// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 1999 - 2010 Intel Corporation.
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* Copyright (C) 2010 OKI SEMICONDUCTOR Co., LTD.
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*
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* This code was derived from the Intel e1000e Linux driver.
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*/
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#include "pch_gbe.h"
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#include "pch_gbe_phy.h"
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#define PHY_MAX_REG_ADDRESS 0x1F /* 5 bit address bus (0-0x1F) */
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/* PHY 1000 MII Register/Bit Definitions */
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/* PHY Registers defined by IEEE */
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#define PHY_CONTROL 0x00 /* Control Register */
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#define PHY_STATUS 0x01 /* Status Regiser */
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#define PHY_ID1 0x02 /* Phy Id Register (word 1) */
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#define PHY_ID2 0x03 /* Phy Id Register (word 2) */
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#define PHY_AUTONEG_ADV 0x04 /* Autoneg Advertisement */
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#define PHY_LP_ABILITY 0x05 /* Link Partner Ability (Base Page) */
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#define PHY_AUTONEG_EXP 0x06 /* Autoneg Expansion Register */
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#define PHY_NEXT_PAGE_TX 0x07 /* Next Page TX */
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#define PHY_LP_NEXT_PAGE 0x08 /* Link Partner Next Page */
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#define PHY_1000T_CTRL 0x09 /* 1000Base-T Control Register */
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#define PHY_1000T_STATUS 0x0A /* 1000Base-T Status Register */
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#define PHY_EXT_STATUS 0x0F /* Extended Status Register */
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#define PHY_PHYSP_CONTROL 0x10 /* PHY Specific Control Register */
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#define PHY_EXT_PHYSP_CONTROL 0x14 /* Extended PHY Specific Control Register */
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#define PHY_LED_CONTROL 0x18 /* LED Control Register */
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#define PHY_EXT_PHYSP_STATUS 0x1B /* Extended PHY Specific Status Register */
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/* PHY Control Register */
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#define MII_CR_SPEED_SELECT_MSB 0x0040 /* bits 6,13: 10=1000, 01=100, 00=10 */
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#define MII_CR_COLL_TEST_ENABLE 0x0080 /* Collision test enable */
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#define MII_CR_FULL_DUPLEX 0x0100 /* FDX =1, half duplex =0 */
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#define MII_CR_RESTART_AUTO_NEG 0x0200 /* Restart auto negotiation */
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#define MII_CR_ISOLATE 0x0400 /* Isolate PHY from MII */
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#define MII_CR_POWER_DOWN 0x0800 /* Power down */
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#define MII_CR_AUTO_NEG_EN 0x1000 /* Auto Neg Enable */
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#define MII_CR_SPEED_SELECT_LSB 0x2000 /* bits 6,13: 10=1000, 01=100, 00=10 */
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#define MII_CR_LOOPBACK 0x4000 /* 0 = normal, 1 = loopback */
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#define MII_CR_RESET 0x8000 /* 0 = normal, 1 = PHY reset */
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#define MII_CR_SPEED_1000 0x0040
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#define MII_CR_SPEED_100 0x2000
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#define MII_CR_SPEED_10 0x0000
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/* PHY Status Register */
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#define MII_SR_EXTENDED_CAPS 0x0001 /* Extended register capabilities */
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#define MII_SR_JABBER_DETECT 0x0002 /* Jabber Detected */
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#define MII_SR_LINK_STATUS 0x0004 /* Link Status 1 = link */
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#define MII_SR_AUTONEG_CAPS 0x0008 /* Auto Neg Capable */
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#define MII_SR_REMOTE_FAULT 0x0010 /* Remote Fault Detect */
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#define MII_SR_AUTONEG_COMPLETE 0x0020 /* Auto Neg Complete */
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#define MII_SR_PREAMBLE_SUPPRESS 0x0040 /* Preamble may be suppressed */
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#define MII_SR_EXTENDED_STATUS 0x0100 /* Ext. status info in Reg 0x0F */
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#define MII_SR_100T2_HD_CAPS 0x0200 /* 100T2 Half Duplex Capable */
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#define MII_SR_100T2_FD_CAPS 0x0400 /* 100T2 Full Duplex Capable */
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#define MII_SR_10T_HD_CAPS 0x0800 /* 10T Half Duplex Capable */
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#define MII_SR_10T_FD_CAPS 0x1000 /* 10T Full Duplex Capable */
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#define MII_SR_100X_HD_CAPS 0x2000 /* 100X Half Duplex Capable */
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#define MII_SR_100X_FD_CAPS 0x4000 /* 100X Full Duplex Capable */
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#define MII_SR_100T4_CAPS 0x8000 /* 100T4 Capable */
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/* AR8031 PHY Debug Registers */
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#define PHY_AR803X_ID 0x00001374
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#define PHY_AR8031_DBG_OFF 0x1D
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#define PHY_AR8031_DBG_DAT 0x1E
