drivers/net/ethernet/pasemi/pasemi_mac.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2006-2007 PA Semi, Inc
   4  *
   5  * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/pci.h>
  10 #include <linux/slab.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/dmaengine.h>
  13 #include <linux/delay.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/of_mdio.h>
  16 #include <linux/etherdevice.h>
  17 #include <asm/dma-mapping.h>
  18 #include <linux/in.h>
  19 #include <linux/skbuff.h>
  20
  21 #include <linux/ip.h>
  22 #include <net/checksum.h>
  23 #include <linux/prefetch.h>
  24
  25 #include <asm/irq.h>
  26 #include <asm/firmware.h>
  27 #include <asm/pasemi_dma.h>
  28
  29 #include "pasemi_mac.h"
  30
  31 /* We have our own align, since ppc64 in general has it at 0 because
  32  * of design flaws in some of the server bridge chips. However, for
  33  * PWRficient doing the unaligned copies is more expensive than doing
  34  * unaligned DMA, so make sure the data is aligned instead.
  35  */
  36 #define LOCAL_SKB_ALIGN 2
  37
  38 /* TODO list
  39  *
  40  * - Multicast support
  41  * - Large MTU support
  42  * - Multiqueue RX/TX
  43  */
  44
  45 #define PE_MIN_MTU      (ETH_ZLEN + ETH_HLEN)
  46 #define PE_MAX_MTU      9000
  47 #define PE_DEF_MTU      ETH_DATA_LEN
  48
  49 #define DEFAULT_MSG_ENABLE        \
  50         (NETIF_MSG_DRV          | \
  51          NETIF_MSG_PROBE        | \
  52          NETIF_MSG_LINK         | \
  53          NETIF_MSG_TIMER        | \
  54          NETIF_MSG_IFDOWN       | \
  55          NETIF_MSG_IFUP         | \
  56          NETIF_MSG_RX_ERR       | \
  57          NETIF_MSG_TX_ERR)
  58
  59 MODULE_LICENSE("GPL");
  60 MODULE_AUTHOR ("Olof Johansson <[email protected]>");
  61 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
  62
  63 static int debug = -1;  /* -1 == use DEFAULT_MSG_ENABLE as value */
  64 module_param(debug, int, 0);
  65 MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
  66
  67 extern const struct ethtool_ops pasemi_mac_ethtool_ops;
  68
  69 static int translation_enabled(void)
  70 {
  71 #if defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE)
  72         return 1;
  73 #else
  74         return firmware_has_feature(FW_FEATURE_LPAR);
  75 #endif
  76 }
  77
  78 static void write_iob_reg(unsigned int reg, unsigned int val)
  79 {
  80         pasemi_write_iob_reg(reg, val);
  81 }
  82
  83 static unsigned int read_mac_reg(const struct pasemi_mac *mac, unsigned int reg)
  84 {
  85         return pasemi_read_mac_reg(mac->dma_if, reg);
  86 }
  87
  88 static void write_mac_reg(const struct pasemi_mac *mac, unsigned int reg,
  89                           unsigned int val)
  90 {
  91         pasemi_write_mac_reg(mac->dma_if, reg, val);
  92 }
  93
  94 static unsigned int read_dma_reg(unsigned int reg)
  95 {
  96         return pasemi_read_dma_reg(reg);
  97 }
  98
  99 static void write_dma_reg(unsigned int reg, unsigned int val)
 100 {
 101         pasemi_write_dma_reg(reg, val);
 102 }
 103
 104 static struct pasemi_mac_rxring *rx_ring(const struct pasemi_mac *mac)
 105 {
 106         return mac->rx;
 107 }
 108
 109 static struct pasemi_mac_txring *tx_ring(const struct pasemi_mac *mac)
 110 {
 111         return mac->tx;
 112 }
 113
 114 static inline void prefetch_skb(const struct sk_buff *skb)
 115 {
 116         const void *d = skb;
 117
 118         prefetch(d);
 119         prefetch(d+64);
 120         prefetch(d+128);
 121         prefetch(d+192);
 122 }
 123
 124 static int mac_to_intf(struct pasemi_mac *mac)
 125 {
 126         struct pci_dev *pdev = mac->pdev;
 127         u32 tmp;
 128         int nintf, off, i, j;
 129         int devfn = pdev->devfn;
 130
 131         tmp = read_dma_reg(PAS_DMA_CAP_IFI);
 132         nintf = (tmp & PAS_DMA_CAP_IFI_NIN_M) >> PAS_DMA_CAP_IFI_NIN_S;
 133         off = (tmp & PAS_DMA_CAP_IFI_IOFF_M) >> PAS_DMA_CAP_IFI_IOFF_S;
 134
 135         /* IOFF contains the offset to the registers containing the
 136          * DMA interface-to-MAC-pci-id mappings, and NIN contains number
 137          * of total interfaces. Each register contains 4 devfns.
 138          * Just do a linear search until we find the devfn of the MAC
 139          * we're trying to look up.
 140          */
 141
 142         for (i = 0; i < (nintf+3)/4; i++) {
 143                 tmp = read_dma_reg(off+4*i);
 144                 for (j = 0; j < 4; j++) {
 145                         if (((tmp >> (8*j)) & 0xff) == devfn)
 146                                 return i*4 + j;
 147                 }
 148         }
 149         return -1;
 150 }
 151
 152 static void pasemi_mac_intf_disable(struct pasemi_mac *mac)
 153 {
 154         unsigned int flags;
 155
 156         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 157         flags &= ~PAS_MAC_CFG_PCFG_PE;
 158         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
 159 }
 160
 161 static void pasemi_mac_intf_enable(struct pasemi_mac *mac)
 162 {
 163         unsigned int flags;
 164
 165         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 166         flags |= PAS_MAC_CFG_PCFG_PE;
 167         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
 168 }
 169
 170 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
 171 {
 172         struct pci_dev *pdev = mac->pdev;
 173         struct device_node *dn = pci_device_to_OF_node(pdev);
 174         int len;
 175         const u8 *maddr;
 176         u8 addr[ETH_ALEN];
 177
 178         if (!dn) {
 179                 dev_dbg(&pdev->dev,
 180                           "No device node for mac, not configuring\n");
 181                 return -ENOENT;
 182         }
 183
 184         maddr = of_get_property(dn, "local-mac-address", &len);
 185
 186         if (maddr && len == ETH_ALEN) {
 187                 memcpy(mac->mac_addr, maddr, ETH_ALEN);
 188                 return 0;
 189         }
 190
 191         /* Some old versions of firmware mistakenly uses mac-address
 192          * (and as a string) instead of a byte array in local-mac-address.
