1/*
   2 *  linux/drivers/acorn/net/ether1.c
   3 *
   4 *  Copyright (C) 1996-2000 Russell King
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 *  Acorn ether1 driver (82586 chip) for Acorn machines
  11 *
  12 * We basically keep two queues in the cards memory - one for transmit
  13 * and one for receive.  Each has a head and a tail.  The head is where
  14 * we/the chip adds packets to be transmitted/received, and the tail
  15 * is where the transmitter has got to/where the receiver will stop.
  16 * Both of these queues are circular, and since the chip is running
  17 * all the time, we have to be careful when we modify the pointers etc
  18 * so that the buffer memory contents is valid all the time.
  19 *
  20 * Change log:
  21 * 1.00	RMK			Released
  22 * 1.01	RMK	19/03/1996	Transfers the last odd byte onto/off of the card now.
  23 * 1.02	RMK	25/05/1997	Added code to restart RU if it goes not ready
  24 * 1.03	RMK	14/09/1997	Cleaned up the handling of a reset during the TX interrupt.
  25 *				Should prevent lockup.
  26 * 1.04 RMK	17/09/1997	Added more info when initialsation of chip goes wrong.
  27 *				TDR now only reports failure when chip reports non-zero
  28 *				TDR time-distance.
  29 * 1.05	RMK	31/12/1997	Removed calls to dev_tint for 2.1
  30 * 1.06	RMK	10/02/2000	Updated for 2.3.43
  31 * 1.07	RMK	13/05/2000	Updated for 2.3.99-pre8
  32 */
  33
  34#include <linux/module.h>
  35#include <linux/kernel.h>
  36#include <linux/types.h>
  37#include <linux/fcntl.h>
  38#include <linux/interrupt.h>
  39#include <linux/ioport.h>
  40#include <linux/in.h>
  41#include <linux/slab.h>
  42#include <linux/string.h>
  43#include <linux/errno.h>
  44#include <linux/device.h>
  45#include <linux/init.h>
  46#include <linux/netdevice.h>
  47#include <linux/etherdevice.h>
  48#include <linux/skbuff.h>
  49#include <linux/bitops.h>
  50
  51#include <asm/io.h>
  52#include <asm/dma.h>
  53#include <asm/ecard.h>
  54
  55#define __ETHER1_C
  56#include "ether1.h"
  57
  58static unsigned int net_debug = NET_DEBUG;
  59
  60#define BUFFER_SIZE	0x10000
  61#define TX_AREA_START	0x00100
  62#define TX_AREA_END	0x05000
  63#define RX_AREA_START	0x05000
  64#define RX_AREA_END	0x0fc00
  65
  66static int ether1_open(struct net_device *dev);
  67static int ether1_sendpacket(struct sk_buff *skb, struct net_device *dev);
  68static irqreturn_t ether1_interrupt(int irq, void *dev_id);
  69static int ether1_close(struct net_device *dev);
  70static void ether1_setmulticastlist(struct net_device *dev);
  71static void ether1_timeout(struct net_device *dev);
  72
  73/* ------------------------------------------------------------------------- */
  74
  75static char version[] = "ether1 ethernet driver (c) 2000 Russell King v1.07\n";
  76
  77#define BUS_16 16
  78#define BUS_8  8
  79
  80/* ------------------------------------------------------------------------- */
  81
  82#define DISABLEIRQS 1
  83#define NORMALIRQS  0
  84
  85#define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
  86#define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs)
  87
  88static inline unsigned short
  89ether1_inw_p (struct net_device *dev, int addr, int svflgs)
  90{
  91	unsigned long flags;
  92	unsigned short ret;
  93
  94	if (svflgs)
  95		local_irq_save (flags);
  96
  97	writeb(addr >> 12, REG_PAGE);
  98	ret = readw(ETHER1_RAM + ((addr & 4095) << 1));
  99	if (svflgs)
 100		local_irq_restore (flags);
 101	return ret;
 102}
 103
 104static inline void
 105ether1_outw_p (struct net_device *dev, unsigned short val, int addr, int svflgs)
 106{
 107	unsigned long flags;
 108
 109	if (svflgs)
 110		local_irq_save (flags);
 111
 112	writeb(addr >> 12, REG_PAGE);
 113	writew(val, ETHER1_RAM + ((addr & 4095) << 1));
 114	if (svflgs)
 115		local_irq_restore (flags);
 116}
 117
 118/*
 119 * Some inline assembler to allow fast transfers on to/off of the card.
