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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 */
10#include <linux/moduleparam.h>
11#include <linux/export.h>
12#include <linux/debugfs.h>
13#include <linux/fs.h>
14#include <linux/seq_file.h>
15#include <linux/slab.h>
16#include <linux/stat.h>
17#include <linux/fault-inject.h>
18
19#include <linux/mmc/card.h>
20#include <linux/mmc/host.h>
21
22#include "core.h"
23#include "mmc_ops.h"
24
25#ifdef CONFIG_FAIL_MMC_REQUEST
26
27static DECLARE_FAULT_ATTR(fail_default_attr);
28static char *fail_request;
29module_param(fail_request, charp, 0);
30
31#endif /* CONFIG_FAIL_MMC_REQUEST */
32
33/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
34static int mmc_ios_show(struct seq_file *s, void *data)
35{
36 static const char *vdd_str[] = {
37 [8] = "2.0",
38 [9] = "2.1",
39 [10] = "2.2",
40 [11] = "2.3",
41 [12] = "2.4",
42 [13] = "2.5",
43 [14] = "2.6",
44 [15] = "2.7",
45 [16] = "2.8",
46 [17] = "2.9",
47 [18] = "3.0",
48 [19] = "3.1",
49 [20] = "3.2",
50 [21] = "3.3",
51 [22] = "3.4",
52 [23] = "3.5",
53 [24] = "3.6",
54 };
55 struct mmc_host *host = s->private;
56 struct mmc_ios *ios = &host->ios;
57 const char *str;
58
59 seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
60 if (host->actual_clock)
61 seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
62 seq_printf(s, "vdd:\t\t%u ", ios->vdd);
63 if ((1 << ios->vdd) & MMC_VDD_165_195)
64 seq_printf(s, "(1.65 - 1.95 V)\n");
65 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
66 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
67 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
68 vdd_str[ios->vdd + 1]);
69 else
70 seq_printf(s, "(invalid)\n");
71
72 switch (ios->bus_mode) {
73 case MMC_BUSMODE_OPENDRAIN:
74 str = "open drain";
75 break;
76 case MMC_BUSMODE_PUSHPULL:
77 str = "push-pull";
78 break;
79 default:
80 str = "invalid";
81 break;
82 }
83 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
84
85 switch (ios->chip_select) {
86 case MMC_CS_DONTCARE:
87 str = "don't care";
88 break;
89 case MMC_CS_HIGH:
90 str = "active high";
91 break;
92 case MMC_CS_LOW:
93 str = "active low";
94 break;
95 default:
96 str = "invalid";
97 break;
98 }
99 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
100
101 switch (ios->power_mode) {
102 case MMC_POWER_OFF:
103 str = "off";
104 break;
105 case MMC_POWER_UP:
106 str = "up";
107 break;
108 case MMC_POWER_ON:
109 str = "on";
110 break;
111 default:
112 str = "invalid";
113 break;
114 }
115 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
116 seq_printf(s, "bus width:\t%u (%u bits)\n",
117 ios->bus_width, 1 << ios->bus_width);
118
119 switch (ios->timing) {
120 case MMC_TIMING_LEGACY:
121 str = "legacy";
122 break;
123 case MMC_TIMING_MMC_HS:
124 str = "mmc high-speed";
125 break;
126 case MMC_TIMING_SD_HS:
127 str = "sd high-speed";
128 break;
129 case MMC_TIMING_UHS_SDR12:
130 str = "sd uhs SDR12";
131 break;
132 case MMC_TIMING_UHS_SDR25:
133 str = "sd uhs SDR25";
134 break;
135 case MMC_TIMING_UHS_SDR50:
136 str = "sd uhs SDR50";
137 break;
138 case MMC_TIMING_UHS_SDR104:
139 str = "sd uhs SDR104";
140 break;
141 case MMC_TIMING_UHS_DDR50:
142 str = "sd uhs DDR50";
143 break;
144 case MMC_TIMING_MMC_DDR52:
145 str = "mmc DDR52";
146 break;
147 case MMC_TIMING_MMC_HS200:
148 str = "mmc HS200";
149 break;
150 case MMC_TIMING_MMC_HS400:
151 str = "mmc HS400";
152 break;
153 default:
154 str = "invalid";
155 break;
156 }
157 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
158
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 }
173 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
174
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
194 return 0;
195}
196
197static int mmc_ios_open(struct inode *inode, struct file *file)
198{
199 return single_open(file, mmc_ios_show, inode->i_private);
200}
201
202static const struct file_operations mmc_ios_fops = {
203 .open = mmc_ios_open,
204 .read = seq_read,
