1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright (c) 2013-2016, The Linux Foundation. All rights reserved. 3 */ 4 5 /* Qualcomm Technologies, Inc. EMAC Gigabit Ethernet Driver */ 6 7 #include <linux/if_ether.h> 8 #include <linux/if_vlan.h> 9 #include <linux/interrupt.h> 10 #include <linux/io.h> 11 #include <linux/module.h> 12 #include <linux/of.h> 13 #include <linux/of_net.h> 14 #include <linux/phy.h> 15 #include <linux/platform_device.h> 16 #include <linux/acpi.h> 17 #include "emac.h" 18 #include "emac-mac.h" 19 #include "emac-phy.h" 20 #include "emac-sgmii.h" 21 22 #define EMAC_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK | \ 23 NETIF_MSG_TIMER | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP) 24 25 #define EMAC_RRD_SIZE 4 26 /* The RRD size if timestamping is enabled: */ 27 #define EMAC_TS_RRD_SIZE 6 28 #define EMAC_TPD_SIZE 4 29 #define EMAC_RFD_SIZE 2 30 31 #define REG_MAC_RX_STATUS_BIN EMAC_RXMAC_STATC_REG0 32 #define REG_MAC_RX_STATUS_END EMAC_RXMAC_STATC_REG22 33 #define REG_MAC_TX_STATUS_BIN EMAC_TXMAC_STATC_REG0 34 #define REG_MAC_TX_STATUS_END EMAC_TXMAC_STATC_REG24 35 36 #define RXQ0_NUM_RFD_PREF_DEF 8 37 #define TXQ0_NUM_TPD_PREF_DEF 5 38 39 #define EMAC_PREAMBLE_DEF 7 40 41 #define DMAR_DLY_CNT_DEF 15 42 #define DMAW_DLY_CNT_DEF 4 43 44 #define IMR_NORMAL_MASK (ISR_ERROR | ISR_OVER | ISR_TX_PKT) 45 46 #define ISR_TX_PKT (\ 47 TX_PKT_INT |\ 48 TX_PKT_INT1 |\ 49 TX_PKT_INT2 |\ 50 TX_PKT_INT3) 51 52 #define ISR_OVER (\ 53 RFD0_UR_INT |\ 54 RFD1_UR_INT |\ 55 RFD2_UR_INT |\ 56 RFD3_UR_INT |\ 57 RFD4_UR_INT |\ 58 RXF_OF_INT |\ 59 TXF_UR_INT) 60 61 #define ISR_ERROR (\ 62 DMAR_TO_INT |\ 63 DMAW_TO_INT |\ 64 TXQ_TO_INT) 65 66 /* in sync with enum emac_clk_id */ 67 static const char * const emac_clk_name[] = { 68 "axi_clk", "cfg_ahb_clk", "high_speed_clk", "mdio_clk", "tx_clk", 69 "rx_clk", "sys_clk" 70 }; 71 72 void emac_reg_update32(void __iomem *addr, u32 mask, u32 val) 73 { 74 u32 data = readl(addr); 75 76 writel(((data & ~mask) | val), addr); 77 } 78 79 /* reinitialize */ 80 int emac_reinit_locked(struct emac_adapter *adpt) 81 { 82 int ret; 83 84 mutex_lock(&adpt->reset_lock); 85 86 emac_mac_down(adpt); 87 emac_sgmii_reset(adpt); 88 ret = emac_mac_up(adpt); 89 90 mutex_unlock(&adpt->reset_lock); 91 92 return ret; 93 } 94 95 /* NAPI */ 96 static int emac_napi_rtx(struct napi_struct *napi, int budget) 97 { 98 struct emac_rx_queue *rx_q = 99 container_of(napi, struct emac_rx_queue, napi); 100 struct emac_adapter *adpt = netdev_priv(rx_q->netdev); 101 struct emac_irq *irq = rx_q->irq; 102 int work_done = 0; 103 104 emac_mac_rx_process(adpt, rx_q, &work_done, budget); 105 106 if (work_done < budget) { 107 napi_complete_done(napi, work_done); 108 109 irq->mask |= rx_q->intr; 110 writel(irq->mask, adpt->base + EMAC_INT_MASK); 111 } 112 113 return work_done; 114 } 115 116 /* Transmit the packet */ 117 static netdev_tx_t emac_start_xmit(struct sk_buff *skb, 118 struct net_device *netdev) 119 { 120 struct emac_adapter *adpt = netdev_priv(netdev); 121 122 return emac_mac_tx_buf_send(adpt, &adpt->tx_q, skb); 123 } 124 125 static irqreturn_t emac_isr(int _irq, void *data) 126 { 127 struct emac_irq *irq = data; 128 struct emac_adapter *adpt = 129 container_of(irq, struct emac_adapter, irq); 130 struct emac_rx_queue *rx_q = &adpt->rx_q; 131 u32 isr, status; 132 133 /* disable the interrupt */ 134 writel(0, adpt->base + EMAC_INT_MASK); 135 136 isr = readl_relaxed(adpt->base + EMAC_INT_STATUS); 137 138 status = isr & irq->mask; 139 if (status == 0) 140 goto exit; 141 142 if (status & ISR_ERROR) { 143 net_err_ratelimited("%s: error interrupt 0x%lx\n", 144 adpt->netdev->name, status & ISR_ERROR); 145 /* reset MAC */ 146 schedule_work(&adpt->work_thread); 147 } 148 149 /* Schedule the napi for receive queue with interrupt 150 * status bit set 151 */ 152 if (status & rx_q->intr) { 153 if (napi_schedule_prep(&rx_q->napi)) { 154 irq->mask &= ~rx_q->intr; 155 __napi_schedule(&rx_q->napi); 156 } 157 } 158 159 if (status & TX_PKT_INT) 160 emac_mac_tx_process(adpt, &adpt->tx_q); 161 162 if (status & ISR_OVER) 163 net_warn_ratelimited("%s: TX/RX overflow interrupt\n", 164 adpt->netdev->name); 165 166 exit: 167 /* enable the interrupt */ 168 writel(irq->mask, adpt->base + EMAC_INT_MASK); 169 170 return IRQ_HANDLED; 171 } 172 173 /* Configure VLAN tag strip/insert feature */ 174 static int emac_set_features(struct net_device *netdev, 175 netdev_features_t features) 176 { 177 netdev_features_t changed = features ^ netdev->features; 178 struct emac_adapter *adpt = netdev_priv(netdev); 179 180 /* We only need to reprogram the hardware if the VLAN tag features 181 * have changed, and if it's already running. 182 */ 183 if (!(changed & (NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX))) 184 return 0; 185 186 if (!netif_running(netdev)) 187 return 0; 188 189 /* emac_mac_mode_config() uses netdev->features to configure the EMAC, 190 * so make sure it's set first. 191 */ 192 netdev->features = features; 193 194 return emac_reinit_locked(adpt); 195 } 196 197 /* Configure Multicast and Promiscuous modes */ 198 static void emac_rx_mode_set(struct net_device *netdev) 199 { 200 struct emac_adapter *adpt = netdev_priv(netdev); 201 struct netdev_hw_addr *ha; 202 203 emac_mac_mode_config(adpt); 204 205 /* update multicast address filtering */ 206 emac_mac_multicast_addr_clear(adpt); 207 netdev_for_each_mc_addr(ha, netdev) 208 emac_mac_multicast_addr_set(adpt, ha->addr); 209 } 210 211 /* Change the Maximum Transfer Unit (MTU) */ 212 static int emac_change_mtu(struct net_device *netdev, int new_mtu) 213 { 214 struct emac_adapter *adpt = netdev_priv(netdev); 215 216 netif_dbg(adpt, hw, adpt->netdev, 217 "changing MTU from %d to %d\n", netdev->mtu, 218 new_mtu); 219 WRITE_ONCE(netdev->mtu, new_mtu); 220 221 if (netif_running(netdev)) 222 return emac_reinit_locked(adpt); 223 224 return 0; 225 } 226 227 /* Called when the network interface is made active */ 228 static int emac_open(struct net_device *netdev) 229 { 230 struct emac_adapter *adpt = netdev_priv(netdev); 231 struct emac_irq *irq = &adpt->irq; 232 int ret; 233 234 ret = request_irq(irq->irq, emac_isr, 0, "emac-core0", irq); 235 if (ret) { 236 netdev_err(adpt->netdev, "could not request emac-core0 irq\n"); 237 return ret; 238 } 239 240 /* allocate rx/tx dma buffer & descriptors */ 241 ret = emac_mac_rx_tx_rings_alloc_all(adpt); 242 if (ret) { 243 netdev_err(adpt->netdev, "error allocating rx/tx rings\n"); 244 free_irq(irq->irq, irq); 245 return ret; 246 } 247 248 ret = emac_sgmii_open(adpt); 249 if (ret) { 250 emac_mac_rx_tx_rings_free_all(adpt); 251 free_irq(irq->irq, irq); 252 return ret; 253 } 254 255 ret = emac_mac_up(adpt); 256 if (ret) { 257 emac_mac_rx_tx_rings_free_all(adpt); 258 free_irq(irq->irq, irq); 259 emac_sgmii_close(adpt); 260 return ret; 261 } 262 263 return 0; 264 } 265 266 /* Called when the network interface is disabled */ 267 static int emac_close(struct net_device *netdev) 268 { 269 struct emac_adapter *adpt = netdev_priv(netdev); 270 271 mutex_lock(&adpt->reset_lock); 272 273 emac_sgmii_close(adpt); 274 emac_mac_down(adpt); 275 emac_mac_rx_tx_rings_free_all(adpt); 276 277 free_irq(adpt->irq.irq, &adpt->irq); 278 279 mutex_unlock(&adpt->reset_lock); 280 281 return 0; 282 } 283 284 /* Respond to a TX hang */ 285 static void emac_tx_timeout(struct net_device *netdev, unsigned int txqueue) 286 { 287 struct emac_adapter *adpt = netdev_priv(netdev); 288 289 schedule_work(&adpt->work_thread); 290 } 291 292 /** 293 * emac_update_hw_stats - read the EMAC stat registers 294 * @adpt: pointer to adapter struct 295 * 296 * Reads the stats registers and write the values to adpt->stats. 297 * 298 * adpt->stats.lock must be held while calling this function, 299 * and while reading from adpt->stats. 300 */ 301 void emac_update_hw_stats(struct emac_adapter *adpt) 302 { 303 struct emac_stats *stats = &adpt->stats; 304 u64 *stats_itr = &adpt->stats.rx_ok; 305 void __iomem *base = adpt->base; 306 unsigned int addr; 307 308 addr = REG_MAC_RX_STATUS_BIN; 309 while (addr <= REG_MAC_RX_STATUS_END) { 310 *stats_itr += readl_relaxed(base + addr); 311 stats_itr++; 312 addr += sizeof(u32); 313 } 314 315 /* additional rx status */ 316 stats->rx_crc_align += readl_relaxed(base + EMAC_RXMAC_STATC_REG23); 317 stats->rx_jabbers += readl_relaxed(base + EMAC_RXMAC_STATC_REG24); 318 319 /* update tx status */ 320 addr = REG_MAC_TX_STATUS_BIN; 321 stats_itr = &stats->tx_ok; 322 323 while (addr <= REG_MAC_TX_STATUS_END) { 324 *stats_itr += readl_relaxed(base + addr); 325 stats_itr++; 326 addr += sizeof(u32); 327 } 328 329 /* additional tx status */ 330 stats->tx_col += readl_relaxed(base + EMAC_TXMAC_STATC_REG25); 331 } 332 333 /* Provide network statistics info for the interface */ 334 static void emac_get_stats64(struct net_device *netdev, 335 struct rtnl_link_stats64 *net_stats) 336 { 337 struct emac_adapter *adpt = netdev_priv(netdev); 338 struct emac_stats *stats = &adpt->stats; 339 340 spin_lock(&stats->lock); 341 342 emac_update_hw_stats(adpt); 343 344 /* return parsed statistics */ 345 net_stats->rx_packets = stats->rx_ok; 346 net_stats->tx_packets = stats->tx_ok; 347 net_stats->rx_bytes = stats->rx_byte_cnt; 348 net_stats->tx_bytes = stats->tx_byte_cnt; 349 net_stats->multicast = stats->rx_mcast; 350 net_stats->collisions = stats->tx_1_col + stats->tx_2_col * 2 + 351 stats->tx_late_col + stats->tx_abort_col; 352 353 net_stats->rx_errors = stats->rx_frag + stats->rx_fcs_err + 354 stats->rx_len_err + stats->rx_sz_ov + 355 stats->rx_align_err; 356 net_stats->rx_fifo_errors = stats->rx_rxf_ov; 357 net_stats->rx_length_errors = stats->rx_len_err; 358 net_stats->rx_crc_errors = stats->rx_fcs_err; 359 net_stats->rx_frame_errors = stats->rx_align_err; 360 net_stats->rx_over_errors = stats->rx_rxf_ov; 361 net_stats->rx_missed_errors = stats->rx_rxf_ov; 362 363 net_stats->tx_errors = stats->tx_late_col + stats->tx_abort_col + 364 stats->tx_underrun + stats->tx_trunc; 365 net_stats->tx_fifo_errors = stats->tx_underrun; 366 net_stats->tx_aborted_errors = stats->tx_abort_col; 367 net_stats->tx_window_errors = stats->tx_late_col; 368 369 spin_unlock(&stats->lock); 370 } 371 372 static const struct net_device_ops emac_netdev_ops = { 373 .ndo_open = emac_open, 374 .ndo_stop = emac_close, 375 .ndo_validate_addr = eth_validate_addr, 376 .ndo_start_xmit = emac_start_xmit, 377 .ndo_set_mac_address = eth_mac_addr, 378 .ndo_change_mtu = emac_change_mtu, 379 .ndo_eth_ioctl = phy_do_ioctl_running, 380 .ndo_tx_timeout = emac_tx_timeout, 381 .ndo_get_stats64 = emac_get_stats64, 382 .ndo_set_features = emac_set_features, 383 .ndo_set_rx_mode = emac_rx_mode_set, 384 }; 385 386 /* Watchdog task routine, called to reinitialize the EMAC */ 387 static void emac_work_thread(struct work_struct *work) 388 { 389 struct emac_adapter *adpt = 390 container_of(work, struct emac_adapter, work_thread); 391 392 emac_reinit_locked(adpt); 393 } 394 395 /* Initialize various data structures */ 396 static void emac_init_adapter(struct emac_adapter *adpt) 397 { 398 u32 reg; 399 400 adpt->rrd_size = EMAC_RRD_SIZE; 401 adpt->tpd_size = EMAC_TPD_SIZE; 402 adpt->rfd_size = EMAC_RFD_SIZE; 403 404 /* descriptors */ 405 adpt->tx_desc_cnt = EMAC_DEF_TX_DESCS; 406 adpt->rx_desc_cnt = EMAC_DEF_RX_DESCS; 407 408 /* dma */ 409 adpt->dma_order = emac_dma_ord_out; 410 adpt->dmar_block = emac_dma_req_4096; 411 adpt->dmaw_block = emac_dma_req_128; 412 adpt->dmar_dly_cnt = DMAR_DLY_CNT_DEF; 413 adpt->dmaw_dly_cnt = DMAW_DLY_CNT_DEF; 414 adpt->tpd_burst = TXQ0_NUM_TPD_PREF_DEF; 415 adpt->rfd_burst = RXQ0_NUM_RFD_PREF_DEF; 416 417 /* irq moderator */ 418 reg = ((EMAC_DEF_RX_IRQ_MOD >> 1) << IRQ_MODERATOR2_INIT_SHFT) | 419 ((EMAC_DEF_TX_IRQ_MOD >> 1) << IRQ_MODERATOR_INIT_SHFT); 420 adpt->irq_mod = reg; 421 422 /* others */ 423 adpt->preamble = EMAC_PREAMBLE_DEF; 424 425 /* default to automatic flow control */ 426 adpt->automatic = true; 427 428 /* Disable