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dfebb055 AS |
1 | /* |
2 | * Copyright (c) 2016-2017, The Linux Foundation. All rights reserved. | |
3 | * | |
4 | * This software is licensed under the terms of the GNU General Public | |
5 | * License version 2, as published by the Free Software Foundation, and | |
6 | * may be copied, distributed, and modified under those terms. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #ifndef _QCOM_BAM_DMA_H | |
15 | #define _QCOM_BAM_DMA_H | |
16 | ||
17 | #include <asm/byteorder.h> | |
18 | ||
19 | /* | |
20 | * This data type corresponds to the native Command Element | |
21 | * supported by BAM DMA Engine. | |
22 | * | |
23 | * @cmd_and_addr - upper 8 bits command and lower 24 bits register address. | |
24 | * @data - for write command: content to be written into peripheral register. | |
25 | * for read command: dest addr to write peripheral register value. | |
26 | * @mask - register mask. | |
27 | * @reserved - for future usage. | |
28 | * | |
29 | */ | |
30 | struct bam_cmd_element { | |
31 | __le32 cmd_and_addr; | |
32 | __le32 data; | |
33 | __le32 mask; | |
34 | __le32 reserved; | |
35 | }; | |
36 | ||
37 | /* | |
38 | * This enum indicates the command type in a command element | |
39 | */ | |
40 | enum bam_command_type { | |
41 | BAM_WRITE_COMMAND = 0, | |
42 | BAM_READ_COMMAND, | |
43 | }; | |
44 | ||
45 | /* | |
46 | * prep_bam_ce_le32 - Wrapper function to prepare a single BAM command | |
47 | * element with the data already in le32 format. | |
48 | * | |
49 | * @bam_ce: bam command element | |
50 | * @addr: target address | |
51 | * @cmd: BAM command | |
52 | * @data: actual data for write and dest addr for read in le32 | |
53 | */ | |
54 | static inline void | |
55 | bam_prep_ce_le32(struct bam_cmd_element *bam_ce, u32 addr, | |
56 | enum bam_command_type cmd, __le32 data) | |
57 | { | |
58 | bam_ce->cmd_and_addr = | |
59 | cpu_to_le32((addr & 0xffffff) | ((cmd & 0xff) << 24)); | |
60 | bam_ce->data = data; | |
61 | bam_ce->mask = cpu_to_le32(0xffffffff); | |
62 | } | |
63 | ||
64 | /* | |
65 | * bam_prep_ce - Wrapper function to prepare a single BAM command element | |
66 | * with the data. | |
67 | * | |
68 | * @bam_ce: BAM command element | |
69 | * @addr: target address | |
70 | * @cmd: BAM command | |
71 | * @data: actual data for write and dest addr for read | |
72 | */ | |
73 | static inline void | |
74 | bam_prep_ce(struct bam_cmd_element *bam_ce, u32 addr, | |
75 | enum bam_command_type cmd, u32 data) | |
76 | { | |
77 | bam_prep_ce_le32(bam_ce, addr, cmd, cpu_to_le32(data)); | |
78 | } | |
79 | #endif |