drivers/dma/sf-pdma/sf-pdma.c

File Facts

System

Linux kernel

Corpus path

drivers/dma/sf-pdma/sf-pdma.c

Extension

.c

Size

16363 bytes

Lines

660

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

• linux/module.h
• linux/device.h
• linux/kernel.h
• linux/platform_device.h
• linux/mod_devicetable.h
• linux/dma-mapping.h
• linux/of.h
• linux/of_dma.h
• linux/slab.h
• sf-pdma.h

Detected Declarations

• function Copyright
• function writeq
• function sf_pdma_fill_desc
• function sf_pdma_disclaim_chan
• function sf_pdma_prep_dma_memcpy
• function sf_pdma_slave_config
• function sf_pdma_alloc_chan_resources
• function sf_pdma_disable_request
• function sf_pdma_free_chan_resources
• function sf_pdma_desc_residue
• function sf_pdma_tx_status
• function sf_pdma_terminate_all
• function sf_pdma_enable_request
• function sf_pdma_xfer_desc
• function sf_pdma_issue_pending
• function sf_pdma_free_desc
• function sf_pdma_donebh_tasklet
• function sf_pdma_errbh_tasklet
• function sf_pdma_done_isr
• function sf_pdma_err_isr
• function sf_pdma_irq_init
• function sf_pdma_setup_chans
• function sf_pdma_probe
• function sf_pdma_remove
• function sf_pdma_init
• function sf_pdma_exit
• module init sf_pdma_init

Annotated Snippet

subsys_initcall(sf_pdma_init);
module_exit(sf_pdma_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("SiFive Platform DMA driver");
MODULE_AUTHOR("Green Wan <green.wan@sifive.com>");

Annotation

• Immediate include surface: `linux/module.h`, `linux/device.h`, `linux/kernel.h`, `linux/platform_device.h`, `linux/mod_devicetable.h`, `linux/dma-mapping.h`, `linux/of.h`, `linux/of_dma.h`.
• Detected declarations: `function Copyright`, `function writeq`, `function sf_pdma_fill_desc`, `function sf_pdma_disclaim_chan`, `function sf_pdma_prep_dma_memcpy`, `function sf_pdma_slave_config`, `function sf_pdma_alloc_chan_resources`, `function sf_pdma_disable_request`, `function sf_pdma_free_chan_resources`, `function sf_pdma_desc_residue`.
• 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.