1 /* 2 * Driver for the MPC5200 Fast Ethernet Controller 3 * 4 * Originally written by Dale Farnsworth <dfarnsworth@mvista.com> and 5 * now maintained by Sylvain Munaut <tnt@246tNt.com> 6 * 7 * Copyright (C) 2007 Domen Puncer, Telargo, Inc. 8 * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com> 9 * Copyright (C) 2003-2004 MontaVista, Software, Inc. 10 * 11 * This file is licensed under the terms of the GNU General Public License 12 * version 2. This program is licensed "as is" without any warranty of any 13 * kind, whether express or implied. 14 * 15 */ 16 17 #include <linux/dma-mapping.h> 18 #include <linux/module.h> 19 20 #include <linux/kernel.h> 21 #include <linux/types.h> 22 #include <linux/spinlock.h> 23 #include <linux/slab.h> 24 #include <linux/errno.h> 25 #include <linux/init.h> 26 #include <linux/interrupt.h> 27 #include <linux/crc32.h> 28 #include <linux/hardirq.h> 29 #include <linux/delay.h> 30 #include <linux/of_device.h> 31 #include <linux/of_mdio.h> 32 #include <linux/of_net.h> 33 #include <linux/of_platform.h> 34 35 #include <linux/netdevice.h> 36 #include <linux/etherdevice.h> 37 #include <linux/ethtool.h> 38 #include <linux/skbuff.h> 39 40 #include <asm/io.h> 41 #include <asm/delay.h> 42 #include <asm/mpc52xx.h> 43 44 #include <linux/fsl/bestcomm/bestcomm.h> 45 #include <linux/fsl/bestcomm/fec.h> 46 47 #include "fec_mpc52xx.h" 48 49 #define DRIVER_NAME "mpc52xx-fec" 50 51 /* Private driver data structure */ 52 struct mpc52xx_fec_priv { 53 struct net_device *ndev; 54 int duplex; 55 int speed; 56 int r_irq; 57 int t_irq; 58 struct mpc52xx_fec __iomem *fec; 59 struct bcom_task *rx_dmatsk; 60 struct bcom_task *tx_dmatsk; 61 spinlock_t lock; 62 int msg_enable; 63 64 /* MDIO link details */ 65 unsigned int mdio_speed; 66 struct device_node *phy_node; 67 struct phy_device *phydev; 68 enum phy_state link; 69 int seven_wire_mode; 70 }; 71 72 73 static irqreturn_t mpc52xx_fec_interrupt(int, void *); 74 static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *); 75 static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *); 76 static void mpc52xx_fec_stop(struct net_device *dev); 77 static void mpc52xx_fec_start(struct net_device *dev); 78 static void mpc52xx_fec_reset(struct net_device *dev); 79 80 #define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \ 81 NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP) 82 static int debug = -1; /* the above default */ 83 module_param(debug, int, 0); 84 MODULE_PARM_DESC(debug, "debugging messages level"); 85 86 static void mpc52xx_fec_tx_timeout(struct net_device *dev) 87 { 88 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 89 unsigned long flags; 90 91 dev_warn(&dev->dev, "transmit timed out\n"); 92 93 spin_lock_irqsave(&priv->lock, flags); 94 mpc52xx_fec_reset(dev); 95 dev->stats.tx_errors++; 96 spin_unlock_irqrestore(&priv->lock, flags); 97 98 netif_wake_queue(dev); 99 } 100 101 static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac) 102 { 103 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 104 struct mpc52xx_fec __iomem *fec = priv->fec; 105 106 out_be32(&fec->paddr1, *(u32 *)(&mac[0])); 107 out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE); 108 } 109 110 static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr) 111 { 112 struct sockaddr *sock = addr; 113 114 memcpy(dev->dev_addr, sock->sa_data, dev->addr_len); 115 116 mpc52xx_fec_set_paddr(dev, sock->sa_data); 117 return 0; 118 } 119 120 static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s) 121 { 122 while (!bcom_queue_empty(s)) { 123 struct bcom_fec_bd *bd; 124 struct sk_buff *skb; 125 126 skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd); 127 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len, 128 DMA_FROM_DEVICE); 129 kfree_skb(skb); 130 } 131 } 132 133 static void 134 mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb) 135 { 136 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 137 struct bcom_fec_bd *bd; 138 139 bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk); 