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.
13 #include <asm/global_data.h>
14 #include <linux/delay.h>
16 #include <asm/timer.h>
17 #include <asm/immap.h>
20 DECLARE_GLOBAL_DATA_PTR;
22 static volatile ulong timestamp = 0;
24 #ifndef CONFIG_SYS_WATCHDOG_FREQ
25 #define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
28 #if defined(CONFIG_MCFTMR)
29 #ifndef CONFIG_SYS_UDELAY_BASE
30 # error "uDelay base not defined!"
33 #if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK)
34 # error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!"
36 extern void dtimer_intr_setup(void);
38 void __udelay(unsigned long usec)
40 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_UDELAY_BASE);
50 /* Set up TIMER 3 as timebase clock */
51 timerp->tmr = DTIM_DTMR_RST_RST;
53 /* set period to 1 us */
55 CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | DTIM_DTMR_FRR |
58 start = now = timerp->tcn;
59 while (now < start + tmp)
64 void dtimer_interrupt(void *not_used)
66 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
68 /* check for timer interrupt asserted */
69 if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
70 timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF);
73 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
74 if (CONFIG_SYS_WATCHDOG_FREQ && (timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) {
77 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
84 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
91 /* Set up TIMER 4 as clock */
92 timerp->tmr = DTIM_DTMR_RST_RST;
94 /* initialize and enable timer interrupt */
95 irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
98 timerp->trr = 1000; /* Interrupt every ms */
102 /* set a period of 1us, set timer mode to restart and enable timer and interrupt */
103 timerp->tmr = CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 |
104 DTIM_DTMR_FRR | DTIM_DTMR_ORRI | DTIM_DTMR_RST_EN;
109 ulong get_timer(ulong base)
111 return (timestamp - base);
114 #endif /* CONFIG_MCFTMR */
117 * This function is derived from PowerPC code (read timebase as long long).
118 * On M68K it just returns the timer value.
120 unsigned long long get_ticks(void)
125 unsigned long usec2ticks(unsigned long usec)
127 return get_timer(usec);
131 * This function is derived from PowerPC code (timebase clock frequency).
132 * On M68K it returns the number of timer ticks per second.
134 ulong get_tbclk(void)
136 return CONFIG_SYS_HZ;