| Message ID | 20230921-th1520-mmc-v1-3-49f76c274fb3@baylibre.com |
|---|---|
| State | New |
| Headers | show |
| Series | None | expand |
On 22/09/23 04:49, 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. > > Signed-off-by: Drew Fustini <dfustini@baylibre.com> > --- > drivers/mmc/host/sdhci-of-dwcmshc.c | 456 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 456 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c > index 3a3bae6948a8..7294bf1afb7d 100644 > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c > @@ -35,6 +35,26 @@ > #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 0x1 /* autotuning is enabled */ > +#define AT_CTRL_CI_SEL_SHIFT 0x1 /* bit 1 */ > +#define AT_CTRL_CI_SEL 0x1 /* interval to drive center phase select */ > +#define AT_CTRL_SWIN_TH_EN_SHIFT 0x2 /* bit 2 */ > +#define AT_CTRL_SWIN_TH_EN 0x1 /* sampling window threshold enable */ > +#define AT_CTRL_RPT_TUNE_ERR_SHIFT 0x3 /* bit 3 */ > +#define AT_CTRL_RPT_TUNE_ERR 0x1 /* enable reporting framing errors */ > +#define AT_CTRL_SW_TUNE_EN_SHIFT 0x4 /* bit 4 */ > +#define AT_CTRL_SW_TUNE_EN 0x1 /* enable software managed tuning */ > +#define AT_CTRL_WIN_EDGE_SEL_SHIFT 0x8 /* bits [11:8] */ > +#define AT_CTRL_WIN_EDGE_SEL 0xf /* sampling window edge select */ > +#define AT_CTRL_TUNE_CLK_STOP_EN_SHIFT 0x10 /* bit 16 */ > +#define AT_CTRL_TUNE_CLK_STOP_EN 0x1 /* clocks stopped during phase code change */ > +#define AT_CTRL_PRE_CHANGE_DLY_SHIFT 0x11 /* bits [18:17] */ > +#define AT_CTRL_PRE_CHANGE_DLY 0x1 /* 2-cycle latency */ > +#define AT_CTRL_POST_CHANGE_DLY_SHIFT 0x13 /* bits [20:19] */ > +#define AT_CTRL_POST_CHANGE_DLY 0x3 /* 4-cycle latency */ > +#define AT_CTRL_SWIN_TH_VAL_SHIFT 0x18 /* bits [31:24] */ > +#define AT_CTRL_SWIN_TH_VAL 0x9 /* sampling window threshold */ Here and elsewhere, please try to make use of BIT(), GENMASK(), FIELD_PREP(), FIELD_GET()
On Mon, Sep 25, 2023 at 01:35:36PM +0300, Adrian Hunter wrote: > On 22/09/23 04:49, 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. > > > > Signed-off-by: Drew Fustini <dfustini@baylibre.com> > > --- > > drivers/mmc/host/sdhci-of-dwcmshc.c | 456 ++++++++++++++++++++++++++++++++++++ > > 1 file changed, 456 insertions(+) > > > > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c > > index 3a3bae6948a8..7294bf1afb7d 100644 > > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c > > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c > > @@ -35,6 +35,26 @@ > > #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 0x1 /* autotuning is enabled */ > > +#define AT_CTRL_CI_SEL_SHIFT 0x1 /* bit 1 */ > > +#define AT_CTRL_CI_SEL 0x1 /* interval to drive center phase select */ > > +#define AT_CTRL_SWIN_TH_EN_SHIFT 0x2 /* bit 2 */ > > +#define AT_CTRL_SWIN_TH_EN 0x1 /* sampling window threshold enable */ > > +#define AT_CTRL_RPT_TUNE_ERR_SHIFT 0x3 /* bit 3 */ > > +#define AT_CTRL_RPT_TUNE_ERR 0x1 /* enable reporting framing errors */ > > +#define AT_CTRL_SW_TUNE_EN_SHIFT 0x4 /* bit 4 */ > > +#define AT_CTRL_SW_TUNE_EN 0x1 /* enable software managed tuning */ > > +#define AT_CTRL_WIN_EDGE_SEL_SHIFT 0x8 /* bits [11:8] */ > > +#define AT_CTRL_WIN_EDGE_SEL 0xf /* sampling window edge select */ > > +#define AT_CTRL_TUNE_CLK_STOP_EN_SHIFT 0x10 /* bit 16 */ > > +#define AT_CTRL_TUNE_CLK_STOP_EN 0x1 /* clocks stopped during phase code change */ > > +#define AT_CTRL_PRE_CHANGE_DLY_SHIFT 0x11 /* bits [18:17] */ > > +#define AT_CTRL_PRE_CHANGE_DLY 0x1 /* 2-cycle latency */ > > +#define AT_CTRL_POST_CHANGE_DLY_SHIFT 0x13 /* bits [20:19] */ > > +#define AT_CTRL_POST_CHANGE_DLY 0x3 /* 4-cycle latency */ > > +#define AT_CTRL_SWIN_TH_VAL_SHIFT 0x18 /* bits [31:24] */ > > +#define AT_CTRL_SWIN_TH_VAL 0x9 /* sampling window threshold */ > > Here and elsewhere, please try to make use of BIT(), GENMASK(), > FIELD_PREP(), FIELD_GET() Thank you for the advice. FIELD_PREP() and FIELD_GET() look like they can make the code simpler. I'll make use of those macros in the next version. thanks, drew
On Thu, Sep 21, 2023 at 06:49:50PM -0700, 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. > > Signed-off-by: Drew Fustini <dfustini@baylibre.com> Hi Drew, Thanks for doing this and sorry for being late for this code review. Some comments below. > --- > drivers/mmc/host/sdhci-of-dwcmshc.c | 456 ++++++++++++++++++++++++++++++++++++ > 1 file changed, 456 insertions(+) > > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c > index 3a3bae6948a8..7294bf1afb7d 100644 > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c > @@ -35,6 +35,26 @@ > #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 0x1 /* autotuning is enabled */ > +#define AT_CTRL_CI_SEL_SHIFT 0x1 /* bit 1 */ > +#define AT_CTRL_CI_SEL 0x1 /* interval to drive center phase select */ > +#define AT_CTRL_SWIN_TH_EN_SHIFT 0x2 /* bit 2 */ > +#define AT_CTRL_SWIN_TH_EN 0x1 /* sampling window threshold enable */ > +#define AT_CTRL_RPT_TUNE_ERR_SHIFT 0x3 /* bit 3 */ > +#define AT_CTRL_RPT_TUNE_ERR 0x1 /* enable reporting framing errors */ > +#define AT_CTRL_SW_TUNE_EN_SHIFT 0x4 /* bit 4 */ > +#define AT_CTRL_SW_TUNE_EN 0x1 /* enable software managed tuning */ > +#define AT_CTRL_WIN_EDGE_SEL_SHIFT 0x8 /* bits [11:8] */ > +#define AT_CTRL_WIN_EDGE_SEL 0xf /* sampling window edge select */ > +#define AT_CTRL_TUNE_CLK_STOP_EN_SHIFT 0x10 /* bit 16 */ > +#define AT_CTRL_TUNE_CLK_STOP_EN 0x1 /* clocks stopped during phase code change */ > +#define AT_CTRL_PRE_CHANGE_DLY_SHIFT 