1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2016-2017, National Instruments Corp. 3 * 4 * Author: Moritz Fischer <mdf@kernel.org> 5 */ 6 7 #include <linux/etherdevice.h> 8 #include <linux/module.h> 9 #include <linux/netdevice.h> 10 #include <linux/of_address.h> 11 #include <linux/of_mdio.h> 12 #include <linux/of_net.h> 13 #include <linux/of_platform.h> 14 #include <linux/of_irq.h> 15 #include <linux/skbuff.h> 16 #include <linux/phy.h> 17 #include <linux/mii.h> 18 #include <linux/nvmem-consumer.h> 19 #include <linux/ethtool.h> 20 #include <linux/iopoll.h> 21 22 #define TX_BD_NUM 64 23 #define RX_BD_NUM 128 24 25 /* Axi DMA Register definitions */ 26 #define XAXIDMA_TX_CR_OFFSET 0x00 /* Channel control */ 27 #define XAXIDMA_TX_SR_OFFSET 0x04 /* Status */ 28 #define XAXIDMA_TX_CDESC_OFFSET 0x08 /* Current descriptor pointer */ 29 #define XAXIDMA_TX_TDESC_OFFSET 0x10 /* Tail descriptor pointer */ 30 31 #define XAXIDMA_RX_CR_OFFSET 0x30 /* Channel control */ 32 #define XAXIDMA_RX_SR_OFFSET 0x34 /* Status */ 33 #define XAXIDMA_RX_CDESC_OFFSET 0x38 /* Current descriptor pointer */ 34 #define XAXIDMA_RX_TDESC_OFFSET 0x40 /* Tail descriptor pointer */ 35 36 #define XAXIDMA_CR_RUNSTOP_MASK 0x1 /* Start/stop DMA channel */ 37 #define XAXIDMA_CR_RESET_MASK 0x4 /* Reset DMA engine */ 38 39 #define XAXIDMA_BD_CTRL_LENGTH_MASK 0x007FFFFF /* Requested len */ 40 #define XAXIDMA_BD_CTRL_TXSOF_MASK 0x08000000 /* First tx packet */ 41 #define XAXIDMA_BD_CTRL_TXEOF_MASK 0x04000000 /* Last tx packet */ 42 #define XAXIDMA_BD_CTRL_ALL_MASK 0x0C000000 /* All control bits */ 43 44 #define XAXIDMA_DELAY_MASK 0xFF000000 /* Delay timeout counter */ 45 #define XAXIDMA_COALESCE_MASK 0x00FF0000 /* Coalesce counter */ 46 47 #define XAXIDMA_DELAY_SHIFT 24 48 #define XAXIDMA_COALESCE_SHIFT 16 49 50 #define XAXIDMA_IRQ_IOC_MASK 0x00001000 /* Completion intr */ 51 #define XAXIDMA_IRQ_DELAY_MASK 0x00002000 /* Delay interrupt */ 52 #define XAXIDMA_IRQ_ERROR_MASK 0x00004000 /* Error interrupt */ 53 #define XAXIDMA_IRQ_ALL_MASK 0x00007000 /* All interrupts */ 54 55 /* Default TX/RX Threshold and waitbound values for SGDMA mode */ 56 #define XAXIDMA_DFT_TX_THRESHOLD 24 57 #define XAXIDMA_DFT_TX_WAITBOUND 254 58 #define XAXIDMA_DFT_RX_THRESHOLD 24 59 #define XAXIDMA_DFT_RX_WAITBOUND 254 60 61 #define XAXIDMA_BD_STS_ACTUAL_LEN_MASK 0x007FFFFF /* Actual len */ 62 #define XAXIDMA_BD_STS_COMPLETE_MASK 0x80000000 /* Completed */ 63 #define XAXIDMA_BD_STS_DEC_ERR_MASK 0x40000000 /* Decode error */ 64 #define XAXIDMA_BD_STS_SLV_ERR_MASK 0x20000000 /* Slave error */ 65 #define XAXIDMA_BD_STS_INT_ERR_MASK 0x10000000 /* Internal err */ 66 #define XAXIDMA_BD_STS_ALL_ERR_MASK 0x70000000 /* All errors */ 67 #define XAXIDMA_BD_STS_RXSOF_MASK 0x08000000 /* First rx pkt */ 68 #define XAXIDMA_BD_STS_RXEOF_MASK 0x04000000 /* Last rx pkt */ 69 #define XAXIDMA_BD_STS_ALL_MASK 0xFC000000 /* All status bits */ 70 71 #define NIXGE_REG_CTRL_OFFSET 0x4000 72 #define NIXGE_REG_INFO 0x00 73 #define NIXGE_REG_MAC_CTL 0x04 74 #define NIXGE_REG_PHY_CTL 0x08 75 #define NIXGE_REG_LED_CTL 0x0c 76 #define NIXGE_REG_MDIO_DATA 0x10 77 #define NIXGE_REG_MDIO_ADDR 0x14 78 #define NIXGE_REG_MDIO_OP 0x18 79 #define NIXGE_REG_MDIO_CTRL 0x1c 80 81 #define NIXGE_ID_LED_CTL_EN BIT(0) 82 #define NIXGE_ID_LED_CTL_VAL BIT(1) 83 84 #define NIXGE_MDIO_CLAUSE45 BIT(12) 85 #define NIXGE_MDIO_CLAUSE22 0 86 #define NIXGE_MDIO_OP(n) (((n) & 0x3) << 10) 87 #define NIXGE_MDIO_OP_ADDRESS 0 88 #define NIXGE_MDIO_C45_WRITE BIT(0) 89 #define NIXGE_MDIO_C45_READ (BIT(1) | BIT(0)) 90 #define NIXGE_MDIO_C22_WRITE BIT(0) 91 #define NIXGE_MDIO_C22_READ BIT(1) 92 #define NIXGE_MDIO_ADDR(n) (((n) & 0x1f) << 5) 93 #define NIXGE_MDIO_MMD(n) (((n) & 0x1f) << 0) 94 95 #define NIXGE_REG_MAC_LSB 0x1000 96 #define NIXGE_REG_MAC_MSB 0x1004 97 98 /* Packet size info */ 99 #define NIXGE_HDR_SIZE 14 /* Size of Ethernet header */ 100 #define NIXGE_TRL_SIZE 4 /* Size of Ethernet trailer (FCS) */ 101 #define NIXGE_MTU 1500 /* Max MTU of an Ethernet frame */ 102 #define NIXGE_JUMBO_MTU 9000 /* Max MTU of a jumbo Eth. frame */ 103 104 #define NIXGE_MAX_FRAME_SIZE (NIXGE_MTU + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE) 105 #define NIXGE_MAX_JUMBO_FRAME_SIZE \ 106 (NIXGE_JUMBO_MTU + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE) 107 108 enum nixge_version { 109 NIXGE_V2, 110 NIXGE_V3, 111 NIXGE_VERSION_COUNT 112 }; 113 114 struct nixge_hw_dma_bd { 115 u32 next_lo; 116 u32 next_hi; 117 u32 phys_lo; 118 u32 phys_hi; 119 u32 reserved3; 120 u32 reserved4; 121 u32 cntrl; 122 u32 status; 123 u32 app0; 124 u32 app1; 125 u32 app2; 126 u32 app3; 127 u32 app4; 128 u32 sw_id_offset_lo; 129 u32 sw_id_offset_hi; 130 u32 reserved6; 131 }; 132 133 #ifdef CONFIG_PHYS_ADDR_T_64BIT 134 #define nixge_hw_dma_bd_set_addr(bd, field, addr) \ 135 do { \ 136 (bd)->field##_lo = lower_32_bits((addr)); \ 137 (bd)->field##_hi = upper_32_bits((addr)); \ 138 } while (0) 139 #else 140 #define nixge_hw_dma_bd_set_addr(bd, field, addr) \ 141 ((bd)->field##_lo = lower_32_bits((addr))) 142 #endif 143 144 #define nixge_hw_dma_bd_set_phys(bd, addr) \ 145 nixge_hw_dma_bd_set_addr((bd), phys, (addr)) 146 147 #define nixge_hw_dma_bd_set_next(bd, addr) \ 148 nixge_hw_dma_bd_set_addr((bd), next, (addr)) 149 150 #define nixge_hw_dma_bd_set_offset(bd, addr) \ 151 nixge_hw_dma_bd_set_addr((bd), sw_id_offset, (addr)) 152 153 #ifdef