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/if_ether.h> 15 #include <linux/if_vlan.h> 16 #include <linux/init.h> 17 #include <linux/interrupt.h> 18 #include <linux/io.h> 19 #include <linux/mii.h> 20 #include <linux/module.h> 21 #include <linux/mod_devicetable.h> 22 #include <linux/netdevice.h> 23 #include <linux/platform_device.h> 24 25 #include "ftmac100.h" 26 27 #define DRV_NAME "ftmac100" 28 29 #define RX_QUEUE_ENTRIES 128 /* must be power of 2 */ 30 #define TX_QUEUE_ENTRIES 16 /* must be power of 2 */ 31 32 #define RX_BUF_SIZE 2044 /* must be smaller than 0x7ff */ 33 #define MAX_PKT_SIZE RX_BUF_SIZE /* multi-segment not supported */ 34 35 #if MAX_PKT_SIZE > 0x7ff 36 #error invalid MAX_PKT_SIZE 37 #endif 38 39 #if RX_BUF_SIZE > 0x7ff || RX_BUF_SIZE > PAGE_SIZE 40 #error invalid RX_BUF_SIZE 41 #endif 42 43 /****************************************************************************** 44 * private data 45 *****************************************************************************/ 46 struct ftmac100_descs { 47 struct ftmac100_rxdes rxdes[RX_QUEUE_ENTRIES]; 48 struct ftmac100_txdes txdes[TX_QUEUE_ENTRIES]; 49 }; 50 51 struct ftmac100 { 52 struct resource *res; 53 void __iomem *base; 54 int irq; 55 56 struct ftmac100_descs *descs; 57 dma_addr_t descs_dma_addr; 58 59 unsigned int rx_pointer; 60 unsigned int tx_clean_pointer; 61 unsigned int tx_pointer; 62 unsigned int tx_pending; 63 64 spinlock_t tx_lock; 65 66 struct net_device *netdev; 67 struct device *dev; 68 struct napi_struct napi; 69 70 struct mii_if_info mii; 71 }; 72 73 static int ftmac100_alloc_rx_page(struct ftmac100 *priv, 74 struct ftmac100_rxdes *rxdes, gfp_t gfp); 75 76 /****************************************************************************** 77 * internal functions (hardware register access) 78 *****************************************************************************/ 79 #define INT_MASK_ALL_ENABLED (FTMAC100_INT_RPKT_FINISH | \ 80 FTMAC100_INT_NORXBUF | \ 81 FTMAC100_INT_XPKT_OK | \ 82 FTMAC100_INT_XPKT_LOST | \ 83 FTMAC100_INT_RPKT_LOST | \ 84 FTMAC100_INT_AHB_ERR | \ 85 FTMAC100_INT_PHYSTS_CHG) 86 87 #define INT_MASK_ALL_DISABLED 0 88 89 static void ftmac100_enable_all_int(struct ftmac100 *priv) 90 { 91 iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTMAC100_OFFSET_IMR); 92 } 93 94 static void ftmac100_disable_all_int(struct ftmac100 *priv) 95 { 96 iowrite32(INT_MASK_ALL_DISABLED, priv->base + FTMAC100_OFFSET_IMR); 97 } 98 99 static void ftmac100_set_rx_ring_base(struct ftmac100 *priv, dma_addr_t addr) 100 { 101 iowrite32(addr, priv->base + FTMAC100_OFFSET_RXR_BADR); 102 } 103 104 static void ftmac100_set_tx_ring_base(struct ftmac100 *priv, dma_addr_t addr) 105 { 106 iowrite32(addr, priv->base + FTMAC100_OFFSET_TXR_BADR); 107 } 108 109 static void ftmac100_txdma_start_polling(struct ftmac100 *priv) 110 { 111 iowrite32(1, priv->base + FTMAC100_OFFSET_TXPD); 112 } 113 114 static int ftmac100_reset(struct ftmac100 *priv) 115 { 116 struct net_device *netdev = priv->netdev; 117 int i; 118 119 /* NOTE: reset clears all registers */ 120 iowrite32(FTMAC100_MACCR_SW_RST, priv->base + FTMAC100_OFFSET_MACCR); 121 122 for (i = 0; i < 5; i++) { 123 unsigned int maccr; 124 125 maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR); 126 if (!(maccr & FTMAC100_MACCR_SW_RST)) { 127 /* 128 * FTMAC100_MACCR_SW_RST cleared does not indicate 129 * that hardware reset completed (what the f*ck). 130 * We still need to wait for a while. 131 */ 132 udelay(500); 133 return 0; 134 } 135 136 udelay(1000); 137 } 138 139 netdev_err(netdev, "software reset failed\n"); 140 return -EIO; 141 } 142 143 static void ftmac100_set_mac(struct ftmac100 *priv, const unsigned char *mac) 144 { 145 unsigned int maddr = mac[0] << 8 | mac[1]; 146 unsigned int laddr = mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5]; 147 148 iowrite32(maddr, priv->base + FTMAC100_OFFSET_MAC_MADR); 149 iowrite32(laddr, priv->base + FTMAC100_OFFSET_MAC_LADR); 150 } 151 152 #define MACCR_ENABLE_ALL (FTMAC100_MACCR_XMT_EN | \ 153 FTMAC100_MACCR_RCV_EN | \ 154 FTMAC100_MACCR_XDMA_EN | \ 155 FTMAC100_MACCR_RDMA_EN | \ 156 FTMAC100_MACCR_CRC_APD | \ 157 FTMAC100_MACCR_FULLDUP | \ 158 FTMAC100_MACCR_RX_RUNT | \ 159 FTMAC100_MACCR_RX_BROADPKT) 160 161 static int ftmac100_start_hw(struct ftmac100 *priv) 162 { 163 struct net_device *netdev = priv->netdev; 164 unsigned int maccr = MACCR_ENABLE_ALL; 165 166 if (ftmac100_reset(priv)) 167 return -EIO; 168 169 /* setup ring buffer base registers */ 170 ftmac100_set_rx_ring_base(priv, 171 priv->descs_dma_addr + 172 offsetof(struct ftmac100_descs, rxdes)); 173 ftmac100_set_tx_ring_base(priv, 174 priv->descs_dma_addr + 175 offsetof(struct ftmac100_descs, txdes)); 176 177 iowrite32(FTMAC100_APTC_RXPOLL_CNT(1), priv->base + FTMAC100_OFFSET_APTC); 178 179 ftmac100_set_mac(priv, netdev->dev_addr); 180 181 /* See ftmac100_change_mtu() */ 182 if (netdev->mtu > ETH_DATA_LEN) 183 maccr |= FTMAC100_MACCR_RX_FTL; 184 185 /* Add other bits as needed */ 186 if (netdev->flags & IFF_PROMISC) 187 maccr |= FTMAC100_MACCR_RCV_ALL; 188 if (netdev->flags & IFF_ALLMULTI) 189 maccr |= FTMAC100_MACCR_RX_MULTIPKT; 190 191 iowrite32(maccr, 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_runt(struct ftmac100_rxdes *rxdes) 235 { 236 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RUNT); 237 } 238 239 static bool ftmac100_rxdes_odd_nibble(struct ftmac100_rxdes *rxdes) 240 { 241 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_RX_ODD_NB); 242 } 243 244 static unsigned int ftmac100_rxdes_frame_length(struct ftmac100_rxdes *rxdes) 245 { 246 return le32_to_cpu(rxdes->rxdes0) & FTMAC100_RXDES0_RFL; 247 } 248 249 static bool ftmac100_rxdes_multicast(struct ftmac100_rxdes *rxdes) 250 { 251 return rxdes->rxdes0 & cpu_to_le32(FTMAC100_RXDES0_MULTICAST); 252 } 253 254 static void ftmac100_rxdes_set_buffer_size(struct ftmac100_rxdes *rxdes, 255 unsigned int size) 256 { 257 rxdes->rxdes1 &= cpu_to_le32(FTMAC100_RXDES1_EDORR); 258 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_RXBUF_SIZE(size)); 259 } 260 261 static void ftmac100_rxdes_set_end_of_ring(struct ftmac100_rxdes *rxdes) 262 { 263 rxdes->rxdes1 |= cpu_to_le32(FTMAC100_RXDES1_EDORR); 264 } 265 266 static void ftmac100_rxdes_set_dma_addr(struct ftmac100_rxdes *rxdes, 267 dma_addr_t addr) 268 { 269 rxdes->rxdes2 = cpu_to_le32(addr); 270 } 271 272 static dma_addr_t ftmac100_rxdes_get_dma_addr(struct ftmac100_rxdes *rxdes) 273 { 274 return le32_to_cpu(rxdes->rxdes2); 275 } 276 277 /* 278 * rxdes3 is not used by hardware. We use it to keep track of page. 279 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu(). 280 */ 281 static void ftmac100_rxdes_set_page(struct ftmac100_rxdes *rxdes, struct page *page) 282 { 283 rxdes->rxdes3 = (unsigned int)page; 284 } 285 286 static struct page *ftmac100_rxdes_get_page(struct ftmac100_rxdes *rxdes) 287 { 288 return (struct page *)rxdes->rxdes3; 289 } 290 291 /****************************************************************************** 292 * internal functions (receive) 293 *****************************************************************************/ 294 static int ftmac100_next_rx_pointer(int pointer) 295 { 296 return (pointer + 1) & (RX_QUEUE_ENTRIES - 1); 297 } 298 299 static void ftmac100_rx_pointer_advance(struct ftmac100 *priv) 300 { 301 priv->rx_pointer = ftmac100_next_rx_pointer(priv->rx_pointer); 302 } 303 304 static struct ftmac100_rxdes *ftmac100_current_rxdes(struct ftmac100 *priv) 305 { 306 return &priv->descs->rxdes[priv->rx_pointer]; 307 } 308 309 static struct ftmac100_rxdes * 310 ftmac100_rx_locate_first_segment(struct ftmac100 *priv) 311 { 312 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv); 313 314 while (!ftmac100_rxdes_owned_by_dma(rxdes)) { 315 if (ftmac100_rxdes_first_segment(rxdes)) 316 return rxdes; 317 318 ftmac100_rxdes_set_dma_own(rxdes); 319 ftmac100_rx_pointer_advance(priv); 320 rxdes = ftmac100_current_rxdes(priv); 321 } 322 323 return NULL; 324 } 325 326 static bool ftmac100_rx_packet_error(struct ftmac100 *priv, 327 struct ftmac100_rxdes *rxdes) 328 { 329 struct net_device *netdev = priv->netdev; 330 bool error = false; 331 332 if (unlikely(ftmac100_rxdes_rx_error(rxdes))) { 333 if (net_ratelimit()) 334 netdev_info(netdev, "rx err\n"); 335 336 netdev->stats.rx_errors++; 337 error = true; 338 } 339 340 if (unlikely(ftmac100_rxdes_crc_error(rxdes))) { 341 if (net_ratelimit()) 342 