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77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
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/*
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* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <mach/iomap.h>
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#define PMC_CTRL 0x0
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#define PMC_CTRL_INTR_LOW (1 << 17)
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static inline u32 tegra_pmc_readl(u32 reg)
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{
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return readl(IO_ADDRESS(TEGRA_PMC_BASE + reg));
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}
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static inline void tegra_pmc_writel(u32 val, u32 reg)
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{
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writel(val, IO_ADDRESS(TEGRA_PMC_BASE + reg));
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}
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#ifdef CONFIG_OF
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static const struct of_device_id matches[] __initconst = {
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{ .compatible = "nvidia,tegra20-pmc" },
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{ }
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};
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#endif
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void __init tegra_pmc_init(void)
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{
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/*
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* For now, Harmony is the only board that uses the PMC, and it wants
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* the signal inverted. Seaboard would too if it used the PMC.
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* Hopefully by the time other boards want to use the PMC, everything
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* will be device-tree, or they also want it inverted.
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*/
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bool invert_interrupt = true;
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u32 val;
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#ifdef CONFIG_OF
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if (of_have_populated_dt()) {
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struct device_node *np;
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invert_interrupt = false;
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np = of_find_matching_node(NULL, matches);
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if (np) {
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if (of_find_property(np, "nvidia,invert-interrupt",
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NULL))
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invert_interrupt = true;
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}
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}
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#endif
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val = tegra_pmc_readl(PMC_CTRL);
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if (invert_interrupt)
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val |= PMC_CTRL_INTR_LOW;
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else
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val &= ~PMC_CTRL_INTR_LOW;
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tegra_pmc_writel(val, PMC_CTRL);
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}
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