linux-kernel - [PATCH v2 6/7] iommu/exynos: Add SysMMU v7 register sets

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Message-Id: <20220710230603.13526-7-semen.protsenko@linaro.org>
Date:   Mon, 11 Jul 2022 02:06:02 +0300
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Janghyuck Kim <janghyuck.kim@...sung.com>,
        Cho KyongHo <pullip.cho@...sung.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        David Virag <virag.david003@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 6/7] iommu/exynos: Add SysMMU v7 register sets

SysMMU v7 might have different register layouts (VM capable or non-VM
capable). Check which layout is implemented in current SysMMU module and
prepare the corresponding register table for futher usage.

Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
---
Changes in v2:
  - (none) This patch is new and added in v2

 drivers/iommu/exynos-iommu.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 48681189ccf8..64bf3331064f 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -166,6 +166,8 @@ static u32 lv2ent_offset(sysmmu_iova_t iova)
 enum {
 	REG_SET_V1,
 	REG_SET_V5,
+	REG_SET_V7_NON_VM,
+	REG_SET_V7_VM,
 	MAX_REG_SET
 };
 
@@ -201,6 +203,16 @@ static const unsigned int sysmmu_regs[MAX_REG_SET][MAX_REG_IDX] = {
 		0x00, 0x04, 0x08, 0x0c, 0x10, 0x14, 0x18, 0x20, 0x24,
 		0x60, 0x64,
 	},
+	/* SysMMU v7: Default register set (non-VM) */
+	{
+		0x00, 0x04, 0x08, 0x0c, 0x10, 0x14, 0x18, 0x20, 0x24,
+		0x60, 0x64,
+	},
+	/* SysMMU v7: VM capable register set */
+	{
+		0x00, 0x04, 0x08, 0x800c, 0x8010, 0x8014, 0x8018, 0x8020,
+		0x8024, 0x60, 0x64,
+	},
 };
 
 static struct device *dma_dev;
@@ -440,12 +452,18 @@ static void sysmmu_get_hw_info(struct sysmmu_drvdata *data)
 	__sysmmu_enable_clocks(data);
 
 	__sysmmu_get_version(data);
-	if (MMU_MAJ_VER(data->version) >= 7 && __sysmmu_has_capa1(data))
-		__sysmmu_get_vcr(data);
-	if (MMU_MAJ_VER(data->version) < 5)
+	if (MMU_MAJ_VER(data->version) < 5) {
 		data->regs = sysmmu_regs[REG_SET_V1];
-	else
+	} else if (MMU_MAJ_VER(data->version) < 7) {
 		data->regs = sysmmu_regs[REG_SET_V5];
+	} else {
+		if (__sysmmu_has_capa1(data))
+			__sysmmu_get_vcr(data);
+		if (data->has_vcr)
+			data->regs = sysmmu_regs[REG_SET_V7_VM];
+		else
+			data->regs = sysmmu_regs[REG_SET_V7_NON_VM];
+	}
 
 	__sysmmu_disable_clocks(data);
 }
-- 
2.30.2