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path: root/drivers/mmc/host/sdhci-s3c.c
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Diffstat (limited to 'drivers/mmc/host/sdhci-s3c.c')
-rw-r--r--drivers/mmc/host/sdhci-s3c.c159
1 files changed, 125 insertions, 34 deletions
diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index b19e7d435f8d..55a164fcaa15 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -20,6 +20,10 @@
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
#include <linux/mmc/host.h>
@@ -53,6 +57,18 @@ struct sdhci_s3c {
struct clk *clk_bus[MAX_BUS_CLK];
};
+/**
+ * struct sdhci_s3c_driver_data - S3C SDHCI platform specific driver data
+ * @sdhci_quirks: sdhci host specific quirks.
+ *
+ * Specifies platform specific configuration of sdhci controller.
+ * Note: A structure for driver specific platform data is used for future
+ * expansion of its usage.
+ */
+struct sdhci_s3c_drv_data {
+ unsigned int sdhci_quirks;
+};
+
static inline struct sdhci_s3c *to_s3c(struct sdhci_host *host)
{
return sdhci_priv(host);
@@ -132,10 +148,10 @@ static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
return UINT_MAX;
/*
- * Clock divider's step is different as 1 from that of host controller
- * when 'clk_type' is S3C_SDHCI_CLK_DIV_EXTERNAL.
+ * If controller uses a non-standard clock division, find the best clock
+ * speed possible with selected clock source and skip the division.
*/
- if (ourhost->pdata->clk_type) {
+ if (ourhost->host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK) {
rate = clk_round_rate(clksrc, wanted);
return wanted - rate;
}
@@ -272,6 +288,8 @@ static unsigned int sdhci_cmu_get_min_clock(struct sdhci_host *host)
static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
{
struct sdhci_s3c *ourhost = to_s3c(host);
+ unsigned long timeout;
+ u16 clk = 0;
/* don't bother if the clock is going off */
if (clock == 0)
@@ -282,6 +300,25 @@ static void sdhci_cmu_set_clock(struct sdhci_host *host, unsigned int clock)
clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
host->clock = clock;
+
+ clk = SDHCI_CLOCK_INT_EN;
+ sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+ /* Wait max 20 ms */
+ timeout = 20;
+ while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
+ & SDHCI_CLOCK_INT_STABLE)) {
+ if (timeout == 0) {
+ printk(KERN_ERR "%s: Internal clock never "
+ "stabilised.\n", mmc_hostname(host->mmc));
+ return;
+ }
+ timeout--;
+ mdelay(1);
+ }
+
+ clk |= SDHCI_CLOCK_CARD_EN;
+ sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
}
/**
@@ -382,16 +419,24 @@ static void sdhci_s3c_setup_card_detect_gpio(struct sdhci_s3c *sc)
}
}
+static inline struct sdhci_s3c_drv_data *sdhci_s3c_get_driver_data(
+ struct platform_device *pdev)
+{
+ return (struct sdhci_s3c_drv_data *)
+ platform_get_device_id(pdev)->driver_data;
+}
+
static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
{
- struct s3c_sdhci_platdata *pdata = pdev->dev.platform_data;
+ struct s3c_sdhci_platdata *pdata;
+ struct sdhci_s3c_drv_data *drv_data;
struct device *dev = &pdev->dev;
struct sdhci_host *host;
struct sdhci_s3c *sc;
struct resource *res;
int ret, irq, ptr, clks;
- if (!pdata) {
+ if (!pdev->dev.platform_data) {
dev_err(dev, "no device data specified\n");
return -ENOENT;
}
@@ -402,18 +447,20 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
return irq;
}
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(dev, "no memory specified\n");
- return -ENOENT;
- }
-
host = sdhci_alloc_host(dev, sizeof(struct sdhci_s3c));
if (IS_ERR(host)) {
dev_err(dev, "sdhci_alloc_host() failed\n");
return PTR_ERR(host);
}
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ ret = -ENOMEM;
+ goto err_io_clk;
+ }
+ memcpy(pdata, pdev->dev.platform_data, sizeof(*pdata));
+
+ drv_data = sdhci_s3c_get_driver_data(pdev);
sc = sdhci_priv(host);
sc->host = host;
@@ -464,15 +511,8 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
goto err_no_busclks;
}
- sc->ioarea = request_mem_region(res->start, resource_size(res),
- mmc_hostname(host->mmc));
- if (!sc->ioarea) {
- dev_err(dev, "failed to reserve register area\n");
- ret = -ENXIO;
- goto err_req_regs;
- }
-
- host->ioaddr = ioremap_nocache(res->start, resource_size(res));
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ host->ioaddr = devm_request_and_ioremap(&pdev->dev, res);
if (!host->ioaddr) {
dev_err(dev, "failed to map registers\n");
ret = -ENXIO;
@@ -491,6 +531,8 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
/* Setup quirks for the controller */
host->quirks |= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC;
host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
+ if (drv_data)
+ host->quirks |= drv_data->sdhci_quirks;
#ifndef CONFIG_MMC_SDHCI_S3C_DMA
@@ -518,6 +560,14 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT)
host->mmc->caps = MMC_CAP_NONREMOVABLE;
+ switch (pdata->max_width) {
+ case 8:
+ host->mmc->caps |= MMC_CAP_8_BIT_DATA;
+ case 4:
+ host->mmc->caps |= MMC_CAP_4_BIT_DATA;
+ break;
+ }
+
if (pdata->pm_caps)
host->mmc->pm_caps |= pdata->pm_caps;
@@ -531,7 +581,7 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
* If controller does not have internal clock divider,
* we can use overriding functions instead of default.
