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mmc: tmio: Add UHS-I mode support

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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>
This commit is contained in:
Wolfram Sang 2016-04-01 17:44:33 +02:00 committed by Ulf Hansson
parent 2fb55956ce
commit 452e5eef6d
3 changed files with 15 additions and 1 deletions
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2
drivers/mmc/host/tmio_mmc.h
View file

@ -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);

12
drivers/mmc/host/tmio_mmc_pio.c
View file

@ -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;

2
include/linux/mmc/tmio.h
View file

@ -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)