kernel_google_redbull/drivers/usb/dwc3/debugfs.c

// SPDX-License-Identifier: GPL-2.0
/**
 * debugfs.c - DesignWare USB3 DRD Controller DebugFS file
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 */

#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 <linux/uaccess.h>

#include <linux/usb/ch9.h>

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

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

#define dump_ep_register_set(n)			\
	{					\
		.name = "DEPCMDPAR2("__stringify(n)")",	\
		.offset = DWC3_DEP_BASE(n) +	\
			DWC3_DEPCMDPAR2,	\
	},					\
	{					\
		.name = "DEPCMDPAR1("__stringify(n)")",	\
		.offset = DWC3_DEP_BASE(n) +	\
			DWC3_DEPCMDPAR1,	\
	},					\
	{					\
		.name = "DEPCMDPAR0("__stringify(n)")",	\
		.offset = DWC3_DEP_BASE(n) +	\
			DWC3_DEPCMDPAR0,	\
	},					\
	{					\
		.name = "DEPCMD("__stringify(n)")",	\
		.offset = DWC3_DEP_BASE(n) +	\
			DWC3_DEPCMD,		\
	}


#define ep_event_rate(ev, c, p, dt)	\
	((dt) ? ((c.ev - p.ev) * (MSEC_PER_SEC)) / (dt) : 0)

static const struct debugfs_reg32 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(GUCTL1),
	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(GDBGBMU),
	dump_register(GDBGLSPMUX),
	dump_register(GDBGLSP),
	dump_register(GDBGEPINFO0),
	dump_register(GDBGEPINFO1),
	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_ep_register_set(0),
	dump_ep_register_set(1),
	dump_ep_register_set(2),
	dump_ep_register_set(3),
	dump_ep_register_set(4),
	dump_ep_register_set(5),
	dump_ep_register_set(6),
	dump_ep_register_set(7),
	dump_ep_register_set(8),
	dump_ep_register_set(9),
	dump_ep_register_set(10),
	dump_ep_register_set(11),
	dump_ep_register_set(12),
	dump_ep_register_set(13),
	dump_ep_register_set(14),
	dump_ep_register_set(15),
	dump_ep_register_set(16),
	dump_ep_register_set(17),
	dump_ep_register_set(18),
	dump_ep_register_set(19),
	dump_ep_register_set(20),
	dump_ep_register_set(21),
	dump_ep_register_set(22),
	dump_ep_register_set(23),
	dump_ep_register_set(24),
	dump_ep_register_set(25),
	dump_ep_register_set(26),
	dump_ep_register_set(27),
	dump_ep_register_set(28),
	dump_ep_register_set(29),
	dump_ep_register_set(30),
	dump_ep_register_set(31),

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

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

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	debugfs_print_regs32(s, dwc->regset->regs, dwc->regset->nregs,
				dwc->regset->base, "");
	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,
	.llseek			= seq_lseek,
	.release		= single_release,
};

static int dwc3_mode_show(struct seq_file *s, void *unused)
{
	struct dwc3		*dwc = s->private;
	unsigned long		flags;
	u32			reg;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
	spin_unlock_irqrestore(&dwc->lock, flags);

	switch (DWC3_GCTL_PRTCAP(reg)) {
	case DWC3_GCTL_PRTCAP_HOST:
		seq_printf(s, "host\n");
		break;
	case DWC3_GCTL_PRTCAP_DEVICE:
		seq_printf(s, "device\n");
		break;
	case DWC3_GCTL_PRTCAP_OTG:
		seq_printf(s, "otg\n");
		break;
	default:
		seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
	}

	return 0;
}

static int dwc3_mode_open(struct inode *inode, struct file *file)
{
	return single_open(file, dwc3_mode_show, inode->i_private);
}

static ssize_t dwc3_mode_write(struct file *file,
		const char __user *ubuf, size_t count, loff_t *ppos)
{
	struct seq_file		*s = file->private_data;
	struct dwc3		*dwc = s->private;
	u32			mode = 0;
	char			buf[32] = {};

	if (atomic_read(&dwc->in_lpm)) {
		dev_err(dwc->dev, "USB device is powered off\n");
		return count;
	}

