1 /* 2 * Allwinner EMAC Fast Ethernet driver for Linux. 3 * 4 * Copyright 2012-2013 Stefan Roese <sr@denx.de> 5 * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com> 6 * 7 * Based on the Linux driver provided by Allwinner: 8 * Copyright (C) 1997 Sten Wang 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/clk.h> 16 #include <linux/etherdevice.h> 17 #include <linux/ethtool.h> 18 #include <linux/gpio.h> 19 #include <linux/interrupt.h> 20 #include <linux/irq.h> 21 #include <linux/mii.h> 22 #include <linux/module.h> 23 #include <linux/netdevice.h> 24 #include <linux/of_address.h> 25 #include <linux/of_irq.h> 26 #include <linux/of_mdio.h> 27 #include <linux/of_net.h> 28 #include <linux/of_platform.h> 29 #include <linux/platform_device.h> 30 #include <linux/phy.h> 31 #include <linux/soc/sunxi/sunxi_sram.h> 32 33 #include "sun4i-emac.h" 34 35 #define DRV_NAME "sun4i-emac" 36 #define DRV_VERSION "1.02" 37 38 #define EMAC_MAX_FRAME_LEN 0x0600 39 40 #define EMAC_DEFAULT_MSG_ENABLE 0x0000 41 static int debug = -1; /* defaults above */; 42 module_param(debug, int, 0); 43 MODULE_PARM_DESC(debug, "debug message flags"); 44 45 /* Transmit timeout, default 5 seconds. */ 46 static int watchdog = 5000; 47 module_param(watchdog, int, 0400); 48 MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds"); 49 50 /* EMAC register address locking. 51 * 52 * The EMAC uses an address register to control where data written 53 * to the data register goes. This means that the address register 54 * must be preserved over interrupts or similar calls. 55 * 56 * During interrupt and other critical calls, a spinlock is used to 57 * protect the system, but the calls themselves save the address 58 * in the address register in case they are interrupting another 59 * access to the device. 60 * 61 * For general accesses a lock is provided so that calls which are 62 * allowed to sleep are serialised so that the address register does 63 * not need to be saved. This lock also serves to serialise access 64 * to the EEPROM and PHY access registers which are shared between 65 * these two devices. 66 */ 67 68 /* The driver supports the original EMACE, and now the two newer 69 * devices, EMACA and EMACB. 70 */ 71 72 struct emac_board_info { 73 struct clk *clk; 74 struct device *dev; 75 struct platform_device *pdev; 76 spinlock_t lock; 77 void __iomem *membase; 78 u32 msg_enable; 79 struct net_device *ndev; 80 struct sk_buff *skb_last; 81 u16 tx_fifo_stat; 82 83 int emacrx_completed_flag; 84 85 struct device_node *phy_node; 86 unsigned int link; 87 unsigned int speed; 88 unsigned int duplex; 89 90 phy_interface_t phy_interface; 91 }; 92 93 static void emac_update_speed(struct net_device *dev) 94 { 95 struct emac_board_info *db = netdev_priv(dev); 96 unsigned int reg_val; 97 98 /* set EMAC SPEED, depend on PHY */ 99 reg_val = readl(db->membase + EMAC_MAC_SUPP_REG); 100 reg_val &= ~(0x1 << 8); 101 if (db->speed == SPEED_100) 102 reg_val |= 1 << 8; 103 writel(reg_val, db->membase + EMAC_MAC_SUPP_REG); 104 } 105 106 static void emac_update_duplex(struct net_device *dev) 107 { 108 struct emac_board_info *db = netdev_priv(dev); 109 unsigned int reg_val; 110 111 /* set duplex depend on phy */ 112 reg_val = readl(db->membase + EMAC_MAC_CTL1_REG); 113 reg_val &= ~EMAC_MAC_CTL1_DUPLEX_EN; 114 if (db->duplex) 115 reg_val |= EMAC_MAC_CTL1_DUPLEX_EN; 