Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 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 | */ |
Stephen Rothwell | 3f102ae | 2011-10-09 10:35:16 -0400 | [diff] [blame] | 10 | #include <linux/moduleparam.h> |
Paul Gortmaker | 3ef77af | 2011-07-10 12:42:00 -0400 | [diff] [blame] | 11 | #include <linux/export.h> |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 12 | #include <linux/debugfs.h> |
| 13 | #include <linux/fs.h> |
| 14 | #include <linux/seq_file.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/slab.h> |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 16 | #include <linux/stat.h> |
Per Forlin | 1b676f7 | 2011-08-19 14:52:37 +0200 | [diff] [blame] | 17 | #include <linux/fault-inject.h> |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 18 | |
Haavard Skinnemoen | f4b7f92 | 2008-07-24 14:18:58 +0200 | [diff] [blame] | 19 | #include <linux/mmc/card.h> |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 20 | #include <linux/mmc/host.h> |
| 21 | |
| 22 | #include "core.h" |
Haavard Skinnemoen | f4b7f92 | 2008-07-24 14:18:58 +0200 | [diff] [blame] | 23 | #include "mmc_ops.h" |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 24 | |
Per Forlin | 34f5050 | 2011-09-13 23:03:29 +0200 | [diff] [blame] | 25 | #ifdef CONFIG_FAIL_MMC_REQUEST |
| 26 | |
| 27 | static DECLARE_FAULT_ATTR(fail_default_attr); |
| 28 | static char *fail_request; |
| 29 | module_param(fail_request, charp, 0); |
| 30 | |
| 31 | #endif /* CONFIG_FAIL_MMC_REQUEST */ |
| 32 | |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 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); |
Giuseppe CAVALLARO | df16219 | 2011-11-04 13:53:19 +0100 | [diff] [blame] | 60 | if (host->actual_clock) |
| 61 | seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock); |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 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; |
Aaron Lu | cd8a366 | 2011-09-02 16:06:08 +0800 | [diff] [blame] | 129 | case MMC_TIMING_UHS_SDR50: |
| 130 | str = "sd uhs SDR50"; |
| 131 | break; |
| 132 | case MMC_TIMING_UHS_SDR104: |
| 133 | str = "sd uhs SDR104"; |
| 134 | break; |
| 135 | case MMC_TIMING_UHS_DDR50: |
| 136 | str = "sd uhs DDR50"; |
| 137 | break; |
Seungwon Jeon | 79f7ae7 | 2014-03-14 21:11:56 +0900 | [diff] [blame] | 138 | case MMC_TIMING_MMC_DDR52: |
| 139 | str = "mmc DDR52"; |
| 140 | break; |
Girish K S | a4924c7 | 2012-01-11 14:04:52 -0500 | [diff] [blame] | 141 | case MMC_TIMING_MMC_HS200: |
Seungwon Jeon | 577fb13 | 2014-04-23 17:08:44 +0900 | [diff] [blame] | 142 | str = "mmc HS200"; |
Girish K S | a4924c7 | 2012-01-11 14:04:52 -0500 | [diff] [blame] | 143 | break; |
Seungwon Jeon | 0a5b643 | 2014-04-23 17:14:58 +0900 | [diff] [blame] | 144 | case MMC_TIMING_MMC_HS400: |
| 145 | str = "mmc HS400"; |
| 146 | break; |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 147 | default: |
| 148 | str = "invalid"; |
| 149 | break; |
| 150 | } |
| 151 | seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str); |
| 152 | |
Johan Rudholm | 42cd95a | 2012-10-26 11:31:55 +0200 | [diff] [blame] | 153 | switch (ios->signal_voltage) { |
| 154 | case MMC_SIGNAL_VOLTAGE_330: |
| 155 | str = "3.30 V"; |
| 156 | break; |
| 157 | case MMC_SIGNAL_VOLTAGE_180: |
| 158 | str = "1.80 V"; |
| 159 | break; |
| 160 | case MMC_SIGNAL_VOLTAGE_120: |
| 161 | str = "1.20 V"; |
| 162 | break; |
| 163 | default: |
| 164 | str = "invalid"; |
| 165 | break; |
| 166 | } |
| 167 | seq_printf(s, "signal voltage:\t%u (%s)\n", ios->chip_select, str); |
| 168 | |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 169 | return 0; |
| 170 | } |
| 171 | |
| 172 | static int mmc_ios_open(struct inode *inode, struct file *file) |
| 173 | { |
| 174 | return single_open(file, mmc_ios_show, inode->i_private); |
| 175 | } |
| 176 | |
| 177 | static const struct file_operations mmc_ios_fops = { |
| 178 | .open = mmc_ios_open, |
| 179 | .read = seq_read, |
| 180 | .llseek = seq_lseek, |