CONFIG_PHYS_ADDR_T_64BIT 154 #define nixge_hw_dma_bd_get_addr(bd, field) \ 155 (dma_addr_t)((((u64)(bd)->field##_hi) << 32) | ((bd)->field##_lo)) 156 #else 157 #define nixge_hw_dma_bd_get_addr(bd, field) \ 158 (dma_addr_t)((bd)->field##_lo) 159 #endif 160 161 struct nixge_tx_skb { 162 struct sk_buff *skb; 163 dma_addr_t mapping; 164 size_t size; 165 bool mapped_as_page; 166 }; 167 168 struct nixge_priv { 169 struct net_device *ndev; 170 struct napi_struct napi; 171 struct device *dev; 172 173 /* Connection to PHY device */ 174 struct device_node *phy_node; 175 phy_interface_t phy_mode; 176 177 int link; 178 unsigned int speed; 179 unsigned int duplex; 180 181 /* MDIO bus data */ 182 struct mii_bus *mii_bus; /* MII bus reference */ 183 184 /* IO registers, dma functions and IRQs */ 185 void __iomem *ctrl_regs; 186 void __iomem *dma_regs; 187 188 struct tasklet_struct dma_err_tasklet; 189 190 int tx_irq; 191 int rx_irq; 192 193 /* Buffer descriptors */ 194 struct nixge_hw_dma_bd *tx_bd_v; 195 struct nixge_tx_skb *tx_skb; 196 dma_addr_t tx_bd_p; 197 198 struct nixge_hw_dma_bd *rx_bd_v; 199 dma_addr_t rx_bd_p; 200 u32 tx_bd_ci; 201 u32 tx_bd_tail; 202 u32 rx_bd_ci; 203 204 u32 coalesce_count_rx; 205 u32 coalesce_count_tx; 206 }; 207 208 static void nixge_dma_write_reg(struct nixge_priv *priv, off_t offset, u32 val) 209 { 210 writel(val, priv->dma_regs + offset); 211 } 212 213 static void nixge_dma_write_desc_reg(struct nixge_priv *priv, off_t offset, 214 dma_addr_t addr) 215 { 216 writel(lower_32_bits(addr), priv->dma_regs + offset); 217 #ifdef CONFIG_PHYS_ADDR_T_64BIT 218 writel(upper_32_bits(addr), priv->dma_regs + offset + 4); 219 #endif 220 } 221 222 static u32 nixge_dma_read_reg(const struct nixge_priv *priv, off_t offset) 223 { 224 return readl(priv->dma_regs + offset); 225 } 226 227 static void nixge_ctrl_write_reg(struct nixge_priv *priv, off_t offset, u32 val) 228 { 229 writel(val, priv->ctrl_regs + offset); 230 } 231 232 static u32 nixge_ctrl_read_reg(struct nixge_priv *priv, off_t offset) 233 { 234 return readl(priv->ctrl_regs + offset); 235 } 236 237 #define nixge_ctrl_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \ 238 readl_poll_timeout((priv)->ctrl_regs + (addr), (val), (cond), \ 239 (sleep_us), (timeout_us)) 240 241 #define nixge_dma_poll_timeout(priv, addr, val, cond, sleep_us, timeout_us) \ 242 readl_poll_timeout((priv)->dma_regs + (addr), (val), (cond), \ 243 (sleep_us), (timeout_us)) 244 245 static void nixge_hw_dma_bd_release(struct net_device *ndev) 246 { 247 struct nixge_priv *priv = netdev_priv(ndev); 248 dma_addr_t phys_addr; 249 struct sk_buff *skb; 250 int i; 251 252 for (i = 0; i < RX_BD_NUM; i++) { 253 phys_addr = nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[i], 254 phys); 255 256 dma_unmap_single(ndev->dev.parent, phys_addr, 257 NIXGE_MAX_JUMBO_FRAME_SIZE, 258 DMA_FROM_DEVICE); 259 260 skb = (struct sk_buff *)(uintptr_t) 261 nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[i], 262 sw_id_offset); 263 dev_kfree_skb(skb); 264 } 265 266 if (priv->rx_bd_v) 267 dma_free_coherent(ndev->dev.parent, 268 sizeof(*priv->rx_bd_v) * RX_BD_NUM, 269 priv->rx_bd_v, 270 priv->rx_bd_p); 271 272 if (priv->tx_skb) 273 devm_kfree(ndev->dev.parent, priv->tx_skb); 274 275 if (priv->tx_bd_v) 276 dma_free_coherent(ndev->dev.parent, 277 sizeof(*priv->tx_bd_v) * TX_BD_NUM, 278 priv->tx_bd_v, 279 priv->tx_bd_p); 280 } 281 282 static int nixge_hw_dma_bd_init(struct net_device *ndev) 283 { 284 struct nixge_priv *priv = netdev_priv(ndev); 285 struct sk_buff *skb; 286 dma_addr_t phys; 287 u32 cr; 288 int i; 289 290 /* Reset the indexes which are used for accessing the BDs */ 291 priv->tx_bd_ci = 0; 292 priv->tx_bd_tail = 0; 293 priv->rx_bd_ci = 0; 294 295 /* Allocate the Tx and Rx buffer descriptors. */ 296 priv->tx_bd_v = dma_alloc_coherent(ndev->dev.parent, 297 sizeof(*priv->tx_bd_v) * TX_BD_NUM, 298 &priv->tx_bd_p, GFP_KERNEL); 299 if (!priv->tx_bd_v) 300 goto out; 301 302 priv->tx_skb = devm_kcalloc(ndev->dev.parent, 303 TX_BD_NUM, sizeof(*priv->tx_skb), 304 GFP_KERNEL); 305 if (!priv->tx_skb) 306 goto out; 307 308 priv->rx_bd_v = dma_alloc_coherent(ndev->dev.parent, 309 sizeof(*priv->rx_bd_v) * RX_BD_NUM, 310 &priv->rx_bd_p, GFP_KERNEL); 311 if (!priv->rx_bd_v) 312 goto out; 313 314 for (i = 0; i < TX_BD_NUM; i++) { 315 nixge_hw_dma_bd_set_next(&priv->tx_bd_v[i], 316 priv->tx_bd_p + 317 sizeof(*priv->tx_bd_v) * 318 ((i + 1) % TX_BD_NUM)); 319 } 320 321 for (i = 0; i < RX_BD_NUM; i++) { 322 nixge_hw_dma_bd_set_next(&priv->rx_bd_v[i], 323 priv->rx_bd_p 324 + sizeof(*priv->rx_bd_v) * 325 ((i + 1) % RX_BD_NUM)); 326 327 skb = netdev_alloc_skb_ip_align(ndev, 328 NIXGE_MAX_JUMBO_FRAME_SIZE); 329 if (!skb) 330 goto out; 331 332 nixge_hw_dma_bd_set_offset(&priv->rx_bd_v[i], (uintptr_t)skb); 333 phys = dma_map_single(ndev->dev.parent, skb->data, 334 NIXGE_MAX_JUMBO_FRAME_SIZE, 335 DMA_FROM_DEVICE); 336 337 nixge_hw_dma_bd_set_phys(&priv->rx_bd_v[i], phys); 338 339 priv->rx_bd_v[i].cntrl = NIXGE_MAX_JUMBO_FRAME_SIZE; 340 } 341 342 /* Start updating the Rx channel control register */ 343 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET); 344 /* Update the interrupt coalesce count */ 345 cr = ((cr & ~XAXIDMA_COALESCE_MASK) | 346 ((priv->coalesce_count_rx) << XAXIDMA_COALESCE_SHIFT)); 347 /* Update the delay timer count */ 348 cr = ((cr & ~XAXIDMA_DELAY_MASK) | 349 (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT)); 