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: Stephen Warren <swarren@nvidia.com> Signed-off-by: Olof Johansson <olof@lixom.net>
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@ -7,6 +7,7 @@ obj-y += clock.o
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obj-y += timer.o
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obj-y += pinmux.o
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obj-y += fuse.o
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obj-y += pmc.o
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obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += powergate.o
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obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra2_clocks.o
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obj-$(CONFIG_ARCH_TEGRA_2x_SOC) += tegra2_emc.o
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@ -32,6 +32,7 @@
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#include "board.h"
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#include "clock.h"
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#include "fuse.h"
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#include "pmc.h"
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/*
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* Storage for debug-macro.S's state.
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@ -117,11 +118,13 @@ void __init tegra20_init_early(void)
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tegra2_init_clocks();
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tegra_clk_init_from_table(tegra20_clk_init_table);
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tegra_init_cache(0x331, 0x441);
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tegra_pmc_init();
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}
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#endif
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#ifdef CONFIG_ARCH_TEGRA_3x_SOC
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void __init tegra30_init_early(void)
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{
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tegra_init_cache(0x441, 0x551);
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tegra_pmc_init();
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}
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#endif
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@ -0,0 +1,76 @@
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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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@ -0,0 +1,23 @@
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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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#ifndef __MACH_TEGRA_PMC_H
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#define __MACH_TEGRA_PMC_H
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void tegra_pmc_init(void);
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#endif
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