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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Network device driver for the MACE ethernet controller on
4 * Apple Powermacs. Assumes it's under a DBDMA controller.
5 *
6 * Copyright (C) 1996 Paul Mackerras.
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/netdevice.h>
12#include <linux/etherdevice.h>
13#include <linux/delay.h>
14#include <linux/string.h>
15#include <linux/timer.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/crc32.h>
19#include <linux/spinlock.h>
20#include <linux/bitrev.h>
21#include <linux/slab.h>
22#include <linux/pgtable.h>
23#include <asm/dbdma.h>
24#include <asm/io.h>
25#include <asm/macio.h>
26
27#include "mace.h"
28
29static int port_aaui = -1;
30
31#define N_RX_RING 8
32#define N_TX_RING 6
33#define MAX_TX_ACTIVE 1
34#define NCMDS_TX 1 /* dma commands per element in tx ring */
35#define RX_BUFLEN (ETH_FRAME_LEN + 8)
36#define TX_TIMEOUT HZ /* 1 second */
37
38/* Chip rev needs workaround on HW & multicast addr change */
39#define BROKEN_ADDRCHG_REV 0x0941
40
41/* Bits in transmit DMA status */
42#define TX_DMA_ERR 0x80
43
44struct mace_data {
45 volatile struct mace __iomem *mace;
46 volatile struct dbdma_regs __iomem *tx_dma;
47 int tx_dma_intr;
48 volatile struct dbdma_regs __iomem *rx_dma;
49 int rx_dma_intr;
50 volatile struct dbdma_cmd *tx_cmds; /* xmit dma command list */
51 volatile struct dbdma_cmd *rx_cmds; /* recv dma command list */
52 struct sk_buff *rx_bufs[N_RX_RING];
53 int rx_fill;
54 int rx_empty;
55 struct sk_buff *tx_bufs[N_TX_RING];
56 int tx_fill;
57 int tx_empty;
58 unsigned char maccc;
59 unsigned char tx_fullup;
60 unsigned char tx_active;
61 unsigned char tx_bad_runt;
62 struct timer_list tx_timeout;
63 int timeout_active;
64 int port_aaui;
65 int chipid;
66 struct macio_dev *mdev;
67 spinlock_t lock;
68};
69
70/*
71 * Number of bytes of private data per MACE: allow enough for
72 * the rx and tx dma commands plus a branch dma command each,
73 * and another 16 bytes to allow us to align the dma command
74 * buffers on a 16 byte boundary.
75 */
76#define PRIV_BYTES (sizeof(struct mace_data) \
77 + (N_RX_RING + NCMDS_TX * N_TX_RING + 3) * sizeof(struct dbdma_cmd))
78
79static int mace_open(struct net_device *dev);
80static int mace_close(struct net_device *dev);
81static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev);
82static void mace_set_multicast(struct net_device *dev);
83static void mace_reset(struct net_device *dev);
84static int mace_set_address(struct net_device *dev, void *addr);
85static irqreturn_t mace_interrupt(int irq, void *dev_id);
86static irqreturn_t mace_txdma_intr(int irq, void *dev_id);
87static irqreturn_t mace_rxdma_intr(int irq, void *dev_id);
88static void mace_set_timeout(struct net_device *dev);
89static void mace_tx_timeout(struct timer_list *t);
90static inline void dbdma_reset(volatile struct dbdma_regs __iomem *dma);
91static inline void mace_clean_rings(struct mace_data *mp);
92static void __mace_set_address(struct net_device *dev, const void *addr);
93
94/*
95 * If we can't get a skbuff when we need it, we use this area for DMA.
96 */
97static unsigned char *dummy_buf;
98
99static const struct net_device_ops mace_netdev_ops = {
100 .ndo_open = mace_open,
101 .ndo_stop = mace_close,
102 .ndo_start_xmit = mace_xmit_start,
103 .ndo_set_rx_mode = mace_set_multicast,
104 .ndo_set_mac_address = mace_set_address,
105 .ndo_validate_addr = eth_validate_addr,
106};
107
108static int mace_probe(struct macio_dev *mdev, const struct of_device_id *match)
109{
110 struct device_node *mace = macio_get_of_node(mdev);
111 struct net_device *dev;
112 struct mace_data *mp;
113 const unsigned char *addr;
114 u8 macaddr[ETH_ALEN];
115 int j, rev, rc = -EBUSY;
116
117 if (macio_resource_count(mdev) != 3 || macio_irq_count(mdev) != 3) {
118 printk(KERN_ERR "can't use MACE %pOF: need 3 addrs and 3 irqs\n",
119 mace);
120 return -ENODEV;
121 }
122
123 addr = of_get_property(mace, "mac-address", NULL);
124 if (addr == NULL) {
125 addr = of_get_property(mace, "local-mac-address", NULL);
126 if (addr == NULL) {
127 printk(KERN_ERR "Can't get mac-address for MACE %pOF\n",
128 mace);
129 return -ENODEV;
130 }
131 }
132
133 /*
134 * lazy allocate the driver-wide dummy buffer. (Note that we
135 * never have more than one MACE in the system anyway)
136 */
137 if (dummy_buf == NULL) {
138 dummy_buf = kmalloc(RX_BUFLEN+2, GFP_KERNEL);
139 if (dummy_buf == NULL)
140 return -ENOMEM;
141 }
142
143 if (macio_request_resources(mdev, "mace")) {
144 printk(KERN_ERR "MACE: can't request IO resources !\n");
145 return -EBUSY;
146 }
147
148 dev = alloc_etherdev(PRIV_BYTES);
149 if (!dev) {
150 rc = -ENOMEM;
151 goto err_release;
152 }
153 SET_NETDEV_DEV(dev, &mdev->ofdev.dev);
154
155 mp = netdev_priv(dev);
156 mp->mdev = mdev;
157 macio_set_drvdata(mdev, dev);
158
159 dev->base_addr = macio_resource_start(mdev, 0);
160 mp->mace = ioremap(dev->base_addr, 0x1000);
161 if (mp->mace == NULL) {
162 printk(KERN_ERR "MACE: can't map IO resources !\n");
163 rc = -ENOMEM;
164 goto err_free;
165 }
166 dev->irq = macio_irq(mdev, 0);
167
168 rev = addr[0] == 0 && addr[1] == 0xA0;
169 for (j = 0; j < 6; ++j) {
170 macaddr[j] = rev ? bitrev8(addr[j]): addr[j];
171 }
172 eth_hw_addr_set(dev, macaddr);
173 mp->chipid = (in_8(&mp->mace->chipid_hi) << 8) |
174 in_8(&mp->mace->chipid_lo);
175
176
177 mp = netdev_priv(dev);
178 mp->maccc = ENXMT | ENRCV;
179
180 mp->tx_dma = ioremap(macio_resource_start(mdev, 1), 0x1000);
181 if (mp->tx_dma == NULL) {
182 printk(KERN_ERR "MACE: can't map TX DMA resources !\n");
183 rc = -ENOMEM;
184 goto err_unmap_io;
185 }
186 mp->tx_dma_intr = macio_irq(mdev, 1);
187
188 mp->rx_dma = ioremap(macio_resource_start(mdev, 2), 0x1000);
189 if (mp->rx_dma == NULL) {
190 printk(KERN_ERR "MACE: can't map RX DMA resources !\n");
191 rc = -ENOMEM;
192 goto err_unmap_tx_dma;
193 }
194 mp->rx_dma_intr = macio_irq(mdev, 2);
195
196 mp->tx_cmds = (volatile struct dbdma_cmd *) DBDMA_ALIGN(mp + 1);
197 mp->rx_cmds = mp->tx_cmds + NCMDS_TX * N_TX_RING + 1;
198
199 memset((char *) mp->tx_cmds, 0,
200 (NCMDS_TX*N_TX_RING + N_RX_RING + 2) * sizeof(struct dbdma_cmd));
201 timer_setup(&mp->tx_timeout, mace_tx_timeout, 0);
202 spin_lock_init(&mp->lock);
203 mp->timeout_active = 0;
204
205 if (port_aaui >= 0)
206 mp->port_aaui = port_aaui;
207 else {
208 /* Apple Network Server uses the AAUI port */
209 if (of_machine_is_compatible("AAPL,ShinerESB"))
210 mp->port_aaui = 1;
211 else {
212#ifdef CONFIG_MACE_AAUI_PORT
213 mp->port_aaui = 1;
214#else
215 mp->port_aaui = 0;
216#endif
217 }
218 }
219
220 dev->netdev_ops = &mace_netdev_ops;
221
222 /*
223 * Most of what is below could be moved to mace_open()
224 */
225 mace_reset(dev);
226
227 rc = request_irq(dev->irq, mace_interrupt, 0, "MACE", dev);
228 if (rc) {
229 printk(KERN_ERR "MACE: can't get irq %d\n", dev->irq);
230 goto err_unmap_rx_dma;
231 }
232 rc = request_irq(mp->tx_dma_intr, mace_txdma_intr, 0, "MACE-txdma", dev);
233 if (rc) {
234 printk(KERN_ERR "MACE: can't get irq %d\n", mp->tx_dma_intr);
235 goto err_free_irq;
236 }
237 rc = request_irq(mp->rx_dma_intr, mace_rxdma_intr, 0, "MACE-rxdma", dev);
238 if (rc) {
239 printk(KERN_ERR "MACE: can't get irq %d\n", mp->rx_dma_intr);
240 goto err_free_tx_irq;
241 }
242
243 rc = register_netdev(dev);
244 if (rc) {
245 printk(KERN_ERR "MACE: Cannot register net device, aborting.\n");
246 goto err_free_rx_irq;
247 }
248
249 printk(KERN_INFO "%s: MACE at %pM, chip revision %d.%d\n",
250 dev->name, dev->dev_addr,
251 mp->chipid >> 8, mp->chipid & 0xff);
252
253 return 0;
254
255 err_free_rx_irq:
256 free_irq(macio_irq(mdev, 2), dev);
257 err_free_tx_irq:
258 free_irq(macio_irq(mdev, 1), dev);
259 err_free_irq:
260 free_irq(macio_irq(mdev, 0), dev);
261 err_unmap_rx_dma:
262 iounmap(mp->rx_dma);
263 err_unmap_tx_dma:
264 iounmap(mp->tx_dma);
265 err_unmap_io:
266 iounmap(mp->mace);
267 err_free:
268 free_netdev(dev);
269 err_release:
270 macio_release_resources(mdev);
271
272 return rc;
273}
274
275static int mace_remove(struct macio_dev *mdev)
276{
277 struct net_device *dev = macio_get_drvdata(mdev);
278 struct mace_data *mp;
279
280 BUG_ON(dev == NULL);
281
282 macio_set_drvdata(mdev, NULL);
283
284 mp = netdev_priv(dev);
285
286 unregister_netdev(dev);
287
288 free_irq(dev->irq, dev);
289 free_irq(mp->tx_dma_intr, dev);
290 free_irq(mp->rx_dma_intr, dev);
291
292 iounmap(mp->rx_dma);
293 iounmap(mp->tx_dma);
294 iounmap(mp->mace);
295
296 free_netdev(dev);
297
298 macio_release_resources(mdev);
299
300 return 0;
301}
302
303static void dbdma_reset(volatile struct dbdma_regs __iomem *dma)
304{
305 int i;
306
307 out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16);
308
309 /*
310 * Yes this looks peculiar, but apparently it needs to be this
311 * way on some machines.
