SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/net/pasemi_mac.c

   1 /*
   2  * Copyright (C) 2006-2007 PA Semi, Inc
   3  *
   4  * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/dmaengine.h>
  25 #include <linux/delay.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <asm/dma-mapping.h>
  29 #include <linux/in.h>
  30 #include <linux/skbuff.h>
  31
  32 #include <linux/ip.h>
  33 #include <linux/tcp.h>
  34 #include <net/checksum.h>
  35
  36 #include <asm/irq.h>
  37
  38 #include "pasemi_mac.h"
  39
  40
  41 /* TODO list
  42  *
  43  * - Get rid of pci_{read,write}_config(), map registers with ioremap
  44  *   for performance
  45  * - PHY support
  46  * - Multicast support
  47  * - Large MTU support
  48  * - Other performance improvements
  49  */
  50
  51
  52 /* Must be a power of two */
  53 #define RX_RING_SIZE 512
  54 #define TX_RING_SIZE 512
  55
  56 #define TX_DESC(mac, num)       ((mac)->tx->desc[(num) & (TX_RING_SIZE-1)])
  57 #define TX_DESC_INFO(mac, num)  ((mac)->tx->desc_info[(num) & (TX_RING_SIZE-1)])
  58 #define RX_DESC(mac, num)       ((mac)->rx->desc[(num) & (RX_RING_SIZE-1)])
  59 #define RX_DESC_INFO(mac, num)  ((mac)->rx->desc_info[(num) & (RX_RING_SIZE-1)])
  60 #define RX_BUFF(mac, num)       ((mac)->rx->buffers[(num) & (RX_RING_SIZE-1)])
  61
  62 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
  63
  64 /* XXXOJN these should come out of the device tree some day */
  65 #define PAS_DMA_CAP_BASE   0xe00d0040
  66 #define PAS_DMA_CAP_SIZE   0x100
  67 #define PAS_DMA_COM_BASE   0xe00d0100
  68 #define PAS_DMA_COM_SIZE   0x100
  69
  70 static struct pasdma_status *dma_status;
  71
  72 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
  73 {
  74         struct pci_dev *pdev = mac->pdev;
  75         struct device_node *dn = pci_device_to_OF_node(pdev);
  76         const u8 *maddr;
  77         u8 addr[6];
  78
  79         if (!dn) {
  80                 dev_dbg(&pdev->dev,
  81                           "No device node for mac, not configuring\n");
  82                 return -ENOENT;
  83         }
  84
  85         maddr = get_property(dn, "mac-address", NULL);
  86         if (maddr == NULL) {
  87                 dev_warn(&pdev->dev,
  88                          "no mac address in device tree, not configuring\n");
  89                 return -ENOENT;
  90         }
  91
  92         if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
  93                    &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
  94                 dev_warn(&pdev->dev,
  95                          "can't parse mac address, not configuring\n");
  96                 return -EINVAL;
  97         }
  98
  99         memcpy(mac->mac_addr, addr, sizeof(addr));
 100         return 0;
 101 }
 102
 103 static int pasemi_mac_setup_rx_resources(struct net_device *dev)
 104 {
 105         struct pasemi_mac_rxring *ring;
 106         struct pasemi_mac *mac = netdev_priv(dev);
 107         int chan_id = mac->dma_rxch;
 108
 109         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 110
 111         if (!ring)
 112                 goto out_ring;
 113
 114         spin_lock_init(&ring->lock);
 115
 116         ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 117                                   RX_RING_SIZE, GFP_KERNEL);
 118
 119         if (!ring->desc_info)
 120                 goto out_desc_info;
 121
 122         /* Allocate descriptors */
 123         ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
 124                                         RX_RING_SIZE *
 125                                         sizeof(struct pas_dma_xct_descr),
 126                                         &ring->dma, GFP_KERNEL);
 127
 128         if (!ring->desc)
 129                 goto out_desc;
 130
 131         memset(ring->desc, 0, RX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
 132
 133         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
 134                                            RX_RING_SIZE * sizeof(u64),
 135                                            &ring->buf_dma, GFP_KERNEL);
 136         if (!ring->buffers)
 137                 goto out_buffers;
 138
 139         memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
 140
