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_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_DDR52: 139 str = "mmc DDR52"; 140 break; 141 case MMC_TIMING_MMC_HS200: 142 str = "mmc HS200"; 143 break; 144 case MMC_TIMING_MMC_HS400: 145 str = "mmc HS400"; 146 break; 147 default: 148 str = "invalid"; 149 break; 150 } 151 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str); 152 153 switch (ios->signal_voltage) { 154 case MMC_SIGNAL_VOLTAGE_330: 155 str = "3.30 V"; 156 break; 157 case MMC_SIGNAL_VOLTAGE_180: 158 str = "1.80 V"; 159 break; 160 case MMC_SIGNAL_VOLTAGE_120: 161 str = "1.20 V"; 162 break; 163 default: 164 str = "invalid"; 165 break; 166 } 167 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->chip_select, str); 168 169 return 0; 170 } 171 172 static int mmc_ios_open(struct inode *inode, struct file *file) 173 { 174 return single_open(file, mmc_ios_show, inode->i_private); 175 } 176 177 static const struct file_operations mmc_ios_fops = { 178 .open = mmc_ios_open, 179 .read = seq_read, 180 .llseek = seq_lseek, 181 .release = single_release, 182 }; 183 184 static int mmc_clock_opt_get(void *data, u64 *val) 185 { 186 struct mmc_host *host = data; 187 188 *val = host->ios.clock; 189 190 return 0; 191 } 192 193 static int mmc_clock_opt_set(void *data, u64 val) 194 { 195 struct mmc_host *host = data; 196 197 /* We need this check due to input value is u64 */ 198 if (val > host->f_max) 199 return -EINVAL; 200 201 mmc_claim_host(host); 202 mmc_set_clock(host, (unsigned int) val); 203 mmc_release_host(host); 204 205 return 0; 206 } 207 208 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, 209 "%llu\n"); 210 211 void mmc_add_host_debugfs(struct mmc_host *host) 212 { 213 struct dentry *root; 214 215 root = debugfs_create_dir(mmc_hostname(host), NULL); 216 if (IS_ERR(root)) 217 /* Don't complain -- debugfs just isn't enabled */ 218 return; 219 if (!root) 220 /* Complain -- debugfs is enabled, but it failed to 221 * create the directory. */ 222 goto err_root; 223 224 host->debugfs_root = root; 225 226 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops)) 227 goto err_node; 228 229 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host, 230 &mmc_clock_fops)) 231 goto err_node; 232 233 #ifdef CONFIG_MMC_CLKGATE 234 if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR), 235 root, &host->clk_delay)) 236 goto err_node; 237 #endif 238 #ifdef CONFIG_FAIL_MMC_REQUEST 239 if (fail_request) 240 setup_fault_attr(&fail_default_attr, fail_request); 241 host->fail_mmc_request = fail_default_attr; 242 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request", 243 root, 244 &host->fail_mmc_request))) 245 goto err_node; 246 #endif 247 return; 248 249 err_node: 250 debugfs_remove_recursive(root); 251 host->debugfs_root = NULL; 252 err_root: 253 dev_err(&host->class_dev, "failed to initialize debugfs\n"); 254 } 255 256 void mmc_remove_host_debugfs(struct mmc_host *host) 257 { 258 debugfs_remove_recursive(host->debugfs_root); 259 } 260 261 static int mmc_dbg_card_status_get(void *data, u64 *val) 262 { 263 struct mmc_card *card = data; 264 u32 status; 265 int ret; 266 267 mmc_get_card(card); 268 269 ret = mmc_send_status(data, &status); 270 if (!ret) 271 *val = status; 272 273 mmc_put_card(card); 274 275 return ret; 276 } 277 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get, 278 NULL, "%08llx\n"); 279 280 #define EXT_CSD_STR_LEN 1025 281 282 static int mmc_ext_csd_open(struct inode *inode, struct file *filp) 283 { 284 struct mmc_card *card = inode->i_private; 285 char *buf; 286 ssize_t n = 0; 287 u8 *ext_csd; 288 int err, i; 289 290 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL); 291 if (!buf) 292 return -ENOMEM; 293 294 mmc_get_card(card); 295 err = mmc_get_ext_csd(card, &ext_csd); 296 mmc_put_card(card); 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; 308 309 out_free: 310 kfree(buf); 311 return err; 312 } 313 314 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf, 315 size_t cnt, loff_t *ppos) 316 { 317 char *buf = filp->private_data; 318 319 return simple_read_from_buffer(ubuf, cnt, ppos, 320 buf, EXT_CSD_STR_LEN); 321 } 322 323 static int mmc_ext_csd_release(struct inode *inode, struct file *file) 324 { 325 kfree(file->private_data); 326 return 0; 327 } 328 329 static const struct file_operations mmc_dbg_ext_csd_fops = { 330 .open = mmc_ext_csd_open, 331 .read = mmc_ext_csd_read, 332 .release = mmc_ext_csd_release, 333 .llseek = default_llseek, 334 }; 335 336 void mmc_add_card_debugfs(struct mmc_card *card) 337 { 338 struct mmc_host *host = card->host; 339 struct dentry *root; 340 341 if (!host->debugfs_root) 342 return; 343 344 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root); 345 if (IS_ERR(root)) 346 /* Don't complain -- debugfs just isn't enabled */ 347 return; 348 if (!root) 349 /* Complain -- debugfs is enabled, but it failed to 350 * create the directory. */ 351 goto err; 352 353 card->debugfs_root = root; 354 355 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state)) 356 goto err; 357 358 if (mmc_card_mmc(card) || mmc_card_sd(card)) 359 if (!debugfs_create_file("status", S_IRUSR, root, card, 360 &mmc_dbg_card_status_fops)) 361 goto err; 362 363 if (mmc_card_mmc(card)) 364 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card, 365 &mmc_dbg_ext_csd_fops)) 366 goto err; 367 368 return; 369 370 err: 371 debugfs_remove_recursive(root); 372 card->debugfs_root = NULL; 373 dev_err(&card->dev, "failed to initialize debugfs\n"); 374 } 375 376 void mmc_remove_card_debugfs(struct mmc_card *card) 377 { 378 debugfs_remove_recursive(card->debugfs_root); 379 } 380