Rev 424 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 424 | giacomo | 1 | /* |
| 2 | * include/asm-i386/mach-pc9800/mach_timer.h |
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| 3 | * |
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| 4 | * Machine specific calibrate_tsc() for PC-9800. |
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| 5 | * Written by Osamu Tomita <tomita@cinet.co.jp> |
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| 6 | */ |
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| 7 | /* ------ Calibrate the TSC ------- |
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| 8 | * PC-9800: |
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| 9 | * CTC cannot be used because some models (especially |
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| 10 | * note-machines) may disable clock to speaker channel (#1) |
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| 11 | * unless speaker is enabled. We use ARTIC instead. |
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| 12 | */ |
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| 13 | #ifndef _MACH_TIMER_H |
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| 14 | #define _MACH_TIMER_H |
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| 15 | |||
| 16 | #define CALIBRATE_LATCH (5 * 307200/HZ) /* 0.050sec * 307200Hz = 15360 */ |
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| 17 | |||
| 18 | static inline void mach_prepare_counter(void) |
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| 19 | { |
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| 20 | /* ARTIC can't be stopped nor reset. So we wait roundup. */ |
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| 21 | while (inw(0x5c)); |
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| 22 | } |
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| 23 | |||
| 24 | static inline void mach_countup(unsigned long *count) |
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| 25 | { |
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| 26 | do { |
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| 27 | *count = inw(0x5c); |
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| 28 | } while (*count < CALIBRATE_LATCH); |
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| 29 | } |
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| 30 | |||
| 31 | #endif /* !_MACH_TIMER_H */ |