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sdhci: make workaround for timeout bug more general
[mirror_ubuntu-zesty-kernel.git] / drivers / mmc / host / sdhci.c
1 /*
2 * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface driver
3 *
4 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 *
11 * Thanks to the following companies for their support:
12 *
13 * - JMicron (hardware and technical support)
14 */
15
16 #include <linux/delay.h>
17 #include <linux/highmem.h>
18 #include <linux/io.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/scatterlist.h>
21
22 #include <linux/leds.h>
23
24 #include <linux/mmc/host.h>
25
26 #include "sdhci.h"
27
28 #define DRIVER_NAME "sdhci"
29
30 #define DBG(f, x...) \
31 pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
32
33 static unsigned int debug_quirks = 0;
34
35 static void sdhci_prepare_data(struct sdhci_host *, struct mmc_data *);
36 static void sdhci_finish_data(struct sdhci_host *);
37
38 static void sdhci_send_command(struct sdhci_host *, struct mmc_command *);
39 static void sdhci_finish_command(struct sdhci_host *);
40
41 static void sdhci_dumpregs(struct sdhci_host *host)
42 {
43 printk(KERN_DEBUG DRIVER_NAME ": ============== REGISTER DUMP ==============\n");
44
45 printk(KERN_DEBUG DRIVER_NAME ": Sys addr: 0x%08x | Version: 0x%08x\n",
46 readl(host->ioaddr + SDHCI_DMA_ADDRESS),
47 readw(host->ioaddr + SDHCI_HOST_VERSION));
48 printk(KERN_DEBUG DRIVER_NAME ": Blk size: 0x%08x | Blk cnt: 0x%08x\n",
49 readw(host->ioaddr + SDHCI_BLOCK_SIZE),
50 readw(host->ioaddr + SDHCI_BLOCK_COUNT));
51 printk(KERN_DEBUG DRIVER_NAME ": Argument: 0x%08x | Trn mode: 0x%08x\n",
52 readl(host->ioaddr + SDHCI_ARGUMENT),
53 readw(host->ioaddr + SDHCI_TRANSFER_MODE));
54 printk(KERN_DEBUG DRIVER_NAME ": Present: 0x%08x | Host ctl: 0x%08x\n",
55 readl(host->ioaddr + SDHCI_PRESENT_STATE),
56 readb(host->ioaddr + SDHCI_HOST_CONTROL));
57 printk(KERN_DEBUG DRIVER_NAME ": Power: 0x%08x | Blk gap: 0x%08x\n",
58 readb(host->ioaddr + SDHCI_POWER_CONTROL),
59 readb(host->ioaddr + SDHCI_BLOCK_GAP_CONTROL));
60 printk(KERN_DEBUG DRIVER_NAME ": Wake-up: 0x%08x | Clock: 0x%08x\n",
61 readb(host->ioaddr + SDHCI_WAKE_UP_CONTROL),
62 readw(host->ioaddr + SDHCI_CLOCK_CONTROL));
63 printk(KERN_DEBUG DRIVER_NAME ": Timeout: 0x%08x | Int stat: 0x%08x\n",
64 readb(host->ioaddr + SDHCI_TIMEOUT_CONTROL),
65 readl(host->ioaddr + SDHCI_INT_STATUS));
66 printk(KERN_DEBUG DRIVER_NAME ": Int enab: 0x%08x | Sig enab: 0x%08x\n",
67 readl(host->ioaddr + SDHCI_INT_ENABLE),
68 readl(host->ioaddr + SDHCI_SIGNAL_ENABLE));
69 printk(KERN_DEBUG DRIVER_NAME ": AC12 err: 0x%08x | Slot int: 0x%08x\n",
70 readw(host->ioaddr + SDHCI_ACMD12_ERR),
71 readw(host->ioaddr + SDHCI_SLOT_INT_STATUS));
72 printk(KERN_DEBUG DRIVER_NAME ": Caps: 0x%08x | Max curr: 0x%08x\n",
73 readl(host->ioaddr + SDHCI_CAPABILITIES),
74 readl(host->ioaddr + SDHCI_MAX_CURRENT));
75
76 printk(KERN_DEBUG DRIVER_NAME ": ===========================================\n");
77 }
78
79 /*****************************************************************************\
80 * *
81 * Low level functions *
82 * *
83 \*****************************************************************************/
84
85 static void sdhci_reset(struct sdhci_host *host, u8 mask)
86 {
87 unsigned long timeout;
88
89 if (host->quirks & SDHCI_QUIRK_NO_CARD_NO_RESET) {
90 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
91 SDHCI_CARD_PRESENT))
92 return;
93 }
94
95 writeb(mask, host->ioaddr + SDHCI_SOFTWARE_RESET);
96
97 if (mask & SDHCI_RESET_ALL)
98 host->clock = 0;
99
100 /* Wait max 100 ms */
101 timeout = 100;
102
103 /* hw clears the bit when it's done */
104 while (readb(host->ioaddr + SDHCI_SOFTWARE_RESET) & mask) {
105 if (timeout == 0) {
106 printk(KERN_ERR "%s: Reset 0x%x never completed.\n",
107 mmc_hostname(host->mmc), (int)mask);
108 sdhci_dumpregs(host);
109 return;
110 }
111 timeout--;
112 mdelay(1);
113 }
114 }
115
116 static void sdhci_init(struct sdhci_host *host)
117 {
118 u32 intmask;
119
120 sdhci_reset(host, SDHCI_RESET_ALL);
121
122 intmask = SDHCI_INT_BUS_POWER | SDHCI_INT_DATA_END_BIT |
123 SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_TIMEOUT | SDHCI_INT_INDEX |
124 SDHCI_INT_END_BIT | SDHCI_INT_CRC | SDHCI_INT_TIMEOUT |
125 SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT |
126 SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL |
127 SDHCI_INT_DMA_END | SDHCI_INT_DATA_END | SDHCI_INT_RESPONSE;
128
129 writel(intmask, host->ioaddr + SDHCI_INT_ENABLE);
130 writel(intmask, host->ioaddr + SDHCI_SIGNAL_ENABLE);
131 }
132
133 static void sdhci_activate_led(struct sdhci_host *host)
134 {
135 u8 ctrl;
136
137 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
138 ctrl |= SDHCI_CTRL_LED;
139 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
140 }
141
142 static void sdhci_deactivate_led(struct sdhci_host *host)
143 {
144 u8 ctrl;
145
146 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
147 ctrl &= ~SDHCI_CTRL_LED;
148 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
149 }
150
151 #ifdef CONFIG_LEDS_CLASS
152 static void sdhci_led_control(struct led_classdev *led,
153 enum led_brightness brightness)
154 {
155 struct sdhci_host *host = container_of(led, struct sdhci_host, led);
156 unsigned long flags;
157
158 spin_lock_irqsave(&host->lock, flags);
159
160 if (brightness == LED_OFF)
161 sdhci_deactivate_led(host);
162 else
163 sdhci_activate_led(host);
164
165 spin_unlock_irqrestore(&host->lock, flags);
166 }
167 #endif
168
169 /*****************************************************************************\
170 * *
171 * Core functions *
172 * *
173 \*****************************************************************************/
174
175 static inline char* sdhci_sg_to_buffer(struct sdhci_host* host)
176 {
177 return sg_virt(host->cur_sg);
178 }
179
180 static inline int sdhci_next_sg(struct sdhci_host* host)
181 {
182 /*
183 * Skip to next SG entry.
