2 * (C) Copyright 2003 Josef Baumgartner <josef.baumgartner@telex.de>
5 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <asm/timer.h>
29 #include <asm/immap.h>
32 DECLARE_GLOBAL_DATA_PTR;
34 static volatile ulong timestamp = 0;
36 #ifndef CONFIG_SYS_WATCHDOG_FREQ
37 #define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
40 #if defined(CONFIG_MCFTMR)
41 #ifndef CONFIG_SYS_UDELAY_BASE
42 # error "uDelay base not defined!"
45 #if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK)
46 # error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!"
48 extern void dtimer_intr_setup(void);
50 void __udelay(unsigned long usec)
52 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_UDELAY_BASE);
62 /* Set up TIMER 3 as timebase clock */
63 timerp->tmr = DTIM_DTMR_RST_RST;
65 /* set period to 1 us */
67 CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | DTIM_DTMR_FRR |
70 start = now = timerp->tcn;
71 while (now < start + tmp)
76 void dtimer_interrupt(void *not_used)
78 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
80 /* check for timer interrupt asserted */
81 if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
82 timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF);
85 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
86 if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) {
89 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
96 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
103 /* Set up TIMER 4 as clock */
104 timerp->tmr = DTIM_DTMR_RST_RST;
106 /* initialize and enable timer interrupt */
107 irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
110 timerp->trr = 1000; /* Interrupt every ms */
114 /* set a period of 1us, set timer mode to restart and enable timer and interrupt */
115 timerp->tmr = CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 |
116 DTIM_DTMR_FRR | DTIM_DTMR_ORRI | DTIM_DTMR_RST_EN;
119 ulong get_timer(ulong base)
121 return (timestamp - base);
124 #endif /* CONFIG_MCFTMR */
126 #if defined(CONFIG_MCFPIT)
127 #if !defined(CONFIG_SYS_PIT_BASE)
128 # error "CONFIG_SYS_PIT_BASE not defined!"
131 static unsigned short lastinc;
133 void __udelay(unsigned long usec)
135 volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_UDELAY_BASE);
145 /* Set up TIMER 3 as timebase clock */
146 timerp->pcsr = PIT_PCSR_OVW;
148 /* set period to 1 us */
149 timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN;
152 while (timerp->pcntr > 0) ;
156 void timer_init(void)
158 volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE);
161 /* Set up TIMER 4 as poll clock */
162 timerp->pcsr = PIT_PCSR_OVW;
163 timerp->pmr = lastinc = 0;
164 timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN;
167 ulong get_timer(ulong base)
169 unsigned short now, diff;
170 volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE);
173 diff = -(now - lastinc);
177 return timestamp - base;
180 void wait_ticks(unsigned long ticks)
182 u32 start = get_timer(0);
183 while (get_timer(start) < ticks) ;
185 #endif /* CONFIG_MCFPIT */
188 * This function is derived from PowerPC code (read timebase as long long).
189 * On M68K it just returns the timer value.
191 unsigned long long get_ticks(void)
196 unsigned long usec2ticks(unsigned long usec)
198 return get_timer(usec);
202 * This function is derived from PowerPC code (timebase clock frequency).
203 * On M68K it returns the number of timer ticks per second.
205 ulong get_tbclk(void)
208 tbclk = CONFIG_SYS_HZ;