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_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
mmc_ios_open(struct inode * inode,struct file * file)150 static int mmc_ios_open(struct inode *inode, struct file *file)
151 {
152 return single_open(file, mmc_ios_show, inode->i_private);
153 }
154
155 static 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
mmc_clock_opt_get(void * data,u64 * val)162 static 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
mmc_clock_opt_set(void * data,u64 val)171 static 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
186 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
187 "%llu\n");
188
mmc_add_host_debugfs(struct mmc_host * host)189 void 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
227 err_node:
228 debugfs_remove_recursive(root);
229 host->debugfs_root = NULL;
230 err_root:
231 dev_err(&host->class_dev, "failed to initialize debugfs\n");
232 }
233
mmc_remove_host_debugfs(struct mmc_host * host)234 void mmc_remove_host_debugfs(struct mmc_host *host)
235 {
236 debugfs_remove_recursive(host->debugfs_root);
237 }
238
mmc_dbg_card_status_get(void * data,u64 * val)239 static 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 }
255 DEFINE_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
mmc_ext_csd_open(struct inode * inode,struct file * filp)260 static 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
293 out_free:
294 kfree(buf);
295 kfree(ext_csd);
296 return err;
297 }
298
mmc_ext_csd_read(struct file * filp,char __user * ubuf,size_t cnt,loff_t * ppos)299 static 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
mmc_ext_csd_release(struct inode * inode,struct file * file)308 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
309 {
310 kfree(file->private_data);
311 return 0;
312 }
313
314 static 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
mmc_add_card_debugfs(struct mmc_card * card)321 void 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
355 err:
356 debugfs_remove_recursive(root);
357 card->debugfs_root = NULL;
358 dev_err(&card->dev, "failed to initialize debugfs\n");
359 }
360
mmc_remove_card_debugfs(struct mmc_card * card)361 void mmc_remove_card_debugfs(struct mmc_card *card)
362 {
363 debugfs_remove_recursive(card->debugfs_root);
364 }
365