350 /* Enable coalesce, delay timer and error interrupts */ 351 cr |= XAXIDMA_IRQ_ALL_MASK; 352 /* Write to the Rx channel control register */ 353 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr); 354 355 /* Start updating the Tx channel control register */ 356 cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET); 357 /* Update the interrupt coalesce count */ 358 cr = (((cr & ~XAXIDMA_COALESCE_MASK)) | 359 ((priv->coalesce_count_tx) << XAXIDMA_COALESCE_SHIFT)); 360 /* Update the delay timer count */ 361 cr = (((cr & ~XAXIDMA_DELAY_MASK)) | 362 (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT)); 363 /* Enable coalesce, delay timer and error interrupts */ 364 cr |= XAXIDMA_IRQ_ALL_MASK; 365 /* Write to the Tx channel control register */ 366 nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, cr); 367 368 /* Populate the tail pointer and bring the Rx Axi DMA engine out of 369 * halted state. This will make the Rx side ready for reception. 370 */ 371 nixge_dma_write_desc_reg(priv, XAXIDMA_RX_CDESC_OFFSET, priv->rx_bd_p); 372 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET); 373 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, 374 cr | XAXIDMA_CR_RUNSTOP_MASK); 375 nixge_dma_write_desc_reg(priv, XAXIDMA_RX_TDESC_OFFSET, priv->rx_bd_p + 376 (sizeof(*priv->rx_bd_v) * (RX_BD_NUM - 1))); 377 378 /* Write to the RS (Run-stop) bit in the Tx channel control register. 379 * Tx channel is now ready to run. But only after we write to the 380 * tail pointer register that the Tx channel will start transmitting. 381 */ 382 nixge_dma_write_desc_reg(priv, XAXIDMA_TX_CDESC_OFFSET, priv->tx_bd_p); 383 cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET); 384 nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, 385 cr | XAXIDMA_CR_RUNSTOP_MASK); 386 387 return 0; 388 out: 389 nixge_hw_dma_bd_release(ndev); 390 return -ENOMEM; 391 } 392 393 static void __nixge_device_reset(struct nixge_priv *priv, off_t offset) 394 { 395 u32 status; 396 int err; 397 398 /* Reset Axi DMA. This would reset NIXGE Ethernet core as well. 399 * The reset process of Axi DMA takes a while to complete as all 400 * pending commands/transfers will be flushed or completed during 401 * this reset process. 402 */ 403 nixge_dma_write_reg(priv, offset, XAXIDMA_CR_RESET_MASK); 404 err = nixge_dma_poll_timeout(priv, offset, status, 405 !(status & XAXIDMA_CR_RESET_MASK), 10, 406 1000); 407 if (err) 408 netdev_err(priv->ndev, "%s: DMA reset timeout!\n", __func__); 409 } 410 411 static void nixge_device_reset(struct net_device *ndev) 412 { 413 struct nixge_priv *priv = netdev_priv(ndev); 414 415 __nixge_device_reset(priv, XAXIDMA_TX_CR_OFFSET); 416 __nixge_device_reset(priv, XAXIDMA_RX_CR_OFFSET); 417 418 if (nixge_hw_dma_bd_init(ndev)) 419 netdev_err(ndev, "%s: descriptor allocation failed\n", 420 __func__); 421 422 netif_trans_update(ndev); 423 } 424 425 static void nixge_handle_link_change(struct net_device *ndev) 426 { 427 struct nixge_priv *priv = netdev_priv(ndev); 428 struct phy_device *phydev = ndev->phydev; 429 430 if (phydev->link != priv->link || phydev->speed != priv->speed || 431 phydev->duplex != priv->duplex) { 432 priv->link = phydev->link; 433 priv->speed = phydev->speed; 434 priv->duplex = phydev->duplex; 435 phy_print_status(phydev); 436 } 437 } 438 439 static void nixge_tx_skb_unmap(struct nixge_priv *priv, 440 struct nixge_tx_skb *tx_skb) 441 { 442 if (tx_skb->mapping) { 443 if (tx_skb->mapped_as_page) 444 dma_unmap_page(priv->ndev->dev.parent, tx_skb->mapping, 445 tx_skb->size, DMA_TO_DEVICE); 446 else 447 dma_unmap_single(priv->ndev->dev.parent, 448 tx_skb->mapping, 449 tx_skb->size, DMA_TO_DEVICE); 450 tx_skb->mapping = 0; 451 } 452 453 if (tx_skb->skb) { 454 dev_kfree_skb_any(tx_skb->skb); 455 tx_skb->skb = NULL; 456 } 457 } 458 459 static void nixge_start_xmit_done(struct net_device *ndev) 460 { 461 struct nixge_priv *priv = netdev_priv(ndev); 462 struct nixge_hw_dma_bd *cur_p; 463 struct nixge_tx_skb *tx_skb; 464 unsigned int status = 0; 465 u32 packets = 0; 466 u32 size = 0; 467 468 cur_p = &priv->tx_bd_v[priv->tx_bd_ci]; 469 tx_skb = &priv->tx_skb[priv->tx_bd_ci]; 470 471 status = cur_p->status; 472 473 while (status & XAXIDMA_BD_STS_COMPLETE_MASK) { 474 nixge_tx_skb_unmap(priv, tx_skb); 475 cur_p->status = 0; 476 477 size += status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK; 478 packets++; 479 480 ++priv->tx_bd_ci; 481 priv->tx_bd_ci %= TX_BD_NUM; 482 cur_p = &priv->tx_bd_v[priv->tx_bd_ci]; 483 tx_skb = &priv->tx_skb[priv->tx_bd_ci]; 484 status = cur_p->status; 485 } 486 487 ndev->stats.tx_packets += packets; 488 ndev->stats.tx_bytes += size; 489 490 if (packets) 491 netif_wake_queue(ndev); 492 } 493 494 static int nixge_check_tx_bd_space(struct nixge_priv *priv, 495 int num_frag) 496 { 497 struct nixge_hw_dma_bd *cur_p; 498 499 cur_p = &priv->tx_bd_v[(priv->tx_bd_tail + num_frag) % TX_BD_NUM]; 500 if (cur_p->status & XAXIDMA_BD_STS_ALL_MASK) 501 return NETDEV_TX_BUSY; 502 return 0; 503 } 504 505 static netdev_tx_t nixge_start_xmit(struct sk_buff *skb, 506 struct net_device *ndev) 507 { 508 struct nixge_priv *priv = netdev_priv(ndev); 509 struct nixge_hw_dma_bd *cur_p; 510 struct nixge_tx_skb *tx_skb; 511 dma_addr_t tail_p, cur_phys; 512 skb_frag_t *frag; 513 u32 num_frag; 514 u32 ii; 515 516 num_frag = skb_shinfo(skb)->nr_frags; 517 cur_p = &priv->tx_bd_v[priv->tx_bd_tail]; 518 tx_skb = &priv->tx_skb[priv->tx_bd_tail]; 519 520 if (nixge_check_tx_bd_space(priv, num_frag)) { 521 if (!netif_queue_stopped(ndev)) 522 netif_stop_queue(ndev); 523 return NETDEV_TX_OK; 524 } 525 526 cur_phys = dma_map_single(ndev->dev.parent, skb->data, 527 skb_headlen(skb), DMA_TO_DEVICE); 528 if (dma_mapping_error(ndev->dev.parent, cur_phys)) 529 goto drop; 530 nixge_hw_dma_bd_set_phys(cur_p, cur_phys); 531 532 cur_p->cntrl = skb_headlen(skb) | XAXIDMA_BD_CTRL_TXSOF_MASK; 533 534 tx_skb->skb = NULL; 535 tx_skb->mapping = cur_phys; 536 tx_skb->size = skb_headlen(skb); 537 tx_skb->mapped_as_page = false; 538 539 for (ii = 0; ii < num_frag; ii++) { 540 ++priv->tx_bd_tail; 541 priv->tx_bd_tail %= TX_BD_NUM; 542 cur_p = &priv->tx_bd_v[priv->tx_bd_tail]; 543 tx_skb = &priv->tx_skb[priv->tx_bd_tail]; 544 frag = &skb_shinfo(skb)->frags[ii]; 545 546 cur_phys = skb_frag_dma_map(ndev->dev.parent, frag, 0, 547 skb_frag_size(frag), 548 DMA_TO_DEVICE); 549 if (dma_mapping_error(ndev->dev.parent, cur_phys)) 550 goto frag_err; 551 nixge_hw_dma_bd_set_phys(cur_p, cur_phys); 552 553 cur_p->cntrl = skb_frag_size(frag); 554 555 tx_skb->skb = NULL; 556 tx_skb->mapping = cur_phys; 557 tx_skb->size = skb_frag_size(frag); 558 tx_skb->mapped_as_page = true; 559 } 560 561 /* last buffer of the frame */ 562 tx_skb->skb = skb; 563 564 cur_p->cntrl |= XAXIDMA_BD_CTRL_TXEOF_MASK; 565 566 tail_p = priv->tx_bd_p + sizeof(*priv->tx_bd_v) * priv->tx_bd_tail; 567 /* Start the transfer */ 568 nixge_dma_write_desc_reg(priv, XAXIDMA_TX_TDESC_OFFSET, tail_p); 569 ++priv->tx_bd_tail; 570 priv->tx_bd_tail %= TX_BD_NUM; 571 572 return NETDEV_TX_OK; 573 frag_err: 574 for (; ii > 0; ii--) { 575 if (priv->tx_bd_tail) 576 priv->tx_bd_tail--; 577 else 578 priv->tx_bd_tail = TX_BD_NUM - 1; 579 580 tx_skb = &priv->tx_skb[priv->tx_bd_tail]; 581 nixge_tx_skb_unmap(priv, tx_skb); 582 583 cur_p = &priv->tx_bd_v[priv->tx_bd_tail]; 584 cur_p->status = 0; 585 } 586 dma_unmap_single(priv->ndev->dev.parent, 587 tx_skb->mapping, 588 tx_skb->size, DMA_TO_DEVICE); 589 drop: 590 ndev->stats.tx_dropped++; 591 return NETDEV_TX_OK; 592 } 593 594 static int nixge_recv(struct net_device *ndev, int budget) 595 { 596 struct nixge_priv *priv = netdev_priv(ndev); 597 struct sk_buff *skb, *new_skb; 598 struct nixge_hw_dma_bd *cur_p; 599 dma_addr_t tail_p = 0, cur_phys = 0; 600 u32 packets = 0; 601 u32 length = 0; 602 u32 size = 0; 603 604 cur_p = &priv->rx_bd_v[priv->rx_bd_ci]; 605 606 while ((cur_p->status & XAXIDMA_BD_STS_COMPLETE_MASK && 607 budget > packets)) { 608 tail_p = priv->rx_bd_p + sizeof(*priv->rx_bd_v) * 609 priv->rx_bd_ci; 610 611 skb = (struct sk_buff *)(uintptr_t) 612 nixge_hw_dma_bd_get_addr(cur_p, sw_id_offset); 613 614 length = cur_p->status & XAXIDMA_BD_STS_ACTUAL_LEN_MASK; 615 if (length > NIXGE_MAX_JUMBO_FRAME_SIZE) 616 length = NIXGE_MAX_JUMBO_FRAME_SIZE; 617 618 dma_unmap_single(ndev->dev.parent, 619 nixge_hw_dma_bd_get_addr(cur_p, phys), 620 NIXGE_MAX_JUMBO_FRAME_SIZE, 621 DMA_FROM_DEVICE); 622 623 skb_put(skb, length); 624 625 skb->protocol = eth_type_trans(skb, ndev); 626 skb_checksum_none_assert(skb); 627 628 /* For now mark them as CHECKSUM_NONE since 629 * we don't have offload capabilities 630 */ 631 skb->ip_summed = CHECKSUM_NONE; 632 633 napi_gro_receive(&priv->napi, skb); 634 635 size += length; 636 packets++; 637 638 new_skb = netdev_alloc_skb_ip_align(ndev, 639 NIXGE_MAX_JUMBO_FRAME_SIZE); 640 if (!new_skb) 641 return packets; 642 643 cur_phys = dma_map_single(ndev->dev.parent, new_skb->data, 644 NIXGE_MAX_JUMBO_FRAME_SIZE, 645 DMA_FROM_DEVICE); 646 if (dma_mapping_error(ndev->dev.parent, cur_phys)) { 647 /* FIXME: bail out and clean up */ 648 netdev_err(ndev, "Failed to map ...\n"); 649 } 650 nixge_hw_dma_bd_set_phys(cur_p, cur_phys); 651 cur_p->cntrl = NIXGE_MAX_JUMBO_FRAME_SIZE; 652 cur_p->status = 0; 653 nixge_hw_dma_bd_set_offset(cur_p, (uintptr_t)new_skb); 654 655 ++priv->rx_bd_ci; 656 priv->rx_bd_ci %= RX_BD_NUM; 657 cur_p = &priv->rx_bd_v[priv->rx_bd_ci]; 658 } 659 660 ndev->stats.rx_packets += packets; 661 ndev->stats.rx_bytes += size; 662 663 if (tail_p) 664 nixge_dma_write_desc_reg(priv, XAXIDMA_RX_TDESC_OFFSET, tail_p); 665 666 return packets; 667 } 668 669 static int nixge_poll(struct napi_struct *napi, int budget) 670 { 671 struct nixge_priv *priv = container_of(napi, struct nixge_priv, napi); 672 int work_done; 673 u32 status, cr; 674 675 work_done = 0; 676 677 work_done = nixge_recv(priv->ndev, budget); 678 if (work_done < budget) { 679 napi_complete_done(napi, work_done); 680 status = nixge_dma_read_reg(priv, XAXIDMA_RX_SR_OFFSET); 681 682 if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) { 683 /* If there's more, reschedule, but clear */ 684 nixge_dma_write_reg(priv, XAXIDMA_RX_SR_OFFSET, status); 685 napi_reschedule(napi); 686 } else { 687 /* if not, turn on RX IRQs again ... */ 688 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET); 689 cr |= (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK); 690 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr); 691 } 692 } 693 694 return work_done; 695 } 696 697 static irqreturn_t nixge_tx_irq(int irq, void *_ndev) 698 { 699 struct nixge_priv *priv = netdev_priv(_ndev); 700 struct net_device *ndev = _ndev; 701 unsigned int status; 702 dma_addr_t phys; 703 u32 cr; 704 705 status = nixge_dma_read_reg(priv, XAXIDMA_TX_SR_OFFSET); 706 if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) { 707 nixge_dma_write_reg(priv, XAXIDMA_TX_SR_OFFSET, status); 708 nixge_start_xmit_done(priv->ndev); 709 goto out; 710 } 711 if (!