diff options
Diffstat (limited to 'lib_m68k/time.c')
| -rw-r--r-- | lib_m68k/time.c | 168 |
1 files changed, 127 insertions, 41 deletions
diff --git a/lib_m68k/time.c b/lib_m68k/time.c index 5fc2751..0b85411 100644 --- a/lib_m68k/time.c +++ b/lib_m68k/time.c @@ -1,5 +1,7 @@ /* - * (C) Copyright 2000-2003 + * (C) Copyright 2003 Josef Baumgartner <josef.baumgartner@telex.de> + * + * (C) Copyright 2000 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * See file CREDITS for list of people who contributed to this @@ -12,7 +14,7 @@ * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License @@ -23,65 +25,149 @@ #include <common.h> +#include <asm/mcftimer.h> + +#ifdef CONFIG_M5272 +#include <asm/m5272.h> +#include <asm/immap_5272.h> +#endif + +#ifdef CONFIG_M5282 +#include <asm/m5282.h> +#endif + + +static ulong timestamp; +#ifdef CONFIG_M5282 +static unsigned short lastinc; +#endif -/* ------------------------------------------------------------------------- */ +#if defined(CONFIG_M5272) /* - * This function is intended for SHORT delays only. - * It will overflow at around 10 seconds @ 400MHz, - * or 20 seconds @ 200MHz. + * We use timer 3 which is running with a period of 1 us */ -unsigned long usec2ticks(unsigned long usec) +void udelay(unsigned long usec) { - ulong ticks; + volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE3); + uint start, now, tmp; + + while (usec > 0) { + if (usec > 65000) + tmp = 65000; + else + tmp = usec; + usec = usec - tmp; + + /* Set up TIMER 3 as timebase clock */ + timerp->timer_tmr = MCFTIMER_TMR_DISABLE; + timerp->timer_tcn = 0; + /* set period to 1 us */ + timerp->timer_tmr = (((CFG_CLK / 1000000) - 1) << 8) | MCFTIMER_TMR_CLK1 | + MCFTIMER_TMR_FREERUN | MCFTIMER_TMR_ENABLE; + + start = now = timerp->timer_tcn; + while (now < start + tmp) + now = timerp->timer_tcn; + } +} + +void mcf_timer_interrupt (void * not_used){ + volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE4); + volatile intctrl_t *intp = (intctrl_t *) (CFG_MBAR + MCFSIM_ICR1); - if (usec < 1000) { - ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000; - } else { - ticks = ((usec / 10) * (get_tbclk() / 100000)); + /* check for timer 4 interrupts */ + if ((intp->int_isr & 0x01000000) != 0) { + return; } - return (ticks); + /* reset timer */ + timerp->timer_ter = MCFTIMER_TER_CAP | MCFTIMER_TER_REF; + timestamp ++; } -/* ------------------------------------------------------------------------- */ +void timer_init (void) { + volatile timer_t *timerp = (timer_t *) (CFG_MBAR + MCFTIMER_BASE4); + volatile intctrl_t *intp = (intctrl_t *) (CFG_MBAR + MCFSIM_ICR1); -/* - * We implement the delay by converting the delay (the number of - * microseconds to wait) into a number of time base ticks; then we - * watch the time base until it has incremented by that amount. - */ -void udelay(unsigned long usec) + timestamp = 0; + + /* Set up TIMER 4 as clock */ + timerp->timer_tmr = MCFTIMER_TMR_DISABLE; + + /* initialize and enable timer 4 interrupt */ + irq_install_handler (72, mcf_timer_interrupt, 0); + intp->int_icr1 |= 0x0000000d; + + timerp->timer_tcn = 0; + timerp->timer_trr = 1000; /* Interrupt every ms */ + /* set a period of 1us, set timer mode to restart and enable timer and interrupt */ + timerp->timer_tmr = (((CFG_CLK / 1000000) - 1) << 8) | MCFTIMER_TMR_CLK1 | + MCFTIMER_TMR_RESTART | MCFTIMER_TMR_ENORI | MCFTIMER_TMR_ENABLE; +} + +void reset_timer (void) { - ulong ticks = usec2ticks (usec); + timestamp = 0; +} - wait_ticks (ticks); +ulong get_timer (ulong base) +{ + return (timestamp - base); } -/* ------------------------------------------------------------------------- */ +void set_timer (ulong t) +{ + timestamp = t; +} +#endif -unsigned long ticks2usec(unsigned long ticks) +#if defined(CONFIG_M5282) + +void udelay(unsigned long usec) { - ulong tbclk = get_tbclk(); - - /* usec = ticks * 1000000 / tbclk - * Multiplication would overflow at ~4.2e3 ticks, - * so we break it up into - * usec = ( ( ticks * 1000) / tbclk ) * 1000; - */ - ticks *= 1000L; - ticks /= tbclk; - ticks *= 1000L; - - return ((ulong)ticks); } -/* ------------------------------------------------------------------------- */ +void timer_init (void) +{ + volatile unsigned short *timerp; + + timerp = (volatile unsigned short *) (CFG_MBAR + MCFTIMER_BASE4); + timestamp = 0; + + /* Set up TIMER 4 as poll clock */ + timerp[MCFTIMER_PCSR] = MCFTIMER_PCSR_OVW; + timerp[MCFTIMER_PMR] = lastinc = 0; + timerp[MCFTIMER_PCSR] = + (5 << 8) | MCFTIMER_PCSR_EN | MCFTIMER_PCSR_OVW; +} -int init_timebase (void) +void set_timer (ulong t) { - /* FIXME!! */ - return 0; + volatile unsigned short *timerp; + + timerp = (volatile unsigned short *) (CFG_MBAR + MCFTIMER_BASE4); + timestamp = 0; + timerp[MCFTIMER_PMR] = lastinc = 0; +} + +ulong get_timer (ulong base) +{ + unsigned short now, diff; + volatile unsigned short *timerp; + + timerp = (volatile unsigned short *) (CFG_MBAR + MCFTIMER_BASE4); + now = timerp[MCFTIMER_PCNTR]; + diff = -(now - lastinc); + + timestamp += diff; + lastinc = now; + return timestamp - base; } -/* ------------------------------------------------------------------------- */ +void wait_ticks (unsigned long ticks) +{ + set_timer (0); + while (get_timer (0) < ticks); +} +#endif |