116 writel(reg_val, db->membase + EMAC_MAC_CTL1_REG); 117 } 118 119 static void emac_handle_link_change(struct net_device *dev) 120 { 121 struct emac_board_info *db = netdev_priv(dev); 122 struct phy_device *phydev = dev->phydev; 123 unsigned long flags; 124 int status_change = 0; 125 126 if (phydev->link) { 127 if (db->speed != phydev->speed) { 128 spin_lock_irqsave(&db->lock, flags); 129 db->speed = phydev->speed; 130 emac_update_speed(dev); 131 spin_unlock_irqrestore(&db->lock, flags); 132 status_change = 1; 133 } 134 135 if (db->duplex != phydev->duplex) { 136 spin_lock_irqsave(&db->lock, flags); 137 db->duplex = phydev->duplex; 138 emac_update_duplex(dev); 139 spin_unlock_irqrestore(&db->lock, flags); 140 status_change = 1; 141 } 142 } 143 144 if (phydev->link != db->link) { 145 if (!phydev->link) { 146 db->speed = 0; 147 db->duplex = -1; 148 } 149 db->link = phydev->link; 150 151 status_change = 1; 152 } 153 154 if (status_change) 155 phy_print_status(phydev); 156 } 157 158 static int emac_mdio_probe(struct net_device *dev) 159 { 160 struct emac_board_info *db = netdev_priv(dev); 161 struct phy_device *phydev; 162 163 /* to-do: PHY interrupts are currently not supported */ 164 165 /* attach the mac to the phy */ 166 phydev = of_phy_connect(db->ndev, db->phy_node, 167 &emac_handle_link_change, 0, 168 db->phy_interface); 169 if (!phydev) { 170 netdev_err(db->ndev, "could not find the PHY\n"); 171 return -ENODEV; 172 } 173 174 /* mask with MAC supported features */ 175 phy_set_max_speed(phydev, SPEED_100); 176 177 db->link = 0; 178 db->speed = 0; 179 db->duplex = -1; 180 181 return 0; 182 } 183 184 static void emac_mdio_remove(struct net_device *dev) 185 { 186 phy_disconnect(dev->phydev); 187 } 188 189 static void emac_reset(struct emac_board_info *db) 190 { 191 dev_dbg(db->dev, "resetting device\n"); 192 193 /* RESET device */ 194 writel(0, db->membase + EMAC_CTL_REG); 195 udelay(200); 196 writel(EMAC_CTL_RESET, db->membase + EMAC_CTL_REG); 197 udelay(200); 198 } 199 200 static void emac_outblk_32bit(void __iomem *reg, void *data, int count) 201 { 202 writesl(reg, data, round_up(count, 4) / 4); 203 } 204 205 static void emac_inblk_32bit(void __iomem *reg, void *data, int count) 206 { 207 readsl(reg, data, round_up(count, 4) / 4); 208 } 209 210 static int emac_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 211 { 212 struct phy_device *phydev = dev->phydev; 213 214 if (!netif_running(dev)) 215 return -EINVAL; 216 217 if (!phydev) 218 return -ENODEV; 219 220 return phy_mii_ioctl(phydev, rq, cmd); 221 } 222 223 /* ethtool ops */ 224 static void emac_get_drvinfo(struct net_device *dev, 225 struct ethtool_drvinfo *info) 226 { 227 strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); 228 strlcpy(info->version, DRV_VERSION, sizeof(info->version)); 229 strlcpy(info->bus_info, dev_name(&dev->dev), sizeof(info->bus_info)); 230 } 231 232 static u32 emac_get_msglevel(struct net_device *dev) 233 { 234 struct emac_board_info *db = netdev_priv(dev); 235 236 return db->msg_enable; 237 } 238 239 static void emac_set_msglevel(struct net_device *dev, u32 value) 240 { 241 struct emac_board_info *db = netdev_priv(dev); 242 243 db->msg_enable = value; 244 } 245 246 static const struct ethtool_ops emac_ethtool_ops = { 247 .get_drvinfo = emac_get_drvinfo, 248 .get_link = ethtool_op_get_link, 249 .get_link_ksettings = phy_ethtool_get_link_ksettings, 250 .set_link_ksettings = phy_ethtool_set_link_ksettings, 251 .get_msglevel = emac_get_msglevel, 252 .set_msglevel = emac_set_msglevel, 253 }; 254 255 static unsigned int emac_setup(struct net_device *ndev) 256 { 257 struct emac_board_info *db = netdev_priv(ndev); 258 unsigned int reg_val; 259 260 /* set up TX */ 261 reg_val = readl(db->membase + EMAC_TX_MODE_REG); 262 263 writel(reg_val | EMAC_TX_MODE_ABORTED_FRAME_EN, 264 db->membase + EMAC_TX_MODE_REG); 265 266 /* set MAC */ 267 /* set MAC CTL0 */ 268 reg_val = readl(db->membase + EMAC_MAC_CTL0_REG); 269 writel(reg_val | EMAC_MAC_CTL0_RX_FLOW_CTL_EN | 270 EMAC_MAC_CTL0_TX_FLOW_CTL_EN, 271 db->membase + EMAC_MAC_CTL0_REG); 272 273 /* set MAC CTL1 */ 274 reg_val = readl(db->membase + EMAC_MAC_CTL1_REG); 275 reg_val |= EMAC_MAC_CTL1_LEN_CHECK_EN; 276 reg_val |= EMAC_MAC_CTL1_CRC_EN; 277 reg_val |= EMAC_MAC_CTL1_PAD_EN; 278 writel(reg_val, db->membase + EMAC_MAC_CTL1_REG); 279 280 /* set up IPGT */ 281 writel(EMAC_MAC_IPGT_FULL_DUPLEX, db->membase + EMAC_MAC_IPGT_REG); 282 283 /* set up IPGR */ 284 writel((EMAC_MAC_IPGR_IPG1 << 8) | EMAC_MAC_IPGR_IPG2, 285 db->membase + EMAC_MAC_IPGR_REG); 286 287 /* set up Collison window */ 288 writel((EMAC_MAC_CLRT_COLLISION_WINDOW << 8) | EMAC_MAC_CLRT_RM, 289 db->membase + EMAC_MAC_CLRT_REG); 290 291 /* set up Max Frame Length */ 292 writel(EMAC_MAX_FRAME_LEN, 293 db->membase + EMAC_MAC_MAXF_REG); 294 295 return 0; 296 } 297 298 static void emac_set_rx_mode(struct net_device *ndev) 299 { 300 struct emac_board_info *db = netdev_priv(ndev); 301 unsigned int reg_val; 302 303 /* set up RX */ 304 reg_val = readl(db->membase + EMAC_RX_CTL_REG); 305 306 if (ndev->flags & IFF_PROMISC) 307 reg_val |= EMAC_RX_CTL_PASS_ALL_EN; 308 else 309 reg_val &= ~EMAC_RX_CTL_PASS_ALL_EN; 310 311 writel(reg_val | EMAC_RX_CTL_PASS_LEN_OOR_EN | 312 EMAC_RX_CTL_ACCEPT_UNICAST_EN | EMAC_RX_CTL_DA_FILTER_EN | 313 EMAC_RX_CTL_ACCEPT_MULTICAST_EN | 314 EMAC_RX_CTL_ACCEPT_BROADCAST_EN, 315 db->membase + EMAC_RX_CTL_REG); 316 } 317 318 static unsigned int emac_powerup(struct net_device *ndev) 319 { 320 struct emac_board_info *db = netdev_priv(ndev); 321 unsigned int reg_val; 322 323 /* initial EMAC */ 324 /* flush RX FIFO */ 325 reg_val = readl(db->membase + EMAC_RX_CTL_REG); 326 reg_val |= 0x8; 327 writel(reg_val, db->membase + EMAC_RX_CTL_REG); 328 udelay(1); 329 330 /* initial MAC */ 331 /* soft reset MAC */ 332 reg_val = readl(db->membase + EMAC_MAC_CTL0_REG); 333 reg_val &= ~EMAC_MAC_CTL0_SOFT_RESET; 334 writel(reg_val, db->membase + EMAC_MAC_CTL0_REG); 335 336 /* set MII clock */ 337 reg_val = readl(db->membase + EMAC_MAC_MCFG_REG); 338 reg_val &= (~(0xf << 2)); 339 reg_val |= (0xD << 2); 340 writel(reg_val, db->membase + EMAC_MAC_MCFG_REG); 341 342 /* clear RX counter */ 343 writel(0x0, db->membase + EMAC_RX_FBC_REG); 344 345 /* disable all interrupt and clear interrupt status */ 346 writel(0, db->membase + EMAC_INT_CTL_REG); 347 reg_val = readl(db->membase + EMAC_INT_STA_REG); 348 writel(reg_val, db->membase + EMAC_INT_STA_REG); 349 350 udelay(1); 351 352 /* set up EMAC */ 353 emac_setup(ndev); 354 355 /* set mac_address to chip */ 356 writel(ndev->dev_addr[0] << 16 | ndev->dev_addr[1] << 8 | ndev-> 357 dev_addr[2], db->membase + EMAC_MAC_A1_REG); 358 writel(ndev->dev_addr[3] << 16 | ndev->dev_addr[4] << 