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mmc: sdhci-sprd: Add HS400 enhanced strobe mode 

Add HS400 enhanced strobe mode support for Spreadtrum SD host controller.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Baolin Wang 2019-06-04 16:14:25 +08:00 committed by Ulf Hansson
parent 7486831d7d
commit 494c11e1a5
1 changed files with 32 additions and 0 deletions
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32
drivers/mmc/host/sdhci-sprd.c
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@ -41,6 +41,7 @@
/* SDHCI_HOST_CONTROL2 */
#define SDHCI_SPRD_CTRL_HS200 0x0005
#define SDHCI_SPRD_CTRL_HS400 0x0006
#define SDHCI_SPRD_CTRL_HS400ES 0x0007
/*
* According to the standard specification, BIT(3) of SDHCI_SOFTWARE_RESET is
@ -132,6 +133,15 @@ static inline void sdhci_sprd_sd_clk_off(struct sdhci_host *host)
sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
}
static inline void sdhci_sprd_sd_clk_on(struct sdhci_host *host)
{
u16 ctrl;
ctrl = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
ctrl |= SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, ctrl, SDHCI_CLOCK_CONTROL);
}
static inline void
sdhci_sprd_set_dll_invert(struct sdhci_host *host, u32 mask, bool en)
{
@ -325,6 +335,26 @@ static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
sdhci_request(mmc, mrq);
}
static void sdhci_sprd_hs400_enhanced_strobe(struct mmc_host *mmc,
struct mmc_ios *ios)
{
struct sdhci_host *host = mmc_priv(mmc);
u16 ctrl_2;
if (!ios->enhanced_strobe)
return;
sdhci_sprd_sd_clk_off(host);
/* Set HS400 enhanced strobe mode */
ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
ctrl_2 |= SDHCI_SPRD_CTRL_HS400ES;
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
sdhci_sprd_sd_clk_on(host);
}
static const struct sdhci_pltfm_data sdhci_sprd_pdata = {
.quirks = SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK,
.quirks2 = SDHCI_QUIRK2_BROKEN_HS200 |
@ -346,6 +376,8 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
host->dma_mask = DMA_BIT_MASK(64);
pdev->dev.dma_mask = &host->dma_mask;
host->mmc_host_ops.request = sdhci_sprd_request;
host->mmc_host_ops.hs400_enhanced_strobe =
sdhci_sprd_hs400_enhanced_strobe;
host->mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
MMC_CAP_ERASE | MMC_CAP_CMD23;