litmus-rt.git - The LITMUS^RT kernel.

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author	Linus Torvalds <torvalds@linux-foundation.org>	2009-06-11 13:00:50 -0400
committer	Linus Torvalds <torvalds@linux-foundation.org>	2009-06-11 13:00:50 -0400
commit	e893123c7378192c094747dadec326b7c000c190 (patch)
tree	3fac44dceaa87339819d078e2bd69ea9a01056c3 /Documentation/hwmon
parent	27951daa71f1c91300ae4de9441916d1ffe2b078 (diff)
parent	a41f20716975910d9beb90b7efc61107901492b8 (diff)

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (49 commits) ext4: Avoid corrupting the uninitialized bit in the extent during truncate ext4: Don't treat a truncation of a zero-length file as replace-via-truncate ext4: fix dx_map_entry to support 256k directory blocks ext4: truncate the file properly if we fail to copy data from userspace ext4: Avoid leaking blocks after a block allocation failure ext4: Change all super.c messages to print the device ext4: Get rid of EXTEND_DISKSIZE flag of ext4_get_blocks_handle() ext4: super.c whitespace cleanup jbd2: Fix minor typos in comments in fs/jbd2/journal.c ext4: Clean up calls to ext4_get_group_desc() ext4: remove unused function __ext4_write_dirty_metadata ext2: Fix memory leak in ext2_fill_super() in case of a failed mount ext3: Fix memory leak in ext3_fill_super() in case of a failed mount ext4: Fix memory leak in ext4_fill_super() in case of a failed mount ext4: down i_data_sem only for read when walking tree for fiemap ext4: Add a comprehensive block validity check to ext4_get_blocks() ext4: Clean up ext4_get_blocks() so it does not depend on bh_result->b_state ext4: Merge ext4_da_get_block_write() into mpage_da_map_blocks() ext4: Add BUG_ON debugging checks to noalloc_get_block_write() ext4: Add documentation to the ext4_*get_block* functions ...

Diffstat (limited to 'Documentation/hwmon')

