linux/drivers/net/phy/phy_device.c

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/* Framework for finding and configuring PHYs.
* Also contains generic PHY driver
*
* Author: Andy Fleming
*
* Copyright (c) 2004 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/bitmap.h>
#include <linux/phy.h>
#include <linux/phy_led_triggers.h>
#include <linux/mdio.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/of.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);
static const int phy_basic_ports_array[] = {
ETHTOOL_LINK_MODE_Autoneg_BIT,
ETHTOOL_LINK_MODE_TP_BIT,
ETHTOOL_LINK_MODE_MII_BIT,
};
EXPORT_SYMBOL_GPL(phy_basic_ports_array);
static const int phy_fibre_port_array[] = {
ETHTOOL_LINK_MODE_FIBRE_BIT,
};
EXPORT_SYMBOL_GPL(phy_fibre_port_array);
static const int phy_all_ports_features_array[] = {
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_100baseT_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);
__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);
}
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;
extern struct phy_driver genphy_10g_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)
return !phydev->suspended;
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;
return true;
}
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;
return phy_suspend(phydev);
}
static int mdio_bus_phy_resume(struct device *dev)
{
struct phy_device *phydev = to_phy_device(dev);
int ret;
if (!mdio_bus_phy_may_suspend(phydev))
goto no_resume;
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.devices_in_package & (1 << i)))
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,
};
struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
bool is_c45,
struct phy_c45_device_ids *c45_ids)
{
struct phy_device *dev;
struct mdio_device *mdiodev;
/* 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 = 0;
dev->duplex = -1;
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);
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->devices_in_package & (1 << i)))
continue;
request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT,
MDIO_ID_ARGS(c45_ids->device_ids[i]));
}
} else {
request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT,
MDIO_ID_ARGS(phy_id));
}
device_initialize(&mdiodev->dev);
return dev;
}
EXPORT_SYMBOL(phy_device_create);
/* 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, reg_addr;
reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS2;
phy_reg = mdiobus_read(bus, addr, reg_addr);
if (phy_reg < 0)
return -EIO;
*devices_in_package = (phy_reg & 0xffff) << 16;
reg_addr = MII_ADDR_C45 | dev_addr << 16 | MDIO_DEVS1;
phy_reg = mdiobus_read(bus, addr, reg_addr);
if (phy_reg < 0)
return -EIO;
*devices_in_package |= (phy_reg & 0xffff);
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
* @phy_id: where to store the ID retrieved.
* @c45_ids: where to store the c45 ID information.
*
* If the PHY devices-in-package appears to be valid, it and the
* corresponding identifiers are stored in @c45_ids, zero is stored
* in @phy_id. Otherwise 0xffffffff is stored in @phy_id. Returns
* zero on success.
*
*/
static int get_phy_c45_ids(struct mii_bus *bus, int addr, u32 *phy_id,
struct phy_c45_device_ids *c45_ids) {
int phy_reg;
int i, reg_addr;
const int num_ids = ARRAY_SIZE(c45_ids->device_ids);
u32 *devs = &c45_ids->devices_in_package;
/* 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 < num_ids && *devs == 0; i++) {
phy_reg = get_phy_c45_devs_in_pkg(bus, addr, i, devs);
if (phy_reg < 0)
return -EIO;
if ((*devs & 0x1fffffff) == 0x1fffffff) {
/* If mostly Fs, there is no device there,
* then let's continue to probe more, 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);
if (phy_reg < 0)
return -EIO;
/* no device there, let's get out of here */
if ((*devs & 0x1fffffff) == 0x1fffffff) {
*phy_id = 0xffffffff;
return 0;
} else {
break;
}
}
}
/* Now probe Device Identifiers for each device present. */
for (i = 1; i < num_ids; i++) {
if (!(c45_ids->devices_in_package & (1 << i)))
continue;
reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID1;
phy_reg = mdiobus_read(bus, addr, reg_addr);
if (phy_reg < 0)
return -EIO;
c45_ids->device_ids[i] = (phy_reg & 0xffff) << 16;
reg_addr = MII_ADDR_C45 | i << 16 | MII_PHYSID2;
phy_reg = mdiobus_read(bus, addr, reg_addr);
if (phy_reg < 0)
return -EIO;
c45_ids->device_ids[i] |= (phy_reg & 0xffff);
}
*phy_id = 0;
return 0;
}
/**
* get_phy_id - reads the specified addr for its ID.
* @bus: the target MII bus
* @addr: PHY address on the MII bus
* @phy_id: where to store the ID retrieved.
* @is_c45: If true the PHY uses the 802.3 clause 45 protocol
* @c45_ids: where to store the c45 ID information.
*
* Description: In the case of a 802.3-c22 PHY, reads the ID registers
* of the PHY at @addr on the @bus, stores it in @phy_id and returns
* zero on success.
*
* In the case of a 802.3-c45 PHY, get_phy_c45_ids() is invoked, and
* its return value is in turn returned.
*
*/
static int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id,
bool is_c45, struct phy_c45_device_ids *c45_ids)
{
int phy_reg;
if (is_c45)
return get_phy_c45_ids(bus, addr, phy_id, c45_ids);
/* Grab the bits from PHYIR1, and put them in the upper half */
phy_reg = mdiobus_read(bus, addr, MII_PHYSID1);
if (phy_reg < 0) {
/* if there is no device, return without an error so scanning
* the bus works properly
*/
if (phy_reg == -EIO || phy_reg == -ENODEV) {
*phy_id = 0xffffffff;
return 0;
}
return -EIO;
}
*phy_id = (phy_reg & 0xffff) << 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)
return -EIO;
*phy_id |= (phy_reg & 0xffff);
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
*
* Description: Reads the ID registers of the PHY at @addr on the
* @bus, then allocates and returns the phy_device to represent it.
*/
struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
{
struct phy_c45_device_ids c45_ids = {0};
u32 phy_id = 0;
int r;
r = get_phy_id(bus, addr, &phy_id, is_c45, &c45_ids);
if (r)
return ERR_PTR(r);
/* If the phy_id is mostly Fs, there is no device there */
if ((phy_id & 0x1fffffff) == 0x1fffffff)
return ERR_PTR(-ENODEV);
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)
{
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, bool do_carrier)
{
struct net_device *netdev = phydev->attached_dev;
if (do_carrier) {
if (up)
netif_carrier_on(netdev);
else
netif_carrier_off(netdev);
}
phydev->adjust_link(netdev);
}
/**
* 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;
rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface);
if (rc)
return rc;
phy_prepare_link(phydev, handler);
phy_start_machine(phydev);
if (phydev->irq > 0)
phy_start_interrupts(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 (phydev->irq > 0)
phy_stop_interrupts(phydev);
phy_stop_machine(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) */
unsigned int retries = 12;
int ret;
do {
msleep(50);
ret = phy_read(phydev, MII_BMCR);
if (ret < 0)
return ret;
} while (ret & BMCR_RESET && --retries);
if (ret & BMCR_RESET)
return -ETIMEDOUT;
/* 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 || !phydev->drv->config_init)
return 0;
if (phydev->drv->soft_reset)
ret = phydev->drv->soft_reset(phydev);
if (ret < 0)
return ret;
ret = phy_scan_fixups(phydev);
if (ret < 0)
return ret;
return phydev->drv->config_init(phydev);
}
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)"
void phy_attached_print(struct phy_device *phydev, const char *fmt, ...)
