1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Debugfs support for hosts and cards 4 * 5 * Copyright (C) 2008 Atmel Corporation 6 */ 7 #include <linux/moduleparam.h> 8 #include <linux/export.h> 9 #include <linux/debugfs.h> 10 #include <linux/fs.h> 11 #include <linux/seq_file.h> 12 #include <linux/slab.h> 13 #include <linux/stat.h> 14 #include <linux/fault-inject.h> 15 16 #include <linux/mmc/card.h> 17 #include <linux/mmc/host.h> 18 19 #include "core.h" 20 #include "card.h" 21 #include "host.h" 22 #include "mmc_ops.h" 23 24 #ifdef CONFIG_FAIL_MMC_REQUEST 25 26 static DECLARE_FAULT_ATTR(fail_default_attr); 27 static char *fail_request; 28 module_param(fail_request, charp, 0); 29 MODULE_PARM_DESC(fail_request, "default fault injection attributes"); 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 DEFINE_SHOW_ATTRIBUTE(mmc_ios); 198 199 static int mmc_clock_opt_get(void *data, u64 *val) 200 { 201 struct mmc_host *host = data; 202 203 *val = host->ios.clock; 204 205 return 0; 206 } 207 208 static int mmc_clock_opt_set(void *data, u64 val) 209 { 210 struct mmc_host *host = data; 211 212 /* We need this check due to input value is u64 */ 213 if (val != 0 && (val > host->f_max || val < host->f_min)) 214 return -EINVAL; 215 216 mmc_claim_host(host); 217 mmc_set_clock(host, (unsigned int) val); 218 mmc_release_host(host); 219 220 return 0; 221 } 222 223 DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, 224 "%llu\n"); 225 226 static int mmc_err_state_get(void *data, u64 *val) 227 { 228 struct mmc_host *host = data; 229 int i; 230 231 if (!host) 232 return -EINVAL; 233 234 *val = 0; 235 for (i = 0; i < MMC_ERR_MAX; i++) { 236 if (host->err_stats[i]) { 237 *val = 1; 238 break; 239 } 240 } 241 242 return 0; 243 } 244 245 DEFINE_DEBUGFS_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n"); 246 247 static int mmc_err_stats_show(struct seq_file *file, void *data) 248 { 249 struct mmc_host *host = file->private; 250 const char *desc[MMC_ERR_MAX] = { 251 [MMC_ERR_CMD_TIMEOUT] = "Command Timeout Occurred", 252 [MMC_ERR_CMD_CRC] = "Command CRC Errors Occurred", 253 [MMC_ERR_DAT_TIMEOUT] = "Data Timeout Occurred", 254 [MMC_ERR_DAT_CRC] = "Data CRC Errors Occurred", 255 [MMC_ERR_AUTO_CMD] = "Auto-Cmd Error Occurred", 256 [MMC_ERR_ADMA] = "ADMA Error Occurred", 257 [MMC_ERR_TUNING] = "Tuning Error Occurred", 258 [MMC_ERR_CMDQ_RED] = "CMDQ RED Errors", 259 [MMC_ERR_CMDQ_GCE] = "CMDQ GCE Errors", 260 [MMC_ERR_CMDQ_ICCE] = "CMDQ ICCE Errors", 261 [MMC_ERR_REQ_TIMEOUT] = "Request Timedout", 262 [MMC_ERR_CMDQ_REQ_TIMEOUT] = "CMDQ Request Timedout", 263 [MMC_ERR_ICE_CFG] = "ICE Config Errors", 264 [MMC_ERR_CTRL_TIMEOUT] = "Controller Timedout errors", 265 [MMC_ERR_UNEXPECTED_IRQ] = "Unexpected IRQ errors", 266 }; 267 int i; 268 269 for (i = 0; i < MMC_ERR_MAX; i++) { 270 if (desc[i]) 271 seq_printf(file, "# %s:\t %d\n", 272 desc[i], host->err_stats[i]); 273 } 274 275 return 0; 276 } 277 278 static int mmc_err_stats_open(struct inode *inode, struct file *file) 279 { 280 return single_open(file, mmc_err_stats_show, inode->i_private); 281 } 282 283 static ssize_t mmc_err_stats_write(struct file *filp, const char __user *ubuf, 284 size_t cnt, loff_t *ppos) 285 { 286 struct mmc_host *host = filp->f_mapping->host->i_private; 287 288 pr_debug("%s: Resetting MMC error statistics\n", __func__); 289 memset(host->err_stats, 0, sizeof(host->err_stats)); 290 291 return cnt; 292 } 293 294 static const struct file_operations mmc_err_stats_fops = { 295 .open = mmc_err_stats_open, 296 .read = seq_read, 297 .write = mmc_err_stats_write, 298 .release = single_release, 299 }; 300 301 void mmc_add_host_debugfs(struct mmc_host *host) 302 { 303 struct dentry *root; 304 305 root = debugfs_create_dir(mmc_hostname(host), NULL); 306 host->debugfs_root = root; 307 308 debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops); 309 debugfs_create_x32("caps", S_IRUSR, root, &host->caps); 310 debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2); 311 debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host, 312 &mmc_clock_fops); 313 314 debugfs_create_file_unsafe("err_state", 0600, root, host, 315 &mmc_err_state); 316 debugfs_create_file("err_stats", 0600, root, host, 317 &mmc_err_stats_fops); 318 319 #ifdef CONFIG_FAIL_MMC_REQUEST 320 if (fail_request) 321 setup_fault_attr(&fail_default_attr, fail_request); 322 host->fail_mmc_request = fail_default_attr; 323 fault_create_debugfs_attr("fail_mmc_request", root, 324 &host->fail_mmc_request); 325 #endif 326 } 327 328 void mmc_remove_host_debugfs(struct mmc_host *host) 329 { 330 debugfs_remove_recursive(host->debugfs_root); 331 } 332 333 void mmc_add_card_debugfs(struct mmc_card *card) 334 { 335 struct mmc_host *host = card->host; 336 struct dentry *root; 337 338 if (!host->debugfs_root) 339 return; 340 341 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root); 342 card->debugfs_root = root; 343 344 debugfs_create_x32("state", S_IRUSR, root, &card->state); 345 } 346 347 void mmc_remove_card_debugfs(struct mmc_card *card) 348 { 349 debugfs_remove_recursive(card->debugfs_root); 350 card->debugfs_root = NULL; 351 } 352