1 // SPDX-License-Identifier: GPL-2.0
2 /* sunqe.c: Sparc QuadEthernet 10baseT SBUS card driver.
3 * Once again I am out to prove that every ethernet
4 * controller out there can be most efficiently programmed
5 * if you make it look like a LANCE.
6 *
7 * Copyright (C) 1996, 1999, 2003, 2006, 2008 David S. Miller (davem@davemloft.net)
8 */
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/types.h>
13 #include <linux/errno.h>
14 #include <linux/fcntl.h>
15 #include <linux/interrupt.h>
16 #include <linux/ioport.h>
17 #include <linux/in.h>
18 #include <linux/slab.h>
19 #include <linux/string.h>
20 #include <linux/delay.h>
21 #include <linux/init.h>
22 #include <linux/crc32.h>
23 #include <linux/netdevice.h>
24 #include <linux/etherdevice.h>
25 #include <linux/skbuff.h>
26 #include <linux/ethtool.h>
27 #include <linux/bitops.h>
28 #include <linux/dma-mapping.h>
29 #include <linux/of.h>
30 #include <linux/pgtable.h>
31 #include <linux/platform_device.h>
32
33 #include <asm/io.h>
34 #include <asm/dma.h>
35 #include <asm/byteorder.h>
36 #include <asm/idprom.h>
37 #include <asm/openprom.h>
38 #include <asm/oplib.h>
39 #include <asm/auxio.h>
40 #include <asm/irq.h>
41
42 #include "sunqe.h"
43
44 #define DRV_NAME "sunqe"
45 #define DRV_VERSION "4.1"
46 #define DRV_RELDATE "August 27, 2008"
47 #define DRV_AUTHOR "David S. Miller (davem@davemloft.net)"
48
49 static char version[] =
50 DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " " DRV_AUTHOR "\n";
51
52 MODULE_VERSION(DRV_VERSION);
53 MODULE_AUTHOR(DRV_AUTHOR);
54 MODULE_DESCRIPTION("Sun QuadEthernet 10baseT SBUS card driver");
55 MODULE_LICENSE("GPL");
56
57 static struct sunqec *root_qec_dev;
58
59 static void qe_set_multicast(struct net_device *dev);
60
61 #define QEC_RESET_TRIES 200
62
qec_global_reset(void __iomem * gregs)63 static inline int qec_global_reset(void __iomem *gregs)
64 {
65 int tries = QEC_RESET_TRIES;
66
67 sbus_writel(GLOB_CTRL_RESET, gregs + GLOB_CTRL);
68 while (--tries) {
69 u32 tmp = sbus_readl(gregs + GLOB_CTRL);
70 if (tmp & GLOB_CTRL_RESET) {
71 udelay(20);
72 continue;
73 }
74 break;
75 }
76 if (tries)
77 return 0;
78 printk(KERN_ERR "QuadEther: AIEEE cannot reset the QEC!\n");
79 return -1;
80 }
81
82 #define MACE_RESET_RETRIES 200
83 #define QE_RESET_RETRIES 200
84
qe_stop(struct sunqe * qep)85 static inline int qe_stop(struct sunqe *qep)
86 {
87 void __iomem *cregs = qep->qcregs;
88 void __iomem *mregs = qep->mregs;
89 int tries;
90
91 /* Reset the MACE, then the QEC channel. */
92 sbus_writeb(MREGS_BCONFIG_RESET, mregs + MREGS_BCONFIG);
93 tries = MACE_RESET_RETRIES;
94 while (--tries) {
95 u8 tmp = sbus_readb(mregs + MREGS_BCONFIG);
96 if (tmp & MREGS_BCONFIG_RESET) {
97 udelay(20);
98 continue;
99 }
100 break;
101 }
102 if (!tries) {
103 printk(KERN_ERR "QuadEther: AIEEE cannot reset the MACE!\n");
104 return -1;
105 }
106
107 sbus_writel(CREG_CTRL_RESET, cregs + CREG_CTRL);
108 tries = QE_RESET_RETRIES;
109 while (--tries) {
110 u32 tmp = sbus_readl(cregs + CREG_CTRL);
111 if (tmp & CREG_CTRL_RESET) {
112 udelay(20);
113 continue;
114 }
115 break;
116 }
117 if (!tries) {
118 printk(KERN_ERR "QuadEther: Cannot reset QE channel!\n");
119 return -1;
120 }
121 return 0;
122 }
123
qe_init_rings(struct sunqe * qep)124 static void qe_init_rings(struct sunqe *qep)
125 {
126 struct qe_init_block *qb = qep->qe_block;
127 struct sunqe_buffers *qbufs = qep->buffers;
128 __u32 qbufs_dvma = (__u32)qep->buffers_dvma;
129 int i;
130
131 qep->rx_new = qep->rx_old = qep->tx_new = qep->tx_old = 0;
132 memset(qb, 0, sizeof(struct qe_init_block));
133 memset(qbufs, 0, sizeof(struct sunqe_buffers));
134 for (i = 0; i < RX_RING_SIZE; i++) {
135 qb->qe_rxd[i].rx_addr = qbufs_dvma + qebuf_offset(rx_buf, i);
136 qb->qe_rxd[i].rx_flags =
137 (RXD_OWN | ((RXD_PKT_SZ) & RXD_LENGTH));
138 }
139 }
140
