1 // SPDX-License-Identifier: GPL-2.0 2 /* Renesas Ethernet AVB device driver 3 * 4 * Copyright (C) 2014-2019 Renesas Electronics Corporation 5 * Copyright (C) 2015 Renesas Solutions Corp. 6 * Copyright (C) 2015-2016 Cogent Embedded, Inc. <source@cogentembedded.com> 7 * 8 * Based on the SuperH Ethernet driver 9 */ 10 11 #include <linux/cache.h> 12 #include <linux/clk.h> 13 #include <linux/delay.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/err.h> 16 #include <linux/etherdevice.h> 17 #include <linux/ethtool.h> 18 #include <linux/if_vlan.h> 19 #include <linux/kernel.h> 20 #include <linux/list.h> 21 #include <linux/module.h> 22 #include <linux/net_tstamp.h> 23 #include <linux/of.h> 24 #include <linux/of_device.h> 25 #include <linux/of_irq.h> 26 #include <linux/of_mdio.h> 27 #include <linux/of_net.h> 28 #include <linux/pm_runtime.h> 29 #include <linux/slab.h> 30 #include <linux/spinlock.h> 31 #include <linux/sys_soc.h> 32 #include <linux/reset.h> 33 #include <linux/math64.h> 34 35 #include "ravb.h" 36 37 #define RAVB_DEF_MSG_ENABLE \ 38 (NETIF_MSG_LINK | \ 39 NETIF_MSG_TIMER | \ 40 NETIF_MSG_RX_ERR | \ 41 NETIF_MSG_TX_ERR) 42 43 static const char *ravb_rx_irqs[NUM_RX_QUEUE] = { 44 "ch0", /* RAVB_BE */ 45 "ch1", /* RAVB_NC */ 46 }; 47 48 static const char *ravb_tx_irqs[NUM_TX_QUEUE] = { 49 "ch18", /* RAVB_BE */ 50 "ch19", /* RAVB_NC */ 51 }; 52 53 void ravb_modify(struct net_device *ndev, enum ravb_reg reg, u32 clear, 54 u32 set) 55 { 56 ravb_write(ndev, (ravb_read(ndev, reg) & ~clear) | set, reg); 57 } 58 59 int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value) 60 { 61 int i; 62 63 for (i = 0; i < 10000; i++) { 64 if ((ravb_read(ndev, reg) & mask) == value) 65 return 0; 66 udelay(10); 67 } 68 return -ETIMEDOUT; 69 } 70 71 static int ravb_config(struct net_device *ndev) 72 { 73 int error; 74 75 /* Set config mode */ 76 ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG); 77 /* Check if the operating mode is changed to the config mode */ 78 error = ravb_wait(ndev, CSR, CSR_OPS, CSR_OPS_CONFIG); 79 if (error) 80 netdev_err(ndev, "failed to switch device to config mode\n"); 81 82 return error; 83 } 84 85 static void ravb_set_rate_gbeth(struct net_device *ndev) 86 { 87 struct ravb_private *priv = netdev_priv(ndev); 88 89 switch (priv->speed) { 90 case 10: /* 10BASE */ 91 ravb_write(ndev, GBETH_GECMR_SPEED_10, GECMR); 92 break; 93 case 100: /* 100BASE */ 94 ravb_write(ndev, GBETH_GECMR_SPEED_100, GECMR); 95 break; 96 case 1000: /* 1000BASE */ 97 ravb_write(ndev, GBETH_GECMR_SPEED_1000, GECMR); 98 break; 99 } 100 } 101 102 static void ravb_set_rate_rcar(struct net_device *ndev) 103 { 104 struct ravb_private *priv = netdev_priv(ndev); 105 106 switch (priv->speed) { 107 case 100: /* 100BASE */ 108 ravb_write(ndev, GECMR_SPEED_100, GECMR); 109 break; 110 case 1000: /* 1000BASE */ 111 ravb_write(ndev, GECMR_SPEED_1000, GECMR); 112 break; 113 } 114 } 115 116 static void ravb_set_buffer_align(struct sk_buff *skb) 117 { 118 u32 reserve = (unsigned long)skb->data & (RAVB_ALIGN - 1); 119 120 if (reserve) 121 skb_reserve(skb, RAVB_ALIGN - reserve); 122 } 123 124 /* Get MAC address from the MAC address registers 125 * 126 * Ethernet AVB device doesn't have ROM for MAC address. 127 * This function gets the MAC address that was used by a bootloader. 128 */ 129 static void ravb_read_mac_address(struct device_node *np, 130 struct net_device *ndev) 131 { 132 int ret; 133 134 ret = of_get_ethdev_address(np, ndev); 135 if (ret) { 136 u32 mahr = ravb_read(ndev, MAHR); 137 u32 malr = ravb_read(ndev, MALR); 138 u8 addr[ETH_ALEN]; 139 140 addr[0] = (mahr >> 24) & 0xFF; 141 addr[1] = (mahr >> 16) & 0xFF; 142 addr[2] = (mahr >> 8) & 0xFF; 143 addr[3] = (mahr >> 0) & 0xFF; 144 addr[4] = (malr >> 8) & 0xFF; 145 addr[5] = (malr >> 0) & 0xFF; 146 eth_hw_addr_set(ndev, addr); 147 } 148 } 149 150 static void ravb_mdio_ctrl(struct mdiobb_ctrl *ctrl, u32 mask, int set) 151 { 152 struct ravb_private *priv = container_of(ctrl, struct ravb_private, 153 mdiobb); 154 155 ravb_modify(priv->ndev, PIR, mask, set ? mask : 0); 156 } 157 158 /* MDC pin control */ 159 static void ravb_set_mdc(struct mdiobb_ctrl *ctrl, int level) 160 { 161 ravb_mdio_ctrl(ctrl, PIR_MDC, level); 162 } 163 164 /* Data I/O pin control */ 165 static void ravb_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output) 166 { 167 ravb_mdio_ctrl(ctrl, PIR_MMD, output); 168 } 169 170 /* Set data bit */ 171 static void ravb_set_mdio_data(struct mdiobb_ctrl *ctrl, int value) 172 { 173 ravb_mdio_ctrl(ctrl, PIR_MDO, value); 174 } 175 176 /* Get data bit */ 177 static int ravb_get_mdio_data(struct mdiobb_ctrl *ctrl) 178 { 179 struct ravb_private *priv = container_of(ctrl, struct ravb_private, 180 mdiobb); 181 182 return (ravb_read(priv->ndev, PIR) & PIR_MDI) != 0; 183 } 184 185 /* MDIO bus control struct */ 186 static const struct mdiobb_ops bb_ops = { 187 .owner = THIS_MODULE, 188 .set_mdc = ravb_set_mdc, 189 .set_mdio_dir = ravb_set_mdio_dir, 190 .set_mdio_data = ravb_set_mdio_data, 191 .get_mdio_data = ravb_get_mdio_data, 192 }; 193 194 /* Free TX skb function for AVB-IP */ 195 static int ravb_tx_free(struct net_device *ndev, int q, bool free_txed_only) 196 { 197 struct ravb_private *priv = netdev_priv(ndev); 198 struct net_device_stats *stats = &priv->stats[q]; 199 unsigned int num_tx_desc = priv->num_tx_desc; 200 struct ravb_tx_desc *desc; 201 unsigned int entry; 202 int free_num = 0; 203 u32 size; 204 205 for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) { 206 bool txed; 207 208 entry = priv->dirty_tx[q] % (priv->num_tx_ring[q] * 209 num_tx_desc); 210 desc = &priv->tx_ring[q][entry]; 211 txed = desc->die_dt == DT_FEMPTY; 212 if (free_txed_only && !txed) 213 break; 214 /* Descriptor type must be checked before all other reads */ 215 dma_rmb(); 216 size = le16_to_cpu(desc->ds_tagl) & TX_DS; 217 /* Free the original skb. */ 218 if (priv->tx_skb[q][entry / num_tx_desc]) { 219 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr), 220 size, DMA_TO_DEVICE); 221 /* Last packet descriptor? */ 222 if (entry % num_tx_desc == num_tx_desc - 1) { 223 entry /= num_tx_desc; 224 dev_kfree_skb_any(priv->tx_skb[q][entry]); 225 priv->tx_skb[q][entry] = NULL; 226 if (txed) 227 stats->tx_packets++; 228 } 229 free_num++; 230 } 231 if (txed) 232 stats->tx_bytes += size; 233 desc->die_dt = DT_EEMPTY; 234 } 235 return free_num; 236 } 237 238 static void ravb_rx_ring_free_gbeth(struct net_device *ndev, int q) 239 { 240 struct ravb_private *priv = netdev_priv(ndev); 241 unsigned int ring_size; 242 unsigned int i; 243 244 if (!priv->gbeth_rx_ring) 245 return; 246 247 for (i = 0; i < priv->num_rx_ring[q]; i++) { 248 struct ravb_rx_desc *desc = &priv->gbeth_rx_ring[i]; 249 250 if (!dma_mapping_error(ndev->dev.parent, 251 le32_to_cpu(desc->dptr))) 252 dma_unmap_single(ndev->dev.parent, 253 le32_to_cpu(desc->dptr), 254 GBETH_RX_BUFF_MAX, 255 DMA_FROM_DEVICE); 256 } 257 ring_size = sizeof(struct ravb_rx_desc) * (priv->num_rx_ring[q] + 1); 258 dma_free_coherent(ndev->dev.parent, ring_size, priv->gbeth_rx_ring, 259 priv->rx_desc_dma[q]); 260 priv->gbeth_rx_ring = NULL; 261 } 262 263 static void ravb_rx_ring_free_rcar(struct net_device *ndev, int q) 264 { 265 struct ravb_private *priv = netdev_priv(ndev); 266 unsigned int ring_size; 267 unsigned int i; 268 269 if (!priv->rx_ring[q]) 270 return; 271 272 for (i = 0; i < priv->num_rx_ring[q]; i++) { 273 struct ravb_ex_rx_desc *desc = &priv->rx_ring[q][i]; 274 275 if (!dma_mapping_error(ndev->dev.parent, 276 le32_to_cpu(desc->dptr))) 277 dma_unmap_single(ndev->dev.parent, 278 le32_to_cpu(desc->dptr), 279 RX_BUF_SZ, 280 DMA_FROM_DEVICE); 281 } 282 ring_size = sizeof(struct ravb_ex_rx_desc) * 283 (priv->num_rx_ring[q] + 1); 284 dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q], 285 priv->rx_desc_dma[q]); 286 priv->rx_ring[q] = NULL; 287 } 288 289 /* Free skb's and DMA buffers for Ethernet AVB */ 290 static void ravb_ring_free(struct net_device *ndev, int q) 291 { 292 struct ravb_private *priv = netdev_priv(ndev); 293 const struct ravb_hw_info *info = priv->info; 294 unsigned int num_tx_desc = priv->num_tx_desc; 295 unsigned int ring_size; 296 unsigned int i; 297 298 info->rx_ring_free(ndev, q); 299 300 if (priv->tx_ring[q]) { 301 ravb_tx_free(ndev, q, false); 302 303 ring_size = sizeof(struct ravb_tx_desc) * 304 (priv->num_tx_ring[q] * num_tx_desc + 1); 305 dma_free_coherent(ndev->dev.parent, ring_size, priv->tx_ring[q], 306 priv->tx_desc_dma[q]); 307 priv->tx_ring[q] = NULL; 308 } 309 310 /* Free RX skb ringbuffer */ 311 if (priv->rx_skb[q]) { 312 for (i = 0; i < priv->num_rx_ring[q]; i++) 313 dev_kfree_skb(priv->rx_skb[q][i]); 314 } 315 kfree(priv->rx_skb[q]); 316 priv->rx_skb[q] = NULL; 317 318 /* Free aligned TX buffers */ 319 kfree(priv->tx_align[q]); 320 priv->tx_align[q] = NULL; 321 322 /* Free TX skb ringbuffer. 323 * SKBs are freed by ravb_tx_free() call above. 324 */ 325 kfree(priv->tx_skb[q]); 326 priv->tx_skb[q] = NULL; 327 } 328 329 static void ravb_rx_ring_format_gbeth(struct net_device *ndev, int q) 330 { 331 struct ravb_private *priv = netdev_priv(ndev); 332 struct ravb_rx_desc *rx_desc; 333 unsigned int rx_ring_size; 334 dma_addr_t dma_addr; 335 unsigned int i; 336 337 rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q]; 338 memset(priv->gbeth_rx_ring, 0, rx_ring_size); 339 /* Build RX ring buffer */ 340 for (i = 0; i < priv->num_rx_ring[q]; i++) { 341 /* RX descriptor */ 342 rx_desc = &priv->gbeth_rx_ring[i]; 343 rx_desc->ds_cc = cpu_to_le16(GBETH_RX_DESC_DATA_SIZE); 344 dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data, 345 GBETH_RX_BUFF_MAX, 346 DMA_FROM_DEVICE); 347 /* We just set the data size to 0 for a failed mapping which 348 * should prevent DMA from happening... 349 */ 350 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 351 rx_desc->ds_cc = cpu_to_le16(0); 352 rx_desc->dptr = cpu_to_le32(dma_addr); 353 rx_desc->die_dt = DT_FEMPTY; 354 } 355 rx_desc = &priv->gbeth_rx_ring[i]; 356 rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]); 357 rx_desc->die_dt = DT_LINKFIX; /* type */ 358 } 359 360 static void ravb_rx_ring_format_rcar(struct net_device *ndev, int q) 361 { 362 struct ravb_private *priv = netdev_priv(ndev); 363 struct ravb_ex_rx_desc *rx_desc; 364 unsigned int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q]; 365 dma_addr_t dma_addr; 366 unsigned int i; 367 368 memset(priv->rx_ring[q], 0, rx_ring_size); 369 /* Build RX ring buffer */ 370 for (i = 0; i < priv->num_rx_ring[q]; i++) { 371 /* RX descriptor */ 372 rx_desc = &priv->rx_ring[q][i]; 373 rx_desc->ds_cc = cpu_to_le16(RX_BUF_SZ); 374 dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data, 375 RX_BUF_SZ, 376 DMA_FROM_DEVICE); 377 /* We just set the data size to 0 for a failed mapping which 378 * should prevent DMA from happening... 