| Message ID | 20231114-th1520-mmc-v6-3-3273c661a571@baylibre.com |
|---|---|
| State | New |
| Headers | show |
| Series | RISC-V: Add MMC support for TH1520 boards | expand |
On Tue, Nov 14, 2023 at 04:07:57PM -0500, Drew Fustini wrote: > Add support for the mmc controller in the T-Head TH1520 with the new > compatible "thead,th1520-dwcmshc". Implement custom sdhci_ops for > set_uhs_signaling, reset, voltage_switch, and platform_execute_tuning. > > Acked-by: Adrian Hunter <adrian.hunter@intel.com> > Signed-off-by: Drew Fustini <dfustini@baylibre.com> Reviewed-by: Jisheng Zhang <jszhang@kernel.org> Thank Drew! PS: one FYI below. > --- > drivers/mmc/host/sdhci-of-dwcmshc.c | 349 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 349 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c > index 3a3bae6948a8..0eb72544c09e 100644 > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c > @@ -8,6 +8,7 @@ > */ > > #include <linux/acpi.h> > +#include <linux/bitfield.h> > #include <linux/clk.h> > #include <linux/dma-mapping.h> > #include <linux/iopoll.h> > @@ -35,6 +36,21 @@ > #define DWCMSHC_CARD_IS_EMMC BIT(0) > #define DWCMSHC_ENHANCED_STROBE BIT(8) > #define DWCMSHC_EMMC_ATCTRL 0x40 > +/* Tuning and auto-tuning fields in AT_CTRL_R control register */ > +#define AT_CTRL_AT_EN BIT(0) /* autotuning is enabled */ > +#define AT_CTRL_CI_SEL BIT(1) /* interval to drive center phase select */ > +#define AT_CTRL_SWIN_TH_EN BIT(2) /* sampling window threshold enable */ > +#define AT_CTRL_RPT_TUNE_ERR BIT(3) /* enable reporting framing errors */ > +#define AT_CTRL_SW_TUNE_EN BIT(4) /* enable software managed tuning */ > +#define AT_CTRL_WIN_EDGE_SEL_MASK GENMASK(11, 8) /* bits [11:8] */ > +#define AT_CTRL_WIN_EDGE_SEL 0xf /* sampling window edge select */ > +#define AT_CTRL_TUNE_CLK_STOP_EN BIT(16) /* clocks stopped during phase code change */ > +#define AT_CTRL_PRE_CHANGE_DLY_MASK GENMASK(18, 17) /* bits [18:17] */ > +#define AT_CTRL_PRE_CHANGE_DLY 0x1 /* 2-cycle latency */ > +#define AT_CTRL_POST_CHANGE_DLY_MASK GENMASK(20, 19) /* bits [20:19] */ > +#define AT_CTRL_POST_CHANGE_DLY 0x3 /* 4-cycle latency */ > +#define AT_CTRL_SWIN_TH_VAL_MASK GENMASK(31, 24) /* bits [31:24] */ > +#define AT_CTRL_SWIN_TH_VAL 0x9 /* sampling window threshold */ > > /* Rockchip specific Registers */ > #define DWCMSHC_EMMC_DLL_CTRL 0x800 > @@ -72,6 +88,82 @@ > (((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0)) > #define RK35xx_MAX_CLKS 3 > > +/* PHY register area pointer */ > +#define DWC_MSHC_PTR_PHY_R 0x300 > + > +/* PHY general configuration */ > +#define PHY_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x00) > +#define PHY_CNFG_RSTN_DEASSERT 0x1 /* Deassert PHY reset */ > +#define PHY_CNFG_PAD_SP_MASK GENMASK(19, 16) /* bits [19:16] */ > +#define PHY_CNFG_PAD_SP 0x0c /* PMOS TX drive strength */ > +#define PHY_CNFG_PAD_SN_MASK GENMASK(23, 20) /* bits [23:20] */ > +#define PHY_CNFG_PAD_SN 0x0c /* NMOS TX drive strength */ > + > +/* PHY command/response pad settings */ > +#define PHY_CMDPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x04) > + > +/* PHY data pad settings */ > +#define PHY_DATAPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x06) > + > +/* PHY clock pad settings */ > +#define PHY_CLKPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x08) > + > +/* PHY strobe pad settings */ > +#define PHY_STBPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x0a) > + > +/* PHY reset pad settings */ > +#define PHY_RSTNPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x0c) > + > +/* Bitfields are common for all pad settings */ > +#define PHY_PAD_RXSEL_1V8 0x1 /* Receiver type select for 1.8V */ > +#define PHY_PAD_RXSEL_3V3 0x2 /* Receiver type select for 3.3V */ > + > +#define PHY_PAD_WEAKPULL_MASK GENMASK(4, 3) /* bits [4:3] */ > +#define PHY_PAD_WEAKPULL_PULLUP 0x1 /* Weak pull up enabled */ > +#define PHY_PAD_WEAKPULL_PULLDOWN 0x2 /* Weak pull down enabled */ > + > +#define PHY_PAD_TXSLEW_CTRL_P_MASK GENMASK(8, 5) /* bits [8:5] */ > +#define PHY_PAD_TXSLEW_CTRL_P 0x3 /* Slew control for P-Type pad TX */ > +#define PHY_PAD_TXSLEW_CTRL_N_MASK GENMASK(12, 9) /* bits [12:9] */ > +#define PHY_PAD_TXSLEW_CTRL_N 0x3 /* Slew control for N-Type pad TX */ > + > +/* PHY CLK delay line settings */ > +#define PHY_SDCLKDL_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x1d) > +#define PHY_SDCLKDL_CNFG_UPDATE BIT(4) /* set before writing to SDCLKDL_DC */ > + > +/* PHY CLK delay line delay code */ > +#define PHY_SDCLKDL_DC_R (DWC_MSHC_PTR_PHY_R + 0x1e) > +#define PHY_SDCLKDL_DC_INITIAL 0x40 /* initial delay code */ > +#define PHY_SDCLKDL_DC_DEFAULT 0x32 /* default delay code */ > +#define PHY_SDCLKDL_DC_HS400 0x18 /* delay code for HS400 mode */ > + > +/* PHY drift_cclk_rx delay line configuration setting */ > +#define PHY_ATDL_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x21) > +#define PHY_ATDL_CNFG_INPSEL_MASK GENMASK(3, 2) /* bits [3:2] */ > +#define PHY_ATDL_CNFG_INPSEL 0x3 /* delay line input source */ > + > +/* PHY DLL control settings */ > +#define PHY_DLL_CTRL_R (DWC_MSHC_PTR_PHY_R + 0x24) > +#define PHY_DLL_CTRL_DISABLE 0x0 /* PHY DLL is enabled */ > +#define PHY_DLL_CTRL_ENABLE 0x1 /* PHY DLL is disabled */ > + > +/* PHY DLL configuration register 1 */ > +#define PHY_DLL_CNFG1_R (DWC_MSHC_PTR_PHY_R + 0x25) > +#define PHY_DLL_CNFG1_SLVDLY_MASK GENMASK(5, 4) /* bits [5:4] */ > +#define PHY_DLL_CNFG1_SLVDLY 0x2 /* DLL slave update delay input */ > +#define PHY_DLL_CNFG1_WAITCYCLE 0x5 /* DLL wait cycle input */ > + > +/* PHY DLL configuration register 2 */ > +#define PHY_DLL_CNFG2_R (DWC_MSHC_PTR_PHY_R + 0x26) > +#define PHY_DLL_CNFG2_JUMPSTEP 0xa /* DLL jump step input */ > + > +/* PHY DLL master and slave delay line configuration settings */ > +#define PHY_DLLDL_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x28) > +#define PHY_DLLDL_CNFG_SLV_INPSEL_MASK GENMASK(6, 5) /* bits [6:5] */ > +#define PHY_DLLDL_CNFG_SLV_INPSEL 0x3 /* clock source select for slave DL */ > + > +#define FLAG_IO_FIXED_1V8 BIT(0) > + > #define BOUNDARY_OK(addr, len) \ > ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) > > @@ -92,6 +184,8 @@ struct dwcmshc_priv { > struct clk *bus_clk; > int vendor_specific_area1; /* P_VENDOR_SPECIFIC_AREA reg */ > void *priv; /* pointer to SoC private stuff */ > + u16 delay_line; > + u16 flags; > }; > > /* > @@ -157,6 +251,127 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq) > sdhci_request(mmc, mrq); > } > > +static void dwcmshc_phy_1_8v_init(struct sdhci_host *host) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); > + u32 val; > + > + /* deassert phy reset & set tx drive strength */ > + val = PHY_CNFG_RSTN_DEASSERT; > + val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP); > + val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN); > + sdhci_writel(host, val, PHY_CNFG_R); > + > + /* disable delay line */ > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R); > + > + /* set delay line */ > + sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R); > + sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R); > + > + /* enable delay lane */ > + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); > + val &= ~(PHY_SDCLKDL_CNFG_UPDATE); > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > + > + /* configure phy pads */ > + val = PHY_PAD_RXSEL_1V8; > + val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); > + sdhci_writew(host, val, PHY_CMDPAD_CNFG_R); > + sdhci_writew(host, val, PHY_DATAPAD_CNFG_R); > + sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R); > + > + val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); > + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); > + > + val = PHY_PAD_RXSEL_1V8; > + val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); > + sdhci_writew(host, val, PHY_STBPAD_CNFG_R); > + > + /* enable data strobe mode */ > + sdhci_writeb(host, FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL), > + PHY_DLLDL_CNFG_R); > + > + /* enable phy dll */ > + sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); > +} > + > +static void dwcmshc_phy_3_3v_init(struct sdhci_host *host) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); > + u32 val; > + > + /* deassert phy reset & set tx drive strength */ > + val = PHY_CNFG_RSTN_DEASSERT; > + val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP); > + val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN); > + sdhci_writel(host, val, PHY_CNFG_R); > + > + /* disable delay line */ > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R); > + > + /* set delay line */ > + sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R); > + sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R); > + > + /* enable delay lane */ > + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); > + val &= ~(PHY_SDCLKDL_CNFG_UPDATE); > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > + > + /* configure phy pads */ > + val = PHY_PAD_RXSEL_3V3; > + val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); > + sdhci_writew(host, val, PHY_CMDPAD_CNFG_R); > + sdhci_writew(host, val, PHY_DATAPAD_CNFG_R); > + sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R); > + > + val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); > + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); > + > + val = PHY_PAD_RXSEL_3V3; > + val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); > + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); > + sdhci_writew(host, val, PHY_STBPAD_CNFG_R); > + > + /* enable phy dll */ > + sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); > +} > + > +static void th1520_sdhci_set_phy(struct sdhci_host *host) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); > + u32 emmc_caps = MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO; > + u16 emmc_ctrl; > + > + /* Before power on, set PHY configs */ > + if (priv->flags & FLAG_IO_FIXED_1V8) > + dwcmshc_phy_1_8v_init(host); > + else > + dwcmshc_phy_3_3v_init(host); > + > + if ((host->mmc->caps2 & emmc_caps) == emmc_caps) { > + emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); > + emmc_ctrl |= DWCMSHC_CARD_IS_EMMC; > + sdhci_writew(host, emmc_ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); > + } > + > + sdhci_writeb(host, FIELD_PREP(PHY_DLL_CNFG1_SLVDLY_MASK, PHY_DLL_CNFG1_SLVDLY) | > + PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R); > +} > + > static void dwcmshc_set_uhs_signaling(struct sdhci_host *host, > unsigned int timing) > { > @@ -189,9 +404,25 @@ static void dwcmshc_set_uhs_signaling(struct sdhci_host *host, > ctrl_2 |= DWCMSHC_CTRL_HS400; > } > > + if (priv->flags & FLAG_IO_FIXED_1V8) > + ctrl_2 |= SDHCI_CTRL_VDD_180; > sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); > } > > +static void th1520_set_uhs_signaling(struct sdhci_host *host, > + unsigned int timing) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); > + > + dwcmshc_set_uhs_signaling(host, timing); > + if (timing == MMC_TIMING_MMC_HS400) > + priv->delay_line = PHY_SDCLKDL_DC_HS400; > + else > + sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R); > + th1520_sdhci_set_phy(host); > +} > + > static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc, > struct mmc_ios *ios) > { > @@ -338,6 +569,79 @@ static void rk35xx_sdhci_reset(struct sdhci_host *host, u8 mask) > sdhci_reset(host, mask); > } > > +static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode) I believe prefixing this with dwcmshc is better, but let's wait and see whether it can be shared with other SoCs which use the same phy IP. > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); > + u32 val = 0; > + > + if (host->flags & SDHCI_HS400_TUNING) > + return 