 120 * Since this driver depends on some features presented by the ARM
 121 * specific architecture, and that you can't configure this driver
 122 * without specifiing ARM mode, this is not a problem.
 123 *
 124 * This routine is essentially an optimised memcpy from the card's
 125 * onboard RAM to kernel memory.
 126 */
 127static void
 128ether1_writebuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
 129{
 130	unsigned int page, thislen, offset;
 131	void __iomem *addr;
 132
 133	offset = start & 4095;
 134	page = start >> 12;
 135	addr = ETHER1_RAM + (offset << 1);
 136
 137	if (offset + length > 4096)
 138		thislen = 4096 - offset;
 139	else
 140		thislen = length;
 141
 142	do {
 143		int used;
 144
 145		writeb(page, REG_PAGE);
 146		length -= thislen;
 147
 148		__asm__ __volatile__(
 149	"subs	%3, %3, #2\n\
 150	bmi	2f\n\
 1511:	ldr	%0, [%1], #2\n\
 152	mov	%0, %0, lsl #16\n\
 153	orr	%0, %0, %0, lsr #16\n\
 154	str	%0, [%2], #4\n\
 155	subs	%3, %3, #2\n\
 156	bmi	2f\n\
 157	ldr	%0, [%1], #2\n\
 158	mov	%0, %0, lsl #16\n\
 159	orr	%0, %0, %0, lsr #16\n\
 160	str	%0, [%2], #4\n\
 161	subs	%3, %3, #2\n\
 162	bmi	2f\n\
 163	ldr	%0, [%1], #2\n\
 164	mov	%0, %0, lsl #16\n\
 165	orr	%0, %0, %0, lsr #16\n\
 166	str	%0, [%2], #4\n\
 167	subs	%3, %3, #2\n\
 168	bmi	2f\n\
 169	ldr	%0, [%1], #2\n\
 170	mov	%0, %0, lsl #16\n\
 171	orr	%0, %0, %0, lsr #16\n\
 172	str	%0, [%2], #4\n\
 173	subs	%3, %3, #2\n\
 174	bpl	1b\n\
 1752:	adds	%3, %3, #1\n\
 176	ldreqb	%0, [%1]\n\
 177	streqb	%0, [%2]"
 178		: "=&r" (used), "=&r" (data)
 179		: "r"  (addr), "r" (thislen), "1" (data));
 180
 181		addr = ETHER1_RAM;
 182
 183		thislen = length;
 184		if (thislen > 4096)
 185			thislen = 4096;
 186		page++;
 187	} while (thislen);
 188}
 189
 190static void
 191ether1_readbuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
 192{
 193	unsigned int page, thislen, offset;
 194	void __iomem *addr;
 195
 196	offset = start & 4095;
 197	page = start >> 12;
 198	addr = ETHER1_RAM + (offset << 1);
 199
 200	if (offset + length > 4096)
 201		thislen = 4096 - offset;
 202	else
 203		thislen = length;
 204
 205	do {
 206		int used;
 207
 208		writeb(page, REG_PAGE);
 209		length -= thislen;
 210
 211		__asm__ __volatile__(
 212	"subs	%3, %3, #2\n\
 213	bmi	2f\n\
 2141:	ldr	%0, [%2], #4\n\
 215	strb	%0, [%1], #1\n\
 216	mov	%0, %0, lsr #8\n\
 217	strb	%0, [%1], #1\n\
 218	subs	%3, %3, #2\n\
 219	bmi	2f\n\
 220	ldr	%0, [%2], #4\n\
 221	strb	%0, [%1], #1\n\
 222	mov	%0, %0, lsr #8\n\
 223	strb	%0, [%1], #1\n\
 224	subs	%3, %3, #2\n\
 225	bmi	2f\n\
 226	ldr	%0, [%2], #4\n\
 227	strb	%0, [%1], #1\n\
 228	mov	%0, %0, lsr #8\n\
 229	strb	%0, [%1], #1\n\
 230	subs	%3, %3, #2\n\
 231	bmi	2f\n\
 232	ldr	%0, [%2], #4\n\
