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