 193          */
 194
 195         if (maddr == NULL)
 196                 maddr = of_get_property(dn, "mac-address", NULL);
 197
 198         if (maddr == NULL) {
 199                 dev_warn(&pdev->dev,
 200                          "no mac address in device tree, not configuring\n");
 201                 return -ENOENT;
 202         }
 203
 204         if (!mac_pton(maddr, addr)) {
 205                 dev_warn(&pdev->dev,
 206                          "can't parse mac address, not configuring\n");
 207                 return -EINVAL;
 208         }
 209
 210         memcpy(mac->mac_addr, addr, ETH_ALEN);
 211
 212         return 0;
 213 }
 214
 215 static int pasemi_mac_set_mac_addr(struct net_device *dev, void *p)
 216 {
 217         struct pasemi_mac *mac = netdev_priv(dev);
 218         struct sockaddr *addr = p;
 219         unsigned int adr0, adr1;
 220
 221         if (!is_valid_ether_addr(addr->sa_data))
 222                 return -EADDRNOTAVAIL;
 223
 224         eth_hw_addr_set(dev, addr->sa_data);
 225
 226         adr0 = dev->dev_addr[2] << 24 |
 227                dev->dev_addr[3] << 16 |
 228                dev->dev_addr[4] << 8 |
 229                dev->dev_addr[5];
 230         adr1 = read_mac_reg(mac, PAS_MAC_CFG_ADR1);
 231         adr1 &= ~0xffff;
 232         adr1 |= dev->dev_addr[0] << 8 | dev->dev_addr[1];
 233
 234         pasemi_mac_intf_disable(mac);
 235         write_mac_reg(mac, PAS_MAC_CFG_ADR0, adr0);
 236         write_mac_reg(mac, PAS_MAC_CFG_ADR1, adr1);
 237         pasemi_mac_intf_enable(mac);
 238
 239         return 0;
 240 }
 241
 242 static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
 243                                     const int nfrags,
 244                                     struct sk_buff *skb,
 245                                     const dma_addr_t *dmas)
 246 {
 247         int f;
 248         struct pci_dev *pdev = mac->dma_pdev;
 249
 250         dma_unmap_single(&pdev->dev, dmas[0], skb_headlen(skb), DMA_TO_DEVICE);
 251
 252         for (f = 0; f < nfrags; f++) {
 253                 const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
 254
 255                 dma_unmap_page(&pdev->dev, dmas[f + 1], skb_frag_size(frag),
 256                                DMA_TO_DEVICE);
 257         }
 258         dev_kfree_skb_irq(skb);
 259
 260         /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
 261          * aligned up to a power of 2
 262          */
 263         return (nfrags + 3) & ~1;
 264 }
 265
 266 static struct pasemi_mac_csring *pasemi_mac_setup_csring(struct pasemi_mac *mac)
 267 {
 268         struct pasemi_mac_csring *ring;
 269         u32 val;
 270         unsigned int cfg;
 271         int chno;
 272
 273         ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_csring),
 274                                        offsetof(struct pasemi_mac_csring, chan));
 275
 276         if (!ring) {
 277                 dev_err(&mac->pdev->dev, "Can't allocate checksum channel\n");
 278                 goto out_chan;
 279         }
 280
 281         chno = ring->chan.chno;
 282
 283         ring->size = CS_RING_SIZE;
 284         ring->next_to_fill = 0;
 285
 286         /* Allocate descriptors */
 287         if (pasemi_dma_alloc_ring(&ring->chan, CS_RING_SIZE))
 288                 goto out_ring_desc;
 289
 290         write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
 291                       PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
 292         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
 293         val |= PAS_DMA_TXCHAN_BASEU_SIZ(CS_RING_SIZE >> 3);
 294
 295         write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val);
 296
 297         ring->events[0] = pasemi_dma_alloc_flag();
 298         ring->events[1] = pasemi_dma_alloc_flag();
 299         if (ring->events[0] < 0 || ring->events[1] < 0)
 300                 goto out_flags;
 301
 302         pasemi_dma_clear_flag(ring->events[0]);
 303         pasemi_dma_clear_flag(ring->events[1]);
 304
 305         ring->fun = pasemi_dma_alloc_fun();
 306         if (ring->fun < 0)
 307                 goto out_fun;
 308
 309         cfg = PAS_DMA_TXCHAN_CFG_TY_FUNC | PAS_DMA_TXCHAN_CFG_UP |
 310               PAS_DMA_TXCHAN_CFG_TATTR(ring->fun) |
 311               PAS_DMA_TXCHAN_CFG_LPSQ | PAS_DMA_TXCHAN_CFG_LPDQ;
 312
 313         if (translation_enabled())
 314                 cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
 315
 316         write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
 317
 318         /* enable channel */
 319         pasemi_dma_start_chan(&ring->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ |
 320                                            PAS_DMA_TXCHAN_TCMDSTA_DB |
 321                                            PAS_DMA_TXCHAN_TCMDSTA_DE |
 322                                            PAS_DMA_TXCHAN_TCMDSTA_DA);
 323
 324         return ring;
 325
 326 out_fun:
 327 out_flags:
 328         if (ring->events[0] >= 0)
 329                 pasemi_dma_free_flag(ring->events[0]);
 330         if (ring->events[1] >= 0)
 331                 pasemi_dma_free_flag(ring->events[1]);
 332         pasemi_dma_free_ring(&ring->chan);
 333 out_ring_desc:
 334         pasemi_dma_free_chan(&ring->chan);
 335 out_chan:
 336
 337         return NULL;
 338 }
 339
 340 static void pasemi_mac_setup_csrings(struct pasemi_mac *mac)
 341 {
 342         int i;
 343         mac->cs[0] = pasemi_mac_setup_csring(mac);
 344         if (mac->type == MAC_TYPE_XAUI)
 345                 mac->cs[1] = pasemi_mac_setup_csring(mac);
 346         else
 347                 mac->cs[1] = 0;
 348
 349         for (i = 0; i < MAX_CS; i++)
 350                 if (mac->cs[i])
 351                         mac->num_cs++;
 352 }
 353
 354 static void pasemi_mac_free_csring(struct pasemi_mac_csring *csring)
 355 {
 356         pasemi_dma_stop_chan(&csring->chan);
 357         pasemi_dma_free_flag(csring->events[0]);
 358         pasemi_dma_free_flag(csring->events[1]);
 359         pasemi_dma_free_ring(&csring->chan);
 360         pasemi_dma_free_chan(&csring->chan);
 361         pasemi_dma_free_fun(csring->fun);
 362 }
 363
 364 static int pasemi_mac_setup_rx_resources(const struct net_device *dev)
 365 {
 366         struct pasemi_mac_rxring *ring;
 367         struct pasemi_mac *mac = netdev_priv(dev);
 368         int chno;
 369         unsigned int cfg;
 370
 371         ring = pasemi_dma_alloc_chan(RXCHAN, sizeof(struct pasemi_mac_rxring),
 372                                      offsetof(struct pasemi_mac_rxring, chan));
 373
 374         if (!ring) {
 375                 dev_err(&mac->pdev->dev, "Can't allocate RX channel\n");
 376                 goto out_chan;
 377         }
 378         chno = ring->chan.chno;
 379
 380         spin_lock_init(&ring->lock);
 381
 382         ring->size = RX_RING_SIZE;
 383         ring->ring_info = kcalloc(RX_RING_SIZE,
 384                                   sizeof(struct pasemi_mac_buffer),
 385                                   GFP_KERNEL);
 386
 387         if (!ring->ring_info)
 388                 goto out_ring_info;
 389
 390         /* Allocate descriptors */
 391         if (pasemi_dma_alloc_ring(&ring->chan, RX_RING_SIZE))
 392                 goto out_ring_desc;
 393
 394         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
 395                                            RX_RING_SIZE * sizeof(u64),
 396                                            &ring->buf_dma, GFP_KERNEL);
 397         if (!ring->buffers)
 398                 goto out_ring_desc;
 399
 400         write_dma_reg(PAS_DMA_RXCHAN_BASEL(chno),
 401                       PAS_DMA_RXCHAN_BASEL_BRBL(ring->chan.ring_dma));
 402
 403         write_dma_reg(PAS_DMA_RXCHAN_BASEU(chno),
 404                       PAS_DMA_RXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32) |
 405                       PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
 406
 407         cfg = PAS_DMA_RXCHAN_CFG_HBU(2);
 408
 409         if (translation_enabled())
 410                 cfg |= PAS_DMA_RXCHAN_CFG_CTR;
 411
