ehci-dbg.c 28.6 KB
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/*
 * Copyright (c) 2001-2002 by David Brownell
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 *
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 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* this file is part of ehci-hcd.c */

#define ehci_dbg(ehci, fmt, args...) \
	dev_dbg (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
#define ehci_err(ehci, fmt, args...) \
	dev_err (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
#define ehci_info(ehci, fmt, args...) \
	dev_info (ehci_to_hcd(ehci)->self.controller , fmt , ## args )
#define ehci_warn(ehci, fmt, args...) \
	dev_warn (ehci_to_hcd(ehci)->self.controller , fmt , ## args )

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#ifdef VERBOSE_DEBUG
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#	define vdbg dbg
#	define ehci_vdbg ehci_dbg
#else
#	define vdbg(fmt,args...) do { } while (0)
#	define ehci_vdbg(ehci, fmt, args...) do { } while (0)
#endif

#ifdef	DEBUG

/* check the values in the HCSPARAMS register
 * (host controller _Structural_ parameters)
 * see EHCI spec, Table 2-4 for each value
 */
static void dbg_hcs_params (struct ehci_hcd *ehci, char *label)
{
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	u32	params = ehci_readl(ehci, &ehci->caps->hcs_params);
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	ehci_dbg (ehci,
		"%s hcs_params 0x%x dbg=%d%s cc=%d pcc=%d%s%s ports=%d\n",
		label, params,
		HCS_DEBUG_PORT (params),
		HCS_INDICATOR (params) ? " ind" : "",
		HCS_N_CC (params),
		HCS_N_PCC (params),
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		HCS_PORTROUTED (params) ? "" : " ordered",
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		HCS_PPC (params) ? "" : " !ppc",
		HCS_N_PORTS (params)
		);
	/* Port routing, per EHCI 0.95 Spec, Section 2.2.5 */
	if (HCS_PORTROUTED (params)) {
		int i;
		char buf [46], tmp [7], byte;

		buf[0] = 0;
		for (i = 0; i < HCS_N_PORTS (params); i++) {
			// FIXME MIPS won't readb() ...
			byte = readb (&ehci->caps->portroute[(i>>1)]);
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			sprintf(tmp, "%d ",
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				((i & 0x1) ? ((byte)&0xf) : ((byte>>4)&0xf)));
			strcat(buf, tmp);
		}
		ehci_dbg (ehci, "%s portroute %s\n",
				label, buf);
	}
}
#else

static inline void dbg_hcs_params (struct ehci_hcd *ehci, char *label) {}

#endif

#ifdef	DEBUG

/* check the values in the HCCPARAMS register
 * (host controller _Capability_ parameters)
 * see EHCI Spec, Table 2-5 for each value
 * */
static void dbg_hcc_params (struct ehci_hcd *ehci, char *label)
{
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	u32	params = ehci_readl(ehci, &ehci->caps->hcc_params);
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	if (HCC_ISOC_CACHE (params)) {
		ehci_dbg (ehci,
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			"%s hcc_params %04x caching frame %s%s%s\n",
			label, params,
			HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
			HCC_CANPARK(params) ? " park" : "",
			HCC_64BIT_ADDR(params) ? " 64 bit addr" : "");
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	} else {
		ehci_dbg (ehci,
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			"%s hcc_params %04x thresh %d uframes %s%s%s%s%s%s%s\n",
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			label,
			params,
			HCC_ISOC_THRES(params),
			HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
			HCC_CANPARK(params) ? " park" : "",
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			HCC_64BIT_ADDR(params) ? " 64 bit addr" : "",
			HCC_LPM(params) ? " LPM" : "",
			HCC_PER_PORT_CHANGE_EVENT(params) ? " ppce" : "",
			HCC_HW_PREFETCH(params) ? " hw prefetch" : "",
			HCC_32FRAME_PERIODIC_LIST(params) ?
				" 32 peridic list" : "");
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	}
}
#else

static inline void dbg_hcc_params (struct ehci_hcd *ehci, char *label) {}

#endif

#ifdef	DEBUG

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static void __maybe_unused
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dbg_qtd (const char *label, struct ehci_hcd *ehci, struct ehci_qtd *qtd)
{
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	ehci_dbg(ehci, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
		hc32_to_cpup(ehci, &qtd->hw_next),
		hc32_to_cpup(ehci, &qtd->hw_alt_next),
		hc32_to_cpup(ehci, &qtd->hw_token),
		hc32_to_cpup(ehci, &qtd->hw_buf [0]));
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	if (qtd->hw_buf [1])
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		ehci_dbg(ehci, "  p1=%08x p2=%08x p3=%08x p4=%08x\n",
			hc32_to_cpup(ehci, &qtd->hw_buf[1]),
			hc32_to_cpup(ehci, &qtd->hw_buf[2]),
			hc32_to_cpup(ehci, &qtd->hw_buf[3]),
			hc32_to_cpup(ehci, &qtd->hw_buf[4]));
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}

