drivers/net/ethernet/faraday/ftgmac100.c

   1 /*
   2  * Faraday FTGMAC100 Gigabit Ethernet
   3  *
   4  * (C) Copyright 2009-2011 Faraday Technology
   5  * Po-Yu Chuang <ratbert@faraday-tech.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  23
  24 #include <linux/dma-mapping.h>
  25 #include <linux/etherdevice.h>
  26 #include <linux/ethtool.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/io.h>
  29 #include <linux/module.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/phy.h>
  32 #include <linux/platform_device.h>
  33 #include <net/ip.h>
  34
  35 #include "ftgmac100.h"
  36
  37 #define DRV_NAME        "ftgmac100"
  38 #define DRV_VERSION     "0.7"
  39
  40 #define RX_QUEUE_ENTRIES        256     /* must be power of 2 */
  41 #define TX_QUEUE_ENTRIES        512     /* must be power of 2 */
  42
  43 #define MAX_PKT_SIZE            1518
  44 #define RX_BUF_SIZE             PAGE_SIZE       /* must be smaller than 0x3fff */
  45
  46 /******************************************************************************
  47  * private data
  48  *****************************************************************************/
  49 struct ftgmac100_descs {
  50         struct ftgmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
  51         struct ftgmac100_txdes txdes[TX_QUEUE_ENTRIES];
  52 };
  53
  54 struct ftgmac100 {
  55         struct resource *res;
  56         void __iomem *base;
  57         int irq;
  58
  59         struct ftgmac100_descs *descs;
  60         dma_addr_t descs_dma_addr;
  61
  62         unsigned int rx_pointer;
  63         unsigned int tx_clean_pointer;
  64         unsigned int tx_pointer;
  65         unsigned int tx_pending;
  66
  67         spinlock_t tx_lock;
  68
  69         struct net_device *netdev;
  70         struct device *dev;
  71         struct napi_struct napi;
  72
  73         struct mii_bus *mii_bus;
  74         struct phy_device *phydev;
  75         int old_speed;
  76 };
  77
  78 static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
  79                                    struct ftgmac100_rxdes *rxdes, gfp_t gfp);
  80
  81 /******************************************************************************
  82  * internal functions (hardware register access)
  83  *****************************************************************************/
  84 #define INT_MASK_ALL_ENABLED    (FTGMAC100_INT_RPKT_LOST        | \
  85                                  FTGMAC100_INT_XPKT_ETH         | \
  86                                  FTGMAC100_INT_XPKT_LOST        | \
  87                                  FTGMAC100_INT_AHB_ERR          | \
  88                                  FTGMAC100_INT_PHYSTS_CHG       | \
  89                                  FTGMAC100_INT_RPKT_BUF         | \
  90                                  FTGMAC100_INT_NO_RXBUF)
  91
  92 static void ftgmac100_set_rx_ring_base(struct ftgmac100 *priv, dma_addr_t addr)
  93 {
  94         iowrite32(addr, priv->base + FTGMAC100_OFFSET_RXR_BADR);
  95 }
  96
  97 static void ftgmac100_set_rx_buffer_size(struct ftgmac100 *priv,
  98                 unsigned int size)
  99 {
 100         size = FTGMAC100_RBSR_SIZE(size);
 101         iowrite32(size, priv->base + FTGMAC100_OFFSET_RBSR);
 102 }
 103
 104 static void ftgmac100_set_normal_prio_tx_ring_base(struct ftgmac100 *priv,
 105                                                    dma_addr_t addr)
 106 {
 107         iowrite32(addr, priv->base + FTGMAC100_OFFSET_NPTXR_BADR);
 108 }
 109
 110 static void ftgmac100_txdma_normal_prio_start_polling(struct ftgmac100 *priv)
 111 {
 112         iowrite32(1, priv->base + FTGMAC100_OFFSET_NPTXPD);
 113 }
 114
 115 static int ftgmac100_reset_hw(struct ftgmac100 *priv)
 116 {
 117         struct net_device *netdev = priv->netdev;
 118         int i;
 119
 120         /* NOTE: reset clears all registers */
 121         iowrite32(FTGMAC100_MACCR_SW_RST, priv->base + FTGMAC100_OFFSET_MACCR);
 122         for (i = 0; i < 5; i++) {
 123                 unsigned int maccr;
 124
 125                 maccr = ioread32(priv->base + FTGMAC100_OFFSET_MACCR);
 126                 if (!(maccr & FTGMAC100_MACCR_SW_RST))
 127                         return 0;
 128
 129                 udelay(1000);
 130         }
 131
 132         netdev_err(netdev, "software reset failed\n");
 133         return -EIO;
 134 }
 135
 136 static void ftgmac100_set_mac(struct ftgmac100 *priv, const unsigned char *mac)
 137 {
 138         unsigned int maddr = mac[0] << 8 | mac[1];
 139         unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
 140
 141         iowrite32(maddr, priv->base + FTGMAC100_OFFSET_MAC_MADR);
 142         iowrite32(laddr, priv->base + FTGMAC100_OFFSET_MAC_LADR);
 143 }
 144
 145 static void ftgmac100_init_hw(struct ftgmac100 *priv)
 146 {
 147         /* setup ring buffer base registers */
 148         ftgmac100_set_rx_ring_base(priv,
 149                                    priv->descs_dma_addr +
 150                                    offsetof(struct ftgmac100_descs, rxdes));
 151         ftgmac100_set_normal_prio_tx_ring_base(priv,
 152                                                priv->descs_dma_addr +
 153                                                offsetof(struct ftgmac100_descs, txdes));
