1/*
2 * arch/sh/kernel/cpu/sh3/clock-sh7300.c
3 *
4 * SH7300 support for the clock framework
5 *
6 *  Copyright (C) 2005  Paul Mundt
7 *
8 * FRQCR parsing hacked out of arch/sh/kernel/time.c
9 *
10 *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
11 *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
12 *  Copyright (C) 2002, 2003, 2004  Paul Mundt
13 *  Copyright (C) 2002  M. R. Brown  <mrbrown@linux-sh.org>
14 *
15 * This file is subject to the terms and conditions of the GNU General Public
16 * License.  See the file "COPYING" in the main directory of this archive
17 * for more details.
18 */
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <asm/clock.h>
22#include <asm/freq.h>
23#include <asm/io.h>
24
25static int md_table[] = { 1, 2, 3, 4, 6, 8, 12 };
26
27static void master_clk_init(struct clk *clk)
28{
29	clk->rate *= md_table[ctrl_inw(FRQCR) & 0x0007];
30}
31
32static struct clk_ops sh7300_master_clk_ops = {
33	.init		= master_clk_init,
34};
35
36static void module_clk_recalc(struct clk *clk)
37{
38	int idx = (ctrl_inw(FRQCR) & 0x0007);
39	clk->rate = clk->parent->rate / md_table[idx];
40}
41
42static struct clk_ops sh7300_module_clk_ops = {
43	.recalc		= module_clk_recalc,
44};
45
46static void bus_clk_recalc(struct clk *clk)
47{
48	int idx = (ctrl_inw(FRQCR) & 0x0700) >> 8;
49	clk->rate = clk->parent->rate / md_table[idx];
50}
51
52static struct clk_ops sh7300_bus_clk_ops = {
53	.recalc		= bus_clk_recalc,
54};
55
56static void cpu_clk_recalc(struct clk *clk)
57{
58	int idx = (ctrl_inw(FRQCR) & 0x0070) >> 4;
59	clk->rate = clk->parent->rate / md_table[idx];
60}
61
62static struct clk_ops sh7300_cpu_clk_ops = {
63	.recalc		= cpu_clk_recalc,
64};
65
66static struct clk_ops *sh7300_clk_ops[] = {
67	&sh7300_master_clk_ops,
68	&sh7300_module_clk_ops,
69	&sh7300_bus_clk_ops,
70	&sh7300_cpu_clk_ops,
71};
72
73void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
74{
75	if (idx < ARRAY_SIZE(sh7300_clk_ops))
76		*ops = sh7300_clk_ops[idx];
77}
78