1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * smc91x.c
   4 * This is a driver for SMSC's 91C9x/91C1xx single-chip Ethernet devices.
   5 *
   6 * Copyright (C) 1996 by Erik Stahlman
   7 * Copyright (C) 2001 Standard Microsystems Corporation
   8 *	Developed by Simple Network Magic Corporation
   9 * Copyright (C) 2003 Monta Vista Software, Inc.
  10 *	Unified SMC91x driver by Nicolas Pitre
  11 *
  12 * Arguments:
  13 * 	io	= for the base address
  14 *	irq	= for the IRQ
  15 *	nowait	= 0 for normal wait states, 1 eliminates additional wait states
  16 *
  17 * original author:
  18 * 	Erik Stahlman <erik@vt.edu>
  19 *
  20 * hardware multicast code:
  21 *    Peter Cammaert <pc@denkart.be>
  22 *
  23 * contributors:
  24 * 	Daris A Nevil <dnevil@snmc.com>
  25 *      Nicolas Pitre <nico@fluxnic.net>
  26 *	Russell King <rmk@arm.linux.org.uk>
  27 *
  28 * History:
  29 *   08/20/00  Arnaldo Melo       fix kfree(skb) in smc_hardware_send_packet
  30 *   12/15/00  Christian Jullien  fix "Warning: kfree_skb on hard IRQ"
  31 *   03/16/01  Daris A Nevil      modified smc9194.c for use with LAN91C111
  32 *   08/22/01  Scott Anderson     merge changes from smc9194 to smc91111
  33 *   08/21/01  Pramod B Bhardwaj  added support for RevB of LAN91C111
  34 *   12/20/01  Jeff Sutherland    initial port to Xscale PXA with DMA support
  35 *   04/07/03  Nicolas Pitre      unified SMC91x driver, killed irq races,
  36 *                                more bus abstraction, big cleanup, etc.
  37 *   29/09/03  Russell King       - add driver model support
  38 *                                - ethtool support
  39 *                                - convert to use generic MII interface
  40 *                                - add link up/down notification
  41 *                                - don't try to handle full negotiation in
  42 *                                  smc_phy_configure
  43 *                                - clean up (and fix stack overrun) in PHY
  44 *                                  MII read/write functions
  45 *   22/09/04  Nicolas Pitre      big update (see commit log for details)
  46 */
  47static const char version[] =
  48	"smc91x.c: v1.1, sep 22 2004 by Nicolas Pitre <nico@fluxnic.net>";
  49
  50/* Debugging level */
  51#ifndef SMC_DEBUG
  52#define SMC_DEBUG		0
  53#endif
  54
  55
  56#include <linux/module.h>
  57#include <linux/kernel.h>
  58#include <linux/sched.h>
  59#include <linux/delay.h>
  60#include <linux/gpio/consumer.h>
  61#include <linux/interrupt.h>
  62#include <linux/irq.h>
  63#include <linux/errno.h>
  64#include <linux/ioport.h>
  65#include <linux/crc32.h>
  66#include <linux/platform_device.h>
  67#include <linux/spinlock.h>
  68#include <linux/ethtool.h>
  69#include <linux/mii.h>
  70#include <linux/workqueue.h>
  71#include <linux/of.h>
  72#include <linux/of_device.h>
 
  73
  74#include <linux/netdevice.h>
  75#include <linux/etherdevice.h>
  76#include <linux/skbuff.h>
  77
  78#include <asm/io.h>
  79
  80#include "smc91x.h"
  81
  82#if defined(CONFIG_ASSABET_NEPONSET)
  83#include <mach/assabet.h>
  84#include <mach/neponset.h>
  85#endif
  86
  87#ifndef SMC_NOWAIT
  88# define SMC_NOWAIT		0
  89#endif
  90static int nowait = SMC_NOWAIT;
  91module_param(nowait, int, 0400);
  92MODULE_PARM_DESC(nowait, "set to 1 for no wait state");
  93
  94/*
  95 * Transmit timeout, default 5 seconds.
  96 */
  97static int watchdog = 1000;
  98module_param(watchdog, int, 0400);
  99MODULE_PARM_DESC(watchdog, "transmit timeout in milliseconds");
 100
 101MODULE_DESCRIPTION("SMC 91C9x/91C1xxx Ethernet driver");
 102MODULE_LICENSE("GPL");
 103MODULE_ALIAS("platform:smc91x");
 104
 105/*
 106 * The internal workings of the driver.  If you are changing anything
 107 * here with the SMC stuff, you should have the datasheet and know
 108 * what you are doing.
 109 */
 110#define CARDNAME "smc91x"
 111
 112/*
 113 * Use power-down feature of the chip
 114 */
 115#define POWER_DOWN		1
 116
 117/*
 118 * Wait time for memory to be free.  This probably shouldn't be
 119 * tuned that much, as waiting for this means nothing else happens
 120 * in the system
 121 */
 122#define MEMORY_WAIT_TIME	16
 123
 124/*
 125 * The maximum number of processing loops allowed for each call to the
 126 * IRQ handler.
 127 */
 128#define MAX_IRQ_LOOPS		8
 129
 130/*
 131 * This selects whether TX packets are sent one by one to the SMC91x internal
 132 * memory and throttled until transmission completes.  This may prevent
 133 * RX overruns a litle by keeping much of the memory free for RX packets
 134 * but to the expense of reduced TX throughput and increased IRQ overhead.
 135 * Note this is not a cure for a too slow data bus or too high IRQ latency.
 136 */
 137#define THROTTLE_TX_PKTS	0
 138
 139/*
 140 * The MII clock high/low times.  2x this number gives the MII clock period
 141 * in microseconds. (was 50, but this gives 6.4ms for each MII transaction!)
 142 */
 143#define MII_DELAY		1
 144
 145#define DBG(n, dev, fmt, ...)					\
 146	do {							\
 147		if (SMC_DEBUG >= (n))				\
 148			netdev_dbg(dev, fmt, ##__VA_ARGS__);	\
 149	} while (0)
 150
 151#define PRINTK(dev, fmt, ...)					\
 152	do {							\
 153		if (SMC_DEBUG > 0)				\
 154			netdev_info(dev, fmt, ##__VA_ARGS__);	\
 155		else						\
 156			netdev_dbg(dev, fmt, ##__VA_ARGS__);	\
 157	} while (0)
 158
 159#if SMC_DEBUG > 3
 160static void PRINT_PKT(u_char *buf, int length)
 161{
 162	int i;
 163	int remainder;
 164	int lines;
 165
 166	lines = length / 16;
 167	remainder = length % 16;
 168
 169	for (i = 0; i < lines ; i ++) {
 170		int cur;
 171		printk(KERN_DEBUG);
 172		for (cur = 0; cur < 8; cur++) {
 173			u_char a, b;
 174			a = *buf++;
 175			b = *buf++;
 176			pr_cont("%02x%02x ", a, b);
 177		}
 178		pr_cont("\n");
 179	}
 180	printk(KERN_DEBUG);
 181	for (i = 0; i < remainder/2 ; i++) {
 182		u_char a, b;
 183		a = *buf++;
 184		b = *buf++;
 185		pr_cont("%02x%02x ", a, b);
 186	}
 187	pr_cont("\n");
 188}
 189#else
 190static inline void PRINT_PKT(u_char *buf, int length) { }
 191#endif
 192
 193
 194/* this enables an interrupt in the interrupt mask register */
 195#define SMC_ENABLE_INT(lp, x) do {					\
 196	unsigned char mask;						\
 197	unsigned long smc_enable_flags;					\
 198	spin_lock_irqsave(&lp->lock, smc_enable_flags);			\
 199	mask = SMC_GET_INT_MASK(lp);					\
 200	mask |= (x);							\
 201	SMC_SET_INT_MASK(lp, mask);					\
 202	spin_unlock_irqrestore(&lp->lock, smc_enable_flags);		\
 203} while (0)
 204
 205/* this disables an interrupt from the interrupt mask register */
 206#define SMC_DISABLE_INT(lp, x) do {					\
 207	unsigned char mask;						\
 208	unsigned long smc_disable_flags;				\
 209	spin_lock_irqsave(&lp->lock, smc_disable_flags);		\
 210	mask = SMC_GET_INT_MASK(lp);					\
 211	mask &= ~(x);							\
 212	SMC_SET_INT_MASK(lp, mask);					\
 213	spin_unlock_irqrestore(&lp->lock, smc_disable_flags);		\
 214} while (0)
 215
 216/*
 217 * Wait while MMU is busy.  This is usually in the order of a few nanosecs
 218 * if at all, but let's avoid deadlocking the system if the hardware
 219 * decides to go south.
 220 */
 221#define SMC_WAIT_MMU_BUSY(lp) do {					\
 222	if (unlikely(SMC_GET_MMU_CMD(lp) & MC_BUSY)) {		\
 223		unsigned long timeout = jiffies + 2;			\
 224		while (SMC_GET_MMU_CMD(lp) & MC_BUSY) {		\
 225			if (time_after(jiffies, timeout)) {		\
 226				netdev_dbg(dev, "timeout %s line %d\n",	\
 227					   __FILE__, __LINE__);		\
 228				break;					\
 229			}						\
 230			cpu_relax();					\
 231		}							\
 232	}								\
 233} while (0)
 234
 235
 236/*
 237 * this does a soft reset on the device
 238 */
 239static void smc_reset(struct net_device *dev)
 240{
 241	struct smc_local *lp = netdev_priv(dev);
 242	void __iomem *ioaddr = lp->base;
 243	unsigned int ctl, cfg;
 244	struct sk_buff *pending_skb;
 245
 246	DBG(2, dev, "%s\n", __func__);
 247
 248	/* Disable all interrupts, block TX tasklet */
 249	spin_lock_irq(&lp->lock);
 250	SMC_SELECT_BANK(lp, 2);
 251	SMC_SET_INT_MASK(lp, 0);
 252	pending_skb = lp->pending_tx_skb;
 253	lp->pending_tx_skb = NULL;
 254	spin_unlock_irq(&lp->lock);
 255
 256	/* free any pending tx skb */
 257	if (pending_skb) {
 258		dev_kfree_skb(pending_skb);
 259		dev->stats.tx_errors++;
 260		dev->stats.tx_aborted_errors++;
 261	}
 262
 263	/*
 264	 * This resets the registers mostly to defaults, but doesn't
 265	 * affect EEPROM.  That seems unnecessary
 266	 */
 267	SMC_SELECT_BANK(lp, 0);
 268	SMC_SET_RCR(lp, RCR_SOFTRST);
 269
 270	/*
 271	 * Setup the Configuration Register
 272	 * This is necessary because the CONFIG_REG is not affected
 273	 * by a soft reset
 274	 */
 275	SMC_SELECT_BANK(lp, 1);
 276
 277	cfg = CONFIG_DEFAULT;
 278
 279	/*
 280	 * Setup for fast accesses if requested.  If the card/system
 281	 * can't handle it then there will be no recovery except for
 282	 * a hard reset or power cycle
 283	 */
 284	if (lp->cfg.flags & SMC91X_NOWAIT)
 285		cfg |= CONFIG_NO_WAIT;
 286
 287	/*
 288	 * Release from possible power-down state
 289	 * Configuration register is not affected by Soft Reset
 290	 */
 291	cfg |= CONFIG_EPH_POWER_EN;
 292
 293	SMC_SET_CONFIG(lp, cfg);
 294
 295	/* this should pause enough for the chip to be happy */
 296	/*
 297	 * elaborate?  What does the chip _need_? --jgarzik
 298	 *
 299	 * This seems to be undocumented, but something the original
 300	 * driver(s) have always done.  Suspect undocumented timing
 301	 * info/determined empirically. --rmk
 302	 */
 303	udelay(1);
 304
 305	/* Disable transmit and receive functionality */
 306	SMC_SELECT_BANK(lp, 0);
 307	SMC_SET_RCR(lp, RCR_CLEAR);
 308	SMC_SET_TCR(lp, TCR_CLEAR);
 309
 310	SMC_SELECT_BANK(lp, 1);
 311	ctl = SMC_GET_CTL(lp) | CTL_LE_ENABLE;
 312
 313	/*
 314	 * Set the control register to automatically release successfully
 315	 * transmitted packets, to make the best use out of our limited
 316	 * memory
 317	 */
 318	if(!THROTTLE_TX_PKTS)
 319		ctl |= CTL_AUTO_RELEASE;
 320	else
 321		ctl &= ~CTL_AUTO_RELEASE;
 322	SMC_SET_CTL(lp, ctl);
 323
 324	/* Reset the MMU */
 325	SMC_SELECT_BANK(lp, 2);
 326	SMC_SET_MMU_CMD(lp, MC_RESET);
 327	SMC_WAIT_MMU_BUSY(lp);
 328}
 329
 330/*
 331 * Enable Interrupts, Receive, and Transmit
 332 */
 333static void smc_enable(struct net_device *dev)
 334{
 335	struct smc_local *lp = netdev_priv(dev);
 336	void __iomem *ioaddr = lp->base;
 337	int mask;
 338
 339	DBG(2, dev, "%s\n", __func__);
 340
 341	/* see the header file for options in TCR/RCR DEFAULT */
 342	SMC_SELECT_BANK(lp, 0);
 343	SMC_SET_TCR(lp, lp->tcr_cur_mode);
 344	SMC_SET_RCR(lp, lp->rcr_cur_mode);
 345
 346	SMC_SELECT_BANK(lp, 1);
 347	SMC_SET_MAC_ADDR(lp, dev->dev_addr);
 348
 349	/* now, enable interrupts */
 350	mask = IM_EPH_INT|IM_RX_OVRN_INT|IM_RCV_INT;
 351	if (lp->version >= (CHIP_91100 << 4))
 352		mask |= IM_MDINT;
 353	SMC_SELECT_BANK(lp, 2);
 354	SMC_SET_INT_MASK(lp, mask);
 355
 356	/*
 357	 * From this point the register bank must _NOT_ be switched away
 358	 * to something else than bank 2 without proper locking against
 359	 * races with any tasklet or interrupt handlers until smc_shutdown()
 360	 * or smc_reset() is called.
