diff options
Diffstat (limited to 'include/asm-i386/mach-default/mach_timer.h')
| -rw-r--r-- | include/asm-i386/mach-default/mach_timer.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/include/asm-i386/mach-default/mach_timer.h b/include/asm-i386/mach-default/mach_timer.h new file mode 100644 index 000000000000..4b9703bb0288 --- /dev/null +++ b/include/asm-i386/mach-default/mach_timer.h @@ -0,0 +1,48 @@ +/* + * include/asm-i386/mach-default/mach_timer.h + * + * Machine specific calibrate_tsc() for generic. + * Split out from timer_tsc.c by Osamu Tomita <tomita@cinet.co.jp> + */ +/* ------ Calibrate the TSC ------- + * Return 2^32 * (1 / (TSC clocks per usec)) for do_fast_gettimeoffset(). + * Too much 64-bit arithmetic here to do this cleanly in C, and for + * accuracy's sake we want to keep the overhead on the CTC speaker (channel 2) + * output busy loop as low as possible. We avoid reading the CTC registers + * directly because of the awkward 8-bit access mechanism of the 82C54 + * device. + */ +#ifndef _MACH_TIMER_H +#define _MACH_TIMER_H + +#define CALIBRATE_LATCH (5 * LATCH) + +static inline void mach_prepare_counter(void) +{ + /* Set the Gate high, disable speaker */ + outb((inb(0x61) & ~0x02) | 0x01, 0x61); + + /* + * Now let's take care of CTC channel 2 + * + * Set the Gate high, program CTC channel 2 for mode 0, + * (interrupt on terminal count mode), binary count, + * load 5 * LATCH count, (LSB and MSB) to begin countdown. + * + * Some devices need a delay here. + */ + outb(0xb0, 0x43); /* binary, mode 0, LSB/MSB, Ch 2 */ + outb_p(CALIBRATE_LATCH & 0xff, 0x42); /* LSB of count */ + outb_p(CALIBRATE_LATCH >> 8, 0x42); /* MSB of count */ +} + +static inline void mach_countup(unsigned long *count_p) +{ + unsigned long count = 0; + do { + count++; + } while ((inb_p(0x61) & 0x20) == 0); + *count_p = count; +} + +#endif /* !_MACH_TIMER_H */ |