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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6edd8ee6 HS |
2 | /* |
3 | * Debugfs support for hosts and cards | |
4 | * | |
5 | * Copyright (C) 2008 Atmel Corporation | |
6edd8ee6 | 6 | */ |
3f102ae9 | 7 | #include <linux/moduleparam.h> |
3ef77af1 | 8 | #include <linux/export.h> |
6edd8ee6 HS |
9 | #include <linux/debugfs.h> |
10 | #include <linux/fs.h> | |
11 | #include <linux/seq_file.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
6edd8ee6 | 13 | #include <linux/stat.h> |
1b676f70 | 14 | #include <linux/fault-inject.h> |
6edd8ee6 | 15 | |
f4b7f927 | 16 | #include <linux/mmc/card.h> |
6edd8ee6 HS |
17 | #include <linux/mmc/host.h> |
18 | ||
19 | #include "core.h" | |
4facdde1 | 20 | #include "card.h" |
5857b29b | 21 | #include "host.h" |
f4b7f927 | 22 | #include "mmc_ops.h" |
6edd8ee6 | 23 | |
34f50508 PF |
24 | #ifdef CONFIG_FAIL_MMC_REQUEST |
25 | ||
26 | static DECLARE_FAULT_ATTR(fail_default_attr); | |
27 | static char *fail_request; | |
28 | module_param(fail_request, charp, 0); | |
29 | ||
30 | #endif /* CONFIG_FAIL_MMC_REQUEST */ | |
31 | ||
6edd8ee6 HS |
32 | /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */ |
33 | static int mmc_ios_show(struct seq_file *s, void *data) | |
34 | { | |
35 | static const char *vdd_str[] = { | |
36 | [8] = "2.0", | |
37 | [9] = "2.1", | |
38 | [10] = "2.2", | |
39 | [11] = "2.3", | |
40 | [12] = "2.4", | |
41 | [13] = "2.5", | |
42 | [14] = "2.6", | |
43 | [15] = "2.7", | |
44 | [16] = "2.8", | |
45 | [17] = "2.9", | |
46 | [18] = "3.0", | |
47 | [19] = "3.1", | |
48 | [20] = "3.2", | |
49 | [21] = "3.3", | |
50 | [22] = "3.4", | |
51 | [23] = "3.5", | |
52 | [24] = "3.6", | |
53 | }; | |
54 | struct mmc_host *host = s->private; | |
55 | struct mmc_ios *ios = &host->ios; | |
56 | const char *str; | |
57 | ||
58 | seq_printf(s, "clock:\t\t%u Hz\n", ios->clock); | |
df16219f GC |
59 | if (host->actual_clock) |
60 | seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock); | |
6edd8ee6 HS |
61 | seq_printf(s, "vdd:\t\t%u ", ios->vdd); |
62 | if ((1 << ios->vdd) & MMC_VDD_165_195) | |
63 | seq_printf(s, "(1.65 - 1.95 V)\n"); | |
64 | else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1) | |
65 | && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1]) | |
66 | seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd], | |
67 | vdd_str[ios->vdd + 1]); | |
68 | else | |
69 | seq_printf(s, "(invalid)\n"); | |
70 | ||
71 | switch (ios->bus_mode) { | |
72 | case MMC_BUSMODE_OPENDRAIN: | |
73 | str = "open drain"; | |
74 | break; | |
75 | case MMC_BUSMODE_PUSHPULL: | |
76 | str = "push-pull"; | |
77 | break; | |
78 | default: | |
79 | str = "invalid"; | |
80 | break; | |
81 | } | |
82 | seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str); | |
83 | ||
84 | switch (ios->chip_select) { | |
85 | case MMC_CS_DONTCARE: | |
86 | str = "don't care"; | |
87 | break; | |
88 | case MMC_CS_HIGH: | |
89 | str = "active high"; | |
90 | break; | |
91 | case MMC_CS_LOW: | |
92 | str = "active low"; | |
93 | break; | |
94 | default: | |
95 | str = "invalid"; | |
96 | break; | |
97 | } | |
98 | seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str); | |
99 | ||
100 | switch (ios->power_mode) { | |
101 | case MMC_POWER_OFF: | |
