git.oblomov.eu Git - linux-2.6/blob - drivers/net/pasemi_mac.c

   1 /*
   2  * Copyright (C) 2006-2007 PA Semi, Inc
   3  *
   4  * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/dmaengine.h>
  25 #include <linux/delay.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <asm/dma-mapping.h>
  29 #include <linux/in.h>
  30 #include <linux/skbuff.h>
  31
  32 #include <linux/ip.h>
  33 #include <linux/tcp.h>
  34 #include <net/checksum.h>
  35
  36 #include "pasemi_mac.h"
  37
  38
  39 /* TODO list
  40  *
  41  * - Get rid of pci_{read,write}_config(), map registers with ioremap
  42  *   for performance
  43  * - PHY support
  44  * - Multicast support
  45  * - Large MTU support
  46  * - Other performance improvements
  47  */
  48
  49
  50 /* Must be a power of two */
  51 #define RX_RING_SIZE 512
  52 #define TX_RING_SIZE 512
  53
  54 #define TX_DESC(mac, num)       ((mac)->tx->desc[(num) & (TX_RING_SIZE-1)])
  55 #define TX_DESC_INFO(mac, num)  ((mac)->tx->desc_info[(num) & (TX_RING_SIZE-1)])
  56 #define RX_DESC(mac, num)       ((mac)->rx->desc[(num) & (RX_RING_SIZE-1)])
  57 #define RX_DESC_INFO(mac, num)  ((mac)->rx->desc_info[(num) & (RX_RING_SIZE-1)])
  58 #define RX_BUFF(mac, num)       ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])
  59
  60 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
  61
  62 /* XXXOJN these should come out of the device tree some day */
  63 #define PAS_DMA_CAP_BASE   0xe00d0040
  64 #define PAS_DMA_CAP_SIZE   0x100
  65 #define PAS_DMA_COM_BASE   0xe00d0100
  66 #define PAS_DMA_COM_SIZE   0x100
  67
  68 static struct pasdma_status *dma_status;
  69
  70 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
  71 {
  72         struct pci_dev *pdev = mac->pdev;
  73         struct device_node *dn = pci_device_to_OF_node(pdev);
  74         const u8 *maddr;
  75         u8 addr[6];
  76
  77         if (!dn) {
  78                 dev_dbg(&pdev->dev,
  79                           "No device node for mac, not configuring\n");
  80                 return -ENOENT;
  81         }
  82
  83         maddr = get_property(dn, "mac-address", NULL);
  84         if (maddr == NULL) {
  85                 dev_warn(&pdev->dev,
  86                          "no mac address in device tree, not configuring\n");
  87                 return -ENOENT;
  88         }
  89
  90         if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
  91                    &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
  92                 dev_warn(&pdev->dev,
  93                          "can't parse mac address, not configuring\n");
  94                 return -EINVAL;
  95         }
  96
  97         memcpy(mac->mac_addr, addr, sizeof(addr));
  98         return 0;
  99 }
 100
 101 static int pasemi_mac_setup_rx_resources(struct net_device *dev)
 102 {
 103         struct pasemi_mac_rxring *ring;
 104         struct pasemi_mac *mac = netdev_priv(dev);
 105         int chan_id = mac->dma_rxch;
 106
 107         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 108
 109         if (!ring)
 110                 goto out_ring;
 111
 112         spin_lock_init(&ring->lock);
 113
 114         ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 115                                   RX_RING_SIZE, GFP_KERNEL);
 116
 117         if (!ring->desc_info)
 118                 goto out_desc_info;
 119
 120         /* Allocate descriptors */
 121         ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
 122                                         RX_RING_SIZE *
 123                                         sizeof(struct pas_dma_xct_descr),
 124                                         &ring->dma, GFP_KERNEL);
 125
 126         if (!ring->desc)
 127                 goto out_desc;
 128
 129         memset(ring->desc, 0, RX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
 130
 131         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
 132                                            RX_RING_SIZE * sizeof(u64),
 133                                            &ring->buf_dma, GFP_KERNEL);
 134         if (!ring->buffers)
 135                 goto out_buffers;
 136
 137         memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
 138
 139         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEL(chan_id),
 140                                PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));
 141
 142         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEU(chan_id),
 143                                PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
 144                                PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 2));
 145
 146         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_CFG(chan_id),
