[PATCH v4 21/35] iommu/mediatek: Add infra iommu support

[Yong Wu]

The infra iommu enable bits in mt8195 is in the pericfg register segment,
use regmap to update it.

If infra iommu master translation fault, It doesn't have the larbid/portid,
thus print out the whole register value.

Since regmap_update_bits may fail, add return value for mtk_iommu_config.

Signed-off-by: Yong Wu <yong.wu@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
 drivers/iommu/mtk_iommu.c | 36 +++++++++++++++++++++++++++++-------
 drivers/iommu/mtk_iommu.h |  2 ++
 2 files changed, 31 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 531f4750c721..7176c212037f 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -112,6 +112,8 @@
 
 #define MTK_PROTECT_PA_ALIGN			256
 
+#define PERICFG_IOMMU_1				0x714
+
 #define HAS_4GB_MODE			BIT(0)
 /* HW will use the EMI clock if there isn't the "bclk". */
 #define HAS_BCLK			BIT(1)
@@ -343,8 +345,8 @@ static irqreturn_t mtk_iommu_isr(int irq, void *dev_id)
 			       write ? IOMMU_FAULT_WRITE : IOMMU_FAULT_READ)) {
 		dev_err_ratelimited(
 			data->dev,
-			"fault type=0x%x iova=0x%llx pa=0x%llx larb=%d port=%d layer=%d %s\n",
-			int_state, fault_iova, fault_pa, fault_larb, fault_port,
+			"fault type=0x%x iova=0x%llx pa=0x%llx master=0x%x(larb=%d port=%d) layer=%d %s\n",
+			int_state, fault_iova, fault_pa, regval, fault_larb, fault_port,
 			layer, write ? "write" : "read");
 	}
 
@@ -388,14 +390,15 @@ static int mtk_iommu_get_domain_id(struct device *dev,
 	return -EINVAL;
 }
 
-static void mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev,
-			     bool enable, unsigned int domid)
+static int mtk_iommu_config(struct mtk_iommu_data *data, struct device *dev,
+			    bool enable, unsigned int domid)
 {
 	struct mtk_smi_larb_iommu    *larb_mmu;
 	unsigned int                 larbid, portid;
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	const struct mtk_iommu_iova_region *region;
-	int i;
+	u32 peri_mmuen, peri_mmuen_msk;
+	int i, ret = 0;
 
 	for (i = 0; i < fwspec->num_ids; ++i) {
 		larbid = MTK_M4U_TO_LARB(fwspec->ids[i]);
@@ -415,8 +418,19 @@ static void 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)) {
+			peri_mmuen_msk = BIT(portid);
+			peri_mmuen = enable ? peri_mmuen_msk : 0;
+
+			ret = regmap_update_bits(data->pericfg, PERICFG_IOMMU_1,
+						 peri_mmuen_msk, peri_mmuen);
+			if (ret)
+				dev_err(dev, "%s iommu(%s) inframaster 0x%x fail(%d).\n",
+					enable ? "enable" : "disable",
+					dev_name(data->dev), peri_mmuen_msk, ret);
 		}
 	}
+	return ret;
 }
 
 static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom,
@@ -531,8 +545,7 @@ static int mtk_iommu_attach_device(struct iommu_domain *domain,
 	}
 	mutex_unlock(&data->mutex);
 
-	mtk_iommu_config(data, dev, true, domid);
-	return 0;
+	return mtk_iommu_config(data, dev, true, domid);
 
 data_unlock:
 	mutex_unlock(&data->mutex);
@@ -956,6 +969,15 @@ static int mtk_iommu_probe(struct platform_device *pdev)
 		ret = mtk_iommu_mm_dts_parse(dev, &match, data);
 		if (ret)
 			goto out_runtime_disable;
+	} else if (MTK_IOMMU_IS_TYPE(data->plat_data, MTK_IOMMU_TYPE_INFRA) &&
+		   data->plat_data->pericfg_comp_str) {
+		infracfg = syscon_regmap_lookup_by_compatible(data->plat_data->pericfg_comp_str);
+		if (IS_ERR(infracfg)) {
+			ret = PTR_ERR(infracfg);
+			goto out_runtime_disable;
+		}
+
+		data->pericfg = infracfg;
 	}
 
 	platform_set_drvdata(pdev, data);
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index 82c51a034e6b..04e5e5e7fd62 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -55,6 +55,7 @@ struct mtk_iommu_plat_data {
 	u32                 flags;
 	u32                 inv_sel_reg;
 
+	char					*pericfg_comp_str;
 	struct list_head			*hw_list;
 	unsigned int				iova_region_nr;
 	const struct mtk_iommu_iova_region	*iova_region;
@@ -80,6 +81,7 @@ struct mtk_iommu_data {
 	struct device			*smicomm_dev;
 
 	struct dma_iommu_mapping	*mapping; /* For mtk_iommu_v1.c */
+	struct regmap			*pericfg;
 
 	struct mutex			mutex; /* Protect m4u_group/m4u_dom above */
 
-- 
2.18.0