312 */
313 for (i = 200; i > 0; --i)
314 if (le32_to_cpu(dma->control) & RUN)
315 udelay(1);
316}
317
318static void mace_reset(struct net_device *dev)
319{
320 struct mace_data *mp = netdev_priv(dev);
321 volatile struct mace __iomem *mb = mp->mace;
322 int i;
323
324 /* soft-reset the chip */
325 i = 200;
326 while (--i) {
327 out_8(&mb->biucc, SWRST);
328 if (in_8(&mb->biucc) & SWRST) {
329 udelay(10);
330 continue;
331 }
332 break;
333 }
334 if (!i) {
335 printk(KERN_ERR "mace: cannot reset chip!\n");
336 return;
337 }
338
339 out_8(&mb->imr, 0xff); /* disable all intrs for now */
340 i = in_8(&mb->ir);
341 out_8(&mb->maccc, 0); /* turn off tx, rx */
342
343 out_8(&mb->biucc, XMTSP_64);
344 out_8(&mb->utr, RTRD);
345 out_8(&mb->fifocc, RCVFW_32 | XMTFW_16 | XMTFWU | RCVFWU | XMTBRST);
346 out_8(&mb->xmtfc, AUTO_PAD_XMIT); /* auto-pad short frames */
347 out_8(&mb->rcvfc, 0);
348
349 /* load up the hardware address */
350 __mace_set_address(dev, dev->dev_addr);
351
352 /* clear the multicast filter */
353 if (mp->chipid == BROKEN_ADDRCHG_REV)
354 out_8(&mb->iac, LOGADDR);
355 else {
356 out_8(&mb->iac, ADDRCHG | LOGADDR);
357 while ((in_8(&mb->iac) & ADDRCHG) != 0)
358 ;
359 }
360 for (i = 0; i < 8; ++i)
361 out_8(&mb->ladrf, 0);
362
363 /* done changing address */
364 if (mp->chipid != BROKEN_ADDRCHG_REV)
365 out_8(&mb->iac, 0);
366
367 if (mp->port_aaui)
368 out_8(&mb->plscc, PORTSEL_AUI + ENPLSIO);
369 else
370 out_8(&mb->plscc, PORTSEL_GPSI + ENPLSIO);
371}
372
373static void __mace_set_address(struct net_device *dev, const void *addr)
374{
375 struct mace_data *mp = netdev_priv(dev);
376 volatile struct mace __iomem *mb = mp->mace;
377 const unsigned char *p = addr;
378 u8 macaddr[ETH_ALEN];
379 int i;
380
381 /* load up the hardware address */
382 if (mp->chipid == BROKEN_ADDRCHG_REV)
383 out_8(&mb->iac, PHYADDR);
384 else {
385 out_8(&mb->iac, ADDRCHG | PHYADDR);
386 while ((in_8(&mb->iac) & ADDRCHG) != 0)
387 ;
388 }
389 for (i = 0; i < 6; ++i)
390 out_8(&mb->padr, macaddr[i] = p[i]);
391
392 eth_hw_addr_set(dev, macaddr);
393
394 if (mp->chipid != BROKEN_ADDRCHG_REV)
395 out_8(&mb->iac, 0);
396}
397
398static int mace_set_address(struct net_device *dev, void *addr)
399{
400 struct mace_data *mp = netdev_priv(dev);
401 volatile struct mace __iomem *mb = mp->mace;
402 unsigned long flags;
403
404 spin_lock_irqsave(&mp->lock, flags);
405
406 __mace_set_address(dev, addr);
407
408 /* note: setting ADDRCHG clears ENRCV */
409 out_8(&mb->maccc, mp->maccc);
410
411 spin_unlock_irqrestore(&mp->lock, flags);
412 return 0;
413}
414
415static inline void mace_clean_rings(struct mace_data *mp)
416{
417 int i;
418
419 /* free some skb's */
420 for (i = 0; i < N_RX_RING; ++i) {
421 if (mp->rx_bufs[i] != NULL) {
422 dev_kfree_skb(mp->rx_bufs[i]);
423 mp->rx_bufs[i] = NULL;
424 }
425 }
426 for (i = mp->tx_empty; i != mp->tx_fill; ) {
427 dev_kfree_skb(mp->tx_bufs[i]);
428 if (++i >= N_TX_RING)
429 i = 0;
430 }
431}
432
433static int mace_open(struct net_device *dev)
434{
435 struct mace_data *mp = netdev_priv(dev);
436 volatile struct mace __iomem *mb = mp->mace;
437 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
438 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
439 volatile struct dbdma_cmd *cp;
440 int i;
441 struct sk_buff *skb;
442 unsigned char *data;
443
444 /* reset the chip */
445 mace_reset(dev);
446
447 /* initialize list of sk_buffs for receiving and set up recv dma */
448 mace_clean_rings(mp);
449 memset((char *)mp->rx_cmds, 0, N_RX_RING * sizeof(struct dbdma_cmd));
450 cp = mp->rx_cmds;
451 for (i = 0; i < N_RX_RING - 1; ++i) {
452 skb = netdev_alloc_skb(dev, RX_BUFLEN + 2);
453 if (!skb) {
454 data = dummy_buf;
455 } else {
456 skb_reserve(skb, 2); /* so IP header lands on 4-byte bdry */
457 data = skb->data;
458 }
459 mp->rx_bufs[i] = skb;
460 cp->req_count = cpu_to_le16(RX_BUFLEN);
461 cp->command = cpu_to_le16(INPUT_LAST + INTR_ALWAYS);
462 cp->phy_addr = cpu_to_le32(virt_to_bus(data));
463 cp->xfer_status = 0;
464 ++cp;
465 }
466 mp->rx_bufs[i] = NULL;
467 cp->command = cpu_to_le16(DBDMA_STOP);
468 mp->rx_fill = i;
469 mp->rx_empty = 0;
470
471 /* Put a branch back to the beginning of the receive command list */
472 ++cp;
473 cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS);
474 cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->rx_cmds));
475
476 /* start rx dma */
477 out_le32(&rd->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
478 out_le32(&rd->cmdptr, virt_to_bus(mp->rx_cmds));
479 out_le32(&rd->control, (RUN << 16) | RUN);
480
481 /* put a branch at the end of the tx command list */
482 cp = mp->tx_cmds + NCMDS_TX * N_TX_RING;
483 cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS);
484 cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->tx_cmds));
485
486 /* reset tx dma */
487 out_le32(&td->control, (RUN|PAUSE|FLUSH|WAKE) << 16);
488 out_le32(&td->cmdptr, virt_to_bus(mp->tx_cmds));
489 mp->tx_fill = 0;
490 mp->tx_empty = 0;
491 mp->tx_fullup = 0;
492 mp->tx_active = 0;
493 mp->tx_bad_runt = 0;
494
495 /* turn it on! */
496 out_8(&mb->maccc, mp->maccc);
497 /* enable all interrupts except receive interrupts */
498 out_8(&mb->imr, RCVINT);
499
500 return 0;
501}
502
503static int mace_close(struct net_device *dev)
504{
505 struct mace_data *mp = netdev_priv(dev);
506 volatile struct mace __iomem *mb = mp->mace;
507 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
508 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
509
510 /* disable rx and tx */
511 out_8(&mb->maccc, 0);
512 out_8(&mb->imr, 0xff); /* disable all intrs */
513
514 /* disable rx and tx dma */
515 rd->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
516 td->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
517
518 mace_clean_rings(mp);
519
520 return 0;
521}
522
523static inline void mace_set_timeout(struct net_device *dev)
524{
525 struct mace_data *mp = netdev_priv(dev);
526
527 if (mp->timeout_active)
528 del_timer(&mp->tx_timeout);
529 mp->tx_timeout.expires = jiffies + TX_TIMEOUT;
530 add_timer(&mp->tx_timeout);
531 mp->timeout_active = 1;
532}
533
534static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev)
535{
536 struct mace_data *mp = netdev_priv(dev);
537 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
538 volatile struct dbdma_cmd *cp, *np;
539 unsigned long flags;
540 int fill, next, len;
541
542 /* see if there's a free slot in the tx ring */
543 spin_lock_irqsave(&mp->lock, flags);
544 fill = mp->tx_fill;