 147                                PAS_DMA_RXCHAN_CFG_HBU(1));
 148
 149         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEL(mac->dma_if),
 150                                PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers)));
 151
 152         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEU(mac->dma_if),
 153                                PAS_DMA_RXINT_BASEU_BRBH(__pa(ring->buffers) >> 32) |
 154                                PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
 155
 156         ring->next_to_fill = 0;
 157         ring->next_to_clean = 0;
 158
 159         snprintf(ring->irq_name, sizeof(ring->irq_name),
 160                  "%s rx", dev->name);
 161         mac->rx = ring;
 162
 163         return 0;
 164
 165 out_buffers:
 166         dma_free_coherent(&mac->dma_pdev->dev,
 167                           RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 168                           mac->rx->desc, mac->rx->dma);
 169 out_desc:
 170         kfree(ring->desc_info);
 171 out_desc_info:
 172         kfree(ring);
 173 out_ring:
 174         return -ENOMEM;
 175 }
 176
 177
 178 static int pasemi_mac_setup_tx_resources(struct net_device *dev)
 179 {
 180         struct pasemi_mac *mac = netdev_priv(dev);
 181         u32 val;
 182         int chan_id = mac->dma_txch;
 183         struct pasemi_mac_txring *ring;
 184
 185         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 186         if (!ring)
 187                 goto out_ring;
 188
 189         spin_lock_init(&ring->lock);
 190
 191         ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 192                                   TX_RING_SIZE, GFP_KERNEL);
 193         if (!ring->desc_info)
 194                 goto out_desc_info;
 195
 196         /* Allocate descriptors */
 197         ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
 198                                         TX_RING_SIZE *
 199                                         sizeof(struct pas_dma_xct_descr),
 200                                         &ring->dma, GFP_KERNEL);
 201         if (!ring->desc)
 202                 goto out_desc;
 203
 204         memset(ring->desc, 0, TX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
 205
 206         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEL(chan_id),
 207                                PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
 208         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
 209         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 2);
 210
 211         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEU(chan_id), val);
 212
 213         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_CFG(chan_id),
 214                                PAS_DMA_TXCHAN_CFG_TY_IFACE |
 215                                PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
 216                                PAS_DMA_TXCHAN_CFG_UP |
 217                                PAS_DMA_TXCHAN_CFG_WT(2));
 218
 219         ring->next_to_use = 0;
 220         ring->next_to_clean = 0;
 221
 222         snprintf(ring->irq_name, sizeof(ring->irq_name),
 223                  "%s tx", dev->name);
 224         mac->tx = ring;
 225
 226         return 0;
 227
 228 out_desc:
 229         kfree(ring->desc_info);
 230 out_desc_info:
 231         kfree(ring);
 232 out_ring:
 233         return -ENOMEM;
 234 }
 235
 236 static void pasemi_mac_free_tx_resources(struct net_device *dev)
 237 {
 238         struct pasemi_mac *mac = netdev_priv(dev);
 239         unsigned int i;
 240         struct pasemi_mac_buffer *info;
 241         struct pas_dma_xct_descr *dp;
 242
 243         for (i = 0; i < TX_RING_SIZE; i++) {
 244                 info = &TX_DESC_INFO(mac, i);
 245                 dp = &TX_DESC(mac, i);
 246                 if (info->dma) {
 247                         if (info->skb) {
 248                                 pci_unmap_single(mac->dma_pdev,
 249                                                  info->dma,
 250                                                  info->skb->len,
 251                                                  PCI_DMA_TODEVICE);
 252                                 dev_kfree_skb_any(info->skb);
 253                         }
 254                         info->dma = 0;
 255                         info->skb = NULL;
 256                         dp->mactx = 0;
 257                         dp->ptr = 0;
 258                 }
 259         }
 260
 261         dma_free_coherent(&mac->dma_pdev->dev,
 262                           TX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 263                           mac->tx->desc, mac->tx->dma);
 264
 265         kfree(mac->tx->desc_info);
 266         kfree(mac->tx);
