1 /* 2 * Faraday FTMAC100 10/100 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/init.h> 28 #include <linux/interrupt.h> 29 #include <linux/io.h> 30 #include <linux/mii.h> 31 #include <linux/module.h> 32 #include <linux/mod_devicetable.h> 33 #include <linux/netdevice.h> 34 #include <linux/platform_device.h> 35 36 #include "ftmac100.h" 37 38 #define DRV_NAME "ftmac100" 39 #define DRV_VERSION "0.2" 40 41 #define RX_QUEUE_ENTRIES 128 /* must be power of 2 */ 42 #define TX_QUEUE_ENTRIES 16 /* must be power of 2 */ 43 44 #define MAX_PKT_SIZE 1518 45 #define RX_BUF_SIZE 2044 /* must be smaller than 0x7ff */ 46 47 #if MAX_PKT_SIZE > 0x7ff 48 #error invalid MAX_PKT_SIZE 49 #endif 50 51 #if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE 52 #error invalid RX_BUF_SIZE 53 #endif 54 55 /****************************************************************************** 56 * private data 57 *****************************************************************************/ 58 struct ftmac100_descs { 59 struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES]; 60 struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES]; 61 }; 62 63 struct ftmac100 { 64 struct resource *res; 65 void __iomem *base; 66 int irq; 67 68 struct ftmac100_descs *descs; 69 dma_addr_t descs_dma_addr; 70 71 unsigned int rx_pointer; 72 unsigned int tx_clean_pointer; 73 unsigned int tx_pointer; 74 unsigned int tx_pending; 75 76 spinlock_t tx_lock; 77 78 struct net_device *netdev; 79 struct device *dev; 80 struct napi_struct napi; 81 82 struct mii_if_info mii; 83 }; 84 85 static int ftmac100_alloc_rx_page(struct ftmac100 *priv, 86 struct ftmac100_rxdes *rxdes, gfp_t gfp); 87 88 /****************************************************************************** 89 * internal functions (hardware register access) 90 *****************************************************************************/ 91 #define INT_MASK_ALL_ENABLED (FTMAC100_INT_RPKT_FINISH | \ 92 FTMAC100_INT_NORXBUF | \ 93 FTMAC100_INT_XPKT_OK | \ 94 FTMAC100_INT_XPKT_LOST | \ 95 FTMAC100_INT_RPKT_LOST | \ 96 FTMAC100_INT_AHB_ERR | \ 97 FTMAC100_INT_PHYSTS_CHG) 98 99 #define INT_MASK_ALL_DISABLED 0 100 101 static void ftmac100_enable_all_int(struct ftmac100 *priv) 102 { 103 iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR); 104 } 105 106 static void ftmac100_disable_all_int(struct ftmac100 *priv) 107 { 108 iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR); 109 } 110 111 static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr) 112 { 113 iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR); 114 } 115 116 static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr) 117 { 118 iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR); 119 } 120 121 static void ftmac100_txdma_start_polling(struct ftmac100 *priv) 122 { 123 iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD); 124 } 125 126 static int ftmac100_reset(struct ftmac100 *priv) 127 { 128 struct net_device *netdev = priv->netdev; 129 int i; 130 131 /* NOTE: reset clears all registers */ 132 iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR); 133 134 for (i = 0; i < 5; i++) { 135 unsigned int maccr; 136 137 maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR); 138 if (!(maccr & FTMAC100_MACCR_SW_RST)) { 139 /* 140 * FTMAC100_MACCR_SW_RST cleared does not indicate 141 * that hardware reset completed (what the f*ck). 142 * We still need to wait for a while. 143 */ 144 udelay(500); 145 return 0; 146 } 147 148 udelay(1000); 149 } 150 151 netdev_err(netdev, "software reset failed\n"); 152 return -EIO; 153 } 154 155 static void ftmac100_set_mac(struct ftmac100 *priv, const unsigned char *mac) 156 { 157 unsigned int maddr = mac[0] << 8 | mac[1]; 158 unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5]; 159 160 iowrite32(maddr, priv->base + FTMAC100_OFFSET_MAC_MADR); 161 iowrite32(laddr, priv->base + FTMAC100_OFFSET_MAC_LADR); 162 } 163 164 #define MACCR_ENABLE_ALL (FTMAC100_MACCR_XMT_EN | \ 165 FTMAC100_MACCR_RCV_EN | \ 166 FTMAC100_MACCR_XDMA_EN | \ 167 FTMAC100_MACCR_RDMA_EN | \ 168 FTMAC100_MACCR_CRC_APD | \ 169 FTMAC100_MACCR_FULLDUP | \ 170 FTMAC100_MACCR_RX_RUNT | \ 171 FTMAC100_MACCR_RX_BROADPKT) 172 173 static int ftmac100_start_hw(struct ftmac100 *priv) 174 { 175 struct net_device *netdev = priv->netdev; 176 177 if (ftmac100_reset(priv)) 178 return -EIO; 179 180 /* setup ring buffer base registers */ 181 ftmac100_set_rx_ring_base(priv, 182 priv->descs_dma_addr + 183 offsetof(struct ftmac100_descs, rxdes)); 184 ftmac100_set_tx_ring_base(priv, 185 priv->descs_dma_addr + 186 offsetof(struct ftmac100_descs, txdes)); 187 188 iowrite32(FTMAC100_APTC_RXPOLL_CNT(1), priv->base + FTMAC100_OFFSET_APTC); 189 190 ftmac100_set_mac(priv, netdev->dev_addr); 191 192 iowrite32(MACCR_ENABLE_ALL, priv->base + FTMAC100_OFFSET_MACCR); 193 return 0; 194 } 195 196 static void ftmac100_stop_hw(struct ftmac100 *priv) 197 { 198 iowrite32(0, priv->base + FTMAC100_OFFSET_MACCR); 199 } 200 201 /****************************************************************************** 202 * internal functions (receive descriptor) 203 *****************************************************************************/ 204 static bool ftmac100_rxdes_first_segment(struct ftmac100_rxdes *rxdes) 205 { 206 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FRS); 207 } 208 209 static bool ftmac100_rxdes_last_segment(struct ftmac100_rxdes *rxdes) 210 { 211 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_LRS); 212 } 213 214 static bool ftmac100_rxdes_owned_by_dma(struct ftmac100_rxdes *rxdes) 215 { 216 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN); 217 } 218 219 static void ftmac100_rxdes_set_dma_own(struct ftmac100_rxdes *rxdes) 220 { 221 /* clear status bits */ 222 rxdes->rxdes0 = cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN); 223 } 224 225 static bool ftmac100_rxdes_rx_error(struct ftmac100_rxdes *rxdes) 226 { 227 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ERR); 228 } 229 230 static bool ftmac100_rxdes_crc_error(struct ftmac100_rxdes *rxdes) 231 { 232 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_CRC_ERR); 233 } 234 235 static bool ftmac100_rxdes_frame_too_long(struct ftmac100_rxdes *rxdes) 236 { 237 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FTL); 238 } 239 240 static bool ftmac100_rxdes_runt(struct ftmac100_rxdes *rxdes) 241 { 242 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RUNT); 243 } 244 245 static bool ftmac100_rxdes_odd_nibble(struct ftmac100_rxdes *rxdes) 246 { 247 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ODD_NB); 248 } 249 250 static unsigned int ftmac100_rxdes_frame_length(struct ftmac100_rxdes *rxdes) 251 { 252 return le32_to_cpu(rxdes->rxdes0) & FTMAC100_RXDES0_RFL; 253 } 254 255 static bool ftmac100_rxdes_multicast(struct ftmac100_rxdes *rxdes) 256 { 257 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_MULTICAST); 258 } 259 260 static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes, 261 unsigned int size) 262 { 263 rxdes->rxdes1 &= cpu_to_le32(FTMAC100_RXDES1_EDORR); 264 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_RXBUF_SIZE(size)); 265 } 266 267 static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes) 268 { 269 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_EDORR); 270 } 271 272 static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes, 273 dma_addr_t addr) 274 { 275 rxdes->rxdes2 = cpu_to_le32(addr); 276 } 277 278 static dma_addr_t ftmac100_rxdes_get_dma_addr(struct ftmac100_rxdes *rxdes) 279 { 280 return le32_to_cpu(rxdes->rxdes2); 281 } 282 283 /* 284 * rxdes3 is not used by hardware. We use it to keep track of page. 285 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu(). 286 */ 287 static void ftmac100_rxdes_set_page(struct ftmac100_rxdes *rxdes, struct page *page) 288 { 289 rxdes->rxdes3 = (unsigned int)page; 290 } 291 292 static struct page *ftmac100_rxdes_get_page(struct ftmac100_rxdes *rxdes) 293 { 294 return (struct page *)rxdes->rxdes3; 295 } 296 297 /****************************************************************************** 298 * internal functions (receive) 299 *****************************************************************************/ 300 static int ftmac100_next_rx_pointer(int pointer) 301 { 302 return (pointer + 1) & (RX_QUEUE_ENTRIES - 1); 303 } 304 305 static void ftmac100_rx_pointer_advance(struct ftmac100 *priv) 306 { 307 priv->rx_pointer = ftmac100_next_rx_pointer(priv->rx_pointer); 308 } 309 310 static struct ftmac100_rxdes *ftmac100_current_rxdes(struct