linux-kernel - [PATCH v11 2/2] iommu/mediatek: Allow page table PA up to 35bit

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Date:   Thu, 30 Jun 2022 14:25:07 +0800
From:   <yf.wang@...iatek.com>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        "Joerg Roedel" <joro@...tes.org>, Yong Wu <Yong.Wu@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <wsd_upstream@...iatek.com>, Libo Kang <Libo.Kang@...iatek.com>,
        Ning Li <ning.li@...iatek.com>,
        Yunfei Wang <yf.wang@...iatek.com>,
        Yong Wu <yong.wu@...iatek.com>,
        "open list:MEDIATEK IOMMU DRIVER" <iommu@...ts.linux-foundation.org>,
        "moderated list:MEDIATEK IOMMU DRIVER" 
        <linux-mediatek@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: [PATCH v11 2/2] iommu/mediatek: Allow page table PA up to 35bit

From: Yunfei Wang <yf.wang@...iatek.com>

Single memory zone feature will remove ZONE_DMA32 and ZONE_DMA. So add
the quirk IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT to let level 1 and level 2
pgtable support at most 35bit PA.

Signed-off-by: Ning Li <ning.li@...iatek.com>
Signed-off-by: Yunfei Wang <yf.wang@...iatek.com>
---
 drivers/iommu/mtk_iommu.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index bb9dd92c9898..168b2bbf5e2b 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -138,6 +138,7 @@
 /* PM and clock always on. e.g. infra iommu */
 #define PM_CLK_AO			BIT(15)
 #define IFA_IOMMU_PCIE_SUPPORT		BIT(16)
+#define PGTABLE_PA_35_EN		BIT(17)
 
 #define MTK_IOMMU_HAS_FLAG_MASK(pdata, _x, mask)	\
 				((((pdata)->flags) & (mask)) == (_x))
@@ -596,6 +597,9 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom,
 		.iommu_dev = data->dev,
 	};
 
+	if (MTK_IOMMU_HAS_FLAG(data->plat_data, PGTABLE_PA_35_EN))
+		dom->cfg.quirks |= IO_PGTABLE_QUIRK_ARM_MTK_TTBR_EXT;
+
 	if (MTK_IOMMU_HAS_FLAG(data->plat_data, HAS_4GB_MODE))
 		dom->cfg.oas = data->enable_4GB ? 33 : 32;
 	else
@@ -684,8 +688,7 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
 			goto err_unlock;
 		}
 		bank->m4u_dom = dom;
-		writel(dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK,
-		       bank->base + REG_MMU_PT_BASE_ADDR);
+		writel(dom->cfg.arm_v7s_cfg.ttbr, bank->base + REG_MMU_PT_BASE_ADDR);
 
 		pm_runtime_put(m4udev);
 	}
@@ -1366,8 +1369,7 @@ static int __maybe_unused mtk_iommu_runtime_resume(struct device *dev)
 		writel_relaxed(reg->int_control[i], base + REG_MMU_INT_CONTROL0);
 		writel_relaxed(reg->int_main_control[i], base + REG_MMU_INT_MAIN_CONTROL);
 		writel_relaxed(reg->ivrp_paddr[i], base + REG_MMU_IVRP_PADDR);
-		writel(m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK,
-		       base + REG_MMU_PT_BASE_ADDR);
+		writel(m4u_dom->cfg.arm_v7s_cfg.ttbr, base + REG_MMU_PT_BASE_ADDR);
 	} while (++i < data->plat_data->banks_num);
 
 	/*
@@ -1401,7 +1403,7 @@ static const struct mtk_iommu_plat_data mt2712_data = {
 static const struct mtk_iommu_plat_data mt6779_data = {
 	.m4u_plat      = M4U_MT6779,
 	.flags         = HAS_SUB_COMM_2BITS | OUT_ORDER_WR_EN | WR_THROT_EN |
-			 MTK_IOMMU_TYPE_MM,
+			 MTK_IOMMU_TYPE_MM | PGTABLE_PA_35_EN,
 	.inv_sel_reg   = REG_MMU_INV_SEL_GEN2,
 	.banks_num    = 1,
 	.banks_enable = {true},
-- 
2.18.0