[deliverable/linux.git] / drivers / net / phy / mdio_bus.c

/*
 * drivers/net/phy/mdio_bus.c
 *
 * MDIO Bus interface
 *
 * 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/device.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.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>

/**
 * mdiobus_alloc_size - allocate a mii_bus structure
 * @size: extra amount of memory to allocate for private storage.
 * If non-zero, then bus->priv is points to that memory.
 *
 * Description: called by a bus driver to allocate an mii_bus
 * structure to fill in.
 */
struct mii_bus *mdiobus_alloc_size(size_t size)
{
	struct mii_bus *bus;
	size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);
	size_t alloc_size;

	/* If we alloc extra space, it should be aligned */
	if (size)
		alloc_size = aligned_size + size;
	else
		alloc_size = sizeof(*bus);

	bus = kzalloc(alloc_size, GFP_KERNEL);
	if (bus) {
		bus->state = MDIOBUS_ALLOCATED;
		if (size)
			bus->priv = (void *)bus + aligned_size;
	}

	return bus;
}
EXPORT_SYMBOL(mdiobus_alloc_size);

/**
 * mdiobus_release - mii_bus device release callback
 * @d: the target struct device that contains the mii_bus
 *
 * Description: called when the last reference to an mii_bus is
 * dropped, to free the underlying memory.
 */
static void mdiobus_release(struct device *d)
{
	struct mii_bus *bus = to_mii_bus(d);
	BUG_ON(bus->state != MDIOBUS_RELEASED &&
	       /* for compatibility with error handling in drivers */
	       bus->state != MDIOBUS_ALLOCATED);
	kfree(bus);
}

static struct class mdio_bus_class = {
	.name		= "mdio_bus",
	.dev_release	= mdiobus_release,
};

#if IS_ENABLED(CONFIG_OF_MDIO)
/* Helper function for of_mdio_find_bus */
static int of_mdio_bus_match(struct device *dev, void *mdio_bus_np)
{
	return dev->of_node == mdio_bus_np;
}
/**
 * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
 * @mdio_np: Pointer to the mii_bus.
 *
 * Returns a pointer to the mii_bus, or NULL if none found.
 *
 * Because the association of a device_node and mii_bus is made via
 * of_mdiobus_register(), the mii_bus cannot be found before it is
 * registered with of_mdiobus_register().
 *
 */
struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
{
	struct device *d;

	if (!mdio_bus_np)
		return NULL;

	d = class_find_device(&mdio_bus_class, NULL,  mdio_bus_np,
			      of_mdio_bus_match);

	return d ? to_mii_bus(d) : NULL;
}
EXPORT_SYMBOL(of_mdio_find_bus);
#endif

/**
 * mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
 * @bus: target mii_bus
 *
 * Description: Called by a bus driver to bring up all the PHYs
 *   on a given bus, and attach them to the bus.
 *
 * Returns 0 on success or < 0 on error.
 */
int mdiobus_register(struct mii_bus *bus)
{
	int i, err;

	if (NULL == bus || NULL == bus->name ||
			NULL == bus->read ||
			NULL == bus->write)
		return -EINVAL;

	BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
	       bus->state != MDIOBUS_UNREGISTERED);

	bus->dev.parent = bus->parent;
	bus->dev.class = &mdio_bus_class;
	bus->dev.groups = NULL;
	dev_set_name(&bus->dev, "%s", bus->id);

	err = device_register(&bus->dev);
	if (err) {
		printk(KERN_ERR "mii_bus %s failed to register\n", bus->id);
		return -EINVAL;
	}

	mutex_init(&bus->mdio_lock);

	if (bus->reset)
		bus->reset(bus);

	for (i = 0; i < PHY_MAX_ADDR; i++) {
		if ((bus->phy_mask & (1 << i)) == 0) {
			struct phy_device *phydev;

			phydev = mdiobus_scan(bus, i);
			if (IS_ERR(phydev)) {
				err = PTR_ERR(phydev);
				goto error;
			}
		}
	}

	bus->state = MDIOBUS_REGISTERED;
	pr_info("%s: probed\n", bus->name);
	return 0;

error:
	while (--i >= 0) {
		if (bus->phy_map[i])
			device_unregister(&bus->phy_map[i]->dev);
	}
	device_del(&bus->dev);
	return err;
}
EXPORT_SYMBOL(mdiobus_register);

void mdiobus_unregister(struct mii_bus *bus)
{
	int i;

