usb_busdma.h (5326B) - Raw
1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #ifndef _USB_BUSDMA_H_ 29 #define _USB_BUSDMA_H_ 30 31 #ifndef USB_GLOBAL_INCLUDE_FILE 32 #include <sys/uio.h> 33 #include <sys/mbuf.h> 34 35 #include <machine/bus.h> 36 #endif 37 38 /* defines */ 39 40 #define USB_PAGE_SIZE PAGE_SIZE /* use system PAGE_SIZE */ 41 42 #define USB_GET_DMA_TAG(dev) bus_get_dma_tag(dev) 43 44 /* structure prototypes */ 45 46 struct usb_xfer_root; 47 struct usb_dma_parent_tag; 48 struct usb_dma_tag; 49 50 /* 51 * The following typedef defines the USB DMA load done callback. 52 */ 53 54 typedef void (usb_dma_callback_t)(struct usb_dma_parent_tag *udpt); 55 56 /* 57 * The following structure defines physical and non kernel virtual 58 * address of a memory page having size USB_PAGE_SIZE. 59 */ 60 struct usb_page { 61 #if USB_HAVE_BUSDMA 62 bus_addr_t physaddr; 63 void *buffer; /* non Kernel Virtual Address */ 64 #endif 65 }; 66 67 /* 68 * The following structure is used when needing the kernel virtual 69 * pointer and the physical address belonging to an offset in an USB 70 * page cache. 71 */ 72 struct usb_page_search { 73 void *buffer; 74 #if USB_HAVE_BUSDMA 75 bus_addr_t physaddr; 76 #endif 77 usb_size_t length; 78 }; 79 80 /* 81 * The following structure is used to keep information about a DMA 82 * memory allocation. 83 */ 84 struct usb_page_cache { 85 #if USB_HAVE_BUSDMA 86 bus_dma_tag_t tag; 87 bus_dmamap_t map; 88 struct usb_page *page_start; 89 #endif 90 struct usb_dma_parent_tag *tag_parent; /* always set */ 91 void *buffer; /* virtual buffer pointer */ 92 #if USB_HAVE_BUSDMA 93 usb_size_t page_offset_buf; 94 usb_size_t page_offset_end; 95 uint8_t isread:1; /* set if we are currently reading 96 * from the memory. Else write. */ 97 uint8_t ismultiseg:1; /* set if we can have multiple 98 * segments */ 99 uint8_t isloaded:1; /* Set if map is currently loaded. */ 100 #endif 101 }; 102 103 /* 104 * The following structure describes the parent USB DMA tag. 105 */ 106 #if USB_HAVE_BUSDMA 107 struct usb_dma_parent_tag { 108 struct cv cv[1]; /* internal condition variable */ 109 bus_dma_tag_t tag; /* always set */ 110 111 struct mtx *mtx; /* private mutex, always set */ 112 usb_dma_callback_t *func; /* load complete callback function */ 113 struct usb_dma_tag *utag_first;/* pointer to first USB DMA tag */ 114 uint8_t dma_error; /* set if DMA load operation failed */ 115 uint8_t dma_bits; /* number of DMA address lines */ 116 uint8_t utag_max; /* number of USB DMA tags */ 117 }; 118 #else 119 struct usb_dma_parent_tag {}; /* empty struct */ 120 #endif 121 122 /* 123 * The following structure describes an USB DMA tag. 124 */ 125 #if USB_HAVE_BUSDMA 126 struct usb_dma_tag { 127 struct usb_dma_parent_tag *tag_parent; 128 bus_dma_tag_t tag; 129 usb_size_t align; 130 usb_size_t size; 131 }; 132 #else 133 struct usb_dma_tag {}; /* empty struct */ 134 #endif 135 136 /* function prototypes */ 137 138 int usb_uiomove(struct usb_page_cache *pc, struct uio *uio, 139 usb_frlength_t pc_offset, usb_frlength_t len); 140 struct usb_dma_tag *usb_dma_tag_find(struct usb_dma_parent_tag *udpt, 141 usb_size_t size, usb_size_t align); 142 uint8_t usb_pc_alloc_mem(struct usb_page_cache *pc, struct usb_page *pg, 143 usb_size_t size, usb_size_t align); 144 uint8_t usb_pc_dmamap_create(struct usb_page_cache *pc, usb_size_t size); 145 uint8_t usb_pc_load_mem(struct usb_page_cache *pc, usb_size_t size, 146 uint8_t sync); 147 void usb_bdma_done_event(struct usb_dma_parent_tag *udpt); 148 void usb_bdma_post_sync(struct usb_xfer *xfer); 149 void usb_bdma_pre_sync(struct usb_xfer *xfer); 150 void usb_bdma_work_loop(struct usb_xfer_queue *pq); 151 void usb_dma_tag_setup(struct usb_dma_parent_tag *udpt, 152 struct usb_dma_tag *udt, bus_dma_tag_t dmat, struct mtx *mtx, 153 usb_dma_callback_t *func, uint8_t ndmabits, uint8_t nudt); 154 void usb_dma_tag_unsetup(struct usb_dma_parent_tag *udpt); 155 void usb_pc_cpu_flush(struct usb_page_cache *pc); 156 void usb_pc_cpu_invalidate(struct usb_page_cache *pc); 157 void usb_pc_dmamap_destroy(struct usb_page_cache *pc); 158 void usb_pc_free_mem(struct usb_page_cache *pc); 159 uint8_t usb_pc_buffer_is_aligned(struct usb_page_cache *pc, 160 usb_frlength_t offset, usb_frlength_t len, 161 usb_frlength_t mask); 162 163 #endif /* _USB_BUSDMA_H_ */