diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/phy/phy.c | 1371 |
1 files changed, 1371 insertions, 0 deletions
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c new file mode 100644 index 000000000..dd4bf4265 --- /dev/null +++ b/drivers/net/phy/phy.c @@ -0,0 +1,1371 @@ +/* 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/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/phy_led_triggers.h> +#include <linux/workqueue.h> +#include <linux/mdio.h> +#include <linux/io.h> +#include <linux/uaccess.h> +#include <linux/atomic.h> + +#include <asm/irq.h> + +#define PHY_STATE_STR(_state) \ + case PHY_##_state: \ + return __stringify(_state); \ + +static const char *phy_state_to_str(enum phy_state st) +{ + switch (st) { + PHY_STATE_STR(DOWN) + PHY_STATE_STR(STARTING) + PHY_STATE_STR(READY) + PHY_STATE_STR(PENDING) + PHY_STATE_STR(UP) + PHY_STATE_STR(AN) + PHY_STATE_STR(RUNNING) + PHY_STATE_STR(NOLINK) + PHY_STATE_STR(FORCING) + PHY_STATE_STR(CHANGELINK) + PHY_STATE_STR(HALTED) + PHY_STATE_STR(RESUMING) + } + + return NULL; +} + + +/** + * 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) { + netdev_info(phydev->attached_dev, + "Link is Up - %s/%s - flow control %s\n", + phy_speed_to_str(phydev->speed), + phy_duplex_to_str(phydev->duplex), + phydev->pause ? "rx/tx" : "off"); + } else { + netdev_info(phydev->attached_dev, "Link is Down\n"); + } +} +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 or < 0 on error. + */ +static int phy_clear_interrupt(struct phy_device *phydev) +{ + if (phydev->drv->ack_interrupt) + return phydev->drv->ack_interrupt(phydev); + + return 0; +} + +/** + * 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 or < 0 on error. + */ +static int phy_config_interrupt(struct phy_device *phydev, u32 interrupts) +{ + phydev->interrupts = interrupts; + if (phydev->drv->config_intr) + return phydev->drv->config_intr(phydev); + + return 0; +} + +/** + * phy_restart_aneg - restart auto-negotiation + * @phydev: target phy_device struct + * + * Restart the autonegotiation on @phydev. Returns >= 0 on success or + * negative errno on error. + */ +int phy_restart_aneg(struct phy_device *phydev) +{ + int ret; + + if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0))) + ret = genphy_c45_restart_aneg(phydev); + else + ret = genphy_restart_aneg(phydev); + + return ret; +} +EXPORT_SYMBOL_GPL(phy_restart_aneg); + +/** + * phy_aneg_done - return auto-negotiation status + * @phydev: target phy_device struct + * + * Description: Return the auto-negotiation status from this @phydev + * Returns > 0 on success or < 0 on error. 0 means that auto-negotiation + * is still pending. + */ +int phy_aneg_done(struct phy_device *phydev) +{ + if (phydev->drv && phydev->drv->aneg_done) + return phydev->drv->aneg_done(phydev); + + /* Avoid genphy_aneg_done() if the Clause 45 PHY does not + * implement Clause 22 registers + */ + if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0))) + return -EINVAL; + + return genphy_aneg_done(phydev); +} +EXPORT_SYMBOL(phy_aneg_done); + +/** + * phy_find_valid - find a PHY setting that matches the requested parameters + * @speed: desired speed + * @duplex: desired duplex + * @supported: mask of supported link modes + * + * Locate a supported phy setting that is, in priority order: + * - an exact match for the specified speed and duplex mode + * - a match for the specified speed, or slower speed + * - the slowest supported speed + * Returns the matched phy_setting entry, or %NULL if no supported phy + * settings were found. + */ +static const struct phy_setting * +phy_find_valid(int speed, int duplex, u32 supported) +{ + unsigned long mask = supported; + + return phy_lookup_setting(speed, duplex, &mask, BITS_PER_LONG, false); +} + +/** + * phy_supported_speeds - return all speeds currently supported