single-pause-frame mode by default */ 429 adpt->single_pause_mode = false; 430 } 431 432 /* Get the clock */ 433 static int emac_clks_get(struct platform_device *pdev, 434 struct emac_adapter *adpt) 435 { 436 unsigned int i; 437 438 for (i = 0; i < EMAC_CLK_CNT; i++) { 439 struct clk *clk = devm_clk_get(&pdev->dev, emac_clk_name[i]); 440 441 if (IS_ERR(clk)) { 442 dev_err(&pdev->dev, 443 "could not claim clock %s (error=%li)\n", 444 emac_clk_name[i], PTR_ERR(clk)); 445 446 return PTR_ERR(clk); 447 } 448 449 adpt->clk[i] = clk; 450 } 451 452 return 0; 453 } 454 455 /* Initialize clocks */ 456 static int emac_clks_phase1_init(struct platform_device *pdev, 457 struct emac_adapter *adpt) 458 { 459 int ret; 460 461 /* On ACPI platforms, clocks are controlled by firmware and/or 462 * ACPI, not by drivers. 463 */ 464 if (has_acpi_companion(&pdev->dev)) 465 return 0; 466 467 ret = emac_clks_get(pdev, adpt); 468 if (ret) 469 return ret; 470 471 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_AXI]); 472 if (ret) 473 return ret; 474 475 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_CFG_AHB]); 476 if (ret) 477 goto disable_clk_axi; 478 479 ret = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], 19200000); 480 if (ret) 481 goto disable_clk_cfg_ahb; 482 483 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_HIGH_SPEED]); 484 if (ret) 485 goto disable_clk_cfg_ahb; 486 487 return 0; 488 489 disable_clk_cfg_ahb: 490 clk_disable_unprepare(adpt->clk[EMAC_CLK_CFG_AHB]); 491 disable_clk_axi: 492 clk_disable_unprepare(adpt->clk[EMAC_CLK_AXI]); 493 494 return ret; 495 } 496 497 /* Enable clocks; needs emac_clks_phase1_init to be called before */ 498 static int emac_clks_phase2_init(struct platform_device *pdev, 499 struct emac_adapter *adpt) 500 { 501 int ret; 502 503 if (has_acpi_companion(&pdev->dev)) 504 return 0; 505 506 ret = clk_set_rate(adpt->clk[EMAC_CLK_TX], 125000000); 507 if (ret) 508 return ret; 509 510 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_TX]); 511 if (ret) 512 return ret; 513 514 ret = clk_set_rate(adpt->clk[EMAC_CLK_HIGH_SPEED], 125000000); 515 if (ret) 516 return ret; 517 518 ret = clk_set_rate(adpt->clk[EMAC_CLK_MDIO], 25000000); 519 if (ret) 520 return ret; 521 522 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_MDIO]); 523 if (ret) 524 return ret; 525 526 ret = clk_prepare_enable(adpt->clk[EMAC_CLK_RX]); 527 if (ret) 528 return ret; 529 530 return clk_prepare_enable(adpt->clk[EMAC_CLK_SYS]); 531 } 532 533 static void emac_clks_teardown(struct emac_adapter *adpt) 534 { 535 536 unsigned int i; 537 538 for (i = 0; i < EMAC_CLK_CNT; i++) 539 clk_disable_unprepare(adpt->clk[i]); 540 } 541 542 /* Get the resources */ 543 static int emac_probe_resources(struct platform_device *pdev, 544 struct emac_adapter *adpt) 545 { 546 struct net_device *netdev = adpt->netdev; 547 int ret = 0; 548 549 /* get mac address */ 550 if (device_get_ethdev_address(&pdev->dev, netdev)) 551 eth_hw_addr_random(netdev); 552 553 /* Core 