0; > + > + sdhci_writeb(host, FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, PHY_ATDL_CNFG_INPSEL), > + PHY_ATDL_CNFG_R); > + val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > + > + /* > + * configure tuning settings: > + * - center phase select code driven in block gap interval > + * - disable reporting of framing errors > + * - disable software managed tuning > + * - disable user selection of sampling window edges, > + * instead tuning calculated edges are used > + */ > + val &= ~(AT_CTRL_CI_SEL | AT_CTRL_RPT_TUNE_ERR | AT_CTRL_SW_TUNE_EN | > + FIELD_PREP(AT_CTRL_WIN_EDGE_SEL_MASK, AT_CTRL_WIN_EDGE_SEL)); > + > + /* > + * configure tuning settings: > + * - enable auto-tuning > + * - enable sampling window threshold > + * - stop clocks during phase code change > + * - set max latency in cycles between tx and rx clocks > + * - set max latency in cycles to switch output phase > + * - set max sampling window threshold value > + */ > + val |= AT_CTRL_AT_EN | AT_CTRL_SWIN_TH_EN | AT_CTRL_TUNE_CLK_STOP_EN; > + val |= FIELD_PREP(AT_CTRL_PRE_CHANGE_DLY_MASK, AT_CTRL_PRE_CHANGE_DLY); > + val |= FIELD_PREP(AT_CTRL_POST_CHANGE_DLY_MASK, AT_CTRL_POST_CHANGE_DLY); > + val |= FIELD_PREP(AT_CTRL_SWIN_TH_VAL_MASK, AT_CTRL_SWIN_TH_VAL); > + > + sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > + val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > + > + /* perform tuning */ > + sdhci_start_tuning(host); > + host->tuning_err = __sdhci_execute_tuning(host, opcode); > + if (host->tuning_err) { > + /* disable auto-tuning upon tuning error */ > + val &= ~AT_CTRL_AT_EN; > + sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > + dev_err(mmc_dev(host->mmc), "tuning failed: %d\n", host->tuning_err); > + return -EIO; > + } > + sdhci_end_tuning(host); > + > + return 0; > +} > + > +static void th1520_sdhci_reset(struct sdhci_host *host, u8 mask) > +{ > + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); > + u16 ctrl_2; > + > + sdhci_reset(host, mask); > + > + if (priv->flags & FLAG_IO_FIXED_1V8) { > + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); > + if (!(ctrl_2 & SDHCI_CTRL_VDD_180)) { > + ctrl_2 |= SDHCI_CTRL_VDD_180; > + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); > + } > + } > +} > + > static const struct sdhci_ops sdhci_dwcmshc_ops = { > .set_clock = sdhci_set_clock, > .set_bus_width = sdhci_set_bus_width, > @@ -356,6 +660,17 @@ static const struct sdhci_ops sdhci_dwcmshc_rk35xx_ops = { > .adma_write_desc = dwcmshc_adma_write_desc, > }; > > +static const struct sdhci_ops sdhci_dwcmshc_th1520_ops = { > + .set_clock = sdhci_set_clock, > + .set_bus_width = sdhci_set_bus_width, > + .set_uhs_signaling = th1520_set_uhs_signaling, > + .get_max_clock = dwcmshc_get_max_clock, > + .reset = th1520_sdhci_reset, > + .adma_write_desc = dwcmshc_adma_write_desc, > + .voltage_switch = dwcmshc_phy_1_8v_init, > + .platform_execute_tuning = &th1520_execute_tuning, > +}; > + > static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = { > .ops = &sdhci_dwcmshc_ops, > .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, > @@ -379,6 +694,12 @@ static const struct sdhci_pltfm_data sdhci_dwcmshc_rk35xx_pdata = { > SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN, > }; > > +static const struct sdhci_pltfm_data sdhci_dwcmshc_th1520_pdata = { > + .ops = &sdhci_dwcmshc_th1520_ops, > + .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, > + .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, > +}; > + > static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv) > { > int err; > @@ -447,6 +768,10 @@ static const struct of_device_id sdhci_dwcmshc_dt_ids[] = { > .compatible = "snps,dwcmshc-sdhci", > .data = &sdhci_dwcmshc_pdata, > }, > + { > + .compatible = "thead,th1520-dwcmshc", > + .data = &sdhci_dwcmshc_th1520_pdata, > + }, > {}, > }; > MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids); > @@ -542,6 +867,30 @@ static int dwcmshc_probe(struct platform_device *pdev) > goto err_clk; > } > > + if (pltfm_data == &sdhci_dwcmshc_th1520_pdata) { > + priv->delay_line = PHY_SDCLKDL_DC_DEFAULT; > + > + if ((device_property_read_bool(dev, "mmc-ddr-1_8v")) | > + (device_property_read_bool(dev, "mmc-hs200-1_8v")) | > + (device_property_read_bool(dev, "mmc-hs400-1_8v"))) > + priv->flags |= FLAG_IO_FIXED_1V8; > + else > + priv->flags &= ~FLAG_IO_FIXED_1V8; > + > + /* > + * start_signal_voltage_switch() will try 3.3V first > + * then 1.8V. Use SDHCI_SIGNALING_180 rather than > + * SDHCI_SIGNALING_330 to avoid setting voltage to 3.3V > + * in sdhci_start_signal_voltage_switch(). > + */ > + if (priv->flags & FLAG_IO_FIXED_1V8) { > + host->flags &= ~SDHCI_SIGNALING_330; > + host->flags |= SDHCI_SIGNALING_180; > + } > + > + sdhci_enable_v4_mode(host); > + } > + > #ifdef CONFIG_ACPI > if (pltfm_data == &sdhci_dwcmshc_bf3_pdata) > sdhci_enable_v4_mode(host); > > -- > 2.34.1 >
diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c index 3a3bae6948a8..0eb72544c09e 100644 --- a/drivers/mmc/host/sdhci-of-dwcmshc.c +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c @@ -8,6 +8,7 @@ */ #include <linux/acpi.h> +#include <linux/bitfield.h> #include <linux/clk.h> #include <linux/dma-mapping.h> #include <linux/iopoll.h> @@ -35,6 +36,21 @@ #define DWCMSHC_CARD_IS_EMMC BIT(0) #define DWCMSHC_ENHANCED_STROBE BIT(8) #define DWCMSHC_EMMC_ATCTRL 0x40 +/* Tuning and auto-tuning fields in AT_CTRL_R control register */ +#define AT_CTRL_AT_EN BIT(0) /* autotuning is enabled */ +#define AT_CTRL_CI_SEL BIT(1) /* interval to drive center phase select */ +#define AT_CTRL_SWIN_TH_EN BIT(2) /* sampling window threshold enable */ +#define AT_CTRL_RPT_TUNE_ERR BIT(3) /* enable reporting framing errors */ +#define AT_CTRL_SW_TUNE_EN BIT(4) /* enable software managed tuning */ +#define AT_CTRL_WIN_EDGE_SEL_MASK GENMASK(11, 8) /* bits [11:8] */ +#define AT_CTRL_WIN_EDGE_SEL 0xf /* sampling window edge select */ +#define AT_CTRL_TUNE_CLK_STOP_EN BIT(16) /* clocks stopped during phase code change */ +#define AT_CTRL_PRE_CHANGE_DLY_MASK GENMASK(18, 17) /* bits [18:17] */ +#define AT_CTRL_PRE_CHANGE_DLY 0x1 /* 2-cycle latency */ +#define AT_CTRL_POST_CHANGE_DLY_MASK GENMASK(20, 19) /* bits [20:19] */ +#define AT_CTRL_POST_CHANGE_DLY 0x3 /* 4-cycle latency */ +#define AT_CTRL_SWIN_TH_VAL_MASK GENMASK(31, 24) /* bits [31:24] */ +#define AT_CTRL_SWIN_TH_VAL 0x9 /* sampling window threshold */ /* Rockchip specific Registers */ #define DWCMSHC_EMMC_DLL_CTRL 0x800 @@ -72,6 +88,82 @@ (((x) & DWCMSHC_EMMC_DLL_TIMEOUT) == 0)) #define RK35xx_MAX_CLKS 3 +/* PHY register area pointer */ +#define DWC_MSHC_PTR_PHY_R 0x300 + +/* PHY general configuration */ +#define PHY_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x00) +#define PHY_CNFG_RSTN_DEASSERT 0x1 /* Deassert PHY reset */ +#define PHY_CNFG_PAD_SP_MASK GENMASK(19, 16) /* bits [19:16] */ +#define PHY_CNFG_PAD_SP 0x0c /* PMOS TX drive strength */ +#define PHY_CNFG_PAD_SN_MASK GENMASK(23, 20) /* bits [23:20] */ +#define PHY_CNFG_PAD_SN 0x0c /* NMOS TX drive strength */ + +/* PHY command/response pad settings */ +#define PHY_CMDPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x04) + +/* PHY data pad settings */ +#define PHY_DATAPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x06) + +/* PHY clock pad settings */ +#define PHY_CLKPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x08) + +/* PHY strobe pad settings */ +#define PHY_STBPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x0a) + +/* PHY reset pad settings */ +#define PHY_RSTNPAD_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x0c) + +/* Bitfields are common for all pad settings */ +#define PHY_PAD_RXSEL_1V8 0x1 /* Receiver type select for 1.8V */ +#define PHY_PAD_RXSEL_3V3 0x2 /* Receiver type select for 3.3V */ + +#define PHY_PAD_WEAKPULL_MASK GENMASK(4, 3) /* bits [4:3] */ +#define PHY_PAD_WEAKPULL_PULLUP 0x1 /* Weak