{
net: phy: Deal with unbound PHY driver in phy_attached_print() Priit reported that stmmac was crashing with the trace below. This is because phy_attached_print() is called too early right after the PHY device has been found, but before it has a driver attached, since that is only done in phy_probe() which occurs later. Fix this by dealing with a possibly NULL phydev->drv point since that can happen here, but could also happen if we voluntarily did an unbind of the PHY device with the PHY driver. sun7i-dwmac 1c50000.ethernet: PTP uses main clock sun7i-dwmac 1c50000.ethernet: no reset control found sun7i-dwmac 1c50000.ethernet: no regulator found sun7i-dwmac 1c50000.ethernet: Ring mode enabled sun7i-dwmac 1c50000.ethernet: DMA HW capability register supported sun7i-dwmac 1c50000.ethernet: Normal descriptors libphy: stmmac: probed Unable to handle kernel NULL pointer dereference at virtual address 00000048 pgd = c0004000 [00000048] *pgd=00000000 Internal error: Oops: 5 [#1] SMP ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc6-00318-g0065bd7fa384 #1 Hardware name: Allwinner sun7i (A20) Family task: ee868000 task.stack: ee85c000 PC is at phy_attached_print+0x1c/0x8c LR is at stmmac_mdio_register+0x12c/0x200 pc : [<c04510ac>] lr : [<c045e6b4>] psr: 60000013 sp : ee85ddc8 ip : 00000000 fp : c07dfb5c r10: ee981210 r9 : 00000001 r8 : eea73000 r7 : eeaa6dd0 r6 : eeb49800 r5 : 00000000 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : eeb49800 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 10c5387d Table: 4000406a DAC: 00000051 Process swapper/0 (pid: 1, stack limit = 0xee85c210) Stack: (0xee85ddc8 to 0xee85e000) ddc0: 00000000 00000002 eeb49400 eea72000 00000000 eeb49400 dde0: c045e6b4 00000000 ffffffff eeab0810 00000000 c08051f8 ee9292c0 c016d480 de00: eea725c0 eea73000 eea72000 00000001 eea726c0 c0457d0c 00000040 00000020 de20: 00000000 c045b850 00000001 00000000 ee981200 eeab0810 eeaa6ed0 ee981210 de40: 00000000 c094a4a0 00000000 c0465180 eeaa7550 f08d0000 c9ffb90c 00000032 de60: fffffffa 00000032 ee981210 ffffffed c0a46620 fffffdfb c0a46620 c03f7be8 de80: ee981210 c0a9a388 00000000 00000000 c0a46620 c03f63e0 ee981210 c0a46620 dea0: ee981244 00000000 00000007 000000c6 c094a4a0 c03f6534 00000000 c0a46620 dec0: c03f6490 c03f49ec ee828a58 ee9217b4 c0a46620 eeaa4b00 c0a43230 c03f59fc dee0: c08051f8 c094a49c c0a46620 c0a46620 00000000 c091c668 c093783c c03f6dfc df00: ffffe000 00000000 c091c668 c010177c eefe0938 eefe0935 c085e200 000000c6 df20: 00000005 c0136bc8 60000013 c080b3a4 00000006 00000006 c07ce7b4 00000000 df40: c07d7ddc c07cef28 eefe0938 eefe093e c0a0b2f0 c0a641c0 c0a641c0 c0a641c0 df60: c0937834 00000007 000000c6 c094a4a0 00000000 c0900d88 00000006 00000006 df80: 00000000 c09005a8 00000000 c060ecf4 00000000 00000000 00000000 00000000 dfa0: 00000000 c060ecfc 00000000 c0107738 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffdeffff ffffffff [<c04510ac>] (phy_attached_print) from [<c045e6b4>] (stmmac_mdio_register+0x12c/0x200) [<c045e6b4>] (stmmac_mdio_register) from [<c045b850>] (stmmac_dvr_probe+0x850/0x96c) [<c045b850>] (stmmac_dvr_probe) from [<c0465180>] (sun7i_gmac_probe+0x120/0x180) [<c0465180>] (sun7i_gmac_probe) from [<c03f7be8>] (platform_drv_probe+0x50/0xac) [<c03f7be8>] (platform_drv_probe) from [<c03f63e0>] (driver_probe_device+0x234/0x2e4) [<c03f63e0>] (driver_probe_device) from [<c03f6534>] (__driver_attach+0xa4/0xa8) [<c03f6534>] (__driver_attach) from [<c03f49ec>] (bus_for_each_dev+0x4c/0x9c) [<c03f49ec>] (bus_for_each_dev) from [<c03f59fc>] (bus_add_driver+0x190/0x214) [<c03f59fc>] (bus_add_driver) from [<c03f6dfc>] (driver_register+0x78/0xf4) [<c03f6dfc>] (driver_register) from [<c010177c>] (do_one_initcall+0x44/0x168) [<c010177c>] (do_one_initcall) from [<c0900d88>] (kernel_init_freeable+0x144/0x1d0) [<c0900d88>] (kernel_init_freeable) from [<c060ecfc>] (kernel_init+0x8/0x110) [<c060ecfc>] (kernel_init) from [<c0107738>] (ret_from_fork+0x14/0x3c) Code: e59021c8 e59d401c e590302c e3540000 (e5922048) ---[ end trace 39ae87c7923562d0 ]--- Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Tested-By: Priit Laes <plaes@plaes.org> Fixes: fbca164776e4 ("net: stmmac: Use the right logging function in stmmac_mdio_register") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-23 05:26:47 +08:00
const char *drv_name = phydev->drv ? phydev->drv->name : "unbound";
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;
}
net: phy: Deal with unbound PHY driver in phy_attached_print() Priit reported that stmmac was crashing with the trace below. This is because phy_attached_print() is called too early right after the PHY device has been found, but before it has a driver attached, since that is only done in phy_probe() which occurs later. Fix this by dealing with a possibly NULL phydev->drv point since that can happen here, but could also happen if we voluntarily did an unbind of the PHY device with the PHY driver. sun7i-dwmac 1c50000.ethernet: PTP uses main clock sun7i-dwmac 1c50000.ethernet: no reset control found sun7i-dwmac 1c50000.ethernet: no regulator found sun7i-dwmac 1c50000.ethernet: Ring mode enabled sun7i-dwmac 1c50000.ethernet: DMA HW capability register supported sun7i-dwmac 1c50000.ethernet: Normal descriptors libphy: stmmac: probed Unable to handle kernel NULL pointer dereference at virtual address 00000048 pgd = c0004000 [00000048] *pgd=00000000 Internal error: Oops: 5 [#1] SMP ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc6-00318-g0065bd7fa384 #1 Hardware name: Allwinner sun7i (A20) Family task: ee868000 task.stack: ee85c000 PC is at phy_attached_print+0x1c/0x8c LR is at stmmac_mdio_register+0x12c/0x200 pc : [<c04510ac>] lr : [<c045e6b4>] psr: 60000013 sp : ee85ddc8 ip : 00000000 fp : c07dfb5c r10: ee981210 r9 : 00000001 r8 : eea73000 r7 : eeaa6dd0 r6 : eeb49800 r5 : 00000000 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : eeb49800 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 10c5387d Table: 4000406a DAC: 00000051 Process swapper/0 (pid: 1, stack limit = 0xee85c210) Stack: (0xee85ddc8 to 0xee85e000) ddc0: 00000000 00000002 eeb49400 eea72000 00000000 eeb49400 dde0: c045e6b4 00000000 ffffffff eeab0810 00000000 c08051f8 ee9292c0 c016d480 de00: eea725c0 eea73000 eea72000 00000001 eea726c0 c0457d0c 00000040 00000020 de20: 00000000 c045b850 00000001 00000000 ee981200 eeab0810 eeaa6ed0 ee981210 de40: 00000000 c094a4a0 00000000 c0465180 eeaa7550 f08d0000 c9ffb90c 00000032 de60: fffffffa 00000032 ee981210 ffffffed c0a46620 fffffdfb c0a46620 c03f7be8 de80: ee981210 c0a9a388 00000000 00000000 c0a46620 c03f63e0 ee981210 c0a46620 dea0: ee981244 00000000 00000007 000000c6 c094a4a0 c03f6534 00000000 c0a46620 dec0: c03f6490 c03f49ec ee828a58 ee9217b4 c0a46620 eeaa4b00 c0a43230 c03f59fc dee0: c08051f8 c094a49c c0a46620 c0a46620 00000000 c091c668 c093783c c03f6dfc df00: ffffe000 00000000 c091c668 c010177c eefe0938 eefe0935 c085e200 000000c6 df20: 00000005 c0136bc8 60000013 c080b3a4 00000006 00000006 c07ce7b4 00000000 df40: c07d7ddc c07cef28 eefe0938 eefe093e c0a0b2f0 c0a641c0 c0a641c0 c0a641c0 df60: c0937834 00000007 000000c6 c094a4a0 00000000 c0900d88 00000006 00000006 df80: 00000000 c09005a8 00000000 c060ecf4 00000000 00000000 00000000 00000000 dfa0: 00000000 c060ecfc 00000000 c0107738 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffdeffff ffffffff [<c04510ac>] (phy_attached_print) from [<c045e6b4>] (stmmac_mdio_register+0x12c/0x200) [<c045e6b4>] (stmmac_mdio_register) from [<c045b850>] (stmmac_dvr_probe+0x850/0x96c) [<c045b850>] (stmmac_dvr_probe) from [<c0465180>] (sun7i_gmac_probe+0x120/0x180) [<c0465180>] (sun7i_gmac_probe) from [<c03f7be8>] (platform_drv_probe+0x50/0xac) [<c03f7be8>] (platform_drv_probe) from [<c03f63e0>] (driver_probe_device+0x234/0x2e4) [<c03f63e0>] (driver_probe_device) from [<c03f6534>] (__driver_attach+0xa4/0xa8) [<c03f6534>] (__driver_attach) from [<c03f49ec>] (bus_for_each_dev+0x4c/0x9c) [<c03f49ec>] (bus_for_each_dev) from [<c03f59fc>] (bus_add_driver+0x190/0x214) [<c03f59fc>] (bus_add_driver) from [<c03f6dfc>] (driver_register+0x78/0xf4) [<c03f6dfc>] (driver_register) from [<c010177c>] (do_one_initcall+0x44/0x168) [<c010177c>] (do_one_initcall) from [<c0900d88>] (kernel_init_freeable+0x144/0x1d0) [<c0900d88>] (kernel_init_freeable) from [<c060ecfc>] (kernel_init+0x8/0x110) [<c060ecfc>] (kernel_init) from [<c0107738>] (ret_from_fork+0x14/0x3c) Code: e59021c8 e59d401c e590302c e3540000 (e5922048) ---[ end trace 39ae87c7923562d0 ]--- Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Tested-By: Priit Laes <plaes@plaes.org> Fixes: fbca164776e4 ("net: stmmac: Use the right logging function in stmmac_mdio_register") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-23 05:26:47 +08:00
if (!fmt) {
phydev_info(phydev, ATTACHED_FMT "\n",
net: phy: Deal with unbound PHY driver in phy_attached_print() Priit reported that stmmac was crashing with the trace below. This is because phy_attached_print() is called too early right after the PHY device has been found, but before it has a driver attached, since that is only done in phy_probe() which occurs later. Fix this by dealing with a possibly NULL phydev->drv point since that can happen here, but could also happen if we voluntarily did an unbind of the PHY device with the PHY driver. sun7i-dwmac 1c50000.ethernet: PTP uses main clock sun7i-dwmac 1c50000.ethernet: no reset control found sun7i-dwmac 1c50000.ethernet: no regulator found sun7i-dwmac 1c50000.ethernet: Ring mode enabled sun7i-dwmac 1c50000.ethernet: DMA HW capability register supported sun7i-dwmac 1c50000.ethernet: Normal descriptors libphy: stmmac: probed Unable to handle kernel NULL pointer dereference at virtual address 00000048 pgd = c0004000 [00000048] *pgd=00000000 Internal error: Oops: 5 [#1] SMP ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc6-00318-g0065bd7fa384 #1 Hardware name: Allwinner sun7i (A20) Family task: ee868000 task.stack: ee85c000 PC is at phy_attached_print+0x1c/0x8c LR is at stmmac_mdio_register+0x12c/0x200 pc : [<c04510ac>] lr : [<c045e6b4>] psr: 60000013 sp : ee85ddc8 ip : 00000000 fp : c07dfb5c r10: ee981210 r9 : 00000001 r8 : eea73000 r7 : eeaa6dd0 r6 : eeb49800 r5 : 00000000 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : eeb49800 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 10c5387d Table: 4000406a DAC: 00000051 