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 u8 xgene_enet_hdr_len(const void *data)
  97 {
  98         const struct ethhdr *eth = data;
  99
 100         return (eth->h_proto == htons(ETH_P_8021Q)) ? VLAN_ETH_HLEN : ETH_HLEN;
 101 }
 102
 103 static void xgene_enet_delete_bufpool(struct xgene_enet_desc_ring *buf_pool)
 104 {
 105         struct xgene_enet_pdata *pdata = netdev_priv(buf_pool->ndev);
 106         struct xgene_enet_raw_desc16 *raw_desc;
 107         u32 slots = buf_pool->slots - 1;
 108         u32 tail = buf_pool->tail;
 109         u32 userinfo;
 110         int i, len;
 111
 112         len = pdata->ring_ops->len(buf_pool);
 113         for (i = 0; i < len; i++) {
 114                 tail = (tail - 1) & slots;
 115                 raw_desc = &buf_pool->raw_desc16[tail];
 116
 117                 /* Hardware stores descriptor in little endian format */
 118                 userinfo = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
 119                 dev_kfree_skb_any(buf_pool->rx_skb[userinfo]);
 120         }
 121
 122         pdata->ring_ops->wr_cmd(buf_pool, -len);
 123         buf_pool->tail = tail;
 124 }
 125
 126 static irqreturn_t xgene_enet_rx_irq(const int irq, void *data)
 127 {
 128         struct xgene_enet_desc_ring *rx_ring = data;
 129
 130         if (napi_schedule_prep(&rx_ring->napi)) {
 131                 disable_irq_nosync(irq);
 132                 __napi_schedule(&rx_ring->napi);
 133         }
 134
 135         return IRQ_HANDLED;
 136 }
 137
 138 static int xgene_enet_tx_completion(struct xgene_enet_desc_ring *cp_ring,
 139                                     struct xgene_enet_raw_desc *raw_desc)
 140 {
 141         struct sk_buff *skb;
 142         struct device *dev;
 143         skb_frag_t *frag;
 144         dma_addr_t *frag_dma_addr;
 145         u16 skb_index;
 146         u8 status;
 147         int i, ret = 0;
 148
 149         skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
 150         skb = cp_ring->cp_skb[skb_index];
 151         frag_dma_addr = &cp_ring->frag_dma_addr[skb_index * MAX_SKB_FRAGS];
 152
 153         dev = ndev_to_dev(cp_ring->ndev);
 154         dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
 155                          skb_headlen(skb),
 156                          DMA_TO_DEVICE);
 157
 158         for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
 159                 frag = &skb_shinfo(skb)->frags[i];
 160                 dma_unmap_page(dev, frag_dma_addr[i], skb_frag_size(frag),
 161                                DMA_TO_DEVICE);
 162         }
 163
 164         /* Checking for error */
 165         status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
 166         if (unlikely(status > 2)) {
 167                 xgene_enet_parse_error(cp_ring, netdev_priv(cp_ring->ndev),
 168                                        status);
 169                 ret = -EIO;
 170         }
 171
 172         if (likely(skb)) {
 173                 dev_kfree_skb_any(skb);
 174         } else {
 175                 netdev_err(cp_ring->ndev, "completion skb is NULL\n");
 176                 ret = -EIO;
 177         }
 178
 179         return ret;
 180 }
 181
 182 static u64 xgene_enet_work_msg(struct sk_buff *skb)
 183 {
 184         struct net_device *ndev = skb->dev;
 185         struct iphdr *iph;
 186         u8 l3hlen = 0, l4hlen = 0;
 187         u8 ethhdr, proto = 0, csum_enable = 0;
 188         u64 hopinfo = 0;
 189         u32 hdr_len, mss = 0;
 190         u32 i, len, nr_frags;
 191
 192         ethhdr = xgene_enet_hdr_len(skb->data);
 193
 194         if (unlikely(skb->protocol != htons(ETH_P_IP)) &&
 195             unlikely(skb->protocol != htons(ETH_P_8021Q)))
 196                 goto out;
 197
 198         if (unlikely(!(skb->dev->features & NETIF_F_IP_CSUM)))
 199                 goto out;
 200
 201         iph = ip_hdr(skb);
 202         if (unlikely(ip_is_fragment(iph)))
 203                 goto out;
 204
 205         if (likely(iph->protocol == IPPROTO_TCP)) {
 206                 l4hlen = tcp_hdrlen(skb) >> 2;
 207                 csum_enable = 1;
 208                 proto = TSO_IPPROTO_TCP;
 209                 if (ndev->features & NETIF_F_TSO) {
 210                         hdr_len = ethhdr + ip_hdrlen(skb) + tcp_hdrlen(skb);
 211                         mss = skb_shinfo(skb)->gso_size;
 212
 213                         if (skb_is_nonlinear(skb)) {
 214                                 len = skb_headlen(skb);
 215                                 nr_frags = skb_shinfo(skb)->nr_frags;
 216
 217                                 for (i = 0; i < 2 && i < nr_frags; i++)
 218                                         len += skb_shinfo(skb)->frags[i].size;
 219
 220                                 /* HW requires header must reside in 3 buffer */
 221                                 if (unlikely(hdr_len > len)) {
 222                                         if (skb_linearize(skb))
 223                                                 return 0;
 224                                 }
 225                         }
 226
 227                         if (!mss || ((skb->len - hdr_len) <= mss))
 228                                 goto out;
 229
 230                         hopinfo |= SET_BIT(ET);
 231                 }
 232         } else if (iph->protocol == IPPROTO_UDP) {
 233                 l4hlen = UDP_HDR_SIZE;
 234                 csum_enable = 1;
 235         }
 236 out:
 237         l3hlen = ip_hdrlen(skb) >> 2;
 238         hopinfo |= SET_VAL(TCPHDR, l4hlen) |
 239                   SET_VAL(IPHDR, l3hlen) |
 240                   SET_VAL(ETHHDR, ethhdr) |
 241                   SET_VAL(EC, csum_enable) |
 242                   SET_VAL(IS, proto) |
 243                   SET_BIT(IC) |
 244                   SET_BIT(TYPE_ETH_WORK_MESSAGE);
 245
 246         return hopinfo;
 247 }
 248
 249 static u16 xgene_enet_encode_len(u16 len)
 250 {
 251         return (len == BUFLEN_16K) ? 0 : len;
 252 }
 253
 254 static void xgene_set_addr_len(__le64 *desc, u32 idx, dma_addr_t addr, u32 len)
 255 {
 256         desc[idx ^ 1] = cpu_to_le64(SET_VAL(DATAADDR, addr) |
 257                                     SET_VAL(BUFDATALEN, len));
 258 }
 259
 260 static __le64 *xgene_enet_get_exp_bufs(struct xgene_enet_desc_ring *ring)
 261 {
 262         __le64 *exp_bufs;
 263
 264         exp_bufs = &ring->exp_bufs[ring->exp_buf_tail * MAX_EXP_BUFFS];
 265         memset(exp_bufs, 0, sizeof(__le64) * MAX_EXP_BUFFS);
 266         ring->exp_buf_tail = (ring->exp_buf_tail + 1) & ((ring->slots / 2) - 1);
 267
 268         return exp_bufs;
 269 }
 270
 271 static dma_addr_t *xgene_get_frag_dma_array(struct xgene_enet_desc_ring *ring)
 272 {
 273         return &ring->cp_ring->frag_dma_addr[ring->tail * MAX_SKB_FRAGS];
 274 }
 275
 276 static int xgene_enet_setup_tx_desc(struct xgene_enet_desc_ring *tx_ring,
 277                                     struct sk_buff *skb)
 278 {
 279         struct device *dev = ndev_to_dev(tx_ring->ndev);
 280         struct xgene_enet_pdata *pdata = netdev_priv(tx_ring->ndev);
 281         struct xgene_enet_raw_desc *raw_desc;
 282         __le64 *exp_desc = NULL, *exp_bufs = NULL;
 283         dma_addr_t dma_addr, pbuf_addr, *frag_dma_addr;
 284         skb_frag_t *frag;
 285         u16 tail = tx_ring->tail;
 286         u64 hopinfo;
 287         u32 len, hw_len;
 288         u8 ll = 0, nv = 0, idx = 0;
 289         bool split = false;
 290         u32 size, offset, ell_bytes = 0;
 291         u32 i, fidx, nr_frags, count = 1;
 292
 293         raw_desc = &tx_ring->raw_desc[tail];
 294         tail = (tail + 1) & (tx_ring->slots - 1);
 295         memset(raw_desc, 0, sizeof(struct xgene_enet_raw_desc));
 296
 297         hopinfo = xgene_enet_work_msg(skb);
 298         if (!hopinfo)
 299                 return -EINVAL;
 300         raw_desc->m3 = cpu_to_le64(SET_VAL(HENQNUM, tx_ring->dst_ring_num) |
 301                                    hopinfo);
 302
 303         len = skb_headlen(skb);
 304         hw_len = xgene_enet_encode_len(len);