	BUG_ON(bus->state != MDIOBUS_REGISTERED);
	bus->state = MDIOBUS_UNREGISTERED;

	device_del(&bus->dev);
	for (i = 0; i < PHY_MAX_ADDR; i++) {
		if (bus->phy_map[i])
			device_unregister(&bus->phy_map[i]->dev);
		bus->phy_map[i] = NULL;
	}
}
EXPORT_SYMBOL(mdiobus_unregister);

/**
 * mdiobus_free - free a struct mii_bus
 * @bus: mii_bus to free
 *
 * This function releases the reference to the underlying device
 * object in the mii_bus.  If this is the last reference, the mii_bus
 * will be freed.
 */
void mdiobus_free(struct mii_bus *bus)
{
	/*
	 * For compatibility with error handling in drivers.
	 */
	if (bus->state == MDIOBUS_ALLOCATED) {
		kfree(bus);
		return;
	}

	BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
	bus->state = MDIOBUS_RELEASED;

	put_device(&bus->dev);
}
EXPORT_SYMBOL(mdiobus_free);

struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr)
{
	struct phy_device *phydev;
	int err;

	phydev = get_phy_device(bus, addr);
	if (IS_ERR(phydev) || phydev == NULL)
		return phydev;

	err = phy_device_register(phydev);
	if (err) {
		phy_device_free(phydev);
		return NULL;
	}

	return phydev;
}
EXPORT_SYMBOL(mdiobus_scan);

/**
 * mdiobus_read - Convenience function for reading a given MII mgmt register
 * @bus: the mii_bus struct
 * @addr: the phy address
 * @regnum: register number to read
 *
 * NOTE: MUST NOT be called from interrupt context,
 * because the bus read/write functions may wait for an interrupt
 * to conclude the operation.
 */
int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
{
	int retval;

	BUG_ON(in_interrupt());

	mutex_lock(&bus->mdio_lock);
	retval = bus->read(bus, addr, regnum);
	mutex_unlock(&bus->mdio_lock);

	return retval;
}
EXPORT_SYMBOL(mdiobus_read);

/**
 * mdiobus_write - Convenience function for writing a given MII mgmt register
 * @bus: the mii_bus struct
 * @addr: the phy address
 * @regnum: register number to write
 * @val: value to write to @regnum
 *
 * NOTE: MUST NOT be called from interrupt context,
 * because the bus read/write functions may wait for an interrupt
 * to conclude the operation.
 */
int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
{
	int err;

	BUG_ON(in_interrupt());

	mutex_lock(&bus->mdio_lock);
	err = bus->write(bus, addr, regnum, val);
	mutex_unlock(&bus->mdio_lock);

	return err;
}
EXPORT_SYMBOL(mdiobus_write);

/**
 * mdio_bus_match - determine if given PHY driver supports the given PHY device
 * @dev: target PHY device
 * @drv: given PHY driver
 *
 * Description: Given a PHY device, and a PHY driver, return 1 if
 *   the driver supports the device.  Otherwise, return 0.
 */
static int mdio_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);

	return ((phydrv->phy_id & phydrv->phy_id_mask) ==
		(phydev->phy_id & phydrv->phy_id_mask));
}

#ifdef CONFIG_PM

static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
{
	struct device_driver *drv = phydev->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 (!netdev)
		return true;

	/*
	 * Don't suspend PHY if the attched netdev parent may wakeup.
	 * The parent may point to a PCI device, as in tg3 driver.
	 */
	if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
		return false;

