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9f1890a5 JO |
1 | /* |
2 | * Copyright (C) 2002 ARM Ltd. | |
3 | * All Rights Reserved | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/smp.h> | |
12 | ||
eb50439b | 13 | #include <asm/smp_plat.h> |
9f1890a5 | 14 | |
be2109e1 | 15 | #include "common.h" |
44ea349f | 16 | |
9f1890a5 JO |
17 | static inline void cpu_enter_lowpower(void) |
18 | { | |
9f1890a5 JO |
19 | } |
20 | ||
21 | static inline void cpu_leave_lowpower(void) | |
22 | { | |
23 | } | |
24 | ||
25 | static inline void platform_do_lowpower(unsigned int cpu) | |
26 | { | |
27 | /* Just enter wfi for now. TODO: Properly shut off the cpu. */ | |
28 | for (;;) { | |
29 | /* | |
30 | * here's the WFI | |
31 | */ | |
32 | asm("wfi" | |
33 | : | |
34 | : | |
35 | : "memory", "cc"); | |
36 | ||
1d3cfb34 | 37 | if (pen_release == cpu_logical_map(cpu)) { |
9f1890a5 JO |
38 | /* |
39 | * OK, proper wakeup, we're done | |
40 | */ | |
41 | break; | |
42 | } | |
43 | ||
44 | /* | |
45 | * getting here, means that we have come out of WFI without | |
46 | * having been woken up - this shouldn't happen | |
47 | * | |
48 | * The trouble is, letting people know about this is not really | |
49 | * possible, since we are currently running incoherently, and | |
50 | * therefore cannot safely call printk() or anything else | |
51 | */ | |
52 | pr_debug("CPU%u: spurious wakeup call\n", cpu); | |
53 | } | |
54 | } | |
55 | ||
9f1890a5 JO |
56 | /* |
57 | * platform-specific code to shutdown a CPU | |
58 | * | |
59 | * Called with IRQs disabled | |
60 | */ | |
44ea349f | 61 | void __ref msm_cpu_die(unsigned int cpu) |
9f1890a5 JO |
62 | { |
63 | /* | |
64 | * we're ready for shutdown now, so do it | |
65 | */ | |
66 | cpu_enter_lowpower(); | |
67 | platform_do_lowpower(cpu); | |
68 | ||
69 | /* | |
70 | * bring this CPU back into the world of cache | |
71 | * coherency, and then restore interrupts | |
72 | */ | |
73 | cpu_leave_lowpower(); | |
74 | } |