102 | str = "off"; | |
103 | break; | |
104 | case MMC_POWER_UP: | |
105 | str = "up"; | |
106 | break; | |
107 | case MMC_POWER_ON: | |
108 | str = "on"; | |
109 | break; | |
110 | default: | |
111 | str = "invalid"; | |
112 | break; | |
113 | } | |
114 | seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str); | |
115 | seq_printf(s, "bus width:\t%u (%u bits)\n", | |
116 | ios->bus_width, 1 << ios->bus_width); | |
117 | ||
118 | switch (ios->timing) { | |
119 | case MMC_TIMING_LEGACY: | |
120 | str = "legacy"; | |
121 | break; | |
122 | case MMC_TIMING_MMC_HS: | |
123 | str = "mmc high-speed"; | |
124 | break; | |
125 | case MMC_TIMING_SD_HS: | |
126 | str = "sd high-speed"; | |
127 | break; | |
85f45058 SL |
128 | case MMC_TIMING_UHS_SDR12: |
129 | str = "sd uhs SDR12"; | |
130 | break; | |
131 | case MMC_TIMING_UHS_SDR25: | |
132 | str = "sd uhs SDR25"; | |
133 | break; | |
cd8a3666 AL |
134 | case MMC_TIMING_UHS_SDR50: |
135 | str = "sd uhs SDR50"; | |
136 | break; | |
137 | case MMC_TIMING_UHS_SDR104: | |
138 | str = "sd uhs SDR104"; | |
139 | break; | |
140 | case MMC_TIMING_UHS_DDR50: | |
141 | str = "sd uhs DDR50"; | |
142 | break; | |
79f7ae7c SJ |
143 | case MMC_TIMING_MMC_DDR52: |
144 | str = "mmc DDR52"; | |
145 | break; | |
a4924c71 | 146 | case MMC_TIMING_MMC_HS200: |
577fb131 | 147 | str = "mmc HS200"; |
a4924c71 | 148 | break; |
0a5b6438 | 149 | case MMC_TIMING_MMC_HS400: |
bc26235b SL |
150 | str = mmc_card_hs400es(host->card) ? |
151 | "mmc HS400 enhanced strobe" : "mmc HS400"; | |
0a5b6438 | 152 | break; |
6edd8ee6 HS |
153 | default: |
154 | str = "invalid"; | |
155 | break; | |
156 | } | |
157 | seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str); | |
158 | ||
42cd95a0 JR |
159 | switch (ios->signal_voltage) { |
160 | case MMC_SIGNAL_VOLTAGE_330: | |
161 | str = "3.30 V"; | |
162 | break; | |
163 | case MMC_SIGNAL_VOLTAGE_180: | |
164 | str = "1.80 V"; | |
165 | break; | |
166 | case MMC_SIGNAL_VOLTAGE_120: | |
167 | str = "1.20 V"; | |
168 | break; | |
169 | default: | |
170 | str = "invalid"; | |
171 | break; | |
172 | } | |
0036e746 | 173 | seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str); |
42cd95a0 | 174 | |
d1f23f93 SL |
175 | switch (ios->drv_type) { |
176 | case MMC_SET_DRIVER_TYPE_A: | |
177 | str = "driver type A"; | |
178 | break; | |
179 | case MMC_SET_DRIVER_TYPE_B: | |
180 | str = "driver type B"; | |
181 | break; | |
182 | case MMC_SET_DRIVER_TYPE_C: | |
183 | str = "driver type C"; | |
184 | break; | |
185 | case MMC_SET_DRIVER_TYPE_D: | |
186 | str = "driver type D"; | |
187 | break; | |
188 | default: | |
189 | str = "invalid"; | |
190 | break; | |
191 | } | |
192 | seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str); | |
193 | ||
6edd8ee6 HS |
194 | return 0; |
195 | } | |
871cfe05 | 196 | DEFINE_SHOW_ATTRIBUTE(mmc_ios); |
6edd8ee6 | 197 | |
703aae3d AS |
198 | static int mmc_clock_opt_get(void *data, u64 *val) |
199 | { | |
200 | struct mmc_host *host = data; | |
201 | ||
202 | *val = host->ios.clock; | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | static int mmc_clock_opt_set(void *data, u64 val) | |
208 | { | |
209 | struct mmc_host *host = data; | |
210 | ||
211 | /* We need this check due to input value is u64 */ | |