	/*
	 * Also don't suspend PHY if the netdev itself may wakeup. This
	 * is the case for devices w/o underlaying pwr. mgmt. aware bus,
	 * e.g. SoC devices.
	 */
	if (device_may_wakeup(&netdev->dev))
		return false;

	return true;
}

static int mdio_bus_suspend(struct device *dev)
{
	struct phy_driver *phydrv = to_phy_driver(dev->driver);
	struct phy_device *phydev = to_phy_device(dev);

	/*
	 * We must stop the state machine manually, otherwise it stops out of
	 * control, possibly with the phydev->lock held. Upon resume, netdev
	 * may call phy routines that try to grab the same lock, and that may
	 * lead to a deadlock.
	 */
	if (phydev->attached_dev && phydev->adjust_link)
		phy_stop_machine(phydev);

	if (!mdio_bus_phy_may_suspend(phydev))
		return 0;

	return phydrv->suspend(phydev);
}

static int mdio_bus_resume(struct device *dev)
{
	struct phy_driver *phydrv = to_phy_driver(dev->driver);
	struct phy_device *phydev = to_phy_device(dev);
	int ret;

	if (!mdio_bus_phy_may_suspend(phydev))
		goto no_resume;

	ret = phydrv->resume(phydev);
	if (ret < 0)
		return ret;

no_resume:
	if (phydev->attached_dev && phydev->adjust_link)
		phy_start_machine(phydev, NULL);

	return 0;
}

static int mdio_bus_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;

	/* The PHY needs to renegotiate. */
	phydev->link = 0;
	phydev->state = PHY_UP;

	phy_start_machine(phydev, NULL);

	return 0;
}

static struct dev_pm_ops mdio_bus_pm_ops = {
	.suspend = mdio_bus_suspend,
	.resume = mdio_bus_resume,
	.freeze = mdio_bus_suspend,
	.thaw = mdio_bus_resume,
	.restore = mdio_bus_restore,
};

#define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops)

#else

#define MDIO_BUS_PM_OPS NULL

#endif /* CONFIG_PM */

struct bus_type mdio_bus_type = {
	.name		= "mdio_bus",
	.match		= mdio_bus_match,
	.pm		= MDIO_BUS_PM_OPS,
};
EXPORT_SYMBOL(mdio_bus_type);

int __init mdio_bus_init(void)
{
	int ret;

	ret = class_register(&mdio_bus_class);
	if (!ret) {
		ret = bus_register(&mdio_bus_type);
		if (ret)
			class_unregister(&mdio_bus_class);
	}

