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->skb) {
 283                         if (info->dma) {
 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 might still be in there for recycle on short receives */
 333                 if (info->skb)
 334                         skb = info->skb;
 335                 else
 336                         skb = dev_alloc_skb(BUF_SIZE);
 337
 338                 if (unlikely(!skb))
 339                         break;
 340
 341                 dma = pci_map_single(mac->dma_pdev, skb->data, skb->len,
 342                                      PCI_DMA_FROMDEVICE);
 343
 344                 if (dma_mapping_error(dma)) {
 345                         dev_kfree_skb_irq(info->skb);
 346                         count = i - start;
 347                         break;
 348                 }
 349
 350                 info->skb = skb;
 351                 info->dma = dma;
 352                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
 353         }
 354
 355         wmb();
 356
 357         pci_write_config_dword(mac->dma_pdev,
 358                                PAS_DMA_RXCHAN_INCR(mac->dma_rxch),
 359                                count);
 360         pci_write_config_dword(mac->dma_pdev,
 361                                PAS_DMA_RXINT_INCR(mac->dma_if),
 362                                count);
 363
 364         mac->rx->next_to_fill += count;
 365 }
 366
 367 static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
 368 {
 369         unsigned int reg, stat;
 370         /* Re-enable packet count interrupts: finally
 371          * ack the packet count interrupt we got in rx_intr.
 372          */
 373
 374         pci_read_config_dword(mac->iob_pdev,
 375                               PAS_IOB_DMA_RXCH_STAT(mac->dma_rxch),
 376                               &stat);
 377
 378         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(stat & PAS_IOB_DMA_RXCH_STAT_CNTDEL_M)
 379                 | PAS_IOB_DMA_RXCH_RESET_PINTC;
 380
 381         pci_write_config_dword(mac->iob_pdev,
 382                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch),
 383                                reg);
 384 }
 385
 386 static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
 387 {
 388         unsigned int reg, stat;
 389
 390         /* Re-enable packet count interrupts */
 391         pci_read_config_dword(mac->iob_pdev,
 392                               PAS_IOB_DMA_TXCH_STAT(mac->dma_txch), &stat);
 393
 394         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(stat & PAS_IOB_DMA_TXCH_STAT_CNTDEL_M)
 395                 | PAS_IOB_DMA_TXCH_RESET_PINTC;
 396
 397         pci_write_config_dword(mac->iob_pdev,
 398                                PAS_IOB_DMA_TXCH_RESET(mac->dma_txch), reg);
 399 }
 400
 401
 402
 403 static int pasemi_mac_clean_rx(struct pasemi_mac *mac, int limit)
 404 {
 405         unsigned int i;
 406         int start, count;
 407
 408         spin_lock(&mac->rx->lock);
 409
 410         start = mac->rx->next_to_clean;
 411         count = 0;
 412
 413         for (i = start; i < (start + RX_RING_SIZE) && count < limit; i++) {
 414                 struct pas_dma_xct_descr *dp;
 415                 struct pasemi_mac_buffer *info;
 416                 struct sk_buff *skb;
 417                 unsigned int j, len;
 418                 dma_addr_t dma;
 419
 420                 rmb();
 421
 422                 dp = &RX_DESC(mac, i);
 423
 424                 if (!(dp->macrx & XCT_MACRX_O))
 425                         break;
 426
 427                 count++;
 428
 429                 info = NULL;
 430
 431                 /* We have to scan for our skb since there's no way
 432                  * to back-map them from the descriptor, and if we
 433                  * have several receive channels then they might not
 434                  * show up in the same order as they were put on the
 435                  * interface ring.
