Commit | Line | Data |
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7d30e8b3 | 1 | /* linux arch/arm/mach-exynos4/hotplug.c |
11adcc29 CY |
2 | * |
3 | * Cloned from linux/arch/arm/mach-realview/hotplug.c | |
4 | * | |
5 | * Copyright (C) 2002 ARM Ltd. | |
6 | * All Rights Reserved | |
7 | * | |
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. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/smp.h> | |
911c29b0 | 16 | #include <linux/io.h> |
11adcc29 CY |
17 | |
18 | #include <asm/cacheflush.h> | |
15d07dc9 | 19 | #include <asm/cp15.h> |
eb50439b | 20 | #include <asm/smp_plat.h> |
11adcc29 | 21 | |
06853ae4 | 22 | #include "common.h" |
65c9a853 | 23 | #include "regs-pmu.h" |
06853ae4 | 24 | |
11adcc29 CY |
25 | static inline void cpu_leave_lowpower(void) |
26 | { | |
27 | unsigned int v; | |
28 | ||
29 | asm volatile( | |
30 | "mrc p15, 0, %0, c1, c0, 0\n" | |
e3d9c625 | 31 | " orr %0, %0, %1\n" |
11adcc29 CY |
32 | " mcr p15, 0, %0, c1, c0, 0\n" |
33 | " mrc p15, 0, %0, c1, c0, 1\n" | |
ad849a22 | 34 | " orr %0, %0, %2\n" |
11adcc29 CY |
35 | " mcr p15, 0, %0, c1, c0, 1\n" |
36 | : "=&r" (v) | |
ad849a22 | 37 | : "Ir" (CR_C), "Ir" (0x40) |
11adcc29 CY |
38 | : "cc"); |
39 | } | |
40 | ||
d4450261 | 41 | static inline void platform_do_lowpower(unsigned int cpu, int *spurious) |
11adcc29 | 42 | { |
11adcc29 | 43 | for (;;) { |
911c29b0 JM |
44 | |
45 | /* make cpu1 to be turned off at next WFI command */ | |
46 | if (cpu == 1) | |
664ba443 | 47 | exynos_cpu_power_down(cpu); |
911c29b0 | 48 | |
b92ad209 | 49 | wfi(); |
11adcc29 | 50 | |
2f41c36b | 51 | if (pen_release == cpu_logical_map(cpu)) { |
11adcc29 CY |
52 | /* |
53 | * OK, proper wakeup, we're done | |
54 | */ | |
55 | break; | |
56 | } | |
57 | ||
58 | /* | |
d4450261 | 59 | * Getting here, means that we have come out of WFI without |
11adcc29 CY |
60 | * having been woken up - this shouldn't happen |
61 | * | |
d4450261 RK |
62 | * Just note it happening - when we're woken, we can report |
63 | * its occurrence. | |
11adcc29 | 64 | */ |
d4450261 | 65 | (*spurious)++; |
11adcc29 CY |
66 | } |
67 | } | |
68 | ||
11adcc29 CY |
69 | /* |
70 | * platform-specific code to shutdown a CPU | |
71 | * | |
72 | * Called with IRQs disabled | |
73 | */ | |
06853ae4 | 74 | void __ref exynos_cpu_die(unsigned int cpu) |
11adcc29 | 75 | { |
d4450261 RK |
76 | int spurious = 0; |
77 | ||
75ad2ab2 | 78 | v7_exit_coherency_flush(louis); |
756e46db | 79 | |
d4450261 | 80 | platform_do_lowpower(cpu, &spurious); |
11adcc29 CY |
81 | |
82 | /* | |
83 | * bring this CPU back into the world of cache | |
84 | * coherency, and then restore interrupts | |
85 | */ | |
86 | cpu_leave_lowpower(); | |
d4450261 RK |
87 | |
88 | if (spurious) | |
89 | pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious); | |
11adcc29 | 90 | } |