1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Actions Semi Owl SoCs Ethernet MAC driver 4 * 5 * Copyright (c) 2012 Actions Semi Inc. 6 * Copyright (c) 2021 Cristian Ciocaltea <cristian.ciocaltea@gmail.com> 7 */ 8 9 #include <linux/circ_buf.h> 10 #include <linux/clk.h> 11 #include <linux/dma-mapping.h> 12 #include <linux/etherdevice.h> 13 #include <linux/of_mdio.h> 14 #include <linux/of_net.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm.h> 17 #include <linux/reset.h> 18 19 #include "owl-emac.h" 20 21 #define OWL_EMAC_DEFAULT_MSG_ENABLE (NETIF_MSG_DRV | \ 22 NETIF_MSG_PROBE | \ 23 NETIF_MSG_LINK) 24 25 static u32 owl_emac_reg_read(struct owl_emac_priv *priv, u32 reg) 26 { 27 return readl(priv->base + reg); 28 } 29 30 static void owl_emac_reg_write(struct owl_emac_priv *priv, u32 reg, u32 data) 31 { 32 writel(data, priv->base + reg); 33 } 34 35 static u32 owl_emac_reg_update(struct owl_emac_priv *priv, 36 u32 reg, u32 mask, u32 val) 37 { 38 u32 data, old_val; 39 40 data = owl_emac_reg_read(priv, reg); 41 old_val = data & mask; 42 43 data &= ~mask; 44 data |= val & mask; 45 46 owl_emac_reg_write(priv, reg, data); 47 48 return old_val; 49 } 50 51 static void owl_emac_reg_set(struct owl_emac_priv *priv, u32 reg, u32 bits) 52 { 53 owl_emac_reg_update(priv, reg, bits, bits); 54 } 55 56 static void owl_emac_reg_clear(struct owl_emac_priv *priv, u32 reg, u32 bits) 57 { 58 owl_emac_reg_update(priv, reg, bits, 0); 59 } 60 61 static struct device *owl_emac_get_dev(struct owl_emac_priv *priv) 62 { 63 return priv->netdev->dev.parent; 64 } 65 66 static void owl_emac_irq_enable(struct owl_emac_priv *priv) 67 { 68 /* Enable all interrupts except TU. 69 * 70 * Note the NIE and AIE bits shall also be set in order to actually 71 * enable the selected interrupts. 72 */ 73 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR7, 74 OWL_EMAC_BIT_MAC_CSR7_NIE | 75 OWL_EMAC_BIT_MAC_CSR7_AIE | 76 OWL_EMAC_BIT_MAC_CSR7_ALL_NOT_TUE); 77 } 78 79 static void owl_emac_irq_disable(struct owl_emac_priv *priv) 80 { 81 /* Disable all interrupts. 82 * 83 * WARNING: Unset only the NIE and AIE bits in CSR7 to workaround an 84 * unexpected side effect (MAC hardware bug?!) where some bits in the 85 * status register (CSR5) are cleared automatically before being able 86 * to read them via owl_emac_irq_clear(). 87 */ 88 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR7, 89 OWL_EMAC_BIT_MAC_CSR7_ALL_NOT_TUE); 90 } 91 92 static u32 owl_emac_irq_status(struct owl_emac_priv *priv) 93 { 94 return owl_emac_reg_read(priv, OWL_EMAC_REG_MAC_CSR5); 95 } 96 97 static u32 owl_emac_irq_clear(struct owl_emac_priv *priv) 98 { 99 u32 val = owl_emac_irq_status(priv); 100 101 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR5, val); 102 103 return val; 104 } 105 106 static dma_addr_t owl_emac_dma_map_rx(struct owl_emac_priv *priv, 107 struct sk_buff *skb) 108 { 109 struct device *dev = owl_emac_get_dev(priv); 110 111 /* Buffer pointer for the RX DMA descriptor must be word aligned. */ 112 return dma_map_single(dev, skb_tail_pointer(skb), 113 skb_tailroom(skb), DMA_FROM_DEVICE); 114 } 115 116 static void owl_emac_dma_unmap_rx(struct owl_emac_priv *priv, 117 struct sk_buff *skb, dma_addr_t dma_addr) 118 { 119 struct device *dev = owl_emac_get_dev(priv); 120 121 dma_unmap_single(dev, dma_addr, skb_tailroom(skb), DMA_FROM_DEVICE); 122 } 123 124 static dma_addr_t owl_emac_dma_map_tx(struct owl_emac_priv *priv, 125 struct sk_buff *skb) 126 { 127 struct device *dev = owl_emac_get_dev(priv); 128 129 return dma_map_single(dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE); 130 } 131 132 static void owl_emac_dma_unmap_tx(struct owl_emac_priv *priv, 133 struct sk_buff *skb, dma_addr_t dma_addr) 134 { 135 struct device *dev = owl_emac_get_dev(priv); 136 137 dma_unmap_single(dev, dma_addr, skb_headlen(skb), DMA_TO_DEVICE); 138 } 139 140 static unsigned int owl_emac_ring_num_unused(struct owl_emac_ring *ring) 141 { 142 return CIRC_SPACE(ring->head, ring->tail, ring->size); 143 } 144 145 static unsigned int owl_emac_ring_get_next(struct owl_emac_ring *ring, 146 unsigned int cur) 147 { 148 return (cur + 1) & (ring->size - 1); 149 } 150 151 static void owl_emac_ring_push_head(struct owl_emac_ring *ring) 152 { 153 ring->head = owl_emac_ring_get_next(ring, ring->head); 154 } 155 156 static void owl_emac_ring_pop_tail(struct owl_emac_ring *ring) 157 { 158 ring->tail = owl_emac_ring_get_next(ring, ring->tail); 159 } 160 161 static struct sk_buff *owl_emac_alloc_skb(struct net_device *netdev) 162 { 163 struct sk_buff *skb; 164 int offset; 165 166 skb = netdev_alloc_skb(netdev, OWL_EMAC_RX_FRAME_MAX_LEN + 167 OWL_EMAC_SKB_RESERVE); 168 if (unlikely(!skb)) 169 return NULL; 170 171 /* Ensure 4 bytes DMA alignment. */ 172 offset = ((uintptr_t)skb->data) & (OWL_EMAC_SKB_ALIGN - 1); 173 if (unlikely(offset)) 174 skb_reserve(skb, OWL_EMAC_SKB_ALIGN - offset); 175 176 return skb; 177 } 178 179 static int owl_emac_ring_prepare_rx(struct owl_emac_priv *priv) 180 { 181 struct owl_emac_ring *ring = &priv->rx_ring; 182 struct device *dev = owl_emac_get_dev(priv); 183 struct net_device *netdev = priv->netdev; 184 struct owl_emac_ring_desc *desc; 185 struct sk_buff *skb; 186 dma_addr_t dma_addr; 187 int i; 188 189 for (i = 0; i < ring->size; i++) { 190 skb = owl_emac_alloc_skb(netdev); 191 if (!skb) 192 return -ENOMEM; 193 194 dma_addr = owl_emac_dma_map_rx(priv, skb); 195 if (dma_mapping_error(dev, dma_addr)) { 196 dev_kfree_skb(skb); 197 return -ENOMEM; 198 } 199 200 desc = &ring->descs[i]; 201 desc->status = OWL_EMAC_BIT_RDES0_OWN; 202 desc->control = skb_tailroom(skb) & OWL_EMAC_MSK_RDES1_RBS1; 203 desc->buf_addr = dma_addr; 204 desc->reserved = 0; 205 