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Merge branch 'devel' of master.kernel.org:/home/rmk/linux-2.6-mmc
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / net / sunqe.c
blob817a40b66638a2c268060dbd2cf0e54539b6bf91
1 /* sunqe.c: Sparc QuadEthernet 10baseT SBUS card driver.
2 * Once again I am out to prove that every ethernet
3 * controller out there can be most efficiently programmed
4 * if you make it look like a LANCE.
5 *
6 * Copyright (C) 1996, 1999, 2003, 2006 David S. Miller (davem@davemloft.net)
7 */
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/types.h>
12 #include <linux/errno.h>
13 #include <linux/fcntl.h>
14 #include <linux/interrupt.h>
15 #include <linux/ioport.h>
16 #include <linux/in.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/delay.h>
20 #include <linux/init.h>
21 #include <linux/crc32.h>
22 #include <linux/netdevice.h>
23 #include <linux/etherdevice.h>
24 #include <linux/skbuff.h>
25 #include <linux/ethtool.h>
26 #include <linux/bitops.h>
27
28 #include <asm/system.h>
29 #include <asm/io.h>
30 #include <asm/dma.h>
31 #include <asm/byteorder.h>
32 #include <asm/idprom.h>
33 #include <asm/sbus.h>
34 #include <asm/openprom.h>
35 #include <asm/oplib.h>
36 #include <asm/auxio.h>
37 #include <asm/pgtable.h>
38 #include <asm/irq.h>
39
40 #include "sunqe.h"
41
42 #define DRV_NAME "sunqe"
43 #define DRV_VERSION "4.0"
44 #define DRV_RELDATE "June 23, 2006"
45 #define DRV_AUTHOR "David S. Miller (davem@davemloft.net)"
46
47 static char version[] =
48 DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " " DRV_AUTHOR "\n";
49
50 MODULE_VERSION(DRV_VERSION);
51 MODULE_AUTHOR(DRV_AUTHOR);
52 MODULE_DESCRIPTION("Sun QuadEthernet 10baseT SBUS card driver");
53 MODULE_LICENSE("GPL");
54
55 static struct sunqec *root_qec_dev;
56
57 static void qe_set_multicast(struct net_device *dev);
58
59 #define QEC_RESET_TRIES 200
60
61 static inline int qec_global_reset(void __iomem *gregs)
62 {
63 int tries = QEC_RESET_TRIES;
64
65 sbus_writel(GLOB_CTRL_RESET, gregs + GLOB_CTRL);
66 while (--tries) {
67 u32 tmp = sbus_readl(gregs + GLOB_CTRL);
68 if (tmp & GLOB_CTRL_RESET) {
69 udelay(20);
70 continue;
71 }
72 break;
73 }
74 if (tries)
75 return 0;
76 printk(KERN_ERR "QuadEther: AIEEE cannot reset the QEC!\n");
77 return -1;
78 }
79
80 #define MACE_RESET_RETRIES 200
81 #define QE_RESET_RETRIES 200
82
83 static inline int qe_stop(struct sunqe *qep)
84 {
85 void __iomem *cregs = qep->qcregs;
86 void __iomem *mregs = qep->mregs;
87 int tries;
88
89 /* Reset the MACE, then the QEC channel. */
90 sbus_writeb(MREGS_BCONFIG_RESET, mregs + MREGS_BCONFIG);
91 tries = MACE_RESET_RETRIES;
92 while (--tries) {
93 u8 tmp = sbus_readb(mregs + MREGS_BCONFIG);
94 if (tmp & MREGS_BCONFIG_RESET) {
95 udelay(20);
96 continue;
97 }
98 break;
99 }
100 if (!tries) {
101 printk(KERN_ERR "QuadEther: AIEEE cannot reset the MACE!\n");
102 return -1;
103 }
104
105 sbus_writel(CREG_CTRL_RESET, cregs + CREG_CTRL);
106 tries = QE_RESET_RETRIES;
107 while (--tries) {
108 u32 tmp = sbus_readl(cregs + CREG_CTRL);
109 if (tmp & CREG_CTRL_RESET) {
110 udelay(20);
111 continue;
112 }
113 break;
114 }
115 if (!tries) {
116 printk(KERN_ERR "QuadEther: Cannot reset QE channel!\n");
117 return -1;
118 }
119 return 0;
120 }
121
122 static void qe_init_rings(struct sunqe *qep)
123 {
124 struct qe_init_block *qb = qep->qe_block;
125 struct sunqe_buffers *qbufs = qep->buffers;
126 __u32 qbufs_dvma = qep->buffers_dvma;
127 int i;
128
129 qep->rx_new = qep->rx_old = qep->tx_new = qep->tx_old = 0;
130 memset(qb, 0, sizeof(struct qe_init_block));
131 memset(qbufs, 0, sizeof(struct sunqe_buffers));
132 for (i = 0; i < RX_RING_SIZE; i++) {
133 qb->qe_rxd[i].rx_addr = qbufs_dvma + qebuf_offset(rx_buf, i);
134 qb->qe_rxd[i].rx_flags =
135 (RXD_OWN | ((RXD_PKT_SZ) & RXD_LENGTH));
136 }
137 }