545 next = fill + 1;
546 if (next >= N_TX_RING)
547 next = 0;
548 if (next == mp->tx_empty) {
549 netif_stop_queue(dev);
550 mp->tx_fullup = 1;
551 spin_unlock_irqrestore(&mp->lock, flags);
552 return NETDEV_TX_BUSY; /* can't take it at the moment */
553 }
554 spin_unlock_irqrestore(&mp->lock, flags);
555
556 /* partially fill in the dma command block */
557 len = skb->len;
558 if (len > ETH_FRAME_LEN) {
559 printk(KERN_DEBUG "mace: xmit frame too long (%d)\n", len);
560 len = ETH_FRAME_LEN;
561 }
562 mp->tx_bufs[fill] = skb;
563 cp = mp->tx_cmds + NCMDS_TX * fill;
564 cp->req_count = cpu_to_le16(len);
565 cp->phy_addr = cpu_to_le32(virt_to_bus(skb->data));
566
567 np = mp->tx_cmds + NCMDS_TX * next;
568 out_le16(&np->command, DBDMA_STOP);
569
570 /* poke the tx dma channel */
571 spin_lock_irqsave(&mp->lock, flags);
572 mp->tx_fill = next;
573 if (!mp->tx_bad_runt && mp->tx_active < MAX_TX_ACTIVE) {
574 out_le16(&cp->xfer_status, 0);
575 out_le16(&cp->command, OUTPUT_LAST);
576 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
577 ++mp->tx_active;
578 mace_set_timeout(dev);
579 }
580 if (++next >= N_TX_RING)
581 next = 0;
582 if (next == mp->tx_empty)
583 netif_stop_queue(dev);
584 spin_unlock_irqrestore(&mp->lock, flags);
585
586 return NETDEV_TX_OK;
587}
588
589static void mace_set_multicast(struct net_device *dev)
590{
591 struct mace_data *mp = netdev_priv(dev);
592 volatile struct mace __iomem *mb = mp->mace;
593 int i;
594 u32 crc;
595 unsigned long flags;
596
597 spin_lock_irqsave(&mp->lock, flags);
598 mp->maccc &= ~PROM;
599 if (dev->flags & IFF_PROMISC) {
600 mp->maccc |= PROM;
601 } else {
602 unsigned char multicast_filter[8];
603 struct netdev_hw_addr *ha;
604
605 if (dev->flags & IFF_ALLMULTI) {
606 for (i = 0; i < 8; i++)
607 multicast_filter[i] = 0xff;
608 } else {
609 for (i = 0; i < 8; i++)
610 multicast_filter[i] = 0;
611 netdev_for_each_mc_addr(ha, dev) {
612 crc = ether_crc_le(6, ha->addr);
613 i = crc >> 26; /* bit number in multicast_filter */
614 multicast_filter[i >> 3] |= 1 << (i & 7);
615 }
616 }
617#if 0
618 printk("Multicast filter :");
619 for (i = 0; i < 8; i++)
620 printk("%02x ", multicast_filter[i]);
621 printk("\n");
622#endif
623
624 if (mp->chipid == BROKEN_ADDRCHG_REV)
625 out_8(&mb->iac, LOGADDR);
626 else {
627 out_8(&mb->iac, ADDRCHG | LOGADDR);
628 while ((in_8(&mb->iac) & ADDRCHG) != 0)
629 ;
630 }
631 for (i = 0; i < 8; ++i)
632 out_8(&mb->ladrf, multicast_filter[i]);
633 if (mp->chipid != BROKEN_ADDRCHG_REV)
634 out_8(&mb->iac, 0);
635 }
636 /* reset maccc */
637 out_8(&mb->maccc, mp->maccc);
638 spin_unlock_irqrestore(&mp->lock, flags);
639}
640
641static void mace_handle_misc_intrs(struct mace_data *mp, int intr, struct net_device *dev)
642{
643 volatile struct mace __iomem *mb = mp->mace;
644 static int mace_babbles, mace_jabbers;
645
646 if (intr & MPCO)
647 dev->stats.rx_missed_errors += 256;
648 dev->stats.rx_missed_errors += in_8(&mb->mpc); /* reading clears it */
649 if (intr & RNTPCO)
650 dev->stats.rx_length_errors += 256;
651 dev->stats.rx_length_errors += in_8(&mb->rntpc); /* reading clears it */
652 if (intr & CERR)
653 ++dev->stats.tx_heartbeat_errors;
654 if (intr & BABBLE)
655 if (mace_babbles++ < 4)
656 printk(KERN_DEBUG "mace: babbling transmitter\n");
657 if (intr & JABBER)
658 if (mace_jabbers++ < 4)
659 printk(KERN_DEBUG "mace: jabbering transceiver\n");
660}
661
662static irqreturn_t mace_interrupt(int irq, void *dev_id)
663{
664 struct net_device *dev = (struct net_device *) dev_id;
665 struct mace_data *mp = netdev_priv(dev);
666 volatile struct mace __iomem *mb = mp->mace;
667 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
668 volatile struct dbdma_cmd *cp;
669 int intr, fs, i, stat, x;
670 int xcount, dstat;
671 unsigned long flags;
672 /* static int mace_last_fs, mace_last_xcount; */
673
674 spin_lock_irqsave(&mp->lock, flags);
675 intr = in_8(&mb->ir); /* read interrupt register */
676 in_8(&mb->xmtrc); /* get retries */
677 mace_handle_misc_intrs(mp, intr, dev);
678
679 i = mp->tx_empty;
680 while (in_8(&mb->pr) & XMTSV) {
681 del_timer(&mp->tx_timeout);
682 mp->timeout_active = 0;
683 /*
684 * Clear any interrupt indication associated with this status
685 * word. This appears to unlatch any error indication from
686 * the DMA controller.
687 */
688 intr = in_8(&mb->ir);
689 if (intr != 0)
690 mace_handle_misc_intrs(mp, intr, dev);
691 if (mp->tx_bad_runt) {
692 fs = in_8(&mb->xmtfs);
693 mp->tx_bad_runt = 0;
694 out_8(&mb->xmtfc, AUTO_PAD_XMIT);
695 continue;
696 }
697 dstat = le32_to_cpu(td->status);
698 /* stop DMA controller */
699 out_le32(&td->control, RUN << 16);
700 /*
701 * xcount is the number of complete frames which have been
702 * written to the fifo but for which status has not been read.
703 */
704 xcount = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK;
705 if (xcount == 0 || (dstat & DEAD)) {
706 /*
707 * If a packet was aborted before the DMA controller has
708 * finished transferring it, it seems that there are 2 bytes
709 * which are stuck in some buffer somewhere. These will get
710 * transmitted as soon as we read the frame status (which
711 * reenables the transmit data transfer request). Turning
712 * off the DMA controller and/or resetting the MACE doesn't
713 * help. So we disable auto-padding and FCS transmission
714 * so the two bytes will only be a runt packet which should
715 * be ignored by other stations.
716 */
717 out_8(&mb->xmtfc, DXMTFCS);
718 }
719 fs = in_8(&mb->xmtfs);
720 if ((fs & XMTSV) == 0) {
721 printk(KERN_ERR "mace: xmtfs not valid! (fs=%x xc=%d ds=%x)\n",
722 fs, xcount, dstat);
723 mace_reset(dev);
724 /*
725 * XXX mace likes to hang the machine after a xmtfs error.
726 * This is hard to reproduce, resetting *may* help
727 */
728 }
729 cp = mp->tx_cmds + NCMDS_TX * i;
730 stat = le16_to_cpu(cp->xfer_status);
731 if ((fs & (UFLO|LCOL|LCAR|RTRY)) || (dstat & DEAD) || xcount == 0) {
732 /*
733 * Check whether there were in fact 2 bytes written to
734 * the transmit FIFO.
735 */
736 udelay(1);
737 x = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK;
738 if (x != 0) {
739 /* there were two bytes with an end-of-packet indication */
740 mp->tx_bad_runt = 1;
741 mace_set_timeout(dev);
742 } else {
743 /*
744 * Either there weren't the two bytes buffered up, or they
745 * didn't have an end-of-packet indication.
746 * We flush the transmit FIFO just in case (by setting the
747 * XMTFWU bit with the transmitter disabled).
