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