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Merge tag 'for-linus-4.1-merge-window' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / drivers / net / ethernet / apple / macmace.c
1 /*
2 * Driver for the Macintosh 68K onboard MACE controller with PSC
3 * driven DMA. The MACE driver code is derived from mace.c. The
4 * Mac68k theory of operation is courtesy of the MacBSD wizards.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * Copyright (C) 1996 Paul Mackerras.
12 * Copyright (C) 1998 Alan Cox <alan@lxorguk.ukuu.org.uk>
13 *
14 * Modified heavily by Joshua M. Thompson based on Dave Huang's NetBSD driver
15 *
16 * Copyright (C) 2007 Finn Thain
17 *
18 * Converted to DMA API, converted to unified driver model,
19 * sync'd some routines with mace.c and fixed various bugs.
20 */
21
22
23 #include <linux/kernel.h>
24 #include <linux/module.h>
25 #include <linux/netdevice.h>
26 #include <linux/etherdevice.h>
27 #include <linux/delay.h>
28 #include <linux/string.h>
29 #include <linux/crc32.h>
30 #include <linux/bitrev.h>
31 #include <linux/dma-mapping.h>
32 #include <linux/platform_device.h>
33 #include <linux/gfp.h>
34 #include <linux/interrupt.h>
35 #include <asm/io.h>
36 #include <asm/macints.h>
37 #include <asm/mac_psc.h>
38 #include <asm/page.h>
39 #include "mace.h"
40
41 static char mac_mace_string[] = "macmace";
42
43 #define N_TX_BUFF_ORDER 0
44 #define N_TX_RING (1 << N_TX_BUFF_ORDER)
45 #define N_RX_BUFF_ORDER 3
46 #define N_RX_RING (1 << N_RX_BUFF_ORDER)
47
48 #define TX_TIMEOUT HZ
49
50 #define MACE_BUFF_SIZE 0x800
51
52 /* Chip rev needs workaround on HW & multicast addr change */
53 #define BROKEN_ADDRCHG_REV 0x0941
54
55 /* The MACE is simply wired down on a Mac68K box */
56
57 #define MACE_BASE (void *)(0x50F1C000)
58 #define MACE_PROM (void *)(0x50F08001)
59
60 struct mace_data {
61 volatile struct mace *mace;
62 unsigned char *tx_ring;
63 dma_addr_t tx_ring_phys;
64 unsigned char *rx_ring;
65 dma_addr_t rx_ring_phys;
66 int dma_intr;
67 int rx_slot, rx_tail;
68 int tx_slot, tx_sloti, tx_count;
69 int chipid;
70 struct device *device;
71 };
72
73 struct mace_frame {
74 u8 rcvcnt;
75 u8 pad1;
76 u8 rcvsts;
77 u8 pad2;
78 u8 rntpc;
79 u8 pad3;
80 u8 rcvcc;
81 u8 pad4;
82 u32 pad5;
83 u32 pad6;
84 u8 data[1];
85 /* And frame continues.. */
86 };
87
88 #define PRIV_BYTES sizeof(struct mace_data)
89
90 static int mace_open(struct net_device *dev);
91 static int mace_close(struct net_device *dev);
92 static int mace_xmit_start(struct sk_buff *skb, struct net_device *dev);
93 static void mace_set_multicast(struct net_device *dev);
94 static int mace_set_address(struct net_device *dev, void *addr);
95 static void mace_reset(struct net_device *dev);
96 static irqreturn_t mace_interrupt(int irq, void *dev_id);
97 static irqreturn_t mace_dma_intr(int irq, void *dev_id);
98 static void mace_tx_timeout(struct net_device *dev);
99 static void __mace_set_address(struct net_device *dev, void *addr);
100
101 /*
102 * Load a receive DMA channel with a base address and ring length
103 */
104
105 static void mace_load_rxdma_base(struct net_device *dev, int set)
106 {
107 struct mace_data *mp = netdev_priv(dev);
108
109 psc_write_word(PSC_ENETRD_CMD + set, 0x0100);
