drivers/net/ethernet/faraday/ftmac100.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Faraday FTMAC100 10/100 Ethernet
   4  *
   5  * (C) Copyright 2009-2011 Faraday Technology
   6  * Po-Yu Chuang <ratbert@faraday-tech.com>
   7  */
   8
   9 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/dma-mapping.h>
  12 #include <linux/etherdevice.h>
  13 #include <linux/ethtool.h>
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/io.h>
  17 #include <linux/mii.h>
  18 #include <linux/module.h>
  19 #include <linux/mod_devicetable.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/platform_device.h>
  22
  23 #include "ftmac100.h"
  24
  25 #define DRV_NAME        "ftmac100"
  26
  27 #define RX_QUEUE_ENTRIES        128     /* must be power of 2 */
  28 #define TX_QUEUE_ENTRIES        16      /* must be power of 2 */
  29
  30 #define MAX_PKT_SIZE            1518
  31 #define RX_BUF_SIZE             2044    /* must be smaller than 0x7ff */
  32
  33 #if MAX_PKT_SIZE > 0x7ff
  34 #error invalid MAX_PKT_SIZE
  35 #endif
  36
  37 #if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE
  38 #error invalid RX_BUF_SIZE
  39 #endif
  40
  41 /******************************************************************************
  42  * private data
  43  *****************************************************************************/
  44 struct ftmac100_descs {
  45         struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES];
  46         struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES];
  47 };
  48
  49 struct ftmac100 {
  50         struct resource *res;
  51         void __iomem *base;
  52         int irq;
  53
  54         struct ftmac100_descs *descs;
  55         dma_addr_t descs_dma_addr;
  56
  57         unsigned int rx_pointer;
  58         unsigned int tx_clean_pointer;
  59         unsigned int tx_pointer;
  60         unsigned int tx_pending;
  61
  62         spinlock_t tx_lock;
  63
  64         struct net_device *netdev;
  65         struct device *dev;
  66         struct napi_struct napi;
  67
  68         struct mii_if_info mii;
  69 };
  70
  71 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
  72                                   struct ftmac100_rxdes *rxdes, gfp_t gfp);
  73
  74 /******************************************************************************
  75  * internal functions (hardware register access)
  76  *****************************************************************************/
  77 #define INT_MASK_ALL_ENABLED    (FTMAC100_INT_RPKT_FINISH       | \
  78                                  FTMAC100_INT_NORXBUF           | \
  79                                  FTMAC100_INT_XPKT_OK           | \
  80                                  FTMAC100_INT_XPKT_LOST         | \
  81                                  FTMAC100_INT_RPKT_LOST         | \
  82                                  FTMAC100_INT_AHB_ERR           | \
  83                                  FTMAC100_INT_PHYSTS_CHG)
  84
  85 #define INT_MASK_ALL_DISABLED   0
  86
  87 static void ftmac100_enable_all_int(struct ftmac100 *priv)
  88 {
  89         iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR);
  90 }
  91
  92 static void ftmac100_disable_all_int(struct ftmac100 *priv)
  93 {
  94         iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR);
  95 }
  96
  97 static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
  98 {
  99         iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR);
 100 }
 101
 102 static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr)
 103 {
 104         iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR);
 105 }
 106
 107 static void ftmac100_txdma_start_polling(struct ftmac100 *priv)
 108 {
 109         iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD);
 110 }
 111
 112 static int ftmac100_reset(struct ftmac100 *priv)
 113 {
 114         struct net_device *netdev = priv->netdev;
 115         int i;
 116
 117         /* NOTE: reset clears all registers */
 118         iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR);
 119
 120         for (i = 0; i < 5; i++) {
 121                 unsigned int maccr;
 122
 123                 maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR);
 124                 if (!(maccr & FTMAC100_MACCR_SW_RST)) {
 125                         /*
 126                          * FTMAC100_MACCR_SW_RST cleared does not indicate
 127                          * that hardware reset completed (what the f*ck).
 128                          * We still need to wait for a while.
