2 * linux/drivers/mmc/core/core.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2007 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
21 #include <asm/scatterlist.h>
22 #include <linux/scatterlist.h>
24 #include <linux/mmc/card.h>
25 #include <linux/mmc/host.h>
26 #include <linux/mmc/mmc.h>
27 #include <linux/mmc/sd.h>
35 extern int mmc_attach_mmc(struct mmc_host
*host
, u32 ocr
);
36 extern int mmc_attach_sd(struct mmc_host
*host
, u32 ocr
);
39 * mmc_request_done - finish processing an MMC request
40 * @host: MMC host which completed request
41 * @mrq: MMC request which request
43 * MMC drivers should call this function when they have completed
44 * their processing of a request.
46 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
48 struct mmc_command
*cmd
= mrq
->cmd
;
51 pr_debug("%s: req done (CMD%u): %d/%d/%d: %08x %08x %08x %08x\n",
52 mmc_hostname(host
), cmd
->opcode
, err
,
53 mrq
->data
? mrq
->data
->error
: 0,
54 mrq
->stop
? mrq
->stop
->error
: 0,
55 cmd
->resp
[0], cmd
->resp
[1], cmd
->resp
[2], cmd
->resp
[3]);
57 if (err
&& cmd
->retries
) {
60 host
->ops
->request(host
, mrq
);
61 } else if (mrq
->done
) {
66 EXPORT_SYMBOL(mmc_request_done
);
69 * mmc_start_request - start a command on a host
70 * @host: MMC host to start command on
71 * @mrq: MMC request to start
73 * Queue a command on the specified host. We expect the
74 * caller to be holding the host lock with interrupts disabled.
77 mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
79 #ifdef CONFIG_MMC_DEBUG
83 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
84 mmc_hostname(host
), mrq
->cmd
->opcode
,
85 mrq
->cmd
->arg
, mrq
->cmd
->flags
);
87 WARN_ON(!host
->claimed
);
92 BUG_ON(mrq
->data
->blksz
> host
->max_blk_size
);
93 BUG_ON(mrq
->data
->blocks
> host
->max_blk_count
);
94 BUG_ON(mrq
->data
->blocks
* mrq
->data
->blksz
>
97 #ifdef CONFIG_MMC_DEBUG
99 for (i
= 0;i
< mrq
->data
->sg_len
;i
++)
100 sz
+= mrq
->data
->sg
[i
].length
;
101 BUG_ON(sz
!= mrq
->data
->blocks
* mrq
->data
->blksz
);
104 mrq
->cmd
->data
= mrq
->data
;
105 mrq
->data
->error
= 0;
106 mrq
->data
->mrq
= mrq
;
108 mrq
->data
->stop
= mrq
->stop
;
109 mrq
->stop
->error
= 0;
110 mrq
->stop
->mrq
= mrq
;
113 host
->ops
->request(host
, mrq
);
116 EXPORT_SYMBOL(mmc_start_request
);
118 static void mmc_wait_done(struct mmc_request
*mrq
)
120 complete(mrq
->done_data
);
123 int mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
125 DECLARE_COMPLETION_ONSTACK(complete
);
127 mrq
->done_data
= &complete
;
128 mrq
->done
= mmc_wait_done
;
130 mmc_start_request(host
, mrq
);
132 wait_for_completion(&complete
);
137 EXPORT_SYMBOL(mmc_wait_for_req
);
140 * mmc_wait_for_cmd - start a command and wait for completion
141 * @host: MMC host to start command
142 * @cmd: MMC command to start
143 * @retries: maximum number of retries
145 * Start a new MMC command for a host, and wait for the command
146 * to complete. Return any error that occurred while the command
147 * was executing. Do not attempt to parse the response.
