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506 lines
12 KiB
506 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* drivers/net/phy/smsc.c |
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* |
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* Driver for SMSC PHYs |
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* |
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* Author: Herbert Valerio Riedel |
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* |
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* Copyright (c) 2006 Herbert Valerio Riedel <[email protected]> |
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* |
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* Support added for SMSC LAN8187 and LAN8700 by [email protected] |
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* |
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*/ |
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#include <linux/clk.h> |
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#include <linux/kernel.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/of.h> |
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#include <linux/phy.h> |
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#include <linux/netdevice.h> |
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#include <linux/smscphy.h> |
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/* Vendor-specific PHY Definitions */ |
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/* EDPD NLP / crossover time configuration */ |
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#define PHY_EDPD_CONFIG 16 |
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#define PHY_EDPD_CONFIG_EXT_CROSSOVER_ 0x0001 |
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/* Control/Status Indication Register */ |
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#define SPECIAL_CTRL_STS 27 |
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#define SPECIAL_CTRL_STS_OVRRD_AMDIX_ 0x8000 |
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#define SPECIAL_CTRL_STS_AMDIX_ENABLE_ 0x4000 |
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#define SPECIAL_CTRL_STS_AMDIX_STATE_ 0x2000 |
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struct smsc_hw_stat { |
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const char *string; |
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u8 reg; |
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u8 bits; |
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}; |
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static struct smsc_hw_stat smsc_hw_stats[] = { |
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{ "phy_symbol_errors", 26, 16}, |
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}; |
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struct smsc_phy_priv { |
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u16 intmask; |
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bool energy_enable; |
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}; |
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static int smsc_phy_ack_interrupt(struct phy_device *phydev) |
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{ |
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int rc = phy_read(phydev, MII_LAN83C185_ISF); |
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return rc < 0 ? rc : 0; |
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} |
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static int smsc_phy_config_intr(struct phy_device *phydev) |
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{ |
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struct smsc_phy_priv *priv = phydev->priv; |
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int rc; |
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if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { |
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rc = smsc_phy_ack_interrupt(phydev); |
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if (rc) |
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return rc; |
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priv->intmask = MII_LAN83C185_ISF_INT4 | MII_LAN83C185_ISF_INT6; |
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if (priv->energy_enable) |
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priv->intmask |= MII_LAN83C185_ISF_INT7; |
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rc = phy_write(phydev, MII_LAN83C185_IM, priv->intmask); |
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} else { |
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priv->intmask = 0; |
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rc = phy_write(phydev, MII_LAN83C185_IM, 0); |
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if (rc) |
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return rc; |
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rc = smsc_phy_ack_interrupt(phydev); |
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} |
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return rc < 0 ? rc : 0; |
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} |
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static irqreturn_t smsc_phy_handle_interrupt(struct phy_device *phydev) |
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{ |
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struct smsc_phy_priv *priv = phydev->priv; |
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int irq_status; |
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irq_status = phy_read(phydev, MII_LAN83C185_ISF); |
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if (irq_status < 0) { |
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if (irq_status != -ENODEV) |
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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 & priv->intmask)) |
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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 smsc_phy_config_init(struct phy_device *phydev) |
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{ |
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struct smsc_phy_priv *priv = phydev->priv; |
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int rc; |
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if (!priv->energy_enable || phydev->irq != PHY_POLL) |
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return 0; |
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rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS); |
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if (rc < 0) |
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return rc; |
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/* Enable energy detect mode for this SMSC Transceivers */ |
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rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS, |
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rc | MII_LAN83C185_EDPWRDOWN); |
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return rc; |
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} |
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static int smsc_phy_reset(struct phy_device *phydev) |
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{ |
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int rc = phy_read(phydev, MII_LAN83C185_SPECIAL_MODES); |
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if (rc < 0) |
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return rc; |
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/* If the SMSC PHY is in power down mode, then set it |
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* in all capable mode before using it. |
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*/ |
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if ((rc & MII_LAN83C185_MODE_MASK) == MII_LAN83C185_MODE_POWERDOWN) { |
