From d3b8bdd5f9bc538fb17466cbb7af43209b55cb93 Mon Sep 17 00:00:00 2001
From: Stephen Warren <swarren@nvidia.com>
Date: Wed, 25 Jan 2012 14:43:28 -0700
Subject: [PATCH] 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>
---
arch/arm/mach-tegra/Makefile | 1 +
arch/arm/mach-tegra/common.c | 3 ++
arch/arm/mach-tegra/pmc.c | 76 ++++++++++++++++++++++++++++++++++++
arch/arm/mach-tegra/pmc.h | 23 +++++++++++
4 files changed, 103 insertions(+)
create mode 100644 arch/arm/mach-tegra/pmc.c
create mode 100644 arch/arm/mach-tegra/pmc.h
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 23d15fba3843..e0b7a4d32599 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -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
diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 76210e5df561..43da4284d862 100644
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -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
diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
new file mode 100644
index 000000000000..7af6a54404be
--- /dev/null
+++ b/arch/arm/mach-tegra/pmc.c
@@ -0,0 +1,76 @@
+/*
+ * 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);
+}
diff --git a/arch/arm/mach-tegra/pmc.h b/arch/arm/mach-tegra/pmc.h
new file mode 100644
index 000000000000..8995ee4a8768
--- /dev/null
+++ b/arch/arm/mach-tegra/pmc.h
@@ -0,0 +1,23 @@
+/*
+ * 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
--
2.34.1