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Fix dnotify/close race
[linux-2.6.22.y-op.git] / drivers / net / arm / ether1.c
blobf21148e7b579ec3e2242b77394d3431e0a0d3700
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/ptrace.h>
40 #include <linux/ioport.h>
41 #include <linux/in.h>
42 #include <linux/slab.h>
43 #include <linux/string.h>
44 #include <linux/errno.h>
45 #include <linux/device.h>
46 #include <linux/init.h>
47 #include <linux/netdevice.h>
48 #include <linux/etherdevice.h>
49 #include <linux/skbuff.h>
50 #include <linux/bitops.h>
51
52 #include <asm/system.h>
53 #include <asm/io.h>
54 #include <asm/dma.h>
55 #include <asm/ecard.h>
56
57 #define __ETHER1_C
58 #include "ether1.h"
59
60 static unsigned int net_debug = NET_DEBUG;
61
62 #define BUFFER_SIZE 0x10000
63 #define TX_AREA_START 0x00100
64 #define TX_AREA_END 0x05000
65 #define RX_AREA_START 0x05000
66 #define RX_AREA_END 0x0fc00
67
68 static int ether1_open(struct net_device *dev);
69 static int ether1_sendpacket(struct sk_buff *skb, struct net_device *dev);
70 static irqreturn_t ether1_interrupt(int irq, void *dev_id);
71 static int ether1_close(struct net_device *dev);
72 static struct net_device_stats *ether1_getstats(struct net_device *dev);
73 static void ether1_setmulticastlist(struct net_device *dev);
74 static void ether1_timeout(struct net_device *dev);
75
76 /* ------------------------------------------------------------------------- */
77
78 static char version[] __initdata = "ether1 ethernet driver (c) 2000 Russell King v1.07\n";
79
80 #define BUS_16 16
81 #define BUS_8 8
82
83 /* ------------------------------------------------------------------------- */
84
85 #define DISABLEIRQS 1
86 #define NORMALIRQS 0
87
88 #define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
89 #define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs)
90
91 static inline unsigned short
92 ether1_inw_p (struct net_device *dev, int addr, int svflgs)
93 {
94 unsigned long flags;
95 unsigned short ret;
96
97 if (svflgs)
98 local_irq_save (flags);
99
100 writeb(addr >> 12, REG_PAGE);
101 ret = readw(ETHER1_RAM + ((addr & 4095) << 1));
102 if (svflgs)
103 local_irq_restore (flags);
104 return ret;
105 }
106
107 static inline void
108 ether1_outw_p (struct net_device *dev, unsigned short val, int addr, int svflgs)
109 {
110 unsigned long flags;
111
112 if (svflgs)
113 local_irq_save (flags);
114
115 writeb(addr >> 12, REG_PAGE);
116 writew(val, ETHER1_RAM + ((addr & 4095) << 1));
117 if (svflgs)
118 local_irq_restore (flags);
119 }
120
121 /*
122 * Some inline assembler to allow fast transfers on to/off of the card.
123 * Since this driver depends on some features presented by the ARM
124 * specific architecture, and that you can't configure this driver
125 * without specifiing ARM mode, this is not a problem.
126 *
127 * This routine is essentially an optimised memcpy from the card's
128 * onboard RAM to kernel memory.
