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/*
* Copyright (C) STMicroelectronics 2009
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
* Based on ARM realview platform
*
* Author: Sundar Iyer <sundar.iyer@stericsson.com>
*
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <asm/cacheflush.h>
#ifdef CONFIG_U8500_CPUIDLE
#include "pm/cpuidle.h"
#else
#define ux500_cpuidle_unplug(cpu)
#define ux500_cpuidle_plug(cpu)
#endif
#include "pm/context.h"
extern volatile int pen_release;
static inline void platform_do_lowpower(unsigned int cpu)
{
flush_cache_all();
ux500_cpuidle_unplug(cpu);
for (;;) {
#ifndef CONFIG_U8500_CPUIDLE
__asm__ __volatile__("dsb\n\t" "wfi\n\t"
: : : "memory");
#endif
context_varm_save_core();
context_save_cpu_registers();
context_save_to_sram_and_wfi(false);
context_restore_cpu_registers();
context_varm_restore_core();
/* we put the platform to just WFI */
for (;;) {
__asm__ __volatile__("dsb\n\t" "wfi\n\t"
: : : "memory");
if (pen_release == cpu) {
/*
* OK, proper wakeup, we're done
*/
break;
}
}
}
int platform_cpu_kill(unsigned int cpu)
{
return 1;
}
/*
* platform-specific code to shutdown a CPU
*
* Called with IRQs disabled
*/
void platform_cpu_die(unsigned int cpu)
{
/* directly enter low power state, skipping secure registers */
platform_do_lowpower(cpu);
}
int platform_cpu_disable(unsigned int cpu)
{
/*
* we don't allow CPU 0 to be shutdown (it is still too special
* e.g. clock tick interrupts)
*/
return cpu == 0 ? -EPERM : 0;
}
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