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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Debugfs support for hosts and cards4 *5 * Copyright (C) 2008 Atmel Corporation6 */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#include <linux/time.h>16 17#include <linux/mmc/card.h>18#include <linux/mmc/host.h>19#include <linux/mmc/mmc.h>20#include <linux/mmc/sd.h>21 22#include "core.h"23#include "card.h"24#include "host.h"25#include "mmc_ops.h"26 27#ifdef CONFIG_FAIL_MMC_REQUEST28 29static DECLARE_FAULT_ATTR(fail_default_attr);30static char *fail_request;31module_param(fail_request, charp, 0);32MODULE_PARM_DESC(fail_request, "default fault injection attributes");33 34#endif /* CONFIG_FAIL_MMC_REQUEST */35 36/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */37static int mmc_ios_show(struct seq_file *s, void *data)38{39 static const char *vdd_str[] = {40 [8] = "2.0",41 [9] = "2.1",42 [10] = "2.2",43 [11] = "2.3",44 [12] = "2.4",45 [13] = "2.5",46 [14] = "2.6",47 [15] = "2.7",48 [16] = "2.8",49 [17] = "2.9",50 [18] = "3.0",51 [19] = "3.1",52 [20] = "3.2",53 [21] = "3.3",54 [22] = "3.4",55 [23] = "3.5",56 [24] = "3.6",57 };58 struct mmc_host *host = s->private;59 struct mmc_ios *ios = &host->ios;60 const char *str;61 62 seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);63 if (host->actual_clock)64 seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);65 seq_printf(s, "vdd:\t\t%u ", ios->vdd);66 if ((1 << ios->vdd) & MMC_VDD_165_195)67 seq_printf(s, "(1.65 - 1.95 V)\n");68 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)69 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])70 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],71 vdd_str[ios->vdd + 1]);72 else73 seq_printf(s, "(invalid)\n");74 75 switch (ios->bus_mode) {76 case MMC_BUSMODE_OPENDRAIN:77 str = "open drain";78 break;79 case MMC_BUSMODE_PUSHPULL:80 str = "push-pull";81 break;82 default:83 str = "invalid";84 break;85 }86 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);87 88 switch (ios->chip_select) {89 case MMC_CS_DONTCARE:90 str = "don't care";91 break;92 case MMC_CS_HIGH:93 str = "active high";94 break;95 case MMC_CS_LOW:96 str = "active low";97 break;98 default:99 str = "invalid";100 break;101 }102 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);103 104 switch (ios->power_mode) {105 case MMC_POWER_OFF:106 str = "off";107 break;108 case MMC_POWER_UP:109 str = "up";110 break;111 case MMC_POWER_ON:112 str = "on";113 break;114 default:115 str = "invalid";116 break;117 }118 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);119 seq_printf(s, "bus width:\t%u (%u bits)\n",120 ios->bus_width, 1 << ios->bus_width);121 122 switch (ios->timing) {123 case MMC_TIMING_LEGACY:124 str = "legacy";125 break;126 case MMC_TIMING_MMC_HS:127 str = "mmc high-speed";128 break;129 case MMC_TIMING_SD_HS:130 str = "sd high-speed";131 break;132 case MMC_TIMING_UHS_SDR12:133 str = "sd uhs SDR12";134 break;135 case MMC_TIMING_UHS_SDR25:136 str = "sd uhs SDR25";137 break;138 case MMC_TIMING_UHS_SDR50:139 str = "sd uhs SDR50";140 break;141 case MMC_TIMING_UHS_SDR104:142 str = "sd uhs SDR104";143 break;144 