diff options
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-esdhc-imx.c | 86 |
1 files changed, 83 insertions, 3 deletions
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c index c6b9f64..b8b7e88 100644 --- a/drivers/mmc/host/sdhci-esdhc-imx.c +++ b/drivers/mmc/host/sdhci-esdhc-imx.c @@ -44,6 +44,7 @@ #define ESDHC_MIX_CTRL_EXE_TUNE (1 << 22) #define ESDHC_MIX_CTRL_SMPCLK_SEL (1 << 23) #define ESDHC_MIX_CTRL_FBCLK_SEL (1 << 25) +#define ESDHC_MIX_CTRL_HS400_EN (1 << 26) /* Bits 3 and 6 are not SDHCI standard definitions */ #define ESDHC_MIX_CTRL_SDHCI_MASK 0xb7 /* Tuning bits */ @@ -60,6 +61,16 @@ #define ESDHC_TUNE_CTRL_MIN 0 #define ESDHC_TUNE_CTRL_MAX ((1 << 7) - 1) +/* strobe dll register */ +#define ESDHC_STROBE_DLL_CTRL 0x70 +#define ESDHC_STROBE_DLL_CTRL_ENABLE (1 << 0) +#define ESDHC_STROBE_DLL_CTRL_RESET (1 << 1) +#define ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT 3 + +#define ESDHC_STROBE_DLL_STATUS 0x74 +#define ESDHC_STROBE_DLL_STS_REF_LOCK (1 << 1) +#define ESDHC_STROBE_DLL_STS_SLV_LOCK 0x1 + #define ESDHC_TUNING_CTRL 0xcc #define ESDHC_STD_TUNING_EN (1 << 24) /* NOTE: the minimum valid tuning start tap for mx6sl is 1 */ @@ -120,6 +131,11 @@ #define ESDHC_FLAG_ERR004536 BIT(7) /* The IP supports HS200 mode */ #define ESDHC_FLAG_HS200 BIT(8) +/* The IP supports HS400 mode */ +#define ESDHC_FLAG_HS400 BIT(9) + +/* A higher clock ferquency than this rate requires strobell dll control */ +#define ESDHC_STROBE_DLL_CLK_FREQ 100000000 struct esdhc_soc_data { u32 flags; @@ -156,6 +172,12 @@ static struct esdhc_soc_data usdhc_imx6sx_data = { | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200, }; +static struct esdhc_soc_data usdhc_imx7d_data = { + .flags = ESDHC_FLAG_USDHC | ESDHC_FLAG_STD_TUNING + | ESDHC_FLAG_HAVE_CAP1 | ESDHC_FLAG_HS200 + | ESDHC_FLAG_HS400, +}; + struct pltfm_imx_data { u32 scratchpad; struct pinctrl *pinctrl; @@ -199,6 +221,7 @@ static const struct of_device_id imx_esdhc_dt_ids[] = { { .compatible = "fsl,imx6sx-usdhc", .data = &usdhc_imx6sx_data, }, { .compatible = "fsl,imx6sl-usdhc", .data = &usdhc_imx6sl_data, }, { .compatible = "fsl,imx6q-usdhc", .data = &usdhc_imx6q_data, }, + { .compatible = "fsl,imx7d-usdhc", .data = &usdhc_imx7d_data, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, imx_esdhc_dt_ids); @@ -274,6 +297,9 @@ static u32 esdhc_readl_le(struct sdhci_host *host, int reg) val = SDHCI_SUPPORT_DDR50 | SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | SDHCI_USE_SDR50_TUNING; + + if (imx_data->socdata->flags & ESDHC_FLAG_HS400) + val |= SDHCI_SUPPORT_HS400; } } @@ -774,6 +800,7 @@ static int esdhc_change_pinstate(struct sdhci_host *host, break; case MMC_TIMING_UHS_SDR104: case MMC_TIMING_MMC_HS200: + case MMC_TIMING_MMC_HS400: pinctrl = imx_data->pins_200mhz; break; default: @@ -784,24 +811,68 @@ static int esdhc_change_pinstate(struct sdhci_host *host, return pinctrl_select_state(imx_data->pinctrl, pinctrl); } +/* + * For HS400 eMMC, there is a data_strobe line, this signal is generated + * by the device and used for data output and CRC