[PATCH v2 12/16] mmc: meson-gx: implement card_busy callback
From: jbrunet@baylibre.com (Jerome Brunet)
Date: 2017-08-21 16:04:07
Also in:
linux-amlogic, linux-mmc, lkml
Subsystem:
arm/amlogic meson soc support, multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Neil Armstrong, Kevin Hilman, Ulf Hansson, Linus Torvalds
The card_busy callback is important to then add the voltage switch callback as it allow to verify that the card is done dealing with the voltage switch Reviewed-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- drivers/mmc/host/meson-gx-mmc.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 5203a9f76fe3..441ebf2b0146 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c@@ -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)
@@ -903,6 +904,17 @@ 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,
@@ -910,6 +922,7 @@ 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)
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2.9.5