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Commit | Line | Data |
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6edd8ee6 HS |
1 | /* |
2 | * Debugfs support for hosts and cards | |
3 | * | |
4 | * Copyright (C) 2008 Atmel Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
3f102ae9 | 10 | #include <linux/moduleparam.h> |
3ef77af1 | 11 | #include <linux/export.h> |
6edd8ee6 HS |
12 | #include <linux/debugfs.h> |
13 | #include <linux/fs.h> | |
14 | #include <linux/seq_file.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
6edd8ee6 | 16 | #include <linux/stat.h> |
1b676f70 | 17 | #include <linux/fault-inject.h> |
6edd8ee6 | 18 | |
f4b7f927 | 19 | #include <linux/mmc/card.h> |
6edd8ee6 HS |
20 | #include <linux/mmc/host.h> |
21 | ||
22 | #include "core.h" | |
4facdde1 | 23 | #include "card.h" |
5857b29b | 24 | #include "host.h" |
f4b7f927 | 25 | #include "mmc_ops.h" |
6edd8ee6 | 26 | |
34f50508 PF |
27 | #ifdef CONFIG_FAIL_MMC_REQUEST |
28 | ||
29 | static DECLARE_FAULT_ATTR(fail_default_attr); | |
30 | static char *fail_request; | |
31 | module_param(fail_request, charp, 0); | |
32 | ||
33 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
34 | ||
6edd8ee6 HS |
35 | /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */ |
36 | static int mmc_ios_show(struct seq_file *s, void *data) | |
37 | { | |
38 | static const char *vdd_str[] = { | |
39 | [8] = "2.0", | |
40 | [9] = "2.1", | |
41 | [10] = "2.2", | |
42 | [11] = "2.3", | |
43 | [12] = "2.4", | |
44 | [13] = "2.5", | |
45 | [14] = "2.6", | |
46 | [15] = "2.7", | |
47 | [16] = "2.8", | |
48 | [17] = "2.9", | |
49 | [18] = "3.0", | |
50 | [19] = "3.1", | |
51 | [20] = "3.2", | |
52 | [21] = "3.3", | |
53 | [22] = "3.4", | |
54 | [23] = "3.5", | |
55 | [24] = "3.6", | |
56 | }; | |
57 | struct mmc_host *host = s->private; | |
58 | struct mmc_ios *ios = &host->ios; | |
59 | const char *str; | |
60 | ||
61 | seq_printf(s, "clock:\t\t%u Hz\n", ios->clock); | |
df16219f GC |
62 | if (host->actual_clock) |
63 | seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock); | |
6edd8ee6 HS |
64 | seq_printf(s, "vdd:\t\t%u ", ios->vdd); |
65 | if ((1 << ios->vdd) & MMC_VDD_165_195) | |
66 | seq_printf(s, "(1.65 - 1.95 V)\n"); | |
67 | else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1) | |
68 | && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1]) | |
69 | seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd], | |
70 | vdd_str[ios->vdd + 1]); | |
71 | else | |
72 | seq_printf(s, "(invalid)\n"); | |
73 | ||
74 | switch (ios->bus_mode) { | |
75 | case MMC_BUSMODE_OPENDRAIN: | |
76 | str = "open drain"; | |
77 | break; | |
78 | case MMC_BUSMODE_PUSHPULL: | |
79 | str = "push-pull"; | |
80 | break; | |
81 | default: | |
82 | str = "invalid"; | |
83 | break; | |
84 | } | |
85 | seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str); | |
86 | ||
87 | switch (ios->chip_select) { | |
88 | case MMC_CS_DONTCARE: | |
89 | str = "don't care"; | |
90 | break; | |
91 | case MMC_CS_HIGH: | |
92 | str = "active high"; | |
93 | break; | |
94 | case MMC_CS_LOW: | |
95 | str = "active low"; | |
96 | break; | |
97 | default: | |
98 | str = "invalid"; | |
99 | break; | |
100 | } | |
101 | seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str); | |
102 | ||
103 | switch (ios->power_mode) { | |
104 | case MMC_POWER_OFF: | |
