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 TX_DESC(mac, num)       ((mac)->tx->desc[(num) & (TX_RING_SIZE-1)])
  57 #define TX_DESC_INFO(mac, num)  ((mac)->tx->desc_info[(num) & (TX_RING_SIZE-1)])
  58 #define RX_DESC(mac, num)       ((mac)->rx->desc[(num) & (RX_RING_SIZE-1)])
  59 #define RX_DESC_INFO(mac, num)  ((mac)->rx->desc_info[(num) & (RX_RING_SIZE-1)])
  60 #define RX_BUFF(mac, num)       ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])
  61
  62 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
  63
  64 static struct pasdma_status *dma_status;
  65
  66 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
  67 {
  68         struct pci_dev *pdev = mac->pdev;
  69         struct device_node *dn = pci_device_to_OF_node(pdev);
  70         const u8 *maddr;
  71         u8 addr[6];
  72
  73         if (!dn) {
  74                 dev_dbg(&pdev->dev,
  75                           "No device node for mac, not configuring\n");
  76                 return -ENOENT;
  77         }
  78
  79         maddr = get_property(dn, "mac-address", NULL);
  80         if (maddr == NULL) {
  81                 dev_warn(&pdev->dev,
  82                          "no mac address in device tree, not configuring\n");
  83                 return -ENOENT;
  84         }
  85
  86         if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
  87                    &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
  88                 dev_warn(&pdev->dev,
  89                          "can't parse mac address, not configuring\n");
  90                 return -EINVAL;
  91         }
  92
  93         memcpy(mac->mac_addr, addr, sizeof(addr));
  94         return 0;
  95 }
  96
  97 static int pasemi_mac_setup_rx_resources(struct net_device *dev)
  98 {
  99         struct pasemi_mac_rxring *ring;
 100         struct pasemi_mac *mac = netdev_priv(dev);
 101         int chan_id = mac->dma_rxch;
 102
 103         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 104
 105         if (!ring)
 106                 goto out_ring;
 107
 108         spin_lock_init(&ring->lock);
 109
 110         ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 111                                   RX_RING_SIZE, GFP_KERNEL);
 112
 113         if (!ring->desc_info)
 114                 goto out_desc_info;
 115
 116         /* Allocate descriptors */
 117         ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
 118                                         RX_RING_SIZE *
 119                                         sizeof(struct pas_dma_xct_descr),
 120                                         &ring->dma, GFP_KERNEL);
 121
 122         if (!ring->desc)
 123                 goto out_desc;
 124
 125         memset(ring->desc, 0, RX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
 126
 127         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
 128                                            RX_RING_SIZE * sizeof(u64),
 129                                            &ring->buf_dma, GFP_KERNEL);
 130         if (!ring->buffers)
 131                 goto out_buffers;
 132
 133         memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
 134
 135         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEL(chan_id),
 136                                PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));
 137
 138         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEU(chan_id),
 139                                PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
 140                                PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 2));
 141
 142         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_CFG(chan_id),
 143                                PAS_DMA_RXCHAN_CFG_HBU(1));
 144
 145         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEL(mac->dma_if),
 146                                PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers)));
 147
 148         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEU(mac->dma_if),
 149                                PAS_DMA_RXINT_BASEU_BRBH(__pa(ring->buffers) >> 32) |
 150                                PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
 151
 152         ring->next_to_fill = 0;
 153         ring->next_to_clean = 0;
 154
 155         snprintf(ring->irq_name, sizeof(ring->irq_name),
 156                  "%s rx", dev->name);
 157         mac->rx = ring;
 158
 159         return 0;
 160
 161 out_buffers:
 162         dma_free_coherent(&mac->dma_pdev->dev,
 163                           RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 164                           mac->rx->desc, mac->rx->dma);
 165 out_desc:
 166         kfree(ring->desc_info);
 167 out_desc_info:
 168         kfree(ring);
 169 out_ring:
 170         return -ENOMEM;
 171 }
 172
 173
 174 static int pasemi_mac_setup_tx_resources(struct net_device *dev)
 175 {
