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Commit d3b8bdd5 authored by Stephen Warren's avatar Stephen Warren Committed by Olof Johansson
Browse files

ARM: tegra: Add a simple PMC driver 



This PMC driver is enough to parse the nvidia,invert-interrupt property
from device tree, and configure the PMC's to honor that.

In the future, this file could expand to centralize all other PMC accesses
within the mach-tegra code.

Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
parent 8bc4f556

arch/arm/mach-tegra/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ obj-y += clock.o 
obj-y                                   += timer.o

obj-y                                   += pinmux.o

obj-y					+= fuse.o

obj-y					+= pmc.o

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= powergate.o

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += tegra2_clocks.o

obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= tegra2_emc.o

arch/arm/mach-tegra/common.c

+3 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include "board.h"

#include "clock.h"

#include "fuse.h"

#include "pmc.h"



/*

 * Storage for debug-macro.S's state.
@@ -117,11 +118,13 @@ void __init tegra20_init_early(void) 
	tegra2_init_clocks();

	tegra_clk_init_from_table(tegra20_clk_init_table);

	tegra_init_cache(0x331, 0x441);

	tegra_pmc_init();

}

#endif

#ifdef CONFIG_ARCH_TEGRA_3x_SOC

void __init tegra30_init_early(void)

{

	tegra_init_cache(0x441, 0x551);

	tegra_pmc_init();

}

#endif

arch/arm/mach-tegra/pmc.c

0 → 100644
+76 −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.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 */



#include <linux/kernel.h>

#include <linux/io.h>

#include <linux/of.h>



#include <mach/iomap.h>



#define PMC_CTRL		0x0

#define PMC_CTRL_INTR_LOW	(1 << 17)



static inline u32 tegra_pmc_readl(u32 reg)

{

	return readl(IO_ADDRESS(TEGRA_PMC_BASE + reg));

}



static inline void tegra_pmc_writel(u32 val, u32 reg)

{

	writel(val, IO_ADDRESS(TEGRA_PMC_BASE + reg));

}



#ifdef CONFIG_OF

static const struct of_device_id matches[] __initconst = {

	{ .compatible = "nvidia,tegra20-pmc" },

	{ }

};

#endif



void __init tegra_pmc_init(void)

{

	/*

	 * For now, Harmony is the only board that uses the PMC, and it wants

	 * the signal inverted. Seaboard would too if it used the PMC.

	 * Hopefully by the time other boards want to use the PMC, everything

	 * will be device-tree, or they also want it inverted.

	 */

	bool invert_interrupt = true;

	u32 val;



#ifdef CONFIG_OF

	if (of_have_populated_dt()) {

		struct device_node *np;



		invert_interrupt = false;



		np = of_find_matching_node(NULL, matches);

		if (np) {

			if (of_find_property(np, "nvidia,invert-interrupt",

						NULL))

				invert_interrupt = true;

		}

	}

#endif



	val = tegra_pmc_readl(PMC_CTRL);

	if (invert_interrupt)

		val |= PMC_CTRL_INTR_LOW;

	else

		val &= ~PMC_CTRL_INTR_LOW;

	tegra_pmc_writel(val, PMC_CTRL);

}

arch/arm/mach-tegra/pmc.h

0 → 100644
+23 −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.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 */



#ifndef __MACH_TEGRA_PMC_H

#define __MACH_TEGRA_PMC_H



void tegra_pmc_init(void);



#endif