1/* linux/arch/arm/plat-s3c24xx/cpu-freq-debugfs.c
  2 *
  3 * Copyright (c) 2009 Simtec Electronics
  4 *	http://armlinux.simtec.co.uk/
  5 *	Ben Dooks <ben@simtec.co.uk>
  6 *
  7 * S3C24XX CPU Frequency scaling - debugfs status support
  8 *
  9 * This program is free software; you can redistribute it and/or modify
 10 * it under the terms of the GNU General Public License version 2 as
 11 * published by the Free Software Foundation.
 12*/
 13
 14#include <linux/init.h>
 15#include <linux/module.h>
 16#include <linux/interrupt.h>
 17#include <linux/ioport.h>
 18#include <linux/cpufreq.h>
 19#include <linux/debugfs.h>
 20#include <linux/seq_file.h>
 21#include <linux/err.h>
 22
 23#include <plat/cpu-freq-core.h>
 24
 25static struct dentry *dbgfs_root;
 26static struct dentry *dbgfs_file_io;
 27static struct dentry *dbgfs_file_info;
 28static struct dentry *dbgfs_file_board;
 29
 30#define print_ns(x) ((x) / 10), ((x) % 10)
 31
 32static void show_max(struct seq_file *seq, struct s3c_freq *f)
 33{
 34	seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n",
 35		   f->fclk, f->hclk, f->pclk, f->armclk);
 36}
 37
 38static int board_show(struct seq_file *seq, void *p)
 39{
 40	struct s3c_cpufreq_config *cfg;
 41	struct s3c_cpufreq_board *brd;
 42
 43	cfg = s3c_cpufreq_getconfig();
 44	if (!cfg) {
 45		seq_printf(seq, "no configuration registered\n");
 46		return 0;
 47	}
 48
 49	brd = cfg->board;
 50	if (!brd) {
 51		seq_printf(seq, "no board definition set?\n");
 52		return 0;
 53	}
 54
 55	seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh);
 56	seq_printf(seq, "auto_io=%u\n", brd->auto_io);
 57	seq_printf(seq, "need_io=%u\n", brd->need_io);
 58
 59	show_max(seq, &brd->max);
 60
 61
 62	return 0;
 63}
 64
 65static int fops_board_open(struct inode *inode, struct file *file)
 66{
 67	return single_open(file, board_show, NULL);
 68}
 69
 70static const struct file_operations fops_board = {
 71	.open		= fops_board_open,
 72	.read		= seq_read,
 73	.llseek		= seq_lseek,
 74	.release	= single_release,
 75	.owner		= THIS_MODULE,
 76};
 77
 78static int info_show(struct seq_file *seq, void *p)
 79{
 80	struct s3c_cpufreq_config *cfg;
 81
 82	cfg = s3c_cpufreq_getconfig();
 83	if (!cfg) {
 84		seq_printf(seq, "no configuration registered\n");
 85		return 0;
 86	}
 87
 88	seq_printf(seq, "  FCLK %ld Hz\n", cfg->freq.fclk);
 89	seq_printf(seq, "  HCLK %ld Hz (%lu.%lu ns)\n",
 90		   cfg->freq.hclk, print_ns(cfg->freq.hclk_tns));
 91	seq_printf(seq, "  PCLK %ld Hz\n", cfg->freq.hclk);
 92	seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk);
 93	seq_printf(seq, "\n");
 94
 95	show_max(seq, &cfg->max);
 96
 97	seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n",
 98		   cfg->divs.h_divisor, cfg->divs.p_divisor,
 99		   cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off");
100	seq_printf(seq, "\n");
101
102	seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll);
103
104	return 0;
105}
106
107static int fops_info_open(struct inode *inode, struct file *file)
108{
109	return single_open(file, info_show, NULL);
110}
111
112static const struct file_operations fops_info = {
113	.open		= fops_info_open,
114	.read		= seq_read,
115	.llseek		= seq_lseek,
116	.release	= single_release,
117	.owner		= THIS_MODULE,
118};
119
120static int io_show(struct seq_file *seq, void *p)
121{
122	void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *);
123	struct s3c_cpufreq_config *cfg;
124	struct s3c_iotimings *iot;
125	union s3c_iobank *iob;
126	int bank;
127
128	cfg = s3c_cpufreq_getconfig();
129	if (!cfg) {
130		seq_printf(seq, "no configuration registered\n");
131		return 0;
132	}
133
134	show_bank = cfg->info->debug_io_show;
135	if (!show_bank) {
136		seq_printf(seq, "no code to show bank timing\n");
137		return 0;
138	}
139
140	iot = s3c_cpufreq_getiotimings();
141	if (!iot) {
142		seq_printf(seq, "no io timings registered\n");
143		return 0;
144	}
145
146	seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns));
147
148	for (bank = 0; bank < MAX_BANKS; bank++) {
149		iob = &iot->bank[bank];
150
151		seq_printf(seq, "bank %d: ", bank);
152
153		if (!iob->io_2410) {
154			seq_printf(seq, "nothing set\n");
155			continue;
156		}
157
158		show_bank(seq, cfg, iob);
159	}
160
161	return 0;
162}
163
164static int fops_io_open(struct inode *inode, struct file *file)
165{
166	return single_open(file, io_show, NULL);
167}
168
169static const struct file_operations fops_io = {
170	.open		= fops_io_open,
171	.read		= seq_read,
172	.llseek		= seq_lseek,
173	.release	= single_release,
174	.owner		= THIS_MODULE,
175};
176
177
178static int __init s3c_freq_debugfs_init(void)
179{
180	dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL);
181	if (IS_ERR(dbgfs_root)) {
182		printk(KERN_ERR "%s: error creating debugfs root\n", __func__);
183		return PTR_ERR(dbgfs_root);
184	}
185
186	dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,
187					    NULL, &fops_io);
188
189	dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root,
190					      NULL, &fops_info);
191
192	dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root,
193					       NULL, &fops_board);
194
195	return 0;
196}
197
198late_initcall(s3c_freq_debugfs_init);
199