1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 10G controller driver for Samsung SoCs 3 * 4 * Copyright (C) 2013 Samsung Electronics Co., Ltd. 5 * http://www.samsung.com 6 * 7 * Author: Siva Reddy Kallam <siva.kallam@samsung.com> 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/clk.h> 13 #include <linux/crc32.h> 14 #include <linux/dma-mapping.h> 15 #include <linux/etherdevice.h> 16 #include <linux/ethtool.h> 17 #include <linux/if.h> 18 #include <linux/if_ether.h> 19 #include <linux/if_vlan.h> 20 #include <linux/init.h> 21 #include <linux/interrupt.h> 22 #include <linux/ip.h> 23 #include <linux/kernel.h> 24 #include <linux/mii.h> 25 #include <linux/module.h> 26 #include <linux/net_tstamp.h> 27 #include <linux/netdevice.h> 28 #include <linux/phy.h> 29 #include <linux/platform_device.h> 30 #include <linux/prefetch.h> 31 #include <linux/skbuff.h> 32 #include <linux/slab.h> 33 #include <linux/tcp.h> 34 #include <linux/sxgbe_platform.h> 35 36 #include "sxgbe_common.h" 37 #include "sxgbe_desc.h" 38 #include "sxgbe_dma.h" 39 #include "sxgbe_mtl.h" 40 #include "sxgbe_reg.h" 41 42 #define SXGBE_ALIGN(x) L1_CACHE_ALIGN(x) 43 #define JUMBO_LEN 9000 44 45 /* Module parameters */ 46 #define TX_TIMEO 5000 47 #define DMA_TX_SIZE 512 48 #define DMA_RX_SIZE 1024 49 #define TC_DEFAULT 64 50 #define DMA_BUFFER_SIZE BUF_SIZE_2KiB 51 /* The default timer value as per the sxgbe specification 1 sec(1000 ms) */ 52 #define SXGBE_DEFAULT_LPI_TIMER 1000 53 54 static int debug = -1; 55 static int eee_timer = SXGBE_DEFAULT_LPI_TIMER; 56 57 module_param(eee_timer, int, 0644); 58 59 module_param(debug, int, 0644); 60 static const u32 default_msg_level = (NETIF_MSG_DRV | NETIF_MSG_PROBE | 61 NETIF_MSG_LINK | NETIF_MSG_IFUP | 62 NETIF_MSG_IFDOWN | NETIF_MSG_TIMER); 63 64 static irqreturn_t sxgbe_common_interrupt(int irq, void *dev_id); 65 static irqreturn_t sxgbe_tx_interrupt(int irq, void *dev_id); 66 static irqreturn_t sxgbe_rx_interrupt(int irq, void *dev_id); 67 68 #define SXGBE_COAL_TIMER(x) (jiffies + usecs_to_jiffies(x)) 69 70 #define SXGBE_LPI_TIMER(x) (jiffies + msecs_to_jiffies(x)) 71 72 /** 73 * sxgbe_verify_args - verify the driver parameters. 74 * Description: it verifies if some wrong parameter is passed to the driver. 75 * Note that wrong parameters are replaced with the default values. 76 */ 77 static void sxgbe_verify_args(void) 78 { 79 if (unlikely(eee_timer < 0)) 80 eee_timer = SXGBE_DEFAULT_LPI_TIMER; 81 } 82 83 static void sxgbe_enable_eee_mode(const struct sxgbe_priv_data *priv) 84 { 85 /* Check and enter in LPI mode */ 86 if (!priv->tx_path_in_lpi_mode) 87 priv->hw->mac->set_eee_mode(priv->ioaddr); 88 } 89 90 void sxgbe_disable_eee_mode(struct sxgbe_priv_data * const priv) 91 { 92 /* Exit and disable EEE in case of we are are in LPI state. */ 93 priv->hw->mac->reset_eee_mode(priv->ioaddr); 94 del_timer_sync(&priv->eee_ctrl_timer); 95 priv->tx_path_in_lpi_mode = false; 96 } 97 98 /** 99 * sxgbe_eee_ctrl_timer 100 * @arg : data hook 101 * Description: 102 * If there is no data transfer and if we are not in LPI state, 103 * then MAC Transmitter can be moved to LPI state. 104 */ 105 static void sxgbe_eee_ctrl_timer(struct timer_list *t) 106 { 107 struct sxgbe_priv_data *priv = from_timer(priv, t, eee_ctrl_timer); 108 109 sxgbe_enable_eee_mode(priv); 110 mod_timer(&priv->eee_ctrl_timer, SXGBE_LPI_TIMER(eee_timer)); 111 } 112 113 /** 114 * sxgbe_eee_init 115 * @priv: private device pointer 116 * Description: 117 * If the EEE support has been enabled while configuring the driver, 118 * if the GMAC actually supports the EEE (from the HW cap reg) and the 119 * phy can also manage EEE, so enable the LPI state and start the timer 120 * to verify if the tx path can enter in LPI state. 121 */ 122 bool sxgbe_eee_init(struct sxgbe_priv_data * const priv) 123 { 124 struct net_device *ndev = priv->dev; 125 bool ret = false; 126 127 /* MAC core supports the EEE feature. */ 128 if (priv->hw_cap.eee) { 129 /* Check if the PHY supports EEE */ 130 if (phy_init_eee(ndev->phydev, 1)) 131 return false; 132 133 priv->eee_active = 1; 134 timer_setup(&priv->eee_ctrl_timer, sxgbe_eee_ctrl_timer, 0); 135 priv->eee_ctrl_timer.expires = SXGBE_LPI_TIMER(eee_timer); 136 add_timer(&priv->eee_ctrl_timer); 137 138 priv->hw->mac->set_eee_timer(priv->ioaddr, 139 SXGBE_DEFAULT_LPI_TIMER, 140 priv->tx_lpi_timer); 141 142 pr_info("Energy-Efficient Ethernet initialized\n"); 143 144 ret = true; 145 } 146 147 return ret; 148 } 149 150 static void sxgbe_eee_adjust(const struct sxgbe_priv_data *priv) 151 { 152 struct net_device *ndev = priv->dev; 153 154 /* When the EEE has been already initialised we have to 155 * modify the PLS bit in the LPI ctrl & status reg according 156 * to the PHY link status. For this reason. 157 */ 158 if (priv->eee_enabled) 159 priv->hw->mac->set_eee_pls(priv->ioaddr, ndev->phydev->link); 160 } 161 162 /** 163 * sxgbe_clk_csr_set - dynamically set the MDC clock 164 * @priv: driver private structure 165 * Description: this is to dynamically set the MDC clock according to the csr 166 * clock input. 167 */ 168 static void sxgbe_clk_csr_set(struct sxgbe_priv_data *priv) 169 { 170 u32 clk_rate = clk_get_rate(priv->sxgbe_clk); 171 172 /* assign the proper divider, this will be used during 173 * mdio communication 174 */ 175 if (clk_rate < SXGBE_CSR_F_150M) 176 priv->clk_csr = SXGBE_CSR_100_150M; 177 else if (clk_rate <= SXGBE_CSR_F_250M) 178 priv->clk_csr = SXGBE_CSR_150_250M; 179 else if (clk_rate <= SXGBE_CSR_F_300M) 180 priv->clk_csr = SXGBE_CSR_250_300M; 181 else if (clk_rate <= SXGBE_CSR_F_350M) 182 priv->clk_csr = SXGBE_CSR_300_350M; 183 else if (clk_rate <= SXGBE_CSR_F_400M) 184 priv->clk_csr = SXGBE_CSR_350_400M; 185 else if (clk_rate <= SXGBE_CSR_F_500M) 186 priv->clk_csr = SXGBE_CSR_400_500M; 187 } 188 189 /* minimum number of free TX descriptors required to wake up TX process */ 190 #define SXGBE_TX_THRESH(x) (x->dma_tx_size/4) 191 192 static inline u32 sxgbe_tx_avail(struct sxgbe_tx_queue *queue, int tx_qsize) 193 { 194 return queue->dirty_tx + tx_qsize - queue->cur_tx - 1; 195 } 196 197 /** 198 * sxgbe_adjust_link 199 * @dev: net device structure 200 * Description: it adjusts the link parameters. 201 */ 202 static void sxgbe_adjust_link(struct net_device *dev) 203 { 204 struct sxgbe_priv_data *priv = netdev_priv(dev); 205 struct phy_device *phydev = dev->phydev; 206 u8 new_state = 0; 207 u8 speed = 0xff; 208 209 if (!phydev) 210 return; 211 212 /* SXGBE is not supporting auto-negotiation and 213 * half duplex mode. so, not handling duplex change 214 * in this function. only handling speed and link status 215 */ 216 if (phydev->link) { 217 if (phydev->speed != priv->speed) { 218 new_state = 1; 219 switch (phydev->speed) { 220 case SPEED_10000: 221 speed = SXGBE_SPEED_10G; 222 break; 223 case SPEED_2500: 224 speed = SXGBE_SPEED_2_5G; 225 break; 226 case SPEED_1000: 227 speed = SXGBE_SPEED_1G; 228 break; 229 default: 230 netif_err(priv, link, dev, 231 "Speed (%d) not supported\n", 232 phydev->speed); 233 } 234 235 priv->speed = phydev->speed; 236 priv->hw->mac->set_speed(priv->ioaddr, speed); 237 } 238 239 if (!priv->oldlink) { 240 new_state = 1; 241 priv->oldlink = 1; 242 } 243 } else if (priv->oldlink) { 244 new_state = 1; 245 priv->oldlink = 0; 246 priv->speed = SPEED_UNKNOWN; 247 } 248 249 if (new_state & netif_msg_link(priv)) 250 phy_print_status(phydev); 251 252 /* Alter the MAC settings for EEE */ 253 sxgbe_eee_adjust(priv); 254 } 255 256 /** 257 * sxgbe_init_phy - PHY initialization 258 * @dev: net device structure 259 * Description: it initializes the driver's PHY state, and attaches the PHY 260 * to the mac driver. 