drivers/net/ll_temac_main.c

   1 /*
   2  * Driver for Xilinx TEMAC Ethernet device
   3  *
   4  * Copyright (c) 2008 Nissin Systems Co., Ltd.,  Yoshio Kashiwagi
   5  * Copyright (c) 2005-2008 DLA Systems,  David H. Lynch Jr. <dhlii@dlasys.net>
   6  * Copyright (c) 2008-2009 Secret Lab Technologies Ltd.
   7  *
   8  * This is a driver for the Xilinx ll_temac ipcore which is often used
   9  * in the Virtex and Spartan series of chips.
  10  *
  11  * Notes:
  12  * - The ll_temac hardware uses indirect access for many of the TEMAC
  13  *   registers, include the MDIO bus.  However, indirect access to MDIO
  14  *   registers take considerably more clock cycles than to TEMAC registers.
  15  *   MDIO accesses are long, so threads doing them should probably sleep
  16  *   rather than busywait.  However, since only one indirect access can be
  17  *   in progress at any given time, that means that *all* indirect accesses
  18  *   could end up sleeping (to wait for an MDIO access to complete).
  19  *   Fortunately none of the indirect accesses are on the 'hot' path for tx
  20  *   or rx, so this should be okay.
  21  *
  22  * TODO:
  23  * - Fix driver to work on more than just Virtex5.  Right now the driver
  24  *   assumes that the locallink DMA registers are accessed via DCR
  25  *   instructions.
  26  * - Factor out locallink DMA code into separate driver
  27  * - Fix multicast assignment.
  28  * - Fix support for hardware checksumming.
  29  * - Testing.  Lots and lots of testing.
  30  *
  31  */
  32
  33 #include <linux/delay.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/init.h>
  36 #include <linux/mii.h>
  37 #include <linux/module.h>
  38 #include <linux/mutex.h>
  39 #include <linux/netdevice.h>
  40 #include <linux/of.h>
  41 #include <linux/of_device.h>
  42 #include <linux/of_mdio.h>
  43 #include <linux/of_platform.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/spinlock.h>
  46 #include <linux/tcp.h>      /* needed for sizeof(tcphdr) */
  47 #include <linux/udp.h>      /* needed for sizeof(udphdr) */
  48 #include <linux/phy.h>
  49 #include <linux/in.h>
  50 #include <linux/io.h>
  51 #include <linux/ip.h>
  52
  53 #include "ll_temac.h"
  54
  55 #define TX_BD_NUM   64
  56 #define RX_BD_NUM   128
  57
  58 /* ---------------------------------------------------------------------
  59  * Low level register access functions
  60  */
  61
  62 u32 temac_ior(struct temac_local *lp, int offset)
  63 {
  64         return in_be32((u32 *)(lp->regs + offset));
  65 }
  66
  67 void temac_iow(struct temac_local *lp, int offset, u32 value)
  68 {
  69         out_be32((u32 *) (lp->regs + offset), value);
  70 }
  71
  72 int temac_indirect_busywait(struct temac_local *lp)
  73 {
  74         long end = jiffies + 2;
  75
  76         while (!(temac_ior(lp, XTE_RDY0_OFFSET) & XTE_RDY0_HARD_ACS_RDY_MASK)) {
  77                 if (end - jiffies <= 0) {
  78                         WARN_ON(1);
  79                         return -ETIMEDOUT;
  80                 }
  81                 msleep(1);
  82         }
  83         return 0;
  84 }
  85
  86 /**
  87  * temac_indirect_in32
  88  *
  89  * lp->indirect_mutex must be held when calling this function
  90  */
  91 u32 temac_indirect_in32(struct temac_local *lp, int reg)
  92 {
  93         u32 val;
  94
  95         if (temac_indirect_busywait(lp))
  96                 return -ETIMEDOUT;
  97         temac_iow(lp, XTE_CTL0_OFFSET, reg);
  98         if (temac_indirect_busywait(lp))
  99                 return -ETIMEDOUT;
 100         val = temac_ior(lp, XTE_LSW0_OFFSET);
 101
 102         return val;
 103 }
 104
 105 /**
 106  * temac_indirect_out32
 107  *
 108  * lp->indirect_mutex must be held when calling this function
 109  */
 110 void temac_indirect_out32(struct temac_local *lp, int reg, u32 value)
 111 {
 112         if (temac_indirect_busywait(lp))
 113                 return;
 114         temac_iow(lp, XTE_LSW0_OFFSET, value);
 115         temac_iow(lp, XTE_CTL0_OFFSET, CNTLREG_WRITE_ENABLE_MASK | reg);
 116 }
 117
 118 static u32 temac_dma_in32(struct temac_local *lp, int reg)
 119 {
 120         return dcr_read(lp->sdma_dcrs, reg);
 121 }
 122
 123 static void temac_dma_out32(struct temac_local *lp, int reg, u32 value)
 124 {
 125         dcr_write(lp->sdma_dcrs, reg, value);
 126 }
 127
 128 /**
 129  * temac_dma_bd_init - Setup buffer descriptor rings
 130  */
 131 static int temac_dma_bd_init(struct net_device *ndev)
 132 {
 133         struct temac_local *lp = netdev_priv(ndev);
 134         struct sk_buff *skb;
 135         int i;
 136
 137         lp->rx_skb = kzalloc(sizeof(*lp->rx_skb) * RX_BD_NUM, GFP_KERNEL);
 138         /* allocate the tx and rx ring buffer descriptors. */
 139         /* returns a virtual addres and a physical address. */
 140         lp->tx_bd_v = dma_alloc_coherent(ndev->dev.parent,
