Re: [PATCH v5 03/10] iommu/mediatek: Modify the usage of mtk_iommu_plat_data structure

[Matthias Brugger]

On 29/06/2020 09:13, Chao Hao wrote:
> Given the fact that we are adding more and more plat_data bool values,
> it would make sense to use a u32 flags register and add the appropriate
> macro definitions to set and check for a flag present.
> No functional change.
> 
> Suggested-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
> Signed-off-by: Chao Hao <chao.hao@xxxxxxxxxxxx>

Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>

> ---
>  drivers/iommu/mtk_iommu.c | 23 ++++++++++++-----------
>  drivers/iommu/mtk_iommu.h | 16 ++++++++++------
>  2 files changed, 22 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 88d3df5b91c2..8f81df6cbe51 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -563,7 +563,8 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  			 upper_32_bits(data->protect_base);
>  	writel_relaxed(regval, data->base + REG_MMU_IVRP_PADDR);
>  
> -	if (data->enable_4GB && data->plat_data->has_vld_pa_rng) {
> +	if (data->enable_4GB &&
> +	    MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_VLD_PA_RNG)) {
>  		/*
>  		 * If 4GB mode is enabled, the validate PA range is from
>  		 * 0x1_0000_0000 to 0x1_ffff_ffff. here record bit[32:30].
> @@ -573,7 +574,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
>  	}
>  	writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
>  
> -	if (data->plat_data->reset_axi) {
> +	if (MTK_IOMMU_HAS_FLAG(data->plat_data, RESET_AXI)) {
>  		/* The register is called STANDARD_AXI_MODE in this case */
>  		writel_relaxed(0, data->base + REG_MMU_MISC_CTRL);
>  	}
> @@ -618,7 +619,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
>  
>  	/* Whether the current dram is over 4GB */
>  	data->enable_4GB = !!(max_pfn > (BIT_ULL(32) >> PAGE_SHIFT));
> -	if (!data->plat_data->has_4gb_mode)
> +	if (!MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE))
>  		data->enable_4GB = false;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -631,7 +632,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
>  	if (data->irq < 0)
>  		return data->irq;
>  
> -	if (data->plat_data->has_bclk) {
> +	if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_BCLK)) {
>  		data->bclk = devm_clk_get(dev, "bclk");
>  		if (IS_ERR(data->bclk))
>  			return PTR_ERR(data->bclk);
> @@ -763,23 +764,23 @@ static const struct dev_pm_ops mtk_iommu_pm_ops = {
>  
>  static const struct mtk_iommu_plat_data mt2712_data = {
>  	.m4u_plat     = M4U_MT2712,
> -	.has_4gb_mode = true,
> -	.has_bclk     = true,
> -	.has_vld_pa_rng   = true,
> +	.flags        = HAS_4GB_MODE |
> +			HAS_BCLK |
> +			HAS_VLD_PA_RNG,
>  	.larbid_remap = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9},
>  };
>  
>  static const struct mtk_iommu_plat_data mt8173_data = {
>  	.m4u_plat     = M4U_MT8173,
> -	.has_4gb_mode = true,
> -	.has_bclk     = true,
> -	.reset_axi    = true,
> +	.flags	      = HAS_4GB_MODE |
> +			HAS_BCLK |
> +			RESET_AXI,
>  	.larbid_remap = {0, 1, 2, 3, 4, 5}, /* Linear mapping. */
>  };
>  
>  static const struct mtk_iommu_plat_data mt8183_data = {
>  	.m4u_plat     = M4U_MT8183,
> -	.reset_axi    = true,
> +	.flags        = RESET_AXI,
>  	.larbid_remap = {0, 4, 5, 6, 7, 2, 3, 1},
>  };
>  
> diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
> index 1b6ea839b92c..7cc39f729263 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -17,6 +17,15 @@
>  #include <linux/spinlock.h>
>  #include <soc/mediatek/smi.h>
>  
> +#define HAS_4GB_MODE			BIT(0)
> +/* HW will use the EMI clock if there isn't the "bclk". */
> +#define HAS_BCLK			BIT(1)
> +#define HAS_VLD_PA_RNG			BIT(2)
> +#define RESET_AXI			BIT(3)
> +
> +#define MTK_IOMMU_HAS_FLAG(pdata, _x) \
> +		((((pdata)->flags) & (_x)) == (_x))
> +
>  struct mtk_iommu_suspend_reg {
>  	u32				misc_ctrl;
>  	u32				dcm_dis;
> @@ -36,12 +45,7 @@ enum mtk_iommu_plat {
>  
>  struct mtk_iommu_plat_data {
>  	enum mtk_iommu_plat m4u_plat;
> -	bool                has_4gb_mode;
> -
> -	/* HW will use the EMI clock if there isn't the "bclk". */
> -	bool                has_bclk;
> -	bool                has_vld_pa_rng;
> -	bool                reset_axi;
> +	u32                 flags;
>  	unsigned char       larbid_remap[MTK_LARB_NR_MAX];
>  };
>  
>