261 * Return value: 262 * 0 on success 263 */ 264 static int sxgbe_init_phy(struct net_device *ndev) 265 { 266 char phy_id_fmt[MII_BUS_ID_SIZE + 3]; 267 char bus_id[MII_BUS_ID_SIZE]; 268 struct phy_device *phydev; 269 struct sxgbe_priv_data *priv = netdev_priv(ndev); 270 int phy_iface = priv->plat->interface; 271 272 /* assign default link status */ 273 priv->oldlink = 0; 274 priv->speed = SPEED_UNKNOWN; 275 priv->oldduplex = DUPLEX_UNKNOWN; 276 277 if (priv->plat->phy_bus_name) 278 snprintf(bus_id, MII_BUS_ID_SIZE, "%s-%x", 279 priv->plat->phy_bus_name, priv->plat->bus_id); 280 else 281 snprintf(bus_id, MII_BUS_ID_SIZE, "sxgbe-%x", 282 priv->plat->bus_id); 283 284 snprintf(phy_id_fmt, MII_BUS_ID_SIZE + 3, PHY_ID_FMT, bus_id, 285 priv->plat->phy_addr); 286 netdev_dbg(ndev, "%s: trying to attach to %s\n", __func__, phy_id_fmt); 287 288 phydev = phy_connect(ndev, phy_id_fmt, &sxgbe_adjust_link, phy_iface); 289 290 if (IS_ERR(phydev)) { 291 netdev_err(ndev, "Could not attach to PHY\n"); 292 return PTR_ERR(phydev); 293 } 294 295 /* Stop Advertising 1000BASE Capability if interface is not GMII */ 296 if ((phy_iface == PHY_INTERFACE_MODE_MII) || 297 (phy_iface == PHY_INTERFACE_MODE_RMII)) 298 phy_set_max_speed(phydev, SPEED_1000); 299 300 if (phydev->phy_id == 0) { 301 phy_disconnect(phydev); 302 return -ENODEV; 303 } 304 305 netdev_dbg(ndev, "%s: attached to PHY (UID 0x%x) Link = %d\n", 306 __func__, phydev->phy_id, phydev->link); 307 308 return 0; 309 } 310 311 /** 312 * sxgbe_clear_descriptors: clear descriptors 313 * @priv: driver private structure 314 * Description: this function is called to clear the tx and rx descriptors 315 * in case of both basic and extended descriptors are used. 316 */ 317 static void sxgbe_clear_descriptors(struct sxgbe_priv_data *priv) 318 { 319 int i, j; 320 unsigned int txsize = priv->dma_tx_size; 321 unsigned int rxsize = priv->dma_rx_size; 322 323 /* Clear the Rx/Tx descriptors */ 324 for (j = 0; j < SXGBE_RX_QUEUES; j++) { 325 for (i = 0; i < rxsize; i++) 326 priv->hw->desc->init_rx_desc(&priv->rxq[j]->dma_rx[i], 327 priv->use_riwt, priv->mode, 328 (i == rxsize - 1)); 329 } 330 331 for (j = 0; j < SXGBE_TX_QUEUES; j++) { 332 for (i = 0; i < txsize; i++) 333 priv->hw->desc->init_tx_desc(&priv->txq[j]->dma_tx[i]); 334 } 335 } 336 337 static int sxgbe_init_rx_buffers(struct net_device *dev, 338 struct sxgbe_rx_norm_desc *p, int i, 339 unsigned int dma_buf_sz, 340 struct sxgbe_rx_queue *rx_ring) 341 { 342 struct sxgbe_priv_data *priv = netdev_priv(dev); 343 struct sk_buff *skb; 344 345 skb = __netdev_alloc_skb_ip_align(dev, dma_buf_sz, GFP_KERNEL); 346 if (!skb) 347 return -ENOMEM; 348 349 rx_ring->rx_skbuff[i] = skb; 350 rx_ring->rx_skbuff_dma[i] = dma_map_single(priv->device, skb->data, 351 dma_buf_sz, DMA_FROM_DEVICE); 352 353 if (dma_mapping_error(priv->device, rx_ring->rx_skbuff_dma[i])) { 354 netdev_err(dev, "%s: DMA mapping error\n", __func__); 355 dev_kfree_skb_any(skb); 356 return -EINVAL; 357 } 358 359 p->rdes23.rx_rd_des23.buf2_addr = rx_ring->rx_skbuff_dma[i]; 360 361 return 0; 362 } 363 364 /** 365 * sxgbe_free_rx_buffers - free what sxgbe_init_rx_buffers() allocated 366 * @dev: net device structure 367 * @rx_ring: ring to be freed 368 * @rx_rsize: ring size 369 * Description: this function initializes the DMA RX descriptor 370 */ 371 static void sxgbe_free_rx_buffers(struct net_device *dev, 372 struct sxgbe_rx_norm_desc *p, int i, 373 unsigned int dma_buf_sz, 374 struct sxgbe_rx_queue *rx_ring) 375 { 376 struct sxgbe_priv_data *priv = netdev_priv(dev); 377 378 kfree_skb(rx_ring->rx_skbuff[i]); 379 dma_unmap_single(priv->device, rx_ring->rx_skbuff_dma[i], 380 dma_buf_sz, DMA_FROM_DEVICE); 381 } 382 383 /** 384 * init_tx_ring - init the TX descriptor ring 385 * @dev: net device structure 386 * @tx_ring: ring to be initialised 387 * @tx_rsize: ring size 388 * Description: this function initializes the DMA TX descriptor 389 */ 390 static int init_tx_ring(struct device *dev, u8 queue_no, 391 struct sxgbe_tx_queue *tx_ring, int tx_rsize) 392 { 393 /* TX ring is not allcoated */ 394 if (!tx_ring) { 395 dev_err(dev, "No memory for TX queue of SXGBE\n"); 396 return -ENOMEM; 397 } 398 399 /* allocate memory for TX descriptors */ 400 tx_ring->dma_tx = dma_alloc_coherent(dev, 401 tx_rsize * sizeof(struct sxgbe_tx_norm_desc), 402 &tx_ring->dma_tx_phy, GFP_KERNEL); 403 if (!tx_ring->dma_tx) 404 return -ENOMEM; 405 406 /* allocate memory for TX skbuff array */ 407 tx_ring->tx_skbuff_dma = devm_kcalloc(dev, tx_rsize, 408 sizeof(dma_addr_t), GFP_KERNEL); 409 if (!tx_ring->tx_skbuff_dma) 410 goto dmamem_err; 411 412 tx_ring->tx_skbuff = devm_kcalloc(dev, tx_rsize, 413 sizeof(struct sk_buff *), GFP_KERNEL); 414 415 if (!tx_ring->tx_skbuff) 416 goto dmamem_err; 417 418 /* assign queue number */ 419 tx_ring->queue_no = queue_no; 420 421 /* initialise counters */ 422 tx_ring->dirty_tx = 0; 423 tx_ring->cur_tx = 0; 424 425 return 0; 426 427 dmamem_err: 428 dma_free_coherent(dev, tx_rsize * sizeof(struct sxgbe_tx_norm_desc), 429 tx_ring->dma_tx, tx_ring->dma_tx_phy); 430 return -ENOMEM; 431 } 432 433 /** 434 * free_rx_ring - free the RX descriptor ring 435 * @dev: net device structure 436 * @rx_ring: ring to be initialised 437 * @rx_rsize: ring size 438 * Description: this function initializes the DMA RX descriptor 439 */ 440 static void free_rx_ring(struct device *dev, struct sxgbe_rx_queue *rx_ring, 441 int rx_rsize) 442 { 443 dma_free_coherent(dev, rx_rsize * sizeof(struct sxgbe_rx_norm_desc), 444 rx_ring->dma_rx, rx_ring->dma_rx_phy); 445 kfree(rx_ring->rx_skbuff_dma); 446 kfree(rx_ring->rx_skbuff); 447 } 448 449 /** 450 * init_rx_ring - init the RX descriptor ring 451 * @dev: net device structure 452 * @rx_ring: ring to be initialised 453 * @rx_rsize: ring size 454 * Description: this function initializes the DMA RX descriptor 455 */ 456 static int init_rx_ring(struct net_device *dev, u8 queue_no, 457 struct sxgbe_rx_queue *rx_ring, int rx_rsize) 458 { 459 struct sxgbe_priv_data *priv = netdev_priv(dev); 460 int desc_index; 461 unsigned int bfsize = 0; 462 unsigned int ret = 0; 463 464 /* Set the max buffer size according to the MTU. */ 465 bfsize = ALIGN(dev->mtu + ETH_HLEN + ETH_FCS_LEN + NET_IP_ALIGN, 8); 466 467 netif_dbg(priv, probe, dev, "%s: bfsize %d\n", __func__, bfsize); 468 469 /* RX ring is not allcoated */ 470 if (rx_ring == NULL) { 471 netdev_err(dev, "No memory for RX queue\n"); 472 return -ENOMEM; 473 } 474 475 /* assign queue number */ 476 rx_ring->queue_no = queue_no; 477 478 /* allocate memory for RX descriptors */ 479 rx_ring->dma_rx = dma_alloc_coherent(priv->device, 480 rx_rsize * sizeof(struct sxgbe_rx_norm_desc), 481 &rx_ring->dma_rx_phy, GFP_KERNEL); 482 483 if (rx_ring->dma_rx == NULL) 484 return -ENOMEM; 485 486 /* allocate memory for RX skbuff array */ 487 rx_ring->rx_skbuff_dma = kmalloc_array(rx_rsize, 488 sizeof(dma_addr_t), GFP_KERNEL); 489 if (!rx_ring->rx_skbuff_dma) { 490 ret = -ENOMEM; 491 goto err_free_dma_rx; 492 } 493 494 rx_ring->rx_skbuff = kmalloc_array(rx_rsize, 495 sizeof(struct sk_buff *), GFP_KERNEL); 496 if (!rx_ring->rx_skbuff) { 497 ret = -ENOMEM; 498 goto err_free_skbuff_dma; 499 } 500 501 /* initialise the buffers */ 502 for (desc_index = 0; desc_index < rx_rsize; desc_index++) { 503 struct sxgbe_rx_norm_desc *p; 504 p = rx_ring->dma_rx + desc_index; 505 ret = sxgbe_init_rx_buffers(dev, p, desc_index, 506 bfsize, rx_ring); 507 if (ret) 508 goto err_free_rx_buffers; 509 } 510 511 /* initialise counters */ 512 rx_ring->cur_rx = 0; 513 rx_ring->dirty_rx = (unsigned int)(desc_index - rx_rsize); 514 priv->dma_buf_sz = bfsize; 515 516 return 0; 517 518 err_free_rx_buffers: 519 while (--desc_index >= 0) { 520 struct sxgbe_rx_norm_desc *p; 521 522 p = rx_ring->dma_rx + desc_index; 523 sxgbe_free_rx_buffers(dev, p, desc_index, bfsize, rx_ring); 524 } 525 kfree(rx_ring->rx_skbuff); 526 err_free_skbuff_dma: 527 kfree(rx_ring->rx_skbuff_dma); 528 err_free_dma_rx: 529 dma_free_coherent(priv->device, 530 rx_rsize * sizeof(struct sxgbe_rx_norm_desc), 531 rx_ring->dma_rx, rx_ring->dma_rx_phy); 532 533 return ret; 534 } 535 /** 536 * free_tx_ring - free the TX descriptor ring 537 * @dev: net device structure 538 * @tx_ring: ring to be initialised 539 * @tx_rsize: ring size 540 * Description: this function initializes the DMA TX descriptor 541 */ 542 static void free_tx_ring(struct device *dev, struct sxgbe_tx_queue *tx_ring, 543 int tx_rsize) 544 { 545 dma_free_coherent(dev, tx_rsize * sizeof(struct sxgbe_tx_norm_desc), 546 tx_ring->dma_tx, tx_ring->dma_tx_phy); 547 } 548 549 /** 550 * init_dma_desc_rings - init the RX/TX descriptor rings 551 * @dev: net device structure 552 * Description: this function initializes the DMA RX/TX descriptors 553 * and allocates the socket buffers. It suppors the chained and ring 554 * modes. 555 */ 556 static int init_dma_desc_rings(struct net_device *netd) 557 { 558 int queue_num, ret; 559 struct sxgbe_priv_data *priv = netdev_priv(netd); 560 int tx_rsize = priv->dma_tx_size; 561 int rx_rsize = priv->dma_rx_size; 562 563 /* Allocate memory for queue structures and TX descs */ 564 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 565 ret = init_tx_ring(priv->device, queue_num, 566 priv->txq[queue_num], tx_rsize); 567 if (ret) { 568 dev_err(&netd->dev, "TX DMA ring allocation failed!\n"); 569 goto txalloc_err; 570 } 571 572 /* save private pointer in each ring this 573 * pointer is needed during cleaing TX queue 574 */ 575 priv->txq[queue_num]->priv_ptr = priv; 576 } 577 578 /* Allocate memory for queue structures and RX descs */ 579 SXGBE_FOR_EACH_QUEUE(SXGBE_RX_QUEUES, queue_num) { 580 ret = init_rx_ring(netd, queue_num, 581 priv->rxq[queue_num], rx_rsize); 582 if (ret) { 583 netdev_err(netd, "RX DMA ring allocation failed!!