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 
master_clk_init(struct clk * clk)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 
module_clk_recalc(struct clk * clk)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 
bus_clk_recalc(struct clk * clk)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 
cpu_clk_recalc(struct clk * clk)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 
arch_init_clk_ops(struct sh_clk_ops ** ops,int idx)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