drivers/dma/fsl-edma-main.c

File Facts

System

Linux kernel

Corpus path

drivers/dma/fsl-edma-main.c

Extension

.c

Size

27427 bytes

Lines

988

Domain

Driver Families

Bucket

drivers/dma

Inferred role

Driver Families: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Touches IRQ or DMA behavior; this matters for the representative real-device path.
• 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

• dt-bindings/dma/fsl-edma.h
• linux/bitfield.h
• linux/module.h
• linux/interrupt.h
• linux/clk.h
• linux/of.h
• linux/of_dma.h
• linux/dma-mapping.h
• linux/pm_runtime.h
• linux/pm_domain.h
• linux/property.h
• fsl-edma-common.h

Detected Declarations

• function fsl_edma_synchronize
• function fsl_edma_tx_handler
• function fsl_edma3_err_check
• function scoped_guard
• function fsl_edma3_err_handler_per_chan
• function fsl_edma3_err_handler_shared
• function fsl_edma3_tx_handler
• function fsl_edma2_tx_handler
• function fsl_edma3_or_tx_handler
• function fsl_edma3_tx_0_15_handler
• function fsl_edma3_tx_16_31_handler
• function fsl_edma3_or_err_handler
• function fsl_edma_err_handler
• function fsl_edma_irq_handler
• function fsl_edma_srcid_in_use
• function list_for_each_entry_safe
• function fsl_edma_irq_init
• function fsl_edma3_irq_init
• function fsl_edma3_or_irq_init
• function fsl_edma2_irq_init
• function fsl_edma_irq_exit
• function fsl_disable_clocks
• function fsl_edma3_detach_pd
• function devm_fsl_edma3_detach_pd
• function fsl_edma3_attach_pd
• function fsl_edma_probe
• function fsl_edma_remove
• function fsl_edma_suspend_late
• function fsl_edma_resume_early
• function fsl_edma_init
• function fsl_edma_exit
• module init fsl_edma_init

Annotated Snippet

subsys_initcall(fsl_edma_init);

static void __exit fsl_edma_exit(void)
{
	platform_driver_unregister(&fsl_edma_driver);
}
module_exit(fsl_edma_exit);

MODULE_DESCRIPTION("Freescale eDMA engine driver");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `dt-bindings/dma/fsl-edma.h`, `linux/bitfield.h`, `linux/module.h`, `linux/interrupt.h`, `linux/clk.h`, `linux/of.h`, `linux/of_dma.h`, `linux/dma-mapping.h`.
• Detected declarations: `function fsl_edma_synchronize`, `function fsl_edma_tx_handler`, `function fsl_edma3_err_check`, `function scoped_guard`, `function fsl_edma3_err_handler_per_chan`, `function fsl_edma3_err_handler_shared`, `function fsl_edma3_tx_handler`, `function fsl_edma2_tx_handler`, `function fsl_edma3_or_tx_handler`, `function fsl_edma3_tx_0_15_handler`.
• Atlas domain: Driver Families / drivers/dma.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• 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.