748 */
749 out_8(&mb->maccc, in_8(&mb->maccc) & ~ENXMT);
750 out_8(&mb->fifocc, in_8(&mb->fifocc) | XMTFWU);
751 udelay(1);
752 out_8(&mb->maccc, in_8(&mb->maccc) | ENXMT);
753 out_8(&mb->xmtfc, AUTO_PAD_XMIT);
754 }
755 }
756 /* dma should have finished */
757 if (i == mp->tx_fill) {
758 printk(KERN_DEBUG "mace: tx ring ran out? (fs=%x xc=%d ds=%x)\n",
759 fs, xcount, dstat);
760 continue;
761 }
762 /* Update stats */
763 if (fs & (UFLO|LCOL|LCAR|RTRY)) {
764 ++dev->stats.tx_errors;
765 if (fs & LCAR)
766 ++dev->stats.tx_carrier_errors;
767 if (fs & (UFLO|LCOL|RTRY))
768 ++dev->stats.tx_aborted_errors;
769 } else {
770 dev->stats.tx_bytes += mp->tx_bufs[i]->len;
771 ++dev->stats.tx_packets;
772 }
773 dev_consume_skb_irq(mp->tx_bufs[i]);
774 --mp->tx_active;
775 if (++i >= N_TX_RING)
776 i = 0;
777#if 0
778 mace_last_fs = fs;
779 mace_last_xcount = xcount;
780#endif
781 }
782
783 if (i != mp->tx_empty) {
784 mp->tx_fullup = 0;
785 netif_wake_queue(dev);
786 }
787 mp->tx_empty = i;
788 i += mp->tx_active;
789 if (i >= N_TX_RING)
790 i -= N_TX_RING;
791 if (!mp->tx_bad_runt && i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE) {
792 do {
793 /* set up the next one */
794 cp = mp->tx_cmds + NCMDS_TX * i;
795 out_le16(&cp->xfer_status, 0);
796 out_le16(&cp->command, OUTPUT_LAST);
797 ++mp->tx_active;
798 if (++i >= N_TX_RING)
799 i = 0;
800 } while (i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE);
801 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
802 mace_set_timeout(dev);
803 }
804 spin_unlock_irqrestore(&mp->lock, flags);
805 return IRQ_HANDLED;
806}
807
808static void mace_tx_timeout(struct timer_list *t)
809{
810 struct mace_data *mp = from_timer(mp, t, tx_timeout);
811 struct net_device *dev = macio_get_drvdata(mp->mdev);
812 volatile struct mace __iomem *mb = mp->mace;
813 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
814 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
815 volatile struct dbdma_cmd *cp;
816 unsigned long flags;
817 int i;
818
819 spin_lock_irqsave(&mp->lock, flags);
820 mp->timeout_active = 0;
821 if (mp->tx_active == 0 && !mp->tx_bad_runt)
822 goto out;
823
824 /* update various counters */
825 mace_handle_misc_intrs(mp, in_8(&mb->ir), dev);
826
827 cp = mp->tx_cmds + NCMDS_TX * mp->tx_empty;
828
829 /* turn off both tx and rx and reset the chip */
830 out_8(&mb->maccc, 0);
831 printk(KERN_ERR "mace: transmit timeout - resetting\n");
832 dbdma_reset(td);
833 mace_reset(dev);
834
835 /* restart rx dma */
836 cp = bus_to_virt(le32_to_cpu(rd->cmdptr));
837 dbdma_reset(rd);
838 out_le16(&cp->xfer_status, 0);
839 out_le32(&rd->cmdptr, virt_to_bus(cp));
840 out_le32(&rd->control, (RUN << 16) | RUN);
841
842 /* fix up the transmit side */
843 i = mp->tx_empty;
844 mp->tx_active = 0;
845 ++dev->stats.tx_errors;
846 if (mp->tx_bad_runt) {
847 mp->tx_bad_runt = 0;
848 } else if (i != mp->tx_fill) {
849 dev_kfree_skb_irq(mp->tx_bufs[i]);
850 if (++i >= N_TX_RING)
851 i = 0;
852 mp->tx_empty = i;
853 }
854 mp->tx_fullup = 0;
855 netif_wake_queue(dev);
856 if (i != mp->tx_fill) {
857 cp = mp->tx_cmds + NCMDS_TX * i;
858 out_le16(&cp->xfer_status, 0);
859 out_le16(&cp->command, OUTPUT_LAST);
860 out_le32(&td->cmdptr, virt_to_bus(cp));
861 out_le32(&td->control, (RUN << 16) | RUN);
862 ++mp->tx_active;
863 mace_set_timeout(dev);
864 }
865
866 /* turn it back on */
867 out_8(&mb->imr, RCVINT);
868 out_8(&mb->maccc, mp->maccc);
869
870out:
871 spin_unlock_irqrestore(&mp->lock, flags);
872}
873
874static irqreturn_t mace_txdma_intr(int irq, void *dev_id)
875{
876 return IRQ_HANDLED;
877}
878
879static irqreturn_t mace_rxdma_intr(int irq, void *dev_id)
880{
881 struct net_device *dev = (struct net_device *) dev_id;
882 struct mace_data *mp = netdev_priv(dev);
883 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
884 volatile struct dbdma_cmd *cp, *np;
885 int i, nb, stat, next;
886 struct sk_buff *skb;
887 unsigned frame_status;
888 static int mace_lost_status;
889 unsigned char *data;
890 unsigned long flags;
891
892 spin_lock_irqsave(&mp->lock, flags);
893 for (i = mp->rx_empty; i != mp->rx_fill; ) {
894 cp = mp->rx_cmds + i;
895 stat = le16_to_cpu(cp->xfer_status);
896 if ((stat & ACTIVE) == 0) {
897 next = i + 1;
898 if (next >= N_RX_RING)
899 next = 0;
900 np = mp->rx_cmds + next;
901 if (next != mp->rx_fill &&
902 (le16_to_cpu(np->xfer_status) & ACTIVE) != 0) {
903 printk(KERN_DEBUG "mace: lost a status word\n");
904 ++mace_lost_status;
905 } else
906 break;
907 }
908 nb = le16_to_cpu(cp->req_count) - le16_to_cpu(cp->res_count);
909 out_le16(&cp->command, DBDMA_STOP);
910 /* got a packet, have a look at it */
911 skb = mp->rx_bufs[i];
912 if (!skb) {
913 ++dev->stats.rx_dropped;
914 } else if (nb > 8) {
915 data = skb->data;
916 frame_status = (data[nb-3] << 8) + data[nb-4];
917 if (frame_status & (RS_OFLO|RS_CLSN|RS_FRAMERR|RS_FCSERR)) {
918 ++dev->stats.rx_errors;
919 if (frame_status & RS_OFLO)
920 ++dev->stats.rx_over_errors;
921 if (frame_status & RS_FRAMERR)
922 ++dev->stats.rx_frame_errors;
923 if (frame_status & RS_FCSERR)
924 ++dev->stats.rx_crc_errors;
925 } else {
926 /* Mace feature AUTO_STRIP_RCV is on by default, dropping the
927 * FCS on frames with 802.3 headers. This means that Ethernet
928 * frames have 8 extra octets at the end, while 802.3 frames
929 * have only 4. We need to correctly account for this. */
930 if (*(unsigned short *)(data+12) < 1536) /* 802.3 header */
931 nb -= 4;
932 else /* Ethernet header; mace includes FCS */
933 nb -= 8;
934 skb_put(skb, nb);
935 skb->protocol = eth_type_trans(skb, dev);
936 dev->stats.rx_bytes += skb->len;
937 netif_rx(skb);
938 mp->rx_bufs[i] = NULL;
939 ++dev->stats.rx_packets;
940 }
941 } else {
942 ++dev->stats.rx_errors;
943 ++dev->stats.rx_length_errors;
944 }
945
946 /* advance to next */
947 if (++i >= N_RX_RING)
948 i = 0;
949 }
950 mp->rx_empty = i;
951
952 i = mp->rx_fill;
953 for (;;) {
954 next = i + 1;
955 if (next >= N_RX_RING)
956 next = 0;
957 if (next == mp->rx_empty)
958 break;
959 cp = mp->rx_cmds + i;
960 skb = mp->rx_bufs[i];
961 if (!skb) {
962 skb = netdev_alloc_skb(dev, RX_BUFLEN + 2);
963 if (skb) {
964 skb_reserve(skb, 2);
965 mp->rx_bufs[i] = skb;
966 }
967 }
968 cp->req_count = cpu_to_le16(RX_BUFLEN);
969 data = skb? skb->data: dummy_buf;
970 cp->phy_addr = cpu_to_le32(virt_to_bus(data));
971 out_le16(&cp->xfer_status, 0);
972 out_le16(&cp->command, INPUT_LAST + INTR_ALWAYS);
973#if 0
974 if ((le32_to_cpu(rd->status) & ACTIVE) != 0) {
975 out_le32(&rd->control, (PAUSE << 16) | PAUSE);
976 while ((in_le32(&rd->status) & ACTIVE) != 0)
977 ;
978 }
979#endif
980 i = next;
981 }
982 if (i != mp->rx_fill) {
983 out_le32(&rd->control, ((RUN|WAKE) << 16) | (RUN|WAKE));
984 mp->rx_fill = i;
985 }
986 spin_unlock_irqrestore(&mp->lock, flags);
987 return IRQ_HANDLED;
988}
989
990static const struct of_device_id mace_match[] =
991{
992 {
993 .name = "mace",
994 },
995 {},
996};
997MODULE_DEVICE_TABLE (of, mace_match);
998
999static struct macio_driver mace_driver =
1000{
1001 .driver = {
1002 .name = "mace",
1003 .owner = THIS_MODULE,
1004 .of_match_table = mace_match,
1005 },
1006 .probe = mace_probe,
1007 .remove = mace_remove,
1008};
1009
1010
1011static int __init mace_init(void)
1012{
1013 return macio_register_driver(&mace_driver);
1014}
1015
1016static void __exit mace_cleanup(void)
1017{
1018 macio_unregister_driver(&mace_driver);
1019
1020 kfree(dummy_buf);
1021 dummy_buf = NULL;
1022}
1023
1024MODULE_AUTHOR("Paul Mackerras");
1025MODULE_DESCRIPTION("PowerMac MACE driver.");
1026module_param(port_aaui, int, 0);
1027MODULE_PARM_DESC(port_aaui, "MACE uses AAUI port (0-1)");
1028MODULE_LICENSE("GPL");
1029
1030module_init(mace_init);
1031module_exit(mace_cleanup);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Network device driver for the MACE ethernet controller on
4 * Apple Powermacs. Assumes it's under a DBDMA controller.
5 *
6 * Copyright (C) 1996 Paul Mackerras.
