arch/sh/drivers/dma/dma-sh.c

File Facts

System

Linux kernel

Corpus path

arch/sh/drivers/dma/dma-sh.c

Extension

.c

Size

9253 bytes

Lines

426

Domain

Architecture Layer

Bucket

arch/sh

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.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/init.h
• linux/interrupt.h
• linux/module.h
• linux/io.h
• mach-dreamcast/mach/dma.h
• asm/dma.h
• asm/dma-register.h
• cpu/dma-register.h
• cpu/dma.h

Detected Declarations

• function Copyright
• function dma_base_addr
• function get_dmte_irq
• function get_dmte_irq
• function calc_xmit_shift
• function dma_tei
• function sh_dmac_request_dma
• function sh_dmac_free_dma
• function sh_dmac_configure_channel
• function sh_dmac_enable_dma
• function sh_dmac_disable_dma
• function sh_dmac_xfer_dma
• function sh_dmac_get_dma_residue
• function defined
• function get_dma_error_irq
• function get_dma_error_irq
• function dma_err
• function dmae_irq_init
• function dmae_irq_free
• function dmae_irq_init
• function dmae_irq_free
• function sh_dmac_init
• function sh_dmac_exit
• module init sh_dmac_init

Annotated Snippet

subsys_initcall(sh_dmac_init);
module_exit(sh_dmac_exit);

MODULE_AUTHOR("Takashi YOSHII, Paul Mundt, Andriy Skulysh");
MODULE_DESCRIPTION("SuperH On-Chip DMAC Support");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/init.h`, `linux/interrupt.h`, `linux/module.h`, `linux/io.h`, `mach-dreamcast/mach/dma.h`, `asm/dma.h`, `asm/dma-register.h`, `cpu/dma-register.h`.
• Detected declarations: `function Copyright`, `function dma_base_addr`, `function get_dmte_irq`, `function get_dmte_irq`, `function calc_xmit_shift`, `function dma_tei`, `function sh_dmac_request_dma`, `function sh_dmac_free_dma`, `function sh_dmac_configure_channel`, `function sh_dmac_enable_dma`.
• Atlas domain: Architecture Layer / arch/sh.
• Implementation status: integration implementation candidate.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.