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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
32
33
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 switch (ios->signal_voltage) {
148 case MMC_SIGNAL_VOLTAGE_330:
149 str = "3.30 V";
150 break;
151 case MMC_SIGNAL_VOLTAGE_180:
152 str = "1.80 V";
153 break;
154 case MMC_SIGNAL_VOLTAGE_120:
155 str = "1.20 V";
156 break;
157 default:
158 str = "invalid";
159 break;
160 }
161 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->chip_select, str);
162
163 return 0;
164}
165
166static int mmc_ios_open(struct inode *inode, struct file *file)
167{
168 return single_open(file, mmc_ios_show, inode->i_private);
169}
170
171static const struct file_operations mmc_ios_fops = {
172 .open = mmc_ios_open,
173 .read = seq_read,
174 .llseek = seq_lseek,
175 .release = single_release,
176};
177
178static int mmc_clock_opt_get(void *data, u64 *val)
179{
180 struct mmc_host *host = data;
181
182 *val = host->ios.clock;
183
184 return 0;
185}
186
187static int mmc_clock_opt_set(void *data, u64 val)
188{
189 struct mmc_host *host = data;
190
191
192 if (val > host->f_max)
193 return -EINVAL;
194
195 mmc_claim_host(host);
196 mmc_set_clock(host, (unsigned int) val);
197 mmc_release_host(host);
198
199 return 0;
200}
201
202DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
203 "%llu\n");
204
205void mmc_add_host_debugfs(struct mmc_host *host)
206{
207 struct dentry *root;
208
209 root = debugfs_create_dir(mmc_hostname(host), NULL);
210 if (IS_ERR(root))
211
212 return;
213 if (!root)
214
215
216 goto err_root;
217
218 host->debugfs_root = root;
219
220 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
221 goto err_node;
222
223 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
224 &mmc_clock_fops))
225 goto err_node;
226
227#ifdef CONFIG_MMC_CLKGATE
228 if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
229 root, &host->clk_delay))
230 goto err_node;
231#endif
232#ifdef CONFIG_FAIL_MMC_REQUEST
233 if (fail_request)
234 setup_fault_attr(&fail_default_attr, fail_request);
235 host->fail_mmc_request = fail_default_attr;
236 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
237 root,
238 &host->fail_mmc_request)))
239 goto err_node;
240#endif
241 return;
242
243err_node:
244 debugfs_remove_recursive(root);
245 host->debugfs_root = NULL;
246err_root:
247 dev_err(&host->class_dev, "failed to initialize debugfs\n");
248}
249
250void mmc_remove_host_debugfs(struct mmc_host *host)
251{
252 debugfs_remove_recursive(host->debugfs_root);
253}
254
255static int mmc_dbg_card_status_get(void *data, u64 *val)
256{
257 struct mmc_card *card = data;
258 u32 status;
259 int ret;
260
261 mmc_claim_host(card->host);
262
263 ret = mmc_send_status(data, &status);
264 if (!ret)
265 *val = status;
266
267 mmc_release_host(card->host);
268
269 return ret;
270}
271DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
272 NULL, "%08llx\n");
273
274#define EXT_CSD_STR_LEN 1025
275
276static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
277{
278 struct mmc_card *card = inode->i_private;
279 char *buf;
280 ssize_t n = 0;
281 u8 *ext_csd;
282 int err, i;
283
284 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
285 if (!buf)
286 return -ENOMEM;
287
288 ext_csd = kmalloc(512, GFP_KERNEL);
289 if (!ext_csd) {
290 err = -ENOMEM;
291 goto out_free;
292 }
293
294 mmc_claim_host(card->host);
295 err = mmc_send_ext_csd(card, ext_csd);
296 mmc_release_host(card->host);
297 if (err)
298 goto out_free;
299
300 for (i = 0; i < 512; i++)
301 n += sprintf(buf + n, "%02x", ext_csd[i]);
302 n += sprintf(buf + n, "\n");
303 BUG_ON(n != EXT_CSD_STR_LEN);
304
305 filp->private_data = buf;
306 kfree(ext_csd);
307 return 0;
308
309out_free:
310 kfree(buf);
311 kfree(ext_csd);
312 return err;
313}
314
315static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
316 size_t cnt, loff_t *ppos)
317{
318 char *buf = filp->private_data;
319
320 return simple_read_from_buffer(ubuf, cnt, ppos,
321 buf, EXT_CSD_STR_LEN);
322}
323
324static int mmc_ext_csd_release(struct inode *inode, struct file *file)
325{
326 kfree(file->private_data);
327 return 0;
328}
329
330static const struct file_operations mmc_dbg_ext_csd_fops = {
331 .open = mmc_ext_csd_open,
332 .read = mmc_ext_csd_read,
333 .release = mmc_ext_csd_release,
334 .llseek = default_llseek,
335};
336
337void mmc_add_card_debugfs(struct mmc_card *card)
338{
339 struct mmc_host *host = card->host;
340 struct dentry *root;
341
342 if (!host->debugfs_root)
343 return;
344
345 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
346 if (IS_ERR(root))
347
348 return;
349 if (!root)
350
351
352 goto err;
353
354 card->debugfs_root = root;
355
356 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
357 goto err;
358
359 if (mmc_card_mmc(card) || mmc_card_sd(card))
360 if (!debugfs_create_file("status", S_IRUSR, root, card,
361 &mmc_dbg_card_status_fops))
362 goto err;
363
364 if (mmc_card_mmc(card))
365 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
366 &mmc_dbg_ext_csd_fops))
367 goto err;
368
369 return;
370
371err:
372 debugfs_remove_recursive(root);
373 card->debugfs_root = NULL;
374 dev_err(&card->dev, "failed to initialize debugfs\n");
375}
376
377void mmc_remove_card_debugfs(struct mmc_card *card)
378{
379 debugfs_remove_recursive(card->debugfs_root);
380}
381