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static void __maybe_unused
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dbg_qh (const char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
{
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	struct ehci_qh_hw *hw = qh->hw;

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	ehci_dbg (ehci, "%s qh %p n%08x info %x %x qtd %x\n", label,
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		qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
	dbg_qtd("overlay", ehci, (struct ehci_qtd *) &hw->hw_qtd_next);
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}

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static void __maybe_unused
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dbg_itd (const char *label, struct ehci_hcd *ehci, struct ehci_itd *itd)
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{
	ehci_dbg (ehci, "%s [%d] itd %p, next %08x, urb %p\n",
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		label, itd->frame, itd, hc32_to_cpu(ehci, itd->hw_next),
		itd->urb);
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	ehci_dbg (ehci,
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		"  trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
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		hc32_to_cpu(ehci, itd->hw_transaction[0]),
		hc32_to_cpu(ehci, itd->hw_transaction[1]),
		hc32_to_cpu(ehci, itd->hw_transaction[2]),
		hc32_to_cpu(ehci, itd->hw_transaction[3]),
		hc32_to_cpu(ehci, itd->hw_transaction[4]),
		hc32_to_cpu(ehci, itd->hw_transaction[5]),
		hc32_to_cpu(ehci, itd->hw_transaction[6]),
		hc32_to_cpu(ehci, itd->hw_transaction[7]));
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	ehci_dbg (ehci,
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		"  buf:   %08x %08x %08x %08x %08x %08x %08x\n",
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		hc32_to_cpu(ehci, itd->hw_bufp[0]),
		hc32_to_cpu(ehci, itd->hw_bufp[1]),
		hc32_to_cpu(ehci, itd->hw_bufp[2]),
		hc32_to_cpu(ehci, itd->hw_bufp[3]),
		hc32_to_cpu(ehci, itd->hw_bufp[4]),
		hc32_to_cpu(ehci, itd->hw_bufp[5]),
		hc32_to_cpu(ehci, itd->hw_bufp[6]));
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	ehci_dbg (ehci, "  index: %d %d %d %d %d %d %d %d\n",
		itd->index[0], itd->index[1], itd->index[2],
		itd->index[3], itd->index[4], itd->index[5],
		itd->index[6], itd->index[7]);
}

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static void __maybe_unused
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dbg_sitd (const char *label, struct ehci_hcd *ehci, struct ehci_sitd *sitd)
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{
	ehci_dbg (ehci, "%s [%d] sitd %p, next %08x, urb %p\n",
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		label, sitd->frame, sitd, hc32_to_cpu(ehci, sitd->hw_next),
		sitd->urb);
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	ehci_dbg (ehci,
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		"  addr %08x sched %04x result %08x buf %08x %08x\n",
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		hc32_to_cpu(ehci, sitd->hw_fullspeed_ep),
		hc32_to_cpu(ehci, sitd->hw_uframe),
		hc32_to_cpu(ehci, sitd->hw_results),
		hc32_to_cpu(ehci, sitd->hw_buf[0]),
		hc32_to_cpu(ehci, sitd->hw_buf[1]));
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}

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static int __maybe_unused
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dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
{
	return scnprintf (buf, len,
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		"%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s%s",
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		label, label [0] ? " " : "", status,
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		(status & STS_PPCE_MASK) ? " PPCE" : "",
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		(status & STS_ASS) ? " Async" : "",
		(status & STS_PSS) ? " Periodic" : "",
		(status & STS_RECL) ? " Recl" : "",
		(status & STS_HALT) ? " Halt" : "",
		(status & STS_IAA) ? " IAA" : "",
		(status & STS_FATAL) ? " FATAL" : "",
		(status & STS_FLR) ? " FLR" : "",
		(status & STS_PCD) ? " PCD" : "",
		(status & STS_ERR) ? " ERR" : "",
		(status & STS_INT) ? " INT" : ""
		);
}

