drivers/net/ethernet/apm/xgene/xgene_enet_main.c

   1 /* Applied Micro X-Gene SoC Ethernet Driver
   2  *
   3  * Copyright (c) 2014, Applied Micro Circuits Corporation
   4  * Authors: Iyappan Subramanian <isubramanian@apm.com>
   5  *          Ravi Patel <rapatel@apm.com>
   6  *          Keyur Chudgar <kchudgar@apm.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "xgene_enet_main.h"
  23 #include "xgene_enet_hw.h"
  24 #include "xgene_enet_sgmac.h"
  25 #include "xgene_enet_xgmac.h"
  26
  27 #define RES_ENET_CSR    0
  28 #define RES_RING_CSR    1
  29 #define RES_RING_CMD    2
  30
  31 static const struct of_device_id xgene_enet_of_match[];
  32 static const struct acpi_device_id xgene_enet_acpi_match[];
  33
  34 static void xgene_enet_init_bufpool(struct xgene_enet_desc_ring *buf_pool)
  35 {
  36         struct xgene_enet_raw_desc16 *raw_desc;
  37         int i;
  38
  39         for (i = 0; i < buf_pool->slots; i++) {
  40                 raw_desc = &buf_pool->raw_desc16[i];
  41
  42                 /* Hardware expects descriptor in little endian format */
  43                 raw_desc->m0 = cpu_to_le64(i |
  44                                 SET_VAL(FPQNUM, buf_pool->dst_ring_num) |
  45                                 SET_VAL(STASH, 3));
  46         }
  47 }
  48
  49 static int xgene_enet_refill_bufpool(struct xgene_enet_desc_ring *buf_pool,
  50                                      u32 nbuf)
  51 {
  52         struct sk_buff *skb;
  53         struct xgene_enet_raw_desc16 *raw_desc;
  54         struct xgene_enet_pdata *pdata;
  55         struct net_device *ndev;
  56         struct device *dev;
  57         dma_addr_t dma_addr;
  58         u32 tail = buf_pool->tail;
  59         u32 slots = buf_pool->slots - 1;
  60         u16 bufdatalen, len;
  61         int i;
  62
  63         ndev = buf_pool->ndev;
  64         dev = ndev_to_dev(buf_pool->ndev);
  65         pdata = netdev_priv(ndev);
  66         bufdatalen = BUF_LEN_CODE_2K | (SKB_BUFFER_SIZE & GENMASK(11, 0));
  67         len = XGENE_ENET_MAX_MTU;
  68
  69         for (i = 0; i < nbuf; i++) {
  70                 raw_desc = &buf_pool->raw_desc16[tail];
  71
  72                 skb = netdev_alloc_skb_ip_align(ndev, len);
  73                 if (unlikely(!skb))
  74                         return -ENOMEM;
  75                 buf_pool->rx_skb[tail] = skb;
  76
  77                 dma_addr = dma_map_single(dev, skb->data, len, DMA_FROM_DEVICE);
  78                 if (dma_mapping_error(dev, dma_addr)) {
  79                         netdev_err(ndev, "DMA mapping error\n");
  80                         dev_kfree_skb_any(skb);
  81                         return -EINVAL;
  82                 }
  83
  84                 raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
  85                                            SET_VAL(BUFDATALEN, bufdatalen) |
  86                                            SET_BIT(COHERENT));
  87                 tail = (tail + 1) & slots;
  88         }
  89
  90         pdata->ring_ops->wr_cmd(buf_pool, nbuf);
  91         buf_pool->tail = tail;
  92
  93         return 0;
  94 }
  95
  96 static u16 xgene_enet_dst_ring_num(struct xgene_enet_desc_ring *ring)
  97 {
  98         struct xgene_enet_pdata *pdata = netdev_priv(ring->ndev);
  99
 100         return ((u16)pdata->rm << 10) | ring->num;
 101 }
 102
 103 static u8 xgene_enet_hdr_len(const void *data)
 104 {
 105         const struct ethhdr *eth = data;
 106
 107         return (eth->h_proto == htons(ETH_P_8021Q)) ? VLAN_ETH_HLEN : ETH_HLEN;
 108 }
 109
 110 static void xgene_enet_delete_bufpool(struct xgene_enet_desc_ring *buf_pool)
 111 {
 112         struct xgene_enet_pdata *pdata = netdev_priv(buf_pool->ndev);
 113         struct xgene_enet_raw_desc16 *raw_desc;
 114         u32 slots = buf_pool->slots - 1;
 115         u32 tail = buf_pool->tail;
 116         u32 userinfo;
 117         int i, len;
 118
 119         len = pdata->ring_ops->len(buf_pool);
 120         for (i = 0; i < len; i++) {
 121                 tail = (tail - 1) & slots;
 122                 raw_desc = &buf_pool->raw_desc16[tail];
 123
 124                 /* Hardware stores descriptor in little endian format */
 125                 userinfo = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
 126                 dev_kfree_skb_any(buf_pool->rx_skb[userinfo]);
 127         }
 128
 129         pdata->ring_ops->wr_cmd(buf_pool, -len);
 130         buf_pool->tail = tail;
 131 }
 132
 133 static irqreturn_t xgene_enet_rx_irq(const int irq, void *data)
 134 {
 135         struct xgene_enet_desc_ring *rx_ring = data;
 136
 137         if (napi_schedule_prep(&rx_ring->napi)) {
 138                 disable_irq_nosync(irq);
 139                 __napi_schedule(&rx_ring->napi);
 140         }
 141
 142         return IRQ_HANDLED;
 143 }
 144
 145 static int xgene_enet_tx_completion(struct xgene_enet_desc_ring *cp_ring,
 146                                     struct xgene_enet_raw_desc *raw_desc)
 147 {
 148         struct sk_buff *skb;
 149         struct device *dev;
 150         u16 skb_index;
 151         u8 status;
 152         int ret = 0;
 153
 154         skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
 155         skb = cp_ring->cp_skb[skb_index];
 156
 157         dev = ndev_to_dev(cp_ring->ndev);
 158         dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
 159                          GET_VAL(BUFDATALEN, le64_to_cpu(raw_desc->m1)),
 160                          DMA_TO_DEVICE);
 161
 162         /* Checking for error */
 163         status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
 164         if (unlikely(status > 2)) {
 165                 xgene_enet_parse_error(cp_ring, netdev_priv(cp_ring->ndev),
 166                                        status);
 167                 ret = -EIO;
 168         }
 169
 170         if (likely(skb)) {
 171                 dev_kfree_skb_any(skb);
 172         } else {
 173                 netdev_err(cp_ring->ndev, "completion skb is NULL\n");
 174                 ret = -EIO;
 175         }
 176
 177         return ret;
 178 }
 179
 180 static u64 xgene_enet_work_msg(struct sk_buff *skb)
 181 {
 182         struct iphdr *iph;
 183         u8 l3hlen, l4hlen = 0;
 184         u8 csum_enable = 0;
 185         u8 proto = 0;
 186         u8 ethhdr;
 187         u64 hopinfo;
 188
 189         if (unlikely(skb->protocol != htons(ETH_P_IP)) &&
