/**
 * debugfs.c - DesignWare USB3 DRD Controller DebugFS file
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
 * All rights reserved.
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the above-listed copyright holders may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2, as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR
 * CONTRIBUTORS 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/kernel.h>
#include <linux/slab.h>
#include <linux/ptrace.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/delay.h>

#include <asm/uaccess.h>

#include "core.h"
#include "gadget.h"
#include "io.h"

struct dwc3_register {
	const char	*name;
	u32		offset;
};

#define dump_register(nm)				\
{							\
	.name	= __stringify(nm),			\
	.offset	= DWC3_ ##nm,				\
}

static const struct dwc3_register dwc3_regs[] = {
	dump_register(GSBUSCFG0),
	dump_register(GSBUSCFG1),
	dump_register(GTXTHRCFG),
	dump_register(GRXTHRCFG),
	dump_register(GCTL),
	dump_register(GEVTEN),
	dump_register(GSTS),
	dump_register(GSNPSID),
	dump_register(GGPIO),
	dump_register(GUID),
	dump_register(GUCTL),
	dump_register(GBUSERRADDR0),
	dump_register(GBUSERRADDR1),
	dump_register(GPRTBIMAP0),
	dump_register(GPRTBIMAP1),
	dump_register(GHWPARAMS0),
	dump_register(GHWPARAMS1),
	dump_register(GHWPARAMS2),
	dump_register(GHWPARAMS3),
	dump_register(GHWPARAMS4),
	dump_register(GHWPARAMS5),
	dump_register(GHWPARAMS6),
	dump_register(GHWPARAMS7),
	dump_register(GDBGFIFOSPACE),
	dump_register(GDBGLTSSM),
	dump_register(GPRTBIMAP_HS0),
	dump_register(GPRTBIMAP_HS1),
	dump_register(GPRTBIMAP_FS0),
	dump_register(GPRTBIMAP_FS1),

	dump_register(GUSB2PHYCFG(0)),
	dump_register(GUSB2PHYCFG(1)),
	dump_register(GUSB2PHYCFG(2)),
	dump_register(GUSB2PHYCFG(3)),
	dump_register(GUSB2PHYCFG(4)),
	dump_register(GUSB2PHYCFG(5)),
	dump_register(GUSB2PHYCFG(6)),
	dump_register(GUSB2PHYCFG(7)),
	dump_register(GUSB2PHYCFG(8)),
	dump_register(GUSB2PHYCFG(9)),
	dump_register(GUSB2PHYCFG(10)),
	dump_register(GUSB2PHYCFG(11)),
	dump_register(GUSB2PHYCFG(12)),
	dump_register(GUSB2PHYCFG(13)),
	dump_register(GUSB2PHYCFG(14)),
	dump_register(GUSB2PHYCFG(15)),

	dump_register(GUSB2I2CCTL(0)),
	dump_register(GUSB2I2CCTL(1)),
	dump_register(GUSB2I2CCTL(2)),
	dump_register(GUSB2I2CCTL(3)),
	dump_register(GUSB2I2CCTL(4)),
	dump_register(GUSB2I2CCTL(5)),
	dump_register(GUSB2I2CCTL(6)),
	dump_register(GUSB2I2CCTL(7)),
	dump_register(GUSB2I2CCTL(8)),
	dump_register(GUSB2I2CCTL(9)),
	dump_register(GUSB2I2CCTL(10)),
	dump_register(GUSB2I2CCTL(11)),
	dump_register(GUSB2I2CCTL(12)),
	dump_register(GUSB2I2CCTL(13)),
	dump_register(GUSB2I2CCTL(14)),
	dump_register(GUSB2I2CCTL(15)),

	dump_register(GUSB2PHYACC(0)),
	dump_register(GUSB2PHYACC(1)),
	dump_register(GUSB2PHYACC(2)),
	dump_register(GUSB2PHYACC(3)),
	dump_register(GUSB2PHYACC(4)),
	dump_register(GUSB2PHYACC(5)),
	dump_register(GUSB2PHYACC(6)),
	dump_register(GUSB2PHYACC(7)),
	dump_register(GUSB2PHYACC(8)),
	dump_register(GUSB2PHYACC(9)),
	dump_register(GUSB2PHYACC(10)),
	dump_register(GUSB2PHYACC(11)),
	dump_register(GUSB2PHYACC(12)),
	dump_register(GUSB2PHYACC(13)),
	dump_register(GUSB2PHYACC(14)),
	dump_register(GUSB2PHYACC(15)),

