| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* |
| 3 | * Driver for the High Speed UART DMA |
| 4 | * |
| 5 | * Copyright (C) 2015 Intel Corporation |
| 6 | */ |
| 7 | |
| 8 | #ifndef _DMA_HSU_H |
| 9 | #define _DMA_HSU_H |
| 10 | |
| 11 | #include <linux/device.h> |
| 12 | #include <linux/interrupt.h> |
| 13 | |
| 14 | #include <linux/platform_data/dma-hsu.h> |
| 15 | |
| 16 | struct hsu_dma; |
| 17 | |
| 18 | /** |
| 19 | * struct hsu_dma_chip - representation of HSU DMA hardware |
| 20 | * @dev: struct device of the DMA controller |
| 21 | * @irq: irq line |
| 22 | * @regs: memory mapped I/O space |
| 23 | * @length: I/O space length |
| 24 | * @offset: offset of the I/O space where registers are located |
| 25 | * @hsu: struct hsu_dma that is filed by ->probe() |
| 26 | * @pdata: platform data for the DMA controller if provided |
| 27 | */ |
| 28 | struct hsu_dma_chip { |
| 29 | struct device *dev; |
| 30 | int irq; |
| 31 | void __iomem *regs; |
| 32 | unsigned int length; |
| 33 | unsigned int offset; |
| 34 | struct hsu_dma *hsu; |
| 35 | }; |
| 36 | |
| 37 | #if IS_ENABLED(CONFIG_HSU_DMA) |
| 38 | /* Export to the internal users */ |
| 39 | int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, |
| 40 | u32 *status); |
| 41 | int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status); |
| 42 | |
| 43 | /* Export to the platform drivers */ |
| 44 | int hsu_dma_probe(struct hsu_dma_chip *chip); |
| 45 | int hsu_dma_remove(struct hsu_dma_chip *chip); |
| 46 | #else |
| 47 | static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, |
| 48 | unsigned short nr, u32 *status) |
| 49 | { |
| 50 | return 0; |
| 51 | } |
| 52 | static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, |
| 53 | u32 status) |
| 54 | { |
| 55 | return 0; |
| 56 | } |
| 57 | static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } |
| 58 | static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } |
| 59 | #endif /* CONFIG_HSU_DMA */ |
| 60 | |
| 61 | #endif /* _DMA_HSU_H */ |