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 seq_printf(s, "vdd:\t\t%u ", ios->vdd);
61 if ((1 << ios->vdd) & MMC_VDD_165_195)
62 seq_printf(s, "(1.65 - 1.95 V)\n");
63 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
64 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
65 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
66 vdd_str[ios->vdd + 1]);
68 seq_printf(s, "(invalid)\n");
70 switch (ios->bus_mode) {
71 case MMC_BUSMODE_OPENDRAIN:
74 case MMC_BUSMODE_PUSHPULL:
81 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
83 switch (ios->chip_select) {
97 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
99 switch (ios->power_mode) {
113 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
114 seq_printf(s, "bus width:\t%u (%u bits)\n",
115 ios->bus_width, 1 << ios->bus_width);
117 switch (ios->timing) {
118 case MMC_TIMING_LEGACY:
121 case MMC_TIMING_MMC_HS:
122 str = "mmc high-speed";
124 case MMC_TIMING_SD_HS:
125 str = "sd high-speed";
127 case MMC_TIMING_UHS_SDR50:
128 str = "sd uhs SDR50";
130 case MMC_TIMING_UHS_SDR104:
131 str = "sd uhs SDR104";
133 case MMC_TIMING_UHS_DDR50:
134 str = "sd uhs DDR50";
140 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
145 static int mmc_ios_open(struct inode *inode, struct file *file)
147 return single_open(file, mmc_ios_show, inode->i_private);
150 static const struct file_operations mmc_ios_fops = {
151 .open = mmc_ios_open,
154 .release = single_release,
157 static int mmc_clock_opt_get(void *data, u64 *val)
159 struct mmc_host *host = data;
161 *val = host->ios.clock;
166 static int mmc_clock_opt_set(void *data, u64 val)
168 struct mmc_host *host = data;
170 /* We need this check due to input value is u64 */
171 if (val > host->f_max)
174 mmc_claim_host(host);
175 mmc_set_clock(host, (unsigned int) val);
176 mmc_release_host(host);
181 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
184 void mmc_add_host_debugfs(struct mmc_host *host)
188 root = debugfs_create_dir(mmc_hostname(host), NULL);
190 /* Don't complain -- debugfs just isn't enabled */
193 /* Complain -- debugfs is enabled, but it failed to
194 * create the directory. */
197 host->debugfs_root = root;
199 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
202 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
206 #ifdef CONFIG_MMC_CLKGATE
207 if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
208 root, &host->clk_delay))
211 #ifdef CONFIG_FAIL_MMC_REQUEST
213 setup_fault_attr(&fail_default_attr, fail_request);
214 host->fail_mmc_request = fail_default_attr;
215 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
217 &host->fail_mmc_request)))
223 debugfs_remove_recursive(root);
224 host->debugfs_root = NULL;
226 dev_err(&host->class_dev, "failed to initialize debugfs\n");
229 void mmc_remove_host_debugfs(struct mmc_host *host)
231 debugfs_remove_recursive(host->debugfs_root);
234 static int mmc_dbg_card_status_get(void *data, u64 *val)
236 struct mmc_card *card = data;
240 mmc_claim_host(card->host);
242 ret = mmc_send_status(data, &status);
246 mmc_release_host(card->host);
250 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
253 #define EXT_CSD_STR_LEN 1025
255 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
257 struct mmc_card *card = inode->i_private;
263 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
267 ext_csd = kmalloc(512, GFP_KERNEL);
273 mmc_claim_host(card->host);
274 err = mmc_send_ext_csd(card, ext_csd);
275 mmc_release_host(card->host);
279 for (i = 511; i >= 0; i--)
280 n += sprintf(buf + n, "%02x", ext_csd[i]);
281 n += sprintf(buf + n, "\n");
282 BUG_ON(n != EXT_CSD_STR_LEN);
284 filp->private_data = buf;
294 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
295 size_t cnt, loff_t *ppos)
297 char *buf = filp->private_data;
299 return simple_read_from_buffer(ubuf, cnt, ppos,
300 buf, EXT_CSD_STR_LEN);
303 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
305 kfree(file->private_data);
309 static const struct file_operations mmc_dbg_ext_csd_fops = {
310 .open = mmc_ext_csd_open,
311 .read = mmc_ext_csd_read,
312 .release = mmc_ext_csd_release,
313 .llseek = default_llseek,
316 void mmc_add_card_debugfs(struct mmc_card *card)
318 struct mmc_host *host = card->host;
321 if (!host->debugfs_root)
324 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
326 /* Don't complain -- debugfs just isn't enabled */
329 /* Complain -- debugfs is enabled, but it failed to
330 * create the directory. */
333 card->debugfs_root = root;
335 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
338 if (mmc_card_mmc(card) || mmc_card_sd(card))
339 if (!debugfs_create_file("status", S_IRUSR, root, card,
340 &mmc_dbg_card_status_fops))
343 if (mmc_card_mmc(card))
344 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
345 &mmc_dbg_ext_csd_fops))
351 debugfs_remove_recursive(root);
352 card->debugfs_root = NULL;
353 dev_err(&card->dev, "failed to initialize debugfs\n");
356 void mmc_remove_card_debugfs(struct mmc_card *card)
358 debugfs_remove_recursive(card->debugfs_root);