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linux/drivers/net/phy/phy_device.c

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// SPDX-License-Identifier: GPL-2.0+
/* Framework for finding and configuring PHYs.
* Also contains generic PHY driver
*
* Author: Andy Fleming
*
* Copyright (c) 2004 Freescale Semiconductor, Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bitmap.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mdio.h>
#include <linux/mii.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/phy_led_triggers.h>
#include <linux/property.h>
#include <linux/sfp.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/unistd.h>
MODULE_DESCRIPTION("PHY library");
MODULE_AUTHOR("Andy Fleming");
MODULE_LICENSE("GPL");
__ETHTOOL_DECLARE_LINK_MODE_MASK(phy_basic_features) __ro_after_init;
EXPORT_SYMBOL_GPL(phy_basic_features);
__ETHTOOL_DECLARE_LINK_MODE_MASK(phy_basic_t1_features) __ro_after_init;
EXPORT_SYMBOL_GPL(phy_basic_t1_features);
__ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_features) __ro_after_init;
EXPORT_SYMBOL_GPL(phy_gbit_features);
__ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_fibre_features) __ro_after_init;
EXPORT_SYMBOL_GPL(phy_gbit_fibre_features);
__ETHTOOL_DECLARE_LINK_MODE_MASK(phy_gbit_all_ports_features) __ro_after_init;
EXPORT_SYMBOL_GPL(phy_gbit_all_ports_features);
__ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_features) __ro_after_init;
EXPORT_SYMBOL_GPL(phy_10gbit_features);
__ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_fec_features) __ro_after_init;
EXPORT_SYMBOL_GPL(phy_10gbit_fec_features);
const int phy_basic_ports_array[3] = {
ETHTOOL_LINK_MODE_Autoneg_BIT,
ETHTOOL_LINK_MODE_TP_BIT,
ETHTOOL_LINK_MODE_MII_BIT,
};
EXPORT_SYMBOL_GPL(phy_basic_ports_array);
const int phy_fibre_port_array[1] = {
ETHTOOL_LINK_MODE_FIBRE_BIT,
};
EXPORT_SYMBOL_GPL(phy_fibre_port_array);
const int phy_all_ports_features_array[7] = {
ETHTOOL_LINK_MODE_Autoneg_BIT,
ETHTOOL_LINK_MODE_TP_BIT,
ETHTOOL_LINK_MODE_MII_BIT,
ETHTOOL_LINK_MODE_FIBRE_BIT,
ETHTOOL_LINK_MODE_AUI_BIT,
ETHTOOL_LINK_MODE_BNC_BIT,
ETHTOOL_LINK_MODE_Backplane_BIT,
};
EXPORT_SYMBOL_GPL(phy_all_ports_features_array);
const int phy_10_100_features_array[4] = {
ETHTOOL_LINK_MODE_10baseT_Half_BIT,
ETHTOOL_LINK_MODE_10baseT_Full_BIT,
ETHTOOL_LINK_MODE_100baseT_Half_BIT,
ETHTOOL_LINK_MODE_100baseT_Full_BIT,
};
EXPORT_SYMBOL_GPL(phy_10_100_features_array);
const int phy_basic_t1_features_array[2] = {
ETHTOOL_LINK_MODE_TP_BIT,
ETHTOOL_LINK_MODE_100baseT1_Full_BIT,
};
EXPORT_SYMBOL_GPL(phy_basic_t1_features_array);
const int phy_gbit_features_array[2] = {
ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
};
EXPORT_SYMBOL_GPL(phy_gbit_features_array);
const int phy_10gbit_features_array[1] = {
ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
};
EXPORT_SYMBOL_GPL(phy_10gbit_features_array);
static const int phy_10gbit_fec_features_array[1] = {
ETHTOOL_LINK_MODE_10000baseR_FEC_BIT,
};
__ETHTOOL_DECLARE_LINK_MODE_MASK(phy_10gbit_full_features) __ro_after_init;
EXPORT_SYMBOL_GPL(phy_10gbit_full_features);
static const int phy_10gbit_full_features_array[] = {
ETHTOOL_LINK_MODE_10baseT_Full_BIT,
ETHTOOL_LINK_MODE_100baseT_Full_BIT,
ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
};
static void features_init(void)
{
/* 10/100 half/full*/
linkmode_set_bit_array(phy_basic_ports_array,
ARRAY_SIZE(phy_basic_ports_array),
phy_basic_features);
linkmode_set_bit_array(phy_10_100_features_array,
ARRAY_SIZE(phy_10_100_features_array),
phy_basic_features);
/* 100 full, TP */
linkmode_set_bit_array(phy_basic_t1_features_array,
ARRAY_SIZE(phy_basic_t1_features_array),
phy_basic_t1_features);
/* 10/100 half/full + 1000 half/full */
linkmode_set_bit_array(phy_basic_ports_array,
ARRAY_SIZE(phy_basic_ports_array),
phy_gbit_features);
linkmode_set_bit_array(phy_10_100_features_array,
ARRAY_SIZE(phy_10_100_features_array),
phy_gbit_features);
linkmode_set_bit_array(phy_gbit_features_array,
ARRAY_SIZE(phy_gbit_features_array),
phy_gbit_features);
/* 10/100 half/full + 1000 half/full + fibre*/
linkmode_set_bit_array(phy_basic_ports_array,
ARRAY_SIZE(phy_basic_ports_array),
phy_gbit_fibre_features);
linkmode_set_bit_array(phy_10_100_features_array,
ARRAY_SIZE(phy_10_100_features_array),
phy_gbit_fibre_features);
linkmode_set_bit_array(phy_gbit_features_array,
ARRAY_SIZE(phy_gbit_features_array),
phy_gbit_fibre_features);
linkmode_set_bit_array(phy_fibre_port_array,
ARRAY_SIZE(phy_fibre_port_array),
phy_gbit_fibre_features);
/* 10/100 half/full + 1000 half/full + TP/MII/FIBRE/AUI/BNC/Backplane*/
linkmode_set_bit_array(phy_all_ports_features_array,
ARRAY_SIZE(phy_all_ports_features_array),
phy_gbit_all_ports_features);
linkmode_set_bit_array(phy_10_100_features_array,
ARRAY_SIZE(phy_10_100_features_array),
phy_gbit_all_ports_features);
linkmode_set_bit_array(phy_gbit_features_array,
ARRAY_SIZE(phy_gbit_features_array),
phy_gbit_all_ports_features);
/* 10/100 half/full + 1000 half/full + 10G full*/
linkmode_set_bit_array(phy_all_ports_features_array,
ARRAY_SIZE(phy_all_ports_features_array),
phy_10gbit_features);
linkmode_set_bit_array(phy_10_100_features_array,
ARRAY_SIZE(phy_10_100_features_array),
phy_10gbit_features);
linkmode_set_bit_array(phy_gbit_features_array,
ARRAY_SIZE(phy_gbit_features_array),
phy_10gbit_features);
linkmode_set_bit_array(phy_10gbit_features_array,
ARRAY_SIZE(phy_10gbit_features_array),
phy_10gbit_features);
/* 10/100/1000/10G full */
linkmode_set_bit_array(phy_all_ports_features_array,
ARRAY_SIZE(phy_all_ports_features_array),
phy_10gbit_full_features);
linkmode_set_bit_array(phy_10gbit_full_features_array,
ARRAY_SIZE(phy_10gbit_full_features_array),
phy_10gbit_full_features);
/* 10G FEC only */
linkmode_set_bit_array(phy_10gbit_fec_features_array,
ARRAY_SIZE(phy_10gbit_fec_features_array),
phy_10gbit_fec_features);
}
void phy_device_free(struct phy_device *phydev)
{
put_device(&phydev->mdio.dev);
}
EXPORT_SYMBOL(phy_device_free);
static void phy_mdio_device_free(struct mdio_device *mdiodev)
{
struct phy_device *phydev;
phydev = container_of(mdiodev, struct phy_device, mdio);
phy_device_free(phydev);
}
static void phy_device_release(struct device *dev)
{
kfree(to_phy_device(dev));
}
static void phy_mdio_device_remove(struct mdio_device *mdiodev)
{
struct phy_device *phydev;
phydev = container_of(mdiodev, struct phy_device, mdio);
phy_device_remove(phydev);
}
static struct phy_driver genphy_driver;
static LIST_HEAD(phy_fixup_list);
static DEFINE_MUTEX(phy_fixup_lock);
#ifdef CONFIG_PM
static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
{
struct device_driver *drv = phydev->mdio.dev.driver;
struct phy_driver *phydrv = to_phy_driver(drv);
struct net_device *netdev = phydev->attached_dev;
if (!drv || !phydrv->suspend)
return false;
/* PHY not attached? May suspend if the PHY has not already been
* suspended as part of a prior call to phy_disconnect() ->
* phy_detach() -> phy_suspend() because the parent netdev might be the
* MDIO bus driver and clock gated at this point.
*/
if (!netdev)
goto out;
if (netdev->wol_enabled)
return false;
/* As long as not all affected network drivers support the
* wol_enabled flag, let's check for hints that WoL is enabled.
* Don't suspend PHY if the attached netdev parent may wake up.
* The parent may point to a PCI device, as in tg3 driver.
*/
if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
return false;
/* Also don't suspend PHY if the netdev itself may wakeup. This
* is the case for devices w/o underlaying pwr. mgmt. aware bus,
* e.g. SoC devices.
*/
if (device_may_wakeup(&netdev->dev))
return false;
out:
return !phydev->suspended;
}
static int mdio_bus_phy_suspend(struct device *dev)
{
struct phy_device *phydev = to_phy_device(dev);
/* We must stop the state machine manually, otherwise it stops out of
* control, possibly with the phydev->lock held. Upon resume, netdev
* may call phy routines that try to grab the same lock, and that may
* lead to a deadlock.