 233	strb	%0, [%1], #1\n\
 234	mov	%0, %0, lsr #8\n\
 235	strb	%0, [%1], #1\n\
 236	subs	%3, %3, #2\n\
 237	bpl	1b\n\
 2382:	adds	%3, %3, #1\n\
 239	ldreqb	%0, [%2]\n\
 240	streqb	%0, [%1]"
 241		: "=&r" (used), "=&r" (data)
 242		: "r"  (addr), "r" (thislen), "1" (data));
 243
 244		addr = ETHER1_RAM;
 245
 246		thislen = length;
 247		if (thislen > 4096)
 248			thislen = 4096;
 249		page++;
 250	} while (thislen);
 251}
 252
 253static int
 254ether1_ramtest(struct net_device *dev, unsigned char byte)
 255{
 256	unsigned char *buffer = kmalloc (BUFFER_SIZE, GFP_KERNEL);
 257	int i, ret = BUFFER_SIZE;
 258	int max_errors = 15;
 259	int bad = -1;
 260	int bad_start = 0;
 261
 262	if (!buffer)
 263		return 1;
 264
 265	memset (buffer, byte, BUFFER_SIZE);
 266	ether1_writebuffer (dev, buffer, 0, BUFFER_SIZE);
 267	memset (buffer, byte ^ 0xff, BUFFER_SIZE);
 268	ether1_readbuffer (dev, buffer, 0, BUFFER_SIZE);
 269
 270	for (i = 0; i < BUFFER_SIZE; i++) {
 271		if (buffer[i] != byte) {
 272			if (max_errors >= 0 && bad != buffer[i]) {
 273				if (bad != -1)
 274					printk ("\n");
 275				printk (KERN_CRIT "%s: RAM failed with (%02X instead of %02X) at 0x%04X",
 276					dev->name, buffer[i], byte, i);
 277				ret = -ENODEV;
 278				max_errors --;
 279				bad = buffer[i];
 280				bad_start = i;
 281			}
 282		} else {
 283			if (bad != -1) {
 284			    	if (bad_start == i - 1)
 285					printk ("\n");
 286				else
 287					printk (" - 0x%04X\n", i - 1);
 288				bad = -1;
 289			}
 290		}
 291	}
 292
 293	if (bad != -1)
 294		printk (" - 0x%04X\n", BUFFER_SIZE);
 295	kfree (buffer);
 296
 297	return ret;
 298}
 299
 300static int
 301ether1_reset (struct net_device *dev)
 302{
 303	writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
 304	return BUS_16;
 305}
 306
 307static int
 308ether1_init_2(struct net_device *dev)
 309{
 310	int i;
 311	dev->mem_start = 0;
 312
 313	i = ether1_ramtest (dev, 0x5a);
 314
 315	if (i > 0)
 316		i = ether1_ramtest (dev, 0x1e);
 317
 318	if (i <= 0)
 319	    	return -ENODEV;
 320
 321	dev->mem_end = i;
 322	return 0;
 323}
 324
 325/*
 326 * These are the structures that are loaded into the ether RAM card to
 327 * initialise the 82586
 328 */
 329
 330/* at 0x0100 */
 331#define NOP_ADDR	(TX_AREA_START)
 332#define NOP_SIZE	(0x06)
 333static nop_t  init_nop  = {
 334	0,
 335	CMD_NOP,
 336	NOP_ADDR
 337};
 338
 339/* at 0x003a */
 340#define TDR_ADDR	(0x003a)
 341#define TDR_SIZE	(0x08)
 342static tdr_t  init_tdr	= {
 343	0,
 344	CMD_TDR | CMD_INTR,
 345	NOP_ADDR,
 346	0
 347};
 348
 349/* at 0x002e */
 350#define MC_ADDR		(0x002e)
 351#define MC_SIZE		(0x0c)
 352static mc_t   init_mc   = {
 353	0,
 354	CMD_SETMULTICAST,
 355	TDR_ADDR,
 356	0,
 357	{ { 0, } }
 358};
 359
 360/* at 0x0022 */