qe_init(struct sunqe * qep,int from_irq)141 static int qe_init(struct sunqe *qep, int from_irq)
142 {
143 struct sunqec *qecp = qep->parent;
144 void __iomem *cregs = qep->qcregs;
145 void __iomem *mregs = qep->mregs;
146 void __iomem *gregs = qecp->gregs;
147 const unsigned char *e = &qep->dev->dev_addr[0];
148 __u32 qblk_dvma = (__u32)qep->qblock_dvma;
149 u32 tmp;
150 int i;
151
152 /* Shut it up. */
153 if (qe_stop(qep))
154 return -EAGAIN;
155
156 /* Setup initial rx/tx init block pointers. */
157 sbus_writel(qblk_dvma + qib_offset(qe_rxd, 0), cregs + CREG_RXDS);
158 sbus_writel(qblk_dvma + qib_offset(qe_txd, 0), cregs + CREG_TXDS);
159
160 /* Enable/mask the various irq's. */
161 sbus_writel(0, cregs + CREG_RIMASK);
162 sbus_writel(1, cregs + CREG_TIMASK);
163
164 sbus_writel(0, cregs + CREG_QMASK);
165 sbus_writel(CREG_MMASK_RXCOLL, cregs + CREG_MMASK);
166
167 /* Setup the FIFO pointers into QEC local memory. */
168 tmp = qep->channel * sbus_readl(gregs + GLOB_MSIZE);
169 sbus_writel(tmp, cregs + CREG_RXRBUFPTR);
170 sbus_writel(tmp, cregs + CREG_RXWBUFPTR);
171
172 tmp = sbus_readl(cregs + CREG_RXRBUFPTR) +
173 sbus_readl(gregs + GLOB_RSIZE);
174 sbus_writel(tmp, cregs + CREG_TXRBUFPTR);
175 sbus_writel(tmp, cregs + CREG_TXWBUFPTR);
176
177 /* Clear the channel collision counter. */
178 sbus_writel(0, cregs + CREG_CCNT);
179
180 /* For 10baseT, inter frame space nor throttle seems to be necessary. */
181 sbus_writel(0, cregs + CREG_PIPG);
182
183 /* Now dork with the AMD MACE. */
184 sbus_writeb(MREGS_PHYCONFIG_AUTO, mregs + MREGS_PHYCONFIG);
185 sbus_writeb(MREGS_TXFCNTL_AUTOPAD, mregs + MREGS_TXFCNTL);
186 sbus_writeb(0, mregs + MREGS_RXFCNTL);
187
188 /* The QEC dma's the rx'd packets from local memory out to main memory,
189 * and therefore it interrupts when the packet reception is "complete".
190 * So don't listen for the MACE talking about it.
191 */
192 sbus_writeb(MREGS_IMASK_COLL | MREGS_IMASK_RXIRQ, mregs + MREGS_IMASK);
193 sbus_writeb(MREGS_BCONFIG_BSWAP | MREGS_BCONFIG_64TS, mregs + MREGS_BCONFIG);
194 sbus_writeb((MREGS_FCONFIG_TXF16 | MREGS_FCONFIG_RXF32 |
195 MREGS_FCONFIG_RFWU | MREGS_FCONFIG_TFWU),
196 mregs + MREGS_FCONFIG);
197
198 /* Only usable interface on QuadEther is twisted pair. */
199 sbus_writeb(MREGS_PLSCONFIG_TP, mregs + MREGS_PLSCONFIG);
200
201 /* Tell MACE we are changing the ether address. */
202 sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_PARESET,
203 mregs + MREGS_IACONFIG);
204 while ((sbus_readb(mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
205 barrier();
206 sbus_writeb(e[0], mregs + MREGS_ETHADDR);
207 sbus_writeb(e[1], mregs + MREGS_ETHADDR);
208 sbus_writeb(e[2], mregs + MREGS_ETHADDR);
209 sbus_writeb(e[3], mregs + MREGS_ETHADDR);
210 sbus_writeb(e[4], mregs + MREGS_ETHADDR);
211 sbus_writeb(e[5], mregs + MREGS_ETHADDR);
212
213 /* Clear out the address filter. */
214 sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_LARESET,
215 mregs + MREGS_IACONFIG);
216 while ((sbus_readb(mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
217 barrier();
218 for (i = 0; i < 8; i++)
219 sbus_writeb(0, mregs + MREGS_FILTER);
220
221 /* Address changes are now complete. */
222 sbus_writeb(0, mregs + MREGS_IACONFIG);
223
224 qe_init_rings(qep);
225
226 /* Wait a little bit for the link to come up... */
227 mdelay(5);
228 if (!(sbus_readb(mregs + MREGS_PHYCONFIG) & MREGS_PHYCONFIG_LTESTDIS)) {
229 int tries = 50;
230
231 while (--tries) {
232 u8 tmp;
233
234 mdelay(5);
235 barrier();
236 tmp = sbus_readb(mregs + MREGS_PHYCONFIG);
237 if ((tmp & MREGS_PHYCONFIG_LSTAT) != 0)
238 break;
239 }
240 if (tries == 0)
241 printk(KERN_NOTICE "%s: Warning, link state is down.\n", qep->dev->name);
242 }
243
244 /* Missed packet counter is cleared on a read. */
245 sbus_readb(mregs + MREGS_MPCNT);
246
247 /* Reload multicast information, this will enable the receiver
248 * and transmitter.
