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