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 limit, count;
 309
 310         limit = (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                 limit = RX_RING_SIZE;
 316
 317         if (limit <= 0)
 318                 return;
 319
 320         i = start;
 321         for (count = limit; count; count--) {
 322                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(mac, i);
 323                 u64 *buff = &RX_BUFF(mac, i);
 324                 struct sk_buff *skb;
 325                 dma_addr_t dma;
 326
 327                 /* skb might still be in there for recycle on short receives */
 328                 if (info->skb)
 329                         skb = info->skb;
 330                 else
 331                         skb = dev_alloc_skb(BUF_SIZE);
 332
 333                 if (unlikely(!skb))
 334                         break;
 335
 336                 dma = pci_map_single(mac->dma_pdev, skb->data, skb->len,
 337                                      PCI_DMA_FROMDEVICE);
 338
 339                 if (unlikely(dma_mapping_error(dma))) {
 340                         dev_kfree_skb_irq(info->skb);
 341                         break;
 342                 }
 343
 344                 info->skb = skb;
 345                 info->dma = dma;
 346                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
 347                 i++;
 348         }
 349
 350         wmb();
 351
 352         pci_write_config_dword(mac->dma_pdev,
 353                                PAS_DMA_RXCHAN_INCR(mac->dma_rxch),
 354                                limit - count);
 355         pci_write_config_dword(mac->dma_pdev,
 356                                PAS_DMA_RXINT_INCR(mac->dma_if),
 357                                limit - count);
 358
 359         mac->rx->next_to_fill += limit - count;
 360 }
 361
 362 static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
 363 {
 364         unsigned int reg, stat;
 365         /* Re-enable packet count interrupts: finally
 366          * ack the packet count interrupt we got in rx_intr.
 367          */
 368
 369         pci_read_config_dword(mac->iob_pdev,
 370                               PAS_IOB_DMA_RXCH_STAT(mac->dma_rxch),
 371                               &stat);
 372
 373         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(stat & PAS_IOB_DMA_RXCH_STAT_CNTDEL_M)
 374                 | PAS_IOB_DMA_RXCH_RESET_PINTC;
 375
 376         pci_write_config_dword(mac->iob_pdev,
 377                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch),
 378                                reg);
 379 }
 380
 381 static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
 382 {
 383         unsigned int reg, stat;
 384
 385         /* Re-enable packet count interrupts */
 386         pci_read_config_dword(mac->iob_pdev,
 387                               PAS_IOB_DMA_TXCH_STAT(mac->dma_txch), &stat);
 388
 389         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(stat & PAS_IOB_DMA_TXCH_STAT_CNTDEL_M)
 390                 | PAS_IOB_DMA_TXCH_RESET_PINTC;
 391
 392         pci_write_config_dword(mac->iob_pdev,
 393                                PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
 394 }
 395
 396
 397 static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 398 {
 399         unsigned int n;
 400         int count;
 401         struct pas_dma_xct_descr *dp;
 402         struct pasemi_mac_buffer *info;
 403         struct sk_buff *skb;
 404         unsigned int i, len;
 405         u64 macrx;
 406         dma_addr_t dma;
 407
 408         spin_lock(&mac->rx->lock);
 409
 410         n = mac->rx->next_to_clean;
 411
 412         for (count = limit; count; count--) {
 413
 414                 rmb();
 415
 416                 dp = &RX_DESC(mac, n);
 417                 macrx = dp->macrx;
 418
 419                 if (!(macrx & XCT_MACRX_O))
 420                         break;
 421
 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 (i = n; i < (n + RX_RING_SIZE); i++) {
