drivers/clk/at91/clk-main.c

Source file repositories/reference/linux-study-clean/drivers/clk/at91/clk-main.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/at91/clk-main.c
Extension
.c
Size
13707 bytes
Lines
597
Domain
Driver Families
Bucket
drivers/clk
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 clk_main_osc {
	struct clk_hw hw;
	struct regmap *regmap;
	struct at91_clk_pms pms;
};

#define to_clk_main_osc(hw) container_of(hw, struct clk_main_osc, hw)

struct clk_main_rc_osc {
	struct clk_hw hw;
	struct regmap *regmap;
	unsigned long frequency;
	unsigned long accuracy;
	struct at91_clk_pms pms;
};

#define to_clk_main_rc_osc(hw) container_of(hw, struct clk_main_rc_osc, hw)

struct clk_rm9200_main {
	struct clk_hw hw;
	struct regmap *regmap;
};

#define to_clk_rm9200_main(hw) container_of(hw, struct clk_rm9200_main, hw)

struct clk_sam9x5_main {
	struct clk_hw hw;
	struct regmap *regmap;
	struct at91_clk_pms pms;
	u8 parent;
};

#define to_clk_sam9x5_main(hw) container_of(hw, struct clk_sam9x5_main, hw)

static inline bool clk_main_osc_ready(struct regmap *regmap)
{
	unsigned int status;

	regmap_read(regmap, AT91_PMC_SR, &status);

	return status & AT91_PMC_MOSCS;
}

static int clk_main_osc_prepare(struct clk_hw *hw)
{
	struct clk_main_osc *osc = to_clk_main_osc(hw);
	struct regmap *regmap = osc->regmap;
	u32 tmp;

	regmap_read(regmap, AT91_CKGR_MOR, &tmp);
	tmp &= ~MOR_KEY_MASK;

	if (tmp & AT91_PMC_OSCBYPASS)
		return 0;

	if (!(tmp & AT91_PMC_MOSCEN)) {
		tmp |= AT91_PMC_MOSCEN | AT91_PMC_KEY;
		regmap_write(regmap, AT91_CKGR_MOR, tmp);
	}

	while (!clk_main_osc_ready(regmap))
		cpu_relax();

	return 0;
}

static void clk_main_osc_unprepare(struct clk_hw *hw)
{
	struct clk_main_osc *osc = to_clk_main_osc(hw);
	struct regmap *regmap = osc->regmap;
	u32 tmp;

	regmap_read(regmap, AT91_CKGR_MOR, &tmp);
	if (tmp & AT91_PMC_OSCBYPASS)
		return;

	if (!(tmp & AT91_PMC_MOSCEN))
		return;

	tmp &= ~(AT91_PMC_KEY | AT91_PMC_MOSCEN);
	regmap_write(regmap, AT91_CKGR_MOR, tmp | AT91_PMC_KEY);
}

static int clk_main_osc_is_prepared(struct clk_hw *hw)
{
	struct clk_main_osc *osc = to_clk_main_osc(hw);
	struct regmap *regmap = osc->regmap;
	u32 tmp, status;

	regmap_read(regmap, AT91_CKGR_MOR, &tmp);

Annotation

Implementation Notes