	return ret;
}

void mdio_bus_exit(void)
{
	class_unregister(&mdio_bus_class);
	bus_unregister(&mdio_bus_type);
}
Commit	Line	Data
00db8189 AF	1	/*
	2	* drivers/net/phy/mdio_bus.c
	3	*
	4	* MDIO Bus interface
	5	*
	6	* Author: Andy Fleming
	7	*
	8	* Copyright (c) 2004 Freescale Semiconductor, Inc.
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation; either version 2 of the License, or (at your
	13	* option) any later version.
	14	*
	15	*/
00db8189	16	#include <linux/kernel.h>
00db8189 AF	17	#include <linux/string.h>
	18	#include <linux/errno.h>
	19	#include <linux/unistd.h>
	20	#include <linux/slab.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/init.h>
	23	#include <linux/delay.h>
3d1e4db2	24	#include <linux/device.h>
00db8189 AF	25	#include <linux/netdevice.h>
	26	#include <linux/etherdevice.h>
	27	#include <linux/skbuff.h>
	28	#include <linux/spinlock.h>
	29	#include <linux/mm.h>
	30	#include <linux/module.h>
00db8189 AF	31	#include <linux/mii.h>
	32	#include <linux/ethtool.h>
	33	#include <linux/phy.h>
	34
	35	#include <asm/io.h>
	36	#include <asm/irq.h>
	37	#include <asm/uaccess.h>
	38
298cf9be	39	/**
eb8a54a7	40	* mdiobus_alloc_size - allocate a mii_bus structure
af58f1d6 RD	41	* @size: extra amount of memory to allocate for private storage.
af58f1d6 RD	42	* If non-zero, then bus->priv is points to that memory.
298cf9be LB	43	*
	44	* Description: called by a bus driver to allocate an mii_bus
	45	* structure to fill in.
	46	*/
eb8a54a7	47	struct mii_bus *mdiobus_alloc_size(size_t size)
298cf9be	48	{
46abc021	49	struct mii_bus *bus;
eb8a54a7 TT	50	size_t aligned_size = ALIGN(sizeof(*bus), NETDEV_ALIGN);
	51	size_t alloc_size;
	52
	53	/* If we alloc extra space, it should be aligned */
	54	if (size)
	55	alloc_size = aligned_size + size;
	56	else
	57	alloc_size = sizeof(*bus);
46abc021	58
eb8a54a7 TT	59	bus = kzalloc(alloc_size, GFP_KERNEL);
eb8a54a7 TT	60	if (bus) {
46abc021	61	bus->state = MDIOBUS_ALLOCATED;
eb8a54a7 TT	62	if (size)
	63	bus->priv = (void *)bus + aligned_size;
	64	}
46abc021 LB	65
46abc021 LB	66	return bus;
298cf9be	67	}
eb8a54a7	68	EXPORT_SYMBOL(mdiobus_alloc_size);
298cf9be	69
46abc021 LB	70	/**
46abc021 LB	71	* mdiobus_release - mii_bus device release callback
78c36b15	72	* @d: the target struct device that contains the mii_bus
46abc021 LB	73	*
	74	* Description: called when the last reference to an mii_bus is
	75	* dropped, to free the underlying memory.
	76	*/
	77	static void mdiobus_release(struct device *d)
	78	{
	79	struct mii_bus *bus = to_mii_bus(d);
161c8d2f KH	80	BUG_ON(bus->state != MDIOBUS_RELEASED &&
	81	/* for compatibility with error handling in drivers */
	82	bus->state != MDIOBUS_ALLOCATED);
46abc021 LB	83	kfree(bus);
	84	}
	85
	86	static struct class mdio_bus_class = {
	87	.name = "mdio_bus",
	88	.dev_release = mdiobus_release,
	89	};
	90
b943fbb0	91	#if IS_ENABLED(CONFIG_OF_MDIO)
25106022 DD	92	/* Helper function for of_mdio_find_bus */
	93	static int of_mdio_bus_match(struct device dev, void mdio_bus_np)
	94	{
	95	return dev->of_node == mdio_bus_np;
	96	}
	97	/**
	98	* of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
	99	* @mdio_np: Pointer to the mii_bus.
	100	*
	101	* Returns a pointer to the mii_bus, or NULL if none found.
	102	*
	103	* Because the association of a device_node and mii_bus is made via