 434                         info = &RX_DESC_INFO(mac, i);
 435                         if (info->dma == dma)
 436                                 break;
 437                 }
 438
 439                 skb = info->skb;
 440                 info->dma = 0;
 441
 442                 pci_unmap_single(mac->dma_pdev, dma, skb->len,
 443                                  PCI_DMA_FROMDEVICE);
 444
 445                 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 446
 447                 if (len < 256) {
 448                         struct sk_buff *new_skb =
 449                             netdev_alloc_skb(mac->netdev, len + NET_IP_ALIGN);
 450                         if (new_skb) {
 451                                 skb_reserve(new_skb, NET_IP_ALIGN);
 452                                 memcpy(new_skb->data - NET_IP_ALIGN,
 453                                         skb->data - NET_IP_ALIGN,
 454                                         len + NET_IP_ALIGN);
 455                                 /* save the skb in buffer_info as good */
 456                                 skb = new_skb;
 457                         }
 458                         /* else just continue with the old one */
 459                 } else
 460                         info->skb = NULL;
 461
 462                 skb_put(skb, len);
 463
 464                 skb->protocol = eth_type_trans(skb, mac->netdev);
 465
 466                 if ((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) {
 467                         skb->ip_summed = CHECKSUM_COMPLETE;
 468                         skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
 469                                            XCT_MACRX_CSUM_S;
 470                 } else
 471                         skb->ip_summed = CHECKSUM_NONE;
 472
 473                 mac->stats.rx_bytes += len;
 474                 mac->stats.rx_packets++;
 475
 476                 netif_receive_skb(skb);
 477
 478                 dp->ptr = 0;
 479                 dp->macrx = 0;
 480
 481                 n++;
 482         }
 483
 484         mac->rx->next_to_clean += limit - count;
 485         pasemi_mac_replenish_rx_ring(mac->netdev);
 486
 487         spin_unlock(&mac->rx->lock);
 488
 489         return count;
 490 }
 491
 492 static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
 493 {
 494         int i;
 495         struct pasemi_mac_buffer *info;
 496         struct pas_dma_xct_descr *dp;
 497         int start, count;
 498         int flags;
 499
 500         spin_lock_irqsave(&mac->tx->lock, flags);
 501
 502         start = mac->tx->next_to_clean;
 503         count = 0;
 504
 505         for (i = start; i < mac->tx->next_to_use; i++) {
 506                 dp = &TX_DESC(mac, i);
 507                 if (!dp || (dp->mactx & XCT_MACTX_O))
 508                         break;
 509
 510                 count++;
 511
 512                 info = &TX_DESC_INFO(mac, i);
 513
 514                 pci_unmap_single(mac->dma_pdev, info->dma,
 515                                  info->skb->len, PCI_DMA_TODEVICE);
 516                 dev_kfree_skb_irq(info->skb);
 517
 518                 info->skb = NULL;
 519                 info->dma = 0;
 520                 dp->mactx = 0;
 521                 dp->ptr = 0;
 522         }
 523         mac->tx->next_to_clean += count;
 524         spin_unlock_irqrestore(&mac->tx->lock, flags);
 525
 526         netif_wake_queue(mac->netdev);
 527
 528         return count;
 529 }
 530
 531
 532 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 533 {
 534         struct net_device *dev = data;
 535         struct pasemi_mac *mac = netdev_priv(dev);
 536         unsigned int reg;
 537
 538         if (!(*mac->rx_status & PAS_STATUS_CAUSE_M))
 539                 return IRQ_NONE;
 540
 541         if (*mac->rx_status & PAS_STATUS_ERROR)
 542                 printk("rx_status reported error\n");
 543
 544         /* Don't reset packet count so it won't fire again but clear
 545          * all others.
