/*
   * (C) Copyright 2001
   * Denis Peter, MPL AG Switzerland
   *

   * Adapted for U-Boot driver model
   * (C) Copyright 2015 Google, Inc
   *

   * SPDX-License-Identifier:	GPL-2.0+

   * Note: Part of this code has been derived from linux
   *
   */
  #ifndef _USB_H_
  #define _USB_H_

  #include <fdtdec.h>

  #include <usb_defs.h>

  #include <linux/usb/ch9.h>

  #include <asm/cache.h>
  #include <part.h>

  /*
   * The EHCI spec says that we must align to at least 32 bytes.  However,
   * some platforms require larger alignment.
   */
  #if ARCH_DMA_MINALIGN > 32
  #define USB_DMA_MINALIGN	ARCH_DMA_MINALIGN
  #else
  #define USB_DMA_MINALIGN	32
  #endif

  /* Everything is aribtrary */

  #define USB_ALTSETTINGALLOC		4
  #define USB_MAXALTSETTING		128	/* Hard limit */

  #define USB_MAX_DEVICE			32
  #define USB_MAXCONFIG			8
  #define USB_MAXINTERFACES		8
  #define USB_MAXENDPOINTS		16
  #define USB_MAXCHILDREN			8	/* This is arbitrary */
  #define USB_MAX_HUB			16

  
  #define USB_CNTL_TIMEOUT 100 /* 100ms timeout */

  /*
   * This is the timeout to allow for submitting an urb in ms. We allow more
   * time for a BULK device to react - some are slow.
   */

  #define USB_TIMEOUT_MS(pipe) (usb_pipebulk(pipe) ? 5000 : 1000)

  /* device request (setup) */
  struct devrequest {

  	__u8	requesttype;
  	__u8	request;
  	__le16	value;
  	__le16	index;
  	__le16	length;

  } __attribute__ ((packed));

  /* Interface */
  struct usb_interface {
  	struct usb_interface_descriptor desc;

  	__u8	no_of_ep;
  	__u8	num_altsetting;
  	__u8	act_altsetting;

  	struct usb_endpoint_descriptor ep_desc[USB_MAXENDPOINTS];

  	/*
  	 * Super Speed Device will have Super Speed Endpoint
  	 * Companion Descriptor  (section 9.6.7 of usb 3.0 spec)
  	 * Revision 1.0 June 6th 2011
  	 */
  	struct usb_ss_ep_comp_descriptor ss_ep_comp_desc[USB_MAXENDPOINTS];

  } __attribute__ ((packed));

  /* Configuration information.. */
  struct usb_config {

  	struct usb_config_descriptor desc;

  	__u8	no_of_if;	/* number of interfaces */

  	struct usb_interface if_desc[USB_MAXINTERFACES];

  } __attribute__ ((packed));

  enum {
  	/* Maximum packet size; encoded as 0,1,2,3 = 8,16,32,64 */
  	PACKET_SIZE_8   = 0,
  	PACKET_SIZE_16  = 1,
  	PACKET_SIZE_32  = 2,
  	PACKET_SIZE_64  = 3,
  };

  /**
   * struct usb_device - information about a USB device
   *
   * With driver model both UCLASS_USB (the USB controllers) and UCLASS_USB_HUB
   * (the hubs) have this as parent data. Hubs are children of controllers or
   * other hubs and there is always a single root hub for each controller.
   * Therefore struct usb_device can always be accessed with
   * dev_get_parentdata(dev), where dev is a USB device.
   *
   * Pointers exist for obtaining both the device (could be any uclass) and
   * controller (UCLASS_USB) from this structure. The controller does not have
   * a struct usb_device since it is not a device.
   */

  struct usb_device {

  	int	devnum;			/* Device number on USB bus */

  	int	speed;			/* full/low/high */

  	char	mf[32];			/* manufacturer */
  	char	prod[32];		/* product */
  	char	serial[32];		/* serial number */

  	/* Maximum packet size; one of: PACKET_SIZE_* */
  	int maxpacketsize;
  	/* one bit for each endpoint ([0] = IN, [1] = OUT) */
  	unsigned int toggle[2];

