3 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #ifndef _USB_BUSDMA_H_
28 #define _USB_BUSDMA_H_
33 #include <machine/bus.h>
37 #define USB_PAGE_SIZE PAGE_SIZE /* use system PAGE_SIZE */
39 #if (__FreeBSD_version >= 700020)
40 #define USB_GET_DMA_TAG(dev) bus_get_dma_tag(dev)
42 #define USB_GET_DMA_TAG(dev) NULL /* XXX */
45 /* structure prototypes */
48 struct usb_dma_parent_tag;
52 * The following typedef defines the USB DMA load done callback.
55 typedef void (usb_dma_callback_t)(struct usb_dma_parent_tag *udpt);
58 * The following structure defines physical and non kernel virtual
59 * address of a memory page having size USB_PAGE_SIZE.
64 void *buffer; /* non Kernel Virtual Address */
69 * The following structure is used when needing the kernel virtual
70 * pointer and the physical address belonging to an offset in an USB
73 struct usb_page_search {
82 * The following structure is used to keep information about a DMA
85 struct usb_page_cache {
90 struct usb_page *page_start;
92 struct usb_dma_parent_tag *tag_parent; /* always set */
93 void *buffer; /* virtual buffer pointer */
95 usb_size_t page_offset_buf;
96 usb_size_t page_offset_end;
97 uint8_t isread:1; /* set if we are currently reading
98 * from the memory. Else write. */
99 uint8_t ismultiseg:1; /* set if we can have multiple
105 * The following structure describes the parent USB DMA tag.
108 struct usb_dma_parent_tag {
109 struct cv cv[1]; /* internal condition variable */
110 bus_dma_tag_t tag; /* always set */
112 struct mtx *mtx; /* private mutex, always set */
113 usb_dma_callback_t *func; /* load complete callback function */
114 struct usb_dma_tag *utag_first;/* pointer to first USB DMA tag */
115 uint8_t dma_error; /* set if DMA load operation failed */
116 uint8_t dma_bits; /* number of DMA address lines */
117 uint8_t utag_max; /* number of USB DMA tags */
120 struct usb_dma_parent_tag {}; /* empty struct */
124 * The following structure describes an USB DMA tag.
128 struct usb_dma_parent_tag *tag_parent;
134 struct usb_dma_tag {}; /* empty struct */
137 /* function prototypes */
139 int usb_uiomove(struct usb_page_cache *pc, struct uio *uio,
140 usb_frlength_t pc_offset, usb_frlength_t len);
141 struct usb_dma_tag *usb_dma_tag_find(struct usb_dma_parent_tag *udpt,
142 usb_size_t size, usb_size_t align);
143 uint8_t usb_pc_alloc_mem(struct usb_page_cache *pc, struct usb_page *pg,
144 usb_size_t size, usb_size_t align);
145 uint8_t usb_pc_dmamap_create(struct usb_page_cache *pc, usb_size_t size);
146 uint8_t usb_pc_load_mem(struct usb_page_cache *pc, usb_size_t size,
148 void usb_bdma_done_event(struct usb_dma_parent_tag *udpt);
149 void usb_bdma_post_sync(struct usb_xfer *xfer);
150 void usb_bdma_pre_sync(struct usb_xfer *xfer);
151 void usb_bdma_work_loop(struct usb_xfer_queue *pq);
152 void usb_dma_tag_setup(struct usb_dma_parent_tag *udpt,
153 struct usb_dma_tag *udt, bus_dma_tag_t dmat, struct mtx *mtx,
154 usb_dma_callback_t *func, uint8_t ndmabits, uint8_t nudt);
155 void usb_dma_tag_unsetup(struct usb_dma_parent_tag *udpt);
156 void usb_pc_cpu_flush(struct usb_page_cache *pc);
157 void usb_pc_cpu_invalidate(struct usb_page_cache *pc);
158 void usb_pc_dmamap_destroy(struct usb_page_cache *pc);
159 void usb_pc_free_mem(struct usb_page_cache *pc);
161 #endif /* _USB_BUSDMA_H_ */