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Merge tag 'batman-adv-for-davem' of git://git.open-mesh.org/linux-merge
[deliverable/linux.git] / drivers / net / wireless / libertas / if_sdio.c
1 /*
2 * linux/drivers/net/wireless/libertas/if_sdio.c
3 *
4 * Copyright 2007-2008 Pierre Ossman
5 *
6 * Inspired by if_cs.c, Copyright 2007 Holger Schurig
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or (at
11 * your option) any later version.
12 *
13 * This hardware has more or less no CMD53 support, so all registers
14 * must be accessed using sdio_readb()/sdio_writeb().
15 *
16 * Transfers must be in one transaction or the firmware goes bonkers.
17 * This means that the transfer must either be small enough to do a
18 * byte based transfer or it must be padded to a multiple of the
19 * current block size.
20 *
21 * As SDIO is still new to the kernel, it is unfortunately common with
22 * bugs in the host controllers related to that. One such bug is that
23 * controllers cannot do transfers that aren't a multiple of 4 bytes.
24 * If you don't have time to fix the host controller driver, you can
25 * work around the problem by modifying if_sdio_host_to_card() and
26 * if_sdio_card_to_host() to pad the data.
27 */
28
29 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/slab.h>
34 #include <linux/firmware.h>
35 #include <linux/netdevice.h>
36 #include <linux/delay.h>
37 #include <linux/mmc/card.h>
38 #include <linux/mmc/sdio_func.h>
39 #include <linux/mmc/sdio_ids.h>
40 #include <linux/mmc/sdio.h>
41 #include <linux/mmc/host.h>
42 #include <linux/pm_runtime.h>
43
44 #include "host.h"
45 #include "decl.h"
46 #include "defs.h"
47 #include "dev.h"
48 #include "cmd.h"
49 #include "if_sdio.h"
50
51 static void if_sdio_interrupt(struct sdio_func *func);
52
53 /* The if_sdio_remove() callback function is called when
54 * user removes this module from kernel space or ejects
55 * the card from the slot. The driver handles these 2 cases
56 * differently for SD8688 combo chip.
57 * If the user is removing the module, the FUNC_SHUTDOWN
58 * command for SD8688 is sent to the firmware.
59 * If the card is removed, there is no need to send this command.
60 *
61 * The variable 'user_rmmod' is used to distinguish these two
62 * scenarios. This flag is initialized as FALSE in case the card
63 * is removed, and will be set to TRUE for module removal when
64 * module_exit function is called.
65 */
66 static u8 user_rmmod;
67
68 static char *lbs_helper_name = NULL;
69 module_param_named(helper_name, lbs_helper_name, charp, 0644);
70
71 static char *lbs_fw_name = NULL;
72 module_param_named(fw_name, lbs_fw_name, charp, 0644);
73
74 static const struct sdio_device_id if_sdio_ids[] = {
75 { SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL,
76 SDIO_DEVICE_ID_MARVELL_LIBERTAS) },
77 { SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL,
78 SDIO_DEVICE_ID_MARVELL_8688WLAN) },
79 { /* end: all zeroes */ },
80 };
81
82 MODULE_DEVICE_TABLE(sdio, if_sdio_ids);
83
84 #define MODEL_8385 0x04
85 #define MODEL_8686 0x0b
86 #define MODEL_8688 0x10
87
88 static const struct lbs_fw_table fw_table[] = {
89 { MODEL_8385, "libertas/sd8385_helper.bin", "libertas/sd8385.bin" },
90 { MODEL_8385, "sd8385_helper.bin", "sd8385.bin" },
91 { MODEL_8686, "libertas/sd8686_v9_helper.bin", "libertas/sd8686_v9.bin" },
92 { MODEL_8686, "libertas/sd8686_v8_helper.bin", "libertas/sd8686_v8.bin" },
93 { MODEL_8686, "sd8686_helper.bin", "sd8686.bin" },
94 { MODEL_8688, "libertas/sd8688_helper.bin", "libertas/sd8688.bin" },
95 { MODEL_8688, "sd8688_helper.bin", "sd8688.bin" },
96 { 0, NULL, NULL }
97 };
98 MODULE_FIRMWARE("libertas/sd8385_helper.bin");
99 MODULE_FIRMWARE("libertas/sd8385.bin");
100 MODULE_FIRMWARE("sd8385_helper.bin");
101 MODULE_FIRMWARE("sd8385.bin");
102 MODULE_FIRMWARE("libertas/sd8686_v9_helper.bin");
103 MODULE_FIRMWARE("libertas/sd8686_v9.bin");
104 MODULE_FIRMWARE("libertas/sd8686_v8_helper.bin");
105 MODULE_FIRMWARE("libertas/sd8686_v8.bin");
106 MODULE_FIRMWARE("sd8686_helper.bin");
107 MODULE_FIRMWARE("sd8686.bin");
108 MODULE_FIRMWARE("libertas/sd8688_helper.bin");
109 MODULE_FIRMWARE("libertas/sd8688.bin");
110 MODULE_FIRMWARE("sd8688_helper.bin");
111 MODULE_FIRMWARE("sd8688.bin");
112
113 struct if_sdio_packet {
114 struct if_sdio_packet *next;
115 u16 nb;
116 u8 buffer[0] __attribute__((aligned(4)));
117 };
118
119 struct if_sdio_card {
120 struct sdio_func *func;
121 struct lbs_private *priv;
122
123 int model;
124 unsigned long ioport;
125 unsigned int scratch_reg;
126
127 const char *helper;
128 const char *firmware;
129 bool helper_allocated;
130 bool firmware_allocated;
131
132 u8 buffer[65536] __attribute__((aligned(4)));
133
134 spinlock_t lock;
135 struct if_sdio_packet *packets;
136
137 struct workqueue_struct *workqueue;
138 struct work_struct packet_worker;
139
140 u8 rx_unit;
141 };
142
143 /********************************************************************/
144 /* I/O */
145 /********************************************************************/
146
147 /*
148 * For SD8385/SD8686, this function reads firmware status after
149 * the image is downloaded, or reads RX packet length when
150 * interrupt (with IF_SDIO_H_INT_UPLD bit set) is received.
