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 16 struct 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 */ 28 struct 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 */ 39 int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, 40 u32 *status); 41 int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status); 42 43 /* Export to the platform drivers */ 44 int hsu_dma_probe(struct hsu_dma_chip *chip); 45 int hsu_dma_remove(struct hsu_dma_chip *chip); 46 #else 47 static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, 48 unsigned short nr, u32 *status) 49 { 50 return 0; 51 } 52 static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, 53 u32 status) 54 { 55 return 0; 56 } 57 static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } 58 static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } 59 #endif /* CONFIG_HSU_DMA */ 60 61 #endif /* _DMA_HSU_H */ 62