 141                                          sizeof(*lp->tx_bd_v) * TX_BD_NUM,
 142                                          &lp->tx_bd_p, GFP_KERNEL);
 143         lp->rx_bd_v = dma_alloc_coherent(ndev->dev.parent,
 144                                          sizeof(*lp->rx_bd_v) * RX_BD_NUM,
 145                                          &lp->rx_bd_p, GFP_KERNEL);
 146
 147         memset(lp->tx_bd_v, 0, sizeof(*lp->tx_bd_v) * TX_BD_NUM);
 148         for (i = 0; i < TX_BD_NUM; i++) {
 149                 lp->tx_bd_v[i].next = lp->tx_bd_p +
 150                                 sizeof(*lp->tx_bd_v) * ((i + 1) % TX_BD_NUM);
 151         }
 152
 153         memset(lp->rx_bd_v, 0, sizeof(*lp->rx_bd_v) * RX_BD_NUM);
 154         for (i = 0; i < RX_BD_NUM; i++) {
 155                 lp->rx_bd_v[i].next = lp->rx_bd_p +
 156                                 sizeof(*lp->rx_bd_v) * ((i + 1) % RX_BD_NUM);
 157
 158                 skb = alloc_skb(XTE_MAX_JUMBO_FRAME_SIZE
 159                                 + XTE_ALIGN, GFP_ATOMIC);
 160                 if (skb == 0) {
 161                         dev_err(&ndev->dev, "alloc_skb error %d\n", i);
 162                         return -1;
 163                 }
 164                 lp->rx_skb[i] = skb;
 165                 skb_reserve(skb,  BUFFER_ALIGN(skb->data));
 166                 /* returns physical address of skb->data */
 167                 lp->rx_bd_v[i].phys = dma_map_single(ndev->dev.parent,
 168                                                      skb->data,
 169                                                      XTE_MAX_JUMBO_FRAME_SIZE,
 170                                                      DMA_FROM_DEVICE);
 171                 lp->rx_bd_v[i].len = XTE_MAX_JUMBO_FRAME_SIZE;
 172                 lp->rx_bd_v[i].app0 = STS_CTRL_APP0_IRQONEND;
 173         }
 174
 175         temac_dma_out32(lp, TX_CHNL_CTRL, 0x10220400 |
 176                                           CHNL_CTRL_IRQ_EN |
 177                                           CHNL_CTRL_IRQ_DLY_EN |
 178                                           CHNL_CTRL_IRQ_COAL_EN);
 179         /* 0x10220483 */
 180         /* 0x00100483 */
 181         temac_dma_out32(lp, RX_CHNL_CTRL, 0xff010000 |
 182                                           CHNL_CTRL_IRQ_EN |
 183                                           CHNL_CTRL_IRQ_DLY_EN |
 184                                           CHNL_CTRL_IRQ_COAL_EN |
 185                                           CHNL_CTRL_IRQ_IOE);
 186         /* 0xff010283 */
 187
 188         temac_dma_out32(lp, RX_CURDESC_PTR,  lp->rx_bd_p);
 189         temac_dma_out32(lp, RX_TAILDESC_PTR,
 190                        lp->rx_bd_p + (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1)));
 191         temac_dma_out32(lp, TX_CURDESC_PTR, lp->tx_bd_p);
 192
 193         return 0;
 194 }
 195
 196 /* ---------------------------------------------------------------------
 197  * net_device_ops
 198  */
 199
 200 static int temac_set_mac_address(struct net_device *ndev, void *address)
 201 {
 202         struct temac_local *lp = netdev_priv(ndev);
 203
 204         if (address)
 205                 memcpy(ndev->dev_addr, address, ETH_ALEN);
 206
 207         if (!is_valid_ether_addr(ndev->dev_addr))
 208                 random_ether_addr(ndev->dev_addr);
 209
 210         /* set up unicast MAC address filter set its mac address */
 211         mutex_lock(&lp->indirect_mutex);
 212         temac_indirect_out32(lp, XTE_UAW0_OFFSET,
 213                              (ndev->dev_addr[0]) |
 214                              (ndev->dev_addr[1] << 8) |
 215                              (ndev->dev_addr[2] << 16) |
 216                              (ndev->dev_addr[3] << 24));
 217         /* There are reserved bits in EUAW1
 218          * so don't affect them Set MAC bits [47:32] in EUAW1 */
 219         temac_indirect_out32(lp, XTE_UAW1_OFFSET,
 220                              (ndev->dev_addr[4] & 0x000000ff) |
 221                              (ndev->dev_addr[5] << 8));
 222         mutex_unlock(&lp->indirect_mutex);
 223
 224         return 0;
 225 }
 226
 227 static void temac_set_multicast_list(struct net_device *ndev)
 228 {
 229         struct temac_local *lp = netdev_priv(ndev);
 230         u32 multi_addr_msw, multi_addr_lsw, val;
 231         int i;
 232
 233         mutex_lock(&lp->indirect_mutex);
 234         if (ndev->flags & (IFF_ALLMULTI | IFF_PROMISC) ||
 235             ndev->mc_count > MULTICAST_CAM_TABLE_NUM) {
 236                 /*
 237                  *      We must make the kernel realise we had to move
 238                  *      into promisc mode or we start all out war on
 239                  *      the cable. If it was a promisc request the
 240                  *      flag is already set. If not we assert it.
