aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/plat-s5p/clock.c
blob: 8d081d968c58ddec76c40beef9a452e5511f68f7 (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
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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
/* linux/arch/arm/plat-s5p/clock.c
 *
 * Copyright 2009 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com/
 *
 * S5P - Common clock support
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/sysdev.h>
#include <linux/io.h>
#include <asm/div64.h>

#include <mach/regs-clock.h>

#include <plat/clock.h>
#include <plat/clock-clksrc.h>
#include <plat/s5p-clock.h>

/* fin_apll, fin_mpll and fin_epll are all the same clock, which we call
 * clk_ext_xtal_mux.
*/
struct clk clk_ext_xtal_mux = {
	.name		= "ext_xtal",
	.id		= -1,
};

struct clk clk_xusbxti = {
	.name		= "xusbxti",
	.id		= -1,
};

struct clk s5p_clk_27m = {
	.name		= "clk_27m",
	.id		= -1,
	.rate		= 27000000,
};

/* 48MHz USB Phy clock output */
struct clk clk_48m = {
	.name		= "clk_48m",
	.id		= -1,
	.rate		= 48000000,
};

/* APLL clock output
 * No need .ctrlbit, this is always on
*/
struct clk clk_fout_apll = {
	.name		= "fout_apll",
	.id		= -1,
};

/* MPLL clock output
 * No need .ctrlbit, this is always on
*/
struct clk clk_fout_mpll = {
	.name		= "fout_mpll",
	.id		= -1,
};

/* EPLL clock output */
struct clk clk_fout_epll = {
	.name		= "fout_epll",
	.id		= -1,
	.ctrlbit	= (1 << 31),
};

/* DPLL clock output */
struct clk clk_fout_dpll = {
	.name		= "fout_dpll",
	.id		= -1,
	.ctrlbit	= (1 << 31),
};

/* VPLL clock output */
struct clk clk_fout_vpll = {
	.name		= "fout_vpll",
	.id		= -1,
	.ctrlbit	= (1 << 31),
};

/* Possible clock sources for APLL Mux */
static struct clk *clk_src_apll_list[] = {
	[0] = &clk_fin_apll,
	[1] = &clk_fout_apll,
};

struct clksrc_sources clk_src_apll = {
	.sources	= clk_src_apll_list,
	.nr_sources	= ARRAY_SIZE(clk_src_apll_list),
};

/* Possible clock sources for MPLL Mux */
static struct clk *clk_src_mpll_list[] = {
	[0] = &clk_fin_mpll,
	[1] = &clk_fout_mpll,
};

struct clksrc_sources clk_src_mpll = {
	.sources	= clk_src_mpll_list,
	.nr_sources	= ARRAY_SIZE(clk_src_mpll_list),
};

/* Possible clock sources for EPLL Mux */
static struct clk *clk_src_epll_list[] = {
	[0] = &clk_fin_epll,
	[1] = &clk_fout_epll,
};

struct clksrc_sources clk_src_epll = {
	.sources	= clk_src_epll_list,
	.nr_sources	= ARRAY_SIZE(clk_src_epll_list),
};

/* Possible clock sources for DPLL Mux */
static struct clk *clk_src_dpll_list[] = {
	[0] = &clk_fin_dpll,
	[1] = &clk_fout_dpll,
};

struct clksrc_sources clk_src_dpll = {
	.sources	= clk_src_dpll_list,
	.nr_sources	= ARRAY_SIZE(clk_src_dpll_list),
};

struct clk clk_vpll = {
	.name		= "vpll",
	.id		= -1,
};

int s5p_gatectrl(void __iomem *reg, struct clk *clk, int enable)
{
	unsigned int ctrlbit = clk->ctrlbit;
	u32 con;

	con = __raw_readl(reg);
	con = enable ? (con | ctrlbit) : (con & ~ctrlbit);
	__raw_writel(con, reg);
	return 0;
}

int s5p_epll_enable(struct clk *clk, int enable)
{
	unsigned int ctrlbit = clk->ctrlbit;
	unsigned int epll_con = __raw_readl(S5P_EPLL_CON) & ~ctrlbit;

	if (enable)
		__raw_writel(epll_con | ctrlbit, S5P_EPLL_CON);
	else
		__raw_writel(epll_con, S5P_EPLL_CON);

	return 0;
}

unsigned long s5p_epll_get_rate(struct clk *clk)
{
	return clk->rate;
}

static struct clk *s5p_clks[] __initdata = {
	&clk_ext_xtal_mux,
	&clk_48m,
	&s5p_clk_27m,
	&clk_fout_apll,
	&clk_fout_mpll,
	&clk_fout_epll,
	&clk_fout_dpll,
	&clk_fout_vpll,
	&clk_vpll,
	&clk_xusbxti,
};

void __init s5p_register_clocks(unsigned long xtal_freq)
{
	int ret;

	clk_ext_xtal_mux.rate = xtal_freq;

	ret = s3c24xx_register_clocks(s5p_clks, ARRAY_SIZE(s5p_clks));
	if (ret > 0)
		printk(KERN_ERR "Failed to register s5p clocks\n");
}