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linux/linux-5.4.31/drivers/net/phy/phy.c

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// SPDX-License-Identifier: GPL-2.0+
/* 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
*/
#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>
#define PHY_STATE_TIME HZ
#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(READY)
PHY_STATE_STR(UP)
PHY_STATE_STR(RUNNING)
PHY_STATE_STR(NOLINK)
PHY_STATE_STR(HALTED)
}
return NULL;
}
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);
}
static const char *phy_pause_str(struct phy_device *phydev)
{
bool local_pause, local_asym_pause;
if (phydev->autoneg == AUTONEG_DISABLE)
goto no_pause;
local_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->advertising);
local_asym_pause = linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->advertising);
if (local_pause && phydev->pause)
return "rx/tx";
if (local_asym_pause && phydev->asym_pause) {
if (local_pause)
return "rx";
if (phydev->pause)
return "tx";
}
no_pause:
return "off";
}
/**
* 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),
phy_pause_str(phydev));
} 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, bool interrupts)
{
phydev->interrupts = interrupts ? 1 : 0;
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);
else if (phydev->is_c45)
return genphy_c45_aneg_done(phydev);
else
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, unsigned long *supported)
{
return phy_lookup_setting(speed, duplex, supported, 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)
{
return phy_speeds(speeds, size, phy->supported);
}
/**
* 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,
unsigned long *features)
{
return !!phy_lookup_setting(speed, duplex, features, 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;
setting = phy_find_valid(phydev->speed, phydev->duplex,
phydev->supported);
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)
{
__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
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 */
ethtool_convert_legacy_u32_to_link_mode(advertising, cmd->advertising);
linkmode_and(advertising, 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;
linkmode_copy(phydev->advertising, advertising);
linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->advertising, AUTONEG_ENABLE == cmd->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)
{
__ETHTOOL_DECLARE_LINK_MODE_MASK(advertising);
u8 autoneg = cmd->base.autoneg;
u8 duplex = cmd->base.duplex;
u32 speed = cmd->base.speed;
if (cmd->base.phy_address != phydev->mdio.addr)
return -EINVAL;
linkmode_copy(advertising, cmd->link_modes.advertising);
/* We make sure that we don't pass unsupported values in to the PHY */
linkmode_and(advertising, advertising, phydev->supported);
/* Verify the settings we care about. */
if (autoneg != AUTONEG_ENABLE && autoneg != AUTONEG_DISABLE)
return -EINVAL;
if (autoneg == AUTONEG_ENABLE && linkmode_empty(advertising))
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;
phydev->speed = speed;
linkmode_copy(phydev->advertising, advertising);
linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->advertising, autoneg == AUTONEG_ENABLE);
phydev->duplex = duplex;
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)
{
linkmode_copy(cmd->link_modes.supported, phydev->supported);
linkmode_copy(cmd->link_modes.advertising, phydev->advertising);
linkmode_copy(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;
int prtad, devad;
switch (cmd) {
case SIOCGMIIPHY:
mii_data->phy_id = phydev->mdio.addr;
/* fall through */
case SIOCGMIIREG:
if (mdio_phy_id_is_c45(mii_data->phy_id)) {
prtad = mdio_phy_id_prtad(mii_data->phy_id);
devad = mdio_phy_id_devad(mii_data->phy_id);
devad = MII_ADDR_C45 | devad << 16 | mii_data->reg_num;
} else {
prtad = mii_data->phy_id;
devad = mii_data->reg_num;
}
mii_data->val_out = mdiobus_read(phydev->mdio.bus, prtad,
devad);
return 0;
case SIOCSMIIREG:
if (mdio_phy_id_is_c45(mii_data->phy_id)) {
prtad = mdio_phy_id_prtad(mii_data->phy_id);
devad = mdio_phy_id_devad(mii_data->phy_id);
devad = MII_ADDR_C45 | devad << 16 | mii_data->reg_num;
} else {
prtad = mii_data->phy_id;
devad = mii_data->reg_num;
}
if (prtad == phydev->mdio.addr) {
switch (devad) {
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:
mii_adv_mod_linkmode_adv_t(phydev->advertising,
val);
change_autoneg = true;
break;
case MII_CTRL1000:
mii_ctrl1000_mod_linkmode_adv_t(phydev->advertising,
val);
change_autoneg = true;
break;
default:
/* do nothing */
break;
}
}
mdiobus_write(phydev->mdio.bus, prtad, devad, val);
if (prtad == phydev->mdio.addr &&
devad == 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);
void phy_queue_state_machine(struct phy_device *phydev, unsigned long jiffies)
{
mod_delayed_work(system_power_efficient_wq, &phydev->state_queue,
jiffies);
}
EXPORT_SYMBOL(phy_queue_state_machine);
static void phy_trigger_machine(struct phy_device *phydev)
{
phy_queue_state_machine(phydev, 0);
}
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 genphy_c45_config_aneg(phydev);
return genphy_config_aneg(phydev);
}
/**
* phy_check_link_status - check link status and set state accordingly
* @phydev: the phy_device struct
*
* Description: Check for link and whether autoneg was triggered / is running
* and set state accordingly
*/
static int phy_check_link_status(struct phy_device *phydev)
{
int err;
WARN_ON(!mutex_is_locked(&phydev->lock));
/* Keep previous state if loopback is enabled because some PHYs
* report that Link is Down when loopback is enabled.
