/*
 * MUSB OTG driver debugfs support
 *
 * Copyright 2010 Nokia Corporation
 * Contact: Felipe Balbi <felipe.balbi@nokia.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>

#include <asm/uaccess.h>

#include "musb_core.h"
#include "musb_debug.h"

struct musb_register_map {
	char			*name;
	unsigned		offset;
	unsigned		size;
};

static const struct musb_register_map musb_regmap[] = {
	{ "FAddr",		0x00,	8 },
	{ "Power",		0x01,	8 },
	{ "Frame",		0x0c,	16 },
	{ "Index",		0x0e,	8 },
	{ "Testmode",		0x0f,	8 },
	{ "TxMaxPp",		0x10,	16 },
	{ "TxCSRp",		0x12,	16 },
	{ "RxMaxPp",		0x14,	16 },
	{ "RxCSR",		0x16,	16 },
	{ "RxCount",		0x18,	16 },
	{ "ConfigData",		0x1f,	8 },
	{ "DevCtl",		0x60,	8 },
	{ "MISC",		0x61,	8 },
	{ "TxFIFOsz",		0x62,	8 },
	{ "RxFIFOsz",		0x63,	8 },
	{ "TxFIFOadd",		0x64,	16 },
	{ "RxFIFOadd",		0x66,	16 },
	{ "VControl",		0x68,	32 },
	{ "HWVers",		0x6C,	16 },
	{ "EPInfo",		0x78,	8 },
	{ "RAMInfo",		0x79,	8 },
	{ "LinkInfo",		0x7A,	8 },
	{ "VPLen",		0x7B,	8 },
	{ "HS_EOF1",		0x7C,	8 },
	{ "FS_EOF1",		0x7D,	8 },
	{ "LS_EOF1",		0x7E,	8 },
	{ "SOFT_RST",		0x7F,	8 },
	{ "DMA_CNTLch0",	0x204,	16 },
	{ "DMA_ADDRch0",	0x208,	32 },
	{ "DMA_COUNTch0",	0x20C,	32 },
	{ "DMA_CNTLch1",	0x214,	16 },
	{ "DMA_ADDRch1",	0x218,	32 },
	{ "DMA_COUNTch1",	0x21C,	32 },
	{ "DMA_CNTLch2",	0x224,	16 },
	{ "DMA_ADDRch2",	0x228,	32 },
	{ "DMA_COUNTch2",	0x22C,	32 },
	{ "DMA_CNTLch3",	0x234,	16 },
	{ "DMA_ADDRch3",	0x238,	32 },
	{ "DMA_COUNTch3",	0x23C,	32 },
	{ "DMA_CNTLch4",	0x244,	16 },
	{ "DMA_ADDRch4",	0x248,	32 },
	{ "DMA_COUNTch4",	0x24C,	32 },
	{ "DMA_CNTLch5",	0x254,	16 },
	{ "DMA_ADDRch5",	0x258,	32 },
	{ "DMA_COUNTch5",	0x25C,	32 },
	{ "DMA_CNTLch6",	0x264,	16 },
	{ "DMA_ADDRch6",	0x268,	32 },
	{ "DMA_COUNTch6",	0x26C,	32 },
	{ "DMA_CNTLch7",	0x274,	16 },
	{ "DMA_ADDRch7",	0x278,	32 },
	{ "DMA_COUNTch7",	0x27C,	32 },
	{  }	/* Terminating Entry */
};

static struct dentry *musb_debugfs_root;

static int musb_regdump_show(struct seq_file *s, void *unused)
{
	struct musb		*musb = s->private;
	unsigned		i;

	seq_printf(s, "MUSB (M)HDRC Register Dump\n");

