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  */
  24 struct 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
  47 extern int early_dbgp_init(char *s);
  48 extern struct console early_dbgp_console;
  49 #endif /* CONFIG_EARLY_PRINTK_DBGP */
  50
  51 struct usb_hcd;
  52
  53 #ifdef CONFIG_XEN_DOM0
  54 extern int xen_dbgp_reset_prep(struct usb_hcd *);
  55 extern int xen_dbgp_external_startup(struct usb_hcd *);
  56 #else
  57 static inline int xen_dbgp_reset_prep(struct usb_hcd *hcd)
  58 {
  59         return 1; /* Shouldn't this be 0? */
  60 }
  61
  62 static 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 */
  70 extern int dbgp_external_startup(struct usb_hcd *);
  71 extern int dbgp_reset_prep(struct usb_hcd *);
  72 #else
  73 static inline int dbgp_reset_prep(struct usb_hcd *hcd)
  74 {
  75         return xen_dbgp_reset_prep(hcd);
  76 }
  77
  78 static 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 */