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>hifive-unleashed-5.1
Grant Likely
Chris Ball
parent
08da834a24
commit
275173b225
|
|
@ -0,0 +1,25 @@
|
|||
* NVIDIA Tegra Secure Digital Host Controller
|
||||
|
||||
This controller on Tegra family SoCs provides an interface for MMC, SD,
|
||||
and SDIO types of memory cards.
|
||||
|
||||
Required properties:
|
||||
- compatible : Should be "nvidia,<chip>-sdhci"
|
||||
- reg : Should contain eSDHC registers location and length
|
||||
- interrupts : Should contain eSDHC interrupt
|
||||
|
||||
Optional properties:
|
||||
- cd-gpios : Specify GPIOs for card detection
|
||||
- wp-gpios : Specify GPIOs for write protection
|
||||
- power-gpios : Specify GPIOs for power control
|
||||
|
||||
Example:
|
||||
|
||||
sdhci@c8000200 {
|
||||
compatible = "nvidia,tegra20-sdhci";
|
||||
reg = <0xc8000200 0x200>;
|
||||
interrupts = <47>;
|
||||
cd-gpios = <&gpio 69 0>; /* gpio PI5 */
|
||||
wp-gpios = <&gpio 57 0>; /* gpio PH1 */
|
||||
power-gpios = <&gpio 155 0>; /* gpio PT3 */
|
||||
};
|
||||
|
|
@ -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),
|
||||
|
|
|
|||
Loading…
Reference in New Issue