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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[] __devinitdata = "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 __devinit
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 __devinit
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 (!is_valid_ether_addr(dev->dev_addr)) {
642 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
643 dev->name);
644 return -EINVAL;
645 }
646
647 if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev))
648 return -EAGAIN;
649
650 if (ether1_init_for_open (dev)) {
651 free_irq (dev->irq, dev);
652 return -EAGAIN;
653 }
654
655 netif_start_queue(dev);
656
657 return 0;
658}
659
660static void
661ether1_timeout(struct net_device *dev)
662{
663 printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n",
664 dev->name);
665 printk(KERN_WARNING "%s: resetting device\n", dev->name);
666
667 ether1_reset (dev);
668
669 if (ether1_init_for_open (dev))
670 printk (KERN_ERR "%s: unable to restart interface\n", dev->name);
671
672 dev->stats.tx_errors++;
673 netif_wake_queue(dev);
674}
675
676static int
677ether1_sendpacket (struct sk_buff *skb, struct net_device *dev)
678{
679 int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
680 unsigned long flags;
681 tx_t tx;
682 tbd_t tbd;
683 nop_t nop;
684
685 if (priv(dev)->restart) {
686 printk(KERN_WARNING "%s: resetting device\n", dev->name);
687
688 ether1_reset(dev);
689
690 if (ether1_init_for_open(dev))
691 printk(KERN_ERR "%s: unable to restart interface\n", dev->name);
692 else
693 priv(dev)->restart = 0;
694 }
695
696 if (skb->len < ETH_ZLEN) {
697 if (skb_padto(skb, ETH_ZLEN))
698 goto out;
699 }
700
701 /*
702 * insert packet followed by a nop
703 */
704 txaddr = ether1_txalloc (dev, TX_SIZE);
705 tbdaddr = ether1_txalloc (dev, TBD_SIZE);
706 dataddr = ether1_txalloc (dev, skb->len);
707 nopaddr = ether1_txalloc (dev, NOP_SIZE);
708
709 tx.tx_status = 0;
710 tx.tx_command = CMD_TX | CMD_INTR;
711 tx.tx_link = nopaddr;
712 tx.tx_tbdoffset = tbdaddr;
713 tbd.tbd_opts = TBD_EOL | skb->len;
714 tbd.tbd_link = I82586_NULL;
715 tbd.tbd_bufl = dataddr;
716 tbd.tbd_bufh = 0;
717 nop.nop_status = 0;
718 nop.nop_command = CMD_NOP;
719 nop.nop_link = nopaddr;
720
721 local_irq_save(flags);
722 ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
723 ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
724 ether1_writebuffer (dev, skb->data, dataddr, skb->len);
725 ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
726 tmp = priv(dev)->tx_link;
727 priv(dev)->tx_link = nopaddr;
728
729 /* now reset the previous nop pointer */
730 ether1_writew(dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);
731
732 local_irq_restore(flags);
733
734 /* handle transmit */
735
736 /* check to see if we have room for a full sized ether frame */
737 tmp = priv(dev)->tx_head;
738 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
739 priv(dev)->tx_head = tmp;
740 dev_kfree_skb (skb);
741
742 if (tst == -1)
743 netif_stop_queue(dev);
744
745 out:
746 return NETDEV_TX_OK;
747}
748
749static void
750ether1_xmit_done (struct net_device *dev)
751{
752 nop_t nop;
753 int caddr, tst;
754
755 caddr = priv(dev)->tx_tail;
756
757again:
758 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
759
760 switch (nop.nop_command & CMD_MASK) {
761 case CMD_TDR:
762 /* special case */
763 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
764 != (unsigned short)I82586_NULL) {
765 ether1_writew(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
766 scb_command, NORMALIRQS);
767 writeb(CTRL_CA, REG_CONTROL);
768 }
769 priv(dev)->tx_tail = NOP_ADDR;
770 return;
771
772 case CMD_NOP:
773 if (nop.nop_link == caddr) {
774 if (priv(dev)->initialising == 0)
775 printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
776 else
777 priv(dev)->initialising = 0;
778 return;
779 }
780 if (caddr == nop.nop_link)
781 return;
782 caddr = nop.nop_link;
783 goto again;
784
785 case CMD_TX:
786 if (nop.nop_status & STAT_COMPLETE)
787 break;
788 printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name);
789 priv(dev)->restart = 1;
790 return;
791
792 default:
793 printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
794 nop.nop_command & CMD_MASK, caddr);
795 priv(dev)->restart = 1;
796 return;
797 }
798
799 while (nop.nop_status & STAT_COMPLETE) {
800 if (nop.nop_status & STAT_OK) {
801 dev->stats.tx_packets++;
802 dev->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
803 } else {
804 dev->stats.tx_errors++;
805
806 if (nop.nop_status & STAT_COLLAFTERTX)
807 dev->stats.collisions++;
808 if (nop.nop_status & STAT_NOCARRIER)
809 dev->stats.tx_carrier_errors++;
810 if (nop.nop_status & STAT_TXLOSTCTS)
