[RFC,4/4] mmc: renesas_sdhi: Add support for RZ/V2H(P) SoC

Commit Message

Prabhakar June 5, 2024, 7:49 a.m. UTC

From: Lad Prabhakar <[e-mail]>

The SDHI/eMMC IPs found in the RZ/V2H(P) (a.k.a. r9a09g057) are very
similar to those found in R-Car Gen3. However, they are not identical,
necessitating an SoC-specific compatible string for fine-tuning driver
support.

Key features of the RZ/V2H(P) SDHI/eMMC IPs include:
- Voltage level control via the IOVS bit.
- PWEN pin support via SD_STATUS register.
- Lack of HS400 support.
- Fixed address mode operation.

sd_iovs and sd_pwen quirks are introduced for SoCs supporting this bit
to handle voltage level control and power enable via SD_STATUS register.

regulator support is added to control the volatage levels of SD pins
via sd_iovs bit in SD_STATUS register.

Signed-off-by: Lad Prabhakar <[e-mail]>
---
 drivers/mmc/host/renesas_sdhi.h               |  7 ++
 drivers/mmc/host/renesas_sdhi_core.c          | 67 +++++++++++++++++--
 drivers/mmc/host/renesas_sdhi_internal_dmac.c | 45 +++++++++++++
 drivers/mmc/host/tmio_mmc.h                   |  4 ++
 4 files changed, 118 insertions(+), 5 deletions(-)

Comments

Biju Das June 6, 2024, 9:32 a.m. UTC | #1

Hi Prabhakar,

Thanks for the feedback.

> -----Original Message-----
> From: Prabhakar <[e-mail]>
> Sent: Wednesday, June 5, 2024 8:50 AM
> Subject: [RFC PATCH 4/4] mmc: renesas_sdhi: Add support for RZ/V2H(P) SoC
> 
> From: Lad Prabhakar <[e-mail]>
> 
> The SDHI/eMMC IPs found in the RZ/V2H(P) (a.k.a. r9a09g057) are very similar to those found in R-
> Car Gen3. However, they are not identical, necessitating an SoC-specific compatible string for
> fine-tuning driver support.
> 
> Key features of the RZ/V2H(P) SDHI/eMMC IPs include:
> - Voltage level control via the IOVS bit.
> - PWEN pin support via SD_STATUS register.
> - Lack of HS400 support.
> - Fixed address mode operation.
> 
> sd_iovs and sd_pwen quirks are introduced for SoCs supporting this bit to handle voltage level
> control and power enable via SD_STATUS register.
> 
> regulator support is added to control the volatage levels of SD pins via sd_iovs bit in SD_STATUS
> register.
> 
> Signed-off-by: Lad Prabhakar <[e-mail]>
> ---
>  drivers/mmc/host/renesas_sdhi.h               |  7 ++
>  drivers/mmc/host/renesas_sdhi_core.c          | 67 +++++++++++++++++--
>  drivers/mmc/host/renesas_sdhi_internal_dmac.c | 45 +++++++++++++
>  drivers/mmc/host/tmio_mmc.h                   |  4 ++
>  4 files changed, 118 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mmc/host/renesas_sdhi.h b/drivers/mmc/host/renesas_sdhi.h index
> 586f94d4dbfd..9ef4fdf44280 100644
> --- a/drivers/mmc/host/renesas_sdhi.h
> +++ b/drivers/mmc/host/renesas_sdhi.h
> @@ -11,6 +11,8 @@
> 
>  #include <linux/dmaengine.h>
>  #include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/driver.h>
>  #include "tmio_mmc.h"
> 
>  struct renesas_sdhi_scc {
> @@ -49,6 +51,11 @@ struct renesas_sdhi_quirks {
>  	bool manual_tap_correction;
>  	bool old_info1_layout;
>  	u32 hs400_bad_taps;
> +	bool sd_iovs;
> +	bool sd_pwen;
> +	struct regulator_desc *rdesc;
> +	const struct regmap_config *rdesc_regmap_config;
> +	unsigned int rdesc_offset;
>  	const u8 (*hs400_calib_table)[SDHI_CALIB_TABLE_MAX];
>  };
> 
> diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
> index 12f4faaaf4ee..2eeea9513a23 100644
> --- a/drivers/mmc/host/renesas_sdhi_core.c
> +++ b/drivers/mmc/host/renesas_sdhi_core.c
> @@ -248,6 +248,19 @@ static int renesas_sdhi_card_busy(struct mmc_host *mmc)
>  		 TMIO_STAT_DAT0);
>  }
> 
> +static void renesas_sdhi_sd_status_pwen(struct tmio_mmc_host *host,
> +bool on) {
> +	u32 sd_status;
> +
> +	sd_ctrl_read32_rep(host, CTL_SD_STATUS, &sd_status, 1);
> +	if (on)
> +		sd_status |=  SD_STATUS_PWEN;
> +	else
> +		sd_status &=  ~SD_STATUS_PWEN;
> +
> +	sd_ctrl_write32(host, CTL_SD_STATUS, sd_status); }
> +

May be use regulator_set_voltage() to set this??

>  static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
>  						    struct mmc_ios *ios)
>  {
> @@ -587,6 +600,9 @@ static void renesas_sdhi_reset(struct tmio_mmc_host *host, bool preserve)
>  					  false, priv->rstc);
>  			/* At least SDHI_VER_GEN2_SDR50 needs manual release of reset */
>  			sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
> +			if (sdhi_has_quirk(priv, sd_pwen))
> +				renesas_sdhi_sd_status_pwen(host, true);
> +
>  			priv->needs_adjust_hs400 = false;
>  			renesas_sdhi_set_clock(host, host->clk_cache);
> 
> @@ -904,6 +920,34 @@ static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
>  	renesas_sdhi_sdbuf_width(host, enable ? width : 16);  }
> 
> +static int renesas_sdhi_internal_dmac_register_regulator(struct platform_device *pdev,
> +							 const struct renesas_sdhi_quirks *quirks) {
> +	struct tmio_mmc_host *host = platform_get_drvdata(pdev);
> +	struct renesas_sdhi *priv = host_to_priv(host);
> +	struct regulator_config rcfg = {
> +		.dev = &pdev->dev,
> +		.driver_data = priv,
> +	};
> +	struct regulator_dev *rdev;
> +	const char *devname;
> +
> +	devname = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s-vqmmc-regulator",
> +				 dev_name(&pdev->dev));
> +	if (!devname)
> +		return -ENOMEM;
> +
> +	quirks->rdesc->name = devname;
> +	rcfg.regmap = devm_regmap_init_mmio(&pdev->dev, host->ctl + quirks->rdesc_offset,

This is (CTL_SD_STATUS << 2) , so the variable can be dropped from quirks.

