Zephyr API Documentation  3.6.99
A Scalable Open Source RTOS
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dma_stm32.h
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1/*
2 * Copyright (c) 2021 Linaro Limited
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7#ifndef ZEPHYR_INCLUDE_DRIVERS_DMA_STM32_H_
8#define ZEPHYR_INCLUDE_DRIVERS_DMA_STM32_H_
9
10/* @brief linked_channel value to inform zephyr dma driver that
11 * DMA channel will be handled by HAL
12 */
13#define STM32_DMA_HAL_OVERRIDE 0x7F
14
15/* @brief gives the first DMA channel : 0 or 1 in the register map
16 * when counting channels from 1 to N or from 0 to N-1
17 */
18#if defined(CONFIG_DMA_STM32U5)
19/* from DTS the dma stream id is in range 0..N-1 */
20#define STM32_DMA_STREAM_OFFSET 0
21#elif !defined(CONFIG_DMA_STM32_V1)
22/* from DTS the dma stream id is in range 1..N */
23/* so decrease to set range from 0 from now on */
24#define STM32_DMA_STREAM_OFFSET 1
25#elif defined(CONFIG_DMA_STM32_V1) && defined(CONFIG_DMAMUX_STM32)
26/* typically on the stm32H7 serie, DMA V1 with mux */
27#define STM32_DMA_STREAM_OFFSET 1
28#else
29/* from DTS the dma stream id is in range 0..N-1 */
30#define STM32_DMA_STREAM_OFFSET 0
31#endif /* ! CONFIG_DMA_STM32_V1 */
32
33/* macro for dma slot (only for dma-v1 or dma-v2 types) */
34#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32_dma_v2bis)
35#define STM32_DMA_SLOT(id, dir, slot) 0
36#define STM32_DMA_SLOT_BY_IDX(id, idx, slot) 0
37#else
38#define STM32_DMA_SLOT(id, dir, slot) DT_INST_DMAS_CELL_BY_NAME(id, dir, slot)
39#define STM32_DMA_SLOT_BY_IDX(id, idx, slot) DT_INST_DMAS_CELL_BY_IDX(id, idx, slot)
40#endif
41
42#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32_dma_v2) || \
43 DT_HAS_COMPAT_STATUS_OKAY(st_stm32_dma_v2bis) || \
44 DT_HAS_COMPAT_STATUS_OKAY(st_stm32_dmamux)
45#define STM32_DMA_FEATURES(id, dir) 0
46#else
47#define STM32_DMA_FEATURES(id, dir) \
48 DT_INST_DMAS_CELL_BY_NAME(id, dir, features)
49#endif
50
51#define STM32_DMA_CTLR(id, dir) \
52 DT_INST_DMAS_CTLR_BY_NAME(id, dir)
53#define STM32_DMA_CHANNEL_CONFIG(id, dir) \
54 DT_INST_DMAS_CELL_BY_NAME(id, dir, channel_config)
55#define STM32_DMA_CHANNEL_CONFIG_BY_IDX(id, idx) \
56 DT_INST_DMAS_CELL_BY_IDX(id, idx, channel_config)
57
58/* macros for channel-config */
59/* direction defined on bits 6-7 */
60/* 0 -> MEM_TO_MEM, 1 -> MEM_TO_PERIPH, 2 -> PERIPH_TO_MEM */
61#define STM32_DMA_CONFIG_DIRECTION(config) ((config >> 6) & 0x3)
62/* periph increment defined on bit 9 as true/false */
63#define STM32_DMA_CONFIG_PERIPHERAL_ADDR_INC(config) ((config >> 9) & 0x1)
64/* mem increment defined on bit 10 as true/false */
65#define STM32_DMA_CONFIG_MEMORY_ADDR_INC(config) ((config >> 10) & 0x1)
66/* periph data size defined on bits 11-12 */
67/* 0 -> 1 byte, 1 -> 2 bytes, 2 -> 4 bytes */
68#define STM32_DMA_CONFIG_PERIPHERAL_DATA_SIZE(config) \
69 (1 << ((config >> 11) & 0x3))
70/* memory data size defined on bits 13, 14 */
71/* 0 -> 1 byte, 1 -> 2 bytes, 2 -> 4 bytes */
72#define STM32_DMA_CONFIG_MEMORY_DATA_SIZE(config) \
73 (1 << ((config >> 13) & 0x3))
74/* priority increment offset defined on bit 15 */
75#define STM32_DMA_CONFIG_PERIPHERAL_INC_FIXED(config) ((config >> 15) & 0x1)
76/* priority defined on bits 16-17 as 0, 1, 2, 3 */
77#define STM32_DMA_CONFIG_PRIORITY(config) ((config >> 16) & 0x3)
78
79/* macro for features (only for dma-v1) */
80#if DT_HAS_COMPAT_STATUS_OKAY(st_stm32_dma_v1)
81#define STM32_DMA_FEATURES_FIFO_THRESHOLD(features) (features & 0x3)
82#else
83#define STM32_DMA_FEATURES_FIFO_THRESHOLD(features) 0
84#endif
85
86#endif /* ZEPHYR_INCLUDE_DRIVERS_DMA_STM32_H_ */