184 */
185 host->cur_sg++;
186 host->num_sg--;
187
188 /*
189 * Any entries left?
190 */
191 if (host->num_sg > 0) {
192 host->offset = 0;
193 host->remain = host->cur_sg->length;
194 }
195
196 return host->num_sg;
197 }
198
199 static void sdhci_read_block_pio(struct sdhci_host *host)
200 {
201 int blksize, chunk_remain;
202 u32 data;
203 char *buffer;
204 int size;
205
206 DBG("PIO reading\n");
207
208 blksize = host->data->blksz;
209 chunk_remain = 0;
210 data = 0;
211
212 buffer = sdhci_sg_to_buffer(host) + host->offset;
213
214 while (blksize) {
215 if (chunk_remain == 0) {
216 data = readl(host->ioaddr + SDHCI_BUFFER);
217 chunk_remain = min(blksize, 4);
218 }
219
220 size = min(host->remain, chunk_remain);
221
222 chunk_remain -= size;
223 blksize -= size;
224 host->offset += size;
225 host->remain -= size;
226
227 while (size) {
228 *buffer = data & 0xFF;
229 buffer++;
230 data >>= 8;
231 size--;
232 }
233
234 if (host->remain == 0) {
235 if (sdhci_next_sg(host) == 0) {
236 BUG_ON(blksize != 0);
237 return;
238 }
239 buffer = sdhci_sg_to_buffer(host);
240 }
241 }
242 }
243
244 static void sdhci_write_block_pio(struct sdhci_host *host)
245 {
246 int blksize, chunk_remain;
247 u32 data;
248 char *buffer;
249 int bytes, size;
250
251 DBG("PIO writing\n");
252
253 blksize = host->data->blksz;
254 chunk_remain = 4;
255 data = 0;
256
257 bytes = 0;
258 buffer = sdhci_sg_to_buffer(host) + host->offset;
259
260 while (blksize) {
261 size = min(host->remain, chunk_remain);
262
263 chunk_remain -= size;
264 blksize -= size;
265 host->offset += size;
266 host->remain -= size;
267
268 while (size) {
269 data >>= 8;
270 data |= (u32)*buffer << 24;
271 buffer++;
272 size--;
273 }
274
275 if (chunk_remain == 0) {
276 writel(data, host->ioaddr + SDHCI_BUFFER);
277 chunk_remain = min(blksize, 4);
278 }
279
280 if (host->remain == 0) {
281 if (sdhci_next_sg(host) == 0) {
282 BUG_ON(blksize != 0);
283 return;
284 }
285 buffer = sdhci_sg_to_buffer(host);
286 }
287 }
288 }
289
290 static void sdhci_transfer_pio(struct sdhci_host *host)
291 {
292 u32 mask;
293
294 BUG_ON(!host->data);
295
296 if (host->num_sg == 0)
297 return;
298
299 if (host->data->flags & MMC_DATA_READ)
300 mask = SDHCI_DATA_AVAILABLE;
301 else
302 mask = SDHCI_SPACE_AVAILABLE;
303
304 while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
305 if (host->data->flags & MMC_DATA_READ)
306 sdhci_read_block_pio(host);
307 else
308 sdhci_write_block_pio(host);
309
310 if (host->num_sg == 0)
311 break;
312 }
313
314 DBG("PIO transfer complete.\n");
315 }
316
317 static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_data *data)
318 {
319 u8 count;
320 unsigned target_timeout, current_timeout;
321
322 /*
323 * If the host controller provides us with an incorrect timeout
324 * value, just skip the check and use 0xE. The hardware may take
325 * longer to time out, but that's much better than having a too-short
326 * timeout value.
327 */
328 if ((host->quirks & SDHCI_QUIRK_BROKEN_TIMEOUT_VAL))
329 return 0xE;
330
331 /* timeout in us */
332 target_timeout = data->timeout_ns / 1000 +
333 data->timeout_clks / host->clock;
334
335 /*
336 * Figure out needed cycles.
337 * We do this in steps in order to fit inside a 32 bit int.