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#define PHY_AR8031_SERDES 0x05
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#define PHY_AR8031_HIBERNATE 0x0B
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#define PHY_AR8031_SERDES_TX_CLK_DLY 0x0100 /* TX clock delay of 2.0ns */
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#define PHY_AR8031_PS_HIB_EN 0x8000 /* Hibernate enable */
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/* Phy Id Register (word 2) */
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#define PHY_REVISION_MASK 0x000F
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/* PHY Specific Control Register */
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#define PHYSP_CTRL_ASSERT_CRS_TX 0x0800
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/* Default value of PHY register */
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#define PHY_CONTROL_DEFAULT 0x1140 /* Control Register */
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#define PHY_AUTONEG_ADV_DEFAULT 0x01e0 /* Autoneg Advertisement */
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#define PHY_NEXT_PAGE_TX_DEFAULT 0x2001 /* Next Page TX */
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#define PHY_1000T_CTRL_DEFAULT 0x0300 /* 1000Base-T Control Register */
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#define PHY_PHYSP_CONTROL_DEFAULT 0x01EE /* PHY Specific Control Register */
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/**
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* pch_gbe_phy_get_id - Retrieve the PHY ID and revision
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* @hw: Pointer to the HW structure
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* Returns
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* 0: Successful.
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* Negative value: Failed.
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*/
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s32 pch_gbe_phy_get_id(struct pch_gbe_hw *hw)
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{
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struct pch_gbe_adapter *adapter = pch_gbe_hw_to_adapter(hw);
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struct pch_gbe_phy_info *phy = &hw->phy;
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s32 ret;
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u16 phy_id1;
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u16 phy_id2;
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ret = pch_gbe_phy_read_reg_miic(hw, PHY_ID1, &phy_id1);
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if (ret)
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return ret;
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ret = pch_gbe_phy_read_reg_miic(hw, PHY_ID2, &phy_id2);
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if (ret)
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return ret;
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/*
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* PHY_ID1: [bit15-0:ID(21-6)]
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* PHY_ID2: [bit15-10:ID(5-0)][bit9-4:Model][bit3-0:revision]
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*/
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phy->id = (u32)phy_id1;
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phy->id = ((phy->id << 6) | ((phy_id2 & 0xFC00) >> 10));
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phy->revision = (u32) (phy_id2 & 0x000F);
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netdev_dbg(adapter->netdev,
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"phy->id : 0x%08x phy->revision : 0x%08x\n",
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phy->id, phy->revision);
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return 0;
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}
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/**
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* pch_gbe_phy_read_reg_miic - Read MII control register
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* @hw: Pointer to the HW structure
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* @offset: Register offset to be read
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* @data: Pointer to the read data
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* Returns
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* 0: Successful.
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* -EINVAL: Invalid argument.
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*/
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s32 pch_gbe_phy_read_reg_miic(struct pch_gbe_hw *hw, u32 offset, u16 *data)
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{
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struct pch_gbe_phy_info *phy = &hw->phy;
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if (offset > PHY_MAX_REG_ADDRESS) {
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struct pch_gbe_adapter *adapter = pch_gbe_hw_to_adapter(hw);
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netdev_err(adapter->netdev, "PHY Address %d is out of range\n",
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offset);
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return -EINVAL;
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}
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*data = pch_gbe_mac_ctrl_miim(hw, phy->addr, PCH_GBE_HAL_MIIM_READ,
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offset, (u16)0);
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return 0;
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}
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/**
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* pch_gbe_phy_write_reg_miic - Write MII control register
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* @hw: Pointer to the HW structure
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* @offset: Register offset to be read
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* @data: data to write to register at offset
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* Returns
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* 0: Successful.
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* -EINVAL: Invalid argument.
