126 lines
5.1 KiB
C
126 lines
5.1 KiB
C
/* $OpenBSD: bcm2835_dmac.h,v 1.1 2020/04/21 18:56:54 tobhe Exp $ */
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/*
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* Copyright (c) 2020 Tobias Heider <tobhe@openbsd.org>
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* Copyright (c) 2019 Neil Ashford <ashfordneil0@gmail.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*-
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* Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef BCM2835_DMAC_H
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#define BCM2835_DMAC_H
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#define DMAC_CS(n) (0x00 + (0x100 * (n)))
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#define DMAC_CS_RESET (1<<31)
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#define DMAC_CS_ABORT (1<<30)
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#define DMAC_CS_DISDEBUG (1<<29)
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#define DMAC_CS_WAIT_FOR_OUTSTANDING_WRITES (1<<28)
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#define DMAC_CS_PANIC_PRIORITY (((1<<24) - 1) ^ (1<<20))
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#define DMAC_CS_PRIORITY (((1<<20) - 1) ^ (1<<16))
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#define DMAC_CS_ERROR (1<<8)
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#define DMAC_CS_WAITING_FOR_OUTSTANDING_WRITES (1<<6)
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#define DMAC_CS_DREQ_STOPS_DMA (1<<5)
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#define DMAC_CS_PAUSED (1<<4)
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#define DMAC_CS_DREQ (1<<3)
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#define DMAC_CS_INT (1<<2)
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#define DMAC_CS_END (1<<1)
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#define DMAC_CS_ACTIVE (1<<0)
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#define DMAC_CS_INTMASK (DMAC_CS_INT|DMAC_CS_END)
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#define DMAC_CONBLK_AD(n) (0x04 + (0x100 * (n)))
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#define DMAC_TI(n) (0x08 + (0x100 * (n)))
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#define DMAC_SOURCE_AD(n) (0x0c + (0x100 * (n)))
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#define DMAC_DEST_AD(n) (0x10 + (0x100 * (n)))
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#define DMAC_TXFR_LEN(n) (0x14 + (0x100 * (n)))
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#define DMAC_STRIDE(n) (0x18 + (0x100 * (n)))
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#define DMAC_NEXTCONBK(n) (0x1c + (0x100 * (n)))
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#define DMAC_DEBUG(n) (0x20 + (0x100 * (n)))
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#define DMAC_DEBUG_LITE (1<<28)
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#define DMAC_DEBUG_VERSION (((1<<28) - 1) ^ (1<<25))
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#define DMAC_DEBUG_DMA_STATE (((1<<25) - 1) ^ (1<<16))
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#define DMAC_DEBUG_DMA_ID (((1<<16) - 1) ^ (1<<8))
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#define DMAC_DEBUG_OUTSTANDING_WRITES (((1<<8) - 1) ^ (1<<4))
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#define DMAC_DEBUG_READ_ERROR (1<<2)
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#define DMAC_DEBUG_FIFO_ERROR (1<<1)
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#define DMAC_DEBUG_READ_LAST_NOT_SET_ERROR (1<<0)
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struct bcmdmac_conblk {
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uint32_t cb_ti;
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#define DMAC_TI_NO_WIDE_BURSTS (1 << 26)
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#define DMAC_TI_WAITS (((1 << 26) - 1) ^ (1 << 21))
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#define DMAC_TI_PERMAP (((1 << 21) - 1) ^ (1 << 16))
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#define DMAC_TI_PERMAP_BASE (1 << 16)
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#define DMAC_TI_BURST_LENGTH (((1 << 16) - 1) ^ (1 << 12))
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#define DMAC_TI_SRC_IGNORE (1 << 11)
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#define DMAC_TI_SRC_DREQ (1 << 10)
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#define DMAC_TI_SRC_WIDTH (1 << 9)
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#define DMAC_TI_SRC_INC (1 << 8)
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#define DMAC_TI_DEST_IGNORE (1 << 7)
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#define DMAC_TI_DEST_DREQ (1 << 6)
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#define DMAC_TI_DEST_WIDTH (1 << 5)
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#define DMAC_TI_DEST_INC (1 << 4)
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#define DMAC_TI_WAIT_RESP (1 << 3)
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#define DMAC_TI_TDMODE (1 << 1)
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#define DMAC_TI_INTEN (1 << 0)
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uint32_t cb_source_ad;
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uint32_t cb_dest_ad;
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uint32_t cb_txfr_len;
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#define DMAC_TXFR_LEN_YLENGTH (((1 << 30) - 1) ^ (1 << 16))
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#define DMAC_TXFR_LEN_XLENGTH (((1 << 16) - 1) ^ (1 << 0))
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uint32_t cb_stride;
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#define DMAC_STRIDE_D_STRIDE (((1 << 32) - 1) ^ (1 << 16))
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#define DMAC_STRIDE_S_STRIDE (((1 << 16) - 1) ^ (1 << 0))
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uint32_t cb_nextconbk;
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uint32_t cb_padding[2];
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} __packed;
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#define DMAC_INT_STATUS 0xfe0
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#define DMAC_ENABLE 0xff0
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enum bcmdmac_type { BCMDMAC_TYPE_NORMAL, BCMDMAC_TYPE_LITE };
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struct bcmdmac_channel;
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struct bcmdmac_channel *bcmdmac_alloc(enum bcmdmac_type, int,
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void (*)(uint32_t, uint32_t, void *), void *);
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void bcmdmac_free(struct bcmdmac_channel *);
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void bcmdmac_set_conblk_addr(struct bcmdmac_channel *, bus_addr_t);
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int bcmdmac_transfer(struct bcmdmac_channel *);
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void bcmdmac_halt(struct bcmdmac_channel *);
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#endif /* BCM2835_DMAC_H */
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