]> git.karo-electronics.de Git - karo-tx-linux.git/blob - drivers/cpufreq/s3c24xx-cpufreq-debugfs.c
Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
[karo-tx-linux.git] / drivers / cpufreq / s3c24xx-cpufreq-debugfs.c
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
24 static struct dentry *dbgfs_root;
25 static struct dentry *dbgfs_file_io;
26 static struct dentry *dbgfs_file_info;
27 static struct dentry *dbgfs_file_board;
28
29 #define print_ns(x) ((x) / 10), ((x) % 10)
30
31 static 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
37 static 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
64 static int fops_board_open(struct inode *inode, struct file *file)
65 {
66         return single_open(file, board_show, NULL);
67 }
68
69 static 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
77 static 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
106 static int fops_info_open(struct inode *inode, struct file *file)
107 {
108         return single_open(file, info_show, NULL);
109 }
110
111 static 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
119 static 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
163 static int fops_io_open(struct inode *inode, struct file *file)
164 {
165         return single_open(file, io_show, NULL);
166 }
167
168 static 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
177 static 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
197 late_initcall(s3c_freq_debugfs_init);
198