linux-kernel - [PATCH v4 11/35] iommu/mediatek: Add a flag DCM

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Date:   Tue, 25 Jan 2022 16:56:10 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>, Rob Herring <robh+dt@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>
CC:     Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Tomasz Figa <tfiga@...omium.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, <anan.sun@...iatek.com>,
        <xueqi.zhang@...iatek.com>, <yen-chang.chen@...iatek.com>,
        "AngeloGioacchino Del Regno" 
        <angelogioacchino.delregno@...labora.com>,
        <mingyuan.ma@...iatek.com>, <yf.wang@...iatek.com>,
        <libo.kang@...iatek.com>, <chengci.xu@...iatek.com>
Subject: [PATCH v4 11/35] iommu/mediatek: Add a flag DCM_DISABLE

In the infra iommu, we should disable DCM. add a new flag for this.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.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 4a24977274e3..b2361e8b06d9 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -51,6 +51,8 @@
 #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))
 
@@ -119,6 +121,7 @@
 #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))
@@ -733,7 +736,11 @@ 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