 546          */
 547
 548         pci_read_config_dword(mac->dma_pdev, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), &reg);
 549
 550         reg = 0;
 551         if (*mac->rx_status & PAS_STATUS_SOFT)
 552                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
 553         if (*mac->rx_status & PAS_STATUS_ERROR)
 554                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
 555         if (*mac->rx_status & PAS_STATUS_TIMER)
 556                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 557
 558         netif_rx_schedule(dev);
 559
 560         pci_write_config_dword(mac->iob_pdev,
 561                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 562
 563
 564         return IRQ_HANDLED;
 565 }
 566
 567 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 568 {
 569         struct net_device *dev = data;
 570         struct pasemi_mac *mac = netdev_priv(dev);
 571         unsigned int reg;
 572
 573         if (!(*mac->tx_status & PAS_STATUS_CAUSE_M))
 574                 return IRQ_NONE;
 575
 576         pasemi_mac_clean_tx(mac);
 577
 578         reg = PAS_IOB_DMA_TXCH_RESET_PINTC;
 579
 580         if (*mac->tx_status & PAS_STATUS_SOFT)
 581                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
 582         if (*mac->tx_status & PAS_STATUS_ERROR)
 583                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 584
 585         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch),
 586                                reg);
 587
 588         return IRQ_HANDLED;
 589 }
 590
 591 static int pasemi_mac_open(struct net_device *dev)
 592 {
 593         struct pasemi_mac *mac = netdev_priv(dev);
 594         int base_irq;
 595         unsigned int flags;
 596         int ret;
 597
 598         /* enable rx section */
 599         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_RXCMD,
 600                                PAS_DMA_COM_RXCMD_EN);
 601
 602         /* enable tx section */
 603         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_TXCMD,
 604                                PAS_DMA_COM_TXCMD_EN);
 605
 606         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
 607                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
 608                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
 609
 610         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_TXP, flags);
 611
 612         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 613                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
 614
 615         flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 616
 617         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 618                                PAS_IOB_DMA_RXCH_CFG_CNTTH(1));
 619
 620         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
 621                                PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
 622
 623         /* Clear out any residual packet count state from firmware */
 624         pasemi_mac_restart_rx_intr(mac);
 625         pasemi_mac_restart_tx_intr(mac);
 626
 627         /* 0xffffff is max value, about 16ms */
 628         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 629                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
 630
 631         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 632
 633         ret = pasemi_mac_setup_rx_resources(dev);
 634         if (ret)
 635                 goto out_rx_resources;
 636
 637         ret = pasemi_mac_setup_tx_resources(dev);
 638         if (ret)
 639                 goto out_tx_resources;
 640
 641         pci_write_config_dword(mac->pdev, PAS_MAC_IPC_CHNL,
 642                                PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
 643                                PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
 644
 645         /* enable rx if */
 646         pci_write_config_dword(mac->dma_pdev,
 647                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 648                                PAS_DMA_RXINT_RCMDSTA_EN);
 649
 650         /* enable rx channel */
 651         pci_write_config_dword(mac->dma_pdev,
 652                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 653                                PAS_DMA_RXCHAN_CCMDSTA_EN |
 654                                PAS_DMA_RXCHAN_CCMDSTA_DU);
 655
 656         /* enable tx channel */
 657         pci_write_config_dword(mac->dma_pdev,
 658                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 659                                PAS_DMA_TXCHAN_TCMDSTA_EN);
 660
 661         pasemi_mac_replenish_rx_ring(dev);
 662
 663         netif_start_queue(dev);
 664         netif_poll_enable(dev);
 665
 666         /* Interrupts are a bit different for our DMA controller: While
 667          * it's got one a regular PCI device header, the interrupt there
 668          * is really the base of the range it's using. Each tx and rx
 669          * channel has it's own interrupt source.
