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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / net / ethernet / i825xx / ether1.c
blob42e90a97c7a5e6f965cdcc7e6615699a14f7f4e5
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/system.h>
52 #include <asm/io.h>
53 #include <asm/dma.h>
54 #include <asm/ecard.h>
55
56 #define __ETHER1_C
57 #include "ether1.h"
58
59 static unsigned int net_debug = NET_DEBUG;
60
61 #define BUFFER_SIZE 0x10000
62 #define TX_AREA_START 0x00100
63 #define TX_AREA_END 0x05000
64 #define RX_AREA_START 0x05000
65 #define RX_AREA_END 0x0fc00
66
67 static int ether1_open(struct net_device *dev);
68 static int ether1_sendpacket(struct sk_buff *skb, struct net_device *dev);
69 static irqreturn_t ether1_interrupt(int irq, void *dev_id);
70 static int ether1_close(struct net_device *dev);
71 static void ether1_setmulticastlist(struct net_device *dev);
72 static void ether1_timeout(struct net_device *dev);
73
74 /* ------------------------------------------------------------------------- */
75
76 static char version[] __devinitdata = "ether1 ethernet driver (c) 2000 Russell King v1.07\n";
77
78 #define BUS_16 16
79 #define BUS_8 8
80
81 /* ------------------------------------------------------------------------- */
82
83 #define DISABLEIRQS 1
84 #define NORMALIRQS 0
85
86 #define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs)
87 #define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs)
88
89 static inline unsigned short
90 ether1_inw_p (struct net_device *dev, int addr, int svflgs)
91 {
92 unsigned long flags;
93 unsigned short ret;
94
95 if (svflgs)
96 local_irq_save (flags);
97
98 writeb(addr >> 12, REG_PAGE);
99 ret = readw(ETHER1_RAM + ((addr & 4095) << 1));
100 if (svflgs)
101 local_irq_restore (flags);
102 return ret;
103 }
104
105 static inline void
106 ether1_outw_p (struct net_device *dev, unsigned short val, int addr, int svflgs)
107 {
108 unsigned long flags;
109
110 if (svflgs)
111 local_irq_save (flags);
112
113 writeb(addr >> 12, REG_PAGE);
114 writew(val, ETHER1_RAM + ((addr & 4095) << 1));
115 if (svflgs)
116 local_irq_restore (flags);
117 }
118
119 /*
120 * Some inline assembler to allow fast transfers on to/off of the card.
121 * Since this driver depends on some features presented by the ARM
122 * specific architecture, and that you can't configure this driver
123 * without specifiing ARM mode, this is not a problem.
124 *
125 * This routine is essentially an optimised memcpy from the card's
126 * onboard RAM to kernel memory.
127 */
128 static void
129 ether1_writebuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
130 {
131 unsigned int page, thislen, offset;
132 void __iomem *addr;
133
134 offset = start & 4095;
135 page = start >> 12;
136 addr = ETHER1_RAM + (offset << 1);
137
138 if (offset + length > 4096)
139 thislen = 4096 - offset;
140 else
141 thislen = length;
142
143 do {
144 int used;
145
146 writeb(page, REG_PAGE);
147 length -= thislen;
148
149 __asm__ __volatile__(
150 "subs %3, %3, #2\n\
151 bmi 2f\n\
152 1: ldr %0, [%1], #2\n\
153 mov %0, %0, lsl #16\n\
154 orr %0, %0, %0, lsr #16\n\
155 str %0, [%2], #4\n\
156 subs %3, %3, #2\n\
157 bmi 2f\n\
158 ldr %0, [%1], #2\n\
159 mov %0, %0, lsl #16\n\
160 orr %0, %0, %0, lsr #16\n\
161 str %0, [%2], #4\n\
162 subs %3, %3, #2\n\
163 bmi 2f\n\
164 ldr %0, [%1], #2\n\
165 mov %0, %0, lsl #16\n\
166 orr %0, %0, %0, lsr #16\n\
167 str %0, [%2], #4\n\
168 subs %3, %3, #2\n\
169 bmi 2f\n\
170 ldr %0, [%1], #2\n\
171 mov %0, %0, lsl #16\n\
172 orr %0, %0, %0, lsr #16\n\
