Loading...
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/debugfs.h>
11#include <linux/fs.h>
12#include <linux/seq_file.h>
13#include <linux/slab.h>
14#include <linux/stat.h>
15
16#include <linux/mmc/card.h>
17#include <linux/mmc/host.h>
18
19#include "core.h"
20#include "mmc_ops.h"
21
22/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
23static int mmc_ios_show(struct seq_file *s, void *data)
24{
25 static const char *vdd_str[] = {
26 [8] = "2.0",
27 [9] = "2.1",
28 [10] = "2.2",
29 [11] = "2.3",
30 [12] = "2.4",
31 [13] = "2.5",
32 [14] = "2.6",
33 [15] = "2.7",
34 [16] = "2.8",
35 [17] = "2.9",
36 [18] = "3.0",
37 [19] = "3.1",
38 [20] = "3.2",
39 [21] = "3.3",
40 [22] = "3.4",
41 [23] = "3.5",
42 [24] = "3.6",
43 };
44 struct mmc_host *host = s->private;
45 struct mmc_ios *ios = &host->ios;
46 const char *str;
47
48 seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
49 seq_printf(s, "vdd:\t\t%u ", ios->vdd);
50 if ((1 << ios->vdd) & MMC_VDD_165_195)
51 seq_printf(s, "(1.65 - 1.95 V)\n");
52 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
53 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
54 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
55 vdd_str[ios->vdd + 1]);
56 else
57 seq_printf(s, "(invalid)\n");
58
59 switch (ios->bus_mode) {
60 case MMC_BUSMODE_OPENDRAIN:
61 str = "open drain";
62 break;
63 case MMC_BUSMODE_PUSHPULL:
64 str = "push-pull";
65 break;
66 default:
67 str = "invalid";
68 break;
69 }
70 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
71
72 switch (ios->chip_select) {
73 case MMC_CS_DONTCARE:
74 str = "don't care";
75 break;
76 case MMC_CS_HIGH:
77 str = "active high";
78 break;
79 case MMC_CS_LOW:
80 str = "active low";
81 break;
82 default:
83 str = "invalid";
84 break;
85 }
86 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
87
88 switch (ios->power_mode) {
89 case MMC_POWER_OFF:
90 str = "off";
91 break;
92 case MMC_POWER_UP:
93 str = "up";
94 break;
95 case MMC_POWER_ON:
96 str = "on";
97 break;
98 default:
99 str = "invalid";
100 break;
101 }
102 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
103 seq_printf(s, "bus width:\t%u (%u bits)\n",
104 ios->bus_width, 1 << ios->bus_width);
105
106 switch (ios->timing) {
107 case MMC_TIMING_LEGACY:
108 str = "legacy";
109 break;
110 case MMC_TIMING_MMC_HS:
111 str = "mmc high-speed";
112 break;
113 case MMC_TIMING_SD_HS:
114 str = "sd high-speed";
115 break;
116 default:
117 str = "invalid";
118 break;
119 }
120 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
121
122 return 0;
123}
124
125static int mmc_ios_open(struct inode *inode, struct file *file)
126{
127 return single_open(file, mmc_ios_show, inode->i_private);
128}
129
130static const struct file_operations mmc_ios_fops = {
131 .open = mmc_ios_open,
132 .read = seq_read,
133 .llseek = seq_lseek,
134 .release = single_release,
135};
136
137static int mmc_clock_opt_get(void *data, u64 *val)
138{
139 struct mmc_host *host = data;
140
141 *val = host->ios.clock;
142
143 return 0;
144}
145
146static int mmc_clock_opt_set(void *data, u64 val)
147{
148 struct mmc_host *host = data;
149
150 /* We need this check due to input value is u64 */
151 if (val > host->f_max)
152 return -EINVAL;
153
154 mmc_claim_host(host);
155 mmc_set_clock(host, (unsigned int) val);
156 mmc_release_host(host);
157
158 return 0;
159}
160
161DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
162 "%llu\n");
163
164void mmc_add_host_debugfs(struct mmc_host *host)
165{
166 struct dentry *root;
167
168 root = debugfs_create_dir(mmc_hostname(host), NULL);
169 if (IS_ERR(root))
170 /* Don't complain -- debugfs just isn't enabled */
171 return;
172 if (!root)
173 /* Complain -- debugfs is enabled, but it failed to
174 * create the directory. */
175 goto err_root;
176
177 host->debugfs_root = root;
178
179 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
180 goto err_node;
181
182 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
183 &mmc_clock_fops))
184 goto err_node;
185
186#ifdef CONFIG_MMC_CLKGATE
187 if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
188 root, &host->clk_delay))
189 goto err_node;
190#endif
191 return;
192
193err_node:
194 debugfs_remove_recursive(root);
195 host->debugfs_root = NULL;
196err_root:
197 dev_err(&host->class_dev, "failed to initialize debugfs\n");