Cheers,
Biju

> +					    quirks->rdesc_regmap_config);
> +	if (IS_ERR(rcfg.regmap))
> +		return PTR_ERR(rcfg.regmap);
> +
> +	rdev = devm_regulator_register(&pdev->dev, quirks->rdesc, &rcfg);
> +
> +	return PTR_ERR_OR_ZERO(rdev);
> +}
> +
>  int renesas_sdhi_probe(struct platform_device *pdev,
>  		       const struct tmio_mmc_dma_ops *dma_ops,
>  		       const struct renesas_sdhi_of_data *of_data, @@ -1051,6 +1095,15 @@ int
> renesas_sdhi_probe(struct platform_device *pdev,
>  	if (ret)
>  		goto efree;
> 
> +	if (sdhi_has_quirk(priv, sd_iovs)) {
> +		ret = renesas_sdhi_internal_dmac_register_regulator(pdev, quirks);
> +		if (ret)
> +			goto efree;
> +	}
> +
> +	if (sdhi_has_quirk(priv, sd_pwen))
> +		renesas_sdhi_sd_status_pwen(host, true);
> +
>  	ver = sd_ctrl_read16(host, CTL_VERSION);
>  	/* GEN2_SDR104 is first known SDHI to use 32bit block count */
>  	if (ver < SDHI_VER_GEN2_SDR104 && mmc_data->max_blk_count > U16_MAX) @@ -1110,26 +1163,26 @@
> int renesas_sdhi_probe(struct platform_device *pdev,
>  	num_irqs = platform_irq_count(pdev);
>  	if (num_irqs < 0) {
>  		ret = num_irqs;
> -		goto eirq;
> +		goto epwen;
>  	}
> 
>  	/* There must be at least one IRQ source */
>  	if (!num_irqs) {
>  		ret = -ENXIO;
> -		goto eirq;
> +		goto epwen;
>  	}
> 
>  	for (i = 0; i < num_irqs; i++) {
>  		irq = platform_get_irq(pdev, i);
>  		if (irq < 0) {
>  			ret = irq;
> -			goto eirq;
> +			goto epwen;
>  		}
> 
>  		ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
>  				       dev_name(&pdev->dev), host);
>  		if (ret)
> -			goto eirq;
> +			goto epwen;
>  	}
> 
>  	ret = tmio_mmc_host_probe(host);
> @@ -1141,7 +1194,9 @@ int renesas_sdhi_probe(struct platform_device *pdev,
> 
>  	return ret;
> 
> -eirq:
> +epwen:
> +	if (sdhi_has_quirk(priv, sd_pwen))
> +		renesas_sdhi_sd_status_pwen(host, false);
>  	tmio_mmc_host_remove(host);
>  edisclk:
>  	renesas_sdhi_clk_disable(host);
> @@ -1157,6 +1212,8 @@ void renesas_sdhi_remove(struct platform_device *pdev)
>  	struct tmio_mmc_host *host = platform_get_drvdata(pdev);
> 
>  	tmio_mmc_host_remove(host);
> +	if (sdhi_has_quirk(host_to_priv(host), sd_pwen))
> +		renesas_sdhi_sd_status_pwen(host, false);
>  	renesas_sdhi_clk_disable(host);
>  	tmio_mmc_host_free(host);
>  }
> diff --git a/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> index 422fa63a2e99..f824d167bb09 100644
> --- a/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> +++ b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
> @@ -215,6 +215,45 @@ static const struct renesas_sdhi_quirks sdhi_quirks_rzg2l = {
>  	.hs400_disabled = true,
>  };
> 
> +static const unsigned int r9a09g057_vqmmc_voltages[] = {
> +	3300000, 1800000,
> +};
> +
> +static const struct regulator_ops r9a09g057_regulator_voltage_ops = {
> +	.list_voltage = regulator_list_voltage_table,
> +	.map_voltage = regulator_map_voltage_descend,
> +	.get_voltage_sel = regulator_get_voltage_sel_regmap,
> +	.set_voltage_sel = regulator_set_voltage_sel_regmap, };
> +
> +static struct regulator_desc r9a09g057_vqmmc_regulator = {
> +	.of_match	= of_match_ptr("vqmmc-r9a09g057-regulator"),
> +	.owner		= THIS_MODULE,
> +	.type		= REGULATOR_VOLTAGE,
> +	.ops		= &r9a09g057_regulator_voltage_ops,
> +	.volt_table	= r9a09g057_vqmmc_voltages,
> +	.n_voltages	= ARRAY_SIZE(r9a09g057_vqmmc_voltages),
> +	.vsel_mask	= 0x10000,
> +	.vsel_reg	= 0,
> +};
> +
> +static const struct regmap_config r9a09g057_vqmmc_regmap_config = {
> +	.reg_bits	= 32,
> +	.val_bits	= 32,
> +	.reg_stride	= 4,
> +	.max_register	= 1,
> +};
> +
> +static const struct renesas_sdhi_quirks sdhi_quirks_r9a09g057 = {
> +	.fixed_addr_mode = true,
> +	.hs400_disabled = true,
> +	.sd_iovs = true,
> +	.sd_pwen = true,
> +	.rdesc = &r9a09g057_vqmmc_regulator,
> +	.rdesc_regmap_config = &r9a09g057_vqmmc_regmap_config,
> +	.rdesc_offset = 0x3C8,
> +};
> +
>  /*
>   * Note for r8a7796 / r8a774a1: we can't distinguish ES1.1 and 1.2 as of now.
>   * So, we want to treat them equally and only have a match for ES1.2 to enforce @@ -260,6 +299,11
> @@ static const struct renesas_sdhi_of_data_with_quirks of_rzg2l_compatible = {
>  	.quirks = &sdhi_quirks_rzg2l,
>  };
> 
> +static const struct renesas_sdhi_of_data_with_quirks of_r9a09g057_compatible = {
> +	.of_data = &of_data_rcar_gen3,
> +	.quirks = &sdhi_quirks_r9a09g057,
> +};
> +
>  static const struct renesas_sdhi_of_data_with_quirks of_rcar_gen3_compatible = {
>  	.of_data = &of_data_rcar_gen3,
>  };
> @@ -284,6 +328,7 @@ static const struct of_device_id renesas_sdhi_internal_dmac_of_match[] = {
>  	{ .compatible = "renesas,sdhi-r8a77990", .data = &of_r8a77990_compatible, },
>  	{ .compatible = "renesas,sdhi-r8a77995", .data = &of_rcar_gen3_nohs400_compatible, },
>  	{ .compatible = "renesas,sdhi-r9a09g011", .data = &of_rzg2l_compatible, },
> +	{ .compatible = "renesas,sdhi-r9a09g057", .data =
> +&of_r9a09g057_compatible, },
>  	{ .compatible = "renesas,rzg2l-sdhi", .data = &of_rzg2l_compatible, },
>  	{ .compatible = "renesas,rcar-gen3-sdhi", .data = &of_rcar_gen3_compatible, },
>  	{ .compatible = "renesas,rcar-gen4-sdhi", .data = &of_rcar_gen3_compatible, }, diff --git
> a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h index de56e6534aea..d03aedf61aa3 100644
> --- a/drivers/mmc/host/tmio_mmc.h
> +++ b/drivers/mmc/host/tmio_mmc.h
> @@ -43,6 +43,7 @@
>  #define CTL_RESET_SD 0xe0
>  #define CTL_VERSION 0xe2
>  #define CTL_SDIF_MODE 0xe6 /* only known on R-Car 2+ */
> +#define CTL_SD_STATUS 0xf2 /* only known on RZ/G2L and RZ/V2H(P) */
> 
>  /* Definitions for values the CTL_STOP_INTERNAL_ACTION register can take */
>  #define TMIO_STOP_STP		BIT(0)
> @@ -102,6 +103,9 @@
>  /* Definitions for values the CTL_SDIF_MODE register can take */
>  #define SDIF_MODE_HS400		BIT(0) /* only known on R-Car 2+ */
> 
> +/* Definitions for values the CTL_SD_STATUS register can take */
> +#define SD_STATUS_PWEN		BIT(0) /* only known on RZ/V2H(P) */
> +
>  /* Define some IRQ masks */
>  /* This is the mask used at reset by the chip */
>  #define TMIO_MASK_ALL           0x837f031d
> --
> 2.34.1