173 str %0, [%2], #4\n\
174 subs %3, %3, #2\n\
175 bpl 1b\n\
176 2: adds %3, %3, #1\n\
177 ldreqb %0, [%1]\n\
178 streqb %0, [%2]"
179 : "=&r" (used), "=&r" (data)
180 : "r" (addr), "r" (thislen), "1" (data));
181
182 addr = ETHER1_RAM;
183
184 thislen = length;
185 if (thislen > 4096)
186 thislen = 4096;
187 page++;
188 } while (thislen);
189 }
190
191 static void
192 ether1_readbuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length)
193 {
194 unsigned int page, thislen, offset;
195 void __iomem *addr;
196
197 offset = start & 4095;
198 page = start >> 12;
199 addr = ETHER1_RAM + (offset << 1);
200
201 if (offset + length > 4096)
202 thislen = 4096 - offset;
203 else
204 thislen = length;
205
206 do {
207 int used;
208
209 writeb(page, REG_PAGE);
210 length -= thislen;
211
212 __asm__ __volatile__(
213 "subs %3, %3, #2\n\
214 bmi 2f\n\
215 1: ldr %0, [%2], #4\n\
216 strb %0, [%1], #1\n\
217 mov %0, %0, lsr #8\n\
218 strb %0, [%1], #1\n\
219 subs %3, %3, #2\n\
220 bmi 2f\n\
221 ldr %0, [%2], #4\n\
222 strb %0, [%1], #1\n\
223 mov %0, %0, lsr #8\n\
224 strb %0, [%1], #1\n\
225 subs %3, %3, #2\n\
226 bmi 2f\n\
227 ldr %0, [%2], #4\n\
228 strb %0, [%1], #1\n\
229 mov %0, %0, lsr #8\n\
230 strb %0, [%1], #1\n\
231 subs %3, %3, #2\n\
232 bmi 2f\n\
233 ldr %0, [%2], #4\n\
234 strb %0, [%1], #1\n\
235 mov %0, %0, lsr #8\n\
236 strb %0, [%1], #1\n\
237 subs %3, %3, #2\n\
238 bpl 1b\n\
239 2: adds %3, %3, #1\n\
240 ldreqb %0, [%2]\n\
241 streqb %0, [%1]"
242 : "=&r" (used), "=&r" (data)
243 : "r" (addr), "r" (thislen), "1" (data));
244
245 addr = ETHER1_RAM;
246
247 thislen = length;
248 if (thislen > 4096)
249 thislen = 4096;
250 page++;
251 } while (thislen);
252 }
253
254 static int __devinit
255 ether1_ramtest(struct net_device *dev, unsigned char byte)
256 {
257 unsigned char *buffer = kmalloc (BUFFER_SIZE, GFP_KERNEL);
258 int i, ret = BUFFER_SIZE;
259 int max_errors = 15;
260 int bad = -1;
261 int bad_start = 0;
262
263 if (!buffer)
264 return 1;
265
266 memset (buffer, byte, BUFFER_SIZE);
267 ether1_writebuffer (dev, buffer, 0, BUFFER_SIZE);
268 memset (buffer, byte ^ 0xff, BUFFER_SIZE);
269 ether1_readbuffer (dev, buffer, 0, BUFFER_SIZE);
270
271 for (i = 0; i < BUFFER_SIZE; i++) {
272 if (buffer[i] != byte) {
273 if (max_errors >= 0 && bad != buffer[i]) {
274 if (bad != -1)
275 printk ("\n");
276 printk (KERN_CRIT "%s: RAM failed with (%02X instead of %02X) at 0x%04X",
277 dev->name, buffer[i], byte, i);
278 ret = -ENODEV;
279 max_errors --;
280 bad = buffer[i];
281 bad_start = i;
282 }
283 } else {
284 if (bad != -1) {
285 if (bad_start == i - 1)
286 printk ("\n");
287 else
288 printk (" - 0x%04X\n", i - 1);
289 bad = -1;
290 }
291 }
292 }
293
294 if (bad != -1)
295 printk (" - 0x%04X\n", BUFFER_SIZE);
296 kfree (buffer);
297
298 return ret;
299 }
300
301 static int
302 ether1_reset (struct net_device *dev)
303 {
304 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
305 return BUS_16;
306 }
307
308 static int __devinit
309 ether1_init_2(struct net_device *dev)
310 {
311 int i;
312 dev->mem_start = 0;
313
314 i = ether1_ramtest (dev, 0x5a);
315
316 if (i > 0)
317 i = ether1_ramtest (dev, 0x1e);
318
319 if (i <= 0)
320 return -ENODEV;
321
322 dev->mem_end = i;
323 return 0;
324 }
325
326 /*
327 * These are the structures that are loaded into the ether RAM card to
328 * initialise the 82586
329 */
330
331 /* at 0x0100 */
332 #define NOP_ADDR (TX_AREA_START)
333 #define NOP_SIZE (0x06)
334 static nop_t init_nop = {
335 0,
336 CMD_NOP,
337 NOP_ADDR
