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| author |   Baolin Wang <baolin.wang@linaro.org> | 2019-06-04 16:14:25 +0800 |
|---|---|---|
| committer |   Ulf Hansson <ulf.hansson@linaro.org> | 2019-06-10 17:11:09 +0200 |
| commit | 494c11e1a5366d3f5adb2cb2b677b5b0bcf08e3b (patch) | |
| tree | d86791297f17e6a04cfe7502be8c3abfaa2da1f7 /drivers/mmc | |
| parent | mmc: sdhci-sprd: Implement the get_max_timeout_count() interface (diff) | |
| download | linux-dev-494c11e1a5366d3f5adb2cb2b677b5b0bcf08e3b.tar.xz linux-dev-494c11e1a5366d3f5adb2cb2b677b5b0bcf08e3b.zip | |
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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-sprd.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c index d91281d02cdb..edec19755ecd 100644 --- a/drivers/mmc/host/sdhci-sprd.c +++ b/drivers/mmc/host/sdhci-sprd.c @@ -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; |