129 */
130 static void
131 ether1_writebuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
132 {
133 unsigned int page, thislen, offset;
134 void __iomem *addr;
135
136 offset = start & 4095;
137 page = start >> 12;
138 addr = ETHER1_RAM + (offset << 1);
139
140 if (offset + length > 4096)
141 thislen = 4096 - offset;
142 else
143 thislen = length;
144
145 do {
146 int used;
147
148 writeb(page, REG_PAGE);
149 length -= thislen;
150
151 __asm__ __volatile__(
152 "subs %3, %3, #2\n\
153 bmi 2f\n\
154 1: ldr %0, [%1], #2\n\
155 mov %0, %0, lsl #16\n\
156 orr %0, %0, %0, lsr #16\n\
157 str %0, [%2], #4\n\
158 subs %3, %3, #2\n\
159 bmi 2f\n\
160 ldr %0, [%1], #2\n\
161 mov %0, %0, lsl #16\n\
162 orr %0, %0, %0, lsr #16\n\
163 str %0, [%2], #4\n\
164 subs %3, %3, #2\n\
165 bmi 2f\n\
166 ldr %0, [%1], #2\n\
167 mov %0, %0, lsl #16\n\
168 orr %0, %0, %0, lsr #16\n\
169 str %0, [%2], #4\n\
170 subs %3, %3, #2\n\
171 bmi 2f\n\
172 ldr %0, [%1], #2\n\
173 mov %0, %0, lsl #16\n\
174 orr %0, %0, %0, lsr #16\n\
175 str %0, [%2], #4\n\
176 subs %3, %3, #2\n\
177 bpl 1b\n\
178 2: adds %3, %3, #1\n\
179 ldreqb %0, [%1]\n\
180 streqb %0, [%2]"
181 : "=&r" (used), "=&r" (data)
182 : "r" (addr), "r" (thislen), "1" (data));
183
184 addr = ETHER1_RAM;
185
186 thislen = length;
187 if (thislen > 4096)
188 thislen = 4096;
189 page++;
190 } while (thislen);
191 }
192
193 static void
194 ether1_readbuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
195 {
196 unsigned int page, thislen, offset;
197 void __iomem *addr;
198
199 offset = start & 4095;
200 page = start >> 12;
201 addr = ETHER1_RAM + (offset << 1);
202
203 if (offset + length > 4096)
204 thislen = 4096 - offset;
205 else
206 thislen = length;
207
208 do {
209 int used;
210
211 writeb(page, REG_PAGE);
212 length -= thislen;
213
214 __asm__ __volatile__(
215 "subs %3, %3, #2\n\
216 bmi 2f\n\
217 1: ldr %0, [%2], #4\n\
218 strb %0, [%1], #1\n\
219 mov %0, %0, lsr #8\n\
220 strb %0, [%1], #1\n\
221 subs %3, %3, #2\n\
222 bmi 2f\n\
223 ldr %0, [%2], #4\n\
224 strb %0, [%1], #1\n\
225 mov %0, %0, lsr #8\n\
226 strb %0, [%1], #1\n\
227 subs %3, %3, #2\n\
228 bmi 2f\n\
229 ldr %0, [%2], #4\n\
230 strb %0, [%1], #1\n\
231 mov %0, %0, lsr #8\n\
232 strb %0, [%1], #1\n\
233 subs %3, %3, #2\n\
234 bmi 2f\n\
235 ldr %0, [%2], #4\n\
236 strb %0, [%1], #1\n\
237 mov %0, %0, lsr #8\n\
238 strb %0, [%1], #1\n\
239 subs %3, %3, #2\n\
240 bpl 1b\n\
241 2: adds %3, %3, #1\n\
242 ldreqb %0, [%2]\n\
243 streqb %0, [%1]"
244 : "=&r" (used), "=&r" (data)
245 : "r" (addr), "r" (thislen), "1" (data));
246
247 addr = ETHER1_RAM;
248
249 thislen = length;
250 if (thislen > 4096)
251 thislen = 4096;
252 page++;
253 } while (thislen);
254 }
255
256 static int __devinit
257 ether1_ramtest(struct net_device *dev, unsigned char byte)
258 {
259 unsigned char *buffer = kmalloc (BUFFER_SIZE, GFP_KERNEL);
260 int i, ret = BUFFER_SIZE;
261 int max_errors = 15;
262 int bad = -1;
263 int bad_start = 0;
264
265 if (!buffer)
266 return 1;
267
268 memset (buffer, byte, BUFFER_SIZE);
269 ether1_writebuffer (dev, buffer, 0, BUFFER_SIZE);
270 memset (buffer, byte ^ 0xff, BUFFER_SIZE);
271 ether1_readbuffer (dev, buffer, 0, BUFFER_SIZE);
272
273 for (i = 0; i < BUFFER_SIZE; i++) {
274 if (buffer[i] != byte) {
275 if (max_errors >= 0 && bad != buffer[i]) {
276 if (bad != -1)
277 printk ("\n");
278 printk (KERN_CRIT "%s: RAM failed with (%02X instead of %02X) at 0x%04X",
279 dev->name, buffer[i], byte, i);
280 ret = -ENODEV;
281 max_errors --;
282 bad = buffer[i];
283 bad_start = i;
284 }
285 } else {
286 if (bad != -1) {
287 if (bad_start == i - 1)
288 printk ("\n");
289 else
290 printk (" - 0x%04X\n", i - 1);
291 bad = -1;
292 }
293 }
294 }
295
296 if (bad != -1)
