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1// SPDX-License-Identifier: GPL-2.02/*3 * Driver for the Texas Instruments DP83848 PHY4 *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		0x20005ca012#define TI_DP83620_PHY_ID		0x20005ce013#define NS_DP83848C_PHY_ID		0x20005c9014#define TLK10X_PHY_ID			0x2000a21015 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 40#define DP83848_MISR_RHF_INT		BIT(8)41#define DP83848_MISR_FHF_INT		BIT(9)42#define DP83848_MISR_ANC_INT		BIT(10)43#define DP83848_MISR_DUP_INT		BIT(11)44#define DP83848_MISR_SPD_INT		BIT(12)45#define DP83848_MISR_LINK_INT		BIT(13)46#define DP83848_MISR_ED_INT		BIT(14)47 48#define DP83848_INT_MASK		\49	(DP83848_MISR_ANC_INT |	\50	 DP83848_MISR_DUP_INT |	\51	 DP83848_MISR_SPD_INT |	\52	 DP83848_MISR_LINK_INT)53 54static int dp83848_ack_interrupt(struct phy_device *phydev)55{56	int err = phy_read(phydev, DP83848_MISR);57 58	return err < 0 ? err : 0;59}60 61static int dp83848_config_intr(struct phy_device *phydev)62{63	int control, ret;64 65	control = phy_read(phydev, DP83848_MICR);66	if (control < 0)67		return control;68 69	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {70		ret = dp83848_ack_interrupt(phydev);71		if (ret)72			return ret;73 74		control |= DP83848_MICR_INT_OE;75		control |= DP83848_MICR_INTEN;76 77		ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK);78		if (ret < 0)79			return ret;80 81		ret = phy_write(phydev, DP83848_MICR, control);82	} else {83		control &= ~DP83848_MICR_INTEN;84		ret = phy_write(phydev, DP83848_MICR, control);85		if (ret)86			return ret;87 88		ret = dp83848_ack_interrupt(phydev);89	}90 91	return ret;92}93 94static irqreturn_t dp83848_handle_interrupt(struct phy_device *phydev)95{96	int irq_status;97 98	irq_status = phy_read(phydev, DP83848_MISR);99	if (irq_status < 0) {100		phy_error(phydev);101		return IRQ_NONE;102	}103 104	if (!(irq_status & DP83848_INT_MASK))105		return IRQ_NONE;106 107	phy_trigger_machine(phydev);108 109	return IRQ_HANDLED;110}111 112static int dp83848_config_init(struct phy_device *phydev)113{114	int val;115 116	/* DP83620 always reports Auto Negotiation Ability on BMSR. Instead,117	 * we check initial value of BMCR Auto negotiation enable bit118	 */119	val = phy_read(phydev, MII_BMCR);120	if (!(val & BMCR_ANENABLE))121		phydev->autoneg = AUTONEG_DISABLE;122 123	return 0;124}125 126static struct mdio_device_id __maybe_unused dp83848_tbl[] = {127	{ TI_DP83848C_PHY_ID, 0xfffffff0 },128	{ NS_DP83848C_PHY_ID, 0xfffffff0 },129	{ TI_DP83620_PHY_ID, 0xfffffff0 },130	{ TLK10X_PHY_ID, 0xfffffff0 },131	{ }132};133MODULE_DEVICE_TABLE(mdio, dp83848_tbl);134 135#define DP83848_PHY_DRIVER(_id, _name, _config_init)		\136	{							\137		.phy_id		= _id,				\138		.phy_id_mask	= 0xfffffff0,			\139		.name		= _name,			\140		/* PHY_BASIC_FEATURES */			\141								\142		.soft_reset	= genphy_soft_reset,		\143		.config_init	= _config_init,			\144		.suspend	= genphy_suspend,		\145		.resume		= genphy_resume,		\146								\147		/* IRQ related */				\148		.config_intr	= dp83848_config_intr,		\149		.handle_interrupt = dp83848_handle_interrupt,	\150								\151		.flags		= PHY_RST_AFTER_CLK_EN,		\152	}153 154static struct phy_driver dp83848_driver[] = {155	DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY",156			   NULL),157	DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY",158			   NULL),159	DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY",160			   dp83848_config_init),161	DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY",162			   NULL),163};164module_phy_driver(dp83848_driver);165 166MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver");167MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");168MODULE_LICENSE("GPL v2");169