drivers/dma/imx-dma.c

File Facts

System

Linux kernel

Corpus path

drivers/dma/imx-dma.c

Extension

.c

Size

34682 bytes

Lines

1250

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/err.h
• linux/init.h
• linux/types.h
• linux/mm.h
• linux/interrupt.h
• linux/spinlock.h
• linux/device.h
• linux/dma-mapping.h
• linux/slab.h
• linux/string_choices.h
• linux/platform_device.h
• linux/clk.h
• linux/dmaengine.h
• linux/module.h
• linux/of.h
• linux/of_dma.h
• asm/irq.h
• linux/dma/imx-dma.h
• dmaengine.h

Detected Declarations

• struct imx_dma_2d_config
• struct imxdma_desc
• struct imxdma_channel
• struct imxdma_engine
• struct imxdma_filter_data
• enum imxdma_prep_type
• enum imx_dma_type
• function is_imx1_dma
• function is_imx27_dma
• function imxdma_chan_is_doing_cyclic
• function imx_dmav1_writel
• function imx_dmav1_readl
• function imxdma_hw_chain
• function imxdma_sg_next
• function imxdma_enable_hw
• function imxdma_disable_hw
• function imxdma_watchdog
• function imxdma_err_handler
• function dma_irq_handle_channel
• function dma_irq_handler
• function imxdma_xfer_desc
• function imxdma_tasklet
• function imxdma_terminate_all
• function imxdma_config_write
• function imxdma_config
• function imxdma_tx_status
• function imxdma_tx_submit
• function imxdma_alloc_chan_resources
• function imxdma_free_chan_resources
• function list_for_each_entry_safe
• function for_each_sg
• function imxdma_issue_pending
• function imxdma_filter_fn
• function imxdma_probe
• function imxdma_free_irq
• function imxdma_remove
• function imxdma_module_init
• module init imxdma_module_init

Annotated Snippet

subsys_initcall(imxdma_module_init);

MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
MODULE_DESCRIPTION("i.MX dma driver");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/err.h`, `linux/init.h`, `linux/types.h`, `linux/mm.h`, `linux/interrupt.h`, `linux/spinlock.h`, `linux/device.h`, `linux/dma-mapping.h`.
• Detected declarations: `struct imx_dma_2d_config`, `struct imxdma_desc`, `struct imxdma_channel`, `struct imxdma_engine`, `struct imxdma_filter_data`, `enum imxdma_prep_type`, `enum imx_dma_type`, `function is_imx1_dma`, `function is_imx27_dma`, `function imxdma_chan_is_doing_cyclic`.
• 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.