diff --git a/drivers/mmc/zynq_sdhci.c b/drivers/mmc/zynq_sdhci.c index 998a384506..e69f375cce 100644 --- a/drivers/mmc/zynq_sdhci.c +++ b/drivers/mmc/zynq_sdhci.c @@ -20,6 +20,12 @@ #include #define SDHCI_TUNING_LOOP_COUNT 40 +#define MMC_BANK2 0x2 + +struct arasan_sdhci_clk_data { + int clk_phase_in[MMC_TIMING_MMC_HS400 + 1]; + int clk_phase_out[MMC_TIMING_MMC_HS400 + 1]; +}; struct arasan_sdhci_plat { struct mmc_config cfg; @@ -28,12 +34,17 @@ struct arasan_sdhci_plat { struct arasan_sdhci_priv { struct sdhci_host *host; + struct arasan_sdhci_clk_data clk_data; u8 deviceid; u8 bank; u8 no_1p8; }; #if defined(CONFIG_ARCH_ZYNQMP) +/* Default settings for ZynqMP Clock Phases */ +const u32 zynqmp_iclk_phases[] = {0, 63, 63, 0, 63, 0, 0, 183, 54, 0, 0}; +const u32 zynqmp_oclk_phases[] = {0, 72, 60, 0, 60, 72, 135, 48, 72, 135, 0}; + static const u8 mode2timing[] = { [MMC_LEGACY] = MMC_TIMING_LEGACY, [MMC_HS] = MMC_TIMING_MMC_HS, @@ -168,6 +179,79 @@ static void arasan_sdhci_set_tapdelay(struct sdhci_host *host) priv->bank); } +static void arasan_dt_read_clk_phase(struct udevice *dev, unsigned char timing, + const char *prop) +{ + struct arasan_sdhci_priv *priv = dev_get_priv(dev); + struct arasan_sdhci_clk_data *clk_data = &priv->clk_data; + u32 clk_phase[2] = {0}; + + /* + * Read Tap Delay values from DT, if the DT does not contain the + * Tap Values then use the pre-defined values + */ + if (dev_read_u32_array(dev, prop, &clk_phase[0], 2)) { + dev_dbg(dev, "Using predefined clock phase for %s = %d %d\n", + prop, clk_data->clk_phase_in[timing], + clk_data->clk_phase_out[timing]); + return; + } + + /* The values read are Input and Output Clock Delays in order */ + clk_data->clk_phase_in[timing] = clk_phase[0]; + clk_data->clk_phase_out[timing] = clk_phase[1]; +} + +/** + * arasan_dt_parse_clk_phases - Read Tap Delay values from DT + * + * Called at initialization to parse the values of Tap Delays. + * + * @dev: Pointer to our struct udevice. + */ +static void arasan_dt_parse_clk_phases(struct udevice *dev) +{ + struct arasan_sdhci_priv *priv = dev_get_priv(dev); + struct arasan_sdhci_clk_data *clk_data = &priv->clk_data; + int i; + + if (IS_ENABLED(CONFIG_ARCH_ZYNQMP) && + device_is_compatible(dev, "xlnx,zynqmp-8.9a")) { + for (i = 0; i <= MMC_TIMING_MMC_HS400; i++) { + clk_data->clk_phase_in[i] = zynqmp_iclk_phases[i]; + clk_data->clk_phase_out[i] = zynqmp_oclk_phases[i]; + } + + if (priv->bank == MMC_BANK2) { + clk_data->clk_phase_out[MMC_TIMING_UHS_SDR104] = 90; + clk_data->clk_phase_out[MMC_TIMING_MMC_HS200] = 90; + } + } + + arasan_dt_read_clk_phase(dev, MMC_TIMING_LEGACY, + "clk-phase-legacy"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_MMC_HS, + "clk-phase-mmc-hs"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_SD_HS, + "clk-phase-sd-hs"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_UHS_SDR12, + "clk-phase-uhs-sdr12"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_UHS_SDR25, + "clk-phase-uhs-sdr25"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_UHS_SDR50, + "clk-phase-uhs-sdr50"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_UHS_SDR104, + "clk-phase-uhs-sdr104"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_UHS_DDR50, + "clk-phase-uhs-ddr50"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_MMC_DDR52, + "clk-phase-mmc-ddr52"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_MMC_HS200, + "clk-phase-mmc-hs200"); + arasan_dt_read_clk_phase(dev, MMC_TIMING_MMC_HS400, + "clk-phase-mmc-hs400"); +} + static void arasan_sdhci_set_control_reg(struct sdhci_host *host) { struct mmc *mmc = (struct mmc *)host->mmc; @@ -271,6 +355,7 @@ static int arasan_sdhci_ofdata_to_platdata(struct udevice *dev) #if defined(CONFIG_ARCH_ZYNQMP) priv->host->ops = &arasan_ops; + arasan_dt_parse_clk_phases(dev); #endif priv->host->ioaddr = (void *)dev_read_addr(dev);