 154
 155         ftgmac100_set_rx_buffer_size(priv, RX_BUF_SIZE);
 156
 157         iowrite32(FTGMAC100_APTC_RXPOLL_CNT(1), priv->base + FTGMAC100_OFFSET_APTC);
 158
 159         ftgmac100_set_mac(priv, priv->netdev->dev_addr);
 160 }
 161
 162 #define MACCR_ENABLE_ALL        (FTGMAC100_MACCR_TXDMA_EN       | \
 163                                  FTGMAC100_MACCR_RXDMA_EN       | \
 164                                  FTGMAC100_MACCR_TXMAC_EN       | \
 165                                  FTGMAC100_MACCR_RXMAC_EN       | \
 166                                  FTGMAC100_MACCR_FULLDUP        | \
 167                                  FTGMAC100_MACCR_CRC_APD        | \
 168                                  FTGMAC100_MACCR_RX_RUNT        | \
 169                                  FTGMAC100_MACCR_RX_BROADPKT)
 170
 171 static void ftgmac100_start_hw(struct ftgmac100 *priv, int speed)
 172 {
 173         int maccr = MACCR_ENABLE_ALL;
 174
 175         switch (speed) {
 176         default:
 177         case 10:
 178                 break;
 179
 180         case 100:
 181                 maccr |= FTGMAC100_MACCR_FAST_MODE;
 182                 break;
 183
 184         case 1000:
 185                 maccr |= FTGMAC100_MACCR_GIGA_MODE;
 186                 break;
 187         }
 188
 189         iowrite32(maccr, priv->base + FTGMAC100_OFFSET_MACCR);
 190 }
 191
 192 static void ftgmac100_stop_hw(struct ftgmac100 *priv)
 193 {
 194         iowrite32(0, priv->base + FTGMAC100_OFFSET_MACCR);
 195 }
 196
 197 /******************************************************************************
 198  * internal functions (receive descriptor)
 199  *****************************************************************************/
 200 static bool ftgmac100_rxdes_first_segment(struct ftgmac100_rxdes *rxdes)
 201 {
 202         return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_FRS);
 203 }
 204
 205 static bool ftgmac100_rxdes_last_segment(struct ftgmac100_rxdes *rxdes)
 206 {
 207         return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_LRS);
 208 }
 209
 210 static bool ftgmac100_rxdes_packet_ready(struct ftgmac100_rxdes *rxdes)
 211 {
 212         return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RXPKT_RDY);
 213 }
 214
 215 static void ftgmac100_rxdes_set_dma_own(struct ftgmac100_rxdes *rxdes)
 216 {
 217         /* clear status bits */
 218         rxdes->rxdes0 &= cpu_to_le32(FTGMAC100_RXDES0_EDORR);
 219 }
 220
 221 static bool ftgmac100_rxdes_rx_error(struct ftgmac100_rxdes *rxdes)
 222 {
 223         return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RX_ERR);
 224 }
 225
 226 static bool ftgmac100_rxdes_crc_error(struct ftgmac100_rxdes *rxdes)
 227 {
 228         return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_CRC_ERR);
 229 }
 230
 231 static bool ftgmac100_rxdes_frame_too_long(struct ftgmac100_rxdes *rxdes)
 232 {
 233         return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_FTL);
 234 }
 235
 236 static bool ftgmac100_rxdes_runt(struct ftgmac100_rxdes *rxdes)
 237 {
 238         return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RUNT);
 239 }
 240
 241 static bool ftgmac100_rxdes_odd_nibble(struct ftgmac100_rxdes *rxdes)
 242 {
 243         return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_RX_ODD_NB);
 244 }
 245
 246 static unsigned int ftgmac100_rxdes_data_length(struct ftgmac100_rxdes *rxdes)
 247 {
 248         return le32_to_cpu(rxdes->rxdes0) & FTGMAC100_RXDES0_VDBC;
 249 }
 250
 251 static bool ftgmac100_rxdes_multicast(struct ftgmac100_rxdes *rxdes)
 252 {
 253         return rxdes->rxdes0 & cpu_to_le32(FTGMAC100_RXDES0_MULTICAST);
 254 }
 255
 256 static void ftgmac100_rxdes_set_end_of_ring(struct ftgmac100_rxdes *rxdes)
 257 {
 258         rxdes->rxdes0 |= cpu_to_le32(FTGMAC100_RXDES0_EDORR);
 259 }
 260
 261 static void ftgmac100_rxdes_set_dma_addr(struct ftgmac100_rxdes *rxdes,
 262                                          dma_addr_t addr)
 263 {
 264         rxdes->rxdes3 = cpu_to_le32(addr);
 265 }
 266
 267 static dma_addr_t ftgmac100_rxdes_get_dma_addr(struct ftgmac100_rxdes *rxdes)
 268 {
 269         return le32_to_cpu(rxdes->rxdes3);
 270 }
 271
 272 static bool ftgmac100_rxdes_is_tcp(struct ftgmac100_rxdes *rxdes)
 273 {
 274         return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) ==
 275                cpu_to_le32(FTGMAC100_RXDES1_PROT_TCPIP);
 276 }
 277
 278 static bool ftgmac100_rxdes_is_udp(struct ftgmac100_rxdes *rxdes)
 279 {
 280         return (rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_PROT_MASK)) ==
 281                cpu_to_le32(FTGMAC100_RXDES1_PROT_UDPIP);
 282 }
 283
 284 static bool ftgmac100_rxdes_tcpcs_err(struct ftgmac100_rxdes *rxdes)
 285 {
 286         return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_TCP_CHKSUM_ERR);
 287 }
 288
 289 static bool ftgmac100_rxdes_udpcs_err(struct ftgmac100_rxdes *rxdes)
 290 {
 291         return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_UDP_CHKSUM_ERR);
 292 }
 293
 294 static bool ftgmac100_rxdes_ipcs_err(struct ftgmac100_rxdes *rxdes)
 295 {
 296         return rxdes->rxdes1 & cpu_to_le32(FTGMAC100_RXDES1_IP_CHKSUM_ERR);
 297 }
 298
 299 /*
 300  * rxdes2 is not used by hardware. We use it to keep track of page.
