drivers/clocksource/timer-rockchip.c

Source file repositories/reference/linux-study-clean/drivers/clocksource/timer-rockchip.c

File Facts

System
Linux kernel
Corpus path
drivers/clocksource/timer-rockchip.c
Extension
.c
Size
6915 bytes
Lines
305
Domain
Driver Families
Bucket
drivers/clocksource
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.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rk_timer {
	void __iomem *base;
	void __iomem *ctrl;
	struct clk *clk;
	struct clk *pclk;
	u32 freq;
	int irq;
};

struct rk_clkevt {
	struct clock_event_device ce;
	struct rk_timer timer;
};

static struct rk_clkevt *rk_clkevt;
static struct rk_timer *rk_clksrc;

static inline struct rk_timer *rk_timer(struct clock_event_device *ce)
{
	return &container_of(ce, struct rk_clkevt, ce)->timer;
}

static inline void rk_timer_disable(struct rk_timer *timer)
{
	writel_relaxed(TIMER_DISABLE, timer->ctrl);
}

static inline void rk_timer_enable(struct rk_timer *timer, u32 flags)
{
	writel_relaxed(TIMER_ENABLE | flags, timer->ctrl);
}

static void rk_timer_update_counter(unsigned long cycles,
				    struct rk_timer *timer)
{
	writel_relaxed(cycles, timer->base + TIMER_LOAD_COUNT0);
	writel_relaxed(0, timer->base + TIMER_LOAD_COUNT1);
}

static void rk_timer_interrupt_clear(struct rk_timer *timer)
{
	writel_relaxed(1, timer->base + TIMER_INT_STATUS);
}

static inline int rk_timer_set_next_event(unsigned long cycles,
					  struct clock_event_device *ce)
{
	struct rk_timer *timer = rk_timer(ce);

	rk_timer_disable(timer);
	rk_timer_update_counter(cycles, timer);
	rk_timer_enable(timer, TIMER_MODE_USER_DEFINED_COUNT |
			       TIMER_INT_UNMASK);
	return 0;
}

static int rk_timer_shutdown(struct clock_event_device *ce)
{
	struct rk_timer *timer = rk_timer(ce);

	rk_timer_disable(timer);
	return 0;
}

static int rk_timer_set_periodic(struct clock_event_device *ce)
{
	struct rk_timer *timer = rk_timer(ce);

	rk_timer_disable(timer);
	rk_timer_update_counter(timer->freq / HZ - 1, timer);
	rk_timer_enable(timer, TIMER_MODE_FREE_RUNNING | TIMER_INT_UNMASK);
	return 0;
}

static irqreturn_t rk_timer_interrupt(int irq, void *dev_id)
{
	struct clock_event_device *ce = dev_id;
	struct rk_timer *timer = rk_timer(ce);

	rk_timer_interrupt_clear(timer);

	if (clockevent_state_oneshot(ce))
		rk_timer_disable(timer);

	ce->event_handler(ce);

	return IRQ_HANDLED;
}

static u64 notrace rk_timer_sched_read(void)

Annotation

Implementation Notes