by a phy device + * @phy: The phy device to return supported speeds of. + * @speeds: buffer to store supported speeds in. + * @size: size of speeds buffer. + * + * Description: Returns the number of supported speeds, and fills the speeds + * buffer with the supported speeds. If speeds buffer is too small to contain + * all currently supported speeds, will return as many speeds as can fit. + */ +unsigned int phy_supported_speeds(struct phy_device *phy, + unsigned int *speeds, + unsigned int size) +{ + unsigned long supported = phy->supported; + + return phy_speeds(speeds, size, &supported, BITS_PER_LONG); +} + +/** + * phy_check_valid - check if there is a valid PHY setting which matches + * speed, duplex, and feature mask + * @speed: speed to match + * @duplex: duplex to match + * @features: A mask of the valid settings + * + * Description: Returns true if there is a valid setting, false otherwise. + */ +static inline bool phy_check_valid(int speed, int duplex, u32 features) +{ + unsigned long mask = features; + + return !!phy_lookup_setting(speed, duplex, &mask, BITS_PER_LONG, true); +} + +/** + * 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) +{ + const struct phy_setting *setting; + u32 features = phydev->supported; + + /* Sanitize settings based on PHY capabilities */ + if ((features & SUPPORTED_Autoneg) == 0) + phydev->autoneg = AUTONEG_DISABLE; + + setting = phy_find_valid(phydev->speed, phydev->duplex, features); + if (setting) { + phydev->speed = setting->speed; + phydev->duplex = setting->duplex; + } else { + /* We failed to find anything (no supported speeds?) */ + phydev->speed = SPEED_UNKNOWN; + phydev->duplex = DUPLEX_UNKNOWN; + } +} + +/** + * 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->mdio.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; + + phydev->mdix_ctrl = cmd->eth_tp_mdix_ctrl; + + /* Restart the PHY */ + phy_start_aneg(phydev); + + return 0; +} +EXPORT_SYMBOL(phy_ethtool_sset); + +int phy_ethtool_ksettings_set(struct phy_device *phydev, + const struct ethtool_link_ksettings *cmd) +{ + u8 autoneg = cmd->base.autoneg; + u8 duplex = cmd->base.duplex; + u32 speed = cmd->base.speed; + u32 advertising; + + if (cmd->base.phy_address != phydev->mdio.addr) + return -EINVAL; + + ethtool_convert_link_mode_to_legacy_u32(&advertising, + cmd->link_modes.advertising); + + /* We make sure that we don't pass unsupported values in to the PHY */ + advertising &= phydev->supported; + + /* Verify the settings we care about. */ + if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE) + return -EINVAL; + + if (autoneg == AUTONEG_ENABLE && advertising == 0) + return -EINVAL; + + if (autoneg == AUTONEG_DISABLE && + ((speed != SPEED_1000 && + speed != SPEED_100 && + speed != SPEED_10) || + (duplex != DUPLEX_HALF && + duplex != DUPLEX_FULL))) + return -EINVAL; + + phydev->autoneg = autoneg; + + if (autoneg == AUTONEG_DISABLE) { + phydev->speed = speed; + phydev->duplex = duplex; + } + + phydev->advertising = advertising; + + if (autoneg == AUTONEG_ENABLE) + phydev->advertising |= ADVERTISED_Autoneg; + else + phydev->advertising &= ~ADVERTISED_Autoneg; + + phydev->mdix_ctrl = cmd->base.eth_tp_mdix_ctrl; + + /* Restart the PHY */ + phy_start_aneg(phydev); + + return 0; +} +EXPORT_SYMBOL(phy_ethtool_ksettings_set); + +void phy_ethtool_ksettings_get(struct phy_device *phydev, + struct ethtool_link_ksettings *cmd) +{ + ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported, + phydev->supported); + + ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising, + phydev->advertising); + + ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.lp_advertising, + phydev->lp_advertising); + + cmd->base.speed = phydev->speed; + cmd->base.duplex = phydev->duplex; + if (phydev->interface == PHY_INTERFACE_MODE_MOCA) + cmd->base.port = PORT_BNC; + else + cmd->base.port = PORT_MII; + cmd->base.transceiver = phy_is_internal(phydev) ? + XCVR_INTERNAL : XCVR_EXTERNAL; + cmd->base.phy_address = phydev->mdio.addr; + cmd->base.autoneg = phydev->autoneg; + cmd->base.eth_tp_mdix_ctrl = phydev->mdix_ctrl; + cmd->base.eth_tp_mdix = phydev->mdix; +} +EXPORT_SYMBOL(phy_ethtool_ksettings_get); + +/** + * 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; + bool change_autoneg = false; + + switch (cmd) { + case SIOCGMIIPHY: + mii_data->phy_id = phydev->mdio.addr; + /* fall through */ + + case SIOCGMIIREG: + mii_data->val_out = mdiobus_read(phydev->mdio.bus, + mii_data->phy_id, + mii_data->reg_num); + return 0; + + case SIOCSMIIREG: + if (mii_data->phy_id == phydev->mdio.addr) { + switch (mii_data->reg_num) { + case MII_BMCR: + if ((val & (BMCR_RESET | BMCR_ANENABLE)) == 0) { + if (phydev->autoneg == AUTONEG_ENABLE) + change_autoneg = true; + phydev->autoneg = AUTONEG_DISABLE; + if (val & BMCR_FULLDPLX) + phydev->duplex = DUPLEX_FULL; + else + phydev->duplex = DUPLEX_HALF; + if (val & BMCR_SPEED1000) + phydev->speed = SPEED_1000; + else if (val & BMCR_SPEED100) + phydev->speed = SPEED_100; + else phydev->speed = SPEED_10; + } + else { + if (phydev->autoneg == AUTONEG_DISABLE) + change_autoneg = true; + phydev->autoneg = AUTONEG_ENABLE; + } + break; + case MII_ADVERTISE: + phydev->advertising = mii_adv_to_ethtool_adv_t(val); + change_autoneg = true; + break; + default: + /* do nothing */ + break; + } + } + + mdiobus_write(phydev->mdio.bus, mii_data->phy_id, + mii_data->reg_num, val); + + if (mii_data->phy_id == phydev->mdio.addr && + mii_data->reg_num == MII_BMCR && + val & BMCR_RESET) + return phy_init_hw(phydev); + + if (change_autoneg) + return phy_start_aneg(phydev); + + return 0; + + case SIOCSHWTSTAMP: + if (phydev->drv && phydev->drv->hwtstamp) + return phydev->drv->hwtstamp(phydev, ifr); + /* fall through */ + + default: + return -EOPNOTSUPP; + } +} +EXPORT_SYMBOL(phy_mii_ioctl); + +static int phy_config_aneg(struct phy_device *phydev) +{ + if (phydev->drv->config_aneg) + return phydev->drv->config_aneg(phydev); + + /* Clause 45 PHYs that don't implement Clause 22 registers are not + * allowed to call genphy_config_aneg() + */ + if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0))) + return -EOPNOTSUPP; + + return genphy_config_aneg(phydev); +} + +/** + * phy_start_aneg_priv - start auto-negotiation for this PHY device + * @phydev: the phy_device struct + * @sync: indicate whether we should wait for the workqueue cancelation + * + * 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. + */ +static int phy_start_aneg_priv(struct phy_device *phydev, bool sync) +{ + bool trigger = 0; + int err; + + if (!phydev->drv) + return -EIO; + + mutex_lock(&phydev->lock); + + if (AUTONEG_DISABLE == phydev->autoneg) + phy_sanitize_settings(phydev); + + /* Invalidate LP advertising flags */ + phydev->lp_advertising = 0; + + err = phy_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; + } + } + + /* Re-schedule a PHY state machine to check PHY status because + * negotiation may already be done and aneg interrupt may not be + * generated. + */ + if (!phy_polling_mode(phydev) && phydev->state == PHY_AN) { + err = phy_aneg_done(phydev); + if (err > 0) { + trigger = true; + err = 0; + } + } + +out_unlock: + mutex_unlock(&phydev->lock); + + if (trigger) + phy_trigger_machine(phydev, sync); + + return err; +} + +/** + * 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) +{ + return phy_start_aneg_priv(phydev, true); +} +EXPORT_SYMBOL(phy_start_aneg); + +static int phy_poll_aneg_done(struct phy_device *phydev) +{ + unsigned int retries = 100; + int ret; + + do { + msleep(100); + ret = phy_aneg_done(phydev); + } while (!ret && --retries); + + if (!ret) + return -ETIMEDOUT; + + return ret < 