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am79c961a.c
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1 /*
2  * linux/drivers/net/ethernet/amd/am79c961a.c
3  *
4  * by Russell King <[email protected]> 1995-2001.
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  * Derived from various things including skeleton.c
11  *
12  * This is a special driver for the am79c961A Lance chip used in the
13  * Intel (formally Digital Equipment Corp) EBSA110 platform. Please
14  * note that this can not be built as a module (it doesn't make sense).
15  */
16 #include <linux/kernel.h>
17 #include <linux/types.h>
18 #include <linux/interrupt.h>
19 #include <linux/ioport.h>
20 #include <linux/slab.h>
21 #include <linux/string.h>
22 #include <linux/errno.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/delay.h>
26 #include <linux/init.h>
27 #include <linux/crc32.h>
28 #include <linux/bitops.h>
29 #include <linux/platform_device.h>
30 #include <linux/io.h>
31 
32 #include <mach/hardware.h>
33 
34 #define TX_BUFFERS 15
35 #define RX_BUFFERS 25
36 
37 #include "am79c961a.h"
38 
39 static irqreturn_t
40 am79c961_interrupt (int irq, void *dev_id);
41 
42 static unsigned int net_debug = NET_DEBUG;
43 
44 static const char version[] =
45  "am79c961 ethernet driver (C) 1995-2001 Russell King v0.04\n";
46 
47 /* --------------------------------------------------------------------------- */
48 
49 #ifdef __arm__
50 static void write_rreg(u_long base, u_int reg, u_int val)
51 {
52  asm volatile(
53  "str%?h %1, [%2] @ NET_RAP\n\t"
54  "str%?h %0, [%2, #-4] @ NET_RDP"
55  :
56  : "r" (val), "r" (reg), "r" (ISAIO_BASE + 0x0464));
57 }
58 
59 static inline unsigned short read_rreg(u_long base_addr, u_int reg)
60 {
61  unsigned short v;
62  asm volatile(
63  "str%?h %1, [%2] @ NET_RAP\n\t"
64  "ldr%?h %0, [%2, #-4] @ NET_RDP"
65  : "=r" (v)
66  : "r" (reg), "r" (ISAIO_BASE + 0x0464));
67  return v;
68 }
69 
70 static inline void write_ireg(u_long base, u_int reg, u_int val)
71 {
72  asm volatile(
73  "str%?h %1, [%2] @ NET_RAP\n\t"
74  "str%?h %0, [%2, #8] @ NET_IDP"
75  :
76  : "r" (val), "r" (reg), "r" (ISAIO_BASE + 0x0464));
77 }
78 
79 static inline unsigned short read_ireg(u_long base_addr, u_int reg)
80 {
81  u_short v;
82  asm volatile(
83  "str%?h %1, [%2] @ NAT_RAP\n\t"
84  "ldr%?h %0, [%2, #8] @ NET_IDP\n\t"
85  : "=r" (v)
86  : "r" (reg), "r" (ISAIO_BASE + 0x0464));
87  return v;
88 }
89 
90 #define am_writeword(dev,off,val) __raw_writew(val, ISAMEM_BASE + ((off) << 1))
91 #define am_readword(dev,off) __raw_readw(ISAMEM_BASE + ((off) << 1))
92 
93 static void
94 am_writebuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
95 {
96  offset = ISAMEM_BASE + (offset << 1);
97  length = (length + 1) & ~1;
98  if ((int)buf & 2) {
99  asm volatile("str%?h %2, [%0], #4"
100  : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
101  buf += 2;
102  length -= 2;
103  }
104  while (length > 8) {
105  register unsigned int tmp asm("r2"), tmp2 asm("r3");
106  asm volatile(
107  "ldm%?ia %0!, {%1, %2}"
108  : "+r" (buf), "=&r" (tmp), "=&r" (tmp2));
109  length -= 8;
110  asm volatile(
111  "str%?h %1, [%0], #4\n\t"
112  "mov%? %1, %1, lsr #16\n\t"
113  "str%?h %1, [%0], #4\n\t"
114  "str%?h %2, [%0], #4\n\t"
115  "mov%? %2, %2, lsr #16\n\t"
116  "str%?h %2, [%0], #4"
117  : "+r" (offset), "=&r" (tmp), "=&r" (tmp2));
118  }
119  while (length > 0) {
120  asm volatile("str%?h %2, [%0], #4"
121  : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8)));
122  buf += 2;
123  length -= 2;
124  }
125 }
126 
127 static void
128 am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length)
129 {
130  offset = ISAMEM_BASE + (offset << 1);
131  length = (length + 1) & ~1;
132  if ((int)buf & 2) {
133  unsigned int tmp;
134  asm volatile(
135  "ldr%?h %2, [%0], #4\n\t"
136  "str%?b %2, [%1], #1\n\t"
137  "mov%? %2, %2, lsr #8\n\t"
138  "str%?b %2, [%1], #1"
139  : "=&r" (offset), "=&r" (buf), "=r" (tmp): "0" (offset), "1" (buf));
140  length -= 2;
141  }
142  while (length > 8) {
143  register unsigned int tmp asm("r2"), tmp2 asm("r3"), tmp3;
144  asm volatile(
145  "ldr%?h %2, [%0], #4\n\t"
146  "ldr%?h %4, [%0], #4\n\t"
147  "ldr%?h %3, [%0], #4\n\t"
148  "orr%? %2, %2, %4, lsl #16\n\t"
149  "ldr%?h %4, [%0], #4\n\t"
150  "orr%? %3, %3, %4, lsl #16\n\t"
151  "stm%?ia %1!, {%2, %3}"
152  : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2), "=r" (tmp3)
153  : "0" (offset), "1" (buf));
154  length -= 8;
155  }
156  while (length > 0) {
157  unsigned int tmp;
158  asm volatile(
159  "ldr%?h %2, [%0], #4\n\t"
160  "str%?b %2, [%1], #1\n\t"
161  "mov%? %2, %2, lsr #8\n\t"
162  "str%?b %2, [%1], #1"
163  : "=&r" (offset), "=&r" (buf), "=r" (tmp) : "0" (offset), "1" (buf));
164  length -= 2;
165  }
166 }
167 #else
168 #error Not compatible
169 #endif
170 
171 static int
172 am79c961_ramtest(struct net_device *dev, unsigned int val)
173 {
174  unsigned char *buffer = kmalloc (65536, GFP_KERNEL);
175  int i, error = 0, errorcount = 0;
176 
177  if (!buffer)
178  return 0;
179  memset (buffer, val, 65536);
180  am_writebuffer(dev, 0, buffer, 65536);
181  memset (buffer, val ^ 255, 65536);
182  am_readbuffer(dev, 0, buffer, 65536);
183  for (i = 0; i < 65536; i++) {
184  if (buffer[i] != val && !error) {
185  printk ("%s: buffer error (%02X %02X) %05X - ", dev->name, val, buffer[i], i);
186  error = 1;
187  errorcount ++;
188  } else if (error && buffer[i] == val) {
189  printk ("%05X\n", i);
190  error = 0;
191  }
192  }
193  if (error)
194  printk ("10000\n");
195  kfree (buffer);
196  return errorcount;
197 }
198 
199 static void am79c961_mc_hash(char *addr, u16 *hash)
200 {
201  int idx, bit;
202  u32 crc;
203 
204  crc = ether_crc_le(ETH_ALEN, addr);
205 
206  idx = crc >> 30;
207  bit = (crc >> 26) & 15;
208 
209  hash[idx] |= 1 << bit;
210 }
211 
212 static unsigned int am79c961_get_rx_mode(struct net_device *dev, u16 *hash)
213 {
214  unsigned int mode = MODE_PORT_10BT;
215 
216  if (dev->flags & IFF_PROMISC) {
217  mode |= MODE_PROMISC;
218  memset(hash, 0xff, 4 * sizeof(*hash));
219  } else if (dev->flags & IFF_ALLMULTI) {
220  memset(hash, 0xff, 4 * sizeof(*hash));
221  } else {
222  struct netdev_hw_addr *ha;
223 
224  memset(hash, 0, 4 * sizeof(*hash));
225 
226  netdev_for_each_mc_addr(ha, dev)
227  am79c961_mc_hash(ha->addr, hash);
228  }
229 
230  return mode;
231 }
232 
233 static void
234 am79c961_init_for_open(struct net_device *dev)
235 {
236  struct dev_priv *priv = netdev_priv(dev);
237  unsigned long flags;
238  unsigned char *p;
239  u_int hdr_addr, first_free_addr;
240  u16 multi_hash[4], mode = am79c961_get_rx_mode(dev, multi_hash);
241  int i;
242 
243  /*
244  * Stop the chip.
245  */
246  spin_lock_irqsave(&priv->chip_lock, flags);
247  write_rreg (dev->base_addr, CSR0, CSR0_BABL|CSR0_CERR|CSR0_MISS|CSR0_MERR|CSR0_TINT|CSR0_RINT|CSR0_STOP);
248  spin_unlock_irqrestore(&priv->chip_lock, flags);
249 
250  write_ireg (dev->base_addr, 5, 0x00a0); /* Receive address LED */
251  write_ireg (dev->base_addr, 6, 0x0081); /* Collision LED */
252  write_ireg (dev->base_addr, 7, 0x0090); /* XMIT LED */
253  write_ireg (dev->base_addr, 2, 0x0000); /* MODE register selects media */
254 
255  for (i = LADRL; i <= LADRH; i++)
256  write_rreg (dev->base_addr, i, multi_hash[i - LADRL]);
257 
258  for (i = PADRL, p = dev->dev_addr; i <= PADRH; i++, p += 2)
259  write_rreg (dev->base_addr, i, p[0] | (p[1] << 8));
260 
261  write_rreg (dev->base_addr, MODE, mode);
262  write_rreg (dev->base_addr, POLLINT, 0);
263  write_rreg (dev->base_addr, SIZERXR, -RX_BUFFERS);
264  write_rreg (dev->base_addr, SIZETXR, -TX_BUFFERS);
265 
266  first_free_addr = RX_BUFFERS * 8 + TX_BUFFERS * 8 + 16;
267  hdr_addr = 0;
268 
269  priv->rxhead = 0;
270  priv->rxtail = 0;
271  priv->rxhdr = hdr_addr;
272 
273  for (i = 0; i < RX_BUFFERS; i++) {
274  priv->rxbuffer[i] = first_free_addr;
275  am_writeword (dev, hdr_addr, first_free_addr);
276  am_writeword (dev, hdr_addr + 2, RMD_OWN);
277  am_writeword (dev, hdr_addr + 4, (-1600));
278  am_writeword (dev, hdr_addr + 6, 0);
279  first_free_addr += 1600;
280  hdr_addr += 8;
281  }
282  priv->txhead = 0;
283  priv->txtail = 0;
284  priv->txhdr = hdr_addr;
285  for (i = 0; i < TX_BUFFERS; i++) {
286  priv->txbuffer[i] = first_free_addr;
287  am_writeword (dev, hdr_addr, first_free_addr);
288  am_writeword (dev, hdr_addr + 2, TMD_STP|TMD_ENP);
289  am_writeword (dev, hdr_addr + 4, 0xf000);
290  am_writeword (dev, hdr_addr + 6, 0);
291  first_free_addr += 1600;
292  hdr_addr += 8;
293  }
294 
295  write_rreg (dev->base_addr, BASERXL, priv->rxhdr);
296  write_rreg (dev->base_addr, BASERXH, 0);
297  write_rreg (dev->base_addr, BASETXL, priv->txhdr);
298  write_rreg (dev->base_addr, BASERXH, 0);
299  write_rreg (dev->base_addr, CSR0, CSR0_STOP);
