This patch uses IOMMU_OF_DECLARE to register the driver
and the iommu_ops. So when master devices of the iommu are
registered, of_xlate callback can be used to add the master
configurations to the smmu driver.
Signed-off-by: Sricharan R <sricha...@codeaurora.org>
---
drivers/iommu/arm-smmu.c | 36 +++++++++++++++++++++++-------------
1 file changed, 23 insertions(+), 13 deletions(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index fc13dd5..8c4eb43 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -41,6 +41,8 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
+#include <linux/of_iommu.h>
+#include <linux/of_platform.h>
#include <linux/amba/bus.h>
@@ -254,6 +256,8 @@
#define FSYNR0_WNR (1 << 4)
static int force_stage;
+static bool init_done;
+
module_param_named(force_stage, force_stage, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(force_stage,
"Force SMMU mappings to be installed at a particular stage of
translation. A value of '1' or '2' forces the corresponding stage. All other
values are ignored (i.e. no stage is forced). Note that selecting a specific
stage will disable support for nested translation.");
@@ -1848,20 +1852,8 @@ static struct platform_driver arm_smmu_driver = {
static int __init arm_smmu_init(void)
{
- struct device_node *np;
int ret;
- /*
- * Play nice with systems that don't have an ARM SMMU by checking that
- * an ARM SMMU exists in the system before proceeding with the driver
- * and IOMMU bus operation registration.
- */
- np = of_find_matching_node(NULL, arm_smmu_of_match);
- if (!np)
- return 0;
-
- of_node_put(np);
-
ret = platform_driver_register(&arm_smmu_driver);
if (ret)
return ret;
@@ -1880,15 +1872,33 @@ static int __init arm_smmu_init(void)
bus_set_iommu(&pci_bus_type, &arm_smmu_ops);
#endif
+ init_done = true;
+
return 0;
}
+static int __init arm_smmu_of_setup(struct device_node *np)
+{
+
+ if (!init_done)
+ arm_smmu_init();
+
+ of_iommu_set_ops(np, &arm_smmu_ops);
+
+ return 0;
+}
+
+IOMMU_OF_DECLARE(arm_smmu_v1, "arm,smmu-v1", arm_smmu_of_setup);
+IOMMU_OF_DECLARE(arm_smmu_v2, "arm,smmu-v2", arm_smmu_of_setup);
+IOMMU_OF_DECLARE(arm_smmu_400, "arm,mmu-400", arm_smmu_of_setup);
+IOMMU_OF_DECLARE(arm_smmu_401, "arm,mmu-401", arm_smmu_of_setup);
+IOMMU_OF_DECLARE(arm_smmu_500, "arm,mmu-500", arm_smmu_of_setup);
+
static void __exit arm_smmu_exit(void)
{
return platform_driver_unregister(&arm_smmu_driver);
}
-subsys_initcall(arm_smmu_init);
module_exit(arm_smmu_exit);
MODULE_DESCRIPTION("IOMMU API for ARM architected SMMU implementations");
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of
Code Aurora Forum, hosted by The Linux Foundation
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