diff options
Diffstat (limited to 'include/asm-ppc/delay.h')
-rw-r--r-- | include/asm-ppc/delay.h | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/include/asm-ppc/delay.h b/include/asm-ppc/delay.h deleted file mode 100644 index badde6845af2..000000000000 --- a/include/asm-ppc/delay.h +++ /dev/null @@ -1,66 +0,0 @@ -#ifdef __KERNEL__ -#ifndef _PPC_DELAY_H -#define _PPC_DELAY_H - -#include <asm/param.h> - -/* - * Copyright 1996, Paul Mackerras. - * - * 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. - */ - -extern unsigned long loops_per_jiffy; - -extern void __delay(unsigned int loops); - -/* - * Note that 19 * 226 == 4294 ==~ 2^32 / 10^6, so - * loops = (4294 * usecs * loops_per_jiffy * HZ) / 2^32. - * - * The mulhwu instruction gives us loops = (a * b) / 2^32. - * We choose a = usecs * 19 * HZ and b = loops_per_jiffy * 226 - * because this lets us support a wide range of HZ and - * loops_per_jiffy values without either a or b overflowing 2^32. - * Thus we need usecs * HZ <= (2^32 - 1) / 19 = 226050910 and - * loops_per_jiffy <= (2^32 - 1) / 226 = 19004280 - * (which corresponds to ~3800 bogomips at HZ = 100). - * -- paulus - */ -#define __MAX_UDELAY (226050910UL/HZ) /* maximum udelay argument */ -#define __MAX_NDELAY (4294967295UL/HZ) /* maximum ndelay argument */ - -extern __inline__ void __udelay(unsigned int x) -{ - unsigned int loops; - - __asm__("mulhwu %0,%1,%2" : "=r" (loops) : - "r" (x), "r" (loops_per_jiffy * 226)); - __delay(loops); -} - -extern __inline__ void __ndelay(unsigned int x) -{ - unsigned int loops; - - __asm__("mulhwu %0,%1,%2" : "=r" (loops) : - "r" (x), "r" (loops_per_jiffy * 5)); - __delay(loops); -} - -extern void __bad_udelay(void); /* deliberately undefined */ -extern void __bad_ndelay(void); /* deliberately undefined */ - -#define udelay(n) (__builtin_constant_p(n)? \ - ((n) > __MAX_UDELAY? __bad_udelay(): __udelay((n) * (19 * HZ))) : \ - __udelay((n) * (19 * HZ))) - -#define ndelay(n) (__builtin_constant_p(n)? \ - ((n) > __MAX_NDELAY? __bad_ndelay(): __ndelay((n) * HZ)) : \ - __ndelay((n) * HZ)) - -#endif /* defined(_PPC_DELAY_H) */ -#endif /* __KERNEL__ */ |