 190             unlikely(skb->protocol != htons(ETH_P_8021Q)))
 191                 goto out;
 192
 193         if (unlikely(!(skb->dev->features & NETIF_F_IP_CSUM)))
 194                 goto out;
 195
 196         iph = ip_hdr(skb);
 197         if (unlikely(ip_is_fragment(iph)))
 198                 goto out;
 199
 200         if (likely(iph->protocol == IPPROTO_TCP)) {
 201                 l4hlen = tcp_hdrlen(skb) >> 2;
 202                 csum_enable = 1;
 203                 proto = TSO_IPPROTO_TCP;
 204         } else if (iph->protocol == IPPROTO_UDP) {
 205                 l4hlen = UDP_HDR_SIZE;
 206                 csum_enable = 1;
 207         }
 208 out:
 209         l3hlen = ip_hdrlen(skb) >> 2;
 210         ethhdr = xgene_enet_hdr_len(skb->data);
 211         hopinfo = SET_VAL(TCPHDR, l4hlen) |
 212                   SET_VAL(IPHDR, l3hlen) |
 213                   SET_VAL(ETHHDR, ethhdr) |
 214                   SET_VAL(EC, csum_enable) |
 215                   SET_VAL(IS, proto) |
 216                   SET_BIT(IC) |
 217                   SET_BIT(TYPE_ETH_WORK_MESSAGE);
 218
 219         return hopinfo;
 220 }
 221
 222 static int xgene_enet_setup_tx_desc(struct xgene_enet_desc_ring *tx_ring,
 223                                     struct sk_buff *skb)
 224 {
 225         struct device *dev = ndev_to_dev(tx_ring->ndev);
 226         struct xgene_enet_raw_desc *raw_desc;
 227         dma_addr_t dma_addr;
 228         u16 tail = tx_ring->tail;
 229         u64 hopinfo;
 230
 231         raw_desc = &tx_ring->raw_desc[tail];
 232         memset(raw_desc, 0, sizeof(struct xgene_enet_raw_desc));
 233
 234         dma_addr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
 235         if (dma_mapping_error(dev, dma_addr)) {
 236                 netdev_err(tx_ring->ndev, "DMA mapping error\n");
 237                 return -EINVAL;
 238         }
 239
 240         /* Hardware expects descriptor in little endian format */
 241         raw_desc->m0 = cpu_to_le64(tail);
 242         raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
 243                                    SET_VAL(BUFDATALEN, skb->len) |
 244                                    SET_BIT(COHERENT));
 245         hopinfo = xgene_enet_work_msg(skb);
 246         raw_desc->m3 = cpu_to_le64(SET_VAL(HENQNUM, tx_ring->dst_ring_num) |
 247                                    hopinfo);
 248         tx_ring->cp_ring->cp_skb[tail] = skb;
 249
 250         return 0;
 251 }
 252
 253 static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
 254                                          struct net_device *ndev)
 255 {
 256         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 257         struct xgene_enet_desc_ring *tx_ring = pdata->tx_ring;
 258         struct xgene_enet_desc_ring *cp_ring = tx_ring->cp_ring;
 259         u32 tx_level, cq_level;
 260
 261         tx_level = pdata->ring_ops->len(tx_ring);
 262         cq_level = pdata->ring_ops->len(cp_ring);
 263         if (unlikely(tx_level > pdata->tx_qcnt_hi ||
 264                      cq_level > pdata->cp_qcnt_hi)) {
 265                 netif_stop_queue(ndev);
 266                 return NETDEV_TX_BUSY;
 267         }
 268
 269         if (xgene_enet_setup_tx_desc(tx_ring, skb)) {
 270                 dev_kfree_skb_any(skb);
 271                 return NETDEV_TX_OK;
 272         }
 273
 274         pdata->ring_ops->wr_cmd(tx_ring, 1);
 275         skb_tx_timestamp(skb);
 276         tx_ring->tail = (tx_ring->tail + 1) & (tx_ring->slots - 1);
 277
 278         pdata->stats.tx_packets++;
 279         pdata->stats.tx_bytes += skb->len;
 280
 281         return NETDEV_TX_OK;
 282 }
 283
 284 static void xgene_enet_skip_csum(struct sk_buff *skb)
 285 {
 286         struct iphdr *iph = ip_hdr(skb);
 287
 288         if (!ip_is_fragment(iph) ||
 289             (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP)) {
 290                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 291         }
 292 }
 293
 294 static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
 295                                struct xgene_enet_raw_desc *raw_desc)
 296 {
 297         struct net_device *ndev;
 298         struct xgene_enet_pdata *pdata;
 299         struct device *dev;
 300         struct xgene_enet_desc_ring *buf_pool;
 301         u32 datalen, skb_index;
 302         struct sk_buff *skb;
 303         u8 status;
 304         int ret = 0;
 305
 306         ndev = rx_ring->ndev;
 307         pdata = netdev_priv(ndev);
 308         dev = ndev_to_dev(rx_ring->ndev);
 309         buf_pool = rx_ring->buf_pool;
 310
 311         dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
 312                          XGENE_ENET_MAX_MTU, DMA_FROM_DEVICE);
 313         skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
 314         skb = buf_pool->rx_skb[skb_index];
 315
 316         /* checking for error */
 317         status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
 318         if (unlikely(status > 2)) {
 319                 dev_kfree_skb_any(skb);
 320                 xgene_enet_parse_error(rx_ring, netdev_priv(rx_ring->ndev),
 321                                        status);
 322                 pdata->stats.rx_dropped++;
 323                 ret = -EIO;
 324                 goto out;
 325         }
 326
 327         /* strip off CRC as HW isn't doing this */
 328         datalen = GET_VAL(BUFDATALEN, le64_to_cpu(raw_desc->m1));
 329         datalen -= 4;
 330         prefetch(skb->data - NET_IP_ALIGN);
 331         skb_put(skb, datalen);
 332
 333         skb_checksum_none_assert(skb);
 334         skb->protocol = eth_type_trans(skb, ndev);
 335         if (likely((ndev->features & NETIF_F_IP_CSUM) &&
 336                    skb->protocol == htons(ETH_P_IP))) {
 337                 xgene_enet_skip_csum(skb);
 338         }
 339
 340         pdata->stats.rx_packets++;
 341         pdata->stats.rx_bytes += datalen;
 342         napi_gro_receive(&rx_ring->napi, skb);
 343 out:
 344         if (--rx_ring->nbufpool == 0) {
 345                 ret = xgene_enet_refill_bufpool(buf_pool, NUM_BUFPOOL);
 346                 rx_ring->nbufpool = NUM_BUFPOOL;
 347         }
 348
 349         return ret;
 350 }
 351
 352 static bool is_rx_desc(struct xgene_enet_raw_desc *raw_desc)
 353 {
 354         return GET_VAL(FPQNUM, le64_to_cpu(raw_desc->m0)) ? true : false;
 355 }
 356
 357 static int xgene_enet_process_ring(struct xgene_enet_desc_ring *ring,
