Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Open Menu /arch/sh/kernel/cpu/sh3/clock-sh7706.c
Loading...
 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
/*
 * arch/sh/kernel/cpu/sh3/clock-sh7706.c
 *
 * SH7706 support for the clock framework
 *
 *  Copyright (C) 2006  Takashi YOSHII
 *
 * Based on arch/sh/kernel/cpu/sh3/clock-sh7709.c
 *  Copyright (C) 2005  Andriy Skulysh
 *
 * 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 <asm/clock.h>
#include <asm/freq.h>
#include <asm/io.h>

static int stc_multipliers[] = { 1, 2, 4, 1, 3, 6, 1, 1 };
static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };

static void master_clk_init(struct clk *clk)
{
	int frqcr = __raw_readw(FRQCR);
	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);

	clk->rate *= pfc_divisors[idx];
}

static struct sh_clk_ops sh7706_master_clk_ops = {
	.init		= master_clk_init,
};

static unsigned long module_clk_recalc(struct clk *clk)
{
	int frqcr = __raw_readw(FRQCR);
	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);

	return clk->parent->rate / pfc_divisors[idx];
}

static struct sh_clk_ops sh7706_module_clk_ops = {
	.recalc		= module_clk_recalc,
};

static unsigned long bus_clk_recalc(struct clk *clk)
{
	int frqcr = __raw_readw(FRQCR);
	int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);

	return clk->parent->rate / stc_multipliers[idx];
}

static struct sh_clk_ops sh7706_bus_clk_ops = {
	.recalc		= bus_clk_recalc,
};

static unsigned long cpu_clk_recalc(struct clk *clk)
{
	int frqcr = __raw_readw(FRQCR);
	int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);

	return clk->parent->rate / ifc_divisors[idx];
}

static struct sh_clk_ops sh7706_cpu_clk_ops = {
	.recalc		= cpu_clk_recalc,
};

static struct sh_clk_ops *sh7706_clk_ops[] = {
	&sh7706_master_clk_ops,
	&sh7706_module_clk_ops,
	&sh7706_bus_clk_ops,
	&sh7706_cpu_clk_ops,
};

void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
{
	if (idx < ARRAY_SIZE(sh7706_clk_ops))
		*ops = sh7706_clk_ops[idx];
}