 305
 306         dma_addr = dma_map_single(dev, skb->data, len, DMA_TO_DEVICE);
 307         if (dma_mapping_error(dev, dma_addr)) {
 308                 netdev_err(tx_ring->ndev, "DMA mapping error\n");
 309                 return -EINVAL;
 310         }
 311
 312         /* Hardware expects descriptor in little endian format */
 313         raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
 314                                    SET_VAL(BUFDATALEN, hw_len) |
 315                                    SET_BIT(COHERENT));
 316
 317         if (!skb_is_nonlinear(skb))
 318                 goto out;
 319
 320         /* scatter gather */
 321         nv = 1;
 322         exp_desc = (void *)&tx_ring->raw_desc[tail];
 323         tail = (tail + 1) & (tx_ring->slots - 1);
 324         memset(exp_desc, 0, sizeof(struct xgene_enet_raw_desc));
 325
 326         nr_frags = skb_shinfo(skb)->nr_frags;
 327         for (i = nr_frags; i < 4 ; i++)
 328                 exp_desc[i ^ 1] = cpu_to_le64(LAST_BUFFER);
 329
 330         frag_dma_addr = xgene_get_frag_dma_array(tx_ring);
 331
 332         for (i = 0, fidx = 0; split || (fidx < nr_frags); i++) {
 333                 if (!split) {
 334                         frag = &skb_shinfo(skb)->frags[fidx];
 335                         size = skb_frag_size(frag);
 336                         offset = 0;
 337
 338                         pbuf_addr = skb_frag_dma_map(dev, frag, 0, size,
 339                                                      DMA_TO_DEVICE);
 340                         if (dma_mapping_error(dev, pbuf_addr))
 341                                 return -EINVAL;
 342
 343                         frag_dma_addr[fidx] = pbuf_addr;
 344                         fidx++;
 345
 346                         if (size > BUFLEN_16K)
 347                                 split = true;
 348                 }
 349
 350                 if (size > BUFLEN_16K) {
 351                         len = BUFLEN_16K;
 352                         size -= BUFLEN_16K;
 353                 } else {
 354                         len = size;
 355                         split = false;
 356                 }
 357
 358                 dma_addr = pbuf_addr + offset;
 359                 hw_len = xgene_enet_encode_len(len);
 360
 361                 switch (i) {
 362                 case 0:
 363                 case 1:
 364                 case 2:
 365                         xgene_set_addr_len(exp_desc, i, dma_addr, hw_len);
 366                         break;
 367                 case 3:
 368                         if (split || (fidx != nr_frags)) {
 369                                 exp_bufs = xgene_enet_get_exp_bufs(tx_ring);
 370                                 xgene_set_addr_len(exp_bufs, idx, dma_addr,
 371                                                    hw_len);
 372                                 idx++;
 373                                 ell_bytes += len;
 374                         } else {
 375                                 xgene_set_addr_len(exp_desc, i, dma_addr,
 376                                                    hw_len);
 377                         }
 378                         break;
 379                 default:
 380                         xgene_set_addr_len(exp_bufs, idx, dma_addr, hw_len);
 381                         idx++;
 382                         ell_bytes += len;
 383                         break;
 384                 }
 385
 386                 if (split)
 387                         offset += BUFLEN_16K;
 388         }
 389         count++;
 390
 391         if (idx) {
 392                 ll = 1;
 393                 dma_addr = dma_map_single(dev, exp_bufs,
 394                                           sizeof(u64) * MAX_EXP_BUFFS,
 395                                           DMA_TO_DEVICE);
 396                 if (dma_mapping_error(dev, dma_addr)) {
 397                         dev_kfree_skb_any(skb);
 398                         return -EINVAL;
 399                 }
 400                 i = ell_bytes >> LL_BYTES_LSB_LEN;
 401                 exp_desc[2] = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
 402                                           SET_VAL(LL_BYTES_MSB, i) |
 403                                           SET_VAL(LL_LEN, idx));
 404                 raw_desc->m2 = cpu_to_le64(SET_VAL(LL_BYTES_LSB, ell_bytes));
 405         }
 406
 407 out:
 408         raw_desc->m0 = cpu_to_le64(SET_VAL(LL, ll) | SET_VAL(NV, nv) |
 409                                    SET_VAL(USERINFO, tx_ring->tail));
 410         tx_ring->cp_ring->cp_skb[tx_ring->tail] = skb;
 411         pdata->tx_level[tx_ring->cp_ring->index] += count;
 412         tx_ring->tail = tail;
 413
 414         return count;
 415 }
 416
 417 static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
 418                                          struct net_device *ndev)
 419 {
 420         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 421         struct xgene_enet_desc_ring *tx_ring;
 422         int index = skb->queue_mapping;
 423         u32 tx_level = pdata->tx_level[index];
 424         int count;
 425
 426         tx_ring = pdata->tx_ring[index];
 427         if (tx_level < pdata->txc_level[index])
 428                 tx_level += ((typeof(pdata->tx_level[index]))~0U);
 429
 430         if ((tx_level - pdata->txc_level[index]) > pdata->tx_qcnt_hi) {
 431                 netif_stop_subqueue(ndev, index);
 432                 return NETDEV_TX_BUSY;
 433         }
 434
 435         if (skb_padto(skb, XGENE_MIN_ENET_FRAME_SIZE))
 436                 return NETDEV_TX_OK;
 437
 438         count = xgene_enet_setup_tx_desc(tx_ring, skb);
 439         if (count <= 0) {
 440                 dev_kfree_skb_any(skb);
 441                 return NETDEV_TX_OK;
 442         }
 443
 444         skb_tx_timestamp(skb);
 445
 446         pdata->stats.tx_packets++;
 447         pdata->stats.tx_bytes += skb->len;
 448
 449         pdata->ring_ops->wr_cmd(tx_ring, count);
 450         return NETDEV_TX_OK;
 451 }
 452
 453 static void xgene_enet_skip_csum(struct sk_buff *skb)
 454 {
 455         struct iphdr *iph = ip_hdr(skb);
 456
 457         if (!ip_is_fragment(iph) ||
 458             (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP)) {
 459                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 460         }
 461 }
 462
 463 static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
 464                                struct xgene_enet_raw_desc *raw_desc)
 465 {
 466         struct net_device *ndev;
 467         struct xgene_enet_pdata *pdata;
 468         struct device *dev;
 469         struct xgene_enet_desc_ring *buf_pool;
 470         u32 datalen, skb_index;
 471         struct sk_buff *skb;
 472         u8 status;
 473         int ret = 0;
 474
 475         ndev = rx_ring->ndev;
 476         pdata = netdev_priv(ndev);
 477         dev = ndev_to_dev(rx_ring->ndev);
 478         buf_pool = rx_ring->buf_pool;
 479
 480         dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
 481                          XGENE_ENET_MAX_MTU, DMA_FROM_DEVICE);
 482         skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
 483         skb = buf_pool->rx_skb[skb_index];
 484
 485         /* checking for error */
 486         status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
 487         if (unlikely(status > 2)) {
 488                 dev_kfree_skb_any(skb);
 489                 xgene_enet_parse_error(rx_ring, netdev_priv(rx_ring->ndev),
 490                                        status);
 491                 pdata->stats.rx_dropped++;
 492                 ret = -EIO;
 493                 goto out;
 494         }
 495
 496         /* strip off CRC as HW isn't doing this */
 497         datalen = GET_VAL(BUFDATALEN, le64_to_cpu(raw_desc->m1));
 498         datalen = (datalen & DATALEN_MASK) - 4;
 499         prefetch(skb->data - NET_IP_ALIGN);
 500         skb_put(skb, datalen);
 501
 502         skb_checksum_none_assert(skb);
 503         skb->protocol = eth_type_trans(skb, ndev);
