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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 seq_printf(s, "vdd:\t\t%u ", ios->vdd);
61 if ((1 << ios->vdd) & MMC_VDD_165_195)
62 seq_printf(s, "(1.65 - 1.95 V)\n");
63 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
64 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
65 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
66 vdd_str[ios->vdd + 1]);
67 else
68 seq_printf(s, "(invalid)\n");
69
70 switch (ios->bus_mode) {
71 case MMC_BUSMODE_OPENDRAIN:
72 str = "open drain";
73 break;
74 case MMC_BUSMODE_PUSHPULL:
75 str = "push-pull";
76 break;
77 default:
78 str = "invalid";
79 break;
80 }
81 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
82
83 switch (ios->chip_select) {
84 case MMC_CS_DONTCARE:
85 str = "don't care";
86 break;
87 case MMC_CS_HIGH:
88 str = "active high";
89 break;
90 case MMC_CS_LOW:
91 str = "active low";
92 break;
93 default:
94 str = "invalid";
95 break;
96 }
97 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
98
99 switch (ios->power_mode) {
100 case MMC_POWER_OFF:
101 str = "off";
102 break;
103 case MMC_POWER_UP:
104 str = "up";
105 break;
106 case MMC_POWER_ON:
107 str = "on";
108 break;
109 default:
110 str = "invalid";
111 break;
112 }
113 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
114 seq_printf(s, "bus width:\t%u (%u bits)\n",
115 ios->bus_width, 1 << ios->bus_width);
116
117 switch (ios->timing) {
118 case MMC_TIMING_LEGACY:
119 str = "legacy";
120 break;
121 case MMC_TIMING_MMC_HS:
122 str = "mmc high-speed";
123 break;
124 case MMC_TIMING_SD_HS:
125 str = "sd high-speed";
126 break;
127 case MMC_TIMING_UHS_SDR50:
128 str = "sd uhs SDR50";
129 break;
130 case MMC_TIMING_UHS_SDR104:
131 str = "sd uhs SDR104";
132 break;
133 case MMC_TIMING_UHS_DDR50:
134 str = "sd uhs DDR50";
135 break;
136 default:
137 str = "invalid";
138 break;
139 }
140 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
141
142 return 0;
143}
144
145static int mmc_ios_open(struct inode *inode, struct file *file)
146{
147 return single_open(file, mmc_ios_show, inode->i_private);
148}
149
150static const struct file_operations mmc_ios_fops = {
151 .open = mmc_ios_open,
152 .read = seq_read,
153 .llseek = seq_lseek,
154 .release = single_release,
155};
156
157static int mmc_clock_opt_get(void *data, u64 *val)
158{
159 struct mmc_host *host = data;
160
161 *val = host->ios.clock;
162
163 return 0;
164}
165
166static int mmc_clock_opt_set(void *data, u64 val)
167{
168 struct mmc_host *host = data;
169
170
171 if (val > host->f_max)
172 return -EINVAL;
173
174 mmc_claim_host(host);
175 mmc_set_clock(host, (unsigned int) val);
176 mmc_release_host(host);
177
178 return 0;
179}
180
181DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
182 "%llu\n");
183
184void mmc_add_host_debugfs(struct mmc_host *host)
185{
186 struct dentry *root;
187
188 root = debugfs_create_dir(mmc_hostname(host), NULL);
189 if (IS_ERR(root))
190
191 return;
192 if (!root)
193
194
195 goto err_root;
196
197 host->debugfs_root = root;
198
199 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
200 goto err_node;
201
202 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
203 &mmc_clock_fops))
204 goto err_node;
205
206#ifdef CONFIG_MMC_CLKGATE
207 if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
208 root, &host->clk_delay))
209 goto err_node;
210#endif
211#ifdef CONFIG_FAIL_MMC_REQUEST
212 if (fail_request)
213 setup_fault_attr(&fail_default_attr, fail_request);
214 host->fail_mmc_request = fail_default_attr;
215 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
216 root,
217 &host->fail_mmc_request)))
218 goto err_node;
219#endif
220 return;
221
222err_node:
223 debugfs_remove_recursive(root);
224 host->debugfs_root = NULL;
225err_root:
226 dev_err(&host->class_dev, "failed to initialize debugfs\n");
227}
228
229void mmc_remove_host_debugfs(struct mmc_host *host)
230{
231 debugfs_remove_recursive(host->debugfs_root);
232}
233
234static int mmc_dbg_card_status_get(void *data, u64 *val)
235{
236 struct mmc_card *card = data;
237 u32 status;
238 int ret;
239
240 mmc_claim_host(card->host);
241
242 ret = mmc_send_status(data, &status);
243 if (!ret)
244 *val = status;
245
246 mmc_release_host(card->host);
247
248 return ret;
249}
250DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
251 NULL, "%08llx\n");
252
253#define EXT_CSD_STR_LEN 1025
254
255static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
256{
257 struct mmc_card *card = inode->i_private;
258 char *buf;
259 ssize_t n = 0;
260 u8 *ext_csd;
261 int err, i;
262
263 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
264 if (!buf)
265 return -ENOMEM;
266
267 ext_csd = kmalloc(512, GFP_KERNEL);
268 if (!ext_csd) {
269 err = -ENOMEM;
270 goto out_free;
271 }
272
273 mmc_claim_host(card->host);
274 err = mmc_send_ext_csd(card, ext_csd);
275 mmc_release_host(card->host);
276 if (err)
277 goto out_free;
278
279 for (i = 511; i >= 0; i--)
280 n += sprintf(buf + n, "%02x", ext_csd[i]);
281 n += sprintf(buf + n, "\n");
282 BUG_ON(n != EXT_CSD_STR_LEN);
283
284 filp->private_data = buf;
285 kfree(ext_csd);
286 return 0;
287
288out_free:
289 kfree(buf);
290 kfree(ext_csd);
291 return err;
292}
293
294static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
295 size_t cnt, loff_t *ppos)
296{
297 char *buf = filp->private_data;
298
299 return simple_read_from_buffer(ubuf, cnt, ppos,
300 buf, EXT_CSD_STR_LEN);
301}
302
303static int mmc_ext_csd_release(struct inode *inode, struct file *file)
304{
305 kfree(file->private_data);
306 return 0;
307}
308
309static const struct file_operations mmc_dbg_ext_csd_fops = {
310 .open = mmc_ext_csd_open,
311 .read = mmc_ext_csd_read,
312 .release = mmc_ext_csd_release,
313 .llseek = default_llseek,
314};
315
316void mmc_add_card_debugfs(struct mmc_card *card)
317{
318 struct mmc_host *host = card->host;
319 struct dentry *root;
320
321 if (!host->debugfs_root)
322 return;
323
324 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
325 if (IS_ERR(root))
326
327 return;
328 if (!root)
329
330
331 goto err;
332
333 card->debugfs_root = root;
334
335 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
336 goto err;
337
338 if (mmc_card_mmc(card) || mmc_card_sd(card))
339 if (!debugfs_create_file("status", S_IRUSR, root, card,
340 &mmc_dbg_card_status_fops))
341 goto err;
342
343 if (mmc_card_mmc(card))
344 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
345 &mmc_dbg_ext_csd_fops))
346 goto err;
347
348 return;
349
350err:
351 debugfs_remove_recursive(root);
352 card->debugfs_root = NULL;
353 dev_err(&card->dev, "failed to initialize debugfs\n");
354}
355
356void mmc_remove_card_debugfs(struct mmc_card *card)
357{
358 debugfs_remove_recursive(card->debugfs_root);
359}
360
