| Message ID | 20349e8ebd4c1ec64fb5f8cdd9e094d0c1732855.1558346019.git.baolin.wang@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add SD host controller support for SC9860 platform | expand |
On 20/05/19 1:11 PM, Baolin Wang wrote: > 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> > --- > drivers/mmc/host/sdhci-sprd.c | 32 ++++++++++++++++++++++++++++++++ > 1 file changed, 32 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c > index d91281d..edec197 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; >
diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c index d91281d..edec197 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;
Add HS400 enhanced strobe mode support for Spreadtrum SD host controller. Signed-off-by: Baolin Wang <baolin.wang@linaro.org> --- drivers/mmc/host/sdhci-sprd.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)