- 根目录:
- drivers
- net
- phy
- phy_device.c
/* 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/phy.h>
#include <linux/mdio.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <asm/irq.h>
MODULE_DESCRIPTION("PHY library");
MODULE_AUTHOR("Andy Fleming");
MODULE_LICENSE("GPL");
void phy_device_free(struct phy_device *phydev)
{
put_device(&phydev->dev);
}
EXPORT_SYMBOL(phy_device_free);
static void phy_device_release(struct device *dev)
{
kfree(to_phy_device(dev));
}
enum genphy_driver {
GENPHY_DRV_1G,
GENPHY_DRV_10G,
GENPHY_DRV_MAX
};
static struct phy_driver genphy_driver[GENPHY_DRV_MAX];
static LIST_HEAD(phy_fixup_list);
static DEFINE_MUTEX(phy_fixup_lock);
/**
* phy_register_fixup - creates a new phy_fixup and adds it to the list
* @bus_id: A string which matches phydev->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);
/* 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, dev_name(&phydev->dev)) != 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;
}
}
}
mutex_unlock(&phy_fixup_lock);
return 0;
}
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;
/* We allocate the device, and initialize the default values */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (NULL == dev)
return (struct phy_device *)PTR_ERR((void *)-ENOMEM);
dev->dev.release = phy_device_release;
dev->speed = 0;
dev->duplex = -1;
dev->pause = 0;
dev->asym_pause = 0;
dev->link = 1;
dev->interface = PHY_INTERFACE_MODE_GMII;
dev->autoneg = AUTONEG_ENABLE;
dev->is_c45 = is_c45;
dev->addr = addr;
dev->phy_id = phy_id;
if (c45_ids)
dev->c45_ids = *c45_ids;
dev->bus = bus;
dev->dev.parent = bus->parent;
dev->dev.bus = &mdio_bus_type;
dev->irq = bus->irq != NULL ? bus->irq[addr] : PHY_POLL;
dev_set_name(&dev->dev, PHY_ID_FMT, bus->id, addr);
dev->state = PHY_DOWN;
mutex_init(&dev->lock);
INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine);
INIT_WORK(&dev->phy_queue, phy_change);
/* 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.
*/
request_module(MDIO_MODULE_PREFIX MDIO_ID_FMT, MDIO_ID_ARGS(phy_id));
device_initialize(&dev->dev);
return dev;
}
EXPORT_SYMBOL(phy_device_create);
/**
* 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);
/* Find first non-zero Devices In package. Device
* zero is reserved, so don't probe it.
*/
for (i = 1;
i < num_ids && c45_ids->devices_in_package == 0;
i++) {
reg_addr = MII_ADDR_C45 | i << 16 | 6;
phy_reg = mdiobus_read(bus, addr, reg_addr);
if (phy_reg < 0)
return -EIO;
c45_ids->devices_in_package = (phy_reg & 0xffff) << 16;
reg_addr = MII_ADDR_C45 | i << 16 | 5;
phy_reg = mdiobus_read(bus, addr, reg_addr);
if (phy_reg < 0)
return -EIO;
c45_ids->devices_in_package |= (phy_reg & 0xffff);
/* If mostly Fs, there is no device there,
* let's get out of here.
*/
if ((c45_ids->devices_in_package & 0x1fffffff) == 0x1fffffff) {
*phy_id = 0xffffffff;
return 0;
}
}
/* 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)
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 NULL;
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;
/* Don't register a phy if one is already registered at this address */
if (phydev->bus->phy_map[phydev->addr])
return -EINVAL;
phydev->bus->phy_map[phydev->addr] = phydev;
/* Run all of the fixups for this PHY */
err = phy_init_hw(phydev);
if (err) {
pr_err("PHY %d failed to initialize\n", phydev->addr);
goto out;
}
err = device_add(&phydev->dev);
if (err) {
pr_err("PHY %d failed to add\n", phydev->addr);
goto out;
}
return 0;
out:
phydev->bus->phy_map[phydev->addr] = NULL;
return err;
}
EXPORT_SYMBOL(phy_device_register);
/**
* 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)
{
int addr;
for (addr = 0; addr < PHY_MAX_ADDR; addr++) {
if (bus->phy_map[addr])
return bus->phy_map[addr];
}
return NULL;
}
EXPORT_SYMBOL(phy_find_first);
/**
* 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);
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;
if (!phydev->drv || !phydev->drv->config_init)
return 0;
ret = phy_write(phydev, MII_BMCR, BMCR_RESET);
if (ret < 0)
return ret;
ret = phy_poll_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);
/**
* 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.
*/
int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
u32 flags, phy_interface_t interface)
{
struct device *d = &phydev->dev;
int err;
/* Assume that if there is no driver, that it doesn't
* exist, and we should use the genphy driver.