  	/* endpoint halts; one bit per endpoint # & direction;
  	 * [0] = IN, [1] = OUT
  	 */

  	unsigned int halted[2];

  	int epmaxpacketin[16];		/* INput endpoint specific maximums */
  	int epmaxpacketout[16];		/* OUTput endpoint specific maximums */
  
  	int configno;			/* selected config number */

  	/* Device Descriptor */
  	struct usb_device_descriptor descriptor
  		__attribute__((aligned(ARCH_DMA_MINALIGN)));

  	struct usb_config config; /* config descriptor */

  
  	int have_langid;		/* whether string_langid is valid yet */
  	int string_langid;		/* language ID for strings */
  	int (*irq_handle)(struct usb_device *dev);
  	unsigned long irq_status;

  	int irq_act_len;		/* transfered bytes */

  	void *privptr;
  	/*
  	 * Child devices -  if this is a hub device
  	 * Each instance needs its own set of data structures.
  	 */
  	unsigned long status;

  	unsigned long int_pending;	/* 1 bit per ep, used by int_queue */

  	int act_len;			/* transfered bytes */
  	int maxchild;			/* Number of ports if hub */

  	int portnr;			/* Port number, 1=first */
  #ifndef CONFIG_DM_USB
  	/* parent hub, or NULL if this is the root hub */

  	struct usb_device *parent;
  	struct usb_device *children[USB_MAXCHILDREN];

  	void *controller;		/* hardware controller private data */

  #endif

  	/* slot_id - for xHCI enabled devices */
  	unsigned int slot_id;

  #ifdef CONFIG_DM_USB
  	struct udevice *dev;		/* Pointer to associated device */
  	struct udevice *controller_dev;	/* Pointer to associated controller */
  #endif

  };

  struct int_queue;

  /*
   * You can initialize platform's USB host or device
   * ports by passing this enum as an argument to
   * board_usb_init().
   */
  enum usb_init_type {
  	USB_INIT_HOST,
  	USB_INIT_DEVICE
  };

  /**********************************************************************
   * this is how the lowlevel part communicate with the outer world
   */

  #if defined(CONFIG_USB_UHCI) || defined(CONFIG_USB_OHCI) || \

  	defined(CONFIG_USB_EHCI) || defined(CONFIG_USB_OHCI_NEW) || \

  	defined(CONFIG_USB_SL811HS) || defined(CONFIG_USB_ISP116X_HCD) || \

  	defined(CONFIG_USB_R8A66597_HCD) || defined(CONFIG_USB_DAVINCI) || \

  	defined(CONFIG_USB_OMAP3) || defined(CONFIG_USB_DA8XX) || \

  	defined(CONFIG_USB_BLACKFIN) || defined(CONFIG_USB_AM35X) || \

  	defined(CONFIG_USB_MUSB_DSPS) || defined(CONFIG_USB_MUSB_AM35X) || \

  	defined(CONFIG_USB_MUSB_OMAP2PLUS) || defined(CONFIG_USB_MUSB_SUNXI) || \

  	defined(CONFIG_USB_XHCI) || defined(CONFIG_USB_DWC2) || \
  	defined(CONFIG_USB_EMUL)

  int usb_lowlevel_init(int index, enum usb_init_type init, void **controller);

  int usb_lowlevel_stop(int index);

  
  #if defined(CONFIG_MUSB_HOST) || defined(CONFIG_DM_USB)
  int usb_reset_root_port(void);

  #else
  #define usb_reset_root_port()
  #endif

  int submit_bulk_msg(struct usb_device *dev, unsigned long pipe,
  			void *buffer, int transfer_len);

  int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,

  			int transfer_len, struct devrequest *setup);

  int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
  			int transfer_len, int interval);

  #if defined CONFIG_USB_EHCI || defined CONFIG_MUSB_HOST

  struct int_queue *create_int_queue(struct usb_device *dev, unsigned long pipe,

  	int queuesize, int elementsize, void *buffer, int interval);

  int destroy_int_queue(struct usb_device *dev, struct int_queue *queue);
  void *poll_int_queue(struct usb_device *dev, struct int_queue *queue);
  #endif

  /* Defines */

  #define USB_UHCI_VEND_ID	0x8086
  #define USB_UHCI_DEV_ID		0x7112

  /*
   * PXA25x can only act as USB device. There are drivers
   * which works with USB CDC gadgets implementations.
   * Some of them have common routines which can be used
   * in boards init functions e.g. udc_disconnect() used for
   * forced device disconnection from host.
   */
  #elif defined(CONFIG_USB_GADGET_PXA2XX)
  
  extern void udc_disconnect(void);

  #endif

  /*

   * board-specific hardware initialization, called by
   * usb drivers and u-boot commands
   *
   * @param index USB controller number
   * @param init initializes controller as USB host or device
   */

  int board_usb_init(int index, enum usb_init_type init);

  
  /*
   * can be used to clean up after failed USB initialization attempt
   * vide: board_usb_init()
   *
   * @param index USB controller number for selective cleanup

   * @param init usb_init_type passed to board_usb_init()

   */

  int board_usb_cleanup(int index, enum usb_init_type init);