 241                  */
 242                 ndev->flags |= IFF_PROMISC;
 243                 temac_indirect_out32(lp, XTE_AFM_OFFSET, XTE_AFM_EPPRM_MASK);
 244                 dev_info(&ndev->dev, "Promiscuous mode enabled.\n");
 245         } else if (ndev->mc_count) {
 246                 struct dev_mc_list *mclist = ndev->mc_list;
 247                 for (i = 0; mclist && i < ndev->mc_count; i++) {
 248
 249                         if (i >= MULTICAST_CAM_TABLE_NUM)
 250                                 break;
 251                         multi_addr_msw = ((mclist->dmi_addr[3] << 24) |
 252                                           (mclist->dmi_addr[2] << 16) |
 253                                           (mclist->dmi_addr[1] << 8) |
 254                                           (mclist->dmi_addr[0]));
 255                         temac_indirect_out32(lp, XTE_MAW0_OFFSET,
 256                                              multi_addr_msw);
 257                         multi_addr_lsw = ((mclist->dmi_addr[5] << 8) |
 258                                           (mclist->dmi_addr[4]) | (i << 16));
 259                         temac_indirect_out32(lp, XTE_MAW1_OFFSET,
 260                                              multi_addr_lsw);
 261                         mclist = mclist->next;
 262                 }
 263         } else {
 264                 val = temac_indirect_in32(lp, XTE_AFM_OFFSET);
 265                 temac_indirect_out32(lp, XTE_AFM_OFFSET,
 266                                      val & ~XTE_AFM_EPPRM_MASK);
 267                 temac_indirect_out32(lp, XTE_MAW0_OFFSET, 0);
 268                 temac_indirect_out32(lp, XTE_MAW1_OFFSET, 0);
 269                 dev_info(&ndev->dev, "Promiscuous mode disabled.\n");
 270         }
 271         mutex_unlock(&lp->indirect_mutex);
 272 }
 273
 274 struct temac_option {
 275         int flg;
 276         u32 opt;
 277         u32 reg;
 278         u32 m_or;
 279         u32 m_and;
 280 } temac_options[] = {
 281         /* Turn on jumbo packet support for both Rx and Tx */
 282         {
 283                 .opt = XTE_OPTION_JUMBO,
 284                 .reg = XTE_TXC_OFFSET,
 285                 .m_or = XTE_TXC_TXJMBO_MASK,
 286         },
 287         {
 288                 .opt = XTE_OPTION_JUMBO,
 289                 .reg = XTE_RXC1_OFFSET,
 290                 .m_or =XTE_RXC1_RXJMBO_MASK,
 291         },
 292         /* Turn on VLAN packet support for both Rx and Tx */
 293         {
 294                 .opt = XTE_OPTION_VLAN,
 295                 .reg = XTE_TXC_OFFSET,
 296                 .m_or =XTE_TXC_TXVLAN_MASK,
 297         },
 298         {
 299                 .opt = XTE_OPTION_VLAN,
 300                 .reg = XTE_RXC1_OFFSET,
 301                 .m_or =XTE_RXC1_RXVLAN_MASK,
 302         },
 303         /* Turn on FCS stripping on receive packets */
 304         {
 305                 .opt = XTE_OPTION_FCS_STRIP,
 306                 .reg = XTE_RXC1_OFFSET,
 307                 .m_or =XTE_RXC1_RXFCS_MASK,
 308         },
 309         /* Turn on FCS insertion on transmit packets */
 310         {
 311                 .opt = XTE_OPTION_FCS_INSERT,
 312                 .reg = XTE_TXC_OFFSET,
 313                 .m_or =XTE_TXC_TXFCS_MASK,
 314         },
 315         /* Turn on length/type field checking on receive packets */
 316         {
 317                 .opt = XTE_OPTION_LENTYPE_ERR,
 318                 .reg = XTE_RXC1_OFFSET,
 319                 .m_or =XTE_RXC1_RXLT_MASK,
 320         },
 321         /* Turn on flow control */
 322         {
 323                 .opt = XTE_OPTION_FLOW_CONTROL,
 324                 .reg = XTE_FCC_OFFSET,
 325                 .m_or =XTE_FCC_RXFLO_MASK,
 326         },
 327         /* Turn on flow control */
 328         {
 329                 .opt = XTE_OPTION_FLOW_CONTROL,
 330                 .reg = XTE_FCC_OFFSET,
 331                 .m_or =XTE_FCC_TXFLO_MASK,
 332         },
 333         /* Turn on promiscuous frame filtering (all frames are received ) */
 334         {
 335                 .opt = XTE_OPTION_PROMISC,
 336                 .reg = XTE_AFM_OFFSET,
 337                 .m_or =XTE_AFM_EPPRM_MASK,
 338         },
 339         /* Enable transmitter if not already enabled */
 340         {
 341                 .opt = XTE_OPTION_TXEN,
 342                 .reg = XTE_TXC_OFFSET,
 343                 .m_or =XTE_TXC_TXEN_MASK,
 344         },
 345         /* Enable receiver? */
 346         {
 347                 .opt = XTE_OPTION_RXEN,
 348                 .reg = XTE_RXC1_OFFSET,
 349                 .m_or =XTE_RXC1_RXEN_MASK,
 350         },
 351         {}
 352 };
 353
