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 #include <linux/inet_lro.h>
  36
  37 #include <asm/irq.h>
  38 #include <asm/firmware.h>
  39 #include <asm/pasemi_dma.h>
  40
  41 #include "pasemi_mac.h"
  42
  43 /* We have our own align, since ppc64 in general has it at 0 because
  44  * of design flaws in some of the server bridge chips. However, for
  45  * PWRficient doing the unaligned copies is more expensive than doing
  46  * unaligned DMA, so make sure the data is aligned instead.
  47  */
  48 #define LOCAL_SKB_ALIGN 2
  49
  50 /* TODO list
  51  *
  52  * - Multicast support
  53  * - Large MTU support
  54  * - SW LRO
  55  * - Multiqueue RX/TX
  56  */
  57
  58
  59 /* Must be a power of two */
  60 #define RX_RING_SIZE 2048
  61 #define TX_RING_SIZE 4096
  62
  63 #define LRO_MAX_AGGR 64
  64
  65 #define DEFAULT_MSG_ENABLE        \
  66         (NETIF_MSG_DRV          | \
  67          NETIF_MSG_PROBE        | \
  68          NETIF_MSG_LINK         | \
  69          NETIF_MSG_TIMER        | \
  70          NETIF_MSG_IFDOWN       | \
  71          NETIF_MSG_IFUP         | \
  72          NETIF_MSG_RX_ERR       | \
  73          NETIF_MSG_TX_ERR)
  74
  75 #define TX_DESC(tx, num)        ((tx)->chan.ring_virt[(num) & (TX_RING_SIZE-1)])
  76 #define TX_DESC_INFO(tx, num)   ((tx)->ring_info[(num) & (TX_RING_SIZE-1)])
  77 #define RX_DESC(rx, num)        ((rx)->chan.ring_virt[(num) & (RX_RING_SIZE-1)])
  78 #define RX_DESC_INFO(rx, num)   ((rx)->ring_info[(num) & (RX_RING_SIZE-1)])
  79 #define RX_BUFF(rx, num)        ((rx)->buffers[(num) & (RX_RING_SIZE-1)])
  80
  81 #define RING_USED(ring)         (((ring)->next_to_fill - (ring)->next_to_clean) \
  82                                  & ((ring)->size - 1))
  83 #define RING_AVAIL(ring)        ((ring->size) - RING_USED(ring))
  84
  85 #define BUF_SIZE 1646 /* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
  86
  87 MODULE_LICENSE("GPL");
  88 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
  89 MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
  90
  91 static int debug = -1;  /* -1 == use DEFAULT_MSG_ENABLE as value */
  92 module_param(debug, int, 0);
  93 MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
  94
  95 static int translation_enabled(void)
  96 {
  97 #if defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE)
  98         return 1;
  99 #else
 100         return firmware_has_feature(FW_FEATURE_LPAR);
 101 #endif
 102 }
 103
 104 static void write_iob_reg(unsigned int reg, unsigned int val)
 105 {
 106         pasemi_write_iob_reg(reg, val);
 107 }
 108
 109 static unsigned int read_mac_reg(const struct pasemi_mac *mac, unsigned int reg)
 110 {
 111         return pasemi_read_mac_reg(mac->dma_if, reg);
 112 }
 113
 114 static void write_mac_reg(const struct pasemi_mac *mac, unsigned int reg,
 115                           unsigned int val)
 116 {
 117         pasemi_write_mac_reg(mac->dma_if, reg, val);
 118 }
 119
 120 static unsigned int read_dma_reg(unsigned int reg)
 121 {
 122         return pasemi_read_dma_reg(reg);
 123 }
 124
 125 static void write_dma_reg(unsigned int reg, unsigned int val)
 126 {
 127         pasemi_write_dma_reg(reg, val);
 128 }
 129
 130 static struct pasemi_mac_rxring *rx_ring(const struct pasemi_mac *mac)
 131 {
 132         return mac->rx;
 133 }
 134
 135 static struct pasemi_mac_txring *tx_ring(const struct pasemi_mac *mac)
 136 {
 137         return mac->tx;
 138 }
 139
 140 static inline void prefetch_skb(const struct sk_buff *skb)
 141 {
 142         const void *d = skb;
 143
 144         prefetch(d);
 145         prefetch(d+64);
 146         prefetch(d+128);
 147         prefetch(d+192);
 148 }
 149
 150 static int mac_to_intf(struct pasemi_mac *mac)
 151 {
 152         struct pci_dev *pdev = mac->pdev;
 153         u32 tmp;
 154         int nintf, off, i, j;
 155         int devfn = pdev->devfn;
 156
 157         tmp = read_dma_reg(PAS_DMA_CAP_IFI);
 158         nintf = (tmp & PAS_DMA_CAP_IFI_NIN_M) >> PAS_DMA_CAP_IFI_NIN_S;
 159         off = (tmp & PAS_DMA_CAP_IFI_IOFF_M) >> PAS_DMA_CAP_IFI_IOFF_S;
 160
 161         /* IOFF contains the offset to the registers containing the
 162          * DMA interface-to-MAC-pci-id mappings, and NIN contains number
 163          * of total interfaces. Each register contains 4 devfns.
 164          * Just do a linear search until we find the devfn of the MAC
 165          * we're trying to look up.
 166          */
 167
 168         for (i = 0; i < (nintf+3)/4; i++) {
 169                 tmp = read_dma_reg(off+4*i);
 170                 for (j = 0; j < 4; j++) {
 171                         if (((tmp >> (8*j)) & 0xff) == devfn)
 172                                 return i*4 + j;
 173                 }
 174         }
 175         return -1;
 176 }
 177
 178 static int pasemi_get_mac_addr(struct pasemi_mac *mac)
 179 {
 180         struct pci_dev *pdev = mac->pdev;
 181         struct device_node *dn = pci_device_to_OF_node(pdev);
 182         int len;
 183         const u8 *maddr;
 184         u8 addr[6];
 185
 186         if (!dn) {
 187                 dev_dbg(&pdev->dev,
 188                           "No device node for mac, not configuring\n");
 189                 return -ENOENT;
 190         }
 191
 192         maddr = of_get_property(dn, "local-mac-address", &len);
 193
 194         if (maddr && len == 6) {
 195                 memcpy(mac->mac_addr, maddr, 6);
 196                 return 0;
 197         }
 198
 199         /* Some old versions of firmware mistakenly uses mac-address
 200          * (and as a string) instead of a byte array in local-mac-address.