 301  * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
 302  */
 303 static void ftgmac100_rxdes_set_page(struct ftgmac100_rxdes *rxdes, struct page *page)
 304 {
 305         rxdes->rxdes2 = (unsigned int)page;
 306 }
 307
 308 static struct page *ftgmac100_rxdes_get_page(struct ftgmac100_rxdes *rxdes)
 309 {
 310         return (struct page *)rxdes->rxdes2;
 311 }
 312
 313 /******************************************************************************
 314  * internal functions (receive)
 315  *****************************************************************************/
 316 static int ftgmac100_next_rx_pointer(int pointer)
 317 {
 318         return (pointer + 1) & (RX_QUEUE_ENTRIES - 1);
 319 }
 320
 321 static void ftgmac100_rx_pointer_advance(struct ftgmac100 *priv)
 322 {
 323         priv->rx_pointer = ftgmac100_next_rx_pointer(priv->rx_pointer);
 324 }
 325
 326 static struct ftgmac100_rxdes *ftgmac100_current_rxdes(struct ftgmac100 *priv)
 327 {
 328         return &priv->descs->rxdes[priv->rx_pointer];
 329 }
 330
 331 static struct ftgmac100_rxdes *
 332 ftgmac100_rx_locate_first_segment(struct ftgmac100 *priv)
 333 {
 334         struct ftgmac100_rxdes *rxdes = ftgmac100_current_rxdes(priv);
 335
 336         while (ftgmac100_rxdes_packet_ready(rxdes)) {
 337                 if (ftgmac100_rxdes_first_segment(rxdes))
 338                         return rxdes;
 339
 340                 ftgmac100_rxdes_set_dma_own(rxdes);
 341                 ftgmac100_rx_pointer_advance(priv);
 342                 rxdes = ftgmac100_current_rxdes(priv);
 343         }
 344
 345         return NULL;
 346 }
 347
 348 static bool ftgmac100_rx_packet_error(struct ftgmac100 *priv,
 349                                       struct ftgmac100_rxdes *rxdes)
 350 {
 351         struct net_device *netdev = priv->netdev;
 352         bool error = false;
 353
 354         if (unlikely(ftgmac100_rxdes_rx_error(rxdes))) {
 355                 if (net_ratelimit())
 356                         netdev_info(netdev, "rx err\n");
 357
 358                 netdev->stats.rx_errors++;
 359                 error = true;
 360         }
 361
 362         if (unlikely(ftgmac100_rxdes_crc_error(rxdes))) {
 363                 if (net_ratelimit())
 364                         netdev_info(netdev, "rx crc err\n");
 365
 366                 netdev->stats.rx_crc_errors++;
 367                 error = true;
 368         } else if (unlikely(ftgmac100_rxdes_ipcs_err(rxdes))) {
 369                 if (net_ratelimit())
 370                         netdev_info(netdev, "rx IP checksum err\n");
 371
 372                 error = true;
 373         }
 374
 375         if (unlikely(ftgmac100_rxdes_frame_too_long(rxdes))) {
 376                 if (net_ratelimit())
 377                         netdev_info(netdev, "rx frame too long\n");
 378
 379                 netdev->stats.rx_length_errors++;
 380                 error = true;
 381         } else if (unlikely(ftgmac100_rxdes_runt(rxdes))) {
 382                 if (net_ratelimit())
 383                         netdev_info(netdev, "rx runt\n");
 384
 385                 netdev->stats.rx_length_errors++;
 386                 error = true;
 387         } else if (unlikely(ftgmac100_rxdes_odd_nibble(rxdes))) {
 388                 if (net_ratelimit())
 389                         netdev_info(netdev, "rx odd nibble\n");
 390
 391                 netdev->stats.rx_length_errors++;
 392                 error = true;
 393         }
 394
 395         return error;
 396 }
 397
 398 static void ftgmac100_rx_drop_packet(struct ftgmac100 *priv)
 399 {
 400         struct net_device *netdev = priv->netdev;
 401         struct ftgmac100_rxdes *rxdes = ftgmac100_current_rxdes(priv);
 402         bool done = false;
 403
 404         if (net_ratelimit())
 405                 netdev_dbg(netdev, "drop packet %p\n", rxdes);
 406
 407         do {
 408                 if (ftgmac100_rxdes_last_segment(rxdes))
 409                         done = true;
 410
 411                 ftgmac100_rxdes_set_dma_own(rxdes);
 412                 ftgmac100_rx_pointer_advance(priv);
 413                 rxdes = ftgmac100_current_rxdes(priv);
 414         } while (!done && ftgmac100_rxdes_packet_ready(rxdes));
 415
 416         netdev->stats.rx_dropped++;
 417 }
 418
 419 static bool ftgmac100_rx_packet(struct ftgmac100 *priv, int *processed)
 420 {
 421         struct net_device *netdev = priv->netdev;
 422         struct ftgmac100_rxdes *rxdes;
 423         struct sk_buff *skb;
 424         bool done = false;
 425
 426         rxdes = ftgmac100_rx_locate_first_segment(priv);
 427         if (!rxdes)
 428                 return false;
 429
 430         if (unlikely(ftgmac100_rx_packet_error(priv, rxdes))) {
 431                 ftgmac100_rx_drop_packet(priv);
 432                 return true;
 433         }
 434
 435         /* start processing */
 436         skb = netdev_alloc_skb_ip_align(netdev, 128);
 437         if (unlikely(!skb)) {
 438                 if (net_ratelimit())
 439                         netdev_err(netdev, "rx skb alloc failed\n");
 440
 441                 ftgmac100_rx_drop_packet(priv);
 442                 return true;
 443         }
 444
 445         if (unlikely(ftgmac100_rxdes_multicast(rxdes)))
 446                 netdev->stats.multicast++;
 447
 448         /*
 449          * It seems that HW does checksum incorrectly with fragmented packets,
 450          * so we are conservative here - if HW checksum error, let software do
 451          * the checksum again.