138
139 static int qe_init(struct sunqe *qep, int from_irq)
140 {
141 struct sunqec *qecp = qep->parent;
142 void __iomem *cregs = qep->qcregs;
143 void __iomem *mregs = qep->mregs;
144 void __iomem *gregs = qecp->gregs;
145 unsigned char *e = &qep->dev->dev_addr[0];
146 u32 tmp;
147 int i;
148
149 /* Shut it up. */
150 if (qe_stop(qep))
151 return -EAGAIN;
152
153 /* Setup initial rx/tx init block pointers. */
154 sbus_writel(qep->qblock_dvma + qib_offset(qe_rxd, 0), cregs + CREG_RXDS);
155 sbus_writel(qep->qblock_dvma + qib_offset(qe_txd, 0), cregs + CREG_TXDS);
156
157 /* Enable/mask the various irq's. */
158 sbus_writel(0, cregs + CREG_RIMASK);
159 sbus_writel(1, cregs + CREG_TIMASK);
160
161 sbus_writel(0, cregs + CREG_QMASK);
162 sbus_writel(CREG_MMASK_RXCOLL, cregs + CREG_MMASK);
163
164 /* Setup the FIFO pointers into QEC local memory. */
165 tmp = qep->channel * sbus_readl(gregs + GLOB_MSIZE);
166 sbus_writel(tmp, cregs + CREG_RXRBUFPTR);
167 sbus_writel(tmp, cregs + CREG_RXWBUFPTR);
168
169 tmp = sbus_readl(cregs + CREG_RXRBUFPTR) +
170 sbus_readl(gregs + GLOB_RSIZE);
171 sbus_writel(tmp, cregs + CREG_TXRBUFPTR);
172 sbus_writel(tmp, cregs + CREG_TXWBUFPTR);
173
174 /* Clear the channel collision counter. */
175 sbus_writel(0, cregs + CREG_CCNT);
176
177 /* For 10baseT, inter frame space nor throttle seems to be necessary. */
178 sbus_writel(0, cregs + CREG_PIPG);
179
180 /* Now dork with the AMD MACE. */
181 sbus_writeb(MREGS_PHYCONFIG_AUTO, mregs + MREGS_PHYCONFIG);
182 sbus_writeb(MREGS_TXFCNTL_AUTOPAD, mregs + MREGS_TXFCNTL);
183 sbus_writeb(0, mregs + MREGS_RXFCNTL);
184
185 /* The QEC dma's the rx'd packets from local memory out to main memory,
186 * and therefore it interrupts when the packet reception is "complete".
187 * So don't listen for the MACE talking about it.
188 */
189 sbus_writeb(MREGS_IMASK_COLL | MREGS_IMASK_RXIRQ, mregs + MREGS_IMASK);
190 sbus_writeb(MREGS_BCONFIG_BSWAP | MREGS_BCONFIG_64TS, mregs + MREGS_BCONFIG);
191 sbus_writeb((MREGS_FCONFIG_TXF16 | MREGS_FCONFIG_RXF32 |
192 MREGS_FCONFIG_RFWU | MREGS_FCONFIG_TFWU),
193 mregs + MREGS_FCONFIG);
194
195 /* Only usable interface on QuadEther is twisted pair. */
196 sbus_writeb(MREGS_PLSCONFIG_TP, mregs + MREGS_PLSCONFIG);
197
198 /* Tell MACE we are changing the ether address. */
199 sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_PARESET,
200 mregs + MREGS_IACONFIG);
201 while ((sbus_readb(mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
202 barrier();
203 sbus_writeb(e[0], mregs + MREGS_ETHADDR);
204 sbus_writeb(e[1], mregs + MREGS_ETHADDR);
205 sbus_writeb(e[2], mregs + MREGS_ETHADDR);
206 sbus_writeb(e[3], mregs + MREGS_ETHADDR);
207 sbus_writeb(e[4], mregs + MREGS_ETHADDR);
208 sbus_writeb(e[5], mregs + MREGS_ETHADDR);
209
210 /* Clear out the address filter. */
211 sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_LARESET,
212 mregs + MREGS_IACONFIG);
213 while ((sbus_readb(mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
214 barrier();
215 for (i = 0; i < 8; i++)
216 sbus_writeb(0, mregs + MREGS_FILTER);
217
218 /* Address changes are now complete. */
219 sbus_writeb(0, mregs + MREGS_IACONFIG);
220
221 qe_init_rings(qep);
222
223 /* Wait a little bit for the link to come up... */
224 mdelay(5);
225 if (!(sbus_readb(mregs + MREGS_PHYCONFIG) & MREGS_PHYCONFIG_LTESTDIS)) {
226 int tries = 50;
227
228 while (tries--) {
229 u8 tmp;
230
231 mdelay(5);
232 barrier();
233 tmp = sbus_readb(mregs + MREGS_PHYCONFIG);
234 if ((tmp & MREGS_PHYCONFIG_LSTAT) != 0)
235 break;
236 }
237 if (tries == 0)
238 printk(KERN_NOTICE "%s: Warning, link state is down.\n", qep->dev->name);
239 }
240
241 /* Missed packet counter is cleared on a read. */
242 sbus_readb(mregs + MREGS_MPCNT);
243
244 /* Reload multicast information, this will enable the receiver
245 * and transmitter.
