[linux-2.6-block.git] / drivers / mmc / core / debugfs.c

/*
 * Debugfs support for hosts and cards
 *
 * Copyright (C) 2008 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/fault-inject.h>

#include <linux/mmc/card.h>
#include <linux/mmc/host.h>

#include "core.h"
#include "mmc_ops.h"

#ifdef CONFIG_FAIL_MMC_REQUEST

static DECLARE_FAULT_ATTR(fail_default_attr);
static char *fail_request;
module_param(fail_request, charp, 0);

#endif /* CONFIG_FAIL_MMC_REQUEST */

/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
static int mmc_ios_show(struct seq_file *s, void *data)
{
	static const char *vdd_str[] = {
		[8]	= "2.0",
		[9]	= "2.1",
		[10]	= "2.2",
		[11]	= "2.3",
		[12]	= "2.4",
		[13]	= "2.5",
		[14]	= "2.6",
		[15]	= "2.7",
		[16]	= "2.8",
		[17]	= "2.9",
		[18]	= "3.0",
		[19]	= "3.1",
		[20]	= "3.2",
		[21]	= "3.3",
		[22]	= "3.4",
		[23]	= "3.5",
		[24]	= "3.6",
	};
	struct mmc_host	*host = s->private;
	struct mmc_ios	*ios = &host->ios;
	const char *str;

	seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
	seq_printf(s, "vdd:\t\t%u ", ios->vdd);
	if ((1 << ios->vdd) & MMC_VDD_165_195)
		seq_printf(s, "(1.65 - 1.95 V)\n");
	else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
			&& vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
		seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
				vdd_str[ios->vdd + 1]);
	else
		seq_printf(s, "(invalid)\n");

	switch (ios->bus_mode) {
	case MMC_BUSMODE_OPENDRAIN:
		str = "open drain";
		break;
	case MMC_BUSMODE_PUSHPULL:
		str = "push-pull";
		break;
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);

	switch (ios->chip_select) {
	case MMC_CS_DONTCARE:
		str = "don't care";
		break;
	case MMC_CS_HIGH:
		str = "active high";
		break;
	case MMC_CS_LOW:
		str = "active low";
		break;
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);

	switch (ios->power_mode) {
	case MMC_POWER_OFF:
		str = "off";
		break;
	case MMC_POWER_UP:
		str = "up";
		break;
	case MMC_POWER_ON:
		str = "on";
		break;
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
	seq_printf(s, "bus width:\t%u (%u bits)\n",
			ios->bus_width, 1 << ios->bus_width);

	switch (ios->timing) {
	case MMC_TIMING_LEGACY:
		str = "legacy";
		break;
	case MMC_TIMING_MMC_HS:
		str = "mmc high-speed";
		break;
	case MMC_TIMING_SD_HS:
		str = "sd high-speed";
		break;
	case MMC_TIMING_UHS_SDR50:
		str = "sd uhs SDR50";
		break;
	case MMC_TIMING_UHS_SDR104:
		str = "sd uhs SDR104";
		break;
	case MMC_TIMING_UHS_DDR50:
		str = "sd uhs DDR50";
		break;
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);

	return 0;
}

static int mmc_ios_open(struct inode *inode, struct file *file)
{
	return single_open(file, mmc_ios_show, inode->i_private);
}

static const struct file_operations mmc_ios_fops = {
	.open		= mmc_ios_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int mmc_clock_opt_get(void *data, u64 *val)
{
	struct mmc_host *host = data;

	*val = host->ios.clock;

	return 0;
}

static int mmc_clock_opt_set(void *data, u64 val)
{
	struct mmc_host *host = data;

	/* We need this check due to input value is u64 */
	if (val > host->f_max)
		return -EINVAL;

	mmc_claim_host(host);
	mmc_set_clock(host, (unsigned int) val);
	mmc_release_host(host);

