u-boot/arch/arm/include/asm/macro.h
Peter Tyser 819833af39 Move architecture-specific includes to arch/$ARCH/include/asm
This helps to clean up the include/ directory so that it only contains
non-architecture-specific headers and also matches Linux's directory
layout which many U-Boot developers are already familiar with.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
2010-04-13 09:13:12 +02:00

74 lines
2 KiB
C

/*
* include/asm-arm/macro.h
*
* Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef __ASM_ARM_MACRO_H__
#define __ASM_ARM_MACRO_H__
#ifdef __ASSEMBLY__
/*
* These macros provide a convenient way to write 8, 16 and 32 bit data
* to any address.
* Registers r4 and r5 are used, any data in these registers are
* overwritten by the macros.
* The macros are valid for any ARM architecture, they do not implement
* any memory barriers so caution is recommended when using these when the
* caches are enabled or on a multi-core system.
*/
.macro write32, addr, data
ldr r4, =\addr
ldr r5, =\data
str r5, [r4]
.endm
.macro write16, addr, data
ldr r4, =\addr
ldrh r5, =\data
strh r5, [r4]
.endm
.macro write8, addr, data
ldr r4, =\addr
ldrb r5, =\data
strb r5, [r4]
.endm
/*
* This macro generates a loop that can be used for delays in the code.
* Register r4 is used, any data in this register is overwritten by the
* macro.
* The macro is valid for any ARM architeture. The actual time spent in the
* loop will vary from CPU to CPU though.
*/
.macro wait_timer, time
ldr r4, =\time
1:
nop
subs r4, r4, #1
bcs 1b
.endm
#endif /* __ASSEMBLY__ */
#endif /* __ASM_ARM_MACRO_H__ */