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

	if (!strncmp(buf, "host", 4))
		mode = DWC3_GCTL_PRTCAP_HOST;

	if (!strncmp(buf, "device", 6))
		mode = DWC3_GCTL_PRTCAP_DEVICE;

	if (!strncmp(buf, "otg", 3))
		mode = DWC3_GCTL_PRTCAP_OTG;

	dwc3_set_mode(dwc, mode);

	return count;
}

static const struct file_operations dwc3_mode_fops = {
	.open			= dwc3_mode_open,
	.write			= dwc3_mode_write,
	.read			= seq_read,
	.llseek			= seq_lseek,
	.release		= single_release,
};

static int dwc3_testmode_show(struct seq_file *s, void *unused)
{
	struct dwc3		*dwc = s->private;
	unsigned long		flags;
	u32			reg;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
	reg &= DWC3_DCTL_TSTCTRL_MASK;
	reg >>= 1;
	spin_unlock_irqrestore(&dwc->lock, flags);

	switch (reg) {
	case 0:
		seq_printf(s, "no test\n");
		break;
	case TEST_J:
		seq_printf(s, "test_j\n");
		break;
	case TEST_K:
		seq_printf(s, "test_k\n");
		break;
	case TEST_SE0_NAK:
		seq_printf(s, "test_se0_nak\n");
		break;
	case TEST_PACKET:
		seq_printf(s, "test_packet\n");
		break;
	case TEST_FORCE_EN:
		seq_printf(s, "test_force_enable\n");
		break;
	default:
		seq_printf(s, "UNKNOWN %d\n", reg);
	}

	return 0;
}

static int dwc3_testmode_open(struct inode *inode, struct file *file)
{
	return single_open(file, dwc3_testmode_show, inode->i_private);
}

static ssize_t dwc3_testmode_write(struct file *file,
		const char __user *ubuf, size_t count, loff_t *ppos)
{
	struct seq_file		*s = file->private_data;
	struct dwc3		*dwc = s->private;
	unsigned long		flags;
	u32			testmode = 0;
	char			buf[32] = {};

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

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

	if (!strncmp(buf, "test_j", 6))
		testmode = TEST_J;
	else if (!strncmp(buf, "test_k", 6))
		testmode = TEST_K;
	else if (!strncmp(buf, "test_se0_nak", 12))
		testmode = TEST_SE0_NAK;
	else if (!strncmp(buf, "test_packet", 11))
		testmode = TEST_PACKET;
	else if (!strncmp(buf, "test_force_enable", 17))
		testmode = TEST_FORCE_EN;
	else
		testmode = 0;

	spin_lock_irqsave(&dwc->lock, flags);
	dwc3_gadget_set_test_mode(dwc, testmode);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return count;
}

static const struct file_operations dwc3_testmode_fops = {
	.open			= dwc3_testmode_open,
	.write			= dwc3_testmode_write,
	.read			= seq_read,
	.llseek			= seq_lseek,
	.release		= single_release,
};

static int dwc3_link_state_show(struct seq_file *s, void *unused)
{
	struct dwc3		*dwc = s->private;
	unsigned long		flags;
	enum dwc3_link_state	state;
	u32			reg;
	u8			speed;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
	state = DWC3_DSTS_USBLNKST(reg);
	speed = reg & DWC3_DSTS_CONNECTSPD;

	seq_printf(s, "%s\n", (speed >= DWC3_DSTS_SUPERSPEED) ?
		   dwc3_gadget_link_string(state) :
		   dwc3_gadget_hs_link_string(state));
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_link_state_open(struct inode *inode, struct file *file)
{
	return single_open(file, dwc3_link_state_show, inode->i_private);
}

static ssize_t dwc3_link_state_write(struct file *file,
		const char __user *ubuf, size_t count, loff_t *ppos)
{
	struct seq_file		*s = file->private_data;
	struct dwc3		*dwc = s->private;
	unsigned long		flags;
	enum dwc3_link_state	state = 0;
	char			buf[32] = {};
	u32			reg;
	u8			speed;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