 176         struct pasemi_mac *mac = netdev_priv(dev);
 177         u32 val;
 178         int chan_id = mac->dma_txch;
 179         struct pasemi_mac_txring *ring;
 180
 181         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 182         if (!ring)
 183                 goto out_ring;
 184
 185         spin_lock_init(&ring->lock);
 186
 187         ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 188                                   TX_RING_SIZE, GFP_KERNEL);
 189         if (!ring->desc_info)
 190                 goto out_desc_info;
 191
 192         /* Allocate descriptors */
 193         ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
 194                                         TX_RING_SIZE *
 195                                         sizeof(struct pas_dma_xct_descr),
 196                                         &ring->dma, GFP_KERNEL);
 197         if (!ring->desc)
 198                 goto out_desc;
 199
 200         memset(ring->desc, 0, TX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
 201
 202         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEL(chan_id),
 203                                PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
 204         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
 205         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 2);
 206
 207         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEU(chan_id), val);
 208
 209         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_CFG(chan_id),
 210                                PAS_DMA_TXCHAN_CFG_TY_IFACE |
 211                                PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
 212                                PAS_DMA_TXCHAN_CFG_UP |
 213                                PAS_DMA_TXCHAN_CFG_WT(2));
 214
 215         ring->next_to_use = 0;
 216         ring->next_to_clean = 0;
 217
 218         snprintf(ring->irq_name, sizeof(ring->irq_name),
 219                  "%s tx", dev->name);
 220         mac->tx = ring;
 221
 222         return 0;
 223
 224 out_desc:
 225         kfree(ring->desc_info);
 226 out_desc_info:
 227         kfree(ring);
 228 out_ring:
 229         return -ENOMEM;
 230 }
 231
 232 static void pasemi_mac_free_tx_resources(struct net_device *dev)
 233 {
 234         struct pasemi_mac *mac = netdev_priv(dev);
 235         unsigned int i;
 236         struct pasemi_mac_buffer *info;
 237         struct pas_dma_xct_descr *dp;
 238
 239         for (i = 0; i < TX_RING_SIZE; i++) {
 240                 info = &TX_DESC_INFO(mac, i);
 241                 dp = &TX_DESC(mac, i);
 242                 if (info->dma) {
 243                         if (info->skb) {
 244                                 pci_unmap_single(mac->dma_pdev,
 245                                                  info->dma,
 246                                                  info->skb->len,
 247                                                  PCI_DMA_TODEVICE);
 248                                 dev_kfree_skb_any(info->skb);
 249                         }
 250                         info->dma = 0;
 251                         info->skb = NULL;
 252                         dp->mactx = 0;
 253                         dp->ptr = 0;
 254                 }
 255         }
 256
 257         dma_free_coherent(&mac->dma_pdev->dev,
 258                           TX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 259                           mac->tx->desc, mac->tx->dma);
 260
 261         kfree(mac->tx->desc_info);
 262         kfree(mac->tx);
 263         mac->tx = NULL;
 264 }
 265
 266 static void pasemi_mac_free_rx_resources(struct net_device *dev)
 267 {
 268         struct pasemi_mac *mac = netdev_priv(dev);
 269         unsigned int i;
 270         struct pasemi_mac_buffer *info;
 271         struct pas_dma_xct_descr *dp;
 272
 273         for (i = 0; i < RX_RING_SIZE; i++) {
 274                 info = &RX_DESC_INFO(mac, i);
 275                 dp = &RX_DESC(mac, i);
 276                 if (info->skb) {
 277                         if (info->dma) {
 278                                 pci_unmap_single(mac->dma_pdev,
 279                                                  info->dma,
 280                                                  info->skb->len,
 281                                                  PCI_DMA_FROMDEVICE);
 282                                 dev_kfree_skb_any(info->skb);
 283                         }
 284                         info->dma = 0;
 285                         info->skb = NULL;
 286                         dp->macrx = 0;
 287                         dp->ptr = 0;
 288                 }
 289         }
 290
 291         dma_free_coherent(&mac->dma_pdev->dev,
 292                           RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 293                           mac->rx->desc, mac->rx->dma);
 294
 295         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
