From 570c0186aecab1b747b2d44d0e1d3c1ac4cb27f5 Mon Sep 17 00:00:00 2001 From: TsiChungLiew Date: Tue, 15 Jan 2008 13:37:34 -0600 Subject: ColdFire: Add MCF547x_8x cpu arch Signed-off-by: TsiChungLiew Signed-off by: John Rigby --- cpu/mcf547x_8x/slicetimer.c | 112 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 112 insertions(+) create mode 100644 cpu/mcf547x_8x/slicetimer.c (limited to 'cpu/mcf547x_8x/slicetimer.c') diff --git a/cpu/mcf547x_8x/slicetimer.c b/cpu/mcf547x_8x/slicetimer.c new file mode 100644 index 0000000..494f98f --- /dev/null +++ b/cpu/mcf547x_8x/slicetimer.c @@ -0,0 +1,112 @@ +/* + * (C) Copyright 2007 Freescale Semiconductor, Inc. + * TsiChung Liew (Tsi-Chung.Liew@freescale.com) + * + * 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 + +#include +#include + +DECLARE_GLOBAL_DATA_PTR; + +static ulong timestamp; + +#if defined(CONFIG_SLTTMR) +#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 slt_t *timerp = (slt_t *) (CFG_UDELAY_BASE); + u32 now, freq; + + /* 1 us period */ + freq = CFG_TIMER_PRESCALER; + + timerp->cr = 0; /* Disable */ + timerp->tcnt = usec * freq; + timerp->cr = SLT_CR_TEN; + + now = timerp->cnt; + while (now != 0) + now = timerp->cnt; + + timerp->sr |= SLT_SR_ST; + timerp->cr = 0; +} + +void dtimer_interrupt(void *not_used) +{ + volatile slt_t *timerp = (slt_t *) (CFG_TMR_BASE); + + /* check for timer interrupt asserted */ + if ((CFG_TMRPND_REG & CFG_TMRINTR_MASK) == CFG_TMRINTR_PEND) { + timerp->sr |= SLT_SR_ST; + timestamp++; + return; + } +} + +void timer_init(void) +{ + volatile slt_t *timerp = (slt_t *) (CFG_TMR_BASE); + + timestamp = 0; + + timerp->cr = 0; /* disable timer */ + timerp->tcnt = 0; + timerp->sr = SLT_SR_BE | SLT_SR_ST; /* clear status */ + + /* initialize and enable timer interrupt */ + irq_install_handler(CFG_TMRINTR_NO, dtimer_interrupt, 0); + + /* Interrupt every ms */ + timerp->tcnt = 1000 * CFG_TIMER_PRESCALER; + + dtimer_intr_setup(); + + /* set a period of 1us, set timer mode to restart and + enable timer and interrupt */ + timerp->cr = SLT_CR_RUN | SLT_CR_IEN | SLT_CR_TEN; +} + +void reset_timer(void) +{ + timestamp = 0; +} + +ulong get_timer(ulong base) +{ + return (timestamp - base); +} + +void set_timer(ulong t) +{ + timestamp = t; +} +#endif /* CONFIG_SLTTMR */ -- cgit v1.1