blob: 27ada2924c9577c4cb0a96fcf834a109d0e5f035 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
/*
* Copyright (C) 2012-2015 Masahiro Yamada <yamada.masahiro@socionext.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <linux/io.h>
#include <mach/arm-mpcore.h>
#define PERIPHCLK (50 * 1000 * 1000) /* 50 MHz */
#define PRESCALER ((PERIPHCLK) / (CONFIG_SYS_TIMER_RATE) - 1)
static void *get_global_timer_base(void)
{
void *val;
asm("mrc p15, 4, %0, c15, c0, 0" : "=r" (val) : : "memory");
return val + GLOBAL_TIMER_OFFSET;
}
unsigned long timer_read_counter(void)
{
/*
* ARM 64bit Global Timer is too much for our purpose.
* We use only lower 32 bit of the timer counter.
*/
return readl(get_global_timer_base() + GTIMER_CNT_L);
}
int timer_init(void)
{
/* enable timer */
writel(PRESCALER << 8 | 1, get_global_timer_base() + GTIMER_CTRL);
return 0;
}
|
