| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | /* |
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| 3 | * Driver for the High Speed UART DMA |
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| 4 | * |
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| 5 | * Copyright (C) 2015 Intel Corporation |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef _DMA_HSU_H |
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| 9 | #define _DMA_HSU_H |
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| 10 | |
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| 11 | #include <linux/errno.h> |
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| 12 | #include <linux/kconfig.h> |
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| 13 | #include <linux/types.h> |
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| 14 | |
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| 15 | #include <linux/platform_data/dma-hsu.h> |
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| 16 | |
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| 17 | struct device; |
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| 18 | struct hsu_dma; |
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| 19 | |
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| 20 | /** |
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| 21 | * struct hsu_dma_chip - representation of HSU DMA hardware |
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| 22 | * @dev: struct device of the DMA controller |
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| 23 | * @irq: irq line |
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| 24 | * @regs: memory mapped I/O space |
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| 25 | * @length: I/O space length |
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| 26 | * @offset: offset of the I/O space where registers are located |
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| 27 | * @hsu: struct hsu_dma that is filed by ->probe() |
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| 28 | * @pdata: platform data for the DMA controller if provided |
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| 29 | */ |
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| 30 | struct hsu_dma_chip { |
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| 31 | struct device *dev; |
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| 32 | int irq; |
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| 33 | void __iomem *regs; |
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| 34 | unsigned int length; |
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| 35 | unsigned int offset; |
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| 36 | struct hsu_dma *hsu; |
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| 37 | }; |
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| 38 | |
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| 39 | #if IS_ENABLED(CONFIG_HSU_DMA) |
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| 40 | /* Export to the internal users */ |
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| 41 | int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, |
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| 42 | u32 *status); |
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| 43 | int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status); |
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| 44 | |
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| 45 | /* Export to the platform drivers */ |
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| 46 | int hsu_dma_probe(struct hsu_dma_chip *chip); |
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| 47 | int hsu_dma_remove(struct hsu_dma_chip *chip); |
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| 48 | #else |
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| 49 | static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, |
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| 50 | unsigned short nr, u32 *status) |
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| 51 | { |
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| 52 | return 0; |
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| 53 | } |
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| 54 | static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, |
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| 55 | u32 status) |
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| 56 | { |
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| 57 | return 0; |
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| 58 | } |
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| 59 | static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } |
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| 60 | static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } |
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| 61 | #endif /* CONFIG_HSU_DMA */ |
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| 62 | |
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| 63 | #endif /* _DMA_HSU_H */ |
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| 64 | |
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