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/* set "all capable" mode */ |
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rc |= MII_LAN83C185_MODE_ALL; |
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phy_write(phydev, MII_LAN83C185_SPECIAL_MODES, rc); |
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} |
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/* reset the phy */ |
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return genphy_soft_reset(phydev); |
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} |
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static int lan87xx_config_aneg(struct phy_device *phydev) |
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{ |
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int rc; |
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int val; |
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switch (phydev->mdix_ctrl) { |
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case ETH_TP_MDI: |
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val = SPECIAL_CTRL_STS_OVRRD_AMDIX_; |
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break; |
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case ETH_TP_MDI_X: |
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val = SPECIAL_CTRL_STS_OVRRD_AMDIX_ | |
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SPECIAL_CTRL_STS_AMDIX_STATE_; |
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break; |
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case ETH_TP_MDI_AUTO: |
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val = SPECIAL_CTRL_STS_AMDIX_ENABLE_; |
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break; |
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default: |
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return genphy_config_aneg(phydev); |
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} |
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rc = phy_read(phydev, SPECIAL_CTRL_STS); |
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if (rc < 0) |
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return rc; |
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rc &= ~(SPECIAL_CTRL_STS_OVRRD_AMDIX_ | |
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SPECIAL_CTRL_STS_AMDIX_ENABLE_ | |
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SPECIAL_CTRL_STS_AMDIX_STATE_); |
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rc |= val; |
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phy_write(phydev, SPECIAL_CTRL_STS, rc); |
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phydev->mdix = phydev->mdix_ctrl; |
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return genphy_config_aneg(phydev); |
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} |
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static int lan95xx_config_aneg_ext(struct phy_device *phydev) |
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{ |
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int rc; |
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if (phydev->phy_id != 0x0007c0f0) /* not (LAN9500A or LAN9505A) */ |
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return lan87xx_config_aneg(phydev); |
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/* Extend Manual AutoMDIX timer */ |
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rc = phy_read(phydev, PHY_EDPD_CONFIG); |
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if (rc < 0) |
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return rc; |
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rc |= PHY_EDPD_CONFIG_EXT_CROSSOVER_; |
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phy_write(phydev, PHY_EDPD_CONFIG, rc); |
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return lan87xx_config_aneg(phydev); |
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} |
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/* |
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* The LAN87xx suffers from rare absence of the ENERGYON-bit when Ethernet cable |
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* plugs in while LAN87xx is in Energy Detect Power-Down mode. This leads to |
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* unstable detection of plugging in Ethernet cable. |
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* This workaround disables Energy Detect Power-Down mode and waiting for |
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* response on link pulses to detect presence of plugged Ethernet cable. |
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* The Energy Detect Power-Down mode is enabled again in the end of procedure to |
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* save approximately 220 mW of power if cable is unplugged. |
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* The workaround is only applicable to poll mode. Energy Detect Power-Down may |
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* not be used in interrupt mode lest link change detection becomes unreliable. |
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*/ |
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static int lan87xx_read_status(struct phy_device *phydev) |
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{ |
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struct smsc_phy_priv *priv = phydev->priv; |
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int err = genphy_read_status(phydev); |
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if (!phydev->link && priv->energy_enable && phydev->irq == PHY_POLL) { |
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/* Disable EDPD to wake up PHY */ |
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int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS); |
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if (rc < 0) |
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return rc; |
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rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS, |
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rc & ~MII_LAN83C185_EDPWRDOWN); |
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if (rc < 0) |
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return rc; |
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/* Wait max 640 ms to detect energy and the timeout is not |
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* an actual error. |
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*/ |
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read_poll_timeout(phy_read, rc, |
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rc & MII_LAN83C185_ENERGYON || rc < 0, |
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10000, 640000, true, phydev, |
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MII_LAN83C185_CTRL_STATUS); |
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if (rc < 0) |
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return rc; |
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/* Re-enable EDPD */ |
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rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS); |
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if (rc < 0) |
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return rc; |
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rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS, |
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rc | MII_LAN83C185_EDPWRDOWN); |
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if (rc < 0) |
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return rc; |
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} |
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return err; |
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} |
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static int smsc_get_sset_count(struct phy_device *phydev) |