7 */
8
9#include <linux/module.h>
10#include <linux/kernel.h>
11#include <linux/netdevice.h>
12#include <linux/etherdevice.h>
13#include <linux/delay.h>
14#include <linux/string.h>
15#include <linux/timer.h>
16#include <linux/init.h>
17#include <linux/interrupt.h>
18#include <linux/crc32.h>
19#include <linux/spinlock.h>
20#include <linux/bitrev.h>
21#include <linux/slab.h>
22#include <linux/pgtable.h>
23#include <asm/prom.h>
24#include <asm/dbdma.h>
25#include <asm/io.h>
26#include <asm/macio.h>
27
28#include "mace.h"
29
30static int port_aaui = -1;
31
32#define N_RX_RING 8
33#define N_TX_RING 6
34#define MAX_TX_ACTIVE 1
35#define NCMDS_TX 1 /* dma commands per element in tx ring */
36#define RX_BUFLEN (ETH_FRAME_LEN + 8)
37#define TX_TIMEOUT HZ /* 1 second */
38
39/* Chip rev needs workaround on HW & multicast addr change */
40#define BROKEN_ADDRCHG_REV 0x0941
41
42/* Bits in transmit DMA status */
43#define TX_DMA_ERR 0x80
44
45struct mace_data {
46 volatile struct mace __iomem *mace;
47 volatile struct dbdma_regs __iomem *tx_dma;
48 int tx_dma_intr;
49 volatile struct dbdma_regs __iomem *rx_dma;
50 int rx_dma_intr;
51 volatile struct dbdma_cmd *tx_cmds; /* xmit dma command list */
52 volatile struct dbdma_cmd *rx_cmds; /* recv dma command list */
53 struct sk_buff *rx_bufs[N_RX_RING];
54 int rx_fill;
55 int rx_empty;
56 struct sk_buff *tx_bufs[N_TX_RING];
57 int tx_fill;
58 int tx_empty;
59 unsigned char maccc;
60 unsigned char tx_fullup;
61 unsigned char tx_active;
62 unsigned char tx_bad_runt;
63 struct timer_list tx_timeout;
64 int timeout_active;
65 int port_aaui;
66 int chipid;
67 struct macio_dev *mdev;
68 spinlock_t lock;
69};
70
71/*
72 * Number of bytes of private data per MACE: allow enough for
73 * the rx and tx dma commands plus a branch dma command each,
74 * and another 16 bytes to allow us to align the dma command
75 * buffers on a 16 byte boundary.
76 */
77#define PRIV_BYTES (sizeof(struct mace_data) \
78 + (N_RX_RING + NCMDS_TX * N_TX_RING + 3) * sizeof(struct dbdma_cmd))
79
80static int mace_open(struct net_device *dev);
81static int mace_close(struct net_device *dev);
82static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev);
83static void mace_set_multicast(struct net_device *dev);
84static void mace_reset(struct net_device *dev);
85static int mace_set_address(struct net_device *dev, void *addr);
86static irqreturn_t mace_interrupt(int irq, void *dev_id);
87static irqreturn_t mace_txdma_intr(int irq, void *dev_id);
88static irqreturn_t mace_rxdma_intr(int irq, void *dev_id);
89static void mace_set_timeout(struct net_device *dev);
90static void mace_tx_timeout(struct timer_list *t);
91static inline void dbdma_reset(volatile struct dbdma_regs __iomem *dma);
92static inline void mace_clean_rings(struct mace_data *mp);
93static void __mace_set_address(struct net_device *dev, void *addr);
94
95/*
96 * If we can't get a skbuff when we need it, we use this area for DMA.
97 */
98static unsigned char *dummy_buf;
99
100static const struct net_device_ops mace_netdev_ops = {
101 .ndo_open = mace_open,
102 .ndo_stop = mace_close,
103 .ndo_start_xmit = mace_xmit_start,
104 .ndo_set_rx_mode = mace_set_multicast,
105 .ndo_set_mac_address = mace_set_address,
106 .ndo_validate_addr = eth_validate_addr,
107};
108
109static int mace_probe(struct macio_dev *mdev, const struct of_device_id *match)
110{
111 struct device_node *mace = macio_get_of_node(mdev);
112 struct net_device *dev;
113 struct mace_data *mp;
114 const unsigned char *addr;
115 int j, rev, rc = -EBUSY;
116
117 if (macio_resource_count(mdev) != 3 || macio_irq_count(mdev) != 3) {
118 printk(KERN_ERR "can't use MACE %pOF: need 3 addrs and 3 irqs\n",
119 mace);
120 return -ENODEV;
121 }
122
123 addr = of_get_property(mace, "mac-address", NULL);
124 if (addr == NULL) {
125 addr = of_get_property(mace, "local-mac-address", NULL);
126 if (addr == NULL) {
127 printk(KERN_ERR "Can't get mac-address for MACE %pOF\n",
128 mace);
129 return -ENODEV;
130 }
131 }
132
133 /*
134 * lazy allocate the driver-wide dummy buffer. (Note that we
135 * never have more than one MACE in the system anyway)
136 */
137 if (dummy_buf == NULL) {
138 dummy_buf = kmalloc(RX_BUFLEN+2, GFP_KERNEL);
139 if (dummy_buf == NULL)
140 return -ENOMEM;
141 }
142
143 if (macio_request_resources(mdev, "mace")) {
144 printk(KERN_ERR "MACE: can't request IO resources !\n");
145 return -EBUSY;
146 }
147
148 dev = alloc_etherdev(PRIV_BYTES);
149 if (!dev) {
150 rc = -ENOMEM;
151 goto err_release;
152 }
153 SET_NETDEV_DEV(dev, &mdev->ofdev.dev);
154
155 mp = netdev_priv(dev);
156 mp->mdev = mdev;
157 macio_set_drvdata(mdev, dev);
158
159 dev->base_addr = macio_resource_start(mdev, 0);
160 mp->mace = ioremap(dev->base_addr, 0x1000);
161 if (mp->mace == NULL) {
162 printk(KERN_ERR "MACE: can't map IO resources !\n");
163 rc = -ENOMEM;
164 goto err_free;
165 }
166 dev->irq = macio_irq(mdev, 0);
167
168 rev = addr[0] == 0 && addr[1] == 0xA0;
169 for (j = 0; j < 6; ++j) {
170 dev->dev_addr[j] = rev ? bitrev8(addr[j]): addr[j];
171 }
172 mp->chipid = (in_8(&mp->mace->chipid_hi) << 8) |
173 in_8(&mp->mace->chipid_lo);
174
175
176 mp = netdev_priv(dev);
177 mp->maccc = ENXMT | ENRCV;
178
179 mp->tx_dma = ioremap(macio_resource_start(mdev, 1), 0x1000);
180 if (mp->tx_dma == NULL) {
181 printk(KERN_ERR "MACE: can't map TX DMA resources !\n");
182 rc = -ENOMEM;
183 goto err_unmap_io;
184 }
185 mp->tx_dma_intr = macio_irq(mdev, 1);
186
187 mp->rx_dma = ioremap(macio_resource_start(mdev, 2), 0x1000);
188 if (mp->rx_dma == NULL) {
189 printk(KERN_ERR "MACE: can't map RX DMA resources !\n");
190 rc = -ENOMEM;
191 goto err_unmap_tx_dma;
192 }
193 mp->rx_dma_intr = macio_irq(mdev, 2);
194
195 mp->tx_cmds = (volatile struct dbdma_cmd *) DBDMA_ALIGN(mp + 1);
196 mp->rx_cmds = mp->tx_cmds + NCMDS_TX * N_TX_RING + 1;
197
198 memset((char *) mp->tx_cmds, 0,
199 (NCMDS_TX*N_TX_RING + N_RX_RING + 2) * sizeof(struct dbdma_cmd));
200 timer_setup(&mp->tx_timeout, mace_tx_timeout, 0);
201 spin_lock_init(&mp->lock);
202 mp->timeout_active = 0;
203
204 if (port_aaui >= 0)
205 mp->port_aaui = port_aaui;
206 else {
207 /* Apple Network Server uses the AAUI port */
208 if (of_machine_is_compatible("AAPL,ShinerESB"))
209 mp->port_aaui = 1;
210 else {
211#ifdef CONFIG_MACE_AAUI_PORT
212 mp->port_aaui = 1;
213#else
214 mp->port_aaui = 0;
215#endif
216 }
217 }
218
219 dev->netdev_ops = &mace_netdev_ops;
220
221 /*
222 * Most of what is below could be moved to mace_open()
223 */
224 mace_reset(dev);
225
226 rc = request_irq(dev->irq, mace_interrupt, 0, "MACE", dev);
227 if (rc) {
228 printk(KERN_ERR "MACE: can't get irq %d\n", dev->irq);
229 goto err_unmap_rx_dma;
230 }
231 rc = request_irq(mp->tx_dma_intr, mace_txdma_intr, 0, "MACE-txdma", dev);
232 if (rc) {
233 printk(KERN_ERR "MACE: can't get irq %d\n", mp->tx_dma_intr);
234 goto err_free_irq;
235 }
236 rc = request_irq(mp->rx_dma_intr, mace_rxdma_intr, 0, "MACE-rxdma", dev);
237 if (rc) {
238 printk(KERN_ERR "MACE: can't get irq %d\n", mp->rx_dma_intr);
239 goto err_free_tx_irq;
240 }
241
242 rc = register_netdev(dev);
243 if (rc) {
244 printk(KERN_ERR "MACE: Cannot register net device, aborting.\n");
245 goto err_free_rx_irq;
246 }
247
248 printk(KERN_INFO "%s: MACE at %pM, chip revision %d.%d\n",
249 dev->name, dev->dev_addr,
250 mp->chipid >> 8, mp->chipid & 0xff);
251
252 return 0;
253
254 err_free_rx_irq:
255 free_irq(macio_irq(mdev, 2), dev);
256 err_free_tx_irq:
257 free_irq(macio_irq(mdev, 1), dev);
258 err_free_irq:
259 free_irq(macio_irq(mdev, 0), dev);
260 err_unmap_rx_dma:
261 iounmap(mp->rx_dma);
262 err_unmap_tx_dma:
263 iounmap(mp->tx_dma);
264 err_unmap_io:
265 iounmap(mp->mace);
266 err_free:
267 free_netdev(dev);
268 err_release:
269 macio_release_resources(mdev);
270
271 return rc;
272}
273
274static int mace_remove(struct macio_dev *mdev)
275{
276 struct net_device *dev = macio_get_drvdata(mdev);
277 struct mace_data *mp;
278
279 BUG_ON(dev == NULL);
280
281 macio_set_drvdata(mdev, NULL);
282
283 mp = netdev_priv(dev);
284
285 unregister_netdev(dev);
286
287 free_irq(dev->irq, dev);
288 free_irq(mp->tx_dma_intr, dev);
289 free_irq(mp->rx_dma_intr, dev);
290
291 iounmap(mp->rx_dma);
292 iounmap(mp->tx_dma);
293 iounmap(mp->mace);
294
295 free_netdev(dev);
296
297 macio_release_resources(mdev);
298
299 return 0;
300}
301
302static void dbdma_reset(volatile struct dbdma_regs __iomem *dma)
303{
304 int i;
305
306 out_le32(&dma->control, (WAKE|FLUSH|PAUSE|RUN) << 16);
307
308 /*
309 * Yes this looks peculiar, but apparently it needs to be this
310 * way on some machines.