pull up enabled */ +#define PHY_PAD_WEAKPULL_PULLDOWN 0x2 /* Weak pull down enabled */ + +#define PHY_PAD_TXSLEW_CTRL_P_MASK GENMASK(8, 5) /* bits [8:5] */ +#define PHY_PAD_TXSLEW_CTRL_P 0x3 /* Slew control for P-Type pad TX */ +#define PHY_PAD_TXSLEW_CTRL_N_MASK GENMASK(12, 9) /* bits [12:9] */ +#define PHY_PAD_TXSLEW_CTRL_N 0x3 /* Slew control for N-Type pad TX */ + +/* PHY CLK delay line settings */ +#define PHY_SDCLKDL_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x1d) +#define PHY_SDCLKDL_CNFG_UPDATE BIT(4) /* set before writing to SDCLKDL_DC */ + +/* PHY CLK delay line delay code */ +#define PHY_SDCLKDL_DC_R (DWC_MSHC_PTR_PHY_R + 0x1e) +#define PHY_SDCLKDL_DC_INITIAL 0x40 /* initial delay code */ +#define PHY_SDCLKDL_DC_DEFAULT 0x32 /* default delay code */ +#define PHY_SDCLKDL_DC_HS400 0x18 /* delay code for HS400 mode */ + +/* PHY drift_cclk_rx delay line configuration setting */ +#define PHY_ATDL_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x21) +#define PHY_ATDL_CNFG_INPSEL_MASK GENMASK(3, 2) /* bits [3:2] */ +#define PHY_ATDL_CNFG_INPSEL 0x3 /* delay line input source */ + +/* PHY DLL control settings */ +#define PHY_DLL_CTRL_R (DWC_MSHC_PTR_PHY_R + 0x24) +#define PHY_DLL_CTRL_DISABLE 0x0 /* PHY DLL is enabled */ +#define PHY_DLL_CTRL_ENABLE 0x1 /* PHY DLL is disabled */ + +/* PHY DLL configuration register 1 */ +#define PHY_DLL_CNFG1_R (DWC_MSHC_PTR_PHY_R + 0x25) +#define PHY_DLL_CNFG1_SLVDLY_MASK GENMASK(5, 4) /* bits [5:4] */ +#define PHY_DLL_CNFG1_SLVDLY 0x2 /* DLL slave update delay input */ +#define PHY_DLL_CNFG1_WAITCYCLE 0x5 /* DLL wait cycle input */ + +/* PHY DLL configuration register 2 */ +#define PHY_DLL_CNFG2_R (DWC_MSHC_PTR_PHY_R + 0x26) +#define PHY_DLL_CNFG2_JUMPSTEP 0xa /* DLL jump step input */ + +/* PHY DLL master and slave delay line configuration settings */ +#define PHY_DLLDL_CNFG_R (DWC_MSHC_PTR_PHY_R + 0x28) +#define PHY_DLLDL_CNFG_SLV_INPSEL_MASK GENMASK(6, 5) /* bits [6:5] */ +#define PHY_DLLDL_CNFG_SLV_INPSEL 0x3 /* clock source select for slave DL */ + +#define FLAG_IO_FIXED_1V8 BIT(0) + #define BOUNDARY_OK(addr, len) \ ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) @@ -92,6 +184,8 @@ struct dwcmshc_priv { struct clk *bus_clk; int vendor_specific_area1; /* P_VENDOR_SPECIFIC_AREA reg */ void *priv; /* pointer to SoC private stuff */ + u16 delay_line; + u16 flags; }; /* @@ -157,6 +251,127 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq) sdhci_request(mmc, mrq); } +static void dwcmshc_phy_1_8v_init(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); + u32 val; + + /* deassert phy reset & set tx drive strength */ + val = PHY_CNFG_RSTN_DEASSERT; + val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP); + val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN); + sdhci_writel(host, val, PHY_CNFG_R); + + /* disable delay line */ + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R); + + /* set delay line */ + sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R); + sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R); + + /* enable delay lane */ + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); + val &= ~(PHY_SDCLKDL_CNFG_UPDATE); + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); + + /* configure phy pads */ + val = PHY_PAD_RXSEL_1V8; + val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); + sdhci_writew(host, val, PHY_CMDPAD_CNFG_R); + sdhci_writew(host, val, PHY_DATAPAD_CNFG_R); + sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R); + + val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); + + val = PHY_PAD_RXSEL_1V8; + val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); + sdhci_writew(host, val, PHY_STBPAD_CNFG_R); + + /* enable data strobe mode */ + sdhci_writeb(host, FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL), + PHY_DLLDL_CNFG_R); + + /* enable phy dll */ + sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); +} + +static