 670          */
 671
 672         base_irq = virq_to_hw(mac->dma_pdev->irq);
 673
 674         mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
 675         mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_txch);
 676
 677         ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
 678                           mac->tx->irq_name, dev);
 679         if (ret) {
 680                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 681                         base_irq + mac->dma_txch, ret);
 682                 goto out_tx_int;
 683         }
 684
 685         ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
 686                           mac->rx->irq_name, dev);
 687         if (ret) {
 688                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 689                         base_irq + 20 + mac->dma_rxch, ret);
 690                 goto out_rx_int;
 691         }
 692
 693         return 0;
 694
 695 out_rx_int:
 696         free_irq(mac->tx_irq, dev);
 697 out_tx_int:
 698         netif_poll_disable(dev);
 699         netif_stop_queue(dev);
 700         pasemi_mac_free_tx_resources(dev);
 701 out_tx_resources:
 702         pasemi_mac_free_rx_resources(dev);
 703 out_rx_resources:
 704
 705         return ret;
 706 }
 707
 708 #define MAX_RETRIES 5000
 709
 710 static int pasemi_mac_close(struct net_device *dev)
 711 {
 712         struct pasemi_mac *mac = netdev_priv(dev);
 713         unsigned int stat;
 714         int retries;
 715
 716         netif_stop_queue(dev);
 717
 718         /* Clean out any pending buffers */
 719         pasemi_mac_clean_tx(mac);
 720         pasemi_mac_clean_rx(mac, RX_RING_SIZE);
 721
 722         /* Disable interface */
 723         pci_write_config_dword(mac->dma_pdev,
 724                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 725                                PAS_DMA_TXCHAN_TCMDSTA_ST);
 726         pci_write_config_dword(mac->dma_pdev,
 727                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 728                       PAS_DMA_RXINT_RCMDSTA_ST);
 729         pci_write_config_dword(mac->dma_pdev,
 730                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 731                       PAS_DMA_RXCHAN_CCMDSTA_ST);
 732
 733         for (retries = 0; retries < MAX_RETRIES; retries++) {
 734                 pci_read_config_dword(mac->dma_pdev,
 735                                       PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 736                                       &stat);
 737                 if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT))
 738                         break;
 739                 cond_resched();
 740         }
 741
 742         if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
 743                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
 744
 745         for (retries = 0; retries < MAX_RETRIES; retries++) {
 746                 pci_read_config_dword(mac->dma_pdev,
 747                                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 748                                       &stat);
 749                 if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT))
 750                         break;
 751                 cond_resched();
 752         }
 753
 754         if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
 755                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
 756
 757         for (retries = 0; retries < MAX_RETRIES; retries++) {
 758                 pci_read_config_dword(mac->dma_pdev,
 759                                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 760                                       &stat);
 761                 if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT))
 762                         break;
 763                 cond_resched();
 764         }
 765
 766         if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
 767                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
 768
 769         /* Then, disable the channel. This must be done separately from
 770          * stopping, since you can't disable when active.
 771          */
 772
 773         pci_write_config_dword(mac->dma_pdev,
 774                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
 775         pci_write_config_dword(mac->dma_pdev,
 776                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
 777         pci_write_config_dword(mac->dma_pdev,
 778                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
 779
 780         free_irq(mac->tx_irq, dev);
 781         free_irq(mac->rx_irq, dev);
 782
 783         /* Free resources */
 784         pasemi_mac_free_rx_resources(dev);
 785         pasemi_mac_free_tx_resources(dev);
 786
 787         return 0;
 788 }
 789
 790 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
 791 {
 792         struct pasemi_mac *mac = netdev_priv(dev);
 793         struct pasemi_mac_txring *txring;
 794         struct pasemi_mac_buffer *info;
 795         struct pas_dma_xct_descr *dp;
 796         u64 dflags;
 797         dma_addr_t map;
 798         int flags;
 799
 800         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
 801
 802         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 803                 const unsigned char *nh = skb_network_header(skb);
 804
 805                 switch (ip_hdr(skb)->protocol) {
 806                 case IPPROTO_TCP:
 807                         dflags |= XCT_MACTX_CSUM_TCP;
 808                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 809                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 810                         break;
 811                 case IPPROTO_UDP:
 812                         dflags |= XCT_MACTX_CSUM_UDP;
 813                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 814                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 815                         break;
 816                 }
 817         }
 818
 819         map = pci_map_single(mac->dma_pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
 820
 821         if (dma_mapping_error(map))
 822                 return NETDEV_TX_BUSY;
 823
 824         txring = mac->tx;
 825
 826         spin_lock_irqsave(&txring->lock, flags);
 827
 828         if (txring->next_to_clean - txring->next_to_use == TX_RING_SIZE) {
 829                 spin_unlock_irqrestore(&txring->lock, flags);
 830                 pasemi_mac_clean_tx(mac);
 831                 spin_lock_irqsave(&txring->lock, flags);
 832
 833                 if (txring->next_to_clean - txring->next_to_use ==
 834                     TX_RING_SIZE) {
 835                         /* Still no room -- stop the queue and wait for tx
 836                          * intr when there's room.
