1 files changed, 70 insertions, 4 deletions

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index b19e7d435f8d..5fce14385910 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -53,6 +53,18 @@ 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 +144,10 @@ 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 +284,8 @@ 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 +296,25 @@ 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);
 }
 
 /**
@@ -382,9 +415,17 @@ 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 sdhci_s3c_drv_data *drv_data;
         struct device *dev = &pdev->dev;
         struct sdhci_host *host;
         struct sdhci_s3c *sc;
@@ -414,6 +455,7 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
                 return PTR_ERR(host);
         }
 
+        drv_data = sdhci_s3c_get_driver_data(pdev);
         sc = sdhci_priv(host);
 
         sc->host = host;
@@ -491,6 +533,8 @@ 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
 
@@ -531,7 +575,7 @@ 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;
@@ -647,9 +691,31 @@ 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",