diff options
Diffstat (limited to 'drivers/net/phy/phy_device.c')
| -rw-r--r-- | drivers/net/phy/phy_device.c | 2045 |
1 files changed, 2045 insertions, 0 deletions
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c new file mode 100644 index 000000000..a03d0627e --- /dev/null +++ b/drivers/net/phy/phy_device.c @@ -0,0 +1,2045 @@ +/* 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/phy_led_triggers.h> +#include <linux/mdio.h> +#include <linux/io.h> +#include <linux/uaccess.h> +#include <linux/of.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->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) + goto out; + + if (netdev->wol_enabled) + return false; + + /* As long as not all affected network drivers support the + * wol_enabled flag, let's check for hints that WoL is enabled. + * Don't suspend PHY if the attached netdev parent may wake up. + * The parent may point to a PCI device, as in tg3 driver. + */ + if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent)) + return false; + + /* Also don't suspend PHY if the netdev itself may wakeup. This + * is the case for devices w/o underlaying pwr. mgmt. aware bus, + * e.g. SoC devices. + */ + if (device_may_wakeup(&netdev->dev)) + return false; + +out: + return !phydev->suspended; +} + +static int mdio_bus_phy_suspend(struct device *dev) +{ + struct phy_device *phydev = to_phy_device(dev); + + /* We must stop the state machine manually, otherwise it stops out of + * control, possibly with the phydev->lock held. Upon resume, netdev + * may call phy routines that try to grab the same lock, and that may + * lead to a deadlock. + */ + if (phydev->attached_dev && phydev->adjust_link) + phy_stop_machine(phydev); + + if (!mdio_bus_phy_may_suspend(phydev)) + return 0; + + phydev->suspended_by_mdio_bus = 1; + + return phy_suspend(phydev); +} + +static int mdio_bus_phy_resume(struct device *dev) +{ + struct phy_device *phydev = to_phy_device(dev); + int ret; + + if (!phydev->suspended_by_mdio_bus) + goto no_resume; + + phydev->suspended_by_mdio_bus = 0; + + ret = phy_resume(phydev); + if (ret < 0) + return ret; + +no_resume: + if (phydev->attached_dev && phydev->adjust_link) + phy_start_machine(phydev); + + return 0; +} + +static int mdio_bus_phy_restore(struct device *dev) +{ + struct phy_device *phydev = to_phy_device(dev); + struct net_device *netdev = phydev->attached_dev; + int ret; + + if (!netdev) + return 0; + + ret = phy_init_hw(phydev); + if (ret < 0) + return ret; + + if (phydev->attached_dev && phydev->adjust_link) + phy_start_machine(phydev); + + return 0; +} + +static const struct dev_pm_ops mdio_bus_phy_pm_ops = { + .suspend = mdio_bus_phy_suspend, + .resume = mdio_bus_phy_resume, + .freeze = mdio_bus_phy_suspend, + .thaw = mdio_bus_phy_resume, + .restore = mdio_bus_phy_restore, +}; + +#define MDIO_BUS_PHY_PM_OPS (&mdio_bus_phy_pm_ops) + +#else + +#define MDIO_BUS_PHY_PM_OPS NULL + +#endif /* CONFIG_PM */ + +/** + * phy_register_fixup - creates a new phy_fixup and adds it to the list + * @bus_id: A string which matches phydev->mdio.dev.bus_id (or PHY_ANY_ID) + * @phy_uid: Used to match against phydev->phy_id (the UID of the PHY) + * It can also be PHY_ANY_UID + * @phy_uid_mask: Applied to phydev->phy_id and fixup->phy_uid before + * comparison + * @run: The actual code to be run when a matching PHY is found + */ +int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask, + int (*run)(struct phy_device *)) +{ + struct phy_fixup *fixup = kzalloc(sizeof(*fixup), GFP_KERNEL); + + if (!fixup) + return -ENOMEM; + + strlcpy(fixup->bus_id, bus_id, sizeof(fixup->bus_id)); + fixup->phy_uid = phy_uid; + fixup->phy_uid_mask = phy_uid_mask; + fixup->run = run; + + mutex_lock(&phy_fixup_lock); + list_add_tail(&fixup->list, &phy_fixup_list); + mutex_unlock(&phy_fixup_lock); + + return 0; +} +EXPORT_SYMBOL(phy_register_fixup); + +/* Registers a fixup to be run on any PHY with the UID in phy_uid */ +int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask, + int (*run)(struct phy_device *)) +{ + return phy_register_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask, run); +} +EXPORT_SYMBOL(phy_register_fixup_for_uid); + +/* Registers a fixup to be run on the PHY with id string bus_id */ +int phy_register_fixup_for_id(const char *bus_id, + int (*run)(struct phy_device *)) +{ + return phy_register_fixup(bus_id, PHY_ANY_UID, 0xffffffff, run); +} +EXPORT_SYMBOL(phy_register_fixup_for_id); + +/** + * phy_unregister_fixup - remove a phy_fixup from the list + * @bus_id: A string matches fixup->bus_id (or PHY_ANY_ID) in phy_fixup_list + * @phy_uid: A phy id matches fixup->phy_id (or PHY_ANY_UID) in phy_fixup_list + * @phy_uid_mask: Applied to phy_uid and fixup->phy_uid before comparison + */ +int phy_unregister_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask) +{ + struct list_head *pos, *n; + struct phy_fixup *fixup; + int ret; + + ret = -ENODEV; + + mutex_lock(&phy_fixup_lock); + list_for_each_safe(pos, n, &phy_fixup_list) { + fixup = list_entry(pos, struct phy_fixup, list); + + if ((!strcmp(fixup->bus_id, bus_id)) && + ((fixup->phy_uid & phy_uid_mask) == + (phy_uid & phy_uid_mask))) { + list_del(&fixup->list); + kfree(fixup); + ret = 0; + break; + } + } + mutex_unlock(&phy_fixup_lock); + + return ret; +} +EXPORT_SYMBOL(phy_unregister_fixup); + +/* Unregisters a fixup of any PHY with the UID in phy_uid */ +int phy_unregister_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask) +{ + return phy_unregister_fixup(PHY_ANY_ID, phy_uid, phy_uid_mask); +} +EXPORT_SYMBOL(phy_unregister_fixup_for_uid); + +/* Unregisters a fixup of the PHY with id string bus_id */ +int phy_unregister_fixup_for_id(const char *bus_id) +{ + return phy_unregister_fixup(bus_id, PHY_ANY_UID, 0xffffffff); +} +EXPORT_SYMBOL(phy_unregister_fixup_for_id); + +/* Returns 1 if fixup matches phydev in bus_id and phy_uid. + * Fixups can be set to match any in one or more fields. + */ +static int phy_needs_fixup(struct phy_device *phydev, struct phy_fixup *fixup) +{ + if (strcmp(fixup->bus_id, phydev_name(phydev)) != 0) + if (strcmp(fixup->bus_id, PHY_ANY_ID) != 0) + return 0; + + if ((fixup->phy_uid & fixup->phy_uid_mask) != + (phydev->phy_id & fixup->phy_uid_mask)) + if (fixup->phy_uid != PHY_ANY_UID) + return 0; + + return 1; +} + +/* Runs any matching fixups for this phydev */ +static int phy_scan_fixups(struct phy_device *phydev) +{ + struct phy_fixup *fixup; + + mutex_lock(&phy_fixup_lock); + list_for_each_entry(fixup, &phy_fixup_list, list) { + if (phy_needs_fixup(phydev, fixup)) { + int err = fixup->run(phydev); + + if (err < 0) { + mutex_unlock(&phy_fixup_lock); + return err; + } + phydev->has_fixups = true; + } + } + mutex_unlock(&phy_fixup_lock); + + return 0; +} + +static int phy_bus_match(struct device *dev, struct device_driver *drv) +{ + struct phy_device *phydev = to_phy_device(dev); + struct phy_driver *phydrv = to_phy_driver(drv); + const int num_ids = ARRAY_SIZE(phydev->c45_ids.device_ids); + int i; + + if (!(phydrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY)) + return 0; + + if (phydrv->match_phy_device) + return phydrv->match_phy_device(phydev); + + if (phydev->is_c45) { + for (i = 1; i < num_ids; i++) { + if (!(phydev->c45_ids.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 = SPEED_UNKNOWN; + dev->duplex = DUPLEX_UNKNOWN; + dev->pause = 0; + dev->asym_pause = 0; + dev->link = 0; + dev->interface = PHY_INTERFACE_MODE_GMII; + + dev->autoneg = AUTONEG_ENABLE; + + dev->is_c45 = is_c45; + dev->phy_id = phy_id; + if (c45_ids) + dev->c45_ids = *c45_ids; + dev->irq = bus->irq[addr]; + dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr); + + dev->state = PHY_DOWN; + + mutex_init(&dev->lock); + INIT_DELAYED_WORK(&dev->state_queue, phy_state_machine); + INIT_WORK(&dev->phy_queue, phy_change_work); + + /* 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(&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) { + /* returning -ENODEV doesn't stop bus scanning */ + return (phy_reg == -EIO || phy_reg == -ENODEV) ? -ENODEV : -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) { + pr_err("PHY %d failed to initialize\n", phydev->mdio.addr); + goto out; + } + + err = device_add(&phydev->mdio.dev); + if (err) { + pr_err("PHY %d failed to add\n", phydev->mdio.addr); + 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; + + if (!dev) + return -EINVAL; + + 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); + else + ret = genphy_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, ...) +{ + 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; + } + + + if (!fmt) { + dev_info(&phydev->mdio.dev, ATTACHED_FMT "\n", + drv_name, phydev_name(phydev), + irq_str); + } else { + va_list ap; + + dev_info(&phydev->mdio.dev, ATTACHED_FMT, + 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; + + 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: + module_put(d->driver->owner); +error_put_device: + put_device(d); + if (ndev_owner != bus->owner) + module_put(bus->owner); + return err; +} +EXPORT_SYMBOL(phy_attach_direct); + +/** + * phy_attach - attach a network device to a particular PHY device + * @dev: network device to attach + * @bus_id: Bus ID of PHY device to attach + * @interface: PHY device's interface + * + * Description: Same as phy_attach_direct() except that a PHY bus_id + * string is passed instead of a pointer to a struct phy_device. + */ +struct phy_device *phy_attach(struct net_device *dev, const char *bus_id, + phy_interface_t interface) +{ + struct bus_type *bus = &mdio_bus_type; + struct phy_device *phydev; + struct device *d; + int rc; + + if (!dev) + return ERR_PTR(-EINVAL); + + /* Search the list of PHY