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mmc: meson-gx: implement card_busy callback 

Implement the card_busy callback to be able to verify that the
card is done dealing with voltage switch, when the support is
added later on.

Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jerome Brunet 2017-08-28 16:29:11 +02:00 committed by Ulf Hansson
parent 74858655cb
commit 186cd8b7f5
1 changed files with 13 additions and 0 deletions
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13
drivers/mmc/host/meson-gx-mmc.c
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@ -76,6 +76,7 @@
#define SD_EMMC_STATUS 0x48
#define STATUS_BUSY BIT(31)
#define STATUS_DATI GENMASK(23, 16)
#define SD_EMMC_IRQ_EN 0x4c
#define IRQ_RXD_ERR_MASK GENMASK(7, 0)
@ -902,6 +903,17 @@ static void meson_mmc_cfg_init(struct meson_host *host)
writel(cfg, host->regs + SD_EMMC_CFG);
}
static int meson_mmc_card_busy(struct mmc_host *mmc)
{
struct meson_host *host = mmc_priv(mmc);
u32 regval;
regval = readl(host->regs + SD_EMMC_STATUS);
/* We are only interrested in lines 0 to 3, so mask the other ones */
return !(FIELD_GET(STATUS_DATI, regval) & 0xf);
}
static const struct mmc_host_ops meson_mmc_ops = {
.request = meson_mmc_request,
.set_ios = meson_mmc_set_ios,
@ -909,6 +921,7 @@ static const struct mmc_host_ops meson_mmc_ops = {
.pre_req = meson_mmc_pre_req,
.post_req = meson_mmc_post_req,
.execute_tuning = meson_mmc_execute_tuning,
.card_busy = meson_mmc_card_busy,
};
static int meson_mmc_probe(struct platform_device *pdev)