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 return 0; 148 } 149 150 static int mmc_ios_open(struct inode *inode, struct file *file) 151 { 152 return single_open(file, mmc_ios_show, inode->i_private); 153 } 154 155 static const struct file_operations mmc_ios_fops = { 156 .open = mmc_ios_open, 157 .read = seq_read, 158 .llseek = seq_lseek, 159 .release = single_release, 160 }; 161 162 static int mmc_clock_opt_get(void *data, u64 *val) 163 { 164 struct mmc_host *host = data; 165 166 *val = host->ios.clock; 167 168 return 0; 169 } 170 171 static int mmc_clock_opt_set(void *data, u64 val) 172 { 173 struct mmc_host *host = data; 174 175 /* We need this check due to input value is u64 */ 176 if (val > host->f_max) 177 return -EINVAL; 178 179 mmc_claim_host(host); 180 mmc_set_clock(host, (unsigned int) val); 181 mmc_release_host(host); 182 183 return 0; 184 } 185 186 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, 187 "%llu\n"); 188 189 void mmc_add_host_debugfs(struct mmc_host *host) 190 { 191 struct dentry *root; 192 193 root = debugfs_create_dir(mmc_hostname(host), NULL); 194 if (IS_ERR(root)) 195 /* Don't complain -- debugfs just isn't enabled */ 196 return; 197 if (!root) 198 /* Complain -- debugfs is enabled, but it failed to 199 * create the directory. */ 200 goto err_root; 201 202 host->debugfs_root = root; 203 204 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops)) 205 goto err_node; 206 207 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host, 208 &mmc_clock_fops)) 209 goto err_node; 210 211 #ifdef CONFIG_MMC_CLKGATE 212 if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR), 213 root, &host->clk_delay)) 214 goto err_node; 215 #endif 216 #ifdef CONFIG_FAIL_MMC_REQUEST 217 if (fail_request) 218 setup_fault_attr(&fail_default_attr, fail_request); 219 host->fail_mmc_request = fail_default_attr; 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 = 0; i < 512; 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 } 365