drivers/phy/socionext/phy-uniphier-pcie.c

Source file repositories/reference/linux-study-clean/drivers/phy/socionext/phy-uniphier-pcie.c

File Facts

System
Linux kernel
Corpus path
drivers/phy/socionext/phy-uniphier-pcie.c
Extension
.c
Size
9062 bytes
Lines
350
Domain
Driver Families
Bucket
drivers/phy
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 uniphier_pciephy_priv {
	void __iomem *base;
	struct device *dev;
	struct clk *clk, *clk_gio;
	struct reset_control *rst, *rst_gio;
	const struct uniphier_pciephy_soc_data *data;
};

struct uniphier_pciephy_soc_data {
	bool is_legacy;
	bool is_dual_phy;
	void (*set_phymode)(struct regmap *regmap);
};

static void uniphier_pciephy_testio_write(struct uniphier_pciephy_priv *priv,
					  int id, u32 data)
{
	if (id)
		data <<= TESTIO_PHY_SHIFT;

	/* need to read TESTO twice after accessing TESTI */
	writel(data, priv->base + PCL_PHY_TEST_I);
	readl(priv->base + PCL_PHY_TEST_O);
	readl(priv->base + PCL_PHY_TEST_O);
}

static u32 uniphier_pciephy_testio_read(struct uniphier_pciephy_priv *priv, int id)
{
	u32 val = readl(priv->base + PCL_PHY_TEST_O);

	if (id)
		val >>= TESTIO_PHY_SHIFT;

	return val & TESTO_DAT_MASK;
}

static void uniphier_pciephy_set_param(struct uniphier_pciephy_priv *priv,
				       int id, u32 reg, u32 mask, u32 param)
{
	u32 val;

	/* read previous data */
	val  = FIELD_PREP(TESTI_DAT_MASK, 1);
	val |= FIELD_PREP(TESTI_ADR_MASK, reg);
	uniphier_pciephy_testio_write(priv, id, val);
	val = uniphier_pciephy_testio_read(priv, id);

	/* update value */
	val &= ~mask;
	val |= mask & param;
	val = FIELD_PREP(TESTI_DAT_MASK, val);
	val |= FIELD_PREP(TESTI_ADR_MASK, reg);
	uniphier_pciephy_testio_write(priv, id, val);
	uniphier_pciephy_testio_write(priv, id, val | TESTI_WR_EN);
	uniphier_pciephy_testio_write(priv, id, val);

	/* read current data as dummy */
	val  = FIELD_PREP(TESTI_DAT_MASK, 1);
	val |= FIELD_PREP(TESTI_ADR_MASK, reg);
	uniphier_pciephy_testio_write(priv, id, val);
	uniphier_pciephy_testio_read(priv, id);
}

static void uniphier_pciephy_assert(struct uniphier_pciephy_priv *priv)
{
	u32 val;

	val = readl(priv->base + PCL_PHY_RESET);
	val &= ~PCL_PHY_RESET_N;
	val |= PCL_PHY_RESET_N_MNMODE;
	writel(val, priv->base + PCL_PHY_RESET);
}

static void uniphier_pciephy_deassert(struct uniphier_pciephy_priv *priv)
{
	u32 val;

	val = readl(priv->base + PCL_PHY_RESET);
	val |= PCL_PHY_RESET_N_MNMODE | PCL_PHY_RESET_N;
	writel(val, priv->base + PCL_PHY_RESET);
}

static int uniphier_pciephy_init(struct phy *phy)
{
	struct uniphier_pciephy_priv *priv = phy_get_drvdata(phy);
	u32 val;
	int ret, id;

	ret = clk_prepare_enable(priv->clk);
	if (ret)

Annotation

Implementation Notes