mmc: sdhci-tegra: Add Device Tree probing support
Add hooks to read gpio configuration out of the device tree node. [grant.likely: Rewrite of original patch from John Bonesio] Signed-off-by: Grant Likely <grant.likely@secretlab.ca> [swarren: Fixed tegra_sdhci_get_ro() to retrieve pdata correctly] [swarren: Reworked to avoid #ifdef CONFIG_OF] [swarren: Reworked binding based on fsl-imx-esdhc.txt] [swarren: Documented binding] Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Chris Ball <cjb@laptop.org>
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Grant Likely
Chris Ball
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08da834a24
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275173b225
25
Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
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25
Documentation/devicetree/bindings/mmc/nvidia-sdhci.txt
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@ -0,0 +1,25 @@
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* NVIDIA Tegra Secure Digital Host Controller
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This controller on Tegra family SoCs provides an interface for MMC, SD,
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and SDIO types of memory cards.
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Required properties:
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- compatible : Should be "nvidia,<chip>-sdhci"
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- reg : Should contain eSDHC registers location and length
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- interrupts : Should contain eSDHC interrupt
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Optional properties:
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- cd-gpios : Specify GPIOs for card detection
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- wp-gpios : Specify GPIOs for write protection
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- power-gpios : Specify GPIOs for power control
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Example:
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sdhci@c8000200 {
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compatible = "nvidia,tegra20-sdhci";
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reg = <0xc8000200 0x200>;
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interrupts = <47>;
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cd-gpios = <&gpio 69 0>; /* gpio PI5 */
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wp-gpios = <&gpio 57 0>; /* gpio PH1 */
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power-gpios = <&gpio 155 0>; /* gpio PT3 */
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};
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@ -17,6 +17,7 @@
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/of_gpio.h>
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#include <linux/gpio.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/host.h>
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@ -73,10 +74,8 @@ static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
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static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
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{
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struct platform_device *pdev = to_platform_device(mmc_dev(sdhci->mmc));
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struct tegra_sdhci_platform_data *plat;
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plat = pdev->dev.platform_data;
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
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struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
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if (!gpio_is_valid(plat->wp_gpio))
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return -1;
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@ -94,12 +93,10 @@ static irqreturn_t carddetect_irq(int irq, void *data)
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static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
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{
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struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
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struct tegra_sdhci_platform_data *plat;
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
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u32 ctrl;
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plat = pdev->dev.platform_data;
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ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
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if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
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ctrl &= ~SDHCI_CTRL_4BITBUS;
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@ -131,6 +128,34 @@ static struct sdhci_pltfm_data sdhci_tegra_pdata = {
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.ops = &tegra_sdhci_ops,
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};
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static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
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{ .compatible = "nvidia,tegra20-sdhci", },
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{}
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};
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MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
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static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
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struct platform_device *pdev)
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{
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struct tegra_sdhci_platform_data *plat;
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struct device_node *np = pdev->dev.of_node;
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if (!np)
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return NULL;
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plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
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if (!plat) {
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dev_err(&pdev->dev, "Can't allocate platform data\n");
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return NULL;
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}
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plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
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plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
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plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
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return plat;
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}
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static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
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{
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struct sdhci_pltfm_host *pltfm_host;
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@ -147,12 +172,17 @@ static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
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plat = pdev->dev.platform_data;
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if (plat == NULL)
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plat = sdhci_tegra_dt_parse_pdata(pdev);
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if (plat == NULL) {
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dev_err(mmc_dev(host->mmc), "missing platform data\n");
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rc = -ENXIO;
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goto err_no_plat;
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}
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pltfm_host->priv = plat;
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if (gpio_is_valid(plat->power_gpio)) {
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rc = gpio_request(plat->power_gpio, "sdhci_power");
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if (rc) {
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@ -247,13 +277,11 @@ static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
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{
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struct sdhci_host *host = platform_get_drvdata(pdev);
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struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
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struct tegra_sdhci_platform_data *plat;
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struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
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int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
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sdhci_remove_host(host, dead);
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plat = pdev->dev.platform_data;
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if (gpio_is_valid(plat->wp_gpio)) {
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tegra_gpio_disable(plat->wp_gpio);
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gpio_free(plat->wp_gpio);
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@ -282,6 +310,7 @@ static struct platform_driver sdhci_tegra_driver = {
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.driver = {
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.name = "sdhci-tegra",
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.owner = THIS_MODULE,
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.of_match_table = sdhci_tegra_dt_match,
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},
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.probe = sdhci_tegra_probe,
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.remove = __devexit_p(sdhci_tegra_remove),
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