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 #include <asm/firmware.h>
  38
  39 #include "pasemi_mac.h"
  40
  41 /* We have our own align, since ppc64 in general has it at 0 because
  42  * of design flaws in some of the server bridge chips. However, for
  43  * PWRficient doing the unaligned copies is more expensive than doing
  44  * unaligned DMA, so make sure the data is aligned instead.
  45  */
  46 #define LOCAL_SKB_ALIGN 2
  47
  48 /* TODO list
  49  *
  50  * - Multicast support
  51  * - Large MTU support
  52  * - SW LRO
  53  * - Multiqueue RX/TX
  54  */
  55
  56
  57 /* Must be a power of two */
  58 #define RX_RING_SIZE 4096
  59 #define TX_RING_SIZE 4096
  60
  61 #define DEFAULT_MSG_ENABLE        \
  62         (NETIF_MSG_DRV          | \
  63          NETIF_MSG_PROBE        | \
  64          NETIF_MSG_LINK         | \
  65          NETIF_MSG_TIMER        | \
  66          NETIF_MSG_IFDOWN       | \
  67          NETIF_MSG_IFUP         | \
  68          NETIF_MSG_RX_ERR       | \
  69          NETIF_MSG_TX_ERR)
  70
  71 #define TX_DESC(tx, num)        ((tx)->ring[(num) & (TX_RING_SIZE-1)])
  72 #define TX_DESC_INFO(tx, num)   ((tx)->ring_info[(num) & (TX_RING_SIZE-1)])
  73 #define RX_DESC(rx, num)        ((rx)->ring[(num) & (RX_RING_SIZE-1)])
  74 #define RX_DESC_INFO(rx, num)   ((rx)->ring_info[(num) & (RX_RING_SIZE-1)])
  75 #define RX_BUFF(rx, num)        ((rx)->buffers[(num) & (RX_RING_SIZE-1)])
  76
  77 #define RING_USED(ring)         (((ring)->next_to_fill - (ring)->next_to_clean) \
  78                                  & ((ring)->size - 1))
  79 #define RING_AVAIL(ring)        ((ring->size) - RING_USED(ring))
  80
  81 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
  82
  83 MODULE_LICENSE("GPL");
  84 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
  85 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
  86
  87 static int debug = -1;  /* -1 == use DEFAULT_MSG_ENABLE as value */
  88 module_param(debug, int, 0);
  89 MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
  90
  91 static struct pasdma_status *dma_status;
  92
  93 static int translation_enabled(void)
  94 {
  95 #if defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE)
  96         return 1;
  97 #else
  98         return firmware_has_feature(FW_FEATURE_LPAR);
  99 #endif
 100 }
 101
 102 static void write_iob_reg(struct pasemi_mac *mac, unsigned int reg,
 103                           unsigned int val)
 104 {
 105         out_le32(mac->iob_regs+reg, val);
 106 }
 107
 108 static unsigned int read_mac_reg(struct pasemi_mac *mac, unsigned int reg)
 109 {
 110         return in_le32(mac->regs+reg);
 111 }
 112
 113 static void write_mac_reg(struct pasemi_mac *mac, unsigned int reg,
 114                           unsigned int val)
 115 {
 116         out_le32(mac->regs+reg, val);
 117 }
 118
 119 static unsigned int read_dma_reg(struct pasemi_mac *mac, unsigned int reg)
 120 {
 121         return in_le32(mac->dma_regs+reg);
 122 }
 123
 124 static void write_dma_reg(struct pasemi_mac *mac, unsigned int reg,
 125                           unsigned int val)
 126 {
 127         out_le32(mac->dma_regs+reg, val);
 128 }
 129
 130 static struct pasemi_mac_rxring *rx_ring(struct pasemi_mac *mac)
 131 {
 132         return mac->rx;
 133 }
 134
 135 static struct pasemi_mac_txring *tx_ring(struct pasemi_mac *mac)
 136 {
 137         return mac->tx;
 138 }
 139
 140 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
 141 {
 142         struct pci_dev *pdev = mac->pdev;
 143         struct device_node *dn = pci_device_to_OF_node(pdev);
 144         int len;
 145         const u8 *maddr;
 146         u8 addr[6];
 147
 148         if (!dn) {
 149                 dev_dbg(&pdev->dev,
 150                           "No device node for mac, not configuring\n");
 151                 return -ENOENT;
 152         }
 153
 154         maddr = of_get_property(dn, "local-mac-address", &len);
 155
 156         if (maddr && len == 6) {
 157                 memcpy(mac->mac_addr, maddr, 6);
 158                 return 0;
 159         }
 160
 161         /* Some old versions of firmware mistakenly uses mac-address
 162          * (and as a string) instead of a byte array in local-mac-address.
