1 /* 2 * Driver for the Texas Instruments DP83848 PHY 3 * 4 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/ 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 16 #include <linux/module.h> 17 #include <linux/phy.h> 18 19 #define TI_DP83848C_PHY_ID 0x20005ca0 20 #define TI_DP83620_PHY_ID 0x20005ce0 21 #define NS_DP83848C_PHY_ID 0x20005c90 22 #define TLK10X_PHY_ID 0x2000a210 23 24 /* Registers */ 25 #define DP83848_MICR 0x11 /* MII Interrupt Control Register */ 26 #define DP83848_MISR 0x12 /* MII Interrupt Status Register */ 27 28 /* MICR Register Fields */ 29 #define DP83848_MICR_INT_OE BIT(0) /* Interrupt Output Enable */ 30 #define DP83848_MICR_INTEN BIT(1) /* Interrupt Enable */ 31 32 /* MISR Register Fields */ 33 #define DP83848_MISR_RHF_INT_EN BIT(0) /* Receive Error Counter */ 34 #define DP83848_MISR_FHF_INT_EN BIT(1) /* False Carrier Counter */ 35 #define DP83848_MISR_ANC_INT_EN BIT(2) /* Auto-negotiation complete */ 36 #define DP83848_MISR_DUP_INT_EN BIT(3) /* Duplex Status */ 37 #define DP83848_MISR_SPD_INT_EN BIT(4) /* Speed status */ 38 #define DP83848_MISR_LINK_INT_EN BIT(5) /* Link status */ 39 #define DP83848_MISR_ED_INT_EN BIT(6) /* Energy detect */ 40 #define DP83848_MISR_LQM_INT_EN BIT(7) /* Link Quality Monitor */ 41 42 #define DP83848_INT_EN_MASK \ 43 (DP83848_MISR_ANC_INT_EN | \ 44 DP83848_MISR_DUP_INT_EN | \ 45 DP83848_MISR_SPD_INT_EN | \ 46 DP83848_MISR_LINK_INT_EN) 47 48 static int dp83848_ack_interrupt(struct phy_device *phydev) 49 { 50 int err = phy_read(phydev, DP83848_MISR); 51 52 return err < 0 ? err : 0; 53 } 54 55 static int dp83848_config_intr(struct phy_device *phydev) 56 { 57 int control, ret; 58 59 control = phy_read(phydev, DP83848_MICR); 60 if (control < 0) 61 return control; 62 63 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { 64 control |= DP83848_MICR_INT_OE; 65 control |= DP83848_MICR_INTEN; 66 67 ret = phy_write(phydev, DP83848_MISR, DP83848_INT_EN_MASK); 68 if (ret < 0) 69 return ret; 70 } else { 71 control &= ~DP83848_MICR_INTEN; 72 } 73 74 return phy_write(phydev, DP83848_MICR, control); 75 } 76 77 static int dp83848_config_init(struct phy_device *phydev) 78 { 79 int err; 80 int val; 81 82 err = genphy_config_init(phydev); 83 if (err < 0) 84 return err; 85 86 /* DP83620 always reports Auto Negotiation Ability on BMSR. Instead, 87 * we check initial value of BMCR Auto negotiation enable bit 88 */ 89 val = phy_read(phydev, MII_BMCR); 90 if (!(val & BMCR_ANENABLE)) 91 phydev->autoneg = AUTONEG_DISABLE; 92 93 return 0; 94 } 95 96 static struct mdio_device_id __maybe_unused dp83848_tbl[] = { 97 { TI_DP83848C_PHY_ID, 0xfffffff0 }, 98 { NS_DP83848C_PHY_ID, 0xfffffff0 }, 99 { TI_DP83620_PHY_ID, 0xfffffff0 }, 100 { TLK10X_PHY_ID, 0xfffffff0 }, 101 { } 102 }; 103 MODULE_DEVICE_TABLE(mdio, dp83848_tbl); 104 105 #define DP83848_PHY_DRIVER(_id, _name, _config_init) \ 106 { \ 107 .phy_id = _id, \ 108 .phy_id_mask = 0xfffffff0, \ 109 .name = _name, \ 110 .features = PHY_BASIC_FEATURES, \ 111 .flags = PHY_HAS_INTERRUPT, \ 112 \ 113 .soft_reset = genphy_soft_reset, \ 114 .config_init = _config_init, \ 115 .suspend = genphy_suspend, \ 116 .resume = genphy_resume, \ 117 \ 118 /* IRQ related */ \ 119 .ack_interrupt = dp83848_ack_interrupt, \ 120 .config_intr = dp83848_config_intr, \ 121 } 122 123 static struct phy_driver dp83848_driver[] = { 124 DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY", 125 genphy_config_init), 126 DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY", 127 genphy_config_init), 128 DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY", 129 dp83848_config_init), 130 DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY", 131 genphy_config_init), 132 }; 133 module_phy_driver(dp83848_driver); 134 135 MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver"); 136 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); 137 MODULE_LICENSE("GPL"); 138