1/*
2 * Copyright (c) 2009 Simtec Electronics
3 *	http://armlinux.simtec.co.uk/
4 *	Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C24XX CPU Frequency scaling - debugfs status support
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11*/
12
13#include <linux/init.h>
14#include <linux/export.h>
15#include <linux/interrupt.h>
16#include <linux/ioport.h>
17#include <linux/cpufreq.h>
18#include <linux/debugfs.h>
19#include <linux/seq_file.h>
20#include <linux/err.h>
21
22#include <plat/cpu-freq-core.h>
23
24static struct dentry *dbgfs_root;
25static struct dentry *dbgfs_file_io;
26static struct dentry *dbgfs_file_info;
27static struct dentry *dbgfs_file_board;
28
29#define print_ns(x) ((x) / 10), ((x) % 10)
30
31static void show_max(struct seq_file *seq, struct s3c_freq *f)
32{
33	seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n",
34		   f->fclk, f->hclk, f->pclk, f->armclk);
35}
36
37static int board_show(struct seq_file *seq, void *p)
38{
39	struct s3c_cpufreq_config *cfg;
40	struct s3c_cpufreq_board *brd;
41
42	cfg = s3c_cpufreq_getconfig();
43	if (!cfg) {
44		seq_printf(seq, "no configuration registered\n");
45		return 0;
46	}
47
48	brd = cfg->board;
49	if (!brd) {
50		seq_printf(seq, "no board definition set?\n");
51		return 0;
52	}
53
54	seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh);
55	seq_printf(seq, "auto_io=%u\n", brd->auto_io);
56	seq_printf(seq, "need_io=%u\n", brd->need_io);
57
58	show_max(seq, &brd->max);
59
60
61	return 0;
62}
63
64static int fops_board_open(struct inode *inode, struct file *file)
65{
66	return single_open(file, board_show, NULL);
67}
68
69static const struct file_operations fops_board = {
70	.open		= fops_board_open,
71	.read		= seq_read,
72	.llseek		= seq_lseek,
73	.release	= single_release,
74	.owner		= THIS_MODULE,
75};
76
77static int info_show(struct seq_file *seq, void *p)
78{
79	struct s3c_cpufreq_config *cfg;
80
81	cfg = s3c_cpufreq_getconfig();
82	if (!cfg) {
83		seq_printf(seq, "no configuration registered\n");
84		return 0;
85	}
86
87	seq_printf(seq, "  FCLK %ld Hz\n", cfg->freq.fclk);
88	seq_printf(seq, "  HCLK %ld Hz (%lu.%lu ns)\n",
89		   cfg->freq.hclk, print_ns(cfg->freq.hclk_tns));
90	seq_printf(seq, "  PCLK %ld Hz\n", cfg->freq.hclk);
91	seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk);
92	seq_printf(seq, "\n");
93
94	show_max(seq, &cfg->max);
95
96	seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n",
97		   cfg->divs.h_divisor, cfg->divs.p_divisor,
98		   cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off");
99	seq_printf(seq, "\n");
100
101	seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll);
102
103	return 0;
104}
105
106static int fops_info_open(struct inode *inode, struct file *file)
107{
108	return single_open(file, info_show, NULL);
109}
110
111static const struct file_operations fops_info = {
112	.open		= fops_info_open,
113	.read		= seq_read,
114	.llseek		= seq_lseek,
115	.release	= single_release,
116	.owner		= THIS_MODULE,
117};
118
119static int io_show(struct seq_file *seq, void *p)
120{
121	void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *);
122	struct s3c_cpufreq_config *cfg;
123	struct s3c_iotimings *iot;
124	union s3c_iobank *iob;
125	int bank;
126
127	cfg = s3c_cpufreq_getconfig();
128	if (!cfg) {
129		seq_printf(seq, "no configuration registered\n");
130		return 0;
131	}
132
133	show_bank = cfg->info->debug_io_show;
134	if (!show_bank) {
135		seq_printf(seq, "no code to show bank timing\n");
136		return 0;
137	}
138
139	iot = s3c_cpufreq_getiotimings();
140	if (!iot) {
141		seq_printf(seq, "no io timings registered\n");
142		return 0;
143	}
144
145	seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns));
146
147	for (bank = 0; bank < MAX_BANKS; bank++) {
148		iob = &iot->bank[bank];
149
150		seq_printf(seq, "bank %d: ", bank);
151
152		if (!iob->io_2410) {
153			seq_printf(seq, "nothing set\n");
154			continue;
155		}
156
157		show_bank(seq, cfg, iob);
158	}
159
160	return 0;
161}
162
163static int fops_io_open(struct inode *inode, struct file *file)
164{
165	return single_open(file, io_show, NULL);
166}
167
168static const struct file_operations fops_io = {
169	.open		= fops_io_open,
170	.read		= seq_read,
171	.llseek		= seq_lseek,
172	.release	= single_release,
173	.owner		= THIS_MODULE,
174};
175
176
177static int __init s3c_freq_debugfs_init(void)
178{
179	dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL);
180	if (IS_ERR(dbgfs_root)) {
181		printk(KERN_ERR "%s: error creating debugfs root\n", __func__);
182		return PTR_ERR(dbgfs_root);
183	}
184
185	dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,
186					    NULL, &fops_io);
187
188	dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root,
189					      NULL, &fops_info);
190
191	dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root,
192					       NULL, &fops_board);
193
194	return 0;
195}
196
197late_initcall(s3c_freq_debugfs_init);
198
199