linux/drivers/net/ethernet/qualcomm/emac/emac.c
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   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 */
  68static 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
  73void 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 */
  81int 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 */
  97static 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 */
 118static 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
 126static 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
 167exit:
 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 */
 175static 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 */
 199static 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) */
 213static 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 */
 229static 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 */
 268static 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 */
 286static 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 */
 302void 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 */
 335static 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
 373static 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_do_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 */
 388static 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  */
 397static 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 */
 434static 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 */
 457static 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
 490disable_clk_cfg_ahb:
 491        clk_disable_unprepare(adpt->clk[EMAC_CLK_CFG_AHB]);
 492disable_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 */
 499static 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
 534static 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 */
 544static int emac_probe_resources(struct platform_device *pdev,
 545                                struct emac_adapter *adpt)
 546{
 547        struct net_device *netdev = adpt->netdev;
 548        char maddr[ETH_ALEN];
 549        int ret = 0;
 550
 551        /* get mac address */
 552        if (device_get_mac_address(&pdev->dev, maddr, ETH_ALEN))
 553                ether_addr_copy(netdev->dev_addr, maddr);
 554        else
 555                eth_hw_addr_random(netdev);
 556
 557        /* Core 0 interrupt */
 558        ret = platform_get_irq(pdev, 0);
 559        if (ret < 0)
 560                return ret;
 561        adpt->irq.irq = ret;
 562
 563        /* base register address */
 564        adpt->base = devm_platform_ioremap_resource(pdev, 0);
 565        if (IS_ERR(adpt->base))
 566                return PTR_ERR(adpt->base);
 567
 568        /* CSR register address */
 569        adpt->csr = devm_platform_ioremap_resource(pdev, 1);
 570        if (IS_ERR(adpt->csr))
 571                return PTR_ERR(adpt->csr);
 572
 573        netdev->base_addr = (unsigned long)adpt->base;
 574
 575        return 0;
 576}
 577
 578static const struct of_device_id emac_dt_match[] = {
 579        {
 580                .compatible = "qcom,fsm9900-emac",
 581        },
 582        {}
 583};
 584MODULE_DEVICE_TABLE(of, emac_dt_match);
 585
 586#if IS_ENABLED(CONFIG_ACPI)
 587static const struct acpi_device_id emac_acpi_match[] = {
 588        {
 589                .id = "QCOM8070",
 590        },
 591        {}
 592};
 593MODULE_DEVICE_TABLE(acpi, emac_acpi_match);
 594#endif
 595
 596static int emac_probe(struct platform_device *pdev)
 597{
 598        struct net_device *netdev;
 599        struct emac_adapter *adpt;
 600        struct emac_sgmii *phy;
 601        u16 devid, revid;
 602        u32 reg;
 603        int ret;
 604
 605        /* The TPD buffer address is limited to:
 606         * 1. PTP:      45bits. (Driver doesn't support yet.)
 607         * 2. NON-PTP:  46bits.
 608         */
 609        ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(46));
 610        if (ret) {
 611                dev_err(&pdev->dev, "could not set DMA mask\n");
 612                return ret;
 613        }
 614
 615        netdev = alloc_etherdev(sizeof(struct emac_adapter));
 616        if (!netdev)
 617                return -ENOMEM;
 618
 619        dev_set_drvdata(&pdev->dev, netdev);
 620        SET_NETDEV_DEV(netdev, &pdev->dev);
 621        emac_set_ethtool_ops(netdev);
 622
 623        adpt = netdev_priv(netdev);
 624        adpt->netdev = netdev;
 625        adpt->msg_enable = EMAC_MSG_DEFAULT;
 626
 627        phy = &adpt->phy;
 628        atomic_set(&phy->decode_error_count, 0);
 629
 630        mutex_init(&adpt->reset_lock);
 631        spin_lock_init(&adpt->stats.lock);
 632
 633        adpt->irq.mask = RX_PKT_INT0 | IMR_NORMAL_MASK;
 634
 635        ret = emac_probe_resources(pdev, adpt);
 636        if (ret)
 637                goto err_undo_netdev;
 638
 639        /* initialize clocks */
