linux-kernel - [PATCH v9 4/7] iommu/mediatek: Add enable IOMMU SMC command for INFRA masters

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Message-ID: <20230317085541.20447-5-yong.wu@mediatek.com>
Date:   Fri, 17 Mar 2023 16:55:38 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Yong Wu <yong.wu@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>, <iommu@...ts.linux.dev>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <mingyuan.ma@...iatek.com>,
        <yf.wang@...iatek.com>, <jianjiao.zeng@...iatek.com>,
        <chengci.xu@...iatek.com>
Subject: [PATCH v9 4/7] iommu/mediatek: Add enable IOMMU SMC command for INFRA masters

From: "Chengci.Xu" <chengci.xu@...iatek.com>

Prepare for MT8188. In MT8188, the register which enables IOMMU for
INFRA masters are in the secure world for security concerns, therefore we
add a SMC command for INFRA masters to enable IOMMU in ATF.

Signed-off-by: Chengci.Xu <chengci.xu@...iatek.com>
Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
 drivers/iommu/mtk_iommu.c  | 32 ++++++++++++++++++++++----------
 include/soc/mediatek/smi.h |  1 +
 2 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 7ba05fa58c20..afd690da61e3 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2015-2016 MediaTek Inc.
  * Author: Yong Wu <yong.wu@...iatek.com>
  */
+#include <linux/arm-smccc.h>
 #include <linux/bitfield.h>
 #include <linux/bug.h>
 #include <linux/clk.h>
@@ -27,6 +28,7 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/soc/mediatek/infracfg.h>
+#include <linux/soc/mediatek/mtk_sip_svc.h>
 #include <asm/barrier.h>
 #include <soc/mediatek/smi.h>
 
@@ -143,6 +145,7 @@
 #define PGTABLE_PA_35_EN		BIT(17)
 #define TF_PORT_TO_ADDR_MT8173		BIT(18)
 #define INT_ID_PORT_WIDTH_6		BIT(19)
+#define CFG_IFA_MASTER_IN_ATF		BIT(20)
 
 #define MTK_IOMMU_HAS_FLAG_MASK(pdata, _x, mask)	\
 				((((pdata)->flags) & (mask)) == (_x))
@@ -584,6 +587,7 @@ static int mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev,
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	const struct mtk_iommu_iova_region *region;
 	unsigned long portid_msk = 0;
+	struct arm_smccc_res res;
 	int i, ret = 0;
 
 	for (i = 0; i < fwspec->num_ids; ++i) {
@@ -609,17 +613,24 @@ static int mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev,
 		else
 			larb_mmu->mmu &= ~portid_msk;
 	} else if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_INFRA)) {
-		/* PCI dev has only one output id, enable the next writing bit for PCIe */
-		if (dev_is_pci(dev)) {
-			if (fwspec->num_ids != 1) {
-				dev_err(dev, "PCI dev can only have one port.\n");
-				return -ENODEV;
+		if (MTK_IOMMU_HAS_FLAG(data->plat_data, CFG_IFA_MASTER_IN_ATF)) {
+			arm_smccc_smc(MTK_SIP_KERNEL_IOMMU_CONTROL,
+				      IOMMU_ATF_CMD_CONFIG_INFRA_IOMMU,
+				      portid_msk, enable, 0, 0, 0, 0, &res);
+			ret = res.a0;
+		} else {
+			/* PCI dev has only one output id, enable the next writing bit for PCIe */
+			if (dev_is_pci(dev)) {
+				if (fwspec->num_ids != 1) {
+					dev_err(dev, "PCI dev can only have one port.\n");
+					return -ENODEV;
+				}
+				portid_msk |= BIT(portid + 1);
 			}
-			portid_msk |= BIT(portid + 1);
-		}
 
-		ret = regmap_update_bits(data->pericfg, PERICFG_IOMMU_1,
-					 (u32)portid_msk, enable ? (u32)portid_msk : 0);
+			ret = regmap_update_bits(data->pericfg, PERICFG_IOMMU_1,
+						 (u32)portid_msk, enable ? (u32)portid_msk : 0);
+		}
 		if (ret)
 			dev_err(dev, "%s iommu(%s) inframaster 0x%lx fail(%d).\n",
 				enable ? "enable" : "disable",
@@ -1317,7 +1328,8 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 			dev_err_probe(dev, ret, "mm dts parse fail\n");
 			goto out_runtime_disable;
 		}
-	} else if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_INFRA)) {
+	} else if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_INFRA) &&
+		   !MTK_IOMMU_HAS_FLAG(data->plat_data, CFG_IFA_MASTER_IN_ATF)) {
 		p = data->plat_data->pericfg_comp_str;
 		data->pericfg = syscon_regmap_lookup_by_compatible(p);
 		if (IS_ERR(data->pericfg)) {
diff --git a/include/soc/mediatek/smi.h b/include/soc/mediatek/smi.h
index dfd8efca5e60..000eb1cf68b7 100644
--- a/include/soc/mediatek/smi.h
+++ b/include/soc/mediatek/smi.h
@@ -13,6 +13,7 @@
 
 enum iommu_atf_cmd {
 	IOMMU_ATF_CMD_CONFIG_SMI_LARB,		/* For mm master to en/disable iommu */
+	IOMMU_ATF_CMD_CONFIG_INFRA_IOMMU,	/* For infra master to enable iommu */
 	IOMMU_ATF_CMD_MAX,
 };
 
-- 
2.25.1