1 /* $FreeBSD$ */ 2 /*- 3 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 4 * 5 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef _USB_BUSDMA_H_ 30 #define _USB_BUSDMA_H_ 31 32 #ifndef USB_GLOBAL_INCLUDE_FILE 33 #include <sys/uio.h> 34 #include <sys/mbuf.h> 35 36 #include <machine/bus.h> 37 #endif 38 39 /* defines */ 40 41 #define USB_PAGE_SIZE PAGE_SIZE /* use system PAGE_SIZE */ 42 43 #if (__FreeBSD_version >= 700020) 44 #define USB_GET_DMA_TAG(dev) bus_get_dma_tag(dev) 45 #else 46 #define USB_GET_DMA_TAG(dev) NULL /* XXX */ 47 #endif 48 49 /* structure prototypes */ 50 51 struct usb_xfer_root; 52 struct usb_dma_parent_tag; 53 struct usb_dma_tag; 54 55 /* 56 * The following typedef defines the USB DMA load done callback. 57 */ 58 59 typedef void (usb_dma_callback_t)(struct usb_dma_parent_tag *udpt); 60 61 /* 62 * The following structure defines physical and non kernel virtual 63 * address of a memory page having size USB_PAGE_SIZE. 64 */ 65 struct usb_page { 66 #if USB_HAVE_BUSDMA 67 bus_addr_t physaddr; 68 void *buffer; /* non Kernel Virtual Address */ 69 #endif 70 }; 71 72 /* 73 * The following structure is used when needing the kernel virtual 74 * pointer and the physical address belonging to an offset in an USB 75 * page cache. 76 */ 77 struct usb_page_search { 78 void *buffer; 79 #if USB_HAVE_BUSDMA 80 bus_addr_t physaddr; 81 #endif 82 usb_size_t length; 83 }; 84 85 /* 86 * The following structure is used to keep information about a DMA 87 * memory allocation. 88 */ 89 struct usb_page_cache { 90 #if USB_HAVE_BUSDMA 91 bus_dma_tag_t tag; 92 bus_dmamap_t map; 93 struct usb_page *page_start; 94 #endif 95 struct usb_dma_parent_tag *tag_parent; /* always set */ 96 void *buffer; /* virtual buffer pointer */ 97 #if USB_HAVE_BUSDMA 98 usb_size_t page_offset_buf; 99 usb_size_t page_offset_end; 100 uint8_t isread:1; /* set if we are currently reading 101 * from the memory. Else write. */ 102 uint8_t ismultiseg:1; /* set if we can have multiple 103 * segments */ 104 #endif 105 }; 106 107 /* 108 * The following structure describes the parent USB DMA tag. 109 */ 110 #if USB_HAVE_BUSDMA 111 struct usb_dma_parent_tag { 112 struct cv cv[1]; /* internal condition variable */ 113 bus_dma_tag_t tag; /* always set */ 114 115 struct mtx *mtx; /* private mutex, always set */ 116 usb_dma_callback_t *func; /* load complete callback function */ 117 struct usb_dma_tag *utag_first;/* pointer to first USB DMA tag */ 118 uint8_t dma_error; /* set if DMA load operation failed */ 119 uint8_t dma_bits; /* number of DMA address lines */ 120 uint8_t utag_max; /* number of USB DMA tags */ 121 }; 122 #else 123 struct usb_dma_parent_tag {}; /* empty struct */ 124 #endif 125 126 /* 127 * The following structure describes an USB DMA tag. 128 */ 129 #if USB_HAVE_BUSDMA 130 struct usb_dma_tag { 131 struct usb_dma_parent_tag *tag_parent; 132 bus_dma_tag_t tag; 133 usb_size_t align; 134 usb_size_t size; 135 }; 136 #else 137 struct usb_dma_tag {}; /* empty struct */ 138 #endif 139 140 /* function prototypes */ 141 142 int usb_uiomove(struct usb_page_cache *pc, struct uio *uio, 143 usb_frlength_t pc_offset, usb_frlength_t len); 144 struct usb_dma_tag *usb_dma_tag_find(struct usb_dma_parent_tag *udpt, 145 usb_size_t size, usb_size_t align); 146 uint8_t usb_pc_alloc_mem(struct usb_page_cache *pc, struct usb_page *pg, 147 usb_size_t size, usb_size_t align); 148 uint8_t usb_pc_dmamap_create(struct usb_page_cache *pc, usb_size_t size); 149 uint8_t usb_pc_load_mem(struct usb_page_cache *pc, usb_size_t size, 150 uint8_t sync); 151 void usb_bdma_done_event(struct usb_dma_parent_tag *udpt); 152 void usb_bdma_post_sync(struct usb_xfer *xfer); 153 void usb_bdma_pre_sync(struct usb_xfer *xfer); 154 void usb_bdma_work_loop(struct usb_xfer_queue *pq); 155 void usb_dma_tag_setup(struct usb_dma_parent_tag *udpt, 156 struct usb_dma_tag *udt, bus_dma_tag_t dmat, struct mtx *mtx, 157 usb_dma_callback_t *func, uint8_t ndmabits, uint8_t nudt); 158 void usb_dma_tag_unsetup(struct usb_dma_parent_tag *udpt); 159 void usb_pc_cpu_flush(struct usb_page_cache *pc); 160 void usb_pc_cpu_invalidate(struct usb_page_cache *pc); 161 void usb_pc_dmamap_destroy(struct usb_page_cache *pc); 162 void usb_pc_free_mem(struct usb_page_cache *pc); 163 uint8_t usb_pc_buffer_is_aligned(struct usb_page_cache *pc, 164 usb_frlength_t offset, usb_frlength_t len, 165 usb_frlength_t mask); 166 167 #endif /* _USB_BUSDMA_H_ */ 168