xref: /openbmc/linux/arch/sh/kernel/cpu/sh3/clock-sh7712.c (revision 5ab5d57c)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * arch/sh/kernel/cpu/sh3/clock-sh7712.c
4  *
5  * SH7712 support for the clock framework
6  *
7  *  Copyright (C) 2007  Andrew Murray <amurray@mpc-data.co.uk>
8  *
9  * Based on arch/sh/kernel/cpu/sh3/clock-sh3.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 
18 static int multipliers[] = { 1, 2, 3 };
19 static int divisors[]    = { 1, 2, 3, 4, 6 };
20 
master_clk_init(struct clk * clk)21 static void master_clk_init(struct clk *clk)
22 {
23 	int frqcr = __raw_readw(FRQCR);
24 	int idx = (frqcr & 0x0300) >> 8;
25 
26 	clk->rate *= multipliers[idx];
27 }
28 
29 static struct sh_clk_ops sh7712_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 frqcr = __raw_readw(FRQCR);
36 	int idx = frqcr & 0x0007;
37 
38 	return clk->parent->rate / divisors[idx];
39 }
40 
41 static struct sh_clk_ops sh7712_module_clk_ops = {
42 	.recalc		= module_clk_recalc,
43 };
44 
cpu_clk_recalc(struct clk * clk)45 static unsigned long cpu_clk_recalc(struct clk *clk)
46 {
47 	int frqcr = __raw_readw(FRQCR);
48 	int idx = (frqcr & 0x0030) >> 4;
49 
50 	return clk->parent->rate / divisors[idx];
51 }
52 
53 static struct sh_clk_ops sh7712_cpu_clk_ops = {
54 	.recalc		= cpu_clk_recalc,
55 };
56 
57 static struct sh_clk_ops *sh7712_clk_ops[] = {
58 	&sh7712_master_clk_ops,
59 	&sh7712_module_clk_ops,
60 	&sh7712_cpu_clk_ops,
61 };
62 
arch_init_clk_ops(struct sh_clk_ops ** ops,int idx)63 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
64 {
65 	if (idx < ARRAY_SIZE(sh7712_clk_ops))
66 		*ops = sh7712_clk_ops[idx];
67 }
68 
69