*/
if (phydev->attached_dev && phydev->adjust_link)
phy_stop_machine(phydev);
if (!mdio_bus_phy_may_suspend(phydev))
return 0;
phydev->suspended_by_mdio_bus = 1;
return phy_suspend(phydev);
}
static int mdio_bus_phy_resume(struct device *dev)
{
struct phy_device *phydev = to_phy_device(dev);
int ret;
if (!phydev->suspended_by_mdio_bus)
goto no_resume;
phydev->suspended_by_mdio_bus = 0;
ret = phy_resume(phydev);
if (ret < 0)
return ret;
no_resume:
if (phydev->attached_dev && phydev->adjust_link)
phy_start_machine(phydev);
return 0;
}
static int mdio_bus_phy_restore(struct device *dev)
{
struct phy_device *phydev = to_phy_device(dev);
struct net_device *netdev = phydev->attached_dev;
int ret;
if (!netdev)
return 0;
ret = phy_init_hw(phydev);
if (ret < 0)
return ret;
if (phydev->attached_dev && phydev->adjust_link)
phy_start_machine(phydev);
return 0;
}
static const struct dev_pm_ops mdio_bus_phy_pm_ops = {
.suspend = mdio_bus_phy_suspend,
.resume = mdio_bus_phy_resume,
.freeze = mdio_bus_phy_suspend,
.thaw = mdio_bus_phy_resume,
.restore = mdio_bus_phy_restore,
};
#define MDIO_BUS_PHY_PM_OPS (&mdio_bus_phy_pm_ops)
#else
#define MDIO_BUS_PHY_PM_OPS NULL
#endif /* CONFIG_PM */
/**
* phy_register_fixup - creates a new phy_fixup and adds it to the list
* @bus_id: A string which matches phydev->mdio.dev.bus_id (or PHY_ANY_ID)
* @phy_uid: Used to match against phydev->phy_id (the UID of the PHY)
* It can also be PHY_ANY_UID
* @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before
* comparison
* @run: The actual code to be run when a matching PHY is found
*/
int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
int (*run)(struct phy_device *))
{
struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL);
if (!fixup)
return -ENOMEM;
strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id));
fixup->phy_uid = phy_uid;
fixup->phy_uid_mask = phy_uid_mask;
fixup->run = run;
mutex_lock(&phy_fixup_lock);
list_add_tail(&fixup->list, &phy_fixup_list);
mutex_unlock(&phy_fixup_lock);
return 0;
}
EXPORT_SYMBOL(phy_register_fixup);
/* Registers a fixup to be run on any PHY with the UID in phy_uid */
int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
int (*run)(struct phy_device *))
{
return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run);
}
EXPORT_SYMBOL(phy_register_fixup_for_uid);
/* Registers a fixup to be run on the PHY with id string bus_id */
int phy_register_fixup_for_id(const char *bus_id,
int (*run)(struct phy_device *))
{
return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run);
}
EXPORT_SYMBOL(phy_register_fixup_for_id);
/**
* phy_unregister_fixup - remove a phy_fixup from the list
* @bus_id: A string matches fixup->bus_id (or PHY_ANY_ID) in phy_fixup_list
* @phy_uid: A phy id matches fixup->phy_id (or PHY_ANY_UID) in phy_fixup_list
* @phy_uid_mask: Applied to phy_uid and fixup->phy_uid before comparison
*/
int phy_unregister_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask)
{
struct list_head *pos, *n;
struct phy_fixup *fixup;
int ret;
ret = -ENODEV;
mutex_lock(&phy_fixup_lock);
list_for_each_safe(pos, n, &phy_fixup_list) {
fixup = list_entry(pos, struct phy_fixup, list);
if ((!strcmp(fixup->bus_id, bus_id)) &&
((fixup->phy_uid & phy_uid_mask) ==
(phy_uid & phy_uid_mask))) {
list_del(&fixup->list);
kfree(fixup);
ret = 0;
break;
}
}
mutex_unlock(&phy_fixup_lock);
return ret;
}
EXPORT_SYMBOL(phy_unregister_fixup);
/* Unregisters a fixup of any PHY with the UID in phy_uid */
int phy_unregister_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask)
{
return phy_unregister_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask);
}
EXPORT_SYMBOL(phy_unregister_fixup_for_uid);
/* Unregisters a fixup of the PHY with id string bus_id */
int phy_unregister_fixup_for_id(const char *bus_id)
{
return phy_unregister_fixup(bus_id, PHY_ANY_UID, 0xffffffff);
}
EXPORT_SYMBOL(phy_unregister_fixup_for_id);
/* Returns 1 if fixup matches phydev in bus_id and phy_uid.
* Fixups can be set to match any in one or more fields.
*/
static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup)
{
if (strcmp(fixup->bus_id, phydev_name(phydev)) != 0)
if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0)
return 0;
if ((fixup->phy_uid & fixup->phy_uid_mask) !=
(phydev->phy_id & fixup->phy_uid_mask))
if (fixup->phy_uid != PHY_ANY_UID)
return 0;
return 1;
}
/* Runs any matching fixups for this phydev */
static int phy_scan_fixups(struct phy_device *phydev)
{
struct phy_fixup *fixup;
mutex_lock(&phy_fixup_lock);
list_for_each_entry(fixup, &phy_fixup_list, list) {
if (phy_needs_fixup(phydev, fixup)) {
int err = fixup->run(phydev);
if (err < 0) {
mutex_unlock(&phy_fixup_lock);
return err;
}
phydev->has_fixups = true;
}
}
mutex_unlock(&phy_fixup_lock);
return 0;
}
static int phy_bus_match(struct device *dev, struct device_driver *drv)
{
struct phy_device *phydev = to_phy_device(dev);
struct phy_driver *phydrv = to_phy_driver(drv);
const int num_ids = ARRAY_SIZE(phydev->c45_ids.device_ids);
int i;
if (!(phydrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY))
return 0;
if (phydrv->match_phy_device)
return phydrv->match_phy_device(phydev);
if (phydev->is_c45) {
for (i = 1; i < num_ids; i++) {
if (phydev->c45_ids.device_ids[i] == 0xffffffff)
continue;
if ((phydrv->phy_id & phydrv->phy_id_mask) ==
(phydev->c45_ids.device_ids[i] &
phydrv->phy_id_mask))
return 1;
}
return 0;
} else {
return (phydrv->phy_id & phydrv->phy_id_mask) ==
(phydev->phy_id & phydrv->phy_id_mask);
}
}
static ssize_t
phy_id_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct phy_device *phydev = to_phy_device(dev);
return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id);
}
static DEVICE_ATTR_RO(phy_id);
static ssize_t
phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf)
{
struct phy_device *phydev = to_phy_device(dev);
const char *mode = NULL;
if (phy_is_internal(phydev))
mode = "internal";
else
mode = phy_modes(phydev->interface);
return sprintf(buf, "%s\n", mode);
}
static DEVICE_ATTR_RO(phy_interface);
static ssize_t
phy_has_fixups_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct phy_device *phydev = to_phy_device(dev);
return sprintf(buf, "%d\n", phydev->has_fixups);
}
static DEVICE_ATTR_RO(phy_has_fixups);
static struct attribute *phy_dev_attrs[] = {
&dev_attr_phy_id.attr,
&dev_attr_phy_interface.attr,
&dev_attr_phy_has_fixups.attr,
NULL,
};
ATTRIBUTE_GROUPS(phy_dev);
static const struct device_type mdio_bus_phy_type = {
.name = "PHY",
.groups = phy_dev_groups,
.release = phy_device_release,
.pm = MDIO_BUS_PHY_PM_OPS,
};
static int phy_request_driver_module(struct phy_device *dev, u32 phy_id)
{
int ret;
ret = request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT,
MDIO_ID_ARGS(phy_id));
/* We only check for failures in executing the usermode binary,
* not whether a PHY driver module exists for the PHY ID.
* Accept -ENOENT because this may occur in case no initramfs exists,
* then modprobe isn't available.
*/
if (IS_ENABLED(CONFIG_MODULES) && ret < 0 && ret != -ENOENT) {
phydev_err(dev, "error %d loading PHY driver module for ID 0x%08lx\n",
ret, (unsigned long)phy_id);
return ret;
}
return 0;
}
struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id,
bool is_c45,
struct phy_c45_device_ids *c45_ids)
{
struct phy_device *dev;
struct mdio_device *mdiodev;
int ret = 0;
/* We allocate the device, and initialize the default values */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return ERR_PTR(-ENOMEM);
mdiodev = &dev->mdio;
mdiodev->dev.parent = &bus->dev;
mdiodev->dev.bus = &mdio_bus_type;
mdiodev->dev.type = &mdio_bus_phy_type;
mdiodev->bus = bus;
mdiodev->bus_match = phy_bus_match;
mdiodev->addr = addr;
mdiodev->flags = MDIO_DEVICE_FLAG_PHY;
mdiodev->device_free = phy_mdio_device_free;
mdiodev->device_remove = phy_mdio_device_remove;
dev->speed = SPEED_UNKNOWN;
dev->duplex = DUPLEX_UNKNOWN;
dev->pause = 0;
dev->asym_pause = 0;
dev->link = 0;
dev->interface = PHY_INTERFACE_MODE_GMII;
dev->autoneg = AUTONEG_ENABLE;
dev->is_c45 = is_c45;
dev->phy_id = phy_id;
if (c45_ids)
dev->c45_ids = *c45_ids;
dev->irq = bus->irq[addr];
dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr);
device_initialize(&mdiodev->dev);
dev->state = PHY_DOWN;
mutex_init(&dev->lock);
INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
/* Request the appropriate module unconditionally; don't
* bother trying to do so only if it isn't already loaded,
* because that gets complicated. A hotplug event would have
* done an unconditional modprobe anyway.
* We don't do normal hotplug because it won't work for MDIO
* -- because it relies on the device staying around for long
* enough for the driver to get loaded. With MDIO, the NIC
* driver will get bored and give up as soon as it finds that
* there's no driver _already_ loaded.
*/
if (is_c45 && c45_ids) {
const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
int i;
for (i = 1; i < num_ids; i++) {
if (c45_ids->device_ids[i] == 0xffffffff)
continue;
ret = phy_request_driver_module(dev,
c45_ids->device_ids[i]);
if (ret)
break;
}
} else {
ret = phy_request_driver_module(dev, phy_id);
}
if (ret) {
put_device(&mdiodev->dev);
dev = ERR_PTR(ret);
}
return dev;
}
EXPORT_SYMBOL(phy_device_create);
/* phy_c45_probe_present - checks to see if a MMD is present in the package
* @bus: the target MII bus
* @prtad: PHY package address on the MII bus
* @devad: PHY device (MMD) address
*
* Read the MDIO_STAT2 register, and check whether a device is responding
* at this address.
*
* Returns: negative error number on bus access error, zero if no device
* is responding, or positive if a device is present.
*/
static int phy_c45_probe_present(struct mii_bus *bus, int prtad, int devad)
{
int stat2;
stat2 = mdiobus_c45_read(bus, prtad, devad, MDIO_STAT2);
if (stat2 < 0)
return stat2;
return (stat2 & MDIO_STAT2_DEVPRST) == MDIO_STAT2_DEVPRST_VAL;
}
/* get_phy_c45_devs_in_pkg - reads a MMD's devices in package registers.
* @bus: the target MII bus
* @addr: PHY address on the MII bus
* @dev_addr: MMD address in the PHY.
* @devices_in_package: where to store the devices in package information.
*
* Description: reads devices in package registers of a MMD at @dev_addr
* from PHY at @addr on @bus.
*
* Returns: 0 on success, -EIO on failure.
*/
static int get_phy_c45_devs_in_pkg(struct mii_bus *bus, int addr, int dev_addr,
u32 *devices_in_package)
{
int phy_reg;
phy_reg = mdiobus_c45_read(bus, addr, dev_addr, MDIO_DEVS2);
if (phy_reg < 0)
return -EIO;
*devices_in_package = phy_reg << 16;
phy_reg = mdiobus_c45_read(bus, addr, dev_addr, MDIO_DEVS1);
if (phy_reg < 0)
return -EIO;
*devices_in_package |= phy_reg;
return 0;
}
/**
* get_phy_c45_ids - reads the specified addr for its 802.3-c45 IDs.
