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 <linux/gpio.h> 23 #include "xgene_enet_main.h" 24 #include "xgene_enet_hw.h" 25 #include "xgene_enet_sgmac.h" 26 #include "xgene_enet_xgmac.h" 27 28 #define RES_ENET_CSR 0 29 #define RES_RING_CSR 1 30 #define RES_RING_CMD 2 31 32 static const struct of_device_id xgene_enet_of_match[]; 33 static const struct acpi_device_id xgene_enet_acpi_match[]; 34 35 static void xgene_enet_init_bufpool(struct xgene_enet_desc_ring *buf_pool) 36 { 37 struct xgene_enet_raw_desc16 *raw_desc; 38 int i; 39 40 for (i = 0; i < buf_pool->slots; i++) { 41 raw_desc = &buf_pool->raw_desc16[i]; 42 43 /* Hardware expects descriptor in little endian format */ 44 raw_desc->m0 = cpu_to_le64(i | 45 SET_VAL(FPQNUM, buf_pool->dst_ring_num) | 46 SET_VAL(STASH, 3)); 47 } 48 } 49 50 static int xgene_enet_refill_bufpool(struct xgene_enet_desc_ring *buf_pool, 51 u32 nbuf) 52 { 53 struct sk_buff *skb; 54 struct xgene_enet_raw_desc16 *raw_desc; 55 struct xgene_enet_pdata *pdata; 56 struct net_device *ndev; 57 struct device *dev; 58 dma_addr_t dma_addr; 59 u32 tail = buf_pool->tail; 60 u32 slots = buf_pool->slots - 1; 61 u16 bufdatalen, len; 62 int i; 63 64 ndev = buf_pool->ndev; 65 dev = ndev_to_dev(buf_pool->ndev); 66 pdata = netdev_priv(ndev); 67 bufdatalen = BUF_LEN_CODE_2K | (SKB_BUFFER_SIZE & GENMASK(11, 0)); 68 len = XGENE_ENET_MAX_MTU; 69 70 for (i = 0; i < nbuf; i++) { 71 raw_desc = &buf_pool->raw_desc16[tail]; 72 73 skb = netdev_alloc_skb_ip_align(ndev, len); 74 if (unlikely(!skb)) 75 return -ENOMEM; 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 buf_pool->rx_skb[tail] = skb; 85 86 raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) | 87 SET_VAL(BUFDATALEN, bufdatalen) | 88 SET_BIT(COHERENT)); 89 tail = (tail + 1) & slots; 90 } 91 92 pdata->ring_ops->wr_cmd(buf_pool, nbuf); 93 buf_pool->tail = tail; 94 95 return 0; 96 } 97 98 static u8 xgene_enet_hdr_len(const void *data) 99 { 100 const struct ethhdr *eth = data; 101 102 return (eth->h_proto == htons(ETH_P_8021Q)) ? VLAN_ETH_HLEN : ETH_HLEN; 103 } 104 105 static void xgene_enet_delete_bufpool(struct xgene_enet_desc_ring *buf_pool) 106 { 107 struct device *dev = ndev_to_dev(buf_pool->ndev); 108 struct xgene_enet_raw_desc16 *raw_desc; 109 dma_addr_t dma_addr; 110 int i; 111 112 /* Free up the buffers held by hardware */ 113 for (i = 0; i < buf_pool->slots; i++) { 114 if (buf_pool->rx_skb[i]) { 115 dev_kfree_skb_any(buf_pool->rx_skb[i]); 116 117 raw_desc = &buf_pool->raw_desc16[i]; 118 dma_addr = GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)); 119 dma_unmap_single(dev, dma_addr, XGENE_ENET_MAX_MTU, 120 DMA_FROM_DEVICE); 121 } 122 } 123 } 124 125 static irqreturn_t xgene_enet_rx_irq(const int irq, void *data) 126 { 127 struct xgene_enet_desc_ring *rx_ring = data; 128 129 if (napi_schedule_prep(&rx_ring->napi)) { 130 disable_irq_nosync(irq); 131 __napi_schedule(&rx_ring->napi); 132 } 133 134 return IRQ_HANDLED; 135 } 136 137 static int xgene_enet_tx_completion(struct xgene_enet_desc_ring *cp_ring, 138 struct xgene_enet_raw_desc *raw_desc) 139 { 140 struct xgene_enet_pdata *pdata = netdev_priv(cp_ring->ndev); 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 u8 mss_index; 149 150 skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0)); 151 skb = cp_ring->cp_skb[skb_index]; 152 frag_dma_addr = &cp_ring->frag_dma_addr[skb_index * MAX_SKB_FRAGS]; 153 154 dev = ndev_to_dev(cp_ring->ndev); 155 dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)), 156 skb_headlen(skb), 157 DMA_TO_DEVICE); 158 159 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 160 frag = &skb_shinfo(skb)->frags[i]; 161 dma_unmap_page(dev, frag_dma_addr[i], skb_frag_size(frag), 162 DMA_TO_DEVICE); 163 } 164 165 if (GET_BIT(ET, le64_to_cpu(raw_desc->m3))) { 166 mss_index = GET_VAL(MSS, le64_to_cpu(raw_desc->m3)); 167 spin_lock(&pdata->mss_lock); 168 pdata->mss_refcnt[mss_index]--; 169 spin_unlock(&pdata->mss_lock); 170 } 171 172 /* Checking for error */ 173 status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0)); 174 if (unlikely(status > 2)) { 175 xgene_enet_parse_error(cp_ring, netdev_priv(cp_ring->ndev), 176 status); 177 ret = -EIO; 178 } 179 180 if (likely(skb)) { 181 dev_kfree_skb_any(skb); 182 } else { 183 netdev_err(cp_ring->ndev, "completion skb is NULL\n"); 184 ret = -EIO; 185 } 186 187 return ret; 188 } 189 190 static int xgene_enet_setup_mss(struct net_device *ndev, u32 mss) 191 { 192 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 193 bool mss_index_found = false; 194 int mss_index; 195 int i; 196 197 spin_lock(&pdata->mss_lock); 198 199 /* Reuse the slot if MSS matches */ 200 for (i = 0; !mss_index_found && i < NUM_MSS_REG; i++) { 201 if (pdata->mss[i] == mss) { 202 pdata->mss_refcnt[i]++; 203 mss_index = i; 204 mss_index_found = true; 205 } 206 } 207 208 /* Overwrite the slot with ref_count = 0 */ 209 for (i = 0; !mss_index_found && i < NUM_MSS_REG; i++) { 210 if (!pdata->mss_refcnt[i]) { 211 pdata->mss_refcnt[i]++; 212 pdata->mac_ops->set_mss(pdata, mss, i); 213 pdata->mss[i] = mss; 214 mss_index = i; 215 mss_index_found = true; 216 } 217 } 218 219 spin_unlock(&pdata->mss_lock); 220 221 /* No slots with ref_count = 0 available, return busy */ 222 if (!mss_index_found) 223 return -EBUSY; 224 225 return mss_index; 226 } 227 228 static int xgene_enet_work_msg(struct sk_buff *skb, u64 *hopinfo) 229 { 230 struct net_device *ndev = skb->dev; 231 struct iphdr *iph; 232 u8 l3hlen = 0, l4hlen = 0; 233 u8 ethhdr, proto = 0, csum_enable = 0; 234 u32 hdr_len, mss = 0; 235 u32 i, len, nr_frags; 236 int mss_index; 237 238 ethhdr = xgene_enet_hdr_len(skb->data); 239 240 if (unlikely(skb->protocol != htons(ETH_P_IP)) && 241 unlikely(skb->protocol != htons(ETH_P_8021Q))) 242 goto out; 243 244 if (unlikely(!