1 /*
2 * (C) Copyright 2002
3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
4 * Marius Groeger <mgroeger@sysgo.de>
5 *
6 * (C) Copyright 2002
7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8 * Alex Zuepke <azu@sysgo.de>
9 *
10 * (C) Copyright 2002
11 * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de>
12 *
13 * See file CREDITS for list of people who contributed to this
14 * project.
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation; either version 2 of
19 * the License, or (at your option) any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 * MA 02111-1307 USA
30 */
31
32 #include <common.h>
33 #if defined (CONFIG_IMX)
34
35 #include <asm/arch/imx-regs.h>
36
timer_init(void)37 int timer_init (void)
38 {
39 int i;
40 /* setup GP Timer 1 */
41 TCTL1 = TCTL_SWR;
42 for ( i=0; i<100; i++) TCTL1 = 0; /* We have no udelay by now */
43 TPRER1 = get_PERCLK1() / 1000000; /* 1 MHz */
44 TCTL1 |= TCTL_FRR | (1<<1); /* Freerun Mode, PERCLK1 input */
45
46 reset_timer_masked();
47
48 return (0);
49 }
50
51 /*
52 * timer without interrupts
53 */
54
reset_timer(void)55 void reset_timer (void)
56 {
57 reset_timer_masked ();
58 }
59
get_timer(ulong base)60 ulong get_timer (ulong base)
61 {
62 return get_timer_masked() - base;
63 }
64
set_timer(ulong t)65 void set_timer (ulong t)
66 {
67 /* nop */
68 }
69
reset_timer_masked(void)70 void reset_timer_masked (void)
71 {
72 TCTL1 &= ~TCTL_TEN;
73 TCTL1 |= TCTL_TEN; /* Enable timer */
74 }
75
get_timer_masked(void)76 ulong get_timer_masked (void)
77 {
78 return TCN1;
79 }
80
udelay_masked(unsigned long usec)81 void udelay_masked (unsigned long usec)
82 {
83 ulong endtime = get_timer_masked() + usec;
84 signed long diff;
85
86 do {
87 ulong now = get_timer_masked ();
88 diff = endtime - now;
89 } while (diff >= 0);
90 }
91
__udelay(unsigned long usec)92 void __udelay (unsigned long usec)
93 {
94 udelay_masked(usec);
95 }
96
97 /*
98 * This function is derived from PowerPC code (read timebase as long long).
99 * On ARM it just returns the timer value.
100 */
get_ticks(void)101 unsigned long long get_ticks(void)
102 {
103 return get_timer(0);
104 }
105
106 /*
107 * This function is derived from PowerPC code (timebase clock frequency).
108 * On ARM it returns the number of timer ticks per second.
109 */
get_tbclk(void)110 ulong get_tbclk (void)
111 {
112 ulong tbclk;
113
114 tbclk = CONFIG_SYS_HZ;
115
116 return tbclk;
117 }
118
119 /*
120 * Reset the cpu by setting up the watchdog timer and let him time out
121 */
reset_cpu(ulong ignored)122 void reset_cpu (ulong ignored)
123 {
124 /* Disable watchdog and set Time-Out field to 0 */
125 WCR = 0x00000000;
126
127 /* Write Service Sequence */
128 WSR = 0x00005555;
129 WSR = 0x0000AAAA;
130
131 /* Enable watchdog */
132 WCR = 0x00000001;
133
134 while (1);
135 /*NOTREACHED*/
136 }
137
138 #endif /* defined (CONFIG_IMX) */
139