249 */
250 qe_set_multicast(qep->dev);
251
252 /* QEC should now start to show interrupts. */
253 return 0;
254 }
255
256 /* Grrr, certain error conditions completely lock up the AMD MACE,
257 * so when we get these we _must_ reset the chip.
258 */
qe_is_bolixed(struct sunqe * qep,u32 qe_status)259 static int qe_is_bolixed(struct sunqe *qep, u32 qe_status)
260 {
261 struct net_device *dev = qep->dev;
262 int mace_hwbug_workaround = 0;
263
264 if (qe_status & CREG_STAT_EDEFER) {
265 printk(KERN_ERR "%s: Excessive transmit defers.\n", dev->name);
266 dev->stats.tx_errors++;
267 }
268
269 if (qe_status & CREG_STAT_CLOSS) {
270 printk(KERN_ERR "%s: Carrier lost, link down?\n", dev->name);
271 dev->stats.tx_errors++;
272 dev->stats.tx_carrier_errors++;
273 }
274
275 if (qe_status & CREG_STAT_ERETRIES) {
276 printk(KERN_ERR "%s: Excessive transmit retries (more than 16).\n", dev->name);
277 dev->stats.tx_errors++;
278 mace_hwbug_workaround = 1;
279 }
280
281 if (qe_status & CREG_STAT_LCOLL) {
282 printk(KERN_ERR "%s: Late transmit collision.\n", dev->name);
283 dev->stats.tx_errors++;
284 dev->stats.collisions++;
285 mace_hwbug_workaround = 1;
286 }
287
288 if (qe_status & CREG_STAT_FUFLOW) {
289 printk(KERN_ERR "%s: Transmit fifo underflow, driver bug.\n", dev->name);
290 dev->stats.tx_errors++;
291 mace_hwbug_workaround = 1;
292 }
293
294 if (qe_status & CREG_STAT_JERROR) {
295 printk(KERN_ERR "%s: Jabber error.\n", dev->name);
296 }
297
298 if (qe_status & CREG_STAT_BERROR) {
299 printk(KERN_ERR "%s: Babble error.\n", dev->name);
300 }
301
302 if (qe_status & CREG_STAT_CCOFLOW) {
303 dev->stats.tx_errors += 256;
304 dev->stats.collisions += 256;
305 }
306
307 if (qe_status & CREG_STAT_TXDERROR) {
308 printk(KERN_ERR "%s: Transmit descriptor is bogus, driver bug.\n", dev->name);
309 dev->stats.tx_errors++;
310 dev->stats.tx_aborted_errors++;
311 mace_hwbug_workaround = 1;
312 }
313
314 if (qe_status & CREG_STAT_TXLERR) {
315 printk(KERN_ERR "%s: Transmit late error.\n", dev->name);
316 dev->stats.tx_errors++;
317 mace_hwbug_workaround = 1;
318 }
319
320 if (qe_status & CREG_STAT_TXPERR) {
321 printk(KERN_ERR "%s: Transmit DMA parity error.\n", dev->name);
322 dev->stats.tx_errors++;
323 dev->stats.tx_aborted_errors++;
324 mace_hwbug_workaround = 1;
325 }
326
327 if (qe_status & CREG_STAT_TXSERR) {
328 printk(KERN_ERR "%s: Transmit DMA sbus error ack.\n", dev->name);
329 dev->stats.tx_errors++;
330 dev->stats.tx_aborted_errors++;
331 mace_hwbug_workaround = 1;
332 }
333
334 if (qe_status & CREG_STAT_RCCOFLOW) {
335 dev->stats.rx_errors += 256;
336 dev->stats.collisions += 256;
337 }
338
339 if (qe_status & CREG_STAT_RUOFLOW) {
340 dev->stats.rx_errors += 256;
341 dev->stats.rx_over_errors += 256;
342 }
343
344 if (qe_status & CREG_STAT_MCOFLOW) {
345 dev->stats.rx_errors += 256;
346 dev->stats.rx_missed_errors += 256;
347 }
348
349 if (qe_status & CREG_STAT_RXFOFLOW) {
350 printk(KERN_ERR "%s: Receive fifo overflow.\n", dev->name);
351 dev->stats.rx_errors++;
352 dev->stats.rx_over_errors++;
353 }
354
355 if (qe_status & CREG_STAT_RLCOLL) {
356 printk(KERN_ERR "%s: Late receive collision.\n", dev->name);
357 dev->stats.rx_errors++;
358 dev->stats.collisions++;
359 }
360