 141         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEL(chan_id),
 142                                PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));
 143
 144         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_BASEU(chan_id),
 145                                PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
 146                                PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 2));
 147
 148         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXCHAN_CFG(chan_id),
 149                                PAS_DMA_RXCHAN_CFG_HBU(1));
 150
 151         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEL(mac->dma_if),
 152                                PAS_DMA_RXINT_BASEL_BRBL(__pa(ring->buffers)));
 153
 154         pci_write_config_dword(mac->dma_pdev, PAS_DMA_RXINT_BASEU(mac->dma_if),
 155                                PAS_DMA_RXINT_BASEU_BRBH(__pa(ring->buffers) >> 32) |
 156                                PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
 157
 158         ring->next_to_fill = 0;
 159         ring->next_to_clean = 0;
 160
 161         snprintf(ring->irq_name, sizeof(ring->irq_name),
 162                  "%s rx", dev->name);
 163         mac->rx = ring;
 164
 165         return 0;
 166
 167 out_buffers:
 168         dma_free_coherent(&mac->dma_pdev->dev,
 169                           RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 170                           mac->rx->desc, mac->rx->dma);
 171 out_desc:
 172         kfree(ring->desc_info);
 173 out_desc_info:
 174         kfree(ring);
 175 out_ring:
 176         return -ENOMEM;
 177 }
 178
 179
 180 static int pasemi_mac_setup_tx_resources(struct net_device *dev)
 181 {
 182         struct pasemi_mac *mac = netdev_priv(dev);
 183         u32 val;
 184         int chan_id = mac->dma_txch;
 185         struct pasemi_mac_txring *ring;
 186
 187         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 188         if (!ring)
 189                 goto out_ring;
 190
 191         spin_lock_init(&ring->lock);
 192
 193         ring->desc_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 194                                   TX_RING_SIZE, GFP_KERNEL);
 195         if (!ring->desc_info)
 196                 goto out_desc_info;
 197
 198         /* Allocate descriptors */
 199         ring->desc = dma_alloc_coherent(&mac->dma_pdev->dev,
 200                                         TX_RING_SIZE *
 201                                         sizeof(struct pas_dma_xct_descr),
 202                                         &ring->dma, GFP_KERNEL);
 203         if (!ring->desc)
 204                 goto out_desc;
 205
 206         memset(ring->desc, 0, TX_RING_SIZE * sizeof(struct pas_dma_xct_descr));
 207
 208         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEL(chan_id),
 209                                PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
 210         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
 211         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 2);
 212
 213         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_BASEU(chan_id), val);
 214
 215         pci_write_config_dword(mac->dma_pdev, PAS_DMA_TXCHAN_CFG(chan_id),
 216                                PAS_DMA_TXCHAN_CFG_TY_IFACE |
 217                                PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
 218                                PAS_DMA_TXCHAN_CFG_UP |
 219                                PAS_DMA_TXCHAN_CFG_WT(2));
 220
 221         ring->next_to_use = 0;
 222         ring->next_to_clean = 0;
 223
 224         snprintf(ring->irq_name, sizeof(ring->irq_name),
 225                  "%s tx", dev->name);
 226         mac->tx = ring;
 227
 228         return 0;
 229
 230 out_desc:
 231         kfree(ring->desc_info);
 232 out_desc_info:
 233         kfree(ring);
 234 out_ring:
 235         return -ENOMEM;
 236 }
 237
 238 static void pasemi_mac_free_tx_resources(struct net_device *dev)
 239 {
 240         struct pasemi_mac *mac = netdev_priv(dev);
 241         unsigned int i;
 242         struct pasemi_mac_buffer *info;
 243         struct pas_dma_xct_descr *dp;
 244
 245         for (i = 0; i < TX_RING_SIZE; i++) {
