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/arch/sh/kernel/cpu/sh2a/clock-sh7201.c

https://gitlab.com/teobaluta/opw
C | 85 lines | 58 code | 13 blank | 14 comment | 4 complexity | 5f20306d59ef081850316b8e45d61950 MD5 | raw file
 1/*
 2 * arch/sh/kernel/cpu/sh2a/clock-sh7201.c
 3 *
 4 * SH7201 support for the clock framework
 5 *
 6 *  Copyright (C) 2008 Peter Griffin  <pgriffin@mpc-data.co.uk>
 7 *
 8 * Based on clock-sh4.c
 9 *  Copyright (C) 2005  Paul Mundt
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License.  See the file "COPYING" in the main directory of this archive
13 * for more details.
14 */
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <asm/clock.h>
18#include <asm/freq.h>
19#include <asm/io.h>
20
21static const int pll1rate[]={1,2,3,4,6,8};
22static const int pfc_divisors[]={1,2,3,4,6,8,12};
23#define ifc_divisors pfc_divisors
24
25static unsigned int pll2_mult;
26
27static void master_clk_init(struct clk *clk)
28{
29	clk->rate = 10000000 * pll2_mult *
30	       pll1rate[(__raw_readw(FREQCR) >> 8) & 0x0007];
31}
32
33static struct sh_clk_ops sh7201_master_clk_ops = {
34	.init		= master_clk_init,
35};
36
37static unsigned long module_clk_recalc(struct clk *clk)
38{
39	int idx = (__raw_readw(FREQCR) & 0x0007);
40	return clk->parent->rate / pfc_divisors[idx];
41}
42
43static struct sh_clk_ops sh7201_module_clk_ops = {
44	.recalc		= module_clk_recalc,
45};
46
47static unsigned long bus_clk_recalc(struct clk *clk)
48{
49	int idx = (__raw_readw(FREQCR) & 0x0007);
50	return clk->parent->rate / pfc_divisors[idx];
51}
52
53static struct sh_clk_ops sh7201_bus_clk_ops = {
54	.recalc		= bus_clk_recalc,
55};
56
57static unsigned long cpu_clk_recalc(struct clk *clk)
58{
59	int idx = ((__raw_readw(FREQCR) >> 4) & 0x0007);
60	return clk->parent->rate / ifc_divisors[idx];
61}
62
63static struct sh_clk_ops sh7201_cpu_clk_ops = {
64	.recalc		= cpu_clk_recalc,
65};
66
67static struct sh_clk_ops *sh7201_clk_ops[] = {
68	&sh7201_master_clk_ops,
69	&sh7201_module_clk_ops,
70	&sh7201_bus_clk_ops,
71	&sh7201_cpu_clk_ops,
72};
73
74void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
75{
76	if (test_mode_pin(MODE_PIN1 | MODE_PIN0))
77		pll2_mult = 1;
78	else if (test_mode_pin(MODE_PIN1))
79		pll2_mult = 2;
80	else
81		pll2_mult = 4;
82
83	if (idx < ARRAY_SIZE(sh7201_clk_ops))
84		*ops = sh7201_clk_ops[idx];
85}