 837                          */
 838                         netif_stop_queue(dev);
 839                         goto out_err;
 840                 }
 841         }
 842
 843
 844         dp = &TX_DESC(mac, txring->next_to_use);
 845         info = &TX_DESC_INFO(mac, txring->next_to_use);
 846
 847         dp->mactx = dflags | XCT_MACTX_LLEN(skb->len);
 848         dp->ptr   = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
 849         info->dma = map;
 850         info->skb = skb;
 851
 852         txring->next_to_use++;
 853         mac->stats.tx_packets++;
 854         mac->stats.tx_bytes += skb->len;
 855
 856         spin_unlock_irqrestore(&txring->lock, flags);
 857
 858         pci_write_config_dword(mac->dma_pdev,
 859                                PAS_DMA_TXCHAN_INCR(mac->dma_txch), 1);
 860
 861         return NETDEV_TX_OK;
 862
 863 out_err:
 864         spin_unlock_irqrestore(&txring->lock, flags);
 865         pci_unmap_single(mac->dma_pdev, map, skb->len, PCI_DMA_TODEVICE);
 866         return NETDEV_TX_BUSY;
 867 }
 868
 869 static struct net_device_stats *pasemi_mac_get_stats(struct net_device *dev)
 870 {
 871         struct pasemi_mac *mac = netdev_priv(dev);
 872
 873         return &mac->stats;
 874 }
 875
 876 static void pasemi_mac_set_rx_mode(struct net_device *dev)
 877 {
 878         struct pasemi_mac *mac = netdev_priv(dev);
 879         unsigned int flags;
 880
 881         pci_read_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, &flags);
 882
 883         /* Set promiscuous */
 884         if (dev->flags & IFF_PROMISC)
 885                 flags |= PAS_MAC_CFG_PCFG_PR;
 886         else
 887                 flags &= ~PAS_MAC_CFG_PCFG_PR;
 888
 889         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 890 }
 891
 892
 893 static int pasemi_mac_poll(struct net_device *dev, int *budget)
 894 {
 895         int pkts, limit = min(*budget, dev->quota);
 896         struct pasemi_mac *mac = netdev_priv(dev);
 897
 898         pkts = pasemi_mac_clean_rx(mac, limit);
 899
 900         dev->quota -= pkts;
 901         *budget -= pkts;
 902
 903         if (pkts < limit) {
 904                 /* all done, no more packets present */
 905                 netif_rx_complete(dev);
 906
 907                 pasemi_mac_restart_rx_intr(mac);
 908                 return 0;
 909         } else {
 910                 /* used up our quantum, so reschedule */
 911                 return 1;
 912         }
 913 }
 914
 915 static int __devinit
 916 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 917 {
 918         static int index = 0;
 919         struct net_device *dev;
 920         struct pasemi_mac *mac;
 921         int err;
 922
 923         err = pci_enable_device(pdev);
 924         if (err)
 925                 return err;
 926
 927         dev = alloc_etherdev(sizeof(struct pasemi_mac));
 928         if (dev == NULL) {
 929                 dev_err(&pdev->dev,
 930                         "pasemi_mac: Could not allocate ethernet device.\n");
 931                 err = -ENOMEM;
 932                 goto out_disable_device;
 933         }
 934
 935         SET_MODULE_OWNER(dev);
 936         pci_set_drvdata(pdev, dev);
 937         SET_NETDEV_DEV(dev, &pdev->dev);
 938
 939         mac = netdev_priv(dev);
 940
 941         mac->pdev = pdev;
 942         mac->netdev = dev;
 943         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
 944
 945         if (!mac->dma_pdev) {
 946                 dev_err(&pdev->dev, "Can't find DMA Controller\n");
 947                 err = -ENODEV;
 948                 goto out_free_netdev;
 949         }
 950
 951         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
 952
 953         if (!mac->iob_pdev) {
 954                 dev_err(&pdev->dev, "Can't find I/O Bridge\n");
 955                 err = -ENODEV;
 956                 goto out_put_dma_pdev;
 957         }
 958
 959         /* These should come out of the device tree eventually */
 960         mac->dma_txch = index;
 961         mac->dma_rxch = index;
 962
 963         /* We probe GMAC before XAUI, but the DMA interfaces are
 964          * in XAUI, GMAC order.