 358                                    int budget)
 359 {
 360         struct xgene_enet_pdata *pdata = netdev_priv(ring->ndev);
 361         struct xgene_enet_raw_desc *raw_desc;
 362         u16 head = ring->head;
 363         u16 slots = ring->slots - 1;
 364         int ret, count = 0;
 365
 366         do {
 367                 raw_desc = &ring->raw_desc[head];
 368                 if (unlikely(xgene_enet_is_desc_slot_empty(raw_desc)))
 369                         break;
 370
 371                 /* read fpqnum field after dataaddr field */
 372                 dma_rmb();
 373                 if (is_rx_desc(raw_desc))
 374                         ret = xgene_enet_rx_frame(ring, raw_desc);
 375                 else
 376                         ret = xgene_enet_tx_completion(ring, raw_desc);
 377                 xgene_enet_mark_desc_slot_empty(raw_desc);
 378
 379                 head = (head + 1) & slots;
 380                 count++;
 381
 382                 if (ret)
 383                         break;
 384         } while (--budget);
 385
 386         if (likely(count)) {
 387                 pdata->ring_ops->wr_cmd(ring, -count);
 388                 ring->head = head;
 389
 390                 if (netif_queue_stopped(ring->ndev)) {
 391                         if (pdata->ring_ops->len(ring) < pdata->cp_qcnt_low)
 392                                 netif_wake_queue(ring->ndev);
 393                 }
 394         }
 395
 396         return count;
 397 }
 398
 399 static int xgene_enet_napi(struct napi_struct *napi, const int budget)
 400 {
 401         struct xgene_enet_desc_ring *ring;
 402         int processed;
 403
 404         ring = container_of(napi, struct xgene_enet_desc_ring, napi);
 405         processed = xgene_enet_process_ring(ring, budget);
 406
 407         if (processed != budget) {
 408                 napi_complete(napi);
 409                 enable_irq(ring->irq);
 410         }
 411
 412         return processed;
 413 }
 414
 415 static void xgene_enet_timeout(struct net_device *ndev)
 416 {
 417         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 418
 419         pdata->mac_ops->reset(pdata);
 420 }
 421
 422 static int xgene_enet_register_irq(struct net_device *ndev)
 423 {
 424         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 425         struct device *dev = ndev_to_dev(ndev);
 426         struct xgene_enet_desc_ring *ring;
 427         int ret;
 428
 429         ring = pdata->rx_ring;
 430         ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq,
 431                                IRQF_SHARED, ring->irq_name, ring);
 432         if (ret)
 433                 netdev_err(ndev, "Failed to request irq %s\n", ring->irq_name);
 434
 435         if (pdata->cq_cnt) {
 436                 ring = pdata->tx_ring->cp_ring;
 437                 ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq,
 438                                        IRQF_SHARED, ring->irq_name, ring);
 439                 if (ret) {
 440                         netdev_err(ndev, "Failed to request irq %s\n",
 441                                    ring->irq_name);
 442                 }
 443         }
 444
 445         return ret;
 446 }
 447
 448 static void xgene_enet_free_irq(struct net_device *ndev)
 449 {
 450         struct xgene_enet_pdata *pdata;
 451         struct device *dev;
 452
 453         pdata = netdev_priv(ndev);
 454         dev = ndev_to_dev(ndev);
 455         devm_free_irq(dev, pdata->rx_ring->irq, pdata->rx_ring);
 456
 457         if (pdata->cq_cnt) {
 458                 devm_free_irq(dev, pdata->tx_ring->cp_ring->irq,
 459                               pdata->tx_ring->cp_ring);
 460         }
 461 }
 462
 463 static void xgene_enet_napi_enable(struct xgene_enet_pdata *pdata)
 464 {
 465         struct napi_struct *napi;
 466
 467         napi = &pdata->rx_ring->napi;
 468         napi_enable(napi);
 469
 470         if (pdata->cq_cnt) {
 471                 napi = &pdata->tx_ring->cp_ring->napi;
 472                 napi_enable(napi);
 473         }
 474 }
 475
 476 static void xgene_enet_napi_disable(struct xgene_enet_pdata *pdata)
 477 {
 478         struct napi_struct *napi;
 479
 480         napi = &pdata->rx_ring->napi;
 481         napi_disable(napi);
 482
 483         if (pdata->cq_cnt) {
 484                 napi = &pdata->tx_ring->cp_ring->napi;
 485                 napi_disable(napi);
 486         }
 487 }
 488
 489 static int xgene_enet_open(struct net_device *ndev)
 490 {
 491         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 492         struct xgene_mac_ops *mac_ops = pdata->mac_ops;
 493         int ret;
 494
 495         mac_ops->tx_enable(pdata);
 496         mac_ops->rx_enable(pdata);
 497
 498         ret = xgene_enet_register_irq(ndev);
 499         if (ret)
 500                 return ret;
 501         xgene_enet_napi_enable(pdata);
 502
 503         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
 504                 phy_start(pdata->phy_dev);
 505         else
 506                 schedule_delayed_work(&pdata->link_work, PHY_POLL_LINK_OFF);
 507
 508         netif_carrier_off(ndev);
 509         netif_start_queue(ndev);
 510
 511         return ret;
 512 }
 513
 514 static int xgene_enet_close(struct net_device *ndev)
 515 {
 516         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 517         struct xgene_mac_ops *mac_ops = pdata->mac_ops;
 518
 519         netif_stop_queue(ndev);
 520
 521         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
 522                 phy_stop(pdata->phy_dev);
 523         else
 524                 cancel_delayed_work_sync(&pdata->link_work);
 525
 526         xgene_enet_napi_disable(pdata);
 527         xgene_enet_free_irq(ndev);
 528         xgene_enet_process_ring(pdata->rx_ring, -1);
 529
 530         mac_ops->tx_disable(pdata);
 531         mac_ops->rx_disable(pdata);
 532
 533         return 0;
 534 }
 535
 536 static void xgene_enet_delete_ring(struct xgene_enet_desc_ring *ring)
 537 {
 538         struct xgene_enet_pdata *pdata;
 539         struct device *dev;
 540
 541         pdata = netdev_priv(ring->ndev);
 542         dev = ndev_to_dev(ring->ndev);
 543
 544         pdata->ring_ops->clear(ring);
 545         dma_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
 546 }
 547
 548 static void xgene_enet_delete_desc_rings(struct xgene_enet_pdata *pdata)
 549 {
 550         struct xgene_enet_desc_ring *buf_pool;
 551