 129                          */
 130                         udelay(500);
 131                         return 0;
 132                 }
 133
 134                 udelay(1000);
 135         }
 136
 137         netdev_err(netdev, "software reset failed\n");
 138         return -EIO;
 139 }
 140
 141 static void ftmac100_set_mac(struct ftmac100 *priv, const unsigned char *mac)
 142 {
 143         unsigned int maddr = mac[0] << 8 | mac[1];
 144         unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5];
 145
 146         iowrite32(maddr, priv->base + FTMAC100_OFFSET_MAC_MADR);
 147         iowrite32(laddr, priv->base + FTMAC100_OFFSET_MAC_LADR);
 148 }
 149
 150 #define MACCR_ENABLE_ALL        (FTMAC100_MACCR_XMT_EN  | \
 151                                  FTMAC100_MACCR_RCV_EN  | \
 152                                  FTMAC100_MACCR_XDMA_EN | \
 153                                  FTMAC100_MACCR_RDMA_EN | \
 154                                  FTMAC100_MACCR_CRC_APD | \
 155                                  FTMAC100_MACCR_FULLDUP | \
 156                                  FTMAC100_MACCR_RX_RUNT | \
 157                                  FTMAC100_MACCR_RX_BROADPKT)
 158
 159 static int ftmac100_start_hw(struct ftmac100 *priv)
 160 {
 161         struct net_device *netdev = priv->netdev;
 162
 163         if (ftmac100_reset(priv))
 164                 return -EIO;
 165
 166         /* setup ring buffer base registers */
 167         ftmac100_set_rx_ring_base(priv,
 168                                   priv->descs_dma_addr +
 169                                   offsetof(struct ftmac100_descs, rxdes));
 170         ftmac100_set_tx_ring_base(priv,
 171                                   priv->descs_dma_addr +
 172                                   offsetof(struct ftmac100_descs, txdes));
 173
 174         iowrite32(FTMAC100_APTC_RXPOLL_CNT(1), priv->base + FTMAC100_OFFSET_APTC);
 175
 176         ftmac100_set_mac(priv, netdev->dev_addr);
 177
 178         iowrite32(MACCR_ENABLE_ALL, priv->base + FTMAC100_OFFSET_MACCR);
 179         return 0;
 180 }
 181
 182 static void ftmac100_stop_hw(struct ftmac100 *priv)
 183 {
 184         iowrite32(0, priv->base + FTMAC100_OFFSET_MACCR);
 185 }
 186
 187 /******************************************************************************
 188  * internal functions (receive descriptor)
 189  *****************************************************************************/
 190 static bool ftmac100_rxdes_first_segment(struct ftmac100_rxdes *rxdes)
 191 {
 192         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FRS);
 193 }
 194
 195 static bool ftmac100_rxdes_last_segment(struct ftmac100_rxdes *rxdes)
 196 {
 197         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_LRS);
 198 }
 199
 200 static bool ftmac100_rxdes_owned_by_dma(struct ftmac100_rxdes *rxdes)
 201 {
 202         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
 203 }
 204
 205 static void ftmac100_rxdes_set_dma_own(struct ftmac100_rxdes *rxdes)
 206 {
 207         /* clear status bits */
 208         rxdes->rxdes0 = cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN);
 209 }
 210
 211 static bool ftmac100_rxdes_rx_error(struct ftmac100_rxdes *rxdes)
 212 {
 213         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ERR);
 214 }
 215
 216 static bool ftmac100_rxdes_crc_error(struct ftmac100_rxdes *rxdes)
 217 {
 218         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_CRC_ERR);
 219 }
 220
 221 static bool ftmac100_rxdes_frame_too_long(struct ftmac100_rxdes *rxdes)
 222 {
 223         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FTL);
 224 }
 225
 226 static bool ftmac100_rxdes_runt(struct ftmac100_rxdes *rxdes)
 227 {
 228         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RUNT);
 229 }
 230
 231 static bool ftmac100_rxdes_odd_nibble(struct ftmac100_rxdes *rxdes)
 232 {
 233         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ODD_NB);
 234 }
 235
 236 static unsigned int ftmac100_rxdes_frame_length(struct ftmac100_rxdes *rxdes)
 237 {
 238         return le32_to_cpu(rxdes->rxdes0) & FTMAC100_RXDES0_RFL;
 239 }
 240
 241 static bool ftmac100_rxdes_multicast(struct ftmac100_rxdes *rxdes)
 242 {
 243         return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_MULTICAST);
 244 }
 245
 246 static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes,
 247                                            unsigned int size)
 248 {
 249         rxdes->rxdes1 &= cpu_to_le32(FTMAC100_RXDES1_EDORR);
 250         rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_RXBUF_SIZE(size));
 251 }
 252
 253 static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes)
 254 {
 255         rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_EDORR);
 256 }
 257
 258 static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes,
 259                                         dma_addr_t addr)
 260 {
 261         rxdes->rxdes2 = cpu_to_le32(addr);
 262 }
 263
 264 static dma_addr_t ftmac100_rxdes_get_dma_addr(struct ftmac100_rxdes *rxdes)
 265 {
 266         return le32_to_cpu(rxdes->rxdes2);
 267 }
 268
 269 /*
 270  * rxdes3 is not used by hardware. We use it to keep track of page.
