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/debugfs.h>
  11 #include <linux/fs.h>
  12 #include <linux/seq_file.h>
  13 #include <linux/slab.h>
  14 #include <linux/stat.h>
  15 #include <linux/fault-inject.h>
  16
  17 #include <linux/mmc/card.h>
  18 #include <linux/mmc/host.h>
  19
  20 #include "core.h"
  21 #include "mmc_ops.h"
  22
  23 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
  24 static int mmc_ios_show(struct seq_file *s, void *data)
  25 {
  26         static const char *vdd_str[] = {
  27                 [8]     = "2.0",
  28                 [9]     = "2.1",
  29                 [10]    = "2.2",
  30                 [11]    = "2.3",
  31                 [12]    = "2.4",
  32                 [13]    = "2.5",
  33                 [14]    = "2.6",
  34                 [15]    = "2.7",
  35                 [16]    = "2.8",
  36                 [17]    = "2.9",
  37                 [18]    = "3.0",
  38                 [19]    = "3.1",
  39                 [20]    = "3.2",
  40                 [21]    = "3.3",
  41                 [22]    = "3.4",
  42                 [23]    = "3.5",
  43                 [24]    = "3.6",
  44         };
  45         struct mmc_host *host = s->private;
  46         struct mmc_ios  *ios = &host->ios;
  47         const char *str;
  48
  49         seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
  50         seq_printf(s, "vdd:\t\t%u ", ios->vdd);
  51         if ((1 << ios->vdd) & MMC_VDD_165_195)
  52                 seq_printf(s, "(1.65 - 1.95 V)\n");
  53         else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
  54                         && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
  55                 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
  56                                 vdd_str[ios->vdd + 1]);
  57         else
  58                 seq_printf(s, "(invalid)\n");
  59
  60         switch (ios->bus_mode) {
  61         case MMC_BUSMODE_OPENDRAIN:
  62                 str = "open drain";
  63                 break;
  64         case MMC_BUSMODE_PUSHPULL:
  65                 str = "push-pull";
  66                 break;
  67         default:
  68                 str = "invalid";
  69                 break;
  70         }
  71         seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
  72
  73         switch (ios->chip_select) {
  74         case MMC_CS_DONTCARE:
  75                 str = "don't care";
  76                 break;
  77         case MMC_CS_HIGH:
  78                 str = "active high";
  79                 break;
  80         case MMC_CS_LOW:
  81                 str = "active low";
  82                 break;
  83         default:
  84                 str = "invalid";
  85                 break;
  86         }
  87         seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
  88
  89         switch (ios->power_mode) {
  90         case MMC_POWER_OFF:
  91                 str = "off";
  92                 break;
  93         case MMC_POWER_UP:
  94                 str = "up";
  95                 break;
  96         case MMC_POWER_ON:
  97                 str = "on";
  98                 break;
  99         default:
 100                 str = "invalid";
 101                 break;
 102         }
 103         seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
 104         seq_printf(s, "bus width:\t%u (%u bits)\n",
 105                         ios->bus_width, 1 << ios->bus_width);
 106
 107         switch (ios->timing) {
 108         case MMC_TIMING_LEGACY:
 109                 str = "legacy";
 110                 break;
 111         case MMC_TIMING_MMC_HS:
 112                 str = "mmc high-speed";
 113                 break;
 114         case MMC_TIMING_SD_HS:
 115                 str = "sd high-speed";
 116                 break;
 117         case MMC_TIMING_UHS_SDR50:
 118                 str = "sd uhs SDR50";
 119                 break;
 120         case MMC_TIMING_UHS_SDR104:
 121                 str = "sd uhs SDR104";
 122                 break;
 123         case MMC_TIMING_UHS_DDR50:
 124                 str = "sd uhs DDR50";
 125                 break;
 126         default:
 127                 str = "invalid";
 128                 break;
 129         }
 130         seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
 131
 132         return 0;
 133 }
 134
 135 static int mmc_ios_open(struct inode *inode, struct file *file)
 136 {
 137         return single_open(file, mmc_ios_show, inode->i_private);
 138 }
 139
 140 static const struct file_operations mmc_ios_fops = {
 141         .open           = mmc_ios_open,
 142         .read           = seq_read,
 143         .llseek         = seq_lseek,
 144         .release        = single_release,
 145 };
 146
 147 static int mmc_clock_opt_get(void *data, u64 *val)
 148 {
 149         struct mmc_host *host = data;
 150
 151         *val = host->ios.clock;
 152
 153         return 0;
 154 }
 155
 156 static int mmc_clock_opt_set(void *data, u64 val)
 157 {
 158         struct mmc_host *host = data;
 159
 160         /* We need this check due to input value is u64 */
 161         if (val > host->f_max)
 162                 return -EINVAL;
 163
 164         mmc_claim_host(host);
 165         mmc_set_clock(host, (unsigned int) val);
 166         mmc_release_host(host);
 167
 168         return 0;
 169 }
 170
 171 #ifdef CONFIG_FAIL_MMC_REQUEST
 172
 173 static DECLARE_FAULT_ATTR(fail_mmc_request);
 174
 175 #ifdef KERNEL
 176 /*
 177  * Internal function. Pass the boot param fail_mmc_request to
 178  * the setup fault injection attributes routine.
 179  */
 180 static int __init setup_fail_mmc_request(char *str)
 181 {
 182         return setup_fault_attr(&fail_mmc_request, str);
 183 }
 184 __setup("fail_mmc_request=", setup_fail_mmc_request);
 185 #endif /* KERNEL */
 186 #endif /* CONFIG_FAIL_MMC_REQUEST */
 187
 188 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
 189         "%llu\n");
 190
 191 void mmc_add_host_debugfs(struct mmc_host *host)
 192 {
 193         struct dentry *root;
 194
 195         root = debugfs_create_dir(mmc_hostname(host), NULL);
 196         if (IS_ERR(root))
 197                 /* Don't complain -- debugfs just isn't enabled */
 198                 return;
 199         if (!root)
 200                 /* Complain -- debugfs is enabled, but it failed to
 201                  * create the directory. */
 202                 goto err_root;
 203
 204         host->debugfs_root = root;
 205
 206         if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
 207                 goto err_node;
 208
 209         if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
 210                         &mmc_clock_fops))
 211                 goto err_node;
 212
 213 #ifdef CONFIG_MMC_CLKGATE
 214         if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
 215                                 root, &host->clk_delay))
 216                 goto err_node;
 217 #endif
 218 #ifdef CONFIG_FAIL_MMC_REQUEST
 219         host->fail_mmc_request = fail_mmc_request;
 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
 234 void mmc_remove_host_debugfs(struct mmc_host *host)
 235 {
 236         debugfs_remove_recursive(host->debugfs_root);
 237 }
 238
 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
 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
 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
 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
 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
 361 void mmc_remove_card_debugfs(struct mmc_card *card)
 362 {
 363         debugfs_remove_recursive(card->debugfs_root);
 364 }