 267         mac->tx = NULL;
 268 }
 269
 270 static void pasemi_mac_free_rx_resources(struct net_device *dev)
 271 {
 272         struct pasemi_mac *mac = netdev_priv(dev);
 273         unsigned int i;
 274         struct pasemi_mac_buffer *info;
 275         struct pas_dma_xct_descr *dp;
 276
 277         for (i = 0; i < RX_RING_SIZE; i++) {
 278                 info = &RX_DESC_INFO(mac, i);
 279                 dp = &RX_DESC(mac, i);
 280                 if (info->dma) {
 281                         if (info->skb) {
 282                                 pci_unmap_single(mac->dma_pdev,
 283                                                  info->dma,
 284                                                  info->skb->len,
 285                                                  PCI_DMA_FROMDEVICE);
 286                                 dev_kfree_skb_any(info->skb);
 287                         }
 288                         info->dma = 0;
 289                         info->skb = NULL;
 290                         dp->macrx = 0;
 291                         dp->ptr = 0;
 292                 }
 293         }
 294
 295         dma_free_coherent(&mac->dma_pdev->dev,
 296                           RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 297                           mac->rx->desc, mac->rx->dma);
 298
 299         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
 300                           mac->rx->buffers, mac->rx->buf_dma);
 301
 302         kfree(mac->rx->desc_info);
 303         kfree(mac->rx);
 304         mac->rx = NULL;
 305 }
 306
 307 static void pasemi_mac_replenish_rx_ring(struct net_device *dev)
 308 {
 309         struct pasemi_mac *mac = netdev_priv(dev);
 310         unsigned int i;
 311         int start = mac->rx->next_to_fill;
 312         unsigned int count;
 313
 314         count = (mac->rx->next_to_clean + RX_RING_SIZE -
 315                  mac->rx->next_to_fill) & (RX_RING_SIZE - 1);
 316
 317         /* Check to see if we're doing first-time setup */
 318         if (unlikely(mac->rx->next_to_clean == 0 && mac->rx->next_to_fill == 0))
 319                 count = RX_RING_SIZE;
 320
 321         if (count <= 0)
 322                 return;
 323
 324         for (i = start; i < start + count; i++) {
 325                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(mac, i);
 326                 u64 *buff = &RX_BUFF(mac, i);
 327                 struct sk_buff *skb;
 328                 dma_addr_t dma;
 329
 330                 skb = dev_alloc_skb(BUF_SIZE);
 331
 332                 if (!skb) {
 333                         count = i - start;
 334                         break;
 335                 }
 336
 337                 dma = pci_map_single(mac->dma_pdev, skb->data, skb->len,
 338                                      PCI_DMA_FROMDEVICE);
 339
 340                 if (dma_mapping_error(dma)) {
 341                         dev_kfree_skb_irq(info->skb);
 342                         count = i - start;
 343                         break;
 344                 }
 345
 346                 info->skb = skb;
 347                 info->dma = dma;
 348                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
 349         }
 350
 351         wmb();
 352
 353         pci_write_config_dword(mac->dma_pdev,
 354                                PAS_DMA_RXCHAN_INCR(mac->dma_rxch),
 355                                count);
 356         pci_write_config_dword(mac->dma_pdev,
 357                                PAS_DMA_RXINT_INCR(mac->dma_if),
 358                                count);
 359
 360         mac->rx->next_to_fill += count;
 361 }
 362
 363 static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 364 {
 365         unsigned int i;
 366         int start, count;
 367
 368         spin_lock(&mac->rx->lock);
 369
 370         start = mac->rx->next_to_clean;
 371         count = 0;
 372
 373         for (i = start; i < (start + RX_RING_SIZE) && count < limit; i++) {
 374                 struct pas_dma_xct_descr *dp;
 375                 struct pasemi_mac_buffer *info;
 376                 struct sk_buff *skb;
 377                 unsigned int j, len;
 378                 dma_addr_t dma;
 379
 380                 rmb();
 381
 382                 dp = &RX_DESC(mac, i);
 383
 384                 if (!(dp->macrx & XCT_MACRX_O))
 385                         break;
 386
 387                 count++;
 388
 389                 info = NULL;
 390
 391                 /* We have to scan for our skb since there's no way
 392                  * to back-map them from the descriptor, and if we
 393                  * have several receive channels then they might not
 394                  * show up in the same order as they were put on the
 395                  * interface ring.
