drivers/dma/sh/shdma.h

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

File Facts

System
Linux kernel
Corpus path
drivers/dma/sh/shdma.h
Extension
.h
Size
1645 bytes
Lines
62
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 sh_dmae_chan {
	struct shdma_chan shdma_chan;
	const struct sh_dmae_slave_config *config; /* Slave DMA configuration */
	int xmit_shift;			/* log_2(bytes_per_xfer) */
	void __iomem *base;
	char dev_id[32];		/* unique name per DMAC of channel */
	int pm_error;
	dma_addr_t slave_addr;
};

struct sh_dmae_device {
	struct shdma_dev shdma_dev;
	struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
	const struct sh_dmae_pdata *pdata;
	struct list_head node;
	void __iomem *chan_reg;
	void __iomem *dmars;
	unsigned int chcr_offset;
	u32 chcr_ie_bit;
};

struct sh_dmae_regs {
	u32 sar; /* SAR / source address */
	u32 dar; /* DAR / destination address */
	u32 tcr; /* TCR / transfer count */
};

struct sh_dmae_desc {
	struct sh_dmae_regs hw;
	struct shdma_desc shdma_desc;
};

#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan)
#define to_sh_desc(lh) container_of(lh, struct sh_desc, node)
#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx)
#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
				     struct sh_dmae_device, shdma_dev.dma_dev)

#endif	/* __DMA_SHDMA_H */

Annotation

Implementation Notes