 452          */
 453         if ((ftgmac100_rxdes_is_tcp(rxdes) && !ftgmac100_rxdes_tcpcs_err(rxdes)) ||
 454             (ftgmac100_rxdes_is_udp(rxdes) && !ftgmac100_rxdes_udpcs_err(rxdes)))
 455                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 456
 457         do {
 458                 dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
 459                 struct page *page = ftgmac100_rxdes_get_page(rxdes);
 460                 unsigned int size;
 461
 462                 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
 463
 464                 size = ftgmac100_rxdes_data_length(rxdes);
 465                 skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, 0, size);
 466
 467                 skb->len += size;
 468                 skb->data_len += size;
 469                 skb->truesize += PAGE_SIZE;
 470
 471                 if (ftgmac100_rxdes_last_segment(rxdes))
 472                         done = true;
 473
 474                 ftgmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);
 475
 476                 ftgmac100_rx_pointer_advance(priv);
 477                 rxdes = ftgmac100_current_rxdes(priv);
 478         } while (!done);
 479
 480         /* Small frames are copied into linear part of skb to free one page */
 481         if (skb->len <= 128) {
 482                 skb->truesize -= PAGE_SIZE;
 483                 __pskb_pull_tail(skb, skb->len);
 484         } else {
 485                 /* We pull the minimum amount into linear part */
 486                 __pskb_pull_tail(skb, ETH_HLEN);
 487         }
 488         skb->protocol = eth_type_trans(skb, netdev);
 489
 490         netdev->stats.rx_packets++;
 491         netdev->stats.rx_bytes += skb->len;
 492
 493         /* push packet to protocol stack */
 494         napi_gro_receive(&priv->napi, skb);
 495
 496         (*processed)++;
 497         return true;
 498 }
 499
 500 /******************************************************************************
 501  * internal functions (transmit descriptor)
 502  *****************************************************************************/
 503 static void ftgmac100_txdes_reset(struct ftgmac100_txdes *txdes)
 504 {
 505         /* clear all except end of ring bit */
 506         txdes->txdes0 &= cpu_to_le32(FTGMAC100_TXDES0_EDOTR);
 507         txdes->txdes1 = 0;
 508         txdes->txdes2 = 0;
 509         txdes->txdes3 = 0;
 510 }
 511
 512 static bool ftgmac100_txdes_owned_by_dma(struct ftgmac100_txdes *txdes)
 513 {
 514         return txdes->txdes0 & cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN);
 515 }
 516
 517 static void ftgmac100_txdes_set_dma_own(struct ftgmac100_txdes *txdes)
 518 {
 519         /*
 520          * Make sure dma own bit will not be set before any other
 521          * descriptor fields.
 522          */
 523         wmb();
 524         txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXDMA_OWN);
 525 }
 526
 527 static void ftgmac100_txdes_set_end_of_ring(struct ftgmac100_txdes *txdes)
 528 {
 529         txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_EDOTR);
 530 }
 531
 532 static void ftgmac100_txdes_set_first_segment(struct ftgmac100_txdes *txdes)
 533 {
 534         txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_FTS);
 535 }
 536
 537 static void ftgmac100_txdes_set_last_segment(struct ftgmac100_txdes *txdes)
 538 {
 539         txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_LTS);
 540 }
 541
 542 static void ftgmac100_txdes_set_buffer_size(struct ftgmac100_txdes *txdes,
 543                                             unsigned int len)
 544 {
 545         txdes->txdes0 |= cpu_to_le32(FTGMAC100_TXDES0_TXBUF_SIZE(len));
 546 }
 547
 548 static void ftgmac100_txdes_set_txint(struct ftgmac100_txdes *txdes)
 549 {
 550         txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_TXIC);
 551 }
 552
 553 static void ftgmac100_txdes_set_tcpcs(struct ftgmac100_txdes *txdes)
 554 {
 555         txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_TCP_CHKSUM);
 556 }
 557
 558 static void ftgmac100_txdes_set_udpcs(struct ftgmac100_txdes *txdes)
 559 {
 560         txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_UDP_CHKSUM);
 561 }
 562
 563 static void ftgmac100_txdes_set_ipcs(struct ftgmac100_txdes *txdes)
 564 {
 565         txdes->txdes1 |= cpu_to_le32(FTGMAC100_TXDES1_IP_CHKSUM);
 566 }
 567
 568 static void ftgmac100_txdes_set_dma_addr(struct ftgmac100_txdes *txdes,
 569                                          dma_addr_t addr)
 570 {
 571         txdes->txdes3 = cpu_to_le32(addr);
 572 }
 573
 574 static dma_addr_t ftgmac100_txdes_get_dma_addr(struct ftgmac100_txdes *txdes)
 575 {
 576         return le32_to_cpu(txdes->txdes3);
 577 }
 578
 579 /*
 580  * txdes2 is not used by hardware. We use it to keep track of socket buffer.
 581  * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
 582  */
 583 static void ftgmac100_txdes_set_skb(struct ftgmac100_txdes *txdes,
 584                                     struct sk_buff *skb)
 585 {
 586         txdes->txdes2 = (unsigned int)skb;
 587 }
 588
 589 static struct sk_buff *ftgmac100_txdes_get_skb(struct ftgmac100_txdes *txdes)
 590 {
 591         return (struct sk_buff *)txdes->txdes2;
 592 }
 593
 594 /******************************************************************************
 595  * internal functions (transmit)
 596  *****************************************************************************/
 597 static int ftgmac100_next_tx_pointer(int pointer)
 598 {
 599         return (pointer + 1) & (TX_QUEUE_ENTRIES - 1);
 600 }
 601
 602 static void ftgmac100_tx_pointer_advance(struct ftgmac100 *priv)
 603 {
 604         priv->tx_pointer = ftgmac100_next_tx_pointer(priv->tx_pointer);
 605 }
 606
 607 static void ftgmac100_tx_clean_pointer_advance(struct ftgmac100 *priv)
 608 {
 609         priv->tx_clean_pointer = ftgmac100_next_tx_pointer(priv->tx_clean_pointer);
 610 }
 611
 612 static struct ftgmac100_txdes *ftgmac100_current_txdes(struct ftgmac100 *priv)
 613 {
 614         return &priv->descs->txdes[priv->tx_pointer];
 615 }
 616
 617 static struct ftgmac100_txdes *
 618 ftgmac100_current_clean_txdes(struct ftgmac100 *priv)
 619 {
 620         return &priv->descs->txdes[priv->tx_clean_pointer];
 621 }
 622
 623 static bool ftgmac100_tx_complete_packet(struct ftgmac100 *priv)
 624 {
 625         struct net_device *netdev = priv->netdev;