 396                  */
 397
 398                 dma = (dp->ptr & XCT_PTR_ADDR_M);
 399                 for (j = start; j < (start + RX_RING_SIZE); j++) {
 400                         info = &RX_DESC_INFO(mac, j);
 401                         if (info->dma == dma)
 402                                 break;
 403                 }
 404
 405                 BUG_ON(!info);
 406                 BUG_ON(info->dma != dma);
 407
 408                 pci_unmap_single(mac->dma_pdev, info->dma, info->skb->len,
 409                                  PCI_DMA_FROMDEVICE);
 410
 411                 skb = info->skb;
 412
 413                 len = (dp->macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 414
 415                 skb_put(skb, len);
 416
 417                 skb->protocol = eth_type_trans(skb, mac->netdev);
 418
 419                 if ((dp->macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) {
 420                         skb->ip_summed = CHECKSUM_COMPLETE;
 421                         skb->csum = (dp->macrx & XCT_MACRX_CSUM_M) >>
 422                                            XCT_MACRX_CSUM_S;
 423                 } else
 424                         skb->ip_summed = CHECKSUM_NONE;
 425
 426                 mac->stats.rx_bytes += len;
 427                 mac->stats.rx_packets++;
 428
 429                 netif_receive_skb(skb);
 430
 431                 info->dma = 0;
 432                 info->skb = NULL;
 433                 dp->ptr = 0;
 434                 dp->macrx = 0;
 435         }
 436
 437         mac->rx->next_to_clean += count;
 438         pasemi_mac_replenish_rx_ring(mac->netdev);
 439
 440         spin_unlock(&mac->rx->lock);
 441
 442         return count;
 443 }
 444
 445 static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
 446 {
 447         int i;
 448         struct pasemi_mac_buffer *info;
 449         struct pas_dma_xct_descr *dp;
 450         int start, count;
 451         int flags;
 452
 453         spin_lock_irqsave(&mac->tx->lock, flags);
 454
 455         start = mac->tx->next_to_clean;
 456         count = 0;
 457
 458         for (i = start; i < mac->tx->next_to_use; i++) {
 459                 dp = &TX_DESC(mac, i);
 460                 if (!dp || (dp->mactx & XCT_MACTX_O))
 461                         break;
 462
 463                 count++;
 464
 465                 info = &TX_DESC_INFO(mac, i);
 466
 467                 pci_unmap_single(mac->dma_pdev, info->dma,
 468                                  info->skb->len, PCI_DMA_TODEVICE);
 469                 dev_kfree_skb_irq(info->skb);
 470
 471                 info->skb = NULL;
 472                 info->dma = 0;
 473                 dp->mactx = 0;
 474                 dp->ptr = 0;
 475         }
 476         mac->tx->next_to_clean += count;
 477         spin_unlock_irqrestore(&mac->tx->lock, flags);
 478
 479         return count;
 480 }
 481
 482
 483 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 484 {
 485         struct net_device *dev = data;
 486         struct pasemi_mac *mac = netdev_priv(dev);
 487         unsigned int reg;
 488
 489         if (!(*mac->rx_status & PAS_STATUS_INT))
 490                 return IRQ_NONE;
 491
 492         netif_rx_schedule(dev);
 493         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 494                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0));
 495
 496         reg = PAS_IOB_DMA_RXCH_RESET_PINTC | PAS_IOB_DMA_RXCH_RESET_SINTC |
 497               PAS_IOB_DMA_RXCH_RESET_DINTC;
 498         if (*mac->rx_status & PAS_STATUS_TIMER)
 499                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 500
 501         pci_write_config_dword(mac->iob_pdev,
 502                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 503
 504
 505         return IRQ_HANDLED;
 506 }
 507
 508 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 509 {
 510         struct net_device *dev = data;
 511         struct pasemi_mac *mac = netdev_priv(dev);
 512         unsigned int reg;
 513         int was_full;
 514
 515         was_full = mac->tx->next_to_clean - mac->tx->next_to_use == TX_RING_SIZE;
 516
 517         if (!(*mac->tx_status & PAS_STATUS_INT))
 518                 return IRQ_NONE;
 519
 520         pasemi_mac_clean_tx(mac);
 521
 522         reg = PAS_IOB_DMA_TXCH_RESET_PINTC | PAS_IOB_DMA_TXCH_RESET_SINTC;
 523         if (*mac->tx_status & PAS_STATUS_TIMER)
 524                 reg |= PAS_IOB_DMA_TXCH_RESET_TINTC;
 525
 526         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch),
 527                                reg);
 528
 529         if (was_full)
 530                 netif_wake_queue(dev);
 531
 532         return IRQ_HANDLED;
 533 }
 534
 535 static int pasemi_mac_open(struct net_device *dev)
 536 {