297 printk (" - 0x%04X\n", BUFFER_SIZE);
298 kfree (buffer);
299
300 return ret;
301 }
302
303 static int
304 ether1_reset (struct net_device *dev)
305 {
306 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
307 return BUS_16;
308 }
309
310 static int __devinit
311 ether1_init_2(struct net_device *dev)
312 {
313 int i;
314 dev->mem_start = 0;
315
316 i = ether1_ramtest (dev, 0x5a);
317
318 if (i > 0)
319 i = ether1_ramtest (dev, 0x1e);
320
321 if (i <= 0)
322 return -ENODEV;
323
324 dev->mem_end = i;
325 return 0;
326 }
327
328 /*
329 * These are the structures that are loaded into the ether RAM card to
330 * initialise the 82586
331 */
332
333 /* at 0x0100 */
334 #define NOP_ADDR (TX_AREA_START)
335 #define NOP_SIZE (0x06)
336 static nop_t init_nop = {
337 0,
338 CMD_NOP,
339 NOP_ADDR
340 };
341
342 /* at 0x003a */
343 #define TDR_ADDR (0x003a)
344 #define TDR_SIZE (0x08)
345 static tdr_t init_tdr = {
346 0,
347 CMD_TDR | CMD_INTR,
348 NOP_ADDR,
349 0
350 };
351
352 /* at 0x002e */
353 #define MC_ADDR (0x002e)
354 #define MC_SIZE (0x0c)
355 static mc_t init_mc = {
356 0,
357 CMD_SETMULTICAST,
358 TDR_ADDR,
359 0,
360 { { 0, } }
361 };
362
363 /* at 0x0022 */
364 #define SA_ADDR (0x0022)
365 #define SA_SIZE (0x0c)
366 static sa_t init_sa = {
367 0,
368 CMD_SETADDRESS,
369 MC_ADDR,
370 { 0, }
371 };
372
373 /* at 0x0010 */
374 #define CFG_ADDR (0x0010)
375 #define CFG_SIZE (0x12)
376 static cfg_t init_cfg = {
377 0,
378 CMD_CONFIG,
379 SA_ADDR,
380 8,
381 8,
382 CFG8_SRDY,
383 CFG9_PREAMB8 | CFG9_ADDRLENBUF | CFG9_ADDRLEN(6),
384 0,
385 0x60,
386 0,
387 CFG13_RETRY(15) | CFG13_SLOTH(2),
388 0,
389 };
390
391 /* at 0x0000 */
392 #define SCB_ADDR (0x0000)
393 #define SCB_SIZE (0x10)
394 static scb_t init_scb = {
395 0,
396 SCB_CMDACKRNR | SCB_CMDACKCNA | SCB_CMDACKFR | SCB_CMDACKCX,
397 CFG_ADDR,
398 RX_AREA_START,
399 0,
400 0,
401 0,
402 0
403 };
404
405 /* at 0xffee */
406 #define ISCP_ADDR (0xffee)
407 #define ISCP_SIZE (0x08)
408 static iscp_t init_iscp = {
409 1,
410 SCB_ADDR,
411 0x0000,
412 0x0000
413 };
414
415 /* at 0xfff6 */
416 #define SCP_ADDR (0xfff6)
417 #define SCP_SIZE (0x0a)
418 static scp_t init_scp = {
419 SCP_SY_16BBUS,
420 { 0, 0 },
421 ISCP_ADDR,
422 0
423 };
424
425 #define RFD_SIZE (0x16)
426 static rfd_t init_rfd = {
427 0,
428 0,
429 0,
430 0,
431 { 0, },
432 { 0, },
433 0
434 };
435
436 #define RBD_SIZE (0x0a)
437 static rbd_t init_rbd = {
438 0,
439 0,
440 0,
441 0,
442 ETH_FRAME_LEN + 8
443 };
444
445 #define TX_SIZE (0x08)
446 #define TBD_SIZE (0x08)
447
448 static int
449 ether1_init_for_open (struct net_device *dev)
450 {
451 int i, status, addr, next, next2;
452 int failures = 0;
453 unsigned long timeout;
454
455 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
456
457 for (i = 0; i < 6; i++)
458 init_sa.sa_addr[i] = dev->dev_addr[i];
459
460 /* load data structures into ether1 RAM */
461 ether1_writebuffer (dev, &init_scp, SCP_ADDR, SCP_SIZE);
462 ether1_writebuffer (dev, &init_iscp, ISCP_ADDR, ISCP_SIZE);
463 ether1_writebuffer (dev, &init_scb, SCB_ADDR, SCB_SIZE);
464 ether1_writebuffer (dev, &init_cfg, CFG_ADDR, CFG_SIZE);
465 ether1_writebuffer (dev, &init_sa, SA_ADDR, SA_SIZE);
466 ether1_writebuffer (dev, &init_mc, MC_ADDR, MC_SIZE);
467 ether1_writebuffer (dev, &init_tdr, TDR_ADDR, TDR_SIZE);
468 ether1_writebuffer (dev, &init_nop, NOP_ADDR, NOP_SIZE);
469
470 if (ether1_readw(dev, CFG_ADDR, cfg_t, cfg_command, NORMALIRQS) != CMD_CONFIG) {
471 printk (KERN_ERR "%s: detected either RAM fault or compiler bug\n",
472 dev->name);
473 return 1;
474 }
475
476 /*
477 * setup circularly linked list of { rfd, rbd, buffer }, with
478 * all rfds circularly linked, rbds circularly linked.
479 * First rfd is linked to scp, first rbd is linked to first
480 * rfd. Last rbd has a suspend command.
481 */
482 addr = RX_AREA_START;
483 do {
484 next = addr + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
485 next2 = next + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
486
487 if (next2 >= RX_AREA_END) {
488 next = RX_AREA_START;
489 init_rfd.rfd_command = RFD_CMDEL | RFD_CMDSUSPEND;
490 priv(dev)->rx_tail = addr;
491 } else
492 init_rfd.rfd_command = 0;
493 if (addr == RX_AREA_START)
494 init_rfd.rfd_rbdoffset = addr + RFD_SIZE;
495 else
496 init_rfd.rfd_rbdoffset = 0;
497 init_rfd.rfd_link = next;
498 init_rbd.rbd_link = next + RFD_SIZE;
499 init_rbd.rbd_bufl = addr + RFD_SIZE + RBD_SIZE;
500
501 ether1_writebuffer (dev, &init_rfd, addr, RFD_SIZE);
502 ether1_writebuffer (dev, &init_rbd, addr + RFD_SIZE, RBD_SIZE);
503 addr = next;
504 } while (next2 < RX_AREA_END);
505
506 priv(dev)->tx_link = NOP_ADDR;
507 priv(dev)->tx_head = NOP_ADDR + NOP_SIZE;
508 priv(dev)->tx_tail = TDR_ADDR;
509 priv(dev)->rx_head = RX_AREA_START;
510
511 /* release reset & give 586 a prod */
512 priv(dev)->resetting = 1;
513 priv(dev)->initialising = 1;
514 writeb(CTRL_RST, REG_CONTROL);
515 writeb(0, REG_CONTROL);
516 writeb(CTRL_CA, REG_CONTROL);
517
518 /* 586 should now unset iscp.busy */
519 timeout = jiffies + HZ/2;
520 while (ether1_readw(dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) {
521 if (time_after(jiffies, timeout)) {
522 printk (KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name);
523 return 1;
524 }
525 }
526
527 /* check status of commands that we issued */
528 timeout += HZ/10;
529 while (((status = ether1_readw(dev, CFG_ADDR, cfg_t, cfg_status, DISABLEIRQS))
530 & STAT_COMPLETE) == 0) {
531 if (time_after(jiffies, timeout))
532 break;
533 }
534
535 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
536 printk (KERN_WARNING "%s: can't initialise 82586: config status %04X\n", dev->name, status);
537 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
538 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
539 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
540 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
541 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
542 failures += 1;
543 }
544
545 timeout += HZ/10;
546 while (((status = ether1_readw(dev, SA_ADDR, sa_t, sa_status, DISABLEIRQS))
547 & STAT_COMPLETE) == 0) {
548 if (time_after(jiffies, timeout))
549 break;
550 }
551
552 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
553 printk (KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status);
554 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
555 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
556 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
557 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
558 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
559 failures += 1;
560 }
561
562 timeout += HZ/10;
563 while (((status = ether1_readw(dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS))
564 & STAT_COMPLETE) == 0) {
565 if (time_after(jiffies, timeout))
566 break;
567 }
568
569 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
570 printk (KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status);
571 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
572 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
573 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
574 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
575 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
576 failures += 1;
577 }
578
579 timeout += HZ;
580 while (((status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS))
581 & STAT_COMPLETE) == 0) {
582 if (time_after(jiffies, timeout))
583 break;
584 }
585