(skb->dev->features & NETIF_F_IP_CSUM))) 245 goto out; 246 247 iph = ip_hdr(skb); 248 if (unlikely(ip_is_fragment(iph))) 249 goto out; 250 251 if (likely(iph->protocol == IPPROTO_TCP)) { 252 l4hlen = tcp_hdrlen(skb) >> 2; 253 csum_enable = 1; 254 proto = TSO_IPPROTO_TCP; 255 if (ndev->features & NETIF_F_TSO) { 256 hdr_len = ethhdr + ip_hdrlen(skb) + tcp_hdrlen(skb); 257 mss = skb_shinfo(skb)->gso_size; 258 259 if (skb_is_nonlinear(skb)) { 260 len = skb_headlen(skb); 261 nr_frags = skb_shinfo(skb)->nr_frags; 262 263 for (i = 0; i < 2 && i < nr_frags; i++) 264 len += skb_shinfo(skb)->frags[i].size; 265 266 /* HW requires header must reside in 3 buffer */ 267 if (unlikely(hdr_len > len)) { 268 if (skb_linearize(skb)) 269 return 0; 270 } 271 } 272 273 if (!mss || ((skb->len - hdr_len) <= mss)) 274 goto out; 275 276 mss_index = xgene_enet_setup_mss(ndev, mss); 277 if (unlikely(mss_index < 0)) 278 return -EBUSY; 279 280 *hopinfo |= SET_BIT(ET) | SET_VAL(MSS, mss_index); 281 } 282 } else if (iph->protocol == IPPROTO_UDP) { 283 l4hlen = UDP_HDR_SIZE; 284 csum_enable = 1; 285 } 286 out: 287 l3hlen = ip_hdrlen(skb) >> 2; 288 *hopinfo |= SET_VAL(TCPHDR, l4hlen) | 289 SET_VAL(IPHDR, l3hlen) | 290 SET_VAL(ETHHDR, ethhdr) | 291 SET_VAL(EC, csum_enable) | 292 SET_VAL(IS, proto) | 293 SET_BIT(IC) | 294 SET_BIT(TYPE_ETH_WORK_MESSAGE); 295 296 return 0; 297 } 298 299 static u16 xgene_enet_encode_len(u16 len) 300 { 301 return (len == BUFLEN_16K) ? 0 : len; 302 } 303 304 static void xgene_set_addr_len(__le64 *desc, u32 idx, dma_addr_t addr, u32 len) 305 { 306 desc[idx ^ 1] = cpu_to_le64(SET_VAL(DATAADDR, addr) | 307 SET_VAL(BUFDATALEN, len)); 308 } 309 310 static __le64 *xgene_enet_get_exp_bufs(struct xgene_enet_desc_ring *ring) 311 { 312 __le64 *exp_bufs; 313 314 exp_bufs = &ring->exp_bufs[ring->exp_buf_tail * MAX_EXP_BUFFS]; 315 memset(exp_bufs, 0, sizeof(__le64) * MAX_EXP_BUFFS); 316 ring->exp_buf_tail = (ring->exp_buf_tail + 1) & ((ring->slots / 2) - 1); 317 318 return exp_bufs; 319 } 320 321 static dma_addr_t *xgene_get_frag_dma_array(struct xgene_enet_desc_ring *ring) 322 { 323 return &ring->cp_ring->frag_dma_addr[ring->tail * MAX_SKB_FRAGS]; 324 } 325 326 static int xgene_enet_setup_tx_desc(struct xgene_enet_desc_ring *tx_ring, 327 struct sk_buff *skb) 328 { 329 struct device *dev = ndev_to_dev(tx_ring->ndev); 330 struct xgene_enet_pdata *pdata = netdev_priv(tx_ring->ndev); 331 struct xgene_enet_raw_desc *raw_desc; 332 __le64 *exp_desc = NULL, *exp_bufs = NULL; 333 dma_addr_t dma_addr, pbuf_addr, *frag_dma_addr; 334 skb_frag_t *frag; 335 u16 tail = tx_ring->tail; 336 u64 hopinfo = 0; 337 u32 len, hw_len; 338 u8 ll = 0, nv = 0, idx = 0; 339 bool split = false; 340 u32 size, offset, ell_bytes = 0; 341 u32 i, fidx, nr_frags, count = 1; 342 int ret; 343 344 raw_desc = &tx_ring->raw_desc[tail]; 345 tail = (tail + 1) & (tx_ring->slots - 1); 346 memset(raw_desc, 0, sizeof(struct xgene_enet_raw_desc)); 347 348 ret = xgene_enet_work_msg(skb, &hopinfo); 349 if (ret) 350 return ret; 351 352 raw_desc->m3 = cpu_to_le64(SET_VAL(HENQNUM, tx_ring->dst_ring_num) | 353 hopinfo); 354 355 len = skb_headlen(skb); 356 hw_len = xgene_enet_encode_len(len); 357 358 dma_addr = dma_map_single(dev, skb->data, len, DMA_TO_DEVICE); 359 if (dma_mapping_error(dev, dma_addr)) { 360 netdev_err(tx_ring->ndev, "DMA mapping error\n"); 361 return -EINVAL; 362 } 363 364 /* Hardware expects descriptor in little endian format */ 365 raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) | 366 SET_VAL(BUFDATALEN, hw_len) | 367 SET_BIT(COHERENT)); 368 369 if (!skb_is_nonlinear(skb)) 370 goto out; 371 372 /* scatter gather */ 373 nv = 1; 374 exp_desc = (void *)&tx_ring->raw_desc[tail]; 375 tail = (tail + 1) & (tx_ring->slots - 1); 376 memset(exp_desc, 0, sizeof(struct xgene_enet_raw_desc)); 377 378 nr_frags = skb_shinfo(skb)->nr_frags; 379 for (i = nr_frags; i < 4 ; i++) 380 exp_desc[i ^ 1] = cpu_to_le64(LAST_BUFFER); 381 382 frag_dma_addr = xgene_get_frag_dma_array(tx_ring); 383 384 for (i = 0, fidx = 0; split || (fidx < nr_frags); i++) { 385 if (!split) { 386 frag = &skb_shinfo(skb)->frags[fidx]; 387 size = skb_frag_size(frag); 388 offset = 0; 389 390 pbuf_addr = skb_frag_dma_map(dev, frag, 0, size, 391 DMA_TO_DEVICE); 392 if (dma_mapping_error(dev, pbuf_addr)) 393 return -EINVAL; 394 395 frag_dma_addr[fidx] = pbuf_addr; 396 fidx++; 397 398 if (size > BUFLEN_16K) 399 split = true; 400 } 401 402 if (size > BUFLEN_16K) { 403 len = BUFLEN_16K; 404 size -= BUFLEN_16K; 405 } else { 406 len = size; 407 split = false; 408 } 409 410 dma_addr = pbuf_addr + offset; 411 hw_len = xgene_enet_encode_len(len); 412 413 switch (i) { 414 case 0: 415 case 1: 416 case 2: 417 xgene_set_addr_len(exp_desc, i, dma_addr, hw_len); 418 break; 419 case 3: 420 if (split || (fidx != nr_frags)) { 421 exp_bufs = xgene_enet_get_exp_bufs(tx_ring); 422 xgene_set_addr_len(exp_bufs, idx, dma_addr, 423 hw_len); 424 idx++; 425 ell_bytes += len; 426 } else { 427 xgene_set_addr_len(exp_desc, i, dma_addr, 428 hw_len); 429 } 430 break; 431 default: 432 xgene_set_addr_len(exp_bufs, idx, dma_addr, hw_len); 433 idx++; 434 ell_bytes += len; 435 break; 436 } 437 438 if (split) 439 offset += BUFLEN_16K; 440 } 441 count++; 442 443 if (idx) { 444 ll = 1; 445 dma_addr = dma_map_single(dev, exp_bufs, 446 sizeof(u64) * MAX_EXP_BUFFS, 447 DMA_TO_DEVICE); 448 if (dma_mapping_error(dev, dma_addr)) { 449 dev_kfree_skb_any(skb); 450 return -EINVAL; 451 } 452 i = ell_bytes >> LL_BYTES_LSB_LEN; 453 exp_desc[2] = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) | 454 SET_VAL(LL_BYTES_MSB, i) | 455 SET_VAL(LL_LEN, idx)); 456 raw_desc->m2 = cpu_to_le64(SET_VAL(LL_BYTES_LSB, ell_bytes)); 457 } 458 459 out: 460 raw_desc->m0 = cpu_to_le64(SET_VAL(LL, ll) | SET_VAL(NV, nv) | 461 SET_VAL(USERINFO, tx_ring->tail)); 462 tx_ring->cp_ring->cp_skb[tx_ring->tail] = skb; 463 pdata->tx_level[tx_ring->cp_ring->index] += count; 464 tx_ring->tail = tail; 465 466 return count; 467 } 468 469 static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb, 470 struct net_device *ndev) 471 { 472 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 473 struct xgene_enet_desc_ring *tx_ring; 474 int index = skb->queue_mapping; 475 u32 tx_level = pdata->tx_level[index]; 476 int count; 477 478 tx_ring = pdata->tx_ring[index]; 479 if (tx_level < pdata->txc_level[index]) 480 tx_level += ((typeof(pdata->tx_level[index]))~0U); 481 482 if ((tx_level - pdata->txc_level[index]) > pdata->tx_qcnt_hi) { 483 netif_stop_subqueue(ndev, index); 484 return NETDEV_TX_BUSY; 485 } 486 487 if (skb_padto(skb, XGENE_MIN_ENET_FRAME_SIZE)) 488 return NETDEV_TX_OK; 489 490 count = xgene_enet_setup_tx_desc(tx_ring, skb); 491 if (count == -EBUSY) 492 return NETDEV_TX_BUSY; 493 494 if (count <= 0) { 495 dev_kfree_skb_any(skb); 496 return NETDEV_TX_OK; 497 } 498 499 skb_tx_timestamp(skb); 500 501 tx_ring->tx_packets++; 502 tx_ring->tx_bytes += skb->len; 503 504 pdata->ring_ops->wr_cmd(tx_ring, count); 505 return NETDEV_TX_OK; 506 } 507 508 static void xgene_enet_skip_csum(struct sk_buff *skb) 509 { 510 struct iphdr *iph = ip_hdr(skb); 511 512 if (!ip_is_fragment(iph) || 513 (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP)) { 514 skb->ip_summed = CHECKSUM_UNNECESSARY; 515 } 516 } 517 518 static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring, 519 struct xgene_enet_raw_desc *raw_desc) 520 { 521 struct net_device *ndev; 522 struct device *dev; 523 struct xgene_enet_desc_ring *buf_pool; 524 u32 datalen, skb_index; 525 struct sk_buff *skb; 526 u8 status; 527 int ret = 0; 528 529 ndev = rx_ring->ndev; 530 dev = ndev_to_dev(rx_ring->ndev); 531 buf_pool = rx_ring->buf_pool; 532 533 dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)), 534 XGENE_ENET_MAX_MTU, DMA_FROM_DEVICE); 535 skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0)); 536 skb = buf_pool->rx_skb[skb_index]; 537 buf_pool->rx_skb[skb_index] = NULL; 538 539 /* checking for error */ 540 status = (GET_VAL(ELERR, le64_to_cpu(raw_desc->m0)) << LERR_LEN) || 541 GET_VAL(LERR, le64_to_cpu(raw_desc->m0)); 542 if (unlikely(status > 2)) { 543 dev_kfree_skb_any(skb); 544 xgene_enet_parse_error(rx_ring, netdev_priv(rx_ring->ndev), 545 status); 546 ret = -EIO; 547 goto out; 548 } 549 550 /* strip off CRC as HW isn't doing this */ 551 datalen = GET_VAL(BUFDATALEN, le64_to_cpu(raw_desc->m1)); 552 datalen = (datalen & DATALEN_MASK) - 4; 553 prefetch(skb->data - NET_IP_ALIGN); 554 skb_put(skb, datalen); 555 556 skb_checksum_none_assert(skb); 557 skb->protocol = eth_type_trans(skb, ndev); 558 if (likely((ndev->features & NETIF_F_IP_CSUM) && 559 skb->protocol == htons(ETH_P_IP))) { 560 xgene_enet_skip_csum(skb); 561 } 562 563 rx_ring->rx_packets++; 564 rx_ring->rx_bytes += datalen; 565 napi_gro_receive(&rx_ring->napi, skb); 566 out: 567 if (--rx_ring->nbufpool == 0) { 568 ret = xgene_enet_refill_bufpool(buf_pool, NUM_BUFPOOL); 569 rx_ring->nbufpool = NUM_BUFPOOL; 570 } 571 572 return ret; 573 } 574 575 static bool is_rx_desc(struct xgene_enet_raw_desc *raw_desc) 576 { 577 return GET_VAL(FPQNUM, le64_to_cpu(raw_desc->m0)) ? true : false; 578 } 579 580 static int xgene_enet_process_ring(struct xgene_enet_desc_ring *ring, 581 int budget) 582 { 583 struct net_device *ndev = ring->ndev; 584 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 585 struct xgene_enet_raw_desc *raw_desc, *exp_desc; 586 u16 head = ring->head; 587 u16 slots = ring->slots - 1; 588 int ret, desc_count, count = 0, processed = 0; 589 bool is_completion; 590 591 do { 592 raw_desc = &ring->raw_desc[head]; 593 desc_count = 0; 594 is_completion = false; 595 exp_desc = NULL; 596 if (unlikely(xgene_enet_is_desc_slot_empty(raw_desc))) 597 break; 598 599 /* read fpqnum field after dataaddr field */ 600 dma_rmb(); 601 if (GET_BIT(NV, le64_to_cpu(raw_desc->m0))) { 602 head = (head + 1) & slots; 603 exp_desc = &ring->raw_desc[head]; 604 605 if (unlikely(xgene_enet_is_desc_slot_empty(exp_desc))) { 606 head = (head - 1) & slots; 607 break; 608 } 609 dma_rmb(); 610 count++; 611 desc_count++; 612 } 613 if (is_rx_desc(raw_desc)) { 614 ret = xgene_enet_rx_frame(ring, raw_desc); 615 } else { 616 ret = xgene_enet_tx_completion(ring, raw_desc); 617 is_completion = true; 618 } 619 xgene_enet_mark_desc_slot_empty(raw_desc); 620 if (exp_desc) 621 xgene_enet_mark_desc_slot_empty(exp_desc); 622 623 head = (head + 1) & slots; 624 count++; 625 desc_count++; 626 processed++; 627 if (is_completion) 628 pdata->txc_level[ring->index] += desc_count; 629 630 if (ret) 631 break; 632 } while (--budget); 633 634 if (likely(count)) { 635 pdata->ring_ops->wr_cmd(ring, -count); 636 ring->head = head; 637 638 if (__netif_subqueue_stopped(ndev, ring->index)) 639 netif_start_subqueue(ndev, ring->index); 640 } 641 642 return processed; 643 } 644 645 static int xgene_enet_napi(struct napi_struct *napi, const int budget) 646 { 647 struct xgene_enet_desc_ring *ring; 648 int processed; 649 650 ring = container_of(napi, struct xgene_enet_desc_ring, napi); 651 processed = xgene_enet_process_ring(ring, budget); 652 653 if (processed != budget) { 654 napi_complete(napi); 655 enable_irq(ring->irq); 656 } 657 658 return processed; 659 } 660 661 static void xgene_enet_timeout(struct net_device *ndev) 662 { 663 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 664 struct netdev_queue *txq; 665 int i; 666 667 pdata->mac_ops->reset(pdata); 668 669 for (i = 0; i < pdata->txq_cnt; i++) { 670 txq = netdev_get_tx_queue(ndev, i); 671 txq->trans_start = jiffies; 672 netif_tx_start_queue(txq); 673 } 674 } 675 676 static void xgene_enet_set_irq_name(struct net_device *ndev) 677 { 678 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 679 struct xgene_enet_desc_ring *ring; 680 int i; 681 682 for (i = 0; i < pdata->rxq_cnt; i++) { 683 ring = pdata->rx_ring[i]; 684 if (!pdata->cq_cnt) { 685 snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-rx-txc", 686 ndev->name); 687 } else { 688 snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-rx-%d", 689 ndev->name, i); 690 } 691 } 692 693 for (i = 0; i < pdata->cq_cnt; i++) { 694 ring = pdata->tx_ring[i]->cp_ring; 695 snprintf(ring->irq_name, IRQ_ID_SIZE, "%s-txc-%d", 696 ndev->name, i); 697 } 698 } 699 700 static int xgene_enet_register_irq(struct net_device *ndev) 701 { 702 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 703 struct device *dev = ndev_to_dev(ndev); 704 struct xgene_enet_desc_ring *ring; 705 int ret = 0, i; 706 707 xgene_enet_set_irq_name(ndev); 708 for (i = 0; i < pdata->rxq_cnt; i++) { 709 ring = pdata->rx_ring[i]; 710 irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY); 711 ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq, 712 0, ring->irq_name, ring); 713 if (ret) { 714 netdev_err(ndev, "Failed to request irq %s\n", 715 ring->irq_name); 716 } 717 } 718 719 for (i = 0; i < pdata->cq_cnt; i++) { 720 ring = pdata->tx_ring[i]->cp_ring; 721 irq_set_status_flags(ring->irq, IRQ_DISABLE_UNLAZY); 722 ret = devm_request_irq(dev, ring->irq, xgene_enet_rx_irq, 723 0, ring->irq_name, ring); 724 