 412         write_dma_reg(PAS_DMA_RXCHAN_CFG(chno), cfg);
 413
 414         write_dma_reg(PAS_DMA_RXINT_BASEL(mac->dma_if),
 415                       PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma));
 416
 417         write_dma_reg(PAS_DMA_RXINT_BASEU(mac->dma_if),
 418                       PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) |
 419                       PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
 420
 421         cfg = PAS_DMA_RXINT_CFG_DHL(2) | PAS_DMA_RXINT_CFG_L2 |
 422               PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP |
 423               PAS_DMA_RXINT_CFG_HEN;
 424
 425         if (translation_enabled())
 426                 cfg |= PAS_DMA_RXINT_CFG_ITRR | PAS_DMA_RXINT_CFG_ITR;
 427
 428         write_dma_reg(PAS_DMA_RXINT_CFG(mac->dma_if), cfg);
 429
 430         ring->next_to_fill = 0;
 431         ring->next_to_clean = 0;
 432         ring->mac = mac;
 433         mac->rx = ring;
 434
 435         return 0;
 436
 437 out_ring_desc:
 438         kfree(ring->ring_info);
 439 out_ring_info:
 440         pasemi_dma_free_chan(&ring->chan);
 441 out_chan:
 442         return -ENOMEM;
 443 }
 444
 445 static struct pasemi_mac_txring *
 446 pasemi_mac_setup_tx_resources(const struct net_device *dev)
 447 {
 448         struct pasemi_mac *mac = netdev_priv(dev);
 449         u32 val;
 450         struct pasemi_mac_txring *ring;
 451         unsigned int cfg;
 452         int chno;
 453
 454         ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_txring),
 455                                      offsetof(struct pasemi_mac_txring, chan));
 456
 457         if (!ring) {
 458                 dev_err(&mac->pdev->dev, "Can't allocate TX channel\n");
 459                 goto out_chan;
 460         }
 461
 462         chno = ring->chan.chno;
 463
 464         spin_lock_init(&ring->lock);
 465
 466         ring->size = TX_RING_SIZE;
 467         ring->ring_info = kcalloc(TX_RING_SIZE,
 468                                   sizeof(struct pasemi_mac_buffer),
 469                                   GFP_KERNEL);
 470         if (!ring->ring_info)
 471                 goto out_ring_info;
 472
 473         /* Allocate descriptors */
 474         if (pasemi_dma_alloc_ring(&ring->chan, TX_RING_SIZE))
 475                 goto out_ring_desc;
 476
 477         write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
 478                       PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
 479         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
 480         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
 481
 482         write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val);
 483
 484         cfg = PAS_DMA_TXCHAN_CFG_TY_IFACE |
 485               PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
 486               PAS_DMA_TXCHAN_CFG_UP |
 487               PAS_DMA_TXCHAN_CFG_WT(4);
 488
 489         if (translation_enabled())
 490                 cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
 491
 492         write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
 493
 494         ring->next_to_fill = 0;
 495         ring->next_to_clean = 0;
 496         ring->mac = mac;
 497
 498         return ring;
 499
 500 out_ring_desc:
 501         kfree(ring->ring_info);
 502 out_ring_info:
 503         pasemi_dma_free_chan(&ring->chan);
 504 out_chan:
 505         return NULL;
 506 }
 507
 508 static void pasemi_mac_free_tx_resources(struct pasemi_mac *mac)
 509 {
 510         struct pasemi_mac_txring *txring = tx_ring(mac);
 511         unsigned int i, j;
 512         struct pasemi_mac_buffer *info;
 513         dma_addr_t dmas[MAX_SKB_FRAGS+1];
 514         int freed, nfrags;
 515         int start, limit;
 516
 517         start = txring->next_to_clean;
 518         limit = txring->next_to_fill;
 519
 520         /* Compensate for when fill has wrapped and clean has not */
 521         if (start > limit)
 522                 limit += TX_RING_SIZE;
 523
 524         for (i = start; i < limit; i += freed) {
 525                 info = &txring->ring_info[(i+1) & (TX_RING_SIZE-1)];
 526                 if (info->dma && info->skb) {
 527                         nfrags = skb_shinfo(info->skb)->nr_frags;
 528                         for (j = 0; j <= nfrags; j++)
 529                                 dmas[j] = txring->ring_info[(i+1+j) &
 530                                                 (TX_RING_SIZE-1)].dma;
 531                         freed = pasemi_mac_unmap_tx_skb(mac, nfrags,
 532                                                         info->skb, dmas);
 533                 } else {
 534                         freed = 2;
 535                 }
 536         }
 537
 538         kfree(txring->ring_info);
 539         pasemi_dma_free_chan(&txring->chan);
 540
 541 }
 542
 543 static void pasemi_mac_free_rx_buffers(struct pasemi_mac *mac)
 544 {
 545         struct pasemi_mac_rxring *rx = rx_ring(mac);
 546         unsigned int i;
 547         struct pasemi_mac_buffer *info;
 548
 549         for (i = 0; i < RX_RING_SIZE; i++) {
 550                 info = &RX_DESC_INFO(rx, i);
 551                 if (info->skb && info->dma) {
 552                         dma_unmap_single(&mac->dma_pdev->dev, info->dma,
 553                                          info->skb->len, DMA_FROM_DEVICE);
 554                         dev_kfree_skb_any(info->skb);
 555                 }
 556                 info->dma = 0;
 557                 info->skb = NULL;
 558         }
 559
 560         for (i = 0; i < RX_RING_SIZE; i++)
 561                 RX_BUFF(rx, i) = 0;
 562 }
 563
 564 static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac)
 565 {
 566         pasemi_mac_free_rx_buffers(mac);
 567
 568         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
 569                           rx_ring(mac)->buffers, rx_ring(mac)->buf_dma);
 570
 571         kfree(rx_ring(mac)->ring_info);
 572         pasemi_dma_free_chan(&rx_ring(mac)->chan);
 573         mac->rx = NULL;
 574 }
 575
 576 static void pasemi_mac_replenish_rx_ring(struct net_device *dev,
 577                                          const int limit)
 578 {
 579         const struct pasemi_mac *mac = netdev_priv(dev);
 580         struct pasemi_mac_rxring *rx = rx_ring(mac);
 581         int fill, count;
 582
 583         if (limit <= 0)
 584                 return;
 585
 586         fill = rx_ring(mac)->next_to_fill;
 587         for (count = 0; count < limit; count++) {
 588                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(rx, fill);
 589                 u64 *buff = &RX_BUFF(rx, fill);
 590                 struct sk_buff *skb;
 591                 dma_addr_t dma;
 592
 593                 /* Entry in use? */
 594                 WARN_ON(*buff);
 595
 596                 skb = netdev_alloc_skb(dev, mac->bufsz);
 597                 skb_reserve(skb, LOCAL_SKB_ALIGN);
 598
 599                 if (unlikely(!skb))
 600                         break;
 601
 602                 dma = dma_map_single(&mac->dma_pdev->dev, skb->data,
 603                                      mac->bufsz - LOCAL_SKB_ALIGN,
 604                                      DMA_FROM_DEVICE);
 605
 606                 if (dma_mapping_error(&mac->dma_pdev->dev, dma)) {
 607                         dev_kfree_skb_irq(info->skb);
 608                         break;
 609                 }
 610
 611                 info->skb = skb;
 612                 info->dma = dma;
 613                 *buff = XCT_RXB_LEN(mac->bufsz) | XCT_RXB_ADDR(dma);
 614                 fill++;
 615         }
 616
 617         wmb();
 618
 619         write_dma_reg(PAS_DMA_RXINT_INCR(mac->dma_if), count);
 620
 621         rx_ring(mac)->next_to_fill = (rx_ring(mac)->next_to_fill + count) &
 622                                 (RX_RING_SIZE - 1);
 623 }
 624
 625 static void pasemi_mac_restart_rx_intr(const struct pasemi_mac *mac)
 626 {
 627         struct pasemi_mac_rxring *rx = rx_ring(mac);
 628         unsigned int reg, pcnt;
 629         /* Re-enable packet count interrupts: finally
 630          * ack the packet count interrupt we got in rx_intr.