586 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
587 printk (KERN_WARNING "%s: can't tdr (ignored)\n", dev->name);
588 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
589 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
590 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
591 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
592 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
593 } else {
594 status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS);
595 if (status & TDR_XCVRPROB)
596 printk (KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name);
597 else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) {
598 #ifdef FANCY
599 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name,
600 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10,
601 (status & TDR_TIME) % 10);
602 #else
603 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d clks away\n", dev->name,
604 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME));
605 #endif
606 }
607 }
608
609 if (failures)
610 ether1_reset (dev);
611 return failures ? 1 : 0;
612 }
613
614 /* ------------------------------------------------------------------------- */
615
616 static int
617 ether1_txalloc (struct net_device *dev, int size)
618 {
619 int start, tail;
620
621 size = (size + 1) & ~1;
622 tail = priv(dev)->tx_tail;
623
624 if (priv(dev)->tx_head + size > TX_AREA_END) {
625 if (tail > priv(dev)->tx_head)
626 return -1;
627 start = TX_AREA_START;
628 if (start + size > tail)
629 return -1;
630 priv(dev)->tx_head = start + size;
631 } else {
632 if (priv(dev)->tx_head < tail && (priv(dev)->tx_head + size) > tail)
633 return -1;
634 start = priv(dev)->tx_head;
635 priv(dev)->tx_head += size;
636 }
637
638 return start;
639 }
640
641 static int
642 ether1_open (struct net_device *dev)
643 {
644 if (!is_valid_ether_addr(dev->dev_addr)) {
645 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
646 dev->name);
647 return -EINVAL;
648 }
649
650 if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev))
651 return -EAGAIN;
652
653 memset (&priv(dev)->stats, 0, sizeof (struct net_device_stats));
654
655 if (ether1_init_for_open (dev)) {
656 free_irq (dev->irq, dev);
657 return -EAGAIN;
658 }
659
660 netif_start_queue(dev);
661
662 return 0;
663 }
664
665 static void
666 ether1_timeout(struct net_device *dev)
667 {
668 printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n",
669 dev->name);
670 printk(KERN_WARNING "%s: resetting device\n", dev->name);
671
672 ether1_reset (dev);
673
674 if (ether1_init_for_open (dev))
675 printk (KERN_ERR "%s: unable to restart interface\n", dev->name);
676
677 priv(dev)->stats.tx_errors++;
678 netif_wake_queue(dev);
679 }
680
681 static int
682 ether1_sendpacket (struct sk_buff *skb, struct net_device *dev)
683 {
684 int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
685 unsigned long flags;
686 tx_t tx;
687 tbd_t tbd;
688 nop_t nop;
689
690 if (priv(dev)->restart) {
691 printk(KERN_WARNING "%s: resetting device\n", dev->name);
692
693 ether1_reset(dev);
694
695 if (ether1_init_for_open(dev))
696 printk(KERN_ERR "%s: unable to restart interface\n", dev->name);
697 else
698 priv(dev)->restart = 0;
699 }
700
701 if (skb->len < ETH_ZLEN) {
702 if (skb_padto(skb, ETH_ZLEN))
703 goto out;
704 }
705
706 /*
707 * insert packet followed by a nop
708 */
709 txaddr = ether1_txalloc (dev, TX_SIZE);
710 tbdaddr = ether1_txalloc (dev, TBD_SIZE);
711 dataddr = ether1_txalloc (dev, skb->len);
712 nopaddr = ether1_txalloc (dev, NOP_SIZE);
713
714 tx.tx_status = 0;
715 tx.tx_command = CMD_TX | CMD_INTR;
716 tx.tx_link = nopaddr;
717 tx.tx_tbdoffset = tbdaddr;
718 tbd.tbd_opts = TBD_EOL | skb->len;
719 tbd.tbd_link = I82586_NULL;
720 tbd.tbd_bufl = dataddr;