811 printk (KERN_WARNING "%s: cts lost\n", dev->name);
812 if (nop.nop_status & STAT_TXSLOWDMA)
813 dev->stats.tx_fifo_errors++;
814 if (nop.nop_status & STAT_COLLEXCESSIVE)
815 dev->stats.collisions += 16;
816 }
817
818 if (nop.nop_link == caddr) {
819 printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name);
820 break;
821 }
822
823 caddr = nop.nop_link;
824 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
825 if ((nop.nop_command & CMD_MASK) != CMD_NOP) {
826 printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name);
827 break;
828 }
829
830 if (caddr == nop.nop_link)
831 break;
832
833 caddr = nop.nop_link;
834 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
835 if ((nop.nop_command & CMD_MASK) != CMD_TX) {
836 printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name);
837 break;
838 }
839 }
840 priv(dev)->tx_tail = caddr;
841
842 caddr = priv(dev)->tx_head;
843 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
844 priv(dev)->tx_head = caddr;
845 if (tst != -1)
846 netif_wake_queue(dev);
847}
848
849static void
850ether1_recv_done (struct net_device *dev)
851{
852 int status;
853 int nexttail, rbdaddr;
854 rbd_t rbd;
855
856 do {
857 status = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_status, NORMALIRQS);
858 if ((status & RFD_COMPLETE) == 0)
859 break;
860
861 rbdaddr = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS);
862 ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE);
863
864 if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) {
865 int length = rbd.rbd_status & RBD_ACNT;
866 struct sk_buff *skb;
867
868 length = (length + 1) & ~1;
869 skb = netdev_alloc_skb(dev, length + 2);
870
871 if (skb) {
872 skb_reserve (skb, 2);
873
874 ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length);
875
876 skb->protocol = eth_type_trans (skb, dev);
877 netif_rx (skb);
878 dev->stats.rx_packets++;
879 } else
880 dev->stats.rx_dropped++;
881 } else {
882 printk(KERN_WARNING "%s: %s\n", dev->name,
883 (rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
884 dev->stats.rx_dropped++;
885 }
886
887 nexttail = ether1_readw(dev, priv(dev)->rx_tail, rfd_t, rfd_link, NORMALIRQS);
888 /* nexttail should be rx_head */
889 if (nexttail != priv(dev)->rx_head)
890 printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
891 dev->name, nexttail, priv(dev)->rx_head);
892 ether1_writew(dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
893 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_command, NORMALIRQS);
894 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_status, NORMALIRQS);
895 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
896
897 priv(dev)->rx_tail = nexttail;
898 priv(dev)->rx_head = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_link, NORMALIRQS);
899 } while (1);
900}
901
902static irqreturn_t
903ether1_interrupt (int irq, void *dev_id)
904{
905 struct net_device *dev = (struct net_device *)dev_id;
906 int status;
907
908 status = ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);
909
910 if (status) {
911 ether1_writew(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
912 SCB_ADDR, scb_t, scb_command, NORMALIRQS);
913 writeb(CTRL_CA | CTRL_ACK, REG_CONTROL);
914 if (status & SCB_STCX) {
915 ether1_xmit_done (dev);
916 }
917 if (status & SCB_STCNA) {
918 if (priv(dev)->resetting == 0)
919 printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
920 else
921 priv(dev)->resetting += 1;
922 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
923 != (unsigned short)I82586_NULL) {
924 ether1_writew(dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
925 writeb(CTRL_CA, REG_CONTROL);
926 }
927 if (priv(dev)->resetting == 2)
928 priv(dev)->resetting = 0;
929 }
930 if (status & SCB_STFR) {
931 ether1_recv_done (dev);
932 }
933 if (status & SCB_STRNR) {
934 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) {
935 printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
936 ether1_writew(dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
937 writeb(CTRL_CA, REG_CONTROL);
938 dev->stats.rx_dropped++; /* we suspended due to lack of buffer space */
939 } else
940 printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name,
941 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
942 printk (KERN_WARNING "RU ptr = %04X\n", ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset,
943 NORMALIRQS));
944 }
945 } else
946 writeb(CTRL_ACK, REG_CONTROL);
947
948 return IRQ_HANDLED;
949}
950
951static int
952ether1_close (struct net_device *dev)
953{
954 ether1_reset (dev);
955
956 free_irq(dev->irq, dev);
957
958 return 0;
959}
960
961/*
962 * Set or clear the multicast filter for this adaptor.