	104	* of_mdiobus_register(), the mii_bus cannot be found before it is
	105	* registered with of_mdiobus_register().
	106	*
	107	*/
	108	struct mii_bus of_mdio_find_bus(struct device_node mdio_bus_np)
	109	{
	110	struct device *d;
	111
	112	if (!mdio_bus_np)
	113	return NULL;
	114
	115	d = class_find_device(&mdio_bus_class, NULL, mdio_bus_np,
	116	of_mdio_bus_match);
	117
	118	return d ? to_mii_bus(d) : NULL;
	119	}
	120	EXPORT_SYMBOL(of_mdio_find_bus);
	121	#endif
	122
b3df0da8 RD	123	/**
	124	* mdiobus_register - bring up all the PHYs on a given bus and attach them to bus
	125	* @bus: target mii_bus
e1393456	126	*
b3df0da8 RD	127	* Description: Called by a bus driver to bring up all the PHYs
	128	* on a given bus, and attach them to the bus.
	129	*
	130	* Returns 0 on success or < 0 on error.
e1393456 AF	131	*/
	132	int mdiobus_register(struct mii_bus *bus)
	133	{
161c8d2f	134	int i, err;
e1393456	135
e1393456 AF	136	if (NULL == bus \|\| NULL == bus->name \|\|
	137	NULL == bus->read \|\|
	138	NULL == bus->write)
	139	return -EINVAL;
	140
46abc021 LB	141	BUG_ON(bus->state != MDIOBUS_ALLOCATED &&
	142	bus->state != MDIOBUS_UNREGISTERED);
	143
	144	bus->dev.parent = bus->parent;
	145	bus->dev.class = &mdio_bus_class;
	146	bus->dev.groups = NULL;
036b6687	147	dev_set_name(&bus->dev, "%s", bus->id);
46abc021 LB	148
	149	err = device_register(&bus->dev);
	150	if (err) {
	151	printk(KERN_ERR "mii_bus %s failed to register\n", bus->id);
	152	return -EINVAL;
	153	}
	154
d1e7fe4d AB	155	mutex_init(&bus->mdio_lock);
d1e7fe4d AB	156
e1393456 AF	157	if (bus->reset)
	158	bus->reset(bus);
	159
	160	for (i = 0; i < PHY_MAX_ADDR; i++) {
4fd5f812 LB	161	if ((bus->phy_mask & (1 << i)) == 0) {
4fd5f812 LB	162	struct phy_device *phydev;
e1393456	163
4fd5f812	164	phydev = mdiobus_scan(bus, i);
161c8d2f	165	if (IS_ERR(phydev)) {
4fd5f812	166	err = PTR_ERR(phydev);
161c8d2f KH	167	goto error;
161c8d2f KH	168	}
64b1c2b4	169	}
e1393456 AF	170	}
e1393456 AF	171
161c8d2f	172	bus->state = MDIOBUS_REGISTERED;
e1393456	173	pr_info("%s: probed\n", bus->name);
161c8d2f	174	return 0;
e1393456	175
161c8d2f KH	176	error:
	177	while (--i >= 0) {
	178	if (bus->phy_map[i])
	179	device_unregister(&bus->phy_map[i]->dev);
	180	}
	181	device_del(&bus->dev);
e1393456 AF	182	return err;
	183	}
	184	EXPORT_SYMBOL(mdiobus_register);
	185
	186	void mdiobus_unregister(struct mii_bus *bus)
	187	{
	188	int i;
	189
46abc021 LB	190	BUG_ON(bus->state != MDIOBUS_REGISTERED);
	191	bus->state = MDIOBUS_UNREGISTERED;
	192
3e44017b	193	device_del(&bus->dev);
e1393456	194	for (i = 0; i < PHY_MAX_ADDR; i++) {
6f4a7f41	195	if (bus->phy_map[i])
e1393456	196	device_unregister(&bus->phy_map[i]->dev);
4dea547f	197	bus->phy_map[i] = NULL;
e1393456 AF	198	}
	199	}
	200	EXPORT_SYMBOL(mdiobus_unregister);
	201
298cf9be LB	202	/**
	203	* mdiobus_free - free a struct mii_bus
	204	* @bus: mii_bus to free
	205	*
46abc021 LB	206	* This function releases the reference to the underlying device
	207	* object in the mii_bus. If this is the last reference, the mii_bus
	208	* will be freed.
298cf9be LB	209	*/
	210	void mdiobus_free(struct mii_bus *bus)
	211	{
46abc021 LB	212	/*
	213	* For compatibility with error handling in drivers.
	214	*/
	215	if (bus->state == MDIOBUS_ALLOCATED) {
	216	kfree(bus);
	217	return;
	218	}
	219
	220	BUG_ON(bus->state != MDIOBUS_UNREGISTERED);