if (ret) { 725 netdev_err(ndev, "Failed to request irq %s\n", 726 ring->irq_name); 727 } 728 } 729 730 return ret; 731 } 732 733 static void xgene_enet_free_irq(struct net_device *ndev) 734 { 735 struct xgene_enet_pdata *pdata; 736 struct xgene_enet_desc_ring *ring; 737 struct device *dev; 738 int i; 739 740 pdata = netdev_priv(ndev); 741 dev = ndev_to_dev(ndev); 742 743 for (i = 0; i < pdata->rxq_cnt; i++) { 744 ring = pdata->rx_ring[i]; 745 irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY); 746 devm_free_irq(dev, ring->irq, ring); 747 } 748 749 for (i = 0; i < pdata->cq_cnt; i++) { 750 ring = pdata->tx_ring[i]->cp_ring; 751 irq_clear_status_flags(ring->irq, IRQ_DISABLE_UNLAZY); 752 devm_free_irq(dev, ring->irq, ring); 753 } 754 } 755 756 static void xgene_enet_napi_enable(struct xgene_enet_pdata *pdata) 757 { 758 struct napi_struct *napi; 759 int i; 760 761 for (i = 0; i < pdata->rxq_cnt; i++) { 762 napi = &pdata->rx_ring[i]->napi; 763 napi_enable(napi); 764 } 765 766 for (i = 0; i < pdata->cq_cnt; i++) { 767 napi = &pdata->tx_ring[i]->cp_ring->napi; 768 napi_enable(napi); 769 } 770 } 771 772 static void xgene_enet_napi_disable(struct xgene_enet_pdata *pdata) 773 { 774 struct napi_struct *napi; 775 int i; 776 777 for (i = 0; i < pdata->rxq_cnt; i++) { 778 napi = &pdata->rx_ring[i]->napi; 779 napi_disable(napi); 780 } 781 782 for (i = 0; i < pdata->cq_cnt; i++) { 783 napi = &pdata->tx_ring[i]->cp_ring->napi; 784 napi_disable(napi); 785 } 786 } 787 788 static int xgene_enet_open(struct net_device *ndev) 789 { 790 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 791 const struct xgene_mac_ops *mac_ops = pdata->mac_ops; 792 int ret; 793 794 ret = netif_set_real_num_tx_queues(ndev, pdata->txq_cnt); 795 if (ret) 796 return ret; 797 798 ret = netif_set_real_num_rx_queues(ndev, pdata->rxq_cnt); 799 if (ret) 800 return ret; 801 802 xgene_enet_napi_enable(pdata); 803 ret = xgene_enet_register_irq(ndev); 804 if (ret) 805 return ret; 806 807 if (ndev->phydev) { 808 phy_start(ndev->phydev); 809 } else { 810 schedule_delayed_work(&pdata->link_work, PHY_POLL_LINK_OFF); 811 netif_carrier_off(ndev); 812 } 813 814 mac_ops->tx_enable(pdata); 815 mac_ops->rx_enable(pdata); 816 netif_tx_start_all_queues(ndev); 817 818 return ret; 819 } 820 821 static int xgene_enet_close(struct net_device *ndev) 822 { 823 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 824 const struct xgene_mac_ops *mac_ops = pdata->mac_ops; 825 int i; 826 827 netif_tx_stop_all_queues(ndev); 828 mac_ops->tx_disable(pdata); 829 mac_ops->rx_disable(pdata); 830 831 if (ndev->phydev) 832 phy_stop(ndev->phydev); 833 else 834 cancel_delayed_work_sync(&pdata->link_work); 835 836 xgene_enet_free_irq(ndev); 837 xgene_enet_napi_disable(pdata); 838 for (i = 0; i < pdata->rxq_cnt; i++) 839 xgene_enet_process_ring(pdata->rx_ring[i], -1); 840 841 return 0; 842 } 843 static void xgene_enet_delete_ring(struct xgene_enet_desc_ring *ring) 844 { 845 struct xgene_enet_pdata *pdata; 846 struct device *dev; 847 848 pdata = netdev_priv(ring->ndev); 849 dev = ndev_to_dev(ring->ndev); 850 851 pdata->ring_ops->clear(ring); 852 dmam_free_coherent(dev, ring->size, ring->desc_addr, ring->dma); 853 } 854 855 static void xgene_enet_delete_desc_rings(struct xgene_enet_pdata *pdata) 856 { 857 struct xgene_enet_desc_ring *buf_pool; 858 struct xgene_enet_desc_ring *ring; 859 int i; 860 861 for (i = 0; i < pdata->txq_cnt; i++) { 862 ring = pdata->tx_ring[i]; 863 if (ring) { 864 xgene_enet_delete_ring(ring); 865 pdata->port_ops->clear(pdata, ring); 866 if (pdata->cq_cnt) 867 xgene_enet_delete_ring(ring->cp_ring); 868 pdata->tx_ring[i] = NULL; 869 } 870 } 871 872 for (i = 0; i < pdata->rxq_cnt; i++) { 873 ring = pdata->rx_ring[i]; 874 if (ring) { 875 buf_pool = ring->buf_pool; 876 xgene_enet_delete_bufpool(buf_pool); 877 xgene_enet_delete_ring(buf_pool); 878 pdata->port_ops->clear(pdata, buf_pool); 879 xgene_enet_delete_ring(ring); 880 pdata->rx_ring[i] = NULL; 881 } 882 } 883 } 884 885 static int xgene_enet_get_ring_size(struct device *dev, 886 enum xgene_enet_ring_cfgsize cfgsize) 887 { 888 int size = -EINVAL; 889 890 switch (cfgsize) { 891 case RING_CFGSIZE_512B: 892 size = 0x200; 893 break; 894 case RING_CFGSIZE_2KB: 895 size = 0x800; 896 break; 897 case RING_CFGSIZE_16KB: 898 size = 0x4000; 899 break; 900 case RING_CFGSIZE_64KB: 901 size = 0x10000; 902 break; 903 case RING_CFGSIZE_512KB: 904 size = 0x80000; 905 break; 906 default: 907 dev_err(dev, "Unsupported cfg ring size %d\n", cfgsize); 908 break; 909 } 910 911 return size; 912 } 913 914 static void xgene_enet_free_desc_ring(struct xgene_enet_desc_ring *ring) 915 { 916 struct xgene_enet_pdata *pdata; 917 struct device *dev; 918 919 if (!ring) 920 return; 921 922 dev = ndev_to_dev(ring->ndev); 923 pdata = netdev_priv(ring->ndev); 924 925 if (ring->desc_addr) { 926 pdata->ring_ops->clear(ring); 927 dmam_free_coherent(dev, ring->size, ring->desc_addr, ring->dma); 928 } 929 devm_kfree(dev, ring); 930 } 931 932 static void xgene_enet_free_desc_rings(struct xgene_enet_pdata *pdata) 933 { 934 struct device *dev = &pdata->pdev->dev; 935 struct xgene_enet_desc_ring *ring; 936 int i; 937 938 for (i = 0; i < pdata->txq_cnt; i++) { 939 ring = pdata->tx_ring[i]; 940 if (ring) { 941 if (ring->cp_ring && ring->cp_ring->cp_skb) 942 devm_kfree(dev, ring->cp_ring->cp_skb); 943 if (ring->cp_ring && pdata->cq_cnt) 944 xgene_enet_free_desc_ring(ring->cp_ring); 945 xgene_enet_free_desc_ring(ring); 946 } 947 } 948 949 for (i = 0; i < pdata->rxq_cnt; i++) { 950 ring = pdata->rx_ring[i]; 951 if (ring) { 952 if (ring->buf_pool) { 953 if (ring->buf_pool->rx_skb) 954 devm_kfree(dev, ring->buf_pool->rx_skb); 955 xgene_enet_free_desc_ring(ring->buf_pool); 956 } 957 xgene_enet_free_desc_ring(ring); 958 } 959 } 960 } 961 962 static bool is_irq_mbox_required(struct xgene_enet_pdata *pdata, 963 struct xgene_enet_desc_ring *ring) 964 { 965 if ((pdata->enet_id == XGENE_ENET2) && 966 (xgene_enet_ring_owner(ring->id) == RING_OWNER_CPU)) { 967 return true; 968 } 969 970 return false; 971 } 972 973 static void __iomem *xgene_enet_ring_cmd_base(struct xgene_enet_pdata *pdata, 974 struct xgene_enet_desc_ring *ring) 975 { 976 u8 num_ring_id_shift = pdata->ring_ops->num_ring_id_shift; 977 978 return