 504         if (likely((ndev->features & NETIF_F_IP_CSUM) &&
 505                    skb->protocol == htons(ETH_P_IP))) {
 506                 xgene_enet_skip_csum(skb);
 507         }
 508
 509         pdata->stats.rx_packets++;
 510         pdata->stats.rx_bytes += datalen;
 511         napi_gro_receive(&rx_ring->napi, skb);
 512 out:
 513         if (--rx_ring->nbufpool == 0) {
 514                 ret = xgene_enet_refill_bufpool(buf_pool, NUM_BUFPOOL);
 515                 rx_ring->nbufpool = NUM_BUFPOOL;
 516         }
 517
 518         return ret;
 519 }
 520
 521 static bool is_rx_desc(struct xgene_enet_raw_desc *raw_desc)
 522 {
 523         return GET_VAL(FPQNUM, le64_to_cpu(raw_desc->m0)) ? true : false;
 524 }
 525
 526 static int xgene_enet_process_ring(struct xgene_enet_desc_ring *ring,
 527                                    int budget)
 528 {
 529         struct net_device *ndev = ring->ndev;
 530         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 531         struct xgene_enet_raw_desc *raw_desc, *exp_desc;
 532         u16 head = ring->head;
 533         u16 slots = ring->slots - 1;
 534         int ret, desc_count, count = 0, processed = 0;
 535         bool is_completion;
 536
 537         do {
 538                 raw_desc = &ring->raw_desc[head];
 539                 desc_count = 0;
 540                 is_completion = false;
 541                 exp_desc = NULL;
 542                 if (unlikely(xgene_enet_is_desc_slot_empty(raw_desc)))
 543                         break;
 544
 545                 /* read fpqnum field after dataaddr field */
 546                 dma_rmb();
 547                 if (GET_BIT(NV, le64_to_cpu(raw_desc->m0))) {
 548                         head = (head + 1) & slots;
 549                         exp_desc = &ring->raw_desc[head];
 550
 551                         if (unlikely(xgene_enet_is_desc_slot_empty(exp_desc))) {
 552                                 head = (head - 1) & slots;
 553                                 break;
 554                         }
 555                         dma_rmb();
 556                         count++;
 557                         desc_count++;
 558                 }
 559                 if (is_rx_desc(raw_desc)) {
 560                         ret = xgene_enet_rx_frame(ring, raw_desc);
 561                 } else {
 562                         ret = xgene_enet_tx_completion(ring, raw_desc);
 563                         is_completion = true;
 564                 }
 565                 xgene_enet_mark_desc_slot_empty(raw_desc);
 566                 if (exp_desc)
 567                         xgene_enet_mark_desc_slot_empty(exp_desc);
 568
 569                 head = (head + 1) & slots;
 570                 count++;
 571                 desc_count++;
 572                 processed++;
 573                 if (is_completion)
 574                         pdata->txc_level[ring->index] += desc_count;
 575
 576                 if (ret)
 577                         break;
 578         } while (--budget);
 579
 580         if (likely(count)) {
 581                 pdata->ring_ops->wr_cmd(ring, -count);
 582                 ring->head = head;
 583
 584                 if (__netif_subqueue_stopped(ndev, ring->index))
 585                         netif_start_subqueue(ndev, ring->index);
 586         }
 587
 588         return processed;
 589 }
 590
 591 static int xgene_enet_napi(struct napi_struct *napi, const int budget)
 592 {
 593         struct xgene_enet_desc_ring *ring;
 594         int processed;
 595
 596         ring = container_of(napi, struct xgene_enet_desc_ring, napi);
 597         processed = xgene_enet_process_ring(ring, budget);
 598
 599         if (processed != budget) {
 600                 napi_complete(napi);
 601                 enable_irq(ring->irq);
 602         }
 603
 604         return processed;
 605 }
 606
 607 static void xgene_enet_timeout(struct net_device *ndev)
 608 {
 609         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 610         struct netdev_queue *txq;
 611         int i;
 612
 613         pdata->mac_ops->reset(pdata);
 614
 615         for (i = 0; i < pdata->txq_cnt; i++) {
 616                 txq = netdev_get_tx_queue(ndev, i);
 617                 txq->trans_start = jiffies;
 618                 netif_tx_start_queue(txq);
 619         }
 620 }
 621
 622 static int xgene_enet_register_irq(struct net_device *ndev)
 623 {
 624         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 625         struct device *dev = ndev_to_dev(ndev);
 626         struct xgene_enet_desc_ring *ring;
 627         int ret = 0, i;
 628
 629         for (i = 0; i < pdata->rxq_cnt; i++) {
 630                 ring = pdata->rx_ring[i];
 631                 irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
 632                 ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq,
 633                                        IRQF_SHARED, ring->irq_name, ring);
 634                 if (ret) {
 635                         netdev_err(ndev, "Failed to request irq %s\n",
 636                                    ring->irq_name);
 637                 }
 638         }
 639
 640         for (i = 0; i < pdata->cq_cnt; i++) {
 641                 ring = pdata->tx_ring[i]->cp_ring;
 642                 irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
 643                 ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq,
 644                                        IRQF_SHARED, ring->irq_name, ring);
 645                 if (ret) {
 646                         netdev_err(ndev, "Failed to request irq %s\n",
 647                                    ring->irq_name);
 648                 }
 649         }
 650
 651         return ret;
 652 }
 653
 654 static void xgene_enet_free_irq(struct net_device *ndev)
 655 {
 656         struct xgene_enet_pdata *pdata;
 657         struct xgene_enet_desc_ring *ring;
 658         struct device *dev;
 659         int i;
 660
 661         pdata = netdev_priv(ndev);
 662         dev = ndev_to_dev(ndev);
 663
 664         for (i = 0; i < pdata->rxq_cnt; i++) {
 665                 ring = pdata->rx_ring[i];
 666                 irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
 667                 devm_free_irq(dev, ring->irq, ring);
 668         }
 669
 670         for (i = 0; i < pdata->cq_cnt; i++) {
 671                 ring = pdata->tx_ring[i]->cp_ring;
 672                 irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY);
 673                 devm_free_irq(dev, ring->irq, ring);
 674         }
 675 }
 676
 677 static void xgene_enet_napi_enable(struct xgene_enet_pdata *pdata)
 678 {
 679         struct napi_struct *napi;
 680         int i;
 681
 682         for (i = 0; i < pdata->rxq_cnt; i++) {
 683                 napi = &pdata->rx_ring[i]->napi;
 684                 napi_enable(napi);
 685         }
 686
 687         for (i = 0; i < pdata->cq_cnt; i++) {
 688                 napi = &pdata->tx_ring[i]->cp_ring->napi;
 689                 napi_enable(napi);
 690         }
 691 }
 692
 693 static void xgene_enet_napi_disable(struct xgene_enet_pdata *pdata)
 694 {
 695         struct napi_struct *napi;
 696         int i;
 697
 698         for (i = 0; i < pdata->rxq_cnt; i++) {
 699                 napi = &pdata->rx_ring[i]->napi;
 700                 napi_disable(napi);
 701         }
 702
 703         for (i = 0; i < pdata->cq_cnt; i++) {
 704                 napi = &pdata->tx_ring[i]->cp_ring->napi;
 705                 napi_disable(napi);
 706         }
 707 }
 708
 709 static int xgene_enet_open(struct net_device *ndev)
 710 {
 711         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 712         const struct xgene_mac_ops *mac_ops = pdata->mac_ops;
 713         int ret;
 714
 715         ret = netif_set_real_num_tx_queues(ndev, pdata->txq_cnt);
 716         if (ret)
 717                 return ret;
 718
 719         ret = netif_set_real_num_rx_queues(ndev, pdata->rxq_cnt);
 720         if (ret)
 721                 return ret;
 722
 723         mac_ops->tx_enable(pdata);
