projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | } |