clock.c
2.37 KB
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
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
/*
* Copyright (C) 2015 Atmel Corporation
* Wenyou Yang <wenyou.yang@atmel.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <asm/arch/at91_pmc.h>
#define EN_UPLL_TIMEOUT 500
void at91_periph_clk_enable(int id)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
#ifdef CPU_HAS_PCR
u32 regval;
u32 div_value;
if (id > AT91_PMC_PCR_PID_MASK)
return;
writel(id, &pmc->pcr);
div_value = readl(&pmc->pcr) & AT91_PMC_PCR_DIV;
regval = AT91_PMC_PCR_EN | AT91_PMC_PCR_CMD_WRITE | id | div_value;
writel(regval, &pmc->pcr);
#else
writel(0x01 << id, &pmc->pcer);
#endif
}
void at91_periph_clk_disable(int id)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
#ifdef CPU_HAS_PCR
u32 regval;
if (id > AT91_PMC_PCR_PID_MASK)
return;
regval = AT91_PMC_PCR_CMD_WRITE | id;
writel(regval, &pmc->pcr);
#else
writel(0x01 << id, &pmc->pcdr);
#endif
}
void at91_system_clk_enable(int sys_clk)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
writel(sys_clk, &pmc->scer);
}
void at91_system_clk_disable(int sys_clk)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
writel(sys_clk, &pmc->scdr);
}
int at91_upll_clk_enable(void)
{
struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
ulong start_time, tmp_time;
if ((readl(&pmc->uckr) & AT91_PMC_UPLLEN) == AT91_PMC_UPLLEN)
return 0;
start_time = get_timer(0);
writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr);
while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) {
tmp_time = get_timer(0);
if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
printf("ERROR: failed to enable UPLL\n");
return -1;
}
}
return 0;
}
int at91_upll_clk_disable(void)
{
struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
ulong start_time, tmp_time;
start_time = get_timer(0);
writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr);
while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) {
tmp_time = get_timer(0);
if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
printf("ERROR: failed to stop UPLL\n");
return -1;
}
}
return 0;
}
void at91_usb_clk_init(u32 value)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
writel(value, &pmc->usb);
}
void at91_pllicpr_init(u32 icpr)
{
struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
writel(icpr, &pmc->pllicpr);
}