From 25483dedd2f5d9bc6928cd790ee59772fb880a79 Mon Sep 17 00:00:00 2001 From: Vinod Koul Date: Fri, 2 Dec 2022 17:11:44 +0530 Subject: dmaengine: Revert "dmaengine: remove s3c24xx driver" This reverts cccc46ae3623 ("dmaengine: remove s3c24xx driver") as it causes regression due to missing header Signed-off-by: Vinod Koul --- include/linux/platform_data/dma-s3c24xx.h | 48 +++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 include/linux/platform_data/dma-s3c24xx.h (limited to 'include/linux') diff --git a/include/linux/platform_data/dma-s3c24xx.h b/include/linux/platform_data/dma-s3c24xx.h new file mode 100644 index 000000000000..96d02dbeea67 --- /dev/null +++ b/include/linux/platform_data/dma-s3c24xx.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * S3C24XX DMA handling + * + * Copyright (c) 2013 Heiko Stuebner + */ + +/* Helper to encode the source selection constraints for early s3c socs. */ +#define S3C24XX_DMA_CHANREQ(src, chan) ((BIT(3) | src) << chan * 4) + +enum s3c24xx_dma_bus { + S3C24XX_DMA_APB, + S3C24XX_DMA_AHB, +}; + +/** + * @bus: on which bus does the peripheral reside - AHB or APB. + * @handshake: is a handshake with the peripheral necessary + * @chansel: channel selection information, depending on variant; reqsel for + * s3c2443 and later and channel-selection map for earlier SoCs + * see CHANSEL doc in s3c2443-dma.c + */ +struct s3c24xx_dma_channel { + enum s3c24xx_dma_bus bus; + bool handshake; + u16 chansel; +}; + +struct dma_slave_map; + +/** + * struct s3c24xx_dma_platdata - platform specific settings + * @num_phy_channels: number of physical channels + * @channels: array of virtual channel descriptions + * @num_channels: number of virtual channels + * @slave_map: dma slave map matching table + * @slavecnt: number of elements in slave_map + */ +struct s3c24xx_dma_platdata { + int num_phy_channels; + struct s3c24xx_dma_channel *channels; + int num_channels; + const struct dma_slave_map *slave_map; + int slavecnt; +}; + +struct dma_chan; +bool s3c24xx_dma_filter(struct dma_chan *chan, void *param); -- cgit v1.2.3