1/*
 2 * arch/sh/kernel/cpu/sh4/clock-sh4.c
 3 *
 4 * Generic SH-4 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 ifc_divisors[] = { 1, 2, 3, 4, 6, 8, 1, 1 };
26#define bfc_divisors ifc_divisors	/* Same */
27static int pfc_divisors[] = { 2, 3, 4, 6, 8, 2, 2, 2 };
28
29static void master_clk_init(struct clk *clk)
30{
31	clk->rate *= pfc_divisors[__raw_readw(FRQCR) & 0x0007];
32}
33
34static struct sh_clk_ops sh4_master_clk_ops = {
35	.init		= master_clk_init,
36};
37
38static unsigned long module_clk_recalc(struct clk *clk)
39{
40	int idx = (__raw_readw(FRQCR) & 0x0007);
41	return clk->parent->rate / pfc_divisors[idx];
42}
43
44static struct sh_clk_ops sh4_module_clk_ops = {
45	.recalc		= module_clk_recalc,
46};
47
48static unsigned long bus_clk_recalc(struct clk *clk)
49{
50	int idx = (__raw_readw(FRQCR) >> 3) & 0x0007;
51	return clk->parent->rate / bfc_divisors[idx];
52}
53
54static struct sh_clk_ops sh4_bus_clk_ops = {
55	.recalc		= bus_clk_recalc,
56};
57
58static unsigned long cpu_clk_recalc(struct clk *clk)
59{
60	int idx = (__raw_readw(FRQCR) >> 6) & 0x0007;
61	return clk->parent->rate / ifc_divisors[idx];
62}
63
64static struct sh_clk_ops sh4_cpu_clk_ops = {
65	.recalc		= cpu_clk_recalc,
66};
67
68static struct sh_clk_ops *sh4_clk_ops[] = {
69	&sh4_master_clk_ops,
70	&sh4_module_clk_ops,
71	&sh4_bus_clk_ops,
72	&sh4_cpu_clk_ops,
73};
74
75void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
76{
77	if (idx < ARRAY_SIZE(sh4_clk_ops))
78		*ops = sh4_clk_ops[idx];
79}
80

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * arch/sh/kernel/cpu/sh4/clock-sh4.c
 4 *
 5 * Generic SH-4 support for the clock framework
 6 *
 7 *  Copyright (C) 2005  Paul Mundt
 8 *
 9 * FRQCR parsing hacked out of arch/sh/kernel/time.c
10 *
11 *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
12 *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
13 *  Copyright (C) 2002, 2003, 2004  Paul Mundt
14 *  Copyright (C) 2002  M. R. Brown  <mrbrown@linux-sh.org>
 
 
 
 
15 */
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <asm/clock.h>
19#include <asm/freq.h>
20#include <asm/io.h>
21
22static int ifc_divisors[] = { 1, 2, 3, 4, 6, 8, 1, 1 };
23#define bfc_divisors ifc_divisors	/* Same */
24static int pfc_divisors[] = { 2, 3, 4, 6, 8, 2, 2, 2 };
25
26static void master_clk_init(struct clk *clk)
27{
28	clk->rate *= pfc_divisors[__raw_readw(FRQCR) & 0x0007];
29}
30
31static struct sh_clk_ops sh4_master_clk_ops = {
32	.init		= master_clk_init,
33};
34
35static unsigned long module_clk_recalc(struct clk *clk)
36{
37	int idx = (__raw_readw(FRQCR) & 0x0007);
38	return clk->parent->rate / pfc_divisors[idx];
39}
40
41static struct sh_clk_ops sh4_module_clk_ops = {
42	.recalc		= module_clk_recalc,
43};
44
45static unsigned long bus_clk_recalc(struct clk *clk)
46{
47	int idx = (__raw_readw(FRQCR) >> 3) & 0x0007;
48	return clk->parent->rate / bfc_divisors[idx];
49}
50
51static struct sh_clk_ops sh4_bus_clk_ops = {
52	.recalc		= bus_clk_recalc,
53};
54
55static unsigned long cpu_clk_recalc(struct clk *clk)
56{
57	int idx = (__raw_readw(FRQCR) >> 6) & 0x0007;
58	return clk->parent->rate / ifc_divisors[idx];
59}
60
61static struct sh_clk_ops sh4_cpu_clk_ops = {
62	.recalc		= cpu_clk_recalc,
63};
64
65static struct sh_clk_ops *sh4_clk_ops[] = {
66	&sh4_master_clk_ops,
67	&sh4_module_clk_ops,
68	&sh4_bus_clk_ops,
69	&sh4_cpu_clk_ops,
70};
71
72void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
73{
74	if (idx < ARRAY_SIZE(sh4_clk_ops))
75		*ops = sh4_clk_ops[idx];
76}
77