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static int __maybe_unused
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dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
{
	return scnprintf (buf, len,
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		"%s%sintrenable %02x%s%s%s%s%s%s%s",
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		label, label [0] ? " " : "", enable,
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		(enable & STS_PPCE_MASK) ? " PPCE" : "",
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		(enable & STS_IAA) ? " IAA" : "",
		(enable & STS_FATAL) ? " FATAL" : "",
		(enable & STS_FLR) ? " FLR" : "",
		(enable & STS_PCD) ? " PCD" : "",
		(enable & STS_ERR) ? " ERR" : "",
		(enable & STS_INT) ? " INT" : ""
		);
}

static const char *const fls_strings [] =
    { "1024", "512", "256", "??" };

static int
dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
{
	return scnprintf (buf, len,
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		"%s%scommand %07x %s%s%s%s%s%s=%d ithresh=%d%s%s%s%s "
		"period=%s%s %s",
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		label, label [0] ? " " : "", command,
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		(command & CMD_HIRD) ? " HIRD" : "",
		(command & CMD_PPCEE) ? " PPCEE" : "",
		(command & CMD_FSP) ? " FSP" : "",
		(command & CMD_ASPE) ? " ASPE" : "",
		(command & CMD_PSPE) ? " PSPE" : "",
		(command & CMD_PARK) ? " park" : "(park)",
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		CMD_PARK_CNT (command),
		(command >> 16) & 0x3f,
		(command & CMD_LRESET) ? " LReset" : "",
		(command & CMD_IAAD) ? " IAAD" : "",
		(command & CMD_ASE) ? " Async" : "",
		(command & CMD_PSE) ? " Periodic" : "",
		fls_strings [(command >> 2) & 0x3],
		(command & CMD_RESET) ? " Reset" : "",
		(command & CMD_RUN) ? "RUN" : "HALT"
		);
}

static int
dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
{
	char	*sig;

	/* signaling state */
	switch (status & (3 << 10)) {
	case 0 << 10: sig = "se0"; break;
	case 1 << 10: sig = "k"; break;		/* low speed */
	case 2 << 10: sig = "j"; break;
	default: sig = "?"; break;
	}

	return scnprintf (buf, len,
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		"%s%sport:%d status %06x %d %s%s%s%s%s%s "
		"sig=%s%s%s%s%s%s%s%s%s%s%s",
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		label, label [0] ? " " : "", port, status,
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		status>>25,/*device address */
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ACK ?
						" ACK" : "",
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_NYET ?
						" NYET" : "",
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_STALL ?
						" STALL" : "",
		(status & PORT_SSTS)>>23 == PORTSC_SUSPEND_STS_ERR ?
						" ERR" : "",
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		(status & PORT_POWER) ? " POWER" : "",
		(status & PORT_OWNER) ? " OWNER" : "",
		sig,
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		(status & PORT_LPM) ? " LPM" : "",
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		(status & PORT_RESET) ? " RESET" : "",
		(status & PORT_SUSPEND) ? " SUSPEND" : "",
		(status & PORT_RESUME) ? " RESUME" : "",
		(status & PORT_OCC) ? " OCC" : "",
		(status & PORT_OC) ? " OC" : "",
		(status & PORT_PEC) ? " PEC" : "",
		(status & PORT_PE) ? " PE" : "",
		(status & PORT_CSC) ? " CSC" : "",
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		(status & PORT_CONNECT) ? " CONNECT" : "");
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}

#else
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static inline void __maybe_unused
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dbg_qh (char *label, struct ehci_hcd *ehci, struct ehci_qh *qh)
{}

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static inline int __maybe_unused
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dbg_status_buf (char *buf, unsigned len, const char *label, u32 status)
{ return 0; }

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static inline int __maybe_unused
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dbg_command_buf (char *buf, unsigned len, const char *label, u32 command)
{ return 0; }

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static inline int __maybe_unused
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dbg_intr_buf (char *buf, unsigned len, const char *label, u32 enable)
{ return 0; }

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static inline int __maybe_unused
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dbg_port_buf (char *buf, unsigned len, const char *label, int port, u32 status)
{ return 0; }

#endif	/* DEBUG */

/* functions have the "wrong" filename when they're output... */
#define dbg_status(ehci, label, status) { \
	char _buf [80]; \
	dbg_status_buf (_buf, sizeof _buf, label, status); \
	ehci_dbg (ehci, "%s\n", _buf); \
}

#define dbg_cmd(ehci, label, command) { \
	char _buf [80]; \
	dbg_command_buf (_buf, sizeof _buf, label, command); \
	ehci_dbg (ehci, "%s\n", _buf); \
}

#define dbg_port(ehci, label, port, status) { \
	char _buf [80]; \
	dbg_port_buf (_buf, sizeof _buf, label, port, status); \
	ehci_dbg (ehci, "%s\n", _buf); \
}

/*-------------------------------------------------------------------------*/

#ifdef STUB_DEBUG_FILES

static inline void create_debug_files (struct ehci_hcd *bus) { }
static inline void remove_debug_files (struct ehci_hcd *bus) { }