 724         mac_ops->rx_enable(pdata);
 725
 726         xgene_enet_napi_enable(pdata);
 727         ret = xgene_enet_register_irq(ndev);
 728         if (ret)
 729                 return ret;
 730
 731         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
 732                 phy_start(pdata->phy_dev);
 733         else
 734                 schedule_delayed_work(&pdata->link_work, PHY_POLL_LINK_OFF);
 735
 736         netif_start_queue(ndev);
 737
 738         return ret;
 739 }
 740
 741 static int xgene_enet_close(struct net_device *ndev)
 742 {
 743         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 744         const struct xgene_mac_ops *mac_ops = pdata->mac_ops;
 745         int i;
 746
 747         netif_stop_queue(ndev);
 748
 749         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
 750                 phy_stop(pdata->phy_dev);
 751         else
 752                 cancel_delayed_work_sync(&pdata->link_work);
 753
 754         mac_ops->tx_disable(pdata);
 755         mac_ops->rx_disable(pdata);
 756
 757         xgene_enet_free_irq(ndev);
 758         xgene_enet_napi_disable(pdata);
 759         for (i = 0; i < pdata->rxq_cnt; i++)
 760                 xgene_enet_process_ring(pdata->rx_ring[i], -1);
 761
 762         return 0;
 763 }
 764
 765 static void xgene_enet_delete_ring(struct xgene_enet_desc_ring *ring)
 766 {
 767         struct xgene_enet_pdata *pdata;
 768         struct device *dev;
 769
 770         pdata = netdev_priv(ring->ndev);
 771         dev = ndev_to_dev(ring->ndev);
 772
 773         pdata->ring_ops->clear(ring);
 774         dma_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
 775 }
 776
 777 static void xgene_enet_delete_desc_rings(struct xgene_enet_pdata *pdata)
 778 {
 779         struct xgene_enet_desc_ring *buf_pool;
 780         struct xgene_enet_desc_ring *ring;
 781         int i;
 782
 783         for (i = 0; i < pdata->txq_cnt; i++) {
 784                 ring = pdata->tx_ring[i];
 785                 if (ring) {
 786                         xgene_enet_delete_ring(ring);
 787                         pdata->tx_ring[i] = NULL;
 788                 }
 789         }
 790
 791         for (i = 0; i < pdata->rxq_cnt; i++) {
 792                 ring = pdata->rx_ring[i];
 793                 if (ring) {
 794                         buf_pool = ring->buf_pool;
 795                         xgene_enet_delete_bufpool(buf_pool);
 796                         xgene_enet_delete_ring(buf_pool);
 797                         xgene_enet_delete_ring(ring);
 798                         pdata->rx_ring[i] = NULL;
 799                 }
 800         }
 801 }
 802
 803 static int xgene_enet_get_ring_size(struct device *dev,
 804                                     enum xgene_enet_ring_cfgsize cfgsize)
 805 {
 806         int size = -EINVAL;
 807
 808         switch (cfgsize) {
 809         case RING_CFGSIZE_512B:
 810                 size = 0x200;
 811                 break;
 812         case RING_CFGSIZE_2KB:
 813                 size = 0x800;
 814                 break;
 815         case RING_CFGSIZE_16KB:
 816                 size = 0x4000;
 817                 break;
 818         case RING_CFGSIZE_64KB:
 819                 size = 0x10000;
 820                 break;
 821         case RING_CFGSIZE_512KB:
 822                 size = 0x80000;
 823                 break;
 824         default:
 825                 dev_err(dev, "Unsupported cfg ring size %d\n", cfgsize);
 826                 break;
 827         }
 828
 829         return size;
 830 }
 831
 832 static void xgene_enet_free_desc_ring(struct xgene_enet_desc_ring *ring)
 833 {
 834         struct xgene_enet_pdata *pdata;
 835         struct device *dev;
 836
 837         if (!ring)
 838                 return;
 839
 840         dev = ndev_to_dev(ring->ndev);
 841         pdata = netdev_priv(ring->ndev);
 842
 843         if (ring->desc_addr) {
 844                 pdata->ring_ops->clear(ring);
 845                 dma_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
 846         }
 847         devm_kfree(dev, ring);
 848 }
 849
 850 static void xgene_enet_free_desc_rings(struct xgene_enet_pdata *pdata)
 851 {
 852         struct device *dev = &pdata->pdev->dev;
 853         struct xgene_enet_desc_ring *ring;
 854         int i;
 855
 856         for (i = 0; i < pdata->txq_cnt; i++) {
 857                 ring = pdata->tx_ring[i];
 858                 if (ring) {
 859                         if (ring->cp_ring && ring->cp_ring->cp_skb)
 860                                 devm_kfree(dev, ring->cp_ring->cp_skb);
 861                         if (ring->cp_ring && pdata->cq_cnt)
 862                                 xgene_enet_free_desc_ring(ring->cp_ring);
 863                         xgene_enet_free_desc_ring(ring);
 864                 }
 865         }
 866
 867         for (i = 0; i < pdata->rxq_cnt; i++) {
 868                 ring = pdata->rx_ring[i];
 869                 if (ring) {
 870                         if (ring->buf_pool) {
 871                                 if (ring->buf_pool->rx_skb)
 872                                         devm_kfree(dev, ring->buf_pool->rx_skb);
 873                                 xgene_enet_free_desc_ring(ring->buf_pool);
 874                         }
 875                         xgene_enet_free_desc_ring(ring);
 876                 }
 877         }
 878 }
 879
 880 static bool is_irq_mbox_required(struct xgene_enet_pdata *pdata,
 881                                  struct xgene_enet_desc_ring *ring)
 882 {
 883         if ((pdata->enet_id == XGENE_ENET2) &&
 884             (xgene_enet_ring_owner(ring->id) == RING_OWNER_CPU)) {
 885                 return true;
 886         }
 887
 888         return false;
 889 }
 890
 891 static void __iomem *xgene_enet_ring_cmd_base(struct xgene_enet_pdata *pdata,
 892                                               struct xgene_enet_desc_ring *ring)
 893 {
 894         u8 num_ring_id_shift = pdata->ring_ops->num_ring_id_shift;
 895
 896         return pdata->ring_cmd_addr + (ring->num << num_ring_id_shift);
 897 }
 898
 899 static struct xgene_enet_desc_ring *xgene_enet_create_desc_ring(
 900                         struct net_device *ndev, u32 ring_num,
 901                         enum xgene_enet_ring_cfgsize cfgsize, u32 ring_id)
 902 {
 903         struct xgene_enet_desc_ring *ring;
 904         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 905         struct device *dev = ndev_to_dev(ndev);
 906         int size;
 907
 908         size = xgene_enet_get_ring_size(dev, cfgsize);
 909         if (size < 0)
 910                 return NULL;
 911
 912         ring = devm_kzalloc(dev, sizeof(struct xgene_enet_desc_ring),
 913                             GFP_KERNEL);
 914         if (!ring)
 915                 return NULL;
 916
 917         ring->ndev = ndev;
 918         ring->num = ring_num;
 919         ring->cfgsize = cfgsize;
 920         ring->id = ring_id;
 921
 922         ring->desc_addr = dma_zalloc_coherent(dev, size, &ring->dma,
 923                                               GFP_KERNEL);
 924         if (!ring->desc_addr) {
 925                 devm_kfree(dev, ring);
 926                 return NULL;
 927         }
 928         ring->size = size;
 929
 930         if (is_irq_mbox_required(pdata, ring)) {
 931                 ring->irq_mbox_addr = dma_zalloc_coherent(dev, INTR_MBOX_SIZE,
 932                                 &ring->irq_mbox_dma, GFP_KERNEL);
 933                 if (!ring->irq_mbox_addr) {
 934                         dma_free_coherent(dev, size, ring->desc_addr,
 935                                           ring->dma);
 936                         devm_kfree(dev, ring);
 937                         return NULL;
 938                 }
 939         }
 940
 941         ring->cmd_base = xgene_enet_ring_cmd_base(pdata, ring);
 942         ring->cmd = ring->cmd_base + INC_DEC_CMD_ADDR;
 943         ring = pdata->ring_ops->setup(ring);
 944         netdev_dbg(ndev, "ring info: num=%d  size=%d  id=%d  slots=%d\n",
