aboutsummaryrefslogtreecommitdiff
path: root/drivers/cpufreq/s3c24xx-cpufreq-debugfs.c
blob: 93971dfe7c7519e723d33339f68264b85496c1fc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2009 Simtec Electronics
 *	http://armlinux.simtec.co.uk/
 *	Ben Dooks <ben@simtec.co.uk>
 *
 * S3C24XX CPU Frequency scaling - debugfs status support
*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/cpufreq.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/err.h>

#include <linux/soc/samsung/s3c-cpufreq-core.h>

static struct dentry *dbgfs_root;
static struct dentry *dbgfs_file_io;
static struct dentry *dbgfs_file_info;
static struct dentry *dbgfs_file_board;

#define print_ns(x) ((x) / 10), ((x) % 10)

static void show_max(struct seq_file *seq, struct s3c_freq *f)
{
	seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n",
		   f->fclk, f->hclk, f->pclk, f->armclk);
}

static int board_show(struct seq_file *seq, void *p)
{
	struct s3c_cpufreq_config *cfg;
	struct s3c_cpufreq_board *brd;

	cfg = s3c_cpufreq_getconfig();
	if (!cfg) {
		seq_printf(seq, "no configuration registered\n");
		return 0;
	}

	brd = cfg->board;
	if (!brd) {
		seq_printf(seq, "no board definition set?\n");
		return 0;
	}

	seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh);
	seq_printf(seq, "auto_io=%u\n", brd->auto_io);
	seq_printf(seq, "need_io=%u\n", brd->need_io);

	show_max(seq, &brd->max);


	return 0;
}

DEFINE_SHOW_ATTRIBUTE(board);

static int info_show(struct seq_file *seq, void *p)
{
	struct s3c_cpufreq_config *cfg;

	cfg = s3c_cpufreq_getconfig();
	if (!cfg) {
		seq_printf(seq, "no configuration registered\n");
		return 0;
	}

	seq_printf(seq, "  FCLK %ld Hz\n", cfg->freq.fclk);
	seq_printf(seq, "  HCLK %ld Hz (%lu.%lu ns)\n",
		   cfg->freq.hclk, print_ns(cfg->freq.hclk_tns));
	seq_printf(seq, "  PCLK %ld Hz\n", cfg->freq.hclk);
	seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk);
	seq_printf(seq, "\n");

	show_max(seq, &cfg->max);

	seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n",
		   cfg->divs.h_divisor, cfg->divs.p_divisor,
		   cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off");
	seq_printf(seq, "\n");

	seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(info);

static int io_show(struct seq_file *seq, void *p)
{
	void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *);
	struct s3c_cpufreq_config *cfg;
	struct s3c_iotimings *iot;
	union s3c_iobank *iob;
	int bank;

	cfg = s3c_cpufreq_getconfig();
	if (!cfg) {
		seq_printf(seq, "no configuration registered\n");
		return 0;
	}

	show_bank = cfg->info->debug_io_show;
	if (!show_bank) {
		seq_printf(seq, "no code to show bank timing\n");
		return 0;
	}

	iot = s3c_cpufreq_getiotimings();
	if (!iot) {
		seq_printf(seq, "no io timings registered\n");
		return 0;
	}

	seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns));

	for (bank = 0; bank < MAX_BANKS; bank++) {
		iob = &iot->bank[bank];

		seq_printf(seq, "bank %d: ", bank);

		if (!iob->io_2410) {
			seq_printf(seq, "nothing set\n");
			continue;
		}

		show_bank(seq, cfg, iob);
	}

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(io);

static int __init s3c_freq_debugfs_init(void)
{
	dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL);
	if (IS_ERR(dbgfs_root)) {
		pr_err("%s: error creating debugfs root\n", __func__);
		return PTR_ERR(dbgfs_root);
	}

	dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,
					    NULL, &io_fops);

	dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root,
					      NULL, &info_fops);

	dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root,
					       NULL, &board_fops);

	return 0;
}

late_initcall(s3c_freq_debugfs_init);