8 | ndev-> 359 dev_addr[5], db->membase + EMAC_MAC_A0_REG); 360 361 mdelay(1); 362 363 return 0; 364 } 365 366 static int emac_set_mac_address(struct net_device *dev, void *p) 367 { 368 struct sockaddr *addr = p; 369 struct emac_board_info *db = netdev_priv(dev); 370 371 if (netif_running(dev)) 372 return -EBUSY; 373 374 memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); 375 376 writel(dev->dev_addr[0] << 16 | dev->dev_addr[1] << 8 | dev-> 377 dev_addr[2], db->membase + EMAC_MAC_A1_REG); 378 writel(dev->dev_addr[3] << 16 | dev->dev_addr[4] << 8 | dev-> 379 dev_addr[5], db->membase + EMAC_MAC_A0_REG); 380 381 return 0; 382 } 383 384 /* Initialize emac board */ 385 static void emac_init_device(struct net_device *dev) 386 { 387 struct emac_board_info *db = netdev_priv(dev); 388 unsigned long flags; 389 unsigned int reg_val; 390 391 spin_lock_irqsave(&db->lock, flags); 392 393 emac_update_speed(dev); 394 emac_update_duplex(dev); 395 396 /* enable RX/TX */ 397 reg_val = readl(db->membase + EMAC_CTL_REG); 398 writel(reg_val | EMAC_CTL_RESET | EMAC_CTL_TX_EN | EMAC_CTL_RX_EN, 399 db->membase + EMAC_CTL_REG); 400 401 /* enable RX/TX0/RX Hlevel interrup */ 402 reg_val = readl(db->membase + EMAC_INT_CTL_REG); 403 reg_val |= (0xf << 0) | (0x01 << 8); 404 writel(reg_val, db->membase + EMAC_INT_CTL_REG); 405 406 spin_unlock_irqrestore(&db->lock, flags); 407 } 408 409 /* Our watchdog timed out. Called by the networking layer */ 410 static void emac_timeout(struct net_device *dev) 411 { 412 struct emac_board_info *db = netdev_priv(dev); 413 unsigned long flags; 414 415 if (netif_msg_timer(db)) 416 dev_err(db->dev, "tx time out.\n"); 417 418 /* Save previous register address */ 419 spin_lock_irqsave(&db->lock, flags); 420 421 netif_stop_queue(dev); 422 emac_reset(db); 423 emac_init_device(dev); 424 /* We can accept TX packets again */ 425 netif_trans_update(dev); 426 netif_wake_queue(dev); 427 428 /* Restore previous register address */ 429 spin_unlock_irqrestore(&db->lock, flags); 430 } 431 432 /* Hardware start transmission. 433 * Send a packet to media from the upper layer. 434 */ 435 static int emac_start_xmit(struct sk_buff *skb, struct net_device *dev) 436 { 437 struct emac_board_info *db = netdev_priv(dev); 438 unsigned long channel; 439 unsigned long flags; 440 441 channel = db->tx_fifo_stat & 3; 442 if (channel == 3) 443 return 1; 444 445 channel = (channel == 1 ? 1 : 0); 446 447 spin_lock_irqsave(&db->lock, flags); 448 449 writel(channel, db->membase + EMAC_TX_INS_REG); 450 451 emac_outblk_32bit(db->membase + EMAC_TX_IO_DATA_REG, 452 skb->data, skb->len); 453 dev->stats.tx_bytes += skb->len; 454 455 db->tx_fifo_stat |= 1 << channel; 456 /* TX control: First packet immediately send, second packet queue */ 457 if (channel == 0) { 458 /* set TX len */ 459 writel(skb->len, db->membase + EMAC_TX_PL0_REG); 460 /* start translate from fifo to phy */ 461 writel(readl(db->membase + EMAC_TX_CTL0_REG) | 1, 462 db->membase + EMAC_TX_CTL0_REG); 463 464 /* save the time stamp */ 465 netif_trans_update(dev); 466 } else if (channel == 1) { 467 /* set TX len */ 468 writel(skb->len, db->membase + EMAC_TX_PL1_REG); 469 /* start translate from fifo to phy */ 470 writel(readl(db->membase + EMAC_TX_CTL1_REG) | 1, 471 db->membase + EMAC_TX_CTL1_REG); 472 473 /* save the time stamp */ 474 netif_trans_update(dev); 