pasemi_mac.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2006-2007 PA Semi, Inc
   4 *
   5 * Driver for the PA Semi PWRficient onchip 1G/10G Ethernet MACs
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/pci.h>
  10#include <linux/slab.h>
  11#include <linux/interrupt.h>
  12#include <linux/dmaengine.h>
  13#include <linux/delay.h>
  14#include <linux/netdevice.h>
  15#include <linux/of_mdio.h>
  16#include <linux/etherdevice.h>
  17#include <asm/dma-mapping.h>
  18#include <linux/in.h>
  19#include <linux/skbuff.h>
  20
  21#include <linux/ip.h>
  22#include <net/checksum.h>
  23#include <linux/prefetch.h>
  24
  25#include <asm/irq.h>
  26#include <asm/firmware.h>
  27#include <asm/pasemi_dma.h>
  28
  29#include "pasemi_mac.h"
  30
  31/* We have our own align, since ppc64 in general has it at 0 because
  32 * of design flaws in some of the server bridge chips. However, for
  33 * PWRficient doing the unaligned copies is more expensive than doing
  34 * unaligned DMA, so make sure the data is aligned instead.
  35 */
  36#define LOCAL_SKB_ALIGN	2
  37
  38/* TODO list
  39 *
  40 * - Multicast support
  41 * - Large MTU support
  42 * - Multiqueue RX/TX
  43 */
  44
  45#define PE_MIN_MTU	(ETH_ZLEN + ETH_HLEN)
  46#define PE_MAX_MTU	9000
  47#define PE_DEF_MTU	ETH_DATA_LEN
  48
  49#define DEFAULT_MSG_ENABLE	  \
  50	(NETIF_MSG_DRV		| \
  51	 NETIF_MSG_PROBE	| \
  52	 NETIF_MSG_LINK		| \
  53	 NETIF_MSG_TIMER	| \
  54	 NETIF_MSG_IFDOWN	| \
  55	 NETIF_MSG_IFUP		| \
  56	 NETIF_MSG_RX_ERR	| \
  57	 NETIF_MSG_TX_ERR)
  58
  59MODULE_LICENSE("GPL");
  60MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
  61MODULE_DESCRIPTION("PA Semi PWRficient Ethernet driver");
  62
  63static int debug = -1;	/* -1 == use DEFAULT_MSG_ENABLE as value */
  64module_param(debug, int, 0);
  65MODULE_PARM_DESC(debug, "PA Semi MAC bitmapped debugging message enable value");
  66
  67extern const struct ethtool_ops pasemi_mac_ethtool_ops;
  68
  69static int translation_enabled(void)
  70{
  71#if defined(CONFIG_PPC_PASEMI_IOMMU_DMA_FORCE)
  72	return 1;
  73#else
  74	return firmware_has_feature(FW_FEATURE_LPAR);
  75#endif
  76}
  77
  78static void write_iob_reg(unsigned int reg, unsigned int val)
  79{
  80	pasemi_write_iob_reg(reg, val);
  81}
  82
  83static unsigned int read_mac_reg(const struct pasemi_mac *mac, unsigned int reg)
  84{
  85	return pasemi_read_mac_reg(mac->dma_if, reg);
  86}
  87
  88static void write_mac_reg(const struct pasemi_mac *mac, unsigned int reg,
  89			  unsigned int val)
  90{
  91	pasemi_write_mac_reg(mac->dma_if, reg, val);
  92}
  93
  94static unsigned int read_dma_reg(unsigned int reg)
  95{
  96	return pasemi_read_dma_reg(reg);
  97}
  98
  99static void write_dma_reg(unsigned int reg, unsigned int val)
 100{
 101	pasemi_write_dma_reg(reg, val);
 102}
 103
 104static struct pasemi_mac_rxring *rx_ring(const struct pasemi_mac *mac)
 105{
 106	return mac->rx;
 107}
 108
 109static struct pasemi_mac_txring *tx_ring(const struct pasemi_mac *mac)
 110{
 111	return mac->tx;
 112}
 113
 114static inline void prefetch_skb(const struct sk_buff *skb)
 115{
 116	const void *d = skb;
 117
 118	prefetch(d);
 119	prefetch(d+64);
 120	prefetch(d+128);
 121	prefetch(d+192);
 122}
 123
 124static int mac_to_intf(struct pasemi_mac *mac)
 125{
 126	struct pci_dev *pdev = mac->pdev;
 127	u32 tmp;
 128	int nintf, off, i, j;
 129	int devfn = pdev->devfn;
 130
 131	tmp = read_dma_reg(PAS_DMA_CAP_IFI);
 132	nintf = (tmp & PAS_DMA_CAP_IFI_NIN_M) >> PAS_DMA_CAP_IFI_NIN_S;
 133	off = (tmp & PAS_DMA_CAP_IFI_IOFF_M) >> PAS_DMA_CAP_IFI_IOFF_S;
 134
 135	/* IOFF contains the offset to the registers containing the
 136	 * DMA interface-to-MAC-pci-id mappings, and NIN contains number
 137	 * of total interfaces. Each register contains 4 devfns.
 138	 * Just do a linear search until we find the devfn of the MAC
 139	 * we're trying to look up.
 140	 */
 141
 142	for (i = 0; i < (nintf+3)/4; i++) {
 143		tmp = read_dma_reg(off+4*i);
 144		for (j = 0; j < 4; j++) {
 145			if (((tmp >> (8*j)) & 0xff) == devfn)
 146				return i*4 + j;
 147		}
 148	}
 149	return -1;
 150}
 151
 152static void pasemi_mac_intf_disable(struct pasemi_mac *mac)
 153{
 154	unsigned int flags;
 155
 156	flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 157	flags &= ~PAS_MAC_CFG_PCFG_PE;
 158	write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
 159}
 160
 161static void pasemi_mac_intf_enable(struct pasemi_mac *mac)
 162{
 163	unsigned int flags;
 164
 165	flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
 166	flags |= PAS_MAC_CFG_PCFG_PE;
 167	write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
 168}
 169
 170static int pasemi_get_mac_addr(struct pasemi_mac *mac)
 171{
 172	struct pci_dev *pdev = mac->pdev;
 173	struct device_node *dn = pci_device_to_OF_node(pdev);
 174	int len;
 175	const u8 *maddr;
 176	u8 addr[ETH_ALEN];
 177
 178	if (!dn) {
 179		dev_dbg(&pdev->dev,
 180			  "No device node for mac, not configuring\n");
 181		return -ENOENT;
 182	}
 183
 184	maddr = of_get_property(dn, "local-mac-address", &len);
 185
 186	if (maddr && len == ETH_ALEN) {
 187		memcpy(mac->mac_addr, maddr, ETH_ALEN);
 188		return 0;
 189	}
 190
 191	/* Some old versions of firmware mistakenly uses mac-address
 192	 * (and as a string) instead of a byte array in local-mac-address.