	for (i = 0; i < ARRAY_SIZE(musb_regmap); i++) {
		switch (musb_regmap[i].size) {
		case 8:
			seq_printf(s, "%-12s: %02x\n", musb_regmap[i].name,
					musb_readb(musb->mregs, musb_regmap[i].offset));
			break;
		case 16:
			seq_printf(s, "%-12s: %04x\n", musb_regmap[i].name,
					musb_readw(musb->mregs, musb_regmap[i].offset));
			break;
		case 32:
			seq_printf(s, "%-12s: %08x\n", musb_regmap[i].name,
					musb_readl(musb->mregs, musb_regmap[i].offset));
			break;
		}
	}

	return 0;
}

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

static int musb_test_mode_show(struct seq_file *s, void *unused)
{
	struct musb		*musb = s->private;
	unsigned		test;

	test = musb_readb(musb->mregs, MUSB_TESTMODE);

	if (test & MUSB_TEST_FORCE_HOST)
		seq_printf(s, "force host\n");

	if (test & MUSB_TEST_FIFO_ACCESS)
		seq_printf(s, "fifo access\n");

	if (test & MUSB_TEST_FORCE_FS)
		seq_printf(s, "force full-speed\n");

	if (test & MUSB_TEST_FORCE_HS)
		seq_printf(s, "force high-speed\n");

	if (test & MUSB_TEST_PACKET)
		seq_printf(s, "test packet\n");

	if (test & MUSB_TEST_K)
		seq_printf(s, "test K\n");

	if (test & MUSB_TEST_J)
		seq_printf(s, "test J\n");

	if (test & MUSB_TEST_SE0_NAK)
		seq_printf(s, "test SE0 NAK\n");

	return 0;
}

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

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

static ssize_t musb_test_mode_write(struct file *file,
		const char __user *ubuf, size_t count, loff_t *ppos)
{
	struct seq_file		*s = file->private_data;
	struct musb		*musb = s->private;
	u8			test = 0;
	char			buf[18];

	memset(buf, 0x00, sizeof(buf));

	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
		return -EFAULT;

	if (!strncmp(buf, "force host", 9))
		test = MUSB_TEST_FORCE_HOST;

	if (!strncmp(buf, "fifo access", 11))
		test = MUSB_TEST_FIFO_ACCESS;

	if (!strncmp(buf, "force full-speed", 15))
		test = MUSB_TEST_FORCE_FS;

	if (!strncmp(buf, "force high-speed", 15))
		test = MUSB_TEST_FORCE_HS;

	if (!strncmp(buf, "test packet", 10)) {
		test = MUSB_TEST_PACKET;
		musb_load_testpacket(musb);
	}

	if (!strncmp(buf, "test K", 6))
		test = MUSB_TEST_K;

	if (!strncmp(buf, "test J", 6))
		test = MUSB_TEST_J;

	if (!strncmp(buf, "test SE0 NAK", 12))
		test = MUSB_TEST_SE0_NAK;

	musb_writeb(musb->mregs, MUSB_TESTMODE, test);

	return count;
}

static const struct file_operations musb_test_mode_fops = {
	.open			= musb_test_mode_open,
	.write			= musb_test_mode_write,
	.read			= seq_read,
	.llseek			= seq_lseek,
	.release		= single_release,
};

int __init musb_init_debugfs(struct musb *musb)
{
	struct dentry		*root;
	struct dentry		*file;
	int			ret;

	root = debugfs_create_dir("musb", NULL);
	if (IS_ERR(root)) {
		ret = PTR_ERR(root);
		goto err0;
	}

	file = debugfs_create_file("regdump", S_IRUGO, root, musb,
			&musb_regdump_fops);
	if (IS_ERR(file)) {
		ret = PTR_ERR(file);
		goto err1;
	}

	file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR,
			root, musb, &musb_test_mode_fops);
	if (IS_ERR(file)) {
		ret = PTR_ERR(file);
		goto err1;
	}

	musb_debugfs_root = root;

	return 0;

err1:
	debugfs_remove_recursive(root);

err0:
	return ret;
}

void /* __init_or_exit */ musb_exit_debugfs(struct musb *musb)
{
	debugfs_remove_recursive(musb_debugfs_root);
}