205 .llseek = seq_lseek,
206 .release = single_release,
207};
208
209static int mmc_clock_opt_get(void *data, u64 *val)
210{
211 struct mmc_host *host = data;
212
213 *val = host->ios.clock;
214
215 return 0;
216}
217
218static int mmc_clock_opt_set(void *data, u64 val)
219{
220 struct mmc_host *host = data;
221
222 /* We need this check due to input value is u64 */
223 if (val != 0 && (val > host->f_max || val < host->f_min))
224 return -EINVAL;
225
226 mmc_claim_host(host);
227 mmc_set_clock(host, (unsigned int) val);
228 mmc_release_host(host);
229
230 return 0;
231}
232
233DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
234 "%llu\n");
235
236void mmc_add_host_debugfs(struct mmc_host *host)
237{
238 struct dentry *root;
239
240 root = debugfs_create_dir(mmc_hostname(host), NULL);
241 if (IS_ERR(root))
242 /* Don't complain -- debugfs just isn't enabled */
243 return;
244 if (!root)
245 /* Complain -- debugfs is enabled, but it failed to
246 * create the directory. */
247 goto err_root;
248
249 host->debugfs_root = root;
250
251 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
252 goto err_node;
253
254 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
255 &mmc_clock_fops))
256 goto err_node;
257
258#ifdef CONFIG_FAIL_MMC_REQUEST
259 if (fail_request)
260 setup_fault_attr(&fail_default_attr, fail_request);
261 host->fail_mmc_request = fail_default_attr;
262 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
263 root,
264 &host->fail_mmc_request)))
265 goto err_node;
266#endif
267 return;
268
269err_node:
270 debugfs_remove_recursive(root);
271 host->debugfs_root = NULL;
272err_root:
273 dev_err(&host->class_dev, "failed to initialize debugfs\n");
274}
275
276void mmc_remove_host_debugfs(struct mmc_host *host)
277{
278 debugfs_remove_recursive(host->debugfs_root);
279}
280
281static int mmc_dbg_card_status_get(void *data, u64 *val)
282{
283 struct mmc_card *card = data;
284 u32 status;
285 int ret;
286
287 mmc_get_card(card);
288
289 ret = mmc_send_status(data, &status);
290 if (!ret)
291 *val = status;
292
293 mmc_put_card(card);
294
295 return ret;
296}
297DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
298 NULL, "%08llx\n");
299
300#define EXT_CSD_STR_LEN 1025
301
302static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
303{
304 struct mmc_card *card = inode->i_private;
305 char *buf;
306 ssize_t n = 0;
307 u8 *ext_csd;
308 int err, i;
309
310 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
311 if (!buf)
312 return -ENOMEM;
313
314 mmc_get_card(card);
315 err = mmc_get_ext_csd(card, &ext_csd);
316 mmc_put_card(card);
317 if (err)
318 goto out_free;
319
320 for (i = 0; i < 512; i++)
321 n += sprintf(buf + n, "%02x", ext_csd[i]);
322 n += sprintf(buf + n, "\n");
323 BUG_ON(n != EXT_CSD_STR_LEN);
324
325 filp->private_data = buf;
326 kfree(ext_csd);
327 return 0;
328
329out_free:
330 kfree(buf);
331 return err;
332}
333
334static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
335 size_t cnt, loff_t *ppos)
336{
337 char *buf = filp->private_data;
338
339 return simple_read_from_buffer(ubuf, cnt, ppos,
340 buf, EXT_CSD_STR_LEN);
341}
342
343static int mmc_ext_csd_release(struct inode *inode, struct file *file)
344{
345 kfree(file->private_data);
346 return 0;
347}
348
349static const struct file_operations mmc_dbg_ext_csd_fops = {
350 .open = mmc_ext_csd_open,
351 .read = mmc_ext_csd_read,
352 .release = mmc_ext_csd_release,
353 .llseek = default_llseek,
354};
355
356void mmc_add_card_debugfs(struct mmc_card *card)
357{
358 struct mmc_host *host = card->host;
359 struct dentry *root;
360
361 if (!host->debugfs_root)
362 return;
363
364 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
365 if (IS_ERR(root))
366 /* Don't complain -- debugfs just isn't enabled */
367 return;
368 if (!root)
369 /* Complain -- debugfs is enabled, but it failed to
370 * create the directory. */
371 goto err;
372
373 card->debugfs_root = root;
374