338 * The first step is the minimum timeout, which will have a
339 * minimum resolution of 6 bits:
340 * (1) 2^13*1000 > 2^22,
341 * (2) host->timeout_clk < 2^16
342 * =>
343 * (1) / (2) > 2^6
344 */
345 count = 0;
346 current_timeout = (1 << 13) * 1000 / host->timeout_clk;
347 while (current_timeout < target_timeout) {
348 count++;
349 current_timeout <<= 1;
350 if (count >= 0xF)
351 break;
352 }
353
354 if (count >= 0xF) {
355 printk(KERN_WARNING "%s: Too large timeout requested!\n",
356 mmc_hostname(host->mmc));
357 count = 0xE;
358 }
359
360 return count;
361 }
362
363 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
364 {
365 u8 count;
366
367 WARN_ON(host->data);
368
369 if (data == NULL)
370 return;
371
372 /* Sanity checks */
373 BUG_ON(data->blksz * data->blocks > 524288);
374 BUG_ON(data->blksz > host->mmc->max_blk_size);
375 BUG_ON(data->blocks > 65535);
376
377 host->data = data;
378 host->data_early = 0;
379
380 count = sdhci_calc_timeout(host, data);
381 writeb(count, host->ioaddr + SDHCI_TIMEOUT_CONTROL);
382
383 if (host->flags & SDHCI_USE_DMA)
384 host->flags |= SDHCI_REQ_USE_DMA;
385
386 if (unlikely((host->flags & SDHCI_REQ_USE_DMA) &&
387 (host->quirks & SDHCI_QUIRK_32BIT_DMA_SIZE) &&
388 ((data->blksz * data->blocks) & 0x3))) {
389 DBG("Reverting to PIO because of transfer size (%d)\n",
390 data->blksz * data->blocks);
391 host->flags &= ~SDHCI_REQ_USE_DMA;
392 }
393
394 /*
395 * The assumption here being that alignment is the same after
396 * translation to device address space.
397 */
398 if (unlikely((host->flags & SDHCI_REQ_USE_DMA) &&
399 (host->quirks & SDHCI_QUIRK_32BIT_DMA_ADDR) &&
400 (data->sg->offset & 0x3))) {
401 DBG("Reverting to PIO because of bad alignment\n");
402 host->flags &= ~SDHCI_REQ_USE_DMA;
403 }
404
405 if (host->flags & SDHCI_REQ_USE_DMA) {
406 int count;
407
408 count = dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
409 (data->flags & MMC_DATA_READ) ?
410 DMA_FROM_DEVICE : DMA_TO_DEVICE);
411 WARN_ON(count != 1);
412
413 writel(sg_dma_address(data->sg),
414 host->ioaddr + SDHCI_DMA_ADDRESS);
415 } else {
416 host->cur_sg = data->sg;
417 host->num_sg = data->sg_len;
418
419 host->offset = 0;
420 host->remain = host->cur_sg->length;
421 }
422
423 /* We do not handle DMA boundaries, so set it to max (512 KiB) */
424 writew(SDHCI_MAKE_BLKSZ(7, data->blksz),
425 host->ioaddr + SDHCI_BLOCK_SIZE);
426 writew(data->blocks, host->ioaddr + SDHCI_BLOCK_COUNT);
427 }
428
429 static void sdhci_set_transfer_mode(struct sdhci_host *host,
430 struct mmc_data *data)
431 {
432 u16 mode;
433
434 if (data == NULL)
435 return;
436
437 WARN_ON(!host->data);
438
439 mode = SDHCI_TRNS_BLK_CNT_EN;
440 if (data->blocks > 1)
441 mode |= SDHCI_TRNS_MULTI;
442 if (data->flags & MMC_DATA_READ)
443 mode |= SDHCI_TRNS_READ;
444 if (host->flags & SDHCI_REQ_USE_DMA)
445 mode |= SDHCI_TRNS_DMA;
446
447 writew(mode, host->ioaddr + SDHCI_TRANSFER_MODE);
448 }
449
450 static void sdhci_finish_data(struct sdhci_host *host)
451 {
452 struct mmc_data *data;
453
454 BUG_ON(!host->data);
455
456 data = host->data;
457 host->data = NULL;
458
459 if (host->flags & SDHCI_REQ_USE_DMA) {
460 dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
461 (data->flags & MMC_DATA_READ) ?
462 DMA_FROM_DEVICE : DMA_TO_DEVICE);
463 }
464
465 /*
466 * The specification states that the block count register must
467 * be updated, but it does not specify at what point in the
468 * data flow. That makes the register entirely useless to read
469 * back so we have to assume that nothing made it to the card
470 * in the event of an error.
471 */
472 if (data->error)
473 data->bytes_xfered = 0;
474 else
475 data->bytes_xfered = data->blksz * data->blocks;
476
477 if (data->stop) {
478 /*
479 * The controller needs a reset of internal state machines
480 * upon error conditions.
