drivers/tty/serial/fsl_lpuart.c

File Facts

System

Linux kernel

Corpus path

drivers/tty/serial/fsl_lpuart.c

Extension

.c

Size

86059 bytes

Lines

3287

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.
• 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/bits.h
• linux/circ_buf.h
• linux/clk.h
• linux/console.h
• linux/delay.h
• linux/dma-mapping.h
• linux/dmaengine.h
• linux/dmapool.h
• linux/io.h
• linux/iopoll.h
• linux/irq.h
• linux/module.h
• linux/of.h
• linux/of_dma.h
• linux/pinctrl/consumer.h
• linux/platform_device.h
• linux/pm_runtime.h
• linux/serial_core.h
• linux/slab.h
• linux/tty_flip.h

Detected Declarations

• struct lpuart_port
• struct lpuart_soc_data
• enum lpuart_type
• function is_layerscape_lpuart
• function is_imx7ulp_lpuart
• function is_imx8ulp_lpuart
• function is_imx8qxp_lpuart
• function lpuart32_read
• function lpuart32_write
• function __lpuart_enable_clks
• function lpuart_get_baud_clk_rate
• function lpuart_stop_tx
• function lpuart32_stop_tx
• function lpuart_stop_rx
• function lpuart32_stop_rx
• function lpuart_dma_tx
• function lpuart_stopped_or_empty
• function lpuart_dma_tx_complete
• function lpuart_dma_datareg_addr
• function lpuart_dma_tx_request
• function lpuart_is_32
• function lpuart_flush_buffer
• function lpuart_wait_bit_set
• function lpuart32_wait_bit_set
• function lpuart_poll_init
• function lpuart_poll_put_char
• function lpuart_poll_get_char
• function lpuart32_poll_init
• function lpuart32_poll_put_char
• function lpuart32_poll_get_char
• function lpuart_transmit_buffer
• function lpuart32_transmit_buffer
• function uart_fifo_get
• function lpuart_start_tx
• function lpuart32_start_tx
• function lpuart_uart_pm
• function lpuart_tx_empty
• function lpuart32_tx_empty
• function lpuart_txint
• function lpuart_rxint
• function lpuart32_txint
• function lpuart32_rxint
• function lpuart_int
• function lpuart_handle_sysrq_chars
• function lpuart_handle_sysrq
• function lpuart_tty_insert_flip_string
• function lpuart_copy_rx_to_tty
• function lpuart_dma_rx_complete

Annotated Snippet

module_init(lpuart_serial_init);
module_exit(lpuart_serial_exit);

MODULE_DESCRIPTION("Freescale lpuart serial port driver");
MODULE_LICENSE("GPL v2");

Annotation

• Immediate include surface: `linux/bitfield.h`, `linux/bits.h`, `linux/circ_buf.h`, `linux/clk.h`, `linux/console.h`, `linux/delay.h`, `linux/dma-mapping.h`, `linux/dmaengine.h`.
• Detected declarations: `struct lpuart_port`, `struct lpuart_soc_data`, `enum lpuart_type`, `function is_layerscape_lpuart`, `function is_imx7ulp_lpuart`, `function is_imx8ulp_lpuart`, `function is_imx8qxp_lpuart`, `function lpuart32_read`, `function lpuart32_write`, `function __lpuart_enable_clks`.
• 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.