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 19 struct 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 */ 31 struct 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 */ 42 int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, 43 u32 *status); 44 irqreturn_t hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, 45 u32 status); 46 47 /* Export to the platform drivers */ 48 int hsu_dma_probe(struct hsu_dma_chip *chip); 49 int hsu_dma_remove(struct hsu_dma_chip *chip); 50 #else 51 static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, 52 unsigned short nr, u32 *status) 53 { 54 return 0; 55 } 56 static inline irqreturn_t hsu_dma_do_irq(struct hsu_dma_chip *chip, 57 unsigned short nr, u32 status) 58 { 59 return IRQ_NONE; 60 } 61 static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } 62 static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } 63 #endif /* CONFIG_HSU_DMA */ 64 65 #endif /* _DMA_HSU_H */ 66