105 | str = "off"; | |
106 | break; | |
107 | case MMC_POWER_UP: | |
108 | str = "up"; | |
109 | break; | |
110 | case MMC_POWER_ON: | |
111 | str = "on"; | |
112 | break; | |
113 | default: | |
114 | str = "invalid"; | |
115 | break; | |
116 | } | |
117 | seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str); | |
118 | seq_printf(s, "bus width:\t%u (%u bits)\n", | |
119 | ios->bus_width, 1 << ios->bus_width); | |
120 | ||
121 | switch (ios->timing) { | |
122 | case MMC_TIMING_LEGACY: | |
123 | str = "legacy"; | |
124 | break; | |
125 | case MMC_TIMING_MMC_HS: | |
126 | str = "mmc high-speed"; | |
127 | break; | |
128 | case MMC_TIMING_SD_HS: | |
129 | str = "sd high-speed"; | |
130 | break; | |
85f45058 SL |
131 | case MMC_TIMING_UHS_SDR12: |
132 | str = "sd uhs SDR12"; | |
133 | break; | |
134 | case MMC_TIMING_UHS_SDR25: | |
135 | str = "sd uhs SDR25"; | |
136 | break; | |
cd8a3666 AL |
137 | case MMC_TIMING_UHS_SDR50: |
138 | str = "sd uhs SDR50"; | |
139 | break; | |
140 | case MMC_TIMING_UHS_SDR104: | |
141 | str = "sd uhs SDR104"; | |
142 | break; | |
143 | case MMC_TIMING_UHS_DDR50: | |
144 | str = "sd uhs DDR50"; | |
145 | break; | |
79f7ae7c SJ |
146 | case MMC_TIMING_MMC_DDR52: |
147 | str = "mmc DDR52"; | |
148 | break; | |
a4924c71 | 149 | case MMC_TIMING_MMC_HS200: |
577fb131 | 150 | str = "mmc HS200"; |
a4924c71 | 151 | break; |
0a5b6438 | 152 | case MMC_TIMING_MMC_HS400: |
bc26235b SL |
153 | str = mmc_card_hs400es(host->card) ? |
154 | "mmc HS400 enhanced strobe" : "mmc HS400"; | |
0a5b6438 | 155 | break; |
6edd8ee6 HS |
156 | default: |
157 | str = "invalid"; | |
158 | break; | |
159 | } | |
160 | seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str); | |
161 | ||
42cd95a0 JR |
162 | switch (ios->signal_voltage) { |
163 | case MMC_SIGNAL_VOLTAGE_330: | |
164 | str = "3.30 V"; | |
165 | break; | |
166 | case MMC_SIGNAL_VOLTAGE_180: | |
167 | str = "1.80 V"; | |
168 | break; | |
169 | case MMC_SIGNAL_VOLTAGE_120: | |
170 | str = "1.20 V"; | |
171 | break; | |
172 | default: | |
173 | str = "invalid"; | |
174 | break; | |
175 | } | |
0036e746 | 176 | seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str); |
42cd95a0 | 177 | |
d1f23f93 SL |
178 | switch (ios->drv_type) { |
179 | case MMC_SET_DRIVER_TYPE_A: | |
180 | str = "driver type A"; | |
181 | break; | |
182 | case MMC_SET_DRIVER_TYPE_B: | |
183 | str = "driver type B"; | |
184 | break; | |
185 | case MMC_SET_DRIVER_TYPE_C: | |
186 | str = "driver type C"; | |
187 | break; | |
188 | case MMC_SET_DRIVER_TYPE_D: | |
189 | str = "driver type D"; | |
190 | break; | |
191 | default: | |
192 | str = "invalid"; | |
193 | break; | |
194 | } | |
195 | seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str); | |
196 | ||
6edd8ee6 HS |
197 | return 0; |
198 | } | |
199 | ||
200 | static int mmc_ios_open(struct inode *inode, struct file *file) | |
201 | { | |
202 | return single_open(file, mmc_ios_show, inode->i_private); | |
203 | } | |
204 | ||
205 | static const struct file_operations mmc_ios_fops = { | |
206 | .open = mmc_ios_open, | |
207 | .read = seq_read, | |
208 | .llseek = seq_lseek, | |
209 | .release = single_release, | |
210 | }; | |
211 | ||
703aae3d AS |
212 | static int mmc_clock_opt_get(void *data, u64 *val) |
213 | { | |
214 | struct mmc_host *host = data; | |
215 | ||