361 if (qe_status & CREG_STAT_FCOFLOW) {
362 dev->stats.rx_errors += 256;
363 dev->stats.rx_frame_errors += 256;
364 }
365
366 if (qe_status & CREG_STAT_CECOFLOW) {
367 dev->stats.rx_errors += 256;
368 dev->stats.rx_crc_errors += 256;
369 }
370
371 if (qe_status & CREG_STAT_RXDROP) {
372 printk(KERN_ERR "%s: Receive packet dropped.\n", dev->name);
373 dev->stats.rx_errors++;
374 dev->stats.rx_dropped++;
375 dev->stats.rx_missed_errors++;
376 }
377
378 if (qe_status & CREG_STAT_RXSMALL) {
379 printk(KERN_ERR "%s: Receive buffer too small, driver bug.\n", dev->name);
380 dev->stats.rx_errors++;
381 dev->stats.rx_length_errors++;
382 }
383
384 if (qe_status & CREG_STAT_RXLERR) {
385 printk(KERN_ERR "%s: Receive late error.\n", dev->name);
386 dev->stats.rx_errors++;
387 mace_hwbug_workaround = 1;
388 }
389
390 if (qe_status & CREG_STAT_RXPERR) {
391 printk(KERN_ERR "%s: Receive DMA parity error.\n", dev->name);
392 dev->stats.rx_errors++;
393 dev->stats.rx_missed_errors++;
394 mace_hwbug_workaround = 1;
395 }
396
397 if (qe_status & CREG_STAT_RXSERR) {
398 printk(KERN_ERR "%s: Receive DMA sbus error ack.\n", dev->name);
399 dev->stats.rx_errors++;
400 dev->stats.rx_missed_errors++;
401 mace_hwbug_workaround = 1;
402 }
403
404 if (mace_hwbug_workaround)
405 qe_init(qep, 1);
406 return mace_hwbug_workaround;
407 }
408
409 /* Per-QE receive interrupt service routine. Just like on the happy meal
410 * we receive directly into skb's with a small packet copy water mark.
411 */
qe_rx(struct sunqe * qep)412 static void qe_rx(struct sunqe *qep)
413 {
414 struct qe_rxd *rxbase = &qep->qe_block->qe_rxd[0];
415 struct net_device *dev = qep->dev;
416 struct qe_rxd *this;
417 struct sunqe_buffers *qbufs = qep->buffers;
418 __u32 qbufs_dvma = (__u32)qep->buffers_dvma;
419 int elem = qep->rx_new;
420 u32 flags;
421
422 this = &rxbase[elem];
423 while (!((flags = this->rx_flags) & RXD_OWN)) {
424 struct sk_buff *skb;
425 unsigned char *this_qbuf =
426 &qbufs->rx_buf[elem & (RX_RING_SIZE - 1)][0];
427 __u32 this_qbuf_dvma = qbufs_dvma +
428 qebuf_offset(rx_buf, (elem & (RX_RING_SIZE - 1)));
429 struct qe_rxd *end_rxd =
430 &rxbase[(elem+RX_RING_SIZE)&(RX_RING_MAXSIZE-1)];
431 int len = (flags & RXD_LENGTH) - 4; /* QE adds ether FCS size to len */
432
433 /* Check for errors. */
434 if (len < ETH_ZLEN) {
435 dev->stats.rx_errors++;
436 dev->stats.rx_length_errors++;
437 dev->stats.rx_dropped++;
438 } else {
439 skb = netdev_alloc_skb(dev, len + 2);
440 if (skb == NULL) {
441 dev->stats.rx_dropped++;
442 } else {
443 skb_reserve(skb, 2);
444 skb_put(skb, len);
445 skb_copy_to_linear_data(skb, this_qbuf,
446 len);
447 skb->protocol = eth_type_trans(skb, qep->dev);
448 netif_rx(skb);
449 dev->stats.rx_packets++;
450 dev->stats.rx_bytes += len;
451 }
452 }
453 end_rxd->rx_addr = this_qbuf_dvma;
454 end_rxd->rx_flags = (RXD_OWN | ((RXD_PKT_SZ) & RXD_LENGTH));
455
456 elem = NEXT_RX(elem);
457 this = &rxbase[elem];
458 }
459 qep->rx_new = elem;
460 }
461
462 static void qe_tx_reclaim(struct sunqe *qep);
463
464 /* Interrupts for all QE's get filtered out via the QEC master controller,
465 * so we just run through each qe and check to see who is signaling
466 * and thus needs to be serviced.