 193	 */
 194
 195	if (maddr == NULL)
 196		maddr = of_get_property(dn, "mac-address", NULL);
 197
 198	if (maddr == NULL) {
 199		dev_warn(&pdev->dev,
 200			 "no mac address in device tree, not configuring\n");
 201		return -ENOENT;
 202	}
 203
 204	if (!mac_pton(maddr, addr)) {
 205		dev_warn(&pdev->dev,
 206			 "can't parse mac address, not configuring\n");
 207		return -EINVAL;
 208	}
 209
 210	memcpy(mac->mac_addr, addr, ETH_ALEN);
 211
 212	return 0;
 213}
 214
 215static int pasemi_mac_set_mac_addr(struct net_device *dev, void *p)
 216{
 217	struct pasemi_mac *mac = netdev_priv(dev);
 218	struct sockaddr *addr = p;
 219	unsigned int adr0, adr1;
 220
 221	if (!is_valid_ether_addr(addr->sa_data))
 222		return -EADDRNOTAVAIL;
 223
 224	eth_hw_addr_set(dev, addr->sa_data);
 225
 226	adr0 = dev->dev_addr[2] << 24 |
 227	       dev->dev_addr[3] << 16 |
 228	       dev->dev_addr[4] << 8 |
 229	       dev->dev_addr[5];
 230	adr1 = read_mac_reg(mac, PAS_MAC_CFG_ADR1);
 231	adr1 &= ~0xffff;
 232	adr1 |= dev->dev_addr[0] << 8 | dev->dev_addr[1];
 233
 234	pasemi_mac_intf_disable(mac);
 235	write_mac_reg(mac, PAS_MAC_CFG_ADR0, adr0);
 236	write_mac_reg(mac, PAS_MAC_CFG_ADR1, adr1);
 237	pasemi_mac_intf_enable(mac);
 238
 239	return 0;
 240}
 241
 242static int pasemi_mac_unmap_tx_skb(struct pasemi_mac *mac,
 243				    const int nfrags,
 244				    struct sk_buff *skb,
 245				    const dma_addr_t *dmas)
 246{
 247	int f;
 248	struct pci_dev *pdev = mac->dma_pdev;
 249
 250	dma_unmap_single(&pdev->dev, dmas[0], skb_headlen(skb), DMA_TO_DEVICE);
 251
 252	for (f = 0; f < nfrags; f++) {
 253		const skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
 254
 255		dma_unmap_page(&pdev->dev, dmas[f + 1], skb_frag_size(frag),
 256			       DMA_TO_DEVICE);
 257	}
 258	dev_kfree_skb_irq(skb);
 259
 260	/* Freed descriptor slot + main SKB ptr + nfrags additional ptrs,
 261	 * aligned up to a power of 2
 262	 */
 263	return (nfrags + 3) & ~1;
 264}
 265
 266static struct pasemi_mac_csring *pasemi_mac_setup_csring(struct pasemi_mac *mac)
 267{
 268	struct pasemi_mac_csring *ring;
 269	u32 val;
 270	unsigned int cfg;
 271	int chno;
 272
 273	ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_csring),
 274				       offsetof(struct pasemi_mac_csring, chan));
 275
 276	if (!ring) {
 277		dev_err(&mac->pdev->dev, "Can't allocate checksum channel\n");
 278		goto out_chan;
 279	}
 280
 281	chno = ring->chan.chno;
 282
 283	ring->size = CS_RING_SIZE;
 284	ring->next_to_fill = 0;
 285
 286	/* Allocate descriptors */
 287	if (pasemi_dma_alloc_ring(&ring->chan, CS_RING_SIZE))
 288		goto out_ring_desc;
 289
 290	write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
 291		      PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
 292	val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
 293	val |= PAS_DMA_TXCHAN_BASEU_SIZ(CS_RING_SIZE >> 3);
 294
 295	write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val);
 296
 297	ring->events[0] = pasemi_dma_alloc_flag();
 298	ring->events[1] = pasemi_dma_alloc_flag();
 299	if (ring->events[0] < 0 || ring->events[1] < 0)
 300		goto out_flags;
 301
 302	pasemi_dma_clear_flag(ring->events[0]);
 303	pasemi_dma_clear_flag(ring->events[1]);
 304
 305	ring->fun = pasemi_dma_alloc_fun();
 306	if (ring->fun < 0)
 307		goto out_fun;
 308
 309	cfg = PAS_DMA_TXCHAN_CFG_TY_FUNC | PAS_DMA_TXCHAN_CFG_UP |
 310	      PAS_DMA_TXCHAN_CFG_TATTR(ring->fun) |
 311	      PAS_DMA_TXCHAN_CFG_LPSQ | PAS_DMA_TXCHAN_CFG_LPDQ;
 312
 313	if (translation_enabled())
 314		cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
 315
 316	write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
 317
 318	/* enable channel */
 319	pasemi_dma_start_chan(&ring->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ |
 320					   PAS_DMA_TXCHAN_TCMDSTA_DB |
 321					   PAS_DMA_TXCHAN_TCMDSTA_DE |
 322					   PAS_DMA_TXCHAN_TCMDSTA_DA);
 323
 324	return ring;
 325
 326out_fun:
 327out_flags:
 328	if (ring->events[0] >= 0)
 329		pasemi_dma_free_flag(ring->events[0]);
 330	if (ring->events[1] >= 0)
 331		pasemi_dma_free_flag(ring->events[1]);
 332	pasemi_dma_free_ring(&ring->chan);
 333out_ring_desc:
 334	pasemi_dma_free_chan(&ring->chan);
 335out_chan:
 336
 337	return NULL;
 338}
 339
 340static void pasemi_mac_setup_csrings(struct pasemi_mac *mac)
 341{
 342	int i;
 343	mac->cs[0] = pasemi_mac_setup_csring(mac);
 344	if (mac->type == MAC_TYPE_XAUI)
 345		mac->cs[1] = pasemi_mac_setup_csring(mac);
 346	else
 347		mac->cs[1] = 0;
 348
 349	for (i = 0; i < MAX_CS; i++)
 350		if (mac->cs[i])
 351			mac->num_cs++;
 352}
 353
 354static void pasemi_mac_free_csring(struct pasemi_mac_csring *csring)
 355{
 356	pasemi_dma_stop_chan(&csring->chan);
 357	pasemi_dma_free_flag(csring->events[0]);
 358	pasemi_dma_free_flag(csring->events[1]);
 359	pasemi_dma_free_ring(&csring->chan);
 360	pasemi_dma_free_chan(&csring->chan);
 361	pasemi_dma_free_fun(csring->fun);
 362}
 363
 364static int pasemi_mac_setup_rx_resources(const struct net_device *dev)
 365{
 366	struct pasemi_mac_rxring *ring;
 367	struct pasemi_mac *mac = netdev_priv(dev);
 368	int chno;
 369	unsigned int cfg;
 370
 371	ring = pasemi_dma_alloc_chan(RXCHAN, sizeof(struct pasemi_mac_rxring),
 372				     offsetof(struct pasemi_mac_rxring, chan));
 373
 374	if (!ring) {
 375		dev_err(&mac->pdev->dev, "Can't allocate RX channel\n");
 376		goto out_chan;
 377	}
 378	chno = ring->chan.chno;
 379
 380	spin_lock_init(&ring->lock);
 381
 382	ring->size = RX_RING_SIZE;
 383	ring->ring_info = kcalloc(RX_RING_SIZE,
 384				  sizeof(struct pasemi_mac_buffer),
 385				  GFP_KERNEL);
 386
 387	if (!ring->ring_info)
 388		goto out_ring_info;
 389
 390	/* Allocate descriptors */
 391	if (pasemi_dma_alloc_ring(&ring->chan, RX_RING_SIZE))
 392		goto out_ring_desc;
 393
 394	ring->buffers = dma_alloc_coherent(&mac->dma_pdev->dev,
 395					   RX_RING_SIZE * sizeof(u64),
 396					   &ring->buf_dma, GFP_KERNEL);
 397	if (!ring->buffers)
 398		goto out_ring_desc;
 399
 400	write_dma_reg(PAS_DMA_RXCHAN_BASEL(chno),
 401		      PAS_DMA_RXCHAN_BASEL_BRBL(ring->chan.ring_dma));
 402
 403	write_dma_reg(PAS_DMA_RXCHAN_BASEU(chno),
 404		      PAS_DMA_RXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32) |
 405		      PAS_DMA_RXCHAN_BASEU_SIZ(RX_RING_SIZE >> 3));
 406
 407	cfg = PAS_DMA_RXCHAN_CFG_HBU(2);
 408
 409	if (translation_enabled())
 410		cfg |= PAS_DMA_RXCHAN_CFG_CTR;
 411
 412	write_dma_reg(PAS_DMA_RXCHAN_CFG(chno), cfg);
 413
 414	write_dma_reg(PAS_DMA_RXINT_BASEL(mac->dma_if),
 415		      PAS_DMA_RXINT_BASEL_BRBL(ring->buf_dma));
 416
 417	write_dma_reg(PAS_DMA_RXINT_BASEU(mac->dma_if),
 418		      PAS_DMA_RXINT_BASEU_BRBH(ring->buf_dma >> 32) |
 419		      PAS_DMA_RXINT_BASEU_SIZ(RX_RING_SIZE >> 3));
 420
 421	cfg = PAS_DMA_RXINT_CFG_DHL(2) | PAS_DMA_RXINT_CFG_L2 |
 422	      PAS_DMA_RXINT_CFG_LW | PAS_DMA_RXINT_CFG_RBP |
 423	      PAS_DMA_RXINT_CFG_HEN;
 424
 425	if (translation_enabled())
 426		cfg |= PAS_DMA_RXINT_CFG_ITRR | PAS_DMA_RXINT_CFG_ITR;
 427
 428	write_dma_reg(PAS_DMA_RXINT_CFG(mac->dma_if), cfg);
 429
 430	ring->next_to_fill = 0;
 431	ring->next_to_clean = 0;
 432	ring->mac = mac;
 433	mac->rx = ring;
 434
 435	return 0;
 436
 437out_ring_desc:
 438	kfree(ring->ring_info);
 439out_ring_info:
 440	pasemi_dma_free_chan(&ring->chan);
 441out_chan:
 442	return -ENOMEM;
 443}
 444
 445static struct pasemi_mac_txring *
 446pasemi_mac_setup_tx_resources(const struct net_device *dev)
 447{
 448	struct pasemi_mac *mac = netdev_priv(dev);
 449	u32 val;
 450	struct pasemi_mac_txring *ring;
 451	unsigned int cfg;
 452	int chno;
 453
 454	ring = pasemi_dma_alloc_chan(TXCHAN, sizeof(struct pasemi_mac_txring),
 455				     offsetof(struct pasemi_mac_txring, chan));
 456
 457	if (!ring) {
 458		dev_err(&mac->pdev->dev, "Can't allocate TX channel\n");
 459		goto out_chan;
 460	}
 461
 462	chno = ring->chan.chno;
 463
 464	spin_lock_init(&ring->lock);
 465
 466	ring->size = TX_RING_SIZE;
 467	ring->ring_info = kcalloc(TX_RING_SIZE,
 468				  sizeof(struct pasemi_mac_buffer),
 469				  GFP_KERNEL);
 470	if (!ring->ring_info)
 471		goto out_ring_info;
 472
 473	/* Allocate descriptors */
 474	if (pasemi_dma_alloc_ring(&ring->chan, TX_RING_SIZE))
 475		goto out_ring_desc;
 476
 477	write_dma_reg(PAS_DMA_TXCHAN_BASEL(chno),
 478		      PAS_DMA_TXCHAN_BASEL_BRBL(ring->chan.ring_dma));
 479	val = PAS_DMA_TXCHAN_BASEU_BRBH(ring->chan.ring_dma >> 32);