 640        ret = emac_clks_phase1_init(pdev, adpt);
 641        if (ret) {
 642                dev_err(&pdev->dev, "could not initialize clocks\n");
 643                goto err_undo_netdev;
 644        }
 645
 646        netdev->watchdog_timeo = EMAC_WATCHDOG_TIME;
 647        netdev->irq = adpt->irq.irq;
 648
 649        netdev->netdev_ops = &emac_netdev_ops;
 650
 651        emac_init_adapter(adpt);
 652
 653        /* init external phy */
 654        ret = emac_phy_config(pdev, adpt);
 655        if (ret)
 656                goto err_undo_clocks;
 657
 658        /* init internal sgmii phy */
 659        ret = emac_sgmii_config(pdev, adpt);
 660        if (ret)
 661                goto err_undo_mdiobus;
 662
 663        /* enable clocks */
 664        ret = emac_clks_phase2_init(pdev, adpt);
 665        if (ret) {
 666                dev_err(&pdev->dev, "could not initialize clocks\n");
 667                goto err_undo_mdiobus;
 668        }
 669
 670        /* set hw features */
 671        netdev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_RXCSUM |
 672                        NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_HW_VLAN_CTAG_RX |
 673                        NETIF_F_HW_VLAN_CTAG_TX;
 674        netdev->hw_features = netdev->features;
 675
 676        netdev->vlan_features |= NETIF_F_SG | NETIF_F_HW_CSUM |
 677                                 NETIF_F_TSO | NETIF_F_TSO6;
 678
 679        /* MTU range: 46 - 9194 */
 680        netdev->min_mtu = EMAC_MIN_ETH_FRAME_SIZE -
 681                          (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
 682        netdev->max_mtu = EMAC_MAX_ETH_FRAME_SIZE -
 683                          (ETH_HLEN + ETH_FCS_LEN + VLAN_HLEN);
 684
 685        INIT_WORK(&adpt->work_thread, emac_work_thread);
 686
 687        /* Initialize queues */
 688        emac_mac_rx_tx_ring_init_all(pdev, adpt);
 689
 690        netif_napi_add(netdev, &adpt->rx_q.napi, emac_napi_rtx,
 691                       NAPI_POLL_WEIGHT);
 692
 693        ret = register_netdev(netdev);
 694        if (ret) {
 695                dev_err(&pdev->dev, "could not register net device\n");
 696                goto err_undo_napi;
 697        }
 698
 699        reg =  readl_relaxed(adpt->base + EMAC_DMA_MAS_CTRL);
 700        devid = (reg & DEV_ID_NUM_BMSK)  >> DEV_ID_NUM_SHFT;
 701        revid = (reg & DEV_REV_NUM_BMSK) >> DEV_REV_NUM_SHFT;
 702        reg = readl_relaxed(adpt->base + EMAC_CORE_HW_VERSION);
 703
 704        netif_info(adpt, probe, netdev,
 705                   "hardware id %d.%d, hardware version %d.%d.%d\n",
 706                   devid, revid,
 707                   (reg & MAJOR_BMSK) >> MAJOR_SHFT,
 708                   (reg & MINOR_BMSK) >> MINOR_SHFT,
 709                   (reg & STEP_BMSK)  >> STEP_SHFT);
 710
 711        return 0;
 712
 713err_undo_napi:
 714        netif_napi_del(&adpt->rx_q.napi);
 715err_undo_mdiobus:
 716        put_device(&adpt->phydev->mdio.dev);
 717        mdiobus_unregister(adpt->mii_bus);
 718err_undo_clocks:
 719        emac_clks_teardown(adpt);
 720err_undo_netdev:
 721        free_netdev(netdev);
 722
 723        return ret;
 724}
 725
 726static int emac_remove(struct platform_device *pdev)
 727{
 728        struct net_device *netdev = dev_get_drvdata(&pdev->dev);
 729        struct emac_adapter *adpt = netdev_priv(netdev);
 730
 731        unregister_netdev(netdev);
 732        netif_napi_del(&adpt->rx_q.napi);
 733
 734        emac_clks_teardown(adpt);
 735
 736        put_device(&adpt->phydev->mdio.dev);
 737        mdiobus_unregister(adpt->mii_bus);
 738
 739        if (adpt->phy.digital)
 740                iounmap(adpt->phy.digital);
 741        iounmap(adpt->phy.base);
 742
 743        free_netdev(netdev);
 744
 745        return 0;
 746}
 747
 748static void emac_shutdown(struct platform_device *pdev)
 749{
 750        struct net_device *netdev = dev_get_drvdata(&pdev->dev);
 751        struct emac_adapter *adpt = netdev_priv(netdev);
 752
 753        if (netdev->flags & IFF_UP) {
 754                /* Closing the SGMII turns off its interrupts */
 755                emac_sgmii_close(adpt);
 756
 757                /* Resetting the MAC turns off all DMA and its interrupts */
 758                emac_mac_reset(adpt);
 759        }
 760}
 761
 762static struct platform_driver emac_platform_driver = {
 763        .probe  = emac_probe,
 764        .remove = emac_remove,
 765        .driver = {
 766                .name           = "qcom-emac",
 767                .of_match_table = emac_dt_match,
 768                .acpi_match_table = ACPI_PTR(emac_acpi_match),
 769        },
 770        .shutdown = emac_shutdown,
 771};
 772
 773module_platform_driver(emac_platform_driver);
 774
 775MODULE_LICENSE("GPL v2");
 776MODULE_ALIAS("platform:qcom-emac");
 777
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