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 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 }