  #ifdef CONFIG_USB_STORAGE
  
  #define USB_MAX_STOR_DEV 5
  block_dev_desc_t *usb_stor_get_dev(int index);
  int usb_stor_scan(int mode);

  int usb_stor_info(void);

  
  #endif

  #ifdef CONFIG_USB_HOST_ETHER
  
  #define USB_MAX_ETH_DEV 5
  int usb_host_eth_scan(int mode);
  
  #endif

  #ifdef CONFIG_USB_KEYBOARD
  
  int drv_usb_kbd_init(void);

  int usb_kbd_deregister(int force);

  
  #endif
  /* routines */
  int usb_init(void); /* initialize the USB Controller */
  int usb_stop(void); /* stop the USB Controller */
  
  
  int usb_set_protocol(struct usb_device *dev, int ifnum, int protocol);

  int usb_set_idle(struct usb_device *dev, int ifnum, int duration,
  			int report_id);

  int usb_control_msg(struct usb_device *dev, unsigned int pipe,
  			unsigned char request, unsigned char requesttype,
  			unsigned short value, unsigned short index,
  			void *data, unsigned short size, int timeout);
  int usb_bulk_msg(struct usb_device *dev, unsigned int pipe,
  			void *data, int len, int *actual_length, int timeout);
  int usb_submit_int_msg(struct usb_device *dev, unsigned long pipe,

  			void *buffer, int transfer_len, int interval);

  int usb_disable_asynch(int disable);

  int usb_maxpacket(struct usb_device *dev, unsigned long pipe);

  int usb_get_configuration_no(struct usb_device *dev, unsigned char *buffer,
  				int cfgno);
  int usb_get_report(struct usb_device *dev, int ifnum, unsigned char type,
  			unsigned char id, void *buf, int size);

  int usb_get_class_descriptor(struct usb_device *dev, int ifnum,

  			unsigned char type, unsigned char id, void *buf,
  			int size);

  int usb_clear_halt(struct usb_device *dev, int pipe);
  int usb_string(struct usb_device *dev, int index, char *buf, size_t size);
  int usb_set_interface(struct usb_device *dev, int interface, int alternate);
  
  /* big endian -> little endian conversion */

  /* some CPUs are already little endian e.g. the ARM920T */

  #define __swap_16(x) \

  	({ unsigned short x_ = (unsigned short)x; \
  	 (unsigned short)( \

  		((x_ & 0x00FFU) << 8) | ((x_ & 0xFF00U) >> 8)); \

  	})

  #define __swap_32(x) \

  	({ unsigned long x_ = (unsigned long)x; \
  	 (unsigned long)( \
  		((x_ & 0x000000FFUL) << 24) | \

  		((x_ & 0x0000FF00UL) <<	 8) | \
  		((x_ & 0x00FF0000UL) >>	 8) | \

  		((x_ & 0xFF000000UL) >> 24)); \

  	})

  #ifdef __LITTLE_ENDIAN

  # define swap_16(x) (x)
  # define swap_32(x) (x)
  #else
  # define swap_16(x) __swap_16(x)
  # define swap_32(x) __swap_32(x)

  #endif

  
  /*
   * Calling this entity a "pipe" is glorifying it. A USB pipe
   * is something embarrassingly simple: it basically consists
   * of the following information:
   *  - device number (7 bits)
   *  - endpoint number (4 bits)
   *  - current Data0/1 state (1 bit)
   *  - direction (1 bit)

   *  - speed (2 bits)

   *  - max packet size (2 bits: 8, 16, 32 or 64)
   *  - pipe type (2 bits: control, interrupt, bulk, isochronous)
   *
   * That's 18 bits. Really. Nothing more. And the USB people have
   * documented these eighteen bits as some kind of glorious
   * virtual data structure.
   *
   * Let's not fall in that trap. We'll just encode it as a simple
   * unsigned int. The encoding is:
   *
   *  - max size:		bits 0-1	(00 = 8, 01 = 16, 10 = 32, 11 = 64)

   *  - direction:	bit 7		(0 = Host-to-Device [Out],
   *					(1 = Device-to-Host [In])

   *  - device:		bits 8-14
   *  - endpoint:		bits 15-18
   *  - Data0/1:		bit 19

   *  - pipe type:	bits 30-31	(00 = isochronous, 01 = interrupt,
   *					 10 = control, 11 = bulk)

   *
   * Why? Because it's arbitrary, and whatever encoding we select is really
   * up to us. This one happens to share a lot of bit positions with the UHCI
   * specification, so that much of the uhci driver can just mask the bits
   * appropriately.
   */
  /* Create various pipes... */
  #define create_pipe(dev,endpoint) \

