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/netdevice.h> 33 #include <linux/platform_device.h> 34 35 #include "ftmac100.h" 36 37 #define DRV_NAME "ftmac100" 38 #define DRV_VERSION "0.2" 39 40 #define RX_QUEUE_ENTRIES 128 /* must be power of 2 */ 41 #define TX_QUEUE_ENTRIES 16 /* must be power of 2 */ 42 43 #define MAX_PKT_SIZE 1518 44 #define RX_BUF_SIZE 2044 /* must be smaller than 0x7ff */ 45 46 #if MAX_PKT_SIZE > 0x7ff 47 #error invalid MAX_PKT_SIZE 48 #endif 49 50 #if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE 51 #error invalid RX_BUF_SIZE 52 #endif 53 54 /****************************************************************************** 55 * private data 56 *****************************************************************************/ 57 struct ftmac100_descs { 58 struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES]; 59 struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES]; 60 }; 61 62 struct ftmac100 { 63 struct resource *res; 64 void __iomem *base; 65 int irq; 66 67 struct ftmac100_descs *descs; 68 dma_addr_t descs_dma_addr; 69 70 unsigned int rx_pointer; 71 unsigned int tx_clean_pointer; 72 unsigned int tx_pointer; 73 unsigned int tx_pending; 74 75 spinlock_t tx_lock; 76 77 struct net_device *netdev; 78 struct device *dev; 79 struct napi_struct napi; 80 81 struct mii_if_info mii; 82 }; 83 84 static int ftmac100_alloc_rx_page(struct ftmac100 *priv, 85 struct ftmac100_rxdes *rxdes, gfp_t gfp); 86 87 /****************************************************************************** 88 * internal functions (hardware register access) 89 *****************************************************************************/ 90 #define INT_MASK_ALL_ENABLED (FTMAC100_INT_RPKT_FINISH | \ 91 FTMAC100_INT_NORXBUF | \ 92 FTMAC100_INT_XPKT_OK | \ 93 FTMAC100_INT_XPKT_LOST | \ 94 FTMAC100_INT_RPKT_LOST | \ 95 FTMAC100_INT_AHB_ERR | \ 96 FTMAC100_INT_PHYSTS_CHG) 97 98 #define INT_MASK_ALL_DISABLED 0 99 100 static void ftmac100_enable_all_int(struct ftmac100 *priv) 101 { 102 iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR); 103 } 104 105 static void ftmac100_disable_all_int(struct ftmac100 *priv) 106 { 107 iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR); 108 } 109 110 static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr) 111 { 112 iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR); 113 } 114 115 static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr) 116 { 117 iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR); 118 } 119 120 static void ftmac100_txdma_start_polling(struct ftmac100 *priv) 121 { 122 iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD); 123 } 124 125 static int ftmac100_reset(struct ftmac100 *priv) 126 { 127 struct net_device *netdev = priv->netdev; 128 int i; 129 130 /* NOTE: reset clears all registers */ 131 iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR); 132 133 for (i = 0; i < 5; i++) { 134 unsigned int maccr; 135 136 maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR); 137 if (!(maccr & FTMAC100_MACCR_SW_RST)) { 138 /* 139 * FTMAC100_MACCR_SW_RST cleared does not indicate 140 * that hardware reset completed (what the f*ck). 141 * We still need to wait for a while. 