110 psc_write_long(PSC_ENETRD_ADDR + set, (u32) mp->rx_ring_phys);
111 psc_write_long(PSC_ENETRD_LEN + set, N_RX_RING);
112 psc_write_word(PSC_ENETRD_CMD + set, 0x9800);
113 mp->rx_tail = 0;
114 }
115
116 /*
117 * Reset the receive DMA subsystem
118 */
119
120 static void mace_rxdma_reset(struct net_device *dev)
121 {
122 struct mace_data *mp = netdev_priv(dev);
123 volatile struct mace *mace = mp->mace;
124 u8 maccc = mace->maccc;
125
126 mace->maccc = maccc & ~ENRCV;
127
128 psc_write_word(PSC_ENETRD_CTL, 0x8800);
129 mace_load_rxdma_base(dev, 0x00);
130 psc_write_word(PSC_ENETRD_CTL, 0x0400);
131
132 psc_write_word(PSC_ENETRD_CTL, 0x8800);
133 mace_load_rxdma_base(dev, 0x10);
134 psc_write_word(PSC_ENETRD_CTL, 0x0400);
135
136 mace->maccc = maccc;
137 mp->rx_slot = 0;
138
139 psc_write_word(PSC_ENETRD_CMD + PSC_SET0, 0x9800);
140 psc_write_word(PSC_ENETRD_CMD + PSC_SET1, 0x9800);
141 }
142
143 /*
144 * Reset the transmit DMA subsystem
145 */
146
147 static void mace_txdma_reset(struct net_device *dev)
148 {
149 struct mace_data *mp = netdev_priv(dev);
150 volatile struct mace *mace = mp->mace;
151 u8 maccc;
152
153 psc_write_word(PSC_ENETWR_CTL, 0x8800);
154
155 maccc = mace->maccc;
156 mace->maccc = maccc & ~ENXMT;
157
158 mp->tx_slot = mp->tx_sloti = 0;
159 mp->tx_count = N_TX_RING;
160
161 psc_write_word(PSC_ENETWR_CTL, 0x0400);
162 mace->maccc = maccc;
163 }
164
165 /*
166 * Disable DMA
167 */
168
169 static void mace_dma_off(struct net_device *dev)
170 {
171 psc_write_word(PSC_ENETRD_CTL, 0x8800);
172 psc_write_word(PSC_ENETRD_CTL, 0x1000);
173 psc_write_word(PSC_ENETRD_CMD + PSC_SET0, 0x1100);
174 psc_write_word(PSC_ENETRD_CMD + PSC_SET1, 0x1100);
175
176 psc_write_word(PSC_ENETWR_CTL, 0x8800);
177 psc_write_word(PSC_ENETWR_CTL, 0x1000);
178 psc_write_word(PSC_ENETWR_CMD + PSC_SET0, 0x1100);
179 psc_write_word(PSC_ENETWR_CMD + PSC_SET1, 0x1100);
180 }
181
182 static const struct net_device_ops mace_netdev_ops = {
183 .ndo_open = mace_open,
184 .ndo_stop = mace_close,
185 .ndo_start_xmit = mace_xmit_start,
186 .ndo_tx_timeout = mace_tx_timeout,
187 .ndo_set_rx_mode = mace_set_multicast,
188 .ndo_set_mac_address = mace_set_address,
189 .ndo_change_mtu = eth_change_mtu,
190 .ndo_validate_addr = eth_validate_addr,
191 };
192
193 /*
194 * Not really much of a probe. The hardware table tells us if this
195 * model of Macintrash has a MACE (AV macintoshes)
196 */
197
198 static int mace_probe(struct platform_device *pdev)
199 {
200 int j;
201 struct mace_data *mp;
202 unsigned char *addr;
203 struct net_device *dev;
204 unsigned char checksum = 0;
205 int err;
206
207 dev = alloc_etherdev(PRIV_BYTES);
208 if (!dev)
209 return -ENOMEM;
210
211 mp = netdev_priv(dev);
212
213 mp->device = &pdev->dev;
214 platform_set_drvdata(pdev, dev);
215 SET_NETDEV_DEV(dev, &pdev->dev);
216
217 dev->base_addr = (u32)MACE_BASE;
218 mp->mace = MACE_BASE;
219
220 dev->irq = IRQ_MAC_MACE;
221 mp->dma_intr = IRQ_MAC_MACE_DMA;
222
223 mp->chipid = mp->mace->chipid_hi << 8 | mp->mace->chipid_lo;
224
225 /*
226 * The PROM contains 8 bytes which total 0xFF when XOR'd
227 * together. Due to the usual peculiar apple brain damage
228 * the bytes are spaced out in a strange boundary and the
229 * bits are reversed.