	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
	"%llu\n");

void mmc_add_host_debugfs(struct mmc_host *host)
{
	struct dentry *root;

	root = debugfs_create_dir(mmc_hostname(host), NULL);
	if (IS_ERR(root))
		/* Don't complain -- debugfs just isn't enabled */
		return;
	if (!root)
		/* Complain -- debugfs is enabled, but it failed to
		 * create the directory. */
		goto err_root;

	host->debugfs_root = root;

	if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
		goto err_node;

	if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
			&mmc_clock_fops))
		goto err_node;

#ifdef CONFIG_MMC_CLKGATE
	if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
				root, &host->clk_delay))
		goto err_node;
#endif
#ifdef CONFIG_FAIL_MMC_REQUEST
	if (fail_request)
		setup_fault_attr(&fail_default_attr, fail_request);
	host->fail_mmc_request = fail_default_attr;
	if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
					     root,
					     &host->fail_mmc_request)))
		goto err_node;
#endif
	return;

err_node:
	debugfs_remove_recursive(root);
	host->debugfs_root = NULL;
err_root:
	dev_err(&host->class_dev, "failed to initialize debugfs\n");
}

void mmc_remove_host_debugfs(struct mmc_host *host)
{
	debugfs_remove_recursive(host->debugfs_root);
}

static int mmc_dbg_card_status_get(void *data, u64 *val)
{
	struct mmc_card	*card = data;
	u32		status;
	int		ret;

	mmc_claim_host(card->host);

	ret = mmc_send_status(data, &status);
	if (!ret)
		*val = status;

	mmc_release_host(card->host);

	return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
		NULL, "%08llx\n");

#define EXT_CSD_STR_LEN 1025

static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
{
	struct mmc_card *card = inode->i_private;
	char *buf;
	ssize_t n = 0;
	u8 *ext_csd;
	int err, i;

	buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	ext_csd = kmalloc(512, GFP_KERNEL);
	if (!ext_csd) {
		err = -ENOMEM;
		goto out_free;
	}

	mmc_claim_host(card->host);
	err = mmc_send_ext_csd(card, ext_csd);
	mmc_release_host(card->host);
	if (err)
		goto out_free;

	for (i = 511; i >= 0; i--)
		n += sprintf(buf + n, "%02x", ext_csd[i]);
	n += sprintf(buf + n, "\n");
	BUG_ON(n != EXT_CSD_STR_LEN);

	filp->private_data = buf;
	kfree(ext_csd);
	return 0;

out_free:
	kfree(buf);
	kfree(ext_csd);
	return err;
}

static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
				size_t cnt, loff_t *ppos)
{
	char *buf = filp->private_data;

	return simple_read_from_buffer(ubuf, cnt, ppos,
				       buf, EXT_CSD_STR_LEN);
}

static int mmc_ext_csd_release(struct inode *inode, struct file *file)
{
	kfree(file->private_data);
	return 0;
}

static const struct file_operations mmc_dbg_ext_csd_fops = {
	.open		= mmc_ext_csd_open,
	.read		= mmc_ext_csd_read,
	.release	= mmc_ext_csd_release,
	.llseek		= default_llseek,
};

void mmc_add_card_debugfs(struct mmc_card *card)
{
	struct mmc_host	*host = card->host;
	struct dentry	*root;

	if (!host->debugfs_root)
		return;

	root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
	if (IS_ERR(root))
		/* Don't complain -- debugfs just isn't enabled */
		return;
	if (!root)
		/* Complain -- debugfs is enabled, but it failed to
		 * create the directory. */
		goto err;

	card->debugfs_root = root;

	if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
		goto err;

	if (mmc_card_mmc(card) || mmc_card_sd(card))
		if (!debugfs_create_file("status", S_IRUSR, root, card,
					&mmc_dbg_card_status_fops))
			goto err;

	if (mmc_card_mmc(card))
		if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
					&mmc_dbg_ext_csd_fops))
			goto err;

	return;

err:
	debugfs_remove_recursive(root);
	card->debugfs_root = NULL;
	dev_err(&card->dev, "failed to initialize debugfs\n");
}