338 };
339
340 /* at 0x003a */
341 #define TDR_ADDR (0x003a)
342 #define TDR_SIZE (0x08)
343 static tdr_t init_tdr = {
344 0,
345 CMD_TDR | CMD_INTR,
346 NOP_ADDR,
347 0
348 };
349
350 /* at 0x002e */
351 #define MC_ADDR (0x002e)
352 #define MC_SIZE (0x0c)
353 static mc_t init_mc = {
354 0,
355 CMD_SETMULTICAST,
356 TDR_ADDR,
357 0,
358 { { 0, } }
359 };
360
361 /* at 0x0022 */
362 #define SA_ADDR (0x0022)
363 #define SA_SIZE (0x0c)
364 static sa_t init_sa = {
365 0,
366 CMD_SETADDRESS,
367 MC_ADDR,
368 { 0, }
369 };
370
371 /* at 0x0010 */
372 #define CFG_ADDR (0x0010)
373 #define CFG_SIZE (0x12)
374 static cfg_t init_cfg = {
375 0,
376 CMD_CONFIG,
377 SA_ADDR,
378 8,
379 8,
380 CFG8_SRDY,
381 CFG9_PREAMB8 | CFG9_ADDRLENBUF | CFG9_ADDRLEN(6),
382 0,
383 0x60,
384 0,
385 CFG13_RETRY(15) | CFG13_SLOTH(2),
386 0,
387 };
388
389 /* at 0x0000 */
390 #define SCB_ADDR (0x0000)
391 #define SCB_SIZE (0x10)
392 static scb_t init_scb = {
393 0,
394 SCB_CMDACKRNR | SCB_CMDACKCNA | SCB_CMDACKFR | SCB_CMDACKCX,
395 CFG_ADDR,
396 RX_AREA_START,
397 0,
398 0,
399 0,
400 0
401 };
402
403 /* at 0xffee */
404 #define ISCP_ADDR (0xffee)
405 #define ISCP_SIZE (0x08)
406 static iscp_t init_iscp = {
407 1,
408 SCB_ADDR,
409 0x0000,
410 0x0000
411 };
412
413 /* at 0xfff6 */
414 #define SCP_ADDR (0xfff6)
415 #define SCP_SIZE (0x0a)
416 static scp_t init_scp = {
417 SCP_SY_16BBUS,
418 { 0, 0 },
419 ISCP_ADDR,
420 0
421 };
422
423 #define RFD_SIZE (0x16)
424 static rfd_t init_rfd = {
425 0,
426 0,
427 0,
428 0,
429 { 0, },
430 { 0, },
431 0
432 };
433
434 #define RBD_SIZE (0x0a)
435 static rbd_t init_rbd = {
436 0,
437 0,
438 0,
439 0,
440 ETH_FRAME_LEN + 8
441 };
442
443 #define TX_SIZE (0x08)
444 #define TBD_SIZE (0x08)
445
446 static int
447 ether1_init_for_open (struct net_device *dev)
448 {
449 int i, status, addr, next, next2;
450 int failures = 0;
451 unsigned long timeout;
452
453 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
454
455 for (i = 0; i < 6; i++)
456 init_sa.sa_addr[i] = dev->dev_addr[i];
457
458 /* load data structures into ether1 RAM */
459 ether1_writebuffer (dev, &init_scp, SCP_ADDR, SCP_SIZE);
460 ether1_writebuffer (dev, &init_iscp, ISCP_ADDR, ISCP_SIZE);
461 ether1_writebuffer (dev, &init_scb, SCB_ADDR, SCB_SIZE);
462 ether1_writebuffer (dev, &init_cfg, CFG_ADDR, CFG_SIZE);
463 ether1_writebuffer (dev, &init_sa, SA_ADDR, SA_SIZE);
464 ether1_writebuffer (dev, &init_mc, MC_ADDR, MC_SIZE);
465 ether1_writebuffer (dev, &init_tdr, TDR_ADDR, TDR_SIZE);
466 ether1_writebuffer (dev, &init_nop, NOP_ADDR, NOP_SIZE);
467
468 if (ether1_readw(dev, CFG_ADDR, cfg_t, cfg_command, NORMALIRQS) != CMD_CONFIG) {
469 printk (KERN_ERR "%s: detected either RAM fault or compiler bug\n",
470 dev->name);
471 return 1;
472 }
473
474 /*
475 * setup circularly linked list of { rfd, rbd, buffer }, with
476 * all rfds circularly linked, rbds circularly linked.
477 * First rfd is linked to scp, first rbd is linked to first
478 * rfd. Last rbd has a suspend command.
479 */
480 addr = RX_AREA_START;
481 do {
482 next = addr + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
483 next2 = next + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10;
484
485 if (next2 >= RX_AREA_END) {
486 next = RX_AREA_START;
487 init_rfd.rfd_command = RFD_CMDEL | RFD_CMDSUSPEND;
488 priv(dev)->rx_tail = addr;
489 } else
490 init_rfd.rfd_command = 0;
491 if (addr == RX_AREA_START)
492 init_rfd.rfd_rbdoffset = addr + RFD_SIZE;
493 else
494 init_rfd.rfd_rbdoffset = 0;
495 init_rfd.rfd_link = next;