475 } 476 477 if ((db->tx_fifo_stat & 3) == 3) { 478 /* Second packet */ 479 netif_stop_queue(dev); 480 } 481 482 spin_unlock_irqrestore(&db->lock, flags); 483 484 /* free this SKB */ 485 dev_consume_skb_any(skb); 486 487 return NETDEV_TX_OK; 488 } 489 490 /* EMAC interrupt handler 491 * receive the packet to upper layer, free the transmitted packet 492 */ 493 static void emac_tx_done(struct net_device *dev, struct emac_board_info *db, 494 unsigned int tx_status) 495 { 496 /* One packet sent complete */ 497 db->tx_fifo_stat &= ~(tx_status & 3); 498 if (3 == (tx_status & 3)) 499 dev->stats.tx_packets += 2; 500 else 501 dev->stats.tx_packets++; 502 503 if (netif_msg_tx_done(db)) 504 dev_dbg(db->dev, "tx done, NSR %02x\n", tx_status); 505 506 netif_wake_queue(dev); 507 } 508 509 /* Received a packet and pass to upper layer 510 */ 511 static void emac_rx(struct net_device *dev) 512 { 513 struct emac_board_info *db = netdev_priv(dev); 514 struct sk_buff *skb; 515 u8 *rdptr; 516 bool good_packet; 517 static int rxlen_last; 518 unsigned int reg_val; 519 u32 rxhdr, rxstatus, rxcount, rxlen; 520 521 /* Check packet ready or not */ 522 while (1) { 523 /* race warning: the first packet might arrive with 524 * the interrupts disabled, but the second will fix 525 * it 526 */ 527 rxcount = readl(db->membase + EMAC_RX_FBC_REG); 528 529 if (netif_msg_rx_status(db)) 530 dev_dbg(db->dev, "RXCount: %x\n", rxcount); 531 532 if ((db->skb_last != NULL) && (rxlen_last > 0)) { 533 dev->stats.rx_bytes += rxlen_last; 534 535 /* Pass to upper layer */ 536 db->skb_last->protocol = eth_type_trans(db->skb_last, 537 dev); 538 netif_rx(db->skb_last); 539 dev->stats.rx_packets++; 540 db->skb_last = NULL; 541 rxlen_last = 0; 542 543 reg_val = readl(db->membase + EMAC_RX_CTL_REG); 544 reg_val &= ~EMAC_RX_CTL_DMA_EN; 545 writel(reg_val, db->membase + EMAC_RX_CTL_REG); 546 } 547 548 if (!rxcount) { 549 db->emacrx_completed_flag = 1; 550 reg_val = readl(db->membase + EMAC_INT_CTL_REG); 551 reg_val |= (0xf << 0) | (0x01 << 8); 552 writel(reg_val, db->membase + EMAC_INT_CTL_REG); 553 554 /* had one stuck? */ 555 rxcount = readl(db->membase + EMAC_RX_FBC_REG); 556 if (!rxcount) 557 return; 558 } 559 560 reg_val = readl(db->membase + EMAC_RX_IO_DATA_REG); 561 if (netif_msg_rx_status(db)) 562 dev_dbg(db->dev, "receive header: %x\n", reg_val); 563 if (reg_val != EMAC_UNDOCUMENTED_MAGIC) { 564 /* disable RX */ 565 reg_val = readl(db->membase + EMAC_CTL_REG); 566 writel(reg_val & ~EMAC_CTL_RX_EN, 567 db->membase + EMAC_CTL_REG); 568 569 /* Flush RX FIFO */ 570 reg_val = readl(db->membase + EMAC_RX_CTL_REG); 571 writel(reg_val | (1 << 3), 572 db->membase + EMAC_RX_CTL_REG); 573 574 do { 575 reg_val = readl(db->membase + EMAC_RX_CTL_REG); 576 } while (reg_val & (1 << 3)); 577 578 /* enable RX */ 579 reg_val = readl(db->membase + EMAC_CTL_REG); 580 writel(reg_val | EMAC_CTL_RX_EN, 581 db->membase + EMAC_CTL_REG); 582 reg_val = readl(db->membase + EMAC_INT_CTL_REG); 583 reg_val |= (0xf << 0) | (0x01 << 8); 584 writel(reg_val, db->membase + EMAC_INT_CTL_REG); 585 586 db->emacrx_completed_flag = 1; 587 588 return; 589 } 590 591 /* A packet ready now & Get status/length */ 592 good_packet = true; 593 594 rxhdr = readl(db->membase + EMAC_RX_IO_DATA_REG); 595 596 if (netif_msg_rx_status(db)) 597 dev_dbg(db->dev, "rxhdr: %x\n", *((int *)(&rxhdr))); 598 599 rxlen = EMAC_RX_IO_DATA_LEN(rxhdr); 600 rxstatus = EMAC_RX_IO_DATA_STATUS(rxhdr); 601 602 if (netif_msg_rx_status(db)) 603 dev_dbg(db->dev, "RX: status %02x, length %04x\n", 604 rxstatus, rxlen); 605 606 /* Packet Status check */ 607 if (rxlen < 0x40) { 608 good_packet = false; 609 if (netif_msg_rx_err(db)) 610 dev_dbg(db->dev, "RX: Bad Packet (runt)\n"); 611 } 612 613 if (unlikely(!