clock-sh7206.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * arch/sh/kernel/cpu/sh2a/clock-sh7206.c
 4 *
 5 * SH7206 support for the clock framework
 6 *
 7 *  Copyright (C) 2006  Yoshinori Sato
 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 *= pll2_mult * pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0007];
27}
28
29static struct sh_clk_ops sh7206_master_clk_ops = {
30	.init		= master_clk_init,
31};
32
33static unsigned long module_clk_recalc(struct clk *clk)
34{
35	int idx = (__raw_readw(FREQCR) & 0x0007);
36	return clk->parent->rate / pfc_divisors[idx];
37}
38
39static struct sh_clk_ops sh7206_module_clk_ops = {
40	.recalc		= module_clk_recalc,
41};
42
43static unsigned long bus_clk_recalc(struct clk *clk)
44{
45	return clk->parent->rate / pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0007];
46}
47
48static struct sh_clk_ops sh7206_bus_clk_ops = {
49	.recalc		= bus_clk_recalc,
50};
51
52static unsigned long cpu_clk_recalc(struct clk *clk)
53{
54	int idx = (__raw_readw(FREQCR) & 0x0007);
55	return clk->parent->rate / ifc_divisors[idx];
56}
57
58static struct sh_clk_ops sh7206_cpu_clk_ops = {
59	.recalc		= cpu_clk_recalc,
60};
61
62static struct sh_clk_ops *sh7206_clk_ops[] = {
63	&sh7206_master_clk_ops,
64	&sh7206_module_clk_ops,
65	&sh7206_bus_clk_ops,
66	&sh7206_cpu_clk_ops,
67};
68
69void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
70{
71	if (test_mode_pin(MODE_PIN2 | MODE_PIN1 | MODE_PIN0))
72		pll2_mult = 1;
73	else if (test_mode_pin(MODE_PIN2 | MODE_PIN1))
74		pll2_mult = 2;
75	else if (test_mode_pin(MODE_PIN1))
76		pll2_mult = 4;
77
78	if (idx < ARRAY_SIZE(sh7206_clk_ops))
79		*ops = sh7206_clk_ops[idx];
80}