netdev_info(netdev, "rx crc err\n"); 343 344 netdev->stats.rx_crc_errors++; 345 error = true; 346 } 347 348 if (unlikely(ftmac100_rxdes_runt(rxdes))) { 349 if (net_ratelimit()) 350 netdev_info(netdev, "rx runt\n"); 351 352 netdev->stats.rx_length_errors++; 353 error = true; 354 } else if (unlikely(ftmac100_rxdes_odd_nibble(rxdes))) { 355 if (net_ratelimit()) 356 netdev_info(netdev, "rx odd nibble\n"); 357 358 netdev->stats.rx_length_errors++; 359 error = true; 360 } 361 /* 362 * FTMAC100_RXDES0_FTL is not an error, it just indicates that the 363 * frame is longer than 1518 octets. Receiving these is possible when 364 * we told the hardware not to drop them, via FTMAC100_MACCR_RX_FTL. 365 */ 366 367 return error; 368 } 369 370 static void ftmac100_rx_drop_packet(struct ftmac100 *priv) 371 { 372 struct net_device *netdev = priv->netdev; 373 struct ftmac100_rxdes *rxdes = ftmac100_current_rxdes(priv); 374 bool done = false; 375 376 if (net_ratelimit()) 377 netdev_dbg(netdev, "drop packet %p\n", rxdes); 378 379 do { 380 if (ftmac100_rxdes_last_segment(rxdes)) 381 done = true; 382 383 ftmac100_rxdes_set_dma_own(rxdes); 384 ftmac100_rx_pointer_advance(priv); 385 rxdes = ftmac100_current_rxdes(priv); 386 } while (!done && !ftmac100_rxdes_owned_by_dma(rxdes)); 387 388 netdev->stats.rx_dropped++; 389 } 390 391 static bool ftmac100_rx_packet(struct ftmac100 *priv, int *processed) 392 { 393 struct net_device *netdev = priv->netdev; 394 struct ftmac100_rxdes *rxdes; 395 struct sk_buff *skb; 396 struct page *page; 397 dma_addr_t map; 398 int length; 399 bool ret; 400 401 rxdes = ftmac100_rx_locate_first_segment(priv); 402 if (!rxdes) 403 return false; 404 405 if (unlikely(ftmac100_rx_packet_error(priv, rxdes))) { 406 ftmac100_rx_drop_packet(priv); 407 return true; 408 } 409 410 /* We don't support multi-segment packets for now, so drop them. */ 411 ret = ftmac100_rxdes_last_segment(rxdes); 412 if (unlikely(!ret)) { 413 netdev->stats.rx_length_errors++; 414 ftmac100_rx_drop_packet(priv); 415 return true; 416 } 417 418 /* start processing */ 419 skb = netdev_alloc_skb_ip_align(netdev, 128); 420 if (unlikely(!skb)) { 421 if (net_ratelimit()) 422 netdev_err(netdev, "rx skb alloc failed\n"); 423 424 ftmac100_rx_drop_packet(priv); 425 return true; 426 } 427 428 if (unlikely(ftmac100_rxdes_multicast(rxdes))) 429 netdev->stats.multicast++; 430 431 map = ftmac100_rxdes_get_dma_addr(rxdes); 432 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE); 433 434 length = ftmac100_rxdes_frame_length(rxdes); 435 page = ftmac100_rxdes_get_page(rxdes); 436 skb_fill_page_desc(skb, 0, page, 0, length); 437 skb->len += length; 438 skb->data_len += length; 439 440 if (length > 128) { 441 skb->truesize += PAGE_SIZE; 442 /* We pull the minimum amount into linear part */ 443 __pskb_pull_tail(skb, ETH_HLEN); 444 } else { 445 /* Small frames are copied into linear part to free one page */ 446 __pskb_pull_tail(skb, length); 447 } 448 ftmac100_alloc_rx_page(priv, rxdes, GFP_ATOMIC); 449 450 ftmac100_rx_pointer_advance(priv); 451 452 skb->protocol = eth_type_trans(skb, netdev); 453 454 netdev->stats.rx_packets++; 455 netdev->stats.rx_bytes += skb->len; 456 457 /* push packet to protocol stack */ 458 netif_receive_skb(skb); 459 460 (*processed)++; 461 return true; 462 } 463 464 /****************************************************************************** 465 * internal functions (transmit descriptor) 466 *****************************************************************************/ 467 static void ftmac100_txdes_reset(struct ftmac100_txdes *txdes) 468 { 469 /* clear all except end of ring bit */ 470 txdes->txdes0 = 0; 471 txdes->txdes1 &= cpu_to_le32(FTMAC100_TXDES1_EDOTR); 472 txdes->txdes2 = 0; 473 txdes->txdes3 = 0; 474 } 475 476 static bool ftmac100_txdes_owned_by_dma(struct ftmac100_txdes *txdes) 477 { 478 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN); 479 } 480 481 static void ftmac100_txdes_set_dma_own(struct ftmac100_txdes *txdes) 482 { 483 /* 484 * Make sure dma own bit will not be set before any other 485 * descriptor fields. 