diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/include/asm/delay.h')
-rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/include/asm/delay.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/include/asm/delay.h b/target/linux/ubicom32/files/arch/ubicom32/include/asm/delay.h new file mode 100644 index 0000000000..0e5025c463 --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/include/asm/delay.h @@ -0,0 +1,75 @@ +/* + * 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 */ |