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                 skb->dev = dev;
 338
 339                 dma = pci_map_single(mac->dma_pdev, skb->data, skb->len,
 340                                      PCI_DMA_FROMDEVICE);
 341
 342                 if (dma_mapping_error(dma)) {
 343                         dev_kfree_skb_irq(info->skb);
 344                         count = i - start;
 345                         break;
 346                 }
 347
 348                 info->skb = skb;
 349                 info->dma = dma;
 350                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
 351         }
 352
 353         wmb();
 354
 355         pci_write_config_dword(mac->dma_pdev,
 356                                PAS_DMA_RXCHAN_INCR(mac->dma_rxch),
 357                                count);
 358         pci_write_config_dword(mac->dma_pdev,
 359                                PAS_DMA_RXINT_INCR(mac->dma_if),
 360                                count);
 361
 362         mac->rx->next_to_fill += count;
 363 }
 364
 365 static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 366 {
 367         unsigned int i;
 368         int start, count;
 369
 370         spin_lock(&mac->rx->lock);
 371
 372         start = mac->rx->next_to_clean;
 373         count = 0;
 374
 375         for (i = start; i < (start + RX_RING_SIZE) && count < limit; i++) {
 376                 struct pas_dma_xct_descr *dp;
 377                 struct pasemi_mac_buffer *info;
 378                 struct sk_buff *skb;
 379                 unsigned int j, len;
 380                 dma_addr_t dma;
 381
 382                 rmb();
 383
 384                 dp = &RX_DESC(mac, i);
 385
 386                 if (!(dp->macrx & XCT_MACRX_O))
 387                         break;
 388
 389                 count++;
 390
 391                 info = NULL;
 392
 393                 /* We have to scan for our skb since there's no way
 394                  * to back-map them from the descriptor, and if we
 395                  * have several receive channels then they might not
 396                  * show up in the same order as they were put on the
 397                  * interface ring.
 398                  */
 399
 400                 dma = (dp->ptr & XCT_PTR_ADDR_M);
 401                 for (j = start; j < (start + RX_RING_SIZE); j++) {
 402                         info = &RX_DESC_INFO(mac, j);
 403                         if (info->dma == dma)
 404                                 break;
 405                 }
 406
 407                 BUG_ON(!info);
 408                 BUG_ON(info->dma != dma);
 409
 410                 pci_unmap_single(mac->dma_pdev, info->dma, info->skb->len,
 411                                  PCI_DMA_FROMDEVICE);
 412
 413                 skb = info->skb;
 414
 415                 len = (dp->macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 416
 417                 skb_put(skb, len);
 418
 419                 skb->protocol = eth_type_trans(skb, mac->netdev);
 420
 421                 if ((dp->macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) {
 422                         skb->ip_summed = CHECKSUM_COMPLETE;
 423                         skb->csum = (dp->macrx & XCT_MACRX_CSUM_M) >>
 424                                            XCT_MACRX_CSUM_S;
 425                 } else
 426                         skb->ip_summed = CHECKSUM_NONE;
 427
 428                 mac->stats.rx_bytes += len;
 429                 mac->stats.rx_packets++;
 430
 431                 netif_receive_skb(skb);
 432
 433                 info->dma = 0;
 434                 info->skb = NULL;
 435                 dp->ptr = 0;
 436                 dp->macrx = 0;
 437         }
 438
 439         mac->rx->next_to_clean += count;
 440         pasemi_mac_replenish_rx_ring(mac->netdev);
 441
 442         spin_unlock(&mac->rx->lock);
 443
 444         return count;
 445 }
 446
 447 static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
 448 {
 449         int i;
 450         struct pasemi_mac_buffer *info;
 451         struct pas_dma_xct_descr *dp;
 452         int start, count;
 453         int flags;
 454
 455         spin_lock_irqsave(&mac->tx->lock, flags);
 456
 457         start = mac->tx->next_to_clean;
 458         count = 0;
 459
 460         for (i = start; i < mac->tx->next_to_use; i++) {
 461                 dp = &TX_DESC(mac, i);
 462                 if (!dp || (dp->mactx & XCT_MACTX_O))
 463                         break;
 464
 465                 count++;
 466
 467                 info = &TX_DESC_INFO(mac, i);
 468
 469                 pci_unmap_single(mac->dma_pdev, info->dma,
 470                                  info->skb->len, PCI_DMA_TODEVICE);
 471                 dev_kfree_skb_irq(info->skb);
 472
 473                 info->skb = NULL;
 474                 info->dma = 0;
 475                 dp->mactx = 0;
 476                 dp->ptr = 0;
 477         }
 478         mac->tx->next_to_clean += count;
 479         spin_unlock_irqrestore(&mac->tx->lock, flags);
 480
 481         return count;
 482 }
 483
 484
 485 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 486 {
 487         struct net_device *dev = data;
 488         struct pasemi_mac *mac = netdev_priv(dev);