* @bus: the target MII bus
* @addr: PHY address on the MII bus
* @c45_ids: where to store the c45 ID information.
*
* Read the PHY "devices in package". If this appears to be valid, read
* the PHY identifiers for each device. Return the "devices in package"
* and identifiers in @c45_ids.
*
* Returns zero on success, %-EIO on bus access error, or %-ENODEV if
* the "devices in package" is invalid.
*/
static int get_phy_c45_ids(struct mii_bus *bus, int addr,
struct phy_c45_device_ids *c45_ids)
{
const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
u32 devs_in_pkg = 0;
int i, ret, phy_reg;
/* Find first non-zero Devices In package. Device zero is reserved
* for 802.3 c45 complied PHYs, so don't probe it at first.
*/
for (i = 1; i < MDIO_MMD_NUM && (devs_in_pkg == 0 ||
(devs_in_pkg & 0x1fffffff) == 0x1fffffff); i++) {
if (i == MDIO_MMD_VEND1 || i == MDIO_MMD_VEND2) {
/* Check that there is a device present at this
* address before reading the devices-in-package
* register to avoid reading garbage from the PHY.
* Some PHYs (88x3310) vendor space is not IEEE802.3
* compliant.
*/
ret = phy_c45_probe_present(bus, addr, i);
if (ret < 0)
return -EIO;
if (!ret)
continue;
}
phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, &devs_in_pkg);
if (phy_reg < 0)
return -EIO;
}
if ((devs_in_pkg & 0x1fffffff) == 0x1fffffff) {
/* If mostly Fs, there is no device there, then let's probe
* MMD 0, as some 10G PHYs have zero Devices In package,
* e.g. Cortina CS4315/CS4340 PHY.
*/
phy_reg = get_phy_c45_devs_in_pkg(bus, addr, 0, &devs_in_pkg);
if (phy_reg < 0)
return -EIO;
/* no device there, let's get out of here */
if ((devs_in_pkg & 0x1fffffff) == 0x1fffffff)
return -ENODEV;
}
/* Now probe Device Identifiers for each device present. */
for (i = 1; i < num_ids; i++) {
if (!(devs_in_pkg & (1 << i)))
continue;
if (i == MDIO_MMD_VEND1 || i == MDIO_MMD_VEND2) {
/* Probe the "Device Present" bits for the vendor MMDs
* to ignore these if they do not contain IEEE 802.3
* registers.
*/
ret = phy_c45_probe_present(bus, addr, i);
if (ret < 0)
return ret;
if (!ret)
continue;
}
phy_reg = mdiobus_c45_read(bus, addr, i, MII_PHYSID1);
if (phy_reg < 0)
return -EIO;
c45_ids->device_ids[i] = phy_reg << 16;
phy_reg = mdiobus_c45_read(bus, addr, i, MII_PHYSID2);
if (phy_reg < 0)
return -EIO;
c45_ids->device_ids[i] |= phy_reg;
}
c45_ids->devices_in_package = devs_in_pkg;
/* Bit 0 doesn't represent a device, it indicates c22 regs presence */
c45_ids->mmds_present = devs_in_pkg & ~BIT(0);
return 0;
}
/**
* get_phy_c22_id - reads the specified addr for its clause 22 ID.
* @bus: the target MII bus
* @addr: PHY address on the MII bus
* @phy_id: where to store the ID retrieved.
*
* Read the 802.3 clause 22 PHY ID from the PHY at @addr on the @bus,
* placing it in @phy_id. Return zero on successful read and the ID is
* valid, %-EIO on bus access error, or %-ENODEV if no device responds
* or invalid ID.
*/
static int get_phy_c22_id(struct mii_bus *bus, int addr, u32 *phy_id)
{
int phy_reg;
/* Grab the bits from PHYIR1, and put them in the upper half */
phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
if (phy_reg < 0) {
/* returning -ENODEV doesn't stop bus scanning */
return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -EIO;
}
*phy_id = phy_reg << 16;
/* Grab the bits from PHYIR2, and put them in the lower half */
phy_reg = mdiobus_read(bus, addr, MII_PHYSID2);
if (phy_reg < 0) {
/* returning -ENODEV doesn't stop bus scanning */
return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -EIO;
}
*phy_id |= phy_reg;
/* If the phy_id is mostly Fs, there is no device there */
if ((*phy_id & 0x1fffffff) == 0x1fffffff)
return -ENODEV;
return 0;
}
/**
* get_phy_device - reads the specified PHY device and returns its @phy_device
* struct
* @bus: the target MII bus
* @addr: PHY address on the MII bus
* @is_c45: If true the PHY uses the 802.3 clause 45 protocol
*
* Probe for a PHY at @addr on @bus.
*
* When probing for a clause 22 PHY, then read the ID registers. If we find
* a valid ID, allocate and return a &struct phy_device.
*
* When probing for a clause 45 PHY, read the "devices in package" registers.
* If the "devices in package" appears valid, read the ID registers for each
* MMD, allocate and return a &struct phy_device.
*
* Returns an allocated &struct phy_device on success, %-ENODEV if there is
* no PHY present, or %-EIO on bus access error.
*/
struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
{
struct phy_c45_device_ids c45_ids;
u32 phy_id = 0;
int r;
c45_ids.devices_in_package = 0;
c45_ids.mmds_present = 0;
memset(c45_ids.device_ids, 0xff, sizeof(c45_ids.device_ids));
if (is_c45)
r = get_phy_c45_ids(bus, addr, &c45_ids);
else
r = get_phy_c22_id(bus, addr, &phy_id);
if (r)
return ERR_PTR(r);
return phy_device_create(bus, addr, phy_id, is_c45, &c45_ids);
}
EXPORT_SYMBOL(get_phy_device);
/**
* phy_device_register - Register the phy device on the MDIO bus
* @phydev: phy_device structure to be added to the MDIO bus
*/
int phy_device_register(struct phy_device *phydev)
{
int err;
err = mdiobus_register_device(&phydev->mdio);
if (err)
return err;
/* Deassert the reset signal */
phy_device_reset(phydev, 0);
/* Run all of the fixups for this PHY */
err = phy_scan_fixups(phydev);
if (err) {
phydev_err(phydev, "failed to initialize\n");
goto out;
}
err = device_add(&phydev->mdio.dev);
if (err) {
phydev_err(phydev, "failed to add\n");
goto out;
}
return 0;
out:
/* Assert the reset signal */
phy_device_reset(phydev, 1);
mdiobus_unregister_device(&phydev->mdio);
return err;
}
EXPORT_SYMBOL(phy_device_register);
/**
* phy_device_remove - Remove a previously registered phy device from the MDIO bus
* @phydev: phy_device structure to remove
*
* This doesn't free the phy_device itself, it merely reverses the effects
* of phy_device_register(). Use phy_device_free() to free the device
* after calling this function.
*/
void phy_device_remove(struct phy_device *phydev)
{
if (phydev->mii_ts)
unregister_mii_timestamper(phydev->mii_ts);
device_del(&phydev->mdio.dev);
/* Assert the reset signal */
phy_device_reset(phydev, 1);
mdiobus_unregister_device(&phydev->mdio);
}
EXPORT_SYMBOL(phy_device_remove);
/**
* phy_find_first - finds the first PHY device on the bus
* @bus: the target MII bus
*/
struct phy_device *phy_find_first(struct mii_bus *bus)
{
struct phy_device *phydev;
int addr;
for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
phydev = mdiobus_get_phy(bus, addr);
if (phydev)
return phydev;
}
return NULL;
}
EXPORT_SYMBOL(phy_find_first);
static void phy_link_change(struct phy_device *phydev, bool up)
{
struct net_device *netdev = phydev->attached_dev;
if (up)
netif_carrier_on(netdev);
else
netif_carrier_off(netdev);
phydev->adjust_link(netdev);
if (phydev->mii_ts && phydev->mii_ts->link_state)
phydev->mii_ts->link_state(phydev->mii_ts, phydev);
}
/**
* phy_prepare_link - prepares the PHY layer to monitor link status
* @phydev: target phy_device struct
* @handler: callback function for link status change notifications
*
* Description: Tells the PHY infrastructure to handle the
* gory details on monitoring link status (whether through
* polling or an interrupt), and to call back to the
* connected device driver when the link status changes.
* If you want to monitor your own link state, don't call
* this function.
*/
static void phy_prepare_link(struct phy_device *phydev,
void (*handler)(struct net_device *))
{
phydev->adjust_link = handler;
}
/**
* phy_connect_direct - connect an ethernet device to a specific phy_device
* @dev: the network device to connect
* @phydev: the pointer to the phy device
* @handler: callback function for state change notifications
* @interface: PHY device's interface
*/
int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
void (*handler)(struct net_device *),
phy_interface_t interface)
{
int rc;
if (!dev)
return -EINVAL;
rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
if (rc)
return rc;
phy_prepare_link(phydev, handler);
if (phy_interrupt_is_valid(phydev))
phy_request_interrupt(phydev);
return 0;
}
EXPORT_SYMBOL(phy_connect_direct);
/**
* phy_connect - connect an ethernet device to a PHY device
* @dev: the network device to connect
* @bus_id: the id string of the PHY device to connect
* @handler: callback function for state change notifications
* @interface: PHY device's interface
*
* Description: Convenience function for connecting ethernet
* devices to PHY devices. The default behavior is for
* the PHY infrastructure to handle everything, and only notify
* the connected driver when the link status changes. If you
* don't want, or can't use the provided functionality, you may
* choose to call only the subset of functions which provide
* the desired functionality.
*/
struct phy_device *phy_connect(struct net_device *dev, const char *bus_id,
void (*handler)(struct net_device *),
phy_interface_t interface)
{
struct phy_device *phydev;
struct device *d;
int rc;
/* Search the list of PHY devices on the mdio bus for the
* PHY with the requested name
*/
d = bus_find_device_by_name(&mdio_bus_type, NULL, bus_id);
if (!d) {
pr_err("PHY %s not found\n", bus_id);
return ERR_PTR(-ENODEV);
}
phydev = to_phy_device(d);
rc = phy_connect_direct(dev, phydev, handler, interface);
put_device(d);
if (rc)
return ERR_PTR(rc);
return phydev;
}
EXPORT_SYMBOL(phy_connect);
/**
* phy_disconnect - disable interrupts, stop state machine, and detach a PHY
* device
* @phydev: target phy_device struct
*/
void phy_disconnect(struct phy_device *phydev)
{
if (phy_is_started(phydev))
phy_stop(phydev);
if (phy_interrupt_is_valid(phydev))
phy_free_interrupt(phydev);
phydev->adjust_link = NULL;
phy_detach(phydev);
}
EXPORT_SYMBOL(phy_disconnect);
/**
* phy_poll_reset - Safely wait until a PHY reset has properly completed
* @phydev: The PHY device to poll
*
* Description: According to IEEE 802.3, Section 2, Subsection 22.2.4.1.1, as
* published in 2008, a PHY reset may take up to 0.5 seconds. The MII BMCR
* register must be polled until the BMCR_RESET bit clears.
