diff options
Diffstat (limited to 'include/linux/dma/hsu.h')
| -rw-r--r-- | include/linux/dma/hsu.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/include/linux/dma/hsu.h b/include/linux/dma/hsu.h new file mode 100644 index 000000000..77ea602c2 --- /dev/null +++ b/include/linux/dma/hsu.h @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Driver for the High Speed UART DMA + * + * Copyright (C) 2015 Intel Corporation + */ + +#ifndef _DMA_HSU_H +#define _DMA_HSU_H + +#include <linux/errno.h> +#include <linux/kconfig.h> +#include <linux/types.h> + +#include <linux/platform_data/dma-hsu.h> + +struct device; +struct hsu_dma; + +/** + * struct hsu_dma_chip - representation of HSU DMA hardware + * @dev: struct device of the DMA controller + * @irq: irq line + * @regs: memory mapped I/O space + * @length: I/O space length + * @offset: offset of the I/O space where registers are located + * @hsu: struct hsu_dma that is filed by ->probe() + * @pdata: platform data for the DMA controller if provided + */ +struct hsu_dma_chip { + struct device *dev; + int irq; + void __iomem *regs; + unsigned int length; + unsigned int offset; + struct hsu_dma *hsu; +}; + +#if IS_ENABLED(CONFIG_HSU_DMA) +/* Export to the internal users */ +int hsu_dma_get_status(struct hsu_dma_chip *chip, unsigned short nr, + u32 *status); +int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, u32 status); + +/* Export to the platform drivers */ +int hsu_dma_probe(struct hsu_dma_chip *chip); +int hsu_dma_remove(struct hsu_dma_chip *chip); +#else +static inline int hsu_dma_get_status(struct hsu_dma_chip *chip, + unsigned short nr, u32 *status) +{ + return 0; +} +static inline int hsu_dma_do_irq(struct hsu_dma_chip *chip, unsigned short nr, + u32 status) +{ + return 0; +} +static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; } +static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; } +#endif /* CONFIG_HSU_DMA */ + +#endif /* _DMA_HSU_H */ |