status response output + * in HS400 mode. The frequency of this signal follows the frequency of + * CLK generated by host. Host receive the data which is aligned to the + * edge of data_strobe line. Due to the time delay between CLK line and + * data_strobe line, if the delay time is larger than one clock cycle, + * then CLK and data_strobe line will misaligned, read error shows up. + * So when the CLK is higher than 100MHz, each clock cycle is short enough, + * host should config the delay target. + */ +static void esdhc_set_strobe_dll(struct sdhci_host *host) +{ + u32 v; + + if (host->mmc->actual_clock > ESDHC_STROBE_DLL_CLK_FREQ) { + /* force a reset on strobe dll */ + writel(ESDHC_STROBE_DLL_CTRL_RESET, + host->ioaddr + ESDHC_STROBE_DLL_CTRL); + /* + * enable strobe dll ctrl and adjust the delay target + * for the uSDHC loopback read clock + */ + v = ESDHC_STROBE_DLL_CTRL_ENABLE | + (7 << ESDHC_STROBE_DLL_CTRL_SLV_DLY_TARGET_SHIFT); + writel(v, host->ioaddr + ESDHC_STROBE_DLL_CTRL); + /* wait 1us to make sure strobe dll status register stable */ + udelay(1); + v = readl(host->ioaddr + ESDHC_STROBE_DLL_STATUS); + if (!(v & ESDHC_STROBE_DLL_STS_REF_LOCK)) + dev_warn(mmc_dev(host->mmc), + "warning! HS400 strobe DLL status REF not lock!\n"); + if (!(v & ESDHC_STROBE_DLL_STS_SLV_LOCK)) + dev_warn(mmc_dev(host->mmc), + "warning! HS400 strobe DLL status SLV not lock!\n"); + } +} + static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing) { + u32 m; struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct pltfm_imx_data *imx_data = pltfm_host->priv; struct esdhc_platform_data *boarddata = &imx_data->boarddata; + /* disable ddr mode and disable HS400 mode */ + m = readl(host->ioaddr + ESDHC_MIX_CTRL); + m &= ~(ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN); + imx_data->is_ddr = 0; + switch (timing) { case MMC_TIMING_UHS_SDR12: case MMC_TIMING_UHS_SDR25: case MMC_TIMING_UHS_SDR50: case MMC_TIMING_UHS_SDR104: case MMC_TIMING_MMC_HS200: + writel(m, host->ioaddr + ESDHC_MIX_CTRL); break; case MMC_TIMING_UHS_DDR50: case MMC_TIMING_MMC_DDR52: - writel(readl(host->ioaddr + ESDHC_MIX_CTRL) | - ESDHC_MIX_CTRL_DDREN, - host->ioaddr + ESDHC_MIX_CTRL); + m |= ESDHC_MIX_CTRL_DDREN; + writel(m, host->ioaddr + ESDHC_MIX_CTRL); imx_data->is_ddr = 1; if (boarddata->delay_line) { u32 v; @@ -813,6 +884,12 @@ static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing) writel(v, host->ioaddr + ESDHC_DLL_CTRL); } break; + case MMC_TIMING_MMC_HS400: + m |= ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN; + writel(m, host->ioaddr + ESDHC_MIX_CTRL); + imx_data->is_ddr = 1; + esdhc_set_strobe_dll(host); + break; } esdhc_change_pinstate(host, timing); @@ -1100,6 +1177,9 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev) if (imx_data->socdata->flags & ESDHC_FLAG_ERR004536) host->quirks |= SDHCI_QUIRK_BROKEN_ADMA; + if (imx_data->socdata->flags & ESDHC_FLAG_HS400) + host->quirks2 |= SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400; + if (of_id) err = sdhci_esdhc_imx_probe_dt(pdev, host, imx_data); else |