 163          */
 164
 165         if (maddr == NULL)
 166                 maddr = of_get_property(dn, "mac-address", NULL);
 167
 168         if (maddr == NULL) {
 169                 dev_warn(&pdev->dev,
 170                          "no mac address in device tree, not configuring\n");
 171                 return -ENOENT;
 172         }
 173
 174
 175         if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
 176                    &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
 177                 dev_warn(&pdev->dev,
 178                          "can't parse mac address, not configuring\n");
 179                 return -EINVAL;
 180         }
 181
 182         memcpy(mac->mac_addr, addr, 6);
 183
 184         return 0;
 185 }
 186
 187 static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
 188                                     struct sk_buff *skb,
 189                                     dma_addr_t *dmas)
 190 {
 191         int f;
 192         int nfrags = skb_shinfo(skb)->nr_frags;
 193
 194         pci_unmap_single(mac->dma_pdev, dmas[0], skb_headlen(skb),
 195                          PCI_DMA_TODEVICE);
 196
 197         for (f = 0; f < nfrags; f++) {
 198                 skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
 199
 200                 pci_unmap_page(mac->dma_pdev, dmas[f+1], frag->size,
 201                                PCI_DMA_TODEVICE);
 202         }
 203         dev_kfree_skb_irq(skb);
 204
 205         /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
 206          * aligned up to a power of 2
 207          */
 208         return (nfrags + 3) & ~1;
 209 }
 210
 211 static int pasemi_mac_setup_rx_resources(struct net_device *dev)
 212 {
 213         struct pasemi_mac_rxring *ring;
 214         struct pasemi_mac *mac = netdev_priv(dev);
 215         int chan_id = mac->dma_rxch;
 216         unsigned int cfg;
 217
 218         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 219
 220         if (!ring)
 221                 goto out_ring;
 222
 223         spin_lock_init(&ring->lock);
 224
 225         ring->size = RX_RING_SIZE;
 226         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 227                                   RX_RING_SIZE, GFP_KERNEL);
 228
 229         if (!ring->ring_info)
 230                 goto out_ring_info;
 231
 232         /* Allocate descriptors */
 233         ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
 234                                         RX_RING_SIZE * sizeof(u64),
 235                                         &ring->dma, GFP_KERNEL);
 236
 237         if (!ring->ring)
 238                 goto out_ring_desc;
 239
 240         memset(ring->ring, 0, RX_RING_SIZE * sizeof(u64));
 241
 242         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
 243                                            RX_RING_SIZE * sizeof(u64),
 244                                            &ring->buf_dma, GFP_KERNEL);
 245         if (!ring->buffers)
 246                 goto out_buffers;
 247
 248         memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
 249
 250         write_dma_reg(mac, PAS_DMA_RXCHAN_BASEL(chan_id), PAS_DMA_RXCHAN_BASEL_BRBL(ring->dma));
 251
 252         write_dma_reg(mac, PAS_DMA_RXCHAN_BASEU(chan_id),
 253                            PAS_DMA_RXCHAN_BASEU_BRBH(ring->dma >> 32) |
 254                            PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
 255
 256         cfg = PAS_DMA_RXCHAN_CFG_HBU(2);
 257
 258         if (translation_enabled())
 259                 cfg |= PAS_DMA_RXCHAN_CFG_CTR;
 260
 261         write_dma_reg(mac, PAS_DMA_RXCHAN_CFG(chan_id), cfg);
 262
 263         write_dma_reg(mac, PAS_DMA_RXINT_BASEL(mac->dma_if),
 264                            PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma));
 265
 266         write_dma_reg(mac, PAS_DMA_RXINT_BASEU(mac->dma_if),
 267                            PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) |
 268                            PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
 269
 270         cfg = PAS_DMA_RXINT_CFG_DHL(3) | PAS_DMA_RXINT_CFG_L2 |
 271               PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP |
 272               PAS_DMA_RXINT_CFG_HEN;
 273
 274         if (translation_enabled())
 275                 cfg |= PAS_DMA_RXINT_CFG_ITRR | PAS_DMA_RXINT_CFG_ITR;
 276
 277         write_dma_reg(mac, PAS_DMA_RXINT_CFG(mac->dma_if), cfg);
 278
 279         ring->next_to_fill = 0;
 280         ring->next_to_clean = 0;
 281
 282         ring->status = &dma_status->rx_sta[mac->dma_rxch];
 283         ring->mac = mac;
 284         mac->rx = ring;
 285
 286         return 0;
 287
 288 out_buffers:
 289         dma_free_coherent(&mac->dma_pdev->dev,
 290                           RX_RING_SIZE * sizeof(u64),
 291                           rx_ring(mac)->ring, rx_ring(mac)->dma);
 292 out_ring_desc:
 293         kfree(ring->ring_info);
 294 out_ring_info:
 295         kfree(ring);
 296 out_ring:
 297         return -ENOMEM;
 298 }
 299
 300 static struct pasemi_mac_txring *
 301 pasemi_mac_setup_tx_resources(struct net_device *dev, int txch)
 302 {
 303         struct pasemi_mac *mac = netdev_priv(dev);
 304         u32 val;
 305         struct pasemi_mac_txring *ring;
 306         unsigned int cfg;
 307
 308         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
 309         if (!ring)
 310                 goto out_ring;
 311
 312         spin_lock_init(&ring->lock);
 313
 314         ring->size = TX_RING_SIZE;
 315         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 316                                   TX_RING_SIZE, GFP_KERNEL);
 317         if (!ring->ring_info)
 318                 goto out_ring_info;
 319
 320         /* Allocate descriptors */
 321         ring->ring = dma_alloc_coherent(&mac->dma_pdev->dev,
 322                                         TX_RING_SIZE * sizeof(u64),
 323                                         &ring->dma, GFP_KERNEL);
 324         if (!ring->ring)
 325                 goto out_ring_desc;
 326
 327         memset(ring->ring, 0, TX_RING_SIZE * sizeof(u64));
 328
 329         write_dma_reg(mac, PAS_DMA_TXCHAN_BASEL(txch),
 330                            PAS_DMA_TXCHAN_BASEL_BRBL(ring->dma));
 331         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->dma >> 32);
 332         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
 333
 334         write_dma_reg(mac, PAS_DMA_TXCHAN_BASEU(txch), val);
 335
 336         cfg = PAS_DMA_TXCHAN_CFG_TY_IFACE |
 337               PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
 338               PAS_DMA_TXCHAN_CFG_UP |
 339               PAS_DMA_TXCHAN_CFG_WT(2);
 340
 341         if (translation_enabled())
 342                 cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
 343
 344         write_dma_reg(mac, PAS_DMA_TXCHAN_CFG(txch), cfg);
 345
 346         ring->next_to_fill = 0;
 347         ring->next_to_clean = 0;
 348         ring->status = &dma_status->tx_sta[txch];
 349         ring->chan = txch;
 350         ring->mac = mac;
 351
 352         return ring;
 353
 354 out_ring_desc:
 355         kfree(ring->ring_info);
 356 out_ring_info:
 357         kfree(ring);
 358 out_ring:
 359         return NULL;
 360 }
 361
 362 static void pasemi_mac_free_tx_resources(struct pasemi_mac *mac)