ftmac100 *priv) 311 { 312 return &priv->descs->rxdes[priv->rx_pointer]; 313 } 314 315 static struct ftmac100_rxdes * 316 ftmac100_rx_locate_first_segment(struct ftmac100 *priv) 317 { 318 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv); 319 320 while (!ftmac100_rxdes_owned_by_dma(rxdes)) { 321 if (ftmac100_rxdes_first_segment(rxdes)) 322 return rxdes; 323 324 ftmac100_rxdes_set_dma_own(rxdes); 325 ftmac100_rx_pointer_advance(priv); 326 rxdes = ftmac100_current_rxdes(priv); 327 } 328 329 return NULL; 330 } 331 332 static bool ftmac100_rx_packet_error(struct ftmac100 *priv, 333 struct ftmac100_rxdes *rxdes) 334 { 335 struct net_device *netdev = priv->netdev; 336 bool error = false; 337 338 if (unlikely(ftmac100_rxdes_rx_error(rxdes))) { 339 if (net_ratelimit()) 340 netdev_info(netdev, "rx err\n"); 341 342 netdev->stats.rx_errors++; 343 error = true; 344 } 345 346 if (unlikely(ftmac100_rxdes_crc_error(rxdes))) { 347 if (net_ratelimit()) 348 netdev_info(netdev, "rx crc err\n"); 349 350 netdev->stats.rx_crc_errors++; 351 error = true; 352 } 353 354 if (unlikely(ftmac100_rxdes_frame_too_long(rxdes))) { 355 if (net_ratelimit()) 356 netdev_info(netdev, "rx frame too long\n"); 357 358 netdev->stats.rx_length_errors++; 359 error = true; 360 } else if (unlikely(ftmac100_rxdes_runt(rxdes))) { 361 if (net_ratelimit()) 362 netdev_info(netdev, "rx runt\n"); 363 364 netdev->stats.rx_length_errors++; 365 error = true; 366 } else if (unlikely(ftmac100_rxdes_odd_nibble(rxdes))) { 367 if (net_ratelimit()) 368 netdev_info(netdev, "rx odd nibble\n"); 369 370 netdev->stats.rx_length_errors++; 371 error = true; 372 } 373 374 return error; 375 } 376 377 static void ftmac100_rx_drop_packet(struct ftmac100 *priv) 378 { 379 struct net_device *netdev = priv->netdev; 380 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv); 381 bool done = false; 382 383 if (net_ratelimit()) 384 netdev_dbg(netdev, "drop packet %p\n", rxdes); 385 386 do { 387 if (ftmac100_rxdes_last_segment(rxdes)) 388 done = true; 389 390 ftmac100_rxdes_set_dma_own(rxdes); 391 ftmac100_rx_pointer_advance(priv); 392 rxdes = ftmac100_current_rxdes(priv); 393 } while (!done && !ftmac100_rxdes_owned_by_dma(rxdes)); 394 395 netdev->stats.rx_dropped++; 396 } 397 398 static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed) 399 { 400 struct net_device *netdev = priv->netdev; 401 struct ftmac100_rxdes *rxdes; 402 struct sk_buff *skb; 403 struct page *page; 404 dma_addr_t map; 405 int length; 406 bool ret; 407 408 rxdes = ftmac100_rx_locate_first_segment(priv); 409 if (!rxdes) 410 return false; 411 412 if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) { 413 ftmac100_rx_drop_packet(priv); 414 return true; 415 } 416 417 /* 418 * It is impossible to get multi-segment packets 419 * because we always provide big enough receive buffers. 420 */ 421 ret = ftmac100_rxdes_last_segment(rxdes); 422 BUG_ON(!ret); 423 424 /* start processing */ 425 skb = netdev_alloc_skb_ip_align(netdev, 128); 426 if (unlikely(!skb)) { 427 if (net_ratelimit()) 428 netdev_err(netdev, "rx skb alloc failed\n"); 429 430 ftmac100_rx_drop_packet(priv); 431 return true; 432 } 433 434 if (unlikely(ftmac100_rxdes_multicast(rxdes))) 435 netdev->stats.multicast++; 436 437 map = ftmac100_rxdes_get_dma_addr(rxdes); 438 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE); 439 440 length = ftmac100_rxdes_frame_length(rxdes); 441 page = ftmac100_rxdes_get_page(rxdes); 442 skb_fill_page_desc(skb, 0, page, 0, length); 443 skb->len += length; 444 skb->data_len += length; 445 446 if (length > 128) { 447 skb->truesize += PAGE_SIZE; 448 /* We pull the minimum amount into linear part */ 449 __pskb_pull_tail(skb, ETH_HLEN); 450 } else { 451 /* Small frames are copied into linear part to free one page */ 452 __pskb_pull_tail(skb, length); 453 } 454 ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC); 455 456 ftmac100_rx_pointer_advance(priv); 457 458 skb->protocol = eth_type_trans(skb, netdev); 459 460 netdev->stats.rx_packets++; 461 netdev->stats.rx_bytes += skb->len; 462 463 /* push packet to protocol stack */ 464 netif_receive_skb(skb); 465 466 (*processed)++; 467 return true; 468 } 469 470 /****************************************************************************** 471 * internal functions (transmit descriptor) 472 *****************************************************************************/ 473 static void ftmac100_txdes_reset(struct ftmac100_txdes *txdes) 474 { 475 /* clear all except end of ring bit */ 476 txdes->txdes0 = 0; 477 txdes->txdes1 &= cpu_to_le32(FTMAC100_TXDES1_EDOTR); 478 txdes->txdes2 = 0; 479 txdes->txdes3 = 0; 480 } 481 482 static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes) 483 { 484 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN); 485 } 486 487 static void ftmac100_txdes_set_dma_own(struct ftmac100_txdes *txdes) 488 { 489 /* 490 * Make sure dma own bit will not be set before any other 491 * descriptor fields. 492 */ 493 wmb(); 494 txdes->txdes0 |= cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN); 495 } 496 497 static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes) 498 { 499 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_EXSCOL); 500 } 501 502 static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes) 503 { 504 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_LATECOL); 505 } 506 507 static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes) 508 { 509 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_EDOTR); 510 } 511 512 static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes) 513 { 514 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_FTS); 515 } 516 517 static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes) 518 { 519 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_LTS); 520 } 521 522 static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes) 523 { 524 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXIC); 525 } 526 527 static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes, 528 unsigned int len) 529 { 530 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXBUF_SIZE(len)); 531 } 532 533 static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes, 534 dma_addr_t addr) 535 { 536 txdes->txdes2 = cpu_to_le32(addr); 537 } 538 539 static dma_addr_t ftmac100_txdes_get_dma_addr(struct ftmac100_txdes *txdes) 540 { 541 return le32_to_cpu(txdes->txdes2); 542 } 543 544 /* 545 * txdes3 is not used by hardware. We use it to keep track of socket buffer. 546 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu(). 547 */ 548 static void ftmac100_txdes_set_skb(struct ftmac100_txdes *txdes, struct sk_buff *skb) 549 { 550 txdes->txdes3 = (unsigned int)skb; 551 } 552 553 static struct sk_buff *ftmac100_txdes_get_skb(struct ftmac100_txdes *txdes) 554 { 555 return (struct sk_buff *)txdes->txdes3; 556 } 557 558 /****************************************************************************** 559 * internal functions (transmit) 560 *****************************************************************************/ 561 static int ftmac100_next_tx_pointer(int pointer) 562 { 563 return (pointer + 1) & (TX_QUEUE_ENTRIES - 1); 564 } 565 566 static void ftmac100_tx_pointer_advance(struct ftmac100 *priv) 567 { 568 priv->tx_pointer = ftmac100_next_tx_pointer(priv->tx_pointer); 569 } 570 571 static void ftmac100_tx_clean_pointer_advance(struct ftmac100 *priv) 572 { 573 priv->tx_clean_pointer = ftmac100_next_tx_pointer(priv->tx_clean_pointer); 574 } 575 576 static struct ftmac100_txdes *ftmac100_current_txdes(struct ftmac100 *priv) 577 { 578 return &priv->descs->txdes[priv->tx_pointer]; 579 } 580 581 static struct ftmac100_txdes *ftmac100_current_clean_txdes(struct ftmac100 *priv) 582 { 583 return &priv->descs->txdes[priv->tx_clean_pointer]; 584 } 585 586 static bool ftmac100_tx_complete_packet(struct ftmac100 *priv) 587 { 588 struct net_device *netdev = priv->netdev; 589 struct ftmac100_txdes *txdes; 590 struct sk_buff *skb; 591 dma_addr_t map; 592 593 if (priv->tx_pending == 0) 594 return false; 595 596 txdes = ftmac100_current_clean_txdes(priv); 597 598 if (ftmac100_txdes_owned_by_dma(txdes)) 599 return false; 600 601 skb = ftmac100_txdes_get_skb(txdes); 602 map = ftmac100_txdes_get_dma_addr(txdes); 603 604 if (unlikely(ftmac100_txdes_excessive_collision(txdes) || 605 ftmac100_txdes_late_collision(txdes))) { 606 /* 607 * packet transmitted to ethernet lost due to late collision 608 * or excessive collision 609 */ 610 netdev->stats.tx_aborted_errors++; 611 } else { 612 netdev->stats.tx_packets++; 