[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 {
	int irqs[PHY_MAX_ADDR];
	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.link)
		goto done;
	bmsr |= BMSR_LSTATUS | BMSR_ANEGCOMPLETE;

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

		switch (fp->status.speed) {
		case 1000:
			bmsr |= BMSR_ESTATEN;
			bmcr |= BMCR_SPEED1000;
			lpagb |= LPA_1000FULL;
			break;
		case 100:
			bmsr |= BMSR_100FULL;
			bmcr |= BMCR_SPEED100;
			lpa |= LPA_100FULL;
			break;
		case 10:
			bmsr |= BMSR_10FULL;
			lpa |= LPA_10FULL;
			break;
		default:
			pr_warn("fixed phy: unknown speed\n");
			return -EINVAL;
		}
	} else {
		switch (fp->status.speed) {
		case 1000:
			bmsr |= BMSR_ESTATEN;
			bmcr |= BMCR_SPEED1000;
			lpagb |= LPA_1000HALF;
			break;
		case 100:
			bmsr |= BMSR_100HALF;
			bmcr |= BMCR_SPEED100;
			lpa |= LPA_100HALF;
			break;
		case 10:
			bmsr |= BMSR_10HALF;
			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;

done:
	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->bus)
		return -EINVAL;

	list_for_each_entry(fp, &fmb->phys, node) {
		if (fp->addr == phydev->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->bus)
		return -EINVAL;

	list_for_each_entry(fp, &fmb->phys, node) {
		if (fp->addr == phydev->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);

	fmb->irqs[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);

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;
		}
	}
}
EXPORT_SYMBOL_GPL(fixed_phy_del);

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;

	/* 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(PHY_POLL, phy_addr, status, link_gpio);
	if (ret < 0)
		return ERR_PTR(ret);

	phy = get_phy_device(fmb->mii_bus, phy_addr, false);
	if (!phy || 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->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);

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;
	fmb->mii_bus->irq = fmb->irqs;