*/
if (NULL == d->driver) {
if (phydev->is_c45)
d->driver = &genphy_driver[GENPHY_DRV_10G].driver;
else
d->driver = &genphy_driver[GENPHY_DRV_1G].driver;
err = d->driver->probe(d);
if (err >= 0)
err = device_bind_driver(d);
if (err)
return err;
}
if (phydev->attached_dev) {
dev_err(&dev->dev, "PHY already attached\n");
return -EBUSY;
}
phydev->attached_dev = dev;
dev->phydev = phydev;
phydev->dev_flags = flags;
phydev->interface = interface;
phydev->state = PHY_READY;
/* Do initial configuration here, now that
* we have certain key parameters
* (dev_flags and interface)
*/
err = phy_init_hw(phydev);
if (err)
phy_detach(phydev);
phy_resume(phydev);
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);
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
*/
void phy_detach(struct phy_device *phydev)
{
int i;
phydev->attached_dev->phydev = NULL;
phydev->attached_dev = NULL;
phy_suspend(phydev);
/* 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
*/
for (i = 0; i < ARRAY_SIZE(genphy_driver); i++) {
if (phydev->dev.driver == &genphy_driver[i].driver) {
device_release_driver(&phydev->dev);
break;
}
}
}
EXPORT_SYMBOL(phy_detach);
int phy_suspend(struct phy_device *phydev)
{
struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
struct ethtool_wolinfo wol = { .cmd = ETHTOOL_GWOL };
/* If the device has WOL enabled, we cannot suspend the PHY */
phy_ethtool_get_wol(phydev, &wol);
if (wol.wolopts)
return -EBUSY;
if (phydrv->suspend)
return phydrv->suspend(phydev);
return 0;
}
int phy_resume(struct phy_device *phydev)
{
struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
if (phydrv->resume)
return phydrv->resume(phydev);
return 0;
}
/* 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 */
phydev->advertising &= phydev->supported;
advertise = 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 (phydev->supported & (SUPPORTED_1000baseT_Half |
SUPPORTED_1000baseT_Full)) {
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_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)
{
int 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_write(phydev, MII_BMCR, 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)
{
int ctl = phy_read(phydev, MII_BMCR);
if (ctl < 0)
return ctl;
ctl |= BMCR_ANENABLE | BMCR_ANRESTART;
/* Don't isolate the PHY if we're negotiating */
ctl &= ~BMCR_ISOLATE;
return phy_write(phydev, MII_BMCR, ctl);
}
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 result;
if (AUTONEG_ENABLE != phydev->autoneg)
return genphy_setup_forced(phydev);
result = genphy_config_advert(phydev);
if (result < 0) /* error */
return result;
if (result == 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))
result = 1; /* do restart aneg */
}
/* Only restart aneg if we are advertising something different
* than we were before.
*/
if (result > 0)
result = genphy_restart_aneg(phydev);
return result;
}
EXPORT_SYMBOL(genphy_config_aneg);
static int gen10g_config_aneg(struct phy_device *phydev)
{
return 0;
}
/**
* 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;
phydev->lp_advertising = 0;
if (AUTONEG_ENABLE == phydev->autoneg) {
if (phydev->supported & (SUPPORTED_1000baseT_Half
| SUPPORTED_1000baseT_Full)) {
lpagb = phy_read(phydev, MII_STAT1000);
if (lpagb < 0)
return lpagb;
adv = phy_read(phydev, MII_CTRL1000);
if (adv < 0)
return adv;
phydev->lp_advertising =
mii_stat1000_to_ethtool_lpa_t(lpagb);
common_adv_gb = lpagb & adv << 2;
}
lpa = phy_read(phydev, MII_LPA);
if (lpa < 0)
return lpa;
phydev->lp_advertising |= mii_lpa_to_ethtool_lpa_t(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);
static int gen10g_read_status(struct phy_device *phydev)
{
int devad, reg;
u32 mmd_mask = phydev->c45_ids.devices_in_package;
phydev->link = 1;
/* For now just lie and say it's 10G all the time */
phydev->speed = SPEED_10000;
phydev->duplex = DUPLEX_FULL;
for (devad = 0; mmd_mask; devad++, mmd_mask = mmd_mask >> 1) {
if (!(mmd_mask & 1))
continue;
/* Read twice because link state is latched and a
* read moves the current state into the register
*/
phy_read_mmd(phydev, devad, MDIO_STAT1);
reg = phy_read_mmd(phydev, devad, MDIO_STAT1);