 271  * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
 272  */
 273 static void ftmac100_rxdes_set_page(struct ftmac100_rxdes *rxdes, struct page *page)
 274 {
 275         rxdes->rxdes3 = (unsigned int)page;
 276 }
 277
 278 static struct page *ftmac100_rxdes_get_page(struct ftmac100_rxdes *rxdes)
 279 {
 280         return (struct page *)rxdes->rxdes3;
 281 }
 282
 283 /******************************************************************************
 284  * internal functions (receive)
 285  *****************************************************************************/
 286 static int ftmac100_next_rx_pointer(int pointer)
 287 {
 288         return (pointer + 1) & (RX_QUEUE_ENTRIES - 1);
 289 }
 290
 291 static void ftmac100_rx_pointer_advance(struct ftmac100 *priv)
 292 {
 293         priv->rx_pointer = ftmac100_next_rx_pointer(priv->rx_pointer);
 294 }
 295
 296 static struct ftmac100_rxdes *ftmac100_current_rxdes(struct ftmac100 *priv)
 297 {
 298         return &priv->descs->rxdes[priv->rx_pointer];
 299 }
 300
 301 static struct ftmac100_rxdes *
 302 ftmac100_rx_locate_first_segment(struct ftmac100 *priv)
 303 {
 304         struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
 305
 306         while (!ftmac100_rxdes_owned_by_dma(rxdes)) {
 307                 if (ftmac100_rxdes_first_segment(rxdes))
 308                         return rxdes;
 309
 310                 ftmac100_rxdes_set_dma_own(rxdes);
 311                 ftmac100_rx_pointer_advance(priv);
 312                 rxdes = ftmac100_current_rxdes(priv);
 313         }
 314
 315         return NULL;
 316 }
 317
 318 static bool ftmac100_rx_packet_error(struct ftmac100 *priv,
 319                                      struct ftmac100_rxdes *rxdes)
 320 {
 321         struct net_device *netdev = priv->netdev;
 322         bool error = false;
 323
 324         if (unlikely(ftmac100_rxdes_rx_error(rxdes))) {
 325                 if (net_ratelimit())
 326                         netdev_info(netdev, "rx err\n");
 327
 328                 netdev->stats.rx_errors++;
 329                 error = true;
 330         }
 331
 332         if (unlikely(ftmac100_rxdes_crc_error(rxdes))) {
 333                 if (net_ratelimit())
 334                         netdev_info(netdev, "rx crc err\n");
 335
 336                 netdev->stats.rx_crc_errors++;
 337                 error = true;
 338         }
 339
 340         if (unlikely(ftmac100_rxdes_frame_too_long(rxdes))) {
 341                 if (net_ratelimit())
 342                         netdev_info(netdev, "rx frame too long\n");
 343
 344                 netdev->stats.rx_length_errors++;
 345                 error = true;
 346         } else if (unlikely(ftmac100_rxdes_runt(rxdes))) {
 347                 if (net_ratelimit())
 348                         netdev_info(netdev, "rx runt\n");
 349
 350                 netdev->stats.rx_length_errors++;
 351                 error = true;
 352         } else if (unlikely(ftmac100_rxdes_odd_nibble(rxdes))) {
 353                 if (net_ratelimit())
 354                         netdev_info(netdev, "rx odd nibble\n");
 355
 356                 netdev->stats.rx_length_errors++;
 357                 error = true;
 358         }
 359
 360         return error;
 361 }
 362
 363 static void ftmac100_rx_drop_packet(struct ftmac100 *priv)
 364 {
 365         struct net_device *netdev = priv->netdev;
 366         struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv);
 367         bool done = false;
 368
 369         if (net_ratelimit())
 370                 netdev_dbg(netdev, "drop packet %p\n", rxdes);
 371
 372         do {
 373                 if (ftmac100_rxdes_last_segment(rxdes))
 374                         done = true;
 375
 376                 ftmac100_rxdes_set_dma_own(rxdes);
 377                 ftmac100_rx_pointer_advance(priv);
 378                 rxdes = ftmac100_current_rxdes(priv);
 379         } while (!done && !ftmac100_rxdes_owned_by_dma(rxdes));
 380
 381         netdev->stats.rx_dropped++;
 382 }
 383
 384 static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed)
 385 {
 386         struct net_device *netdev = priv->netdev;
 387         struct ftmac100_rxdes *rxdes;
 388         struct sk_buff *skb;
 389         struct page *page;
 390         dma_addr_t map;
 391         int length;
 392         bool ret;
 393
 394         rxdes = ftmac100_rx_locate_first_segment(priv);
 395         if (!rxdes)
 396                 return false;
 397
 398         if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) {
 399                 ftmac100_rx_drop_packet(priv);
 400                 return true;
 401         }
 402
 403         /*
 404          * It is impossible to get multi-segment packets
 405          * because we always provide big enough receive buffers.
 406          */
 407         ret = ftmac100_rxdes_last_segment(rxdes);
 408         BUG_ON(!ret);
 409
 410         /* start processing */
 411         skb = netdev_alloc_skb_ip_align(netdev, 128);
 412         if (unlikely(!skb)) {
 413                 if (net_ratelimit())
 414                         netdev_err(netdev, "rx skb alloc failed\n");
 415
 416                 ftmac100_rx_drop_packet(priv);
 417                 return true;
 418         }
 419
 420         if (unlikely(ftmac100_rxdes_multicast(rxdes)))
 421                 netdev->stats.multicast++;
 422
 423         map = ftmac100_rxdes_get_dma_addr(rxdes);
 424         dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
 425
 426         length = ftmac100_rxdes_frame_length(rxdes);
 427         page = ftmac100_rxdes_get_page(rxdes);
 428         skb_fill_page_desc(skb, 0, page, 0, length);
 429         skb->len += length;
 430         skb->data_len += length;
 431
 432         if (length > 128) {
 433                 skb->truesize += PAGE_SIZE;
 434                 /* We pull the minimum amount into linear part */
 435                 __pskb_pull_tail(skb, ETH_HLEN);
 436         } else {
 437                 /* Small frames are copied into linear part to free one page */
 438                 __pskb_pull_tail(skb, length);
 439         }
 440         ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC);
 441
 442         ftmac100_rx_pointer_advance(priv);
 443
 444         skb->protocol = eth_type_trans(skb, netdev);
 445
 446         netdev->stats.rx_packets++;
 447         netdev->stats.rx_bytes += skb->len;
 448
 449         /* push packet to protocol stack */
 450         netif_receive_skb(skb);
 451
 452         (*processed)++;
 453         return true;
 454 }
 455
 456 /******************************************************************************
 457  * internal functions (transmit descriptor)
 458  *****************************************************************************/
 459 static void ftmac100_txdes_reset(struct ftmac100_txdes *txdes)
 460 {
 461         /* clear all except end of ring bit */
 462         txdes->txdes0 = 0;
 463         txdes->txdes1 &= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
 464         txdes->txdes2 = 0;
 465         txdes->txdes3 = 0;
 466 }
 467
 468 static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes)
 469 {
 470         return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
 471 }
 472
 473 static void ftmac100_txdes_set_dma_own(struct ftmac100_txdes *txdes)
 474 {
 475         /*
 476          * Make sure dma own bit will not be set before any other
 477          * descriptor fields.