 361#define SA_ADDR		(0x0022)
 362#define SA_SIZE		(0x0c)
 363static sa_t   init_sa   = {
 364	0,
 365	CMD_SETADDRESS,
 366	MC_ADDR,
 367	{ 0, }
 368};
 369
 370/* at 0x0010 */
 371#define CFG_ADDR	(0x0010)
 372#define CFG_SIZE	(0x12)
 373static cfg_t  init_cfg  = {
 374	0,
 375	CMD_CONFIG,
 376	SA_ADDR,
 377	8,
 378	8,
 379	CFG8_SRDY,
 380	CFG9_PREAMB8 | CFG9_ADDRLENBUF | CFG9_ADDRLEN(6),
 381	0,
 382	0x60,
 383	0,
 384	CFG13_RETRY(15) | CFG13_SLOTH(2),
 385	0,
 386};
 387
 388/* at 0x0000 */
 389#define SCB_ADDR	(0x0000)
 390#define SCB_SIZE	(0x10)
 391static scb_t  init_scb  = {
 392	0,
 393	SCB_CMDACKRNR | SCB_CMDACKCNA | SCB_CMDACKFR | SCB_CMDACKCX,
 394	CFG_ADDR,
 395	RX_AREA_START,
 396	0,
 397	0,
 398	0,
 399	0
 400};
 401
 402/* at 0xffee */
 403#define ISCP_ADDR	(0xffee)
 404#define ISCP_SIZE	(0x08)
 405static iscp_t init_iscp = {
 406	1,
 407	SCB_ADDR,
 408	0x0000,
 409	0x0000
 410};
 411
 412/* at 0xfff6 */
 413#define SCP_ADDR	(0xfff6)
 414#define SCP_SIZE	(0x0a)
 415static scp_t  init_scp  = {
 416	SCP_SY_16BBUS,
 417	{ 0, 0 },
 418	ISCP_ADDR,
 419	0
 420};
 421
 422#define RFD_SIZE	(0x16)
 423static rfd_t  init_rfd	= {
 424	0,
 425	0,
 426	0,
 427	0,
 428	{ 0, },
 429	{ 0, },
 430	0
 431};
 432
 433#define RBD_SIZE	(0x0a)
 434static rbd_t  init_rbd	= {
 435	0,
 436	0,
 437	0,
 438	0,
 439	ETH_FRAME_LEN + 8
 440};
 441
 442#define TX_SIZE		(0x08)
 443#define TBD_SIZE	(0x08)
 444
 445static int
 446ether1_init_for_open (struct net_device *dev)
 447{
 448	int i, status, addr, next, next2;
 449	int failures = 0;
 450	unsigned long timeout;
 451
 452	writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
 453
 454	for (i = 0; i < 6; i++)
 455		init_sa.sa_addr[i] = dev->dev_addr[i];
 456
 457	/* load data structures into ether1 RAM */
 458	ether1_writebuffer (dev, &init_scp,  SCP_ADDR,  SCP_SIZE);
 459	ether1_writebuffer (dev, &init_iscp, ISCP_ADDR, ISCP_SIZE);
 460	ether1_writebuffer (dev, &init_scb,  SCB_ADDR,  SCB_SIZE);
 461	ether1_writebuffer (dev, &init_cfg,  CFG_ADDR,  CFG_SIZE);
 462	ether1_writebuffer (dev, &init_sa,   SA_ADDR,   SA_SIZE);
 463	ether1_writebuffer (dev, &init_mc,   MC_ADDR,   MC_SIZE);
 464	ether1_writebuffer (dev, &init_tdr,  TDR_ADDR,  TDR_SIZE);
 465	ether1_writebuffer (dev, &init_nop,  NOP_ADDR,  NOP_SIZE);
 466
 467	if (ether1_readw(dev, CFG_ADDR, cfg_t, cfg_command, NORMALIRQS) != CMD_CONFIG) {
 468		printk (KERN_ERR "%s: detected either RAM fault or compiler bug\n",
 469			dev->name);
 470		return 1;
 471	}
 472
 473	/*
 474	 * setup circularly linked list of { rfd, rbd, buffer }, with
 475	 * all rfds circularly linked, rbds circularly linked.
 476	 * First rfd is linked to scp, first rbd is linked to first
 477	 * rfd.  Last rbd has a suspend command.
