2
* Copyright (C) STMicroelectronics 2009
3
* Copyright (C) ST-Ericsson SA 2010
5
* License Terms: GNU General Public License v2
6
* Based on ARM realview platform
8
* Author: Sundar Iyer <sundar.iyer@stericsson.com>
11
#include <linux/kernel.h>
12
#include <linux/errno.h>
13
#include <linux/smp.h>
15
#include <asm/cacheflush.h>
17
extern volatile int pen_release;
19
static inline void platform_do_lowpower(unsigned int cpu)
23
/* we put the platform to just WFI */
25
__asm__ __volatile__("dsb\n\t" "wfi\n\t"
27
if (pen_release == cpu) {
29
* OK, proper wakeup, we're done
36
int platform_cpu_kill(unsigned int cpu)
42
* platform-specific code to shutdown a CPU
44
* Called with IRQs disabled
46
void platform_cpu_die(unsigned int cpu)
48
/* directly enter low power state, skipping secure registers */
49
platform_do_lowpower(cpu);
52
int platform_cpu_disable(unsigned int cpu)
55
* we don't allow CPU 0 to be shutdown (it is still too special
56
* e.g. clock tick interrupts)
58
return cpu == 0 ? -EPERM : 0;