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