| 181 | .release = single_release, |
| 182 | }; |
| 183 | |
Andy Shevchenko | 703aae3 | 2010-10-13 11:22:22 +0300 | [diff] [blame] | 184 | static int mmc_clock_opt_get(void *data, u64 *val) |
| 185 | { |
| 186 | struct mmc_host *host = data; |
| 187 | |
| 188 | *val = host->ios.clock; |
| 189 | |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | static int mmc_clock_opt_set(void *data, u64 val) |
| 194 | { |
| 195 | struct mmc_host *host = data; |
| 196 | |
| 197 | /* We need this check due to input value is u64 */ |
| 198 | if (val > host->f_max) |
| 199 | return -EINVAL; |
| 200 | |
| 201 | mmc_claim_host(host); |
| 202 | mmc_set_clock(host, (unsigned int) val); |
| 203 | mmc_release_host(host); |
| 204 | |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set, |
| 209 | "%llu\n"); |
| 210 | |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 211 | void mmc_add_host_debugfs(struct mmc_host *host) |
| 212 | { |
| 213 | struct dentry *root; |
| 214 | |
| 215 | root = debugfs_create_dir(mmc_hostname(host), NULL); |
| 216 | if (IS_ERR(root)) |
| 217 | /* Don't complain -- debugfs just isn't enabled */ |
| 218 | return; |
| 219 | if (!root) |
| 220 | /* Complain -- debugfs is enabled, but it failed to |
| 221 | * create the directory. */ |
| 222 | goto err_root; |
| 223 | |
| 224 | host->debugfs_root = root; |
| 225 | |
| 226 | if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops)) |
Andy Shevchenko | 703aae3 | 2010-10-13 11:22:22 +0300 | [diff] [blame] | 227 | goto err_node; |
| 228 | |
| 229 | if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host, |
| 230 | &mmc_clock_fops)) |
| 231 | goto err_node; |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 232 | |
Linus Walleij | 0456683 | 2010-11-08 21:36:50 -0500 | [diff] [blame] | 233 | #ifdef CONFIG_MMC_CLKGATE |
| 234 | if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR), |
| 235 | root, &host->clk_delay)) |
| 236 | goto err_node; |
| 237 | #endif |
Per Forlin | 1b676f7 | 2011-08-19 14:52:37 +0200 | [diff] [blame] | 238 | #ifdef CONFIG_FAIL_MMC_REQUEST |
Per Forlin | 34f5050 | 2011-09-13 23:03:29 +0200 | [diff] [blame] | 239 | if (fail_request) |
| 240 | setup_fault_attr(&fail_default_attr, fail_request); |
| 241 | host->fail_mmc_request = fail_default_attr; |
Per Forlin | 1b676f7 | 2011-08-19 14:52:37 +0200 | [diff] [blame] | 242 | if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request", |
| 243 | root, |
| 244 | &host->fail_mmc_request))) |
| 245 | goto err_node; |
| 246 | #endif |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 247 | return; |
| 248 | |
Andy Shevchenko | 703aae3 | 2010-10-13 11:22:22 +0300 | [diff] [blame] | 249 | err_node: |
Haavard Skinnemoen | 6edd8ee | 2008-07-24 14:18:57 +0200 | [diff] [blame] | 250 | debugfs_remove_recursive(root); |
| 251 | host->debugfs_root = NULL; |
| 252 | err_root: |
| 253 | dev_err(&host->class_dev, "failed to initialize debugfs\n"); |
| 254 | } |
| 255 | |
| 256 | void mmc_remove_host_debugfs(struct mmc_host *host) |
| 257 | { |
| 258 | debugfs_remove_recursive(host->debugfs_root); |
| 259 | } |
Haavard Skinnemoen | f4b7f92 | 2008-07-24 14:18:58 +0200 | [diff] [blame] | 260 | |
| 261 | static int mmc_dbg_card_status_get(void *data, u64 *val) |
| 262 | { |
| 263 | struct mmc_card *card = data; |
| 264 | u32 status; |
| 265 | int ret; |
| 266 | |
Ulf Hansson | e94cfef | 2013-05-02 14:02:38 +0200 | [diff] [blame] | 267 | mmc_get_card(card); |
Haavard Skinnemoen | f4b7f92 | 2008-07-24 14:18:58 +0200 | [diff] [blame] | 268 | |
| 269 | ret = mmc_send_status(data, &status); |
| 270 | if (!ret) |
| 271 | *val = status; |
| 272 | |
Ulf Hansson | e94cfef | 2013-05-02 14:02:38 +0200 | [diff] [blame] | 273 | mmc_put_card(card); |
Haavard Skinnemoen | f4b7f92 | 2008-07-24 14:18:58 +0200 | [diff] [blame] | 274 | |
| 275 | return ret; |
| 276 | } |
| 277 | DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get, |
| 278 | NULL, "%08llx\n"); |
| 279 | |