467 */
qec_interrupt(int irq,void * dev_id)468 static irqreturn_t qec_interrupt(int irq, void *dev_id)
469 {
470 struct sunqec *qecp = dev_id;
471 u32 qec_status;
472 int channel = 0;
473
474 /* Latch the status now. */
475 qec_status = sbus_readl(qecp->gregs + GLOB_STAT);
476 while (channel < 4) {
477 if (qec_status & 0xf) {
478 struct sunqe *qep = qecp->qes[channel];
479 u32 qe_status;
480
481 qe_status = sbus_readl(qep->qcregs + CREG_STAT);
482 if (qe_status & CREG_STAT_ERRORS) {
483 if (qe_is_bolixed(qep, qe_status))
484 goto next;
485 }
486 if (qe_status & CREG_STAT_RXIRQ)
487 qe_rx(qep);
488 if (netif_queue_stopped(qep->dev) &&
489 (qe_status & CREG_STAT_TXIRQ)) {
490 spin_lock(&qep->lock);
491 qe_tx_reclaim(qep);
492 if (TX_BUFFS_AVAIL(qep) > 0) {
493 /* Wake net queue and return to
494 * lazy tx reclaim.
495 */
496 netif_wake_queue(qep->dev);
497 sbus_writel(1, qep->qcregs + CREG_TIMASK);
498 }
499 spin_unlock(&qep->lock);
500 }
501 next:
502 ;
503 }
504 qec_status >>= 4;
505 channel++;
506 }
507
508 return IRQ_HANDLED;
509 }
510
qe_open(struct net_device * dev)511 static int qe_open(struct net_device *dev)
512 {
513 struct sunqe *qep = netdev_priv(dev);
514
515 qep->mconfig = (MREGS_MCONFIG_TXENAB |
516 MREGS_MCONFIG_RXENAB |
517 MREGS_MCONFIG_MBAENAB);
518 return qe_init(qep, 0);
519 }
520
qe_close(struct net_device * dev)521 static int qe_close(struct net_device *dev)
522 {
523 struct sunqe *qep = netdev_priv(dev);
524
525 qe_stop(qep);
526 return 0;
527 }
528
529 /* Reclaim TX'd frames from the ring. This must always run under
530 * the IRQ protected qep->lock.
531 */
qe_tx_reclaim(struct sunqe * qep)532 static void qe_tx_reclaim(struct sunqe *qep)
533 {
534 struct qe_txd *txbase = &qep->qe_block->qe_txd[0];
535 int elem = qep->tx_old;
536
537 while (elem != qep->tx_new) {
538 u32 flags = txbase[elem].tx_flags;
539
540 if (flags & TXD_OWN)
541 break;
542 elem = NEXT_TX(elem);
543 }
544 qep->tx_old = elem;
545 }
546
qe_tx_timeout(struct net_device * dev,unsigned int txqueue)547 static void qe_tx_timeout(struct net_device *dev, unsigned int txqueue)
548 {
549 struct sunqe *qep = netdev_priv(dev);
550 int tx_full;
551
552 spin_lock_irq(&qep->lock);
553
554 /* Try to reclaim, if that frees up some tx
555 * entries, we're fine.
556 */
557 qe_tx_reclaim(qep);
558 tx_full = TX_BUFFS_AVAIL(qep) <= 0;
559
560 spin_unlock_irq(&qep->lock);
561
562 if (! tx_full)
563 goto out;
564
565 printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
566 qe_init(qep, 1);
567
568 out:
569 netif_wake_queue(dev);
570 }
571
572 /* Get a packet queued to go onto the wire. */
qe_start_xmit(struct sk_buff * skb,struct net_device * dev)573 static netdev_tx_t qe_start_xmit(struct sk_buff *skb, struct net_device *dev)
574 {
575 struct sunqe *qep = netdev_priv(dev);
576 struct sunqe_buffers *qbufs = qep->buffers;
577 __u32 txbuf_dvma, qbufs_dvma = (__u32)qep->buffers_dvma;
578 unsigned char *txbuf;
579 int len, entry;
580
581 spin_lock_irq(&qep->lock);
582
583 qe_tx_reclaim(qep);
584
585 len = skb->len;
586 entry = qep->tx_new;
587
588 txbuf = &qbufs->tx_buf[entry & (TX_RING_SIZE - 1)][0];
589 txbuf_dvma = qbufs_dvma +
590 qebuf_offset(tx_buf, (entry & (TX_RING_SIZE - 1)));
591
592 /* Avoid a race... */
593 qep->qe_block->qe_txd[entry].tx_flags = TXD_UPDATE;
594
595 skb_copy_from_linear_data(skb, txbuf, len);
596
597 qep->qe_block->qe_txd[entry].tx_addr = txbuf_dvma;
598 qep->qe_block->qe_txd[entry].tx_flags =
599 (TXD_OWN | TXD_SOP | TXD_EOP | (len & TXD_LENGTH));
600 qep->tx_new = NEXT_TX(entry);
601
602 /* Get it going. */
603 sbus_writel(CREG_CTRL_TWAKEUP, qep->qcregs + CREG_CTRL);
604
605 dev->stats.tx_packets++;
606 dev->stats.tx_bytes += len;
607
608 if (TX_BUFFS_AVAIL(qep) <= 0) {
609 /* Halt the net queue and enable tx interrupts.