 480	val |= PAS_DMA_TXCHAN_BASEU_SIZ(TX_RING_SIZE >> 3);
 481
 482	write_dma_reg(PAS_DMA_TXCHAN_BASEU(chno), val);
 483
 484	cfg = PAS_DMA_TXCHAN_CFG_TY_IFACE |
 485	      PAS_DMA_TXCHAN_CFG_TATTR(mac->dma_if) |
 486	      PAS_DMA_TXCHAN_CFG_UP |
 487	      PAS_DMA_TXCHAN_CFG_WT(4);
 488
 489	if (translation_enabled())
 490		cfg |= PAS_DMA_TXCHAN_CFG_TRD | PAS_DMA_TXCHAN_CFG_TRR;
 491
 492	write_dma_reg(PAS_DMA_TXCHAN_CFG(chno), cfg);
 493
 494	ring->next_to_fill = 0;
 495	ring->next_to_clean = 0;
 496	ring->mac = mac;
 497
 498	return ring;
 499
 500out_ring_desc:
 501	kfree(ring->ring_info);
 502out_ring_info:
 503	pasemi_dma_free_chan(&ring->chan);
 504out_chan:
 505	return NULL;
 506}
 507
 508static void pasemi_mac_free_tx_resources(struct pasemi_mac *mac)
 509{
 510	struct pasemi_mac_txring *txring = tx_ring(mac);
 511	unsigned int i, j;
 512	struct pasemi_mac_buffer *info;
 513	dma_addr_t dmas[MAX_SKB_FRAGS+1];
 514	int freed, nfrags;
 515	int start, limit;
 516
 517	start = txring->next_to_clean;
 518	limit = txring->next_to_fill;
 519
 520	/* Compensate for when fill has wrapped and clean has not */
 521	if (start > limit)
 522		limit += TX_RING_SIZE;
 523
 524	for (i = start; i < limit; i += freed) {
 525		info = &txring->ring_info[(i+1) & (TX_RING_SIZE-1)];
 526		if (info->dma && info->skb) {
 527			nfrags = skb_shinfo(info->skb)->nr_frags;
 528			for (j = 0; j <= nfrags; j++)
 529				dmas[j] = txring->ring_info[(i+1+j) &
 530						(TX_RING_SIZE-1)].dma;
 531			freed = pasemi_mac_unmap_tx_skb(mac, nfrags,
 532							info->skb, dmas);
 533		} else {
 534			freed = 2;
 535		}
 536	}
 537
 538	kfree(txring->ring_info);
 539	pasemi_dma_free_chan(&txring->chan);
 540
 541}
 542
 543static void pasemi_mac_free_rx_buffers(struct pasemi_mac *mac)
 544{
 545	struct pasemi_mac_rxring *rx = rx_ring(mac);
 546	unsigned int i;
 547	struct pasemi_mac_buffer *info;
 548
 549	for (i = 0; i < RX_RING_SIZE; i++) {
 550		info = &RX_DESC_INFO(rx, i);
 551		if (info->skb && info->dma) {
 552			dma_unmap_single(&mac->dma_pdev->dev, info->dma,
 553					 info->skb->len, DMA_FROM_DEVICE);
 554			dev_kfree_skb_any(info->skb);
 555		}
 556		info->dma = 0;
 557		info->skb = NULL;
 558	}
 559
 560	for (i = 0; i < RX_RING_SIZE; i++)
 561		RX_BUFF(rx, i) = 0;
 562}
 563
 564static void pasemi_mac_free_rx_resources(struct pasemi_mac *mac)
 565{
 566	pasemi_mac_free_rx_buffers(mac);
 567
 568	dma_free_coherent(&mac->dma_pdev->dev, RX_RING_SIZE * sizeof(u64),
 569			  rx_ring(mac)->buffers, rx_ring(mac)->buf_dma);
 570
 571	kfree(rx_ring(mac)->ring_info);
 572	pasemi_dma_free_chan(&rx_ring(mac)->chan);
 573	mac->rx = NULL;
 574}
 575
 576static void pasemi_mac_replenish_rx_ring(struct net_device *dev,
 577					 const int limit)
 578{
 579	const struct pasemi_mac *mac = netdev_priv(dev);
 580	struct pasemi_mac_rxring *rx = rx_ring(mac);
 581	int fill, count;
 582
 583	if (limit <= 0)
 584		return;
 585
 586	fill = rx_ring(mac)->next_to_fill;
 587	for (count = 0; count < limit; count++) {
 588		struct pasemi_mac_buffer *info = &RX_DESC_INFO(rx, fill);
 589		u64 *buff = &RX_BUFF(rx, fill);
 590		struct sk_buff *skb;
 591		dma_addr_t dma;
 592
 593		/* Entry in use? */
 594		WARN_ON(*buff);
 595
 596		skb = netdev_alloc_skb(dev, mac->bufsz);
 597		skb_reserve(skb, LOCAL_SKB_ALIGN);
 598
 599		if (unlikely(!skb))
 600			break;
 601
 602		dma = dma_map_single(&mac->dma_pdev->dev, skb->data,
 603				     mac->bufsz - LOCAL_SKB_ALIGN,
 604				     DMA_FROM_DEVICE);
 605
 606		if (dma_mapping_error(&mac->dma_pdev->dev, dma)) {
 607			dev_kfree_skb_irq(info->skb);
 608			break;
 609		}
 610
 611		info->skb = skb;
 612		info->dma = dma;
 613		*buff = XCT_RXB_LEN(mac->bufsz) | XCT_RXB_ADDR(dma);
 614		fill++;
 615	}
 616
 617	wmb();
 618
 619	write_dma_reg(PAS_DMA_RXINT_INCR(mac->dma_if), count);
 620
 621	rx_ring(mac)->next_to_fill = (rx_ring(mac)->next_to_fill + count) &
 622				(RX_RING_SIZE - 1);
 623}
 624
 625static void pasemi_mac_restart_rx_intr(const struct pasemi_mac *mac)
 626{
 627	struct pasemi_mac_rxring *rx = rx_ring(mac);
 628	unsigned int reg, pcnt;
 629	/* Re-enable packet count interrupts: finally
 630	 * ack the packet count interrupt we got in rx_intr.
 631	 */
 632
 633	pcnt = *rx->chan.status & PAS_STATUS_PCNT_M;
 634
 635	reg = PAS_IOB_DMA_RXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_RXCH_RESET_PINTC;
 636
 637	if (*rx->chan.status & PAS_STATUS_TIMER)
 638		reg |= PAS_IOB_DMA_RXCH_RESET_TINTC;
 639
 640	write_iob_reg(PAS_IOB_DMA_RXCH_RESET(mac->rx->chan.chno), reg);
 641}
 642
 643static void pasemi_mac_restart_tx_intr(const struct pasemi_mac *mac)
 644{
 645	unsigned int reg, pcnt;
 646
 647	/* Re-enable packet count interrupts */
 648	pcnt = *tx_ring(mac)->chan.status & PAS_STATUS_PCNT_M;
 649
 650	reg = PAS_IOB_DMA_TXCH_RESET_PCNT(pcnt) | PAS_IOB_DMA_TXCH_RESET_PINTC;
 651
 652	write_iob_reg(PAS_IOB_DMA_TXCH_RESET(tx_ring(mac)->chan.chno), reg);
 653}
 654
 655
 656static inline void pasemi_mac_rx_error(const struct pasemi_mac *mac,
 657				       const u64 macrx)
 658{
 659	unsigned int rcmdsta, ccmdsta;
 660	struct pasemi_dmachan *chan = &rx_ring(mac)->chan;
 661
 662	if (!netif_msg_rx_err(mac))
 663		return;
 664
 665	rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
 666	ccmdsta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(chan->chno));
 667
 668	printk(KERN_ERR "pasemi_mac: rx error. macrx %016llx, rx status %llx\n",
 669		macrx, *chan->status);
 670
 671	printk(KERN_ERR "pasemi_mac: rcmdsta %08x ccmdsta %08x\n",
 672		rcmdsta, ccmdsta);
 673}
 674
 675static inline void pasemi_mac_tx_error(const struct pasemi_mac *mac,
 676				       const u64 mactx)
 677{
 678	unsigned int cmdsta;
 679	struct pasemi_dmachan *chan = &tx_ring(mac)->chan;
 680
 681	if (!netif_msg_tx_err(mac))
 682		return;
 683
 684	cmdsta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(chan->chno));
 685
 686	printk(KERN_ERR "pasemi_mac: tx error. mactx 0x%016llx, "\
 687		"tx status 0x%016llx\n", mactx, *chan->status);
 688
 689	printk(KERN_ERR "pasemi_mac: tcmdsta 0x%08x\n", cmdsta);
 690}
 691
 692static int pasemi_mac_clean_rx(struct pasemi_mac_rxring *rx,
 693			       const int limit)
 694{
 695	const struct pasemi_dmachan *chan = &rx->chan;
 696	struct pasemi_mac *mac = rx->mac;
 697	struct pci_dev *pdev = mac->dma_pdev;
 698	unsigned int n;
 699	int count, buf_index, tot_bytes, packets;
 700	struct pasemi_mac_buffer *info;
 701	struct sk_buff *skb;
 702	unsigned int len;
 703	u64 macrx, eval;
 704	dma_addr_t dma;
 705
 706	tot_bytes = 0;
 707	packets = 0;
 708
 709	spin_lock(&rx->lock);
 710
 711	n = rx->next_to_clean;
 712
 713	prefetch(&RX_DESC(rx, n));
 714
 715	for (count = 0; count < limit; count++) {
 716		macrx = RX_DESC(rx, n);
 717		prefetch(&RX_DESC(rx, n+4));
 718
 719		if ((macrx & XCT_MACRX_E) ||
 720		    (*chan->status & PAS_STATUS_ERROR))
 721			pasemi_mac_rx_error(mac, macrx);
 722
 723		if (!(macrx & XCT_MACRX_O))
 724			break;
 725
 726		info = NULL;
 727
 728		BUG_ON(!(macrx & XCT_MACRX_RR_8BRES));
 729
 730		eval = (RX_DESC(rx, n+1) & XCT_RXRES_8B_EVAL_M) >>
 731			XCT_RXRES_8B_EVAL_S;
 732		buf_index = eval-1;
 733
 734		dma = (RX_DESC(rx, n+2) & XCT_PTR_ADDR_M);
 735		info = &RX_DESC_INFO(rx, buf_index);
 736
 737		skb = info->skb;
 738
 739		prefetch_skb(skb);
 740
 741		len = (macrx & XCT_MACRX_LLEN_M) >> XCT_MACRX_LLEN_S;
 742
 743		dma_unmap_single(&pdev->dev, dma,
 744				 mac->bufsz - LOCAL_SKB_ALIGN,
 745				 DMA_FROM_DEVICE);
 746
 747		if (macrx & XCT_MACRX_CRC) {
 748			/* CRC error flagged */
 749			mac->netdev->stats.rx_errors++;
 750			mac->netdev->stats.rx_crc_errors++;
 751			/* No need to free skb, it'll be reused */
 752			goto next;
 753		}
 754
 755		info->skb = NULL;
 756		info->dma = 0;
 757
 758		if (likely((macrx & XCT_MACRX_HTY_M) == XCT_MACRX_HTY_IPV4_OK)) {
 759			skb->ip_summed = CHECKSUM_UNNECESSARY;
 760			skb->csum = (macrx & XCT_MACRX_CSUM_M) >>
 761					   XCT_MACRX_CSUM_S;
 762		} else {
 763			skb_checksum_none_assert(skb);
 764		}
 765
 766		packets++;
 767		tot_bytes += len;
 768
 769		/* Don't include CRC */
 770		skb_put(skb, len-4);
 771
 772		skb->protocol = eth_type_trans(skb, mac->netdev);
 773		napi_gro_receive(&mac->napi, skb);
 774
 775next:
 776		RX_DESC(rx, n) = 0;
 777		RX_DESC(rx, n+1) = 0;
 778
 779		/* Need to zero it out since hardware doesn't, since the
 780		 * replenish loop uses it to tell when it's done.