206 ring->skbs[i] = skb; 207 ring->skbs_dma[i] = dma_addr; 208 } 209 210 desc->control |= OWL_EMAC_BIT_RDES1_RER; 211 212 ring->head = 0; 213 ring->tail = 0; 214 215 return 0; 216 } 217 218 static void owl_emac_ring_prepare_tx(struct owl_emac_priv *priv) 219 { 220 struct owl_emac_ring *ring = &priv->tx_ring; 221 struct owl_emac_ring_desc *desc; 222 int i; 223 224 for (i = 0; i < ring->size; i++) { 225 desc = &ring->descs[i]; 226 227 desc->status = 0; 228 desc->control = OWL_EMAC_BIT_TDES1_IC; 229 desc->buf_addr = 0; 230 desc->reserved = 0; 231 } 232 233 desc->control |= OWL_EMAC_BIT_TDES1_TER; 234 235 memset(ring->skbs_dma, 0, sizeof(dma_addr_t) * ring->size); 236 237 ring->head = 0; 238 ring->tail = 0; 239 } 240 241 static void owl_emac_ring_unprepare_rx(struct owl_emac_priv *priv) 242 { 243 struct owl_emac_ring *ring = &priv->rx_ring; 244 int i; 245 246 for (i = 0; i < ring->size; i++) { 247 ring->descs[i].status = 0; 248 249 if (!ring->skbs_dma[i]) 250 continue; 251 252 owl_emac_dma_unmap_rx(priv, ring->skbs[i], ring->skbs_dma[i]); 253 ring->skbs_dma[i] = 0; 254 255 dev_kfree_skb(ring->skbs[i]); 256 ring->skbs[i] = NULL; 257 } 258 } 259 260 static void owl_emac_ring_unprepare_tx(struct owl_emac_priv *priv) 261 { 262 struct owl_emac_ring *ring = &priv->tx_ring; 263 int i; 264 265 for (i = 0; i < ring->size; i++) { 266 ring->descs[i].status = 0; 267 268 if (!ring->skbs_dma[i]) 269 continue; 270 271 owl_emac_dma_unmap_tx(priv, ring->skbs[i], ring->skbs_dma[i]); 272 ring->skbs_dma[i] = 0; 273 274 dev_kfree_skb(ring->skbs[i]); 275 ring->skbs[i] = NULL; 276 } 277 } 278 279 static int owl_emac_ring_alloc(struct device *dev, struct owl_emac_ring *ring, 280 unsigned int size) 281 { 282 ring->descs = dmam_alloc_coherent(dev, 283 sizeof(struct owl_emac_ring_desc) * size, 284 &ring->descs_dma, GFP_KERNEL); 285 if (!ring->descs) 286 return -ENOMEM; 287 288 ring->skbs = devm_kcalloc(dev, size, sizeof(struct sk_buff *), 289 GFP_KERNEL); 290 if (!ring->skbs) 291 return -ENOMEM; 292 293 ring->skbs_dma = devm_kcalloc(dev, size, sizeof(dma_addr_t), 294 GFP_KERNEL); 295 if (!ring->skbs_dma) 296 return -ENOMEM; 297 298 ring->size = size; 299 300 return 0; 301 } 302 303 static void owl_emac_dma_cmd_resume_rx(struct owl_emac_priv *priv) 304 { 305 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR2, 306 OWL_EMAC_VAL_MAC_CSR2_RPD); 307 } 308 309 static void owl_emac_dma_cmd_resume_tx(struct owl_emac_priv *priv) 310 { 311 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR1, 312 OWL_EMAC_VAL_MAC_CSR1_TPD); 313 } 314 315 static u32 owl_emac_dma_cmd_set_tx(struct owl_emac_priv *priv, u32 status) 316 { 317 return owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, 318 OWL_EMAC_BIT_MAC_CSR6_ST, status); 319 } 320 321 static u32 owl_emac_dma_cmd_start_tx(struct owl_emac_priv *priv) 322 { 323 return owl_emac_dma_cmd_set_tx(priv, ~0); 324 } 325 326 static u32 owl_emac_dma_cmd_set(struct owl_emac_priv *priv, u32 status) 327 { 328 return owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, 329 OWL_EMAC_MSK_MAC_CSR6_STSR, status); 330 } 331 332 static u32 owl_emac_dma_cmd_start(struct owl_emac_priv *priv) 333 { 334 return owl_emac_dma_cmd_set(priv, ~0); 335 } 336 337 static u32 owl_emac_dma_cmd_stop(struct owl_emac_priv *priv) 338 { 339 return owl_emac_dma_cmd_set(priv, 0); 340 } 341 342 static void owl_emac_set_hw_mac_addr(struct net_device *netdev) 343 { 344 struct owl_emac_priv *priv = netdev_priv(netdev); 345 const u8 *mac_addr = netdev->dev_addr; 346 u32 addr_high, addr_low; 347 348 addr_high = mac_addr[0] << 8 | mac_addr[1]; 349 addr_low = mac_addr[2] << 24 | mac_addr[3] << 16 | 350 mac_addr[4] << 8 | mac_addr[5]; 351 352 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR17, addr_high); 353 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR16, addr_low); 354 } 355 356 static void owl_emac_update_link_state(struct owl_emac_priv *priv) 357 { 358 u32 val, status; 359 360 if (priv->pause) { 361 val = OWL_EMAC_BIT_MAC_CSR20_FCE | OWL_EMAC_BIT_MAC_CSR20_TUE; 362 val |= OWL_EMAC_BIT_MAC_CSR20_TPE | OWL_EMAC_BIT_MAC_CSR20_RPE; 363 val |= OWL_EMAC_BIT_MAC_CSR20_BPE; 364 } else { 365 val = 0; 366 } 367 368 /* Update flow control. */ 369 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR20, val); 370 371 val = (priv->speed == SPEED_100) ? OWL_EMAC_VAL_MAC_CSR6_SPEED_100M : 372 OWL_EMAC_VAL_MAC_CSR6_SPEED_10M; 373 val <<= OWL_EMAC_OFF_MAC_CSR6_SPEED; 374 375 if (priv->duplex == DUPLEX_FULL) 376 val |= OWL_EMAC_BIT_MAC_CSR6_FD; 377 378 spin_lock_bh(&priv->lock); 379 380 /* Temporarily stop DMA TX & RX. */ 381 status = owl_emac_dma_cmd_stop(priv); 382 383 /* Update operation modes. */ 384 owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, 385 OWL_EMAC_MSK_MAC_CSR6_SPEED | 386 OWL_EMAC_BIT_MAC_CSR6_FD, val); 387 388 /* Restore DMA TX & RX status. */ 389 owl_emac_dma_cmd_set(priv, status); 390 391 spin_unlock_bh(&priv->lock); 392 } 393 394 static void owl_emac_adjust_link(struct net_device *netdev) 395 { 396 struct owl_emac_priv *priv = netdev_priv(netdev); 397 struct phy_device *phydev = netdev->phydev; 398 bool state_changed = false; 399 400 if (phydev->link) { 401 if (!priv->link) { 402 priv->link = phydev->link; 403 state_changed = true; 404 } 405 406 if (priv->speed != phydev->speed) { 407 priv->speed = phydev->speed; 408 state_changed = true; 409 } 410 411 if (priv->duplex != phydev->duplex) { 412 priv->duplex = phydev->duplex; 413 state_changed = true; 414 } 415 416 if (priv->pause != phydev->pause) { 417 priv->pause = phydev->pause; 418 state_changed = true; 419 } 420 } else { 421 if (priv->link) { 422 priv->link = phydev->link; 423 state_changed = true; 424 } 425 } 426 427 if (state_changed) { 