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

	if (!strncmp(buf, "SS.Disabled", 11))
		state = DWC3_LINK_STATE_SS_DIS;
	else if (!strncmp(buf, "Rx.Detect", 9))
		state = DWC3_LINK_STATE_RX_DET;
	else if (!strncmp(buf, "SS.Inactive", 11))
		state = DWC3_LINK_STATE_SS_INACT;
	else if (!strncmp(buf, "Recovery", 8))
		state = DWC3_LINK_STATE_RECOV;
	else if (!strncmp(buf, "Compliance", 10))
		state = DWC3_LINK_STATE_CMPLY;
	else if (!strncmp(buf, "Loopback", 8))
		state = DWC3_LINK_STATE_LPBK;
	else
		return -EINVAL;

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
	speed = reg & DWC3_DSTS_CONNECTSPD;

	if (speed < DWC3_DSTS_SUPERSPEED &&
	    state != DWC3_LINK_STATE_RECOV) {
		spin_unlock_irqrestore(&dwc->lock, flags);
		return -EINVAL;
	}

	dwc3_gadget_set_link_state(dwc, state);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return count;
}

static const struct file_operations dwc3_link_state_fops = {
	.open			= dwc3_link_state_open,
	.write			= dwc3_link_state_write,
	.read			= seq_read,
	.llseek			= seq_lseek,
	.release		= single_release,
};

struct dwc3_ep_file_map {
	const char name[25];
	const struct file_operations *const fops;
};

static int dwc3_tx_fifo_queue_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	u32			val;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_TXFIFOQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_rx_fifo_queue_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	u32			val;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_RXFIFOQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_tx_request_queue_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	u32			val;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_TXREQQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_rx_request_queue_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	u32			val;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_RXREQQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_rx_info_queue_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	u32			val;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_RXINFOQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_descriptor_fetch_queue_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	u32			val;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_DESCFETCHQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_event_queue_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	u32			val;

	if (atomic_read(&dwc->in_lpm)) {
		seq_puts(s, "USB device is powered off\n");
		return 0;
	}

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_EVENTQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_transfer_type_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;

	spin_lock_irqsave(&dwc->lock, flags);
	if (!(dep->flags & DWC3_EP_ENABLED) ||
			!dep->endpoint.desc) {
		seq_printf(s, "--\n");
		goto out;
	}

	switch (usb_endpoint_type(dep->endpoint.desc)) {
	case USB_ENDPOINT_XFER_CONTROL:
		seq_printf(s, "control\n");
		break;
	case USB_ENDPOINT_XFER_ISOC:
		seq_printf(s, "isochronous\n");
		break;
	case USB_ENDPOINT_XFER_BULK:
		seq_printf(s, "bulk\n");
		break;
	case USB_ENDPOINT_XFER_INT:
		seq_printf(s, "interrupt\n");
		break;
	default:
		seq_printf(s, "--\n");
	}

out:
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_trb_ring_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	int			i;

	spin_lock_irqsave(&dwc->lock, flags);
	if (dep->number <= 1) {
		seq_printf(s, "--\n");
		goto out;
	}

	seq_printf(s, "buffer_addr,size,type,ioc,isp_imi,csp,chn,lst,hwo\n");

	for (i = 0; i < DWC3_TRB_NUM; i++) {
		struct dwc3_trb *trb = &dep->trb_pool[i];
		unsigned int type = DWC3_TRBCTL_TYPE(trb->ctrl);

		seq_printf(s, "%08x%08x,%d,%s,%d,%d,%d,%d,%d,%d       %c%c\n",
				trb->bph, trb->bpl, trb->size,
				dwc3_trb_type_string(type),
				!!(trb->ctrl & DWC3_TRB_CTRL_IOC),
				!!(trb->ctrl & DWC3_TRB_CTRL_ISP_IMI),
				!!(trb->ctrl & DWC3_TRB_CTRL_CSP),
				!!(trb->ctrl & DWC3_TRB_CTRL_CHN),
				!!(trb->ctrl & DWC3_TRB_CTRL_LST),
				!!(trb->ctrl & DWC3_TRB_CTRL_HWO),
				dep->trb_enqueue == i ? 'E' : ' ',
				dep->trb_dequeue == i ? 'D' : ' ');
	}

