1 /* Renesas Ethernet AVB device driver 2 * 3 * Copyright (C) 2014-2015 Renesas Electronics Corporation 4 * Copyright (C) 2015 Renesas Solutions Corp. 5 * Copyright (C) 2015 Cogent Embedded, Inc. <source@cogentembedded.com> 6 * 7 * Based on the SuperH Ethernet driver 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms and conditions of the GNU General Public License version 2, 11 * as published by the Free Software Foundation. 12 */ 13 14 #include <linux/cache.h> 15 #include <linux/clk.h> 16 #include <linux/delay.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/err.h> 19 #include <linux/etherdevice.h> 20 #include <linux/ethtool.h> 21 #include <linux/if_vlan.h> 22 #include <linux/kernel.h> 23 #include <linux/list.h> 24 #include <linux/module.h> 25 #include <linux/net_tstamp.h> 26 #include <linux/of.h> 27 #include <linux/of_device.h> 28 #include <linux/of_irq.h> 29 #include <linux/of_mdio.h> 30 #include <linux/of_net.h> 31 #include <linux/pm_runtime.h> 32 #include <linux/slab.h> 33 #include <linux/spinlock.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 int ravb_wait(struct net_device *ndev, enum ravb_reg reg, u32 mask, u32 value) 44 { 45 int i; 46 47 for (i = 0; i < 10000; i++) { 48 if ((ravb_read(ndev, reg) & mask) == value) 49 return 0; 50 udelay(10); 51 } 52 return -ETIMEDOUT; 53 } 54 55 static int ravb_config(struct net_device *ndev) 56 { 57 int error; 58 59 /* Set config mode */ 60 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_CONFIG, 61 CCC); 62 /* Check if the operating mode is changed to the config mode */ 63 error = ravb_wait(ndev, CSR, CSR_OPS, CSR_OPS_CONFIG); 64 if (error) 65 netdev_err(ndev, "failed to switch device to config mode\n"); 66 67 return error; 68 } 69 70 static void ravb_set_duplex(struct net_device *ndev) 71 { 72 struct ravb_private *priv = netdev_priv(ndev); 73 u32 ecmr = ravb_read(ndev, ECMR); 74 75 if (priv->duplex) /* Full */ 76 ecmr |= ECMR_DM; 77 else /* Half */ 78 ecmr &= ~ECMR_DM; 79 ravb_write(ndev, ecmr, ECMR); 80 } 81 82 static void ravb_set_rate(struct net_device *ndev) 83 { 84 struct ravb_private *priv = netdev_priv(ndev); 85 86 switch (priv->speed) { 87 case 100: /* 100BASE */ 88 ravb_write(ndev, GECMR_SPEED_100, GECMR); 89 break; 90 case 1000: /* 1000BASE */ 91 ravb_write(ndev, GECMR_SPEED_1000, GECMR); 92 break; 93 default: 94 break; 95 } 96 } 97 98 static void ravb_set_buffer_align(struct sk_buff *skb) 99 { 100 u32 reserve = (unsigned long)skb->data & (RAVB_ALIGN - 1); 101 102 if (reserve) 103 skb_reserve(skb, RAVB_ALIGN - reserve); 104 } 105 106 /* Get MAC address from the MAC address registers 107 * 108 * Ethernet AVB device doesn't have ROM for MAC address. 109 * This function gets the MAC address that was used by a bootloader. 110 */ 111 static void ravb_read_mac_address(struct net_device *ndev, const u8 *mac) 112 { 113 if (mac) { 114 ether_addr_copy(ndev->dev_addr, mac); 115 } else { 116 ndev->dev_addr[0] = (ravb_read(ndev, MAHR) >> 24); 117 ndev->dev_addr[1] = (ravb_read(ndev, MAHR) >> 16) & 0xFF; 118 ndev->dev_addr[2] = (ravb_read(ndev, MAHR) >> 8) & 0xFF; 119 ndev->dev_addr[3] = (ravb_read(ndev, MAHR) >> 0) & 0xFF; 120 ndev->dev_addr[4] = (ravb_read(ndev, MALR) >> 8) & 0xFF; 121 ndev->dev_addr[5] = (ravb_read(ndev, MALR) >> 0) & 0xFF; 122 } 123 } 124 125 static void ravb_mdio_ctrl(struct mdiobb_ctrl *ctrl, u32 mask, int set) 126 { 127 struct ravb_private *priv = container_of(ctrl, struct ravb_private, 128 mdiobb); 129 u32 pir = ravb_read(priv->ndev, PIR); 130 131 if (set) 132 pir |= mask; 133 else 134 pir &= ~mask; 135 ravb_write(priv->ndev, pir, PIR); 136 } 137 138 /* MDC pin control */ 139 static void ravb_set_mdc(struct mdiobb_ctrl *ctrl, int level) 140 { 141 ravb_mdio_ctrl(ctrl, PIR_MDC, level); 142 } 143 144 /* Data I/O pin control */ 145 static void ravb_set_mdio_dir(struct mdiobb_ctrl *ctrl, int output) 146 { 147 ravb_mdio_ctrl(ctrl, PIR_MMD, output); 148 } 149 150 /* Set data bit */ 151 static void ravb_set_mdio_data(struct mdiobb_ctrl *ctrl, int value) 152 { 153 ravb_mdio_ctrl(ctrl, PIR_MDO, value); 154 } 155 156 /* Get data bit */ 157 static int ravb_get_mdio_data(struct mdiobb_ctrl *ctrl) 158 { 159 struct ravb_private *priv = container_of(ctrl, struct ravb_private, 160 mdiobb); 161 162 return (ravb_read(priv->ndev, PIR) & PIR_MDI) != 0; 163 } 164 165 /* MDIO bus control struct */ 166 static struct mdiobb_ops bb_ops = { 167 .owner = THIS_MODULE, 168 .set_mdc = ravb_set_mdc, 169 .set_mdio_dir = ravb_set_mdio_dir, 170 .set_mdio_data = ravb_set_mdio_data, 171 .get_mdio_data = ravb_get_mdio_data, 172 }; 173 174 /* Free skb's and DMA buffers for Ethernet AVB */ 175 static void ravb_ring_free(struct net_device *ndev, int q) 176 { 177 struct ravb_private *priv = netdev_priv(ndev); 178 int ring_size; 179 int i; 180 181 /* Free RX skb ringbuffer */ 182 if (priv->rx_skb[q]) { 183 for (i = 0; i < priv->num_rx_ring[q]; i++) 184 dev_kfree_skb(priv->rx_skb[q][i]); 185 } 186 kfree(priv->rx_skb[q]); 187 priv->rx_skb[q] = NULL; 188 189 /* Free TX skb ringbuffer */ 190 if (priv->tx_skb[q]) { 191 for (i = 0; i < priv->num_tx_ring[q]; i++) 192 dev_kfree_skb(priv->tx_skb[q][i]); 193 } 194 kfree(priv->tx_skb[q]); 195 priv->tx_skb[q] = NULL; 196 197 /* Free aligned TX buffers */ 198 kfree(priv->tx_align[q]); 199 priv->tx_align[q] = NULL; 200 201 if (priv->rx_ring[q]) { 202 ring_size = sizeof(struct ravb_ex_rx_desc) * 203 (priv->num_rx_ring[q] + 1); 204 dma_free_coherent(ndev->dev.parent, ring_size, priv->rx_ring[q], 205 priv->rx_desc_dma[q]); 206 priv->rx_ring[q] = NULL; 207 } 208 209 if (priv->tx_ring[q]) { 210 ring_size = sizeof(struct ravb_tx_desc) * 211 (priv->num_tx_ring[q] * NUM_TX_DESC + 1); 212 dma_free_coherent(ndev->dev.parent, ring_size, priv->tx_ring[q], 213 priv->tx_desc_dma[q]); 214 priv->tx_ring[q] = NULL; 215 } 216 } 217 218 /* Format skb and descriptor buffer for Ethernet AVB */ 219 static void ravb_ring_format(struct net_device *ndev, int q) 220 { 221 struct ravb_private *priv = netdev_priv(ndev); 222 struct ravb_ex_rx_desc *rx_desc; 223 struct ravb_tx_desc *tx_desc; 224 struct ravb_desc *desc; 225 int rx_ring_size = sizeof(*rx_desc) * priv->num_rx_ring[q]; 226 int tx_ring_size = sizeof(*tx_desc) * priv->num_tx_ring[q] * 227 NUM_TX_DESC; 228 dma_addr_t dma_addr; 229 int i; 230 231 priv->cur_rx[q] = 0; 232 priv->cur_tx[q] = 0; 233 priv->dirty_rx[q] = 0; 234 priv->dirty_tx[q] = 0; 235 236 memset(priv->rx_ring[q], 0, rx_ring_size); 237 /* Build RX ring buffer */ 238 for (i = 0; i < priv->num_rx_ring[q]; i++) { 239 /* RX descriptor */ 240 rx_desc = &priv->rx_ring[q][i]; 241 /* The size of the buffer should be on 16-byte boundary. */ 242 rx_desc->ds_cc = cpu_to_le16(ALIGN(PKT_BUF_SZ, 16)); 243 dma_addr = dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->data, 244 ALIGN(PKT_BUF_SZ, 16), 245 DMA_FROM_DEVICE); 246 /* We just set the data size to 0 for a failed mapping which 247 * should prevent DMA from happening... 