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
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