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mmc: add MMC_CAP_NONREMOVABLE host capability 

eMMC's are not removable, so unsafe resume is OK always.

To permit this a new host capability MMC_CAP_NONREMOVABLE has been added
and suspend / resume updated accordingly.

Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Acked-by: Matt Fleming <matt@console-pimps.org>
Cc: Ian Molton <ian@mnementh.co.uk>
Cc: "Roberto A. Foglietta" <roberto.foglietta@gmail.com>
Cc: Jarkko Lavinen <jarkko.lavinen@nokia.com>
Cc: Denis Karpov <ext-denis.2.karpov@nokia.com>
Cc: Pierre Ossman <pierre@ossman.eu>
Cc: Philip Langdale <philipl@overt.org>
Cc: "Madhusudhan" <madhu.cr@ti.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Adrian Hunter 2009-09-22 16:44:32 -07:00 committed by Linus Torvalds
parent 319a3f1429
commit 9feae24696
3 changed files with 73 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
drivers/mmc/core/mmc.c
View File

@ -507,8 +507,6 @@ static void mmc_detect(struct mmc_host *host)
}
}
#ifdef CONFIG_MMC_UNSAFE_RESUME
/*
* Suspend callback from host.
*/
@ -551,12 +549,7 @@ static void mmc_resume(struct mmc_host *host)
}
#else
#define mmc_suspend NULL
#define mmc_resume NULL
#endif
#ifdef CONFIG_MMC_UNSAFE_RESUME
static const struct mmc_bus_ops mmc_ops = {
.remove = mmc_remove,
@ -565,6 +558,40 @@ static const struct mmc_bus_ops mmc_ops = {
.resume = mmc_resume,
};
static void mmc_attach_bus_ops(struct mmc_host *host)
{
mmc_attach_bus(host, &mmc_ops);
}
#else
static const struct mmc_bus_ops mmc_ops = {
.remove = mmc_remove,
.detect = mmc_detect,
.suspend = NULL,
.resume = NULL,
};
static const struct mmc_bus_ops mmc_ops_unsafe = {
.remove = mmc_remove,
.detect = mmc_detect,
.suspend = mmc_suspend,
.resume = mmc_resume,
};
static void mmc_attach_bus_ops(struct mmc_host *host)
{
const struct mmc_bus_ops *bus_ops;
if (host->caps & MMC_CAP_NONREMOVABLE)
bus_ops = &mmc_ops_unsafe;
else
bus_ops = &mmc_ops;
mmc_attach_bus(host, bus_ops);
}
#endif
/*
* Starting point for MMC card init.
*/
@ -575,7 +602,7 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
BUG_ON(!host);
WARN_ON(!host->claimed);
mmc_attach_bus(host, &mmc_ops);
mmc_attach_bus_ops(host);
/*
* We need to get OCR a different way for SPI.

45
drivers/mmc/core/sd.c
View File

@ -561,8 +561,6 @@ static void mmc_sd_detect(struct mmc_host *host)
}
}
#ifdef CONFIG_MMC_UNSAFE_RESUME
/*
* Suspend callback from host.
*/
@ -605,12 +603,7 @@ static void mmc_sd_resume(struct mmc_host *host)
}
#else
#define mmc_sd_suspend NULL
#define mmc_sd_resume NULL
#endif
#ifdef CONFIG_MMC_UNSAFE_RESUME
static const struct mmc_bus_ops mmc_sd_ops = {
.remove = mmc_sd_remove,
@ -619,6 +612,40 @@ static const struct mmc_bus_ops mmc_sd_ops = {
.resume = mmc_sd_resume,
};
static void mmc_sd_attach_bus_ops(struct mmc_host *host)
{
mmc_attach_bus(host, &mmc_sd_ops);
}
#else
static const struct mmc_bus_ops mmc_sd_ops = {
.remove = mmc_sd_remove,
.detect = mmc_sd_detect,
.suspend = NULL,
.resume = NULL,
};
static const struct mmc_bus_ops mmc_sd_ops_unsafe = {
.remove = mmc_sd_remove,
.detect = mmc_sd_detect,
.suspend = mmc_sd_suspend,
.resume = mmc_sd_resume,
};
static void mmc_sd_attach_bus_ops(struct mmc_host *host)
{
const struct mmc_bus_ops *bus_ops;
if (host->caps & MMC_CAP_NONREMOVABLE)
bus_ops = &mmc_sd_ops_unsafe;
else
bus_ops = &mmc_sd_ops;
mmc_attach_bus(host, bus_ops);
}
#endif
/*
* Starting point for SD card init.
*/
@ -629,7 +656,7 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
BUG_ON(!host);
WARN_ON(!host->claimed);
mmc_attach_bus(host, &mmc_sd_ops);
mmc_sd_attach_bus_ops(host);
/*
* We need to get OCR a different way for SPI.

1
include/linux/mmc/host.h
View File

@ -148,6 +148,7 @@ struct mmc_host {
#define MMC_CAP_NEEDS_POLL (1 << 5) /* Needs polling for card-detection */
#define MMC_CAP_8_BIT_DATA (1 << 6) /* Can the host do 8 bit transfers */
#define MMC_CAP_DISABLE (1 << 7) /* Can the host be disabled */
#define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */
/* host specific block data */
unsigned int max_seg_size; /* see blk_queue_max_segment_size */