0 interrupt */ 554 ret = platform_get_irq(pdev, 0); 555 if (ret < 0) 556 return ret; 557 adpt->irq.irq = ret; 558 559 /* base register address */ 560 adpt->base = devm_platform_ioremap_resource(pdev, 0); 561 if (IS_ERR(adpt->base)) 562 return PTR_ERR(adpt->base); 563 564 /* CSR register address */ 565 adpt->csr = devm_platform_ioremap_resource(pdev, 1); 566 if (IS_ERR(adpt->csr)) 567 return PTR_ERR(adpt->csr); 568 569 netdev->base_addr = (unsigned long)adpt->base; 570 571 return 0; 572 } 573 574 static const struct of_device_id emac_dt_match[] = { 575 { 576 .compatible = "qcom,fsm9900-emac", 577 }, 578 {} 579 }; 580 MODULE_DEVICE_TABLE(of, emac_dt_match); 581 582 #if IS_ENABLED(CONFIG_ACPI) 583 static const struct acpi_device_id emac_acpi_match[] = { 584 { 585 .id = "QCOM8070", 586 }, 587 {} 588 }; 589 MODULE_DEVICE_TABLE(acpi, emac_acpi_match); 590 #endif 591 592 static int emac_probe(struct platform_device *pdev) 593 { 594 struct net_device *netdev; 595 struct emac_adapter *adpt; 596 struct emac_sgmii *phy; 597 u16 devid, revid; 598 u32 reg; 599 int ret; 600 601 /* The TPD buffer address is limited to: 602 * 1. PTP: 45bits. (Driver doesn't support yet.) 603 * 2. NON-PTP: 46bits. 604 */ 605 ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(46)); 606 if (ret) { 607 dev_err(&pdev->dev, "could not set DMA mask\n"); 608 return ret; 609 } 610 611 netdev = alloc_etherdev(sizeof(struct emac_adapter)); 612 if (!netdev) 613 return -ENOMEM; 614 615 dev_set_drvdata(&pdev->dev, netdev); 616 SET_NETDEV_DEV(netdev, &pdev->dev); 617 emac_set_ethtool_ops(netdev); 618 619 adpt = netdev_priv(netdev); 620 adpt->netdev = netdev; 621 adpt->msg_enable = EMAC_MSG_DEFAULT; 622 623 phy = &adpt->phy; 624 atomic_set(&phy->decode_error_count, 0); 625 626 mutex_init(&adpt->reset_lock); 627 spin_lock_init(&adpt->stats.lock); 628 629 adpt->irq.mask = RX_PKT_INT0 | IMR_NORMAL_MASK; 630 631 ret = emac_probe_resources(pdev, adpt); 632 if (ret) 633 goto err_undo_netdev; 634 635 /* initialize clocks */ 636 ret = emac_clks_phase1_init(pdev, adpt); 637 if (ret) { 638 dev_err(&pdev->dev, "could not initialize clocks\n"); 639 goto err_undo_netdev; 640 } 641 642 netdev->watchdog_timeo = EMAC_WATCHDOG_TIME; 643 netdev->irq = adpt->irq.irq; 644 645 netdev->netdev_ops = &emac_netdev_ops; 646 647 emac_init_adapter(adpt); 648 649 /* init external phy */ 650 ret = emac_phy_config(pdev, adpt); 651 if (ret) 652 goto err_undo_clocks; 653 654 /* init internal sgmii phy */ 655 ret = emac_sgmii_config(pdev, adpt); 656 if (ret) 657 goto err_undo_mdiobus; 658 659 /* enable clocks */ 660 ret = emac_clks_phase2_init(pdev, adpt); 661 if (ret) { 662 dev_err(&pdev->dev, "could not initialize clocks\n"); 663 goto err_undo_mdiobus; 664 } 665 666 /* set hw features */ 667 netdev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM | 668 NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_HW_VLAN_CTAG_RX | 669 NETIF_F_HW_VLAN_CTAG_TX; 670 netdev->hw_features = netdev->features; 671 672 