496 init_rbd.rbd_link = next + RFD_SIZE;
497 init_rbd.rbd_bufl = addr + RFD_SIZE + RBD_SIZE;
498
499 ether1_writebuffer (dev, &init_rfd, addr, RFD_SIZE);
500 ether1_writebuffer (dev, &init_rbd, addr + RFD_SIZE, RBD_SIZE);
501 addr = next;
502 } while (next2 < RX_AREA_END);
503
504 priv(dev)->tx_link = NOP_ADDR;
505 priv(dev)->tx_head = NOP_ADDR + NOP_SIZE;
506 priv(dev)->tx_tail = TDR_ADDR;
507 priv(dev)->rx_head = RX_AREA_START;
508
509 /* release reset & give 586 a prod */
510 priv(dev)->resetting = 1;
511 priv(dev)->initialising = 1;
512 writeb(CTRL_RST, REG_CONTROL);
513 writeb(0, REG_CONTROL);
514 writeb(CTRL_CA, REG_CONTROL);
515
516 /* 586 should now unset iscp.busy */
517 timeout = jiffies + HZ/2;
518 while (ether1_readw(dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) {
519 if (time_after(jiffies, timeout)) {
520 printk (KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name);
521 return 1;
522 }
523 }
524
525 /* check status of commands that we issued */
526 timeout += HZ/10;
527 while (((status = ether1_readw(dev, CFG_ADDR, cfg_t, cfg_status, DISABLEIRQS))
528 & STAT_COMPLETE) == 0) {
529 if (time_after(jiffies, timeout))
530 break;
531 }
532
533 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
534 printk (KERN_WARNING "%s: can't initialise 82586: config status %04X\n", dev->name, status);
535 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
536 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
537 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
538 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
539 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
540 failures += 1;
541 }
542
543 timeout += HZ/10;
544 while (((status = ether1_readw(dev, SA_ADDR, sa_t, sa_status, DISABLEIRQS))
545 & STAT_COMPLETE) == 0) {
546 if (time_after(jiffies, timeout))
547 break;
548 }
549
550 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
551 printk (KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status);
552 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
553 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
554 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
555 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
556 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
557 failures += 1;
558 }
559
560 timeout += HZ/10;
561 while (((status = ether1_readw(dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS))
562 & STAT_COMPLETE) == 0) {
563 if (time_after(jiffies, timeout))
564 break;
565 }
566
567 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
568 printk (KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status);
569 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
570 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
571 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
572 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
573 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
574 failures += 1;
575 }
576
577 timeout += HZ;
578 while (((status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS))
579 & STAT_COMPLETE) == 0) {
580 if (time_after(jiffies, timeout))
581 break;
582 }
583
584 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) {
585 printk (KERN_WARNING "%s: can't tdr (ignored)\n", dev->name);
586 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name,
587 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS),
588 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS),
589 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS),
590 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS));