375 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
376 goto err;
377
378 if (mmc_card_mmc(card) || mmc_card_sd(card))
379 if (!debugfs_create_file("status", S_IRUSR, root, card,
380 &mmc_dbg_card_status_fops))
381 goto err;
382
383 if (mmc_card_mmc(card))
384 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
385 &mmc_dbg_ext_csd_fops))
386 goto err;
387
388 return;
389
390err:
391 debugfs_remove_recursive(root);
392 card->debugfs_root = NULL;
393 dev_err(&card->dev, "failed to initialize debugfs\n");
394}
395
396void mmc_remove_card_debugfs(struct mmc_card *card)
397{
398 debugfs_remove_recursive(card->debugfs_root);
399}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Debugfs support for hosts and cards
4 *
5 * Copyright (C) 2008 Atmel Corporation
6 */
7#include <linux/moduleparam.h>
8#include <linux/export.h>
9#include <linux/debugfs.h>
10#include <linux/fs.h>
11#include <linux/seq_file.h>
12#include <linux/slab.h>
13#include <linux/stat.h>
14#include <linux/fault-inject.h>
15
16#include <linux/mmc/card.h>
17#include <linux/mmc/host.h>
18
19#include "core.h"
20#include "card.h"
21#include "host.h"
22#include "mmc_ops.h"
23
24#ifdef CONFIG_FAIL_MMC_REQUEST
25
26static DECLARE_FAULT_ATTR(fail_default_attr);
27static char *fail_request;
28module_param(fail_request, charp, 0);
29
30#endif /* CONFIG_FAIL_MMC_REQUEST */
31
32/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
33static 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);
59 if (host->actual_clock)
60 seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
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;
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;
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;
143 case MMC_TIMING_MMC_DDR52:
144 str = "mmc DDR52";
145 break;
146 case MMC_TIMING_MMC_HS200:
147 str = "mmc HS200";
148 break;
149 case MMC_TIMING_MMC_HS400:
150 str = mmc_card_hs400es(host->card) ?
151 "mmc HS400 enhanced strobe" : "mmc HS400";
152 break;
153 default:
154 str = "invalid";
155 break;
156 }
157 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
158
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 }
173 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
174
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
194 return 0;
195}
196DEFINE_SHOW_ATTRIBUTE(mmc_ios);
197
198static 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
207static 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 */
212 if (val != 0 && (val > host->f_max || val < host->f_min))
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
222DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
223 "%llu\n");
224
225void mmc_add_host_debugfs(struct mmc_host *host)
226{
227 struct dentry *root;
228
229 root = debugfs_create_dir(mmc_hostname(host), NULL);
230 host->debugfs_root = root;
231
232 debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops);
233 debugfs_create_x32("caps", S_IRUSR, root, &host->caps);
234 debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2);
235 debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
236 &mmc_clock_fops);
237
238#ifdef CONFIG_FAIL_MMC_REQUEST
239 if (fail_request)
240 setup_fault_attr(&fail_default_attr, fail_request);
241 host->fail_mmc_request = fail_default_attr;
242 fault_create_debugfs_attr("fail_mmc_request", root,
243 &host->fail_mmc_request);
244#endif
245}
246
247void mmc_remove_host_debugfs(struct mmc_host *host)
248{
249 debugfs_remove_recursive(host->debugfs_root);
250}
251
252void mmc_add_card_debugfs(struct mmc_card *card)
253{
254 struct mmc_host *host = card->host;
255 struct dentry *root;
256
257 if (!host->debugfs_root)
258 return;
259
260 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
261 card->debugfs_root = root;
262
263 debugfs_create_x32("state", S_IRUSR, root, &card->state);
264}
265
266void mmc_remove_card_debugfs(struct mmc_card *card)
267{
268 debugfs_remove_recursive(card->debugfs_root);
269 card->debugfs_root = NULL;
270}