	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 VB	29	struct fixed_mdio_bus {
a79d8e93 VB	30	int irqs[PHY_MAX_ADDR];
298cf9be	31	struct mii_bus *mii_bus;
a79d8e93 VB	32	struct list_head phys;
a79d8e93 VB	33	};
11b0bacd	34
a79d8e93	35	struct fixed_phy {
9b744942	36	int addr;
a79d8e93 VB	37	u16 regs[MII_REGS_NUM];
	38	struct phy_device *phydev;
	39	struct fixed_phy_status status;
	40	int (link_update)(struct net_device , struct fixed_phy_status *);
	41	struct list_head node;
a5597008	42	int link_gpio;
a79d8e93	43	};
7c32f470	44
a79d8e93 VB	45	static struct platform_device *pdev;
	46	static struct fixed_mdio_bus platform_fmb = {
	47	.phys = LIST_HEAD_INIT(platform_fmb.phys),
	48	};
7c32f470	49
a79d8e93	50	static int fixed_phy_update_regs(struct fixed_phy *fp)
11b0bacd	51	{
a79d8e93	52	u16 bmsr = BMSR_ANEGCAPABLE;
11b0bacd	53	u16 bmcr = 0;
a79d8e93 VB	54	u16 lpagb = 0;
a79d8e93 VB	55	u16 lpa = 0;
11b0bacd	56
a5597008 AL	57	if (gpio_is_valid(fp->link_gpio))
	58	fp->status.link = !!gpio_get_value_cansleep(fp->link_gpio);
	59
868a4215 SS	60	if (!fp->status.link)
	61	goto done;
	62	bmsr \|= BMSR_LSTATUS \| BMSR_ANEGCOMPLETE;
	63
a79d8e93	64	if (fp->status.duplex) {
11b0bacd VB	65	bmcr \|= BMCR_FULLDPLX;
11b0bacd VB	66
a79d8e93 VB	67	switch (fp->status.speed) {
	68	case 1000:
	69	bmsr \|= BMSR_ESTATEN;
	70	bmcr \|= BMCR_SPEED1000;
	71	lpagb \|= LPA_1000FULL;
	72	break;
11b0bacd VB	73	case 100:
	74	bmsr \|= BMSR_100FULL;
	75	bmcr \|= BMCR_SPEED100;
a79d8e93	76	lpa \|= LPA_100FULL;
7c32f470	77	break;
11b0bacd VB	78	case 10:
11b0bacd VB	79	bmsr \|= BMSR_10FULL;
a79d8e93	80	lpa \|= LPA_10FULL;
7c32f470	81	break;
a79d8e93	82	default:
8d242488	83	pr_warn("fixed phy: unknown speed\n");
a79d8e93	84	return -EINVAL;
11b0bacd VB	85	}
11b0bacd VB	86	} else {
a79d8e93 VB	87	switch (fp->status.speed) {
	88	case 1000:
	89	bmsr \|= BMSR_ESTATEN;
	90	bmcr \|= BMCR_SPEED1000;
	91	lpagb \|= LPA_1000HALF;
	92	break;
11b0bacd VB	93	case 100:
	94	bmsr \|= BMSR_100HALF;
	95	bmcr \|= BMCR_SPEED100;
a79d8e93	96	lpa \|= LPA_100HALF;
7c32f470	97	break;
11b0bacd	98	case 10:
a79d8e93 VB	99	bmsr \|= BMSR_10HALF;
a79d8e93 VB	100	lpa \|= LPA_10HALF;
7c32f470	101	break;
a79d8e93	102	default:
8d242488	103	pr_warn("fixed phy: unknown speed\n");
a79d8e93	104	return -EINVAL;
11b0bacd VB	105	}
	106	}
	107
a79d8e93 VB	108	if (fp->status.pause)
	109	lpa \|= LPA_PAUSE_CAP;
	110
	111	if (fp->status.asym_pause)
	112	lpa \|= LPA_PAUSE_ASYM;
	113
868a4215	114	done:
9b744942 TP	115	fp->regs[MII_PHYSID1] = 0;
9b744942 TP	116	fp->regs[MII_PHYSID2] = 0;
a79d8e93 VB	117
	118	fp->regs[MII_BMSR] = bmsr;
	119	fp->regs[MII_BMCR] = bmcr;
	120	fp->regs[MII_LPA] = lpa;
	121	fp->regs[MII_STAT1000] = lpagb;
11b0bacd VB	122
	123	return 0;
	124	}
	125
9b744942	126	static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
11b0bacd	127	{
ec2a5652	128	struct fixed_mdio_bus *fmb = bus->priv;
a79d8e93 VB	129	struct fixed_phy *fp;
	130
	131	if (reg_num >= MII_REGS_NUM)
	132	return -1;
	133
a2dbba76 FF	134	/* We do not support emulating Clause 45 over Clause 22 register reads
	135	* return an error instead of bogus data.
	136	*/
	137	switch (reg_num) {
	138	case MII_MMD_CTRL:
	139	case MII_MMD_DATA:
	140	return -1;
	141	default:
	142	break;
	143	}
	144
a79d8e93	145	list_for_each_entry(fp, &fmb->phys, node) {
9b744942	146	if (fp->addr == phy_addr) {
a79d8e93 VB	147	/* Issue callback if user registered it. */
	148	if (fp->link_update) {
	149	fp->link_update(fp->phydev->attached_dev,
	150	&fp->status);
	151	fixed_phy_update_regs(fp);
11b0bacd	152	}
a79d8e93	153	return fp->regs[reg_num];
7c32f470	154	}
a79d8e93	155	}
11b0bacd	156
a79d8e93	157	return 0xFFFF;
11b0bacd VB	158	}
11b0bacd VB	159
9b744942	160	static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
