drivers/clk/imx/clk-busy.c

Source file repositories/reference/linux-study-clean/drivers/clk/imx/clk-busy.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/imx/clk-busy.c
Extension
.c
Size
4410 bytes
Lines
196
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_busy_divider {
	struct clk_divider div;
	const struct clk_ops *div_ops;
	void __iomem *reg;
	u8 shift;
};

static inline struct clk_busy_divider *to_clk_busy_divider(struct clk_hw *hw)
{
	struct clk_divider *div = to_clk_divider(hw);

	return container_of(div, struct clk_busy_divider, div);
}

static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw,
						  unsigned long parent_rate)
{
	struct clk_busy_divider *busy = to_clk_busy_divider(hw);

	return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate);
}

static int clk_busy_divider_determine_rate(struct clk_hw *hw,
					   struct clk_rate_request *req)
{
	struct clk_busy_divider *busy = to_clk_busy_divider(hw);

	return busy->div_ops->determine_rate(&busy->div.hw, req);
}

static int clk_busy_divider_set_rate(struct clk_hw *hw, unsigned long rate,
		unsigned long parent_rate)
{
	struct clk_busy_divider *busy = to_clk_busy_divider(hw);
	int ret;

	ret = busy->div_ops->set_rate(&busy->div.hw, rate, parent_rate);
	if (!ret)
		ret = clk_busy_wait(busy->reg, busy->shift);

	return ret;
}

static const struct clk_ops clk_busy_divider_ops = {
	.recalc_rate = clk_busy_divider_recalc_rate,
	.determine_rate = clk_busy_divider_determine_rate,
	.set_rate = clk_busy_divider_set_rate,
};

struct clk_hw *imx_clk_hw_busy_divider(const char *name, const char *parent_name,
				 void __iomem *reg, u8 shift, u8 width,
				 void __iomem *busy_reg, u8 busy_shift)
{
	struct clk_busy_divider *busy;
	struct clk_hw *hw;
	struct clk_init_data init;
	int ret;

	busy = kzalloc_obj(*busy);
	if (!busy)
		return ERR_PTR(-ENOMEM);

	busy->reg = busy_reg;
	busy->shift = busy_shift;

	busy->div.reg = reg;
	busy->div.shift = shift;
	busy->div.width = width;
	busy->div.lock = &imx_ccm_lock;
	busy->div_ops = &clk_divider_ops;

	init.name = name;
	init.ops = &clk_busy_divider_ops;
	init.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL;
	init.parent_names = &parent_name;
	init.num_parents = 1;

	busy->div.hw.init = &init;

	hw = &busy->div.hw;

	ret = clk_hw_register(NULL, hw);
	if (ret) {
		kfree(busy);
		return ERR_PTR(ret);
	}

	return hw;
}

Annotation

Implementation Notes