 296                           mac->rx->buffers, mac->rx->buf_dma);
 297
 298         kfree(mac->rx->desc_info);
 299         kfree(mac->rx);
 300         mac->rx = NULL;
 301 }
 302
 303 static void pasemi_mac_replenish_rx_ring(struct net_device *dev)
 304 {
 305         struct pasemi_mac *mac = netdev_priv(dev);
 306         unsigned int i;
 307         int start = mac->rx->next_to_fill;
 308         unsigned int count;
 309
 310         count = (mac->rx->next_to_clean + RX_RING_SIZE -
 311                  mac->rx->next_to_fill) & (RX_RING_SIZE - 1);
 312
 313         /* Check to see if we're doing first-time setup */
 314         if (unlikely(mac->rx->next_to_clean == 0 && mac->rx->next_to_fill == 0))
 315                 count = RX_RING_SIZE;
 316
 317         if (count <= 0)
 318                 return;
 319
 320         for (i = start; i < start + count; i++) {
 321                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(mac, i);
 322                 u64 *buff = &RX_BUFF(mac, i);
 323                 struct sk_buff *skb;
 324                 dma_addr_t dma;
 325
 326                 /* skb might still be in there for recycle on short receives */
 327                 if (info->skb)
 328                         skb = info->skb;
 329                 else
 330                         skb = dev_alloc_skb(BUF_SIZE);
 331
 332                 if (unlikely(!skb))
 333                         break;
 334
 335                 dma = pci_map_single(mac->dma_pdev, skb->data, skb->len,
 336                                      PCI_DMA_FROMDEVICE);
 337
 338                 if (dma_mapping_error(dma)) {
 339                         dev_kfree_skb_irq(info->skb);
 340                         count = i - start;
 341                         break;
 342                 }
 343
 344                 info->skb = skb;
 345                 info->dma = dma;
 346                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
 347         }
 348
 349         wmb();
 350
 351         pci_write_config_dword(mac->dma_pdev,
 352                                PAS_DMA_RXCHAN_INCR(mac->dma_rxch),
 353                                count);
 354         pci_write_config_dword(mac->dma_pdev,
 355                                PAS_DMA_RXINT_INCR(mac->dma_if),
 356                                count);
 357
 358         mac->rx->next_to_fill += count;
 359 }
 360
 361 static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
 362 {
 363         unsigned int reg, stat;
 364         /* Re-enable packet count interrupts: finally
 365          * ack the packet count interrupt we got in rx_intr.
 366          */
 367
 368         pci_read_config_dword(mac->iob_pdev,
 369                               PAS_IOB_DMA_RXCH_STAT(mac->dma_rxch),
 370                               &stat);
 371
 372         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(stat & PAS_IOB_DMA_RXCH_STAT_CNTDEL_M)
 373                 | PAS_IOB_DMA_RXCH_RESET_PINTC;
 374
 375         pci_write_config_dword(mac->iob_pdev,
 376                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch),
 377                                reg);
 378 }
 379
 380 static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
 381 {
 382         unsigned int reg, stat;
 383
 384         /* Re-enable packet count interrupts */
 385         pci_read_config_dword(mac->iob_pdev,
 386                               PAS_IOB_DMA_TXCH_STAT(mac->dma_txch), &stat);
 387
 388         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(stat & PAS_IOB_DMA_TXCH_STAT_CNTDEL_M)
 389                 | PAS_IOB_DMA_TXCH_RESET_PINTC;
 390
 391         pci_write_config_dword(mac->iob_pdev,
 392                                PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
 393 }
 394
 395
 396
 397 static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 398 {
 399         unsigned int i;
 400         int start, count;
 401
 402         spin_lock(&mac->rx->lock);
 403
 404         start = mac->rx->next_to_clean;
 405         count = 0;
 406
 407         for (i = start; i < (start + RX_RING_SIZE) && count < limit; i++) {
 408                 struct pas_dma_xct_descr *dp;
 409                 struct pasemi_mac_buffer *info;
 410                 struct sk_buff *skb;
 411                 unsigned int j, len;
 412                 dma_addr_t dma;
 413
 414                 rmb();
 415
 416                 dp = &RX_DESC(mac, i);
 417
 418                 if (!(dp->macrx & XCT_MACRX_O))
 419                         break;
 420
 421                 count++;
 422
 423                 info = NULL;
 424
 425                 /* We have to scan for our skb since there's no way
 426                  * to back-map them from the descriptor, and if we
 427                  * have several receive channels then they might not
 428                  * show up in the same order as they were put on the
 429                  * interface ring.