 201          */
 202
 203         if (maddr == NULL)
 204                 maddr = of_get_property(dn, "mac-address", NULL);
 205
 206         if (maddr == NULL) {
 207                 dev_warn(&pdev->dev,
 208                          "no mac address in device tree, not configuring\n");
 209                 return -ENOENT;
 210         }
 211
 212         if (sscanf(maddr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &addr[0],
 213                    &addr[1], &addr[2], &addr[3], &addr[4], &addr[5]) != 6) {
 214                 dev_warn(&pdev->dev,
 215                          "can't parse mac address, not configuring\n");
 216                 return -EINVAL;
 217         }
 218
 219         memcpy(mac->mac_addr, addr, 6);
 220
 221         return 0;
 222 }
 223
 224 static int pasemi_mac_set_mac_addr(struct net_device *dev, void *p)
 225 {
 226         struct pasemi_mac *mac = netdev_priv(dev);
 227         struct sockaddr *addr = p;
 228         unsigned int adr0, adr1;
 229
 230         if (!is_valid_ether_addr(addr->sa_data))
 231                 return -EINVAL;
 232
 233         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
 234
 235         adr0 = dev->dev_addr[2] << 24 |
 236                dev->dev_addr[3] << 16 |
 237                dev->dev_addr[4] << 8 |
 238                dev->dev_addr[5];
 239         adr1 = read_mac_reg(mac, PAS_MAC_CFG_ADR1);
 240         adr1 &= ~0xffff;
 241         adr1 |= dev->dev_addr[0] << 8 | dev->dev_addr[1];
 242
 243         pasemi_mac_intf_disable(mac);
 244         write_mac_reg(mac, PAS_MAC_CFG_ADR0, adr0);
 245         write_mac_reg(mac, PAS_MAC_CFG_ADR1, adr1);
 246         pasemi_mac_intf_enable(mac);
 247
 248         return 0;
 249 }
 250
 251 static int get_skb_hdr(struct sk_buff *skb, void **iphdr,
 252                        void **tcph, u64 *hdr_flags, void *data)
 253 {
 254         u64 macrx = (u64) data;
 255         unsigned int ip_len;
 256         struct iphdr *iph;
 257
 258         /* IPv4 header checksum failed */
 259         if ((macrx & XCT_MACRX_HTY_M) != XCT_MACRX_HTY_IPV4_OK)
 260                 return -1;
 261
 262         /* non tcp packet */
 263         skb_reset_network_header(skb);
 264         iph = ip_hdr(skb);
 265         if (iph->protocol != IPPROTO_TCP)
 266                 return -1;
 267
 268         ip_len = ip_hdrlen(skb);
 269         skb_set_transport_header(skb, ip_len);
 270         *tcph = tcp_hdr(skb);
 271
 272         /* check if ip header and tcp header are complete */
 273         if (iph->tot_len < ip_len + tcp_hdrlen(skb))
 274                 return -1;
 275
 276         *hdr_flags = LRO_IPV4 | LRO_TCP;
 277         *iphdr = iph;
 278
 279         return 0;
 280 }
 281
 282 static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
 283                                     const int nfrags,
 284                                     struct sk_buff *skb,
 285                                     const dma_addr_t *dmas)
 286 {
 287         int f;
 288         struct pci_dev *pdev = mac->dma_pdev;
 289
 290         pci_unmap_single(pdev, dmas[0], skb_headlen(skb), PCI_DMA_TODEVICE);
 291
 292         for (f = 0; f < nfrags; f++) {
 293                 skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
 294
 295                 pci_unmap_page(pdev, dmas[f+1], frag->size, PCI_DMA_TODEVICE);
 296         }
 297         dev_kfree_skb_irq(skb);
 298
 299         /* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
 300          * aligned up to a power of 2
 301          */
 302         return (nfrags + 3) & ~1;
 303 }
 304
 305 static int pasemi_mac_setup_rx_resources(const struct net_device *dev)
 306 {
 307         struct pasemi_mac_rxring *ring;
 308         struct pasemi_mac *mac = netdev_priv(dev);
 309         int chno;
 310         unsigned int cfg;
 311
 312         ring = pasemi_dma_alloc_chan(RXCHAN, sizeof(struct pasemi_mac_rxring),
 313                                      offsetof(struct pasemi_mac_rxring, chan));
 314
 315         if (!ring) {
 316                 dev_err(&mac->pdev->dev, "Can't allocate RX channel\n");
 317                 goto out_chan;
 318         }
 319         chno = ring->chan.chno;
 320
 321         spin_lock_init(&ring->lock);
 322
 323         ring->size = RX_RING_SIZE;
 324         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 325                                   RX_RING_SIZE, GFP_KERNEL);
 326
 327         if (!ring->ring_info)
 328                 goto out_ring_info;
 329
 330         /* Allocate descriptors */
 331         if (pasemi_dma_alloc_ring(&ring->chan, RX_RING_SIZE))
 332                 goto out_ring_desc;
 333
 334         ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
 335                                            RX_RING_SIZE * sizeof(u64),
 336                                            &ring->buf_dma, GFP_KERNEL);
 337         if (!ring->buffers)
 338                 goto out_ring_desc;
 339
 340         memset(ring->buffers, 0, RX_RING_SIZE * sizeof(u64));
 341
 342         write_dma_reg(PAS_DMA_RXCHAN_BASEL(chno),
 343                       PAS_DMA_RXCHAN_BASEL_BRBL(ring->chan.ring_dma));
 344
 345         write_dma_reg(PAS_DMA_RXCHAN_BASEU(chno),
 346                       PAS_DMA_RXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32) |
 347                       PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
 348
 349         cfg = PAS_DMA_RXCHAN_CFG_HBU(2);
 350
 351         if (translation_enabled())
 352                 cfg |= PAS_DMA_RXCHAN_CFG_CTR;
 353
 354         write_dma_reg(PAS_DMA_RXCHAN_CFG(chno), cfg);
 355
 356         write_dma_reg(PAS_DMA_RXINT_BASEL(mac->dma_if),
 357                       PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma));
 358
 359         write_dma_reg(PAS_DMA_RXINT_BASEU(mac->dma_if),
 360                       PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) |
 361                       PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
 362
 363         cfg = PAS_DMA_RXINT_CFG_DHL(2) | PAS_DMA_RXINT_CFG_L2 |
 364               PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP |
 365               PAS_DMA_RXINT_CFG_HEN;
 366
 367         if (translation_enabled())
 368                 cfg |= PAS_DMA_RXINT_CFG_ITRR | PAS_DMA_RXINT_CFG_ITR;
 369
 370         write_dma_reg(PAS_DMA_RXINT_CFG(mac->dma_if), cfg);
 371
 372         ring->next_to_fill = 0;
 373         ring->next_to_clean = 0;
 374         ring->mac = mac;
 375         mac->rx = ring;
 376
 377         return 0;
 378
 379 out_ring_desc:
 380         kfree(ring->ring_info);
 381 out_ring_info:
 382         pasemi_dma_free_chan(&ring->chan);
 383 out_chan:
 384         return -ENOMEM;
 385 }
 386
 387 static struct pasemi_mac_txring *
 388 pasemi_mac_setup_tx_resources(const struct net_device *dev)