 363 {
 364         struct pasemi_mac_txring *txring = tx_ring(mac);
 365         unsigned int i, j;
 366         struct pasemi_mac_buffer *info;
 367         dma_addr_t dmas[MAX_SKB_FRAGS+1];
 368         int freed;
 369         int start, limit;
 370
 371         start = txring->next_to_clean;
 372         limit = txring->next_to_fill;
 373
 374         /* Compensate for when fill has wrapped and clean has not */
 375         if (start > limit)
 376                 limit += TX_RING_SIZE;
 377
 378         for (i = start; i < limit; i += freed) {
 379                 info = &txring->ring_info[(i+1) & (TX_RING_SIZE-1)];
 380                 if (info->dma && info->skb) {
 381                         for (j = 0; j <= skb_shinfo(info->skb)->nr_frags; j++)
 382                                 dmas[j] = txring->ring_info[(i+1+j) &
 383                                                 (TX_RING_SIZE-1)].dma;
 384                         freed = pasemi_mac_unmap_tx_skb(mac, info->skb, dmas);
 385                 } else
 386                         freed = 2;
 387         }
 388
 389         for (i = 0; i < TX_RING_SIZE; i++)
 390                 txring->ring[i] = 0;
 391
 392         dma_free_coherent(&mac->dma_pdev->dev,
 393                           TX_RING_SIZE * sizeof(u64),
 394                           txring->ring, txring->dma);
 395
 396         kfree(txring->ring_info);
 397         kfree(txring);
 398 }
 399
 400 static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac)
 401 {
 402         struct pasemi_mac_rxring *rx = rx_ring(mac);
 403         unsigned int i;
 404         struct pasemi_mac_buffer *info;
 405
 406         for (i = 0; i < RX_RING_SIZE; i++) {
 407                 info = &RX_DESC_INFO(rx, i);
 408                 if (info->skb && info->dma) {
 409                         pci_unmap_single(mac->dma_pdev,
 410                                          info->dma,
 411                                          info->skb->len,
 412                                          PCI_DMA_FROMDEVICE);
 413                         dev_kfree_skb_any(info->skb);
 414                 }
 415                 info->dma = 0;
 416                 info->skb = NULL;
 417         }
 418
 419         for (i = 0; i < RX_RING_SIZE; i++)
 420                 RX_DESC(rx, i) = 0;
 421
 422         dma_free_coherent(&mac->dma_pdev->dev,
 423                           RX_RING_SIZE * sizeof(u64),
 424                           rx_ring(mac)->ring, rx_ring(mac)->dma);
 425
 426         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
 427                           rx_ring(mac)->buffers, rx_ring(mac)->buf_dma);
 428
 429         kfree(rx_ring(mac)->ring_info);
 430         kfree(rx_ring(mac));
 431         mac->rx = NULL;
 432 }
 433
 434 static void pasemi_mac_replenish_rx_ring(struct net_device *dev, int limit)
 435 {
 436         struct pasemi_mac *mac = netdev_priv(dev);
 437         struct pasemi_mac_rxring *rx = rx_ring(mac);
 438         int fill, count;
 439
 440         if (limit <= 0)
 441                 return;
 442
 443         fill = rx_ring(mac)->next_to_fill;
 444         for (count = 0; count < limit; count++) {
 445                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(rx, fill);
 446                 u64 *buff = &RX_BUFF(rx, fill);
 447                 struct sk_buff *skb;
 448                 dma_addr_t dma;
 449
 450                 /* Entry in use? */
 451                 WARN_ON(*buff);
 452
 453                 /* skb might still be in there for recycle on short receives */
 454                 if (info->skb)
 455                         skb = info->skb;
 456                 else {
 457                         skb = dev_alloc_skb(BUF_SIZE);
 458                         skb_reserve(skb, LOCAL_SKB_ALIGN);
 459                 }
 460
 461                 if (unlikely(!skb))
 462                         break;
 463
 464                 dma = pci_map_single(mac->dma_pdev, skb->data,
 465                                      BUF_SIZE - LOCAL_SKB_ALIGN,
 466                                      PCI_DMA_FROMDEVICE);
 467
 468                 if (unlikely(dma_mapping_error(dma))) {
 469                         dev_kfree_skb_irq(info->skb);
 470                         break;
 471                 }
 472
 473                 info->skb = skb;
 474                 info->dma = dma;
 475                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
 476                 fill++;
 477         }
 478
 479         wmb();
 480
 481         write_dma_reg(mac, PAS_DMA_RXINT_INCR(mac->dma_if), count);
 482
 483         rx_ring(mac)->next_to_fill = (rx_ring(mac)->next_to_fill + count) &
 484                                 (RX_RING_SIZE - 1);
 485 }
 486
 487 static void pasemi_mac_restart_rx_intr(struct pasemi_mac *mac)
 488 {
 489         unsigned int reg, pcnt;
 490         /* Re-enable packet count interrupts: finally
 491          * ack the packet count interrupt we got in rx_intr.
 492          */
 493
 494         pcnt = *rx_ring(mac)->status & PAS_STATUS_PCNT_M;
 495
 496         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
 497
 498         write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 499 }
 500
 501 static void pasemi_mac_restart_tx_intr(struct pasemi_mac *mac)
 502 {
 503         unsigned int reg, pcnt;
 504
 505         /* Re-enable packet count interrupts */
 506         pcnt = *tx_ring(mac)->status & PAS_STATUS_PCNT_M;
 507
 508         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
 509
 510         write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(tx_ring(mac)->chan), reg);
 511 }
 512
 513
 514 static inline void pasemi_mac_rx_error(struct pasemi_mac *mac, u64 macrx)
 515 {
 516         unsigned int rcmdsta, ccmdsta;
 517
 518         if (!netif_msg_rx_err(mac))
 519                 return;
 520
 521         rcmdsta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
 522         ccmdsta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
 523
 524         printk(KERN_ERR "pasemi_mac: rx error. macrx %016lx, rx status %lx\n",
 525                 macrx, *rx_ring(mac)->status);
 526
 527         printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
 528                 rcmdsta, ccmdsta);
 529 }
 530
 531 static inline void pasemi_mac_tx_error(struct pasemi_mac *mac, u64 mactx)
 532 {
 533         unsigned int cmdsta;
 534
 535         if (!netif_msg_tx_err(mac))
 536                 return;
 537
 538         cmdsta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
 539
 540         printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016lx, "\
 541                 "tx status 0x%016lx\n", mactx, *tx_ring(mac)->status);
 542
 543         printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
 544 }
 545
 546 static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx, int limit)
 547 {
 548         struct pasemi_mac *mac = rx->mac;
 549         unsigned int n;
 550         int count;
 551         struct pasemi_mac_buffer *info;
 552         struct sk_buff *skb;
 553         unsigned int len;
 554         u64 macrx;
 555         dma_addr_t dma;
 556         int buf_index;
 557         u64 eval;
 558
 559         spin_lock(&rx->lock);
 560
 561         n = rx->next_to_clean;
 562
 563         prefetch(&RX_DESC(rx, n));
 564
 565         for (count = 0; count < limit; count++) {
 566                 macrx = RX_DESC(rx, n);
 567
 568                 if ((macrx & XCT_MACRX_E) ||
 569                     (*rx_ring(mac)->status & PAS_STATUS_ERROR))
 570                         pasemi_mac_rx_error(mac, macrx);
 571
 572                 if (!(macrx & XCT_MACRX_O))
 573                         break;
 574
 575                 info = NULL;
 576
 577                 BUG_ON(!(macrx & XCT_MACRX_RR_8BRES));
 578
 579                 eval = (RX_DESC(rx, n+1) & XCT_RXRES_8B_EVAL_M) >>
 580                         XCT_RXRES_8B_EVAL_S;
 581                 buf_index = eval-1;
 582
 583                 dma = (RX_DESC(rx, n+2) & XCT_PTR_ADDR_M);
 584                 info = &RX_DESC_INFO(rx, buf_index);
 585
 586                 skb = info->skb;
 587
 588                 prefetch(skb);
 589                 prefetch(&skb->data_len);
 590
 591                 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 592
 593                 pci_unmap_single(mac->dma_pdev, dma, len, PCI_DMA_FROMDEVICE);
 594
 595                 if (macrx & XCT_MACRX_CRC) {
 596                         /* CRC error flagged */
 597                         mac->netdev->stats.rx_errors++;
 598                         mac->netdev->stats.rx_crc_errors++;
 599                         /* No need to free skb, it'll be reused */
 600                         goto next;
 601                 }
 602
 603                 if (len < 256) {
 604                         struct sk_buff *new_skb;
 605
 606                         new_skb = netdev_alloc_skb(mac->netdev,
 607                                                    len + LOCAL_SKB_ALIGN);
 608                         if (new_skb) {
 609                                 skb_reserve(new_skb, LOCAL_SKB_ALIGN);
 610                                 memcpy(new_skb->data, skb->data, len);
 611                                 /* save the skb in buffer_info as good */
 612                                 skb = new_skb;
 613                         }
 614                         /* else just continue with the old one */
 615                 } else
 616                         info->skb = NULL;
 617
 618                 info->dma = 0;
 619
 620                 /* Don't include CRC */
 621                 skb_put(skb, len-4);
 622
 623                 if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
 624                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 625                         skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
 626                                            XCT_MACRX_CSUM_S;
 627                 } else
 628                         skb->ip_summed = CHECKSUM_NONE;
 629
 630                 mac->netdev->stats.rx_bytes += len;
 631                 mac->netdev->stats.rx_packets++;
 632
 633                 skb->protocol = eth_type_trans(skb, mac->netdev);
 634                 netif_receive_skb(skb);
 635
 636 next:
 637                 RX_DESC(rx, n) = 0;
 638                 RX_DESC(rx, n+1) = 0;
 639
 640                 /* Need to zero it out since hardware doesn't, since the
 641                  * replenish loop uses it to tell when it's done.
 642                  */
 643                 RX_BUFF(rx, buf_index) = 0;
 644
 645                 n += 4;
 646         }
 647
 648         if (n > RX_RING_SIZE) {
 649                 /* Errata 5971 workaround: L2 target of headers */
 650                 write_iob_reg(mac, PAS_IOB_COM_PKTHDRCNT, 0);
 651                 n &= (RX_RING_SIZE-1);
 652         }
 653
 654         rx_ring(mac)->next_to_clean = n;
 655
 656         /* Increase is in number of 16-byte entries, and since each descriptor
 657          * with an 8BRES takes up 3x8 bytes (padded to 4x8), increase with
 658          * count*2.
 659          */
 660         write_dma_reg(mac, PAS_DMA_RXCHAN_INCR(mac->dma_rxch), count << 1);
 661
 662         pasemi_mac_replenish_rx_ring(mac->netdev, count);
 663
 664         spin_unlock(&rx_ring(mac)->lock);
 665
 666         return count;
 667 }
 668
 669 /* Can't make this too large or we blow the kernel stack limits */
 670 #define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)
 671
 672 static int pasemi_mac_clean_tx(struct pasemi_mac_txring *txring)
 673 {
 674         struct pasemi_mac *mac = txring->mac;
 675         int i, j;
 676         unsigned int start, descr_count, buf_count, batch_limit;
 677         unsigned int ring_limit;
 678         unsigned int total_count;
 679         unsigned long flags;
 680         struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
 681         dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];
 682
 683         total_count = 0;
 684         batch_limit = TX_CLEAN_BATCHSIZE;
 685 restart:
 686         spin_lock_irqsave(&txring->lock, flags);
 687
 688         start = txring->next_to_clean;
 689         ring_limit = txring->next_to_fill;
 690
 691         /* Compensate for when fill has wrapped but clean has not */
 692         if (start > ring_limit)
 693                 ring_limit += TX_RING_SIZE;
 694
 695         buf_count = 0;
 696         descr_count = 0;
 697
 698         for (i = start;
 699              descr_count < batch_limit && i < ring_limit;
 700              i += buf_count) {
 701                 u64 mactx = TX_DESC(txring, i);
 702                 struct sk_buff *skb;
 703
 704                 if ((mactx  & XCT_MACTX_E) ||
 705                     (*tx_ring(mac)->status & PAS_STATUS_ERROR))
 706                         pasemi_mac_tx_error(mac, mactx);
 707
 708                 if (unlikely(mactx & XCT_MACTX_O))
 709                         /* Not yet transmitted */
 710                         break;
 711
 712                 skb = TX_DESC_INFO(txring, i+1).skb;
 713                 skbs[descr_count] = skb;
 714
 715                 buf_count = 2 + skb_shinfo(skb)->nr_frags;
 716                 for (j = 0; j <= skb_shinfo(skb)->nr_frags; j++)
 717                         dmas[descr_count][j] = TX_DESC_INFO(txring, i+1+j).dma;
 718
 719                 TX_DESC(txring, i) = 0;
 720                 TX_DESC(txring, i+1) = 0;
 721
 722                 /* Since we always fill with an even number of entries, make
 723                  * sure we skip any unused one at the end as well.
 724                  */
 725                 if (buf_count & 1)
 726                         buf_count++;
 727                 descr_count++;
 728         }
 729         txring->next_to_clean = i & (TX_RING_SIZE-1);
 730
 731         spin_unlock_irqrestore(&txring->lock, flags);
 732         netif_wake_queue(mac->netdev);
 733
 734         for (i = 0; i < descr_count; i++)
 735                 pasemi_mac_unmap_tx_skb(mac, skbs[i], dmas[i]);
 736
 737         total_count += descr_count;
 738
 739         /* If the batch was full, try to clean more */
 740         if (descr_count == batch_limit)
 741                 goto restart;
 742
 743         return total_count;
 744 }
 745
 746
 747 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 748 {
 749         struct net_device *dev = data;
 750         struct pasemi_mac *mac = netdev_priv(dev);
 751         unsigned int reg;
 752
 753         if (!(*rx_ring(mac)->status & PAS_STATUS_CAUSE_M))
 754                 return IRQ_NONE;
 755
 756         /* Don't reset packet count so it won't fire again but clear
 757          * all others.
