drivers/clk/ux500/clk-prcc.c

Source file repositories/reference/linux-study-clean/drivers/clk/ux500/clk-prcc.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/ux500/clk-prcc.c
Extension
.c
Size
3552 bytes
Lines
160
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_prcc {
	struct clk_hw hw;
	void __iomem *base;
	u32 cg_sel;
	int is_enabled;
};

/* PRCC clock operations. */

static int clk_prcc_pclk_enable(struct clk_hw *hw)
{
	struct clk_prcc *clk = to_clk_prcc(hw);

	writel(clk->cg_sel, (clk->base + PRCC_PCKEN));
	while (!(readl(clk->base + PRCC_PCKSR) & clk->cg_sel))
		cpu_relax();

	clk->is_enabled = 1;
	return 0;
}

static void clk_prcc_pclk_disable(struct clk_hw *hw)
{
	struct clk_prcc *clk = to_clk_prcc(hw);

	writel(clk->cg_sel, (clk->base + PRCC_PCKDIS));
	clk->is_enabled = 0;
}

static int clk_prcc_kclk_enable(struct clk_hw *hw)
{
	struct clk_prcc *clk = to_clk_prcc(hw);

	writel(clk->cg_sel, (clk->base + PRCC_KCKEN));
	while (!(readl(clk->base + PRCC_KCKSR) & clk->cg_sel))
		cpu_relax();

	clk->is_enabled = 1;
	return 0;
}

static void clk_prcc_kclk_disable(struct clk_hw *hw)
{
	struct clk_prcc *clk = to_clk_prcc(hw);

	writel(clk->cg_sel, (clk->base + PRCC_KCKDIS));
	clk->is_enabled = 0;
}

static int clk_prcc_is_enabled(struct clk_hw *hw)
{
	struct clk_prcc *clk = to_clk_prcc(hw);
	return clk->is_enabled;
}

static const struct clk_ops clk_prcc_pclk_ops = {
	.enable = clk_prcc_pclk_enable,
	.disable = clk_prcc_pclk_disable,
	.is_enabled = clk_prcc_is_enabled,
};

static const struct clk_ops clk_prcc_kclk_ops = {
	.enable = clk_prcc_kclk_enable,
	.disable = clk_prcc_kclk_disable,
	.is_enabled = clk_prcc_is_enabled,
};

static struct clk *clk_reg_prcc(const char *name,
				const char *parent_name,
				resource_size_t phy_base,
				u32 cg_sel,
				unsigned long flags,
				const struct clk_ops *clk_prcc_ops)
{
	struct clk_prcc *clk;
	struct clk_init_data clk_prcc_init;
	struct clk *clk_reg;

	if (!name) {
		pr_err("clk_prcc: %s invalid arguments passed\n", __func__);
		return ERR_PTR(-EINVAL);
	}

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

	clk->base = ioremap(phy_base, SZ_4K);
	if (!clk->base)
		goto free_clk;

Annotation

Implementation Notes