300  write_rreg (dev->base_addr, CSR3, CSR3_IDONM|CSR3_BABLM|CSR3_DXSUFLO);
301  write_rreg (dev->base_addr, CSR4, CSR4_APAD_XMIT|CSR4_MFCOM|CSR4_RCVCCOM|CSR4_TXSTRTM|CSR4_JABM);
302  write_rreg (dev->base_addr, CSR0, CSR0_IENA|CSR0_STRT);
303 }
304 
305 static void am79c961_timer(unsigned long data)
306 {
307  struct net_device *dev = (struct net_device *)data;
308  struct dev_priv *priv = netdev_priv(dev);
309  unsigned int lnkstat, carrier;
310  unsigned long flags;
311 
312  spin_lock_irqsave(&priv->chip_lock, flags);
313  lnkstat = read_ireg(dev->base_addr, ISALED0) & ISALED0_LNKST;
314  spin_unlock_irqrestore(&priv->chip_lock, flags);
315  carrier = netif_carrier_ok(dev);
316 
317  if (lnkstat && !carrier) {
318  netif_carrier_on(dev);
319  printk("%s: link up\n", dev->name);
320  } else if (!lnkstat && carrier) {
321  netif_carrier_off(dev);
322  printk("%s: link down\n", dev->name);
323  }
324 
325  mod_timer(&priv->timer, jiffies + msecs_to_jiffies(500));
326 }
327 
328 /*
329  * Open/initialize the board.
330  */
331 static int
332 am79c961_open(struct net_device *dev)
333 {
334  struct dev_priv *priv = netdev_priv(dev);
335  int ret;
336 
337  ret = request_irq(dev->irq, am79c961_interrupt, 0, dev->name, dev);
338  if (ret)
339  return ret;
340 
341  am79c961_init_for_open(dev);
342 
343  netif_carrier_off(dev);
344 
345  priv->timer.expires = jiffies;
346  add_timer(&priv->timer);
347 
348  netif_start_queue(dev);
349 
350  return 0;
351 }
352 
353 /*
354  * The inverse routine to am79c961_open().
355  */
356 static int
357 am79c961_close(struct net_device *dev)
358 {
359  struct dev_priv *priv = netdev_priv(dev);
360  unsigned long flags;
361 
362  del_timer_sync(&priv->timer);
363 
364  netif_stop_queue(dev);
365  netif_carrier_off(dev);
366 
367  spin_lock_irqsave(&priv->chip_lock, flags);
368  write_rreg (dev->base_addr, CSR0, CSR0_STOP);
369  write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
370  spin_unlock_irqrestore(&priv->chip_lock, flags);
371 
372  free_irq (dev->irq, dev);
373 
374  return 0;
375 }
376 
377 /*
378  * Set or clear promiscuous/multicast mode filter for this adapter.
379  */
380 static void am79c961_setmulticastlist (struct net_device *dev)
381 {
382  struct dev_priv *priv = netdev_priv(dev);
383  unsigned long flags;
384  u16 multi_hash[4], mode = am79c961_get_rx_mode(dev, multi_hash);
385  int i, stopped;
386 
387  spin_lock_irqsave(&priv->chip_lock, flags);
388 
389  stopped = read_rreg(dev->base_addr, CSR0) & CSR0_STOP;
390 
391  if (!stopped) {
392  /*
393  * Put the chip into suspend mode
394  */
395  write_rreg(dev->base_addr, CTRL1, CTRL1_SPND);
396 
397  /*
398  * Spin waiting for chip to report suspend mode
399  */
400  while ((read_rreg(dev->base_addr, CTRL1) & CTRL1_SPND) == 0) {
401  spin_unlock_irqrestore(&priv->chip_lock, flags);
402  nop();
403  spin_lock_irqsave(&priv->chip_lock, flags);
404  }
405  }
406 
407  /*
408  * Update the multicast hash table
409  */
410  for (i = 0; i < ARRAY_SIZE(multi_hash); i++)
411  write_rreg(dev->base_addr, i + LADRL, multi_hash[i]);
412 
413  /*
414  * Write the mode register
415  */
416  write_rreg(dev->base_addr, MODE, mode);
417 
418  if (!stopped) {
419  /*
420  * Put the chip back into running mode
421  */
422  write_rreg(dev->base_addr, CTRL1, 0);
423  }
424 
425  spin_unlock_irqrestore(&priv->chip_lock, flags);
426 }
427 
428 static void am79c961_timeout(struct net_device *dev)
429 {
430  printk(KERN_WARNING "%s: transmit timed out, network cable problem?\n",
431  dev->name);
432 
433  /*
434  * ought to do some setup of the tx side here
435  */
436 
437  netif_wake_queue(dev);
438 }
439 
440 /*
441  * Transmit a packet
442  */
443 static int
444 am79c961_sendpacket(struct sk_buff *skb, struct net_device *dev)
445 {
446  struct dev_priv *priv = netdev_priv(dev);
447  unsigned int hdraddr, bufaddr;
448  unsigned int head;
449  unsigned long flags;
450 
451  head = priv->txhead;
452  hdraddr = priv->txhdr + (head << 3);
453  bufaddr = priv->txbuffer[head];
454  head += 1;
455  if (head >= TX_BUFFERS)
456  head = 0;
457 
458  am_writebuffer (dev, bufaddr, skb->data, skb->len);
459  am_writeword (dev, hdraddr + 4, -skb->len);
460  am_writeword (dev, hdraddr + 2, TMD_OWN|TMD_STP|TMD_ENP);
461  priv->txhead = head;
462 
463  spin_lock_irqsave(&priv->chip_lock, flags);
464  write_rreg (dev->base_addr, CSR0, CSR0_TDMD|CSR0_IENA);
465  spin_unlock_irqrestore(&priv->chip_lock, flags);
466 
467  /*
468  * If the next packet is owned by the ethernet device,
469  * then the tx ring is full and we can't add another
470  * packet.
471  */
472  if (am_readword(dev, priv->txhdr + (priv->txhead << 3) + 2) & TMD_OWN)
473  netif_stop_queue(dev);
474 
475  dev_kfree_skb(skb);
476 
477  return NETDEV_TX_OK;
478 }
479 
480 /*
481  * If we have a good packet(s), get it/them out of the buffers.
482  */
483 static void
484 am79c961_rx(struct net_device *dev, struct dev_priv *priv)
485 {
486  do {
487  struct sk_buff *skb;
488  u_int hdraddr;
489  u_int pktaddr;
490  u_int status;
491  int len;
492 
493  hdraddr = priv->rxhdr + (priv->rxtail << 3);
494  pktaddr = priv->rxbuffer[priv->rxtail];
495 
496  status = am_readword (dev, hdraddr + 2);
497  if (status & RMD_OWN) /* do we own it? */
498  break;
499 
500  priv->rxtail ++;
501  if (priv->rxtail >= RX_BUFFERS)
502  priv->rxtail = 0;
503 
504  if ((status & (RMD_ERR|RMD_STP|RMD_ENP)) != (RMD_STP|RMD_ENP)) {
505  am_writeword (dev, hdraddr + 2, RMD_OWN);
506  dev->stats.rx_errors++;
507  if (status & RMD_ERR) {
508  if (status & RMD_FRAM)
509  dev->stats.rx_frame_errors++;
510  if (status & RMD_CRC)
511  dev->stats.rx_crc_errors++;
512  } else if (status & RMD_STP)
513  dev->stats.rx_length_errors++;
514  continue;
515  }
516 
517  len = am_readword(dev, hdraddr + 6);
518  skb = netdev_alloc_skb(dev, len + 2);
519 
520  if (skb) {
521  skb_reserve(skb, 2);
522 
523  am_readbuffer(dev, pktaddr, skb_put(skb, len), len);
524  am_writeword(dev, hdraddr + 2, RMD_OWN);
525  skb->protocol = eth_type_trans(skb, dev);
526  netif_rx(skb);
527  dev->stats.rx_bytes += len;
528  dev->stats.rx_packets++;
529  } else {
530  am_writeword (dev, hdraddr + 2, RMD_OWN);
531  printk (KERN_WARNING "%s: memory squeeze, dropping packet.\n", dev->name);
532  dev->stats.rx_dropped++;
533  break;
534  }
535  } while (1);
536 }
537 
538 /*
539  * Update stats for the transmitted packet
540  */
541 static void
542 am79c961_tx(struct net_device *dev, struct dev_priv *priv)
543 {
544  do {
545  short len;
546  u_int hdraddr;
547  u_int status;
548 
549  hdraddr = priv->txhdr + (priv->txtail << 3);
550  status = am_readword (dev, hdraddr + 2);
551  if (status & TMD_OWN)
552  break;
553 
554  priv->txtail ++;
555  if (priv->txtail >= TX_BUFFERS)
556  priv->txtail = 0;
557 
558  if (status & TMD_ERR) {
559  u_int status2;
560 
561  dev->stats.tx_errors++;
562 
563  status2 = am_readword (dev, hdraddr + 6);
564 
565  /*
566  * Clear the error byte
567  */
568  am_writeword (dev, hdraddr + 6, 0);
569 
570  if (status2 & TST_RTRY)
571  dev->stats.collisions += 16;
572  if (status2 & TST_LCOL)
573  dev->stats.tx_window_errors++;
574  if (status2 & TST_LCAR)
575  dev->stats.tx_carrier_errors++;
576  if (status2 & TST_UFLO)
577  dev->stats.tx_fifo_errors++;
578  continue;
579  }
580  dev->stats.tx_packets++;
581  len = am_readword (dev, hdraddr + 4);
582  dev->stats.tx_bytes += -len;
583  } while (priv->txtail != priv->txhead);
584 
585  netif_wake_queue(dev);
586 }
587 
588 static irqreturn_t
589 am79c961_interrupt(int irq, void *dev_id)
590 {
591  struct net_device *dev = (struct net_device *)dev_id;
592  struct dev_priv *priv = netdev_priv(dev);
593  u_int status, n = 100;
594  int handled = 0;
595 
596  do {
597  status = read_rreg(dev->base_addr, CSR0);
598  write_rreg(dev->base_addr, CSR0, status &
599  (CSR0_IENA|CSR0_TINT|CSR0_RINT|
600  CSR0_MERR|CSR0_MISS|CSR0_CERR|CSR0_BABL));
601 
602  if (status & CSR0_RINT) {
603  handled = 1;
604  am79c961_rx(dev, priv);
605  }
606  if (status & CSR0_TINT) {
607  handled = 1;
608  am79c961_tx(dev, priv);
609  }
610  if (status & CSR0_MISS) {
611  handled = 1;
612  dev->stats.rx_dropped++;
613  }
614  if (status & CSR0_CERR) {
615  handled = 1;
616  mod_timer(&priv->timer, jiffies);
617  }
618  } while (--n && status & (CSR0_RINT | CSR0_TINT));
619 
620  return IRQ_RETVAL(handled);
621 }
622 
623 #ifdef CONFIG_NET_POLL_CONTROLLER
624 static void am79c961_poll_controller(struct net_device *dev)
625 {
626  unsigned long flags;
627  local_irq_save(flags);
628  am79c961_interrupt(dev->irq, dev);
629  local_irq_restore(flags);
630 }
631 #endif
632 
633 /*
634  * Initialise the chip. Note that we always expect
635  * to be entered with interrupts enabled.
636  */
637 static int
638 am79c961_hw_init(struct net_device *dev)
639 {
640  struct dev_priv *priv = netdev_priv(dev);
641 
642  spin_lock_irq(&priv->chip_lock);
643  write_rreg (dev->base_addr, CSR0, CSR0_STOP);
644  write_rreg (dev->base_addr, CSR3, CSR3_MASKALL);
645  spin_unlock_irq(&priv->chip_lock);
646 
647  am79c961_ramtest(dev, 0x66);
648  am79c961_ramtest(dev, 0x99);
649 
650  return 0;
651 }
652 
653 static void __init am79c961_banner(void)
654 {
655  static unsigned version_printed;
656 
657  if (net_debug && version_printed++ == 0)
658  printk(KERN_INFO "%s", version);
659 }
660 static const struct net_device_ops am79c961_netdev_ops = {
661  .ndo_open = am79c961_open,
662  .ndo_stop = am79c961_close,
663  .ndo_start_xmit = am79c961_sendpacket,
664  .ndo_set_rx_mode = am79c961_setmulticastlist,
665  .ndo_tx_timeout = am79c961_timeout,
666  .ndo_validate_addr = eth_validate_addr,
667  .ndo_change_mtu = eth_change_mtu,
668  .ndo_set_mac_address = eth_mac_addr,
669 #ifdef CONFIG_NET_POLL_CONTROLLER
670  .ndo_poll_controller = am79c961_poll_controller,
671 #endif
672 };
673 
674 static int __devinit am79c961_probe(struct platform_device *pdev)
675 {
676  struct resource *res;
677  struct net_device *dev;
678  struct dev_priv *priv;
679  int i, ret;
680 
681  res = platform_get_resource(pdev, IORESOURCE_IO, 0);
682  if (!res)
683  return -ENODEV;
684 
685  dev = alloc_etherdev(sizeof(struct dev_priv));
686  ret = -ENOMEM;
687  if (!dev)
688  goto out;
689 
690  SET_NETDEV_DEV(dev, &pdev->dev);
691 
692  priv = netdev_priv(dev);
693 
694  /*
695  * Fixed address and IRQ lines here.
696  * The PNP initialisation should have been
697  * done by the ether bootp loader.
698  */
699  dev->base_addr = res->start;
700  ret = platform_get_irq(pdev, 0);
701 
702  if (ret < 0) {
703  ret = -ENODEV;
704  goto nodev;
705  }
706  dev->irq = ret;
707 
708  ret = -ENODEV;
709  if (!request_region(dev->base_addr, 0x18, dev->name))
710  goto nodev;
711 
712  /*
713  * Reset the device.
714  */
715  inb(dev->base_addr + NET_RESET);
716  udelay(5);
717 
718  /*
719  * Check the manufacturer part of the
720  * ether address.
721  */
722  if (inb(dev->base_addr) != 0x08 ||
723  inb(dev->base_addr + 2) != 0x00 ||
724  inb(dev->base_addr + 4) != 0x2b)
725  goto release;
726 
727  for (i = 0; i < 6; i++)
728  dev->dev_addr[i] = inb(dev->base_addr + i * 2) & 0xff;
729 
730  am79c961_banner();
731 
732  spin_lock_init(&priv->chip_lock);
733  init_timer(&priv->timer);
734  priv->timer.data = (unsigned long)dev;
735  priv->timer.function = am79c961_timer;
736 
737  if (am79c961_hw_init(dev))
738  goto release;
739 
740  dev->netdev_ops = &am79c961_netdev_ops;
741 
742  ret = register_netdev(dev);
743  if (ret == 0) {
744  printk(KERN_INFO "%s: ether address %pM\n",
745  dev->name, dev->dev_addr);
746  return 0;
747  }
748 
749 release:
750  release_region(dev->base_addr, 0x18);
751 nodev:
752  free_netdev(dev);
753 out:
754  return ret;
755 }
756 
757 static struct platform_driver am79c961_driver = {
758  .probe = am79c961_probe,
759  .driver = {
760  .name = "am79c961",
761  },
762 };
763 
764 static int __init am79c961_init(void)
765 {
766  return platform_driver_register(&am79c961_driver);
767 }
768 
769 __initcall(am79c961_init);
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