248 */ 249 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 250 rx_desc->ds_cc = cpu_to_le16(0); 251 rx_desc->dptr = cpu_to_le32(dma_addr); 252 rx_desc->die_dt = DT_FEMPTY; 253 } 254 rx_desc = &priv->rx_ring[q][i]; 255 rx_desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]); 256 rx_desc->die_dt = DT_LINKFIX; /* type */ 257 258 memset(priv->tx_ring[q], 0, tx_ring_size); 259 /* Build TX ring buffer */ 260 for (i = 0, tx_desc = priv->tx_ring[q]; i < priv->num_tx_ring[q]; 261 i++, tx_desc++) { 262 tx_desc->die_dt = DT_EEMPTY; 263 tx_desc++; 264 tx_desc->die_dt = DT_EEMPTY; 265 } 266 tx_desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]); 267 tx_desc->die_dt = DT_LINKFIX; /* type */ 268 269 /* RX descriptor base address for best effort */ 270 desc = &priv->desc_bat[RX_QUEUE_OFFSET + q]; 271 desc->die_dt = DT_LINKFIX; /* type */ 272 desc->dptr = cpu_to_le32((u32)priv->rx_desc_dma[q]); 273 274 /* TX descriptor base address for best effort */ 275 desc = &priv->desc_bat[q]; 276 desc->die_dt = DT_LINKFIX; /* type */ 277 desc->dptr = cpu_to_le32((u32)priv->tx_desc_dma[q]); 278 } 279 280 /* Init skb and descriptor buffer for Ethernet AVB */ 281 static int ravb_ring_init(struct net_device *ndev, int q) 282 { 283 struct ravb_private *priv = netdev_priv(ndev); 284 struct sk_buff *skb; 285 int ring_size; 286 int i; 287 288 /* Allocate RX and TX skb rings */ 289 priv->rx_skb[q] = kcalloc(priv->num_rx_ring[q], 290 sizeof(*priv->rx_skb[q]), GFP_KERNEL); 291 priv->tx_skb[q] = kcalloc(priv->num_tx_ring[q], 292 sizeof(*priv->tx_skb[q]), GFP_KERNEL); 293 if (!priv->rx_skb[q] || !priv->tx_skb[q]) 294 goto error; 295 296 for (i = 0; i < priv->num_rx_ring[q]; i++) { 297 skb = netdev_alloc_skb(ndev, PKT_BUF_SZ + RAVB_ALIGN - 1); 298 if (!skb) 299 goto error; 300 ravb_set_buffer_align(skb); 301 priv->rx_skb[q][i] = skb; 302 } 303 304 /* Allocate rings for the aligned buffers */ 305 priv->tx_align[q] = kmalloc(DPTR_ALIGN * priv->num_tx_ring[q] + 306 DPTR_ALIGN - 1, GFP_KERNEL); 307 if (!priv->tx_align[q]) 308 goto error; 309 310 /* Allocate all RX descriptors. */ 311 ring_size = sizeof(struct ravb_ex_rx_desc) * (priv->num_rx_ring[q] + 1); 312 priv->rx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size, 313 &priv->rx_desc_dma[q], 314 GFP_KERNEL); 315 if (!priv->rx_ring[q]) 316 goto error; 317 318 priv->dirty_rx[q] = 0; 319 320 /* Allocate all TX descriptors. */ 321 ring_size = sizeof(struct ravb_tx_desc) * 322 (priv->num_tx_ring[q] * NUM_TX_DESC + 1); 323 priv->tx_ring[q] = dma_alloc_coherent(ndev->dev.parent, ring_size, 324 &priv->tx_desc_dma[q], 325 GFP_KERNEL); 326 if (!priv->tx_ring[q]) 327 goto error; 328 329 return 0; 330 331 error: 332 ravb_ring_free(ndev, q); 333 334 return -ENOMEM; 335 } 336 337 /* E-MAC init function */ 338 static void ravb_emac_init(struct net_device *ndev) 339 { 340 struct ravb_private *priv = netdev_priv(ndev); 341 u32 ecmr; 342 343 /* Receive frame limit set register */ 344 ravb_write(ndev, ndev->mtu + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN, RFLR); 345 346 /* PAUSE prohibition */ 347 ecmr = ravb_read(ndev, ECMR); 348 ecmr &= ECMR_DM; 349 ecmr |= ECMR_ZPF | (priv->duplex ? ECMR_DM : 0) | ECMR_TE | ECMR_RE; 350 ravb_write(ndev, ecmr, ECMR); 351 352 ravb_set_rate(ndev); 353 354 /* Set MAC address */ 355 ravb_write(ndev, 356 (ndev->dev_addr[0] << 24) | (ndev->dev_addr[1] << 16) | 357 (ndev->dev_addr[2] << 8) | (ndev->dev_addr[3]), MAHR); 358 ravb_write(ndev, 359 (ndev->dev_addr[4] << 8) | (ndev->dev_addr[5]), MALR); 360 361 ravb_write(ndev, 1, MPR); 362 363 /* E-MAC status register clear */ 364 ravb_write(ndev, ECSR_ICD | ECSR_MPD, ECSR); 365 366 /* E-MAC interrupt enable register */ 367 ravb_write(ndev, ECSIPR_ICDIP | ECSIPR_MPDIP | ECSIPR_LCHNGIP, ECSIPR); 368 } 369 370 /* Device init function for Ethernet AVB */ 371 static int ravb_dmac_init(struct net_device *ndev) 372 { 373 int error; 374 375 /* Set CONFIG mode */ 376 error = ravb_config(ndev); 377 if (error) 378 return error; 379 380 error = ravb_ring_init(ndev, RAVB_BE); 381 if (error) 382 return error; 383 error = ravb_ring_init(ndev, RAVB_NC); 384 if (error) { 385 ravb_ring_free(ndev, RAVB_BE); 386 return error; 387 } 388 389 /* Descriptor format */ 390 ravb_ring_format(ndev, RAVB_BE); 391 ravb_ring_format(ndev, RAVB_NC); 392 393 #if defined(__LITTLE_ENDIAN) 394 ravb_write(ndev, ravb_read(ndev, CCC) & ~CCC_BOC, CCC); 395 #else 396 ravb_write(ndev, ravb_read(ndev, CCC) | CCC_BOC, CCC); 397 #endif 398 399 /* Set AVB RX */ 400 ravb_write(ndev, RCR_EFFS | RCR_ENCF | RCR_ETS0 | 0x18000000, RCR); 401 402 /* Set FIFO size */ 403 ravb_write(ndev, TGC_TQP_AVBMODE1 | 0x00222200, TGC); 404 405 /* Timestamp enable */ 406 ravb_write(ndev, TCCR_TFEN, TCCR); 407 408 /* Interrupt enable: */ 409 /* Frame receive */ 410 ravb_write(ndev, RIC0_FRE0 | RIC0_FRE1, RIC0); 411 /* Receive FIFO full warning */ 412 ravb_write(ndev, RIC1_RFWE, RIC1); 413 /* Receive FIFO full error, descriptor empty */ 414 ravb_write(ndev, RIC2_QFE0 | RIC2_QFE1 | RIC2_RFFE, RIC2); 415 /* Frame transmitted, timestamp FIFO updated */ 416 ravb_write(ndev, TIC_FTE0 | TIC_FTE1 | TIC_TFUE, TIC); 417 418 /* Setting the control will start the AVB-DMAC process. */ 419 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_OPERATION, 420 CCC); 421 422 return 0; 423 } 424 425 /* Free TX skb function for AVB-IP */ 426 static int ravb_tx_free(struct net_device *ndev, int q) 427 { 428 struct ravb_private *priv = netdev_priv(ndev); 429 struct net_device_stats *stats = &priv->stats[q]; 430 struct ravb_tx_desc *desc; 431 int free_num = 0; 432 int entry; 433 u32 size; 434 435 for (; priv->cur_tx[q] - priv->dirty_tx[q] > 0; priv->dirty_tx[q]++) { 436 entry = priv->dirty_tx[q] % (priv->num_tx_ring[q] * 437 NUM_TX_DESC); 438 desc = &priv->tx_ring[q][entry]; 439 if (desc->die_dt != DT_FEMPTY) 440 break; 441 /* Descriptor type must be checked before all other reads */ 442 dma_rmb(); 443 size = le16_to_cpu(desc->ds_tagl) & TX_DS; 444 /* Free the original skb. */ 445 if (priv->tx_skb[q][entry / NUM_TX_DESC]) { 446 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr), 447 size, DMA_TO_DEVICE); 448 /* Last packet descriptor? */ 449 if (entry % NUM_TX_DESC == NUM_TX_DESC - 1) { 450 entry /= NUM_TX_DESC; 451 dev_kfree_skb_any(priv->tx_skb[q][entry]); 452 priv->tx_skb[q][entry] = NULL; 453 stats->tx_packets++; 454 } 455 free_num++; 456 } 457 stats->tx_bytes += size; 458 desc->die_dt = DT_EEMPTY; 459 } 460 return free_num; 461 } 462 463 static void ravb_get_tx_tstamp(struct net_device *ndev) 464 { 465 struct ravb_private *priv = netdev_priv(ndev); 466 struct ravb_tstamp_skb *ts_skb, *ts_skb2; 467 struct