#else

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/* troubleshooting help: expose state in debugfs */

static int debug_async_open(struct inode *, struct file *);
static int debug_periodic_open(struct inode *, struct file *);
static int debug_registers_open(struct inode *, struct file *);
static int debug_async_open(struct inode *, struct file *);
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static int debug_lpm_open(struct inode *, struct file *);
static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
				   size_t count, loff_t *ppos);
static ssize_t debug_lpm_write(struct file *file, const char __user *buffer,
			      size_t count, loff_t *ppos);
static int debug_lpm_close(struct inode *inode, struct file *file);

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static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
static int debug_close(struct inode *, struct file *);

static const struct file_operations debug_async_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_async_open,
	.read		= debug_output,
	.release	= debug_close,
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	.llseek		= default_llseek,
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};
static const struct file_operations debug_periodic_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_periodic_open,
	.read		= debug_output,
	.release	= debug_close,
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	.llseek		= default_llseek,
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};
static const struct file_operations debug_registers_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_registers_open,
	.read		= debug_output,
	.release	= debug_close,
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	.llseek		= default_llseek,
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};
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static const struct file_operations debug_lpm_fops = {
	.owner		= THIS_MODULE,
	.open		= debug_lpm_open,
	.read		= debug_lpm_read,
	.write		= debug_lpm_write,
	.release	= debug_lpm_close,
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	.llseek		= noop_llseek,
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};
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static struct dentry *ehci_debug_root;

struct debug_buffer {
	ssize_t (*fill_func)(struct debug_buffer *);	/* fill method */
	struct usb_bus *bus;
	struct mutex mutex;	/* protect filling of buffer */
	size_t count;		/* number of characters filled into buffer */
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	char *output_buf;
	size_t alloc_size;
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};
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#define speed_char(info1) ({ char tmp; \
		switch (info1 & (3 << 12)) { \
		case 0 << 12: tmp = 'f'; break; \
		case 1 << 12: tmp = 'l'; break; \
		case 2 << 12: tmp = 'h'; break; \
		default: tmp = '?'; break; \
		}; tmp; })

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static inline char token_mark(struct ehci_hcd *ehci, __hc32 token)
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{
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	__u32 v = hc32_to_cpu(ehci, token);

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	if (v & QTD_STS_ACTIVE)
		return '*';
	if (v & QTD_STS_HALT)
		return '-';
	if (!IS_SHORT_READ (v))
		return ' ';
	/* tries to advance through hw_alt_next */
	return '/';
}

static void qh_lines (
	struct ehci_hcd *ehci,
	struct ehci_qh *qh,
	char **nextp,
	unsigned *sizep
)
{
	u32			scratch;
	u32			hw_curr;
	struct list_head	*entry;
	struct ehci_qtd		*td;
	unsigned		temp;
	unsigned		size = *sizep;
	char			*next = *nextp;
	char			mark;
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	__le32			list_end = EHCI_LIST_END(ehci);
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	struct ehci_qh_hw	*hw = qh->hw;
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	if (hw->hw_qtd_next == list_end)	/* NEC does this */
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		mark = '@';
	else
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		mark = token_mark(ehci, hw->hw_token);
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	if (mark == '/') {	/* qh_alt_next controls qh advance? */
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		if ((hw->hw_alt_next & QTD_MASK(ehci))
				== ehci->async->hw->hw_alt_next)
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			mark = '#';	/* blocked */
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		else if (hw->hw_alt_next == list_end)
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			mark = '.';	/* use hw_qtd_next */
		/* else alt_next points to some other qtd */
	}
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	scratch = hc32_to_cpup(ehci, &hw->hw_info1);
	hw_curr = (mark == '*') ? hc32_to_cpup(ehci, &hw->hw_current) : 0;
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	temp = scnprintf (next, size,
			"qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
			qh, scratch & 0x007f,
			speed_char (scratch),
			(scratch >> 8) & 0x000f,
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			scratch, hc32_to_cpup(ehci, &hw->hw_info2),
			hc32_to_cpup(ehci, &hw->hw_token), mark,
			(cpu_to_hc32(ehci, QTD_TOGGLE) & hw->hw_token)
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				? "data1" : "data0",
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			(hc32_to_cpup(ehci, &hw->hw_alt_next) >> 1) & 0x0f);
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	size -= temp;
	next += temp;