149 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
151 struct mmc_request mrq
;
153 BUG_ON(!host
->claimed
);
155 memset(&mrq
, 0, sizeof(struct mmc_request
));
157 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
158 cmd
->retries
= retries
;
163 mmc_wait_for_req(host
, &mrq
);
168 EXPORT_SYMBOL(mmc_wait_for_cmd
);
171 * mmc_set_data_timeout - set the timeout for a data command
172 * @data: data phase for command
173 * @card: the MMC card associated with the data transfer
174 * @write: flag to differentiate reads from writes
176 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
,
182 * SD cards use a 100 multiplier rather than 10
184 mult
= mmc_card_sd(card
) ? 100 : 10;
187 * Scale up the multiplier (and therefore the timeout) by
188 * the r2w factor for writes.
191 mult
<<= card
->csd
.r2w_factor
;
193 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
194 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
197 * SD cards also have an upper limit on the timeout.
199 if (mmc_card_sd(card
)) {
200 unsigned int timeout_us
, limit_us
;
202 timeout_us
= data
->timeout_ns
/ 1000;
203 timeout_us
+= data
->timeout_clks
* 1000 /
204 (card
->host
->ios
.clock
/ 1000);
212 * SDHC cards always use these fixed values.
214 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
215 data
->timeout_ns
= limit_us
* 1000;
216 data
->timeout_clks
= 0;
220 EXPORT_SYMBOL(mmc_set_data_timeout
);
223 * __mmc_claim_host - exclusively claim a host
224 * @host: mmc host to claim
225 * @card: mmc card to claim host for
227 * Claim a host for a set of operations. If a valid card
228 * is passed and this wasn't the last card selected, select
229 * the card before returning.
231 * Note: you should use mmc_card_claim_host or mmc_claim_host.
233 void mmc_claim_host(struct mmc_host
*host
)
235 DECLARE_WAITQUEUE(wait
, current
);
238 add_wait_queue(&host
->wq
, &wait
);
239 spin_lock_irqsave(&host
->lock
, flags
);
241 set_current_state(TASK_UNINTERRUPTIBLE
);
244 spin_unlock_irqrestore(&host
->lock
, flags
);
246 spin_lock_irqsave(&host
->lock
, flags
);
248 set_current_state(TASK_RUNNING
);
250 spin_unlock_irqrestore(&host
->lock
, flags
);
251 remove_wait_queue(&host
->wq
, &wait
);
254 EXPORT_SYMBOL(mmc_claim_host
);
257 * mmc_release_host - release a host
258 * @host: mmc host to release
260 * Release a MMC host, allowing others to claim the host
261 * for their operations.
263 void mmc_release_host(struct mmc_host
*host
)
267 BUG_ON(!host
->claimed
);
269 spin_lock_irqsave(&host
->lock
, flags
);
271 spin_unlock_irqrestore(&host
->lock
, flags
);
276 EXPORT_SYMBOL(mmc_release_host
);
279 * Internal function that does the actual ios call to the host driver,
280 * optionally printing some debug output.
282 static inline void mmc_set_ios(struct mmc_host
*host
)
284 struct mmc_ios
*ios
= &host
->ios
;
286 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
287 "width %u timing %u\n",
288 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
289 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
290 ios
->bus_width
, ios
->timing
);
292 host
->ops
->set_ios(host
, ios
);
296 * Control chip select pin on a host.
298 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
300 host
->ios
.chip_select
= mode
;
305 * Sets the host clock to the highest possible frequency that
308 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
310 WARN_ON(hz
< host
->f_min
);
312 if (hz
> host
->f_max
)
315 host
->ios
.clock
= hz
;
320 * Change the bus mode (open drain/push-pull) of a host.
322 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
324 host
->ios
.bus_mode
= mode
;
329 * Change data bus width of a host.
331 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
333 host
->ios
.bus_width
= width
;
338 * Mask off any voltages we don't support and select
341 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
345 ocr
&= host
->ocr_avail
;
363 * Select timing parameters for host.
