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

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>

diff --git a/arch/arm/mach-omap2/mmc-twl4030.c b/arch/arm/mach-omap2/mmc-twl4030.c
index 3c04c2f..30d0286 100644 (file)
--- a/arch/arm/mach-omap2/mmc-twl4030.c
+++ b/arch/arm/mach-omap2/mmc-twl4030.c
@@ -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");

diff --git a/arch/arm/plat-omap/include/mach/mmc.h b/arch/arm/plat-omap/include/mach/mmc.h
index 81d5b36..2f7cf31 100644 (file)
--- a/arch/arm/plat-omap/include/mach/mmc.h
+++ b/arch/arm/plat-omap/include/mach/mmc.h
@@ -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 {