drivers/dma/stm32/stm32-mdma.c

File Facts

System

Linux kernel

Corpus path

drivers/dma/stm32/stm32-mdma.c

Extension

.c

Size

53739 bytes

Lines

1830

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/bitfield.h
• linux/clk.h
• linux/delay.h
• linux/dmaengine.h
• linux/dma-mapping.h
• linux/dmapool.h
• linux/err.h
• linux/init.h
• linux/iopoll.h
• linux/jiffies.h
• linux/list.h
• linux/log2.h
• linux/module.h
• linux/of.h
• linux/of_dma.h
• linux/platform_device.h
• linux/pm_runtime.h
• linux/reset.h
• linux/slab.h
• ../virt-dma.h

Detected Declarations

• struct stm32_mdma_chan_config
• struct stm32_mdma_hwdesc
• struct stm32_mdma_desc_node
• struct stm32_mdma_desc
• struct stm32_mdma_dma_config
• struct stm32_mdma_chan
• struct stm32_mdma_device
• enum stm32_mdma_trigger_mode
• enum stm32_mdma_width
• enum stm32_mdma_inc_mode
• function stm32_mdma_read
• function stm32_mdma_write
• function stm32_mdma_set_bits
• function stm32_mdma_clr_bits
• function stm32_mdma_desc_free
• function stm32_mdma_get_width
• function stm32_mdma_get_max_width
• function stm32_mdma_get_best_burst
• function stm32_mdma_disable_chan
• function stm32_mdma_stop
• function stm32_mdma_set_bus
• function stm32_mdma_set_xfer_param
• function stm32_mdma_dump_hwdesc
• function stm32_mdma_setup_hwdesc
• function stm32_mdma_setup_xfer
• function for_each_sg
• function stm32_mdma_prep_slave_sg
• function stm32_mdma_prep_dma_cyclic
• function stm32_mdma_prep_dma_memcpy
• function stm32_mdma_dump_reg
• function stm32_mdma_start_transfer
• function stm32_mdma_issue_pending
• function stm32_mdma_pause
• function stm32_mdma_resume
• function stm32_mdma_terminate_all
• function stm32_mdma_synchronize
• function stm32_mdma_slave_config
• function stm32_mdma_desc_residue
• function stm32_mdma_tx_status
• function stm32_mdma_xfer_end
• function stm32_mdma_irq_handler
• function stm32_mdma_alloc_chan_resources
• function stm32_mdma_free_chan_resources
• function stm32_mdma_filter_fn
• function stm32_mdma_probe
• function stm32_mdma_runtime_suspend
• function stm32_mdma_runtime_resume
• function stm32_mdma_pm_suspend

Annotated Snippet

subsys_initcall(stm32_mdma_init);

MODULE_DESCRIPTION("Driver for STM32 MDMA controller");
MODULE_AUTHOR("M'boumba Cedric Madianga <cedric.madianga@gmail.com>");
MODULE_AUTHOR("Pierre-Yves Mordret <pierre-yves.mordret@st.com>");

Annotation

• Immediate include surface: `linux/bitfield.h`, `linux/clk.h`, `linux/delay.h`, `linux/dmaengine.h`, `linux/dma-mapping.h`, `linux/dmapool.h`, `linux/err.h`, `linux/init.h`.
• Detected declarations: `struct stm32_mdma_chan_config`, `struct stm32_mdma_hwdesc`, `struct stm32_mdma_desc_node`, `struct stm32_mdma_desc`, `struct stm32_mdma_dma_config`, `struct stm32_mdma_chan`, `struct stm32_mdma_device`, `enum stm32_mdma_trigger_mode`, `enum stm32_mdma_width`, `enum stm32_mdma_inc_mode`.
• 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.