drivers/dma/fsldma.c

File Facts

System

Linux kernel

Corpus path

drivers/dma/fsldma.c

Extension

.c

Size

35808 bytes

Lines

1442

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/init.h
• linux/module.h
• linux/pci.h
• linux/slab.h
• linux/interrupt.h
• linux/dmaengine.h
• linux/delay.h
• linux/dma-mapping.h
• linux/dmapool.h
• linux/of.h
• linux/of_address.h
• linux/of_irq.h
• linux/platform_device.h
• linux/fsldma.h
• dmaengine.h
• fsldma.h

Detected Declarations

• function set_sr
• function get_sr
• function set_mr
• function get_mr
• function set_cdar
• function get_cdar
• function set_bcr
• function get_bcr
• function set_desc_cnt
• function set_desc_src
• function set_desc_dst
• function set_desc_next
• function set_ld_eol
• function dma_init
• function dma_is_idle
• function dma_start
• function dma_halt
• function address
• function address
• function fsl_chan_set_request_count
• function fsl_chan_toggle_ext_pause
• function fsl_chan_toggle_ext_start
• function fsl_dma_external_start
• function append_ld_queue
• function fsl_dma_tx_submit
• function fsl_dma_free_descriptor
• function fsldma_clean_completed_descriptor
• function fsldma_run_tx_complete_actions
• function fsldma_clean_running_descriptor
• function fsl_chan_xfer_ld_queue
• function fsldma_cleanup_descriptors
• function fsl_dma_alloc_chan_resources
• function fsldma_free_desc_list
• function fsldma_free_desc_list_reverse
• function fsl_dma_free_chan_resources
• function fsl_dma_prep_memcpy
• function fsl_dma_device_terminate_all
• function fsl_dma_device_config
• function fsl_dma_memcpy_issue_pending
• function fsl_tx_status
• function fsldma_chan_irq
• function dma_do_tasklet
• function fsldma_ctrl_irq
• function fsldma_free_irqs
• function fsldma_request_irqs
• function fsl_dma_chan_probe
• function fsl_dma_chan_remove
• function fsldma_of_probe

Annotated Snippet

subsys_initcall(fsldma_init);
module_exit(fsldma_exit);

MODULE_DESCRIPTION("Freescale Elo series DMA driver");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/init.h`, `linux/module.h`, `linux/pci.h`, `linux/slab.h`, `linux/interrupt.h`, `linux/dmaengine.h`, `linux/delay.h`, `linux/dma-mapping.h`.
• Detected declarations: `function set_sr`, `function get_sr`, `function set_mr`, `function get_mr`, `function set_cdar`, `function get_cdar`, `function set_bcr`, `function get_bcr`, `function set_desc_cnt`, `function set_desc_src`.
• 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.