481 */
482 if (data->error) {
483 sdhci_reset(host, SDHCI_RESET_CMD);
484 sdhci_reset(host, SDHCI_RESET_DATA);
485 }
486
487 sdhci_send_command(host, data->stop);
488 } else
489 tasklet_schedule(&host->finish_tasklet);
490 }
491
492 static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
493 {
494 int flags;
495 u32 mask;
496 unsigned long timeout;
497
498 WARN_ON(host->cmd);
499
500 /* Wait max 10 ms */
501 timeout = 10;
502
503 mask = SDHCI_CMD_INHIBIT;
504 if ((cmd->data != NULL) || (cmd->flags & MMC_RSP_BUSY))
505 mask |= SDHCI_DATA_INHIBIT;
506
507 /* We shouldn't wait for data inihibit for stop commands, even
508 though they might use busy signaling */
509 if (host->mrq->data && (cmd == host->mrq->data->stop))
510 mask &= ~SDHCI_DATA_INHIBIT;
511
512 while (readl(host->ioaddr + SDHCI_PRESENT_STATE) & mask) {
513 if (timeout == 0) {
514 printk(KERN_ERR "%s: Controller never released "
515 "inhibit bit(s).\n", mmc_hostname(host->mmc));
516 sdhci_dumpregs(host);
517 cmd->error = -EIO;
518 tasklet_schedule(&host->finish_tasklet);
519 return;
520 }
521 timeout--;
522 mdelay(1);
523 }
524
525 mod_timer(&host->timer, jiffies + 10 * HZ);
526
527 host->cmd = cmd;
528
529 sdhci_prepare_data(host, cmd->data);
530
531 writel(cmd->arg, host->ioaddr + SDHCI_ARGUMENT);
532
533 sdhci_set_transfer_mode(host, cmd->data);
534
535 if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
536 printk(KERN_ERR "%s: Unsupported response type!\n",
537 mmc_hostname(host->mmc));
538 cmd->error = -EINVAL;
539 tasklet_schedule(&host->finish_tasklet);
540 return;
541 }
542
543 if (!(cmd->flags & MMC_RSP_PRESENT))
544 flags = SDHCI_CMD_RESP_NONE;
545 else if (cmd->flags & MMC_RSP_136)
546 flags = SDHCI_CMD_RESP_LONG;
547 else if (cmd->flags & MMC_RSP_BUSY)
548 flags = SDHCI_CMD_RESP_SHORT_BUSY;
549 else
550 flags = SDHCI_CMD_RESP_SHORT;
551
552 if (cmd->flags & MMC_RSP_CRC)
553 flags |= SDHCI_CMD_CRC;
554 if (cmd->flags & MMC_RSP_OPCODE)
555 flags |= SDHCI_CMD_INDEX;
556 if (cmd->data)
557 flags |= SDHCI_CMD_DATA;
558
559 writew(SDHCI_MAKE_CMD(cmd->opcode, flags),
560 host->ioaddr + SDHCI_COMMAND);
561 }
562
563 static void sdhci_finish_command(struct sdhci_host *host)
564 {
565 int i;
566
567 BUG_ON(host->cmd == NULL);
568
569 if (host->cmd->flags & MMC_RSP_PRESENT) {
570 if (host->cmd->flags & MMC_RSP_136) {
571 /* CRC is stripped so we need to do some shifting. */
572 for (i = 0;i < 4;i++) {
573 host->cmd->resp[i] = readl(host->ioaddr +
574 SDHCI_RESPONSE + (3-i)*4) << 8;
575 if (i != 3)
576 host->cmd->resp[i] |=
577 readb(host->ioaddr +
578 SDHCI_RESPONSE + (3-i)*4-1);
579 }
580 } else {
581 host->cmd->resp[0] = readl(host->ioaddr + SDHCI_RESPONSE);
582 }
583 }
584
585 host->cmd->error = 0;
586
587 if (host->data && host->data_early)
588 sdhci_finish_data(host);
589
590 if (!host->cmd->data)
591 tasklet_schedule(&host->finish_tasklet);
592
593 host->cmd = NULL;
594 }
595
596 static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
597 {
598 int div;
599 u16 clk;
600 unsigned long timeout;
601
602 if (clock == host->clock)
603 return;
604
605 writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
606
607 if (clock == 0)
608 goto out;
609
610 for (div = 1;div < 256;div *= 2) {
611 if ((host->max_clk / div) <= clock)
612 break;
613 }
614 div >>= 1;
615
616 clk = div << SDHCI_DIVIDER_SHIFT;
617 clk |= SDHCI_CLOCK_INT_EN;
618 writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
619
620 /* Wait max 10 ms */
621 timeout = 10;
622 while (!((clk = readw(host->ioaddr + SDHCI_CLOCK_CONTROL))
623 & SDHCI_CLOCK_INT_STABLE)) {
624 if (timeout == 0) {
625 printk(KERN_ERR "%s: Internal clock never "
626 "stabilised.\n", mmc_hostname(host->mmc));
627 sdhci_dumpregs(host);
628 return;
629 }
630 timeout--;
631 mdelay(1);
632 }
633
634 clk |= SDHCI_CLOCK_CARD_EN;
635 writew(clk, host->ioaddr + SDHCI_CLOCK_CONTROL);
636
637 out:
638 host->clock = clock;
639 }
640
641 static void sdhci_set_power(struct sdhci_host *host, unsigned short power)
642 {
643 u8 pwr;
644
645 if (host->power == power)
646 return;
647
648 if (power == (unsigned short)-1) {
649 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
650 goto out;
651 }
652
653 /*
654 * Spec says that we should clear the power reg before setting
655 * a new value. Some controllers don't seem to like this though.
656 */
657 if (!(host->quirks & SDHCI_QUIRK_SINGLE_POWER_WRITE))
658 writeb(0, host->ioaddr + SDHCI_POWER_CONTROL);
659
660 pwr = SDHCI_POWER_ON;
661
662 switch (1 << power) {
663 case MMC_VDD_165_195:
664 pwr |= SDHCI_POWER_180;
665 break;
666 case MMC_VDD_29_30:
667 case MMC_VDD_30_31:
668 pwr |= SDHCI_POWER_300;
669 break;
670 case MMC_VDD_32_33:
671 case MMC_VDD_33_34:
672 pwr |= SDHCI_POWER_330;
673 break;
674 default:
675 BUG();
676 }
677
678 /*
679 * At least the CaFe chip gets confused if we set the voltage
680 * and set turn on power at the same time, so set the voltage first.
681 */
682 if ((host->quirks & SDHCI_QUIRK_NO_SIMULT_VDD_AND_POWER))
683 writeb(pwr & ~SDHCI_POWER_ON,
684 host->ioaddr + SDHCI_POWER_CONTROL);
685
686 writeb(pwr, host->ioaddr + SDHCI_POWER_CONTROL);
687
688 out:
689 host->power = power;
690 }
691
692 /*****************************************************************************\
693 * *
694 * MMC callbacks *
695 * *
696 \*****************************************************************************/
697
698 static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
699 {
700 struct sdhci_host *host;
701 unsigned long flags;
702
703 host = mmc_priv(mmc);
704
705 spin_lock_irqsave(&host->lock, flags);
706
707 WARN_ON(host->mrq != NULL);
708
709 #ifndef CONFIG_LEDS_CLASS
710 sdhci_activate_led(host);
711 #endif
712
713 host->mrq = mrq;
714
715 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
716 host->mrq->cmd->error = -ENOMEDIUM;
717 tasklet_schedule(&host->finish_tasklet);
718 } else
719 sdhci_send_command(host, mrq->cmd);
720
721 mmiowb();
722 spin_unlock_irqrestore(&host->lock, flags);
723 }
724
725 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
726 {
727 struct sdhci_host *host;
728 unsigned long flags;
729 u8 ctrl;
730
731 host = mmc_priv(mmc);
732
733 spin_lock_irqsave(&host->lock, flags);
734
735 /*
736 * Reset the chip on each power off.