\n"); 584 goto rxalloc_err; 585 } 586 587 /* save private pointer in each ring this 588 * pointer is needed during cleaing TX queue 589 */ 590 priv->rxq[queue_num]->priv_ptr = priv; 591 } 592 593 sxgbe_clear_descriptors(priv); 594 595 return 0; 596 597 txalloc_err: 598 while (queue_num--) 599 free_tx_ring(priv->device, priv->txq[queue_num], tx_rsize); 600 return ret; 601 602 rxalloc_err: 603 while (queue_num--) 604 free_rx_ring(priv->device, priv->rxq[queue_num], rx_rsize); 605 return ret; 606 } 607 608 static void tx_free_ring_skbufs(struct sxgbe_tx_queue *txqueue) 609 { 610 int dma_desc; 611 struct sxgbe_priv_data *priv = txqueue->priv_ptr; 612 int tx_rsize = priv->dma_tx_size; 613 614 for (dma_desc = 0; dma_desc < tx_rsize; dma_desc++) { 615 struct sxgbe_tx_norm_desc *tdesc = txqueue->dma_tx + dma_desc; 616 617 if (txqueue->tx_skbuff_dma[dma_desc]) 618 dma_unmap_single(priv->device, 619 txqueue->tx_skbuff_dma[dma_desc], 620 priv->hw->desc->get_tx_len(tdesc), 621 DMA_TO_DEVICE); 622 623 dev_kfree_skb_any(txqueue->tx_skbuff[dma_desc]); 624 txqueue->tx_skbuff[dma_desc] = NULL; 625 txqueue->tx_skbuff_dma[dma_desc] = 0; 626 } 627 } 628 629 630 static void dma_free_tx_skbufs(struct sxgbe_priv_data *priv) 631 { 632 int queue_num; 633 634 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 635 struct sxgbe_tx_queue *tqueue = priv->txq[queue_num]; 636 tx_free_ring_skbufs(tqueue); 637 } 638 } 639 640 static void free_dma_desc_resources(struct sxgbe_priv_data *priv) 641 { 642 int queue_num; 643 int tx_rsize = priv->dma_tx_size; 644 int rx_rsize = priv->dma_rx_size; 645 646 /* Release the DMA TX buffers */ 647 dma_free_tx_skbufs(priv); 648 649 /* Release the TX ring memory also */ 650 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 651 free_tx_ring(priv->device, priv->txq[queue_num], tx_rsize); 652 } 653 654 /* Release the RX ring memory also */ 655 SXGBE_FOR_EACH_QUEUE(SXGBE_RX_QUEUES, queue_num) { 656 free_rx_ring(priv->device, priv->rxq[queue_num], rx_rsize); 657 } 658 } 659 660 static int txring_mem_alloc(struct sxgbe_priv_data *priv) 661 { 662 int queue_num; 663 664 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 665 priv->txq[queue_num] = devm_kmalloc(priv->device, 666 sizeof(struct sxgbe_tx_queue), GFP_KERNEL); 667 if (!priv->txq[queue_num]) 668 return -ENOMEM; 669 } 670 671 return 0; 672 } 673 674 static int rxring_mem_alloc(struct sxgbe_priv_data *priv) 675 { 676 int queue_num; 677 678 SXGBE_FOR_EACH_QUEUE(SXGBE_RX_QUEUES, queue_num) { 679 priv->rxq[queue_num] = devm_kmalloc(priv->device, 680 sizeof(struct sxgbe_rx_queue), GFP_KERNEL); 681 if (!priv->rxq[queue_num]) 682 return -ENOMEM; 683 } 684 685 return 0; 686 } 687 688 /** 689 * sxgbe_mtl_operation_mode - HW MTL operation mode 690 * @priv: driver private structure 691 * Description: it sets the MTL operation mode: tx/rx MTL thresholds 692 * or Store-And-Forward capability. 693 */ 694 static void sxgbe_mtl_operation_mode(struct sxgbe_priv_data *priv) 695 { 696 int queue_num; 697 698 /* TX/RX threshold control */ 699 if (likely(priv->plat->force_sf_dma_mode)) { 700 /* set TC mode for TX QUEUES */ 701 SXGBE_FOR_EACH_QUEUE(priv->hw_cap.tx_mtl_queues, queue_num) 702 priv->hw->mtl->set_tx_mtl_mode(priv->ioaddr, queue_num, 703 SXGBE_MTL_SFMODE); 704 priv->tx_tc = SXGBE_MTL_SFMODE; 705 706 /* set TC mode for RX QUEUES */ 707 SXGBE_FOR_EACH_QUEUE(priv->hw_cap.rx_mtl_queues, queue_num) 708 priv->hw->mtl->set_rx_mtl_mode(priv->ioaddr, queue_num, 709 SXGBE_MTL_SFMODE); 710 priv->rx_tc = SXGBE_MTL_SFMODE; 711 } else if (unlikely(priv->plat->force_thresh_dma_mode)) { 712 /* set TC mode for TX QUEUES */ 713 SXGBE_FOR_EACH_QUEUE(priv->hw_cap.tx_mtl_queues, queue_num) 714 priv->hw->mtl->set_tx_mtl_mode(priv->ioaddr, queue_num, 715 priv->tx_tc); 716 /* set TC mode for RX QUEUES */ 717 SXGBE_FOR_EACH_QUEUE(priv->hw_cap.rx_mtl_queues, queue_num) 718 priv->hw->mtl->set_rx_mtl_mode(priv->ioaddr, queue_num, 719 priv->rx_tc); 720 } else { 721 pr_err("ERROR: %s: Invalid TX threshold mode\n", __func__); 722 } 723 } 724 725 /** 726 * sxgbe_tx_queue_clean: 727 * @priv: driver private structure 728 * Description: it reclaims resources after transmission completes. 729 */ 730 static void sxgbe_tx_queue_clean(struct sxgbe_tx_queue *tqueue) 731 { 732 struct sxgbe_priv_data *priv = tqueue->priv_ptr; 733 unsigned int tx_rsize = priv->dma_tx_size; 734 struct netdev_queue *dev_txq; 735 u8 queue_no = tqueue->queue_no; 736 737 dev_txq = netdev_get_tx_queue(priv->dev, queue_no); 738 739 __netif_tx_lock(dev_txq, smp_processor_id()); 740 741 priv->xstats.tx_clean++; 742 while (tqueue->dirty_tx != tqueue->cur_tx) { 743 unsigned int entry = tqueue->dirty_tx % tx_rsize; 744 struct sk_buff *skb = tqueue->tx_skbuff[entry]; 745 struct sxgbe_tx_norm_desc *p; 746 747 p = tqueue->dma_tx + entry; 748 749 /* Check if the descriptor is owned by the DMA. */ 750 if (priv->hw->desc->get_tx_owner(p)) 751 break; 752 753 if (netif_msg_tx_done(priv)) 754 pr_debug("%s: curr %d, dirty %d\n", 755 __func__, tqueue->cur_tx, tqueue->dirty_tx); 756 757 if (likely(tqueue->tx_skbuff_dma[entry])) { 758 dma_unmap_single(priv->device, 759 tqueue->tx_skbuff_dma[entry], 760 priv->hw->desc->get_tx_len(p), 761 DMA_TO_DEVICE); 762 tqueue->tx_skbuff_dma[entry] = 0; 763 } 764 765 if (likely(skb)) { 766 dev_kfree_skb(skb); 767 tqueue->tx_skbuff[entry] = NULL; 768 } 769 770 priv->hw->desc->release_tx_desc(p); 771 772 tqueue->dirty_tx++; 773 } 774 775 /* wake up queue */ 776 if (unlikely(netif_tx_queue_stopped(dev_txq) && 777 sxgbe_tx_avail(tqueue, tx_rsize) > SXGBE_TX_THRESH(priv))) { 778 if (netif_msg_tx_done(priv)) 779 pr_debug("%s: restart transmit\n", __func__); 780 netif_tx_wake_queue(dev_txq); 781 } 782 783 __netif_tx_unlock(dev_txq); 784 } 785 786 /** 787 * sxgbe_tx_clean: 788 * @priv: driver private structure 789 * Description: it reclaims resources after transmission completes. 790 */ 791 static void sxgbe_tx_all_clean(struct sxgbe_priv_data * const priv) 792 { 793 u8 queue_num; 794 795 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 796 struct sxgbe_tx_queue *tqueue = priv->txq[queue_num]; 797 798 sxgbe_tx_queue_clean(tqueue); 799 } 800 801 if ((priv->eee_enabled) && (!priv->tx_path_in_lpi_mode)) { 802 sxgbe_enable_eee_mode(priv); 803 mod_timer(&priv->eee_ctrl_timer, SXGBE_LPI_TIMER(eee_timer)); 804 } 805 } 806 807 /** 808 * sxgbe_restart_tx_queue: irq tx error mng function 809 * @priv: driver private structure 810 * Description: it cleans the descriptors and restarts the transmission 811 * in case of errors. 812 */ 813 static void sxgbe_restart_tx_queue(struct sxgbe_priv_data *priv, int queue_num) 814 { 815 struct sxgbe_tx_queue *tx_ring = priv->txq[queue_num]; 816 struct netdev_queue *dev_txq = netdev_get_tx_queue(priv->dev, 817 queue_num); 818 819 /* stop the queue */ 820 netif_tx_stop_queue(dev_txq); 821 822 /* stop the tx dma */ 823 priv->hw->dma->stop_tx_queue(priv->ioaddr, queue_num); 824 825 /* free the skbuffs of the ring */ 826 tx_free_ring_skbufs(tx_ring); 827 828 /* initialise counters */ 829 tx_ring->cur_tx = 0; 830 tx_ring->dirty_tx = 0; 831 832 /* start the tx dma */ 833 priv->hw->dma->start_tx_queue(priv->ioaddr, queue_num); 834 835 priv->dev->stats.tx_errors++; 836 837 /* wakeup the queue */ 838 netif_tx_wake_queue(dev_txq); 839 } 840 841 /** 842 * sxgbe_reset_all_tx_queues: irq tx error mng function 843 * @priv: driver private structure 844 * Description: it cleans all the descriptors and 845 * restarts the transmission on all queues in case of errors. 846 */ 847 static void sxgbe_reset_all_tx_queues(struct sxgbe_priv_data *priv) 848 { 849 int queue_num; 850 851 /* On TX timeout of net device, resetting of all queues 852 * may not be proper way, revisit this later if needed 853 */ 854 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) 855 sxgbe_restart_tx_queue(priv, queue_num); 856 } 857 858 /** 859 * sxgbe_get_hw_features: get XMAC capabilities from the HW cap. register. 860 * @priv: driver private structure 861 * Description: 862 * new GMAC chip generations have a new register to indicate the 863 * presence of the optional feature/functions. 864 * This can be also used to override the value passed through the 865 * platform and necessary for old MAC10/100 and GMAC chips. 