drivers/tty/serial/stm32-usart.c

File Facts

System

Linux kernel

Corpus path

drivers/tty/serial/stm32-usart.c

Extension

.c

Size

61684 bytes

Lines

2227

Domain

Driver Families

Bucket

drivers/tty

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/bitfield.h
• linux/clk.h
• linux/console.h
• linux/delay.h
• linux/dma-direction.h
• linux/dmaengine.h
• linux/dma-mapping.h
• linux/io.h
• linux/iopoll.h
• linux/irq.h
• linux/module.h
• linux/of.h
• linux/of_platform.h
• linux/pinctrl/consumer.h
• linux/platform_device.h
• linux/pm_runtime.h
• linux/pm_wakeirq.h
• linux/serial_core.h
• linux/serial.h
• linux/spinlock.h
• linux/sysrq.h
• linux/tty_flip.h
• linux/tty.h
• serial_mctrl_gpio.h
• stm32-usart.h

Detected Declarations

• struct stm32_usart_thresh_ratio
• function stm32_usart_set_bits
• function stm32_usart_clr_bits
• function stm32_usart_tx_empty
• function stm32_usart_rs485_rts_enable
• function stm32_usart_rs485_rts_disable
• function stm32_usart_config_reg_rs485
• function stm32_usart_config_rs485
• function stm32_usart_init_rs485
• function stm32_usart_rx_dma_started
• function stm32_usart_rx_dma_terminate
• function stm32_usart_dma_pause_resume
• function stm32_usart_rx_dma_pause
• function stm32_usart_rx_dma_resume
• function stm32_usart_pending_rx_pio
• function stm32_usart_get_char_pio
• function stm32_usart_receive_chars_pio
• function stm32_usart_push_buffer_dma
• function stm32_usart_receive_chars_dma
• function stm32_usart_receive_chars
• function stm32_usart_rx_dma_complete
• function stm32_usart_rx_dma_start_or_resume
• function stm32_usart_tx_dma_terminate
• function stm32_usart_tx_dma_started
• function stm32_usart_tx_dma_pause
• function stm32_usart_tx_dma_resume
• function stm32_usart_tx_dma_complete
• function stm32_usart_tx_interrupt_enable
• function stm32_usart_tc_interrupt_enable
• function stm32_usart_tx_interrupt_disable
• function stm32_usart_tc_interrupt_disable
• function stm32_usart_transmit_chars_pio
• function stm32_usart_transmit_chars_dma
• function stm32_usart_transmit_chars
• function stm32_usart_interrupt
• function stm32_usart_set_mctrl
• function stm32_usart_get_mctrl
• function stm32_usart_enable_ms
• function stm32_usart_disable_ms
• function stm32_usart_stop_tx
• function stm32_usart_start_tx
• function stm32_usart_flush_buffer
• function stm32_usart_throttle
• function stm32_usart_unthrottle
• function stm32_usart_stop_rx
• function stm32_usart_break_ctl
• function stm32_usart_startup
• function stm32_usart_shutdown

Annotated Snippet

module_init(stm32_usart_init);
module_exit(stm32_usart_exit);

MODULE_ALIAS("platform:" DRIVER_NAME);
MODULE_DESCRIPTION("STMicroelectronics STM32 serial port driver");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/bitfield.h`, `linux/clk.h`, `linux/console.h`, `linux/delay.h`, `linux/dma-direction.h`, `linux/dmaengine.h`, `linux/dma-mapping.h`, `linux/io.h`.
• Detected declarations: `struct stm32_usart_thresh_ratio`, `function stm32_usart_set_bits`, `function stm32_usart_clr_bits`, `function stm32_usart_tx_empty`, `function stm32_usart_rs485_rts_enable`, `function stm32_usart_rs485_rts_disable`, `function stm32_usart_config_reg_rs485`, `function stm32_usart_config_rs485`, `function stm32_usart_init_rs485`, `function stm32_usart_rx_dma_started`.
• Atlas domain: Driver Families / drivers/tty.
• 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.