 758          */
 759
 760         reg = 0;
 761         if (*rx_ring(mac)->status & PAS_STATUS_SOFT)
 762                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
 763         if (*rx_ring(mac)->status & PAS_STATUS_ERROR)
 764                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
 765         if (*rx_ring(mac)->status & PAS_STATUS_TIMER)
 766                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 767
 768         netif_rx_schedule(dev, &mac->napi);
 769
 770         write_iob_reg(mac, PAS_IOB_DMA_RXCH_RESET(mac->dma_rxch), reg);
 771
 772         return IRQ_HANDLED;
 773 }
 774
 775 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 776 {
 777         struct pasemi_mac_txring *txring = data;
 778         struct pasemi_mac *mac = txring->mac;
 779         unsigned int reg, pcnt;
 780
 781         if (!(*txring->status & PAS_STATUS_CAUSE_M))
 782                 return IRQ_NONE;
 783
 784         pasemi_mac_clean_tx(txring);
 785
 786         pcnt = *txring->status & PAS_STATUS_PCNT_M;
 787
 788         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
 789
 790         if (*txring->status & PAS_STATUS_SOFT)
 791                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
 792         if (*txring->status & PAS_STATUS_ERROR)
 793                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 794
 795         write_iob_reg(mac, PAS_IOB_DMA_TXCH_RESET(txring->chan), reg);
 796
 797         return IRQ_HANDLED;
 798 }
 799
 800 static void pasemi_adjust_link(struct net_device *dev)
 801 {
 802         struct pasemi_mac *mac = netdev_priv(dev);
 803         int msg;
 804         unsigned int flags;
 805         unsigned int new_flags;
 806
 807         if (!mac->phydev->link) {
 808                 /* If no link, MAC speed settings don't matter. Just report
 809                  * link down and return.
 810                  */
 811                 if (mac->link && netif_msg_link(mac))
 812                         printk(KERN_INFO "%s: Link is down.\n", dev->name);
 813
 814                 netif_carrier_off(dev);
 815                 mac->link = 0;
 816
 817                 return;
 818         } else
 819                 netif_carrier_on(dev);
 820
 821         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 822         new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
 823                               PAS_MAC_CFG_PCFG_TSR_M);
 824
 825         if (!mac->phydev->duplex)
 826                 new_flags |= PAS_MAC_CFG_PCFG_HD;
 827
 828         switch (mac->phydev->speed) {
 829         case 1000:
 830                 new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
 831                              PAS_MAC_CFG_PCFG_TSR_1G;
 832                 break;
 833         case 100:
 834                 new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
 835                              PAS_MAC_CFG_PCFG_TSR_100M;
 836                 break;
 837         case 10:
 838                 new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
 839                              PAS_MAC_CFG_PCFG_TSR_10M;
 840                 break;
 841         default:
 842                 printk("Unsupported speed %d\n", mac->phydev->speed);
 843         }
 844
 845         /* Print on link or speed/duplex change */
 846         msg = mac->link != mac->phydev->link || flags != new_flags;
 847
 848         mac->duplex = mac->phydev->duplex;
 849         mac->speed = mac->phydev->speed;
 850         mac->link = mac->phydev->link;
 851
 852         if (new_flags != flags)
 853                 write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
 854
 855         if (msg && netif_msg_link(mac))
 856                 printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
 857                        dev->name, mac->speed, mac->duplex ? "full" : "half");
 858 }
 859
 860 static int pasemi_mac_phy_init(struct net_device *dev)
 861 {
 862         struct pasemi_mac *mac = netdev_priv(dev);
 863         struct device_node *dn, *phy_dn;
 864         struct phy_device *phydev;
 865         unsigned int phy_id;
 866         const phandle *ph;
 867         const unsigned int *prop;
 868         struct resource r;
 869         int ret;
 870
 871         dn = pci_device_to_OF_node(mac->pdev);
 872         ph = of_get_property(dn, "phy-handle", NULL);
 873         if (!ph)
 874                 return -ENODEV;
 875         phy_dn = of_find_node_by_phandle(*ph);
 876
 877         prop = of_get_property(phy_dn, "reg", NULL);
 878         ret = of_address_to_resource(phy_dn->parent, 0, &r);
 879         if (ret)
 880                 goto err;
 881
 882         phy_id = *prop;
 883         snprintf(mac->phy_id, BUS_ID_SIZE, PHY_ID_FMT, (int)r.start, phy_id);
 884
 885         of_node_put(phy_dn);
 886
 887         mac->link = 0;
 888         mac->speed = 0;
 889         mac->duplex = -1;
 890
 891         phydev = phy_connect(dev, mac->phy_id, &pasemi_adjust_link, 0, PHY_INTERFACE_MODE_SGMII);
 892
 893         if (IS_ERR(phydev)) {
 894                 printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
 895                 return PTR_ERR(phydev);
 896         }
 897
 898         mac->phydev = phydev;
 899
 900         return 0;
 901
 902 err:
 903         of_node_put(phy_dn);
 904         return -ENODEV;
 905 }
 906
 907
 908 static int pasemi_mac_open(struct net_device *dev)
 909 {
 910         struct pasemi_mac *mac = netdev_priv(dev);
 911         int base_irq;
 912         unsigned int flags;
 913         int ret;
 914
 915         /* enable rx section */
 916         write_dma_reg(mac, PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
 917
 918         /* enable tx section */
 919         write_dma_reg(mac, PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
 920
 921         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
 922                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
 923                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
 924
 925         write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
 926
 927         write_iob_reg(mac, PAS_IOB_DMA_RXCH_CFG(mac->dma_rxch),
 928                            PAS_IOB_DMA_RXCH_CFG_CNTTH(0));
 929
 930         write_iob_reg(mac, PAS_IOB_DMA_TXCH_CFG(mac->dma_txch),
 931                            PAS_IOB_DMA_TXCH_CFG_CNTTH(128));
 932
 933         /* 0xffffff is max value, about 16ms */
 934         write_iob_reg(mac, PAS_IOB_DMA_COM_TIMEOUTCFG,
 935                            PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0xffffff));
 936
 937         ret = pasemi_mac_setup_rx_resources(dev);
 938         if (ret)
 939                 goto out_rx_resources;
 940
 941         mac->tx = pasemi_mac_setup_tx_resources(dev, mac->dma_txch);
 942
 943         if (!mac->tx)
 944                 goto out_tx_ring;
 945
 946         write_mac_reg(mac, PAS_MAC_IPC_CHNL,
 947                            PAS_MAC_IPC_CHNL_DCHNO(mac->dma_rxch) |
 948                            PAS_MAC_IPC_CHNL_BCH(mac->dma_rxch));
 949
 950         /* enable rx if */
 951         write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
 952                            PAS_DMA_RXINT_RCMDSTA_EN |
 953                            PAS_DMA_RXINT_RCMDSTA_DROPS_M |
 954                            PAS_DMA_RXINT_RCMDSTA_BP |
 955                            PAS_DMA_RXINT_RCMDSTA_OO |
 956                            PAS_DMA_RXINT_RCMDSTA_BT);
 957
 958         /* enable rx channel */
 959         write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