246 */
247 qe_set_multicast(qep->dev);
248
249 /* QEC should now start to show interrupts. */
250 return 0;
251 }
252
253 /* Grrr, certain error conditions completely lock up the AMD MACE,
254 * so when we get these we _must_ reset the chip.
255 */
256 static int qe_is_bolixed(struct sunqe *qep, u32 qe_status)
257 {
258 struct net_device *dev = qep->dev;
259 int mace_hwbug_workaround = 0;
260
261 if (qe_status & CREG_STAT_EDEFER) {
262 printk(KERN_ERR "%s: Excessive transmit defers.\n", dev->name);
263 qep->net_stats.tx_errors++;
264 }
265
266 if (qe_status & CREG_STAT_CLOSS) {
267 printk(KERN_ERR "%s: Carrier lost, link down?\n", dev->name);
268 qep->net_stats.tx_errors++;
269 qep->net_stats.tx_carrier_errors++;
270 }
271
272 if (qe_status & CREG_STAT_ERETRIES) {
273 printk(KERN_ERR "%s: Excessive transmit retries (more than 16).\n", dev->name);
274 qep->net_stats.tx_errors++;
275 mace_hwbug_workaround = 1;
276 }
277
278 if (qe_status & CREG_STAT_LCOLL) {
279 printk(KERN_ERR "%s: Late transmit collision.\n", dev->name);
280 qep->net_stats.tx_errors++;
281 qep->net_stats.collisions++;
282 mace_hwbug_workaround = 1;
283 }
284
285 if (qe_status & CREG_STAT_FUFLOW) {
286 printk(KERN_ERR "%s: Transmit fifo underflow, driver bug.\n", dev->name);
287 qep->net_stats.tx_errors++;
288 mace_hwbug_workaround = 1;
289 }
290
291 if (qe_status & CREG_STAT_JERROR) {
292 printk(KERN_ERR "%s: Jabber error.\n", dev->name);
293 }
294
295 if (qe_status & CREG_STAT_BERROR) {
296 printk(KERN_ERR "%s: Babble error.\n", dev->name);
297 }
298
299 if (qe_status & CREG_STAT_CCOFLOW) {
300 qep->net_stats.tx_errors += 256;
301 qep->net_stats.collisions += 256;
302 }
303
304 if (qe_status & CREG_STAT_TXDERROR) {
305 printk(KERN_ERR "%s: Transmit descriptor is bogus, driver bug.\n", dev->name);
306 qep->net_stats.tx_errors++;
307 qep->net_stats.tx_aborted_errors++;
308 mace_hwbug_workaround = 1;
309 }
310
311 if (qe_status & CREG_STAT_TXLERR) {
312 printk(KERN_ERR "%s: Transmit late error.\n", dev->name);
313 qep->net_stats.tx_errors++;
314 mace_hwbug_workaround = 1;
315 }
316
317 if (qe_status & CREG_STAT_TXPERR) {
318 printk(KERN_ERR "%s: Transmit DMA parity error.\n", dev->name);
319 qep->net_stats.tx_errors++;
320 qep->net_stats.tx_aborted_errors++;
321 mace_hwbug_workaround = 1;
322 }
323
324 if (qe_status & CREG_STAT_TXSERR) {
325 printk(KERN_ERR "%s: Transmit DMA sbus error ack.\n", dev->name);
326 qep->net_stats.tx_errors++;
327 qep->net_stats.tx_aborted_errors++;
328 mace_hwbug_workaround = 1;
329 }
330
331 if (qe_status & CREG_STAT_RCCOFLOW) {
332 qep->net_stats.rx_errors += 256;
333 qep->net_stats.collisions += 256;
334 }
335
336 if (qe_status & CREG_STAT_RUOFLOW) {
337 qep->net_stats.rx_errors += 256;
338 qep->net_stats.rx_over_errors += 256;
339 }
340
341 if (qe_status & CREG_STAT_MCOFLOW) {
342 qep->net_stats.rx_errors += 256;
343 qep->net_stats.rx_missed_errors += 256;
344 }
345
346 if (qe_status & CREG_STAT_RXFOFLOW) {
347 printk(KERN_ERR "%s: Receive fifo overflow.\n", dev->name);
348 qep->net_stats.rx_errors++;
349 qep->net_stats.rx_over_errors++;
350 }
351
352 if (qe_status & CREG_STAT_RLCOLL) {
353 printk(KERN_ERR "%s: Late receive collision.\n", dev->name);
354 qep->net_stats.rx_errors++;
355 qep->net_stats.collisions++;
356 }
357
358 if (qe_status & CREG_STAT_FCOFLOW) {
359 qep->net_stats.rx_errors += 256;
