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authorGrant Likely <grant.likely@secretlab.ca>2011-08-23 12:15:33 -0600
committerChris Ball <cjb@laptop.org>2011-10-26 15:43:35 -0400
commit275173b225ae663e54d8dc5c93d79265aad19f89 (patch)
treece6cd20e8d888c74d0eaa3975acee705f239462a /drivers/mmc
parent08da834a24312157f512224691ad1fddd11c1073 (diff)
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>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci-tegra.c51
1 files changed, 40 insertions, 11 deletions
diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 18b0bd31de78..8a114b6211c7 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -17,6 +17,7 @@
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
+#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
@@ -73,10 +74,8 @@ static void tegra_sdhci_writel(struct sdhci_host *host, u32 val, int reg)
static unsigned int tegra_sdhci_get_ro(struct sdhci_host *sdhci)
{
- struct platform_device *pdev = to_platform_device(mmc_dev(sdhci->mmc));
- struct tegra_sdhci_platform_data *plat;
-
- plat = pdev->dev.platform_data;
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(sdhci);
+ struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
if (!gpio_is_valid(plat->wp_gpio))
return -1;
@@ -94,12 +93,10 @@ static irqreturn_t carddetect_irq(int irq, void *data)
static int tegra_sdhci_8bit(struct sdhci_host *host, int bus_width)
{
- struct platform_device *pdev = to_platform_device(mmc_dev(host->mmc));
- struct tegra_sdhci_platform_data *plat;
+ struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+ struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
u32 ctrl;
- plat = pdev->dev.platform_data;
-
ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
if (plat->is_8bit && bus_width == MMC_BUS_WIDTH_8) {
ctrl &= ~SDHCI_CTRL_4BITBUS;
@@ -131,6 +128,34 @@ static struct sdhci_pltfm_data sdhci_tegra_pdata = {
.ops = &tegra_sdhci_ops,
};
+static const struct of_device_id sdhci_tegra_dt_match[] __devinitdata = {
+ { .compatible = "nvidia,tegra20-sdhci", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, sdhci_dt_ids);
+
+static struct tegra_sdhci_platform_data * __devinit sdhci_tegra_dt_parse_pdata(
+ struct platform_device *pdev)
+{
+ struct tegra_sdhci_platform_data *plat;
+ struct device_node *np = pdev->dev.of_node;
+
+ if (!np)
+ return NULL;
+
+ plat = devm_kzalloc(&pdev->dev, sizeof(*plat), GFP_KERNEL);
+ if (!plat) {
+ dev_err(&pdev->dev, "Can't allocate platform data\n");
+ return NULL;
+ }
+
+ plat->cd_gpio = of_get_named_gpio(np, "cd-gpios", 0);
+ plat->wp_gpio = of_get_named_gpio(np, "wp-gpios", 0);
+ plat->power_gpio = of_get_named_gpio(np, "power-gpios", 0);
+
+ return plat;
+}
+
static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
{
struct sdhci_pltfm_host *pltfm_host;
@@ -147,12 +172,17 @@ static int __devinit sdhci_tegra_probe(struct platform_device *pdev)
plat = pdev->dev.platform_data;
+ if (plat == NULL)
+ plat = sdhci_tegra_dt_parse_pdata(pdev);
+
if (plat == NULL) {
dev_err(mmc_dev(host->mmc), "missing platform data\n");
rc = -ENXIO;
goto err_no_plat;
}
+ pltfm_host->priv = plat;
+
if (gpio_is_valid(plat->power_gpio)) {
rc = gpio_request(plat->power_gpio, "sdhci_power");
if (rc) {
@@ -247,13 +277,11 @@ static int __devexit sdhci_tegra_remove(struct platform_device *pdev)
{
struct sdhci_host *host = platform_get_drvdata(pdev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
- struct tegra_sdhci_platform_data *plat;
+ struct tegra_sdhci_platform_data *plat = pltfm_host->priv;
int dead = (readl(host->ioaddr + SDHCI_INT_STATUS) == 0xffffffff);
sdhci_remove_host(host, dead);
- plat = pdev->dev.platform_data;
-
if (gpio_is_valid(plat->wp_gpio)) {
tegra_gpio_disable(plat->wp_gpio);
gpio_free(plat->wp_gpio);
@@ -282,6 +310,7 @@ static struct platform_driver sdhci_tegra_driver = {
.driver = {
.name = "sdhci-tegra",
.owner = THIS_MODULE,
+ .of_match_table = sdhci_tegra_dt_match,
},
.probe = sdhci_tegra_probe,
.remove = __devexit_p(sdhci_tegra_remove),