linux-kernel - [PATCH v6 02/22] iommu/mediatek: Use a struct as the platform data

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Date:   Sun, 17 Feb 2019 17:04:40 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>
CC:     Evan Green <evgreen@...omium.org>, Tomasz Figa <tfiga@...gle.com>,
        Will Deacon <will.deacon@....com>,
        <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>, <yingjoe.chen@...iatek.com>,
        <yong.wu@...iatek.com>, <youlin.pei@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH v6 02/22] iommu/mediatek: Use a struct as the platform data

Use a struct as the platform special data instead of the enumeration.
This is a prepare patch for adding mt8183 iommu support.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
Reviewed-by: Evan Green <evgreen@...omium.org>
---
 drivers/iommu/mtk_iommu.c | 24 ++++++++++++++++--------
 drivers/iommu/mtk_iommu.h |  6 +++++-
 2 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index de3e022..189d1b5 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -54,7 +54,7 @@
 #define REG_MMU_CTRL_REG			0x110
 #define F_MMU_PREFETCH_RT_REPLACE_MOD		BIT(4)
 #define F_MMU_TF_PROTECT_SEL_SHIFT(data) \
-	((data)->m4u_plat == M4U_MT2712 ? 4 : 5)
+	((data)->plat_data->m4u_plat == M4U_MT2712 ? 4 : 5)
 /* It's named by F_MMU_TF_PROT_SEL in mt2712. */
 #define F_MMU_TF_PROTECT_SEL(prot, data) \
 	(((prot) & 0x3) << F_MMU_TF_PROTECT_SEL_SHIFT(data))
@@ -520,7 +520,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
 	}
 
 	regval = F_MMU_TF_PROTECT_SEL(2, data);
-	if (data->m4u_plat == M4U_MT8173)
+	if (data->plat_data->m4u_plat == M4U_MT8173)
 		regval |= F_MMU_PREFETCH_RT_REPLACE_MOD;
 	writel_relaxed(regval, data->base + REG_MMU_CTRL_REG);
 
@@ -541,14 +541,14 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
 		F_INT_PRETETCH_TRANSATION_FIFO_FAULT;
 	writel_relaxed(regval, data->base + REG_MMU_INT_MAIN_CONTROL);
 
-	if (data->m4u_plat == M4U_MT8173)
+	if (data->plat_data->m4u_plat == M4U_MT8173)
 		regval = (data->protect_base >> 1) | (data->enable_4GB << 31);
 	else
 		regval = lower_32_bits(data->protect_base) |
 			 upper_32_bits(data->protect_base);
 	writel_relaxed(regval, data->base + REG_MMU_IVRP_PADDR);
 
-	if (data->enable_4GB && data->m4u_plat != M4U_MT8173) {
+	if (data->enable_4GB && data->plat_data->m4u_plat != M4U_MT8173) {
 		/*
 		 * If 4GB mode is enabled, the validate PA range is from
 		 * 0x1_0000_0000 to 0x1_ffff_ffff. here record bit[32:30].
@@ -559,7 +559,7 @@ static int mtk_iommu_hw_init(const struct mtk_iommu_data *data)
 	writel_relaxed(0, data->base + REG_MMU_DCM_DIS);
 
 	/* It's MISC control register whose default value is ok except mt8173.*/
-	if (data->m4u_plat == M4U_MT8173)
+	if (data->plat_data->m4u_plat == M4U_MT8173)
 		writel_relaxed(0, data->base + REG_MMU_STANDARD_AXI_MODE);
 
 	if (devm_request_irq(data->dev, data->irq, mtk_iommu_isr, 0,
@@ -592,7 +592,7 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 	data->dev = dev;
-	data->m4u_plat = (enum mtk_iommu_plat)of_device_get_match_data(dev);
+	data->plat_data = of_device_get_match_data(dev);
 
 	/* Protect memory. HW will access here while translation fault.*/
 	protect = devm_kzalloc(dev, MTK_PROTECT_PA_ALIGN * 2, GFP_KERNEL);
@@ -736,9 +736,17 @@ static int __maybe_unused mtk_iommu_resume(struct device *dev)
 	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mtk_iommu_suspend, mtk_iommu_resume)
 };
 
+static const struct mtk_iommu_plat_data mt2712_data = {
+	.m4u_plat     = M4U_MT2712,
+};
+
+static const struct mtk_iommu_plat_data mt8173_data = {
+	.m4u_plat     = M4U_MT8173,
+};
+
 static const struct of_device_id mtk_iommu_of_ids[] = {
-	{ .compatible = "mediatek,mt2712-m4u", .data = (void *)M4U_MT2712},
-	{ .compatible = "mediatek,mt8173-m4u", .data = (void *)M4U_MT8173},
+	{ .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
+	{ .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
 	{}
 };
 
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index 778498b..333a0ef 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -41,6 +41,10 @@ enum mtk_iommu_plat {
 	M4U_MT8173,
 };
 
+struct mtk_iommu_plat_data {
+	enum mtk_iommu_plat m4u_plat;
+};
+
 struct mtk_iommu_domain;
 
 struct mtk_iommu_data {
@@ -57,7 +61,7 @@ struct mtk_iommu_data {
 	bool				tlb_flush_active;
 
 	struct iommu_device		iommu;
-	enum mtk_iommu_plat		m4u_plat;
+	const struct mtk_iommu_plat_data *plat_data;
 
 	struct list_head		list;
 };
-- 
1.9.1