*
* Furthermore, any attempts to write to PHY registers may have no effect
* or even generate MDIO bus errors until this is complete.
*
* Some PHYs (such as the Marvell 88E1111) don't entirely conform to the
* standard and do not fully reset after the BMCR_RESET bit is set, and may
* even *REQUIRE* a soft-reset to properly restart autonegotiation. In an
* effort to support such broken PHYs, this function is separate from the
* standard phy_init_hw() which will zero all the other bits in the BMCR
* and reapply all driver-specific and board-specific fixups.
*/
static int phy_poll_reset(struct phy_device *phydev)
{
/* Poll until the reset bit clears (50ms per retry == 0.6 sec) */
int ret, val;
ret = phy_read_poll_timeout(phydev, MII_BMCR, val, !(val & BMCR_RESET),
50000, 600000, true);
if (ret)
return ret;
/* Some chips (smsc911x) may still need up to another 1ms after the
* BMCR_RESET bit is cleared before they are usable.
*/
msleep(1);
return 0;
}
int phy_init_hw(struct phy_device *phydev)
{
int ret = 0;
/* Deassert the reset signal */
phy_device_reset(phydev, 0);
if (!phydev->drv)
return 0;
if (phydev->drv->soft_reset) {
ret = phydev->drv->soft_reset(phydev);
/* see comment in genphy_soft_reset for an explanation */
if (!ret)
phydev->suspended = 0;
}
if (ret < 0)
return ret;
ret = phy_scan_fixups(phydev);
if (ret < 0)
return ret;
if (phydev->drv->config_init)
ret = phydev->drv->config_init(phydev);
return ret;
}
EXPORT_SYMBOL(phy_init_hw);
void phy_attached_info(struct phy_device *phydev)
{
phy_attached_print(phydev, NULL);
}
EXPORT_SYMBOL(phy_attached_info);
#define ATTACHED_FMT "attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%s)"
char *phy_attached_info_irq(struct phy_device *phydev)
{
char *irq_str;
char irq_num[8];
switch(phydev->irq) {
case PHY_POLL:
irq_str = "POLL";
break;
case PHY_IGNORE_INTERRUPT:
irq_str = "IGNORE";
break;
default:
snprintf(irq_num, sizeof(irq_num), "%d", phydev->irq);
irq_str = irq_num;
break;
}
return kasprintf(GFP_KERNEL, "%s", irq_str);
}
EXPORT_SYMBOL(phy_attached_info_irq);
void phy_attached_print(struct phy_device *phydev, const char *fmt, ...)
{
const char *drv_name = phydev->drv ? phydev->drv->name : "unbound";
char *irq_str = phy_attached_info_irq(phydev);
if (!fmt) {
phydev_info(phydev, ATTACHED_FMT "\n",
drv_name, phydev_name(phydev),
irq_str);
} else {
va_list ap;
phydev_info(phydev, ATTACHED_FMT,
drv_name, phydev_name(phydev),
irq_str);
va_start(ap, fmt);
vprintk(fmt, ap);
va_end(ap);
}
kfree(irq_str);
}
EXPORT_SYMBOL(phy_attached_print);
static void phy_sysfs_create_links(struct phy_device *phydev)
{
struct net_device *dev = phydev->attached_dev;
int err;
if (!dev)
return;
err = sysfs_create_link(&phydev->mdio.dev.kobj, &dev->dev.kobj,
"attached_dev");
if (err)
return;
err = sysfs_create_link_nowarn(&dev->dev.kobj,
&phydev->mdio.dev.kobj,
"phydev");
if (err) {
dev_err(&dev->dev, "could not add device link to %s err %d\n",
kobject_name(&phydev->mdio.dev.kobj),
err);
/* non-fatal - some net drivers can use one netdevice
* with more then one phy
*/
}
phydev->sysfs_links = true;
}
static ssize_t
phy_standalone_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct phy_device *phydev = to_phy_device(dev);
return sprintf(buf, "%d\n", !phydev->attached_dev);
}
static DEVICE_ATTR_RO(phy_standalone);
/**
* phy_sfp_attach - attach the SFP bus to the PHY upstream network device
* @upstream: pointer to the phy device
* @bus: sfp bus representing cage being attached
*
* This is used to fill in the sfp_upstream_ops .attach member.
*/
void phy_sfp_attach(void *upstream, struct sfp_bus *bus)
{
struct phy_device *phydev = upstream;
if (phydev->attached_dev)
phydev->attached_dev->sfp_bus = bus;
phydev->sfp_bus_attached = true;
}
EXPORT_SYMBOL(phy_sfp_attach);
/**
* phy_sfp_detach - detach the SFP bus from the PHY upstream network device
* @upstream: pointer to the phy device
* @bus: sfp bus representing cage being attached
*
* This is used to fill in the sfp_upstream_ops .detach member.
*/
void phy_sfp_detach(void *upstream, struct sfp_bus *bus)
{
struct phy_device *phydev = upstream;
if (phydev->attached_dev)
phydev->attached_dev->sfp_bus = NULL;
phydev->sfp_bus_attached = false;
}
EXPORT_SYMBOL(phy_sfp_detach);
/**
* phy_sfp_probe - probe for a SFP cage attached to this PHY device
* @phydev: Pointer to phy_device
* @ops: SFP's upstream operations
*/
int phy_sfp_probe(struct phy_device *phydev,
const struct sfp_upstream_ops *ops)
{
struct sfp_bus *bus;
int ret = 0;
if (phydev->mdio.dev.fwnode) {
bus = sfp_bus_find_fwnode(phydev->mdio.dev.fwnode);
if (IS_ERR(bus))
return PTR_ERR(bus);
phydev->sfp_bus = bus;
ret = sfp_bus_add_upstream(bus, phydev, ops);
sfp_bus_put(bus);
}
return ret;
}
EXPORT_SYMBOL(phy_sfp_probe);
/**
* phy_attach_direct - attach a network device to a given PHY device pointer
* @dev: network device to attach
* @phydev: Pointer to phy_device to attach
* @flags: PHY device's dev_flags
* @interface: PHY device's interface
*
* Description: Called by drivers to attach to a particular PHY
* device. The phy_device is found, and properly hooked up
* to the phy_driver. If no driver is attached, then a
* generic driver is used. The phy_device is given a ptr to
* the attaching device, and given a callback for link status
* change. The phy_device is returned to the attaching driver.
* This function takes a reference on the phy device.
*/
int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
u32 flags, phy_interface_t interface)
{
struct mii_bus *bus = phydev->mdio.bus;
struct device *d = &phydev->mdio.dev;
struct module *ndev_owner = NULL;
bool using_genphy = false;
int err;
/* For Ethernet device drivers that register their own MDIO bus, we
* will have bus->owner match ndev_mod, so we do not want to increment
* our own module->refcnt here, otherwise we would not be able to
* unload later on.
*/
if (dev)
ndev_owner = dev->dev.parent->driver->owner;
if (ndev_owner != bus->owner && !try_module_get(bus->owner)) {
phydev_err(phydev, "failed to get the bus module\n");
return -EIO;
}
get_device(d);
/* Assume that if there is no driver, that it doesn't
* exist, and we should use the genphy driver.
*/
if (!d->driver) {
if (phydev->is_c45)
d->driver = &genphy_c45_driver.mdiodrv.driver;
else
d->driver = &genphy_driver.mdiodrv.driver;
using_genphy = true;
}
if (!try_module_get(d->driver->owner)) {
phydev_err(phydev, "failed to get the device driver module\n");
err = -EIO;
goto error_put_device;
}
if (using_genphy) {
err = d->driver->probe(d);
if (err >= 0)
err = device_bind_driver(d);
if (err)
goto error_module_put;
}
if (phydev->attached_dev) {
dev_err(&dev->dev, "PHY already attached\n");
err = -EBUSY;
goto error;
}
phydev->phy_link_change = phy_link_change;
if (dev) {
phydev->attached_dev = dev;
dev->phydev = phydev;
if (phydev->sfp_bus_attached)
dev->sfp_bus = phydev->sfp_bus;
}
/* Some Ethernet drivers try to connect to a PHY device before
* calling register_netdevice() -> netdev_register_kobject() and
* does the dev->dev.kobj initialization. Here we only check for
* success which indicates that the network device kobject is
* ready. Once we do that we still need to keep track of whether
* links were successfully set up or not for phy_detach() to
* remove them accordingly.
*/
phydev->sysfs_links = false;
phy_sysfs_create_links(phydev);
if (!phydev->attached_dev) {
err = sysfs_create_file(&phydev->mdio.dev.kobj,
&dev_attr_phy_standalone.attr);
if (err)
phydev_err(phydev, "error creating 'phy_standalone' sysfs entry\n");
}
phydev->dev_flags |= flags;
phydev->interface = interface;
phydev->state = PHY_READY;
/* Initial carrier state is off as the phy is about to be
* (re)initialized.
*/
if (dev)
netif_carrier_off(phydev->attached_dev);
/* Do initial configuration here, now that
* we have certain key parameters
* (dev_flags and interface)
*/
err = phy_init_hw(phydev);
if (err)
goto error;
err = phy_disable_interrupts(phydev);
if (err)
return err;
phy_resume(phydev);
phy_led_triggers_register(phydev);
return err;
error:
/* phy_detach() does all of the cleanup below */
phy_detach(phydev);
return err;
error_module_put:
module_put(d->driver->owner);
error_put_device:
put_device(d);
if (ndev_owner != bus->owner)
module_put(bus->owner);
return err;
}
EXPORT_SYMBOL(phy_attach_direct);
/**
* phy_attach - attach a network device to a particular PHY device
* @dev: network device to attach
* @bus_id: Bus ID of PHY device to attach
* @interface: PHY device's interface
*
* Description: Same as phy_attach_direct() except that a PHY bus_id
* string is passed instead of a pointer to a struct phy_device.
