mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
4a66b5d980
Without this exiting WFI can result in cache corruption. Code taken from Freescale's 2.6.27 BSP and tested on i.MX35 Signed-off-by: Eric Bénard <eric@eukrea.com>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/*
|
|
* Copyright (C) 1999 ARM Limited
|
|
* Copyright (C) 2000 Deep Blue Solutions Ltd
|
|
* Copyright 2004-2008 Freescale Semiconductor, Inc. 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 as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that 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.
|
|
*/
|
|
|
|
#ifndef __ASM_ARCH_MXC_SYSTEM_H__
|
|
#define __ASM_ARCH_MXC_SYSTEM_H__
|
|
|
|
#include <mach/hardware.h>
|
|
#include <mach/common.h>
|
|
|
|
static inline void arch_idle(void)
|
|
{
|
|
#ifdef CONFIG_ARCH_MXC91231
|
|
if (cpu_is_mxc91231()) {
|
|
/* Need this to set DSM low-power mode */
|
|
mxc91231_prepare_idle();
|
|
}
|
|
#endif
|
|
/* fix i.MX31 errata TLSbo65953 and i.MX35 errata ENGcm09472 */
|
|
if (cpu_is_mx31() || cpu_is_mx35()) {
|
|
unsigned long reg = 0;
|
|
__asm__ __volatile__(
|
|
/* disable I and D cache */
|
|
"mrc p15, 0, %0, c1, c0, 0\n"
|
|
"bic %0, %0, #0x00001000\n"
|
|
"bic %0, %0, #0x00000004\n"
|
|
"mcr p15, 0, %0, c1, c0, 0\n"
|
|
/* invalidate I cache */
|
|
"mov %0, #0\n"
|
|
"mcr p15, 0, %0, c7, c5, 0\n"
|
|
/* clear and invalidate D cache */
|
|
"mov %0, #0\n"
|
|
"mcr p15, 0, %0, c7, c14, 0\n"
|
|
/* WFI */
|
|
"mov %0, #0\n"
|
|
"mcr p15, 0, %0, c7, c0, 4\n"
|
|
"nop\n" "nop\n" "nop\n" "nop\n"
|
|
"nop\n" "nop\n" "nop\n"
|
|
/* enable I and D cache */
|
|
"mrc p15, 0, %0, c1, c0, 0\n"
|
|
"orr %0, %0, #0x00001000\n"
|
|
"orr %0, %0, #0x00000004\n"
|
|
"mcr p15, 0, %0, c1, c0, 0\n"
|
|
: "=r" (reg));
|
|
} else
|
|
cpu_do_idle();
|
|
}
|
|
|
|
void arch_reset(char mode, const char *cmd);
|
|
|
|
#endif /* __ASM_ARCH_MXC_SYSTEM_H__ */
|