Prabhakar June 6, 2024, 9:38 a.m. UTC | #2

Hi Biju,

Thank you for the review.

On Thu, Jun 6, 2024 at 10:32 AM Biju Das <[e-mail]> wrote:
>
> Hi Prabhakar,
>
> Thanks for the feedback.
>
> > -----Original Message-----
> > From: Prabhakar <[e-mail]>
> > Sent: Wednesday, June 5, 2024 8:50 AM
> > Subject: [RFC PATCH 4/4] mmc: renesas_sdhi: Add support for RZ/V2H(P) SoC
> >
> > From: Lad Prabhakar <[e-mail]>
> >
> > The SDHI/eMMC IPs found in the RZ/V2H(P) (a.k.a. r9a09g057) are very similar to those found in R-
> > Car Gen3. However, they are not identical, necessitating an SoC-specific compatible string for
> > fine-tuning driver support.
> >
> > Key features of the RZ/V2H(P) SDHI/eMMC IPs include:
> > - Voltage level control via the IOVS bit.
> > - PWEN pin support via SD_STATUS register.
> > - Lack of HS400 support.
> > - Fixed address mode operation.
> >
> > sd_iovs and sd_pwen quirks are introduced for SoCs supporting this bit to handle voltage level
> > control and power enable via SD_STATUS register.
> >
> > regulator support is added to control the volatage levels of SD pins via sd_iovs bit in SD_STATUS
> > register.
> >
> > Signed-off-by: Lad Prabhakar <[e-mail]>
> > ---
> >  drivers/mmc/host/renesas_sdhi.h               |  7 ++
> >  drivers/mmc/host/renesas_sdhi_core.c          | 67 +++++++++++++++++--
> >  drivers/mmc/host/renesas_sdhi_internal_dmac.c | 45 +++++++++++++
> >  drivers/mmc/host/tmio_mmc.h                   |  4 ++
> >  4 files changed, 118 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/mmc/host/renesas_sdhi.h b/drivers/mmc/host/renesas_sdhi.h index
> > 586f94d4dbfd..9ef4fdf44280 100644
> > --- a/drivers/mmc/host/renesas_sdhi.h
> > +++ b/drivers/mmc/host/renesas_sdhi.h
> > @@ -11,6 +11,8 @@
> >
> >  #include <linux/dmaengine.h>
> >  #include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <linux/regulator/driver.h>
> >  #include "tmio_mmc.h"
> >
> >  struct renesas_sdhi_scc {
> > @@ -49,6 +51,11 @@ struct renesas_sdhi_quirks {
> >       bool manual_tap_correction;
> >       bool old_info1_layout;
> >       u32 hs400_bad_taps;
> > +     bool sd_iovs;
> > +     bool sd_pwen;
> > +     struct regulator_desc *rdesc;
> > +     const struct regmap_config *rdesc_regmap_config;
> > +     unsigned int rdesc_offset;
> >       const u8 (*hs400_calib_table)[SDHI_CALIB_TABLE_MAX];
> >  };
> >
> > diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
> > index 12f4faaaf4ee..2eeea9513a23 100644
> > --- a/drivers/mmc/host/renesas_sdhi_core.c
> > +++ b/drivers/mmc/host/renesas_sdhi_core.c
> > @@ -248,6 +248,19 @@ static int renesas_sdhi_card_busy(struct mmc_host *mmc)
> >                TMIO_STAT_DAT0);
> >  }
> >
> > +static void renesas_sdhi_sd_status_pwen(struct tmio_mmc_host *host,
> > +bool on) {
> > +     u32 sd_status;
> > +
> > +     sd_ctrl_read32_rep(host, CTL_SD_STATUS, &sd_status, 1);
> > +     if (on)
> > +             sd_status |=  SD_STATUS_PWEN;
> > +     else
> > +             sd_status &=  ~SD_STATUS_PWEN;
> > +
> > +     sd_ctrl_write32(host, CTL_SD_STATUS, sd_status); }
> > +
>
> May be use regulator_set_voltage() to set this??
>
This is the PWEN bit which is not modelled as a regulator, we cannot
use regulator_set_voltage() to set this bit.