486 */ 487 wmb(); 488 txdes->txdes0 |= cpu_to_le32(FTMAC100_TXDES0_TXDMA_OWN); 489 } 490 491 static bool ftmac100_txdes_excessive_collision(struct ftmac100_txdes *txdes) 492 { 493 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_EXSCOL); 494 } 495 496 static bool ftmac100_txdes_late_collision(struct ftmac100_txdes *txdes) 497 { 498 return txdes->txdes0 & cpu_to_le32(FTMAC100_TXDES0_TXPKT_LATECOL); 499 } 500 501 static void ftmac100_txdes_set_end_of_ring(struct ftmac100_txdes *txdes) 502 { 503 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_EDOTR); 504 } 505 506 static void ftmac100_txdes_set_first_segment(struct ftmac100_txdes *txdes) 507 { 508 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_FTS); 509 } 510 511 static void ftmac100_txdes_set_last_segment(struct ftmac100_txdes *txdes) 512 { 513 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_LTS); 514 } 515 516 static void ftmac100_txdes_set_txint(struct ftmac100_txdes *txdes) 517 { 518 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXIC); 519 } 520 521 static void ftmac100_txdes_set_buffer_size(struct ftmac100_txdes *txdes, 522 unsigned int len) 523 { 524 txdes->txdes1 |= cpu_to_le32(FTMAC100_TXDES1_TXBUF_SIZE(len)); 525 } 526 527 static void ftmac100_txdes_set_dma_addr(struct ftmac100_txdes *txdes, 528 dma_addr_t addr) 529 { 530 txdes->txdes2 = cpu_to_le32(addr); 531 } 532 533 static dma_addr_t ftmac100_txdes_get_dma_addr(struct ftmac100_txdes *txdes) 534 { 535 return le32_to_cpu(txdes->txdes2); 536 } 537 538 /* 539 * txdes3 is not used by hardware. We use it to keep track of socket buffer. 540 * Since hardware does not touch it, we can skip cpu_to_le32()/le32_to_cpu(). 541 */ 542 static void ftmac100_txdes_set_skb(struct ftmac100_txdes *txdes, struct sk_buff *skb) 543 { 544 txdes->txdes3 = (unsigned int)skb; 545 } 546 547 static struct sk_buff *ftmac100_txdes_get_skb(struct ftmac100_txdes *txdes) 548 { 549 return (struct sk_buff *)txdes->txdes3; 550 } 551 552 /****************************************************************************** 553 * internal functions (transmit) 554 *****************************************************************************/ 555 static int ftmac100_next_tx_pointer(int pointer) 556 { 557 return (pointer + 1) & (TX_QUEUE_ENTRIES - 1); 558 } 559 560 static void ftmac100_tx_pointer_advance(struct ftmac100 *priv) 561 { 562 priv->tx_pointer = ftmac100_next_tx_pointer(priv->tx_pointer); 563 } 564 565 static void ftmac100_tx_clean_pointer_advance(struct ftmac100 *priv) 566 { 567 priv->tx_clean_pointer = ftmac100_next_tx_pointer(priv->tx_clean_pointer); 568 } 569 570 static struct ftmac100_txdes *ftmac100_current_txdes(struct ftmac100 *priv) 571 { 572 return &priv->descs->txdes[priv->tx_pointer]; 573 } 574 575 static struct ftmac100_txdes *ftmac100_current_clean_txdes(struct ftmac100 *priv) 576 { 577 return &priv->descs->txdes[priv->tx_clean_pointer]; 578 } 579 580 static bool ftmac100_tx_complete_packet(struct ftmac100 *priv) 581 { 582 struct net_device *netdev = priv->netdev; 583 struct ftmac100_txdes *txdes; 584 struct sk_buff *skb; 585 dma_addr_t map; 586 587 if (priv->tx_pending == 0) 588 return false; 589 590 txdes = ftmac100_current_clean_txdes(priv); 591 592 if (ftmac100_txdes_owned_by_dma(txdes)) 593 return false; 594 595 skb = ftmac100_txdes_get_skb(txdes); 596 map = ftmac100_txdes_get_dma_addr(txdes); 597 598 if (unlikely(ftmac100_txdes_excessive_collision(txdes) || 599 ftmac100_txdes_late_collision(txdes))) { 600 /* 601 * packet transmitted to ethernet lost due to late collision 602 * or excessive collision 603 */ 604 netdev->stats.tx_aborted_errors++; 605 } else { 606 netdev->stats.tx_packets++; 607 netdev->stats.tx_bytes += skb->len; 608 } 609 610 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE); 611 dev_kfree_skb(skb); 612 613 ftmac100_txdes_reset(txdes); 614 615 ftmac100_tx_clean_pointer_advance(priv); 616 617 spin_lock(&priv->tx_lock); 618 priv->tx_pending--; 619 spin_unlock(&priv->tx_lock); 620 netif_wake_queue(netdev); 621 622 return true; 623 } 624 625 static void ftmac100_tx_complete(struct ftmac100 *priv) 626 { 627 while (ftmac100_tx_complete_packet(priv)) 628 ; 629 } 630 631 static netdev_tx_t ftmac100_xmit(struct ftmac100 *priv, struct sk_buff *skb, 632 dma_addr_t map) 633 { 634 struct net_device *netdev = priv->netdev; 635 struct ftmac100_txdes *txdes; 