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Diffstat (limited to 'include/asm-sparc/delay.h')
| -rw-r--r-- | include/asm-sparc/delay.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/include/asm-sparc/delay.h b/include/asm-sparc/delay.h new file mode 100644 index 000000000..d6c4b360e --- /dev/null +++ b/include/asm-sparc/delay.h @@ -0,0 +1,40 @@ +#ifndef __SPARC_DELAY_H +#define __SPARC_DELAY_H + +extern unsigned long loops_per_sec; + +/* + * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu). + * + * Delay quick inlined code using 'loops_per_second' which is + * calculated in calibrate_delay() in main.c (ie. BogoMIPS :-) + */ + +extern __inline__ void __delay(unsigned int loops) +{ + __asm__ __volatile__("\n1:\tcmp %0, 0\n\t" + "bne,a 1b\n\t" + "sub %0, 1, %0\n": "=&r" (loops) : "0" (loops)); +} + +/* udelay(usecs) is used for very short delays up to 1 millisecond. */ + +extern __inline__ void udelay(unsigned int usecs) +{ + usecs *= 0x000010c6; /* Sparc is 32-bit just like ix86 */ + + __asm__("sethi %hi(_loops_per_sec), %o1\n\t" + "ld [%o1 + %lo(_loops_per_sec)], %o1\n\t" + "call ___delay\n\t" + "umul %o1, %o0, %o0\n\t"); +} + +/* calibrate_delay() wants this... */ + +extern __inline__ unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c) +{ + return ((a*b)/c); +} + +#endif /* defined(__SPARC_DELAY_H) */ + |