[PATCH v2 4/4] mmc: sdhci-esdhc-imx: extend card_detect and write_protect support for mx5
Wolfram Sang
w.sang at pengutronix.de
Tue Jun 14 05:51:29 EDT 2011
On Tue, Jun 14, 2011 at 02:47:39PM +0800, Shawn Guo wrote:
> 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
>
> With this patch, card_detect and write_protect gets supported on
> mx51_babbage, and other mx5 machines can easily get there with the
> least board level configuration added.
>
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
No time for a full review, but it looks a lot like going into the right
direction. Thanks.
A few comments:
> ---
> Changes since v1:
> * Took the suggestion from Arnaud Patard to add default pdata
> in imx_add_sdhci_esdhc_imx(), to avoid touching every single
> board file for the platform_data changes
>
> arch/arm/mach-imx/eukrea_mbimxsd25-baseboard.c | 3 +-
> arch/arm/mach-imx/eukrea_mbimxsd35-baseboard.c | 3 +-
> arch/arm/mach-imx/mach-mx25_3ds.c | 2 +
> arch/arm/mach-imx/mach-pcm043.c | 2 +
> arch/arm/mach-mx5/board-mx51_babbage.c | 27 +++++-
> .../plat-mxc/devices/platform-sdhci-esdhc-imx.c | 12 ++
> arch/arm/plat-mxc/include/mach/esdhc.h | 25 ++++-
> drivers/mmc/host/sdhci-esdhc-imx.c | 115 +++++++++++---------
> 8 files changed, 130 insertions(+), 59 deletions(-)
>
> diff --git a/arch/arm/mach-imx/eukrea_mbimxsd25-baseboard.c b/arch/arm/mach-imx/eukrea_mbimxsd25-baseboard.c
> index 01ebcb3..66e8726 100644
> --- a/arch/arm/mach-imx/eukrea_mbimxsd25-baseboard.c
> +++ b/arch/arm/mach-imx/eukrea_mbimxsd25-baseboard.c
> @@ -225,7 +225,8 @@ struct imx_ssi_platform_data eukrea_mbimxsd_ssi_pdata __initconst = {
>
> static struct esdhc_platform_data sd1_pdata = {
> .cd_gpio = GPIO_SD1CD,
> - .wp_gpio = -EINVAL,
> + .cd_type = ESDHC_CD_GPIO,
> + .wp_type = ESDHC_WP_NONE,
> };
>
> /*
> diff --git a/arch/arm/mach-imx/eukrea_mbimxsd35-baseboard.c b/arch/arm/mach-imx/eukrea_mbimxsd35-baseboard.c
> index 558eb52..0f0af02 100644
> --- a/arch/arm/mach-imx/eukrea_mbimxsd35-baseboard.c
> +++ b/arch/arm/mach-imx/eukrea_mbimxsd35-baseboard.c
> @@ -236,7 +236,8 @@ struct imx_ssi_platform_data eukrea_mbimxsd_ssi_pdata __initconst = {
>
> static struct esdhc_platform_data sd1_pdata = {
> .cd_gpio = GPIO_SD1CD,
> - .wp_gpio = -EINVAL,
> + .cd_type = ESDHC_CD_GPIO,
> + .wp_type = ESDHC_WP_NONE,
> };
>
> /*
> diff --git a/arch/arm/mach-imx/mach-mx25_3ds.c b/arch/arm/mach-imx/mach-mx25_3ds.c
> index 01534bb..7f66a91 100644
> --- a/arch/arm/mach-imx/mach-mx25_3ds.c
> +++ b/arch/arm/mach-imx/mach-mx25_3ds.c
> @@ -215,6 +215,8 @@ static const struct imxi2c_platform_data mx25_3ds_i2c0_data __initconst = {
> static const struct esdhc_platform_data mx25pdk_esdhc_pdata __initconst = {
> .wp_gpio = SD1_GPIO_WP,
> .cd_gpio = SD1_GPIO_CD,
> + .wp_type = ESDHC_WP_GPIO,
> + .cd_type = ESDHC_CD_GPIO,
> };
>
> static void __init mx25pdk_init(void)
> diff --git a/arch/arm/mach-imx/mach-pcm043.c b/arch/arm/mach-imx/mach-pcm043.c
> index 163cc31..660ec3e 100644
> --- a/arch/arm/mach-imx/mach-pcm043.c
> +++ b/arch/arm/mach-imx/mach-pcm043.c
> @@ -349,6 +349,8 @@ __setup("otg_mode=", pcm043_otg_mode);
> static struct esdhc_platform_data sd1_pdata = {
> .wp_gpio = SD1_GPIO_WP,
> .cd_gpio = SD1_GPIO_CD,
> + .wp_type = ESDHC_WP_GPIO,
> + .cd_type = ESDHC_CD_GPIO,
> };
>
> /*
> diff --git a/arch/arm/mach-mx5/board-mx51_babbage.c b/arch/arm/mach-mx5/board-mx51_babbage.c
> index e54e4bf..4db6cf9 100644
> --- a/arch/arm/mach-mx5/board-mx51_babbage.c