613 netdev->stats.tx_bytes += skb->len; 614 } 615 616 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE); 617 dev_kfree_skb(skb); 618 619 ftmac100_txdes_reset(txdes); 620 621 ftmac100_tx_clean_pointer_advance(priv); 622 623 spin_lock(&priv->tx_lock); 624 priv->tx_pending--; 625 spin_unlock(&priv->tx_lock); 626 netif_wake_queue(netdev); 627 628 return true; 629 } 630 631 static void ftmac100_tx_complete(struct ftmac100 *priv) 632 { 633 while (ftmac100_tx_complete_packet(priv)) 634 ; 635 } 636 637 static netdev_tx_t ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb, 638 dma_addr_t map) 639 { 640 struct net_device *netdev = priv->netdev; 641 struct ftmac100_txdes *txdes; 642 unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len; 643 644 txdes = ftmac100_current_txdes(priv); 645 ftmac100_tx_pointer_advance(priv); 646 647 /* setup TX descriptor */ 648 ftmac100_txdes_set_skb(txdes, skb); 649 ftmac100_txdes_set_dma_addr(txdes, map); 650 651 ftmac100_txdes_set_first_segment(txdes); 652 ftmac100_txdes_set_last_segment(txdes); 653 ftmac100_txdes_set_txint(txdes); 654 ftmac100_txdes_set_buffer_size(txdes, len); 655 656 spin_lock(&priv->tx_lock); 657 priv->tx_pending++; 658 if (priv->tx_pending == TX_QUEUE_ENTRIES) 659 netif_stop_queue(netdev); 660 661 /* start transmit */ 662 ftmac100_txdes_set_dma_own(txdes); 663 spin_unlock(&priv->tx_lock); 664 665 ftmac100_txdma_start_polling(priv); 666 return NETDEV_TX_OK; 667 } 668 669 /****************************************************************************** 670 * internal functions (buffer) 671 *****************************************************************************/ 672 static int ftmac100_alloc_rx_page(struct ftmac100 *priv, 673 struct ftmac100_rxdes *rxdes, gfp_t gfp) 674 { 675 struct net_device *netdev = priv->netdev; 676 struct page *page; 677 dma_addr_t map; 678 679 page = alloc_page(gfp); 680 if (!page) { 681 if (net_ratelimit()) 682 netdev_err(netdev, "failed to allocate rx page\n"); 683 return -ENOMEM; 684 } 685 686 map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE); 687 if (unlikely(dma_mapping_error(priv->dev, map))) { 688 if (net_ratelimit()) 689 netdev_err(netdev, "failed to map rx page\n"); 690 __free_page(page); 691 return -ENOMEM; 692 } 693 694 ftmac100_rxdes_set_page(rxdes, page); 695 ftmac100_rxdes_set_dma_addr(rxdes, map); 696 ftmac100_rxdes_set_buffer_size(rxdes, RX_BUF_SIZE); 697 ftmac100_rxdes_set_dma_own(rxdes); 698 return 0; 699 } 700 701 static void ftmac100_free_buffers(struct ftmac100 *priv) 702 { 703 int i; 704 705 for (i = 0; i < RX_QUEUE_ENTRIES; i++) { 706 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i]; 707 struct page *page = ftmac100_rxdes_get_page(rxdes); 708 dma_addr_t map = ftmac100_rxdes_get_dma_addr(rxdes); 709 710 if (!page) 711 continue; 712 713 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE); 714 __free_page(page); 715 } 716 717 for (i = 0; i < TX_QUEUE_ENTRIES; i++) { 718 struct ftmac100_txdes *txdes = &priv->descs->txdes[i]; 719 struct sk_buff *skb = ftmac100_txdes_get_skb(txdes); 720 dma_addr_t map = ftmac100_txdes_get_dma_addr(txdes); 721 722 if (!skb) 723 continue; 724 725 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE); 726 dev_kfree_skb(skb); 727 } 728 729 dma_free_coherent(priv->dev, sizeof(struct ftmac100_descs), 730 priv->descs, priv->descs_dma_addr); 731 } 732 733 static int ftmac100_alloc_buffers(struct ftmac100 *priv) 734 { 735 int i; 736 737 priv->descs = dma_alloc_coherent(priv->dev, 738 sizeof(struct ftmac100_descs), 739 &priv->descs_dma_addr, GFP_KERNEL); 740 if (!priv->descs) 741 return -ENOMEM; 742 743 /* initialize RX ring */ 744 ftmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]); 745 746 for (i = 0; i < RX_QUEUE_ENTRIES; i++) { 747 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i]; 748 749 if (ftmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL)) 750 goto err; 751 } 752 753 /* initialize TX ring */ 754 ftmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]); 755 return 0; 756 757 err: 758 ftmac100_free_buffers(priv); 759 return -ENOMEM; 760 } 761 762 /****************************************************************************** 763 * struct mii_if_info functions 764 *****************************************************************************/ 