140 bd->status = FEC_RX_BUFFER_SIZE; 141 bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data, 142 FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE); 143 bcom_submit_next_buffer(priv->rx_dmatsk, rskb); 144 } 145 146 static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk) 147 { 148 struct sk_buff *skb; 149 150 while (!bcom_queue_full(rxtsk)) { 151 skb = netdev_alloc_skb(dev, FEC_RX_BUFFER_SIZE); 152 if (!skb) 153 return -EAGAIN; 154 155 /* zero out the initial receive buffers to aid debugging */ 156 memset(skb->data, 0, FEC_RX_BUFFER_SIZE); 157 mpc52xx_fec_rx_submit(dev, skb); 158 } 159 return 0; 160 } 161 162 /* based on generic_adjust_link from fs_enet-main.c */ 163 static void mpc52xx_fec_adjust_link(struct net_device *dev) 164 { 165 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 166 struct phy_device *phydev = priv->phydev; 167 int new_state = 0; 168 169 if (phydev->link != PHY_DOWN) { 170 if (phydev->duplex != priv->duplex) { 171 struct mpc52xx_fec __iomem *fec = priv->fec; 172 u32 rcntrl; 173 u32 tcntrl; 174 175 new_state = 1; 176 priv->duplex = phydev->duplex; 177 178 rcntrl = in_be32(&fec->r_cntrl); 179 tcntrl = in_be32(&fec->x_cntrl); 180 181 rcntrl &= ~FEC_RCNTRL_DRT; 182 tcntrl &= ~FEC_TCNTRL_FDEN; 183 if (phydev->duplex == DUPLEX_FULL) 184 tcntrl |= FEC_TCNTRL_FDEN; /* FD enable */ 185 else 186 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */ 187 188 out_be32(&fec->r_cntrl, rcntrl); 189 out_be32(&fec->x_cntrl, tcntrl); 190 } 191 192 if (phydev->speed != priv->speed) { 193 new_state = 1; 194 priv->speed = phydev->speed; 195 } 196 197 if (priv->link == PHY_DOWN) { 198 new_state = 1; 199 priv->link = phydev->link; 200 } 201 202 } else if (priv->link) { 203 new_state = 1; 204 priv->link = PHY_DOWN; 205 priv->speed = 0; 206 priv->duplex = -1; 207 } 208 209 if (new_state && netif_msg_link(priv)) 210 phy_print_status(phydev); 211 } 212 213 static int mpc52xx_fec_open(struct net_device *dev) 214 { 215 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 216 int err = -EBUSY; 217 218 if (priv->phy_node) { 219 priv->phydev = of_phy_connect(priv->ndev, priv->phy_node, 220 mpc52xx_fec_adjust_link, 0, 0); 221 if (!priv->phydev) { 222 dev_err(&dev->dev, "of_phy_connect failed\n"); 223 return -ENODEV; 224 } 225 phy_start(priv->phydev); 226 } 227 228 if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED, 229 DRIVER_NAME "_ctrl", dev)) { 230 dev_err(&dev->dev, "ctrl interrupt request failed\n"); 231 goto free_phy; 232 } 233 if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0, 234 DRIVER_NAME "_rx", dev)) { 235 dev_err(&dev->dev, "rx interrupt request failed\n"); 236 goto free_ctrl_irq; 237 } 238 if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0, 239 DRIVER_NAME "_tx", dev)) { 240 dev_err(&dev->dev, "tx interrupt request failed\n"); 241 goto free_2irqs; 242 } 243 244 bcom_fec_rx_reset(priv->rx_dmatsk); 245 bcom_fec_tx_reset(priv->tx_dmatsk); 246 247 err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk); 248 if (err) { 249 dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n"); 250 goto free_irqs; 251 } 252 253 bcom_enable(priv->rx_dmatsk); 254 bcom_enable(priv->tx_dmatsk); 255 256 mpc52xx_fec_start(dev); 257 258 netif_start_queue(dev); 259 260 return 0; 261 262 free_irqs: 263 free_irq(priv->t_irq, dev); 264 free_2irqs: 265 free_irq(priv->r_irq, dev); 266 free_ctrl_irq: 267 free_irq(dev->irq, dev); 268 free_phy: 269 if (priv->phydev) { 270 phy_stop(priv->phydev); 271 phy_disconnect(priv->phydev); 272 priv->phydev = NULL; 273 } 274 275 return err; 276 } 277 278 static int mpc52xx_fec_close(struct net_device *dev) 279 { 280 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 281 282 netif_stop_queue(dev); 283 284 mpc52xx_fec_stop(dev); 285 286 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk); 287 288 free_irq(dev->irq, dev); 289 free_irq(priv->r_irq, dev); 290 free_irq(priv->t_irq, dev); 291 292 if (priv->phydev) { 293 /* power down phy */ 294 phy_stop(priv->phydev); 295 phy_disconnect(priv->phydev); 296 priv->phydev = NULL; 297 } 298 299 return 0; 300 } 301 302 /* This will only be invoked if your driver is _not_ in XOFF state. 