737 * Should clear out any weird states.
738 */
739 if (ios->power_mode == MMC_POWER_OFF) {
740 writel(0, host->ioaddr + SDHCI_SIGNAL_ENABLE);
741 sdhci_init(host);
742 }
743
744 sdhci_set_clock(host, ios->clock);
745
746 if (ios->power_mode == MMC_POWER_OFF)
747 sdhci_set_power(host, -1);
748 else
749 sdhci_set_power(host, ios->vdd);
750
751 ctrl = readb(host->ioaddr + SDHCI_HOST_CONTROL);
752
753 if (ios->bus_width == MMC_BUS_WIDTH_4)
754 ctrl |= SDHCI_CTRL_4BITBUS;
755 else
756 ctrl &= ~SDHCI_CTRL_4BITBUS;
757
758 if (ios->timing == MMC_TIMING_SD_HS)
759 ctrl |= SDHCI_CTRL_HISPD;
760 else
761 ctrl &= ~SDHCI_CTRL_HISPD;
762
763 writeb(ctrl, host->ioaddr + SDHCI_HOST_CONTROL);
764
765 /*
766 * Some (ENE) controllers go apeshit on some ios operation,
767 * signalling timeout and CRC errors even on CMD0. Resetting
768 * it on each ios seems to solve the problem.
769 */
770 if(host->quirks & SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS)
771 sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);
772
773 mmiowb();
774 spin_unlock_irqrestore(&host->lock, flags);
775 }
776
777 static int sdhci_get_ro(struct mmc_host *mmc)
778 {
779 struct sdhci_host *host;
780 unsigned long flags;
781 int present;
782
783 host = mmc_priv(mmc);
784
785 spin_lock_irqsave(&host->lock, flags);
786
787 present = readl(host->ioaddr + SDHCI_PRESENT_STATE);
788
789 spin_unlock_irqrestore(&host->lock, flags);
790
791 return !(present & SDHCI_WRITE_PROTECT);
792 }
793
794 static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int enable)
795 {
796 struct sdhci_host *host;
797 unsigned long flags;
798 u32 ier;
799
800 host = mmc_priv(mmc);
801
802 spin_lock_irqsave(&host->lock, flags);
803
804 ier = readl(host->ioaddr + SDHCI_INT_ENABLE);
805
806 ier &= ~SDHCI_INT_CARD_INT;
807 if (enable)
808 ier |= SDHCI_INT_CARD_INT;
809
810 writel(ier, host->ioaddr + SDHCI_INT_ENABLE);
811 writel(ier, host->ioaddr + SDHCI_SIGNAL_ENABLE);
812
813 mmiowb();
814
815 spin_unlock_irqrestore(&host->lock, flags);
816 }
817
818 static const struct mmc_host_ops sdhci_ops = {
819 .request = sdhci_request,
820 .set_ios = sdhci_set_ios,
821 .get_ro = sdhci_get_ro,
822 .enable_sdio_irq = sdhci_enable_sdio_irq,
823 };
824
825 /*****************************************************************************\
826 * *
827 * Tasklets *
828 * *
829 \*****************************************************************************/
830
831 static void sdhci_tasklet_card(unsigned long param)
832 {
833 struct sdhci_host *host;
834 unsigned long flags;
835
836 host = (struct sdhci_host*)param;
837
838 spin_lock_irqsave(&host->lock, flags);
839
840 if (!(readl(host->ioaddr + SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT)) {
841 if (host->mrq) {
842 printk(KERN_ERR "%s: Card removed during transfer!\n",
843 mmc_hostname(host->mmc));
844 printk(KERN_ERR "%s: Resetting controller.\n",
845 mmc_hostname(host->mmc));
846
847 sdhci_reset(host, SDHCI_RESET_CMD);
848 sdhci_reset(host, SDHCI_RESET_DATA);
849
850 host->mrq->cmd->error = -ENOMEDIUM;
851 tasklet_schedule(&host->finish_tasklet);
852 }
853 }
854
855 spin_unlock_irqrestore(&host->lock, flags);
856
857 mmc_detect_change(host->mmc, msecs_to_jiffies(500));
858 }
859
860 static void sdhci_tasklet_finish(unsigned long param)
861 {
862 struct sdhci_host *host;
863 unsigned long flags;
864 struct mmc_request *mrq;
865
866 host = (struct sdhci_host*)param;
867
868 spin_lock_irqsave(&host->lock, flags);
869
870 del_timer(&host->timer);
871
872 mrq = host->mrq;
873
874 /*
875 * The controller needs a reset of internal state machines
876 * upon error conditions.