if (reg < 0 || !(reg & MDIO_STAT1_LSTATUS))
phydev->link = 0;
}
return 0;
}
static int genphy_config_init(struct phy_device *phydev)
{
int val;
u32 features;
/* For now, I'll claim that the generic driver supports
* all possible port types
*/
features = (SUPPORTED_TP | SUPPORTED_MII
| SUPPORTED_AUI | SUPPORTED_FIBRE |
SUPPORTED_BNC);
/* Do we support autonegotiation? */
val = phy_read(phydev, MII_BMSR);
if (val < 0)
return val;
if (val & BMSR_ANEGCAPABLE)
features |= SUPPORTED_Autoneg;
if (val & BMSR_100FULL)
features |= SUPPORTED_100baseT_Full;
if (val & BMSR_100HALF)
features |= SUPPORTED_100baseT_Half;
if (val & BMSR_10FULL)
features |= SUPPORTED_10baseT_Full;
if (val & BMSR_10HALF)
features |= SUPPORTED_10baseT_Half;
if (val & BMSR_ESTATEN) {
val = phy_read(phydev, MII_ESTATUS);
if (val < 0)
return val;
if (val & ESTATUS_1000_TFULL)
features |= SUPPORTED_1000baseT_Full;
if (val & ESTATUS_1000_THALF)
features |= SUPPORTED_1000baseT_Half;
}
phydev->supported = features;
phydev->advertising = features;
return 0;
}
static int gen10g_config_init(struct phy_device *phydev)
{
/* Temporarily just say we support everything */
phydev->supported = SUPPORTED_10000baseT_Full;
phydev->advertising = SUPPORTED_10000baseT_Full;
return 0;
}
int genphy_suspend(struct phy_device *phydev)
{
int value;
mutex_lock(&phydev->lock);
value = phy_read(phydev, MII_BMCR);
phy_write(phydev, MII_BMCR, value | BMCR_PDOWN);
mutex_unlock(&phydev->lock);
return 0;
}
EXPORT_SYMBOL(genphy_suspend);
static int gen10g_suspend(struct phy_device *phydev)
{
return 0;
}
int genphy_resume(struct phy_device *phydev)
{
int value;
mutex_lock(&phydev->lock);
value = phy_read(phydev, MII_BMCR);
phy_write(phydev, MII_BMCR, value & ~BMCR_PDOWN);
mutex_unlock(&phydev->lock);
return 0;
}
EXPORT_SYMBOL(genphy_resume);
static int gen10g_resume(struct phy_device *phydev)
{
return 0;
}
/**
* 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->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 (!(phydrv->flags & PHY_HAS_INTERRUPT) &&
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
*/
phydev->supported = phydrv->features;
phydev->advertising = phydrv->features;
/* Set the state to READY by default */
phydev->state = PHY_READY;
if (phydev->drv->probe)
err = phydev->drv->probe(phydev);
mutex_unlock(&phydev->lock);
return err;
}
static int phy_remove(struct device *dev)
{
struct phy_device *phydev = to_phy_device(dev);
mutex_lock(&phydev->lock);
phydev->state = PHY_DOWN;
mutex_unlock(&phydev->lock);
if (phydev->drv->remove)
phydev->drv->remove(phydev);
phydev->drv = NULL;
return 0;
}
/**
* phy_driver_register - register a phy_driver with the PHY layer
* @new_driver: new phy_driver to register
*/
int phy_driver_register(struct phy_driver *new_driver)
{
int retval;
new_driver->driver.name = new_driver->name;
new_driver->driver.bus = &mdio_bus_type;
new_driver->driver.probe = phy_probe;
new_driver->driver.remove = phy_remove;
retval = driver_register(&new_driver->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)
{
int i, ret = 0;
for (i = 0; i < n; i++) {
ret = phy_driver_register(new_driver + i);
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->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",
.config_init = genphy_config_init,
.features = 0,
.config_aneg = genphy_config_aneg,
.read_status = genphy_read_status,
.suspend = genphy_suspend,
.resume = genphy_resume,
.driver = { .owner = THIS_MODULE, },
}, {
.phy_id = 0xffffffff,
.phy_id_mask = 0xffffffff,
.name = "Generic 10G PHY",
.config_init = gen10g_config_init,
.features = 0,
.config_aneg = gen10g_config_aneg,
.read_status = gen10g_read_status,
.suspend = gen10g_suspend,
.resume = gen10g_resume,
.driver = {.owner = THIS_MODULE, },
} };
static int __init phy_init(void)
{
int rc;
rc = mdio_bus_init();
if (rc)
return rc;
rc = phy_drivers_register(genphy_driver,
ARRAY_SIZE(genphy_driver));
if (rc)
mdio_bus_exit();
return rc;
}
static void __exit phy_exit(void)
{
phy_drivers_unregister(genphy_driver,
ARRAY_SIZE(genphy_driver));
mdio_bus_exit();
}
subsys_initcall(phy_init);
module_exit(phy_exit);