Process swapper/0 (pid: 1, stack limit = 0xee85c210) Stack: (0xee85ddc8 to 0xee85e000) ddc0: 00000000 00000002 eeb49400 eea72000 00000000 eeb49400 dde0: c045e6b4 00000000 ffffffff eeab0810 00000000 c08051f8 ee9292c0 c016d480 de00: eea725c0 eea73000 eea72000 00000001 eea726c0 c0457d0c 00000040 00000020 de20: 00000000 c045b850 00000001 00000000 ee981200 eeab0810 eeaa6ed0 ee981210 de40: 00000000 c094a4a0 00000000 c0465180 eeaa7550 f08d0000 c9ffb90c 00000032 de60: fffffffa 00000032 ee981210 ffffffed c0a46620 fffffdfb c0a46620 c03f7be8 de80: ee981210 c0a9a388 00000000 00000000 c0a46620 c03f63e0 ee981210 c0a46620 dea0: ee981244 00000000 00000007 000000c6 c094a4a0 c03f6534 00000000 c0a46620 dec0: c03f6490 c03f49ec ee828a58 ee9217b4 c0a46620 eeaa4b00 c0a43230 c03f59fc dee0: c08051f8 c094a49c c0a46620 c0a46620 00000000 c091c668 c093783c c03f6dfc df00: ffffe000 00000000 c091c668 c010177c eefe0938 eefe0935 c085e200 000000c6 df20: 00000005 c0136bc8 60000013 c080b3a4 00000006 00000006 c07ce7b4 00000000 df40: c07d7ddc c07cef28 eefe0938 eefe093e c0a0b2f0 c0a641c0 c0a641c0 c0a641c0 df60: c0937834 00000007 000000c6 c094a4a0 00000000 c0900d88 00000006 00000006 df80: 00000000 c09005a8 00000000 c060ecf4 00000000 00000000 00000000 00000000 dfa0: 00000000 c060ecfc 00000000 c0107738 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffdeffff ffffffff [<c04510ac>] (phy_attached_print) from [<c045e6b4>] (stmmac_mdio_register+0x12c/0x200) [<c045e6b4>] (stmmac_mdio_register) from [<c045b850>] (stmmac_dvr_probe+0x850/0x96c) [<c045b850>] (stmmac_dvr_probe) from [<c0465180>] (sun7i_gmac_probe+0x120/0x180) [<c0465180>] (sun7i_gmac_probe) from [<c03f7be8>] (platform_drv_probe+0x50/0xac) [<c03f7be8>] (platform_drv_probe) from [<c03f63e0>] (driver_probe_device+0x234/0x2e4) [<c03f63e0>] (driver_probe_device) from [<c03f6534>] (__driver_attach+0xa4/0xa8) [<c03f6534>] (__driver_attach) from [<c03f49ec>] (bus_for_each_dev+0x4c/0x9c) [<c03f49ec>] (bus_for_each_dev) from [<c03f59fc>] (bus_add_driver+0x190/0x214) [<c03f59fc>] (bus_add_driver) from [<c03f6dfc>] (driver_register+0x78/0xf4) [<c03f6dfc>] (driver_register) from [<c010177c>] (do_one_initcall+0x44/0x168) [<c010177c>] (do_one_initcall) from [<c0900d88>] (kernel_init_freeable+0x144/0x1d0) [<c0900d88>] (kernel_init_freeable) from [<c060ecfc>] (kernel_init+0x8/0x110) [<c060ecfc>] (kernel_init) from [<c0107738>] (ret_from_fork+0x14/0x3c) Code: e59021c8 e59d401c e590302c e3540000 (e5922048) ---[ end trace 39ae87c7923562d0 ]--- Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Tested-By: Priit Laes <plaes@plaes.org> Fixes: fbca164776e4 ("net: stmmac: Use the right logging function in stmmac_mdio_register") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-23 05:26:47 +08:00
drv_name, phydev_name(phydev),
irq_str);
} else {
va_list ap;
phydev_info(phydev, ATTACHED_FMT,
net: phy: Deal with unbound PHY driver in phy_attached_print() Priit reported that stmmac was crashing with the trace below. This is because phy_attached_print() is called too early right after the PHY device has been found, but before it has a driver attached, since that is only done in phy_probe() which occurs later. Fix this by dealing with a possibly NULL phydev->drv point since that can happen here, but could also happen if we voluntarily did an unbind of the PHY device with the PHY driver. sun7i-dwmac 1c50000.ethernet: PTP uses main clock sun7i-dwmac 1c50000.ethernet: no reset control found sun7i-dwmac 1c50000.ethernet: no regulator found sun7i-dwmac 1c50000.ethernet: Ring mode enabled sun7i-dwmac 1c50000.ethernet: DMA HW capability register supported sun7i-dwmac 1c50000.ethernet: Normal descriptors libphy: stmmac: probed Unable to handle kernel NULL pointer dereference at virtual address 00000048 pgd = c0004000 [00000048] *pgd=00000000 Internal error: Oops: 5 [#1] SMP ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc6-00318-g0065bd7fa384 #1 Hardware name: Allwinner sun7i (A20) Family task: ee868000 task.stack: ee85c000 PC is at phy_attached_print+0x1c/0x8c LR is at stmmac_mdio_register+0x12c/0x200 pc : [<c04510ac>] lr : [<c045e6b4>] psr: 60000013 sp : ee85ddc8 ip : 00000000 fp : c07dfb5c r10: ee981210 r9 : 00000001 r8 : eea73000 r7 : eeaa6dd0 r6 : eeb49800 r5 : 00000000 r4 : 00000000 r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : eeb49800 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 10c5387d Table: 4000406a DAC: 00000051 Process swapper/0 (pid: 1, stack limit = 0xee85c210) Stack: (0xee85ddc8 to 0xee85e000) ddc0: 00000000 00000002 eeb49400 eea72000 00000000 eeb49400 dde0: c045e6b4 00000000 ffffffff eeab0810 00000000 c08051f8 ee9292c0 c016d480 de00: eea725c0 eea73000 eea72000 00000001 eea726c0 c0457d0c 00000040 00000020 de20: 00000000 c045b850 00000001 00000000 ee981200 eeab0810 eeaa6ed0 ee981210 de40: 00000000 c094a4a0 00000000 c0465180 eeaa7550 f08d0000 c9ffb90c 00000032 de60: fffffffa 00000032 ee981210 ffffffed c0a46620 fffffdfb c0a46620 c03f7be8 de80: ee981210 c0a9a388 00000000 00000000 c0a46620 c03f63e0 ee981210 c0a46620 dea0: ee981244 00000000 00000007 000000c6 c094a4a0 c03f6534 00000000 c0a46620 dec0: c03f6490 c03f49ec ee828a58 ee9217b4 c0a46620 eeaa4b00 c0a43230 