 537         struct pasemi_mac *mac = netdev_priv(dev);
 538         unsigned int flags;
 539         int ret;
 540
 541         /* enable rx section */
 542         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_RXCMD,
 543                                PAS_DMA_COM_RXCMD_EN);
 544
 545         /* enable tx section */
 546         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_TXCMD,
 547                                PAS_DMA_COM_TXCMD_EN);
 548
 549         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
 550                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
 551                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
 552
 553         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_TXP, flags);
 554
 555         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 556                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
 557
 558         flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 559
 560         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 561                                PAS_IOB_DMA_RXCH_CFG_CNTTH(30));
 562
 563         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 564                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000));
 565
 566         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 567
 568         ret = pasemi_mac_setup_rx_resources(dev);
 569         if (ret)
 570                 goto out_rx_resources;
 571
 572         ret = pasemi_mac_setup_tx_resources(dev);
 573         if (ret)
 574                 goto out_tx_resources;
 575
 576         pci_write_config_dword(mac->pdev, PAS_MAC_IPC_CHNL,
 577                                PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
 578                                PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
 579
 580         /* enable rx if */
 581         pci_write_config_dword(mac->dma_pdev,
 582                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 583                                PAS_DMA_RXINT_RCMDSTA_EN);
 584
 585         /* enable rx channel */
 586         pci_write_config_dword(mac->dma_pdev,
 587                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 588                                PAS_DMA_RXCHAN_CCMDSTA_EN |
 589                                PAS_DMA_RXCHAN_CCMDSTA_DU);
 590
 591         /* enable tx channel */
 592         pci_write_config_dword(mac->dma_pdev,
 593                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 594                                PAS_DMA_TXCHAN_TCMDSTA_EN);
 595
 596         pasemi_mac_replenish_rx_ring(dev);
 597
 598         netif_start_queue(dev);
 599         netif_poll_enable(dev);
 600
 601         ret = request_irq(mac->dma_pdev->irq + mac->dma_txch,
 602                           &pasemi_mac_tx_intr, IRQF_DISABLED,
 603                           mac->tx->irq_name, dev);
 604         if (ret) {
 605                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 606                        mac->dma_pdev->irq + mac->dma_txch, ret);
 607                 goto out_tx_int;
 608         }
 609
 610         ret = request_irq(mac->dma_pdev->irq + 20 + mac->dma_rxch,
 611                           &pasemi_mac_rx_intr, IRQF_DISABLED,
 612                           mac->rx->irq_name, dev);
 613         if (ret) {
 614                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 615                        mac->dma_pdev->irq + 20 + mac->dma_rxch, ret);
 616                 goto out_rx_int;
 617         }
 618
 619         return 0;
 620
 621 out_rx_int:
 622         free_irq(mac->dma_pdev->irq + mac->dma_txch, dev);
 623 out_tx_int:
 624         netif_poll_disable(dev);
 625         netif_stop_queue(dev);
 626         pasemi_mac_free_tx_resources(dev);
 627 out_tx_resources:
 628         pasemi_mac_free_rx_resources(dev);
 629 out_rx_resources:
 630
 631         return ret;
 632 }
 633
 634 #define MAX_RETRIES 5000
 635
 636 static int pasemi_mac_close(struct net_device *dev)
 637 {
 638         struct pasemi_mac *mac = netdev_priv(dev);
 639         unsigned int stat;
 640         int retries;
 641
 642         netif_stop_queue(dev);
 643
 644         /* Clean out any pending buffers */
 645         pasemi_mac_clean_tx(mac);
 646         pasemi_mac_clean_rx(mac, RX_RING_SIZE);
 647
 648         /* Disable interface */
 649         pci_write_config_dword(mac->dma_pdev,
 650                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 651                                PAS_DMA_TXCHAN_TCMDSTA_ST);
 652         pci_write_config_dword(mac->dma_pdev,
 653                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 654                       PAS_DMA_RXINT_RCMDSTA_ST);
 655         pci_write_config_dword(mac->dma_pdev,