Adrian Hunter | 736bb6b | 2009-02-11 14:52:20 +0200 | [diff] [blame] | 280 | #define EXT_CSD_STR_LEN 1025 |
| 281 | |
| 282 | static int mmc_ext_csd_open(struct inode *inode, struct file *filp) |
| 283 | { |
| 284 | struct mmc_card *card = inode->i_private; |
| 285 | char *buf; |
| 286 | ssize_t n = 0; |
| 287 | u8 *ext_csd; |
| 288 | int err, i; |
| 289 | |
| 290 | buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL); |
| 291 | if (!buf) |
| 292 | return -ENOMEM; |
| 293 | |
Ulf Hansson | e94cfef | 2013-05-02 14:02:38 +0200 | [diff] [blame] | 294 | mmc_get_card(card); |
Ulf Hansson | b2cada7 | 2014-10-17 11:48:23 +0200 | [diff] [blame] | 295 | err = mmc_get_ext_csd(card, &ext_csd); |
Ulf Hansson | e94cfef | 2013-05-02 14:02:38 +0200 | [diff] [blame] | 296 | mmc_put_card(card); |
Adrian Hunter | 736bb6b | 2009-02-11 14:52:20 +0200 | [diff] [blame] | 297 | if (err) |
| 298 | goto out_free; |
| 299 | |
Venkatraman S | 6780162 | 2012-08-07 19:29:06 +0530 | [diff] [blame] | 300 | for (i = 0; i < 512; i++) |
Adrian Hunter | 736bb6b | 2009-02-11 14:52:20 +0200 | [diff] [blame] | 301 | n += sprintf(buf + n, "%02x", ext_csd[i]); |
| 302 | n += sprintf(buf + n, "\n"); |
| 303 | BUG_ON(n != EXT_CSD_STR_LEN); |
| 304 | |
| 305 | filp->private_data = buf; |
| 306 | kfree(ext_csd); |
| 307 | return 0; |
| 308 | |
| 309 | out_free: |
| 310 | kfree(buf); |
Adrian Hunter | 736bb6b | 2009-02-11 14:52:20 +0200 | [diff] [blame] | 311 | return err; |
| 312 | } |
| 313 | |
| 314 | static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf, |
| 315 | size_t cnt, loff_t *ppos) |
| 316 | { |
| 317 | char *buf = filp->private_data; |
| 318 | |
| 319 | return simple_read_from_buffer(ubuf, cnt, ppos, |
| 320 | buf, EXT_CSD_STR_LEN); |
| 321 | } |
| 322 | |
| 323 | static int mmc_ext_csd_release(struct inode *inode, struct file *file) |
| 324 | { |
| 325 | kfree(file->private_data); |
| 326 | return 0; |
| 327 | } |
| 328 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 329 | static const struct file_operations mmc_dbg_ext_csd_fops = { |
Adrian Hunter | 736bb6b | 2009-02-11 14:52:20 +0200 | [diff] [blame] | 330 | .open = mmc_ext_csd_open, |
| 331 | .read = mmc_ext_csd_read, |
| 332 | .release = mmc_ext_csd_release, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 333 | .llseek = default_llseek, |
Adrian Hunter | 736bb6b | 2009-02-11 14:52:20 +0200 | [diff] [blame] | 334 | }; |
| 335 | |
Haavard Skinnemoen | f4b7f92 | 2008-07-24 14:18:58 +0200 | [diff] [blame] | 336 | void mmc_add_card_debugfs(struct mmc_card *card) |
| 337 | { |
| 338 | struct mmc_host *host = card->host; |
| 339 | struct dentry *root; |
| 340 | |
| 341 | if (!host->debugfs_root) |
| 342 | return; |
| 343 | |
| 344 | root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root); |
| 345 | if (IS_ERR(root)) |
| 346 | /* Don't complain -- debugfs just isn't enabled */ |
| 347 | return; |
| 348 | if (!root) |
| 349 | /* Complain -- debugfs is enabled, but it failed to |
| 350 | * create the directory. */ |
| 351 | goto err; |
| 352 | |
| 353 | card->debugfs_root = root; |
| 354 | |
| 355 | if (!debugfs_create_x32("state", S_IRUSR, root, &card->state)) |
| 356 | goto err; |
| 357 | |
| 358 | if (mmc_card_mmc(card) || mmc_card_sd(card)) |
| 359 | if (!debugfs_create_file("status", S_IRUSR, root, card, |
| 360 | &mmc_dbg_card_status_fops)) |
| 361 | goto err; |
| 362 | |
Adrian Hunter | 736bb6b | 2009-02-11 14:52:20 +0200 | [diff] [blame] | 363 | if (mmc_card_mmc(card)) |
| 364 | if (!debugfs_create_file("ext_csd", S_IRUSR, root, card, |
| 365 | &mmc_dbg_ext_csd_fops)) |
| 366 | goto err; |
| 367 | |
Haavard Skinnemoen | f4b7f92 | 2008-07-24 14:18:58 +0200 | [diff] [blame] | 368 | return; |
| 369 | |
| 370 | err: |
| 371 | debugfs_remove_recursive(root); |
| 372 | card->debugfs_root = NULL; |
| 373 | dev_err(&card->dev, "failed to initialize debugfs\n"); |
| 374 | } |
| 375 | |
| 376 | void mmc_remove_card_debugfs(struct mmc_card *card) |
| 377 | { |
| 378 | debugfs_remove_recursive(card->debugfs_root); |
| 379 | } |