 945                    ring->num, ring->size, ring->id, ring->slots);
 946
 947         return ring;
 948 }
 949
 950 static u16 xgene_enet_get_ring_id(enum xgene_ring_owner owner, u8 bufnum)
 951 {
 952         return (owner << 6) | (bufnum & GENMASK(5, 0));
 953 }
 954
 955 static enum xgene_ring_owner xgene_derive_ring_owner(struct xgene_enet_pdata *p)
 956 {
 957         enum xgene_ring_owner owner;
 958
 959         if (p->enet_id == XGENE_ENET1) {
 960                 switch (p->phy_mode) {
 961                 case PHY_INTERFACE_MODE_SGMII:
 962                         owner = RING_OWNER_ETH0;
 963                         break;
 964                 default:
 965                         owner = (!p->port_id) ? RING_OWNER_ETH0 :
 966                                                 RING_OWNER_ETH1;
 967                         break;
 968                 }
 969         } else {
 970                 owner = (!p->port_id) ? RING_OWNER_ETH0 : RING_OWNER_ETH1;
 971         }
 972
 973         return owner;
 974 }
 975
 976 static int xgene_enet_create_desc_rings(struct net_device *ndev)
 977 {
 978         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
 979         struct device *dev = ndev_to_dev(ndev);
 980         struct xgene_enet_desc_ring *rx_ring, *tx_ring, *cp_ring;
 981         struct xgene_enet_desc_ring *buf_pool = NULL;
 982         enum xgene_ring_owner owner;
 983         dma_addr_t dma_exp_bufs;
 984         u8 cpu_bufnum = pdata->cpu_bufnum;
 985         u8 eth_bufnum = pdata->eth_bufnum;
 986         u8 bp_bufnum = pdata->bp_bufnum;
 987         u16 ring_num = pdata->ring_num;
 988         u16 ring_id;
 989         int i, ret, size;
 990
 991         for (i = 0; i < pdata->rxq_cnt; i++) {
 992                 /* allocate rx descriptor ring */
 993                 owner = xgene_derive_ring_owner(pdata);
 994                 ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, cpu_bufnum++);
 995                 rx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
 996                                                       RING_CFGSIZE_16KB,
 997                                                       ring_id);
 998                 if (!rx_ring) {
 999                         ret = -ENOMEM;
1000                         goto err;
1001                 }
1002
1003                 /* allocate buffer pool for receiving packets */
1004                 owner = xgene_derive_ring_owner(pdata);
1005                 ring_id = xgene_enet_get_ring_id(owner, bp_bufnum++);
1006                 buf_pool = xgene_enet_create_desc_ring(ndev, ring_num++,
1007                                                        RING_CFGSIZE_2KB,
1008                                                        ring_id);
1009                 if (!buf_pool) {
1010                         ret = -ENOMEM;
1011                         goto err;
1012                 }
1013
1014                 rx_ring->nbufpool = NUM_BUFPOOL;
1015                 rx_ring->buf_pool = buf_pool;
1016                 rx_ring->irq = pdata->irqs[i];
1017                 if (!pdata->cq_cnt) {
1018                         snprintf(rx_ring->irq_name, IRQ_ID_SIZE, "%s-rx-txc",
1019                                  ndev->name);
1020                 } else {
1021                         snprintf(rx_ring->irq_name, IRQ_ID_SIZE, "%s-rx%d",
1022                                  ndev->name, i);
1023                 }
1024                 buf_pool->rx_skb = devm_kcalloc(dev, buf_pool->slots,
1025                                                 sizeof(struct sk_buff *),
1026                                                 GFP_KERNEL);
1027                 if (!buf_pool->rx_skb) {
1028                         ret = -ENOMEM;
1029                         goto err;
1030                 }
1031
1032                 buf_pool->dst_ring_num = xgene_enet_dst_ring_num(buf_pool);
1033                 rx_ring->buf_pool = buf_pool;
1034                 pdata->rx_ring[i] = rx_ring;
1035         }
1036
1037         for (i = 0; i < pdata->txq_cnt; i++) {
1038                 /* allocate tx descriptor ring */
1039                 owner = xgene_derive_ring_owner(pdata);
1040                 ring_id = xgene_enet_get_ring_id(owner, eth_bufnum++);
1041                 tx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
1042                                                       RING_CFGSIZE_16KB,
1043                                                       ring_id);
1044                 if (!tx_ring) {
1045                         ret = -ENOMEM;
1046                         goto err;
1047                 }
1048
1049                 size = (tx_ring->slots / 2) * sizeof(__le64) * MAX_EXP_BUFFS;
1050                 tx_ring->exp_bufs = dma_zalloc_coherent(dev, size,
1051                                                         &dma_exp_bufs,
1052                                                         GFP_KERNEL);
1053                 if (!tx_ring->exp_bufs) {
1054                         ret = -ENOMEM;
1055                         goto err;
1056                 }
1057
1058                 pdata->tx_ring[i] = tx_ring;
1059
1060                 if (!pdata->cq_cnt) {
1061                         cp_ring = pdata->rx_ring[i];
1062                 } else {
1063                         /* allocate tx completion descriptor ring */
1064                         ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU,
1065                                                          cpu_bufnum++);
1066                         cp_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
1067                                                               RING_CFGSIZE_16KB,
1068                                                               ring_id);
1069                         if (!cp_ring) {
1070                                 ret = -ENOMEM;
1071                                 goto err;
1072                         }
1073
1074                         cp_ring->irq = pdata->irqs[pdata->rxq_cnt + i];
1075                         cp_ring->index = i;
1076                         snprintf(cp_ring->irq_name, IRQ_ID_SIZE, "%s-txc%d",
1077                                  ndev->name, i);
1078                 }
1079
1080                 cp_ring->cp_skb = devm_kcalloc(dev, tx_ring->slots,
1081                                                sizeof(struct sk_buff *),
1082                                                GFP_KERNEL);
1083                 if (!cp_ring->cp_skb) {
1084                         ret = -ENOMEM;
1085                         goto err;
1086                 }
1087
1088                 size = sizeof(dma_addr_t) * MAX_SKB_FRAGS;
1089                 cp_ring->frag_dma_addr = devm_kcalloc(dev, tx_ring->slots,
1090                                                       size, GFP_KERNEL);
1091                 if (!cp_ring->frag_dma_addr) {
1092                         devm_kfree(dev, cp_ring->cp_skb);
1093                         ret = -ENOMEM;
1094                         goto err;
1095                 }
1096
1097                 tx_ring->cp_ring = cp_ring;
1098                 tx_ring->dst_ring_num = xgene_enet_dst_ring_num(cp_ring);
1099         }
1100
1101         pdata->ring_ops->coalesce(pdata->tx_ring[0]);
1102         pdata->tx_qcnt_hi = pdata->tx_ring[0]->slots - 128;
1103
1104         return 0;
1105
1106 err:
1107         xgene_enet_free_desc_rings(pdata);
1108         return ret;
1109 }
1110
1111 static struct rtnl_link_stats64 *xgene_enet_get_stats64(
1112                         struct net_device *ndev,
1113                         struct rtnl_link_stats64 *storage)
1114 {
1115         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
1116         struct rtnl_link_stats64 *stats = &pdata->stats;
1117
1118         stats->rx_errors += stats->rx_length_errors +
1119                             stats->rx_crc_errors +
1120                             stats->rx_frame_errors +
1121                             stats->rx_fifo_errors;
1122         memcpy(storage, &pdata->stats, sizeof(struct rtnl_link_stats64));
1123
1124         return storage;