*/
struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
phy_interface_t interface)
{
struct bus_type *bus = &mdio_bus_type;
struct phy_device *phydev;
struct device *d;
int rc;
if (!dev)
return ERR_PTR(-EINVAL);
/* Search the list of PHY devices on the mdio bus for the
* PHY with the requested name
*/
d = bus_find_device_by_name(bus, NULL, bus_id);
if (!d) {
pr_err("PHY %s not found\n", bus_id);
return ERR_PTR(-ENODEV);
}
phydev = to_phy_device(d);
rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
put_device(d);
if (rc)
return ERR_PTR(rc);
return phydev;
}
EXPORT_SYMBOL(phy_attach);
static bool phy_driver_is_genphy_kind(struct phy_device *phydev,
struct device_driver *driver)
{
struct device *d = &phydev->mdio.dev;
bool ret = false;
if (!phydev->drv)
return ret;
get_device(d);
ret = d->driver == driver;
put_device(d);
return ret;
}
bool phy_driver_is_genphy(struct phy_device *phydev)
{
return phy_driver_is_genphy_kind(phydev,
&genphy_driver.mdiodrv.driver);
}
EXPORT_SYMBOL_GPL(phy_driver_is_genphy);
bool phy_driver_is_genphy_10g(struct phy_device *phydev)
{
return phy_driver_is_genphy_kind(phydev,
&genphy_c45_driver.mdiodrv.driver);
}
EXPORT_SYMBOL_GPL(phy_driver_is_genphy_10g);
/**
* phy_package_join - join a common PHY group
* @phydev: target phy_device struct
* @addr: cookie and PHY address for global register access
* @priv_size: if non-zero allocate this amount of bytes for private data
*
* This joins a PHY group and provides a shared storage for all phydevs in
* this group. This is intended to be used for packages which contain
* more than one PHY, for example a quad PHY transceiver.
*
* The addr parameter serves as a cookie which has to have the same value
* for all members of one group and as a PHY address to access generic
* registers of a PHY package. Usually, one of the PHY addresses of the
* different PHYs in the package provides access to these global registers.
* The address which is given here, will be used in the phy_package_read()
* and phy_package_write() convenience functions. If your PHY doesn't have
* global registers you can just pick any of the PHY addresses.
*
* This will set the shared pointer of the phydev to the shared storage.
* If this is the first call for a this cookie the shared storage will be
* allocated. If priv_size is non-zero, the given amount of bytes are
* allocated for the priv member.
*
* Returns < 1 on error, 0 on success. Esp. calling phy_package_join()
* with the same cookie but a different priv_size is an error.
*/
int phy_package_join(struct phy_device *phydev, int addr, size_t priv_size)
{
struct mii_bus *bus = phydev->mdio.bus;
struct phy_package_shared *shared;
int ret;
if (addr < 0 || addr >= PHY_MAX_ADDR)
return -EINVAL;
mutex_lock(&bus->shared_lock);
shared = bus->shared[addr];
if (!shared) {
ret = -ENOMEM;
shared = kzalloc(sizeof(*shared), GFP_KERNEL);
if (!shared)
goto err_unlock;
if (priv_size) {
shared->priv = kzalloc(priv_size, GFP_KERNEL);
if (!shared->priv)
goto err_free;
shared->priv_size = priv_size;
}
shared->addr = addr;
refcount_set(&shared->refcnt, 1);
bus->shared[addr] = shared;
} else {
ret = -EINVAL;
if (priv_size && priv_size != shared->priv_size)
goto err_unlock;
refcount_inc(&shared->refcnt);
}
mutex_unlock(&bus->shared_lock);
phydev->shared = shared;
return 0;
err_free:
kfree(shared);
err_unlock:
mutex_unlock(&bus->shared_lock);
return ret;
}
EXPORT_SYMBOL_GPL(phy_package_join);
/**
* phy_package_leave - leave a common PHY group
* @phydev: target phy_device struct
*
* This leaves a PHY group created by phy_package_join(). If this phydev
* was the last user of the shared data between the group, this data is
* freed. Resets the phydev->shared pointer to NULL.
*/
void phy_package_leave(struct phy_device *phydev)
{
struct phy_package_shared *shared = phydev->shared;
struct mii_bus *bus = phydev->mdio.bus;
if (!shared)
return;
if (refcount_dec_and_mutex_lock(&shared->refcnt, &bus->shared_lock)) {
bus->shared[shared->addr] = NULL;
mutex_unlock(&bus->shared_lock);
kfree(shared->priv);
kfree(shared);
}
phydev->shared = NULL;
}
EXPORT_SYMBOL_GPL(phy_package_leave);
static void devm_phy_package_leave(struct device *dev, void *res)
{
phy_package_leave(*(struct phy_device **)res);
}
/**
* devm_phy_package_join - resource managed phy_package_join()
* @dev: device that is registering this PHY package
* @phydev: target phy_device struct
* @addr: cookie and PHY address for global register access
* @priv_size: if non-zero allocate this amount of bytes for private data
*
* Managed phy_package_join(). Shared storage fetched by this function,
* phy_package_leave() is automatically called on driver detach. See
* phy_package_join() for more information.
*/
int devm_phy_package_join(struct device *dev, struct phy_device *phydev,
int addr, size_t priv_size)
{
struct phy_device **ptr;
int ret;
ptr = devres_alloc(devm_phy_package_leave, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return -ENOMEM;
ret = phy_package_join(phydev, addr, priv_size);
if (!ret) {
*ptr = phydev;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return ret;
}
EXPORT_SYMBOL_GPL(devm_phy_package_join);
/**
* phy_detach - detach a PHY device from its network device
* @phydev: target phy_device struct
*
* This detaches the phy device from its network device and the phy
* driver, and drops the reference count taken in phy_attach_direct().
*/
void phy_detach(struct phy_device *phydev)
{
struct net_device *dev = phydev->attached_dev;
struct module *ndev_owner = NULL;
struct mii_bus *bus;
if (phydev->sysfs_links) {
if (dev)
sysfs_remove_link(&dev->dev.kobj, "phydev");
sysfs_remove_link(&phydev->mdio.dev.kobj, "attached_dev");
}
if (!phydev->attached_dev)
sysfs_remove_file(&phydev->mdio.dev.kobj,
&dev_attr_phy_standalone.attr);
phy_suspend(phydev);
if (dev) {
phydev->attached_dev->phydev = NULL;
phydev->attached_dev = NULL;
}
phydev->phylink = NULL;
phy_led_triggers_unregister(phydev);
if (phydev->mdio.dev.driver)
module_put(phydev->mdio.dev.driver->owner);
/* If the device had no specific driver before (i.e. - it
* was using the generic driver), we unbind the device
* from the generic driver so that there's a chance a
* real driver could be loaded
*/
if (phy_driver_is_genphy(phydev) ||
phy_driver_is_genphy_10g(phydev))
device_release_driver(&phydev->mdio.dev);
/*
* The phydev might go away on the put_device() below, so avoid
* a use-after-free bug by reading the underlying bus first.
*/
bus = phydev->mdio.bus;
put_device(&phydev->mdio.dev);
if (dev)
ndev_owner = dev->dev.parent->driver->owner;
if (ndev_owner != bus->owner)
module_put(bus->owner);
/* Assert the reset signal */
phy_device_reset(phydev, 1);
}
EXPORT_SYMBOL(phy_detach);
int phy_suspend(struct phy_device *phydev)
{
struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
struct net_device *netdev = phydev->attached_dev;
struct phy_driver *phydrv = phydev->drv;
int ret;
if (phydev->suspended)
return 0;
/* If the device has WOL enabled, we cannot suspend the PHY */
phy_ethtool_get_wol(phydev, &wol);
if (wol.wolopts || (netdev && netdev->wol_enabled))
return -EBUSY;
if (!phydrv || !phydrv->suspend)
return 0;
ret = phydrv->suspend(phydev);
if (!ret)
phydev->suspended = true;
return ret;
}
EXPORT_SYMBOL(phy_suspend);
int __phy_resume(struct phy_device *phydev)
{
struct phy_driver *phydrv = phydev->drv;
int ret;
WARN_ON(!mutex_is_locked(&phydev->lock));
if (!phydrv || !phydrv->resume)
return 0;
ret = phydrv->resume(phydev);
if (!ret)
phydev->suspended = false;
return ret;
}
EXPORT_SYMBOL(__phy_resume);
int phy_resume(struct phy_device *phydev)
{
int ret;
mutex_lock(&phydev->lock);
ret = __phy_resume(phydev);
mutex_unlock(&phydev->lock);
return ret;
}
EXPORT_SYMBOL(phy_resume);
int phy_loopback(struct phy_device *phydev, bool enable)
{
struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
int ret = 0;
mutex_lock(&phydev->lock);
if (enable && phydev->loopback_enabled) {
ret = -EBUSY;
goto out;
}
if (!enable && !phydev->loopback_enabled) {
ret = -EINVAL;
goto out;
}
if (phydev->drv && phydrv->set_loopback)
ret = phydrv->set_loopback(phydev, enable);
else
ret = -EOPNOTSUPP;
if (ret)
goto out;
phydev->loopback_enabled = enable;
out:
mutex_unlock(&phydev->lock);
return ret;
}
EXPORT_SYMBOL(phy_loopback);
/**
* phy_reset_after_clk_enable - perform a PHY reset if needed
* @phydev: target phy_device struct
*
* Description: Some PHYs are known to need a reset after their refclk was
* enabled. This function evaluates the flags and perform the reset if it's
* needed. Returns < 0 on error, 0 if the phy wasn't reset and 1 if the phy
* was reset.
*/
int phy_reset_after_clk_enable(struct phy_device *phydev)
{
if (!phydev || !phydev->drv)
return -ENODEV;
if (phydev->drv->flags & PHY_RST_AFTER_CLK_EN) {
phy_device_reset(phydev, 1);
phy_device_reset(phydev, 0);
return 1;
}
return 0;
}
EXPORT_SYMBOL(phy_reset_after_clk_enable);
/* Generic PHY support and helper functions */
/**
* genphy_config_advert - sanitize and advertise auto-negotiation parameters
* @phydev: target phy_device struct
*
* Description: Writes MII_ADVERTISE with the appropriate values,
* after sanitizing the values to make sure we only advertise
* what is supported. Returns < 0 on error, 0 if the PHY's advertisement
* hasn't changed, and > 0 if it has changed.
*/
static int genphy_config_advert(struct phy_device *phydev)
{
int err, bmsr, changed = 0;
u32 adv;
/* Only allow advertising what this PHY supports */
linkmode_and(phydev->advertising, phydev->advertising,
phydev->supported);
adv = linkmode_adv_to_mii_adv_t(phydev->advertising);
/* Setup standard advertisement */
err = phy_modify_changed(phydev, MII_ADVERTISE,
ADVERTISE_ALL | ADVERTISE_100BASE4 |
ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM,
adv);
if (err < 0)
return err;
if (err > 0)
changed = 1;
bmsr = phy_read(phydev, MII_BMSR);
if (bmsr < 0)
return bmsr;
/* Per 802.3-2008, Section 22.2.4.2.16 Extended status all
* 1000Mbits/sec capable PHYs shall have the BMSR_ESTATEN bit set to a
* logical 1.
*/
if (!(bmsr & BMSR_ESTATEN))
return changed;
adv = linkmode_adv_to_mii_ctrl1000_t(phydev->advertising);
err = phy_modify_changed(phydev, MII_CTRL1000,
ADVERTISE_1000FULL | ADVERTISE_1000HALF,
adv);
if (err < 0)
return err;
if (err > 0)
changed = 1;
return changed;
}
/**
* genphy_c37_config_advert - sanitize and advertise auto-negotiation parameters
* @phydev: target phy_device struct
*
* Description: Writes MII_ADVERTISE with the appropriate values,
* after sanitizing the values to make sure we only advertise
* what is supported. Returns < 0 on error, 0 if the PHY's advertisement
* hasn't changed, and > 0 if it has changed. This function is intended
* for Clause 37 1000Base-X mode.