	/* hc may be modifying the list as we read it ... */
	list_for_each (entry, &qh->qtd_list) {
		td = list_entry (entry, struct ehci_qtd, qtd_list);
478
		scratch = hc32_to_cpup(ehci, &td->hw_token);
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		mark = ' ';
		if (hw_curr == td->qtd_dma)
			mark = '*';
482
		else if (hw->hw_qtd_next == cpu_to_hc32(ehci, td->qtd_dma))
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			mark = '+';
		else if (QTD_LENGTH (scratch)) {
485
			if (td->hw_alt_next == ehci->async->hw->hw_alt_next)
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				mark = '#';
487
			else if (td->hw_alt_next != list_end)
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				mark = '/';
		}
		temp = snprintf (next, size,
				"\n\t%p%c%s len=%d %08x urb %p",
				td, mark, ({ char *tmp;
				 switch ((scratch>>8)&0x03) {
				 case 0: tmp = "out"; break;
				 case 1: tmp = "in"; break;
				 case 2: tmp = "setup"; break;
				 default: tmp = "?"; break;
				 } tmp;}),
				(scratch >> 16) & 0x7fff,
				scratch,
				td->urb);
502
		if (size < temp)
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			temp = size;
		size -= temp;
		next += temp;
		if (temp == size)
			goto done;
	}

	temp = snprintf (next, size, "\n");
511
	if (size < temp)
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		temp = size;
	size -= temp;
	next += temp;

done:
	*sizep = size;
	*nextp = next;
}

521
static ssize_t fill_async_buffer(struct debug_buffer *buf)
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{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	unsigned long		flags;
	unsigned		temp, size;
	char			*next;
	struct ehci_qh		*qh;

530
	hcd = bus_to_hcd(buf->bus);
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	ehci = hcd_to_ehci (hcd);
532 533
	next = buf->output_buf;
	size = buf->alloc_size;
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535 536
	*next = 0;

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	/* dumps a snapshot of the async schedule.
	 * usually empty except for long-term bulk reads, or head.
	 * one QH per line, and TDs we know about
	 */
	spin_lock_irqsave (&ehci->lock, flags);
	for (qh = ehci->async->qh_next.qh; size > 0 && qh; qh = qh->qh_next.qh)
		qh_lines (ehci, qh, &next, &size);
	if (ehci->reclaim && size > 0) {
		temp = scnprintf (next, size, "\nreclaim =\n");
		size -= temp;
		next += temp;

		for (qh = ehci->reclaim; size > 0 && qh; qh = qh->reclaim)
			qh_lines (ehci, qh, &next, &size);
	}
	spin_unlock_irqrestore (&ehci->lock, flags);

554
	return strlen(buf->output_buf);
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}

#define DBG_SCHED_LIMIT 64
558
static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
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{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	unsigned long		flags;
	union ehci_shadow	p, *seen;
	unsigned		temp, size, seen_count;
	char			*next;
	unsigned		i;
567
	__hc32			tag;
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569
	if (!(seen = kmalloc (DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
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		return 0;
	seen_count = 0;

573
	hcd = bus_to_hcd(buf->bus);
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	ehci = hcd_to_ehci (hcd);
575 576
	next = buf->output_buf;
	size = buf->alloc_size;
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	temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
	size -= temp;
	next += temp;

	/* dump a snapshot of the periodic schedule.
	 * iso changes, interrupt usually doesn't.
	 */
	spin_lock_irqsave (&ehci->lock, flags);
	for (i = 0; i < ehci->periodic_size; i++) {
		p = ehci->pshadow [i];
		if (likely (!p.ptr))
			continue;
590
		tag = Q_NEXT_TYPE(ehci, ehci->periodic [i]);
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		temp = scnprintf (next, size, "%4d: ", i);
		size -= temp;
		next += temp;

		do {
597 598
			struct ehci_qh_hw *hw;

599
			switch (hc32_to_cpu(ehci, tag)) {
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			case Q_TYPE_QH:
601
				hw = p.qh->hw;
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				temp = scnprintf (next, size, " qh%d-%04x/%p",
						p.qh->period,
604
						hc32_to_cpup(ehci,
605
							&hw->hw_info2)
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							/* uframe masks */
607
							& (QH_CMASK | QH_SMASK),
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						p.qh);
				size -= temp;
				next += temp;
				/* don't repeat what follows this qh */
				for (temp = 0; temp < seen_count; temp++) {
					if (seen [temp].ptr != p.ptr)
						continue;
615
					if (p.qh->qh_next.ptr) {
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						temp = scnprintf (next, size,
							" ...");
618 619 620
						size -= temp;
						next += temp;
					}
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					break;
				}
				/* show more info the first time around */
624
				if (temp == seen_count) {
625
					u32	scratch = hc32_to_cpup(ehci,
626
							&hw->hw_info1);
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					struct ehci_qtd	*qtd;
					char		*type = "";