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{ |
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return ARRAY_SIZE(smsc_hw_stats); |
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} |
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static void smsc_get_strings(struct phy_device *phydev, u8 *data) |
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{ |
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int i; |
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for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++) { |
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strncpy(data + i * ETH_GSTRING_LEN, |
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smsc_hw_stats[i].string, ETH_GSTRING_LEN); |
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} |
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} |
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static u64 smsc_get_stat(struct phy_device *phydev, int i) |
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{ |
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struct smsc_hw_stat stat = smsc_hw_stats[i]; |
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int val; |
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u64 ret; |
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val = phy_read(phydev, stat.reg); |
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if (val < 0) |
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ret = U64_MAX; |
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else |
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ret = val; |
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return ret; |
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} |
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static void smsc_get_stats(struct phy_device *phydev, |
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struct ethtool_stats *stats, u64 *data) |
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{ |
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int i; |
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for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++) |
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data[i] = smsc_get_stat(phydev, i); |
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} |
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static int smsc_phy_probe(struct phy_device *phydev) |
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{ |
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struct device *dev = &phydev->mdio.dev; |
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struct device_node *of_node = dev->of_node; |
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struct smsc_phy_priv *priv; |
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struct clk *refclk; |
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->energy_enable = true; |
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if (of_property_read_bool(of_node, "smsc,disable-energy-detect")) |
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priv->energy_enable = false; |
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phydev->priv = priv; |
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/* Make clk optional to keep DTB backward compatibility. */ |
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refclk = devm_clk_get_optional_enabled(dev, NULL); |
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if (IS_ERR(refclk)) |
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return dev_err_probe(dev, PTR_ERR(refclk), |
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"Failed to request clock\n"); |
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return clk_set_rate(refclk, 50 * 1000 * 1000); |
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} |
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static struct phy_driver smsc_phy_driver[] = { |
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{ |
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.phy_id = 0x0007c0a0, /* OUI=0x00800f, Model#=0x0a */ |
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.phy_id_mask = 0xfffffff0, |
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.name = "SMSC LAN83C185", |
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/* PHY_BASIC_FEATURES */ |
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.probe = smsc_phy_probe, |
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/* basic functions */ |
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.config_init = smsc_phy_config_init, |
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.soft_reset = smsc_phy_reset, |
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/* IRQ related */ |
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.config_intr = smsc_phy_config_intr, |
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.handle_interrupt = smsc_phy_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 = 0x0007c0b0, /* OUI=0x00800f, Model#=0x0b */ |
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.phy_id_mask = 0xfffffff0, |
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.name = "SMSC LAN8187", |
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/* PHY_BASIC_FEATURES */ |
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.probe = smsc_phy_probe, |
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/* basic functions */ |
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.config_init = smsc_phy_config_init, |
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.soft_reset = smsc_phy_reset, |
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/* IRQ related */ |
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.config_intr = smsc_phy_config_intr, |
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.handle_interrupt = smsc_phy_handle_interrupt, |
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/* Statistics */ |
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.get_sset_count = smsc_get_sset_count, |
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.get_strings = smsc_get_strings, |
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.get_stats = smsc_get_stats, |
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.suspend = genphy_suspend, |
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.resume = genphy_resume, |
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}, { |
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/* This covers internal PHY (phy_id: 0x0007C0C3) for |
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* LAN9500 (PID: 0x9500), LAN9514 (PID: 0xec00), LAN9505 (PID: 0x9505) |
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*/ |
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.phy_id = 0x0007c0c0, /* OUI=0x00800f, Model#=0x0c */ |
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.phy_id_mask = 0xfffffff0, |
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.name = "SMSC LAN8700", |
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/* PHY_BASIC_FEATURES */ |
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.probe = smsc_phy_probe, |
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/* basic functions */ |
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.read_status = lan87xx_read_status, |
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.config_init = smsc_phy_config_init, |
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.soft_reset = smsc_phy_reset, |
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.config_aneg = lan87xx_config_aneg, |
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/* IRQ related */ |
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.config_intr = smsc_phy_config_intr, |
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.handle_interrupt = smsc_phy_handle_interrupt, |
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/* Statistics */ |
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.get_sset_count = smsc_get_sset_count, |