360 qep->net_stats.rx_frame_errors += 256;
361 }
362
363 if (qe_status & CREG_STAT_CECOFLOW) {
364 qep->net_stats.rx_errors += 256;
365 qep->net_stats.rx_crc_errors += 256;
366 }
367
368 if (qe_status & CREG_STAT_RXDROP) {
369 printk(KERN_ERR "%s: Receive packet dropped.\n", dev->name);
370 qep->net_stats.rx_errors++;
371 qep->net_stats.rx_dropped++;
372 qep->net_stats.rx_missed_errors++;
373 }
374
375 if (qe_status & CREG_STAT_RXSMALL) {
376 printk(KERN_ERR "%s: Receive buffer too small, driver bug.\n", dev->name);
377 qep->net_stats.rx_errors++;
378 qep->net_stats.rx_length_errors++;
379 }
380
381 if (qe_status & CREG_STAT_RXLERR) {
382 printk(KERN_ERR "%s: Receive late error.\n", dev->name);
383 qep->net_stats.rx_errors++;
384 mace_hwbug_workaround = 1;
385 }
386
387 if (qe_status & CREG_STAT_RXPERR) {
388 printk(KERN_ERR "%s: Receive DMA parity error.\n", dev->name);
389 qep->net_stats.rx_errors++;
390 qep->net_stats.rx_missed_errors++;
391 mace_hwbug_workaround = 1;
392 }
393
394 if (qe_status & CREG_STAT_RXSERR) {
395 printk(KERN_ERR "%s: Receive DMA sbus error ack.\n", dev->name);
396 qep->net_stats.rx_errors++;
397 qep->net_stats.rx_missed_errors++;
398 mace_hwbug_workaround = 1;
399 }
400
401 if (mace_hwbug_workaround)
402 qe_init(qep, 1);
403 return mace_hwbug_workaround;
404 }
405
406 /* Per-QE receive interrupt service routine. Just like on the happy meal
407 * we receive directly into skb's with a small packet copy water mark.
408 */
409 static void qe_rx(struct sunqe *qep)
410 {
411 struct qe_rxd *rxbase = &qep->qe_block->qe_rxd[0];
412 struct qe_rxd *this;
413 struct sunqe_buffers *qbufs = qep->buffers;
414 __u32 qbufs_dvma = qep->buffers_dvma;
415 int elem = qep->rx_new, drops = 0;
416 u32 flags;
417
418 this = &rxbase[elem];
419 while (!((flags = this->rx_flags) & RXD_OWN)) {
420 struct sk_buff *skb;
421 unsigned char *this_qbuf =
422 &qbufs->rx_buf[elem & (RX_RING_SIZE - 1)][0];
423 __u32 this_qbuf_dvma = qbufs_dvma +
424 qebuf_offset(rx_buf, (elem & (RX_RING_SIZE - 1)));
425 struct qe_rxd *end_rxd =
426 &rxbase[(elem+RX_RING_SIZE)&(RX_RING_MAXSIZE-1)];
427 int len = (flags & RXD_LENGTH) - 4; /* QE adds ether FCS size to len */
428
429 /* Check for errors. */
430 if (len < ETH_ZLEN) {
431 qep->net_stats.rx_errors++;
432 qep->net_stats.rx_length_errors++;
433 qep->net_stats.rx_dropped++;
434 } else {
435 skb = dev_alloc_skb(len + 2);
436 if (skb == NULL) {
437 drops++;
438 qep->net_stats.rx_dropped++;
439 } else {
440 skb->dev = qep->dev;
441 skb_reserve(skb, 2);
442 skb_put(skb, len);
443 eth_copy_and_sum(skb, (unsigned char *) this_qbuf,
444 len, 0);
445 skb->protocol = eth_type_trans(skb, qep->dev);
446 netif_rx(skb);
447 qep->dev->last_rx = jiffies;
448 qep->net_stats.rx_packets++;
449 qep->net_stats.rx_bytes += len;
450 }
451 }
452 end_rxd->rx_addr = this_qbuf_dvma;
453 end_rxd->rx_flags = (RXD_OWN | ((RXD_PKT_SZ) & RXD_LENGTH));
454
455 elem = NEXT_RX(elem);
456 this = &rxbase[elem];
457 }
458 qep->rx_new = elem;
459 if (drops)
460 printk(KERN_NOTICE "%s: Memory squeeze, deferring packet.\n", qep->dev->name);
461 }
462
463 static void qe_tx_reclaim(struct sunqe *qep);
464
465 /* Interrupts for all QE's get filtered out via the QEC master controller,
466 * so we just run through each qe and check to see who is signaling
467 * and thus needs to be serviced.
