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/bits.h>
12#include <linux/types.h>
13
14#define DW_DMA_MAX_NR_MASTERS 4
15#define DW_DMA_MAX_NR_CHANNELS 8
16#define DW_DMA_MIN_BURST 1
17#define DW_DMA_MAX_BURST 256
18
19struct device;
20
21/**
22 * struct dw_dma_slave - Controller-specific information about a slave
23 *
24 * @dma_dev: required DMA master device
25 * @src_id: src request line
26 * @dst_id: dst request line
27 * @m_master: memory master for transfers on allocated channel
28 * @p_master: peripheral master for transfers on allocated channel
29 * @channels: mask of the channels permitted for allocation (zero value means any)
30 * @hs_polarity:set active low polarity of handshake interface
31 */
32struct dw_dma_slave {
33 struct device *dma_dev;
34 u8 src_id;
35 u8 dst_id;
36 u8 m_master;
37 u8 p_master;
38 u8 channels;
39 bool hs_polarity;
40};
41
42/**
43 * struct dw_dma_platform_data - Controller configuration parameters
44 * @nr_masters: Number of AHB masters supported by the controller
45 * @nr_channels: Number of channels supported by hardware (max 8)
46 * @chan_allocation_order: Allocate channels starting from 0 or 7
47 * @chan_priority: Set channel priority increasing from 0 to 7 or 7 to 0.
48 * @block_size: Maximum block size supported by the controller
49 * @data_width: Maximum data width supported by hardware per AHB master
50 * (in bytes, power of 2)
51 * @multi_block: Multi block transfers supported by hardware per channel.
52 * @max_burst: Maximum value of burst transaction size supported by hardware
53 * per channel (in units of CTL.SRC_TR_WIDTH/CTL.DST_TR_WIDTH).
54 * @protctl: Protection control signals setting per channel.
55 * @quirks: Optional platform quirks.
56 */
57struct dw_dma_platform_data {
58 u32 nr_masters;
59 u32 nr_channels;
60#define CHAN_ALLOCATION_ASCENDING 0 /* zero to seven */
61#define CHAN_ALLOCATION_DESCENDING 1 /* seven to zero */
62 u32 chan_allocation_order;
63#define CHAN_PRIORITY_ASCENDING 0 /* chan0 highest */
64#define CHAN_PRIORITY_DESCENDING 1 /* chan7 highest */
65 u32 chan_priority;
66 u32 block_size;
67 u32 data_width[DW_DMA_MAX_NR_MASTERS];
68 u32 multi_block[DW_DMA_MAX_NR_CHANNELS];
69 u32 max_burst[DW_DMA_MAX_NR_CHANNELS];
70#define CHAN_PROTCTL_PRIVILEGED BIT(0)
71#define CHAN_PROTCTL_BUFFERABLE BIT(1)
72#define CHAN_PROTCTL_CACHEABLE BIT(2)
73#define CHAN_PROTCTL_MASK GENMASK(2, 0)
74 u32 protctl;
75#define DW_DMA_QUIRK_XBAR_PRESENT BIT(0)
76 u32 quirks;
77};
78
79#endif /* _PLATFORM_DATA_DMA_DW_H */
80

source code of linux/include/linux/platform_data/dma-dw.h