866 */ 867 static int sxgbe_get_hw_features(struct sxgbe_priv_data * const priv) 868 { 869 int rval = 0; 870 struct sxgbe_hw_features *features = &priv->hw_cap; 871 872 /* Read First Capability Register CAP[0] */ 873 rval = priv->hw->mac->get_hw_feature(priv->ioaddr, 0); 874 if (rval) { 875 features->pmt_remote_wake_up = 876 SXGBE_HW_FEAT_PMT_TEMOTE_WOP(rval); 877 features->pmt_magic_frame = SXGBE_HW_FEAT_PMT_MAGIC_PKT(rval); 878 features->atime_stamp = SXGBE_HW_FEAT_IEEE1500_2008(rval); 879 features->tx_csum_offload = 880 SXGBE_HW_FEAT_TX_CSUM_OFFLOAD(rval); 881 features->rx_csum_offload = 882 SXGBE_HW_FEAT_RX_CSUM_OFFLOAD(rval); 883 features->multi_macaddr = SXGBE_HW_FEAT_MACADDR_COUNT(rval); 884 features->tstamp_srcselect = SXGBE_HW_FEAT_TSTMAP_SRC(rval); 885 features->sa_vlan_insert = SXGBE_HW_FEAT_SRCADDR_VLAN(rval); 886 features->eee = SXGBE_HW_FEAT_EEE(rval); 887 } 888 889 /* Read First Capability Register CAP[1] */ 890 rval = priv->hw->mac->get_hw_feature(priv->ioaddr, 1); 891 if (rval) { 892 features->rxfifo_size = SXGBE_HW_FEAT_RX_FIFO_SIZE(rval); 893 features->txfifo_size = SXGBE_HW_FEAT_TX_FIFO_SIZE(rval); 894 features->atstmap_hword = SXGBE_HW_FEAT_TX_FIFO_SIZE(rval); 895 features->dcb_enable = SXGBE_HW_FEAT_DCB(rval); 896 features->splithead_enable = SXGBE_HW_FEAT_SPLIT_HDR(rval); 897 features->tcpseg_offload = SXGBE_HW_FEAT_TSO(rval); 898 features->debug_mem = SXGBE_HW_FEAT_DEBUG_MEM_IFACE(rval); 899 features->rss_enable = SXGBE_HW_FEAT_RSS(rval); 900 features->hash_tsize = SXGBE_HW_FEAT_HASH_TABLE_SIZE(rval); 901 features->l3l4_filer_size = SXGBE_HW_FEAT_L3L4_FILTER_NUM(rval); 902 } 903 904 /* Read First Capability Register CAP[2] */ 905 rval = priv->hw->mac->get_hw_feature(priv->ioaddr, 2); 906 if (rval) { 907 features->rx_mtl_queues = SXGBE_HW_FEAT_RX_MTL_QUEUES(rval); 908 features->tx_mtl_queues = SXGBE_HW_FEAT_TX_MTL_QUEUES(rval); 909 features->rx_dma_channels = SXGBE_HW_FEAT_RX_DMA_CHANNELS(rval); 910 features->tx_dma_channels = SXGBE_HW_FEAT_TX_DMA_CHANNELS(rval); 911 features->pps_output_count = SXGBE_HW_FEAT_PPS_OUTPUTS(rval); 912 features->aux_input_count = SXGBE_HW_FEAT_AUX_SNAPSHOTS(rval); 913 } 914 915 return rval; 916 } 917 918 /** 919 * sxgbe_check_ether_addr: check if the MAC addr is valid 920 * @priv: driver private structure 921 * Description: 922 * it is to verify if the MAC address is valid, in case of failures it 923 * generates a random MAC address 924 */ 925 static void sxgbe_check_ether_addr(struct sxgbe_priv_data *priv) 926 { 927 if (!is_valid_ether_addr(priv->dev->dev_addr)) { 928 priv->hw->mac->get_umac_addr((void __iomem *) 929 priv->ioaddr, 930 priv->dev->dev_addr, 0); 931 if (!is_valid_ether_addr(priv->dev->dev_addr)) 932 eth_hw_addr_random(priv->dev); 933 } 934 dev_info(priv->device, "device MAC address %pM\n", 935 priv->dev->dev_addr); 936 } 937 938 /** 939 * sxgbe_init_dma_engine: DMA init. 940 * @priv: driver private structure 941 * Description: 942 * It inits the DMA invoking the specific SXGBE callback. 943 * Some DMA parameters can be passed from the platform; 944 * in case of these are not passed a default is kept for the MAC or GMAC. 945 */ 946 static int sxgbe_init_dma_engine(struct sxgbe_priv_data *priv) 947 { 948 int pbl = DEFAULT_DMA_PBL, fixed_burst = 0, burst_map = 0; 949 int queue_num; 950 951 if (priv->plat->dma_cfg) { 952 pbl = priv->plat->dma_cfg->pbl; 953 fixed_burst = priv->plat->dma_cfg->fixed_burst; 954 burst_map = priv->plat->dma_cfg->burst_map; 955 } 956 957 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) 958 priv->hw->dma->cha_init(priv->ioaddr, queue_num, 959 fixed_burst, pbl, 960 (priv->txq[queue_num])->dma_tx_phy, 961 (priv->rxq[queue_num])->dma_rx_phy, 962 priv->dma_tx_size, priv->dma_rx_size); 963 964 return priv->hw->dma->init(priv->ioaddr, fixed_burst, burst_map); 965 } 966 967 /** 968 * sxgbe_init_mtl_engine: MTL init. 969 * @priv: driver private structure 970 * Description: 971 * It inits the MTL invoking the specific SXGBE callback. 972 */ 973 static void sxgbe_init_mtl_engine(struct sxgbe_priv_data *priv) 974 { 975 int queue_num; 976 977 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 978 priv->hw->mtl->mtl_set_txfifosize(priv->ioaddr, queue_num, 979 priv->hw_cap.tx_mtl_qsize); 980 priv->hw->mtl->mtl_enable_txqueue(priv->ioaddr, queue_num); 981 } 982 } 983 984 /** 985 * sxgbe_disable_mtl_engine: MTL disable. 986 * @priv: driver private structure 987 * Description: 988 * It disables the MTL queues by invoking the specific SXGBE callback. 989 */ 990 static void sxgbe_disable_mtl_engine(struct sxgbe_priv_data *priv) 991 { 992 int queue_num; 993 994 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) 995 priv->hw->mtl->mtl_disable_txqueue(priv->ioaddr, queue_num); 996 } 997 998 999 /** 1000 * sxgbe_tx_timer: mitigation sw timer for tx. 1001 * @t: timer pointer 1002 * Description: 1003 * This is the timer handler to directly invoke the sxgbe_tx_clean. 1004 */ 1005 static void sxgbe_tx_timer(struct timer_list *t) 1006 { 1007 struct sxgbe_tx_queue *p = from_timer(p, t, txtimer); 1008 sxgbe_tx_queue_clean(p); 1009 } 1010 1011 /** 1012 * sxgbe_init_tx_coalesce: init tx mitigation options. 1013 * @priv: driver private structure 1014 * Description: 1015 * This inits the transmit coalesce parameters: i.e. timer rate, 1016 * timer handler and default threshold used for enabling the 1017 * interrupt on completion bit. 1018 */ 1019 static void sxgbe_tx_init_coalesce(struct sxgbe_priv_data *priv) 1020 { 1021 u8 queue_num; 1022 1023 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 1024 struct sxgbe_tx_queue *p = priv->txq[queue_num]; 1025 p->tx_coal_frames = SXGBE_TX_FRAMES; 1026 p->tx_coal_timer = SXGBE_COAL_TX_TIMER; 1027 timer_setup(&p->txtimer, sxgbe_tx_timer, 0); 1028 p->txtimer.expires = SXGBE_COAL_TIMER(p->tx_coal_timer); 1029 add_timer(&p->txtimer); 1030 } 1031 } 1032 1033 static void sxgbe_tx_del_timer(struct sxgbe_priv_data *priv) 1034 { 1035 u8 queue_num; 1036 1037 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 1038 struct sxgbe_tx_queue *p = priv->txq[queue_num]; 1039 del_timer_sync(&p->txtimer); 1040 } 1041 } 1042 1043 /** 1044 * sxgbe_open - open entry point of the driver 1045 * @dev : pointer to the device structure. 1046 * Description: 1047 * This function is the open entry point of the driver. 1048 * Return value: 1049 * 0 on success and an appropriate (-)ve integer as defined in errno.h 1050 * file on failure. 1051 */ 1052 static int sxgbe_open(struct net_device *dev) 1053 { 1054 struct sxgbe_priv_data *priv = netdev_priv(dev); 1055 int ret, queue_num; 1056 1057 clk_prepare_enable(priv->sxgbe_clk); 1058 1059 sxgbe_check_ether_addr(priv); 1060 1061 /* Init the phy */ 1062 ret = sxgbe_init_phy(dev); 1063 if (ret) { 1064 netdev_err(dev, "%s: Cannot attach to PHY (error: %d)\n", 1065 __func__, ret); 1066 goto phy_error; 1067 } 1068 1069 /* Create and initialize the TX/RX descriptors chains. */ 1070 priv->dma_tx_size = SXGBE_ALIGN(DMA_TX_SIZE); 1071 priv->dma_rx_size = SXGBE_ALIGN(DMA_RX_SIZE); 1072 priv->dma_buf_sz = SXGBE_ALIGN(DMA_BUFFER_SIZE); 1073 priv->tx_tc = TC_DEFAULT; 1074 priv->rx_tc = TC_DEFAULT; 1075 init_dma_desc_rings(dev); 1076 1077 /* DMA initialization and SW reset */ 1078 ret = sxgbe_init_dma_engine(priv); 1079 if (ret < 0) { 1080 netdev_err(dev, "%s: DMA initialization failed\n", __func__); 1081 goto init_error; 1082 } 1083 1084 /* MTL initialization */ 1085 sxgbe_init_mtl_engine(priv); 1086 1087 /* Copy the MAC addr into the HW */ 1088 priv->hw->mac->set_umac_addr(priv->ioaddr, dev->dev_addr, 0); 1089 1090 /* Initialize the MAC Core */ 1091 priv->hw->mac->core_init(priv->ioaddr); 1092 SXGBE_FOR_EACH_QUEUE(SXGBE_RX_QUEUES, queue_num) { 1093 priv->hw->mac->enable_rxqueue(priv->ioaddr, queue_num); 1094 } 1095 1096 /* Request the IRQ lines */ 1097 ret = devm_request_irq(priv->device, priv->irq, sxgbe_common_interrupt, 1098 IRQF_SHARED, dev->name, dev); 1099 if (unlikely(ret < 0)) { 1100 netdev_err(dev, "%s: ERROR: allocating the IRQ %d (error: %d)\n", 1101 __func__, priv->irq, ret); 1102 goto init_error; 1103 } 1104 1105 /* If the LPI irq is different from the mac irq 1106 * register a dedicated handler 1107 */ 1108 if (priv->lpi_irq != dev->irq) { 1109 ret = devm_request_irq(priv->device, priv->lpi_irq, 1110 sxgbe_common_interrupt, 1111 IRQF_SHARED, dev->name, dev); 1112 if (unlikely(ret < 0)) { 1113 netdev_err(dev, "%s: ERROR: allocating the LPI IRQ %d (%d)\n", 1114 __func__, priv->lpi_irq, ret); 1115 goto init_error; 1116 } 1117 } 1118 1119 /* Request TX DMA irq lines */ 1120 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 1121 ret = devm_request_irq(priv->device, 1122 (priv->txq[queue_num])->irq_no, 1123 sxgbe_tx_interrupt, 0, 1124 dev->name, priv->txq[queue_num]); 1125 if (unlikely(ret < 0)) { 1126 netdev_err(dev, "%s: ERROR: allocating TX IRQ %d (error: %d)\n", 1127 __func__, priv->irq, ret); 1128 goto init_error; 1129 } 1130 } 1131 1132 /* Request RX DMA irq lines */ 1133 SXGBE_FOR_EACH_QUEUE(SXGBE_RX_QUEUES, queue_num) { 1134 ret = devm_request_irq(priv->device, 1135 (priv->rxq[queue_num])->irq_no, 1136 sxgbe_rx_interrupt, 0, 1137 dev->name, priv->rxq[queue_num]); 1138 if (unlikely(ret < 0)) { 1139 netdev_err(dev, "%s: ERROR: allocating TX IRQ %d (error: %d)\n", 1140 __func__, priv->irq, ret); 1141 goto init_error; 1142 } 1143 } 1144 1145 /* Enable the MAC Rx/Tx */ 1146 priv->hw->mac->enable_tx(priv->ioaddr, true); 1147 priv->hw->mac->enable_rx(priv->ioaddr, true); 1148 1149 /* Set the HW DMA mode and the COE */ 1150 sxgbe_mtl_operation_mode(priv); 1151 1152 /* Extra statistics */ 1153 memset(&priv->xstats, 0, sizeof(struct sxgbe_extra_stats)); 1154 1155 priv->xstats.tx_threshold = priv->tx_tc; 1156 priv->xstats.rx_threshold = priv->rx_tc; 1157 1158 /* Start the ball rolling... */ 1159 netdev_dbg(dev, "DMA RX/TX processes started...