void mmc_remove_card_debugfs(struct mmc_card *card)
{
	debugfs_remove_recursive(card->debugfs_root);
}
Commit	Line	Data
6edd8ee6 HS	1	/*
	2	* Debugfs support for hosts and cards
	3	*
	4	* Copyright (C) 2008 Atmel Corporation
	5	*
	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.
	9	*/
	10	#include <linux/debugfs.h>
	11	#include <linux/fs.h>
	12	#include <linux/seq_file.h>
5a0e3ad6	13	#include <linux/slab.h>
6edd8ee6	14	#include <linux/stat.h>
1b676f70	15	#include <linux/fault-inject.h>
6edd8ee6	16
f4b7f927	17	#include <linux/mmc/card.h>
6edd8ee6 HS	18	#include <linux/mmc/host.h>
	19
	20	#include "core.h"
f4b7f927	21	#include "mmc_ops.h"
6edd8ee6	22
34f50508 PF	23	#ifdef CONFIG_FAIL_MMC_REQUEST
	24
	25	static DECLARE_FAULT_ATTR(fail_default_attr);
	26	static char *fail_request;
	27	module_param(fail_request, charp, 0);
	28
	29	#endif /* CONFIG_FAIL_MMC_REQUEST */
	30
6edd8ee6 HS	31	/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
	32	static int mmc_ios_show(struct seq_file s, void data)
	33	{
	34	static const char *vdd_str[] = {
	35	[8] = "2.0",
	36	[9] = "2.1",
	37	[10] = "2.2",
	38	[11] = "2.3",
	39	[12] = "2.4",
	40	[13] = "2.5",
	41	[14] = "2.6",
	42	[15] = "2.7",
	43	[16] = "2.8",
	44	[17] = "2.9",
	45	[18] = "3.0",
	46	[19] = "3.1",
	47	[20] = "3.2",
	48	[21] = "3.3",
	49	[22] = "3.4",
	50	[23] = "3.5",
	51	[24] = "3.6",
	52	};
	53	struct mmc_host *host = s->private;
	54	struct mmc_ios *ios = &host->ios;
	55	const char *str;
	56
	57	seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
	58	seq_printf(s, "vdd:\t\t%u ", ios->vdd);
	59	if ((1 << ios->vdd) & MMC_VDD_165_195)
	60	seq_printf(s, "(1.65 - 1.95 V)\n");
	61	else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
	62	&& vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
	63	seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
	64	vdd_str[ios->vdd + 1]);
	65	else
	66	seq_printf(s, "(invalid)\n");
	67
	68	switch (ios->bus_mode) {
	69	case MMC_BUSMODE_OPENDRAIN:
	70	str = "open drain";
	71	break;
	72	case MMC_BUSMODE_PUSHPULL:
	73	str = "push-pull";
	74	break;
	75	default:
	76	str = "invalid";
	77	break;
	78	}
	79	seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
	80
	81	switch (ios->chip_select) {
	82	case MMC_CS_DONTCARE:
	83	str = "don't care";
	84	break;
	85	case MMC_CS_HIGH:
	86	str = "active high";
	87	break;
	88	case MMC_CS_LOW:
	89	str = "active low";
	90	break;
	91	default:
	92	str = "invalid";
	93	break;
	94	}
95	seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
96
97	switch (ios->power_mode) {
98	case MMC_POWER_OFF:
99	str = "off";
100	break;
101	case MMC_POWER_UP:
102	str = "up";
103	break;
104	case MMC_POWER_ON:
105	str = "on";
106	break;
107	default:
108	str = "invalid";
109	break;
110	}
111	seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
112	seq_printf(s, "bus width:\t%u (%u bits)\n",
113	ios->bus_width, 1 << ios->bus_width);
114
115	switch (ios->timing) {
116	case MMC_TIMING_LEGACY:
117	str = "legacy";
118	break;
119	case MMC_TIMING_MMC_HS:
120	str = "mmc high-speed";
121	break;