 430                  */
 431
 432                 dma = (dp->ptr & XCT_PTR_ADDR_M);
 433                 for (j = start; j < (start + RX_RING_SIZE); j++) {
 434                         info = &RX_DESC_INFO(mac, j);
 435                         if (info->dma == dma)
 436                                 break;
 437                 }
 438
 439                 BUG_ON(!info);
 440                 BUG_ON(info->dma != dma);
 441                 skb = info->skb;
 442
 443                 pci_unmap_single(mac->dma_pdev, info->dma, info->skb->len,
 444                                  PCI_DMA_FROMDEVICE);
 445                 info->dma = 0;
 446
 447
 448                 len = (dp->macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 449                 if (len < 256) {
 450                         struct sk_buff *new_skb =
 451                             netdev_alloc_skb(mac->netdev, len + NET_IP_ALIGN);
 452                         if (new_skb) {
 453                                 skb_reserve(new_skb, NET_IP_ALIGN);
 454                                 memcpy(new_skb->data - NET_IP_ALIGN,
 455                                         skb->data - NET_IP_ALIGN,
 456                                         len + NET_IP_ALIGN);
 457                                 /* save the skb in buffer_info as good */
 458                                 skb = new_skb;
 459                         }
 460                         /* else just continue with the old one */
 461                 } else
 462                         info->skb = NULL;
 463
 464                 skb_put(skb, len);
 465
 466                 skb->protocol = eth_type_trans(skb, mac->netdev);
 467
 468                 if ((dp->macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) {
 469                         skb->ip_summed = CHECKSUM_COMPLETE;
 470                         skb->csum = (dp->macrx & XCT_MACRX_CSUM_M) >>
 471                                            XCT_MACRX_CSUM_S;
 472                 } else
 473                         skb->ip_summed = CHECKSUM_NONE;
 474
 475                 mac->stats.rx_bytes += len;
 476                 mac->stats.rx_packets++;
 477
 478                 netif_receive_skb(skb);
 479
 480                 info->dma = 0;
 481                 info->skb = NULL;
 482                 dp->ptr = 0;
 483                 dp->macrx = 0;
 484         }
 485
 486         mac->rx->next_to_clean += count;
 487         pasemi_mac_replenish_rx_ring(mac->netdev);
 488
 489         spin_unlock(&mac->rx->lock);
 490
 491         return count;
 492 }
 493
 494 static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
 495 {
 496         int i;
 497         struct pasemi_mac_buffer *info;
 498         struct pas_dma_xct_descr *dp;
 499         int start, count;
 500         int flags;
 501
 502         spin_lock_irqsave(&mac->tx->lock, flags);
 503
 504         start = mac->tx->next_to_clean;
 505         count = 0;
 506
 507         for (i = start; i < mac->tx->next_to_use; i++) {
 508                 dp = &TX_DESC(mac, i);
 509                 if (!dp || (dp->mactx & XCT_MACTX_O))
 510                         break;
 511
 512                 count++;
 513
 514                 info = &TX_DESC_INFO(mac, i);
 515
 516                 pci_unmap_single(mac->dma_pdev, info->dma,
 517                                  info->skb->len, PCI_DMA_TODEVICE);
 518                 dev_kfree_skb_irq(info->skb);
 519
 520                 info->skb = NULL;
 521                 info->dma = 0;
 522                 dp->mactx = 0;
 523                 dp->ptr = 0;
 524         }
 525         mac->tx->next_to_clean += count;
 526         spin_unlock_irqrestore(&mac->tx->lock, flags);
 527
 528         netif_wake_queue(mac->netdev);
 529
 530         return count;
 531 }
 532
 533
 534 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 535 {
 536         struct net_device *dev = data;
 537         struct pasemi_mac *mac = netdev_priv(dev);
 538         unsigned int reg;
 539
 540         if (!(*mac->rx_status & PAS_STATUS_CAUSE_M))
 541                 return IRQ_NONE;
 542
 543         if (*mac->rx_status & PAS_STATUS_ERROR)
 544                 printk("rx_status reported error\n");
 545
 546         /* Don't reset packet count so it won't fire again but clear
 547          * all others.
