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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> | |
a69e4c28 | 15 | #include <linux/export.h> |
e6d197a6 BD |
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 | ||
25 | static struct dentry *dbgfs_root; | |
26 | static struct dentry *dbgfs_file_io; | |
27 | static struct dentry *dbgfs_file_info; | |
28 | static struct dentry *dbgfs_file_board; | |
29 | ||
30 | #define print_ns(x) ((x) / 10), ((x) % 10) | |
31 | ||
32 | static 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 | ||
38 | static 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 | ||
65 | static int fops_board_open(struct inode *inode, struct file *file) | |
66 | { | |
67 | return single_open(file, board_show, NULL); | |
68 | } | |
69 | ||
70 | static 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 | ||
78 | static 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 | ||
107 | static int fops_info_open(struct inode *inode, struct file *file) | |
108 | { | |
109 | return single_open(file, info_show, NULL); | |
110 | } | |
111 | ||
112 | static 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 | ||
120 | static 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 | ||
164 | static int fops_io_open(struct inode *inode, struct file *file) | |
165 | { | |
166 | return single_open(file, io_show, NULL); | |
167 | } | |
168 | ||
169 | static 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 | ||
178 | static 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 | ||
198 | late_initcall(s3c_freq_debugfs_init); | |
199 |