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ARM: OMAP: mmc-twl4030: add context loss counter support

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PM dynamic OFF state results in context loss.  That is, the host
controller has been powered off at some point, which means the registers
have been reset.  The driver must detect when this happens, and restore
the context.  This patch adds the means to detect context loss.

Note, the PM side is not yet implemented.

Signed-off-by: Denis Karpov <ext-denis.2.karpov@nokia.com>
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:
Denis Karpov 2009-09-22 16:44:40 -07:00 committed by Linus Torvalds
parent 5e2ea6173d
commit 1887bde391
2 changed files with 18 additions and 0 deletions
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15
arch/arm/mach-omap2/mmc-twl4030.c
View File

@ -198,6 +198,18 @@ static int twl_mmc_resume(struct device *dev, int slot)
#define twl_mmc_resume NULL
#endif
#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_PM)
static int twl4030_mmc_get_context_loss(struct device *dev)
{
/* FIXME: PM DPS not implemented yet */
return 0;
}
#else
#define twl4030_mmc_get_context_loss NULL
#endif
static int twl_mmc1_set_power(struct device *dev, int slot, int power_on,
int vdd)
{
@ -390,6 +402,9 @@ void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
} else
mmc->slots[0].switch_pin = -EINVAL;
mmc->get_context_loss_count =
twl4030_mmc_get_context_loss;
/* write protect normally uses an OMAP gpio */
if (gpio_is_valid(c->gpio_wp)) {
gpio_request(c->gpio_wp, "mmc_wp");

3
arch/arm/plat-omap/include/mach/mmc.h
View File

@ -59,6 +59,9 @@ struct omap_mmc_platform_data {
int (*suspend)(struct device *dev, int slot);
int (*resume)(struct device *dev, int slot);
/* Return context loss count due to PM states changing */
int (*get_context_loss_count)(struct device *dev);
u64 dma_mask;
struct omap_mmc_slot_data {