62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Header file for the Atmel AHB DMA Controller driver
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*
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* Copyright (C) 2008 Atmel Corporation
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*/
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#ifndef AT_HDMAC_H
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#define AT_HDMAC_H
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#include <linux/dmaengine.h>
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/**
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* struct at_dma_platform_data - Controller configuration parameters
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* @nr_channels: Number of channels supported by hardware (max 8)
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* @cap_mask: dma_capability flags supported by the platform
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*/
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struct at_dma_platform_data {
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unsigned int nr_channels;
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dma_cap_mask_t cap_mask;
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};
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/**
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* struct at_dma_slave - Controller-specific information about a slave
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* @dma_dev: required DMA master device
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* @cfg: Platform-specific initializer for the CFG register
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*/
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struct at_dma_slave {
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struct device *dma_dev;
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u32 cfg;
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};
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/* Platform-configurable bits in CFG */
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#define ATC_PER_MSB(h) ((0x30U & (h)) >> 4) /* Extract most significant bits of a handshaking identifier */
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#define ATC_SRC_PER(h) (0xFU & (h)) /* Channel src rq associated with periph handshaking ifc h */
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#define ATC_DST_PER(h) ((0xFU & (h)) << 4) /* Channel dst rq associated with periph handshaking ifc h */
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#define ATC_SRC_REP (0x1 << 8) /* Source Replay Mod */
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#define ATC_SRC_H2SEL (0x1 << 9) /* Source Handshaking Mod */
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#define ATC_SRC_H2SEL_SW (0x0 << 9)
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#define ATC_SRC_H2SEL_HW (0x1 << 9)
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#define ATC_SRC_PER_MSB(h) (ATC_PER_MSB(h) << 10) /* Channel src rq (most significant bits) */
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#define ATC_DST_REP (0x1 << 12) /* Destination Replay Mod */
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#define ATC_DST_H2SEL (0x1 << 13) /* Destination Handshaking Mod */
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#define ATC_DST_H2SEL_SW (0x0 << 13)
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#define ATC_DST_H2SEL_HW (0x1 << 13)
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#define ATC_DST_PER_MSB(h) (ATC_PER_MSB(h) << 14) /* Channel dst rq (most significant bits) */
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#define ATC_SOD (0x1 << 16) /* Stop On Done */
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#define ATC_LOCK_IF (0x1 << 20) /* Interface Lock */
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#define ATC_LOCK_B (0x1 << 21) /* AHB Bus Lock */
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#define ATC_LOCK_IF_L (0x1 << 22) /* Master Interface Arbiter Lock */
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#define ATC_LOCK_IF_L_CHUNK (0x0 << 22)
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#define ATC_LOCK_IF_L_BUFFER (0x1 << 22)
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#define ATC_AHB_PROT_MASK (0x7 << 24) /* AHB Protection */
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#define ATC_FIFOCFG_MASK (0x3 << 28) /* FIFO Request Configuration */
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#define ATC_FIFOCFG_LARGESTBURST (0x0 << 28)
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#define ATC_FIFOCFG_HALFFIFO (0x1 << 28)
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#define ATC_FIFOCFG_ENOUGHSPACE (0x2 << 28)
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#endif /* AT_HDMAC_H */
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