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