out:
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(dwc3_tx_fifo_queue);
DEFINE_SHOW_ATTRIBUTE(dwc3_rx_fifo_queue);
DEFINE_SHOW_ATTRIBUTE(dwc3_tx_request_queue);
DEFINE_SHOW_ATTRIBUTE(dwc3_rx_request_queue);
DEFINE_SHOW_ATTRIBUTE(dwc3_rx_info_queue);
DEFINE_SHOW_ATTRIBUTE(dwc3_descriptor_fetch_queue);
DEFINE_SHOW_ATTRIBUTE(dwc3_event_queue);
DEFINE_SHOW_ATTRIBUTE(dwc3_transfer_type);
DEFINE_SHOW_ATTRIBUTE(dwc3_trb_ring);

static const struct dwc3_ep_file_map dwc3_ep_file_map[] = {
	{ "tx_fifo_queue", &dwc3_tx_fifo_queue_fops, },
	{ "rx_fifo_queue", &dwc3_rx_fifo_queue_fops, },
	{ "tx_request_queue", &dwc3_tx_request_queue_fops, },
	{ "rx_request_queue", &dwc3_rx_request_queue_fops, },
	{ "rx_info_queue", &dwc3_rx_info_queue_fops, },
	{ "descriptor_fetch_queue", &dwc3_descriptor_fetch_queue_fops, },
	{ "event_queue", &dwc3_event_queue_fops, },
	{ "transfer_type", &dwc3_transfer_type_fops, },
	{ "trb_ring", &dwc3_trb_ring_fops, },
};

static void dwc3_debugfs_create_endpoint_files(struct dwc3_ep *dep,
		struct dentry *parent)
{
	int			i;

	for (i = 0; i < ARRAY_SIZE(dwc3_ep_file_map); i++) {
		const struct file_operations *fops = dwc3_ep_file_map[i].fops;
		const char *name = dwc3_ep_file_map[i].name;

		debugfs_create_file(name, S_IRUGO, parent, dep, fops);
	}
}

static void dwc3_debugfs_create_endpoint_dir(struct dwc3_ep *dep,
		struct dentry *parent)
{
	struct dentry		*dir;

	dir = debugfs_create_dir(dep->name, parent);
	if (!dir) {
		pr_err("%s: failed to create dir %s\n", __func__, dep->name);
		return;
	}

	dwc3_debugfs_create_endpoint_files(dep, dir);
}

static void dwc3_debugfs_create_endpoint_dirs(struct dwc3 *dwc,
		struct dentry *parent)
{
	int			i;

	for (i = 0; i < dwc->num_eps; i++) {
		struct dwc3_ep	*dep = dwc->eps[i];

		if (!dep)
			continue;

		dwc3_debugfs_create_endpoint_dir(dep, parent);
	}
}

static ssize_t dwc3_store_int_events(struct file *file,
			const char __user *ubuf, size_t count, loff_t *ppos)
{
	int i, ret;
	unsigned long flags;
	struct seq_file *s = file->private_data;
	struct dwc3 *dwc = s->private;
	struct dwc3_ep *dep;
	struct timespec ts;
	u8 clear_stats;

	if (ubuf == NULL) {
		pr_err("[%s] EINVAL\n", __func__);
		ret = -EINVAL;
		return ret;
	}

	ret = kstrtou8_from_user(ubuf, count, 0, &clear_stats);
	if (ret < 0) {
		pr_err("can't get enter value.\n");
		return ret;
	}

	if (clear_stats != 0) {
		pr_err("Wrong value. To clear stats, enter value as 0.\n");
		ret = -EINVAL;
		return ret;
	}