151 * For SD8688, this function reads firmware status only.
152 */
153 static u16 if_sdio_read_scratch(struct if_sdio_card *card, int *err)
154 {
155 int ret;
156 u16 scratch;
157
158 scratch = sdio_readb(card->func, card->scratch_reg, &ret);
159 if (!ret)
160 scratch |= sdio_readb(card->func, card->scratch_reg + 1,
161 &ret) << 8;
162
163 if (err)
164 *err = ret;
165
166 if (ret)
167 return 0xffff;
168
169 return scratch;
170 }
171
172 static u8 if_sdio_read_rx_unit(struct if_sdio_card *card)
173 {
174 int ret;
175 u8 rx_unit;
176
177 rx_unit = sdio_readb(card->func, IF_SDIO_RX_UNIT, &ret);
178
179 if (ret)
180 rx_unit = 0;
181
182 return rx_unit;
183 }
184
185 static u16 if_sdio_read_rx_len(struct if_sdio_card *card, int *err)
186 {
187 int ret;
188 u16 rx_len;
189
190 switch (card->model) {
191 case MODEL_8385:
192 case MODEL_8686:
193 rx_len = if_sdio_read_scratch(card, &ret);
194 break;
195 case MODEL_8688:
196 default: /* for newer chipsets */
197 rx_len = sdio_readb(card->func, IF_SDIO_RX_LEN, &ret);
198 if (!ret)
199 rx_len <<= card->rx_unit;
200 else
201 rx_len = 0xffff; /* invalid length */
202
203 break;
204 }
205
206 if (err)
207 *err = ret;
208
209 return rx_len;
210 }
211
212 static int if_sdio_handle_cmd(struct if_sdio_card *card,
213 u8 *buffer, unsigned size)
214 {
215 struct lbs_private *priv = card->priv;
216 int ret;
217 unsigned long flags;
218 u8 i;
219
220 lbs_deb_enter(LBS_DEB_SDIO);
221
222 if (size > LBS_CMD_BUFFER_SIZE) {
223 lbs_deb_sdio("response packet too large (%d bytes)\n",
224 (int)size);
225 ret = -E2BIG;
226 goto out;
227 }
228
229 spin_lock_irqsave(&priv->driver_lock, flags);
230
231 i = (priv->resp_idx == 0) ? 1 : 0;
232 BUG_ON(priv->resp_len[i]);
233 priv->resp_len[i] = size;
234 memcpy(priv->resp_buf[i], buffer, size);
235 lbs_notify_command_response(priv, i);
236
237 spin_unlock_irqrestore(&card->priv->driver_lock, flags);
238
239 ret = 0;
240
241 out:
242 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
243 return ret;
244 }
245
246 static int if_sdio_handle_data(struct if_sdio_card *card,
247 u8 *buffer, unsigned size)
248 {
249 int ret;
250 struct sk_buff *skb;
251 char *data;
252
253 lbs_deb_enter(LBS_DEB_SDIO);
254
255 if (size > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
256 lbs_deb_sdio("response packet too large (%d bytes)\n",
257 (int)size);
258 ret = -E2BIG;
259 goto out;
260 }
261
262 skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE + NET_IP_ALIGN);
263 if (!skb) {
264 ret = -ENOMEM;
265 goto out;
266 }
267
268 skb_reserve(skb, NET_IP_ALIGN);
269
270 data = skb_put(skb, size);
271
272 memcpy(data, buffer, size);
273
274 lbs_process_rxed_packet(card->priv, skb);
275
276 ret = 0;
277
278 out:
279 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
280
281 return ret;
282 }
283
284 static int if_sdio_handle_event(struct if_sdio_card *card,
285 u8 *buffer, unsigned size)
286 {
287 int ret;
288 u32 event;
289
290 lbs_deb_enter(LBS_DEB_SDIO);
291
292 if (card->model == MODEL_8385) {
293 event = sdio_readb(card->func, IF_SDIO_EVENT, &ret);
294 if (ret)
295 goto out;
296
297 /* right shift 3 bits to get the event id */
298 event >>= 3;
299 } else {
300 if (size < 4) {
301 lbs_deb_sdio("event packet too small (%d bytes)\n",
302 (int)size);
303 ret = -EINVAL;
304 goto out;
305 }
306 event = buffer[3] << 24;
307 event |= buffer[2] << 16;
308 event |= buffer[1] << 8;
309 event |= buffer[0] << 0;
310 }
311
312 lbs_queue_event(card->priv, event & 0xFF);
313 ret = 0;
314
315 out:
316 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
317
318 return ret;
319 }
320
321 static int if_sdio_wait_status(struct if_sdio_card *card, const u8 condition)
322 {
323 u8 status;
324 unsigned long timeout;
325 int ret = 0;
326
327 timeout = jiffies + HZ;
328 while (1) {
329 status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
330 if (ret)
331 return ret;
332 if ((status & condition) == condition)
333 break;
334 if (time_after(jiffies, timeout))
335 return -ETIMEDOUT;
336 mdelay(1);
337 }
338 return ret;
339 }
340
341 static int if_sdio_card_to_host(struct if_sdio_card *card)
342 {
343 int ret;
344 u16 size, type, chunk;
345
346 lbs_deb_enter(LBS_DEB_SDIO);
347
348 size = if_sdio_read_rx_len(card, &ret);
349 if (ret)
350 goto out;
351
352 if (size < 4) {
353 lbs_deb_sdio("invalid packet size (%d bytes) from firmware\n",
354 (int)size);
355 ret = -EINVAL;
356 goto out;
357 }
358
359 ret = if_sdio_wait_status(card, IF_SDIO_IO_RDY);
360 if (ret)
361 goto out;
362
363 /*
364 * The transfer must be in one transaction or the firmware
365 * goes suicidal. There's no way to guarantee that for all
366 * controllers, but we can at least try.
