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Subject[PATCH 2/3] iommu/tegra: smmu: Add device tree support for SMMU
Date
Add device tree support for Tegra30 IOMMU(SMMU).

Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com>
---
.../bindings/iommu/nvidia,tegra30-smmu.txt | 20 ++++++++
drivers/iommu/tegra-smmu.c | 47 +++++++++++++++-----
2 files changed, 55 insertions(+), 12 deletions(-)

diff --git a/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
new file mode 100644
index 0000000..6f942ff
--- /dev/null
+++ b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt
@@ -0,0 +1,20 @@
+NVIDIA Tegra 30 IOMMU H/W, SMMU (System Memory Management Unit)
+
+Required properties:
+- compatible : "nvidia,tegra30-smmu"
+- reg : Should contain 3 register ranges(address and length) for each
+ of the SMMU register blocks.
+- interrupts : Should contain MC General interrupt.
+- asids : # of ASIDs
+- dma-window: IOVA start address and length.
+
+Example:
+ smmu: smmu@7000f000 {
+ compatible = "nvidia,tegra30-smmu";
+ reg = <0x7000f010 0x2c /* controller registers */
+ 0x7000f1f0 0x10 /* statics */
+ 0x7000f228 0x5c>; /* module configuration */
+ interrupts = <0 13 0x40>;
+ asids = <4>; /* # of ASIDs */
+ dma-window = <0 0x40000000>; /* IOVA start & length */
+ };
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 90bbf07..c2827a6 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -30,6 +30,8 @@
#include <linux/sched.h>
#include <linux/iommu.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>

#include <asm/page.h>
#include <asm/cacheflush.h>
@@ -112,7 +114,6 @@

#define SMMU_PDE_NEXT_SHIFT 28

-#define SMMU_NUM_ASIDS 4
#define SMMU_TLB_FLUSH_VA_SECTION__MASK 0xffc00000
#define SMMU_TLB_FLUSH_VA_SECTION__SHIFT 12 /* right shift */
#define SMMU_TLB_FLUSH_VA_GROUP__MASK 0xffffc000
@@ -868,15 +869,33 @@ static int tegra_smmu_resume(struct device *dev)
static int tegra_smmu_probe(struct platform_device *pdev)
{
struct smmu_device *smmu;
- struct resource *res[NUM_SMMU_REG_BLOCKS], *window;
+ struct resource *res[NUM_SMMU_REG_BLOCKS];
struct device *dev = &pdev->dev;
- int i, err = 0;
+ int i, asids, err = 0;
+ dma_addr_t base;
+ size_t size;
+
+ if (!dev->of_node)
+ return -ENODEV;

if (smmu_handle)
return -EIO;

BUILD_BUG_ON(PAGE_SHIFT != SMMU_PAGE_SHIFT);

+ err = of_parse_dma_window(dev->of_node, "dma-window", 0, NULL,
+ &base, &size);
+ if (err)
+ return -ENODEV;
+
+ size >>= SMMU_PAGE_SHIFT;
+ if (!size)
+ return -ENODEV;
+
+ asids = be32_to_cpup(of_get_property(dev->of_node, "asids", NULL));
+ if (!asids)
+ return -ENODEV;
+
for (i = 0; i < ARRAY_SIZE(res); i++) {
res[i] = platform_get_resource(pdev, IORESOURCE_MEM, i);
if (!res[i])
@@ -894,12 +913,6 @@ static int tegra_smmu_probe(struct platform_device *pdev)
return -EIO;
}

- window = platform_get_resource(pdev, IORESOURCE_MEM, 3);
- if (!window) {
- dev_err(dev, "No SMMU resources\n");
- return -ENODEV;
- }
-
smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
if (!smmu) {
dev_err(dev, "failed to allocate smmu_device\n");
@@ -907,9 +920,9 @@ static int tegra_smmu_probe(struct platform_device *pdev)
}

smmu->dev = dev;
- smmu->num_as = SMMU_NUM_ASIDS;
- smmu->iovmm_base = (unsigned long)window->start;
- smmu->page_count = resource_size(window) >> SMMU_PAGE_SHIFT;
+ smmu->num_as = asids;
+ smmu->iovmm_base = base;
+ smmu->page_count = size;
smmu->regs = devm_ioremap(dev, res[0]->start,
res[2]->end - res[0]->start + 1);
if (!smmu->regs) {
@@ -1009,6 +1022,14 @@ const struct dev_pm_ops tegra_smmu_pm_ops = {
.resume = tegra_smmu_resume,
};

+#ifdef CONFIG_OF
+static struct of_device_id tegra_smmu_of_match[] __devinitdata = {
+ { .compatible = "nvidia,tegra30-smmu", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_smmu_of_match);
+#endif
+
static struct platform_driver tegra_smmu_driver = {
.probe = tegra_smmu_probe,
.remove = tegra_smmu_remove,
@@ -1016,6 +1037,7 @@ static struct platform_driver tegra_smmu_driver = {
.owner = THIS_MODULE,
.name = "tegra-smmu",
.pm = &tegra_smmu_pm_ops,
+ .of_match_table = of_match_ptr(tegra_smmu_of_match),
},
};

@@ -1035,4 +1057,5 @@ module_exit(tegra_smmu_exit);

MODULE_DESCRIPTION("IOMMU API for SMMU in Tegra30");
MODULE_AUTHOR("Hiroshi DOYU <hdoyu@nvidia.com>");
+MODULE_ALIAS("platform:tegra-smmu");
MODULE_LICENSE("GPL v2");
--
1.7.5.4


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