> >  static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
> >                                                   struct mmc_ios *ios)
> >  {
> > @@ -587,6 +600,9 @@ static void renesas_sdhi_reset(struct tmio_mmc_host *host, bool preserve)
> >                                         false, priv->rstc);
> >                       /* At least SDHI_VER_GEN2_SDR50 needs manual release of reset */
> >                       sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
> > +                     if (sdhi_has_quirk(priv, sd_pwen))
> > +                             renesas_sdhi_sd_status_pwen(host, true);
> > +
> >                       priv->needs_adjust_hs400 = false;
> >                       renesas_sdhi_set_clock(host, host->clk_cache);
> >
> > @@ -904,6 +920,34 @@ static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
> >       renesas_sdhi_sdbuf_width(host, enable ? width : 16);  }
> >
> > +static int renesas_sdhi_internal_dmac_register_regulator(struct platform_device *pdev,
> > +                                                      const struct renesas_sdhi_quirks *quirks) {
> > +     struct tmio_mmc_host *host = platform_get_drvdata(pdev);
> > +     struct renesas_sdhi *priv = host_to_priv(host);
> > +     struct regulator_config rcfg = {
> > +             .dev = &pdev->dev,
> > +             .driver_data = priv,
> > +     };
> > +     struct regulator_dev *rdev;
> > +     const char *devname;
> > +
> > +     devname = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s-vqmmc-regulator",
> > +                              dev_name(&pdev->dev));
> > +     if (!devname)
> > +             return -ENOMEM;
> > +
> > +     quirks->rdesc->name = devname;
> > +     rcfg.regmap = devm_regmap_init_mmio(&pdev->dev, host->ctl + quirks->rdesc_offset,
>
> This is (CTL_SD_STATUS << 2) , so the variable can be dropped from quirks.
>
rdesc_offset is added to make code generic, that is in future if there
is a new chip with a different offset which supports IOVS we can just
pass the offset for it.

Cheers,
Prabhakar

Biju Das June 6, 2024, 9:43 a.m. UTC | #3

Hi Prabhakar,


> -----Original Message-----
> From: Lad, Prabhakar <[e-mail]>
> Sent: Thursday, June 6, 2024 10:38 AM
> Subject: Re: [RFC PATCH 4/4] mmc: renesas_sdhi: Add support for RZ/V2H(P) SoC
> 
> Hi Biju,
> 
> Thank you for the review.
> 
> On Thu, Jun 6, 2024 at 10:32 AM Biju Das <[e-mail]> wrote:
> >
> > Hi Prabhakar,
> >
> > Thanks for the feedback.
> >
> > > -----Original Message-----
> > > From: Prabhakar <[e-mail]>
> > > Sent: Wednesday, June 5, 2024 8:50 AM
> > > Subject: [RFC PATCH 4/4] mmc: renesas_sdhi: Add support for
> > > RZ/V2H(P) SoC
> > >
> > > From: Lad Prabhakar <[e-mail]>
> > >
> > > The SDHI/eMMC IPs found in the RZ/V2H(P) (a.k.a. r9a09g057) are very
> > > similar to those found in R- Car Gen3. However, they are not
> > > identical, necessitating an SoC-specific compatible string for fine-tuning driver support.
> > >
> > > Key features of the RZ/V2H(P) SDHI/eMMC IPs include:
> > > - Voltage level control via the IOVS bit.
> > > - PWEN pin support via SD_STATUS register.
> > > - Lack of HS400 support.
> > > - Fixed address mode operation.
> > >
> > > sd_iovs and sd_pwen quirks are introduced for SoCs supporting this
> > > bit to handle voltage level control and power enable via SD_STATUS register.
> > >
> > > regulator support is added to control the volatage levels of SD pins
> > > via sd_iovs bit in SD_STATUS register.
> > >
> > > Signed-off-by: Lad Prabhakar
> > > <[e-mail]>
> > > ---
> > >  drivers/mmc/host/renesas_sdhi.h               |  7 ++
> > >  drivers/mmc/host/renesas_sdhi_core.c          | 67 +++++++++++++++++--
> > >  drivers/mmc/host/renesas_sdhi_internal_dmac.c | 45 +++++++++++++
> > >  drivers/mmc/host/tmio_mmc.h                   |  4 ++
> > >  4 files changed, 118 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/drivers/mmc/host/renesas_sdhi.h
> > > b/drivers/mmc/host/renesas_sdhi.h index
> > > 586f94d4dbfd..9ef4fdf44280 100644
> > > --- a/drivers/mmc/host/renesas_sdhi.h
> > > +++ b/drivers/mmc/host/renesas_sdhi.h
> > > @@ -11,6 +11,8 @@
> > >
> > >  #include <linux/dmaengine.h>
> > >  #include <linux/platform_device.h>
> > > +#include <linux/regmap.h>
> > > +#include <linux/regulator/driver.h>
> > >  #include "tmio_mmc.h"
> > >
> > >  struct renesas_sdhi_scc {
> > > @@ -49,6 +51,11 @@ struct renesas_sdhi_quirks {
> > >       bool manual_tap_correction;
> > >       bool old_info1_layout;
> > >       u32 hs400_bad_taps;
> > > +     bool sd_iovs;
> > > +     bool sd_pwen;
> > > +     struct regulator_desc *rdesc;
> > > +     const struct regmap_config *rdesc_regmap_config;
> > > +     unsigned int rdesc_offset;
> > >       const u8 (*hs400_calib_table)[SDHI_CALIB_TABLE_MAX];
> > >  };
> > >
> > > diff --git a/drivers/mmc/host/renesas_sdhi_core.c
> > > b/drivers/mmc/host/renesas_sdhi_core.c
> > > index 12f4faaaf4ee..2eeea9513a23 100644
> > > --- a/drivers/mmc/host/renesas_sdhi_core.c
> > > +++ b/drivers/mmc/host/renesas_sdhi_core.c
> > > @@ -248,6 +248,19 @@ static int renesas_sdhi_card_busy(struct mmc_host *mmc)
> > >                TMIO_STAT_DAT0);
> > >  }
> > >
> > > +static void renesas_sdhi_sd_status_pwen(struct tmio_mmc_host *host,
> > > +bool on) {
> > > +     u32 sd_status;
> > > +
> > > +     sd_ctrl_read32_rep(host, CTL_SD_STATUS, &sd_status, 1);
> > > +     if (on)
> > > +             sd_status |=  SD_STATUS_PWEN;
> > > +     else
> > > +             sd_status &=  ~SD_STATUS_PWEN;
> > > +
> > > +     sd_ctrl_write32(host, CTL_SD_STATUS, sd_status); }
> > > +
> >
> > May be use regulator_set_voltage() to set this??
> >
> This is the PWEN bit which is not modelled as a regulator, we cannot use regulator_set_voltage() to
> set this bit.