721 tbd.tbd_bufh = 0;
722 nop.nop_status = 0;
723 nop.nop_command = CMD_NOP;
724 nop.nop_link = nopaddr;
725
726 local_irq_save(flags);
727 ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
728 ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
729 ether1_writebuffer (dev, skb->data, dataddr, skb->len);
730 ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
731 tmp = priv(dev)->tx_link;
732 priv(dev)->tx_link = nopaddr;
733
734 /* now reset the previous nop pointer */
735 ether1_writew(dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);
736
737 local_irq_restore(flags);
738
739 /* handle transmit */
740 dev->trans_start = jiffies;
741
742 /* check to see if we have room for a full sized ether frame */
743 tmp = priv(dev)->tx_head;
744 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
745 priv(dev)->tx_head = tmp;
746 dev_kfree_skb (skb);
747
748 if (tst == -1)
749 netif_stop_queue(dev);
750
751 out:
752 return 0;
753 }
754
755 static void
756 ether1_xmit_done (struct net_device *dev)
757 {
758 nop_t nop;
759 int caddr, tst;
760
761 caddr = priv(dev)->tx_tail;
762
763 again:
764 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
765
766 switch (nop.nop_command & CMD_MASK) {
767 case CMD_TDR:
768 /* special case */
769 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
770 != (unsigned short)I82586_NULL) {
771 ether1_writew(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
772 scb_command, NORMALIRQS);
773 writeb(CTRL_CA, REG_CONTROL);
774 }
775 priv(dev)->tx_tail = NOP_ADDR;
776 return;
777
778 case CMD_NOP:
779 if (nop.nop_link == caddr) {
780 if (priv(dev)->initialising == 0)
781 printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
782 else
783 priv(dev)->initialising = 0;
784 return;
785 }
786 if (caddr == nop.nop_link)
787 return;
788 caddr = nop.nop_link;
789 goto again;
790
791 case CMD_TX:
792 if (nop.nop_status & STAT_COMPLETE)
793 break;
794 printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name);
795 priv(dev)->restart = 1;
796 return;
797
798 default:
799 printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
800 nop.nop_command & CMD_MASK, caddr);
801 priv(dev)->restart = 1;
802 return;
803 }
804
805 while (nop.nop_status & STAT_COMPLETE) {
806 if (nop.nop_status & STAT_OK) {
807 priv(dev)->stats.tx_packets ++;
808 priv(dev)->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
809 } else {
810 priv(dev)->stats.tx_errors ++;
811
812 if (nop.nop_status & STAT_COLLAFTERTX)
813 priv(dev)->stats.collisions ++;
814 if (nop.nop_status & STAT_NOCARRIER)
815 priv(dev)->stats.tx_carrier_errors ++;
816 if (nop.nop_status & STAT_TXLOSTCTS)
817 printk (KERN_WARNING "%s: cts lost\n", dev->name);
818 if (nop.nop_status & STAT_TXSLOWDMA)
819 priv(dev)->stats.tx_fifo_errors ++;
820 if (nop.nop_status & STAT_COLLEXCESSIVE)
821 priv(dev)->stats.collisions += 16;
822 }
823
824 if (nop.nop_link == caddr) {
825 printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name);
826 break;
827 }
828
829 caddr = nop.nop_link;
830 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
831 if ((nop.nop_command & CMD_MASK) != CMD_NOP) {
832 printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name);
833 break;
834 }
835
836 if (caddr == nop.nop_link)
837 break;
838
839 caddr = nop.nop_link;
840 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
841 if ((nop.nop_command & CMD_MASK) != CMD_TX) {
842 printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name);
843 break;
844 }
845 }
846 priv(dev)->tx_tail = caddr;
847
848 caddr = priv(dev)->tx_head;
849 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
850 priv(dev)->tx_head = caddr;
851 if (tst != -1)
852 netif_wake_queue(dev);
853 }
854
855 static void
856 ether1_recv_done (struct net_device *dev)