 656                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 657                       PAS_DMA_RXCHAN_CCMDSTA_ST);
 658
 659         for (retries = 0; retries < MAX_RETRIES; retries++) {
 660                 pci_read_config_dword(mac->dma_pdev,
 661                                       PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 662                                       &stat);
 663                 if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
 664                         break;
 665                 cond_resched();
 666         }
 667
 668         if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)) {
 669                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
 670         }
 671
 672         for (retries = 0; retries < MAX_RETRIES; retries++) {
 673                 pci_read_config_dword(mac->dma_pdev,
 674                                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 675                                       &stat);
 676                 if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
 677                         break;
 678                 cond_resched();
 679         }
 680
 681         if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)) {
 682                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
 683         }
 684
 685         for (retries = 0; retries < MAX_RETRIES; retries++) {
 686                 pci_read_config_dword(mac->dma_pdev,
 687                                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 688                                       &stat);
 689                 if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
 690                         break;
 691                 cond_resched();
 692         }
 693
 694         if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT)) {
 695                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
 696         }
 697
 698         /* Then, disable the channel. This must be done separately from
 699          * stopping, since you can't disable when active.
 700          */
 701
 702         pci_write_config_dword(mac->dma_pdev,
 703                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
 704         pci_write_config_dword(mac->dma_pdev,
 705                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
 706         pci_write_config_dword(mac->dma_pdev,
 707                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
 708
 709         free_irq(mac->dma_pdev->irq + mac->dma_txch, dev);
 710         free_irq(mac->dma_pdev->irq + 20 + mac->dma_rxch, dev);
 711
 712         /* Free resources */
 713         pasemi_mac_free_rx_resources(dev);
 714         pasemi_mac_free_tx_resources(dev);
 715
 716         return 0;
 717 }
 718
 719 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
 720 {
 721         struct pasemi_mac *mac = netdev_priv(dev);
 722         struct pasemi_mac_txring *txring;
 723         struct pasemi_mac_buffer *info;
 724         struct pas_dma_xct_descr *dp;
 725         u64 dflags;
 726         dma_addr_t map;
 727         int flags;
 728
 729         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
 730
 731         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 732                 const unsigned char *nh = skb_network_header(skb);
 733
 734                 switch (ip_hdr(skb)->protocol) {
 735                 case IPPROTO_TCP:
 736                         dflags |= XCT_MACTX_CSUM_TCP;
 737                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 738                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 739                         break;
 740                 case IPPROTO_UDP:
 741                         dflags |= XCT_MACTX_CSUM_UDP;
 742                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 743                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 744                         break;
 745                 }
 746         }
 747
 748         map = pci_map_single(mac->dma_pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
 749
 750         if (dma_mapping_error(map))
 751                 return NETDEV_TX_BUSY;
 752
 753         txring = mac->tx;
 754
 755         spin_lock_irqsave(&txring->lock, flags);
 756
 757         if (txring->next_to_clean - txring->next_to_use == TX_RING_SIZE) {
 758                 spin_unlock_irqrestore(&txring->lock, flags);
 759                 pasemi_mac_clean_tx(mac);
 760                 spin_lock_irqsave(&txring->lock, flags);
 761
 762                 if (txring->next_to_clean - txring->next_to_use ==
 763                     TX_RING_SIZE) {
 764                         /* Still no room -- stop the queue and wait for tx
 765                          * intr when there's room.