 631          */
 632
 633         pcnt = *rx->chan.status & PAS_STATUS_PCNT_M;
 634
 635         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
 636
 637         if (*rx->chan.status & PAS_STATUS_TIMER)
 638                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 639
 640         write_iob_reg(PAS_IOB_DMA_RXCH_RESET(mac->rx->chan.chno), reg);
 641 }
 642
 643 static void pasemi_mac_restart_tx_intr(const struct pasemi_mac *mac)
 644 {
 645         unsigned int reg, pcnt;
 646
 647         /* Re-enable packet count interrupts */
 648         pcnt = *tx_ring(mac)->chan.status & PAS_STATUS_PCNT_M;
 649
 650         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
 651
 652         write_iob_reg(PAS_IOB_DMA_TXCH_RESET(tx_ring(mac)->chan.chno), reg);
 653 }
 654
 655
 656 static inline void pasemi_mac_rx_error(const struct pasemi_mac *mac,
 657                                        const u64 macrx)
 658 {
 659         unsigned int rcmdsta, ccmdsta;
 660         struct pasemi_dmachan *chan = &rx_ring(mac)->chan;
 661
 662         if (!netif_msg_rx_err(mac))
 663                 return;
 664
 665         rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
 666         ccmdsta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno));
 667
 668         printk(KERN_ERR "pasemi_mac: rx error. macrx %016llx, rx status %llx\n",
 669                 macrx, *chan->status);
 670
 671         printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
 672                 rcmdsta, ccmdsta);
 673 }
 674
 675 static inline void pasemi_mac_tx_error(const struct pasemi_mac *mac,
 676                                        const u64 mactx)
 677 {
 678         unsigned int cmdsta;
 679         struct pasemi_dmachan *chan = &tx_ring(mac)->chan;
 680
 681         if (!netif_msg_tx_err(mac))
 682                 return;
 683
 684         cmdsta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno));
 685
 686         printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016llx, "\
 687                 "tx status 0x%016llx\n", mactx, *chan->status);
 688
 689         printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
 690 }
 691
 692 static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx,
 693                                const int limit)
 694 {
 695         const struct pasemi_dmachan *chan = &rx->chan;
 696         struct pasemi_mac *mac = rx->mac;
 697         struct pci_dev *pdev = mac->dma_pdev;
 698         unsigned int n;
 699         int count, buf_index, tot_bytes, packets;
 700         struct pasemi_mac_buffer *info;
 701         struct sk_buff *skb;
 702         unsigned int len;
 703         u64 macrx, eval;
 704         dma_addr_t dma;
 705
 706         tot_bytes = 0;
 707         packets = 0;
 708
 709         spin_lock(&rx->lock);
 710
 711         n = rx->next_to_clean;
 712
 713         prefetch(&RX_DESC(rx, n));
 714
 715         for (count = 0; count < limit; count++) {
 716                 macrx = RX_DESC(rx, n);
 717                 prefetch(&RX_DESC(rx, n+4));
 718
 719                 if ((macrx & XCT_MACRX_E) ||
 720                     (*chan->status & PAS_STATUS_ERROR))
 721                         pasemi_mac_rx_error(mac, macrx);
 722
 723                 if (!(macrx & XCT_MACRX_O))
 724                         break;
 725
 726                 info = NULL;
 727
 728                 BUG_ON(!(macrx & XCT_MACRX_RR_8BRES));
 729
 730                 eval = (RX_DESC(rx, n+1) & XCT_RXRES_8B_EVAL_M) >>
 731                         XCT_RXRES_8B_EVAL_S;
 732                 buf_index = eval-1;
 733
 734                 dma = (RX_DESC(rx, n+2) & XCT_PTR_ADDR_M);
 735                 info = &RX_DESC_INFO(rx, buf_index);
 736
 737                 skb = info->skb;
 738
 739                 prefetch_skb(skb);
 740
 741                 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 742
 743                 dma_unmap_single(&pdev->dev, dma,
 744                                  mac->bufsz - LOCAL_SKB_ALIGN,
 745                                  DMA_FROM_DEVICE);
 746
 747                 if (macrx & XCT_MACRX_CRC) {
 748                         /* CRC error flagged */
 749                         mac->netdev->stats.rx_errors++;
 750                         mac->netdev->stats.rx_crc_errors++;
 751                         /* No need to free skb, it'll be reused */
 752                         goto next;
 753                 }
 754
 755                 info->skb = NULL;
 756                 info->dma = 0;
 757
 758                 if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
 759                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 760                         skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
 761                                            XCT_MACRX_CSUM_S;
 762                 } else {
 763                         skb_checksum_none_assert(skb);
 764                 }
 765
 766                 packets++;
 767                 tot_bytes += len;
 768
 769                 /* Don't include CRC */
 770                 skb_put(skb, len-4);
 771
 772                 skb->protocol = eth_type_trans(skb, mac->netdev);
 773                 napi_gro_receive(&mac->napi, skb);
 774
 775 next:
 776                 RX_DESC(rx, n) = 0;
 777                 RX_DESC(rx, n+1) = 0;
 778
 779                 /* Need to zero it out since hardware doesn't, since the
 780                  * replenish loop uses it to tell when it's done.
 781                  */
 782                 RX_BUFF(rx, buf_index) = 0;
 783
 784                 n += 4;
 785         }
 786
 787         if (n > RX_RING_SIZE) {
 788                 /* Errata 5971 workaround: L2 target of headers */
 789                 write_iob_reg(PAS_IOB_COM_PKTHDRCNT, 0);
 790                 n &= (RX_RING_SIZE-1);
 791         }
 792
 793         rx_ring(mac)->next_to_clean = n;
 794
 795         /* Increase is in number of 16-byte entries, and since each descriptor
 796          * with an 8BRES takes up 3x8 bytes (padded to 4x8), increase with
 797          * count*2.
 798          */
 799         write_dma_reg(PAS_DMA_RXCHAN_INCR(mac->rx->chan.chno), count << 1);
 800
 801         pasemi_mac_replenish_rx_ring(mac->netdev, count);
 802
 803         mac->netdev->stats.rx_bytes += tot_bytes;
 804         mac->netdev->stats.rx_packets += packets;
 805
 806         spin_unlock(&rx_ring(mac)->lock);
 807
 808         return count;
 809 }
 810
 811 /* Can't make this too large or we blow the kernel stack limits */
 812 #define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)
 813
 814 static int pasemi_mac_clean_tx(struct pasemi_mac_txring *txring)
 815 {
 816         struct pasemi_dmachan *chan = &txring->chan;
 817         struct pasemi_mac *mac = txring->mac;
 818         int i, j;
 819         unsigned int start, descr_count, buf_count, batch_limit;
 820         unsigned int ring_limit;
 821         unsigned int total_count;
 822         unsigned long flags;
 823         struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
 824         dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];
 825         int nf[TX_CLEAN_BATCHSIZE];
 826         int nr_frags;
 827
 828         total_count = 0;
 829         batch_limit = TX_CLEAN_BATCHSIZE;
 830 restart:
 831         spin_lock_irqsave(&txring->lock, flags);
 832
 833         start = txring->next_to_clean;
 834         ring_limit = txring->next_to_fill;
 835
 836         prefetch(&TX_DESC_INFO(txring, start+1).skb);
 837
 838         /* Compensate for when fill has wrapped but clean has not */
 839         if (start > ring_limit)
 840                 ring_limit += TX_RING_SIZE;
 841
 842         buf_count = 0;
 843         descr_count = 0;
 844
 845         for (i = start;
 846              descr_count < batch_limit && i < ring_limit;
 847              i += buf_count) {
 848                 u64 mactx = TX_DESC(txring, i);
 849                 struct sk_buff *skb;
 850
 851                 if ((mactx  & XCT_MACTX_E) ||
 852                     (*chan->status & PAS_STATUS_ERROR))
 853                         pasemi_mac_tx_error(mac, mactx);
 854
 855                 /* Skip over control descriptors */
 856                 if (!(mactx & XCT_MACTX_LLEN_M)) {
 857                         TX_DESC(txring, i) = 0;
 858                         TX_DESC(txring, i+1) = 0;
 859                         buf_count = 2;
 860                         continue;
 861                 }
 862
 863                 skb = TX_DESC_INFO(txring, i+1).skb;
 864                 nr_frags = TX_DESC_INFO(txring, i).dma;
 865
 866                 if (unlikely(mactx & XCT_MACTX_O))
 867                         /* Not yet transmitted */
 868                         break;
 869
 870                 buf_count = 2 + nr_frags;
 871                 /* Since we always fill with an even number of entries, make
 872                  * sure we skip any unused one at the end as well.
 873                  */
 874                 if (buf_count & 1)
 875                         buf_count++;
 876
 877                 for (j = 0; j <= nr_frags; j++)
 878                         dmas[descr_count][j] = TX_DESC_INFO(txring, i+1+j).dma;
 879
 880                 skbs[descr_count] = skb;
 881                 nf[descr_count] = nr_frags;
 882
 883                 TX_DESC(txring, i) = 0;
 884                 TX_DESC(txring, i+1) = 0;
 885
 886                 descr_count++;
 887         }
 888         txring->next_to_clean = i & (TX_RING_SIZE-1);
 889
 890         spin_unlock_irqrestore(&txring->lock, flags);
 891         netif_wake_queue(mac->netdev);
 892
 893         for (i = 0; i < descr_count; i++)
 894                 pasemi_mac_unmap_tx_skb(mac, nf[i], skbs[i], dmas[i]);
 895
 896         total_count += descr_count;
 897
 898         /* If the batch was full, try to clean more */
 899         if (descr_count == batch_limit)
 900                 goto restart;
 901
 902         return total_count;
 903 }
 904
 905
 906 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 907 {
 908         const struct pasemi_mac_rxring *rxring = data;
 909         struct pasemi_mac *mac = rxring->mac;
 910         const struct pasemi_dmachan *chan = &rxring->chan;
 911         unsigned int reg;
 912
 913         if (!(*chan->status & PAS_STATUS_CAUSE_M))
 914                 return IRQ_NONE;
 915
 916         /* Don't reset packet count so it won't fire again but clear
 917          * all others.
