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Subject[PATCH v2 5/9] mmc: sdhci-sprd: Add HS400 enhanced strobe mode
Date
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;
--
1.7.9.5
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