  		(((dev)->devnum << 8) | ((endpoint) << 15) | \

  		(dev)->maxpacketsize)

  #define default_pipe(dev) ((dev)->speed << 26)

  
  #define usb_sndctrlpipe(dev, endpoint)	((PIPE_CONTROL << 30) | \
  					 create_pipe(dev, endpoint))
  #define usb_rcvctrlpipe(dev, endpoint)	((PIPE_CONTROL << 30) | \
  					 create_pipe(dev, endpoint) | \
  					 USB_DIR_IN)
  #define usb_sndisocpipe(dev, endpoint)	((PIPE_ISOCHRONOUS << 30) | \
  					 create_pipe(dev, endpoint))
  #define usb_rcvisocpipe(dev, endpoint)	((PIPE_ISOCHRONOUS << 30) | \
  					 create_pipe(dev, endpoint) | \
  					 USB_DIR_IN)
  #define usb_sndbulkpipe(dev, endpoint)	((PIPE_BULK << 30) | \
  					 create_pipe(dev, endpoint))
  #define usb_rcvbulkpipe(dev, endpoint)	((PIPE_BULK << 30) | \
  					 create_pipe(dev, endpoint) | \
  					 USB_DIR_IN)
  #define usb_sndintpipe(dev, endpoint)	((PIPE_INTERRUPT << 30) | \
  					 create_pipe(dev, endpoint))
  #define usb_rcvintpipe(dev, endpoint)	((PIPE_INTERRUPT << 30) | \
  					 create_pipe(dev, endpoint) | \
  					 USB_DIR_IN)
  #define usb_snddefctrl(dev)		((PIPE_CONTROL << 30) | \
  					 default_pipe(dev))
  #define usb_rcvdefctrl(dev)		((PIPE_CONTROL << 30) | \
  					 default_pipe(dev) | \
  					 USB_DIR_IN)

  
  /* The D0/D1 toggle bits */
  #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> ep) & 1)

  #define usb_dotoggle(dev, ep, out)  ((dev)->toggle[out] ^= (1 << ep))

  #define usb_settoggle(dev, ep, out, bit) ((dev)->toggle[out] = \
  						((dev)->toggle[out] & \
  						 ~(1 << ep)) | ((bit) << ep))

  
  /* Endpoint halt control/status */
  #define usb_endpoint_out(ep_dir)	(((ep_dir >> 7) & 1) ^ 1)
  #define usb_endpoint_halt(dev, ep, out) ((dev)->halted[out] |= (1 << (ep)))
  #define usb_endpoint_running(dev, ep, out) ((dev)->halted[out] &= ~(1 << (ep)))
  #define usb_endpoint_halted(dev, ep, out) ((dev)->halted[out] & (1 << (ep)))

  #define usb_packetid(pipe)	(((pipe) & USB_DIR_IN) ? USB_PID_IN : \
  				 USB_PID_OUT)

  
  #define usb_pipeout(pipe)	((((pipe) >> 7) & 1) ^ 1)
  #define usb_pipein(pipe)	(((pipe) >> 7) & 1)
  #define usb_pipedevice(pipe)	(((pipe) >> 8) & 0x7f)
  #define usb_pipe_endpdev(pipe)	(((pipe) >> 8) & 0x7ff)
  #define usb_pipeendpoint(pipe)	(((pipe) >> 15) & 0xf)
  #define usb_pipedata(pipe)	(((pipe) >> 19) & 1)

  #define usb_pipetype(pipe)	(((pipe) >> 30) & 3)
  #define usb_pipeisoc(pipe)	(usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
  #define usb_pipeint(pipe)	(usb_pipetype((pipe)) == PIPE_INTERRUPT)
  #define usb_pipecontrol(pipe)	(usb_pipetype((pipe)) == PIPE_CONTROL)
  #define usb_pipebulk(pipe)	(usb_pipetype((pipe)) == PIPE_BULK)

  #define usb_pipe_ep_index(pipe)	\
  		usb_pipecontrol(pipe) ? (usb_pipeendpoint(pipe) * 2) : \
  				((usb_pipeendpoint(pipe) * 2) - \
  				 (usb_pipein(pipe) ? 0 : 1))