netdev->vlan_features |= NETIF_F_SG | NETIF_F_HW_CSUM | 673 NETIF_F_TSO | NETIF_F_TSO6; 674 675 /* MTU range: 46 - 9194 */ 676 netdev->min_mtu = EMAC_MIN_ETH_FRAME_SIZE - 677 (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN); 678 netdev->max_mtu = EMAC_MAX_ETH_FRAME_SIZE - 679 (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN); 680 681 INIT_WORK(&adpt->work_thread, emac_work_thread); 682 683 /* Initialize queues */ 684 emac_mac_rx_tx_ring_init_all(pdev, adpt); 685 686 netif_napi_add(netdev, &adpt->rx_q.napi, emac_napi_rtx); 687 688 ret = register_netdev(netdev); 689 if (ret) { 690 dev_err(&pdev->dev, "could not register net device\n"); 691 goto err_undo_napi; 692 } 693 694 reg = readl_relaxed(adpt->base + EMAC_DMA_MAS_CTRL); 695 devid = (reg & DEV_ID_NUM_BMSK) >> DEV_ID_NUM_SHFT; 696 revid = (reg & DEV_REV_NUM_BMSK) >> DEV_REV_NUM_SHFT; 697 reg = readl_relaxed(adpt->base + EMAC_CORE_HW_VERSION); 698 699 netif_info(adpt, probe, netdev, 700 "hardware id %d.%d, hardware version %d.%d.%d\n", 701 devid, revid, 702 (reg & MAJOR_BMSK) >> MAJOR_SHFT, 703 (reg & MINOR_BMSK) >> MINOR_SHFT, 704 (reg & STEP_BMSK) >> STEP_SHFT); 705 706 return 0; 707 708 err_undo_napi: 709 netif_napi_del(&adpt->rx_q.napi); 710 err_undo_mdiobus: 711 put_device(&adpt->phydev->mdio.dev); 712 mdiobus_unregister(adpt->mii_bus); 713 err_undo_clocks: 714 emac_clks_teardown(adpt); 715 err_undo_netdev: 716 free_netdev(netdev); 717 718 return ret; 719 } 720 721 static void emac_remove(struct platform_device *pdev) 722 { 723 struct net_device *netdev = dev_get_drvdata(&pdev->dev); 724 struct emac_adapter *adpt = netdev_priv(netdev); 725 726 netif_carrier_off(netdev); 727 netif_tx_disable(netdev); 728 729 unregister_netdev(netdev); 730 netif_napi_del(&adpt->rx_q.napi); 731 732 free_irq(adpt->irq.irq, &adpt->irq); 733 cancel_work_sync(&adpt->work_thread); 734 735 emac_clks_teardown(adpt); 736 737 put_device(&adpt->phydev->mdio.dev); 738 mdiobus_unregister(adpt->mii_bus); 739 740 if (adpt->phy.digital) 741 iounmap(adpt->phy.digital); 742 iounmap(adpt->phy.base); 743 744 free_netdev(netdev); 745 } 746 747 static void emac_shutdown(struct platform_device *pdev) 748 { 749 struct net_device *netdev = dev_get_drvdata(&pdev->dev); 750 struct emac_adapter *adpt = netdev_priv(netdev); 751 752 if (netdev->flags & IFF_UP) { 753 /* Closing the SGMII turns off its interrupts */ 754 emac_sgmii_close(adpt); 755 756 /* Resetting the MAC turns off all DMA and its interrupts */ 757 emac_mac_reset(adpt); 758 } 759 } 760 761 static struct platform_driver emac_platform_driver = { 762 .probe = emac_probe, 763 .remove_new = emac_remove, 764 .driver = { 765 .name = "qcom-emac", 766 .of_match_table = emac_dt_match, 767 .acpi_match_table = ACPI_PTR(emac_acpi_match), 768 }, 769 .shutdown = emac_shutdown, 770 }; 771 772 module_platform_driver(emac_platform_driver); 773 774 MODULE_DESCRIPTION("Qualcomm EMAC Gigabit Ethernet driver"); 775 MODULE_LICENSE("GPL v2"); 776 MODULE_ALIAS("platform:qcom-emac"); 777