303 * What this means is that you need not check it, and that this 304 * invariant will hold if you make sure that the netif_*_queue() 305 * calls are done at the proper times. 306 */ 307 static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev) 308 { 309 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 310 struct bcom_fec_bd *bd; 311 unsigned long flags; 312 313 if (bcom_queue_full(priv->tx_dmatsk)) { 314 if (net_ratelimit()) 315 dev_err(&dev->dev, "transmit queue overrun\n"); 316 return NETDEV_TX_BUSY; 317 } 318 319 spin_lock_irqsave(&priv->lock, flags); 320 321 bd = (struct bcom_fec_bd *) 322 bcom_prepare_next_buffer(priv->tx_dmatsk); 323 324 bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC; 325 bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len, 326 DMA_TO_DEVICE); 327 328 skb_tx_timestamp(skb); 329 bcom_submit_next_buffer(priv->tx_dmatsk, skb); 330 spin_unlock_irqrestore(&priv->lock, flags); 331 332 if (bcom_queue_full(priv->tx_dmatsk)) { 333 netif_stop_queue(dev); 334 } 335 336 return NETDEV_TX_OK; 337 } 338 339 #ifdef CONFIG_NET_POLL_CONTROLLER 340 static void mpc52xx_fec_poll_controller(struct net_device *dev) 341 { 342 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 343 344 disable_irq(priv->t_irq); 345 mpc52xx_fec_tx_interrupt(priv->t_irq, dev); 346 enable_irq(priv->t_irq); 347 disable_irq(priv->r_irq); 348 mpc52xx_fec_rx_interrupt(priv->r_irq, dev); 349 enable_irq(priv->r_irq); 350 } 351 #endif 352 353 354 /* This handles BestComm transmit task interrupts 355 */ 356 static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id) 357 { 358 struct net_device *dev = dev_id; 359 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 360 361 spin_lock(&priv->lock); 362 while (bcom_buffer_done(priv->tx_dmatsk)) { 363 struct sk_buff *skb; 364 struct bcom_fec_bd *bd; 365 skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL, 366 (struct bcom_bd **)&bd); 367 dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len, 368 DMA_TO_DEVICE); 369 370 dev_kfree_skb_irq(skb); 371 } 372 spin_unlock(&priv->lock); 373 374 netif_wake_queue(dev); 375 376 return IRQ_HANDLED; 377 } 378 379 static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id) 380 { 381 struct net_device *dev = dev_id; 382 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 383 struct sk_buff *rskb; /* received sk_buff */ 384 struct sk_buff *skb; /* new sk_buff to enqueue in its place */ 385 struct bcom_fec_bd *bd; 386 u32 status, physaddr; 387 int length; 388 389 spin_lock(&priv->lock); 390 391 while (bcom_buffer_done(priv->rx_dmatsk)) { 392 393 rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status, 394 (struct bcom_bd **)&bd); 395 physaddr = bd->skb_pa; 396 397 /* Test for errors in received frame */ 398 if (status & BCOM_FEC_RX_BD_ERRORS) { 399 /* Drop packet and reuse the buffer */ 400 mpc52xx_fec_rx_submit(dev, rskb); 401 dev->stats.rx_dropped++; 402 continue; 403 } 404 405 /* skbs are allocated on open, so now we allocate a new one, 406 * and remove the old (with the packet) */ 407 skb = netdev_alloc_skb(dev, FEC_RX_BUFFER_SIZE); 408 if (!skb) { 409 /* Can't get a new one : reuse the same & drop pkt */ 410 dev_notice(&dev->dev, "Low memory - dropped packet.\n"); 411 mpc52xx_fec_rx_submit(dev, rskb); 412 dev->stats.rx_dropped++; 413 continue; 414 } 415 416 /* Enqueue the new sk_buff back on the hardware */ 417 mpc52xx_fec_rx_submit(dev, skb); 418 419 /* Process the received skb - Drop the spin lock while 420 * calling into the network stack */ 421 spin_unlock(&priv->lock); 422 423 dma_unmap_single(dev->dev.parent, physaddr, rskb->len, 424 DMA_FROM_DEVICE); 425 length = status & BCOM_FEC_RX_BD_LEN_MASK; 426 skb_put(rskb, length - 4); /* length without CRC32 */ 427 rskb->protocol = eth_type_trans(rskb, dev); 428 if (!skb_defer_rx_timestamp(rskb)) 429 netif_rx(rskb); 430 431 spin_lock(&priv->lock); 432 } 433 434 spin_unlock(&priv->lock); 435 436 return IRQ_HANDLED; 437 } 438 439 static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id) 440 { 441 struct net_device *dev = dev_id; 442 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 443 struct mpc52xx_fec __iomem *fec = priv->fec; 444 u32 ievent; 445 446 ievent = in_be32(&fec->ievent); 447 448 ievent &= ~FEC_IEVENT_MII; /* mii is handled separately */ 449 if (!ievent) 450 return IRQ_NONE; 451 452 out_be32(&fec->ievent, ievent); /* clear pending events */ 453 454 /* on fifo error, soft-reset fec */ 455 if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) { 456 457 if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR)) 458 dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n"); 459 if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR)) 460 dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n"); 461 462 spin_lock(&priv->lock); 463 mpc52xx_fec_reset(dev); 464 spin_unlock(&priv->lock); 465 466 return IRQ_HANDLED; 467 } 468 469 if (ievent & ~FEC_IEVENT_TFINT) 470 dev_dbg(&dev->dev, "ievent: %08x\n", ievent); 471 472 return IRQ_HANDLED; 473 } 474 475 /* 476 * Get the current statistics. 477 * This may be called with the card open or closed. 478 */ 479 static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev) 480 { 481 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 482 struct net_device_stats *stats = &dev->stats; 483 struct mpc52xx_fec __iomem *fec = priv->fec; 484 485 stats->rx_bytes = in_be32(&fec->rmon_r_octets); 486 stats->rx_packets = in_be32(&fec->rmon_r_packets); 487 stats->rx_errors = in_be32(&fec->rmon_r_crc_align) + 488 in_be32(&fec->rmon_r_undersize) + 489 in_be32(&fec->rmon_r_oversize) + 490 in_be32(&fec->rmon_r_frag) + 491 in_be32(&fec->rmon_r_jab); 492 493 stats->tx_bytes = in_be32(&fec->rmon_t_octets); 494 stats->tx_packets = in_be32(&fec->rmon_t_packets); 495 stats->tx_errors = in_be32(&fec->rmon_t_crc_align) + 496 in_be32(&fec->rmon_t_undersize) + 497 in_be32(&fec->rmon_t_oversize) + 498 in_be32(&fec->rmon_t_frag) + 499 in_be32(&fec->rmon_t_jab); 500 501 stats->multicast = in_be32(&fec->rmon_r_mc_pkt); 502 stats->collisions = in_be32(&fec->rmon_t_col); 503 504 /* detailed rx_errors: */ 505 stats->rx_length_errors = in_be32(&fec->rmon_r_undersize) 506 + in_be32(&fec->rmon_r_oversize) 507 + in_be32(&fec->rmon_r_frag) 508 + in_be32(&fec->rmon_r_jab); 509 stats->rx_over_errors = in_be32(&fec->r_macerr); 510 stats->rx_crc_errors = in_be32(&fec->ieee_r_crc); 511 stats->rx_frame_errors = in_be32(&fec->ieee_r_align); 512 stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop); 513 stats->rx_missed_errors = in_be32(&fec->rmon_r_drop); 514 515 /* detailed tx_errors: */ 516 stats->tx_aborted_errors = 0; 517 stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr); 518 stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop); 519 stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe); 520 stats->tx_window_errors = in_be32(&fec->ieee_t_lcol); 521 522 return stats; 523 } 524 525 /* 526 * Read MIB counters in order to reset them, 527 * then zero all the stats fields in memory 528 */ 529 static void mpc52xx_fec_reset_stats(struct net_device *dev) 530 { 531 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 532 struct mpc52xx_fec __iomem *fec = priv->fec; 533 534 out_be32(&fec->mib_control, FEC_MIB_DISABLE); 535 memset_io(&fec->rmon_t_drop, 0, 536 offsetof(struct mpc52xx_fec, reserved10) - 537 offsetof(struct mpc52xx_fec, rmon_t_drop)); 538 out_be32(&fec->mib_control, 0); 539 540 memset(&dev->stats, 0, sizeof(dev->stats)); 541 } 542 543 /* 544 * Set or clear the multicast filter for this adaptor. 545 */ 546 static void mpc52xx_fec_set_multicast_list(struct net_device *dev) 547 { 548 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 549 struct mpc52xx_fec __iomem *fec = priv->fec; 550 u32 rx_control; 551 552 rx_control = in_be32(&fec->r_cntrl); 553 554 if (dev->flags & IFF_PROMISC) { 555 rx_control |= FEC_RCNTRL_PROM; 556 out_be32(&fec->r_cntrl, rx_control); 557 } else { 558 rx_control &= ~FEC_RCNTRL_PROM; 559 out_be32(&fec->r_cntrl, rx_control); 560 561 if (dev->flags & IFF_ALLMULTI) { 562 out_be32(&fec->gaddr1, 0xffffffff); 563 out_be32(&fec->gaddr2, 0xffffffff); 564 } else { 565 u32 crc; 566 struct netdev_hw_addr *ha; 567 u32 gaddr1 = 0x00000000; 568 u32 gaddr2 = 0x00000000; 569 570 netdev_for_each_mc_addr(ha, dev) { 571 crc = ether_crc_le(6, ha->addr) >> 26; 572 if (crc >= 32) 573 gaddr1 |= 1 << (crc-32); 574 else 575 gaddr2 |= 1 << crc; 576 } 577 out_be32(&fec->gaddr1, gaddr1); 578 out_be32(&fec->gaddr2, gaddr2); 579 } 580 } 581 } 582 583 /** 584 * mpc52xx_fec_hw_init 585 * @dev: network device 586 * 587 * Setup various hardware setting, only needed once on start 588 */ 589 static void mpc52xx_fec_hw_init(struct net_device *dev) 590 { 591 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 592 struct mpc52xx_fec __iomem *fec = priv->fec; 593 int i; 594 595 /* Whack a reset. We should wait for this. */ 596 out_be32(&fec->ecntrl, FEC_ECNTRL_RESET); 597 for (i = 0; i < FEC_RESET_DELAY; ++i) { 598 if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0) 599 break; 600 udelay(1); 601 } 602 if (i == FEC_RESET_DELAY) 603 dev_err(&dev->dev, "FEC Reset timeout!\n"); 604 605 /* set pause to 0x20 frames */ 606 out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20); 607 608 /* high service request will be deasserted when there's < 7 bytes in fifo 609 * low service request will be deasserted when there's < 4*7 bytes in fifo 610 */ 611 out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7); 612 out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7); 613 614 /* alarm when <= x bytes in FIFO */ 615 out_be32(&fec->rfifo_alarm, 0x0000030c); 616 out_be32(&fec->tfifo_alarm, 0x00000100); 617 618 /* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */ 619 out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B); 620 621 /* enable crc generation */ 622 out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC); 623 out_be32(&fec->iaddr1, 0x00000000); /* No individual filter */ 624 out_be32(&fec->iaddr2, 0x00000000); /* No individual filter */ 625 626 /* set phy speed. 627 * this can't be done in phy driver, since it needs to be called 628 * before fec stuff (even on resume) */ 629 out_be32(&fec->mii_speed, priv->mdio_speed); 630 } 631 632 /** 633 * mpc52xx_fec_start 634 * @dev: network device 635 * 636 * This function is called to start or restart the FEC during a link 637 * change. This happens on fifo errors or when switching between half 638 * and full duplex. 639 */ 640 static void mpc52xx_fec_start(struct net_device *dev) 641 { 642 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 643 struct mpc52xx_fec __iomem *fec = priv->fec; 644 u32 rcntrl; 645 u32 tcntrl; 646 u32 tmp; 647 648 /* clear sticky error bits */ 649 tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF; 650 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp); 651 out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp); 652 653 /* FIFOs will reset on mpc52xx_fec_enable */ 654 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET); 655 656 /* Set station address. */ 657 mpc52xx_fec_set_paddr(dev, dev->dev_addr); 658 659 mpc52xx_fec_set_multicast_list(dev); 660 661 /* set max frame len, enable flow control, select mii mode */ 662 rcntrl = FEC_RX_BUFFER_SIZE << 16; /* max frame length */ 663 rcntrl |= FEC_RCNTRL_FCE; 664 665 if (!priv->seven_wire_mode) 666 rcntrl |= FEC_RCNTRL_MII_MODE; 667 668 if (priv->duplex == DUPLEX_FULL) 669 tcntrl = FEC_TCNTRL_FDEN; /* FD enable */ 670 else { 671 rcntrl |= FEC_RCNTRL_DRT; /* disable Rx on Tx (HD) */ 672 tcntrl = 0; 673 } 674 out_be32(&fec->r_cntrl, rcntrl); 675 out_be32(&fec->x_cntrl, tcntrl); 676 677 /* Clear any outstanding interrupt. */ 678 out_be32(&fec->ievent, 0xffffffff); 679 680 /* Enable interrupts we wish to service. */ 681 out_be32(&fec->imask, FEC_IMASK_ENABLE); 682 683 /* And last, enable the transmit and receive processing. */ 684 