mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-14 08:57:58 +00:00
74 lines
2 KiB
C
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__ */
|