c03f59fc dee0: c08051f8 c094a49c c0a46620 c0a46620 00000000 c091c668 c093783c c03f6dfc df00: ffffe000 00000000 c091c668 c010177c eefe0938 eefe0935 c085e200 000000c6 df20: 00000005 c0136bc8 60000013 c080b3a4 00000006 00000006 c07ce7b4 00000000 df40: c07d7ddc c07cef28 eefe0938 eefe093e c0a0b2f0 c0a641c0 c0a641c0 c0a641c0 df60: c0937834 00000007 000000c6 c094a4a0 00000000 c0900d88 00000006 00000006 df80: 00000000 c09005a8 00000000 c060ecf4 00000000 00000000 00000000 00000000 dfa0: 00000000 c060ecfc 00000000 c0107738 00000000 00000000 00000000 00000000 dfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffdeffff ffffffff [<c04510ac>] (phy_attached_print) from [<c045e6b4>] (stmmac_mdio_register+0x12c/0x200) [<c045e6b4>] (stmmac_mdio_register) from [<c045b850>] (stmmac_dvr_probe+0x850/0x96c) [<c045b850>] (stmmac_dvr_probe) from [<c0465180>] (sun7i_gmac_probe+0x120/0x180) [<c0465180>] (sun7i_gmac_probe) from [<c03f7be8>] (platform_drv_probe+0x50/0xac) [<c03f7be8>] (platform_drv_probe) from [<c03f63e0>] (driver_probe_device+0x234/0x2e4) [<c03f63e0>] (driver_probe_device) from [<c03f6534>] (__driver_attach+0xa4/0xa8) [<c03f6534>] (__driver_attach) from [<c03f49ec>] (bus_for_each_dev+0x4c/0x9c) [<c03f49ec>] (bus_for_each_dev) from [<c03f59fc>] (bus_add_driver+0x190/0x214) [<c03f59fc>] (bus_add_driver) from [<c03f6dfc>] (driver_register+0x78/0xf4) [<c03f6dfc>] (driver_register) from [<c010177c>] (do_one_initcall+0x44/0x168) [<c010177c>] (do_one_initcall) from [<c0900d88>] (kernel_init_freeable+0x144/0x1d0) [<c0900d88>] (kernel_init_freeable) from [<c060ecfc>] (kernel_init+0x8/0x110) [<c060ecfc>] (kernel_init) from [<c0107738>] (ret_from_fork+0x14/0x3c) Code: e59021c8 e59d401c e590302c e3540000 (e5922048) ---[ end trace 39ae87c7923562d0 ]--- Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Tested-By: Priit Laes <plaes@plaes.org> Fixes: fbca164776e4 ("net: stmmac: Use the right logging function in stmmac_mdio_register") Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-23 05:26:47 +08:00
drv_name, phydev_name(phydev),
irq_str);
va_start(ap, fmt);
vprintk(fmt, ap);
va_end(ap);
}
}
EXPORT_SYMBOL(phy_attached_print);
/**
* 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 module *ndev_owner = dev->dev.parent->driver->owner;
struct mii_bus *bus = phydev->mdio.bus;
struct device *d = &phydev->mdio.dev;
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 (ndev_owner != bus->owner && !try_module_get(bus->owner)) {
dev_err(&dev->dev, "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_10g_driver.mdiodrv.driver;
else
d->driver = &genphy_driver.mdiodrv.driver;
using_genphy = true;
}
if (!try_module_get(d->driver->owner)) {
dev_err(&dev->dev, "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;
phydev->attached_dev = dev;
dev->phydev = phydev;
/* 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;
err = sysfs_create_link(&phydev->mdio.dev.kobj, &dev->dev.kobj,
"attached_dev");
if (!err) {
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;
}
phydev->dev_flags = flags;
phydev->interface = interface;
phylib: Fix race between returning phydev and calling adjust_link It is possible that phylib will call adjust_link before returning from {,of_}phy_connect(), which may cause the following [very rare, though] oops upon reopening the device: Unable to handle kernel paging request for data at address 0x0000024c Oops: Kernel access of bad area, sig: 11 [#1] PREEMPT SMP NR_CPUS=2 LTT NESTING LEVEL : 0 P1021 RDB Modules linked in: NIP: c0345dac LR: c0345dac CTR: c0345d84 TASK = dffab6b0[30] 'events/0' THREAD: c0d24000 CPU: 0 [...] NIP [c0345dac] adjust_link+0x28/0x19c LR [c0345dac] adjust_link+0x28/0x19c Call Trace: [c0d25f00] [000045e1] 0x45e1 (unreliable) [c0d25f30] [c036c158] phy_state_machine+0x3ac/0x554 [...] Here is why. Drivers store phydev in their private structures, e.g. gianfar driver: static int init_phy(struct net_device *dev) { ... priv->phydev = of_phy_connect(...); ... } So that adjust_link could retrieve it back: static void adjust_link(struct net_device *dev) { ... struct phy_device *phydev = priv->phydev; ... } If the device has been opened before, then phydev->state is set to PHY_HALTED (or undefined if the driver didn't call phy_stop()). Now, phy_connect starts the PHY state machine before returning phydev to the driver: phy_start_machine(phydev, NULL); if (phydev->irq > 0) phy_start_interrupts(phydev); return phydev; The time between 'phy_start_machine()' and 'return phydev' is undefined. The start machine routine delays execution for 1 second, which is enough for most cases. But under heavy load, or if you're unlucky, it is quite possible that PHY state machine will execute before phy_connect() returns, and so adjust_link callback will try to dereference phydev, which is not yet ready. To fix the issue, simply initialize the PHY's state to PHY_READY during phy_attach(). This will ensure that phylib won't call adjust_link before phy_start(). Signed-off-by: Anton Vorontsov <avorontsov@mvista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-08-25 05:46:12 +08:00
phydev->state = PHY_READY;
/* Initial carrier state is off as the phy is about to be
* (re)initialized.