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.get_strings = smsc_get_strings, |
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.get_stats = smsc_get_stats, |
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.suspend = genphy_suspend, |
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.resume = genphy_resume, |
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}, { |
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.phy_id = 0x0007c0d0, /* OUI=0x00800f, Model#=0x0d */ |
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.phy_id_mask = 0xfffffff0, |
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.name = "SMSC LAN911x Internal PHY", |
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/* PHY_BASIC_FEATURES */ |
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.probe = smsc_phy_probe, |
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/* IRQ related */ |
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.config_intr = smsc_phy_config_intr, |
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.handle_interrupt = smsc_phy_handle_interrupt, |
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.suspend = genphy_suspend, |
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.resume = genphy_resume, |
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}, { |
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/* This covers internal PHY (phy_id: 0x0007C0F0) for |
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* LAN9500A (PID: 0x9E00), LAN9505A (PID: 0x9E01) |
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*/ |
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.phy_id = 0x0007c0f0, /* OUI=0x00800f, Model#=0x0f */ |
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.phy_id_mask = 0xfffffff0, |
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.name = "SMSC LAN8710/LAN8720", |
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/* PHY_BASIC_FEATURES */ |
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.probe = smsc_phy_probe, |
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/* basic functions */ |
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.read_status = lan87xx_read_status, |
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.config_init = smsc_phy_config_init, |
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.soft_reset = smsc_phy_reset, |
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.config_aneg = lan95xx_config_aneg_ext, |
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/* IRQ related */ |
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.config_intr = smsc_phy_config_intr, |
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.handle_interrupt = smsc_phy_handle_interrupt, |
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/* Statistics */ |
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.get_sset_count = smsc_get_sset_count, |
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.get_strings = smsc_get_strings, |
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.get_stats = smsc_get_stats, |
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.suspend = genphy_suspend, |
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.resume = genphy_resume, |
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}, { |
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.phy_id = 0x0007c110, |
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.phy_id_mask = 0xfffffff0, |
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.name = "SMSC LAN8740", |
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/* PHY_BASIC_FEATURES */ |
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.flags = PHY_RST_AFTER_CLK_EN, |
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.probe = smsc_phy_probe, |
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/* basic functions */ |
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.read_status = lan87xx_read_status, |
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.config_init = smsc_phy_config_init, |
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.soft_reset = smsc_phy_reset, |
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/* IRQ related */ |
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.config_intr = smsc_phy_config_intr, |
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.handle_interrupt = smsc_phy_handle_interrupt, |
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/* Statistics */ |
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.get_sset_count = smsc_get_sset_count, |
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.get_strings = smsc_get_strings, |
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.get_stats = smsc_get_stats, |
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.suspend = genphy_suspend, |
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.resume = genphy_resume, |
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}, { |
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.phy_id = 0x0007c130, /* 0x0007c130 and 0x0007c131 */ |
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/* This mask (0xfffffff2) is to differentiate from |
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* LAN88xx (phy_id 0x0007c132) |
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* and allows future phy_id revisions. |
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*/ |
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.phy_id_mask = 0xfffffff2, |
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.name = "Microchip LAN8742", |
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/* PHY_BASIC_FEATURES */ |
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.flags = PHY_RST_AFTER_CLK_EN, |
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.probe = smsc_phy_probe, |
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/* basic functions */ |
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.read_status = lan87xx_read_status, |
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.config_init = smsc_phy_config_init, |
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.soft_reset = smsc_phy_reset, |
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/* IRQ related */ |
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.config_intr = smsc_phy_config_intr, |
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.handle_interrupt = smsc_phy_handle_interrupt, |
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/* Statistics */ |
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.get_sset_count = smsc_get_sset_count, |
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.get_strings = smsc_get_strings, |
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.get_stats = smsc_get_stats, |
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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(smsc_phy_driver); |
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MODULE_DESCRIPTION("SMSC PHY driver"); |
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MODULE_AUTHOR("Herbert Valerio Riedel"); |
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MODULE_LICENSE("GPL"); |
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static struct mdio_device_id __maybe_unused smsc_tbl[] = { |
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{ 0x0007c0a0, 0xfffffff0 }, |
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{ 0x0007c0b0, 0xfffffff0 }, |
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{ 0x0007c0c0, 0xfffffff0 }, |
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{ 0x0007c0d0, 0xfffffff0 }, |
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{ 0x0007c0f0, 0xfffffff0 }, |
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{ 0x0007c110, 0xfffffff0 }, |
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{ 0x0007c130, 0xfffffff2 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(mdio, smsc_tbl);
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