765 static int ftmac100_mdio_read(struct net_device *netdev, int phy_id, int reg) 766 { 767 struct ftmac100 *priv = netdev_priv(netdev); 768 unsigned int phycr; 769 int i; 770 771 phycr = FTMAC100_PHYCR_PHYAD(phy_id) | 772 FTMAC100_PHYCR_REGAD(reg) | 773 FTMAC100_PHYCR_MIIRD; 774 775 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR); 776 777 for (i = 0; i < 10; i++) { 778 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR); 779 780 if ((phycr & FTMAC100_PHYCR_MIIRD) == 0) 781 return phycr & FTMAC100_PHYCR_MIIRDATA; 782 783 udelay(100); 784 } 785 786 netdev_err(netdev, "mdio read timed out\n"); 787 return 0; 788 } 789 790 static void ftmac100_mdio_write(struct net_device *netdev, int phy_id, int reg, 791 int data) 792 { 793 struct ftmac100 *priv = netdev_priv(netdev); 794 unsigned int phycr; 795 int i; 796 797 phycr = FTMAC100_PHYCR_PHYAD(phy_id) | 798 FTMAC100_PHYCR_REGAD(reg) | 799 FTMAC100_PHYCR_MIIWR; 800 801 data = FTMAC100_PHYWDATA_MIIWDATA(data); 802 803 iowrite32(data, priv->base + FTMAC100_OFFSET_PHYWDATA); 804 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR); 805 806 for (i = 0; i < 10; i++) { 807 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR); 808 809 if ((phycr & FTMAC100_PHYCR_MIIWR) == 0) 810 return; 811 812 udelay(100); 813 } 814 815 netdev_err(netdev, "mdio write timed out\n"); 816 } 817 818 /****************************************************************************** 819 * struct ethtool_ops functions 820 *****************************************************************************/ 821 static void ftmac100_get_drvinfo(struct net_device *netdev, 822 struct ethtool_drvinfo *info) 823 { 824 strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); 825 strlcpy(info->version, DRV_VERSION, sizeof(info->version)); 826 strlcpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info)); 827 } 828 829 static int ftmac100_get_link_ksettings(struct net_device *netdev, 830 struct ethtool_link_ksettings *cmd) 831 { 832 struct ftmac100 *priv = netdev_priv(netdev); 833 834 mii_ethtool_get_link_ksettings(&priv->mii, cmd); 835 836 return 0; 837 } 838 839 static int ftmac100_set_link_ksettings(struct net_device *netdev, 840 const struct ethtool_link_ksettings *cmd) 841 { 842 struct ftmac100 *priv = netdev_priv(netdev); 843 return mii_ethtool_set_link_ksettings(&priv->mii, cmd); 844 } 845 846 static int ftmac100_nway_reset(struct net_device *netdev) 847 { 848 struct ftmac100 *priv = netdev_priv(netdev); 849 return mii_nway_restart(&priv->mii); 850 } 851 852 static u32 ftmac100_get_link(struct net_device *netdev) 853 { 854 struct ftmac100 *priv = netdev_priv(netdev); 855 return mii_link_ok(&priv->mii); 856 } 857 858 static const struct ethtool_ops ftmac100_ethtool_ops = { 859 .get_drvinfo = ftmac100_get_drvinfo, 860 .nway_reset = ftmac100_nway_reset, 861 .get_link = ftmac100_get_link, 862 .get_link_ksettings = ftmac100_get_link_ksettings, 863 .set_link_ksettings = ftmac100_set_link_ksettings, 864 }; 865 866 /****************************************************************************** 867 * interrupt handler 868 *****************************************************************************/ 869 static irqreturn_t ftmac100_interrupt(int irq, void *dev_id) 870 { 871 struct net_device *netdev = dev_id; 872 struct ftmac100 *priv = netdev_priv(netdev); 873 874 /* Disable interrupts for polling */ 875 ftmac100_disable_all_int(priv); 876 if (likely(netif_running(netdev))) 877 napi_schedule(&priv->napi); 878 879 return IRQ_HANDLED; 880 } 881 882 /****************************************************************************** 883 * struct napi_struct functions 884 *****************************************************************************/ 885 static int ftmac100_poll(struct napi_struct *napi, int budget) 886 { 887 struct ftmac100 *priv = container_of(napi, struct ftmac100, napi); 888 struct net_device *netdev = priv->netdev; 889 unsigned int status; 890 bool completed = true; 891 int rx = 0; 892 893 status = ioread32(priv->base + FTMAC100_OFFSET_ISR); 894 895 if (status & (FTMAC100_INT_RPKT_FINISH | FTMAC100_INT_NORXBUF)) { 896 /* 897 * FTMAC100_INT_RPKT_FINISH: 898 * RX DMA has received packets into RX buffer successfully 899 * 900 * FTMAC100_INT_NORXBUF: 901 * RX buffer unavailable 902 */ 903 bool retry; 904 905 do { 906 retry = ftmac100_rx_packet(priv, &rx); 907 } while (retry && rx < budget); 908 909 if (retry && rx == budget) 910 completed = false; 911 } 912 913 if (status & (FTMAC100_INT_XPKT_OK | FTMAC100_INT_XPKT_LOST)) { 914 /* 915 * FTMAC100_INT_XPKT_OK: 916 * packet transmitted to ethernet successfully 917 * 918 * FTMAC100_INT_XPKT_LOST: 919 * packet transmitted to ethernet lost due to late 920 * collision or excessive collision 921 */ 922 ftmac100_tx_complete(priv); 923 } 924 925 if (status & (FTMAC100_INT_NORXBUF | FTMAC100_INT_RPKT_LOST | 926 FTMAC100_INT_AHB_ERR | FTMAC100_INT_PHYSTS_CHG)) { 927 if (net_ratelimit()) 928 netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status, 929 status & FTMAC100_INT_NORXBUF ? "NORXBUF " : "", 930 status & FTMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "", 931 status & FTMAC100_INT_AHB_ERR ? "AHB_ERR " : "", 932 status & FTMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : ""); 933 934 if (status & FTMAC100_INT_NORXBUF) { 935 /* RX buffer unavailable */ 936 netdev->stats.rx_over_errors++; 937 } 938 939 if (status & FTMAC100_INT_RPKT_LOST) { 940 /* received packet lost due to RX FIFO full */ 941 netdev->stats.rx_fifo_errors++; 942 } 943 944 if (status & FTMAC100_INT_PHYSTS_CHG) { 945 /* PHY link status change */ 946 mii_check_link(&priv->mii); 947 } 948 } 949 950 if (completed) { 951 /* stop polling */ 952 napi_complete(napi); 953 ftmac100_enable_all_int(priv); 954 } 955 956 return rx; 957 } 958 959 /****************************************************************************** 960 * struct net_device_ops functions 961 *****************************************************************************/ 962 static int ftmac100_open(struct net_device *netdev) 963 { 964 struct ftmac100 *priv = netdev_priv(netdev); 965 int err; 966 967 err = ftmac100_alloc_buffers(priv); 968 if (err) { 969 netdev_err(netdev, "failed to allocate buffers\n"); 970 goto err_alloc; 971 } 972 973 err = request_irq(priv->irq, ftmac100_interrupt, 0, netdev->name, netdev); 974 if (err) { 975 netdev_err(netdev, "failed to request irq %d\n", priv->irq); 976 goto err_irq; 977 } 978 979 priv->rx_pointer = 0; 980 priv->tx_clean_pointer = 0; 981 priv->tx_pointer = 0; 982 priv->tx_pending = 0; 983 984 err = ftmac100_start_hw(priv); 985 if (err) 986 goto err_hw; 987 988 napi_enable(&priv->napi); 989 netif_start_queue(netdev); 990 991 ftmac100_enable_all_int(priv); 992 993 return 0; 994 995 err_hw: 996 free_irq(priv->irq, netdev); 997 err_irq: 998 ftmac100_free_buffers(priv); 999 err_alloc: 1000 return err; 1001 } 1002 1003 static int ftmac100_stop(struct net_device *netdev) 1004 { 1005 struct ftmac100 *priv = netdev_priv(netdev); 1006 1007 ftmac100_disable_all_int(priv); 1008 netif_stop_queue(netdev); 1009 napi_disable(&priv->napi); 1010 ftmac100_stop_hw(priv); 1011 free_irq(priv->irq, netdev); 1012 ftmac100_free_buffers(priv); 1013 1014 return 0; 1015 } 1016 1017 static netdev_tx_t 1018 ftmac100_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev) 1019 { 1020 struct ftmac100 *priv = netdev_priv(netdev); 1021 dma_addr_t map; 1022 1023 if (unlikely(skb->len > MAX_PKT_SIZE)) { 1024 if (net_ratelimit()) 1025 netdev_dbg(netdev, "tx packet too big\n"); 1026 1027 netdev->stats.tx_dropped++; 1028 dev_kfree_skb(skb); 1029 return NETDEV_TX_OK; 1030 } 1031 1032 map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); 1033 if (unlikely(dma_mapping_error(priv->dev, map))) { 1034 /* drop packet */ 1035 if (net_ratelimit()) 1036 netdev_err(netdev, "map socket buffer failed\n"); 1037 1038 netdev->stats.tx_dropped++; 1039 dev_kfree_skb(skb); 1040 return NETDEV_TX_OK; 1041 } 1042 1043 return ftmac100_xmit(priv, skb, map); 1044 } 1045 1046 /* optional */ 1047 static int ftmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd) 1048 { 1049 struct ftmac100 *priv = netdev_priv(netdev); 1050 struct mii_ioctl_data *data = if_mii(ifr); 1051 1052 return generic_mii_ioctl(&priv->mii, data, cmd, NULL); 1053 } 1054 1055 static const struct net_device_ops ftmac100_netdev_ops = { 1056 .ndo_open = ftmac100_open, 1057 .ndo_stop = ftmac100_stop, 1058 .ndo_start_xmit = ftmac100_hard_start_xmit, 1059 .ndo_set_mac_address = eth_mac_addr, 