 552         if (pdata->tx_ring) {
 553                 xgene_enet_delete_ring(pdata->tx_ring);
 554                 pdata->tx_ring = NULL;
 555         }
 556
 557         if (pdata->rx_ring) {
 558                 buf_pool = pdata->rx_ring->buf_pool;
 559                 xgene_enet_delete_bufpool(buf_pool);
 560                 xgene_enet_delete_ring(buf_pool);
 561                 xgene_enet_delete_ring(pdata->rx_ring);
 562                 pdata->rx_ring = NULL;
 563         }
 564 }
 565
 566 static int xgene_enet_get_ring_size(struct device *dev,
 567                                     enum xgene_enet_ring_cfgsize cfgsize)
 568 {
 569         int size = -EINVAL;
 570
 571         switch (cfgsize) {
 572         case RING_CFGSIZE_512B:
 573                 size = 0x200;
 574                 break;
 575         case RING_CFGSIZE_2KB:
 576                 size = 0x800;
 577                 break;
 578         case RING_CFGSIZE_16KB:
 579                 size = 0x4000;
 580                 break;
 581         case RING_CFGSIZE_64KB:
 582                 size = 0x10000;
 583                 break;
 584         case RING_CFGSIZE_512KB:
 585                 size = 0x80000;
 586                 break;
 587         default:
 588                 dev_err(dev, "Unsupported cfg ring size %d\n", cfgsize);
 589                 break;
 590         }
 591
 592         return size;
 593 }
 594
 595 static void xgene_enet_free_desc_ring(struct xgene_enet_desc_ring *ring)
 596 {
 597         struct xgene_enet_pdata *pdata;
 598         struct device *dev;
 599
 600         if (!ring)
 601                 return;
 602
 603         dev = ndev_to_dev(ring->ndev);
 604         pdata = netdev_priv(ring->ndev);
 605
 606         if (ring->desc_addr) {
 607                 pdata->ring_ops->clear(ring);
 608                 dma_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
 609         }
 610         devm_kfree(dev, ring);
 611 }
 612
 613 static void xgene_enet_free_desc_rings(struct xgene_enet_pdata *pdata)
 614 {
 615         struct device *dev = &pdata->pdev->dev;
 616         struct xgene_enet_desc_ring *ring;
 617
 618         ring = pdata->tx_ring;
 619         if (ring) {
 620                 if (ring->cp_ring && ring->cp_ring->cp_skb)
 621                         devm_kfree(dev, ring->cp_ring->cp_skb);
 622                 if (ring->cp_ring && pdata->cq_cnt)
 623                         xgene_enet_free_desc_ring(ring->cp_ring);
 624                 xgene_enet_free_desc_ring(ring);
 625         }
 626
 627         ring = pdata->rx_ring;
 628         if (ring) {
 629                 if (ring->buf_pool) {
 630                         if (ring->buf_pool->rx_skb)
 631                                 devm_kfree(dev, ring->buf_pool->rx_skb);
 632                         xgene_enet_free_desc_ring(ring->buf_pool);
 633                 }
 634                 xgene_enet_free_desc_ring(ring);
 635         }
 636 }
 637
 638 static bool is_irq_mbox_required(struct xgene_enet_pdata *pdata,
 639                                  struct xgene_enet_desc_ring *ring)
 640 {
 641         if ((pdata->enet_id == XGENE_ENET2) &&
 642             (xgene_enet_ring_owner(ring->id) == RING_OWNER_CPU)) {
 643                 return true;
 644         }
 645
 646         return false;
 647 }
 648
 649 static void __iomem *xgene_enet_ring_cmd_base(struct xgene_enet_pdata *pdata,
 650                                               struct xgene_enet_desc_ring *ring)
 651 {
 652         u8 num_ring_id_shift = pdata->ring_ops->num_ring_id_shift;
 653
 654         return pdata->ring_cmd_addr + (ring->num << num_ring_id_shift);
 655 }
 656
 657 static struct xgene_enet_desc_ring *xgene_enet_create_desc_ring(
 658                         struct net_device *ndev, u32 ring_num,
 659                         enum xgene_enet_ring_cfgsize cfgsize, u32 ring_id)
 660 {
 661         struct xgene_enet_desc_ring *ring;
 662         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 663         struct device *dev = ndev_to_dev(ndev);
 664         int size;
 665
 666         size = xgene_enet_get_ring_size(dev, cfgsize);
 667         if (size < 0)
 668                 return NULL;
 669
 670         ring = devm_kzalloc(dev, sizeof(struct xgene_enet_desc_ring),
 671                             GFP_KERNEL);
 672         if (!ring)
 673                 return NULL;
 674
 675         ring->ndev = ndev;
 676         ring->num = ring_num;
 677         ring->cfgsize = cfgsize;
 678         ring->id = ring_id;
 679
 680         ring->desc_addr = dma_zalloc_coherent(dev, size, &ring->dma,
 681                                               GFP_KERNEL);
 682         if (!ring->desc_addr) {
 683                 devm_kfree(dev, ring);
 684                 return NULL;
 685         }
 686         ring->size = size;
 687
 688         if (is_irq_mbox_required(pdata, ring)) {
 689                 ring->irq_mbox_addr = dma_zalloc_coherent(dev, INTR_MBOX_SIZE,
 690                                 &ring->irq_mbox_dma, GFP_KERNEL);
 691                 if (!ring->irq_mbox_addr) {
 692                         dma_free_coherent(dev, size, ring->desc_addr,
 693                                           ring->dma);
 694                         devm_kfree(dev, ring);
 695                         return NULL;
 696                 }
 697         }
 698
 699         ring->cmd_base = xgene_enet_ring_cmd_base(pdata, ring);
 700         ring->cmd = ring->cmd_base + INC_DEC_CMD_ADDR;
 701         ring = pdata->ring_ops->setup(ring);
 702         netdev_dbg(ndev, "ring info: num=%d  size=%d  id=%d  slots=%d\n",
 703                    ring->num, ring->size, ring->id, ring->slots);
 704
 705         return ring;
 706 }
 707
 708 static u16 xgene_enet_get_ring_id(enum xgene_ring_owner owner, u8 bufnum)
 709 {
 710         return (owner << 6) | (bufnum & GENMASK(5, 0));
 711 }
 712
 713 static enum xgene_ring_owner xgene_derive_ring_owner(struct xgene_enet_pdata *p)
 714 {
 715         enum xgene_ring_owner owner;
 716
 717         if (p->enet_id == XGENE_ENET1) {
 718                 switch (p->phy_mode) {
 719                 case PHY_INTERFACE_MODE_SGMII:
 720                         owner = RING_OWNER_ETH0;
 721                         break;
 722                 default:
 723                         owner = (!p->port_id) ? RING_OWNER_ETH0 :
 724                                                 RING_OWNER_ETH1;
 725                         break;
 726                 }