591 } else {
592 status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS);
593 if (status & TDR_XCVRPROB)
594 printk (KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name);
595 else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) {
596 #ifdef FANCY
597 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name,
598 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10,
599 (status & TDR_TIME) % 10);
600 #else
601 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d clks away\n", dev->name,
602 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME));
603 #endif
604 }
605 }
606
607 if (failures)
608 ether1_reset (dev);
609 return failures ? 1 : 0;
610 }
611
612 /* ------------------------------------------------------------------------- */
613
614 static int
615 ether1_txalloc (struct net_device *dev, int size)
616 {
617 int start, tail;
618
619 size = (size + 1) & ~1;
620 tail = priv(dev)->tx_tail;
621
622 if (priv(dev)->tx_head + size > TX_AREA_END) {
623 if (tail > priv(dev)->tx_head)
624 return -1;
625 start = TX_AREA_START;
626 if (start + size > tail)
627 return -1;
628 priv(dev)->tx_head = start + size;
629 } else {
630 if (priv(dev)->tx_head < tail && (priv(dev)->tx_head + size) > tail)
631 return -1;
632 start = priv(dev)->tx_head;
633 priv(dev)->tx_head += size;
634 }
635
636 return start;
637 }
638
639 static int
640 ether1_open (struct net_device *dev)
641 {
642 if (!is_valid_ether_addr(dev->dev_addr)) {
643 printk(KERN_WARNING "%s: invalid ethernet MAC address\n",
644 dev->name);
645 return -EINVAL;
646 }
647
648 if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev))
649 return -EAGAIN;
650
651 if (ether1_init_for_open (dev)) {
652 free_irq (dev->irq, dev);
653 return -EAGAIN;
654 }
655
656 netif_start_queue(dev);
657
658 return 0;
659 }
660
661 static void
662 ether1_timeout(struct net_device *dev)
663 {
664 printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n",
665 dev->name);
666 printk(KERN_WARNING "%s: resetting device\n", dev->name);
667
668 ether1_reset (dev);
669
670 if (ether1_init_for_open (dev))
671 printk (KERN_ERR "%s: unable to restart interface\n", dev->name);
672
673 dev->stats.tx_errors++;
674 netif_wake_queue(dev);
675 }
676
677 static int
678 ether1_sendpacket (struct sk_buff *skb, struct net_device *dev)
679 {
680 int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr;
681 unsigned long flags;
682 tx_t tx;
683 tbd_t tbd;
684 nop_t nop;
685
686 if (priv(dev)->restart) {
687 printk(KERN_WARNING "%s: resetting device\n", dev->name);
688
689 ether1_reset(dev);
690
691 if (ether1_init_for_open(dev))
692 printk(KERN_ERR "%s: unable to restart interface\n", dev->name);
693 else
694 priv(dev)->restart = 0;
695 }
696
697 if (skb->len < ETH_ZLEN) {
698 if (skb_padto(skb, ETH_ZLEN))
699 goto out;
700 }
701
702 /*
703 * insert packet followed by a nop
704 */
705 txaddr = ether1_txalloc (dev, TX_SIZE);
706 tbdaddr = ether1_txalloc (dev, TBD_SIZE);
707 dataddr = ether1_txalloc (dev, skb->len);
708 nopaddr = ether1_txalloc (dev, NOP_SIZE);
709
710 tx.tx_status = 0;
711 tx.tx_command = CMD_TX | CMD_INTR;
712 tx.tx_link = nopaddr;
713 tx.tx_tbdoffset = tbdaddr;
714 tbd.tbd_opts = TBD_EOL | skb->len;
715 tbd.tbd_link = I82586_NULL;
716 tbd.tbd_bufl = dataddr;
717 tbd.tbd_bufh = 0;
718 nop.nop_status = 0;
719 nop.nop_command = CMD_NOP;
720 nop.nop_link = nopaddr;
721
722 local_irq_save(flags);
723 ether1_writebuffer (dev, &tx, txaddr, TX_SIZE);
724 ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE);