428 if (phydev->link) 429 owl_emac_update_link_state(priv); 430 431 if (netif_msg_link(priv)) 432 phy_print_status(phydev); 433 } 434 } 435 436 static irqreturn_t owl_emac_handle_irq(int irq, void *data) 437 { 438 struct net_device *netdev = data; 439 struct owl_emac_priv *priv = netdev_priv(netdev); 440 441 if (netif_running(netdev)) { 442 owl_emac_irq_disable(priv); 443 napi_schedule(&priv->napi); 444 } 445 446 return IRQ_HANDLED; 447 } 448 449 static void owl_emac_ether_addr_push(u8 **dst, const u8 *src) 450 { 451 u32 *a = (u32 *)(*dst); 452 const u16 *b = (const u16 *)src; 453 454 a[0] = b[0]; 455 a[1] = b[1]; 456 a[2] = b[2]; 457 458 *dst += 12; 459 } 460 461 static void 462 owl_emac_setup_frame_prepare(struct owl_emac_priv *priv, struct sk_buff *skb) 463 { 464 const u8 bcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; 465 const u8 *mac_addr = priv->netdev->dev_addr; 466 u8 *frame; 467 int i; 468 469 skb_put(skb, OWL_EMAC_SETUP_FRAME_LEN); 470 471 frame = skb->data; 472 memset(frame, 0, skb->len); 473 474 owl_emac_ether_addr_push(&frame, mac_addr); 475 owl_emac_ether_addr_push(&frame, bcast_addr); 476 477 /* Fill multicast addresses. */ 478 WARN_ON(priv->mcaddr_list.count >= OWL_EMAC_MAX_MULTICAST_ADDRS); 479 for (i = 0; i < priv->mcaddr_list.count; i++) { 480 mac_addr = priv->mcaddr_list.addrs[i]; 481 owl_emac_ether_addr_push(&frame, mac_addr); 482 } 483 } 484 485 /* The setup frame is a special descriptor which is used to provide physical 486 * addresses (i.e. mac, broadcast and multicast) to the MAC hardware for 487 * filtering purposes. To be recognized as a setup frame, the TDES1_SET bit 488 * must be set in the TX descriptor control field. 489 */ 490 static int owl_emac_setup_frame_xmit(struct owl_emac_priv *priv) 491 { 492 struct owl_emac_ring *ring = &priv->tx_ring; 493 struct net_device *netdev = priv->netdev; 494 struct owl_emac_ring_desc *desc; 495 struct sk_buff *skb; 496 unsigned int tx_head; 497 u32 status, control; 498 dma_addr_t dma_addr; 499 int ret; 500 501 skb = owl_emac_alloc_skb(netdev); 502 if (!skb) 503 return -ENOMEM; 504 505 owl_emac_setup_frame_prepare(priv, skb); 506 507 dma_addr = owl_emac_dma_map_tx(priv, skb); 508 if (dma_mapping_error(owl_emac_get_dev(priv), dma_addr)) { 509 ret = -ENOMEM; 510 goto err_free_skb; 511 } 512 513 spin_lock_bh(&priv->lock); 514 515 tx_head = ring->head; 516 desc = &ring->descs[tx_head]; 517 518 status = READ_ONCE(desc->status); 519 control = READ_ONCE(desc->control); 520 dma_rmb(); /* Ensure data has been read before used. */ 521 522 if (unlikely(status & OWL_EMAC_BIT_TDES0_OWN) || 523 !owl_emac_ring_num_unused(ring)) { 524 spin_unlock_bh(&priv->lock); 525 owl_emac_dma_unmap_tx(priv, skb, dma_addr); 526 ret = -EBUSY; 527 goto err_free_skb; 528 } 529 530 ring->skbs[tx_head] = skb; 531 ring->skbs_dma[tx_head] = dma_addr; 532 533 control &= OWL_EMAC_BIT_TDES1_IC | OWL_EMAC_BIT_TDES1_TER; /* Maintain bits */ 534 control |= OWL_EMAC_BIT_TDES1_SET; 535 control |= OWL_EMAC_MSK_TDES1_TBS1 & skb->len; 536 537 WRITE_ONCE(desc->control, control); 538 WRITE_ONCE(desc->buf_addr, dma_addr); 539 dma_wmb(); /* Flush descriptor before changing ownership. */ 540 WRITE_ONCE(desc->status, OWL_EMAC_BIT_TDES0_OWN); 541 542 owl_emac_ring_push_head(ring); 543 544 /* Temporarily enable DMA TX. */ 545 status = owl_emac_dma_cmd_start_tx(priv); 546 547 /* Trigger setup frame processing. */ 548 owl_emac_dma_cmd_resume_tx(priv); 549 550 /* Restore DMA TX status. */ 551 owl_emac_dma_cmd_set_tx(priv, status); 552 553 /* Stop regular TX until setup frame is processed. */ 554 netif_stop_queue(netdev); 555 556 spin_unlock_bh(&priv->lock); 557 558 return 0; 559 560 err_free_skb: 561 dev_kfree_skb(skb); 562 return ret; 563 } 564 565 static netdev_tx_t owl_emac_ndo_start_xmit(struct sk_buff *skb, 566 struct net_device *netdev) 567 { 568 struct owl_emac_priv *priv = netdev_priv(netdev); 569 struct device *dev = owl_emac_get_dev(priv); 570 struct owl_emac_ring *ring = &priv->tx_ring; 571 struct owl_emac_ring_desc *desc; 572 unsigned int tx_head; 573 u32 status, control; 574 dma_addr_t dma_addr; 575 576 dma_addr = owl_emac_dma_map_tx(priv, skb); 577 if (dma_mapping_error(dev, dma_addr)) { 578 dev_err_ratelimited(&netdev->dev, "TX DMA mapping failed\n"); 579 dev_kfree_skb(skb); 580 netdev->stats.tx_dropped++; 581 return NETDEV_TX_OK; 582 } 583 584 spin_lock_bh(&priv->lock); 585 586 tx_head = ring->head; 587 desc = &ring->descs[tx_head]; 588 589 status = READ_ONCE(desc->status); 590 control = READ_ONCE(desc->control); 591 dma_rmb(); /* Ensure data has been read before used. */ 592 593 if (!owl_emac_ring_num_unused(ring) || 594 unlikely(status & OWL_EMAC_BIT_TDES0_OWN)) { 595 netif_stop_queue(netdev); 596 spin_unlock_bh(&priv->lock); 597 598 dev_dbg_ratelimited(&netdev->dev, "TX buffer full, status=0x%08x\n", 599 owl_emac_irq_status(priv)); 600 owl_emac_dma_unmap_tx(priv, skb, dma_addr); 601 netdev->stats.tx_dropped++; 602 return NETDEV_TX_BUSY; 603 } 604 605 ring->skbs[tx_head] = skb; 606 ring->skbs_dma[tx_head] = dma_addr; 607 608 control &= OWL_EMAC_BIT_TDES1_IC | OWL_EMAC_BIT_TDES1_TER; /* Maintain bits */ 609 control |= OWL_EMAC_BIT_TDES1_FS | OWL_EMAC_BIT_TDES1_LS; 610 control |= OWL_EMAC_MSK_TDES1_TBS1 & skb->len; 611 612 WRITE_ONCE(desc->control, control); 613 WRITE_ONCE(desc->buf_addr, dma_addr); 614 dma_wmb(); /* Flush descriptor before changing ownership. */ 615 WRITE_ONCE(desc->status, OWL_EMAC_BIT_TDES0_OWN); 616 617 owl_emac_dma_cmd_resume_tx(priv); 618 owl_emac_ring_push_head(ring); 619 620 /* FIXME: The transmission is currently restricted to a single frame 621 * at a time as a workaround for a MAC hardware bug that causes random 622 * freeze of the TX queue processor. 