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

/*
 * Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
 *
 * Author: Vitaly Bordug <vbordug@ru.mvista.com>
 *         Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * Copyright (c) 2006-2007 MontaVista Software, 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/module.h>
#include <linux/platform_device.h>
#include <linux/list.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/gpio.h>

#define MII_REGS_NUM 29

struct fixed_mdio_bus {
	struct mii_bus *mii_bus;
	struct list_head phys;
};

struct fixed_phy {
	int addr;
	u16 regs[MII_REGS_NUM];
	struct phy_device *phydev;
	struct fixed_phy_status status;
	int (*link_update)(struct net_device *, struct fixed_phy_status *);
	struct list_head node;
	int link_gpio;
};

static struct platform_device *pdev;
static struct fixed_mdio_bus platform_fmb = {
	.phys = LIST_HEAD_INIT(platform_fmb.phys),
};

static int fixed_phy_update_regs(struct fixed_phy *fp)
{
	u16 bmsr = BMSR_ANEGCAPABLE;
	u16 bmcr = 0;
	u16 lpagb = 0;
	u16 lpa = 0;

	if (gpio_is_valid(fp->link_gpio))
		fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);

	if (fp->status.duplex) {
		switch (fp->status.speed) {
		case 1000:
			bmsr |= BMSR_ESTATEN;
			break;
		case 100:
			bmsr |= BMSR_100FULL;
			break;
		case 10:
			bmsr |= BMSR_10FULL;
			break;
		default:
			break;
		}
	} else {
		switch (fp->status.speed) {
		case 1000:
			bmsr |= BMSR_ESTATEN;
			break;
		case 100:
			bmsr |= BMSR_100HALF;
			break;
		case 10:
			bmsr |= BMSR_10HALF;
			break;
		default:
			break;
		}
	}

	if (fp->status.link) {
		bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;

		if (fp->status.duplex) {
			bmcr |= BMCR_FULLDPLX;

			switch (fp->status.speed) {
			case 1000:
				bmcr |= BMCR_SPEED1000;
				lpagb |= LPA_1000FULL;
				break;
			case 100:
				bmcr |= BMCR_SPEED100;
				lpa |= LPA_100FULL;
				break;
			case 10:
				lpa |= LPA_10FULL;
				break;
			default:
				pr_warn("fixed phy: unknown speed\n");
				return -EINVAL;
			}
		} else {
			switch (fp->status.speed) {
			case 1000:
				bmcr |= BMCR_SPEED1000;
				lpagb |= LPA_1000HALF;
				break;
			case 100:
				bmcr |= BMCR_SPEED100;
				lpa |= LPA_100HALF;
				break;
			case 10:
				lpa |= LPA_10HALF;
				break;
			default:
				pr_warn("fixed phy: unknown speed\n");
			return -EINVAL;
			}
		}

		if (fp->status.pause)
			lpa |= LPA_PAUSE_CAP;

		if (fp->status.asym_pause)
			lpa |= LPA_PAUSE_ASYM;
	}

	fp->regs[MII_PHYSID1] = 0;
	fp->regs[MII_PHYSID2] = 0;

	fp->regs[MII_BMSR] = bmsr;
	fp->regs[MII_BMCR] = bmcr;
	fp->regs[MII_LPA] = lpa;
	fp->regs[MII_STAT1000] = lpagb;

	return 0;
}

static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
{
	struct fixed_mdio_bus *fmb = bus->priv;
	struct fixed_phy *fp;

	if (reg_num >= MII_REGS_NUM)
		return -1;

	/* We do not support emulating Clause 45 over Clause 22 register reads
	 * return an error instead of bogus data.
	 */
	switch (reg_num) {
	case MII_MMD_CTRL:
	case MII_MMD_DATA:
		return -1;
	default:
		break;
	}

	list_for_each_entry(fp, &fmb->phys, node) {
		if (fp->addr == phy_addr) {
			/* Issue callback if user registered it. */
			if (fp->link_update) {
				fp->link_update(fp->phydev->attached_dev,
						&fp->status);
				fixed_phy_update_regs(fp);
			}
			return fp->regs[reg_num];
		}
	}

	return 0xFFFF;
}

static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
			    u16 val)
{
	return 0;
}