857 {
858 int status;
859 int nexttail, rbdaddr;
860 rbd_t rbd;
861
862 do {
863 status = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_status, NORMALIRQS);
864 if ((status & RFD_COMPLETE) == 0)
865 break;
866
867 rbdaddr = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS);
868 ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE);
869
870 if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) {
871 int length = rbd.rbd_status & RBD_ACNT;
872 struct sk_buff *skb;
873
874 length = (length + 1) & ~1;
875 skb = dev_alloc_skb (length + 2);
876
877 if (skb) {
878 skb_reserve (skb, 2);
879
880 ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length);
881
882 skb->protocol = eth_type_trans (skb, dev);
883 netif_rx (skb);
884 priv(dev)->stats.rx_packets ++;
885 } else
886 priv(dev)->stats.rx_dropped ++;
887 } else {
888 printk(KERN_WARNING "%s: %s\n", dev->name,
889 (rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
890 priv(dev)->stats.rx_dropped ++;
891 }
892
893 nexttail = ether1_readw(dev, priv(dev)->rx_tail, rfd_t, rfd_link, NORMALIRQS);
894 /* nexttail should be rx_head */
895 if (nexttail != priv(dev)->rx_head)
896 printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
897 dev->name, nexttail, priv(dev)->rx_head);
898 ether1_writew(dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
899 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_command, NORMALIRQS);
900 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_status, NORMALIRQS);
901 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
902
903 priv(dev)->rx_tail = nexttail;
904 priv(dev)->rx_head = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_link, NORMALIRQS);
905 } while (1);
906 }
907
908 static irqreturn_t
909 ether1_interrupt (int irq, void *dev_id)
910 {
911 struct net_device *dev = (struct net_device *)dev_id;
912 int status;
913
914 status = ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);
915
916 if (status) {
917 ether1_writew(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
918 SCB_ADDR, scb_t, scb_command, NORMALIRQS);
919 writeb(CTRL_CA | CTRL_ACK, REG_CONTROL);
920 if (status & SCB_STCX) {
921 ether1_xmit_done (dev);
922 }
923 if (status & SCB_STCNA) {
924 if (priv(dev)->resetting == 0)
925 printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
926 else
927 priv(dev)->resetting += 1;
928 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
929 != (unsigned short)I82586_NULL) {
930 ether1_writew(dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
931 writeb(CTRL_CA, REG_CONTROL);
932 }
933 if (priv(dev)->resetting == 2)
934 priv(dev)->resetting = 0;
935 }
936 if (status & SCB_STFR) {
937 ether1_recv_done (dev);
938 }
939 if (status & SCB_STRNR) {
940 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) {
941 printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
942 ether1_writew(dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
943 writeb(CTRL_CA, REG_CONTROL);
944 priv(dev)->stats.rx_dropped ++; /* we suspended due to lack of buffer space */
945 } else
946 printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name,
947 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
948 printk (KERN_WARNING "RU ptr = %04X\n", ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset,
949 NORMALIRQS));
950 }
951 } else
952 writeb(CTRL_ACK, REG_CONTROL);
953
954 return IRQ_HANDLED;
955 }
956
957 static int
958 ether1_close (struct net_device *dev)
959 {
960 ether1_reset (dev);
961
962 free_irq(dev->irq, dev);
963
964 return 0;
965 }
966
967 static struct net_device_stats *
968 ether1_getstats (struct net_device *dev)
969 {
970 return &priv(dev)->stats;
971 }
972
973 /*
974 * Set or clear the multicast filter for this adaptor.