So, there may be a race between regulator driver and this bit??

> 
> > >  static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
> > >                                                   struct mmc_ios
> > > *ios)  { @@ -587,6 +600,9 @@ static void renesas_sdhi_reset(struct
> > > tmio_mmc_host *host, bool preserve)
> > >                                         false, priv->rstc);
> > >                       /* At least SDHI_VER_GEN2_SDR50 needs manual release of reset */
> > >                       sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
> > > +                     if (sdhi_has_quirk(priv, sd_pwen))
> > > +                             renesas_sdhi_sd_status_pwen(host,
> > > + true);
> > > +
> > >                       priv->needs_adjust_hs400 = false;
> > >                       renesas_sdhi_set_clock(host, host->clk_cache);
> > >
> > > @@ -904,6 +920,34 @@ static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool
> enable)
> > >       renesas_sdhi_sdbuf_width(host, enable ? width : 16);  }
> > >
> > > +static int renesas_sdhi_internal_dmac_register_regulator(struct platform_device *pdev,
> > > +                                                      const struct renesas_sdhi_quirks
> *quirks) {
> > > +     struct tmio_mmc_host *host = platform_get_drvdata(pdev);
> > > +     struct renesas_sdhi *priv = host_to_priv(host);
> > > +     struct regulator_config rcfg = {
> > > +             .dev = &pdev->dev,
> > > +             .driver_data = priv,
> > > +     };
> > > +     struct regulator_dev *rdev;
> > > +     const char *devname;
> > > +
> > > +     devname = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s-vqmmc-regulator",
> > > +                              dev_name(&pdev->dev));
> > > +     if (!devname)
> > > +             return -ENOMEM;
> > > +
> > > +     quirks->rdesc->name = devname;
> > > +     rcfg.regmap = devm_regmap_init_mmio(&pdev->dev, host->ctl +
> > > + quirks->rdesc_offset,
> >
> > This is (CTL_SD_STATUS << 2) , so the variable can be dropped from quirks.
> >
> rdesc_offset is added to make code generic, that is in future if there is a new chip with a
> different offset which supports IOVS we can just pass the offset for it.

Currently there is no consumer for it, so it can save memory. When a future chip comes
we can bring back this variable??

Cheers,
Biju

Prabhakar June 6, 2024, 9:49 a.m. UTC | #4

Hi Biju,

On Thu, Jun 6, 2024 at 10:43 AM Biju Das <[e-mail]> wrote:
>
> Hi Prabhakar,
>
>
> > -----Original Message-----
> > From: Lad, Prabhakar <[e-mail]>
> > Sent: Thursday, June 6, 2024 10:38 AM
> > Subject: Re: [RFC PATCH 4/4] mmc: renesas_sdhi: Add support for RZ/V2H(P) SoC
> >
> > Hi Biju,
> >
> > Thank you for the review.
> >
> > On Thu, Jun 6, 2024 at 10:32 AM Biju Das <[e-mail]> wrote:
> > >
> > > Hi Prabhakar,
> > >
<snip>
> > > >
> > > > +static void renesas_sdhi_sd_status_pwen(struct tmio_mmc_host *host,
> > > > +bool on) {
> > > > +     u32 sd_status;
> > > > +
> > > > +     sd_ctrl_read32_rep(host, CTL_SD_STATUS, &sd_status, 1);
> > > > +     if (on)
> > > > +             sd_status |=  SD_STATUS_PWEN;
> > > > +     else
> > > > +             sd_status &=  ~SD_STATUS_PWEN;
> > > > +
> > > > +     sd_ctrl_write32(host, CTL_SD_STATUS, sd_status); }
> > > > +
> > >
> > > May be use regulator_set_voltage() to set this??
> > >
> > This is the PWEN bit which is not modelled as a regulator, we cannot use regulator_set_voltage() to
> > set this bit.
>
> So, there may be a race between regulator driver and this bit??
>
No, there won't be any race between the regulator driver and this bit
as the regulator driver only controls the IOVS bit and not the PWEN
bit.

> >
> > > >  static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
> > > >                                                   struct mmc_ios
> > > > *ios)  { @@ -587,6 +600,9 @@ static void renesas_sdhi_reset(struct
> > > > tmio_mmc_host *host, bool preserve)
> > > >                                         false, priv->rstc);
> > > >                       /* At least SDHI_VER_GEN2_SDR50 needs manual release of reset */
> > > >                       sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
> > > > +                     if (sdhi_has_quirk(priv, sd_pwen))
> > > > +                             renesas_sdhi_sd_status_pwen(host,
> > > > + true);
> > > > +
> > > >                       priv->needs_adjust_hs400 = false;
> > > >                       renesas_sdhi_set_clock(host, host->clk_cache);
> > > >
> > > > @@ -904,6 +920,34 @@ static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool
> > enable)
> > > >       renesas_sdhi_sdbuf_width(host, enable ? width : 16);  }
> > > >
> > > > +static int renesas_sdhi_internal_dmac_register_regulator(struct platform_device *pdev,
> > > > +                                                      const struct renesas_sdhi_quirks
> > *quirks) {
> > > > +     struct tmio_mmc_host *host = platform_get_drvdata(pdev);
> > > > +     struct renesas_sdhi *priv = host_to_priv(host);
> > > > +     struct regulator_config rcfg = {
> > > > +             .dev = &pdev->dev,
> > > > +             .driver_data = priv,
> > > > +     };
> > > > +     struct regulator_dev *rdev;
> > > > +     const char *devname;
> > > > +
> > > > +     devname = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s-vqmmc-regulator",
> > > > +                              dev_name(&pdev->dev));
> > > > +     if (!devname)
> > > > +             return -ENOMEM;
> > > > +
> > > > +     quirks->rdesc->name = devname;
> > > > +     rcfg.regmap = devm_regmap_init_mmio(&pdev->dev, host->ctl +
> > > > + quirks->rdesc_offset,
> > >
> > > This is (CTL_SD_STATUS << 2) , so the variable can be dropped from quirks.
> > >
> > rdesc_offset is added to make code generic, that is in future if there is a new chip with a
> > different offset which supports IOVS we can just pass the offset for it.
>
> Currently there is no consumer for it, so it can save memory. When a future chip comes
> we can bring back this variable??
>
OK.