 478          */
 479         wmb();
 480         txdes->txdes0 |= cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN);
 481 }
 482
 483 static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes)
 484 {
 485         return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_EXSCOL);
 486 }
 487
 488 static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes)
 489 {
 490         return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_LATECOL);
 491 }
 492
 493 static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes)
 494 {
 495         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_EDOTR);
 496 }
 497
 498 static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes)
 499 {
 500         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_FTS);
 501 }
 502
 503 static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes)
 504 {
 505         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_LTS);
 506 }
 507
 508 static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes)
 509 {
 510         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXIC);
 511 }
 512
 513 static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes,
 514                                            unsigned int len)
 515 {
 516         txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXBUF_SIZE(len));
 517 }
 518
 519 static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes,
 520                                         dma_addr_t addr)
 521 {
 522         txdes->txdes2 = cpu_to_le32(addr);
 523 }
 524
 525 static dma_addr_t ftmac100_txdes_get_dma_addr(struct ftmac100_txdes *txdes)
 526 {
 527         return le32_to_cpu(txdes->txdes2);
 528 }
 529
 530 /*
 531  * txdes3 is not used by hardware. We use it to keep track of socket buffer.
 532  * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu().
 533  */
 534 static void ftmac100_txdes_set_skb(struct ftmac100_txdes *txdes, struct sk_buff *skb)
 535 {
 536         txdes->txdes3 = (unsigned int)skb;
 537 }
 538
 539 static struct sk_buff *ftmac100_txdes_get_skb(struct ftmac100_txdes *txdes)
 540 {
 541         return (struct sk_buff *)txdes->txdes3;
 542 }
 543
 544 /******************************************************************************
 545  * internal functions (transmit)
 546  *****************************************************************************/
 547 static int ftmac100_next_tx_pointer(int pointer)
 548 {
 549         return (pointer + 1) & (TX_QUEUE_ENTRIES - 1);
 550 }
 551
 552 static void ftmac100_tx_pointer_advance(struct ftmac100 *priv)
 553 {
 554         priv->tx_pointer = ftmac100_next_tx_pointer(priv->tx_pointer);
 555 }
 556
 557 static void ftmac100_tx_clean_pointer_advance(struct ftmac100 *priv)
 558 {
 559         priv->tx_clean_pointer = ftmac100_next_tx_pointer(priv->tx_clean_pointer);
 560 }
 561
 562 static struct ftmac100_txdes *ftmac100_current_txdes(struct ftmac100 *priv)
 563 {
 564         return &priv->descs->txdes[priv->tx_pointer];
 565 }
 566
 567 static struct ftmac100_txdes *ftmac100_current_clean_txdes(struct ftmac100 *priv)
 568 {
 569         return &priv->descs->txdes[priv->tx_clean_pointer];
 570 }
 571
 572 static bool ftmac100_tx_complete_packet(struct ftmac100 *priv)
 573 {
 574         struct net_device *netdev = priv->netdev;
 575         struct ftmac100_txdes *txdes;
 576         struct sk_buff *skb;
 577         dma_addr_t map;
 578
 579         if (priv->tx_pending == 0)
 580                 return false;
 581
 582         txdes = ftmac100_current_clean_txdes(priv);
 583
 584         if (ftmac100_txdes_owned_by_dma(txdes))
 585                 return false;
 586
 587         skb = ftmac100_txdes_get_skb(txdes);
 588         map = ftmac100_txdes_get_dma_addr(txdes);
 589
 590         if (unlikely(ftmac100_txdes_excessive_collision(txdes) ||
 591                      ftmac100_txdes_late_collision(txdes))) {
 592                 /*
 593                  * packet transmitted to ethernet lost due to late collision
 594                  * or excessive collision
 595                  */
 596                 netdev->stats.tx_aborted_errors++;
 597         } else {
 598                 netdev->stats.tx_packets++;
 599                 netdev->stats.tx_bytes += skb->len;
 600         }
 601
 602         dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
 603         dev_kfree_skb(skb);
 604
 605         ftmac100_txdes_reset(txdes);
 606
 607         ftmac100_tx_clean_pointer_advance(priv);
 608
 609         spin_lock(&priv->tx_lock);
 610         priv->tx_pending--;
 611         spin_unlock(&priv->tx_lock);
 612         netif_wake_queue(netdev);
 613
 614         return true;
 615 }
 616
 617 static void ftmac100_tx_complete(struct ftmac100 *priv)
 618 {
 619         while (ftmac100_tx_complete_packet(priv))
 620                 ;
 621 }
 622
 623 static netdev_tx_t ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb,
 624                                  dma_addr_t map)
 625 {
 626         struct net_device *netdev = priv->netdev;
 627         struct ftmac100_txdes *txdes;
 628         unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