 361	 */
 362}
 363
 364/*
 365 * this puts the device in an inactive state
 366 */
 367static void smc_shutdown(struct net_device *dev)
 368{
 369	struct smc_local *lp = netdev_priv(dev);
 370	void __iomem *ioaddr = lp->base;
 371	struct sk_buff *pending_skb;
 372
 373	DBG(2, dev, "%s: %s\n", CARDNAME, __func__);
 374
 375	/* no more interrupts for me */
 376	spin_lock_irq(&lp->lock);
 377	SMC_SELECT_BANK(lp, 2);
 378	SMC_SET_INT_MASK(lp, 0);
 379	pending_skb = lp->pending_tx_skb;
 380	lp->pending_tx_skb = NULL;
 381	spin_unlock_irq(&lp->lock);
 382	dev_kfree_skb(pending_skb);
 383
 384	/* and tell the card to stay away from that nasty outside world */
 385	SMC_SELECT_BANK(lp, 0);
 386	SMC_SET_RCR(lp, RCR_CLEAR);
 387	SMC_SET_TCR(lp, TCR_CLEAR);
 388
 389#ifdef POWER_DOWN
 390	/* finally, shut the chip down */
 391	SMC_SELECT_BANK(lp, 1);
 392	SMC_SET_CONFIG(lp, SMC_GET_CONFIG(lp) & ~CONFIG_EPH_POWER_EN);
 393#endif
 394}
 395
 396/*
 397 * This is the procedure to handle the receipt of a packet.
 398 */
 399static inline void  smc_rcv(struct net_device *dev)
 400{
 401	struct smc_local *lp = netdev_priv(dev);
 402	void __iomem *ioaddr = lp->base;
 403	unsigned int packet_number, status, packet_len;
 404
 405	DBG(3, dev, "%s\n", __func__);
 406
 407	packet_number = SMC_GET_RXFIFO(lp);
 408	if (unlikely(packet_number & RXFIFO_REMPTY)) {
 409		PRINTK(dev, "smc_rcv with nothing on FIFO.\n");
 410		return;
 411	}
 412
 413	/* read from start of packet */
 414	SMC_SET_PTR(lp, PTR_READ | PTR_RCV | PTR_AUTOINC);
 415
 416	/* First two words are status and packet length */
 417	SMC_GET_PKT_HDR(lp, status, packet_len);
 418	packet_len &= 0x07ff;  /* mask off top bits */
 419	DBG(2, dev, "RX PNR 0x%x STATUS 0x%04x LENGTH 0x%04x (%d)\n",
 420	    packet_number, status, packet_len, packet_len);
 421
 422	back:
 423	if (unlikely(packet_len < 6 || status & RS_ERRORS)) {
 424		if (status & RS_TOOLONG && packet_len <= (1514 + 4 + 6)) {
 425			/* accept VLAN packets */
 426			status &= ~RS_TOOLONG;
 427			goto back;
 428		}
 429		if (packet_len < 6) {
 430			/* bloody hardware */
 431			netdev_err(dev, "fubar (rxlen %u status %x\n",
 432				   packet_len, status);
 433			status |= RS_TOOSHORT;
 434		}
 435		SMC_WAIT_MMU_BUSY(lp);
 436		SMC_SET_MMU_CMD(lp, MC_RELEASE);
 437		dev->stats.rx_errors++;
 438		if (status & RS_ALGNERR)
 439			dev->stats.rx_frame_errors++;
 440		if (status & (RS_TOOSHORT | RS_TOOLONG))
 441			dev->stats.rx_length_errors++;
 442		if (status & RS_BADCRC)
 443			dev->stats.rx_crc_errors++;
 444	} else {
 445		struct sk_buff *skb;
 446		unsigned char *data;
 447		unsigned int data_len;
 448
 449		/* set multicast stats */
 450		if (status & RS_MULTICAST)
 451			dev->stats.multicast++;
 452
 453		/*
 454		 * Actual payload is packet_len - 6 (or 5 if odd byte).
 455		 * We want skb_reserve(2) and the final ctrl word
 456		 * (2 bytes, possibly containing the payload odd byte).
 457		 * Furthermore, we add 2 bytes to allow rounding up to
 458		 * multiple of 4 bytes on 32 bit buses.
 459		 * Hence packet_len - 6 + 2 + 2 + 2.
 460		 */
 461		skb = netdev_alloc_skb(dev, packet_len);
 462		if (unlikely(skb == NULL)) {
 463			SMC_WAIT_MMU_BUSY(lp);
 464			SMC_SET_MMU_CMD(lp, MC_RELEASE);
 465			dev->stats.rx_dropped++;
 466			return;
 467		}
 468
 469		/* Align IP header to 32 bits */
 470		skb_reserve(skb, 2);
 471
 472		/* BUG: the LAN91C111 rev A never sets this bit. Force it. */
 473		if (lp->version == 0x90)
 474			status |= RS_ODDFRAME;
 475
 476		/*
 477		 * If odd length: packet_len - 5,
 478		 * otherwise packet_len - 6.
 479		 * With the trailing ctrl byte it's packet_len - 4.
 480		 */
 481		data_len = packet_len - ((status & RS_ODDFRAME) ? 5 : 6);
 482		data = skb_put(skb, data_len);
 483		SMC_PULL_DATA(lp, data, packet_len - 4);
 484
 485		SMC_WAIT_MMU_BUSY(lp);
 486		SMC_SET_MMU_CMD(lp, MC_RELEASE);
 487
 488		PRINT_PKT(data, packet_len - 4);
 489
 490		skb->protocol = eth_type_trans(skb, dev);
 491		netif_rx(skb);
 492		dev->stats.rx_packets++;
 493		dev->stats.rx_bytes += data_len;
 494	}
 495}
 496
 497#ifdef CONFIG_SMP
 498/*
 499 * On SMP we have the following problem:
 500 *
 501 * 	A = smc_hardware_send_pkt()
 502 * 	B = smc_hard_start_xmit()
 503 * 	C = smc_interrupt()
 504 *
 505 * A and B can never be executed simultaneously.  However, at least on UP,
 506 * it is possible (and even desirable) for C to interrupt execution of
 507 * A or B in order to have better RX reliability and avoid overruns.
 508 * C, just like A and B, must have exclusive access to the chip and
 509 * each of them must lock against any other concurrent access.
 510 * Unfortunately this is not possible to have C suspend execution of A or
 511 * B taking place on another CPU. On UP this is no an issue since A and B
 512 * are run from softirq context and C from hard IRQ context, and there is
 513 * no other CPU where concurrent access can happen.
 514 * If ever there is a way to force at least B and C to always be executed
 515 * on the same CPU then we could use read/write locks to protect against
 516 * any other concurrent access and C would always interrupt B. But life
 517 * isn't that easy in a SMP world...
 518 */
 519#define smc_special_trylock(lock, flags)				\
 520({									\
 521	int __ret;							\
 522	local_irq_save(flags);						\
 523	__ret = spin_trylock(lock);					\
 524	if (!__ret)							\
 525		local_irq_restore(flags);				\
 526	__ret;								\
 527})
 528#define smc_special_lock(lock, flags)		spin_lock_irqsave(lock, flags)
 529#define smc_special_unlock(lock, flags) 	spin_unlock_irqrestore(lock, flags)
 530#else
 531#define smc_special_trylock(lock, flags)	((void)flags, true)
 532#define smc_special_lock(lock, flags)   	do { flags = 0; } while (0)
 533#define smc_special_unlock(lock, flags)	do { flags = 0; } while (0)
 534#endif
 535
 536/*
 537 * This is called to actually send a packet to the chip.
 538 */
 539static void smc_hardware_send_pkt(struct tasklet_struct *t)
 540{
 541	struct smc_local *lp = from_tasklet(lp, t, tx_task);
 542	struct net_device *dev = lp->dev;
 543	void __iomem *ioaddr = lp->base;
 544	struct sk_buff *skb;
 545	unsigned int packet_no, len;
 546	unsigned char *buf;
 547	unsigned long flags;
 548
 549	DBG(3, dev, "%s\n", __func__);
 550
 551	if (!smc_special_trylock(&lp->lock, flags)) {
 552		netif_stop_queue(dev);
 553		tasklet_schedule(&lp->tx_task);
 554		return;
 555	}
 556
 557	skb = lp->pending_tx_skb;
 558	if (unlikely(!skb)) {
 559		smc_special_unlock(&lp->lock, flags);
 560		return;
 561	}
 562	lp->pending_tx_skb = NULL;
 563
 564	packet_no = SMC_GET_AR(lp);
 565	if (unlikely(packet_no & AR_FAILED)) {
 566		netdev_err(dev, "Memory allocation failed.\n");
 567		dev->stats.tx_errors++;
 568		dev->stats.tx_fifo_errors++;
 569		smc_special_unlock(&lp->lock, flags);
 570		goto done;
 571	}
 572
 573	/* point to the beginning of the packet */
 574	SMC_SET_PN(lp, packet_no);
 575	SMC_SET_PTR(lp, PTR_AUTOINC);
 576
 577	buf = skb->data;
 578	len = skb->len;
 579	DBG(2, dev, "TX PNR 0x%x LENGTH 0x%04x (%d) BUF 0x%p\n",
 580	    packet_no, len, len, buf);
 581	PRINT_PKT(buf, len);
 582
 583	/*
 584	 * Send the packet length (+6 for status words, length, and ctl.
 585	 * The card will pad to 64 bytes with zeroes if packet is too small.
 586	 */
 587	SMC_PUT_PKT_HDR(lp, 0, len + 6);
 588
 589	/* send the actual data */
 590	SMC_PUSH_DATA(lp, buf, len & ~1);
 591
 592	/* Send final ctl word with the last byte if there is one */
 593	SMC_outw(lp, ((len & 1) ? (0x2000 | buf[len - 1]) : 0), ioaddr,
 594		 DATA_REG(lp));
 595
 596	/*
 597	 * If THROTTLE_TX_PKTS is set, we stop the queue here. This will
 598	 * have the effect of having at most one packet queued for TX
 599	 * in the chip's memory at all time.
 600	 *
 601	 * If THROTTLE_TX_PKTS is not set then the queue is stopped only
 602	 * when memory allocation (MC_ALLOC) does not succeed right away.
