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358 lines
7.4 KiB
358 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* drivers/net/phy/lxt.c |
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* |
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* Driver for Intel LXT PHYs |
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* |
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* Author: Andy Fleming |
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* |
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* Copyright (c) 2004 Freescale Semiconductor, Inc. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/errno.h> |
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#include <linux/unistd.h> |
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#include <linux/interrupt.h> |
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#include <linux/init.h> |
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#include <linux/delay.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/spinlock.h> |
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#include <linux/mm.h> |
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#include <linux/module.h> |
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#include <linux/mii.h> |
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#include <linux/ethtool.h> |
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#include <linux/phy.h> |
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#include <asm/io.h> |
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#include <asm/irq.h> |
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#include <linux/uaccess.h> |
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/* The Level one LXT970 is used by many boards */ |
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#define MII_LXT970_IER 17 /* Interrupt Enable Register */ |
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#define MII_LXT970_IER_IEN 0x0002 |
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#define MII_LXT970_ISR 18 /* Interrupt Status Register */ |
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#define MII_LXT970_IRS_MINT BIT(15) |
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#define MII_LXT970_CONFIG 19 /* Configuration Register */ |
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/* ------------------------------------------------------------------------- */ |
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/* The Level one LXT971 is used on some of my custom boards */ |
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/* register definitions for the 971 */ |
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#define MII_LXT971_IER 18 /* Interrupt Enable Register */ |
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#define MII_LXT971_IER_IEN 0x00f2 |
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#define MII_LXT971_ISR 19 /* Interrupt Status Register */ |
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#define MII_LXT971_ISR_MASK 0x00f0 |
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/* register definitions for the 973 */ |
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#define MII_LXT973_PCR 16 /* Port Configuration Register */ |
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#define PCR_FIBER_SELECT 1 |
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MODULE_DESCRIPTION("Intel LXT PHY driver"); |
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MODULE_AUTHOR("Andy Fleming"); |
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MODULE_LICENSE("GPL"); |
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static int lxt970_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_LXT970_ISR); |
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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 lxt970_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 = lxt970_ack_interrupt(phydev); |
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if (err) |
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return err; |
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err = phy_write(phydev, MII_LXT970_IER, MII_LXT970_IER_IEN); |
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} else { |
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err = phy_write(phydev, MII_LXT970_IER, 0); |
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if (err) |
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return err; |
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err = lxt970_ack_interrupt(phydev); |
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} |
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return err; |
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} |
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static irqreturn_t lxt970_handle_interrupt(struct phy_device *phydev) |
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{ |
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int irq_status; |
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/* The interrupt status register is cleared by reading BMSR |
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* followed by MII_LXT970_ISR |
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*/ |
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irq_status = phy_read(phydev, MII_BMSR); |
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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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irq_status = phy_read(phydev, MII_LXT970_ISR); |
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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_LXT970_IRS_MINT)) |
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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 int lxt970_config_init(struct phy_device *phydev) |
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{ |
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return phy_write(phydev, MII_LXT970_CONFIG, 0); |
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} |
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static int lxt971_ack_interrupt(struct phy_device *phydev) |
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{ |
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int err = phy_read(phydev, MII_LXT971_ISR); |
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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 lxt971_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 = lxt971_ack_interrupt(phydev); |
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if (err) |
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return err; |
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err = phy_write(phydev, MII_LXT971_IER, MII_LXT971_IER_IEN); |
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} else { |
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err = phy_write(phydev, MII_LXT971_IER, 0); |
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if (err) |
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return err; |
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err = lxt971_ack_interrupt(phydev); |
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} |
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return err; |
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} |
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static irqreturn_t lxt971_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_LXT971_ISR); |
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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_LXT971_ISR_MASK)) |
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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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/* |
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* A2 version of LXT973 chip has an ERRATA: it randomly return the contents |
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* of the previous even register when you read a odd register regularly |
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*/ |
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static int lxt973a2_update_link(struct phy_device *phydev) |
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{ |
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int status; |
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int control; |
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int retry = 8; /* we try 8 times */ |
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/* Do a fake read */ |
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status = phy_read(phydev, MII_BMSR); |
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if (status < 0) |
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return status; |
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control = phy_read(phydev, MII_BMCR); |
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if (control < 0) |
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return control; |
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do { |
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/* Read link and autonegotiation status */ |
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status = phy_read(phydev, MII_BMSR); |
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} while (status >= 0 && retry-- && status == control); |
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if (status < 0) |
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return status; |
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if ((status & BMSR_LSTATUS) == 0) |
