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/*
* arch/arm/mach-tegra/delay.S
*
* Copyright (C) 2010 Google, Inc.
*
* Author:
* Colin Cross <ccross@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
#include <mach/iomap.h>
#include <mach/io.h>
#include "asm_macros.h"
.text
ENTRY(__udelay)
ENTRY(__const_udelay)
mov32 r3, (IO_PPSB_VIRT + TEGRA_TMRUS_BASE - IO_PPSB_PHYS)
ldr r1, [r3]
/* r0 - usecs to wait
* r1 - initial value of the counter
*/
loop:
ldr r2, [r3]
sub r2, r2, r1
cmp r2, r0
bls loop
mov pc, lr
ENDPROC(__const_udelay)
ENDPROC(__udelay)
@ Delay routine
ENTRY(__delay)
subs r0, r0, #1
bhi __delay
mov pc, lr
ENDPROC(__delay)
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