/* * drivers/net/phy/phy.c * * Framework for configuring and reading PHY devices * Based on code in sungem_phy.c and gianfar_phy.c * * Author: Andy Fleming * * Copyright (c) 2004 Freescale Semiconductor, Inc. * Copyright (c) 2006, 2007 Maciej W. Rozycki * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h>#include <linux/string.h>#include <linux/errno.h>#include <linux/unistd.h>#include <linux/interrupt.h>#include <linux/init.h>#include <linux/delay.h>#include <linux/netdevice.h>#include <linux/etherdevice.h>#include <linux/skbuff.h>#include <linux/mm.h>#include <linux/module.h>#include <linux/mii.h>#include <linux/ethtool.h>#include <linux/phy.h>#include <linux/timer.h>#include <linux/workqueue.h>#include <linux/mdio.h> #include <linux/atomic.h>#include <asm/io.h>#include <asm/irq.h>#include <asm/uaccess.h> /** * phy_print_status - Convenience function to print out the current phy status * @phydev: the phy_device struct */void phy_print_status(struct phy_device *phydev){ if (phydev->link) pr_info("%s - Link is Up - %d/%s\n", dev_name(&phydev->dev), phydev->speed, DUPLEX_FULL == phydev->duplex ? "Full" : "Half"); else pr_info("%s - Link is Down\n", dev_name(&phydev->dev));}EXPORT_SYMBOL(phy_print_status); /** * phy_clear_interrupt - Ack the phy device's interrupt * @phydev: the phy_device struct * * If the @phydev driver has an ack_interrupt function, call it to * ack and clear the phy device's interrupt. * * Returns 0 on success on < 0 on error. */static int phy_clear_interrupt(struct phy_device *phydev){ int err = 0; if (phydev->drv->ack_interrupt) err = phydev->drv->ack_interrupt(phydev); return err;} /** * phy_config_interrupt - configure the PHY device for the requested interrupts * @phydev: the phy_device struct * @interrupts: interrupt flags to configure for this @phydev * * Returns 0 on success on < 0 on error. */static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts){ int err = 0; phydev->interrupts = interrupts; if (phydev->drv->config_intr) err = phydev->drv->config_intr(phydev); return err;} /** * phy_aneg_done - return auto-negotiation status * @phydev: target phy_device struct * * Description: Reads the status register and returns 0 either if * auto-negotiation is incomplete, or if there was an error. * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. */static inline int phy_aneg_done(struct phy_device *phydev){ int retval; retval = phy_read(phydev, MII_BMSR); return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);} /* A structure for mapping a particular speed and duplex * combination to a particular SUPPORTED and ADVERTISED value */struct phy_setting { int speed; int duplex; u32 setting;}; /* A mapping of all SUPPORTED settings to speed/duplex */static const struct phy_setting settings[] = { { .speed = 10000, .duplex = DUPLEX_FULL, .setting = SUPPORTED_10000baseT_Full, }, { .speed = SPEED_1000, .duplex = DUPLEX_FULL, .setting = SUPPORTED_1000baseT_Full, }, { .speed = SPEED_1000, .duplex = DUPLEX_HALF, .setting = SUPPORTED_1000baseT_Half, }, { .speed = SPEED_100, .duplex = DUPLEX_FULL, .setting = SUPPORTED_100baseT_Full, }, { .speed = SPEED_100, .duplex = DUPLEX_HALF, .setting = SUPPORTED_100baseT_Half, }, { .speed = SPEED_10, .duplex = DUPLEX_FULL, .setting = SUPPORTED_10baseT_Full, }, { .speed = SPEED_10, .duplex = DUPLEX_HALF, .setting = SUPPORTED_10baseT_Half, },}; #define MAX_NUM_SETTINGS ARRAY_SIZE(settings) /** * phy_find_setting - find a PHY settings array entry that matches speed & duplex * @speed: speed to match * @duplex: duplex to match * * Description: Searches the settings array for the setting which * matches the desired speed and duplex, and returns the index * of that setting. Returns the index of the last setting if * none of the others match. */static inline int phy_find_setting(int speed, int duplex){ int idx = 0; while (idx < ARRAY_SIZE(settings) && (settings[idx].speed != speed || settings[idx].duplex != duplex)) idx++; return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;} /** * phy_find_valid - find a PHY setting that matches the requested features mask * @idx: The first index in settings[] to search * @features: A mask of the valid settings * * Description: Returns the index of the first valid setting less * than or equal to the one pointed to by idx, as determined by * the mask in features. Returns the index of the last setting * if nothing else matches. */static inline int phy_find_valid(int idx, u32 features){ while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features)) idx++; return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;} /** * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex * @phydev: the target phy_device struct * * Description: Make sure the PHY is set to supported speeds and * duplexes. Drop down by one in this order: 1000/FULL, * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. */static void phy_sanitize_settings(struct phy_device *phydev){ u32 features = phydev->supported; int idx; /* Sanitize settings based on PHY capabilities */ if ((features & SUPPORTED_Autoneg) == 0) phydev->autoneg = AUTONEG_DISABLE; idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex), features); phydev->speed = settings[idx].speed; phydev->duplex = settings[idx].duplex;} /** * phy_ethtool_sset - generic ethtool sset function, handles all the details * @phydev: target phy_device struct * @cmd: ethtool_cmd * * A few notes about parameter checking: * - We don't set port or transceiver, so we don't care what they * were set to. * - phy_start_aneg() will make sure forced settings are sane, and * choose the next best ones from the ones selected, so we don't * care if ethtool tries to give us bad values. */int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd){ u32 speed = ethtool_cmd_speed(cmd); if (cmd->phy_address != phydev->addr) return -EINVAL; /* We make sure that we don't pass unsupported * values in to the PHY */ cmd->advertising &= phydev->supported; /* Verify the settings we care about. */ if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) return -EINVAL; if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) return -EINVAL; if (cmd->autoneg == AUTONEG_DISABLE && ((speed != SPEED_1000 && speed != SPEED_100 && speed != SPEED_10) || (cmd->duplex != DUPLEX_HALF && cmd->duplex != DUPLEX_FULL))) return -EINVAL; phydev->autoneg = cmd->autoneg; phydev->speed = speed; phydev->advertising = cmd->advertising; if (AUTONEG_ENABLE == cmd->autoneg) phydev->advertising |= ADVERTISED_Autoneg; else phydev->advertising &= ~ADVERTISED_Autoneg; phydev->duplex = cmd->duplex; /* Restart the PHY */ phy_start_aneg(phydev); return 0;}EXPORT_SYMBOL(phy_ethtool_sset); int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd){ cmd->supported = phydev->supported; cmd->advertising = phydev->advertising; ethtool_cmd_speed_set(cmd, phydev->speed); cmd->duplex = phydev->duplex; cmd->port = PORT_MII; cmd->phy_address = phydev->addr; cmd->transceiver = phy_is_internal(phydev) ? XCVR_INTERNAL : XCVR_EXTERNAL; cmd->autoneg = phydev->autoneg; return 0;}EXPORT_SYMBOL(phy_ethtool_gset); /** * phy_mii_ioctl - generic PHY MII ioctl interface * @phydev: the phy_device struct * @ifr: &struct ifreq for socket ioctl's * @cmd: ioctl cmd to execute * * Note that this function is currently incompatible with the * PHYCONTROL layer. It changes registers without regard to * current state. Use at own risk. */int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd){ struct mii_ioctl_data *mii_data = if_mii(ifr); u16 val = mii_data->val_in; switch (cmd) { case SIOCGMIIPHY: mii_data->phy_id = phydev->addr; /* fall through */ case SIOCGMIIREG: mii_data->val_out = mdiobus_read(phydev->bus, mii_data->phy_id, mii_data->reg_num); break; case SIOCSMIIREG: if (mii_data->phy_id == phydev->addr) { switch(mii_data->reg_num) { case MII_BMCR: if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0) phydev->autoneg = AUTONEG_DISABLE; else