1 /* 2 * Debugfs support for hosts and cards 3 * 4 * Copyright (C) 2008 Atmel Corporation 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #include <linux/debugfs.h> 11 #include <linux/fs.h> 12 #include <linux/seq_file.h> 13 #include <linux/slab.h> 14 #include <linux/stat.h> 15 16 #include <linux/mmc/card.h> 17 #include <linux/mmc/host.h> 18 19 #include "core.h" 20 #include "mmc_ops.h" 21 22 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */ 23 static int mmc_ios_show(struct seq_file *s, void *data) 24 { 25 static const char *vdd_str[] = { 26 [8] = "2.0", 27 [9] = "2.1", 28 [10] = "2.2", 29 [11] = "2.3", 30 [12] = "2.4", 31 [13] = "2.5", 32 [14] = "2.6", 33 [15] = "2.7", 34 [16] = "2.8", 35 [17] = "2.9", 36 [18] = "3.0", 37 [19] = "3.1", 38 [20] = "3.2", 39 [21] = "3.3", 40 [22] = "3.4", 41 [23] = "3.5", 42 [24] = "3.6", 43 }; 44 struct mmc_host *host = s->private; 45 struct mmc_ios *ios = &host->ios; 46 const char *str; 47 48 seq_printf(s, "clock:\t\t%u Hz\n", ios->clock); 49 seq_printf(s, "vdd:\t\t%u ", ios->vdd); 50 if ((1 << ios->vdd) & MMC_VDD_165_195) 51 seq_printf(s, "(1.65 - 1.95 V)\n"); 52 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1) 53 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1]) 54 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd], 55 vdd_str[ios->vdd + 1]); 56 else 57 seq_printf(s, "(invalid)\n"); 58 59 switch (ios->bus_mode) { 60 case MMC_BUSMODE_OPENDRAIN: 61 str = "open drain"; 62 break; 63 case MMC_BUSMODE_PUSHPULL: 64 str = "push-pull"; 65 break; 66 default: 67 str = "invalid"; 68 break; 69 } 70 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str); 71 72 switch (ios->chip_select) { 73 case MMC_CS_DONTCARE: 74 str = "don't care"; 75 break; 76 case MMC_CS_HIGH: 77 str = "active high"; 78 break; 79 case MMC_CS_LOW: 80 str = "active low"; 81 break; 82 default: 83 str = "invalid"; 84 break; 85 } 86 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str); 87 88 switch (ios->power_mode) { 89 case MMC_POWER_OFF: 90 str = "off"; 91 break; 92 case MMC_POWER_UP: 93 str = "up"; 94 break; 95 case MMC_POWER_ON: 96 str = "on"; 97 break; 98 default: 99 str = "invalid"; 100 break; 101 } 102 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str); 103 seq_printf(s, "bus width:\t%u (%u bits)\n", 104 ios->bus_width, 1 << ios->bus_width); 105 106 switch (ios->timing) { 107 case MMC_TIMING_LEGACY: 108 str = "legacy"; 109 break; 110 case MMC_TIMING_MMC_HS: 111 str = "mmc high-speed"; 112 break; 113 case MMC_TIMING_SD_HS: 114 str = "sd high-speed"; 115 break; 116 default: 117 str = "invalid"; 118 break; 119 } 120 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str); 121 122 return 0; 123 } 124 125 static int mmc_ios_open(struct inode *inode, struct file *file) 126 { 127 return single_open(file, mmc_ios_show, inode->i_private); 128 } 129 130 static const struct file_operations mmc_ios_fops = { 131 .open = mmc_ios_open, 132 .read = seq_read, 133 .llseek = seq_lseek, 134 .release = single_release, 135 }; 136 137 void mmc_add_host_debugfs(struct mmc_host *host) 138 { 139 struct dentry *root; 140 141 root = debugfs_create_dir(mmc_hostname(host), NULL); 142 if (IS_ERR(root)) 143 /* Don't complain -- debugfs just isn't enabled */ 144 return; 145 if (!root) 146 /* Complain -- debugfs is enabled, but it failed to 147 * create the directory. */ 148 goto err_root; 149 150 