*/
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;
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:
net: phy: Fix lack of reference count on PHY driver There is currently no reference count being held on the PHY driver, which makes it possible to remove the PHY driver module while the PHY state machine is running and polling the PHY. This could cause crashes similar to this one to show up: [ 43.361162] BUG: unable to handle kernel NULL pointer dereference at 0000000000000140 [ 43.361162] IP: phy_state_machine+0x32/0x490 [ 43.361162] PGD 59dc067 [ 43.361162] PUD 0 [ 43.361162] [ 43.361162] Oops: 0000 [#1] SMP [ 43.361162] Modules linked in: dsa_loop [last unloaded: broadcom] [ 43.361162] CPU: 0 PID: 1299 Comm: kworker/0:3 Not tainted 4.10.0-rc5+ #415 [ 43.361162] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu2 04/01/2014 [ 43.361162] Workqueue: events_power_efficient phy_state_machine [ 43.361162] task: ffff880006782b80 task.stack: ffffc90000184000 [ 43.361162] RIP: 0010:phy_state_machine+0x32/0x490 [ 43.361162] RSP: 0018:ffffc90000187e18 EFLAGS: 00000246 [ 43.361162] RAX: 0000000000000000 RBX: ffff8800059e53c0 RCX: ffff880006a15c60 [ 43.361162] RDX: ffff880006782b80 RSI: 0000000000000000 RDI: ffff8800059e5428 [ 43.361162] RBP: ffffc90000187e48 R08: ffff880006a15c40 R09: 0000000000000000 [ 43.361162] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800059e5428 [ 43.361162] R13: ffff8800059e5000 R14: 0000000000000000 R15: ffff880006a15c40 [ 43.361162] FS: 0000000000000000(0000) GS:ffff880006a00000(0000) knlGS:0000000000000000 [ 43.361162] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.361162] CR2: 0000000000000140 CR3: 0000000005979000 CR4: 00000000000006f0 [ 43.361162] Call Trace: [ 43.361162] process_one_work+0x1b4/0x3e0 [ 43.361162] worker_thread+0x43/0x4d0 [ 43.361162] ? __schedule+0x17f/0x4e0 [ 43.361162] kthread+0xf7/0x130 [ 43.361162] ? process_one_work+0x3e0/0x3e0 [ 43.361162] ? kthread_create_on_node+0x40/0x40 [ 43.361162] ret_from_fork+0x29/0x40 [ 43.361162] Code: 56 41 55 41 54 4c 8d 67 68 53 4c 8d af 40 fc ff ff 48 89 fb 4c 89 e7 48 83 ec 08 e8 c9 9d 27 00 48 8b 83 60 ff ff ff 44 8b 73 98 <48> 8b 90 40 01 00 00 44 89 f0 48 85 d2 74 08 4c 89 ef ff d2 8b Keep references on the PHY driver module right before we are going to utilize it in phy_attach_direct(), and conversely when we don't use it anymore in phy_detach(). Signed-off-by: Mao Wenan <maowenan@huawei.com> [florian: rebase, rework commit message] Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-02-01 10:46:43 +08:00
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;
/* 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);
/**
* 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 = dev->dev.parent->driver->owner;
struct mii_bus *bus;
if (phydev->sysfs_links) {
sysfs_remove_link(&dev->dev.kobj, "phydev");
sysfs_remove_link(&phydev->mdio.dev.kobj, "attached_dev");
}
phy_suspend(phydev);
phydev->attached_dev->phydev = NULL;
phydev->attached_dev = NULL;
phylink: add phylink infrastructure The link between the ethernet MAC and its PHY has become more complex as the interface evolves. This is especially true with serdes links, where the part of the PHY is effectively integrated into the MAC. Serdes links can be connected to a variety of devices, including SFF modules soldered down onto the board with the MAC, a SFP cage with a hotpluggable SFP module which may contain a PHY or directly modulate the serdes signals onto optical media with or without a PHY, or even a classical PHY connection. Moreover, the negotiation information on serdes links comes in two varieties - SGMII mode, where the PHY provides its speed/duplex/flow control information to the MAC, and 1000base-X mode where both ends exchange their abilities and each resolve the link capabilities. This means we need a more flexible means to support these arrangements, particularly with the hotpluggable nature of SFP, where the PHY can be attached or detached after the network device has been brought up. Ethtool information can come from multiple sources: - we may have a PHY operating in either SGMII or 1000base-X mode, in which case we take ethtool/mii data directly from the PHY. - we may have a optical SFP module without a PHY, with the MAC operating in 1000base-X mode - the ethtool/mii data needs to come from the MAC. - we may have a copper SFP module with a PHY whic can't be accessed, which means we need to take ethtool/mii data from the MAC. Phylink aims to solve this by providing an intermediary between the MAC and PHY, providing a safe way for PHYs to be hotplugged, and allowing a SFP driver to reconfigure the serdes connection. Phylink also takes over support of fixed link connections, where the speed/duplex/flow control are fixed, but link status may be controlled by a GPIO signal. By avoiding the fixed-phy implementation, phylink can provide a faster response to link events: fixed-phy has to wait for phylib to operate its state machine, which can take several seconds. In comparison, phylink takes milliseconds. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> - remove sync status - rework supported and advertisment handling - add 1000base-x speed for fixed links - use functionality exported from phy-core, reworking __phylink_ethtool_ksettings_set for it Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
2017-07-25 22:03:13 +08:00
phydev->phylink = NULL;
phy_led_triggers_unregister(phydev);
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 (phydev->mdio.dev.driver == &genphy_10g_driver.mdiodrv.driver ||
phydev->mdio.dev.driver == &genphy_driver.mdiodrv.driver)
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 (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 phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
struct net_device *netdev = phydev->attached_dev;
struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
int ret = 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 (phydev->drv && phydrv->suspend)
ret = phydrv->suspend(phydev);
if (ret)
return ret;
phydev->suspended = true;
return ret;
}
EXPORT_SYMBOL(phy_suspend);
int __phy_resume(struct phy_device *phydev)
{
struct phy_driver *phydrv = to_phy_driver(phydev->mdio.dev.driver);
int ret = 0;
WARN_ON(!mutex_is_locked(&phydev->lock));
if (phydev->drv && phydrv->resume)
ret = phydrv->resume(phydev);
if (ret)
return 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)
{
u32 advertise;
int oldadv, adv, bmsr;
int err, changed = 0;
/* Only allow advertising what this PHY supports */
linkmode_and(phydev->advertising, phydev->advertising,
phydev->supported);
if (!ethtool_convert_link_mode_to_legacy_u32(&advertise,
phydev->advertising))
phydev_warn(phydev, "PHY advertising (%*pb) more modes than genphy supports, some modes not advertised.\n",
__ETHTOOL_LINK_MODE_MASK_NBITS,
phydev->advertising);
/* Setup standard advertisement */
adv = phy_read(phydev, MII_ADVERTISE);
if (adv < 0)
return adv;
oldadv = adv;
adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP |
ADVERTISE_PAUSE_ASYM);
adv |= ethtool_adv_to_mii_adv_t(advertise);
if (adv != oldadv) {
err = phy_write(phydev, MII_ADVERTISE, adv);
if (err < 0)
return err;
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;
/* Configure gigabit if it's supported */
adv = phy_read(phydev, MII_CTRL1000);
if (adv < 0)
return adv;
oldadv = adv;
adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF);
if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
phydev->supported) ||
linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
phydev->supported))
adv |= ethtool_adv_to_mii_ctrl1000_t(advertise);
if (adv != oldadv)
changed = 1;
err = phy_write(phydev, MII_CTRL1000, adv);
if (err < 0)
return err;
return changed;
}
/**
* 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.
