diff options
Diffstat (limited to 'qemu/roms/openbios/drivers/timer.h')
| -rw-r--r-- | qemu/roms/openbios/drivers/timer.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/qemu/roms/openbios/drivers/timer.h b/qemu/roms/openbios/drivers/timer.h new file mode 100644 index 000000000..7e86db3fa --- /dev/null +++ b/qemu/roms/openbios/drivers/timer.h @@ -0,0 +1,62 @@ +/* Taken from Etherboot */ +/* Defines for routines to implement a low-overhead timer for drivers */ + + /* + * 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, or (at + * your option) any later version. + */ + +#ifndef TIMER_H +#define TIMER_H + +/* Ports for the 8254 timer chip */ +#define TIMER2_PORT 0x42 +#define TIMER_MODE_PORT 0x43 + +/* Meaning of the mode bits */ +#define TIMER0_SEL 0x00 +#define TIMER1_SEL 0x40 +#define TIMER2_SEL 0x80 +#define READBACK_SEL 0xC0 + +#define LATCH_COUNT 0x00 +#define LOBYTE_ACCESS 0x10 +#define HIBYTE_ACCESS 0x20 +#define WORD_ACCESS 0x30 + +#define MODE0 0x00 +#define MODE1 0x02 +#define MODE2 0x04 +#define MODE3 0x06 +#define MODE4 0x08 +#define MODE5 0x0A + +#define BINARY_COUNT 0x00 +#define BCD_COUNT 0x01 + +/* Timers tick over at this rate */ +#define CLOCK_TICK_RATE 1193180U +#define TICKS_PER_MS (CLOCK_TICK_RATE/1000) + +/* Parallel Peripheral Controller Port B */ +#define PPC_PORTB 0x61 + +/* Meaning of the port bits */ +#define PPCB_T2OUT 0x20 /* Bit 5 */ +#define PPCB_SPKR 0x02 /* Bit 1 */ +#define PPCB_T2GATE 0x01 /* Bit 0 */ + +extern void ndelay(unsigned int nsecs); +extern void udelay(unsigned int usecs); +extern void mdelay(unsigned int msecs); +extern unsigned long currticks(void); +extern unsigned long get_timer_freq(void); + +/* arch/ppc/timebase.S */ +void _wait_ticks(unsigned long nticks); + +#define TICKS_PER_SEC 1000 + +#endif /* TIMER_H */ |