610 * When the tx queue empties the tx irq handler
611 * will wake up the queue and return us back to
612 * the lazy tx reclaim scheme.
613 */
614 netif_stop_queue(dev);
615 sbus_writel(0, qep->qcregs + CREG_TIMASK);
616 }
617 spin_unlock_irq(&qep->lock);
618
619 dev_kfree_skb(skb);
620
621 return NETDEV_TX_OK;
622 }
623
qe_set_multicast(struct net_device * dev)624 static void qe_set_multicast(struct net_device *dev)
625 {
626 struct sunqe *qep = netdev_priv(dev);
627 struct netdev_hw_addr *ha;
628 u8 new_mconfig = qep->mconfig;
629 int i;
630 u32 crc;
631
632 /* Lock out others. */
633 netif_stop_queue(dev);
634
635 if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 64)) {
636 sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_LARESET,
637 qep->mregs + MREGS_IACONFIG);
638 while ((sbus_readb(qep->mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
639 barrier();
640 for (i = 0; i < 8; i++)
641 sbus_writeb(0xff, qep->mregs + MREGS_FILTER);
642 sbus_writeb(0, qep->mregs + MREGS_IACONFIG);
643 } else if (dev->flags & IFF_PROMISC) {
644 new_mconfig |= MREGS_MCONFIG_PROMISC;
645 } else {
646 u16 hash_table[4];
647 u8 *hbytes = (unsigned char *) &hash_table[0];
648
649 memset(hash_table, 0, sizeof(hash_table));
650 netdev_for_each_mc_addr(ha, dev) {
651 crc = ether_crc_le(6, ha->addr);
652 crc >>= 26;
653 hash_table[crc >> 4] |= 1 << (crc & 0xf);
654 }
655 /* Program the qe with the new filter value. */
656 sbus_writeb(MREGS_IACONFIG_ACHNGE | MREGS_IACONFIG_LARESET,
657 qep->mregs + MREGS_IACONFIG);
658 while ((sbus_readb(qep->mregs + MREGS_IACONFIG) & MREGS_IACONFIG_ACHNGE) != 0)
659 barrier();
660 for (i = 0; i < 8; i++) {
661 u8 tmp = *hbytes++;
662 sbus_writeb(tmp, qep->mregs + MREGS_FILTER);
663 }
664 sbus_writeb(0, qep->mregs + MREGS_IACONFIG);
665 }
666
667 /* Any change of the logical address filter, the physical address,
668 * or enabling/disabling promiscuous mode causes the MACE to disable
669 * the receiver. So we must re-enable them here or else the MACE
670 * refuses to listen to anything on the network. Sheesh, took
671 * me a day or two to find this bug.
672 */
673 qep->mconfig = new_mconfig;
674 sbus_writeb(qep->mconfig, qep->mregs + MREGS_MCONFIG);
675
676 /* Let us get going again. */
677 netif_wake_queue(dev);
678 }
679
680 /* Ethtool support... */
qe_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)681 static void qe_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
682 {
683 const struct linux_prom_registers *regs;
684 struct sunqe *qep = netdev_priv(dev);
685 struct platform_device *op;
686
687 strscpy(info->driver, "sunqe", sizeof(info->driver));
688 strscpy(info->version, "3.0", sizeof(info->version));
689
690 op = qep->op;
691 regs = of_get_property(op->dev.of_node, "reg", NULL);
692 if (regs)
693 snprintf(info->bus_info, sizeof(info->bus_info), "SBUS:%d",
694 regs->which_io);
695
696 }
697
qe_get_link(struct net_device * dev)698 static u32 qe_get_link(struct net_device *dev)
699 {
700 struct sunqe *qep = netdev_priv(dev);
701 void __iomem *mregs = qep->mregs;
702 u8 phyconfig;
703
704 spin_lock_irq(&qep->lock);
705 phyconfig = sbus_readb(mregs + MREGS_PHYCONFIG);
706 spin_unlock_irq(&qep->lock);
707
708 return phyconfig & MREGS_PHYCONFIG_LSTAT;
709 }
710
711 static const struct ethtool_ops qe_ethtool_ops = {
712 .get_drvinfo = qe_get_drvinfo,
713 .get_link = qe_get_link,
714 };
715
716 /* This is only called once at boot time for each card probed. */
qec_init_once(struct sunqec * qecp,struct platform_device * op)717 static void qec_init_once(struct sunqec *qecp, struct platform_device *op)
718 {
719 u8 bsizes = qecp->qec_bursts;
720
721 if (sbus_can_burst64() && (bsizes & DMA_BURST64)) {
722 sbus_writel(GLOB_CTRL_B64, qecp->gregs + GLOB_CTRL);
723 } else if (bsizes & DMA_BURST32) {
724 sbus_writel(GLOB_CTRL_B32, qecp->gregs + GLOB_CTRL);
725 } else {
726 sbus_writel(GLOB_CTRL_B16, qecp->gregs + GLOB_CTRL);
727 }
728
729 /* Packetsize only used in 100baseT BigMAC configurations,
730 * set it to zero just to be on the safe side.
