1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Standalone EHCI usb debug driver
4 *
5 * Originally written by:
6 * Eric W. Biederman" <ebiederm@xmission.com> and
7 * Yinghai Lu <yhlu.kernel@gmail.com>
8 *
9 * Changes for early/late printk and HW errata:
10 * Jason Wessel <jason.wessel@windriver.com>
11 * Copyright (C) 2009 Wind River Systems, Inc.
12 *
13 */
14
15#ifndef __LINUX_USB_EHCI_DBGP_H
16#define __LINUX_USB_EHCI_DBGP_H
17
18#include <linux/console.h>
19#include <linux/types.h>
20
21/* Appendix C, Debug port ... intended for use with special "debug devices"
22 * that can help if there's no serial console. (nonstandard enumeration.)
23 */
24struct ehci_dbg_port {
25 u32 control;
26#define DBGP_OWNER (1<<30)
27#define DBGP_ENABLED (1<<28)
28#define DBGP_DONE (1<<16)
29#define DBGP_INUSE (1<<10)
30#define DBGP_ERRCODE(x) (((x)>>7)&0x07)
31# define DBGP_ERR_BAD 1
32# define DBGP_ERR_SIGNAL 2
33#define DBGP_ERROR (1<<6)
34#define DBGP_GO (1<<5)
35#define DBGP_OUT (1<<4)
36#define DBGP_LEN(x) (((x)>>0)&0x0f)
37 u32 pids;
38#define DBGP_PID_GET(x) (((x)>>16)&0xff)
39#define DBGP_PID_SET(data, tok) (((data)<<8)|(tok))
40 u32 data03;
41 u32 data47;
42 u32 address;
43#define DBGP_EPADDR(dev, ep) (((dev)<<8)|(ep))
44};
45
46#ifdef CONFIG_EARLY_PRINTK_DBGP
47extern int early_dbgp_init(char *s);
48extern struct console early_dbgp_console;
49#endif /* CONFIG_EARLY_PRINTK_DBGP */
50
51struct usb_hcd;
52
53#ifdef CONFIG_XEN_DOM0
54extern int xen_dbgp_reset_prep(struct usb_hcd *);
55extern int xen_dbgp_external_startup(struct usb_hcd *);
56#else
57static inline int xen_dbgp_reset_prep(struct usb_hcd *hcd)
58{
59 return 1; /* Shouldn't this be 0? */
60}
61
62static inline int xen_dbgp_external_startup(struct usb_hcd *hcd)
63{
64 return -1;
65}
66#endif
67
68#ifdef CONFIG_EARLY_PRINTK_DBGP
69/* Call backs from ehci host driver to ehci debug driver */
70extern int dbgp_external_startup(struct usb_hcd *);
71extern int dbgp_reset_prep(struct usb_hcd *);
72#else
73static inline int dbgp_reset_prep(struct usb_hcd *hcd)
74{
75 return xen_dbgp_reset_prep(hcd);
76}
77
78static inline int dbgp_external_startup(struct usb_hcd *hcd)
79{
80 return xen_dbgp_external_startup(hcd);
81}
82#endif
83
84#endif /* __LINUX_USB_EHCI_DBGP_H */
85