From 913413c307c919f8b21edccea23a9fd9d9d49a64 Mon Sep 17 00:00:00 2001 From: Shawn Guo Date: Tue, 21 Jun 2011 22:41:51 +0800 Subject: mmc: sdhci-esdhc-imx: extend card_detect and write_protect support for mx5 The patch extends card_detect and write_protect support to get mx5 family and more scenarios supported. The changes include: * Turn platform_data from optional to mandatory * Add cd_types and wp_types into platform_data to cover more use cases * Remove the use of flag ESDHC_FLAG_GPIO_FOR_CD * Adjust some machine codes to adopt the platform_data changes * Work around the issue that software reset will get card detection circuit stop working With this patch, card_detect and write_protect gets supported on mx5 based platforms. Signed-off-by: Shawn Guo Cc: Chris Ball Acked-by: Wolfram Sang Tested-by: Arnaud Patard Acked-by: Chris Ball --- drivers/mmc/host/sdhci-esdhc-imx.c | 138 +++++++++++++++++++++++-------------- 1 file changed, 87 insertions(+), 51 deletions(-) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 710b706..4269bb4 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -29,7 +29,6 @@ #define SDHCI_VENDOR_SPEC 0xC0 #define SDHCI_VENDOR_SPEC_SDIO_QUIRK 0x00000002 -#define ESDHC_FLAG_GPIO_FOR_CD (1 << 0) /* * The CMDTYPE of the CMD register (offset 0xE) should be set to * "11" when the STOP CMD12 is issued on imx53 to abort one @@ -58,19 +57,15 @@ static inline void esdhc_clrset_le(struct sdhci_host *host, u32 mask, u32 val, i static u32 esdhc_readl_le(struct sdhci_host *host, int reg) { - struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); - struct pltfm_imx_data *imx_data = pltfm_host->priv; + struct esdhc_platform_data *boarddata = + host->mmc->parent->platform_data; - /* fake CARD_PRESENT flag on mx25/35 */ + /* fake CARD_PRESENT flag */ u32 val = readl(host->ioaddr + reg); if (unlikely((reg == SDHCI_PRESENT_STATE) - && (imx_data->flags & ESDHC_FLAG_GPIO_FOR_CD))) { - struct esdhc_platform_data *boarddata = - host->mmc->parent->platform_data; - - if (boarddata && gpio_is_valid(boarddata->cd_gpio) - && gpio_get_value(boarddata->cd_gpio)) + && gpio_is_valid(boarddata->cd_gpio))) { + if (gpio_get_value(boarddata->cd_gpio)) /* no card, if a valid gpio says so... */ val &= ~SDHCI_CARD_PRESENT; else @@ -85,12 +80,13 @@ static void esdhc_writel_le(struct sdhci_host *host, u32 val, int reg) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct pltfm_imx_data *imx_data = pltfm_host->priv; + struct esdhc_platform_data *boarddata = + host->mmc->parent->platform_data; if (unlikely((reg == SDHCI_INT_ENABLE || reg == SDHCI_SIGNAL_ENABLE) - && (imx_data->flags & ESDHC_FLAG_GPIO_FOR_CD))) + && (boarddata->cd_type == ESDHC_CD_GPIO))) /* * these interrupts won't work with a custom card_detect gpio - * (only applied to mx25/35) */ val &= ~(SDHCI_INT_CARD_REMOVE | SDHCI_INT_CARD_INSERT); @@ -173,6 +169,17 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg) return; } esdhc_clrset_le(host, 0xff, val, reg); + + /* + * The esdhc has a design violation to SDHC spec which tells + * that software reset should not affect card detection circuit. + * But esdhc clears its SYSCTL register bits [0..2] during the + * software reset. This will stop those clocks that card detection + * circuit relies on. To work around it, we turn the clocks on back + * to keep card detection circuit functional. + */ + if ((reg == SDHCI_SOFTWARE_RESET) && (val & 1)) + esdhc_clrset_le(host, 0x7, 0x7, ESDHC_SYSTEM_CONTROL); } static unsigned int esdhc_pltfm_get_max_clock(struct sdhci_host *host) @@ -189,6 +196,25 @@ static unsigned int esdhc_pltfm_get_min_clock(struct sdhci_host *host) return clk_get_rate(pltfm_host->clk) / 256 / 16; } +static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host) +{ + struct esdhc_platform_data *boarddata = + host->mmc->parent->platform_data; + + switch (boarddata->wp_type) { + case ESDHC_WP_GPIO: + if (gpio_is_valid(boarddata->wp_gpio)) + return gpio_get_value(boarddata->wp_gpio); + case ESDHC_WP_CONTROLLER: + return !