311 */
312 for (i = 200; i > 0; --i)
313 if (le32_to_cpu(dma->control) & RUN)
314 udelay(1);
315}
316
317static void mace_reset(struct net_device *dev)
318{
319 struct mace_data *mp = netdev_priv(dev);
320 volatile struct mace __iomem *mb = mp->mace;
321 int i;
322
323 /* soft-reset the chip */
324 i = 200;
325 while (--i) {
326 out_8(&mb->biucc, SWRST);
327 if (in_8(&mb->biucc) & SWRST) {
328 udelay(10);
329 continue;
330 }
331 break;
332 }
333 if (!i) {
334 printk(KERN_ERR "mace: cannot reset chip!\n");
335 return;
336 }
337
338 out_8(&mb->imr, 0xff); /* disable all intrs for now */
339 i = in_8(&mb->ir);
340 out_8(&mb->maccc, 0); /* turn off tx, rx */
341
342 out_8(&mb->biucc, XMTSP_64);
343 out_8(&mb->utr, RTRD);
344 out_8(&mb->fifocc, RCVFW_32 | XMTFW_16 | XMTFWU | RCVFWU | XMTBRST);
345 out_8(&mb->xmtfc, AUTO_PAD_XMIT); /* auto-pad short frames */
346 out_8(&mb->rcvfc, 0);
347
348 /* load up the hardware address */
349 __mace_set_address(dev, dev->dev_addr);
350
351 /* clear the multicast filter */
352 if (mp->chipid == BROKEN_ADDRCHG_REV)
353 out_8(&mb->iac, LOGADDR);
354 else {
355 out_8(&mb->iac, ADDRCHG | LOGADDR);
356 while ((in_8(&mb->iac) & ADDRCHG) != 0)
357 ;
358 }
359 for (i = 0; i < 8; ++i)
360 out_8(&mb->ladrf, 0);
361
362 /* done changing address */
363 if (mp->chipid != BROKEN_ADDRCHG_REV)
364 out_8(&mb->iac, 0);
365
366 if (mp->port_aaui)
367 out_8(&mb->plscc, PORTSEL_AUI + ENPLSIO);
368 else
369 out_8(&mb->plscc, PORTSEL_GPSI + ENPLSIO);
370}
371
372static void __mace_set_address(struct net_device *dev, void *addr)
373{
374 struct mace_data *mp = netdev_priv(dev);
375 volatile struct mace __iomem *mb = mp->mace;
376 unsigned char *p = addr;
377 int i;
378
379 /* load up the hardware address */
380 if (mp->chipid == BROKEN_ADDRCHG_REV)
381 out_8(&mb->iac, PHYADDR);
382 else {
383 out_8(&mb->iac, ADDRCHG | PHYADDR);
384 while ((in_8(&mb->iac) & ADDRCHG) != 0)
385 ;
386 }
387 for (i = 0; i < 6; ++i)
388 out_8(&mb->padr, dev->dev_addr[i] = p[i]);
389 if (mp->chipid != BROKEN_ADDRCHG_REV)
390 out_8(&mb->iac, 0);
391}
392
393static int mace_set_address(struct net_device *dev, void *addr)
394{
395 struct mace_data *mp = netdev_priv(dev);
396 volatile struct mace __iomem *mb = mp->mace;
397 unsigned long flags;
398
399 spin_lock_irqsave(&mp->lock, flags);
400
401 __mace_set_address(dev, addr);
402
403 /* note: setting ADDRCHG clears ENRCV */
404 out_8(&mb->maccc, mp->maccc);
405
406 spin_unlock_irqrestore(&mp->lock, flags);
407 return 0;
408}
409
410static inline void mace_clean_rings(struct mace_data *mp)
411{
412 int i;
413
414 /* free some skb's */
415 for (i = 0; i < N_RX_RING; ++i) {
416 if (mp->rx_bufs[i] != NULL) {
417 dev_kfree_skb(mp->rx_bufs[i]);
418 mp->rx_bufs[i] = NULL;
419 }
420 }
421 for (i = mp->tx_empty; i != mp->tx_fill; ) {
422 dev_kfree_skb(mp->tx_bufs[i]);
423 if (++i >= N_TX_RING)
424 i = 0;
425 }
426}
427
428static int mace_open(struct net_device *dev)
429{
430 struct mace_data *mp = netdev_priv(dev);
431 volatile struct mace __iomem *mb = mp->mace;
432 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
433 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
434 volatile struct dbdma_cmd *cp;
435 int i;
436 struct sk_buff *skb;
437 unsigned char *data;
438
439 /* reset the chip */
440 mace_reset(dev);
441
442 /* initialize list of sk_buffs for receiving and set up recv dma */
443 mace_clean_rings(mp);
444 memset((char *)mp->rx_cmds, 0, N_RX_RING * sizeof(struct dbdma_cmd));
445 cp = mp->rx_cmds;
446 for (i = 0; i < N_RX_RING - 1; ++i) {
447 skb = netdev_alloc_skb(dev, RX_BUFLEN + 2);
448 if (!skb) {
449 data = dummy_buf;
450 } else {
451 skb_reserve(skb, 2); /* so IP header lands on 4-byte bdry */
452 data = skb->data;
453 }
454 mp->rx_bufs[i] = skb;
455 cp->req_count = cpu_to_le16(RX_BUFLEN);
456 cp->command = cpu_to_le16(INPUT_LAST + INTR_ALWAYS);
457 cp->phy_addr = cpu_to_le32(virt_to_bus(data));
458 cp->xfer_status = 0;
459 ++cp;
460 }
461 mp->rx_bufs[i] = NULL;
462 cp->command = cpu_to_le16(DBDMA_STOP);
463 mp->rx_fill = i;
464 mp->rx_empty = 0;
465
466 /* Put a branch back to the beginning of the receive command list */
467 ++cp;
468 cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS);
469 cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->rx_cmds));
470
471 /* start rx dma */
472 out_le32(&rd->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
473 out_le32(&rd->cmdptr, virt_to_bus(mp->rx_cmds));
474 out_le32(&rd->control, (RUN << 16) | RUN);
475
476 /* put a branch at the end of the tx command list */
477 cp = mp->tx_cmds + NCMDS_TX * N_TX_RING;
478 cp->command = cpu_to_le16(DBDMA_NOP + BR_ALWAYS);
479 cp->cmd_dep = cpu_to_le32(virt_to_bus(mp->tx_cmds));
480
481 /* reset tx dma */
482 out_le32(&td->control, (RUN|PAUSE|FLUSH|WAKE) << 16);
483 out_le32(&td->cmdptr, virt_to_bus(mp->tx_cmds));
484 mp->tx_fill = 0;
485 mp->tx_empty = 0;
486 mp->tx_fullup = 0;
487 mp->tx_active = 0;
488 mp->tx_bad_runt = 0;
489
490 /* turn it on! */
491 out_8(&mb->maccc, mp->maccc);
492 /* enable all interrupts except receive interrupts */
493 out_8(&mb->imr, RCVINT);
494
495 return 0;
496}
497
498static int mace_close(struct net_device *dev)
499{
500 struct mace_data *mp = netdev_priv(dev);
501 volatile struct mace __iomem *mb = mp->mace;
502 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
503 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
504
505 /* disable rx and tx */
506 out_8(&mb->maccc, 0);
507 out_8(&mb->imr, 0xff); /* disable all intrs */
508
509 /* disable rx and tx dma */
510 rd->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
511 td->control = cpu_to_le32((RUN|PAUSE|FLUSH|WAKE) << 16); /* clear run bit */
512
513 mace_clean_rings(mp);
514
515 return 0;
516}
517
518static inline void mace_set_timeout(struct net_device *dev)
519{
520 struct mace_data *mp = netdev_priv(dev);
521
522 if (mp->timeout_active)
523 del_timer(&mp->tx_timeout);
524 mp->tx_timeout.expires = jiffies + TX_TIMEOUT;
525 add_timer(&mp->tx_timeout);
526 mp->timeout_active = 1;
527}
528
529static netdev_tx_t mace_xmit_start(struct sk_buff *skb, struct net_device *dev)
530{
531 struct mace_data *mp = netdev_priv(dev);
532 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
533 volatile struct dbdma_cmd *cp, *np;
534 unsigned long flags;
535 int fill, next, len;
536
537 /* see if there's a free slot in the tx ring */
538 spin_lock_irqsave(&mp->lock, flags);
539 fill = mp->tx_fill;
540 next = fill + 1;