 781		 */
 782		RX_BUFF(rx, buf_index) = 0;
 783
 784		n += 4;
 785	}
 786
 787	if (n > RX_RING_SIZE) {
 788		/* Errata 5971 workaround: L2 target of headers */
 789		write_iob_reg(PAS_IOB_COM_PKTHDRCNT, 0);
 790		n &= (RX_RING_SIZE-1);
 791	}
 792
 793	rx_ring(mac)->next_to_clean = n;
 794
 795	/* Increase is in number of 16-byte entries, and since each descriptor
 796	 * with an 8BRES takes up 3x8 bytes (padded to 4x8), increase with
 797	 * count*2.
 798	 */
 799	write_dma_reg(PAS_DMA_RXCHAN_INCR(mac->rx->chan.chno), count << 1);
 800
 801	pasemi_mac_replenish_rx_ring(mac->netdev, count);
 802
 803	mac->netdev->stats.rx_bytes += tot_bytes;
 804	mac->netdev->stats.rx_packets += packets;
 805
 806	spin_unlock(&rx_ring(mac)->lock);
 807
 808	return count;
 809}
 810
 811/* Can't make this too large or we blow the kernel stack limits */
 812#define TX_CLEAN_BATCHSIZE (128/MAX_SKB_FRAGS)
 813
 814static int pasemi_mac_clean_tx(struct pasemi_mac_txring *txring)
 815{
 816	struct pasemi_dmachan *chan = &txring->chan;
 817	struct pasemi_mac *mac = txring->mac;
 818	int i, j;
 819	unsigned int start, descr_count, buf_count, batch_limit;
 820	unsigned int ring_limit;
 821	unsigned int total_count;
 822	unsigned long flags;
 823	struct sk_buff *skbs[TX_CLEAN_BATCHSIZE];
 824	dma_addr_t dmas[TX_CLEAN_BATCHSIZE][MAX_SKB_FRAGS+1];
 825	int nf[TX_CLEAN_BATCHSIZE];
 826	int nr_frags;
 827
 828	total_count = 0;
 829	batch_limit = TX_CLEAN_BATCHSIZE;
 830restart:
 831	spin_lock_irqsave(&txring->lock, flags);
 832
 833	start = txring->next_to_clean;
 834	ring_limit = txring->next_to_fill;
 835
 836	prefetch(&TX_DESC_INFO(txring, start+1).skb);
 837
 838	/* Compensate for when fill has wrapped but clean has not */
 839	if (start > ring_limit)
 840		ring_limit += TX_RING_SIZE;
 841
 842	buf_count = 0;
 843	descr_count = 0;
 844
 845	for (i = start;
 846	     descr_count < batch_limit && i < ring_limit;
 847	     i += buf_count) {
 848		u64 mactx = TX_DESC(txring, i);
 849		struct sk_buff *skb;
 850
 851		if ((mactx  & XCT_MACTX_E) ||
 852		    (*chan->status & PAS_STATUS_ERROR))
 853			pasemi_mac_tx_error(mac, mactx);
 854
 855		/* Skip over control descriptors */
 856		if (!(mactx & XCT_MACTX_LLEN_M)) {
 857			TX_DESC(txring, i) = 0;
 858			TX_DESC(txring, i+1) = 0;
 859			buf_count = 2;
 860			continue;
 861		}
 862
 863		skb = TX_DESC_INFO(txring, i+1).skb;
 864		nr_frags = TX_DESC_INFO(txring, i).dma;
 865
 866		if (unlikely(mactx & XCT_MACTX_O))
 867			/* Not yet transmitted */
 868			break;
 869
 870		buf_count = 2 + nr_frags;
 871		/* Since we always fill with an even number of entries, make
 872		 * sure we skip any unused one at the end as well.
 873		 */
 874		if (buf_count & 1)
 875			buf_count++;
 876
 877		for (j = 0; j <= nr_frags; j++)
 878			dmas[descr_count][j] = TX_DESC_INFO(txring, i+1+j).dma;
 879
 880		skbs[descr_count] = skb;
 881		nf[descr_count] = nr_frags;
 882
 883		TX_DESC(txring, i) = 0;
 884		TX_DESC(txring, i+1) = 0;
 885
 886		descr_count++;
 887	}
 888	txring->next_to_clean = i & (TX_RING_SIZE-1);
 889
 890	spin_unlock_irqrestore(&txring->lock, flags);
 891	netif_wake_queue(mac->netdev);
 892
 893	for (i = 0; i < descr_count; i++)
 894		pasemi_mac_unmap_tx_skb(mac, nf[i], skbs[i], dmas[i]);
 895
 896	total_count += descr_count;
 897
 898	/* If the batch was full, try to clean more */
 899	if (descr_count == batch_limit)
 900		goto restart;
 901
 902	return total_count;
 903}
 904
 905
 906static irqreturn_t pasemi_mac_rx_intr(int irq, void *data)
 907{
 908	const struct pasemi_mac_rxring *rxring = data;
 909	struct pasemi_mac *mac = rxring->mac;
 910	const struct pasemi_dmachan *chan = &rxring->chan;
 911	unsigned int reg;
 912
 913	if (!(*chan->status & PAS_STATUS_CAUSE_M))
 914		return IRQ_NONE;
 915
 916	/* Don't reset packet count so it won't fire again but clear
 917	 * all others.
 918	 */
 919
 920	reg = 0;
 921	if (*chan->status & PAS_STATUS_SOFT)
 922		reg |= PAS_IOB_DMA_RXCH_RESET_SINTC;
 923	if (*chan->status & PAS_STATUS_ERROR)
 924		reg |= PAS_IOB_DMA_RXCH_RESET_DINTC;
 925
 926	napi_schedule(&mac->napi);
 927
 928	write_iob_reg(PAS_IOB_DMA_RXCH_RESET(chan->chno), reg);
 929
 930	return IRQ_HANDLED;
 931}
 932
 933#define TX_CLEAN_INTERVAL HZ
 934
 935static void pasemi_mac_tx_timer(struct timer_list *t)
 936{
 937	struct pasemi_mac_txring *txring = timer_container_of(txring, t,
 938							      clean_timer);
 939	struct pasemi_mac *mac = txring->mac;
 940
 941	pasemi_mac_clean_tx(txring);
 942
 943	mod_timer(&txring->clean_timer, jiffies + TX_CLEAN_INTERVAL);
 944
 945	pasemi_mac_restart_tx_intr(mac);
 946}
 947
 948static irqreturn_t pasemi_mac_tx_intr(int irq, void *data)
 949{
 950	struct pasemi_mac_txring *txring = data;
 951	const struct pasemi_dmachan *chan = &txring->chan;
 952	struct pasemi_mac *mac = txring->mac;
 953	unsigned int reg;
 954
 955	if (!(*chan->status & PAS_STATUS_CAUSE_M))
 956		return IRQ_NONE;
 957
 958	reg = 0;
 959
 960	if (*chan->status & PAS_STATUS_SOFT)
 961		reg |= PAS_IOB_DMA_TXCH_RESET_SINTC;
 962	if (*chan->status & PAS_STATUS_ERROR)
 963		reg |= PAS_IOB_DMA_TXCH_RESET_DINTC;
 964
 965	mod_timer(&txring->clean_timer, jiffies + (TX_CLEAN_INTERVAL)*2);
 966
 967	napi_schedule(&mac->napi);
 968
 969	if (reg)
 970		write_iob_reg(PAS_IOB_DMA_TXCH_RESET(chan->chno), reg);
 971
 972	return IRQ_HANDLED;
 973}
 974
 975static void pasemi_adjust_link(struct net_device *dev)
 976{
 977	struct pasemi_mac *mac = netdev_priv(dev);
 978	int msg;
 979	unsigned int flags;
 980	unsigned int new_flags;
 981
 982	if (!dev->phydev->link) {
 983		/* If no link, MAC speed settings don't matter. Just report
 984		 * link down and return.