  /**
   * struct usb_device_id - identifies USB devices for probing and hotplugging
   * @match_flags: Bit mask controlling which of the other fields are used to
   *	match against new devices. Any field except for driver_info may be
   *	used, although some only make sense in conjunction with other fields.
   *	This is usually set by a USB_DEVICE_*() macro, which sets all
   *	other fields in this structure except for driver_info.
   * @idVendor: USB vendor ID for a device; numbers are assigned
   *	by the USB forum to its members.
   * @idProduct: Vendor-assigned product ID.
   * @bcdDevice_lo: Low end of range of vendor-assigned product version numbers.
   *	This is also used to identify individual product versions, for
   *	a range consisting of a single device.
   * @bcdDevice_hi: High end of version number range.  The range of product
   *	versions is inclusive.
   * @bDeviceClass: Class of device; numbers are assigned
   *	by the USB forum.  Products may choose to implement classes,
   *	or be vendor-specific.  Device classes specify behavior of all
   *	the interfaces on a device.
   * @bDeviceSubClass: Subclass of device; associated with bDeviceClass.
   * @bDeviceProtocol: Protocol of device; associated with bDeviceClass.
   * @bInterfaceClass: Class of interface; numbers are assigned
   *	by the USB forum.  Products may choose to implement classes,
   *	or be vendor-specific.  Interface classes specify behavior only
   *	of a given interface; other interfaces may support other classes.
   * @bInterfaceSubClass: Subclass of interface; associated with bInterfaceClass.
   * @bInterfaceProtocol: Protocol of interface; associated with bInterfaceClass.
   * @bInterfaceNumber: Number of interface; composite devices may use
   *	fixed interface numbers to differentiate between vendor-specific
   *	interfaces.
   * @driver_info: Holds information used by the driver.  Usually it holds
   *	a pointer to a descriptor understood by the driver, or perhaps
   *	device flags.
   *
   * In most cases, drivers will create a table of device IDs by using
   * USB_DEVICE(), or similar macros designed for that purpose.
   * They will then export it to userspace using MODULE_DEVICE_TABLE(),
   * and provide it to the USB core through their usb_driver structure.
   *
   * See the usb_match_id() function for information about how matches are
   * performed.  Briefly, you will normally use one of several macros to help
   * construct these entries.  Each entry you provide will either identify
   * one or more specific products, or will identify a class of products
   * which have agreed to behave the same.  You should put the more specific
   * matches towards the beginning of your table, so that driver_info can
   * record quirks of specific products.
   */
  struct usb_device_id {
  	/* which fields to match against? */
  	u16 match_flags;
  
  	/* Used for product specific matches; range is inclusive */
  	u16 idVendor;
  	u16 idProduct;
  	u16 bcdDevice_lo;
  	u16 bcdDevice_hi;
  
  	/* Used for device class matches */
  	u8 bDeviceClass;
  	u8 bDeviceSubClass;
  	u8 bDeviceProtocol;
  
  	/* Used for interface class matches */
  	u8 bInterfaceClass;
  	u8 bInterfaceSubClass;
  	u8 bInterfaceProtocol;
  
  	/* Used for vendor-specific interface matches */
  	u8 bInterfaceNumber;
  
  	/* not matched against */
  	ulong driver_info;
  };
  
  /* Some useful macros to use to create struct usb_device_id */
  #define USB_DEVICE_ID_MATCH_VENDOR		0x0001
  #define USB_DEVICE_ID_MATCH_PRODUCT		0x0002
  #define USB_DEVICE_ID_MATCH_DEV_LO		0x0004
  #define USB_DEVICE_ID_MATCH_DEV_HI		0x0008
  #define USB_DEVICE_ID_MATCH_DEV_CLASS		0x0010
  #define USB_DEVICE_ID_MATCH_DEV_SUBCLASS	0x0020
  #define USB_DEVICE_ID_MATCH_DEV_PROTOCOL	0x0040
  #define USB_DEVICE_ID_MATCH_INT_CLASS		0x0080
  #define USB_DEVICE_ID_MATCH_INT_SUBCLASS	0x0100
  #define USB_DEVICE_ID_MATCH_INT_PROTOCOL	0x0200
  #define USB_DEVICE_ID_MATCH_INT_NUMBER		0x0400
  
  /* Match anything, indicates this is a valid entry even if everything is 0 */
  #define USB_DEVICE_ID_MATCH_NONE		0x0800
  #define USB_DEVICE_ID_MATCH_ALL			0x07ff
  
  /**
   * struct usb_driver_entry - Matches a driver to its usb_device_ids
   * @compatible: Compatible string
   * @data: Data for this compatible string
   */
  struct usb_driver_entry {
  	struct driver *driver;
  	const struct usb_device_id *match;
  };
  
  #define USB_DEVICE(__name, __match)					\
  	ll_entry_declare(struct usb_driver_entry, __name, usb_driver_entry) = {\
  		.driver = llsym(struct driver, __name, driver), \
  		.match = __match, \
  		}