636 unsigned int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len; 637 638 txdes = ftmac100_current_txdes(priv); 639 ftmac100_tx_pointer_advance(priv); 640 641 /* setup TX descriptor */ 642 ftmac100_txdes_set_skb(txdes, skb); 643 ftmac100_txdes_set_dma_addr(txdes, map); 644 645 ftmac100_txdes_set_first_segment(txdes); 646 ftmac100_txdes_set_last_segment(txdes); 647 ftmac100_txdes_set_txint(txdes); 648 ftmac100_txdes_set_buffer_size(txdes, len); 649 650 spin_lock(&priv->tx_lock); 651 priv->tx_pending++; 652 if (priv->tx_pending == TX_QUEUE_ENTRIES) 653 netif_stop_queue(netdev); 654 655 /* start transmit */ 656 ftmac100_txdes_set_dma_own(txdes); 657 spin_unlock(&priv->tx_lock); 658 659 ftmac100_txdma_start_polling(priv); 660 return NETDEV_TX_OK; 661 } 662 663 /****************************************************************************** 664 * internal functions (buffer) 665 *****************************************************************************/ 666 static int ftmac100_alloc_rx_page(struct ftmac100 *priv, 667 struct ftmac100_rxdes *rxdes, gfp_t gfp) 668 { 669 struct net_device *netdev = priv->netdev; 670 struct page *page; 671 dma_addr_t map; 672 673 page = alloc_page(gfp); 674 if (!page) { 675 if (net_ratelimit()) 676 netdev_err(netdev, "failed to allocate rx page\n"); 677 return -ENOMEM; 678 } 679 680 map = dma_map_page(priv->dev, page, 0, RX_BUF_SIZE, DMA_FROM_DEVICE); 681 if (unlikely(dma_mapping_error(priv->dev, map))) { 682 if (net_ratelimit()) 683 netdev_err(netdev, "failed to map rx page\n"); 684 __free_page(page); 685 return -ENOMEM; 686 } 687 688 ftmac100_rxdes_set_page(rxdes, page); 689 ftmac100_rxdes_set_dma_addr(rxdes, map); 690 ftmac100_rxdes_set_buffer_size(rxdes, RX_BUF_SIZE); 691 ftmac100_rxdes_set_dma_own(rxdes); 692 return 0; 693 } 694 695 static void ftmac100_free_buffers(struct ftmac100 *priv) 696 { 697 int i; 698 699 for (i = 0; i < RX_QUEUE_ENTRIES; i++) { 700 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i]; 701 struct page *page = ftmac100_rxdes_get_page(rxdes); 702 dma_addr_t map = ftmac100_rxdes_get_dma_addr(rxdes); 703 704 if (!page) 705 continue; 706 707 dma_unmap_page(priv->dev, map, RX_BUF_SIZE, DMA_FROM_DEVICE); 708 __free_page(page); 709 } 710 711 for (i = 0; i < TX_QUEUE_ENTRIES; i++) { 712 struct ftmac100_txdes *txdes = &priv->descs->txdes[i]; 713 struct sk_buff *skb = ftmac100_txdes_get_skb(txdes); 714 dma_addr_t map = ftmac100_txdes_get_dma_addr(txdes); 715 716 if (!skb) 717 continue; 718 719 dma_unmap_single(priv->dev, map, skb_headlen(skb), DMA_TO_DEVICE); 720 dev_kfree_skb(skb); 721 } 722 723 dma_free_coherent(priv->dev, sizeof(struct ftmac100_descs), 724 priv->descs, priv->descs_dma_addr); 725 } 726 727 static int ftmac100_alloc_buffers(struct ftmac100 *priv) 728 { 729 int i; 730 731 priv->descs = dma_alloc_coherent(priv->dev, 732 sizeof(struct ftmac100_descs), 733 &priv->descs_dma_addr, GFP_KERNEL); 734 if (!priv->descs) 735 return -ENOMEM; 736 737 /* initialize RX ring */ 738 ftmac100_rxdes_set_end_of_ring(&priv->descs->rxdes[RX_QUEUE_ENTRIES - 1]); 739 740 for (i = 0; i < RX_QUEUE_ENTRIES; i++) { 741 struct ftmac100_rxdes *rxdes = &priv->descs->rxdes[i]; 742 743 if (ftmac100_alloc_rx_page(priv, rxdes, GFP_KERNEL)) 744 goto err; 745 } 746 747 /* initialize TX ring */ 748 ftmac100_txdes_set_end_of_ring(&priv->descs->txdes[TX_QUEUE_ENTRIES - 1]); 749 return 0; 750 751 err: 752 ftmac100_free_buffers(priv); 753 return -ENOMEM; 754 } 755 756 /****************************************************************************** 757 * struct mii_if_info functions 758 *****************************************************************************/ 759 static int ftmac100_mdio_read(struct net_device *netdev, int phy_id, int reg) 760 { 761 struct ftmac100 *priv = netdev_priv(netdev); 762 unsigned int phycr; 763 int i; 764 765 phycr = FTMAC100_PHYCR_PHYAD(phy_id) | 766 FTMAC100_PHYCR_REGAD(reg) | 767 FTMAC100_PHYCR_MIIRD; 768 769 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR); 770 771 for (i = 0; i < 10; i++) { 772 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR); 773 774 if ((phycr & FTMAC100_PHYCR_MIIRD) == 0) 775 return phycr & FTMAC100_PHYCR_MIIRDATA; 776 777 udelay(100); 778 } 