 960                            PAS_DMA_RXCHAN_CCMDSTA_EN |
 961                            PAS_DMA_RXCHAN_CCMDSTA_DU |
 962                            PAS_DMA_RXCHAN_CCMDSTA_OD |
 963                            PAS_DMA_RXCHAN_CCMDSTA_FD |
 964                            PAS_DMA_RXCHAN_CCMDSTA_DT);
 965
 966         /* enable tx channel */
 967         write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
 968                            PAS_DMA_TXCHAN_TCMDSTA_EN |
 969                            PAS_DMA_TXCHAN_TCMDSTA_SZ |
 970                            PAS_DMA_TXCHAN_TCMDSTA_DB |
 971                            PAS_DMA_TXCHAN_TCMDSTA_DE |
 972                            PAS_DMA_TXCHAN_TCMDSTA_DA);
 973
 974         pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
 975
 976         write_dma_reg(mac, PAS_DMA_RXCHAN_INCR(mac->dma_rxch), RX_RING_SIZE>>1);
 977
 978         /* Clear out any residual packet count state from firmware */
 979         pasemi_mac_restart_rx_intr(mac);
 980         pasemi_mac_restart_tx_intr(mac);
 981
 982         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PE |
 983                 PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
 984
 985         if (mac->type == MAC_TYPE_GMAC)
 986                 flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
 987         else
 988                 flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
 989
 990         /* Enable interface in MAC */
 991         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
 992
 993         ret = pasemi_mac_phy_init(dev);
 994         /* Some configs don't have PHYs (XAUI etc), so don't complain about
 995          * failed init due to -ENODEV.
 996          */
 997         if (ret && ret != -ENODEV)
 998                 dev_warn(&mac->pdev->dev, "phy init failed: %d\n", ret);
 999
1000         netif_start_queue(dev);
1001         napi_enable(&mac->napi);
1002
1003         /* Interrupts are a bit different for our DMA controller: While
1004          * it's got one a regular PCI device header, the interrupt there
1005          * is really the base of the range it's using. Each tx and rx
1006          * channel has it's own interrupt source.
1007          */
1008
1009         base_irq = virq_to_hw(mac->dma_pdev->irq);
1010
1011         mac->tx_irq = irq_create_mapping(NULL, base_irq + mac->dma_txch);
1012
1013         snprintf(mac->tx_irq_name, sizeof(mac->tx_irq_name), "%s tx",
1014                  dev->name);
1015
1016         ret = request_irq(mac->tx_irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
1017                           mac->tx_irq_name, mac->tx);
1018         if (ret) {
1019                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1020                         base_irq + mac->dma_txch, ret);
1021                 goto out_tx_int;
1022         }
1023
1024         mac->rx_irq = irq_create_mapping(NULL, base_irq + 20 + mac->dma_rxch);
1025
1026         snprintf(mac->rx_irq_name, sizeof(mac->rx_irq_name), "%s rx",
1027                  dev->name);
1028
1029         ret = request_irq(mac->rx_irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
1030                           mac->rx_irq_name, dev);
1031         if (ret) {
1032                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1033                         base_irq + 20 + mac->dma_rxch, ret);
1034                 goto out_rx_int;
1035         }
1036
1037         if (mac->phydev)
1038                 phy_start(mac->phydev);
1039
1040         return 0;
1041
1042 out_rx_int:
1043         free_irq(mac->tx_irq, mac->tx);
1044 out_tx_int:
1045         napi_disable(&mac->napi);
1046         netif_stop_queue(dev);
1047 out_tx_ring:
1048         if (mac->tx)
1049                 pasemi_mac_free_tx_resources(mac);
1050         pasemi_mac_free_rx_resources(mac);
1051 out_rx_resources:
1052
1053         return ret;
1054 }
1055
1056 #define MAX_RETRIES 5000
1057
1058 static int pasemi_mac_close(struct net_device *dev)
1059 {
1060         struct pasemi_mac *mac = netdev_priv(dev);
1061         unsigned int sta;
1062         int retries;
1063
1064         if (mac->phydev) {
1065                 phy_stop(mac->phydev);
1066                 phy_disconnect(mac->phydev);
1067         }
1068
1069         netif_stop_queue(dev);
1070         napi_disable(&mac->napi);
1071
1072         sta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1073         if (sta & (PAS_DMA_RXINT_RCMDSTA_BP |
1074                       PAS_DMA_RXINT_RCMDSTA_OO |
1075                       PAS_DMA_RXINT_RCMDSTA_BT))
1076                 printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta);
1077
1078         sta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
1079         if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU |
1080                      PAS_DMA_RXCHAN_CCMDSTA_OD |
1081                      PAS_DMA_RXCHAN_CCMDSTA_FD |
1082                      PAS_DMA_RXCHAN_CCMDSTA_DT))
1083                 printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta);
1084
1085         sta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
1086         if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ | PAS_DMA_TXCHAN_TCMDSTA_DB |
1087                       PAS_DMA_TXCHAN_TCMDSTA_DE | PAS_DMA_TXCHAN_TCMDSTA_DA))
1088                 printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta);
1089
1090         /* Clean out any pending buffers */
1091         pasemi_mac_clean_tx(tx_ring(mac));
1092         pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
1093
1094         /* Disable interface */
1095         write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch),
1096                       PAS_DMA_TXCHAN_TCMDSTA_ST);
1097         write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1098                       PAS_DMA_RXINT_RCMDSTA_ST);
1099         write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch),
1100                       PAS_DMA_RXCHAN_CCMDSTA_ST);
1101
1102         for (retries = 0; retries < MAX_RETRIES; retries++) {
1103                 sta = read_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch));
1104                 if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT))
1105                         break;
1106                 cond_resched();
1107         }
1108
1109         if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)
1110                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel %d\n",
1111                         mac->dma_txch);
1112
1113         for (retries = 0; retries < MAX_RETRIES; retries++) {
1114                 sta = read_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch));
1115                 if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT))
1116                         break;
1117                 cond_resched();
1118         }
1119
1120         if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)
1121                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
1122
1123         for (retries = 0; retries < MAX_RETRIES; retries++) {
1124                 sta = read_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1125                 if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT))
1126                         break;
1127                 cond_resched();
1128         }
1129
1130         if (sta & PAS_DMA_RXINT_RCMDSTA_ACT)
1131                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
1132
1133         /* Then, disable the channel. This must be done separately from
1134          * stopping, since you can't disable when active.