623 */ 624 netif_stop_queue(netdev); 625 626 spin_unlock_bh(&priv->lock); 627 628 return NETDEV_TX_OK; 629 } 630 631 static bool owl_emac_tx_complete_tail(struct owl_emac_priv *priv) 632 { 633 struct owl_emac_ring *ring = &priv->tx_ring; 634 struct net_device *netdev = priv->netdev; 635 struct owl_emac_ring_desc *desc; 636 struct sk_buff *skb; 637 unsigned int tx_tail; 638 u32 status; 639 640 tx_tail = ring->tail; 641 desc = &ring->descs[tx_tail]; 642 643 status = READ_ONCE(desc->status); 644 dma_rmb(); /* Ensure data has been read before used. */ 645 646 if (status & OWL_EMAC_BIT_TDES0_OWN) 647 return false; 648 649 /* Check for errors. */ 650 if (status & OWL_EMAC_BIT_TDES0_ES) { 651 dev_dbg_ratelimited(&netdev->dev, 652 "TX complete error status: 0x%08x\n", 653 status); 654 655 netdev->stats.tx_errors++; 656 657 if (status & OWL_EMAC_BIT_TDES0_UF) 658 netdev->stats.tx_fifo_errors++; 659 660 if (status & OWL_EMAC_BIT_TDES0_EC) 661 netdev->stats.tx_aborted_errors++; 662 663 if (status & OWL_EMAC_BIT_TDES0_LC) 664 netdev->stats.tx_window_errors++; 665 666 if (status & OWL_EMAC_BIT_TDES0_NC) 667 netdev->stats.tx_heartbeat_errors++; 668 669 if (status & OWL_EMAC_BIT_TDES0_LO) 670 netdev->stats.tx_carrier_errors++; 671 } else { 672 netdev->stats.tx_packets++; 673 netdev->stats.tx_bytes += ring->skbs[tx_tail]->len; 674 } 675 676 /* Some collisions occurred, but pkt has been transmitted. */ 677 if (status & OWL_EMAC_BIT_TDES0_DE) 678 netdev->stats.collisions++; 679 680 skb = ring->skbs[tx_tail]; 681 owl_emac_dma_unmap_tx(priv, skb, ring->skbs_dma[tx_tail]); 682 dev_kfree_skb(skb); 683 684 ring->skbs[tx_tail] = NULL; 685 ring->skbs_dma[tx_tail] = 0; 686 687 owl_emac_ring_pop_tail(ring); 688 689 if (unlikely(netif_queue_stopped(netdev))) 690 netif_wake_queue(netdev); 691 692 return true; 693 } 694 695 static void owl_emac_tx_complete(struct owl_emac_priv *priv) 696 { 697 struct owl_emac_ring *ring = &priv->tx_ring; 698 struct net_device *netdev = priv->netdev; 699 unsigned int tx_next; 700 u32 status; 701 702 spin_lock(&priv->lock); 703 704 while (ring->tail != ring->head) { 705 if (!owl_emac_tx_complete_tail(priv)) 706 break; 707 } 708 709 /* FIXME: This is a workaround for a MAC hardware bug not clearing 710 * (sometimes) the OWN bit for a transmitted frame descriptor. 711 * 712 * At this point, when TX queue is full, the tail descriptor has the 713 * OWN bit set, which normally means the frame has not been processed 714 * or transmitted yet. But if there is at least one descriptor in the 715 * queue having the OWN bit cleared, we can safely assume the tail 716 * frame has been also processed by the MAC hardware. 717 * 718 * If that's the case, let's force the frame completion by manually 719 * clearing the OWN bit. 720 */ 721 if (unlikely(!owl_emac_ring_num_unused(ring))) { 722 tx_next = ring->tail; 723 724 while ((tx_next = owl_emac_ring_get_next(ring, tx_next)) != ring->head) { 725 status = READ_ONCE(ring->descs[tx_next].status); 726 dma_rmb(); /* Ensure data has been read before used. */ 727 728 if (status & OWL_EMAC_BIT_TDES0_OWN) 729 continue; 730 731 netdev_dbg(netdev, "Found uncleared TX desc OWN bit\n"); 732 733 status = READ_ONCE(ring->descs[ring->tail].status); 734 dma_rmb(); /* Ensure data has been read before used. */ 735 status &= ~OWL_EMAC_BIT_TDES0_OWN; 736 WRITE_ONCE(ring->descs[ring->tail].status, status); 737 738 owl_emac_tx_complete_tail(priv); 739 break; 740 } 741 } 742 743 spin_unlock(&priv->lock); 744 } 745 746 static int owl_emac_rx_process(struct owl_emac_priv *priv, int budget) 747 { 748 struct owl_emac_ring *ring = &priv->rx_ring; 749 struct device *dev = owl_emac_get_dev(priv); 750 struct net_device *netdev = priv->netdev; 751 struct owl_emac_ring_desc *desc; 752 struct sk_buff *curr_skb, *new_skb; 753 dma_addr_t curr_dma, new_dma; 754 unsigned int rx_tail, len; 755 u32 status; 756 int recv = 0; 757 758 while (recv < budget) { 759 spin_lock(&priv->lock); 760 761 rx_tail = ring->tail; 762 desc = &ring->descs[rx_tail]; 763 764 status = READ_ONCE(desc->status); 765 dma_rmb(); /* Ensure data has been read before used. */ 766 767 if (status & OWL_EMAC_BIT_RDES0_OWN) { 768 spin_unlock(&priv->lock); 769 break; 770 } 771 772 curr_skb = ring->skbs[rx_tail]; 773 curr_dma = ring->skbs_dma[rx_tail]; 774 owl_emac_ring_pop_tail(ring); 775 776 spin_unlock(&priv->lock); 777 778 if (status & (OWL_EMAC_BIT_RDES0_DE | OWL_EMAC_BIT_RDES0_RF | 779 OWL_EMAC_BIT_RDES0_TL | OWL_EMAC_BIT_RDES0_CS | 780 OWL_EMAC_BIT_RDES0_DB | OWL_EMAC_BIT_RDES0_CE | 781 OWL_EMAC_BIT_RDES0_ZERO)) { 782 dev_dbg_ratelimited(&netdev->dev, 783 "RX desc error status: 0x%08x\n", 784 status); 785 786 if (status & OWL_EMAC_BIT_RDES0_DE) 787 netdev->stats.rx_over_errors++; 788 789 if (status & (OWL_EMAC_BIT_RDES0_RF | OWL_EMAC_BIT_RDES0_DB)) 790 netdev->stats.rx_frame_errors++; 791 792 if (status & OWL_EMAC_BIT_RDES0_TL) 793 netdev->stats.rx_length_errors++; 794 795 if (status & OWL_EMAC_BIT_RDES0_CS) 796 netdev->stats.collisions++; 797 798 if (status & OWL_EMAC_BIT_RDES0_CE) 799 netdev->stats.rx_crc_errors++; 800 801 if (status & OWL_EMAC_BIT_RDES0_ZERO) 802 netdev->stats.rx_fifo_errors++; 803 804 goto drop_skb; 805 } 806 807 len = (status & OWL_EMAC_MSK_RDES0_FL) >> OWL_EMAC_OFF_RDES0_FL; 808 if (unlikely(len > OWL_EMAC_RX_FRAME_MAX_LEN)) { 809 netdev->stats.rx_length_errors++; 810 netdev_err(netdev, "invalid RX frame len: %u\n", len); 811 goto drop_skb; 812 } 813 814 /* Prepare new skb before receiving the current one. */ 815 new_skb = owl_emac_alloc_skb(netdev); 816 if (unlikely(!new_skb)) 817 goto drop_skb; 818 819 new_dma = owl_emac_dma_map_rx(priv, new_skb); 820 if (dma_mapping_error(dev, new_dma)) { 