out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN); 685 out_be32(&fec->r_des_active, 0x01000000); 686 } 687 688 /** 689 * mpc52xx_fec_stop 690 * @dev: network device 691 * 692 * stop all activity on fec and empty dma buffers 693 */ 694 static void mpc52xx_fec_stop(struct net_device *dev) 695 { 696 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 697 struct mpc52xx_fec __iomem *fec = priv->fec; 698 unsigned long timeout; 699 700 /* disable all interrupts */ 701 out_be32(&fec->imask, 0); 702 703 /* Disable the rx task. */ 704 bcom_disable(priv->rx_dmatsk); 705 706 /* Wait for tx queue to drain, but only if we're in process context */ 707 if (!in_interrupt()) { 708 timeout = jiffies + msecs_to_jiffies(2000); 709 while (time_before(jiffies, timeout) && 710 !bcom_queue_empty(priv->tx_dmatsk)) 711 msleep(100); 712 713 if (time_after_eq(jiffies, timeout)) 714 dev_err(&dev->dev, "queues didn't drain\n"); 715 #if 1 716 if (time_after_eq(jiffies, timeout)) { 717 dev_err(&dev->dev, " tx: index: %i, outdex: %i\n", 718 priv->tx_dmatsk->index, 719 priv->tx_dmatsk->outdex); 720 dev_err(&dev->dev, " rx: index: %i, outdex: %i\n", 721 priv->rx_dmatsk->index, 722 priv->rx_dmatsk->outdex); 723 } 724 #endif 725 } 726 727 bcom_disable(priv->tx_dmatsk); 728 729 /* Stop FEC */ 730 out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN); 731 } 732 733 /* reset fec and bestcomm tasks */ 734 static void mpc52xx_fec_reset(struct net_device *dev) 735 { 736 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 737 struct mpc52xx_fec __iomem *fec = priv->fec; 738 739 mpc52xx_fec_stop(dev); 740 741 out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status)); 742 out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO); 743 744 mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk); 745 746 mpc52xx_fec_hw_init(dev); 747 748 bcom_fec_rx_reset(priv->rx_dmatsk); 749 bcom_fec_tx_reset(priv->tx_dmatsk); 750 751 mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk); 752 753 bcom_enable(priv->rx_dmatsk); 754 bcom_enable(priv->tx_dmatsk); 755 756 mpc52xx_fec_start(dev); 757 758 netif_wake_queue(dev); 759 } 760 761 762 /* ethtool interface */ 763 764 static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 765 { 766 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 767 768 if (!priv->phydev) 769 return -ENODEV; 770 771 return phy_ethtool_gset(priv->phydev, cmd); 772 } 773 774 static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd) 775 { 776 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 777 778 if (!priv->phydev) 779 return -ENODEV; 780 781 return phy_ethtool_sset(priv->phydev, cmd); 782 } 783 784 static u32 mpc52xx_fec_get_msglevel(struct net_device *dev) 785 { 786 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 787 return priv->msg_enable; 788 } 789 790 static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level) 791 { 792 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 793 priv->msg_enable = level; 794 } 795 796 static const struct ethtool_ops mpc52xx_fec_ethtool_ops = { 797 .get_settings = mpc52xx_fec_get_settings, 798 .set_settings = mpc52xx_fec_set_settings, 799 .get_link = ethtool_op_get_link, 800 .get_msglevel = mpc52xx_fec_get_msglevel, 801 .set_msglevel = mpc52xx_fec_set_msglevel, 802 .get_ts_info = ethtool_op_get_ts_info, 803 }; 804 805 806 static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd) 807 { 808 struct mpc52xx_fec_priv *priv = netdev_priv(dev); 809 810 if (!priv->phydev) 811 return -ENOTSUPP; 812 813 return phy_mii_ioctl(priv->phydev, rq, cmd); 814 } 815 816 static const struct net_device_ops mpc52xx_fec_netdev_ops = { 817 .ndo_open = mpc52xx_fec_open, 818 .ndo_stop = mpc52xx_fec_close, 819 .ndo_start_xmit = mpc52xx_fec_start_xmit, 820 .ndo_set_rx_mode = mpc52xx_fec_set_multicast_list, 821 .ndo_set_mac_address = mpc52xx_fec_set_mac_address, 822 .ndo_validate_addr = eth_validate_addr, 823 .ndo_do_ioctl = mpc52xx_fec_ioctl, 824 .ndo_change_mtu = eth_change_mtu, 825 .ndo_tx_timeout = mpc52xx_fec_tx_timeout, 826 .ndo_get_stats = mpc52xx_fec_get_stats, 827 #ifdef CONFIG_NET_POLL_CONTROLLER 828 .ndo_poll_controller = mpc52xx_fec_poll_controller, 829 #endif 830 }; 831 832 /* ======================================================================== */ 833 /* OF Driver */ 834 /* ======================================================================== */ 835 836 static int mpc52xx_fec_probe(struct platform_device *op) 837 { 838 int rv; 839 struct net_device *ndev; 840 struct mpc52xx_fec_priv *priv = NULL; 841 struct resource mem; 842 const u32 *prop; 843 int prop_size; 844 struct device_node *np = op->dev.of_node; 845 const char *mac_addr; 846 847 phys_addr_t rx_fifo; 848 phys_addr_t tx_fifo; 849 850 /* Get the ether ndev & it's private zone */ 851 ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv)); 852 if (!ndev) 853 return -ENOMEM; 854 855 priv = netdev_priv(ndev); 856 priv->ndev = ndev; 857 858 /* Reserve FEC control zone */ 859 rv = of_address_to_resource(np, 0, &mem); 860 if (rv) { 861 printk(KERN_ERR DRIVER_NAME ": " 862 "Error while parsing device node resource\n" ); 863 goto err_netdev; 864 } 865 if (resource_size(&mem) < sizeof(struct mpc52xx_fec)) { 866 printk(KERN_ERR DRIVER_NAME 867 " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n", 868 (unsigned long)resource_size(&mem), 869 sizeof(struct mpc52xx_fec)); 870 rv = -EINVAL; 871 goto err_netdev; 872 } 873 874 if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec), 875 DRIVER_NAME)) { 876 rv = -EBUSY; 877 goto err_netdev; 878 } 879 880 /* Init ether ndev with what we have */ 881 ndev->netdev_ops = &mpc52xx_fec_netdev_ops; 882 ndev->ethtool_ops = &mpc52xx_fec_ethtool_ops; 883 ndev->watchdog_timeo = FEC_WATCHDOG_TIMEOUT; 884 ndev->base_addr = mem.start; 885 SET_NETDEV_DEV(ndev, &op->dev); 886 887 spin_lock_init(&priv->lock); 888 889 /* ioremap the zones */ 890 priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec)); 891 892 if (!priv->fec) { 893 rv = -ENOMEM; 894 goto err_mem_region; 895 } 896 897 /* Bestcomm init */ 898 rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data); 899 tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data); 900 901 priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE); 902 priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo); 903 904 if (!priv->rx_dmatsk || !priv->tx_dmatsk) { 905 printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" ); 906 rv = -ENOMEM; 907 goto err_rx_tx_dmatsk; 908 } 909 910 /* Get the IRQ we need one by one */ 911 /* Control */ 912 ndev->irq = irq_of_parse_and_map(np, 0); 913 914 /* RX */ 915 priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk); 916 917 /* TX */ 918 priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk); 919 920 /* 921 * MAC address init: 922 * 923 * First try to read MAC address from DT 924 */ 925 mac_addr = of_get_mac_address(np); 926 if (mac_addr) { 927 memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); 928 } else { 929 struct mpc52xx_fec __iomem *fec = priv->fec; 930 931 /* 932 * If the MAC addresse is not provided via DT then read 933 * it back from the controller regs 934 */ 935 *(u32 *)(&ndev->dev_addr[0]) = in_be32(&fec->paddr1); 936 *(u16 *)(&ndev->dev_addr[4]) = in_be32(&fec->paddr2) >> 16; 937 } 938 939 /* 940 * Check if the MAC address is valid, if not get a random one 941 */ 942 if (!is_valid_ether_addr(ndev->dev_addr)) { 943 eth_hw_addr_random(ndev); 944 dev_warn(&ndev->dev, "using random MAC address %pM\n", 945 ndev->dev_addr); 946 } 947 948 priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT); 949 950 /* 951 * Link mode configuration 952 */ 953 954 /* Start with safe defaults for link connection */ 955 priv->speed = 100; 956 priv->duplex = DUPLEX_HALF; 957 priv->mdio_speed = ((mpc5xxx_get_bus_frequency(np) >> 20) / 5) << 1; 958 959 /* The current speed preconfigures the speed of the MII link */ 960 prop = of_get_property(np, "current-speed", &prop_size); 961 if (prop && (prop_size >= sizeof(u32) * 2)) { 962 priv->speed = prop[0]; 963 priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF; 