summaryrefslogtreecommitdiff
path: root/drivers/cpuidle/cpuidle-arm.c
diff options
context:
space:
mode:
authorDaniel Lezcano <daniel.lezcano@linaro.org>2015-02-02 18:32:46 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2015-03-24 12:16:11 +0300
commit0e0870448aa134e91fafe3c39ae270561b495459 (patch)
tree9f8c5154749c5b59729ad9e681ad3c4395b9a2af /drivers/cpuidle/cpuidle-arm.c
parent69e6cb3d2f356a5c88abf18a8d266c31a74cfc08 (diff)
downloadlinux-0e0870448aa134e91fafe3c39ae270561b495459.tar.xz
ARM: cpuidle: Enable the ARM64 driver for both ARM32/ARM64
ARM32 and ARM64 have the same DT definitions and the same approaches. The generic ARM cpuidle driver can be put in common for those two architectures. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Kevin Hilman <khilman@linaro.org> Acked-by: Rob Herring <robherring2@gmail.com> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Diffstat (limited to 'drivers/cpuidle/cpuidle-arm.c')
-rw-r--r--drivers/cpuidle/cpuidle-arm.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
new file mode 100644
index 000000000000..1c94b88a7a7d
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-arm.c
@@ -0,0 +1,122 @@
+/*
+ * ARM/ARM64 generic CPU idle driver.
+ *
+ * Copyright (C) 2014 ARM Ltd.
+ * Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#define pr_fmt(fmt) "CPUidle arm: " fmt
+
+#include <linux/cpuidle.h>
+#include <linux/cpumask.h>
+#include <linux/cpu_pm.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+
+#include <asm/cpuidle.h>
+
+#include "dt_idle_states.h"
+
+/*
+ * arm_enter_idle_state - Programs CPU to enter the specified state
+ *
+ * dev: cpuidle device
+ * drv: cpuidle driver
+ * idx: state index
+ *
+ * Called from the CPUidle framework to program the device to the
+ * specified target state selected by the governor.
+ */
+static int arm_enter_idle_state(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int idx)
+{
+ int ret;
+
+ if (!idx) {
+ cpu_do_idle();
+ return idx;
+ }
+
+ ret = cpu_pm_enter();
+ if (!ret) {
+ /*
+ * Pass idle state index to cpu_suspend which in turn will
+ * call the CPU ops suspend protocol with idle index as a
+ * parameter.
+ */
+ arm_cpuidle_suspend(idx);
+
+ cpu_pm_exit();
+ }
+
+ return ret ? -1 : idx;
+}
+
+static struct cpuidle_driver arm_idle_driver = {
+ .name = "arm_idle",
+ .owner = THIS_MODULE,
+ /*
+ * State at index 0 is standby wfi and considered standard
+ * on all ARM platforms. If in some platforms simple wfi
+ * can't be used as "state 0", DT bindings must be implemented
+ * to work around this issue and allow installing a special
+ * handler for idle state index 0.
+ */
+ .states[0] = {
+ .enter = arm_enter_idle_state,
+ .exit_latency = 1,
+ .target_residency = 1,
+ .power_usage = UINT_MAX,
+ .name = "WFI",
+ .desc = "ARM WFI",
+ }
+};
+
+static const struct of_device_id arm_idle_state_match[] __initconst = {
+ { .compatible = "arm,idle-state",
+ .data = arm_enter_idle_state },
+ { },
+};
+
+/*
+ * arm_idle_init
+ *
+ * Registers the arm specific cpuidle driver with the cpuidle
+ * framework. It relies on core code to parse the idle states
+ * and initialize them using driver data structures accordingly.
+ */
+static int __init arm_idle_init(void)
+{
+ int cpu, ret;
+ struct cpuidle_driver *drv = &arm_idle_driver;
+
+ /*
+ * Initialize idle states data, starting at index 1.
+ * This driver is DT only, if no DT idle states are detected (ret == 0)
+ * let the driver initialization fail accordingly since there is no
+ * reason to initialize the idle driver if only wfi is supported.
+ */
+ ret = dt_init_idle_driver(drv, arm_idle_state_match, 1);
+ if (ret <= 0)
+ return ret ? : -ENODEV;
+
+ /*
+ * Call arch CPU operations in order to initialize
+ * idle states suspend back-end specific data
+ */
+ for_each_possible_cpu(cpu) {
+ ret = arm_cpuidle_init(cpu);
+ if (ret) {
+ pr_err("CPU %d failed to init idle CPU ops\n", cpu);
+ return ret;
+ }
+ }
+
+ return cpuidle_register(drv, NULL);
+}
+device_initcall(arm_idle_init);