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ether1.c
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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 
58 static 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 
66 static int ether1_open(struct net_device *dev);
67 static int ether1_sendpacket(struct sk_buff *skb, struct net_device *dev);
68 static irqreturn_t ether1_interrupt(int irq, void *dev_id);
69 static int ether1_close(struct net_device *dev);
70 static void ether1_setmulticastlist(struct net_device *dev);
71 static void ether1_timeout(struct net_device *dev);
72 
73 /* ------------------------------------------------------------------------- */
74 
75 static 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 
88 static inline unsigned short
89 ether1_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 
104 static inline void
105 ether1_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  */
127 static void
128 ether1_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\
151 1: 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\
175 2: 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 
190 static void
191 ether1_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\
214 1: 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\
238 2: 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 
253 static int __devinit
254 ether1_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 
300 static int
301 ether1_reset (struct net_device *dev)
302 {
303  writeb(CTRL_RST|CTRL_ACK, REG_CONTROL);
304  return BUS_16;
305 }
306 
307 static int __devinit
308 ether1_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)
333 static 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)
342 static 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)
352 static 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)
363 static 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)
373 static 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)
391 static 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)
405 static 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)
415 static scp_t init_scp = {
416  SCP_SY_16BBUS,
417  { 0, 0 },
418  ISCP_ADDR,
419  0
420 };
421 
422 #define RFD_SIZE (0x16)
423 static 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)
434 static 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 
445 static int
446 ether1_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 
613 static int
614 ether1_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 
638 static int
639 ether1_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 
660 static void
661 ether1_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 
676 static int
677 ether1_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 
749 static void
750 ether1_xmit_done (struct net_device *dev)
751 {
752  nop_t nop;
753  int caddr, tst;
754 
755  caddr = priv(dev)->tx_tail;
756 
757 again:
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 
849 static void
850 ether1_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 
902 static irqreturn_t
903 ether1_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 
951 static int
952 ether1_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  */
968 static void
969 ether1_setmulticastlist (struct net_device *dev)
970 {
971 }
972 
973 /* ------------------------------------------------------------------------- */
974 
975 static 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 
983 static 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 
994 static int __devinit
995 ether1_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 = &ether1_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 
1055 static 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 
1066 static const struct ecard_id ether1_ids[] = {
1067  { MANU_ACORN, PROD_ACORN_ETHER1 },
1068  { 0xffff, 0xffff }
1069 };
1070 
1071 static 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 
1080 static int __init ether1_init(void)
1081 {
1082  return ecard_register_driver(&ether1_driver);
1083 }
1084 
1085 static void __exit ether1_exit(void)
1086 {
1087  ecard_remove_driver(&ether1_driver);
1088 }
1089 
1090 module_init(ether1_init);
1091 module_exit(ether1_exit);
1092 
1093 MODULE_LICENSE("GPL");
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