ARM: S3C64XX: Add basic cpuidle driver

Add a very basic cpuidle driver for S3C64xx which merely drives the CPU
into IDLE mode. We could do this with pm_idle but the more modern idiom
is to use cpuidle and the intention is to go further and support STOP
and DEEP-STOP states in conjunction with the pm_domain framework.

The actual state entry code was lifted from Tomasz Figa's work on spica.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

2 files changed, 92 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c64xx/Makefile b/arch/arm/mach-s3c64xx/Makefile
index 1822ac2eba3..610fe2807ed 100644
--- a/arch/arm/mach-s3c64xx/Makefile
+++ b/arch/arm/mach-s3c64xx/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_CPU_S3C6410)	+= s3c6410.o
 # PM
 
 obj-$(CONFIG_PM)                += pm.o irq-pm.o sleep.o
+obj-$(CONFIG_CPU_IDLE)          += cpuidle.o
 
 # DMA support
 
diff --git a/arch/arm/mach-s3c64xx/cpuidle.c b/arch/arm/mach-s3c64xx/cpuidle.c
new file mode 100644
index 00000000000..625d2c7b454
--- /dev/null
+++ b/arch/arm/mach-s3c64xx/cpuidle.c
@@ -0,0 +1,91 @@
+/* linux/arch/arm/mach-s3c64xx/cpuidle.c
+ *
+ * Copyright (c) 2011 Wolfson Microelectronics, plc
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/cpuidle.h>
+#include <linux/io.h>
+#include <linux/export.h>
+#include <linux/time.h>
+
+#include <asm/proc-fns.h>
+
+#include <mach/map.h>
+
+#include <mach/regs-sys.h>
+#include <mach/regs-syscon-power.h>
+
+static int s3c64xx_enter_idle(struct cpuidle_device *dev,
+                              struct cpuidle_driver *drv,
+                              int index)
+{
+        struct timeval before, after;
+        unsigned long tmp;
+        int idle_time;
+
+        local_irq_disable();
+        do_gettimeofday(&before);
+
+        /* Setup PWRCFG to enter idle mode */
+        tmp = __raw_readl(S3C64XX_PWR_CFG);
+        tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
+        tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
+        __raw_writel(tmp, S3C64XX_PWR_CFG);
+
+        cpu_do_idle();
+
+        do_gettimeofday(&after);
+        local_irq_enable();
+        idle_time = (after.tv_sec - before.tv_sec) * USEC_PER_SEC +
+                    (after.tv_usec - before.tv_usec);
+
+        dev->last_residency = idle_time;
+        return index;
+}
+
+static struct cpuidle_state s3c64xx_cpuidle_set[] = {
+        [0] = {
+                .enter                  = s3c64xx_enter_idle,
+                .exit_latency           = 1,
+                .target_residency       = 100000,
+                .flags                  = CPUIDLE_FLAG_TIME_VALID,
+                .name                   = "IDLE",
+                .desc                   = "System active, ARM gated",
+        },
+};
+
+static struct cpuidle_driver s3c64xx_cpuidle_driver = {
+        .name           = "s3c64xx_cpuidle",
+        .owner          = THIS_MODULE,
+        .state_count    = ARRAY_SIZE(s3c64xx_cpuidle_set),
+};
+
+static struct cpuidle_device s3c64xx_cpuidle_device = {
+        .state_count    = ARRAY_SIZE(s3c64xx_cpuidle_set),
+};
+
+static int __init s3c64xx_init_cpuidle(void)
+{
+        int ret;
+
+        memcpy(s3c64xx_cpuidle_driver.states, s3c64xx_cpuidle_set,
+               sizeof(s3c64xx_cpuidle_set));
+        cpuidle_register_driver(&s3c64xx_cpuidle_driver);
+
+        ret = cpuidle_register_device(&s3c64xx_cpuidle_device);
+        if (ret) {
+                pr_err("Failed to register cpuidle device: %d\n", ret);
+                return ret;
+        }
+
+        return 0;
+}
+device_initcall(s3c64xx_init_cpuidle);