606 lines
14 KiB
C
606 lines
14 KiB
C
// 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 <hvr@gnu.org>
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*
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* Support added for SMSC LAN8187 and LAN8700 by steve.glendinning@shawell.net
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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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#define EDPD_MAX_WAIT_DFLT_MS 640
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/* interval between phylib state machine runs in ms */
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#define PHY_STATE_MACH_MS 1000
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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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unsigned int edpd_enable:1;
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unsigned int edpd_mode_set_by_user:1;
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unsigned int edpd_max_wait_ms;
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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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int smsc_phy_config_intr(struct phy_device *phydev)
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{
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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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rc = phy_write(phydev, MII_LAN83C185_IM,
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MII_LAN83C185_ISF_INT_PHYLIB_EVENTS);
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} else {
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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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EXPORT_SYMBOL_GPL(smsc_phy_config_intr);
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static int smsc_phy_config_edpd(struct phy_device *phydev)
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{
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struct smsc_phy_priv *priv = phydev->priv;
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if (priv->edpd_enable)
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return phy_set_bits(phydev, MII_LAN83C185_CTRL_STATUS,
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MII_LAN83C185_EDPWRDOWN);
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else
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return phy_clear_bits(phydev, MII_LAN83C185_CTRL_STATUS,
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MII_LAN83C185_EDPWRDOWN);
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}
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irqreturn_t smsc_phy_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_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 & MII_LAN83C185_ISF_INT_PHYLIB_EVENTS))
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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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EXPORT_SYMBOL_GPL(smsc_phy_handle_interrupt);
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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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if (!priv)
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return 0;
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/* don't use EDPD in irq mode except overridden by user */
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if (!priv->edpd_mode_set_by_user && phydev->irq != PHY_POLL)
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priv->edpd_enable = false;
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return smsc_phy_config_edpd(phydev);
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}
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EXPORT_SYMBOL_GPL(smsc_phy_config_init);
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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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if (phydev->phy_id == 0x0007c0f0) { /* LAN9500A or LAN9505A */
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/* Extend Manual AutoMDIX timer */
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int rc = phy_set_bits(phydev, PHY_EDPD_CONFIG,
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PHY_EDPD_CONFIG_EXT_CROSSOVER_);
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if (rc < 0)
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return rc;
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}
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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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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;
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err = genphy_read_status(phydev);
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if (err)
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return err;
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if (!phydev->link && priv && priv->edpd_enable &&
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priv->edpd_max_wait_ms) {
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unsigned int max_wait = priv->edpd_max_wait_ms * 1000;
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int rc;
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/* Disable EDPD to wake up PHY */
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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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/* 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, max_wait, 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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EXPORT_SYMBOL_GPL(lan87xx_read_status);
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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_get_edpd(struct phy_device *phydev, u16 *edpd)
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{
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struct smsc_phy_priv *priv = phydev->priv;
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if (!priv)
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return -EOPNOTSUPP;
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if (!priv->edpd_enable)
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*edpd = ETHTOOL_PHY_EDPD_DISABLE;
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else if (!priv->edpd_max_wait_ms)
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*edpd = ETHTOOL_PHY_EDPD_NO_TX;
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else
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*edpd = PHY_STATE_MACH_MS + priv->edpd_max_wait_ms;
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return 0;
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}
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static int smsc_phy_set_edpd(struct phy_device *phydev, u16 edpd)
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{
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struct smsc_phy_priv *priv = phydev->priv;