(status & XAXIDMA_IRQ_ALL_MASK)) { 712 netdev_err(ndev, "No interrupts asserted in Tx path\n"); 713 return IRQ_NONE; 714 } 715 if (status & XAXIDMA_IRQ_ERROR_MASK) { 716 phys = nixge_hw_dma_bd_get_addr(&priv->tx_bd_v[priv->tx_bd_ci], 717 phys); 718 719 netdev_err(ndev, "DMA Tx error 0x%x\n", status); 720 netdev_err(ndev, "Current BD is at: 0x%llx\n", (u64)phys); 721 722 cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET); 723 /* Disable coalesce, delay timer and error interrupts */ 724 cr &= (~XAXIDMA_IRQ_ALL_MASK); 725 /* Write to the Tx channel control register */ 726 nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, cr); 727 728 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET); 729 /* Disable coalesce, delay timer and error interrupts */ 730 cr &= (~XAXIDMA_IRQ_ALL_MASK); 731 /* Write to the Rx channel control register */ 732 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr); 733 734 tasklet_schedule(&priv->dma_err_tasklet); 735 nixge_dma_write_reg(priv, XAXIDMA_TX_SR_OFFSET, status); 736 } 737 out: 738 return IRQ_HANDLED; 739 } 740 741 static irqreturn_t nixge_rx_irq(int irq, void *_ndev) 742 { 743 struct nixge_priv *priv = netdev_priv(_ndev); 744 struct net_device *ndev = _ndev; 745 unsigned int status; 746 dma_addr_t phys; 747 u32 cr; 748 749 status = nixge_dma_read_reg(priv, XAXIDMA_RX_SR_OFFSET); 750 if (status & (XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK)) { 751 /* Turn of IRQs because NAPI */ 752 nixge_dma_write_reg(priv, XAXIDMA_RX_SR_OFFSET, status); 753 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET); 754 cr &= ~(XAXIDMA_IRQ_IOC_MASK | XAXIDMA_IRQ_DELAY_MASK); 755 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr); 756 757 if (napi_schedule_prep(&priv->napi)) 758 __napi_schedule(&priv->napi); 759 goto out; 760 } 761 if (!(status & XAXIDMA_IRQ_ALL_MASK)) { 762 netdev_err(ndev, "No interrupts asserted in Rx path\n"); 763 return IRQ_NONE; 764 } 765 if (status & XAXIDMA_IRQ_ERROR_MASK) { 766 phys = nixge_hw_dma_bd_get_addr(&priv->rx_bd_v[priv->rx_bd_ci], 767 phys); 768 netdev_err(ndev, "DMA Rx error 0x%x\n", status); 769 netdev_err(ndev, "Current BD is at: 0x%llx\n", (u64)phys); 770 771 cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET); 772 /* Disable coalesce, delay timer and error interrupts */ 773 cr &= (~XAXIDMA_IRQ_ALL_MASK); 774 /* Finally write to the Tx channel control register */ 775 nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, cr); 776 777 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET); 778 /* Disable coalesce, delay timer and error interrupts */ 779 cr &= (~XAXIDMA_IRQ_ALL_MASK); 780 /* write to the Rx channel control register */ 781 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, cr); 782 783 tasklet_schedule(&priv->dma_err_tasklet); 784 nixge_dma_write_reg(priv, XAXIDMA_RX_SR_OFFSET, status); 785 } 786 out: 787 return IRQ_HANDLED; 788 } 789 790 static void nixge_dma_err_handler(struct tasklet_struct *t) 791 { 792 struct nixge_priv *lp = from_tasklet(lp, t, dma_err_tasklet); 793 struct nixge_hw_dma_bd *cur_p; 794 struct nixge_tx_skb *tx_skb; 795 u32 cr, i; 796 797 __nixge_device_reset(lp, XAXIDMA_TX_CR_OFFSET); 798 __nixge_device_reset(lp, XAXIDMA_RX_CR_OFFSET); 799 800 for (i = 0; i < TX_BD_NUM; i++) { 801 cur_p = &lp->tx_bd_v[i]; 802 tx_skb = &lp->tx_skb[i]; 803 nixge_tx_skb_unmap(lp, tx_skb); 804 805 nixge_hw_dma_bd_set_phys(cur_p, 0); 806 cur_p->cntrl = 0; 807 cur_p->status = 0; 808 nixge_hw_dma_bd_set_offset(cur_p, 0); 809 } 810 811 for (i = 0; i < RX_BD_NUM; i++) { 812 cur_p = &lp->rx_bd_v[i]; 813 cur_p->status = 0; 814 } 815 816 lp->tx_bd_ci = 0; 817 lp->tx_bd_tail = 0; 818 lp->rx_bd_ci = 0; 819 820 /* Start updating the Rx channel control register */ 821 cr = nixge_dma_read_reg(lp, XAXIDMA_RX_CR_OFFSET); 822 /* Update the interrupt coalesce count */ 823 cr = ((cr & ~XAXIDMA_COALESCE_MASK) | 824 (XAXIDMA_DFT_RX_THRESHOLD << XAXIDMA_COALESCE_SHIFT)); 825 /* Update the delay timer count */ 826 cr = ((cr & ~XAXIDMA_DELAY_MASK) | 827 (XAXIDMA_DFT_RX_WAITBOUND << XAXIDMA_DELAY_SHIFT)); 828 /* Enable coalesce, delay timer and error interrupts */ 829 cr |= XAXIDMA_IRQ_ALL_MASK; 830 /* Finally write to the Rx channel control register */ 831 nixge_dma_write_reg(lp, XAXIDMA_RX_CR_OFFSET, cr); 832 833 /* Start updating the Tx channel control register */ 834 cr = nixge_dma_read_reg(lp, XAXIDMA_TX_CR_OFFSET); 835 /* Update the interrupt coalesce count */ 836 cr = (((cr & ~XAXIDMA_COALESCE_MASK)) | 837 (XAXIDMA_DFT_TX_THRESHOLD << XAXIDMA_COALESCE_SHIFT)); 838 /* Update the delay timer count */ 839 cr = (((cr & ~XAXIDMA_DELAY_MASK)) | 840 (XAXIDMA_DFT_TX_WAITBOUND << XAXIDMA_DELAY_SHIFT)); 841 /* Enable coalesce, delay timer and error interrupts */ 842 cr |= XAXIDMA_IRQ_ALL_MASK; 843 /* Finally write to the Tx channel control register */ 844 nixge_dma_write_reg(lp, XAXIDMA_TX_CR_OFFSET, cr); 845 846 /* Populate the tail pointer and bring the Rx Axi DMA engine out of 847 * halted state. This will make the Rx side ready for reception. 