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 40 static 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 47 static 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 69 static int dp83848_config_init(struct phy_device *phydev) 70 { 71 int err; 72 int val; 73 74 err = genphy_config_init(phydev); 75 if (err < 0) 76 return err; 77 78 /* DP83620 always reports Auto Negotiation Ability on BMSR. Instead, 79 * we check initial value of BMCR Auto negotiation enable bit 80 */ 81 val = phy_read(phydev, MII_BMCR); 82 if (!(val & BMCR_ANENABLE)) 83 phydev->autoneg = AUTONEG_DISABLE; 84 85 return 0; 86 } 87 88 static struct mdio_device_id __maybe_unused dp83848_tbl[] = { 89 { TI_DP83848C_PHY_ID, 0xfffffff0 }, 90 { NS_DP83848C_PHY_ID, 0xfffffff0 }, 91 { TI_DP83620_PHY_ID, 0xfffffff0 }, 92 { TLK10X_PHY_ID, 0xfffffff0 }, 93 { } 94 }; 95 MODULE_DEVICE_TABLE(mdio, dp83848_tbl); 96 97 #define DP83848_PHY_DRIVER(_id, _name, _config_init) \ 98 { \ 99 .phy_id = _id, \ 100 .phy_id_mask = 0xfffffff0, \ 101 .name = _name, \ 102 /* PHY_BASIC_FEATURES */ \ 103 \ 104 .soft_reset = genphy_soft_reset, \ 105 .config_init = _config_init, \ 106 .suspend = genphy_suspend, \ 107 .resume = genphy_resume, \ 108 \ 109 /* IRQ related */ \ 110 .ack_interrupt = dp83848_ack_interrupt, \ 111 .config_intr = dp83848_config_intr, \ 112 } 113 114 static struct phy_driver dp83848_driver[] = { 115 DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY", 116 genphy_config_init), 117 DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY", 118 genphy_config_init), 119 DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY", 120 dp83848_config_init), 121 DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY", 122 genphy_config_init), 123 }; 124 module_phy_driver(dp83848_driver); 125 126 MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver"); 127 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); 128 MODULE_LICENSE("GPL v2"); 129