a79d8e93	161	u16 val)
11b0bacd	162	{
11b0bacd VB	163	return 0;
	164	}
	165
a79d8e93 VB	166	/*
	167	* If something weird is required to be done with link/speed,
	168	* network driver is able to assign a function to implement this.
	169	* May be useful for PHY's that need to be software-driven.
	170	*/
	171	int fixed_phy_set_link_update(struct phy_device *phydev,
	172	int (link_update)(struct net_device ,
	173	struct fixed_phy_status *))
11b0bacd	174	{
a79d8e93 VB	175	struct fixed_mdio_bus *fmb = &platform_fmb;
a79d8e93 VB	176	struct fixed_phy *fp;
11b0bacd	177
799d4444	178	if (!phydev \|\| !phydev->bus)
a79d8e93	179	return -EINVAL;
11b0bacd	180
a79d8e93	181	list_for_each_entry(fp, &fmb->phys, node) {
9b744942	182	if (fp->addr == phydev->addr) {
a79d8e93 VB	183	fp->link_update = link_update;
	184	fp->phydev = phydev;
	185	return 0;
	186	}
	187	}
11b0bacd	188
a79d8e93	189	return -ENOENT;
7c32f470	190	}
a79d8e93	191	EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
7c32f470	192
a3bebdce SS	193	int fixed_phy_update_state(struct phy_device *phydev,
	194	const struct fixed_phy_status *status,
	195	const struct fixed_phy_status *changed)
	196	{
	197	struct fixed_mdio_bus *fmb = &platform_fmb;
	198	struct fixed_phy *fp;
	199
	200	if (!phydev \|\| !phydev->bus)
	201	return -EINVAL;
	202
	203	list_for_each_entry(fp, &fmb->phys, node) {
	204	if (fp->addr == phydev->addr) {
	205	#define _UPD(x) if (changed->x) \
	206	fp->status.x = status->x
	207	_UPD(link);
	208	_UPD(speed);
	209	_UPD(duplex);
	210	_UPD(pause);
	211	_UPD(asym_pause);
	212	#undef _UPD
	213	fixed_phy_update_regs(fp);
	214	return 0;
	215	}
	216	}
	217
	218	return -ENOENT;
	219	}
	220	EXPORT_SYMBOL(fixed_phy_update_state);
	221
9b744942	222	int fixed_phy_add(unsigned int irq, int phy_addr,
a5597008 AL	223	struct fixed_phy_status *status,
a5597008 AL	224	int link_gpio)
11b0bacd	225	{
a79d8e93 VB	226	int ret;
	227	struct fixed_mdio_bus *fmb = &platform_fmb;
	228	struct fixed_phy *fp;
11b0bacd	229
a79d8e93 VB	230	fp = kzalloc(sizeof(*fp), GFP_KERNEL);
	231	if (!fp)
	232	return -ENOMEM;
11b0bacd	233
a79d8e93	234	memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
11b0bacd	235
9b744942	236	fmb->irqs[phy_addr] = irq;
11b0bacd	237
9b744942	238	fp->addr = phy_addr;
a79d8e93	239	fp->status = *status;
a5597008 AL	240	fp->link_gpio = link_gpio;
	241
	242	if (gpio_is_valid(fp->link_gpio)) {
	243	ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
	244	"fixed-link-gpio-link");
	245	if (ret)
	246	goto err_regs;
	247	}
7c32f470	248
a79d8e93 VB	249	ret = fixed_phy_update_regs(fp);
a79d8e93 VB	250	if (ret)
a5597008	251	goto err_gpio;
11b0bacd	252
a79d8e93	253	list_add_tail(&fp->node, &fmb->phys);
7c32f470	254
a79d8e93	255	return 0;
11b0bacd	256
a5597008 AL	257	err_gpio:
	258	if (gpio_is_valid(fp->link_gpio))
	259	gpio_free(fp->link_gpio);
a79d8e93 VB	260	err_regs:
	261	kfree(fp);
	262	return ret;
	263	}
	264	EXPORT_SYMBOL_GPL(fixed_phy_add);
11b0bacd	265
a7595121 TP	266	void fixed_phy_del(int phy_addr)
	267	{
	268	struct fixed_mdio_bus *fmb = &platform_fmb;
	269	struct fixed_phy fp, tmp;
	270
	271	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
	272	if (fp->addr == phy_addr) {
	273	list_del(&fp->node);
a5597008 AL	274	if (gpio_is_valid(fp->link_gpio))
a5597008 AL	275	gpio_free(fp->link_gpio);
a7595121 TP	276	kfree(fp);
	277	return;
	278	}
	279	}
	280	}
	281	EXPORT_SYMBOL_GPL(fixed_phy_del);
	282
	283	static int phy_fixed_addr;
	284	static DEFINE_SPINLOCK(phy_fixed_addr_lock);
	285
fd2ef0ba PG	286	struct phy_device *fixed_phy_register(unsigned int irq,
fd2ef0ba PG	287	struct fixed_phy_status *status,
a5597008	288	int link_gpio,
fd2ef0ba	289	struct device_node *np)
a7595121 TP	290	{
