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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_BUSDMA_H_
#define _USB_BUSDMA_H_
#include <sys/uio.h>
#include <sys/mbuf.h>
#include <machine/bus.h>
/* defines */
#define USB_PAGE_SIZE PAGE_SIZE /* use system PAGE_SIZE */
#if (__FreeBSD_version >= 700020)
#define USB_GET_DMA_TAG(dev) bus_get_dma_tag(dev)
#else
#define USB_GET_DMA_TAG(dev) NULL /* XXX */
#endif
/* structure prototypes */
struct usb_xfer_root;
struct usb_dma_parent_tag;
struct usb_dma_tag;
/*
* The following typedef defines the USB DMA load done callback.
*/
typedef void (usb_dma_callback_t)(struct usb_dma_parent_tag *udpt);
/*
* The following structure defines physical and non kernel virtual
* address of a memory page having size USB_PAGE_SIZE.
*/
struct usb_page {
#if USB_HAVE_BUSDMA
bus_size_t physaddr;
void *buffer; /* non Kernel Virtual Address */
#endif
};
/*
* The following structure is used when needing the kernel virtual
* pointer and the physical address belonging to an offset in an USB
* page cache.
*/
struct usb_page_search {
void *buffer;
#if USB_HAVE_BUSDMA
bus_size_t physaddr;
#endif
usb_size_t length;
};
/*
* The following structure is used to keep information about a DMA
* memory allocation.
*/
struct usb_page_cache {
#if USB_HAVE_BUSDMA
bus_dma_tag_t tag;
bus_dmamap_t map;
struct usb_page *page_start;
#endif
struct usb_dma_parent_tag *tag_parent; /* always set */
void *buffer; /* virtual buffer pointer */
#if USB_HAVE_BUSDMA
usb_size_t page_offset_buf;
usb_size_t page_offset_end;
uint8_t isread:1; /* set if we are currently reading
* from the memory. Else write. */
uint8_t ismultiseg:1; /* set if we can have multiple
* segments */
#endif
};
/*
* The following structure describes the parent USB DMA tag.
*/
#if USB_HAVE_BUSDMA
struct usb_dma_parent_tag {
struct cv cv[1]; /* internal condition variable */
bus_dma_tag_t tag; /* always set */
struct mtx *mtx; /* private mutex, always set */
usb_dma_callback_t *func; /* load complete callback function */
struct usb_dma_tag *utag_first;/* pointer to first USB DMA tag */
uint8_t dma_error; /* set if DMA load operation failed */
uint8_t dma_bits; /* number of DMA address lines */
uint8_t utag_max; /* number of USB DMA tags */
};
#else
struct usb_dma_parent_tag {}; /* empty struct */
#endif
/*
* The following structure describes an USB DMA tag.
*/
#if USB_HAVE_BUSDMA
struct usb_dma_tag {
struct usb_dma_parent_tag *tag_parent;
bus_dma_tag_t tag;
usb_size_t align;
usb_size_t size;
};
#else
struct usb_dma_tag {}; /* empty struct */
#endif
/* function prototypes */
int usb_uiomove(struct usb_page_cache *pc, struct uio *uio,
usb_frlength_t pc_offset, usb_frlength_t len);
struct usb_dma_tag *usb_dma_tag_find(struct usb_dma_parent_tag *udpt,
usb_size_t size, usb_size_t align);
uint8_t usb_pc_alloc_mem(struct usb_page_cache *pc, struct usb_page *pg,
usb_size_t size, usb_size_t align);
uint8_t usb_pc_dmamap_create(struct usb_page_cache *pc, usb_size_t size);
uint8_t usb_pc_load_mem(struct usb_page_cache *pc, usb_size_t size,
uint8_t sync);
void usb_bdma_done_event(struct usb_dma_parent_tag *udpt);
void usb_bdma_post_sync(struct usb_xfer *xfer);
void usb_bdma_pre_sync(struct usb_xfer *xfer);
void usb_bdma_work_loop(struct usb_xfer_queue *pq);
void usb_dma_tag_setup(struct usb_dma_parent_tag *udpt,
struct usb_dma_tag *udt, bus_dma_tag_t dmat, struct mtx *mtx,
usb_dma_callback_t *func, uint8_t ndmabits, uint8_t nudt);
void usb_dma_tag_unsetup(struct usb_dma_parent_tag *udpt);
void usb_pc_cpu_flush(struct usb_page_cache *pc);
void usb_pc_cpu_invalidate(struct usb_page_cache *pc);
void usb_pc_dmamap_destroy(struct usb_page_cache *pc);
void usb_pc_free_mem(struct usb_page_cache *pc);
#endif /* _USB_BUSDMA_H_ */
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