1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Driver for the Texas Instruments DP83848 PHY
  4 *
  5 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/
  6 */
  7
  8#include <linux/module.h>
  9#include <linux/phy.h>
 10
 11#define TI_DP83848C_PHY_ID		0x20005ca0
 12#define TI_DP83620_PHY_ID		0x20005ce0
 13#define NS_DP83848C_PHY_ID		0x20005c90
 14#define TLK10X_PHY_ID			0x2000a210
 15
 16/* Registers */
 17#define DP83848_MICR			0x11 /* MII Interrupt Control Register */
 18#define DP83848_MISR			0x12 /* MII Interrupt Status Register */
 19
 20/* MICR Register Fields */
 21#define DP83848_MICR_INT_OE		BIT(0) /* Interrupt Output Enable */
 22#define DP83848_MICR_INTEN		BIT(1) /* Interrupt Enable */
 23
 24/* MISR Register Fields */
 25#define DP83848_MISR_RHF_INT_EN		BIT(0) /* Receive Error Counter */
 26#define DP83848_MISR_FHF_INT_EN		BIT(1) /* False Carrier Counter */
 27#define DP83848_MISR_ANC_INT_EN		BIT(2) /* Auto-negotiation complete */
 28#define DP83848_MISR_DUP_INT_EN		BIT(3) /* Duplex Status */
 29#define DP83848_MISR_SPD_INT_EN		BIT(4) /* Speed status */
 30#define DP83848_MISR_LINK_INT_EN	BIT(5) /* Link status */
 31#define DP83848_MISR_ED_INT_EN		BIT(6) /* Energy detect */
 32#define DP83848_MISR_LQM_INT_EN		BIT(7) /* Link Quality Monitor */
 33
 34#define DP83848_INT_EN_MASK		\
 35	(DP83848_MISR_ANC_INT_EN |	\
 36	 DP83848_MISR_DUP_INT_EN |	\
 37	 DP83848_MISR_SPD_INT_EN |	\
 38	 DP83848_MISR_LINK_INT_EN)
 39
 40static int dp83848_ack_interrupt(struct phy_device *phydev)
 41{
 42	int err = phy_read(phydev, DP83848_MISR);
 43
 44	return err < 0 ? err : 0;
 45}
 46
 47static int dp83848_config_intr(struct phy_device *phydev)
 48{
 49	int control, ret;
 50
 51	control = phy_read(phydev, DP83848_MICR);
 52	if (control < 0)
 53		return control;
 54
 55	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
 56		control |= DP83848_MICR_INT_OE;
 57		control |= DP83848_MICR_INTEN;
 58
 59		ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);
 60		if (ret < 0)
 61			return ret;
 62	} else {
 63		control &= ~DP83848_MICR_INTEN;
 64	}
 65
 66	return phy_write(phydev, DP83848_MICR, control);
 67}
 68
 69static int dp83848_config_init(struct phy_device *phydev)
 70{
 71	int val;
 72
 73	/* DP83620 always reports Auto Negotiation Ability on BMSR. Instead,
 74	 * we check initial value of BMCR Auto negotiation enable bit
 75	 */
 76	val = phy_read(phydev, MII_BMCR);
 77	if (!(val & BMCR_ANENABLE))
 78		phydev->autoneg = AUTONEG_DISABLE;
 79
 80	return 0;
 81}
 82
 83static struct mdio_device_id __maybe_unused dp83848_tbl[] = {
 84	{ TI_DP83848C_PHY_ID, 0xfffffff0 },
 85	{ NS_DP83848C_PHY_ID, 0xfffffff0 },
 86	{ TI_DP83620_PHY_ID, 0xfffffff0 },
 87	{ TLK10X_PHY_ID, 0xfffffff0 },
 88	{ }
 89};
 90MODULE_DEVICE_TABLE(mdio, dp83848_tbl);
 91
 92#define DP83848_PHY_DRIVER(_id, _name, _config_init)		\
 93	{							\
 94		.phy_id		= _id,				\
 95		.phy_id_mask	= 0xfffffff0,			\
 96		.name		= _name,			\
 97		/* PHY_BASIC_FEATURES */			\
 98								\
 99		.soft_reset	= genphy_soft_reset,		\
100		.config_init	= _config_init,			\
101		.suspend	= genphy_suspend,		\
102		.resume		= genphy_resume,		\
103								\
104		/* IRQ related */				\
105		.ack_interrupt	= dp83848_ack_interrupt,	\
106		.config_intr	= dp83848_config_intr,		\
107	}
108
109static struct phy_driver dp83848_driver[] = {
110	DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY",
111			   NULL),
112	DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY",
113			   NULL),
114	DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY",
115			   dp83848_config_init),
116	DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY",
117			   NULL),
118};
119module_phy_driver(dp83848_driver);
120
121MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");
122MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
123MODULE_LICENSE("GPL v2");