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