 548          */
 549
 550         pci_read_config_dword(mac->dma_pdev, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), &reg);
 551
 552         reg = 0;
 553         if (*mac->rx_status & PAS_STATUS_SOFT)
 554                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
 555         if (*mac->rx_status & PAS_STATUS_ERROR)
 556                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
 557         if (*mac->rx_status & PAS_STATUS_TIMER)
 558                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 559
 560         netif_rx_schedule(dev);
 561
 562         pci_write_config_dword(mac->iob_pdev,
 563                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 564
 565
 566         return IRQ_HANDLED;
 567 }
 568
 569 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 570 {
 571         struct net_device *dev = data;
 572         struct pasemi_mac *mac = netdev_priv(dev);
 573         unsigned int reg;
 574
 575         if (!(*mac->tx_status & PAS_STATUS_CAUSE_M))
 576                 return IRQ_NONE;
 577
 578         pasemi_mac_clean_tx(mac);
 579
 580         reg = PAS_IOB_DMA_TXCH_RESET_PINTC;
 581
 582         if (*mac->tx_status & PAS_STATUS_SOFT)
 583                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
 584         if (*mac->tx_status & PAS_STATUS_ERROR)
 585                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 586
 587         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch),
 588                                reg);
 589
 590         return IRQ_HANDLED;
 591 }
 592
 593 static int pasemi_mac_open(struct net_device *dev)
 594 {
 595         struct pasemi_mac *mac = netdev_priv(dev);
 596         int base_irq;
 597         unsigned int flags;
 598         int ret;
 599
 600         /* enable rx section */
 601         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_RXCMD,
 602                                PAS_DMA_COM_RXCMD_EN);
 603
 604         /* enable tx section */
 605         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_TXCMD,
 606                                PAS_DMA_COM_TXCMD_EN);
 607
 608         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
 609                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
 610                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
 611
 612         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_TXP, flags);
 613
 614         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 615                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
 616
 617         flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 618
 619         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 620                                PAS_IOB_DMA_RXCH_CFG_CNTTH(1));
 621
 622         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
 623                                PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
 624
 625         /* Clear out any residual packet count state from firmware */
 626         pasemi_mac_restart_rx_intr(mac);
 627         pasemi_mac_restart_tx_intr(mac);
 628
 629         /* 0xffffff is max value, about 16ms */
 630         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 631                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
 632
 633         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 634
 635         ret = pasemi_mac_setup_rx_resources(dev);
 636         if (ret)
 637                 goto out_rx_resources;
 638
 639         ret = pasemi_mac_setup_tx_resources(dev);
 640         if (ret)
 641                 goto out_tx_resources;
 642
 643         pci_write_config_dword(mac->pdev, PAS_MAC_IPC_CHNL,
 644                                PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
 645                                PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
 646
 647         /* enable rx if */
 648         pci_write_config_dword(mac->dma_pdev,
 649                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 650                                PAS_DMA_RXINT_RCMDSTA_EN);
 651
 652         /* enable rx channel */
 653         pci_write_config_dword(mac->dma_pdev,
 654                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 655                                PAS_DMA_RXCHAN_CCMDSTA_EN |
 656                                PAS_DMA_RXCHAN_CCMDSTA_DU);
 657
 658         /* enable tx channel */
 659         pci_write_config_dword(mac->dma_pdev,
 660                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 661                                PAS_DMA_TXCHAN_TCMDSTA_EN);
 662
 663         pasemi_mac_replenish_rx_ring(dev);
 664
 665         netif_start_queue(dev);
 666         netif_poll_enable(dev);
 667
 668         /* Interrupts are a bit different for our DMA controller: While
 669          * it's got one a regular PCI device header, the interrupt there
 670          * is really the base of the range it's using. Each tx and rx
 671          * channel has it's own interrupt source.
