mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2025-04-21 12:27:27 +03:00
1a29ef8e97
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19815 3c298f89-4303-0410-b956-a3cf2f4a3e73
76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
|
|
* arch/ubicom32/include/asm/delay.h
|
|
* Definition of delay routines for Ubicom32 architecture.
|
|
*
|
|
* (C) Copyright 2009, Ubicom, Inc.
|
|
*
|
|
* This file is part of the Ubicom32 Linux Kernel Port.
|
|
*
|
|
* The Ubicom32 Linux Kernel Port 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.
|
|
*
|
|
* The Ubicom32 Linux Kernel Port 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 the Ubicom32 Linux Kernel Port. If not,
|
|
* see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* Ubicom32 implementation derived from (with many thanks):
|
|
* arch/m68knommu
|
|
* arch/blackfin
|
|
* arch/parisc
|
|
*/
|
|
#ifndef _ASM_UBICOM32_DELAY_H
|
|
#define _ASM_UBICOM32_DELAY_H
|
|
|
|
#include <asm/param.h>
|
|
#include <asm/ip5000.h>
|
|
|
|
static inline void __delay(unsigned long loops)
|
|
{
|
|
if (loops == 0) {
|
|
return;
|
|
}
|
|
|
|
asm volatile (
|
|
"1: add.4 %0, #-1, %0 \n\t"
|
|
" jmpne.t 1b \n\t"
|
|
: "+d" (loops)
|
|
);
|
|
}
|
|
|
|
/*
|
|
* Ubicom32 processor uses fixed 12MHz external OSC.
|
|
* So we use that as reference to count 12 cycles/us
|
|
*/
|
|
|
|
extern unsigned long loops_per_jiffy;
|
|
|
|
static inline void _udelay(unsigned long usecs)
|
|
{
|
|
#if defined(CONFIG_UBICOM32_V4) || defined(CONFIG_UBICOM32_V3)
|
|
asm volatile (
|
|
" add.4 d15, 0(%0), %1 \n\t"
|
|
" sub.4 #0, 0(%0), d15 \n\t"
|
|
" jmpmi.w.f .-4 \n\t"
|
|
:
|
|
: "a"(TIMER_BASE + TIMER_MPTVAL), "d"(usecs * (12000000/1000000))
|
|
: "d15"
|
|
);
|
|
#else
|
|
BUG();
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Moved the udelay() function into library code, no longer inlined.
|
|
*/
|
|
extern void udelay(unsigned long usecs);
|
|
|
|
#endif /* _ASM_UBICOM32_DELAY_H */
|