1/*
2 * arch/sh/kernel/cpu/sh3/clock-sh7709.c
3 *
4 * SH7709 support for the clock framework
5 *
6 *  Copyright (C) 2005  Andriy Skulysh
7 *
8 * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c
9 *  Copyright (C) 2005  Paul Mundt
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License.  See the file "COPYING" in the main directory of this archive
13 * for more details.
14 */
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <asm/clock.h>
18#include <asm/freq.h>
19#include <asm/io.h>
20
21static int stc_multipliers[] = { 1, 2, 4, 8, 3, 6, 1, 1 };
22static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
23static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };
24
25static void set_bus_parent(struct clk *clk)
26{
27	struct clk *bus_clk = clk_get(NULL, "bus_clk");
28	clk->parent = bus_clk;
29	clk_put(bus_clk);
30}
31
32static void master_clk_init(struct clk *clk)
33{
34	int frqcr = ctrl_inw(FRQCR);
35	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
36
37	clk->rate *= pfc_divisors[idx];
38}
39
40static struct clk_ops sh7709_master_clk_ops = {
41	.init		= master_clk_init,
42};
43
44static void module_clk_recalc(struct clk *clk)
45{
46	int frqcr = ctrl_inw(FRQCR);
47	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
48
49	clk->rate = clk->parent->rate / pfc_divisors[idx];
50}
51
52static struct clk_ops sh7709_module_clk_ops = {
53#ifdef CLOCK_MODE_0_1_2_7
54	.init		= set_bus_parent,
55#endif
56	.recalc		= module_clk_recalc,
57};
58
59static void bus_clk_recalc(struct clk *clk)
60{
61	int frqcr = ctrl_inw(FRQCR);
62	int idx = (frqcr & 0x0080) ?
63		((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1;
64
65	clk->rate = clk->parent->rate * stc_multipliers[idx];
66}
67
68static struct clk_ops sh7709_bus_clk_ops = {
69	.recalc		= bus_clk_recalc,
70};
71
72static void cpu_clk_recalc(struct clk *clk)
73{
74	int frqcr = ctrl_inw(FRQCR);
75	int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
76
77	clk->rate = clk->parent->rate / ifc_divisors[idx];
78}
79
80static struct clk_ops sh7709_cpu_clk_ops = {
81	.init		= set_bus_parent,
82	.recalc		= cpu_clk_recalc,
83};
84
85static struct clk_ops *sh7709_clk_ops[] = {
86	&sh7709_master_clk_ops,
87	&sh7709_module_clk_ops,
88	&sh7709_bus_clk_ops,
89	&sh7709_cpu_clk_ops,
90};
91
92void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
93{
94	if (idx < ARRAY_SIZE(sh7709_clk_ops))
95		*ops = sh7709_clk_ops[idx];
96}
97