 727         } else {
 728                 owner = (!p->port_id) ? RING_OWNER_ETH0 : RING_OWNER_ETH1;
 729         }
 730
 731         return owner;
 732 }
 733
 734 static int xgene_enet_create_desc_rings(struct net_device *ndev)
 735 {
 736         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 737         struct device *dev = ndev_to_dev(ndev);
 738         struct xgene_enet_desc_ring *rx_ring, *tx_ring, *cp_ring;
 739         struct xgene_enet_desc_ring *buf_pool = NULL;
 740         enum xgene_ring_owner owner;
 741         u8 cpu_bufnum = pdata->cpu_bufnum;
 742         u8 eth_bufnum = pdata->eth_bufnum;
 743         u8 bp_bufnum = pdata->bp_bufnum;
 744         u16 ring_num = pdata->ring_num;
 745         u16 ring_id;
 746         int ret;
 747
 748         /* allocate rx descriptor ring */
 749         owner = xgene_derive_ring_owner(pdata);
 750         ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, cpu_bufnum++);
 751         rx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
 752                                               RING_CFGSIZE_16KB, ring_id);
 753         if (!rx_ring) {
 754                 ret = -ENOMEM;
 755                 goto err;
 756         }
 757
 758         /* allocate buffer pool for receiving packets */
 759         owner = xgene_derive_ring_owner(pdata);
 760         ring_id = xgene_enet_get_ring_id(owner, bp_bufnum++);
 761         buf_pool = xgene_enet_create_desc_ring(ndev, ring_num++,
 762                                                RING_CFGSIZE_2KB, ring_id);
 763         if (!buf_pool) {
 764                 ret = -ENOMEM;
 765                 goto err;
 766         }
 767
 768         rx_ring->nbufpool = NUM_BUFPOOL;
 769         rx_ring->buf_pool = buf_pool;
 770         rx_ring->irq = pdata->rx_irq;
 771         if (!pdata->cq_cnt) {
 772                 snprintf(rx_ring->irq_name, IRQ_ID_SIZE, "%s-rx-txc",
 773                          ndev->name);
 774         } else {
 775                 snprintf(rx_ring->irq_name, IRQ_ID_SIZE, "%s-rx", ndev->name);
 776         }
 777         buf_pool->rx_skb = devm_kcalloc(dev, buf_pool->slots,
 778                                         sizeof(struct sk_buff *), GFP_KERNEL);
 779         if (!buf_pool->rx_skb) {
 780                 ret = -ENOMEM;
 781                 goto err;
 782         }
 783
 784         buf_pool->dst_ring_num = xgene_enet_dst_ring_num(buf_pool);
 785         rx_ring->buf_pool = buf_pool;
 786         pdata->rx_ring = rx_ring;
 787
 788         /* allocate tx descriptor ring */
 789         owner = xgene_derive_ring_owner(pdata);
 790         ring_id = xgene_enet_get_ring_id(owner, eth_bufnum++);
 791         tx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
 792                                               RING_CFGSIZE_16KB, ring_id);
 793         if (!tx_ring) {
 794                 ret = -ENOMEM;
 795                 goto err;
 796         }
 797         pdata->tx_ring = tx_ring;
 798
 799         if (!pdata->cq_cnt) {
 800                 cp_ring = pdata->rx_ring;
 801         } else {
 802                 /* allocate tx completion descriptor ring */
 803                 ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, cpu_bufnum++);
 804                 cp_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
 805                                                       RING_CFGSIZE_16KB,
 806                                                       ring_id);
 807                 if (!cp_ring) {
 808                         ret = -ENOMEM;
 809                         goto err;
 810                 }
 811                 cp_ring->irq = pdata->txc_irq;
 812                 snprintf(cp_ring->irq_name, IRQ_ID_SIZE, "%s-txc", ndev->name);
 813         }
 814
 815         cp_ring->cp_skb = devm_kcalloc(dev, tx_ring->slots,
 816                                        sizeof(struct sk_buff *), GFP_KERNEL);
 817         if (!cp_ring->cp_skb) {
 818                 ret = -ENOMEM;
 819                 goto err;
 820         }
 821         pdata->tx_ring->cp_ring = cp_ring;
 822         pdata->tx_ring->dst_ring_num = xgene_enet_dst_ring_num(cp_ring);
 823
 824         pdata->tx_qcnt_hi = pdata->tx_ring->slots / 2;
 825         pdata->cp_qcnt_hi = pdata->rx_ring->slots / 2;
 826         pdata->cp_qcnt_low = pdata->cp_qcnt_hi / 2;
 827
 828         return 0;
 829
 830 err:
 831         xgene_enet_free_desc_rings(pdata);
 832         return ret;
 833 }
 834
 835 static struct rtnl_link_stats64 *xgene_enet_get_stats64(
 836                         struct net_device *ndev,
 837                         struct rtnl_link_stats64 *storage)
 838 {
 839         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 840         struct rtnl_link_stats64 *stats = &pdata->stats;
 841
 842         stats->rx_errors += stats->rx_length_errors +
 843                             stats->rx_crc_errors +
 844                             stats->rx_frame_errors +
 845                             stats->rx_fifo_errors;
 846         memcpy(storage, &pdata->stats, sizeof(struct rtnl_link_stats64));
 847
 848         return storage;
 849 }
 850
 851 static int xgene_enet_set_mac_address(struct net_device *ndev, void *addr)
 852 {
 853         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 854         int ret;
 855
 856         ret = eth_mac_addr(ndev, addr);
 857         if (ret)
 858                 return ret;
 859         pdata->mac_ops->set_mac_addr(pdata);
 860
 861         return ret;
 862 }
 863
 864 static const struct net_device_ops xgene_ndev_ops = {
 865         .ndo_open = xgene_enet_open,
 866         .ndo_stop = xgene_enet_close,
 867         .ndo_start_xmit = xgene_enet_start_xmit,
 868         .ndo_tx_timeout = xgene_enet_timeout,
 869         .ndo_get_stats64 = xgene_enet_get_stats64,
 870         .ndo_change_mtu = eth_change_mtu,
 871         .ndo_set_mac_address = xgene_enet_set_mac_address,
 872 };
 873
 874 #ifdef CONFIG_ACPI
 875 static int xgene_get_port_id_acpi(struct device *dev,
 876                                   struct xgene_enet_pdata *pdata)
 877 {
 878         acpi_status status;
 879         u64 temp;
 880
 881         status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_SUN", NULL, &temp);
 882         if (ACPI_FAILURE(status)) {
 883                 pdata->port_id = 0;
 884         } else {
 885                 pdata->port_id = temp;
 886         }
 887
 888         return 0;
 889 }
 890 #endif
 891