 672          */
 673
 674         base_irq = virq_to_hw(mac->dma_pdev->irq);
 675
 676         mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
 677         mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_txch);
 678
 679         ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
 680                           mac->tx->irq_name, dev);
 681         if (ret) {
 682                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 683                         base_irq + mac->dma_txch, ret);
 684                 goto out_tx_int;
 685         }
 686
 687         ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
 688                           mac->rx->irq_name, dev);
 689         if (ret) {
 690                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 691                         base_irq + 20 + mac->dma_rxch, ret);
 692                 goto out_rx_int;
 693         }
 694
 695         return 0;
 696
 697 out_rx_int:
 698         free_irq(mac->tx_irq, dev);
 699 out_tx_int:
 700         netif_poll_disable(dev);
 701         netif_stop_queue(dev);
 702         pasemi_mac_free_tx_resources(dev);
 703 out_tx_resources:
 704         pasemi_mac_free_rx_resources(dev);
 705 out_rx_resources:
 706
 707         return ret;
 708 }
 709
 710 #define MAX_RETRIES 5000
 711
 712 static int pasemi_mac_close(struct net_device *dev)
 713 {
 714         struct pasemi_mac *mac = netdev_priv(dev);
 715         unsigned int stat;
 716         int retries;
 717
 718         netif_stop_queue(dev);
 719
 720         /* Clean out any pending buffers */
 721         pasemi_mac_clean_tx(mac);
 722         pasemi_mac_clean_rx(mac, RX_RING_SIZE);
 723
 724         /* Disable interface */
 725         pci_write_config_dword(mac->dma_pdev,
 726                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 727                                PAS_DMA_TXCHAN_TCMDSTA_ST);
 728         pci_write_config_dword(mac->dma_pdev,
 729                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 730                       PAS_DMA_RXINT_RCMDSTA_ST);
 731         pci_write_config_dword(mac->dma_pdev,
 732                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 733                       PAS_DMA_RXCHAN_CCMDSTA_ST);
 734
 735         for (retries = 0; retries < MAX_RETRIES; retries++) {
 736                 pci_read_config_dword(mac->dma_pdev,
 737                                       PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 738                                       &stat);
 739                 if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT))
 740                         break;
 741                 cond_resched();
 742         }
 743
 744         if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
 745                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
 746
 747         for (retries = 0; retries < MAX_RETRIES; retries++) {
 748                 pci_read_config_dword(mac->dma_pdev,
 749                                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 750                                       &stat);
 751                 if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT))
 752                         break;
 753                 cond_resched();
 754         }
 755
 756         if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
 757                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
 758
 759         for (retries = 0; retries < MAX_RETRIES; retries++) {
 760                 pci_read_config_dword(mac->dma_pdev,
 761                                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 762                                       &stat);
 763                 if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT))
 764                         break;
 765                 cond_resched();
 766         }
 767
 768         if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
 769                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
 770
 771         /* Then, disable the channel. This must be done separately from
 772          * stopping, since you can't disable when active.
 773          */
 774
 775         pci_write_config_dword(mac->dma_pdev,
 776                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
 777         pci_write_config_dword(mac->dma_pdev,
 778                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
 779         pci_write_config_dword(mac->dma_pdev,
 780                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
 781
 782         free_irq(mac->tx_irq, dev);
 783         free_irq(mac->rx_irq, dev);
 784
 785         /* Free resources */
 786         pasemi_mac_free_rx_resources(dev);
 787         pasemi_mac_free_tx_resources(dev);
 788
 789         return 0;
 790 }
 791
 792 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
 793 {
 794         struct pasemi_mac *mac = netdev_priv(dev);
 795         struct pasemi_mac_txring *txring;
 796         struct pasemi_mac_buffer *info;
 797         struct pas_dma_xct_descr *dp;
 798         u64 dflags;
 799         dma_addr_t map;
 800         int flags;
 801
 802         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
 803
 804         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 805                 const unsigned char *nh = skb_network_header(skb);
 806
 807                 switch (ip_hdr(skb)->protocol) {
 808                 case IPPROTO_TCP:
 809                         dflags |= XCT_MACTX_CSUM_TCP;
 810                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 811                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 812                         break;
 813                 case IPPROTO_UDP:
 814                         dflags |= XCT_MACTX_CSUM_UDP;
 815                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 816                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 817                         break;
 818                 }
 819         }
 820
 821         map = pci_map_single(mac->dma_pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
 822
 823         if (dma_mapping_error(map))
 824                 return NETDEV_TX_BUSY;
 825
 826         txring = mac->tx;
 827
 828         spin_lock_irqsave(&txring->lock, flags);
 829
 830         if (txring->next_to_clean - txring->next_to_use == TX_RING_SIZE) {
 831                 spin_unlock_irqrestore(&txring->lock, flags);
 832                 pasemi_mac_clean_tx(mac);
 833                 spin_lock_irqsave(&txring->lock, flags);
 834
 835                 if (txring->next_to_clean - txring->next_to_use ==
 836                     TX_RING_SIZE) {
 837                         /* Still no room -- stop the queue and wait for tx
 838                          * intr when there's room.