phydev->autoneg = AUTONEG_ENABLE; if ((!phydev->autoneg) && (val & BMCR_FULLDPLX)) phydev->duplex = DUPLEX_FULL; else phydev->duplex = DUPLEX_HALF; if ((!phydev->autoneg) && (val & BMCR_SPEED1000)) phydev->speed = SPEED_1000; else if ((!phydev->autoneg) && (val & BMCR_SPEED100)) phydev->speed = SPEED_100; break; case MII_ADVERTISE: phydev->advertising = val; break; default: /* do nothing */ break; } } mdiobus_write(phydev->bus, mii_data->phy_id, mii_data->reg_num, val); if (mii_data->reg_num == MII_BMCR && val & BMCR_RESET && phydev->drv->config_init) { phy_scan_fixups(phydev); phydev->drv->config_init(phydev); } break; case SIOCSHWTSTAMP: if (phydev->drv->hwtstamp) return phydev->drv->hwtstamp(phydev, ifr); /* fall through */ default: return -EOPNOTSUPP; } return 0;}EXPORT_SYMBOL(phy_mii_ioctl); /** * phy_start_aneg - start auto-negotiation for this PHY device * @phydev: the phy_device struct * * Description: Sanitizes the settings (if we're not autonegotiating * them), and then calls the driver's config_aneg function. * If the PHYCONTROL Layer is operating, we change the state to * reflect the beginning of Auto-negotiation or forcing. */int phy_start_aneg(struct phy_device *phydev){ int err; mutex_lock(&phydev->lock); if (AUTONEG_DISABLE == phydev->autoneg) phy_sanitize_settings(phydev); err = phydev->drv->config_aneg(phydev); if (err < 0) goto out_unlock; if (phydev->state != PHY_HALTED) { if (AUTONEG_ENABLE == phydev->autoneg) { phydev->state = PHY_AN; phydev->link_timeout = PHY_AN_TIMEOUT; } else { phydev->state = PHY_FORCING; phydev->link_timeout = PHY_FORCE_TIMEOUT; } } out_unlock: mutex_unlock(&phydev->lock); return err;}EXPORT_SYMBOL(phy_start_aneg); /** * phy_start_machine - start PHY state machine tracking * @phydev: the phy_device struct * @handler: callback function for state change notifications * * Description: The PHY infrastructure can run a state machine * which tracks whether the PHY is starting up, negotiating, * etc. This function starts the timer which tracks the state * of the PHY. If you want to be notified when the state changes, * pass in the callback @handler, otherwise, pass NULL. If you * want to maintain your own state machine, do not call this * function. */void phy_start_machine(struct phy_device *phydev, void (*handler)(struct net_device *)){ phydev->adjust_state = handler; queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ);} /** * phy_stop_machine - stop the PHY state machine tracking * @phydev: target phy_device struct * * Description: Stops the state machine timer, sets the state to UP * (unless it wasn't up yet). This function must be called BEFORE * phy_detach. */void phy_stop_machine(struct phy_device *phydev){ cancel_delayed_work_sync(&phydev->state_queue); mutex_lock(&phydev->lock); if (phydev->state > PHY_UP) phydev->state = PHY_UP; mutex_unlock(&phydev->lock); phydev->adjust_state = NULL;} /** * phy_error - enter HALTED state for this PHY device * @phydev: target phy_device struct * * Moves the PHY to the HALTED state in response to a read * or write error, and tells the controller the link is down. * Must not be called from interrupt context, or while the * phydev->lock is held. */static void phy_error(struct phy_device *phydev){ mutex_lock(&phydev->lock); phydev->state = PHY_HALTED; mutex_unlock(&phydev->lock);} /** * phy_interrupt - PHY interrupt handler * @irq: interrupt line * @phy_dat: phy_device pointer * * Description: When a PHY interrupt occurs, the handler disables * interrupts, and schedules a work task to clear the interrupt. */static irqreturn_t phy_interrupt(int irq, void *phy_dat){ struct phy_device *phydev = phy_dat; if (PHY_HALTED == phydev->state) return IRQ_NONE; /* It can't be ours. */ /* The MDIO bus is not allowed to be written in interrupt * context, so we need to disable the irq here. A work * queue will write the PHY to disable and clear the * interrupt, and then reenable the irq line. */ disable_irq_nosync(irq); atomic_inc(&phydev->irq_disable);Lines 1–500 of 1163. Load more
