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1 /*
2  * (C) Copyright 2012-2014
3  *     Texas Instruments Incorporated, <www.ti.com>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <asm/io.h>
10 #include <div64.h>
11
12 DECLARE_GLOBAL_DATA_PTR;
13
14 int timer_init(void)
15 {
16         gd->arch.tbl = 0;
17         gd->arch.tbu = 0;
18
19         gd->arch.timer_rate_hz = CONFIG_SYS_HZ_CLOCK / CONFIG_SYS_HZ;
20
21         return 0;
22 }
23
24 unsigned long long get_ticks(void)
25 {
26         ulong nowl, nowu;
27
28         asm volatile("mrrc p15, 0, %0, %1, c14" : "=r" (nowl), "=r" (nowu));
29
30         gd->arch.tbl = nowl;
31         gd->arch.tbu = nowu;
32
33         return (((unsigned long long)gd->arch.tbu) << 32) | gd->arch.tbl;
34 }
35
36
37 ulong get_timer(ulong base)
38 {
39         return lldiv(get_ticks(), gd->arch.timer_rate_hz) - base;
40 }
41
42 void __udelay(unsigned long usec)
43 {
44         unsigned long long endtime;
45
46         endtime = lldiv((unsigned long long)usec * gd->arch.timer_rate_hz,
47                         1000UL);
48
49         endtime += get_ticks();
50
51         while (get_ticks() < endtime)
52                 ;
53 }
54
55 ulong get_tbclk(void)
56 {
57         return gd->arch.timer_rate_hz;
58 }