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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/init.h>
16 #include <linux/export.h>
17 #include <linux/interrupt.h>
18 #include <linux/ioport.h>
19 #include <linux/cpufreq.h>
20 #include <linux/debugfs.h>
21 #include <linux/seq_file.h>
22 #include <linux/err.h>
23
24 #include <plat/cpu-freq-core.h>
25
26 static struct dentry *dbgfs_root;
27 static struct dentry *dbgfs_file_io;
28 static struct dentry *dbgfs_file_info;
29 static struct dentry *dbgfs_file_board;
30
31 #define print_ns(x) ((x) / 10), ((x) % 10)
32
show_max(struct seq_file * seq,struct s3c_freq * f)33 static void show_max(struct seq_file *seq, struct s3c_freq *f)
34 {
35 seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n",
36 f->fclk, f->hclk, f->pclk, f->armclk);
37 }
38
board_show(struct seq_file * seq,void * p)39 static int board_show(struct seq_file *seq, void *p)
40 {
41 struct s3c_cpufreq_config *cfg;
42 struct s3c_cpufreq_board *brd;
43
44 cfg = s3c_cpufreq_getconfig();
45 if (!cfg) {
46 seq_printf(seq, "no configuration registered\n");
47 return 0;
48 }
49
50 brd = cfg->board;
51 if (!brd) {
52 seq_printf(seq, "no board definition set?\n");
53 return 0;
54 }
55
56 seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh);
57 seq_printf(seq, "auto_io=%u\n", brd->auto_io);
58 seq_printf(seq, "need_io=%u\n", brd->need_io);
59
60 show_max(seq, &brd->max);
61
62
63 return 0;
64 }
65
fops_board_open(struct inode * inode,struct file * file)66 static int fops_board_open(struct inode *inode, struct file *file)
67 {
68 return single_open(file, board_show, NULL);
69 }
70
71 static const struct file_operations fops_board = {
72 .open = fops_board_open,
73 .read = seq_read,
74 .llseek = seq_lseek,
75 .release = single_release,
76 .owner = THIS_MODULE,
77 };
78
info_show(struct seq_file * seq,void * p)79 static int info_show(struct seq_file *seq, void *p)
80 {
81 struct s3c_cpufreq_config *cfg;
82
83 cfg = s3c_cpufreq_getconfig();
84 if (!cfg) {
85 seq_printf(seq, "no configuration registered\n");
86 return 0;
87 }
88
89 seq_printf(seq, " FCLK %ld Hz\n", cfg->freq.fclk);
90 seq_printf(seq, " HCLK %ld Hz (%lu.%lu ns)\n",
91 cfg->freq.hclk, print_ns(cfg->freq.hclk_tns));
92 seq_printf(seq, " PCLK %ld Hz\n", cfg->freq.hclk);
93 seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk);
94 seq_printf(seq, "\n");
95
96 show_max(seq, &cfg->max);
97
98 seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n",
99 cfg->divs.h_divisor, cfg->divs.p_divisor,
100 cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off");
101 seq_printf(seq, "\n");
102
103 seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll);
104
105 return 0;
106 }
107
fops_info_open(struct inode * inode,struct file * file)108 static int fops_info_open(struct inode *inode, struct file *file)
109 {
110 return single_open(file, info_show, NULL);
111 }
112
113 static const struct file_operations fops_info = {
114 .open = fops_info_open,
115 .read = seq_read,
116 .llseek = seq_lseek,
117 .release = single_release,
118 .owner = THIS_MODULE,
119 };
120
io_show(struct seq_file * seq,void * p)121 static int io_show(struct seq_file *seq, void *p)
122 {
123 void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *);
124 struct s3c_cpufreq_config *cfg;
125 struct s3c_iotimings *iot;
126 union s3c_iobank *iob;
127 int bank;
128
129 cfg = s3c_cpufreq_getconfig();
130 if (!cfg) {
131 seq_printf(seq, "no configuration registered\n");
132 return 0;
133 }
134
135 show_bank = cfg->info->debug_io_show;
136 if (!show_bank) {
137 seq_printf(seq, "no code to show bank timing\n");
138 return 0;
139 }
140
141 iot = s3c_cpufreq_getiotimings();
142 if (!iot) {
143 seq_printf(seq, "no io timings registered\n");
144 return 0;
145 }
146
147 seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns));
148
149 for (bank = 0; bank < MAX_BANKS; bank++) {
150 iob = &iot->bank[bank];
151
152 seq_printf(seq, "bank %d: ", bank);
153
154 if (!iob->io_2410) {
155 seq_printf(seq, "nothing set\n");
156 continue;
157 }
158
159 show_bank(seq, cfg, iob);
160 }
161
162 return 0;
163 }
164
fops_io_open(struct inode * inode,struct file * file)165 static int fops_io_open(struct inode *inode, struct file *file)
166 {
167 return single_open(file, io_show, NULL);
168 }
169
170 static const struct file_operations fops_io = {
171 .open = fops_io_open,
172 .read = seq_read,
173 .llseek = seq_lseek,
174 .release = single_release,
175 .owner = THIS_MODULE,
176 };
177
178
s3c_freq_debugfs_init(void)179 static int __init s3c_freq_debugfs_init(void)
180 {
181 dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL);
182 if (IS_ERR(dbgfs_root)) {
183 pr_err("%s: error creating debugfs root\n", __func__);
184 return PTR_ERR(dbgfs_root);
185 }
186
187 dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root,
188 NULL, &fops_io);
189
190 dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root,
191 NULL, &fops_info);
192
193 dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root,
194 NULL, &fops_board);
195
196 return 0;
197 }
198
199 late_initcall(s3c_freq_debugfs_init);
200
201