Cheers,
Prabhakar

Biju Das June 6, 2024, 9:54 a.m. UTC | #5

> -----Original Message-----
> From: Lad, Prabhakar <[e-mail]>
> Sent: Thursday, June 6, 2024 10:50 AM
> To: Biju Das <[e-mail]>
> Cc: Geert Uytterhoeven <[e-mail]>; Ulf Hansson <[e-mail]>; Rob Herring
> <[e-mail]>; Krzysztof Kozlowski <[e-mail]>; Conor Dooley <[e-mail]>;
> Wolfram Sang <[e-mail]>; Liam Girdwood <[e-mail]>; Mark Brown
> <[e-mail]>; Magnus Damm <[e-mail]>; [e-mail];
> [e-mail]; [e-mail]; [e-mail];
> Fabrizio Castro <[e-mail]>; Prabhakar Mahadev Lad <prabhakar.mahadev-
> [e-mail]>
> Subject: Re: [RFC PATCH 4/4] mmc: renesas_sdhi: Add support for RZ/V2H(P) SoC
> 
> Hi Biju,
> 
> On Thu, Jun 6, 2024 at 10:43 AM Biju Das <[e-mail]> wrote:
> >
> > Hi Prabhakar,
> >
> >
> > > -----Original Message-----
> > > From: Lad, Prabhakar <[e-mail]>
> > > Sent: Thursday, June 6, 2024 10:38 AM
> > > Subject: Re: [RFC PATCH 4/4] mmc: renesas_sdhi: Add support for
> > > RZ/V2H(P) SoC
> > >
> > > Hi Biju,
> > >
> > > Thank you for the review.
> > >
> > > On Thu, Jun 6, 2024 at 10:32 AM Biju Das <[e-mail]> wrote:
> > > >
> > > > Hi Prabhakar,
> > > >
> <snip>
> > > > >
> > > > > +static void renesas_sdhi_sd_status_pwen(struct tmio_mmc_host
> > > > > +*host, bool on) {
> > > > > +     u32 sd_status;
> > > > > +
> > > > > +     sd_ctrl_read32_rep(host, CTL_SD_STATUS, &sd_status, 1);
> > > > > +     if (on)
> > > > > +             sd_status |=  SD_STATUS_PWEN;
> > > > > +     else
> > > > > +             sd_status &=  ~SD_STATUS_PWEN;
> > > > > +
> > > > > +     sd_ctrl_write32(host, CTL_SD_STATUS, sd_status); }
> > > > > +
> > > >
> > > > May be use regulator_set_voltage() to set this??
> > > >
> > > This is the PWEN bit which is not modelled as a regulator, we cannot
> > > use regulator_set_voltage() to set this bit.
> >
> > So, there may be a race between regulator driver and this bit??
> >
> No, there won't be any race between the regulator driver and this bit as the regulator driver only
> controls the IOVS bit and not the PWEN bit.

I guess, since it is rmw operation, there is a chance that this will overwritten in a race condition.
But mmc driver is manages the calls in serial fashion, so there won't be any races.

Cheers,
Biju

Wolfram Sang June 6, 2024, 10:08 a.m. UTC | #6

Hi Prabhakar,

thanks for this series!

On Wed, Jun 05, 2024 at 08:49:36AM +0100, Prabhakar wrote:
> From: Lad Prabhakar <[e-mail]>
> 
> The SDHI/eMMC IPs found in the RZ/V2H(P) (a.k.a. r9a09g057) are very
> similar to those found in R-Car Gen3. However, they are not identical,
> necessitating an SoC-specific compatible string for fine-tuning driver
> support.
> 
> Key features of the RZ/V2H(P) SDHI/eMMC IPs include:
> - Voltage level control via the IOVS bit.
> - PWEN pin support via SD_STATUS register.
> - Lack of HS400 support.
> - Fixed address mode operation.
> 
> sd_iovs and sd_pwen quirks are introduced for SoCs supporting this bit
> to handle voltage level control and power enable via SD_STATUS register.

Two high-level questions:

- can't we use .enable/.disable in regulator_ops for handling pwen?
  Then we could simply use regulator_en/disable in the code and be future
  proof when other SDHI instances have other kinds of regulators (unless
  I am mising something)

- what about not using regmap and use set/get_voltage and friends? My
  concern is that other "new" registers might appear in the future and
  it will be cumbersome to handle the scattered IO regions.

That said, having a regulator is not a quirk in my book. I'd think
'struct renesas_sdhi' is the proper place. Or?

Looking forward to your comments,

   Wolfram

Prabhakar June 6, 2024, 12:15 p.m. UTC | #7

Hi Wolfram,

On Thu, Jun 6, 2024 at 11:08 AM Wolfram Sang
<[e-mail]> wrote:
>
> Hi Prabhakar,
>
> thanks for this series!
>
> On Wed, Jun 05, 2024 at 08:49:36AM +0100, Prabhakar wrote:
> > From: Lad Prabhakar <[e-mail]>
> >
> > The SDHI/eMMC IPs found in the RZ/V2H(P) (a.k.a. r9a09g057) are very
> > similar to those found in R-Car Gen3. However, they are not identical,
> > necessitating an SoC-specific compatible string for fine-tuning driver
> > support.
> >
> > Key features of the RZ/V2H(P) SDHI/eMMC IPs include:
> > - Voltage level control via the IOVS bit.
> > - PWEN pin support via SD_STATUS register.
> > - Lack of HS400 support.
> > - Fixed address mode operation.
> >
> > sd_iovs and sd_pwen quirks are introduced for SoCs supporting this bit
> > to handle voltage level control and power enable via SD_STATUS register.
>
> Two high-level questions:
>
> - can't we use .enable/.disable in regulator_ops for handling pwen?
>   Then we could simply use regulator_en/disable in the code and be future
>   proof when other SDHI instances have other kinds of regulators (unless
>   I am mising something)
>
Ok let me check on this and get back.

> - what about not using regmap and use set/get_voltage and friends? My
>   concern is that other "new" registers might appear in the future and
>   it will be cumbersome to handle the scattered IO regions.
>
I'll have to do some reading on this. Can you please point me to any
example driver which does not use regmap.

> That said, having a regulator is not a quirk in my book. I'd think
> 'struct renesas_sdhi' is the proper place. Or?
>
Ok, I will move them out of quirks.

Cheers,
Prabhakar

Wolfram Sang June 6, 2024, 4:52 p.m. UTC | #8

Hi Prabhakar,

> > - can't we use .enable/.disable in regulator_ops for handling pwen?
> >   Then we could simply use regulator_en/disable in the code and be future
> >   proof when other SDHI instances have other kinds of regulators (unless
> >   I am mising something)
> >
> Ok let me check on this and get back.

Thanks!

