d2f5a7311b
Since we have nice macro IRQ_RETVAL() we would use it to convert a flag of handled interrupt from int to irqreturn_t. The rationale of doing this is: a) hence we implicitly mark hsu_dma_do_irq() as an auxiliary function that can't be used as interrupt handler directly, and b) to be in align with serial driver which is using serial8250_handle_irq() that returns plain int by design. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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