\n"); 1160 priv->hw->dma->start_tx(priv->ioaddr, SXGBE_TX_QUEUES); 1161 priv->hw->dma->start_rx(priv->ioaddr, SXGBE_RX_QUEUES); 1162 1163 if (dev->phydev) 1164 phy_start(dev->phydev); 1165 1166 /* initialise TX coalesce parameters */ 1167 sxgbe_tx_init_coalesce(priv); 1168 1169 if ((priv->use_riwt) && (priv->hw->dma->rx_watchdog)) { 1170 priv->rx_riwt = SXGBE_MAX_DMA_RIWT; 1171 priv->hw->dma->rx_watchdog(priv->ioaddr, SXGBE_MAX_DMA_RIWT); 1172 } 1173 1174 priv->tx_lpi_timer = SXGBE_DEFAULT_LPI_TIMER; 1175 priv->eee_enabled = sxgbe_eee_init(priv); 1176 1177 napi_enable(&priv->napi); 1178 netif_start_queue(dev); 1179 1180 return 0; 1181 1182 init_error: 1183 free_dma_desc_resources(priv); 1184 if (dev->phydev) 1185 phy_disconnect(dev->phydev); 1186 phy_error: 1187 clk_disable_unprepare(priv->sxgbe_clk); 1188 1189 return ret; 1190 } 1191 1192 /** 1193 * sxgbe_release - close entry point of the driver 1194 * @dev : device pointer. 1195 * Description: 1196 * This is the stop entry point of the driver. 1197 */ 1198 static int sxgbe_release(struct net_device *dev) 1199 { 1200 struct sxgbe_priv_data *priv = netdev_priv(dev); 1201 1202 if (priv->eee_enabled) 1203 del_timer_sync(&priv->eee_ctrl_timer); 1204 1205 /* Stop and disconnect the PHY */ 1206 if (dev->phydev) { 1207 phy_stop(dev->phydev); 1208 phy_disconnect(dev->phydev); 1209 } 1210 1211 netif_tx_stop_all_queues(dev); 1212 1213 napi_disable(&priv->napi); 1214 1215 /* delete TX timers */ 1216 sxgbe_tx_del_timer(priv); 1217 1218 /* Stop TX/RX DMA and clear the descriptors */ 1219 priv->hw->dma->stop_tx(priv->ioaddr, SXGBE_TX_QUEUES); 1220 priv->hw->dma->stop_rx(priv->ioaddr, SXGBE_RX_QUEUES); 1221 1222 /* disable MTL queue */ 1223 sxgbe_disable_mtl_engine(priv); 1224 1225 /* Release and free the Rx/Tx resources */ 1226 free_dma_desc_resources(priv); 1227 1228 /* Disable the MAC Rx/Tx */ 1229 priv->hw->mac->enable_tx(priv->ioaddr, false); 1230 priv->hw->mac->enable_rx(priv->ioaddr, false); 1231 1232 clk_disable_unprepare(priv->sxgbe_clk); 1233 1234 return 0; 1235 } 1236 /* Prepare first Tx descriptor for doing TSO operation */ 1237 static void sxgbe_tso_prepare(struct sxgbe_priv_data *priv, 1238 struct sxgbe_tx_norm_desc *first_desc, 1239 struct sk_buff *skb) 1240 { 1241 unsigned int total_hdr_len, tcp_hdr_len; 1242 1243 /* Write first Tx descriptor with appropriate value */ 1244 tcp_hdr_len = tcp_hdrlen(skb); 1245 total_hdr_len = skb_transport_offset(skb) + tcp_hdr_len; 1246 1247 first_desc->tdes01 = dma_map_single(priv->device, skb->data, 1248 total_hdr_len, DMA_TO_DEVICE); 1249 if (dma_mapping_error(priv->device, first_desc->tdes01)) 1250 pr_err("%s: TX dma mapping failed!!\n", __func__); 1251 1252 first_desc->tdes23.tx_rd_des23.first_desc = 1; 1253 priv->hw->desc->tx_desc_enable_tse(first_desc, 1, total_hdr_len, 1254 tcp_hdr_len, 1255 skb->len - total_hdr_len); 1256 } 1257 1258 /** 1259 * sxgbe_xmit: Tx entry point of the driver 1260 * @skb : the socket buffer 1261 * @dev : device pointer 1262 * Description : this is the tx entry point of the driver. 1263 * It programs the chain or the ring and supports oversized frames 1264 * and SG feature. 1265 */ 1266 static netdev_tx_t sxgbe_xmit(struct sk_buff *skb, struct net_device *dev) 1267 { 1268 unsigned int entry, frag_num; 1269 int cksum_flag = 0; 1270 struct netdev_queue *dev_txq; 1271 unsigned txq_index = skb_get_queue_mapping(skb); 1272 struct sxgbe_priv_data *priv = netdev_priv(dev); 1273 unsigned int tx_rsize = priv->dma_tx_size; 1274 struct sxgbe_tx_queue *tqueue = priv->txq[txq_index]; 1275 struct sxgbe_tx_norm_desc *tx_desc, *first_desc; 1276 struct sxgbe_tx_ctxt_desc *ctxt_desc = NULL; 1277 int nr_frags = skb_shinfo(skb)->nr_frags; 1278 int no_pagedlen = skb_headlen(skb); 1279 int is_jumbo = 0; 1280 u16 cur_mss = skb_shinfo(skb)->gso_size; 1281 u32 ctxt_desc_req = 0; 1282 1283 /* get the TX queue handle */ 1284 dev_txq = netdev_get_tx_queue(dev, txq_index); 1285 1286 if (unlikely(skb_is_gso(skb) && tqueue->prev_mss != cur_mss)) 1287 ctxt_desc_req = 1; 1288 1289 if (unlikely(skb_vlan_tag_present(skb) || 1290 ((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) && 1291 tqueue->hwts_tx_en))) 1292 ctxt_desc_req = 1; 1293 1294 if (priv->tx_path_in_lpi_mode) 1295 sxgbe_disable_eee_mode(priv); 1296 1297 if (unlikely(sxgbe_tx_avail(tqueue, tx_rsize) < nr_frags + 1)) { 1298 if (!netif_tx_queue_stopped(dev_txq)) { 1299 netif_tx_stop_queue(dev_txq); 1300 netdev_err(dev, "%s: Tx Ring is full when %d queue is awake\n", 1301 __func__, txq_index); 1302 } 1303 return NETDEV_TX_BUSY; 1304 } 1305 1306 entry = tqueue->cur_tx % tx_rsize; 1307 tx_desc = tqueue->dma_tx + entry; 1308 1309 first_desc = tx_desc; 1310 if (ctxt_desc_req) 1311 ctxt_desc = (struct sxgbe_tx_ctxt_desc *)first_desc; 1312 1313 /* save the skb address */ 1314 tqueue->tx_skbuff[entry] = skb; 1315 1316 if (!is_jumbo) { 1317 if (likely(skb_is_gso(skb))) { 1318 /* TSO support */ 1319 if (unlikely(tqueue->prev_mss != cur_mss)) { 1320 priv->hw->desc->tx_ctxt_desc_set_mss( 1321 ctxt_desc, cur_mss); 1322 priv->hw->desc->tx_ctxt_desc_set_tcmssv( 1323 ctxt_desc); 1324 priv->hw->desc->tx_ctxt_desc_reset_ostc( 1325 ctxt_desc); 1326 priv->hw->desc->tx_ctxt_desc_set_ctxt( 1327 ctxt_desc); 1328 priv->hw->desc->tx_ctxt_desc_set_owner( 1329 ctxt_desc); 1330 1331 entry = (++tqueue->cur_tx) % tx_rsize; 1332 first_desc = tqueue->dma_tx + entry; 1333 1334 tqueue->prev_mss = cur_mss; 1335 } 1336 sxgbe_tso_prepare(priv, first_desc, skb); 1337 } else { 1338 tx_desc->tdes01 = dma_map_single(priv->device, 1339 skb->data, no_pagedlen, DMA_TO_DEVICE); 1340 if (dma_mapping_error(priv->device, tx_desc->tdes01)) 1341 netdev_err(dev, "%s: TX dma mapping failed!!\n", 1342 __func__); 1343 1344 priv->hw->desc->prepare_tx_desc(tx_desc, 1, no_pagedlen, 1345 no_pagedlen, cksum_flag); 1346 } 1347 } 1348 1349 for (frag_num = 0; frag_num < nr_frags; frag_num++) { 1350 const skb_frag_t *frag = &skb_shinfo(skb)->frags[frag_num]; 1351 int len = skb_frag_size(frag); 1352 1353 entry = (++tqueue->cur_tx) % tx_rsize; 1354 tx_desc = tqueue->dma_tx + entry; 1355 tx_desc->tdes01 = skb_frag_dma_map(priv->device, frag, 0, len, 1356 DMA_TO_DEVICE); 1357 1358 tqueue->tx_skbuff_dma[entry] = tx_desc->tdes01; 1359 tqueue->tx_skbuff[entry] = NULL; 1360 1361 /* prepare the descriptor */ 1362 priv->hw->desc->prepare_tx_desc(tx_desc, 0, len, 1363 len, cksum_flag); 1364 /* memory barrier to flush descriptor */ 1365 wmb(); 1366 1367 /* set the owner */ 1368 priv->hw->desc->set_tx_owner(tx_desc); 1369 } 1370 1371 /* close the descriptors */ 1372 priv->hw->desc->close_tx_desc(tx_desc); 1373 1374 /* memory barrier to flush descriptor */ 1375 wmb(); 1376 1377 tqueue->tx_count_frames += nr_frags + 1; 1378 if (tqueue->tx_count_frames > tqueue->tx_coal_frames) { 1379 priv->hw->desc->clear_tx_ic(tx_desc); 1380 priv->xstats.tx_reset_ic_bit++; 1381 mod_timer(&tqueue->txtimer, 1382 SXGBE_COAL_TIMER(tqueue->tx_coal_timer)); 1383 } else { 1384 tqueue->tx_count_frames = 0; 1385 } 1386 1387 /* set owner for first desc */ 1388 priv->hw->desc->set_tx_owner(first_desc); 1389 1390 /* memory barrier to flush descriptor */ 1391 wmb(); 1392 1393 tqueue->cur_tx++; 1394 1395 /* display current ring */ 1396 netif_dbg(priv, pktdata, dev, "%s: curr %d dirty=%d entry=%d, first=%p, nfrags=%d\n", 1397 __func__, tqueue->cur_tx % tx_rsize, 1398 tqueue->dirty_tx % tx_rsize, entry, 1399 first_desc, nr_frags); 1400 1401 if (unlikely(sxgbe_tx_avail(tqueue, tx_rsize) <= (MAX_SKB_FRAGS + 1))) { 1402 netif_dbg(priv, hw, dev, "%s: stop transmitted packets\n", 1403 __func__); 1404 netif_tx_stop_queue(dev_txq); 1405 } 1406 1407 dev->stats.tx_bytes += skb->len; 1408 1409 if (unlikely((skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) && 1410 tqueue->hwts_tx_en)) { 1411 /* declare that device is doing timestamping */ 1412 skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS; 1413 priv->hw->desc->tx_enable_tstamp(first_desc); 1414 } 1415 1416 skb_tx_timestamp(skb); 1417 1418 priv->hw->dma->enable_dma_transmission(priv->ioaddr, txq_index); 1419 1420 return NETDEV_TX_OK; 1421 } 1422 1423 /** 1424 * sxgbe_rx_refill: refill used skb preallocated buffers 1425 * @priv: driver private structure 1426 * Description : this is to reallocate the skb for the reception process 1427 * that is based on zero-copy. 1428 */ 1429 static void sxgbe_rx_refill(struct sxgbe_priv_data *priv) 1430 { 1431 unsigned int rxsize = priv->dma_rx_size; 1432 int bfsize = priv->dma_buf_sz; 1433 u8 qnum = priv->cur_rx_qnum; 1434 1435 for (; priv->rxq[qnum]->cur_rx - priv->rxq[qnum]->dirty_rx > 0; 1436 priv->rxq[qnum]->dirty_rx++) { 1437 unsigned int entry = priv->rxq[qnum]->dirty_rx % rxsize; 1438 struct sxgbe_rx_norm_desc *p; 1439 1440 p = priv->rxq[qnum]->dma_rx + entry; 1441 1442 if (likely(priv->rxq[qnum]->rx_skbuff[entry] == NULL)) { 1443 struct sk_buff *skb; 1444 1445 skb = netdev_alloc_skb_ip_align(priv->dev, bfsize); 1446 1447 if (unlikely(skb == NULL)) 1448 break; 1449 1450 priv->rxq[qnum]->rx_skbuff[entry] = skb; 1451 priv->rxq[qnum]->rx_skbuff_dma[entry] = 1452 dma_map_single(priv->device, skb->data, bfsize, 1453 DMA_FROM_DEVICE); 1454 1455 p->rdes23.rx_rd_des23.buf2_addr = 1456 priv->rxq[qnum]->rx_skbuff_dma[entry]; 1457 } 1458 1459 /* Added memory barrier for RX descriptor modification */ 1460 wmb(); 1461 priv->hw->desc->set_rx_owner(p); 1462 priv->hw->desc->set_rx_int_on_com(p); 1463 /* Added memory barrier for RX descriptor modification */ 1464 wmb(); 1465 } 1466 } 1467 1468 /** 1469 * sxgbe_rx: receive the frames from the remote host 1470 * @priv: driver private structure 1471 * @limit: napi bugget. 