216 | *val = host->ios.clock; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static int mmc_clock_opt_set(void *data, u64 val) | |
222 | { | |
223 | struct mmc_host *host = data; | |
224 | ||
225 | /* We need this check due to input value is u64 */ | |
e5905ff1 | 226 | if (val != 0 && (val > host->f_max || val < host->f_min)) |
703aae3d AS |
227 | return -EINVAL; |
228 | ||
229 | mmc_claim_host(host); | |
230 | mmc_set_clock(host, (unsigned int) val); | |
231 | mmc_release_host(host); | |
232 | ||
233 | return 0; | |
234 | } | |
235 | ||
236 | DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, | |
237 | "%llu\n"); | |
238 | ||
6edd8ee6 HS |
239 | void mmc_add_host_debugfs(struct mmc_host *host) |
240 | { | |
241 | struct dentry *root; | |
242 | ||
243 | root = debugfs_create_dir(mmc_hostname(host), NULL); | |
244 | if (IS_ERR(root)) | |
245 | /* Don't complain -- debugfs just isn't enabled */ | |
246 | return; | |
247 | if (!root) | |
248 | /* Complain -- debugfs is enabled, but it failed to | |
249 | * create the directory. */ | |
250 | goto err_root; | |
251 | ||
252 | host->debugfs_root = root; | |
253 | ||
254 | if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops)) | |
703aae3d AS |
255 | goto err_node; |
256 | ||
257 | if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host, | |
258 | &mmc_clock_fops)) | |
259 | goto err_node; | |
6edd8ee6 | 260 | |
1b676f70 | 261 | #ifdef CONFIG_FAIL_MMC_REQUEST |
34f50508 PF |
262 | if (fail_request) |
263 | setup_fault_attr(&fail_default_attr, fail_request); | |
264 | host->fail_mmc_request = fail_default_attr; | |
1b676f70 PF |
265 | if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request", |
266 | root, | |
267 | &host->fail_mmc_request))) | |
268 | goto err_node; | |
04566831 | 269 | #endif |
6edd8ee6 HS |
270 | return; |
271 | ||
703aae3d | 272 | err_node: |
6edd8ee6 HS |
273 | debugfs_remove_recursive(root); |
274 | host->debugfs_root = NULL; | |
275 | err_root: | |
276 | dev_err(&host->class_dev, "failed to initialize debugfs\n"); | |
277 | } | |
278 | ||
279 | void mmc_remove_host_debugfs(struct mmc_host *host) | |
280 | { | |
281 | debugfs_remove_recursive(host->debugfs_root); | |
282 | } | |
f4b7f927 | 283 | |
f4b7f927 HS |
284 | void mmc_add_card_debugfs(struct mmc_card *card) |
285 | { | |
286 | struct mmc_host *host = card->host; | |
287 | struct dentry *root; | |
288 | ||
289 | if (!host->debugfs_root) | |
290 | return; | |
291 | ||
292 | root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root); | |
293 | if (IS_ERR(root)) | |
294 | /* Don't complain -- debugfs just isn't enabled */ | |
295 | return; | |
296 | if (!root) | |
297 | /* Complain -- debugfs is enabled, but it failed to | |
298 | * create the directory. */ | |
299 | goto err; | |
300 | ||
301 | card->debugfs_root = root; | |
302 | ||
303 | if (!debugfs_create_x32("state", S_IRUSR, root, &card->state)) | |
304 | goto err; | |
305 | ||
f4b7f927 HS |
306 | return; |
307 | ||
308 | err: | |
309 | debugfs_remove_recursive(root); | |
310 | card->debugfs_root = NULL; | |
311 | dev_err(&card->dev, "failed to initialize debugfs\n"); | |
312 | } | |
313 | ||
314 | void mmc_remove_card_debugfs(struct mmc_card *card) | |
315 | { | |
316 | debugfs_remove_recursive(card->debugfs_root); | |
f9f0da98 | 317 | card->debugfs_root = NULL; |
f4b7f927 | 318 | } |