drivers/gpio/gpio-omap.c

Source file repositories/reference/linux-study-clean/drivers/gpio/gpio-omap.c

File Facts

System
Linux kernel
Corpus path
drivers/gpio/gpio-omap.c
Extension
.c
Size
43540 bytes
Lines
1605
Domain
Driver Families
Bucket
drivers/gpio
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.

Dependency Surface

Detected Declarations

Annotated Snippet

struct gpio_regs {
	u32 sysconfig;
	u32 irqenable1;
	u32 irqenable2;
	u32 wake_en;
	u32 ctrl;
	u32 oe;
	u32 leveldetect0;
	u32 leveldetect1;
	u32 risingdetect;
	u32 fallingdetect;
	u32 dataout;
	u32 debounce;
	u32 debounce_en;
};

struct gpio_bank {
	void __iomem *base;
	const struct omap_gpio_reg_offs *regs;
	struct device *dev;

	int irq;
	u32 non_wakeup_gpios;
	u32 enabled_non_wakeup_gpios;
	struct gpio_regs context;
	u32 saved_datain;
	u32 level_mask;
	u32 toggle_mask;
	raw_spinlock_t lock;
	raw_spinlock_t wa_lock;
	struct gpio_chip chip;
	struct clk *dbck;
	struct notifier_block nb;
	unsigned int is_suspended:1;
	unsigned int needs_resume:1;
	u32 mod_usage;
	u32 irq_usage;
	u32 dbck_enable_mask;
	bool dbck_enabled;
	bool is_mpuio;
	bool dbck_flag;
	bool loses_context;
	bool context_valid;
	int stride;
	u32 width;
	int context_loss_count;

	void (*set_dataout)(struct gpio_bank *bank, unsigned gpio, int enable);
	int (*get_context_loss_count)(struct device *dev);
};

#define GPIO_MOD_CTRL_BIT	BIT(0)

#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
#define LINE_USED(line, offset) (line & (BIT(offset)))

static void omap_gpio_unmask_irq(struct irq_data *d);

static inline struct gpio_bank *omap_irq_data_get_bank(struct irq_data *d)
{
	struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
	return gpiochip_get_data(chip);
}

static inline u32 omap_gpio_rmw(void __iomem *reg, u32 mask, bool set)
{
	u32 val = readl_relaxed(reg);

	if (set)
		val |= mask;
	else
		val &= ~mask;

	writel_relaxed(val, reg);

	return val;
}

static void omap_set_gpio_direction(struct gpio_bank *bank, int gpio,
				    int is_input)
{
	bank->context.oe = omap_gpio_rmw(bank->base + bank->regs->direction,
					 BIT(gpio), is_input);
}


/* set data out value using dedicate set/clear register */
static void omap_set_gpio_dataout_reg(struct gpio_bank *bank, unsigned offset,
				      int enable)
{

Annotation

Implementation Notes