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phydev->link = 0; |
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else |
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phydev->link = 1; |
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return 0; |
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} |
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static int lxt973a2_read_status(struct phy_device *phydev) |
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{ |
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int adv; |
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int err; |
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int lpa; |
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/* Update the link, but return if there was an error */ |
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err = lxt973a2_update_link(phydev); |
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if (err) |
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return err; |
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if (AUTONEG_ENABLE == phydev->autoneg) { |
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int retry = 1; |
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adv = phy_read(phydev, MII_ADVERTISE); |
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if (adv < 0) |
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return adv; |
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do { |
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lpa = phy_read(phydev, MII_LPA); |
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if (lpa < 0) |
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return lpa; |
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/* If both registers are equal, it is suspect but not |
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* impossible, hence a new try |
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*/ |
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} while (lpa == adv && retry--); |
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mii_lpa_to_linkmode_lpa_t(phydev->lp_advertising, lpa); |
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lpa &= adv; |
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phydev->speed = SPEED_10; |
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phydev->duplex = DUPLEX_HALF; |
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phydev->pause = phydev->asym_pause = 0; |
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if (lpa & (LPA_100FULL | LPA_100HALF)) { |
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phydev->speed = SPEED_100; |
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if (lpa & LPA_100FULL) |
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phydev->duplex = DUPLEX_FULL; |
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} else { |
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if (lpa & LPA_10FULL) |
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phydev->duplex = DUPLEX_FULL; |
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} |
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phy_resolve_aneg_pause(phydev); |
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} else { |
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err = genphy_read_status_fixed(phydev); |
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if (err < 0) |
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return err; |
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phydev->pause = phydev->asym_pause = 0; |
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linkmode_zero(phydev->lp_advertising); |
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} |
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return 0; |
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} |
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static int lxt973_probe(struct phy_device *phydev) |
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{ |
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int val = phy_read(phydev, MII_LXT973_PCR); |
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if (val & PCR_FIBER_SELECT) { |
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/* |
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* If fiber is selected, then the only correct setting |
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* is 100Mbps, full duplex, and auto negotiation off. |
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*/ |
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val = phy_read(phydev, MII_BMCR); |
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val |= (BMCR_SPEED100 | BMCR_FULLDPLX); |
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val &= ~BMCR_ANENABLE; |
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phy_write(phydev, MII_BMCR, val); |
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/* Remember that the port is in fiber mode. */ |
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phydev->priv = lxt973_probe; |
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phydev->port = PORT_FIBRE; |
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} else { |
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phydev->priv = NULL; |
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} |
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return 0; |
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} |
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static int lxt973_config_aneg(struct phy_device *phydev) |
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{ |
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/* Do nothing if port is in fiber mode. */ |
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return phydev->priv ? 0 : genphy_config_aneg(phydev); |
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} |
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static struct phy_driver lxt97x_driver[] = { |
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{ |
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.phy_id = 0x78100000, |
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.name = "LXT970", |
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.phy_id_mask = 0xfffffff0, |
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/* PHY_BASIC_FEATURES */ |
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.config_init = lxt970_config_init, |
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.config_intr = lxt970_config_intr, |
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.handle_interrupt = lxt970_handle_interrupt, |
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}, { |
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.phy_id = 0x001378e0, |
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.name = "LXT971", |
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.phy_id_mask = 0xfffffff0, |
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/* PHY_BASIC_FEATURES */ |
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.config_intr = lxt971_config_intr, |
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.handle_interrupt = lxt971_handle_interrupt, |
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.suspend = genphy_suspend, |
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.resume = genphy_resume, |
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}, { |
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.phy_id = 0x00137a10, |
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.name = "LXT973-A2", |
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.phy_id_mask = 0xffffffff, |
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/* PHY_BASIC_FEATURES */ |
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.flags = 0, |
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.probe = lxt973_probe, |
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.config_aneg = lxt973_config_aneg, |
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.read_status = lxt973a2_read_status, |
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.suspend = genphy_suspend, |
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.resume = genphy_resume, |
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}, { |
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.phy_id = 0x00137a10, |
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.name = "LXT973", |
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.phy_id_mask = 0xfffffff0, |
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/* PHY_BASIC_FEATURES */ |
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.flags = 0, |
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.probe = lxt973_probe, |
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.config_aneg = lxt973_config_aneg, |
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.suspend = genphy_suspend, |
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.resume = genphy_resume, |
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} }; |
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module_phy_driver(lxt97x_driver); |
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static struct mdio_device_id __maybe_unused lxt_tbl[] = { |
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{ 0x78100000, 0xfffffff0 }, |
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{ 0x001378e0, 0xfffffff0 }, |
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{ 0x00137a10, 0xfffffff0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(mdio, lxt_tbl);
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