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