drivers/mmc/core/debugfs.c

   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 }