> > - what about not using regmap and use set/get_voltage and friends? My
> >   concern is that other "new" registers might appear in the future and
> >   it will be cumbersome to handle the scattered IO regions.
> >
> I'll have to do some reading on this. Can you please point me to any
> example driver which does not use regmap.

Sure thing!

~/Kernel/linux/drivers/regulator$ grep -L regmap $(grep -l devm_regulator_register *.c)
aat2870-regulator.c
ab8500.c
ab8500-ext.c
ad5398.c
cros-ec-regulator.c
da903x-regulator.c
db8500-prcmu.c
dummy.c
fixed.c
gpio-regulator.c
isl6271a-regulator.c
lp3971.c
lp3972.c
max1586.c
max8660.c
max8925-regulator.c
max8952.c
max8997-regulator.c
max8998.c
mc13783-regulator.c
mc13892-regulator.c
mtk-dvfsrc-regulator.c
pcap-regulator.c
pwm-regulator.c
qcom-rpmh-regulator.c
qcom_rpm-regulator.c
qcom_smd-regulator.c
scmi-regulator.c
stm32-pwr.c
ti-abb-regulator.c
tps6507x-regulator.c
tps6524x-regulator.c
twl6030-regulator.c
twl-regulator.c
vctrl-regulator.c

> > That said, having a regulator is not a quirk in my book. I'd think
> > 'struct renesas_sdhi' is the proper place. Or?
> >
> Ok, I will move them out of quirks.

Cool!

Happy hacking,

   Wolfram

Patch

diff --git a/drivers/mmc/host/renesas_sdhi.h b/drivers/mmc/host/renesas_sdhi.h
index 586f94d4dbfd..9ef4fdf44280 100644
--- a/drivers/mmc/host/renesas_sdhi.h
+++ b/drivers/mmc/host/renesas_sdhi.h
@@ -11,6 +11,8 @@ 
 
 #include <linux/dmaengine.h>
 #include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/driver.h>
 #include "tmio_mmc.h"
 
 struct renesas_sdhi_scc {
@@ -49,6 +51,11 @@  struct renesas_sdhi_quirks {
 	bool manual_tap_correction;
 	bool old_info1_layout;
 	u32 hs400_bad_taps;
+	bool sd_iovs;
+	bool sd_pwen;
+	struct regulator_desc *rdesc;
+	const struct regmap_config *rdesc_regmap_config;
+	unsigned int rdesc_offset;
 	const u8 (*hs400_calib_table)[SDHI_CALIB_TABLE_MAX];
 };
 
diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
index 12f4faaaf4ee..2eeea9513a23 100644
--- a/drivers/mmc/host/renesas_sdhi_core.c
+++ b/drivers/mmc/host/renesas_sdhi_core.c
@@ -248,6 +248,19 @@  static int renesas_sdhi_card_busy(struct mmc_host *mmc)
 		 TMIO_STAT_DAT0);
 }
 
+static void renesas_sdhi_sd_status_pwen(struct tmio_mmc_host *host, bool on)
+{
+	u32 sd_status;
+
+	sd_ctrl_read32_rep(host, CTL_SD_STATUS, &sd_status, 1);
+	if (on)
+		sd_status |=  SD_STATUS_PWEN;
+	else
+		sd_status &=  ~SD_STATUS_PWEN;
+
+	sd_ctrl_write32(host, CTL_SD_STATUS, sd_status);
+}
+
 static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
 						    struct mmc_ios *ios)
 {
@@ -587,6 +600,9 @@  static void renesas_sdhi_reset(struct tmio_mmc_host *host, bool preserve)
 					  false, priv->rstc);
 			/* At least SDHI_VER_GEN2_SDR50 needs manual release of reset */
 			sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
+			if (sdhi_has_quirk(priv, sd_pwen))
+				renesas_sdhi_sd_status_pwen(host, true);
+
 			priv->needs_adjust_hs400 = false;
 			renesas_sdhi_set_clock(host, host->clk_cache);
 
@@ -904,6 +920,34 @@  static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
 	renesas_sdhi_sdbuf_width(host, enable ? width : 16);
 }
 
+static int renesas_sdhi_internal_dmac_register_regulator(struct platform_device *pdev,
+							 const struct renesas_sdhi_quirks *quirks)
+{
+	struct tmio_mmc_host *host = platform_get_drvdata(pdev);
+	struct renesas_sdhi *priv = host_to_priv(host);
+	struct regulator_config rcfg = {
+		.dev = &pdev->dev,
+		.driver_data = priv,
+	};
+	struct regulator_dev *rdev;
+	const char *devname;
+
+	devname = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s-vqmmc-regulator",
+				 dev_name(&pdev->dev));
+	if (!devname)
+		return -ENOMEM;
+
+	quirks->rdesc->name = devname;
+	rcfg.regmap = devm_regmap_init_mmio(&pdev->dev, host->ctl + quirks->rdesc_offset,
+					    quirks->rdesc_regmap_config);
+	if (IS_ERR(rcfg.regmap))
+		return PTR_ERR(rcfg.regmap);
+
+	rdev = devm_regulator_register(&pdev->dev, quirks->rdesc, &rcfg);
+
+	return PTR_ERR_OR_ZERO(rdev);
+}
+
 int renesas_sdhi_probe(struct platform_device *pdev,
 		       const struct tmio_mmc_dma_ops *dma_ops,
 		       const struct renesas_sdhi_of_data *of_data,
@@ -1051,6 +1095,15 @@  int renesas_sdhi_probe(struct platform_device *pdev,
 	if (ret)
 		goto efree;
 
+	if (sdhi_has_quirk(priv, sd_iovs)) {
+		ret = renesas_sdhi_internal_dmac_register_regulator(pdev, quirks);
+		if (ret)
+			goto efree;
+	}
+
+	if (sdhi_has_quirk(priv, sd_pwen))
+		renesas_sdhi_sd_status_pwen(host, true);
+
 	ver = sd_ctrl_read16(host, CTL_VERSION);
 	/* GEN2_SDR104 is first known SDHI to use 32bit block count */
 	if (ver < SDHI_VER_GEN2_SDR104 && mmc_data->max_blk_count > U16_MAX)
@@ -1110,26 +1163,26 @@  int renesas_sdhi_probe(struct platform_device *pdev,
 	num_irqs = platform_irq_count(pdev);
 	if (num_irqs < 0) {
 		ret = num_irqs;
-		goto eirq;
+		goto epwen;
 	}
 
