drivers/mmc/core/debugfs.c

   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. */
  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
 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
 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
 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
 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
 277 void mmc_remove_host_debugfs(struct mmc_host *host)
 278 {
 279         debugfs_remove_recursive(host->debugfs_root);
 280 }
 281
 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
 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
 325         if (n != EXT_CSD_STR_LEN) {
 326                 err = -EINVAL;
 327                 goto out_free;
 328         }
 329
 330         filp->private_data = buf;
 331         kfree(ext_csd);
 332         return 0;
 333
 334 out_free:
 335         kfree(buf);
 336         return err;
 337 }
 338
 339 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
 340                                 size_t cnt, loff_t *ppos)
 341 {
 342         char *buf = filp->private_data;
 343
 344         return simple_read_from_buffer(ubuf, cnt, ppos,
 345                                        buf, EXT_CSD_STR_LEN);
 346 }
 347
 348 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
 349 {
 350         kfree(file->private_data);
 351         return 0;
 352 }
 353
 354 static const struct file_operations mmc_dbg_ext_csd_fops = {
 355         .open           = mmc_ext_csd_open,
 356         .read           = mmc_ext_csd_read,
 357         .release        = mmc_ext_csd_release,
 358         .llseek         = default_llseek,
 359 };
 360
 361 void mmc_add_card_debugfs(struct mmc_card *card)
 362 {
 363         struct mmc_host *host = card->host;
 364         struct dentry   *root;
 365
 366         if (!host->debugfs_root)
 367                 return;
 368
 369         root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
 370         if (IS_ERR(root))
 371                 /* Don't complain -- debugfs just isn't enabled */
 372                 return;
 373         if (!root)
 374                 /* Complain -- debugfs is enabled, but it failed to
 375                  * create the directory. */
 376                 goto err;
 377
 378         card->debugfs_root = root;
 379
 380         if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
 381                 goto err;
 382
 383         if (mmc_card_mmc(card) || mmc_card_sd(card))
 384                 if (!debugfs_create_file("status", S_IRUSR, root, card,
 385                                         &mmc_dbg_card_status_fops))
 386                         goto err;
 387
 388         if (mmc_card_mmc(card))
 389                 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
 390                                         &mmc_dbg_ext_csd_fops))
 391                         goto err;
 392
 393         return;
 394
 395 err:
 396         debugfs_remove_recursive(root);
 397         card->debugfs_root = NULL;
 398         dev_err(&card->dev, "failed to initialize debugfs\n");
 399 }
 400
 401 void mmc_remove_card_debugfs(struct mmc_card *card)
 402 {
 403         debugfs_remove_recursive(card->debugfs_root);
 404 }