 626         struct ftgmac100_txdes *txdes;
 627         struct sk_buff *skb;
 628         dma_addr_t map;
 629
 630         if (priv->tx_pending == 0)
 631                 return false;
 632
 633         txdes = ftgmac100_current_clean_txdes(priv);
 634
 635         if (ftgmac100_txdes_owned_by_dma(txdes))
 636                 return false;
 637
 638         skb = ftgmac100_txdes_get_skb(txdes);
 639         map = ftgmac100_txdes_get_dma_addr(txdes);
 640
 641         netdev->stats.tx_packets++;
 642         netdev->stats.tx_bytes += skb->len;
 643
 644         dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
 645
 646         dev_kfree_skb(skb);
 647
 648         ftgmac100_txdes_reset(txdes);
 649
 650         ftgmac100_tx_clean_pointer_advance(priv);
 651
 652         spin_lock(&priv->tx_lock);
 653         priv->tx_pending--;
 654         spin_unlock(&priv->tx_lock);
 655         netif_wake_queue(netdev);
 656
 657         return true;
 658 }
 659
 660 static void ftgmac100_tx_complete(struct ftgmac100 *priv)
 661 {
 662         while (ftgmac100_tx_complete_packet(priv))
 663                 ;
 664 }
 665
 666 static int ftgmac100_xmit(struct ftgmac100 *priv, struct sk_buff *skb,
 667                           dma_addr_t map)
 668 {
 669         struct net_device *netdev = priv->netdev;
 670         struct ftgmac100_txdes *txdes;
 671         unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
 672
 673         txdes = ftgmac100_current_txdes(priv);
 674         ftgmac100_tx_pointer_advance(priv);
 675
 676         /* setup TX descriptor */
 677         ftgmac100_txdes_set_skb(txdes, skb);
 678         ftgmac100_txdes_set_dma_addr(txdes, map);
 679         ftgmac100_txdes_set_buffer_size(txdes, len);
 680
 681         ftgmac100_txdes_set_first_segment(txdes);
 682         ftgmac100_txdes_set_last_segment(txdes);
 683         ftgmac100_txdes_set_txint(txdes);
 684         if (skb->ip_summed == CHECKSUM_PARTIAL) {
 685                 __be16 protocol = skb->protocol;
 686
 687                 if (protocol == cpu_to_be16(ETH_P_IP)) {
 688                         u8 ip_proto = ip_hdr(skb)->protocol;
 689
 690                         ftgmac100_txdes_set_ipcs(txdes);
 691                         if (ip_proto == IPPROTO_TCP)
 692                                 ftgmac100_txdes_set_tcpcs(txdes);
 693                         else if (ip_proto == IPPROTO_UDP)
 694                                 ftgmac100_txdes_set_udpcs(txdes);
 695                 }
 696         }
 697
 698         spin_lock(&priv->tx_lock);
 699         priv->tx_pending++;
 700         if (priv->tx_pending == TX_QUEUE_ENTRIES)
 701                 netif_stop_queue(netdev);
 702
 703         /* start transmit */
 704         ftgmac100_txdes_set_dma_own(txdes);
 705         spin_unlock(&priv->tx_lock);
 706
 707         ftgmac100_txdma_normal_prio_start_polling(priv);
 708
 709         return NETDEV_TX_OK;
 710 }
 711
 712 /******************************************************************************
 713  * internal functions (buffer)
 714  *****************************************************************************/
 715 static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
 716                                    struct ftgmac100_rxdes *rxdes, gfp_t gfp)
 717 {
 718         struct net_device *netdev = priv->netdev;
 719         struct page *page;
 720         dma_addr_t map;
 721
 722         page = alloc_page(gfp);
 723         if (!page) {
 724                 if (net_ratelimit())
 725                         netdev_err(netdev, "failed to allocate rx page\n");
 726                 return -ENOMEM;
 727         }
 728
 729         map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE);
 730         if (unlikely(dma_mapping_error(priv->dev, map))) {
 731                 if (net_ratelimit())
 732                         netdev_err(netdev, "failed to map rx page\n");
 733                 __free_page(page);
 734                 return -ENOMEM;
 735         }
 736
 737         ftgmac100_rxdes_set_page(rxdes, page);
 738         ftgmac100_rxdes_set_dma_addr(rxdes, map);
 739         ftgmac100_rxdes_set_dma_own(rxdes);
 740         return 0;
 741 }
 742
 743 static void ftgmac100_free_buffers(struct ftgmac100 *priv)
 744 {
 745         int i;
 746
 747         for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
 748                 struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i];
 749                 struct page *page = ftgmac100_rxdes_get_page(rxdes);
 750                 dma_addr_t map = ftgmac100_rxdes_get_dma_addr(rxdes);
 751
 752                 if (!page)
 753                         continue;
 754
 755                 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
 756                 __free_page(page);
 757         }
 758
 759         for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
 760                 struct ftgmac100_txdes *txdes = &priv->descs->txdes[i];
 761                 struct sk_buff *skb = ftgmac100_txdes_get_skb(txdes);
 762                 dma_addr_t map = ftgmac100_txdes_get_dma_addr(txdes);
 763
 764                 if (!skb)
 765                         continue;
 766
 767                 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
 768                 kfree_skb(skb);
 769         }
 770
 771         dma_free_coherent(priv->dev, sizeof(struct ftgmac100_descs),
 772                           priv->descs, priv->descs_dma_addr);
 773 }
 774
 775 static int ftgmac100_alloc_buffers(struct ftgmac100 *priv)
 776 {
 777         int i;
 778
 779         priv->descs = dma_zalloc_coherent(priv->dev,
 780                                           sizeof(struct ftgmac100_descs),
 781                                           &priv->descs_dma_addr, GFP_KERNEL);
 782         if (!priv->descs)
 783                 return -ENOMEM;
 784
 785         /* initialize RX ring */
 786         ftgmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
 787
 788         for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
 789                 struct ftgmac100_rxdes *rxdes = &priv->descs->rxdes[i];
 790
 791                 if (ftgmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL))
 792                         goto err;
 793         }
 794
 795         /* initialize TX ring */
 796         ftgmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
 797         return 0;
