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>
22 #include <mach/regs-pmu.h>
26 static inline void cpu_enter_lowpower(void)
32 " mcr p15, 0, %1, c7, c5, 0\n"
33 " mcr p15, 0, %1, c7, c10, 4\n"
37 " mrc p15, 0, %0, c1, c0, 1\n"
39 " mcr p15, 0, %0, c1, c0, 1\n"
40 " mrc p15, 0, %0, c1, c0, 0\n"
42 " mcr p15, 0, %0, c1, c0, 0\n"
44 : "r" (0), "Ir" (CR_C), "Ir" (0x40)
48 static inline void cpu_leave_lowpower(void)
53 "mrc p15, 0, %0, c1, c0, 0\n"
55 " mcr p15, 0, %0, c1, c0, 0\n"
56 " mrc p15, 0, %0, c1, c0, 1\n"
58 " mcr p15, 0, %0, c1, c0, 1\n"
60 : "Ir" (CR_C), "Ir" (0x40)
64 static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
68 /* make cpu1 to be turned off at next WFI command */
70 __raw_writel(0, S5P_ARM_CORE1_CONFIGURATION);
75 asm(".word 0xe320f003\n"
80 if (pen_release == cpu_logical_map(cpu)) {
82 * OK, proper wakeup, we're done
88 * Getting here, means that we have come out of WFI without
89 * having been woken up - this shouldn't happen
91 * Just note it happening - when we're woken, we can report
99 * platform-specific code to shutdown a CPU
101 * Called with IRQs disabled
103 void __ref exynos_cpu_die(unsigned int cpu)
108 * we're ready for shutdown now, so do it
110 cpu_enter_lowpower();
111 platform_do_lowpower(cpu, &spurious);
114 * bring this CPU back into the world of cache
115 * coherency, and then restore interrupts
117 cpu_leave_lowpower();
120 pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);