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authorHiroshi DOYU <hdoyu@nvidia.com>2012-05-07 08:43:46 +0200
committerStephen Warren <swarren@nvidia.com>2012-05-08 21:30:49 +0200
commit89c788bab1f0374ae05aef7560066442ceb55384 (patch)
tree330832a873d9184a6c9e56270eee7be4d88b299c /drivers/amba
parentARM: tegra: Add Tegra AHB driver (diff)
downloadlinux-89c788bab1f0374ae05aef7560066442ceb55384.tar.xz
linux-89c788bab1f0374ae05aef7560066442ceb55384.zip
ARM: tegra: Add SMMU enabler in AHB
Add extern func, "tegra_ahb_enable_smmu()" to inform AHB that SMMU is ready. Signed-off-by: Hiroshi DOYU <hdoyu@nvidia.com> Cc: Felipe Balbi <balbi@ti.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'drivers/amba')
-rw-r--r--drivers/amba/tegra-ahb.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/amba/tegra-ahb.c b/drivers/amba/tegra-ahb.c
index 106a780d29a0..aa0b1f160528 100644
--- a/drivers/amba/tegra-ahb.c
+++ b/drivers/amba/tegra-ahb.c
@@ -76,6 +76,10 @@
#define AHB_ARBITRATION_AHB_MEM_WRQUE_MST_ID 0xf8
+#define AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE BIT(17)
+
+static struct platform_driver tegra_ahb_driver;
+
static const u32 tegra_ahb_gizmo[] = {
AHB_ARBITRATION_DISABLE,
AHB_ARBITRATION_PRIORITY_CTRL,
@@ -124,6 +128,34 @@ static inline void gizmo_writel(struct tegra_ahb *ahb, u32 value, u32 offset)
writel(value, ahb->regs + offset);
}
+#ifdef CONFIG_ARCH_TEGRA_3x_SOC
+static int tegra_ahb_match_by_smmu(struct device *dev, void *data)
+{
+ struct tegra_ahb *ahb = dev_get_drvdata(dev);
+ struct device_node *dn = data;
+
+ return (ahb->dev->of_node == dn) ? 1 : 0;
+}
+
+int tegra_ahb_enable_smmu(struct device_node *dn)
+{
+ struct device *dev;
+ u32 val;
+ struct tegra_ahb *ahb;
+
+ dev = driver_find_device(&tegra_ahb_driver.driver, NULL, dn,
+ tegra_ahb_match_by_smmu);
+ if (!dev)
+ return -EPROBE_DEFER;
+ ahb = dev_get_drvdata(dev);
+ val = gizmo_readl(ahb, AHB_ARBITRATION_XBAR_CTRL);
+ val |= AHB_ARBITRATION_XBAR_CTRL_SMMU_INIT_DONE;
+ gizmo_writel(ahb, val, AHB_ARBITRATION_XBAR_CTRL);
+ return 0;
+}
+EXPORT_SYMBOL(tegra_ahb_enable_smmu);
+#endif
+
static int tegra_ahb_suspend(struct device *dev)
{
int i;