731 */
732 sbus_writel(GLOB_PSIZE_2048, qecp->gregs + GLOB_PSIZE);
733
734 /* Set the local memsize register, divided up to one piece per QE channel. */
735 sbus_writel((resource_size(&op->resource[1]) >> 2),
736 qecp->gregs + GLOB_MSIZE);
737
738 /* Divide up the local QEC memory amongst the 4 QE receiver and
739 * transmitter FIFOs. Basically it is (total / 2 / num_channels).
740 */
741 sbus_writel((resource_size(&op->resource[1]) >> 2) >> 1,
742 qecp->gregs + GLOB_TSIZE);
743 sbus_writel((resource_size(&op->resource[1]) >> 2) >> 1,
744 qecp->gregs + GLOB_RSIZE);
745 }
746
qec_get_burst(struct device_node * dp)747 static u8 qec_get_burst(struct device_node *dp)
748 {
749 u8 bsizes, bsizes_more;
750
751 /* Find and set the burst sizes for the QEC, since it
752 * does the actual dma for all 4 channels.
753 */
754 bsizes = of_getintprop_default(dp, "burst-sizes", 0xff);
755 bsizes &= 0xff;
756 bsizes_more = of_getintprop_default(dp->parent, "burst-sizes", 0xff);
757
758 if (bsizes_more != 0xff)
759 bsizes &= bsizes_more;
760 if (bsizes == 0xff || (bsizes & DMA_BURST16) == 0 ||
761 (bsizes & DMA_BURST32)==0)
762 bsizes = (DMA_BURST32 - 1);
763
764 return bsizes;
765 }
766
get_qec(struct platform_device * child)767 static struct sunqec *get_qec(struct platform_device *child)
768 {
769 struct platform_device *op = to_platform_device(child->dev.parent);
770 struct sunqec *qecp;
771
772 qecp = platform_get_drvdata(op);
773 if (!qecp) {
774 qecp = kzalloc(sizeof(struct sunqec), GFP_KERNEL);
775 if (qecp) {
776 u32 ctrl;
777
778 qecp->op = op;
779 qecp->gregs = of_ioremap(&op->resource[0], 0,
780 GLOB_REG_SIZE,
781 "QEC Global Registers");
782 if (!qecp->gregs)
783 goto fail;
784
785 /* Make sure the QEC is in MACE mode. */
786 ctrl = sbus_readl(qecp->gregs + GLOB_CTRL);
787 ctrl &= 0xf0000000;
788 if (ctrl != GLOB_CTRL_MMODE) {
789 printk(KERN_ERR "qec: Not in MACE mode!\n");
790 goto fail;
791 }
792
793 if (qec_global_reset(qecp->gregs))
794 goto fail;
795
796 qecp->qec_bursts = qec_get_burst(op->dev.of_node);
797
798 qec_init_once(qecp, op);
799
800 if (request_irq(op->archdata.irqs[0], qec_interrupt,
801 IRQF_SHARED, "qec", (void *) qecp)) {
802 printk(KERN_ERR "qec: Can't register irq.\n");
803 goto fail;
804 }
805
806 platform_set_drvdata(op, qecp);
807
808 qecp->next_module = root_qec_dev;
809 root_qec_dev = qecp;
810 }
811 }
812
813 return qecp;
814
815 fail:
816 if (qecp->gregs)
817 of_iounmap(&op->resource[0], qecp->gregs, GLOB_REG_SIZE);
818 kfree(qecp);
819 return NULL;
820 }
821
822 static const struct net_device_ops qec_ops = {
823 .ndo_open = qe_open,
824 .ndo_stop = qe_close,
825 .ndo_start_xmit = qe_start_xmit,
826 .ndo_set_rx_mode = qe_set_multicast,
827 .ndo_tx_timeout = qe_tx_timeout,
828 .ndo_set_mac_address = eth_mac_addr,
829 .ndo_validate_addr = eth_validate_addr,
830 };
831
qec_ether_init(struct platform_device * op)832 static int qec_ether_init(struct platform_device *op)
833 {
834 static unsigned version_printed;
835 struct net_device *dev;
836 struct sunqec *qecp;
837 struct sunqe *qe;
838 int i, res;
839
840 if (version_printed++ == 0)
841 printk(KERN_INFO "%s", version);
842
843 dev = alloc_etherdev(sizeof(struct sunqe));
844 if (!dev)
845 return -ENOMEM;
846
847 eth_hw_addr_set(dev, idprom->id_ethaddr);
848
849 qe = netdev_priv(dev);
850
851 res = -ENODEV;
852
853 i = of_getintprop_default(op->dev.of_node, "channel#", -1);
854 if (i == -1)
855 goto fail;
856 qe->channel = i;
857 spin_lock_init(&qe->lock);
858
859 qecp = get_qec(op);
