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| author |   Hiroshi DOYU <hdoyu@nvidia.com> | 2012-05-07 09:43:46 +0300 |
|---|---|---|
| committer |   Stephen Warren <swarren@nvidia.com> | 2012-05-08 13:30:49 -0600 |
| commit | 89c788bab1f0374ae05aef7560066442ceb55384 (patch) | |
| tree | 330832a873d9184a6c9e56270eee7be4d88b299c /drivers/amba | |
| parent | ARM: tegra: Add Tegra AHB driver (diff) | |
| download | linux-dev-89c788bab1f0374ae05aef7560066442ceb55384.tar.xz linux-dev-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.c | 32 |
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; |