122	case MMC_TIMING_SD_HS:
123	str = "sd high-speed";
124	break;
cd8a3666 AL	125	case MMC_TIMING_UHS_SDR50:
	126	str = "sd uhs SDR50";
	127	break;
	128	case MMC_TIMING_UHS_SDR104:
	129	str = "sd uhs SDR104";
	130	break;
	131	case MMC_TIMING_UHS_DDR50:
	132	str = "sd uhs DDR50";
	133	break;
6edd8ee6 HS	134	default:
	135	str = "invalid";
	136	break;
	137	}
	138	seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
	139
	140	return 0;
	141	}
	142
	143	static int mmc_ios_open(struct inode inode, struct file file)
	144	{
	145	return single_open(file, mmc_ios_show, inode->i_private);
	146	}
	147
	148	static const struct file_operations mmc_ios_fops = {
	149	.open = mmc_ios_open,
	150	.read = seq_read,
	151	.llseek = seq_lseek,
	152	.release = single_release,
	153	};
	154
703aae3d AS	155	static int mmc_clock_opt_get(void data, u64 val)
	156	{
	157	struct mmc_host *host = data;
	158
	159	*val = host->ios.clock;
	160
	161	return 0;
	162	}
	163
	164	static int mmc_clock_opt_set(void *data, u64 val)
	165	{
	166	struct mmc_host *host = data;
	167
	168	/* We need this check due to input value is u64 */
	169	if (val > host->f_max)
	170	return -EINVAL;
	171
	172	mmc_claim_host(host);
	173	mmc_set_clock(host, (unsigned int) val);
	174	mmc_release_host(host);
	175
	176	return 0;
	177	}
	178
	179	DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
	180	"%llu\n");
	181
6edd8ee6 HS	182	void mmc_add_host_debugfs(struct mmc_host *host)
	183	{
	184	struct dentry *root;
	185
	186	root = debugfs_create_dir(mmc_hostname(host), NULL);
	187	if (IS_ERR(root))
	188	/* Don't complain -- debugfs just isn't enabled */
	189	return;
	190	if (!root)
	191	/* Complain -- debugfs is enabled, but it failed to
	192	* create the directory. */
	193	goto err_root;
	194
	195	host->debugfs_root = root;
	196
	197	if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
703aae3d AS	198	goto err_node;
	199
	200	if (!debugfs_create_file("clock", S_IRUSR \| S_IWUSR, root, host,
	201	&mmc_clock_fops))
	202	goto err_node;
6edd8ee6	203
04566831 LW	204	#ifdef CONFIG_MMC_CLKGATE
	205	if (!debugfs_create_u32("clk_delay", (S_IRUSR \| S_IWUSR),
	206	root, &host->clk_delay))
	207	goto err_node;
1b676f70 PF	208	#endif
1b676f70 PF	209	#ifdef CONFIG_FAIL_MMC_REQUEST
34f50508 PF	210	if (fail_request)
	211	setup_fault_attr(&fail_default_attr, fail_request);
	212	host->fail_mmc_request = fail_default_attr;
1b676f70 PF	213	if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
	214	root,
	215	&host->fail_mmc_request)))
	216	goto err_node;
04566831	217	#endif
6edd8ee6 HS	218	return;
6edd8ee6 HS	219
703aae3d	220	err_node:
6edd8ee6 HS	221	debugfs_remove_recursive(root);
	222	host->debugfs_root = NULL;
	223	err_root:
	224	dev_err(&host->class_dev, "failed to initialize debugfs\n");
	225	}
	226
	227	void mmc_remove_host_debugfs(struct mmc_host *host)
	228	{
	229	debugfs_remove_recursive(host->debugfs_root);
	230	}
f4b7f927 HS	231
	232	static int mmc_dbg_card_status_get(void data, u64 val)
	233	{
	234	struct mmc_card *card = data;
	235	u32 status;
	236	int ret;
	237
