[1/3] mmc: sunxi: Refactor mod clock register offset

So far the only difference between the various Allwinner MMC controller
we are concerned about is the mod clock register offset.
This is actually not directly related to the MMC controller IP, but an
integration choice, dependent on the SoC this appears in.

To avoid becoming trapped with some compatible fallback strings, let's
remove the whole struct sunxi_mmc_variant, and replace this with a SoC
based choice, which we can derive from the CONFIG_MACH_SUNx_y symbols.

This will later simplify H616 support.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
 drivers/mmc/sunxi_mmc.c | 84 +++++++++++------------------------------
 1 file changed, 23 insertions(+), 61 deletions(-)

On 1/11/21 10:03 AM, Andre Przywara wrote:
> So far the only difference between the various Allwinner MMC controller
> we are concerned about is the mod clock register offset.
> This is actually not directly related to the MMC controller IP, but an
> integration choice, dependent on the SoC this appears in.
> 
> To avoid becoming trapped with some compatible fallback strings, let's
> remove the whole struct sunxi_mmc_variant, and replace this with a SoC
> based choice, which we can derive from the CONFIG_MACH_SUNx_y symbols.
> 
> This will later simplify H616 support.
> 
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>

Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>

Best Regards,
Jaehoon Chung

> ---
>  drivers/mmc/sunxi_mmc.c | 84 +++++++++++------------------------------
>  1 file changed, 23 insertions(+), 61 deletions(-)
> 
> diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
> index 0e03b07ce55..bbdbbc7a373 100644
> --- a/drivers/mmc/sunxi_mmc.c
> +++ b/drivers/mmc/sunxi_mmc.c
> @@ -23,12 +23,6 @@
>  #include <asm-generic/gpio.h>
>  #include <linux/delay.h>
>  
> -#ifdef CONFIG_DM_MMC
> -struct sunxi_mmc_variant {
> -	u16 mclk_offset;
> -};
> -#endif
> -
>  struct sunxi_mmc_plat {
>  	struct mmc_config cfg;
>  	struct mmc mmc;
> @@ -42,9 +36,6 @@ struct sunxi_mmc_priv {
>  	int cd_inverted;		/* Inverted Card Detect */
>  	struct sunxi_mmc *reg;
>  	struct mmc_config cfg;
> -#ifdef CONFIG_DM_MMC
> -	const struct sunxi_mmc_variant *variant;
> -#endif
>  };
>  
>  #if !CONFIG_IS_ENABLED(DM_MMC)
> @@ -605,6 +596,17 @@ static const struct dm_mmc_ops sunxi_mmc_ops = {
>  	.get_cd		= sunxi_mmc_getcd,
>  };
>  
> +static unsigned get_mclk_offset(void)
> +{
> +	if (IS_ENABLED(CONFIG_MACH_SUN9I_A80))
> +		return 0x410;
> +
> +	if (IS_ENABLED(CONFIG_MACH_SUN50I_H6))
> +		return 0x830;
> +
> +	return 0x88;
> +};
> +
>  static int sunxi_mmc_probe(struct udevice *dev)
>  {
>  	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
> @@ -633,8 +635,6 @@ static int sunxi_mmc_probe(struct udevice *dev)
>  	cfg->f_max = 52000000;
>  
>  	priv->reg = (void *)dev_read_addr(dev);
> -	priv->variant =
> -		(const struct sunxi_mmc_variant *)dev_get_driver_data(dev);
>  
>  	/* We don't have a sunxi clock driver so find the clock address here */
>  	ret = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0,
> @@ -644,8 +644,7 @@ static int sunxi_mmc_probe(struct udevice *dev)
>  	ccu_reg = (u32 *)ofnode_get_addr(args.node);
>  
>  	priv->mmc_no = ((uintptr_t)priv->reg - SUNXI_MMC0_BASE) / 0x1000;
> -	priv->mclkreg = (void *)ccu_reg +
> -			(priv->variant->mclk_offset + (priv->mmc_no * 4));
> +	priv->mclkreg = (void *)ccu_reg + get_mclk_offset() + priv->mmc_no * 4;
>  
>  	ret = clk_get_by_name(dev, "ahb", &gate_clk);
>  	if (!ret)
> @@ -687,55 +686,18 @@ static int sunxi_mmc_bind(struct udevice *dev)
>  	return mmc_bind(dev, &plat->mmc, &plat->cfg);
>  }
>  
> -static const struct sunxi_mmc_variant sun4i_a10_variant = {
> -	.mclk_offset = 0x88,
> -};
> -
> -static const struct sunxi_mmc_variant sun9i_a80_variant = {
> -	.mclk_offset = 0x410,
> -};
> -
> -static const struct sunxi_mmc_variant sun50i_h6_variant = {
> -	.mclk_offset = 0x830,
> -};
> -
>  static const struct udevice_id sunxi_mmc_ids[] = {
> -	{
> -	  .compatible = "allwinner,sun4i-a10-mmc",
> -	  .data = (ulong)&sun4i_a10_variant,
> -	},
> -	{
> -	  .compatible = "allwinner,sun5i-a13-mmc",
> -	  .data = (ulong)&sun4i_a10_variant,
> -	},
> -	{
> -	  .compatible = "allwinner,sun7i-a20-mmc",
> -	  .data = (ulong)&sun4i_a10_variant,
> -	},
> -	{
> -	  .compatible = "allwinner,sun8i-a83t-emmc",
> -	  .data = (ulong)&sun4i_a10_variant,
> -	},
> -	{
> -	  .compatible = "allwinner,sun9i-a80-mmc",
> -	  .data = (ulong)&sun9i_a80_variant,
> -	},
> -	{
> -	  .compatible = "allwinner,sun50i-a64-mmc",
> -	  .data = (ulong)&sun4i_a10_variant,
> -	},
> -	{
> -	  .compatible = "allwinner,sun50i-a64-emmc",
> -	  .data = (ulong)&sun4i_a10_variant,
> -	},
> -	{
> -	  .compatible = "allwinner,sun50i-h6-mmc",
> -	  .data = (ulong)&sun50i_h6_variant,
> -	},
> -	{
> -	  .compatible = "allwinner,sun50i-h6-emmc",
> -	  .data = (ulong)&sun50i_h6_variant,
> -	},
> +	{ .compatible = "allwinner,sun4i-a10-mmc" },
> +	{ .compatible = "allwinner,sun5i-a13-mmc" },
> +	{ .compatible = "allwinner,sun7i-a20-mmc" },
> +	{ .compatible = "allwinner,sun8i-a83t-emmc" },
> +	{ .compatible = "allwinner,sun9i-a80-mmc" },
> +	{ .compatible = "allwinner,sun50i-a64-mmc" },
> +	{ .compatible = "allwinner,sun50i-a64-emmc" },
> +	{ .compatible = "allwinner,sun50i-h6-mmc" },
> +	{ .compatible = "allwinner,sun50i-h6-emmc" },
> +	{ .compatible = "allwinner,sun50i-a100-mmc" },
> +	{ .compatible = "allwinner,sun50i-a100-emmc" },
>  	{ /* sentinel */ }
>  };
>  
>