1125 }
1126
1127 static int xgene_enet_set_mac_address(struct net_device *ndev, void *addr)
1128 {
1129         struct xgene_enet_pdata *pdata = netdev_priv(ndev);
1130         int ret;
1131
1132         ret = eth_mac_addr(ndev, addr);
1133         if (ret)
1134                 return ret;
1135         pdata->mac_ops->set_mac_addr(pdata);
1136
1137         return ret;
1138 }
1139
1140 static const struct net_device_ops xgene_ndev_ops = {
1141         .ndo_open = xgene_enet_open,
1142         .ndo_stop = xgene_enet_close,
1143         .ndo_start_xmit = xgene_enet_start_xmit,
1144         .ndo_tx_timeout = xgene_enet_timeout,
1145         .ndo_get_stats64 = xgene_enet_get_stats64,
1146         .ndo_change_mtu = eth_change_mtu,
1147         .ndo_set_mac_address = xgene_enet_set_mac_address,
1148 };
1149
1150 #ifdef CONFIG_ACPI
1151 static void xgene_get_port_id_acpi(struct device *dev,
1152                                   struct xgene_enet_pdata *pdata)
1153 {
1154         acpi_status status;
1155         u64 temp;
1156
1157         status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_SUN", NULL, &temp);
1158         if (ACPI_FAILURE(status)) {
1159                 pdata->port_id = 0;
1160         } else {
1161                 pdata->port_id = temp;
1162         }
1163
1164         return;
1165 }
1166 #endif
1167
1168 static void xgene_get_port_id_dt(struct device *dev, struct xgene_enet_pdata *pdata)
1169 {
1170         u32 id = 0;
1171
1172         of_property_read_u32(dev->of_node, "port-id", &id);
1173
1174         pdata->port_id = id & BIT(0);
1175
1176         return;
1177 }
1178
1179 static int xgene_get_tx_delay(struct xgene_enet_pdata *pdata)
1180 {
1181         struct device *dev = &pdata->pdev->dev;
1182         int delay, ret;
1183
1184         ret = of_property_read_u32(dev->of_node, "tx-delay", &delay);
1185         if (ret) {
1186                 pdata->tx_delay = 4;
1187                 return 0;
1188         }
1189
1190         if (delay < 0 || delay > 7) {
1191                 dev_err(dev, "Invalid tx-delay specified\n");
1192                 return -EINVAL;
1193         }
1194
1195         pdata->tx_delay = delay;
1196
1197         return 0;
1198 }
1199
1200 static int xgene_get_rx_delay(struct xgene_enet_pdata *pdata)
1201 {
1202         struct device *dev = &pdata->pdev->dev;
1203         int delay, ret;
1204
1205         ret = of_property_read_u32(dev->of_node, "rx-delay", &delay);
1206         if (ret) {
1207                 pdata->rx_delay = 2;
1208                 return 0;
1209         }
1210
1211         if (delay < 0 || delay > 7) {
1212                 dev_err(dev, "Invalid rx-delay specified\n");
1213                 return -EINVAL;
1214         }
1215
1216         pdata->rx_delay = delay;
1217
1218         return 0;
1219 }
1220
1221 static int xgene_enet_get_irqs(struct xgene_enet_pdata *pdata)
1222 {
1223         struct platform_device *pdev = pdata->pdev;
1224         struct device *dev = &pdev->dev;
1225         int i, ret, max_irqs;
1226
1227         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
1228                 max_irqs = 1;
1229         else if (pdata->phy_mode == PHY_INTERFACE_MODE_SGMII)
1230                 max_irqs = 2;
1231         else
1232                 max_irqs = XGENE_MAX_ENET_IRQ;
1233
1234         for (i = 0; i < max_irqs; i++) {
1235                 ret = platform_get_irq(pdev, i);
1236                 if (ret <= 0) {
1237                         dev_err(dev, "Unable to get ENET IRQ\n");
1238                         ret = ret ? : -ENXIO;
1239                         return ret;
1240                 }
1241                 pdata->irqs[i] = ret;
1242         }
1243
1244         return 0;
1245 }
1246
1247 static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
1248 {
1249         struct platform_device *pdev;
1250         struct net_device *ndev;
1251         struct device *dev;
1252         struct resource *res;
1253         void __iomem *base_addr;
1254         u32 offset;
1255         int ret = 0;
1256
1257         pdev = pdata->pdev;
1258         dev = &pdev->dev;
1259         ndev = pdata->ndev;
1260
1261         res = platform_get_resource(pdev, IORESOURCE_MEM, RES_ENET_CSR);
1262         if (!res) {
1263                 dev_err(dev, "Resource enet_csr not defined\n");
1264                 return -ENODEV;
1265         }
1266         pdata->base_addr = devm_ioremap(dev, res->start, resource_size(res));
1267         if (!pdata->base_addr) {
1268                 dev_err(dev, "Unable to retrieve ENET Port CSR region\n");
1269                 return -ENOMEM;
1270         }
1271
1272         res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CSR);
1273         if (!res) {
1274                 dev_err(dev, "Resource ring_csr not defined\n");
1275                 return -ENODEV;
1276         }
1277         pdata->ring_csr_addr = devm_ioremap(dev, res->start,
1278                                                         resource_size(res));
1279         if (!pdata->ring_csr_addr) {
1280                 dev_err(dev, "Unable to retrieve ENET Ring CSR region\n");
1281                 return -ENOMEM;
1282         }
1283
1284         res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CMD);
1285         if (!res) {
1286                 dev_err(dev, "Resource ring_cmd not defined\n");
1287                 return -ENODEV;
1288         }
1289         pdata->ring_cmd_addr = devm_ioremap(dev, res->start,
1290                                                         resource_size(res));
1291         if (!pdata->ring_cmd_addr) {
1292                 dev_err(dev, "Unable to retrieve ENET Ring command region\n");
1293                 return -ENOMEM;
1294         }
1295
1296         if (dev->of_node)
1297                 xgene_get_port_id_dt(dev, pdata);
1298 #ifdef CONFIG_ACPI
1299         else
1300                 xgene_get_port_id_acpi(dev, pdata);
1301 #endif
1302
1303         if (!device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN))
1304                 eth_hw_addr_random(ndev);
1305
1306         memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len);
1307
1308         pdata->phy_mode = device_get_phy_mode(dev);
1309         if (pdata->phy_mode < 0) {
1310                 dev_err(dev, "Unable to get phy-connection-type\n");
1311                 return pdata->phy_mode;
1312         }
1313         if (pdata->phy_mode != PHY_INTERFACE_MODE_RGMII &&
1314             pdata->phy_mode != PHY_INTERFACE_MODE_SGMII &&
1315             pdata->phy_mode != PHY_INTERFACE_MODE_XGMII) {
1316                 dev_err(dev, "Incorrect phy-connection-type specified\n");
1317                 return -ENODEV;
1318         }
1319
1320         ret = xgene_get_tx_delay(pdata);
1321         if (ret)
1322                 return ret;
1323
1324         ret = xgene_get_rx_delay(pdata);
1325         if (ret)
1326                 return ret;
1327
1328         ret = xgene_enet_get_irqs(pdata);
1329         if (ret)
1330                 return ret;
1331
1332         pdata->clk = devm_clk_get(&pdev->dev, NULL);
1333         if (IS_ERR(pdata->clk)) {
1334                 /* Firmware may have set up the clock already. */
1335                 dev_info(dev, "clocks have been setup already\n");
1336         }
1337
1338         if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII)
1339                 base_addr = pdata->base_addr - (pdata->port_id * MAC_OFFSET);
1340         else
1341                 base_addr = pdata->base_addr;
1342         pdata->eth_csr_addr = base_addr + BLOCK_ETH_CSR_OFFSET;
1343         pdata->cle.base = base_addr + BLOCK_ETH_CLE_CSR_OFFSET;
1344         pdata->eth_ring_if_addr = base_addr + BLOCK_ETH_RING_IF_OFFSET;
1345         pdata->eth_diag_csr_addr = base_addr + BLOCK_ETH_DIAG_CSR_OFFSET;
1346         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII ||
1347             pdata->phy_mode == PHY_INTERFACE_MODE_SGMII) {
1348                 pdata->mcx_mac_addr = pdata->base_addr + BLOCK_ETH_MAC_OFFSET;
1349                 offset = (pdata->enet_id == XGENE_ENET1) ?