/* * drivers/net/phy/phy.c * * Framework for configuring and reading PHY devices * Based on code in sungem_phy.c and gianfar_phy.c * * Author: Andy Fleming * * Copyright (c) 2004 Freescale Semiconductor, Inc. * Copyright (c) 2006, 2007 Maciej W. Rozycki * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/unistd.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/skbuff.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/mii.h> #include <linux/ethtool.h> #include <linux/phy.h> #include <linux/timer.h> #include <linux/workqueue.h> #include <linux/mdio.h> #include <linux/atomic.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/uaccess.h> /** * phy_print_status - Convenience function to print out the current phy status * @phydev: the phy_device struct */ void phy_print_status(struct phy_device *phydev) { if (phydev->link) pr_info("%s - Link is Up - %d/%s\n", dev_name(&phydev->dev), phydev->speed, DUPLEX_FULL == phydev->duplex ? "Full" : "Half"); else pr_info("%s - Link is Down\n", dev_name(&phydev->dev)); } EXPORT_SYMBOL(phy_print_status); /** * phy_clear_interrupt - Ack the phy device's interrupt * @phydev: the phy_device struct * * If the @phydev driver has an ack_interrupt function, call it to * ack and clear the phy device's interrupt. * * Returns 0 on success on < 0 on error. */ static int phy_clear_interrupt(struct phy_device *phydev) { int err = 0; if (phydev->drv->ack_interrupt) err = phydev->drv->ack_interrupt(phydev); return err; } /** * phy_config_interrupt - configure the PHY device for the requested interrupts * @phydev: the phy_device struct * @interrupts: interrupt flags to configure for this @phydev * * Returns 0 on success on < 0 on error. */ static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts) { int err = 0; phydev->interrupts = interrupts; if (phydev->drv->config_intr) err = phydev->drv->config_intr(phydev); return err; } /** * phy_aneg_done - return auto-negotiation status * @phydev: target phy_device struct * * Description: Reads the status register and returns 0 either if * auto-negotiation is incomplete, or if there was an error. * Returns BMSR_ANEGCOMPLETE if auto-negotiation is done. */ static inline int phy_aneg_done(struct phy_device *phydev) { int retval; retval = phy_read(phydev, MII_BMSR); return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE); } /* A structure for mapping a particular speed and duplex * combination to a particular SUPPORTED and ADVERTISED value */ struct phy_setting { int speed; int duplex; u32 setting; }; /* A mapping of all SUPPORTED settings to speed/duplex */ static const struct phy_setting settings[] = { { .speed = 10000, .duplex = DUPLEX_FULL, .setting = SUPPORTED_10000baseT_Full, }, { .speed = SPEED_1000, .duplex = DUPLEX_FULL, .setting = SUPPORTED_1000baseT_Full, }, { .speed = SPEED_1000, .duplex = DUPLEX_HALF, .setting = SUPPORTED_1000baseT_Half, }, { .speed = SPEED_100, .duplex = DUPLEX_FULL, .setting = SUPPORTED_100baseT_Full, }, { .speed = SPEED_100, .duplex = DUPLEX_HALF, .setting = SUPPORTED_100baseT_Half, }, { .speed = SPEED_10, .duplex = DUPLEX_FULL, .setting = SUPPORTED_10baseT_Full, }, { .speed = SPEED_10, .duplex = DUPLEX_HALF, .setting = SUPPORTED_10baseT_Half, }, }; #define MAX_NUM_SETTINGS ARRAY_SIZE(settings) /** * phy_find_setting - find a PHY settings array entry that matches speed & duplex * @speed: speed to match * @duplex: duplex to match * * Description: Searches the settings array for the setting which * matches the desired speed and duplex, and returns the index * of that setting. Returns the index of the last setting if * none of the others match. */ static inline int phy_find_setting(int speed, int duplex) { int idx = 0; while (idx < ARRAY_SIZE(settings) && (settings[idx].speed != speed || settings[idx].duplex != duplex)) idx++; return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; } /** * phy_find_valid - find