 354 /**
 355  * temac_setoptions
 356  */
 357 static u32 temac_setoptions(struct net_device *ndev, u32 options)
 358 {
 359         struct temac_local *lp = netdev_priv(ndev);
 360         struct temac_option *tp = &temac_options[0];
 361         int reg;
 362
 363         mutex_lock(&lp->indirect_mutex);
 364         while (tp->opt) {
 365                 reg = temac_indirect_in32(lp, tp->reg) & ~tp->m_or;
 366                 if (options & tp->opt)
 367                         reg |= tp->m_or;
 368                 temac_indirect_out32(lp, tp->reg, reg);
 369                 tp++;
 370         }
 371         lp->options |= options;
 372         mutex_unlock(&lp->indirect_mutex);
 373
 374         return (0);
 375 }
 376
 377 /* Initilize temac */
 378 static void temac_device_reset(struct net_device *ndev)
 379 {
 380         struct temac_local *lp = netdev_priv(ndev);
 381         u32 timeout;
 382         u32 val;
 383
 384         /* Perform a software reset */
 385
 386         /* 0x300 host enable bit ? */
 387         /* reset PHY through control register ?:1 */
 388
 389         dev_dbg(&ndev->dev, "%s()\n", __func__);
 390
 391         mutex_lock(&lp->indirect_mutex);
 392         /* Reset the receiver and wait for it to finish reset */
 393         temac_indirect_out32(lp, XTE_RXC1_OFFSET, XTE_RXC1_RXRST_MASK);
 394         timeout = 1000;
 395         while (temac_indirect_in32(lp, XTE_RXC1_OFFSET) & XTE_RXC1_RXRST_MASK) {
 396                 udelay(1);
 397                 if (--timeout == 0) {
 398                         dev_err(&ndev->dev,
 399                                 "temac_device_reset RX reset timeout!!\n");
 400                         break;
 401                 }
 402         }
 403
 404         /* Reset the transmitter and wait for it to finish reset */
 405         temac_indirect_out32(lp, XTE_TXC_OFFSET, XTE_TXC_TXRST_MASK);
 406         timeout = 1000;
 407         while (temac_indirect_in32(lp, XTE_TXC_OFFSET) & XTE_TXC_TXRST_MASK) {
 408                 udelay(1);
 409                 if (--timeout == 0) {
 410                         dev_err(&ndev->dev,
 411                                 "temac_device_reset TX reset timeout!!\n");
 412                         break;
 413                 }
 414         }
 415
 416         /* Disable the receiver */
 417         val = temac_indirect_in32(lp, XTE_RXC1_OFFSET);
 418         temac_indirect_out32(lp, XTE_RXC1_OFFSET, val & ~XTE_RXC1_RXEN_MASK);
 419
 420         /* Reset Local Link (DMA) */
 421         temac_dma_out32(lp, DMA_CONTROL_REG, DMA_CONTROL_RST);
 422         timeout = 1000;
 423         while (temac_dma_in32(lp, DMA_CONTROL_REG) & DMA_CONTROL_RST) {
 424                 udelay(1);
 425                 if (--timeout == 0) {
 426                         dev_err(&ndev->dev,
 427                                 "temac_device_reset DMA reset timeout!!\n");
 428                         break;
 429                 }
 430         }
 431         temac_dma_out32(lp, DMA_CONTROL_REG, DMA_TAIL_ENABLE);
 432
 433         temac_dma_bd_init(ndev);
 434
 435         temac_indirect_out32(lp, XTE_RXC0_OFFSET, 0);
 436         temac_indirect_out32(lp, XTE_RXC1_OFFSET, 0);
 437         temac_indirect_out32(lp, XTE_TXC_OFFSET, 0);
 438         temac_indirect_out32(lp, XTE_FCC_OFFSET, XTE_FCC_RXFLO_MASK);
 439
 440         mutex_unlock(&lp->indirect_mutex);
 441
 442         /* Sync default options with HW
 443          * but leave receiver and transmitter disabled.  */
 444         temac_setoptions(ndev,
 445                          lp->options & ~(XTE_OPTION_TXEN | XTE_OPTION_RXEN));
 446
 447         temac_set_mac_address(ndev, NULL);
 448
 449         /* Set address filter table */
 450         temac_set_multicast_list(ndev);
 451         if (temac_setoptions(ndev, lp->options))
 452                 dev_err(&ndev->dev, "Error setting TEMAC options\n");
 453
 454         /* Init Driver variable */
 455         ndev->trans_start = 0;
 456 }
 457
 458 void temac_adjust_link(struct net_device *ndev)
 459 {
 460         struct temac_local *lp = netdev_priv(ndev);
 461         struct phy_device *phy = lp->phy_dev;
 462         u32 mii_speed;
 463         int link_state;
 464
 465         /* hash together the state values to decide if something has changed */
 466         link_state = phy->speed | (phy->duplex << 1) | phy->link;
 467
 468         mutex_lock(&lp->indirect_mutex);
 469         if (lp->last_link != link_state) {
 470                 mii_speed = temac_indirect_in32(lp, XTE_EMCFG_OFFSET);
 471                 mii_speed &= ~XTE_EMCFG_LINKSPD_MASK;
 472
 473                 switch (phy->speed) {