365 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
367 host
->ios
.timing
= timing
;
372 * Allocate a new MMC card
374 struct mmc_card
*mmc_alloc_card(struct mmc_host
*host
)
376 struct mmc_card
*card
;
378 card
= kmalloc(sizeof(struct mmc_card
), GFP_KERNEL
);
380 return ERR_PTR(-ENOMEM
);
382 mmc_init_card(card
, host
);
388 * Apply power to the MMC stack. This is a two-stage process.
389 * First, we enable power to the card without the clock running.
390 * We then wait a bit for the power to stabilise. Finally,
391 * enable the bus drivers and clock to the card.
393 * We must _NOT_ enable the clock prior to power stablising.
395 * If a host does all the power sequencing itself, ignore the
396 * initial MMC_POWER_UP stage.
398 static void mmc_power_up(struct mmc_host
*host
)
400 int bit
= fls(host
->ocr_avail
) - 1;
403 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
404 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
405 host
->ios
.power_mode
= MMC_POWER_UP
;
406 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
407 host
->ios
.timing
= MMC_TIMING_LEGACY
;
412 host
->ios
.clock
= host
->f_min
;
413 host
->ios
.power_mode
= MMC_POWER_ON
;
419 static void mmc_power_off(struct mmc_host
*host
)
423 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
424 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
425 host
->ios
.power_mode
= MMC_POWER_OFF
;
426 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
427 host
->ios
.timing
= MMC_TIMING_LEGACY
;
432 * Assign a mmc bus handler to a host. Only one bus handler may control a
433 * host at any given time.
435 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
442 BUG_ON(!host
->claimed
);
444 spin_lock_irqsave(&host
->lock
, flags
);
446 BUG_ON(host
->bus_ops
);
447 BUG_ON(host
->bus_refs
);
453 spin_unlock_irqrestore(&host
->lock
, flags
);
457 * Remove the current bus handler from a host. Assumes that there are
458 * no interesting cards left, so the bus is powered down.
460 void mmc_detach_bus(struct mmc_host
*host
)
466 BUG_ON(!host
->claimed
);
467 BUG_ON(!host
->bus_ops
);
469 spin_lock_irqsave(&host
->lock
, flags
);
473 spin_unlock_irqrestore(&host
->lock
, flags
);
481 * Cleanup when the last reference to the bus operator is dropped.
483 void __mmc_release_bus(struct mmc_host
*host
)
486 BUG_ON(host
->bus_refs
);
487 BUG_ON(!host
->bus_dead
);
489 host
->bus_ops
= NULL
;
493 * mmc_detect_change - process change of state on a MMC socket
494 * @host: host which changed state.
495 * @delay: optional delay to wait before detection (jiffies)
497 * All we know is that card(s) have been inserted or removed
498 * from the socket(s). We don't know which socket or cards.
500 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
502 #ifdef CONFIG_MMC_DEBUG
503 mmc_claim_host(host
);
504 BUG_ON(host
->removed
);
505 mmc_release_host(host
);
508 mmc_schedule_delayed_work(&host
->detect
, delay
);
511 EXPORT_SYMBOL(mmc_detect_change
);
514 static void mmc_rescan(struct work_struct
*work
)
516 struct mmc_host
*host
=
517 container_of(work
, struct mmc_host
, detect
.work
);
523 if (host
->bus_ops
== NULL
) {
525 * Only we can add a new handler, so it's safe to
526 * release the lock here.
530 mmc_claim_host(host
);
535 mmc_send_if_cond(host
, host
->ocr_avail
);
537 err
= mmc_send_app_op_cond(host
, 0, &ocr
);
538 if (err
== MMC_ERR_NONE
) {
539 if (mmc_attach_sd(host
, ocr
))
543 * If we fail to detect any SD cards then try
544 * searching for MMC cards.