0x11 /* bits [18:17] */ > +#define AT_CTRL_PRE_CHANGE_DLY 0x1 /* 2-cycle latency */ > +#define AT_CTRL_POST_CHANGE_DLY_SHIFT 0x13 /* bits [20:19] */ > +#define AT_CTRL_POST_CHANGE_DLY 0x3 /* 4-cycle latency */ > +#define AT_CTRL_SWIN_TH_VAL_SHIFT 0x18 /* bits [31:24] */ > +#define AT_CTRL_SWIN_TH_VAL 0x9 /* sampling window threshold */ > > /* Rockchip specific Registers */ > #define DWCMSHC_EMMC_DLL_CTRL 0x800 > @@ -72,6 +92,84 @@ > (((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_SHIFT 0x10 /* bits [16:9] */ > +#define PHY_CNFG_PAD_SP_VALUE 0x0c /* PMOS TX drive strength */ > +#define PHY_CNFG_PAD_SN_SHIFT 0x14 /* bits [23:20] */ > +#define PHY_CNFG_PAD_SN_VALUE 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_SHIFT 0x3 /* bits [4:3] */ > +#define PHY_PAD_WEAKPULL_PULLUP 0x1 /* Weak pull down enabled */ > +#define PHY_PAD_WEAKPULL_PULLDOWN 0x2 /* Weak pull down enabled */ > + > +#define PHY_PAD_TXSLEW_CTRL_P_SHIFT 0x5 /* bits [8:5] */ > +#define PHY_PAD_TXSLEW_CTRL_P_VALUE 0x3 /* Slew control for P-Type pad TX */ > +#define PHY_PAD_TXSLEW_CTRL_N_SHIFT 0x9 /* bits [12:9] */ > +#define PHY_PAD_TXSLEW_CTRL_N_VALUE 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_SHIFT 0x4 /* bit 4 */ > +#define PHY_SDCLKDL_CNFG_UPDATE_DC 0x1 /* 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_SHIFT 0x2 /* bits [3:2] */ > +#define PHY_ATDL_CNFG_INPSEL_VALUE 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_SHIFT 0x4 /* bits [5:4] */ > +#define PHY_DLL_CNFG1_SLVDLY_VALUE 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_SHIFT 0x5 /* bits [6:5] */ > +#define PHY_DLLDL_CNFG_SLV_INPSEL_VALUE 0x3 /* clock source select for slave DL */ > + > +#define FLAG_PULL_UP_EN BIT(0) > +#define FLAG_IO_FIXED_1V8 BIT(1) > + > #define BOUNDARY_OK(addr, len) \ > ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) > > @@ -92,6 +190,8 @@ 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 +257,206 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq) > sdhci_request(mmc, mrq); > } > > +static void th1520_phy_1_8v_init_no_pull(struct sdhci_host *host) > +{ > + u32 val; > + > + /* deassert phy reset */ > + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT, PHY_CNFG_R); > + > + /* disable delay line */ > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, > + PHY_SDCLKDL_CNFG_R); > + > + /* set delay line */ > + sdhci_writeb(host, PHY_SDCLKDL_DC_INITIAL, PHY_SDCLKDL_DC_R); > + > + /* enable delay lane */ > + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); > + val &= ~(PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > + > + /* configure phy pads */ > + val = sdhci_readw(host, PHY_CMDPAD_CNFG_R); > + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_CMDPAD_CNFG_R); > + > + val = sdhci_readw(host, PHY_DATAPAD_CNFG_R); > + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_DATAPAD_CNFG_R); > + > + val = sdhci_readw(host, PHY_RSTNPAD_CNFG_R); > + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_RSTNPAD_CNFG_R); > + > + val = sdhci_readw(host, PHY_STBPAD_CNFG_R); > + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_STBPAD_CNFG_R); > + > + /* enable phy dll */ > + val = sdhci_readb(host, PHY_DLL_CTRL_R); > + sdhci_writeb(host, val | PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); > +} > + > +static void th1520_phy_3_3v_init_no_pull(struct sdhci_host *host) > +{ > + u32 val; > + > + /* deassert phy reset */ > + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT, PHY_CNFG_R); > + > + /* disable delay line */ > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, > + PHY_SDCLKDL_CNFG_R); > + > + /* set delay line */ > + sdhci_writeb(host, PHY_SDCLKDL_DC_INITIAL, PHY_SDCLKDL_DC_R); > + > + /* enable delay lane */ > + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); > + val &= ~(PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > + > + /* configure phy pads */ > + val = sdhci_readw(host, PHY_CMDPAD_CNFG_R); > + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_CMDPAD_CNFG_R); > + > + val = sdhci_readw(host, PHY_DATAPAD_CNFG_R); > + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_DATAPAD_CNFG_R); > + > + val = sdhci_readw(host, PHY_RSTNPAD_CNFG_R); > + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_RSTNPAD_CNFG_R); > + > + val = sdhci_readw(host, PHY_STBPAD_CNFG_R); > + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_STBPAD_CNFG_R); > + > + /* enable phy dll */ > + val = sdhci_readb(host, PHY_DLL_CTRL_R); > + sdhci_writeb(host, val | PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); > +} > + > +static void th1520_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; > + > + if (!priv) > + return; > + > + if (!(priv->flags & FLAG_PULL_UP_EN)) { > + th1520_phy_1_8v_init_no_pull(host); > + return; > + } > + > + /* deassert phy reset & set tx drive strength */ > + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT | > + (PHY_CNFG_PAD_SP_VALUE << PHY_CNFG_PAD_SP_SHIFT) | > + (PHY_CNFG_PAD_SN_VALUE << PHY_CNFG_PAD_SN_SHIFT), > + PHY_CNFG_R); > + > + /* disable delay line */ > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, > + 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_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > + > + /* configure phy pads */ > + val = PHY_PAD_RXSEL_1V8 | (PHY_PAD_WEAKPULL_PULLUP << PHY_PAD_WEAKPULL_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > + 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 = (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); > + > + val = PHY_PAD_RXSEL_1V8 | (PHY_PAD_WEAKPULL_PULLDOWN << PHY_PAD_WEAKPULL_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > + sdhci_writew(host, val, PHY_STBPAD_CNFG_R); > + > + /* enable data strobe mode */ > + sdhci_writeb(host, PHY_DLLDL_CNFG_SLV_INPSEL_VALUE << PHY_DLLDL_CNFG_SLV_INPSEL_SHIFT, > + PHY_DLLDL_CNFG_R); > + > + /* enable phy dll */ > + sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); > +} > + > +static void th1520_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; > + > + if (!(priv->flags & FLAG_PULL_UP_EN)) { > + th1520_phy_3_3v_init_no_pull(host); > + return; > + } > + > + /* deassert phy reset & set tx drive strength */ > + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT | > + (PHY_CNFG_PAD_SP_VALUE << PHY_CNFG_PAD_SP_SHIFT) | > + (PHY_CNFG_PAD_SN_VALUE << PHY_CNFG_PAD_SN_SHIFT), > + PHY_CNFG_R); > + > + /* disable delay line */ > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, > + 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_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > + > + /* configure phy pads */ > + val = PHY_PAD_RXSEL_3V3 | (PHY_PAD_WEAKPULL_PULLUP << PHY_PAD_WEAKPULL_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > + 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 = (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); > + > + val = PHY_PAD_RXSEL_3V3 | (PHY_PAD_WEAKPULL_PULLDOWN << PHY_PAD_WEAKPULL_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > + sdhci_writew(host, val, PHY_STBPAD_CNFG_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); > + u16 emmc_ctrl; > + > + /* Before power on, set PHY configs */ > + if (host->mmc->caps & MMC_CAP_NONREMOVABLE) { check flag & FLAG_IO_FIXED_1V8 instead? Because I didn't see why 3.3v can't be non-removeable. I know you only brought up emmc now, but we can also prepare for sdio/sd support at the same time. > + th1520_phy_1_8v_init(host); > + emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); > + emmc_ctrl |= DWCMSHC_CARD_IS_EMMC; can we check host->mmc->caps2 to know whether this is eMMC or not, then set this bit for eMMC after that. And setting DWCMSHC_CARD_IS_EMMC should be orthogonalized with 3.3v/1.8v etc. > + sdhci_writew(host, emmc_ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); > + } else { > + th1520_phy_3_3v_init(host); > + } > + > + sdhci_writeb(host, (PHY_DLL_CNFG1_SLVDLY_VALUE << PHY_DLL_CNFG1_SLVDLY_SHIFT) | I'm not sure whether we need to get the delay value from DT. Do emmc, sd and sdio share the same delay value? > + PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R); > +} > + > static void dwcmshc_set_uhs_signaling(struct sdhci_host *host, > unsigned int timing) > { > @@ -189,9 +489,30 @@ 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); > + u32 reg; > + > + dwcmshc_set_uhs_signaling(host, timing); > + if (timing == MMC_TIMING_MMC_HS400) { > + reg = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > + reg &= ~AT_CTRL_AT_EN; > + sdhci_writel(host, reg, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); can we move the auto tuning bit setting to tuning routine? > + priv->delay_line = PHY_SDCLKDL_DC_HS400; this delay line may need to be gotten from DT? > + th1520_sdhci_set_phy(host); > + } else { > + sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R); > + } > +} > + > static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc, > struct mmc_ios *ios) > { > @@ -338,6 +659,91 @@ 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, PHY_ATDL_CNFG_INPSEL_VALUE << PHY_ATDL_CNFG_INPSEL_SHIFT, > + 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_CI_SEL_SHIFT) | > + (AT_CTRL_RPT_TUNE_ERR << AT_CTRL_RPT_TUNE_ERR_SHIFT) | > + (AT_CTRL_SW_TUNE_EN << AT_CTRL_SW_TUNE_EN_SHIFT) | > + (AT_CTRL_WIN_EDGE_SEL << AT_CTRL_WIN_EDGE_SEL_SHIFT)); > + > + /* > + * 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_SWIN_TH_EN_SHIFT) | > + (AT_CTRL_TUNE_CLK_STOP_EN << AT_CTRL_TUNE_CLK_STOP_EN_SHIFT) | > + (AT_CTRL_PRE_CHANGE_DLY << AT_CTRL_PRE_CHANGE_DLY_SHIFT) | > + (AT_CTRL_POST_CHANGE_DLY << AT_CTRL_POST_CHANGE_DLY_SHIFT) | > + (AT_CTRL_SWIN_TH_VAL << AT_CTRL_SWIN_TH_VAL_SHIFT); > + > + sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > + val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > + > + /* check if is possible to enable auto-tuning */ > + if (!(val & AT_CTRL_AT_EN)) { > + dev_err(mmc_dev(host->mmc), "failed to enable auto tuning\n"); > + return -EIO; > + } > + > + /* disable auto tuning */ > + val &= ~AT_CTRL_AT_EN; > + sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); AFAIK, the HW support auto tuning, can we enable it? > + > + /* perform tuning */ > + sdhci_start_tuning(host); > + host->tuning_err = __sdhci_execute_tuning(host, opcode); > + if (host->tuning_err) { > + val &= ~AT_CTRL_AT_EN; It looks like auto tunning is never enabled, so why do clear it here? > + 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 +762,17 @@ 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 = th1520_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 +796,12 @@ 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 +870,10 @@ 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 +969,35 @@ 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; Ditto. > + > + if (device_property_present(&pdev->dev, "thead,phy-pull-up")) > + priv->flags |= FLAG_PULL_UP_EN; > + else > + priv->flags &= ~FLAG_PULL_UP_EN; > + > + 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 ranther 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 >
