1 /* linux arch/arm/mach-exynos4/hotplug.c
3 * Cloned from linux/arch/arm/mach-realview/hotplug.c
5 * Copyright (C) 2002 ARM Ltd.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/smp.h>
18 #include <asm/cacheflush.h>
20 #include <asm/smp_plat.h>
25 static inline void cpu_leave_lowpower(void)
30 "mrc p15, 0, %0, c1, c0, 0\n"
32 " mcr p15, 0, %0, c1, c0, 0\n"
33 " mrc p15, 0, %0, c1, c0, 1\n"
35 " mcr p15, 0, %0, c1, c0, 1\n"
37 : "Ir" (CR_C), "Ir" (0x40)
41 static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
45 /* make cpu1 to be turned off at next WFI command */
47 exynos_cpu_power_down(cpu);
51 if (pen_release == cpu_logical_map(cpu)) {
53 * OK, proper wakeup, we're done
59 * Getting here, means that we have come out of WFI without
60 * having been woken up - this shouldn't happen
62 * Just note it happening - when we're woken, we can report
70 * platform-specific code to shutdown a CPU
72 * Called with IRQs disabled
74 void __ref exynos_cpu_die(unsigned int cpu)
78 v7_exit_coherency_flush(louis);
80 platform_do_lowpower(cpu, &spurious);
83 * bring this CPU back into the world of cache
84 * coherency, and then restore interrupts
89 pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);