drivers/media/pci/ddbridge/ddbridge-io.h

File Facts

System

Linux kernel

Corpus path

drivers/media/pci/ddbridge/ddbridge-io.h

Extension

.h

Size

1439 bytes

Lines

63

Domain

Driver Families

Bucket

drivers/media

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.

• 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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/io.h
• ddbridge.h

Detected Declarations

• function Copyright
• function ddblwritel
• function ddbreadl
• function ddbwritel
• function ddbcpyto
• function ddbcpyfrom
• function safe_ddbreadl

Annotated Snippet

#ifndef __DDBRIDGE_IO_H__
#define __DDBRIDGE_IO_H__

#include <linux/io.h>

#include "ddbridge.h"

/******************************************************************************/

static inline u32 ddblreadl(struct ddb_link *link, u32 adr)
{
	return readl(link->dev->regs + adr);
}

static inline void ddblwritel(struct ddb_link *link, u32 val, u32 adr)
{
	writel(val, link->dev->regs + adr);
}

static inline u32 ddbreadl(struct ddb *dev, u32 adr)
{
	return readl(dev->regs + adr);
}

static inline void ddbwritel(struct ddb *dev, u32 val, u32 adr)
{
	writel(val, dev->regs + adr);
}

static inline void ddbcpyto(struct ddb *dev, u32 adr, void *src, long count)
{
	memcpy_toio(dev->regs + adr, src, count);
}

static inline void ddbcpyfrom(struct ddb *dev, void *dst, u32 adr, long count)
{
	memcpy_fromio(dst, dev->regs + adr, count);
}

static inline u32 safe_ddbreadl(struct ddb *dev, u32 adr)
{
	u32 val = ddbreadl(dev, adr);

	/* (ddb)readl returns (uint)-1 (all bits set) on failure, catch that */
	if (val == ~0) {
		dev_err(&dev->pdev->dev, "ddbreadl failure, adr=%08x\n", adr);
		return 0;
	}

	return val;
}

#endif /* __DDBRIDGE_IO_H__ */

Annotation

• Immediate include surface: `linux/io.h`, `ddbridge.h`.
• Detected declarations: `function Copyright`, `function ddblwritel`, `function ddbreadl`, `function ddbwritel`, `function ddbcpyto`, `function ddbcpyfrom`, `function safe_ddbreadl`.
• Atlas domain: Driver Families / drivers/media.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.