0 ? ret : 0; +} + +/** + * phy_speed_down - set speed to lowest speed supported by both link partners + * @phydev: the phy_device struct + * @sync: perform action synchronously + * + * Description: Typically used to save energy when waiting for a WoL packet + * + * WARNING: Setting sync to false may cause the system being unable to suspend + * in case the PHY generates an interrupt when finishing the autonegotiation. + * This interrupt may wake up the system immediately after suspend. + * Therefore use sync = false only if you're sure it's safe with the respective + * network chip. + */ +int phy_speed_down(struct phy_device *phydev, bool sync) +{ + u32 adv = phydev->lp_advertising & phydev->supported; + u32 adv_old = phydev->advertising; + int ret; + + if (phydev->autoneg != AUTONEG_ENABLE) + return 0; + + if (adv & PHY_10BT_FEATURES) + phydev->advertising &= ~(PHY_100BT_FEATURES | + PHY_1000BT_FEATURES); + else if (adv & PHY_100BT_FEATURES) + phydev->advertising &= ~PHY_1000BT_FEATURES; + + if (phydev->advertising == adv_old) + return 0; + + ret = phy_config_aneg(phydev); + if (ret) + return ret; + + return sync ? phy_poll_aneg_done(phydev) : 0; +} +EXPORT_SYMBOL_GPL(phy_speed_down); + +/** + * phy_speed_up - (re)set advertised speeds to all supported speeds + * @phydev: the phy_device struct + * + * Description: Used to revert the effect of phy_speed_down + */ +int phy_speed_up(struct phy_device *phydev) +{ + u32 mask = PHY_10BT_FEATURES | PHY_100BT_FEATURES | PHY_1000BT_FEATURES; + u32 adv_old = phydev->advertising; + + if (phydev->autoneg != AUTONEG_ENABLE) + return 0; + + phydev->advertising = (adv_old & ~mask) | (phydev->supported & mask); + + if (phydev->advertising == adv_old) + return 0; + + return phy_config_aneg(phydev); +} +EXPORT_SYMBOL_GPL(phy_speed_up); + +/** + * phy_start_machine - start PHY state machine tracking + * @phydev: the phy_device struct + * + * Description: The PHY infrastructure can run a state machine + * which tracks whether the PHY is starting up, negotiating, + * etc. This function starts the delayed workqueue which tracks + * the state of the PHY. If you want to maintain your own state machine, + * do not call this function. + */ +void phy_start_machine(struct phy_device *phydev) +{ + queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, HZ); +} +EXPORT_SYMBOL_GPL(phy_start_machine); + +/** + * phy_trigger_machine - trigger the state machine to run + * + * @phydev: the phy_device struct + * @sync: indicate whether we should wait for the workqueue cancelation + * + * Description: There has been a change in state which requires that the + * state machine runs. + */ + +void phy_trigger_machine(struct phy_device *phydev, bool sync) +{ + if (sync) + cancel_delayed_work_sync(&phydev->state_queue); + else + cancel_delayed_work(&phydev->state_queue); + queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, 0); +} + +/** + * phy_stop_machine - stop the PHY state machine tracking + * @phydev: target phy_device struct + * + * Description: Stops the state machine delayed workqueue, 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_HALTED) + phydev->state = PHY_UP; + mutex_unlock(&phydev->lock); +} + +/** + * 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_trigger_machine(phydev, false); +} + +/** + * phy_disable_interrupts - Disable the PHY interrupts from the PHY side + * @phydev: target phy_device struct + */ +static int phy_disable_interrupts(struct phy_device *phydev) +{ + int err; + + /* Disable PHY interrupts */ + err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED); + if (err) + return err; + + /* Clear the interrupt */ + return phy_clear_interrupt(phydev); +} + +/** + * phy_change - Called by the phy_interrupt to handle PHY changes + * @phydev: phy_device struct that interrupted + */ +static