(rxstatus & EMAC_RX_IO_DATA_STATUS_OK))) { 614 good_packet = false; 615 616 if (rxstatus & EMAC_RX_IO_DATA_STATUS_CRC_ERR) { 617 if (netif_msg_rx_err(db)) 618 dev_dbg(db->dev, "crc error\n"); 619 dev->stats.rx_crc_errors++; 620 } 621 622 if (rxstatus & EMAC_RX_IO_DATA_STATUS_LEN_ERR) { 623 if (netif_msg_rx_err(db)) 624 dev_dbg(db->dev, "length error\n"); 625 dev->stats.rx_length_errors++; 626 } 627 } 628 629 /* Move data from EMAC */ 630 if (good_packet) { 631 skb = netdev_alloc_skb(dev, rxlen + 4); 632 if (!skb) 633 continue; 634 skb_reserve(skb, 2); 635 rdptr = skb_put(skb, rxlen - 4); 636 637 /* Read received packet from RX SRAM */ 638 if (netif_msg_rx_status(db)) 639 dev_dbg(db->dev, "RxLen %x\n", rxlen); 640 641 emac_inblk_32bit(db->membase + EMAC_RX_IO_DATA_REG, 642 rdptr, rxlen); 643 dev->stats.rx_bytes += rxlen; 644 645 /* Pass to upper layer */ 646 skb->protocol = eth_type_trans(skb, dev); 647 netif_rx(skb); 648 dev->stats.rx_packets++; 649 } 650 } 651 } 652 653 static irqreturn_t emac_interrupt(int irq, void *dev_id) 654 { 655 struct net_device *dev = dev_id; 656 struct emac_board_info *db = netdev_priv(dev); 657 int int_status; 658 unsigned long flags; 659 unsigned int reg_val; 660 661 /* A real interrupt coming */ 662 663 /* holders of db->lock must always block IRQs */ 664 spin_lock_irqsave(&db->lock, flags); 665 666 /* Disable all interrupts */ 667 writel(0, db->membase + EMAC_INT_CTL_REG); 668 669 /* Got EMAC interrupt status */ 670 /* Got ISR */ 671 int_status = readl(db->membase + EMAC_INT_STA_REG); 672 /* Clear ISR status */ 673 writel(int_status, db->membase + EMAC_INT_STA_REG); 674 675 if (netif_msg_intr(db)) 676 dev_dbg(db->dev, "emac interrupt %02x\n", int_status); 677 678 /* Received the coming packet */ 679 if ((int_status & 0x100) && (db->emacrx_completed_flag == 1)) { 680 /* carrier lost */ 681 db->emacrx_completed_flag = 0; 682 emac_rx(dev); 683 } 684 685 /* Transmit Interrupt check */ 686 if (int_status & (0x01 | 0x02)) 687 emac_tx_done(dev, db, int_status); 688 689 if (int_status & (0x04 | 0x08)) 690 netdev_info(dev, " ab : %x\n", int_status); 691 692 /* Re-enable interrupt mask */ 693 if (db->emacrx_completed_flag == 1) { 694 reg_val = readl(db->membase + EMAC_INT_CTL_REG); 695 reg_val |= (0xf << 0) | (0x01 << 8); 696 writel(reg_val, db->membase + EMAC_INT_CTL_REG); 697 } 698 spin_unlock_irqrestore(&db->lock, flags); 699 700 return IRQ_HANDLED; 701 } 702 703 #ifdef CONFIG_NET_POLL_CONTROLLER 704 /* 705 * Used by netconsole 706 */ 707 static void emac_poll_controller(struct net_device *dev) 708 { 709 disable_irq(dev->irq); 710 emac_interrupt(dev->irq, dev); 711 enable_irq(dev->irq); 712 } 713 #endif 714 715 /* Open the interface. 