198}
199
200void mmc_remove_host_debugfs(struct mmc_host *host)
201{
202 debugfs_remove_recursive(host->debugfs_root);
203}
204
205static int mmc_dbg_card_status_get(void *data, u64 *val)
206{
207 struct mmc_card *card = data;
208 u32 status;
209 int ret;
210
211 mmc_claim_host(card->host);
212
213 ret = mmc_send_status(data, &status);
214 if (!ret)
215 *val = status;
216
217 mmc_release_host(card->host);
218
219 return ret;
220}
221DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
222 NULL, "%08llx\n");
223
224#define EXT_CSD_STR_LEN 1025
225
226static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
227{
228 struct mmc_card *card = inode->i_private;
229 char *buf;
230 ssize_t n = 0;
231 u8 *ext_csd;
232 int err, i;
233
234 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
235 if (!buf)
236 return -ENOMEM;
237
238 ext_csd = kmalloc(512, GFP_KERNEL);
239 if (!ext_csd) {
240 err = -ENOMEM;
241 goto out_free;
242 }
243
244 mmc_claim_host(card->host);
245 err = mmc_send_ext_csd(card, ext_csd);
246 mmc_release_host(card->host);
247 if (err)
248 goto out_free;
249
250 for (i = 511; i >= 0; i--)
251 n += sprintf(buf + n, "%02x", ext_csd[i]);
252 n += sprintf(buf + n, "\n");
253 BUG_ON(n != EXT_CSD_STR_LEN);
254
255 filp->private_data = buf;
256 kfree(ext_csd);
257 return 0;
258
259out_free:
260 kfree(buf);
261 kfree(ext_csd);
262 return err;
263}
264
265static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
266 size_t cnt, loff_t *ppos)
267{
268 char *buf = filp->private_data;
269
270 return simple_read_from_buffer(ubuf, cnt, ppos,
271 buf, EXT_CSD_STR_LEN);
272}
273
274static int mmc_ext_csd_release(struct inode *inode, struct file *file)
275{
276 kfree(file->private_data);
277 return 0;
278}
279
280static const struct file_operations mmc_dbg_ext_csd_fops = {
281 .open = mmc_ext_csd_open,
282 .read = mmc_ext_csd_read,
283 .release = mmc_ext_csd_release,
284 .llseek = default_llseek,
285};
286
287void mmc_add_card_debugfs(struct mmc_card *card)
288{
289 struct mmc_host *host = card->host;
290 struct dentry *root;
291
292 if (!host->debugfs_root)
293 return;
294
295 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
296 if (IS_ERR(root))
297 /* Don't complain -- debugfs just isn't enabled */
298 return;
299 if (!root)
300 /* Complain -- debugfs is enabled, but it failed to
301 * create the directory. */
302 goto err;
303
304 card->debugfs_root = root;
305
306 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
307 goto err;
308
309 if (mmc_card_mmc(card) || mmc_card_sd(card))
310 if (!debugfs_create_file("status", S_IRUSR, root, card,
311 &mmc_dbg_card_status_fops))
312 goto err;
313
314 if (mmc_card_mmc(card))
315 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
316 &mmc_dbg_ext_csd_fops))
317 goto err;
318
319 return;
320
321err:
322 debugfs_remove_recursive(root);
323 card->debugfs_root = NULL;
324 dev_err(&card->dev, "failed to initialize debugfs\n");
325}
326
327void mmc_remove_card_debugfs(struct mmc_card *card)
328{
329 debugfs_remove_recursive(card->debugfs_root);
330}
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_SDR50:
130 str = "sd uhs SDR50";
131 break;
132 case MMC_TIMING_UHS_SDR104:
133 str = "sd uhs SDR104";
134 break;
135 case MMC_TIMING_UHS_DDR50:
136 str = "sd uhs DDR50";
137 break;
138 case MMC_TIMING_MMC_HS200:
139 str = "mmc high-speed SDR200";
140 break;
141 default:
142 str = "invalid";
143 break;
144 }
145 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
146
147 return 0;
148}
149
150static int mmc_ios_open(struct inode *inode, struct file *file)
151{
152 return single_open(file, mmc_ios_show, inode->i_private);
153}
154
155static const struct file_operations mmc_ios_fops = {
156 .open = mmc_ios_open,
157 .read = seq_read,
158 .llseek = seq_lseek,
159 .release = single_release,
160};
161
162static int mmc_clock_opt_get(void *data, u64 *val)
163{
164 struct mmc_host *host = data;
165
166 *val = host->ios.clock;
167
168 return 0;
169}
170
171static int mmc_clock_opt_set(void *data, u64 val)
172{
173 struct mmc_host *host = data;
174
175 /* We need this check due to input value is u64 */
176 if (val > host->f_max)
177 return -EINVAL;
178
179 mmc_claim_host(host);
180 mmc_set_clock(host, (unsigned int) val);
181 mmc_release_host(host);
182
183 return 0;
184}
185
186DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
187 "%llu\n");
188
189void mmc_add_host_debugfs(struct mmc_host *host)
190{
191 struct dentry *root;
192
193 root = debugfs_create_dir(mmc_hostname(host), NULL);
194 if (IS_ERR(root))
195 /* Don't complain -- debugfs just isn't enabled */
196 return;
197 if (!root)
198 /* Complain -- debugfs is enabled, but it failed to
199 * create the directory. */
200 goto err_root;
201
202 host->debugfs_root = root;
203
204 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
205 goto err_node;
206
207 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
208 &mmc_clock_fops))
209 goto err_node;
210
211#ifdef CONFIG_MMC_CLKGATE
212 if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
213 root, &host->clk_delay))
214 goto err_node;
215#endif
216#ifdef CONFIG_FAIL_MMC_REQUEST
217 if (fail_request)
218 setup_fault_attr(&fail_default_attr, fail_request);
219 host->fail_mmc_request = fail_default_attr;
220 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
221 root,
222 &host->fail_mmc_request)))
223 goto err_node;
224#endif
225 return;
226
227err_node:
228 debugfs_remove_recursive(root);
229 host->debugfs_root = NULL;
230err_root:
231 dev_err(&host->class_dev, "failed to initialize debugfs\n");
232}
233
234void mmc_remove_host_debugfs(struct mmc_host *host)
235{
236 debugfs_remove_recursive(host->debugfs_root);
237}
238
239static int mmc_dbg_card_status_get(void *data, u64 *val)
240{
241 struct mmc_card *card = data;
242 u32 status;
243 int ret;
244
245 mmc_claim_host(card->host);
246
247 ret = mmc_send_status(data, &status);
248 if (!ret)
249 *val = status;
250
251 mmc_release_host(card->host);
252
253 return ret;
254}
255DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
256 NULL, "%08llx\n");
257
258#define EXT_CSD_STR_LEN 1025
259
260static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
261{
262 struct mmc_card *card = inode->i_private;
263 char *buf;
264 ssize_t n = 0;
265 u8 *ext_csd;
266 int err, i;
267
268 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
269 if (!buf)
270 return -ENOMEM;
271
272 ext_csd = kmalloc(512, GFP_KERNEL);
273 if (!ext_csd) {
274 err = -ENOMEM;
275 goto out_free;
276 }
277
278 mmc_claim_host(card->host);
279 err = mmc_send_ext_csd(card, ext_csd);
280 mmc_release_host(card->host);
281 if (err)
282 goto out_free;
283
284 for (i = 511; i >= 0; i--)
285 n += sprintf(buf + n, "%02x", ext_csd[i]);
286 n += sprintf(buf + n, "\n");
287 BUG_ON(n != EXT_CSD_STR_LEN);
288
289 filp->private_data = buf;
290 kfree(ext_csd);
291 return 0;
292
293out_free:
294 kfree(buf);
295 kfree(ext_csd);
296 return err;
297}
298
299static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
300 size_t cnt, loff_t *ppos)
301{
302 char *buf = filp->private_data;
303
304 return simple_read_from_buffer(ubuf, cnt, ppos,
305 buf, EXT_CSD_STR_LEN);
306}
307
308static int mmc_ext_csd_release(struct inode *inode, struct file *file)
309{
310 kfree(file->private_data);
311 return 0;
312}
313
314static const struct file_operations mmc_dbg_ext_csd_fops = {
315 .open = mmc_ext_csd_open,
316 .read = mmc_ext_csd_read,
317 .release = mmc_ext_csd_release,
318 .llseek = default_llseek,
319};
320
321void mmc_add_card_debugfs(struct mmc_card *card)
322{
323 struct mmc_host *host = card->host;
324 struct dentry *root;
325
326 if (!host->debugfs_root)
327 return;
328
329 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
330 if (IS_ERR(root))
331 /* Don't complain -- debugfs just isn't enabled */
332 return;
333 if (!root)
334 /* Complain -- debugfs is enabled, but it failed to
335 * create the directory. */
336 goto err;
337
338 card->debugfs_root = root;
339
340 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
341 goto err;
342
343 if (mmc_card_mmc(card) || mmc_card_sd(card))
344 if (!debugfs_create_file("status", S_IRUSR, root, card,
345 &mmc_dbg_card_status_fops))
346 goto err;
347
348 if (mmc_card_mmc(card))
349 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
350 &mmc_dbg_ext_csd_fops))
351 goto err;
352
353 return;
354
355err:
356 debugfs_remove_recursive(root);
357 card->debugfs_root = NULL;
358 dev_err(&card->dev, "failed to initialize debugfs\n");
359}
360
361void mmc_remove_card_debugfs(struct mmc_card *card)
362{
363 debugfs_remove_recursive(card->debugfs_root);
364}