 389 {
 390         struct pasemi_mac *mac = netdev_priv(dev);
 391         u32 val;
 392         struct pasemi_mac_txring *ring;
 393         unsigned int cfg;
 394         int chno;
 395
 396         ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_txring),
 397                                      offsetof(struct pasemi_mac_txring, chan));
 398
 399         if (!ring) {
 400                 dev_err(&mac->pdev->dev, "Can't allocate TX channel\n");
 401                 goto out_chan;
 402         }
 403
 404         chno = ring->chan.chno;
 405
 406         spin_lock_init(&ring->lock);
 407
 408         ring->size = TX_RING_SIZE;
 409         ring->ring_info = kzalloc(sizeof(struct pasemi_mac_buffer) *
 410                                   TX_RING_SIZE, GFP_KERNEL);
 411         if (!ring->ring_info)
 412                 goto out_ring_info;
 413
 414         /* Allocate descriptors */
 415         if (pasemi_dma_alloc_ring(&ring->chan, TX_RING_SIZE))
 416                 goto out_ring_desc;
 417
 418         write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
 419                       PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
 420         val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
 421         val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
 422
 423         write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val);
 424
 425         cfg = PAS_DMA_TXCHAN_CFG_TY_IFACE |
 426               PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
 427               PAS_DMA_TXCHAN_CFG_UP |
 428               PAS_DMA_TXCHAN_CFG_WT(2);
 429
 430         if (translation_enabled())
 431                 cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
 432
 433         write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
 434
 435         ring->next_to_fill = 0;
 436         ring->next_to_clean = 0;
 437         ring->mac = mac;
 438
 439         return ring;
 440
 441 out_ring_desc:
 442         kfree(ring->ring_info);
 443 out_ring_info:
 444         pasemi_dma_free_chan(&ring->chan);
 445 out_chan:
 446         return NULL;
 447 }
 448
 449 static void pasemi_mac_free_tx_resources(struct pasemi_mac *mac)
 450 {
 451         struct pasemi_mac_txring *txring = tx_ring(mac);
 452         unsigned int i, j;
 453         struct pasemi_mac_buffer *info;
 454         dma_addr_t dmas[MAX_SKB_FRAGS+1];
 455         int freed, nfrags;
 456         int start, limit;
 457
 458         start = txring->next_to_clean;
 459         limit = txring->next_to_fill;
 460
 461         /* Compensate for when fill has wrapped and clean has not */
 462         if (start > limit)
 463                 limit += TX_RING_SIZE;
 464
 465         for (i = start; i < limit; i += freed) {
 466                 info = &txring->ring_info[(i+1) & (TX_RING_SIZE-1)];
 467                 if (info->dma && info->skb) {
 468                         nfrags = skb_shinfo(info->skb)->nr_frags;
 469                         for (j = 0; j <= nfrags; j++)
 470                                 dmas[j] = txring->ring_info[(i+1+j) &
 471                                                 (TX_RING_SIZE-1)].dma;
 472                         freed = pasemi_mac_unmap_tx_skb(mac, nfrags,
 473                                                         info->skb, dmas);
 474                 } else
 475                         freed = 2;
 476         }
 477
 478         kfree(txring->ring_info);
 479         pasemi_dma_free_chan(&txring->chan);
 480
 481 }
 482
 483 static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac)
 484 {
 485         struct pasemi_mac_rxring *rx = rx_ring(mac);
 486         unsigned int i;
 487         struct pasemi_mac_buffer *info;
 488
 489         for (i = 0; i < RX_RING_SIZE; i++) {
 490                 info = &RX_DESC_INFO(rx, i);
 491                 if (info->skb && info->dma) {
 492                         pci_unmap_single(mac->dma_pdev,
 493                                          info->dma,
 494                                          info->skb->len,
 495                                          PCI_DMA_FROMDEVICE);
 496                         dev_kfree_skb_any(info->skb);
 497                 }
 498                 info->dma = 0;
 499                 info->skb = NULL;
 500         }
 501
 502         for (i = 0; i < RX_RING_SIZE; i++)
 503                 RX_DESC(rx, i) = 0;
 504
 505         dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
 506                           rx_ring(mac)->buffers, rx_ring(mac)->buf_dma);
 507
 508         kfree(rx_ring(mac)->ring_info);
 509         pasemi_dma_free_chan(&rx_ring(mac)->chan);
 510         mac->rx = NULL;
 511 }
 512
 513 static void pasemi_mac_replenish_rx_ring(const struct net_device *dev,
 514                                          const int limit)
 515 {
 516         const struct pasemi_mac *mac = netdev_priv(dev);
 517         struct pasemi_mac_rxring *rx = rx_ring(mac);
 518         int fill, count;
 519
 520         if (limit <= 0)
 521                 return;
 522
 523         fill = rx_ring(mac)->next_to_fill;
 524         for (count = 0; count < limit; count++) {
 525                 struct pasemi_mac_buffer *info = &RX_DESC_INFO(rx, fill);
 526                 u64 *buff = &RX_BUFF(rx, fill);
 527                 struct sk_buff *skb;
 528                 dma_addr_t dma;
 529
 530                 /* Entry in use? */
 531                 WARN_ON(*buff);
 532
 533                 skb = dev_alloc_skb(BUF_SIZE);
 534                 skb_reserve(skb, LOCAL_SKB_ALIGN);
 535
 536                 if (unlikely(!skb))
 537                         break;
 538
 539                 dma = pci_map_single(mac->dma_pdev, skb->data,
 540                                      BUF_SIZE - LOCAL_SKB_ALIGN,
 541                                      PCI_DMA_FROMDEVICE);
 542
 543                 if (unlikely(dma_mapping_error(dma))) {
 544                         dev_kfree_skb_irq(info->skb);
 545                         break;
 546                 }
 547
 548                 info->skb = skb;
 549                 info->dma = dma;
 550                 *buff = XCT_RXB_LEN(BUF_SIZE) | XCT_RXB_ADDR(dma);
 551                 fill++;
 552         }
 553
 554         wmb();
 555
 556         write_dma_reg(PAS_DMA_RXINT_INCR(mac->dma_if), count);
 557
 558         rx_ring(mac)->next_to_fill = (rx_ring(mac)->next_to_fill + count) &
 559                                 (RX_RING_SIZE - 1);
 560 }
 561
 562 static void pasemi_mac_restart_rx_intr(const struct pasemi_mac *mac)
 563 {
 564         struct pasemi_mac_rxring *rx = rx_ring(mac);
 565         unsigned int reg, pcnt;
 566         /* Re-enable packet count interrupts: finally
 567          * ack the packet count interrupt we got in rx_intr.
