[PATCH v2 3/7] mmc: sdhci-of-dwcmshc: Add support for T-Head TH1520
Drew Fustini
dfustini at baylibre.com
Wed Oct 18 11:27:26 PDT 2023
On Wed, Oct 18, 2023 at 11:46:19PM +0800, Jisheng Zhang wrote:
> On Tue, Oct 17, 2023 at 01:43:49PM -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 at baylibre.com>
> > ---
> > drivers/mmc/host/sdhci-of-dwcmshc.c | 358 ++++++++++++++++++++++++++++++++++++
> > 1 file changed, 358 insertions(+)
> >
> > diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
> > index 3a3bae6948a8..88ed0937c4e9 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 down 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 +251,129 @@ static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq)
> > sdhci_request(mmc, mrq);
> > }
> >
> > +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;
>
> this is impossible, can be removed.
Thanks, will do.
>
> > +
> > + /* 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 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;
> > +
> > + /* 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);
> > + u16 emmc_ctrl;
> > +
> > + /* Before power on, set PHY configs */
> > + if (priv->flags & FLAG_IO_FIXED_1V8)
> > + th1520_phy_1_8v_init(host);
> > + else
> > + th1520_phy_3_3v_init(host);
> > +
> > + if (host->mmc->caps & MMC_CAP_NONREMOVABLE) {
>
> Hi Drew,
>
> IMHO, this doesn't work for sdio. Normally, for a sdio wifi,
> "non-removable" is set, then the EMMC bit will be set below unexpectedly.
> So I suggested trying cap2 & (MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO)
> and reflect this fact in the dt-binding, I.E if this host is for emmc
> then no-sd and no-sdio is a must. I didn't see other
> solutions.
Thank you for explaining. I will change the code to test that instead.
>
> PS: can sd and sdio work with this patch?
After sending v2, I tried enabling the sdhci nodes. Initially, the
microSD card was not recognized. Then I realized I needed to change
th1520_set_uhs_signaling() so that it calls th1520_sdhci_set_phy()
for all devices and not just for MMC_TIMING_MMC_HS400.
With that change, the microSD card did appear as a block device and
I was able to mount the vfat partition that was on the card.
I did not try enabling sdio for the wifi module yet.
>
> Thanks
>
> > + 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 +406,26 @@ 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;
> > + 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 +572,85 @@ 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);
> > +
> > + /* check if is possible to enable auto-tuning */
>
> I'm not sure why do we need to check auto tuning is supported. Does this
> mean some of the sdhci hosts in th1520 don't support auto tuing while
> others support it?
I agree that this doesn't seem to make sense. This was logic I found in
the T-Head kernel. I've never seen that message print thus far during my
testing, so I think this if() block is probably unnecessary.
I just removed that if() block and I found that eMMC an microSD still
work okay. I will remove this in the next revision.
>
> > + if (!(val & AT_CTRL_AT_EN)) {
> > + dev_err(mmc_dev(host->mmc), "failed to enable auto tuning\n");
> > + return -EIO;
>
> FWICT, the controller can make use of sw tuning if AT isn't supported
> but I think that could be an improvement in the future. We can focuse on
> AT now.
Yes, I believe software controller tuning is an option, and I agree it
would be preferable to add that functionality later.
>
> > + }
> > +
> > + /* 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 +669,17 @@ 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 +703,12 @@ 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 +777,10 @@ 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 +876,30 @@ 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 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
> >
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