1/*
2 * arch/sh/kernel/cpu/sh3/clock-sh3.c
3 *
4 * Generic SH-3 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 stc_multipliers[] = { 1, 2, 3, 4, 6, 1, 1, 1 };
26static int ifc_divisors[]    = { 1, 2, 3, 4, 1, 1, 1, 1 };
27static int pfc_divisors[]    = { 1, 2, 3, 4, 6, 1, 1, 1 };
28
29static void master_clk_init(struct clk *clk)
30{
31	int frqcr = __raw_readw(FRQCR);
32	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
33
34	clk->rate *= pfc_divisors[idx];
35}
36
37static struct sh_clk_ops sh3_master_clk_ops = {
38	.init		= master_clk_init,
39};
40
41static unsigned long module_clk_recalc(struct clk *clk)
42{
43	int frqcr = __raw_readw(FRQCR);
44	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
45
46	return clk->parent->rate / pfc_divisors[idx];
47}
48
49static struct sh_clk_ops sh3_module_clk_ops = {
50	.recalc		= module_clk_recalc,
51};
52
53static unsigned long bus_clk_recalc(struct clk *clk)
54{
55	int frqcr = __raw_readw(FRQCR);
56	int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
57
58	return clk->parent->rate / stc_multipliers[idx];
59}
60
61static struct sh_clk_ops sh3_bus_clk_ops = {
62	.recalc		= bus_clk_recalc,
63};
64
65static unsigned long cpu_clk_recalc(struct clk *clk)
66{
67	int frqcr = __raw_readw(FRQCR);
68	int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
69
70	return clk->parent->rate / ifc_divisors[idx];
71}
72
73static struct sh_clk_ops sh3_cpu_clk_ops = {
74	.recalc		= cpu_clk_recalc,
75};
76
77static struct sh_clk_ops *sh3_clk_ops[] = {
78	&sh3_master_clk_ops,
79	&sh3_module_clk_ops,
80	&sh3_bus_clk_ops,
81	&sh3_cpu_clk_ops,
82};
83
84void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
85{
86	if (idx < ARRAY_SIZE(sh3_clk_ops))
87		*ops = sh3_clk_ops[idx];
88}
89
90