summaryrefslogtreecommitdiff
path: root/drivers/cpuidle
diff options
context:
space:
mode:
authorAlexander Shiyan <shc_work@mail.ru>2014-03-22 09:44:35 +0400
committerDaniel Lezcano <daniel.lezcano@linaro.org>2014-04-30 03:33:02 +0400
commit7c7f8f7f2c6bf078874e5de35d7e2c66467fc664 (patch)
treef9f3c87cd6c245f0b4ce6cfdad8ac7f3ff57f7ce /drivers/cpuidle
parentd1db0eea852497762cab43b905b879dfcd3b8987 (diff)
downloadlinux-7c7f8f7f2c6bf078874e5de35d7e2c66467fc664.tar.xz
ARM: clps711x: Add cpuidle driver
Add cpuidle support for ARM Cirrus Logic CLPS711X CPUs. This CPU has an unique internal register and write to this location will put the system into the Idle State by halting the clock to the processor until an interrupt is generated. Signed-off-by: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/Kconfig.arm6
-rw-r--r--drivers/cpuidle/Makefile1
-rw-r--r--drivers/cpuidle/cpuidle-clps711x.c64
3 files changed, 71 insertions, 0 deletions
diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 97ccc31dbdd8..371e75d2348d 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm
@@ -13,6 +13,12 @@ config ARM_BIG_LITTLE_CPUIDLE
define different C-states for little and big cores through the
multiple CPU idle drivers infrastructure.
+config ARM_CLPS711X_CPUIDLE
+ bool "CPU Idle Driver for CLPS711X processors"
+ depends on ARCH_CLPS711X || COMPILE_TEST
+ help
+ Select this to enable cpuidle on Cirrus Logic CLPS711X SOCs.
+
config ARM_HIGHBANK_CPUIDLE
bool "CPU Idle Driver for Calxeda processors"
depends on ARM_PSCI
diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
index f71ae1b373c5..534fff575823 100644
--- a/drivers/cpuidle/Makefile
+++ b/drivers/cpuidle/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o
##################################################################################
# ARM SoC drivers
obj-$(CONFIG_ARM_BIG_LITTLE_CPUIDLE) += cpuidle-big_little.o
+obj-$(CONFIG_ARM_CLPS711X_CPUIDLE) += cpuidle-clps711x.o
obj-$(CONFIG_ARM_HIGHBANK_CPUIDLE) += cpuidle-calxeda.o
obj-$(CONFIG_ARM_KIRKWOOD_CPUIDLE) += cpuidle-kirkwood.o
obj-$(CONFIG_ARM_ZYNQ_CPUIDLE) += cpuidle-zynq.o
diff --git a/drivers/cpuidle/cpuidle-clps711x.c b/drivers/cpuidle/cpuidle-clps711x.c
new file mode 100644
index 000000000000..5243811daa6e
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-clps711x.c
@@ -0,0 +1,64 @@
+/*
+ * CLPS711X CPU idle driver
+ *
+ * Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
+ *
+ * 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.
+ */
+
+#include <linux/cpuidle.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#define CLPS711X_CPUIDLE_NAME "clps711x-cpuidle"
+
+static void __iomem *clps711x_halt;
+
+static int clps711x_cpuidle_halt(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ writel(0xaa, clps711x_halt);
+
+ return index;
+}
+
+static struct cpuidle_driver clps711x_idle_driver = {
+ .name = CLPS711X_CPUIDLE_NAME,
+ .owner = THIS_MODULE,
+ .states[0] = {
+ .name = "HALT",
+ .desc = "CLPS711X HALT",
+ .enter = clps711x_cpuidle_halt,
+ .exit_latency = 1,
+ },
+ .state_count = 1,
+};
+
+static int __init clps711x_cpuidle_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ clps711x_halt = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(clps711x_halt))
+ return PTR_ERR(clps711x_halt);
+
+ return cpuidle_register(&clps711x_idle_driver, NULL);
+}
+
+static struct platform_driver clps711x_cpuidle_driver = {
+ .driver = {
+ .name = CLPS711X_CPUIDLE_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+module_platform_driver_probe(clps711x_cpuidle_driver, clps711x_cpuidle_probe);
+
+MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
+MODULE_DESCRIPTION("CLPS711X CPU idle driver");
+MODULE_LICENSE("GPL");