a PHY setting that matches the requested features mask * @idx: The first index in settings[] to search * @features: A mask of the valid settings * * Description: Returns the index of the first valid setting less * than or equal to the one pointed to by idx, as determined by * the mask in features. Returns the index of the last setting * if nothing else matches. */ static inline int phy_find_valid(int idx, u32 features) { while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features)) idx++; return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1; } /** * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex * @phydev: the target phy_device struct * * Description: Make sure the PHY is set to supported speeds and * duplexes. Drop down by one in this order: 1000/FULL, * 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF. */ static void phy_sanitize_settings(struct phy_device *phydev) { u32 features = phydev->supported; int idx; /* Sanitize settings based on PHY capabilities */ if ((features & SUPPORTED_Autoneg) == 0) phydev->autoneg = AUTONEG_DISABLE; idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex), features); phydev->speed = settings[idx].speed; phydev->duplex = settings[idx].duplex; } /** * phy_ethtool_sset - generic ethtool sset function, handles all the details * @phydev: target phy_device struct * @cmd: ethtool_cmd * * A few notes about parameter checking: * - We don't set port or transceiver, so we don't care what they * were set to. * - phy_start_aneg() will make sure forced settings are sane, and * choose the next best ones from the ones selected, so we don't * care if ethtool tries to give us bad values. */ int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd) { u32 speed = ethtool_cmd_speed(cmd); if (cmd->phy_address != phydev->addr) return -EINVAL; /* We make sure that we don't pass unsupported * values in to the PHY */ cmd->advertising &= phydev->supported; /* Verify the settings we care about. */ if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE) return -EINVAL; if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0) return -EINVAL; if (cmd->autoneg == AUTONEG_DISABLE && ((speed != SPEED_1000 && speed != SPEED_100 && speed != SPEED_10) || (cmd->duplex != DUPLEX_HALF && cmd->duplex != DUPLEX_FULL))) return -EINVAL; phydev->autoneg = cmd->autoneg; phydev->speed = speed; phydev->advertising = cmd->advertising; if (AUTONEG_ENABLE == cmd->autoneg) phydev->advertising |= ADVERTISED_Autoneg; else phydev->advertising &= ~ADVERTISED_Autoneg; phydev->duplex = cmd->duplex; /* Restart the PHY */ phy_start_aneg(phydev); return 0; } EXPORT_SYMBOL(phy_ethtool_sset); int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd) { cmd->supported = phydev->supported; cmd->advertising = phydev->advertising; ethtool_cmd_speed_set(cmd, phydev->speed); cmd->duplex = phydev->duplex; cmd->port = PORT_MII; cmd->phy_address = phydev->addr; cmd->transceiver = phy_is_internal(phydev) ? XCVR_INTERNAL : XCVR_EXTERNAL; cmd->autoneg = phydev->autoneg; return 0; } EXPORT_SYMBOL(phy_ethtool_gset); /** * phy_mii_ioctl - generic PHY MII ioctl interface * @phydev: the phy_device struct * @ifr: &struct ifreq for socket ioctl's * @cmd: ioctl cmd to execute * * Note that this function is currently incompatible with the * PHYCONTROL layer. It changes registers without regard to * current state. Use at own risk. */ int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd) { struct mii_ioctl_data *mii_data = if_mii(ifr); u16 val = mii_data->val_in; switch (cmd) { case SIOCGMIIPHY: mii_data->phy_id = phydev->addr; /* fall through */ case SIOCGMIIREG: mii_data->val_out = mdiobus_read(phydev->bus, mii_data->phy_id, mii_data->reg_num); break; case SIOCSMIIREG: if (mii_data->phy_id == phydev->addr) { switch(mii_data->reg_num) { case MII_BMCR: if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0) phydev->autoneg = AUTONEG_DISABLE; else phydev->autoneg = AUTONEG_ENABLE; if ((!phydev->autoneg) && (val & BMCR_FULLDPLX)) phydev->duplex = DUPLEX_FULL; else phydev->duplex = DUPLEX_HALF; if ((!phydev->autoneg) && (val & BMCR_SPEED1000)) phydev->speed = SPEED_1000; else if ((!phydev->autoneg) && (val & BMCR_SPEED100)) phydev->speed = SPEED_100; break; case MII_ADVERTISE: phydev->advertising = val; break; default: /* do nothing */ break; } } mdiobus_write(phydev->bus, mii_data->phy_id, mii_data->reg_num, val); if (mii_data->reg_num == MII_BMCR && val & BMCR_RESET && phydev->drv->config_init) { phy_scan_fixups(phydev); phydev->drv->config_init(phydev); } break; case SIOCSHWTSTAMP: if (phydev->drv->hwtstamp) return phydev->drv->hwtstamp(phydev, ifr); /* fall through */ default: return -EOPNOTSUPP; } return 0; } EXPORT_SYMBOL(phy_mii_ioctl); /** * phy_start_aneg - start auto-negotiation for this PHY device * @phydev: the phy_device struct * * Description: Sanitizes the settings (if we're not autonegotiating * them), and then calls the driver's config_aneg function. * If the PHYCONTROL Layer is operating, we change the state to * reflect the beginning of Auto-negotiation or forcing. */ int phy_start_aneg(struct phy_device *phydev) { int err; mutex_lock(&phydev->lock); if (AUTONEG_DISABLE == phydev->autoneg) phy_sanitize_settings(phydev); err = phydev->drv->config_aneg(phydev); if (err < 0) goto out_unlock; if (phydev->state != PHY_HALTED) { if (AUTONEG_ENABLE == phydev->autoneg) { phydev->state = PHY_AN; phydev->link_timeout = PHY_AN_TIMEOUT; } else { phydev->state = PHY_FORCING; phydev->link_timeout = PHY_FORCE_TIMEOUT; } } out_unlock: mutex_unlock(&phydev->lock); return err; } EXPORT_SYMBOL(phy_start_aneg); /** * phy_start_machine - start PHY state machine tracking * @phydev: the phy_device struct * @handler: callback function for state change notifications * * Description: The PHY infrastructure can run a state machine * which tracks whether the PHY is starting up, negotiating, * etc. This function starts the timer which tracks the state * of the PHY. If you want to be notified when the state changes, * pass in the callback @handler, otherwise, pass NULL. If you * want to maintain your own state machine, do not call this * function. */ void phy_start_machine(struct phy_device *phydev, void (*handler)(struct net_device *)) { phydev->adjust_state = handler; queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ); } /** * phy_stop_machine - stop the PHY state machine tracking * @phydev: target phy_device struct * * Description: Stops the state machine timer, sets the state to UP * (unless it wasn't up yet). This function must be called BEFORE * phy_detach. */ void phy_stop_machine(struct phy_device *phydev) { cancel_delayed_work_sync(&phydev->state_queue); mutex_lock(&phydev->lock); if (phydev->state > PHY_UP) phydev->state = PHY_UP; mutex_unlock(&phydev->lock); phydev->adjust_state = NULL; } /** * phy_error - enter HALTED state for this PHY device * @phydev: target phy_device struct * * Moves the PHY to the HALTED state in response to a read * or write error, and tells the controller the link is down. * Must not be called from interrupt context, or while the * phydev->lock is held. */ static void phy_error(struct phy_device *phydev) { mutex_lock(&phydev->lock); phydev->state = PHY_HALTED; mutex_unlock(&phydev->lock); } /** * phy_interrupt - PHY interrupt handler * @irq: interrupt line * @phy_dat: phy_device pointer * * Description: When a PHY interrupt occurs, the handler disables * interrupts, and schedules a work task to clear the interrupt. */ static irqreturn_t phy_interrupt(int irq, void *phy_dat) { struct phy_device *phydev = phy_dat; if (PHY_HALTED == phydev->state) return IRQ_NONE; /* It can't be ours. */ /* The MDIO bus is not allowed to be written in interrupt * context, so we need to disable the irq here. A work * queue will write the PHY to disable and clear the * interrupt, and then reenable the irq line. */ disable_irq_nosync(irq); atomic_inc(&phydev->irq_disable);