541 if (next >= N_TX_RING)
542 next = 0;
543 if (next == mp->tx_empty) {
544 netif_stop_queue(dev);
545 mp->tx_fullup = 1;
546 spin_unlock_irqrestore(&mp->lock, flags);
547 return NETDEV_TX_BUSY; /* can't take it at the moment */
548 }
549 spin_unlock_irqrestore(&mp->lock, flags);
550
551 /* partially fill in the dma command block */
552 len = skb->len;
553 if (len > ETH_FRAME_LEN) {
554 printk(KERN_DEBUG "mace: xmit frame too long (%d)\n", len);
555 len = ETH_FRAME_LEN;
556 }
557 mp->tx_bufs[fill] = skb;
558 cp = mp->tx_cmds + NCMDS_TX * fill;
559 cp->req_count = cpu_to_le16(len);
560 cp->phy_addr = cpu_to_le32(virt_to_bus(skb->data));
561
562 np = mp->tx_cmds + NCMDS_TX * next;
563 out_le16(&np->command, DBDMA_STOP);
564
565 /* poke the tx dma channel */
566 spin_lock_irqsave(&mp->lock, flags);
567 mp->tx_fill = next;
568 if (!mp->tx_bad_runt && mp->tx_active < MAX_TX_ACTIVE) {
569 out_le16(&cp->xfer_status, 0);
570 out_le16(&cp->command, OUTPUT_LAST);
571 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
572 ++mp->tx_active;
573 mace_set_timeout(dev);
574 }
575 if (++next >= N_TX_RING)
576 next = 0;
577 if (next == mp->tx_empty)
578 netif_stop_queue(dev);
579 spin_unlock_irqrestore(&mp->lock, flags);
580
581 return NETDEV_TX_OK;
582}
583
584static void mace_set_multicast(struct net_device *dev)
585{
586 struct mace_data *mp = netdev_priv(dev);
587 volatile struct mace __iomem *mb = mp->mace;
588 int i;
589 u32 crc;
590 unsigned long flags;
591
592 spin_lock_irqsave(&mp->lock, flags);
593 mp->maccc &= ~PROM;
594 if (dev->flags & IFF_PROMISC) {
595 mp->maccc |= PROM;
596 } else {
597 unsigned char multicast_filter[8];
598 struct netdev_hw_addr *ha;
599
600 if (dev->flags & IFF_ALLMULTI) {
601 for (i = 0; i < 8; i++)
602 multicast_filter[i] = 0xff;
603 } else {
604 for (i = 0; i < 8; i++)
605 multicast_filter[i] = 0;
606 netdev_for_each_mc_addr(ha, dev) {
607 crc = ether_crc_le(6, ha->addr);
608 i = crc >> 26; /* bit number in multicast_filter */
609 multicast_filter[i >> 3] |= 1 << (i & 7);
610 }
611 }
612#if 0
613 printk("Multicast filter :");
614 for (i = 0; i < 8; i++)
615 printk("%02x ", multicast_filter[i]);
616 printk("\n");
617#endif
618
619 if (mp->chipid == BROKEN_ADDRCHG_REV)
620 out_8(&mb->iac, LOGADDR);
621 else {
622 out_8(&mb->iac, ADDRCHG | LOGADDR);
623 while ((in_8(&mb->iac) & ADDRCHG) != 0)
624 ;
625 }
626 for (i = 0; i < 8; ++i)
627 out_8(&mb->ladrf, multicast_filter[i]);
628 if (mp->chipid != BROKEN_ADDRCHG_REV)
629 out_8(&mb->iac, 0);
630 }
631 /* reset maccc */
632 out_8(&mb->maccc, mp->maccc);
633 spin_unlock_irqrestore(&mp->lock, flags);
634}
635
636static void mace_handle_misc_intrs(struct mace_data *mp, int intr, struct net_device *dev)
637{
638 volatile struct mace __iomem *mb = mp->mace;
639 static int mace_babbles, mace_jabbers;
640
641 if (intr & MPCO)
642 dev->stats.rx_missed_errors += 256;
643 dev->stats.rx_missed_errors += in_8(&mb->mpc); /* reading clears it */
644 if (intr & RNTPCO)
645 dev->stats.rx_length_errors += 256;
646 dev->stats.rx_length_errors += in_8(&mb->rntpc); /* reading clears it */
647 if (intr & CERR)
648 ++dev->stats.tx_heartbeat_errors;
649 if (intr & BABBLE)
650 if (mace_babbles++ < 4)
651 printk(KERN_DEBUG "mace: babbling transmitter\n");
652 if (intr & JABBER)
653 if (mace_jabbers++ < 4)
654 printk(KERN_DEBUG "mace: jabbering transceiver\n");
655}
656
657static irqreturn_t mace_interrupt(int irq, void *dev_id)
658{
659 struct net_device *dev = (struct net_device *) dev_id;
660 struct mace_data *mp = netdev_priv(dev);
661 volatile struct mace __iomem *mb = mp->mace;
662 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
663 volatile struct dbdma_cmd *cp;
664 int intr, fs, i, stat, x;
665 int xcount, dstat;
666 unsigned long flags;
667 /* static int mace_last_fs, mace_last_xcount; */
668
669 spin_lock_irqsave(&mp->lock, flags);
670 intr = in_8(&mb->ir); /* read interrupt register */
671 in_8(&mb->xmtrc); /* get retries */
672 mace_handle_misc_intrs(mp, intr, dev);
673
674 i = mp->tx_empty;
675 while (in_8(&mb->pr) & XMTSV) {
676 del_timer(&mp->tx_timeout);
677 mp->timeout_active = 0;
678 /*
679 * Clear any interrupt indication associated with this status
680 * word. This appears to unlatch any error indication from
681 * the DMA controller.
682 */
683 intr = in_8(&mb->ir);
684 if (intr != 0)
685 mace_handle_misc_intrs(mp, intr, dev);
686 if (mp->tx_bad_runt) {
687 fs = in_8(&mb->xmtfs);
688 mp->tx_bad_runt = 0;
689 out_8(&mb->xmtfc, AUTO_PAD_XMIT);
690 continue;
691 }
692 dstat = le32_to_cpu(td->status);
693 /* stop DMA controller */
694 out_le32(&td->control, RUN << 16);
695 /*
696 * xcount is the number of complete frames which have been
697 * written to the fifo but for which status has not been read.
698 */
699 xcount = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK;
700 if (xcount == 0 || (dstat & DEAD)) {
701 /*
702 * If a packet was aborted before the DMA controller has
703 * finished transferring it, it seems that there are 2 bytes
704 * which are stuck in some buffer somewhere. These will get
705 * transmitted as soon as we read the frame status (which
706 * reenables the transmit data transfer request). Turning
707 * off the DMA controller and/or resetting the MACE doesn't
708 * help. So we disable auto-padding and FCS transmission
709 * so the two bytes will only be a runt packet which should
710 * be ignored by other stations.
711 */
712 out_8(&mb->xmtfc, DXMTFCS);
713 }
714 fs = in_8(&mb->xmtfs);
715 if ((fs & XMTSV) == 0) {
716 printk(KERN_ERR "mace: xmtfs not valid! (fs=%x xc=%d ds=%x)\n",
717 fs, xcount, dstat);
718 mace_reset(dev);
719 /*
720 * XXX mace likes to hang the machine after a xmtfs error.
721 * This is hard to reproduce, resetting *may* help
722 */
723 }
724 cp = mp->tx_cmds + NCMDS_TX * i;
725 stat = le16_to_cpu(cp->xfer_status);
726 if ((fs & (UFLO|LCOL|LCAR|RTRY)) || (dstat & DEAD) || xcount == 0) {
727 /*
728 * Check whether there were in fact 2 bytes written to
729 * the transmit FIFO.
730 */
731 udelay(1);
732 x = (in_8(&mb->fifofc) >> XMTFC_SH) & XMTFC_MASK;
733 if (x != 0) {
734 /* there were two bytes with an end-of-packet indication */
735 mp->tx_bad_runt = 1;
736 mace_set_timeout(dev);
737 } else {
738 /*
739 * Either there weren't the two bytes buffered up, or they
740 * didn't have an end-of-packet indication.
741 * We flush the transmit FIFO just in case (by setting the
742 * XMTFWU bit with the transmitter disabled).
