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>
25 #ifdef CONFIG_FAIL_MMC_REQUEST
27 static DECLARE_FAULT_ATTR(fail_default_attr);
28 static char *fail_request;
29 module_param(fail_request, charp, 0);
31 #endif /* CONFIG_FAIL_MMC_REQUEST */
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)
36 static const char *vdd_str[] = {
55 struct mmc_host *host = s->private;
56 struct mmc_ios *ios = &host->ios;
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]);
70 seq_printf(s, "(invalid)\n");
72 switch (ios->bus_mode) {
73 case MMC_BUSMODE_OPENDRAIN:
76 case MMC_BUSMODE_PUSHPULL:
83 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
85 switch (ios->chip_select) {
99 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
101 switch (ios->power_mode) {
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);
119 switch (ios->timing) {
120 case MMC_TIMING_LEGACY:
123 case MMC_TIMING_MMC_HS:
124 str = "mmc high-speed";
126 case MMC_TIMING_SD_HS:
127 str = "sd high-speed";
129 case MMC_TIMING_UHS_SDR12:
130 str = "sd uhs SDR12";
132 case MMC_TIMING_UHS_SDR25:
133 str = "sd uhs SDR25";
135 case MMC_TIMING_UHS_SDR50:
136 str = "sd uhs SDR50";
138 case MMC_TIMING_UHS_SDR104:
139 str = "sd uhs SDR104";
141 case MMC_TIMING_UHS_DDR50:
142 str = "sd uhs DDR50";
144 case MMC_TIMING_MMC_DDR52:
147 case MMC_TIMING_MMC_HS200:
150 case MMC_TIMING_MMC_HS400:
151 str = mmc_card_hs400es(host->card) ?
152 "mmc HS400 enhanced strobe" : "mmc HS400";
158 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
160 switch (ios->signal_voltage) {
161 case MMC_SIGNAL_VOLTAGE_330:
164 case MMC_SIGNAL_VOLTAGE_180:
167 case MMC_SIGNAL_VOLTAGE_120:
174 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->signal_voltage, str);
176 switch (ios->drv_type) {
177 case MMC_SET_DRIVER_TYPE_A:
178 str = "driver type A";
180 case MMC_SET_DRIVER_TYPE_B:
181 str = "driver type B";
183 case MMC_SET_DRIVER_TYPE_C:
184 str = "driver type C";
186 case MMC_SET_DRIVER_TYPE_D:
187 str = "driver type D";
193 seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, str);
198 static int mmc_ios_open(struct inode *inode, struct file *file)
200 return single_open(file, mmc_ios_show, inode->i_private);
203 static const struct file_operations mmc_ios_fops = {
204 .open = mmc_ios_open,
207 .release = single_release,
210 static int mmc_clock_opt_get(void *data, u64 *val)
212 struct mmc_host *host = data;
214 *val = host->ios.clock;
219 static int mmc_clock_opt_set(void *data, u64 val)
221 struct mmc_host *host = data;
223 /* We need this check due to input value is u64 */
224 if (val != 0 && (val > host->f_max || val < host->f_min))
227 mmc_claim_host(host);
228 mmc_set_clock(host, (unsigned int) val);
229 mmc_release_host(host);
234 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
237 void mmc_add_host_debugfs(struct mmc_host *host)
241 root = debugfs_create_dir(mmc_hostname(host), NULL);
243 /* Don't complain -- debugfs just isn't enabled */
246 /* Complain -- debugfs is enabled, but it failed to
247 * create the directory. */
250 host->debugfs_root = root;
252 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
255 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
259 #ifdef CONFIG_FAIL_MMC_REQUEST
261 setup_fault_attr(&fail_default_attr, fail_request);
262 host->fail_mmc_request = fail_default_attr;
263 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
265 &host->fail_mmc_request)))
271 debugfs_remove_recursive(root);
272 host->debugfs_root = NULL;
274 dev_err(&host->class_dev, "failed to initialize debugfs\n");
277 void mmc_remove_host_debugfs(struct mmc_host *host)
279 debugfs_remove_recursive(host->debugfs_root);
282 static int mmc_dbg_card_status_get(void *data, u64 *val)
284 struct mmc_card *card = data;
290 ret = mmc_send_status(data, &status);
298 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
301 #define EXT_CSD_STR_LEN 1025
303 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
305 struct mmc_card *card = inode->i_private;
311 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
316 err = mmc_get_ext_csd(card, &ext_csd);
321 for (i = 0; i < 512; i++)
322 n += sprintf(buf + n, "%02x", ext_csd[i]);
323 n += sprintf(buf + n, "\n");
325 if (n != EXT_CSD_STR_LEN) {
330 filp->private_data = buf;
339 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
340 size_t cnt, loff_t *ppos)
342 char *buf = filp->private_data;
344 return simple_read_from_buffer(ubuf, cnt, ppos,
345 buf, EXT_CSD_STR_LEN);
348 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
350 kfree(file->private_data);
354 static const struct file_operations mmc_dbg_ext_csd_fops = {
355 .open = mmc_ext_csd_open,
356 .read = mmc_ext_csd_read,
357 .release = mmc_ext_csd_release,
358 .llseek = default_llseek,
361 void mmc_add_card_debugfs(struct mmc_card *card)
363 struct mmc_host *host = card->host;
366 if (!host->debugfs_root)
369 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
371 /* Don't complain -- debugfs just isn't enabled */
374 /* Complain -- debugfs is enabled, but it failed to
375 * create the directory. */
378 card->debugfs_root = root;
380 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
383 if (mmc_card_mmc(card) || mmc_card_sd(card))
384 if (!debugfs_create_file("status", S_IRUSR, root, card,
385 &mmc_dbg_card_status_fops))
388 if (mmc_card_mmc(card))
389 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
390 &mmc_dbg_ext_csd_fops))
396 debugfs_remove_recursive(root);
397 card->debugfs_root = NULL;
398 dev_err(&card->dev, "failed to initialize debugfs\n");
401 void mmc_remove_card_debugfs(struct mmc_card *card)
403 debugfs_remove_recursive(card->debugfs_root);