2 * Debugfs support for hosts and cards
4 * Copyright (C) 2008 Atmel Corporation
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.
10 #include <linux/moduleparam.h>
11 #include <linux/export.h>
12 #include <linux/debugfs.h>
14 #include <linux/seq_file.h>
15 #include <linux/slab.h>
16 #include <linux/stat.h>
17 #include <linux/fault-inject.h>
19 #include <linux/mmc/card.h>
20 #include <linux/mmc/host.h>
27 #ifdef CONFIG_FAIL_MMC_REQUEST
29 static DECLARE_FAULT_ATTR(fail_default_attr);
30 static char *fail_request;
31 module_param(fail_request, charp, 0);
33 #endif /* CONFIG_FAIL_MMC_REQUEST */
35 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
36 static int mmc_ios_show(struct seq_file *s, void *data)
38 static const char *vdd_str[] = {
57 struct mmc_host *host = s->private;
58 struct mmc_ios *ios = &host->ios;
61 seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
62 if (host->actual_clock)
63 seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
64 seq_printf(s, "vdd:\t\t%u ", ios->vdd);
65 if ((1 << ios->vdd) & MMC_VDD_165_195)
66 seq_printf(s, "(1.65 - 1.95 V)\n");
67 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
68 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
69 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
70 vdd_str[ios->vdd + 1]);
72 seq_printf(s, "(invalid)\n");
74 switch (ios->bus_mode) {
75 case MMC_BUSMODE_OPENDRAIN:
78 case MMC_BUSMODE_PUSHPULL:
85 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
87 switch (ios->chip_select) {
101 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
103 switch (ios->power_mode) {
117 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
118 seq_printf(s, "bus width:\t%u (%u bits)\n",
119 ios->bus_width, 1 << ios->bus_width);
121 switch (ios->timing) {
122 case MMC_TIMING_LEGACY:
125 case MMC_TIMING_MMC_HS:
126 str = "mmc high-speed";
128 case MMC_TIMING_SD_HS:
129 str = "sd high-speed";
131 case MMC_TIMING_UHS_SDR12:
132 str = "sd uhs SDR12";
134 case MMC_TIMING_UHS_SDR25:
135 str = "sd uhs SDR25";
137 case MMC_TIMING_UHS_SDR50:
138 str = "sd uhs SDR50";
140 case MMC_TIMING_UHS_SDR104:
141 str = "sd uhs SDR104";
143 case MMC_TIMING_UHS_DDR50:
144 str = "sd uhs DDR50";
146 case MMC_TIMING_MMC_DDR52:
149 case MMC_TIMING_MMC_HS200:
152 case MMC_TIMING_MMC_HS400:
153 str = mmc_card_hs400es(host->card) ?
154 "mmc HS400 enhanced strobe" : "mmc HS400";
160 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
162 switch (ios->signal_voltage) {
163 case MMC_SIGNAL_VOLTAGE_330:
166 case MMC_SIGNAL_VOLTAGE_180:
169 case MMC_SIGNAL_VOLTAGE_120:
176 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
178 switch (ios->drv_type) {
179 case MMC_SET_DRIVER_TYPE_A:
180 str = "driver type A";
182 case MMC_SET_DRIVER_TYPE_B:
183 str = "driver type B";
185 case MMC_SET_DRIVER_TYPE_C:
186 str = "driver type C";
188 case MMC_SET_DRIVER_TYPE_D:
189 str = "driver type D";
195 seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str);
199 DEFINE_SHOW_ATTRIBUTE(mmc_ios);
201 static int mmc_clock_opt_get(void *data, u64 *val)
203 struct mmc_host *host = data;
205 *val = host->ios.clock;
210 static int mmc_clock_opt_set(void *data, u64 val)
212 struct mmc_host *host = data;
214 /* We need this check due to input value is u64 */
215 if (val != 0 && (val > host->f_max || val < host->f_min))
218 mmc_claim_host(host);
219 mmc_set_clock(host, (unsigned int) val);
220 mmc_release_host(host);
225 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
228 void mmc_add_host_debugfs(struct mmc_host *host)
232 root = debugfs_create_dir(mmc_hostname(host), NULL);
234 /* Don't complain -- debugfs just isn't enabled */
237 /* Complain -- debugfs is enabled, but it failed to
238 * create the directory. */
241 host->debugfs_root = root;
243 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
246 if (!debugfs_create_x32("caps", S_IRUSR, root, &host->caps))
249 if (!debugfs_create_x32("caps2", S_IRUSR, root, &host->caps2))
252 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
256 #ifdef CONFIG_FAIL_MMC_REQUEST
258 setup_fault_attr(&fail_default_attr, fail_request);
259 host->fail_mmc_request = fail_default_attr;
260 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
262 &host->fail_mmc_request)))
268 debugfs_remove_recursive(root);
269 host->debugfs_root = NULL;
271 dev_err(&host->class_dev, "failed to initialize debugfs\n");
274 void mmc_remove_host_debugfs(struct mmc_host *host)
276 debugfs_remove_recursive(host->debugfs_root);
279 void mmc_add_card_debugfs(struct mmc_card *card)
281 struct mmc_host *host = card->host;
284 if (!host->debugfs_root)
287 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
289 /* Don't complain -- debugfs just isn't enabled */
292 /* Complain -- debugfs is enabled, but it failed to
293 * create the directory. */
296 card->debugfs_root = root;
298 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
304 debugfs_remove_recursive(root);
305 card->debugfs_root = NULL;
306 dev_err(&card->dev, "failed to initialize debugfs\n");
309 void mmc_remove_card_debugfs(struct mmc_card *card)
311 debugfs_remove_recursive(card->debugfs_root);
312 card->debugfs_root = NULL;