static void loongson2_cpu_wait(void)
{
unsigned long flags;
u32 cpu_freq;
spin_lock_irqsave(&loongson2_wait_lock, flags);
cpu_freq = LOONGSON_CHIPCFG(0);
LOONGSON_CHIPCFG(0) &= ~0x7; /* Put CPU into wait mode */
LOONGSON_CHIPCFG(0) = cpu_freq; /* Restore CPU state */
spin_unlock_irqrestore(&loongson2_wait_lock, flags);
local_irq_enable();
}
static void reset_cpu(void)
{
/*
* reset cpu to full speed, this is needed when enabling cpu frequency
* scalling
*/
LOONGSON_CHIPCFG(0) |= 0x7;
}
static void loongson_suspend_enter(void)
{
static unsigned int cached_cpu_freq;
/* setup wakeup events via enabling the IRQs */
setup_wakeup_events();
stop_perf_counters();
cached_cpu_freq = LOONGSON_CHIPCFG(0);
/* Put CPU into wait mode */
LOONGSON_CHIPCFG(0) &= ~0x7;
/* wait for the given events to wakeup cpu from wait mode */
wait_for_wakeup_events();
LOONGSON_CHIPCFG(0) = cached_cpu_freq;
mmiowb();
}
/*
* If the events are really what we want to wakeup the CPU, wake it up
* otherwise put the CPU asleep again.
*/
static void wait_for_wakeup_events(void)
{
while (!wakeup_loongson())
LOONGSON_CHIPCFG(0) &= ~0x7;
}