On Thu, Oct 05, 2023 at 12:19:03AM +0800, Jisheng Zhang wrote: > On Thu, Sep 21, 2023 at 06:49:50PM -0700, 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. > > > > Signed-off-by: Drew Fustini <dfustini@baylibre.com> > > Hi Drew, > Thanks for doing this and sorry for being late for this code review. Some > comments below. > > > --- > > drivers/mmc/host/sdhci-of-dwcmshc.c | 456 ++++++++++++++++++++++++++++++++++++ > > 1 file changed, 456 insertions(+) > > > > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c > > index 3a3bae6948a8..7294bf1afb7d 100644 > > --- a/drivers/mmc/host/sdhci-of-dwcmshc.c > > +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c > > @@ -35,6 +35,26 @@ > > #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 0x1 /* autotuning is enabled */ > > +#define AT_CTRL_CI_SEL_SHIFT 0x1 /* bit 1 */ > > +#define AT_CTRL_CI_SEL 0x1 /* interval to drive center phase select */ > > +#define AT_CTRL_SWIN_TH_EN_SHIFT 0x2 /* bit 2 */ > > +#define AT_CTRL_SWIN_TH_EN 0x1 /* sampling window threshold enable */ > > +#define AT_CTRL_RPT_TUNE_ERR_SHIFT 0x3 /* bit 3 */ > > +#define AT_CTRL_RPT_TUNE_ERR 0x1 /* enable reporting framing errors */ > > +#define AT_CTRL_SW_TUNE_EN_SHIFT 0x4 /* bit 4 */ > > +#define AT_CTRL_SW_TUNE_EN 0x1 /* enable software managed tuning */ > > +#define AT_CTRL_WIN_EDGE_SEL_SHIFT 0x8 /* bits [11:8] */ > > +#define AT_CTRL_WIN_EDGE_SEL 0xf /* sampling window edge select */ > > +#define AT_CTRL_TUNE_CLK_STOP_EN_SHIFT 0x10 /* bit 16 */ > > +#define AT_CTRL_TUNE_CLK_STOP_EN 0x1 /* clocks stopped during phase code change */ > > +#define AT_CTRL_PRE_CHANGE_DLY_SHIFT 0x11 /* bits [18:17] */ > > +#define AT_CTRL_PRE_CHANGE_DLY 0x1 /* 2-cycle latency */ > > +#define AT_CTRL_POST_CHANGE_DLY_SHIFT 0x13 /* bits [20:19] */ > > +#define AT_CTRL_POST_CHANGE_DLY 0x3 /* 4-cycle latency */ > > +#define AT_CTRL_SWIN_TH_VAL_SHIFT 0x18 /* bits [31:24] */ > > +#define AT_CTRL_SWIN_TH_VAL 0x9 /* sampling window threshold */ > > > > /* Rockchip specific Registers */ > > #define DWCMSHC_EMMC_DLL_CTRL 0x800 > > @@ -72,6 +92,84 @@ > > (((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_SHIFT 0x10 /* bits [16:9] */ > > +#define PHY_CNFG_PAD_SP_VALUE 0x0c /* PMOS TX drive strength */ > > +#define PHY_CNFG_PAD_SN_SHIFT 0x14 /* bits [23:20] */ > > +#define PHY_CNFG_PAD_SN_VALUE 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_SHIFT 0x3 /* bits [4:3] */ > > +#define PHY_PAD_WEAKPULL_PULLUP 0x1 /* Weak pull down enabled */ > > +#define PHY_PAD_WEAKPULL_PULLDOWN 0x2 /* Weak pull down enabled */ > > + > > +#define PHY_PAD_TXSLEW_CTRL_P_SHIFT 0x5 /* bits [8:5] */ > > +#define PHY_PAD_TXSLEW_CTRL_P_VALUE 0x3 /* Slew control for P-Type pad TX */ > > +#define PHY_PAD_TXSLEW_CTRL_N_SHIFT 0x9 /* bits [12:9] */ > > +#define PHY_PAD_TXSLEW_CTRL_N_VALUE 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_SHIFT 0x4 /* bit 4 */ > > +#define PHY_SDCLKDL_CNFG_UPDATE_DC 0x1 /* 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_SHIFT 0x2 /* bits [3:2] */ > > +#define PHY_ATDL_CNFG_INPSEL_VALUE 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_SHIFT 0x4 /* bits [5:4] */ > > +#define PHY_DLL_CNFG1_SLVDLY_VALUE 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_SHIFT 0x5 /* bits [6:5] */ > > +#define PHY_DLLDL_CNFG_SLV_INPSEL_VALUE 0x3 /* clock source select for slave DL */ > > + > > +#define FLAG_PULL_UP_EN BIT(0) > > +#define FLAG_IO_FIXED_1V8 BIT(1) > > + > > #define BOUNDARY_OK(addr, len) \ > > ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) > > > > @@ -92,6 +190,8 @@ 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 +257,206 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq) > > sdhci_request(mmc, mrq); > > } > > > > +static void th1520_phy_1_8v_init_no_pull(struct sdhci_host *host) > > +{ > > + u32 val; > > + > > + /* deassert phy reset */ > > + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT, PHY_CNFG_R); > > + > > + /* disable delay line */ > > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, > > + PHY_SDCLKDL_CNFG_R); > > + > > + /* set delay line */ > > + sdhci_writeb(host, PHY_SDCLKDL_DC_INITIAL, PHY_SDCLKDL_DC_R); > > + > > + /* enable delay lane */ > > + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); > > + val &= ~(PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); > > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > > + > > + /* configure phy pads */ > > + val = sdhci_readw(host, PHY_CMDPAD_CNFG_R); > > + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_CMDPAD_CNFG_R); > > + > > + val = sdhci_readw(host, PHY_DATAPAD_CNFG_R); > > + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_DATAPAD_CNFG_R); > > + > > + val = sdhci_readw(host, PHY_RSTNPAD_CNFG_R); > > + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_RSTNPAD_CNFG_R); > > + > > + val = sdhci_readw(host, PHY_STBPAD_CNFG_R); > > + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_STBPAD_CNFG_R); > > + > > + /* enable phy dll */ > > + val = sdhci_readb(host, PHY_DLL_CTRL_R); > > + sdhci_writeb(host, val | PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); > > +} > > + > > +static void th1520_phy_3_3v_init_no_pull(struct sdhci_host *host) > > +{ > > + u32 val; > > + > > + /* deassert phy reset */ > > + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT, PHY_CNFG_R); > > + > > + /* disable