142 */ 143 udelay(500); 144 return 0; 145 } 146 147 udelay(1000); 148 } 149 150 netdev_err(netdev, "software reset failed\n"); 151 return -EIO; 152 } 153 154 static void ftmac100_set_mac(struct ftmac100 *priv, const unsigned char *mac) 155 { 156 unsigned int maddr = mac[0] << 8 | mac[1]; 157 unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5]; 158 159 iowrite32(maddr, priv->base + FTMAC100_OFFSET_MAC_MADR); 160 iowrite32(laddr, priv->base + FTMAC100_OFFSET_MAC_LADR); 161 } 162 163 #define MACCR_ENABLE_ALL (FTMAC100_MACCR_XMT_EN | \ 164 FTMAC100_MACCR_RCV_EN | \ 165 FTMAC100_MACCR_XDMA_EN | \ 166 FTMAC100_MACCR_RDMA_EN | \ 167 FTMAC100_MACCR_CRC_APD | \ 168 FTMAC100_MACCR_FULLDUP | \ 169 FTMAC100_MACCR_RX_RUNT | \ 170 FTMAC100_MACCR_RX_BROADPKT) 171 172 static int ftmac100_start_hw(struct ftmac100 *priv) 173 { 174 struct net_device *netdev = priv->netdev; 175 176 if (ftmac100_reset(priv)) 177 return -EIO; 178 179 /* setup ring buffer base registers */ 180 ftmac100_set_rx_ring_base(priv, 181 priv->descs_dma_addr + 182 offsetof(struct ftmac100_descs, rxdes)); 183 ftmac100_set_tx_ring_base(priv, 184 priv->descs_dma_addr + 185 offsetof(struct ftmac100_descs, txdes)); 186 187 iowrite32(FTMAC100_APTC_RXPOLL_CNT(1), priv->base + FTMAC100_OFFSET_APTC); 188 189 ftmac100_set_mac(priv, netdev->dev_addr); 190 191 iowrite32(MACCR_ENABLE_ALL, priv->base + FTMAC100_OFFSET_MACCR); 192 return 0; 193 } 194 195 static void ftmac100_stop_hw(struct ftmac100 *priv) 196 { 197 iowrite32(0, priv->base + FTMAC100_OFFSET_MACCR); 198 } 199 200 /****************************************************************************** 201 * internal functions (receive descriptor) 202 *****************************************************************************/ 203 static bool ftmac100_rxdes_first_segment(struct ftmac100_rxdes *rxdes) 204 { 205 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FRS); 206 } 207 208 static bool ftmac100_rxdes_last_segment(struct ftmac100_rxdes *rxdes) 209 { 210 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_LRS); 211 } 212 213 static bool ftmac100_rxdes_owned_by_dma(struct ftmac100_rxdes *rxdes) 214 { 215 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN); 216 } 217 218 static void ftmac100_rxdes_set_dma_own(struct ftmac100_rxdes *rxdes) 219 { 220 /* clear status bits */ 221 rxdes->rxdes0 = cpu_to_le32(FTMAC100_RXDES0_RXDMA_OWN); 222 } 223 224 static bool ftmac100_rxdes_rx_error(struct ftmac100_rxdes *rxdes) 225 { 226 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ERR); 227 } 228 229 static bool ftmac100_rxdes_crc_error(struct ftmac100_rxdes *rxdes) 230 { 231 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_CRC_ERR); 232 } 233 234 static bool ftmac100_rxdes_frame_too_long(struct ftmac100_rxdes *rxdes) 235 { 236 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_FTL); 237 } 238 239 static bool ftmac100_rxdes_runt(struct ftmac100_rxdes *rxdes) 240 { 241 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RUNT); 242 } 243 244 static bool ftmac100_rxdes_odd_nibble(struct ftmac100_rxdes *rxdes) 245 { 246 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ODD_NB); 247 } 248 249 static unsigned int ftmac100_rxdes_frame_length(struct ftmac100_rxdes *rxdes) 250 { 251 return le32_to_cpu(rxdes->rxdes0) & FTMAC100_RXDES0_RFL; 252 } 253 254 static bool ftmac100_rxdes_multicast(struct ftmac100_rxdes *rxdes) 255 { 256 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_MULTICAST); 257 } 258 259 static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes, 260 unsigned int size) 261 { 262 rxdes->rxdes1 &= cpu_to_le32(FTMAC100_RXDES1_EDORR); 263 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_RXBUF_SIZE(size)); 264 } 265 266 static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes) 267 { 268 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_EDORR); 269 } 270 271 static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes, 272 dma_addr_t addr) 273 { 274 rxdes->rxdes2 = cpu_to_le32(addr); 275 } 276 277 static dma_addr_t ftmac100_rxdes_get_dma_addr(struct ftmac100_rxdes *rxdes) 278 { 279 return le32_to_cpu(rxdes->rxdes2); 280 } 281 282 /* 283 * rxdes3 is not used by hardware. We use it to keep track of page. 284 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu(). 