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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