[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>

diff --git a/arch/arm/mach-pxa/include/mach/mmc.h b/arch/arm/mach-pxa/include/mach/mmc.h
index 6d1304c..02a69dc 100644 (file)
--- 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 e55ac79..972efa8 100644 (file)
--- 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);