 766                          */
 767                         netif_stop_queue(dev);
 768                         goto out_err;
 769                 }
 770         }
 771
 772
 773         dp = &TX_DESC(mac, txring->next_to_use);
 774         info = &TX_DESC_INFO(mac, txring->next_to_use);
 775
 776         dp->mactx = dflags | XCT_MACTX_LLEN(skb->len);
 777         dp->ptr   = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
 778         info->dma = map;
 779         info->skb = skb;
 780
 781         txring->next_to_use++;
 782         mac->stats.tx_packets++;
 783         mac->stats.tx_bytes += skb->len;
 784
 785         spin_unlock_irqrestore(&txring->lock, flags);
 786
 787         pci_write_config_dword(mac->dma_pdev,
 788                                PAS_DMA_TXCHAN_INCR(mac->dma_txch), 1);
 789
 790         return NETDEV_TX_OK;
 791
 792 out_err:
 793         spin_unlock_irqrestore(&txring->lock, flags);
 794         pci_unmap_single(mac->dma_pdev, map, skb->len, PCI_DMA_TODEVICE);
 795         return NETDEV_TX_BUSY;
 796 }
 797
 798 static struct net_device_stats *pasemi_mac_get_stats(struct net_device *dev)
 799 {
 800         struct pasemi_mac *mac = netdev_priv(dev);
 801
 802         return &mac->stats;
 803 }
 804
 805 static void pasemi_mac_set_rx_mode(struct net_device *dev)
 806 {
 807         struct pasemi_mac *mac = netdev_priv(dev);
 808         unsigned int flags;
 809
 810         pci_read_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, &flags);
 811
 812         /* Set promiscuous */
 813         if (dev->flags & IFF_PROMISC)
 814                 flags |= PAS_MAC_CFG_PCFG_PR;
 815         else
 816                 flags &= ~PAS_MAC_CFG_PCFG_PR;
 817
 818         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 819 }
 820
 821
 822 static int pasemi_mac_poll(struct net_device *dev, int *budget)
 823 {
 824         int pkts, limit = min(*budget, dev->quota);
 825         struct pasemi_mac *mac = netdev_priv(dev);
 826
 827         pkts = pasemi_mac_clean_rx(mac, limit);
 828
 829         if (pkts < limit) {
 830                 /* all done, no more packets present */
 831                 netif_rx_complete(dev);
 832
 833                 /* re-enable receive interrupts */
 834                 pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 835                                        PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000));
 836                 return 0;
 837         } else {
 838                 /* used up our quantum, so reschedule */
 839                 dev->quota -= pkts;
 840                 *budget -= pkts;
 841                 return 1;
 842         }
 843 }
 844
 845 static int __devinit
 846 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 847 {
 848         static int index = 0;
 849         struct net_device *dev;
 850         struct pasemi_mac *mac;
 851         int err;
 852
 853         err = pci_enable_device(pdev);
 854         if (err)
 855                 return err;
 856
 857         dev = alloc_etherdev(sizeof(struct pasemi_mac));
 858         if (dev == NULL) {
 859                 dev_err(&pdev->dev,
 860                         "pasemi_mac: Could not allocate ethernet device.\n");
 861                 err = -ENOMEM;
 862                 goto out_disable_device;
 863         }
 864
 865         SET_MODULE_OWNER(dev);
 866         pci_set_drvdata(pdev, dev);
 867         SET_NETDEV_DEV(dev, &pdev->dev);
 868
 869         mac = netdev_priv(dev);
 870
 871         mac->pdev = pdev;
 872         mac->netdev = dev;
 873         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
 874
 875         if (!mac->dma_pdev) {
 876                 dev_err(&pdev->dev, "Can't find DMA Controller\n");
 877                 err = -ENODEV;
 878                 goto out_free_netdev;
 879         }
 880
 881         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
 882
 883         if (!mac->iob_pdev) {
 884                 dev_err(&pdev->dev, "Can't find I/O Bridge\n");
 885                 err = -ENODEV;
 886                 goto out_put_dma_pdev;
 887         }
 888
 889         /* These should come out of the device tree eventually */
 890         mac->dma_txch = index;
 891         mac->dma_rxch = index;
 892
 893         /* We probe GMAC before XAUI, but the DMA interfaces are
 894          * in XAUI, GMAC order.
