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61 lines
1.6 KiB
61 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Driver for the High Speed UART DMA |
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* |
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* Copyright (C) 2015 Intel Corporation |
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*/ |
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#ifndef _DMA_HSU_H |
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#define _DMA_HSU_H |
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#include <linux/device.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_data/dma-hsu.h> |
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struct hsu_dma; |
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/** |
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* struct hsu_dma_chip - representation of HSU DMA hardware |
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* @dev: struct device of the DMA controller |
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* @irq: irq line |
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* @regs: memory mapped I/O space |
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* @length: I/O space length |
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* @offset: offset of the I/O space where registers are located |
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* @hsu: struct hsu_dma that is filed by ->probe() |
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* @pdata: platform data for the DMA controller if provided |
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*/ |
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struct hsu_dma_chip { |
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struct device *dev; |
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int irq; |
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void __iomem *regs; |
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unsigned int length; |
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unsigned int offset; |
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struct hsu_dma *hsu; |
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}; |
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#if IS_ENABLED(CONFIG_HSU_DMA) |
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/* Export to the internal users */ |
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int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, |
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u32 *status); |
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int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status); |
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/* Export to the platform drivers */ |
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int hsu_dma_probe(struct hsu_dma_chip *chip); |
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int hsu_dma_remove(struct hsu_dma_chip *chip); |
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#else |
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static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, |
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unsigned short nr, u32 *status) |
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{ |
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return 0; |
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} |
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static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, |
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u32 status) |
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{ |
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return 0; |
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} |
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static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } |
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static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } |
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#endif /* CONFIG_HSU_DMA */ |
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#endif /* _DMA_HSU_H */
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