pdata->ring_cmd_addr + (ring->num << num_ring_id_shift); 979 } 980 981 static struct xgene_enet_desc_ring *xgene_enet_create_desc_ring( 982 struct net_device *ndev, u32 ring_num, 983 enum xgene_enet_ring_cfgsize cfgsize, u32 ring_id) 984 { 985 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 986 struct device *dev = ndev_to_dev(ndev); 987 struct xgene_enet_desc_ring *ring; 988 void *irq_mbox_addr; 989 int size; 990 991 size = xgene_enet_get_ring_size(dev, cfgsize); 992 if (size < 0) 993 return NULL; 994 995 ring = devm_kzalloc(dev, sizeof(struct xgene_enet_desc_ring), 996 GFP_KERNEL); 997 if (!ring) 998 return NULL; 999 1000 ring->ndev = ndev; 1001 ring->num = ring_num; 1002 ring->cfgsize = cfgsize; 1003 ring->id = ring_id; 1004 1005 ring->desc_addr = dmam_alloc_coherent(dev, size, &ring->dma, 1006 GFP_KERNEL | __GFP_ZERO); 1007 if (!ring->desc_addr) { 1008 devm_kfree(dev, ring); 1009 return NULL; 1010 } 1011 ring->size = size; 1012 1013 if (is_irq_mbox_required(pdata, ring)) { 1014 irq_mbox_addr = dmam_alloc_coherent(dev, INTR_MBOX_SIZE, 1015 &ring->irq_mbox_dma, 1016 GFP_KERNEL | __GFP_ZERO); 1017 if (!irq_mbox_addr) { 1018 dmam_free_coherent(dev, size, ring->desc_addr, 1019 ring->dma); 1020 devm_kfree(dev, ring); 1021 return NULL; 1022 } 1023 ring->irq_mbox_addr = irq_mbox_addr; 1024 } 1025 1026 ring->cmd_base = xgene_enet_ring_cmd_base(pdata, ring); 1027 ring->cmd = ring->cmd_base + INC_DEC_CMD_ADDR; 1028 ring = pdata->ring_ops->setup(ring); 1029 netdev_dbg(ndev, "ring info: num=%d size=%d id=%d slots=%d\n", 1030 ring->num, ring->size, ring->id, ring->slots); 1031 1032 return ring; 1033 } 1034 1035 static u16 xgene_enet_get_ring_id(enum xgene_ring_owner owner, u8 bufnum) 1036 { 1037 return (owner << 6) | (bufnum & GENMASK(5, 0)); 1038 } 1039 1040 static enum xgene_ring_owner xgene_derive_ring_owner(struct xgene_enet_pdata *p) 1041 { 1042 enum xgene_ring_owner owner; 1043 1044 if (p->enet_id == XGENE_ENET1) { 1045 switch (p->phy_mode) { 1046 case PHY_INTERFACE_MODE_SGMII: 1047 owner = RING_OWNER_ETH0; 1048 break; 1049 default: 1050 owner = (!p->port_id) ? RING_OWNER_ETH0 : 1051 RING_OWNER_ETH1; 1052 break; 1053 } 1054 } else { 1055 owner = (!p->port_id) ? RING_OWNER_ETH0 : RING_OWNER_ETH1; 1056 } 1057 1058 return owner; 1059 } 1060 1061 static u8 xgene_start_cpu_bufnum(struct xgene_enet_pdata *pdata) 1062 { 1063 struct device *dev = &pdata->pdev->dev; 1064 u32 cpu_bufnum; 1065 int ret; 1066 1067 ret = device_property_read_u32(dev, "channel", &cpu_bufnum); 1068 1069 return (!ret) ? cpu_bufnum : pdata->cpu_bufnum; 1070 } 1071 1072 static int xgene_enet_create_desc_rings(struct net_device *ndev) 1073 { 1074 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 1075 struct device *dev = ndev_to_dev(ndev); 1076 struct xgene_enet_desc_ring *rx_ring, *tx_ring, *cp_ring; 1077 struct xgene_enet_desc_ring *buf_pool = NULL; 1078 enum xgene_ring_owner owner; 1079 dma_addr_t dma_exp_bufs; 1080 u8 cpu_bufnum; 1081 u8 eth_bufnum = pdata->eth_bufnum; 1082 u8 bp_bufnum = pdata->bp_bufnum; 1083 u16 ring_num = pdata->ring_num; 1084 __le64 *exp_bufs; 1085 u16 ring_id; 1086 int i, ret, size; 1087 1088 cpu_bufnum = xgene_start_cpu_bufnum(pdata); 1089 1090 for (i = 0; i < pdata->rxq_cnt; i++) { 1091 /* allocate rx descriptor ring */ 1092 owner = xgene_derive_ring_owner(pdata); 1093 ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, cpu_bufnum++); 1094 rx_ring = xgene_enet_create_desc_ring(ndev, ring_num++, 1095 RING_CFGSIZE_16KB, 1096 ring_id); 1097 if (!rx_ring) { 1098 ret = -ENOMEM; 1099 goto err; 1100 } 1101 1102 /* allocate buffer pool for receiving packets */ 1103 owner = xgene_derive_ring_owner(pdata); 1104 ring_id = xgene_enet_get_ring_id(owner, bp_bufnum++); 1105 buf_pool = xgene_enet_create_desc_ring(ndev, ring_num++, 1106 RING_CFGSIZE_2KB, 1107 ring_id); 1108 if (!buf_pool) { 1109 ret = -ENOMEM; 1110 goto err; 1111 } 1112 1113 rx_ring->nbufpool = NUM_BUFPOOL; 1114 rx_ring->buf_pool = buf_pool; 1115 rx_ring->irq = pdata->irqs[i]; 1116 buf_pool->rx_skb = devm_kcalloc(dev, buf_pool->slots, 1117 sizeof(struct sk_buff *), 1118 GFP_KERNEL); 1119 if (!buf_pool->rx_skb) { 1120 ret = -ENOMEM; 1121 goto err; 1122 } 1123 1124 buf_pool->dst_ring_num = xgene_enet_dst_ring_num(buf_pool); 1125 rx_ring->buf_pool = buf_pool; 1126 pdata->rx_ring[i] = rx_ring; 1127 } 1128 1129 for (i = 0; i < pdata->txq_cnt; i++) { 1130 /* allocate tx descriptor ring */ 1131 owner = xgene_derive_ring_owner(pdata); 1132 ring_id = xgene_enet_get_ring_id(owner, eth_bufnum++); 1133 tx_ring = xgene_enet_create_desc_ring(ndev, ring_num++, 1134 RING_CFGSIZE_16KB, 1135 ring_id); 1136 if (!tx_ring) { 1137 ret = -ENOMEM; 1138 goto err; 1139 } 1140 1141 size = (tx_ring->slots / 2) * sizeof(__le64) * MAX_EXP_BUFFS; 1142 exp_bufs = dmam_alloc_coherent(dev, size, &dma_exp_bufs, 1143 GFP_KERNEL | __GFP_ZERO); 1144 if (!exp_bufs) { 1145 ret = -ENOMEM; 1146 goto err; 1147 } 1148 tx_ring->exp_bufs = exp_bufs; 1149 1150 pdata->tx_ring[i] = tx_ring; 1151 1152 if (!pdata->cq_cnt) { 1153 cp_ring = pdata->rx_ring[i]; 1154 } else { 1155 /* allocate tx completion descriptor ring */ 1156 ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, 1157 cpu_bufnum++); 1158 cp_ring = xgene_enet_create_desc_ring(ndev, ring_num++, 1159 RING_CFGSIZE_16KB, 1160 ring_id); 1161 if (!cp_ring) { 1162 ret = -ENOMEM; 1163 goto err; 1164 } 1165 1166 cp_ring->irq = pdata->irqs[pdata->rxq_cnt + i]; 1167 cp_ring->index = i; 1168 } 1169 1170 cp_ring->cp_skb = devm_kcalloc(dev, tx_ring->slots, 1171 sizeof(struct sk_buff *), 1172 GFP_KERNEL); 1173 if (!cp_ring->cp_skb) { 1174 ret = -ENOMEM; 1175 goto err; 1176 } 1177 1178 size = sizeof(dma_addr_t) * MAX_SKB_FRAGS; 1179 cp_ring->frag_dma_addr = devm_kcalloc(dev, tx_ring->slots, 1180 size, GFP_KERNEL); 1181 if (!cp_ring->frag_dma_addr) { 1182 devm_kfree(dev, cp_ring->cp_skb); 1183 ret = -ENOMEM; 1184 goto err; 1185 } 1186 1187 tx_ring->cp_ring = cp_ring; 1188 tx_ring->dst_ring_num = xgene_enet_dst_ring_num(cp_ring); 1189 } 1190 1191 pdata->ring_ops->coalesce(pdata->tx_ring[0]); 1192 pdata->tx_qcnt_hi = pdata->tx_ring[0]->slots - 128; 1193 1194 return 0; 1195 1196 err: 1197 xgene_enet_free_desc_rings(pdata); 1198 return ret; 1199 } 1200 1201 static struct rtnl_link_stats64 *xgene_enet_get_stats64( 1202 