drivers/gpio/gpio-npcm-sgpio.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-npcm-sgpio.c

Extension

.c

Size

14543 bytes

Lines

618

Domain

Driver Families

Bucket

drivers/gpio

Inferred role

Driver Families: implementation source

Status

source 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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• 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/gpio/driver.h
• linux/hashtable.h
• linux/init.h
• linux/io.h
• linux/module.h
• linux/platform_device.h
• linux/spinlock.h
• linux/string.h
• linux/units.h

Detected Declarations

• struct npcm_clk_cfg
• struct npcm_sgpio
• struct npcm_sgpio_bank
• enum npcm_sgpio_reg
• function npcm_sgpio_irqd_to_data
• function npcm_sgpio_init_port
• function npcm_sgpio_dir_in
• function npcm_sgpio_dir_out
• function npcm_sgpio_get_direction
• function npcm_sgpio_set
• function npcm_sgpio_get
• function npcm_sgpio_setup_enable
• function npcm_sgpio_setup_clk
• function npcm_sgpio_irq_init_valid_mask
• function npcm_sgpio_irq_set_mask
• function npcm_sgpio_irq_ack
• function npcm_sgpio_irq_mask
• function npcm_sgpio_irq_unmask
• function npcm_sgpio_set_type
• function npcm_sgpio_irq_handler
• function npcm_sgpio_setup_irqs
• function npcm_sgpio_probe

Annotated Snippet

struct npcm_clk_cfg {
	unsigned int	*sft_clk;
	unsigned int	*clk_sel;
	unsigned int	cfg_opt;
};

struct npcm_sgpio {
	struct gpio_chip chip;
	struct clk *pclk;
	struct irq_chip intc;
	raw_spinlock_t lock;

	void __iomem *base;
	int irq;
	u8 nin_sgpio;
	u8 nout_sgpio;
	u8 in_port;
	u8 out_port;
	u8 int_type[MAX_NR_HW_SGPIO];
};

struct npcm_sgpio_bank {
	u8 rdata_reg;
	u8 wdata_reg;
	u8 event_config;
	u8 event_status;
};

enum npcm_sgpio_reg {
	READ_DATA,
	WRITE_DATA,
	EVENT_CFG,
	EVENT_STS,
};

static const struct npcm_sgpio_bank npcm_sgpio_banks[] = {
	{
		.wdata_reg = 0x00,
		.rdata_reg = 0x08,
		.event_config = 0x10,
		.event_status = 0x20,
	},
	{
		.wdata_reg = 0x01,
		.rdata_reg = 0x09,
		.event_config = 0x12,
		.event_status = 0x21,
	},
	{
		.wdata_reg = 0x02,
		.rdata_reg = 0x0a,
		.event_config = 0x14,
		.event_status = 0x22,
	},
	{
		.wdata_reg = 0x03,
		.rdata_reg = 0x0b,
		.event_config = 0x16,
		.event_status = 0x23,
	},
	{
		.wdata_reg = 0x04,
		.rdata_reg = 0x0c,
		.event_config = 0x18,
		.event_status = 0x24,
	},
	{
		.wdata_reg = 0x05,
		.rdata_reg = 0x0d,
		.event_config = 0x1a,
		.event_status = 0x25,
	},
	{
		.wdata_reg = 0x06,
		.rdata_reg = 0x0e,
		.event_config = 0x1c,
		.event_status = 0x26,
	},
	{
		.wdata_reg = 0x07,
		.rdata_reg = 0x0f,
		.event_config = 0x1e,
		.event_status = 0x27,
	},
};

static void __iomem *bank_reg(struct npcm_sgpio *gpio,
			      const struct npcm_sgpio_bank *bank,
			      const enum npcm_sgpio_reg reg)
{

Annotation

• Immediate include surface: `linux/bitfield.h`, `linux/clk.h`, `linux/gpio/driver.h`, `linux/hashtable.h`, `linux/init.h`, `linux/io.h`, `linux/module.h`, `linux/platform_device.h`.
• Detected declarations: `struct npcm_clk_cfg`, `struct npcm_sgpio`, `struct npcm_sgpio_bank`, `enum npcm_sgpio_reg`, `function npcm_sgpio_irqd_to_data`, `function npcm_sgpio_init_port`, `function npcm_sgpio_dir_in`, `function npcm_sgpio_dir_out`, `function npcm_sgpio_get_direction`, `function npcm_sgpio_set`.
• Atlas domain: Driver Families / drivers/gpio.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.