 474                 case SPEED_1000: mii_speed |= XTE_EMCFG_LINKSPD_1000; break;
 475                 case SPEED_100: mii_speed |= XTE_EMCFG_LINKSPD_100; break;
 476                 case SPEED_10: mii_speed |= XTE_EMCFG_LINKSPD_10; break;
 477                 }
 478
 479                 /* Write new speed setting out to TEMAC */
 480                 temac_indirect_out32(lp, XTE_EMCFG_OFFSET, mii_speed);
 481                 lp->last_link = link_state;
 482                 phy_print_status(phy);
 483         }
 484         mutex_unlock(&lp->indirect_mutex);
 485 }
 486
 487 static void temac_start_xmit_done(struct net_device *ndev)
 488 {
 489         struct temac_local *lp = netdev_priv(ndev);
 490         struct cdmac_bd *cur_p;
 491         unsigned int stat = 0;
 492
 493         cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
 494         stat = cur_p->app0;
 495
 496         while (stat & STS_CTRL_APP0_CMPLT) {
 497                 dma_unmap_single(ndev->dev.parent, cur_p->phys, cur_p->len,
 498                                  DMA_TO_DEVICE);
 499                 if (cur_p->app4)
 500                         dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
 501                 cur_p->app0 = 0;
 502
 503                 ndev->stats.tx_packets++;
 504                 ndev->stats.tx_bytes += cur_p->len;
 505
 506                 lp->tx_bd_ci++;
 507                 if (lp->tx_bd_ci >= TX_BD_NUM)
 508                         lp->tx_bd_ci = 0;
 509
 510                 cur_p = &lp->tx_bd_v[lp->tx_bd_ci];
 511                 stat = cur_p->app0;
 512         }
 513
 514         netif_wake_queue(ndev);
 515 }
 516
 517 static int temac_start_xmit(struct sk_buff *skb, struct net_device *ndev)
 518 {
 519         struct temac_local *lp = netdev_priv(ndev);
 520         struct cdmac_bd *cur_p;
 521         dma_addr_t start_p, tail_p;
 522         int ii;
 523         unsigned long num_frag;
 524         skb_frag_t *frag;
 525
 526         num_frag = skb_shinfo(skb)->nr_frags;
 527         frag = &skb_shinfo(skb)->frags[0];
 528         start_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
 529         cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
 530
 531         if (cur_p->app0 & STS_CTRL_APP0_CMPLT) {
 532                 if (!netif_queue_stopped(ndev)) {
 533                         netif_stop_queue(ndev);
 534                         return NETDEV_TX_BUSY;
 535                 }
 536                 return NETDEV_TX_BUSY;
 537         }
 538
 539         cur_p->app0 = 0;
 540         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 541                 const struct iphdr *ip = ip_hdr(skb);
 542                 int length = 0, start = 0, insert = 0;
 543
 544                 switch (ip->protocol) {
 545                 case IPPROTO_TCP:
 546                         start = sizeof(struct iphdr) + ETH_HLEN;
 547                         insert = sizeof(struct iphdr) + ETH_HLEN + 16;
 548                         length = ip->tot_len - sizeof(struct iphdr);
 549                         break;
 550                 case IPPROTO_UDP:
 551                         start = sizeof(struct iphdr) + ETH_HLEN;
 552                         insert = sizeof(struct iphdr) + ETH_HLEN + 6;
 553                         length = ip->tot_len - sizeof(struct iphdr);
 554                         break;
 555                 default:
 556                         break;
 557                 }
 558                 cur_p->app1 = ((start << 16) | insert);
 559                 cur_p->app2 = csum_tcpudp_magic(ip->saddr, ip->daddr,
 560                                                 length, ip->protocol, 0);
 561                 skb->data[insert] = 0;
 562                 skb->data[insert + 1] = 0;
 563         }
 564         cur_p->app0 |= STS_CTRL_APP0_SOP;
 565         cur_p->len = skb_headlen(skb);
 566         cur_p->phys = dma_map_single(ndev->dev.parent, skb->data, skb->len,
 567                                      DMA_TO_DEVICE);
 568         cur_p->app4 = (unsigned long)skb;
 569
 570         for (ii = 0; ii < num_frag; ii++) {
 571                 lp->tx_bd_tail++;
 572                 if (lp->tx_bd_tail >= TX_BD_NUM)
 573                         lp->tx_bd_tail = 0;
 574
 575                 cur_p = &lp->tx_bd_v[lp->tx_bd_tail];
 576                 cur_p->phys = dma_map_single(ndev->dev.parent,
 577                                              (void *)page_address(frag->page) +
 578                                                   frag->page_offset,
 579                                              frag->size, DMA_TO_DEVICE);
 580                 cur_p->len = frag->size;
 581                 cur_p->app0 = 0;