 246                 info = &TX_DESC_INFO(mac, i);
 247                 dp = &TX_DESC(mac, i);
 248                 if (info->dma) {
 249                         if (info->skb) {
 250                                 pci_unmap_single(mac->dma_pdev,
 251                                                  info->dma,
 252                                                  info->skb->len,
 253                                                  PCI_DMA_TODEVICE);
 254                                 dev_kfree_skb_any(info->skb);
 255                         }
 256                         info->dma = 0;
 257                         info->skb = NULL;
 258                         dp->mactx = 0;
 259                         dp->ptr = 0;
 260                 }
 261         }
 262
 263         dma_free_coherent(&mac->dma_pdev->dev,
 264                           TX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 265                           mac->tx->desc, mac->tx->dma);
 266
 267         kfree(mac->tx->desc_info);
 268         kfree(mac->tx);
 269         mac->tx = NULL;
 270 }
 271
 272 static void pasemi_mac_free_rx_resources(struct net_device *dev)
 273 {
 274         struct pasemi_mac *mac = netdev_priv(dev);
 275         unsigned int i;
 276         struct pasemi_mac_buffer *info;
 277         struct pas_dma_xct_descr *dp;
 278
 279         for (i = 0; i < RX_RING_SIZE; i++) {
 280                 info = &RX_DESC_INFO(mac, i);
 281                 dp = &RX_DESC(mac, i);
 282                 if (info->dma) {
 283                         if (info->skb) {
 284                                 pci_unmap_single(mac->dma_pdev,
 285                                                  info->dma,
 286                                                  info->skb->len,
 287                                                  PCI_DMA_FROMDEVICE);
 288                                 dev_kfree_skb_any(info->skb);
 289                         }
 290                         info->dma = 0;
 291                         info->skb = NULL;
 292                         dp->macrx = 0;
 293                         dp->ptr = 0;
 294                 }
 295         }
 296
 297         dma_free_coherent(&mac->dma_pdev->dev,
 298                           RX_RING_SIZE * sizeof(struct pas_dma_xct_descr),
 299                           mac->rx->desc, mac->rx->dma);
 300
 301         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
 302                           mac->rx->buffers, mac->rx->buf_dma);
 303
 304         kfree(mac->rx->desc_info);
 305         kfree(mac->rx);
 306         mac->rx = NULL;
 307 }
 308
 309 static void pasemi_mac_replenish_rx_ring(struct net_device *dev)
 310 {
 311         struct pasemi_mac *mac = netdev_priv(dev);
 312         unsigned int i;
 313         int start = mac->rx->next_to_fill;
 314         unsigned int count;
 315
 316         count = (mac->rx->next_to_clean + RX_RING_SIZE -
 317                  mac->rx->next_to_fill) & (RX_RING_SIZE - 1);
 318
 319         /* Check to see if we're doing first-time setup */
 320         if (unlikely(mac->rx->next_to_clean == 0 && mac->rx->next_to_fill == 0))
 321                 count = RX_RING_SIZE;
 322
 323         if (count <= 0)
 324                 return;
 325
 326         for (i = start; i < start + count; i++) {
 327                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(mac, i);
 328                 u64 *buff = &RX_BUFF(mac, i);
 329                 struct sk_buff *skb;
 330                 dma_addr_t dma;
 331
 332                 skb = dev_alloc_skb(BUF_SIZE);
 333
 334                 if (!skb) {
 335                         count = i - start;
 336                         break;
 337                 }
 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         netif_wake_queue(mac->netdev);
 482
 483         return count;
 484 }
 485
 486
 487 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 488 {
 489         struct net_device *dev = data;
 490         struct pasemi_mac *mac = netdev_priv(dev);
 491         unsigned int reg;
 492
 493         if (!(*mac->rx_status & PAS_STATUS_INT))
 494                 return IRQ_NONE;
 495
 496         netif_rx_schedule(dev);
 497         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 498                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0));
