blob: 0df7a2c1fc3dc9873b21b55ae8fe3846e2e03d14 [file] [log] [blame]
* Copyright 2011 Calxeda, Inc.
* Based on PPC version Copyright 2007 MontaVista Software, Inc.
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <>.
#ifndef ASM_EDAC_H
#define ASM_EDAC_H
* ECC atomic, DMA, SMP and interrupt safe scrub function.
* Implements the per arch atomic_scrub() that EDAC use for software
* ECC scrubbing. It reads memory and then writes back the original
* value, allowing the hardware to detect and correct memory errors.
static inline void atomic_scrub(void *va, u32 size)
#if __LINUX_ARM_ARCH__ >= 6
unsigned int *virt_addr = va;
unsigned int temp, temp2;
unsigned int i;
for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) {
/* Very carefully read and write to memory atomically
* so we are interrupt, DMA and SMP safe.
__asm__ __volatile__("\n"
"1: ldrex %0, [%2]\n"
" strex %1, %0, [%2]\n"
" teq %1, #0\n"
" bne 1b\n"
: "=&r"(temp), "=&r"(temp2)
: "r"(virt_addr)
: "cc");