/*
 * If something weird is required to be done with link/speed,
 * network driver is able to assign a function to implement this.
 * May be useful for PHY's that need to be software-driven.
 */
int fixed_phy_set_link_update(struct phy_device *phydev,
			      int (*link_update)(struct net_device *,
						 struct fixed_phy_status *))
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp;

	if (!phydev || !phydev->mdio.bus)
		return -EINVAL;

	list_for_each_entry(fp, &fmb->phys, node) {
		if (fp->addr == phydev->mdio.addr) {
			fp->link_update = link_update;
			fp->phydev = phydev;
			return 0;
		}
	}

	return -ENOENT;
}
EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);

int fixed_phy_update_state(struct phy_device *phydev,
			   const struct fixed_phy_status *status,
			   const struct fixed_phy_status *changed)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp;

	if (!phydev || phydev->mdio.bus != fmb->mii_bus)
		return -EINVAL;

	list_for_each_entry(fp, &fmb->phys, node) {
		if (fp->addr == phydev->mdio.addr) {
#define _UPD(x) if (changed->x) \
	fp->status.x = status->x
			_UPD(link);
			_UPD(speed);
			_UPD(duplex);
			_UPD(pause);
			_UPD(asym_pause);
#undef _UPD
			fixed_phy_update_regs(fp);
			return 0;
		}
	}

	return -ENOENT;
}
EXPORT_SYMBOL(fixed_phy_update_state);

int fixed_phy_add(unsigned int irq, int phy_addr,
		  struct fixed_phy_status *status,
		  int link_gpio)
{
	int ret;
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp;

	fp = kzalloc(sizeof(*fp), GFP_KERNEL);
	if (!fp)
		return -ENOMEM;

	memset(fp->regs, 0xFF,  sizeof(fp->regs[0]) * MII_REGS_NUM);

	if (irq != PHY_POLL)
		fmb->mii_bus->irq[phy_addr] = irq;

	fp->addr = phy_addr;
	fp->status = *status;
	fp->link_gpio = link_gpio;

	if (gpio_is_valid(fp->link_gpio)) {
		ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
				       "fixed-link-gpio-link");
		if (ret)
			goto err_regs;
	}

	ret = fixed_phy_update_regs(fp);
	if (ret)
		goto err_gpio;

	list_add_tail(&fp->node, &fmb->phys);

	return 0;

err_gpio:
	if (gpio_is_valid(fp->link_gpio))
		gpio_free(fp->link_gpio);
err_regs:
	kfree(fp);
	return ret;
}
EXPORT_SYMBOL_GPL(fixed_phy_add);

static void fixed_phy_del(int phy_addr)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp, *tmp;

	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
		if (fp->addr == phy_addr) {
			list_del(&fp->node);
			if (gpio_is_valid(fp->link_gpio))
				gpio_free(fp->link_gpio);
			kfree(fp);
			return;
		}
	}
}

static int phy_fixed_addr;
static DEFINE_SPINLOCK(phy_fixed_addr_lock);

struct phy_device *fixed_phy_register(unsigned int irq,
				      struct fixed_phy_status *status,
				      int link_gpio,
				      struct device_node *np)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct phy_device *phy;
	int phy_addr;
	int ret;

	if (!fmb->mii_bus || fmb->mii_bus->state != MDIOBUS_REGISTERED)
		return ERR_PTR(-EPROBE_DEFER);

	/* Get the next available PHY address, up to PHY_MAX_ADDR */
	spin_lock(&phy_fixed_addr_lock);
	if (phy_fixed_addr == PHY_MAX_ADDR) {
		spin_unlock(&phy_fixed_addr_lock);
		return ERR_PTR(-ENOSPC);
	}
	phy_addr = phy_fixed_addr++;
	spin_unlock(&phy_fixed_addr_lock);

	ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
	if (ret < 0)
		return ERR_PTR(ret);

	phy = get_phy_device(fmb->mii_bus, phy_addr, false);
	if (IS_ERR(phy)) {
		fixed_phy_del(phy_addr);
		return ERR_PTR(-EINVAL);
	}