irqreturn_t phy_change(struct phy_device *phydev) +{ + if (phy_interrupt_is_valid(phydev)) { + if (phydev->drv->did_interrupt && + !phydev->drv->did_interrupt(phydev)) + return IRQ_NONE; + + if (phydev->state == PHY_HALTED) + if (phy_disable_interrupts(phydev)) + goto phy_err; + } + + mutex_lock(&phydev->lock); + if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state)) + phydev->state = PHY_CHANGELINK; + mutex_unlock(&phydev->lock); + + /* reschedule state queue work to run as soon as possible */ + phy_trigger_machine(phydev, true); + + if (phy_interrupt_is_valid(phydev) && phy_clear_interrupt(phydev)) + goto phy_err; + return IRQ_HANDLED; + +phy_err: + phy_error(phydev); + return IRQ_NONE; +} + +/** + * phy_change_work - Scheduled by the phy_mac_interrupt to handle PHY changes + * @work: work_struct that describes the work to be done + */ +void phy_change_work(struct work_struct *work) +{ + struct phy_device *phydev = + container_of(work, struct phy_device, phy_queue); + + phy_change(phydev); +} + +/** + * phy_interrupt - PHY interrupt handler + * @irq: interrupt line + * @phy_dat: phy_device pointer + * + * Description: When a PHY interrupt occurs, the handler disables + * interrupts, and uses phy_change to handle 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. */ + + return phy_change(phydev); +} + +/** + * phy_enable_interrupts - Enable the interrupts from the PHY side + * @phydev: target phy_device struct + */ +static int phy_enable_interrupts(struct phy_device *phydev) +{ + int err = phy_clear_interrupt(phydev); + + if (err < 0) + return err; + + return phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED); +} + +/** + * phy_start_interrupts - request and enable interrupts for a PHY device + * @phydev: target phy_device struct + * + * Description: Request the interrupt for the given PHY. + * If this fails, then we set irq to PHY_POLL. + * Otherwise, we enable the interrupts in the PHY. + * This should only be called with a valid IRQ number. + * Returns 0 on success or < 0 on error. + */ +int phy_start_interrupts(struct phy_device *phydev) +{ + if (request_threaded_irq(phydev->irq, NULL, phy_interrupt, + IRQF_ONESHOT | IRQF_SHARED, + phydev_name(phydev), phydev) < 0) { + pr_warn("%s: Can't get IRQ %d (PHY)\n", + phydev->mdio.bus->name, phydev->irq); + phydev->irq = PHY_POLL; + return 0; + } + + return phy_enable_interrupts(phydev); +} +EXPORT_SYMBOL(phy_start_interrupts); + +/** + * phy_stop_interrupts - disable interrupts from a PHY device + * @phydev: target phy_device struct + */ +int phy_stop_interrupts(struct phy_device *phydev) +{ + int err = phy_disable_interrupts(phydev); + + if (err) + phy_error(phydev); + + free_irq(phydev->irq, phydev); + + return err; +} +EXPORT_SYMBOL(phy_stop_interrupts); + +/** + * phy_stop - Bring down the PHY link, and stop checking the status + * @phydev: target phy_device struct + */ +void phy_stop(struct phy_device *phydev) +{ + mutex_lock(&phydev->lock); + + if (PHY_HALTED == phydev->state) + goto out_unlock; + + if (phy_interrupt_is_valid(phydev)) + phy_disable_interrupts(phydev); + + phydev->state = PHY_HALTED; + +out_unlock: + mutex_unlock(&phydev->lock); + + /* Cannot call flush_scheduled_work() here as desired because + * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change() + * will not reenable interrupts. + */ +} +EXPORT_SYMBOL(phy_stop); + +/** + * phy_start - start or restart a PHY device + * @phydev: target phy_device struct + * + * Description: Indicates the attached device's readiness to + * handle PHY-related work. Used during startup to start the + * PHY, and after a call to phy_stop() to resume operation. + * Also used to indicate the MDIO bus has cleared an error + * condition. + */ +void phy_start(struct phy_device *phydev) +{ + int err = 0; + + mutex_lock(&phydev->lock); + + switch (phydev->state) { + case PHY_STARTING: + phydev->state = PHY_PENDING; + break; + case PHY_READY: + phydev->state = PHY_UP; + break; + case PHY_HALTED: + /* if phy was suspended, bring the physical link up again */ + __phy_resume(phydev); + + /* make sure interrupts are re-enabled for the PHY */ + if (phy_interrupt_is_valid(phydev)) { + err = phy_enable_interrupts(phydev); + if (err < 0) + break; + } + + phydev->state = PHY_RESUMING; + break; + default: + break; + } + mutex_unlock(&phydev->lock); + + phy_trigger_machine(phydev, true); +} +EXPORT_SYMBOL(phy_start); + +static void phy_link_up(struct phy_device *phydev) +{ + phydev->phy_link_change(phydev, true, true); + phy_led_trigger_change_speed(phydev); +} + +static void phy_link_down(struct phy_device *phydev, bool do_carrier) +{ + phydev->phy_link_change(phydev, false, do_carrier); + phy_led_trigger_change_speed(phydev); +} + +/** + * phy_state_machine - Handle the state machine + * @work: work_struct that describes the work to be done + */ +void phy_state_machine(struct work_struct *work) +{ + struct delayed_work *dwork = to_delayed_work(work); + struct phy_device *phydev = + container_of(dwork, struct phy_device, state_queue); + bool needs_aneg = false, do_suspend = false; + enum phy_state old_state; + int err = 0; + int old_link; + + mutex_lock(&phydev->lock); + + old_state = phydev->state; + + if (phydev->drv && phydev->drv->link_change_notify) + phydev->drv->link_change_notify(phydev); + + switch (phydev->state) { + case PHY_DOWN: + case PHY_STARTING: + case PHY_READY: + case PHY_PENDING: + break; + case PHY_UP: + needs_aneg = true; + + phydev->link_timeout = PHY_AN_TIMEOUT; + + break; + case PHY_AN: + err = phy_read_status(phydev); + if (err < 0) + break; + + /* If the link is down, give up on negotiation for now */ + if (!phydev->link) { + phydev->state = PHY_NOLINK; + phy_link_down(phydev, true); + break; + } + + /* Check if negotiation is done. Break if there's an error */ + err = phy_aneg_done(phydev); + if (err < 0) + break; + + /* If AN is done, we're running */ + if (err > 0) { + phydev->state = PHY_RUNNING; + phy_link_up(phydev); + } else if (0 == phydev->link_timeout--) + needs_aneg = true; + break; + case PHY_NOLINK: + if (!phy_polling_mode(phydev)) + break; + + err = phy_read_status(phydev); + if (err) + break; + + if (phydev->link) { + if (AUTONEG_ENABLE == phydev->autoneg) { + err = phy_aneg_done(phydev); + if (err < 0) + break; + + if (!err) { + phydev->state = PHY_AN; + phydev->link_timeout = PHY_AN_TIMEOUT; + break; + } + } + phydev->state = PHY_RUNNING; + phy_link_up(phydev); + } + break; + case PHY_FORCING: + err = genphy_update_link(phydev); + if (err) + break; + + if (phydev->link) { + phydev->state = PHY_RUNNING; + phy_link_up(phydev); + } else { + if (0 == phydev->link_timeout--) + needs_aneg = true; + phy_link_down(phydev, false); + } + break; + case PHY_RUNNING: + /* Only register a CHANGE if we are polling and link changed + * since latest checking. + */ + if (phy_polling_mode(phydev)) { + old_link = phydev->link; + err = phy_read_status(phydev); + if (err) + break; + + if (old_link != phydev->link) + phydev->state = PHY_CHANGELINK; + } + /* + * Failsafe: check that nobody set phydev->link=0 between two + * poll cycles, otherwise we won't leave RUNNING state as long + * as link remains down. + */ + if (!phydev->link && phydev->state == PHY_RUNNING) { + phydev->state = PHY_CHANGELINK; + phydev_err(phydev, "no link in PHY_RUNNING\n"); + } + break; + case PHY_CHANGELINK: + err = phy_read_status(phydev); + if (err) + break; + + if (phydev->link) { + phydev->state = PHY_RUNNING; + phy_link_up(phydev); + } else { + phydev->state = PHY_NOLINK; + phy_link_down(phydev, true); + } + break; + case PHY_HALTED: + if (phydev->link) { + phydev->link = 