  /*************************************************************************
   * Hub Stuff
   */
  struct usb_port_status {
  	unsigned short wPortStatus;
  	unsigned short wPortChange;
  } __attribute__ ((packed));
  
  struct usb_hub_status {
  	unsigned short wHubStatus;
  	unsigned short wHubChange;
  } __attribute__ ((packed));
  
  
  /* Hub descriptor */
  struct usb_hub_descriptor {
  	unsigned char  bLength;
  	unsigned char  bDescriptorType;
  	unsigned char  bNbrPorts;
  	unsigned short wHubCharacteristics;
  	unsigned char  bPwrOn2PwrGood;
  	unsigned char  bHubContrCurrent;
  	unsigned char  DeviceRemovable[(USB_MAXCHILDREN+1+7)/8];
  	unsigned char  PortPowerCtrlMask[(USB_MAXCHILDREN+1+7)/8];

  	/* DeviceRemovable and PortPwrCtrlMask want to be variable-length

  	   bitmaps that hold max 255 entries. (bit0 is ignored) */
  } __attribute__ ((packed));
  
  
  struct usb_hub_device {
  	struct usb_device *pusb_dev;
  	struct usb_hub_descriptor desc;
  };

  #ifdef CONFIG_DM_USB
  /**
   * struct usb_platdata - Platform data about a USB controller
   *
   * Given a USB controller (UCLASS_USB) dev this is dev_get_platdata(dev)
   */
  struct usb_platdata {
  	enum usb_init_type init_type;
  };
  
  /**
   * struct usb_dev_platdata - Platform data about a USB device
   *
   * Given a USB device dev this structure is dev_get_parent_platdata(dev).
   * This is used by sandbox to provide emulation data also.
   *
   * @id:		ID used to match this device
   * @speed:	Stores the speed associated with a USB device
   * @devnum:	Device address on the USB bus
   * @slot_id:	USB3 slot ID, which is separate from the device address
   * @portnr:	Port number of this device on its parent hub, numbered from 1
   *		(0 mean this device is the root hub)
   * @strings:	List of descriptor strings (for sandbox emulation purposes)
   * @desc_list:	List of descriptors (for sandbox emulation purposes)
   */
  struct usb_dev_platdata {
  	struct usb_device_id id;
  	enum usb_device_speed speed;
  	int devnum;
  	int slot_id;
  	int portnr;	/* Hub port number, 1..n */
  #ifdef CONFIG_SANDBOX
  	struct usb_string *strings;
  	/* NULL-terminated list of descriptor pointers */
  	struct usb_generic_descriptor **desc_list;
  #endif
  	int configno;
  };
  
  /**
   * struct usb_bus_priv - information about the USB controller
   *
   * Given a USB controller (UCLASS_USB) 'dev', this is
   * dev_get_uclass_priv(dev).
   *
   * @next_addr:	Next device address to allocate minus 1. Incremented by 1
   *		each time a new device address is set, so this holds the
   *		number of devices on the bus
   * @desc_before_addr:	true if we can read a device descriptor before it
   *		has been assigned an address. For XHCI this is not possible
   *		so this will be false.
   */
  struct usb_bus_priv {
  	int next_addr;
  	bool desc_before_addr;
  };
  
  /**
   * struct dm_usb_ops - USB controller operations
   *
   * This defines the operations supoorted on a USB controller. Common
   * arguments are:
   *
   * @bus:	USB bus (i.e. controller), which is in UCLASS_USB.
   * @udev:	USB device parent data. Controllers are not expected to need
   *		this, since the device address on the bus is encoded in @pipe.
   *		It is used for sandbox, and can be handy for debugging and
   *		logging.
   * @pipe:	An assortment of bitfields which provide address and packet
   *		type information. See create_pipe() above for encoding
   *		details
   * @buffer:	A buffer to use for sending/receiving. This should be
   *		DMA-aligned.
   * @length:	Buffer length in bytes
   */
  struct dm_usb_ops {
  	/**
  	 * control() - Send a control message
  	 *
  	 * Most parameters are as above.
  	 *
  	 * @setup: Additional setup information required by the message
  	 */
  	int (*control)(struct udevice *bus, struct usb_device *udev,
  		       unsigned long pipe, void *buffer, int length,
  		       struct devrequest *setup);
  	/**
  	 * bulk() - Send a bulk message
  	 *
  	 * Parameters are as above.
  	 */
  	int (*bulk)(struct udevice *bus, struct usb_device *udev,
  		    unsigned long pipe, void *buffer, int length);
  	/**
  	 * interrupt() - Send an interrupt message
  	 *
  	 * Most parameters are as above.
  	 *
  	 * @interval: Interrupt interval
  	 */
  	int (*interrupt)(struct udevice *bus, struct usb_device *udev,
  			 unsigned long pipe, void *buffer, int length,
  			 int interval);
  	/**
  	 * alloc_device() - Allocate a new device context (XHCI)
  	 *
  	 * Before sending packets to a new device on an XHCI bus, a device
  	 * context must be created. If this method is not NULL it will be
  	 * called before the device is enumerated (even before its descriptor
  	 * is read). This should be NULL for EHCI, which does not need this.
  	 */
  	int (*alloc_device)(struct udevice *bus, struct usb_device *udev);
  };
  