 892 static int xgene_get_port_id_dt(struct device *dev, struct xgene_enet_pdata *pdata)
 893 {
 894         u32 id = 0;
 895         int ret;
 896
 897         ret = of_property_read_u32(dev->of_node, "port-id", &id);
 898         if (ret) {
 899                 pdata->port_id = 0;
 900                 ret = 0;
 901         } else {
 902                 pdata->port_id = id & BIT(0);
 903         }
 904
 905         return ret;
 906 }
 907
 908 static int xgene_get_mac_address(struct device *dev,
 909                                  unsigned char *addr)
 910 {
 911         int ret;
 912
 913         ret = device_property_read_u8_array(dev, "local-mac-address", addr, 6);
 914         if (ret)
 915                 ret = device_property_read_u8_array(dev, "mac-address",
 916                                                     addr, 6);
 917         if (ret)
 918                 return -ENODEV;
 919
 920         return ETH_ALEN;
 921 }
 922
 923 static int xgene_get_phy_mode(struct device *dev)
 924 {
 925         int i, ret;
 926         char *modestr;
 927
 928         ret = device_property_read_string(dev, "phy-connection-type",
 929                                           (const char **)&modestr);
 930         if (ret)
 931                 ret = device_property_read_string(dev, "phy-mode",
 932                                                   (const char **)&modestr);
 933         if (ret)
 934                 return -ENODEV;
 935
 936         for (i = 0; i < PHY_INTERFACE_MODE_MAX; i++) {
 937                 if (!strcasecmp(modestr, phy_modes(i)))
 938                         return i;
 939         }
 940         return -ENODEV;
 941 }
 942
 943 static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
 944 {
 945         struct platform_device *pdev;
 946         struct net_device *ndev;
 947         struct device *dev;
 948         struct resource *res;
 949         void __iomem *base_addr;
 950         u32 offset;
 951         int ret;
 952
 953         pdev = pdata->pdev;
 954         dev = &pdev->dev;
 955         ndev = pdata->ndev;
 956
 957         res = platform_get_resource(pdev, IORESOURCE_MEM, RES_ENET_CSR);
 958         if (!res) {
 959                 dev_err(dev, "Resource enet_csr not defined\n");
 960                 return -ENODEV;
 961         }
 962         pdata->base_addr = devm_ioremap(dev, res->start, resource_size(res));
 963         if (!pdata->base_addr) {
 964                 dev_err(dev, "Unable to retrieve ENET Port CSR region\n");
 965                 return -ENOMEM;
 966         }
 967
 968         res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CSR);
 969         if (!res) {
 970                 dev_err(dev, "Resource ring_csr not defined\n");
 971                 return -ENODEV;
 972         }
 973         pdata->ring_csr_addr = devm_ioremap(dev, res->start,
 974                                                         resource_size(res));
 975         if (!pdata->ring_csr_addr) {
 976                 dev_err(dev, "Unable to retrieve ENET Ring CSR region\n");
 977                 return -ENOMEM;
 978         }
 979
 980         res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CMD);
 981         if (!res) {
 982                 dev_err(dev, "Resource ring_cmd not defined\n");
 983                 return -ENODEV;
 984         }
 985         pdata->ring_cmd_addr = devm_ioremap(dev, res->start,
 986                                                         resource_size(res));
 987         if (!pdata->ring_cmd_addr) {
 988                 dev_err(dev, "Unable to retrieve ENET Ring command region\n");
 989                 return -ENOMEM;
 990         }
 991
 992         if (dev->of_node)
 993                 ret = xgene_get_port_id_dt(dev, pdata);
 994 #ifdef CONFIG_ACPI
 995         else
 996                 ret = xgene_get_port_id_acpi(dev, pdata);
 997 #endif
 998         if (ret)
 999                 return ret;
1000
1001         if (xgene_get_mac_address(dev, ndev->dev_addr) != ETH_ALEN)
1002                 eth_hw_addr_random(ndev);
1003
1004         memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len);
1005
1006         pdata->phy_mode = xgene_get_phy_mode(dev);
1007         if (pdata->phy_mode < 0) {
1008                 dev_err(dev, "Unable to get phy-connection-type\n");
1009                 return pdata->phy_mode;
1010         }
1011         if (pdata->phy_mode != PHY_INTERFACE_MODE_RGMII &&
1012             pdata->phy_mode != PHY_INTERFACE_MODE_SGMII &&
1013             pdata->phy_mode != PHY_INTERFACE_MODE_XGMII) {
1014                 dev_err(dev, "Incorrect phy-connection-type specified\n");
1015                 return -ENODEV;
1016         }
1017
1018         ret = platform_get_irq(pdev, 0);
1019         if (ret <= 0) {
1020                 dev_err(dev, "Unable to get ENET Rx IRQ\n");
1021                 ret = ret ? : -ENXIO;
1022                 return ret;
1023         }
1024         pdata->rx_irq = ret;
1025
1026         if (pdata->phy_mode != PHY_INTERFACE_MODE_RGMII) {
1027                 ret = platform_get_irq(pdev, 1);
1028                 if (ret <= 0) {
1029                         pdata->cq_cnt = 0;
1030                         dev_info(dev, "Unable to get Tx completion IRQ,"
1031                                  "using Rx IRQ instead\n");
1032                 } else {
1033                         pdata->cq_cnt = XGENE_MAX_TXC_RINGS;
1034                         pdata->txc_irq = ret;
1035                 }
1036         }
1037
1038         pdata->clk = devm_clk_get(&pdev->dev, NULL);
1039         if (IS_ERR(pdata->clk)) {
1040                 /* Firmware may have set up the clock already. */
1041                 dev_info(dev, "clocks have been setup already\n");
1042         }
1043
1044         if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII)
1045                 base_addr = pdata->base_addr - (pdata->port_id * MAC_OFFSET);
1046         else
1047                 base_addr = pdata->base_addr;
1048         pdata->eth_csr_addr = base_addr + BLOCK_ETH_CSR_OFFSET;
1049         pdata->eth_ring_if_addr = base_addr + BLOCK_ETH_RING_IF_OFFSET;
1050         pdata->eth_diag_csr_addr = base_addr + BLOCK_ETH_DIAG_CSR_OFFSET;
1051         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII ||
1052             pdata->phy_mode == PHY_INTERFACE_MODE_SGMII) {
1053                 pdata->mcx_mac_addr = pdata->base_addr + BLOCK_ETH_MAC_OFFSET;
1054                 offset = (pdata->enet_id == XGENE_ENET1) ?