1472 * Description : this the function called by the napi poll method. 1473 * It gets all the frames inside the ring. 1474 */ 1475 static int sxgbe_rx(struct sxgbe_priv_data *priv, int limit) 1476 { 1477 u8 qnum = priv->cur_rx_qnum; 1478 unsigned int rxsize = priv->dma_rx_size; 1479 unsigned int entry = priv->rxq[qnum]->cur_rx; 1480 unsigned int next_entry = 0; 1481 unsigned int count = 0; 1482 int checksum; 1483 int status; 1484 1485 while (count < limit) { 1486 struct sxgbe_rx_norm_desc *p; 1487 struct sk_buff *skb; 1488 int frame_len; 1489 1490 p = priv->rxq[qnum]->dma_rx + entry; 1491 1492 if (priv->hw->desc->get_rx_owner(p)) 1493 break; 1494 1495 count++; 1496 1497 next_entry = (++priv->rxq[qnum]->cur_rx) % rxsize; 1498 prefetch(priv->rxq[qnum]->dma_rx + next_entry); 1499 1500 /* Read the status of the incoming frame and also get checksum 1501 * value based on whether it is enabled in SXGBE hardware or 1502 * not. 1503 */ 1504 status = priv->hw->desc->rx_wbstatus(p, &priv->xstats, 1505 &checksum); 1506 if (unlikely(status < 0)) { 1507 entry = next_entry; 1508 continue; 1509 } 1510 if (unlikely(!priv->rxcsum_insertion)) 1511 checksum = CHECKSUM_NONE; 1512 1513 skb = priv->rxq[qnum]->rx_skbuff[entry]; 1514 1515 if (unlikely(!skb)) 1516 netdev_err(priv->dev, "rx descriptor is not consistent\n"); 1517 1518 prefetch(skb->data - NET_IP_ALIGN); 1519 priv->rxq[qnum]->rx_skbuff[entry] = NULL; 1520 1521 frame_len = priv->hw->desc->get_rx_frame_len(p); 1522 1523 skb_put(skb, frame_len); 1524 1525 skb->ip_summed = checksum; 1526 if (checksum == CHECKSUM_NONE) 1527 netif_receive_skb(skb); 1528 else 1529 napi_gro_receive(&priv->napi, skb); 1530 1531 entry = next_entry; 1532 } 1533 1534 sxgbe_rx_refill(priv); 1535 1536 return count; 1537 } 1538 1539 /** 1540 * sxgbe_poll - sxgbe poll method (NAPI) 1541 * @napi : pointer to the napi structure. 1542 * @budget : maximum number of packets that the current CPU can receive from 1543 * all interfaces. 1544 * Description : 1545 * To look at the incoming frames and clear the tx resources. 1546 */ 1547 static int sxgbe_poll(struct napi_struct *napi, int budget) 1548 { 1549 struct sxgbe_priv_data *priv = container_of(napi, 1550 struct sxgbe_priv_data, napi); 1551 int work_done = 0; 1552 u8 qnum = priv->cur_rx_qnum; 1553 1554 priv->xstats.napi_poll++; 1555 /* first, clean the tx queues */ 1556 sxgbe_tx_all_clean(priv); 1557 1558 work_done = sxgbe_rx(priv, budget); 1559 if (work_done < budget) { 1560 napi_complete_done(napi, work_done); 1561 priv->hw->dma->enable_dma_irq(priv->ioaddr, qnum); 1562 } 1563 1564 return work_done; 1565 } 1566 1567 /** 1568 * sxgbe_tx_timeout 1569 * @dev : Pointer to net device structure 1570 * Description: this function is called when a packet transmission fails to 1571 * complete within a reasonable time. The driver will mark the error in the 1572 * netdev structure and arrange for the device to be reset to a sane state 1573 * in order to transmit a new packet. 1574 */ 1575 static void sxgbe_tx_timeout(struct net_device *dev) 1576 { 1577 struct sxgbe_priv_data *priv = netdev_priv(dev); 1578 1579 sxgbe_reset_all_tx_queues(priv); 1580 } 1581 1582 /** 1583 * sxgbe_common_interrupt - main ISR 1584 * @irq: interrupt number. 1585 * @dev_id: to pass the net device pointer. 1586 * Description: this is the main driver interrupt service routine. 1587 * It calls the DMA ISR and also the core ISR to manage PMT, MMC, LPI 1588 * interrupts. 1589 */ 1590 static irqreturn_t sxgbe_common_interrupt(int irq, void *dev_id) 1591 { 1592 struct net_device *netdev = (struct net_device *)dev_id; 1593 struct sxgbe_priv_data *priv = netdev_priv(netdev); 1594 int status; 1595 1596 status = priv->hw->mac->host_irq_status(priv->ioaddr, &priv->xstats); 1597 /* For LPI we need to save the tx status */ 1598 if (status & TX_ENTRY_LPI_MODE) { 1599 priv->xstats.tx_lpi_entry_n++; 1600 priv->tx_path_in_lpi_mode = true; 1601 } 1602 if (status & TX_EXIT_LPI_MODE) { 1603 priv->xstats.tx_lpi_exit_n++; 1604 priv->tx_path_in_lpi_mode = false; 1605 } 1606 if (status & RX_ENTRY_LPI_MODE) 1607 priv->xstats.rx_lpi_entry_n++; 1608 if (status & RX_EXIT_LPI_MODE) 1609 priv->xstats.rx_lpi_exit_n++; 1610 1611 return IRQ_HANDLED; 1612 } 1613 1614 /** 1615 * sxgbe_tx_interrupt - TX DMA ISR 1616 * @irq: interrupt number. 1617 * @dev_id: to pass the net device pointer. 1618 * Description: this is the tx dma interrupt service routine. 1619 */ 1620 static irqreturn_t sxgbe_tx_interrupt(int irq, void *dev_id) 1621 { 1622 int status; 1623 struct sxgbe_tx_queue *txq = (struct sxgbe_tx_queue *)dev_id; 1624 struct sxgbe_priv_data *priv = txq->priv_ptr; 1625 1626 /* get the channel status */ 1627 status = priv->hw->dma->tx_dma_int_status(priv->ioaddr, txq->queue_no, 1628 &priv->xstats); 1629 /* check for normal path */ 1630 if (likely((status & handle_tx))) 1631 napi_schedule(&priv->napi); 1632 1633 /* check for unrecoverable error */ 1634 if (unlikely((status & tx_hard_error))) 1635 sxgbe_restart_tx_queue(priv, txq->queue_no); 1636 1637 /* check for TC configuration change */ 1638 if (unlikely((status & tx_bump_tc) && 1639 (priv->tx_tc != SXGBE_MTL_SFMODE) && 1640 (priv->tx_tc < 512))) { 1641 /* step of TX TC is 32 till 128, otherwise 64 */ 1642 priv->tx_tc += (priv->tx_tc < 128) ? 32 : 64; 1643 priv->hw->mtl->set_tx_mtl_mode(priv->ioaddr, 1644 txq->queue_no, priv->tx_tc); 1645 priv->xstats.tx_threshold = priv->tx_tc; 1646 } 1647 1648 return IRQ_HANDLED; 1649 } 1650 1651 /** 1652 * sxgbe_rx_interrupt - RX DMA ISR 1653 * @irq: interrupt number. 1654 * @dev_id: to pass the net device pointer. 1655 * Description: this is the rx dma interrupt service routine. 1656 */ 1657 static irqreturn_t sxgbe_rx_interrupt(int irq, void *dev_id) 1658 { 1659 int status; 1660 struct sxgbe_rx_queue *rxq = (struct sxgbe_rx_queue *)dev_id; 1661 struct sxgbe_priv_data *priv = rxq->priv_ptr; 1662 1663 /* get the channel status */ 1664 status = priv->hw->dma->rx_dma_int_status(priv->ioaddr, rxq->queue_no, 1665 &priv->xstats); 1666 1667 if (likely((status & handle_rx) && (napi_schedule_prep(&priv->napi)))) { 1668 priv->hw->dma->disable_dma_irq(priv->ioaddr, rxq->queue_no); 1669 __napi_schedule(&priv->napi); 1670 } 1671 1672 /* check for TC configuration change */ 1673 if (unlikely((status & rx_bump_tc) && 1674 (priv->rx_tc != SXGBE_MTL_SFMODE) && 1675 (priv->rx_tc < 128))) { 1676 /* step of TC is 32 */ 1677 priv->rx_tc += 32; 1678 priv->hw->mtl->set_rx_mtl_mode(priv->ioaddr, 1679 rxq->queue_no, priv->rx_tc); 1680 priv->xstats.rx_threshold = priv->rx_tc; 1681 } 1682 1683 return IRQ_HANDLED; 1684 } 1685 1686 static inline u64 sxgbe_get_stat64(void __iomem *ioaddr, int reg_lo, int reg_hi) 1687 { 1688 u64 val = readl(ioaddr + reg_lo); 1689 1690 val |= ((u64)readl(ioaddr + reg_hi)) << 32; 1691 1692 return val; 1693 } 1694 1695 1696 /* sxgbe_get_stats64 - entry point to see statistical information of device 1697 * @dev : device pointer. 1698 * @stats : pointer to hold all the statistical information of device. 