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09ec1d7e | 1 | /* |
e6d197a6 BD |
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> | |
a69e4c28 | 14 | #include <linux/export.h> |
e6d197a6 BD |
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 |