struct net_device *ndev, 1203 struct rtnl_link_stats64 *storage) 1204 { 1205 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 1206 struct rtnl_link_stats64 *stats = &pdata->stats; 1207 struct xgene_enet_desc_ring *ring; 1208 int i; 1209 1210 memset(stats, 0, sizeof(struct rtnl_link_stats64)); 1211 for (i = 0; i < pdata->txq_cnt; i++) { 1212 ring = pdata->tx_ring[i]; 1213 if (ring) { 1214 stats->tx_packets += ring->tx_packets; 1215 stats->tx_bytes += ring->tx_bytes; 1216 } 1217 } 1218 1219 for (i = 0; i < pdata->rxq_cnt; i++) { 1220 ring = pdata->rx_ring[i]; 1221 if (ring) { 1222 stats->rx_packets += ring->rx_packets; 1223 stats->rx_bytes += ring->rx_bytes; 1224 stats->rx_errors += ring->rx_length_errors + 1225 ring->rx_crc_errors + 1226 ring->rx_frame_errors + 1227 ring->rx_fifo_errors; 1228 stats->rx_dropped += ring->rx_dropped; 1229 } 1230 } 1231 memcpy(storage, stats, sizeof(struct rtnl_link_stats64)); 1232 1233 return storage; 1234 } 1235 1236 static int xgene_enet_set_mac_address(struct net_device *ndev, void *addr) 1237 { 1238 struct xgene_enet_pdata *pdata = netdev_priv(ndev); 1239 int ret; 1240 1241 ret = eth_mac_addr(ndev, addr); 1242 if (ret) 1243 return ret; 1244 pdata->mac_ops->set_mac_addr(pdata); 1245 1246 return ret; 1247 } 1248 1249 static const struct net_device_ops xgene_ndev_ops = { 1250 .ndo_open = xgene_enet_open, 1251 .ndo_stop = xgene_enet_close, 1252 .ndo_start_xmit = xgene_enet_start_xmit, 1253 .ndo_tx_timeout = xgene_enet_timeout, 1254 .ndo_get_stats64 = xgene_enet_get_stats64, 1255 .ndo_set_mac_address = xgene_enet_set_mac_address, 1256 }; 1257 1258 #ifdef CONFIG_ACPI 1259 static void xgene_get_port_id_acpi(struct device *dev, 1260 struct xgene_enet_pdata *pdata) 1261 { 1262 acpi_status status; 1263 u64 temp; 1264 1265 status = acpi_evaluate_integer(ACPI_HANDLE(dev), "_SUN", NULL, &temp); 1266 if (ACPI_FAILURE(status)) { 1267 pdata->port_id = 0; 1268 } else { 1269 pdata->port_id = temp; 1270 } 1271 1272 return; 1273 } 1274 #endif 1275 1276 static void xgene_get_port_id_dt(struct device *dev, struct xgene_enet_pdata *pdata) 1277 { 1278 u32 id = 0; 1279 1280 of_property_read_u32(dev->of_node, "port-id", &id); 1281 1282 pdata->port_id = id & BIT(0); 1283 1284 return; 1285 } 1286 1287 static int xgene_get_tx_delay(struct xgene_enet_pdata *pdata) 1288 { 1289 struct device *dev = &pdata->pdev->dev; 1290 int delay, ret; 1291 1292 ret = of_property_read_u32(dev->of_node, "tx-delay", &delay); 1293 if (ret) { 1294 pdata->tx_delay = 4; 1295 return 0; 1296 } 1297 1298 if (delay < 0 || delay > 7) { 1299 dev_err(dev, "Invalid tx-delay specified\n"); 1300 return -EINVAL; 1301 } 1302 1303 pdata->tx_delay = delay; 1304 1305 return 0; 1306 } 1307 1308 static int xgene_get_rx_delay(struct xgene_enet_pdata *pdata) 1309 { 1310 struct device *dev = &pdata->pdev->dev; 1311 int delay, ret; 1312 1313 ret = of_property_read_u32(dev->of_node, "rx-delay", &delay); 1314 if (ret) { 1315 pdata->rx_delay = 2; 1316 return 0; 1317 } 1318 1319 if (delay < 0 || delay > 7) { 1320 dev_err(dev, "Invalid rx-delay specified\n"); 1321 return -EINVAL; 1322 } 1323 1324 pdata->rx_delay = delay; 1325 1326 return 0; 1327 } 1328 1329 static int xgene_enet_get_irqs(struct xgene_enet_pdata *pdata) 1330 { 1331 struct platform_device *pdev = pdata->pdev; 1332 struct device *dev = &pdev->dev; 1333 int i, ret, max_irqs; 1334 1335 if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII) 1336 max_irqs = 1; 1337 else if (pdata->phy_mode == PHY_INTERFACE_MODE_SGMII) 1338 max_irqs = 2; 1339 else 1340 max_irqs = XGENE_MAX_ENET_IRQ; 1341 1342 for (i = 0; i < max_irqs; i++) { 1343 ret = platform_get_irq(pdev, i); 1344 if (ret <= 0) { 1345 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { 1346 max_irqs = i; 1347 pdata->rxq_cnt = max_irqs / 2; 1348 pdata->txq_cnt = max_irqs / 2; 1349 pdata->cq_cnt = max_irqs / 2; 1350 break; 1351 } 1352 dev_err(dev, "Unable to get ENET IRQ\n"); 1353 ret = ret ? : -ENXIO; 1354 return ret; 1355 } 1356 pdata->irqs[i] = ret; 1357 } 1358 1359 return 0; 1360 } 1361 1362 static int xgene_enet_check_phy_handle(struct xgene_enet_pdata *pdata) 1363 { 1364 int ret; 1365 1366 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) 1367 return 0; 1368 1369 if (!IS_ENABLED(CONFIG_MDIO_XGENE)) 1370 return 0; 1371 1372 ret = xgene_enet_phy_connect(pdata->ndev); 1373 if (!ret) 1374 pdata->mdio_driver = true; 1375 1376 return 0; 1377 } 1378 1379 static void xgene_enet_gpiod_get(struct xgene_enet_pdata *pdata) 1380 { 1381 struct device *dev = &pdata->pdev->dev; 1382 1383 pdata->sfp_gpio_en = false; 1384 if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII || 1385 (!device_property_present(dev, "sfp-gpios") && 1386 !device_property_present(dev, "rxlos-gpios"))) 1387 return; 1388 1389 pdata->sfp_gpio_en = true; 1390 pdata->sfp_rdy = gpiod_get(dev, "rxlos", GPIOD_IN); 1391 if (IS_ERR(pdata->sfp_rdy)) 1392 pdata->sfp_rdy = gpiod_get(dev, "sfp", GPIOD_IN); 1393 } 1394 1395 static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata) 1396 { 1397 struct platform_device *pdev; 1398 struct net_device *ndev; 1399 struct device *dev; 1400 struct resource *res; 1401 void __iomem *base_addr; 1402 u32 offset; 1403 int ret = 0; 1404 1405 pdev = pdata->pdev; 1406 dev = &pdev->dev; 1407 ndev = pdata->ndev; 1408 1409 res = platform_get_resource(pdev, IORESOURCE_MEM, RES_ENET_CSR); 1410 if (!res) { 1411 dev_err(dev, "Resource enet_csr not defined\n"); 1412 return -ENODEV; 1413 } 1414 pdata->base_addr = devm_ioremap(dev, res->start, resource_size(res)); 1415 if (!pdata->base_addr) { 1416 dev_err(dev, "Unable to retrieve ENET Port CSR region\n"); 1417 return -ENOMEM; 1418 } 1419 1420 res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CSR); 1421 if (!res) { 1422 dev_err(dev, "Resource ring_csr not defined\n"); 1423 return -ENODEV; 1424 } 1425 pdata->ring_csr_addr = devm_ioremap(dev, res->start, 1426 resource_size(res)); 1427 if (!pdata->ring_csr_addr) { 1428 dev_err(dev, "Unable to retrieve ENET Ring CSR region\n"); 1429 return -ENOMEM; 1430 } 1431 1432 res = platform_get_resource(pdev, IORESOURCE_MEM, RES_RING_CMD); 1433 if (!res) { 1434 dev_err(dev, "Resource ring_cmd not defined\n"); 1435 return -ENODEV; 1436 } 1437 pdata->ring_cmd_addr = devm_ioremap(dev, res->start, 