*/
- if (pdata->clk_type) {
+ if (host->quirks & SDHCI_QUIRK_NONSTANDARD_CLOCK) {
sdhci_s3c_ops.set_clock = sdhci_cmu_set_clock;
sdhci_s3c_ops.get_min_clock = sdhci_cmu_get_min_clock;
sdhci_s3c_ops.get_max_clock = sdhci_cmu_get_max_clock;
@@ -544,10 +594,17 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
if (pdata->host_caps2)
host->mmc->caps2 |= pdata->host_caps2;
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_suspend_ignore_children(&pdev->dev, 1);
+
ret = sdhci_add_host(host);
if (ret) {
dev_err(dev, "sdhci_add_host() failed\n");
- goto err_add_host;
+ pm_runtime_forbid(&pdev->dev);
+ pm_runtime_get_noresume(&pdev->dev);
+ goto err_req_regs;
}
/* The following two methods of card detection might call
@@ -561,10 +618,6 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
return 0;
- err_add_host:
- release_resource(sc->ioarea);
- kfree(sc->ioarea);
-
err_req_regs:
for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
if (sc->clk_bus[ptr]) {
@@ -601,6 +654,8 @@ static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
sdhci_remove_host(host, 1);
+ pm_runtime_disable(&pdev->dev);
+
for (ptr = 0; ptr < 3; ptr++) {
if (sc->clk_bus[ptr]) {
clk_disable(sc->clk_bus[ptr]);
@@ -610,18 +665,13 @@ static int __devexit sdhci_s3c_remove(struct platform_device *pdev)
clk_disable(sc->clk_io);
clk_put(sc->clk_io);
- iounmap(host->ioaddr);
- release_resource(sc->ioarea);
- kfree(sc->ioarea);
-
sdhci_free_host(host);
platform_set_drvdata(pdev, NULL);
return 0;
}
-#ifdef CONFIG_PM
-
+#ifdef CONFIG_PM_SLEEP
static int sdhci_s3c_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
@@ -635,10 +685,29 @@ static int sdhci_s3c_resume(struct device *dev)
return sdhci_resume_host(host);
}
+#endif
+
+#ifdef CONFIG_PM_RUNTIME
+static int sdhci_s3c_runtime_suspend(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+
+ return sdhci_runtime_suspend_host(host);
+}
+static int sdhci_s3c_runtime_resume(struct device *dev)
+{
+ struct sdhci_host *host = dev_get_drvdata(dev);
+
+ return sdhci_runtime_resume_host(host);
+}
+#endif
+
+#ifdef CONFIG_PM
static const struct dev_pm_ops sdhci_s3c_pmops = {
- .suspend = sdhci_s3c_suspend,
- .resume = sdhci_s3c_resume,
+ SET_SYSTEM_SLEEP_PM_OPS(sdhci_s3c_suspend, sdhci_s3c_resume)
+ SET_RUNTIME_PM_OPS(sdhci_s3c_runtime_suspend, sdhci_s3c_runtime_resume,
+ NULL)
};
#define SDHCI_S3C_PMOPS (&sdhci_s3c_pmops)
@@ -647,9 +716,31 @@ static const struct dev_pm_ops sdhci_s3c_pmops = {
#define SDHCI_S3C_PMOPS NULL
#endif
+#if defined(CONFIG_CPU_EXYNOS4210) || defined(CONFIG_SOC_EXYNOS4212)
+static struct sdhci_s3c_drv_data exynos4_sdhci_drv_data = {
+ .sdhci_quirks = SDHCI_QUIRK_NONSTANDARD_CLOCK,
+};
+#define EXYNOS4_SDHCI_DRV_DATA ((kernel_ulong_t)&exynos4_sdhci_drv_data)
+#else
+#define EXYNOS4_SDHCI_DRV_DATA ((kernel_ulong_t)NULL)
+#endif
+
+static struct platform_device_id sdhci_s3c_driver_ids[] = {
+ {
+ .name = "s3c-sdhci",
+ .driver_data = (kernel_ulong_t)NULL,
+ }, {
+ .name = "exynos4-sdhci",
+ .driver_data = EXYNOS4_SDHCI_DRV_DATA,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, sdhci_s3c_driver_ids);
+
static struct platform_driver sdhci_s3c_driver = {
.probe = sdhci_s3c_probe,
.remove = __devexit_p(sdhci_s3c_remove),
+ .id_table = sdhci_s3c_driver_ids,
.driver = {
.owner = THIS_MODULE,
.name = "s3c-sdhci",