1/*
2 * arch/sh/kernel/cpu/sh4a/clock-sh73180.c
3 *
4 * SH73180 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
25/*
26 * SH73180 uses a common set of divisors, so this is quite simple..
27 */
28static int divisors[] = { 1, 2, 3, 4, 6, 8, 12, 16 };
29
30static void master_clk_init(struct clk *clk)
31{
32	clk->rate *= divisors[ctrl_inl(FRQCR) & 0x0007];
33}
34
35static struct clk_ops sh73180_master_clk_ops = {
36	.init		= master_clk_init,
37};
38
39static void module_clk_recalc(struct clk *clk)
40{
41	int idx = (ctrl_inl(FRQCR) & 0x0007);
42	clk->rate = clk->parent->rate / divisors[idx];
43}
44
45static struct clk_ops sh73180_module_clk_ops = {
46	.recalc		= module_clk_recalc,
47};
48
49static void bus_clk_recalc(struct clk *clk)
50{
51	int idx = (ctrl_inl(FRQCR) >> 12) & 0x0007;
52	clk->rate = clk->parent->rate / divisors[idx];
53}
54
55static struct clk_ops sh73180_bus_clk_ops = {
56	.recalc		= bus_clk_recalc,
57};
58
59static void cpu_clk_recalc(struct clk *clk)
60{
61	int idx = (ctrl_inl(FRQCR) >> 20) & 0x0007;
62	clk->rate = clk->parent->rate / divisors[idx];
63}
64
65static struct clk_ops sh73180_cpu_clk_ops = {
66	.recalc		= cpu_clk_recalc,
67};
68
69static struct clk_ops *sh73180_clk_ops[] = {
70	&sh73180_master_clk_ops,
71	&sh73180_module_clk_ops,
72	&sh73180_bus_clk_ops,
73	&sh73180_cpu_clk_ops,
74};
75
76void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
77{
78	if (idx < ARRAY_SIZE(sh73180_clk_ops))
79		*ops = sh73180_clk_ops[idx];
80}
81