 918          */
 919
 920         reg = 0;
 921         if (*chan->status & PAS_STATUS_SOFT)
 922                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
 923         if (*chan->status & PAS_STATUS_ERROR)
 924                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
 925
 926         napi_schedule(&mac->napi);
 927
 928         write_iob_reg(PAS_IOB_DMA_RXCH_RESET(chan->chno), reg);
 929
 930         return IRQ_HANDLED;
 931 }
 932
 933 #define TX_CLEAN_INTERVAL HZ
 934
 935 static void pasemi_mac_tx_timer(struct timer_list *t)
 936 {
 937         struct pasemi_mac_txring *txring = from_timer(txring, t, clean_timer);
 938         struct pasemi_mac *mac = txring->mac;
 939
 940         pasemi_mac_clean_tx(txring);
 941
 942         mod_timer(&txring->clean_timer, jiffies + TX_CLEAN_INTERVAL);
 943
 944         pasemi_mac_restart_tx_intr(mac);
 945 }
 946
 947 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 948 {
 949         struct pasemi_mac_txring *txring = data;
 950         const struct pasemi_dmachan *chan = &txring->chan;
 951         struct pasemi_mac *mac = txring->mac;
 952         unsigned int reg;
 953
 954         if (!(*chan->status & PAS_STATUS_CAUSE_M))
 955                 return IRQ_NONE;
 956
 957         reg = 0;
 958
 959         if (*chan->status & PAS_STATUS_SOFT)
 960                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
 961         if (*chan->status & PAS_STATUS_ERROR)
 962                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 963
 964         mod_timer(&txring->clean_timer, jiffies + (TX_CLEAN_INTERVAL)*2);
 965
 966         napi_schedule(&mac->napi);
 967
 968         if (reg)
 969                 write_iob_reg(PAS_IOB_DMA_TXCH_RESET(chan->chno), reg);
 970
 971         return IRQ_HANDLED;
 972 }
 973
 974 static void pasemi_adjust_link(struct net_device *dev)
 975 {
 976         struct pasemi_mac *mac = netdev_priv(dev);
 977         int msg;
 978         unsigned int flags;
 979         unsigned int new_flags;
 980
 981         if (!dev->phydev->link) {
 982                 /* If no link, MAC speed settings don't matter. Just report
 983                  * link down and return.
 984                  */
 985                 if (mac->link && netif_msg_link(mac))
 986                         printk(KERN_INFO "%s: Link is down.\n", dev->name);
 987
 988                 netif_carrier_off(dev);
 989                 pasemi_mac_intf_disable(mac);
 990                 mac->link = 0;
 991
 992                 return;
 993         } else {
 994                 pasemi_mac_intf_enable(mac);
 995                 netif_carrier_on(dev);
 996         }
 997
 998         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 999         new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
1000                               PAS_MAC_CFG_PCFG_TSR_M);
1001
1002         if (!dev->phydev->duplex)
1003                 new_flags |= PAS_MAC_CFG_PCFG_HD;
1004
1005         switch (dev->phydev->speed) {
1006         case 1000:
1007                 new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
1008                              PAS_MAC_CFG_PCFG_TSR_1G;
1009                 break;
1010         case 100:
1011                 new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
1012                              PAS_MAC_CFG_PCFG_TSR_100M;
1013                 break;
1014         case 10:
1015                 new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
1016                              PAS_MAC_CFG_PCFG_TSR_10M;
1017                 break;
1018         default:
1019                 printk("Unsupported speed %d\n", dev->phydev->speed);
1020         }
1021
1022         /* Print on link or speed/duplex change */
1023         msg = mac->link != dev->phydev->link || flags != new_flags;
1024
1025         mac->duplex = dev->phydev->duplex;
1026         mac->speed = dev->phydev->speed;
1027         mac->link = dev->phydev->link;
1028
1029         if (new_flags != flags)
1030                 write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
1031
1032         if (msg && netif_msg_link(mac))
1033                 printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
1034                        dev->name, mac->speed, mac->duplex ? "full" : "half");
1035 }
1036
1037 static int pasemi_mac_phy_init(struct net_device *dev)
1038 {
1039         struct pasemi_mac *mac = netdev_priv(dev);
1040         struct device_node *dn, *phy_dn;
1041         struct phy_device *phydev;
1042
1043         dn = pci_device_to_OF_node(mac->pdev);
1044         phy_dn = of_parse_phandle(dn, "phy-handle", 0);
1045
1046         mac->link = 0;
1047         mac->speed = 0;
1048         mac->duplex = -1;
1049
1050         phydev = of_phy_connect(dev, phy_dn, &pasemi_adjust_link, 0,
1051                                 PHY_INTERFACE_MODE_SGMII);
1052
1053         of_node_put(phy_dn);
1054         if (!phydev) {
1055                 printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
1056                 return -ENODEV;
1057         }
1058
1059         return 0;
1060 }
1061
1062
1063 static int pasemi_mac_open(struct net_device *dev)
1064 {
1065         struct pasemi_mac *mac = netdev_priv(dev);
1066         unsigned int flags;
1067         int i, ret;
1068
1069         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
1070                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
1071                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
1072
1073         write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
1074
1075         ret = pasemi_mac_setup_rx_resources(dev);
1076         if (ret)
1077                 goto out_rx_resources;
1078
1079         mac->tx = pasemi_mac_setup_tx_resources(dev);
1080
1081         if (!mac->tx) {
1082                 ret = -ENOMEM;
1083                 goto out_tx_ring;
1084         }
1085
1086         /* We might already have allocated rings in case mtu was changed
1087          * before interface was brought up.
1088          */
1089         if (dev->mtu > 1500 && !mac->num_cs) {
1090                 pasemi_mac_setup_csrings(mac);
1091                 if (!mac->num_cs) {
1092                         ret = -ENOMEM;
1093                         goto out_tx_ring;
1094                 }
1095         }
1096
1097         /* Zero out rmon counters */
1098         for (i = 0; i < 32; i++)
1099                 write_mac_reg(mac, PAS_MAC_RMON(i), 0);
1100
1101         /* 0x3ff with 33MHz clock is about 31us */
1102         write_iob_reg(PAS_IOB_DMA_COM_TIMEOUTCFG,
1103                       PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0x3ff));
1104
1105         write_iob_reg(PAS_IOB_DMA_RXCH_CFG(mac->rx->chan.chno),
1106                       PAS_IOB_DMA_RXCH_CFG_CNTTH(256));
1107
1108         write_iob_reg(PAS_IOB_DMA_TXCH_CFG(mac->tx->chan.chno),
1109                       PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
1110
1111         write_mac_reg(mac, PAS_MAC_IPC_CHNL,
1112                       PAS_MAC_IPC_CHNL_DCHNO(mac->rx->chan.chno) |
1113                       PAS_MAC_IPC_CHNL_BCH(mac->rx->chan.chno));
1114
1115         /* enable rx if */
1116         write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1117                       PAS_DMA_RXINT_RCMDSTA_EN |
1118                       PAS_DMA_RXINT_RCMDSTA_DROPS_M |
1119                       PAS_DMA_RXINT_RCMDSTA_BP |
1120                       PAS_DMA_RXINT_RCMDSTA_OO |
1121                       PAS_DMA_RXINT_RCMDSTA_BT);
1122
1123         /* enable rx channel */
1124         pasemi_dma_start_chan(&rx_ring(mac)->chan, PAS_DMA_RXCHAN_CCMDSTA_DU |
1125                                                    PAS_DMA_RXCHAN_CCMDSTA_OD |
1126                                                    PAS_DMA_RXCHAN_CCMDSTA_FD |
1127                                                    PAS_DMA_RXCHAN_CCMDSTA_DT);
1128
1129         /* enable tx channel */
1130         pasemi_dma_start_chan(&tx_ring(mac)->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ |
1131                                                    PAS_DMA_TXCHAN_TCMDSTA_DB |
1132                                                    PAS_DMA_TXCHAN_TCMDSTA_DE |
1133                                                    PAS_DMA_TXCHAN_TCMDSTA_DA);
1134
1135         pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
1136
1137         write_dma_reg(PAS_DMA_RXCHAN_INCR(rx_ring(mac)->chan.chno),
1138                       RX_RING_SIZE>>1);
1139
1140         /* Clear out any residual packet count state from firmware */
1141         pasemi_mac_restart_rx_intr(mac);
1142         pasemi_mac_restart_tx_intr(mac);
1143
1144         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
1145
1146         if (mac->type == MAC_TYPE_GMAC)
1147                 flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