					/* count tds, get ep direction */
					temp = 0;
					list_for_each_entry (qtd,
							&p.qh->qtd_list,
							qtd_list) {
						temp++;
636 637
						switch (0x03 & (hc32_to_cpu(
							ehci,
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							qtd->hw_token) >> 8)) {
						case 0: type = "out"; continue;
						case 1: type = "in"; continue;
						}
					}

					temp = scnprintf (next, size,
						" (%c%d ep%d%s "
						"[%d/%d] q%d p%d)",
						speed_char (scratch),
						scratch & 0x007f,
						(scratch >> 8) & 0x000f, type,
						p.qh->usecs, p.qh->c_usecs,
						temp,
						0x7ff & (scratch >> 16));

					if (seen_count < DBG_SCHED_LIMIT)
						seen [seen_count++].qh = p.qh;
				} else
					temp = 0;
				if (p.qh) {
659
					tag = Q_NEXT_TYPE(ehci, hw->hw_next);
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					p = p.qh->qh_next;
				}
				break;
			case Q_TYPE_FSTN:
				temp = scnprintf (next, size,
					" fstn-%8x/%p", p.fstn->hw_prev,
					p.fstn);
667
				tag = Q_NEXT_TYPE(ehci, p.fstn->hw_next);
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				p = p.fstn->fstn_next;
				break;
			case Q_TYPE_ITD:
				temp = scnprintf (next, size,
					" itd/%p", p.itd);
673
				tag = Q_NEXT_TYPE(ehci, p.itd->hw_next);
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				p = p.itd->itd_next;
				break;
			case Q_TYPE_SITD:
				temp = scnprintf (next, size,
					" sitd%d-%04x/%p",
					p.sitd->stream->interval,
680
					hc32_to_cpup(ehci, &p.sitd->hw_uframe)
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						& 0x0000ffff,
					p.sitd);
683
				tag = Q_NEXT_TYPE(ehci, p.sitd->hw_next);
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				p = p.sitd->sitd_next;
				break;
			}
			size -= temp;
			next += temp;
		} while (p.ptr);

		temp = scnprintf (next, size, "\n");
		size -= temp;
		next += temp;
	}
	spin_unlock_irqrestore (&ehci->lock, flags);
	kfree (seen);

698
	return buf->alloc_size - size;
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}
#undef DBG_SCHED_LIMIT

702
static ssize_t fill_registers_buffer(struct debug_buffer *buf)
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{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	unsigned long		flags;
	unsigned		temp, size, i;
	char			*next, scratch [80];
	static char		fmt [] = "%*s\n";
	static char		label [] = "";

712
	hcd = bus_to_hcd(buf->bus);
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	ehci = hcd_to_ehci (hcd);
714 715
	next = buf->output_buf;
	size = buf->alloc_size;
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	spin_lock_irqsave (&ehci->lock, flags);

719
	if (!HCD_HW_ACCESSIBLE(hcd)) {
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		size = scnprintf (next, size,
721
			"bus %s, device %s\n"
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			"%s\n"
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			"SUSPENDED (no register access)\n",
			hcd->self.controller->bus->name,
725
			dev_name(hcd->self.controller),
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			hcd->product_desc);
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		goto done;
	}

	/* Capability Registers */
731
	i = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
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	temp = scnprintf (next, size,
733
		"bus %s, device %s\n"
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		"%s\n"
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		"EHCI %x.%02x, hcd state %d\n",
		hcd->self.controller->bus->name,
737
		dev_name(hcd->self.controller),
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		hcd->product_desc,
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		i >> 8, i & 0x0ff, hcd->state);
	size -= temp;
	next += temp;

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#ifdef	CONFIG_PCI
	/* EHCI 0.96 and later may have "extended capabilities" */
	if (hcd->self.controller->bus == &pci_bus_type) {
		struct pci_dev	*pdev;
		u32		offset, cap, cap2;
		unsigned	count = 256/4;

		pdev = to_pci_dev(ehci_to_hcd(ehci)->self.controller);
751 752
		offset = HCC_EXT_CAPS(ehci_readl(ehci,
				&ehci->caps->hcc_params));
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		while (offset && count--) {
			pci_read_config_dword (pdev, offset, &cap);
			switch (cap & 0xff) {
			case 1:
				temp = scnprintf (next, size,
					"ownership %08x%s%s\n", cap,
					(cap & (1 << 24)) ? " linux" : "",
					(cap & (1 << 16)) ? " firmware" : "");
				size -= temp;
				next += temp;

				offset += 4;
				pci_read_config_dword (pdev, offset, &cap2);
				temp = scnprintf (next, size,
					"SMI sts/enable 0x%08x\n", cap2);
				size -= temp;
				next += temp;
				break;
			case 0:		/* illegal reserved capability */
				cap = 0;
				/* FALLTHROUGH */
			default:		/* unknown */
				break;
			}
			temp = (cap >> 8) & 0xff;
		}
	}
#endif

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	// FIXME interpret both types of params
783
	i = ehci_readl(ehci, &ehci->caps->hcs_params);
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	temp = scnprintf (next, size, "structural params 0x%08x\n", i);
	size -= temp;
	next += temp;

