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Subject[PATCH v2 8/9] ARM: OMAP: iommu: add device tree support
Date
Adapt driver to use DT if provided.

Signed-off-by: Omar Ramirez Luna <omar.luna@linaro.org>
---
.../devicetree/bindings/arm/omap/iommu.txt | 10 +++
arch/arm/mach-omap2/omap-iommu.c | 4 ++
drivers/iommu/omap-iommu.c | 65 +++++++++++++++++++-
3 files changed, 78 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/arm/omap/iommu.txt

diff --git a/Documentation/devicetree/bindings/arm/omap/iommu.txt b/Documentation/devicetree/bindings/arm/omap/iommu.txt
new file mode 100644
index 0000000..2bb780f
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/omap/iommu.txt
@@ -0,0 +1,10 @@
+* MMU (Memory Management Unit)
+
+MMU present in OMAP subsystems.
+
+Required properties:
+ compatible : should be "ti,omap3-iommu" for OMAP3 MMUs
+ compatible : should be "ti,omap4-iommu" for OMAP4 MMUs
+
+Optional properties:
+ None
diff --git a/arch/arm/mach-omap2/omap-iommu.c b/arch/arm/mach-omap2/omap-iommu.c
index e8f88dc..4b7912b 100644
--- a/arch/arm/mach-omap2/omap-iommu.c
+++ b/arch/arm/mach-omap2/omap-iommu.c
@@ -11,6 +11,7 @@
*/

#include <linux/module.h>
+#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/slab.h>
@@ -27,6 +28,9 @@ static int __init omap_iommu_dev_init(struct omap_hwmod *oh, void *unused)
struct omap_mmu_dev_attr *a = (struct omap_mmu_dev_attr *)oh->dev_attr;
static int i;

+ if (of_have_populated_dt())
+ return 0;
+
pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index 3f8eb04..fbfec44 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -21,12 +21,15 @@
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/pm_runtime.h>
+#include <linux/of.h>

#include <asm/cacheflush.h>

#include <plat/iommu.h>

#include <plat/iopgtable.h>
+#include <plat/omap_device.h>
+#include <plat/omap_hwmod.h>

#define for_each_iotlb_cr(obj, n, __i, cr) \
for (__i = 0; \
@@ -909,13 +912,63 @@ static void omap_iommu_detach(struct omap_iommu *obj)
/*
* OMAP Device MMU(IOMMU) detection
*/
+static int __devinit
+iommu_add_platform_data_from_dt(struct platform_device *pdev)
+{
+ struct iommu_platform_data *pdata;
+ struct device_node *node = pdev->dev.of_node;
+ struct omap_hwmod *oh;
+ struct omap_mmu_dev_attr *a;
+ int ret = 0;
+
+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ of_property_read_string(node, "ti,hwmods", &pdata->name);
+ oh = omap_hwmod_lookup(pdata->name);
+ if (!oh) {
+ dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n", pdata->name);
+ ret = -ENODEV;
+ goto out;
+ }
+
+ a = (struct omap_mmu_dev_attr *)oh->dev_attr;
+ pdata->nr_tlb_entries = a->nr_tlb_entries;
+ pdata->da_start = a->da_start;
+ pdata->da_end = a->da_end;
+
+ if (oh->rst_lines_cnt == 1) {
+ pdata->reset_name = oh->rst_lines->name;
+ pdata->assert_reset = omap_device_assert_hardreset;
+ pdata->deassert_reset = omap_device_deassert_hardreset;
+ }
+
+ ret = platform_device_add_data(pdev, pdata, sizeof(*pdata));
+ if (ret)
+ dev_err(&pdev->dev, "Cannot add pdata for %s\n", pdata->name);
+
+out:
+ kfree(pdata);
+
+ return ret;
+}
+
static int __devinit omap_iommu_probe(struct platform_device *pdev)
{
int err = -ENODEV;
int irq;
struct omap_iommu *obj;
struct resource *res;
- struct iommu_platform_data *pdata = pdev->dev.platform_data;
+ struct iommu_platform_data *pdata;
+
+ if (of_have_populated_dt()) {
+ err = iommu_add_platform_data_from_dt(pdev);
+ if (err)
+ return err;
+ }
+
+ pdata = pdev->dev.platform_data;

obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (!obj)
@@ -1024,12 +1077,22 @@ static const struct dev_pm_ops iommu_pm_ops = {
NULL)
};

+#if defined(CONFIG_OF)
+static const struct of_device_id omap_iommu_of_match[] = {
+ { .compatible = "ti,omap3-iommu" },
+ { .compatible = "ti,omap4-iommu" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, omap_iommu_of_match);
+#endif
+
static struct platform_driver omap_iommu_driver = {
.probe = omap_iommu_probe,
.remove = __devexit_p(omap_iommu_remove),
.driver = {
.name = "omap-iommu",
.pm = &iommu_pm_ops,
+ .of_match_table = of_match_ptr(omap_iommu_of_match),
},
};

--
1.7.9.5


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