716 * The interface is opened whenever "ifconfig" actives it. 717 */ 718 static int emac_open(struct net_device *dev) 719 { 720 struct emac_board_info *db = netdev_priv(dev); 721 int ret; 722 723 if (netif_msg_ifup(db)) 724 dev_dbg(db->dev, "enabling %s\n", dev->name); 725 726 if (request_irq(dev->irq, &emac_interrupt, 0, dev->name, dev)) 727 return -EAGAIN; 728 729 /* Initialize EMAC board */ 730 emac_reset(db); 731 emac_init_device(dev); 732 733 ret = emac_mdio_probe(dev); 734 if (ret < 0) { 735 free_irq(dev->irq, dev); 736 netdev_err(dev, "cannot probe MDIO bus\n"); 737 return ret; 738 } 739 740 phy_start(dev->phydev); 741 netif_start_queue(dev); 742 743 return 0; 744 } 745 746 static void emac_shutdown(struct net_device *dev) 747 { 748 unsigned int reg_val; 749 struct emac_board_info *db = netdev_priv(dev); 750 751 /* Disable all interrupt */ 752 writel(0, db->membase + EMAC_INT_CTL_REG); 753 754 /* clear interrupt status */ 755 reg_val = readl(db->membase + EMAC_INT_STA_REG); 756 writel(reg_val, db->membase + EMAC_INT_STA_REG); 757 758 /* Disable RX/TX */ 759 reg_val = readl(db->membase + EMAC_CTL_REG); 760 reg_val &= ~(EMAC_CTL_TX_EN | EMAC_CTL_RX_EN | EMAC_CTL_RESET); 761 writel(reg_val, db->membase + EMAC_CTL_REG); 762 } 763 764 /* Stop the interface. 765 * The interface is stopped when it is brought. 766 */ 767 static int emac_stop(struct net_device *ndev) 768 { 769 struct emac_board_info *db = netdev_priv(ndev); 770 771 if (netif_msg_ifdown(db)) 772 dev_dbg(db->dev, "shutting down %s\n", ndev->name); 773 774 netif_stop_queue(ndev); 775 netif_carrier_off(ndev); 776 777 phy_stop(ndev->phydev); 778 779 emac_mdio_remove(ndev); 780 781 emac_shutdown(ndev); 782 783 free_irq(ndev->irq, ndev); 784 785 return 0; 786 } 787 788 static const struct net_device_ops emac_netdev_ops = { 789 .ndo_open = emac_open, 790 .ndo_stop = emac_stop, 791 .ndo_start_xmit = emac_start_xmit, 792 .ndo_tx_timeout = emac_timeout, 793 .ndo_set_rx_mode = emac_set_rx_mode, 794 .ndo_do_ioctl = emac_ioctl, 795 .ndo_validate_addr = eth_validate_addr, 796 .ndo_set_mac_address = emac_set_mac_address, 797 #ifdef CONFIG_NET_POLL_CONTROLLER 798 .ndo_poll_controller = emac_poll_controller, 799 #endif 800 }; 801 802 /* Search EMAC board, allocate space and register it 803 */ 804 static int emac_probe(struct platform_device *pdev) 805 { 806 struct device_node *np = pdev->dev.of_node; 807 struct emac_board_info *db; 808 struct net_device *ndev; 809 int ret = 0; 810 const char *mac_addr; 811 812 ndev = alloc_etherdev(sizeof(struct emac_board_info)); 813 if (!ndev) { 814 dev_err(&pdev->dev, "could not allocate device.\n"); 815 return -ENOMEM; 816 } 817 818 SET_NETDEV_DEV(ndev, &pdev->dev); 819 820 db = netdev_priv(ndev); 821 822 db->dev = &pdev->dev; 823 db->ndev = ndev; 824 db->pdev = pdev; 825 db->msg_enable = netif_msg_init(debug, EMAC_DEFAULT_MSG_ENABLE); 826 827 spin_lock_init(&db->lock); 828 829 db->membase = of_iomap(np, 0); 830 if (!db->membase) { 831 dev_err(&pdev->dev, "failed to remap registers\n"); 832 ret = -ENOMEM; 833 goto out; 834 } 835 836 /* fill in parameters for net-dev structure */ 837 ndev->base_addr = (unsigned long)db->membase; 838 ndev->irq = irq_of_parse_and_map(np, 0); 839 if (ndev->irq == -ENXIO) { 840 netdev_err(ndev, "No irq resource\n"); 841 ret = ndev->irq; 842 goto out_iounmap; 843 } 844 845 db->clk = devm_clk_get(&pdev->dev, NULL); 846 if (IS_ERR(db->clk)) { 847 ret = PTR_ERR(db->clk); 848 goto out_iounmap; 849 } 850 851 ret = clk_prepare_enable(db->clk); 852 if (ret) { 853 dev_err(&pdev->dev, "Error couldn't enable clock (%d)\n", ret); 854 goto out_iounmap; 855 } 856 