468 */
469 static irqreturn_t qec_interrupt(int irq, void *dev_id, struct pt_regs *regs)
470 {
471 struct sunqec *qecp = (struct sunqec *) dev_id;
472 u32 qec_status;
473 int channel = 0;
474
475 /* Latch the status now. */
476 qec_status = sbus_readl(qecp->gregs + GLOB_STAT);
477 while (channel < 4) {
478 if (qec_status & 0xf) {
479 struct sunqe *qep = qecp->qes[channel];
480 u32 qe_status;
481
482 qe_status = sbus_readl(qep->qcregs + CREG_STAT);
483 if (qe_status & CREG_STAT_ERRORS) {
484 if (qe_is_bolixed(qep, qe_status))
485 goto next;
486 }
487 if (qe_status & CREG_STAT_RXIRQ)
488 qe_rx(qep);
489 if (netif_queue_stopped(qep->dev) &&
490 (qe_status & CREG_STAT_TXIRQ)) {
491 spin_lock(&qep->lock);
492 qe_tx_reclaim(qep);
493 if (TX_BUFFS_AVAIL(qep) > 0) {
494 /* Wake net queue and return to
495 * lazy tx reclaim.
496 */
497 netif_wake_queue(qep->dev);
498 sbus_writel(1, qep->qcregs + CREG_TIMASK);
499 }
500 spin_unlock(&qep->lock);
501 }
502 next:
503 ;
504 }
505 qec_status >>= 4;
506 channel++;
507 }
508
509 return IRQ_HANDLED;
510 }
511
512 static int qe_open(struct net_device *dev)
513 {
514 struct sunqe *qep = (struct sunqe *) dev->priv;
515
516 qep->mconfig = (MREGS_MCONFIG_TXENAB |
517 MREGS_MCONFIG_RXENAB |
518 MREGS_MCONFIG_MBAENAB);
519 return qe_init(qep, 0);
520 }
521
522 static int qe_close(struct net_device *dev)
523 {
524 struct sunqe *qep = (struct sunqe *) dev->priv;
525
526 qe_stop(qep);
527 return 0;
528 }
529
530 /* Reclaim TX'd frames from the ring. This must always run under
531 * the IRQ protected qep->lock.
532 */
533 static void qe_tx_reclaim(struct sunqe *qep)
534 {
535 struct qe_txd *txbase = &qep->qe_block->qe_txd[0];
536 int elem = qep->tx_old;
537
538 while (elem != qep->tx_new) {
539 u32 flags = txbase[elem].tx_flags;
540
541 if (flags & TXD_OWN)
542 break;
543 elem = NEXT_TX(elem);
544 }
545 qep->tx_old = elem;
546 }
547
548 static void qe_tx_timeout(struct net_device *dev)
549 {
550 struct sunqe *qep = (struct sunqe *) dev->priv;
551 int tx_full;
552
553 spin_lock_irq(&qep->lock);
554
555 /* Try to reclaim, if that frees up some tx
556 * entries, we're fine.
557 */
558 qe_tx_reclaim(qep);
559 tx_full = TX_BUFFS_AVAIL(qep) <= 0;
560
561 spin_unlock_irq(&qep->lock);
562
563 if (! tx_full)
564 goto out;
565
566 printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
567 qe_init(qep, 1);
568
569 out:
570 netif_wake_queue(dev);
571 }
572
573 /* Get a packet queued to go onto the wire. */
574 static int qe_start_xmit(struct sk_buff *skb, struct net_device *dev)
575 {
576 struct sunqe *qep = (struct sunqe *) dev->priv;
577 struct sunqe_buffers *qbufs = qep->buffers;
578 __u32 txbuf_dvma, qbufs_dvma = qep->buffers_dvma;
579 unsigned char *txbuf;
580 int len, entry;
581
582 spin_lock_irq(&qep->lock);
583
584 qe_tx_reclaim(qep);
585
586 len = skb->len;
587 entry = qep->tx_new;
588
589 txbuf = &qbufs->tx_buf[entry & (TX_RING_SIZE - 1)][0];
590 txbuf_dvma = qbufs_dvma +
591 qebuf_offset(tx_buf, (entry & (TX_RING_SIZE - 1)));
592
593 /* Avoid a race... */
594 qep->qe_block->qe_txd[entry].tx_flags = TXD_UPDATE;
595
596 memcpy(txbuf, skb->data, len);
597
598 qep->qe_block->qe_txd[entry].tx_addr = txbuf_dvma;
599 qep->qe_block->qe_txd[entry].tx_flags =
600 (TXD_OWN | TXD_SOP | TXD_EOP | (len & TXD_LENGTH));
601 qep->tx_new = NEXT_TX(entry);
602
603 /* Get it going. */
604 dev->trans_start = jiffies;
605 sbus_writel(CREG_CTRL_TWAKEUP, qep->qcregs + CREG_CTRL);
606
607 qep->net_stats.tx_packets++;
608 qep->net_stats.tx_bytes += len;
609
610 if (TX_BUFFS_AVAIL(qep) <= 0) {
611 /* Halt the net queue and enable tx interrupts.
