49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* S3C24XX DMA handling
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*
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* Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de>
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*/
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/* Helper to encode the source selection constraints for early s3c socs. */
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#define S3C24XX_DMA_CHANREQ(src, chan) ((BIT(3) | src) << chan * 4)
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enum s3c24xx_dma_bus {
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S3C24XX_DMA_APB,
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S3C24XX_DMA_AHB,
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};
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/**
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* @bus: on which bus does the peripheral reside - AHB or APB.
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* @handshake: is a handshake with the peripheral necessary
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* @chansel: channel selection information, depending on variant; reqsel for
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* s3c2443 and later and channel-selection map for earlier SoCs
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* see CHANSEL doc in s3c2443-dma.c
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*/
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struct s3c24xx_dma_channel {
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enum s3c24xx_dma_bus bus;
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bool handshake;
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u16 chansel;
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};
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struct dma_slave_map;
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/**
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* struct s3c24xx_dma_platdata - platform specific settings
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* @num_phy_channels: number of physical channels
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* @channels: array of virtual channel descriptions
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* @num_channels: number of virtual channels
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* @slave_map: dma slave map matching table
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* @slavecnt: number of elements in slave_map
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*/
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struct s3c24xx_dma_platdata {
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int num_phy_channels;
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struct s3c24xx_dma_channel *channels;
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int num_channels;
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const struct dma_slave_map *slave_map;
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int slavecnt;
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};
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struct dma_chan;
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bool s3c24xx_dma_filter(struct dma_chan *chan, void *param);
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