On Fri, 2020-07-03 at 12:41 +0800, 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.
>
> Cc: Yong Wu <yong.wu@xxxxxxxxxxxx>
> 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 | 28 +++++++++++++++++-----------
> drivers/iommu/mtk_iommu.h | 7 +------
> 2 files changed, 18 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 88d3df5b91c2..40ca564d97af 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -100,6 +100,15 @@
> #define MTK_M4U_TO_LARB(id) (((id) >> 5) & 0xf)
> #define MTK_M4U_TO_PORT(id) ((id) & 0x1f)
>
> +#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_domain {
> struct io_pgtable_cfg cfg;
> struct io_pgtable_ops *iop;
> @@ -563,7 +572,8 @@ 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 +583,7 @@ 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 +628,7 @@ 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 +641,7 @@ 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 +773,19 @@ 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 7212e6fcf982..5225a9170aaa 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -39,12 +39,7 @@ 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;
How about using bit field instead? eg
u32 has_bclk:1;
In this way, we don't need to change code.
Joe.C