 603	 */
 604	if (THROTTLE_TX_PKTS)
 605		netif_stop_queue(dev);
 606
 607	/* queue the packet for TX */
 608	SMC_SET_MMU_CMD(lp, MC_ENQUEUE);
 609	smc_special_unlock(&lp->lock, flags);
 610
 611	netif_trans_update(dev);
 612	dev->stats.tx_packets++;
 613	dev->stats.tx_bytes += len;
 614
 615	SMC_ENABLE_INT(lp, IM_TX_INT | IM_TX_EMPTY_INT);
 616
 617done:	if (!THROTTLE_TX_PKTS)
 618		netif_wake_queue(dev);
 619
 620	dev_consume_skb_any(skb);
 621}
 622
 623/*
 624 * Since I am not sure if I will have enough room in the chip's ram
 625 * to store the packet, I call this routine which either sends it
 626 * now, or set the card to generates an interrupt when ready
 627 * for the packet.
 628 */
 629static netdev_tx_t
 630smc_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 631{
 632	struct smc_local *lp = netdev_priv(dev);
 633	void __iomem *ioaddr = lp->base;
 634	unsigned int numPages, poll_count, status;
 635	unsigned long flags;
 636
 637	DBG(3, dev, "%s\n", __func__);
 638
 639	BUG_ON(lp->pending_tx_skb != NULL);
 640
 641	/*
 642	 * The MMU wants the number of pages to be the number of 256 bytes
 643	 * 'pages', minus 1 (since a packet can't ever have 0 pages :))
 644	 *
 645	 * The 91C111 ignores the size bits, but earlier models don't.
 646	 *
 647	 * Pkt size for allocating is data length +6 (for additional status
 648	 * words, length and ctl)
 649	 *
 650	 * If odd size then last byte is included in ctl word.
 651	 */
 652	numPages = ((skb->len & ~1) + (6 - 1)) >> 8;
 653	if (unlikely(numPages > 7)) {
 654		netdev_warn(dev, "Far too big packet error.\n");
 655		dev->stats.tx_errors++;
 656		dev->stats.tx_dropped++;
 657		dev_kfree_skb_any(skb);
 658		return NETDEV_TX_OK;
 659	}
 660
 661	smc_special_lock(&lp->lock, flags);
 662
 663	/* now, try to allocate the memory */
 664	SMC_SET_MMU_CMD(lp, MC_ALLOC | numPages);
 665
 666	/*
 667	 * Poll the chip for a short amount of time in case the
 668	 * allocation succeeds quickly.
 669	 */
 670	poll_count = MEMORY_WAIT_TIME;
 671	do {
 672		status = SMC_GET_INT(lp);
 673		if (status & IM_ALLOC_INT) {
 674			SMC_ACK_INT(lp, IM_ALLOC_INT);
 675			break;
 676		}
 677	} while (--poll_count);
 678
 679	smc_special_unlock(&lp->lock, flags);
 680
 681	lp->pending_tx_skb = skb;
 682	if (!poll_count) {
 683		/* oh well, wait until the chip finds memory later */
 684		netif_stop_queue(dev);
 685		DBG(2, dev, "TX memory allocation deferred.\n");
 686		SMC_ENABLE_INT(lp, IM_ALLOC_INT);
 687	} else {
 688		/*
 689		 * Allocation succeeded: push packet to the chip's own memory
 690		 * immediately.
 691		 */
 692		smc_hardware_send_pkt(&lp->tx_task);
 693	}
 694
 695	return NETDEV_TX_OK;
 696}
 697
 698/*
 699 * This handles a TX interrupt, which is only called when:
 700 * - a TX error occurred, or
 701 * - CTL_AUTO_RELEASE is not set and TX of a packet completed.
 702 */
 703static void smc_tx(struct net_device *dev)
 704{
 705	struct smc_local *lp = netdev_priv(dev);
 706	void __iomem *ioaddr = lp->base;
 707	unsigned int saved_packet, packet_no, tx_status;
 708	unsigned int pkt_len __always_unused;
 709
 710	DBG(3, dev, "%s\n", __func__);
 711
 712	/* If the TX FIFO is empty then nothing to do */
 713	packet_no = SMC_GET_TXFIFO(lp);
 714	if (unlikely(packet_no & TXFIFO_TEMPTY)) {
 715		PRINTK(dev, "smc_tx with nothing on FIFO.\n");
 716		return;
 717	}
 718
 719	/* select packet to read from */
 720	saved_packet = SMC_GET_PN(lp);
 721	SMC_SET_PN(lp, packet_no);
 722
 723	/* read the first word (status word) from this packet */
 724	SMC_SET_PTR(lp, PTR_AUTOINC | PTR_READ);
 725	SMC_GET_PKT_HDR(lp, tx_status, pkt_len);
 726	DBG(2, dev, "TX STATUS 0x%04x PNR 0x%02x\n",
 727	    tx_status, packet_no);
 728
 729	if (!(tx_status & ES_TX_SUC))
 730		dev->stats.tx_errors++;
 731
 732	if (tx_status & ES_LOSTCARR)
 733		dev->stats.tx_carrier_errors++;
 734
 735	if (tx_status & (ES_LATCOL | ES_16COL)) {
 736		PRINTK(dev, "%s occurred on last xmit\n",
 737		       (tx_status & ES_LATCOL) ?
 738			"late collision" : "too many collisions");
 739		dev->stats.tx_window_errors++;
 740		if (!(dev->stats.tx_window_errors & 63) && net_ratelimit()) {
 741			netdev_info(dev, "unexpectedly large number of bad collisions. Please check duplex setting.\n");
 742		}
 743	}
 744
 745	/* kill the packet */
 746	SMC_WAIT_MMU_BUSY(lp);
 747	SMC_SET_MMU_CMD(lp, MC_FREEPKT);
 748
 749	/* Don't restore Packet Number Reg until busy bit is cleared */
 750	SMC_WAIT_MMU_BUSY(lp);
 751	SMC_SET_PN(lp, saved_packet);
 752
 753	/* re-enable transmit */
 754	SMC_SELECT_BANK(lp, 0);
 755	SMC_SET_TCR(lp, lp->tcr_cur_mode);
 756	SMC_SELECT_BANK(lp, 2);
 757}
 758
 759
 760/*---PHY CONTROL AND CONFIGURATION-----------------------------------------*/
 761
 762static void smc_mii_out(struct net_device *dev, unsigned int val, int bits)
 763{
 764	struct smc_local *lp = netdev_priv(dev);
 765	void __iomem *ioaddr = lp->base;
 766	unsigned int mii_reg, mask;
 767
 768	mii_reg = SMC_GET_MII(lp) & ~(MII_MCLK | MII_MDOE | MII_MDO);
 769	mii_reg |= MII_MDOE;
 770
 771	for (mask = 1 << (bits - 1); mask; mask >>= 1) {
 772		if (val & mask)
 773			mii_reg |= MII_MDO;
 774		else
 775			mii_reg &= ~MII_MDO;
 776
 777		SMC_SET_MII(lp, mii_reg);
 778		udelay(MII_DELAY);
 779		SMC_SET_MII(lp, mii_reg | MII_MCLK);
 780		udelay(MII_DELAY);
 781	}
 782}
 783
 784static unsigned int smc_mii_in(struct net_device *dev, int bits)
 785{
 786	struct smc_local *lp = netdev_priv(dev);
 787	void __iomem *ioaddr = lp->base;
 788	unsigned int mii_reg, mask, val;
 789
 790	mii_reg = SMC_GET_MII(lp) & ~(MII_MCLK | MII_MDOE | MII_MDO);
 791	SMC_SET_MII(lp, mii_reg);
 792
 793	for (mask = 1 << (bits - 1), val = 0; mask; mask >>= 1) {
 794		if (SMC_GET_MII(lp) & MII_MDI)
 795			val |= mask;
 796
 797		SMC_SET_MII(lp, mii_reg);
 798		udelay(MII_DELAY);
 799		SMC_SET_MII(lp, mii_reg | MII_MCLK);
 800		udelay(MII_DELAY);
 801	}
 802
 803	return val;
 804}
 805
 806/*
 807 * Reads a register from the MII Management serial interface
 808 */
 809static int smc_phy_read(struct net_device *dev, int phyaddr, int phyreg)
 810{
 811	struct smc_local *lp = netdev_priv(dev);
 812	void __iomem *ioaddr = lp->base;
 813	unsigned int phydata;
 814
 815	SMC_SELECT_BANK(lp, 3);
 816
 817	/* Idle - 32 ones */
 818	smc_mii_out(dev, 0xffffffff, 32);
 819
 820	/* Start code (01) + read (10) + phyaddr + phyreg */
 821	smc_mii_out(dev, 6 << 10 | phyaddr << 5 | phyreg, 14);
 822
 823	/* Turnaround (2bits) + phydata */
 824	phydata = smc_mii_in(dev, 18);
 825
 826	/* Return to idle state */
 827	SMC_SET_MII(lp, SMC_GET_MII(lp) & ~(MII_MCLK|MII_MDOE|MII_MDO));
 828
 829	DBG(3, dev, "%s: phyaddr=0x%x, phyreg=0x%x, phydata=0x%x\n",
 830	    __func__, phyaddr, phyreg, phydata);
 831
 832	SMC_SELECT_BANK(lp, 2);
 833	return phydata;
 834}
 835
 836/*
 837 * Writes a register to the MII Management serial interface
 838 */
 839static void smc_phy_write(struct net_device *dev, int phyaddr, int phyreg,
 840			  int phydata)
 841{
 842	struct smc_local *lp = netdev_priv(dev);
 843	void __iomem *ioaddr = lp->base;
 844
 845	SMC_SELECT_BANK(lp, 3);
 846
 847	/* Idle - 32 ones */
 848	smc_mii_out(dev, 0xffffffff, 32);
 849
 850	/* Start code (01) + write (01) + phyaddr + phyreg + turnaround + phydata */
 851	smc_mii_out(dev, 5 << 28 | phyaddr << 23 | phyreg << 18 | 2 << 16 | phydata, 32);
 852
 853	/* Return to idle state */
 854	SMC_SET_MII(lp, SMC_GET_MII(lp) & ~(MII_MCLK|MII_MDOE|MII_MDO));
 855
 856	DBG(3, dev, "%s: phyaddr=0x%x, phyreg=0x%x, phydata=0x%x\n",
 857	    __func__, phyaddr, phyreg, phydata);
 858
 859	SMC_SELECT_BANK(lp, 2);
 860}
 861
 862/*
 863 * Finds and reports the PHY address
 864 */
 865static void smc_phy_detect(struct net_device *dev)
 866{
 867	struct smc_local *lp = netdev_priv(dev);
 868	int phyaddr;
 869
 870	DBG(2, dev, "%s\n", __func__);
 871
 872	lp->phy_type = 0;
 873
 874	/*
 875	 * Scan all 32 PHY addresses if necessary, starting at
 876	 * PHY#1 to PHY#31, and then PHY#0 last.
 877	 */
 878	for (phyaddr = 1; phyaddr < 33; ++phyaddr) {
 879		unsigned int id1, id2;
 880
 881		/* Read the PHY identifiers */
 882		id1 = smc_phy_read(dev, phyaddr & 31, MII_PHYSID1);
 883		id2 = smc_phy_read(dev, phyaddr & 31, MII_PHYSID2);
 884
 885		DBG(3, dev, "phy_id1=0x%x, phy_id2=0x%x\n",
 886		    id1, id2);
 887
 888		/* Make sure it is a valid identifier */
 889		if (id1 != 0x0000 && id1 != 0xffff && id1 != 0x8000 &&
 890		    id2 != 0x0000 && id2 != 0xffff && id2 != 0x8000) {
 891			/* Save the PHY's address */
 892			lp->mii.phy_id = phyaddr & 31;
 893			lp->phy_type = id1 << 16 | id2;
 894			break;
 895		}
 896	}
 897}
 898
 899/*
 900 * Sets the PHY to a configuration as determined by the user
 901 */
 902static int smc_phy_fixed(struct net_device *dev)
 903{
 904	struct smc_local *lp = netdev_priv(dev);
 905	void __iomem *ioaddr = lp->base;
 906	int phyaddr = lp->mii.phy_id;
 907	int bmcr, cfg1;
 908
 909	DBG(3, dev, "%s\n", __func__);
 910
 911	/* Enter Link Disable state */
 912	cfg1 = smc_phy_read(dev, phyaddr, PHY_CFG1_REG);
 913	cfg1 |= PHY_CFG1_LNKDIS;
 914	smc_phy_write(dev, phyaddr, PHY_CFG1_REG, cfg1);
 915
 916	/*
 917	 * Set our fixed capabilities
 918	 * Disable auto-negotiation
 919	 */
 920	bmcr = 0;
 921
 922	if (lp->ctl_rfduplx)
 923		bmcr |= BMCR_FULLDPLX;
 924
 925	if (lp->ctl_rspeed == 100)
 926		bmcr |= BMCR_SPEED100;
 927
 928	/* Write our capabilities to the phy control register */
 929	smc_phy_write(dev, phyaddr, MII_BMCR, bmcr);
 930
 931	/* Re-Configure the Receive/Phy Control register */
 932	SMC_SELECT_BANK(lp, 0);
 933	SMC_SET_RPC(lp, lp->rpc_cur_mode);
 934	SMC_SELECT_BANK(lp, 2);
 935
 936	return 1;
 937}
 938
 939/**
 940 * smc_phy_reset - reset the phy
 941 * @dev: net device
 942 * @phy: phy address
 943 *
 944 * Issue a software reset for the specified PHY and
 945 * wait up to 100ms for the reset to complete.  We should
 946 * not access the PHY for 50ms after issuing the reset.