  #define usb_get_ops(dev)	((struct dm_usb_ops *)(dev)->driver->ops)
  #define usb_get_emul_ops(dev)	((struct dm_usb_ops *)(dev)->driver->ops)
  
  #ifdef CONFIG_MUSB_HOST
  int usb_reset_root_port(void);
  #endif
  
  /**
   * usb_get_dev_index() - look up a device index number
   *
   * Look up devices using their index number (starting at 0). This works since
   * in U-Boot device addresses are allocated starting at 1 with no gaps.
   *
   * TODO(sjg@chromium.org): Remove this function when usb_ether.c is modified
   * to work better with driver model.
   *
   * @bus:	USB bus to check
   * @index:	Index number of device to find (0=first). This is just the
   *		device address less 1.
   */
  struct usb_device *usb_get_dev_index(struct udevice *bus, int index);
  
  /**
   * usb_legacy_port_reset() - Legacy function to reset a hub port
   *
   * @hub:	Hub device
   * @portnr:	Port number (1=first)
   */
  int usb_legacy_port_reset(struct usb_device *hub, int portnr);
  
  /**
   * usb_setup_device() - set up a device ready for use
   *
   * @dev:	USB device pointer. This need not be a real device - it is
   *		common for it to just be a local variable with its ->dev
   *		member (i.e. @dev->dev) set to the parent device
   * @do_read:	true to read the device descriptor before an address is set
   *		(should be false for XHCI buses, true otherwise)
   * @parent:	Parent device (either UCLASS_USB or UCLASS_USB_HUB)
   * @portnr:	Port number on hub (1=first) or 0 for none
   * @return 0 if OK, -ve on error */
  int usb_setup_device(struct usb_device *dev, bool do_read,
  		     struct usb_device *parent, int portnr);
  
  /**
   * usb_hub_scan() - Scan a hub and find its devices
   *
   * @hub:	Hub device to scan
   */
  int usb_hub_scan(struct udevice *hub);
  
  /**
   * usb_scan_device() - Scan a device on a bus
   *
   * Scan a device on a bus. It has already been detected and is ready to
   * be enumerated. This may be either the root hub (@parent is a bus) or a
   * normal device (@parent is a hub)
   *
   * @parent:	Parent device
   * @port:	Hub port number (numbered from 1)
   * @speed:	USB speed to use for this device
   * @devp:	Returns pointer to device if all is well
   * @return 0 if OK, -ve on error
   */
  int usb_scan_device(struct udevice *parent, int port,
  		    enum usb_device_speed speed, struct udevice **devp);
  
  /**
   * usb_get_bus() - Find the bus for a device
   *
   * Search up through parents to find the bus this device is connected to. This
   * will be a device with uclass UCLASS_USB.
   *
   * @dev:	Device to check
   * @busp:	Returns bus, or NULL if not found
   * @return 0 if OK, -EXDEV is somehow this bus does not have a controller (this
   *	indicates a critical error in the USB stack
   */
  int usb_get_bus(struct udevice *dev, struct udevice **busp);
  
  /**
   * usb_select_config() - Set up a device ready for use
   *
   * This function assumes that the device already has an address and a driver
   * bound, and is ready to be set up.
   *
   * This re-reads the device and configuration descriptors and sets the
   * configuration
   *
   * @dev:	Device to set up
   */
  int usb_select_config(struct usb_device *dev);
  
  /**
   * usb_child_pre_probe() - Pre-probe function for USB devices
   *
   * This is called on all children of hubs and USB controllers (i.e. UCLASS_USB
   * and UCLASS_USB_HUB) when a new device is about to be probed. It sets up the
   * device from the saved platform data and calls usb_select_config() to
   * finish set up.
   *
   * Once this is done, the device's normal driver can take over, knowing the
   * device is accessible on the USB bus.
   *
   * This function is for use only by the internal USB stack.
   *
   * @dev:	Device to set up
   */
  int usb_child_pre_probe(struct udevice *dev);
  
  struct ehci_ctrl;
  
