diff options
Diffstat (limited to 'drivers/mmc/host/sdhci-s3c.c')
-rw-r--r-- | drivers/mmc/host/sdhci-s3c.c | 123 |
1 files changed, 116 insertions, 7 deletions
diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c index ad30f074ee1..71ad4163b95 100644 --- a/drivers/mmc/host/sdhci-s3c.c +++ b/drivers/mmc/host/sdhci-s3c.c @@ -18,6 +18,7 @@ #include <linux/slab.h> #include <linux/clk.h> #include <linux/io.h> +#include <linux/gpio.h> #include <linux/mmc/host.h> @@ -44,6 +45,8 @@ struct sdhci_s3c { struct resource *ioarea; struct s3c_sdhci_platdata *pdata; unsigned int cur_clk; + int ext_cd_irq; + int ext_cd_gpio; struct clk *clk_io; struct clk *clk_bus[MAX_BUS_CLK]; @@ -110,11 +113,6 @@ static unsigned int sdhci_s3c_get_max_clk(struct sdhci_host *host) return max; } -static unsigned int sdhci_s3c_get_timeout_clk(struct sdhci_host *host) -{ - return sdhci_s3c_get_max_clk(host) / 1000000; -} - /** * sdhci_s3c_consider_clock - consider one the bus clocks for current setting * @ourhost: Our SDHCI instance. @@ -188,7 +186,6 @@ static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock) ourhost->cur_clk = best_src; host->max_clk = clk_get_rate(clk); - host->timeout_clk = sdhci_s3c_get_timeout_clk(host); ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2); ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK; @@ -209,12 +206,93 @@ static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock) } } +/** + * sdhci_s3c_get_min_clock - callback to get minimal supported clock value + * @host: The SDHCI host being queried + * + * To init mmc host properly a minimal clock value is needed. For high system + * bus clock's values the standard formula gives values out of allowed range. + * The clock still can be set to lower values, if clock source other then + * system bus is selected. +*/ +static unsigned int sdhci_s3c_get_min_clock(struct sdhci_host *host) +{ + struct sdhci_s3c *ourhost = to_s3c(host); + unsigned int delta, min = UINT_MAX; + int src; + + for (src = 0; src < MAX_BUS_CLK; src++) { + delta = sdhci_s3c_consider_clock(ourhost, src, 0); + if (delta == UINT_MAX) + continue; + /* delta is a negative value in this case */ + if (-delta < min) + min = -delta; + } + return min; +} + static struct sdhci_ops sdhci_s3c_ops = { .get_max_clock = sdhci_s3c_get_max_clk, - .get_timeout_clock = sdhci_s3c_get_timeout_clk, .set_clock = sdhci_s3c_set_clock, + .get_min_clock = sdhci_s3c_get_min_clock, }; +static void sdhci_s3c_notify_change(struct platform_device *dev, int state) +{ + struct sdhci_host *host = platform_get_drvdata(dev); + if (host) { + spin_lock(&host->lock); + if (state) { + dev_dbg(&dev->dev, "card inserted.\n"); + host->flags &= ~SDHCI_DEVICE_DEAD; + host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; + } else { + dev_dbg(&dev->dev, "card removed.\n"); + host->flags |= SDHCI_DEVICE_DEAD; + host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION; + } + tasklet_schedule(&host->card_tasklet); + spin_unlock(&host->lock); + } +} + +static irqreturn_t sdhci_s3c_gpio_card_detect_thread(int irq, void *dev_id) +{ + struct sdhci_s3c *sc = dev_id; + int status = gpio_get_value(sc->ext_cd_gpio); + if (sc->pdata->ext_cd_gpio_invert) + status = !status; + sdhci_s3c_notify_change(sc->pdev, status); + return IRQ_HANDLED; +} + +static void sdhci_s3c_setup_card_detect_gpio(struct sdhci_s3c *sc) +{ + struct s3c_sdhci_platdata *pdata = sc->pdata; + struct device *dev = &sc->pdev->dev; + + if (gpio_request(pdata->ext_cd_gpio, "SDHCI EXT CD") == 0) { + sc->ext_cd_gpio = pdata->ext_cd_gpio; + sc->ext_cd_irq = gpio_to_irq(pdata->ext_cd_gpio); + if (sc->ext_cd_irq && + request_threaded_irq(sc->ext_cd_irq, NULL, + sdhci_s3c_gpio_card_detect_thread, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + dev_name(dev), sc) == 0) { + int status = gpio_get_value(sc->ext_cd_gpio); + if (pdata->ext_cd_gpio_invert) + status = !status; + sdhci_s3c_notify_change(sc->pdev, status); + } else { + dev_warn(dev, "cannot request irq for card detect\n"); + sc->ext_cd_irq = 0; + } + } else { + dev_err(dev, "cannot request gpio for card detect\n"); + } +} + static int __devinit sdhci_s3c_probe(struct platform_device *pdev) { struct s3c_sdhci_platdata *pdata = pdev->dev.platform_data; @@ -252,6 +330,7 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev) sc->host = host; sc->pdev = pdev; sc->pdata = pdata; + sc->ext_cd_gpio = -1; /* invalid gpio number */ platform_set_drvdata(pdev, host); @@ -318,6 +397,7 @@ 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; #ifndef CONFIG_MMC_SDHCI_S3C_DMA @@ -332,15 +412,34 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev) * SDHCI block, or a missing configuration that needs to be set. */ host->quirks |= SDHCI_QUIRK_NO_BUSY_IRQ; + if (pdata->cd_type == S3C_SDHCI_CD_NONE || + pdata->cd_type == S3C_SDHCI_CD_PERMANENT) + host->quirks |= SDHCI_QUIRK_BROKEN_CARD_DETECTION; + + if (pdata->cd_type == S3C_SDHCI_CD_PERMANENT) + host->mmc->caps = MMC_CAP_NONREMOVABLE; + host->quirks |= (SDHCI_QUIRK_32BIT_DMA_ADDR | SDHCI_QUIRK_32BIT_DMA_SIZE); + /* HSMMC on Samsung SoCs uses SDCLK as timeout clock */ + host->quirks |= SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK; + ret = sdhci_add_host(host); if (ret) { dev_err(dev, "sdhci_add_host() failed\n"); goto err_add_host; } + /* The following two methods of card detection might call + sdhci_s3c_notify_change() immediately, so they can be called + only after sdhci_add_host(). Setup errors are ignored. */ + if (pdata->cd_type == S3C_SDHCI_CD_EXTERNAL && pdata->ext_cd_init) + pdata->ext_cd_init(&sdhci_s3c_notify_change); + if (pdata->cd_type == S3C_SDHCI_CD_GPIO && + gpio_is_valid(pdata->ext_cd_gpio)) + sdhci_s3c_setup_card_detect_gpio(sc); + return 0; err_add_host: @@ -365,10 +464,20 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev) static int __devexit sdhci_s3c_remove(struct platform_device *pdev) { + struct s3c_sdhci_platdata *pdata = pdev->dev.platform_data; struct sdhci_host *host = platform_get_drvdata(pdev); struct sdhci_s3c *sc = sdhci_priv(host); int ptr; + if (pdata->cd_type == S3C_SDHCI_CD_EXTERNAL && pdata->ext_cd_cleanup) + pdata->ext_cd_cleanup(&sdhci_s3c_notify_change); + + if (sc->ext_cd_irq) + free_irq(sc->ext_cd_irq, sc); + + if (gpio_is_valid(sc->ext_cd_gpio)) + gpio_free(sc->ext_cd_gpio); + sdhci_remove_host(host, 1); for (ptr = 0; ptr < 3; ptr++) { |