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 */ 85