 895          */
 896         if (index < 4)
 897                 mac->dma_if = index + 2;
 898         else
 899                 mac->dma_if = index - 4;
 900         index++;
 901
 902         switch (pdev->device) {
 903         case 0xa005:
 904                 mac->type = MAC_TYPE_GMAC;
 905                 break;
 906         case 0xa006:
 907                 mac->type = MAC_TYPE_XAUI;
 908                 break;
 909         default:
 910                 err = -ENODEV;
 911                 goto out;
 912         }
 913
 914         /* get mac addr from device tree */
 915         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
 916                 err = -ENODEV;
 917                 goto out;
 918         }
 919         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
 920
 921         dev->open = pasemi_mac_open;
 922         dev->stop = pasemi_mac_close;
 923         dev->hard_start_xmit = pasemi_mac_start_tx;
 924         dev->get_stats = pasemi_mac_get_stats;
 925         dev->set_multicast_list = pasemi_mac_set_rx_mode;
 926         dev->weight = 64;
 927         dev->poll = pasemi_mac_poll;
 928         dev->features = NETIF_F_HW_CSUM;
 929
 930         /* The dma status structure is located in the I/O bridge, and
 931          * is cache coherent.
 932          */
 933         if (!dma_status)
 934                 /* XXXOJN This should come from the device tree */
 935                 dma_status = __ioremap(0xfd800000, 0x1000, 0);
 936
 937         mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
 938         mac->tx_status = &dma_status->tx_sta[mac->dma_txch];
 939
 940         err = register_netdev(dev);
 941
 942         if (err) {
 943                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
 944                         err);
 945                 goto out;
 946         } else
 947                 printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
 948                        "hw addr %02x:%02x:%02x:%02x:%02x:%02x\n",
 949                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
 950                        mac->dma_if, mac->dma_txch, mac->dma_rxch,
 951                        dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
 952                        dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
 953
 954         return err;
 955
 956 out:
 957         pci_dev_put(mac->iob_pdev);
 958 out_put_dma_pdev:
 959         pci_dev_put(mac->dma_pdev);
 960 out_free_netdev:
 961         free_netdev(dev);
 962 out_disable_device:
 963         pci_disable_device(pdev);
 964         return err;
 965
 966 }
 967
 968 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
 969 {
 970         struct net_device *netdev = pci_get_drvdata(pdev);
 971         struct pasemi_mac *mac;
 972
 973         if (!netdev)
 974                 return;
 975
 976         mac = netdev_priv(netdev);
 977
 978         unregister_netdev(netdev);
 979
 980         pci_disable_device(pdev);
 981         pci_dev_put(mac->dma_pdev);
 982         pci_dev_put(mac->iob_pdev);
 983
 984         pci_set_drvdata(pdev, NULL);
 985         free_netdev(netdev);
 986 }
 987
 988 static struct pci_device_id pasemi_mac_pci_tbl[] = {
 989         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
 990         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
 991 };
 992
 993 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
 994
 995 static struct pci_driver pasemi_mac_driver = {
 996         .name           = "pasemi_mac",
 997         .id_table       = pasemi_mac_pci_tbl,
 998         .probe          = pasemi_mac_probe,
 999         .remove         = __devexit_p(pasemi_mac_remove),
1000 };
1001
1002 static void __exit pasemi_mac_cleanup_module(void)
1003 {
1004         pci_unregister_driver(&pasemi_mac_driver);
1005         __iounmap(dma_status);
1006         dma_status = NULL;
1007 }
1008
1009 int pasemi_mac_init_module(void)
1010 {
1011         return pci_register_driver(&pasemi_mac_driver);
1012 }
1013
1014 MODULE_LICENSE("GPL");
1015 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
1016 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
1017
1018 module_init(pasemi_mac_init_module);
1019 module_exit(pasemi_mac_cleanup_module);