*/
static int genphy_config_eee_advert(struct phy_device *phydev)
{
int broken = phydev->eee_broken_modes;
int old_adv, adv;
/* Nothing to disable */
if (!broken)
return 0;
/* If the following call fails, we assume that EEE is not
* supported by the phy. If we read 0, EEE is not advertised
* In both case, we don't need to continue
*/
adv = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV);
if (adv <= 0)
return 0;
old_adv = adv;
adv &= ~broken;
/* Advertising remains unchanged with the broken mask */
if (old_adv == adv)
return 0;
phy_write_mmd(phydev, MDIO_MMD_AN, MDIO_AN_EEE_ADV, adv);
return 1;
}
/**
* 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);
/**
* 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_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.
*/
int genphy_config_aneg(struct phy_device *phydev)
{
int err, changed;
changed = genphy_config_eee_advert(phydev);
if (AUTONEG_ENABLE != phydev->autoneg)
return genphy_setup_forced(phydev);
err = genphy_config_advert(phydev);
if (err < 0) /* error */
return err;
changed |= err;
if (changed == 0) {
/* 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_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;
/* Do a fake read */
status = phy_read(phydev, MII_BMSR);
if (status < 0)
return status;
/* Read link and autonegotiation status */
status = phy_read(phydev, MII_BMSR);
if (status < 0)
return status;
if ((status & BMSR_LSTATUS) == 0)
phydev->link = 0;
else
phydev->link = 1;
return 0;
}
EXPORT_SYMBOL(genphy_update_link);
/**
* 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 adv;
int err;
int lpa;
int lpagb = 0;
int common_adv;
int common_adv_gb = 0;
/* Update the link, but return if there was an error */
err = genphy_update_link(phydev);
if (err)
return err;
linkmode_zero(phydev->lp_advertising);
if (AUTONEG_ENABLE == phydev->autoneg) {
if (linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
phydev->supported) ||
linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
phydev->supported)) {
lpagb = phy_read(phydev, MII_STAT1000);
if (lpagb < 0)
return lpagb;
adv = phy_read(phydev, MII_CTRL1000);
if (adv < 0)
return adv;
if (lpagb & LPA_1000MSFAIL) {
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);
common_adv_gb = lpagb & adv << 2;
}
lpa = phy_read(phydev, MII_LPA);
if (lpa < 0)
return lpa;
mii_lpa_mod_linkmode_lpa_t(phydev->lp_advertising, lpa);
adv = phy_read(phydev, MII_ADVERTISE);
if (adv < 0)
return adv;
common_adv = lpa & adv;
phydev->speed = SPEED_10;
phydev->duplex = DUPLEX_HALF;
phydev->pause = 0;
phydev->asym_pause = 0;
if (common_adv_gb & (LPA_1000FULL | LPA_1000HALF)) {
phydev->speed = SPEED_1000;
if (common_adv_gb & LPA_1000FULL)
phydev->duplex = DUPLEX_FULL;
} else if (common_adv & (LPA_100FULL | LPA_100HALF)) {
phydev->speed = SPEED_100;
if (common_adv & LPA_100FULL)
phydev->duplex = DUPLEX_FULL;
} else
if (common_adv & LPA_10FULL)
phydev->duplex = DUPLEX_FULL;
if (phydev->duplex == DUPLEX_FULL) {
phydev->pause = lpa & LPA_PAUSE_CAP ? 1 : 0;
phydev->asym_pause = lpa & LPA_PAUSE_ASYM ? 1 : 0;
}
} else {
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;
phydev->pause = 0;
phydev->asym_pause = 0;
}
return 0;
}
EXPORT_SYMBOL(genphy_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)
{
int ret;
ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
if (ret < 0)
return ret;
return phy_poll_reset(phydev);
}
EXPORT_SYMBOL(genphy_soft_reset);
int genphy_config_init(struct phy_device *phydev)
{
int val;
__ETHTOOL_DECLARE_LINK_MODE_MASK(features) = { 0, };
linkmode_set_bit_array(phy_basic_ports_array,
ARRAY_SIZE(phy_basic_ports_array),
features);
linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, features);
linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, features);
/* Do we support autonegotiation? */
val = phy_read(phydev, MII_BMSR);
if (val < 0)
return val;
if (val & BMSR_ANEGCAPABLE)
linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, features);
if (val & BMSR_100FULL)
linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, features);
if (val & BMSR_100HALF)
linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, features);
if (val & BMSR_10FULL)
linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, features);
if (val & BMSR_10HALF)
linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, features);
if (val & BMSR_ESTATEN) {
val = phy_read(phydev, MII_ESTATUS);
if (val < 0)
return val;
if (val & ESTATUS_1000_TFULL)
linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
features);
if (val & ESTATUS_1000_THALF)
linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
features);
}
linkmode_and(phydev->supported, phydev->supported, features);
linkmode_and(phydev->advertising, phydev->advertising, features);
return 0;
}
EXPORT_SYMBOL(genphy_config_init);
/* 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);
static int __set_phy_supported(struct phy_device *phydev, u32 max_speed)
{
switch (max_speed) {
case SPEED_10:
linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
phydev->supported);
linkmode_clear_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
phydev->supported);
/* fall through */
case SPEED_100:
linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
phydev->supported);
linkmode_clear_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
phydev->supported);
break;
case SPEED_1000:
break;
default:
return -ENOTSUPP;
}
return 0;
}
int phy_set_max_speed(struct phy_device *phydev, u32 max_speed)
{
int err;
err = __set_phy_supported(phydev, max_speed);
if (err)
return err;
linkmode_copy(phydev->advertising, phydev->supported);
return 0;
}
EXPORT_SYMBOL(phy_set_max_speed);
/**
* 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);
linkmode_copy(phydev->advertising, phydev->supported);
}
EXPORT_SYMBOL(phy_remove_link_mode);
/**
* 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);
linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported);
linkmode_copy(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)
{
linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported);
linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported);
linkmode_copy(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_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->advertising);
linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->advertising);
if (rx) {
linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->advertising);
linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->advertising);
}
if (tx)
linkmode_change_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->advertising);
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) ||
(!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);
static void of_set_phy_supported(struct phy_device *phydev)
{
struct device_node *node = phydev->mdio.dev.of_node;
u32 max_speed;
if (!IS_ENABLED(CONFIG_OF_MDIO))
return;
if (!node)
return;
if (!of_property_read_u32(node, "max-speed", &max_speed))
__set_phy_supported(phydev, max_speed);
}
static void of_set_phy_eee_broken(struct phy_device *phydev)
{
struct device_node *node = phydev->mdio.dev.of_node;
u32 broken = 0;
if (!IS_ENABLED(CONFIG_OF_MDIO))
return;
if (!node)
return;
if (of_property_read_bool(node, "eee-broken-100tx"))
broken |= MDIO_EEE_100TX;
if (of_property_read_bool(node, "eee-broken-1000t"))
broken |= MDIO_EEE_1000T;
if (of_property_read_bool(node, "eee-broken-10gt"))
broken |= MDIO_EEE_10GT;
if (of_property_read_bool(node, "eee-broken-1000kx"))
broken |= MDIO_EEE_1000KX;
