100 lines
2 KiB
C
100 lines
2 KiB
C
/*
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* OpenBIOS native timer driver
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*
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* (C) 2004 Stefan Reinauer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2
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*
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*/
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#include "config.h"
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#include "drivers/drivers.h"
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#include "timer.h"
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#include "asm/io.h"
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#if defined(CONFIG_X86) || defined(CONFIG_AMD64)
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void setup_timers(void)
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{
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/* nothing to do */
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}
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static void load_timer2(unsigned int ticks)
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{
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/* Set up the timer gate, turn off the speaker */
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outb((inb(PPC_PORTB) & ~PPCB_SPKR) | PPCB_T2GATE, PPC_PORTB);
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outb(TIMER2_SEL | WORD_ACCESS | MODE0 | BINARY_COUNT,
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TIMER_MODE_PORT);
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outb(ticks & 0xFF, TIMER2_PORT);
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outb(ticks >> 8, TIMER2_PORT);
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}
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void udelay(unsigned int usecs)
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{
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load_timer2((usecs * TICKS_PER_MS) / 1000);
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while ((inb(PPC_PORTB) & PPCB_T2OUT) == 0);
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}
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unsigned long currticks(void)
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{
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static unsigned long totticks = 0UL; /* High resolution */
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unsigned long ticks = 0;
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unsigned char portb = inb(PPC_PORTB);
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/*
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* Read the timer, and hope it hasn't wrapped around
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* (call this again within 54ms), then restart it
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*/
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outb(TIMER2_SEL | LATCH_COUNT, TIMER_MODE_PORT);
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ticks = inb(TIMER2_PORT);
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ticks |= inb(TIMER2_PORT) << 8;
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outb(TIMER2_SEL | WORD_ACCESS | MODE0 | BINARY_COUNT,
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TIMER_MODE_PORT);
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outb(0, TIMER2_PORT);
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outb(0, TIMER2_PORT);
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/*
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* Check if the timer was running. If not,
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* result is rubbish and need to start it
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*/
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if (portb & PPCB_T2GATE) {
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totticks += (0x10000 - ticks);
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} else {
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/* Set up the timer gate, turn off the speaker */
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outb((portb & ~PPCB_SPKR) | PPCB_T2GATE, PPC_PORTB);
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}
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return totticks / TICKS_PER_MS;
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}
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#endif
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#ifdef CONFIG_PPC
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void setup_timers(void)
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{
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/* nothing to do */
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}
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/*
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* TODO: pass via lb table
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*/
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unsigned long timer_freq = 10000000 / 4;
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void udelay(unsigned int usecs)
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{
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unsigned long ticksperusec = timer_freq / 1000000;
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_wait_ticks(ticksperusec * usecs);
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}
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#endif
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void ndelay(unsigned int nsecs)
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{
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udelay((nsecs + 999) / 1000);
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}
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void mdelay(unsigned int msecs)
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{
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udelay(msecs * 1000);
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}
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