	dump_register(GUSB3PIPECTL(0)),
	dump_register(GUSB3PIPECTL(1)),
	dump_register(GUSB3PIPECTL(2)),
	dump_register(GUSB3PIPECTL(3)),
	dump_register(GUSB3PIPECTL(4)),
	dump_register(GUSB3PIPECTL(5)),
	dump_register(GUSB3PIPECTL(6)),
	dump_register(GUSB3PIPECTL(7)),
	dump_register(GUSB3PIPECTL(8)),
	dump_register(GUSB3PIPECTL(9)),
	dump_register(GUSB3PIPECTL(10)),
	dump_register(GUSB3PIPECTL(11)),
	dump_register(GUSB3PIPECTL(12)),
	dump_register(GUSB3PIPECTL(13)),
	dump_register(GUSB3PIPECTL(14)),
	dump_register(GUSB3PIPECTL(15)),

	dump_register(GTXFIFOSIZ(0)),
	dump_register(GTXFIFOSIZ(1)),
	dump_register(GTXFIFOSIZ(2)),
	dump_register(GTXFIFOSIZ(3)),
	dump_register(GTXFIFOSIZ(4)),
	dump_register(GTXFIFOSIZ(5)),
	dump_register(GTXFIFOSIZ(6)),
	dump_register(GTXFIFOSIZ(7)),
	dump_register(GTXFIFOSIZ(8)),
	dump_register(GTXFIFOSIZ(9)),
	dump_register(GTXFIFOSIZ(10)),
	dump_register(GTXFIFOSIZ(11)),
	dump_register(GTXFIFOSIZ(12)),
	dump_register(GTXFIFOSIZ(13)),
	dump_register(GTXFIFOSIZ(14)),
	dump_register(GTXFIFOSIZ(15)),
	dump_register(GTXFIFOSIZ(16)),
	dump_register(GTXFIFOSIZ(17)),
	dump_register(GTXFIFOSIZ(18)),
	dump_register(GTXFIFOSIZ(19)),
	dump_register(GTXFIFOSIZ(20)),
	dump_register(GTXFIFOSIZ(21)),
	dump_register(GTXFIFOSIZ(22)),
	dump_register(GTXFIFOSIZ(23)),
	dump_register(GTXFIFOSIZ(24)),
	dump_register(GTXFIFOSIZ(25)),
	dump_register(GTXFIFOSIZ(26)),
	dump_register(GTXFIFOSIZ(27)),
	dump_register(GTXFIFOSIZ(28)),
	dump_register(GTXFIFOSIZ(29)),
	dump_register(GTXFIFOSIZ(30)),
	dump_register(GTXFIFOSIZ(31)),

	dump_register(GRXFIFOSIZ(0)),
	dump_register(GRXFIFOSIZ(1)),
	dump_register(GRXFIFOSIZ(2)),
	dump_register(GRXFIFOSIZ(3)),
	dump_register(GRXFIFOSIZ(4)),
	dump_register(GRXFIFOSIZ(5)),
	dump_register(GRXFIFOSIZ(6)),
	dump_register(GRXFIFOSIZ(7)),
	dump_register(GRXFIFOSIZ(8)),
	dump_register(GRXFIFOSIZ(9)),
	dump_register(GRXFIFOSIZ(10)),
	dump_register(GRXFIFOSIZ(11)),
	dump_register(GRXFIFOSIZ(12)),
	dump_register(GRXFIFOSIZ(13)),
	dump_register(GRXFIFOSIZ(14)),
	dump_register(GRXFIFOSIZ(15)),
	dump_register(GRXFIFOSIZ(16)),
	dump_register(GRXFIFOSIZ(17)),
	dump_register(GRXFIFOSIZ(18)),
	dump_register(GRXFIFOSIZ(19)),
	dump_register(GRXFIFOSIZ(20)),
	dump_register(GRXFIFOSIZ(21)),
	dump_register(GRXFIFOSIZ(22)),
	dump_register(GRXFIFOSIZ(23)),
	dump_register(GRXFIFOSIZ(24)),
	dump_register(GRXFIFOSIZ(25)),
	dump_register(GRXFIFOSIZ(26)),
	dump_register(GRXFIFOSIZ(27)),
	dump_register(GRXFIFOSIZ(28)),
	dump_register(GRXFIFOSIZ(29)),
	dump_register(GRXFIFOSIZ(30)),
	dump_register(GRXFIFOSIZ(31)),