 499
 500         reg = PAS_IOB_DMA_RXCH_RESET_PINTC | PAS_IOB_DMA_RXCH_RESET_SINTC |
 501               PAS_IOB_DMA_RXCH_RESET_DINTC;
 502         if (*mac->rx_status & PAS_STATUS_TIMER)
 503                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 504
 505         pci_write_config_dword(mac->iob_pdev,
 506                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 507
 508
 509         return IRQ_HANDLED;
 510 }
 511
 512 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 513 {
 514         struct net_device *dev = data;
 515         struct pasemi_mac *mac = netdev_priv(dev);
 516         unsigned int reg;
 517
 518         if (!(*mac->tx_status & PAS_STATUS_INT))
 519                 return IRQ_NONE;
 520
 521         pasemi_mac_clean_tx(mac);
 522
 523         reg = PAS_IOB_DMA_TXCH_RESET_PINTC | PAS_IOB_DMA_TXCH_RESET_SINTC;
 524         if (*mac->tx_status & PAS_STATUS_TIMER)
 525                 reg |= PAS_IOB_DMA_TXCH_RESET_TINTC;
 526
 527         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch),
 528                                reg);
 529
 530         return IRQ_HANDLED;
 531 }
 532
 533 static int pasemi_mac_open(struct net_device *dev)
 534 {
 535         struct pasemi_mac *mac = netdev_priv(dev);
 536         int base_irq;
 537         unsigned int flags;
 538         int ret;
 539
 540         /* enable rx section */
 541         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_RXCMD,
 542                                PAS_DMA_COM_RXCMD_EN);
 543
 544         /* enable tx section */
 545         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_TXCMD,
 546                                PAS_DMA_COM_TXCMD_EN);
 547
 548         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
 549                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
 550                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
 551
 552         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_TXP, flags);
 553
 554         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 555                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
 556
 557         flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 558
 559         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 560                                PAS_IOB_DMA_RXCH_CFG_CNTTH(30));
 561
 562         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 563                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000));
 564
 565         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 566
 567         ret = pasemi_mac_setup_rx_resources(dev);
 568         if (ret)
 569                 goto out_rx_resources;
 570
 571         ret = pasemi_mac_setup_tx_resources(dev);
 572         if (ret)
 573                 goto out_tx_resources;
 574
 575         pci_write_config_dword(mac->pdev, PAS_MAC_IPC_CHNL,
 576                                PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
 577                                PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
 578
 579         /* enable rx if */
 580         pci_write_config_dword(mac->dma_pdev,
 581                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 582                                PAS_DMA_RXINT_RCMDSTA_EN);
 583
 584         /* enable rx channel */
 585         pci_write_config_dword(mac->dma_pdev,
 586                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 587                                PAS_DMA_RXCHAN_CCMDSTA_EN |
 588                                PAS_DMA_RXCHAN_CCMDSTA_DU);
 589
 590         /* enable tx channel */
 591         pci_write_config_dword(mac->dma_pdev,
 592                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 593                                PAS_DMA_TXCHAN_TCMDSTA_EN);
 594
 595         pasemi_mac_replenish_rx_ring(dev);
 596
 597         netif_start_queue(dev);
 598         netif_poll_enable(dev);
 599
 600         /* Interrupts are a bit different for our DMA controller: While
 601          * it's got one a regular PCI device header, the interrupt there
 602          * is really the base of the range it's using. Each tx and rx
 603          * channel has it's own interrupt source.
