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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