delay line */ > > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, > > + PHY_SDCLKDL_CNFG_R); > > + > > + /* set delay line */ > > + sdhci_writeb(host, PHY_SDCLKDL_DC_INITIAL, PHY_SDCLKDL_DC_R); > > + > > + /* enable delay lane */ > > + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); > > + val &= ~(PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); > > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > > + > > + /* configure phy pads */ > > + val = sdhci_readw(host, PHY_CMDPAD_CNFG_R); > > + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_CMDPAD_CNFG_R); > > + > > + val = sdhci_readw(host, PHY_DATAPAD_CNFG_R); > > + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_DATAPAD_CNFG_R); > > + > > + val = sdhci_readw(host, PHY_RSTNPAD_CNFG_R); > > + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_RSTNPAD_CNFG_R); > > + > > + val = sdhci_readw(host, PHY_STBPAD_CNFG_R); > > + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_STBPAD_CNFG_R); > > + > > + /* enable phy dll */ > > + val = sdhci_readb(host, PHY_DLL_CTRL_R); > > + sdhci_writeb(host, val | PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); > > +} > > + > > +static void th1520_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; > > + > > + if (!priv) > > + return; > > + > > + if (!(priv->flags & FLAG_PULL_UP_EN)) { > > + th1520_phy_1_8v_init_no_pull(host); > > + return; > > + } > > + > > + /* deassert phy reset & set tx drive strength */ > > + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT | > > + (PHY_CNFG_PAD_SP_VALUE << PHY_CNFG_PAD_SP_SHIFT) | > > + (PHY_CNFG_PAD_SN_VALUE << PHY_CNFG_PAD_SN_SHIFT), > > + PHY_CNFG_R); > > + > > + /* disable delay line */ > > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, > > + 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_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); > > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > > + > > + /* configure phy pads */ > > + val = PHY_PAD_RXSEL_1V8 | (PHY_PAD_WEAKPULL_PULLUP << PHY_PAD_WEAKPULL_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > > + 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 = (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > > + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); > > + > > + val = PHY_PAD_RXSEL_1V8 | (PHY_PAD_WEAKPULL_PULLDOWN << PHY_PAD_WEAKPULL_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > > + sdhci_writew(host, val, PHY_STBPAD_CNFG_R); > > + > > + /* enable data strobe mode */ > > + sdhci_writeb(host, PHY_DLLDL_CNFG_SLV_INPSEL_VALUE << PHY_DLLDL_CNFG_SLV_INPSEL_SHIFT, > > + PHY_DLLDL_CNFG_R); > > + > > + /* enable phy dll */ > > + sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); > > +} > > + > > +static void th1520_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; > > + > > + if (!(priv->flags & FLAG_PULL_UP_EN)) { > > + th1520_phy_3_3v_init_no_pull(host); > > + return; > > + } > > + > > + /* deassert phy reset & set tx drive strength */ > > + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT | > > + (PHY_CNFG_PAD_SP_VALUE << PHY_CNFG_PAD_SP_SHIFT) | > > + (PHY_CNFG_PAD_SN_VALUE << PHY_CNFG_PAD_SN_SHIFT), > > + PHY_CNFG_R); > > + > > + /* disable delay line */ > > + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, > > + 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_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); > > + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); > > + > > + /* configure phy pads */ > > + val = PHY_PAD_RXSEL_3V3 | (PHY_PAD_WEAKPULL_PULLUP << PHY_PAD_WEAKPULL_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > > + 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 = (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > > + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); > > + > > + val = PHY_PAD_RXSEL_3V3 | (PHY_PAD_WEAKPULL_PULLDOWN << PHY_PAD_WEAKPULL_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | > > + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); > > + sdhci_writew(host, val, PHY_STBPAD_CNFG_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); > > + u16 emmc_ctrl; > > + > > + /* Before power on, set PHY configs */ > > + if (host->mmc->caps & MMC_CAP_NONREMOVABLE) { > > check flag & FLAG_IO_FIXED_1V8 instead? Because I didn't see why > 3.3v can't be non-removeable. I know you only brought up emmc > now, but we can also prepare for sdio/sd support at the same time. Okay, that does seem to make more sense to check for the 1.8V flag when deciding whether to call th1520_phy_1_8v_init(). > > > + th1520_phy_1_8v_init(host); > > + emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); > > + emmc_ctrl |= DWCMSHC_CARD_IS_EMMC; > > can we check host->mmc->caps2 to know whether this is eMMC or not, then > set this bit for eMMC after that. > > And setting DWCMSHC_CARD_IS_EMMC should be orthogonalized with 3.3v/1.8v > etc. Okay, I'll move the write to emmc_ctrl outside of this if() block. I'll put it in a new if() block directly after. There is MMC_CAP_NONREMOVABLE but that is mmc_host->caps and not mmc_host->caps2. Is that what you meant? > > > + sdhci_writew(host, emmc_ctrl, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL); > > + } else { > > + th1520_phy_3_3v_init(host); > > > + } > > + > > + sdhci_writeb(host, (PHY_DLL_CNFG1_SLVDLY_VALUE << PHY_DLL_CNFG1_SLVDLY_SHIFT) | > > I'm not sure whether we need to get the delay value from DT. > Do emmc, sd and sdio share the same delay value? The PHY_DLL_CNFG1_SLVDLY_VALUE ("DLL slave update delay input") field appeared to be the same for all instances in the T-Head SDK. Whereas, the PHY_SDCLKDL_DC register ("CLK delay line delay code") does have different value depending on whether HS400 mode is used. > > > + PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R); > > +} > > + > > static void dwcmshc_set_uhs_signaling(struct sdhci_host *host, > > unsigned int timing) > > { > > @@ -189,9 +489,30 @@ 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); > > + u32 reg; > > + > > + dwcmshc_set_uhs_signaling(host, timing); > > + if (timing == MMC_TIMING_MMC_HS400) { > > + reg = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > > + reg &= ~AT_CTRL_AT_EN; > > + sdhci_writel(host, reg, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > > can we move the auto tuning bit setting to tuning routine? It is unclear to me why the T-Head's version manipulated AT_CTRL_AT_EN in the th1520_set_uhs_signaling(). I can try removing it and seeing if there is any effect. > > > + priv->delay_line = PHY_SDCLKDL_DC_HS400; > > this delay line may need to be gotten from DT? There were only 3 different values used in the T-Head SDK so I am not sure a DT property is needed. The three values for the CLK delayline delay code (PHY_SDCLKDL_DC) are: PHY_SDCLKDL_DC_INITIAL 0x40 PHY_SDCLKDL_DC_DEFAULT 0x32 PHY_SDCLKDL_DC_HS400 0x18 PHY_SDCLKDL_DC_INITIAL is only used in th1520_phy_1_8v_init_no_pull() and th1520_phy_3_3v_init_no_pull(). Based on earlier discussion in this thread, I will be removing those functions in the next revision as they are unused. th1520_phy_1_8v_init() and th1520_phy_3_3v_init() both use dwcmshc_priv.delay_line to program the PHY_SDCLKDL_DC register. dwcmshc_probe() sets delay_line to PHY_SDCLKDL_DC_DEFAULT. If HS400 is used, then th1520_set_uhs_signaling() will change delay_line to PHY_SDCLKDL_DC_HS400. Based on the above, I don't think DT needs direct control of the delay_line value, but I can add a delay line DT prop if you prefer. > > > + th1520_sdhci_set_phy(host); > > + } else { > > + sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R); > > + } > > +} > > + > > static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc, > > struct mmc_ios *ios) > > { > > @@ -338,6 +659,91 @@ 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, PHY_ATDL_CNFG_INPSEL_VALUE << PHY_ATDL_CNFG_INPSEL_SHIFT, > > + 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_CI_SEL_SHIFT) | > > + (AT_CTRL_RPT_TUNE_ERR << AT_CTRL_RPT_TUNE_ERR_SHIFT) | > > + (AT_CTRL_SW_TUNE_EN << AT_CTRL_SW_TUNE_EN_SHIFT) | > > + (AT_CTRL_WIN_EDGE_SEL << AT_CTRL_WIN_EDGE_SEL_SHIFT)); > > + > > + /* > > + * 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_SWIN_TH_EN_SHIFT) | > > + (AT_CTRL_TUNE_CLK_STOP_EN << AT_CTRL_TUNE_CLK_STOP_EN_SHIFT) | > > + (AT_CTRL_PRE_CHANGE_DLY << AT_CTRL_PRE_CHANGE_DLY_SHIFT) | > > + (AT_CTRL_POST_CHANGE_DLY << AT_CTRL_POST_CHANGE_DLY_SHIFT) | > > + (AT_CTRL_SWIN_TH_VAL << AT_CTRL_SWIN_TH_VAL_SHIFT); > > + > > + sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > > + val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > > + > > + /* check if is possible to enable auto-tuning */ > > + if (!(val & AT_CTRL_AT_EN)) { > > + dev_err(mmc_dev(host->mmc), "failed to enable auto tuning\n"); > > + return -EIO; > > + } > > + > > + /* disable auto tuning */ > > + val &= ~AT_CTRL_AT_EN; > > + sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); > > AFAIK, the HW support auto tuning, can we enable it? I am not sure why the version of the driver in the T-Head SDK disables auto tuning. The AT_EN field in the AT_CTRL register is supposed to be enabled by default if the controller was designed to support Mode3 retuning. I am not sure if this is the case for this SoC. AT_EN is meant to be cleared when software wishes to disable Mode3 retuning which I believe is also known as Mode1. I suppose the best thing for me to do is experiement with AT_EN and see if I can in fact turn on auto-tuning. > > > + > > + /* perform tuning */ > > + sdhci_start_tuning(host); > > + host->tuning_err = __sdhci_execute_tuning(host, opcode); > > + if (host->tuning_err) { > > + val &= ~AT_CTRL_AT_EN; > > It looks like auto tunning is never enabled, so why do clear it here? I was confused by this also. I copied it from the T-Head SDK but I agree it doesn't seem to do anything useful. > > > + 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 +762,17 @@ 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 = th1520_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 +796,12 @@ 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 +870,10 @@ 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 +969,35 @@ 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; > > Ditto. There seems to only be two values used for the CLK delayline delay code, one for default and one for HS400. However, I could make it a dt property if you prefer. > > > + > > + if (device_property_present(&pdev->dev, "thead,phy-pull-up")) > > + priv->flags |= FLAG_PULL_UP_EN; > > + else > > + priv->flags &= ~FLAG_PULL_UP_EN; > > + > > + 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 ranther 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 > > Thank you for the review, Drew
diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c index 3a3bae6948a8..7294bf1afb7d 100644 --- a/drivers/mmc/host/sdhci-of-dwcmshc.c +++ b/drivers/mmc/host/sdhci-of-dwcmshc.c @@ -35,6 +35,26 @@ #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 0x1 /* autotuning is enabled */ +#define AT_CTRL_CI_SEL_SHIFT 0x1 /* bit 1 */ +#define AT_CTRL_CI_SEL 0x1 /* interval to drive center phase select */ +#define AT_CTRL_SWIN_TH_EN_SHIFT 0x2 /* bit 2 */ +#define AT_CTRL_SWIN_TH_EN 0x1 /* sampling window threshold enable */ +#define AT_CTRL_RPT_TUNE_ERR_SHIFT 0x3 /* bit 3 */ +#define AT_CTRL_RPT_TUNE_ERR 0x1 /* enable reporting framing errors */ +#define AT_CTRL_SW_TUNE_EN_SHIFT 0x4 /* bit 4 */ +#define AT_CTRL_SW_TUNE_EN 0x1 /* enable software managed tuning */ +#define AT_CTRL_WIN_EDGE_SEL_SHIFT 0x8 /* bits [11:8] */ +#define AT_CTRL_WIN_EDGE_SEL 0xf /* sampling window edge select */ +#define AT_CTRL_TUNE_CLK_STOP_EN_SHIFT 0x10 /* bit 16 */ +#define AT_CTRL_TUNE_CLK_STOP_EN 0x1 /* clocks stopped during phase code change */ +#define AT_CTRL_PRE_CHANGE_DLY_SHIFT 0x11 /* bits [18:17] */ +#define AT_CTRL_PRE_CHANGE_DLY 0x1 /* 2-cycle latency */ +#define AT_CTRL_POST_CHANGE_DLY_SHIFT 0x13 /* bits [20:19] */ +#define AT_CTRL_POST_CHANGE_DLY 0x3 /* 4-cycle latency */ +#define AT_CTRL_SWIN_TH_VAL_SHIFT 0x18 /* bits [31:24] */ +#define AT_CTRL_SWIN_TH_VAL 0x9 /* sampling window threshold */ /* Rockchip specific Registers */ #define DWCMSHC_EMMC_DLL_CTRL 0x800 @@ -72,6 +92,84 @@ (((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_SHIFT 0x10 /* bits [16:9] */ +#define PHY_CNFG_PAD_SP_VALUE 0x0c /* PMOS TX drive strength */ +#define PHY_CNFG_PAD_SN_SHIFT 0x14 /* bits [23:20] */ +#define PHY_CNFG_PAD_SN_VALUE 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_SHIFT 0x3 /* bits [4:3] */ +#define PHY_PAD_WEAKPULL_PULLUP 0x1 /* Weak pull down enabled */ +#define PHY_PAD_WEAKPULL_PULLDOWN 0x2 /* Weak pull down enabled */ + +#define PHY_PAD_TXSLEW_CTRL_P_SHIFT 0x5 /* bits [8:5] */ +#define PHY_PAD_TXSLEW_CTRL_P_VALUE 0x3 /* Slew control for P-Type pad TX */ +#define PHY_PAD_TXSLEW_CTRL_N_SHIFT 0x9 /* bits [12:9] */ +#define PHY_PAD_TXSLEW_CTRL_N_VALUE 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_SHIFT 0x4 /* bit 4 */ +#define PHY_SDCLKDL_CNFG_UPDATE_DC 0x1 /* 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_SHIFT 0x2 /* bits [3:2] */ +#define PHY_ATDL_CNFG_INPSEL_VALUE 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_SHIFT 0x4 /* bits [5:4] */ +#define PHY_DLL_CNFG1_SLVDLY_VALUE 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_SHIFT 0x5 /* bits [6:5] */ +#define PHY_DLLDL_CNFG_SLV_INPSEL_VALUE 0x3 /* clock source select for slave DL */ + +#define FLAG_PULL_UP_EN BIT(0) +#define FLAG_IO_FIXED_1V8 BIT(1) + #define BOUNDARY_OK(addr, len) \ ((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1))) @@ -92,6 +190,8 @@ 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 +257,206 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq) sdhci_request(mmc, mrq); } +static void th1520_phy_1_8v_init_no_pull(struct sdhci_host *host) +{ + u32 val; + + /* deassert phy reset */ + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT, PHY_CNFG_R); + + /* disable delay line */ + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, + PHY_SDCLKDL_CNFG_R); + + /* set delay line */ + sdhci_writeb(host, PHY_SDCLKDL_DC_INITIAL, PHY_SDCLKDL_DC_R); + + /* enable delay lane */ + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); + val &= ~(PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); + + /* configure phy pads */ + val = sdhci_readw(host, PHY_CMDPAD_CNFG_R); + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_CMDPAD_CNFG_R); + + val = sdhci_readw(host, PHY_DATAPAD_CNFG_R); + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_DATAPAD_CNFG_R); + + val = sdhci_readw(host, PHY_RSTNPAD_CNFG_R); + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_RSTNPAD_CNFG_R); + + val = sdhci_readw(host, PHY_STBPAD_CNFG_R); + sdhci_writew(host, val | PHY_PAD_RXSEL_1V8, PHY_STBPAD_CNFG_R); + + /* enable phy dll */ + val = sdhci_readb(host, PHY_DLL_CTRL_R); + sdhci_writeb(host, val | PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); +} + +static void th1520_phy_3_3v_init_no_pull(struct sdhci_host *host) +{ + u32 val; + + /* deassert phy reset */ + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT, PHY_CNFG_R); + + /* disable delay line */ + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, + PHY_SDCLKDL_CNFG_R); + + /* set delay line */ + sdhci_writeb(host, PHY_SDCLKDL_DC_INITIAL, PHY_SDCLKDL_DC_R); + + /* enable delay lane */ + val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R); + val &= ~(PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); + + /* configure phy pads */ + val = sdhci_readw(host, PHY_CMDPAD_CNFG_R); + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_CMDPAD_CNFG_R); + + val = sdhci_readw(host, PHY_DATAPAD_CNFG_R); + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_DATAPAD_CNFG_R); + + val = sdhci_readw(host, PHY_RSTNPAD_CNFG_R); + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_RSTNPAD_CNFG_R); + + val = sdhci_readw(host, PHY_STBPAD_CNFG_R); + sdhci_writew(host, val | PHY_PAD_RXSEL_3V3, PHY_STBPAD_CNFG_R); + + /* enable phy dll */ + val = sdhci_readb(host, PHY_DLL_CTRL_R); + sdhci_writeb(host, val | PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); +} + +static void th1520_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; + + if (!priv) + return; + + if (!