  /**
   * usb_setup_ehci_gadget() - Set up a USB device as a gadget
   *
   * TODO(sjg@chromium.org): Tidy this up when USB gadgets can use driver model
   *
   * This provides a way to tell a controller to start up as a USB device
   * instead of as a host. It is untested.
   */
  int usb_setup_ehci_gadget(struct ehci_ctrl **ctlrp);
  
  /**
   * usb_stor_reset() - Prepare to scan USB storage devices
   *
   * Empty the list of USB storage devices in preparation for scanning them.
   * This must be called before a USB scan.
   */
  void usb_stor_reset(void);
  
  #else /* !CONFIG_DM_USB */
  
  struct usb_device *usb_get_dev_index(int index);
  
  #endif
  
  bool usb_device_has_child_on_port(struct usb_device *parent, int port);

  int usb_hub_probe(struct usb_device *dev, int ifnum);
  void usb_hub_reset(void);

  
  /**
   * legacy_hub_port_reset() - reset a port given its usb_device pointer
   *
   * Reset a hub port and see if a device is present on that port, providing
   * sufficient time for it to show itself. The port status is returned.
   *
   * With driver model this moves to hub_port_reset() and is passed a struct
   * udevice.
   *
   * @dev:	USB device to reset
   * @port:	Port number to reset (note ports are numbered from 0 here)
   * @portstat:	Returns port status
   */
  int legacy_hub_port_reset(struct usb_device *dev, int port,

  			  unsigned short *portstat);

  int hub_port_reset(struct udevice *dev, int port, unsigned short *portstat);

  /**
   * usb_alloc_new_device() - Allocate a new device
   *
   * @devp: returns a pointer of a new device structure. With driver model this
   *		is a device pointer, but with legacy USB this pointer is
   *		driver-specific.
   * @return 0 if OK, -ENOSPC if we have found out of room for new devices
   */
  int usb_alloc_new_device(struct udevice *controller, struct usb_device **devp);
  
  /**
   * usb_free_device() - Free a partially-inited device
   *
   * This is an internal function. It is used to reverse the action of
   * usb_alloc_new_device() when we hit a problem during init.
   */
  void usb_free_device(struct udevice *controller);

  int usb_new_device(struct usb_device *dev);

  int usb_alloc_device(struct usb_device *dev);

  /**
   * usb_emul_setup_device() - Set up a new USB device emulation
   *
   * This is normally called when a new emulation device is bound. It tells
   * the USB emulation uclass about the features of the emulator.
   *
   * @dev:		Emulation device
   * @maxpacketsize:	Maximum packet size (e.g. PACKET_SIZE_64)
   * @strings:		List of USB string descriptors, terminated by a NULL
   *			entry
   * @desc_list:		List of points or USB descriptors, terminated by NULL.
   *			The first entry must be struct usb_device_descriptor,
   *			and others follow on after that.
   * @return 0 if OK, -ve on error
   */
  int usb_emul_setup_device(struct udevice *dev, int maxpacketsize,
  			  struct usb_string *strings, void **desc_list);
  
  /**
   * usb_emul_control() - Send a control packet to an emulator
   *
   * @emul:	Emulator device
   * @udev:	USB device (which the emulator is causing to appear)
   * See struct dm_usb_ops for details on other parameters
   * @return 0 if OK, -ve on error
   */
  int usb_emul_control(struct udevice *emul, struct usb_device *udev,
  		     unsigned long pipe, void *buffer, int length,
  		     struct devrequest *setup);
  
  /**
   * usb_emul_bulk() - Send a bulk packet to an emulator
   *
   * @emul:	Emulator device
   * @udev:	USB device (which the emulator is causing to appear)
   * See struct dm_usb_ops for details on other parameters
   * @return 0 if OK, -ve on error
   */
  int usb_emul_bulk(struct udevice *emul, struct usb_device *udev,
  		  unsigned long pipe, void *buffer, int length);
  
  /**
   * usb_emul_find() - Find an emulator for a particular device
   *
   * Check @pipe to find a device number on bus @bus and return it.
   *
   * @bus:	USB bus (controller)
   * @pipe:	Describes pipe being used, and includes the device number
   * @emulp:	Returns pointer to emulator, or NULL if not found
   * @return 0 if found, -ve on error
   */
  int usb_emul_find(struct udevice *bus, ulong pipe, struct udevice **emulp);
  
  /**
   * usb_emul_reset() - Reset all emulators ready for use
   *
   * Clear out any address information in the emulators and make then ready for
   * a new USB scan
   */
  void usb_emul_reset(struct udevice *dev);

  #endif /*_USB_H_ */