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authorRobert Jarzmik <robert.jarzmik@free.fr>2009-06-23 23:21:03 +0200
committerEric Miao <eric.y.miao@gmail.com>2009-09-10 18:49:29 +0800
commitb405db6c015fe8e4c9d8199a0355bb16d95d7049 (patch)
tree691c77f067e550deb36e973952144ed3378bc2b9 /drivers/mmc/host/pxamci.c
parent53eff4175f1eb25f97425b1526774fecb81444d4 (diff)
[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>
Diffstat (limited to 'drivers/mmc/host/pxamci.c')
-rw-r--r--drivers/mmc/host/pxamci.c81
1 files changed, 80 insertions, 1 deletions
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);