linux-kernel - [PATCH v4 3/6] iommu: support iommu configuration for fsl-mc devices

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Message-Id: <1525069641-8523-4-git-send-email-nipun.gupta@nxp.com>
Date:   Mon, 30 Apr 2018 11:57:18 +0530
From:   Nipun Gupta <nipun.gupta@....com>
To:     robin.murphy@....com, will.deacon@....com, robh+dt@...nel.org,
        robh@...nel.org, mark.rutland@....com, catalin.marinas@....com,
        gregkh@...uxfoundation.org
Cc:     hch@....de, joro@...tes.org, m.szyprowski@...sung.com,
        shawnguo@...nel.org, frowand.list@...il.com, bhelgaas@...gle.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        bharat.bhushan@....com, stuyoder@...il.com,
        laurentiu.tudor@....com, leoyang.li@....com,
        Nipun Gupta <nipun.gupta@....com>
Subject: [PATCH v4 3/6] iommu: support iommu configuration for fsl-mc devices

Signed-off-by: Nipun Gupta <nipun.gupta@....com>
---
 drivers/iommu/of_iommu.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c
index 811e160..284474d 100644
--- a/drivers/iommu/of_iommu.c
+++ b/drivers/iommu/of_iommu.c
@@ -24,6 +24,7 @@
 #include <linux/of_iommu.h>
 #include <linux/of_pci.h>
 #include <linux/slab.h>
+#include <linux/fsl/mc.h>
 
 #define NO_IOMMU	1
 
@@ -159,6 +160,23 @@ static int of_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
 	return err;
 }
 
+static int of_fsl_mc_iommu_init(struct fsl_mc_device *mc_dev,
+				struct device_node *master_np)
+{
+	struct of_phandle_args iommu_spec = { .args_count = 1 };
+	int err;
+
+	err = of_map_rid(master_np, mc_dev->icid, "iommu-map",
+			 "iommu-map-mask", &iommu_spec.np,
+			 iommu_spec.args);
+	if (err)
+		return err == -ENODEV ? NO_IOMMU : err;
+
+	err = of_iommu_xlate(&mc_dev->dev, &iommu_spec);
+	of_node_put(iommu_spec.np);
+	return err;
+}
+
 const struct iommu_ops *of_iommu_configure(struct device *dev,
 					   struct device_node *master_np)
 {
@@ -190,6 +208,8 @@ const struct iommu_ops *of_iommu_configure(struct device *dev,
 
 		err = pci_for_each_dma_alias(to_pci_dev(dev),
 					     of_pci_iommu_init, &info);
+	} else if (dev_is_fsl_mc(dev)) {
+		err = of_fsl_mc_iommu_init(to_fsl_mc_device(dev), master_np);
 	} else {
 		struct of_phandle_args iommu_spec;
 		int idx = 0;
-- 
1.9.1