963 * num_addrs == -1 Promiscuous mode, receive all packets.
964 * num_addrs == 0 Normal mode, clear multicast list.
965 * num_addrs > 0 Multicast mode, receive normal and MC packets, and do
966 * best-effort filtering.
967 */
968static void
969ether1_setmulticastlist (struct net_device *dev)
970{
971}
972
973/* ------------------------------------------------------------------------- */
974
975static void __devinit ether1_banner(void)
976{
977 static unsigned int version_printed = 0;
978
979 if (net_debug && version_printed++ == 0)
980 printk(KERN_INFO "%s", version);
981}
982
983static const struct net_device_ops ether1_netdev_ops = {
984 .ndo_open = ether1_open,
985 .ndo_stop = ether1_close,
986 .ndo_start_xmit = ether1_sendpacket,
987 .ndo_set_rx_mode = ether1_setmulticastlist,
988 .ndo_tx_timeout = ether1_timeout,
989 .ndo_validate_addr = eth_validate_addr,
990 .ndo_change_mtu = eth_change_mtu,
991 .ndo_set_mac_address = eth_mac_addr,
992};
993
994static int __devinit
995ether1_probe(struct expansion_card *ec, const struct ecard_id *id)
996{
997 struct net_device *dev;
998 int i, ret = 0;
999
1000 ether1_banner();
1001
1002 ret = ecard_request_resources(ec);
1003 if (ret)
1004 goto out;
1005
1006 dev = alloc_etherdev(sizeof(struct ether1_priv));
1007 if (!dev) {
1008 ret = -ENOMEM;
1009 goto release;
1010 }
1011
1012 SET_NETDEV_DEV(dev, &ec->dev);
1013
1014 dev->irq = ec->irq;
1015 priv(dev)->base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
1016 if (!priv(dev)->base) {
1017 ret = -ENOMEM;
1018 goto free;
1019 }
1020
1021 if ((priv(dev)->bus_type = ether1_reset(dev)) == 0) {
1022 ret = -ENODEV;
1023 goto free;
1024 }
1025
1026 for (i = 0; i < 6; i++)
1027 dev->dev_addr[i] = readb(IDPROM_ADDRESS + (i << 2));
1028
1029 if (ether1_init_2(dev)) {
1030 ret = -ENODEV;
1031 goto free;
1032 }
1033
1034 dev->netdev_ops = ðer1_netdev_ops;
1035 dev->watchdog_timeo = 5 * HZ / 100;
1036
1037 ret = register_netdev(dev);
1038 if (ret)
1039 goto free;
1040
1041 printk(KERN_INFO "%s: ether1 in slot %d, %pM\n",
1042 dev->name, ec->slot_no, dev->dev_addr);
1043
1044 ecard_set_drvdata(ec, dev);
1045 return 0;
1046
1047 free:
1048 free_netdev(dev);
1049 release:
1050 ecard_release_resources(ec);
1051 out:
1052 return ret;
1053}
1054
1055static void __devexit ether1_remove(struct expansion_card *ec)
1056{
1057 struct net_device *dev = ecard_get_drvdata(ec);
1058
1059 ecard_set_drvdata(ec, NULL);
1060
1061 unregister_netdev(dev);
1062 free_netdev(dev);
1063 ecard_release_resources(ec);
1064}
1065
1066static const struct ecard_id ether1_ids[] = {
1067 { MANU_ACORN, PROD_ACORN_ETHER1 },
1068 { 0xffff, 0xffff }
1069};
1070
1071static struct ecard_driver ether1_driver = {
1072 .probe = ether1_probe,
1073 .remove = __devexit_p(ether1_remove),
1074 .id_table = ether1_ids,
1075 .drv = {
1076 .name = "ether1",
1077 },
1078};
1079
1080static int __init ether1_init(void)
1081{
1082 return ecard_register_driver(ðer1_driver);
1083}
1084
1085static void __exit ether1_exit(void)
1086{
1087 ecard_remove_driver(ðer1_driver);
1088}
1089
1090module_init(ether1_init);
1091module_exit(ether1_exit);
1092
1093MODULE_LICENSE("GPL");