mmc: sdhci-st: Add sdhci_st_set_uhs_signaling function.

To allow UHS modes to work properly we need to provide the st specific
set_uhs_signaling callback function. This function differs from the
generic sdhci_set_uhs_signaling callback in that we need to configure
the correct delay depending on the UHS mode, and also set the V18_EN
bit.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 51 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci-st.c b/drivers/mmc/host/sdhci-st.c
index 10989edb5100..42a361c14f52 100644
--- a/drivers/mmc/host/sdhci-st.c
+++ b/drivers/mmc/host/sdhci-st.c
@@ -261,6 +261,56 @@ static int sdhci_st_set_dll_for_clock(struct sdhci_host *host)
         return ret;
 }
 
+static void sdhci_st_set_uhs_signaling(struct sdhci_host *host,
+                                        unsigned int uhs)
+{
+        struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+        struct st_mmc_platform_data *pdata = pltfm_host->priv;
+        u16 ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+        int ret = 0;
+
+        /* Select Bus Speed Mode for host */
+        ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
+        switch (uhs) {
+        /*
+         * Set V18_EN -- UHS modes do not work without this.
+         * does not change signaling voltage
+         */
+
+        case MMC_TIMING_UHS_SDR12:
+                st_mmcss_set_static_delay(pdata->top_ioaddr);
+                ctrl_2 |= SDHCI_CTRL_UHS_SDR12 | SDHCI_CTRL_VDD_180;
+                break;
+        case MMC_TIMING_UHS_SDR25:
+                st_mmcss_set_static_delay(pdata->top_ioaddr);
+                ctrl_2 |= SDHCI_CTRL_UHS_SDR25 | SDHCI_CTRL_VDD_180;
+                break;
+        case MMC_TIMING_UHS_SDR50:
+                st_mmcss_set_static_delay(pdata->top_ioaddr);
+                ctrl_2 |= SDHCI_CTRL_UHS_SDR50 | SDHCI_CTRL_VDD_180;
+                ret = sdhci_st_set_dll_for_clock(host);
+                break;
+        case MMC_TIMING_UHS_SDR104:
+        case MMC_TIMING_MMC_HS200:
+                st_mmcss_set_static_delay(pdata->top_ioaddr);
+                ctrl_2 |= SDHCI_CTRL_UHS_SDR104 | SDHCI_CTRL_VDD_180;
+                ret =  sdhci_st_set_dll_for_clock(host);
+                break;
+        case MMC_TIMING_UHS_DDR50:
+        case MMC_TIMING_MMC_DDR52:
+                st_mmcss_set_static_delay(pdata->top_ioaddr);
+                ctrl_2 |= SDHCI_CTRL_UHS_DDR50 | SDHCI_CTRL_VDD_180;
+                break;
+        }
+
+        if (ret)
+                dev_warn(mmc_dev(host->mmc), "Error setting dll for clock "
+                                                "(uhs %d)\n", uhs);
+
+        dev_dbg(mmc_dev(host->mmc), "uhs %d, ctrl_2 %04X\n", uhs, ctrl_2);
+
+        sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
+}
 
 static u32 sdhci_st_readl(struct sdhci_host *host, int reg)
 {
@@ -284,6 +334,7 @@ static const struct sdhci_ops sdhci_st_ops = {
         .set_bus_width = sdhci_set_bus_width,
         .read_l = sdhci_st_readl,
         .reset = sdhci_reset,
+        .set_uhs_signaling = sdhci_st_set_uhs_signaling,
 };
 
 static const struct sdhci_pltfm_data sdhci_st_pdata = {