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 
18 static const int pll1rate[]={1,2,3,4,6,8};
19 static const int pfc_divisors[]={1,2,3,4,6,8,12};
20 #define ifc_divisors pfc_divisors
21 
22 static unsigned int pll2_mult;
23 
24 static void master_clk_init(struct clk *clk)
25 {
26 	clk->rate *= pll2_mult * pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0007];
27 }
28 
29 static struct sh_clk_ops sh7206_master_clk_ops = {
30 	.init		= master_clk_init,
31 };
32 
33 static 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 
39 static struct sh_clk_ops sh7206_module_clk_ops = {
40 	.recalc		= module_clk_recalc,
41 };
42 
43 static unsigned long bus_clk_recalc(struct clk *clk)
44 {
45 	return clk->parent->rate / pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0007];
46 }
47 
48 static struct sh_clk_ops sh7206_bus_clk_ops = {
49 	.recalc		= bus_clk_recalc,
50 };
51 
52 static 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 
58 static struct sh_clk_ops sh7206_cpu_clk_ops = {
59 	.recalc		= cpu_clk_recalc,
60 };
61 
62 static 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 
69 void __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 }
81