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Message-Id: <1327594923-21822-4-git-send-email-pdeschrijver@nvidia.com>
Date: Thu, 26 Jan 2012 18:22:03 +0200
From: Peter De Schrijver <pdeschrijver@...dia.com>
To: Peter De Schrijver <pdeschrijver@...dia.com>
Cc: Colin Cross <ccross@...roid.com>, Olof Johansson <olof@...om.net>,
Stephen Warren <swarren@...dia.com>,
Russell King <linux@....linux.org.uk>,
linux-tegra@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v1 3/3] ARM: tegra: cpuidle driver for tegra
CPUidle driver for tegra. In this version only LP3 (clockgating) is supported.
Based on work by:
Colin Cross <ccross@...roid.com>
Gary King <gking@...dia.com>
Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
---
arch/arm/mach-tegra/Makefile | 2 +
arch/arm/mach-tegra/cpuidle.c | 107 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 109 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-tegra/cpuidle.c
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index b78bda8..c06c280 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -6,6 +6,8 @@ obj-y += irq.o
obj-y += clock.o
obj-y += timer.o
obj-y += fuse.o
+obj-y += cpuidle.o
+obj-y += sleep.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/cpuidle.c b/arch/arm/mach-tegra/cpuidle.c
new file mode 100644
index 0000000..d83a8c0
--- /dev/null
+++ b/arch/arm/mach-tegra/cpuidle.c
@@ -0,0 +1,107 @@
+/*
+ * arch/arm/mach-tegra/cpuidle.c
+ *
+ * CPU idle driver for Tegra CPUs
+ *
+ * Copyright (c) 2010-2012, NVIDIA Corporation.
+ * Copyright (c) 2011 Google, Inc.
+ * Author: Colin Cross <ccross@...roid.com>
+ * Gary King <gking@...dia.com>
+ *
+ * Rework for 3.3 by Peter De Schrijver <pdeschrijver@...dia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/cpu.h>
+#include <linux/cpuidle.h>
+#include <linux/hrtimer.h>
+
+#include <mach/iomap.h>
+
+extern void tegra_cpu_wfi(void);
+
+static int tegra_idle_enter_lp3(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index);
+
+struct cpuidle_driver tegra_idle_driver = {
+ .name = "tegra_idle",
+ .owner = THIS_MODULE,
+ .state_count = 1,
+ .states = {
+ [0] = {
+ .enter = tegra_idle_enter_lp3,
+ .exit_latency = 10,
+ .target_residency = 10,
+ .power_usage = 600,
+ .flags = CPUIDLE_FLAG_TIME_VALID,
+ .name = "LP3",
+ .desc = "CPU flow-controlled",
+ },
+ },
+};
+
+static DEFINE_PER_CPU(struct cpuidle_device, tegra_idle_device);
+
+static int tegra_idle_enter_lp3(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ ktime_t enter, exit;
+ s64 us;
+
+ local_irq_disable();
+ local_fiq_disable();
+
+ enter = ktime_get();
+
+ tegra_cpu_wfi();
+
+ exit = ktime_sub(ktime_get(), enter);
+ us = ktime_to_us(exit);
+
+ local_fiq_enable();
+ local_irq_enable();
+
+ dev->last_residency = us;
+
+ return index;
+}
+
+static int __init tegra_cpuidle_init(void)
+{
+ int ret;
+ unsigned int cpu;
+ struct cpuidle_device *dev;
+ struct cpuidle_driver *drv = &tegra_idle_driver;
+
+ ret = cpuidle_register_driver(&tegra_idle_driver);
+ if (ret) {
+ pr_err("CPUidle driver registration failed\n");
+ return ret;
+ }
+
+ for_each_possible_cpu(cpu) {
+ dev = &per_cpu(tegra_idle_device, cpu);
+ dev->cpu = cpu;
+
+ dev->state_count = drv->state_count;
+ ret = cpuidle_register_device(dev);
+ if (ret) {
+ pr_err("CPU%u: CPUidle device registration failed\n",
+ cpu);
+ return ret;
+ }
+ }
+ return 0;
+}
+device_initcall(tegra_cpuidle_init);
--
1.7.7.rc0.72.g4b5ea.dirty
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