Release 4.11 arch/arm/mach-vexpress/hotplug.c
/*
* linux/arch/arm/mach-realview/hotplug.c
*
* Copyright (C) 2002 ARM Ltd.
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <asm/smp_plat.h>
#include <asm/cp15.h>
#include "core.h"
static inline void cpu_enter_lowpower(void)
{
unsigned int v;
asm volatile(
"mcr p15, 0, %1, c7, c5, 0\n"
" mcr p15, 0, %1, c7, c10, 4\n"
/*
* Turn off coherency
*/
" mrc p15, 0, %0, c1, c0, 1\n"
" bic %0, %0, %3\n"
" mcr p15, 0, %0, c1, c0, 1\n"
" mrc p15, 0, %0, c1, c0, 0\n"
" bic %0, %0, %2\n"
" mcr p15, 0, %0, c1, c0, 0\n"
: "=&r" (v)
: "r" (0), "Ir" (CR_C), "Ir" (0x40)
: "cc");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 18 | 100.00% | 1 | 100.00% |
| Total | 18 | 100.00% | 1 | 100.00% |
static inline void cpu_leave_lowpower(void)
{
unsigned int v;
asm volatile(
"mrc p15, 0, %0, c1, c0, 0\n"
" orr %0, %0, %1\n"
" mcr p15, 0, %0, c1, c0, 0\n"
" mrc p15, 0, %0, c1, c0, 1\n"
" orr %0, %0, %2\n"
" mcr p15, 0, %0, c1, c0, 1\n"
: "=&r" (v)
: "Ir" (CR_C), "Ir" (0x40)
: "cc");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 16 | 100.00% | 1 | 100.00% |
| Total | 16 | 100.00% | 1 | 100.00% |
static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
{
/*
* there is no power-control hardware on this platform, so all
* we can do is put the core into WFI; this is safe as the calling
* code will have already disabled interrupts
*/
for (;;) {
wfi();
if (pen_release == cpu_logical_map(cpu)) {
/*
* OK, proper wakeup, we're done
*/
break;
}
/*
* Getting here, means that we have come out of WFI without
* having been woken up - this shouldn't happen
*
* Just note it happening - when we're woken, we can report
* its occurrence.
*/
(*spurious)++;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 40 | 86.96% | 1 | 33.33% |
| Will Deacon | 3 | 6.52% | 1 | 33.33% |
| Nick Bowler | 3 | 6.52% | 1 | 33.33% |
| Total | 46 | 100.00% | 3 | 100.00% |
/*
* platform-specific code to shutdown a CPU
*
* Called with IRQs disabled
*/
void vexpress_cpu_die(unsigned int cpu)
{
int spurious = 0;
/*
* we're ready for shutdown now, so do it
*/
cpu_enter_lowpower();
platform_do_lowpower(cpu, &spurious);
/*
* bring this CPU back into the world of cache
* coherency, and then restore interrupts
*/
cpu_leave_lowpower();
if (spurious)
pr_warn("CPU%u: %u spurious wakeup calls\n", cpu, spurious);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 42 | 97.67% | 1 | 50.00% |
| Marc Zyngier | 1 | 2.33% | 1 | 50.00% |
| Total | 43 | 100.00% | 2 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Russell King | 130 | 90.91% | 2 | 28.57% |
| Will Deacon | 6 | 4.20% | 2 | 28.57% |
| Ben Dooks | 3 | 2.10% | 1 | 14.29% |
| Nick Bowler | 3 | 2.10% | 1 | 14.29% |
| Marc Zyngier | 1 | 0.70% | 1 | 14.29% |
| Total | 143 | 100.00% | 7 | 100.00% |
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