 582                 frag++;
 583         }
 584         cur_p->app0 |= STS_CTRL_APP0_EOP;
 585
 586         tail_p = lp->tx_bd_p + sizeof(*lp->tx_bd_v) * lp->tx_bd_tail;
 587         lp->tx_bd_tail++;
 588         if (lp->tx_bd_tail >= TX_BD_NUM)
 589                 lp->tx_bd_tail = 0;
 590
 591         /* Kick off the transfer */
 592         temac_dma_out32(lp, TX_TAILDESC_PTR, tail_p); /* DMA start */
 593
 594         return NETDEV_TX_OK;
 595 }
 596
 597
 598 static void ll_temac_recv(struct net_device *ndev)
 599 {
 600         struct temac_local *lp = netdev_priv(ndev);
 601         struct sk_buff *skb, *new_skb;
 602         unsigned int bdstat;
 603         struct cdmac_bd *cur_p;
 604         dma_addr_t tail_p;
 605         int length;
 606         unsigned long skb_vaddr;
 607         unsigned long flags;
 608
 609         spin_lock_irqsave(&lp->rx_lock, flags);
 610
 611         tail_p = lp->rx_bd_p + sizeof(*lp->rx_bd_v) * lp->rx_bd_ci;
 612         cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
 613
 614         bdstat = cur_p->app0;
 615         while ((bdstat & STS_CTRL_APP0_CMPLT)) {
 616
 617                 skb = lp->rx_skb[lp->rx_bd_ci];
 618                 length = cur_p->app4;
 619
 620                 skb_vaddr = virt_to_bus(skb->data);
 621                 dma_unmap_single(ndev->dev.parent, skb_vaddr, length,
 622                                  DMA_FROM_DEVICE);
 623
 624                 skb_put(skb, length);
 625                 skb->dev = ndev;
 626                 skb->protocol = eth_type_trans(skb, ndev);
 627                 skb->ip_summed = CHECKSUM_NONE;
 628
 629                 netif_rx(skb);
 630
 631                 ndev->stats.rx_packets++;
 632                 ndev->stats.rx_bytes += length;
 633
 634                 new_skb = alloc_skb(XTE_MAX_JUMBO_FRAME_SIZE + XTE_ALIGN,
 635                                 GFP_ATOMIC);
 636                 if (new_skb == 0) {
 637                         dev_err(&ndev->dev, "no memory for new sk_buff\n");
 638                         spin_unlock_irqrestore(&lp->rx_lock, flags);
 639                         return;
 640                 }
 641
 642                 skb_reserve(new_skb, BUFFER_ALIGN(new_skb->data));
 643
 644                 cur_p->app0 = STS_CTRL_APP0_IRQONEND;
 645                 cur_p->phys = dma_map_single(ndev->dev.parent, new_skb->data,
 646                                              XTE_MAX_JUMBO_FRAME_SIZE,
 647                                              DMA_FROM_DEVICE);
 648                 cur_p->len = XTE_MAX_JUMBO_FRAME_SIZE;
 649                 lp->rx_skb[lp->rx_bd_ci] = new_skb;
 650
 651                 lp->rx_bd_ci++;
 652                 if (lp->rx_bd_ci >= RX_BD_NUM)
 653                         lp->rx_bd_ci = 0;
 654
 655                 cur_p = &lp->rx_bd_v[lp->rx_bd_ci];
 656                 bdstat = cur_p->app0;
 657         }
 658         temac_dma_out32(lp, RX_TAILDESC_PTR, tail_p);
 659
 660         spin_unlock_irqrestore(&lp->rx_lock, flags);
 661 }
 662
 663 static irqreturn_t ll_temac_tx_irq(int irq, void *_ndev)
 664 {
 665         struct net_device *ndev = _ndev;
 666         struct temac_local *lp = netdev_priv(ndev);
 667         unsigned int status;
 668
 669         status = temac_dma_in32(lp, TX_IRQ_REG);
 670         temac_dma_out32(lp, TX_IRQ_REG, status);
 671
 672         if (status & (IRQ_COAL | IRQ_DLY))
 673                 temac_start_xmit_done(lp->ndev);
 674         if (status & 0x080)
 675                 dev_err(&ndev->dev, "DMA error 0x%x\n", status);
 676
 677         return IRQ_HANDLED;
 678 }
 679
 680 static irqreturn_t ll_temac_rx_irq(int irq, void *_ndev)
 681 {
 682         struct net_device *ndev = _ndev;
 683         struct temac_local *lp = netdev_priv(ndev);
 684         unsigned int status;
 685
 686         /* Read and clear the status registers */
 687         status = temac_dma_in32(lp, RX_IRQ_REG);
 688         temac_dma_out32(lp, RX_IRQ_REG, status);
 689
 690         if (status & (IRQ_COAL | IRQ_DLY))
 691                 ll_temac_recv(lp->ndev);
 692
 693         return IRQ_HANDLED;
 694 }
 695
 696 static int temac_open(struct net_device *ndev)
 697 {
 698         struct temac_local *lp = netdev_priv(ndev);
 699         int rc;
 700
 701         dev_dbg(&ndev->dev, "temac_open()\n");
 702
 703         if (lp->phy_node) {
 704                 lp->phy_dev = of_phy_connect(lp->ndev, lp->phy_node,
 705                                              temac_adjust_link, 0, 0);
 706                 if (!lp->phy_dev) {
 707                         dev_err(lp->dev, "of_phy_connect() failed\n");
 708                         return -ENODEV;