 436                  */
 437
 438                 dma = (dp->ptr & XCT_PTR_ADDR_M);
 439                 for (j = start; j < (start + RX_RING_SIZE); j++) {
 440                         info = &RX_DESC_INFO(mac, j);
 441                         if (info->dma == dma)
 442                                 break;
 443                 }
 444
 445                 BUG_ON(!info);
 446                 BUG_ON(info->dma != dma);
 447                 skb = info->skb;
 448
 449                 pci_unmap_single(mac->dma_pdev, info->dma, info->skb->len,
 450                                  PCI_DMA_FROMDEVICE);
 451                 info->dma = 0;
 452
 453
 454                 len = (dp->macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 455                 if (len < 256) {
 456                         struct sk_buff *new_skb =
 457                             netdev_alloc_skb(mac->netdev, len + NET_IP_ALIGN);
 458                         if (new_skb) {
 459                                 skb_reserve(new_skb, NET_IP_ALIGN);
 460                                 memcpy(new_skb->data - NET_IP_ALIGN,
 461                                         skb->data - NET_IP_ALIGN,
 462                                         len + NET_IP_ALIGN);
 463                                 /* save the skb in buffer_info as good */
 464                                 skb = new_skb;
 465                         }
 466                         /* else just continue with the old one */
 467                 } else
 468                         info->skb = NULL;
 469
 470                 skb_put(skb, len);
 471
 472                 skb->protocol = eth_type_trans(skb, mac->netdev);
 473
 474                 if ((dp->macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK) {
 475                         skb->ip_summed = CHECKSUM_COMPLETE;
 476                         skb->csum = (dp->macrx & XCT_MACRX_CSUM_M) >>
 477                                            XCT_MACRX_CSUM_S;
 478                 } else
 479                         skb->ip_summed = CHECKSUM_NONE;
 480
 481                 mac->stats.rx_bytes += len;
 482                 mac->stats.rx_packets++;
 483
 484                 netif_receive_skb(skb);
 485
 486                 info->dma = 0;
 487                 info->skb = NULL;
 488                 dp->ptr = 0;
 489                 dp->macrx = 0;
 490         }
 491
 492         mac->rx->next_to_clean += count;
 493         pasemi_mac_replenish_rx_ring(mac->netdev);
 494
 495         spin_unlock(&mac->rx->lock);
 496
 497         return count;
 498 }
 499
 500 static int pasemi_mac_clean_tx(struct pasemi_mac *mac)
 501 {
 502         int i;
 503         struct pasemi_mac_buffer *info;
 504         struct pas_dma_xct_descr *dp;
 505         int start, count;
 506         int flags;
 507
 508         spin_lock_irqsave(&mac->tx->lock, flags);
 509
 510         start = mac->tx->next_to_clean;
 511         count = 0;
 512
 513         for (i = start; i < mac->tx->next_to_use; i++) {
 514                 dp = &TX_DESC(mac, i);
 515                 if (!dp || (dp->mactx & XCT_MACTX_O))
 516                         break;
 517
 518                 count++;
 519
 520                 info = &TX_DESC_INFO(mac, i);
 521
 522                 pci_unmap_single(mac->dma_pdev, info->dma,
 523                                  info->skb->len, PCI_DMA_TODEVICE);
 524                 dev_kfree_skb_irq(info->skb);
 525
 526                 info->skb = NULL;
 527                 info->dma = 0;
 528                 dp->mactx = 0;
 529                 dp->ptr = 0;
 530         }
 531         mac->tx->next_to_clean += count;
 532         spin_unlock_irqrestore(&mac->tx->lock, flags);
 533
 534         netif_wake_queue(mac->netdev);
 535
 536         return count;
 537 }
 538
 539
 540 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 541 {
 542         struct net_device *dev = data;
 543         struct pasemi_mac *mac = netdev_priv(dev);
 544         unsigned int reg;
 545
 546         if (!(*mac->rx_status & PAS_STATUS_CAUSE_M))
 547                 return IRQ_NONE;
 548
 549         if (*mac->rx_status & PAS_STATUS_ERROR)
 550                 printk("rx_status reported error\n");
 551
 552         /* Don't reset packet count so it won't fire again but clear
 553          * all others.