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*/
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s32 pch_gbe_phy_write_reg_miic(struct pch_gbe_hw *hw, u32 offset, u16 data)
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{
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struct pch_gbe_phy_info *phy = &hw->phy;
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if (offset > PHY_MAX_REG_ADDRESS) {
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struct pch_gbe_adapter *adapter = pch_gbe_hw_to_adapter(hw);
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netdev_err(adapter->netdev, "PHY Address %d is out of range\n",
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offset);
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return -EINVAL;
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}
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pch_gbe_mac_ctrl_miim(hw, phy->addr, PCH_GBE_HAL_MIIM_WRITE,
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offset, data);
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return 0;
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}
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/**
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* pch_gbe_phy_sw_reset - PHY software reset
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* @hw: Pointer to the HW structure
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*/
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static void pch_gbe_phy_sw_reset(struct pch_gbe_hw *hw)
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{
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u16 phy_ctrl;
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pch_gbe_phy_read_reg_miic(hw, PHY_CONTROL, &phy_ctrl);
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phy_ctrl |= MII_CR_RESET;
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pch_gbe_phy_write_reg_miic(hw, PHY_CONTROL, phy_ctrl);
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udelay(1);
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}
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/**
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* pch_gbe_phy_hw_reset - PHY hardware reset
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* @hw: Pointer to the HW structure
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*/
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void pch_gbe_phy_hw_reset(struct pch_gbe_hw *hw)
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{
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pch_gbe_phy_write_reg_miic(hw, PHY_CONTROL, PHY_CONTROL_DEFAULT);
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pch_gbe_phy_write_reg_miic(hw, PHY_AUTONEG_ADV,
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PHY_AUTONEG_ADV_DEFAULT);
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pch_gbe_phy_write_reg_miic(hw, PHY_NEXT_PAGE_TX,
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PHY_NEXT_PAGE_TX_DEFAULT);
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pch_gbe_phy_write_reg_miic(hw, PHY_1000T_CTRL, PHY_1000T_CTRL_DEFAULT);
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pch_gbe_phy_write_reg_miic(hw, PHY_PHYSP_CONTROL,
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PHY_PHYSP_CONTROL_DEFAULT);
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}
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/**
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* pch_gbe_phy_power_up - restore link in case the phy was powered down
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* @hw: Pointer to the HW structure
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*/
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void pch_gbe_phy_power_up(struct pch_gbe_hw *hw)
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{
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u16 mii_reg;
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mii_reg = 0;
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/* Just clear the power down bit to wake the phy back up */
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/* according to the manual, the phy will retain its
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* settings across a power-down/up cycle */
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pch_gbe_phy_read_reg_miic(hw, PHY_CONTROL, &mii_reg);
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mii_reg &= ~MII_CR_POWER_DOWN;
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pch_gbe_phy_write_reg_miic(hw, PHY_CONTROL, mii_reg);
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}
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/**
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* pch_gbe_phy_power_down - Power down PHY
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* @hw: Pointer to the HW structure
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*/
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void pch_gbe_phy_power_down(struct pch_gbe_hw *hw)
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{
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u16 mii_reg;
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mii_reg = 0;
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/* Power down the PHY so no link is implied when interface is down *
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* The PHY cannot be powered down if any of the following is TRUE *
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* (a) WoL is enabled
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* (b) AMT is active
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*/
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pch_gbe_phy_read_reg_miic(hw, PHY_CONTROL, &mii_reg);
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mii_reg |= MII_CR_POWER_DOWN;
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pch_gbe_phy_write_reg_miic(hw, PHY_CONTROL, mii_reg);
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mdelay(1);
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}
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/**
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* pch_gbe_phy_set_rgmii - RGMII interface setting
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* @hw: Pointer to the HW structure
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*/
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void pch_gbe_phy_set_rgmii(struct pch_gbe_hw *hw)
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{
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pch_gbe_phy_sw_reset(hw);
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}
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/**
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* pch_gbe_phy_tx_clk_delay - Setup TX clock delay via the PHY
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* @hw: Pointer to the HW structure
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* Returns
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* 0: Successful.
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* -EINVAL: Invalid argument.
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*/
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static int pch_gbe_phy_tx_clk_delay(struct pch_gbe_hw *hw)
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{
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/* The RGMII interface requires a ~2ns TX clock delay. This is typically
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* done in layout with a longer trace or via PHY strapping, but can also
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* be done via PHY configuration registers.