1699 * Description: 1700 * This function is a driver entry point whenever ifconfig command gets 1701 * executed to see device statistics. Statistics are number of 1702 * bytes sent or received, errors occurred etc. 1703 */ 1704 static void sxgbe_get_stats64(struct net_device *dev, 1705 struct rtnl_link_stats64 *stats) 1706 { 1707 struct sxgbe_priv_data *priv = netdev_priv(dev); 1708 void __iomem *ioaddr = priv->ioaddr; 1709 u64 count; 1710 1711 spin_lock(&priv->stats_lock); 1712 /* Freeze the counter registers before reading value otherwise it may 1713 * get updated by hardware while we are reading them 1714 */ 1715 writel(SXGBE_MMC_CTRL_CNT_FRZ, ioaddr + SXGBE_MMC_CTL_REG); 1716 1717 stats->rx_bytes = sxgbe_get_stat64(ioaddr, 1718 SXGBE_MMC_RXOCTETLO_GCNT_REG, 1719 SXGBE_MMC_RXOCTETHI_GCNT_REG); 1720 1721 stats->rx_packets = sxgbe_get_stat64(ioaddr, 1722 SXGBE_MMC_RXFRAMELO_GBCNT_REG, 1723 SXGBE_MMC_RXFRAMEHI_GBCNT_REG); 1724 1725 stats->multicast = sxgbe_get_stat64(ioaddr, 1726 SXGBE_MMC_RXMULTILO_GCNT_REG, 1727 SXGBE_MMC_RXMULTIHI_GCNT_REG); 1728 1729 stats->rx_crc_errors = sxgbe_get_stat64(ioaddr, 1730 SXGBE_MMC_RXCRCERRLO_REG, 1731 SXGBE_MMC_RXCRCERRHI_REG); 1732 1733 stats->rx_length_errors = sxgbe_get_stat64(ioaddr, 1734 SXGBE_MMC_RXLENERRLO_REG, 1735 SXGBE_MMC_RXLENERRHI_REG); 1736 1737 stats->rx_missed_errors = sxgbe_get_stat64(ioaddr, 1738 SXGBE_MMC_RXFIFOOVERFLOWLO_GBCNT_REG, 1739 SXGBE_MMC_RXFIFOOVERFLOWHI_GBCNT_REG); 1740 1741 stats->tx_bytes = sxgbe_get_stat64(ioaddr, 1742 SXGBE_MMC_TXOCTETLO_GCNT_REG, 1743 SXGBE_MMC_TXOCTETHI_GCNT_REG); 1744 1745 count = sxgbe_get_stat64(ioaddr, SXGBE_MMC_TXFRAMELO_GBCNT_REG, 1746 SXGBE_MMC_TXFRAMEHI_GBCNT_REG); 1747 1748 stats->tx_errors = sxgbe_get_stat64(ioaddr, SXGBE_MMC_TXFRAMELO_GCNT_REG, 1749 SXGBE_MMC_TXFRAMEHI_GCNT_REG); 1750 stats->tx_errors = count - stats->tx_errors; 1751 stats->tx_packets = count; 1752 stats->tx_fifo_errors = sxgbe_get_stat64(ioaddr, SXGBE_MMC_TXUFLWLO_GBCNT_REG, 1753 SXGBE_MMC_TXUFLWHI_GBCNT_REG); 1754 writel(0, ioaddr + SXGBE_MMC_CTL_REG); 1755 spin_unlock(&priv->stats_lock); 1756 } 1757 1758 /* sxgbe_set_features - entry point to set offload features of the device. 1759 * @dev : device pointer. 1760 * @features : features which are required to be set. 1761 * Description: 1762 * This function is a driver entry point and called by Linux kernel whenever 1763 * any device features are set or reset by user. 1764 * Return value: 1765 * This function returns 0 after setting or resetting device features. 1766 */ 1767 static int sxgbe_set_features(struct net_device *dev, 1768 netdev_features_t features) 1769 { 1770 struct sxgbe_priv_data *priv = netdev_priv(dev); 1771 netdev_features_t changed = dev->features ^ features; 1772 1773 if (changed & NETIF_F_RXCSUM) { 1774 if (features & NETIF_F_RXCSUM) { 1775 priv->hw->mac->enable_rx_csum(priv->ioaddr); 1776 priv->rxcsum_insertion = true; 1777 } else { 1778 priv->hw->mac->disable_rx_csum(priv->ioaddr); 1779 priv->rxcsum_insertion = false; 1780 } 1781 } 1782 1783 return 0; 1784 } 1785 1786 /* sxgbe_change_mtu - entry point to change MTU size for the device. 1787 * @dev : device pointer. 1788 * @new_mtu : the new MTU size for the device. 1789 * Description: the Maximum Transfer Unit (MTU) is used by the network layer 1790 * to drive packet transmission. Ethernet has an MTU of 1500 octets 1791 * (ETH_DATA_LEN). This value can be changed with ifconfig. 1792 * Return value: 1793 * 0 on success and an appropriate (-)ve integer as defined in errno.h 1794 * file on failure. 1795 */ 1796 static int sxgbe_change_mtu(struct net_device *dev, int new_mtu) 1797 { 1798 dev->mtu = new_mtu; 1799 1800 if (!netif_running(dev)) 1801 return 0; 1802 1803 /* Recevice ring buffer size is needed to be set based on MTU. If MTU is 1804 * changed then reinitilisation of the receive ring buffers need to be 1805 * done. Hence bring interface down and bring interface back up 1806 */ 1807 sxgbe_release(dev); 1808 return sxgbe_open(dev); 1809 } 1810 1811 static void sxgbe_set_umac_addr(void __iomem *ioaddr, unsigned char *addr, 1812 unsigned int reg_n) 1813 { 1814 unsigned long data; 1815 1816 data = (addr[5] << 8) | addr[4]; 1817 /* For MAC Addr registers se have to set the Address Enable (AE) 1818 * bit that has no effect on the High Reg 0 where the bit 31 (MO) 1819 * is RO. 1820 */ 1821 writel(data | SXGBE_HI_REG_AE, ioaddr + SXGBE_ADDR_HIGH(reg_n)); 1822 data = (addr[3] << 24) | (addr[2] << 16) | (addr[1] << 8) | addr[0]; 1823 writel(data, ioaddr + SXGBE_ADDR_LOW(reg_n)); 1824 } 1825 1826 /** 1827 * sxgbe_set_rx_mode - entry point for setting different receive mode of 1828 * a device. unicast, multicast addressing 1829 * @dev : pointer to the device structure 1830 * Description: 1831 * This function is a driver entry point which gets called by the kernel 1832 * whenever different receive mode like unicast, multicast and promiscuous 1833 * must be enabled/disabled. 1834 * Return value: 1835 * void. 1836 */ 1837 static void sxgbe_set_rx_mode(struct net_device *dev) 1838 { 1839 struct sxgbe_priv_data *priv = netdev_priv(dev); 1840 void __iomem *ioaddr = (void __iomem *)priv->ioaddr; 1841 unsigned int value = 0; 1842 u32 mc_filter[2]; 1843 struct netdev_hw_addr *ha; 1844 int reg = 1; 1845 1846 netdev_dbg(dev, "%s: # mcasts %d, # unicast %d\n", 1847 __func__, netdev_mc_count(dev), netdev_uc_count(dev)); 1848 1849 if (dev->flags & IFF_PROMISC) { 1850 value = SXGBE_FRAME_FILTER_PR; 1851 1852 } else if ((netdev_mc_count(dev) > SXGBE_HASH_TABLE_SIZE) || 1853 (dev->flags & IFF_ALLMULTI)) { 1854 value = SXGBE_FRAME_FILTER_PM; /* pass all multi */ 1855 writel(0xffffffff, ioaddr + SXGBE_HASH_HIGH); 1856 writel(0xffffffff, ioaddr + SXGBE_HASH_LOW); 1857 1858 } else if (!netdev_mc_empty(dev)) { 1859 /* Hash filter for multicast */ 1860 value = SXGBE_FRAME_FILTER_HMC; 1861 1862 memset(mc_filter, 0, sizeof(mc_filter)); 1863 netdev_for_each_mc_addr(ha, dev) { 1864 /* The upper 6 bits of the calculated CRC are used to 1865 * index the contens of the hash table 1866 */ 1867 int bit_nr = bitrev32(~crc32_le(~0, ha->addr, 6)) >> 26; 1868 1869 /* The most significant bit determines the register to 1870 * use (H/L) while the other 5 bits determine the bit 1871 * within the register. 1872 */ 1873 mc_filter[bit_nr >> 5] |= 1 << (bit_nr & 31); 1874 } 1875 writel(mc_filter[0], ioaddr + SXGBE_HASH_LOW); 1876 writel(mc_filter[1], ioaddr + SXGBE_HASH_HIGH); 1877 } 1878 1879 /* Handle multiple unicast addresses (perfect filtering) */ 1880 if (netdev_uc_count(dev) > SXGBE_MAX_PERFECT_ADDRESSES) 1881 /* Switch to promiscuous mode if more than 16 addrs 1882 * are required 1883 */ 1884 value |= SXGBE_FRAME_FILTER_PR; 1885 else { 1886 netdev_for_each_uc_addr(ha, dev) { 1887 sxgbe_set_umac_addr(ioaddr, ha->addr, reg); 1888 reg++; 1889 } 1890 } 1891 #ifdef FRAME_FILTER_DEBUG 1892 /* Enable Receive all mode (to debug filtering_fail errors) */ 1893 value |= SXGBE_FRAME_FILTER_RA; 1894 #endif 1895 writel(value, ioaddr + SXGBE_FRAME_FILTER); 1896 1897 netdev_dbg(dev, "Filter: 0x%08x\n\tHash: HI 0x%08x, LO 0x%08x\n", 1898 readl(ioaddr + SXGBE_FRAME_FILTER), 1899 readl(ioaddr + SXGBE_HASH_HIGH), 1900 readl(ioaddr + SXGBE_HASH_LOW)); 1901 } 1902 1903 #ifdef CONFIG_NET_POLL_CONTROLLER 1904 /** 1905 * sxgbe_poll_controller - entry point for polling receive by device 1906 * @dev : pointer to the device structure 1907 * Description: 1908 * This function is used by NETCONSOLE and other diagnostic tools 1909 * to allow network I/O with interrupts disabled. 1910 * Return value: 1911 * Void. 1912 */ 1913 static void sxgbe_poll_controller(struct net_device *dev) 1914 { 1915 struct sxgbe_priv_data *priv = netdev_priv(dev); 1916 1917 disable_irq(priv->irq); 1918 sxgbe_rx_interrupt(priv->irq, dev); 1919 enable_irq(priv->irq); 1920 } 1921 #endif 1922 1923 /* sxgbe_ioctl - Entry point for the Ioctl 1924 * @dev: Device pointer. 1925 * @rq: An IOCTL specefic structure, that can contain a pointer to 1926 * a proprietary structure used to pass information to the driver. 1927 * @cmd: IOCTL command 1928 * Description: 1929 * Currently it supports the phy_mii_ioctl(...) and HW time stamping. 1930 */ 1931 static int sxgbe_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 1932 { 1933 int ret = -EOPNOTSUPP; 1934 1935 if (!netif_running(dev)) 1936 return -EINVAL; 1937 1938 switch (cmd) { 1939 case SIOCGMIIPHY: 1940 case SIOCGMIIREG: 1941 case SIOCSMIIREG: 1942 if (!dev->phydev) 1943 return -EINVAL; 1944 ret = phy_mii_ioctl(dev->phydev, rq, cmd); 1945 break; 1946 default: 1947 break; 1948 } 1949 1950 return ret; 1951 } 1952 1953 static const struct net_device_ops sxgbe_netdev_ops = { 1954 .ndo_open = sxgbe_open, 1955 .ndo_start_xmit = sxgbe_xmit, 1956 .ndo_stop = sxgbe_release, 1957 .ndo_get_stats64 = sxgbe_get_stats64, 1958 .ndo_change_mtu = sxgbe_change_mtu, 1959 .ndo_set_features = sxgbe_set_features, 1960 .ndo_set_rx_mode = sxgbe_set_rx_mode, 1961 .ndo_tx_timeout = sxgbe_tx_timeout, 1962 .ndo_do_ioctl = sxgbe_ioctl, 1963 #ifdef CONFIG_NET_POLL_CONTROLLER 1964 .ndo_poll_controller = sxgbe_poll_controller, 1965 #endif 1966 .ndo_set_mac_address = eth_mac_addr, 1967 }; 1968 1969 /* Get the hardware ops */ 1970 static void sxgbe_get_ops(struct sxgbe_ops * const ops_ptr) 1971 { 1972 ops_ptr->mac = sxgbe_get_core_ops(); 1973 ops_ptr->desc = sxgbe_get_desc_ops(); 1974 ops_ptr->dma = sxgbe_get_dma_ops(); 1975 ops_ptr->mtl = sxgbe_get_mtl_ops(); 1976 1977 /* set the MDIO communication Address/Data regisers */ 1978 ops_ptr->mii.addr = SXGBE_MDIO_SCMD_ADD_REG; 1979 ops_ptr->mii.data = SXGBE_MDIO_SCMD_DATA_REG; 1980 1981 /* Assigning the default link settings 1982 * no SXGBE defined default values to be set in registers, 1983 * so assigning as 0 for port and duplex 1984 */ 1985 ops_ptr->link.port = 0; 1986 ops_ptr->link.duplex = 0; 1987 ops_ptr->link.speed = SXGBE_SPEED_10G; 1988 } 1989 1990 /** 1991 * sxgbe_hw_init - Init the GMAC device 1992 * @priv: driver private structure 1993 * Description: this function checks the HW capability 1994 * (if supported) and sets the driver's features. 