 554          */
 555
 556         pci_read_config_dword(mac->dma_pdev, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), &reg);
 557
 558         reg = 0;
 559         if (*mac->rx_status & PAS_STATUS_SOFT)
 560                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
 561         if (*mac->rx_status & PAS_STATUS_ERROR)
 562                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
 563         if (*mac->rx_status & PAS_STATUS_TIMER)
 564                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 565
 566         netif_rx_schedule(dev);
 567
 568         pci_write_config_dword(mac->iob_pdev,
 569                                PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 570
 571
 572         return IRQ_HANDLED;
 573 }
 574
 575 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 576 {
 577         struct net_device *dev = data;
 578         struct pasemi_mac *mac = netdev_priv(dev);
 579         unsigned int reg;
 580
 581         if (!(*mac->tx_status & PAS_STATUS_CAUSE_M))
 582                 return IRQ_NONE;
 583
 584         pasemi_mac_clean_tx(mac);
 585
 586         reg = PAS_IOB_DMA_TXCH_RESET_PINTC;
 587
 588         if (*mac->tx_status & PAS_STATUS_SOFT)
 589                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
 590         if (*mac->tx_status & PAS_STATUS_ERROR)
 591                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 592
 593         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_RESET(mac->dma_txch),
 594                                reg);
 595
 596         return IRQ_HANDLED;
 597 }
 598
 599 static int pasemi_mac_open(struct net_device *dev)
 600 {
 601         struct pasemi_mac *mac = netdev_priv(dev);
 602         int base_irq;
 603         unsigned int flags;
 604         int ret;
 605
 606         /* enable rx section */
 607         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_RXCMD,
 608                                PAS_DMA_COM_RXCMD_EN);
 609
 610         /* enable tx section */
 611         pci_write_config_dword(mac->dma_pdev, PAS_DMA_COM_TXCMD,
 612                                PAS_DMA_COM_TXCMD_EN);
 613
 614         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
 615                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
 616                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
 617
 618         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_TXP, flags);
 619
 620         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 621                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
 622
 623         flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 624
 625         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 626                                PAS_IOB_DMA_RXCH_CFG_CNTTH(1));
 627
 628         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
 629                                PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
 630
 631         /* Clear out any residual packet count state from firmware */
 632         pasemi_mac_restart_rx_intr(mac);
 633         pasemi_mac_restart_tx_intr(mac);
 634
 635         /* 0xffffff is max value, about 16ms */
 636         pci_write_config_dword(mac->iob_pdev, PAS_IOB_DMA_COM_TIMEOUTCFG,
 637                                PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
 638
 639         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 640
 641         ret = pasemi_mac_setup_rx_resources(dev);
 642         if (ret)
 643                 goto out_rx_resources;
 644
 645         ret = pasemi_mac_setup_tx_resources(dev);
 646         if (ret)
 647                 goto out_tx_resources;
 648
 649         pci_write_config_dword(mac->pdev, PAS_MAC_IPC_CHNL,
 650                                PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
 651                                PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
 652
 653         /* enable rx if */
 654         pci_write_config_dword(mac->dma_pdev,
 655                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 656                                PAS_DMA_RXINT_RCMDSTA_EN);
 657
 658         /* enable rx channel */
 659         pci_write_config_dword(mac->dma_pdev,
 660                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 661                                PAS_DMA_RXCHAN_CCMDSTA_EN |
 662                                PAS_DMA_RXCHAN_CCMDSTA_DU);
 663
 664         /* enable tx channel */
 665         pci_write_config_dword(mac->dma_pdev,
 666                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 667                                PAS_DMA_TXCHAN_TCMDSTA_EN);
 668
 669         pasemi_mac_replenish_rx_ring(dev);
 670
 671         netif_start_queue(dev);
 672         netif_poll_enable(dev);
 673
 674         /* Interrupts are a bit different for our DMA controller: While
 675          * it's got one a regular PCI device header, the interrupt there
 676          * is really the base of the range it's using. Each tx and rx
 677          * channel has it's own interrupt source.
