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