1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Header file for the Atmel AHB DMA Controller driver
4 *
5 * Copyright (C) 2008 Atmel Corporation
6 */
7 #ifndef AT_HDMAC_H
8 #define AT_HDMAC_H
9
10 #include <linux/dmaengine.h>
11
12 /**
13 * struct at_dma_platform_data - Controller configuration parameters
14 * @nr_channels: Number of channels supported by hardware (max 8)
15 * @cap_mask: dma_capability flags supported by the platform
16 */
17 struct at_dma_platform_data {
18 unsigned int nr_channels;
19 dma_cap_mask_t cap_mask;
20 };
21
22 /**
23 * struct at_dma_slave - Controller-specific information about a slave
24 * @dma_dev: required DMA master device
25 * @cfg: Platform-specific initializer for the CFG register
26 */
27 struct at_dma_slave {
28 struct device *dma_dev;
29 u32 cfg;
30 };
31
32
33 /* Platform-configurable bits in CFG */
34 #define ATC_PER_MSB(h) ((0x30U & (h)) >> 4) /* Extract most significant bits of a handshaking identifier */
35
36 #define ATC_SRC_PER(h) (0xFU & (h)) /* Channel src rq associated with periph handshaking ifc h */
37 #define ATC_DST_PER(h) ((0xFU & (h)) << 4) /* Channel dst rq associated with periph handshaking ifc h */
38 #define ATC_SRC_REP (0x1 << 8) /* Source Replay Mod */
39 #define ATC_SRC_H2SEL (0x1 << 9) /* Source Handshaking Mod */
40 #define ATC_SRC_H2SEL_SW (0x0 << 9)
41 #define ATC_SRC_H2SEL_HW (0x1 << 9)
42 #define ATC_SRC_PER_MSB(h) (ATC_PER_MSB(h) << 10) /* Channel src rq (most significant bits) */
43 #define ATC_DST_REP (0x1 << 12) /* Destination Replay Mod */
44 #define ATC_DST_H2SEL (0x1 << 13) /* Destination Handshaking Mod */
45 #define ATC_DST_H2SEL_SW (0x0 << 13)
46 #define ATC_DST_H2SEL_HW (0x1 << 13)
47 #define ATC_DST_PER_MSB(h) (ATC_PER_MSB(h) << 14) /* Channel dst rq (most significant bits) */
48 #define ATC_SOD (0x1 << 16) /* Stop On Done */
49 #define ATC_LOCK_IF (0x1 << 20) /* Interface Lock */
50 #define ATC_LOCK_B (0x1 << 21) /* AHB Bus Lock */
51 #define ATC_LOCK_IF_L (0x1 << 22) /* Master Interface Arbiter Lock */
52 #define ATC_LOCK_IF_L_CHUNK (0x0 << 22)
53 #define ATC_LOCK_IF_L_BUFFER (0x1 << 22)
54 #define ATC_AHB_PROT_MASK (0x7 << 24) /* AHB Protection */
55 #define ATC_FIFOCFG_MASK (0x3 << 28) /* FIFO Request Configuration */
56 #define ATC_FIFOCFG_LARGESTBURST (0x0 << 28)
57 #define ATC_FIFOCFG_HALFFIFO (0x1 << 28)
58 #define ATC_FIFOCFG_ENOUGHSPACE (0x2 << 28)
59
60
61 #endif /* AT_HDMAC_H */