1148         else
1149                 flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
1150
1151         /* Enable interface in MAC */
1152         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1153
1154         ret = pasemi_mac_phy_init(dev);
1155         if (ret) {
1156                 /* Since we won't get link notification, just enable RX */
1157                 pasemi_mac_intf_enable(mac);
1158                 if (mac->type == MAC_TYPE_GMAC) {
1159                         /* Warn for missing PHY on SGMII (1Gig) ports */
1160                         dev_warn(&mac->pdev->dev,
1161                                  "PHY init failed: %d.\n", ret);
1162                         dev_warn(&mac->pdev->dev,
1163                                  "Defaulting to 1Gbit full duplex\n");
1164                 }
1165         }
1166
1167         netif_start_queue(dev);
1168         napi_enable(&mac->napi);
1169
1170         snprintf(mac->tx_irq_name, sizeof(mac->tx_irq_name), "%s tx",
1171                  dev->name);
1172
1173         ret = request_irq(mac->tx->chan.irq, pasemi_mac_tx_intr, 0,
1174                           mac->tx_irq_name, mac->tx);
1175         if (ret) {
1176                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1177                         mac->tx->chan.irq, ret);
1178                 goto out_tx_int;
1179         }
1180
1181         snprintf(mac->rx_irq_name, sizeof(mac->rx_irq_name), "%s rx",
1182                  dev->name);
1183
1184         ret = request_irq(mac->rx->chan.irq, pasemi_mac_rx_intr, 0,
1185                           mac->rx_irq_name, mac->rx);
1186         if (ret) {
1187                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1188                         mac->rx->chan.irq, ret);
1189                 goto out_rx_int;
1190         }
1191
1192         if (dev->phydev)
1193                 phy_start(dev->phydev);
1194
1195         timer_setup(&mac->tx->clean_timer, pasemi_mac_tx_timer, 0);
1196         mod_timer(&mac->tx->clean_timer, jiffies + HZ);
1197
1198         return 0;
1199
1200 out_rx_int:
1201         free_irq(mac->tx->chan.irq, mac->tx);
1202 out_tx_int:
1203         napi_disable(&mac->napi);
1204         netif_stop_queue(dev);
1205 out_tx_ring:
1206         if (mac->tx)
1207                 pasemi_mac_free_tx_resources(mac);
1208         pasemi_mac_free_rx_resources(mac);
1209 out_rx_resources:
1210
1211         return ret;
1212 }
1213
1214 #define MAX_RETRIES 5000
1215
1216 static void pasemi_mac_pause_txchan(struct pasemi_mac *mac)
1217 {
1218         unsigned int sta, retries;
1219         int txch = tx_ring(mac)->chan.chno;
1220
1221         write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch),
1222                       PAS_DMA_TXCHAN_TCMDSTA_ST);
1223
1224         for (retries = 0; retries < MAX_RETRIES; retries++) {
1225                 sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch));
1226                 if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT))
1227                         break;
1228                 cond_resched();
1229         }
1230
1231         if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)
1232                 dev_err(&mac->dma_pdev->dev,
1233                         "Failed to stop tx channel, tcmdsta %08x\n", sta);
1234
1235         write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch), 0);
1236 }
1237
1238 static void pasemi_mac_pause_rxchan(struct pasemi_mac *mac)
1239 {
1240         unsigned int sta, retries;
1241         int rxch = rx_ring(mac)->chan.chno;
1242
1243         write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch),
1244                       PAS_DMA_RXCHAN_CCMDSTA_ST);
1245         for (retries = 0; retries < MAX_RETRIES; retries++) {
1246                 sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1247                 if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT))
1248                         break;
1249                 cond_resched();
1250         }
1251
1252         if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)
1253                 dev_err(&mac->dma_pdev->dev,
1254                         "Failed to stop rx channel, ccmdsta 08%x\n", sta);
1255         write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch), 0);
1256 }
1257
1258 static void pasemi_mac_pause_rxint(struct pasemi_mac *mac)
1259 {
1260         unsigned int sta, retries;
1261
1262         write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1263                       PAS_DMA_RXINT_RCMDSTA_ST);
1264         for (retries = 0; retries < MAX_RETRIES; retries++) {
1265                 sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1266                 if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT))
1267                         break;
1268                 cond_resched();
1269         }
1270
1271         if (sta & PAS_DMA_RXINT_RCMDSTA_ACT)
1272                 dev_err(&mac->dma_pdev->dev,
1273                         "Failed to stop rx interface, rcmdsta %08x\n", sta);
1274         write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
1275 }
1276
1277 static int pasemi_mac_close(struct net_device *dev)
1278 {
1279         struct pasemi_mac *mac = netdev_priv(dev);
1280         unsigned int sta;
1281         int rxch, txch, i;
1282
1283         rxch = rx_ring(mac)->chan.chno;
1284         txch = tx_ring(mac)->chan.chno;
1285
1286         if (dev->phydev) {
1287                 phy_stop(dev->phydev);
1288                 phy_disconnect(dev->phydev);
1289         }
1290
1291         del_timer_sync(&mac->tx->clean_timer);
1292
1293         netif_stop_queue(dev);
1294         napi_disable(&mac->napi);
1295
1296         sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1297         if (sta & (PAS_DMA_RXINT_RCMDSTA_BP |
1298                       PAS_DMA_RXINT_RCMDSTA_OO |
1299                       PAS_DMA_RXINT_RCMDSTA_BT))
1300                 printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta);
1301
1302         sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1303         if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU |
1304                      PAS_DMA_RXCHAN_CCMDSTA_OD |
1305                      PAS_DMA_RXCHAN_CCMDSTA_FD |
1306                      PAS_DMA_RXCHAN_CCMDSTA_DT))
1307                 printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta);
1308
1309         sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch));
1310         if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ | PAS_DMA_TXCHAN_TCMDSTA_DB |
1311                       PAS_DMA_TXCHAN_TCMDSTA_DE | PAS_DMA_TXCHAN_TCMDSTA_DA))
1312                 printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta);
1313
1314         /* Clean out any pending buffers */
1315         pasemi_mac_clean_tx(tx_ring(mac));
1316         pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
1317
1318         pasemi_mac_pause_txchan(mac);
1319         pasemi_mac_pause_rxint(mac);
1320         pasemi_mac_pause_rxchan(mac);
1321         pasemi_mac_intf_disable(mac);
1322
1323         free_irq(mac->tx->chan.irq, mac->tx);
1324         free_irq(mac->rx->chan.irq, mac->rx);
1325
1326         for (i = 0; i < mac->num_cs; i++) {
1327                 pasemi_mac_free_csring(mac->cs[i]);
1328                 mac->cs[i] = NULL;
1329         }
1330
1331         mac->num_cs = 0;
1332
1333         /* Free resources */
1334         pasemi_mac_free_rx_resources(mac);
1335         pasemi_mac_free_tx_resources(mac);
1336
1337         return 0;
1338 }
1339
1340 static void pasemi_mac_queue_csdesc(const struct sk_buff *skb,
1341                                     const dma_addr_t *map,
1342                                     const unsigned int *map_size,
1343                                     struct pasemi_mac_txring *txring,
1344                                     struct pasemi_mac_csring *csring)
1345 {
1346         u64 fund;
1347         dma_addr_t cs_dest;
1348         const int nh_off = skb_network_offset(skb);
1349         const int nh_len = skb_network_header_len(skb);
1350         const int nfrags = skb_shinfo(skb)->nr_frags;
1351         int cs_size, i, fill, hdr, evt;
1352         dma_addr_t csdma;
1353
1354         fund = XCT_FUN_ST | XCT_FUN_RR_8BRES |
1355                XCT_FUN_O | XCT_FUN_FUN(csring->fun) |
1356                XCT_FUN_CRM_SIG | XCT_FUN_LLEN(skb->len - nh_off) |
1357                XCT_FUN_SHL(nh_len >> 2) | XCT_FUN_SE;
1358
1359         switch (ip_hdr(skb)->protocol) {
1360         case IPPROTO_TCP:
1361                 fund |= XCT_FUN_SIG_TCP4;
1362                 /* TCP checksum is 16 bytes into the header */
1363                 cs_dest = map[0] + skb_transport_offset(skb) + 16;
1364                 break;
1365         case IPPROTO_UDP:
1366                 fund |= XCT_FUN_SIG_UDP4;
1367                 /* UDP checksum is 6 bytes into the header */