skb_shared_hwtstamps shhwtstamps; 468 struct sk_buff *skb; 469 struct timespec64 ts; 470 u16 tag, tfa_tag; 471 int count; 472 u32 tfa2; 473 474 count = (ravb_read(ndev, TSR) & TSR_TFFL) >> 8; 475 while (count--) { 476 tfa2 = ravb_read(ndev, TFA2); 477 tfa_tag = (tfa2 & TFA2_TST) >> 16; 478 ts.tv_nsec = (u64)ravb_read(ndev, TFA0); 479 ts.tv_sec = ((u64)(tfa2 & TFA2_TSV) << 32) | 480 ravb_read(ndev, TFA1); 481 memset(&shhwtstamps, 0, sizeof(shhwtstamps)); 482 shhwtstamps.hwtstamp = timespec64_to_ktime(ts); 483 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, 484 list) { 485 skb = ts_skb->skb; 486 tag = ts_skb->tag; 487 list_del(&ts_skb->list); 488 kfree(ts_skb); 489 if (tag == tfa_tag) { 490 skb_tstamp_tx(skb, &shhwtstamps); 491 break; 492 } 493 } 494 ravb_write(ndev, ravb_read(ndev, TCCR) | TCCR_TFR, TCCR); 495 } 496 } 497 498 /* Packet receive function for Ethernet AVB */ 499 static bool ravb_rx(struct net_device *ndev, int *quota, int q) 500 { 501 struct ravb_private *priv = netdev_priv(ndev); 502 int entry = priv->cur_rx[q] % priv->num_rx_ring[q]; 503 int boguscnt = (priv->dirty_rx[q] + priv->num_rx_ring[q]) - 504 priv->cur_rx[q]; 505 struct net_device_stats *stats = &priv->stats[q]; 506 struct ravb_ex_rx_desc *desc; 507 struct sk_buff *skb; 508 dma_addr_t dma_addr; 509 struct timespec64 ts; 510 u8 desc_status; 511 u16 pkt_len; 512 int limit; 513 514 boguscnt = min(boguscnt, *quota); 515 limit = boguscnt; 516 desc = &priv->rx_ring[q][entry]; 517 while (desc->die_dt != DT_FEMPTY) { 518 /* Descriptor type must be checked before all other reads */ 519 dma_rmb(); 520 desc_status = desc->msc; 521 pkt_len = le16_to_cpu(desc->ds_cc) & RX_DS; 522 523 if (--boguscnt < 0) 524 break; 525 526 /* We use 0-byte descriptors to mark the DMA mapping errors */ 527 if (!pkt_len) 528 continue; 529 530 if (desc_status & MSC_MC) 531 stats->multicast++; 532 533 if (desc_status & (MSC_CRC | MSC_RFE | MSC_RTSF | MSC_RTLF | 534 MSC_CEEF)) { 535 stats->rx_errors++; 536 if (desc_status & MSC_CRC) 537 stats->rx_crc_errors++; 538 if (desc_status & MSC_RFE) 539 stats->rx_frame_errors++; 540 if (desc_status & (MSC_RTLF | MSC_RTSF)) 541 stats->rx_length_errors++; 542 if (desc_status & MSC_CEEF) 543 stats->rx_missed_errors++; 544 } else { 545 u32 get_ts = priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE; 546 547 skb = priv->rx_skb[q][entry]; 548 priv->rx_skb[q][entry] = NULL; 549 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr), 550 ALIGN(PKT_BUF_SZ, 16), 551 DMA_FROM_DEVICE); 552 get_ts &= (q == RAVB_NC) ? 553 RAVB_RXTSTAMP_TYPE_V2_L2_EVENT : 554 ~RAVB_RXTSTAMP_TYPE_V2_L2_EVENT; 555 if (get_ts) { 556 struct skb_shared_hwtstamps *shhwtstamps; 557 558 shhwtstamps = skb_hwtstamps(skb); 559 memset(shhwtstamps, 0, sizeof(*shhwtstamps)); 560 ts.tv_sec = ((u64) le16_to_cpu(desc->ts_sh) << 561 32) | le32_to_cpu(desc->ts_sl); 562 ts.tv_nsec = le32_to_cpu(desc->ts_n); 563 shhwtstamps->hwtstamp = timespec64_to_ktime(ts); 564 } 565 skb_put(skb, pkt_len); 566 skb->protocol = eth_type_trans(skb, ndev); 567 napi_gro_receive(&priv->napi[q], skb); 568 stats->rx_packets++; 569 stats->rx_bytes += pkt_len; 570 } 571 572 entry = (++priv->cur_rx[q]) % priv->num_rx_ring[q]; 573 desc = &priv->rx_ring[q][entry]; 574 } 575 576 /* Refill the RX ring buffers. */ 577 for (; priv->cur_rx[q] - priv->dirty_rx[q] > 0; priv->dirty_rx[q]++) { 578 entry = priv->dirty_rx[q] % priv->num_rx_ring[q]; 579 desc = &priv->rx_ring[q][entry]; 580 /* The size of the buffer should be on 16-byte boundary. */ 581 desc->ds_cc = cpu_to_le16(ALIGN(PKT_BUF_SZ, 16)); 582 583 if (!priv->rx_skb[q][entry]) { 584 skb = netdev_alloc_skb(ndev, 585 PKT_BUF_SZ + RAVB_ALIGN - 1); 586 if (!skb) 587 break; /* Better luck next round. */ 588 ravb_set_buffer_align(skb); 589 dma_addr = dma_map_single(ndev->dev.parent, skb->data, 590 le16_to_cpu(desc->ds_cc), 591 DMA_FROM_DEVICE); 592 skb_checksum_none_assert(skb); 593 /* We just set the data size to 0 for a failed mapping 594 * which should prevent DMA from happening... 595 */ 596 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 597 desc->ds_cc = cpu_to_le16(0); 598 desc->dptr = cpu_to_le32(dma_addr); 599 priv->rx_skb[q][entry] = skb; 600 } 601 /* Descriptor type must be set after all the above writes */ 602 dma_wmb(); 603 desc->die_dt = DT_FEMPTY; 604 } 605 606 *quota -= limit - (++boguscnt); 607 608 return boguscnt <= 0; 609 } 610 611 static void ravb_rcv_snd_disable(struct net_device *ndev) 612 { 613 /* Disable TX and RX */ 614 ravb_write(ndev, ravb_read(ndev, ECMR) & ~(ECMR_RE | ECMR_TE), ECMR); 615 } 616 617 static void ravb_rcv_snd_enable(struct net_device *ndev) 618 { 619 /* Enable TX and RX */ 620 ravb_write(ndev, ravb_read(ndev, ECMR) | ECMR_RE | ECMR_TE, ECMR); 621 } 622 623 /* function for waiting dma process finished */ 624 static int ravb_stop_dma(struct net_device *ndev) 625 { 626 int error; 627 628 /* Wait for stopping the hardware TX process */ 629 error = ravb_wait(ndev, TCCR, 630 TCCR_TSRQ0 | TCCR_TSRQ1 | TCCR_TSRQ2 | TCCR_TSRQ3, 0); 631 if (error) 632 return error; 633 634 error = ravb_wait(ndev, CSR, CSR_TPO0 | CSR_TPO1 | CSR_TPO2 | CSR_TPO3, 635 0); 636 if (error) 637 return error; 638 639 /* Stop the E-MAC's RX/TX processes. */ 640 ravb_rcv_snd_disable(ndev); 641 642 /* Wait for stopping the RX DMA process */ 643 error = ravb_wait(ndev, CSR, CSR_RPO, 0); 644 if (error) 645 return error; 646 647 /* Stop AVB-DMAC process */ 648 return ravb_config(ndev); 649 } 650 651 /* E-MAC interrupt handler */ 652 static void ravb_emac_interrupt(struct net_device *ndev) 653 { 654 struct ravb_private *priv = netdev_priv(ndev); 655 u32 ecsr, psr; 656 657 ecsr = ravb_read(ndev, ECSR); 658 ravb_write(ndev, ecsr, ECSR); /* clear interrupt */ 659 if (ecsr & ECSR_ICD) 660 ndev->stats.tx_carrier_errors++; 661 if (ecsr & ECSR_LCHNG) { 662 /* Link changed */ 663 if (priv->no_avb_link) 664 return; 665 psr = ravb_read(ndev, PSR); 666 if (priv->avb_link_active_low) 667 psr ^= PSR_LMON; 668 if (!