diff options
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; |