drivers/dma/hsu/hsu.h

Source file repositories/reference/linux-study-clean/drivers/dma/hsu/hsu.h

File Facts

System
Linux kernel
Corpus path
drivers/dma/hsu/hsu.h
Extension
.h
Size
3165 bytes
Lines
128
Domain
Driver Families
Bucket
drivers/dma
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct hsu_dma_sg {
	dma_addr_t addr;
	unsigned int len;
};

struct hsu_dma_desc {
	struct virt_dma_desc vdesc;
	enum dma_transfer_direction direction;
	struct hsu_dma_sg *sg;
	unsigned int nents;
	size_t length;
	unsigned int active;
	enum dma_status status;
};

static inline struct hsu_dma_desc *to_hsu_dma_desc(struct virt_dma_desc *vdesc)
{
	return container_of(vdesc, struct hsu_dma_desc, vdesc);
}

struct hsu_dma_chan {
	struct virt_dma_chan vchan;

	void __iomem *reg;

	/* hardware configuration */
	enum dma_transfer_direction direction;
	struct dma_slave_config config;

	struct hsu_dma_desc *desc;
};

static inline struct hsu_dma_chan *to_hsu_dma_chan(struct dma_chan *chan)
{
	return container_of(chan, struct hsu_dma_chan, vchan.chan);
}

static inline u32 hsu_chan_readl(struct hsu_dma_chan *hsuc, int offset)
{
	return readl(hsuc->reg + offset);
}

static inline void hsu_chan_writel(struct hsu_dma_chan *hsuc, int offset,
				   u32 value)
{
	writel(value, hsuc->reg + offset);
}

struct hsu_dma {
	struct dma_device		dma;

	/* channels */
	struct hsu_dma_chan		*chan;
	unsigned short			nr_channels;
};

static inline struct hsu_dma *to_hsu_dma(struct dma_device *ddev)
{
	return container_of(ddev, struct hsu_dma, dma);
}

#endif /* __DMA_HSU_H__ */

Annotation

Implementation Notes