1055                           BLOCK_ETH_MAC_CSR_OFFSET :
1056                           X2_BLOCK_ETH_MAC_CSR_OFFSET;
1057                 pdata->mcx_mac_csr_addr = base_addr + offset;
1058         } else {
1059                 pdata->mcx_mac_addr = base_addr + BLOCK_AXG_MAC_OFFSET;
1060                 pdata->mcx_mac_csr_addr = base_addr + BLOCK_AXG_MAC_CSR_OFFSET;
1061         }
1062         pdata->rx_buff_cnt = NUM_PKT_BUF;
1063
1064         return 0;
1065 }
1066
1067 static int xgene_enet_init_hw(struct xgene_enet_pdata *pdata)
1068 {
1069         struct net_device *ndev = pdata->ndev;
1070         struct xgene_enet_desc_ring *buf_pool;
1071         u16 dst_ring_num;
1072         int ret;
1073
1074         ret = pdata->port_ops->reset(pdata);
1075         if (ret)
1076                 return ret;
1077
1078         ret = xgene_enet_create_desc_rings(ndev);
1079         if (ret) {
1080                 netdev_err(ndev, "Error in ring configuration\n");
1081                 return ret;
1082         }
1083
1084         /* setup buffer pool */
1085         buf_pool = pdata->rx_ring->buf_pool;
1086         xgene_enet_init_bufpool(buf_pool);
1087         ret = xgene_enet_refill_bufpool(buf_pool, pdata->rx_buff_cnt);
1088         if (ret) {
1089                 xgene_enet_delete_desc_rings(pdata);
1090                 return ret;
1091         }
1092
1093         dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring);
1094         pdata->port_ops->cle_bypass(pdata, dst_ring_num, buf_pool->id);
1095         pdata->mac_ops->init(pdata);
1096
1097         return ret;
1098 }
1099
1100 static void xgene_enet_setup_ops(struct xgene_enet_pdata *pdata)
1101 {
1102         switch (pdata->phy_mode) {
1103         case PHY_INTERFACE_MODE_RGMII:
1104                 pdata->mac_ops = &xgene_gmac_ops;
1105                 pdata->port_ops = &xgene_gport_ops;
1106                 pdata->rm = RM3;
1107                 break;
1108         case PHY_INTERFACE_MODE_SGMII:
1109                 pdata->mac_ops = &xgene_sgmac_ops;
1110                 pdata->port_ops = &xgene_sgport_ops;
1111                 pdata->rm = RM1;
1112                 break;
1113         default:
1114                 pdata->mac_ops = &xgene_xgmac_ops;
1115                 pdata->port_ops = &xgene_xgport_ops;
1116                 pdata->rm = RM0;
1117                 break;
1118         }
1119
1120         if (pdata->enet_id == XGENE_ENET1) {
1121                 switch (pdata->port_id) {
1122                 case 0:
1123                         pdata->cpu_bufnum = START_CPU_BUFNUM_0;
1124                         pdata->eth_bufnum = START_ETH_BUFNUM_0;
1125                         pdata->bp_bufnum = START_BP_BUFNUM_0;
1126                         pdata->ring_num = START_RING_NUM_0;
1127                         break;
1128                 case 1:
1129                         pdata->cpu_bufnum = START_CPU_BUFNUM_1;
1130                         pdata->eth_bufnum = START_ETH_BUFNUM_1;
1131                         pdata->bp_bufnum = START_BP_BUFNUM_1;
1132                         pdata->ring_num = START_RING_NUM_1;
1133                         break;
1134                 default:
1135                         break;
1136                 }
1137                 pdata->ring_ops = &xgene_ring1_ops;
1138         } else {
1139                 switch (pdata->port_id) {
1140                 case 0:
1141                         pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0;
1142                         pdata->eth_bufnum = X2_START_ETH_BUFNUM_0;
1143                         pdata->bp_bufnum = X2_START_BP_BUFNUM_0;
1144                         pdata->ring_num = X2_START_RING_NUM_0;
1145                         break;
1146                 case 1:
1147                         pdata->cpu_bufnum = X2_START_CPU_BUFNUM_1;
1148                         pdata->eth_bufnum = X2_START_ETH_BUFNUM_1;
1149                         pdata->bp_bufnum = X2_START_BP_BUFNUM_1;
1150                         pdata->ring_num = X2_START_RING_NUM_1;
1151                         break;
1152                 default:
1153                         break;
1154                 }
1155                 pdata->rm = RM0;
1156                 pdata->ring_ops = &xgene_ring2_ops;
1157         }
1158 }
1159
1160 static void xgene_enet_napi_add(struct xgene_enet_pdata *pdata)
1161 {
1162         struct napi_struct *napi;
1163
1164         napi = &pdata->rx_ring->napi;
1165         netif_napi_add(pdata->ndev, napi, xgene_enet_napi, NAPI_POLL_WEIGHT);
1166
1167         if (pdata->cq_cnt) {
1168                 napi = &pdata->tx_ring->cp_ring->napi;
1169                 netif_napi_add(pdata->ndev, napi, xgene_enet_napi,
1170                                NAPI_POLL_WEIGHT);
1171         }
1172 }
1173
1174 static void xgene_enet_napi_del(struct xgene_enet_pdata *pdata)
1175 {
1176         struct napi_struct *napi;
1177
1178         napi = &pdata->rx_ring->napi;
1179         netif_napi_del(napi);
1180
1181         if (pdata->cq_cnt) {
1182                 napi = &pdata->tx_ring->cp_ring->napi;
