drivers/clk/mediatek/clk-apmixed.c

Source file repositories/reference/linux-study-clean/drivers/clk/mediatek/clk-apmixed.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/mediatek/clk-apmixed.c
Extension
.c
Size
2344 bytes
Lines
113
Domain
Driver Families
Bucket
drivers/clk
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 mtk_ref2usb_tx {
	struct clk_hw	hw;
	void __iomem	*base_addr;
};

static inline struct mtk_ref2usb_tx *to_mtk_ref2usb_tx(struct clk_hw *hw)
{
	return container_of(hw, struct mtk_ref2usb_tx, hw);
}

static int mtk_ref2usb_tx_is_prepared(struct clk_hw *hw)
{
	struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);

	return (readl(tx->base_addr) & REF2USB_EN_MASK) == REF2USB_EN_MASK;
}

static int mtk_ref2usb_tx_prepare(struct clk_hw *hw)
{
	struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
	u32 val;

	val = readl(tx->base_addr);

	val |= REF2USB_TX_EN;
	writel(val, tx->base_addr);
	udelay(100);

	val |= REF2USB_TX_LPF_EN;
	writel(val, tx->base_addr);

	val |= REF2USB_TX_OUT_EN;
	writel(val, tx->base_addr);

	return 0;
}

static void mtk_ref2usb_tx_unprepare(struct clk_hw *hw)
{
	struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);
	u32 val;

	val = readl(tx->base_addr);
	val &= ~REF2USB_EN_MASK;
	writel(val, tx->base_addr);
}

static const struct clk_ops mtk_ref2usb_tx_ops = {
	.is_prepared	= mtk_ref2usb_tx_is_prepared,
	.prepare	= mtk_ref2usb_tx_prepare,
	.unprepare	= mtk_ref2usb_tx_unprepare,
};

struct clk_hw *mtk_clk_register_ref2usb_tx(const char *name,
			const char *parent_name, void __iomem *reg)
{
	struct mtk_ref2usb_tx *tx;
	struct clk_init_data init = {};
	int ret;

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

	tx->base_addr = reg;
	tx->hw.init = &init;

	init.name = name;
	init.ops = &mtk_ref2usb_tx_ops;
	init.parent_names = &parent_name;
	init.num_parents = 1;

	ret = clk_hw_register(NULL, &tx->hw);

	if (ret) {
		kfree(tx);
		return ERR_PTR(ret);
	}

	return &tx->hw;
}
EXPORT_SYMBOL_GPL(mtk_clk_register_ref2usb_tx);

void mtk_clk_unregister_ref2usb_tx(struct clk_hw *hw)
{
	struct mtk_ref2usb_tx *tx = to_mtk_ref2usb_tx(hw);

	clk_hw_unregister(hw);
	kfree(tx);
}

Annotation

Implementation Notes