(psr & PSR_LMON)) { 669 /* DIsable RX and TX */ 670 ravb_rcv_snd_disable(ndev); 671 } else { 672 /* Enable RX and TX */ 673 ravb_rcv_snd_enable(ndev); 674 } 675 } 676 } 677 678 /* Error interrupt handler */ 679 static void ravb_error_interrupt(struct net_device *ndev) 680 { 681 struct ravb_private *priv = netdev_priv(ndev); 682 u32 eis, ris2; 683 684 eis = ravb_read(ndev, EIS); 685 ravb_write(ndev, ~EIS_QFS, EIS); 686 if (eis & EIS_QFS) { 687 ris2 = ravb_read(ndev, RIS2); 688 ravb_write(ndev, ~(RIS2_QFF0 | RIS2_RFFF), RIS2); 689 690 /* Receive Descriptor Empty int */ 691 if (ris2 & RIS2_QFF0) 692 priv->stats[RAVB_BE].rx_over_errors++; 693 694 /* Receive Descriptor Empty int */ 695 if (ris2 & RIS2_QFF1) 696 priv->stats[RAVB_NC].rx_over_errors++; 697 698 /* Receive FIFO Overflow int */ 699 if (ris2 & RIS2_RFFF) 700 priv->rx_fifo_errors++; 701 } 702 } 703 704 static irqreturn_t ravb_interrupt(int irq, void *dev_id) 705 { 706 struct net_device *ndev = dev_id; 707 struct ravb_private *priv = netdev_priv(ndev); 708 irqreturn_t result = IRQ_NONE; 709 u32 iss; 710 711 spin_lock(&priv->lock); 712 /* Get interrupt status */ 713 iss = ravb_read(ndev, ISS); 714 715 /* Received and transmitted interrupts */ 716 if (iss & (ISS_FRS | ISS_FTS | ISS_TFUS)) { 717 u32 ris0 = ravb_read(ndev, RIS0); 718 u32 ric0 = ravb_read(ndev, RIC0); 719 u32 tis = ravb_read(ndev, TIS); 720 u32 tic = ravb_read(ndev, TIC); 721 int q; 722 723 /* Timestamp updated */ 724 if (tis & TIS_TFUF) { 725 ravb_write(ndev, ~TIS_TFUF, TIS); 726 ravb_get_tx_tstamp(ndev); 727 result = IRQ_HANDLED; 728 } 729 730 /* Network control and best effort queue RX/TX */ 731 for (q = RAVB_NC; q >= RAVB_BE; q--) { 732 if (((ris0 & ric0) & BIT(q)) || 733 ((tis & tic) & BIT(q))) { 734 if (napi_schedule_prep(&priv->napi[q])) { 735 /* Mask RX and TX interrupts */ 736 ravb_write(ndev, ric0 & ~BIT(q), RIC0); 737 ravb_write(ndev, tic & ~BIT(q), TIC); 738 __napi_schedule(&priv->napi[q]); 739 } else { 740 netdev_warn(ndev, 741 "ignoring interrupt, rx status 0x%08x, rx mask 0x%08x,\n", 742 ris0, ric0); 743 netdev_warn(ndev, 744 " tx status 0x%08x, tx mask 0x%08x.\n", 745 tis, tic); 746 } 747 result = IRQ_HANDLED; 748 } 749 } 750 } 751 752 /* E-MAC status summary */ 753 if (iss & ISS_MS) { 754 ravb_emac_interrupt(ndev); 755 result = IRQ_HANDLED; 756 } 757 758 /* Error status summary */ 759 if (iss & ISS_ES) { 760 ravb_error_interrupt(ndev); 761 result = IRQ_HANDLED; 762 } 763 764 if (iss & ISS_CGIS) 765 result = ravb_ptp_interrupt(ndev); 766 767 mmiowb(); 768 spin_unlock(&priv->lock); 769 return result; 770 } 771 772 static int ravb_poll(struct napi_struct *napi, int budget) 773 { 774 struct net_device *ndev = napi->dev; 775 struct ravb_private *priv = netdev_priv(ndev); 776 unsigned long flags; 777 int q = napi - priv->napi; 778 int mask = BIT(q); 779 int quota = budget; 780 u32 ris0, tis; 781 782 for (;;) { 783 tis = ravb_read(ndev, TIS); 784 ris0 = ravb_read(ndev, RIS0); 785 if (!((ris0 & mask) || (tis & mask))) 786 break; 787 788 /* Processing RX Descriptor Ring */ 789 if (ris0 & mask) { 790 /* Clear RX interrupt */ 791 ravb_write(ndev, ~mask, RIS0); 792 if (ravb_rx(ndev, "a, q)) 793 goto out; 794 } 795 /* Processing TX Descriptor Ring */ 796 if (tis & mask) { 797 spin_lock_irqsave(&priv->lock, flags); 798 /* Clear TX interrupt */ 799 ravb_write(ndev, ~mask, TIS); 800 ravb_tx_free(ndev, q); 801 netif_wake_subqueue(ndev, q); 802 mmiowb(); 803 spin_unlock_irqrestore(&priv->lock, flags); 804 } 805 } 806 807 napi_complete(napi); 808 809 /* Re-enable RX/TX interrupts */ 810 spin_lock_irqsave(&priv->lock, flags); 811 ravb_write(ndev, ravb_read(ndev, RIC0) | mask, RIC0); 812 ravb_write(ndev, ravb_read(ndev, TIC) | mask, TIC); 813 mmiowb(); 814 spin_unlock_irqrestore(&priv->lock, flags); 815 816 /* Receive error message handling */ 817 priv->rx_over_errors = priv->stats[RAVB_BE].rx_over_errors; 818 priv->rx_over_errors += priv->stats[RAVB_NC].rx_over_errors; 819 if (priv->rx_over_errors != ndev->stats.rx_over_errors) { 820 ndev->stats.rx_over_errors = priv->rx_over_errors; 821 netif_err(priv, rx_err, ndev, "Receive Descriptor Empty\n"); 822 } 823 if (priv->rx_fifo_errors != ndev->stats.rx_fifo_errors) { 824 ndev->stats.rx_fifo_errors = priv->rx_fifo_errors; 825 netif_err(priv, rx_err, ndev, "Receive FIFO Overflow\n"); 826 } 827 out: 828 return budget - quota; 829 } 830 831 /* PHY state control function */ 832 static void ravb_adjust_link(struct net_device *ndev) 833 { 834 struct ravb_private *priv = netdev_priv(ndev); 835 struct phy_device *phydev = priv->phydev; 836 bool new_state = false; 837 838 if (phydev->link) { 839 if (phydev->duplex != priv->duplex) { 840 new_state = true; 841 priv->duplex = phydev->duplex; 842 ravb_set_duplex(ndev); 843 } 844 845 if (phydev->speed != priv->speed) { 846 new_state = true; 847 priv->speed = phydev->speed; 848 ravb_set_rate(ndev); 849 } 850 if (!priv->link) { 851 ravb_write(ndev, ravb_read(ndev, ECMR) & ~ECMR_TXF, 852 ECMR); 853 new_state = true; 854 priv->link = phydev->link; 855 if (priv->no_avb_link) 856 ravb_rcv_snd_enable(ndev); 857 } 858 } else if (priv->link) { 859 new_state = true; 860 priv->link = 0; 861 priv->speed = 0; 862 priv->duplex = -1; 863 if (priv->no_avb_link) 864 ravb_rcv_snd_disable(ndev); 865 } 866 867 if (new_state && netif_msg_link(priv)) 868 phy_print_status(phydev); 869 } 870 871 /* PHY init function */ 872 static int ravb_phy_init(struct net_device *ndev) 873 { 874 struct device_node *np = ndev->dev.parent->of_node; 875 struct ravb_private *priv = netdev_priv(ndev); 876 struct phy_device *phydev; 877 struct device_node *pn; 878 879 priv->link = 0; 880 priv->speed = 0; 881 priv->duplex = -1; 882 883 /* Try connecting to PHY */ 884 pn = of_parse_phandle(np, "phy-handle", 0); 885 phydev = of_phy_connect(ndev, pn, ravb_adjust_link, 0, 886 priv->phy_interface); 887 if (!phydev) { 888 netdev_err(ndev, "failed to connect PHY\n"); 889 return -ENOENT; 890 } 891 892 /* This driver only support 10/100Mbit speeds on Gen3 893 * at this time. 894 */ 895 if (priv->chip_id == RCAR_GEN3) { 896 int err; 897 898 err = phy_set_max_speed(phydev, SPEED_100); 899 if (err) { 900 netdev_err(ndev, "failed to limit PHY to 100Mbit/s\n"); 901 phy_disconnect(phydev); 902 return err; 903 } 904 905 netdev_info(ndev, "limited PHY to 100Mbit/s\n"); 906 } 907 908 netdev_info(ndev, "attached PHY %d (IRQ %d) to driver %s\n", 909 phydev->addr, phydev->irq, phydev->drv->name); 910 911 priv->phydev = phydev; 912 913 return 0; 914 } 915 916 /* PHY control start function */ 917 static int ravb_phy_start(struct net_device *ndev) 918 { 919 struct ravb_private *priv = netdev_priv(ndev); 920 int error; 921 922 error = ravb_phy_init(ndev); 923 if (error) 924 return error; 925 926 phy_start(priv->phydev); 927 928 return 0; 929 } 930 931 static int ravb_get_settings(struct net_device *ndev, struct ethtool_cmd *ecmd) 932 { 933 struct ravb_private *priv = netdev_priv(ndev); 934 int error = -ENODEV; 935 unsigned long flags; 936 937 if (priv->phydev) { 938 spin_lock_irqsave(&priv->lock, flags); 939 error = phy_ethtool_gset(priv->phydev, ecmd); 940 spin_unlock_irqrestore(&priv->lock, flags); 941 } 942 943 return error; 944 } 945 946 static int ravb_set_settings(struct net_device *ndev, struct ethtool_cmd *ecmd) 947 { 948 struct ravb_private *priv = netdev_priv(ndev); 949 unsigned long flags; 950 int error; 951 952 if (!priv->phydev) 953 return -ENODEV; 954 955 spin_lock_irqsave(&priv->lock, flags); 956 957 /* Disable TX and RX */ 958 ravb_rcv_snd_disable(ndev); 959 960 error = phy_ethtool_sset(priv->phydev, ecmd); 961 if (error) 962 