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 void mmc_add_host_debugfs(struct mmc_host *host) 227 { 228 struct dentry *root; 229 230 root = debugfs_create_dir(mmc_hostname(host), NULL); 231 host->debugfs_root = root; 232 233 debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops); 234 debugfs_create_x32("caps", S_IRUSR, root, &host->caps); 235 debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2); 236 debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host, 237 &mmc_clock_fops); 238 239 #ifdef CONFIG_FAIL_MMC_REQUEST 240 if (fail_request) 241 setup_fault_attr(&fail_default_attr, fail_request); 242 host->fail_mmc_request = fail_default_attr; 243 fault_create_debugfs_attr("fail_mmc_request", root, 244 &host->fail_mmc_request); 245 #endif 246 } 247 248 void mmc_remove_host_debugfs(struct mmc_host *host) 249 { 250 debugfs_remove_recursive(host->debugfs_root); 251 } 252 253 void mmc_add_card_debugfs(struct mmc_card *card) 254 { 255 struct mmc_host *host = card->host; 256 struct dentry *root; 257 258 if (!host->debugfs_root) 259 return; 260 261 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root); 262 card->debugfs_root = root; 263 264 debugfs_create_x32("state", S_IRUSR, root, &card->state); 265 } 266 267 void mmc_remove_card_debugfs(struct mmc_card *card) 268 { 269 debugfs_remove_recursive(card->debugfs_root); 270 card->debugfs_root = NULL; 271 } 272