 604          */
 605
 606         base_irq = virq_to_hw(mac->dma_pdev->irq);
 607
 608         mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
 609         mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_txch);
 610
 611         ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
 612                           mac->tx->irq_name, dev);
 613         if (ret) {
 614                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 615                         base_irq + mac->dma_txch, ret);
 616                 goto out_tx_int;
 617         }
 618
 619         ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
 620                           mac->rx->irq_name, dev);
 621         if (ret) {
 622                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 623                         base_irq + 20 + mac->dma_rxch, ret);
 624                 goto out_rx_int;
 625         }
 626
 627         return 0;
 628
 629 out_rx_int:
 630         free_irq(mac->tx_irq, dev);
 631 out_tx_int:
 632         netif_poll_disable(dev);
 633         netif_stop_queue(dev);
 634         pasemi_mac_free_tx_resources(dev);
 635 out_tx_resources:
 636         pasemi_mac_free_rx_resources(dev);
 637 out_rx_resources:
 638
 639         return ret;
 640 }
 641
 642 #define MAX_RETRIES 5000
 643
 644 static int pasemi_mac_close(struct net_device *dev)
 645 {
 646         struct pasemi_mac *mac = netdev_priv(dev);
 647         unsigned int stat;
 648         int retries;
 649
 650         netif_stop_queue(dev);
 651
 652         /* Clean out any pending buffers */
 653         pasemi_mac_clean_tx(mac);
 654         pasemi_mac_clean_rx(mac, RX_RING_SIZE);
 655
 656         /* Disable interface */
 657         pci_write_config_dword(mac->dma_pdev,
 658                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 659                                PAS_DMA_TXCHAN_TCMDSTA_ST);
 660         pci_write_config_dword(mac->dma_pdev,
 661                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 662                       PAS_DMA_RXINT_RCMDSTA_ST);
 663         pci_write_config_dword(mac->dma_pdev,
 664                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 665                       PAS_DMA_RXCHAN_CCMDSTA_ST);
 666
 667         for (retries = 0; retries < MAX_RETRIES; retries++) {
 668                 pci_read_config_dword(mac->dma_pdev,
 669                                       PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 670                                       &stat);
 671                 if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT))
 672                         break;
 673                 cond_resched();
 674         }
 675
 676         if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
 677                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
 678
 679         for (retries = 0; retries < MAX_RETRIES; retries++) {
 680                 pci_read_config_dword(mac->dma_pdev,
 681                                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 682                                       &stat);
 683                 if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT))
 684                         break;
 685                 cond_resched();
 686         }
 687
 688         if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
 689                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
 690
 691         for (retries = 0; retries < MAX_RETRIES; retries++) {
 692                 pci_read_config_dword(mac->dma_pdev,
 693                                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 694                                       &stat);
 695                 if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT))
 696                         break;
 697                 cond_resched();
 698         }
 699
 700         if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
 701                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
 702
 703         /* Then, disable the channel. This must be done separately from
 704          * stopping, since you can't disable when active.
 705          */
 706
 707         pci_write_config_dword(mac->dma_pdev,
 708                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
 709         pci_write_config_dword(mac->dma_pdev,
 710                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
 711         pci_write_config_dword(mac->dma_pdev,
 712                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
 713
 714         free_irq(mac->tx_irq, dev);
 715         free_irq(mac->rx_irq, dev);
 716
 717         /* Free resources */
 718         pasemi_mac_free_rx_resources(dev);
 719         pasemi_mac_free_tx_resources(dev);
 720
 721         return 0;
 722 }
 723
 724 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
 725 {
 726         struct pasemi_mac *mac = netdev_priv(dev);
 727         struct pasemi_mac_txring *txring;
 728         struct pasemi_mac_buffer *info;
 729         struct pas_dma_xct_descr *dp;
 730         u64 dflags;
 731         dma_addr_t map;
 732         int flags;
 733
 734         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
 735
 736         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 737                 const unsigned char *nh = skb_network_header(skb);
 738
 739                 switch (ip_hdr(skb)->protocol) {
 740                 case IPPROTO_TCP:
 741                         dflags |= XCT_MACTX_CSUM_TCP;
 742                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 743                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 744                         break;
 745                 case IPPROTO_UDP:
 746                         dflags |= XCT_MACTX_CSUM_UDP;
 747                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 748                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 749                         break;
 750                 }
 751         }
 752
 753         map = pci_map_single(mac->dma_pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
 754
 755         if (dma_mapping_error(map))
 756                 return NETDEV_TX_BUSY;
 757
 758         txring = mac->tx;
 759
 760         spin_lock_irqsave(&txring->lock, flags);
 761
 762         if (txring->next_to_clean - txring->next_to_use == TX_RING_SIZE) {
 763                 spin_unlock_irqrestore(&txring->lock, flags);
 764                 pasemi_mac_clean_tx(mac);
 765                 spin_lock_irqsave(&txring->lock, flags);
 766
 767                 if (txring->next_to_clean - txring->next_to_use ==
 768                     TX_RING_SIZE) {
 769                         /* Still no room -- stop the queue and wait for tx
 770                          * intr when there's room.
