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 17 struct device; 18 struct 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 */ 30 struct 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 */ 41 int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, 42 u32 *status); 43 int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status); 44 45 /* Export to the platform drivers */ 46 int hsu_dma_probe(struct hsu_dma_chip *chip); 47 int hsu_dma_remove(struct hsu_dma_chip *chip); 48 #else 49 static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, 50 unsigned short nr, u32 *status) 51 { 52 return 0; 53 } 54 static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, 55 u32 status) 56 { 57 return 0; 58 } 59 static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } 60 static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } 61 #endif /* CONFIG_HSU_DMA */ 62 63 #endif /* _DMA_HSU_H */ 64