LXR linux/include/linux/usb/ehci-dbgp.h

   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