1350                           BLOCK_ETH_MAC_CSR_OFFSET :
1351                           X2_BLOCK_ETH_MAC_CSR_OFFSET;
1352                 pdata->mcx_mac_csr_addr = base_addr + offset;
1353         } else {
1354                 pdata->mcx_mac_addr = base_addr + BLOCK_AXG_MAC_OFFSET;
1355                 pdata->mcx_mac_csr_addr = base_addr + BLOCK_AXG_MAC_CSR_OFFSET;
1356         }
1357         pdata->rx_buff_cnt = NUM_PKT_BUF;
1358
1359         return 0;
1360 }
1361
1362 static int xgene_enet_init_hw(struct xgene_enet_pdata *pdata)
1363 {
1364         struct xgene_enet_cle *enet_cle = &pdata->cle;
1365         struct net_device *ndev = pdata->ndev;
1366         struct xgene_enet_desc_ring *buf_pool;
1367         u16 dst_ring_num;
1368         int i, ret;
1369
1370         ret = pdata->port_ops->reset(pdata);
1371         if (ret)
1372                 return ret;
1373
1374         ret = xgene_enet_create_desc_rings(ndev);
1375         if (ret) {
1376                 netdev_err(ndev, "Error in ring configuration\n");
1377                 return ret;
1378         }
1379
1380         /* setup buffer pool */
1381         for (i = 0; i < pdata->rxq_cnt; i++) {
1382                 buf_pool = pdata->rx_ring[i]->buf_pool;
1383                 xgene_enet_init_bufpool(buf_pool);
1384                 ret = xgene_enet_refill_bufpool(buf_pool, pdata->rx_buff_cnt);
1385                 if (ret) {
1386                         xgene_enet_delete_desc_rings(pdata);
1387                         return ret;
1388                 }
1389         }
1390
1391         dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring[0]);
1392         buf_pool = pdata->rx_ring[0]->buf_pool;
1393         if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
1394                 /* Initialize and Enable  PreClassifier Tree */
1395                 enet_cle->max_nodes = 512;
1396                 enet_cle->max_dbptrs = 1024;
1397                 enet_cle->parsers = 3;
1398                 enet_cle->active_parser = PARSER_ALL;
1399                 enet_cle->ptree.start_node = 0;
1400                 enet_cle->ptree.start_dbptr = 0;
1401                 enet_cle->jump_bytes = 8;
1402                 ret = pdata->cle_ops->cle_init(pdata);
1403                 if (ret) {
1404                         netdev_err(ndev, "Preclass Tree init error\n");
1405                         return ret;
1406                 }
1407         } else {
1408                 pdata->port_ops->cle_bypass(pdata, dst_ring_num, buf_pool->id);
1409         }
1410
1411         pdata->mac_ops->init(pdata);
1412
1413         return ret;
1414 }
1415
1416 static void xgene_enet_setup_ops(struct xgene_enet_pdata *pdata)
1417 {
1418         switch (pdata->phy_mode) {
1419         case PHY_INTERFACE_MODE_RGMII:
1420                 pdata->mac_ops = &xgene_gmac_ops;
1421                 pdata->port_ops = &xgene_gport_ops;
1422                 pdata->rm = RM3;
1423                 pdata->rxq_cnt = 1;
1424                 pdata->txq_cnt = 1;
1425                 pdata->cq_cnt = 0;
1426                 break;
1427         case PHY_INTERFACE_MODE_SGMII:
1428                 pdata->mac_ops = &xgene_sgmac_ops;
1429                 pdata->port_ops = &xgene_sgport_ops;
1430                 pdata->rm = RM1;
1431                 pdata->rxq_cnt = 1;
1432                 pdata->txq_cnt = 1;
1433                 pdata->cq_cnt = 1;
1434                 break;
1435         default:
1436                 pdata->mac_ops = &xgene_xgmac_ops;
1437                 pdata->port_ops = &xgene_xgport_ops;
1438                 pdata->cle_ops = &xgene_cle3in_ops;
1439                 pdata->rm = RM0;
1440                 pdata->rxq_cnt = XGENE_NUM_RX_RING;
1441                 pdata->txq_cnt = XGENE_NUM_TX_RING;
1442                 pdata->cq_cnt = XGENE_NUM_TXC_RING;
1443                 break;
1444         }
1445
1446         if (pdata->enet_id == XGENE_ENET1) {
1447                 switch (pdata->port_id) {
1448                 case 0:
1449                         pdata->cpu_bufnum = START_CPU_BUFNUM_0;
1450                         pdata->eth_bufnum = START_ETH_BUFNUM_0;
1451                         pdata->bp_bufnum = START_BP_BUFNUM_0;
1452                         pdata->ring_num = START_RING_NUM_0;
1453                         break;
1454                 case 1:
1455                         if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
1456                                 pdata->cpu_bufnum = XG_START_CPU_BUFNUM_1;
1457                                 pdata->eth_bufnum = XG_START_ETH_BUFNUM_1;
1458                                 pdata->bp_bufnum = XG_START_BP_BUFNUM_1;
1459                                 pdata->ring_num = XG_START_RING_NUM_1;
1460                         } else {
1461                                 pdata->cpu_bufnum = START_CPU_BUFNUM_1;
1462                                 pdata->eth_bufnum = START_ETH_BUFNUM_1;
1463                                 pdata->bp_bufnum = START_BP_BUFNUM_1;
1464                                 pdata->ring_num = START_RING_NUM_1;
1465                         }
1466                         break;
1467                 default:
1468                         break;
1469                 }
1470                 pdata->ring_ops = &xgene_ring1_ops;
1471         } else {
1472                 switch (pdata->port_id) {
1473                 case 0:
1474                         pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0;
1475                         pdata->eth_bufnum = X2_START_ETH_BUFNUM_0;
1476                         pdata->bp_bufnum = X2_START_BP_BUFNUM_0;
1477                         pdata->ring_num = X2_START_RING_NUM_0;
1478                         break;
1479                 case 1:
1480                         pdata->cpu_bufnum = X2_START_CPU_BUFNUM_1;
1481                         pdata->eth_bufnum = X2_START_ETH_BUFNUM_1;
1482                         pdata->bp_bufnum = X2_START_BP_BUFNUM_1;
1483                         pdata->ring_num = X2_START_RING_NUM_1;
1484                         break;
1485                 default:
1486                         break;
1487                 }
1488                 pdata->rm = RM0;
1489                 pdata->ring_ops = &xgene_ring2_ops;
1490         }
1491 }
1492
1493 static void xgene_enet_napi_add(struct xgene_enet_pdata *pdata)
1494 {
1495         struct napi_struct *napi;
1496         int i;
1497
1498         for (i = 0; i < pdata->rxq_cnt; i++) {
1499                 napi = &pdata->rx_ring[i]->napi;
