1// SPDX-License-Identifier: GPL-2.0
2/*
3 * arch/sh/kernel/cpu/sh2a/clock-sh7201.c
4 *
5 * SH7201 support for the clock framework
6 *
7 * Copyright (C) 2008 Peter Griffin <pgriffin@mpc-data.co.uk>
8 *
9 * Based on clock-sh4.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
18static const int pll1rate[]={1,2,3,4,6,8};
19static const int pfc_divisors[]={1,2,3,4,6,8,12};
20#define ifc_divisors pfc_divisors
21
22static unsigned int pll2_mult;
23
24static void master_clk_init(struct clk *clk)
25{
26 clk->rate = 10000000 * pll2_mult *
27 pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0007];
28}
29
30static struct sh_clk_ops sh7201_master_clk_ops = {
31 .init = master_clk_init,
32};
33
34static unsigned long module_clk_recalc(struct clk *clk)
35{
36 int idx = (__raw_readw(FREQCR) & 0x0007);
37 return clk->parent->rate / pfc_divisors[idx];
38}
39
40static struct sh_clk_ops sh7201_module_clk_ops = {
41 .recalc = module_clk_recalc,
42};
43
44static unsigned long bus_clk_recalc(struct clk *clk)
45{
46 int idx = (__raw_readw(FREQCR) & 0x0007);
47 return clk->parent->rate / pfc_divisors[idx];
48}
49
50static struct sh_clk_ops sh7201_bus_clk_ops = {
51 .recalc = bus_clk_recalc,
52};
53
54static unsigned long cpu_clk_recalc(struct clk *clk)
55{
56 int idx = ((__raw_readw(FREQCR) >> 4) & 0x0007);
57 return clk->parent->rate / ifc_divisors[idx];
58}
59
60static struct sh_clk_ops sh7201_cpu_clk_ops = {
61 .recalc = cpu_clk_recalc,
62};
63
64static struct sh_clk_ops *sh7201_clk_ops[] = {
65 &sh7201_master_clk_ops,
66 &sh7201_module_clk_ops,
67 &sh7201_bus_clk_ops,
68 &sh7201_cpu_clk_ops,
69};
70
71void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
72{
73 if (test_mode_pin(MODE_PIN1 | MODE_PIN0))
74 pll2_mult = 1;
75 else if (test_mode_pin(MODE_PIN1))
76 pll2_mult = 2;
77 else
78 pll2_mult = 4;
79
80 if (idx < ARRAY_SIZE(sh7201_clk_ops))
81 *ops = sh7201_clk_ops[idx];
82}
83

source code of linux/arch/sh/kernel/cpu/sh2a/clock-sh7201.c