1060 .ndo_validate_addr = eth_validate_addr, 1061 .ndo_do_ioctl = ftmac100_do_ioctl, 1062 }; 1063 1064 /****************************************************************************** 1065 * struct platform_driver functions 1066 *****************************************************************************/ 1067 static int ftmac100_probe(struct platform_device *pdev) 1068 { 1069 struct resource *res; 1070 int irq; 1071 struct net_device *netdev; 1072 struct ftmac100 *priv; 1073 int err; 1074 1075 if (!pdev) 1076 return -ENODEV; 1077 1078 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1079 if (!res) 1080 return -ENXIO; 1081 1082 irq = platform_get_irq(pdev, 0); 1083 if (irq < 0) 1084 return irq; 1085 1086 /* setup net_device */ 1087 netdev = alloc_etherdev(sizeof(*priv)); 1088 if (!netdev) { 1089 err = -ENOMEM; 1090 goto err_alloc_etherdev; 1091 } 1092 1093 SET_NETDEV_DEV(netdev, &pdev->dev); 1094 netdev->ethtool_ops = &ftmac100_ethtool_ops; 1095 netdev->netdev_ops = &ftmac100_netdev_ops; 1096 1097 platform_set_drvdata(pdev, netdev); 1098 1099 /* setup private data */ 1100 priv = netdev_priv(netdev); 1101 priv->netdev = netdev; 1102 priv->dev = &pdev->dev; 1103 1104 spin_lock_init(&priv->tx_lock); 1105 1106 /* initialize NAPI */ 1107 netif_napi_add(netdev, &priv->napi, ftmac100_poll, 64); 1108 1109 /* map io memory */ 1110 priv->res = request_mem_region(res->start, resource_size(res), 1111 dev_name(&pdev->dev)); 1112 if (!priv->res) { 1113 dev_err(&pdev->dev, "Could not reserve memory region\n"); 1114 err = -ENOMEM; 1115 goto err_req_mem; 1116 } 1117 1118 priv->base = ioremap(res->start, resource_size(res)); 1119 if (!priv->base) { 1120 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n"); 1121 err = -EIO; 1122 goto err_ioremap; 1123 } 1124 1125 priv->irq = irq; 1126 1127 /* initialize struct mii_if_info */ 1128 priv->mii.phy_id = 0; 1129 priv->mii.phy_id_mask = 0x1f; 1130 priv->mii.reg_num_mask = 0x1f; 1131 priv->mii.dev = netdev; 1132 priv->mii.mdio_read = ftmac100_mdio_read; 1133 priv->mii.mdio_write = ftmac100_mdio_write; 1134 1135 /* register network device */ 1136 err = register_netdev(netdev); 1137 if (err) { 1138 dev_err(&pdev->dev, "Failed to register netdev\n"); 1139 goto err_register_netdev; 1140 } 1141 1142 netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base); 1143 1144 if (!is_valid_ether_addr(netdev->dev_addr)) { 1145 eth_hw_addr_random(netdev); 1146 netdev_info(netdev, "generated random MAC address %pM\n", 1147 netdev->dev_addr); 1148 } 1149 1150 return 0; 1151 1152 err_register_netdev: 1153 iounmap(priv->base); 1154 err_ioremap: 1155 release_resource(priv->res); 1156 err_req_mem: 1157 netif_napi_del(&priv->napi); 1158 free_netdev(netdev); 1159 err_alloc_etherdev: 1160 return err; 1161 } 1162 1163 static int ftmac100_remove(struct platform_device *pdev) 1164 { 1165 struct net_device *netdev; 1166 struct ftmac100 *priv; 1167 1168 netdev = platform_get_drvdata(pdev); 1169 priv = netdev_priv(netdev); 1170 1171 unregister_netdev(netdev); 1172 1173 iounmap(priv->base); 1174 release_resource(priv->res); 1175 1176 netif_napi_del(&priv->napi); 1177 free_netdev(netdev); 1178 return 0; 1179 } 1180 1181 static const struct of_device_id ftmac100_of_ids[] = { 1182 { .compatible = "andestech,atmac100" }, 1183 { } 1184 }; 1185 1186 static struct platform_driver ftmac100_driver = { 1187 .probe = ftmac100_probe, 1188 .remove = ftmac100_remove, 1189 .driver = { 1190 .name = DRV_NAME, 1191 .of_match_table = ftmac100_of_ids 1192 }, 1193 }; 1194 1195 /****************************************************************************** 1196 * initialization / finalization 1197 *****************************************************************************/ 1198 static int __init ftmac100_init(void) 1199 { 1200 pr_info("Loading version " DRV_VERSION " ...\n"); 1201 return platform_driver_register(&ftmac100_driver); 1202 } 1203 1204 static void __exit ftmac100_exit(void) 1205 { 1206 platform_driver_unregister(&ftmac100_driver); 1207 } 1208 1209 module_init(ftmac100_init); 1210 module_exit(ftmac100_exit); 1211 1212 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>"); 1213 MODULE_DESCRIPTION("FTMAC100 driver"); 1214 MODULE_LICENSE("GPL"); 1215 MODULE_DEVICE_TABLE(of, ftmac100_of_ids); 1216