ARM: OMAP: mmc-twl4030: add regulator sleep / wake function

Add the ability for the driver to put the card power regulators to sleep
and wake them up again.

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 cb1cbd7..c9c59a2 100644 (file)
--- a/arch/arm/mach-omap2/mmc-twl4030.c
+++ b/arch/arm/mach-omap2/mmc-twl4030.c
@@ -340,6 +340,61 @@ static int twl_mmc23_set_power(struct device *dev, int slot, int power_on, int v
        return ret;
 }
 
+static int twl_mmc1_set_sleep(struct device *dev, int slot, int sleep, int vdd,
+                             int cardsleep)
+{
+       struct twl_mmc_controller *c = &hsmmc[0];
+       int mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
+
+       return regulator_set_mode(c->vcc, mode);
+}
+
+static int twl_mmc23_set_sleep(struct device *dev, int slot, int sleep, int vdd,
+                              int cardsleep)
+{
+       struct twl_mmc_controller *c = NULL;
+       struct omap_mmc_platform_data *mmc = dev->platform_data;
+       int i, err, mode;
+
+       for (i = 1; i < ARRAY_SIZE(hsmmc); i++) {
+               if (mmc == hsmmc[i].mmc) {
+                       c = &hsmmc[i];
+                       break;
+               }
+       }
+
+       if (c == NULL)
+               return -ENODEV;
+
+       /*
+        * If we don't see a Vcc regulator, assume it's a fixed
+        * voltage always-on regulator.
+        */
+       if (!c->vcc)
+               return 0;
+
+       mode = sleep ? REGULATOR_MODE_STANDBY : REGULATOR_MODE_NORMAL;
+
+       if (!c->vcc_aux)
+               return regulator_set_mode(c->vcc, mode);
+
+       if (cardsleep) {
+               /* VCC can be turned off if card is asleep */
+               struct regulator *vcc_aux = c->vcc_aux;
+
+               c->vcc_aux = NULL;
+               if (sleep)
+                       err = twl_mmc23_set_power(dev, slot, 0, 0);
+               else
+                       err = twl_mmc23_set_power(dev, slot, 1, vdd);
+               c->vcc_aux = vcc_aux;
+       } else
+               err = regulator_set_mode(c->vcc, mode);
+       if (err)
+               return err;
+       return regulator_set_mode(c->vcc_aux, mode);
+}
+
 static struct omap_mmc_platform_data *hsmmc_data[OMAP34XX_NR_MMC] __initdata;
 
 void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
@@ -433,6 +488,7 @@ void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
                case 1:
                        /* on-chip level shifting via PBIAS0/PBIAS1 */
                        mmc->slots[0].set_power = twl_mmc1_set_power;
+                       mmc->slots[0].set_sleep = twl_mmc1_set_sleep;
                        break;
                case 2:
                        if (c->ext_clock)
@@ -443,6 +499,7 @@ void __init twl4030_mmc_init(struct twl4030_hsmmc_info *controllers)
                case 3:
                        /* off-chip level shifting, or none */
                        mmc->slots[0].set_power = twl_mmc23_set_power;
+                       mmc->slots[0].set_sleep = twl_mmc23_set_sleep;
                        break;
                default:
                        pr_err("MMC%d configuration not supported!\n", c->mmc);

diff --git a/arch/arm/plat-omap/include/mach/mmc.h b/arch/arm/plat-omap/include/mach/mmc.h
index 82f1e29..9390297 100644 (file)
--- a/arch/arm/plat-omap/include/mach/mmc.h
+++ b/arch/arm/plat-omap/include/mach/mmc.h
@@ -95,6 +95,8 @@ struct omap_mmc_platform_data {
                int (* set_bus_mode)(struct device *dev, int slot, int bus_mode);
                int (* set_power)(struct device *dev, int slot, int power_on, int vdd);
                int (* get_ro)(struct device *dev, int slot);
+               int (*set_sleep)(struct device *dev, int slot, int sleep,
+                                int vdd, int cardsleep);
 
                /* return MMC cover switch state, can be NULL if not supported.
                 *