goto error_exit; 963 964 if (ecmd->duplex == DUPLEX_FULL) 965 priv->duplex = 1; 966 else 967 priv->duplex = 0; 968 969 ravb_set_duplex(ndev); 970 971 error_exit: 972 mdelay(1); 973 974 /* Enable TX and RX */ 975 ravb_rcv_snd_enable(ndev); 976 977 mmiowb(); 978 spin_unlock_irqrestore(&priv->lock, flags); 979 980 return error; 981 } 982 983 static int ravb_nway_reset(struct net_device *ndev) 984 { 985 struct ravb_private *priv = netdev_priv(ndev); 986 int error = -ENODEV; 987 unsigned long flags; 988 989 if (priv->phydev) { 990 spin_lock_irqsave(&priv->lock, flags); 991 error = phy_start_aneg(priv->phydev); 992 spin_unlock_irqrestore(&priv->lock, flags); 993 } 994 995 return error; 996 } 997 998 static u32 ravb_get_msglevel(struct net_device *ndev) 999 { 1000 struct ravb_private *priv = netdev_priv(ndev); 1001 1002 return priv->msg_enable; 1003 } 1004 1005 static void ravb_set_msglevel(struct net_device *ndev, u32 value) 1006 { 1007 struct ravb_private *priv = netdev_priv(ndev); 1008 1009 priv->msg_enable = value; 1010 } 1011 1012 static const char ravb_gstrings_stats[][ETH_GSTRING_LEN] = { 1013 "rx_queue_0_current", 1014 "tx_queue_0_current", 1015 "rx_queue_0_dirty", 1016 "tx_queue_0_dirty", 1017 "rx_queue_0_packets", 1018 "tx_queue_0_packets", 1019 "rx_queue_0_bytes", 1020 "tx_queue_0_bytes", 1021 "rx_queue_0_mcast_packets", 1022 "rx_queue_0_errors", 1023 "rx_queue_0_crc_errors", 1024 "rx_queue_0_frame_errors", 1025 "rx_queue_0_length_errors", 1026 "rx_queue_0_missed_errors", 1027 "rx_queue_0_over_errors", 1028 1029 "rx_queue_1_current", 1030 "tx_queue_1_current", 1031 "rx_queue_1_dirty", 1032 "tx_queue_1_dirty", 1033 "rx_queue_1_packets", 1034 "tx_queue_1_packets", 1035 "rx_queue_1_bytes", 1036 "tx_queue_1_bytes", 1037 "rx_queue_1_mcast_packets", 1038 "rx_queue_1_errors", 1039 "rx_queue_1_crc_errors", 1040 "rx_queue_1_frame_errors_", 1041 "rx_queue_1_length_errors", 1042 "rx_queue_1_missed_errors", 1043 "rx_queue_1_over_errors", 1044 }; 1045 1046 #define RAVB_STATS_LEN ARRAY_SIZE(ravb_gstrings_stats) 1047 1048 static int ravb_get_sset_count(struct net_device *netdev, int sset) 1049 { 1050 switch (sset) { 1051 case ETH_SS_STATS: 1052 return RAVB_STATS_LEN; 1053 default: 1054 return -EOPNOTSUPP; 1055 } 1056 } 1057 1058 static void ravb_get_ethtool_stats(struct net_device *ndev, 1059 struct ethtool_stats *stats, u64 *data) 1060 { 1061 struct ravb_private *priv = netdev_priv(ndev); 1062 int i = 0; 1063 int q; 1064 1065 /* Device-specific stats */ 1066 for (q = RAVB_BE; q < NUM_RX_QUEUE; q++) { 1067 struct net_device_stats *stats = &priv->stats[q]; 1068 1069 data[i++] = priv->cur_rx[q]; 1070 data[i++] = priv->cur_tx[q]; 1071 data[i++] = priv->dirty_rx[q]; 1072 data[i++] = priv->dirty_tx[q]; 1073 data[i++] = stats->rx_packets; 1074 data[i++] = stats->tx_packets; 1075 data[i++] = stats->rx_bytes; 1076 data[i++] = stats->tx_bytes; 1077 data[i++] = stats->multicast; 1078 data[i++] = stats->rx_errors; 1079 data[i++] = stats->rx_crc_errors; 1080 data[i++] = stats->rx_frame_errors; 1081 data[i++] = stats->rx_length_errors; 1082 data[i++] = stats->rx_missed_errors; 1083 data[i++] = stats->rx_over_errors; 1084 } 1085 } 1086 1087 static void ravb_get_strings(struct net_device *ndev, u32 stringset, u8 *data) 1088 { 1089 switch (stringset) { 1090 case ETH_SS_STATS: 1091 memcpy(data, *ravb_gstrings_stats, sizeof(ravb_gstrings_stats)); 1092 break; 1093 } 1094 } 1095 1096 static void ravb_get_ringparam(struct net_device *ndev, 1097 struct ethtool_ringparam *ring) 1098 { 1099 struct ravb_private *priv = netdev_priv(ndev); 1100 1101 ring->rx_max_pending = BE_RX_RING_MAX; 1102 ring->tx_max_pending = BE_TX_RING_MAX; 1103 ring->rx_pending = priv->num_rx_ring[RAVB_BE]; 1104 ring->tx_pending = priv->num_tx_ring[RAVB_BE]; 1105 } 1106 1107 static int ravb_set_ringparam(struct net_device *ndev, 1108 struct ethtool_ringparam *ring) 1109 { 1110 struct ravb_private *priv = netdev_priv(ndev); 1111 int error; 1112 1113 if (ring->tx_pending > BE_TX_RING_MAX || 1114 ring->rx_pending > BE_RX_RING_MAX || 1115 ring->tx_pending < BE_TX_RING_MIN || 1116 ring->rx_pending < BE_RX_RING_MIN) 1117 return -EINVAL; 1118 if (ring->rx_mini_pending || ring->rx_jumbo_pending) 1119 return -EINVAL; 1120 1121 if (netif_running(ndev)) { 1122 netif_device_detach(ndev); 1123 /* Stop PTP Clock driver */ 1124 ravb_ptp_stop(ndev); 1125 /* Wait for DMA stopping */ 1126 error = ravb_stop_dma(ndev); 1127 if (error) { 1128 netdev_err(ndev, 1129 "cannot set ringparam! Any AVB processes are still running?\n"); 1130 return error; 1131 } 1132 synchronize_irq(ndev->irq); 1133 1134 /* Free all the skb's in the RX queue and the DMA buffers. */ 1135 ravb_ring_free(ndev, RAVB_BE); 1136 ravb_ring_free(ndev, RAVB_NC); 1137 } 1138 1139 /* Set new parameters */ 1140 priv->num_rx_ring[RAVB_BE] = ring->rx_pending; 1141 priv->num_tx_ring[RAVB_BE] = ring->tx_pending; 1142 1143 if (netif_running(ndev)) { 1144 error = ravb_dmac_init(ndev); 1145 if (error) { 1146 netdev_err(ndev, 1147 "%s: ravb_dmac_init() failed, error %d\n", 1148 __func__, error); 1149 return error; 1150 } 1151 1152 ravb_emac_init(ndev); 1153 1154 /* Initialise PTP Clock driver */ 1155 ravb_ptp_init(ndev, priv->pdev); 1156 1157 netif_device_attach(ndev); 1158 } 1159 1160 return 0; 1161 } 1162 1163 static int ravb_get_ts_info(struct net_device *ndev, 1164 struct ethtool_ts_info *info) 1165 { 1166 struct ravb_private *priv = netdev_priv(ndev); 1167 1168 info->so_timestamping = 1169 SOF_TIMESTAMPING_TX_SOFTWARE | 1170 SOF_TIMESTAMPING_RX_SOFTWARE | 1171 SOF_TIMESTAMPING_SOFTWARE | 1172 SOF_TIMESTAMPING_TX_HARDWARE | 1173 SOF_TIMESTAMPING_RX_HARDWARE | 1174 SOF_TIMESTAMPING_RAW_HARDWARE; 1175 info->tx_types = (1 << HWTSTAMP_TX_OFF) | (1 << HWTSTAMP_TX_ON); 1176 info->rx_filters = 1177 (1 << HWTSTAMP_FILTER_NONE) | 1178 (1 << HWTSTAMP_FILTER_PTP_V2_L2_EVENT) | 1179 (1 << HWTSTAMP_FILTER_ALL); 1180 info->phc_index = ptp_clock_index(priv->ptp.clock); 1181 1182 return 0; 1183 } 1184 1185 static const struct ethtool_ops ravb_ethtool_ops = { 1186 .get_settings = ravb_get_settings, 1187 .set_settings = ravb_set_settings, 1188 .nway_reset = ravb_nway_reset, 1189 .get_msglevel = ravb_get_msglevel, 1190 .set_msglevel = ravb_set_msglevel, 1191 .get_link = ethtool_op_get_link, 1192 .get_strings = ravb_get_strings, 1193 .get_ethtool_stats = ravb_get_ethtool_stats, 1194 .get_sset_count = ravb_get_sset_count, 1195 .get_ringparam = ravb_get_ringparam, 1196 .set_ringparam = ravb_set_ringparam, 1197 .get_ts_info = ravb_get_ts_info, 1198 }; 1199 1200 /* Network device open function for Ethernet AVB */ 1201 static int ravb_open(struct net_device *ndev) 1202 { 1203 struct ravb_private *priv = netdev_priv(ndev); 1204 int error; 1205 1206 napi_enable(&priv->napi[RAVB_BE]); 1207 napi_enable(&priv->napi[RAVB_NC]); 