1995 */ 1996 static int sxgbe_hw_init(struct sxgbe_priv_data * const priv) 1997 { 1998 u32 ctrl_ids; 1999 2000 priv->hw = kmalloc(sizeof(*priv->hw), GFP_KERNEL); 2001 if(!priv->hw) 2002 return -ENOMEM; 2003 2004 /* get the hardware ops */ 2005 sxgbe_get_ops(priv->hw); 2006 2007 /* get the controller id */ 2008 ctrl_ids = priv->hw->mac->get_controller_version(priv->ioaddr); 2009 priv->hw->ctrl_uid = (ctrl_ids & 0x00ff0000) >> 16; 2010 priv->hw->ctrl_id = (ctrl_ids & 0x000000ff); 2011 pr_info("user ID: 0x%x, Controller ID: 0x%x\n", 2012 priv->hw->ctrl_uid, priv->hw->ctrl_id); 2013 2014 /* get the H/W features */ 2015 if (!sxgbe_get_hw_features(priv)) 2016 pr_info("Hardware features not found\n"); 2017 2018 if (priv->hw_cap.tx_csum_offload) 2019 pr_info("TX Checksum offload supported\n"); 2020 2021 if (priv->hw_cap.rx_csum_offload) 2022 pr_info("RX Checksum offload supported\n"); 2023 2024 return 0; 2025 } 2026 2027 static int sxgbe_sw_reset(void __iomem *addr) 2028 { 2029 int retry_count = 10; 2030 2031 writel(SXGBE_DMA_SOFT_RESET, addr + SXGBE_DMA_MODE_REG); 2032 while (retry_count--) { 2033 if (!(readl(addr + SXGBE_DMA_MODE_REG) & 2034 SXGBE_DMA_SOFT_RESET)) 2035 break; 2036 mdelay(10); 2037 } 2038 2039 if (retry_count < 0) 2040 return -EBUSY; 2041 2042 return 0; 2043 } 2044 2045 /** 2046 * sxgbe_drv_probe 2047 * @device: device pointer 2048 * @plat_dat: platform data pointer 2049 * @addr: iobase memory address 2050 * Description: this is the main probe function used to 2051 * call the alloc_etherdev, allocate the priv structure. 2052 */ 2053 struct sxgbe_priv_data *sxgbe_drv_probe(struct device *device, 2054 struct sxgbe_plat_data *plat_dat, 2055 void __iomem *addr) 2056 { 2057 struct sxgbe_priv_data *priv; 2058 struct net_device *ndev; 2059 int ret; 2060 u8 queue_num; 2061 2062 ndev = alloc_etherdev_mqs(sizeof(struct sxgbe_priv_data), 2063 SXGBE_TX_QUEUES, SXGBE_RX_QUEUES); 2064 if (!ndev) 2065 return NULL; 2066 2067 SET_NETDEV_DEV(ndev, device); 2068 2069 priv = netdev_priv(ndev); 2070 priv->device = device; 2071 priv->dev = ndev; 2072 2073 sxgbe_set_ethtool_ops(ndev); 2074 priv->plat = plat_dat; 2075 priv->ioaddr = addr; 2076 2077 ret = sxgbe_sw_reset(priv->ioaddr); 2078 if (ret) 2079 goto error_free_netdev; 2080 2081 /* Verify driver arguments */ 2082 sxgbe_verify_args(); 2083 2084 /* Init MAC and get the capabilities */ 2085 ret = sxgbe_hw_init(priv); 2086 if (ret) 2087 goto error_free_netdev; 2088 2089 /* allocate memory resources for Descriptor rings */ 2090 ret = txring_mem_alloc(priv); 2091 if (ret) 2092 goto error_free_hw; 2093 2094 ret = rxring_mem_alloc(priv); 2095 if (ret) 2096 goto error_free_hw; 2097 2098 ndev->netdev_ops = &sxgbe_netdev_ops; 2099 2100 ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | 2101 NETIF_F_RXCSUM | NETIF_F_TSO | NETIF_F_TSO6 | 2102 NETIF_F_GRO; 2103 ndev->features |= ndev->hw_features | NETIF_F_HIGHDMA; 2104 ndev->watchdog_timeo = msecs_to_jiffies(TX_TIMEO); 2105 2106 /* assign filtering support */ 2107 ndev->priv_flags |= IFF_UNICAST_FLT; 2108 2109 /* MTU range: 68 - 9000 */ 2110 ndev->min_mtu = MIN_MTU; 2111 ndev->max_mtu = MAX_MTU; 2112 2113 priv->msg_enable = netif_msg_init(debug, default_msg_level); 2114 2115 /* Enable TCP segmentation offload for all DMA channels */ 2116 if (priv->hw_cap.tcpseg_offload) { 2117 SXGBE_FOR_EACH_QUEUE(SXGBE_TX_QUEUES, queue_num) { 2118 priv->hw->dma->enable_tso(priv->ioaddr, queue_num); 2119 } 2120 } 2121 2122 /* Enable Rx checksum offload */ 2123 if (priv->hw_cap.rx_csum_offload) { 2124 priv->hw->mac->enable_rx_csum(priv->ioaddr); 2125 priv->rxcsum_insertion = true; 2126 } 2127 2128 /* Initialise pause frame settings */ 2129 priv->rx_pause = 1; 2130 priv->tx_pause = 1; 2131 2132 /* Rx Watchdog is available, enable depend on platform data */ 2133 if (!priv->plat->riwt_off) { 2134 priv->use_riwt = 1; 2135 pr_info("Enable RX Mitigation via HW Watchdog Timer\n"); 2136 } 2137 2138 netif_napi_add(ndev, &priv->napi, sxgbe_poll, 64); 2139 2140 spin_lock_init(&priv->stats_lock); 2141 2142 priv->sxgbe_clk = clk_get(priv->device, SXGBE_RESOURCE_NAME); 2143 if (IS_ERR(priv->sxgbe_clk)) { 2144 netdev_warn(ndev, "%s: warning: cannot get CSR clock\n", 2145 __func__); 2146 goto error_napi_del; 2147 } 2148 2149 /* If a specific clk_csr value is passed from the platform 2150 * this means that the CSR Clock Range selection cannot be 2151 * changed at run-time and it is fixed. Viceversa the driver'll try to 2152 * set the MDC clock dynamically according to the csr actual 2153 * clock input. 2154 */ 2155 if (!priv->plat->clk_csr) 2156 sxgbe_clk_csr_set(priv); 2157 else 2158 priv->clk_csr = priv->plat->clk_csr; 2159 2160 /* MDIO bus Registration */ 2161 ret = sxgbe_mdio_register(ndev); 2162 if (ret < 0) { 2163 netdev_dbg(ndev, "%s: MDIO bus (id: %d) registration failed\n", 2164 __func__, priv->plat->bus_id); 2165 goto error_clk_put; 2166 } 2167 2168 ret = register_netdev(ndev); 2169 if (ret) { 2170 pr_err("%s: ERROR %i registering the device\n", __func__, ret); 2171 goto error_mdio_unregister; 2172 } 2173 2174 sxgbe_check_ether_addr(priv); 2175 2176 return priv; 2177 2178 error_mdio_unregister: 2179 sxgbe_mdio_unregister(ndev); 2180 error_clk_put: 2181 clk_put(priv->sxgbe_clk); 2182 error_napi_del: 2183 netif_napi_del(&priv->napi); 2184 error_free_hw: 2185 kfree(priv->hw); 2186 error_free_netdev: 2187 free_netdev(ndev); 2188 2189 return NULL; 2190 } 2191 2192 /** 2193 * sxgbe_drv_remove 2194 * @ndev: net device pointer 2195 * Description: this function resets the TX/RX processes, disables the MAC RX/TX 2196 * changes the link status, releases the DMA descriptor rings. 2197 */ 2198 int sxgbe_drv_remove(struct net_device *ndev) 2199 { 2200 struct sxgbe_priv_data *priv = netdev_priv(ndev); 2201 u8 queue_num; 2202 2203 netdev_info(ndev, "%s: removing driver\n", __func__); 2204 2205 SXGBE_FOR_EACH_QUEUE(SXGBE_RX_QUEUES, queue_num) { 2206 priv->hw->mac->disable_rxqueue(priv->ioaddr, queue_num); 2207 } 2208 2209 priv->hw->dma->stop_rx(priv->ioaddr, SXGBE_RX_QUEUES); 2210 priv->hw->dma->stop_tx(priv->ioaddr, SXGBE_TX_QUEUES); 2211 2212 priv->hw->mac->enable_tx(priv->ioaddr, false); 2213 priv->hw->mac->enable_rx(priv->ioaddr, false); 2214 2215 unregister_netdev(ndev); 2216 2217 sxgbe_mdio_unregister(ndev); 2218 2219 clk_put(priv->sxgbe_clk); 2220 2221 netif_napi_del(&priv->napi); 2222 2223 kfree(priv->hw); 2224 2225 free_netdev(ndev); 2226 2227 return 0; 2228 } 2229 2230 #ifdef CONFIG_PM 2231 int sxgbe_suspend(struct net_device *ndev) 2232 { 2233 return 0; 2234 } 2235 2236 int sxgbe_resume(struct net_device *ndev) 2237 { 2238 return 0; 2239 } 2240 2241 int sxgbe_freeze(struct net_device *ndev) 2242 { 2243 return -ENOSYS; 2244 } 2245 2246 int sxgbe_restore(struct net_device *ndev) 2247 { 2248 return -ENOSYS; 2249 } 2250 #endif /* CONFIG_PM */ 2251 2252 /* Driver is configured as Platform driver */ 2253 static int __init sxgbe_init(void) 2254 { 2255 int ret; 2256 2257 ret = sxgbe_register_platform(); 2258 if (ret) 2259 goto err; 2260 return 0; 2261 err: 2262 pr_err("driver registration failed\n"); 2263 return ret; 2264 } 2265 2266 static void __exit sxgbe_exit(void) 2267 { 2268 sxgbe_unregister_platform(); 2269 } 2270 2271 module_init(sxgbe_init); 2272 module_exit(sxgbe_exit); 2273 2274 #ifndef MODULE 2275 static int __init sxgbe_cmdline_opt(char *str) 2276 { 2277 char *opt; 2278 2279 if (!str || !*str) 2280 return -EINVAL; 2281 while ((opt = strsep(&str, ",")) != NULL) { 2282 if (!strncmp(opt, "eee_timer:", 6)) { 2283 if (kstrtoint(opt + 10, 0, &eee_timer)) 2284 goto err; 2285 } 2286 } 2287 return 0; 2288 2289 err: 2290 pr_err("%s: ERROR broken module parameter conversion\n", __func__); 2291 return -EINVAL; 2292 } 2293 2294 __setup("sxgbeeth=", sxgbe_cmdline_opt); 2295 #endif /* MODULE */ 2296 2297 2298 2299 MODULE_DESCRIPTION("SAMSUNG 10G/2.5G/1G Ethernet PLATFORM driver"); 2300 2301 MODULE_PARM_DESC(debug, "Message Level (-1: default, 0: no output, 16: all)"); 2302 MODULE_PARM_DESC(eee_timer, "EEE-LPI Default LS timer value"); 2303 2304 MODULE_AUTHOR("Siva Reddy Kallam <siva.kallam@samsung.com>"); 2305 MODULE_AUTHOR("ByungHo An <bh74.an@samsung.com>"); 2306 MODULE_AUTHOR("Girish K S <ks.giri@samsung.com>"); 2307 MODULE_AUTHOR("Vipul Pandya <vipul.pandya@samsung.com>"); 2308 2309 MODULE_LICENSE("GPL"); 2310