	dump_register(GEVNTADRLO(0)),
	dump_register(GEVNTADRHI(0)),
	dump_register(GEVNTSIZ(0)),
	dump_register(GEVNTCOUNT(0)),

	dump_register(GHWPARAMS8),
	dump_register(DCFG),
	dump_register(DCTL),
	dump_register(DEVTEN),
	dump_register(DSTS),
	dump_register(DGCMDPAR),
	dump_register(DGCMD),
	dump_register(DALEPENA),

	dump_register(DEPCMDPAR2(0)),
	dump_register(DEPCMDPAR2(1)),
	dump_register(DEPCMDPAR2(2)),
	dump_register(DEPCMDPAR2(3)),
	dump_register(DEPCMDPAR2(4)),
	dump_register(DEPCMDPAR2(5)),
	dump_register(DEPCMDPAR2(6)),
	dump_register(DEPCMDPAR2(7)),
	dump_register(DEPCMDPAR2(8)),
	dump_register(DEPCMDPAR2(9)),
	dump_register(DEPCMDPAR2(10)),
	dump_register(DEPCMDPAR2(11)),
	dump_register(DEPCMDPAR2(12)),
	dump_register(DEPCMDPAR2(13)),
	dump_register(DEPCMDPAR2(14)),
	dump_register(DEPCMDPAR2(15)),
	dump_register(DEPCMDPAR2(16)),
	dump_register(DEPCMDPAR2(17)),
	dump_register(DEPCMDPAR2(18)),
	dump_register(DEPCMDPAR2(19)),
	dump_register(DEPCMDPAR2(20)),
	dump_register(DEPCMDPAR2(21)),
	dump_register(DEPCMDPAR2(22)),
	dump_register(DEPCMDPAR2(23)),
	dump_register(DEPCMDPAR2(24)),
	dump_register(DEPCMDPAR2(25)),
	dump_register(DEPCMDPAR2(26)),
	dump_register(DEPCMDPAR2(27)),
	dump_register(DEPCMDPAR2(28)),
	dump_register(DEPCMDPAR2(29)),
	dump_register(DEPCMDPAR2(30)),
	dump_register(DEPCMDPAR2(31)),

	dump_register(DEPCMDPAR1(0)),
	dump_register(DEPCMDPAR1(1)),
	dump_register(DEPCMDPAR1(2)),
	dump_register(DEPCMDPAR1(3)),
	dump_register(DEPCMDPAR1(4)),
	dump_register(DEPCMDPAR1(5)),
	dump_register(DEPCMDPAR1(6)),
	dump_register(DEPCMDPAR1(7)),
	dump_register(DEPCMDPAR1(8)),
	dump_register(DEPCMDPAR1(9)),
	dump_register(DEPCMDPAR1(10)),
	dump_register(DEPCMDPAR1(11)),
	dump_register(DEPCMDPAR1(12)),
	dump_register(DEPCMDPAR1(13)),
	dump_register(DEPCMDPAR1(14)),
	dump_register(DEPCMDPAR1(15)),
	dump_register(DEPCMDPAR1(16)),
	dump_register(DEPCMDPAR1(17)),
	dump_register(DEPCMDPAR1(18)),
	dump_register(DEPCMDPAR1(19)),
	dump_register(DEPCMDPAR1(20)),
	dump_register(DEPCMDPAR1(21)),
	dump_register(DEPCMDPAR1(22)),
	dump_register(DEPCMDPAR1(23)),
	dump_register(DEPCMDPAR1(24)),
	dump_register(DEPCMDPAR1(25)),
	dump_register(DEPCMDPAR1(26)),
	dump_register(DEPCMDPAR1(27)),
	dump_register(DEPCMDPAR1(28)),
	dump_register(DEPCMDPAR1(29)),
	dump_register(DEPCMDPAR1(30)),
	dump_register(DEPCMDPAR1(31)),