 798
 799 err:
 800         ftgmac100_free_buffers(priv);
 801         return -ENOMEM;
 802 }
 803
 804 /******************************************************************************
 805  * internal functions (mdio)
 806  *****************************************************************************/
 807 static void ftgmac100_adjust_link(struct net_device *netdev)
 808 {
 809         struct ftgmac100 *priv = netdev_priv(netdev);
 810         struct phy_device *phydev = priv->phydev;
 811         int ier;
 812
 813         if (phydev->speed == priv->old_speed)
 814                 return;
 815
 816         priv->old_speed = phydev->speed;
 817
 818         ier = ioread32(priv->base + FTGMAC100_OFFSET_IER);
 819
 820         /* disable all interrupts */
 821         iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
 822
 823         netif_stop_queue(netdev);
 824         ftgmac100_stop_hw(priv);
 825
 826         netif_start_queue(netdev);
 827         ftgmac100_init_hw(priv);
 828         ftgmac100_start_hw(priv, phydev->speed);
 829
 830         /* re-enable interrupts */
 831         iowrite32(ier, priv->base + FTGMAC100_OFFSET_IER);
 832 }
 833
 834 static int ftgmac100_mii_probe(struct ftgmac100 *priv)
 835 {
 836         struct net_device *netdev = priv->netdev;
 837         struct phy_device *phydev;
 838
 839         phydev = phy_find_first(priv->mii_bus);
 840         if (!phydev) {
 841                 netdev_info(netdev, "%s: no PHY found\n", netdev->name);
 842                 return -ENODEV;
 843         }
 844
 845         phydev = phy_connect(netdev, phydev_name(phydev),
 846                              &ftgmac100_adjust_link, PHY_INTERFACE_MODE_GMII);
 847
 848         if (IS_ERR(phydev)) {
 849                 netdev_err(netdev, "%s: Could not attach to PHY\n", netdev->name);
 850                 return PTR_ERR(phydev);
 851         }
 852
 853         priv->phydev = phydev;
 854         return 0;
 855 }
 856
 857 /******************************************************************************
 858  * struct mii_bus functions
 859  *****************************************************************************/
 860 static int ftgmac100_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
 861 {
 862         struct net_device *netdev = bus->priv;
 863         struct ftgmac100 *priv = netdev_priv(netdev);
 864         unsigned int phycr;
 865         int i;
 866
 867         phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
 868
 869         /* preserve MDC cycle threshold */
 870         phycr &= FTGMAC100_PHYCR_MDC_CYCTHR_MASK;
 871
 872         phycr |= FTGMAC100_PHYCR_PHYAD(phy_addr) |
 873                  FTGMAC100_PHYCR_REGAD(regnum) |
 874                  FTGMAC100_PHYCR_MIIRD;
 875
 876         iowrite32(phycr, priv->base + FTGMAC100_OFFSET_PHYCR);
 877
 878         for (i = 0; i < 10; i++) {
 879                 phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
 880
 881                 if ((phycr & FTGMAC100_PHYCR_MIIRD) == 0) {
 882                         int data;
 883
 884                         data = ioread32(priv->base + FTGMAC100_OFFSET_PHYDATA);
 885                         return FTGMAC100_PHYDATA_MIIRDATA(data);
 886                 }
 887
 888                 udelay(100);
 889         }
 890
 891         netdev_err(netdev, "mdio read timed out\n");
 892         return -EIO;
 893 }
 894
 895 static int ftgmac100_mdiobus_write(struct mii_bus *bus, int phy_addr,
 896                                    int regnum, u16 value)
 897 {
 898         struct net_device *netdev = bus->priv;
 899         struct ftgmac100 *priv = netdev_priv(netdev);
 900         unsigned int phycr;
 901         int data;
 902         int i;
 903
 904         phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
 905
 906         /* preserve MDC cycle threshold */
 907         phycr &= FTGMAC100_PHYCR_MDC_CYCTHR_MASK;
 908
 909         phycr |= FTGMAC100_PHYCR_PHYAD(phy_addr) |
 910                  FTGMAC100_PHYCR_REGAD(regnum) |
 911                  FTGMAC100_PHYCR_MIIWR;
 912
 913         data = FTGMAC100_PHYDATA_MIIWDATA(value);
 914
 915         iowrite32(data, priv->base + FTGMAC100_OFFSET_PHYDATA);
 916         iowrite32(phycr, priv->base + FTGMAC100_OFFSET_PHYCR);
 917
 918         for (i = 0; i < 10; i++) {
 919                 phycr = ioread32(priv->base + FTGMAC100_OFFSET_PHYCR);
 920
 921                 if ((phycr & FTGMAC100_PHYCR_MIIWR) == 0)
 922                         return 0;
 923
 924                 udelay(100);
 925         }
 926
 927         netdev_err(netdev, "mdio write timed out\n");
 928         return -EIO;
 929 }
 930
 931 /******************************************************************************
 932  * struct ethtool_ops functions
 933  *****************************************************************************/
 934 static void ftgmac100_get_drvinfo(struct net_device *netdev,
 935                                   struct ethtool_drvinfo *info)
 936 {
 937         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 938         strlcpy(info->version, DRV_VERSION, sizeof(info->version));
 939         strlcpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info));
 940 }
 941
 942 static int ftgmac100_get_settings(struct net_device *netdev,
 943                                   struct ethtool_cmd *cmd)
 944 {
 945         struct ftgmac100 *priv = netdev_priv(netdev);
 946
 947         return phy_ethtool_gset(priv->phydev, cmd);
 948 }
 949
 950 static int ftgmac100_set_settings(struct net_device *netdev,
 951                                   struct ethtool_cmd *cmd)
 952 {
 953         struct ftgmac100 *priv = netdev_priv(netdev);
 954
 955         return phy_ethtool_sset(priv->phydev, cmd);
 956 }
 957
 958 static const struct ethtool_ops ftgmac100_ethtool_ops = {
 959         .set_settings           = ftgmac100_set_settings,
 960         .get_settings           = ftgmac100_get_settings,
 961         .get_drvinfo            = ftgmac100_get_drvinfo,
 962         .get_link               = ethtool_op_get_link,
 963 };
 964
 965 /******************************************************************************
 966  * interrupt handler
 967  *****************************************************************************/
 968 static irqreturn_t ftgmac100_interrupt(int irq, void *dev_id)
 969 {
 970         struct net_device *netdev = dev_id;
