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ARM: tegra: Add a simple PMC driver

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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: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Stephen Warren
2012-01-25 14:43:28 -07:00
committed by Olof Johansson
parent 8bc4f556bd
commit d3b8bdd5f9
4 changed files with 103 additions and 0 deletions
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76
arch/arm/mach-tegra/pmc.c Normal file
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/*
* 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);
}