void dwcmshc_phy_3_3v_init(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); + u32 val; + + /* deassert phy reset & set tx drive strength */ + val = PHY_CNFG_RSTN_DEASSERT; + val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP); + val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN); + sdhci_writel(host, val, PHY_CNFG_R); + + /* disable delay line */ + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R); + + /* set delay line */ + sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R); + sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R); + + /* enable delay lane */ + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); + val &= ~(PHY_SDCLKDL_CNFG_UPDATE); + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); + + /* configure phy pads */ + val = PHY_PAD_RXSEL_3V3; + val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); + sdhci_writew(host, val, PHY_CMDPAD_CNFG_R); + sdhci_writew(host, val, PHY_DATAPAD_CNFG_R); + sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R); + + val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); + + val = PHY_PAD_RXSEL_3V3; + val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P); + val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N); + sdhci_writew(host, val, PHY_STBPAD_CNFG_R); + + /* enable phy dll */ + sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); +} + +static void th1520_sdhci_set_phy(struct sdhci_host *host) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); + u32 emmc_caps = MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO; + u16 emmc_ctrl; + + /* Before power on, set PHY configs */ + if (priv->flags & FLAG_IO_FIXED_1V8) + dwcmshc_phy_1_8v_init(host); + else + dwcmshc_phy_3_3v_init(host); + + if ((host->mmc->caps2 & emmc_caps) == emmc_caps) { + emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); + emmc_ctrl |= DWCMSHC_CARD_IS_EMMC; + sdhci_writew(host, emmc_ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); + } + + sdhci_writeb(host, FIELD_PREP(PHY_DLL_CNFG1_SLVDLY_MASK, PHY_DLL_CNFG1_SLVDLY) | + PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R); +} + static void dwcmshc_set_uhs_signaling(struct sdhci_host *host, unsigned int timing) { @@ -189,9 +404,25 @@ static void dwcmshc_set_uhs_signaling(struct sdhci_host *host, ctrl_2 |= DWCMSHC_CTRL_HS400; } + if (priv->flags & FLAG_IO_FIXED_1V8) + ctrl_2 |= SDHCI_CTRL_VDD_180; sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); } +static void th1520_set_uhs_signaling(struct sdhci_host *host, + unsigned int timing) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); + + dwcmshc_set_uhs_signaling(host, timing); + if (timing == MMC_TIMING_MMC_HS400) + priv->delay_line = PHY_SDCLKDL_DC_HS400; + else + sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R); + th1520_sdhci_set_phy(host); +} + static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc, struct mmc_ios *ios) { @@ -338,6 +569,79 @@ static void rk35xx_sdhci_reset(struct sdhci_host *host, u8 mask) sdhci_reset(host, mask); } +static int th1520_execute_tuning(struct sdhci_host *host, u32 opcode) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); + u32 val = 0; + + if (host->flags & SDHCI_HS400_TUNING) + return 0; + + sdhci_writeb(host, FIELD_PREP(PHY_ATDL_CNFG_INPSEL_MASK, PHY_ATDL_CNFG_INPSEL), + PHY_ATDL_CNFG_R); + val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); + + /* + * configure tuning settings: + * - center phase select code driven in block gap interval + * - disable reporting of framing errors + * - disable software managed tuning + * - disable user selection of sampling window edges, + * instead tuning calculated edges are used + */ + val &= ~(AT_CTRL_CI_SEL | AT_CTRL_RPT_TUNE_ERR | AT_CTRL_SW_TUNE_EN | + FIELD_PREP(AT_CTRL_WIN_EDGE_SEL_MASK, AT_CTRL_WIN_EDGE_SEL)); + + /* + * configure tuning settings: + * - enable auto-tuning + * - enable sampling window