612 * When the tx queue empties the tx irq handler
613 * will wake up the queue and return us back to
614 * the lazy tx reclaim scheme.
615 */
616 netif_stop_queue(dev);
617 sbus_writel(0, qep->qcregs + CREG_TIMASK);
618 }
619 spin_unlock_irq(&qep->lock);
620
621 dev_kfree_skb(skb);
622
623 return 0;
624 }
625
626 static struct net_device_stats *qe_get_stats(struct net_device *dev)
627 {
628 struct sunqe *qep = (struct sunqe *) dev->priv;
629
630 return &qep->net_stats;
631 }
632
633 static void qe_set_multicast(struct net_device *dev)
634 {
635 struct sunqe *qep = (struct sunqe *) dev->priv;
636 struct dev_mc_list *dmi = dev->mc_list;
637 u8 new_mconfig = qep->mconfig;
638 char *addrs;
639 int i;
640 u32 crc;
641
642 /* Lock out others. */
643 netif_stop_queue(dev);
644
645 if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 64)) {
646 sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_LARESET,
647 qep->mregs + MREGS_IACONFIG);
648 while ((sbus_readb(qep->mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
649 barrier();
650 for (i = 0; i < 8; i++)
651 sbus_writeb(0xff, qep->mregs + MREGS_FILTER);
652 sbus_writeb(0, qep->mregs + MREGS_IACONFIG);
653 } else if (dev->flags & IFF_PROMISC) {
654 new_mconfig |= MREGS_MCONFIG_PROMISC;
655 } else {
656 u16 hash_table[4];
657 u8 *hbytes = (unsigned char *) &hash_table[0];
658
659 for (i = 0; i < 4; i++)
660 hash_table[i] = 0;
661
662 for (i = 0; i < dev->mc_count; i++) {
663 addrs = dmi->dmi_addr;
664 dmi = dmi->next;
665
666 if (!(*addrs & 1))
667 continue;
668 crc = ether_crc_le(6, addrs);
669 crc >>= 26;
670 hash_table[crc >> 4] |= 1 << (crc & 0xf);
671 }
672 /* Program the qe with the new filter value. */
673 sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_LARESET,
674 qep->mregs + MREGS_IACONFIG);
675 while ((sbus_readb(qep->mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
676 barrier();
677 for (i = 0; i < 8; i++) {
678 u8 tmp = *hbytes++;
679 sbus_writeb(tmp, qep->mregs + MREGS_FILTER);
680 }
681 sbus_writeb(0, qep->mregs + MREGS_IACONFIG);
682 }
683
684 /* Any change of the logical address filter, the physical address,
685 * or enabling/disabling promiscuous mode causes the MACE to disable
686 * the receiver. So we must re-enable them here or else the MACE
687 * refuses to listen to anything on the network. Sheesh, took
688 * me a day or two to find this bug.
689 */
690 qep->mconfig = new_mconfig;
691 sbus_writeb(qep->mconfig, qep->mregs + MREGS_MCONFIG);
692
693 /* Let us get going again. */
694 netif_wake_queue(dev);
695 }
696
697 /* Ethtool support... */
698 static void qe_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
699 {
700 struct sunqe *qep = dev->priv;
701
702 strcpy(info->driver, "sunqe");
703 strcpy(info->version, "3.0");
704 sprintf(info->bus_info, "SBUS:%d",
705 qep->qe_sdev->slot);
706 }
707
708 static u32 qe_get_link(struct net_device *dev)
709 {
710 struct sunqe *qep = dev->priv;
711 void __iomem *mregs = qep->mregs;
712 u8 phyconfig;
713
714 spin_lock_irq(&qep->lock);
715 phyconfig = sbus_readb(mregs + MREGS_PHYCONFIG);
716 spin_unlock_irq(&qep->lock);
717
718 return (phyconfig & MREGS_PHYCONFIG_LSTAT);
719 }
720
721 static struct ethtool_ops qe_ethtool_ops = {
722 .get_drvinfo = qe_get_drvinfo,
723 .get_link = qe_get_link,
724 };
725
726 /* This is only called once at boot time for each card probed. */
727 static inline void qec_init_once(struct sunqec *qecp, struct sbus_dev *qsdev)
728 {
729 u8 bsizes = qecp->qec_bursts;
730
731 if (sbus_can_burst64(qsdev) && (bsizes & DMA_BURST64)) {
732 sbus_writel(GLOB_CTRL_B64, qecp->gregs + GLOB_CTRL);
733 } else if (bsizes & DMA_BURST32) {
734 sbus_writel(GLOB_CTRL_B32, qecp->gregs + GLOB_CTRL);
735 } else {
736 sbus_writel(GLOB_CTRL_B16, qecp->gregs + GLOB_CTRL);
737 }
738
739 /* Packetsize only used in 100baseT BigMAC configurations,
740 * set it to zero just to be on the safe side.
