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Subject[PATCH 06/24] iommu/mediatek: Add a flag DCM_DISABLE
Date
In the infra iommu, we should disable DCM. add a new flag for this.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
drivers/iommu/mtk_iommu.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 78b35e187c78..a026e2ee4007 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -53,6 +53,8 @@
#define F_MMU_STANDARD_AXI_MODE_MASK (BIT(3) | BIT(19))

#define REG_MMU_DCM_DIS 0x050
+#define F_MMU_DCM BIT(8)
+
#define REG_MMU_WR_LEN_CTRL 0x054
#define F_MMU_WR_THROT_DIS_MASK (BIT(5) | BIT(21))

@@ -121,6 +123,7 @@
#define HAS_LEGACY_IVRP_PADDR BIT(7)
#define IOVA_34_EN BIT(8)
#define SHARE_PGTABLE BIT(9) /* 2 HW share pgtable */
+#define DCM_DISABLE BIT(10)

#define MTK_IOMMU_HAS_FLAG(pdata, _x) \
((((pdata)->flags) & (_x)) == (_x))
@@ -738,7 +741,11 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
regval = F_MMU_VLD_PA_RNG(7, 4);
writel_relaxed(regval, data->base + REG_MMU_VLD_PA_RNG);
}
- writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
+ if (MTK_IOMMU_HAS_FLAG(data->plat_data, DCM_DISABLE))
+ writel_relaxed(F_MMU_DCM, data->base + REG_MMU_DCM_DIS);
+ else
+ writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
+
if (MTK_IOMMU_HAS_FLAG(data->plat_data, WR_THROT_EN)) {
/* write command throttling mode */
regval = readl_relaxed(data->base + REG_MMU_WR_LEN_CTRL);
--
2.18.0
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