*/
static int genphy_c37_config_advert(struct phy_device *phydev)
{
u16 adv = 0;
/* Only allow advertising what this PHY supports */
linkmode_and(phydev->advertising, phydev->advertising,
phydev->supported);
if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
phydev->advertising))
adv |= ADVERTISE_1000XFULL;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->advertising))
adv |= ADVERTISE_1000XPAUSE;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->advertising))
adv |= ADVERTISE_1000XPSE_ASYM;
return phy_modify_changed(phydev, MII_ADVERTISE,
ADVERTISE_1000XFULL | ADVERTISE_1000XPAUSE |
ADVERTISE_1000XHALF | ADVERTISE_1000XPSE_ASYM,
adv);
}
/**
* genphy_config_eee_advert - disable unwanted eee mode advertisement
* @phydev: target phy_device struct
*
* Description: Writes MDIO_AN_EEE_ADV after disabling unsupported energy
* efficent ethernet modes. Returns 0 if the PHY's advertisement hasn't
* changed, and 1 if it has changed.
*/
int genphy_config_eee_advert(struct phy_device *phydev)
{
int err;
/* Nothing to disable */
if (!phydev->eee_broken_modes)
return 0;
err = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV,
phydev->eee_broken_modes, 0);
/* If the call failed, we assume that EEE is not supported */
return err < 0 ? 0 : err;
}
EXPORT_SYMBOL(genphy_config_eee_advert);
/**
* genphy_setup_forced - configures/forces speed/duplex from @phydev
* @phydev: target phy_device struct
*
* Description: Configures MII_BMCR to force speed/duplex
* to the values in phydev. Assumes that the values are valid.
* Please see phy_sanitize_settings().
*/
int genphy_setup_forced(struct phy_device *phydev)
{
u16 ctl = 0;
phydev->pause = 0;
phydev->asym_pause = 0;
if (SPEED_1000 == phydev->speed)
ctl |= BMCR_SPEED1000;
else if (SPEED_100 == phydev->speed)
ctl |= BMCR_SPEED100;
if (DUPLEX_FULL == phydev->duplex)
ctl |= BMCR_FULLDPLX;
return phy_modify(phydev, MII_BMCR,
~(BMCR_LOOPBACK | BMCR_ISOLATE | BMCR_PDOWN), ctl);
}
EXPORT_SYMBOL(genphy_setup_forced);
static int genphy_setup_master_slave(struct phy_device *phydev)
{
u16 ctl = 0;
if (!phydev->is_gigabit_capable)
return 0;
switch (phydev->master_slave_set) {
case MASTER_SLAVE_CFG_MASTER_PREFERRED:
ctl |= CTL1000_PREFER_MASTER;
break;
case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
break;
case MASTER_SLAVE_CFG_MASTER_FORCE:
ctl |= CTL1000_AS_MASTER;
fallthrough;
case MASTER_SLAVE_CFG_SLAVE_FORCE:
ctl |= CTL1000_ENABLE_MASTER;
break;
case MASTER_SLAVE_CFG_UNKNOWN:
case MASTER_SLAVE_CFG_UNSUPPORTED:
return 0;
default:
phydev_warn(phydev, "Unsupported Master/Slave mode\n");
return -EOPNOTSUPP;
}
return phy_modify_changed(phydev, MII_CTRL1000,
(CTL1000_ENABLE_MASTER | CTL1000_AS_MASTER |
CTL1000_PREFER_MASTER), ctl);
}
static int genphy_read_master_slave(struct phy_device *phydev)
{
int cfg, state;
int val;
if (!phydev->is_gigabit_capable) {
phydev->master_slave_get = MASTER_SLAVE_CFG_UNSUPPORTED;
phydev->master_slave_state = MASTER_SLAVE_STATE_UNSUPPORTED;
return 0;
}
phydev->master_slave_get = MASTER_SLAVE_CFG_UNKNOWN;
phydev->master_slave_state = MASTER_SLAVE_STATE_UNKNOWN;
val = phy_read(phydev, MII_CTRL1000);
if (val < 0)
return val;
if (val & CTL1000_ENABLE_MASTER) {
if (val & CTL1000_AS_MASTER)
cfg = MASTER_SLAVE_CFG_MASTER_FORCE;
else
cfg = MASTER_SLAVE_CFG_SLAVE_FORCE;
} else {
if (val & CTL1000_PREFER_MASTER)
cfg = MASTER_SLAVE_CFG_MASTER_PREFERRED;
else
cfg = MASTER_SLAVE_CFG_SLAVE_PREFERRED;
}
val = phy_read(phydev, MII_STAT1000);
if (val < 0)
return val;
if (val & LPA_1000MSFAIL) {
state = MASTER_SLAVE_STATE_ERR;
} else if (phydev->link) {
/* this bits are valid only for active link */
if (val & LPA_1000MSRES)
state = MASTER_SLAVE_STATE_MASTER;
else
state = MASTER_SLAVE_STATE_SLAVE;
} else {
state = MASTER_SLAVE_STATE_UNKNOWN;
}
phydev->master_slave_get = cfg;
phydev->master_slave_state = state;
return 0;
}
/**
* genphy_restart_aneg - Enable and Restart Autonegotiation
* @phydev: target phy_device struct
*/
int genphy_restart_aneg(struct phy_device *phydev)
{
/* Don't isolate the PHY if we're negotiating */
return phy_modify(phydev, MII_BMCR, BMCR_ISOLATE,
BMCR_ANENABLE | BMCR_ANRESTART);
}
EXPORT_SYMBOL(genphy_restart_aneg);
/**
* genphy_check_and_restart_aneg - Enable and restart auto-negotiation
* @phydev: target phy_device struct
* @restart: whether aneg restart is requested
*
* Check, and restart auto-negotiation if needed.
*/
int genphy_check_and_restart_aneg(struct phy_device *phydev, bool restart)
{
int ret;
if (!restart) {
/* Advertisement hasn't changed, but maybe aneg was never on to
* begin with? Or maybe phy was isolated?
*/
ret = phy_read(phydev, MII_BMCR);
if (ret < 0)
return ret;
if (!(ret & BMCR_ANENABLE) || (ret & BMCR_ISOLATE))
restart = true;
}
if (restart)
return genphy_restart_aneg(phydev);
return 0;
}
EXPORT_SYMBOL(genphy_check_and_restart_aneg);
/**
* __genphy_config_aneg - restart auto-negotiation or write BMCR
* @phydev: target phy_device struct
* @changed: whether autoneg is requested
*
* Description: If auto-negotiation is enabled, we configure the
* advertising, and then restart auto-negotiation. If it is not
* enabled, then we write the BMCR.
*/
int __genphy_config_aneg(struct phy_device *phydev, bool changed)
{
int err;
if (genphy_config_eee_advert(phydev))
changed = true;
err = genphy_setup_master_slave(phydev);
if (err < 0)
return err;
else if (err)
changed = true;
if (AUTONEG_ENABLE != phydev->autoneg)
return genphy_setup_forced(phydev);
err = genphy_config_advert(phydev);
if (err < 0) /* error */
return err;
else if (err)
changed = true;
return genphy_check_and_restart_aneg(phydev, changed);
}
EXPORT_SYMBOL(__genphy_config_aneg);
/**
* genphy_c37_config_aneg - restart auto-negotiation or write BMCR
* @phydev: target phy_device struct
*
* Description: If auto-negotiation is enabled, we configure the
* advertising, and then restart auto-negotiation. If it is not
* enabled, then we write the BMCR. This function is intended
* for use with Clause 37 1000Base-X mode.
*/
int genphy_c37_config_aneg(struct phy_device *phydev)
{
int err, changed;
if (phydev->autoneg != AUTONEG_ENABLE)
return genphy_setup_forced(phydev);
err = phy_modify(phydev, MII_BMCR, BMCR_SPEED1000 | BMCR_SPEED100,
BMCR_SPEED1000);
if (err)
return err;
changed = genphy_c37_config_advert(phydev);
if (changed < 0) /* error */
return changed;
if (!changed) {
/* Advertisement hasn't changed, but maybe aneg was never on to
* begin with? Or maybe phy was isolated?
*/
int ctl = phy_read(phydev, MII_BMCR);
if (ctl < 0)
return ctl;
if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
changed = 1; /* do restart aneg */
}
/* Only restart aneg if we are advertising something different
* than we were before.
*/
if (changed > 0)
return genphy_restart_aneg(phydev);
return 0;
}
EXPORT_SYMBOL(genphy_c37_config_aneg);
/**
* genphy_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.
*/
int genphy_aneg_done(struct phy_device *phydev)
{
int retval = phy_read(phydev, MII_BMSR);
return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
}
EXPORT_SYMBOL(genphy_aneg_done);
/**
* genphy_update_link - update link status in @phydev
* @phydev: target phy_device struct
*
* Description: Update the value in phydev->link to reflect the
* current link value. In order to do this, we need to read
* the status register twice, keeping the second value.
*/
int genphy_update_link(struct phy_device *phydev)
{
int status = 0, bmcr;
bmcr = phy_read(phydev, MII_BMCR);
if (bmcr < 0)
return bmcr;
/* Autoneg is being started, therefore disregard BMSR value and
* report link as down.
*/
if (bmcr & BMCR_ANRESTART)
goto done;
/* The link state is latched low so that momentary link
* drops can be detected. Do not double-read the status
* in polling mode to detect such short link drops except
* the link was already down.
*/
if (!phy_polling_mode(phydev) || !phydev->link) {
status = phy_read(phydev, MII_BMSR);
if (status < 0)
return status;
else if (status & BMSR_LSTATUS)
goto done;
}
/* Read link and autonegotiation status */
status = phy_read(phydev, MII_BMSR);
if (status < 0)
return status;
done:
phydev->link = status & BMSR_LSTATUS ? 1 : 0;
phydev->autoneg_complete = status & BMSR_ANEGCOMPLETE ? 1 : 0;
/* Consider the case that autoneg was started and "aneg complete"
* bit has been reset, but "link up" bit not yet.
*/
if (phydev->autoneg == AUTONEG_ENABLE && !phydev->autoneg_complete)
phydev->link = 0;
return 0;
}
EXPORT_SYMBOL(genphy_update_link);
int genphy_read_lpa(struct phy_device *phydev)
{
int lpa, lpagb;
if (phydev->autoneg == AUTONEG_ENABLE) {
if (!phydev->autoneg_complete) {
mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising,
0);
mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
return 0;
}
if (phydev->is_gigabit_capable) {
lpagb = phy_read(phydev, MII_STAT1000);
if (lpagb < 0)
return lpagb;
if (lpagb & LPA_1000MSFAIL) {
int adv = phy_read(phydev, MII_CTRL1000);
if (adv < 0)
return adv;
if (adv & CTL1000_ENABLE_MASTER)
phydev_err(phydev, "Master/Slave resolution failed, maybe conflicting manual settings?\n");
else
phydev_err(phydev, "Master/Slave resolution failed\n");
return -ENOLINK;
}
mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising,
lpagb);
}
lpa = phy_read(phydev, MII_LPA);
if (lpa < 0)
return lpa;
mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, lpa);
} else {
linkmode_zero(phydev->lp_advertising);
}
return 0;
}
EXPORT_SYMBOL(genphy_read_lpa);
/**
* genphy_read_status_fixed - read the link parameters for !aneg mode
* @phydev: target phy_device struct
*
* Read the current duplex and speed state for a PHY operating with
* autonegotiation disabled.