1438 resource_size(res)); 1439 if (!pdata->ring_cmd_addr) { 1440 dev_err(dev, "Unable to retrieve ENET Ring command region\n"); 1441 return -ENOMEM; 1442 } 1443 1444 if (dev->of_node) 1445 xgene_get_port_id_dt(dev, pdata); 1446 #ifdef CONFIG_ACPI 1447 else 1448 xgene_get_port_id_acpi(dev, pdata); 1449 #endif 1450 1451 if (!device_get_mac_address(dev, ndev->dev_addr, ETH_ALEN)) 1452 eth_hw_addr_random(ndev); 1453 1454 memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len); 1455 1456 pdata->phy_mode = device_get_phy_mode(dev); 1457 if (pdata->phy_mode < 0) { 1458 dev_err(dev, "Unable to get phy-connection-type\n"); 1459 return pdata->phy_mode; 1460 } 1461 if (pdata->phy_mode != PHY_INTERFACE_MODE_RGMII && 1462 pdata->phy_mode != PHY_INTERFACE_MODE_SGMII && 1463 pdata->phy_mode != PHY_INTERFACE_MODE_XGMII) { 1464 dev_err(dev, "Incorrect phy-connection-type specified\n"); 1465 return -ENODEV; 1466 } 1467 1468 ret = xgene_get_tx_delay(pdata); 1469 if (ret) 1470 return ret; 1471 1472 ret = xgene_get_rx_delay(pdata); 1473 if (ret) 1474 return ret; 1475 1476 ret = xgene_enet_get_irqs(pdata); 1477 if (ret) 1478 return ret; 1479 1480 ret = xgene_enet_check_phy_handle(pdata); 1481 if (ret) 1482 return ret; 1483 1484 xgene_enet_gpiod_get(pdata); 1485 1486 pdata->clk = devm_clk_get(&pdev->dev, NULL); 1487 if (IS_ERR(pdata->clk)) { 1488 /* Firmware may have set up the clock already. */ 1489 dev_info(dev, "clocks have been setup already\n"); 1490 } 1491 1492 if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII) 1493 base_addr = pdata->base_addr - (pdata->port_id * MAC_OFFSET); 1494 else 1495 base_addr = pdata->base_addr; 1496 pdata->eth_csr_addr = base_addr + BLOCK_ETH_CSR_OFFSET; 1497 pdata->cle.base = base_addr + BLOCK_ETH_CLE_CSR_OFFSET; 1498 pdata->eth_ring_if_addr = base_addr + BLOCK_ETH_RING_IF_OFFSET; 1499 pdata->eth_diag_csr_addr = base_addr + BLOCK_ETH_DIAG_CSR_OFFSET; 1500 if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII || 1501 pdata->phy_mode == PHY_INTERFACE_MODE_SGMII) { 1502 pdata->mcx_mac_addr = pdata->base_addr + BLOCK_ETH_MAC_OFFSET; 1503 offset = (pdata->enet_id == XGENE_ENET1) ? 1504 BLOCK_ETH_MAC_CSR_OFFSET : 1505 X2_BLOCK_ETH_MAC_CSR_OFFSET; 1506 pdata->mcx_mac_csr_addr = base_addr + offset; 1507 } else { 1508 pdata->mcx_mac_addr = base_addr + BLOCK_AXG_MAC_OFFSET; 1509 pdata->mcx_mac_csr_addr = base_addr + BLOCK_AXG_MAC_CSR_OFFSET; 1510 pdata->pcs_addr = base_addr + BLOCK_PCS_OFFSET; 1511 } 1512 pdata->rx_buff_cnt = NUM_PKT_BUF; 1513 1514 return 0; 1515 } 1516 1517 static int xgene_enet_init_hw(struct xgene_enet_pdata *pdata) 1518 { 1519 struct xgene_enet_cle *enet_cle = &pdata->cle; 1520 struct net_device *ndev = pdata->ndev; 1521 struct xgene_enet_desc_ring *buf_pool; 1522 u16 dst_ring_num; 1523 int i, ret; 1524 1525 ret = pdata->port_ops->reset(pdata); 1526 if (ret) 1527 return ret; 1528 1529 ret = xgene_enet_create_desc_rings(ndev); 1530 if (ret) { 1531 netdev_err(ndev, "Error in ring configuration\n"); 1532 return ret; 1533 } 1534 1535 /* setup buffer pool */ 1536 for (i = 0; i < pdata->rxq_cnt; i++) { 1537 buf_pool = pdata->rx_ring[i]->buf_pool; 1538 xgene_enet_init_bufpool(buf_pool); 1539 ret = xgene_enet_refill_bufpool(buf_pool, pdata->rx_buff_cnt); 1540 if (ret) 1541 goto err; 1542 } 1543 1544 dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring[0]); 1545 buf_pool = pdata->rx_ring[0]->buf_pool; 1546 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { 1547 /* Initialize and Enable PreClassifier Tree */ 1548 enet_cle->max_nodes = 512; 1549 enet_cle->max_dbptrs = 1024; 1550 enet_cle->parsers = 3; 1551 enet_cle->active_parser = PARSER_ALL; 1552 enet_cle->ptree.start_node = 0; 1553 enet_cle->ptree.start_dbptr = 0; 1554 enet_cle->jump_bytes = 8; 1555 ret = pdata->cle_ops->cle_init(pdata); 1556 if (ret) { 1557 netdev_err(ndev, "Preclass Tree init error\n"); 1558 goto err; 1559 } 1560 } else { 1561 pdata->port_ops->cle_bypass(pdata, dst_ring_num, buf_pool->id); 1562 } 1563 1564 pdata->phy_speed = SPEED_UNKNOWN; 1565 pdata->mac_ops->init(pdata); 1566 1567 return ret; 1568 1569 err: 1570 xgene_enet_delete_desc_rings(pdata); 1571 return ret; 1572 } 1573 1574 static void xgene_enet_setup_ops(struct xgene_enet_pdata *pdata) 1575 { 1576 switch (pdata->phy_mode) { 1577 case PHY_INTERFACE_MODE_RGMII: 1578 pdata->mac_ops = &xgene_gmac_ops; 1579 pdata->port_ops = &xgene_gport_ops; 1580 pdata->rm = RM3; 1581 pdata->rxq_cnt = 1; 1582 pdata->txq_cnt = 1; 1583 pdata->cq_cnt = 0; 1584 break; 1585 case PHY_INTERFACE_MODE_SGMII: 1586 pdata->mac_ops = &xgene_sgmac_ops; 1587 pdata->port_ops = &xgene_sgport_ops; 1588 pdata->rm = RM1; 1589 pdata->rxq_cnt = 1; 1590 pdata->txq_cnt = 1; 1591 pdata->cq_cnt = 1; 1592 break; 1593 default: 1594 pdata->mac_ops = &xgene_xgmac_ops; 1595 pdata->port_ops = &xgene_xgport_ops; 1596 pdata->cle_ops = &xgene_cle3in_ops; 1597 pdata->rm = RM0; 1598 if (!pdata->rxq_cnt) { 1599 pdata->rxq_cnt = XGENE_NUM_RX_RING; 1600 pdata->txq_cnt = XGENE_NUM_TX_RING; 1601 pdata->cq_cnt = XGENE_NUM_TXC_RING; 1602 } 1603 break; 1604 } 1605 1606 if (pdata->enet_id == XGENE_ENET1) { 1607 switch (pdata->port_id) { 1608 case 0: 1609 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { 1610 pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0; 1611 pdata->eth_bufnum = X2_START_ETH_BUFNUM_0; 1612 pdata->bp_bufnum = X2_START_BP_BUFNUM_0; 1613 pdata->ring_num = START_RING_NUM_0; 1614 } else { 1615 pdata->cpu_bufnum = START_CPU_BUFNUM_0; 1616 pdata->eth_bufnum = START_ETH_BUFNUM_0; 1617 pdata->bp_bufnum = START_BP_BUFNUM_0; 1618 pdata->ring_num = START_RING_NUM_0; 1619 } 1620 break; 1621 case 1: 1622 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { 1623 pdata->cpu_bufnum = XG_START_CPU_BUFNUM_1; 1624 pdata->eth_bufnum = XG_START_ETH_BUFNUM_1; 1625 pdata->bp_bufnum = XG_START_BP_BUFNUM_1; 1626 pdata->ring_num = XG_START_RING_NUM_1; 1627 } else { 1628 pdata->cpu_bufnum = START_CPU_BUFNUM_1; 1629 pdata->eth_bufnum = START_ETH_BUFNUM_1; 1630 pdata->bp_bufnum = START_BP_BUFNUM_1; 1631 pdata->ring_num = START_RING_NUM_1; 1632 } 1633 break; 1634 default: 1635 break; 1636 } 1637 pdata->ring_ops = &xgene_ring1_ops; 1638 } else { 1639 switch (pdata->port_id) { 1640 case 0: 1641 pdata->cpu_bufnum = X2_START_CPU_BUFNUM_0; 1642 