drivers/net/phy/dp83848.c

Source file repositories/reference/linux-study-clean/drivers/net/phy/dp83848.c

File Facts

System
Linux kernel
Corpus path
drivers/net/phy/dp83848.c
Extension
.c
Size
4529 bytes
Lines
169
Domain
Driver Families
Bucket
drivers/net
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

// SPDX-License-Identifier: GPL-2.0
/*
 * Driver for the Texas Instruments DP83848 PHY
 *
 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
 */

#include <linux/module.h>
#include <linux/phy.h>

#define TI_DP83848C_PHY_ID		0x20005ca0
#define TI_DP83620_PHY_ID		0x20005ce0
#define NS_DP83848C_PHY_ID		0x20005c90
#define TLK10X_PHY_ID			0x2000a210

/* Registers */
#define DP83848_MICR			0x11 /* MII Interrupt Control Register */
#define DP83848_MISR			0x12 /* MII Interrupt Status Register */

/* MICR Register Fields */
#define DP83848_MICR_INT_OE		BIT(0) /* Interrupt Output Enable */
#define DP83848_MICR_INTEN		BIT(1) /* Interrupt Enable */

/* MISR Register Fields */
#define DP83848_MISR_RHF_INT_EN		BIT(0) /* Receive Error Counter */
#define DP83848_MISR_FHF_INT_EN		BIT(1) /* False Carrier Counter */
#define DP83848_MISR_ANC_INT_EN		BIT(2) /* Auto-negotiation complete */
#define DP83848_MISR_DUP_INT_EN		BIT(3) /* Duplex Status */
#define DP83848_MISR_SPD_INT_EN		BIT(4) /* Speed status */
#define DP83848_MISR_LINK_INT_EN	BIT(5) /* Link status */
#define DP83848_MISR_ED_INT_EN		BIT(6) /* Energy detect */
#define DP83848_MISR_LQM_INT_EN		BIT(7) /* Link Quality Monitor */

#define DP83848_INT_EN_MASK		\
	(DP83848_MISR_ANC_INT_EN |	\
	 DP83848_MISR_DUP_INT_EN |	\
	 DP83848_MISR_SPD_INT_EN |	\
	 DP83848_MISR_LINK_INT_EN)

#define DP83848_MISR_RHF_INT		BIT(8)
#define DP83848_MISR_FHF_INT		BIT(9)
#define DP83848_MISR_ANC_INT		BIT(10)
#define DP83848_MISR_DUP_INT		BIT(11)
#define DP83848_MISR_SPD_INT		BIT(12)
#define DP83848_MISR_LINK_INT		BIT(13)
#define DP83848_MISR_ED_INT		BIT(14)

#define DP83848_INT_MASK		\
	(DP83848_MISR_ANC_INT |	\
	 DP83848_MISR_DUP_INT |	\
	 DP83848_MISR_SPD_INT |	\
	 DP83848_MISR_LINK_INT)

static int dp83848_ack_interrupt(struct phy_device *phydev)
{
	int err = phy_read(phydev, DP83848_MISR);

	return err < 0 ? err : 0;
}

static int dp83848_config_intr(struct phy_device *phydev)
{
	int control, ret;

	control = phy_read(phydev, DP83848_MICR);
	if (control < 0)
		return control;

	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
		ret = dp83848_ack_interrupt(phydev);
		if (ret)
			return ret;

		control |= DP83848_MICR_INT_OE;
		control |= DP83848_MICR_INTEN;

		ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
		if (ret < 0)
			return ret;

		ret = phy_write(phydev, DP83848_MICR, control);
	} else {
		control &= ~DP83848_MICR_INTEN;
		ret = phy_write(phydev, DP83848_MICR, control);
		if (ret)
			return ret;

		ret = dp83848_ack_interrupt(phydev);
	}

Annotation

Implementation Notes