devices on the mdio bus for the + * PHY with the requested name + */ + d = bus_find_device_by_name(bus, NULL, bus_id); + if (!d) { + pr_err("PHY %s not found\n", bus_id); + return ERR_PTR(-ENODEV); + } + phydev = to_phy_device(d); + + rc = phy_attach_direct(dev, phydev, phydev->dev_flags, interface); + put_device(d); + if (rc) + return ERR_PTR(rc); + + return phydev; +} +EXPORT_SYMBOL(phy_attach); + +/** + * 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; + phydev->phylink = NULL; + + phy_led_triggers_unregister(phydev); + + if (phydev->mdio.dev.driver) + module_put(phydev->mdio.dev.driver->owner); + + /* If the device had no specific driver before (i.e. - it + * was using the generic driver), we unbind the device + * from the generic driver so that there's a chance a + * real driver could be loaded + */ + if (phydev->mdio.dev.driver == &genphy_10g_driver.mdiodrv.driver || + phydev->mdio.dev.driver == &genphy_driver.mdiodrv.driver) + device_release_driver(&phydev->mdio.dev); + + /* Assert the reset signal */ + phy_device_reset(phydev, 1); + + /* + * 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); +} +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 */ + 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_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; + + /* The link state is latched low so that momentary link + * drops can be detected. Do not double-read the status + * in polling mode to detect such short link drops. + */ + if (!phy_polling_mode(phydev)) { + 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; + + 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; + } + + 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); + +/** + * 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_set_bits(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; + u32 features; + + features = (SUPPORTED_TP | SUPPORTED_MII + | SUPPORTED_AUI | SUPPORTED_FIBRE | + SUPPORTED_BNC | SUPPORTED_Pause | SUPPORTED_Asym_Pause); + + /* 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; +} +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: + phydev->supported &= ~PHY_100BT_FEATURES; + /* fall through */ + case SPEED_100: + phydev->supported &= ~PHY_1000BT_FEATURES; + 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; + + phydev->advertising = phydev->supported; + + return 0; +} +EXPORT_SYMBOL(phy_set_max_speed); + +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; +} + +/** + * 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 (!(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; + of_set_phy_supported(phydev); + 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); + + /* 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 (phydrv->features & (SUPPORTED_Pause | SUPPORTED_Asym_Pause)) { + phydev->supported &= ~(SUPPORTED_Pause | SUPPORTED_Asym_Pause); + phydev->supported |= phydrv->features & + (SUPPORTED_Pause | SUPPORTED_Asym_Pause); + } else { + phydev->supported |= SUPPORTED_Pause | SUPPORTED_Asym_Pause; + } + + /* 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; + + /* The following works around an issue where the PHY driver doesn't bind + * to the device, resulting in the genphy driver being used instead of + * the dedicated driver. The root cause of the issue isn't known yet + * and seems to be in the base driver core. Once this is fixed we may + * remove this workaround. + */ + new_driver->mdiodrv.driver.probe_type = PROBE_FORCE_SYNCHRONOUS; + + retval = driver_register(&new_driver->mdiodrv.driver); + if (retval) { + pr_err("%s: Error %d in registering driver\n", + new_driver->name, retval); + + return retval; + } + + pr_debug("%s: Registered new driver\n", new_driver->name); + + return 0; +} +EXPORT_SYMBOL(phy_driver_register); + +int phy_drivers_register(struct phy_driver *new_driver, int n, + struct module *owner) +{ + int i, ret = 0; + + for (i = 0; i < n; i++) { + ret = phy_driver_register(new_driver + i, owner); + if (ret) { + while (i-- > 0) + phy_driver_unregister(new_driver + i); + break; + } + } + return ret; +} +EXPORT_SYMBOL(phy_drivers_register); + +void phy_driver_unregister(struct phy_driver *drv) +{ + driver_unregister(&drv->mdiodrv.driver); +} +EXPORT_SYMBOL(phy_driver_unregister); + +void phy_drivers_unregister(struct phy_driver *drv, int n) +{ + int i; + + for (i = 0; i < n; i++) + phy_driver_unregister(drv + i); +} +EXPORT_SYMBOL(phy_drivers_unregister); + +static struct phy_driver genphy_driver = { + .phy_id = 0xffffffff, + .phy_id_mask = 0xffffffff, + .name = "Generic PHY", + .soft_reset = genphy_no_soft_reset, + .config_init = genphy_config_init, + .features = PHY_GBIT_FEATURES | SUPPORTED_MII | + SUPPORTED_AUI | SUPPORTED_FIBRE | + SUPPORTED_BNC, + .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; + + 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); |