1/* 2 * Driver for the High Speed UART DMA 3 * 4 * Copyright (C) 2015 Intel Corporation 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11#ifndef _DMA_HSU_H 12#define _DMA_HSU_H 13 14#include <linux/device.h> 15#include <linux/interrupt.h> 16 17#include <linux/platform_data/dma-hsu.h> 18 19struct hsu_dma; 20 21/** 22 * struct hsu_dma_chip - representation of HSU DMA hardware 23 * @dev: struct device of the DMA controller 24 * @irq: irq line 25 * @regs: memory mapped I/O space 26 * @length: I/O space length 27 * @offset: offset of the I/O space where registers are located 28 * @hsu: struct hsu_dma that is filed by ->probe() 29 * @pdata: platform data for the DMA controller if provided 30 */ 31struct hsu_dma_chip { 32 struct device *dev; 33 int irq; 34 void __iomem *regs; 35 unsigned int length; 36 unsigned int offset; 37 struct hsu_dma *hsu; 38}; 39 40#if IS_ENABLED(CONFIG_HSU_DMA) 41/* Export to the internal users */ 42int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, 43 u32 *status); 44int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status); 45 46/* Export to the platform drivers */ 47int hsu_dma_probe(struct hsu_dma_chip *chip); 48int hsu_dma_remove(struct hsu_dma_chip *chip); 49#else 50static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, 51 unsigned short nr, u32 *status) 52{ 53 return 0; 54} 55static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, 56 u32 status) 57{ 58 return 0; 59} 60static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } 61static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } 62#endif /* CONFIG_HSU_DMA */ 63 64#endif /* _DMA_HSU_H */ 65