	291	struct fixed_mdio_bus *fmb = &platform_fmb;
	292	struct phy_device *phy;
	293	int phy_addr;
	294	int ret;
	295
	296	/* Get the next available PHY address, up to PHY_MAX_ADDR */
	297	spin_lock(&phy_fixed_addr_lock);
	298	if (phy_fixed_addr == PHY_MAX_ADDR) {
	299	spin_unlock(&phy_fixed_addr_lock);
fd2ef0ba	300	return ERR_PTR(-ENOSPC);
a7595121 TP	301	}
	302	phy_addr = phy_fixed_addr++;
	303	spin_unlock(&phy_fixed_addr_lock);
	304
a5597008	305	ret = fixed_phy_add(PHY_POLL, phy_addr, status, link_gpio);
a7595121	306	if (ret < 0)
fd2ef0ba	307	return ERR_PTR(ret);
a7595121 TP	308
	309	phy = get_phy_device(fmb->mii_bus, phy_addr, false);
	310	if (!phy \|\| IS_ERR(phy)) {
	311	fixed_phy_del(phy_addr);
fd2ef0ba	312	return ERR_PTR(-EINVAL);
a7595121 TP	313	}
a7595121 TP	314
4b195360 MB	315	/* propagate the fixed link values to struct phy_device */
	316	phy->link = status->link;
	317	if (status->link) {
	318	phy->speed = status->speed;
	319	phy->duplex = status->duplex;
	320	phy->pause = status->pause;
	321	phy->asym_pause = status->asym_pause;
	322	}
	323
a7595121 TP	324	of_node_get(np);
a7595121 TP	325	phy->dev.of_node = np;
5a11dd7d	326	phy->is_pseudo_fixed_link = true;
a7595121	327
34b31da4 AL	328	switch (status->speed) {
	329	case SPEED_1000:
	330	phy->supported = PHY_1000BT_FEATURES;
	331	break;
	332	case SPEED_100:
	333	phy->supported = PHY_100BT_FEATURES;
	334	break;
	335	case SPEED_10:
	336	default:
	337	phy->supported = PHY_10BT_FEATURES;
	338	}
	339
a7595121 TP	340	ret = phy_device_register(phy);
	341	if (ret) {
	342	phy_device_free(phy);
	343	of_node_put(np);
	344	fixed_phy_del(phy_addr);
fd2ef0ba	345	return ERR_PTR(ret);
a7595121 TP	346	}
a7595121 TP	347
fd2ef0ba	348	return phy;
a7595121	349	}
37e9a690	350	EXPORT_SYMBOL_GPL(fixed_phy_register);
a7595121	351
a79d8e93 VB	352	static int __init fixed_mdio_bus_init(void)
	353	{
	354	struct fixed_mdio_bus *fmb = &platform_fmb;
	355	int ret;
11b0bacd	356
a79d8e93	357	pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
57401d5e DC	358	if (IS_ERR(pdev)) {
57401d5e DC	359	ret = PTR_ERR(pdev);
a79d8e93 VB	360	goto err_pdev;
a79d8e93 VB	361	}
11b0bacd	362
298cf9be LB	363	fmb->mii_bus = mdiobus_alloc();
	364	if (fmb->mii_bus == NULL) {
	365	ret = -ENOMEM;
	366	goto err_mdiobus_reg;
	367	}
11b0bacd	368
9e6c643b	369	snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
298cf9be	370	fmb->mii_bus->name = "Fixed MDIO Bus";
ec2a5652	371	fmb->mii_bus->priv = fmb;
298cf9be LB	372	fmb->mii_bus->parent = &pdev->dev;
	373	fmb->mii_bus->read = &fixed_mdio_read;
	374	fmb->mii_bus->write = &fixed_mdio_write;
	375	fmb->mii_bus->irq = fmb->irqs;
	376
	377	ret = mdiobus_register(fmb->mii_bus);
a79d8e93	378	if (ret)
298cf9be	379	goto err_mdiobus_alloc;
11b0bacd	380
a79d8e93	381	return 0;
11b0bacd	382
298cf9be LB	383	err_mdiobus_alloc:
298cf9be LB	384	mdiobus_free(fmb->mii_bus);
a79d8e93 VB	385	err_mdiobus_reg:
	386	platform_device_unregister(pdev);
	387	err_pdev:
	388	return ret;
	389	}
	390	module_init(fixed_mdio_bus_init);
11b0bacd	391
a79d8e93 VB	392	static void __exit fixed_mdio_bus_exit(void)
	393	{
	394	struct fixed_mdio_bus *fmb = &platform_fmb;
651be3a2	395	struct fixed_phy fp, tmp;
11b0bacd	396
298cf9be LB	397	mdiobus_unregister(fmb->mii_bus);
298cf9be LB	398	mdiobus_free(fmb->mii_bus);
a79d8e93	399	platform_device_unregister(pdev);
11b0bacd	400
651be3a2	401	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
a79d8e93 VB	402	list_del(&fp->node);
a79d8e93 VB	403	kfree(fp);
7c32f470	404	}
11b0bacd	405	}
a79d8e93	406	module_exit(fixed_mdio_bus_exit);
11b0bacd	407
a79d8e93	408	MODULE_DESCRIPTION("Fixed MDIO bus (MDIO bus emulation with fixed PHYs)");
11b0bacd VB	409	MODULE_AUTHOR("Vitaly Bordug");
11b0bacd VB	410	MODULE_LICENSE("GPL");