725 ether1_writebuffer (dev, skb->data, dataddr, skb->len);
726 ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE);
727 tmp = priv(dev)->tx_link;
728 priv(dev)->tx_link = nopaddr;
729
730 /* now reset the previous nop pointer */
731 ether1_writew(dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS);
732
733 local_irq_restore(flags);
734
735 /* handle transmit */
736
737 /* check to see if we have room for a full sized ether frame */
738 tmp = priv(dev)->tx_head;
739 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
740 priv(dev)->tx_head = tmp;
741 dev_kfree_skb (skb);
742
743 if (tst == -1)
744 netif_stop_queue(dev);
745
746 out:
747 return NETDEV_TX_OK;
748 }
749
750 static void
751 ether1_xmit_done (struct net_device *dev)
752 {
753 nop_t nop;
754 int caddr, tst;
755
756 caddr = priv(dev)->tx_tail;
757
758 again:
759 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
760
761 switch (nop.nop_command & CMD_MASK) {
762 case CMD_TDR:
763 /* special case */
764 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
765 != (unsigned short)I82586_NULL) {
766 ether1_writew(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t,
767 scb_command, NORMALIRQS);
768 writeb(CTRL_CA, REG_CONTROL);
769 }
770 priv(dev)->tx_tail = NOP_ADDR;
771 return;
772
773 case CMD_NOP:
774 if (nop.nop_link == caddr) {
775 if (priv(dev)->initialising == 0)
776 printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name);
777 else
778 priv(dev)->initialising = 0;
779 return;
780 }
781 if (caddr == nop.nop_link)
782 return;
783 caddr = nop.nop_link;
784 goto again;
785
786 case CMD_TX:
787 if (nop.nop_status & STAT_COMPLETE)
788 break;
789 printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name);
790 priv(dev)->restart = 1;
791 return;
792
793 default:
794 printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name,
795 nop.nop_command & CMD_MASK, caddr);
796 priv(dev)->restart = 1;
797 return;
798 }
799
800 while (nop.nop_status & STAT_COMPLETE) {
801 if (nop.nop_status & STAT_OK) {
802 dev->stats.tx_packets++;
803 dev->stats.collisions += (nop.nop_status & STAT_COLLISIONS);
804 } else {
805 dev->stats.tx_errors++;
806
807 if (nop.nop_status & STAT_COLLAFTERTX)
808 dev->stats.collisions++;
809 if (nop.nop_status & STAT_NOCARRIER)
810 dev->stats.tx_carrier_errors++;
811 if (nop.nop_status & STAT_TXLOSTCTS)
812 printk (KERN_WARNING "%s: cts lost\n", dev->name);
813 if (nop.nop_status & STAT_TXSLOWDMA)
814 dev->stats.tx_fifo_errors++;
815 if (nop.nop_status & STAT_COLLEXCESSIVE)
816 dev->stats.collisions += 16;
817 }
818
819 if (nop.nop_link == caddr) {
820 printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name);
821 break;
822 }
823
824 caddr = nop.nop_link;
825 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
826 if ((nop.nop_command & CMD_MASK) != CMD_NOP) {
827 printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name);
828 break;
829 }
830
831 if (caddr == nop.nop_link)
832 break;
833
834 caddr = nop.nop_link;
835 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE);
836 if ((nop.nop_command & CMD_MASK) != CMD_TX) {
837 printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name);
838 break;
839 }
840 }
841 priv(dev)->tx_tail = caddr;
842
843 caddr = priv(dev)->tx_head;
844 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN);
845 priv(dev)->tx_head = caddr;
846 if (tst != -1)
847 netif_wake_queue(dev);
848 }
849
850 static void
851 ether1_recv_done (struct net_device *dev)
852 {
853 int status;
854 int nexttail, rbdaddr;
855 rbd_t rbd;
856
857 do {
