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Annotation of qemu/roms/openbios/drivers/timer.h, revision 1.1.1.1

1.1       root        1: /* Taken from Etherboot */
                      2: /* Defines for routines to implement a low-overhead timer for drivers */
                      3: 
                      4:  /*
                      5:  * This program is free software; you can redistribute it and/or
                      6:  * modify it under the terms of the GNU General Public License as
                      7:  * published by the Free Software Foundation; either version 2, or (at
                      8:  * your option) any later version.
                      9:  */
                     10: 
                     11: #ifndef        TIMER_H
                     12: #define TIMER_H
                     13: 
                     14: /* Ports for the 8254 timer chip */
                     15: #define        TIMER2_PORT     0x42
                     16: #define        TIMER_MODE_PORT 0x43
                     17: 
                     18: /* Meaning of the mode bits */
                     19: #define        TIMER0_SEL      0x00
                     20: #define        TIMER1_SEL      0x40
                     21: #define        TIMER2_SEL      0x80
                     22: #define        READBACK_SEL    0xC0
                     23: 
                     24: #define        LATCH_COUNT     0x00
                     25: #define        LOBYTE_ACCESS   0x10
                     26: #define        HIBYTE_ACCESS   0x20
                     27: #define        WORD_ACCESS     0x30
                     28: 
                     29: #define        MODE0           0x00
                     30: #define        MODE1           0x02
                     31: #define        MODE2           0x04
                     32: #define        MODE3           0x06
                     33: #define        MODE4           0x08
                     34: #define        MODE5           0x0A
                     35: 
                     36: #define        BINARY_COUNT    0x00
                     37: #define        BCD_COUNT       0x01
                     38: 
                     39: /* Timers tick over at this rate */
                     40: #define CLOCK_TICK_RATE        1193180U
                     41: #define        TICKS_PER_MS    (CLOCK_TICK_RATE/1000)
                     42: 
                     43: /* Parallel Peripheral Controller Port B */
                     44: #define        PPC_PORTB       0x61
                     45: 
                     46: /* Meaning of the port bits */
                     47: #define        PPCB_T2OUT      0x20    /* Bit 5 */
                     48: #define        PPCB_SPKR       0x02    /* Bit 1 */
                     49: #define        PPCB_T2GATE     0x01    /* Bit 0 */
                     50: 
                     51: extern void ndelay(unsigned int nsecs);
                     52: extern void udelay(unsigned int usecs);
                     53: extern void mdelay(unsigned int msecs);
                     54: extern unsigned long currticks(void);
                     55: extern unsigned long get_timer_freq(void);
                     56: 
                     57: /* arch/ppc/timebase.S */
                     58: void _wait_ticks(unsigned long nticks);
                     59: 
                     60: #define TICKS_PER_SEC 1000
                     61: 
                     62: #endif /* TIMER_H */

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