285 */ 286 static void ftmac100_rxdes_set_page(struct ftmac100_rxdes *rxdes, struct page *page) 287 { 288 rxdes->rxdes3 = (unsigned int)page; 289 } 290 291 static struct page *ftmac100_rxdes_get_page(struct ftmac100_rxdes *rxdes) 292 { 293 return (struct page *)rxdes->rxdes3; 294 } 295 296 /****************************************************************************** 297 * internal functions (receive) 298 *****************************************************************************/ 299 static int ftmac100_next_rx_pointer(int pointer) 300 { 301 return (pointer + 1) & (RX_QUEUE_ENTRIES - 1); 302 } 303 304 static void ftmac100_rx_pointer_advance(struct ftmac100 *priv) 305 { 306 priv->rx_pointer = ftmac100_next_rx_pointer(priv->rx_pointer); 307 } 308 309 static struct ftmac100_rxdes *ftmac100_current_rxdes(struct ftmac100 *priv) 310 { 311 return &priv->descs->rxdes[priv->rx_pointer]; 312 } 313 314 static struct ftmac100_rxdes * 315 ftmac100_rx_locate_first_segment(struct ftmac100 *priv) 316 { 317 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv); 318 319 while (!ftmac100_rxdes_owned_by_dma(rxdes)) { 320 if (ftmac100_rxdes_first_segment(rxdes)) 321 return rxdes; 322 323 ftmac100_rxdes_set_dma_own(rxdes); 324 ftmac100_rx_pointer_advance(priv); 325 rxdes = ftmac100_current_rxdes(priv); 326 } 327 328 return NULL; 329 } 330 331 static bool ftmac100_rx_packet_error(struct ftmac100 *priv, 332 struct ftmac100_rxdes *rxdes) 333 { 334 struct net_device *netdev = priv->netdev; 335 bool error = false; 336 337 if (unlikely(ftmac100_rxdes_rx_error(rxdes))) { 338 if (net_ratelimit()) 339 netdev_info(netdev, "rx err\n"); 340 341 netdev->stats.rx_errors++; 342 error = true; 343 } 344 345 if (unlikely(ftmac100_rxdes_crc_error(rxdes))) { 346 if (net_ratelimit()) 347 netdev_info(netdev, "rx crc err\n"); 348 349 netdev->stats.rx_crc_errors++; 350 error = true; 351 } 352 353 if (unlikely(ftmac100_rxdes_frame_too_long(rxdes))) { 354 if (net_ratelimit()) 355 netdev_info(netdev, "rx frame too long\n"); 356 357 netdev->stats.rx_length_errors++; 358 error = true; 359 } else if (unlikely(ftmac100_rxdes_runt(rxdes))) { 360 if (net_ratelimit()) 361 netdev_info(netdev, "rx runt\n"); 362 363 netdev->stats.rx_length_errors++; 364 error = true; 365 } else if (unlikely(ftmac100_rxdes_odd_nibble(rxdes))) { 366 if (net_ratelimit()) 367 netdev_info(netdev, "rx odd nibble\n"); 368 369 netdev->stats.rx_length_errors++; 370 error = true; 371 } 372 373 return error; 374 } 375 376 static void ftmac100_rx_drop_packet(struct ftmac100 *priv) 377 { 378 struct net_device *netdev = priv->netdev; 379 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv); 380 bool done = false; 381 382 if (net_ratelimit()) 383 netdev_dbg(netdev, "drop packet %p\n", rxdes); 384 385 do { 386 if (ftmac100_rxdes_last_segment(rxdes)) 387 done = true; 388 389 ftmac100_rxdes_set_dma_own(rxdes); 390 ftmac100_rx_pointer_advance(priv); 391 rxdes = ftmac100_current_rxdes(priv); 392 } while (!done && !ftmac100_rxdes_owned_by_dma(rxdes)); 393 394 netdev->stats.rx_dropped++; 395 } 396 397 static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed) 398 { 399 struct net_device *netdev = priv->netdev; 400 struct ftmac100_rxdes *rxdes; 401 struct sk_buff *skb; 402 struct page *page; 403 dma_addr_t map; 404 int length; 405 bool ret; 406 407 rxdes = ftmac100_rx_locate_first_segment(priv); 408 if (!rxdes) 409 return false; 410 411 if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) { 412 ftmac100_rx_drop_packet(priv); 413 return true; 414 } 415 416 /* 417 * It is impossible to get multi-segment packets 418 * because we always provide big enough receive buffers. 419 */ 420 ret = ftmac100_rxdes_last_segment(rxdes); 421 BUG_ON(!ret); 422 423 /* start processing */ 424 skb = netdev_alloc_skb_ip_align(netdev, 128); 425 if (unlikely(!skb)) { 426 if (net_ratelimit()) 427 netdev_err(netdev, "rx skb alloc failed\n"); 428 429 ftmac100_rx_drop_packet(priv); 430 return true; 431 } 432 433 if (unlikely(ftmac100_rxdes_multicast(rxdes))) 434 netdev->stats.multicast++; 435 436 map = ftmac100_rxdes_get_dma_addr(rxdes); 437 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE); 438 439 length = ftmac100_rxdes_frame_length(rxdes); 440 page = ftmac100_rxdes_get_page(rxdes); 441 skb_fill_page_desc(skb, 0, page, 0, length); 442 skb->len += length; 443 skb->data_len += length; 444 445 if (length > 128) { 446 skb->truesize += PAGE_SIZE; 447 /* We pull the minimum amount into linear part */ 448 __pskb_pull_tail(skb, ETH_HLEN); 449 } else { 450 /* Small frames are copied into linear part to free one page */ 451 __pskb_pull_tail(skb, length); 452 } 453 ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC); 454 455 ftmac100_rx_pointer_advance(priv); 456 457 skb->protocol = eth_type_trans(skb, netdev); 458 459 netdev->stats.rx_packets++; 460 netdev->stats.rx_bytes += skb->len; 461 462 /* push packet to protocol stack */ 463 netif_receive_skb(skb); 464 465 (*processed)++; 466 return true; 467 } 468 469 /****************************************************************************** 470 * internal functions (transmit descriptor) 471 *****************************************************************************/ 472 static void ftmac100_txdes_reset(struct ftmac100_txdes *txdes) 473 { 474 /* clear all except end of ring bit */ 475 txdes->txdes0 = 0; 476 txdes->txdes1 &= cpu_to_le32(FTMAC100_TXDES1_EDOTR); 477 txdes->txdes2 = 0; 478 txdes->txdes3 = 0; 479 } 480 481 static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes) 482 { 483 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN); 484 } 485 486 static void ftmac100_txdes_set_dma_own(struct ftmac100_txdes *txdes) 487 { 488 /* 489 * Make sure dma own bit will not be set before any other 490 * descriptor fields. 491 */ 492 wmb(); 493 txdes->txdes0 |= cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN); 494 } 495 496 static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes) 497 { 498 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_EXSCOL); 499 } 500 501 static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes) 502 { 503 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_LATECOL); 504 } 505 506 static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes) 507 { 508 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_EDOTR); 509 } 510 511 static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes) 512 { 513 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_FTS); 514 } 515 