858 status = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_status, NORMALIRQS);
859 if ((status & RFD_COMPLETE) == 0)
860 break;
861
862 rbdaddr = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS);
863 ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE);
864
865 if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) {
866 int length = rbd.rbd_status & RBD_ACNT;
867 struct sk_buff *skb;
868
869 length = (length + 1) & ~1;
870 skb = dev_alloc_skb (length + 2);
871
872 if (skb) {
873 skb_reserve (skb, 2);
874
875 ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length);
876
877 skb->protocol = eth_type_trans (skb, dev);
878 netif_rx (skb);
879 dev->stats.rx_packets++;
880 } else
881 dev->stats.rx_dropped++;
882 } else {
883 printk(KERN_WARNING "%s: %s\n", dev->name,
884 (rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid");
885 dev->stats.rx_dropped++;
886 }
887
888 nexttail = ether1_readw(dev, priv(dev)->rx_tail, rfd_t, rfd_link, NORMALIRQS);
889 /* nexttail should be rx_head */
890 if (nexttail != priv(dev)->rx_head)
891 printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n",
892 dev->name, nexttail, priv(dev)->rx_head);
893 ether1_writew(dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS);
894 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_command, NORMALIRQS);
895 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_status, NORMALIRQS);
896 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS);
897
898 priv(dev)->rx_tail = nexttail;
899 priv(dev)->rx_head = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_link, NORMALIRQS);
900 } while (1);
901 }
902
903 static irqreturn_t
904 ether1_interrupt (int irq, void *dev_id)
905 {
906 struct net_device *dev = (struct net_device *)dev_id;
907 int status;
908
909 status = ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS);
910
911 if (status) {
912 ether1_writew(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX),
913 SCB_ADDR, scb_t, scb_command, NORMALIRQS);
914 writeb(CTRL_CA | CTRL_ACK, REG_CONTROL);
915 if (status & SCB_STCX) {
916 ether1_xmit_done (dev);
917 }
918 if (status & SCB_STCNA) {
919 if (priv(dev)->resetting == 0)
920 printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name);
921 else
922 priv(dev)->resetting += 1;
923 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS)
924 != (unsigned short)I82586_NULL) {
925 ether1_writew(dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
926 writeb(CTRL_CA, REG_CONTROL);
927 }
928 if (priv(dev)->resetting == 2)
929 priv(dev)->resetting = 0;
930 }
931 if (status & SCB_STFR) {
932 ether1_recv_done (dev);
933 }
934 if (status & SCB_STRNR) {
935 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) {
936 printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name);
937 ether1_writew(dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS);
938 writeb(CTRL_CA, REG_CONTROL);
939 dev->stats.rx_dropped++; /* we suspended due to lack of buffer space */
940 } else
941 printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name,
942 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS));
943 printk (KERN_WARNING "RU ptr = %04X\n", ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset,
944 NORMALIRQS));
945 }
946 } else
947 writeb(CTRL_ACK, REG_CONTROL);
948
949 return IRQ_HANDLED;
950 }
951
952 static int
953 ether1_close (struct net_device *dev)
954 {
955 ether1_reset (dev);
956
957 free_irq(dev->irq, dev);
958
959 return 0;
960 }
961
962 /*
963 * Set or clear the multicast filter for this adaptor.