(priv->flags & FLAG_PULL_UP_EN)) { + th1520_phy_1_8v_init_no_pull(host); + return; + } + + /* deassert phy reset & set tx drive strength */ + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT | + (PHY_CNFG_PAD_SP_VALUE << PHY_CNFG_PAD_SP_SHIFT) | + (PHY_CNFG_PAD_SN_VALUE << PHY_CNFG_PAD_SN_SHIFT), + PHY_CNFG_R); + + /* disable delay line */ + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, + 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_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); + + /* configure phy pads */ + val = PHY_PAD_RXSEL_1V8 | (PHY_PAD_WEAKPULL_PULLUP << PHY_PAD_WEAKPULL_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); + 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 = (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); + + val = PHY_PAD_RXSEL_1V8 | (PHY_PAD_WEAKPULL_PULLDOWN << PHY_PAD_WEAKPULL_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); + sdhci_writew(host, val, PHY_STBPAD_CNFG_R); + + /* enable data strobe mode */ + sdhci_writeb(host, PHY_DLLDL_CNFG_SLV_INPSEL_VALUE << PHY_DLLDL_CNFG_SLV_INPSEL_SHIFT, + PHY_DLLDL_CNFG_R); + + /* enable phy dll */ + sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R); +} + +static void th1520_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; + + if (!(priv->flags & FLAG_PULL_UP_EN)) { + th1520_phy_3_3v_init_no_pull(host); + return; + } + + /* deassert phy reset & set tx drive strength */ + sdhci_writel(host, PHY_CNFG_RSTN_DEASSERT | + (PHY_CNFG_PAD_SP_VALUE << PHY_CNFG_PAD_SP_SHIFT) | + (PHY_CNFG_PAD_SN_VALUE << PHY_CNFG_PAD_SN_SHIFT), + PHY_CNFG_R); + + /* disable delay line */ + sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT, + 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_DC << PHY_SDCLKDL_CNFG_UPDATE_SHIFT); + sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R); + + /* configure phy pads */ + val = PHY_PAD_RXSEL_3V3 | (PHY_PAD_WEAKPULL_PULLUP << PHY_PAD_WEAKPULL_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); + 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 = (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); + sdhci_writew(host, val, PHY_CLKPAD_CNFG_R); + + val = PHY_PAD_RXSEL_3V3 | (PHY_PAD_WEAKPULL_PULLDOWN << PHY_PAD_WEAKPULL_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_P_VALUE << PHY_PAD_TXSLEW_CTRL_P_SHIFT) | + (PHY_PAD_TXSLEW_CTRL_N_VALUE << PHY_PAD_TXSLEW_CTRL_N_SHIFT); + sdhci_writew(host, val, PHY_STBPAD_CNFG_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); + u16 emmc_ctrl; + + /* Before power on, set PHY configs */ + if (host->mmc->caps & MMC_CAP_NONREMOVABLE) { + th1520_phy_1_8v_init(host); + 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); + } else { + th1520_phy_3_3v_init(host); + } + + sdhci_writeb(host, (PHY_DLL_CNFG1_SLVDLY_VALUE << PHY_DLL_CNFG1_SLVDLY_SHIFT) | + PHY_DLL_CNFG1_WAITCYCLE, PHY_DLL_CNFG1_R); +} + static void dwcmshc_set_uhs_signaling(struct sdhci_host *host, unsigned int timing) { @@ -189,9 +489,30 @@ 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); + u32 reg; + + dwcmshc_set_uhs_signaling(host, timing); + if (timing == MMC_TIMING_MMC_HS400) { + reg = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); + reg &= ~AT_CTRL_AT_EN; + sdhci_writel(host, reg, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); + priv->delay_line = PHY_SDCLKDL_DC_HS400; + th1520_sdhci_set_phy(host); + } else { + sdhci_writeb(host, 0, PHY_DLLDL_CNFG_R); + } +} + static void dwcmshc_hs400_enhanced_strobe(struct mmc_host *mmc, struct mmc_ios *ios) { @@ -338,6 +659,91 @@ 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, PHY_ATDL_CNFG_INPSEL_VALUE << PHY_ATDL_CNFG_INPSEL_SHIFT, + 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_CI_SEL_SHIFT) | + (AT_CTRL_RPT_TUNE_ERR << AT_CTRL_RPT_TUNE_ERR_SHIFT) | + (AT_CTRL_SW_TUNE_EN << AT_CTRL_SW_TUNE_EN_SHIFT) | + (AT_CTRL_WIN_EDGE_SEL << AT_CTRL_WIN_EDGE_SEL_SHIFT)); + + /* + * 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_SWIN_TH_EN_SHIFT) | + (AT_CTRL_TUNE_CLK_STOP_EN << AT_CTRL_TUNE_CLK_STOP_EN_SHIFT) | + (AT_CTRL_PRE_CHANGE_DLY << AT_CTRL_PRE_CHANGE_DLY_SHIFT) | + (AT_CTRL_POST_CHANGE_DLY << AT_CTRL_POST_CHANGE_DLY_SHIFT) | + (AT_CTRL_SWIN_TH_VAL << AT_CTRL_SWIN_TH_VAL_SHIFT); + + sdhci_writel(host, val, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); + val = sdhci_readl(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_ATCTRL); + + /* check if is possible to enable auto-tuning */ + if (!(val & AT_CTRL_AT_EN)) { + dev_err(mmc_dev(host->mmc), "failed to enable auto tuning\n"); + return -EIO; + } + + /* disable auto tuning */ + val &= ~AT_CTRL_AT_EN; + sdhci_writel(host, val, 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) { + 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 +762,17 @@ 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 = th1520_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 +796,12 @@ 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 +870,10 @@ 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 +969,35 @@ 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_present(&pdev->dev, "thead,phy-pull-up")) + priv->flags |= FLAG_PULL_UP_EN; + else + priv->flags &= ~FLAG_PULL_UP_EN; + + 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 ranther 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);
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. Signed-off-by: Drew Fustini <dfustini@baylibre.com> --- drivers/mmc/host/sdhci-of-dwcmshc.c | 456 ++++++++++++++++++++++++++++++++++++ 1 file changed, 456 insertions(+)