1// SPDX-License-Identifier: GPL-2.0
2/*
3 * arch/sh/kernel/cpu/sh3/clock-sh7709.c
4 *
5 * SH7709 support for the clock framework
6 *
7 *  Copyright (C) 2005  Andriy Skulysh
8 *
9 * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c
10 *  Copyright (C) 2005  Paul Mundt
11 */
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <asm/clock.h>
15#include <asm/freq.h>
16#include <asm/io.h>
17
18static int stc_multipliers[] = { 1, 2, 4, 8, 3, 6, 1, 1 };
19static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
20static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };
21
22static void master_clk_init(struct clk *clk)
23{
24	int frqcr = __raw_readw(FRQCR);
25	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
26
27	clk->rate *= pfc_divisors[idx];
28}
29
30static struct sh_clk_ops sh7709_master_clk_ops = {
31	.init		= master_clk_init,
32};
33
34static unsigned long module_clk_recalc(struct clk *clk)
35{
36	int frqcr = __raw_readw(FRQCR);
37	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
38
39	return clk->parent->rate / pfc_divisors[idx];
40}
41
42static struct sh_clk_ops sh7709_module_clk_ops = {
43	.recalc		= module_clk_recalc,
44};
45
46static unsigned long bus_clk_recalc(struct clk *clk)
47{
48	int frqcr = __raw_readw(FRQCR);
49	int idx = (frqcr & 0x0080) ?
50		((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1;
51
52	return clk->parent->rate * stc_multipliers[idx];
53}
54
55static struct sh_clk_ops sh7709_bus_clk_ops = {
56	.recalc		= bus_clk_recalc,
57};
58
59static unsigned long cpu_clk_recalc(struct clk *clk)
60{
61	int frqcr = __raw_readw(FRQCR);
62	int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
63
64	return clk->parent->rate / ifc_divisors[idx];
65}
66
67static struct sh_clk_ops sh7709_cpu_clk_ops = {
68	.recalc		= cpu_clk_recalc,
69};
70
71static struct sh_clk_ops *sh7709_clk_ops[] = {
72	&sh7709_master_clk_ops,
73	&sh7709_module_clk_ops,
74	&sh7709_bus_clk_ops,
75	&sh7709_cpu_clk_ops,
76};
77
78void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
79{
80	if (idx < ARRAY_SIZE(sh7709_clk_ops))
81		*ops = sh7709_clk_ops[idx];
82}
83