741 */
742 sbus_writel(GLOB_PSIZE_2048, qecp->gregs + GLOB_PSIZE);
743
744 /* Set the local memsize register, divided up to one piece per QE channel. */
745 sbus_writel((qsdev->reg_addrs[1].reg_size >> 2),
746 qecp->gregs + GLOB_MSIZE);
747
748 /* Divide up the local QEC memory amongst the 4 QE receiver and
749 * transmitter FIFOs. Basically it is (total / 2 / num_channels).
750 */
751 sbus_writel((qsdev->reg_addrs[1].reg_size >> 2) >> 1,
752 qecp->gregs + GLOB_TSIZE);
753 sbus_writel((qsdev->reg_addrs[1].reg_size >> 2) >> 1,
754 qecp->gregs + GLOB_RSIZE);
755 }
756
757 static u8 __init qec_get_burst(struct device_node *dp)
758 {
759 u8 bsizes, bsizes_more;
760
761 /* Find and set the burst sizes for the QEC, since it
762 * does the actual dma for all 4 channels.
763 */
764 bsizes = of_getintprop_default(dp, "burst-sizes", 0xff);
765 bsizes &= 0xff;
766 bsizes_more = of_getintprop_default(dp->parent, "burst-sizes", 0xff);
767
768 if (bsizes_more != 0xff)
769 bsizes &= bsizes_more;
770 if (bsizes == 0xff || (bsizes & DMA_BURST16) == 0 ||
771 (bsizes & DMA_BURST32)==0)
772 bsizes = (DMA_BURST32 - 1);
773
774 return bsizes;
775 }
776
777 static struct sunqec * __init get_qec(struct sbus_dev *child_sdev)
778 {
779 struct sbus_dev *qec_sdev = child_sdev->parent;
780 struct sunqec *qecp;
781
782 for (qecp = root_qec_dev; qecp; qecp = qecp->next_module) {
783 if (qecp->qec_sdev == qec_sdev)
784 break;
785 }
786 if (!qecp) {
787 qecp = kzalloc(sizeof(struct sunqec), GFP_KERNEL);
788 if (qecp) {
789 u32 ctrl;
790
791 qecp->qec_sdev = qec_sdev;
792 qecp->gregs = sbus_ioremap(&qec_sdev->resource[0], 0,
793 GLOB_REG_SIZE,
794 "QEC Global Registers");
795 if (!qecp->gregs)
796 goto fail;
797
798 /* Make sure the QEC is in MACE mode. */
799 ctrl = sbus_readl(qecp->gregs + GLOB_CTRL);
800 ctrl &= 0xf0000000;
801 if (ctrl != GLOB_CTRL_MMODE) {
802 printk(KERN_ERR "qec: Not in MACE mode!\n");
803 goto fail;
804 }
805
806 if (qec_global_reset(qecp->gregs))
807 goto fail;
808
809 qecp->qec_bursts = qec_get_burst(qec_sdev->ofdev.node);
810
811 qec_init_once(qecp, qec_sdev);
812
813 if (request_irq(qec_sdev->irqs[0], &qec_interrupt,
814 IRQF_SHARED, "qec", (void *) qecp)) {
815 printk(KERN_ERR "qec: Can't register irq.\n");
816 goto fail;
817 }
818
819 qecp->next_module = root_qec_dev;
820 root_qec_dev = qecp;
821 }
822 }
823
824 return qecp;
825
826 fail:
827 if (qecp->gregs)
828 sbus_iounmap(qecp->gregs, GLOB_REG_SIZE);
829 kfree(qecp);
830 return NULL;
831 }
832
833 static int __init qec_ether_init(struct sbus_dev *sdev)
834 {
835 static unsigned version_printed;
836 struct net_device *dev;
837 struct sunqe *qe;
838 struct sunqec *qecp;
839 int i, res;
840
841 if (version_printed++ == 0)
842 printk(KERN_INFO "%s", version);
843
844 dev = alloc_etherdev(sizeof(struct sunqe));
845 if (!dev)
846 return -ENOMEM;
847
848 qe = netdev_priv(dev);
849
850 i = of_getintprop_default(sdev->ofdev.node, "channel#", -1);
851 if (i == -1) {
852 struct sbus_dev *td = sdev->parent->child;
853 i = 0;
854 while (td != sdev) {
855 td = td->next;
856 i++;
857 }
858 }
859 qe->channel = i;
860 spin_lock_init(&qe->lock);
861
862 res = -ENODEV;
863 qecp = get_qec(sdev);
864 if (!qecp)
865 goto fail;
866
867 qecp->qes[qe->channel] = qe;
868 qe->dev = dev;
869 qe->parent = qecp;
870 qe->qe_sdev = sdev;
871
872 res = -ENOMEM;
873 qe->qcregs = sbus_ioremap(&qe->qe_sdev->resource[0], 0,
874 CREG_REG_SIZE, "QEC Channel Registers");
875 if (!qe->qcregs) {
876 printk(KERN_ERR "qe: Cannot map channel registers.\n");
877 goto fail;