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*/
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struct pch_gbe_adapter *adapter = pch_gbe_hw_to_adapter(hw);
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u16 mii_reg;
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int ret = 0;
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switch (hw->phy.id) {
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case PHY_AR803X_ID:
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netdev_dbg(adapter->netdev,
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"Configuring AR803X PHY for 2ns TX clock delay\n");
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pch_gbe_phy_read_reg_miic(hw, PHY_AR8031_DBG_OFF, &mii_reg);
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ret = pch_gbe_phy_write_reg_miic(hw, PHY_AR8031_DBG_OFF,
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PHY_AR8031_SERDES);
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if (ret)
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break;
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pch_gbe_phy_read_reg_miic(hw, PHY_AR8031_DBG_DAT, &mii_reg);
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mii_reg |= PHY_AR8031_SERDES_TX_CLK_DLY;
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ret = pch_gbe_phy_write_reg_miic(hw, PHY_AR8031_DBG_DAT,
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mii_reg);
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break;
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default:
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netdev_err(adapter->netdev,
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"Unknown PHY (%x), could not set TX clock delay\n",
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hw->phy.id);
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return -EINVAL;
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}
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if (ret)
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netdev_err(adapter->netdev,
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"Could not configure tx clock delay for PHY\n");
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return ret;
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}
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/**
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* pch_gbe_phy_init_setting - PHY initial setting
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* @hw: Pointer to the HW structure
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*/
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void pch_gbe_phy_init_setting(struct pch_gbe_hw *hw)
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{
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struct pch_gbe_adapter *adapter = pch_gbe_hw_to_adapter(hw);
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struct ethtool_cmd cmd = { .cmd = ETHTOOL_GSET };
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int ret;
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u16 mii_reg;
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ret = mii_ethtool_gset(&adapter->mii, &cmd);
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if (ret)
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netdev_err(adapter->netdev, "Error: mii_ethtool_gset\n");
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ethtool_cmd_speed_set(&cmd, hw->mac.link_speed);
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cmd.duplex = hw->mac.link_duplex;
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cmd.advertising = hw->phy.autoneg_advertised;
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cmd.autoneg = hw->mac.autoneg;
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pch_gbe_phy_write_reg_miic(hw, MII_BMCR, BMCR_RESET);
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ret = mii_ethtool_sset(&adapter->mii, &cmd);
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if (ret)
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netdev_err(adapter->netdev, "Error: mii_ethtool_sset\n");
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pch_gbe_phy_sw_reset(hw);
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pch_gbe_phy_read_reg_miic(hw, PHY_PHYSP_CONTROL, &mii_reg);
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mii_reg |= PHYSP_CTRL_ASSERT_CRS_TX;
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pch_gbe_phy_write_reg_miic(hw, PHY_PHYSP_CONTROL, mii_reg);
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/* Setup a TX clock delay on certain platforms */
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if (adapter->pdata && adapter->pdata->phy_tx_clk_delay)
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pch_gbe_phy_tx_clk_delay(hw);
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}
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/**
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* pch_gbe_phy_disable_hibernate - Disable the PHY low power state
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* @hw: Pointer to the HW structure
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* Returns
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* 0: Successful.
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* -EINVAL: Invalid argument.
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*/
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int pch_gbe_phy_disable_hibernate(struct pch_gbe_hw *hw)
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{
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struct pch_gbe_adapter *adapter = pch_gbe_hw_to_adapter(hw);
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u16 mii_reg;
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int ret = 0;
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switch (hw->phy.id) {
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case PHY_AR803X_ID:
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netdev_dbg(adapter->netdev,
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"Disabling hibernation for AR803X PHY\n");
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ret = pch_gbe_phy_write_reg_miic(hw, PHY_AR8031_DBG_OFF,
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PHY_AR8031_HIBERNATE);
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if (ret)
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break;
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pch_gbe_phy_read_reg_miic(hw, PHY_AR8031_DBG_DAT, &mii_reg);
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mii_reg &= ~PHY_AR8031_PS_HIB_EN;
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ret = pch_gbe_phy_write_reg_miic(hw, PHY_AR8031_DBG_DAT,
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mii_reg);
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break;
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default:
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netdev_err(adapter->netdev,
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"Unknown PHY (%x), could not disable hibernation\n",
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hw->phy.id);
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return -EINVAL;
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}
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if (ret)
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netdev_err(adapter->netdev,
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"Could not disable PHY hibernation\n");
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return ret;
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}
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