> +++ b/arch/arm/mach-mx5/board-mx51_babbage.c
> @@ -34,6 +34,8 @@
> #include "devices.h"
> #include "cpu_op-mx51.h"
>
> +#define BABBAGE_ESDHC2_WP IMX_GPIO_NR(1, 5)
> +#define BABBAGE_ESDHC2_CD IMX_GPIO_NR(1, 6)
> #define BABBAGE_USB_HUB_RESET IMX_GPIO_NR(1, 7)
> #define BABBAGE_USBH1_STP IMX_GPIO_NR(1, 27)
> #define BABBAGE_USB_PHY_RESET IMX_GPIO_NR(2, 5)
> @@ -142,6 +144,10 @@ static iomux_v3_cfg_t mx51babbage_pads[] = {
> MX51_PAD_SD1_DATA1__SD1_DATA1,
> MX51_PAD_SD1_DATA2__SD1_DATA2,
> MX51_PAD_SD1_DATA3__SD1_DATA3,
> + /* CD signal */
> + MX51_PAD_GPIO1_0__SD1_CD,
> + /* WP signal */
> + MX51_PAD_GPIO1_1__SD1_WP,
>
> /* SD 2 */
> MX51_PAD_SD2_CMD__SD2_CMD,
> @@ -150,6 +156,11 @@ static iomux_v3_cfg_t mx51babbage_pads[] = {
> MX51_PAD_SD2_DATA1__SD2_DATA1,
> MX51_PAD_SD2_DATA2__SD2_DATA2,
> MX51_PAD_SD2_DATA3__SD2_DATA3,
> + /* WP gpio */
> + MX51_PAD_GPIO1_5__GPIO1_5,
> + /* CD gpio */
> + MX51_PAD_GPIO1_6__GPIO1_6,
> +
>
> /* eCSPI1 */
> MX51_PAD_CSPI1_MISO__ECSPI1_MISO,
> @@ -331,6 +342,18 @@ static const struct spi_imx_master mx51_babbage_spi_pdata __initconst = {
> .num_chipselect = ARRAY_SIZE(mx51_babbage_spi_cs),
> };
>
> +static const struct esdhc_platform_data esdhc1_pdata __initconst = {
> + .wp_type = ESDHC_WP_SIGNAL,
> + .cd_type = ESDHC_CD_SIGNAL,
> +};
> +
> +static const struct esdhc_platform_data esdhc2_pdata __initconst = {
> + .wp_gpio = BABBAGE_ESDHC2_WP,
> + .cd_gpio = BABBAGE_ESDHC2_CD,
> + .wp_type = ESDHC_WP_GPIO,
> + .cd_type = ESDHC_CD_GPIO,
> +};
> +
> /*
> * Board specific initialization.
> */
> @@ -376,8 +399,8 @@ static void __init mx51_babbage_init(void)
> mxc_iomux_v3_setup_pad(usbh1stp);
> babbage_usbhub_reset();
>
> - imx51_add_sdhci_esdhc_imx(0, NULL);
> - imx51_add_sdhci_esdhc_imx(1, NULL);
> + imx51_add_sdhci_esdhc_imx(0, &esdhc1_pdata);
> + imx51_add_sdhci_esdhc_imx(1, &esdhc2_pdata);
>
> spi_register_board_info(mx51_babbage_spi_board_info,
> ARRAY_SIZE(mx51_babbage_spi_board_info));
> diff --git a/arch/arm/plat-mxc/devices/platform-sdhci-esdhc-imx.c b/arch/arm/plat-mxc/devices/platform-sdhci-esdhc-imx.c
> index 6b2940b..a880f73 100644
> --- a/arch/arm/plat-mxc/devices/platform-sdhci-esdhc-imx.c
> +++ b/arch/arm/plat-mxc/devices/platform-sdhci-esdhc-imx.c
> @@ -65,6 +65,11 @@ imx53_sdhci_esdhc_imx_data[] __initconst = {
> };
> #endif /* ifdef CONFIG_SOC_IMX53 */
>
> +static const struct esdhc_platform_data default_esdhc_pdata __initconst = {
> + .wp_type = ESDHC_WP_NONE,
> + .cd_type = ESDHC_CD_NONE,
> +};
> +
> struct platform_device *__init imx_add_sdhci_esdhc_imx(
> const struct imx_sdhci_esdhc_imx_data *data,
> const struct esdhc_platform_data *pdata)
> @@ -81,6 +86,13 @@ struct platform_device *__init imx_add_sdhci_esdhc_imx(
> },
> };
>
> + /*
> + * If machine does not provide a pdata, use the default one
s/a pdata/pdata/ (not 100% sure, though)
> + * which means none WP/CD support
s/none/no/
> + */
> + if (!pdata)
> + pdata = &default_esdhc_pdata;
> +
> return imx_add_platform_device("sdhci-esdhc-imx", data->id, res,
> ARRAY_SIZE(res), pdata, sizeof(*pdata));
> }
> diff --git a/arch/arm/plat-mxc/include/mach/esdhc.h b/arch/arm/plat-mxc/include/mach/esdhc.h
> index 86003f4..fced348 100644
> --- a/arch/arm/plat-mxc/include/mach/esdhc.h
> +++ b/arch/arm/plat-mxc/include/mach/esdhc.h
> @@ -10,17 +10,32 @@
> #ifndef __ASM_ARCH_IMX_ESDHC_H
> #define __ASM_ARCH_IMX_ESDHC_H
>
> +enum wp_types {
> + ESDHC_WP_NONE, /* no WP, neither signal nor gpio */
> + ESDHC_WP_SIGNAL, /* mmc internal WP signal */