848 */ 849 nixge_dma_write_desc_reg(lp, XAXIDMA_RX_CDESC_OFFSET, lp->rx_bd_p); 850 cr = nixge_dma_read_reg(lp, XAXIDMA_RX_CR_OFFSET); 851 nixge_dma_write_reg(lp, XAXIDMA_RX_CR_OFFSET, 852 cr | XAXIDMA_CR_RUNSTOP_MASK); 853 nixge_dma_write_desc_reg(lp, XAXIDMA_RX_TDESC_OFFSET, lp->rx_bd_p + 854 (sizeof(*lp->rx_bd_v) * (RX_BD_NUM - 1))); 855 856 /* Write to the RS (Run-stop) bit in the Tx channel control register. 857 * Tx channel is now ready to run. But only after we write to the 858 * tail pointer register that the Tx channel will start transmitting 859 */ 860 nixge_dma_write_desc_reg(lp, XAXIDMA_TX_CDESC_OFFSET, lp->tx_bd_p); 861 cr = nixge_dma_read_reg(lp, XAXIDMA_TX_CR_OFFSET); 862 nixge_dma_write_reg(lp, XAXIDMA_TX_CR_OFFSET, 863 cr | XAXIDMA_CR_RUNSTOP_MASK); 864 } 865 866 static int nixge_open(struct net_device *ndev) 867 { 868 struct nixge_priv *priv = netdev_priv(ndev); 869 struct phy_device *phy; 870 int ret; 871 872 nixge_device_reset(ndev); 873 874 phy = of_phy_connect(ndev, priv->phy_node, 875 &nixge_handle_link_change, 0, priv->phy_mode); 876 if (!phy) 877 return -ENODEV; 878 879 phy_start(phy); 880 881 /* Enable tasklets for Axi DMA error handling */ 882 tasklet_setup(&priv->dma_err_tasklet, nixge_dma_err_handler); 883 884 napi_enable(&priv->napi); 885 886 /* Enable interrupts for Axi DMA Tx */ 887 ret = request_irq(priv->tx_irq, nixge_tx_irq, 0, ndev->name, ndev); 888 if (ret) 889 goto err_tx_irq; 890 /* Enable interrupts for Axi DMA Rx */ 891 ret = request_irq(priv->rx_irq, nixge_rx_irq, 0, ndev->name, ndev); 892 if (ret) 893 goto err_rx_irq; 894 895 netif_start_queue(ndev); 896 897 return 0; 898 899 err_rx_irq: 900 free_irq(priv->tx_irq, ndev); 901 err_tx_irq: 902 phy_stop(phy); 903 phy_disconnect(phy); 904 tasklet_kill(&priv->dma_err_tasklet); 905 netdev_err(ndev, "request_irq() failed\n"); 906 return ret; 907 } 908 909 static int nixge_stop(struct net_device *ndev) 910 { 911 struct nixge_priv *priv = netdev_priv(ndev); 912 u32 cr; 913 914 netif_stop_queue(ndev); 915 napi_disable(&priv->napi); 916 917 if (ndev->phydev) { 918 phy_stop(ndev->phydev); 919 phy_disconnect(ndev->phydev); 920 } 921 922 cr = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET); 923 nixge_dma_write_reg(priv, XAXIDMA_RX_CR_OFFSET, 924 cr & (~XAXIDMA_CR_RUNSTOP_MASK)); 925 cr = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET); 926 nixge_dma_write_reg(priv, XAXIDMA_TX_CR_OFFSET, 927 cr & (~XAXIDMA_CR_RUNSTOP_MASK)); 928 929 tasklet_kill(&priv->dma_err_tasklet); 930 931 free_irq(priv->tx_irq, ndev); 932 free_irq(priv->rx_irq, ndev); 933 934 nixge_hw_dma_bd_release(ndev); 935 936 return 0; 937 } 938 939 static int nixge_change_mtu(struct net_device *ndev, int new_mtu) 940 { 941 if (netif_running(ndev)) 942 return -EBUSY; 943 944 if ((new_mtu + NIXGE_HDR_SIZE + NIXGE_TRL_SIZE) > 945 NIXGE_MAX_JUMBO_FRAME_SIZE) 946 return -EINVAL; 947 948 ndev->mtu = new_mtu; 949 950 return 0; 951 } 952 953 static s32 __nixge_hw_set_mac_address(struct net_device *ndev) 954 { 955 struct nixge_priv *priv = netdev_priv(ndev); 956 957 nixge_ctrl_write_reg(priv, NIXGE_REG_MAC_LSB, 958 (ndev->dev_addr[2]) << 24 | 959 (ndev->dev_addr[3] << 16) | 960 (ndev->dev_addr[4] << 8) | 961 (ndev->dev_addr[5] << 0)); 962 963 nixge_ctrl_write_reg(priv, NIXGE_REG_MAC_MSB, 964 (ndev->dev_addr[1] | (ndev->dev_addr[0] << 8))); 965 966 return 0; 967 } 968 969 static int nixge_net_set_mac_address(struct net_device *ndev, void *p) 970 { 971 int err; 972 973 err = eth_mac_addr(ndev, p); 974 if (!err) 975 __nixge_hw_set_mac_address(ndev); 976 977 return err; 978 } 979 980 static const struct net_device_ops nixge_netdev_ops = { 981 .ndo_open = nixge_open, 982 .ndo_stop = nixge_stop, 983 .ndo_start_xmit = nixge_start_xmit, 984 .ndo_change_mtu = nixge_change_mtu, 985 .ndo_set_mac_address = nixge_net_set_mac_address, 986 .ndo_validate_addr = eth_validate_addr, 987 }; 988 989 static void nixge_ethtools_get_drvinfo(struct net_device *ndev, 990 struct ethtool_drvinfo *ed) 991 { 992 strlcpy(ed->driver, "nixge", sizeof(ed->driver)); 993 strlcpy(ed->bus_info, "platform", sizeof(ed->bus_info)); 994 } 995 996 static int nixge_ethtools_get_coalesce(struct net_device *ndev, 997 struct ethtool_coalesce *ecoalesce) 998 { 999 struct nixge_priv *priv = netdev_priv(ndev); 1000 u32 regval = 0; 1001 1002 regval = nixge_dma_read_reg(priv, XAXIDMA_RX_CR_OFFSET); 1003 ecoalesce->rx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK) 1004 >> XAXIDMA_COALESCE_SHIFT; 1005 regval = nixge_dma_read_reg(priv, XAXIDMA_TX_CR_OFFSET); 1006 ecoalesce->tx_max_coalesced_frames = (regval & XAXIDMA_COALESCE_MASK) 1007 >> XAXIDMA_COALESCE_SHIFT; 1008 return 0; 1009 } 1010 1011 static int nixge_ethtools_set_coalesce(struct net_device *ndev, 1012 struct ethtool_coalesce *ecoalesce) 1013 { 1014 struct nixge_priv *priv = netdev_priv(ndev); 1015 1016 if (netif_running(ndev)) { 1017 netdev_err(ndev, 1018 "Please stop netif before applying configuration\n"); 1019 return -EBUSY; 1020 } 1021 1022 if (ecoalesce->rx_max_coalesced_frames) 1023 priv->coalesce_count_rx = ecoalesce->rx_max_coalesced_frames; 1024 if (ecoalesce->tx_max_coalesced_frames) 1025 priv->coalesce_count_tx = ecoalesce->tx_max_coalesced_frames; 1026 1027 return 0; 1028 } 1029 1030 static int nixge_ethtools_set_phys_id(struct net_device *ndev, 1031 enum ethtool_phys_id_state state) 1032 { 1033 struct nixge_priv *priv = netdev_priv(ndev); 1034 u32 ctrl; 1035 1036 ctrl = nixge_ctrl_read_reg(priv, NIXGE_REG_LED_CTL); 1037 switch (state) { 1038 case ETHTOOL_ID_ACTIVE: 1039 ctrl |= NIXGE_ID_LED_CTL_EN; 