FreeBSD/Linux Kernel Cross Reference
sys/dev/usb/usb_busdma.h

     /* $FreeBSD: releng/8.3/sys/dev/usb/usb_busdma.h 196220 2009-08-14 20:09:31Z jhb $ */
     /*-
      * 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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