 678          */
 679
 680         base_irq = virq_to_hw(mac->dma_pdev->irq);
 681
 682         mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
 683         mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_txch);
 684
 685         ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
 686                           mac->tx->irq_name, dev);
 687         if (ret) {
 688                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 689                         base_irq + mac->dma_txch, ret);
 690                 goto out_tx_int;
 691         }
 692
 693         ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
 694                           mac->rx->irq_name, dev);
 695         if (ret) {
 696                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
 697                         base_irq + 20 + mac->dma_rxch, ret);
 698                 goto out_rx_int;
 699         }
 700
 701         return 0;
 702
 703 out_rx_int:
 704         free_irq(mac->tx_irq, dev);
 705 out_tx_int:
 706         netif_poll_disable(dev);
 707         netif_stop_queue(dev);
 708         pasemi_mac_free_tx_resources(dev);
 709 out_tx_resources:
 710         pasemi_mac_free_rx_resources(dev);
 711 out_rx_resources:
 712
 713         return ret;
 714 }
 715
 716 #define MAX_RETRIES 5000
 717
 718 static int pasemi_mac_close(struct net_device *dev)
 719 {
 720         struct pasemi_mac *mac = netdev_priv(dev);
 721         unsigned int stat;
 722         int retries;
 723
 724         netif_stop_queue(dev);
 725
 726         /* Clean out any pending buffers */
 727         pasemi_mac_clean_tx(mac);
 728         pasemi_mac_clean_rx(mac, RX_RING_SIZE);
 729
 730         /* Disable interface */
 731         pci_write_config_dword(mac->dma_pdev,
 732                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 733                                PAS_DMA_TXCHAN_TCMDSTA_ST);
 734         pci_write_config_dword(mac->dma_pdev,
 735                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 736                       PAS_DMA_RXINT_RCMDSTA_ST);
 737         pci_write_config_dword(mac->dma_pdev,
 738                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 739                       PAS_DMA_RXCHAN_CCMDSTA_ST);
 740
 741         for (retries = 0; retries < MAX_RETRIES; retries++) {
 742                 pci_read_config_dword(mac->dma_pdev,
 743                                       PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 744                                       &stat);
 745                 if (!(stat & PAS_DMA_TXCHAN_TCMDSTA_ACT))
 746                         break;
 747                 cond_resched();
 748         }
 749
 750         if (stat & PAS_DMA_TXCHAN_TCMDSTA_ACT)
 751                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
 752
 753         for (retries = 0; retries < MAX_RETRIES; retries++) {
 754                 pci_read_config_dword(mac->dma_pdev,
 755                                       PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 756                                       &stat);
 757                 if (!(stat & PAS_DMA_RXCHAN_CCMDSTA_ACT))
 758                         break;
 759                 cond_resched();
 760         }
 761
 762         if (stat & PAS_DMA_RXCHAN_CCMDSTA_ACT)
 763                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
 764
 765         for (retries = 0; retries < MAX_RETRIES; retries++) {
 766                 pci_read_config_dword(mac->dma_pdev,
 767                                       PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 768                                       &stat);
 769                 if (!(stat & PAS_DMA_RXINT_RCMDSTA_ACT))
 770                         break;
 771                 cond_resched();
 772         }
 773
 774         if (stat & PAS_DMA_RXINT_RCMDSTA_ACT)
 775                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
 776
 777         /* Then, disable the channel. This must be done separately from
 778          * stopping, since you can't disable when active.
 779          */
 780
 781         pci_write_config_dword(mac->dma_pdev,
 782                                PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
 783         pci_write_config_dword(mac->dma_pdev,
 784                                PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
 785         pci_write_config_dword(mac->dma_pdev,
 786                                PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
 787
 788         free_irq(mac->tx_irq, dev);
 789         free_irq(mac->rx_irq, dev);
 790
 791         /* Free resources */
 792         pasemi_mac_free_rx_resources(dev);
 793         pasemi_mac_free_tx_resources(dev);
 794
 795         return 0;
 796 }
 797
 798 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
 799 {
 800         struct pasemi_mac *mac = netdev_priv(dev);
 801         struct pasemi_mac_txring *txring;
 802         struct pasemi_mac_buffer *info;
 803         struct pas_dma_xct_descr *dp;
 804         u64 dflags;
 805         dma_addr_t map;
 806         int flags;
 807
 808         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_SS | XCT_MACTX_CRC_PAD;
 809
 810         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 811                 const unsigned char *nh = skb_network_header(skb);
 812
 813                 switch (ip_hdr(skb)->protocol) {
 814                 case IPPROTO_TCP:
 815                         dflags |= XCT_MACTX_CSUM_TCP;
 816                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 817                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 818                         break;
 819                 case IPPROTO_UDP:
 820                         dflags |= XCT_MACTX_CSUM_UDP;
 821                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
 822                         dflags |= XCT_MACTX_IPO(nh - skb->data);
 823                         break;
 824                 }
 825         }
 826
 827         map = pci_map_single(mac->dma_pdev, skb->data, skb->len, PCI_DMA_TODEVICE);
 828
 829         if (dma_mapping_error(map))
 830                 return NETDEV_TX_BUSY;
 831
 832         txring = mac->tx;
 833
 834         spin_lock_irqsave(&txring->lock, flags);
 835
 836         if (txring->next_to_clean - txring->next_to_use == TX_RING_SIZE) {
 837                 spin_unlock_irqrestore(&txring->lock, flags);
 838                 pasemi_mac_clean_tx(mac);
 839                 spin_lock_irqsave(&txring->lock, flags);
 840
 841                 if (txring->next_to_clean - txring->next_to_use ==
 842                     TX_RING_SIZE) {
 843                         /* Still no room -- stop the queue and wait for tx
 844                          * intr when there's room.