pdata->eth_bufnum = X2_START_ETH_BUFNUM_0; 1643 pdata->bp_bufnum = X2_START_BP_BUFNUM_0; 1644 pdata->ring_num = X2_START_RING_NUM_0; 1645 break; 1646 case 1: 1647 pdata->cpu_bufnum = X2_START_CPU_BUFNUM_1; 1648 pdata->eth_bufnum = X2_START_ETH_BUFNUM_1; 1649 pdata->bp_bufnum = X2_START_BP_BUFNUM_1; 1650 pdata->ring_num = X2_START_RING_NUM_1; 1651 break; 1652 default: 1653 break; 1654 } 1655 pdata->rm = RM0; 1656 pdata->ring_ops = &xgene_ring2_ops; 1657 } 1658 } 1659 1660 static void xgene_enet_napi_add(struct xgene_enet_pdata *pdata) 1661 { 1662 struct napi_struct *napi; 1663 int i; 1664 1665 for (i = 0; i < pdata->rxq_cnt; i++) { 1666 napi = &pdata->rx_ring[i]->napi; 1667 netif_napi_add(pdata->ndev, napi, xgene_enet_napi, 1668 NAPI_POLL_WEIGHT); 1669 } 1670 1671 for (i = 0; i < pdata->cq_cnt; i++) { 1672 napi = &pdata->tx_ring[i]->cp_ring->napi; 1673 netif_napi_add(pdata->ndev, napi, xgene_enet_napi, 1674 NAPI_POLL_WEIGHT); 1675 } 1676 } 1677 1678 static int xgene_enet_probe(struct platform_device *pdev) 1679 { 1680 struct net_device *ndev; 1681 struct xgene_enet_pdata *pdata; 1682 struct device *dev = &pdev->dev; 1683 void (*link_state)(struct work_struct *); 1684 const struct of_device_id *of_id; 1685 int ret; 1686 1687 ndev = alloc_etherdev_mqs(sizeof(struct xgene_enet_pdata), 1688 XGENE_NUM_RX_RING, XGENE_NUM_TX_RING); 1689 if (!ndev) 1690 return -ENOMEM; 1691 1692 pdata = netdev_priv(ndev); 1693 1694 pdata->pdev = pdev; 1695 pdata->ndev = ndev; 1696 SET_NETDEV_DEV(ndev, dev); 1697 platform_set_drvdata(pdev, pdata); 1698 ndev->netdev_ops = &xgene_ndev_ops; 1699 xgene_enet_set_ethtool_ops(ndev); 1700 ndev->features |= NETIF_F_IP_CSUM | 1701 NETIF_F_GSO | 1702 NETIF_F_GRO | 1703 NETIF_F_SG; 1704 1705 of_id = of_match_device(xgene_enet_of_match, &pdev->dev); 1706 if (of_id) { 1707 pdata->enet_id = (enum xgene_enet_id)of_id->data; 1708 } 1709 #ifdef CONFIG_ACPI 1710 else { 1711 const struct acpi_device_id *acpi_id; 1712 1713 acpi_id = acpi_match_device(xgene_enet_acpi_match, &pdev->dev); 1714 if (acpi_id) 1715 pdata->enet_id = (enum xgene_enet_id) acpi_id->driver_data; 1716 } 1717 #endif 1718 if (!pdata->enet_id) { 1719 ret = -ENODEV; 1720 goto err; 1721 } 1722 1723 ret = xgene_enet_get_resources(pdata); 1724 if (ret) 1725 goto err; 1726 1727 xgene_enet_setup_ops(pdata); 1728 1729 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { 1730 ndev->features |= NETIF_F_TSO; 1731 spin_lock_init(&pdata->mss_lock); 1732 } 1733 ndev->hw_features = ndev->features; 1734 1735 ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64)); 1736 if (ret) { 1737 netdev_err(ndev, "No usable DMA configuration\n"); 1738 goto err; 1739 } 1740 1741 ret = xgene_enet_init_hw(pdata); 1742 if (ret) 1743 goto err; 1744 1745 link_state = pdata->mac_ops->link_state; 1746 if (pdata->phy_mode == PHY_INTERFACE_MODE_XGMII) { 1747 INIT_DELAYED_WORK(&pdata->link_work, link_state); 1748 } else if (!pdata->mdio_driver) { 1749 if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII) 1750 ret = xgene_enet_mdio_config(pdata); 1751 else 1752 INIT_DELAYED_WORK(&pdata->link_work, link_state); 1753 1754 if (ret) 1755 goto err1; 1756 } 1757 1758 xgene_enet_napi_add(pdata); 1759 ret = register_netdev(ndev); 1760 if (ret) { 1761 netdev_err(ndev, "Failed to register netdev\n"); 1762 goto err2; 1763 } 1764 1765 return 0; 1766 1767 err2: 1768 /* 1769 * If necessary, free_netdev() will call netif_napi_del() and undo 1770 * the effects of xgene_enet_napi_add()'s calls to netif_napi_add(). 1771 */ 1772 1773 if (pdata->mdio_driver) 1774 xgene_enet_phy_disconnect(pdata); 1775 else if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII) 1776 xgene_enet_mdio_remove(pdata); 1777 err1: 1778 xgene_enet_delete_desc_rings(pdata); 1779 err: 1780 free_netdev(ndev); 1781 return ret; 1782 } 1783 1784 static int xgene_enet_remove(struct platform_device *pdev) 1785 { 1786 struct xgene_enet_pdata *pdata; 1787 struct net_device *ndev; 1788 1789 pdata = platform_get_drvdata(pdev); 1790 ndev = pdata->ndev; 1791 1792 rtnl_lock(); 1793 if (netif_running(ndev)) 1794 dev_close(ndev); 1795 rtnl_unlock(); 1796 1797 if (pdata->mdio_driver) 1798 xgene_enet_phy_disconnect(pdata); 1799 else if (pdata->phy_mode == PHY_INTERFACE_MODE_RGMII) 1800 xgene_enet_mdio_remove(pdata); 1801 1802 unregister_netdev(ndev); 1803 pdata->port_ops->shutdown(pdata); 1804 xgene_enet_delete_desc_rings(pdata); 1805 free_netdev(ndev); 1806 1807 return 0; 1808 } 1809 1810 static void xgene_enet_shutdown(struct platform_device *pdev) 1811 { 1812 struct xgene_enet_pdata *pdata; 1813 1814 pdata = platform_get_drvdata(pdev); 1815 if (!pdata) 1816 return; 1817 1818 if (!pdata->ndev) 1819 return; 1820 1821 xgene_enet_remove(pdev); 1822 } 1823 1824 #ifdef CONFIG_ACPI 1825 static const struct acpi_device_id xgene_enet_acpi_match[] = { 1826 { "APMC0D05", XGENE_ENET1}, 1827 { "APMC0D30", XGENE_ENET1}, 1828 { "APMC0D31", XGENE_ENET1}, 1829 { "APMC0D3F", XGENE_ENET1}, 1830 { "APMC0D26", XGENE_ENET2}, 1831 { "APMC0D25", XGENE_ENET2}, 1832 { } 1833 }; 1834 MODULE_DEVICE_TABLE(acpi, xgene_enet_acpi_match); 1835 #endif 1836 1837 #ifdef CONFIG_OF 1838 static const struct of_device_id xgene_enet_of_match[] = { 1839 {.compatible = "apm,xgene-enet", .data = (void *)XGENE_ENET1}, 1840 {.compatible = "apm,xgene1-sgenet", .data = (void *)XGENE_ENET1}, 1841 {.compatible = "apm,xgene1-xgenet", .data = (void *)XGENE_ENET1}, 1842 {.compatible = "apm,xgene2-sgenet", .data = (void *)XGENE_ENET2}, 1843 {.compatible = "apm,xgene2-xgenet", .data = (void *)XGENE_ENET2}, 1844 {}, 1845 }; 1846 1847 MODULE_DEVICE_TABLE(of, xgene_enet_of_match); 1848 #endif 1849 1850 static struct platform_driver xgene_enet_driver = { 1851 .driver = { 1852 .name = "xgene-enet", 1853 .of_match_table = of_match_ptr(xgene_enet_of_match), 1854 .acpi_match_table = ACPI_PTR(xgene_enet_acpi_match), 1855 }, 1856 .probe = xgene_enet_probe, 1857 .remove = xgene_enet_remove, 1858 .shutdown = xgene_enet_shutdown, 1859 }; 1860 1861 module_platform_driver(xgene_enet_driver); 1862 1863 MODULE_DESCRIPTION("APM X-Gene SoC Ethernet driver"); 1864 MODULE_VERSION(XGENE_DRV_VERSION); 1865 MODULE_AUTHOR("Iyappan Subramanian <isubramanian@apm.com>"); 1866 MODULE_AUTHOR("Keyur Chudgar <kchudgar@apm.com>"); 1867 MODULE_LICENSE("GPL"); 1868