367 */
368 chunk = sdio_align_size(card->func, size);
369
370 ret = sdio_readsb(card->func, card->buffer, card->ioport, chunk);
371 if (ret)
372 goto out;
373
374 chunk = card->buffer[0] | (card->buffer[1] << 8);
375 type = card->buffer[2] | (card->buffer[3] << 8);
376
377 lbs_deb_sdio("packet of type %d and size %d bytes\n",
378 (int)type, (int)chunk);
379
380 if (chunk > size) {
381 lbs_deb_sdio("packet fragment (%d > %d)\n",
382 (int)chunk, (int)size);
383 ret = -EINVAL;
384 goto out;
385 }
386
387 if (chunk < size) {
388 lbs_deb_sdio("packet fragment (%d < %d)\n",
389 (int)chunk, (int)size);
390 }
391
392 switch (type) {
393 case MVMS_CMD:
394 ret = if_sdio_handle_cmd(card, card->buffer + 4, chunk - 4);
395 if (ret)
396 goto out;
397 break;
398 case MVMS_DAT:
399 ret = if_sdio_handle_data(card, card->buffer + 4, chunk - 4);
400 if (ret)
401 goto out;
402 break;
403 case MVMS_EVENT:
404 ret = if_sdio_handle_event(card, card->buffer + 4, chunk - 4);
405 if (ret)
406 goto out;
407 break;
408 default:
409 lbs_deb_sdio("invalid type (%d) from firmware\n",
410 (int)type);
411 ret = -EINVAL;
412 goto out;
413 }
414
415 out:
416 if (ret)
417 pr_err("problem fetching packet from firmware\n");
418
419 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
420
421 return ret;
422 }
423
424 static void if_sdio_host_to_card_worker(struct work_struct *work)
425 {
426 struct if_sdio_card *card;
427 struct if_sdio_packet *packet;
428 int ret;
429 unsigned long flags;
430
431 lbs_deb_enter(LBS_DEB_SDIO);
432
433 card = container_of(work, struct if_sdio_card, packet_worker);
434
435 while (1) {
436 spin_lock_irqsave(&card->lock, flags);
437 packet = card->packets;
438 if (packet)
439 card->packets = packet->next;
440 spin_unlock_irqrestore(&card->lock, flags);
441
442 if (!packet)
443 break;
444
445 sdio_claim_host(card->func);
446
447 ret = if_sdio_wait_status(card, IF_SDIO_IO_RDY);
448 if (ret == 0) {
449 ret = sdio_writesb(card->func, card->ioport,
450 packet->buffer, packet->nb);
451 }
452
453 if (ret)
454 pr_err("error %d sending packet to firmware\n", ret);
455
456 sdio_release_host(card->func);
457
458 kfree(packet);
459 }
460
461 lbs_deb_leave(LBS_DEB_SDIO);
462 }
463
464 /********************************************************************/
465 /* Firmware */
466 /********************************************************************/
467
468 #define FW_DL_READY_STATUS (IF_SDIO_IO_RDY | IF_SDIO_DL_RDY)
469
470 static int if_sdio_prog_helper(struct if_sdio_card *card,
471 const struct firmware *fw)
472 {
473 int ret;
474 unsigned long timeout;
475 u8 *chunk_buffer;
476 u32 chunk_size;
477 const u8 *firmware;
478 size_t size;
479
480 lbs_deb_enter(LBS_DEB_SDIO);
481
482 chunk_buffer = kzalloc(64, GFP_KERNEL);
483 if (!chunk_buffer) {
484 ret = -ENOMEM;
485 goto out;
486 }
487
488 sdio_claim_host(card->func);
489
490 ret = sdio_set_block_size(card->func, 32);
491 if (ret)
492 goto release;
493
494 firmware = fw->data;
495 size = fw->size;
496
497 while (size) {
498 ret = if_sdio_wait_status(card, FW_DL_READY_STATUS);
499 if (ret)
500 goto release;
501
502 /* On some platforms (like Davinci) the chip needs more time
503 * between helper blocks.
