[ARM] pxamci: add simple gpio controls

The MMC block needs 3 external datas to work :
 - is the MMC card put in "read-only mode" ?
 - is a MMC card inserted or removed ?
 - enable power towards the MMC card

Several platforms provide these controls through
gpios. Expand the platform_data to request and use these
gpios is set up by board code.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Acked-by: Pierre.Ossman <pierre@ossman.eu>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

2 files changed, 85 insertions, 1 deletions

diff --git a/arch/arm/mach-pxa/include/mach/mmc.h b/arch/arm/mach-pxa/include/mach/mmc.h
index 6d1304c9270f..02a69dc2ee63 100644
--- a/arch/arm/mach-pxa/include/mach/mmc.h
+++ b/arch/arm/mach-pxa/include/mach/mmc.h
@@ -14,6 +14,11 @@ struct pxamci_platform_data {
         int (*get_ro)(struct device *);
         void (*setpower)(struct device *, unsigned int);
         void (*exit)(struct device *, void *);
+        int gpio_card_detect;                   /* gpio detecting card insertion */
+        int gpio_card_ro;                       /* gpio detecting read only toggle */
+        bool gpio_card_ro_invert;               /* gpio ro is inverted */
+        int gpio_power;                         /* gpio powering up MMC bus */
+        bool gpio_power_invert;                 /* gpio power is inverted */
 };
 
 extern void pxa_set_mci_info(struct pxamci_platform_data *info);
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index e55ac792d68c..972efa8d2c8e 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -28,6 +28,7 @@
 #include <linux/mmc/host.h>
 #include <linux/io.h>
 #include <linux/regulator/consumer.h>
+#include <linux/gpio.h>
 
 #include <asm/sizes.h>
 
@@ -96,10 +97,18 @@ static inline void pxamci_init_ocr(struct pxamci_host *host)
 
 static inline void pxamci_set_power(struct pxamci_host *host, unsigned int vdd)
 {
+        int on;
+
 #ifdef CONFIG_REGULATOR
         if (host->vcc)
                 mmc_regulator_set_ocr(host->vcc, vdd);
 #endif
+        if (!host->vcc && host->pdata &&
+            gpio_is_valid(host->pdata->gpio_power)) {
+                on = ((1 << vdd) & host->pdata->ocr_mask);
+                gpio_set_value(host->pdata->gpio_power,
+                               !!on ^ host->pdata->gpio_power_invert);
+        }
         if (!host->vcc && host->pdata && host->pdata->setpower)
                 host->pdata->setpower(mmc_dev(host->mmc), vdd);
 }
@@ -421,6 +430,12 @@ static int pxamci_get_ro(struct mmc_host *mmc)
 {
         struct pxamci_host *host = mmc_priv(mmc);
 
+        if (host->pdata && gpio_is_valid(host->pdata->gpio_card_ro)) {
+                if (host->pdata->gpio_card_ro_invert)
+                        return !gpio_get_value(host->pdata->gpio_card_ro);
+                else
+                        return gpio_get_value(host->pdata->gpio_card_ro);
+        }
         if (host->pdata && host->pdata->get_ro)
                 return !!host->pdata->get_ro(mmc_dev(mmc));
         /*
@@ -534,7 +549,7 @@ static int pxamci_probe(struct platform_device *pdev)
         struct mmc_host *mmc;
         struct pxamci_host *host = NULL;
         struct resource *r, *dmarx, *dmatx;
-        int ret, irq;
+        int ret, irq, gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
 
         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         irq = platform_get_irq(pdev, 0);
@@ -661,13 +676,63 @@ static int pxamci_probe(struct platform_device *pdev)
         }
         host->dma_drcmrtx = dmatx->start;
 
+        if (host->pdata) {
+                gpio_cd = host->pdata->gpio_card_detect;
+                gpio_ro = host->pdata->gpio_card_ro;
+                gpio_power = host->pdata->gpio_power;
+        }
+        if (gpio_is_valid(gpio_power)) {
+                ret = gpio_request(gpio_power, "mmc card power");
+                if (ret) {
+                        dev_err(&pdev->dev, "Failed requesting gpio_power %d\n", gpio_power);
+                        goto out;
+                }
+                gpio_direction_output(gpio_power,
+                                      host->pdata->gpio_power_invert);
+        }
+        if (gpio_is_valid(gpio_ro)) {
+                ret = gpio_request(gpio_ro, "mmc card read only");
+                if (ret) {
+                        dev_err(&pdev->dev, "Failed requesting gpio_ro %d\n", gpio_power);
+                        goto err_gpio_ro;
+                }
+                gpio_direction_input(gpio_ro);
+        }
+        if (gpio_is_valid(gpio_cd)) {
+                ret = gpio_request(gpio_cd, "mmc card detect");
+                if (ret) {
+                        dev_err(&pdev->dev, "Failed requesting gpio_cd %d\n", gpio_power);
+                        goto err_gpio_cd;
+                }
+                gpio_direction_input(gpio_cd);
+
+                ret = request_irq(gpio_to_irq(gpio_cd), pxamci_detect_irq,
+                                  IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+                                  "mmc card detect", mmc);
+                if (ret) {
+                        dev_err(&pdev->dev, "failed to request card detect IRQ\n");
+                        goto err_request_irq;
+                }
+        }
+
         if (host->pdata && host->pdata->init)
                 host->pdata->init(&pdev->dev, pxamci_detect_irq, mmc);
 
+        if (gpio_is_valid(gpio_power) && host->pdata->setpower)
+                dev_warn(&pdev->dev, "gpio_power and setpower() both defined\n");
+        if (gpio_is_valid(gpio_ro) && host->pdata->get_ro)
+                dev_warn(&pdev->dev, "gpio_ro and get_ro() both defined\n");
+
         mmc_add_host(mmc);
 
         return 0;
 
+err_request_irq:
+        gpio_free(gpio_cd);
+err_gpio_cd:
+        gpio_free(gpio_ro);
+err_gpio_ro:
+        gpio_free(gpio_power);
  out:
         if (host) {
                 if (host->dma >= 0)
@@ -688,12 +753,26 @@ static int pxamci_probe(struct platform_device *pdev)
 static int pxamci_remove(struct platform_device *pdev)
 {
         struct mmc_host *mmc = platform_get_drvdata(pdev);
+        int gpio_cd = -1, gpio_ro = -1, gpio_power = -1;
 
         platform_set_drvdata(pdev, NULL);
 
         if (mmc) {
                 struct pxamci_host *host = mmc_priv(mmc);
 
+                if (host->pdata) {
+                        gpio_cd = host->pdata->gpio_card_detect;
+                        gpio_ro = host->pdata->gpio_card_ro;
+                        gpio_power = host->pdata->gpio_power;
+                }
+                if (gpio_is_valid(gpio_cd)) {
+                        free_irq(gpio_to_irq(gpio_cd), mmc);
+                        gpio_free(gpio_cd);
+                }
+                if (gpio_is_valid(gpio_ro))
+                        gpio_free(gpio_ro);
+                if (gpio_is_valid(gpio_power))
+                        gpio_free(gpio_power);
                 if (host->vcc)
                         regulator_put(host->vcc);