 845                          */
 846                         netif_stop_queue(dev);
 847                         goto out_err;
 848                 }
 849         }
 850
 851
 852         dp = &TX_DESC(mac, txring->next_to_use);
 853         info = &TX_DESC_INFO(mac, txring->next_to_use);
 854
 855         dp->mactx = dflags | XCT_MACTX_LLEN(skb->len);
 856         dp->ptr   = XCT_PTR_LEN(skb->len) | XCT_PTR_ADDR(map);
 857         info->dma = map;
 858         info->skb = skb;
 859
 860         txring->next_to_use++;
 861         mac->stats.tx_packets++;
 862         mac->stats.tx_bytes += skb->len;
 863
 864         spin_unlock_irqrestore(&txring->lock, flags);
 865
 866         pci_write_config_dword(mac->dma_pdev,
 867                                PAS_DMA_TXCHAN_INCR(mac->dma_txch), 1);
 868
 869         return NETDEV_TX_OK;
 870
 871 out_err:
 872         spin_unlock_irqrestore(&txring->lock, flags);
 873         pci_unmap_single(mac->dma_pdev, map, skb->len, PCI_DMA_TODEVICE);
 874         return NETDEV_TX_BUSY;
 875 }
 876
 877 static struct net_device_stats *pasemi_mac_get_stats(struct net_device *dev)
 878 {
 879         struct pasemi_mac *mac = netdev_priv(dev);
 880
 881         return &mac->stats;
 882 }
 883
 884 static void pasemi_mac_set_rx_mode(struct net_device *dev)
 885 {
 886         struct pasemi_mac *mac = netdev_priv(dev);
 887         unsigned int flags;
 888
 889         pci_read_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, &flags);
 890
 891         /* Set promiscuous */
 892         if (dev->flags & IFF_PROMISC)
 893                 flags |= PAS_MAC_CFG_PCFG_PR;
 894         else
 895                 flags &= ~PAS_MAC_CFG_PCFG_PR;
 896
 897         pci_write_config_dword(mac->pdev, PAS_MAC_CFG_PCFG, flags);
 898 }
 899
 900
 901 static int pasemi_mac_poll(struct net_device *dev, int *budget)
 902 {
 903         int pkts, limit = min(*budget, dev->quota);
 904         struct pasemi_mac *mac = netdev_priv(dev);
 905
 906         pkts = pasemi_mac_clean_rx(mac, limit);
 907
 908         if (pkts < limit) {
 909                 /* all done, no more packets present */
 910                 netif_rx_complete(dev);
 911
 912                 pasemi_mac_restart_rx_intr(mac);
 913                 return 0;
 914         } else {
 915                 /* used up our quantum, so reschedule */
 916                 dev->quota -= pkts;
 917                 *budget -= pkts;
 918                 return 1;
 919         }
 920 }
 921
 922 static int __devinit
 923 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 924 {
 925         static int index = 0;
 926         struct net_device *dev;
 927         struct pasemi_mac *mac;
 928         int err;
 929
 930         err = pci_enable_device(pdev);
 931         if (err)
 932                 return err;
 933
 934         dev = alloc_etherdev(sizeof(struct pasemi_mac));
 935         if (dev == NULL) {
 936                 dev_err(&pdev->dev,
 937                         "pasemi_mac: Could not allocate ethernet device.\n");
 938                 err = -ENOMEM;
 939                 goto out_disable_device;
 940         }
 941
 942         SET_MODULE_OWNER(dev);
 943         pci_set_drvdata(pdev, dev);
 944         SET_NETDEV_DEV(dev, &pdev->dev);
 945
 946         mac = netdev_priv(dev);
 947
 948         mac->pdev = pdev;
 949         mac->netdev = dev;
 950         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
 951
 952         if (!mac->dma_pdev) {
 953                 dev_err(&pdev->dev, "Can't find DMA Controller\n");
 954                 err = -ENODEV;
 955                 goto out_free_netdev;
 956         }
 957
 958         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
 959
 960         if (!mac->iob_pdev) {
 961                 dev_err(&pdev->dev, "Can't find I/O Bridge\n");
 962                 err = -ENODEV;
 963                 goto out_put_dma_pdev;
 964         }
 965
 966         /* These should come out of the device tree eventually */
 967         mac->dma_txch = index;
 968         mac->dma_rxch = index;
 969
 970         /* We probe GMAC before XAUI, but the DMA interfaces are
 971          * in XAUI, GMAC order.