516 static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes) 517 { 518 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_LTS); 519 } 520 521 static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes) 522 { 523 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXIC); 524 } 525 526 static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes, 527 unsigned int len) 528 { 529 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXBUF_SIZE(len)); 530 } 531 532 static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes, 533 dma_addr_t addr) 534 { 535 txdes->txdes2 = cpu_to_le32(addr); 536 } 537 538 static dma_addr_t ftmac100_txdes_get_dma_addr(struct ftmac100_txdes *txdes) 539 { 540 return le32_to_cpu(txdes->txdes2); 541 } 542 543 /* 544 * txdes3 is not used by hardware. We use it to keep track of socket buffer. 545 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu(). 546 */ 547 static void ftmac100_txdes_set_skb(struct ftmac100_txdes *txdes, struct sk_buff *skb) 548 { 549 txdes->txdes3 = (unsigned int)skb; 550 } 551 552 static struct sk_buff *ftmac100_txdes_get_skb(struct ftmac100_txdes *txdes) 553 { 554 return (struct sk_buff *)txdes->txdes3; 555 } 556 557 /****************************************************************************** 558 * internal functions (transmit) 559 *****************************************************************************/ 560 static int ftmac100_next_tx_pointer(int pointer) 561 { 562 return (pointer + 1) & (TX_QUEUE_ENTRIES - 1); 563 } 564 565 static void ftmac100_tx_pointer_advance(struct ftmac100 *priv) 566 { 567 priv->tx_pointer = ftmac100_next_tx_pointer(priv->tx_pointer); 568 } 569 570 static void ftmac100_tx_clean_pointer_advance(struct ftmac100 *priv) 571 { 572 priv->tx_clean_pointer = ftmac100_next_tx_pointer(priv->tx_clean_pointer); 573 } 574 575 static struct ftmac100_txdes *ftmac100_current_txdes(struct ftmac100 *priv) 576 { 577 return &priv->descs->txdes[priv->tx_pointer]; 578 } 579 580 static struct ftmac100_txdes *ftmac100_current_clean_txdes(struct ftmac100 *priv) 581 { 582 return &priv->descs->txdes[priv->tx_clean_pointer]; 583 } 584 585 static bool ftmac100_tx_complete_packet(struct ftmac100 *priv) 586 { 587 struct net_device *netdev = priv->netdev; 588 struct ftmac100_txdes *txdes; 589 struct sk_buff *skb; 590 dma_addr_t map; 591 592 if (priv->tx_pending == 0) 593 return false; 594 595 txdes = ftmac100_current_clean_txdes(priv); 596 597 if (ftmac100_txdes_owned_by_dma(txdes)) 598 return false; 599 600 skb = ftmac100_txdes_get_skb(txdes); 601 map = ftmac100_txdes_get_dma_addr(txdes); 602 603 if (unlikely(ftmac100_txdes_excessive_collision(txdes) || 604 ftmac100_txdes_late_collision(txdes))) { 605 /* 606 * packet transmitted to ethernet lost due to late collision 607 * or excessive collision 608 */ 609 netdev->stats.tx_aborted_errors++; 610 } else { 611 netdev->stats.tx_packets++; 612 netdev->stats.tx_bytes += skb->len; 613 } 614 615 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE); 616 dev_kfree_skb(skb); 617 618 ftmac100_txdes_reset(txdes); 619 620 ftmac100_tx_clean_pointer_advance(priv); 621 622 spin_lock(&priv->tx_lock); 623 priv->tx_pending--; 624 spin_unlock(&priv->tx_lock); 625 netif_wake_queue(netdev); 626 627 return true; 628 } 629 630 static void ftmac100_tx_complete(struct ftmac100 *priv) 631 { 632 while (ftmac100_tx_complete_packet(priv)) 633 ; 634 } 635 636 static int ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb, 637 dma_addr_t map) 