821 dev_kfree_skb(new_skb); 822 netdev_err(netdev, "RX DMA mapping failed\n"); 823 goto drop_skb; 824 } 825 826 owl_emac_dma_unmap_rx(priv, curr_skb, curr_dma); 827 828 skb_put(curr_skb, len - ETH_FCS_LEN); 829 curr_skb->ip_summed = CHECKSUM_NONE; 830 curr_skb->protocol = eth_type_trans(curr_skb, netdev); 831 curr_skb->dev = netdev; 832 833 netif_receive_skb(curr_skb); 834 835 netdev->stats.rx_packets++; 836 netdev->stats.rx_bytes += len; 837 recv++; 838 goto push_skb; 839 840 drop_skb: 841 netdev->stats.rx_dropped++; 842 netdev->stats.rx_errors++; 843 /* Reuse the current skb. */ 844 new_skb = curr_skb; 845 new_dma = curr_dma; 846 847 push_skb: 848 spin_lock(&priv->lock); 849 850 ring->skbs[ring->head] = new_skb; 851 ring->skbs_dma[ring->head] = new_dma; 852 853 WRITE_ONCE(desc->buf_addr, new_dma); 854 dma_wmb(); /* Flush descriptor before changing ownership. */ 855 WRITE_ONCE(desc->status, OWL_EMAC_BIT_RDES0_OWN); 856 857 owl_emac_ring_push_head(ring); 858 859 spin_unlock(&priv->lock); 860 } 861 862 return recv; 863 } 864 865 static int owl_emac_poll(struct napi_struct *napi, int budget) 866 { 867 int work_done = 0, ru_cnt = 0, recv; 868 static int tx_err_cnt, rx_err_cnt; 869 struct owl_emac_priv *priv; 870 u32 status, proc_status; 871 872 priv = container_of(napi, struct owl_emac_priv, napi); 873 874 while ((status = owl_emac_irq_clear(priv)) & 875 (OWL_EMAC_BIT_MAC_CSR5_NIS | OWL_EMAC_BIT_MAC_CSR5_AIS)) { 876 recv = 0; 877 878 /* TX setup frame raises ETI instead of TI. */ 879 if (status & (OWL_EMAC_BIT_MAC_CSR5_TI | OWL_EMAC_BIT_MAC_CSR5_ETI)) { 880 owl_emac_tx_complete(priv); 881 tx_err_cnt = 0; 882 883 /* Count MAC internal RX errors. */ 884 proc_status = status & OWL_EMAC_MSK_MAC_CSR5_RS; 885 proc_status >>= OWL_EMAC_OFF_MAC_CSR5_RS; 886 if (proc_status == OWL_EMAC_VAL_MAC_CSR5_RS_DATA || 887 proc_status == OWL_EMAC_VAL_MAC_CSR5_RS_CDES || 888 proc_status == OWL_EMAC_VAL_MAC_CSR5_RS_FDES) 889 rx_err_cnt++; 890 } 891 892 if (status & OWL_EMAC_BIT_MAC_CSR5_RI) { 893 recv = owl_emac_rx_process(priv, budget - work_done); 894 rx_err_cnt = 0; 895 896 /* Count MAC internal TX errors. */ 897 proc_status = status & OWL_EMAC_MSK_MAC_CSR5_TS; 898 proc_status >>= OWL_EMAC_OFF_MAC_CSR5_TS; 899 if (proc_status == OWL_EMAC_VAL_MAC_CSR5_TS_DATA || 900 proc_status == OWL_EMAC_VAL_MAC_CSR5_TS_CDES) 901 tx_err_cnt++; 902 } else if (status & OWL_EMAC_BIT_MAC_CSR5_RU) { 903 /* MAC AHB is in suspended state, will return to RX 904 * descriptor processing when the host changes ownership 905 * of the descriptor and either an RX poll demand CMD is 906 * issued or a new frame is recognized by the MAC AHB. 907 */ 908 if (++ru_cnt == 2) 909 owl_emac_dma_cmd_resume_rx(priv); 910 911 recv = owl_emac_rx_process(priv, budget - work_done); 912 913 /* Guard against too many RU interrupts. */ 914 if (ru_cnt > 3) 915 break; 916 } 917 918 work_done += recv; 919 if (work_done >= budget) 920 break; 921 } 922 923 if (work_done < budget) { 924 napi_complete_done(napi, work_done); 925 owl_emac_irq_enable(priv); 926 } 927 928 /* Reset MAC when getting too many internal TX or RX errors. */ 929 if (tx_err_cnt > 10 || rx_err_cnt > 10) { 930 netdev_dbg(priv->netdev, "%s error status: 0x%08x\n", 931 tx_err_cnt > 10 ? "TX" : "RX", status); 932 rx_err_cnt = 0; 933 tx_err_cnt = 0; 934 schedule_work(&priv->mac_reset_task); 935 } 936 937 return work_done; 938 } 939 940 static void owl_emac_mdio_clock_enable(struct owl_emac_priv *priv) 941 { 942 u32 val; 943 944 /* Enable MDC clock generation by adjusting CLKDIV according to 945 * the vendor implementation of the original driver. 946 */ 947 val = owl_emac_reg_read(priv, OWL_EMAC_REG_MAC_CSR10); 948 val &= OWL_EMAC_MSK_MAC_CSR10_CLKDIV; 949 val |= OWL_EMAC_VAL_MAC_CSR10_CLKDIV_128 << OWL_EMAC_OFF_MAC_CSR10_CLKDIV; 950 951 val |= OWL_EMAC_BIT_MAC_CSR10_SB; 952 val |= OWL_EMAC_VAL_MAC_CSR10_OPCODE_CDS << OWL_EMAC_OFF_MAC_CSR10_OPCODE; 953 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR10, val); 954 } 955 956 static void owl_emac_core_hw_reset(struct owl_emac_priv *priv) 957 { 958 /* Trigger hardware reset. */ 959 reset_control_assert(priv->reset); 960 usleep_range(10, 20); 961 reset_control_deassert(priv->reset); 962 usleep_range(100, 200); 963 } 964 965 static int owl_emac_core_sw_reset(struct owl_emac_priv *priv) 966 { 967 u32 val; 968 int ret; 969 970 /* Trigger software reset. */ 971 owl_emac_reg_set(priv, OWL_EMAC_REG_MAC_CSR0, OWL_EMAC_BIT_MAC_CSR0_SWR); 972 ret = readl_poll_timeout(priv->base + OWL_EMAC_REG_MAC_CSR0, 973 val, !(val & OWL_EMAC_BIT_MAC_CSR0_SWR), 974 OWL_EMAC_POLL_DELAY_USEC, 975 OWL_EMAC_RESET_POLL_TIMEOUT_USEC); 976 if (ret) 977 return ret; 978 979 if (priv->phy_mode == PHY_INTERFACE_MODE_RMII) { 980 /* Enable RMII and use the 50MHz rmii clk as output to PHY. */ 981 val = 0; 982 } else { 983 /* Enable SMII and use the 125MHz rmii clk as output to PHY. 984 * Additionally set SMII SYNC delay to 4 half cycle. 