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
27 static DECLARE_FAULT_ATTR(fail_default_attr);
28 static char *fail_request;
29 module_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. */
mmc_ios_show(struct seq_file * s,void * data)34 static 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_card_hs400es(host->card) ?
152 "mmc HS400 enhanced strobe" : "mmc HS400";
153 break;
154 default:
155 str = "invalid";
156 break;
157 }
158 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
159
160 switch (ios->signal_voltage) {
161 case MMC_SIGNAL_VOLTAGE_330:
162 str = "3.30 V";
163 break;
164 case MMC_SIGNAL_VOLTAGE_180:
165 str = "1.80 V";
166 break;
167 case MMC_SIGNAL_VOLTAGE_120:
168 str = "1.20 V";
169 break;
170 default:
171 str = "invalid";
172 break;
173 }
174 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
175
176 switch (ios->drv_type) {
177 case MMC_SET_DRIVER_TYPE_A:
178 str = "driver type A";
179 break;
180 case MMC_SET_DRIVER_TYPE_B:
181 str = "driver type B";
182 break;
183 case MMC_SET_DRIVER_TYPE_C:
184 str = "driver type C";
185 break;
186 case MMC_SET_DRIVER_TYPE_D:
187 str = "driver type D";
188 break;
189 default:
190 str = "invalid";
191 break;
192 }
193 seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str);
194
195 return 0;
196 }
197
mmc_ios_open(struct inode * inode,struct file * file)198 static int mmc_ios_open(struct inode *inode, struct file *file)
199 {
200 return single_open(file, mmc_ios_show, inode->i_private);
201 }
202
203 static const struct file_operations mmc_ios_fops = {
204 .open = mmc_ios_open,
205 .read = seq_read,
206 .llseek = seq_lseek,
207 .release = single_release,
208 };
209
mmc_clock_opt_get(void * data,u64 * val)210 static int mmc_clock_opt_get(void *data, u64 *val)
211 {
212 struct mmc_host *host = data;
213
214 *val = host->ios.clock;
215
216 return 0;
217 }
218
mmc_clock_opt_set(void * data,u64 val)219 static int mmc_clock_opt_set(void *data, u64 val)
220 {
221 struct mmc_host *host = data;
222
223 /* We need this check due to input value is u64 */
224 if (val != 0 && (val > host->f_max || val < host->f_min))
225 return -EINVAL;
226
227 mmc_claim_host(host);
228 mmc_set_clock(host, (unsigned int) val);
229 mmc_release_host(host);
230
231 return 0;
232 }
233
234 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
235 "%llu\n");
236
mmc_add_host_debugfs(struct mmc_host * host)237 void mmc_add_host_debugfs(struct mmc_host *host)
238 {
239 struct dentry *root;
240
241 root = debugfs_create_dir(mmc_hostname(host), NULL);
242 if (IS_ERR(root))
243 /* Don't complain -- debugfs just isn't enabled */
244 return;
245 if (!root)
246 /* Complain -- debugfs is enabled, but it failed to
247 * create the directory. */
248 goto err_root;
249
250 host->debugfs_root = root;
251
252 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
253 goto err_node;
254
255 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
256 &mmc_clock_fops))
257 goto err_node;
258
259 #ifdef CONFIG_FAIL_MMC_REQUEST
260 if (fail_request)
261 setup_fault_attr(&fail_default_attr, fail_request);
262 host->fail_mmc_request = fail_default_attr;
263 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
264 root,
265 &host->fail_mmc_request)))
266 goto err_node;
267 #endif
268 return;
269
270 err_node:
271 debugfs_remove_recursive(root);
272 host->debugfs_root = NULL;
273 err_root:
274 dev_err(&host->class_dev, "failed to initialize debugfs\n");
275 }
276
mmc_remove_host_debugfs(struct mmc_host * host)277 void mmc_remove_host_debugfs(struct mmc_host *host)
278 {
279 debugfs_remove_recursive(host->debugfs_root);
280 }
281
mmc_dbg_card_status_get(void * data,u64 * val)282 static int mmc_dbg_card_status_get(void *data, u64 *val)
283 {
284 struct mmc_card *card = data;
285 u32 status;
286 int ret;
287
288 mmc_get_card(card);
289
290 ret = mmc_send_status(data, &status);
291 if (!ret)
292 *val = status;
293
294 mmc_put_card(card);
295
296 return ret;
297 }
298 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
299 NULL, "%08llx\n");
300
301 #define EXT_CSD_STR_LEN 1025
302
mmc_ext_csd_open(struct inode * inode,struct file * filp)303 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
304 {
305 struct mmc_card *card = inode->i_private;
306 char *buf;
307 ssize_t n = 0;
308 u8 *ext_csd;
309 int err, i;
310
311 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
312 if (!buf)
313 return -ENOMEM;
314
315 mmc_get_card(card);
316 err = mmc_get_ext_csd(card, &ext_csd);
317 mmc_put_card(card);
318 if (err)
319 goto out_free;
320
321 for (i = 0; i < 512; i++)
322 n += sprintf(buf + n, "%02x", ext_csd[i]);
323 n += sprintf(buf + n, "\n");
324 BUG_ON(n != EXT_CSD_STR_LEN);
325
326 filp->private_data = buf;
327 kfree(ext_csd);
328 return 0;
329
330 out_free:
331 kfree(buf);
332 return err;
333 }
334
mmc_ext_csd_read(struct file * filp,char __user * ubuf,size_t cnt,loff_t * ppos)335 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
336 size_t cnt, loff_t *ppos)
337 {
338 char *buf = filp->private_data;
339
340 return simple_read_from_buffer(ubuf, cnt, ppos,
341 buf, EXT_CSD_STR_LEN);
342 }
343
mmc_ext_csd_release(struct inode * inode,struct file * file)344 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
345 {
346 kfree(file->private_data);
347 return 0;
348 }
349
350 static const struct file_operations mmc_dbg_ext_csd_fops = {
351 .open = mmc_ext_csd_open,
352 .read = mmc_ext_csd_read,
353 .release = mmc_ext_csd_release,
354 .llseek = default_llseek,
355 };
356
mmc_add_card_debugfs(struct mmc_card * card)357 void mmc_add_card_debugfs(struct mmc_card *card)
358 {
359 struct mmc_host *host = card->host;
360 struct dentry *root;
361
362 if (!host->debugfs_root)
363 return;
364
365 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
366 if (IS_ERR(root))
367 /* Don't complain -- debugfs just isn't enabled */
368 return;
369 if (!root)
370 /* Complain -- debugfs is enabled, but it failed to
371 * create the directory. */
372 goto err;
373
374 card->debugfs_root = root;
375
376 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
377 goto err;
378
379 if (mmc_card_mmc(card) || mmc_card_sd(card))
380 if (!debugfs_create_file("status", S_IRUSR, root, card,
381 &mmc_dbg_card_status_fops))
382 goto err;
383
384 if (mmc_card_mmc(card))
385 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
386 &mmc_dbg_ext_csd_fops))
387 goto err;
388
389 return;
390
391 err:
392 debugfs_remove_recursive(root);
393 card->debugfs_root = NULL;
394 dev_err(&card->dev, "failed to initialize debugfs\n");
395 }
396
mmc_remove_card_debugfs(struct mmc_card * card)397 void mmc_remove_card_debugfs(struct mmc_card *card)
398 {
399 debugfs_remove_recursive(card->debugfs_root);
400 }
401