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 30 #endif /* CONFIG_FAIL_MMC_REQUEST */ 31 32 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */ 33 static int mmc_ios_show(struct seq_file *s, void *data) 34 { 35 static const char *vdd_str[] = { 36 [8] = "2.0", 37 [9] = "2.1", 38 [10] = "2.2", 39 [11] = "2.3", 40 [12] = "2.4", 41 [13] = "2.5", 42 [14] = "2.6", 43 [15] = "2.7", 44 [16] = "2.8", 45 [17] = "2.9", 46 [18] = "3.0", 47 [19] = "3.1", 48 [20] = "3.2", 49 [21] = "3.3", 50 [22] = "3.4", 51 [23] = "3.5", 52 [24] = "3.6", 53 }; 54 struct mmc_host *host = s->private; 55 struct mmc_ios *ios = &host->ios; 56 const char *str; 57 58 seq_printf(s, "clock:\t\t%u Hz\n", ios->clock); 59 if (host->actual_clock) 60 seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock); 61 seq_printf(s, "vdd:\t\t%u ", ios->vdd); 62 if ((1 << ios->vdd) & MMC_VDD_165_195) 63 seq_printf(s, "(1.65 - 1.95 V)\n"); 64 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1) 65 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1]) 66 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd], 67 vdd_str[ios->vdd + 1]); 68 else 69 seq_printf(s, "(invalid)\n"); 70 71 switch (ios->bus_mode) { 72 case MMC_BUSMODE_OPENDRAIN: 73 str = "open drain"; 74 break; 75 case MMC_BUSMODE_PUSHPULL: 76 str = "push-pull"; 77 break; 78 default: 79 str = "invalid"; 80 break; 81 } 82 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str); 83 84 switch (ios->chip_select) { 85 case MMC_CS_DONTCARE: 86 str = "don't care"; 87 break; 88 case MMC_CS_HIGH: 89 str = "active high"; 90 break; 91 case MMC_CS_LOW: 92 str = "active low"; 93 break; 94 default: 95 str = "invalid"; 96 break; 97 } 98 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str); 99 100 switch (ios->power_mode) { 101 case MMC_POWER_OFF: 102 str = "off"; 103 break; 104 case MMC_POWER_UP: 105 str = "up"; 106 break; 107 case MMC_POWER_ON: 108 str = "on"; 109 break; 110 default: 111 str = "invalid"; 112 break; 113 } 114 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str); 115 seq_printf(s, "bus width:\t%u (%u bits)\n", 116 ios->bus_width, 1 << ios->bus_width); 117 118 switch (ios->timing) { 119 case MMC_TIMING_LEGACY: 120 str = "legacy"; 121 break; 122 case MMC_TIMING_MMC_HS: 123 str = "mmc high-speed"; 124 break; 125 case MMC_TIMING_SD_HS: 126 str = "sd high-speed"; 127 break; 128 case MMC_TIMING_UHS_SDR12: 129 str = "sd uhs SDR12"; 130 break; 131 case MMC_TIMING_UHS_SDR25: 132 str = "sd uhs SDR25"; 133 break; 134 case MMC_TIMING_UHS_SDR50: 135 str = "sd uhs SDR50"; 136 break; 137 case MMC_TIMING_UHS_SDR104: 138 str = "sd uhs SDR104"; 139 break; 140 case MMC_TIMING_UHS_DDR50: 141 str = "sd uhs DDR50"; 142 break; 143 case MMC_TIMING_MMC_DDR52: 144 str = "mmc DDR52"; 145 break; 146 case MMC_TIMING_MMC_HS200: 147 str = "mmc HS200"; 148 break; 149 case MMC_TIMING_MMC_HS400: 150 str = mmc_card_hs400es(host->card) ? 151 "mmc HS400 enhanced strobe" : "mmc HS400"; 152 break; 153 default: 154 str = "invalid"; 155 break; 156 } 157 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str); 158 159 switch (ios->signal_voltage) { 160 case MMC_SIGNAL_VOLTAGE_330: 161 str = "3.30 V"; 162 break; 163 case MMC_SIGNAL_VOLTAGE_180: 164 str = "1.80 V"; 165 break; 166 case MMC_SIGNAL_VOLTAGE_120: 167 str = "1.20 V"; 168 break; 169 default: 170 str = "invalid"; 171 break; 172 } 173 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str); 174 175 switch (ios->drv_type) { 176 case MMC_SET_DRIVER_TYPE_A: 177 str = "driver type A"; 178 break; 179 case MMC_SET_DRIVER_TYPE_B: 180 str = "driver type B"; 181 break; 182 case MMC_SET_DRIVER_TYPE_C: 183 str = "driver type C"; 184 break; 185 case MMC_SET_DRIVER_TYPE_D: 186 str = "driver type D"; 187 break; 188 default: 189 str = "invalid"; 190 break; 191 } 192 seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str); 193 194 return 0; 195 } 196 DEFINE_SHOW_ATTRIBUTE(mmc_ios); 197 198 static int mmc_clock_opt_get(void *data, u64 *val) 199 { 200 struct mmc_host *host = data; 201 202 *val = host->ios.clock; 203 204 return 0; 205 } 206 207 static int mmc_clock_opt_set(void *data, u64 val) 208 { 209 struct mmc_host *host = data; 210 211 /* We need this check due to input value is u64 */ 212 if (val != 0 && (val > host->f_max || val < host->f_min)) 213 return -EINVAL; 214 215 mmc_claim_host(host); 216 mmc_set_clock(host, (unsigned int) val); 217 mmc_release_host(host); 218 219 return 0; 220 } 221 222 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, 223 "%llu\n"); 224 225 void mmc_add_host_debugfs(struct mmc_host *host) 226 { 227 struct dentry *root; 228 229 root = debugfs_create_dir(mmc_hostname(host), NULL); 230 host->debugfs_root = root; 231 232 debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops); 233 debugfs_create_x32("caps", S_IRUSR, root, &host->caps); 234 debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2); 235 debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host, 236 &mmc_clock_fops); 237 238 #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 fault_create_debugfs_attr("fail_mmc_request", root, 243 &host->fail_mmc_request); 244 #endif 245 } 246 247 void mmc_remove_host_debugfs(struct mmc_host *host) 248 { 249 debugfs_remove_recursive(host->debugfs_root); 250 } 251 252 void mmc_add_card_debugfs(struct mmc_card *card) 253 { 254 struct mmc_host *host = card->host; 255 struct dentry *root; 256 257 if (!host->debugfs_root) 258 return; 259 260 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root); 261 card->debugfs_root = root; 262 263 debugfs_create_x32("state", S_IRUSR, root, &card->state); 264 } 265 266 void mmc_remove_card_debugfs(struct mmc_card *card) 267 { 268 debugfs_remove_recursive(card->debugfs_root); 269 card->debugfs_root = NULL; 270 } 271