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linux-next/include/linux/dma/hsu.h
Andy Shevchenko d2f5a7311b dmaengine: hsu: refactor hsu_dma_do_irq() to return int
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>
2016-09-02 15:05:48 +02:00

65 lines
1.7 KiB
C

/*
* Driver for the High Speed UART DMA
*
* Copyright (C) 2015 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _DMA_HSU_H
#define _DMA_HSU_H
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/platform_data/dma-hsu.h>
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 */