ARM: EXYNOS: Move the driver to drivers/cpuidle directory

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

3 files changed, 106 insertions, 0 deletions

diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 97ccc31dbdd8..695507ae345a 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm
@@ -44,3 +44,9 @@ config ARM_AT91_CPUIDLE
         depends on ARCH_AT91
         help
           Select this to enable cpuidle for AT91 processors
+
+config ARM_EXYNOS_CPUIDLE
+        bool "Cpu Idle Driver for the Exynos processors"
+        depends on ARCH_EXYNOS
+        help
+          Select this to enable cpuidle for Exynos processors
diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
index f71ae1b373c5..0d1540adaf78 100644
--- a/drivers/cpuidle/Makefile
+++ b/drivers/cpuidle/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_ARM_KIRKWOOD_CPUIDLE)	+= cpuidle-kirkwood.o
 obj-$(CONFIG_ARM_ZYNQ_CPUIDLE)          += cpuidle-zynq.o
 obj-$(CONFIG_ARM_U8500_CPUIDLE)         += cpuidle-ux500.o
 obj-$(CONFIG_ARM_AT91_CPUIDLE)          += cpuidle-at91.o
+obj-$(CONFIG_ARM_EXYNOS_CPUIDLE)        += cpuidle-exynos.o
 
 ###############################################################################
 # POWERPC drivers
diff --git a/drivers/cpuidle/cpuidle-exynos.c b/drivers/cpuidle/cpuidle-exynos.c
new file mode 100644
index 000000000000..7c0151263828
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-exynos.c
@@ -0,0 +1,99 @@
+/* linux/arch/arm/mach-exynos/cpuidle.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.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.
+*/
+
+#include <linux/cpuidle.h>
+#include <linux/cpu_pm.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/proc-fns.h>
+#include <asm/suspend.h>
+#include <asm/cpuidle.h>
+
+static void (*exynos_enter_aftr)(void);
+
+static int idle_finisher(unsigned long flags)
+{
+        exynos_enter_aftr();
+        cpu_do_idle();
+
+        return 1;
+}
+
+static int exynos_enter_core0_aftr(struct cpuidle_device *dev,
+                                struct cpuidle_driver *drv,
+                                int index)
+{
+        cpu_pm_enter();
+        cpu_suspend(0, idle_finisher);
+        cpu_pm_exit();
+
+        return index;
+}
+
+static int exynos_enter_lowpower(struct cpuidle_device *dev,
+                                struct cpuidle_driver *drv,
+                                int index)
+{
+        int new_index = index;
+
+        /* AFTR can only be entered when cores other than CPU0 are offline */
+        if (num_online_cpus() > 1 || dev->cpu != 0)
+                new_index = drv->safe_state_index;
+
+        if (new_index == 0)
+                return arm_cpuidle_simple_enter(dev, drv, new_index);
+        else
+                return exynos_enter_core0_aftr(dev, drv, new_index);
+}
+
+static struct cpuidle_driver exynos_idle_driver = {
+        .name                   = "exynos_idle",
+        .owner                  = THIS_MODULE,
+        .states = {
+                [0] = ARM_CPUIDLE_WFI_STATE,
+                [1] = {
+                        .enter                  = exynos_enter_lowpower,
+                        .exit_latency           = 300,
+                        .target_residency       = 100000,
+                        .flags                  = CPUIDLE_FLAG_TIME_VALID,
+                        .name                   = "C1",
+                        .desc                   = "ARM power down",
+                },
+        },
+        .state_count = 2,
+        .safe_state_index = 0,
+};
+
+static int exynos_cpuidle_probe(struct platform_device *pdev)
+{
+        int ret;
+
+        exynos_enter_aftr = (void *)(pdev->dev.platform_data);
+
+        ret = cpuidle_register(&exynos_idle_driver, NULL);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to register cpuidle driver\n");
+                return ret;
+        }
+
+        return 0;
+}
+
+static struct platform_driver exynos_cpuidle_driver = {
+        .probe  = exynos_cpuidle_probe,
+        .driver = {
+                .name = "exynos_cpuidle",
+                .owner = THIS_MODULE,
+        },
+};
+
+module_platform_driver(exynos_cpuidle_driver);