Commit 89c788ba authored by Hiroshi DOYU's avatar Hiroshi DOYU Committed by Stephen Warren
Browse files

ARM: tegra: Add SMMU enabler in AHB 



Add extern func, "tegra_ahb_enable_smmu()" to inform AHB that SMMU is
ready.

Signed-off-by: default avatarHiroshi DOYU <hdoyu@nvidia.com>
Cc: Felipe Balbi <balbi@ti.com>
Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
parent 87d0bab2

arch/arm/mach-tegra/include/mach/tegra-ahb.h

0 → 100644
+19 −0
Original line number Diff line number Diff line 
/*

 * 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__ */

drivers/amba/tegra-ahb.c

+32 −0
Original line number Diff line number Diff line
@@ -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;