*/
int genphy_read_status_fixed(struct phy_device *phydev)
{
int bmcr = phy_read(phydev, MII_BMCR);
if (bmcr < 0)
return bmcr;
if (bmcr & BMCR_FULLDPLX)
phydev->duplex = DUPLEX_FULL;
else
phydev->duplex = DUPLEX_HALF;
if (bmcr & BMCR_SPEED1000)
phydev->speed = SPEED_1000;
else if (bmcr & BMCR_SPEED100)
phydev->speed = SPEED_100;
else
phydev->speed = SPEED_10;
return 0;
}
EXPORT_SYMBOL(genphy_read_status_fixed);
/**
* genphy_read_status - check the link status and update current link state
* @phydev: target phy_device struct
*
* Description: Check the link, then figure out the current state
* by comparing what we advertise with what the link partner
* advertises. Start by checking the gigabit possibilities,
* then move on to 10/100.
*/
int genphy_read_status(struct phy_device *phydev)
{
int err, old_link = phydev->link;
/* Update the link, but return if there was an error */
err = genphy_update_link(phydev);
if (err)
return err;
/* why bother the PHY if nothing can have changed */
if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
return 0;
phydev->speed = SPEED_UNKNOWN;
phydev->duplex = DUPLEX_UNKNOWN;
phydev->pause = 0;
phydev->asym_pause = 0;
err = genphy_read_master_slave(phydev);
if (err < 0)
return err;
err = genphy_read_lpa(phydev);
if (err < 0)
return err;
if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
phy_resolve_aneg_linkmode(phydev);
} else if (phydev->autoneg == AUTONEG_DISABLE) {
err = genphy_read_status_fixed(phydev);
if (err < 0)
return err;
}
return 0;
}
EXPORT_SYMBOL(genphy_read_status);
/**
* genphy_c37_read_status - check the link status and update current link state
* @phydev: target phy_device struct
*
* Description: Check the link, then figure out the current state
* by comparing what we advertise with what the link partner
* advertises. This function is for Clause 37 1000Base-X mode.
*/
int genphy_c37_read_status(struct phy_device *phydev)
{
int lpa, err, old_link = phydev->link;
/* Update the link, but return if there was an error */
err = genphy_update_link(phydev);
if (err)
return err;
/* why bother the PHY if nothing can have changed */
if (phydev->autoneg == AUTONEG_ENABLE && old_link && phydev->link)
return 0;
phydev->duplex = DUPLEX_UNKNOWN;
phydev->pause = 0;
phydev->asym_pause = 0;
if (phydev->autoneg == AUTONEG_ENABLE && phydev->autoneg_complete) {
lpa = phy_read(phydev, MII_LPA);
if (lpa < 0)
return lpa;
linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->lp_advertising, lpa & LPA_LPACK);
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
phydev->lp_advertising, lpa & LPA_1000XFULL);
linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->lp_advertising, lpa & LPA_1000XPAUSE);
linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->lp_advertising,
lpa & LPA_1000XPAUSE_ASYM);
phy_resolve_aneg_linkmode(phydev);
} else if (phydev->autoneg == AUTONEG_DISABLE) {
int bmcr = phy_read(phydev, MII_BMCR);
if (bmcr < 0)
return bmcr;
if (bmcr & BMCR_FULLDPLX)
phydev->duplex = DUPLEX_FULL;
else
phydev->duplex = DUPLEX_HALF;
}
return 0;
}
EXPORT_SYMBOL(genphy_c37_read_status);
/**
* genphy_soft_reset - software reset the PHY via BMCR_RESET bit
* @phydev: target phy_device struct
*
* Description: Perform a software PHY reset using the standard
* BMCR_RESET bit and poll for the reset bit to be cleared.
*
* Returns: 0 on success, < 0 on failure
*/
int genphy_soft_reset(struct phy_device *phydev)
{
u16 res = BMCR_RESET;
int ret;
if (phydev->autoneg == AUTONEG_ENABLE)
res |= BMCR_ANRESTART;
ret = phy_modify(phydev, MII_BMCR, BMCR_ISOLATE, res);
if (ret < 0)
return ret;
/* Clause 22 states that setting bit BMCR_RESET sets control registers
* to their default value. Therefore the POWER DOWN bit is supposed to
* be cleared after soft reset.
*/
phydev->suspended = 0;
ret = phy_poll_reset(phydev);
if (ret)
return ret;
/* BMCR may be reset to defaults */
if (phydev->autoneg == AUTONEG_DISABLE)
ret = genphy_setup_forced(phydev);
return ret;
}
EXPORT_SYMBOL(genphy_soft_reset);
/**
* genphy_read_abilities - read PHY abilities from Clause 22 registers
* @phydev: target phy_device struct
*
* Description: Reads the PHY's abilities and populates
* phydev->supported accordingly.
*
* Returns: 0 on success, < 0 on failure
*/
int genphy_read_abilities(struct phy_device *phydev)
{
int val;
linkmode_set_bit_array(phy_basic_ports_array,
ARRAY_SIZE(phy_basic_ports_array),
phydev->supported);
val = phy_read(phydev, MII_BMSR);
if (val < 0)
return val;
linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported,
val & BMSR_ANEGCAPABLE);
linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, phydev->supported,
val & BMSR_100FULL);
linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, phydev->supported,
val & BMSR_100HALF);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, phydev->supported,
val & BMSR_10FULL);
linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, phydev->supported,
val & BMSR_10HALF);
if (val & BMSR_ESTATEN) {
val = phy_read(phydev, MII_ESTATUS);
if (val < 0)
return val;
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
phydev->supported, val & ESTATUS_1000_TFULL);
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
phydev->supported, val & ESTATUS_1000_THALF);
linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
phydev->supported, val & ESTATUS_1000_XFULL);
}
return 0;
}
EXPORT_SYMBOL(genphy_read_abilities);
/* This is used for the phy device which doesn't support the MMD extended
* register access, but it does have side effect when we are trying to access
* the MMD register via indirect method.
*/
int genphy_read_mmd_unsupported(struct phy_device *phdev, int devad, u16 regnum)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(genphy_read_mmd_unsupported);
int genphy_write_mmd_unsupported(struct phy_device *phdev, int devnum,
u16 regnum, u16 val)
{
return -EOPNOTSUPP;
}
EXPORT_SYMBOL(genphy_write_mmd_unsupported);
int genphy_suspend(struct phy_device *phydev)
{
return phy_set_bits(phydev, MII_BMCR, BMCR_PDOWN);
}
EXPORT_SYMBOL(genphy_suspend);
int genphy_resume(struct phy_device *phydev)
{
return phy_clear_bits(phydev, MII_BMCR, BMCR_PDOWN);
}
EXPORT_SYMBOL(genphy_resume);
int genphy_loopback(struct phy_device *phydev, bool enable)
{
return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK,
enable ? BMCR_LOOPBACK : 0);
}
EXPORT_SYMBOL(genphy_loopback);
/**
* phy_remove_link_mode - Remove a supported link mode
* @phydev: phy_device structure to remove link mode from
* @link_mode: Link mode to be removed
*
* Description: Some MACs don't support all link modes which the PHY
* does. e.g. a 1G MAC often does not support 1000Half. Add a helper
* to remove a link mode.
*/
void phy_remove_link_mode(struct phy_device *phydev, u32 link_mode)
{
linkmode_clear_bit(link_mode, phydev->supported);
phy_advertise_supported(phydev);
}
EXPORT_SYMBOL(phy_remove_link_mode);
static void phy_copy_pause_bits(unsigned long *dst, unsigned long *src)
{
linkmode_mod_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, dst,
linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, src));
linkmode_mod_bit(ETHTOOL_LINK_MODE_Pause_BIT, dst,
linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT, src));
}
/**
* phy_advertise_supported - Advertise all supported modes
* @phydev: target phy_device struct
*
* Description: Called to advertise all supported modes, doesn't touch
* pause mode advertising.
*/
void phy_advertise_supported(struct phy_device *phydev)
{
__ETHTOOL_DECLARE_LINK_MODE_MASK(new);
linkmode_copy(new, phydev->supported);
phy_copy_pause_bits(new, phydev->advertising);
linkmode_copy(phydev->advertising, new);
}
EXPORT_SYMBOL(phy_advertise_supported);
/**
* phy_support_sym_pause - Enable support of symmetrical pause
* @phydev: target phy_device struct
*
* Description: Called by the MAC to indicate is supports symmetrical
* Pause, but not asym pause.
*/
void phy_support_sym_pause(struct phy_device *phydev)
{
linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported);
phy_copy_pause_bits(phydev->advertising, phydev->supported);
}
EXPORT_SYMBOL(phy_support_sym_pause);
/**
* phy_support_asym_pause - Enable support of asym pause
* @phydev: target phy_device struct
*
* Description: Called by the MAC to indicate is supports Asym Pause.
*/
void phy_support_asym_pause(struct phy_device *phydev)
{
phy_copy_pause_bits(phydev->advertising, phydev->supported);
}
EXPORT_SYMBOL(phy_support_asym_pause);
/**
* phy_set_sym_pause - Configure symmetric Pause
* @phydev: target phy_device struct
* @rx: Receiver Pause is supported
* @tx: Transmit Pause is supported
* @autoneg: Auto neg should be used
*
* Description: Configure advertised Pause support depending on if
* receiver pause and pause auto neg is supported. Generally called
* from the set_pauseparam .ndo.
*/
void phy_set_sym_pause(struct phy_device *phydev, bool rx, bool tx,
bool autoneg)
{
linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported);
if (rx && tx && autoneg)
linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->supported);
linkmode_copy(phydev->advertising, phydev->supported);
}
EXPORT_SYMBOL(phy_set_sym_pause);
/**
* phy_set_asym_pause - Configure Pause and Asym Pause
* @phydev: target phy_device struct
* @rx: Receiver Pause is supported
* @tx: Transmit Pause is supported
*
* Description: Configure advertised Pause support depending on if
* transmit and receiver pause is supported. If there has been a
* change in adverting, trigger a new autoneg. Generally called from
* the set_pauseparam .ndo.
