From 0c6d49ce53bc18c0ac637fb137f1e01ee9082201 Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Sat, 26 Feb 2011 14:44:39 +0100 Subject: [PATCH] mmc: sdhci-esdhc-imx: add write protect on custom GPIO on mx25/35 Signed-off-by: Wolfram Sang Tested-by: Marc Reilly Tested-by: Eric Benard Signed-off-by: Chris Ball --- arch/arm/plat-mxc/include/mach/esdhc.h | 10 ++++++- drivers/mmc/host/sdhci-esdhc-imx.c | 52 +++++++++++++++++++++++++++------- 2 files changed, 50 insertions(+), 12 deletions(-) diff --git a/arch/arm/plat-mxc/include/mach/esdhc.h b/arch/arm/plat-mxc/include/mach/esdhc.h index a48a9aaa56b..47da109ce09 100644 --- a/arch/arm/plat-mxc/include/mach/esdhc.h +++ b/arch/arm/plat-mxc/include/mach/esdhc.h @@ -10,7 +10,15 @@ #ifndef __ASM_ARCH_IMX_ESDHC_H #define __ASM_ARCH_IMX_ESDHC_H +/** + * struct esdhc_platform_data - optional platform data for esdhc on i.MX + * + * strongly recommended for i.MX25/35, not needed for other variants + * + * @wp_gpio: gpio for write_protect (-EINVAL if unused) + */ + struct esdhc_platform_data { - unsigned int wp_gpio; /* write protect pin */ + unsigned int wp_gpio; }; #endif /* __ASM_ARCH_IMX_ESDHC_H */ diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index 9b82910b9db..65df00bb00d 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -15,9 +15,11 @@ #include #include #include +#include #include #include #include +#include #include "sdhci.h" #include "sdhci-pltfm.h" #include "sdhci-esdhc.h" @@ -100,10 +102,31 @@ 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; + + if (boarddata && gpio_is_valid(boarddata->wp_gpio)) + return gpio_get_value(boarddata->wp_gpio); + else + return -ENOSYS; +} + +static struct sdhci_ops sdhci_esdhc_ops = { + .read_w = esdhc_readw_le, + .write_w = esdhc_writew_le, + .write_b = esdhc_writeb_le, + .set_clock = esdhc_set_clock, + .get_max_clock = esdhc_pltfm_get_max_clock, + .get_min_clock = esdhc_pltfm_get_min_clock, +}; + static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pdata) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct esdhc_platform_data *boarddata = host->mmc->parent->platform_data; struct clk *clk; + int err; clk = clk_get(mmc_dev(host->mmc), NULL); if (IS_ERR(clk)) { @@ -116,9 +139,21 @@ static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pd if (cpu_is_mx35() || cpu_is_mx51()) host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL; - /* Fix errata ENGcm07207 which is present on i.MX25 and i.MX35 */ - 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 (boarddata) { + 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; + } + } return 0; } @@ -126,20 +161,15 @@ static int esdhc_pltfm_init(struct sdhci_host *host, struct sdhci_pltfm_data *pd static void esdhc_pltfm_exit(struct sdhci_host *host) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct esdhc_platform_data *boarddata = host->mmc->parent->platform_data; + + if (boarddata && gpio_is_valid(boarddata->wp_gpio)) + gpio_free(boarddata->wp_gpio); clk_disable(pltfm_host->clk); clk_put(pltfm_host->clk); } -static struct sdhci_ops sdhci_esdhc_ops = { - .read_w = esdhc_readw_le, - .write_w = esdhc_writew_le, - .write_b = esdhc_writeb_le, - .set_clock = esdhc_set_clock, - .get_max_clock = esdhc_pltfm_get_max_clock, - .get_min_clock = esdhc_pltfm_get_min_clock, -}; - struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = { .quirks = ESDHC_DEFAULT_QUIRKS | SDHCI_QUIRK_BROKEN_ADMA, /* ADMA has issues. Might be fixable */ -- 2.11.4.GIT