	pr_debug("%s(): clearing debug interrupt buffers\n", __func__);
	spin_lock_irqsave(&dwc->lock, flags);
	ts = current_kernel_time();
	for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
		dep = dwc->eps[i];
		memset(&dep->dbg_ep_events, 0, sizeof(dep->dbg_ep_events));
		memset(&dep->dbg_ep_events_diff, 0, sizeof(dep->dbg_ep_events));
		dep->dbg_ep_events_ts = ts;
	}
	memset(&dwc->dbg_gadget_events, 0, sizeof(dwc->dbg_gadget_events));
	spin_unlock_irqrestore(&dwc->lock, flags);
	return count;
}

static int dwc3_gadget_int_events_show(struct seq_file *s, void *unused)
{
	unsigned long   flags;
	struct dwc3 *dwc = s->private;
	struct dwc3_gadget_events *dbg_gadget_events;
	struct dwc3_ep *dep;
	int i;
	struct timespec ts_delta;
	struct timespec ts_current;
	u32 ts_delta_ms;

	spin_lock_irqsave(&dwc->lock, flags);
	dbg_gadget_events = &dwc->dbg_gadget_events;

	for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) {
		dep = dwc->eps[i];

		if (dep == NULL || !(dep->flags & DWC3_EP_ENABLED))
			continue;

		ts_current = current_kernel_time();
		ts_delta = timespec_sub(ts_current, dep->dbg_ep_events_ts);
		ts_delta_ms = ts_delta.tv_nsec / NSEC_PER_MSEC +
			ts_delta.tv_sec * MSEC_PER_SEC;

		seq_printf(s, "\n\n===== dbg_ep_events for EP(%d) %s =====\n",
			i, dep->name);
		seq_printf(s, "xfercomplete:%u @ %luHz\n",
			dep->dbg_ep_events.xfercomplete,
			ep_event_rate(xfercomplete, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));
		seq_printf(s, "xfernotready:%u @ %luHz\n",
			dep->dbg_ep_events.xfernotready,
			ep_event_rate(xfernotready, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));
		seq_printf(s, "control_data:%u @ %luHz\n",
			dep->dbg_ep_events.control_data,
			ep_event_rate(control_data, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));
		seq_printf(s, "control_status:%u @ %luHz\n",
			dep->dbg_ep_events.control_status,
			ep_event_rate(control_status, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));
		seq_printf(s, "xferinprogress:%u @ %luHz\n",
			dep->dbg_ep_events.xferinprogress,
			ep_event_rate(xferinprogress, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));
		seq_printf(s, "rxtxfifoevent:%u @ %luHz\n",
			dep->dbg_ep_events.rxtxfifoevent,
			ep_event_rate(rxtxfifoevent, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));
		seq_printf(s, "streamevent:%u @ %luHz\n",
			dep->dbg_ep_events.streamevent,
			ep_event_rate(streamevent, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));
		seq_printf(s, "epcmdcomplt:%u @ %luHz\n",
			dep->dbg_ep_events.epcmdcomplete,
			ep_event_rate(epcmdcomplete, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));
		seq_printf(s, "unknown:%u @ %luHz\n",
			dep->dbg_ep_events.unknown_event,
			ep_event_rate(unknown_event, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));
		seq_printf(s, "total:%u @ %luHz\n",
			dep->dbg_ep_events.total,
			ep_event_rate(total, dep->dbg_ep_events,
				dep->dbg_ep_events_diff, ts_delta_ms));

		dep->dbg_ep_events_ts = ts_current;
		dep->dbg_ep_events_diff = dep->dbg_ep_events;
	}

	seq_puts(s, "\n=== dbg_gadget events ==\n");
	seq_printf(s, "disconnect:%u\n reset:%u\n",
		dbg_gadget_events->disconnect, dbg_gadget_events->reset);
	seq_printf(s, "connect:%u\n wakeup:%u\n",
		dbg_gadget_events->connect, dbg_gadget_events->wakeup);
	seq_printf(s, "link_status_change:%u\n eopf:%u\n",
		dbg_gadget_events->link_status_change, dbg_gadget_events->eopf);
	seq_printf(s, "sof:%u\n suspend:%u\n",
		dbg_gadget_events->sof, dbg_gadget_events->suspend);
	seq_printf(s, "erratic_error:%u\n overflow:%u\n",
		dbg_gadget_events->erratic_error,
		dbg_gadget_events->overflow);
	seq_printf(s, "vendor_dev_test_lmp:%u\n cmdcmplt:%u\n",
		dbg_gadget_events->vendor_dev_test_lmp,
		dbg_gadget_events->cmdcmplt);
	seq_printf(s, "unknown_event:%u\n", dbg_gadget_events->unknown_event);