*/
void phy_set_asym_pause(struct phy_device *phydev, bool rx, bool tx)
{
__ETHTOOL_DECLARE_LINK_MODE_MASK(oldadv);
linkmode_copy(oldadv, phydev->advertising);
linkmode_set_pause(phydev->advertising, tx, rx);
if (!linkmode_equal(oldadv, phydev->advertising) &&
phydev->autoneg)
phy_start_aneg(phydev);
}
EXPORT_SYMBOL(phy_set_asym_pause);
/**
* phy_validate_pause - Test if the PHY/MAC support the pause configuration
* @phydev: phy_device struct
* @pp: requested pause configuration
*
* Description: Test if the PHY/MAC combination supports the Pause
* configuration the user is requesting. Returns True if it is
* supported, false otherwise.
*/
bool phy_validate_pause(struct phy_device *phydev,
struct ethtool_pauseparam *pp)
{
if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->supported) && pp->rx_pause)
return false;
if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->supported) &&
pp->rx_pause != pp->tx_pause)
return false;
return true;
}
EXPORT_SYMBOL(phy_validate_pause);
/**
* phy_get_pause - resolve negotiated pause modes
* @phydev: phy_device struct
* @tx_pause: pointer to bool to indicate whether transmit pause should be
* enabled.
* @rx_pause: pointer to bool to indicate whether receive pause should be
* enabled.
*
* Resolve and return the flow control modes according to the negotiation
* result. This includes checking that we are operating in full duplex mode.
* See linkmode_resolve_pause() for further details.
*/
void phy_get_pause(struct phy_device *phydev, bool *tx_pause, bool *rx_pause)
{
if (phydev->duplex != DUPLEX_FULL) {
*tx_pause = false;
*rx_pause = false;
return;
}
return linkmode_resolve_pause(phydev->advertising,
phydev->lp_advertising,
tx_pause, rx_pause);
}
EXPORT_SYMBOL(phy_get_pause);
#if IS_ENABLED(CONFIG_OF_MDIO)
static int phy_get_int_delay_property(struct device *dev, const char *name)
{
s32 int_delay;
int ret;
ret = device_property_read_u32(dev, name, &int_delay);
if (ret)
return ret;
return int_delay;
}
#else
static int phy_get_int_delay_property(struct device *dev, const char *name)
{
return -EINVAL;
}
#endif
/**
* phy_get_delay_index - returns the index of the internal delay
* @phydev: phy_device struct
* @dev: pointer to the devices device struct
* @delay_values: array of delays the PHY supports
* @size: the size of the delay array
* @is_rx: boolean to indicate to get the rx internal delay
*
* Returns the index within the array of internal delay passed in.
* If the device property is not present then the interface type is checked
* if the interface defines use of internal delay then a 1 is returned otherwise
* a 0 is returned.
* The array must be in ascending order. If PHY does not have an ascending order
* array then size = 0 and the value of the delay property is returned.
* Return -EINVAL if the delay is invalid or cannot be found.
*/
s32 phy_get_internal_delay(struct phy_device *phydev, struct device *dev,
const int *delay_values, int size, bool is_rx)
{
s32 delay;
int i;
if (is_rx) {
delay = phy_get_int_delay_property(dev, "rx-internal-delay-ps");
if (delay < 0 && size == 0) {
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
return 1;
else
return 0;
}
} else {
delay = phy_get_int_delay_property(dev, "tx-internal-delay-ps");
if (delay < 0 && size == 0) {
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
return 1;
else
return 0;
}
}
if (delay < 0)
return delay;
if (delay && size == 0)
return delay;
if (delay < delay_values[0] || delay > delay_values[size - 1]) {
phydev_err(phydev, "Delay %d is out of range\n", delay);
return -EINVAL;
}
if (delay == delay_values[0])
return 0;
for (i = 1; i < size; i++) {
if (delay == delay_values[i])
return i;
/* Find an approximate index by looking up the table */
if (delay > delay_values[i - 1] &&
delay < delay_values[i]) {
if (delay - delay_values[i - 1] <
delay_values[i] - delay)
return i - 1;
else
return i;
}
}
phydev_err(phydev, "error finding internal delay index for %d\n",
delay);
return -EINVAL;
}
EXPORT_SYMBOL(phy_get_internal_delay);
static bool phy_drv_supports_irq(struct phy_driver *phydrv)
{
return phydrv->config_intr && phydrv->ack_interrupt;
}
/**
* phy_probe - probe and init a PHY device
* @dev: device to probe and init
*
* Description: Take care of setting up the phy_device structure,
* set the state to READY (the driver's init function should
* set it to STARTING if needed).
*/
static int phy_probe(struct device *dev)
{
struct phy_device *phydev = to_phy_device(dev);
struct device_driver *drv = phydev->mdio.dev.driver;
struct phy_driver *phydrv = to_phy_driver(drv);
int err = 0;
phydev->drv = phydrv;
/* Disable the interrupt if the PHY doesn't support it
* but the interrupt is still a valid one
*/
if (!phy_drv_supports_irq(phydrv) && phy_interrupt_is_valid(phydev))
phydev->irq = PHY_POLL;
if (phydrv->flags & PHY_IS_INTERNAL)
phydev->is_internal = true;
mutex_lock(&phydev->lock);
/* Deassert the reset signal */
phy_device_reset(phydev, 0);
if (phydev->drv->probe) {
err = phydev->drv->probe(phydev);
if (err)
goto out;
}
/* Start out supporting everything. Eventually,
* a controller will attach, and may modify one
* or both of these values
*/
if (phydrv->features) {
linkmode_copy(phydev->supported, phydrv->features);
} else if (phydrv->get_features) {
err = phydrv->get_features(phydev);
} else if (phydev->is_c45) {
err = genphy_c45_pma_read_abilities(phydev);
} else {
err = genphy_read_abilities(phydev);
}
if (err)
goto out;
if (!linkmode_test_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
phydev->supported))
phydev->autoneg = 0;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
phydev->supported))
phydev->is_gigabit_capable = 1;
if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
phydev->supported))
phydev->is_gigabit_capable = 1;
of_set_phy_supported(phydev);
phy_advertise_supported(phydev);
/* Get the EEE modes we want to prohibit. We will ask
* the PHY stop advertising these mode later on
*/
of_set_phy_eee_broken(phydev);
/* The Pause Frame bits indicate that the PHY can support passing
* pause frames. During autonegotiation, the PHYs will determine if
* they should allow pause frames to pass. The MAC driver should then
* use that result to determine whether to enable flow control via
* pause frames.
*
* Normally, PHY drivers should not set the Pause bits, and instead
* allow phylib to do that. However, there may be some situations
* (e.g. hardware erratum) where the driver wants to set only one
* of these bits.
*/
if (!test_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported) &&
!test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported)) {
linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->supported);
linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->supported);
}
/* Set the state to READY by default */
phydev->state = PHY_READY;
out:
/* Assert the reset signal */
if (err)
phy_device_reset(phydev, 1);
mutex_unlock(&phydev->lock);
return err;
}
static int phy_remove(struct device *dev)
{
struct phy_device *phydev = to_phy_device(dev);
cancel_delayed_work_sync(&phydev->state_queue);
mutex_lock(&phydev->lock);
phydev->state = PHY_DOWN;
mutex_unlock(&phydev->lock);
sfp_bus_del_upstream(phydev->sfp_bus);
phydev->sfp_bus = NULL;
if (phydev->drv && phydev->drv->remove)
phydev->drv->remove(phydev);
/* Assert the reset signal */
phy_device_reset(phydev, 1);
phydev->drv = NULL;
return 0;
}
/**
* phy_driver_register - register a phy_driver with the PHY layer
* @new_driver: new phy_driver to register
* @owner: module owning this PHY
*/
int phy_driver_register(struct phy_driver *new_driver, struct module *owner)
{
int retval;
/* Either the features are hard coded, or dynamically
* determined. It cannot be both.
*/
if (WARN_ON(new_driver->features && new_driver->get_features)) {
pr_err("%s: features and get_features must not both be set\n",
new_driver->name);
return -EINVAL;
}
new_driver->mdiodrv.flags |= MDIO_DEVICE_IS_PHY;
new_driver->mdiodrv.driver.name = new_driver->name;
new_driver->mdiodrv.driver.bus = &mdio_bus_type;
new_driver->mdiodrv.driver.probe = phy_probe;
new_driver->mdiodrv.driver.remove = phy_remove;
new_driver->mdiodrv.driver.owner = owner;
new_driver->mdiodrv.driver.probe_type = PROBE_FORCE_SYNCHRONOUS;
retval = driver_register(&new_driver->mdiodrv.driver);
if (retval) {
pr_err("%s: Error %d in registering driver\n",
new_driver->name, retval);
return retval;
}
pr_debug("%s: Registered new driver\n", new_driver->name);
return 0;
}
EXPORT_SYMBOL(phy_driver_register);
int phy_drivers_register(struct phy_driver *new_driver, int n,
struct module *owner)
{
int i, ret = 0;
for (i = 0; i < n; i++) {
ret = phy_driver_register(new_driver + i, owner);
if (ret) {
while (i-- > 0)
phy_driver_unregister(new_driver + i);
break;
}
}
return ret;
}
EXPORT_SYMBOL(phy_drivers_register);
void phy_driver_unregister(struct phy_driver *drv)
{
driver_unregister(&drv->mdiodrv.driver);
}
EXPORT_SYMBOL(phy_driver_unregister);
void phy_drivers_unregister(struct phy_driver *drv, int n)
{
int i;
for (i = 0; i < n; i++)
phy_driver_unregister(drv + i);
}
EXPORT_SYMBOL(phy_drivers_unregister);
static struct phy_driver genphy_driver = {
.phy_id = 0xffffffff,
.phy_id_mask = 0xffffffff,
.name = "Generic PHY",
.get_features = genphy_read_abilities,
.suspend = genphy_suspend,
.resume = genphy_resume,
.set_loopback = genphy_loopback,
};
static const struct ethtool_phy_ops phy_ethtool_phy_ops = {
.get_sset_count = phy_ethtool_get_sset_count,
.get_strings = phy_ethtool_get_strings,
.get_stats = phy_ethtool_get_stats,
.start_cable_test = phy_start_cable_test,
.start_cable_test_tdr = phy_start_cable_test_tdr,
};
static int __init phy_init(void)
{
int rc;
rc = mdio_bus_init();
if (rc)
return rc;
ethtool_set_ethtool_phy_ops(&phy_ethtool_phy_ops);
features_init();
rc = phy_driver_register(&genphy_c45_driver, THIS_MODULE);
if (rc)
goto err_c45;
rc = phy_driver_register(&genphy_driver, THIS_MODULE);
if (rc) {
phy_driver_unregister(&genphy_c45_driver);
err_c45:
mdio_bus_exit();
}
return rc;
}
static void __exit phy_exit(void)
{
phy_driver_unregister(&genphy_c45_driver);
phy_driver_unregister(&genphy_driver);
mdio_bus_exit();
ethtool_set_ethtool_phy_ops(NULL);
}
subsys_initcall(phy_init);
module_exit(phy_exit);
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