 947 *
 948 * The time to wait appears to be dependent on the PHY.
 949 *
 950 * Must be called with lp->lock locked.
 951 */
 952static int smc_phy_reset(struct net_device *dev, int phy)
 953{
 954	struct smc_local *lp = netdev_priv(dev);
 955	unsigned int bmcr;
 956	int timeout;
 957
 958	smc_phy_write(dev, phy, MII_BMCR, BMCR_RESET);
 959
 960	for (timeout = 2; timeout; timeout--) {
 961		spin_unlock_irq(&lp->lock);
 962		msleep(50);
 963		spin_lock_irq(&lp->lock);
 964
 965		bmcr = smc_phy_read(dev, phy, MII_BMCR);
 966		if (!(bmcr & BMCR_RESET))
 967			break;
 968	}
 969
 970	return bmcr & BMCR_RESET;
 971}
 972
 973/**
 974 * smc_phy_powerdown - powerdown phy
 975 * @dev: net device
 976 *
 977 * Power down the specified PHY
 978 */
 979static void smc_phy_powerdown(struct net_device *dev)
 980{
 981	struct smc_local *lp = netdev_priv(dev);
 982	unsigned int bmcr;
 983	int phy = lp->mii.phy_id;
 984
 985	if (lp->phy_type == 0)
 986		return;
 987
 988	/* We need to ensure that no calls to smc_phy_configure are
 989	   pending.
 990	*/
 991	cancel_work_sync(&lp->phy_configure);
 992
 993	bmcr = smc_phy_read(dev, phy, MII_BMCR);
 994	smc_phy_write(dev, phy, MII_BMCR, bmcr | BMCR_PDOWN);
 995}
 996
 997/**
 998 * smc_phy_check_media - check the media status and adjust TCR
 999 * @dev: net device
1000 * @init: set true for initialisation
1001 *
1002 * Select duplex mode depending on negotiation state.  This
1003 * also updates our carrier state.
1004 */
1005static void smc_phy_check_media(struct net_device *dev, int init)
1006{
1007	struct smc_local *lp = netdev_priv(dev);
1008	void __iomem *ioaddr = lp->base;
1009
1010	if (mii_check_media(&lp->mii, netif_msg_link(lp), init)) {
1011		/* duplex state has changed */
1012		if (lp->mii.full_duplex) {
1013			lp->tcr_cur_mode |= TCR_SWFDUP;
1014		} else {
1015			lp->tcr_cur_mode &= ~TCR_SWFDUP;
1016		}
1017
1018		SMC_SELECT_BANK(lp, 0);
1019		SMC_SET_TCR(lp, lp->tcr_cur_mode);
1020	}
1021}
1022
1023/*
1024 * Configures the specified PHY through the MII management interface
1025 * using Autonegotiation.
1026 * Calls smc_phy_fixed() if the user has requested a certain config.
1027 * If RPC ANEG bit is set, the media selection is dependent purely on
1028 * the selection by the MII (either in the MII BMCR reg or the result
1029 * of autonegotiation.)  If the RPC ANEG bit is cleared, the selection
1030 * is controlled by the RPC SPEED and RPC DPLX bits.
1031 */
1032static void smc_phy_configure(struct work_struct *work)
1033{
1034	struct smc_local *lp =
1035		container_of(work, struct smc_local, phy_configure);
1036	struct net_device *dev = lp->dev;
1037	void __iomem *ioaddr = lp->base;
1038	int phyaddr = lp->mii.phy_id;
1039	int my_phy_caps; /* My PHY capabilities */
1040	int my_ad_caps; /* My Advertised capabilities */
 
1041
1042	DBG(3, dev, "smc_program_phy()\n");
1043
1044	spin_lock_irq(&lp->lock);
1045
1046	/*
1047	 * We should not be called if phy_type is zero.
1048	 */
1049	if (lp->phy_type == 0)
1050		goto smc_phy_configure_exit;
1051
1052	if (smc_phy_reset(dev, phyaddr)) {
1053		netdev_info(dev, "PHY reset timed out\n");
1054		goto smc_phy_configure_exit;
1055	}
1056
1057	/*
1058	 * Enable PHY Interrupts (for register 18)
1059	 * Interrupts listed here are disabled
1060	 */
1061	smc_phy_write(dev, phyaddr, PHY_MASK_REG,
1062		PHY_INT_LOSSSYNC | PHY_INT_CWRD | PHY_INT_SSD |
1063		PHY_INT_ESD | PHY_INT_RPOL | PHY_INT_JAB |
1064		PHY_INT_SPDDET | PHY_INT_DPLXDET);
1065
1066	/* Configure the Receive/Phy Control register */
1067	SMC_SELECT_BANK(lp, 0);
1068	SMC_SET_RPC(lp, lp->rpc_cur_mode);
1069
1070	/* If the user requested no auto neg, then go set his request */
1071	if (lp->mii.force_media) {
1072		smc_phy_fixed(dev);
1073		goto smc_phy_configure_exit;
1074	}
1075
1076	/* Copy our capabilities from MII_BMSR to MII_ADVERTISE */
1077	my_phy_caps = smc_phy_read(dev, phyaddr, MII_BMSR);
1078
1079	if (!(my_phy_caps & BMSR_ANEGCAPABLE)) {
1080		netdev_info(dev, "Auto negotiation NOT supported\n");
1081		smc_phy_fixed(dev);
1082		goto smc_phy_configure_exit;
1083	}
1084
1085	my_ad_caps = ADVERTISE_CSMA; /* I am CSMA capable */
1086
1087	if (my_phy_caps & BMSR_100BASE4)
1088		my_ad_caps |= ADVERTISE_100BASE4;
1089	if (my_phy_caps & BMSR_100FULL)
1090		my_ad_caps |= ADVERTISE_100FULL;
1091	if (my_phy_caps & BMSR_100HALF)
1092		my_ad_caps |= ADVERTISE_100HALF;
1093	if (my_phy_caps & BMSR_10FULL)
1094		my_ad_caps |= ADVERTISE_10FULL;
1095	if (my_phy_caps & BMSR_10HALF)
1096		my_ad_caps |= ADVERTISE_10HALF;
1097
1098	/* Disable capabilities not selected by our user */
1099	if (lp->ctl_rspeed != 100)
1100		my_ad_caps &= ~(ADVERTISE_100BASE4|ADVERTISE_100FULL|ADVERTISE_100HALF);
1101
1102	if (!lp->ctl_rfduplx)
1103		my_ad_caps &= ~(ADVERTISE_100FULL|ADVERTISE_10FULL);
1104
1105	/* Update our Auto-Neg Advertisement Register */
1106	smc_phy_write(dev, phyaddr, MII_ADVERTISE, my_ad_caps);
1107	lp->mii.advertising = my_ad_caps;
1108
1109	/*
1110	 * Read the register back.  Without this, it appears that when
1111	 * auto-negotiation is restarted, sometimes it isn't ready and
1112	 * the link does not come up.
1113	 */
1114	smc_phy_read(dev, phyaddr, MII_ADVERTISE);
1115
1116	DBG(2, dev, "phy caps=%x\n", my_phy_caps);
1117	DBG(2, dev, "phy advertised caps=%x\n", my_ad_caps);
1118
1119	/* Restart auto-negotiation process in order to advertise my caps */
1120	smc_phy_write(dev, phyaddr, MII_BMCR, BMCR_ANENABLE | BMCR_ANRESTART);
1121
1122	smc_phy_check_media(dev, 1);
1123
1124smc_phy_configure_exit:
1125	SMC_SELECT_BANK(lp, 2);
1126	spin_unlock_irq(&lp->lock);
1127}
1128
1129/*
1130 * smc_phy_interrupt
1131 *
1132 * Purpose:  Handle interrupts relating to PHY register 18. This is
1133 *  called from the "hard" interrupt handler under our private spinlock.
1134 */
1135static void smc_phy_interrupt(struct net_device *dev)
1136{
1137	struct smc_local *lp = netdev_priv(dev);
1138	int phyaddr = lp->mii.phy_id;
1139	int phy18;
1140
1141	DBG(2, dev, "%s\n", __func__);
1142
1143	if (lp->phy_type == 0)
1144		return;
1145
1146	for(;;) {
1147		smc_phy_check_media(dev, 0);
1148
1149		/* Read PHY Register 18, Status Output */
1150		phy18 = smc_phy_read(dev, phyaddr, PHY_INT_REG);
1151		if ((phy18 & PHY_INT_INT) == 0)
1152			break;
1153	}
1154}
1155
1156/*--- END PHY CONTROL AND CONFIGURATION-------------------------------------*/
1157
1158static void smc_10bt_check_media(struct net_device *dev, int init)
1159{
1160	struct smc_local *lp = netdev_priv(dev);
1161	void __iomem *ioaddr = lp->base;
1162	unsigned int old_carrier, new_carrier;
1163
1164	old_carrier = netif_carrier_ok(dev) ? 1 : 0;
1165
1166	SMC_SELECT_BANK(lp, 0);
1167	new_carrier = (SMC_GET_EPH_STATUS(lp) & ES_LINK_OK) ? 1 : 0;
1168	SMC_SELECT_BANK(lp, 2);
1169
1170	if (init || (old_carrier != new_carrier)) {
1171		if (!new_carrier) {
1172			netif_carrier_off(dev);
1173		} else {
1174			netif_carrier_on(dev);
1175		}
1176		if (netif_msg_link(lp))
1177			netdev_info(dev, "link %s\n",
1178				    new_carrier ? "up" : "down");
1179	}
1180}
1181
1182static void smc_eph_interrupt(struct net_device *dev)
1183{
1184	struct smc_local *lp = netdev_priv(dev);
1185	void __iomem *ioaddr = lp->base;
1186	unsigned int ctl;
1187
1188	smc_10bt_check_media(dev, 0);
1189
1190	SMC_SELECT_BANK(lp, 1);
1191	ctl = SMC_GET_CTL(lp);
1192	SMC_SET_CTL(lp, ctl & ~CTL_LE_ENABLE);
1193	SMC_SET_CTL(lp, ctl);
1194	SMC_SELECT_BANK(lp, 2);
1195}
1196
1197/*
1198 * This is the main routine of the driver, to handle the device when
1199 * it needs some attention.
