/* * (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 * project. * * 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 of * the License, or (at your option) any later version. * * 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 * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <asm/timer.h> #include <asm/immap.h> DECLARE_GLOBAL_DATA_PTR; static ulong timestamp; #if defined(CONFIG_MCFTMR) #ifndef CFG_UDELAY_BASE # error "uDelay base not defined!" #endif #if !defined(CFG_TMR_BASE) || !defined(CFG_INTR_BASE) || !defined(CFG_TMRINTR_NO) || !defined(CFG_TMRINTR_MASK) # error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!" #endif extern void dtimer_intr_setup(void); void udelay(unsigned long usec) { volatile dtmr_t *timerp = (dtmr_t *) (CFG_UDELAY_BASE); 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->tmr = DTIM_DTMR_RST_RST; timerp->tcn = 0; /* set period to 1 us */ timerp->tmr = CFG_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | DTIM_DTMR_FRR | DTIM_DTMR_RST_EN; start = now = timerp->tcn; while (now < start + tmp) now = timerp->tcn; } } void dtimer_interrupt(void *not_used) { volatile dtmr_t *timerp = (dtmr_t *) (CFG_TMR_BASE); /* check for timer interrupt asserted */ if ((CFG_TMRPND_REG & CFG_TMRINTR_MASK) == CFG_TMRINTR_PEND) { timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF); timestamp++; return; } } void timer_init(void) { volatile dtmr_t *timerp = (dtmr_t *) (CFG_TMR_BASE); timestamp = 0; timerp->tcn = 0; timerp->trr = 0; /* Set up TIMER 4 as clock */ timerp->tmr = DTIM_DTMR_RST_RST; /* initialize and enable timer interrupt */ irq_install_handler(CFG_TMRINTR_NO, dtimer_interrupt, 0); timerp->tcn = 0; timerp->trr = 1000; /* Interrupt every ms */ dtimer_intr_setup(); /* set a period of 1us, set timer mode to restart and enable timer and interrupt */ timerp->tmr = CFG_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | DTIM_DTMR_FRR | DTIM_DTMR_ORRI | DTIM_DTMR_RST_EN; } void reset_timer(void) { timestamp = 0; } ulong get_timer(ulong base) { return (timestamp - base); } void set_timer(ulong t) { timestamp = t; } #endif /* CONFIG_MCFTMR */ #if defined(CONFIG_MCFPIT) #if !defined(CFG_PIT_BASE) # error "CFG_PIT_BASE not defined!" #endif static unsigned short lastinc; void udelay(unsigned long usec) { volatile pit_t *timerp = (pit_t *) (CFG_UDELAY_BASE); uint tmp; while (usec > 0) { if (usec > 65000) tmp = 65000; else tmp = usec; usec = usec - tmp; /* Set up TIMER 3 as timebase clock */ timerp->pcsr = PIT_PCSR_OVW; timerp->pmr = 0; /* set period to 1 us */ timerp->pcsr |= PIT_PCSR_PRE(CFG_PIT_PRESCALE) | PIT_PCSR_EN; timerp->pmr = tmp; while (timerp->pcntr > 0) ; } } void timer_init(void) { volatile pit_t *timerp = (pit_t *) (CFG_PIT_BASE); timestamp = 0; /* Set up TIMER 4 as poll clock */ timerp->pcsr = PIT_PCSR_OVW; timerp->pmr = lastinc = 0; timerp->pcsr |= PIT_PCSR_PRE(CFG_PIT_PRESCALE) | PIT_PCSR_EN; } void set_timer(ulong t) { volatile pit_t *timerp = (pit_t *) (CFG_PIT_BASE); timestamp = 0; timerp->pmr = lastinc = 0; } ulong get_timer(ulong base) { unsigned short now, diff; volatile pit_t *timerp = (pit_t *) (CFG_PIT_BASE); now = timerp->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 /* CONFIG_MCFPIT */ /* * This function is derived from PowerPC code (read timebase as long long). * On M68K it just returns the timer value. */ unsigned long long get_ticks(void) { return get_timer(0); } unsigned long usec2ticks(unsigned long usec) { return get_timer(usec); } /* * This function is derived from PowerPC code (timebase clock frequency). * On M68K it returns the number of timer ticks per second. */ ulong get_tbclk(void) { ulong tbclk; tbclk = CFG_HZ; return tbclk; }