host->debugfs_root = root; 151 152 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops)) 153 goto err_ios; 154 155 return; 156 157 err_ios: 158 debugfs_remove_recursive(root); 159 host->debugfs_root = NULL; 160 err_root: 161 dev_err(&host->class_dev, "failed to initialize debugfs\n"); 162 } 163 164 void mmc_remove_host_debugfs(struct mmc_host *host) 165 { 166 debugfs_remove_recursive(host->debugfs_root); 167 } 168 169 static int mmc_dbg_card_status_get(void *data, u64 *val) 170 { 171 struct mmc_card *card = data; 172 u32 status; 173 int ret; 174 175 mmc_claim_host(card->host); 176 177 ret = mmc_send_status(data, &status); 178 if (!ret) 179 *val = status; 180 181 mmc_release_host(card->host); 182 183 return ret; 184 } 185 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get, 186 NULL, "%08llx\n"); 187 188 #define EXT_CSD_STR_LEN 1025 189 190 static int mmc_ext_csd_open(struct inode *inode, struct file *filp) 191 { 192 struct mmc_card *card = inode->i_private; 193 char *buf; 194 ssize_t n = 0; 195 u8 *ext_csd; 196 int err, i; 197 198 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL); 199 if (!buf) 200 return -ENOMEM; 201 202 ext_csd = kmalloc(512, GFP_KERNEL); 203 if (!ext_csd) { 204 err = -ENOMEM; 205 goto out_free; 206 } 207 208 mmc_claim_host(card->host); 209 err = mmc_send_ext_csd(card, ext_csd); 210 mmc_release_host(card->host); 211 if (err) 212 goto out_free; 213 214 for (i = 511; i >= 0; i--) 215 n += sprintf(buf + n, "%02x", ext_csd[i]); 216 n += sprintf(buf + n, "\n"); 217 BUG_ON(n != EXT_CSD_STR_LEN); 218 219 filp->private_data = buf; 220 kfree(ext_csd); 221 return 0; 222 223 out_free: 224 kfree(buf); 225 kfree(ext_csd); 226 return err; 227 } 228 229 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf, 230 size_t cnt, loff_t *ppos) 231 { 232 char *buf = filp->private_data; 233 234 return simple_read_from_buffer(ubuf, cnt, ppos, 235 buf, EXT_CSD_STR_LEN); 236 } 237 238 static int mmc_ext_csd_release(struct inode *inode, struct file *file) 239 { 240 kfree(file->private_data); 241 return 0; 242 } 243 244 static const struct file_operations mmc_dbg_ext_csd_fops = { 245 .open = mmc_ext_csd_open, 246 .read = mmc_ext_csd_read, 247 .release = mmc_ext_csd_release, 248 }; 249 250 void mmc_add_card_debugfs(struct mmc_card *card) 251 { 252 struct mmc_host *host = card->host; 253 struct dentry *root; 254 255 if (!host->debugfs_root) 256 return; 257 258 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root); 259 if (IS_ERR(root)) 260 /* Don't complain -- debugfs just isn't enabled */ 261 return; 262 if (!root) 263 /* Complain -- debugfs is enabled, but it failed to 264 * create the directory. */ 265 goto err; 266 267 card->debugfs_root = root; 268 269 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state)) 270 goto err; 271 272 if (mmc_card_mmc(card) || mmc_card_sd(card)) 273 if (!debugfs_create_file("status", S_IRUSR, root, card, 274 &mmc_dbg_card_status_fops)) 275 goto err; 276 277 if (mmc_card_mmc(card)) 278 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card, 279 &mmc_dbg_ext_csd_fops)) 280 goto err; 281 282 return; 283 284 err: 285 debugfs_remove_recursive(root); 286 card->debugfs_root = NULL; 287 dev_err(&card->dev, "failed to initialize debugfs\n"); 288 } 289 290 void mmc_remove_card_debugfs(struct mmc_card *card) 291 { 292 debugfs_remove_recursive(card->debugfs_root); 293 } 294