1 /* MOXA ART Ethernet (RTL8201CP) driver. 2 * 3 * Copyright (C) 2013 Jonas Jensen 4 * 5 * Jonas Jensen <jonas.jensen@gmail.com> 6 * 7 * Based on code from 8 * Moxa Technology Co., Ltd. <www.moxa.com> 9 * 10 * This file is licensed under the terms of the GNU General Public 11 * License version 2. This program is licensed "as is" without any 12 * warranty of any kind, whether express or implied. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/netdevice.h> 17 #include <linux/etherdevice.h> 18 #include <linux/skbuff.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/ethtool.h> 21 #include <linux/platform_device.h> 22 #include <linux/interrupt.h> 23 #include <linux/irq.h> 24 #include <linux/of_address.h> 25 #include <linux/of_irq.h> 26 #include <linux/crc32.h> 27 #include <linux/crc32c.h> 28 29 #include "moxart_ether.h" 30 31 static inline void moxart_desc_write(u32 data, u32 *desc) 32 { 33 *desc = cpu_to_le32(data); 34 } 35 36 static inline u32 moxart_desc_read(u32 *desc) 37 { 38 return le32_to_cpu(*desc); 39 } 40 41 static inline void moxart_emac_write(struct net_device *ndev, 42 unsigned int reg, unsigned long value) 43 { 44 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 45 46 writel(value, priv->base + reg); 47 } 48 49 static void moxart_update_mac_address(struct net_device *ndev) 50 { 51 moxart_emac_write(ndev, REG_MAC_MS_ADDRESS, 52 ((ndev->dev_addr[0] << 8) | (ndev->dev_addr[1]))); 53 moxart_emac_write(ndev, REG_MAC_MS_ADDRESS + 4, 54 ((ndev->dev_addr[2] << 24) | 55 (ndev->dev_addr[3] << 16) | 56 (ndev->dev_addr[4] << 8) | 57 (ndev->dev_addr[5]))); 58 } 59 60 static int moxart_set_mac_address(struct net_device *ndev, void *addr) 61 { 62 struct sockaddr *address = addr; 63 64 if (!is_valid_ether_addr(address->sa_data)) 65 return -EADDRNOTAVAIL; 66 67 memcpy(ndev->dev_addr, address->sa_data, ndev->addr_len); 68 moxart_update_mac_address(ndev); 69 70 return 0; 71 } 72 73 static void moxart_mac_free_memory(struct net_device *ndev) 74 { 75 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 76 int i; 77 78 for (i = 0; i < RX_DESC_NUM; i++) 79 dma_unmap_single(&ndev->dev, priv->rx_mapping[i], 80 priv->rx_buf_size, DMA_FROM_DEVICE); 81 82 if (priv->tx_desc_base) 83 dma_free_coherent(NULL, TX_REG_DESC_SIZE * TX_DESC_NUM, 84 priv->tx_desc_base, priv->tx_base); 85 86 if (priv->rx_desc_base) 87 dma_free_coherent(NULL, RX_REG_DESC_SIZE * RX_DESC_NUM, 88 priv->rx_desc_base, priv->rx_base); 89 90 kfree(priv->tx_buf_base); 91 kfree(priv->rx_buf_base); 92 } 93 94 static void moxart_mac_reset(struct net_device *ndev) 95 { 96 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 97 98 writel(SW_RST, priv->base + REG_MAC_CTRL); 99 while (readl(priv->base + REG_MAC_CTRL) & SW_RST) 100 mdelay(10); 101 102 writel(0, priv->base + REG_INTERRUPT_MASK); 103 104 priv->reg_maccr = RX_BROADPKT | FULLDUP | CRC_APD | RX_FTL; 105 } 106 107 static void moxart_mac_enable(struct net_device *ndev) 108 { 109 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 110 111 writel(0x00001010, priv->base + REG_INT_TIMER_CTRL); 112 writel(0x00000001, priv->base + REG_APOLL_TIMER_CTRL); 113 writel(0x00000390, priv->base + REG_DMA_BLEN_CTRL); 114 115 priv->reg_imr |= (RPKT_FINISH_M | XPKT_FINISH_M); 116 writel(priv->reg_imr, priv->base + REG_INTERRUPT_MASK); 117 118 