504 */
505 mdelay(2);
506
507 chunk_size = min(size, (size_t)60);
508
509 *((__le32*)chunk_buffer) = cpu_to_le32(chunk_size);
510 memcpy(chunk_buffer + 4, firmware, chunk_size);
511 /*
512 lbs_deb_sdio("sending %d bytes chunk\n", chunk_size);
513 */
514 ret = sdio_writesb(card->func, card->ioport,
515 chunk_buffer, 64);
516 if (ret)
517 goto release;
518
519 firmware += chunk_size;
520 size -= chunk_size;
521 }
522
523 /* an empty block marks the end of the transfer */
524 memset(chunk_buffer, 0, 4);
525 ret = sdio_writesb(card->func, card->ioport, chunk_buffer, 64);
526 if (ret)
527 goto release;
528
529 lbs_deb_sdio("waiting for helper to boot...\n");
530
531 /* wait for the helper to boot by looking at the size register */
532 timeout = jiffies + HZ;
533 while (1) {
534 u16 req_size;
535
536 req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret);
537 if (ret)
538 goto release;
539
540 req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8;
541 if (ret)
542 goto release;
543
544 if (req_size != 0)
545 break;
546
547 if (time_after(jiffies, timeout)) {
548 ret = -ETIMEDOUT;
549 goto release;
550 }
551
552 msleep(10);
553 }
554
555 ret = 0;
556
557 release:
558 sdio_release_host(card->func);
559 kfree(chunk_buffer);
560
561 out:
562 if (ret)
563 pr_err("failed to load helper firmware\n");
564
565 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
566 return ret;
567 }
568
569 static int if_sdio_prog_real(struct if_sdio_card *card,
570 const struct firmware *fw)
571 {
572 int ret;
573 unsigned long timeout;
574 u8 *chunk_buffer;
575 u32 chunk_size;
576 const u8 *firmware;
577 size_t size, req_size;
578
579 lbs_deb_enter(LBS_DEB_SDIO);
580
581 chunk_buffer = kzalloc(512, GFP_KERNEL);
582 if (!chunk_buffer) {
583 ret = -ENOMEM;
584 goto out;
585 }
586
587 sdio_claim_host(card->func);
588
589 ret = sdio_set_block_size(card->func, 32);
590 if (ret)
591 goto release;
592
593 firmware = fw->data;
594 size = fw->size;
595
596 while (size) {
597 ret = if_sdio_wait_status(card, FW_DL_READY_STATUS);
598 if (ret)
599 goto release;
600
601 req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret);
602 if (ret)
603 goto release;
604
605 req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8;
606 if (ret)
607 goto release;
608 /*
609 lbs_deb_sdio("firmware wants %d bytes\n", (int)req_size);
610 */
611 if (req_size == 0) {
612 lbs_deb_sdio("firmware helper gave up early\n");
613 ret = -EIO;
614 goto release;
615 }
616
617 if (req_size & 0x01) {
618 lbs_deb_sdio("firmware helper signalled error\n");
619 ret = -EIO;
620 goto release;
621 }
622
623 if (req_size > size)
624 req_size = size;
625
626 while (req_size) {
627 chunk_size = min(req_size, (size_t)512);
628
629 memcpy(chunk_buffer, firmware, chunk_size);
630 /*
631 lbs_deb_sdio("sending %d bytes (%d bytes) chunk\n",
632 chunk_size, (chunk_size + 31) / 32 * 32);
633 */
634 ret = sdio_writesb(card->func, card->ioport,
635 chunk_buffer, roundup(chunk_size, 32));
636 if (ret)
637 goto release;
638
639 firmware += chunk_size;
640 size -= chunk_size;
641 req_size -= chunk_size;
642 }
643 }
644
645 ret = 0;
646
647 lbs_deb_sdio("waiting for firmware to boot...\n");
648
649 /* wait for the firmware to boot */
650 timeout = jiffies + HZ;
651 while (1) {
652 u16 scratch;
653
654 scratch = if_sdio_read_scratch(card, &ret);
655 if (ret)
656 goto release;
657
658 if (scratch == IF_SDIO_FIRMWARE_OK)
659 break;
660
661 if (time_after(jiffies, timeout)) {
662 ret = -ETIMEDOUT;
663 goto release;
664 }
665
666 msleep(10);
667 }
668
669 ret = 0;
670
671 release:
672 sdio_release_host(card->func);
673 kfree(chunk_buffer);
674
675 out:
676 if (ret)
677 pr_err("failed to load firmware\n");
678
679 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
680 return ret;
681 }
682
683 static int if_sdio_prog_firmware(struct if_sdio_card *card)
684 {
685 int ret;
686 u16 scratch;
687 const struct firmware *helper = NULL;
688 const struct firmware *mainfw = NULL;
689
690 lbs_deb_enter(LBS_DEB_SDIO);
691
692 /*
693 * Disable interrupts
694 */
695 sdio_claim_host(card->func);
696 sdio_writeb(card->func, 0x00, IF_SDIO_H_INT_MASK, &ret);
697 sdio_release_host(card->func);
698
699 sdio_claim_host(card->func);
700 scratch = if_sdio_read_scratch(card, &ret);
701 sdio_release_host(card->func);
702
703 lbs_deb_sdio("firmware status = %#x\n", scratch);
704 lbs_deb_sdio("scratch ret = %d\n", ret);
705
706 if (ret)
707 goto out;
708
709
710 /*
711 * The manual clearly describes that FEDC is the right code to use
712 * to detect firmware presence, but for SD8686 it is not that simple.
713 * Scratch is also used to store the RX packet length, so we lose
714 * the FEDC value early on. So we use a non-zero check in order
715 * to validate firmware presence.
716 * Additionally, the SD8686 in the Gumstix always has the high scratch
717 * bit set, even when the firmware is not loaded. So we have to
718 * exclude that from the test.
