1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * arch/sh/kernel/cpu/sh3/clock-sh7709.c
4 *
5 * SH7709 support for the clock framework
6 *
7 * Copyright (C) 2005 Andriy Skulysh
8 *
9 * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.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 stc_multipliers[] = { 1, 2, 4, 8, 3, 6, 1, 1 };
19 static int ifc_divisors[] = { 1, 2, 4, 1, 3, 1, 1, 1 };
20 static int pfc_divisors[] = { 1, 2, 4, 1, 3, 6, 1, 1 };
21
22 static void master_clk_init(struct clk *clk)
23 {
24 int frqcr = __raw_readw(FRQCR);
25 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
26
27 clk->rate *= pfc_divisors[idx];
28 }
29
30 static struct sh_clk_ops sh7709_master_clk_ops = {
31 .init = master_clk_init,
32 };
33
34 static unsigned long module_clk_recalc(struct clk *clk)
35 {
36 int frqcr = __raw_readw(FRQCR);
37 int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
38
39 return clk->parent->rate / pfc_divisors[idx];
40 }
41
42 static struct sh_clk_ops sh7709_module_clk_ops = {
43 .recalc = module_clk_recalc,
44 };
45
46 static unsigned long bus_clk_recalc(struct clk *clk)
47 {
48 int frqcr = __raw_readw(FRQCR);
49 int idx = (frqcr & 0x0080) ?
50 ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1;
51
52 return clk->parent->rate * stc_multipliers[idx];
53 }
54
55 static struct sh_clk_ops sh7709_bus_clk_ops = {
56 .recalc = bus_clk_recalc,
57 };
58
59 static unsigned long cpu_clk_recalc(struct clk *clk)
60 {
61 int frqcr = __raw_readw(FRQCR);
62 int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
63
64 return clk->parent->rate / ifc_divisors[idx];
65 }
66
67 static struct sh_clk_ops sh7709_cpu_clk_ops = {
68 .recalc = cpu_clk_recalc,
69 };
70
71 static struct sh_clk_ops *sh7709_clk_ops[] = {
72 &sh7709_master_clk_ops,
73 &sh7709_module_clk_ops,
74 &sh7709_bus_clk_ops,
75 &sh7709_cpu_clk_ops,
76 };
77
78 void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
79 {
80 if (idx < ARRAY_SIZE(sh7709_clk_ops))
81 *ops = sh7709_clk_ops[idx];
82 }
83
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