 985		 */
 986		if (mac->link && netif_msg_link(mac))
 987			printk(KERN_INFO "%s: Link is down.\n", dev->name);
 988
 989		netif_carrier_off(dev);
 990		pasemi_mac_intf_disable(mac);
 991		mac->link = 0;
 992
 993		return;
 994	} else {
 995		pasemi_mac_intf_enable(mac);
 996		netif_carrier_on(dev);
 997	}
 998
 999	flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1000	new_flags = flags & ~(PAS_MAC_CFG_PCFG_HD | PAS_MAC_CFG_PCFG_SPD_M |
1001			      PAS_MAC_CFG_PCFG_TSR_M);
1002
1003	if (!dev->phydev->duplex)
1004		new_flags |= PAS_MAC_CFG_PCFG_HD;
1005
1006	switch (dev->phydev->speed) {
1007	case 1000:
1008		new_flags |= PAS_MAC_CFG_PCFG_SPD_1G |
1009			     PAS_MAC_CFG_PCFG_TSR_1G;
1010		break;
1011	case 100:
1012		new_flags |= PAS_MAC_CFG_PCFG_SPD_100M |
1013			     PAS_MAC_CFG_PCFG_TSR_100M;
1014		break;
1015	case 10:
1016		new_flags |= PAS_MAC_CFG_PCFG_SPD_10M |
1017			     PAS_MAC_CFG_PCFG_TSR_10M;
1018		break;
1019	default:
1020		printk("Unsupported speed %d\n", dev->phydev->speed);
1021	}
1022
1023	/* Print on link or speed/duplex change */
1024	msg = mac->link != dev->phydev->link || flags != new_flags;
1025
1026	mac->duplex = dev->phydev->duplex;
1027	mac->speed = dev->phydev->speed;
1028	mac->link = dev->phydev->link;
1029
1030	if (new_flags != flags)
1031		write_mac_reg(mac, PAS_MAC_CFG_PCFG, new_flags);
1032
1033	if (msg && netif_msg_link(mac))
1034		printk(KERN_INFO "%s: Link is up at %d Mbps, %s duplex.\n",
1035		       dev->name, mac->speed, mac->duplex ? "full" : "half");
1036}
1037
1038static int pasemi_mac_phy_init(struct net_device *dev)
1039{
1040	struct pasemi_mac *mac = netdev_priv(dev);
1041	struct device_node *dn, *phy_dn;
1042	struct phy_device *phydev;
1043
1044	dn = pci_device_to_OF_node(mac->pdev);
1045	phy_dn = of_parse_phandle(dn, "phy-handle", 0);
1046
1047	mac->link = 0;
1048	mac->speed = 0;
1049	mac->duplex = -1;
1050
1051	phydev = of_phy_connect(dev, phy_dn, &pasemi_adjust_link, 0,
1052				PHY_INTERFACE_MODE_SGMII);
1053
1054	of_node_put(phy_dn);
1055	if (!phydev) {
1056		printk(KERN_ERR "%s: Could not attach to phy\n", dev->name);
1057		return -ENODEV;
1058	}
1059
1060	return 0;
1061}
1062
1063
1064static int pasemi_mac_open(struct net_device *dev)
1065{
1066	struct pasemi_mac *mac = netdev_priv(dev);
1067	unsigned int flags;
1068	int i, ret;
1069
1070	flags = PAS_MAC_CFG_TXP_FCE | PAS_MAC_CFG_TXP_FPC(3) |
1071		PAS_MAC_CFG_TXP_SL(3) | PAS_MAC_CFG_TXP_COB(0xf) |
1072		PAS_MAC_CFG_TXP_TIFT(8) | PAS_MAC_CFG_TXP_TIFG(12);
1073
1074	write_mac_reg(mac, PAS_MAC_CFG_TXP, flags);
1075
1076	ret = pasemi_mac_setup_rx_resources(dev);
1077	if (ret)
1078		goto out_rx_resources;
1079
1080	mac->tx = pasemi_mac_setup_tx_resources(dev);
1081
1082	if (!mac->tx) {
1083		ret = -ENOMEM;
1084		goto out_tx_ring;
1085	}
1086
1087	/* We might already have allocated rings in case mtu was changed
1088	 * before interface was brought up.
1089	 */
1090	if (dev->mtu > 1500 && !mac->num_cs) {
1091		pasemi_mac_setup_csrings(mac);
1092		if (!mac->num_cs) {
1093			ret = -ENOMEM;
1094			goto out_tx_ring;
1095		}
1096	}
1097
1098	/* Zero out rmon counters */
1099	for (i = 0; i < 32; i++)
1100		write_mac_reg(mac, PAS_MAC_RMON(i), 0);
1101
1102	/* 0x3ff with 33MHz clock is about 31us */
1103	write_iob_reg(PAS_IOB_DMA_COM_TIMEOUTCFG,
1104		      PAS_IOB_DMA_COM_TIMEOUTCFG_TCNT(0x3ff));
1105
1106	write_iob_reg(PAS_IOB_DMA_RXCH_CFG(mac->rx->chan.chno),
1107		      PAS_IOB_DMA_RXCH_CFG_CNTTH(256));
1108
1109	write_iob_reg(PAS_IOB_DMA_TXCH_CFG(mac->tx->chan.chno),
1110		      PAS_IOB_DMA_TXCH_CFG_CNTTH(32));
1111
1112	write_mac_reg(mac, PAS_MAC_IPC_CHNL,
1113		      PAS_MAC_IPC_CHNL_DCHNO(mac->rx->chan.chno) |
1114		      PAS_MAC_IPC_CHNL_BCH(mac->rx->chan.chno));
1115
1116	/* enable rx if */
1117	write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1118		      PAS_DMA_RXINT_RCMDSTA_EN |
1119		      PAS_DMA_RXINT_RCMDSTA_DROPS_M |
1120		      PAS_DMA_RXINT_RCMDSTA_BP |
1121		      PAS_DMA_RXINT_RCMDSTA_OO |
1122		      PAS_DMA_RXINT_RCMDSTA_BT);
1123
1124	/* enable rx channel */
1125	pasemi_dma_start_chan(&rx_ring(mac)->chan, PAS_DMA_RXCHAN_CCMDSTA_DU |
1126						   PAS_DMA_RXCHAN_CCMDSTA_OD |
1127						   PAS_DMA_RXCHAN_CCMDSTA_FD |
1128						   PAS_DMA_RXCHAN_CCMDSTA_DT);
1129
1130	/* enable tx channel */
1131	pasemi_dma_start_chan(&tx_ring(mac)->chan, PAS_DMA_TXCHAN_TCMDSTA_SZ |
1132						   PAS_DMA_TXCHAN_TCMDSTA_DB |
1133						   PAS_DMA_TXCHAN_TCMDSTA_DE |
1134						   PAS_DMA_TXCHAN_TCMDSTA_DA);
1135
1136	pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE);
1137
1138	write_dma_reg(PAS_DMA_RXCHAN_INCR(rx_ring(mac)->chan.chno),
1139		      RX_RING_SIZE>>1);
1140
1141	/* Clear out any residual packet count state from firmware */
1142	pasemi_mac_restart_rx_intr(mac);
1143	pasemi_mac_restart_tx_intr(mac);
1144
1145	flags = PAS_MAC_CFG_PCFG_S1 | PAS_MAC_CFG_PCFG_PR | PAS_MAC_CFG_PCFG_CE;
1146
1147	if (mac->type == MAC_TYPE_GMAC)
1148		flags |= PAS_MAC_CFG_PCFG_TSR_1G | PAS_MAC_CFG_PCFG_SPD_1G;
1149	else
1150		flags |= PAS_MAC_CFG_PCFG_TSR_10G | PAS_MAC_CFG_PCFG_SPD_10G;
1151
1152	/* Enable interface in MAC */
1153	write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1154
1155	ret = pasemi_mac_phy_init(dev);
1156	if (ret) {
1157		/* Since we won't get link notification, just enable RX */
1158		pasemi_mac_intf_enable(mac);
1159		if (mac->type == MAC_TYPE_GMAC) {
1160			/* Warn for missing PHY on SGMII (1Gig) ports */
1161			dev_warn(&mac->pdev->dev,
1162				 "PHY init failed: %d.\n", ret);
1163			dev_warn(&mac->pdev->dev,
1164				 "Defaulting to 1Gbit full duplex\n");
1165		}
1166	}
1167
1168	netif_start_queue(dev);
1169	napi_enable(&mac->napi);
1170
1171	snprintf(mac->tx_irq_name, sizeof(mac->tx_irq_name), "%s tx",
1172		 dev->name);
1173
1174	ret = request_irq(mac->tx->chan.irq, pasemi_mac_tx_intr, 0,
1175			  mac->tx_irq_name, mac->tx);
1176	if (ret) {
1177		dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1178			mac->tx->chan.irq, ret);
1179		goto out_tx_int;
1180	}
1181
1182	snprintf(mac->rx_irq_name, sizeof(mac->rx_irq_name), "%s rx",
1183		 dev->name);
1184
1185	ret = request_irq(mac->rx->chan.irq, pasemi_mac_rx_intr, 0,
1186			  mac->rx_irq_name, mac->rx);
1187	if (ret) {
1188		dev_err(&mac->pdev->dev, "request_irq of irq %d failed: %d\n",
1189			mac->rx->chan.irq, ret);
1190		goto out_rx_int;
1191	}
1192
1193	if (dev->phydev)
1194		phy_start(dev->phydev);
1195
1196	timer_setup(&mac->tx->clean_timer, pasemi_mac_tx_timer, 0);
1197	mod_timer(&mac->tx->clean_timer, jiffies + HZ);
1198
1199	return 0;
1200
1201out_rx_int:
1202	free_irq(mac->tx->chan.irq, mac->tx);
1203out_tx_int:
1204	napi_disable(&mac->napi);
1205	netif_stop_queue(dev);
1206out_tx_ring:
1207	if (mac->tx)
1208		pasemi_mac_free_tx_resources(mac);
1209	pasemi_mac_free_rx_resources(mac);
1210out_rx_resources:
1211
1212	return ret;
1213}
1214
1215#define MAX_RETRIES 5000
1216
1217static void pasemi_mac_pause_txchan(struct pasemi_mac *mac)
1218{
1219	unsigned int sta, retries;
1220	int txch = tx_ring(mac)->chan.chno;
1221
1222	write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch),
1223		      PAS_DMA_TXCHAN_TCMDSTA_ST);
1224
1225	for (retries = 0; retries < MAX_RETRIES; retries++) {
1226		sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch));
1227		if (!(sta & PAS_DMA_TXCHAN_TCMDSTA_ACT))
1228			break;
1229		cond_resched();
1230	}
1231
1232	if (sta & PAS_DMA_TXCHAN_TCMDSTA_ACT)
1233		dev_err(&mac->dma_pdev->dev,
1234			"Failed to stop tx channel, tcmdsta %08x\n", sta);
1235
1236	write_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch), 0);
1237}
1238
1239static void pasemi_mac_pause_rxchan(struct pasemi_mac *mac)
1240{
1241	unsigned int sta, retries;
1242	int rxch = rx_ring(mac)->chan.chno;
1243
1244	write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch),
1245		      PAS_DMA_RXCHAN_CCMDSTA_ST);
1246	for (retries = 0; retries < MAX_RETRIES; retries++) {
1247		sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1248		if (!(sta & PAS_DMA_RXCHAN_CCMDSTA_ACT))
1249			break;
1250		cond_resched();
1251	}
1252
1253	if (sta & PAS_DMA_RXCHAN_CCMDSTA_ACT)
1254		dev_err(&mac->dma_pdev->dev,
1255			"Failed to stop rx channel, ccmdsta 08%x\n", sta);
1256	write_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch), 0);
1257}
1258
1259static void pasemi_mac_pause_rxint(struct pasemi_mac *mac)
1260{
1261	unsigned int sta, retries;
1262
1263	write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1264		      PAS_DMA_RXINT_RCMDSTA_ST);
1265	for (retries = 0; retries < MAX_RETRIES; retries++) {
1266		sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1267		if (!(sta & PAS_DMA_RXINT_RCMDSTA_ACT))
1268			break;
1269		cond_resched();
1270	}
1271
1272	if (sta & PAS_DMA_RXINT_RCMDSTA_ACT)
1273		dev_err(&mac->dma_pdev->dev,
1274			"Failed to stop rx interface, rcmdsta %08x\n", sta);
1275	write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if), 0);
1276}
1277
1278static int pasemi_mac_close(struct net_device *dev)
1279{
1280	struct pasemi_mac *mac = netdev_priv(dev);
1281	unsigned int sta;
1282	int rxch, txch, i;
1283
1284	rxch = rx_ring(mac)->chan.chno;
1285	txch = tx_ring(mac)->chan.chno;
1286
1287	if (dev->phydev) {
1288		phy_stop(dev->phydev);
1289		phy_disconnect(dev->phydev);
1290	}
1291
1292	timer_delete_sync(&mac->tx->clean_timer);
1293
1294	netif_stop_queue(dev);
1295	napi_disable(&mac->napi);
1296
1297	sta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1298	if (sta & (PAS_DMA_RXINT_RCMDSTA_BP |
1299		      PAS_DMA_RXINT_RCMDSTA_OO |
1300		      PAS_DMA_RXINT_RCMDSTA_BT))
1301		printk(KERN_DEBUG "pasemi_mac: rcmdsta error: 0x%08x\n", sta);
1302
1303	sta = read_dma_reg(PAS_DMA_RXCHAN_CCMDSTA(rxch));
1304	if (sta & (PAS_DMA_RXCHAN_CCMDSTA_DU |
1305		     PAS_DMA_RXCHAN_CCMDSTA_OD |
1306		     PAS_DMA_RXCHAN_CCMDSTA_FD |
1307		     PAS_DMA_RXCHAN_CCMDSTA_DT))
1308		printk(KERN_DEBUG "pasemi_mac: ccmdsta error: 0x%08x\n", sta);
1309
1310	sta = read_dma_reg(PAS_DMA_TXCHAN_TCMDSTA(txch));
1311	if (sta & (PAS_DMA_TXCHAN_TCMDSTA_SZ | PAS_DMA_TXCHAN_TCMDSTA_DB |
1312		      PAS_DMA_TXCHAN_TCMDSTA_DE | PAS_DMA_TXCHAN_TCMDSTA_DA))
1313		printk(KERN_DEBUG "pasemi_mac: tcmdsta error: 0x%08x\n", sta);
1314
1315	/* Clean out any pending buffers */
1316	pasemi_mac_clean_tx(tx_ring(mac));
1317	pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
1318
1319	pasemi_mac_pause_txchan(mac);
1320	pasemi_mac_pause_rxint(mac);
1321	pasemi_mac_pause_rxchan(mac);
1322	pasemi_mac_intf_disable(mac);
1323
1324	free_irq(mac->tx->chan.irq, mac->tx);
1325	free_irq(mac->rx->chan.irq, mac->rx);
1326
1327	for (i = 0; i < mac->num_cs; i++) {
1328		pasemi_mac_free_csring(mac->cs[i]);
1329		mac->cs[i] = NULL;
1330	}
1331
1332	mac->num_cs = 0;
1333
1334	/* Free resources */
1335	pasemi_mac_free_rx_resources(mac);
1336	pasemi_mac_free_tx_resources(mac);
1337
1338	return 0;
1339}
1340
1341static void pasemi_mac_queue_csdesc(const struct sk_buff *skb,
1342				    const dma_addr_t *map,
1343				    const unsigned int *map_size,
1344				    struct pasemi_mac_txring *txring,
1345				    struct pasemi_mac_csring *csring)
1346{
1347	u64 fund;
1348	dma_addr_t cs_dest;
1349	const int nh_off = skb_network_offset(skb);
1350	const int nh_len = skb_network_header_len(skb);
1351	const int nfrags = skb_shinfo(skb)->nr_frags;
1352	int cs_size, i, fill, hdr, evt;
1353	dma_addr_t csdma;
1354
1355	fund = XCT_FUN_ST | XCT_FUN_RR_8BRES |
1356	       XCT_FUN_O | XCT_FUN_FUN(csring->fun) |
1357	       XCT_FUN_CRM_SIG | XCT_FUN_LLEN(skb->len - nh_off) |
1358	       XCT_FUN_SHL(nh_len >> 2) | XCT_FUN_SE;
1359
1360	switch (ip_hdr(skb)->protocol) {
1361	case IPPROTO_TCP:
1362		fund |= XCT_FUN_SIG_TCP4;
1363		/* TCP checksum is 16 bytes into the header */
1364		cs_dest = map[0] + skb_transport_offset(skb) + 16;
1365		break;
1366	case IPPROTO_UDP:
1367		fund |= XCT_FUN_SIG_UDP4;
1368		/* UDP checksum is 6 bytes into the header */
1369		cs_dest = map[0] + skb_transport_offset(skb) + 6;
1370		break;
1371	default:
1372		BUG();
1373	}
1374
1375	/* Do the checksum offloaded */
1376	fill = csring->next_to_fill;
1377	hdr = fill;
1378
1379	CS_DESC(csring, fill++) = fund;
1380	/* Room for 8BRES. Checksum result is really 2 bytes into it */
1381	csdma = csring->chan.ring_dma + (fill & (CS_RING_SIZE-1)) * 8 + 2;
1382	CS_DESC(csring, fill++) = 0;
1383
1384	CS_DESC(csring, fill) = XCT_PTR_LEN(map_size[0]-nh_off) | XCT_PTR_ADDR(map[0]+nh_off);
1385	for (i = 1; i <= nfrags; i++)
1386		CS_DESC(csring, fill+i) = XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1387
1388	fill += i;
1389	if (fill & 1)
1390		fill++;
1391
1392	/* Copy the result into the TCP packet */
1393	CS_DESC(csring, fill++) = XCT_FUN_O | XCT_FUN_FUN(csring->fun) |
1394				  XCT_FUN_LLEN(2) | XCT_FUN_SE;
1395	CS_DESC(csring, fill++) = XCT_PTR_LEN(2) | XCT_PTR_ADDR(cs_dest) | XCT_PTR_T;
1396	CS_DESC(csring, fill++) = XCT_PTR_LEN(2) | XCT_PTR_ADDR(csdma);
1397	fill++;
1398
1399	evt = !csring->last_event;
1400	csring->last_event = evt;
1401
1402	/* Event handshaking with MAC TX */
1403	CS_DESC(csring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
1404				  CTRL_CMD_ETYPE_SET | CTRL_CMD_REG(csring->events[evt]);
1405	CS_DESC(csring, fill++) = 0;
1406	CS_DESC(csring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