	221	bus->state = MDIOBUS_RELEASED;
	222
	223	put_device(&bus->dev);
298cf9be LB	224	}
	225	EXPORT_SYMBOL(mdiobus_free);
	226
4fd5f812 LB	227	struct phy_device mdiobus_scan(struct mii_bus bus, int addr)
	228	{
	229	struct phy_device *phydev;
	230	int err;
	231
	232	phydev = get_phy_device(bus, addr);
	233	if (IS_ERR(phydev) \|\| phydev == NULL)
	234	return phydev;
	235
4dea547f	236	err = phy_device_register(phydev);
4fd5f812	237	if (err) {
4fd5f812	238	phy_device_free(phydev);
4dea547f	239	return NULL;
4fd5f812 LB	240	}
4fd5f812 LB	241
4fd5f812 LB	242	return phydev;
	243	}
	244	EXPORT_SYMBOL(mdiobus_scan);
	245
2e888103 LB	246	/**
	247	* mdiobus_read - Convenience function for reading a given MII mgmt register
	248	* @bus: the mii_bus struct
	249	* @addr: the phy address
	250	* @regnum: register number to read
	251	*
	252	* NOTE: MUST NOT be called from interrupt context,
	253	* because the bus read/write functions may wait for an interrupt
	254	* to conclude the operation.
	255	*/
abf35df2	256	int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum)
2e888103 LB	257	{
	258	int retval;
	259
	260	BUG_ON(in_interrupt());
	261
	262	mutex_lock(&bus->mdio_lock);
	263	retval = bus->read(bus, addr, regnum);
	264	mutex_unlock(&bus->mdio_lock);
	265
	266	return retval;
	267	}
	268	EXPORT_SYMBOL(mdiobus_read);
	269
	270	/**
	271	* mdiobus_write - Convenience function for writing a given MII mgmt register
	272	* @bus: the mii_bus struct
	273	* @addr: the phy address
	274	* @regnum: register number to write
	275	* @val: value to write to @regnum
	276	*
	277	* NOTE: MUST NOT be called from interrupt context,
	278	* because the bus read/write functions may wait for an interrupt
	279	* to conclude the operation.
	280	*/
abf35df2	281	int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val)
2e888103 LB	282	{
	283	int err;
	284
	285	BUG_ON(in_interrupt());
	286
	287	mutex_lock(&bus->mdio_lock);
	288	err = bus->write(bus, addr, regnum, val);
	289	mutex_unlock(&bus->mdio_lock);
	290
	291	return err;
	292	}
	293	EXPORT_SYMBOL(mdiobus_write);
	294
b3df0da8 RD	295	/**
	296	* mdio_bus_match - determine if given PHY driver supports the given PHY device
	297	* @dev: target PHY device
	298	* @drv: given PHY driver
00db8189	299	*
b3df0da8 RD	300	* Description: Given a PHY device, and a PHY driver, return 1 if
b3df0da8 RD	301	* the driver supports the device. Otherwise, return 0.
00db8189 AF	302	*/
	303	static int mdio_bus_match(struct device dev, struct device_driver drv)
	304	{
	305	struct phy_device *phydev = to_phy_device(dev);
	306	struct phy_driver *phydrv = to_phy_driver(drv);
	307
5f708dd9 KG	308	return ((phydrv->phy_id & phydrv->phy_id_mask) ==
5f708dd9 KG	309	(phydev->phy_id & phydrv->phy_id_mask));
00db8189 AF	310	}
00db8189 AF	311
2f5cb434 AV	312	#ifdef CONFIG_PM
2f5cb434 AV	313
3d1e4db2 AV	314	static bool mdio_bus_phy_may_suspend(struct phy_device *phydev)
	315	{
	316	struct device_driver *drv = phydev->dev.driver;
	317	struct phy_driver *phydrv = to_phy_driver(drv);
	318	struct net_device *netdev = phydev->attached_dev;
	319
	320	if (!drv \|\| !phydrv->suspend)
	321	return false;
	322
	323	/* PHY not attached? May suspend. */
	324	if (!netdev)
	325	return true;
	326
	327	/*
	328	* Don't suspend PHY if the attched netdev parent may wakeup.