1208 1209 error = request_irq(ndev->irq, ravb_interrupt, IRQF_SHARED, ndev->name, 1210 ndev); 1211 if (error) { 1212 netdev_err(ndev, "cannot request IRQ\n"); 1213 goto out_napi_off; 1214 } 1215 1216 if (priv->chip_id == RCAR_GEN3) { 1217 error = request_irq(priv->emac_irq, ravb_interrupt, 1218 IRQF_SHARED, ndev->name, ndev); 1219 if (error) { 1220 netdev_err(ndev, "cannot request IRQ\n"); 1221 goto out_free_irq; 1222 } 1223 } 1224 1225 /* Device init */ 1226 error = ravb_dmac_init(ndev); 1227 if (error) 1228 goto out_free_irq; 1229 ravb_emac_init(ndev); 1230 1231 /* Initialise PTP Clock driver */ 1232 ravb_ptp_init(ndev, priv->pdev); 1233 1234 netif_tx_start_all_queues(ndev); 1235 1236 /* PHY control start */ 1237 error = ravb_phy_start(ndev); 1238 if (error) 1239 goto out_ptp_stop; 1240 1241 return 0; 1242 1243 out_ptp_stop: 1244 /* Stop PTP Clock driver */ 1245 ravb_ptp_stop(ndev); 1246 out_free_irq: 1247 free_irq(ndev->irq, ndev); 1248 free_irq(priv->emac_irq, ndev); 1249 out_napi_off: 1250 napi_disable(&priv->napi[RAVB_NC]); 1251 napi_disable(&priv->napi[RAVB_BE]); 1252 return error; 1253 } 1254 1255 /* Timeout function for Ethernet AVB */ 1256 static void ravb_tx_timeout(struct net_device *ndev) 1257 { 1258 struct ravb_private *priv = netdev_priv(ndev); 1259 1260 netif_err(priv, tx_err, ndev, 1261 "transmit timed out, status %08x, resetting...\n", 1262 ravb_read(ndev, ISS)); 1263 1264 /* tx_errors count up */ 1265 ndev->stats.tx_errors++; 1266 1267 schedule_work(&priv->work); 1268 } 1269 1270 static void ravb_tx_timeout_work(struct work_struct *work) 1271 { 1272 struct ravb_private *priv = container_of(work, struct ravb_private, 1273 work); 1274 struct net_device *ndev = priv->ndev; 1275 1276 netif_tx_stop_all_queues(ndev); 1277 1278 /* Stop PTP Clock driver */ 1279 ravb_ptp_stop(ndev); 1280 1281 /* Wait for DMA stopping */ 1282 ravb_stop_dma(ndev); 1283 1284 ravb_ring_free(ndev, RAVB_BE); 1285 ravb_ring_free(ndev, RAVB_NC); 1286 1287 /* Device init */ 1288 ravb_dmac_init(ndev); 1289 ravb_emac_init(ndev); 1290 1291 /* Initialise PTP Clock driver */ 1292 ravb_ptp_init(ndev, priv->pdev); 1293 1294 netif_tx_start_all_queues(ndev); 1295 } 1296 1297 /* Packet transmit function for Ethernet AVB */ 1298 static netdev_tx_t ravb_start_xmit(struct sk_buff *skb, struct net_device *ndev) 1299 { 1300 struct ravb_private *priv = netdev_priv(ndev); 1301 u16 q = skb_get_queue_mapping(skb); 1302 struct ravb_tstamp_skb *ts_skb; 1303 struct ravb_tx_desc *desc; 1304 unsigned long flags; 1305 u32 dma_addr; 1306 void *buffer; 1307 u32 entry; 1308 u32 len; 1309 1310 spin_lock_irqsave(&priv->lock, flags); 1311 if (priv->cur_tx[q] - priv->dirty_tx[q] > (priv->num_tx_ring[q] - 1) * 1312 NUM_TX_DESC) { 1313 netif_err(priv, tx_queued, ndev, 1314 "still transmitting with the full ring!\n"); 1315 netif_stop_subqueue(ndev, q); 1316 spin_unlock_irqrestore(&priv->lock, flags); 1317 return NETDEV_TX_BUSY; 1318 } 1319 entry = priv->cur_tx[q] % (priv->num_tx_ring[q] * NUM_TX_DESC); 1320 priv->tx_skb[q][entry / NUM_TX_DESC] = skb; 1321 1322 if (skb_put_padto(skb, ETH_ZLEN)) 1323 goto drop; 1324 1325 buffer = PTR_ALIGN(priv->tx_align[q], DPTR_ALIGN) + 1326 entry / NUM_TX_DESC * DPTR_ALIGN; 1327 len = PTR_ALIGN(skb->data, DPTR_ALIGN) - skb->data; 1328 memcpy(buffer, skb->data, len); 1329 dma_addr = dma_map_single(ndev->dev.parent, buffer, len, DMA_TO_DEVICE); 1330 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 1331 goto drop; 1332 1333 desc = &priv->tx_ring[q][entry]; 1334 desc->ds_tagl = cpu_to_le16(len); 1335 desc->dptr = cpu_to_le32(dma_addr); 1336 1337 buffer = skb->data + len; 1338 len = skb->len - len; 1339 dma_addr = dma_map_single(ndev->dev.parent, buffer, len, DMA_TO_DEVICE); 1340 if (dma_mapping_error(ndev->dev.parent, dma_addr)) 1341 goto unmap; 1342 1343 desc++; 1344 desc->ds_tagl = cpu_to_le16(len); 1345 desc->dptr = cpu_to_le32(dma_addr); 1346 1347 /* TX timestamp required */ 1348 if (q == RAVB_NC) { 1349 ts_skb = kmalloc(sizeof(*ts_skb), GFP_ATOMIC); 1350 if (!ts_skb) { 1351 desc--; 1352 dma_unmap_single(ndev->dev.parent, dma_addr, len, 1353 DMA_TO_DEVICE); 1354 goto unmap; 1355 } 1356 ts_skb->skb = skb; 1357 ts_skb->tag = priv->ts_skb_tag++; 1358 priv->ts_skb_tag &= 0x3ff; 1359 list_add_tail(&ts_skb->list, &priv->ts_skb_list); 1360 1361 /* TAG and timestamp required flag */ 1362 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; 1363 skb_tx_timestamp(skb); 1364 desc->tagh_tsr = (ts_skb->tag >> 4) | TX_TSR; 1365 desc->ds_tagl |= le16_to_cpu(ts_skb->tag << 12); 1366 } 1367 1368 /* Descriptor type must be set after all the above writes */ 1369 dma_wmb(); 1370 desc->die_dt = DT_FEND; 1371 desc--; 1372 desc->die_dt = DT_FSTART; 1373 1374 ravb_write(ndev, ravb_read(ndev, TCCR) | (TCCR_TSRQ0 << q), TCCR); 1375 1376 priv->cur_tx[q] += NUM_TX_DESC; 1377 if (priv->cur_tx[q] - priv->dirty_tx[q] > 1378 (priv->num_tx_ring[q] - 1) * NUM_TX_DESC && !ravb_tx_free(ndev, q)) 1379 netif_stop_subqueue(ndev, q); 1380 1381 exit: 1382 mmiowb(); 1383 spin_unlock_irqrestore(&priv->lock, flags); 1384 return NETDEV_TX_OK; 1385 1386 unmap: 1387 dma_unmap_single(ndev->dev.parent, le32_to_cpu(desc->dptr), 1388 le16_to_cpu(desc->ds_tagl), DMA_TO_DEVICE); 1389 drop: 1390 dev_kfree_skb_any(skb); 1391 priv->tx_skb[q][entry / NUM_TX_DESC] = NULL; 1392 goto exit; 1393 } 1394 1395 static u16 ravb_select_queue(struct net_device *ndev, struct sk_buff *skb, 1396 void *accel_priv, select_queue_fallback_t fallback) 1397 { 1398 /* If skb needs TX timestamp, it is handled in network control queue */ 1399 return (skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) ? RAVB_NC : 1400 RAVB_BE; 1401 1402 } 1403 1404 static struct net_device_stats *ravb_get_stats(struct net_device *ndev) 1405 { 1406 struct ravb_private *priv = netdev_priv(ndev); 1407 struct net_device_stats *nstats, *stats0, *stats1; 1408 1409 nstats = &ndev->stats; 1410 stats0 = &priv->stats[RAVB_BE]; 1411 stats1 = &priv->stats[RAVB_NC]; 1412 1413 nstats->tx_dropped += ravb_read(ndev, TROCR); 1414 ravb_write(ndev, 0, TROCR); /* (write clear) */ 1415 nstats->collisions += ravb_read(ndev, CDCR); 1416 ravb_write(ndev, 0, CDCR); /* (write clear) */ 1417 nstats->tx_carrier_errors += ravb_read(ndev, LCCR); 1418 ravb_write(ndev, 0, LCCR); /* (write clear) */ 1419 1420 nstats->tx_carrier_errors += ravb_read(ndev, CERCR); 1421 ravb_write(ndev, 0, CERCR); /* (write clear) */ 1422 nstats->tx_carrier_errors += ravb_read(ndev, CEECR); 1423 ravb_write(ndev, 0, CEECR); /* (write clear) */ 1424 1425 nstats->rx_packets = stats0->rx_packets + stats1->rx_packets; 1426 nstats->tx_packets = stats0->tx_packets + stats1->tx_packets; 1427 nstats->rx_bytes = stats0->rx_bytes + stats1->rx_bytes; 1428 nstats->tx_bytes = stats0->tx_bytes + stats1->tx_bytes; 1429 