mmc: tmio: Add UHS-I mode support

Based on work by Shinobu Uehara and Ben Dooks. This adds the voltage
switch operation needed for all UHS-I modes, but not the tuning needed
for SDR-104 which will come later.

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index b44b589..b1819c7 100644 (file)
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -101,6 +101,8 @@ struct tmio_mmc_host {
        void (*clk_disable)(struct tmio_mmc_host *host);
        int (*multi_io_quirk)(struct mmc_card *card,
                              unsigned int direction, int blk_size);
+       int (*start_signal_voltage_switch)(struct mmc_host *mmc,
+                                          struct mmc_ios *ios);
 };
 
 struct tmio_mmc_host *tmio_mmc_host_alloc(struct platform_device *pdev);

diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index ecc16a3..6727198 100644 (file)
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -1012,12 +1012,20 @@ static int tmio_multi_io_quirk(struct mmc_card *card,
        return blk_size;
 }
 
-static const struct mmc_host_ops tmio_mmc_ops = {
+static int tmio_mmc_card_busy(struct mmc_host *mmc)
+{
+       struct tmio_mmc_host *host = mmc_priv(mmc);
+
+       return !(sd_ctrl_read32(host, CTL_STATUS2) & TMIO_STATUS2_DAT0);
+}
+
+static struct mmc_host_ops tmio_mmc_ops = {
        .request        = tmio_mmc_request,
        .set_ios        = tmio_mmc_set_ios,
        .get_ro         = tmio_mmc_get_ro,
        .get_cd         = mmc_gpio_get_cd,
        .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
+       .card_busy      = tmio_mmc_card_busy,
        .multi_io_quirk = tmio_multi_io_quirk,
 };
 
@@ -1116,7 +1124,9 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host,
                goto host_free;
        }
 
+       tmio_mmc_ops.start_signal_voltage_switch = _host->start_signal_voltage_switch;
        mmc->ops = &tmio_mmc_ops;
+
        mmc->caps |= MMC_CAP_4_BIT_DATA | pdata->capabilities;
        mmc->caps2 |= pdata->capabilities2;
        mmc->max_segs = 32;

diff --git a/include/linux/mmc/tmio.h b/include/linux/mmc/tmio.h
index 5f5cd80..b2f28e9 100644 (file)
--- a/include/linux/mmc/tmio.h
+++ b/include/linux/mmc/tmio.h
@@ -63,6 +63,8 @@
 #define TMIO_STAT_CMD_BUSY      0x40000000
 #define TMIO_STAT_ILL_ACCESS    0x80000000
 
+#define TMIO_STATUS2_DAT0      BIT(7)
+
 #define        CLK_CTL_DIV_MASK        0xff
 #define        CLK_CTL_SCLKEN          BIT(8)