230 */
231
232 addr = MACE_PROM;
233
234 for (j = 0; j < 6; ++j) {
235 u8 v = bitrev8(addr[j<<4]);
236 checksum ^= v;
237 dev->dev_addr[j] = v;
238 }
239 for (; j < 8; ++j) {
240 checksum ^= bitrev8(addr[j<<4]);
241 }
242
243 if (checksum != 0xFF) {
244 free_netdev(dev);
245 return -ENODEV;
246 }
247
248 dev->netdev_ops = &mace_netdev_ops;
249 dev->watchdog_timeo = TX_TIMEOUT;
250
251 printk(KERN_INFO "%s: 68K MACE, hardware address %pM\n",
252 dev->name, dev->dev_addr);
253
254 err = register_netdev(dev);
255 if (!err)
256 return 0;
257
258 free_netdev(dev);
259 return err;
260 }
261
262 /*
263 * Reset the chip.
264 */
265
266 static void mace_reset(struct net_device *dev)
267 {
268 struct mace_data *mp = netdev_priv(dev);
269 volatile struct mace *mb = mp->mace;
270 int i;
271
272 /* soft-reset the chip */
273 i = 200;
274 while (--i) {
275 mb->biucc = SWRST;
276 if (mb->biucc & SWRST) {
277 udelay(10);
278 continue;
279 }
280 break;
281 }
282 if (!i) {
283 printk(KERN_ERR "macmace: cannot reset chip!\n");
284 return;
285 }
286
287 mb->maccc = 0; /* turn off tx, rx */
288 mb->imr = 0xFF; /* disable all intrs for now */
289 i = mb->ir;
290
291 mb->biucc = XMTSP_64;
292 mb->utr = RTRD;
293 mb->fifocc = XMTFW_8 | RCVFW_64 | XMTFWU | RCVFWU;
294
295 mb->xmtfc = AUTO_PAD_XMIT; /* auto-pad short frames */
296 mb->rcvfc = 0;
297
298 /* load up the hardware address */
299 __mace_set_address(dev, dev->dev_addr);
300
301 /* clear the multicast filter */
302 if (mp->chipid == BROKEN_ADDRCHG_REV)
303 mb->iac = LOGADDR;
304 else {
305 mb->iac = ADDRCHG | LOGADDR;
306 while ((mb->iac & ADDRCHG) != 0)
307 ;
308 }
309 for (i = 0; i < 8; ++i)
310 mb->ladrf = 0;
311
312 /* done changing address */
313 if (mp->chipid != BROKEN_ADDRCHG_REV)
314 mb->iac = 0;
315
316 mb->plscc = PORTSEL_AUI;
317 }
318
319 /*
320 * Load the address on a mace controller.