 478	 */
 479	addr = RX_AREA_START;
 480	do {
 481		next = addr + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
 482		next2 = next + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
 483
 484		if (next2 >= RX_AREA_END) {
 485			next = RX_AREA_START;
 486			init_rfd.rfd_command = RFD_CMDEL | RFD_CMDSUSPEND;
 487			priv(dev)->rx_tail = addr;
 488		} else
 489			init_rfd.rfd_command = 0;
 490		if (addr == RX_AREA_START)
 491			init_rfd.rfd_rbdoffset = addr + RFD_SIZE;
 492		else
 493			init_rfd.rfd_rbdoffset = 0;
 494		init_rfd.rfd_link = next;
 495		init_rbd.rbd_link = next + RFD_SIZE;
 496		init_rbd.rbd_bufl = addr + RFD_SIZE + RBD_SIZE;
 497
 498		ether1_writebuffer (dev, &init_rfd, addr, RFD_SIZE);
 499		ether1_writebuffer (dev, &init_rbd, addr + RFD_SIZE, RBD_SIZE);
 500		addr = next;
 501	} while (next2 < RX_AREA_END);
 502
 503	priv(dev)->tx_link = NOP_ADDR;
 504	priv(dev)->tx_head = NOP_ADDR + NOP_SIZE;
 505	priv(dev)->tx_tail = TDR_ADDR;
 506	priv(dev)->rx_head = RX_AREA_START;
 507
 508	/* release reset & give 586 a prod */
 509	priv(dev)->resetting = 1;
 510	priv(dev)->initialising = 1;
 511	writeb(CTRL_RST, REG_CONTROL);
 512	writeb(0, REG_CONTROL);
 513	writeb(CTRL_CA, REG_CONTROL);
 514
 515	/* 586 should now unset iscp.busy */
 516	timeout = jiffies + HZ/2;
 517	while (ether1_readw(dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) {
 518		if (time_after(jiffies, timeout)) {
 519			printk (KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name);
 520			return 1;
 521		}
 522	}
 523
 524	/* check status of commands that we issued */
 525	timeout += HZ/10;
 526	while (((status = ether1_readw(dev, CFG_ADDR, cfg_t, cfg_status, DISABLEIRQS))
 527			& STAT_COMPLETE) == 0) {
 528		if (time_after(jiffies, timeout))
 529			break;
 530	}
 531
 532	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
 533		printk (KERN_WARNING "%s: can't initialise 82586: config status %04X\n", dev->name, status);
 534		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
 535			ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
 536			ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
 537			ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
 538			ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
 539		failures += 1;
 540	}
 541
 542	timeout += HZ/10;
 543	while (((status = ether1_readw(dev, SA_ADDR, sa_t, sa_status, DISABLEIRQS))
 544			& STAT_COMPLETE) == 0) {
 545		if (time_after(jiffies, timeout))
 546			break;
 547	}
 548
 549	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
 550		printk (KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status);
 551		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
 552			ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
 553			ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
 554			ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
 555			ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
 556		failures += 1;
 557	}
 558
 559	timeout += HZ/10;
 560	while (((status = ether1_readw(dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS))
 561			& STAT_COMPLETE) == 0) {
 562		if (time_after(jiffies, timeout))
 563			break;
 564	}
 565
 566	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
 567		printk (KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status);
 568		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
 569			ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
 570			ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
 571			ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
 572			ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
 573		failures += 1;
 574	}
 575
 576	timeout += HZ;
 577	while (((status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS))
 578			& STAT_COMPLETE) == 0) {
 579		if (time_after(jiffies, timeout))
 580			break;
 581	}
 582
 583	if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
 584		printk (KERN_WARNING "%s: can't tdr (ignored)\n", dev->name);
 585		printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
 586			ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
 587			ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
 588			ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
 589			ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
 590	} else {
 591		status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS);
 592		if (status & TDR_XCVRPROB)
 593			printk (KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name);
 594		else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) {
 595#ifdef FANCY
 596			printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name,
 597				status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10,
 598				(status & TDR_TIME) % 10);
 599#else
 600			printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d clks away\n", dev->name,
 601				status & TDR_SHORT ? "short" : "open", (status & TDR_TIME));
 602#endif
 603		}
 604	}
 605
 606	if (failures)
 607		ether1_reset (dev);
 608	return failures ? 1 : 0;
 609}
 610
 611/* ------------------------------------------------------------------------- */
 612
 613static int
 614ether1_txalloc (struct net_device *dev, int size)
 615{
 616	int start, tail;
 617
 618	size = (size + 1) & ~1;
 619	tail = priv(dev)->tx_tail;
 620
 621	if (priv(dev)->tx_head + size > TX_AREA_END) {
 622		if (tail > priv(dev)->tx_head)
 623			return -1;
 624		start = TX_AREA_START;
 625		if (start + size > tail)
 626			return -1;
 627		priv(dev)->tx_head = start + size;
 628	} else {
 629		if (priv(dev)->tx_head < tail && (priv(dev)->tx_head + size) > tail)
 630			return -1;
 631		start = priv(dev)->tx_head;
 632		priv(dev)->tx_head += size;
 633	}
 634
 635	return start;
 636}
 637
 638static int
 639ether1_open (struct net_device *dev)
 640{
 641	if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev))
 642		return -EAGAIN;
 643
 644	if (ether1_init_for_open (dev)) {
 645		free_irq (dev->irq, dev);
 646		return -EAGAIN;
 647	}
 648
 649	netif_start_queue(dev);
 650
 651	return 0;
 652}
 653
 654static void
 655ether1_timeout(struct net_device *dev)
 656{
 657	printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n",
 658		dev->name);
 659	printk(KERN_WARNING "%s: resetting device\n", dev->name);
 660
 661	ether1_reset (dev);
 662
 663	if (ether1_init_for_open (dev))
 664		printk (KERN_ERR "%s: unable to restart interface\n", dev->name);
 665
 666	dev->stats.tx_errors++;
 667	netif_wake_queue(dev);
 668}
 669
 670static int
 671ether1_sendpacket (struct sk_buff *skb, struct net_device *dev)
 672{
 673	int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
 674	unsigned long flags;
 675	tx_t tx;
 676	tbd_t tbd;
 677	nop_t nop;
 678
 679	if (priv(dev)->restart) {
 680		printk(KERN_WARNING "%s: resetting device\n", dev->name);
 681
 682		ether1_reset(dev);
 683
 684		if (ether1_init_for_open(dev))
 685			printk(KERN_ERR "%s: unable to restart interface\n", dev->name);
 686		else
 687			priv(dev)->restart = 0;
 688	}
 689
 690	if (skb->len < ETH_ZLEN) {
 691		if (skb_padto(skb, ETH_ZLEN))
 692			goto out;
 693	}
 694
 695	/*
 696	 * insert packet followed by a nop
 697	 */
 698	txaddr = ether1_txalloc (dev, TX_SIZE);
 699	tbdaddr = ether1_txalloc (dev, TBD_SIZE);
 700	dataddr = ether1_txalloc (dev, skb->len);
 701	nopaddr = ether1_txalloc (dev, NOP_SIZE);
 702
 703	tx.tx_status = 0;
 704	tx.tx_command = CMD_TX | CMD_INTR;
 705	tx.tx_link = nopaddr;
 706	tx.tx_tbdoffset = tbdaddr;
 707	tbd.tbd_opts = TBD_EOL | skb->len;
 708	tbd.tbd_link = I82586_NULL;
 709	tbd.tbd_bufl = dataddr;
 710	tbd.tbd_bufh = 0;
 711	nop.nop_status = 0;
 712	nop.nop_command = CMD_NOP;
 713	nop.nop_link = nopaddr;
 714
 715	local_irq_save(flags);
 716	ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
 717	ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
 718	ether1_writebuffer (dev, skb->data, dataddr, skb->len);
 719	ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
 720	tmp = priv(dev)->tx_link;
 721	priv(dev)->tx_link = nopaddr;
 722
 723	/* now reset the previous nop pointer */
 724	ether1_writew(dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);
 725
 726	local_irq_restore(flags);
 727
 728	/* handle transmit */
 729
 730	/* check to see if we have room for a full sized ether frame */
 731	tmp = priv(dev)->tx_head;
 732	tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
 733	priv(dev)->tx_head = tmp;
 734	dev_kfree_skb (skb);
 735
 736	if (tst == -1)
 737		netif_stop_queue(dev);
 738
 739 out:
 740	return NETDEV_TX_OK;
 741}
 742
 743static void
 744ether1_xmit_done (struct net_device *dev)
 745{
 746	nop_t nop;
 747	int caddr, tst;
 748
 749	caddr = priv(dev)->tx_tail;
 750
 751again:
 752	ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
 753
 754	switch (nop.nop_command & CMD_MASK) {
 755	case CMD_TDR:
 756		/* special case */
 757		if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
 758				!= (unsigned short)I82586_NULL) {
 759			ether1_writew(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
 760				    scb_command, NORMALIRQS);
 761			writeb(CTRL_CA, REG_CONTROL);
 762		}
 763		priv(dev)->tx_tail = NOP_ADDR;
 764		return;
 765
 766	case CMD_NOP:
 767		if (nop.nop_link == caddr) {
 768			if (priv(dev)->initialising == 0)
 769				printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
 770			else
 771			        priv(dev)->initialising = 0;
 772			return;
 773		}
 774		if (caddr == nop.nop_link)
 775			return;
 776		caddr = nop.nop_link;
 777		goto again;
 778
 779	case CMD_TX:
 780		if (nop.nop_status & STAT_COMPLETE)
 781			break;
 782		printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name);
 783		priv(dev)->restart = 1;
 784		return;
 785
 786	default:
 787		printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
 788			nop.nop_command & CMD_MASK, caddr);
 789		priv(dev)->restart = 1;
 790		return;
 791	}
 792
 793	while (nop.nop_status & STAT_COMPLETE) {
 794		if (nop.nop_status & STAT_OK) {
 795			dev->stats.tx_packets++;
 796			dev->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
 797		} else {
 798			dev->stats.tx_errors++;
 799
 800			if (nop.nop_status & STAT_COLLAFTERTX)
 801				dev->stats.collisions++;
 802			if (nop.nop_status & STAT_NOCARRIER)