1407				  CTRL_CMD_ETYPE_WCLR | CTRL_CMD_REG(csring->events[!evt]);
1408	CS_DESC(csring, fill++) = 0;
1409	csring->next_to_fill = fill & (CS_RING_SIZE-1);
1410
1411	cs_size = fill - hdr;
1412	write_dma_reg(PAS_DMA_TXCHAN_INCR(csring->chan.chno), (cs_size) >> 1);
1413
1414	/* TX-side event handshaking */
1415	fill = txring->next_to_fill;
1416	TX_DESC(txring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
1417				  CTRL_CMD_ETYPE_WSET | CTRL_CMD_REG(csring->events[evt]);
1418	TX_DESC(txring, fill++) = 0;
1419	TX_DESC(txring, fill++) = CTRL_CMD_T | CTRL_CMD_META_EVT | CTRL_CMD_O |
1420				  CTRL_CMD_ETYPE_CLR | CTRL_CMD_REG(csring->events[!evt]);
1421	TX_DESC(txring, fill++) = 0;
1422	txring->next_to_fill = fill;
1423
1424	write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), 2);
1425}
1426
1427static netdev_tx_t pasemi_mac_start_tx(struct sk_buff *skb, struct net_device *dev)
1428{
1429	struct pasemi_mac * const mac = netdev_priv(dev);
1430	struct pasemi_mac_txring * const txring = tx_ring(mac);
1431	struct pasemi_mac_csring *csring;
1432	u64 dflags = 0;
1433	u64 mactx;
1434	dma_addr_t map[MAX_SKB_FRAGS+1];
1435	unsigned int map_size[MAX_SKB_FRAGS+1];
1436	unsigned long flags;
1437	int i, nfrags;
1438	int fill;
1439	const int nh_off = skb_network_offset(skb);
1440	const int nh_len = skb_network_header_len(skb);
1441
1442	prefetch(&txring->ring_info);
1443
1444	dflags = XCT_MACTX_O | XCT_MACTX_ST | XCT_MACTX_CRC_PAD;
1445
1446	nfrags = skb_shinfo(skb)->nr_frags;
1447
1448	map[0] = dma_map_single(&mac->dma_pdev->dev, skb->data,
1449				skb_headlen(skb), DMA_TO_DEVICE);
1450	map_size[0] = skb_headlen(skb);
1451	if (dma_mapping_error(&mac->dma_pdev->dev, map[0]))
1452		goto out_err_nolock;
1453
1454	for (i = 0; i < nfrags; i++) {
1455		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1456
1457		map[i + 1] = skb_frag_dma_map(&mac->dma_pdev->dev, frag, 0,
1458					      skb_frag_size(frag), DMA_TO_DEVICE);
1459		map_size[i+1] = skb_frag_size(frag);
1460		if (dma_mapping_error(&mac->dma_pdev->dev, map[i + 1])) {
1461			nfrags = i;
1462			goto out_err_nolock;
1463		}
1464	}
1465
1466	if (skb->ip_summed == CHECKSUM_PARTIAL && skb->len <= 1540) {
1467		switch (ip_hdr(skb)->protocol) {
1468		case IPPROTO_TCP:
1469			dflags |= XCT_MACTX_CSUM_TCP;
1470			dflags |= XCT_MACTX_IPH(nh_len >> 2);
1471			dflags |= XCT_MACTX_IPO(nh_off);
1472			break;
1473		case IPPROTO_UDP:
1474			dflags |= XCT_MACTX_CSUM_UDP;
1475			dflags |= XCT_MACTX_IPH(nh_len >> 2);
1476			dflags |= XCT_MACTX_IPO(nh_off);
1477			break;
1478		default:
1479			WARN_ON(1);
1480		}
1481	}
1482
1483	mactx = dflags | XCT_MACTX_LLEN(skb->len);
1484
1485	spin_lock_irqsave(&txring->lock, flags);
1486
1487	/* Avoid stepping on the same cache line that the DMA controller
1488	 * is currently about to send, so leave at least 8 words available.
1489	 * Total free space needed is mactx + fragments + 8
1490	 */
1491	if (RING_AVAIL(txring) < nfrags + 14) {
1492		/* no room -- stop the queue and wait for tx intr */
1493		netif_stop_queue(dev);
1494		goto out_err;
1495	}
1496
1497	/* Queue up checksum + event descriptors, if needed */
1498	if (mac->num_cs && skb->ip_summed == CHECKSUM_PARTIAL && skb->len > 1540) {
1499		csring = mac->cs[mac->last_cs];
1500		mac->last_cs = (mac->last_cs + 1) % mac->num_cs;
1501
1502		pasemi_mac_queue_csdesc(skb, map, map_size, txring, csring);
1503	}
1504
1505	fill = txring->next_to_fill;
1506	TX_DESC(txring, fill) = mactx;
1507	TX_DESC_INFO(txring, fill).dma = nfrags;
1508	fill++;
1509	TX_DESC_INFO(txring, fill).skb = skb;
1510	for (i = 0; i <= nfrags; i++) {
1511		TX_DESC(txring, fill+i) =
1512			XCT_PTR_LEN(map_size[i]) | XCT_PTR_ADDR(map[i]);
1513		TX_DESC_INFO(txring, fill+i).dma = map[i];
1514	}
1515
1516	/* We have to add an even number of 8-byte entries to the ring
1517	 * even if the last one is unused. That means always an odd number
1518	 * of pointers + one mactx descriptor.
1519	 */
1520	if (nfrags & 1)
1521		nfrags++;
1522
1523	txring->next_to_fill = (fill + nfrags + 1) & (TX_RING_SIZE-1);
1524
1525	dev->stats.tx_packets++;
1526	dev->stats.tx_bytes += skb->len;
1527
1528	spin_unlock_irqrestore(&txring->lock, flags);
1529
1530	write_dma_reg(PAS_DMA_TXCHAN_INCR(txring->chan.chno), (nfrags+2) >> 1);
1531
1532	return NETDEV_TX_OK;
1533
1534out_err:
1535	spin_unlock_irqrestore(&txring->lock, flags);
1536out_err_nolock:
1537	while (nfrags--)
1538		dma_unmap_single(&mac->dma_pdev->dev, map[nfrags],
1539				 map_size[nfrags], DMA_TO_DEVICE);
1540
1541	return NETDEV_TX_BUSY;
1542}
1543
1544static void pasemi_mac_set_rx_mode(struct net_device *dev)
1545{
1546	const struct pasemi_mac *mac = netdev_priv(dev);
1547	unsigned int flags;
1548
1549	flags = read_mac_reg(mac, PAS_MAC_CFG_PCFG);
1550
1551	/* Set promiscuous */
1552	if (dev->flags & IFF_PROMISC)
1553		flags |= PAS_MAC_CFG_PCFG_PR;
1554	else
1555		flags &= ~PAS_MAC_CFG_PCFG_PR;
1556
1557	write_mac_reg(mac, PAS_MAC_CFG_PCFG, flags);
1558}
1559
1560
1561static int pasemi_mac_poll(struct napi_struct *napi, int budget)
1562{
1563	struct pasemi_mac *mac = container_of(napi, struct pasemi_mac, napi);
1564	int pkts;
1565
1566	pasemi_mac_clean_tx(tx_ring(mac));
1567	pkts = pasemi_mac_clean_rx(rx_ring(mac), budget);
1568	if (pkts < budget) {
1569		/* all done, no more packets present */
1570		napi_complete_done(napi, pkts);
1571
1572		pasemi_mac_restart_rx_intr(mac);
1573		pasemi_mac_restart_tx_intr(mac);
1574	}
1575	return pkts;
1576}
1577
1578#ifdef CONFIG_NET_POLL_CONTROLLER
1579/*
1580 * Polling 'interrupt' - used by things like netconsole to send skbs
1581 * without having to re-enable interrupts. It's not called while
1582 * the interrupt routine is executing.
1583 */
1584static void pasemi_mac_netpoll(struct net_device *dev)
1585{
1586	const struct pasemi_mac *mac = netdev_priv(dev);
1587
1588	disable_irq(mac->tx->chan.irq);
1589	pasemi_mac_tx_intr(mac->tx->chan.irq, mac->tx);
1590	enable_irq(mac->tx->chan.irq);
1591
1592	disable_irq(mac->rx->chan.irq);
1593	pasemi_mac_rx_intr(mac->rx->chan.irq, mac->rx);
1594	enable_irq(mac->rx->chan.irq);
1595}
1596#endif
1597
1598static int pasemi_mac_change_mtu(struct net_device *dev, int new_mtu)
1599{
1600	struct pasemi_mac *mac = netdev_priv(dev);
1601	unsigned int reg;
1602	unsigned int rcmdsta = 0;
1603	int running;
1604	int ret = 0;
1605
1606	running = netif_running(dev);
1607
1608	if (running) {
1609		/* Need to stop the interface, clean out all already
1610		 * received buffers, free all unused buffers on the RX
1611		 * interface ring, then finally re-fill the rx ring with
1612		 * the new-size buffers and restart.
