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mmc: sdhci-omap: Add special reset capability 

Some omap controllers need software to monitor a 0->1->0 for software
reset. Add a SDHCI_OMAP_SPECIAL_RESET flag to indicate this.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20200116105154.7685-11-faiz_abbas@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Faiz Abbas 2020-01-16 16:21:54 +05:30 committed by Ulf Hansson
parent d6fe49286e
commit 9e84a2e688
1 changed files with 23 additions and 0 deletions
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23
drivers/mmc/host/sdhci-omap.c
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@ -86,6 +86,7 @@
/* sdhci-omap controller flags */
#define SDHCI_OMAP_REQUIRE_IODELAY BIT(0)
#define SDHCI_OMAP_SPECIAL_RESET BIT(1)
struct sdhci_omap_data {
u32 offset;
@ -779,15 +780,35 @@ static void sdhci_omap_set_uhs_signaling(struct sdhci_host *host,
sdhci_omap_start_clock(omap_host);
}
#define MMC_TIMEOUT_US 20000 /* 20000 micro Sec */
static void sdhci_omap_reset(struct sdhci_host *host, u8 mask)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
unsigned long limit = MMC_TIMEOUT_US;
unsigned long i = 0;
/* Don't reset data lines during tuning operation */
if (omap_host->is_tuning)
mask &= ~SDHCI_RESET_DATA;
if (omap_host->flags & SDHCI_OMAP_SPECIAL_RESET) {
sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
while ((!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask)) &&
(i++ < limit))
udelay(1);
i = 0;
while ((sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask) &&
(i++ < limit))
udelay(1);
if (sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask)
dev_err(mmc_dev(host->mmc),
"Timeout waiting on controller reset in %s\n",
__func__);
return;
}
sdhci_reset(host, mask);
}
@ -900,10 +921,12 @@ static const struct sdhci_omap_data k2g_data = {
static const struct sdhci_omap_data am335_data = {
.offset = 0x200,
.flags = SDHCI_OMAP_SPECIAL_RESET,
};
static const struct sdhci_omap_data am437_data = {
.offset = 0x200,
.flags = SDHCI_OMAP_SPECIAL_RESET,
};
static const struct sdhci_omap_data dra7_data = {