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_SDR50:
130 str = "sd uhs SDR50";
132 case MMC_TIMING_UHS_SDR104:
133 str = "sd uhs SDR104";
135 case MMC_TIMING_UHS_DDR50:
136 str = "sd uhs DDR50";
138 case MMC_TIMING_MMC_DDR52:
141 case MMC_TIMING_MMC_HS200:
142 str = "mmc high-speed SDR200";
148 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
150 switch (ios->signal_voltage) {
151 case MMC_SIGNAL_VOLTAGE_330:
154 case MMC_SIGNAL_VOLTAGE_180:
157 case MMC_SIGNAL_VOLTAGE_120:
164 seq_printf(s, "signal voltage:\t%u (%s)\n", ios->chip_select, str);
169 static int mmc_ios_open(struct inode *inode, struct file *file)
171 return single_open(file, mmc_ios_show, inode->i_private);
174 static const struct file_operations mmc_ios_fops = {
175 .open = mmc_ios_open,
178 .release = single_release,
181 static int mmc_clock_opt_get(void *data, u64 *val)
183 struct mmc_host *host = data;
185 *val = host->ios.clock;
190 static int mmc_clock_opt_set(void *data, u64 val)
192 struct mmc_host *host = data;
194 /* We need this check due to input value is u64 */
195 if (val > host->f_max)
198 mmc_claim_host(host);
199 mmc_set_clock(host, (unsigned int) val);
200 mmc_release_host(host);
205 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
208 void mmc_add_host_debugfs(struct mmc_host *host)
212 root = debugfs_create_dir(mmc_hostname(host), NULL);
214 /* Don't complain -- debugfs just isn't enabled */
217 /* Complain -- debugfs is enabled, but it failed to
218 * create the directory. */
221 host->debugfs_root = root;
223 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
226 if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
230 #ifdef CONFIG_MMC_CLKGATE
231 if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
232 root, &host->clk_delay))
235 #ifdef CONFIG_FAIL_MMC_REQUEST
237 setup_fault_attr(&fail_default_attr, fail_request);
238 host->fail_mmc_request = fail_default_attr;
239 if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
241 &host->fail_mmc_request)))
247 debugfs_remove_recursive(root);
248 host->debugfs_root = NULL;
250 dev_err(&host->class_dev, "failed to initialize debugfs\n");
253 void mmc_remove_host_debugfs(struct mmc_host *host)
255 debugfs_remove_recursive(host->debugfs_root);
258 static int mmc_dbg_card_status_get(void *data, u64 *val)
260 struct mmc_card *card = data;
266 ret = mmc_send_status(data, &status);
274 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
277 #define EXT_CSD_STR_LEN 1025
279 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
281 struct mmc_card *card = inode->i_private;
287 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
291 ext_csd = kmalloc(512, GFP_KERNEL);
298 err = mmc_send_ext_csd(card, ext_csd);
303 for (i = 0; i < 512; i++)
304 n += sprintf(buf + n, "%02x", ext_csd[i]);
305 n += sprintf(buf + n, "\n");
306 BUG_ON(n != EXT_CSD_STR_LEN);
308 filp->private_data = buf;
318 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
319 size_t cnt, loff_t *ppos)
321 char *buf = filp->private_data;
323 return simple_read_from_buffer(ubuf, cnt, ppos,
324 buf, EXT_CSD_STR_LEN);
327 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
329 kfree(file->private_data);
333 static const struct file_operations mmc_dbg_ext_csd_fops = {
334 .open = mmc_ext_csd_open,
335 .read = mmc_ext_csd_read,
336 .release = mmc_ext_csd_release,
337 .llseek = default_llseek,
340 void mmc_add_card_debugfs(struct mmc_card *card)
342 struct mmc_host *host = card->host;
345 if (!host->debugfs_root)
348 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
350 /* Don't complain -- debugfs just isn't enabled */
353 /* Complain -- debugfs is enabled, but it failed to
354 * create the directory. */
357 card->debugfs_root = root;
359 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
362 if (mmc_card_mmc(card) || mmc_card_sd(card))
363 if (!debugfs_create_file("status", S_IRUSR, root, card,
364 &mmc_dbg_card_status_fops))
367 if (mmc_card_mmc(card))
368 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
369 &mmc_dbg_ext_csd_fops))
375 debugfs_remove_recursive(root);
376 card->debugfs_root = NULL;
377 dev_err(&card->dev, "failed to initialize debugfs\n");
380 void mmc_remove_card_debugfs(struct mmc_card *card)
382 debugfs_remove_recursive(card->debugfs_root);