1 /* $OpenBSD: bcm2835_dmac.h,v 1.1 2020/04/21 18:56:54 tobhe Exp $ */ 2 3 /* 4 * Copyright (c) 2020 Tobias Heider <tobhe@openbsd.org> 5 * Copyright (c) 2019 Neil Ashford <ashfordneil0@gmail.com> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 /*- 21 * Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca> 22 * All rights reserved. 23 * 24 * Redistribution and use in source and binary forms, with or without 25 * modification, are permitted provided that the following conditions 26 * are met: 27 * 1. Redistributions of source code must retain the above copyright 28 * notice, this list of conditions and the following disclaimer. 29 * 2. Redistributions in binary form must reproduce the above copyright 30 * notice, this list of conditions and the following disclaimer in the 31 * documentation and/or other materials provided with the distribution. 32 * 33 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 34 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 35 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 36 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 37 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 38 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 39 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 40 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 41 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 42 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 43 * SUCH DAMAGE. 44 */ 45 46 #ifndef BCM2835_DMAC_H 47 #define BCM2835_DMAC_H 48 49 #define DMAC_CS(n) (0x00 + (0x100 * (n))) 50 #define DMAC_CS_RESET (1<<31) 51 #define DMAC_CS_ABORT (1<<30) 52 #define DMAC_CS_DISDEBUG (1<<29) 53 #define DMAC_CS_WAIT_FOR_OUTSTANDING_WRITES (1<<28) 54 #define DMAC_CS_PANIC_PRIORITY (((1<<24) - 1) ^ (1<<20)) 55 #define DMAC_CS_PRIORITY (((1<<20) - 1) ^ (1<<16)) 56 #define DMAC_CS_ERROR (1<<8) 57 #define DMAC_CS_WAITING_FOR_OUTSTANDING_WRITES (1<<6) 58 #define DMAC_CS_DREQ_STOPS_DMA (1<<5) 59 #define DMAC_CS_PAUSED (1<<4) 60 #define DMAC_CS_DREQ (1<<3) 61 #define DMAC_CS_INT (1<<2) 62 #define DMAC_CS_END (1<<1) 63 #define DMAC_CS_ACTIVE (1<<0) 64 #define DMAC_CS_INTMASK (DMAC_CS_INT|DMAC_CS_END) 65 #define DMAC_CONBLK_AD(n) (0x04 + (0x100 * (n))) 66 #define DMAC_TI(n) (0x08 + (0x100 * (n))) 67 #define DMAC_SOURCE_AD(n) (0x0c + (0x100 * (n))) 68 #define DMAC_DEST_AD(n) (0x10 + (0x100 * (n))) 69 #define DMAC_TXFR_LEN(n) (0x14 + (0x100 * (n))) 70 #define DMAC_STRIDE(n) (0x18 + (0x100 * (n))) 71 #define DMAC_NEXTCONBK(n) (0x1c + (0x100 * (n))) 72 #define DMAC_DEBUG(n) (0x20 + (0x100 * (n))) 73 #define DMAC_DEBUG_LITE (1<<28) 74 #define DMAC_DEBUG_VERSION (((1<<28) - 1) ^ (1<<25)) 75 #define DMAC_DEBUG_DMA_STATE (((1<<25) - 1) ^ (1<<16)) 76 #define DMAC_DEBUG_DMA_ID (((1<<16) - 1) ^ (1<<8)) 77 #define DMAC_DEBUG_OUTSTANDING_WRITES (((1<<8) - 1) ^ (1<<4)) 78 #define DMAC_DEBUG_READ_ERROR (1<<2) 79 #define DMAC_DEBUG_FIFO_ERROR (1<<1) 80 #define DMAC_DEBUG_READ_LAST_NOT_SET_ERROR (1<<0) 81 82 struct bcmdmac_conblk { 83 uint32_t cb_ti; 84 #define DMAC_TI_NO_WIDE_BURSTS (1 << 26) 85 #define DMAC_TI_WAITS (((1 << 26) - 1) ^ (1 << 21)) 86 #define DMAC_TI_PERMAP (((1 << 21) - 1) ^ (1 << 16)) 87 #define DMAC_TI_PERMAP_BASE (1 << 16) 88 #define DMAC_TI_BURST_LENGTH (((1 << 16) - 1) ^ (1 << 12)) 89 #define DMAC_TI_SRC_IGNORE (1 << 11) 90 #define DMAC_TI_SRC_DREQ (1 << 10) 91 #define DMAC_TI_SRC_WIDTH (1 << 9) 92 #define DMAC_TI_SRC_INC (1 << 8) 93 #define DMAC_TI_DEST_IGNORE (1 << 7) 94 #define DMAC_TI_DEST_DREQ (1 << 6) 95 #define DMAC_TI_DEST_WIDTH (1 << 5) 96 #define DMAC_TI_DEST_INC (1 << 4) 97 #define DMAC_TI_WAIT_RESP (1 << 3) 98 #define DMAC_TI_TDMODE (1 << 1) 99 #define DMAC_TI_INTEN (1 << 0) 100 uint32_t cb_source_ad; 101 uint32_t cb_dest_ad; 102 uint32_t cb_txfr_len; 103 #define DMAC_TXFR_LEN_YLENGTH (((1 << 30) - 1) ^ (1 << 16)) 104 #define DMAC_TXFR_LEN_XLENGTH (((1 << 16) - 1) ^ (1 << 0)) 105 uint32_t cb_stride; 106 #define DMAC_STRIDE_D_STRIDE (((1 << 32) - 1) ^ (1 << 16)) 107 #define DMAC_STRIDE_S_STRIDE (((1 << 16) - 1) ^ (1 << 0)) 108 uint32_t cb_nextconbk; 109 uint32_t cb_padding[2]; 110 } __packed; 111 112 #define DMAC_INT_STATUS 0xfe0 113 #define DMAC_ENABLE 0xff0 114 115 enum bcmdmac_type { BCMDMAC_TYPE_NORMAL, BCMDMAC_TYPE_LITE }; 116 117 struct bcmdmac_channel; 118 119 struct bcmdmac_channel *bcmdmac_alloc(enum bcmdmac_type, int, 120 void (*)(uint32_t, uint32_t, void *), void *); 121 void bcmdmac_free(struct bcmdmac_channel *); 122 void bcmdmac_set_conblk_addr(struct bcmdmac_channel *, bus_addr_t); 123 int bcmdmac_transfer(struct bcmdmac_channel *); 124 void bcmdmac_halt(struct bcmdmac_channel *); 125 126 #endif /* BCM2835_DMAC_H */ 127