877 */
878 if (mrq->cmd->error ||
879 (mrq->data && (mrq->data->error ||
880 (mrq->data->stop && mrq->data->stop->error))) ||
881 (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST)) {
882
883 /* Some controllers need this kick or reset won't work here */
884 if (host->quirks & SDHCI_QUIRK_CLOCK_BEFORE_RESET) {
885 unsigned int clock;
886
887 /* This is to force an update */
888 clock = host->clock;
889 host->clock = 0;
890 sdhci_set_clock(host, clock);
891 }
892
893 /* Spec says we should do both at the same time, but Ricoh
894 controllers do not like that. */
895 sdhci_reset(host, SDHCI_RESET_CMD);
896 sdhci_reset(host, SDHCI_RESET_DATA);
897 }
898
899 host->mrq = NULL;
900 host->cmd = NULL;
901 host->data = NULL;
902
903 #ifndef CONFIG_LEDS_CLASS
904 sdhci_deactivate_led(host);
905 #endif
906
907 mmiowb();
908 spin_unlock_irqrestore(&host->lock, flags);
909
910 mmc_request_done(host->mmc, mrq);
911 }
912
913 static void sdhci_timeout_timer(unsigned long data)
914 {
915 struct sdhci_host *host;
916 unsigned long flags;
917
918 host = (struct sdhci_host*)data;
919
920 spin_lock_irqsave(&host->lock, flags);
921
922 if (host->mrq) {
923 printk(KERN_ERR "%s: Timeout waiting for hardware "
924 "interrupt.\n", mmc_hostname(host->mmc));
925 sdhci_dumpregs(host);
926
927 if (host->data) {
928 host->data->error = -ETIMEDOUT;
929 sdhci_finish_data(host);
930 } else {
931 if (host->cmd)
932 host->cmd->error = -ETIMEDOUT;
933 else
934 host->mrq->cmd->error = -ETIMEDOUT;
935
936 tasklet_schedule(&host->finish_tasklet);
937 }
938 }
939
940 mmiowb();
941 spin_unlock_irqrestore(&host->lock, flags);
942 }
943
944 /*****************************************************************************\
945 * *
946 * Interrupt handling *
947 * *
948 \*****************************************************************************/
949
950 static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
951 {
952 BUG_ON(intmask == 0);
953
954 if (!host->cmd) {
955 printk(KERN_ERR "%s: Got command interrupt 0x%08x even "
956 "though no command operation was in progress.\n",
957 mmc_hostname(host->mmc), (unsigned)intmask);
958 sdhci_dumpregs(host);
959 return;
960 }
961
962 if (intmask & SDHCI_INT_TIMEOUT)
963 host->cmd->error = -ETIMEDOUT;
964 else if (intmask & (SDHCI_INT_CRC | SDHCI_INT_END_BIT |
965 SDHCI_INT_INDEX))
966 host->cmd->error = -EILSEQ;
967
968 if (host->cmd->error)
969 tasklet_schedule(&host->finish_tasklet);
970 else if (intmask & SDHCI_INT_RESPONSE)
971 sdhci_finish_command(host);
972 }
973
974 static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
975 {
976 BUG_ON(intmask == 0);
977
978 if (!host->data) {
979 /*
980 * A data end interrupt is sent together with the response
981 * for the stop command.
982 */
983 if (intmask & SDHCI_INT_DATA_END)
984 return;
985
986 printk(KERN_ERR "%s: Got data interrupt 0x%08x even "
987 "though no data operation was in progress.\n",
988 mmc_hostname(host->mmc), (unsigned)intmask);
989 sdhci_dumpregs(host);
990
991 return;
992 }
993
994 if (intmask & SDHCI_INT_DATA_TIMEOUT)
995 host->data->error = -ETIMEDOUT;
996 else if (intmask & (SDHCI_INT_DATA_CRC | SDHCI_INT_DATA_END_BIT))
997 host->data->error = -EILSEQ;
998
999 if (host->data->error)
1000 sdhci_finish_data(host);
1001 else {
1002 if (intmask & (SDHCI_INT_DATA_AVAIL | SDHCI_INT_SPACE_AVAIL))
1003 sdhci_transfer_pio(host);
1004
1005 /*
1006 * We currently don't do anything fancy with DMA
1007 * boundaries, but as we can't disable the feature
1008 * we need to at least restart the transfer.
1009 */
1010 if (intmask & SDHCI_INT_DMA_END)
1011 writel(readl(host->ioaddr + SDHCI_DMA_ADDRESS),
1012 host->ioaddr + SDHCI_DMA_ADDRESS);
1013
1014 if (intmask & SDHCI_INT_DATA_END) {
1015 if (host->cmd) {
1016 /*
1017 * Data managed to finish before the
1018 * command completed. Make sure we do
1019 * things in the proper order.
1020 */
1021 host->data_early = 1;
1022 } else {
1023 sdhci_finish_data(host);
1024 }
1025 }
1026 }
1027 }
1028
1029 static irqreturn_t sdhci_irq(int irq, void *dev_id)
1030 {
1031 irqreturn_t result;
1032 struct sdhci_host* host = dev_id;
1033 u32 intmask;
1034 int cardint = 0;
1035
1036 spin_lock(&host->lock);
1037
1038 intmask = readl(host->ioaddr + SDHCI_INT_STATUS);
1039
1040 if (!intmask || intmask == 0xffffffff) {
1041 result = IRQ_NONE;
1042 goto out;
1043 }
1044
1045 DBG("*** %s got interrupt: 0x%08x\n",
1046 mmc_hostname(host->mmc), intmask);
1047
1048 if (intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE)) {
1049 writel(intmask & (SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE),
1050 host->ioaddr + SDHCI_INT_STATUS);
1051 tasklet_schedule(&host->card_tasklet);
1052 }
1053
1054 intmask &= ~(SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE);
1055
1056 if (intmask & SDHCI_INT_CMD_MASK) {
1057 writel(intmask & SDHCI_INT_CMD_MASK,
1058 host->ioaddr + SDHCI_INT_STATUS);
1059 sdhci_cmd_irq(host, intmask & SDHCI_INT_CMD_MASK);
1060 }
1061
1062 if (intmask & SDHCI_INT_DATA_MASK) {
1063 writel(intmask & SDHCI_INT_DATA_MASK,
1064 host->ioaddr + SDHCI_INT_STATUS);
1065 sdhci_data_irq(host, intmask & SDHCI_INT_DATA_MASK);
1066 }
1067
1068 intmask &= ~(SDHCI_INT_CMD_MASK | SDHCI_INT_DATA_MASK);
1069
1070 intmask &= ~SDHCI_INT_ERROR;
1071
1072 if (intmask & SDHCI_INT_BUS_POWER) {
1073 printk(KERN_ERR "%s: Card is consuming too much power!\n",
1074 mmc_hostname(host->mmc));
1075 writel(SDHCI_INT_BUS_POWER, host->ioaddr + SDHCI_INT_STATUS);
1076 }
1077
1078 intmask &= ~SDHCI_INT_BUS_POWER;
1079
1080 if (intmask & SDHCI_INT_CARD_INT)
1081 cardint = 1;
1082
1083 intmask &= ~SDHCI_INT_CARD_INT;
1084
1085 if (intmask) {
1086 printk(KERN_ERR "%s: Unexpected interrupt 0x%08x.\n",
1087 mmc_hostname(host->mmc), intmask);
1088 sdhci_dumpregs(host);
1089
1090 writel(intmask, host->ioaddr + SDHCI_INT_STATUS);
1091 }
1092
1093 result = IRQ_HANDLED;
1094
1095 mmiowb();
1096 out:
1097 spin_unlock(&host->lock);
1098
1099 /*
1100 * We have to delay this as it calls back into the driver.
