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