1135          */
1136
1137         write_dma_reg(mac, PAS_DMA_TXCHAN_TCMDSTA(mac->dma_txch), 0);
1138         write_dma_reg(mac, PAS_DMA_RXCHAN_CCMDSTA(mac->dma_rxch), 0);
1139         write_dma_reg(mac, PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
1140
1141         free_irq(mac->tx_irq, mac->tx);
1142         free_irq(mac->rx_irq, mac->rx);
1143
1144         /* Free resources */
1145         pasemi_mac_free_rx_resources(mac);
1146         pasemi_mac_free_tx_resources(mac);
1147
1148         return 0;
1149 }
1150
1151 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
1152 {
1153         struct pasemi_mac *mac = netdev_priv(dev);
1154         struct pasemi_mac_txring *txring;
1155         u64 dflags, mactx;
1156         dma_addr_t map[MAX_SKB_FRAGS+1];
1157         unsigned int map_size[MAX_SKB_FRAGS+1];
1158         unsigned long flags;
1159         int i, nfrags;
1160
1161         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;
1162
1163         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1164                 const unsigned char *nh = skb_network_header(skb);
1165
1166                 switch (ip_hdr(skb)->protocol) {
1167                 case IPPROTO_TCP:
1168                         dflags |= XCT_MACTX_CSUM_TCP;
1169                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1170                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1171                         break;
1172                 case IPPROTO_UDP:
1173                         dflags |= XCT_MACTX_CSUM_UDP;
1174                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1175                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1176                         break;
1177                 }
1178         }
1179
1180         nfrags = skb_shinfo(skb)->nr_frags;
1181
1182         map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb),
1183                                 PCI_DMA_TODEVICE);
1184         map_size[0] = skb_headlen(skb);
1185         if (dma_mapping_error(map[0]))
1186                 goto out_err_nolock;
1187
1188         for (i = 0; i < nfrags; i++) {
1189                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1190
1191                 map[i+1] = pci_map_page(mac->dma_pdev, frag->page,
1192                                         frag->page_offset, frag->size,
1193                                         PCI_DMA_TODEVICE);
1194                 map_size[i+1] = frag->size;
1195                 if (dma_mapping_error(map[i+1])) {
1196                         nfrags = i;
1197                         goto out_err_nolock;
1198                 }
1199         }
1200
1201         mactx = dflags | XCT_MACTX_LLEN(skb->len);
1202
1203         txring = tx_ring(mac);
1204
1205         spin_lock_irqsave(&txring->lock, flags);
1206
1207         /* Avoid stepping on the same cache line that the DMA controller
1208          * is currently about to send, so leave at least 8 words available.
1209          * Total free space needed is mactx + fragments + 8
1210          */
1211         if (RING_AVAIL(txring) < nfrags + 10) {
1212                 /* no room -- stop the queue and wait for tx intr */
1213                 netif_stop_queue(dev);
1214                 goto out_err;
1215         }
1216
1217         TX_DESC(txring, txring->next_to_fill) = mactx;
1218         txring->next_to_fill++;
1219         TX_DESC_INFO(txring, txring->next_to_fill).skb = skb;
1220         for (i = 0; i <= nfrags; i++) {
1221                 TX_DESC(txring, txring->next_to_fill+i) =
1222                         XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1223                 TX_DESC_INFO(txring, txring->next_to_fill+i).dma = map[i];
1224         }
1225
1226         /* We have to add an even number of 8-byte entries to the ring
1227          * even if the last one is unused. That means always an odd number
1228          * of pointers + one mactx descriptor.
1229          */
1230         if (nfrags & 1)
1231                 nfrags++;
1232
1233         txring->next_to_fill = (txring->next_to_fill + nfrags + 1) &
1234                                 (TX_RING_SIZE-1);
1235
1236         dev->stats.tx_packets++;
1237         dev->stats.tx_bytes += skb->len;
1238
1239         spin_unlock_irqrestore(&txring->lock, flags);
1240
1241         write_dma_reg(mac, PAS_DMA_TXCHAN_INCR(txring->chan), (nfrags+2) >> 1);
1242
1243         return NETDEV_TX_OK;
1244
1245 out_err:
1246         spin_unlock_irqrestore(&txring->lock, flags);
1247 out_err_nolock:
1248         while (nfrags--)
1249                 pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags],
1250                                  PCI_DMA_TODEVICE);
1251
1252         return NETDEV_TX_BUSY;
1253 }
1254
1255 static void pasemi_mac_set_rx_mode(struct net_device *dev)
1256 {
1257         struct pasemi_mac *mac = netdev_priv(dev);
1258         unsigned int flags;
1259
1260         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1261
1262         /* Set promiscuous */
1263         if (dev->flags & IFF_PROMISC)
1264                 flags |= PAS_MAC_CFG_PCFG_PR;
1265         else
1266                 flags &= ~PAS_MAC_CFG_PCFG_PR;
1267
1268         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1269 }
1270
1271
1272 static int pasemi_mac_poll(struct napi_struct *napi, int budget)
1273 {
1274         struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
1275         struct net_device *dev = mac->netdev;
1276         int pkts;
1277
1278         pasemi_mac_clean_tx(tx_ring(mac));
1279         pkts = pasemi_mac_clean_rx(rx_ring(mac), budget);
1280         if (pkts < budget) {
1281                 /* all done, no more packets present */
1282                 netif_rx_complete(dev, napi);
1283
1284                 pasemi_mac_restart_rx_intr(mac);
1285         }
1286         return pkts;
1287 }
1288
1289 static void __iomem * __devinit map_onedev(struct pci_dev *p, int index)
1290 {
1291         struct device_node *dn;
1292         void __iomem *ret;
1293
1294         dn = pci_device_to_OF_node(p);
1295         if (!dn)
1296                 goto fallback;
1297
1298         ret = of_iomap(dn, index);
1299         if (!ret)
1300                 goto fallback;
1301
1302         return ret;
1303 fallback:
1304         /* This is hardcoded and ugly, but we have some firmware versions
1305          * that don't provide the register space in the device tree. Luckily
1306          * they are at well-known locations so we can just do the math here.
