diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/sdhci-s3c.c | 74 |
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", |