[PATCH v3 2/3] iommu/mediatek: Add enable IOMMU SMC command for INFRA master

[Chengci.Xu]

The register which can enable IOMMU for INFRA master should be setted
in secure world for security concerns. Therefore, we add a SMC command
for INFRA master to enable/disable INFRA IOMMU in ATF. This function is
prepared for MT8188.

Signed-off-by: Chengci.Xu <chengci.xu at mediatek.com>
---
 drivers/iommu/mtk_iommu.c  | 21 +++++++++++++++++++--
 include/soc/mediatek/smi.h |  1 +
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 552e4eb8c610..8b8a289bab2c 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 at mediatek.com>
  */
+#include <linux/arm-smccc.h>
 #include <linux/bitfield.h>
 #include <linux/bug.h>
 #include <linux/clk.h>
@@ -28,6 +29,7 @@
 #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>
 
@@ -138,6 +140,7 @@
 #define PM_CLK_AO			BIT(15)
 #define IFA_IOMMU_PCIE_SUPPORT		BIT(16)
 #define PGTABLE_PA_35_EN		BIT(17)
+#define CFG_IFA_MASTER_IN_ATF		BIT(18)
 
 #define MTK_IOMMU_HAS_FLAG_MASK(pdata, _x, mask)	\
 				((((pdata)->flags) & (mask)) == (_x))
@@ -553,7 +556,20 @@ static int mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev,
 				larb_mmu->mmu |= MTK_SMI_MMU_EN(portid);
 			else
 				larb_mmu->mmu &= ~MTK_SMI_MMU_EN(portid);
-		} 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)) {
+			struct arm_smccc_res res;
+
+			arm_smccc_smc(MTK_SIP_KERNEL_IOMMU_CONTROL,
+				      IOMMU_ATF_CMD_CONFIG_INFRA_IOMMU,
+				      portid, enable, 0, 0, 0, 0, &res);
+			if (res.a0 != 0) {
+				dev_err(dev, "%s iommu(%s) inframaster %d fail(%ld).\n",
+					enable ? "enable" : "disable",
+					dev_name(data->dev), portid, res.a0);
+				ret = -EINVAL;
+			}
+		} else {
 			peri_mmuen_msk = BIT(portid);
 			/* PCI dev has only one output id, enable the next writing bit for PCIe */
 			if (dev_is_pci(dev))
@@ -1213,7 +1229,8 @@ 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..99f13b0e416d 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 en/disable iommu */
 	IOMMU_ATF_CMD_MAX,
 };
 
-- 
2.25.1