 771                          */
 772                         netif_stop_queue(dev);
 773                         goto out_err;
 774                 }
 775         }
 776
 777
 778         dp = &TX_DESC(mac, txring->next_to_use);
 779         info = &TX_DESC_INFO(mac, txring->next_to_use);
 780
 781         dp->mactx = dflags | XCT_MACTX_LLEN(skb->len);
 782         dp->ptr   = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
 783         info->dma = map;
 784         info->skb = skb;
 785
 786         txring->next_to_use++;
 787         mac->stats.tx_packets++;
 788         mac->stats.tx_bytes += skb->len;
 789
 790         spin_unlock_irqrestore(&txring->lock, flags);
 791
 792         pci_write_config_dword(mac->dma_pdev,
 793                                PAS_DMA_TXCHAN_INCR(mac->dma_txch), 1);
 794
 795         return NETDEV_TX_OK;
 796
 797 out_err:
 798         spin_unlock_irqrestore(&txring->lock, flags);
 799         pci_unmap_single(mac->dma_pdev, map, skb->len, PCI_DMA_TODEVICE);
 800         return NETDEV_TX_BUSY;
 801 }
 802
 803 static struct net_device_stats *pasemi_mac_get_stats(struct net_device *dev)
 804 {
 805         struct pasemi_mac *mac = netdev_priv(dev);
 806
 807         return &mac->stats;
 808 }
 809
 810 static void pasemi_mac_set_rx_mode(struct net_device *dev)
 811 {
 812         struct pasemi_mac *mac = netdev_priv(dev);
 813         unsigned int flags;
 814
 815         pci_read_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, &flags);
 816
 817         /* Set promiscuous */
 818         if (dev->flags & IFF_PROMISC)
 819                 flags |= PAS_MAC_CFG_PCFG_PR;
 820         else
 821                 flags &= ~PAS_MAC_CFG_PCFG_PR;
 822
 823         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 824 }
 825
 826
 827 static int pasemi_mac_poll(struct net_device *dev, int *budget)
 828 {
 829         int pkts, limit = min(*budget, dev->quota);
 830         struct pasemi_mac *mac = netdev_priv(dev);
 831
 832         pkts = pasemi_mac_clean_rx(mac, limit);
 833
 834         if (pkts < limit) {
 835                 /* all done, no more packets present */
 836                 netif_rx_complete(dev);
 837
 838                 /* re-enable receive interrupts */
 839                 pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 840                                        PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(1000000));
 841                 return 0;
 842         } else {
 843                 /* used up our quantum, so reschedule */
 844                 dev->quota -= pkts;
 845                 *budget -= pkts;
 846                 return 1;
 847         }
 848 }
 849
 850 static int __devinit
 851 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 852 {
 853         static int index = 0;
 854         struct net_device *dev;
 855         struct pasemi_mac *mac;
 856         int err;
 857
 858         err = pci_enable_device(pdev);
 859         if (err)
 860                 return err;
 861
 862         dev = alloc_etherdev(sizeof(struct pasemi_mac));
 863         if (dev == NULL) {
 864                 dev_err(&pdev->dev,
 865                         "pasemi_mac: Could not allocate ethernet device.\n");
 866                 err = -ENOMEM;
 867                 goto out_disable_device;
 868         }
 869
 870         SET_MODULE_OWNER(dev);
 871         pci_set_drvdata(pdev, dev);
 872         SET_NETDEV_DEV(dev, &pdev->dev);
 873
 874         mac = netdev_priv(dev);
 875
 876         mac->pdev = pdev;
 877         mac->netdev = dev;
 878         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
 879
 880         if (!mac->dma_pdev) {
 881                 dev_err(&pdev->dev, "Can't find DMA Controller\n");
 882                 err = -ENODEV;
 883                 goto out_free_netdev;
 884         }
 885
 886         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
 887
 888         if (!mac->iob_pdev) {
 889                 dev_err(&pdev->dev, "Can't find I/O Bridge\n");
 890                 err = -ENODEV;
 891                 goto out_put_dma_pdev;
 892         }
 893
 894         /* These should come out of the device tree eventually */
 895         mac->dma_txch = index;
 896         mac->dma_rxch = index;
 897
 898         /* We probe GMAC before XAUI, but the DMA interfaces are
 899          * in XAUI, GMAC order.