1101 */
1102 if (cardint)
1103 mmc_signal_sdio_irq(host->mmc);
1104
1105 return result;
1106 }
1107
1108 /*****************************************************************************\
1109 * *
1110 * Suspend/resume *
1111 * *
1112 \*****************************************************************************/
1113
1114 #ifdef CONFIG_PM
1115
1116 int sdhci_suspend_host(struct sdhci_host *host, pm_message_t state)
1117 {
1118 int ret;
1119
1120 ret = mmc_suspend_host(host->mmc, state);
1121 if (ret)
1122 return ret;
1123
1124 free_irq(host->irq, host);
1125
1126 return 0;
1127 }
1128
1129 EXPORT_SYMBOL_GPL(sdhci_suspend_host);
1130
1131 int sdhci_resume_host(struct sdhci_host *host)
1132 {
1133 int ret;
1134
1135 if (host->flags & SDHCI_USE_DMA) {
1136 if (host->ops->enable_dma)
1137 host->ops->enable_dma(host);
1138 }
1139
1140 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1141 mmc_hostname(host->mmc), host);
1142 if (ret)
1143 return ret;
1144
1145 sdhci_init(host);
1146 mmiowb();
1147
1148 ret = mmc_resume_host(host->mmc);
1149 if (ret)
1150 return ret;
1151
1152 return 0;
1153 }
1154
1155 EXPORT_SYMBOL_GPL(sdhci_resume_host);
1156
1157 #endif /* CONFIG_PM */
1158
1159 /*****************************************************************************\
1160 * *
1161 * Device allocation/registration *
1162 * *
1163 \*****************************************************************************/
1164
1165 struct sdhci_host *sdhci_alloc_host(struct device *dev,
1166 size_t priv_size)
1167 {
1168 struct mmc_host *mmc;
1169 struct sdhci_host *host;
1170
1171 WARN_ON(dev == NULL);
1172
1173 mmc = mmc_alloc_host(sizeof(struct sdhci_host) + priv_size, dev);
1174 if (!mmc)
1175 return ERR_PTR(-ENOMEM);
1176
1177 host = mmc_priv(mmc);
1178 host->mmc = mmc;
1179
1180 return host;
1181 }
1182
1183 EXPORT_SYMBOL_GPL(sdhci_alloc_host);
1184
1185 int sdhci_add_host(struct sdhci_host *host)
1186 {
1187 struct mmc_host *mmc;
1188 unsigned int caps;
1189 unsigned int version;
1190 int ret;
1191
1192 WARN_ON(host == NULL);
1193 if (host == NULL)
1194 return -EINVAL;
1195
1196 mmc = host->mmc;
1197
1198 if (debug_quirks)
1199 host->quirks = debug_quirks;
1200
1201 sdhci_reset(host, SDHCI_RESET_ALL);
1202
1203 version = readw(host->ioaddr + SDHCI_HOST_VERSION);
1204 version = (version & SDHCI_SPEC_VER_MASK) >> SDHCI_SPEC_VER_SHIFT;
1205 if (version > 1) {
1206 printk(KERN_ERR "%s: Unknown controller version (%d). "
1207 "You may experience problems.\n", mmc_hostname(mmc),
1208 version);
1209 }
1210
1211 caps = readl(host->ioaddr + SDHCI_CAPABILITIES);
1212
1213 if (host->quirks & SDHCI_QUIRK_FORCE_DMA)
1214 host->flags |= SDHCI_USE_DMA;
1215 else if (!(caps & SDHCI_CAN_DO_DMA))
1216 DBG("Controller doesn't have DMA capability\n");
1217 else
1218 host->flags |= SDHCI_USE_DMA;
1219
1220 if ((host->quirks & SDHCI_QUIRK_BROKEN_DMA) &&
1221 (host->flags & SDHCI_USE_DMA)) {
1222 DBG("Disabling DMA as it is marked broken\n");
1223 host->flags &= ~SDHCI_USE_DMA;
1224 }
1225
1226 if (host->flags & SDHCI_USE_DMA) {
1227 if (host->ops->enable_dma) {
1228 if (host->ops->enable_dma(host)) {
1229 printk(KERN_WARNING "%s: No suitable DMA "
1230 "available. Falling back to PIO.\n",
1231 mmc_hostname(mmc));
1232 host->flags &= ~SDHCI_USE_DMA;
1233 }
1234 }
1235 }
1236
1237 /* XXX: Hack to get MMC layer to avoid highmem */
1238 if (!(host->flags & SDHCI_USE_DMA))
1239 mmc_dev(host->mmc)->dma_mask = 0;
1240
1241 host->max_clk =
1242 (caps & SDHCI_CLOCK_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
1243 if (host->max_clk == 0) {
1244 printk(KERN_ERR "%s: Hardware doesn't specify base clock "
1245 "frequency.\n", mmc_hostname(mmc));
1246 return -ENODEV;
1247 }
1248 host->max_clk *= 1000000;
1249
1250 host->timeout_clk =
1251 (caps & SDHCI_TIMEOUT_CLK_MASK) >> SDHCI_TIMEOUT_CLK_SHIFT;
1252 if (host->timeout_clk == 0) {
1253 printk(KERN_ERR "%s: Hardware doesn't specify timeout clock "
1254 "frequency.\n", mmc_hostname(mmc));
1255 return -ENODEV;
1256 }
1257 if (caps & SDHCI_TIMEOUT_CLK_UNIT)
1258 host->timeout_clk *= 1000;
1259
1260 /*
1261 * Set host parameters.