1200 */
1201static irqreturn_t smc_interrupt(int irq, void *dev_id)
1202{
1203	struct net_device *dev = dev_id;
1204	struct smc_local *lp = netdev_priv(dev);
1205	void __iomem *ioaddr = lp->base;
1206	int status, mask, timeout, card_stats;
1207	int saved_pointer;
1208
1209	DBG(3, dev, "%s\n", __func__);
1210
1211	spin_lock(&lp->lock);
1212
1213	/* A preamble may be used when there is a potential race
1214	 * between the interruptible transmit functions and this
1215	 * ISR. */
1216	SMC_INTERRUPT_PREAMBLE;
1217
1218	saved_pointer = SMC_GET_PTR(lp);
1219	mask = SMC_GET_INT_MASK(lp);
1220	SMC_SET_INT_MASK(lp, 0);
1221
1222	/* set a timeout value, so I don't stay here forever */
1223	timeout = MAX_IRQ_LOOPS;
1224
1225	do {
1226		status = SMC_GET_INT(lp);
1227
1228		DBG(2, dev, "INT 0x%02x MASK 0x%02x MEM 0x%04x FIFO 0x%04x\n",
1229		    status, mask,
1230		    ({ int meminfo; SMC_SELECT_BANK(lp, 0);
1231		       meminfo = SMC_GET_MIR(lp);
1232		       SMC_SELECT_BANK(lp, 2); meminfo; }),
1233		    SMC_GET_FIFO(lp));
1234
1235		status &= mask;
1236		if (!status)
1237			break;
1238
1239		if (status & IM_TX_INT) {
1240			/* do this before RX as it will free memory quickly */
1241			DBG(3, dev, "TX int\n");
1242			smc_tx(dev);
1243			SMC_ACK_INT(lp, IM_TX_INT);
1244			if (THROTTLE_TX_PKTS)
1245				netif_wake_queue(dev);
1246		} else if (status & IM_RCV_INT) {
1247			DBG(3, dev, "RX irq\n");
1248			smc_rcv(dev);
1249		} else if (status & IM_ALLOC_INT) {
1250			DBG(3, dev, "Allocation irq\n");
1251			tasklet_hi_schedule(&lp->tx_task);
1252			mask &= ~IM_ALLOC_INT;
1253		} else if (status & IM_TX_EMPTY_INT) {
1254			DBG(3, dev, "TX empty\n");
1255			mask &= ~IM_TX_EMPTY_INT;
1256
1257			/* update stats */
1258			SMC_SELECT_BANK(lp, 0);
1259			card_stats = SMC_GET_COUNTER(lp);
1260			SMC_SELECT_BANK(lp, 2);
1261
1262			/* single collisions */
1263			dev->stats.collisions += card_stats & 0xF;
1264			card_stats >>= 4;
1265
1266			/* multiple collisions */
1267			dev->stats.collisions += card_stats & 0xF;
1268		} else if (status & IM_RX_OVRN_INT) {
1269			DBG(1, dev, "RX overrun (EPH_ST 0x%04x)\n",
1270			    ({ int eph_st; SMC_SELECT_BANK(lp, 0);
1271			       eph_st = SMC_GET_EPH_STATUS(lp);
1272			       SMC_SELECT_BANK(lp, 2); eph_st; }));
1273			SMC_ACK_INT(lp, IM_RX_OVRN_INT);
1274			dev->stats.rx_errors++;
1275			dev->stats.rx_fifo_errors++;
1276		} else if (status & IM_EPH_INT) {
1277			smc_eph_interrupt(dev);
1278		} else if (status & IM_MDINT) {
1279			SMC_ACK_INT(lp, IM_MDINT);
1280			smc_phy_interrupt(dev);
1281		} else if (status & IM_ERCV_INT) {
1282			SMC_ACK_INT(lp, IM_ERCV_INT);
1283			PRINTK(dev, "UNSUPPORTED: ERCV INTERRUPT\n");
1284		}
1285	} while (--timeout);
1286
1287	/* restore register states */
1288	SMC_SET_PTR(lp, saved_pointer);
1289	SMC_SET_INT_MASK(lp, mask);
1290	spin_unlock(&lp->lock);
1291
1292#ifndef CONFIG_NET_POLL_CONTROLLER
1293	if (timeout == MAX_IRQ_LOOPS)
1294		PRINTK(dev, "spurious interrupt (mask = 0x%02x)\n",
1295		       mask);
1296#endif
1297	DBG(3, dev, "Interrupt done (%d loops)\n",
1298	    MAX_IRQ_LOOPS - timeout);
1299
1300	/*
1301	 * We return IRQ_HANDLED unconditionally here even if there was
1302	 * nothing to do.  There is a possibility that a packet might
1303	 * get enqueued into the chip right after TX_EMPTY_INT is raised
1304	 * but just before the CPU acknowledges the IRQ.
1305	 * Better take an unneeded IRQ in some occasions than complexifying
1306	 * the code for all cases.
1307	 */
1308	return IRQ_HANDLED;
1309}
1310
1311#ifdef CONFIG_NET_POLL_CONTROLLER
1312/*
1313 * Polling receive - used by netconsole and other diagnostic tools
1314 * to allow network i/o with interrupts disabled.
1315 */
1316static void smc_poll_controller(struct net_device *dev)
1317{
1318	disable_irq(dev->irq);
1319	smc_interrupt(dev->irq, dev);
1320	enable_irq(dev->irq);
1321}
1322#endif
1323
1324/* Our watchdog timed out. Called by the networking layer */
1325static void smc_timeout(struct net_device *dev, unsigned int txqueue)
1326{
1327	struct smc_local *lp = netdev_priv(dev);
1328	void __iomem *ioaddr = lp->base;
1329	int status, mask, eph_st, meminfo, fifo;
1330
1331	DBG(2, dev, "%s\n", __func__);
1332
1333	spin_lock_irq(&lp->lock);
1334	status = SMC_GET_INT(lp);
1335	mask = SMC_GET_INT_MASK(lp);
1336	fifo = SMC_GET_FIFO(lp);
1337	SMC_SELECT_BANK(lp, 0);
1338	eph_st = SMC_GET_EPH_STATUS(lp);
1339	meminfo = SMC_GET_MIR(lp);
1340	SMC_SELECT_BANK(lp, 2);
1341	spin_unlock_irq(&lp->lock);
1342	PRINTK(dev, "TX timeout (INT 0x%02x INTMASK 0x%02x MEM 0x%04x FIFO 0x%04x EPH_ST 0x%04x)\n",
1343	       status, mask, meminfo, fifo, eph_st);
1344
1345	smc_reset(dev);
1346	smc_enable(dev);
1347
1348	/*
1349	 * Reconfiguring the PHY doesn't seem like a bad idea here, but
1350	 * smc_phy_configure() calls msleep() which calls schedule_timeout()
1351	 * which calls schedule().  Hence we use a work queue.
1352	 */
1353	if (lp->phy_type != 0)
1354		schedule_work(&lp->phy_configure);
1355
1356	/* We can accept TX packets again */
1357	netif_trans_update(dev); /* prevent tx timeout */
1358	netif_wake_queue(dev);
1359}
1360
1361/*
1362 * This routine will, depending on the values passed to it,
1363 * either make it accept multicast packets, go into
1364 * promiscuous mode (for TCPDUMP and cousins) or accept
1365 * a select set of multicast packets
1366 */
1367static void smc_set_multicast_list(struct net_device *dev)
1368{
1369	struct smc_local *lp = netdev_priv(dev);
1370	void __iomem *ioaddr = lp->base;
1371	unsigned char multicast_table[8];
1372	int update_multicast = 0;
1373
1374	DBG(2, dev, "%s\n", __func__);
1375
1376	if (dev->flags & IFF_PROMISC) {
1377		DBG(2, dev, "RCR_PRMS\n");
1378		lp->rcr_cur_mode |= RCR_PRMS;
1379	}
1380
1381/* BUG?  I never disable promiscuous mode if multicasting was turned on.
1382   Now, I turn off promiscuous mode, but I don't do anything to multicasting
1383   when promiscuous mode is turned on.
1384*/
1385
1386	/*
1387	 * Here, I am setting this to accept all multicast packets.
1388	 * I don't need to zero the multicast table, because the flag is
1389	 * checked before the table is
1390	 */
1391	else if (dev->flags & IFF_ALLMULTI || netdev_mc_count(dev) > 16) {
1392		DBG(2, dev, "RCR_ALMUL\n");
1393		lp->rcr_cur_mode |= RCR_ALMUL;
1394	}
1395
1396	/*
1397	 * This sets the internal hardware table to filter out unwanted
1398	 * multicast packets before they take up memory.
1399	 *
1400	 * The SMC chip uses a hash table where the high 6 bits of the CRC of
1401	 * address are the offset into the table.  If that bit is 1, then the
1402	 * multicast packet is accepted.  Otherwise, it's dropped silently.
1403	 *
1404	 * To use the 6 bits as an offset into the table, the high 3 bits are
1405	 * the number of the 8 bit register, while the low 3 bits are the bit
1406	 * within that register.
1407	 */
1408	else if (!netdev_mc_empty(dev)) {
1409		struct netdev_hw_addr *ha;
1410
1411		/* table for flipping the order of 3 bits */
1412		static const unsigned char invert3[] = {0, 4, 2, 6, 1, 5, 3, 7};
1413
1414		/* start with a table of all zeros: reject all */
1415		memset(multicast_table, 0, sizeof(multicast_table));
1416
1417		netdev_for_each_mc_addr(ha, dev) {
1418			int position;
1419
1420			/* only use the low order bits */
1421			position = crc32_le(~0, ha->addr, 6) & 0x3f;
1422
1423			/* do some messy swapping to put the bit in the right spot */
1424			multicast_table[invert3[position&7]] |=
1425				(1<<invert3[(position>>3)&7]);
1426		}
1427
1428		/* be sure I get rid of flags I might have set */
1429		lp->rcr_cur_mode &= ~(RCR_PRMS | RCR_ALMUL);
1430
1431		/* now, the table can be loaded into the chipset */
1432		update_multicast = 1;
1433	} else  {
1434		DBG(2, dev, "~(RCR_PRMS|RCR_ALMUL)\n");
1435		lp->rcr_cur_mode &= ~(RCR_PRMS | RCR_ALMUL);
1436
1437		/*
1438		 * since I'm disabling all multicast entirely, I need to
1439		 * clear the multicast list
1440		 */
1441		memset(multicast_table, 0, sizeof(multicast_table));
1442		update_multicast = 1;
1443	}
1444
1445	spin_lock_irq(&lp->lock);
1446	SMC_SELECT_BANK(lp, 0);
1447	SMC_SET_RCR(lp, lp->rcr_cur_mode);
1448	if (update_multicast) {
1449		SMC_SELECT_BANK(lp, 3);
1450		SMC_SET_MCAST(lp, multicast_table);
1451	}
1452	SMC_SELECT_BANK(lp, 2);
1453	spin_unlock_irq(&lp->lock);
1454}
1455
1456
1457/*
1458 * Open and Initialize the board
1459 *
1460 * Set up everything, reset the card, etc..
1461 */
1462static int
1463smc_open(struct net_device *dev)
1464{
1465	struct smc_local *lp = netdev_priv(dev);
1466
1467	DBG(2, dev, "%s\n", __func__);
1468
1469	/* Setup the default Register Modes */
1470	lp->tcr_cur_mode = TCR_DEFAULT;
1471	lp->rcr_cur_mode = RCR_DEFAULT;
1472	lp->rpc_cur_mode = RPC_DEFAULT |
1473				lp->cfg.leda << RPC_LSXA_SHFT |
1474				lp->cfg.ledb << RPC_LSXB_SHFT;
1475
1476	/*
1477	 * If we are not using a MII interface, we need to
1478	 * monitor our own carrier signal to detect faults.
1479	 */
1480	if (lp->phy_type == 0)
1481		lp->tcr_cur_mode |= TCR_MON_CSN;
1482
1483	/* reset the hardware */
1484	smc_reset(dev);
1485	smc_enable(dev);
1486
1487	/* Configure the PHY, initialize the link state */
1488	if (lp->phy_type != 0)
1489		smc_phy_configure(&lp->phy_configure);
1490	else {
1491		spin_lock_irq(&lp->lock);
1492		smc_10bt_check_media(dev, 1);
1493		spin_unlock_irq(&lp->lock);
1494	}
1495
1496	netif_start_queue(dev);
1497	return 0;
1498}
1499
1500/*
1501 * smc_close
1502 *
1503 * this makes the board clean up everything that it can
1504 * and not talk to the outside world.   Caused by
1505 * an 'ifconfig ethX down'
1506 */
1507static int smc_close(struct net_device *dev)
1508{
1509	struct smc_local *lp = netdev_priv(dev);
1510
1511	DBG(2, dev, "%s\n", __func__);
1512
1513	netif_stop_queue(dev);
1514	netif_carrier_off(dev);
1515
1516	/* clear everything */
1517	smc_shutdown(dev);
1518	tasklet_kill(&lp->tx_task);
1519	smc_phy_powerdown(dev);
1520	return 0;
1521}
1522
1523/*
1524 * Ethtool support
1525 */
1526static int
1527smc_ethtool_get_link_ksettings(struct net_device *dev,
1528			       struct ethtool_link_ksettings *cmd)
1529{
1530	struct smc_local *lp = netdev_priv(dev);
1531
1532	if (lp->phy_type != 0) {
1533		spin_lock_irq(&lp->lock);
1534		mii_ethtool_get_link_ksettings(&lp->mii, cmd);
1535		spin_unlock_irq(&lp->lock);
1536	} else {
1537		u32 supported = SUPPORTED_10baseT_Half |
1538				 SUPPORTED_10baseT_Full |
1539				 SUPPORTED_TP | SUPPORTED_AUI;
1540
1541		if (lp->ctl_rspeed == 10)
1542			cmd->base.speed = SPEED_10;
1543		else if (lp->ctl_rspeed == 100)
1544			cmd->base.speed = SPEED_100;
1545
1546		cmd->base.autoneg = AUTONEG_DISABLE;
1547		cmd->base.port = 0;
1548		cmd->base.duplex = lp->tcr_cur_mode & TCR_SWFDUP ?