0; + phy_link_down(phydev, true); + do_suspend = true; + } + break; + case PHY_RESUMING: + if (AUTONEG_ENABLE == phydev->autoneg) { + err = phy_aneg_done(phydev); + if (err < 0) + break; + + /* err > 0 if AN is done. + * Otherwise, it's 0, and we're still waiting for AN + */ + if (err > 0) { + err = phy_read_status(phydev); + if (err) + break; + + if (phydev->link) { + phydev->state = PHY_RUNNING; + phy_link_up(phydev); + } else { + phydev->state = PHY_NOLINK; + phy_link_down(phydev, false); + } + } else { + phydev->state = PHY_AN; + phydev->link_timeout = PHY_AN_TIMEOUT; + } + } else { + err = phy_read_status(phydev); + if (err) + break; + + if (phydev->link) { + phydev->state = PHY_RUNNING; + phy_link_up(phydev); + } else { + phydev->state = PHY_NOLINK; + phy_link_down(phydev, false); + } + } + break; + } + + mutex_unlock(&phydev->lock); + + if (needs_aneg) + err = phy_start_aneg_priv(phydev, false); + else if (do_suspend) + phy_suspend(phydev); + + if (err < 0) + phy_error(phydev); + + if (old_state != phydev->state) + phydev_dbg(phydev, "PHY state change %s -> %s\n", + phy_state_to_str(old_state), + phy_state_to_str(phydev->state)); + + /* Only re-schedule a PHY state machine change if we are polling the + * PHY, if PHY_IGNORE_INTERRUPT is set, then we will be moving + * between states from phy_mac_interrupt() + */ + if (phy_polling_mode(phydev)) + queue_delayed_work(system_power_efficient_wq, &phydev->state_queue, + PHY_STATE_TIME * HZ); +} + +/** + * phy_mac_interrupt - MAC says the link has changed + * @phydev: phy_device struct with changed link + * + * The MAC layer is able to indicate there has been a change in the PHY link + * status. Trigger the state machine and work a work queue. + */ +void phy_mac_interrupt(struct phy_device *phydev) +{ + /* Trigger a state machine change */ + queue_work(system_power_efficient_wq, &phydev->phy_queue); +} +EXPORT_SYMBOL(phy_mac_interrupt); + +/** + * phy_init_eee - init and check the EEE feature + * @phydev: target phy_device struct + * @clk_stop_enable: PHY may stop the clock during LPI + * + * Description: it checks if the Energy-Efficient Ethernet (EEE) + * is supported by looking at the MMD registers 3.20 and 7.60/61 + * and it programs the MMD register 3.0 setting the "Clock stop enable" + * bit if required. + */ +int phy_init_eee(struct phy_device *phydev, bool clk_stop_enable) +{ + if (!phydev->drv) + return -EIO; + + /* According to 802.3az,the EEE is supported only in full duplex-mode. + */ + if (phydev->duplex == DUPLEX_FULL) { + int eee_lp, eee_cap, eee_adv; + u32 lp, cap, adv; + int status; + + /* Read phy status to properly get the right settings */ + status = phy_read_status(phydev); + if (status) + return status; + + /* First check if the EEE ability is supported */ + eee_cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE); + if (eee_cap <= 0) + goto eee_exit_err; + + cap = mmd_eee_cap_to_ethtool_sup_t(eee_cap); + if (!cap) + goto eee_exit_err; + + /* Check which link settings negotiated and verify it in + * the EEE advertising registers. + */ + eee_lp = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE); + if (eee_lp <= 0) + goto eee_exit_err; + + eee_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV); + if (eee_adv <= 0) + goto eee_exit_err; + + adv = mmd_eee_adv_to_ethtool_adv_t(eee_adv); + lp = mmd_eee_adv_to_ethtool_adv_t(eee_lp); + if (!phy_check_valid(phydev->speed, phydev->duplex, lp & adv)) + goto eee_exit_err; + + if (clk_stop_enable) { + /* Configure the PHY to stop receiving xMII + * clock while it is signaling LPI. + */ + int val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1); + if (val < 0) + return val; + + val |= MDIO_PCS_CTRL1_CLKSTOP_EN; + phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1, val); + } + + return 0; /* EEE supported */ + } +eee_exit_err: + return -EPROTONOSUPPORT; +} +EXPORT_SYMBOL(phy_init_eee); + +/** + * phy_get_eee_err - report the EEE wake error count + * @phydev: target phy_device struct + * + * Description: it is to report the number of time where the PHY + * failed to complete its normal wake sequence. + */ +int phy_get_eee_err(struct phy_device *phydev) +{ + if (!phydev->drv) + return -EIO; + + return phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_WK_ERR); +} +EXPORT_SYMBOL(phy_get_eee_err); + +/** + * phy_ethtool_get_eee - get EEE supported and status + * @phydev: target phy_device struct + * @data: ethtool_eee data + * + * Description: it reportes the Supported/Advertisement/LP Advertisement + * capabilities. + */ +int phy_ethtool_get_eee(struct phy_device *phydev, struct ethtool_eee *data) +{ + int val; + + if (!phydev->drv) + return -EIO; + + /* Get Supported EEE */ + val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE); + if (val < 0) + return val; + data->supported = mmd_eee_cap_to_ethtool_sup_t(val); + + /* Get advertisement EEE */ + val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV); + if (val < 0) + return val; + data->advertised = mmd_eee_adv_to_ethtool_adv_t(val); + + /* Get LP advertisement EEE */ + val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_LPABLE); + if (val < 0) + return val; + data->lp_advertised = mmd_eee_adv_to_ethtool_adv_t(val); + + return 0; +} +EXPORT_SYMBOL(phy_ethtool_get_eee); + +/** + * phy_ethtool_set_eee - set EEE supported and status + * @phydev: target phy_device struct + * @data: ethtool_eee data + * + * Description: it is to program the Advertisement EEE register. + */ +int phy_ethtool_set_eee(struct phy_device *phydev, struct ethtool_eee *data) +{ + int cap, old_adv, adv, ret; + + if (!phydev->drv) + return -EIO; + + /* Get Supported EEE */ + cap = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_EEE_ABLE); + if (cap < 0) + return cap; + + old_adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV); + if (old_adv < 0) + return old_adv; + + adv = ethtool_adv_to_mmd_eee_adv_t(data->advertised) & cap; + + /* Mask prohibited EEE modes */ + adv &= ~phydev->eee_broken_modes; + + if (old_adv != adv) { + ret = phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv); + if (ret < 0) + return ret; + + /* Restart autonegotiation so the new modes get sent to the + * link partner. + */ + if (phydev->autoneg == AUTONEG_ENABLE) { + ret = phy_restart_aneg(phydev); + if (ret < 0) + return ret; + } + } + + return 0; +} +EXPORT_SYMBOL(phy_ethtool_set_eee); + +int phy_ethtool_set_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol) +{ + if (phydev->drv && phydev->drv->set_wol) + return phydev->drv->set_wol(phydev, wol); + + return -EOPNOTSUPP; +} +EXPORT_SYMBOL(phy_ethtool_set_wol); + +void phy_ethtool_get_wol(struct phy_device *phydev, struct ethtool_wolinfo *wol) +{ + if (phydev->drv && phydev->drv->get_wol) + phydev->drv->get_wol(phydev, wol); +} +EXPORT_SYMBOL(phy_ethtool_get_wol); + +int phy_ethtool_get_link_ksettings(struct net_device *ndev, + struct ethtool_link_ksettings *cmd) +{ + struct phy_device *phydev = ndev->phydev; + + if (!phydev) + return -ENODEV; + + phy_ethtool_ksettings_get(phydev, cmd); + + return 0; +} +EXPORT_SYMBOL(phy_ethtool_get_link_ksettings); + +int phy_ethtool_set_link_ksettings(struct net_device *ndev, + const struct ethtool_link_ksettings *cmd) +{ + struct phy_device *phydev = ndev->phydev; + + if (!phydev) + return -ENODEV; + + return phy_ethtool_ksettings_set(phydev, cmd); +} +EXPORT_SYMBOL(phy_ethtool_set_link_ksettings); + +int phy_ethtool_nway_reset(struct net_device *ndev) +{ + struct phy_device *phydev = ndev->phydev; + + if (!phydev) + return -ENODEV; + + if (!phydev->drv) + return -EIO; + + return phy_restart_aneg(phydev); +} +EXPORT_SYMBOL(phy_ethtool_nway_reset); |