*/
if (phydev->loopback_enabled)
return 0;
err = phy_read_status(phydev);
if (err)
return err;
if (phydev->link && phydev->state != PHY_RUNNING) {
phydev->state = PHY_RUNNING;
phy_link_up(phydev);
} else if (!phydev->link && phydev->state != PHY_NOLINK) {
phydev->state = PHY_NOLINK;
phy_link_down(phydev, true);
}
return 0;
}
/**
* 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;
if (!phydev->drv)
return -EIO;
mutex_lock(&phydev->lock);
if (AUTONEG_DISABLE == phydev->autoneg)
phy_sanitize_settings(phydev);
err = phy_config_aneg(phydev);
if (err < 0)
goto out_unlock;
if (phy_is_started(phydev))
err = phy_check_link_status(phydev);
out_unlock:
mutex_unlock(&phydev->lock);
return err;
}
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)
{
__ETHTOOL_DECLARE_LINK_MODE_MASK(adv_tmp);
int ret;
if (phydev->autoneg != AUTONEG_ENABLE)
return 0;
linkmode_copy(adv_tmp, phydev->advertising);
ret = phy_speed_down_core(phydev);
if (ret)
return ret;
linkmode_copy(phydev->adv_old, adv_tmp);
if (linkmode_equal(phydev->advertising, adv_tmp))
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)
{
__ETHTOOL_DECLARE_LINK_MODE_MASK(adv_tmp);
if (phydev->autoneg != AUTONEG_ENABLE)
return 0;
if (linkmode_empty(phydev->adv_old))
return 0;
linkmode_copy(adv_tmp, phydev->advertising);
linkmode_copy(phydev->advertising, phydev->adv_old);
linkmode_zero(phydev->adv_old);
if (linkmode_equal(phydev->advertising, adv_tmp))
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)
{
phy_trigger_machine(phydev);
}
EXPORT_SYMBOL_GPL(phy_start_machine);
/**
* 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 (phy_is_started(phydev))
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)
{
WARN_ON(1);
mutex_lock(&phydev->lock);
phydev->state = PHY_HALTED;
mutex_unlock(&phydev->lock);
phy_trigger_machine(phydev);
}
/**
* 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_interrupt - PHY interrupt handler
* @irq: interrupt line
* @phy_dat: phy_device pointer
*
* Description: Handle PHY interrupt
*/
static irqreturn_t phy_interrupt(int irq, void *phy_dat)
{
struct phy_device *phydev = phy_dat;
if (phydev->drv->did_interrupt && !phydev->drv->did_interrupt(phydev))
return IRQ_NONE;
if (phydev->drv->handle_interrupt) {
if (phydev->drv->handle_interrupt(phydev))
goto phy_err;
} else {
/* reschedule state queue work to run as soon as possible */
phy_trigger_machine(phydev);
}
/* did_interrupt() may have cleared the interrupt already */
if (!phydev->drv->did_interrupt && phy_clear_interrupt(phydev))
goto phy_err;
return IRQ_HANDLED;
phy_err:
phy_error(phydev);
return IRQ_NONE;
}
/**
* 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_request_interrupt - request and enable interrupt for a PHY device
* @phydev: target phy_device struct
*
* Description: Request and enable the interrupt for the given PHY.
* If this fails, then we set irq to PHY_POLL.
* This should only be called with a valid IRQ number.
*/
void phy_request_interrupt(struct phy_device *phydev)
{
int err;
err = request_threaded_irq(phydev->irq, NULL, phy_interrupt,
IRQF_ONESHOT | IRQF_SHARED,
phydev_name(phydev), phydev);
if (err) {
phydev_warn(phydev, "Error %d requesting IRQ %d, falling back to polling\n",
err, phydev->irq);
phydev->irq = PHY_POLL;
} else {
if (phy_enable_interrupts(phydev)) {
phydev_warn(phydev, "Can't enable interrupt, falling back to polling\n");
phy_free_interrupt(phydev);
phydev->irq = PHY_POLL;
}
}
}
EXPORT_SYMBOL(phy_request_interrupt);
/**
* phy_free_interrupt - disable and free interrupt for a PHY device
* @phydev: target phy_device struct
*
* Description: Disable and free the interrupt for the given PHY.