 	/* There must be at least one IRQ source */
 	if (!num_irqs) {
 		ret = -ENXIO;
-		goto eirq;
+		goto epwen;
 	}
 
 	for (i = 0; i < num_irqs; i++) {
 		irq = platform_get_irq(pdev, i);
 		if (irq < 0) {
 			ret = irq;
-			goto eirq;
+			goto epwen;
 		}
 
 		ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
 				       dev_name(&pdev->dev), host);
 		if (ret)
-			goto eirq;
+			goto epwen;
 	}
 
 	ret = tmio_mmc_host_probe(host);
@@ -1141,7 +1194,9 @@  int renesas_sdhi_probe(struct platform_device *pdev,
 
 	return ret;
 
-eirq:
+epwen:
+	if (sdhi_has_quirk(priv, sd_pwen))
+		renesas_sdhi_sd_status_pwen(host, false);
 	tmio_mmc_host_remove(host);
 edisclk:
 	renesas_sdhi_clk_disable(host);
@@ -1157,6 +1212,8 @@  void renesas_sdhi_remove(struct platform_device *pdev)
 	struct tmio_mmc_host *host = platform_get_drvdata(pdev);
 
 	tmio_mmc_host_remove(host);
+	if (sdhi_has_quirk(host_to_priv(host), sd_pwen))
+		renesas_sdhi_sd_status_pwen(host, false);
 	renesas_sdhi_clk_disable(host);
 	tmio_mmc_host_free(host);
 }
diff --git a/drivers/mmc/host/renesas_sdhi_internal_dmac.c b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
index 422fa63a2e99..f824d167bb09 100644
--- a/drivers/mmc/host/renesas_sdhi_internal_dmac.c
+++ b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
@@ -215,6 +215,45 @@  static const struct renesas_sdhi_quirks sdhi_quirks_rzg2l = {
 	.hs400_disabled = true,
 };
 
+static const unsigned int r9a09g057_vqmmc_voltages[] = {
+	3300000, 1800000,
+};
+
+static const struct regulator_ops r9a09g057_regulator_voltage_ops = {
+	.list_voltage = regulator_list_voltage_table,
+	.map_voltage = regulator_map_voltage_descend,
+	.get_voltage_sel = regulator_get_voltage_sel_regmap,
+	.set_voltage_sel = regulator_set_voltage_sel_regmap,
+};
+
+static struct regulator_desc r9a09g057_vqmmc_regulator = {
+	.of_match	= of_match_ptr("vqmmc-r9a09g057-regulator"),
+	.owner		= THIS_MODULE,
+	.type		= REGULATOR_VOLTAGE,
+	.ops		= &r9a09g057_regulator_voltage_ops,
+	.volt_table	= r9a09g057_vqmmc_voltages,
+	.n_voltages	= ARRAY_SIZE(r9a09g057_vqmmc_voltages),
+	.vsel_mask	= 0x10000,
+	.vsel_reg	= 0,
+};
+
+static const struct regmap_config r9a09g057_vqmmc_regmap_config = {
+	.reg_bits	= 32,
+	.val_bits	= 32,
+	.reg_stride	= 4,
+	.max_register	= 1,
+};
+
+static const struct renesas_sdhi_quirks sdhi_quirks_r9a09g057 = {
+	.fixed_addr_mode = true,
+	.hs400_disabled = true,
+	.sd_iovs = true,
+	.sd_pwen = true,
+	.rdesc = &r9a09g057_vqmmc_regulator,
+	.rdesc_regmap_config = &r9a09g057_vqmmc_regmap_config,
+	.rdesc_offset = 0x3C8,
+};
+
 /*
  * Note for r8a7796 / r8a774a1: we can't distinguish ES1.1 and 1.2 as of now.
  * So, we want to treat them equally and only have a match for ES1.2 to enforce
@@ -260,6 +299,11 @@  static const struct renesas_sdhi_of_data_with_quirks of_rzg2l_compatible = {
 	.quirks = &sdhi_quirks_rzg2l,
 };
 
+static const struct renesas_sdhi_of_data_with_quirks of_r9a09g057_compatible = {
+	.of_data = &of_data_rcar_gen3,
+	.quirks = &sdhi_quirks_r9a09g057,
+};
+
 static const struct renesas_sdhi_of_data_with_quirks of_rcar_gen3_compatible = {
 	.of_data = &of_data_rcar_gen3,
 };
@@ -284,6 +328,7 @@  static const struct of_device_id renesas_sdhi_internal_dmac_of_match[] = {
 	{ .compatible = "renesas,sdhi-r8a77990", .data = &of_r8a77990_compatible, },
 	{ .compatible = "renesas,sdhi-r8a77995", .data = &of_rcar_gen3_nohs400_compatible, },
 	{ .compatible = "renesas,sdhi-r9a09g011", .data = &of_rzg2l_compatible, },
+	{ .compatible = "renesas,sdhi-r9a09g057", .data = &of_r9a09g057_compatible, },
 	{ .compatible = "renesas,rzg2l-sdhi", .data = &of_rzg2l_compatible, },
 	{ .compatible = "renesas,rcar-gen3-sdhi", .data = &of_rcar_gen3_compatible, },
 	{ .compatible = "renesas,rcar-gen4-sdhi", .data = &of_rcar_gen3_compatible, },
diff --git a/drivers/mmc/host/tmio_mmc.h b/drivers/mmc/host/tmio_mmc.h
index de56e6534aea..d03aedf61aa3 100644
--- a/drivers/mmc/host/tmio_mmc.h
+++ b/drivers/mmc/host/tmio_mmc.h
@@ -43,6 +43,7 @@ 
 #define CTL_RESET_SD 0xe0
 #define CTL_VERSION 0xe2
 #define CTL_SDIF_MODE 0xe6 /* only known on R-Car 2+ */
+#define CTL_SD_STATUS 0xf2 /* only known on RZ/G2L and RZ/V2H(P) */
 
 /* Definitions for values the CTL_STOP_INTERNAL_ACTION register can take */
 #define TMIO_STOP_STP		BIT(0)
@@ -102,6 +103,9 @@ 
 /* Definitions for values the CTL_SDIF_MODE register can take */
 #define SDIF_MODE_HS400		BIT(0) /* only known on R-Car 2+ */
 
+/* Definitions for values the CTL_SD_STATUS register can take */
+#define SD_STATUS_PWEN		BIT(0) /* only known on RZ/V2H(P) */
+
 /* Define some IRQ masks */
 /* This is the mask used at reset by the chip */
 #define TMIO_MASK_ALL           0x837f031d