threshold + * - stop clocks during phase code change + * - set max latency in cycles between tx and rx clocks + * - set max latency in cycles to switch output phase + * - set max sampling window threshold value + */ + val |= AT_CTRL_AT_EN | AT_CTRL_SWIN_TH_EN | AT_CTRL_TUNE_CLK_STOP_EN; + val |= FIELD_PREP(AT_CTRL_PRE_CHANGE_DLY_MASK, AT_CTRL_PRE_CHANGE_DLY); + val |= FIELD_PREP(AT_CTRL_POST_CHANGE_DLY_MASK, AT_CTRL_POST_CHANGE_DLY); + val |= FIELD_PREP(AT_CTRL_SWIN_TH_VAL_MASK, AT_CTRL_SWIN_TH_VAL); + + sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); + val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); + + /* perform tuning */ + sdhci_start_tuning(host); + host->tuning_err = __sdhci_execute_tuning(host, opcode); + if (host->tuning_err) { + /* disable auto-tuning upon tuning error */ + val &= ~AT_CTRL_AT_EN; + sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); + dev_err(mmc_dev(host->mmc), "tuning failed: %d\n", host->tuning_err); + return -EIO; + } + sdhci_end_tuning(host); + + return 0; +} + +static void th1520_sdhci_reset(struct sdhci_host *host, u8 mask) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host); + u16 ctrl_2; + + sdhci_reset(host, mask); + + if (priv->flags & FLAG_IO_FIXED_1V8) { + ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2); + if (!(ctrl_2 & SDHCI_CTRL_VDD_180)) { + ctrl_2 |= SDHCI_CTRL_VDD_180; + sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2); + } + } +} + static const struct sdhci_ops sdhci_dwcmshc_ops = { .set_clock = sdhci_set_clock, .set_bus_width = sdhci_set_bus_width, @@ -356,6 +660,17 @@ static const struct sdhci_ops sdhci_dwcmshc_rk35xx_ops = { .adma_write_desc = dwcmshc_adma_write_desc, }; +static const struct sdhci_ops sdhci_dwcmshc_th1520_ops = { + .set_clock = sdhci_set_clock, + .set_bus_width = sdhci_set_bus_width, + .set_uhs_signaling = th1520_set_uhs_signaling, + .get_max_clock = dwcmshc_get_max_clock, + .reset = th1520_sdhci_reset, + .adma_write_desc = dwcmshc_adma_write_desc, + .voltage_switch = dwcmshc_phy_1_8v_init, + .platform_execute_tuning = &th1520_execute_tuning, +}; + static const struct sdhci_pltfm_data sdhci_dwcmshc_pdata = { .ops = &sdhci_dwcmshc_ops, .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, @@ -379,6 +694,12 @@ static const struct sdhci_pltfm_data sdhci_dwcmshc_rk35xx_pdata = { SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN, }; +static const struct sdhci_pltfm_data sdhci_dwcmshc_th1520_pdata = { + .ops = &sdhci_dwcmshc_th1520_ops, + .quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN, + .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN, +}; + static int dwcmshc_rk35xx_init(struct sdhci_host *host, struct dwcmshc_priv *dwc_priv) { int err; @@ -447,6 +768,10 @@ static const struct of_device_id sdhci_dwcmshc_dt_ids[] = { .compatible = "snps,dwcmshc-sdhci", .data = &sdhci_dwcmshc_pdata, }, + { + .compatible = "thead,th1520-dwcmshc", + .data = &sdhci_dwcmshc_th1520_pdata, + }, {}, }; MODULE_DEVICE_TABLE(of, sdhci_dwcmshc_dt_ids); @@ -542,6 +867,30 @@ static int dwcmshc_probe(struct platform_device *pdev) goto err_clk; } + if (pltfm_data == &sdhci_dwcmshc_th1520_pdata) { + priv->delay_line = PHY_SDCLKDL_DC_DEFAULT; + + if ((device_property_read_bool(dev, "mmc-ddr-1_8v")) | + (device_property_read_bool(dev, "mmc-hs200-1_8v")) | + (device_property_read_bool(dev, "mmc-hs400-1_8v"))) + priv->flags |= FLAG_IO_FIXED_1V8; + else + priv->flags &= ~FLAG_IO_FIXED_1V8; + + /* + * start_signal_voltage_switch() will try 3.3V first + * then 1.8V. Use SDHCI_SIGNALING_180 rather than + * SDHCI_SIGNALING_330 to avoid setting voltage to 3.3V + * in sdhci_start_signal_voltage_switch(). + */ + if (priv->flags & FLAG_IO_FIXED_1V8) { + host->flags &= ~SDHCI_SIGNALING_330; + host->flags |= SDHCI_SIGNALING_180; + } + + sdhci_enable_v4_mode(host); + } + #ifdef CONFIG_ACPI if (pltfm_data == &sdhci_dwcmshc_bf3_pdata) sdhci_enable_v4_mode(host);