788
	i = ehci_readl(ehci, &ehci->caps->hcc_params);
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	temp = scnprintf (next, size, "capability params 0x%08x\n", i);
	size -= temp;
	next += temp;

	/* Operational Registers */
	temp = dbg_status_buf (scratch, sizeof scratch, label,
795
			ehci_readl(ehci, &ehci->regs->status));
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	temp = scnprintf (next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = dbg_command_buf (scratch, sizeof scratch, label,
801
			ehci_readl(ehci, &ehci->regs->command));
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	temp = scnprintf (next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = dbg_intr_buf (scratch, sizeof scratch, label,
807
			ehci_readl(ehci, &ehci->regs->intr_enable));
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	temp = scnprintf (next, size, fmt, temp, scratch);
	size -= temp;
	next += temp;

	temp = scnprintf (next, size, "uframe %04x\n",
813
			ehci_readl(ehci, &ehci->regs->frame_index));
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	size -= temp;
	next += temp;

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	for (i = 1; i <= HCS_N_PORTS (ehci->hcs_params); i++) {
		temp = dbg_port_buf (scratch, sizeof scratch, label, i,
819 820
				ehci_readl(ehci,
					&ehci->regs->port_status[i - 1]));
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		temp = scnprintf (next, size, fmt, temp, scratch);
		size -= temp;
		next += temp;
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		if (i == HCS_DEBUG_PORT(ehci->hcs_params) && ehci->debug) {
			temp = scnprintf (next, size,
					"    debug control %08x\n",
827 828
					ehci_readl(ehci,
						&ehci->debug->control));
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			size -= temp;
			next += temp;
		}
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	}

	if (ehci->reclaim) {
835
		temp = scnprintf(next, size, "reclaim qh %p\n", ehci->reclaim);
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		size -= temp;
		next += temp;
	}

#ifdef EHCI_STATS
	temp = scnprintf (next, size,
		"irq normal %ld err %ld reclaim %ld (lost %ld)\n",
		ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
		ehci->stats.lost_iaa);
	size -= temp;
	next += temp;

	temp = scnprintf (next, size, "complete %ld unlink %ld\n",
		ehci->stats.complete, ehci->stats.unlink);
	size -= temp;
	next += temp;
#endif

done:
	spin_unlock_irqrestore (&ehci->lock, flags);

857
	return buf->alloc_size - size;
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}

860 861
static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
				ssize_t (*fill_func)(struct debug_buffer *))
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{
863 864 865
	struct debug_buffer *buf;

	buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
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867 868 869 870
	if (buf) {
		buf->bus = bus;
		buf->fill_func = fill_func;
		mutex_init(&buf->mutex);
871
		buf->alloc_size = PAGE_SIZE;
872 873 874
	}

	return buf;
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}

877
static int fill_buffer(struct debug_buffer *buf)
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{
879 880
	int ret = 0;

881 882
	if (!buf->output_buf)
		buf->output_buf = (char *)vmalloc(buf->alloc_size);
883

884
	if (!buf->output_buf) {
885 886 887 888 889
		ret = -ENOMEM;
		goto out;
	}

	ret = buf->fill_func(buf);
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891 892 893 894 895 896 897
	if (ret >= 0) {
		buf->count = ret;
		ret = 0;
	}

out:
	return ret;
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}

900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916
static ssize_t debug_output(struct file *file, char __user *user_buf,
			    size_t len, loff_t *offset)
{
	struct debug_buffer *buf = file->private_data;
	int ret = 0;

	mutex_lock(&buf->mutex);
	if (buf->count == 0) {
		ret = fill_buffer(buf);
		if (ret != 0) {
			mutex_unlock(&buf->mutex);
			goto out;
		}
	}
	mutex_unlock(&buf->mutex);

	ret = simple_read_from_buffer(user_buf, len, offset,
917
				      buf->output_buf, buf->count);
918 919 920 921 922 923 924 925 926

out:
	return ret;

}

static int debug_close(struct inode *inode, struct file *file)
{
	struct debug_buffer *buf = file->private_data;
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928
	if (buf) {
929
		vfree(buf->output_buf);
930 931 932 933 934 935 936 937 938 939 940 941 942 943
		kfree(buf);
	}

	return 0;
}
static int debug_async_open(struct inode *inode, struct file *file)
{
	file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);

	return file->private_data ? 0 : -ENOMEM;
}

static int debug_periodic_open(struct inode *inode, struct file *file)
{
944 945 946 947
	struct debug_buffer *buf;
	buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
	if (!buf)
		return -ENOMEM;
948