964 * num_addrs == -1 Promiscuous mode, receive all packets.
965 * num_addrs == 0 Normal mode, clear multicast list.
966 * num_addrs > 0 Multicast mode, receive normal and MC packets, and do
967 * best-effort filtering.
968 */
969 static void
970 ether1_setmulticastlist (struct net_device *dev)
971 {
972 }
973
974 /* ------------------------------------------------------------------------- */
975
976 static void __devinit ether1_banner(void)
977 {
978 static unsigned int version_printed = 0;
979
980 if (net_debug && version_printed++ == 0)
981 printk(KERN_INFO "%s", version);
982 }
983
984 static const struct net_device_ops ether1_netdev_ops = {
985 .ndo_open = ether1_open,
986 .ndo_stop = ether1_close,
987 .ndo_start_xmit = ether1_sendpacket,
988 .ndo_set_rx_mode = ether1_setmulticastlist,
989 .ndo_tx_timeout = ether1_timeout,
990 .ndo_validate_addr = eth_validate_addr,
991 .ndo_change_mtu = eth_change_mtu,
992 .ndo_set_mac_address = eth_mac_addr,
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_NETDEV_DEV(dev, &ec->dev);
1014
1015 dev->irq = ec->irq;
1016 priv(dev)->base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
1017 if (!priv(dev)->base) {
1018 ret = -ENOMEM;
1019 goto free;
1020 }
1021
1022 if ((priv(dev)->bus_type = ether1_reset(dev)) == 0) {
1023 ret = -ENODEV;
1024 goto free;
1025 }
1026
1027 for (i = 0; i < 6; i++)
1028 dev->dev_addr[i] = readb(IDPROM_ADDRESS + (i << 2));
1029
1030 if (ether1_init_2(dev)) {
1031 ret = -ENODEV;
1032 goto free;
1033 }
1034
1035 dev->netdev_ops = &ether1_netdev_ops;
1036 dev->watchdog_timeo = 5 * HZ / 100;
1037
1038 ret = register_netdev(dev);
1039 if (ret)
1040 goto free;
1041
1042 printk(KERN_INFO "%s: ether1 in slot %d, %pM\n",
1043 dev->name, ec->slot_no, dev->dev_addr);
1044
1045 ecard_set_drvdata(ec, dev);
1046 return 0;
1047
1048 free:
1049 free_netdev(dev);
1050 release:
1051 ecard_release_resources(ec);
1052 out:
1053 return ret;
1054 }
1055
1056 static void __devexit ether1_remove(struct expansion_card *ec)
1057 {
1058 struct net_device *dev = ecard_get_drvdata(ec);
1059
1060 ecard_set_drvdata(ec, NULL);
1061
1062 unregister_netdev(dev);
1063 free_netdev(dev);
1064 ecard_release_resources(ec);
1065 }
1066
1067 static const struct ecard_id ether1_ids[] = {
1068 { MANU_ACORN, PROD_ACORN_ETHER1 },
1069 { 0xffff, 0xffff }
1070 };
1071
1072 static struct ecard_driver ether1_driver = {
1073 .probe = ether1_probe,
1074 .remove = __devexit_p(ether1_remove),
1075 .id_table = ether1_ids,
1076 .drv = {
1077 .name = "ether1",
1078 },
1079 };
1080
1081 static int __init ether1_init(void)
1082 {
1083 return ecard_register_driver(&ether1_driver);
1084 }
1085
1086 static void __exit ether1_exit(void)
1087 {
1088 ecard_remove_driver(&ether1_driver);
1089 }
1090
1091 module_init(ether1_init);
1092 module_exit(ether1_exit);
1093
1094 MODULE_LICENSE("GPL");