	238	mmc_claim_host(card->host);
	239
	240	ret = mmc_send_status(data, &status);
	241	if (!ret)
	242	*val = status;
	243
	244	mmc_release_host(card->host);
	245
	246	return ret;
	247	}
	248	DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
	249	NULL, "%08llx\n");
	250
736bb6bb AH	251	#define EXT_CSD_STR_LEN 1025
	252
	253	static int mmc_ext_csd_open(struct inode inode, struct file filp)
	254	{
	255	struct mmc_card *card = inode->i_private;
	256	char *buf;
	257	ssize_t n = 0;
	258	u8 *ext_csd;
	259	int err, i;
	260
	261	buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
	262	if (!buf)
	263	return -ENOMEM;
	264
	265	ext_csd = kmalloc(512, GFP_KERNEL);
	266	if (!ext_csd) {
	267	err = -ENOMEM;
	268	goto out_free;
	269	}
	270
	271	mmc_claim_host(card->host);
	272	err = mmc_send_ext_csd(card, ext_csd);
	273	mmc_release_host(card->host);
	274	if (err)
	275	goto out_free;
	276
	277	for (i = 511; i >= 0; i--)
	278	n += sprintf(buf + n, "%02x", ext_csd[i]);
	279	n += sprintf(buf + n, "\n");
	280	BUG_ON(n != EXT_CSD_STR_LEN);
	281
	282	filp->private_data = buf;
	283	kfree(ext_csd);
	284	return 0;
	285
	286	out_free:
	287	kfree(buf);
	288	kfree(ext_csd);
	289	return err;
	290	}
	291
	292	static ssize_t mmc_ext_csd_read(struct file filp, char __user ubuf,
	293	size_t cnt, loff_t *ppos)
	294	{
	295	char *buf = filp->private_data;
	296
	297	return simple_read_from_buffer(ubuf, cnt, ppos,
	298	buf, EXT_CSD_STR_LEN);
	299	}
	300
	301	static int mmc_ext_csd_release(struct inode inode, struct file file)
	302	{
	303	kfree(file->private_data);
	304	return 0;
	305	}
	306
828c0950	307	static const struct file_operations mmc_dbg_ext_csd_fops = {
736bb6bb AH	308	.open = mmc_ext_csd_open,
	309	.read = mmc_ext_csd_read,
	310	.release = mmc_ext_csd_release,
6038f373	311	.llseek = default_llseek,
736bb6bb AH	312	};
736bb6bb AH	313
f4b7f927 HS	314	void mmc_add_card_debugfs(struct mmc_card *card)
	315	{
	316	struct mmc_host *host = card->host;
	317	struct dentry *root;
	318
	319	if (!host->debugfs_root)
	320	return;
	321
	322	root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
	323	if (IS_ERR(root))
	324	/* Don't complain -- debugfs just isn't enabled */
	325	return;
	326	if (!root)
	327	/* Complain -- debugfs is enabled, but it failed to
	328	* create the directory. */
	329	goto err;
	330
	331	card->debugfs_root = root;
	332
	333	if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
	334	goto err;
	335
	336	if (mmc_card_mmc(card) \|\| mmc_card_sd(card))
	337	if (!debugfs_create_file("status", S_IRUSR, root, card,
	338	&mmc_dbg_card_status_fops))
	339	goto err;
	340
736bb6bb AH	341	if (mmc_card_mmc(card))
	342	if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
	343	&mmc_dbg_ext_csd_fops))
	344	goto err;
	345
f4b7f927 HS	346	return;
	347
	348	err:
	349	debugfs_remove_recursive(root);
	350	card->debugfs_root = NULL;
	351	dev_err(&card->dev, "failed to initialize debugfs\n");
	352	}
	353
	354	void mmc_remove_card_debugfs(struct mmc_card *card)
	355	{
	356	debugfs_remove_recursive(card->debugfs_root);
	357	}