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linux/arch/arm/include/asm/glue-proc.h
Gregory CLEMENT 3e0a07f8c4 ARM: 7773/1: PJ4B: Add support for errata 4742 
This commit fixes the regression on Armada 370 (the kernal hang during
boot) introduced by the commit: "ARM: 7691/1: mm: kill unused
TLB_CAN_READ_FROM_L1_CACHE and use ALT_SMP instead".

When coming out of either a Wait for Interrupt (WFI) or a Wait for
Event (WFE) IDLE states, a specific timing sensitivity exists between
the retiring WFI/WFE instructions and the newly issued subsequent
instructions. This sensitivity can result in a CPU hang scenario.  The
workaround is to insert either a Data Synchronization Barrier (DSB) or
Data Memory Barrier (DMB) command immediately after the WFI/WFE
instruction.

This commit was based on the work of Lior Amsalem, but heavily
modified to apply the errata fix dynamically according to the
processor type thanks to the suggestions of Russell King and Nicolas
Pitre.

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Willy Tarreau <w@1wt.eu>
Cc: <stable@vger.kernel.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-06-24 14:28:46 +01:00

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/*
* arch/arm/include/asm/glue-proc.h
*
* Copyright (C) 1997-1999 Russell King
* Copyright (C) 2000 Deep Blue Solutions Ltd
*
* 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.
*/
#ifndef ASM_GLUE_PROC_H
#define ASM_GLUE_PROC_H
#include <asm/glue.h>
/*
* Work out if we need multiple CPU support
*/
#undef MULTI_CPU
#undef CPU_NAME
/*
* CPU_NAME - the prefix for CPU related functions
*/
#ifdef CONFIG_CPU_ARM7TDMI
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm7tdmi
# endif
#endif
#ifdef CONFIG_CPU_ARM720T
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm720
# endif
#endif
#ifdef CONFIG_CPU_ARM740T
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm740
# endif
#endif
#ifdef CONFIG_CPU_ARM9TDMI
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm9tdmi
# endif
#endif
#ifdef CONFIG_CPU_ARM920T
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm920
# endif
#endif
#ifdef CONFIG_CPU_ARM922T
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm922
# endif
#endif
#ifdef CONFIG_CPU_FA526
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_fa526
# endif
#endif
#ifdef CONFIG_CPU_ARM925T
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm925
# endif
#endif
#ifdef CONFIG_CPU_ARM926T
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm926
# endif
#endif
#ifdef CONFIG_CPU_ARM940T
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm940
# endif
#endif
#ifdef CONFIG_CPU_ARM946E
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm946
# endif
#endif
#ifdef CONFIG_CPU_SA110
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_sa110
# endif
#endif
#ifdef CONFIG_CPU_SA1100
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_sa1100
# endif
#endif
#ifdef CONFIG_CPU_ARM1020
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm1020
# endif
#endif
#ifdef CONFIG_CPU_ARM1020E
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm1020e
# endif
#endif
#ifdef CONFIG_CPU_ARM1022
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm1022
# endif
#endif
#ifdef CONFIG_CPU_ARM1026
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_arm1026
# endif
#endif
#ifdef CONFIG_CPU_XSCALE
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_xscale
# endif
#endif
#ifdef CONFIG_CPU_XSC3
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_xsc3
# endif
#endif
#ifdef CONFIG_CPU_MOHAWK
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_mohawk
# endif
#endif
#ifdef CONFIG_CPU_FEROCEON
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_feroceon
# endif
#endif
#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V6K)
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_v6
# endif
#endif
#ifdef CONFIG_CPU_V7
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_v7
# endif
#endif
#ifdef CONFIG_CPU_PJ4B
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_pj4b
# endif
#endif
#ifndef MULTI_CPU
#define cpu_proc_init __glue(CPU_NAME,_proc_init)
#define cpu_proc_fin __glue(CPU_NAME,_proc_fin)
#define cpu_reset __glue(CPU_NAME,_reset)
#define cpu_do_idle __glue(CPU_NAME,_do_idle)
#define cpu_dcache_clean_area __glue(CPU_NAME,_dcache_clean_area)
#define cpu_do_switch_mm __glue(CPU_NAME,_switch_mm)
#define cpu_set_pte_ext __glue(CPU_NAME,_set_pte_ext)
#define cpu_suspend_size __glue(CPU_NAME,_suspend_size)
#define cpu_do_suspend __glue(CPU_NAME,_do_suspend)
#define cpu_do_resume __glue(CPU_NAME,_do_resume)
#endif
#endif
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