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author | Jon Loeliger <jdl@freescale.com> | 2008-01-03 09:46:55 -0600 |
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committer | Jon Loeliger <jdl@freescale.com> | 2008-01-03 09:46:55 -0600 |
commit | 2c3536425d987bf079258973e2acebaaef3e16b6 (patch) | |
tree | 659d06dd33eca4888e1f6d01d046507b76dc2d27 /cpu/sh4/time.c | |
parent | f743931f9b4d4e15c9bdfe726bef033ea1f1402c (diff) | |
parent | ce37422d0002e10490e268392e0c4e3028e52cec (diff) | |
download | u-boot-imx-2c3536425d987bf079258973e2acebaaef3e16b6.zip u-boot-imx-2c3536425d987bf079258973e2acebaaef3e16b6.tar.gz u-boot-imx-2c3536425d987bf079258973e2acebaaef3e16b6.tar.bz2 |
Merge commit 'wd/master'
Diffstat (limited to 'cpu/sh4/time.c')
-rw-r--r-- | cpu/sh4/time.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/cpu/sh4/time.c b/cpu/sh4/time.c new file mode 100644 index 0000000..5f8a3a0 --- /dev/null +++ b/cpu/sh4/time.c @@ -0,0 +1,98 @@ +/* + * (C) Copyright 2007 + * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org> + * + * (C) Copyright 2003 + * 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/processor.h> + +#define TMU_MAX_COUNTER (~0UL) + +static void tmu_timer_start (unsigned int timer) +{ + if (timer > 2) + return; + + *((volatile unsigned char *) TSTR) |= (1 << timer); +} + +static void tmu_timer_stop (unsigned int timer) +{ + u8 val = *((volatile u8 *)TSTR); + if (timer > 2) + return; + *((volatile unsigned char *)TSTR) = val &~(1 << timer); +} + +int timer_init (void) +{ + /* Divide clock by 4 */ + *(volatile u16 *)TCR0 = 0; + + tmu_timer_stop(0); + tmu_timer_start(0); + return 0; +} + +/* + In theory we should return a true 64bit value (ie something that doesn't + overflow). However, we don't. Therefore if TMU runs at fastest rate of + 6.75 MHz this value will wrap after u-boot has been running for approx + 10 minutes. +*/ +unsigned long long get_ticks (void) +{ + return (0 - *((volatile u32 *) TCNT0)); +} + +unsigned long get_timer (unsigned long base) +{ + return ((0 - *((volatile u32 *) TCNT0)) - base); +} + +void set_timer (unsigned long t) +{ + *((volatile unsigned int *) TCNT0) = (0 - t); +} + +void reset_timer (void) +{ + tmu_timer_stop(0); + set_timer (0); + tmu_timer_start(0); +} + +void udelay (unsigned long usec) +{ + unsigned int start = get_timer (0); + unsigned int end = start + (usec * ((CFG_HZ + 500000) / 1000000)); + + while (get_timer (0) < end) + continue; +} + +unsigned long get_tbclk (void) +{ + return CFG_HZ; +} |