	dump_register(DEPCMDPAR0(0)),
	dump_register(DEPCMDPAR0(1)),
	dump_register(DEPCMDPAR0(2)),
	dump_register(DEPCMDPAR0(3)),
	dump_register(DEPCMDPAR0(4)),
	dump_register(DEPCMDPAR0(5)),
	dump_register(DEPCMDPAR0(6)),
	dump_register(DEPCMDPAR0(7)),
	dump_register(DEPCMDPAR0(8)),
	dump_register(DEPCMDPAR0(9)),
	dump_register(DEPCMDPAR0(10)),
	dump_register(DEPCMDPAR0(11)),
	dump_register(DEPCMDPAR0(12)),
	dump_register(DEPCMDPAR0(13)),
	dump_register(DEPCMDPAR0(14)),
	dump_register(DEPCMDPAR0(15)),
	dump_register(DEPCMDPAR0(16)),
	dump_register(DEPCMDPAR0(17)),
	dump_register(DEPCMDPAR0(18)),
	dump_register(DEPCMDPAR0(19)),
	dump_register(DEPCMDPAR0(20)),
	dump_register(DEPCMDPAR0(21)),
	dump_register(DEPCMDPAR0(22)),
	dump_register(DEPCMDPAR0(23)),
	dump_register(DEPCMDPAR0(24)),
	dump_register(DEPCMDPAR0(25)),
	dump_register(DEPCMDPAR0(26)),
	dump_register(DEPCMDPAR0(27)),
	dump_register(DEPCMDPAR0(28)),
	dump_register(DEPCMDPAR0(29)),
	dump_register(DEPCMDPAR0(30)),
	dump_register(DEPCMDPAR0(31)),

	dump_register(DEPCMD(0)),
	dump_register(DEPCMD(1)),
	dump_register(DEPCMD(2)),
	dump_register(DEPCMD(3)),
	dump_register(DEPCMD(4)),
	dump_register(DEPCMD(5)),
	dump_register(DEPCMD(6)),
	dump_register(DEPCMD(7)),
	dump_register(DEPCMD(8)),
	dump_register(DEPCMD(9)),
	dump_register(DEPCMD(10)),
	dump_register(DEPCMD(11)),
	dump_register(DEPCMD(12)),
	dump_register(DEPCMD(13)),
	dump_register(DEPCMD(14)),
	dump_register(DEPCMD(15)),
	dump_register(DEPCMD(16)),
	dump_register(DEPCMD(17)),
	dump_register(DEPCMD(18)),
	dump_register(DEPCMD(19)),
	dump_register(DEPCMD(20)),
	dump_register(DEPCMD(21)),
	dump_register(DEPCMD(22)),
	dump_register(DEPCMD(23)),
	dump_register(DEPCMD(24)),
	dump_register(DEPCMD(25)),
	dump_register(DEPCMD(26)),
	dump_register(DEPCMD(27)),
	dump_register(DEPCMD(28)),
	dump_register(DEPCMD(29)),
	dump_register(DEPCMD(30)),
	dump_register(DEPCMD(31)),

	dump_register(OCFG),
	dump_register(OCTL),
	dump_register(OEVTEN),
	dump_register(OSTS),
};

static int dwc3_regdump_show(struct seq_file *s, void *unused)
{
	struct dwc3		*dwc = s->private;
	int			i;

	seq_printf(s, "DesignWare USB3 Core Register Dump\n");

	for (i = 0; i < ARRAY_SIZE(dwc3_regs); i++) {
		seq_printf(s, "%-20s :    %08x\n", dwc3_regs[i].name,
				dwc3_readl(dwc->regs, dwc3_regs[i].offset));
	}

	return 0;
}

static int dwc3_regdump_open(struct inode *inode, struct file *file)
{
	return single_open(file, dwc3_regdump_show, inode->i_private);
}

static const struct file_operations dwc3_regdump_fops = {
	.open			= dwc3_regdump_open,
	.read			= seq_read,
	.release		= single_release,
};


static int dwc3_send_testmode_cmd(struct dwc3 *dwc, int mode)
{
	u32 timeout = 250;