0 files changed, 0 insertions, 0 deletions

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/* * 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. * */ #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 <asm/io.h> #include <asm/irq.h> #include <asm/uaccess.h> MODULE_DESCRIPTION("PHY library"); MODULE_AUTHOR("Andy Fleming"); MODULE_LICENSE("GPL"); static struct phy_driver genphy_driver; extern int mdio_bus_init(void); extern void mdio_bus_exit(void); void phy_device_free(struct phy_device *phydev) { kfree(phydev); } static void phy_device_release(struct device *dev) { phy_device_free(to_phy_device(dev)); } static LIST_HEAD(phy_fixup_list); static DEFINE_MUTEX(phy_fixup_lock); /* * 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; fixup = kzalloc(sizeof(struct phy_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 */ 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; err = fixup->run(phydev); if (err < 0) return err; } } mutex_unlock(&phy_fixup_lock); return 0; } EXPORT_SYMBOL(phy_scan_fixups); struct phy_device* phy_device_create(struct mii_bus *bus, int addr, int phy_id) { 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 = dev->asym_pause = 0; dev->link = 1; dev->interface = PHY_INTERFACE_MODE_GMII; dev->autoneg = AUTONEG_ENABLE; dev->addr = addr; dev->phy_id = phy_id; dev->bus = bus; dev->state = PHY_DOWN; mutex_init(&dev->lock); return dev; } EXPORT_SYMBOL(phy_device_create); /** * 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. * * Description: Reads the ID registers of the PHY at @addr on the * @bus, stores it in @phy_id and returns zero on success. */ int get_phy_id(struct mii_bus *bus, int addr, u32 *phy_id) { int phy_reg; /* Grab the bits from PHYIR1, and put them * in the upper half */ phy_reg = bus->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 = bus->read(bus, addr, MII_PHYSID2); if (phy_reg < 0) return -EIO; *phy_id |= (phy_reg & 0xffff); return 0; } EXPORT_SYMBOL(get_phy_id); /** * 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 * * 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) { struct phy_device *dev = NULL; u32 phy_id; int r; r = get_phy_id(bus, addr, &phy_id); 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; dev = phy_device_create(bus, addr, phy_id); return dev; } /** * 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. */ void phy_prepare_link(struct phy_device *phydev, void (*handler)(struct net_device *)) { phydev->adjust_link = handler; } /** * 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 * @flags: PHY device's dev_flags * @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 *), u32 flags, phy_interface_t interface) { struct phy_device *phydev; phydev = phy_attach(dev, bus_id, flags, interface); if (IS_ERR(phydev)) return phydev; phy_prepare_link(phydev, handler); phy_start_machine(phydev, NULL); if (phydev->irq > 0) phy_start_interrupts(phydev); 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_attach - attach a network device to a particular PHY device * @dev: network device to attach * @bus_id: 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 the * genphy_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. */ struct phy_device *phy_attach(struct net_device *dev, const char *bus_id, u32 flags, phy_interface_t interface) { struct bus_type *bus = &mdio_bus_type; struct phy_device *phydev; struct device *d; /* 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) { phydev = to_phy_device(d); } else { printk(KERN_ERR "%s not found\n", bus_id); return ERR_PTR(-ENODEV); } /* Assume that if there is no driver, that it doesn't * exist, and we should use the genphy driver. */ if (NULL == d->driver) { int err; d->driver = &genphy_driver.driver; err = d->driver->probe(d); if (err >= 0) err = device_bind_driver(d); if (err) return ERR_PTR(err); } if (phydev->attached_dev) { printk(KERN_ERR "%s: %s already attached\n", dev->name, bus_id); return ERR_PTR(-EBUSY); } phydev->attached_dev = dev; phydev->dev_flags = flags; phydev->interface = interface; /* Do initial configuration here, now that * we have certain key parameters * (dev_flags and interface) */ if (phydev->drv->config_init) { int err; err = phy_scan_fixups(phydev); if (err < 0) return ERR_PTR(err); err = phydev->drv->config_init(phydev); if (err < 0) return ERR_PTR(err); } 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) { phydev->attached_dev = NULL; /* 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->dev.driver == &genphy_driver.driver) device_release_driver(&phydev->dev); } EXPORT_SYMBOL(phy_detach); /* Generic PHY support and helper functions */ /** * genphy_config_advert - sanitize and advertise auto-negotation 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. */ int genphy_config_advert(struct phy_device *phydev) { u32 advertise; int oldadv, adv; int err, changed = 0; /* Only allow advertising what * this PHY supports */ phydev->advertising &= phydev->supported; advertise = phydev->advertising; /* Setup standard advertisement */ oldadv = adv = phy_read(phydev, MII_ADVERTISE); if (adv < 0) return adv; adv &= ~(ADVERTISE_ALL | ADVERTISE_100BASE4 | ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM); if (advertise & ADVERTISED_10baseT_Half) adv |= ADVERTISE_10HALF; if (advertise & ADVERTISED_10baseT_Full) adv |= ADVERTISE_10FULL; if (advertise & ADVERTISED_100baseT_Half) adv |= ADVERTISE_100HALF; if (advertise & ADVERTISED_100baseT_Full) adv |= ADVERTISE_100FULL; if (advertise & ADVERTISED_Pause) adv |= ADVERTISE_PAUSE_CAP; if (advertise & ADVERTISED_Asym_Pause) adv |= ADVERTISE_PAUSE_ASYM; if (adv != oldadv) { err = phy_write(phydev, MII_ADVERTISE, adv); if (err < 0) return err; changed = 1; } /* Configure gigabit if it's supported */ if (phydev->supported & (SUPPORTED_1000baseT_Half | SUPPORTED_1000baseT_Full)) { oldadv = adv = phy_read(phydev, MII_CTRL1000); if (adv < 0) return adv; adv &= ~(ADVERTISE_1000FULL | ADVERTISE_1000HALF); if (advertise & SUPPORTED_1000baseT_Half) adv |= ADVERTISE_1000HALF; if (advertise & SUPPORTED_1000baseT_Full) adv |= ADVERTISE_1000FULL; if (adv != oldadv) { err = phy_write(phydev, MII_CTRL1000, adv); if (err < 0) return err; changed = 1; } } return changed; } EXPORT_SYMBOL(genphy_config_advert); /** * genphy_setup_forced - configures/forces speed/duplex from @phydev * @phydev: target phy_device struct * * Description: Configures MII_BMCR to force speed/duplex * to the values in phydev. Assumes that the values are valid. * Please see phy_sanitize_settings(). */ int genphy_setup_forced(struct phy_device *phydev) { int err; int ctl = 0; phydev->pause = 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; err = phy_write(phydev, MII_BMCR, ctl); return err; } /** * genphy_restart_aneg - Enable and Restart Autonegotiation * @phydev: target phy_device struct */ int genphy_restart_aneg(struct phy_device *phydev) { int ctl; 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); ctl = phy_write(phydev, MII_BMCR, ctl); return 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) { /* Advertisment 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); /** * 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; /* Update the link, but return if there * was an error */ err = genphy_update_link(phydev); if (err) return err; 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; lpagb &= adv << 2; } lpa = phy_read(phydev, MII_LPA); if (lpa < 0) return lpa; adv = phy_read(phydev, MII_ADVERTISE); if (adv < 0) return adv; lpa &= adv; phydev->speed = SPEED_10; phydev->duplex = DUPLEX_HALF; phydev->pause = phydev->asym_pause = 0; if (lpagb & (LPA_1000FULL | LPA_1000HALF)) { phydev->speed = SPEED_1000; if (lpagb & LPA_1000FULL) phydev->duplex = DUPLEX_FULL; } else if (lpa & (LPA_100FULL | LPA_100HALF)) { phydev->speed = SPEED_100; if (lpa & LPA_100FULL) phydev->duplex = DUPLEX_FULL; } else if (lpa & 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 = phydev->asym_pause = 0; } return 0; } EXPORT_SYMBOL(genphy_read_status); 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; } 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); 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); /** * 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; struct phy_driver *phydrv; struct device_driver *drv; int err = 0; phydev = to_phy_device(dev); /* Make sure the driver is held. * XXX -- Is this correct? */ drv = get_driver(phydev->dev.driver); phydrv = to_phy_driver(drv); phydev->drv = phydrv; /* Disable the interrupt if the PHY doesn't support it */ if (!(phydrv->flags & PHY_HAS_INTERRUPT)) phydev->irq = PHY_POLL; 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; 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); put_driver(dev->driver); 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) { printk(KERN_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); void phy_driver_unregister(struct phy_driver *drv) { driver_unregister(&drv->driver); } EXPORT_SYMBOL(phy_driver_unregister);


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