1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * arch/sh/kernel/cpu/sh3/clock-sh7710.c
4  *
5  * SH7710 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 
22 static int md_table[] = { 1, 2, 3, 4, 6, 8, 12 };
23 
master_clk_init(struct clk * clk)24 static void master_clk_init(struct clk *clk)
25 {
26 	clk->rate *= md_table[__raw_readw(FRQCR) & 0x0007];
27 }
28 
29 static struct sh_clk_ops sh7710_master_clk_ops = {
30 	.init		= master_clk_init,
31 };
32 
module_clk_recalc(struct clk * clk)33 static unsigned long module_clk_recalc(struct clk *clk)
34 {
35 	int idx = (__raw_readw(FRQCR) & 0x0007);
36 	return clk->parent->rate / md_table[idx];
37 }
38 
39 static struct sh_clk_ops sh7710_module_clk_ops = {
40 	.recalc		= module_clk_recalc,
41 };
42 
bus_clk_recalc(struct clk * clk)43 static unsigned long bus_clk_recalc(struct clk *clk)
44 {
45 	int idx = (__raw_readw(FRQCR) & 0x0700) >> 8;
46 	return clk->parent->rate / md_table[idx];
47 }
48 
49 static struct sh_clk_ops sh7710_bus_clk_ops = {
50 	.recalc		= bus_clk_recalc,
51 };
52 
cpu_clk_recalc(struct clk * clk)53 static unsigned long cpu_clk_recalc(struct clk *clk)
54 {
55 	int idx = (__raw_readw(FRQCR) & 0x0070) >> 4;
56 	return clk->parent->rate / md_table[idx];
57 }
58 
59 static struct sh_clk_ops sh7710_cpu_clk_ops = {
60 	.recalc		= cpu_clk_recalc,
61 };
62 
63 static struct sh_clk_ops *sh7710_clk_ops[] = {
64 	&sh7710_master_clk_ops,
65 	&sh7710_module_clk_ops,
66 	&sh7710_bus_clk_ops,
67 	&sh7710_cpu_clk_ops,
68 };
69 
arch_init_clk_ops(struct sh_clk_ops ** ops,int idx)70 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
71 {
72 	if (idx < ARRAY_SIZE(sh7710_clk_ops))
73 		*ops = sh7710_clk_ops[idx];
74 }
75 
76