1368                 cs_dest = map[0] + skb_transport_offset(skb) + 6;
1369                 break;
1370         default:
1371                 BUG();
1372         }
1373
1374         /* Do the checksum offloaded */
1375         fill = csring->next_to_fill;
1376         hdr = fill;
1377
1378         CS_DESC(csring, fill++) = fund;
1379         /* Room for 8BRES. Checksum result is really 2 bytes into it */
1380         csdma = csring->chan.ring_dma + (fill & (CS_RING_SIZE-1)) * 8 + 2;
1381         CS_DESC(csring, fill++) = 0;
1382
1383         CS_DESC(csring, fill) = XCT_PTR_LEN(map_size[0]-nh_off) | XCT_PTR_ADDR(map[0]+nh_off);
1384         for (i = 1; i <= nfrags; i++)
1385                 CS_DESC(csring, fill+i) = XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1386
1387         fill += i;
1388         if (fill & 1)
1389                 fill++;
1390
1391         /* Copy the result into the TCP packet */
1392         CS_DESC(csring, fill++) = XCT_FUN_O | XCT_FUN_FUN(csring->fun) |
1393                                   XCT_FUN_LLEN(2) | XCT_FUN_SE;
1394         CS_DESC(csring, fill++) = XCT_PTR_LEN(2) | XCT_PTR_ADDR(cs_dest) | XCT_PTR_T;
1395         CS_DESC(csring, fill++) = XCT_PTR_LEN(2) | XCT_PTR_ADDR(csdma);
1396         fill++;
1397
1398         evt = !csring->last_event;
1399         csring->last_event = evt;
1400
1401         /* Event handshaking with MAC TX */
1402         CS_DESC(csring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
1403                                   CTRL_CMD_ETYPE_SET | CTRL_CMD_REG(csring->events[evt]);
1404         CS_DESC(csring, fill++) = 0;
1405         CS_DESC(csring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
1406                                   CTRL_CMD_ETYPE_WCLR | CTRL_CMD_REG(csring->events[!evt]);
1407         CS_DESC(csring, fill++) = 0;
1408         csring->next_to_fill = fill & (CS_RING_SIZE-1);
1409
1410         cs_size = fill - hdr;
1411         write_dma_reg(PAS_DMA_TXCHAN_INCR(csring->chan.chno), (cs_size) >> 1);
1412
1413         /* TX-side event handshaking */
1414         fill = txring->next_to_fill;
1415         TX_DESC(txring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
1416                                   CTRL_CMD_ETYPE_WSET | CTRL_CMD_REG(csring->events[evt]);
1417         TX_DESC(txring, fill++) = 0;
1418         TX_DESC(txring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
1419                                   CTRL_CMD_ETYPE_CLR | CTRL_CMD_REG(csring->events[!evt]);
1420         TX_DESC(txring, fill++) = 0;
1421         txring->next_to_fill = fill;
1422
1423         write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), 2);
1424 }
1425
1426 static netdev_tx_t pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
1427 {
1428         struct pasemi_mac * const mac = netdev_priv(dev);
1429         struct pasemi_mac_txring * const txring = tx_ring(mac);
1430         struct pasemi_mac_csring *csring;
1431         u64 dflags = 0;
1432         u64 mactx;
1433         dma_addr_t map[MAX_SKB_FRAGS+1];
1434         unsigned int map_size[MAX_SKB_FRAGS+1];
1435         unsigned long flags;
1436         int i, nfrags;
1437         int fill;
1438         const int nh_off = skb_network_offset(skb);
1439         const int nh_len = skb_network_header_len(skb);
1440
1441         prefetch(&txring->ring_info);
1442
1443         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;
1444
1445         nfrags = skb_shinfo(skb)->nr_frags;
1446
1447         map[0] = dma_map_single(&mac->dma_pdev->dev, skb->data,
1448                                 skb_headlen(skb), DMA_TO_DEVICE);
1449         map_size[0] = skb_headlen(skb);
1450         if (dma_mapping_error(&mac->dma_pdev->dev, map[0]))
1451                 goto out_err_nolock;
1452
1453         for (i = 0; i < nfrags; i++) {
1454                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1455
1456                 map[i + 1] = skb_frag_dma_map(&mac->dma_pdev->dev, frag, 0,
1457                                               skb_frag_size(frag), DMA_TO_DEVICE);
1458                 map_size[i+1] = skb_frag_size(frag);
1459                 if (dma_mapping_error(&mac->dma_pdev->dev, map[i + 1])) {
1460                         nfrags = i;
1461                         goto out_err_nolock;
1462                 }
1463         }
1464
1465         if (skb->ip_summed == CHECKSUM_PARTIAL && skb->len <= 1540) {
1466                 switch (ip_hdr(skb)->protocol) {
1467                 case IPPROTO_TCP:
1468                         dflags |= XCT_MACTX_CSUM_TCP;
1469                         dflags |= XCT_MACTX_IPH(nh_len >> 2);
1470                         dflags |= XCT_MACTX_IPO(nh_off);
1471                         break;
1472                 case IPPROTO_UDP:
1473                         dflags |= XCT_MACTX_CSUM_UDP;
1474                         dflags |= XCT_MACTX_IPH(nh_len >> 2);
1475                         dflags |= XCT_MACTX_IPO(nh_off);
1476                         break;
1477                 default:
1478                         WARN_ON(1);
1479                 }
1480         }
1481
1482         mactx = dflags | XCT_MACTX_LLEN(skb->len);
1483
1484         spin_lock_irqsave(&txring->lock, flags);
1485
1486         /* Avoid stepping on the same cache line that the DMA controller
1487          * is currently about to send, so leave at least 8 words available.
1488          * Total free space needed is mactx + fragments + 8
1489          */
1490         if (RING_AVAIL(txring) < nfrags + 14) {
1491                 /* no room -- stop the queue and wait for tx intr */
1492                 netif_stop_queue(dev);
1493                 goto out_err;
1494         }
1495
1496         /* Queue up checksum + event descriptors, if needed */
1497         if (mac->num_cs && skb->ip_summed == CHECKSUM_PARTIAL && skb->len > 1540) {
1498                 csring = mac->cs[mac->last_cs];
1499                 mac->last_cs = (mac->last_cs + 1) % mac->num_cs;
1500
1501                 pasemi_mac_queue_csdesc(skb, map, map_size, txring, csring);
1502         }
1503
1504         fill = txring->next_to_fill;
1505         TX_DESC(txring, fill) = mactx;
1506         TX_DESC_INFO(txring, fill).dma = nfrags;
1507         fill++;
1508         TX_DESC_INFO(txring, fill).skb = skb;
1509         for (i = 0; i <= nfrags; i++) {
1510                 TX_DESC(txring, fill+i) =
1511                         XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1512                 TX_DESC_INFO(txring, fill+i).dma = map[i];
1513         }
1514
1515         /* We have to add an even number of 8-byte entries to the ring
1516          * even if the last one is unused. That means always an odd number
1517          * of pointers + one mactx descriptor.
1518          */
1519         if (nfrags & 1)
1520                 nfrags++;
1521
1522         txring->next_to_fill = (fill + nfrags + 1) & (TX_RING_SIZE-1);
1523
1524         dev->stats.tx_packets++;
1525         dev->stats.tx_bytes += skb->len;
1526
1527         spin_unlock_irqrestore(&txring->lock, flags);
1528
1529         write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), (nfrags+2) >> 1);
1530
1531         return NETDEV_TX_OK;
1532
1533 out_err:
1534         spin_unlock_irqrestore(&txring->lock, flags);
1535 out_err_nolock:
1536         while (nfrags--)
1537                 dma_unmap_single(&mac->dma_pdev->dev, map[nfrags],
1538                                  map_size[nfrags], DMA_TO_DEVICE);
1539
1540         return NETDEV_TX_BUSY;
1541 }
1542
1543 static void pasemi_mac_set_rx_mode(struct net_device *dev)
1544 {
1545         const struct pasemi_mac *mac = netdev_priv(dev);
1546         unsigned int flags;
1547
1548         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1549
1550         /* Set promiscuous */
1551         if (dev->flags & IFF_PROMISC)
1552                 flags |= PAS_MAC_CFG_PCFG_PR;
1553         else
1554                 flags &= ~PAS_MAC_CFG_PCFG_PR;
1555
1556         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1557 }
1558
1559
1560 static int pasemi_mac_poll(struct napi_struct *napi, int budget)
1561 {
1562         struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
1563         int pkts;
1564
1565         pasemi_mac_clean_tx(tx_ring(mac));
1566         pkts = pasemi_mac_clean_rx(rx_ring(mac), budget);
1567         if (pkts < budget) {
1568                 /* all done, no more packets present */
1569                 napi_complete_done(napi, pkts);
1570
1571                 pasemi_mac_restart_rx_intr(mac);
1572                 pasemi_mac_restart_tx_intr(mac);
1573         }
1574         return pkts;
1575 }
1576
1577 #ifdef CONFIG_NET_POLL_CONTROLLER
1578 /*
1579  * Polling 'interrupt' - used by things like netconsole to send skbs
1580  * without having to re-enable interrupts. It's not called while
1581  * the interrupt routine is executing.
