This adds the xlate callback which gets invoked during
device registration from DT. The master devices gets added
through this. Also adding the iommu_of_setup callback here.
Signed-off-by: Sricharan R <sricharan@xxxxxxxxxxxxxx>
---
drivers/iommu/msm_iommu.c | 51 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 49 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index 1210152..1d95d7c 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -28,6 +28,7 @@
#include <linux/iommu.h>
#include <linux/clk.h>
#include <linux/err.h>
+#include <linux/of_iommu.h>
#include <asm/cacheflush.h>
#include <asm/sizes.h>
@@ -702,6 +703,44 @@ static void print_ctx_regs(void __iomem *base, int ctx)
GET_PRRR(base, ctx), GET_NMRR(base, ctx));
}
+static void insert_iommu_master(struct device *dev,
+ struct msm_iommu_dev *iommu,
+ struct of_phandle_args *spec)
+{
+ struct msm_iommu_ctx_dev *master;
+ int sid;
+
+ master = kzalloc(sizeof(*master), GFP_KERNEL);
+ master->of_node = dev->of_node;
+ list_add(&master->list, &iommu->ctx_list);
+
+ for (sid = 0; sid < spec->args_count; sid++)
+ master->mids[sid] = spec->args[sid];
+
+ master->num_mids = spec->args_count;
+}
+
+static int qcom_iommu_of_xlate(struct device *dev,
+ struct of_phandle_args *spec)
+{
+ struct msm_iommu_dev *iommu;
+ unsigned long flags;
+
+ spin_lock_irqsave(&msm_iommu_lock, flags);
+ list_for_each_entry(iommu, &qcom_iommu_devices, dev_node) {
+ if (iommu->dev->of_node == spec->np)
+ break;
+ }
+
+ if (!iommu || (iommu->dev->of_node != spec->np))
+ return -ENODEV;
+
+ insert_iommu_master(dev, iommu, spec);
+ spin_unlock_irqrestore(&msm_iommu_lock, flags);
+
+ return 0;
+}
+
irqreturn_t msm_iommu_fault_handler(int irq, void *dev_id)
{
struct msm_iommu_dev *iommu = dev_id;
@@ -737,7 +776,7 @@ fail:
return 0;
}
-static const struct iommu_ops msm_iommu_ops = {
+static struct iommu_ops msm_iommu_ops = {
.capable = msm_iommu_capable,
.domain_alloc = msm_iommu_domain_alloc,
.domain_free = msm_iommu_domain_free,
@@ -748,6 +787,7 @@ static const struct iommu_ops msm_iommu_ops = {
.map_sg = default_iommu_map_sg,
.iova_to_phys = msm_iommu_iova_to_phys,
.pgsize_bitmap = MSM_IOMMU_PGSIZES,
+ .of_xlate = qcom_iommu_of_xlate,
};
static int msm_iommu_probe(struct platform_device *pdev)
@@ -832,6 +872,7 @@ static int msm_iommu_probe(struct platform_device *pdev)
}
list_add(&iommu->dev_node, &qcom_iommu_devices);
+ of_iommu_set_ops(pdev->dev.of_node, &msm_iommu_ops);
pr_info("device mapped at %p, irq %d with %d ctx banks\n",
iommu->base, iommu->irq, iommu->ncb);
@@ -916,7 +957,13 @@ static int __init msm_iommu_init(void)
return 0;
}
-subsys_initcall(msm_iommu_init);
+static int __init msm_iommu_of_setup(struct device_node *np)
+{
+ msm_iommu_init();
+ return 0;
+}
+
+IOMMU_OF_DECLARE(msm_iommu_of, "qcom,iommu-v0", msm_iommu_of_setup);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Stepan Moskovchenko <stepanm@xxxxxxxxxxxxxx>");
--
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