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 DWC3_LSP_MUX_UNSELECTED 0xfffff

#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,		\
	}


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(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 void dwc3_host_lsp(struct seq_file *s)
{
	struct dwc3		*dwc = s->private;
	bool			dbc_enabled;
	u32			sel;
	u32			reg;
	u32			val;

	dbc_enabled = !!(dwc->hwparams.hwparams1 & DWC3_GHWPARAMS1_ENDBC);

	sel = dwc->dbg_lsp_select;
	if (sel == DWC3_LSP_MUX_UNSELECTED) {
		seq_puts(s, "Write LSP selection to print for host\n");
		return;
	}

	reg = DWC3_GDBGLSPMUX_HOSTSELECT(sel);

	dwc3_writel(dwc->regs, DWC3_GDBGLSPMUX, reg);
	val = dwc3_readl(dwc->regs, DWC3_GDBGLSP);
	seq_printf(s, "GDBGLSP[%d] = 0x%08x\n", sel, val);

	if (dbc_enabled && sel < 256) {
		reg |= DWC3_GDBGLSPMUX_ENDBC;
		dwc3_writel(dwc->regs, DWC3_GDBGLSPMUX, reg);
		val = dwc3_readl(dwc->regs, DWC3_GDBGLSP);
		seq_printf(s, "GDBGLSP_DBC[%d] = 0x%08x\n", sel, val);
	}
}

static void dwc3_gadget_lsp(struct seq_file *s)
{
	struct dwc3		*dwc = s->private;
	int			i;
	u32			reg;

	for (i = 0; i < 16; i++) {
		reg = DWC3_GDBGLSPMUX_DEVSELECT(i);
		dwc3_writel(dwc->regs, DWC3_GDBGLSPMUX, reg);
		reg = dwc3_readl(dwc->regs, DWC3_GDBGLSP);
		seq_printf(s, "GDBGLSP[%d] = 0x%08x\n", i, reg);
	}
}

static int dwc3_lsp_show(struct seq_file *s, void *unused)
{
	struct dwc3		*dwc = s->private;
	unsigned int		current_mode;
	unsigned long		flags;
	u32			reg;

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_GSTS);
	current_mode = DWC3_GSTS_CURMOD(reg);

	switch (current_mode) {
	case DWC3_GSTS_CURMOD_HOST:
		dwc3_host_lsp(s);
		break;
	case DWC3_GSTS_CURMOD_DEVICE:
		dwc3_gadget_lsp(s);
		break;
	default:
		seq_puts(s, "Mode is unknown, no LSP register printed\n");
		break;
	}
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_lsp_open(struct inode *inode, struct file *file)
{
	return single_open(file, dwc3_lsp_show, inode->i_private);
}

static ssize_t dwc3_lsp_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;
	char			buf[32] = { 0 };
	u32			sel;
	int			ret;

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

	ret = kstrtouint(buf, 0, &sel);
	if (ret)
		return ret;

	spin_lock_irqsave(&dwc->lock, flags);
	dwc->dbg_lsp_select = sel;
	spin_unlock_irqrestore(&dwc->lock, flags);

	return count;
}

static const struct file_operations dwc3_lsp_fops = {
	.open			= dwc3_lsp_open,
	.write			= dwc3_lsp_write,
	.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;

	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 (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;

	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 (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;

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_GSTS);
	if (DWC3_GSTS_CURMOD(reg) != DWC3_GSTS_CURMOD_DEVICE) {
		seq_puts(s, "Not available\n");
		spin_unlock_irqrestore(&dwc->lock, flags);
		return 0;
	}

	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 (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_GSTS);
	if (DWC3_GSTS_CURMOD(reg) != DWC3_GSTS_CURMOD_DEVICE) {
		spin_unlock_irqrestore(&dwc->lock, flags);
		return -EINVAL;
	}

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

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_TXFIFO);

	/* Convert to bytes */
	val *= DWC3_MDWIDTH(dwc->hwparams.hwparams0);
	val >>= 3;
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

static int dwc3_rx_fifo_size_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	u32			val;

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_RXFIFO);

	/* Convert to bytes */
	val *= DWC3_MDWIDTH(dwc->hwparams.hwparams0);
	val >>= 3;
	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;

	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;

	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;

	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;

	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;

	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;
}

static int dwc3_ep_info_register_show(struct seq_file *s, void *unused)
{
	struct dwc3_ep		*dep = s->private;
	struct dwc3		*dwc = dep->dwc;
	unsigned long		flags;
	u64			ep_info;
	u32			lower_32_bits;
	u32			upper_32_bits;
	u32			reg;

	spin_lock_irqsave(&dwc->lock, flags);
	reg = DWC3_GDBGLSPMUX_EPSELECT(dep->number);
	dwc3_writel(dwc->regs, DWC3_GDBGLSPMUX, reg);

	lower_32_bits = dwc3_readl(dwc->regs, DWC3_GDBGEPINFO0);
	upper_32_bits = dwc3_readl(dwc->regs, DWC3_GDBGEPINFO1);

	ep_info = ((u64)upper_32_bits << 32) | lower_32_bits;
	seq_printf(s, "0x%016llx\n", ep_info);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
}

DEFINE_SHOW_ATTRIBUTE(dwc3_tx_fifo_size);
DEFINE_SHOW_ATTRIBUTE(dwc3_rx_fifo_size);
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);
DEFINE_SHOW_ATTRIBUTE(dwc3_ep_info_register);

static const struct dwc3_ep_file_map dwc3_ep_file_map[] = {
	{ "tx_fifo_size", &dwc3_tx_fifo_size_fops, },
	{ "rx_fifo_size", &dwc3_rx_fifo_size_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, },
	{ "GDBGEPINFO", &dwc3_ep_info_register_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);
	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);
	}
}

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

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

	dwc->dbg_lsp_select = DWC3_LSP_MUX_UNSELECTED;

	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);
	dwc->root = root;

	debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);

	debugfs_create_file("lsp_dump", S_IRUGO | S_IWUSR, root, dwc,
			    &dwc3_lsp_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);
	}
}

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