if (dev == NULL) {
 948                 dev_err(&pdev->dev,
 949                         "pasemi_mac: Could not allocate ethernet device.\n");
 950                 err = -ENOMEM;
 951                 goto out_disable_device;
 952         }
 953
 954         SET_MODULE_OWNER(dev);
 955         pci_set_drvdata(pdev, dev);
 956         SET_NETDEV_DEV(dev, &pdev->dev);
 957
 958         mac = netdev_priv(dev);
 959
 960         mac->pdev = pdev;
 961         mac->netdev = dev;
 962         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
 963
 964         if (!mac->dma_pdev) {
 965                 dev_err(&pdev->dev, "Can't find DMA Controller\n");
 966                 err = -ENODEV;
 967                 goto out_free_netdev;
 968         }
 969
 970         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
 971
 972         if (!mac->iob_pdev) {
 973                 dev_err(&pdev->dev, "Can't find I/O Bridge\n");
 974                 err = -ENODEV;
 975                 goto out_put_dma_pdev;
 976         }
 977
 978         /* These should come out of the device tree eventually */
 979         mac->dma_txch = index;
 980         mac->dma_rxch = index;
 981
 982         /* We probe GMAC before XAUI, but the DMA interfaces are
 983          * in XAUI, GMAC order.
 984          */
 985         if (index < 4)
 986                 mac->dma_if = index + 2;
 987         else
 988                 mac->dma_if = index - 4;
 989         index++;
 990
 991         switch (pdev->device) {
 992         case 0xa005:
 993                 mac->type = MAC_TYPE_GMAC;
 994                 break;
 995         case 0xa006:
 996                 mac->type = MAC_TYPE_XAUI;
 997                 break;
 998         default:
 999                 err = -ENODEV;
1000                 goto out;
1001         }
1002
1003         /* get mac addr from device tree */
1004         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1005                 err = -ENODEV;
1006                 goto out;
1007         }
1008         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
1009
1010         dev->open = pasemi_mac_open;
1011         dev->stop = pasemi_mac_close;
1012         dev->hard_start_xmit = pasemi_mac_start_tx;
1013         dev->get_stats = pasemi_mac_get_stats;
1014         dev->set_multicast_list = pasemi_mac_set_rx_mode;
1015         dev->weight = 64;
1016         dev->poll = pasemi_mac_poll;
1017         dev->features = NETIF_F_HW_CSUM;
1018
1019         /* The dma status structure is located in the I/O bridge, and
1020          * is cache coherent.
1021          */
1022         if (!dma_status)
1023                 /* XXXOJN This should come from the device tree */
1024                 dma_status = __ioremap(0xfd800000, 0x1000, 0);
1025
1026         mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
1027         mac->tx_status = &dma_status->tx_sta[mac->dma_txch];
1028
1029         mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1030
1031         err = register_netdev(dev);
1032
1033         if (err) {
1034                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1035                         err);
1036                 goto out;
1037         } else
1038                 printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
1039                        "hw addr %02x:%02x:%02x:%02x:%02x:%02x\n",
1040                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1041                        mac->dma_if, mac->dma_txch, mac->dma_rxch,
1042                        dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1043                        dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1044
1045         return err;
1046
1047 out:
1048         pci_dev_put(mac->iob_pdev);
1049 out_put_dma_pdev:
1050         pci_dev_put(mac->dma_pdev);
1051 out_free_netdev:
1052         free_netdev(dev);
1053 out_disable_device:
1054         pci_disable_device(pdev);
1055         return err;
1056
1057 }
1058
1059 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1060 {
1061         struct net_device *netdev = pci_get_drvdata(pdev);
1062         struct pasemi_mac *mac;
1063
1064         if (!netdev)
1065                 return;
1066
1067         mac = netdev_priv(netdev);
1068
1069         unregister_netdev(netdev);
1070
1071         pci_disable_device(pdev);
1072         pci_dev_put(mac->dma_pdev);
1073         pci_dev_put(mac->iob_pdev);
1074
1075         pci_set_drvdata(pdev, NULL);
1076         free_netdev(netdev);
1077 }
1078
1079 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1080         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1081         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1082 };
1083
1084 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1085
1086 static struct pci_driver pasemi_mac_driver = {
1087         .name           = "pasemi_mac",
1088         .id_table       = pasemi_mac_pci_tbl,
1089         .probe          = pasemi_mac_probe,
1090         .remove         = __devexit_p(pasemi_mac_remove),
1091 };
1092
1093 static void __exit pasemi_mac_cleanup_module(void)
1094 {
1095         pci_unregister_driver(&pasemi_mac_driver);
1096         __iounmap(dma_status);
1097         dma_status = NULL;
1098 }
1099
1100 int pasemi_mac_init_module(void)
1101 {
1102         return pci_register_driver(&pasemi_mac_driver);
1103 }
1104
1105 module_init(pasemi_mac_init_module);
1106 module_exit(pasemi_mac_cleanup_module);