 709                 }
 710
 711                 phy_start(lp->phy_dev);
 712         }
 713
 714         rc = request_irq(lp->tx_irq, ll_temac_tx_irq, 0, ndev->name, ndev);
 715         if (rc)
 716                 goto err_tx_irq;
 717         rc = request_irq(lp->rx_irq, ll_temac_rx_irq, 0, ndev->name, ndev);
 718         if (rc)
 719                 goto err_rx_irq;
 720
 721         temac_device_reset(ndev);
 722         return 0;
 723
 724  err_rx_irq:
 725         free_irq(lp->tx_irq, ndev);
 726  err_tx_irq:
 727         if (lp->phy_dev)
 728                 phy_disconnect(lp->phy_dev);
 729         lp->phy_dev = NULL;
 730         dev_err(lp->dev, "request_irq() failed\n");
 731         return rc;
 732 }
 733
 734 static int temac_stop(struct net_device *ndev)
 735 {
 736         struct temac_local *lp = netdev_priv(ndev);
 737
 738         dev_dbg(&ndev->dev, "temac_close()\n");
 739
 740         free_irq(lp->tx_irq, ndev);
 741         free_irq(lp->rx_irq, ndev);
 742
 743         if (lp->phy_dev)
 744                 phy_disconnect(lp->phy_dev);
 745         lp->phy_dev = NULL;
 746
 747         return 0;
 748 }
 749
 750 #ifdef CONFIG_NET_POLL_CONTROLLER
 751 static void
 752 temac_poll_controller(struct net_device *ndev)
 753 {
 754         struct temac_local *lp = netdev_priv(ndev);
 755
 756         disable_irq(lp->tx_irq);
 757         disable_irq(lp->rx_irq);
 758
 759         ll_temac_rx_irq(lp->tx_irq, lp);
 760         ll_temac_tx_irq(lp->rx_irq, lp);
 761
 762         enable_irq(lp->tx_irq);
 763         enable_irq(lp->rx_irq);
 764 }
 765 #endif
 766
 767 static const struct net_device_ops temac_netdev_ops = {
 768         .ndo_open = temac_open,
 769         .ndo_stop = temac_stop,
 770         .ndo_start_xmit = temac_start_xmit,
 771         .ndo_set_mac_address = temac_set_mac_address,
 772         //.ndo_set_multicast_list = temac_set_multicast_list,
 773 #ifdef CONFIG_NET_POLL_CONTROLLER
 774         .ndo_poll_controller = temac_poll_controller,
 775 #endif
 776 };
 777
 778 /* ---------------------------------------------------------------------
 779  * SYSFS device attributes
 780  */
 781 static ssize_t temac_show_llink_regs(struct device *dev,
 782                                      struct device_attribute *attr, char *buf)
 783 {
 784         struct net_device *ndev = dev_get_drvdata(dev);
 785         struct temac_local *lp = netdev_priv(ndev);
 786         int i, len = 0;
 787
 788         for (i = 0; i < 0x11; i++)
 789                 len += sprintf(buf + len, "%.8x%s", temac_dma_in32(lp, i),
 790                                (i % 8) == 7 ? "\n" : " ");
 791         len += sprintf(buf + len, "\n");
 792
 793         return len;
 794 }
 795
 796 static DEVICE_ATTR(llink_regs, 0440, temac_show_llink_regs, NULL);
 797
 798 static struct attribute *temac_device_attrs[] = {
 799         &dev_attr_llink_regs.attr,
 800         NULL,
 801 };
 802
 803 static const struct attribute_group temac_attr_group = {
 804         .attrs = temac_device_attrs,
 805 };
 806
 807 static int __init
 808 temac_of_probe(struct of_device *op, const struct of_device_id *match)
 809 {
 810         struct device_node *np;
 811         struct temac_local *lp;
 812         struct net_device *ndev;
 813         const void *addr;
 814         int size, rc = 0;
 815         unsigned int dcrs;
 816
 817         /* Init network device structure */
 818         ndev = alloc_etherdev(sizeof(*lp));
 819         if (!ndev) {
 820                 dev_err(&op->dev, "could not allocate device.\n");
 821                 return -ENOMEM;
 822         }
 823         ether_setup(ndev);
 824         dev_set_drvdata(&op->dev, ndev);
 825         SET_NETDEV_DEV(ndev, &op->dev);
 826         ndev->flags &= ~IFF_MULTICAST;  /* clear multicast */
 827         ndev->features = NETIF_F_SG | NETIF_F_FRAGLIST;
 828         ndev->netdev_ops = &temac_netdev_ops;
 829 #if 0
 830         ndev->features |= NETIF_F_IP_CSUM; /* Can checksum TCP/UDP over IPv4. */
 831         ndev->features |= NETIF_F_HW_CSUM; /* Can checksum all the packets. */
 832         ndev->features |= NETIF_F_IPV6_CSUM; /* Can checksum IPV6 TCP/UDP */
 833         ndev->features |= NETIF_F_HIGHDMA; /* Can DMA to high memory. */
 834         ndev->features |= NETIF_F_HW_VLAN_TX; /* Transmit VLAN hw accel */
 835         ndev->features |= NETIF_F_HW_VLAN_RX; /* Receive VLAN hw acceleration */
 836         ndev->features |= NETIF_F_HW_VLAN_FILTER; /* Receive VLAN filtering */
 837         ndev->features |= NETIF_F_VLAN_CHALLENGED; /* cannot handle VLAN pkts */
 838         ndev->features |= NETIF_F_GSO; /* Enable software GSO. */