 971         struct ftgmac100 *priv = netdev_priv(netdev);
 972
 973         if (likely(netif_running(netdev))) {
 974                 /* Disable interrupts for polling */
 975                 iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
 976                 napi_schedule(&priv->napi);
 977         }
 978
 979         return IRQ_HANDLED;
 980 }
 981
 982 /******************************************************************************
 983  * struct napi_struct functions
 984  *****************************************************************************/
 985 static int ftgmac100_poll(struct napi_struct *napi, int budget)
 986 {
 987         struct ftgmac100 *priv = container_of(napi, struct ftgmac100, napi);
 988         struct net_device *netdev = priv->netdev;
 989         unsigned int status;
 990         bool completed = true;
 991         int rx = 0;
 992
 993         status = ioread32(priv->base + FTGMAC100_OFFSET_ISR);
 994         iowrite32(status, priv->base + FTGMAC100_OFFSET_ISR);
 995
 996         if (status & (FTGMAC100_INT_RPKT_BUF | FTGMAC100_INT_NO_RXBUF)) {
 997                 /*
 998                  * FTGMAC100_INT_RPKT_BUF:
 999                  *      RX DMA has received packets into RX buffer successfully
1000                  *
1001                  * FTGMAC100_INT_NO_RXBUF:
1002                  *      RX buffer unavailable
1003                  */
1004                 bool retry;
1005
1006                 do {
1007                         retry = ftgmac100_rx_packet(priv, &rx);
1008                 } while (retry && rx < budget);
1009
1010                 if (retry && rx == budget)
1011                         completed = false;
1012         }
1013
1014         if (status & (FTGMAC100_INT_XPKT_ETH | FTGMAC100_INT_XPKT_LOST)) {
1015                 /*
1016                  * FTGMAC100_INT_XPKT_ETH:
1017                  *      packet transmitted to ethernet successfully
1018                  *
1019                  * FTGMAC100_INT_XPKT_LOST:
1020                  *      packet transmitted to ethernet lost due to late
1021                  *      collision or excessive collision
1022                  */
1023                 ftgmac100_tx_complete(priv);
1024         }
1025
1026         if (status & (FTGMAC100_INT_NO_RXBUF | FTGMAC100_INT_RPKT_LOST |
1027                       FTGMAC100_INT_AHB_ERR | FTGMAC100_INT_PHYSTS_CHG)) {
1028                 if (net_ratelimit())
1029                         netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
1030                                     status & FTGMAC100_INT_NO_RXBUF ? "NO_RXBUF " : "",
1031                                     status & FTGMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
1032                                     status & FTGMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
1033                                     status & FTGMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
1034
1035                 if (status & FTGMAC100_INT_NO_RXBUF) {
1036                         /* RX buffer unavailable */
1037                         netdev->stats.rx_over_errors++;
1038                 }
1039
1040                 if (status & FTGMAC100_INT_RPKT_LOST) {
1041                         /* received packet lost due to RX FIFO full */
1042                         netdev->stats.rx_fifo_errors++;
1043                 }
1044         }
1045
1046         if (completed) {
1047                 napi_complete(napi);
1048
1049                 /* enable all interrupts */
1050                 iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
1051         }
1052
1053         return rx;
1054 }
1055
1056 /******************************************************************************
1057  * struct net_device_ops functions
1058  *****************************************************************************/
1059 static int ftgmac100_open(struct net_device *netdev)
1060 {
1061         struct ftgmac100 *priv = netdev_priv(netdev);
1062         int err;
1063
1064         err = ftgmac100_alloc_buffers(priv);
1065         if (err) {
1066                 netdev_err(netdev, "failed to allocate buffers\n");
1067                 goto err_alloc;
1068         }
1069
1070         err = request_irq(priv->irq, ftgmac100_interrupt, 0, netdev->name, netdev);
1071         if (err) {
1072                 netdev_err(netdev, "failed to request irq %d\n", priv->irq);
1073                 goto err_irq;
1074         }
1075
1076         priv->rx_pointer = 0;
1077         priv->tx_clean_pointer = 0;
1078         priv->tx_pointer = 0;
1079         priv->tx_pending = 0;
1080
1081         err = ftgmac100_reset_hw(priv);
1082         if (err)
1083                 goto err_hw;
1084
1085         ftgmac100_init_hw(priv);
1086         ftgmac100_start_hw(priv, 10);
1087
1088         phy_start(priv->phydev);
1089
1090         napi_enable(&priv->napi);
1091         netif_start_queue(netdev);
1092
1093         /* enable all interrupts */
1094         iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
1095         return 0;
1096
1097 err_hw:
1098         free_irq(priv->irq, netdev);
1099 err_irq:
1100         ftgmac100_free_buffers(priv);
1101 err_alloc:
1102         return err;
1103 }
1104
1105 static int ftgmac100_stop(struct net_device *netdev)
1106 {
1107         struct ftgmac100 *priv = netdev_priv(netdev);
1108
1109         /* disable all interrupts */
1110         iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
1111
1112         netif_stop_queue(netdev);
1113         napi_disable(&priv->napi);
1114         phy_stop(priv->phydev);
1115
1116         ftgmac100_stop_hw(priv);
1117         free_irq(priv->irq, netdev);
1118         ftgmac100_free_buffers(priv);
1119
1120         return 0;
1121 }
1122
1123 static int ftgmac100_hard_start_xmit(struct sk_buff *skb,
1124                                      struct net_device *netdev)
1125 {
1126         struct ftgmac100 *priv = netdev_priv(netdev);
1127         dma_addr_t map;
1128
1129         if (unlikely(skb->len > MAX_PKT_SIZE)) {
1130                 if (net_ratelimit())
1131                         netdev_dbg(netdev, "tx packet too big\n");
1132
1133                 netdev->stats.tx_dropped++;
1134                 kfree_skb(skb);
1135                 return NETDEV_TX_OK;
1136         }
1137
1138         map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
1139         if (unlikely(dma_mapping_error(priv->dev, map))) {