	/* propagate the fixed link values to struct phy_device */
	phy->link = status->link;
	if (status->link) {
		phy->speed = status->speed;
		phy->duplex = status->duplex;
		phy->pause = status->pause;
		phy->asym_pause = status->asym_pause;
	}

	of_node_get(np);
	phy->mdio.dev.of_node = np;
	phy->is_pseudo_fixed_link = true;

	switch (status->speed) {
	case SPEED_1000:
		phy->supported = PHY_1000BT_FEATURES;
		break;
	case SPEED_100:
		phy->supported = PHY_100BT_FEATURES;
		break;
	case SPEED_10:
	default:
		phy->supported = PHY_10BT_FEATURES;
	}

	ret = phy_device_register(phy);
	if (ret) {
		phy_device_free(phy);
		of_node_put(np);
		fixed_phy_del(phy_addr);
		return ERR_PTR(ret);
	}

	return phy;
}
EXPORT_SYMBOL_GPL(fixed_phy_register);

void fixed_phy_unregister(struct phy_device *phy)
{
	phy_device_remove(phy);

	fixed_phy_del(phy->mdio.addr);
}
EXPORT_SYMBOL_GPL(fixed_phy_unregister);

static int __init fixed_mdio_bus_init(void)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	int ret;

	pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
	if (IS_ERR(pdev)) {
		ret = PTR_ERR(pdev);
		goto err_pdev;
	}

	fmb->mii_bus = mdiobus_alloc();
	if (fmb->mii_bus == NULL) {
		ret = -ENOMEM;
		goto err_mdiobus_reg;
	}

	snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
	fmb->mii_bus->name = "Fixed MDIO Bus";
	fmb->mii_bus->priv = fmb;
	fmb->mii_bus->parent = &pdev->dev;
	fmb->mii_bus->read = &fixed_mdio_read;
	fmb->mii_bus->write = &fixed_mdio_write;

	ret = mdiobus_register(fmb->mii_bus);
	if (ret)
		goto err_mdiobus_alloc;

	return 0;

err_mdiobus_alloc:
	mdiobus_free(fmb->mii_bus);
err_mdiobus_reg:
	platform_device_unregister(pdev);
err_pdev:
	return ret;
}
module_init(fixed_mdio_bus_init);

static void __exit fixed_mdio_bus_exit(void)
{
	struct fixed_mdio_bus *fmb = &platform_fmb;
	struct fixed_phy *fp, *tmp;

	mdiobus_unregister(fmb->mii_bus);
	mdiobus_free(fmb->mii_bus);
	platform_device_unregister(pdev);

	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
		list_del(&fp->node);
		kfree(fp);
	}
}
module_exit(fixed_mdio_bus_exit);

MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
MODULE_AUTHOR("Vitaly Bordug");
MODULE_LICENSE("GPL");
Commit	Line	Data
11b0bacd	1	/*
a79d8e93	2	* Fixed MDIO bus (MDIO bus emulation with fixed PHYs)
11b0bacd	3	*
a79d8e93 VB	4	* Author: Vitaly Bordug <vbordug@ru.mvista.com>
a79d8e93 VB	5	* Anton Vorontsov <avorontsov@ru.mvista.com>
11b0bacd	6	*
a79d8e93	7	* Copyright (c) 2006-2007 MontaVista Software, Inc.
11b0bacd VB	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
11b0bacd	13	*/
a79d8e93	14
11b0bacd	15	#include <linux/kernel.h>
11b0bacd	16	#include <linux/module.h>
a79d8e93 VB	17	#include <linux/platform_device.h>
a79d8e93 VB	18	#include <linux/list.h>
11b0bacd	19	#include <linux/mii.h>
11b0bacd	20	#include <linux/phy.h>
7c32f470	21	#include <linux/phy_fixed.h>
57401d5e	22	#include <linux/err.h>
5a0e3ad6	23	#include <linux/slab.h>
a7595121	24	#include <linux/of.h>
a5597008	25	#include <linux/gpio.h>
11b0bacd	26
a79d8e93	27	#define MII_REGS_NUM 29
11b0bacd	28
a79d8e93	29	struct fixed_mdio_bus {
298cf9be	30	struct mii_bus *mii_bus;
a79d8e93 VB	31	struct list_head phys;
a79d8e93 VB	32	};
11b0bacd	33
a79d8e93	34	struct fixed_phy {
9b744942	35	int addr;
a79d8e93 VB	36	u16 regs[MII_REGS_NUM];
	37	struct phy_device *phydev;
	38	struct fixed_phy_status status;
	39	int (link_update)(struct net_device , struct fixed_phy_status *);
	40	struct list_head node;
a5597008	41	int link_gpio;
a79d8e93	42	};
7c32f470	43
a79d8e93 VB	44	static struct platform_device *pdev;
	45	static struct fixed_mdio_bus platform_fmb = {
	46	.phys = LIST_HEAD_INIT(platform_fmb.phys),
	47	};
7c32f470	48
a79d8e93	49	static int fixed_phy_update_regs(struct fixed_phy *fp)
11b0bacd	50	{
a79d8e93	51	u16 bmsr = BMSR_ANEGCAPABLE;
11b0bacd	52	u16 bmcr = 0;
a79d8e93 VB	53	u16 lpagb = 0;
a79d8e93 VB	54	u16 lpa = 0;
11b0bacd	55
a5597008 AL	56	if (gpio_is_valid(fp->link_gpio))
	57	fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
	58
a79d8e93	59	if (fp->status.duplex) {
a79d8e93 VB	60	switch (fp->status.speed) {
	61	case 1000:
	62	bmsr \|= BMSR_ESTATEN;
a79d8e93	63	break;
11b0bacd VB	64	case 100:
11b0bacd VB	65	bmsr \|= BMSR_100FULL;
7c32f470	66	break;
11b0bacd VB	67	case 10:
11b0bacd VB	68	bmsr \|= BMSR_10FULL;
7c32f470	69	break;
a79d8e93	70	default:
bc0f4a87	71	break;
11b0bacd VB	72	}
11b0bacd VB	73	} else {
a79d8e93 VB	74	switch (fp->status.speed) {
	75	case 1000:
	76	bmsr \|= BMSR_ESTATEN;
a79d8e93	77	break;
11b0bacd VB	78	case 100:
11b0bacd VB	79	bmsr \|= BMSR_100HALF;
7c32f470	80	break;
11b0bacd	81	case 10:
a79d8e93	82	bmsr \|= BMSR_10HALF;
7c32f470	83	break;
a79d8e93	84	default:
bc0f4a87	85	break;
11b0bacd VB	86	}
	87	}
	88
bc0f4a87 AL	89	if (fp->status.link) {
	90	bmsr \|= BMSR_LSTATUS \| BMSR_ANEGCOMPLETE;
	91
	92	if (fp->status.duplex) {
	93	bmcr \|= BMCR_FULLDPLX;
	94
	95	switch (fp->status.speed) {
	96	case 1000:
	97	bmcr \|= BMCR_SPEED1000;
	98	lpagb \|= LPA_1000FULL;
	99	break;
	100	case 100:
	101	bmcr \|= BMCR_SPEED100;
	102	lpa \|= LPA_100FULL;
	103	break;
	104	case 10:
	105	lpa \|= LPA_10FULL;
	106	break;
	107	default:
	108	pr_warn("fixed phy: unknown speed\n");
	109	return -EINVAL;
	110	}
	111	} else {
	112	switch (fp->status.speed) {
	113	case 1000:
	114	bmcr \|= BMCR_SPEED1000;
	115	lpagb \|= LPA_1000HALF;
	116	break;
	117	case 100:
	118	bmcr \|= BMCR_SPEED100;
	119	lpa \|= LPA_100HALF;
	120	break;
	121	case 10:
	122	lpa \|= LPA_10HALF;
	123	break;
	124	default:
	125	pr_warn("fixed phy: unknown speed\n");
	126	return -EINVAL;
	127	}
	128	}
a79d8e93	129
bc0f4a87 AL	130	if (fp->status.pause)
	131	lpa \|= LPA_PAUSE_CAP;
	132
	133	if (fp->status.asym_pause)
	134	lpa \|= LPA_PAUSE_ASYM;
	135	}
a79d8e93	136
9b744942 TP	137	fp->regs[MII_PHYSID1] = 0;
9b744942 TP	138	fp->regs[MII_PHYSID2] = 0;
a79d8e93 VB	139
	140	fp->regs[MII_BMSR] = bmsr;
	141	fp->regs[MII_BMCR] = bmcr;
	142	fp->regs[MII_LPA] = lpa;
	143	fp->regs[MII_STAT1000] = lpagb;
11b0bacd VB	144
	145	return 0;
	146	}
	147
9b744942	148	static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
11b0bacd	149	{
ec2a5652	150	struct fixed_mdio_bus *fmb = bus->priv;
a79d8e93 VB	151	struct fixed_phy *fp;
	152
	153	if (reg_num >= MII_REGS_NUM)
	154	return -1;
	155
a2dbba76 FF	156	/* We do not support emulating Clause 45 over Clause 22 register reads
	157	* return an error instead of bogus data.
	158	*/
	159	switch (reg_num) {
	160	case MII_MMD_CTRL:
	161	case MII_MMD_DATA:
	162	return -1;
	163	default:
	164	break;
	165	}
	166
a79d8e93	167	list_for_each_entry(fp, &fmb->phys, node) {
9b744942	168	if (fp->addr == phy_addr) {
a79d8e93 VB	169	/* Issue callback if user registered it. */
	170	if (fp->link_update) {
	171	fp->link_update(fp->phydev->attached_dev,
	172	&fp->status);
	173	fixed_phy_update_regs(fp);
11b0bacd	174	}
a79d8e93	175	return fp->regs[reg_num];
7c32f470	176	}
a79d8e93	177	}
11b0bacd	178
a79d8e93	179	return 0xFFFF;
11b0bacd VB	180	}
11b0bacd VB	181
9b744942	182	static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
a79d8e93	183	u16 val)
11b0bacd	184	{
11b0bacd VB	185	return 0;
	186	}
	187
a79d8e93 VB	188	/*
	189	* If something weird is required to be done with link/speed,
	190	* network driver is able to assign a function to implement this.
	191	* May be useful for PHY's that need to be software-driven.
	192	*/
	193	int fixed_phy_set_link_update(struct phy_device *phydev,
	194	int (link_update)(struct net_device ,
	195	struct fixed_phy_status *))
11b0bacd	196	{
a79d8e93 VB	197	struct fixed_mdio_bus *fmb = &platform_fmb;
a79d8e93 VB	198	struct fixed_phy *fp;
11b0bacd	199
e5a03bfd	200	if (!phydev \|\| !phydev->mdio.bus)
a79d8e93	201	return -EINVAL;
11b0bacd	202
a79d8e93	203	list_for_each_entry(fp, &fmb->phys, node) {
e5a03bfd	204	if (fp->addr == phydev->mdio.addr) {
a79d8e93 VB	205	fp->link_update = link_update;
	206	fp->phydev = phydev;
	207	return 0;
	208	}
	209	}
11b0bacd	210
a79d8e93	211	return -ENOENT;
7c32f470	212	}
a79d8e93	213	EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
7c32f470	214
a3bebdce SS	215	int fixed_phy_update_state(struct phy_device *phydev,
	216	const struct fixed_phy_status *status,
	217	const struct fixed_phy_status *changed)
	218	{
	219	struct fixed_mdio_bus *fmb = &platform_fmb;
	220	struct fixed_phy *fp;
	221
e5a03bfd	222	if (!phydev \|\| phydev->mdio.bus != fmb->mii_bus)
a3bebdce SS	223	return -EINVAL;
	224
	225	list_for_each_entry(fp, &fmb->phys, node) {
e5a03bfd	226	if (fp->addr == phydev->mdio.addr) {