 900          */
 901         if (index < 4)
 902                 mac->dma_if = index + 2;
 903         else
 904                 mac->dma_if = index - 4;
 905         index++;
 906
 907         switch (pdev->device) {
 908         case 0xa005:
 909                 mac->type = MAC_TYPE_GMAC;
 910                 break;
 911         case 0xa006:
 912                 mac->type = MAC_TYPE_XAUI;
 913                 break;
 914         default:
 915                 err = -ENODEV;
 916                 goto out;
 917         }
 918
 919         /* get mac addr from device tree */
 920         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
 921                 err = -ENODEV;
 922                 goto out;
 923         }
 924         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
 925
 926         dev->open = pasemi_mac_open;
 927         dev->stop = pasemi_mac_close;
 928         dev->hard_start_xmit = pasemi_mac_start_tx;
 929         dev->get_stats = pasemi_mac_get_stats;
 930         dev->set_multicast_list = pasemi_mac_set_rx_mode;
 931         dev->weight = 64;
 932         dev->poll = pasemi_mac_poll;
 933         dev->features = NETIF_F_HW_CSUM;
 934
 935         /* The dma status structure is located in the I/O bridge, and
 936          * is cache coherent.
 937          */
 938         if (!dma_status)
 939                 /* XXXOJN This should come from the device tree */
 940                 dma_status = __ioremap(0xfd800000, 0x1000, 0);
 941
 942         mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
 943         mac->tx_status = &dma_status->tx_sta[mac->dma_txch];
 944
 945         err = register_netdev(dev);
 946
 947         if (err) {
 948                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
 949                         err);
 950                 goto out;
 951         } else
 952                 printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
 953                        "hw addr %02x:%02x:%02x:%02x:%02x:%02x\n",
 954                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
 955                        mac->dma_if, mac->dma_txch, mac->dma_rxch,
 956                        dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
 957                        dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
 958
 959         return err;
 960
 961 out:
 962         pci_dev_put(mac->iob_pdev);
 963 out_put_dma_pdev:
 964         pci_dev_put(mac->dma_pdev);
 965 out_free_netdev:
 966         free_netdev(dev);
 967 out_disable_device:
 968         pci_disable_device(pdev);
 969         return err;
 970
 971 }
 972
 973 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
 974 {
 975         struct net_device *netdev = pci_get_drvdata(pdev);
 976         struct pasemi_mac *mac;
 977
 978         if (!netdev)
 979                 return;
 980
 981         mac = netdev_priv(netdev);
 982
 983         unregister_netdev(netdev);
 984
 985         pci_disable_device(pdev);
 986         pci_dev_put(mac->dma_pdev);
 987         pci_dev_put(mac->iob_pdev);
 988
 989         pci_set_drvdata(pdev, NULL);
 990         free_netdev(netdev);
 991 }
 992
 993 static struct pci_device_id pasemi_mac_pci_tbl[] = {
 994         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
 995         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
 996 };
 997
 998 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
 999
1000 static struct pci_driver pasemi_mac_driver = {
1001         .name           = "pasemi_mac",
1002         .id_table       = pasemi_mac_pci_tbl,
1003         .probe          = pasemi_mac_probe,
1004         .remove         = __devexit_p(pasemi_mac_remove),
1005 };
1006
1007 static void __exit pasemi_mac_cleanup_module(void)
1008 {
1009         pci_unregister_driver(&pasemi_mac_driver);
1010         __iounmap(dma_status);
1011         dma_status = NULL;
1012 }
1013
1014 int pasemi_mac_init_module(void)
1015 {
1016         return pci_register_driver(&pasemi_mac_driver);
1017 }
1018
1019 MODULE_LICENSE("GPL");
1020 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
1021 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
1022
1023 module_init(pasemi_mac_init_module);
1024 module_exit(pasemi_mac_cleanup_module);