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- #include <linux/init.h>
- #include <linux/cpuidle.h>
- #include <linux/spinlock.h>
- #include <linux/atomic.h>
- #include <linux/smp.h>
- #include <linux/mfd/dbx500-prcmu.h>
- #include <linux/platform_data/arm-ux500-pm.h>
- #include <linux/platform_device.h>
- #include <asm/cpuidle.h>
- static atomic_t master = ATOMIC_INIT(0);
- static DEFINE_SPINLOCK(master_lock);
- static inline int ux500_enter_idle(struct cpuidle_device *dev,
- struct cpuidle_driver *drv, int index)
- {
- int this_cpu = smp_processor_id();
- bool recouple = false;
- if (atomic_inc_return(&master) == num_online_cpus()) {
-
- if (!spin_trylock(&master_lock))
- goto wfi;
-
- if (prcmu_gic_decouple()) {
- spin_unlock(&master_lock);
- goto out;
- }
-
- recouple = true;
-
- if (!prcmu_is_cpu_in_wfi(this_cpu ? 0 : 1))
- goto out;
-
- if (prcmu_copy_gic_settings())
- goto out;
-
- if (prcmu_gic_pending_irq())
- goto out;
-
- if (prcmu_pending_irq())
- goto out;
-
- if (prcmu_set_power_state(PRCMU_AP_IDLE, true, true))
- goto out;
-
- recouple = false;
- spin_unlock(&master_lock);
- }
- wfi:
- cpu_do_idle();
- out:
- atomic_dec(&master);
- if (recouple) {
- prcmu_gic_recouple();
- spin_unlock(&master_lock);
- }
- return index;
- }
- static struct cpuidle_driver ux500_idle_driver = {
- .name = "ux500_idle",
- .owner = THIS_MODULE,
- .states = {
- ARM_CPUIDLE_WFI_STATE,
- {
- .enter = ux500_enter_idle,
- .exit_latency = 70,
- .target_residency = 260,
- .flags = CPUIDLE_FLAG_TIMER_STOP,
- .name = "ApIdle",
- .desc = "ARM Retention",
- },
- },
- .safe_state_index = 0,
- .state_count = 2,
- };
- static int dbx500_cpuidle_probe(struct platform_device *pdev)
- {
-
- prcmu_enable_wakeups(PRCMU_WAKEUP(ARM) | PRCMU_WAKEUP(RTC) |
- PRCMU_WAKEUP(ABB));
- return cpuidle_register(&ux500_idle_driver, NULL);
- }
- static struct platform_driver dbx500_cpuidle_plat_driver = {
- .driver = {
- .name = "cpuidle-dbx500",
- },
- .probe = dbx500_cpuidle_probe,
- };
- builtin_platform_driver(dbx500_cpuidle_plat_driver);
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