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/errno.h> 12#include <linux/kconfig.h> 13#include <linux/types.h> 14 15#include <linux/platform_data/dma-hsu.h> 16 17struct device; 18struct hsu_dma; 19 20/** 21 * struct hsu_dma_chip - representation of HSU DMA hardware 22 * @dev: struct device of the DMA controller 23 * @irq: irq line 24 * @regs: memory mapped I/O space 25 * @length: I/O space length 26 * @offset: offset of the I/O space where registers are located 27 * @hsu: struct hsu_dma that is filed by ->probe() 28 * @pdata: platform data for the DMA controller if provided 29 */ 30struct hsu_dma_chip { 31 struct device *dev; 32 int irq; 33 void __iomem *regs; 34 unsigned int length; 35 unsigned int offset; 36 struct hsu_dma *hsu; 37}; 38 39#if IS_ENABLED(CONFIG_HSU_DMA) 40/* Export to the internal users */ 41int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, 42 u32 *status); 43int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status); 44 45/* Export to the platform drivers */ 46int hsu_dma_probe(struct hsu_dma_chip *chip); 47int hsu_dma_remove(struct hsu_dma_chip *chip); 48#else 49static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, 50 unsigned short nr, u32 *status) 51{ 52 return 0; 53} 54static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, 55 u32 status) 56{ 57 return 0; 58} 59static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } 60static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } 61#endif /* CONFIG_HSU_DMA */ 62 63#endif /* _DMA_HSU_H */ 64