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 #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 54 static 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 61 static 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 94 static 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 } 111 112 static 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 bit 118 */ 119 val = phy_read(phydev, MII_BMCR); 120 if (!(val & BMCR_ANENABLE)) 121 phydev->autoneg = AUTONEG_DISABLE; 122 123 return 0; 124 } 125 126 static 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 }; 133 MODULE_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 } 151 152 static struct phy_driver dp83848_driver[] = { 153 DP83848_PHY_DRIVER(TI_DP83848C_PHY_ID, "TI DP83848C 10/100 Mbps PHY", 154 NULL), 155 DP83848_PHY_DRIVER(NS_DP83848C_PHY_ID, "NS DP83848C 10/100 Mbps PHY", 156 NULL), 157 DP83848_PHY_DRIVER(TI_DP83620_PHY_ID, "TI DP83620 10/100 Mbps PHY", 158 dp83848_config_init), 159 DP83848_PHY_DRIVER(TLK10X_PHY_ID, "TI TLK10X 10/100 Mbps PHY", 160 NULL), 161 }; 162 module_phy_driver(dp83848_driver); 163 164 MODULE_DESCRIPTION("Texas Instruments DP83848 PHY driver"); 165 MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); 166 MODULE_LICENSE("GPL v2"); 167