1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2002
4  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
5  * Marius Groeger <mgroeger@sysgo.de>
6  *
7  * (C) Copyright 2002
8  * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
9  * Alex Zuepke <azu@sysgo.de>
10  *
11  * (C) Copyright 2002
12  * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
13  */
14 
15 #include <common.h>
16 #include <cpu_func.h>
17 #include <time.h>
18 #if defined (CONFIG_IMX)
19 
20 #include <asm/arch/imx-regs.h>
21 #include <linux/delay.h>
22 
timer_init(void)23 int timer_init (void)
24 {
25 	int i;
26 	/* setup GP Timer 1 */
27 	TCTL1 = TCTL_SWR;
28 	for ( i=0; i<100; i++) TCTL1 = 0; /* We have no udelay by now */
29 	TPRER1 = get_PERCLK1() / 1000000; /* 1 MHz */
30 	TCTL1 |= TCTL_FRR | (1<<1); /* Freerun Mode, PERCLK1 input */
31 
32 	/* Reset the timer */
33 	TCTL1 &= ~TCTL_TEN;
34 	TCTL1 |= TCTL_TEN; /* Enable timer */
35 
36 	return (0);
37 }
38 
39 /*
40  * timer without interrupts
41  */
get_timer_masked(void)42 static ulong get_timer_masked (void)
43 {
44 	return TCN1;
45 }
46 
get_timer(ulong base)47 ulong get_timer (ulong base)
48 {
49 	return get_timer_masked() - base;
50 }
51 
__udelay(unsigned long usec)52 void __udelay(unsigned long usec)
53 {
54 	ulong endtime = get_timer_masked() + usec;
55 	signed long diff;
56 
57 	do {
58 		ulong now = get_timer_masked ();
59 		diff = endtime - now;
60 	} while (diff >= 0);
61 }
62 
63 /*
64  * This function is derived from PowerPC code (read timebase as long long).
65  * On ARM it just returns the timer value.
66  */
get_ticks(void)67 unsigned long long get_ticks(void)
68 {
69 	return get_timer(0);
70 }
71 
72 /*
73  * This function is derived from PowerPC code (timebase clock frequency).
74  * On ARM it returns the number of timer ticks per second.
75  */
get_tbclk(void)76 ulong get_tbclk(void)
77 {
78 	return CONFIG_SYS_HZ;
79 }
80 
81 /*
82  * Reset the cpu by setting up the watchdog timer and let him time out
83  */
reset_cpu(void)84 void reset_cpu(void)
85 {
86 	/* Disable watchdog and set Time-Out field to 0 */
87 	WCR = 0x00000000;
88 
89 	/* Write Service Sequence */
90 	WSR = 0x00005555;
91 	WSR = 0x0000AAAA;
92 
93 	/* Enable watchdog */
94 	WCR = 0x00000001;
95 
96 	while (1);
97 	/*NOTREACHED*/
98 }
99 
100 #endif /* defined (CONFIG_IMX) */
101