 489         unsigned int reg;
 490
 491         if (!(*mac->rx_status & PAS_STATUS_INT))
 492                 return IRQ_NONE;
 493
 494         netif_rx_schedule(dev);
 495         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 496                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0));
 497
 498         reg = PAS_IOB_DMA_RXCH_RESET_PINTC | PAS_IOB_DMA_RXCH_RESET_SINTC |
 499               PAS_IOB_DMA_RXCH_RESET_DINTC;
 500         if (*mac->rx_status & PAS_STATUS_TIMER)
 501                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 502
 503         pci_write_config_dword(mac->iob_pdev,
 504                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 505
 506
 507         return IRQ_HANDLED;
 508 }
 509
 510 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 511 {
 512         struct net_device *dev = data;
 513         struct pasemi_mac *mac = netdev_priv(dev);
 514         unsigned int reg;
 515         int was_full;
 516
 517         was_full = mac->tx->next_to_clean - mac->tx->next_to_use == TX_RING_SIZE;
 518
 519         if (!(*mac->tx_status & PAS_STATUS_INT))
 520                 return IRQ_NONE;
 521
 522         pasemi_mac_clean_tx(mac);
 523
 524         reg = PAS_IOB_DMA_TXCH_RESET_PINTC | PAS_IOB_DMA_TXCH_RESET_SINTC;
 525         if (*mac->tx_status & PAS_STATUS_TIMER)
 526                 reg |= PAS_IOB_DMA_TXCH_RESET_TINTC;
 527
 528         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch),
 529                                reg);
 530
 531         if (was_full)
 532                 netif_wake_queue(dev);
 533
 534         return IRQ_HANDLED;
 535 }
 536
 537 static int pasemi_mac_open(struct net_device *dev)
 538 {
 539         struct pasemi_mac *mac = netdev_priv(dev);
 540         unsigned int flags;
 541         int ret;
 542
 543         /* enable rx section */
 544         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_RXCMD,
 545                                PAS_DMA_COM_RXCMD_EN);
 546
 547         /* enable tx section */
 548         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_TXCMD,
 549                                PAS_DMA_COM_TXCMD_EN);
 550
 551         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
 552                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
 553                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
 554
 555         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_TXP, flags);
 556
 557         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 558                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
 559
 560         flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 561
 562         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 563                                PAS_IOB_DMA_RXCH_CFG_CNTTH(30));
 564
 565         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 566                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000));
 567
 568         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 569
 570         ret = pasemi_mac_setup_rx_resources(dev);
 571         if (ret)
 572                 goto out_rx_resources;
 573
 574         ret = pasemi_mac_setup_tx_resources(dev);
 575         if (ret)
 576                 goto out_tx_resources;
 577
 578         pci_write_config_dword(mac->pdev, PAS_MAC_IPC_CHNL,
 579                                PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
 580                                PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
 581
 582         /* enable rx if */
 583         pci_write_config_dword(mac->dma_pdev,
 584                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 585                                PAS_DMA_RXINT_RCMDSTA_EN);
 586
 587         /* enable rx channel */
 588         pci_write_config_dword(mac->dma_pdev,
 589                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 590                                PAS_DMA_RXCHAN_CCMDSTA_EN |
 591                                PAS_DMA_RXCHAN_CCMDSTA_DU);
 592
 593         /* enable tx channel */
 594         pci_write_config_dword(mac->dma_pdev,
 595                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 596                                PAS_DMA_TXCHAN_TCMDSTA_EN);
 597
 598         pasemi_mac_replenish_rx_ring(dev);
 599
 600         netif_start_queue(dev);
 601         netif_poll_enable(dev);
 602
 603         ret = request_irq(mac->dma_pdev->irq + mac->dma_txch,
 604                           &pasemi_mac_tx_intr, IRQF_DISABLED,
 605                           mac->tx->irq_name, dev);
 606         if (ret) {
 607                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 608                        mac->dma_pdev->irq + mac->dma_txch, ret);
 609                 goto out_tx_int;
 610         }
 611
 612         ret = request_irq(mac->dma_pdev->irq + 20 + mac->dma_rxch,
 613                           &pasemi_mac_rx_intr, IRQF_DISABLED,
 614                           mac->rx->irq_name, dev);
 615         if (ret) {
 616                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 617                        mac->dma_pdev->irq + 20 + mac->dma_rxch, ret);
