usb.h

umon bootloader source code, support mips cpu.

 * @pipe: the endpoint pipe
 * @transfer_buffer: pointer to the transfer buffer
 * @buffer_length: length of the transfer buffer
 * @complete: pointer to the usb_complete_t function
 * @context: what to set the urb context to.
 *
 * Initializes a bulk urb with the proper information needed to submit it
 * to a device.
 */
static inline void usb_fill_bulk_urb (struct urb *urb,
				      struct usb_device *dev,
				      unsigned int pipe,
				      void *transfer_buffer,
				      int buffer_length,
				      usb_complete_t complete,
				      void *context)
{
	spin_lock_init(&urb->lock);
	urb->dev = dev;
	urb->pipe = pipe;
	urb->transfer_buffer = transfer_buffer;
	urb->transfer_buffer_length = buffer_length;
	urb->complete = complete;
	urb->context = context;
}

/**
 * usb_fill_int_urb - macro to help initialize a interrupt urb
 * @urb: pointer to the urb to initialize.
 * @dev: pointer to the struct usb_device for this urb.
 * @pipe: the endpoint pipe
 * @transfer_buffer: pointer to the transfer buffer
 * @buffer_length: length of the transfer buffer
 * @complete: pointer to the usb_complete_t function
 * @context: what to set the urb context to.
 * @interval: what to set the urb interval to, encoded like
 *	the endpoint descriptor's bInterval value.
 *
 * Initializes a interrupt urb with the proper information needed to submit
 * it to a device.
 * Note that high speed interrupt endpoints use a logarithmic encoding of
 * the endpoint interval, and express polling intervals in microframes
 * (eight per millisecond) rather than in frames (one per millisecond).
 */
static inline void usb_fill_int_urb (struct urb *urb,
				     struct usb_device *dev,
				     unsigned int pipe,
				     void *transfer_buffer,
				     int buffer_length,
				     usb_complete_t complete,
				     void *context,
				     int interval)
{
	spin_lock_init(&urb->lock);
	urb->dev = dev;
	urb->pipe = pipe;
	urb->transfer_buffer = transfer_buffer;
	urb->transfer_buffer_length = buffer_length;
	urb->complete = complete;
	urb->context = context;
	if (dev->speed == USB_SPEED_HIGH)
		urb->interval = 1 << (interval - 1);
	else
		urb->interval = interval;
	urb->start_frame = -1;
}

extern void usb_init_urb(struct urb *urb);
extern struct urb *usb_alloc_urb(int iso_packets, int mem_flags);
extern void usb_free_urb(struct urb *urb);
#define usb_put_urb usb_free_urb
extern struct urb *usb_get_urb(struct urb *urb);
extern int usb_submit_urb(struct urb *urb, int mem_flags);
extern int usb_unlink_urb(struct urb *urb);
extern void usb_kill_urb(struct urb *urb);

#define HAVE_USB_BUFFERS
void *usb_buffer_alloc (struct usb_device *dev, size_t size,
	int mem_flags, dma_addr_t *dma);
void usb_buffer_free (struct usb_device *dev, size_t size,
	void *addr, dma_addr_t dma);

#if 0
struct urb *usb_buffer_map (struct urb *urb);
void usb_buffer_dmasync (struct urb *urb);
void usb_buffer_unmap (struct urb *urb);
#endif

struct scatterlist;
int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe,
		struct scatterlist *sg, int nents);
#if 0
void usb_buffer_dmasync_sg (struct usb_device *dev, unsigned pipe,
		struct scatterlist *sg, int n_hw_ents);
#endif
void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe,
		struct scatterlist *sg, int n_hw_ents);

/*-------------------------------------------------------------------*
 *                         SYNCHRONOUS CALL SUPPORT                  *
 *-------------------------------------------------------------------*/

extern int usb_control_msg(struct usb_device *dev, unsigned int pipe,
	__u8 request, __u8 requesttype, __u16 value, __u16 index,
	void *data, __u16 size, int timeout);
extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe,
	void *data, int len, int *actual_length,
	int timeout);

/* selective suspend/resume */
extern int usb_suspend_device(struct usb_device *dev, pm_message_t message);
extern int usb_resume_device(struct usb_device *dev);


/* wrappers around usb_control_msg() for the most common standard requests */
extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype,
	unsigned char descindex, void *buf, int size);
extern int usb_get_status(struct usb_device *dev,
	int type, int target, void *data);
extern int usb_get_string(struct usb_device *dev,
	unsigned short langid, unsigned char index, void *buf, int size);
extern int usb_string(struct usb_device *dev, int index,
	char *buf, size_t size);

/* wrappers that also update important state inside usbcore */
extern int usb_clear_halt(struct usb_device *dev, int pipe);
extern int usb_reset_configuration(struct usb_device *dev);
extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate);

/*
 * timeouts, in milliseconds, used for sending/receiving control messages
 * they typically complete within a few frames (msec) after they're issued
 * USB identifies 5 second timeouts, maybe more in a few cases, and a few
 * slow devices (like some MGE Ellipse UPSes) actually push that limit.
 */
#define USB_CTRL_GET_TIMEOUT	5000
#define USB_CTRL_SET_TIMEOUT	5000


/**
 * struct usb_sg_request - support for scatter/gather I/O
 * @status: zero indicates success, else negative errno
 * @bytes: counts bytes transferred.
 *
 * These requests are initialized using usb_sg_init(), and then are used
 * as request handles passed to usb_sg_wait() or usb_sg_cancel().  Most
 * members of the request object aren't for driver access.
 *
 * The status and bytecount values are valid only after usb_sg_wait()
 * returns.  If the status is zero, then the bytecount matches the total
 * from the request.
 *
 * After an error completion, drivers may need to clear a halt condition
 * on the endpoint.
 */
struct usb_sg_request {
	int			status;
	size_t			bytes;

	/* 
	 * members below are private to usbcore,
	 * and are not provided for driver access!
	 */
	spinlock_t		lock;

	struct usb_device	*dev;
	int			pipe;
	struct scatterlist	*sg;
	int			nents;

	int			entries;
	struct urb		**urbs;

	int			count;
	struct completion	complete;
};

int usb_sg_init (
	struct usb_sg_request	*io,
	struct usb_device	*dev,
	unsigned		pipe, 
	unsigned		period,
	struct scatterlist	*sg,
	int			nents,
	size_t			length,
	int			mem_flags
);
void usb_sg_cancel (struct usb_sg_request *io);
void usb_sg_wait (struct usb_sg_request *io);


/* -------------------------------------------------------------------------- */

/*
 * For various legacy reasons, Linux has a small cookie that's paired with
 * a struct usb_device to identify an endpoint queue.  Queue characteristics
 * are defined by the endpoint's descriptor.  This cookie is called a "pipe",
 * an unsigned int encoded as:
 *
 *  - direction:	bit 7		(0 = Host-to-Device [Out],
 *					 1 = Device-to-Host [In] ...
 *					like endpoint bEndpointAddress)
 *  - device address:	bits 8-14       ... bit positions known to uhci-hcd
 *  - endpoint:		bits 15-18      ... bit positions known to uhci-hcd
 *  - pipe type:	bits 30-31	(00 = isochronous, 01 = interrupt,
 *					 10 = control, 11 = bulk)
 *
 * Given the device address and endpoint descriptor, pipes are redundant.
 */

/* NOTE:  these are not the standard USB_ENDPOINT_XFER_* values!! */
/* (yet ... they're the values used by usbfs) */
#define PIPE_ISOCHRONOUS		0
#define PIPE_INTERRUPT			1
#define PIPE_CONTROL			2
#define PIPE_BULK			3

#define usb_pipein(pipe)	((pipe) & USB_DIR_IN)
#define usb_pipeout(pipe)	(!usb_pipein(pipe))

#define usb_pipedevice(pipe)	(((pipe) >> 8) & 0x7f)
#define usb_pipeendpoint(pipe)	(((pipe) >> 15) & 0xf)

#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)

/* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
#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)))


static inline unsigned int __create_pipe(struct usb_device *dev, unsigned int endpoint)
{
	return (dev->devnum << 8) | (endpoint << 15);
}

/* Create various pipes... */
#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)

/*-------------------------------------------------------------------------*/

static inline __u16
usb_maxpacket(struct usb_device *udev, int pipe, int is_out)
{
	struct usb_host_endpoint	*ep;
	unsigned			epnum = usb_pipeendpoint(pipe);

	if (is_out) {
		WARN_ON(usb_pipein(pipe));
		ep = udev->ep_out[epnum];
	} else {
		WARN_ON(usb_pipeout(pipe));
		ep = udev->ep_in[epnum];
	}
	if (!ep)
		return 0;

	/* NOTE:  only 0x07ff bits are for packet size... */
	return le16_to_cpu(ep->desc.wMaxPacketSize);
}

/* -------------------------------------------------------------------------- */

#ifdef DEBUG
#define dbg(format, arg...) printk(KERN_DEBUG "%s: " format "\n" , __FILE__ , ## arg)
#else
#define dbg(format, arg...) do {} while (0)
#endif

#define err(format, arg...) printk(KERN_ERR "%s: " format "\n" , __FILE__ , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format "\n" , __FILE__ , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n" , __FILE__ , ## arg)


#endif  /* __KERNEL__ */

#endif