379 */ 380 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 381 rx_desc->ds_cc = cpu_to_le16(0); 382 rx_desc->dptr = cpu_to_le32(dma_addr); 383 rx_desc->die_dt = DT_FEMPTY; 384 } 385 rx_desc = &priv->rx_ring[q][i]; 386 rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]); 387 rx_desc->die_dt = DT_LINKFIX; /* type */ 388 } 389 390 /* Format skb and descriptor buffer for Ethernet AVB */ 391 static void ravb_ring_format(struct net_device *ndev, int q) 392 { 393 struct ravb_private *priv = netdev_priv(ndev); 394 const struct ravb_hw_info *info = priv->info; 395 unsigned int num_tx_desc = priv->num_tx_desc; 396 struct ravb_tx_desc *tx_desc; 397 struct ravb_desc *desc; 398 unsigned int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] * 399 num_tx_desc; 400 unsigned int i; 401 402 priv->cur_rx[q] = 0; 403 priv->cur_tx[q] = 0; 404 priv->dirty_rx[q] = 0; 405 priv->dirty_tx[q] = 0; 406 407 info->rx_ring_format(ndev, q); 408 409 memset(priv->tx_ring[q], 0, tx_ring_size); 410 /* Build TX ring buffer */ 411 for (i = 0, tx_desc = priv->tx_ring[q]; i < priv->num_tx_ring[q]; 412 i++, tx_desc++) { 413 tx_desc->die_dt = DT_EEMPTY; 414 if (num_tx_desc > 1) { 415 tx_desc++; 416 tx_desc->die_dt = DT_EEMPTY; 417 } 418 } 419 tx_desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]); 420 tx_desc->die_dt = DT_LINKFIX; /* type */ 421 422 /* RX descriptor base address for best effort */ 423 desc = &priv->desc_bat[RX_QUEUE_OFFSET + q]; 424 desc->die_dt = DT_LINKFIX; /* type */ 425 desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]); 426 427 /* TX descriptor base address for best effort */ 428 desc = &priv->desc_bat[q]; 429 desc->die_dt = DT_LINKFIX; /* type */ 430 desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]); 431 } 432 433 static void *ravb_alloc_rx_desc_gbeth(struct net_device *ndev, int q) 434 { 435 struct ravb_private *priv = netdev_priv(ndev); 436 unsigned int ring_size; 437 438 ring_size = sizeof(struct ravb_rx_desc) * (priv->num_rx_ring[q] + 1); 439 440 priv->gbeth_rx_ring = dma_alloc_coherent(ndev->dev.parent, ring_size, 441 &priv->rx_desc_dma[q], 442 GFP_KERNEL); 443 return priv->gbeth_rx_ring; 444 } 445 446 static void *ravb_alloc_rx_desc_rcar(struct net_device *ndev, int q) 447 { 448 struct ravb_private *priv = netdev_priv(ndev); 449 unsigned int ring_size; 450 451 ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1); 452 453 priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size, 454 &priv->rx_desc_dma[q], 455 GFP_KERNEL); 456 return priv->rx_ring[q]; 457 } 458 459 /* Init skb and descriptor buffer for Ethernet AVB */ 460 static int ravb_ring_init(struct net_device *ndev, int q) 461 { 462 struct ravb_private *priv = netdev_priv(ndev); 463 const struct ravb_hw_info *info = priv->info; 464 unsigned int num_tx_desc = priv->num_tx_desc; 465 unsigned int ring_size; 466 struct sk_buff *skb; 467 unsigned int i; 468 469 /* Allocate RX and TX skb rings */ 470 priv->rx_skb[q] = kcalloc(priv->num_rx_ring[q], 471 sizeof(*priv->rx_skb[q]), GFP_KERNEL); 472 priv->tx_skb[q] = kcalloc(priv->num_tx_ring[q], 473 sizeof(*priv->tx_skb[q]), GFP_KERNEL); 474 if (!priv->rx_skb[q] || !priv->tx_skb[q]) 475 goto error; 476 477 for (i = 0; i < priv->num_rx_ring[q]; i++) { 478 skb = __netdev_alloc_skb(ndev, info->max_rx_len, GFP_KERNEL); 479 if (!skb) 480 goto error; 481 ravb_set_buffer_align(skb); 482 priv->rx_skb[q][i] = skb; 483 } 484 485 if (num_tx_desc > 1) { 486 /* Allocate rings for the aligned buffers */ 487 priv->tx_align[q] = kmalloc(DPTR_ALIGN * priv->num_tx_ring[q] + 488 DPTR_ALIGN - 1, GFP_KERNEL); 489 if (!priv->tx_align[q]) 490 goto error; 491 } 492 493 /* Allocate all RX descriptors. */ 494 if (!info->alloc_rx_desc(ndev, q)) 495 goto error; 496 497 priv->dirty_rx[q] = 0; 498 499 /* Allocate all TX descriptors. */ 500 ring_size = sizeof(struct ravb_tx_desc) * 501 (priv->num_tx_ring[q] * num_tx_desc + 1); 502 priv->tx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size, 503 &priv->tx_desc_dma[q], 504 GFP_KERNEL); 505 if (!priv->tx_ring[q]) 506 goto error; 507 508 return 0; 509 510 error: 511 ravb_ring_free(ndev, q); 512 513 return -ENOMEM; 514 } 515 516 static void ravb_emac_init_gbeth(struct net_device *ndev) 517 { 518 struct ravb_private *priv = netdev_priv(ndev); 519 520 /* Receive frame limit set register */ 521 ravb_write(ndev, GBETH_RX_BUFF_MAX + ETH_FCS_LEN, RFLR); 522 523 /* EMAC Mode: PAUSE prohibition; Duplex; TX; RX; CRC Pass Through */ 524 ravb_write(ndev, ECMR_ZPF | ((priv->duplex > 0) ? ECMR_DM : 0) | 525 ECMR_TE | ECMR_RE | ECMR_RCPT | 526 ECMR_TXF | ECMR_RXF, ECMR); 527 528 ravb_set_rate_gbeth(ndev); 529 530 /* Set MAC address */ 531 ravb_write(ndev, 532 (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) | 533 (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR); 534 ravb_write(ndev, (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR); 535 536 /* E-MAC status register clear */ 537 ravb_write(ndev, ECSR_ICD | ECSR_LCHNG | ECSR_PFRI, ECSR); 538 ravb_write(ndev, CSR0_TPE | CSR0_RPE, CSR0); 539 540 /* E-MAC interrupt enable register */ 541 ravb_write(ndev, ECSIPR_ICDIP, ECSIPR); 542 543 ravb_modify(ndev, CXR31, CXR31_SEL_LINK0 | CXR31_SEL_LINK1, CXR31_SEL_LINK0); 544 } 545 546 static void ravb_emac_init_rcar(struct net_device *ndev) 547 { 548 /* Receive frame limit set register */ 549 ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR); 550 551 /* EMAC Mode: PAUSE prohibition; Duplex; RX Checksum; TX; RX */ 552 ravb_write(ndev, ECMR_ZPF | ECMR_DM | 553 (ndev->features & NETIF_F_RXCSUM ? ECMR_RCSC : 0) | 554 ECMR_TE | ECMR_RE, ECMR); 555 556 ravb_set_rate_rcar(ndev); 557 558 /* Set MAC address */ 559 ravb_write(ndev, 560 (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) | 561 (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR); 562 ravb_write(ndev, 563 (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR); 564 565 /* E-MAC status register clear */ 566 ravb_write(ndev, ECSR_ICD | ECSR_MPD, ECSR); 567 568 /* E-MAC interrupt enable register */ 569 ravb_write(ndev, ECSIPR_ICDIP | ECSIPR_MPDIP | ECSIPR_LCHNGIP, ECSIPR); 570 } 571 572 /* E-MAC init function */ 573 static void ravb_emac_init(struct net_device *ndev) 574 { 575 struct ravb_private *priv = netdev_priv(ndev); 576 const struct ravb_hw_info *info = priv->info; 577 578 info->emac_init(ndev); 579 } 580 581 static int ravb_dmac_init_gbeth(struct net_device *ndev) 582 { 583 int error; 584 585 error = ravb_ring_init(ndev, RAVB_BE); 586 if (error) 587 return error; 588 589 /* Descriptor format */ 590 ravb_ring_format(ndev, RAVB_BE); 591 592 /* Set DMAC RX */ 593 ravb_write(ndev, 0x60000000, RCR); 594 595 /* Set Max Frame Length (RTC) */ 596 ravb_write(ndev, 0x7ffc0000 | GBETH_RX_BUFF_MAX, RTC); 597 598 /* Set FIFO size */ 599 ravb_write(ndev, 0x00222200, TGC); 600 601 ravb_write(ndev, 0, TCCR); 602 603 /* Frame receive */ 604 ravb_write(ndev, RIC0_FRE0, RIC0); 605 /* Disable FIFO full warning */ 606 ravb_write(ndev, 0x0, RIC1); 607 /* Receive FIFO full error, descriptor empty */ 608 ravb_write(ndev, RIC2_QFE0 | RIC2_RFFE, RIC2); 609 610 ravb_write(ndev, TIC_FTE0, TIC); 611 612 return 0; 613 } 614 615 static int ravb_dmac_init_rcar(struct net_device *ndev) 616 { 617 struct ravb_private *priv = netdev_priv(ndev); 618 const struct ravb_hw_info *info = priv->info; 619 int error; 620 621 error = ravb_ring_init(ndev, RAVB_BE); 622 if (error) 623 return error; 624 error = ravb_ring_init(ndev, RAVB_NC); 625 if (error) { 626 ravb_ring_free(ndev, RAVB_BE); 627 return error; 628 } 629 630 /* Descriptor format */ 631 ravb_ring_format(ndev, RAVB_BE); 632 ravb_ring_format(ndev, RAVB_NC); 633 634 /* Set AVB RX */ 635 ravb_write(ndev, 636 RCR_EFFS | RCR_ENCF | RCR_ETS0 | RCR_ESF | 0x18000000, RCR); 637 638 /* Set FIFO size */ 639 ravb_write(ndev, TGC_TQP_AVBMODE1 | 0x00112200, TGC); 640 641 /* Timestamp enable */ 642 ravb_write(ndev, TCCR_TFEN, TCCR); 643 644 /* Interrupt init: */ 645 if (info->multi_irqs) { 646 /* Clear DIL.DPLx */ 647 ravb_write(ndev, 0, DIL); 648 /* Set queue specific interrupt */ 649 ravb_write(ndev, CIE_CRIE | CIE_CTIE | CIE_CL0M, CIE); 650 } 651 /* Frame receive */ 652 ravb_write(ndev, RIC0_FRE0 | RIC0_FRE1, RIC0); 653 /* Disable FIFO full warning */ 654 ravb_write(ndev, 0, RIC1); 655 /* Receive FIFO full error, descriptor empty */ 656 ravb_write(ndev, RIC2_QFE0 | RIC2_QFE1 | RIC2_RFFE, RIC2); 657 /* Frame transmitted, timestamp FIFO updated */ 658 ravb_write(ndev, TIC_FTE0 | TIC_FTE1 | TIC_TFUE, TIC); 659 660 return 0; 661 } 662 663 /* Device init function for Ethernet AVB */ 664 static int ravb_dmac_init(struct net_device *ndev) 665 { 666 struct ravb_private *priv = netdev_priv(ndev); 667 const struct ravb_hw_info *info = priv->info; 668 int error; 669 670 /* Set CONFIG mode */ 671 error = ravb_config(ndev); 672 if (error) 673 return error; 674 675 error = info->dmac_init(ndev); 676 if (error) 677 return error; 678 679 /* Setting the control will start the AVB-DMAC process. */ 680 ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_OPERATION); 681 682 return 0; 683 } 684 685 static void ravb_get_tx_tstamp(struct net_device *ndev) 686 { 687 struct ravb_private *priv = netdev_priv(ndev); 688 struct ravb_tstamp_skb *ts_skb, *ts_skb2; 689 struct skb_shared_hwtstamps shhwtstamps; 690 struct sk_buff *skb; 691 struct timespec64 ts; 692 u16 tag, tfa_tag; 693 int count; 694 u32 tfa2; 695 696 count = (ravb_read(ndev, TSR) & TSR_TFFL) >> 8; 697 while (count--) { 698 tfa2 = ravb_read(ndev, TFA2); 699 tfa_tag = (tfa2 & TFA2_TST) >> 16; 700 ts.tv_nsec = (u64)ravb_read(ndev, TFA0); 701 ts.tv_sec = ((u64)(tfa2 & TFA2_TSV) << 32) | 702 ravb_read(ndev, TFA1); 703 memset(&shhwtstamps, 0, sizeof(shhwtstamps)); 704 shhwtstamps.hwtstamp = timespec64_to_ktime(ts); 705 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, 706 list) { 707 skb = ts_skb->skb; 708 tag = ts_skb->tag; 709 list_del(&ts_skb->list); 710 kfree(ts_skb); 711 if (tag == tfa_tag) { 712 skb_tstamp_tx(skb, &shhwtstamps); 713 dev_consume_skb_any(skb); 714 break; 715 } else { 716 dev_kfree_skb_any(skb); 717 } 718 } 719 ravb_modify(ndev, TCCR, TCCR_TFR, TCCR_TFR); 720 } 721 } 722 723 static void ravb_rx_csum(struct sk_buff *skb) 724 { 725 u8 *hw_csum; 726 727 /* The hardware checksum is contained in sizeof(__sum16) (2) bytes 728 * appended to packet data 729 */ 730 if (unlikely(skb->len < sizeof(__sum16))) 731 return; 732 hw_csum = skb_tail_pointer(skb) - sizeof(__sum16); 733 skb->csum = csum_unfold((__force __sum16)get_unaligned_le16(hw_csum)); 734 skb->ip_summed = CHECKSUM_COMPLETE; 735 skb_trim(skb, skb->len - sizeof(__sum16)); 736 } 737 738 static struct sk_buff *ravb_get_skb_gbeth(struct net_device *ndev, int entry, 739 struct ravb_rx_desc *desc) 740 { 741 struct ravb_private *priv = netdev_priv(ndev); 742 struct sk_buff *skb; 743 744 skb = priv->rx_skb[RAVB_BE][entry]; 745 priv->rx_skb[RAVB_BE][entry] = NULL; 746 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr), 747 ALIGN(GBETH_RX_BUFF_MAX, 16), DMA_FROM_DEVICE); 748 749 return skb; 750 } 751 752 /* Packet receive function for Gigabit Ethernet */ 753 static bool ravb_rx_gbeth(struct net_device *ndev, int *quota, int q) 754 { 755 struct ravb_private *priv = netdev_priv(ndev); 756 const struct ravb_hw_info *info = priv->info; 757 struct net_device_stats *stats; 758 struct ravb_rx_desc *desc; 759 struct sk_buff *skb; 760 dma_addr_t dma_addr; 761 u8 desc_status; 762 int boguscnt; 763 u16 pkt_len; 764 u8 die_dt; 765 int entry; 766 int limit; 767 768 entry = priv->cur_rx[q] % priv->num_rx_ring[q]; 769 boguscnt = priv->dirty_rx[q] + priv->num_rx_ring[q] - priv->cur_rx[q]; 770 stats = &priv->stats[q]; 771 772 boguscnt = min(boguscnt, *quota); 773 limit = boguscnt; 774 desc = &priv->gbeth_rx_ring[entry]; 775 while (desc->die_dt != DT_FEMPTY) { 776 /* Descriptor type must be checked before all other reads */ 777 dma_rmb(); 778 desc_status = desc->msc; 779 pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS; 780 781 if (--boguscnt < 0) 782 break; 783 784 /* We use 0-byte descriptors to mark the DMA mapping errors */ 785 if (!pkt_len) 786 continue; 787 788 if (desc_status & MSC_MC) 789 stats->multicast++; 790 791 if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF | MSC_CEEF)) { 792 stats->rx_errors++; 793 if (desc_status & MSC_CRC) 794 stats->rx_crc_errors++; 795 if (desc_status & MSC_RFE) 796 stats->rx_frame_errors++; 797 if (desc_status & (MSC_RTLF | MSC_RTSF)) 798 stats->rx_length_errors++; 799 if (desc_status & MSC_CEEF) 800 stats->rx_missed_errors++; 801 } else { 802 die_dt = desc->die_dt & 0xF0; 803 switch (die_dt) { 804 case DT_FSINGLE: 805 skb = ravb_get_skb_gbeth(ndev, entry, desc); 806 skb_put(skb, pkt_len); 807 skb->protocol = eth_type_trans(skb, ndev); 808 napi_gro_receive(&priv->napi[q], skb); 809 stats->rx_packets++; 810 stats->rx_bytes += pkt_len; 811 break; 812 case DT_FSTART: 813 priv->rx_1st_skb = ravb_get_skb_gbeth(ndev, entry, desc); 814 skb_put(priv->rx_1st_skb, pkt_len); 815 break; 816 case DT_FMID: 817 skb = ravb_get_skb_gbeth(ndev, entry, desc); 818 skb_copy_to_linear_data_offset(priv->rx_1st_skb, 819 priv->rx_1st_skb->len, 820 skb->data, 821 pkt_len); 822 skb_put(priv->rx_1st_skb, pkt_len); 823 dev_kfree_skb(skb); 824 break; 825 case DT_FEND: 826 skb = ravb_get_skb_gbeth(ndev, entry, desc); 827 skb_copy_to_linear_data_offset(priv->rx_1st_skb, 828 priv->rx_1st_skb->len, 829 skb->data, 830 pkt_len); 831 skb_put(priv->rx_1st_skb, pkt_len); 832 dev_kfree_skb(skb); 833 priv->rx_1st_skb->protocol = 834 eth_type_trans(priv->rx_1st_skb, ndev); 835 napi_gro_receive(&priv->napi[q], 836 priv->rx_1st_skb); 837 stats->rx_packets++; 838 stats->rx_bytes += priv->rx_1st_skb->len; 839 break; 840 } 841 } 842 843 entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q]; 844 desc = &priv->gbeth_rx_ring[entry]; 845 } 846 847 /* Refill the RX ring buffers. */ 848 for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) { 849 entry = priv->dirty_rx[q] % priv->num_rx_ring[q]; 850 desc = &priv->gbeth_rx_ring[entry]; 851 desc->ds_cc = cpu_to_le16(GBETH_RX_DESC_DATA_SIZE); 852 853 if (!priv->rx_skb[q][entry]) { 854 skb = netdev_alloc_skb(ndev, info->max_rx_len); 855 if (!skb) 856 break; 857 ravb_set_buffer_align(skb); 858 dma_addr = dma_map_single(ndev->dev.parent, 859 skb->data, 860 GBETH_RX_BUFF_MAX, 861 DMA_FROM_DEVICE); 862 skb_checksum_none_assert(skb); 863 /* We just set the data size to 0 for a failed mapping 864 * which should prevent DMA from happening... 865 */ 866 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 867 desc->ds_cc = cpu_to_le16(0); 868 desc->dptr = cpu_to_le32(dma_addr); 869 priv->rx_skb[q][entry] = skb; 870 } 871 /* Descriptor type must be set after all the above writes */ 872 dma_wmb(); 873 desc->die_dt = DT_FEMPTY; 874 } 875 876 *quota -= limit - (++boguscnt); 877 878 return boguscnt <= 0; 879 } 880 881 /* Packet receive function for Ethernet AVB */ 882 static bool ravb_rx_rcar(struct net_device *ndev, int *quota, int q) 883 { 884 struct ravb_private *priv = netdev_priv(ndev); 885 const struct ravb_hw_info *info = priv->info; 886 int entry = priv->cur_rx[q] % priv->num_rx_ring[q]; 887 int boguscnt = (priv->dirty_rx[q] + priv->num_rx_ring[q]) - 888 priv->cur_rx[q]; 889 struct net_device_stats *stats = &priv->stats[q]; 890 struct ravb_ex_rx_desc *desc; 891 struct sk_buff *skb; 892 dma_addr_t dma_addr; 893 struct timespec64 ts; 894 u8 desc_status; 895 u16 pkt_len; 896 int limit; 897 898 boguscnt = min(boguscnt, *quota); 899 limit = boguscnt; 900 desc = &priv->rx_ring[q][entry]; 901 while (desc->die_dt != DT_FEMPTY) { 902 /* Descriptor type must be checked before all other reads */ 903 dma_rmb(); 904 desc_status = desc->msc; 905 pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS; 906 907 if (--boguscnt < 0) 908 break; 909 910 /* We use 0-byte descriptors to mark the DMA mapping errors */ 911 if (!pkt_len) 912 continue; 913 914 if (desc_status & MSC_MC) 915 stats->multicast++; 916 917 if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF | 918 MSC_CEEF)) { 919 stats->rx_errors++; 920 if (desc_status & MSC_CRC) 921 stats->rx_crc_errors++; 922 if (desc_status & MSC_RFE) 923 stats->rx_frame_errors++; 924 if (desc_status & (MSC_RTLF | MSC_RTSF)) 925 stats->rx_length_errors++; 926 if (desc_status & MSC_CEEF) 927 stats->rx_missed_errors++; 928 } else { 929 u32 get_ts = priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE; 930 931 skb = priv->rx_skb[q][entry]; 932 priv->rx_skb[q][entry] = NULL; 933 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr), 934 RX_BUF_SZ, 935 DMA_FROM_DEVICE); 936 get_ts &= (q == RAVB_NC) ? 937 RAVB_RXTSTAMP_TYPE_V2_L2_EVENT : 938 ~RAVB_RXTSTAMP_TYPE_V2_L2_EVENT; 939 if (get_ts) { 940 struct skb_shared_hwtstamps *shhwtstamps; 941 942 shhwtstamps = skb_hwtstamps(skb); 943 memset(shhwtstamps, 0, sizeof(*shhwtstamps)); 944 ts.tv_sec = ((u64) le16_to_cpu(desc->ts_sh) << 945 32) | le32_to_cpu(desc->ts_sl); 946 ts.tv_nsec = le32_to_cpu(desc->ts_n); 947 shhwtstamps->hwtstamp = timespec64_to_ktime(ts); 948 } 949 950 skb_put(skb, pkt_len); 951 skb->protocol = eth_type_trans(skb, ndev); 952 if (ndev->features & NETIF_F_RXCSUM) 953 ravb_rx_csum(skb); 954 napi_gro_receive(&priv->napi[q], skb); 955 stats->rx_packets++; 956 stats->rx_bytes += pkt_len; 957 } 958 959 entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q]; 960 desc = &priv->rx_ring[q][entry]; 961 } 962 963 /* Refill the RX ring buffers. */ 964 for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) { 965 entry = priv->dirty_rx[q] % priv->num_rx_ring[q]; 966 desc = &priv->rx_ring[q][entry]; 967 desc->ds_cc = cpu_to_le16(RX_BUF_SZ); 968 969 if (!priv->rx_skb[q][entry]) { 970 skb = netdev_alloc_skb(ndev, info->max_rx_len); 971 if (!skb) 972 break; /* Better luck next round. */ 973 ravb_set_buffer_align(skb); 974 dma_addr = dma_map_single(ndev->dev.parent, skb->data, 975 le16_to_cpu(desc->ds_cc), 976 DMA_FROM_DEVICE); 977 skb_checksum_none_assert(skb); 978 /* We just set the data size to 0 for a failed mapping 979 * which should prevent DMA from happening... 980 */ 981 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 982 desc->ds_cc = cpu_to_le16(0); 983 desc->dptr = cpu_to_le32(dma_addr); 984 priv->rx_skb[q][entry] = skb; 985 } 986 /* Descriptor type must be set after all the above writes */ 987 dma_wmb(); 988 desc->die_dt = DT_FEMPTY; 989 } 990 991 *quota -= limit - (++boguscnt); 992 993 return boguscnt <= 0; 994 } 995 996 /* Packet receive function for Ethernet AVB */ 997 static bool ravb_rx(struct net_device *ndev, int *quota, int q) 998 { 999 struct ravb_private *priv = netdev_priv(ndev); 1000 const struct ravb_hw_info *info = priv->info; 1001 1002 return info->receive(ndev, quota, q); 1003 } 1004 1005 static void ravb_rcv_snd_disable(struct net_device *ndev) 1006 { 1007 /* Disable TX and RX */ 1008 ravb_modify(ndev, ECMR, ECMR_RE | ECMR_TE, 0); 1009 } 1010 1011 static void ravb_rcv_snd_enable(struct net_device *ndev) 1012 { 1013 /* Enable TX and RX */ 1014 ravb_modify(ndev, ECMR, ECMR_RE | ECMR_TE, ECMR_RE | ECMR_TE); 1015 } 1016 1017 /* function for waiting dma process finished */ 1018 static int ravb_stop_dma(struct net_device *ndev) 1019 { 1020 struct ravb_private *priv = netdev_priv(ndev); 1021 const struct ravb_hw_info *info = priv->info; 1022 int error; 1023 1024 /* Wait for stopping the hardware TX process */ 1025 error = ravb_wait(ndev, TCCR, info->tccr_mask, 0); 1026 1027 if (error) 1028 return error; 1029 1030 error = ravb_wait(ndev, CSR, CSR_TPO0 | CSR_TPO1 | CSR_TPO2 | CSR_TPO3, 1031 0); 1032 if (error) 1033 return error; 1034 1035 /* Stop the E-MAC's RX/TX processes. */ 1036 ravb_rcv_snd_disable(ndev); 1037 1038 /* Wait for stopping the RX DMA process */ 1039 error = ravb_wait(ndev, CSR, CSR_RPO, 0); 1040 if (error) 1041 return error; 1042 1043 /* Stop AVB-DMAC process */ 1044 return ravb_config(ndev); 1045 } 1046 1047 /* E-MAC interrupt handler */ 1048 static void ravb_emac_interrupt_unlocked(struct net_device *ndev) 1049 { 1050 struct ravb_private *priv = netdev_priv(ndev); 1051 u32 ecsr, psr; 1052 1053 ecsr = ravb_read(ndev, ECSR); 1054 ravb_write(ndev, ecsr, ECSR); /* clear interrupt */ 1055 1056 if (ecsr & ECSR_MPD) 1057 pm_wakeup_event(&priv->pdev->dev, 0); 1058 if (ecsr & ECSR_ICD) 1059 ndev->stats.tx_carrier_errors++; 1060 if (ecsr & ECSR_LCHNG) { 1061 /* Link changed */ 1062 if (priv->no_avb_link) 1063 return; 1064 psr = ravb_read(ndev, PSR); 1065 if (priv->avb_link_active_low) 1066 psr ^= PSR_LMON; 1067 if (!(psr & PSR_LMON)) { 1068 /* DIsable RX and TX */ 1069 ravb_rcv_snd_disable(ndev); 1070 } else { 1071 /* Enable RX and TX */ 1072 ravb_rcv_snd_enable(ndev); 1073 } 1074 } 1075 } 1076 1077 static irqreturn_t ravb_emac_interrupt(int irq, void *dev_id) 1078 { 1079 struct net_device *ndev = dev_id; 1080 struct ravb_private *priv = netdev_priv(ndev); 1081 1082 spin_lock(&priv->lock); 1083 ravb_emac_interrupt_unlocked(ndev); 1084 spin_unlock(&priv->lock); 1085 return IRQ_HANDLED; 1086 } 1087 1088 /* Error interrupt handler */ 1089 static void ravb_error_interrupt(struct net_device *ndev) 1090 { 1091 struct ravb_private *priv = netdev_priv(ndev); 1092 u32 eis, ris2; 1093 1094 eis = ravb_read(ndev, EIS); 1095 ravb_write(ndev, ~(EIS_QFS | EIS_RESERVED), EIS); 1096 if (eis & EIS_QFS) { 1097 ris2 = ravb_read(ndev, RIS2); 1098 ravb_write(ndev, ~(RIS2_QFF0 | RIS2_RFFF | RIS2_RESERVED), 1099 RIS2); 1100 1101 /* Receive Descriptor Empty int */ 1102 if (ris2 & RIS2_QFF0) 1103 priv->stats[RAVB_BE].rx_over_errors++; 1104 1105 /* Receive Descriptor Empty int */ 1106 if (ris2 & RIS2_QFF1) 1107 priv->stats[RAVB_NC].rx_over_errors++; 1108 1109 /* Receive FIFO Overflow int */ 1110 if (ris2 & RIS2_RFFF) 1111 priv->rx_fifo_errors++; 1112 } 1113 } 1114 1115 static bool ravb_queue_interrupt(struct net_device *ndev, int q) 1116 { 1117 struct ravb_private *priv = netdev_priv(ndev); 1118 const struct ravb_hw_info *info = priv->info; 1119 u32 ris0 = ravb_read(ndev, RIS0); 1120 u32 ric0 = ravb_read(ndev, RIC0); 1121 u32 tis = ravb_read(ndev, TIS); 1122 u32 tic = ravb_read(ndev, TIC); 1123 1124 if (((ris0 & ric0) & BIT(q)) || ((tis & tic) & BIT(q))) { 1125 if (napi_schedule_prep(&priv->napi[q])) { 1126 /* Mask RX and TX interrupts */ 1127 if (!info->irq_en_dis) { 1128 ravb_write(ndev, ric0 & ~BIT(q), RIC0); 1129 ravb_write(ndev, tic & ~BIT(q), TIC); 1130 } else { 1131 ravb_write(ndev, BIT(q), RID0); 1132 ravb_write(ndev, BIT(q), TID); 1133 } 1134 __napi_schedule(&priv->napi[q]); 1135 } else { 1136 netdev_warn(ndev, 1137 "ignoring interrupt, rx status 0x%08x, rx mask 0x%08x,\n", 1138 ris0, ric0); 1139 netdev_warn(ndev, 1140 " tx status 0x%08x, tx mask 0x%08x.\n", 1141 tis, tic); 1142 } 1143 return true; 1144 } 1145 return false; 1146 } 1147 1148 static bool ravb_timestamp_interrupt(struct net_device *ndev) 1149 { 1150 u32 tis = ravb_read(ndev, TIS); 1151 1152 if (tis & TIS_TFUF) { 1153 ravb_write(ndev, ~(TIS_TFUF | TIS_RESERVED), TIS); 1154 ravb_get_tx_tstamp(ndev); 1155 return true; 1156 } 1157 return false; 1158 } 1159 1160 static irqreturn_t ravb_interrupt(int irq, void *dev_id) 1161 { 1162 struct net_device *ndev = dev_id; 1163 struct ravb_private *priv = netdev_priv(ndev); 1164 const struct ravb_hw_info *info = priv->info; 1165 irqreturn_t result = IRQ_NONE; 1166 u32 iss; 1167 1168 spin_lock(&priv->lock); 1169 /* Get interrupt status */ 1170 iss = ravb_read(ndev, ISS); 1171 1172 /* Received and transmitted interrupts */ 1173 if (iss & (ISS_FRS | ISS_FTS | ISS_TFUS)) { 1174 int q; 1175 1176 /* Timestamp updated */ 1177 if (ravb_timestamp_interrupt(ndev)) 1178 result = IRQ_HANDLED; 1179 1180 /* Network control and best effort queue RX/TX */ 1181 if (info->nc_queues) { 1182 for (q = RAVB_NC; q >= RAVB_BE; q--) { 1183 if (ravb_queue_interrupt(ndev, q)) 1184 result = IRQ_HANDLED; 1185 } 1186 } else { 1187 if (ravb_queue_interrupt(ndev, RAVB_BE)) 1188 result = IRQ_HANDLED; 1189 } 1190 } 1191 1192 /* E-MAC status summary */ 1193 if (iss & ISS_MS) { 1194 ravb_emac_interrupt_unlocked(ndev); 1195 result = IRQ_HANDLED; 1196 } 1197 1198 /* Error status summary */ 1199 if (iss & ISS_ES) { 1200 ravb_error_interrupt(ndev); 1201 result = IRQ_HANDLED; 1202 } 1203 1204 /* gPTP interrupt status summary */ 1205 if (iss & ISS_CGIS) { 1206 ravb_ptp_interrupt(ndev); 1207 result = IRQ_HANDLED; 1208 } 1209 1210 spin_unlock(&priv->lock); 1211 return result; 1212 } 1213 1214 /* Timestamp/Error/gPTP interrupt handler */ 1215 static irqreturn_t ravb_multi_interrupt(int irq, void *dev_id) 1216 { 1217 struct net_device *ndev = dev_id; 1218 struct ravb_private *priv = netdev_priv(ndev); 1219 irqreturn_t result = IRQ_NONE; 1220 u32 iss; 1221 1222 spin_lock(&priv->lock); 1223 /* Get interrupt status */ 1224 iss = ravb_read(ndev, ISS); 1225 1226 /* Timestamp updated */ 1227 if ((iss & ISS_TFUS) && ravb_timestamp_interrupt(ndev)) 1228 result = IRQ_HANDLED; 1229 1230 /* Error status summary */ 1231 if (iss & ISS_ES) { 1232 ravb_error_interrupt(ndev); 1233 result = IRQ_HANDLED; 1234 } 1235 1236 /* gPTP interrupt status summary */ 1237 if (iss & ISS_CGIS) { 1238 ravb_ptp_interrupt(ndev); 1239 result = IRQ_HANDLED; 1240 } 1241 1242 spin_unlock(&priv->lock); 1243 return result; 1244 } 1245 1246 static irqreturn_t ravb_dma_interrupt(int irq, void *dev_id, int q) 1247 { 1248 struct net_device *ndev = dev_id; 1249 struct ravb_private *priv = netdev_priv(ndev); 1250 irqreturn_t result = IRQ_NONE; 1251 1252 spin_lock(&priv->lock); 1253 1254 /* Network control/Best effort queue RX/TX */ 1255 if (ravb_queue_interrupt(ndev, q)) 1256 result = IRQ_HANDLED; 1257 1258 spin_unlock(&priv->lock); 1259 return result; 1260 } 1261 1262 static irqreturn_t ravb_be_interrupt(int irq, void *dev_id) 1263 { 1264 return ravb_dma_interrupt(irq, dev_id, RAVB_BE); 1265 } 1266 1267 static irqreturn_t ravb_nc_interrupt(int irq, void *dev_id) 1268 { 1269 return ravb_dma_interrupt(irq, dev_id, RAVB_NC); 1270 } 1271 1272 static int ravb_poll(struct napi_struct *napi, int budget) 1273 { 1274 struct net_device *ndev = napi->dev; 1275 struct ravb_private *priv = netdev_priv(ndev); 1276 const struct ravb_hw_info *info = priv->info; 1277 bool gptp = info->gptp || info->ccc_gac; 1278 struct ravb_rx_desc *desc; 1279 unsigned long flags; 1280 int q = napi - priv->napi; 1281 int mask = BIT(q); 1282 int quota = budget; 1283 unsigned int entry; 1284 1285 if (!gptp) { 1286 entry = priv->cur_rx[q] % priv->num_rx_ring[q]; 1287 desc = &priv->gbeth_rx_ring[entry]; 1288 } 1289 /* Processing RX Descriptor Ring */ 1290 /* Clear RX interrupt */ 1291 ravb_write(ndev, ~(mask | RIS0_RESERVED), RIS0); 1292 if (gptp || desc->die_dt != DT_FEMPTY) { 1293 if (ravb_rx(ndev, "a, q)) 1294 goto out; 1295 } 1296 1297 /* Processing TX Descriptor Ring */ 1298 spin_lock_irqsave(&priv->lock, flags); 1299 /* Clear TX interrupt */ 1300 ravb_write(ndev, ~(mask | TIS_RESERVED), TIS); 1301 ravb_tx_free(ndev, q, true); 1302 netif_wake_subqueue(ndev, q); 1303 spin_unlock_irqrestore(&priv->lock, flags); 1304 1305 napi_complete(napi); 1306 1307 /* Re-enable RX/TX interrupts */ 1308 spin_lock_irqsave(&priv->lock, flags); 1309 if (!info->irq_en_dis) { 1310 ravb_modify(ndev, RIC0, mask, mask); 1311 ravb_modify(ndev, TIC, mask, mask); 1312 } else { 1313 ravb_write(ndev, mask, RIE0); 1314 ravb_write(ndev, mask, TIE); 1315 } 1316 spin_unlock_irqrestore(&priv->lock, flags); 1317 1318 /* Receive error message handling */ 1319 priv->rx_over_errors = priv->stats[RAVB_BE].rx_over_errors; 1320 if (info->nc_queues) 1321 priv->rx_over_errors += priv->stats[RAVB_NC].rx_over_errors; 1322 if (priv->rx_over_errors != ndev->stats.rx_over_errors) 1323 ndev->stats.rx_over_errors = priv->rx_over_errors; 1324 if (priv->rx_fifo_errors != ndev->stats.rx_fifo_errors) 1325 ndev->stats.rx_fifo_errors = priv->rx_fifo_errors; 1326 out: 1327 return budget - quota; 1328 } 1329 1330 static void ravb_set_duplex_gbeth(struct net_device *ndev) 1331 { 1332 struct ravb_private *priv = netdev_priv(ndev); 1333 1334 ravb_modify(ndev, ECMR, ECMR_DM, priv->duplex > 0 ? ECMR_DM : 0); 1335 } 1336 1337 /* PHY state control function */ 1338 static void ravb_adjust_link(struct net_device *ndev) 1339 { 1340 struct ravb_private *priv = netdev_priv(ndev); 1341 const struct ravb_hw_info *info = priv->info; 1342 struct phy_device *phydev = ndev->phydev; 1343 bool new_state = false; 1344 unsigned long flags; 1345 1346 spin_lock_irqsave(&priv->lock, flags); 1347 1348 /* Disable TX and RX right over here, if E-MAC change is ignored */ 1349 if (priv->no_avb_link) 1350 ravb_rcv_snd_disable(ndev); 1351 1352 if (phydev->link) { 1353 if (info->half_duplex && phydev->duplex != priv->duplex) { 1354 new_state = true; 1355 priv->duplex = phydev->duplex; 1356 ravb_set_duplex_gbeth(ndev); 1357 } 1358 1359 if (phydev->speed != priv->speed) { 1360 new_state = true; 1361 priv->speed = phydev->speed; 1362 info->set_rate(ndev); 1363 } 1364 if (!priv->link) { 1365 ravb_modify(ndev, ECMR, ECMR_TXF, 0); 1366 new_state = true; 1367 priv->link = phydev->link; 1368 } 1369 } else if (priv->link) { 1370 new_state = true; 1371 priv->link = 0; 1372 priv->speed = 0; 1373 if (info->half_duplex) 1374 priv->duplex = -1; 1375 } 1376 1377 /* Enable TX and RX right over here, if E-MAC change is ignored */ 1378 if (priv->no_avb_link && phydev->link) 1379 ravb_rcv_snd_enable(ndev); 1380 1381 spin_unlock_irqrestore(&priv->lock, flags); 1382 1383 if (new_state && netif_msg_link(priv)) 1384 phy_print_status(phydev); 1385 } 1386 1387 static const struct soc_device_attribute r8a7795es10[] = { 1388 { .soc_id = "r8a7795", .revision = "ES1.0", }, 1389 { /* sentinel */ } 1390 }; 1391 1392 /* PHY init function */ 1393 static int ravb_phy_init(struct net_device *ndev) 1394 { 1395 struct device_node *np = ndev->dev.parent->of_node; 1396 struct ravb_private *priv = netdev_priv(ndev); 1397 const struct ravb_hw_info *info = priv->info; 1398 struct phy_device *phydev; 1399 struct device_node *pn; 1400 phy_interface_t iface; 1401 int err; 1402 1403 priv->link = 0; 1404 priv->speed = 0; 1405 priv->duplex = -1; 1406 1407 /* Try connecting to PHY */ 1408 pn = of_parse_phandle(np, "phy-handle", 0); 1409 if (!pn) { 1410 /* In the case of a fixed PHY, the DT node associated 1411 * to the PHY is the Ethernet MAC DT node. 1412 */ 1413 if (of_phy_is_fixed_link(np)) { 1414 err = of_phy_register_fixed_link(np); 1415 if (err) 1416 return err; 1417 } 1418 pn = of_node_get(np); 1419 } 1420 1421 iface = priv->rgmii_override ? PHY_INTERFACE_MODE_RGMII 1422 : priv->phy_interface; 1423 phydev = of_phy_connect(ndev, pn, ravb_adjust_link, 0, iface); 1424 of_node_put(pn); 1425 if (!phydev) { 1426 netdev_err(ndev, "failed to connect PHY\n"); 1427 err = -ENOENT; 1428 goto err_deregister_fixed_link; 1429 } 1430 1431 /* This driver only support 10/100Mbit speeds on R-Car H3 ES1.0 1432 * at this time. 1433 */ 1434 if (soc_device_match(r8a7795es10)) { 1435 phy_set_max_speed(phydev, SPEED_100); 1436 1437 netdev_info(ndev, "limited PHY to 100Mbit/s\n"); 1438 } 1439 1440 if (!info->half_duplex) { 1441 /* 10BASE, Pause and Asym Pause is not supported */ 1442 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Half_BIT); 1443 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_10baseT_Full_BIT); 1444 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_Pause_BIT); 1445 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_Asym_Pause_BIT); 1446 1447 /* Half Duplex is not supported */ 1448 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT); 1449 phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_100baseT_Half_BIT); 1450 } 1451 1452 phy_attached_info(phydev); 1453 1454 return 0; 1455 1456 err_deregister_fixed_link: 1457 if (of_phy_is_fixed_link(np)) 1458 of_phy_deregister_fixed_link(np); 1459 1460 return err; 1461 } 1462 1463 /* PHY control start function */ 1464 static int ravb_phy_start(struct net_device *ndev) 1465 { 1466 int error; 1467 1468 error = ravb_phy_init(ndev); 1469 if (error) 1470 return error; 1471 1472 phy_start(ndev->phydev); 1473 1474 return 0; 1475 } 1476 1477 static u32 ravb_get_msglevel(struct net_device *ndev) 1478 { 1479 struct ravb_private *priv = netdev_priv(ndev); 1480 1481 return priv->msg_enable; 1482 } 1483 1484 static void ravb_set_msglevel(struct net_device *ndev, u32 value) 1485 { 1486 struct ravb_private *priv = netdev_priv(ndev); 1487 1488 priv->msg_enable = value; 1489 } 1490 1491 static const char ravb_gstrings_stats_gbeth[][ETH_GSTRING_LEN] = { 1492 "rx_queue_0_current", 1493 "tx_queue_0_current", 1494 "rx_queue_0_dirty", 1495 "tx_queue_0_dirty", 1496 "rx_queue_0_packets", 1497 "tx_queue_0_packets", 1498 "rx_queue_0_bytes", 1499 "tx_queue_0_bytes", 1500 "rx_queue_0_mcast_packets", 1501 "rx_queue_0_errors", 1502 "rx_queue_0_crc_errors", 1503 "rx_queue_0_frame_errors", 1504 "rx_queue_0_length_errors", 1505 "rx_queue_0_csum_offload_errors", 1506 "rx_queue_0_over_errors", 1507 }; 1508 1509 static const char ravb_gstrings_stats[][ETH_GSTRING_LEN] = { 1510 "rx_queue_0_current", 1511 "tx_queue_0_current", 1512 "rx_queue_0_dirty", 1513 "tx_queue_0_dirty", 1514 "rx_queue_0_packets", 1515 "tx_queue_0_packets", 1516 "rx_queue_0_bytes", 1517 "tx_queue_0_bytes", 1518 "rx_queue_0_mcast_packets", 1519 "rx_queue_0_errors", 1520 "rx_queue_0_crc_errors", 1521 "rx_queue_0_frame_errors", 1522 "rx_queue_0_length_errors", 1523 "rx_queue_0_missed_errors", 1524 "rx_queue_0_over_errors", 1525 1526 "rx_queue_1_current", 1527 "tx_queue_1_current", 1528 "rx_queue_1_dirty", 1529 "tx_queue_1_dirty", 1530 "rx_queue_1_packets", 1531 "tx_queue_1_packets", 1532 "rx_queue_1_bytes", 1533 "tx_queue_1_bytes", 1534 "rx_queue_1_mcast_packets", 1535 "rx_queue_1_errors", 1536 "rx_queue_1_crc_errors", 1537 "rx_queue_1_frame_errors", 1538 "rx_queue_1_length_errors", 1539 "rx_queue_1_missed_errors", 1540 "rx_queue_1_over_errors", 1541 }; 1542 1543 static int ravb_get_sset_count(struct net_device *netdev, int sset) 1544 { 1545 struct ravb_private *priv = netdev_priv(netdev); 1546 const struct ravb_hw_info *info = priv->info; 1547 1548 switch (sset) { 1549 case ETH_SS_STATS: 1550 return info->stats_len; 1551 default: 1552 return -EOPNOTSUPP; 1553 } 1554 } 1555 1556 static void ravb_get_ethtool_stats(struct net_device *ndev, 1557 struct ethtool_stats *estats, u64 *data) 1558 { 1559 struct ravb_private *priv = netdev_priv(ndev); 1560 const struct ravb_hw_info *info = priv->info; 1561 int num_rx_q; 1562 int i = 0; 1563 int q; 1564 1565 num_rx_q = info->nc_queues ? NUM_RX_QUEUE : 1; 1566 /* Device-specific stats */ 1567 for (q = RAVB_BE; q < num_rx_q; q++) { 1568 struct net_device_stats *stats = &priv->stats[q]; 1569 1570 data[i++] = priv->cur_rx[q]; 1571 data[i++] = priv->cur_tx[q]; 1572 data[i++] = priv->dirty_rx[q]; 1573 data[i++] = priv->dirty_tx[q]; 1574 data[i++] = stats->rx_packets; 1575 data[i++] = stats->tx_packets; 1576 data[i++] = stats->rx_bytes; 1577 data[i++] = stats->tx_bytes; 1578 data[i++] = stats->multicast; 1579 data[i++] = stats->rx_errors; 1580 data[i++] = stats->rx_crc_errors; 1581 data[i++] = stats->rx_frame_errors; 1582 data[i++] = stats->rx_length_errors; 1583 data[i++] = stats->rx_missed_errors; 1584 data[i++] = stats->rx_over_errors; 1585 } 1586 } 1587 1588 static void ravb_get_strings(struct net_device *ndev, u32 stringset, u8 *data) 1589 { 1590 struct ravb_private *priv = netdev_priv(ndev); 1591 const struct ravb_hw_info *info = priv->info; 1592 1593 switch (stringset) { 1594 case ETH_SS_STATS: 1595 memcpy(data, info->gstrings_stats, info->gstrings_size); 1596 break; 1597 } 1598 } 1599 1600 static void ravb_get_ringparam(struct net_device *ndev, 1601 struct ethtool_ringparam *ring, 1602 struct kernel_ethtool_ringparam *kernel_ring, 1603 struct netlink_ext_ack *extack) 1604 { 1605 struct ravb_private *priv = netdev_priv(ndev); 1606 1607 ring->rx_max_pending = BE_RX_RING_MAX; 1608 ring->tx_max_pending = BE_TX_RING_MAX; 1609 ring->rx_pending = priv->num_rx_ring[RAVB_BE]; 1610 ring->tx_pending = priv->num_tx_ring[RAVB_BE]; 1611 } 1612 1613 static int ravb_set_ringparam(struct net_device *ndev, 1614 struct ethtool_ringparam *ring, 1615 struct kernel_ethtool_ringparam *kernel_ring, 1616 struct netlink_ext_ack *extack) 1617 { 1618 struct ravb_private *priv = netdev_priv(ndev); 1619 const struct ravb_hw_info *info = priv->info; 1620 int error; 1621 1622 if (ring->tx_pending > BE_TX_RING_MAX || 1623 ring->rx_pending > BE_RX_RING_MAX || 1624 ring->tx_pending < BE_TX_RING_MIN || 1625 ring->rx_pending < BE_RX_RING_MIN) 1626 return -EINVAL; 1627 if (ring->rx_mini_pending || ring->rx_jumbo_pending) 1628 return -EINVAL; 1629 1630 if (netif_running(ndev)) { 1631 netif_device_detach(ndev); 1632 /* Stop PTP Clock driver */ 1633 if (info->gptp) 1634 ravb_ptp_stop(ndev); 1635 /* Wait for DMA stopping */ 1636 error = ravb_stop_dma(ndev); 1637 if (error) { 1638 netdev_err(ndev, 1639 "cannot set ringparam! Any AVB processes are still running?\n"); 1640 return error; 1641 } 1642 synchronize_irq(ndev->irq); 1643 1644 /* Free all the skb's in the RX queue and the DMA buffers. */ 1645 ravb_ring_free(ndev, RAVB_BE); 1646 if (info->nc_queues) 1647 ravb_ring_free(ndev, RAVB_NC); 1648 } 1649 1650 /* Set new parameters */ 1651 priv->num_rx_ring[RAVB_BE] = ring->rx_pending; 1652 priv->num_tx_ring[RAVB_BE] = ring->tx_pending; 1653 1654 if (netif_running(ndev)) { 1655 error = ravb_dmac_init(ndev); 1656 if (error) { 1657 netdev_err(ndev, 1658 "%s: ravb_dmac_init() failed, error %d\n", 1659 __func__, error); 1660 return error; 1661 } 1662 1663 ravb_emac_init(ndev); 1664 1665 /* Initialise PTP Clock driver */ 1666 if (info->gptp) 1667 ravb_ptp_init(ndev, priv->pdev); 1668 1669 netif_device_attach(ndev); 1670 } 1671 1672 return 0; 1673 } 1674 1675 static int ravb_get_ts_info(struct net_device *ndev, 1676 struct ethtool_ts_info *info) 1677 { 1678 struct ravb_private *priv = netdev_priv(ndev); 1679 const struct ravb_hw_info *hw_info = priv->info; 1680 1681 info->so_timestamping = 1682 SOF_TIMESTAMPING_TX_SOFTWARE | 1683 SOF_TIMESTAMPING_RX_SOFTWARE | 1684 SOF_TIMESTAMPING_SOFTWARE | 1685 SOF_TIMESTAMPING_TX_HARDWARE | 1686 SOF_TIMESTAMPING_RX_HARDWARE | 1687 SOF_TIMESTAMPING_RAW_HARDWARE; 1688 info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON); 1689 info->rx_filters = 1690 (1 << HWTSTAMP_FILTER_NONE) | 1691 (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) | 1692 (1 << HWTSTAMP_FILTER_ALL); 1693 if (hw_info->gptp || hw_info->ccc_gac) 1694 info->phc_index = ptp_clock_index(priv->ptp.clock); 1695 1696 return 0; 1697 } 1698 1699 static void ravb_get_wol(struct net_device *ndev, struct ethtool_wolinfo *wol) 1700 { 1701 struct ravb_private *priv = netdev_priv(ndev); 1702 1703 wol->supported = WAKE_MAGIC; 1704 wol->wolopts = priv->wol_enabled ? WAKE_MAGIC : 0; 1705 } 1706 1707 static int ravb_set_wol(struct net_device *ndev, struct ethtool_wolinfo *wol) 1708 { 1709 struct ravb_private *priv = netdev_priv(ndev); 1710 const struct ravb_hw_info *info = priv->info; 1711 1712 if (!info->magic_pkt || (wol->wolopts & ~WAKE_MAGIC)) 1713 return -EOPNOTSUPP; 1714 1715 priv->wol_enabled = !!(wol->wolopts & WAKE_MAGIC); 1716 1717 device_set_wakeup_enable(&priv->pdev->dev, priv->wol_enabled); 1718 1719 return 0; 1720 } 1721 1722 static const struct ethtool_ops ravb_ethtool_ops = { 1723 .nway_reset = phy_ethtool_nway_reset, 1724 .get_msglevel = ravb_get_msglevel, 1725 .set_msglevel = ravb_set_msglevel, 1726 .get_link = ethtool_op_get_link, 1727 .get_strings = ravb_get_strings, 1728 .get_ethtool_stats = ravb_get_ethtool_stats, 1729 .get_sset_count = ravb_get_sset_count, 1730 .get_ringparam = ravb_get_ringparam, 1731 .set_ringparam = ravb_set_ringparam, 1732 .get_ts_info = ravb_get_ts_info, 1733 .get_link_ksettings = phy_ethtool_get_link_ksettings, 1734 .set_link_ksettings = phy_ethtool_set_link_ksettings, 1735 .get_wol = ravb_get_wol, 1736 .set_wol = ravb_set_wol, 1737 }; 1738 1739 static inline int ravb_hook_irq(unsigned int irq, irq_handler_t handler, 1740 struct net_device *ndev, struct device *dev, 1741 const char *ch) 1742 { 1743 char *name; 1744 int error; 1745 1746 name = devm_kasprintf(dev, GFP_KERNEL, "%s:%s", ndev->name, ch); 1747 if (!name) 1748 return -ENOMEM; 1749 error = request_irq(irq, handler, 0, name, ndev); 1750 if (error) 1751 netdev_err(ndev, "cannot request IRQ %s\n", name); 1752 1753 return error; 1754 } 1755 1756 /* Network device open function for Ethernet AVB */ 1757 static int ravb_open(struct net_device *ndev) 1758 { 1759 struct ravb_private *priv = netdev_priv(ndev); 1760 const struct ravb_hw_info *info = priv->info; 1761 struct platform_device *pdev = priv->pdev; 1762 struct device *dev = &pdev->dev; 1763 int error; 1764 1765 napi_enable(&priv->napi[RAVB_BE]); 1766 if (info->nc_queues) 1767 napi_enable(&priv->napi[RAVB_NC]); 1768 1769 if (!info->multi_irqs) { 1770 error = request_irq(ndev->irq, ravb_interrupt, IRQF_SHARED, 1771 ndev->name, ndev); 1772 if (error) { 1773 netdev_err(ndev, "cannot request IRQ\n"); 1774 goto out_napi_off; 1775 } 1776 } else { 1777 error = ravb_hook_irq(ndev->irq, ravb_multi_interrupt, ndev, 1778 dev, "ch22:multi"); 1779 if (error) 1780 goto out_napi_off; 1781 error = ravb_hook_irq(priv->emac_irq, ravb_emac_interrupt, ndev, 1782 dev, "ch24:emac"); 1783 if (error) 1784 goto out_free_irq; 1785 error = ravb_hook_irq(priv->rx_irqs[RAVB_BE], ravb_be_interrupt, 1786 ndev, dev, "ch0:rx_be"); 1787 if (error) 1788 goto out_free_irq_emac; 1789 error = ravb_hook_irq(priv->tx_irqs[RAVB_BE], ravb_be_interrupt, 1790 ndev, dev, "ch18:tx_be"); 1791 if (error) 1792 goto out_free_irq_be_rx; 1793 error = ravb_hook_irq(priv->rx_irqs[RAVB_NC], ravb_nc_interrupt, 1794 ndev, dev, "ch1:rx_nc"); 1795 if (error) 1796 goto out_free_irq_be_tx; 1797 error = ravb_hook_irq(priv->tx_irqs[RAVB_NC], ravb_nc_interrupt, 1798 ndev, dev, "ch19:tx_nc"); 1799 if (error) 1800 goto out_free_irq_nc_rx; 1801 1802 if (info->err_mgmt_irqs) { 1803 error = ravb_hook_irq(priv->erra_irq, ravb_multi_interrupt, 1804 ndev, dev, "err_a"); 1805 if (error) 1806 goto out_free_irq_nc_tx; 1807 error = ravb_hook_irq(priv->mgmta_irq, ravb_multi_interrupt, 1808 ndev, dev, "mgmt_a"); 1809 if (error) 1810 goto out_free_irq_erra; 1811 } 1812 } 1813 1814 /* Device init */ 1815 error = ravb_dmac_init(ndev); 1816 if (error) 1817 goto out_free_irq_mgmta; 1818 ravb_emac_init(ndev); 1819 1820 /* Initialise PTP Clock driver */ 1821 if (info->gptp) 1822 ravb_ptp_init(ndev, priv->pdev); 1823 1824 netif_tx_start_all_queues(ndev); 1825 1826 /* PHY control start */ 1827 error = ravb_phy_start(ndev); 1828 if (error) 1829 goto out_ptp_stop; 1830 1831 return 0; 1832 1833 out_ptp_stop: 1834 /* Stop PTP Clock driver */ 1835 if (info->gptp) 1836 ravb_ptp_stop(ndev); 1837 out_free_irq_mgmta: 1838 if (!info->multi_irqs) 1839 goto out_free_irq; 1840 if (info->err_mgmt_irqs) 1841 free_irq(priv->mgmta_irq, ndev); 1842 out_free_irq_erra: 1843 if (info->err_mgmt_irqs) 1844 free_irq(priv->erra_irq, ndev); 1845 out_free_irq_nc_tx: 1846 free_irq(priv->tx_irqs[RAVB_NC], ndev); 1847 out_free_irq_nc_rx: 1848 free_irq(priv->rx_irqs[RAVB_NC], ndev); 1849 out_free_irq_be_tx: 1850 free_irq(priv->tx_irqs[RAVB_BE], ndev); 1851 out_free_irq_be_rx: 1852 free_irq(priv->rx_irqs[RAVB_BE], ndev); 1853 out_free_irq_emac: 1854 free_irq(priv->emac_irq, ndev); 1855 out_free_irq: 1856 free_irq(ndev->irq, ndev); 1857 out_napi_off: 1858 if (info->nc_queues) 1859 napi_disable(&priv->napi[RAVB_NC]); 1860 napi_disable(&priv->napi[RAVB_BE]); 1861 return error; 1862 } 1863 1864 /* Timeout function for Ethernet AVB */ 1865 static void ravb_tx_timeout(struct net_device *ndev, unsigned int txqueue) 1866 { 1867 struct ravb_private *priv = netdev_priv(ndev); 1868 1869 netif_err(priv, tx_err, ndev, 1870 "transmit timed out, status %08x, resetting...\n", 1871 ravb_read(ndev, ISS)); 1872 1873 /* tx_errors count up */ 1874 ndev->stats.tx_errors++; 1875 1876 schedule_work(&priv->work); 1877 } 1878 1879 static void ravb_tx_timeout_work(struct work_struct *work) 1880 { 1881 struct ravb_private *priv = container_of(work, struct ravb_private, 1882 work); 1883 const struct ravb_hw_info *info = priv->info; 1884 struct net_device *ndev = priv->ndev; 1885 int error; 1886 1887 netif_tx_stop_all_queues(ndev); 1888 1889 /* Stop PTP Clock driver */ 1890 if (info->gptp) 1891 ravb_ptp_stop(ndev); 1892 1893 /* Wait for DMA stopping */ 1894 if (ravb_stop_dma(ndev)) { 1895 /* If ravb_stop_dma() fails, the hardware is still operating 1896 * for TX and/or RX. So, this should not call the following 1897 * functions because ravb_dmac_init() is possible to fail too. 1898 * Also, this should not retry ravb_stop_dma() again and again 1899 * here because it's possible to wait forever. So, this just 1900 * re-enables the TX and RX and skip the following 1901 * re-initialization procedure. 1902 */ 1903 ravb_rcv_snd_enable(ndev); 1904 goto out; 1905 } 1906 1907 ravb_ring_free(ndev, RAVB_BE); 1908 if (info->nc_queues) 1909 ravb_ring_free(ndev, RAVB_NC); 1910 1911 /* Device init */ 1912 error = ravb_dmac_init(ndev); 1913 if (error) { 1914 /* If ravb_dmac_init() fails, descriptors are freed. So, this 1915 * should return here to avoid re-enabling the TX and RX in 1916 * ravb_emac_init(). 1917 */ 1918 netdev_err(ndev, "%s: ravb_dmac_init() failed, error %d\n", 1919 __func__, error); 1920 return; 1921 } 1922 ravb_emac_init(ndev); 1923 1924 out: 1925 /* Initialise PTP Clock driver */ 1926 if (info->gptp) 1927 ravb_ptp_init(ndev, priv->pdev); 1928 1929 netif_tx_start_all_queues(ndev); 1930 } 1931 1932 /* Packet transmit function for Ethernet AVB */ 1933 static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev) 1934 { 1935 struct ravb_private *priv = netdev_priv(ndev); 1936 const struct ravb_hw_info *info = priv->info; 1937 unsigned int num_tx_desc = priv->num_tx_desc; 1938 u16 q = skb_get_queue_mapping(skb); 1939 struct ravb_tstamp_skb *ts_skb; 1940 struct ravb_tx_desc *desc; 1941 unsigned long flags; 1942 u32 dma_addr; 1943 void *buffer; 1944 u32 entry; 1945 u32 len; 1946 1947 spin_lock_irqsave(&priv->lock, flags); 1948 if (priv->cur_tx[q] - priv->dirty_tx[q] > (priv->num_tx_ring[q] - 1) * 1949 num_tx_desc) { 1950 netif_err(priv, tx_queued, ndev, 1951 "still transmitting with the full ring!\n"); 1952 netif_stop_subqueue(ndev, q); 1953 spin_unlock_irqrestore(&priv->lock, flags); 1954 return NETDEV_TX_BUSY; 1955 } 1956 1957 if (skb_put_padto(skb, ETH_ZLEN)) 1958 goto exit; 1959 1960 entry = priv->cur_tx[q] % (priv->num_tx_ring[q] * num_tx_desc); 1961 priv->tx_skb[q][entry / num_tx_desc] = skb; 1962 1963 if (num_tx_desc > 1) { 1964 buffer = PTR_ALIGN(priv->tx_align[q], DPTR_ALIGN) + 1965 entry / num_tx_desc * DPTR_ALIGN; 1966 len = PTR_ALIGN(skb->data, DPTR_ALIGN) - skb->data; 1967 1968 /* Zero length DMA descriptors are problematic as they seem 1969 * to terminate DMA transfers. Avoid them by simply using a 1970 * length of DPTR_ALIGN (4) when skb data is aligned to 1971 * DPTR_ALIGN. 1972 * 1973 * As skb is guaranteed to have at least ETH_ZLEN (60) 1974 * bytes of data by the call to skb_put_padto() above this 1975 * is safe with respect to both the length of the first DMA 1976 * descriptor (len) overflowing the available data and the 1977 * length of the second DMA descriptor (skb->len - len) 1978 * being negative. 1979 */ 1980 if (len == 0) 1981 len = DPTR_ALIGN; 1982 1983 memcpy(buffer, skb->data, len); 1984 dma_addr = dma_map_single(ndev->dev.parent, buffer, len, 1985 DMA_TO_DEVICE); 1986 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 1987 goto drop; 1988 1989 desc = &priv->tx_ring[q][entry]; 1990 desc->ds_tagl = cpu_to_le16(len); 1991 desc->dptr = cpu_to_le32(dma_addr); 1992 1993 buffer = skb->data + len; 1994 len = skb->len - len; 1995 dma_addr = dma_map_single(ndev->dev.parent, buffer, len, 1996 DMA_TO_DEVICE); 1997 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 1998 goto unmap; 1999 2000 desc++; 2001 } else { 2002 desc = &priv->tx_ring[q][entry]; 2003 len = skb->len; 2004 dma_addr = dma_map_single(ndev->dev.parent, skb->data, skb->len, 2005 DMA_TO_DEVICE); 2006 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 2007 goto drop; 2008 } 2009 desc->ds_tagl = cpu_to_le16(len); 2010 desc->dptr = cpu_to_le32(dma_addr); 2011 2012 /* TX timestamp required */ 2013 if (info->gptp || info->ccc_gac) { 2014 if (q == RAVB_NC) { 2015 ts_skb = kmalloc(sizeof(*ts_skb), GFP_ATOMIC); 2016 if (!ts_skb) { 2017 if (num_tx_desc > 1) { 2018 desc--; 2019 dma_unmap_single(ndev->dev.parent, dma_addr, 2020 len, DMA_TO_DEVICE); 2021 } 2022 goto unmap; 2023 } 2024 ts_skb->skb = skb_get(skb); 2025 ts_skb->tag = priv->ts_skb_tag++; 2026 priv->ts_skb_tag &= 0x3ff; 2027 list_add_tail(&ts_skb->list, &priv->ts_skb_list); 2028 2029 /* TAG and timestamp required flag */ 2030 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; 2031 desc->tagh_tsr = (ts_skb->tag >> 4) | TX_TSR; 2032 desc->ds_tagl |= cpu_to_le16(ts_skb->tag << 12); 2033 } 2034 2035 skb_tx_timestamp(skb); 2036 } 2037 /* Descriptor type must be set after all the above writes */ 2038 dma_wmb(); 2039 if (num_tx_desc > 1) { 2040 desc->die_dt = DT_FEND; 2041 desc--; 2042 desc->die_dt = DT_FSTART; 2043 } else { 2044 desc->die_dt = DT_FSINGLE; 2045 } 2046 ravb_modify(ndev, TCCR, TCCR_TSRQ0 << q, TCCR_TSRQ0 << q); 2047 2048 priv->cur_tx[q] += num_tx_desc; 2049 if (priv->cur_tx[q] - priv->dirty_tx[q] > 2050 (priv->num_tx_ring[q] - 1) * num_tx_desc && 2051 !ravb_tx_free(ndev, q, true)) 2052 netif_stop_subqueue(ndev, q); 2053 2054 exit: 2055 spin_unlock_irqrestore(&priv->lock, flags); 2056 return NETDEV_TX_OK; 2057 2058 unmap: 2059 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr), 2060 le16_to_cpu(desc->ds_tagl), DMA_TO_DEVICE); 2061 drop: 2062 dev_kfree_skb_any(skb); 2063 priv->tx_skb[q][entry / num_tx_desc] = NULL; 2064 goto exit; 2065 } 2066 2067 static u16 ravb_select_queue(struct net_device *ndev, struct sk_buff *skb, 2068 struct net_device *sb_dev) 2069 { 2070 /* If skb needs TX timestamp, it is handled in network control queue */ 2071 return (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ? RAVB_NC : 2072 RAVB_BE; 2073 2074 } 2075 2076 static struct net_device_stats *ravb_get_stats(struct net_device *ndev) 2077 { 2078 struct ravb_private *priv = netdev_priv(ndev); 2079 const struct ravb_hw_info *info = priv->info; 2080 struct net_device_stats *nstats, *stats0, *stats1; 2081 2082 nstats = &ndev->stats; 2083 stats0 = &priv->stats[RAVB_BE]; 2084 2085 if (info->tx_counters) { 2086 nstats->tx_dropped += ravb_read(ndev, TROCR); 2087 ravb_write(ndev, 0, TROCR); /* (write clear) */ 2088 } 2089 2090 if (info->carrier_counters) { 2091 nstats->collisions += ravb_read(ndev, CXR41); 2092 ravb_write(ndev, 0, CXR41); /* (write clear) */ 2093 nstats->tx_carrier_errors += ravb_read(ndev, CXR42); 2094 ravb_write(ndev, 0, CXR42); /* (write clear) */ 2095 } 2096 2097 nstats->rx_packets = stats0->rx_packets; 2098 nstats->tx_packets = stats0->tx_packets; 2099 nstats->rx_bytes = stats0->rx_bytes; 2100 nstats->tx_bytes = stats0->tx_bytes; 2101 nstats->multicast = stats0->multicast; 2102 nstats->rx_errors = stats0->rx_errors; 2103 nstats->rx_crc_errors = stats0->rx_crc_errors; 2104 nstats->rx_frame_errors = stats0->rx_frame_errors; 2105 nstats->rx_length_errors = stats0->rx_length_errors; 2106 nstats->rx_missed_errors = stats0->rx_missed_errors; 2107 nstats->rx_over_errors = stats0->rx_over_errors; 2108 if (info->nc_queues) { 2109 stats1 = &priv->stats[RAVB_NC]; 2110 2111 nstats->rx_packets += stats1->rx_packets; 2112 nstats->tx_packets += stats1->tx_packets; 2113 nstats->rx_bytes += stats1->rx_bytes; 2114 nstats->tx_bytes += stats1->tx_bytes; 2115 nstats->multicast += stats1->multicast; 2116 nstats->rx_errors += stats1->rx_errors; 2117 nstats->rx_crc_errors += stats1->rx_crc_errors; 2118 nstats->rx_frame_errors += stats1->rx_frame_errors; 2119 nstats->rx_length_errors += stats1->rx_length_errors; 2120 nstats->rx_missed_errors += stats1->rx_missed_errors; 2121 nstats->rx_over_errors += stats1->rx_over_errors; 2122 } 2123 2124 return nstats; 2125 } 2126 2127 /* Update promiscuous bit */ 2128 static void ravb_set_rx_mode(struct net_device *ndev) 2129 { 2130 struct ravb_private *priv = netdev_priv(ndev); 2131 unsigned long flags; 2132 2133 spin_lock_irqsave(&priv->lock, flags); 2134 ravb_modify(ndev, ECMR, ECMR_PRM, 2135 ndev->flags & IFF_PROMISC ? ECMR_PRM : 0); 2136 spin_unlock_irqrestore(&priv->lock, flags); 2137 } 2138 2139 /* Device close function for Ethernet AVB */ 2140 static int ravb_close(struct net_device *ndev) 2141 { 2142 struct device_node *np = ndev->dev.parent->of_node; 2143 struct ravb_private *priv = netdev_priv(ndev); 2144 const struct ravb_hw_info *info = priv->info; 2145 struct ravb_tstamp_skb *ts_skb, *ts_skb2; 2146 2147 netif_tx_stop_all_queues(ndev); 2148 2149 /* Disable interrupts by clearing the interrupt masks. */ 2150 ravb_write(ndev, 0, RIC0); 2151 ravb_write(ndev, 0, RIC2); 2152 ravb_write(ndev, 0, TIC); 2153 2154 /* Stop PTP Clock driver */ 2155 if (info->gptp) 2156 ravb_ptp_stop(ndev); 2157 2158 /* Set the config mode to stop the AVB-DMAC's processes */ 2159 if (ravb_stop_dma(ndev) < 0) 2160 netdev_err(ndev, 2161 "device will be stopped after h/w processes are done.\n"); 2162 2163 /* Clear the timestamp list */ 2164 if (info->gptp || info->ccc_gac) { 2165 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, list) { 2166 list_del(&ts_skb->list); 2167 kfree_skb(ts_skb->skb); 2168 kfree(ts_skb); 2169 } 2170 } 2171 2172 /* PHY disconnect */ 2173 if (ndev->phydev) { 2174 phy_stop(ndev->phydev); 2175 phy_disconnect(ndev->phydev); 2176 if (of_phy_is_fixed_link(np)) 2177 of_phy_deregister_fixed_link(np); 2178 } 2179 2180 if (info->multi_irqs) { 2181 free_irq(priv->tx_irqs[RAVB_NC], ndev); 2182 free_irq(priv->rx_irqs[RAVB_NC], ndev); 2183 free_irq(priv->tx_irqs[RAVB_BE], ndev); 2184 free_irq(priv->rx_irqs[RAVB_BE], ndev); 2185 free_irq(priv->emac_irq, ndev); 2186 if (info->err_mgmt_irqs) { 2187 free_irq(priv->erra_irq, ndev); 2188 free_irq(priv->mgmta_irq, ndev); 2189 } 2190 } 2191 free_irq(ndev->irq, ndev); 2192 2193 if (info->nc_queues) 2194 napi_disable(&priv->napi[RAVB_NC]); 2195 napi_disable(&priv->napi[RAVB_BE]); 2196 2197 /* Free all the skb's in the RX queue and the DMA buffers. */ 2198 ravb_ring_free(ndev, RAVB_BE); 2199 if (info->nc_queues) 2200 ravb_ring_free(ndev, RAVB_NC); 2201 2202 return 0; 2203 } 2204 2205 static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req) 2206 { 2207 struct ravb_private *priv = netdev_priv(ndev); 2208 struct hwtstamp_config config; 2209 2210 config.flags = 0; 2211 config.tx_type = priv->tstamp_tx_ctrl ? HWTSTAMP_TX_ON : 2212 HWTSTAMP_TX_OFF; 2213 switch (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE) { 2214 case RAVB_RXTSTAMP_TYPE_V2_L2_EVENT: 2215 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT; 2216 break; 2217 case RAVB_RXTSTAMP_TYPE_ALL: 2218 config.rx_filter = HWTSTAMP_FILTER_ALL; 2219 break; 2220 default: 2221 config.rx_filter = HWTSTAMP_FILTER_NONE; 2222 } 2223 2224 return copy_to_user(req->ifr_data, &config, sizeof(config)) ? 2225 -EFAULT : 0; 2226 } 2227 2228 /* Control hardware time stamping */ 2229 static int ravb_hwtstamp_set(struct net_device *ndev, struct ifreq *req) 2230 { 2231 struct ravb_private *priv = netdev_priv(ndev); 2232 struct hwtstamp_config config; 2233 u32 tstamp_rx_ctrl = RAVB_RXTSTAMP_ENABLED; 2234 u32 tstamp_tx_ctrl; 2235 2236 if (copy_from_user(&config, req->ifr_data, sizeof(config))) 2237 return -EFAULT; 2238 2239 switch (config.tx_type) { 2240 case HWTSTAMP_TX_OFF: 2241 tstamp_tx_ctrl = 0; 2242 break; 2243 case HWTSTAMP_TX_ON: 2244 tstamp_tx_ctrl = RAVB_TXTSTAMP_ENABLED; 2245 break; 2246 default: 2247 return -ERANGE; 2248 } 2249 2250 switch (config.rx_filter) { 2251 case HWTSTAMP_FILTER_NONE: 2252 tstamp_rx_ctrl = 0; 2253 break; 2254 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 2255 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_V2_L2_EVENT; 2256 break; 2257 default: 2258 config.rx_filter = HWTSTAMP_FILTER_ALL; 2259 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_ALL; 2260 } 2261 2262 priv->tstamp_tx_ctrl = tstamp_tx_ctrl; 2263 priv->tstamp_rx_ctrl = tstamp_rx_ctrl; 2264 2265 return copy_to_user(req->ifr_data, &config, sizeof(config)) ? 2266 -EFAULT : 0; 2267 } 2268 2269 /* ioctl to device function */ 2270 static int ravb_do_ioctl(struct net_device *ndev, struct ifreq *req, int cmd) 2271 { 2272 struct phy_device *phydev = ndev->phydev; 2273 2274 if (!netif_running(ndev)) 2275 return -EINVAL; 2276 2277 if (!phydev) 2278 return -ENODEV; 2279 2280 switch (cmd) { 2281 case SIOCGHWTSTAMP: 2282 return ravb_hwtstamp_get(ndev, req); 2283 case SIOCSHWTSTAMP: 2284 return ravb_hwtstamp_set(ndev, req); 2285 } 2286 2287 return phy_mii_ioctl(phydev, req, cmd); 2288 } 2289 2290 static int ravb_change_mtu(struct net_device *ndev, int new_mtu) 2291 { 2292 struct ravb_private *priv = netdev_priv(ndev); 2293 2294 ndev->mtu = new_mtu; 2295 2296 if (netif_running(ndev)) { 2297 synchronize_irq(priv->emac_irq); 2298 ravb_emac_init(ndev); 2299 } 2300 2301 netdev_update_features(ndev); 2302 2303 return 0; 2304 } 2305 2306 static void ravb_set_rx_csum(struct net_device *ndev, bool enable) 2307 { 2308 struct ravb_private *priv = netdev_priv(ndev); 2309 unsigned long flags; 2310 2311 spin_lock_irqsave(&priv->lock, flags); 2312 2313 /* Disable TX and RX */ 2314 ravb_rcv_snd_disable(ndev); 2315 2316 /* Modify RX Checksum setting */ 2317 ravb_modify(ndev, ECMR, ECMR_RCSC, enable ? ECMR_RCSC : 0); 2318 2319 /* Enable TX and RX */ 2320 ravb_rcv_snd_enable(ndev); 2321 2322 spin_unlock_irqrestore(&priv->lock, flags); 2323 } 2324 2325 static int ravb_set_features_gbeth(struct net_device *ndev, 2326 netdev_features_t features) 2327 { 2328 /* Place holder */ 2329 return 0; 2330 } 2331 2332 static int ravb_set_features_rcar(struct net_device *ndev, 2333 netdev_features_t features) 2334 { 2335 netdev_features_t changed = ndev->features ^ features; 2336 2337 if (changed & NETIF_F_RXCSUM) 2338 ravb_set_rx_csum(ndev, features & NETIF_F_RXCSUM); 2339 2340 ndev->features = features; 2341 2342 return 0; 2343 } 2344 2345 static int ravb_set_features(struct net_device *ndev, 2346 netdev_features_t features) 2347 { 2348 struct ravb_private *priv = netdev_priv(ndev); 2349 const struct ravb_hw_info *info = priv->info; 2350 2351 return info->set_feature(ndev, features); 2352 } 2353 2354 static const struct net_device_ops ravb_netdev_ops = { 2355 .ndo_open = ravb_open, 2356 .ndo_stop = ravb_close, 2357 .ndo_start_xmit = ravb_start_xmit, 2358 .ndo_select_queue = ravb_select_queue, 2359 .ndo_get_stats = ravb_get_stats, 2360 .ndo_set_rx_mode = ravb_set_rx_mode, 2361 .ndo_tx_timeout = ravb_tx_timeout, 2362 .ndo_eth_ioctl = ravb_do_ioctl, 2363 .ndo_change_mtu = ravb_change_mtu, 2364 .ndo_validate_addr = eth_validate_addr, 2365 .ndo_set_mac_address = eth_mac_addr, 2366 .ndo_set_features = ravb_set_features, 2367 }; 2368 2369 /* MDIO bus init function */ 2370 static int ravb_mdio_init(struct ravb_private *priv) 2371 { 2372 struct platform_device *pdev = priv->pdev; 2373 struct device *dev = &pdev->dev; 2374 int error; 2375 2376 /* Bitbang init */ 2377 priv->mdiobb.ops = &bb_ops; 2378 2379 /* MII controller setting */ 2380 priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb); 2381 if (!priv->mii_bus) 2382 return -ENOMEM; 2383 2384 /* Hook up MII support for ethtool */ 2385 priv->mii_bus->name = "ravb_mii"; 2386 priv->mii_bus->parent = dev; 2387 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x", 2388 pdev->name, pdev->id); 2389 2390 /* Register MDIO bus */ 2391 error = of_mdiobus_register(priv->mii_bus, dev->of_node); 2392 if (error) 2393 goto out_free_bus; 2394 2395 return 0; 2396 2397 out_free_bus: 2398 free_mdio_bitbang(priv->mii_bus); 2399 return error; 2400 } 2401 2402 /* MDIO bus release function */ 2403 static int ravb_mdio_release(struct ravb_private *priv) 2404 { 2405 /* Unregister mdio bus */ 2406 mdiobus_unregister(priv->mii_bus); 2407 2408 /* Free bitbang info */ 2409 free_mdio_bitbang(priv->mii_bus); 2410 2411 return 0; 2412 } 2413 2414 static const struct ravb_hw_info ravb_gen3_hw_info = { 2415 .rx_ring_free = ravb_rx_ring_free_rcar, 2416 .rx_ring_format = ravb_rx_ring_format_rcar, 2417 .alloc_rx_desc = ravb_alloc_rx_desc_rcar, 2418 .receive = ravb_rx_rcar, 2419 .set_rate = ravb_set_rate_rcar, 2420 .set_feature = ravb_set_features_rcar, 2421 .dmac_init = ravb_dmac_init_rcar, 2422 .emac_init = ravb_emac_init_rcar, 2423 .gstrings_stats = ravb_gstrings_stats, 2424 .gstrings_size = sizeof(ravb_gstrings_stats), 2425 .net_hw_features = NETIF_F_RXCSUM, 2426 .net_features = NETIF_F_RXCSUM, 2427 .stats_len = ARRAY_SIZE(ravb_gstrings_stats), 2428 .max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1, 2429 .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 2430 .rx_max_buf_size = SZ_2K, 2431 .internal_delay = 1, 2432 .tx_counters = 1, 2433 .multi_irqs = 1, 2434 .irq_en_dis = 1, 2435 .ccc_gac = 1, 2436 .nc_queues = 1, 2437 .magic_pkt = 1, 2438 }; 2439 2440 static const struct ravb_hw_info ravb_gen2_hw_info = { 2441 .rx_ring_free = ravb_rx_ring_free_rcar, 2442 .rx_ring_format = ravb_rx_ring_format_rcar, 2443 .alloc_rx_desc = ravb_alloc_rx_desc_rcar, 2444 .receive = ravb_rx_rcar, 2445 .set_rate = ravb_set_rate_rcar, 2446 .set_feature = ravb_set_features_rcar, 2447 .dmac_init = ravb_dmac_init_rcar, 2448 .emac_init = ravb_emac_init_rcar, 2449 .gstrings_stats = ravb_gstrings_stats, 2450 .gstrings_size = sizeof(ravb_gstrings_stats), 2451 .net_hw_features = NETIF_F_RXCSUM, 2452 .net_features = NETIF_F_RXCSUM, 2453 .stats_len = ARRAY_SIZE(ravb_gstrings_stats), 2454 .max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1, 2455 .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 2456 .rx_max_buf_size = SZ_2K, 2457 .aligned_tx = 1, 2458 .gptp = 1, 2459 .nc_queues = 1, 2460 .magic_pkt = 1, 2461 }; 2462 2463 static const struct ravb_hw_info ravb_rzv2m_hw_info = { 2464 .rx_ring_free = ravb_rx_ring_free_rcar, 2465 .rx_ring_format = ravb_rx_ring_format_rcar, 2466 .alloc_rx_desc = ravb_alloc_rx_desc_rcar, 2467 .receive = ravb_rx_rcar, 2468 .set_rate = ravb_set_rate_rcar, 2469 .set_feature = ravb_set_features_rcar, 2470 .dmac_init = ravb_dmac_init_rcar, 2471 .emac_init = ravb_emac_init_rcar, 2472 .gstrings_stats = ravb_gstrings_stats, 2473 .gstrings_size = sizeof(ravb_gstrings_stats), 2474 .net_hw_features = NETIF_F_RXCSUM, 2475 .net_features = NETIF_F_RXCSUM, 2476 .stats_len = ARRAY_SIZE(ravb_gstrings_stats), 2477 .max_rx_len = RX_BUF_SZ + RAVB_ALIGN - 1, 2478 .tccr_mask = TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 2479 .rx_max_buf_size = SZ_2K, 2480 .multi_irqs = 1, 2481 .err_mgmt_irqs = 1, 2482 .gptp = 1, 2483 .gptp_ref_clk = 1, 2484 .nc_queues = 1, 2485 .magic_pkt = 1, 2486 }; 2487 2488 static const struct ravb_hw_info gbeth_hw_info = { 2489 .rx_ring_free = ravb_rx_ring_free_gbeth, 2490 .rx_ring_format = ravb_rx_ring_format_gbeth, 2491 .alloc_rx_desc = ravb_alloc_rx_desc_gbeth, 2492 .receive = ravb_rx_gbeth, 2493 .set_rate = ravb_set_rate_gbeth, 2494 .set_feature = ravb_set_features_gbeth, 2495 .dmac_init = ravb_dmac_init_gbeth, 2496 .emac_init = ravb_emac_init_gbeth, 2497 .gstrings_stats = ravb_gstrings_stats_gbeth, 2498 .gstrings_size = sizeof(ravb_gstrings_stats_gbeth), 2499 .stats_len = ARRAY_SIZE(ravb_gstrings_stats_gbeth), 2500 .max_rx_len = ALIGN(GBETH_RX_BUFF_MAX, RAVB_ALIGN), 2501 .tccr_mask = TCCR_TSRQ0, 2502 .rx_max_buf_size = SZ_8K, 2503 .aligned_tx = 1, 2504 .tx_counters = 1, 2505 .carrier_counters = 1, 2506 .half_duplex = 1, 2507 }; 2508 2509 static const struct of_device_id ravb_match_table[] = { 2510 { .compatible = "renesas,etheravb-r8a7790", .data = &ravb_gen2_hw_info }, 2511 { .compatible = "renesas,etheravb-r8a7794", .data = &ravb_gen2_hw_info }, 2512 { .compatible = "renesas,etheravb-rcar-gen2", .data = &ravb_gen2_hw_info }, 2513 { .compatible = "renesas,etheravb-r8a7795", .data = &ravb_gen3_hw_info }, 2514 { .compatible = "renesas,etheravb-rcar-gen3", .data = &ravb_gen3_hw_info }, 2515 { .compatible = "renesas,etheravb-rcar-gen4", .data = &ravb_gen3_hw_info }, 2516 { .compatible = "renesas,etheravb-rzv2m", .data = &ravb_rzv2m_hw_info }, 2517 { .compatible = "renesas,rzg2l-gbeth", .data = &gbeth_hw_info }, 2518 { } 2519 }; 2520 MODULE_DEVICE_TABLE(of, ravb_match_table); 2521 2522 static int ravb_set_gti(struct net_device *ndev) 2523 { 2524 struct ravb_private *priv = netdev_priv(ndev); 2525 const struct ravb_hw_info *info = priv->info; 2526 struct device *dev = ndev->dev.parent; 2527 unsigned long rate; 2528 uint64_t inc; 2529 2530 if (info->gptp_ref_clk) 2531 rate = clk_get_rate(priv->gptp_clk); 2532 else 2533 rate = clk_get_rate(priv->clk); 2534 if (!rate) 2535 return -EINVAL; 2536 2537 inc = div64_ul(1000000000ULL << 20, rate); 2538 2539 if (inc < GTI_TIV_MIN || inc > GTI_TIV_MAX) { 2540 dev_err(dev, "gti.tiv increment 0x%llx is outside the range 0x%x - 0x%x\n", 2541 inc, GTI_TIV_MIN, GTI_TIV_MAX); 2542 return -EINVAL; 2543 } 2544 2545 ravb_write(ndev, inc, GTI); 2546 2547 return 0; 2548 } 2549 2550 static void ravb_set_config_mode(struct net_device *ndev) 2551 { 2552 struct ravb_private *priv = netdev_priv(ndev); 2553 const struct ravb_hw_info *info = priv->info; 2554 2555 if (info->gptp) { 2556 ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG); 2557 /* Set CSEL value */ 2558 ravb_modify(ndev, CCC, CCC_CSEL, CCC_CSEL_HPB); 2559 } else if (info->ccc_gac) { 2560 ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG | 2561 CCC_GAC | CCC_CSEL_HPB); 2562 } else { 2563 ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_CONFIG); 2564 } 2565 } 2566 2567 /* Set tx and rx clock internal delay modes */ 2568 static void ravb_parse_delay_mode(struct device_node *np, struct net_device *ndev) 2569 { 2570 struct ravb_private *priv = netdev_priv(ndev); 2571 bool explicit_delay = false; 2572 u32 delay; 2573 2574 if (!of_property_read_u32(np, "rx-internal-delay-ps", &delay)) { 2575 /* Valid values are 0 and 1800, according to DT bindings */ 2576 priv->rxcidm = !!delay; 2577 explicit_delay = true; 2578 } 2579 if (!of_property_read_u32(np, "tx-internal-delay-ps", &delay)) { 2580 /* Valid values are 0 and 2000, according to DT bindings */ 2581 priv->txcidm = !!delay; 2582 explicit_delay = true; 2583 } 2584 2585 if (explicit_delay) 2586 return; 2587 2588 /* Fall back to legacy rgmii-*id behavior */ 2589 if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID || 2590 priv->phy_interface == PHY_INTERFACE_MODE_RGMII_RXID) { 2591 priv->rxcidm = 1; 2592 priv->rgmii_override = 1; 2593 } 2594 2595 if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID || 2596 priv->phy_interface == PHY_INTERFACE_MODE_RGMII_TXID) { 2597 priv->txcidm = 1; 2598 priv->rgmii_override = 1; 2599 } 2600 } 2601 2602 static void ravb_set_delay_mode(struct net_device *ndev) 2603 { 2604 struct ravb_private *priv = netdev_priv(ndev); 2605 u32 set = 0; 2606 2607 if (priv->rxcidm) 2608 set |= APSR_RDM; 2609 if (priv->txcidm) 2610 set |= APSR_TDM; 2611 ravb_modify(ndev, APSR, APSR_RDM | APSR_TDM, set); 2612 } 2613 2614 static int ravb_probe(struct platform_device *pdev) 2615 { 2616 struct device_node *np = pdev->dev.of_node; 2617 const struct ravb_hw_info *info; 2618 struct reset_control *rstc; 2619 struct ravb_private *priv; 2620 struct net_device *ndev; 2621 int error, irq, q; 2622 struct resource *res; 2623 int i; 2624 2625 if (!np) { 2626 dev_err(&pdev->dev, 2627 "this driver is required to be instantiated from device tree\n"); 2628 return -EINVAL; 2629 } 2630 2631 rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL); 2632 if (IS_ERR(rstc)) 2633 return dev_err_probe(&pdev->dev, PTR_ERR(rstc), 2634 "failed to get cpg reset\n"); 2635 2636 ndev = alloc_etherdev_mqs(sizeof(struct ravb_private), 2637 NUM_TX_QUEUE, NUM_RX_QUEUE); 2638 if (!ndev) 2639 return -ENOMEM; 2640 2641 info = of_device_get_match_data(&pdev->dev); 2642 2643 ndev->features = info->net_features; 2644 ndev->hw_features = info->net_hw_features; 2645 2646 reset_control_deassert(rstc); 2647 pm_runtime_enable(&pdev->dev); 2648 pm_runtime_get_sync(&pdev->dev); 2649 2650 if (info->multi_irqs) { 2651 if (info->err_mgmt_irqs) 2652 irq = platform_get_irq_byname(pdev, "dia"); 2653 else 2654 irq = platform_get_irq_byname(pdev, "ch22"); 2655 } else { 2656 irq = platform_get_irq(pdev, 0); 2657 } 2658 if (irq < 0) { 2659 error = irq; 2660 goto out_release; 2661 } 2662 ndev->irq = irq; 2663 2664 SET_NETDEV_DEV(ndev, &pdev->dev); 2665 2666 priv = netdev_priv(ndev); 2667 priv->info = info; 2668 priv->rstc = rstc; 2669 priv->ndev = ndev; 2670 priv->pdev = pdev; 2671 priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE; 2672 priv->num_rx_ring[RAVB_BE] = BE_RX_RING_SIZE; 2673 if (info->nc_queues) { 2674 priv->num_tx_ring[RAVB_NC] = NC_TX_RING_SIZE; 2675 priv->num_rx_ring[RAVB_NC] = NC_RX_RING_SIZE; 2676 } 2677 2678 priv->addr = devm_platform_get_and_ioremap_resource(pdev, 0, &res); 2679 if (IS_ERR(priv->addr)) { 2680 error = PTR_ERR(priv->addr); 2681 goto out_release; 2682 } 2683 2684 /* The Ether-specific entries in the device structure. */ 2685 ndev->base_addr = res->start; 2686 2687 spin_lock_init(&priv->lock); 2688 INIT_WORK(&priv->work, ravb_tx_timeout_work); 2689 2690 error = of_get_phy_mode(np, &priv->phy_interface); 2691 if (error && error != -ENODEV) 2692 goto out_release; 2693 2694 priv->no_avb_link = of_property_read_bool(np, "renesas,no-ether-link"); 2695 priv->avb_link_active_low = 2696 of_property_read_bool(np, "renesas,ether-link-active-low"); 2697 2698 if (info->multi_irqs) { 2699 if (info->err_mgmt_irqs) 2700 irq = platform_get_irq_byname(pdev, "line3"); 2701 else 2702 irq = platform_get_irq_byname(pdev, "ch24"); 2703 if (irq < 0) { 2704 error = irq; 2705 goto out_release; 2706 } 2707 priv->emac_irq = irq; 2708 for (i = 0; i < NUM_RX_QUEUE; i++) { 2709 irq = platform_get_irq_byname(pdev, ravb_rx_irqs[i]); 2710 if (irq < 0) { 2711 error = irq; 2712 goto out_release; 2713 } 2714 priv->rx_irqs[i] = irq; 2715 } 2716 for (i = 0; i < NUM_TX_QUEUE; i++) { 2717 irq = platform_get_irq_byname(pdev, ravb_tx_irqs[i]); 2718 if (irq < 0) { 2719 error = irq; 2720 goto out_release; 2721 } 2722 priv->tx_irqs[i] = irq; 2723 } 2724 2725 if (info->err_mgmt_irqs) { 2726 irq = platform_get_irq_byname(pdev, "err_a"); 2727 if (irq < 0) { 2728 error = irq; 2729 goto out_release; 2730 } 2731 priv->erra_irq = irq; 2732 2733 irq = platform_get_irq_byname(pdev, "mgmt_a"); 2734 if (irq < 0) { 2735 error = irq; 2736 goto out_release; 2737 } 2738 priv->mgmta_irq = irq; 2739 } 2740 } 2741 2742 priv->clk = devm_clk_get(&pdev->dev, NULL); 2743 if (IS_ERR(priv->clk)) { 2744 error = PTR_ERR(priv->clk); 2745 goto out_release; 2746 } 2747 2748 priv->refclk = devm_clk_get_optional(&pdev->dev, "refclk"); 2749 if (IS_ERR(priv->refclk)) { 2750 error = PTR_ERR(priv->refclk); 2751 goto out_release; 2752 } 2753 clk_prepare_enable(priv->refclk); 2754 2755 if (info->gptp_ref_clk) { 2756 priv->gptp_clk = devm_clk_get(&pdev->dev, "gptp"); 2757 if (IS_ERR(priv->gptp_clk)) { 2758 error = PTR_ERR(priv->gptp_clk); 2759 goto out_disable_refclk; 2760 } 2761 clk_prepare_enable(priv->gptp_clk); 2762 } 2763 2764 ndev->max_mtu = info->rx_max_buf_size - (ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN); 2765 ndev->min_mtu = ETH_MIN_MTU; 2766 2767 /* FIXME: R-Car Gen2 has 4byte alignment restriction for tx buffer 2768 * Use two descriptor to handle such situation. First descriptor to 2769 * handle aligned data buffer and second descriptor to handle the 2770 * overflow data because of alignment. 2771 */ 2772 priv->num_tx_desc = info->aligned_tx ? 2 : 1; 2773 2774 /* Set function */ 2775 ndev->netdev_ops = &ravb_netdev_ops; 2776 ndev->ethtool_ops = &ravb_ethtool_ops; 2777 2778 /* Set AVB config mode */ 2779 ravb_set_config_mode(ndev); 2780 2781 if (info->gptp || info->ccc_gac) { 2782 /* Set GTI value */ 2783 error = ravb_set_gti(ndev); 2784 if (error) 2785 goto out_disable_gptp_clk; 2786 2787 /* Request GTI loading */ 2788 ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI); 2789 } 2790 2791 if (info->internal_delay) { 2792 ravb_parse_delay_mode(np, ndev); 2793 ravb_set_delay_mode(ndev); 2794 } 2795 2796 /* Allocate descriptor base address table */ 2797 priv->desc_bat_size = sizeof(struct ravb_desc) * DBAT_ENTRY_NUM; 2798 priv->desc_bat = dma_alloc_coherent(ndev->dev.parent, priv->desc_bat_size, 2799 &priv->desc_bat_dma, GFP_KERNEL); 2800 if (!priv->desc_bat) { 2801 dev_err(&pdev->dev, 2802 "Cannot allocate desc base address table (size %d bytes)\n", 2803 priv->desc_bat_size); 2804 error = -ENOMEM; 2805 goto out_disable_gptp_clk; 2806 } 2807 for (q = RAVB_BE; q < DBAT_ENTRY_NUM; q++) 2808 priv->desc_bat[q].die_dt = DT_EOS; 2809 ravb_write(ndev, priv->desc_bat_dma, DBAT); 2810 2811 /* Initialise HW timestamp list */ 2812 INIT_LIST_HEAD(&priv->ts_skb_list); 2813 2814 /* Initialise PTP Clock driver */ 2815 if (info->ccc_gac) 2816 ravb_ptp_init(ndev, pdev); 2817 2818 /* Debug message level */ 2819 priv->msg_enable = RAVB_DEF_MSG_ENABLE; 2820 2821 /* Read and set MAC address */ 2822 ravb_read_mac_address(np, ndev); 2823 if (!is_valid_ether_addr(ndev->dev_addr)) { 2824 dev_warn(&pdev->dev, 2825 "no valid MAC address supplied, using a random one\n"); 2826 eth_hw_addr_random(ndev); 2827 } 2828 2829 /* MDIO bus init */ 2830 error = ravb_mdio_init(priv); 2831 if (error) { 2832 dev_err(&pdev->dev, "failed to initialize MDIO\n"); 2833 goto out_dma_free; 2834 } 2835 2836 netif_napi_add(ndev, &priv->napi[RAVB_BE], ravb_poll, 64); 2837 if (info->nc_queues) 2838 netif_napi_add(ndev, &priv->napi[RAVB_NC], ravb_poll, 64); 2839 2840 /* Network device register */ 2841 error = register_netdev(ndev); 2842 if (error) 2843 goto out_napi_del; 2844 2845 device_set_wakeup_capable(&pdev->dev, 1); 2846 2847 /* Print device information */ 2848 netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n", 2849 (u32)ndev->base_addr, ndev->dev_addr, ndev->irq); 2850 2851 platform_set_drvdata(pdev, ndev); 2852 2853 return 0; 2854 2855 out_napi_del: 2856 if (info->nc_queues) 2857 netif_napi_del(&priv->napi[RAVB_NC]); 2858 2859 netif_napi_del(&priv->napi[RAVB_BE]); 2860 ravb_mdio_release(priv); 2861 out_dma_free: 2862 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat, 2863 priv->desc_bat_dma); 2864 2865 /* Stop PTP Clock driver */ 2866 if (info->ccc_gac) 2867 ravb_ptp_stop(ndev); 2868 out_disable_gptp_clk: 2869 clk_disable_unprepare(priv->gptp_clk); 2870 out_disable_refclk: 2871 clk_disable_unprepare(priv->refclk); 2872 out_release: 2873 free_netdev(ndev); 2874 2875 pm_runtime_put(&pdev->dev); 2876 pm_runtime_disable(&pdev->dev); 2877 reset_control_assert(rstc); 2878 return error; 2879 } 2880 2881 static int ravb_remove(struct platform_device *pdev) 2882 { 2883 struct net_device *ndev = platform_get_drvdata(pdev); 2884 struct ravb_private *priv = netdev_priv(ndev); 2885 const struct ravb_hw_info *info = priv->info; 2886 2887 /* Stop PTP Clock driver */ 2888 if (info->ccc_gac) 2889 ravb_ptp_stop(ndev); 2890 2891 clk_disable_unprepare(priv->gptp_clk); 2892 clk_disable_unprepare(priv->refclk); 2893 2894 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat, 2895 priv->desc_bat_dma); 2896 /* Set reset mode */ 2897 ravb_write(ndev, CCC_OPC_RESET, CCC); 2898 pm_runtime_put_sync(&pdev->dev); 2899 unregister_netdev(ndev); 2900 if (info->nc_queues) 2901 netif_napi_del(&priv->napi[RAVB_NC]); 2902 netif_napi_del(&priv->napi[RAVB_BE]); 2903 ravb_mdio_release(priv); 2904 pm_runtime_disable(&pdev->dev); 2905 reset_control_assert(priv->rstc); 2906 free_netdev(ndev); 2907 platform_set_drvdata(pdev, NULL); 2908 2909 return 0; 2910 } 2911 2912 static int ravb_wol_setup(struct net_device *ndev) 2913 { 2914 struct ravb_private *priv = netdev_priv(ndev); 2915 const struct ravb_hw_info *info = priv->info; 2916 2917 /* Disable interrupts by clearing the interrupt masks. */ 2918 ravb_write(ndev, 0, RIC0); 2919 ravb_write(ndev, 0, RIC2); 2920 ravb_write(ndev, 0, TIC); 2921 2922 /* Only allow ECI interrupts */ 2923 synchronize_irq(priv->emac_irq); 2924 if (info->nc_queues) 2925 napi_disable(&priv->napi[RAVB_NC]); 2926 napi_disable(&priv->napi[RAVB_BE]); 2927 ravb_write(ndev, ECSIPR_MPDIP, ECSIPR); 2928 2929 /* Enable MagicPacket */ 2930 ravb_modify(ndev, ECMR, ECMR_MPDE, ECMR_MPDE); 2931 2932 return enable_irq_wake(priv->emac_irq); 2933 } 2934 2935 static int ravb_wol_restore(struct net_device *ndev) 2936 { 2937 struct ravb_private *priv = netdev_priv(ndev); 2938 const struct ravb_hw_info *info = priv->info; 2939 2940 if (info->nc_queues) 2941 napi_enable(&priv->napi[RAVB_NC]); 2942 napi_enable(&priv->napi[RAVB_BE]); 2943 2944 /* Disable MagicPacket */ 2945 ravb_modify(ndev, ECMR, ECMR_MPDE, 0); 2946 2947 ravb_close(ndev); 2948 2949 return disable_irq_wake(priv->emac_irq); 2950 } 2951 2952 static int __maybe_unused ravb_suspend(struct device *dev) 2953 { 2954 struct net_device *ndev = dev_get_drvdata(dev); 2955 struct ravb_private *priv = netdev_priv(ndev); 2956 int ret; 2957 2958 if (!netif_running(ndev)) 2959 return 0; 2960 2961 netif_device_detach(ndev); 2962 2963 if (priv->wol_enabled) 2964 ret = ravb_wol_setup(ndev); 2965 else 2966 ret = ravb_close(ndev); 2967 2968 return ret; 2969 } 2970 2971 static int __maybe_unused ravb_resume(struct device *dev) 2972 { 2973 struct net_device *ndev = dev_get_drvdata(dev); 2974 struct ravb_private *priv = netdev_priv(ndev); 2975 const struct ravb_hw_info *info = priv->info; 2976 int ret = 0; 2977 2978 /* If WoL is enabled set reset mode to rearm the WoL logic */ 2979 if (priv->wol_enabled) 2980 ravb_write(ndev, CCC_OPC_RESET, CCC); 2981 2982 /* All register have been reset to default values. 2983 * Restore all registers which where setup at probe time and 2984 * reopen device if it was running before system suspended. 2985 */ 2986 2987 /* Set AVB config mode */ 2988 ravb_set_config_mode(ndev); 2989 2990 if (info->gptp || info->ccc_gac) { 2991 /* Set GTI value */ 2992 ret = ravb_set_gti(ndev); 2993 if (ret) 2994 return ret; 2995 2996 /* Request GTI loading */ 2997 ravb_modify(ndev, GCCR, GCCR_LTI, GCCR_LTI); 2998 } 2999 3000 if (info->internal_delay) 3001 ravb_set_delay_mode(ndev); 3002 3003 /* Restore descriptor base address table */ 3004 ravb_write(ndev, priv->desc_bat_dma, DBAT); 3005 3006 if (netif_running(ndev)) { 3007 if (priv->wol_enabled) { 3008 ret = ravb_wol_restore(ndev); 3009 if (ret) 3010 return ret; 3011 } 3012 ret = ravb_open(ndev); 3013 if (ret < 0) 3014 return ret; 3015 netif_device_attach(ndev); 3016 } 3017 3018 return ret; 3019 } 3020 3021 static int __maybe_unused ravb_runtime_nop(struct device *dev) 3022 { 3023 /* Runtime PM callback shared between ->runtime_suspend() 3024 * and ->runtime_resume(). Simply returns success. 3025 * 3026 * This driver re-initializes all registers after 3027 * pm_runtime_get_sync() anyway so there is no need 3028 * to save and restore registers here. 3029 */ 3030 return 0; 3031 } 3032 3033 static const struct dev_pm_ops ravb_dev_pm_ops = { 3034 SET_SYSTEM_SLEEP_PM_OPS(ravb_suspend, ravb_resume) 3035 SET_RUNTIME_PM_OPS(ravb_runtime_nop, ravb_runtime_nop, NULL) 3036 }; 3037 3038 static struct platform_driver ravb_driver = { 3039 .probe = ravb_probe, 3040 .remove = ravb_remove, 3041 .driver = { 3042 .name = "ravb", 3043 .pm = &ravb_dev_pm_ops, 3044 .of_match_table = ravb_match_table, 3045 }, 3046 }; 3047 3048 module_platform_driver(ravb_driver); 3049 3050 MODULE_AUTHOR("Mitsuhiro Kimura, Masaru Nagai"); 3051 MODULE_DESCRIPTION("Renesas Ethernet AVB driver"); 3052 MODULE_LICENSE("GPL v2"); 3053