1262 */
1263 mmc->ops = &sdhci_ops;
1264 mmc->f_min = host->max_clk / 256;
1265 mmc->f_max = host->max_clk;
1266 mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
1267
1268 if (caps & SDHCI_CAN_DO_HISPD)
1269 mmc->caps |= MMC_CAP_SD_HIGHSPEED;
1270
1271 mmc->ocr_avail = 0;
1272 if (caps & SDHCI_CAN_VDD_330)
1273 mmc->ocr_avail |= MMC_VDD_32_33|MMC_VDD_33_34;
1274 if (caps & SDHCI_CAN_VDD_300)
1275 mmc->ocr_avail |= MMC_VDD_29_30|MMC_VDD_30_31;
1276 if (caps & SDHCI_CAN_VDD_180)
1277 mmc->ocr_avail |= MMC_VDD_165_195;
1278
1279 if (mmc->ocr_avail == 0) {
1280 printk(KERN_ERR "%s: Hardware doesn't report any "
1281 "support voltages.\n", mmc_hostname(mmc));
1282 return -ENODEV;
1283 }
1284
1285 spin_lock_init(&host->lock);
1286
1287 /*
1288 * Maximum number of segments. Hardware cannot do scatter lists.
1289 */
1290 if (host->flags & SDHCI_USE_DMA)
1291 mmc->max_hw_segs = 1;
1292 else
1293 mmc->max_hw_segs = 16;
1294 mmc->max_phys_segs = 16;
1295
1296 /*
1297 * Maximum number of sectors in one transfer. Limited by DMA boundary
1298 * size (512KiB).
1299 */
1300 mmc->max_req_size = 524288;
1301
1302 /*
1303 * Maximum segment size. Could be one segment with the maximum number
1304 * of bytes.
1305 */
1306 mmc->max_seg_size = mmc->max_req_size;
1307
1308 /*
1309 * Maximum block size. This varies from controller to controller and
1310 * is specified in the capabilities register.
1311 */
1312 mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >> SDHCI_MAX_BLOCK_SHIFT;
1313 if (mmc->max_blk_size >= 3) {
1314 printk(KERN_WARNING "%s: Invalid maximum block size, "
1315 "assuming 512 bytes\n", mmc_hostname(mmc));
1316 mmc->max_blk_size = 512;
1317 } else
1318 mmc->max_blk_size = 512 << mmc->max_blk_size;
1319
1320 /*
1321 * Maximum block count.
1322 */
1323 mmc->max_blk_count = 65535;
1324
1325 /*
1326 * Init tasklets.
1327 */
1328 tasklet_init(&host->card_tasklet,
1329 sdhci_tasklet_card, (unsigned long)host);
1330 tasklet_init(&host->finish_tasklet,
1331 sdhci_tasklet_finish, (unsigned long)host);
1332
1333 setup_timer(&host->timer, sdhci_timeout_timer, (unsigned long)host);
1334
1335 ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
1336 mmc_hostname(mmc), host);
1337 if (ret)
1338 goto untasklet;
1339
1340 sdhci_init(host);
1341
1342 #ifdef CONFIG_MMC_DEBUG
1343 sdhci_dumpregs(host);
1344 #endif
1345
1346 #ifdef CONFIG_LEDS_CLASS
1347 host->led.name = mmc_hostname(mmc);
1348 host->led.brightness = LED_OFF;
1349 host->led.default_trigger = mmc_hostname(mmc);
1350 host->led.brightness_set = sdhci_led_control;
1351
1352 ret = led_classdev_register(mmc_dev(mmc), &host->led);
1353 if (ret)
1354 goto reset;
1355 #endif
1356
1357 mmiowb();
1358
1359 mmc_add_host(mmc);
1360
1361 printk(KERN_INFO "%s: SDHCI controller on %s [%s] using %s\n",
1362 mmc_hostname(mmc), host->hw_name, mmc_dev(mmc)->bus_id,
1363 (host->flags & SDHCI_USE_DMA)?"DMA":"PIO");
1364
1365 return 0;
1366
1367 #ifdef CONFIG_LEDS_CLASS
1368 reset:
1369 sdhci_reset(host, SDHCI_RESET_ALL);
1370 free_irq(host->irq, host);
1371 #endif
1372 untasklet:
1373 tasklet_kill(&host->card_tasklet);
1374 tasklet_kill(&host->finish_tasklet);
1375
1376 return ret;
1377 }
1378
1379 EXPORT_SYMBOL_GPL(sdhci_add_host);
1380
1381 void sdhci_remove_host(struct sdhci_host *host)
1382 {
1383 mmc_remove_host(host->mmc);
1384
1385 #ifdef CONFIG_LEDS_CLASS
1386 led_classdev_unregister(&host->led);
1387 #endif
1388
1389 sdhci_reset(host, SDHCI_RESET_ALL);
1390
1391 free_irq(host->irq, host);
1392
1393 del_timer_sync(&host->timer);
1394
1395 tasklet_kill(&host->card_tasklet);
1396 tasklet_kill(&host->finish_tasklet);
1397 }
1398
1399 EXPORT_SYMBOL_GPL(sdhci_remove_host);
1400
1401 void sdhci_free_host(struct sdhci_host *host)
1402 {
1403 mmc_free_host(host->mmc);
1404 }
1405
1406 EXPORT_SYMBOL_GPL(sdhci_free_host);
1407
1408 /*****************************************************************************\
1409 * *
1410 * Driver init/exit *
1411 * *
1412 \*****************************************************************************/
1413
1414 static int __init sdhci_drv_init(void)
1415 {
1416 printk(KERN_INFO DRIVER_NAME
1417 ": Secure Digital Host Controller Interface driver\n");
1418 printk(KERN_INFO DRIVER_NAME ": Copyright(c) Pierre Ossman\n");
1419
1420 return 0;
1421 }
1422
1423 static void __exit sdhci_drv_exit(void)
1424 {
1425 }
1426
1427 module_init(sdhci_drv_init);
1428 module_exit(sdhci_drv_exit);
1429
1430 module_param(debug_quirks, uint, 0444);
1431
1432 MODULE_AUTHOR("Pierre Ossman <drzeus@drzeus.cx>");
1433 MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
1434 MODULE_LICENSE("GPL");
1435
1436 MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
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