321 */
322
323 static void __mace_set_address(struct net_device *dev, void *addr)
324 {
325 struct mace_data *mp = netdev_priv(dev);
326 volatile struct mace *mb = mp->mace;
327 unsigned char *p = addr;
328 int i;
329
330 /* load up the hardware address */
331 if (mp->chipid == BROKEN_ADDRCHG_REV)
332 mb->iac = PHYADDR;
333 else {
334 mb->iac = ADDRCHG | PHYADDR;
335 while ((mb->iac & ADDRCHG) != 0)
336 ;
337 }
338 for (i = 0; i < 6; ++i)
339 mb->padr = dev->dev_addr[i] = p[i];
340 if (mp->chipid != BROKEN_ADDRCHG_REV)
341 mb->iac = 0;
342 }
343
344 static int mace_set_address(struct net_device *dev, void *addr)
345 {
346 struct mace_data *mp = netdev_priv(dev);
347 volatile struct mace *mb = mp->mace;
348 unsigned long flags;
349 u8 maccc;
350
351 local_irq_save(flags);
352
353 maccc = mb->maccc;
354
355 __mace_set_address(dev, addr);
356
357 mb->maccc = maccc;
358
359 local_irq_restore(flags);
360
361 return 0;
362 }
363
364 /*
365 * Open the Macintosh MACE. Most of this is playing with the DMA
366 * engine. The ethernet chip is quite friendly.
367 */
368
369 static int mace_open(struct net_device *dev)
370 {
371 struct mace_data *mp = netdev_priv(dev);
372 volatile struct mace *mb = mp->mace;
373
374 /* reset the chip */
375 mace_reset(dev);
376
377 if (request_irq(dev->irq, mace_interrupt, 0, dev->name, dev)) {
378 printk(KERN_ERR "%s: can't get irq %d\n", dev->name, dev->irq);
379 return -EAGAIN;
380 }
381 if (request_irq(mp->dma_intr, mace_dma_intr, 0, dev->name, dev)) {
382 printk(KERN_ERR "%s: can't get irq %d\n", dev->name, mp->dma_intr);
383 free_irq(dev->irq, dev);
384 return -EAGAIN;
385 }
386
387 /* Allocate the DMA ring buffers */
388
389 mp->tx_ring = dma_alloc_coherent(mp->device,
390 N_TX_RING * MACE_BUFF_SIZE,
391 &mp->tx_ring_phys, GFP_KERNEL);
392 if (mp->tx_ring == NULL)
393 goto out1;
394
395 mp->rx_ring = dma_alloc_coherent(mp->device,
396 N_RX_RING * MACE_BUFF_SIZE,
397 &mp->rx_ring_phys, GFP_KERNEL);
398 if (mp->rx_ring == NULL)
399 goto out2;
400
401 mace_dma_off(dev);
402
403 /* Not sure what these do */
404
405 psc_write_word(PSC_ENETWR_CTL, 0x9000);
406 psc_write_word(PSC_ENETRD_CTL, 0x9000);
407 psc_write_word(PSC_ENETWR_CTL, 0x0400);
408 psc_write_word(PSC_ENETRD_CTL, 0x0400);
409
410 mace_rxdma_reset(dev);
411 mace_txdma_reset(dev);
412
413 /* turn it on! */
414 mb->maccc = ENXMT | ENRCV;
415 /* enable all interrupts except receive interrupts */
416 mb->imr = RCVINT;
417 return 0;
418
419 out2:
420 dma_free_coherent(mp->device, N_TX_RING * MACE_BUFF_SIZE,
421 mp->tx_ring, mp->tx_ring_phys);
422 out1:
423 free_irq(dev->irq, dev);
424 free_irq(mp->dma_intr, dev);
425 return -ENOMEM;
426 }
427
428 /*
429 * Shut down the mace and its interrupt channel
430 */
431
432 static int mace_close(struct net_device *dev)
433 {
434 struct mace_data *mp = netdev_priv(dev);
435 volatile struct mace *mb = mp->mace;
436
437 mb->maccc = 0; /* disable rx and tx */
438 mb->imr = 0xFF; /* disable all irqs */
439 mace_dma_off(dev); /* disable rx and tx dma */
440
441 return 0;
442 }
443
444 /*
445 * Transmit a frame
446 */
447
448 static int mace_xmit_start(struct sk_buff *skb, struct net_device *dev)
449 {
450 struct mace_data *mp = netdev_priv(dev);
451 unsigned long flags;
452
453 /* Stop the queue since there's only the one buffer */
454
455 local_irq_save(flags);
456 netif_stop_queue(dev);