e5905ff1 | 212 | if (val != 0 && (val > host->f_max || val < host->f_min)) |
703aae3d AS |
213 | return -EINVAL; |
214 | ||
215 | mmc_claim_host(host); | |
216 | mmc_set_clock(host, (unsigned int) val); | |
217 | mmc_release_host(host); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
222 | DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, | |
223 | "%llu\n"); | |
224 | ||
6edd8ee6 HS |
225 | void mmc_add_host_debugfs(struct mmc_host *host) |
226 | { | |
227 | struct dentry *root; | |
228 | ||
229 | root = debugfs_create_dir(mmc_hostname(host), NULL); | |
230 | if (IS_ERR(root)) | |
231 | /* Don't complain -- debugfs just isn't enabled */ | |
232 | return; | |
233 | if (!root) | |
234 | /* Complain -- debugfs is enabled, but it failed to | |
235 | * create the directory. */ | |
236 | goto err_root; | |
237 | ||
238 | host->debugfs_root = root; | |
239 | ||
240 | if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops)) | |
703aae3d AS |
241 | goto err_node; |
242 | ||
9c5c685e AR |
243 | if (!debugfs_create_x32("caps", S_IRUSR, root, &host->caps)) |
244 | goto err_node; | |
245 | ||
246 | if (!debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2)) | |
247 | goto err_node; | |
248 | ||
703aae3d AS |
249 | if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host, |
250 | &mmc_clock_fops)) | |
251 | goto err_node; | |
6edd8ee6 | 252 | |
1b676f70 | 253 | #ifdef CONFIG_FAIL_MMC_REQUEST |
34f50508 PF |
254 | if (fail_request) |
255 | setup_fault_attr(&fail_default_attr, fail_request); | |
256 | host->fail_mmc_request = fail_default_attr; | |
1b676f70 PF |
257 | if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request", |
258 | root, | |
259 | &host->fail_mmc_request))) | |
260 | goto err_node; | |
04566831 | 261 | #endif |
6edd8ee6 HS |
262 | return; |
263 | ||
703aae3d | 264 | err_node: |
6edd8ee6 HS |
265 | debugfs_remove_recursive(root); |
266 | host->debugfs_root = NULL; | |
267 | err_root: | |
268 | dev_err(&host->class_dev, "failed to initialize debugfs\n"); | |
269 | } | |
270 | ||
271 | void mmc_remove_host_debugfs(struct mmc_host *host) | |
272 | { | |
273 | debugfs_remove_recursive(host->debugfs_root); | |
274 | } | |
f4b7f927 | 275 | |
f4b7f927 HS |
276 | void mmc_add_card_debugfs(struct mmc_card *card) |
277 | { | |
278 | struct mmc_host *host = card->host; | |
279 | struct dentry *root; | |
280 | ||
281 | if (!host->debugfs_root) | |
282 | return; | |
283 | ||
284 | root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root); | |
285 | if (IS_ERR(root)) | |
286 | /* Don't complain -- debugfs just isn't enabled */ | |
287 | return; | |
288 | if (!root) | |
289 | /* Complain -- debugfs is enabled, but it failed to | |
290 | * create the directory. */ | |
291 | goto err; | |
292 | ||
293 | card->debugfs_root = root; | |
294 | ||
295 | if (!debugfs_create_x32("state", S_IRUSR, root, &card->state)) | |
296 | goto err; | |
297 | ||
f4b7f927 HS |
298 | return; |
299 | ||
300 | err: | |
301 | debugfs_remove_recursive(root); | |
302 | card->debugfs_root = NULL; | |
303 | dev_err(&card->dev, "failed to initialize debugfs\n"); | |
304 | } | |
305 | ||
306 | void mmc_remove_card_debugfs(struct mmc_card *card) | |
307 | { | |
308 | debugfs_remove_recursive(card->debugfs_root); | |
f9f0da98 | 309 | card->debugfs_root = NULL; |
f4b7f927 | 310 | } |