usb_busdma.h

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/* $FreeBSD$ */
/*-
 * SPDX-License-Identifier: BSD-2-Clause-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_
 
#ifndef USB_GLOBAL_INCLUDE_FILE
#include <sys/uio.h>
#include <sys/mbuf.h>
 
#include <machine/bus.h>
#endif
 
/* 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_addr_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_addr_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 */
        uint8_t isloaded:1;             /* Set if map is currently loaded. */
#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);
uint8_t usb_pc_buffer_is_aligned(struct usb_page_cache *pc,
            usb_frlength_t offset, usb_frlength_t len,
            usb_frlength_t mask);
 
#endif                                  /* _USB_BUSDMA_H_ */