 568          */
 569
 570         pcnt = *rx->chan.status & PAS_STATUS_PCNT_M;
 571
 572         reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
 573
 574         if (*rx->chan.status & PAS_STATUS_TIMER)
 575                 reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 576
 577         write_iob_reg(PAS_IOB_DMA_RXCH_RESET(mac->rx->chan.chno), reg);
 578 }
 579
 580 static void pasemi_mac_restart_tx_intr(const struct pasemi_mac *mac)
 581 {
 582         unsigned int reg, pcnt;
 583
 584         /* Re-enable packet count interrupts */
 585         pcnt = *tx_ring(mac)->chan.status & PAS_STATUS_PCNT_M;
 586
 587         reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
 588
 589         write_iob_reg(PAS_IOB_DMA_TXCH_RESET(tx_ring(mac)->chan.chno), reg);
 590 }
 591
 592
 593 static inline void pasemi_mac_rx_error(const struct pasemi_mac *mac,
 594                                        const u64 macrx)
 595 {
 596         unsigned int rcmdsta, ccmdsta;
 597         struct pasemi_dmachan *chan = &rx_ring(mac)->chan;
 598
 599         if (!netif_msg_rx_err(mac))
 600                 return;
 601
 602         rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
 603         ccmdsta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno));
 604
 605         printk(KERN_ERR "pasemi_mac: rx error. macrx %016lx, rx status %lx\n",
 606                 macrx, *chan->status);
 607
 608         printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
 609                 rcmdsta, ccmdsta);
 610 }
 611
 612 static inline void pasemi_mac_tx_error(const struct pasemi_mac *mac,
 613                                        const u64 mactx)
 614 {
 615         unsigned int cmdsta;
 616         struct pasemi_dmachan *chan = &tx_ring(mac)->chan;
 617
 618         if (!netif_msg_tx_err(mac))
 619                 return;
 620
 621         cmdsta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno));
 622
 623         printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016lx, "\
 624                 "tx status 0x%016lx\n", mactx, *chan->status);
 625
 626         printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
 627 }
 628
 629 static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx,
 630                                const int limit)
 631 {
 632         const struct pasemi_dmachan *chan = &rx->chan;
 633         struct pasemi_mac *mac = rx->mac;
 634         struct pci_dev *pdev = mac->dma_pdev;
 635         unsigned int n;
 636         int count, buf_index, tot_bytes, packets;
 637         struct pasemi_mac_buffer *info;
 638         struct sk_buff *skb;
 639         unsigned int len;
 640         u64 macrx, eval;
 641         dma_addr_t dma;
 642
 643         tot_bytes = 0;
 644         packets = 0;
 645
 646         spin_lock(&rx->lock);
 647
 648         n = rx->next_to_clean;
 649
 650         prefetch(&RX_DESC(rx, n));
 651
 652         for (count = 0; count < limit; count++) {
 653                 macrx = RX_DESC(rx, n);
 654                 prefetch(&RX_DESC(rx, n+4));
 655
 656                 if ((macrx & XCT_MACRX_E) ||
 657                     (*chan->status & PAS_STATUS_ERROR))
 658                         pasemi_mac_rx_error(mac, macrx);
 659
 660                 if (!(macrx & XCT_MACRX_O))
 661                         break;
 662
 663                 info = NULL;
 664
 665                 BUG_ON(!(macrx & XCT_MACRX_RR_8BRES));
 666
 667                 eval = (RX_DESC(rx, n+1) & XCT_RXRES_8B_EVAL_M) >>
 668                         XCT_RXRES_8B_EVAL_S;
 669                 buf_index = eval-1;
 670
 671                 dma = (RX_DESC(rx, n+2) & XCT_PTR_ADDR_M);
 672                 info = &RX_DESC_INFO(rx, buf_index);
 673
 674                 skb = info->skb;
 675
 676                 prefetch_skb(skb);
 677
 678                 len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 679
 680                 pci_unmap_single(pdev, dma, BUF_SIZE-LOCAL_SKB_ALIGN,
 681                                  PCI_DMA_FROMDEVICE);
 682
 683                 if (macrx & XCT_MACRX_CRC) {
 684                         /* CRC error flagged */
 685                         mac->netdev->stats.rx_errors++;
 686                         mac->netdev->stats.rx_crc_errors++;
 687                         /* No need to free skb, it'll be reused */
 688                         goto next;
 689                 }
 690
 691                 info->skb = NULL;
 692                 info->dma = 0;
 693
 694                 if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
 695                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 696                         skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
 697                                            XCT_MACRX_CSUM_S;
 698                 } else
 699                         skb->ip_summed = CHECKSUM_NONE;
 700
 701                 packets++;
 702                 tot_bytes += len;
 703
 704                 /* Don't include CRC */
 705                 skb_put(skb, len-4);
 706
 707                 skb->protocol = eth_type_trans(skb, mac->netdev);
 708                 lro_receive_skb(&mac->lro_mgr, skb, (void *)macrx);
 709
 710 next:
 711                 RX_DESC(rx, n) = 0;
 712                 RX_DESC(rx, n+1) = 0;
 713
 714                 /* Need to zero it out since hardware doesn't, since the
 715                  * replenish loop uses it to tell when it's done.
 716                  */
 717                 RX_BUFF(rx, buf_index) = 0;
 718
 719                 n += 4;
 720         }
 721
 722         if (n > RX_RING_SIZE) {
 723                 /* Errata 5971 workaround: L2 target of headers */
 724                 write_iob_reg(PAS_IOB_COM_PKTHDRCNT, 0);
 725                 n &= (RX_RING_SIZE-1);
 726         }
 727
 728         rx_ring(mac)->next_to_clean = n;
 729
 730         lro_flush_all(&mac->lro_mgr);
 731
 732         /* Increase is in number of 16-byte entries, and since each descriptor
 733          * with an 8BRES takes up 3x8 bytes (padded to 4x8), increase with
 734          * count*2.
 735          */
 736         write_dma_reg(PAS_DMA_RXCHAN_INCR(mac->rx->chan.chno), count << 1);
 737
 738         pasemi_mac_replenish_rx_ring(mac->netdev, count);
 739
 740         mac->netdev->stats.rx_bytes += tot_bytes;
 741         mac->netdev->stats.rx_packets += packets;
 742
 743         spin_unlock(&rx_ring(mac)->lock);
 744
 745         return count;
 746 }
 747
 748 /* Can't make this too large or we blow the kernel stack limits */
 749 #define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)
 750
 751 static int pasemi_mac_clean_tx(struct pasemi_mac_txring *txring)
 752 {
 753         struct pasemi_dmachan *chan = &txring->chan;
 754         struct pasemi_mac *mac = txring->mac;
 755         int i, j;
 756         unsigned int start, descr_count, buf_count, batch_limit;
 757         unsigned int ring_limit;
 758         unsigned int total_count;
 759         unsigned long flags;
 760         struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
 761         dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];
 762         int nf[TX_CLEAN_BATCHSIZE];
 763         int nr_frags;
 764
 765         total_count = 0;
 766         batch_limit = TX_CLEAN_BATCHSIZE;
 767 restart:
 768         spin_lock_irqsave(&txring->lock, flags);
 769
 770         start = txring->next_to_clean;
 771         ring_limit = txring->next_to_fill;
 772
 773         prefetch(&TX_DESC_INFO(txring, start+1).skb);
 774
 775         /* Compensate for when fill has wrapped but clean has not */
 776         if (start > ring_limit)
 777                 ring_limit += TX_RING_SIZE;
 778
 779         buf_count = 0;
 780         descr_count = 0;
 781
 782         for (i = start;
 783              descr_count < batch_limit && i < ring_limit;
 784              i += buf_count) {
 785                 u64 mactx = TX_DESC(txring, i);
 786                 struct sk_buff *skb;
 787
 788                 skb = TX_DESC_INFO(txring, i+1).skb;
 789                 nr_frags = TX_DESC_INFO(txring, i).dma;
 790
 791                 if ((mactx  & XCT_MACTX_E) ||
 792                     (*chan->status & PAS_STATUS_ERROR))
 793                         pasemi_mac_tx_error(mac, mactx);
 794
 795                 if (unlikely(mactx & XCT_MACTX_O))
 796                         /* Not yet transmitted */
 797                         break;
 798
 799                 buf_count = 2 + nr_frags;
 800                 /* Since we always fill with an even number of entries, make
 801                  * sure we skip any unused one at the end as well.
 802                  */
 803                 if (buf_count & 1)
 804                         buf_count++;
 805
 806                 for (j = 0; j <= nr_frags; j++)
 807                         dmas[descr_count][j] = TX_DESC_INFO(txring, i+1+j).dma;
 808
 809                 skbs[descr_count] = skb;
 810                 nf[descr_count] = nr_frags;
 811
 812                 TX_DESC(txring, i) = 0;
 813                 TX_DESC(txring, i+1) = 0;
 814
 815                 descr_count++;
 816         }
 817         txring->next_to_clean = i & (TX_RING_SIZE-1);
 818
 819         spin_unlock_irqrestore(&txring->lock, flags);
 820         netif_wake_queue(mac->netdev);
 821
 822         for (i = 0; i < descr_count; i++)
 823                 pasemi_mac_unmap_tx_skb(mac, nf[i], skbs[i], dmas[i]);
 824
 825         total_count += descr_count;
 826
 827         /* If the batch was full, try to clean more */
 828         if (descr_count == batch_limit)
 829                 goto restart;
 830
 831         return total_count;
 832 }
 833
 834
 835 static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 836 {
 837         const struct pasemi_mac_rxring *rxring = data;
 838         struct pasemi_mac *mac = rxring->mac;
 839         struct net_device *dev = mac->netdev;
 840         const struct pasemi_dmachan *chan = &rxring->chan;
 841         unsigned int reg;
 842
 843         if (!(*chan->status & PAS_STATUS_CAUSE_M))
 844                 return IRQ_NONE;
 845
 846         /* Don't reset packet count so it won't fire again but clear
 847          * all others.
 848          */
 849
 850         reg = 0;
 851         if (*chan->status & PAS_STATUS_SOFT)
 852                 reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
 853         if (*chan->status & PAS_STATUS_ERROR)
 854                 reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
 855
 856         netif_rx_schedule(dev, &mac->napi);
 857
 858         write_iob_reg(PAS_IOB_DMA_RXCH_RESET(chan->chno), reg);
 859
 860         return IRQ_HANDLED;
 861 }
 862
 863 #define TX_CLEAN_INTERVAL HZ
 864
 865 static void pasemi_mac_tx_timer(unsigned long data)
 866 {
 867         struct pasemi_mac_txring *txring = (struct pasemi_mac_txring *)data;
 868         struct pasemi_mac *mac = txring->mac;
 869
 870         pasemi_mac_clean_tx(txring);
 871
 872         mod_timer(&txring->clean_timer, jiffies + TX_CLEAN_INTERVAL);
 873
 874         pasemi_mac_restart_tx_intr(mac);
 875 }
 876
 877 static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 878 {
 879         struct pasemi_mac_txring *txring = data;
 880         const struct pasemi_dmachan *chan = &txring->chan;
 881         struct pasemi_mac *mac = txring->mac;
 882         unsigned int reg;
 883
 884         if (!(*chan->status & PAS_STATUS_CAUSE_M))
 885                 return IRQ_NONE;
 886
 887         reg = 0;
 888
 889         if (*chan->status & PAS_STATUS_SOFT)
 890                 reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
 891         if (*chan->status & PAS_STATUS_ERROR)
 892                 reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 893
 894         mod_timer(&txring->clean_timer, jiffies + (TX_CLEAN_INTERVAL)*2);
 895
 896         netif_rx_schedule(mac->netdev, &mac->napi);
 897
 898         if (reg)
 899                 write_iob_reg(PAS_IOB_DMA_TXCH_RESET(chan->chno), reg);
 900
 901         return IRQ_HANDLED;
 902 }
 903
 904 static void pasemi_mac_intf_disable(struct pasemi_mac *mac)
 905 {
 906         unsigned int flags;
 907
 908         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 909         flags &= ~PAS_MAC_CFG_PCFG_PE;
 910         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
 911 }
 912
 913 static void pasemi_mac_intf_enable(struct pasemi_mac *mac)
 914 {
 915         unsigned int flags;
 916
 917         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 918         flags |= PAS_MAC_CFG_PCFG_PE;
 919         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
 920 }
 921
 922 static void pasemi_adjust_link(struct net_device *dev)
 923 {
 924         struct pasemi_mac *mac = netdev_priv(dev);
 925         int msg;
 926         unsigned int flags;
 927         unsigned int new_flags;
 928
 929         if (!mac->phydev->link) {
 930                 /* If no link, MAC speed settings don't matter. Just report
 931                  * link down and return.
 932                  */
 933                 if (mac->link && netif_msg_link(mac))
 934                         printk(KERN_INFO "%s: Link is down.\n", dev->name);
 935
 936                 netif_carrier_off(dev);
 937                 pasemi_mac_intf_disable(mac);
 938                 mac->link = 0;
 939
 940                 return;
 941         } else {
 942                 pasemi_mac_intf_enable(mac);
 943                 netif_carrier_on(dev);
 944         }
 945
 946         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 947         new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
 948                               PAS_MAC_CFG_PCFG_TSR_M);
 949
 950         if (!mac->phydev->duplex)
 951                 new_flags |= PAS_MAC_CFG_PCFG_HD;
 952
 953         switch (mac->phydev->speed) {
 954         case 1000:
 955                 new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
 956                              PAS_MAC_CFG_PCFG_TSR_1G;
 957                 break;
 958         case 100:
 959                 new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
 960                              PAS_MAC_CFG_PCFG_TSR_100M;
 961                 break;
 962         case 10:
 963                 new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
 964                              PAS_MAC_CFG_PCFG_TSR_10M;
 965                 break;
 966         default:
 967                 printk("Unsupported speed %d\n", mac->phydev->speed);
 968         }
 969
 970         /* Print on link or speed/duplex change */
 971         msg = mac->link != mac->phydev->link || flags != new_flags;
 972
 973         mac->duplex = mac->phydev->duplex;
 974         mac->speed = mac->phydev->speed;
 975         mac->link = mac->phydev->link;
 976
 977         if (new_flags != flags)
 978                 write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
 979
 980         if (msg && netif_msg_link(mac))
 981                 printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
 982                        dev->name, mac->speed, mac->duplex ? "full" : "half");
 983 }
 984
 985 static int pasemi_mac_phy_init(struct net_device *dev)
 986 {
 987         struct pasemi_mac *mac = netdev_priv(dev);
 988         struct device_node *dn, *phy_dn;
 989         struct phy_device *phydev;
 990         unsigned int phy_id;
 991         const phandle *ph;
 992         const unsigned int *prop;
 993         struct resource r;
 994         int ret;
 995
 996         dn = pci_device_to_OF_node(mac->pdev);
 997         ph = of_get_property(dn, "phy-handle", NULL);
 998         if (!ph)
 999                 return -ENODEV;
1000         phy_dn = of_find_node_by_phandle(*ph);
1001
1002         prop = of_get_property(phy_dn, "reg", NULL);
1003         ret = of_address_to_resource(phy_dn->parent, 0, &r);
1004         if (ret)
1005                 goto err;