457 if (!mp->tx_count) {
458 printk(KERN_ERR "macmace: tx queue running but no free buffers.\n");
459 local_irq_restore(flags);
460 return NETDEV_TX_BUSY;
461 }
462 mp->tx_count--;
463 local_irq_restore(flags);
464
465 dev->stats.tx_packets++;
466 dev->stats.tx_bytes += skb->len;
467
468 /* We need to copy into our xmit buffer to take care of alignment and caching issues */
469 skb_copy_from_linear_data(skb, mp->tx_ring, skb->len);
470
471 /* load the Tx DMA and fire it off */
472
473 psc_write_long(PSC_ENETWR_ADDR + mp->tx_slot, (u32) mp->tx_ring_phys);
474 psc_write_long(PSC_ENETWR_LEN + mp->tx_slot, skb->len);
475 psc_write_word(PSC_ENETWR_CMD + mp->tx_slot, 0x9800);
476
477 mp->tx_slot ^= 0x10;
478
479 dev_kfree_skb(skb);
480
481 return NETDEV_TX_OK;
482 }
483
484 static void mace_set_multicast(struct net_device *dev)
485 {
486 struct mace_data *mp = netdev_priv(dev);
487 volatile struct mace *mb = mp->mace;
488 int i;
489 u32 crc;
490 u8 maccc;
491 unsigned long flags;
492
493 local_irq_save(flags);
494 maccc = mb->maccc;
495 mb->maccc &= ~PROM;
496
497 if (dev->flags & IFF_PROMISC) {
498 mb->maccc |= PROM;
499 } else {
500 unsigned char multicast_filter[8];
501 struct netdev_hw_addr *ha;
502
503 if (dev->flags & IFF_ALLMULTI) {
504 for (i = 0; i < 8; i++) {
505 multicast_filter[i] = 0xFF;
506 }
507 } else {
508 for (i = 0; i < 8; i++)
509 multicast_filter[i] = 0;
510 netdev_for_each_mc_addr(ha, dev) {
511 crc = ether_crc_le(6, ha->addr);
512 /* bit number in multicast_filter */
513 i = crc >> 26;
514 multicast_filter[i >> 3] |= 1 << (i & 7);
515 }
516 }
517
518 if (mp->chipid == BROKEN_ADDRCHG_REV)
519 mb->iac = LOGADDR;
520 else {
521 mb->iac = ADDRCHG | LOGADDR;
522 while ((mb->iac & ADDRCHG) != 0)
523 ;
524 }
525 for (i = 0; i < 8; ++i)
526 mb->ladrf = multicast_filter[i];
527 if (mp->chipid != BROKEN_ADDRCHG_REV)
528 mb->iac = 0;
529 }
530
531 mb->maccc = maccc;
532 local_irq_restore(flags);
533 }
534
535 static void mace_handle_misc_intrs(struct net_device *dev, int intr)
536 {
537 struct mace_data *mp = netdev_priv(dev);
538 volatile struct mace *mb = mp->mace;
539 static int mace_babbles, mace_jabbers;
540
541 if (intr & MPCO)
542 dev->stats.rx_missed_errors += 256;
543 dev->stats.rx_missed_errors += mb->mpc; /* reading clears it */
544 if (intr & RNTPCO)
545 dev->stats.rx_length_errors += 256;
546 dev->stats.rx_length_errors += mb->rntpc; /* reading clears it */
547 if (intr & CERR)
548 ++dev->stats.tx_heartbeat_errors;
549 if (intr & BABBLE)
550 if (mace_babbles++ < 4)
551 printk(KERN_DEBUG "macmace: babbling transmitter\n");
552 if (intr & JABBER)
553 if (mace_jabbers++ < 4)
554 printk(KERN_DEBUG "macmace: jabbering transceiver\n");
555 }
556
557 static irqreturn_t mace_interrupt(int irq, void *dev_id)
558 {
559 struct net_device *dev = (struct net_device *) dev_id;
560 struct mace_data *mp = netdev_priv(dev);
561 volatile struct mace *mb = mp->mace;
562 int intr, fs;
563 unsigned long flags;
564
565 /* don't want the dma interrupt handler to fire */
566 local_irq_save(flags);
567
568 intr = mb->ir; /* read interrupt register */
569 mace_handle_misc_intrs(dev, intr);
570
571 if (intr & XMTINT) {
572 fs = mb->xmtfs;
573 if ((fs & XMTSV) == 0) {
574 printk(KERN_ERR "macmace: xmtfs not valid! (fs=%x)\n", fs);
575 mace_reset(dev);
576 /*
577 * XXX mace likes to hang the machine after a xmtfs error.
