linux-kernel - [PATCH v2 22/23] iommu/mediatek: Add mt8192 support

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Date:   Sat, 5 Sep 2020 16:09:19 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Robin Murphy <robin.murphy@....com>
CC:     Will Deacon <will@...nel.org>, Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.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>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, <chao.hao@...iatek.com>,
        <ming-fan.chen@...iatek.com>
Subject: [PATCH v2 22/23] iommu/mediatek: Add mt8192 support

Add mt8192 iommu support.

For multi domain, Add 1M gap for the vdec domain size. That is because
vdec HW has a end address register which require (start_addr +
len) rather than (start_addr + len - 1). Take a example, if the start_addr
is 0xfff00000, size is 0x100000, then the end_address is 0xfff00000 +
0x100000 = 0x1 0000 0000. but the register only is 32bit. thus HW will get
the end address is 0. To avoid this issue, I add 1M gap for this.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/iommu/mtk_iommu.c | 22 ++++++++++++++++++++++
 drivers/iommu/mtk_iommu.h |  1 +
 2 files changed, 23 insertions(+)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index d0593d317240..ebc3767b62ab 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -171,6 +171,16 @@ static const struct mtk_iommu_iova_region single_domain[] = {
 	{.iova_base = 0,		.size = SZ_4G},
 };
 
+static const struct mtk_iommu_iova_region mt8192_multi_dom[] = {
+	{ .iova_base = 0x0,		.size = SZ_4G},		/* disp: 0 ~ 4G */
+	#if IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT)
+	{ .iova_base = SZ_4G,		.size = SZ_4G - SZ_1M},	/* vdec: 4G ~ 8G gap: 1M */
+	{ .iova_base = SZ_4G * 2,	.size = SZ_4G - SZ_1M},	/* CAM/MDP: 8G ~ 12G */
+	{ .iova_base = 0x240000000ULL,	.size = 0x4000000},	/* CCU0 */
+	{ .iova_base = 0x244000000ULL,	.size = 0x4000000},	/* CCU1 */
+	#endif
+};
+
 /*
  * There may be 1 or 2 M4U HWs, But we always expect they are in the same domain
  * for the performance.
@@ -967,11 +977,23 @@ static const struct mtk_iommu_plat_data mt8183_data = {
 	.larbid_remap = {{0}, {4}, {5}, {6}, {7}, {2}, {3}, {1}},
 };
 
+static const struct mtk_iommu_plat_data mt8192_data = {
+	.m4u_plat       = M4U_MT8192,
+	.flags          = HAS_BCLK | HAS_SUB_COMM | OUT_ORDER_WR_EN |
+			  WR_THROT_EN | IOVA_34_EN,
+	.inv_sel_reg    = REG_MMU_INV_SEL_GEN2,
+	.iova_region    = mt8192_multi_dom,
+	.iova_region_nr = ARRAY_SIZE(mt8192_multi_dom),
+	.larbid_remap   = {{0}, {1}, {4, 5}, {7}, {2}, {9, 11, 19, 20},
+			   {0, 14, 16}, {0, 13, 18, 17}},
+};
+
 static const struct of_device_id mtk_iommu_of_ids[] = {
 	{ .compatible = "mediatek,mt2712-m4u", .data = &mt2712_data},
 	{ .compatible = "mediatek,mt6779-m4u", .data = &mt6779_data},
 	{ .compatible = "mediatek,mt8173-m4u", .data = &mt8173_data},
 	{ .compatible = "mediatek,mt8183-m4u", .data = &mt8183_data},
+	{ .compatible = "mediatek,mt8192-m4u", .data = &mt8192_data},
 	{}
 };
 
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index 5e346464cdf8..d2702eda25d4 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -42,6 +42,7 @@ enum mtk_iommu_plat {
 	M4U_MT6779,
 	M4U_MT8173,
 	M4U_MT8183,
+	M4U_MT8192,
 };
 
 struct mtk_iommu_iova_region;
-- 
2.18.0