arch/powerpc/platforms/pasemi/gpio_mdio.c

File Facts

System

Linux kernel

Corpus path

arch/powerpc/platforms/pasemi/gpio_mdio.c

Extension

.c

Size

6287 bytes

Lines

326

Domain

Architecture Layer

Bucket

arch/powerpc

Inferred role

Architecture Layer: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

• CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/io.h
• linux/module.h
• linux/types.h
• linux/slab.h
• linux/sched.h
• linux/errno.h
• linux/ioport.h
• linux/interrupt.h
• linux/phy.h
• linux/of_address.h
• linux/of_mdio.h
• linux/platform_device.h

Detected Declarations

• struct gpio_priv
• function mdio_lo
• function mdio_hi
• function mdc_lo
• function mdc_hi
• function mdio_active
• function mdio_tristate
• function mdio_read
• function clock_out
• function bitbang_pre
• function gpio_mdio_read
• function gpio_mdio_write
• function gpio_mdio_reset
• function gpio_mdio_probe
• function gpio_mdio_remove
• function gpio_mdio_init
• function gpio_mdio_exit
• module init gpio_mdio_init

Annotated Snippet

module_init(gpio_mdio_init);

static void __exit gpio_mdio_exit(void)
{
	platform_driver_unregister(&gpio_mdio_driver);
	if (gpio_regs)
		iounmap(gpio_regs);
}
module_exit(gpio_mdio_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Olof Johansson <olof@lixom.net>");
MODULE_DESCRIPTION("Driver for MDIO over GPIO on PA Semi PWRficient-based boards");

Annotation

• Immediate include surface: `linux/io.h`, `linux/module.h`, `linux/types.h`, `linux/slab.h`, `linux/sched.h`, `linux/errno.h`, `linux/ioport.h`, `linux/interrupt.h`.
• Detected declarations: `struct gpio_priv`, `function mdio_lo`, `function mdio_hi`, `function mdc_lo`, `function mdc_hi`, `function mdio_active`, `function mdio_tristate`, `function mdio_read`, `function clock_out`, `function bitbang_pre`.
• Atlas domain: Architecture Layer / arch/powerpc.
• Implementation status: integration 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.