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