mmc: msm_sdcc: Add gpio handling function to driver

Configure SDCC GPIOs when the host is powered up or powered off.

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>

3 files changed, 51 insertions, 1 deletions

diff --git a/arch/arm/mach-msm/include/mach/mmc.h b/arch/arm/mach-msm/include/mach/mmc.h
index d54b6b086cff..5631b51cec46 100644
--- a/arch/arm/mach-msm/include/mach/mmc.h
+++ b/arch/arm/mach-msm/include/mach/mmc.h
@@ -15,12 +15,23 @@ struct embedded_sdio_data {
         int num_funcs;
 };
 
+struct msm_mmc_gpio {
+        unsigned no;
+        const char *name;
+};
+
+struct msm_mmc_gpio_data {
+        struct msm_mmc_gpio *gpio;
+        u8 size;
+};
+
 struct msm_mmc_platform_data {
         unsigned int ocr_mask;                  /* available voltages */
         u32 (*translate_vdd)(struct device *, unsigned int);
         unsigned int (*status)(struct device *);
         struct embedded_sdio_data *embedded_sdio;
         int (*register_status_notify)(void (*callback)(int card_present, void *dev_id), void *dev_id);
+        struct msm_mmc_gpio_data *gpio_data;
 };
 
 #endif
diff --git a/drivers/mmc/host/msm_sdcc.c b/drivers/mmc/host/msm_sdcc.c
index 153ab977a013..97c9b3638d57 100644
--- a/drivers/mmc/host/msm_sdcc.c
+++ b/drivers/mmc/host/msm_sdcc.c
@@ -36,6 +36,7 @@
 #include <linux/io.h>
 #include <linux/memory.h>
 #include <linux/gfp.h>
+#include <linux/gpio.h>
 
 #include <asm/cacheflush.h>
 #include <asm/div64.h>
@@ -941,6 +942,38 @@ msmsdcc_request(struct mmc_host *mmc, struct mmc_request *mrq)
         spin_unlock_irqrestore(&host->lock, flags);
 }
 
+static void msmsdcc_setup_gpio(struct msmsdcc_host *host, bool enable)
+{
+        struct msm_mmc_gpio_data *curr;
+        int i, rc = 0;
+
+        if (!host->plat->gpio_data && host->gpio_config_status == enable)
+                return;
+
+        curr = host->plat->gpio_data;
+        for (i = 0; i < curr->size; i++) {
+                if (enable) {
+                        rc = gpio_request(curr->gpio[i].no,
+                                                curr->gpio[i].name);
+                        if (rc) {
+                                pr_err("%s: gpio_request(%d, %s) failed %d\n",
+                                        mmc_hostname(host->mmc),
+                                        curr->gpio[i].no,
+                                        curr->gpio[i].name, rc);
+                                goto free_gpios;
+                        }
+                } else {
+                        gpio_free(curr->gpio[i].no);
+                }
+        }
+        host->gpio_config_status = enable;
+        return;
+
+free_gpios:
+        for (; i >= 0; i--)
+                gpio_free(curr->gpio[i].no);
+}
+
 static void
 msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 {
@@ -953,6 +986,8 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 
         msmsdcc_enable_clocks(host);
 
+        spin_unlock_irqrestore(&host->lock, flags);
+
         if (ios->clock) {
                 if (ios->clock != host->clk_rate) {
                         rc = clk_set_rate(host->clk, ios->clock);
@@ -979,9 +1014,11 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 
         switch (ios->power_mode) {
         case MMC_POWER_OFF:
+                msmsdcc_setup_gpio(host, false);
                 break;
         case MMC_POWER_UP:
                 pwr |= MCI_PWR_UP;
+                msmsdcc_setup_gpio(host, true);
                 break;
         case MMC_POWER_ON:
                 pwr |= MCI_PWR_ON;
@@ -998,9 +1035,10 @@ msmsdcc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                 msmsdcc_writel(host, pwr, MMCIPOWER);
         }
 #if BUSCLK_PWRSAVE
+        spin_lock_irqsave(&host->lock, flags);
         msmsdcc_disable_clocks(host, 1);
-#endif
         spin_unlock_irqrestore(&host->lock, flags);
+#endif
 }
 
 static void msmsdcc_enable_sdio_irq(struct mmc_host *mmc, int enable)
diff --git a/drivers/mmc/host/msm_sdcc.h b/drivers/mmc/host/msm_sdcc.h
index 939557af266d..42d7bbc977c5 100644
--- a/drivers/mmc/host/msm_sdcc.h
+++ b/drivers/mmc/host/msm_sdcc.h
@@ -243,6 +243,7 @@ struct msmsdcc_host {
         unsigned int            cmd_datactrl;
         struct mmc_command      *cmd_cmd;
         u32                     cmd_c;
+        bool                    gpio_config_status;
 
         bool prog_scan;
         bool prog_enable;