1040 /* Enable identification LED override*/ 1041 nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl); 1042 return 2; 1043 1044 case ETHTOOL_ID_ON: 1045 ctrl |= NIXGE_ID_LED_CTL_VAL; 1046 nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl); 1047 break; 1048 1049 case ETHTOOL_ID_OFF: 1050 ctrl &= ~NIXGE_ID_LED_CTL_VAL; 1051 nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl); 1052 break; 1053 1054 case ETHTOOL_ID_INACTIVE: 1055 /* Restore LED settings */ 1056 ctrl &= ~NIXGE_ID_LED_CTL_EN; 1057 nixge_ctrl_write_reg(priv, NIXGE_REG_LED_CTL, ctrl); 1058 break; 1059 } 1060 1061 return 0; 1062 } 1063 1064 static const struct ethtool_ops nixge_ethtool_ops = { 1065 .supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES, 1066 .get_drvinfo = nixge_ethtools_get_drvinfo, 1067 .get_coalesce = nixge_ethtools_get_coalesce, 1068 .set_coalesce = nixge_ethtools_set_coalesce, 1069 .set_phys_id = nixge_ethtools_set_phys_id, 1070 .get_link_ksettings = phy_ethtool_get_link_ksettings, 1071 .set_link_ksettings = phy_ethtool_set_link_ksettings, 1072 .get_link = ethtool_op_get_link, 1073 }; 1074 1075 static int nixge_mdio_read(struct mii_bus *bus, int phy_id, int reg) 1076 { 1077 struct nixge_priv *priv = bus->priv; 1078 u32 status, tmp; 1079 int err; 1080 u16 device; 1081 1082 if (reg & MII_ADDR_C45) { 1083 device = (reg >> 16) & 0x1f; 1084 1085 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff); 1086 1087 tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS) 1088 | NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device); 1089 1090 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp); 1091 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1); 1092 1093 err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status, 1094 !status, 10, 1000); 1095 if (err) { 1096 dev_err(priv->dev, "timeout setting address"); 1097 return err; 1098 } 1099 1100 tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_C45_READ) | 1101 NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device); 1102 } else { 1103 device = reg & 0x1f; 1104 1105 tmp = NIXGE_MDIO_CLAUSE22 | NIXGE_MDIO_OP(NIXGE_MDIO_C22_READ) | 1106 NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device); 1107 } 1108 1109 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp); 1110 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1); 1111 1112 err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status, 1113 !status, 10, 1000); 1114 if (err) { 1115 dev_err(priv->dev, "timeout setting read command"); 1116 return err; 1117 } 1118 1119 status = nixge_ctrl_read_reg(priv, NIXGE_REG_MDIO_DATA); 1120 1121 return status; 1122 } 1123 1124 static int nixge_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val) 1125 { 1126 struct nixge_priv *priv = bus->priv; 1127 u32 status, tmp; 1128 u16 device; 1129 int err; 1130 1131 if (reg & MII_ADDR_C45) { 1132 device = (reg >> 16) & 0x1f; 1133 1134 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_ADDR, reg & 0xffff); 1135 1136 tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_OP_ADDRESS) 1137 | NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device); 1138 1139 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp); 1140 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1); 1141 1142 err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status, 1143 !status, 10, 1000); 1144 if (err) { 1145 dev_err(priv->dev, "timeout setting address"); 1146 return err; 1147 } 1148 1149 tmp = NIXGE_MDIO_CLAUSE45 | NIXGE_MDIO_OP(NIXGE_MDIO_C45_WRITE) 1150 | NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device); 1151 1152 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_DATA, val); 1153 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp); 1154 err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status, 1155 !status, 10, 1000); 1156 if (err) 1157 dev_err(priv->dev, "timeout setting write command"); 1158 } else { 1159 device = reg & 0x1f; 1160 1161 tmp = NIXGE_MDIO_CLAUSE22 | 1162 NIXGE_MDIO_OP(NIXGE_MDIO_C22_WRITE) | 1163 NIXGE_MDIO_ADDR(phy_id) | NIXGE_MDIO_MMD(device); 1164 1165 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_DATA, val); 1166 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_OP, tmp); 1167 nixge_ctrl_write_reg(priv, NIXGE_REG_MDIO_CTRL, 1); 1168 1169 err = nixge_ctrl_poll_timeout(priv, NIXGE_REG_MDIO_CTRL, status, 1170 !status, 10, 1000); 1171 if (err) 1172 dev_err(priv->dev, "timeout setting write command"); 1173 } 1174 1175 return err; 1176 } 1177 1178 static int nixge_mdio_setup(struct nixge_priv *priv, struct device_node *np) 1179 { 1180 struct mii_bus *bus; 1181 1182 bus = devm_mdiobus_alloc(priv->dev); 1183 if (!bus) 1184 return -ENOMEM; 1185 1186 snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(priv->dev)); 1187 bus->priv = priv; 1188 bus->name = "nixge_mii_bus"; 1189 bus->read = nixge_mdio_read; 1190 bus->write = nixge_mdio_write; 1191 bus->parent = priv->dev; 1192 1193 priv->mii_bus = bus; 1194 1195 return of_mdiobus_register(bus, np); 1196 } 1197 1198 static void *nixge_get_nvmem_address(struct device *dev) 1199 { 1200 struct nvmem_cell *cell; 1201 size_t cell_size; 1202 char *mac; 1203 1204 cell = nvmem_cell_get(dev, "address"); 1205 if (IS_ERR(cell)) 1206 return NULL; 1207 1208 mac = nvmem_cell_read(cell, &cell_size); 1209 nvmem_cell_put(cell); 1210 1211 return mac; 1212 } 1213 1214 /* Match table for of_platform binding */ 1215 static const struct of_device_id nixge_dt_ids[] = { 1216 { .compatible = "ni,xge-enet-2.00", .data = (void *)NIXGE_V2 }, 1217 { .compatible = "ni,xge-enet-3.00", .data = (void *)NIXGE_V3 }, 1218 {}, 1219 }; 1220 MODULE_DEVICE_TABLE(of, nixge_dt_ids); 1221 1222 static int nixge_of_get_resources(struct platform_device *pdev) 1223 { 1224 const struct of_device_id *of_id; 1225 enum nixge_version version; 1226 struct resource *ctrlres; 1227 struct resource *dmares; 1228 struct net_device *ndev; 1229 struct nixge_priv *priv; 1230 1231 ndev = platform_get_drvdata(pdev); 1232 priv = netdev_priv(ndev); 1233 of_id = of_match_node(nixge_dt_ids, pdev->dev.of_node); 1234 if (!of_id) 1235 return -ENODEV; 1236 1237 version = (enum nixge_version)of_id->data; 1238 if (version <= NIXGE_V2) 1239 dmares = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1240 else 1241 dmares = platform_get_resource_byname(pdev, IORESOURCE_MEM, 1242 "dma"); 1243 1244 priv->dma_regs = devm_ioremap_resource(&pdev->dev, dmares); 1245 if (IS_ERR(priv->dma_regs)) { 1246 netdev_err(ndev, "failed to map dma regs\n"); 1247 return PTR_ERR(priv->dma_regs); 1248 } 1249 if (version <= NIXGE_V2) { 1250 priv->ctrl_regs = priv->dma_regs + NIXGE_REG_CTRL_OFFSET; 1251 } else { 1252 ctrlres = platform_get_resource_byname(pdev, IORESOURCE_MEM, 1253 "ctrl"); 1254 priv->ctrl_regs = devm_ioremap_resource(&pdev->dev, ctrlres); 1255 } 1256 if (IS_ERR(priv->ctrl_regs)) { 1257 netdev_err(ndev, "failed to map ctrl regs\n"); 1258 return PTR_ERR(priv->ctrl_regs); 1259 } 1260 return 0; 1261 } 1262 1263 static int nixge_probe(struct platform_device *pdev) 1264 { 1265 struct device_node *mn, *phy_node; 1266 struct nixge_priv *priv; 1267 struct net_device *ndev; 1268 const u8 *mac_addr; 1269 int err; 1270 1271 ndev = alloc_etherdev(sizeof(*priv)); 1272 if (!ndev) 1273 return -ENOMEM; 1274 1275 platform_set_drvdata(pdev, ndev); 1276 SET_NETDEV_DEV(ndev, &pdev->dev); 1277 1278 ndev->features = NETIF_F_SG; 1279 ndev->netdev_ops = &nixge_netdev_ops; 1280 ndev->ethtool_ops = &nixge_ethtool_ops; 1281 1282 /* MTU range: 64 - 9000 */ 1283 ndev->min_mtu = 64; 1284 ndev->max_mtu = NIXGE_JUMBO_MTU; 1285 1286 mac_addr = nixge_get_nvmem_address(&pdev->dev); 1287 if (mac_addr && is_valid_ether_addr(mac_addr)) { 1288 ether_addr_copy(ndev->dev_addr, mac_addr); 1289 kfree(mac_addr); 1290 } else { 1291 eth_hw_addr_random(ndev); 1292 } 1293 1294 priv = netdev_priv(ndev); 1295 priv->ndev = ndev; 1296 priv->dev = &pdev->dev; 1297 1298 netif_napi_add(ndev, &priv->napi, nixge_poll, NAPI_POLL_WEIGHT); 1299 err = nixge_of_get_resources(pdev); 1300 if (err) 1301 goto free_netdev; 1302 __nixge_hw_set_mac_address(ndev); 1303 1304 priv->tx_irq = platform_get_irq_byname(pdev, "tx"); 1305 if (priv->tx_irq < 0) { 1306 netdev_err(ndev, "could not find 'tx' irq"); 1307 err = priv->tx_irq; 1308 goto free_netdev; 1309 } 1310 1311 priv->rx_irq = platform_get_irq_byname(pdev, "rx"); 1312 if (priv->rx_irq < 0) { 1313 netdev_err(ndev, "could not find 'rx' irq"); 1314 err = priv->rx_irq; 1315 goto free_netdev; 1316 } 1317 1318 priv->coalesce_count_rx = XAXIDMA_DFT_RX_THRESHOLD; 1319 priv->coalesce_count_tx = XAXIDMA_DFT_TX_THRESHOLD; 1320 1321 mn = of_get_child_by_name(pdev->dev.of_node, "mdio"); 1322 if (mn) { 1323 err = nixge_mdio_setup(priv, mn); 1324 of_node_put(mn); 1325 if (err) { 1326 netdev_err(ndev, "error registering mdio bus"); 1327 goto free_netdev; 1328 } 1329 } 1330 1331 err = of_get_phy_mode(pdev->dev.of_node, &priv->phy_mode); 1332 if (err) { 1333 netdev_err(ndev, "not find \"phy-mode\" property\n"); 1334 goto unregister_mdio; 1335 } 1336 1337 phy_node = of_parse_phandle(pdev->dev.of_node, "phy-handle", 0); 1338 if (!phy_node && of_phy_is_fixed_link(pdev->dev.of_node)) { 1339 err = of_phy_register_fixed_link(pdev->dev.of_node); 1340 if (err < 0) { 1341 netdev_err(ndev, "broken fixed-link specification\n"); 1342 goto unregister_mdio; 1343 } 1344 phy_node = of_node_get(pdev->dev.of_node); 1345 } 1346 priv->phy_node = phy_node; 1347 1348 err = register_netdev(priv->ndev); 1349 if (err) { 1350 netdev_err(ndev, "register_netdev() error (%i)\n", err); 1351 goto free_phy; 1352 } 1353 1354 return 0; 1355 1356 free_phy: 1357 if (of_phy_is_fixed_link(pdev->dev.of_node)) 1358 of_phy_deregister_fixed_link(pdev->dev.of_node); 1359 of_node_put(phy_node); 1360 1361 unregister_mdio: 1362 if (priv->mii_bus) 1363 mdiobus_unregister(priv->mii_bus); 1364 1365 free_netdev: 1366 free_netdev(ndev); 1367 1368 return err; 1369 } 1370 1371 static int nixge_remove(struct platform_device *pdev) 1372 { 1373 struct net_device *ndev = platform_get_drvdata(pdev); 1374 struct nixge_priv *priv = netdev_priv(ndev); 1375 1376 unregister_netdev(ndev); 1377 1378 if (of_phy_is_fixed_link(pdev->dev.of_node)) 1379 of_phy_deregister_fixed_link(pdev->dev.of_node); 1380 of_node_put(priv->phy_node); 1381 1382 if (priv->mii_bus) 1383 mdiobus_unregister(priv->mii_bus); 1384 1385 free_netdev(ndev); 1386 1387 return 0; 1388 } 1389 1390 static struct platform_driver nixge_driver = { 1391 .probe = nixge_probe, 1392 .remove = nixge_remove, 1393 .driver = { 1394 .name = "nixge", 1395 .of_match_table = of_match_ptr(nixge_dt_ids), 1396 }, 1397 }; 1398 module_platform_driver(nixge_driver); 1399 1400 MODULE_LICENSE("GPL v2"); 1401 MODULE_DESCRIPTION("National Instruments XGE Management MAC"); 1402 MODULE_AUTHOR("Moritz Fischer <mdf@kernel.org>"); 1403