mirror of
https://github.com/torvalds/linux.git
synced 2024-11-06 20:21:57 +00:00
b522877b53
zynq_platform_do_lowpower() does never return. Hence remove all code which relies on that function returning and consolidate the remains. Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
60 lines
1.2 KiB
C
60 lines
1.2 KiB
C
/*
|
|
* Copyright (C) 2012-2013 Xilinx
|
|
*
|
|
* based on 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/cacheflush.h>
|
|
#include <asm/cp15.h>
|
|
#include "common.h"
|
|
|
|
static inline void zynq_cpu_enter_lowpower(void)
|
|
{
|
|
unsigned int v;
|
|
|
|
flush_cache_all();
|
|
asm volatile(
|
|
" mcr p15, 0, %1, c7, c5, 0\n"
|
|
" dsb\n"
|
|
/*
|
|
* Turn off coherency
|
|
*/
|
|
" mrc p15, 0, %0, c1, c0, 1\n"
|
|
" bic %0, %0, #0x40\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)
|
|
: "cc");
|
|
}
|
|
|
|
/*
|
|
* platform-specific code to shutdown a CPU
|
|
*
|
|
* Called with IRQs disabled
|
|
*/
|
|
void zynq_platform_cpu_die(unsigned int cpu)
|
|
{
|
|
zynq_cpu_enter_lowpower();
|
|
|
|
/*
|
|
* 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 (;;)
|
|
cpu_do_idle();
|
|
}
|