1006
1007         phy_id = *prop;
1008         snprintf(mac->phy_id, BUS_ID_SIZE, PHY_ID_FMT, (int)r.start, phy_id);
1009
1010         of_node_put(phy_dn);
1011
1012         mac->link = 0;
1013         mac->speed = 0;
1014         mac->duplex = -1;
1015
1016         phydev = phy_connect(dev, mac->phy_id, &pasemi_adjust_link, 0, PHY_INTERFACE_MODE_SGMII);
1017
1018         if (IS_ERR(phydev)) {
1019                 printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
1020                 return PTR_ERR(phydev);
1021         }
1022
1023         mac->phydev = phydev;
1024
1025         return 0;
1026
1027 err:
1028         of_node_put(phy_dn);
1029         return -ENODEV;
1030 }
1031
1032
1033 static int pasemi_mac_open(struct net_device *dev)
1034 {
1035         struct pasemi_mac *mac = netdev_priv(dev);
1036         unsigned int flags;
1037         int ret;
1038
1039         /* enable rx section */
1040         write_dma_reg(PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
1041
1042         /* enable tx section */
1043         write_dma_reg(PAS_DMA_COM_TXCMD, PAS_DMA_COM_TXCMD_EN);
1044
1045         flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
1046                 PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
1047                 PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
1048
1049         write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
1050
1051         ret = pasemi_mac_setup_rx_resources(dev);
1052         if (ret)
1053                 goto out_rx_resources;
1054
1055         mac->tx = pasemi_mac_setup_tx_resources(dev);
1056
1057         if (!mac->tx)
1058                 goto out_tx_ring;
1059
1060         /* 0x3ff with 33MHz clock is about 31us */
1061         write_iob_reg(PAS_IOB_DMA_COM_TIMEOUTCFG,
1062                       PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0x3ff));
1063
1064         write_iob_reg(PAS_IOB_DMA_RXCH_CFG(mac->rx->chan.chno),
1065                       PAS_IOB_DMA_RXCH_CFG_CNTTH(256));
1066
1067         write_iob_reg(PAS_IOB_DMA_TXCH_CFG(mac->tx->chan.chno),
1068                       PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
1069
1070         write_mac_reg(mac, PAS_MAC_IPC_CHNL,
1071                       PAS_MAC_IPC_CHNL_DCHNO(mac->rx->chan.chno) |
1072                       PAS_MAC_IPC_CHNL_BCH(mac->rx->chan.chno));
1073
1074         /* enable rx if */
1075         write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1076                       PAS_DMA_RXINT_RCMDSTA_EN |
1077                       PAS_DMA_RXINT_RCMDSTA_DROPS_M |
1078                       PAS_DMA_RXINT_RCMDSTA_BP |
1079                       PAS_DMA_RXINT_RCMDSTA_OO |
1080                       PAS_DMA_RXINT_RCMDSTA_BT);
1081
1082         /* enable rx channel */
1083         pasemi_dma_start_chan(&rx_ring(mac)->chan, PAS_DMA_RXCHAN_CCMDSTA_DU |
1084                                                    PAS_DMA_RXCHAN_CCMDSTA_OD |
1085                                                    PAS_DMA_RXCHAN_CCMDSTA_FD |
1086                                                    PAS_DMA_RXCHAN_CCMDSTA_DT);
1087
1088         /* enable tx channel */
1089         pasemi_dma_start_chan(&tx_ring(mac)->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ |
1090                                                    PAS_DMA_TXCHAN_TCMDSTA_DB |
1091                                                    PAS_DMA_TXCHAN_TCMDSTA_DE |
1092                                                    PAS_DMA_TXCHAN_TCMDSTA_DA);
1093
1094         pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
1095
1096         write_dma_reg(PAS_DMA_RXCHAN_INCR(rx_ring(mac)->chan.chno),
1097                       RX_RING_SIZE>>1);
1098
1099         /* Clear out any residual packet count state from firmware */
1100         pasemi_mac_restart_rx_intr(mac);
1101         pasemi_mac_restart_tx_intr(mac);
1102
1103         flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
1104
1105         if (mac->type == MAC_TYPE_GMAC)
1106                 flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
1107         else
1108                 flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
1109
1110         /* Enable interface in MAC */
1111         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1112
1113         ret = pasemi_mac_phy_init(dev);
1114         if (ret) {
1115                 /* Since we won't get link notification, just enable RX */
1116                 pasemi_mac_intf_enable(mac);
1117                 if (mac->type == MAC_TYPE_GMAC) {
1118                         /* Warn for missing PHY on SGMII (1Gig) ports */
1119                         dev_warn(&mac->pdev->dev,
1120                                  "PHY init failed: %d.\n", ret);
1121                         dev_warn(&mac->pdev->dev,
1122                                  "Defaulting to 1Gbit full duplex\n");
1123                 }
1124         }
1125
1126         netif_start_queue(dev);
1127         napi_enable(&mac->napi);
1128
1129         snprintf(mac->tx_irq_name, sizeof(mac->tx_irq_name), "%s tx",
1130                  dev->name);
1131
1132         ret = request_irq(mac->tx->chan.irq, &pasemi_mac_tx_intr, IRQF_DISABLED,
1133                           mac->tx_irq_name, mac->tx);
1134         if (ret) {
1135                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1136                         mac->tx->chan.irq, ret);
1137                 goto out_tx_int;
1138         }
1139
1140         snprintf(mac->rx_irq_name, sizeof(mac->rx_irq_name), "%s rx",
1141                  dev->name);
1142
1143         ret = request_irq(mac->rx->chan.irq, &pasemi_mac_rx_intr, IRQF_DISABLED,
1144                           mac->rx_irq_name, mac->rx);
1145         if (ret) {
1146                 dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1147                         mac->rx->chan.irq, ret);
1148                 goto out_rx_int;
1149         }
1150
1151         if (mac->phydev)
1152                 phy_start(mac->phydev);
1153
1154         init_timer(&mac->tx->clean_timer);
1155         mac->tx->clean_timer.function = pasemi_mac_tx_timer;
1156         mac->tx->clean_timer.data = (unsigned long)mac->tx;
1157         mac->tx->clean_timer.expires = jiffies+HZ;
1158         add_timer(&mac->tx->clean_timer);
1159
1160         return 0;
1161
1162 out_rx_int:
1163         free_irq(mac->tx->chan.irq, mac->tx);
1164 out_tx_int:
1165         napi_disable(&mac->napi);
1166         netif_stop_queue(dev);
1167 out_tx_ring:
1168         if (mac->tx)
1169                 pasemi_mac_free_tx_resources(mac);
1170         pasemi_mac_free_rx_resources(mac);
1171 out_rx_resources:
1172
1173         return ret;
1174 }
1175
1176 #define MAX_RETRIES 5000
1177
1178 static int pasemi_mac_close(struct net_device *dev)
1179 {
1180         struct pasemi_mac *mac = netdev_priv(dev);
1181         unsigned int sta;
1182         int retries;
1183         int rxch, txch;
1184
1185         rxch = rx_ring(mac)->chan.chno;
1186         txch = tx_ring(mac)->chan.chno;
1187
1188         if (mac->phydev) {
1189                 phy_stop(mac->phydev);
1190                 phy_disconnect(mac->phydev);
1191         }
1192
1193         del_timer_sync(&mac->tx->clean_timer);
1194