 618                 goto out_rx_int;
 619         }
 620
 621         return 0;
 622
 623 out_rx_int:
 624         free_irq(mac->dma_pdev->irq + mac->dma_txch, dev);
 625 out_tx_int:
 626         netif_poll_disable(dev);
 627         netif_stop_queue(dev);
 628         pasemi_mac_free_tx_resources(dev);
 629 out_tx_resources:
 630         pasemi_mac_free_rx_resources(dev);
 631 out_rx_resources:
 632
 633         return ret;
 634 }
 635
 636 #define MAX_RETRIES 5000
 637
 638 static int pasemi_mac_close(struct net_device *dev)
 639 {
 640         struct pasemi_mac *mac = netdev_priv(dev);
 641         unsigned int stat;
 642         int retries;
 643
 644         netif_stop_queue(dev);
 645
 646         /* Clean out any pending buffers */
 647         pasemi_mac_clean_tx(mac);
 648         pasemi_mac_clean_rx(mac, RX_RING_SIZE);
 649
 650         /* Disable interface */
 651         pci_write_config_dword(mac->dma_pdev,
 652                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 653                                PAS_DMA_TXCHAN_TCMDSTA_ST);
 654         pci_write_config_dword(mac->dma_pdev,
 655                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 656                       PAS_DMA_RXINT_RCMDSTA_ST);
 657         pci_write_config_dword(mac->dma_pdev,
 658                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 659                       PAS_DMA_RXCHAN_CCMDSTA_ST);
 660
 661         for (retries = 0; retries < MAX_RETRIES; retries++) {
 662                 pci_read_config_dword(mac->dma_pdev,
 663                                       PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 664                                       &stat);
 665                 if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
 666                         break;
 667                 cond_resched();
 668         }
 669
 670         if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)) {
 671                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
 672         }
 673
 674         for (retries = 0; retries < MAX_RETRIES; retries++) {
 675                 pci_read_config_dword(mac->dma_pdev,
 676                                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 677                                       &stat);
 678                 if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
 679                         break;
 680                 cond_resched();
 681         }
 682
 683         if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)) {
 684                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
 685         }
 686
 687         for (retries = 0; retries < MAX_RETRIES; retries++) {
 688                 pci_read_config_dword(mac->dma_pdev,
 689                                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 690                                       &stat);
 691                 if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
 692                         break;
 693                 cond_resched();
 694         }
 695
 696         if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT)) {
 697                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
 698         }
 699
 700         /* Then, disable the channel. This must be done separately from
 701          * stopping, since you can't disable when active.
 702          */
 703
 704         pci_write_config_dword(mac->dma_pdev,
 705                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
 706         pci_write_config_dword(mac->dma_pdev,
 707                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
 708         pci_write_config_dword(mac->dma_pdev,
 709                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
 710
 711         free_irq(mac->dma_pdev->irq + mac->dma_txch, dev);
 712         free_irq(mac->dma_pdev->irq + 20 + mac->dma_rxch, dev);
 713
 714         /* Free resources */
 715         pasemi_mac_free_rx_resources(dev);
 716         pasemi_mac_free_tx_resources(dev);
 717
 718         return 0;
 719 }
 720
 721 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
 722 {
 723         struct pasemi_mac *mac = netdev_priv(dev);
 724         struct pasemi_mac_txring *txring;
 725         struct pasemi_mac_buffer *info;
 726         struct pas_dma_xct_descr *dp;
 727         u64 dflags;
 728         dma_addr_t map;
 729         int flags;
 730
 731         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
 732
 733         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 734                 switch (skb->nh.iph->protocol) {
 735                 case IPPROTO_TCP:
 736                         dflags |= XCT_MACTX_CSUM_TCP;
 737                         dflags |= XCT_MACTX_IPH((skb->h.raw - skb->nh.raw) >> 2);
 738                         dflags |= XCT_MACTX_IPO(skb->nh.raw - skb->data);
 739                         break;
 740                 case IPPROTO_UDP:
 741                         dflags |= XCT_MACTX_CSUM_UDP;
 742                         dflags |= XCT_MACTX_IPH((skb->h.raw - skb->nh.raw) >> 2);
 743                         dflags |= XCT_MACTX_IPO(skb->nh.raw - 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);