1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2003 Josef Baumgartner <josef.baumgartner@telex.de>
6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
11 #include <asm/timer.h>
12 #include <asm/immap.h>
15 DECLARE_GLOBAL_DATA_PTR;
17 static volatile ulong timestamp = 0;
19 #ifndef CONFIG_SYS_WATCHDOG_FREQ
20 #define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
23 #if defined(CONFIG_MCFTMR)
24 #ifndef CONFIG_SYS_UDELAY_BASE
25 # error "uDelay base not defined!"
28 #if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK)
29 # error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!"
31 extern void dtimer_intr_setup(void);
33 void __udelay(unsigned long usec)
35 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_UDELAY_BASE);
45 /* Set up TIMER 3 as timebase clock */
46 timerp->tmr = DTIM_DTMR_RST_RST;
48 /* set period to 1 us */
50 CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | DTIM_DTMR_FRR |
53 start = now = timerp->tcn;
54 while (now < start + tmp)
59 void dtimer_interrupt(void *not_used)
61 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
63 /* check for timer interrupt asserted */
64 if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
65 timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF);
68 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
69 if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) {
72 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
79 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
86 /* Set up TIMER 4 as clock */
87 timerp->tmr = DTIM_DTMR_RST_RST;
89 /* initialize and enable timer interrupt */
90 irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
93 timerp->trr = 1000; /* Interrupt every ms */
97 /* set a period of 1us, set timer mode to restart and enable timer and interrupt */
98 timerp->tmr = CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 |
99 DTIM_DTMR_FRR | DTIM_DTMR_ORRI | DTIM_DTMR_RST_EN;
104 ulong get_timer(ulong base)
106 return (timestamp - base);
109 #endif /* CONFIG_MCFTMR */
111 #if defined(CONFIG_MCFPIT)
112 #if !defined(CONFIG_SYS_PIT_BASE)
113 # error "CONFIG_SYS_PIT_BASE not defined!"
116 static unsigned short lastinc;
118 void __udelay(unsigned long usec)
120 volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_UDELAY_BASE);
130 /* Set up TIMER 3 as timebase clock */
131 timerp->pcsr = PIT_PCSR_OVW;
133 /* set period to 1 us */
134 timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN;
137 while (timerp->pcntr > 0) ;
141 void timer_init(void)
143 volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE);
146 /* Set up TIMER 4 as poll clock */
147 timerp->pcsr = PIT_PCSR_OVW;
148 timerp->pmr = lastinc = 0;
149 timerp->pcsr |= PIT_PCSR_PRE(CONFIG_SYS_PIT_PRESCALE) | PIT_PCSR_EN;
154 ulong get_timer(ulong base)
156 unsigned short now, diff;
157 volatile pit_t *timerp = (pit_t *) (CONFIG_SYS_PIT_BASE);
160 diff = -(now - lastinc);
164 return timestamp - base;
167 void wait_ticks(unsigned long ticks)
169 u32 start = get_timer(0);
170 while (get_timer(start) < ticks) ;
172 #endif /* CONFIG_MCFPIT */
175 * This function is derived from PowerPC code (read timebase as long long).
176 * On M68K it just returns the timer value.
178 unsigned long long get_ticks(void)
183 unsigned long usec2ticks(unsigned long usec)
185 return get_timer(usec);
189 * This function is derived from PowerPC code (timebase clock frequency).
190 * On M68K it returns the number of timer ticks per second.
192 ulong get_tbclk(void)
194 return CONFIG_SYS_HZ;