a3bebdce SS	227	#define _UPD(x) if (changed->x) \
	228	fp->status.x = status->x
	229	_UPD(link);
	230	_UPD(speed);
	231	_UPD(duplex);
	232	_UPD(pause);
	233	_UPD(asym_pause);
	234	#undef _UPD
	235	fixed_phy_update_regs(fp);
	236	return 0;
	237	}
	238	}
	239
	240	return -ENOENT;
	241	}
	242	EXPORT_SYMBOL(fixed_phy_update_state);
	243
9b744942	244	int fixed_phy_add(unsigned int irq, int phy_addr,
a5597008 AL	245	struct fixed_phy_status *status,
a5597008 AL	246	int link_gpio)
11b0bacd	247	{
a79d8e93 VB	248	int ret;
	249	struct fixed_mdio_bus *fmb = &platform_fmb;
	250	struct fixed_phy *fp;
11b0bacd	251
a79d8e93 VB	252	fp = kzalloc(sizeof(*fp), GFP_KERNEL);
	253	if (!fp)
	254	return -ENOMEM;
11b0bacd	255
a79d8e93	256	memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
11b0bacd	257
185be5ae RV	258	if (irq != PHY_POLL)
185be5ae RV	259	fmb->mii_bus->irq[phy_addr] = irq;
11b0bacd	260
9b744942	261	fp->addr = phy_addr;
a79d8e93	262	fp->status = *status;
a5597008 AL	263	fp->link_gpio = link_gpio;
	264
	265	if (gpio_is_valid(fp->link_gpio)) {
	266	ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
	267	"fixed-link-gpio-link");
	268	if (ret)
	269	goto err_regs;
	270	}
7c32f470	271
a79d8e93 VB	272	ret = fixed_phy_update_regs(fp);
a79d8e93 VB	273	if (ret)
a5597008	274	goto err_gpio;
11b0bacd	275
a79d8e93	276	list_add_tail(&fp->node, &fmb->phys);
7c32f470	277
a79d8e93	278	return 0;
11b0bacd	279
a5597008 AL	280	err_gpio:
	281	if (gpio_is_valid(fp->link_gpio))
	282	gpio_free(fp->link_gpio);
a79d8e93 VB	283	err_regs:
	284	kfree(fp);
	285	return ret;
	286	}
	287	EXPORT_SYMBOL_GPL(fixed_phy_add);
11b0bacd	288
5bcbe0f3	289	static void fixed_phy_del(int phy_addr)
a7595121 TP	290	{
	291	struct fixed_mdio_bus *fmb = &platform_fmb;
	292	struct fixed_phy fp, tmp;
	293
	294	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
	295	if (fp->addr == phy_addr) {
	296	list_del(&fp->node);
a5597008 AL	297	if (gpio_is_valid(fp->link_gpio))
a5597008 AL	298	gpio_free(fp->link_gpio);
a7595121 TP	299	kfree(fp);
	300	return;
	301	}
	302	}
	303	}
a7595121 TP	304
	305	static int phy_fixed_addr;
	306	static DEFINE_SPINLOCK(phy_fixed_addr_lock);
	307
fd2ef0ba PG	308	struct phy_device *fixed_phy_register(unsigned int irq,
fd2ef0ba PG	309	struct fixed_phy_status *status,
a5597008	310	int link_gpio,
fd2ef0ba	311	struct device_node *np)
a7595121 TP	312	{
	313	struct fixed_mdio_bus *fmb = &platform_fmb;
	314	struct phy_device *phy;
	315	int phy_addr;
	316	int ret;
	317
185be5ae RV	318	if (!fmb->mii_bus \|\| fmb->mii_bus->state != MDIOBUS_REGISTERED)
	319	return ERR_PTR(-EPROBE_DEFER);
	320
a7595121 TP	321	/* Get the next available PHY address, up to PHY_MAX_ADDR */
	322	spin_lock(&phy_fixed_addr_lock);
	323	if (phy_fixed_addr == PHY_MAX_ADDR) {
	324	spin_unlock(&phy_fixed_addr_lock);
fd2ef0ba	325	return ERR_PTR(-ENOSPC);
a7595121 TP	326	}
	327	phy_addr = phy_fixed_addr++;
	328	spin_unlock(&phy_fixed_addr_lock);
	329
bd1a05ee	330	ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
a7595121	331	if (ret < 0)
fd2ef0ba	332	return ERR_PTR(ret);
a7595121 TP	333
a7595121 TP	334	phy = get_phy_device(fmb->mii_bus, phy_addr, false);
4914a584	335	if (IS_ERR(phy)) {
a7595121	336	fixed_phy_del(phy_addr);
fd2ef0ba	337	return ERR_PTR(-EINVAL);
a7595121 TP	338	}
a7595121 TP	339
4b195360 MB	340	/* propagate the fixed link values to struct phy_device */
	341	phy->link = status->link;
	342	if (status->link) {
	343	phy->speed = status->speed;
	344	phy->duplex = status->duplex;
	345	phy->pause = status->pause;
	346	phy->asym_pause = status->asym_pause;
	347	}
	348
a7595121	349	of_node_get(np);
e5a03bfd	350	phy->mdio.dev.of_node = np;
5a11dd7d	351	phy->is_pseudo_fixed_link = true;
a7595121	352
34b31da4 AL	353	switch (status->speed) {
	354	case SPEED_1000:
	355	phy->supported = PHY_1000BT_FEATURES;
	356	break;
	357	case SPEED_100:
	358	phy->supported = PHY_100BT_FEATURES;
	359	break;
	360	case SPEED_10:
	361	default:
	362	phy->supported = PHY_10BT_FEATURES;
	363	}
	364
a7595121 TP	365	ret = phy_device_register(phy);
	366	if (ret) {
	367	phy_device_free(phy);
	368	of_node_put(np);
	369	fixed_phy_del(phy_addr);
fd2ef0ba	370	return ERR_PTR(ret);
a7595121 TP	371	}
a7595121 TP	372
fd2ef0ba	373	return phy;
a7595121	374	}
37e9a690	375	EXPORT_SYMBOL_GPL(fixed_phy_register);
a7595121	376
5bcbe0f3 AL	377	void fixed_phy_unregister(struct phy_device *phy)
	378	{
	379	phy_device_remove(phy);
	380
	381	fixed_phy_del(phy->mdio.addr);
	382	}
	383	EXPORT_SYMBOL_GPL(fixed_phy_unregister);
	384
a79d8e93 VB	385	static int __init fixed_mdio_bus_init(void)
	386	{
	387	struct fixed_mdio_bus *fmb = &platform_fmb;
	388	int ret;
11b0bacd	389
a79d8e93	390	pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
57401d5e DC	391	if (IS_ERR(pdev)) {
57401d5e DC	392	ret = PTR_ERR(pdev);
a79d8e93 VB	393	goto err_pdev;
a79d8e93 VB	394	}
11b0bacd	395
298cf9be LB	396	fmb->mii_bus = mdiobus_alloc();
	397	if (fmb->mii_bus == NULL) {
	398	ret = -ENOMEM;
	399	goto err_mdiobus_reg;
	400	}
11b0bacd	401
9e6c643b	402	snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
298cf9be	403	fmb->mii_bus->name = "Fixed MDIO Bus";
ec2a5652	404	fmb->mii_bus->priv = fmb;
298cf9be LB	405	fmb->mii_bus->parent = &pdev->dev;
	406	fmb->mii_bus->read = &fixed_mdio_read;
	407	fmb->mii_bus->write = &fixed_mdio_write;
298cf9be LB	408
298cf9be LB	409	ret = mdiobus_register(fmb->mii_bus);
a79d8e93	410	if (ret)
298cf9be	411	goto err_mdiobus_alloc;
11b0bacd	412
a79d8e93	413	return 0;
11b0bacd	414
298cf9be LB	415	err_mdiobus_alloc:
298cf9be LB	416	mdiobus_free(fmb->mii_bus);
a79d8e93 VB	417	err_mdiobus_reg:
	418	platform_device_unregister(pdev);
	419	err_pdev:
	420	return ret;
	421	}
	422	module_init(fixed_mdio_bus_init);
11b0bacd	423
a79d8e93 VB	424	static void __exit fixed_mdio_bus_exit(void)
	425	{
	426	struct fixed_mdio_bus *fmb = &platform_fmb;
651be3a2	427	struct fixed_phy fp, tmp;
11b0bacd	428
298cf9be LB	429	mdiobus_unregister(fmb->mii_bus);
298cf9be LB	430	mdiobus_free(fmb->mii_bus);
a79d8e93	431	platform_device_unregister(pdev);
11b0bacd	432
651be3a2	433	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
a79d8e93 VB	434	list_del(&fp->node);
a79d8e93 VB	435	kfree(fp);
7c32f470	436	}
11b0bacd	437	}
a79d8e93	438	module_exit(fixed_mdio_bus_exit);
11b0bacd	439
a79d8e93	440	MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
11b0bacd VB	441	MODULE_AUTHOR("Vitaly Bordug");
11b0bacd VB	442	MODULE_LICENSE("GPL");