719 */
720 if (scratch == IF_SDIO_FIRMWARE_OK) {
721 lbs_deb_sdio("firmware already loaded\n");
722 goto success;
723 } else if ((card->model == MODEL_8686) && (scratch & 0x7fff)) {
724 lbs_deb_sdio("firmware may be running\n");
725 goto success;
726 }
727
728 ret = lbs_get_firmware(&card->func->dev, lbs_helper_name, lbs_fw_name,
729 card->model, &fw_table[0], &helper, &mainfw);
730 if (ret) {
731 pr_err("failed to find firmware (%d)\n", ret);
732 goto out;
733 }
734
735 ret = if_sdio_prog_helper(card, helper);
736 if (ret)
737 goto out;
738
739 lbs_deb_sdio("Helper firmware loaded\n");
740
741 ret = if_sdio_prog_real(card, mainfw);
742 if (ret)
743 goto out;
744
745 lbs_deb_sdio("Firmware loaded\n");
746
747 success:
748 sdio_claim_host(card->func);
749 sdio_set_block_size(card->func, IF_SDIO_BLOCK_SIZE);
750 sdio_release_host(card->func);
751 ret = 0;
752
753 out:
754 if (helper)
755 release_firmware(helper);
756 if (mainfw)
757 release_firmware(mainfw);
758
759 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
760 return ret;
761 }
762
763 /********************************************************************/
764 /* Power management */
765 /********************************************************************/
766
767 static int if_sdio_power_on(struct if_sdio_card *card)
768 {
769 struct sdio_func *func = card->func;
770 struct lbs_private *priv = card->priv;
771 struct mmc_host *host = func->card->host;
772 int ret;
773
774 sdio_claim_host(func);
775
776 ret = sdio_enable_func(func);
777 if (ret)
778 goto release;
779
780 /* For 1-bit transfers to the 8686 model, we need to enable the
781 * interrupt flag in the CCCR register. Set the MMC_QUIRK_LENIENT_FN0
782 * bit to allow access to non-vendor registers. */
783 if ((card->model == MODEL_8686) &&
784 (host->caps & MMC_CAP_SDIO_IRQ) &&
785 (host->ios.bus_width == MMC_BUS_WIDTH_1)) {
786 u8 reg;
787
788 func->card->quirks |= MMC_QUIRK_LENIENT_FN0;
789 reg = sdio_f0_readb(func, SDIO_CCCR_IF, &ret);
790 if (ret)
791 goto disable;
792
793 reg |= SDIO_BUS_ECSI;
794 sdio_f0_writeb(func, reg, SDIO_CCCR_IF, &ret);
795 if (ret)
796 goto disable;
797 }
798
799 card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
800 if (ret)
801 goto disable;
802
803 card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 1, &ret) << 8;
804 if (ret)
805 goto disable;
806
807 card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 2, &ret) << 16;
808 if (ret)
809 goto disable;
810
811 sdio_release_host(func);
812 ret = if_sdio_prog_firmware(card);
813 sdio_claim_host(func);
814 if (ret)
815 goto disable;
816
817 /*
818 * Get rx_unit if the chip is SD8688 or newer.
819 * SD8385 & SD8686 do not have rx_unit.
820 */
821 if ((card->model != MODEL_8385)
822 && (card->model != MODEL_8686))
823 card->rx_unit = if_sdio_read_rx_unit(card);
824 else
825 card->rx_unit = 0;
826
827 /*
828 * Set up the interrupt handler late.
829 *
830 * If we set it up earlier, the (buggy) hardware generates a spurious
831 * interrupt, even before the interrupt has been enabled, with
832 * CCCR_INTx = 0.
833 *
834 * We register the interrupt handler late so that we can handle any
835 * spurious interrupts, and also to avoid generation of that known
836 * spurious interrupt in the first place.
837 */
838 ret = sdio_claim_irq(func, if_sdio_interrupt);
839 if (ret)
840 goto disable;
841
842 /*
843 * Enable interrupts now that everything is set up
844 */
845 sdio_writeb(func, 0x0f, IF_SDIO_H_INT_MASK, &ret);
846 if (ret)
847 goto release_irq;
848
849 sdio_release_host(func);
850
851 /*
852 * FUNC_INIT is required for SD8688 WLAN/BT multiple functions
853 */
854 if (card->model == MODEL_8688) {
855 struct cmd_header cmd;
856
857 memset(&cmd, 0, sizeof(cmd));
858
859 lbs_deb_sdio("send function INIT command\n");
860 if (__lbs_cmd(priv, CMD_FUNC_INIT, &cmd, sizeof(cmd),
861 lbs_cmd_copyback, (unsigned long) &cmd))
862 netdev_alert(priv->dev, "CMD_FUNC_INIT cmd failed\n");
863 }
864
865 priv->fw_ready = 1;
866
867 return 0;
868
869 release_irq:
870 sdio_release_irq(func);
871 disable:
872 sdio_disable_func(func);
873 release:
874 sdio_release_host(func);
875 return ret;
876 }
877
878 static int if_sdio_power_off(struct if_sdio_card *card)
879 {
880 struct sdio_func *func = card->func;
881 struct lbs_private *priv = card->priv;
882
883 priv->fw_ready = 0;
884
885 sdio_claim_host(func);
886 sdio_release_irq(func);
887 sdio_disable_func(func);
888 sdio_release_host(func);
889 return 0;
890 }
891
892
893 /*******************************************************************/
894 /* Libertas callbacks */
895 /*******************************************************************/
896
897 static int if_sdio_host_to_card(struct lbs_private *priv,
898 u8 type, u8 *buf, u16 nb)
899 {
900 int ret;
901 struct if_sdio_card *card;
902 struct if_sdio_packet *packet, *cur;
903 u16 size;
904 unsigned long flags;
905
906 lbs_deb_enter_args(LBS_DEB_SDIO, "type %d, bytes %d", type, nb);
907
908 card = priv->card;
909
910 if (nb > (65536 - sizeof(struct if_sdio_packet) - 4)) {
911 ret = -EINVAL;
912 goto out;
913 }
914
915 /*
916 * The transfer must be in one transaction or the firmware
917 * goes suicidal. There's no way to guarantee that for all
918 * controllers, but we can at least try.
