1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Driver for the Synopsys DesignWare DMA Controller 4 * 5 * Copyright (C) 2007 Atmel Corporation 6 * Copyright (C) 2010-2011 ST Microelectronics 7 */ 8 #ifndef _PLATFORM_DATA_DMA_DW_H 9 #define _PLATFORM_DATA_DMA_DW_H 10 11 #include <linux/device.h> 12 13 #define DW_DMA_MAX_NR_MASTERS 4 14 #define DW_DMA_MAX_NR_CHANNELS 8 15 16 /** 17 * struct dw_dma_slave - Controller-specific information about a slave 18 * 19 * @dma_dev: required DMA master device 20 * @src_id: src request line 21 * @dst_id: dst request line 22 * @m_master: memory master for transfers on allocated channel 23 * @p_master: peripheral master for transfers on allocated channel 24 * @hs_polarity:set active low polarity of handshake interface 25 */ 26 struct dw_dma_slave { 27 struct device *dma_dev; 28 u8 src_id; 29 u8 dst_id; 30 u8 m_master; 31 u8 p_master; 32 bool hs_polarity; 33 }; 34 35 /** 36 * struct dw_dma_platform_data - Controller configuration parameters 37 * @nr_channels: Number of channels supported by hardware (max 8) 38 * @chan_allocation_order: Allocate channels starting from 0 or 7 39 * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0. 40 * @block_size: Maximum block size supported by the controller 41 * @nr_masters: Number of AHB masters supported by the controller 42 * @data_width: Maximum data width supported by hardware per AHB master 43 * (in bytes, power of 2) 44 * @multi_block: Multi block transfers supported by hardware per channel. 45 * @protctl: Protection control signals setting per channel. 46 */ 47 struct dw_dma_platform_data { 48 unsigned int nr_channels; 49 #define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */ 50 #define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */ 51 unsigned char chan_allocation_order; 52 #define CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */ 53 #define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */ 54 unsigned char chan_priority; 55 unsigned int block_size; 56 unsigned char nr_masters; 57 unsigned char data_width[DW_DMA_MAX_NR_MASTERS]; 58 unsigned char multi_block[DW_DMA_MAX_NR_CHANNELS]; 59 #define CHAN_PROTCTL_PRIVILEGED BIT(0) 60 #define CHAN_PROTCTL_BUFFERABLE BIT(1) 61 #define CHAN_PROTCTL_CACHEABLE BIT(2) 62 #define CHAN_PROTCTL_MASK GENMASK(2, 0) 63 unsigned char protctl; 64 }; 65 66 #endif /* _PLATFORM_DATA_DMA_DW_H */ 67