@@ -10,6 +10,15 @@ struct swsusp_arch_regs {
struct pt_regs user_regs;
unsigned long bank1_regs[8];
};
+
+void sh_mobile_call_standby(unsigned long mode);
+
+#ifdef CONFIG_CPU_IDLE
+void sh_mobile_setup_cpuidle(void);
+#else
+static inline void sh_mobile_setup_cpuidle(void) {}
+#endif
+
#endif
/* flags passed to assembly suspend code */
@@ -4,3 +4,4 @@
# Power Management & Sleep mode
obj-$(CONFIG_PM) += pm.o sleep.o
+obj-$(CONFIG_CPU_IDLE) += cpuidle.o
@@ -0,0 +1,102 @@
+/*
+ * arch/sh/kernel/cpu/shmobile/cpuidle.c
+ *
+ * Cpuidle support code for SuperH Mobile
+ *
+ * Copyright (C) 2009 Magnus Damm
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/suspend.h>
+#include <linux/cpuidle.h>
+#include <asm/suspend.h>
+#include <asm/uaccess.h>
+#include <asm/hwblk.h>
+
+static unsigned long cpuidle_mode[] = {
+ SUSP_SH_SLEEP, /* regular sleep mode */
+ SUSP_SH_SLEEP | SUSP_SH_SF, /* sleep mode + self refresh */
+};
+
+static int cpuidle_sleep_enter(struct cpuidle_device *dev,
+ struct cpuidle_state *state)
+{
+ unsigned long allowed_mode = arch_hwblk_sleep_mode();
+ ktime_t before, after;
+ int requested_state = state - &dev->states[0];
+ int allowed_state;
+ int k;
+
+ /* convert allowed mode to allowed state */
+ for (k = ARRAY_SIZE(cpuidle_mode) - 1; k > 0; k--)
+ if (cpuidle_mode[k] == allowed_mode)
+ break;
+
+ allowed_state = k;
+
+ /* take the following into account for sleep mode selection:
+ * - allowed_state: best mode allowed by hardware (clock deps)
+ * - requested_state: best mode allowed by software (latencies)
+ */
+ k = min_t(int, allowed_state, requested_state);
+
+ dev->last_state = &dev->states[k];
+ before = ktime_get();
+ sh_mobile_call_standby(cpuidle_mode[k]);
+ after = ktime_get();
+ return ktime_to_ns(ktime_sub(after, before)) >> 10;
+}
+
+static struct cpuidle_device cpuidle_dev;
+static struct cpuidle_driver cpuidle_driver = {
+ .name = "sh_idle",
+ .owner = THIS_MODULE,
+};
+
+void sh_mobile_setup_cpuidle(void)
+{
+ struct cpuidle_device *dev = &cpuidle_dev;
+ struct cpuidle_state *state;
+ int i;
+
+ cpuidle_register_driver(&cpuidle_driver);
+
+ for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
+ dev->states[i].name[0] = '\0';
+ dev->states[i].desc[0] = '\0';
+ }
+
+ i = CPUIDLE_DRIVER_STATE_START;
+
+ state = &dev->states[i++];
+ snprintf(state->name, CPUIDLE_NAME_LEN, "C0");
+ strncpy(state->desc, "SuperH Sleep Mode", CPUIDLE_DESC_LEN);
+ state->exit_latency = 1;
+ state->target_residency = 1 * 2;
+ state->power_usage = 3;
+ state->flags = 0;
+ state->flags |= CPUIDLE_FLAG_SHALLOW;
+ state->flags |= CPUIDLE_FLAG_TIME_VALID;
+ state->enter = cpuidle_sleep_enter;
+
+ dev->safe_state = state;
+
+ state = &dev->states[i++];
+ snprintf(state->name, CPUIDLE_NAME_LEN, "C1");
+ strncpy(state->desc, "SuperH Sleep Mode [SF]", CPUIDLE_DESC_LEN);
+ state->exit_latency = 100;
+ state->target_residency = 1 * 2;
+ state->power_usage = 1;
+ state->flags = 0;
+ state->flags |= CPUIDLE_FLAG_TIME_VALID;
+ state->enter = cpuidle_sleep_enter;
+
+ dev->state_count = i;
+
+ cpuidle_register_device(dev);
+}
@@ -1,5 +1,5 @@
/*
- * arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c
+ * arch/sh/kernel/cpu/shmobile/pm.c
*
* Power management support code for SuperH Mobile
*
@@ -32,20 +32,17 @@
*
* R-standby mode is unsupported, but will be added in the future
* U-standby mode is low priority since it needs bootloader hacks
- *
- * All modes should be tied in with cpuidle. But before that can
- * happen we need to keep track of enabled hardware blocks so we
- * can avoid entering sleep modes that stop clocks to hardware
- * blocks that are in use even though the cpu core is idle.
*/
+#define ILRAM_BASE 0xe5200000
+
extern const unsigned char sh_mobile_standby[];
extern const unsigned int sh_mobile_standby_size;
-static void sh_mobile_call_standby(unsigned long mode)
+void sh_mobile_call_standby(unsigned long mode)
{
extern void *vbr_base;
- void *onchip_mem = (void *)0xe5200000; /* ILRAM */
+ void *onchip_mem = (void *)ILRAM_BASE;
void (*standby_onchip_mem)(unsigned long) = onchip_mem;
/* Note: Wake up from sleep may generate exceptions!
@@ -55,11 +52,6 @@ static void sh_mobile_call_standby(unsig
if (mode & SUSP_SH_SF)
asm volatile("ldc %0, vbr" : : "r" (onchip_mem) : "memory");
- /* Copy the assembly snippet to the otherwise ununsed ILRAM */
- memcpy(onchip_mem, sh_mobile_standby, sh_mobile_standby_size);
- wmb();
- ctrl_barrier();
-
/* Let assembly snippet in on-chip memory handle the rest */
standby_onchip_mem(mode);
@@ -85,7 +77,15 @@ static struct platform_suspend_ops sh_pm
static int __init sh_pm_init(void)
{
+ void *onchip_mem = (void *)ILRAM_BASE;
+
+ /* Copy the assembly snippet to the otherwise ununsed ILRAM */
+ memcpy(onchip_mem, sh_mobile_standby, sh_mobile_standby_size);
+ wmb();
+ ctrl_barrier();
+
suspend_set_ops(&sh_pm_ops);
+ sh_mobile_setup_cpuidle();
return 0;
}