case MMC_TIMING_UHS_DDR50:145 str = "sd uhs DDR50";146 break;147 case MMC_TIMING_MMC_DDR52:148 str = "mmc DDR52";149 break;150 case MMC_TIMING_MMC_HS200:151 str = "mmc HS200";152 break;153 case MMC_TIMING_MMC_HS400:154 str = mmc_card_hs400es(host->card) ?155 "mmc HS400 enhanced strobe" : "mmc HS400";156 break;157 default:158 str = "invalid";159 break;160 }161 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);162 163 switch (ios->signal_voltage) {164 case MMC_SIGNAL_VOLTAGE_330:165 str = "3.30 V";166 break;167 case MMC_SIGNAL_VOLTAGE_180:168 str = "1.80 V";169 break;170 case MMC_SIGNAL_VOLTAGE_120:171 str = "1.20 V";172 break;173 default:174 str = "invalid";175 break;176 }177 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);178 179 switch (ios->drv_type) {180 case MMC_SET_DRIVER_TYPE_A:181 str = "driver type A";182 break;183 case MMC_SET_DRIVER_TYPE_B:184 str = "driver type B";185 break;186 case MMC_SET_DRIVER_TYPE_C:187 str = "driver type C";188 break;189 case MMC_SET_DRIVER_TYPE_D:190 str = "driver type D";191 break;192 default:193 str = "invalid";194 break;195 }196 seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str);197 198 return 0;199}200DEFINE_SHOW_ATTRIBUTE(mmc_ios);201 202static int mmc_clock_opt_get(void *data, u64 *val)203{204 struct mmc_host *host = data;205 206 *val = host->ios.clock;207 208 return 0;209}210 211static int mmc_clock_opt_set(void *data, u64 val)212{213 struct mmc_host *host = data;214 215 /* We need this check due to input value is u64 */216 if (val != 0 && (val > host->f_max || val < host->f_min))217 return -EINVAL;218 219 mmc_claim_host(host);220 mmc_set_clock(host, (unsigned int) val);221 mmc_release_host(host);222 223 return 0;224}225 226DEFINE_DEBUGFS_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,227 "%llu\n");228 229static int mmc_err_state_get(void *data, u64 *val)230{231 struct mmc_host *host = data;232 int i;233 234 if (!host)235 return -EINVAL;236 237 *val = 0;238 for (i = 0; i < MMC_ERR_MAX; i++) {239 if (host->err_stats[i]) {240 *val = 1;241 break;242 }243 }244 245 return 0;246}247 248DEFINE_DEBUGFS_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");249 250static int mmc_err_stats_show(struct seq_file *file, void *data)251{252 struct mmc_host *host = file->private;253 const char *desc[MMC_ERR_MAX] = {254 [MMC_ERR_CMD_TIMEOUT] = "Command Timeout Occurred",255 [MMC_ERR_CMD_CRC] = "Command CRC Errors Occurred",256 [MMC_ERR_DAT_TIMEOUT] = "Data Timeout Occurred",257 [MMC_ERR_DAT_CRC] = "Data CRC Errors Occurred",258 [MMC_ERR_AUTO_CMD] = "Auto-Cmd Error Occurred",259 [MMC_ERR_ADMA] = "ADMA Error Occurred",260 [MMC_ERR_TUNING] = "Tuning Error Occurred",261 [MMC_ERR_CMDQ_RED] = "CMDQ RED Errors",262 [MMC_ERR_CMDQ_GCE] = "CMDQ GCE Errors",263 [MMC_ERR_CMDQ_ICCE] = "CMDQ ICCE Errors",264 [MMC_ERR_REQ_TIMEOUT] = "Request Timedout",265 [MMC_ERR_CMDQ_REQ_TIMEOUT] = "CMDQ Request Timedout",266 [MMC_ERR_ICE_CFG] = "ICE Config Errors",267 [MMC_ERR_CTRL_TIMEOUT] = "Controller Timedout errors",268 [MMC_ERR_UNEXPECTED_IRQ] = "Unexpected IRQ errors",269 };270 int i;271 272 for (i = 0; i < MMC_ERR_MAX; i++) {273 if (desc[i])274 seq_printf(file, "# %s:\t %d\n",275 desc[i], host->err_stats[i]);276 }277 278 return 0;279}280 281static int mmc_err_stats_open(struct inode *inode, struct file *file)282{283 return single_open(file, mmc_err_stats_show, inode->i_private);284}285 286static ssize_t mmc_err_stats_write(struct file *filp, const char __user *ubuf,287 size_t cnt, loff_t *ppos)288{289 struct mmc_host *host = filp->f_mapping->host->i_private;290 291 pr_debug("%s: Resetting MMC error statistics\n", __func__);292 memset(host->err_stats, 0, sizeof(host->err_stats));293 294 return cnt;295}296 297static const struct file_operations mmc_err_stats_fops = {298 .open = mmc_err_stats_open,299 .read = seq_read,300 .write = mmc_err_stats_write,301 .release = single_release,302};303 304static int mmc_caps_get(void *data, u64 *val)305{306 *val = *(u32 *)data;307 return 0;308}309 310static int mmc_caps_set(void *data, u64 val)311{312 u32 *caps = data;313 u32 diff = *caps ^ val;314 u32 allowed = MMC_CAP_AGGRESSIVE_PM |315 MMC_CAP_SD_HIGHSPEED |316 MMC_CAP_MMC_HIGHSPEED |317 MMC_CAP_UHS |318 MMC_CAP_DDR;319 320 if (diff & ~allowed)321 return -EINVAL;322 323 *caps = val;324 325 return 0;326}327 328static int mmc_caps2_set(void *data, u64 val)329{330 u32 allowed = MMC_CAP2_HSX00_1_8V | MMC_CAP2_HSX00_1_2V;331 u32 *caps = data;332 u32 diff = *caps ^ val;333 334 if (diff & ~allowed)335 return -EINVAL;336 337 *caps = val;338 339 return 0;340}341 342DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps_fops, mmc_caps_get, mmc_caps_set,343 "0x%08llx\n");344DEFINE_DEBUGFS_ATTRIBUTE(mmc_caps2_fops, mmc_caps_get, mmc_caps2_set,345 "0x%08llx\n");346 347void mmc_add_host_debugfs(struct mmc_host *host)348{349 struct dentry *root;350 351 root = debugfs_create_dir(mmc_hostname(host), NULL);352 host->debugfs_root = root;353 354 debugfs_create_file("ios", 0400, root, host, &mmc_ios_fops);355 debugfs_create_file("caps", 0600, root, &host->caps, &mmc_caps_fops);356 debugfs_create_file("caps2", 0600, root, &host->caps2,357 &mmc_caps2_fops);358 debugfs_create_file_unsafe("clock", 0600, root, host,359 &mmc_clock_fops);360 361 debugfs_create_file_unsafe("err_state", 0600, root, host,362 &mmc_err_state);363 debugfs_create_file("err_stats", 0600, root, host,364 &mmc_err_stats_fops);365 366#ifdef CONFIG_FAIL_MMC_REQUEST367 if (fail_request)368 setup_fault_attr(&fail_default_attr, fail_request);369 host->fail_mmc_request = fail_default_attr;370 fault_create_debugfs_attr("fail_mmc_request", root,371 &host->fail_mmc_request);372#endif373}374 375void mmc_remove_host_debugfs(struct mmc_host *host)376{377 debugfs_remove_recursive(host->debugfs_root);378}379 380void mmc_add_card_debugfs(struct mmc_card *card)381{382 struct mmc_host *host = card->host;383 struct dentry *root;384 385 if (!host->debugfs_root)386 return;387 388 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);389 card->debugfs_root = root;390 391 debugfs_create_x32("state", 0400, root, &card->state);392 debugfs_create_x32("quirks", 0400, root, &card->quirks);393}394 395void mmc_remove_card_debugfs(struct mmc_card *card)396{397 debugfs_remove_recursive(card->debugfs_root);398 card->debugfs_root = NULL;399}400