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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
09ec1d7e | 2 | /* |
e6d197a6 BD |
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 | |
e6d197a6 BD |
8 | */ |
9 | ||
1c5864e2 JP |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
e6d197a6 | 12 | #include <linux/init.h> |
a69e4c28 | 13 | #include <linux/export.h> |
e6d197a6 BD |
14 | #include <linux/interrupt.h> |
15 | #include <linux/ioport.h> | |
16 | #include <linux/cpufreq.h> | |
17 | #include <linux/debugfs.h> | |
18 | #include <linux/seq_file.h> | |
19 | #include <linux/err.h> | |
20 | ||
21 | #include <plat/cpu-freq-core.h> | |
22 | ||
23 | static struct dentry *dbgfs_root; | |
24 | static struct dentry *dbgfs_file_io; | |
25 | static struct dentry *dbgfs_file_info; | |
26 | static struct dentry *dbgfs_file_board; | |
27 | ||
28 | #define print_ns(x) ((x) / 10), ((x) % 10) | |
29 | ||
30 | static void show_max(struct seq_file *seq, struct s3c_freq *f) | |
31 | { | |
32 | seq_printf(seq, "MAX: F=%lu, H=%lu, P=%lu, A=%lu\n", | |
33 | f->fclk, f->hclk, f->pclk, f->armclk); | |
34 | } | |
35 | ||
36 | static int board_show(struct seq_file *seq, void *p) | |
37 | { | |
38 | struct s3c_cpufreq_config *cfg; | |
39 | struct s3c_cpufreq_board *brd; | |
40 | ||
41 | cfg = s3c_cpufreq_getconfig(); | |
42 | if (!cfg) { | |
43 | seq_printf(seq, "no configuration registered\n"); | |
44 | return 0; | |
45 | } | |
46 | ||
47 | brd = cfg->board; | |
48 | if (!brd) { | |
49 | seq_printf(seq, "no board definition set?\n"); | |
50 | return 0; | |
51 | } | |
52 | ||
53 | seq_printf(seq, "SDRAM refresh %u ns\n", brd->refresh); | |
54 | seq_printf(seq, "auto_io=%u\n", brd->auto_io); | |
55 | seq_printf(seq, "need_io=%u\n", brd->need_io); | |
56 | ||
57 | show_max(seq, &brd->max); | |
58 | ||
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
6e218d21 | 63 | DEFINE_SHOW_ATTRIBUTE(board); |
e6d197a6 BD |
64 | |
65 | static int info_show(struct seq_file *seq, void *p) | |
66 | { | |
67 | struct s3c_cpufreq_config *cfg; | |
68 | ||
69 | cfg = s3c_cpufreq_getconfig(); | |
70 | if (!cfg) { | |
71 | seq_printf(seq, "no configuration registered\n"); | |
72 | return 0; | |
73 | } | |
74 | ||
75 | seq_printf(seq, " FCLK %ld Hz\n", cfg->freq.fclk); | |
76 | seq_printf(seq, " HCLK %ld Hz (%lu.%lu ns)\n", | |
77 | cfg->freq.hclk, print_ns(cfg->freq.hclk_tns)); | |
78 | seq_printf(seq, " PCLK %ld Hz\n", cfg->freq.hclk); | |
79 | seq_printf(seq, "ARMCLK %ld Hz\n", cfg->freq.armclk); | |
80 | seq_printf(seq, "\n"); | |
81 | ||
82 | show_max(seq, &cfg->max); | |
83 | ||
84 | seq_printf(seq, "Divisors: P=%d, H=%d, A=%d, dvs=%s\n", | |
85 | cfg->divs.h_divisor, cfg->divs.p_divisor, | |
86 | cfg->divs.arm_divisor, cfg->divs.dvs ? "on" : "off"); | |
87 | seq_printf(seq, "\n"); | |
88 | ||
89 | seq_printf(seq, "lock_pll=%u\n", cfg->lock_pll); | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
6e218d21 | 94 | DEFINE_SHOW_ATTRIBUTE(info); |
e6d197a6 BD |
95 | |
96 | static int io_show(struct seq_file *seq, void *p) | |
97 | { | |
98 | void (*show_bank)(struct seq_file *, struct s3c_cpufreq_config *, union s3c_iobank *); | |
99 | struct s3c_cpufreq_config *cfg; | |
100 | struct s3c_iotimings *iot; | |
101 | union s3c_iobank *iob; | |
102 | int bank; | |
103 | ||
104 | cfg = s3c_cpufreq_getconfig(); | |
105 | if (!cfg) { | |
106 | seq_printf(seq, "no configuration registered\n"); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | show_bank = cfg->info->debug_io_show; | |
111 | if (!show_bank) { | |
112 | seq_printf(seq, "no code to show bank timing\n"); | |
113 | return 0; | |
114 | } | |
115 | ||
116 | iot = s3c_cpufreq_getiotimings(); | |
117 | if (!iot) { | |
118 | seq_printf(seq, "no io timings registered\n"); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | seq_printf(seq, "hclk period is %lu.%lu ns\n", print_ns(cfg->freq.hclk_tns)); | |
123 | ||
124 | for (bank = 0; bank < MAX_BANKS; bank++) { | |
125 | iob = &iot->bank[bank]; | |
126 | ||
127 | seq_printf(seq, "bank %d: ", bank); | |
128 | ||
129 | if (!iob->io_2410) { | |
130 | seq_printf(seq, "nothing set\n"); | |
131 | continue; | |
132 | } | |
133 | ||
134 | show_bank(seq, cfg, iob); | |
135 | } | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
6e218d21 | 140 | DEFINE_SHOW_ATTRIBUTE(io); |
e6d197a6 BD |
141 | |
142 | static int __init s3c_freq_debugfs_init(void) | |
143 | { | |
144 | dbgfs_root = debugfs_create_dir("s3c-cpufreq", NULL); | |
145 | if (IS_ERR(dbgfs_root)) { | |
b49c22a6 | 146 | pr_err("%s: error creating debugfs root\n", __func__); |
e6d197a6 BD |
147 | return PTR_ERR(dbgfs_root); |
148 | } | |
149 | ||
150 | dbgfs_file_io = debugfs_create_file("io-timing", S_IRUGO, dbgfs_root, | |
6e218d21 | 151 | NULL, &io_fops); |
e6d197a6 BD |
152 | |
153 | dbgfs_file_info = debugfs_create_file("info", S_IRUGO, dbgfs_root, | |
6e218d21 | 154 | NULL, &info_fops); |
e6d197a6 BD |
155 | |
156 | dbgfs_file_board = debugfs_create_file("board", S_IRUGO, dbgfs_root, | |
6e218d21 | 157 | NULL, &board_fops); |
e6d197a6 BD |
158 | |
159 | return 0; | |
160 | } | |
161 | ||
162 | late_initcall(s3c_freq_debugfs_init); | |
163 |