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