1500                 netif_napi_add(pdata->ndev, napi, xgene_enet_napi,
1501                                NAPI_POLL_WEIGHT);
1502         }
1503
1504         for (i = 0; i < pdata->cq_cnt; i++) {
1505                 napi = &pdata->tx_ring[i]->cp_ring->napi;
1506                 netif_napi_add(pdata->ndev, napi, xgene_enet_napi,
1507                                NAPI_POLL_WEIGHT);
1508         }
1509 }
1510
1511 static void xgene_enet_napi_del(struct xgene_enet_pdata *pdata)
1512 {
1513         struct napi_struct *napi;
1514         int i;
1515
1516         for (i = 0; i < pdata->rxq_cnt; i++) {
1517                 napi = &pdata->rx_ring[i]->napi;
1518                 netif_napi_del(napi);
1519         }
1520
1521         for (i = 0; i < pdata->cq_cnt; i++) {
1522                 napi = &pdata->tx_ring[i]->cp_ring->napi;
1523                 netif_napi_del(napi);
1524         }
1525 }
1526
1527 static int xgene_enet_probe(struct platform_device *pdev)
1528 {
1529         struct net_device *ndev;
1530         struct xgene_enet_pdata *pdata;
1531         struct device *dev = &pdev->dev;
1532         const struct xgene_mac_ops *mac_ops;
1533         const struct of_device_id *of_id;
1534         int ret;
1535
1536         ndev = alloc_etherdev_mqs(sizeof(struct xgene_enet_pdata),
1537                                   XGENE_NUM_RX_RING, XGENE_NUM_TX_RING);
1538         if (!ndev)
1539                 return -ENOMEM;
1540
1541         pdata = netdev_priv(ndev);
1542
1543         pdata->pdev = pdev;
1544         pdata->ndev = ndev;
1545         SET_NETDEV_DEV(ndev, dev);
1546         platform_set_drvdata(pdev, pdata);
1547         ndev->netdev_ops = &xgene_ndev_ops;
1548         xgene_enet_set_ethtool_ops(ndev);
1549         ndev->features |= NETIF_F_IP_CSUM |
1550                           NETIF_F_GSO |
1551                           NETIF_F_GRO |
1552                           NETIF_F_SG;
1553
1554         of_id = of_match_device(xgene_enet_of_match, &pdev->dev);
1555         if (of_id) {
1556                 pdata->enet_id = (enum xgene_enet_id)of_id->data;
1557         }
1558 #ifdef CONFIG_ACPI
1559         else {
1560                 const struct acpi_device_id *acpi_id;
1561
1562                 acpi_id = acpi_match_device(xgene_enet_acpi_match, &pdev->dev);
1563                 if (acpi_id)
1564                         pdata->enet_id = (enum xgene_enet_id) acpi_id->driver_data;
1565         }
1566 #endif
1567         if (!pdata->enet_id) {
1568                 free_netdev(ndev);
1569                 return -ENODEV;
1570         }
1571
1572         ret = xgene_enet_get_resources(pdata);
1573         if (ret)
1574                 goto err;
1575
1576         xgene_enet_setup_ops(pdata);
1577
1578         if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) {
1579                 ndev->features |= NETIF_F_TSO;
1580                 pdata->mss = XGENE_ENET_MSS;
1581         }
1582         ndev->hw_features = ndev->features;
1583
1584         ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
1585         if (ret) {
1586                 netdev_err(ndev, "No usable DMA configuration\n");
1587                 goto err;
1588         }
1589
1590         ret = register_netdev(ndev);
1591         if (ret) {
1592                 netdev_err(ndev, "Failed to register netdev\n");
1593                 goto err;
1594         }
1595
1596         ret = xgene_enet_init_hw(pdata);
1597         if (ret)
1598                 goto err;
1599
1600         mac_ops = pdata->mac_ops;
1601         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII) {
1602                 ret = xgene_enet_mdio_config(pdata);
1603                 if (ret)
1604                         goto err;
1605         } else {
1606                 INIT_DELAYED_WORK(&pdata->link_work, mac_ops->link_state);
1607         }
1608
1609         xgene_enet_napi_add(pdata);
1610         return 0;
1611 err:
1612         unregister_netdev(ndev);
1613         free_netdev(ndev);
1614         return ret;
1615 }
1616
1617 static int xgene_enet_remove(struct platform_device *pdev)
1618 {
1619         struct xgene_enet_pdata *pdata;
1620         const struct xgene_mac_ops *mac_ops;
1621         struct net_device *ndev;
1622
1623         pdata = platform_get_drvdata(pdev);
1624         mac_ops = pdata->mac_ops;
1625         ndev = pdata->ndev;
1626
1627         mac_ops->rx_disable(pdata);
1628         mac_ops->tx_disable(pdata);
1629
1630         xgene_enet_napi_del(pdata);
1631         if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII)
1632                 xgene_enet_mdio_remove(pdata);
1633         unregister_netdev(ndev);
1634         xgene_enet_delete_desc_rings(pdata);
1635         pdata->port_ops->shutdown(pdata);
1636         free_netdev(ndev);
1637
1638         return 0;
1639 }
1640
1641 #ifdef CONFIG_ACPI
1642 static const struct acpi_device_id xgene_enet_acpi_match[] = {
1643         { "APMC0D05", XGENE_ENET1},
1644         { "APMC0D30", XGENE_ENET1},
1645         { "APMC0D31", XGENE_ENET1},
1646         { "APMC0D3F", XGENE_ENET1},
1647         { "APMC0D26", XGENE_ENET2},
1648         { "APMC0D25", XGENE_ENET2},
1649         { }
1650 };
1651 MODULE_DEVICE_TABLE(acpi, xgene_enet_acpi_match);
1652 #endif
1653
1654 #ifdef CONFIG_OF
1655 static const struct of_device_id xgene_enet_of_match[] = {
1656         {.compatible = "apm,xgene-enet",    .data = (void *)XGENE_ENET1},
1657         {.compatible = "apm,xgene1-sgenet", .data = (void *)XGENE_ENET1},
1658         {.compatible = "apm,xgene1-xgenet", .data = (void *)XGENE_ENET1},
1659         {.compatible = "apm,xgene2-sgenet", .data = (void *)XGENE_ENET2},
1660         {.compatible = "apm,xgene2-xgenet", .data = (void *)XGENE_ENET2},
1661         {},
1662 };
1663
1664 MODULE_DEVICE_TABLE(of, xgene_enet_of_match);
1665 #endif
1666
1667 static struct platform_driver xgene_enet_driver = {
1668         .driver = {
1669                    .name = "xgene-enet",
1670                    .of_match_table = of_match_ptr(xgene_enet_of_match),
1671                    .acpi_match_table = ACPI_PTR(xgene_enet_acpi_match),
1672         },
1673         .probe = xgene_enet_probe,
1674         .remove = xgene_enet_remove,
1675 };
1676
1677 module_platform_driver(xgene_enet_driver);
1678
1679 MODULE_DESCRIPTION("APM X-Gene SoC Ethernet driver");
1680 MODULE_VERSION(XGENE_DRV_VERSION);
1681 MODULE_AUTHOR("Iyappan Subramanian <isubramanian@apm.com>");
1682 MODULE_AUTHOR("Keyur Chudgar <kchudgar@apm.com>");
1683 MODULE_LICENSE("GPL");