919 */
920 size = sdio_align_size(card->func, nb + 4);
921
922 packet = kzalloc(sizeof(struct if_sdio_packet) + size,
923 GFP_ATOMIC);
924 if (!packet) {
925 ret = -ENOMEM;
926 goto out;
927 }
928
929 packet->next = NULL;
930 packet->nb = size;
931
932 /*
933 * SDIO specific header.
934 */
935 packet->buffer[0] = (nb + 4) & 0xff;
936 packet->buffer[1] = ((nb + 4) >> 8) & 0xff;
937 packet->buffer[2] = type;
938 packet->buffer[3] = 0;
939
940 memcpy(packet->buffer + 4, buf, nb);
941
942 spin_lock_irqsave(&card->lock, flags);
943
944 if (!card->packets)
945 card->packets = packet;
946 else {
947 cur = card->packets;
948 while (cur->next)
949 cur = cur->next;
950 cur->next = packet;
951 }
952
953 switch (type) {
954 case MVMS_CMD:
955 priv->dnld_sent = DNLD_CMD_SENT;
956 break;
957 case MVMS_DAT:
958 priv->dnld_sent = DNLD_DATA_SENT;
959 break;
960 default:
961 lbs_deb_sdio("unknown packet type %d\n", (int)type);
962 }
963
964 spin_unlock_irqrestore(&card->lock, flags);
965
966 queue_work(card->workqueue, &card->packet_worker);
967
968 ret = 0;
969
970 out:
971 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
972
973 return ret;
974 }
975
976 static int if_sdio_enter_deep_sleep(struct lbs_private *priv)
977 {
978 int ret = -1;
979 struct cmd_header cmd;
980
981 memset(&cmd, 0, sizeof(cmd));
982
983 lbs_deb_sdio("send DEEP_SLEEP command\n");
984 ret = __lbs_cmd(priv, CMD_802_11_DEEP_SLEEP, &cmd, sizeof(cmd),
985 lbs_cmd_copyback, (unsigned long) &cmd);
986 if (ret)
987 netdev_err(priv->dev, "DEEP_SLEEP cmd failed\n");
988
989 mdelay(200);
990 return ret;
991 }
992
993 static int if_sdio_exit_deep_sleep(struct lbs_private *priv)
994 {
995 struct if_sdio_card *card = priv->card;
996 int ret = -1;
997
998 lbs_deb_enter(LBS_DEB_SDIO);
999 sdio_claim_host(card->func);
1000
1001 sdio_writeb(card->func, HOST_POWER_UP, CONFIGURATION_REG, &ret);
1002 if (ret)
1003 netdev_err(priv->dev, "sdio_writeb failed!\n");
1004
1005 sdio_release_host(card->func);
1006 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
1007 return ret;
1008 }
1009
1010 static int if_sdio_reset_deep_sleep_wakeup(struct lbs_private *priv)
1011 {
1012 struct if_sdio_card *card = priv->card;
1013 int ret = -1;
1014
1015 lbs_deb_enter(LBS_DEB_SDIO);
1016 sdio_claim_host(card->func);
1017
1018 sdio_writeb(card->func, 0, CONFIGURATION_REG, &ret);
1019 if (ret)
1020 netdev_err(priv->dev, "sdio_writeb failed!\n");
1021
1022 sdio_release_host(card->func);
1023 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
1024 return ret;
1025
1026 }
1027
1028 static struct mmc_host *reset_host;
1029
1030 static void if_sdio_reset_card_worker(struct work_struct *work)
1031 {
1032 /*
1033 * The actual reset operation must be run outside of lbs_thread. This
1034 * is because mmc_remove_host() will cause the device to be instantly
1035 * destroyed, and the libertas driver then needs to end lbs_thread,
1036 * leading to a deadlock.
1037 *
1038 * We run it in a workqueue totally independent from the if_sdio_card
1039 * instance for that reason.
1040 */
1041
1042 pr_info("Resetting card...");
1043 mmc_remove_host(reset_host);
1044 mmc_add_host(reset_host);
1045 }
1046 static DECLARE_WORK(card_reset_work, if_sdio_reset_card_worker);
1047
1048 static void if_sdio_reset_card(struct lbs_private *priv)
1049 {
1050 struct if_sdio_card *card = priv->card;
1051
1052 if (work_pending(&card_reset_work))
1053 return;
1054
1055 reset_host = card->func->card->host;
1056 schedule_work(&card_reset_work);
1057 }
1058
1059 static int if_sdio_power_save(struct lbs_private *priv)
1060 {
1061 struct if_sdio_card *card = priv->card;
1062 int ret;
1063
1064 flush_workqueue(card->workqueue);
1065
1066 ret = if_sdio_power_off(card);
1067
1068 /* Let runtime PM know the card is powered off */
1069 pm_runtime_put_sync(&card->func->dev);
1070
1071 return ret;
1072 }
1073
1074 static int if_sdio_power_restore(struct lbs_private *priv)
1075 {
1076 struct if_sdio_card *card = priv->card;
1077
1078 /* Make sure the card will not be powered off by runtime PM */
1079 pm_runtime_get_sync(&card->func->dev);
1080
1081 return if_sdio_power_on(card);
1082 }
1083
1084
1085 /*******************************************************************/
1086 /* SDIO callbacks */
1087 /*******************************************************************/
1088
1089 static void if_sdio_interrupt(struct sdio_func *func)
1090 {
1091 int ret;
1092 struct if_sdio_card *card;
1093 u8 cause;
1094
1095 lbs_deb_enter(LBS_DEB_SDIO);
1096
1097 card = sdio_get_drvdata(func);
1098
1099 cause = sdio_readb(card->func, IF_SDIO_H_INT_STATUS, &ret);
1100 if (ret || !cause)
1101 goto out;
1102
1103 lbs_deb_sdio("interrupt: 0x%X\n", (unsigned)cause);
1104
1105 sdio_writeb(card->func, ~cause, IF_SDIO_H_INT_STATUS, &ret);
1106 if (ret)
1107 goto out;
1108
1109 /*
1110 * Ignore the define name, this really means the card has
1111 * successfully received the command.