964 } 965 966 /* If there is a phy handle, then get the PHY node */ 967 priv->phy_node = of_parse_phandle(np, "phy-handle", 0); 968 969 /* the 7-wire property means don't use MII mode */ 970 if (of_find_property(np, "fsl,7-wire-mode", NULL)) { 971 priv->seven_wire_mode = 1; 972 dev_info(&ndev->dev, "using 7-wire PHY mode\n"); 973 } 974 975 /* Hardware init */ 976 mpc52xx_fec_hw_init(ndev); 977 mpc52xx_fec_reset_stats(ndev); 978 979 rv = register_netdev(ndev); 980 if (rv < 0) 981 goto err_node; 982 983 /* We're done ! */ 984 dev_set_drvdata(&op->dev, ndev); 985 printk(KERN_INFO "%s: %s MAC %pM\n", 986 ndev->name, op->dev.of_node->full_name, ndev->dev_addr); 987 988 return 0; 989 990 err_node: 991 of_node_put(priv->phy_node); 992 irq_dispose_mapping(ndev->irq); 993 err_rx_tx_dmatsk: 994 if (priv->rx_dmatsk) 995 bcom_fec_rx_release(priv->rx_dmatsk); 996 if (priv->tx_dmatsk) 997 bcom_fec_tx_release(priv->tx_dmatsk); 998 iounmap(priv->fec); 999 err_mem_region: 1000 release_mem_region(mem.start, sizeof(struct mpc52xx_fec)); 1001 err_netdev: 1002 free_netdev(ndev); 1003 1004 return rv; 1005 } 1006 1007 static int 1008 mpc52xx_fec_remove(struct platform_device *op) 1009 { 1010 struct net_device *ndev; 1011 struct mpc52xx_fec_priv *priv; 1012 1013 ndev = dev_get_drvdata(&op->dev); 1014 priv = netdev_priv(ndev); 1015 1016 unregister_netdev(ndev); 1017 1018 if (priv->phy_node) 1019 of_node_put(priv->phy_node); 1020 priv->phy_node = NULL; 1021 1022 irq_dispose_mapping(ndev->irq); 1023 1024 bcom_fec_rx_release(priv->rx_dmatsk); 1025 bcom_fec_tx_release(priv->tx_dmatsk); 1026 1027 iounmap(priv->fec); 1028 1029 release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec)); 1030 1031 free_netdev(ndev); 1032 1033 dev_set_drvdata(&op->dev, NULL); 1034 return 0; 1035 } 1036 1037 #ifdef CONFIG_PM 1038 static int mpc52xx_fec_of_suspend(struct platform_device *op, pm_message_t state) 1039 { 1040 struct net_device *dev = dev_get_drvdata(&op->dev); 1041 1042 if (netif_running(dev)) 1043 mpc52xx_fec_close(dev); 1044 1045 return 0; 1046 } 1047 1048 static int mpc52xx_fec_of_resume(struct platform_device *op) 1049 { 1050 struct net_device *dev = dev_get_drvdata(&op->dev); 1051 1052 mpc52xx_fec_hw_init(dev); 1053 mpc52xx_fec_reset_stats(dev); 1054 1055 if (netif_running(dev)) 1056 mpc52xx_fec_open(dev); 1057 1058 return 0; 1059 } 1060 #endif 1061 1062 static struct of_device_id mpc52xx_fec_match[] = { 1063 { .compatible = "fsl,mpc5200b-fec", }, 1064 { .compatible = "fsl,mpc5200-fec", }, 1065 { .compatible = "mpc5200-fec", }, 1066 { } 1067 }; 1068 1069 MODULE_DEVICE_TABLE(of, mpc52xx_fec_match); 1070 1071 static struct platform_driver mpc52xx_fec_driver = { 1072 .driver = { 1073 .name = DRIVER_NAME, 1074 .owner = THIS_MODULE, 1075 .of_match_table = mpc52xx_fec_match, 1076 }, 1077 .probe = mpc52xx_fec_probe, 1078 .remove = mpc52xx_fec_remove, 1079 #ifdef CONFIG_PM 1080 .suspend = mpc52xx_fec_of_suspend, 1081 .resume = mpc52xx_fec_of_resume, 1082 #endif 1083 }; 1084 1085 1086 /* ======================================================================== */ 1087 /* Module */ 1088 /* ======================================================================== */ 1089 1090 static int __init 1091 mpc52xx_fec_init(void) 1092 { 1093 #ifdef CONFIG_FEC_MPC52xx_MDIO 1094 int ret; 1095 ret = platform_driver_register(&mpc52xx_fec_mdio_driver); 1096 if (ret) { 1097 printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n"); 1098 return ret; 1099 } 1100 #endif 1101 return platform_driver_register(&mpc52xx_fec_driver); 1102 } 1103 1104 static void __exit 1105 mpc52xx_fec_exit(void) 1106 { 1107 platform_driver_unregister(&mpc52xx_fec_driver); 1108 #ifdef CONFIG_FEC_MPC52xx_MDIO 1109 platform_driver_unregister(&mpc52xx_fec_mdio_driver); 1110 #endif 1111 } 1112 1113 1114 module_init(mpc52xx_fec_init); 1115 module_exit(mpc52xx_fec_exit); 1116 1117 MODULE_LICENSE("GPL"); 1118 MODULE_AUTHOR("Dale Farnsworth"); 1119 MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC"); 1120