Re: [PATCH v13 11/15] mmc: sdhci-cadence: Enable device specific override of writel()

[Ulf Hansson <ulf.hansson@xxxxxxxxxx>]

On Mon, 10 Apr 2023 at 20:47, Brad Larson <blarson@xxxxxxx> wrote:
>
> SoCs with device specific Cadence implementation, such as setting
> byte-enables before the write, need to override writel().  Add a
> callback where the default is writel() for all existing chips.
>
> Signed-off-by: Brad Larson <blarson@xxxxxxx>
> Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>

Applied for next, thanks!

Kind regards
Uffe


> ---
>
> v10 changes:
> - The 1st patch adding private writel() is unchanged.  The 2nd patch is split
>   into two patches to provide for device specific init in one patch with no
>   effect on existing designs.  Then add the pensando support into the next patch.
>   Then the 4th patch is mmc hardware reset support which is unchanged.
>
> v9 changes:
> - No change to this patch but as some patches are deleted and this is
>   a respin the three successive patches to sdhci-cadence.c are
>   patches 12, 13, and 14 which do the following:
>
>   1. Add ability for Cadence specific design to have priv writel().
>   2. Add Elba SoC support that requires its own priv writel() for
>      byte-lane control .
>   3. Add support for mmc hardware reset.
>
> ---
>  drivers/mmc/host/sdhci-cadence.c | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-cadence.c b/drivers/mmc/host/sdhci-cadence.c
> index 6f2de54a5987..708d4297f241 100644
> --- a/drivers/mmc/host/sdhci-cadence.c
> +++ b/drivers/mmc/host/sdhci-cadence.c
> @@ -67,6 +67,7 @@ struct sdhci_cdns_phy_param {
>  struct sdhci_cdns_priv {
>         void __iomem *hrs_addr;
>         bool enhanced_strobe;
> +       void (*priv_writel)(struct sdhci_cdns_priv *priv, u32 val, void __iomem *reg);
>         unsigned int nr_phy_params;
>         struct sdhci_cdns_phy_param phy_params[];
>  };
> @@ -90,6 +91,12 @@ static const struct sdhci_cdns_phy_cfg sdhci_cdns_phy_cfgs[] = {
>         { "cdns,phy-dll-delay-strobe", SDHCI_CDNS_PHY_DLY_STROBE, },
>  };
>
> +static inline void cdns_writel(struct sdhci_cdns_priv *priv, u32 val,
> +                              void __iomem *reg)
> +{
> +       writel(val, reg);
> +}
> +
>  static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
>                                     u8 addr, u8 data)
>  {
> @@ -104,17 +111,17 @@ static int sdhci_cdns_write_phy_reg(struct sdhci_cdns_priv *priv,
>
>         tmp = FIELD_PREP(SDHCI_CDNS_HRS04_WDATA, data) |
>               FIELD_PREP(SDHCI_CDNS_HRS04_ADDR, addr);
> -       writel(tmp, reg);
> +       priv->priv_writel(priv, tmp, reg);
>
>         tmp |= SDHCI_CDNS_HRS04_WR;
> -       writel(tmp, reg);
> +       priv->priv_writel(priv, tmp, reg);
>
>         ret = readl_poll_timeout(reg, tmp, tmp & SDHCI_CDNS_HRS04_ACK, 0, 10);
>         if (ret)
>                 return ret;
>
>         tmp &= ~SDHCI_CDNS_HRS04_WR;
> -       writel(tmp, reg);
> +       priv->priv_writel(priv, tmp, reg);
>
>         ret = readl_poll_timeout(reg, tmp, !(tmp & SDHCI_CDNS_HRS04_ACK),
>                                  0, 10);
> @@ -191,7 +198,7 @@ static void sdhci_cdns_set_emmc_mode(struct sdhci_cdns_priv *priv, u32 mode)
>         tmp = readl(priv->hrs_addr + SDHCI_CDNS_HRS06);
>         tmp &= ~SDHCI_CDNS_HRS06_MODE;
>         tmp |= FIELD_PREP(SDHCI_CDNS_HRS06_MODE, mode);
> -       writel(tmp, priv->hrs_addr + SDHCI_CDNS_HRS06);
> +       priv->priv_writel(priv, tmp, priv->hrs_addr + SDHCI_CDNS_HRS06);
>  }
>
>  static u32 sdhci_cdns_get_emmc_mode(struct sdhci_cdns_priv *priv)
> @@ -223,7 +230,7 @@ static int sdhci_cdns_set_tune_val(struct sdhci_host *host, unsigned int val)
>          */
>         for (i = 0; i < 2; i++) {
>                 tmp |= SDHCI_CDNS_HRS06_TUNE_UP;
> -               writel(tmp, reg);
> +               priv->priv_writel(priv, tmp, reg);
>
>                 ret = readl_poll_timeout(reg, tmp,
>                                          !(tmp & SDHCI_CDNS_HRS06_TUNE_UP),
> @@ -386,6 +393,7 @@ static int sdhci_cdns_probe(struct platform_device *pdev)
>         priv->nr_phy_params = nr_phy_params;
>         priv->hrs_addr = host->ioaddr;
>         priv->enhanced_strobe = false;
> +       priv->priv_writel = cdns_writel;
>         host->ioaddr += SDHCI_CDNS_SRS_BASE;
>         host->mmc_host_ops.hs400_enhanced_strobe =
>                                 sdhci_cdns_hs400_enhanced_strobe;
> --
> 2.17.1
>