1582  */
1583 static void pasemi_mac_netpoll(struct net_device *dev)
1584 {
1585         const struct pasemi_mac *mac = netdev_priv(dev);
1586
1587         disable_irq(mac->tx->chan.irq);
1588         pasemi_mac_tx_intr(mac->tx->chan.irq, mac->tx);
1589         enable_irq(mac->tx->chan.irq);
1590
1591         disable_irq(mac->rx->chan.irq);
1592         pasemi_mac_rx_intr(mac->rx->chan.irq, mac->rx);
1593         enable_irq(mac->rx->chan.irq);
1594 }
1595 #endif
1596
1597 static int pasemi_mac_change_mtu(struct net_device *dev, int new_mtu)
1598 {
1599         struct pasemi_mac *mac = netdev_priv(dev);
1600         unsigned int reg;
1601         unsigned int rcmdsta = 0;
1602         int running;
1603         int ret = 0;
1604
1605         running = netif_running(dev);
1606
1607         if (running) {
1608                 /* Need to stop the interface, clean out all already
1609                  * received buffers, free all unused buffers on the RX
1610                  * interface ring, then finally re-fill the rx ring with
1611                  * the new-size buffers and restart.
1612                  */
1613
1614                 napi_disable(&mac->napi);
1615                 netif_tx_disable(dev);
1616                 pasemi_mac_intf_disable(mac);
1617
1618                 rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1619                 pasemi_mac_pause_rxint(mac);
1620                 pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
1621                 pasemi_mac_free_rx_buffers(mac);
1622
1623         }
1624
1625         /* Setup checksum channels if large MTU and none already allocated */
1626         if (new_mtu > PE_DEF_MTU && !mac->num_cs) {
1627                 pasemi_mac_setup_csrings(mac);
1628                 if (!mac->num_cs) {
1629                         ret = -ENOMEM;
1630                         goto out;
1631                 }
1632         }
1633
1634         /* Change maxf, i.e. what size frames are accepted.
1635          * Need room for ethernet header and CRC word
1636          */
1637         reg = read_mac_reg(mac, PAS_MAC_CFG_MACCFG);
1638         reg &= ~PAS_MAC_CFG_MACCFG_MAXF_M;
1639         reg |= PAS_MAC_CFG_MACCFG_MAXF(new_mtu + ETH_HLEN + 4);
1640         write_mac_reg(mac, PAS_MAC_CFG_MACCFG, reg);
1641
1642         WRITE_ONCE(dev->mtu, new_mtu);
1643         /* MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
1644         mac->bufsz = new_mtu + ETH_HLEN + ETH_FCS_LEN + LOCAL_SKB_ALIGN + 128;
1645
1646 out:
1647         if (running) {
1648                 write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1649                               rcmdsta | PAS_DMA_RXINT_RCMDSTA_EN);
1650
1651                 rx_ring(mac)->next_to_fill = 0;
1652                 pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE-1);
1653
1654                 napi_enable(&mac->napi);
1655                 netif_start_queue(dev);
1656                 pasemi_mac_intf_enable(mac);
1657         }
1658
1659         return ret;
1660 }
1661
1662 static const struct net_device_ops pasemi_netdev_ops = {
1663         .ndo_open               = pasemi_mac_open,
1664         .ndo_stop               = pasemi_mac_close,
1665         .ndo_start_xmit         = pasemi_mac_start_tx,
1666         .ndo_set_rx_mode        = pasemi_mac_set_rx_mode,
1667         .ndo_set_mac_address    = pasemi_mac_set_mac_addr,
1668         .ndo_change_mtu         = pasemi_mac_change_mtu,
1669         .ndo_validate_addr      = eth_validate_addr,
1670 #ifdef CONFIG_NET_POLL_CONTROLLER
1671         .ndo_poll_controller    = pasemi_mac_netpoll,
1672 #endif
1673 };
1674
1675 static int
1676 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1677 {
1678         struct net_device *dev;
1679         struct pasemi_mac *mac;
1680         int err, ret;
1681
1682         err = pci_enable_device(pdev);
1683         if (err)
1684                 return err;
1685
1686         dev = alloc_etherdev(sizeof(struct pasemi_mac));
1687         if (dev == NULL) {
1688                 err = -ENOMEM;
1689                 goto out_disable_device;
1690         }
1691
1692         pci_set_drvdata(pdev, dev);
1693         SET_NETDEV_DEV(dev, &pdev->dev);
1694
1695         mac = netdev_priv(dev);
1696
1697         mac->pdev = pdev;
1698         mac->netdev = dev;
1699
1700         netif_napi_add(dev, &mac->napi, pasemi_mac_poll);
1701
1702         dev->features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
1703                         NETIF_F_GSO;
1704         dev->lltx = true;
1705
1706         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
1707         if (!mac->dma_pdev) {
1708                 dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
1709                 err = -ENODEV;
1710                 goto out;
1711         }
1712         dma_set_mask(&mac->dma_pdev->dev, DMA_BIT_MASK(64));
1713
1714         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
1715         if (!mac->iob_pdev) {
1716                 dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
1717                 err = -ENODEV;
1718                 goto out;
1719         }
1720
1721         /* get mac addr from device tree */
1722         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1723                 err = -ENODEV;
1724                 goto out;
1725         }
1726         eth_hw_addr_set(dev, mac->mac_addr);
1727
1728         ret = mac_to_intf(mac);
1729         if (ret < 0) {
1730                 dev_err(&mac->pdev->dev, "Can't map DMA interface\n");
1731                 err = -ENODEV;
1732                 goto out;
1733         }
1734         mac->dma_if = ret;
1735
1736         switch (pdev->device) {
1737         case 0xa005:
1738                 mac->type = MAC_TYPE_GMAC;
1739                 break;
1740         case 0xa006:
1741                 mac->type = MAC_TYPE_XAUI;
1742                 break;
1743         default:
1744                 err = -ENODEV;
1745                 goto out;
1746         }
1747
1748         dev->netdev_ops = &pasemi_netdev_ops;
1749         dev->mtu = PE_DEF_MTU;
1750
1751         /* MTU range: 64 - 9000 */
1752         dev->min_mtu = PE_MIN_MTU;
1753         dev->max_mtu = PE_MAX_MTU;
1754
1755         /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
1756         mac->bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + LOCAL_SKB_ALIGN + 128;
1757
1758         dev->ethtool_ops = &pasemi_mac_ethtool_ops;
1759
1760         if (err)
1761                 goto out;
1762
1763         mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1764
1765         /* Enable most messages by default */
1766         mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
1767
1768         err = register_netdev(dev);
1769
1770         if (err) {
1771                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1772                         err);
1773                 goto out;
1774         } else if (netif_msg_probe(mac)) {
1775                 printk(KERN_INFO "%s: PA Semi %s: intf %d, hw addr %pM\n",
1776                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1777                        mac->dma_if, dev->dev_addr);
1778         }
1779
1780         return err;
1781
1782 out:
1783         pci_dev_put(mac->iob_pdev);
1784         pci_dev_put(mac->dma_pdev);
1785
1786         free_netdev(dev);
1787 out_disable_device:
1788         pci_disable_device(pdev);
1789         return err;
1790
1791 }
1792
1793 static void pasemi_mac_remove(struct pci_dev *pdev)
1794 {
1795         struct net_device *netdev = pci_get_drvdata(pdev);
1796         struct pasemi_mac *mac;
1797
1798         if (!netdev)
1799                 return;
1800
1801         mac = netdev_priv(netdev);
1802
1803         unregister_netdev(netdev);
1804
1805         pci_disable_device(pdev);
1806         pci_dev_put(mac->dma_pdev);
1807         pci_dev_put(mac->iob_pdev);
1808
1809         pasemi_dma_free_chan(&mac->tx->chan);
1810         pasemi_dma_free_chan(&mac->rx->chan);
1811
1812         free_netdev(netdev);
1813 }
1814
1815 static const struct pci_device_id pasemi_mac_pci_tbl[] = {
1816         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1817         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1818         { },
1819 };
1820
1821 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1822
1823 static struct pci_driver pasemi_mac_driver = {
1824         .name           = "pasemi_mac",
1825         .id_table       = pasemi_mac_pci_tbl,
1826         .probe          = pasemi_mac_probe,
1827         .remove         = pasemi_mac_remove,
1828 };
1829
1830 static void __exit pasemi_mac_cleanup_module(void)
1831 {
1832         pci_unregister_driver(&pasemi_mac_driver);
1833 }
1834
1835 static int pasemi_mac_init_module(void)
1836 {
1837         int err;
1838
1839         err = pasemi_dma_init();
1840         if (err)
1841                 return err;
1842
1843         return pci_register_driver(&pasemi_mac_driver);
1844 }
1845
1846 module_init(pasemi_mac_init_module);
1847 module_exit(pasemi_mac_cleanup_module);