1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2017 NXP 4 * 5 * CORTINA is a registered trademark of Cortina Systems, Inc. 6 * 7 */ 8 #include <linux/module.h> 9 #include <linux/phy.h> 10 11 #define PHY_ID_CS4340 0x13e51002 12 13 #define VILLA_GLOBAL_CHIP_ID_LSB 0x0 14 #define VILLA_GLOBAL_CHIP_ID_MSB 0x1 15 16 #define VILLA_GLOBAL_GPIO_1_INTS 0x017 17 18 static int cortina_read_reg(struct phy_device *phydev, u16 regnum) 19 { 20 return mdiobus_c45_read(phydev->mdio.bus, phydev->mdio.addr, 0, regnum); 21 } 22 23 static int cortina_read_status(struct phy_device *phydev) 24 { 25 int gpio_int_status, ret = 0; 26 27 gpio_int_status = cortina_read_reg(phydev, VILLA_GLOBAL_GPIO_1_INTS); 28 if (gpio_int_status < 0) { 29 ret = gpio_int_status; 30 goto err; 31 } 32 33 if (gpio_int_status & 0x8) { 34 /* up when edc_convergedS set */ 35 phydev->speed = SPEED_10000; 36 phydev->duplex = DUPLEX_FULL; 37 phydev->link = 1; 38 } else { 39 phydev->link = 0; 40 } 41 42 err: 43 return ret; 44 } 45 46 static int cortina_probe(struct phy_device *phydev) 47 { 48 u32 phy_id = 0; 49 int id_lsb = 0, id_msb = 0; 50 51 /* Read device id from phy registers. */ 52 id_lsb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_LSB); 53 if (id_lsb < 0) 54 return -ENXIO; 55 56 phy_id = id_lsb << 16; 57 58 id_msb = cortina_read_reg(phydev, VILLA_GLOBAL_CHIP_ID_MSB); 59 if (id_msb < 0) 60 return -ENXIO; 61 62 phy_id |= id_msb; 63 64 /* Make sure the device tree binding matched the driver with the 65 * right device. 66 */ 67 if (phy_id != phydev->drv->phy_id) { 68 phydev_err(phydev, "Error matching phy with %s driver\n", 69 phydev->drv->name); 70 return -ENODEV; 71 } 72 73 return 0; 74 } 75 76 static struct phy_driver cortina_driver[] = { 77 { 78 .phy_id = PHY_ID_CS4340, 79 .phy_id_mask = 0xffffffff, 80 .name = "Cortina CS4340", 81 .features = PHY_10GBIT_FEATURES, 82 .config_aneg = gen10g_config_aneg, 83 .read_status = cortina_read_status, 84 .probe = cortina_probe, 85 }, 86 }; 87 88 module_phy_driver(cortina_driver); 89 90 static struct mdio_device_id __maybe_unused cortina_tbl[] = { 91 { PHY_ID_CS4340, 0xffffffff}, 92 {}, 93 }; 94 95 MODULE_DEVICE_TABLE(mdio, cortina_tbl); 96 97 MODULE_DESCRIPTION("Cortina EDC CDR 10G Ethernet PHY driver"); 98 MODULE_AUTHOR("NXP"); 99 MODULE_LICENSE("GPL"); 100