 803				dev->stats.tx_carrier_errors++;
 804			if (nop.nop_status & STAT_TXLOSTCTS)
 805				printk (KERN_WARNING "%s: cts lost\n", dev->name);
 806			if (nop.nop_status & STAT_TXSLOWDMA)
 807				dev->stats.tx_fifo_errors++;
 808			if (nop.nop_status & STAT_COLLEXCESSIVE)
 809				dev->stats.collisions += 16;
 810		}
 811
 812		if (nop.nop_link == caddr) {
 813			printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name);
 814			break;
 815		}
 816
 817		caddr = nop.nop_link;
 818		ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
 819		if ((nop.nop_command & CMD_MASK) != CMD_NOP) {
 820			printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name);
 821			break;
 822		}
 823
 824		if (caddr == nop.nop_link)
 825			break;
 826
 827		caddr = nop.nop_link;
 828		ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
 829		if ((nop.nop_command & CMD_MASK) != CMD_TX) {
 830			printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name);
 831			break;
 832		}
 833	}
 834	priv(dev)->tx_tail = caddr;
 835
 836	caddr = priv(dev)->tx_head;
 837	tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
 838	priv(dev)->tx_head = caddr;
 839	if (tst != -1)
 840		netif_wake_queue(dev);
 841}
 842
 843static void
 844ether1_recv_done (struct net_device *dev)
 845{
 846	int status;
 847	int nexttail, rbdaddr;
 848	rbd_t rbd;
 849
 850	do {
 851		status = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_status, NORMALIRQS);
 852		if ((status & RFD_COMPLETE) == 0)
 853			break;
 854
 855		rbdaddr = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS);
 856		ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE);
 857
 858		if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) {
 859			int length = rbd.rbd_status & RBD_ACNT;
 860			struct sk_buff *skb;
 861
 862			length = (length + 1) & ~1;
 863			skb = netdev_alloc_skb(dev, length + 2);
 864
 865			if (skb) {
 866				skb_reserve (skb, 2);
 867
 868				ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length);
 869
 870				skb->protocol = eth_type_trans (skb, dev);
 871				netif_rx (skb);
 872				dev->stats.rx_packets++;
 873			} else
 874				dev->stats.rx_dropped++;
 875		} else {
 876			printk(KERN_WARNING "%s: %s\n", dev->name,
 877				(rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
 878			dev->stats.rx_dropped++;
 879		}
 880
 881		nexttail = ether1_readw(dev, priv(dev)->rx_tail, rfd_t, rfd_link, NORMALIRQS);
 882		/* nexttail should be rx_head */
 883		if (nexttail != priv(dev)->rx_head)
 884			printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
 885				dev->name, nexttail, priv(dev)->rx_head);
 886		ether1_writew(dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
 887		ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_command, NORMALIRQS);
 888		ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_status, NORMALIRQS);
 889		ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
 890	
 891		priv(dev)->rx_tail = nexttail;
 892		priv(dev)->rx_head = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_link, NORMALIRQS);
 893	} while (1);
 894}
 895
 896static irqreturn_t
 897ether1_interrupt (int irq, void *dev_id)
 898{
 899	struct net_device *dev = (struct net_device *)dev_id;
 900	int status;
 901
 902	status = ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);
 903
 904	if (status) {
 905		ether1_writew(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
 906			    SCB_ADDR, scb_t, scb_command, NORMALIRQS);
 907		writeb(CTRL_CA | CTRL_ACK, REG_CONTROL);
 908		if (status & SCB_STCX) {
 909			ether1_xmit_done (dev);
 910		}
 911		if (status & SCB_STCNA) {
 912			if (priv(dev)->resetting == 0)
 913				printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
 914			else
 915				priv(dev)->resetting += 1;
 916			if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
 917					!= (unsigned short)I82586_NULL) {
 918				ether1_writew(dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
 919				writeb(CTRL_CA, REG_CONTROL);
 920			}
 921			if (priv(dev)->resetting == 2)
 922				priv(dev)->resetting = 0;
 923		}
 924		if (status & SCB_STFR) {
 925			ether1_recv_done (dev);
 926		}
 927		if (status & SCB_STRNR) {
 928			if (ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) {
 929				printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
 930				ether1_writew(dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
 931				writeb(CTRL_CA, REG_CONTROL);
 932				dev->stats.rx_dropped++;	/* we suspended due to lack of buffer space */
 933			} else
 934				printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name,
 935					ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
 936			printk (KERN_WARNING "RU ptr = %04X\n", ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset,
 937						NORMALIRQS));
 938		}
 939	} else
 940		writeb(CTRL_ACK, REG_CONTROL);
 941
 942	return IRQ_HANDLED;
 943}
 944
 945static int
 946ether1_close (struct net_device *dev)
 947{
 948	ether1_reset (dev);
 949
 950	free_irq(dev->irq, dev);
 951
 952	return 0;
 953}
 954
 955/*
 956 * Set or clear the multicast filter for this adaptor.
 957 * num_addrs == -1	Promiscuous mode, receive all packets.
 958 * num_addrs == 0	Normal mode, clear multicast list.
 959 * num_addrs > 0	Multicast mode, receive normal and MC packets, and do
 960 *			best-effort filtering.
 961 */
 962static void
 963ether1_setmulticastlist (struct net_device *dev)
 964{
 965}
 966
 967/* ------------------------------------------------------------------------- */
 968
 969static void ether1_banner(void)
 970{
 971	static unsigned int version_printed = 0;
 972
 973	if (net_debug && version_printed++ == 0)
 974		printk(KERN_INFO "%s", version);
 975}
 976
 977static const struct net_device_ops ether1_netdev_ops = {
 978	.ndo_open		= ether1_open,
 979	.ndo_stop		= ether1_close,
 980	.ndo_start_xmit		= ether1_sendpacket,
 981	.ndo_set_rx_mode	= ether1_setmulticastlist,
 982	.ndo_tx_timeout		= ether1_timeout,
 983	.ndo_validate_addr	= eth_validate_addr,
 984	.ndo_change_mtu		= eth_change_mtu,
 985	.ndo_set_mac_address	= eth_mac_addr,
 986};
 987
 988static int
 989ether1_probe(struct expansion_card *ec, const struct ecard_id *id)
 990{
 991	struct net_device *dev;
 992	int i, ret = 0;
 993
 994	ether1_banner();
 995
 996	ret = ecard_request_resources(ec);
 997	if (ret)
 998		goto out;
 999
1000	dev = alloc_etherdev(sizeof(struct ether1_priv));
1001	if (!dev) {
1002		ret = -ENOMEM;
1003		goto release;
1004	}
1005
1006	SET_NETDEV_DEV(dev, &ec->dev);
1007
1008	dev->irq = ec->irq;
1009	priv(dev)->base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
1010	if (!priv(dev)->base) {
1011		ret = -ENOMEM;
1012		goto free;
1013	}
1014
1015	if ((priv(dev)->bus_type = ether1_reset(dev)) == 0) {
1016		ret = -ENODEV;
1017		goto free;
1018	}
1019
1020	for (i = 0; i < 6; i++)
1021		dev->dev_addr[i] = readb(IDPROM_ADDRESS + (i << 2));
1022
1023	if (ether1_init_2(dev)) {
1024		ret = -ENODEV;
1025		goto free;
1026	}
1027
1028	dev->netdev_ops		= &ether1_netdev_ops;
1029	dev->watchdog_timeo	= 5 * HZ / 100;
1030
1031	ret = register_netdev(dev);
1032	if (ret)
1033		goto free;
1034
1035	printk(KERN_INFO "%s: ether1 in slot %d, %pM\n",
1036		dev->name, ec->slot_no, dev->dev_addr);
1037    
1038	ecard_set_drvdata(ec, dev);
1039	return 0;
1040
1041 free:
1042	free_netdev(dev);
1043 release:
1044	ecard_release_resources(ec);
1045 out:
1046	return ret;
1047}
1048
1049static void ether1_remove(struct expansion_card *ec)
1050{
1051	struct net_device *dev = ecard_get_drvdata(ec);
1052
1053	ecard_set_drvdata(ec, NULL);	
1054
1055	unregister_netdev(dev);
1056	free_netdev(dev);
1057	ecard_release_resources(ec);
1058}
1059
1060static const struct ecard_id ether1_ids[] = {
1061	{ MANU_ACORN, PROD_ACORN_ETHER1 },
1062	{ 0xffff, 0xffff }
1063};
1064
1065static struct ecard_driver ether1_driver = {
1066	.probe		= ether1_probe,
1067	.remove		= ether1_remove,
1068	.id_table	= ether1_ids,
1069	.drv = {
1070		.name	= "ether1",
1071	},
1072};
1073
1074static int __init ether1_init(void)
1075{
1076	return ecard_register_driver(&ether1_driver);
1077}
1078
1079static void __exit ether1_exit(void)
1080{
1081	ecard_remove_driver(&ether1_driver);
1082}
1083
1084module_init(ether1_init);
1085module_exit(ether1_exit);
1086
1087MODULE_LICENSE("GPL");