	seq_printf(s, "\n\t== Last %d interrupts stats ==\t\n", MAX_INTR_STATS);
	seq_puts(s, "@ time (us):\t");
	for (i = 0; i < MAX_INTR_STATS; i++)
		seq_printf(s, "%lld\t", ktime_to_us(dwc->irq_start_time[i]));
	seq_puts(s, "\nhard irq time (us):\t");
	for (i = 0; i < MAX_INTR_STATS; i++)
		seq_printf(s, "%d\t", dwc->irq_completion_time[i]);
	seq_puts(s, "\nevents count:\t\t");
	for (i = 0; i < MAX_INTR_STATS; i++)
		seq_printf(s, "%d\t", dwc->irq_event_count[i]);
	seq_puts(s, "\nbh handled count:\t");
	for (i = 0; i < MAX_INTR_STATS; i++)
		seq_printf(s, "%d\t", dwc->bh_handled_evt_cnt[i]);
	seq_puts(s, "\nirq thread time (us):\t");
	for (i = 0; i < MAX_INTR_STATS; i++)
		seq_printf(s, "%d\t", dwc->bh_completion_time[i]);
	seq_putc(s, '\n');

	seq_printf(s, "t_pwr evt irq : %lld\n",
			ktime_to_us(dwc->t_pwr_evt_irq));

	seq_printf(s, "l1_remote_wakeup_cnt : %lu\n",
		dwc->l1_remote_wakeup_cnt);

	spin_unlock_irqrestore(&dwc->lock, flags);
	return 0;
}

static int dwc3_gadget_events_open(struct inode *inode, struct file *f)
{
	return single_open(f, dwc3_gadget_int_events_show, inode->i_private);
}

const struct file_operations dwc3_gadget_dbg_events_fops = {
	.open		= dwc3_gadget_events_open,
	.read		= seq_read,
	.write		= dwc3_store_int_events,
	.llseek		= seq_lseek,
	.release	= single_release,
};

void dwc3_debugfs_init(struct dwc3 *dwc)
{
	struct dentry		*root;
	struct dentry           *file;

	dwc->regset = kzalloc(sizeof(*dwc->regset), GFP_KERNEL);
	if (!dwc->regset)
		return;

	dwc->regset->regs = dwc3_regs;
	dwc->regset->nregs = ARRAY_SIZE(dwc3_regs);
	dwc->regset->base = dwc->regs - DWC3_GLOBALS_REGS_START;

	root = debugfs_create_dir(dev_name(dwc->dev), NULL);
	if (!root) {
		pr_err("%s: failed to create dir %s\n", __func__,
				dev_name(dwc->dev));
		return;
	}

	dwc->root = root;

	debugfs_create_file("regdump", 0444, root, dwc, &dwc3_regdump_fops);

	if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)) {
		debugfs_create_file("mode", S_IRUGO | S_IWUSR, root, dwc,
				    &dwc3_mode_fops);
	}

	if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE) ||
			IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
		debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root, dwc,
				    &dwc3_testmode_fops);
		debugfs_create_file("link_state", S_IRUGO | S_IWUSR, root, dwc,
				    &dwc3_link_state_fops);
		dwc3_debugfs_create_endpoint_dirs(dwc, root);

		file = debugfs_create_file("int_events", 0644, root, dwc,
				&dwc3_gadget_dbg_events_fops);
		if (!file)
			dev_dbg(dwc->dev, "Can't create debugfs int_events\n");
	}
}

void dwc3_debugfs_exit(struct dwc3 *dwc)
{
	debugfs_remove_recursive(dwc->root);
	kfree(dwc->regset);
}