 839         ndev->features |= NETIF_F_MULTI_QUEUE; /* Has multiple TX/RX queues */
 840         ndev->features |= NETIF_F_LRO; /* large receive offload */
 841 #endif
 842
 843         /* setup temac private info structure */
 844         lp = netdev_priv(ndev);
 845         lp->ndev = ndev;
 846         lp->dev = &op->dev;
 847         lp->options = XTE_OPTION_DEFAULTS;
 848         spin_lock_init(&lp->rx_lock);
 849         mutex_init(&lp->indirect_mutex);
 850
 851         /* map device registers */
 852         lp->regs = of_iomap(op->node, 0);
 853         if (!lp->regs) {
 854                 dev_err(&op->dev, "could not map temac regs.\n");
 855                 goto nodev;
 856         }
 857
 858         /* Find the DMA node, map the DMA registers, and decode the DMA IRQs */
 859         np = of_parse_phandle(op->node, "llink-connected", 0);
 860         if (!np) {
 861                 dev_err(&op->dev, "could not find DMA node\n");
 862                 goto nodev;
 863         }
 864
 865         dcrs = dcr_resource_start(np, 0);
 866         if (dcrs == 0) {
 867                 dev_err(&op->dev, "could not get DMA register address\n");
 868                 goto nodev;
 869         }
 870         lp->sdma_dcrs = dcr_map(np, dcrs, dcr_resource_len(np, 0));
 871         dev_dbg(&op->dev, "DCR base: %x\n", dcrs);
 872
 873         lp->rx_irq = irq_of_parse_and_map(np, 0);
 874         lp->tx_irq = irq_of_parse_and_map(np, 1);
 875         if (!lp->rx_irq || !lp->tx_irq) {
 876                 dev_err(&op->dev, "could not determine irqs\n");
 877                 rc = -ENOMEM;
 878                 goto nodev;
 879         }
 880
 881         of_node_put(np); /* Finished with the DMA node; drop the reference */
 882
 883         /* Retrieve the MAC address */
 884         addr = of_get_property(op->node, "local-mac-address", &size);
 885         if ((!addr) || (size != 6)) {
 886                 dev_err(&op->dev, "could not find MAC address\n");
 887                 rc = -ENODEV;
 888                 goto nodev;
 889         }
 890         temac_set_mac_address(ndev, (void *)addr);
 891
 892         rc = temac_mdio_setup(lp, op->node);
 893         if (rc)
 894                 dev_warn(&op->dev, "error registering MDIO bus\n");
 895
 896         lp->phy_node = of_parse_phandle(op->node, "phy-handle", 0);
 897         if (lp->phy_node)
 898                 dev_dbg(lp->dev, "using PHY node %s (%p)\n", np->full_name, np);
 899
 900         /* Add the device attributes */
 901         rc = sysfs_create_group(&lp->dev->kobj, &temac_attr_group);
 902         if (rc) {
 903                 dev_err(lp->dev, "Error creating sysfs files\n");
 904                 goto nodev;
 905         }
 906
 907         rc = register_netdev(lp->ndev);
 908         if (rc) {
 909                 dev_err(lp->dev, "register_netdev() error (%i)\n", rc);
 910                 goto err_register_ndev;
 911         }
 912
 913         return 0;
 914
 915  err_register_ndev:
 916         sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
 917  nodev:
 918         free_netdev(ndev);
 919         ndev = NULL;
 920         return rc;
 921 }
 922
 923 static int __devexit temac_of_remove(struct of_device *op)
 924 {
 925         struct net_device *ndev = dev_get_drvdata(&op->dev);
 926         struct temac_local *lp = netdev_priv(ndev);
 927
 928         temac_mdio_teardown(lp);
 929         unregister_netdev(ndev);
 930         sysfs_remove_group(&lp->dev->kobj, &temac_attr_group);
 931         if (lp->phy_node)
 932                 of_node_put(lp->phy_node);
 933         lp->phy_node = NULL;
 934         dev_set_drvdata(&op->dev, NULL);
 935         free_netdev(ndev);
 936         return 0;
 937 }
 938
 939 static struct of_device_id temac_of_match[] __devinitdata = {
 940         { .compatible = "xlnx,xps-ll-temac-1.01.b", },
 941         {},
 942 };
 943 MODULE_DEVICE_TABLE(of, temac_of_match);
 944
 945 static struct of_platform_driver temac_of_driver = {
 946         .match_table = temac_of_match,
 947         .probe = temac_of_probe,
 948         .remove = __devexit_p(temac_of_remove),
 949         .driver = {
 950                 .owner = THIS_MODULE,
 951                 .name = "xilinx_temac",
 952         },
 953 };
 954
 955 static int __init temac_init(void)
 956 {
 957         return of_register_platform_driver(&temac_of_driver);
 958 }
 959 module_init(temac_init);
 960
 961 static void __exit temac_exit(void)
 962 {
 963         of_unregister_platform_driver(&temac_of_driver);
 964 }
 965 module_exit(temac_exit);
 966
 967 MODULE_DESCRIPTION("Xilinx LL_TEMAC Ethernet driver");
 968 MODULE_AUTHOR("Yoshio Kashiwagi");
 969 MODULE_LICENSE("GPL");