1195         netif_stop_queue(dev);
1196         napi_disable(&mac->napi);
1197
1198         sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1199         if (sta & (PAS_DMA_RXINT_RCMDSTA_BP |
1200                       PAS_DMA_RXINT_RCMDSTA_OO |
1201                       PAS_DMA_RXINT_RCMDSTA_BT))
1202                 printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta);
1203
1204         sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1205         if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU |
1206                      PAS_DMA_RXCHAN_CCMDSTA_OD |
1207                      PAS_DMA_RXCHAN_CCMDSTA_FD |
1208                      PAS_DMA_RXCHAN_CCMDSTA_DT))
1209                 printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta);
1210
1211         sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch));
1212         if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ | PAS_DMA_TXCHAN_TCMDSTA_DB |
1213                       PAS_DMA_TXCHAN_TCMDSTA_DE | PAS_DMA_TXCHAN_TCMDSTA_DA))
1214                 printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta);
1215
1216         /* Clean out any pending buffers */
1217         pasemi_mac_clean_tx(tx_ring(mac));
1218         pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
1219
1220         /* Disable interface */
1221         write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch),
1222                       PAS_DMA_TXCHAN_TCMDSTA_ST);
1223         write_dma_reg( PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1224                       PAS_DMA_RXINT_RCMDSTA_ST);
1225         write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch),
1226                       PAS_DMA_RXCHAN_CCMDSTA_ST);
1227
1228         for (retries = 0; retries < MAX_RETRIES; retries++) {
1229                 sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(rxch));
1230                 if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT))
1231                         break;
1232                 cond_resched();
1233         }
1234
1235         if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)
1236                 dev_err(&mac->dma_pdev->dev, "Failed to stop tx channel\n");
1237
1238         for (retries = 0; retries < MAX_RETRIES; retries++) {
1239                 sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1240                 if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT))
1241                         break;
1242                 cond_resched();
1243         }
1244
1245         if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)
1246                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx channel\n");
1247
1248         for (retries = 0; retries < MAX_RETRIES; retries++) {
1249                 sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1250                 if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT))
1251                         break;
1252                 cond_resched();
1253         }
1254
1255         if (sta & PAS_DMA_RXINT_RCMDSTA_ACT)
1256                 dev_err(&mac->dma_pdev->dev, "Failed to stop rx interface\n");
1257
1258         /* Then, disable the channel. This must be done separately from
1259          * stopping, since you can't disable when active.
1260          */
1261
1262         write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch), 0);
1263         write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch), 0);
1264         write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
1265
1266         free_irq(mac->tx->chan.irq, mac->tx);
1267         free_irq(mac->rx->chan.irq, mac->rx);
1268
1269         /* Free resources */
1270         pasemi_mac_free_rx_resources(mac);
1271         pasemi_mac_free_tx_resources(mac);
1272
1273         return 0;
1274 }
1275
1276 static int pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
1277 {
1278         struct pasemi_mac *mac = netdev_priv(dev);
1279         struct pasemi_mac_txring *txring;
1280         u64 dflags, mactx;
1281         dma_addr_t map[MAX_SKB_FRAGS+1];
1282         unsigned int map_size[MAX_SKB_FRAGS+1];
1283         unsigned long flags;
1284         int i, nfrags;
1285         int fill;
1286
1287         dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;
1288
1289         if (skb->ip_summed == CHECKSUM_PARTIAL) {
1290                 const unsigned char *nh = skb_network_header(skb);
1291
1292                 switch (ip_hdr(skb)->protocol) {
1293                 case IPPROTO_TCP:
1294                         dflags |= XCT_MACTX_CSUM_TCP;
1295                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1296                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1297                         break;
1298                 case IPPROTO_UDP:
1299                         dflags |= XCT_MACTX_CSUM_UDP;
1300                         dflags |= XCT_MACTX_IPH(skb_network_header_len(skb) >> 2);
1301                         dflags |= XCT_MACTX_IPO(nh - skb->data);
1302                         break;
1303                 }
1304         }
1305
1306         nfrags = skb_shinfo(skb)->nr_frags;
1307
1308         map[0] = pci_map_single(mac->dma_pdev, skb->data, skb_headlen(skb),
1309                                 PCI_DMA_TODEVICE);
1310         map_size[0] = skb_headlen(skb);
1311         if (dma_mapping_error(map[0]))
1312                 goto out_err_nolock;
1313
1314         for (i = 0; i < nfrags; i++) {
1315                 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1316
1317                 map[i+1] = pci_map_page(mac->dma_pdev, frag->page,
1318                                         frag->page_offset, frag->size,
1319                                         PCI_DMA_TODEVICE);
1320                 map_size[i+1] = frag->size;
1321                 if (dma_mapping_error(map[i+1])) {
1322                         nfrags = i;
1323                         goto out_err_nolock;
1324                 }
1325         }
1326
1327         mactx = dflags | XCT_MACTX_LLEN(skb->len);
1328
1329         txring = tx_ring(mac);
1330
1331         spin_lock_irqsave(&txring->lock, flags);
1332
1333         fill = txring->next_to_fill;
1334
1335         /* Avoid stepping on the same cache line that the DMA controller
1336          * is currently about to send, so leave at least 8 words available.
1337          * Total free space needed is mactx + fragments + 8
1338          */
1339         if (RING_AVAIL(txring) < nfrags + 10) {
1340                 /* no room -- stop the queue and wait for tx intr */
1341                 netif_stop_queue(dev);
1342                 goto out_err;
1343         }
1344
1345         TX_DESC(txring, fill) = mactx;
1346         TX_DESC_INFO(txring, fill).dma = nfrags;
1347         fill++;
1348         TX_DESC_INFO(txring, fill).skb = skb;
1349         for (i = 0; i <= nfrags; i++) {
1350                 TX_DESC(txring, fill+i) =
1351                         XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1352                 TX_DESC_INFO(txring, fill+i).dma = map[i];
1353         }
1354
1355         /* We have to add an even number of 8-byte entries to the ring
1356          * even if the last one is unused. That means always an odd number
1357          * of pointers + one mactx descriptor.
1358          */
1359         if (nfrags & 1)
1360                 nfrags++;
1361
1362         txring->next_to_fill = (fill + nfrags + 1) & (TX_RING_SIZE-1);
1363
1364         dev->stats.tx_packets++;
1365         dev->stats.tx_bytes += skb->len;
1366
1367         spin_unlock_irqrestore(&txring->lock, flags);
1368
1369         write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), (nfrags+2) >> 1);
1370
1371         return NETDEV_TX_OK;
1372
1373 out_err:
1374         spin_unlock_irqrestore(&txring->lock, flags);
1375 out_err_nolock:
1376         while (nfrags--)
1377                 pci_unmap_single(mac->dma_pdev, map[nfrags], map_size[nfrags],
1378                                  PCI_DMA_TODEVICE);
1379
1380         return NETDEV_TX_BUSY;
1381 }
1382
1383 static void pasemi_mac_set_rx_mode(struct net_device *dev)
1384 {
1385         const struct pasemi_mac *mac = netdev_priv(dev);
1386         unsigned int flags;
1387
1388         flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1389
1390         /* Set promiscuous */
1391         if (dev->flags & IFF_PROMISC)
1392                 flags |= PAS_MAC_CFG_PCFG_PR;
1393         else
1394                 flags &= ~PAS_MAC_CFG_PCFG_PR;
1395
1396         write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1397 }
1398
1399
1400 static int pasemi_mac_poll(struct napi_struct *napi, int budget)
1401 {
1402         struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
1403         struct net_device *dev = mac->netdev;
1404         int pkts;
1405
1406         pasemi_mac_clean_tx(tx_ring(mac));
1407         pkts = pasemi_mac_clean_rx(rx_ring(mac), budget);
1408         if (pkts < budget) {
1409                 /* all done, no more packets present */
1410                 netif_rx_complete(dev, napi);
1411
1412                 pasemi_mac_restart_rx_intr(mac);
1413                 pasemi_mac_restart_tx_intr(mac);
1414         }
1415         return pkts;
1416 }
1417
1418 static int __devinit
1419 pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1420 {
1421         struct net_device *dev;
1422         struct pasemi_mac *mac;
1423         int err;
1424         DECLARE_MAC_BUF(mac_buf);
1425
1426         err = pci_enable_device(pdev);
1427         if (err)
1428                 return err;
1429
1430         dev = alloc_etherdev(sizeof(struct pasemi_mac));
1431         if (dev == NULL) {
1432                 dev_err(&pdev->dev,
1433                         "pasemi_mac: Could not allocate ethernet device.\n");
1434                 err = -ENOMEM;
1435                 goto out_disable_device;
1436         }
1437
1438         pci_set_drvdata(pdev, dev);
1439         SET_NETDEV_DEV(dev, &pdev->dev);
1440
1441         mac = netdev_priv(dev);
1442
1443         mac->pdev = pdev;
1444         mac->netdev = dev;
1445
1446         netif_napi_add(dev, &mac->napi, pasemi_mac_poll, 64);
1447
1448         dev->features = NETIF_F_IP_CSUM | NETIF_F_LLTX | NETIF_F_SG |
1449                         NETIF_F_HIGHDMA;
1450
1451         mac->lro_mgr.max_aggr = LRO_MAX_AGGR;
1452         mac->lro_mgr.max_desc = MAX_LRO_DESCRIPTORS;
1453         mac->lro_mgr.lro_arr = mac->lro_desc;
1454         mac->lro_mgr.get_skb_header = get_skb_hdr;
1455         mac->lro_mgr.features = LRO_F_NAPI | LRO_F_EXTRACT_VLAN_ID;
1456         mac->lro_mgr.dev = mac->netdev;
1457         mac->lro_mgr.ip_summed = CHECKSUM_UNNECESSARY;
1458         mac->lro_mgr.ip_summed_aggr = CHECKSUM_UNNECESSARY;
1459
1460
1461         mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
1462         if (!mac->dma_pdev) {
1463                 dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
1464                 err = -ENODEV;
1465                 goto out;
1466         }
1467
1468         mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
1469         if (!mac->iob_pdev) {
1470                 dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
1471                 err = -ENODEV;
1472                 goto out;
1473         }
1474
1475         /* get mac addr from device tree */
1476         if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1477                 err = -ENODEV;
1478                 goto out;
1479         }
1480         memcpy(dev->dev_addr, mac->mac_addr, sizeof(mac->mac_addr));
1481
1482         mac->dma_if = mac_to_intf(mac);
1483         if (mac->dma_if < 0) {
1484                 dev_err(&mac->pdev->dev, "Can't map DMA interface\n");
1485                 err = -ENODEV;
1486                 goto out;
1487         }
1488
1489         switch (pdev->device) {
1490         case 0xa005:
1491                 mac->type = MAC_TYPE_GMAC;
1492                 break;
1493         case 0xa006:
1494                 mac->type = MAC_TYPE_XAUI;
1495                 break;
1496         default:
1497                 err = -ENODEV;
1498                 goto out;
1499         }
1500
1501         dev->open = pasemi_mac_open;
1502         dev->stop = pasemi_mac_close;
1503         dev->hard_start_xmit = pasemi_mac_start_tx;
1504         dev->set_multicast_list = pasemi_mac_set_rx_mode;
1505         dev->set_mac_address = pasemi_mac_set_mac_addr;
1506
1507         if (err)
1508                 goto out;
1509
1510         mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1511
1512         /* Enable most messages by default */
1513         mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
1514
1515         err = register_netdev(dev);
1516
1517         if (err) {
1518                 dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1519                         err);
1520                 goto out;
1521         } else if netif_msg_probe(mac)
1522                 printk(KERN_INFO "%s: PA Semi %s: intf %d, hw addr %s\n",
1523                        dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1524                        mac->dma_if, print_mac(mac_buf, dev->dev_addr));
1525
1526         return err;
1527
1528 out:
1529         if (mac->iob_pdev)
1530                 pci_dev_put(mac->iob_pdev);
1531         if (mac->dma_pdev)
1532                 pci_dev_put(mac->dma_pdev);
1533
1534         free_netdev(dev);
1535 out_disable_device:
1536         pci_disable_device(pdev);
1537         return err;
1538
1539 }
1540
1541 static void __devexit pasemi_mac_remove(struct pci_dev *pdev)
1542 {
1543         struct net_device *netdev = pci_get_drvdata(pdev);
1544         struct pasemi_mac *mac;
1545
1546         if (!netdev)
1547                 return;
1548
1549         mac = netdev_priv(netdev);
1550
1551         unregister_netdev(netdev);
1552
1553         pci_disable_device(pdev);
1554         pci_dev_put(mac->dma_pdev);
1555         pci_dev_put(mac->iob_pdev);
1556
1557         pasemi_dma_free_chan(&mac->tx->chan);
1558         pasemi_dma_free_chan(&mac->rx->chan);
1559
1560         pci_set_drvdata(pdev, NULL);
1561         free_netdev(netdev);
1562 }
1563
1564 static struct pci_device_id pasemi_mac_pci_tbl[] = {
1565         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1566         { PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1567         { },
1568 };
1569
1570 MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1571
1572 static struct pci_driver pasemi_mac_driver = {
1573         .name           = "pasemi_mac",
1574         .id_table       = pasemi_mac_pci_tbl,
1575         .probe          = pasemi_mac_probe,
1576         .remove         = __devexit_p(pasemi_mac_remove),
1577 };
1578
1579 static void __exit pasemi_mac_cleanup_module(void)
1580 {
1581         pci_unregister_driver(&pasemi_mac_driver);
1582 }
1583
1584 int pasemi_mac_init_module(void)
1585 {
1586         int err;
1587
1588         err = pasemi_dma_init();
1589         if (err)
1590                 return err;
1591
1592         return pci_register_driver(&pasemi_mac_driver);
1593 }
1594
1595 module_init(pasemi_mac_init_module);
1596 module_exit(pasemi_mac_cleanup_module);