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if (!priv)
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return -EOPNOTSUPP;
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switch (edpd) {
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case ETHTOOL_PHY_EDPD_DISABLE:
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priv->edpd_enable = false;
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break;
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case ETHTOOL_PHY_EDPD_NO_TX:
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priv->edpd_enable = true;
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priv->edpd_max_wait_ms = 0;
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break;
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case ETHTOOL_PHY_EDPD_DFLT_TX_MSECS:
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edpd = PHY_STATE_MACH_MS + EDPD_MAX_WAIT_DFLT_MS;
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fallthrough;
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default:
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if (phydev->irq != PHY_POLL)
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return -EOPNOTSUPP;
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if (edpd < PHY_STATE_MACH_MS || edpd > PHY_STATE_MACH_MS + 1000)
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return -EINVAL;
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priv->edpd_enable = true;
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priv->edpd_max_wait_ms = edpd - PHY_STATE_MACH_MS;
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}
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priv->edpd_mode_set_by_user = true;
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return smsc_phy_config_edpd(phydev);
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}
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int smsc_phy_get_tunable(struct phy_device *phydev,
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struct ethtool_tunable *tuna, void *data)
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{
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switch (tuna->id) {
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case ETHTOOL_PHY_EDPD:
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return smsc_phy_get_edpd(phydev, data);
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default:
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return -EOPNOTSUPP;
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}
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}
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EXPORT_SYMBOL_GPL(smsc_phy_get_tunable);
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int smsc_phy_set_tunable(struct phy_device *phydev,
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struct ethtool_tunable *tuna, const void *data)
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{
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switch (tuna->id) {
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case ETHTOOL_PHY_EDPD:
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return smsc_phy_set_edpd(phydev, *(u16 *)data);
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default:
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return -EOPNOTSUPP;
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}
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}
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EXPORT_SYMBOL_GPL(smsc_phy_set_tunable);
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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 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->edpd_enable = true;
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priv->edpd_max_wait_ms = EDPD_MAX_WAIT_DFLT_MS;
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if (device_property_present(dev, "smsc,disable-energy-detect"))
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priv->edpd_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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EXPORT_SYMBOL_GPL(smsc_phy_probe);
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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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.get_tunable = smsc_phy_get_tunable,
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.set_tunable = smsc_phy_set_tunable,
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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 */
|
|
.config_intr = smsc_phy_config_intr,
|
|
.handle_interrupt = smsc_phy_handle_interrupt,
|
|
|
|
/* Statistics */
|
|
.get_sset_count = smsc_get_sset_count,
|
|
.get_strings = smsc_get_strings,
|
|
.get_stats = smsc_get_stats,
|
|
|
|
.get_tunable = smsc_phy_get_tunable,
|
|
.set_tunable = smsc_phy_set_tunable,
|
|
|
|
.suspend = genphy_suspend,
|
|
.resume = genphy_resume,
|
|
}, {
|
|
.phy_id = 0x0007c110,
|
|
.phy_id_mask = 0xfffffff0,
|
|
.name = "SMSC LAN8740",
|
|
|
|
/* PHY_BASIC_FEATURES */
|
|
.flags = PHY_RST_AFTER_CLK_EN,
|
|
|
|
.probe = smsc_phy_probe,
|
|
|
|
/* basic functions */
|
|
.read_status = lan87xx_read_status,
|
|
.config_init = smsc_phy_config_init,
|
|
.soft_reset = smsc_phy_reset,
|
|
|
|
/* IRQ related */
|
|
.config_intr = smsc_phy_config_intr,
|
|
.handle_interrupt = smsc_phy_handle_interrupt,
|
|
|
|
/* Statistics */
|
|
.get_sset_count = smsc_get_sset_count,
|
|
.get_strings = smsc_get_strings,
|
|
.get_stats = smsc_get_stats,
|
|
|
|
.get_tunable = smsc_phy_get_tunable,
|
|
.set_tunable = smsc_phy_set_tunable,
|
|
|
|
.suspend = genphy_suspend,
|
|
.resume = genphy_resume,
|
|
}, {
|
|
.phy_id = 0x0007c130, /* 0x0007c130 and 0x0007c131 */
|
|
/* This mask (0xfffffff2) is to differentiate from
|
|
* LAN88xx (phy_id 0x0007c132)
|
|
* and allows future phy_id revisions.
|
|
*/
|
|
.phy_id_mask = 0xfffffff2,
|
|
.name = "Microchip LAN8742",
|
|
|
|
/* PHY_BASIC_FEATURES */
|
|
.flags = PHY_RST_AFTER_CLK_EN,
|
|
|
|
.probe = smsc_phy_probe,
|
|
|
|
/* basic functions */
|
|
.read_status = lan87xx_read_status,
|
|
.config_init = smsc_phy_config_init,
|
|
.soft_reset = smsc_phy_reset,
|
|
|
|
/* IRQ related */
|
|
.config_intr = smsc_phy_config_intr,
|
|
.handle_interrupt = smsc_phy_handle_interrupt,
|
|
|
|
/* Statistics */
|
|
.get_sset_count = smsc_get_sset_count,
|
|
.get_strings = smsc_get_strings,
|
|
.get_stats = smsc_get_stats,
|
|
|
|
.get_tunable = smsc_phy_get_tunable,
|
|
.set_tunable = smsc_phy_set_tunable,
|
|
|
|
.suspend = genphy_suspend,
|
|
.resume = genphy_resume,
|
|
} };
|
|
|
|
module_phy_driver(smsc_phy_driver);
|
|
|
|
MODULE_DESCRIPTION("SMSC PHY driver");
|
|
MODULE_AUTHOR("Herbert Valerio Riedel");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static struct mdio_device_id __maybe_unused smsc_tbl[] = {
|
|
{ 0x0007c0a0, 0xfffffff0 },
|
|
{ 0x0007c0b0, 0xfffffff0 },
|
|
{ 0x0007c0c0, 0xfffffff0 },
|
|
{ 0x0007c0d0, 0xfffffff0 },
|
|
{ 0x0007c0f0, 0xfffffff0 },
|
|
{ 0x0007c110, 0xfffffff0 },
|
|
{ 0x0007c130, 0xfffffff2 },
|
|
{ }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(mdio, smsc_tbl);
|