1112 */
1113 card->priv->is_activity_detected = 1;
1114 if (cause & IF_SDIO_H_INT_DNLD)
1115 lbs_host_to_card_done(card->priv);
1116
1117
1118 if (cause & IF_SDIO_H_INT_UPLD) {
1119 ret = if_sdio_card_to_host(card);
1120 if (ret)
1121 goto out;
1122 }
1123
1124 ret = 0;
1125
1126 out:
1127 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
1128 }
1129
1130 static int if_sdio_probe(struct sdio_func *func,
1131 const struct sdio_device_id *id)
1132 {
1133 struct if_sdio_card *card;
1134 struct lbs_private *priv;
1135 int ret, i;
1136 unsigned int model;
1137 struct if_sdio_packet *packet;
1138
1139 lbs_deb_enter(LBS_DEB_SDIO);
1140
1141 for (i = 0;i < func->card->num_info;i++) {
1142 if (sscanf(func->card->info[i],
1143 "802.11 SDIO ID: %x", &model) == 1)
1144 break;
1145 if (sscanf(func->card->info[i],
1146 "ID: %x", &model) == 1)
1147 break;
1148 if (!strcmp(func->card->info[i], "IBIS Wireless SDIO Card")) {
1149 model = MODEL_8385;
1150 break;
1151 }
1152 }
1153
1154 if (i == func->card->num_info) {
1155 pr_err("unable to identify card model\n");
1156 return -ENODEV;
1157 }
1158
1159 card = kzalloc(sizeof(struct if_sdio_card), GFP_KERNEL);
1160 if (!card)
1161 return -ENOMEM;
1162
1163 card->func = func;
1164 card->model = model;
1165
1166 switch (card->model) {
1167 case MODEL_8385:
1168 card->scratch_reg = IF_SDIO_SCRATCH_OLD;
1169 break;
1170 case MODEL_8686:
1171 card->scratch_reg = IF_SDIO_SCRATCH;
1172 break;
1173 case MODEL_8688:
1174 default: /* for newer chipsets */
1175 card->scratch_reg = IF_SDIO_FW_STATUS;
1176 break;
1177 }
1178
1179 spin_lock_init(&card->lock);
1180 card->workqueue = create_workqueue("libertas_sdio");
1181 INIT_WORK(&card->packet_worker, if_sdio_host_to_card_worker);
1182
1183 /* Check if we support this card */
1184 for (i = 0; i < ARRAY_SIZE(fw_table); i++) {
1185 if (card->model == fw_table[i].model)
1186 break;
1187 }
1188 if (i == ARRAY_SIZE(fw_table)) {
1189 pr_err("unknown card model 0x%x\n", card->model);
1190 ret = -ENODEV;
1191 goto free;
1192 }
1193
1194 sdio_set_drvdata(func, card);
1195
1196 lbs_deb_sdio("class = 0x%X, vendor = 0x%X, "
1197 "device = 0x%X, model = 0x%X, ioport = 0x%X\n",
1198 func->class, func->vendor, func->device,
1199 model, (unsigned)card->ioport);
1200
1201
1202 priv = lbs_add_card(card, &func->dev);
1203 if (!priv) {
1204 ret = -ENOMEM;
1205 goto free;
1206 }
1207
1208 card->priv = priv;
1209
1210 priv->card = card;
1211 priv->hw_host_to_card = if_sdio_host_to_card;
1212 priv->enter_deep_sleep = if_sdio_enter_deep_sleep;
1213 priv->exit_deep_sleep = if_sdio_exit_deep_sleep;
1214 priv->reset_deep_sleep_wakeup = if_sdio_reset_deep_sleep_wakeup;
1215 priv->reset_card = if_sdio_reset_card;
1216 priv->power_save = if_sdio_power_save;
1217 priv->power_restore = if_sdio_power_restore;
1218
1219 ret = if_sdio_power_on(card);
1220 if (ret)
1221 goto err_activate_card;
1222
1223 ret = lbs_start_card(priv);
1224 if_sdio_power_off(card);
1225 if (ret)
1226 goto err_activate_card;
1227
1228 /* Tell PM core that we don't need the card to be powered now */
1229 pm_runtime_put_noidle(&func->dev);
1230
1231 out:
1232 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
1233
1234 return ret;
1235
1236 err_activate_card:
1237 flush_workqueue(card->workqueue);
1238 lbs_remove_card(priv);
1239 free:
1240 destroy_workqueue(card->workqueue);
1241 while (card->packets) {
1242 packet = card->packets;
1243 card->packets = card->packets->next;
1244 kfree(packet);
1245 }
1246
1247 if (card->helper_allocated)
1248 kfree(card->helper);
1249 if (card->firmware_allocated)
1250 kfree(card->firmware);
1251 kfree(card);
1252
1253 goto out;
1254 }
1255
1256 static void if_sdio_remove(struct sdio_func *func)
1257 {
1258 struct if_sdio_card *card;
1259 struct if_sdio_packet *packet;
1260
1261 lbs_deb_enter(LBS_DEB_SDIO);
1262
1263 card = sdio_get_drvdata(func);
1264
1265 /* Undo decrement done above in if_sdio_probe */
1266 pm_runtime_get_noresume(&func->dev);
1267