(readl(host->ioaddr + SDHCI_PRESENT_STATE) & + SDHCI_WRITE_PROTECT); + case ESDHC_WP_NONE: + break; + } + + return -ENOSYS; +} + static struct sdhci_ops sdhci_esdhc_ops = { .read_l = esdhc_readl_le, .read_w = esdhc_readw_le, @@ -198,6 +224,7 @@ static struct sdhci_ops sdhci_esdhc_ops = { .set_clock = esdhc_set_clock, .get_max_clock = esdhc_pltfm_get_max_clock, .get_min_clock = esdhc_pltfm_get_min_clock, + .get_ro = esdhc_pltfm_get_ro, }; static struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = { @@ -207,17 +234,6 @@ static struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = { .ops = &sdhci_esdhc_ops, }; -static unsigned int esdhc_pltfm_get_ro(struct sdhci_host *host) -{ - struct esdhc_platform_data *boarddata = - host->mmc->parent->platform_data; - - if (boarddata && gpio_is_valid(boarddata->wp_gpio)) - return gpio_get_value(boarddata->wp_gpio); - else - return -ENOSYS; -} - static irqreturn_t cd_irq(int irq, void *data) { struct sdhci_host *sdhost = (struct sdhci_host *)data; @@ -258,47 +274,65 @@ static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev) if (!cpu_is_mx25()) host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; - if (cpu_is_mx25() || cpu_is_mx35()) { + if (cpu_is_mx25() || cpu_is_mx35()) /* Fix errata ENGcm07207 present on i.MX25 and i.MX35 */ host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK; - /* write_protect can't be routed to controller, use gpio */ - sdhci_esdhc_ops.get_ro = esdhc_pltfm_get_ro; - } if (!(cpu_is_mx25() || cpu_is_mx35() || cpu_is_mx51())) imx_data->flags |= ESDHC_FLAG_MULTIBLK_NO_INT; boarddata = host->mmc->parent->platform_data; - if (boarddata) { + if (!boarddata) { + dev_err(mmc_dev(host->mmc), "no board data!\n"); + err = -EINVAL; + goto no_board_data; + } + + /* write_protect */ + if (boarddata->wp_type == ESDHC_WP_GPIO) { err = gpio_request_one(boarddata->wp_gpio, GPIOF_IN, "ESDHC_WP"); if (err) { dev_warn(mmc_dev(host->mmc), - "no write-protect pin available!\n"); - boarddata->wp_gpio = err; + "no write-protect pin available!\n"); + boarddata->wp_gpio = -EINVAL; } + } else { + boarddata->wp_gpio = -EINVAL; + } + + /* card_detect */ + if (boarddata->cd_type != ESDHC_CD_GPIO) + boarddata->cd_gpio = -EINVAL; + switch (boarddata->cd_type) { + case ESDHC_CD_GPIO: err = gpio_request_one(boarddata->cd_gpio, GPIOF_IN, "ESDHC_CD"); if (err) { - dev_warn(mmc_dev(host->mmc), + dev_err(mmc_dev(host->mmc), "no card-detect pin available!\n"); goto no_card_detect_pin; } - /* i.MX5x has issues to be researched */ - if (!cpu_is_mx25() && !cpu_is_mx35()) - goto not_supported; - err = request_irq(gpio_to_irq(boarddata->cd_gpio), cd_irq, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, mmc_hostname(host->mmc), host); if (err) { - dev_warn(mmc_dev(host->mmc), "request irq error\n"); + dev_err(mmc_dev(host->mmc), "request irq error\n"); goto no_card_detect_irq; } + /* fall through */ - imx_data->flags |= ESDHC_FLAG_GPIO_FOR_CD; - /* Now we have a working card_detect again */ + case ESDHC_CD_CONTROLLER: + /* we have a working card_detect back */ host->quirks &= ~SDHCI_QUIRK_BROKEN_CARD_DETECTION; + break; + + case ESDHC_CD_PERMANENT: + host->mmc->caps = MMC_CAP_NONREMOVABLE; + break; + + case ESDHC_CD_NONE: + break; } err = sdhci_add_host(host); @@ -307,16 +341,20 @@ static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev) return 0; - no_card_detect_irq: - gpio_free(boarddata->cd_gpio); - no_card_detect_pin: - boarddata->cd_gpio = err; - not_supported: - kfree(imx_data); - err_add_host: +err_add_host: + if (gpio_is_valid(boarddata->cd_gpio)) + free_irq(gpio_to_irq(boarddata->cd_gpio), host); +no_card_detect_irq: + if (gpio_is_valid(boarddata->cd_gpio)) + gpio_free(boarddata->cd_gpio); + if (gpio_is_valid(boarddata->wp_gpio)) + gpio_free(boarddata->wp_gpio); +no_card_detect_pin: +no_board_data: clk_disable(pltfm_host->clk); clk_put(pltfm_host->clk); - err_clk_get: +err_clk_get: + kfree(imx_data); sdhci_pltfm_free(pdev); return err; } @@ -331,14 +369,12 @@ static int __devexit sdhci_esdhc_imx_remove(struct platform_device *pdev) sdhci_remove_host(host, dead); - if (boarddata && gpio_is_valid(boarddata->wp_gpio)) + if (gpio_is_valid(boarddata->wp_gpio)) gpio_free(boarddata->wp_gpio); - if (boarddata && gpio_is_valid(boarddata->cd_gpio)) { + if (gpio_is_valid(boarddata->cd_gpio)) { + free_irq(gpio_to_irq(boarddata->cd_gpio), host); gpio_free(boarddata->cd_gpio); - - if (!(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)) - free_irq(gpio_to_irq(boarddata->cd_gpio), host); } clk_disable(pltfm_host->clk); -- cgit v1.1