1140                 /* drop packet */
1141                 if (net_ratelimit())
1142                         netdev_err(netdev, "map socket buffer failed\n");
1143
1144                 netdev->stats.tx_dropped++;
1145                 kfree_skb(skb);
1146                 return NETDEV_TX_OK;
1147         }
1148
1149         return ftgmac100_xmit(priv, skb, map);
1150 }
1151
1152 /* optional */
1153 static int ftgmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1154 {
1155         struct ftgmac100 *priv = netdev_priv(netdev);
1156
1157         return phy_mii_ioctl(priv->phydev, ifr, cmd);
1158 }
1159
1160 static const struct net_device_ops ftgmac100_netdev_ops = {
1161         .ndo_open               = ftgmac100_open,
1162         .ndo_stop               = ftgmac100_stop,
1163         .ndo_start_xmit         = ftgmac100_hard_start_xmit,
1164         .ndo_set_mac_address    = eth_mac_addr,
1165         .ndo_validate_addr      = eth_validate_addr,
1166         .ndo_do_ioctl           = ftgmac100_do_ioctl,
1167 };
1168
1169 /******************************************************************************
1170  * struct platform_driver functions
1171  *****************************************************************************/
1172 static int ftgmac100_probe(struct platform_device *pdev)
1173 {
1174         struct resource *res;
1175         int irq;
1176         struct net_device *netdev;
1177         struct ftgmac100 *priv;
1178         int err;
1179
1180         if (!pdev)
1181                 return -ENODEV;
1182
1183         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1184         if (!res)
1185                 return -ENXIO;
1186
1187         irq = platform_get_irq(pdev, 0);
1188         if (irq < 0)
1189                 return irq;
1190
1191         /* setup net_device */
1192         netdev = alloc_etherdev(sizeof(*priv));
1193         if (!netdev) {
1194                 err = -ENOMEM;
1195                 goto err_alloc_etherdev;
1196         }
1197
1198         SET_NETDEV_DEV(netdev, &pdev->dev);
1199
1200         netdev->ethtool_ops = &ftgmac100_ethtool_ops;
1201         netdev->netdev_ops = &ftgmac100_netdev_ops;
1202         netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
1203
1204         platform_set_drvdata(pdev, netdev);
1205
1206         /* setup private data */
1207         priv = netdev_priv(netdev);
1208         priv->netdev = netdev;
1209         priv->dev = &pdev->dev;
1210
1211         spin_lock_init(&priv->tx_lock);
1212
1213         /* initialize NAPI */
1214         netif_napi_add(netdev, &priv->napi, ftgmac100_poll, 64);
1215
1216         /* map io memory */
1217         priv->res = request_mem_region(res->start, resource_size(res),
1218                                        dev_name(&pdev->dev));
1219         if (!priv->res) {
1220                 dev_err(&pdev->dev, "Could not reserve memory region\n");
1221                 err = -ENOMEM;
1222                 goto err_req_mem;
1223         }
1224
1225         priv->base = ioremap(res->start, resource_size(res));
1226         if (!priv->base) {
1227                 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
1228                 err = -EIO;
1229                 goto err_ioremap;
1230         }
1231
1232         priv->irq = irq;
1233
1234         /* initialize mdio bus */
1235         priv->mii_bus = mdiobus_alloc();
1236         if (!priv->mii_bus) {
1237                 err = -EIO;
1238                 goto err_alloc_mdiobus;
1239         }
1240
1241         priv->mii_bus->name = "ftgmac100_mdio";
1242         snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "ftgmac100_mii");
1243
1244         priv->mii_bus->priv = netdev;
1245         priv->mii_bus->read = ftgmac100_mdiobus_read;
1246         priv->mii_bus->write = ftgmac100_mdiobus_write;
1247
1248         err = mdiobus_register(priv->mii_bus);
1249         if (err) {
1250                 dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
1251                 goto err_register_mdiobus;
1252         }
1253
1254         err = ftgmac100_mii_probe(priv);
1255         if (err) {
1256                 dev_err(&pdev->dev, "MII Probe failed!\n");
1257                 goto err_mii_probe;
1258         }
1259
1260         /* register network device */
1261         err = register_netdev(netdev);
1262         if (err) {
1263                 dev_err(&pdev->dev, "Failed to register netdev\n");
1264                 goto err_register_netdev;
1265         }
1266
1267         netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base);
1268
1269         if (!is_valid_ether_addr(netdev->dev_addr)) {
1270                 eth_hw_addr_random(netdev);
1271                 netdev_info(netdev, "generated random MAC address %pM\n",
1272                             netdev->dev_addr);
1273         }
1274
1275         return 0;
1276
1277 err_register_netdev:
1278         phy_disconnect(priv->phydev);
1279 err_mii_probe:
1280         mdiobus_unregister(priv->mii_bus);
1281 err_register_mdiobus:
1282         mdiobus_free(priv->mii_bus);
1283 err_alloc_mdiobus:
1284         iounmap(priv->base);
1285 err_ioremap:
1286         release_resource(priv->res);
1287 err_req_mem:
1288         netif_napi_del(&priv->napi);
1289         free_netdev(netdev);
1290 err_alloc_etherdev:
1291         return err;
1292 }
1293
1294 static int __exit ftgmac100_remove(struct platform_device *pdev)
1295 {
1296         struct net_device *netdev;
1297         struct ftgmac100 *priv;
1298
1299         netdev = platform_get_drvdata(pdev);
1300         priv = netdev_priv(netdev);
1301
1302         unregister_netdev(netdev);
1303
1304         phy_disconnect(priv->phydev);
1305         mdiobus_unregister(priv->mii_bus);
1306         mdiobus_free(priv->mii_bus);
1307
1308         iounmap(priv->base);
1309         release_resource(priv->res);
1310
1311         netif_napi_del(&priv->napi);
1312         free_netdev(netdev);
1313         return 0;
1314 }
1315
1316 static struct platform_driver ftgmac100_driver = {
1317         .probe          = ftgmac100_probe,
1318         .remove         = __exit_p(ftgmac100_remove),
1319         .driver         = {
1320                 .name   = DRV_NAME,
1321         },
1322 };
1323
1324 module_platform_driver(ftgmac100_driver);
1325
1326 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
1327 MODULE_DESCRIPTION("FTGMAC100 driver");
1328 MODULE_LICENSE("GPL");