1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * drivers/net/phy/national.c 4 * 5 * Driver for National Semiconductor PHYs 6 * 7 * Author: Stuart Menefy <stuart.menefy@st.com> 8 * Maintainer: Giuseppe Cavallaro <peppe.cavallaro@st.com> 9 * 10 * Copyright (c) 2008 STMicroelectronics Limited 11 */ 12 13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/mii.h> 18 #include <linux/ethtool.h> 19 #include <linux/phy.h> 20 #include <linux/netdevice.h> 21 22 #define DEBUG 23 24 /* DP83865 phy identifier values */ 25 #define DP83865_PHY_ID 0x20005c7a 26 27 #define DP83865_INT_STATUS 0x14 28 #define DP83865_INT_MASK 0x15 29 #define DP83865_INT_CLEAR 0x17 30 31 #define DP83865_INT_REMOTE_FAULT 0x0008 32 #define DP83865_INT_ANE_COMPLETED 0x0010 33 #define DP83865_INT_LINK_CHANGE 0xe000 34 #define DP83865_INT_MASK_DEFAULT (DP83865_INT_REMOTE_FAULT | \ 35 DP83865_INT_ANE_COMPLETED | \ 36 DP83865_INT_LINK_CHANGE) 37 38 /* Advanced proprietary configuration */ 39 #define NS_EXP_MEM_CTL 0x16 40 #define NS_EXP_MEM_DATA 0x1d 41 #define NS_EXP_MEM_ADD 0x1e 42 43 #define LED_CTRL_REG 0x13 44 #define AN_FALLBACK_AN 0x0001 45 #define AN_FALLBACK_CRC 0x0002 46 #define AN_FALLBACK_IE 0x0004 47 #define ALL_FALLBACK_ON (AN_FALLBACK_AN | AN_FALLBACK_CRC | AN_FALLBACK_IE) 48 49 enum hdx_loopback { 50 hdx_loopback_on = 0, 51 hdx_loopback_off = 1, 52 }; 53 54 static u8 ns_exp_read(struct phy_device *phydev, u16 reg) 55 { 56 phy_write(phydev, NS_EXP_MEM_ADD, reg); 57 return phy_read(phydev, NS_EXP_MEM_DATA); 58 } 59 60 static void ns_exp_write(struct phy_device *phydev, u16 reg, u8 data) 61 { 62 phy_write(phydev, NS_EXP_MEM_ADD, reg); 63 phy_write(phydev, NS_EXP_MEM_DATA, data); 64 } 65 66 static int ns_config_intr(struct phy_device *phydev) 67 { 68 int err; 69 70 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) 71 err = phy_write(phydev, DP83865_INT_MASK, 72 DP83865_INT_MASK_DEFAULT); 73 else 74 err = phy_write(phydev, DP83865_INT_MASK, 0); 75 76 return err; 77 } 78 79 static int ns_ack_interrupt(struct phy_device *phydev) 80 { 81 int ret = phy_read(phydev, DP83865_INT_STATUS); 82 if (ret < 0) 83 return ret; 84 85 /* Clear the interrupt status bit by writing a “1” 86 * to the corresponding bit in INT_CLEAR (2:0 are reserved) */ 87 ret = phy_write(phydev, DP83865_INT_CLEAR, ret & ~0x7); 88 89 return ret; 90 } 91 92 static void ns_giga_speed_fallback(struct phy_device *phydev, int mode) 93 { 94 int bmcr = phy_read(phydev, MII_BMCR); 95 96 phy_write(phydev, MII_BMCR, (bmcr | BMCR_PDOWN)); 97 98 /* Enable 8 bit expended memory read/write (no auto increment) */ 99 phy_write(phydev, NS_EXP_MEM_CTL, 0); 100 phy_write(phydev, NS_EXP_MEM_ADD, 0x1C0); 101 phy_write(phydev, NS_EXP_MEM_DATA, 0x0008); 102 phy_write(phydev, MII_BMCR, (bmcr & ~BMCR_PDOWN)); 103 phy_write(phydev, LED_CTRL_REG, mode); 104 } 105 106 static void ns_10_base_t_hdx_loopack(struct phy_device *phydev, int disable) 107 { 108 if (disable) 109 ns_exp_write(phydev, 0x1c0, ns_exp_read(phydev, 0x1c0) | 1); 110 else 111 ns_exp_write(phydev, 0x1c0, 112 ns_exp_read(phydev, 0x1c0) & 0xfffe); 113 114 pr_debug("10BASE-T HDX loopback %s\n", 115 (ns_exp_read(phydev, 0x1c0) & 0x0001) ? "off" : "on"); 116 } 117 118 static int ns_config_init(struct phy_device *phydev) 119 { 120 ns_giga_speed_fallback(phydev, ALL_FALLBACK_ON); 121 /* In the latest MAC or switches design, the 10 Mbps loopback 122 is desired to be turned off. */ 123 ns_10_base_t_hdx_loopack(phydev, hdx_loopback_off); 124 return ns_ack_interrupt(phydev); 125 } 126 127 static struct phy_driver dp83865_driver[] = { { 128 .phy_id = DP83865_PHY_ID, 129 .phy_id_mask = 0xfffffff0, 130 .name = "NatSemi DP83865", 131 /* PHY_GBIT_FEATURES */ 132 .config_init = ns_config_init, 133 .ack_interrupt = ns_ack_interrupt, 134 .config_intr = ns_config_intr, 135 } }; 136 137 module_phy_driver(dp83865_driver); 138 139 MODULE_DESCRIPTION("NatSemi PHY driver"); 140 MODULE_AUTHOR("Stuart Menefy"); 141 MODULE_LICENSE("GPL"); 142 143 static struct mdio_device_id __maybe_unused ns_tbl[] = { 144 { DP83865_PHY_ID, 0xfffffff0 }, 145 { } 146 }; 147 148 MODULE_DEVICE_TABLE(mdio, ns_tbl); 149