578 * This is hard to reproduce, resetting *may* help
579 */
580 }
581 /* dma should have finished */
582 if (!mp->tx_count) {
583 printk(KERN_DEBUG "macmace: tx ring ran out? (fs=%x)\n", fs);
584 }
585 /* Update stats */
586 if (fs & (UFLO|LCOL|LCAR|RTRY)) {
587 ++dev->stats.tx_errors;
588 if (fs & LCAR)
589 ++dev->stats.tx_carrier_errors;
590 else if (fs & (UFLO|LCOL|RTRY)) {
591 ++dev->stats.tx_aborted_errors;
592 if (mb->xmtfs & UFLO) {
593 printk(KERN_ERR "%s: DMA underrun.\n", dev->name);
594 dev->stats.tx_fifo_errors++;
595 mace_txdma_reset(dev);
596 }
597 }
598 }
599 }
600
601 if (mp->tx_count)
602 netif_wake_queue(dev);
603
604 local_irq_restore(flags);
605
606 return IRQ_HANDLED;
607 }
608
609 static void mace_tx_timeout(struct net_device *dev)
610 {
611 struct mace_data *mp = netdev_priv(dev);
612 volatile struct mace *mb = mp->mace;
613 unsigned long flags;
614
615 local_irq_save(flags);
616
617 /* turn off both tx and rx and reset the chip */
618 mb->maccc = 0;
619 printk(KERN_ERR "macmace: transmit timeout - resetting\n");
620 mace_txdma_reset(dev);
621 mace_reset(dev);
622
623 /* restart rx dma */
624 mace_rxdma_reset(dev);
625
626 mp->tx_count = N_TX_RING;
627 netif_wake_queue(dev);
628
629 /* turn it on! */
630 mb->maccc = ENXMT | ENRCV;
631 /* enable all interrupts except receive interrupts */
632 mb->imr = RCVINT;
633
634 local_irq_restore(flags);
635 }
636
637 /*
638 * Handle a newly arrived frame
639 */
640
641 static void mace_dma_rx_frame(struct net_device *dev, struct mace_frame *mf)
642 {
643 struct sk_buff *skb;
644 unsigned int frame_status = mf->rcvsts;
645
646 if (frame_status & (RS_OFLO | RS_CLSN | RS_FRAMERR | RS_FCSERR)) {
647 dev->stats.rx_errors++;
648 if (frame_status & RS_OFLO) {
649 printk(KERN_DEBUG "%s: fifo overflow.\n", dev->name);
650 dev->stats.rx_fifo_errors++;
651 }
652 if (frame_status & RS_CLSN)
653 dev->stats.collisions++;
654 if (frame_status & RS_FRAMERR)
655 dev->stats.rx_frame_errors++;
656 if (frame_status & RS_FCSERR)
657 dev->stats.rx_crc_errors++;
658 } else {
659 unsigned int frame_length = mf->rcvcnt + ((frame_status & 0x0F) << 8 );
660
661 skb = netdev_alloc_skb(dev, frame_length + 2);
662 if (!skb) {
663 dev->stats.rx_dropped++;
664 return;
665 }
666 skb_reserve(skb, 2);
667 memcpy(skb_put(skb, frame_length), mf->data, frame_length);
668
669 skb->protocol = eth_type_trans(skb, dev);
670 netif_rx(skb);
671 dev->stats.rx_packets++;
672 dev->stats.rx_bytes += frame_length;
673 }
674 }
675
676 /*
677 * The PSC has passed us a DMA interrupt event.