1268 if (user_rmmod && (card->model == MODEL_8688)) {
1269 /*
1270 * FUNC_SHUTDOWN is required for SD8688 WLAN/BT
1271 * multiple functions
1272 */
1273 struct cmd_header cmd;
1274
1275 memset(&cmd, 0, sizeof(cmd));
1276
1277 lbs_deb_sdio("send function SHUTDOWN command\n");
1278 if (__lbs_cmd(card->priv, CMD_FUNC_SHUTDOWN,
1279 &cmd, sizeof(cmd), lbs_cmd_copyback,
1280 (unsigned long) &cmd))
1281 pr_alert("CMD_FUNC_SHUTDOWN cmd failed\n");
1282 }
1283
1284
1285 lbs_deb_sdio("call remove card\n");
1286 lbs_stop_card(card->priv);
1287 lbs_remove_card(card->priv);
1288
1289 flush_workqueue(card->workqueue);
1290 destroy_workqueue(card->workqueue);
1291
1292 while (card->packets) {
1293 packet = card->packets;
1294 card->packets = card->packets->next;
1295 kfree(packet);
1296 }
1297
1298 if (card->helper_allocated)
1299 kfree(card->helper);
1300 if (card->firmware_allocated)
1301 kfree(card->firmware);
1302 kfree(card);
1303
1304 lbs_deb_leave(LBS_DEB_SDIO);
1305 }
1306
1307 static int if_sdio_suspend(struct device *dev)
1308 {
1309 struct sdio_func *func = dev_to_sdio_func(dev);
1310 int ret;
1311 struct if_sdio_card *card = sdio_get_drvdata(func);
1312
1313 mmc_pm_flag_t flags = sdio_get_host_pm_caps(func);
1314
1315 dev_info(dev, "%s: suspend: PM flags = 0x%x\n",
1316 sdio_func_id(func), flags);
1317
1318 /* If we aren't being asked to wake on anything, we should bail out
1319 * and let the SD stack power down the card.
1320 */
1321 if (card->priv->wol_criteria == EHS_REMOVE_WAKEUP) {
1322 dev_info(dev, "Suspend without wake params -- powering down card\n");
1323 return -ENOSYS;
1324 }
1325
1326 if (!(flags & MMC_PM_KEEP_POWER)) {
1327 dev_err(dev, "%s: cannot remain alive while host is suspended\n",
1328 sdio_func_id(func));
1329 return -ENOSYS;
1330 }
1331
1332 ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER);
1333 if (ret)
1334 return ret;
1335
1336 ret = lbs_suspend(card->priv);
1337 if (ret)
1338 return ret;
1339
1340 return sdio_set_host_pm_flags(func, MMC_PM_WAKE_SDIO_IRQ);
1341 }
1342
1343 static int if_sdio_resume(struct device *dev)
1344 {
1345 struct sdio_func *func = dev_to_sdio_func(dev);
1346 struct if_sdio_card *card = sdio_get_drvdata(func);
1347 int ret;
1348
1349 dev_info(dev, "%s: resume: we're back\n", sdio_func_id(func));
1350
1351 ret = lbs_resume(card->priv);
1352
1353 return ret;
1354 }
1355
1356 static const struct dev_pm_ops if_sdio_pm_ops = {
1357 .suspend = if_sdio_suspend,
1358 .resume = if_sdio_resume,
1359 };
1360
1361 static struct sdio_driver if_sdio_driver = {
1362 .name = "libertas_sdio",
1363 .id_table = if_sdio_ids,
1364 .probe = if_sdio_probe,
1365 .remove = if_sdio_remove,
1366 .drv = {
1367 .pm = &if_sdio_pm_ops,
1368 },
1369 };
1370
1371 /*******************************************************************/
1372 /* Module functions */
1373 /*******************************************************************/
1374
1375 static int __init if_sdio_init_module(void)
1376 {
1377 int ret = 0;
1378
1379 lbs_deb_enter(LBS_DEB_SDIO);
1380
1381 printk(KERN_INFO "libertas_sdio: Libertas SDIO driver\n");
1382 printk(KERN_INFO "libertas_sdio: Copyright Pierre Ossman\n");
1383
1384 ret = sdio_register_driver(&if_sdio_driver);
1385
1386 /* Clear the flag in case user removes the card. */
1387 user_rmmod = 0;
1388
1389 lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
1390
1391 return ret;
1392 }
1393
1394 static void __exit if_sdio_exit_module(void)
1395 {
1396 lbs_deb_enter(LBS_DEB_SDIO);
1397
1398 /* Set the flag as user is removing this module. */
1399 user_rmmod = 1;
1400
1401 cancel_work_sync(&card_reset_work);
1402
1403 sdio_unregister_driver(&if_sdio_driver);
1404
1405 lbs_deb_leave(LBS_DEB_SDIO);
1406 }
1407
1408 module_init(if_sdio_init_module);
1409 module_exit(if_sdio_exit_module);
1410
1411 MODULE_DESCRIPTION("Libertas SDIO WLAN Driver");
1412 MODULE_AUTHOR("Pierre Ossman");
1413 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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