nstats->multicast = stats0->multicast + stats1->multicast; 1430 nstats->rx_errors = stats0->rx_errors + stats1->rx_errors; 1431 nstats->rx_crc_errors = stats0->rx_crc_errors + stats1->rx_crc_errors; 1432 nstats->rx_frame_errors = 1433 stats0->rx_frame_errors + stats1->rx_frame_errors; 1434 nstats->rx_length_errors = 1435 stats0->rx_length_errors + stats1->rx_length_errors; 1436 nstats->rx_missed_errors = 1437 stats0->rx_missed_errors + stats1->rx_missed_errors; 1438 nstats->rx_over_errors = 1439 stats0->rx_over_errors + stats1->rx_over_errors; 1440 1441 return nstats; 1442 } 1443 1444 /* Update promiscuous bit */ 1445 static void ravb_set_rx_mode(struct net_device *ndev) 1446 { 1447 struct ravb_private *priv = netdev_priv(ndev); 1448 unsigned long flags; 1449 u32 ecmr; 1450 1451 spin_lock_irqsave(&priv->lock, flags); 1452 ecmr = ravb_read(ndev, ECMR); 1453 if (ndev->flags & IFF_PROMISC) 1454 ecmr |= ECMR_PRM; 1455 else 1456 ecmr &= ~ECMR_PRM; 1457 ravb_write(ndev, ecmr, ECMR); 1458 mmiowb(); 1459 spin_unlock_irqrestore(&priv->lock, flags); 1460 } 1461 1462 /* Device close function for Ethernet AVB */ 1463 static int ravb_close(struct net_device *ndev) 1464 { 1465 struct ravb_private *priv = netdev_priv(ndev); 1466 struct ravb_tstamp_skb *ts_skb, *ts_skb2; 1467 1468 netif_tx_stop_all_queues(ndev); 1469 1470 /* Disable interrupts by clearing the interrupt masks. */ 1471 ravb_write(ndev, 0, RIC0); 1472 ravb_write(ndev, 0, RIC1); 1473 ravb_write(ndev, 0, RIC2); 1474 ravb_write(ndev, 0, TIC); 1475 1476 /* Stop PTP Clock driver */ 1477 ravb_ptp_stop(ndev); 1478 1479 /* Set the config mode to stop the AVB-DMAC's processes */ 1480 if (ravb_stop_dma(ndev) < 0) 1481 netdev_err(ndev, 1482 "device will be stopped after h/w processes are done.\n"); 1483 1484 /* Clear the timestamp list */ 1485 list_for_each_entry_safe(ts_skb, ts_skb2, &priv->ts_skb_list, list) { 1486 list_del(&ts_skb->list); 1487 kfree(ts_skb); 1488 } 1489 1490 /* PHY disconnect */ 1491 if (priv->phydev) { 1492 phy_stop(priv->phydev); 1493 phy_disconnect(priv->phydev); 1494 priv->phydev = NULL; 1495 } 1496 1497 free_irq(ndev->irq, ndev); 1498 1499 napi_disable(&priv->napi[RAVB_NC]); 1500 napi_disable(&priv->napi[RAVB_BE]); 1501 1502 /* Free all the skb's in the RX queue and the DMA buffers. */ 1503 ravb_ring_free(ndev, RAVB_BE); 1504 ravb_ring_free(ndev, RAVB_NC); 1505 1506 return 0; 1507 } 1508 1509 static int ravb_hwtstamp_get(struct net_device *ndev, struct ifreq *req) 1510 { 1511 struct ravb_private *priv = netdev_priv(ndev); 1512 struct hwtstamp_config config; 1513 1514 config.flags = 0; 1515 config.tx_type = priv->tstamp_tx_ctrl ? HWTSTAMP_TX_ON : 1516 HWTSTAMP_TX_OFF; 1517 if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_V2_L2_EVENT) 1518 config.rx_filter = HWTSTAMP_FILTER_PTP_V2_L2_EVENT; 1519 else if (priv->tstamp_rx_ctrl & RAVB_RXTSTAMP_TYPE_ALL) 1520 config.rx_filter = HWTSTAMP_FILTER_ALL; 1521 else 1522 config.rx_filter = HWTSTAMP_FILTER_NONE; 1523 1524 return copy_to_user(req->ifr_data, &config, sizeof(config)) ? 1525 -EFAULT : 0; 1526 } 1527 1528 /* Control hardware time stamping */ 1529 static int ravb_hwtstamp_set(struct net_device *ndev, struct ifreq *req) 1530 { 1531 struct ravb_private *priv = netdev_priv(ndev); 1532 struct hwtstamp_config config; 1533 u32 tstamp_rx_ctrl = RAVB_RXTSTAMP_ENABLED; 1534 u32 tstamp_tx_ctrl; 1535 1536 if (copy_from_user(&config, req->ifr_data, sizeof(config))) 1537 return -EFAULT; 1538 1539 /* Reserved for future extensions */ 1540 if (config.flags) 1541 return -EINVAL; 1542 1543 switch (config.tx_type) { 1544 case HWTSTAMP_TX_OFF: 1545 tstamp_tx_ctrl = 0; 1546 break; 1547 case HWTSTAMP_TX_ON: 1548 tstamp_tx_ctrl = RAVB_TXTSTAMP_ENABLED; 1549 break; 1550 default: 1551 return -ERANGE; 1552 } 1553 1554 switch (config.rx_filter) { 1555 case HWTSTAMP_FILTER_NONE: 1556 tstamp_rx_ctrl = 0; 1557 break; 1558 case HWTSTAMP_FILTER_PTP_V2_L2_EVENT: 1559 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_V2_L2_EVENT; 1560 break; 1561 default: 1562 config.rx_filter = HWTSTAMP_FILTER_ALL; 1563 tstamp_rx_ctrl |= RAVB_RXTSTAMP_TYPE_ALL; 1564 } 1565 1566 priv->tstamp_tx_ctrl = tstamp_tx_ctrl; 1567 priv->tstamp_rx_ctrl = tstamp_rx_ctrl; 1568 1569 return copy_to_user(req->ifr_data, &config, sizeof(config)) ? 1570 -EFAULT : 0; 1571 } 1572 1573 /* ioctl to device function */ 1574 static int ravb_do_ioctl(struct net_device *ndev, struct ifreq *req, int cmd) 1575 { 1576 struct ravb_private *priv = netdev_priv(ndev); 1577 struct phy_device *phydev = priv->phydev; 1578 1579 if (!netif_running(ndev)) 1580 return -EINVAL; 1581 1582 if (!phydev) 1583 return -ENODEV; 1584 1585 switch (cmd) { 1586 case SIOCGHWTSTAMP: 1587 return ravb_hwtstamp_get(ndev, req); 1588 case SIOCSHWTSTAMP: 1589 return ravb_hwtstamp_set(ndev, req); 1590 } 1591 1592 return phy_mii_ioctl(phydev, req, cmd); 1593 } 1594 1595 static const struct net_device_ops ravb_netdev_ops = { 1596 .ndo_open = ravb_open, 1597 .ndo_stop = ravb_close, 1598 .ndo_start_xmit = ravb_start_xmit, 1599 .ndo_select_queue = ravb_select_queue, 1600 .ndo_get_stats = ravb_get_stats, 1601 .ndo_set_rx_mode = ravb_set_rx_mode, 1602 .ndo_tx_timeout = ravb_tx_timeout, 1603 .ndo_do_ioctl = ravb_do_ioctl, 1604 .ndo_validate_addr = eth_validate_addr, 1605 .ndo_set_mac_address = eth_mac_addr, 1606 .ndo_change_mtu = eth_change_mtu, 1607 }; 1608 1609 /* MDIO bus init function */ 1610 static int ravb_mdio_init(struct ravb_private *priv) 1611 { 1612 struct platform_device *pdev = priv->pdev; 1613 struct device *dev = &pdev->dev; 1614 int error; 1615 1616 /* Bitbang init */ 1617 priv->mdiobb.ops = &bb_ops; 1618 1619 /* MII controller setting */ 1620 priv->mii_bus = alloc_mdio_bitbang(&priv->mdiobb); 1621 if (!priv->mii_bus) 1622 return -ENOMEM; 1623 1624 /* Hook up MII support for ethtool */ 1625 priv->mii_bus->name = "ravb_mii"; 1626 priv->mii_bus->parent = dev; 1627 snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x", 1628 pdev->name, pdev->id); 1629 1630 /* Register MDIO bus */ 1631 error = of_mdiobus_register(priv->mii_bus, dev->of_node); 1632 if (error) 1633 goto out_free_bus; 1634 1635 return 0; 1636 1637 out_free_bus: 1638 free_mdio_bitbang(priv->mii_bus); 1639 return error; 1640 } 1641 1642 /* MDIO bus release function */ 1643 static int ravb_mdio_release(struct ravb_private *priv) 1644 { 1645 /* Unregister mdio bus */ 1646 mdiobus_unregister(priv->mii_bus); 1647 1648 /* Free bitbang info */ 1649 free_mdio_bitbang(priv->mii_bus); 1650 1651 return 0; 1652 } 1653 1654 static const struct of_device_id ravb_match_table[] = { 1655 { .compatible = "renesas,etheravb-r8a7790", .data = (void *)RCAR_GEN2 }, 1656 { .compatible = "renesas,etheravb-r8a7794", .data = (void *)RCAR_GEN2 }, 1657 { .compatible = "renesas,etheravb-r8a7795", .data = (void *)RCAR_GEN3 }, 1658 { } 1659 }; 1660 MODULE_DEVICE_TABLE(of, ravb_match_table); 1661 1662 static int ravb_probe(struct platform_device *pdev) 1663 { 1664 struct device_node *np = pdev->dev.of_node; 1665 const struct of_device_id *match; 1666 struct ravb_private *priv; 1667 enum ravb_chip_id chip_id; 1668 struct net_device *ndev; 1669 int error, irq, q; 1670 struct resource *res; 1671 1672 if (!np) { 1673 dev_err(&pdev->dev, 1674 "this driver is required to be instantiated from device tree\n"); 1675 return -EINVAL; 1676 } 1677 1678 /* Get base address */ 1679 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1680 if (!res) { 1681 dev_err(&pdev->dev, "invalid resource\n"); 1682 return -EINVAL; 1683 } 1684 1685 ndev = alloc_etherdev_mqs(sizeof(struct ravb_private), 1686 NUM_TX_QUEUE, NUM_RX_QUEUE); 1687 if (!ndev) 1688 return -ENOMEM; 1689 1690 pm_runtime_enable(&pdev->dev); 1691 pm_runtime_get_sync(&pdev->dev); 1692 1693 /* The Ether-specific entries in the device structure. */ 1694 ndev->base_addr = res->start; 1695 ndev->dma = -1; 1696 1697 match = of_match_device(of_match_ptr(ravb_match_table), &pdev->dev); 1698 chip_id = (enum ravb_chip_id)match->data; 1699 1700 if (chip_id == RCAR_GEN3) 1701 irq = platform_get_irq_byname(pdev, "ch22"); 1702 else 1703 irq = platform_get_irq(pdev, 0); 1704 if (irq < 0) { 1705 error = irq; 1706 goto out_release; 1707 } 1708 ndev->irq = irq; 1709 1710 SET_NETDEV_DEV(ndev, &pdev->dev); 1711 1712 priv = netdev_priv(ndev); 1713 priv->ndev = ndev; 1714 priv->pdev = pdev; 1715 priv->num_tx_ring[RAVB_BE] = BE_TX_RING_SIZE; 1716 priv->num_rx_ring[RAVB_BE] = BE_RX_RING_SIZE; 1717 priv->num_tx_ring[RAVB_NC] = NC_TX_RING_SIZE; 1718 priv->num_rx_ring[RAVB_NC] = NC_RX_RING_SIZE; 1719 priv->addr = devm_ioremap_resource(&pdev->dev, res); 1720 if (IS_ERR(priv->addr)) { 1721 error = PTR_ERR(priv->addr); 1722 goto out_release; 1723 } 1724 1725 spin_lock_init(&priv->lock); 1726 INIT_WORK(&priv->work, ravb_tx_timeout_work); 1727 1728 priv->phy_interface = of_get_phy_mode(np); 1729 1730 priv->no_avb_link = of_property_read_bool(np, "renesas,no-ether-link"); 1731 priv->avb_link_active_low = 1732 of_property_read_bool(np, "renesas,ether-link-active-low"); 1733 1734 if (chip_id == RCAR_GEN3) { 1735 irq = platform_get_irq_byname(pdev, "ch24"); 1736 if (irq < 0) { 1737 error = irq; 1738 goto out_release; 1739 } 1740 priv->emac_irq = irq; 1741 } 1742 1743 priv->chip_id = chip_id; 1744 1745 /* Set function */ 1746 ndev->netdev_ops = &ravb_netdev_ops; 1747 ndev->ethtool_ops = &ravb_ethtool_ops; 1748 1749 /* Set AVB config mode */ 1750 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_OPC) | CCC_OPC_CONFIG, 1751 CCC); 1752 1753 /* Set CSEL value */ 1754 ravb_write(ndev, (ravb_read(ndev, CCC) & ~CCC_CSEL) | CCC_CSEL_HPB, 1755 CCC); 1756 1757 /* Set GTI value */ 1758 ravb_write(ndev, ((1000 << 20) / 130) & GTI_TIV, GTI); 1759 1760 /* Request GTI loading */ 1761 ravb_write(ndev, ravb_read(ndev, GCCR) | GCCR_LTI, GCCR); 1762 1763 /* Allocate descriptor base address table */ 1764 priv->desc_bat_size = sizeof(struct ravb_desc) * DBAT_ENTRY_NUM; 1765 priv->desc_bat = dma_alloc_coherent(ndev->dev.parent, priv->desc_bat_size, 1766 &priv->desc_bat_dma, GFP_KERNEL); 1767 if (!priv->desc_bat) { 1768 dev_err(&pdev->dev, 1769 "Cannot allocate desc base address table (size %d bytes)\n", 1770 priv->desc_bat_size); 1771 error = -ENOMEM; 1772 goto out_release; 1773 } 1774 for (q = RAVB_BE; q < DBAT_ENTRY_NUM; q++) 1775 priv->desc_bat[q].die_dt = DT_EOS; 1776 ravb_write(ndev, priv->desc_bat_dma, DBAT); 1777 1778 /* Initialise HW timestamp list */ 1779 INIT_LIST_HEAD(&priv->ts_skb_list); 1780 1781 /* Debug message level */ 1782 priv->msg_enable = RAVB_DEF_MSG_ENABLE; 1783 1784 /* Read and set MAC address */ 1785 ravb_read_mac_address(ndev, of_get_mac_address(np)); 1786 if (!is_valid_ether_addr(ndev->dev_addr)) { 1787 dev_warn(&pdev->dev, 1788 "no valid MAC address supplied, using a random one\n"); 1789 eth_hw_addr_random(ndev); 1790 } 1791 1792 /* MDIO bus init */ 1793 error = ravb_mdio_init(priv); 1794 if (error) { 1795 dev_err(&pdev->dev, "failed to initialize MDIO\n"); 1796 goto out_dma_free; 1797 } 1798 1799 netif_napi_add(ndev, &priv->napi[RAVB_BE], ravb_poll, 64); 1800 netif_napi_add(ndev, &priv->napi[RAVB_NC], ravb_poll, 64); 1801 1802 /* Network device register */ 1803 error = register_netdev(ndev); 1804 if (error) 1805 goto out_napi_del; 1806 1807 /* Print device information */ 1808 netdev_info(ndev, "Base address at %#x, %pM, IRQ %d.\n", 1809 (u32)ndev->base_addr, ndev->dev_addr, ndev->irq); 1810 1811 platform_set_drvdata(pdev, ndev); 1812 1813 return 0; 1814 1815 out_napi_del: 1816 netif_napi_del(&priv->napi[RAVB_NC]); 1817 netif_napi_del(&priv->napi[RAVB_BE]); 1818 ravb_mdio_release(priv); 1819 out_dma_free: 1820 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat, 1821 priv->desc_bat_dma); 1822 out_release: 1823 if (ndev) 1824 free_netdev(ndev); 1825 1826 pm_runtime_put(&pdev->dev); 1827 pm_runtime_disable(&pdev->dev); 1828 return error; 1829 } 1830 1831 static int ravb_remove(struct platform_device *pdev) 1832 { 1833 struct net_device *ndev = platform_get_drvdata(pdev); 1834 struct ravb_private *priv = netdev_priv(ndev); 1835 1836 dma_free_coherent(ndev->dev.parent, priv->desc_bat_size, priv->desc_bat, 1837 priv->desc_bat_dma); 1838 /* Set reset mode */ 1839 ravb_write(ndev, CCC_OPC_RESET, CCC); 1840 pm_runtime_put_sync(&pdev->dev); 1841 unregister_netdev(ndev); 1842 netif_napi_del(&priv->napi[RAVB_NC]); 1843 netif_napi_del(&priv->napi[RAVB_BE]); 1844 ravb_mdio_release(priv); 1845 pm_runtime_disable(&pdev->dev); 1846 free_netdev(ndev); 1847 platform_set_drvdata(pdev, NULL); 1848 1849 return 0; 1850 } 1851 1852 #ifdef CONFIG_PM 1853 static int ravb_runtime_nop(struct device *dev) 1854 { 1855 /* Runtime PM callback shared between ->runtime_suspend() 1856 * and ->runtime_resume(). Simply returns success. 1857 * 1858 * This driver re-initializes all registers after 1859 * pm_runtime_get_sync() anyway so there is no need 1860 * to save and restore registers here. 1861 */ 1862 return 0; 1863 } 1864 1865 static const struct dev_pm_ops ravb_dev_pm_ops = { 1866 .runtime_suspend = ravb_runtime_nop, 1867 .runtime_resume = ravb_runtime_nop, 1868 }; 1869 1870 #define RAVB_PM_OPS (&ravb_dev_pm_ops) 1871 #else 1872 #define RAVB_PM_OPS NULL 1873 #endif 1874 1875 static struct platform_driver ravb_driver = { 1876 .probe = ravb_probe, 1877 .remove = ravb_remove, 1878 .driver = { 1879 .name = "ravb", 1880 .pm = RAVB_PM_OPS, 1881 .of_match_table = ravb_match_table, 1882 }, 1883 }; 1884 1885 module_platform_driver(ravb_driver); 1886 1887 MODULE_AUTHOR("Mitsuhiro Kimura, Masaru Nagai"); 1888 MODULE_DESCRIPTION("Renesas Ethernet AVB driver"); 1889 MODULE_LICENSE("GPL v2"); 1890