1 /* $NetBSD: bcm2835_dmac.h,v 1.4 2015/08/09 13:06:44 mlelstv Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca> 5 * 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 ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * 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 BCM2835_DMAC_H 30 #define BCM2835_DMAC_H 31 32 #define DMAC_CS(n) (0x00 + (0x100 * (n))) 33 #define DMAC_CS_RESET __BIT(31) 34 #define DMAC_CS_ABORT __BIT(30) 35 #define DMAC_CS_DISDEBUG __BIT(29) 36 #define DMAC_CS_WAIT_FOR_OUTSTANDING_WRITES __BIT(28) 37 #define DMAC_CS_PANIC_PRIORITY __BITS(23,20) 38 #define DMAC_CS_PRIORITY __BITS(19,16) 39 #define DMAC_CS_ERROR __BIT(8) 40 #define DMAC_CS_WAITING_FOR_OUTSTANDING_WRITES __BIT(6) 41 #define DMAC_CS_DREQ_STOPS_DMA __BIT(5) 42 #define DMAC_CS_PAUSED __BIT(4) 43 #define DMAC_CS_DREQ __BIT(3) 44 #define DMAC_CS_INT __BIT(2) 45 #define DMAC_CS_END __BIT(1) 46 #define DMAC_CS_ACTIVE __BIT(0) 47 #define DMAC_CS_INTMASK (DMAC_CS_INT|DMAC_CS_END) 48 #define DMAC_CONBLK_AD(n) (0x04 + (0x100 * (n))) 49 #define DMAC_TI(n) (0x08 + (0x100 * (n))) 50 #define DMAC_SOURCE_AD(n) (0x0c + (0x100 * (n))) 51 #define DMAC_DEST_AD(n) (0x10 + (0x100 * (n))) 52 #define DMAC_TXFR_LEN(n) (0x14 + (0x100 * (n))) 53 #define DMAC_STRIDE(n) (0x18 + (0x100 * (n))) 54 #define DMAC_NEXTCONBK(n) (0x1c + (0x100 * (n))) 55 #define DMAC_DEBUG(n) (0x20 + (0x100 * (n))) 56 #define DMAC_DEBUG_LITE __BIT(28) 57 #define DMAC_DEBUG_VERSION __BITS(27,25) 58 #define DMAC_DEBUG_DMA_STATE __BITS(24,16) 59 #define DMAC_DEBUG_DMA_ID __BITS(15,8) 60 #define DMAC_DEBUG_OUTSTANDING_WRITES __BITS(7,4) 61 #define DMAC_DEBUG_READ_ERROR __BIT(2) 62 #define DMAC_DEBUG_FIFO_ERROR __BIT(1) 63 #define DMAC_DEBUG_READ_LAST_NOT_SET_ERROR __BIT(0) 64 65 struct bcm_dmac_conblk { 66 uint32_t cb_ti; 67 #define DMAC_TI_NO_WIDE_BURSTS __BIT(26) 68 #define DMAC_TI_WAITS __BITS(25,21) 69 #define DMAC_TI_PERMAP __BITS(20,16) 70 #define DMAC_TI_BURST_LENGTH __BITS(15,12) 71 #define DMAC_TI_SRC_IGNORE __BIT(11) 72 #define DMAC_TI_SRC_DREQ __BIT(10) 73 #define DMAC_TI_SRC_WIDTH __BIT(9) 74 #define DMAC_TI_SRC_INC __BIT(8) 75 #define DMAC_TI_DEST_IGNORE __BIT(7) 76 #define DMAC_TI_DEST_DREQ __BIT(6) 77 #define DMAC_TI_DEST_WIDTH __BIT(5) 78 #define DMAC_TI_DEST_INC __BIT(4) 79 #define DMAC_TI_WAIT_RESP __BIT(3) 80 #define DMAC_TI_TDMODE __BIT(1) 81 #define DMAC_TI_INTEN __BIT(0) 82 uint32_t cb_source_ad; 83 uint32_t cb_dest_ad; 84 uint32_t cb_txfr_len; 85 #define DMAC_TXFR_LEN_YLENGTH __BITS(29,16) 86 #define DMAC_TXFR_LEN_XLENGTH __BITS(15,0) 87 uint32_t cb_stride; 88 #define DMAC_STRIDE_D_STRIDE __BITS(31,16) 89 #define DMAC_STRIDE_S_STRIDE __BITS(15,0) 90 uint32_t cb_nextconbk; 91 uint32_t cb_padding[2]; 92 } __packed; 93 94 #define DMAC_INT_STATUS 0xfe0 95 #define DMAC_ENABLE 0xff0 96 97 enum bcm_dmac_type { 98 BCM_DMAC_TYPE_NORMAL, 99 BCM_DMAC_TYPE_LITE 100 }; 101 102 struct bcm_dmac_channel; 103 104 struct bcm_dmac_channel *bcm_dmac_alloc(enum bcm_dmac_type, int, 105 void (*)(uint32_t, uint32_t, void *), void *); 106 void bcm_dmac_free(struct bcm_dmac_channel *); 107 void bcm_dmac_set_conblk_addr(struct bcm_dmac_channel *, bus_addr_t); 108 int bcm_dmac_transfer(struct bcm_dmac_channel *); 109 void bcm_dmac_halt(struct bcm_dmac_channel *); 110 111 112 #endif /* !BCM2835_DMAC_H */ 113