546 err
= mmc_send_op_cond(host
, 0, &ocr
);
547 if (err
== MMC_ERR_NONE
) {
548 if (mmc_attach_mmc(host
, ocr
))
552 mmc_release_host(host
);
556 if (host
->bus_ops
->detect
&& !host
->bus_dead
)
557 host
->bus_ops
->detect(host
);
565 * mmc_alloc_host - initialise the per-host structure.
566 * @extra: sizeof private data structure
567 * @dev: pointer to host device model structure
569 * Initialise the per-host structure.
571 struct mmc_host
*mmc_alloc_host(int extra
, struct device
*dev
)
573 struct mmc_host
*host
;
575 host
= mmc_alloc_host_sysfs(extra
, dev
);
577 spin_lock_init(&host
->lock
);
578 init_waitqueue_head(&host
->wq
);
579 INIT_DELAYED_WORK(&host
->detect
, mmc_rescan
);
582 * By default, hosts do not support SGIO or large requests.
583 * They have to set these according to their abilities.
585 host
->max_hw_segs
= 1;
586 host
->max_phys_segs
= 1;
587 host
->max_seg_size
= PAGE_CACHE_SIZE
;
589 host
->max_req_size
= PAGE_CACHE_SIZE
;
590 host
->max_blk_size
= 512;
591 host
->max_blk_count
= PAGE_CACHE_SIZE
/ 512;
597 EXPORT_SYMBOL(mmc_alloc_host
);
600 * mmc_add_host - initialise host hardware
603 int mmc_add_host(struct mmc_host
*host
)
607 ret
= mmc_add_host_sysfs(host
);
610 mmc_detect_change(host
, 0);
616 EXPORT_SYMBOL(mmc_add_host
);
619 * mmc_remove_host - remove host hardware
622 * Unregister and remove all cards associated with this host,
623 * and power down the MMC bus.
625 void mmc_remove_host(struct mmc_host
*host
)
627 #ifdef CONFIG_MMC_DEBUG
628 mmc_claim_host(host
);
630 mmc_release_host(host
);
633 mmc_flush_scheduled_work();
636 if (host
->bus_ops
&& !host
->bus_dead
) {
637 if (host
->bus_ops
->remove
)
638 host
->bus_ops
->remove(host
);
640 mmc_claim_host(host
);
641 mmc_detach_bus(host
);
642 mmc_release_host(host
);
649 mmc_remove_host_sysfs(host
);
652 EXPORT_SYMBOL(mmc_remove_host
);
655 * mmc_free_host - free the host structure
658 * Free the host once all references to it have been dropped.
660 void mmc_free_host(struct mmc_host
*host
)
662 mmc_free_host_sysfs(host
);
665 EXPORT_SYMBOL(mmc_free_host
);
670 * mmc_suspend_host - suspend a host
672 * @state: suspend mode (PM_SUSPEND_xxx)
674 int mmc_suspend_host(struct mmc_host
*host
, pm_message_t state
)
676 mmc_flush_scheduled_work();
679 if (host
->bus_ops
&& !host
->bus_dead
) {
680 if (host
->bus_ops
->suspend
)
681 host
->bus_ops
->suspend(host
);
682 if (!host
->bus_ops
->resume
) {
683 if (host
->bus_ops
->remove
)
684 host
->bus_ops
->remove(host
);
686 mmc_claim_host(host
);
687 mmc_detach_bus(host
);
688 mmc_release_host(host
);
698 EXPORT_SYMBOL(mmc_suspend_host
);
701 * mmc_resume_host - resume a previously suspended host
704 int mmc_resume_host(struct mmc_host
*host
)
707 if (host
->bus_ops
&& !host
->bus_dead
) {
709 BUG_ON(!host
->bus_ops
->resume
);
710 host
->bus_ops
->resume(host
);
715 * We add a slight delay here so that resume can progress
718 mmc_detect_change(host
, 1);
723 EXPORT_SYMBOL(mmc_resume_host
);
727 MODULE_LICENSE("GPL");
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