 629
 630         txdes = ftmac100_current_txdes(priv);
 631         ftmac100_tx_pointer_advance(priv);
 632
 633         /* setup TX descriptor */
 634         ftmac100_txdes_set_skb(txdes, skb);
 635         ftmac100_txdes_set_dma_addr(txdes, map);
 636
 637         ftmac100_txdes_set_first_segment(txdes);
 638         ftmac100_txdes_set_last_segment(txdes);
 639         ftmac100_txdes_set_txint(txdes);
 640         ftmac100_txdes_set_buffer_size(txdes, len);
 641
 642         spin_lock(&priv->tx_lock);
 643         priv->tx_pending++;
 644         if (priv->tx_pending == TX_QUEUE_ENTRIES)
 645                 netif_stop_queue(netdev);
 646
 647         /* start transmit */
 648         ftmac100_txdes_set_dma_own(txdes);
 649         spin_unlock(&priv->tx_lock);
 650
 651         ftmac100_txdma_start_polling(priv);
 652         return NETDEV_TX_OK;
 653 }
 654
 655 /******************************************************************************
 656  * internal functions (buffer)
 657  *****************************************************************************/
 658 static int ftmac100_alloc_rx_page(struct ftmac100 *priv,
 659                                   struct ftmac100_rxdes *rxdes, gfp_t gfp)
 660 {
 661         struct net_device *netdev = priv->netdev;
 662         struct page *page;
 663         dma_addr_t map;
 664
 665         page = alloc_page(gfp);
 666         if (!page) {
 667                 if (net_ratelimit())
 668                         netdev_err(netdev, "failed to allocate rx page\n");
 669                 return -ENOMEM;
 670         }
 671
 672         map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE);
 673         if (unlikely(dma_mapping_error(priv->dev, map))) {
 674                 if (net_ratelimit())
 675                         netdev_err(netdev, "failed to map rx page\n");
 676                 __free_page(page);
 677                 return -ENOMEM;
 678         }
 679
 680         ftmac100_rxdes_set_page(rxdes, page);
 681         ftmac100_rxdes_set_dma_addr(rxdes, map);
 682         ftmac100_rxdes_set_buffer_size(rxdes, RX_BUF_SIZE);
 683         ftmac100_rxdes_set_dma_own(rxdes);
 684         return 0;
 685 }
 686
 687 static void ftmac100_free_buffers(struct ftmac100 *priv)
 688 {
 689         int i;
 690
 691         for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
 692                 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
 693                 struct page *page = ftmac100_rxdes_get_page(rxdes);
 694                 dma_addr_t map = ftmac100_rxdes_get_dma_addr(rxdes);
 695
 696                 if (!page)
 697                         continue;
 698
 699                 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE);
 700                 __free_page(page);
 701         }
 702
 703         for (i = 0; i < TX_QUEUE_ENTRIES; i++) {
 704                 struct ftmac100_txdes *txdes = &priv->descs->txdes[i];
 705                 struct sk_buff *skb = ftmac100_txdes_get_skb(txdes);
 706                 dma_addr_t map = ftmac100_txdes_get_dma_addr(txdes);
 707
 708                 if (!skb)
 709                         continue;
 710
 711                 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE);
 712                 dev_kfree_skb(skb);
 713         }
 714
 715         dma_free_coherent(priv->dev, sizeof(struct ftmac100_descs),
 716                           priv->descs, priv->descs_dma_addr);
 717 }
 718
 719 static int ftmac100_alloc_buffers(struct ftmac100 *priv)
 720 {
 721         int i;
 722
 723         priv->descs = dma_alloc_coherent(priv->dev,
 724                                          sizeof(struct ftmac100_descs),
 725                                          &priv->descs_dma_addr, GFP_KERNEL);
 726         if (!priv->descs)
 727                 return -ENOMEM;
 728
 729         /* initialize RX ring */
 730         ftmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]);
 731
 732         for (i = 0; i < RX_QUEUE_ENTRIES; i++) {
 733                 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i];
 734
 735                 if (ftmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL))
 736                         goto err;
 737         }
 738
 739         /* initialize TX ring */
 740         ftmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]);
 741         return 0;
 742
 743 err:
 744         ftmac100_free_buffers(priv);
 745         return -ENOMEM;
 746 }
 747
 748 /******************************************************************************
 749  * struct mii_if_info functions
 750  *****************************************************************************/
 751 static int ftmac100_mdio_read(struct net_device *netdev, int phy_id, int reg)
 752 {
 753         struct ftmac100 *priv = netdev_priv(netdev);
 754         unsigned int phycr;
 755         int i;
 756
 757         phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
 758                 FTMAC100_PHYCR_REGAD(reg) |
 759                 FTMAC100_PHYCR_MIIRD;
 760
 761         iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
 762
 763         for (i = 0; i < 10; i++) {
