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_HS200: 139 str = "mmc high-speed SDR200"; 140 break; 141 default: 142 str = "invalid"; 143 break; 144 } 145 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str); 146 147 switch (ios->signal_voltage) { 148 case MMC_SIGNAL_VOLTAGE_330: 149 str = "3.30 V"; 150 break; 151 case MMC_SIGNAL_VOLTAGE_180: 152 str = "1.80 V"; 153 break; 154 case MMC_SIGNAL_VOLTAGE_120: 155 str = "1.20 V"; 156 break; 157 default: 158 str = "invalid"; 159 break; 160 } 161 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->chip_select, str); 162 163 return 0; 164 } 165 166 static int mmc_ios_open(struct inode *inode, struct file *file) 167 { 168 return single_open(file, mmc_ios_show, inode->i_private); 169 } 170 171 static const struct file_operations mmc_ios_fops = { 172 .open = mmc_ios_open, 173 .read = seq_read, 174 .llseek = seq_lseek, 175 .release = single_release, 176 }; 177 178 static int mmc_clock_opt_get(void *data, u64 *val) 179 { 180 struct mmc_host *host = data; 181 182 *val = host->ios.clock; 183 184 return 0; 185 } 186 187 static int mmc_clock_opt_set(void *data, u64 val) 188 { 189 struct mmc_host *host = data; 190 191 /* We need this check due to input value is u64 */ 192 if (val > host->f_max) 193 return -EINVAL; 194 195 mmc_claim_host(host); 196 mmc_set_clock(host, (unsigned int) val); 197 mmc_release_host(host); 198 199 return 0; 200 } 201 202 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, 203 "%llu\n"); 204 205 void mmc_add_host_debugfs(struct mmc_host *host) 206 { 207 struct dentry *root; 208 209 root = debugfs_create_dir(mmc_hostname(host), NULL); 210 if (IS_ERR(root)) 211 /* Don't complain -- debugfs just isn't enabled */ 212 return; 213 if (!root) 214 /* Complain -- debugfs is enabled, but it failed to 215 * create the directory. */ 216 goto err_root; 217 218 host->debugfs_root = root; 219 220 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops)) 221 goto err_node; 222 223 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host, 224 &mmc_clock_fops)) 225 goto err_node; 226 227 #ifdef CONFIG_MMC_CLKGATE 228 if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR), 229 root, &host->clk_delay)) 230 goto err_node; 231 #endif 232 #ifdef CONFIG_FAIL_MMC_REQUEST 233 if (fail_request) 234 setup_fault_attr(&fail_default_attr, fail_request); 235 host->fail_mmc_request = fail_default_attr; 236 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request", 237 root, 238 &host->fail_mmc_request))) 239 goto err_node; 240 #endif 241 return; 242 243 err_node: 244 debugfs_remove_recursive(root); 245 host->debugfs_root = NULL; 246 err_root: 247 dev_err(&host->class_dev, "failed to initialize debugfs\n"); 248 } 249 250 void mmc_remove_host_debugfs(struct mmc_host *host) 251 { 252 debugfs_remove_recursive(host->debugfs_root); 253 } 254 255 static int mmc_dbg_card_status_get(void *data, u64 *val) 256 { 257 struct mmc_card *card = data; 258 u32 status; 259 int ret; 260 261 mmc_claim_host(card->host); 262 263 ret = mmc_send_status(data, &status); 264 if (!ret) 265 *val = status; 266 267 mmc_release_host(card->host); 268 269 return ret; 270 } 271 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get, 272 NULL, "%08llx\n"); 273 274 #define EXT_CSD_STR_LEN 1025 275 276 static int mmc_ext_csd_open(struct inode *inode, struct file *filp) 277 { 278 struct mmc_card *card = inode->i_private; 279 char *buf; 280 ssize_t n = 0; 281 u8 *ext_csd; 282 int err, i; 283 284 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL); 285 if (!buf) 286 return -ENOMEM; 287 288 ext_csd = kmalloc(512, GFP_KERNEL); 289 if (!ext_csd) { 290 err = -ENOMEM; 291 goto out_free; 292 } 293 294 mmc_claim_host(card->host); 295 err = mmc_send_ext_csd(card, ext_csd); 296 mmc_release_host(card->host); 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 kfree(ext_csd); 312 return err; 313 } 314 315 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf, 316 size_t cnt, loff_t *ppos) 317 { 318 char *buf = filp->private_data; 319 320 return simple_read_from_buffer(ubuf, cnt, ppos, 321 buf, EXT_CSD_STR_LEN); 322 } 323 324 static int mmc_ext_csd_release(struct inode *inode, struct file *file) 325 { 326 kfree(file->private_data); 327 return 0; 328 } 329 330 static const struct file_operations mmc_dbg_ext_csd_fops = { 331 .open = mmc_ext_csd_open, 332 .read = mmc_ext_csd_read, 333 .release = mmc_ext_csd_release, 334 .llseek = default_llseek, 335 }; 336 337 void mmc_add_card_debugfs(struct mmc_card *card) 338 { 339 struct mmc_host *host = card->host; 340 struct dentry *root; 341 342 if (!host->debugfs_root) 343 return; 344 345 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root); 346 if (IS_ERR(root)) 347 /* Don't complain -- debugfs just isn't enabled */ 348 return; 349 if (!root) 350 /* Complain -- debugfs is enabled, but it failed to 351 * create the directory. */ 352 goto err; 353 354 card->debugfs_root = root; 355 356 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state)) 357 goto err; 358 359 if (mmc_card_mmc(card) || mmc_card_sd(card)) 360 if (!debugfs_create_file("status", S_IRUSR, root, card, 361 &mmc_dbg_card_status_fops)) 362 goto err; 363 364 if (mmc_card_mmc(card)) 365 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card, 366 &mmc_dbg_ext_csd_fops)) 367 goto err; 368 369 return; 370 371 err: 372 debugfs_remove_recursive(root); 373 card->debugfs_root = NULL; 374 dev_err(&card->dev, "failed to initialize debugfs\n"); 375 } 376 377 void mmc_remove_card_debugfs(struct mmc_card *card) 378 { 379 debugfs_remove_recursive(card->debugfs_root); 380 } 381