 839                          */
 840                         netif_stop_queue(dev);
 841                         goto out_err;
 842                 }
 843         }
 844
 845
 846         dp = &TX_DESC(mac, txring->next_to_use);
 847         info = &TX_DESC_INFO(mac, txring->next_to_use);
 848
 849         dp->mactx = dflags | XCT_MACTX_LLEN(skb->len);
 850         dp->ptr   = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
 851         info->dma = map;
 852         info->skb = skb;
 853
 854         txring->next_to_use++;
 855         mac->stats.tx_packets++;
 856         mac->stats.tx_bytes += skb->len;
 857
 858         spin_unlock_irqrestore(&txring->lock, flags);
 859
 860         pci_write_config_dword(mac->dma_pdev,
 861                                PAS_DMA_TXCHAN_INCR(mac->dma_txch), 1);
 862
 863         return NETDEV_TX_OK;
 864
 865 out_err:
 866         spin_unlock_irqrestore(&txring->lock, flags);
 867         pci_unmap_single(mac->dma_pdev, map, skb->len, PCI_DMA_TODEVICE);
 868         return NETDEV_TX_BUSY;
 869 }
 870
 871 static struct net_device_stats *pasemi_mac_get_stats(struct net_device *dev)
 872 {
 873         struct pasemi_mac *mac = netdev_priv(dev);
 874
 875         return &mac->stats;
 876 }
 877
 878 static void pasemi_mac_set_rx_mode(struct net_device *dev)
 879 {
 880         struct pasemi_mac *mac = netdev_priv(dev);
 881         unsigned int flags;
 882
 883         pci_read_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, &flags);
 884
 885         /* Set promiscuous */
 886         if (dev->flags & IFF_PROMISC)
 887                 flags |= PAS_MAC_CFG_PCFG_PR;
 888         else
 889                 flags &= ~PAS_MAC_CFG_PCFG_PR;
 890
 891         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 892 }
 893
 894
 895 static int pasemi_mac_poll(struct net_device *dev, int *budget)
 896 {
 897         int pkts, limit = min(*budget, dev->quota);
 898         struct pasemi_mac *mac = netdev_priv(dev);
 899
 900         pkts = pasemi_mac_clean_rx(mac, limit);
 901
 902         if (pkts < limit) {
 903                 /* all done, no more packets present */
 904                 netif_rx_complete(dev);
 905
 906                 pasemi_mac_restart_rx_intr(mac);
 907                 return 0;
 908         } else {
 909                 /* used up our quantum, so reschedule */
 910                 dev->quota -= pkts;
 911                 *budget -= pkts;
 912                 return 1;
 913         }
 914 }
 915
 916 static int __devinit
 917 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 918 {
 919         static int index = 0;
 920         struct net_device *dev;
 921         struct pasemi_mac *mac;
 922         int err;
 923
 924         err = pci_enable_device(pdev);
 925         if (err)
 926                 return err;
 927
 928         dev = alloc_etherdev(sizeof(struct pasemi_mac));
 929         if (dev == NULL) {
 930                 dev_err(&pdev->dev,
 931                         "pasemi_mac: Could not allocate ethernet device.\n");
 932                 err = -ENOMEM;
 933                 goto out_disable_device;
 934         }
 935
 936         SET_MODULE_OWNER(dev);
 937         pci_set_drvdata(pdev, dev);
 938         SET_NETDEV_DEV(dev, &pdev->dev);
 939
 940         mac = netdev_priv(dev);
 941
 942         mac->pdev = pdev;
 943         mac->netdev = dev;
 944         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
 945
 946         if (!mac->dma_pdev) {
 947                 dev_err(&pdev->dev, "Can't find DMA Controller\n");
 948                 err = -ENODEV;
 949                 goto out_free_netdev;
 950         }
 951
 952         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
 953
 954         if (!mac->iob_pdev) {
 955                 dev_err(&pdev->dev, "Can't find I/O Bridge\n");
 956                 err = -ENODEV;
 957                 goto out_put_dma_pdev;
 958         }
 959
 960         /* These should come out of the device tree eventually */
 961         mac->dma_txch = index;
 962         mac->dma_rxch = index;
 963
 964         /* We probe GMAC before XAUI, but the DMA interfaces are
 965          * in XAUI, GMAC order.