* This should only be called with a valid IRQ number.
*/
void phy_free_interrupt(struct phy_device *phydev)
{
phy_disable_interrupts(phydev);
free_irq(phydev->irq, phydev);
}
EXPORT_SYMBOL(phy_free_interrupt);
/**
* phy_stop - Bring down the PHY link, and stop checking the status
* @phydev: target phy_device struct
*/
void phy_stop(struct phy_device *phydev)
{
if (!phy_is_started(phydev)) {
WARN(1, "called from state %s\n",
phy_state_to_str(phydev->state));
return;
}
mutex_lock(&phydev->lock);
phydev->state = PHY_HALTED;
mutex_unlock(&phydev->lock);
phy_state_machine(&phydev->state_queue.work);
phy_stop_machine(phydev);
/* Cannot call flush_scheduled_work() here as desired because
* of rtnl_lock(), but PHY_HALTED shall guarantee irq handler
* 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)
{
mutex_lock(&phydev->lock);
if (phydev->state != PHY_READY && phydev->state != PHY_HALTED) {
WARN(1, "called from state %s\n",
phy_state_to_str(phydev->state));
goto out;
}
/* if phy was suspended, bring the physical link up again */
__phy_resume(phydev);
phydev->state = PHY_UP;
phy_start_machine(phydev);
out:
mutex_unlock(&phydev->lock);
}
EXPORT_SYMBOL(phy_start);
/**
* 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;
mutex_lock(&phydev->lock);
old_state = phydev->state;
switch (phydev->state) {
case PHY_DOWN:
case PHY_READY:
break;
case PHY_UP:
needs_aneg = true;
break;
case PHY_NOLINK:
case PHY_RUNNING:
err = phy_check_link_status(phydev);
break;
case PHY_HALTED:
if (phydev->link) {
phydev->link = 0;
phy_link_down(phydev, true);
}
do_suspend = true;
break;
}
mutex_unlock(&phydev->lock);
if (needs_aneg)
err = phy_start_aneg(phydev);
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));
if (phydev->drv && phydev->drv->link_change_notify)
phydev->drv->link_change_notify(phydev);
}
/* 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().
*
* In state PHY_HALTED the PHY gets suspended, so rescheduling the
* state machine would be pointless and possibly error prone when
* called from phy_disconnect() synchronously.
*/
mutex_lock(&phydev->lock);
if (phy_polling_mode(phydev) && phy_is_started(phydev))
phy_queue_state_machine(phydev, PHY_STATE_TIME);
mutex_unlock(&phydev->lock);
}
/**
* 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 */
phy_trigger_machine(phydev);
}
EXPORT_SYMBOL(phy_mac_interrupt);
static void mmd_eee_adv_to_linkmode(unsigned long *advertising, u16 eee_adv)
{
linkmode_zero(advertising);
if (eee_adv & MDIO_EEE_100TX)
linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
advertising);
if (eee_adv & MDIO_EEE_1000T)
linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
advertising);
if (eee_adv & MDIO_EEE_10GT)
linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
advertising);
if (eee_adv & MDIO_EEE_1000KX)
linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
advertising);
if (eee_adv & MDIO_EEE_10GKX4)
linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
advertising);
if (eee_adv & MDIO_EEE_10GKR)
linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
advertising);
}
/**
* 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) {
__ETHTOOL_DECLARE_LINK_MODE_MASK(common);
__ETHTOOL_DECLARE_LINK_MODE_MASK(lp);
__ETHTOOL_DECLARE_LINK_MODE_MASK(adv);
int eee_lp, eee_cap, eee_adv;
int status;
u32 cap;
/* 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;
mmd_eee_adv_to_linkmode(adv, eee_adv);
mmd_eee_adv_to_linkmode(lp, eee_lp);
linkmode_and(common, adv, lp);
if (!phy_check_valid(phydev->speed, phydev->duplex, common))
goto eee_exit_err;
if (clk_stop_enable)
/* Configure the PHY to stop receiving xMII
* clock while it is signaling LPI.
*/
phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
MDIO_PCS_CTRL1_CLKSTOP_EN);
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);
data->eee_enabled = !!data->advertised;
/* 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);
data->eee_active = !!(data->advertised & data->lp_advertised);
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 = 0, 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;
if (data->eee_enabled) {
adv = !data->advertised ? cap :
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.
*/
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);
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