	dwc3_writel(dwc->regs, DWC3_DGCMDPAR, mode);
	dwc3_writel(dwc->regs, DWC3_DGCMD, DWC3_DGCMD_RUN_SOC_BUS_LOOPBACK |
			DWC3_DEPCMD_CMDACT);
	do {
		u32 reg;

		reg = dwc3_readl(dwc->regs, DWC3_DGCMD);
		if (!(reg & DWC3_DEPCMD_CMDACT))
			return 0;
		timeout--;
		if (!timeout)
			return -ETIMEDOUT;
		mdelay(1);
	} while (1);
}

static struct dwc3_trb_hw trb_0 __aligned(16);
static struct dwc3_trb_hw trb_1 __aligned(16);

#define BUF_SIZE	4096
static int dwc3_testmode_open(struct inode *inode, struct file *file)
{
	struct dwc3 *dwc = inode->i_private;
	struct dwc3_gadget_ep_cmd_params par0;
	struct dwc3_gadget_ep_cmd_params par1;
	struct dwc3_trb         trb;
	int ret;
	u8 *buf0;
	u8 *buf1;

	buf0 = kmalloc(BUF_SIZE, GFP_KERNEL);
	if (!buf0)
		return -ENOMEM;
	buf1 = kmalloc(BUF_SIZE, GFP_KERNEL);
	if (!buf1)
		return -ENOMEM;

	memset(buf0, 0xaa, BUF_SIZE);
	memset(buf1, 0x33, BUF_SIZE);

	memset(&trb, 0, sizeof(trb));
	memset(&par0, 0, sizeof(par0));
	memset(&par1, 0, sizeof(par1));

	trb.lst = 1;
	trb.trbctl = DWC3_TRBCTL_NORMAL;
	trb.length = BUF_SIZE;
	trb.hwo = 1;

	trb.bplh = virt_to_phys(buf0);
	dwc3_trb_to_hw(&trb, &trb_0);

	trb.bplh = virt_to_phys(buf1);
	dwc3_trb_to_hw(&trb, &trb_1);

	par0.param0.depstrtxfer.transfer_desc_addr_high =
		upper_32_bits(virt_to_phys(&trb_0));
	par0.param1.depstrtxfer.transfer_desc_addr_low =
		lower_32_bits(virt_to_phys(&trb_0));

	par1.param0.depstrtxfer.transfer_desc_addr_high =
		upper_32_bits(virt_to_phys(&trb_1));
	par1.param1.depstrtxfer.transfer_desc_addr_low =
		lower_32_bits(virt_to_phys(&trb_1));

	dwc3_send_testmode_cmd(dwc, 1);

	ret = dwc3_send_gadget_ep_cmd(dwc, 0, DWC3_DEPCMD_STARTTRANSFER, &par0);
	ret = dwc3_send_gadget_ep_cmd(dwc, 1, DWC3_DEPCMD_STARTTRANSFER, &par1);

	dwc3_send_testmode_cmd(dwc, 0);
	return -EBUSY;
}

static const struct file_operations dwc3_testmode_fops = {
	.open			= dwc3_testmode_open,
	.read			= seq_read,
	.release		= single_release,
};

int __devinit dwc3_debugfs_init(struct dwc3 *dwc)
{
	struct dentry		*root;
	struct dentry		*file;
	int			ret;

	root = debugfs_create_dir(dev_name(dwc->dev), NULL);
	if (IS_ERR(root)){
		ret = PTR_ERR(root);
		goto err0;
	}

	dwc->root = root;

	file = debugfs_create_file("regdump", S_IRUGO, root, dwc,
			&dwc3_regdump_fops);
	if (IS_ERR(file)) {
		ret = PTR_ERR(file);
		goto err1;
	}
	file = debugfs_create_file("testmode", S_IRUGO, root, dwc,
			&dwc3_testmode_fops);
	if (IS_ERR(file)) {
		ret = PTR_ERR(file);
		goto err1;
	}

	return 0;

err1:
	debugfs_remove_recursive(root);

err0:
	return ret;
}

void __devexit dwc3_debugfs_exit(struct dwc3 *dwc)
{
	debugfs_remove_recursive(dwc->root);
	dwc->root = NULL;
}