743 */
744 out_8(&mb->maccc, in_8(&mb->maccc) & ~ENXMT);
745 out_8(&mb->fifocc, in_8(&mb->fifocc) | XMTFWU);
746 udelay(1);
747 out_8(&mb->maccc, in_8(&mb->maccc) | ENXMT);
748 out_8(&mb->xmtfc, AUTO_PAD_XMIT);
749 }
750 }
751 /* dma should have finished */
752 if (i == mp->tx_fill) {
753 printk(KERN_DEBUG "mace: tx ring ran out? (fs=%x xc=%d ds=%x)\n",
754 fs, xcount, dstat);
755 continue;
756 }
757 /* Update stats */
758 if (fs & (UFLO|LCOL|LCAR|RTRY)) {
759 ++dev->stats.tx_errors;
760 if (fs & LCAR)
761 ++dev->stats.tx_carrier_errors;
762 if (fs & (UFLO|LCOL|RTRY))
763 ++dev->stats.tx_aborted_errors;
764 } else {
765 dev->stats.tx_bytes += mp->tx_bufs[i]->len;
766 ++dev->stats.tx_packets;
767 }
768 dev_consume_skb_irq(mp->tx_bufs[i]);
769 --mp->tx_active;
770 if (++i >= N_TX_RING)
771 i = 0;
772#if 0
773 mace_last_fs = fs;
774 mace_last_xcount = xcount;
775#endif
776 }
777
778 if (i != mp->tx_empty) {
779 mp->tx_fullup = 0;
780 netif_wake_queue(dev);
781 }
782 mp->tx_empty = i;
783 i += mp->tx_active;
784 if (i >= N_TX_RING)
785 i -= N_TX_RING;
786 if (!mp->tx_bad_runt && i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE) {
787 do {
788 /* set up the next one */
789 cp = mp->tx_cmds + NCMDS_TX * i;
790 out_le16(&cp->xfer_status, 0);
791 out_le16(&cp->command, OUTPUT_LAST);
792 ++mp->tx_active;
793 if (++i >= N_TX_RING)
794 i = 0;
795 } while (i != mp->tx_fill && mp->tx_active < MAX_TX_ACTIVE);
796 out_le32(&td->control, ((RUN|WAKE) << 16) + (RUN|WAKE));
797 mace_set_timeout(dev);
798 }
799 spin_unlock_irqrestore(&mp->lock, flags);
800 return IRQ_HANDLED;
801}
802
803static void mace_tx_timeout(struct timer_list *t)
804{
805 struct mace_data *mp = from_timer(mp, t, tx_timeout);
806 struct net_device *dev = macio_get_drvdata(mp->mdev);
807 volatile struct mace __iomem *mb = mp->mace;
808 volatile struct dbdma_regs __iomem *td = mp->tx_dma;
809 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
810 volatile struct dbdma_cmd *cp;
811 unsigned long flags;
812 int i;
813
814 spin_lock_irqsave(&mp->lock, flags);
815 mp->timeout_active = 0;
816 if (mp->tx_active == 0 && !mp->tx_bad_runt)
817 goto out;
818
819 /* update various counters */
820 mace_handle_misc_intrs(mp, in_8(&mb->ir), dev);
821
822 cp = mp->tx_cmds + NCMDS_TX * mp->tx_empty;
823
824 /* turn off both tx and rx and reset the chip */
825 out_8(&mb->maccc, 0);
826 printk(KERN_ERR "mace: transmit timeout - resetting\n");
827 dbdma_reset(td);
828 mace_reset(dev);
829
830 /* restart rx dma */
831 cp = bus_to_virt(le32_to_cpu(rd->cmdptr));
832 dbdma_reset(rd);
833 out_le16(&cp->xfer_status, 0);
834 out_le32(&rd->cmdptr, virt_to_bus(cp));
835 out_le32(&rd->control, (RUN << 16) | RUN);
836
837 /* fix up the transmit side */
838 i = mp->tx_empty;
839 mp->tx_active = 0;
840 ++dev->stats.tx_errors;
841 if (mp->tx_bad_runt) {
842 mp->tx_bad_runt = 0;
843 } else if (i != mp->tx_fill) {
844 dev_kfree_skb(mp->tx_bufs[i]);
845 if (++i >= N_TX_RING)
846 i = 0;
847 mp->tx_empty = i;
848 }
849 mp->tx_fullup = 0;
850 netif_wake_queue(dev);
851 if (i != mp->tx_fill) {
852 cp = mp->tx_cmds + NCMDS_TX * i;
853 out_le16(&cp->xfer_status, 0);
854 out_le16(&cp->command, OUTPUT_LAST);
855 out_le32(&td->cmdptr, virt_to_bus(cp));
856 out_le32(&td->control, (RUN << 16) | RUN);
857 ++mp->tx_active;
858 mace_set_timeout(dev);
859 }
860
861 /* turn it back on */
862 out_8(&mb->imr, RCVINT);
863 out_8(&mb->maccc, mp->maccc);
864
865out:
866 spin_unlock_irqrestore(&mp->lock, flags);
867}
868
869static irqreturn_t mace_txdma_intr(int irq, void *dev_id)
870{
871 return IRQ_HANDLED;
872}
873
874static irqreturn_t mace_rxdma_intr(int irq, void *dev_id)
875{
876 struct net_device *dev = (struct net_device *) dev_id;
877 struct mace_data *mp = netdev_priv(dev);
878 volatile struct dbdma_regs __iomem *rd = mp->rx_dma;
879 volatile struct dbdma_cmd *cp, *np;
880 int i, nb, stat, next;
881 struct sk_buff *skb;
882 unsigned frame_status;
883 static int mace_lost_status;
884 unsigned char *data;
885 unsigned long flags;
886
887 spin_lock_irqsave(&mp->lock, flags);
888 for (i = mp->rx_empty; i != mp->rx_fill; ) {
889 cp = mp->rx_cmds + i;
890 stat = le16_to_cpu(cp->xfer_status);
891 if ((stat & ACTIVE) == 0) {
892 next = i + 1;
893 if (next >= N_RX_RING)
894 next = 0;
895 np = mp->rx_cmds + next;
896 if (next != mp->rx_fill &&
897 (le16_to_cpu(np->xfer_status) & ACTIVE) != 0) {
898 printk(KERN_DEBUG "mace: lost a status word\n");
899 ++mace_lost_status;
900 } else
901 break;
902 }
903 nb = le16_to_cpu(cp->req_count) - le16_to_cpu(cp->res_count);
904 out_le16(&cp->command, DBDMA_STOP);
905 /* got a packet, have a look at it */
906 skb = mp->rx_bufs[i];
907 if (!skb) {
908 ++dev->stats.rx_dropped;
909 } else if (nb > 8) {
910 data = skb->data;
911 frame_status = (data[nb-3] << 8) + data[nb-4];
912 if (frame_status & (RS_OFLO|RS_CLSN|RS_FRAMERR|RS_FCSERR)) {
913 ++dev->stats.rx_errors;
914 if (frame_status & RS_OFLO)
915 ++dev->stats.rx_over_errors;
916 if (frame_status & RS_FRAMERR)
917 ++dev->stats.rx_frame_errors;
918 if (frame_status & RS_FCSERR)
919 ++dev->stats.rx_crc_errors;
920 } else {
921 /* Mace feature AUTO_STRIP_RCV is on by default, dropping the
922 * FCS on frames with 802.3 headers. This means that Ethernet
923 * frames have 8 extra octets at the end, while 802.3 frames
924 * have only 4. We need to correctly account for this. */
925 if (*(unsigned short *)(data+12) < 1536) /* 802.3 header */
926 nb -= 4;
927 else /* Ethernet header; mace includes FCS */
928 nb -= 8;
929 skb_put(skb, nb);
930 skb->protocol = eth_type_trans(skb, dev);
931 dev->stats.rx_bytes += skb->len;
932 netif_rx(skb);
933 mp->rx_bufs[i] = NULL;
934 ++dev->stats.rx_packets;
935 }
936 } else {
937 ++dev->stats.rx_errors;
938 ++dev->stats.rx_length_errors;
939 }
940
941 /* advance to next */
942 if (++i >= N_RX_RING)
943 i = 0;
944 }
945 mp->rx_empty = i;
946
947 i = mp->rx_fill;
948 for (;;) {
949 next = i + 1;
950 if (next >= N_RX_RING)
951 next = 0;
952 if (next == mp->rx_empty)
953 break;
954 cp = mp->rx_cmds + i;
955 skb = mp->rx_bufs[i];
956 if (!skb) {
957 skb = netdev_alloc_skb(dev, RX_BUFLEN + 2);
958 if (skb) {
959 skb_reserve(skb, 2);
960 mp->rx_bufs[i] = skb;
961 }
962 }
963 cp->req_count = cpu_to_le16(RX_BUFLEN);
964 data = skb? skb->data: dummy_buf;
965 cp->phy_addr = cpu_to_le32(virt_to_bus(data));
966 out_le16(&cp->xfer_status, 0);
967 out_le16(&cp->command, INPUT_LAST + INTR_ALWAYS);
968#if 0
969 if ((le32_to_cpu(rd->status) & ACTIVE) != 0) {
970 out_le32(&rd->control, (PAUSE << 16) | PAUSE);
971 while ((in_le32(&rd->status) & ACTIVE) != 0)
972 ;
973 }
974#endif
975 i = next;
976 }
977 if (i != mp->rx_fill) {
978 out_le32(&rd->control, ((RUN|WAKE) << 16) | (RUN|WAKE));
979 mp->rx_fill = i;
980 }
981 spin_unlock_irqrestore(&mp->lock, flags);
982 return IRQ_HANDLED;
983}
984
985static const struct of_device_id mace_match[] =
986{
987 {
988 .name = "mace",
989 },
990 {},
991};
992MODULE_DEVICE_TABLE (of, mace_match);
993
994static struct macio_driver mace_driver =
995{
996 .driver = {
997 .name = "mace",
998 .owner = THIS_MODULE,
999 .of_match_table = mace_match,
1000 },
1001 .probe = mace_probe,
1002 .remove = mace_remove,
1003};
1004
1005
1006static int __init mace_init(void)
1007{
1008 return macio_register_driver(&mace_driver);
1009}
1010
1011static void __exit mace_cleanup(void)
1012{
1013 macio_unregister_driver(&mace_driver);
1014
1015 kfree(dummy_buf);
1016 dummy_buf = NULL;
1017}
1018
1019MODULE_AUTHOR("Paul Mackerras");
1020MODULE_DESCRIPTION("PowerMac MACE driver.");
1021module_param(port_aaui, int, 0);
1022MODULE_PARM_DESC(port_aaui, "MACE uses AAUI port (0-1)");
1023MODULE_LICENSE("GPL");
1024
1025module_init(mace_init);
1026module_exit(mace_cleanup);