985 */ 986 val = 0x04 << OWL_EMAC_OFF_MAC_CTRL_SSDC; 987 val |= OWL_EMAC_BIT_MAC_CTRL_RSIS; 988 } 989 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CTRL, val); 990 991 /* MDC is disabled after reset. */ 992 owl_emac_mdio_clock_enable(priv); 993 994 /* Set FIFO pause & restart threshold levels. */ 995 val = 0x40 << OWL_EMAC_OFF_MAC_CSR19_FPTL; 996 val |= 0x10 << OWL_EMAC_OFF_MAC_CSR19_FRTL; 997 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR19, val); 998 999 /* Set flow control pause quanta time to ~100 ms. */ 1000 val = 0x4FFF << OWL_EMAC_OFF_MAC_CSR18_PQT; 1001 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR18, val); 1002 1003 /* Setup interrupt mitigation. */ 1004 val = 7 << OWL_EMAC_OFF_MAC_CSR11_NRP; 1005 val |= 4 << OWL_EMAC_OFF_MAC_CSR11_RT; 1006 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR11, val); 1007 1008 /* Set RX/TX rings base addresses. */ 1009 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR3, 1010 (u32)(priv->rx_ring.descs_dma)); 1011 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR4, 1012 (u32)(priv->tx_ring.descs_dma)); 1013 1014 /* Setup initial operation mode. */ 1015 val = OWL_EMAC_VAL_MAC_CSR6_SPEED_100M << OWL_EMAC_OFF_MAC_CSR6_SPEED; 1016 val |= OWL_EMAC_BIT_MAC_CSR6_FD; 1017 owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, 1018 OWL_EMAC_MSK_MAC_CSR6_SPEED | 1019 OWL_EMAC_BIT_MAC_CSR6_FD, val); 1020 owl_emac_reg_clear(priv, OWL_EMAC_REG_MAC_CSR6, 1021 OWL_EMAC_BIT_MAC_CSR6_PR | OWL_EMAC_BIT_MAC_CSR6_PM); 1022 1023 priv->link = 0; 1024 priv->speed = SPEED_UNKNOWN; 1025 priv->duplex = DUPLEX_UNKNOWN; 1026 priv->pause = 0; 1027 priv->mcaddr_list.count = 0; 1028 1029 return 0; 1030 } 1031 1032 static int owl_emac_enable(struct net_device *netdev, bool start_phy) 1033 { 1034 struct owl_emac_priv *priv = netdev_priv(netdev); 1035 int ret; 1036 1037 owl_emac_dma_cmd_stop(priv); 1038 owl_emac_irq_disable(priv); 1039 owl_emac_irq_clear(priv); 1040 1041 owl_emac_ring_prepare_tx(priv); 1042 ret = owl_emac_ring_prepare_rx(priv); 1043 if (ret) 1044 goto err_unprep; 1045 1046 ret = owl_emac_core_sw_reset(priv); 1047 if (ret) { 1048 netdev_err(netdev, "failed to soft reset MAC core: %d\n", ret); 1049 goto err_unprep; 1050 } 1051 1052 owl_emac_set_hw_mac_addr(netdev); 1053 owl_emac_setup_frame_xmit(priv); 1054 1055 netdev_reset_queue(netdev); 1056 napi_enable(&priv->napi); 1057 1058 owl_emac_irq_enable(priv); 1059 owl_emac_dma_cmd_start(priv); 1060 1061 if (start_phy) 1062 phy_start(netdev->phydev); 1063 1064 netif_start_queue(netdev); 1065 1066 return 0; 1067 1068 err_unprep: 1069 owl_emac_ring_unprepare_rx(priv); 1070 owl_emac_ring_unprepare_tx(priv); 1071 1072 return ret; 1073 } 1074 1075 static void owl_emac_disable(struct net_device *netdev, bool stop_phy) 1076 { 1077 struct owl_emac_priv *priv = netdev_priv(netdev); 1078 1079 owl_emac_dma_cmd_stop(priv); 1080 owl_emac_irq_disable(priv); 1081 1082 netif_stop_queue(netdev); 1083 napi_disable(&priv->napi); 1084 1085 if (stop_phy) 1086 phy_stop(netdev->phydev); 1087 1088 owl_emac_ring_unprepare_rx(priv); 1089 owl_emac_ring_unprepare_tx(priv); 1090 } 1091 1092 static int owl_emac_ndo_open(struct net_device *netdev) 1093 { 1094 return owl_emac_enable(netdev, true); 1095 } 1096 1097 static int owl_emac_ndo_stop(struct net_device *netdev) 1098 { 1099 owl_emac_disable(netdev, true); 1100 1101 return 0; 1102 } 1103 1104 static void owl_emac_set_multicast(struct net_device *netdev, int count) 1105 { 1106 struct owl_emac_priv *priv = netdev_priv(netdev); 1107 struct netdev_hw_addr *ha; 1108 int index = 0; 1109 1110 if (count <= 0) { 1111 priv->mcaddr_list.count = 0; 1112 return; 1113 } 1114 1115 netdev_for_each_mc_addr(ha, netdev) { 1116 if (!is_multicast_ether_addr(ha->addr)) 1117 continue; 1118 1119 WARN_ON(index >= OWL_EMAC_MAX_MULTICAST_ADDRS); 1120 ether_addr_copy(priv->mcaddr_list.addrs[index++], ha->addr); 1121 } 1122 1123 priv->mcaddr_list.count = index; 1124 1125 owl_emac_setup_frame_xmit(priv); 1126 } 1127 1128 static void owl_emac_ndo_set_rx_mode(struct net_device *netdev) 1129 { 1130 struct owl_emac_priv *priv = netdev_priv(netdev); 1131 u32 status, val = 0; 1132 int mcast_count = 0; 1133 1134 if (netdev->flags & IFF_PROMISC) { 1135 val = OWL_EMAC_BIT_MAC_CSR6_PR; 1136 } else if (netdev->flags & IFF_ALLMULTI) { 1137 val = OWL_EMAC_BIT_MAC_CSR6_PM; 1138 } else if (netdev->flags & IFF_MULTICAST) { 1139 mcast_count = netdev_mc_count(netdev); 1140 1141 if (mcast_count > OWL_EMAC_MAX_MULTICAST_ADDRS) { 1142 val = OWL_EMAC_BIT_MAC_CSR6_PM; 1143 mcast_count = 0; 1144 } 1145 } 1146 1147 spin_lock_bh(&priv->lock); 1148 1149 /* Temporarily stop DMA TX & RX. */ 1150 status = owl_emac_dma_cmd_stop(priv); 1151 1152 /* Update operation modes. */ 1153 owl_emac_reg_update(priv, OWL_EMAC_REG_MAC_CSR6, 1154 OWL_EMAC_BIT_MAC_CSR6_PR | OWL_EMAC_BIT_MAC_CSR6_PM, 1155 val); 1156 1157 /* Restore DMA TX & RX status. */ 1158 owl_emac_dma_cmd_set(priv, status); 1159 1160 spin_unlock_bh(&priv->lock); 1161 1162 /* Set/reset multicast addr list. */ 1163 owl_emac_set_multicast(netdev, mcast_count); 1164 } 1165 1166 static int owl_emac_ndo_set_mac_addr(struct net_device *netdev, void *addr) 1167 { 1168 struct sockaddr *skaddr = addr; 1169 1170 if (!is_valid_ether_addr(skaddr->sa_data)) 1171 return -EADDRNOTAVAIL; 1172 1173 if (netif_running(netdev)) 1174 return -EBUSY; 1175 1176 eth_hw_addr_set(netdev, skaddr->sa_data); 1177 owl_emac_set_hw_mac_addr(netdev); 1178 1179 return owl_emac_setup_frame_xmit(netdev_priv(netdev)); 1180 } 1181 1182 static int owl_emac_ndo_eth_ioctl(struct net_device *netdev, 1183 struct ifreq *req, int cmd) 1184 { 1185 if (!netif_running(netdev)) 1186 return -EINVAL; 1187 1188 return phy_mii_ioctl(netdev->phydev, req, cmd); 1189 } 1190 1191 static void owl_emac_ndo_tx_timeout(struct net_device *netdev, 1192 unsigned int txqueue) 1193 { 1194 struct owl_emac_priv *priv = netdev_priv(netdev); 1195 1196 schedule_work(&priv->mac_reset_task); 1197 } 1198 1199 static void owl_emac_reset_task(struct work_struct *work) 1200 { 1201 struct owl_emac_priv *priv; 1202 1203 priv = container_of(work, struct owl_emac_priv, mac_reset_task); 1204 1205 netdev_dbg(priv->netdev, "resetting MAC\n"); 1206 owl_emac_disable(priv->netdev, false); 1207 owl_emac_enable(priv->netdev, false); 1208 } 1209 1210 static struct net_device_stats * 1211 owl_emac_ndo_get_stats(struct net_device *netdev) 1212 { 1213 /* FIXME: If possible, try to get stats from MAC hardware registers 1214 * instead of tracking them manually in the driver. 1215 */ 1216 1217 return &netdev->stats; 1218 } 1219 1220 static const struct net_device_ops owl_emac_netdev_ops = { 1221 .ndo_open = owl_emac_ndo_open, 1222 .ndo_stop = owl_emac_ndo_stop, 1223 .ndo_start_xmit = owl_emac_ndo_start_xmit, 1224 .ndo_set_rx_mode = owl_emac_ndo_set_rx_mode, 1225 .ndo_set_mac_address = owl_emac_ndo_set_mac_addr, 1226 .ndo_validate_addr = eth_validate_addr, 1227 .ndo_eth_ioctl = owl_emac_ndo_eth_ioctl, 1228 .ndo_tx_timeout = owl_emac_ndo_tx_timeout, 1229 .ndo_get_stats = owl_emac_ndo_get_stats, 1230 }; 1231 1232 static void owl_emac_ethtool_get_drvinfo(struct net_device *dev, 1233 struct ethtool_drvinfo *info) 1234 { 1235 strscpy(info->driver, OWL_EMAC_DRVNAME, sizeof(info->driver)); 1236 } 1237 1238 static u32 owl_emac_ethtool_get_msglevel(struct net_device *netdev) 1239 { 1240 struct owl_emac_priv *priv = netdev_priv(netdev); 1241 1242 return priv->msg_enable; 1243 } 1244 1245 static void owl_emac_ethtool_set_msglevel(struct net_device *ndev, u32 val) 1246 { 1247 struct owl_emac_priv *priv = netdev_priv(ndev); 1248 1249 priv->msg_enable = val; 1250 } 1251 1252 static const struct ethtool_ops owl_emac_ethtool_ops = { 1253 .get_drvinfo = owl_emac_ethtool_get_drvinfo, 1254 .get_link = ethtool_op_get_link, 1255 .get_link_ksettings = phy_ethtool_get_link_ksettings, 1256 .set_link_ksettings = phy_ethtool_set_link_ksettings, 1257 .get_msglevel = owl_emac_ethtool_get_msglevel, 1258 .set_msglevel = owl_emac_ethtool_set_msglevel, 1259 }; 1260 1261 static int owl_emac_mdio_wait(struct owl_emac_priv *priv) 1262 { 1263 u32 val; 1264 1265 /* Wait while data transfer is in progress. */ 1266 return readl_poll_timeout(priv->base + OWL_EMAC_REG_MAC_CSR10, 1267 val, !(val & OWL_EMAC_BIT_MAC_CSR10_SB), 1268 OWL_EMAC_POLL_DELAY_USEC, 1269 OWL_EMAC_MDIO_POLL_TIMEOUT_USEC); 1270 } 1271 1272 static int owl_emac_mdio_read(struct mii_bus *bus, int addr, int regnum) 1273 { 1274 struct owl_emac_priv *priv = bus->priv; 1275 u32 data, tmp; 1276 int ret; 1277 1278 data = OWL_EMAC_BIT_MAC_CSR10_SB; 1279 data |= OWL_EMAC_VAL_MAC_CSR10_OPCODE_RD << OWL_EMAC_OFF_MAC_CSR10_OPCODE; 1280 1281 tmp = addr << OWL_EMAC_OFF_MAC_CSR10_PHYADD; 1282 data |= tmp & OWL_EMAC_MSK_MAC_CSR10_PHYADD; 1283 1284 tmp = regnum << OWL_EMAC_OFF_MAC_CSR10_REGADD; 1285 data |= tmp & OWL_EMAC_MSK_MAC_CSR10_REGADD; 1286 1287 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR10, data); 1288 1289 ret = owl_emac_mdio_wait(priv); 1290 if (ret) 1291 return ret; 1292 1293 data = owl_emac_reg_read(priv, OWL_EMAC_REG_MAC_CSR10); 1294 data &= OWL_EMAC_MSK_MAC_CSR10_DATA; 1295 1296 return data; 1297 } 1298 1299 static int 1300 owl_emac_mdio_write(struct mii_bus *bus, int addr, int regnum, u16 val) 1301 { 1302 struct owl_emac_priv *priv = bus->priv; 1303 u32 data, tmp; 1304 1305 data = OWL_EMAC_BIT_MAC_CSR10_SB; 1306 data |= OWL_EMAC_VAL_MAC_CSR10_OPCODE_WR << OWL_EMAC_OFF_MAC_CSR10_OPCODE; 1307 1308 tmp = addr << OWL_EMAC_OFF_MAC_CSR10_PHYADD; 1309 data |= tmp & OWL_EMAC_MSK_MAC_CSR10_PHYADD; 1310 1311 tmp = regnum << OWL_EMAC_OFF_MAC_CSR10_REGADD; 1312 data |= tmp & OWL_EMAC_MSK_MAC_CSR10_REGADD; 1313 1314 data |= val & OWL_EMAC_MSK_MAC_CSR10_DATA; 1315 1316 owl_emac_reg_write(priv, OWL_EMAC_REG_MAC_CSR10, data); 1317 1318 return owl_emac_mdio_wait(priv); 1319 } 1320 1321 static int owl_emac_mdio_init(struct net_device *netdev) 1322 { 1323 struct owl_emac_priv *priv = netdev_priv(netdev); 1324 struct device *dev = owl_emac_get_dev(priv); 1325 struct device_node *mdio_node; 1326 int ret; 1327 1328 mdio_node = of_get_child_by_name(dev->of_node, "mdio"); 1329 if (!mdio_node) 1330 return -ENODEV; 1331 1332 if (!of_device_is_available(mdio_node)) { 1333 ret = -ENODEV; 1334 goto err_put_node; 1335 } 1336 1337 priv->mii = devm_mdiobus_alloc(dev); 1338 if (!priv->mii) { 1339 ret = -ENOMEM; 1340 goto err_put_node; 1341 } 1342 1343 snprintf(priv->mii->id, MII_BUS_ID_SIZE, "%s", dev_name(dev)); 1344 priv->mii->name = "owl-emac-mdio"; 1345 priv->mii->parent = dev; 1346 priv->mii->read = owl_emac_mdio_read; 1347 priv->mii->write = owl_emac_mdio_write; 1348 priv->mii->phy_mask = ~0; /* Mask out all PHYs from auto probing. */ 1349 priv->mii->priv = priv; 1350 1351 ret = devm_of_mdiobus_register(dev, priv->mii, mdio_node); 1352 1353 err_put_node: 1354 of_node_put(mdio_node); 1355 return ret; 1356 } 1357 1358 static int owl_emac_phy_init(struct net_device *netdev) 1359 { 1360 struct owl_emac_priv *priv = netdev_priv(netdev); 1361 struct device *dev = owl_emac_get_dev(priv); 1362 struct phy_device *phy; 1363 1364 phy = of_phy_get_and_connect(netdev, dev->of_node, 1365 owl_emac_adjust_link); 1366 if (!phy) 1367 return -ENODEV; 1368 1369 phy_set_sym_pause(phy, true, true, true); 1370 1371 if (netif_msg_link(priv)) 1372 phy_attached_info(phy); 1373 1374 return 0; 1375 } 1376 1377 static void owl_emac_get_mac_addr(struct net_device *netdev) 1378 { 1379 struct device *dev = netdev->dev.parent; 1380 int ret; 1381 1382 ret = platform_get_ethdev_address(dev, netdev); 1383 if (!ret && is_valid_ether_addr(netdev->dev_addr)) 1384 return; 1385 1386 eth_hw_addr_random(netdev); 1387 dev_warn(dev, "using random MAC address %pM\n", netdev->dev_addr); 1388 } 1389 1390 static __maybe_unused int owl_emac_suspend(struct device *dev) 1391 { 1392 struct net_device *netdev = dev_get_drvdata(dev); 1393 struct owl_emac_priv *priv = netdev_priv(netdev); 1394 1395 disable_irq(netdev->irq); 1396 1397 if (netif_running(netdev)) { 1398 owl_emac_disable(netdev, true); 1399 netif_device_detach(netdev); 1400 } 1401 1402 clk_bulk_disable_unprepare(OWL_EMAC_NCLKS, priv->clks); 1403 1404 return 0; 1405 } 1406 1407 static __maybe_unused int owl_emac_resume(struct device *dev) 1408 { 1409 struct net_device *netdev = dev_get_drvdata(dev); 1410 struct owl_emac_priv *priv = netdev_priv(netdev); 1411 int ret; 1412 1413 ret = clk_bulk_prepare_enable(OWL_EMAC_NCLKS, priv->clks); 1414 if (ret) 1415 return ret; 1416 1417 if (netif_running(netdev)) { 1418 owl_emac_core_hw_reset(priv); 1419 owl_emac_core_sw_reset(priv); 1420 1421 ret = owl_emac_enable(netdev, true); 1422 if (ret) { 1423 clk_bulk_disable_unprepare(OWL_EMAC_NCLKS, priv->clks); 1424 return ret; 1425 } 1426 1427 netif_device_attach(netdev); 1428 } 1429 1430 enable_irq(netdev->irq); 1431 1432 return 0; 1433 } 1434 1435 static void owl_emac_clk_disable_unprepare(void *data) 1436 { 1437 struct owl_emac_priv *priv = data; 1438 1439 clk_bulk_disable_unprepare(OWL_EMAC_NCLKS, priv->clks); 1440 } 1441 1442 static int owl_emac_clk_set_rate(struct owl_emac_priv *priv) 1443 { 1444 struct device *dev = owl_emac_get_dev(priv); 1445 unsigned long rate; 1446 int ret; 1447 1448 switch (priv->phy_mode) { 1449 case PHY_INTERFACE_MODE_RMII: 1450 rate = 50000000; 1451 break; 1452 1453 case PHY_INTERFACE_MODE_SMII: 1454 rate = 125000000; 1455 break; 1456 1457 default: 1458 dev_err(dev, "unsupported phy interface mode %d\n", 1459 priv->phy_mode); 1460 return -EOPNOTSUPP; 1461 } 1462 1463 ret = clk_set_rate(priv->clks[OWL_EMAC_CLK_RMII].clk, rate); 1464 if (ret) 1465 dev_err(dev, "failed to set RMII clock rate: %d\n", ret); 1466 1467 return ret; 1468 } 1469 1470 static int owl_emac_probe(struct platform_device *pdev) 1471 { 1472 struct device *dev = &pdev->dev; 1473 struct net_device *netdev; 1474 struct owl_emac_priv *priv; 1475 int ret, i; 1476 1477 netdev = devm_alloc_etherdev(dev, sizeof(*priv)); 1478 if (!netdev) 1479 return -ENOMEM; 1480 1481 platform_set_drvdata(pdev, netdev); 1482 SET_NETDEV_DEV(netdev, dev); 1483 1484 priv = netdev_priv(netdev); 1485 priv->netdev = netdev; 1486 priv->msg_enable = netif_msg_init(-1, OWL_EMAC_DEFAULT_MSG_ENABLE); 1487 1488 ret = of_get_phy_mode(dev->of_node, &priv->phy_mode); 1489 if (ret) { 1490 dev_err(dev, "failed to get phy mode: %d\n", ret); 1491 return ret; 1492 } 1493 1494 spin_lock_init(&priv->lock); 1495 1496 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 1497 if (ret) { 1498 dev_err(dev, "unsupported DMA mask\n"); 1499 return ret; 1500 } 1501 1502 ret = owl_emac_ring_alloc(dev, &priv->rx_ring, OWL_EMAC_RX_RING_SIZE); 1503 if (ret) 1504 return ret; 1505 1506 ret = owl_emac_ring_alloc(dev, &priv->tx_ring, OWL_EMAC_TX_RING_SIZE); 1507 if (ret) 1508 return ret; 1509 1510 priv->base = devm_platform_ioremap_resource(pdev, 0); 1511 if (IS_ERR(priv->base)) 1512 return PTR_ERR(priv->base); 1513 1514 netdev->irq = platform_get_irq(pdev, 0); 1515 if (netdev->irq < 0) 1516 return netdev->irq; 1517 1518 ret = devm_request_irq(dev, netdev->irq, owl_emac_handle_irq, 1519 IRQF_SHARED, netdev->name, netdev); 1520 if (ret) { 1521 dev_err(dev, "failed to request irq: %d\n", netdev->irq); 1522 return ret; 1523 } 1524 1525 for (i = 0; i < OWL_EMAC_NCLKS; i++) 1526 priv->clks[i].id = owl_emac_clk_names[i]; 1527 1528 ret = devm_clk_bulk_get(dev, OWL_EMAC_NCLKS, priv->clks); 1529 if (ret) 1530 return ret; 1531 1532 ret = clk_bulk_prepare_enable(OWL_EMAC_NCLKS, priv->clks); 1533 if (ret) 1534 return ret; 1535 1536 ret = devm_add_action_or_reset(dev, owl_emac_clk_disable_unprepare, priv); 1537 if (ret) 1538 return ret; 1539 1540 ret = owl_emac_clk_set_rate(priv); 1541 if (ret) 1542 return ret; 1543 1544 priv->reset = devm_reset_control_get_exclusive(dev, NULL); 1545 if (IS_ERR(priv->reset)) 1546 return dev_err_probe(dev, PTR_ERR(priv->reset), 1547 "failed to get reset control"); 1548 1549 owl_emac_get_mac_addr(netdev); 1550 1551 owl_emac_core_hw_reset(priv); 1552 owl_emac_mdio_clock_enable(priv); 1553 1554 ret = owl_emac_mdio_init(netdev); 1555 if (ret) { 1556 dev_err(dev, "failed to initialize MDIO bus\n"); 1557 return ret; 1558 } 1559 1560 ret = owl_emac_phy_init(netdev); 1561 if (ret) { 1562 dev_err(dev, "failed to initialize PHY\n"); 1563 return ret; 1564 } 1565 1566 INIT_WORK(&priv->mac_reset_task, owl_emac_reset_task); 1567 1568 netdev->min_mtu = OWL_EMAC_MTU_MIN; 1569 netdev->max_mtu = OWL_EMAC_MTU_MAX; 1570 netdev->watchdog_timeo = OWL_EMAC_TX_TIMEOUT; 1571 netdev->netdev_ops = &owl_emac_netdev_ops; 1572 netdev->ethtool_ops = &owl_emac_ethtool_ops; 1573 netif_napi_add(netdev, &priv->napi, owl_emac_poll); 1574 1575 ret = devm_register_netdev(dev, netdev); 1576 if (ret) { 1577 netif_napi_del(&priv->napi); 1578 phy_disconnect(netdev->phydev); 1579 return ret; 1580 } 1581 1582 return 0; 1583 } 1584 1585 static int owl_emac_remove(struct platform_device *pdev) 1586 { 1587 struct owl_emac_priv *priv = platform_get_drvdata(pdev); 1588 1589 netif_napi_del(&priv->napi); 1590 phy_disconnect(priv->netdev->phydev); 1591 cancel_work_sync(&priv->mac_reset_task); 1592 1593 return 0; 1594 } 1595 1596 static const struct of_device_id owl_emac_of_match[] = { 1597 { .compatible = "actions,owl-emac", }, 1598 { } 1599 }; 1600 MODULE_DEVICE_TABLE(of, owl_emac_of_match); 1601 1602 static SIMPLE_DEV_PM_OPS(owl_emac_pm_ops, 1603 owl_emac_suspend, owl_emac_resume); 1604 1605 static struct platform_driver owl_emac_driver = { 1606 .driver = { 1607 .name = OWL_EMAC_DRVNAME, 1608 .of_match_table = owl_emac_of_match, 1609 .pm = &owl_emac_pm_ops, 1610 }, 1611 .probe = owl_emac_probe, 1612 .remove = owl_emac_remove, 1613 }; 1614 module_platform_driver(owl_emac_driver); 1615 1616 MODULE_DESCRIPTION("Actions Semi Owl SoCs Ethernet MAC Driver"); 1617 MODULE_AUTHOR("Actions Semi Inc."); 1618 MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>"); 1619 MODULE_LICENSE("GPL"); 1620