priv->reg_maccr |= (RCV_EN | XMT_EN | RDMA_EN | XDMA_EN); 119 writel(priv->reg_maccr, priv->base + REG_MAC_CTRL); 120 } 121 122 static void moxart_mac_setup_desc_ring(struct net_device *ndev) 123 { 124 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 125 void *desc; 126 int i; 127 128 for (i = 0; i < TX_DESC_NUM; i++) { 129 desc = priv->tx_desc_base + i * TX_REG_DESC_SIZE; 130 memset(desc, 0, TX_REG_DESC_SIZE); 131 132 priv->tx_buf[i] = priv->tx_buf_base + priv->tx_buf_size * i; 133 } 134 moxart_desc_write(TX_DESC1_END, desc + TX_REG_OFFSET_DESC1); 135 136 priv->tx_head = 0; 137 priv->tx_tail = 0; 138 139 for (i = 0; i < RX_DESC_NUM; i++) { 140 desc = priv->rx_desc_base + i * RX_REG_DESC_SIZE; 141 memset(desc, 0, RX_REG_DESC_SIZE); 142 moxart_desc_write(RX_DESC0_DMA_OWN, desc + RX_REG_OFFSET_DESC0); 143 moxart_desc_write(RX_BUF_SIZE & RX_DESC1_BUF_SIZE_MASK, 144 desc + RX_REG_OFFSET_DESC1); 145 146 priv->rx_buf[i] = priv->rx_buf_base + priv->rx_buf_size * i; 147 priv->rx_mapping[i] = dma_map_single(&ndev->dev, 148 priv->rx_buf[i], 149 priv->rx_buf_size, 150 DMA_FROM_DEVICE); 151 if (dma_mapping_error(&ndev->dev, priv->rx_mapping[i])) 152 netdev_err(ndev, "DMA mapping error\n"); 153 154 moxart_desc_write(priv->rx_mapping[i], 155 desc + RX_REG_OFFSET_DESC2 + RX_DESC2_ADDRESS_PHYS); 156 moxart_desc_write((uintptr_t)priv->rx_buf[i], 157 desc + RX_REG_OFFSET_DESC2 + RX_DESC2_ADDRESS_VIRT); 158 } 159 moxart_desc_write(RX_DESC1_END, desc + RX_REG_OFFSET_DESC1); 160 161 priv->rx_head = 0; 162 163 /* reset the MAC controller TX/RX desciptor base address */ 164 writel(priv->tx_base, priv->base + REG_TXR_BASE_ADDRESS); 165 writel(priv->rx_base, priv->base + REG_RXR_BASE_ADDRESS); 166 } 167 168 static int moxart_mac_open(struct net_device *ndev) 169 { 170 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 171 172 if (!is_valid_ether_addr(ndev->dev_addr)) 173 return -EADDRNOTAVAIL; 174 175 napi_enable(&priv->napi); 176 177 moxart_mac_reset(ndev); 178 moxart_update_mac_address(ndev); 179 moxart_mac_setup_desc_ring(ndev); 180 moxart_mac_enable(ndev); 181 netif_start_queue(ndev); 182 183 netdev_dbg(ndev, "%s: IMR=0x%x, MACCR=0x%x\n", 184 __func__, readl(priv->base + REG_INTERRUPT_MASK), 185 readl(priv->base + REG_MAC_CTRL)); 186 187 return 0; 188 } 189 190 static int moxart_mac_stop(struct net_device *ndev) 191 { 192 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 193 194 napi_disable(&priv->napi); 195 196 netif_stop_queue(ndev); 197 198 /* disable all interrupts */ 199 writel(0, priv->base + REG_INTERRUPT_MASK); 200 201 /* disable all functions */ 202 writel(0, priv->base + REG_MAC_CTRL); 203 204 return 0; 205 } 206 207 static int moxart_rx_poll(struct napi_struct *napi, int budget) 208 { 209 struct moxart_mac_priv_t *priv = container_of(napi, 210 struct moxart_mac_priv_t, 211 napi); 212 struct net_device *ndev = priv->ndev; 213 struct sk_buff *skb; 214 void *desc; 215 unsigned int desc0, len; 216 int rx_head = priv->rx_head; 217 int rx = 0; 218 219 while (rx < budget) { 220 desc = priv->rx_desc_base + (RX_REG_DESC_SIZE * rx_head); 221 desc0 = moxart_desc_read(desc + RX_REG_OFFSET_DESC0); 222 rmb(); /* ensure desc0 is up to date */ 223 224 if (desc0 & RX_DESC0_DMA_OWN) 225 break; 226 227 if (desc0 & (RX_DESC0_ERR | RX_DESC0_CRC_ERR | RX_DESC0_FTL | 228 RX_DESC0_RUNT | RX_DESC0_ODD_NB)) { 229 net_dbg_ratelimited("packet error\n"); 230 priv->stats.rx_dropped++; 231 priv->stats.rx_errors++; 232 goto rx_next; 233 } 234 235 len = desc0 & RX_DESC0_FRAME_LEN_MASK; 236 237 if (len > RX_BUF_SIZE) 238 len = RX_BUF_SIZE; 239 240 dma_sync_single_for_cpu(&ndev->dev, 241 priv->rx_mapping[rx_head], 242 priv->rx_buf_size, DMA_FROM_DEVICE); 243 skb = netdev_alloc_skb_ip_align(ndev, len); 244 245 if (unlikely(!skb)) { 246 net_dbg_ratelimited("netdev_alloc_skb_ip_align failed\n"); 247 priv->stats.rx_dropped++; 248 priv->stats.rx_errors++; 249 goto rx_next; 250 } 251 252 memcpy(skb->data, priv->rx_buf[rx_head], len); 253 skb_put(skb, len); 254 skb->protocol = eth_type_trans(skb, ndev); 255 napi_gro_receive(&priv->napi, skb); 256 rx++; 257 258 priv->stats.rx_packets++; 259 priv->stats.rx_bytes += len; 260 if (desc0 & RX_DESC0_MULTICAST) 261 priv->stats.multicast++; 262 263 rx_next: 264 wmb(); /* prevent setting ownership back too early */ 265 moxart_desc_write(RX_DESC0_DMA_OWN, desc + RX_REG_OFFSET_DESC0); 266 267 rx_head = RX_NEXT(rx_head); 268 priv->rx_head = rx_head; 269 } 270 271 if (rx < budget) { 272 napi_complete(napi); 273 } 274 275 priv->reg_imr |= RPKT_FINISH_M; 276 writel(priv->reg_imr, priv->base + REG_INTERRUPT_MASK); 277 278 return rx; 279 } 280 281 static void moxart_tx_finished(struct net_device *ndev) 282 { 283 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 284 unsigned tx_head = priv->tx_head; 285 unsigned tx_tail = priv->tx_tail; 286 287 while (tx_tail != tx_head) { 288 dma_unmap_single(&ndev->dev, priv->tx_mapping[tx_tail], 289 priv->tx_len[tx_tail], DMA_TO_DEVICE); 290 291 priv->stats.tx_packets++; 292 priv->stats.tx_bytes += priv->tx_skb[tx_tail]->len; 293 294 dev_kfree_skb_irq(priv->tx_skb[tx_tail]); 295 priv->tx_skb[tx_tail] = NULL; 296 297 tx_tail = TX_NEXT(tx_tail); 298 } 299 priv->tx_tail = tx_tail; 300 } 301 302 static irqreturn_t moxart_mac_interrupt(int irq, void *dev_id) 303 { 304 struct net_device *ndev = (struct net_device *) dev_id; 305 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 306 unsigned int ists = readl(priv->base + REG_INTERRUPT_STATUS); 307 308 if (ists & XPKT_OK_INT_STS) 309 moxart_tx_finished(ndev); 310 311 if (ists & RPKT_FINISH) { 312 if (napi_schedule_prep(&priv->napi)) { 313 priv->reg_imr &= ~RPKT_FINISH_M; 314 writel(priv->reg_imr, priv->base + REG_INTERRUPT_MASK); 315 __napi_schedule(&priv->napi); 316 } 317 } 318 319 return IRQ_HANDLED; 320 } 321 322 static int moxart_mac_start_xmit(struct sk_buff *skb, struct net_device *ndev) 323 { 324 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 325 void *desc; 326 unsigned int len; 327 unsigned int tx_head = priv->tx_head; 328 u32 txdes1; 329 int ret = NETDEV_TX_BUSY; 330 331 desc = priv->tx_desc_base + (TX_REG_DESC_SIZE * tx_head); 332 333 spin_lock_irq(&priv->txlock); 334 if (moxart_desc_read(desc + TX_REG_OFFSET_DESC0) & TX_DESC0_DMA_OWN) { 335 net_dbg_ratelimited("no TX space for packet\n"); 336 priv->stats.tx_dropped++; 337 goto out_unlock; 338 } 339 rmb(); /* ensure data is only read that had TX_DESC0_DMA_OWN cleared */ 340 341 len = skb->len > TX_BUF_SIZE ? TX_BUF_SIZE : skb->len; 342 343 priv->tx_mapping[tx_head] = dma_map_single(&ndev->dev, skb->data, 344 len, DMA_TO_DEVICE); 345 if (dma_mapping_error(&ndev->dev, priv->tx_mapping[tx_head])) { 346 netdev_err(ndev, "DMA mapping error\n"); 347 goto out_unlock; 348 } 349 350 priv->tx_len[tx_head] = len; 351 priv->tx_skb[tx_head] = skb; 352 353 moxart_desc_write(priv->tx_mapping[tx_head], 354 desc + TX_REG_OFFSET_DESC2 + TX_DESC2_ADDRESS_PHYS); 355 moxart_desc_write((uintptr_t)skb->data, 356 desc + TX_REG_OFFSET_DESC2 + TX_DESC2_ADDRESS_VIRT); 357 358 if (skb->len < ETH_ZLEN) { 359 memset(&skb->data[skb->len], 360 0, ETH_ZLEN - skb->len); 361 len = ETH_ZLEN; 362 } 363 364 dma_sync_single_for_device(&ndev->dev, priv->tx_mapping[tx_head], 365 priv->tx_buf_size, DMA_TO_DEVICE); 366 367 txdes1 = TX_DESC1_LTS | TX_DESC1_FTS | (len & TX_DESC1_BUF_SIZE_MASK); 368 if (tx_head == TX_DESC_NUM_MASK) 369 txdes1 |= TX_DESC1_END; 370 moxart_desc_write(txdes1, desc + TX_REG_OFFSET_DESC1); 371 wmb(); /* flush descriptor before transferring ownership */ 372 moxart_desc_write(TX_DESC0_DMA_OWN, desc + TX_REG_OFFSET_DESC0); 373 374 /* start to send packet */ 375 writel(0xffffffff, priv->base + REG_TX_POLL_DEMAND); 376 377 priv->tx_head = TX_NEXT(tx_head); 378 379 ndev->trans_start = jiffies; 380 ret = NETDEV_TX_OK; 381 out_unlock: 382 spin_unlock_irq(&priv->txlock); 383 384 return ret; 385 } 386 387 static struct net_device_stats *moxart_mac_get_stats(struct net_device *ndev) 388 { 389 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 390 391 return &priv->stats; 392 } 393 394 static void moxart_mac_setmulticast(struct net_device *ndev) 395 { 396 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 397 struct netdev_hw_addr *ha; 398 int crc_val; 399 400 netdev_for_each_mc_addr(ha, ndev) { 401 crc_val = crc32_le(~0, ha->addr, ETH_ALEN); 402 crc_val = (crc_val >> 26) & 0x3f; 403 if (crc_val >= 32) { 404 writel(readl(priv->base + REG_MCAST_HASH_TABLE1) | 405 (1UL << (crc_val - 32)), 406 priv->base + REG_MCAST_HASH_TABLE1); 407 } else { 408 writel(readl(priv->base + REG_MCAST_HASH_TABLE0) | 409 (1UL << crc_val), 410 priv->base + REG_MCAST_HASH_TABLE0); 411 } 412 } 413 } 414 415 static void moxart_mac_set_rx_mode(struct net_device *ndev) 416 { 417 struct moxart_mac_priv_t *priv = netdev_priv(ndev); 418 419 spin_lock_irq(&priv->txlock); 420 421 (ndev->flags & IFF_PROMISC) ? (priv->reg_maccr |= RCV_ALL) : 422 (priv->reg_maccr &= ~RCV_ALL); 423 424 (ndev->flags & IFF_ALLMULTI) ? (priv->reg_maccr |= RX_MULTIPKT) : 425 (priv->reg_maccr &= ~RX_MULTIPKT); 426 427 if ((ndev->flags & IFF_MULTICAST) && netdev_mc_count(ndev)) { 428 priv->reg_maccr |= HT_MULTI_EN; 429 moxart_mac_setmulticast(ndev); 430 } else { 431 priv->reg_maccr &= ~HT_MULTI_EN; 432 } 433 434 writel(priv->reg_maccr, priv->base + REG_MAC_CTRL); 435 436 spin_unlock_irq(&priv->txlock); 437 } 438 439 static struct net_device_ops moxart_netdev_ops = { 440 .ndo_open = moxart_mac_open, 441 .ndo_stop = moxart_mac_stop, 442 .ndo_start_xmit = moxart_mac_start_xmit, 443 .ndo_get_stats = moxart_mac_get_stats, 444 .ndo_set_rx_mode = moxart_mac_set_rx_mode, 445 .ndo_set_mac_address = moxart_set_mac_address, 446 .ndo_validate_addr = eth_validate_addr, 447 .ndo_change_mtu = eth_change_mtu, 448 }; 449 450 static int moxart_mac_probe(struct platform_device *pdev) 451 { 452 struct device *p_dev = &pdev->dev; 453 struct device_node *node = p_dev->of_node; 454 struct net_device *ndev; 455 struct moxart_mac_priv_t *priv; 456 struct resource *res; 457 unsigned int irq; 458 int ret; 459 460 ndev = alloc_etherdev(sizeof(struct moxart_mac_priv_t)); 461 if (!ndev) 462 return -ENOMEM; 463 464 irq = irq_of_parse_and_map(node, 0); 465 if (irq <= 0) { 466 netdev_err(ndev, "irq_of_parse_and_map failed\n"); 467 ret = -EINVAL; 468 goto irq_map_fail; 469 } 470 471 priv = netdev_priv(ndev); 472 priv->ndev = ndev; 473 474 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 475 ndev->base_addr = res->start; 476 priv->base = devm_ioremap_resource(p_dev, res); 477 if (IS_ERR(priv->base)) { 478 dev_err(p_dev, "devm_ioremap_resource failed\n"); 479 ret = PTR_ERR(priv->base); 480 goto init_fail; 481 } 482 483 spin_lock_init(&priv->txlock); 484 485 priv->tx_buf_size = TX_BUF_SIZE; 486 priv->rx_buf_size = RX_BUF_SIZE; 487 488 priv->tx_desc_base = dma_alloc_coherent(NULL, TX_REG_DESC_SIZE * 489 TX_DESC_NUM, &priv->tx_base, 490 GFP_DMA | GFP_KERNEL); 491 if (priv->tx_desc_base == NULL) { 492 ret = -ENOMEM; 493 goto init_fail; 494 } 495 496 priv->rx_desc_base = dma_alloc_coherent(NULL, RX_REG_DESC_SIZE * 497 RX_DESC_NUM, &priv->rx_base, 498 GFP_DMA | GFP_KERNEL); 499 if (priv->rx_desc_base == NULL) { 500 ret = -ENOMEM; 501 goto init_fail; 502 } 503 504 priv->tx_buf_base = kmalloc(priv->tx_buf_size * TX_DESC_NUM, 505 GFP_ATOMIC); 506 if (!priv->tx_buf_base) { 507 ret = -ENOMEM; 508 goto init_fail; 509 } 510 511 priv->rx_buf_base = kmalloc(priv->rx_buf_size * RX_DESC_NUM, 512 GFP_ATOMIC); 513 if (!priv->rx_buf_base) { 514 ret = -ENOMEM; 515 goto init_fail; 516 } 517 518 platform_set_drvdata(pdev, ndev); 519 520 ret = devm_request_irq(p_dev, irq, moxart_mac_interrupt, 0, 521 pdev->name, ndev); 522 if (ret) { 523 netdev_err(ndev, "devm_request_irq failed\n"); 524 goto init_fail; 525 } 526 527 ndev->netdev_ops = &moxart_netdev_ops; 528 netif_napi_add(ndev, &priv->napi, moxart_rx_poll, RX_DESC_NUM); 529 ndev->priv_flags |= IFF_UNICAST_FLT; 530 ndev->irq = irq; 531 532 SET_NETDEV_DEV(ndev, &pdev->dev); 533 534 ret = register_netdev(ndev); 535 if (ret) { 536 free_netdev(ndev); 537 goto init_fail; 538 } 539 540 netdev_dbg(ndev, "%s: IRQ=%d address=%pM\n", 541 __func__, ndev->irq, ndev->dev_addr); 542 543 return 0; 544 545 init_fail: 546 netdev_err(ndev, "init failed\n"); 547 moxart_mac_free_memory(ndev); 548 irq_map_fail: 549 free_netdev(ndev); 550 return ret; 551 } 552 553 static int moxart_remove(struct platform_device *pdev) 554 { 555 struct net_device *ndev = platform_get_drvdata(pdev); 556 557 unregister_netdev(ndev); 558 free_irq(ndev->irq, ndev); 559 moxart_mac_free_memory(ndev); 560 free_netdev(ndev); 561 562 return 0; 563 } 564 565 static const struct of_device_id moxart_mac_match[] = { 566 { .compatible = "moxa,moxart-mac" }, 567 { } 568 }; 569 MODULE_DEVICE_TABLE(of, moxart_mac_match); 570 571 static struct platform_driver moxart_mac_driver = { 572 .probe = moxart_mac_probe, 573 .remove = moxart_remove, 574 .driver = { 575 .name = "moxart-ethernet", 576 .of_match_table = moxart_mac_match, 577 }, 578 }; 579 module_platform_driver(moxart_mac_driver); 580 581 MODULE_DESCRIPTION("MOXART RTL8201CP Ethernet driver"); 582 MODULE_LICENSE("GPL v2"); 583 MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); 584