 966          */
 967         if (index < 4)
 968                 mac->dma_if = index + 2;
 969         else
 970                 mac->dma_if = index - 4;
 971         index++;
 972
 973         switch (pdev->device) {
 974         case 0xa005:
 975                 mac->type = MAC_TYPE_GMAC;
 976                 break;
 977         case 0xa006:
 978                 mac->type = MAC_TYPE_XAUI;
 979                 break;
 980         default:
 981                 err = -ENODEV;
 982                 goto out;
 983         }
 984
 985         /* get mac addr from device tree */
 986         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
 987                 err = -ENODEV;
 988                 goto out;
 989         }
 990         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
 991
 992         dev->open = pasemi_mac_open;
 993         dev->stop = pasemi_mac_close;
 994         dev->hard_start_xmit = pasemi_mac_start_tx;
 995         dev->get_stats = pasemi_mac_get_stats;
 996         dev->set_multicast_list = pasemi_mac_set_rx_mode;
 997         dev->weight = 64;
 998         dev->poll = pasemi_mac_poll;
 999         dev->features = NETIF_F_HW_CSUM;
1000
1001         /* The dma status structure is located in the I/O bridge, and
1002          * is cache coherent.
1003          */
1004         if (!dma_status)
1005                 /* XXXOJN This should come from the device tree */
1006                 dma_status = __ioremap(0xfd800000, 0x1000, 0);
1007
1008         mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
1009         mac->tx_status = &dma_status->tx_sta[mac->dma_txch];
1010
1011         err = register_netdev(dev);
1012
1013         if (err) {
1014                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1015                         err);
1016                 goto out;
1017         } else
1018                 printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
1019                        "hw addr %02x:%02x:%02x:%02x:%02x:%02x\n",
1020                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1021                        mac->dma_if, mac->dma_txch, mac->dma_rxch,
1022                        dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1023                        dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1024
1025         return err;
1026
1027 out:
1028         pci_dev_put(mac->iob_pdev);
1029 out_put_dma_pdev:
1030         pci_dev_put(mac->dma_pdev);
1031 out_free_netdev:
1032         free_netdev(dev);
1033 out_disable_device:
1034         pci_disable_device(pdev);
1035         return err;
1036
1037 }
1038
1039 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1040 {
1041         struct net_device *netdev = pci_get_drvdata(pdev);
1042         struct pasemi_mac *mac;
1043
1044         if (!netdev)
1045                 return;
1046
1047         mac = netdev_priv(netdev);
1048
1049         unregister_netdev(netdev);
1050
1051         pci_disable_device(pdev);
1052         pci_dev_put(mac->dma_pdev);
1053         pci_dev_put(mac->iob_pdev);
1054
1055         pci_set_drvdata(pdev, NULL);
1056         free_netdev(netdev);
1057 }
1058
1059 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1060         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1061         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1062 };
1063
1064 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1065
1066 static struct pci_driver pasemi_mac_driver = {
1067         .name           = "pasemi_mac",
1068         .id_table       = pasemi_mac_pci_tbl,
1069         .probe          = pasemi_mac_probe,
1070         .remove         = __devexit_p(pasemi_mac_remove),
1071 };
1072
1073 static void __exit pasemi_mac_cleanup_module(void)
1074 {
1075         pci_unregister_driver(&pasemi_mac_driver);
1076         __iounmap(dma_status);
1077         dma_status = NULL;
1078 }
1079
1080 int pasemi_mac_init_module(void)
1081 {
1082         return pci_register_driver(&pasemi_mac_driver);
1083 }
1084
1085 MODULE_LICENSE("GPL");
1086 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
1087 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
1088
1089 module_init(pasemi_mac_init_module);
1090 module_exit(pasemi_mac_cleanup_module);