	329	* The parent may point to a PCI device, as in tg3 driver.
	330	*/
	331	if (netdev->dev.parent && device_may_wakeup(netdev->dev.parent))
	332	return false;
	333
	334	/*
	335	* Also don't suspend PHY if the netdev itself may wakeup. This
	336	* is the case for devices w/o underlaying pwr. mgmt. aware bus,
	337	* e.g. SoC devices.
	338	*/
	339	if (device_may_wakeup(&netdev->dev))
	340	return false;
	341
	342	return true;
	343	}
	344
2f5cb434	345	static int mdio_bus_suspend(struct device *dev)
00db8189	346	{
3d1e4db2	347	struct phy_driver *phydrv = to_phy_driver(dev->driver);
0f0ca340	348	struct phy_device *phydev = to_phy_device(dev);
00db8189	349
541cd3ee AV	350	/*
	351	* We must stop the state machine manually, otherwise it stops out of
	352	* control, possibly with the phydev->lock held. Upon resume, netdev
	353	* may call phy routines that try to grab the same lock, and that may
	354	* lead to a deadlock.
	355	*/
fddd9101	356	if (phydev->attached_dev && phydev->adjust_link)
541cd3ee AV	357	phy_stop_machine(phydev);
541cd3ee AV	358
3d1e4db2 AV	359	if (!mdio_bus_phy_may_suspend(phydev))
3d1e4db2 AV	360	return 0;
541cd3ee	361
3d1e4db2	362	return phydrv->suspend(phydev);
00db8189 AF	363	}
00db8189 AF	364
2f5cb434	365	static int mdio_bus_resume(struct device *dev)
00db8189	366	{
3d1e4db2	367	struct phy_driver *phydrv = to_phy_driver(dev->driver);
0f0ca340	368	struct phy_device *phydev = to_phy_device(dev);
541cd3ee	369	int ret;
00db8189	370
3d1e4db2	371	if (!mdio_bus_phy_may_suspend(phydev))
541cd3ee AV	372	goto no_resume;
	373
	374	ret = phydrv->resume(phydev);
	375	if (ret < 0)
	376	return ret;
	377
	378	no_resume:
fddd9101	379	if (phydev->attached_dev && phydev->adjust_link)
541cd3ee AV	380	phy_start_machine(phydev, NULL);
	381
	382	return 0;
00db8189 AF	383	}
00db8189 AF	384
2f5cb434 AV	385	static int mdio_bus_restore(struct device *dev)
	386	{
	387	struct phy_device *phydev = to_phy_device(dev);
	388	struct net_device *netdev = phydev->attached_dev;
	389	int ret;
	390
	391	if (!netdev)
	392	return 0;
	393
	394	ret = phy_init_hw(phydev);
	395	if (ret < 0)
	396	return ret;
	397
	398	/* The PHY needs to renegotiate. */
	399	phydev->link = 0;
	400	phydev->state = PHY_UP;
	401
	402	phy_start_machine(phydev, NULL);
	403
	404	return 0;
	405	}
	406
	407	static struct dev_pm_ops mdio_bus_pm_ops = {
	408	.suspend = mdio_bus_suspend,
	409	.resume = mdio_bus_resume,
	410	.freeze = mdio_bus_suspend,
	411	.thaw = mdio_bus_resume,
	412	.restore = mdio_bus_restore,
	413	};
	414
	415	#define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops)
	416
	417	#else
	418
	419	#define MDIO_BUS_PM_OPS NULL
	420
	421	#endif /* CONFIG_PM */
	422
00db8189 AF	423	struct bus_type mdio_bus_type = {
	424	.name = "mdio_bus",
	425	.match = mdio_bus_match,
2f5cb434	426	.pm = MDIO_BUS_PM_OPS,
00db8189	427	};
11b0bacd	428	EXPORT_SYMBOL(mdio_bus_type);
00db8189	429
67c4f3fa	430	int __init mdio_bus_init(void)
00db8189	431	{
46abc021 LB	432	int ret;
	433
	434	ret = class_register(&mdio_bus_class);
	435	if (!ret) {
	436	ret = bus_register(&mdio_bus_type);
	437	if (ret)
	438	class_unregister(&mdio_bus_class);
	439	}
	440
	441	return ret;
00db8189 AF	442	}
00db8189 AF	443
dc85dec6	444	void mdio_bus_exit(void)
e1393456	445	{
46abc021	446	class_unregister(&mdio_bus_class);
e1393456 AF	447	bus_unregister(&mdio_bus_type);
e1393456 AF	448	}