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
|
/*
* arch/sh/kernel/cpu/sh2a/clock-sh7264.c
*
* SH7264 clock framework support
*
* Copyright (C) 2012 Phil Edworthy
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/clkdev.h>
#include <asm/clock.h>
/* SH7264 registers */
#define FRQCR 0xfffe0010
#define STBCR3 0xfffe0408
#define STBCR4 0xfffe040c
#define STBCR5 0xfffe0410
#define STBCR6 0xfffe0414
#define STBCR7 0xfffe0418
#define STBCR8 0xfffe041c
static const unsigned int pll1rate[] = {8, 12};
static unsigned int pll1_div;
/* Fixed 32 KHz root clock for RTC */
static struct clk r_clk = {
.rate = 32768,
};
/*
* Default rate for the root input clock, reset this with clk_set_rate()
* from the platform code.
*/
static struct clk extal_clk = {
.rate = 18000000,
};
static unsigned long pll_recalc(struct clk *clk)
{
unsigned long rate = clk->parent->rate / pll1_div;
return rate * pll1rate[(__raw_readw(FRQCR) >> 8) & 1];
}
static struct sh_clk_ops pll_clk_ops = {
.recalc = pll_recalc,
};
static struct clk pll_clk = {
.ops = &pll_clk_ops,
.parent = &extal_clk,
.flags = CLK_ENABLE_ON_INIT,
};
struct clk *main_clks[] = {
&r_clk,
&extal_clk,
&pll_clk,
};
static int div2[] = { 1, 2, 3, 4, 6, 8, 12 };
static struct clk_div_mult_table div4_div_mult_table = {
.divisors = div2,
.nr_divisors = ARRAY_SIZE(div2),
};
static struct clk_div4_table div4_table = {
.div_mult_table = &div4_div_mult_table,
};
enum { DIV4_I, DIV4_P,
DIV4_NR };
#define DIV4(_reg, _bit, _mask, _flags) \
SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
/* The mask field specifies the div2 entries that are valid */
struct clk div4_clks[DIV4_NR] = {
[DIV4_I] = DIV4(FRQCR, 4, 0x7, CLK_ENABLE_REG_16BIT
| CLK_ENABLE_ON_INIT),
[DIV4_P] = DIV4(FRQCR, 0, 0x78, CLK_ENABLE_REG_16BIT),
};
enum { MSTP77, MSTP74, MSTP72,
MSTP60,
MSTP35, MSTP34, MSTP33, MSTP32, MSTP30,
MSTP_NR };
static struct clk mstp_clks[MSTP_NR] = {
[MSTP77] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR7, 7, 0), /* SCIF */
[MSTP74] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR7, 4, 0), /* VDC */
[MSTP72] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR7, 2, 0), /* CMT */
[MSTP60] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR6, 0, 0), /* USB */
[MSTP35] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR3, 6, 0), /* MTU2 */
[MSTP34] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR3, 4, 0), /* SDHI0 */
[MSTP33] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR3, 3, 0), /* SDHI1 */
[MSTP32] = SH_CLK_MSTP8(&div4_clks[DIV4_P], STBCR3, 2, 0), /* ADC */
[MSTP30] = SH_CLK_MSTP8(&r_clk, STBCR3, 0, 0), /* RTC */
};
static struct clk_lookup lookups[] = {
/* main clocks */
CLKDEV_CON_ID("rclk", &r_clk),
CLKDEV_CON_ID("extal", &extal_clk),
CLKDEV_CON_ID("pll_clk", &pll_clk),
/* DIV4 clocks */
CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
/* MSTP clocks */
CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP77]),
CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP77]),
CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP77]),
CLKDEV_ICK_ID("fck", "sh-sci.3", &mstp_clks[MSTP77]),
CLKDEV_ICK_ID("fck", "sh-sci.4", &mstp_clks[MSTP77]),
CLKDEV_ICK_ID("fck", "sh-sci.5", &mstp_clks[MSTP77]),
CLKDEV_ICK_ID("fck", "sh-sci.6", &mstp_clks[MSTP77]),
CLKDEV_ICK_ID("fck", "sh-sci.7", &mstp_clks[MSTP77]),
CLKDEV_CON_ID("vdc3", &mstp_clks[MSTP74]),
CLKDEV_ICK_ID("fck", "sh-cmt-16.0", &mstp_clks[MSTP72]),
CLKDEV_CON_ID("usb0", &mstp_clks[MSTP60]),
CLKDEV_ICK_ID("fck", "sh-mtu2", &mstp_clks[MSTP35]),
CLKDEV_CON_ID("sdhi0", &mstp_clks[MSTP34]),
CLKDEV_CON_ID("sdhi1", &mstp_clks[MSTP33]),
CLKDEV_CON_ID("adc0", &mstp_clks[MSTP32]),
CLKDEV_CON_ID("rtc0", &mstp_clks[MSTP30]),
};
int __init arch_clk_init(void)
{
int k, ret = 0;
if (test_mode_pin(MODE_PIN0)) {
if (test_mode_pin(MODE_PIN1))
pll1_div = 3;
else
pll1_div = 4;
} else
pll1_div = 1;
for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
ret = clk_register(main_clks[k]);
clkdev_add_table(lookups, ARRAY_SIZE(lookups));
if (!ret)
ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
if (!ret)
ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
return ret;
}
|