1549			DUPLEX_FULL : DUPLEX_HALF;
1550
1551		ethtool_convert_legacy_u32_to_link_mode(
1552			cmd->link_modes.supported, supported);
1553	}
1554
1555	return 0;
1556}
1557
1558static int
1559smc_ethtool_set_link_ksettings(struct net_device *dev,
1560			       const struct ethtool_link_ksettings *cmd)
1561{
1562	struct smc_local *lp = netdev_priv(dev);
1563	int ret;
1564
1565	if (lp->phy_type != 0) {
1566		spin_lock_irq(&lp->lock);
1567		ret = mii_ethtool_set_link_ksettings(&lp->mii, cmd);
1568		spin_unlock_irq(&lp->lock);
1569	} else {
1570		if (cmd->base.autoneg != AUTONEG_DISABLE ||
1571		    cmd->base.speed != SPEED_10 ||
1572		    (cmd->base.duplex != DUPLEX_HALF &&
1573		     cmd->base.duplex != DUPLEX_FULL) ||
1574		    (cmd->base.port != PORT_TP && cmd->base.port != PORT_AUI))
1575			return -EINVAL;
1576
 
1577		lp->ctl_rfduplx = cmd->base.duplex == DUPLEX_FULL;
1578
 
 
 
1579		ret = 0;
1580	}
1581
1582	return ret;
1583}
1584
1585static void
1586smc_ethtool_getdrvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
1587{
1588	strscpy(info->driver, CARDNAME, sizeof(info->driver));
1589	strscpy(info->version, version, sizeof(info->version));
1590	strscpy(info->bus_info, dev_name(dev->dev.parent),
1591		sizeof(info->bus_info));
1592}
1593
1594static int smc_ethtool_nwayreset(struct net_device *dev)
1595{
1596	struct smc_local *lp = netdev_priv(dev);
1597	int ret = -EINVAL;
1598
1599	if (lp->phy_type != 0) {
1600		spin_lock_irq(&lp->lock);
1601		ret = mii_nway_restart(&lp->mii);
1602		spin_unlock_irq(&lp->lock);
1603	}
1604
1605	return ret;
1606}
1607
1608static u32 smc_ethtool_getmsglevel(struct net_device *dev)
1609{
1610	struct smc_local *lp = netdev_priv(dev);
1611	return lp->msg_enable;
1612}
1613
1614static void smc_ethtool_setmsglevel(struct net_device *dev, u32 level)
1615{
1616	struct smc_local *lp = netdev_priv(dev);
1617	lp->msg_enable = level;
1618}
1619
1620static int smc_write_eeprom_word(struct net_device *dev, u16 addr, u16 word)
1621{
1622	u16 ctl;
1623	struct smc_local *lp = netdev_priv(dev);
1624	void __iomem *ioaddr = lp->base;
1625
1626	spin_lock_irq(&lp->lock);
1627	/* load word into GP register */
1628	SMC_SELECT_BANK(lp, 1);
1629	SMC_SET_GP(lp, word);
1630	/* set the address to put the data in EEPROM */
1631	SMC_SELECT_BANK(lp, 2);
1632	SMC_SET_PTR(lp, addr);
1633	/* tell it to write */
1634	SMC_SELECT_BANK(lp, 1);
1635	ctl = SMC_GET_CTL(lp);
1636	SMC_SET_CTL(lp, ctl | (CTL_EEPROM_SELECT | CTL_STORE));
1637	/* wait for it to finish */
1638	do {
1639		udelay(1);
1640	} while (SMC_GET_CTL(lp) & CTL_STORE);
1641	/* clean up */
1642	SMC_SET_CTL(lp, ctl);
1643	SMC_SELECT_BANK(lp, 2);
1644	spin_unlock_irq(&lp->lock);
1645	return 0;
1646}
1647
1648static int smc_read_eeprom_word(struct net_device *dev, u16 addr, u16 *word)
1649{
1650	u16 ctl;
1651	struct smc_local *lp = netdev_priv(dev);
1652	void __iomem *ioaddr = lp->base;
1653
1654	spin_lock_irq(&lp->lock);
1655	/* set the EEPROM address to get the data from */
1656	SMC_SELECT_BANK(lp, 2);
1657	SMC_SET_PTR(lp, addr | PTR_READ);
1658	/* tell it to load */
1659	SMC_SELECT_BANK(lp, 1);
1660	SMC_SET_GP(lp, 0xffff);	/* init to known */
1661	ctl = SMC_GET_CTL(lp);
1662	SMC_SET_CTL(lp, ctl | (CTL_EEPROM_SELECT | CTL_RELOAD));
1663	/* wait for it to finish */
1664	do {
1665		udelay(1);
1666	} while (SMC_GET_CTL(lp) & CTL_RELOAD);
1667	/* read word from GP register */
1668	*word = SMC_GET_GP(lp);
1669	/* clean up */
1670	SMC_SET_CTL(lp, ctl);
1671	SMC_SELECT_BANK(lp, 2);
1672	spin_unlock_irq(&lp->lock);
1673	return 0;
1674}
1675
1676static int smc_ethtool_geteeprom_len(struct net_device *dev)
1677{
1678	return 0x23 * 2;
1679}
1680
1681static int smc_ethtool_geteeprom(struct net_device *dev,
1682		struct ethtool_eeprom *eeprom, u8 *data)
1683{
1684	int i;
1685	int imax;
1686
1687	DBG(1, dev, "Reading %d bytes at %d(0x%x)\n",
1688		eeprom->len, eeprom->offset, eeprom->offset);
1689	imax = smc_ethtool_geteeprom_len(dev);
1690	for (i = 0; i < eeprom->len; i += 2) {
1691		int ret;
1692		u16 wbuf;
1693		int offset = i + eeprom->offset;
1694		if (offset > imax)
1695			break;
1696		ret = smc_read_eeprom_word(dev, offset >> 1, &wbuf);
1697		if (ret != 0)
1698			return ret;
1699		DBG(2, dev, "Read 0x%x from 0x%x\n", wbuf, offset >> 1);
1700		data[i] = (wbuf >> 8) & 0xff;
1701		data[i+1] = wbuf & 0xff;
1702	}
1703	return 0;
1704}
1705
1706static int smc_ethtool_seteeprom(struct net_device *dev,
1707		struct ethtool_eeprom *eeprom, u8 *data)
1708{
1709	int i;
1710	int imax;
1711
1712	DBG(1, dev, "Writing %d bytes to %d(0x%x)\n",
1713	    eeprom->len, eeprom->offset, eeprom->offset);
1714	imax = smc_ethtool_geteeprom_len(dev);
1715	for (i = 0; i < eeprom->len; i += 2) {
1716		int ret;
1717		u16 wbuf;
1718		int offset = i + eeprom->offset;
1719		if (offset > imax)
1720			break;
1721		wbuf = (data[i] << 8) | data[i + 1];
1722		DBG(2, dev, "Writing 0x%x to 0x%x\n", wbuf, offset >> 1);
1723		ret = smc_write_eeprom_word(dev, offset >> 1, wbuf);
1724		if (ret != 0)
1725			return ret;
1726	}
1727	return 0;
1728}
1729
1730
1731static const struct ethtool_ops smc_ethtool_ops = {
1732	.get_drvinfo	= smc_ethtool_getdrvinfo,
1733
1734	.get_msglevel	= smc_ethtool_getmsglevel,
1735	.set_msglevel	= smc_ethtool_setmsglevel,
1736	.nway_reset	= smc_ethtool_nwayreset,
1737	.get_link	= ethtool_op_get_link,
1738	.get_eeprom_len = smc_ethtool_geteeprom_len,
1739	.get_eeprom	= smc_ethtool_geteeprom,
1740	.set_eeprom	= smc_ethtool_seteeprom,
1741	.get_link_ksettings	= smc_ethtool_get_link_ksettings,
1742	.set_link_ksettings	= smc_ethtool_set_link_ksettings,
1743};
1744
1745static const struct net_device_ops smc_netdev_ops = {
1746	.ndo_open		= smc_open,
1747	.ndo_stop		= smc_close,
1748	.ndo_start_xmit		= smc_hard_start_xmit,
1749	.ndo_tx_timeout		= smc_timeout,
1750	.ndo_set_rx_mode	= smc_set_multicast_list,
1751	.ndo_validate_addr	= eth_validate_addr,
1752	.ndo_set_mac_address 	= eth_mac_addr,
1753#ifdef CONFIG_NET_POLL_CONTROLLER
1754	.ndo_poll_controller	= smc_poll_controller,
1755#endif
1756};
1757
1758/*
1759 * smc_findirq
1760 *
1761 * This routine has a simple purpose -- make the SMC chip generate an
1762 * interrupt, so an auto-detect routine can detect it, and find the IRQ,
1763 */
1764/*
1765 * does this still work?
1766 *
1767 * I just deleted auto_irq.c, since it was never built...
1768 *   --jgarzik
1769 */
1770static int smc_findirq(struct smc_local *lp)
1771{
1772	void __iomem *ioaddr = lp->base;
1773	int timeout = 20;
1774	unsigned long cookie;
1775
1776	DBG(2, lp->dev, "%s: %s\n", CARDNAME, __func__);
1777
1778	cookie = probe_irq_on();
1779
1780	/*
1781	 * What I try to do here is trigger an ALLOC_INT. This is done
1782	 * by allocating a small chunk of memory, which will give an interrupt
1783	 * when done.
1784	 */
1785	/* enable ALLOCation interrupts ONLY */
1786	SMC_SELECT_BANK(lp, 2);
1787	SMC_SET_INT_MASK(lp, IM_ALLOC_INT);
1788
1789	/*
1790	 * Allocate 512 bytes of memory.  Note that the chip was just
1791	 * reset so all the memory is available
1792	 */
1793	SMC_SET_MMU_CMD(lp, MC_ALLOC | 1);
1794
1795	/*
1796	 * Wait until positive that the interrupt has been generated
1797	 */
1798	do {
1799		int int_status;
1800		udelay(10);
1801		int_status = SMC_GET_INT(lp);
1802		if (int_status & IM_ALLOC_INT)
1803			break;		/* got the interrupt */
1804	} while (--timeout);
1805
1806	/*
1807	 * there is really nothing that I can do here if timeout fails,
1808	 * as autoirq_report will return a 0 anyway, which is what I
1809	 * want in this case.   Plus, the clean up is needed in both
1810	 * cases.
1811	 */
1812
1813	/* and disable all interrupts again */
1814	SMC_SET_INT_MASK(lp, 0);
1815
1816	/* and return what I found */
1817	return probe_irq_off(cookie);
1818}
1819
1820/*
1821 * Function: smc_probe(unsigned long ioaddr)
1822 *
1823 * Purpose:
1824 *	Tests to see if a given ioaddr points to an SMC91x chip.
1825 *	Returns a 0 on success
1826 *
1827 * Algorithm:
1828 *	(1) see if the high byte of BANK_SELECT is 0x33
1829 * 	(2) compare the ioaddr with the base register's address
1830 *	(3) see if I recognize the chip ID in the appropriate register
1831 *
1832 * Here I do typical initialization tasks.
1833 *
1834 * o  Initialize the structure if needed
1835 * o  print out my vanity message if not done so already
1836 * o  print out what type of hardware is detected
1837 * o  print out the ethernet address
1838 * o  find the IRQ
1839 * o  set up my private data
1840 * o  configure the dev structure with my subroutines
1841 * o  actually GRAB the irq.
