1 /* 2 * drivers/net/phy/national.c 3 * 4 * Driver for National Semiconductor PHYs 5 * 6 * Author: Stuart Menefy <stuart.menefy@st.com> 7 * Maintainer: Giuseppe Cavallaro <peppe.cavallaro@st.com> 8 * 9 * Copyright (c) 2008 STMicroelectronics Limited 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the 13 * Free Software Foundation; either version 2 of the License, or (at your 14 * option) any later version. 15 * 16 */ 17 18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 19 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/mii.h> 23 #include <linux/ethtool.h> 24 #include <linux/phy.h> 25 #include <linux/netdevice.h> 26 27 #define DEBUG 28 29 /* DP83865 phy identifier values */ 30 #define DP83865_PHY_ID 0x20005c7a 31 32 #define DP83865_INT_STATUS 0x14 33 #define DP83865_INT_MASK 0x15 34 #define DP83865_INT_CLEAR 0x17 35 36 #define DP83865_INT_REMOTE_FAULT 0x0008 37 #define DP83865_INT_ANE_COMPLETED 0x0010 38 #define DP83865_INT_LINK_CHANGE 0xe000 39 #define DP83865_INT_MASK_DEFAULT (DP83865_INT_REMOTE_FAULT | \ 40 DP83865_INT_ANE_COMPLETED | \ 41 DP83865_INT_LINK_CHANGE) 42 43 /* Advanced proprietary configuration */ 44 #define NS_EXP_MEM_CTL 0x16 45 #define NS_EXP_MEM_DATA 0x1d 46 #define NS_EXP_MEM_ADD 0x1e 47 48 #define LED_CTRL_REG 0x13 49 #define AN_FALLBACK_AN 0x0001 50 #define AN_FALLBACK_CRC 0x0002 51 #define AN_FALLBACK_IE 0x0004 52 #define ALL_FALLBACK_ON (AN_FALLBACK_AN | AN_FALLBACK_CRC | AN_FALLBACK_IE) 53 54 enum hdx_loopback { 55 hdx_loopback_on = 0, 56 hdx_loopback_off = 1, 57 }; 58 59 static u8 ns_exp_read(struct phy_device *phydev, u16 reg) 60 { 61 phy_write(phydev, NS_EXP_MEM_ADD, reg); 62 return phy_read(phydev, NS_EXP_MEM_DATA); 63 } 64 65 static void ns_exp_write(struct phy_device *phydev, u16 reg, u8 data) 66 { 67 phy_write(phydev, NS_EXP_MEM_ADD, reg); 68 phy_write(phydev, NS_EXP_MEM_DATA, data); 69 } 70 71 static int ns_config_intr(struct phy_device *phydev) 72 { 73 int err; 74 75 if (phydev->interrupts == PHY_INTERRUPT_ENABLED) 76 err = phy_write(phydev, DP83865_INT_MASK, 77 DP83865_INT_MASK_DEFAULT); 78 else 79 err = phy_write(phydev, DP83865_INT_MASK, 0); 80 81 return err; 82 } 83 84 static int ns_ack_interrupt(struct phy_device *phydev) 85 { 86 int ret = phy_read(phydev, DP83865_INT_STATUS); 87 if (ret < 0) 88 return ret; 89 90 /* Clear the interrupt status bit by writing a “1” 91 * to the corresponding bit in INT_CLEAR (2:0 are reserved) */ 92 ret = phy_write(phydev, DP83865_INT_CLEAR, ret & ~0x7); 93 94 return ret; 95 } 96 97 static void ns_giga_speed_fallback(struct phy_device *phydev, int mode) 98 { 99 int bmcr = phy_read(phydev, MII_BMCR); 100 101 phy_write(phydev, MII_BMCR, (bmcr | BMCR_PDOWN)); 102 103 /* Enable 8 bit expended memory read/write (no auto increment) */ 104 phy_write(phydev, NS_EXP_MEM_CTL, 0); 105 phy_write(phydev, NS_EXP_MEM_ADD, 0x1C0); 106 phy_write(phydev, NS_EXP_MEM_DATA, 0x0008); 107 phy_write(phydev, MII_BMCR, (bmcr & ~BMCR_PDOWN)); 108 phy_write(phydev, LED_CTRL_REG, mode); 109 } 110 111 static void ns_10_base_t_hdx_loopack(struct phy_device *phydev, int disable) 112 { 113 if (disable) 114 ns_exp_write(phydev, 0x1c0, ns_exp_read(phydev, 0x1c0) | 1); 115 else 116 ns_exp_write(phydev, 0x1c0, 117 ns_exp_read(phydev, 0x1c0) & 0xfffe); 118 119 pr_debug("10BASE-T HDX loopback %s\n", 120 (ns_exp_read(phydev, 0x1c0) & 0x0001) ? "off" : "on"); 121 } 122 123 static int ns_config_init(struct phy_device *phydev) 124 { 125 ns_giga_speed_fallback(phydev, ALL_FALLBACK_ON); 126 /* In the latest MAC or switches design, the 10 Mbps loopback 127 is desired to be turned off. */ 128 ns_10_base_t_hdx_loopack(phydev, hdx_loopback_off); 129 return ns_ack_interrupt(phydev); 130 } 131 132 static struct phy_driver dp83865_driver[] = { { 133 .phy_id = DP83865_PHY_ID, 134 .phy_id_mask = 0xfffffff0, 135 .name = "NatSemi DP83865", 136 .features = PHY_GBIT_FEATURES, 137 .flags = PHY_HAS_INTERRUPT, 138 .config_init = ns_config_init, 139 .ack_interrupt = ns_ack_interrupt, 140 .config_intr = ns_config_intr, 141 } }; 142 143 module_phy_driver(dp83865_driver); 144 145 MODULE_DESCRIPTION("NatSemi PHY driver"); 146 MODULE_AUTHOR("Stuart Menefy"); 147 MODULE_LICENSE("GPL"); 148 149 static struct mdio_device_id __maybe_unused ns_tbl[] = { 150 { DP83865_PHY_ID, 0xfffffff0 }, 151 { } 152 }; 153 154 MODULE_DEVICE_TABLE(mdio, ns_tbl); 155