 965          */
 966         if (index < 4)
 967                 mac->dma_if = index + 2;
 968         else
 969                 mac->dma_if = index - 4;
 970         index++;
 971
 972         switch (pdev->device) {
 973         case 0xa005:
 974                 mac->type = MAC_TYPE_GMAC;
 975                 break;
 976         case 0xa006:
 977                 mac->type = MAC_TYPE_XAUI;
 978                 break;
 979         default:
 980                 err = -ENODEV;
 981                 goto out;
 982         }
 983
 984         /* get mac addr from device tree */
 985         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
 986                 err = -ENODEV;
 987                 goto out;
 988         }
 989         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
 990
 991         dev->open = pasemi_mac_open;
 992         dev->stop = pasemi_mac_close;
 993         dev->hard_start_xmit = pasemi_mac_start_tx;
 994         dev->get_stats = pasemi_mac_get_stats;
 995         dev->set_multicast_list = pasemi_mac_set_rx_mode;
 996         dev->weight = 64;
 997         dev->poll = pasemi_mac_poll;
 998         dev->features = NETIF_F_HW_CSUM;
 999
1000         /* The dma status structure is located in the I/O bridge, and
1001          * is cache coherent.
1002          */
1003         if (!dma_status)
1004                 /* XXXOJN This should come from the device tree */
1005                 dma_status = __ioremap(0xfd800000, 0x1000, 0);
1006
1007         mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
1008         mac->tx_status = &dma_status->tx_sta[mac->dma_txch];
1009
1010         err = register_netdev(dev);
1011
1012         if (err) {
1013                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1014                         err);
1015                 goto out;
1016         } else
1017                 printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
1018                        "hw addr %02x:%02x:%02x:%02x:%02x:%02x\n",
1019                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1020                        mac->dma_if, mac->dma_txch, mac->dma_rxch,
1021                        dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1022                        dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1023
1024         return err;
1025
1026 out:
1027         pci_dev_put(mac->iob_pdev);
1028 out_put_dma_pdev:
1029         pci_dev_put(mac->dma_pdev);
1030 out_free_netdev:
1031         free_netdev(dev);
1032 out_disable_device:
1033         pci_disable_device(pdev);
1034         return err;
1035
1036 }
1037
1038 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1039 {
1040         struct net_device *netdev = pci_get_drvdata(pdev);
1041         struct pasemi_mac *mac;
1042
1043         if (!netdev)
1044                 return;
1045
1046         mac = netdev_priv(netdev);
1047
1048         unregister_netdev(netdev);
1049
1050         pci_disable_device(pdev);
1051         pci_dev_put(mac->dma_pdev);
1052         pci_dev_put(mac->iob_pdev);
1053
1054         pci_set_drvdata(pdev, NULL);
1055         free_netdev(netdev);
1056 }
1057
1058 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1059         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1060         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1061 };
1062
1063 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1064
1065 static struct pci_driver pasemi_mac_driver = {
1066         .name           = "pasemi_mac",
1067         .id_table       = pasemi_mac_pci_tbl,
1068         .probe          = pasemi_mac_probe,
1069         .remove         = __devexit_p(pasemi_mac_remove),
1070 };
1071
1072 static void __exit pasemi_mac_cleanup_module(void)
1073 {
1074         pci_unregister_driver(&pasemi_mac_driver);
1075         __iounmap(dma_status);
1076         dma_status = NULL;
1077 }
1078
1079 int pasemi_mac_init_module(void)
1080 {
1081         return pci_register_driver(&pasemi_mac_driver);
1082 }
1083
1084 MODULE_LICENSE("GPL");
1085 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
1086 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
1087
1088 module_init(pasemi_mac_init_module);
1089 module_exit(pasemi_mac_cleanup_module);