1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * arch/sh/kernel/cpu/sh3/clock-sh3.c
 4 *
 5 * Generic SH-3 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 stc_multipliers[] = { 1, 2, 3, 4, 6, 1, 1, 1 };
23static int ifc_divisors[]    = { 1, 2, 3, 4, 1, 1, 1, 1 };
24static int pfc_divisors[]    = { 1, 2, 3, 4, 6, 1, 1, 1 };
25
26static void master_clk_init(struct clk *clk)
27{
28	int frqcr = __raw_readw(FRQCR);
29	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
30
31	clk->rate *= pfc_divisors[idx];
32}
33
34static struct sh_clk_ops sh3_master_clk_ops = {
35	.init		= master_clk_init,
36};
37
38static unsigned long module_clk_recalc(struct clk *clk)
39{
40	int frqcr = __raw_readw(FRQCR);
41	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
42
43	return clk->parent->rate / pfc_divisors[idx];
44}
45
46static struct sh_clk_ops sh3_module_clk_ops = {
47	.recalc		= module_clk_recalc,
48};
49
50static unsigned long bus_clk_recalc(struct clk *clk)
51{
52	int frqcr = __raw_readw(FRQCR);
53	int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
54
55	return clk->parent->rate / stc_multipliers[idx];
56}
57
58static struct sh_clk_ops sh3_bus_clk_ops = {
59	.recalc		= bus_clk_recalc,
60};
61
62static unsigned long cpu_clk_recalc(struct clk *clk)
63{
64	int frqcr = __raw_readw(FRQCR);
65	int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
66
67	return clk->parent->rate / ifc_divisors[idx];
68}
69
70static struct sh_clk_ops sh3_cpu_clk_ops = {
71	.recalc		= cpu_clk_recalc,
72};
73
74static struct sh_clk_ops *sh3_clk_ops[] = {
75	&sh3_master_clk_ops,
76	&sh3_module_clk_ops,
77	&sh3_bus_clk_ops,
78	&sh3_cpu_clk_ops,
79};
80
81void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
82{
83	if (idx < ARRAY_SIZE(sh3_clk_ops))
84		*ops = sh3_clk_ops[idx];
85}
86

 
 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