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Diffstat (limited to 'include/linux/platform_data/dma-dw.h')
-rw-r--r-- | include/linux/platform_data/dma-dw.h | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/include/linux/platform_data/dma-dw.h b/include/linux/platform_data/dma-dw.h new file mode 100644 index 000000000..b34a094b2 --- /dev/null +++ b/include/linux/platform_data/dma-dw.h @@ -0,0 +1,76 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Driver for the Synopsys DesignWare DMA Controller + * + * Copyright (C) 2007 Atmel Corporation + * Copyright (C) 2010-2011 ST Microelectronics + */ +#ifndef _PLATFORM_DATA_DMA_DW_H +#define _PLATFORM_DATA_DMA_DW_H + +#include <linux/bits.h> +#include <linux/types.h> + +#define DW_DMA_MAX_NR_MASTERS 4 +#define DW_DMA_MAX_NR_CHANNELS 8 +#define DW_DMA_MIN_BURST 1 +#define DW_DMA_MAX_BURST 256 + +struct device; + +/** + * struct dw_dma_slave - Controller-specific information about a slave + * + * @dma_dev: required DMA master device + * @src_id: src request line + * @dst_id: dst request line + * @m_master: memory master for transfers on allocated channel + * @p_master: peripheral master for transfers on allocated channel + * @channels: mask of the channels permitted for allocation (zero value means any) + * @hs_polarity:set active low polarity of handshake interface + */ +struct dw_dma_slave { + struct device *dma_dev; + u8 src_id; + u8 dst_id; + u8 m_master; + u8 p_master; + u8 channels; + bool hs_polarity; +}; + +/** + * struct dw_dma_platform_data - Controller configuration parameters + * @nr_channels: Number of channels supported by hardware (max 8) + * @chan_allocation_order: Allocate channels starting from 0 or 7 + * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0. + * @block_size: Maximum block size supported by the controller + * @nr_masters: Number of AHB masters supported by the controller + * @data_width: Maximum data width supported by hardware per AHB master + * (in bytes, power of 2) + * @multi_block: Multi block transfers supported by hardware per channel. + * @max_burst: Maximum value of burst transaction size supported by hardware + * per channel (in units of CTL.SRC_TR_WIDTH/CTL.DST_TR_WIDTH). + * @protctl: Protection control signals setting per channel. + */ +struct dw_dma_platform_data { + unsigned int nr_channels; +#define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */ +#define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */ + unsigned char chan_allocation_order; +#define CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */ +#define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */ + unsigned char chan_priority; + unsigned int block_size; + unsigned char nr_masters; + unsigned char data_width[DW_DMA_MAX_NR_MASTERS]; + unsigned char multi_block[DW_DMA_MAX_NR_CHANNELS]; + u32 max_burst[DW_DMA_MAX_NR_CHANNELS]; +#define CHAN_PROTCTL_PRIVILEGED BIT(0) +#define CHAN_PROTCTL_BUFFERABLE BIT(1) +#define CHAN_PROTCTL_CACHEABLE BIT(2) +#define CHAN_PROTCTL_MASK GENMASK(2, 0) + unsigned char protctl; +}; + +#endif /* _PLATFORM_DATA_DMA_DW_H */ |