1307          */
1308         return ioremap(0xe0000000 + (p->devfn << 12), 0x2000);
1309 }
1310
1311 static int __devinit pasemi_mac_map_regs(struct pasemi_mac *mac)
1312 {
1313         struct resource res;
1314         struct device_node *dn;
1315         int err;
1316
1317         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
1318         if (!mac->dma_pdev) {
1319                 dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
1320                 return -ENODEV;
1321         }
1322
1323         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
1324         if (!mac->iob_pdev) {
1325                 dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
1326                 return -ENODEV;
1327         }
1328
1329         mac->regs = map_onedev(mac->pdev, 0);
1330         mac->dma_regs = map_onedev(mac->dma_pdev, 0);
1331         mac->iob_regs = map_onedev(mac->iob_pdev, 0);
1332
1333         if (!mac->regs || !mac->dma_regs || !mac->iob_regs) {
1334                 dev_err(&mac->pdev->dev, "Can't map registers\n");
1335                 return -ENODEV;
1336         }
1337
1338         /* The dma status structure is located in the I/O bridge, and
1339          * is cache coherent.
1340          */
1341         if (!dma_status) {
1342                 dn = pci_device_to_OF_node(mac->iob_pdev);
1343                 if (dn)
1344                         err = of_address_to_resource(dn, 1, &res);
1345                 if (!dn || err) {
1346                         /* Fallback for old firmware */
1347                         res.start = 0xfd800000;
1348                         res.end = res.start + 0x1000;
1349                 }
1350                 dma_status = __ioremap(res.start, res.end-res.start, 0);
1351         }
1352
1353         return 0;
1354 }
1355
1356 static int __devinit
1357 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1358 {
1359         static int index = 0;
1360         struct net_device *dev;
1361         struct pasemi_mac *mac;
1362         int err;
1363         DECLARE_MAC_BUF(mac_buf);
1364
1365         err = pci_enable_device(pdev);
1366         if (err)
1367                 return err;
1368
1369         dev = alloc_etherdev(sizeof(struct pasemi_mac));
1370         if (dev == NULL) {
1371                 dev_err(&pdev->dev,
1372                         "pasemi_mac: Could not allocate ethernet device.\n");
1373                 err = -ENOMEM;
1374                 goto out_disable_device;
1375         }
1376
1377         pci_set_drvdata(pdev, dev);
1378         SET_NETDEV_DEV(dev, &pdev->dev);
1379
1380         mac = netdev_priv(dev);
1381
1382         mac->pdev = pdev;
1383         mac->netdev = dev;
1384
1385         netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
1386
1387         dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG;
1388
1389         /* These should come out of the device tree eventually */
1390         mac->dma_txch = index;
1391         mac->dma_rxch = index;
1392
1393         /* We probe GMAC before XAUI, but the DMA interfaces are
1394          * in XAUI, GMAC order.
1395          */
1396         if (index < 4)
1397                 mac->dma_if = index + 2;
1398         else
1399                 mac->dma_if = index - 4;
1400         index++;
1401
1402         switch (pdev->device) {
1403         case 0xa005:
1404                 mac->type = MAC_TYPE_GMAC;
1405                 break;
1406         case 0xa006:
1407                 mac->type = MAC_TYPE_XAUI;
1408                 break;
1409         default:
1410                 err = -ENODEV;
1411                 goto out;
1412         }
1413
1414         /* get mac addr from device tree */
1415         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1416                 err = -ENODEV;
1417                 goto out;
1418         }
1419         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
1420
1421         dev->open = pasemi_mac_open;
1422         dev->stop = pasemi_mac_close;
1423         dev->hard_start_xmit = pasemi_mac_start_tx;
1424         dev->set_multicast_list = pasemi_mac_set_rx_mode;
1425
1426         err = pasemi_mac_map_regs(mac);
1427         if (err)
1428                 goto out;
1429
1430         mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1431
1432         /* Enable most messages by default */
1433         mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
1434
1435         err = register_netdev(dev);
1436
1437         if (err) {
1438                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1439                         err);
1440                 goto out;
1441         } else if netif_msg_probe(mac)
1442                 printk(KERN_INFO "%s: PA Semi %s: intf %d, hw addr %s\n",
1443                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1444                        mac->dma_if, print_mac(mac_buf, dev->dev_addr));
1445
1446         return err;
1447
1448 out:
1449         if (mac->iob_pdev)
1450                 pci_dev_put(mac->iob_pdev);
1451         if (mac->dma_pdev)
1452                 pci_dev_put(mac->dma_pdev);
1453         if (mac->dma_regs)
1454                 iounmap(mac->dma_regs);
1455         if (mac->iob_regs)
1456                 iounmap(mac->iob_regs);
1457         if (mac->regs)
1458                 iounmap(mac->regs);
1459
1460         free_netdev(dev);
1461 out_disable_device:
1462         pci_disable_device(pdev);
1463         return err;
1464
1465 }
1466
1467 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1468 {
1469         struct net_device *netdev = pci_get_drvdata(pdev);
1470         struct pasemi_mac *mac;
1471
1472         if (!netdev)
1473                 return;
1474
1475         mac = netdev_priv(netdev);
1476
1477         unregister_netdev(netdev);
1478
1479         pci_disable_device(pdev);
1480         pci_dev_put(mac->dma_pdev);
1481         pci_dev_put(mac->iob_pdev);
1482
1483         iounmap(mac->regs);
1484         iounmap(mac->dma_regs);
1485         iounmap(mac->iob_regs);
1486
1487         pci_set_drvdata(pdev, NULL);
1488         free_netdev(netdev);
1489 }
1490
1491 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1492         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1493         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1494         { },
1495 };
1496
1497 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1498
1499 static struct pci_driver pasemi_mac_driver = {
1500         .name           = "pasemi_mac",
1501         .id_table       = pasemi_mac_pci_tbl,
1502         .probe          = pasemi_mac_probe,
1503         .remove         = __devexit_p(pasemi_mac_remove),
1504 };
1505
1506 static void __exit pasemi_mac_cleanup_module(void)
1507 {
1508         pci_unregister_driver(&pasemi_mac_driver);
1509         __iounmap(dma_status);
1510         dma_status = NULL;
1511 }
1512
1513 int pasemi_mac_init_module(void)
1514 {
1515         return pci_register_driver(&pasemi_mac_driver);
1516 }
1517
1518 module_init(pasemi_mac_init_module);
1519 module_exit(pasemi_mac_cleanup_module);