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c7c28b0f MS |
1 | /* |
2 | * Copyright (C) 2012-2013 Xilinx | |
3 | * | |
4 | * based on linux/arch/arm/mach-realview/hotplug.c | |
5 | * | |
6 | * Copyright (C) 2002 ARM Ltd. | |
7 | * All Rights Reserved | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/smp.h> | |
16 | ||
17 | #include <asm/cacheflush.h> | |
18 | #include <asm/cp15.h> | |
19 | #include "common.h" | |
20 | ||
21 | static inline void zynq_cpu_enter_lowpower(void) | |
22 | { | |
23 | unsigned int v; | |
24 | ||
25 | flush_cache_all(); | |
26 | asm volatile( | |
27 | " mcr p15, 0, %1, c7, c5, 0\n" | |
28 | " dsb\n" | |
29 | /* | |
30 | * Turn off coherency | |
31 | */ | |
32 | " mrc p15, 0, %0, c1, c0, 1\n" | |
33 | " bic %0, %0, #0x40\n" | |
34 | " mcr p15, 0, %0, c1, c0, 1\n" | |
35 | " mrc p15, 0, %0, c1, c0, 0\n" | |
36 | " bic %0, %0, %2\n" | |
37 | " mcr p15, 0, %0, c1, c0, 0\n" | |
38 | : "=&r" (v) | |
39 | : "r" (0), "Ir" (CR_C) | |
40 | : "cc"); | |
41 | } | |
42 | ||
c7c28b0f MS |
43 | /* |
44 | * platform-specific code to shutdown a CPU | |
45 | * | |
46 | * Called with IRQs disabled | |
47 | */ | |
48 | void zynq_platform_cpu_die(unsigned int cpu) | |
49 | { | |
c7c28b0f | 50 | zynq_cpu_enter_lowpower(); |
c7c28b0f MS |
51 | |
52 | /* | |
b522877b SB |
53 | * there is no power-control hardware on this platform, so all |
54 | * we can do is put the core into WFI; this is safe as the calling | |
55 | * code will have already disabled interrupts | |
c7c28b0f | 56 | */ |
b522877b SB |
57 | for (;;) |
58 | cpu_do_idle(); | |
c7c28b0f | 59 | } |