878 }
879
880 qe->mregs = sbus_ioremap(&qe->qe_sdev->resource[1], 0,
881 MREGS_REG_SIZE, "QE MACE Registers");
882 if (!qe->mregs) {
883 printk(KERN_ERR "qe: Cannot map MACE registers.\n");
884 goto fail;
885 }
886
887 qe->qe_block = sbus_alloc_consistent(qe->qe_sdev,
888 PAGE_SIZE,
889 &qe->qblock_dvma);
890 qe->buffers = sbus_alloc_consistent(qe->qe_sdev,
891 sizeof(struct sunqe_buffers),
892 &qe->buffers_dvma);
893 if (qe->qe_block == NULL || qe->qblock_dvma == 0 ||
894 qe->buffers == NULL || qe->buffers_dvma == 0)
895 goto fail;
896
897 /* Stop this QE. */
898 qe_stop(qe);
899
900 SET_MODULE_OWNER(dev);
901 SET_NETDEV_DEV(dev, &sdev->ofdev.dev);
902
903 dev->open = qe_open;
904 dev->stop = qe_close;
905 dev->hard_start_xmit = qe_start_xmit;
906 dev->get_stats = qe_get_stats;
907 dev->set_multicast_list = qe_set_multicast;
908 dev->tx_timeout = qe_tx_timeout;
909 dev->watchdog_timeo = 5*HZ;
910 dev->irq = sdev->irqs[0];
911 dev->dma = 0;
912 dev->ethtool_ops = &qe_ethtool_ops;
913
914 res = register_netdev(dev);
915 if (res)
916 goto fail;
917
918 dev_set_drvdata(&sdev->ofdev.dev, qe);
919
920 printk(KERN_INFO "%s: qe channel[%d] ", dev->name, qe->channel);
921 for (i = 0; i < 6; i++)
922 printk ("%2.2x%c",
923 dev->dev_addr[i],
924 i == 5 ? ' ': ':');
925 printk("\n");
926
927
928 return 0;
929
930 fail:
931 if (qe->qcregs)
932 sbus_iounmap(qe->qcregs, CREG_REG_SIZE);
933 if (qe->mregs)
934 sbus_iounmap(qe->mregs, MREGS_REG_SIZE);
935 if (qe->qe_block)
936 sbus_free_consistent(qe->qe_sdev,
937 PAGE_SIZE,
938 qe->qe_block,
939 qe->qblock_dvma);
940 if (qe->buffers)
941 sbus_free_consistent(qe->qe_sdev,
942 sizeof(struct sunqe_buffers),
943 qe->buffers,
944 qe->buffers_dvma);
945
946 free_netdev(dev);
947
948 return res;
949 }
950
951 static int __devinit qec_sbus_probe(struct of_device *dev, const struct of_device_id *match)
952 {
953 struct sbus_dev *sdev = to_sbus_device(&dev->dev);
954
955 return qec_ether_init(sdev);
956 }
957
958 static int __devexit qec_sbus_remove(struct of_device *dev)
959 {
960 struct sunqe *qp = dev_get_drvdata(&dev->dev);
961 struct net_device *net_dev = qp->dev;
962
963 unregister_netdevice(net_dev);
964
965 sbus_iounmap(qp->qcregs, CREG_REG_SIZE);
966 sbus_iounmap(qp->mregs, MREGS_REG_SIZE);
967 sbus_free_consistent(qp->qe_sdev,
968 PAGE_SIZE,
969 qp->qe_block,
970 qp->qblock_dvma);
971 sbus_free_consistent(qp->qe_sdev,
972 sizeof(struct sunqe_buffers),
973 qp->buffers,
974 qp->buffers_dvma);
975
976 free_netdev(net_dev);
977
978 dev_set_drvdata(&dev->dev, NULL);
979
980 return 0;
981 }
982
983 static struct of_device_id qec_sbus_match[] = {
984 {
985 .name = "qe",
986 },
987 {},
988 };
989
990 MODULE_DEVICE_TABLE(of, qec_sbus_match);
991
992 static struct of_platform_driver qec_sbus_driver = {
993 .name = "qec",
994 .match_table = qec_sbus_match,
995 .probe = qec_sbus_probe,
996 .remove = __devexit_p(qec_sbus_remove),
997 };
998
999 static int __init qec_init(void)
1000 {
1001 return of_register_driver(&qec_sbus_driver, &sbus_bus_type);
1002 }
1003
1004 static void __exit qec_exit(void)
1005 {
1006 of_unregister_driver(&qec_sbus_driver);
1007
1008 while (root_qec_dev) {
1009 struct sunqec *next = root_qec_dev->next_module;
1010
1011 free_irq(root_qec_dev->qec_sdev->irqs[0],
1012 (void *) root_qec_dev);
1013 sbus_iounmap(root_qec_dev->gregs, GLOB_REG_SIZE);
1014
1015 kfree(root_qec_dev);
1016
1017 root_qec_dev = next;
1018 }
1019 }
1020
1021 module_init(qec_init);
1022 module_exit(qec_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree