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freebsd/sys/dev/usb/usb_transfer.h
Hans Petter Selasky 9c7e90ba9d This commit marks the beginning of a new internal USB 
transfer statemachine. This work is about using a single
state variable instead of multiple state bits as input
for the USB statemachine to determine what to do in the
various parts of the code. No APIs towards USB device
drivers or USB host controller drivers will be changed.

MFC after:	1 month
2011-11-28 09:54:41 +00:00

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/* $FreeBSD$ */
/*-
* Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _USB_TRANSFER_H_
#define _USB_TRANSFER_H_
/*
* Definition of internal USB transfer states:
* ===========================================
*
* The main reason there are many USB states is that we are allowed to
* cancel USB transfers, then start the USB transfer again and that
* this state transaction cannot always be done in a single atomic
* operation without blocking the calling thread. One reason for this
* is that the USB hardware sometimes needs to wait for DMA
* controllers to finish which is done asynchronously and grows the
* statemachine.
*
* When extending the following statemachine there are basically two
* things you should think about: Which states should be executed or
* modified in case of USB transfer stop and which states should be
* executed or modified in case of USB transfer start. Also respect
* the "can_cancel_immed" flag which basically tells if you can go
* directly from a wait state to the cancelling states.
*/
enum {
/* XFER start execute state */
/* USB_ST_SETUP = 0 (already defined) */
/* XFER transferred execute state */
/* USB_ST_TRANSFERRED = 1 (already defined) */
/* XFER error execute state */
/* USB_ST_ERROR = 2 (already defined) */
/* XFER restart after error execute state */
USB_ST_RESTART = 8,
/* XFER transfer idle state */
USB_ST_WAIT_SETUP,
/* Other XFER execute states */
USB_ST_PIPE_OPEN = 16,
USB_ST_PIPE_OPEN_ERROR,
USB_ST_PIPE_OPEN_RESTART,
USB_ST_BDMA_LOAD,
USB_ST_BDMA_LOAD_ERROR,
USB_ST_BDMA_LOAD_RESTART,
USB_ST_IVAL_DLY,
USB_ST_IVAL_DLY_ERROR,
USB_ST_IVAL_DLY_RESTART,
USB_ST_PIPE_STALL,
USB_ST_PIPE_STALL_ERROR,
USB_ST_PIPE_STALL_RESTART,
USB_ST_ENTER,
USB_ST_ENTER_ERROR,
USB_ST_ENTER_RESTART,
USB_ST_START,
USB_ST_START_ERROR,
USB_ST_START_RESTART,
USB_ST_PIPE_CLOSE,
USB_ST_PIPE_CLOSE_ERROR,
USB_ST_PIPE_CLOSE_RESTART,
USB_ST_BDMA_DLY,
USB_ST_BDMA_DLY_ERROR,
USB_ST_BDMA_DLY_RESTART,
/* XFER transfer wait states */
USB_ST_WAIT_PIPE_OPEN = 64,
USB_ST_WAIT_PIPE_OPEN_ERROR,
USB_ST_WAIT_PIPE_OPEN_RESTART,
USB_ST_WAIT_BDMA_LOAD,
USB_ST_WAIT_BDMA_LOAD_ERROR,
USB_ST_WAIT_BDMA_LOAD_RESTART,
USB_ST_WAIT_IVAL_DLY,
USB_ST_WAIT_IVAL_DLY_ERROR,
USB_ST_WAIT_IVAL_DLY_RESTART,
USB_ST_WAIT_PIPE_STALL,
USB_ST_WAIT_PIPE_STALL_ERROR,
USB_ST_WAIT_PIPE_STALL_RESTART,
USB_ST_WAIT_ENTER,
USB_ST_WAIT_ENTER_ERROR,
USB_ST_WAIT_ENTER_RESTART,
USB_ST_WAIT_START,
USB_ST_WAIT_START_ERROR,
USB_ST_WAIT_START_RESTART,
USB_ST_WAIT_PIPE_CLOSE,
USB_ST_WAIT_PIPE_CLOSE_ERROR,
USB_ST_WAIT_PIPE_CLOSE_RESTART,
USB_ST_WAIT_BDMA_DLY,
USB_ST_WAIT_BDMA_DLY_ERROR,
USB_ST_WAIT_BDMA_DLY_RESTART,
USB_ST_WAIT_TRANSFERRED,
USB_ST_WAIT_TRANSFERRED_ERROR,
USB_ST_WAIT_TRANSFERRED_RESTART,
};
/*
* The following structure defines the messages that is used to signal
* the "done_p" USB process.
*/
struct usb_done_msg {
struct usb_proc_msg hdr;
struct usb_xfer_root *xroot;
};
#define USB_DMATAG_TO_XROOT(dpt) \
((struct usb_xfer_root *)( \
((uint8_t *)(dpt)) - \
((uint8_t *)&((struct usb_xfer_root *)0)->dma_parent_tag)))
/*
* The following structure is used to keep information about memory
* that should be automatically freed at the moment all USB transfers
* have been freed.
*/
struct usb_xfer_root {
struct usb_dma_parent_tag dma_parent_tag;
#if USB_HAVE_BUSDMA
struct usb_xfer_queue dma_q;
#endif
struct usb_xfer_queue done_q;
struct usb_done_msg done_m[2];
struct cv cv_drain;
struct usb_process *done_p; /* pointer to callback process */
void *memory_base;
struct mtx *xfer_mtx; /* cannot be changed during operation */
#if USB_HAVE_BUSDMA
struct usb_page_cache *dma_page_cache_start;
struct usb_page_cache *dma_page_cache_end;
#endif
struct usb_page_cache *xfer_page_cache_start;
struct usb_page_cache *xfer_page_cache_end;
struct usb_bus *bus; /* pointer to USB bus (cached) */
struct usb_device *udev; /* pointer to USB device */
usb_size_t memory_size;
usb_size_t setup_refcount;
#if USB_HAVE_BUSDMA
usb_frcount_t dma_nframes; /* number of page caches to load */
usb_frcount_t dma_currframe; /* currect page cache number */
usb_frlength_t dma_frlength_0; /* length of page cache zero */
uint8_t dma_error; /* set if virtual memory could not be
* loaded */
#endif
uint8_t done_sleep; /* set if done thread is sleeping */
};
/*
* The following structure is used when setting up an array of USB
* transfers.
*/
struct usb_setup_params {
struct usb_dma_tag *dma_tag_p;
struct usb_page *dma_page_ptr;
struct usb_page_cache *dma_page_cache_ptr; /* these will be
* auto-freed */
struct usb_page_cache *xfer_page_cache_ptr; /* these will not be
* auto-freed */
struct usb_device *udev;
struct usb_xfer *curr_xfer;
const struct usb_config *curr_setup;
const struct usb_pipe_methods *methods;
void *buf;
usb_frlength_t *xfer_length_ptr;
usb_size_t size[7];
usb_frlength_t bufsize;
usb_frlength_t bufsize_max;
uint32_t hc_max_frame_size;
uint16_t hc_max_packet_size;
uint8_t hc_max_packet_count;
enum usb_dev_speed speed;
uint8_t dma_tag_max;
usb_error_t err;
};
/* function prototypes */
uint8_t usbd_transfer_setup_sub_malloc(struct usb_setup_params *parm,
struct usb_page_cache **ppc, usb_size_t size, usb_size_t align,
usb_size_t count);
void usb_dma_delay_done_cb(struct usb_xfer *);
void usb_command_wrapper(struct usb_xfer_queue *pq,
struct usb_xfer *xfer);
void usbd_pipe_enter(struct usb_xfer *xfer);
void usbd_pipe_start(struct usb_xfer_queue *pq);
void usbd_transfer_dequeue(struct usb_xfer *xfer);
void usbd_transfer_done(struct usb_xfer *xfer, usb_error_t error);
void usbd_transfer_enqueue(struct usb_xfer_queue *pq,
struct usb_xfer *xfer);
void usbd_transfer_setup_sub(struct usb_setup_params *parm);
void usbd_ctrl_transfer_setup(struct usb_device *udev);
void usbd_clear_stall_locked(struct usb_device *udev,
struct usb_endpoint *ep);
void usbd_clear_data_toggle(struct usb_device *udev,
struct usb_endpoint *ep);
usb_callback_t usbd_do_request_callback;
usb_callback_t usb_handle_request_callback;
usb_callback_t usb_do_clear_stall_callback;
void usbd_transfer_timeout_ms(struct usb_xfer *xfer,
void (*cb) (void *arg), usb_timeout_t ms);
usb_timeout_t usbd_get_dma_delay(struct usb_device *udev);
void usbd_transfer_power_ref(struct usb_xfer *xfer, int val);
#endif /* _USB_TRANSFER_H_ */
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