 764                 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
 765
 766                 if ((phycr & FTMAC100_PHYCR_MIIRD) == 0)
 767                         return phycr & FTMAC100_PHYCR_MIIRDATA;
 768
 769                 udelay(100);
 770         }
 771
 772         netdev_err(netdev, "mdio read timed out\n");
 773         return 0;
 774 }
 775
 776 static void ftmac100_mdio_write(struct net_device *netdev, int phy_id, int reg,
 777                                 int data)
 778 {
 779         struct ftmac100 *priv = netdev_priv(netdev);
 780         unsigned int phycr;
 781         int i;
 782
 783         phycr = FTMAC100_PHYCR_PHYAD(phy_id) |
 784                 FTMAC100_PHYCR_REGAD(reg) |
 785                 FTMAC100_PHYCR_MIIWR;
 786
 787         data = FTMAC100_PHYWDATA_MIIWDATA(data);
 788
 789         iowrite32(data, priv->base + FTMAC100_OFFSET_PHYWDATA);
 790         iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR);
 791
 792         for (i = 0; i < 10; i++) {
 793                 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR);
 794
 795                 if ((phycr & FTMAC100_PHYCR_MIIWR) == 0)
 796                         return;
 797
 798                 udelay(100);
 799         }
 800
 801         netdev_err(netdev, "mdio write timed out\n");
 802 }
 803
 804 /******************************************************************************
 805  * struct ethtool_ops functions
 806  *****************************************************************************/
 807 static void ftmac100_get_drvinfo(struct net_device *netdev,
 808                                  struct ethtool_drvinfo *info)
 809 {
 810         strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
 811         strlcpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info));
 812 }
 813
 814 static int ftmac100_get_link_ksettings(struct net_device *netdev,
 815                                        struct ethtool_link_ksettings *cmd)
 816 {
 817         struct ftmac100 *priv = netdev_priv(netdev);
 818
 819         mii_ethtool_get_link_ksettings(&priv->mii, cmd);
 820
 821         return 0;
 822 }
 823
 824 static int ftmac100_set_link_ksettings(struct net_device *netdev,
 825                                        const struct ethtool_link_ksettings *cmd)
 826 {
 827         struct ftmac100 *priv = netdev_priv(netdev);
 828         return mii_ethtool_set_link_ksettings(&priv->mii, cmd);
 829 }
 830
 831 static int ftmac100_nway_reset(struct net_device *netdev)
 832 {
 833         struct ftmac100 *priv = netdev_priv(netdev);
 834         return mii_nway_restart(&priv->mii);
 835 }
 836
 837 static u32 ftmac100_get_link(struct net_device *netdev)
 838 {
 839         struct ftmac100 *priv = netdev_priv(netdev);
 840         return mii_link_ok(&priv->mii);
 841 }
 842
 843 static const struct ethtool_ops ftmac100_ethtool_ops = {
 844         .get_drvinfo            = ftmac100_get_drvinfo,
 845         .nway_reset             = ftmac100_nway_reset,
 846         .get_link               = ftmac100_get_link,
 847         .get_link_ksettings     = ftmac100_get_link_ksettings,
 848         .set_link_ksettings     = ftmac100_set_link_ksettings,
 849 };
 850
 851 /******************************************************************************
 852  * interrupt handler
 853  *****************************************************************************/
 854 static irqreturn_t ftmac100_interrupt(int irq, void *dev_id)
 855 {
 856         struct net_device *netdev = dev_id;
 857         struct ftmac100 *priv = netdev_priv(netdev);
 858
 859         /* Disable interrupts for polling */
 860         ftmac100_disable_all_int(priv);
 861         if (likely(netif_running(netdev)))
 862                 napi_schedule(&priv->napi);
 863
 864         return IRQ_HANDLED;
 865 }
 866
 867 /******************************************************************************
 868  * struct napi_struct functions
 869  *****************************************************************************/
 870 static int ftmac100_poll(struct napi_struct *napi, int budget)
 871 {
 872         struct ftmac100 *priv = container_of(napi, struct ftmac100, napi);
 873         struct net_device *netdev = priv->netdev;
 874         unsigned int status;
 875         bool completed = true;
 876         int rx = 0;
 877
 878         status = ioread32(priv->base + FTMAC100_OFFSET_ISR);
 879
 880         if (status & (FTMAC100_INT_RPKT_FINISH | FTMAC100_INT_NORXBUF)) {
 881                 /*
 882                  * FTMAC100_INT_RPKT_FINISH:
 883                  *      RX DMA has received packets into RX buffer successfully
 884                  *
 885                  * FTMAC100_INT_NORXBUF:
 886                  *      RX buffer unavailable
 887                  */
 888                 bool retry;
 889
 890                 do {
 891                         retry = ftmac100_rx_packet(priv, &rx);
 892                 } while (retry && rx < budget);
 893
 894                 if (retry && rx == budget)
 895                         completed = false;
 896         }
 897
 898         if (status & (FTMAC100_INT_XPKT_OK | FTMAC100_INT_XPKT_LOST)) {
 899                 /*
 900                  * FTMAC100_INT_XPKT_OK:
 901                  *      packet transmitted to ethernet successfully
 902                  *
 903                  * FTMAC100_INT_XPKT_LOST:
 904                  *      packet transmitted to ethernet lost due to late
 905                  *      collision or excessive collision
 906                  */
 907                 ftmac100_tx_complete(priv);
 908         }
 909
 910         if (status & (FTMAC100_INT_NORXBUF | FTMAC100_INT_RPKT_LOST |
 911                       FTMAC100_INT_AHB_ERR | FTMAC100_INT_PHYSTS_CHG)) {
 912                 if (net_ratelimit())
 913                         netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
 914                                     status & FTMAC100_INT_NORXBUF ? "NORXBUF " : "",
 915                                     status & FTMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "",
 916                                     status & FTMAC100_INT_AHB_ERR ? "AHB_ERR " : "",
 917                                     status & FTMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : "");
 918
 919                 if (status & FTMAC100_INT_NORXBUF) {
 920                         /* RX buffer unavailable */
 921                         netdev->stats.rx_over_errors++;
 922                 }
 923
 924                 if (status & FTMAC100_INT_RPKT_LOST) {
 925                         /* received packet lost due to RX FIFO full */
 926                         netdev->stats.rx_fifo_errors++;
 927                 }
 928
 929                 if (status & FTMAC100_INT_PHYSTS_CHG) {
 930                         /* PHY link status change */
 931                         mii_check_link(&priv->mii);
 932                 }
 933         }
 934
 935         if (completed) {
 936                 /* stop polling */
 937                 napi_complete(napi);
 938                 ftmac100_enable_all_int(priv);
 939         }
 940
 941         return rx;
 942 }
 943
 944 /******************************************************************************
 945  * struct net_device_ops functions
 946  *****************************************************************************/
 947 static int ftmac100_open(struct net_device *netdev)
 948 {
 949         struct ftmac100 *priv = netdev_priv(netdev);
 950         int err;
 951
 952         err = ftmac100_alloc_buffers(priv);
 953         if (err) {
 954                 netdev_err(netdev, "failed to allocate buffers\n");
 955                 goto err_alloc;
 956         }
 957
 958         err = request_irq(priv->irq, ftmac100_interrupt, 0, netdev->name, netdev);
 959         if (err) {
 960                 netdev_err(netdev, "failed to request irq %d\n", priv->irq);
 961                 goto err_irq;
 962         }
 963
 964         priv->rx_pointer = 0;
 965         priv->tx_clean_pointer = 0;
 966         priv->tx_pointer = 0;
 967         priv->tx_pending = 0;
 968
 969         err = ftmac100_start_hw(priv);
 970         if (err)
 971                 goto err_hw;
 972
 973         napi_enable(&priv->napi);
 974         netif_start_queue(netdev);
 975
 976         ftmac100_enable_all_int(priv);
 977
 978         return 0;
 979
 980 err_hw:
 981         free_irq(priv->irq, netdev);
 982 err_irq:
 983         ftmac100_free_buffers(priv);
 984 err_alloc:
 985         return err;
 986 }
 987
 988 static int ftmac100_stop(struct net_device *netdev)
 989 {
 990         struct ftmac100 *priv = netdev_priv(netdev);
 991
 992         ftmac100_disable_all_int(priv);
 993         netif_stop_queue(netdev);
 994         napi_disable(&priv->napi);
 995         ftmac100_stop_hw(priv);
 996         free_irq(priv->irq, netdev);
 997         ftmac100_free_buffers(priv);
 998
 999         return 0;
1000 }
1001
1002 static netdev_tx_t
1003 ftmac100_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
1004 {
1005         struct ftmac100 *priv = netdev_priv(netdev);
1006         dma_addr_t map;
1007
1008         if (unlikely(skb->len > MAX_PKT_SIZE)) {
1009                 if (net_ratelimit())
1010                         netdev_dbg(netdev, "tx packet too big\n");
1011
1012                 netdev->stats.tx_dropped++;
1013                 dev_kfree_skb(skb);
1014                 return NETDEV_TX_OK;
1015         }
1016
1017         map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);
1018         if (unlikely(dma_mapping_error(priv->dev, map))) {
1019                 /* drop packet */
1020                 if (net_ratelimit())
1021                         netdev_err(netdev, "map socket buffer failed\n");
1022
1023                 netdev->stats.tx_dropped++;
1024                 dev_kfree_skb(skb);
1025                 return NETDEV_TX_OK;
1026         }
1027
1028         return ftmac100_xmit(priv, skb, map);
1029 }
1030
1031 /* optional */
1032 static int ftmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
1033 {
1034         struct ftmac100 *priv = netdev_priv(netdev);
1035         struct mii_ioctl_data *data = if_mii(ifr);
1036
1037         return generic_mii_ioctl(&priv->mii, data, cmd, NULL);
1038 }
1039
1040 static const struct net_device_ops ftmac100_netdev_ops = {
1041         .ndo_open               = ftmac100_open,
1042         .ndo_stop               = ftmac100_stop,
1043         .ndo_start_xmit         = ftmac100_hard_start_xmit,
1044         .ndo_set_mac_address    = eth_mac_addr,
1045         .ndo_validate_addr      = eth_validate_addr,
1046         .ndo_do_ioctl           = ftmac100_do_ioctl,
1047 };
1048
1049 /******************************************************************************
1050  * struct platform_driver functions
1051  *****************************************************************************/
1052 static int ftmac100_probe(struct platform_device *pdev)
1053 {
1054         struct resource *res;
1055         int irq;
1056         struct net_device *netdev;
1057         struct ftmac100 *priv;
1058         int err;
1059
1060         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1061         if (!res)
1062                 return -ENXIO;
1063
1064         irq = platform_get_irq(pdev, 0);
1065         if (irq < 0)
1066                 return irq;
1067
1068         /* setup net_device */
1069         netdev = alloc_etherdev(sizeof(*priv));
1070         if (!netdev) {
1071                 err = -ENOMEM;
1072                 goto err_alloc_etherdev;
1073         }
1074
1075         SET_NETDEV_DEV(netdev, &pdev->dev);
1076         netdev->ethtool_ops = &ftmac100_ethtool_ops;
1077         netdev->netdev_ops = &ftmac100_netdev_ops;
1078
1079         platform_set_drvdata(pdev, netdev);
1080
1081         /* setup private data */
1082         priv = netdev_priv(netdev);
1083         priv->netdev = netdev;
1084         priv->dev = &pdev->dev;
1085
1086         spin_lock_init(&priv->tx_lock);
1087
1088         /* initialize NAPI */
1089         netif_napi_add(netdev, &priv->napi, ftmac100_poll, 64);
1090
1091         /* map io memory */
1092         priv->res = request_mem_region(res->start, resource_size(res),
1093                                        dev_name(&pdev->dev));
1094         if (!priv->res) {
1095                 dev_err(&pdev->dev, "Could not reserve memory region\n");
1096                 err = -ENOMEM;
1097                 goto err_req_mem;
1098         }
1099
1100         priv->base = ioremap(res->start, resource_size(res));
1101         if (!priv->base) {
1102                 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
1103                 err = -EIO;
1104                 goto err_ioremap;
1105         }
1106
1107         priv->irq = irq;
1108
1109         /* initialize struct mii_if_info */
1110         priv->mii.phy_id        = 0;
1111         priv->mii.phy_id_mask   = 0x1f;
1112         priv->mii.reg_num_mask  = 0x1f;
1113         priv->mii.dev           = netdev;
1114         priv->mii.mdio_read     = ftmac100_mdio_read;
1115         priv->mii.mdio_write    = ftmac100_mdio_write;
1116
1117         /* register network device */
1118         err = register_netdev(netdev);
1119         if (err) {
1120                 dev_err(&pdev->dev, "Failed to register netdev\n");
1121                 goto err_register_netdev;
1122         }
1123
1124         netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base);
1125
1126         if (!is_valid_ether_addr(netdev->dev_addr)) {
1127                 eth_hw_addr_random(netdev);
1128                 netdev_info(netdev, "generated random MAC address %pM\n",
1129                             netdev->dev_addr);
1130         }
1131
1132         return 0;
1133
1134 err_register_netdev:
1135         iounmap(priv->base);
1136 err_ioremap:
1137         release_resource(priv->res);
1138 err_req_mem:
1139         netif_napi_del(&priv->napi);
1140         free_netdev(netdev);
1141 err_alloc_etherdev:
1142         return err;
1143 }
1144
1145 static int ftmac100_remove(struct platform_device *pdev)
1146 {
1147         struct net_device *netdev;
1148         struct ftmac100 *priv;
1149
1150         netdev = platform_get_drvdata(pdev);
1151         priv = netdev_priv(netdev);
1152
1153         unregister_netdev(netdev);
1154
1155         iounmap(priv->base);
1156         release_resource(priv->res);
1157
1158         netif_napi_del(&priv->napi);
1159         free_netdev(netdev);
1160         return 0;
1161 }
1162
1163 static const struct of_device_id ftmac100_of_ids[] = {
1164         { .compatible = "andestech,atmac100" },
1165         { }
1166 };
1167
1168 static struct platform_driver ftmac100_driver = {
1169         .probe          = ftmac100_probe,
1170         .remove         = ftmac100_remove,
1171         .driver         = {
1172                 .name   = DRV_NAME,
1173                 .of_match_table = ftmac100_of_ids
1174         },
1175 };
1176
1177 /******************************************************************************
1178  * initialization / finalization
1179  *****************************************************************************/
1180 module_platform_driver(ftmac100_driver);
1181
1182 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");
1183 MODULE_DESCRIPTION("FTMAC100 driver");
1184 MODULE_LICENSE("GPL");
1185 MODULE_DEVICE_TABLE(of, ftmac100_of_ids);