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.
14 #include <asm/timer.h>
15 #include <asm/immap.h>
18 DECLARE_GLOBAL_DATA_PTR;
20 static volatile ulong timestamp = 0;
22 #ifndef CONFIG_SYS_WATCHDOG_FREQ
23 #define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2)
26 #if defined(CONFIG_MCFTMR)
27 #ifndef CONFIG_SYS_UDELAY_BASE
28 # error "uDelay base not defined!"
31 #if !defined(CONFIG_SYS_TMR_BASE) || !defined(CONFIG_SYS_INTR_BASE) || !defined(CONFIG_SYS_TMRINTR_NO) || !defined(CONFIG_SYS_TMRINTR_MASK)
32 # error "TMR_BASE, INTR_BASE, TMRINTR_NO or TMRINTR_MASk not defined!"
34 extern void dtimer_intr_setup(void);
36 void __udelay(unsigned long usec)
38 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_UDELAY_BASE);
48 /* Set up TIMER 3 as timebase clock */
49 timerp->tmr = DTIM_DTMR_RST_RST;
51 /* set period to 1 us */
53 CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 | DTIM_DTMR_FRR |
56 start = now = timerp->tcn;
57 while (now < start + tmp)
62 void dtimer_interrupt(void *not_used)
64 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
66 /* check for timer interrupt asserted */
67 if ((CONFIG_SYS_TMRPND_REG & CONFIG_SYS_TMRINTR_MASK) == CONFIG_SYS_TMRINTR_PEND) {
68 timerp->ter = (DTIM_DTER_CAP | DTIM_DTER_REF);
71 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
72 if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) {
75 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
82 volatile dtmr_t *timerp = (dtmr_t *) (CONFIG_SYS_TMR_BASE);
89 /* Set up TIMER 4 as clock */
90 timerp->tmr = DTIM_DTMR_RST_RST;
92 /* initialize and enable timer interrupt */
93 irq_install_handler(CONFIG_SYS_TMRINTR_NO, dtimer_interrupt, 0);
96 timerp->trr = 1000; /* Interrupt every ms */
100 /* set a period of 1us, set timer mode to restart and enable timer and interrupt */
101 timerp->tmr = CONFIG_SYS_TIMER_PRESCALER | DTIM_DTMR_CLK_DIV1 |
102 DTIM_DTMR_FRR | DTIM_DTMR_ORRI | DTIM_DTMR_RST_EN;
107 ulong get_timer(ulong base)
109 return (timestamp - base);
112 #endif /* CONFIG_MCFTMR */
115 * This function is derived from PowerPC code (read timebase as long long).
116 * On M68K it just returns the timer value.
118 unsigned long long get_ticks(void)
123 unsigned long usec2ticks(unsigned long usec)
125 return get_timer(usec);
129 * This function is derived from PowerPC code (timebase clock frequency).
130 * On M68K it returns the number of timer ticks per second.
132 ulong get_tbclk(void)
134 return CONFIG_SYS_HZ;