drivers/phy/marvell/phy-pxa-usb.c

Source file repositories/reference/linux-study-clean/drivers/phy/marvell/phy-pxa-usb.c

File Facts

System
Linux kernel
Corpus path
drivers/phy/marvell/phy-pxa-usb.c
Extension
.c
Size
9763 bytes
Lines
343
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 pxa_usb_phy {
	struct phy *phy;
	void __iomem *base;
	enum pxa_usb_phy_version version;
};

/*****************************************************************************
 * The registers read/write routines
 *****************************************************************************/

static unsigned int u2o_get(void __iomem *base, unsigned int offset)
{
	return readl_relaxed(base + offset);
}

static void u2o_set(void __iomem *base, unsigned int offset,
		unsigned int value)
{
	u32 reg;

	reg = readl_relaxed(base + offset);
	reg |= value;
	writel_relaxed(reg, base + offset);
	readl_relaxed(base + offset);
}

static void u2o_clear(void __iomem *base, unsigned int offset,
		unsigned int value)
{
	u32 reg;

	reg = readl_relaxed(base + offset);
	reg &= ~value;
	writel_relaxed(reg, base + offset);
	readl_relaxed(base + offset);
}

static void u2o_write(void __iomem *base, unsigned int offset,
		unsigned int value)
{
	writel_relaxed(value, base + offset);
	readl_relaxed(base + offset);
}

static int pxa_usb_phy_init(struct phy *phy)
{
	struct pxa_usb_phy *pxa_usb_phy = phy_get_drvdata(phy);
	void __iomem *base = pxa_usb_phy->base;
	int loops;

	dev_info(&phy->dev, "initializing Marvell PXA USB PHY");

	/* Initialize the USB PHY power */
	if (pxa_usb_phy->version == PXA_USB_PHY_PXA910) {
		u2o_set(base, UTMI_CTRL, (1<<UTMI_CTRL_INPKT_DELAY_SOF_SHIFT)
			| (1<<UTMI_CTRL_PU_REF_SHIFT));
	}

	u2o_set(base, UTMI_CTRL, 1<<UTMI_CTRL_PLL_PWR_UP_SHIFT);
	u2o_set(base, UTMI_CTRL, 1<<UTMI_CTRL_PWR_UP_SHIFT);

	/* UTMI_PLL settings */
	u2o_clear(base, UTMI_PLL, UTMI_PLL_PLLVDD18_MASK
		| UTMI_PLL_PLLVDD12_MASK | UTMI_PLL_PLLCALI12_MASK
		| UTMI_PLL_FBDIV_MASK | UTMI_PLL_REFDIV_MASK
		| UTMI_PLL_ICP_MASK | UTMI_PLL_KVCO_MASK);

	u2o_set(base, UTMI_PLL, 0xee<<UTMI_PLL_FBDIV_SHIFT
		| 0xb<<UTMI_PLL_REFDIV_SHIFT | 3<<UTMI_PLL_PLLVDD18_SHIFT
		| 3<<UTMI_PLL_PLLVDD12_SHIFT | 3<<UTMI_PLL_PLLCALI12_SHIFT
		| 1<<UTMI_PLL_ICP_SHIFT | 3<<UTMI_PLL_KVCO_SHIFT);

	/* UTMI_TX */
	u2o_clear(base, UTMI_TX, UTMI_TX_REG_EXT_FS_RCAL_EN_MASK
		| UTMI_TX_TXVDD12_MASK | UTMI_TX_CK60_PHSEL_MASK
		| UTMI_TX_IMPCAL_VTH_MASK | UTMI_TX_REG_EXT_FS_RCAL_MASK
		| UTMI_TX_AMP_MASK);
	u2o_set(base, UTMI_TX, 3<<UTMI_TX_TXVDD12_SHIFT
		| 4<<UTMI_TX_CK60_PHSEL_SHIFT | 4<<UTMI_TX_IMPCAL_VTH_SHIFT
		| 8<<UTMI_TX_REG_EXT_FS_RCAL_SHIFT | 3<<UTMI_TX_AMP_SHIFT);

	/* UTMI_RX */
	u2o_clear(base, UTMI_RX, UTMI_RX_SQ_THRESH_MASK
		| UTMI_REG_SQ_LENGTH_MASK);
	u2o_set(base, UTMI_RX, 7<<UTMI_RX_SQ_THRESH_SHIFT
		| 2<<UTMI_REG_SQ_LENGTH_SHIFT);

	/* UTMI_IVREF */
	if (pxa_usb_phy->version == PXA_USB_PHY_PXA168) {
		/*

Annotation

Implementation Notes