I think SIGNAL is not descriptive enough. Maybe
ESDHC_WP_INTERNAL /* WP routed directly to mmc controller */
? It should be mentioned on which SoCs this is not available?
> + ESDHC_WP_GPIO, /* external gpio pin for WP */
> +};
> +
> +enum cd_types {
> + ESDHC_CD_NONE, /* no CD, neither signal nor gpio */
> + ESDHC_CD_SIGNAL, /* mmc internal CD signal */
ditto
> + ESDHC_CD_GPIO, /* external gpio pin for CD */
> + ESDHC_CD_PERMANENT, /* no CD, card permanently wired to host */
> +};
> +
> /**
> - * struct esdhc_platform_data - optional platform data for esdhc on i.MX
> - *
> - * strongly recommended for i.MX25/35, not needed for other variants
> + * struct esdhc_platform_data - platform data for esdhc on i.MX
> *
> - * @wp_gpio: gpio for write_protect (-EINVAL if unused)
> - * @cd_gpio: gpio for card_detect interrupt (-EINVAL if unused)
> + * @wp_gpio: gpio for write_protect
> + * @cd_gpio: gpio for card_detect interrupt
> + * @wp_type: type of write_protect method (see wp_types enum above)
> + * @cd_type: type of card_detect method (see cd_types enum above)
> */
>
> struct esdhc_platform_data {
> unsigned int wp_gpio;
> unsigned int cd_gpio;
> + enum wp_types wp_type;
> + enum cd_types cd_type;
> };
> #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 79b7a9a..9cba6eb 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
> @@ -70,19 +69,15 @@ 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
> @@ -97,12 +92,13 @@ 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);
>
> @@ -201,6 +197,18 @@ 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 (gpio_is_valid(boarddata->wp_gpio))
> + return gpio_get_value(boarddata->wp_gpio);
> + else
> + return !(readl(host->ioaddr + SDHCI_PRESENT_STATE) &
> + SDHCI_WRITE_PROTECT);
> +}
Aren't you missing the NONE case here? Plus, I don't like having a
get_ro-function for the SIGNAL case, because in that case it is
superfluous. Though, I am not feeling strong about this if it makes the
rest of the code messier.
> +
> static struct sdhci_ops sdhci_esdhc_ops = {
> .read_l = esdhc_readl_le,
> .read_w = esdhc_readw_le,
> @@ -212,6 +220,7 @@ static struct sdhci_ops sdhci_esdhc_ops = {
> .get_min_clock = esdhc_pltfm_get_min_clock,
> .get_max_blk_size = esdhc_pltfm_get_max_blk_size,
> .get_max_blk_count = esdhc_pltfm_get_max_blk_count,
> + .get_ro = esdhc_pltfm_get_ro,
> };
>
> static struct sdhci_pltfm_data sdhci_esdhc_imx_pdata = {
> @@ -221,17 +230,6 @@ 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;
> @@ -272,23 +270,33 @@ 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()) {
> - /* 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;
else-block needs braces
>
> + /* 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),
> @@ -296,10 +304,6 @@ static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
> 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);
> @@ -307,10 +311,19 @@ static int __devinit sdhci_esdhc_imx_probe(struct platform_device *pdev)
> dev_warn(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_SIGNAL:
> + /* 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);
> @@ -319,16 +332,20 @@ 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;
> }
> @@ -343,14 +360,12 @@ 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);
> --
> 1.7.4.1
>
> --
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Regards,
Wolfram
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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