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107 lines
2.3 KiB
107 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Driver for AMD am79c PHYs |
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* |
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* Author: Heiko Schocher <[email protected]> |
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* |
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* Copyright (c) 2011 DENX Software Engineering GmbH |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/mii.h> |
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#include <linux/phy.h> |
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#define PHY_ID_AM79C874 0x0022561b |
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#define MII_AM79C_IR 17 /* Interrupt Status/Control Register */ |
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#define MII_AM79C_IR_EN_LINK 0x0400 /* IR enable Linkstate */ |
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#define MII_AM79C_IR_EN_ANEG 0x0100 /* IR enable Aneg Complete */ |
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#define MII_AM79C_IR_IMASK_INIT (MII_AM79C_IR_EN_LINK | MII_AM79C_IR_EN_ANEG) |
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#define MII_AM79C_IR_LINK_DOWN BIT(2) |
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#define MII_AM79C_IR_ANEG_DONE BIT(0) |
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#define MII_AM79C_IR_IMASK_STAT (MII_AM79C_IR_LINK_DOWN | MII_AM79C_IR_ANEG_DONE) |
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MODULE_DESCRIPTION("AMD PHY driver"); |
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MODULE_AUTHOR("Heiko Schocher <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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static int am79c_ack_interrupt(struct phy_device *phydev) |
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{ |
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int err; |
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err = phy_read(phydev, MII_BMSR); |
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if (err < 0) |
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return err; |
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err = phy_read(phydev, MII_AM79C_IR); |
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if (err < 0) |
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return err; |
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return 0; |
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} |
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static int am79c_config_init(struct phy_device *phydev) |
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{ |
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return 0; |
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} |
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static int am79c_config_intr(struct phy_device *phydev) |
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{ |
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int err; |
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if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { |
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err = am79c_ack_interrupt(phydev); |
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if (err) |
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return err; |
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err = phy_write(phydev, MII_AM79C_IR, MII_AM79C_IR_IMASK_INIT); |
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} else { |
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err = phy_write(phydev, MII_AM79C_IR, 0); |
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if (err) |
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return err; |
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err = am79c_ack_interrupt(phydev); |
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} |
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return err; |
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} |
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static irqreturn_t am79c_handle_interrupt(struct phy_device *phydev) |
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{ |
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int irq_status; |
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irq_status = phy_read(phydev, MII_AM79C_IR); |
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if (irq_status < 0) { |
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phy_error(phydev); |
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return IRQ_NONE; |
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} |
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if (!(irq_status & MII_AM79C_IR_IMASK_STAT)) |
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return IRQ_NONE; |
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phy_trigger_machine(phydev); |
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return IRQ_HANDLED; |
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} |
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static struct phy_driver am79c_driver[] = { { |
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.phy_id = PHY_ID_AM79C874, |
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.name = "AM79C874", |
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.phy_id_mask = 0xfffffff0, |
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/* PHY_BASIC_FEATURES */ |
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.config_init = am79c_config_init, |
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.config_intr = am79c_config_intr, |
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.handle_interrupt = am79c_handle_interrupt, |
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} }; |
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module_phy_driver(am79c_driver); |
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static struct mdio_device_id __maybe_unused amd_tbl[] = { |
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{ PHY_ID_AM79C874, 0xfffffff0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(mdio, amd_tbl);
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