860 if (!qecp)
861 goto fail;
862
863 qecp->qes[qe->channel] = qe;
864 qe->dev = dev;
865 qe->parent = qecp;
866 qe->op = op;
867
868 res = -ENOMEM;
869 qe->qcregs = of_ioremap(&op->resource[0], 0,
870 CREG_REG_SIZE, "QEC Channel Registers");
871 if (!qe->qcregs) {
872 printk(KERN_ERR "qe: Cannot map channel registers.\n");
873 goto fail;
874 }
875
876 qe->mregs = of_ioremap(&op->resource[1], 0,
877 MREGS_REG_SIZE, "QE MACE Registers");
878 if (!qe->mregs) {
879 printk(KERN_ERR "qe: Cannot map MACE registers.\n");
880 goto fail;
881 }
882
883 qe->qe_block = dma_alloc_coherent(&op->dev, PAGE_SIZE,
884 &qe->qblock_dvma, GFP_ATOMIC);
885 qe->buffers = dma_alloc_coherent(&op->dev, sizeof(struct sunqe_buffers),
886 &qe->buffers_dvma, GFP_ATOMIC);
887 if (qe->qe_block == NULL || qe->qblock_dvma == 0 ||
888 qe->buffers == NULL || qe->buffers_dvma == 0)
889 goto fail;
890
891 /* Stop this QE. */
892 qe_stop(qe);
893
894 SET_NETDEV_DEV(dev, &op->dev);
895
896 dev->watchdog_timeo = 5*HZ;
897 dev->irq = op->archdata.irqs[0];
898 dev->dma = 0;
899 dev->ethtool_ops = &qe_ethtool_ops;
900 dev->netdev_ops = &qec_ops;
901
902 res = register_netdev(dev);
903 if (res)
904 goto fail;
905
906 platform_set_drvdata(op, qe);
907
908 printk(KERN_INFO "%s: qe channel[%d] %pM\n", dev->name, qe->channel,
909 dev->dev_addr);
910 return 0;
911
912 fail:
913 if (qe->qcregs)
914 of_iounmap(&op->resource[0], qe->qcregs, CREG_REG_SIZE);
915 if (qe->mregs)
916 of_iounmap(&op->resource[1], qe->mregs, MREGS_REG_SIZE);
917 if (qe->qe_block)
918 dma_free_coherent(&op->dev, PAGE_SIZE,
919 qe->qe_block, qe->qblock_dvma);
920 if (qe->buffers)
921 dma_free_coherent(&op->dev,
922 sizeof(struct sunqe_buffers),
923 qe->buffers,
924 qe->buffers_dvma);
925
926 free_netdev(dev);
927
928 return res;
929 }
930
qec_sbus_probe(struct platform_device * op)931 static int qec_sbus_probe(struct platform_device *op)
932 {
933 return qec_ether_init(op);
934 }
935
qec_sbus_remove(struct platform_device * op)936 static int qec_sbus_remove(struct platform_device *op)
937 {
938 struct sunqe *qp = platform_get_drvdata(op);
939 struct net_device *net_dev = qp->dev;
940
941 unregister_netdev(net_dev);
942
943 of_iounmap(&op->resource[0], qp->qcregs, CREG_REG_SIZE);
944 of_iounmap(&op->resource[1], qp->mregs, MREGS_REG_SIZE);
945 dma_free_coherent(&op->dev, PAGE_SIZE,
946 qp->qe_block, qp->qblock_dvma);
947 dma_free_coherent(&op->dev, sizeof(struct sunqe_buffers),
948 qp->buffers, qp->buffers_dvma);
949
950 free_netdev(net_dev);
951
952 return 0;
953 }
954
955 static const struct of_device_id qec_sbus_match[] = {
956 {
957 .name = "qe",
958 },
959 {},
960 };
961
962 MODULE_DEVICE_TABLE(of, qec_sbus_match);
963
964 static struct platform_driver qec_sbus_driver = {
965 .driver = {
966 .name = "qec",
967 .of_match_table = qec_sbus_match,
968 },
969 .probe = qec_sbus_probe,
970 .remove = qec_sbus_remove,
971 };
972
qec_init(void)973 static int __init qec_init(void)
974 {
975 return platform_driver_register(&qec_sbus_driver);
976 }
977
qec_exit(void)978 static void __exit qec_exit(void)
979 {
980 platform_driver_unregister(&qec_sbus_driver);
981
982 while (root_qec_dev) {
983 struct sunqec *next = root_qec_dev->next_module;
984 struct platform_device *op = root_qec_dev->op;
985
986 free_irq(op->archdata.irqs[0], (void *) root_qec_dev);
987 of_iounmap(&op->resource[0], root_qec_dev->gregs,
988 GLOB_REG_SIZE);
989 kfree(root_qec_dev);
990
991 root_qec_dev = next;
992 }
993 }
994
995 module_init(qec_init);
996 module_exit(qec_exit);
997