678 */
679
680 static irqreturn_t mace_dma_intr(int irq, void *dev_id)
681 {
682 struct net_device *dev = (struct net_device *) dev_id;
683 struct mace_data *mp = netdev_priv(dev);
684 int left, head;
685 u16 status;
686 u32 baka;
687
688 /* Not sure what this does */
689
690 while ((baka = psc_read_long(PSC_MYSTERY)) != psc_read_long(PSC_MYSTERY));
691 if (!(baka & 0x60000000)) return IRQ_NONE;
692
693 /*
694 * Process the read queue
695 */
696
697 status = psc_read_word(PSC_ENETRD_CTL);
698
699 if (status & 0x2000) {
700 mace_rxdma_reset(dev);
701 } else if (status & 0x0100) {
702 psc_write_word(PSC_ENETRD_CMD + mp->rx_slot, 0x1100);
703
704 left = psc_read_long(PSC_ENETRD_LEN + mp->rx_slot);
705 head = N_RX_RING - left;
706
707 /* Loop through the ring buffer and process new packages */
708
709 while (mp->rx_tail < head) {
710 mace_dma_rx_frame(dev, (struct mace_frame*) (mp->rx_ring
711 + (mp->rx_tail * MACE_BUFF_SIZE)));
712 mp->rx_tail++;
713 }
714
715 /* If we're out of buffers in this ring then switch to */
716 /* the other set, otherwise just reactivate this one. */
717
718 if (!left) {
719 mace_load_rxdma_base(dev, mp->rx_slot);
720 mp->rx_slot ^= 0x10;
721 } else {
722 psc_write_word(PSC_ENETRD_CMD + mp->rx_slot, 0x9800);
723 }
724 }
725
726 /*
727 * Process the write queue
728 */
729
730 status = psc_read_word(PSC_ENETWR_CTL);
731
732 if (status & 0x2000) {
733 mace_txdma_reset(dev);
734 } else if (status & 0x0100) {
735 psc_write_word(PSC_ENETWR_CMD + mp->tx_sloti, 0x0100);
736 mp->tx_sloti ^= 0x10;
737 mp->tx_count++;
738 }
739 return IRQ_HANDLED;
740 }
741
742 MODULE_LICENSE("GPL");
743 MODULE_DESCRIPTION("Macintosh MACE ethernet driver");
744 MODULE_ALIAS("platform:macmace");
745
746 static int mac_mace_device_remove(struct platform_device *pdev)
747 {
748 struct net_device *dev = platform_get_drvdata(pdev);
749 struct mace_data *mp = netdev_priv(dev);
750
751 unregister_netdev(dev);
752
753 free_irq(dev->irq, dev);
754 free_irq(IRQ_MAC_MACE_DMA, dev);
755
756 dma_free_coherent(mp->device, N_RX_RING * MACE_BUFF_SIZE,
757 mp->rx_ring, mp->rx_ring_phys);
758 dma_free_coherent(mp->device, N_TX_RING * MACE_BUFF_SIZE,
759 mp->tx_ring, mp->tx_ring_phys);
760
761 free_netdev(dev);
762
763 return 0;
764 }
765
766 static struct platform_driver mac_mace_driver = {
767 .probe = mace_probe,
768 .remove = mac_mace_device_remove,
769 .driver = {
770 .name = mac_mace_string,
771 },
772 };
773
774 static int __init mac_mace_init_module(void)
775 {
776 if (!MACH_IS_MAC)
777 return -ENODEV;
778
779 return platform_driver_register(&mac_mace_driver);
780 }
781
782 static void __exit mac_mace_cleanup_module(void)
783 {
784 platform_driver_unregister(&mac_mace_driver);
785 }
786
787 module_init(mac_mace_init_module);
788 module_exit(mac_mace_cleanup_module);
Linux kernel - Deliverables
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