638 { 639 struct net_device *netdev = priv->netdev; 640 struct ftmac100_txdes *txdes; 641 unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len; 642 643 txdes = ftmac100_current_txdes(priv); 644 ftmac100_tx_pointer_advance(priv); 645 646 /* setup TX descriptor */ 647 ftmac100_txdes_set_skb(txdes, skb); 648 ftmac100_txdes_set_dma_addr(txdes, map); 649 650 ftmac100_txdes_set_first_segment(txdes); 651 ftmac100_txdes_set_last_segment(txdes); 652 ftmac100_txdes_set_txint(txdes); 653 ftmac100_txdes_set_buffer_size(txdes, len); 654 655 spin_lock(&priv->tx_lock); 656 priv->tx_pending++; 657 if (priv->tx_pending == TX_QUEUE_ENTRIES) 658 netif_stop_queue(netdev); 659 660 /* start transmit */ 661 ftmac100_txdes_set_dma_own(txdes); 662 spin_unlock(&priv->tx_lock); 663 664 ftmac100_txdma_start_polling(priv); 665 return NETDEV_TX_OK; 666 } 667 668 /****************************************************************************** 669 * internal functions (buffer) 670 *****************************************************************************/ 671 static int ftmac100_alloc_rx_page(struct ftmac100 *priv, 672 struct ftmac100_rxdes *rxdes, gfp_t gfp) 673 { 674 struct net_device *netdev = priv->netdev; 675 struct page *page; 676 dma_addr_t map; 677 678 page = alloc_page(gfp); 679 if (!page) { 680 if (net_ratelimit()) 681 netdev_err(netdev, "failed to allocate rx page\n"); 682 return -ENOMEM; 683 } 684 685 map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE); 686 if (unlikely(dma_mapping_error(priv->dev, map))) { 687 if (net_ratelimit()) 688 netdev_err(netdev, "failed to map rx page\n"); 689 __free_page(page); 690 return -ENOMEM; 691 } 692 693 ftmac100_rxdes_set_page(rxdes, page); 694 ftmac100_rxdes_set_dma_addr(rxdes, map); 695 ftmac100_rxdes_set_buffer_size(rxdes, RX_BUF_SIZE); 696 ftmac100_rxdes_set_dma_own(rxdes); 697 return 0; 698 } 699 700 static void ftmac100_free_buffers(struct ftmac100 *priv) 701 { 702 int i; 703 704 for (i = 0; i < RX_QUEUE_ENTRIES; i++) { 705 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i]; 706 struct page *page = ftmac100_rxdes_get_page(rxdes); 707 dma_addr_t map = ftmac100_rxdes_get_dma_addr(rxdes); 708 709 if (!page) 710 continue; 711 712 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE); 713 __free_page(page); 714 } 715 716 for (i = 0; i < TX_QUEUE_ENTRIES; i++) { 717 struct ftmac100_txdes *txdes = &priv->descs->txdes[i]; 718 struct sk_buff *skb = ftmac100_txdes_get_skb(txdes); 719 dma_addr_t map = ftmac100_txdes_get_dma_addr(txdes); 720 721 if (!skb) 722 continue; 723 724 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE); 725 dev_kfree_skb(skb); 726 } 727 728 dma_free_coherent(priv->dev, sizeof(struct ftmac100_descs), 729 priv->descs, priv->descs_dma_addr); 730 } 731 732 static int ftmac100_alloc_buffers(struct ftmac100 *priv) 733 { 734 int i; 735 736 priv->descs = dma_zalloc_coherent(priv->dev, 737 sizeof(struct ftmac100_descs), 738 &priv->descs_dma_addr, 739 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 if (likely(netif_running(netdev))) { 875 /* Disable interrupts for polling */ 876 ftmac100_disable_all_int(priv); 877 napi_schedule(&priv->napi); 878 } 879 880 return IRQ_HANDLED; 881 } 882 883 /****************************************************************************** 884 * struct napi_struct functions 885 *****************************************************************************/ 886 static int ftmac100_poll(struct napi_struct *napi, int budget) 887 { 888 struct ftmac100 *priv = container_of(napi, struct ftmac100, napi); 889 struct net_device *netdev = priv->netdev; 890 unsigned int status; 891 bool completed = true; 892 int rx = 0; 893 894 status = ioread32(priv->base + FTMAC100_OFFSET_ISR); 895 896 if (status & (FTMAC100_INT_RPKT_FINISH | FTMAC100_INT_NORXBUF)) { 897 /* 898 * FTMAC100_INT_RPKT_FINISH: 899 * RX DMA has received packets into RX buffer successfully 900 * 901 * FTMAC100_INT_NORXBUF: 902 * RX buffer unavailable 903 */ 904 bool retry; 905 906 do { 907 retry = ftmac100_rx_packet(priv, &rx); 908 } while (retry && rx < budget); 909 910 if (retry && rx == budget) 911 completed = false; 912 } 913 914 if (status & (FTMAC100_INT_XPKT_OK | FTMAC100_INT_XPKT_LOST)) { 915 /* 916 * FTMAC100_INT_XPKT_OK: 917 * packet transmitted to ethernet successfully 918 * 919 * FTMAC100_INT_XPKT_LOST: 920 * packet transmitted to ethernet lost due to late 921 * collision or excessive collision 922 */ 923 ftmac100_tx_complete(priv); 924 } 925 926 if (status & (FTMAC100_INT_NORXBUF | FTMAC100_INT_RPKT_LOST | 927 FTMAC100_INT_AHB_ERR | FTMAC100_INT_PHYSTS_CHG)) { 928 if (net_ratelimit()) 929 netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status, 930 status & FTMAC100_INT_NORXBUF ? "NORXBUF " : "", 931 status & FTMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "", 932 status & FTMAC100_INT_AHB_ERR ? "AHB_ERR " : "", 933 status & FTMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : ""); 934 935 if (status & FTMAC100_INT_NORXBUF) { 936 /* RX buffer unavailable */ 937 netdev->stats.rx_over_errors++; 938 } 939 940 if (status & FTMAC100_INT_RPKT_LOST) { 941 /* received packet lost due to RX FIFO full */ 942 netdev->stats.rx_fifo_errors++; 943 } 944 945 if (status & FTMAC100_INT_PHYSTS_CHG) { 946 /* PHY link status change */ 947 mii_check_link(&priv->mii); 948 } 949 } 950 951 if (completed) { 952 /* stop polling */ 953 napi_complete(napi); 954 ftmac100_enable_all_int(priv); 955 } 956 957 return rx; 958 } 959 960 /****************************************************************************** 961 * struct net_device_ops functions 962 *****************************************************************************/ 963 static int ftmac100_open(struct net_device *netdev) 964 { 965 struct ftmac100 *priv = netdev_priv(netdev); 966 int err; 967 968 err = ftmac100_alloc_buffers(priv); 969 if (err) { 970 netdev_err(netdev, "failed to allocate buffers\n"); 971 goto err_alloc; 972 } 973 974 err = request_irq(priv->irq, ftmac100_interrupt, 0, netdev->name, netdev); 975 if (err) { 976 netdev_err(netdev, "failed to request irq %d\n", priv->irq); 977 goto err_irq; 978 } 979 980 priv->rx_pointer = 0; 981 priv->tx_clean_pointer = 0; 982 priv->tx_pointer = 0; 983 priv->tx_pending = 0; 984 985 err = ftmac100_start_hw(priv); 986 if (err) 987 goto err_hw; 988 989 napi_enable(&priv->napi); 990 netif_start_queue(netdev); 991 992 ftmac100_enable_all_int(priv); 993 994 return 0; 995 996 err_hw: 997 free_irq(priv->irq, netdev); 998 err_irq: 999 ftmac100_free_buffers(priv); 1000 err_alloc: 1001 return err; 1002 } 1003 1004 static int ftmac100_stop(struct net_device *netdev) 1005 { 1006 struct ftmac100 *priv = netdev_priv(netdev); 1007 1008 ftmac100_disable_all_int(priv); 1009 netif_stop_queue(netdev); 1010 napi_disable(&priv->napi); 1011 ftmac100_stop_hw(priv); 1012 free_irq(priv->irq, netdev); 1013 ftmac100_free_buffers(priv); 1014 1015 return 0; 1016 } 1017 1018 static int 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