779 780 netdev_err(netdev, "mdio read timed out\n"); 781 return 0; 782 } 783 784 static void ftmac100_mdio_write(struct net_device *netdev, int phy_id, int reg, 785 int data) 786 { 787 struct ftmac100 *priv = netdev_priv(netdev); 788 unsigned int phycr; 789 int i; 790 791 phycr = FTMAC100_PHYCR_PHYAD(phy_id) | 792 FTMAC100_PHYCR_REGAD(reg) | 793 FTMAC100_PHYCR_MIIWR; 794 795 data = FTMAC100_PHYWDATA_MIIWDATA(data); 796 797 iowrite32(data, priv->base + FTMAC100_OFFSET_PHYWDATA); 798 iowrite32(phycr, priv->base + FTMAC100_OFFSET_PHYCR); 799 800 for (i = 0; i < 10; i++) { 801 phycr = ioread32(priv->base + FTMAC100_OFFSET_PHYCR); 802 803 if ((phycr & FTMAC100_PHYCR_MIIWR) == 0) 804 return; 805 806 udelay(100); 807 } 808 809 netdev_err(netdev, "mdio write timed out\n"); 810 } 811 812 /****************************************************************************** 813 * struct ethtool_ops functions 814 *****************************************************************************/ 815 static void ftmac100_get_drvinfo(struct net_device *netdev, 816 struct ethtool_drvinfo *info) 817 { 818 strscpy(info->driver, DRV_NAME, sizeof(info->driver)); 819 strscpy(info->bus_info, dev_name(&netdev->dev), sizeof(info->bus_info)); 820 } 821 822 static int ftmac100_get_link_ksettings(struct net_device *netdev, 823 struct ethtool_link_ksettings *cmd) 824 { 825 struct ftmac100 *priv = netdev_priv(netdev); 826 827 mii_ethtool_get_link_ksettings(&priv->mii, cmd); 828 829 return 0; 830 } 831 832 static int ftmac100_set_link_ksettings(struct net_device *netdev, 833 const struct ethtool_link_ksettings *cmd) 834 { 835 struct ftmac100 *priv = netdev_priv(netdev); 836 return mii_ethtool_set_link_ksettings(&priv->mii, cmd); 837 } 838 839 static int ftmac100_nway_reset(struct net_device *netdev) 840 { 841 struct ftmac100 *priv = netdev_priv(netdev); 842 return mii_nway_restart(&priv->mii); 843 } 844 845 static u32 ftmac100_get_link(struct net_device *netdev) 846 { 847 struct ftmac100 *priv = netdev_priv(netdev); 848 return mii_link_ok(&priv->mii); 849 } 850 851 static const struct ethtool_ops ftmac100_ethtool_ops = { 852 .get_drvinfo = ftmac100_get_drvinfo, 853 .nway_reset = ftmac100_nway_reset, 854 .get_link = ftmac100_get_link, 855 .get_link_ksettings = ftmac100_get_link_ksettings, 856 .set_link_ksettings = ftmac100_set_link_ksettings, 857 }; 858 859 /****************************************************************************** 860 * interrupt handler 861 *****************************************************************************/ 862 static irqreturn_t ftmac100_interrupt(int irq, void *dev_id) 863 { 864 struct net_device *netdev = dev_id; 865 struct ftmac100 *priv = netdev_priv(netdev); 866 867 /* Disable interrupts for polling */ 868 ftmac100_disable_all_int(priv); 869 if (likely(netif_running(netdev))) 870 napi_schedule(&priv->napi); 871 872 return IRQ_HANDLED; 873 } 874 875 /****************************************************************************** 876 * struct napi_struct functions 877 *****************************************************************************/ 878 static int ftmac100_poll(struct napi_struct *napi, int budget) 879 { 880 struct ftmac100 *priv = container_of(napi, struct ftmac100, napi); 881 struct net_device *netdev = priv->netdev; 882 unsigned int status; 883 bool completed = true; 884 int rx = 0; 885 886 status = ioread32(priv->base + FTMAC100_OFFSET_ISR); 887 888 if (status & (FTMAC100_INT_RPKT_FINISH | FTMAC100_INT_NORXBUF)) { 889 /* 890 * FTMAC100_INT_RPKT_FINISH: 891 * RX DMA has received packets into RX buffer successfully 892 * 893 * FTMAC100_INT_NORXBUF: 894 * RX buffer unavailable 895 */ 896 bool retry; 897 898 do { 899 retry = ftmac100_rx_packet(priv, &rx); 900 } while (retry && rx < budget); 901 902 if (retry && rx == budget) 903 completed = false; 904 } 905 906 if (status & (FTMAC100_INT_XPKT_OK | FTMAC100_INT_XPKT_LOST)) { 907 /* 908 * FTMAC100_INT_XPKT_OK: 909 * packet transmitted to ethernet successfully 910 * 911 * FTMAC100_INT_XPKT_LOST: 912 * packet transmitted to ethernet lost due to late 913 * collision or excessive collision 914 */ 915 ftmac100_tx_complete(priv); 916 } 917 918 if (status & (FTMAC100_INT_NORXBUF | FTMAC100_INT_RPKT_LOST | 919 FTMAC100_INT_AHB_ERR | FTMAC100_INT_PHYSTS_CHG)) { 920 if (net_ratelimit()) 921 netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status, 922 status & FTMAC100_INT_NORXBUF ? "NORXBUF " : "", 923 status & FTMAC100_INT_RPKT_LOST ? "RPKT_LOST " : "", 924 status & FTMAC100_INT_AHB_ERR ? "AHB_ERR " : "", 925 status & FTMAC100_INT_PHYSTS_CHG ? "PHYSTS_CHG" : ""); 926 927 if (status & FTMAC100_INT_NORXBUF) { 928 /* RX buffer unavailable */ 929 netdev->stats.rx_over_errors++; 930 } 931 932 if (status & FTMAC100_INT_RPKT_LOST) { 933 /* received packet lost due to RX FIFO full */ 934 netdev->stats.rx_fifo_errors++; 935 } 936 937 if (status & FTMAC100_INT_PHYSTS_CHG) { 938 /* PHY link status change */ 939 mii_check_link(&priv->mii); 940 } 941 } 942 943 if (completed) { 944 /* stop polling */ 945 napi_complete(napi); 946 ftmac100_enable_all_int(priv); 947 } 948 949 return rx; 950 } 951 952 /****************************************************************************** 953 * struct net_device_ops functions 954 *****************************************************************************/ 955 static int ftmac100_open(struct net_device *netdev) 956 { 957 struct ftmac100 *priv = netdev_priv(netdev); 958 int err; 959 960 err = ftmac100_alloc_buffers(priv); 961 if (err) { 962 netdev_err(netdev, "failed to allocate buffers\n"); 963 goto err_alloc; 964 } 965 966 err = request_irq(priv->irq, ftmac100_interrupt, 0, netdev->name, netdev); 967 if (err) { 968 netdev_err(netdev, "failed to request irq %d\n", priv->irq); 969 goto err_irq; 970 } 971 972 priv->rx_pointer = 0; 973 priv->tx_clean_pointer = 0; 974 priv->tx_pointer = 0; 975 priv->tx_pending = 0; 976 977 err = ftmac100_start_hw(priv); 978 if (err) 979 goto err_hw; 980 981 napi_enable(&priv->napi); 982 netif_start_queue(netdev); 983 984 ftmac100_enable_all_int(priv); 985 986 return 0; 987 988 err_hw: 989 free_irq(priv->irq, netdev); 990 err_irq: 991 ftmac100_free_buffers(priv); 992 err_alloc: 993 return err; 994 } 995 996 static int ftmac100_stop(struct net_device *netdev) 997 { 998 struct ftmac100 *priv = netdev_priv(netdev); 999 1000 ftmac100_disable_all_int(priv); 1001 netif_stop_queue(netdev); 1002 napi_disable(&priv->napi); 1003 ftmac100_stop_hw(priv); 1004 free_irq(priv->irq, netdev); 1005 ftmac100_free_buffers(priv); 1006 1007 return 0; 1008 } 1009 1010 static netdev_tx_t 1011 ftmac100_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev) 1012 { 1013 struct ftmac100 *priv = netdev_priv(netdev); 1014 dma_addr_t map; 1015 1016 if (unlikely(skb->len > MAX_PKT_SIZE)) { 1017 if (net_ratelimit()) 1018 netdev_dbg(netdev, "tx packet too big\n"); 1019 1020 netdev->stats.tx_dropped++; 1021 dev_kfree_skb(skb); 1022 return NETDEV_TX_OK; 1023 } 1024 1025 map = dma_map_single(priv->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); 1026 if (unlikely(dma_mapping_error(priv->dev, map))) { 1027 /* drop packet */ 1028 if (net_ratelimit()) 1029 netdev_err(netdev, "map socket buffer failed\n"); 1030 1031 netdev->stats.tx_dropped++; 1032 dev_kfree_skb(skb); 1033 return NETDEV_TX_OK; 1034 } 1035 1036 return ftmac100_xmit(priv, skb, map); 1037 } 1038 1039 /* optional */ 1040 static int ftmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd) 1041 { 1042 struct ftmac100 *priv = netdev_priv(netdev); 1043 struct mii_ioctl_data *data = if_mii(ifr); 1044 1045 return generic_mii_ioctl(&priv->mii, data, cmd, NULL); 1046 } 1047 1048 static int ftmac100_change_mtu(struct net_device *netdev, int mtu) 1049 { 1050 struct ftmac100 *priv = netdev_priv(netdev); 1051 unsigned int maccr; 1052 1053 maccr = ioread32(priv->base + FTMAC100_OFFSET_MACCR); 1054 if (mtu > ETH_DATA_LEN) { 1055 /* process long packets in the driver */ 1056 maccr |= FTMAC100_MACCR_RX_FTL; 1057 } else { 1058 /* Let the controller drop incoming packets greater 1059 * than 1518 (that is 1500 + 14 Ethernet + 4 FCS). 