 972          */
 973         if (index < 4)
 974                 mac->dma_if = index + 2;
 975         else
 976                 mac->dma_if = index - 4;
 977         index++;
 978
 979         switch (pdev->device) {
 980         case 0xa005:
 981                 mac->type = MAC_TYPE_GMAC;
 982                 break;
 983         case 0xa006:
 984                 mac->type = MAC_TYPE_XAUI;
 985                 break;
 986         default:
 987                 err = -ENODEV;
 988                 goto out;
 989         }
 990
 991         /* get mac addr from device tree */
 992         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
 993                 err = -ENODEV;
 994                 goto out;
 995         }
 996         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
 997
 998         dev->open = pasemi_mac_open;
 999         dev->stop = pasemi_mac_close;
1000         dev->hard_start_xmit = pasemi_mac_start_tx;
1001         dev->get_stats = pasemi_mac_get_stats;
1002         dev->set_multicast_list = pasemi_mac_set_rx_mode;
1003         dev->weight = 64;
1004         dev->poll = pasemi_mac_poll;
1005         dev->features = NETIF_F_HW_CSUM;
1006
1007         /* The dma status structure is located in the I/O bridge, and
1008          * is cache coherent.
1009          */
1010         if (!dma_status)
1011                 /* XXXOJN This should come from the device tree */
1012                 dma_status = __ioremap(0xfd800000, 0x1000, 0);
1013
1014         mac->rx_status = &dma_status->rx_sta[mac->dma_rxch];
1015         mac->tx_status = &dma_status->tx_sta[mac->dma_txch];
1016
1017         err = register_netdev(dev);
1018
1019         if (err) {
1020                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1021                         err);
1022                 goto out;
1023         } else
1024                 printk(KERN_INFO "%s: PA Semi %s: intf %d, txch %d, rxch %d, "
1025                        "hw addr %02x:%02x:%02x:%02x:%02x:%02x\n",
1026                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1027                        mac->dma_if, mac->dma_txch, mac->dma_rxch,
1028                        dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
1029                        dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
1030
1031         return err;
1032
1033 out:
1034         pci_dev_put(mac->iob_pdev);
1035 out_put_dma_pdev:
1036         pci_dev_put(mac->dma_pdev);
1037 out_free_netdev:
1038         free_netdev(dev);
1039 out_disable_device:
1040         pci_disable_device(pdev);
1041         return err;
1042
1043 }
1044
1045 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1046 {
1047         struct net_device *netdev = pci_get_drvdata(pdev);
1048         struct pasemi_mac *mac;
1049
1050         if (!netdev)
1051                 return;
1052
1053         mac = netdev_priv(netdev);
1054
1055         unregister_netdev(netdev);
1056
1057         pci_disable_device(pdev);
1058         pci_dev_put(mac->dma_pdev);
1059         pci_dev_put(mac->iob_pdev);
1060
1061         pci_set_drvdata(pdev, NULL);
1062         free_netdev(netdev);
1063 }
1064
1065 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1066         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1067         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1068 };
1069
1070 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1071
1072 static struct pci_driver pasemi_mac_driver = {
1073         .name           = "pasemi_mac",
1074         .id_table       = pasemi_mac_pci_tbl,
1075         .probe          = pasemi_mac_probe,
1076         .remove         = __devexit_p(pasemi_mac_remove),
1077 };
1078
1079 static void __exit pasemi_mac_cleanup_module(void)
1080 {
1081         pci_unregister_driver(&pasemi_mac_driver);
1082         __iounmap(dma_status);
1083         dma_status = NULL;
1084 }
1085
1086 int pasemi_mac_init_module(void)
1087 {
1088         return pci_register_driver(&pasemi_mac_driver);
1089 }
1090
1091 MODULE_LICENSE("GPL");
1092 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
1093 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
1094
1095 module_init(pasemi_mac_init_module);
1096 module_exit(pasemi_mac_cleanup_module);