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