1060 */ 1061 maccr &= ~FTMAC100_MACCR_RX_FTL; 1062 } 1063 iowrite32(maccr, priv->base + FTMAC100_OFFSET_MACCR); 1064 1065 netdev->mtu = mtu; 1066 1067 return 0; 1068 } 1069 1070 static const struct net_device_ops ftmac100_netdev_ops = { 1071 .ndo_open = ftmac100_open, 1072 .ndo_stop = ftmac100_stop, 1073 .ndo_start_xmit = ftmac100_hard_start_xmit, 1074 .ndo_set_mac_address = eth_mac_addr, 1075 .ndo_validate_addr = eth_validate_addr, 1076 .ndo_eth_ioctl = ftmac100_do_ioctl, 1077 .ndo_change_mtu = ftmac100_change_mtu, 1078 }; 1079 1080 /****************************************************************************** 1081 * struct platform_driver functions 1082 *****************************************************************************/ 1083 static int ftmac100_probe(struct platform_device *pdev) 1084 { 1085 struct resource *res; 1086 int irq; 1087 struct net_device *netdev; 1088 struct ftmac100 *priv; 1089 int err; 1090 1091 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1092 if (!res) 1093 return -ENXIO; 1094 1095 irq = platform_get_irq(pdev, 0); 1096 if (irq < 0) 1097 return irq; 1098 1099 /* setup net_device */ 1100 netdev = alloc_etherdev(sizeof(*priv)); 1101 if (!netdev) { 1102 err = -ENOMEM; 1103 goto err_alloc_etherdev; 1104 } 1105 1106 SET_NETDEV_DEV(netdev, &pdev->dev); 1107 netdev->ethtool_ops = &ftmac100_ethtool_ops; 1108 netdev->netdev_ops = &ftmac100_netdev_ops; 1109 netdev->max_mtu = MAX_PKT_SIZE - VLAN_ETH_HLEN; 1110 1111 err = platform_get_ethdev_address(&pdev->dev, netdev); 1112 if (err == -EPROBE_DEFER) 1113 goto defer_get_mac; 1114 1115 platform_set_drvdata(pdev, netdev); 1116 1117 /* setup private data */ 1118 priv = netdev_priv(netdev); 1119 priv->netdev = netdev; 1120 priv->dev = &pdev->dev; 1121 1122 spin_lock_init(&priv->tx_lock); 1123 1124 /* initialize NAPI */ 1125 netif_napi_add(netdev, &priv->napi, ftmac100_poll); 1126 1127 /* map io memory */ 1128 priv->res = request_mem_region(res->start, resource_size(res), 1129 dev_name(&pdev->dev)); 1130 if (!priv->res) { 1131 dev_err(&pdev->dev, "Could not reserve memory region\n"); 1132 err = -ENOMEM; 1133 goto err_req_mem; 1134 } 1135 1136 priv->base = ioremap(res->start, resource_size(res)); 1137 if (!priv->base) { 1138 dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n"); 1139 err = -EIO; 1140 goto err_ioremap; 1141 } 1142 1143 priv->irq = irq; 1144 1145 /* initialize struct mii_if_info */ 1146 priv->mii.phy_id = 0; 1147 priv->mii.phy_id_mask = 0x1f; 1148 priv->mii.reg_num_mask = 0x1f; 1149 priv->mii.dev = netdev; 1150 priv->mii.mdio_read = ftmac100_mdio_read; 1151 priv->mii.mdio_write = ftmac100_mdio_write; 1152 1153 /* register network device */ 1154 err = register_netdev(netdev); 1155 if (err) { 1156 dev_err(&pdev->dev, "Failed to register netdev\n"); 1157 goto err_register_netdev; 1158 } 1159 1160 netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base); 1161 1162 if (!is_valid_ether_addr(netdev->dev_addr)) { 1163 eth_hw_addr_random(netdev); 1164 netdev_info(netdev, "generated random MAC address %pM\n", 1165 netdev->dev_addr); 1166 } 1167 1168 return 0; 1169 1170 err_register_netdev: 1171 iounmap(priv->base); 1172 err_ioremap: 1173 release_resource(priv->res); 1174 err_req_mem: 1175 netif_napi_del(&priv->napi); 1176 defer_get_mac: 1177 free_netdev(netdev); 1178 err_alloc_etherdev: 1179 return err; 1180 } 1181 1182 static int ftmac100_remove(struct platform_device *pdev) 1183 { 1184 struct net_device *netdev; 1185 struct ftmac100 *priv; 1186 1187 netdev = platform_get_drvdata(pdev); 1188 priv = netdev_priv(netdev); 1189 1190 unregister_netdev(netdev); 1191 1192 iounmap(priv->base); 1193 release_resource(priv->res); 1194 1195 netif_napi_del(&priv->napi); 1196 free_netdev(netdev); 1197 return 0; 1198 } 1199 1200 static const struct of_device_id ftmac100_of_ids[] = { 1201 { .compatible = "andestech,atmac100" }, 1202 { } 1203 }; 1204 1205 static struct platform_driver ftmac100_driver = { 1206 .probe = ftmac100_probe, 1207 .remove = ftmac100_remove, 1208 .driver = { 1209 .name = DRV_NAME, 1210 .of_match_table = ftmac100_of_ids 1211 }, 1212 }; 1213 1214 /****************************************************************************** 1215 * initialization / finalization 1216 *****************************************************************************/ 1217 module_platform_driver(ftmac100_driver); 1218 1219 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>"); 1220 MODULE_DESCRIPTION("FTMAC100 driver"); 1221 MODULE_LICENSE("GPL"); 1222 MODULE_DEVICE_TABLE(of, ftmac100_of_ids); 1223