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Commit f8ec589b authored by Russell King's avatar Russell King Committed by Chris Ball
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mmc: sdhci-dove: allow GPIOs to be used for card detection on Dove 



This commit taken from Rabeeh's Cubox kernel and re-worked for DT;
Sebastian Hasselbrath is believed to be the original author.

Some Cuboxes require a GPIO for card detection; this implements the
optional GPIO support for card detection.  This GPIO is logic 0 for
card inserted.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent c430689f

drivers/mmc/host/sdhci-dove.c

+67 −6
Original line number Diff line number Diff line
@@ -19,20 +19,30 @@ 
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */



#include <linux/err.h>

#include <linux/io.h>

#include <linux/clk.h>

#include <linux/err.h>

#include <linux/module.h>

#include <linux/gpio.h>

#include <linux/io.h>

#include <linux/mmc/host.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/of_gpio.h>



#include "sdhci-pltfm.h"



struct sdhci_dove_priv {

	struct clk *clk;

	int gpio_cd;

};



static irqreturn_t sdhci_dove_carddetect_irq(int irq, void *data)

{

	struct sdhci_host *host = data;



	tasklet_schedule(&host->card_tasklet);

	return IRQ_HANDLED;

}



static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)

{

	u16 ret;
@@ -50,16 +60,25 @@ static u16 sdhci_dove_readw(struct sdhci_host *host, int reg) 


static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)

{

	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);

	struct sdhci_dove_priv *priv = pltfm_host->priv;

	u32 ret;



	ret = readl(host->ioaddr + reg);



	switch (reg) {

	case SDHCI_CAPABILITIES:

		ret = readl(host->ioaddr + reg);

		/* Mask the support for 3.0V */

		ret &= ~SDHCI_CAN_VDD_300;

		break;

	default:

		ret = readl(host->ioaddr + reg);

	case SDHCI_PRESENT_STATE:

		if (gpio_is_valid(priv->gpio_cd)) {

			if (gpio_get_value(priv->gpio_cd) == 0)

				ret |= SDHCI_CARD_PRESENT;

			else

				ret &= ~SDHCI_CARD_PRESENT;

		}

		break;

	}

	return ret;

}
@@ -94,6 +113,23 @@ static int __devinit sdhci_dove_probe(struct platform_device *pdev) 


	priv->clk = devm_clk_get(&pdev->dev, NULL);



	if (pdev->dev.of_node) {

		priv->gpio_cd = of_get_named_gpio(pdev->dev.of_node,

						  "cd-gpios", 0);

	} else {

		priv->gpio_cd = -EINVAL;

	}



	if (gpio_is_valid(priv->gpio_cd)) {

		ret = gpio_request(priv->gpio_cd, "sdhci-cd");

		if (ret) {

			dev_err(&pdev->dev, "card detect gpio request failed: %d\n",

				ret);

			return ret;

		}

		gpio_direction_input(priv->gpio_cd);

	}



	host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata);

	if (IS_ERR(host)) {

		ret = PTR_ERR(host);
@@ -112,13 +148,33 @@ static int __devinit sdhci_dove_probe(struct platform_device *pdev) 
	if (ret)

		goto err_sdhci_add;



	/*

	 * We must request the IRQ after sdhci_add_host(), as the tasklet only

	 * gets setup in sdhci_add_host() and we oops.

	 */

	if (gpio_is_valid(priv->gpio_cd)) {

		ret = request_irq(gpio_to_irq(priv->gpio_cd),

				  sdhci_dove_carddetect_irq,

				  IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,

				  mmc_hostname(host->mmc), host);

		if (ret) {

			dev_err(&pdev->dev, "card detect irq request failed: %d\n",

				ret);

			goto err_request_irq;

		}

	}



	return 0;



err_request_irq:

	sdhci_remove_host(host, 0);

err_sdhci_add:

	if (!IS_ERR(priv->clk))

		clk_disable_unprepare(priv->clk);

	sdhci_pltfm_free(pdev);

err_sdhci_pltfm_init:

	if (gpio_is_valid(priv->gpio_cd))

		gpio_free(priv->gpio_cd);

	return ret;

}
@@ -130,6 +186,11 @@ static int __devexit sdhci_dove_remove(struct platform_device *pdev) 


	sdhci_pltfm_unregister(pdev);



	if (gpio_is_valid(priv->gpio_cd)) {

		free_irq(gpio_to_irq(priv->gpio_cd), host);

		gpio_free(priv->gpio_cd);

	}



	if (!IS_ERR(priv->clk))

		clk_disable_unprepare(priv->clk);