1183                 netif_napi_del(napi);
1184         }
1185 }
1186
1187 static int xgene_enet_probe(struct platform_device *pdev)
1188 {
1189         struct net_device *ndev;
1190         struct xgene_enet_pdata *pdata;
1191         struct device *dev = &pdev->dev;
1192         struct xgene_mac_ops *mac_ops;
1193         const struct of_device_id *of_id;
1194         int ret;
1195
1196         ndev = alloc_etherdev(sizeof(struct xgene_enet_pdata));
1197         if (!ndev)
1198                 return -ENOMEM;
1199
1200         pdata = netdev_priv(ndev);
1201
1202         pdata->pdev = pdev;
1203         pdata->ndev = ndev;
1204         SET_NETDEV_DEV(ndev, dev);
1205         platform_set_drvdata(pdev, pdata);
1206         ndev->netdev_ops = &xgene_ndev_ops;
1207         xgene_enet_set_ethtool_ops(ndev);
1208         ndev->features |= NETIF_F_IP_CSUM |
1209                           NETIF_F_GSO |
1210                           NETIF_F_GRO;
1211
1212         of_id = of_match_device(xgene_enet_of_match, &pdev->dev);
1213         if (of_id) {
1214                 pdata->enet_id = (enum xgene_enet_id)of_id->data;
1215         }
1216 #ifdef CONFIG_ACPI
1217         else {
1218                 const struct acpi_device_id *acpi_id;
1219
1220                 acpi_id = acpi_match_device(xgene_enet_acpi_match, &pdev->dev);
1221                 if (acpi_id)
1222                         pdata->enet_id = (enum xgene_enet_id) acpi_id->driver_data;
1223         }
1224 #endif
1225         if (!pdata->enet_id) {
1226                 free_netdev(ndev);
1227                 return -ENODEV;
1228         }
1229
1230         ret = xgene_enet_get_resources(pdata);
1231         if (ret)
1232                 goto err;
1233
1234         xgene_enet_setup_ops(pdata);
1235
1236         ret = register_netdev(ndev);
1237         if (ret) {
1238                 netdev_err(ndev, "Failed to register netdev\n");
1239                 goto err;
1240         }
1241
1242         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
1243         if (ret) {
1244                 netdev_err(ndev, "No usable DMA configuration\n");
1245                 goto err;
1246         }
1247
1248         ret = xgene_enet_init_hw(pdata);
1249         if (ret)
1250                 goto err;
1251
1252         xgene_enet_napi_add(pdata);
1253         mac_ops = pdata->mac_ops;
1254         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
1255                 ret = xgene_enet_mdio_config(pdata);
1256         else
1257                 INIT_DELAYED_WORK(&pdata->link_work, mac_ops->link_state);
1258
1259         return ret;
1260 err:
1261         unregister_netdev(ndev);
1262         free_netdev(ndev);
1263         return ret;
1264 }
1265
1266 static int xgene_enet_remove(struct platform_device *pdev)
1267 {
1268         struct xgene_enet_pdata *pdata;
1269         struct xgene_mac_ops *mac_ops;
1270         struct net_device *ndev;
1271
1272         pdata = platform_get_drvdata(pdev);
1273         mac_ops = pdata->mac_ops;
1274         ndev = pdata->ndev;
1275
1276         mac_ops->rx_disable(pdata);
1277         mac_ops->tx_disable(pdata);
1278
1279         xgene_enet_napi_del(pdata);
1280         xgene_enet_mdio_remove(pdata);
1281         xgene_enet_delete_desc_rings(pdata);
1282         unregister_netdev(ndev);
1283         pdata->port_ops->shutdown(pdata);
1284         free_netdev(ndev);
1285
1286         return 0;
1287 }
1288
1289 #ifdef CONFIG_ACPI
1290 static const struct acpi_device_id xgene_enet_acpi_match[] = {
1291         { "APMC0D05", XGENE_ENET1},
1292         { "APMC0D30", XGENE_ENET1},
1293         { "APMC0D31", XGENE_ENET1},
1294         { "APMC0D26", XGENE_ENET2},
1295         { "APMC0D25", XGENE_ENET2},
1296         { }
1297 };
1298 MODULE_DEVICE_TABLE(acpi, xgene_enet_acpi_match);
1299 #endif
1300
1301 #ifdef CONFIG_OF
1302 static const struct of_device_id xgene_enet_of_match[] = {
1303         {.compatible = "apm,xgene-enet",    .data = (void *)XGENE_ENET1},
1304         {.compatible = "apm,xgene1-sgenet", .data = (void *)XGENE_ENET1},
1305         {.compatible = "apm,xgene1-xgenet", .data = (void *)XGENE_ENET1},
1306         {.compatible = "apm,xgene2-sgenet", .data = (void *)XGENE_ENET2},
1307         {.compatible = "apm,xgene2-xgenet", .data = (void *)XGENE_ENET2},
1308         {},
1309 };
1310
1311 MODULE_DEVICE_TABLE(of, xgene_enet_of_match);
1312 #endif
1313
1314 static struct platform_driver xgene_enet_driver = {
1315         .driver = {
1316                    .name = "xgene-enet",
1317                    .of_match_table = of_match_ptr(xgene_enet_of_match),
1318                    .acpi_match_table = ACPI_PTR(xgene_enet_acpi_match),
1319         },
1320         .probe = xgene_enet_probe,
1321         .remove = xgene_enet_remove,
1322 };
1323
1324 module_platform_driver(xgene_enet_driver);
1325
1326 MODULE_DESCRIPTION("APM X-Gene SoC Ethernet driver");
1327 MODULE_VERSION(XGENE_DRV_VERSION);
1328 MODULE_AUTHOR("Iyappan Subramanian <isubramanian@apm.com>");
1329 MODULE_AUTHOR("Keyur Chudgar <kchudgar@apm.com>");
1330 MODULE_LICENSE("GPL");