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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1998, 1999, 2003 by Ralf Baechle
*/
#ifndef _ASM_TIMEX_H
#define _ASM_TIMEX_H
#ifdef __KERNEL__
#include <asm/cpu-features.h>
#include <asm/mipsregs.h>
#include <asm/cpu-type.h>
/*
* This is the clock rate of the i8253 PIT. A MIPS system may not have
* a PIT by the symbol is used all over the kernel including some APIs.
* So keeping it defined to the number for the PIT is the only sane thing
* for now.
*/
#define CLOCK_TICK_RATE 1193182
/*
* Standard way to access the cycle counter.
* Currently only used on SMP for scheduling.
*
* Only the low 32 bits are available as a continuously counting entity.
* But this only means we'll force a reschedule every 8 seconds or so,
* which isn't an evil thing.
*
* We know that all SMP capable CPUs have cycle counters.
*/
typedef unsigned int cycles_t;
/*
* On R4000/R4400 before version 5.0 an erratum exists such that if the
* cycle counter is read in the exact moment that it is matching the
* compare register, no interrupt will be generated.
*
* There is a suggested workaround and also the erratum can't strike if
* the compare interrupt isn't being used as the clock source device.
* However for now the implementaton of this function doesn't get these
* fine details right.
*/
static inline cycles_t get_cycles(void)
{
switch (boot_cpu_type()) {
case CPU_R4400PC:
case CPU_R4400SC:
case CPU_R4400MC:
if ((read_c0_prid() & 0xff) >= 0x0050)
return read_c0_count();
break;
case CPU_R4000PC:
case CPU_R4000SC:
case CPU_R4000MC:
break;
default:
if (cpu_has_counter)
return read_c0_count();
break;
}
return 0; /* no usable counter */
}
#endif /* __KERNEL__ */
#endif /* _ASM_TIMEX_H */