975 * num_addrs == -1 Promiscuous mode, receive all packets.
976 * num_addrs == 0 Normal mode, clear multicast list.
977 * num_addrs > 0 Multicast mode, receive normal and MC packets, and do
978 * best-effort filtering.
979 */
980 static void
981 ether1_setmulticastlist (struct net_device *dev)
982 {
983 }
984
985 /* ------------------------------------------------------------------------- */
986
987 static void __devinit ether1_banner(void)
988 {
989 static unsigned int version_printed = 0;
990
991 if (net_debug && version_printed++ == 0)
992 printk(KERN_INFO "%s", version);
993 }
994
995 static int __devinit
996 ether1_probe(struct expansion_card *ec, const struct ecard_id *id)
997 {
998 struct net_device *dev;
999 int i, ret = 0;
1000
1001 ether1_banner();
1002
1003 ret = ecard_request_resources(ec);
1004 if (ret)
1005 goto out;
1006
1007 dev = alloc_etherdev(sizeof(struct ether1_priv));
1008 if (!dev) {
1009 ret = -ENOMEM;
1010 goto release;
1011 }
1012
1013 SET_MODULE_OWNER(dev);
1014 SET_NETDEV_DEV(dev, &ec->dev);
1015
1016 dev->irq = ec->irq;
1017 priv(dev)->base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
1018 if (!priv(dev)->base) {
1019 ret = -ENOMEM;
1020 goto free;
1021 }
1022
1023 if ((priv(dev)->bus_type = ether1_reset(dev)) == 0) {
1024 ret = -ENODEV;
1025 goto free;
1026 }
1027
1028 for (i = 0; i < 6; i++)
1029 dev->dev_addr[i] = readb(IDPROM_ADDRESS + (i << 2));
1030
1031 if (ether1_init_2(dev)) {
1032 ret = -ENODEV;
1033 goto free;
1034 }
1035
1036 dev->open = ether1_open;
1037 dev->stop = ether1_close;
1038 dev->hard_start_xmit = ether1_sendpacket;
1039 dev->get_stats = ether1_getstats;
1040 dev->set_multicast_list = ether1_setmulticastlist;
1041 dev->tx_timeout = ether1_timeout;
1042 dev->watchdog_timeo = 5 * HZ / 100;
1043
1044 ret = register_netdev(dev);
1045 if (ret)
1046 goto free;
1047
1048 printk(KERN_INFO "%s: ether1 in slot %d, ",
1049 dev->name, ec->slot_no);
1050
1051 for (i = 0; i < 6; i++)
1052 printk ("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
1053
1054 ecard_set_drvdata(ec, dev);
1055 return 0;
1056
1057 free:
1058 free_netdev(dev);
1059 release:
1060 ecard_release_resources(ec);
1061 out:
1062 return ret;
1063 }
1064
1065 static void __devexit ether1_remove(struct expansion_card *ec)
1066 {
1067 struct net_device *dev = ecard_get_drvdata(ec);
1068
1069 ecard_set_drvdata(ec, NULL);
1070
1071 unregister_netdev(dev);
1072 free_netdev(dev);
1073 ecard_release_resources(ec);
1074 }
1075
1076 static const struct ecard_id ether1_ids[] = {
1077 { MANU_ACORN, PROD_ACORN_ETHER1 },
1078 { 0xffff, 0xffff }
1079 };
1080
1081 static struct ecard_driver ether1_driver = {
1082 .probe = ether1_probe,
1083 .remove = __devexit_p(ether1_remove),
1084 .id_table = ether1_ids,
1085 .drv = {
1086 .name = "ether1",
1087 },
1088 };
1089
1090 static int __init ether1_init(void)
1091 {
1092 return ecard_register_driver(&ether1_driver);
1093 }
1094
1095 static void __exit ether1_exit(void)
1096 {
1097 ecard_remove_driver(&ether1_driver);
1098 }
1099
1100 module_init(ether1_init);
1101 module_exit(ether1_exit);
1102
1103 MODULE_LICENSE("GPL");
linux v2.6.22.y-op