1842 * o  GRAB the region
1843 */
1844static int smc_probe(struct net_device *dev, void __iomem *ioaddr,
1845		     unsigned long irq_flags)
1846{
1847	struct smc_local *lp = netdev_priv(dev);
1848	int retval;
1849	unsigned int val, revision_register;
1850	const char *version_string;
1851	u8 addr[ETH_ALEN];
1852
1853	DBG(2, dev, "%s: %s\n", CARDNAME, __func__);
1854
1855	/* First, see if the high byte is 0x33 */
1856	val = SMC_CURRENT_BANK(lp);
1857	DBG(2, dev, "%s: bank signature probe returned 0x%04x\n",
1858	    CARDNAME, val);
1859	if ((val & 0xFF00) != 0x3300) {
1860		if ((val & 0xFF) == 0x33) {
1861			netdev_warn(dev,
1862				    "%s: Detected possible byte-swapped interface at IOADDR %p\n",
1863				    CARDNAME, ioaddr);
1864		}
1865		retval = -ENODEV;
1866		goto err_out;
1867	}
1868
1869	/*
1870	 * The above MIGHT indicate a device, but I need to write to
1871	 * further test this.
1872	 */
1873	SMC_SELECT_BANK(lp, 0);
1874	val = SMC_CURRENT_BANK(lp);
1875	if ((val & 0xFF00) != 0x3300) {
1876		retval = -ENODEV;
1877		goto err_out;
1878	}
1879
1880	/*
1881	 * well, we've already written once, so hopefully another
1882	 * time won't hurt.  This time, I need to switch the bank
1883	 * register to bank 1, so I can access the base address
1884	 * register
1885	 */
1886	SMC_SELECT_BANK(lp, 1);
1887	val = SMC_GET_BASE(lp);
1888	val = ((val & 0x1F00) >> 3) << SMC_IO_SHIFT;
1889	if (((unsigned long)ioaddr & (0x3e0 << SMC_IO_SHIFT)) != val) {
1890		netdev_warn(dev, "%s: IOADDR %p doesn't match configuration (%x).\n",
1891			    CARDNAME, ioaddr, val);
1892	}
1893
1894	/*
1895	 * check if the revision register is something that I
1896	 * recognize.  These might need to be added to later,
1897	 * as future revisions could be added.
1898	 */
1899	SMC_SELECT_BANK(lp, 3);
1900	revision_register = SMC_GET_REV(lp);
1901	DBG(2, dev, "%s: revision = 0x%04x\n", CARDNAME, revision_register);
1902	version_string = chip_ids[ (revision_register >> 4) & 0xF];
1903	if (!version_string || (revision_register & 0xff00) != 0x3300) {
1904		/* I don't recognize this chip, so... */
1905		netdev_warn(dev, "%s: IO %p: Unrecognized revision register 0x%04x, Contact author.\n",
1906			    CARDNAME, ioaddr, revision_register);
1907
1908		retval = -ENODEV;
1909		goto err_out;
1910	}
1911
1912	/* At this point I'll assume that the chip is an SMC91x. */
1913	pr_info_once("%s\n", version);
1914
1915	/* fill in some of the fields */
1916	dev->base_addr = (unsigned long)ioaddr;
1917	lp->base = ioaddr;
1918	lp->version = revision_register & 0xff;
1919	spin_lock_init(&lp->lock);
1920
1921	/* Get the MAC address */
1922	SMC_SELECT_BANK(lp, 1);
1923	SMC_GET_MAC_ADDR(lp, addr);
1924	eth_hw_addr_set(dev, addr);
1925
1926	/* now, reset the chip, and put it into a known state */
1927	smc_reset(dev);
1928
1929	/*
1930	 * If dev->irq is 0, then the device has to be banged on to see
1931	 * what the IRQ is.
1932	 *
1933	 * This banging doesn't always detect the IRQ, for unknown reasons.
1934	 * a workaround is to reset the chip and try again.
1935	 *
1936	 * Interestingly, the DOS packet driver *SETS* the IRQ on the card to
1937	 * be what is requested on the command line.   I don't do that, mostly
1938	 * because the card that I have uses a non-standard method of accessing
1939	 * the IRQs, and because this _should_ work in most configurations.
1940	 *
1941	 * Specifying an IRQ is done with the assumption that the user knows
1942	 * what (s)he is doing.  No checking is done!!!!
1943	 */
1944	if (dev->irq < 1) {
1945		int trials;
1946
1947		trials = 3;
1948		while (trials--) {
1949			dev->irq = smc_findirq(lp);
1950			if (dev->irq)
1951				break;
1952			/* kick the card and try again */
1953			smc_reset(dev);
1954		}
1955	}
1956	if (dev->irq == 0) {
1957		netdev_warn(dev, "Couldn't autodetect your IRQ. Use irq=xx.\n");
1958		retval = -ENODEV;
1959		goto err_out;
1960	}
1961	dev->irq = irq_canonicalize(dev->irq);
1962
1963	dev->watchdog_timeo = msecs_to_jiffies(watchdog);
1964	dev->netdev_ops = &smc_netdev_ops;
1965	dev->ethtool_ops = &smc_ethtool_ops;
1966
1967	tasklet_setup(&lp->tx_task, smc_hardware_send_pkt);
1968	INIT_WORK(&lp->phy_configure, smc_phy_configure);
1969	lp->dev = dev;
1970	lp->mii.phy_id_mask = 0x1f;
1971	lp->mii.reg_num_mask = 0x1f;
1972	lp->mii.force_media = 0;
1973	lp->mii.full_duplex = 0;
1974	lp->mii.dev = dev;
1975	lp->mii.mdio_read = smc_phy_read;
1976	lp->mii.mdio_write = smc_phy_write;
1977
1978	/*
1979	 * Locate the phy, if any.
1980	 */
1981	if (lp->version >= (CHIP_91100 << 4))
1982		smc_phy_detect(dev);
1983
1984	/* then shut everything down to save power */
1985	smc_shutdown(dev);
1986	smc_phy_powerdown(dev);
1987
1988	/* Set default parameters */
1989	lp->msg_enable = NETIF_MSG_LINK;
1990	lp->ctl_rfduplx = 0;
1991	lp->ctl_rspeed = 10;
1992
1993	if (lp->version >= (CHIP_91100 << 4)) {
1994		lp->ctl_rfduplx = 1;
1995		lp->ctl_rspeed = 100;
1996	}
1997
1998	/* Grab the IRQ */
1999	retval = request_irq(dev->irq, smc_interrupt, irq_flags, dev->name, dev);
2000	if (retval)
2001		goto err_out;
2002
2003#ifdef CONFIG_ARCH_PXA
2004#  ifdef SMC_USE_PXA_DMA
2005	lp->cfg.flags |= SMC91X_USE_DMA;
2006#  endif
2007	if (lp->cfg.flags & SMC91X_USE_DMA) {
2008		dma_cap_mask_t mask;
2009
2010		dma_cap_zero(mask);
2011		dma_cap_set(DMA_SLAVE, mask);
2012		lp->dma_chan = dma_request_channel(mask, NULL, NULL);
2013	}
2014#endif
2015
2016	retval = register_netdev(dev);
2017	if (retval == 0) {
2018		/* now, print out the card info, in a short format.. */
2019		netdev_info(dev, "%s (rev %d) at %p IRQ %d",
2020			    version_string, revision_register & 0x0f,
2021			    lp->base, dev->irq);
2022
2023		if (lp->dma_chan)
2024			pr_cont(" DMA %p", lp->dma_chan);
2025
2026		pr_cont("%s%s\n",
2027			lp->cfg.flags & SMC91X_NOWAIT ? " [nowait]" : "",
2028			THROTTLE_TX_PKTS ? " [throttle_tx]" : "");
2029
2030		if (!is_valid_ether_addr(dev->dev_addr)) {
2031			netdev_warn(dev, "Invalid ethernet MAC address. Please set using ifconfig\n");
2032		} else {
2033			/* Print the Ethernet address */
2034			netdev_info(dev, "Ethernet addr: %pM\n",
2035				    dev->dev_addr);
2036		}
2037
2038		if (lp->phy_type == 0) {
2039			PRINTK(dev, "No PHY found\n");
2040		} else if ((lp->phy_type & 0xfffffff0) == 0x0016f840) {
2041			PRINTK(dev, "PHY LAN83C183 (LAN91C111 Internal)\n");
2042		} else if ((lp->phy_type & 0xfffffff0) == 0x02821c50) {
2043			PRINTK(dev, "PHY LAN83C180\n");
2044		}
2045	}
2046
2047err_out:
2048#ifdef CONFIG_ARCH_PXA
2049	if (retval && lp->dma_chan)
2050		dma_release_channel(lp->dma_chan);
2051#endif
2052	return retval;
2053}
2054
2055static int smc_enable_device(struct platform_device *pdev)
2056{
2057	struct net_device *ndev = platform_get_drvdata(pdev);
2058	struct smc_local *lp = netdev_priv(ndev);
2059	unsigned long flags;
2060	unsigned char ecor, ecsr;
2061	void __iomem *addr;
2062	struct resource * res;
2063
2064	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "smc91x-attrib");
2065	if (!res)
2066		return 0;
2067
2068	/*
2069	 * Map the attribute space.  This is overkill, but clean.
2070	 */
2071	addr = ioremap(res->start, ATTRIB_SIZE);
2072	if (!addr)
2073		return -ENOMEM;
2074
2075	/*
2076	 * Reset the device.  We must disable IRQs around this
2077	 * since a reset causes the IRQ line become active.
2078	 */
2079	local_irq_save(flags);
2080	ecor = readb(addr + (ECOR << SMC_IO_SHIFT)) & ~ECOR_RESET;
2081	writeb(ecor | ECOR_RESET, addr + (ECOR << SMC_IO_SHIFT));
2082	readb(addr + (ECOR << SMC_IO_SHIFT));
2083
2084	/*
2085	 * Wait 100us for the chip to reset.
2086	 */
2087	udelay(100);
2088
2089	/*
2090	 * The device will ignore all writes to the enable bit while
2091	 * reset is asserted, even if the reset bit is cleared in the
2092	 * same write.  Must clear reset first, then enable the device.
2093	 */
2094	writeb(ecor, addr + (ECOR << SMC_IO_SHIFT));
2095	writeb(ecor | ECOR_ENABLE, addr + (ECOR << SMC_IO_SHIFT));
2096
2097	/*
2098	 * Set the appropriate byte/word mode.
2099	 */
2100	ecsr = readb(addr + (ECSR << SMC_IO_SHIFT)) & ~ECSR_IOIS8;
2101	if (!SMC_16BIT(lp))
2102		ecsr |= ECSR_IOIS8;
2103	writeb(ecsr, addr + (ECSR << SMC_IO_SHIFT));
2104	local_irq_restore(flags);
2105
2106	iounmap(addr);
2107
2108	/*
2109	 * Wait for the chip to wake up.  We could poll the control
2110	 * register in the main register space, but that isn't mapped
2111	 * yet.  We know this is going to take 750us.