1613		 */
1614
1615		napi_disable(&mac->napi);
1616		netif_tx_disable(dev);
1617		pasemi_mac_intf_disable(mac);
1618
1619		rcmdsta = read_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if));
1620		pasemi_mac_pause_rxint(mac);
1621		pasemi_mac_clean_rx(rx_ring(mac), RX_RING_SIZE);
1622		pasemi_mac_free_rx_buffers(mac);
1623
1624	}
1625
1626	/* Setup checksum channels if large MTU and none already allocated */
1627	if (new_mtu > PE_DEF_MTU && !mac->num_cs) {
1628		pasemi_mac_setup_csrings(mac);
1629		if (!mac->num_cs) {
1630			ret = -ENOMEM;
1631			goto out;
1632		}
1633	}
1634
1635	/* Change maxf, i.e. what size frames are accepted.
1636	 * Need room for ethernet header and CRC word
1637	 */
1638	reg = read_mac_reg(mac, PAS_MAC_CFG_MACCFG);
1639	reg &= ~PAS_MAC_CFG_MACCFG_MAXF_M;
1640	reg |= PAS_MAC_CFG_MACCFG_MAXF(new_mtu + ETH_HLEN + 4);
1641	write_mac_reg(mac, PAS_MAC_CFG_MACCFG, reg);
1642
1643	WRITE_ONCE(dev->mtu, new_mtu);
1644	/* MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
1645	mac->bufsz = new_mtu + ETH_HLEN + ETH_FCS_LEN + LOCAL_SKB_ALIGN + 128;
1646
1647out:
1648	if (running) {
1649		write_dma_reg(PAS_DMA_RXINT_RCMDSTA(mac->dma_if),
1650			      rcmdsta | PAS_DMA_RXINT_RCMDSTA_EN);
1651
1652		rx_ring(mac)->next_to_fill = 0;
1653		pasemi_mac_replenish_rx_ring(dev, RX_RING_SIZE-1);
1654
1655		napi_enable(&mac->napi);
1656		netif_start_queue(dev);
1657		pasemi_mac_intf_enable(mac);
1658	}
1659
1660	return ret;
1661}
1662
1663static const struct net_device_ops pasemi_netdev_ops = {
1664	.ndo_open		= pasemi_mac_open,
1665	.ndo_stop		= pasemi_mac_close,
1666	.ndo_start_xmit		= pasemi_mac_start_tx,
1667	.ndo_set_rx_mode	= pasemi_mac_set_rx_mode,
1668	.ndo_set_mac_address	= pasemi_mac_set_mac_addr,
1669	.ndo_change_mtu		= pasemi_mac_change_mtu,
1670	.ndo_validate_addr	= eth_validate_addr,
1671#ifdef CONFIG_NET_POLL_CONTROLLER
1672	.ndo_poll_controller	= pasemi_mac_netpoll,
1673#endif
1674};
1675
1676static int
1677pasemi_mac_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1678{
1679	struct net_device *dev;
1680	struct pasemi_mac *mac;
1681	int err, ret;
1682
1683	err = pci_enable_device(pdev);
1684	if (err)
1685		return err;
1686
1687	dev = alloc_etherdev(sizeof(struct pasemi_mac));
1688	if (dev == NULL) {
1689		err = -ENOMEM;
1690		goto out_disable_device;
1691	}
1692
1693	pci_set_drvdata(pdev, dev);
1694	SET_NETDEV_DEV(dev, &pdev->dev);
1695
1696	mac = netdev_priv(dev);
1697
1698	mac->pdev = pdev;
1699	mac->netdev = dev;
1700
1701	netif_napi_add(dev, &mac->napi, pasemi_mac_poll);
1702
1703	dev->features = NETIF_F_IP_CSUM | NETIF_F_SG | NETIF_F_HIGHDMA |
1704			NETIF_F_GSO;
1705	dev->lltx = true;
1706
1707	mac->dma_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa007, NULL);
1708	if (!mac->dma_pdev) {
1709		dev_err(&mac->pdev->dev, "Can't find DMA Controller\n");
1710		err = -ENODEV;
1711		goto out;
1712	}
1713	dma_set_mask(&mac->dma_pdev->dev, DMA_BIT_MASK(64));
1714
1715	mac->iob_pdev = pci_get_device(PCI_VENDOR_ID_PASEMI, 0xa001, NULL);
1716	if (!mac->iob_pdev) {
1717		dev_err(&mac->pdev->dev, "Can't find I/O Bridge\n");
1718		err = -ENODEV;
1719		goto out;
1720	}
1721
1722	/* get mac addr from device tree */
1723	if (pasemi_get_mac_addr(mac) || !is_valid_ether_addr(mac->mac_addr)) {
1724		err = -ENODEV;
1725		goto out;
1726	}
1727	eth_hw_addr_set(dev, mac->mac_addr);
1728
1729	ret = mac_to_intf(mac);
1730	if (ret < 0) {
1731		dev_err(&mac->pdev->dev, "Can't map DMA interface\n");
1732		err = -ENODEV;
1733		goto out;
1734	}
1735	mac->dma_if = ret;
1736
1737	switch (pdev->device) {
1738	case 0xa005:
1739		mac->type = MAC_TYPE_GMAC;
1740		break;
1741	case 0xa006:
1742		mac->type = MAC_TYPE_XAUI;
1743		break;
1744	default:
1745		err = -ENODEV;
1746		goto out;
1747	}
1748
1749	dev->netdev_ops = &pasemi_netdev_ops;
1750	dev->mtu = PE_DEF_MTU;
1751
1752	/* MTU range: 64 - 9000 */
1753	dev->min_mtu = PE_MIN_MTU;
1754	dev->max_mtu = PE_MAX_MTU;
1755
1756	/* 1500 MTU + ETH_HLEN + VLAN_HLEN + 2 64B cachelines */
1757	mac->bufsz = dev->mtu + ETH_HLEN + ETH_FCS_LEN + LOCAL_SKB_ALIGN + 128;
1758
1759	dev->ethtool_ops = &pasemi_mac_ethtool_ops;
1760
1761	if (err)
1762		goto out;
1763
1764	mac->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
1765
1766	/* Enable most messages by default */
1767	mac->msg_enable = (NETIF_MSG_IFUP << 1 ) - 1;
1768
1769	err = register_netdev(dev);
1770
1771	if (err) {
1772		dev_err(&mac->pdev->dev, "register_netdev failed with error %d\n",
1773			err);
1774		goto out;
1775	} else if (netif_msg_probe(mac)) {
1776		printk(KERN_INFO "%s: PA Semi %s: intf %d, hw addr %pM\n",
1777		       dev->name, mac->type == MAC_TYPE_GMAC ? "GMAC" : "XAUI",
1778		       mac->dma_if, dev->dev_addr);
1779	}
1780
1781	return err;
1782
1783out:
1784	pci_dev_put(mac->iob_pdev);
1785	pci_dev_put(mac->dma_pdev);
1786
1787	free_netdev(dev);
1788out_disable_device:
1789	pci_disable_device(pdev);
1790	return err;
1791
1792}
1793
1794static void pasemi_mac_remove(struct pci_dev *pdev)
1795{
1796	struct net_device *netdev = pci_get_drvdata(pdev);
1797	struct pasemi_mac *mac;
1798
1799	if (!netdev)
1800		return;
1801
1802	mac = netdev_priv(netdev);
1803
1804	unregister_netdev(netdev);
1805
1806	pci_disable_device(pdev);
1807	pci_dev_put(mac->dma_pdev);
1808	pci_dev_put(mac->iob_pdev);
1809
1810	pasemi_dma_free_chan(&mac->tx->chan);
1811	pasemi_dma_free_chan(&mac->rx->chan);
1812
1813	free_netdev(netdev);
1814}
1815
1816static const struct pci_device_id pasemi_mac_pci_tbl[] = {
1817	{ PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa005) },
1818	{ PCI_DEVICE(PCI_VENDOR_ID_PASEMI, 0xa006) },
1819	{ },
1820};
1821
1822MODULE_DEVICE_TABLE(pci, pasemi_mac_pci_tbl);
1823
1824static struct pci_driver pasemi_mac_driver = {
1825	.name		= "pasemi_mac",
1826	.id_table	= pasemi_mac_pci_tbl,
1827	.probe		= pasemi_mac_probe,
1828	.remove		= pasemi_mac_remove,
1829};
1830
1831static void __exit pasemi_mac_cleanup_module(void)
1832{
1833	pci_unregister_driver(&pasemi_mac_driver);
1834}
1835
1836static int pasemi_mac_init_module(void)
1837{
1838	int err;
1839
1840	err = pasemi_dma_init();
1841	if (err)
1842		return err;
1843
1844	return pci_register_driver(&pasemi_mac_driver);
1845}
1846
1847module_init(pasemi_mac_init_module);
1848module_exit(pasemi_mac_cleanup_module);