857 ret = sunxi_sram_claim(&pdev->dev); 858 if (ret) { 859 dev_err(&pdev->dev, "Error couldn't map SRAM to device\n"); 860 goto out_clk_disable_unprepare; 861 } 862 863 db->phy_node = of_parse_phandle(np, "phy", 0); 864 if (!db->phy_node) { 865 dev_err(&pdev->dev, "no associated PHY\n"); 866 ret = -ENODEV; 867 goto out_release_sram; 868 } 869 870 /* Read MAC-address from DT */ 871 mac_addr = of_get_mac_address(np); 872 if (!IS_ERR(mac_addr)) 873 ether_addr_copy(ndev->dev_addr, mac_addr); 874 875 /* Check if the MAC address is valid, if not get a random one */ 876 if (!is_valid_ether_addr(ndev->dev_addr)) { 877 eth_hw_addr_random(ndev); 878 dev_warn(&pdev->dev, "using random MAC address %pM\n", 879 ndev->dev_addr); 880 } 881 882 db->emacrx_completed_flag = 1; 883 emac_powerup(ndev); 884 emac_reset(db); 885 886 ndev->netdev_ops = &emac_netdev_ops; 887 ndev->watchdog_timeo = msecs_to_jiffies(watchdog); 888 ndev->ethtool_ops = &emac_ethtool_ops; 889 890 platform_set_drvdata(pdev, ndev); 891 892 /* Carrier starts down, phylib will bring it up */ 893 netif_carrier_off(ndev); 894 895 ret = register_netdev(ndev); 896 if (ret) { 897 dev_err(&pdev->dev, "Registering netdev failed!\n"); 898 ret = -ENODEV; 899 goto out_release_sram; 900 } 901 902 dev_info(&pdev->dev, "%s: at %p, IRQ %d MAC: %pM\n", 903 ndev->name, db->membase, ndev->irq, ndev->dev_addr); 904 905 return 0; 906 907 out_release_sram: 908 sunxi_sram_release(&pdev->dev); 909 out_clk_disable_unprepare: 910 clk_disable_unprepare(db->clk); 911 out_iounmap: 912 iounmap(db->membase); 913 out: 914 dev_err(db->dev, "not found (%d).\n", ret); 915 916 free_netdev(ndev); 917 918 return ret; 919 } 920 921 static int emac_remove(struct platform_device *pdev) 922 { 923 struct net_device *ndev = platform_get_drvdata(pdev); 924 struct emac_board_info *db = netdev_priv(ndev); 925 926 unregister_netdev(ndev); 927 sunxi_sram_release(&pdev->dev); 928 clk_disable_unprepare(db->clk); 929 iounmap(db->membase); 930 free_netdev(ndev); 931 932 dev_dbg(&pdev->dev, "released and freed device\n"); 933 return 0; 934 } 935 936 static int emac_suspend(struct platform_device *dev, pm_message_t state) 937 { 938 struct net_device *ndev = platform_get_drvdata(dev); 939 940 netif_carrier_off(ndev); 941 netif_device_detach(ndev); 942 emac_shutdown(ndev); 943 944 return 0; 945 } 946 947 static int emac_resume(struct platform_device *dev) 948 { 949 struct net_device *ndev = platform_get_drvdata(dev); 950 struct emac_board_info *db = netdev_priv(ndev); 951 952 emac_reset(db); 953 emac_init_device(ndev); 954 netif_device_attach(ndev); 955 956 return 0; 957 } 958 959 static const struct of_device_id emac_of_match[] = { 960 {.compatible = "allwinner,sun4i-a10-emac",}, 961 962 /* Deprecated */ 963 {.compatible = "allwinner,sun4i-emac",}, 964 {}, 965 }; 966 967 MODULE_DEVICE_TABLE(of, emac_of_match); 968 969 static struct platform_driver emac_driver = { 970 .driver = { 971 .name = "sun4i-emac", 972 .of_match_table = emac_of_match, 973 }, 974 .probe = emac_probe, 975 .remove = emac_remove, 976 .suspend = emac_suspend, 977 .resume = emac_resume, 978 }; 979 980 module_platform_driver(emac_driver); 981 982 MODULE_AUTHOR("Stefan Roese <sr@denx.de>"); 983 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); 984 MODULE_DESCRIPTION("Allwinner A10 emac network driver"); 985 MODULE_LICENSE("GPL"); 986