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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: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Chris Ball <cjb@laptop.org>
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@ -19,20 +19,30 @@
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <linux/io.h>
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#include <linux/mmc/host.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include "sdhci-pltfm.h"
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struct sdhci_dove_priv {
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struct clk *clk;
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int gpio_cd;
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};
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static irqreturn_t sdhci_dove_carddetect_irq(int irq, void *data)
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{
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struct sdhci_host *host = data;
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tasklet_schedule(&host->card_tasklet);
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return IRQ_HANDLED;
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}
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static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
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{
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u16 ret;
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@ -50,16 +60,25 @@ static u16 sdhci_dove_readw(struct sdhci_host *host, int reg)
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static u32 sdhci_dove_readl(struct sdhci_host *host, int reg)
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{
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct sdhci_dove_priv *priv = pltfm_host->priv;
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u32 ret;
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ret = readl(host->ioaddr + reg);
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switch (reg) {
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case SDHCI_CAPABILITIES:
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ret = readl(host->ioaddr + reg);
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/* Mask the support for 3.0V */
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ret &= ~SDHCI_CAN_VDD_300;
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break;
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default:
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ret = readl(host->ioaddr + reg);
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case SDHCI_PRESENT_STATE:
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if (gpio_is_valid(priv->gpio_cd)) {
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if (gpio_get_value(priv->gpio_cd) == 0)
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ret |= SDHCI_CARD_PRESENT;
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else
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ret &= ~SDHCI_CARD_PRESENT;
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}
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break;
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}
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return ret;
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}
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@ -94,6 +113,23 @@ static int __devinit sdhci_dove_probe(struct platform_device *pdev)
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priv->clk = devm_clk_get(&pdev->dev, NULL);
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if (pdev->dev.of_node) {
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priv->gpio_cd = of_get_named_gpio(pdev->dev.of_node,
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"cd-gpios", 0);
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} else {
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priv->gpio_cd = -EINVAL;
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}
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if (gpio_is_valid(priv->gpio_cd)) {
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ret = gpio_request(priv->gpio_cd, "sdhci-cd");
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if (ret) {
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dev_err(&pdev->dev, "card detect gpio request failed: %d\n",
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ret);
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return ret;
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}
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gpio_direction_input(priv->gpio_cd);
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}
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host = sdhci_pltfm_init(pdev, &sdhci_dove_pdata);
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if (IS_ERR(host)) {
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ret = PTR_ERR(host);
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@ -112,13 +148,33 @@ static int __devinit sdhci_dove_probe(struct platform_device *pdev)
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if (ret)
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goto err_sdhci_add;
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/*
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* We must request the IRQ after sdhci_add_host(), as the tasklet only
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* gets setup in sdhci_add_host() and we oops.
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*/
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if (gpio_is_valid(priv->gpio_cd)) {
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ret = request_irq(gpio_to_irq(priv->gpio_cd),
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sdhci_dove_carddetect_irq,
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IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
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mmc_hostname(host->mmc), host);
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if (ret) {
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dev_err(&pdev->dev, "card detect irq request failed: %d\n",
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ret);
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goto err_request_irq;
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}
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}
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return 0;
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err_request_irq:
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sdhci_remove_host(host, 0);
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err_sdhci_add:
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if (!IS_ERR(priv->clk))
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clk_disable_unprepare(priv->clk);
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sdhci_pltfm_free(pdev);
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err_sdhci_pltfm_init:
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if (gpio_is_valid(priv->gpio_cd))
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gpio_free(priv->gpio_cd);
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return ret;
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}
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@ -130,6 +186,11 @@ static int __devexit sdhci_dove_remove(struct platform_device *pdev)
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sdhci_pltfm_unregister(pdev);
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if (gpio_is_valid(priv->gpio_cd)) {
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free_irq(gpio_to_irq(priv->gpio_cd), host);
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gpio_free(priv->gpio_cd);
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}
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if (!IS_ERR(priv->clk))
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clk_disable_unprepare(priv->clk);
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