if (of_property_read_bool(node, "eee-broken-10gkx4"))
broken |= MDIO_EEE_10GKX4;
if (of_property_read_bool(node, "eee-broken-10gkr"))
broken |= MDIO_EEE_10GKR;
phydev->eee_broken_modes = broken;
}
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);
/* Start out supporting everything. Eventually,
* a controller will attach, and may modify one
* or both of these values
*/
linkmode_copy(phydev->supported, phydrv->features);
of_set_phy_supported(phydev);
linkmode_copy(phydev->advertising, phydev->supported);
/* 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);
net: phy: phy drivers should not set SUPPORTED_[Asym_]Pause Instead of having individual PHY drivers set the SUPPORTED_Pause and SUPPORTED_Asym_Pause flags, phylib itself should set those flags, unless there is a hardware erratum or other special case. During autonegotiation, the PHYs will determine whether to enable pause frame support. Pause frames are a feature that is supported by the MAC. It is the MAC that generates the frames and that processes them. The PHY can only be configured to allow them to pass through. This commit also effectively reverts the recently applied c7a61319 ("net: phy: dp83848: Support ethernet pause frames"). So the new process is: 1) Unless the PHY driver overrides it, phylib sets the SUPPORTED_Pause and SUPPORTED_AsymPause bits in phydev->supported. This indicates that the PHY supports pause frames. 2) The MAC driver checks phydev->supported before it calls phy_start(). If (SUPPORTED_Pause | SUPPORTED_AsymPause) is set, then the MAC driver sets those bits in phydev->advertising, if it wants to enable pause frame support. 3) When the link state changes, the MAC driver checks phydev->pause and phydev->asym_pause, If the bits are set, then it enables the corresponding features in the MAC. The algorithm is: if (phydev->pause) The MAC should be programmed to receive and honor pause frames it receives, i.e. enable receive flow control. if (phydev->pause != phydev->asym_pause) The MAC should be programmed to transmit pause frames when needed, i.e. enable transmit flow control. Signed-off-by: Timur Tabi <timur@codeaurora.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-12-08 03:20:51 +08:00
/* 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, phydrv->features) ||
test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydrv->features)) {
linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->supported);
linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->supported);
if (test_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydrv->features))
linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->supported);
if (test_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydrv->features))
linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->supported);
net: phy: phy drivers should not set SUPPORTED_[Asym_]Pause Instead of having individual PHY drivers set the SUPPORTED_Pause and SUPPORTED_Asym_Pause flags, phylib itself should set those flags, unless there is a hardware erratum or other special case. During autonegotiation, the PHYs will determine whether to enable pause frame support. Pause frames are a feature that is supported by the MAC. It is the MAC that generates the frames and that processes them. The PHY can only be configured to allow them to pass through. This commit also effectively reverts the recently applied c7a61319 ("net: phy: dp83848: Support ethernet pause frames"). So the new process is: 1) Unless the PHY driver overrides it, phylib sets the SUPPORTED_Pause and SUPPORTED_AsymPause bits in phydev->supported. This indicates that the PHY supports pause frames. 2) The MAC driver checks phydev->supported before it calls phy_start(). If (SUPPORTED_Pause | SUPPORTED_AsymPause) is set, then the MAC driver sets those bits in phydev->advertising, if it wants to enable pause frame support. 3) When the link state changes, the MAC driver checks phydev->pause and phydev->asym_pause, If the bits are set, then it enables the corresponding features in the MAC. The algorithm is: if (phydev->pause) The MAC should be programmed to receive and honor pause frames it receives, i.e. enable receive flow control. if (phydev->pause != phydev->asym_pause) The MAC should be programmed to transmit pause frames when needed, i.e. enable transmit flow control. Signed-off-by: Timur Tabi <timur@codeaurora.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-12-08 03:20:51 +08:00
} else {
linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT,
phydev->supported);
linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
phydev->supported);
net: phy: phy drivers should not set SUPPORTED_[Asym_]Pause Instead of having individual PHY drivers set the SUPPORTED_Pause and SUPPORTED_Asym_Pause flags, phylib itself should set those flags, unless there is a hardware erratum or other special case. During autonegotiation, the PHYs will determine whether to enable pause frame support. Pause frames are a feature that is supported by the MAC. It is the MAC that generates the frames and that processes them. The PHY can only be configured to allow them to pass through. This commit also effectively reverts the recently applied c7a61319 ("net: phy: dp83848: Support ethernet pause frames"). So the new process is: 1) Unless the PHY driver overrides it, phylib sets the SUPPORTED_Pause and SUPPORTED_AsymPause bits in phydev->supported. This indicates that the PHY supports pause frames. 2) The MAC driver checks phydev->supported before it calls phy_start(). If (SUPPORTED_Pause | SUPPORTED_AsymPause) is set, then the MAC driver sets those bits in phydev->advertising, if it wants to enable pause frame support. 3) When the link state changes, the MAC driver checks phydev->pause and phydev->asym_pause, If the bits are set, then it enables the corresponding features in the MAC. The algorithm is: if (phydev->pause) The MAC should be programmed to receive and honor pause frames it receives, i.e. enable receive flow control. if (phydev->pause != phydev->asym_pause) The MAC should be programmed to transmit pause frames when needed, i.e. enable transmit flow control. Signed-off-by: Timur Tabi <timur@codeaurora.org> Signed-off-by: David S. Miller <davem@davemloft.net>
2016-12-08 03:20:51 +08:00
}
/* Set the state to READY by default */
phydev->state = PHY_READY;
if (phydev->drv->probe) {
/* Deassert the reset signal */
phy_device_reset(phydev, 0);
err = phydev->drv->probe(phydev);
if (err) {
/* Assert the reset signal */
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);
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;
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;
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",
.soft_reset = genphy_no_soft_reset,
.config_init = genphy_config_init,
.features = PHY_GBIT_ALL_PORTS_FEATURES,
.aneg_done = genphy_aneg_done,
.suspend = genphy_suspend,
.resume = genphy_resume,
.set_loopback = genphy_loopback,
};
static int __init phy_init(void)
{
int rc;
rc = mdio_bus_init();
if (rc)
return rc;
features_init();
rc = phy_driver_register(&genphy_10g_driver, THIS_MODULE);
if (rc)
goto err_10g;
rc = phy_driver_register(&genphy_driver, THIS_MODULE);
if (rc) {
phy_driver_unregister(&genphy_10g_driver);
err_10g:
mdio_bus_exit();
}
return rc;
}
static void __exit phy_exit(void)
{
phy_driver_unregister(&genphy_10g_driver);
phy_driver_unregister(&genphy_driver);
mdio_bus_exit();
}
subsys_initcall(phy_init);
module_exit(phy_exit);