2112	 */
2113	msleep(1);
2114
2115	return 0;
2116}
2117
2118static int smc_request_attrib(struct platform_device *pdev,
2119			      struct net_device *ndev)
2120{
2121	struct resource * res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "smc91x-attrib");
2122	struct smc_local *lp __maybe_unused = netdev_priv(ndev);
2123
2124	if (!res)
2125		return 0;
2126
2127	if (!request_mem_region(res->start, ATTRIB_SIZE, CARDNAME))
2128		return -EBUSY;
2129
2130	return 0;
2131}
2132
2133static void smc_release_attrib(struct platform_device *pdev,
2134			       struct net_device *ndev)
2135{
2136	struct resource * res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "smc91x-attrib");
2137	struct smc_local *lp __maybe_unused = netdev_priv(ndev);
2138
2139	if (res)
2140		release_mem_region(res->start, ATTRIB_SIZE);
2141}
2142
2143static inline void smc_request_datacs(struct platform_device *pdev, struct net_device *ndev)
2144{
2145	if (SMC_CAN_USE_DATACS) {
2146		struct resource * res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "smc91x-data32");
2147		struct smc_local *lp = netdev_priv(ndev);
2148
2149		if (!res)
2150			return;
2151
2152		if(!request_mem_region(res->start, SMC_DATA_EXTENT, CARDNAME)) {
2153			netdev_info(ndev, "%s: failed to request datacs memory region.\n",
2154				    CARDNAME);
2155			return;
2156		}
2157
2158		lp->datacs = ioremap(res->start, SMC_DATA_EXTENT);
2159	}
2160}
2161
2162static void smc_release_datacs(struct platform_device *pdev, struct net_device *ndev)
2163{
2164	if (SMC_CAN_USE_DATACS) {
2165		struct smc_local *lp = netdev_priv(ndev);
2166		struct resource * res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "smc91x-data32");
2167
2168		if (lp->datacs)
2169			iounmap(lp->datacs);
2170
2171		lp->datacs = NULL;
2172
2173		if (res)
2174			release_mem_region(res->start, SMC_DATA_EXTENT);
2175	}
2176}
2177
2178static const struct acpi_device_id smc91x_acpi_match[] = {
2179	{ "LNRO0003", 0 },
2180	{ }
2181};
2182MODULE_DEVICE_TABLE(acpi, smc91x_acpi_match);
2183
2184#if IS_BUILTIN(CONFIG_OF)
2185static const struct of_device_id smc91x_match[] = {
2186	{ .compatible = "smsc,lan91c94", },
2187	{ .compatible = "smsc,lan91c111", },
2188	{},
2189};
2190MODULE_DEVICE_TABLE(of, smc91x_match);
2191
2192/**
2193 * try_toggle_control_gpio - configure a gpio if it exists
2194 * @dev: net device
2195 * @desc: where to store the GPIO descriptor, if it exists
2196 * @name: name of the GPIO in DT
2197 * @index: index of the GPIO in DT
2198 * @value: set the GPIO to this value
2199 * @nsdelay: delay before setting the GPIO
2200 */
2201static int try_toggle_control_gpio(struct device *dev,
2202				   struct gpio_desc **desc,
2203				   const char *name, int index,
2204				   int value, unsigned int nsdelay)
2205{
2206	struct gpio_desc *gpio;
2207	enum gpiod_flags flags = value ? GPIOD_OUT_LOW : GPIOD_OUT_HIGH;
2208
2209	gpio = devm_gpiod_get_index_optional(dev, name, index, flags);
2210	if (IS_ERR(gpio))
2211		return PTR_ERR(gpio);
2212
2213	if (gpio) {
2214		if (nsdelay)
2215			usleep_range(nsdelay, 2 * nsdelay);
2216		gpiod_set_value_cansleep(gpio, value);
2217	}
2218	*desc = gpio;
2219
2220	return 0;
2221}
2222#endif
2223
2224/*
2225 * smc_init(void)
2226 *   Input parameters:
2227 *	dev->base_addr == 0, try to find all possible locations
2228 *	dev->base_addr > 0x1ff, this is the address to check
2229 *	dev->base_addr == <anything else>, return failure code
2230 *
2231 *   Output:
2232 *	0 --> there is a device
2233 *	anything else, error
2234 */
2235static int smc_drv_probe(struct platform_device *pdev)
2236{
2237	struct smc91x_platdata *pd = dev_get_platdata(&pdev->dev);
2238	const struct of_device_id *match = NULL;
2239	struct smc_local *lp;
2240	struct net_device *ndev;
2241	struct resource *res;
2242	unsigned int __iomem *addr;
2243	unsigned long irq_flags = SMC_IRQ_FLAGS;
2244	unsigned long irq_resflags;
2245	int ret;
2246
2247	ndev = alloc_etherdev(sizeof(struct smc_local));
2248	if (!ndev) {
2249		ret = -ENOMEM;
2250		goto out;
2251	}
2252	SET_NETDEV_DEV(ndev, &pdev->dev);
2253
2254	/* get configuration from platform data, only allow use of
2255	 * bus width if both SMC_CAN_USE_xxx and SMC91X_USE_xxx are set.
2256	 */
2257
2258	lp = netdev_priv(ndev);
2259	lp->cfg.flags = 0;
2260
2261	if (pd) {
2262		memcpy(&lp->cfg, pd, sizeof(lp->cfg));
2263		lp->io_shift = SMC91X_IO_SHIFT(lp->cfg.flags);
2264
2265		if (!SMC_8BIT(lp) && !SMC_16BIT(lp)) {
2266			dev_err(&pdev->dev,
2267				"at least one of 8-bit or 16-bit access support is required.\n");
2268			ret = -ENXIO;
2269			goto out_free_netdev;
2270		}
2271	}
2272
2273#if IS_BUILTIN(CONFIG_OF)
2274	match = of_match_device(of_match_ptr(smc91x_match), &pdev->dev);
2275	if (match) {
2276		u32 val;
2277
2278		/* Optional pwrdwn GPIO configured? */
2279		ret = try_toggle_control_gpio(&pdev->dev, &lp->power_gpio,
2280					      "power", 0, 0, 100);
2281		if (ret)
2282			goto out_free_netdev;
2283
2284		/*
2285		 * Optional reset GPIO configured? Minimum 100 ns reset needed
2286		 * according to LAN91C96 datasheet page 14.
2287		 */
2288		ret = try_toggle_control_gpio(&pdev->dev, &lp->reset_gpio,
2289					      "reset", 0, 0, 100);
2290		if (ret)
2291			goto out_free_netdev;
2292
2293		/*
2294		 * Need to wait for optional EEPROM to load, max 750 us according
2295		 * to LAN91C96 datasheet page 55.
2296		 */
2297		if (lp->reset_gpio)
2298			usleep_range(750, 1000);
2299
2300		/* Combination of IO widths supported, default to 16-bit */
2301		if (!device_property_read_u32(&pdev->dev, "reg-io-width",
2302					      &val)) {
2303			if (val & 1)
2304				lp->cfg.flags |= SMC91X_USE_8BIT;
2305			if ((val == 0) || (val & 2))
2306				lp->cfg.flags |= SMC91X_USE_16BIT;
2307			if (val & 4)
2308				lp->cfg.flags |= SMC91X_USE_32BIT;
2309		} else {
2310			lp->cfg.flags |= SMC91X_USE_16BIT;
2311		}
2312		if (!device_property_read_u32(&pdev->dev, "reg-shift",
2313					      &val))
2314			lp->io_shift = val;
2315		lp->cfg.pxa_u16_align4 =
2316			device_property_read_bool(&pdev->dev, "pxa-u16-align4");
2317	}
2318#endif
2319
2320	if (!pd && !match) {
2321		lp->cfg.flags |= (SMC_CAN_USE_8BIT)  ? SMC91X_USE_8BIT  : 0;
2322		lp->cfg.flags |= (SMC_CAN_USE_16BIT) ? SMC91X_USE_16BIT : 0;
2323		lp->cfg.flags |= (SMC_CAN_USE_32BIT) ? SMC91X_USE_32BIT : 0;
2324		lp->cfg.flags |= (nowait) ? SMC91X_NOWAIT : 0;
2325	}
2326
2327	if (!lp->cfg.leda && !lp->cfg.ledb) {
2328		lp->cfg.leda = RPC_LSA_DEFAULT;
2329		lp->cfg.ledb = RPC_LSB_DEFAULT;
2330	}
2331
2332	ndev->dma = (unsigned char)-1;
2333
2334	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "smc91x-regs");
2335	if (!res)
2336		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2337	if (!res) {
2338		ret = -ENODEV;
2339		goto out_free_netdev;
2340	}
2341
2342
2343	if (!request_mem_region(res->start, SMC_IO_EXTENT, CARDNAME)) {
2344		ret = -EBUSY;
2345		goto out_free_netdev;
2346	}
2347
2348	ndev->irq = platform_get_irq(pdev, 0);
2349	if (ndev->irq < 0) {
2350		ret = ndev->irq;
2351		goto out_release_io;
2352	}
2353	/*
2354	 * If this platform does not specify any special irqflags, or if
2355	 * the resource supplies a trigger, override the irqflags with
2356	 * the trigger flags from the resource.
2357	 */
2358	irq_resflags = irq_get_trigger_type(ndev->irq);
2359	if (irq_flags == -1 || irq_resflags & IRQF_TRIGGER_MASK)
2360		irq_flags = irq_resflags & IRQF_TRIGGER_MASK;
2361
2362	ret = smc_request_attrib(pdev, ndev);
2363	if (ret)
2364		goto out_release_io;
2365#if defined(CONFIG_ASSABET_NEPONSET)
2366	if (machine_is_assabet() && machine_has_neponset())
2367		neponset_ncr_set(NCR_ENET_OSC_EN);
2368#endif
2369	platform_set_drvdata(pdev, ndev);
2370	ret = smc_enable_device(pdev);
2371	if (ret)
2372		goto out_release_attrib;
2373
2374	addr = ioremap(res->start, SMC_IO_EXTENT);
2375	if (!addr) {
2376		ret = -ENOMEM;
2377		goto out_release_attrib;
2378	}
2379
2380#ifdef CONFIG_ARCH_PXA
2381	{
2382		struct smc_local *lp = netdev_priv(ndev);
2383		lp->device = &pdev->dev;
2384		lp->physaddr = res->start;
2385
2386	}
2387#endif
2388
2389	ret = smc_probe(ndev, addr, irq_flags);
2390	if (ret != 0)
2391		goto out_iounmap;
2392
2393	smc_request_datacs(pdev, ndev);
2394
2395	return 0;
2396
2397 out_iounmap:
2398	iounmap(addr);
2399 out_release_attrib:
2400	smc_release_attrib(pdev, ndev);
2401 out_release_io:
2402	release_mem_region(res->start, SMC_IO_EXTENT);
2403 out_free_netdev:
2404	free_netdev(ndev);
2405 out:
2406	pr_info("%s: not found (%d).\n", CARDNAME, ret);
2407
2408	return ret;
2409}
2410
2411static void smc_drv_remove(struct platform_device *pdev)
2412{
2413	struct net_device *ndev = platform_get_drvdata(pdev);
2414	struct smc_local *lp = netdev_priv(ndev);
2415	struct resource *res;
2416
2417	unregister_netdev(ndev);
2418
2419	free_irq(ndev->irq, ndev);
2420
2421#ifdef CONFIG_ARCH_PXA
2422	if (lp->dma_chan)
2423		dma_release_channel(lp->dma_chan);
2424#endif
2425	iounmap(lp->base);
2426
2427	smc_release_datacs(pdev,ndev);
2428	smc_release_attrib(pdev,ndev);
2429
2430	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "smc91x-regs");
2431	if (!res)
2432		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2433	release_mem_region(res->start, SMC_IO_EXTENT);
2434
2435	free_netdev(ndev);
 
 
2436}
2437
2438static int smc_drv_suspend(struct device *dev)
2439{
2440	struct net_device *ndev = dev_get_drvdata(dev);
2441
2442	if (ndev) {
2443		if (netif_running(ndev)) {
2444			netif_device_detach(ndev);
2445			smc_shutdown(ndev);
2446			smc_phy_powerdown(ndev);
2447		}
2448	}
2449	return 0;
2450}
2451
2452static int smc_drv_resume(struct device *dev)
2453{
2454	struct platform_device *pdev = to_platform_device(dev);
2455	struct net_device *ndev = platform_get_drvdata(pdev);
2456
2457	if (ndev) {
2458		struct smc_local *lp = netdev_priv(ndev);
2459		smc_enable_device(pdev);
2460		if (netif_running(ndev)) {
2461			smc_reset(ndev);
2462			smc_enable(ndev);
2463			if (lp->phy_type != 0)
2464				smc_phy_configure(&lp->phy_configure);
2465			netif_device_attach(ndev);
2466		}
2467	}
2468	return 0;
2469}
2470
2471static const struct dev_pm_ops smc_drv_pm_ops = {
2472	.suspend	= smc_drv_suspend,
2473	.resume		= smc_drv_resume,
2474};
2475
2476static struct platform_driver smc_driver = {
2477	.probe		= smc_drv_probe,
2478	.remove		= smc_drv_remove,
2479	.driver		= {
2480		.name	= CARDNAME,
2481		.pm	= &smc_drv_pm_ops,
2482		.of_match_table   = of_match_ptr(smc91x_match),
2483		.acpi_match_table = smc91x_acpi_match,
2484	},
2485};
2486
2487module_platform_driver(smc_driver);