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ARM: tegra: Add SMMU enabler in AHB

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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>
This commit is contained in:
Hiroshi DOYU 2012-05-07 09:43:46 +03:00 committed by Stephen Warren
parent 87d0bab2cb
commit 89c788bab1
2 changed files with 51 additions and 0 deletions
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19
arch/arm/mach-tegra/include/mach/tegra-ahb.h Normal file
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@ -0,0 +1,19 @@
/*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#ifndef __MACH_TEGRA_AHB_H__
#define __MACH_TEGRA_AHB_H__
extern int tegra_ahb_enable_smmu(struct device_node *ahb);
#endif /* __MACH_TEGRA_AHB_H__ */

32
drivers/amba/tegra-ahb.c
View File

@ -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;