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