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2b49e0c5 AS |
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; | |
2b49e0c5 AS |
38 | }; |
39 | ||
47f82f1a | 40 | #if IS_ENABLED(CONFIG_HSU_DMA) |
2b49e0c5 | 41 | /* Export to the internal users */ |
c6f82787 CKT |
42 | int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, |
43 | u32 *status); | |
d2f5a731 | 44 | int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status); |
2b49e0c5 AS |
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); | |
47f82f1a | 49 | #else |
c6f82787 CKT |
50 | static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, |
51 | unsigned short nr, u32 *status) | |
52 | { | |
53 | return 0; | |
54 | } | |
d2f5a731 AS |
55 | static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, |
56 | u32 status) | |
47f82f1a | 57 | { |
d2f5a731 | 58 | return 0; |
47f82f1a HK |
59 | } |
60 | static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } | |
61 | static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } | |
62 | #endif /* CONFIG_HSU_DMA */ | |
2b49e0c5 AS |
63 | |
64 | #endif /* _DMA_HSU_H */ |