949 950 951
	buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
	file->private_data = buf;
	return 0;
952 953 954 955 956 957 958 959 960 961
}

static int debug_registers_open(struct inode *inode, struct file *file)
{
	file->private_data = alloc_buffer(inode->i_private,
					  fill_registers_buffer);

	return file->private_data ? 0 : -ENOMEM;
}

962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049
static int debug_lpm_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

static int debug_lpm_close(struct inode *inode, struct file *file)
{
	return 0;
}

static ssize_t debug_lpm_read(struct file *file, char __user *user_buf,
				   size_t count, loff_t *ppos)
{
	/* TODO: show lpm stats */
	return 0;
}

static ssize_t debug_lpm_write(struct file *file, const char __user *user_buf,
			      size_t count, loff_t *ppos)
{
	struct usb_hcd		*hcd;
	struct ehci_hcd		*ehci;
	char buf[50];
	size_t len;
	u32 temp;
	unsigned long port;
	u32 __iomem	*portsc ;
	u32 params;

	hcd = bus_to_hcd(file->private_data);
	ehci = hcd_to_ehci(hcd);

	len = min(count, sizeof(buf) - 1);
	if (copy_from_user(buf, user_buf, len))
		return -EFAULT;
	buf[len] = '\0';
	if (len > 0 && buf[len - 1] == '\n')
		buf[len - 1] = '\0';

	if (strncmp(buf, "enable", 5) == 0) {
		if (strict_strtoul(buf + 7, 10, &port))
			return -EINVAL;
		params = ehci_readl(ehci, &ehci->caps->hcs_params);
		if (port > HCS_N_PORTS(params)) {
			ehci_dbg(ehci, "ERR: LPM on bad port %lu\n", port);
			return -ENODEV;
		}
		portsc = &ehci->regs->port_status[port-1];
		temp = ehci_readl(ehci, portsc);
		if (!(temp & PORT_DEV_ADDR)) {
			ehci_dbg(ehci, "LPM: no device attached\n");
			return -ENODEV;
		}
		temp |= PORT_LPM;
		ehci_writel(ehci, temp, portsc);
		printk(KERN_INFO "force enable LPM for port %lu\n", port);
	} else if (strncmp(buf, "hird=", 5) == 0) {
		unsigned long hird;
		if (strict_strtoul(buf + 5, 16, &hird))
			return -EINVAL;
		printk(KERN_INFO "setting hird %s %lu\n", buf + 6, hird);
		temp = ehci_readl(ehci, &ehci->regs->command);
		temp &= ~CMD_HIRD;
		temp |= hird << 24;
		ehci_writel(ehci, temp, &ehci->regs->command);
	} else if (strncmp(buf, "disable", 7) == 0) {
		if (strict_strtoul(buf + 8, 10, &port))
			return -EINVAL;
		params = ehci_readl(ehci, &ehci->caps->hcs_params);
		if (port > HCS_N_PORTS(params)) {
			ehci_dbg(ehci, "ERR: LPM off bad port %lu\n", port);
			return -ENODEV;
		}
		portsc = &ehci->regs->port_status[port-1];
		temp = ehci_readl(ehci, portsc);
		if (!(temp & PORT_DEV_ADDR)) {
			ehci_dbg(ehci, "ERR: no device attached\n");
			return -ENODEV;
		}
		temp &= ~PORT_LPM;
		ehci_writel(ehci, temp, portsc);
		printk(KERN_INFO "disabled LPM for port %lu\n", port);
	} else
		return -EOPNOTSUPP;
	return count;
}

1050 1051 1052 1053 1054 1055
static inline void create_debug_files (struct ehci_hcd *ehci)
{
	struct usb_bus *bus = &ehci_to_hcd(ehci)->self;

	ehci->debug_dir = debugfs_create_dir(bus->bus_name, ehci_debug_root);
	if (!ehci->debug_dir)
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
		return;

	if (!debugfs_create_file("async", S_IRUGO, ehci->debug_dir, bus,
						&debug_async_fops))
		goto file_error;

	if (!debugfs_create_file("periodic", S_IRUGO, ehci->debug_dir, bus,
						&debug_periodic_fops))
		goto file_error;

	if (!debugfs_create_file("registers", S_IRUGO, ehci->debug_dir, bus,
						    &debug_registers_fops))
		goto file_error;

1070
	if (!debugfs_create_file("lpm", S_IRUGO|S_IWUSR, ehci->debug_dir, bus,
1071 1072 1073
						    &debug_lpm_fops))
		goto file_error;

1074 1075
	return;

1076 1077
file_error:
	debugfs_remove_recursive(ehci->debug_dir);
1078 1079 1080 1081
}

static inline void remove_debug_files (struct ehci_hcd *ehci)
{
1082
	debugfs_remove_recursive(ehci->debug_dir);
1083 1084 1085
}

#endif /* STUB_DEBUG_FILES */