[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>
#include <linux/idr.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 DEFINE_IDA(phy_fixed_ida);

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);
			ida_simple_remove(&phy_fixed_ida, phy_addr);
			return;
		}
	}
}

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 */
	phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
	if (phy_addr < 0)
		return ERR_PTR(phy_addr);

	ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
	if (ret < 0) {
		ida_simple_remove(&phy_fixed_ida, phy_addr);
		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);
	}
	ida_destroy(&phy_fixed_ida);
}
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>
69fc58a5	26	#include <linux/idr.h>
11b0bacd	27
a79d8e93	28	#define MII_REGS_NUM 29
11b0bacd	29
a79d8e93	30	struct fixed_mdio_bus {
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
a79d8e93	60	if (fp->status.duplex) {
a79d8e93 VB	61	switch (fp->status.speed) {
	62	case 1000:
	63	bmsr \|= BMSR_ESTATEN;
a79d8e93	64	break;
11b0bacd VB	65	case 100:
11b0bacd VB	66	bmsr \|= BMSR_100FULL;
7c32f470	67	break;
11b0bacd VB	68	case 10:
11b0bacd VB	69	bmsr \|= BMSR_10FULL;
7c32f470	70	break;
a79d8e93	71	default:
bc0f4a87	72	break;
11b0bacd VB	73	}
11b0bacd VB	74	} else {
a79d8e93 VB	75	switch (fp->status.speed) {
	76	case 1000:
	77	bmsr \|= BMSR_ESTATEN;
a79d8e93	78	break;
11b0bacd VB	79	case 100:
11b0bacd VB	80	bmsr \|= BMSR_100HALF;
7c32f470	81	break;
11b0bacd	82	case 10:
a79d8e93	83	bmsr \|= BMSR_10HALF;
7c32f470	84	break;
a79d8e93	85	default:
bc0f4a87	86	break;
11b0bacd VB	87	}
	88	}
	89
bc0f4a87 AL	90	if (fp->status.link) {
	91	bmsr \|= BMSR_LSTATUS \| BMSR_ANEGCOMPLETE;
	92
	93	if (fp->status.duplex) {
	94	bmcr \|= BMCR_FULLDPLX;
	95
	96	switch (fp->status.speed) {
	97	case 1000:
	98	bmcr \|= BMCR_SPEED1000;
	99	lpagb \|= LPA_1000FULL;
	100	break;
	101	case 100:
	102	bmcr \|= BMCR_SPEED100;
	103	lpa \|= LPA_100FULL;
	104	break;
	105	case 10:
	106	lpa \|= LPA_10FULL;
	107	break;
	108	default:
	109	pr_warn("fixed phy: unknown speed\n");
	110	return -EINVAL;
	111	}
	112	} else {
	113	switch (fp->status.speed) {
	114	case 1000:
	115	bmcr \|= BMCR_SPEED1000;
	116	lpagb \|= LPA_1000HALF;
	117	break;
	118	case 100:
	119	bmcr \|= BMCR_SPEED100;
	120	lpa \|= LPA_100HALF;
	121	break;
	122	case 10:
	123	lpa \|= LPA_10HALF;
	124	break;
	125	default:
	126	pr_warn("fixed phy: unknown speed\n");
	127	return -EINVAL;
	128	}
	129	}
a79d8e93	130
bc0f4a87 AL	131	if (fp->status.pause)
	132	lpa \|= LPA_PAUSE_CAP;
	133
	134	if (fp->status.asym_pause)
	135	lpa \|= LPA_PAUSE_ASYM;
	136	}
a79d8e93	137
9b744942 TP	138	fp->regs[MII_PHYSID1] = 0;
9b744942 TP	139	fp->regs[MII_PHYSID2] = 0;
a79d8e93 VB	140
	141	fp->regs[MII_BMSR] = bmsr;
	142	fp->regs[MII_BMCR] = bmcr;
	143	fp->regs[MII_LPA] = lpa;
	144	fp->regs[MII_STAT1000] = lpagb;
11b0bacd VB	145
	146	return 0;
	147	}
	148
9b744942	149	static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
11b0bacd	150	{
ec2a5652	151	struct fixed_mdio_bus *fmb = bus->priv;
a79d8e93 VB	152	struct fixed_phy *fp;
	153
	154	if (reg_num >= MII_REGS_NUM)
	155	return -1;
	156
a2dbba76 FF	157	/* We do not support emulating Clause 45 over Clause 22 register reads
	158	* return an error instead of bogus data.
	159	*/
	160	switch (reg_num) {
	161	case MII_MMD_CTRL:
	162	case MII_MMD_DATA:
	163	return -1;
	164	default:
	165	break;
	166	}
	167
a79d8e93	168	list_for_each_entry(fp, &fmb->phys, node) {
9b744942	169	if (fp->addr == phy_addr) {
a79d8e93 VB	170	/* Issue callback if user registered it. */
	171	if (fp->link_update) {
	172	fp->link_update(fp->phydev->attached_dev,
	173	&fp->status);
	174	fixed_phy_update_regs(fp);
11b0bacd	175	}
a79d8e93	176	return fp->regs[reg_num];
7c32f470	177	}
a79d8e93	178	}
11b0bacd	179
a79d8e93	180	return 0xFFFF;
11b0bacd VB	181	}
11b0bacd VB	182
9b744942	183	static int fixed_mdio_write(struct mii_bus *bus, int phy_addr, int reg_num,
a79d8e93	184	u16 val)
11b0bacd	185	{
11b0bacd VB	186	return 0;
	187	}
	188
a79d8e93 VB	189	/*
	190	* If something weird is required to be done with link/speed,
	191	* network driver is able to assign a function to implement this.
	192	* May be useful for PHY's that need to be software-driven.
	193	*/
	194	int fixed_phy_set_link_update(struct phy_device *phydev,
	195	int (link_update)(struct net_device ,
	196	struct fixed_phy_status *))
11b0bacd	197	{
a79d8e93 VB	198	struct fixed_mdio_bus *fmb = &platform_fmb;
a79d8e93 VB	199	struct fixed_phy *fp;
11b0bacd	200
e5a03bfd	201	if (!phydev \|\| !phydev->mdio.bus)
a79d8e93	202	return -EINVAL;
11b0bacd	203
a79d8e93	204	list_for_each_entry(fp, &fmb->phys, node) {
e5a03bfd	205	if (fp->addr == phydev->mdio.addr) {
a79d8e93 VB	206	fp->link_update = link_update;
	207	fp->phydev = phydev;
	208	return 0;
	209	}
	210	}
11b0bacd	211
a79d8e93	212	return -ENOENT;
7c32f470	213	}
a79d8e93	214	EXPORT_SYMBOL_GPL(fixed_phy_set_link_update);
7c32f470	215
a3bebdce SS	216	int fixed_phy_update_state(struct phy_device *phydev,
	217	const struct fixed_phy_status *status,
	218	const struct fixed_phy_status *changed)
	219	{
	220	struct fixed_mdio_bus *fmb = &platform_fmb;
	221	struct fixed_phy *fp;
	222
e5a03bfd	223	if (!phydev \|\| phydev->mdio.bus != fmb->mii_bus)
a3bebdce SS	224	return -EINVAL;
	225
	226	list_for_each_entry(fp, &fmb->phys, node) {
e5a03bfd	227	if (fp->addr == phydev->mdio.addr) {
a3bebdce SS	228	#define _UPD(x) if (changed->x) \
	229	fp->status.x = status->x
	230	_UPD(link);
	231	_UPD(speed);
	232	_UPD(duplex);
	233	_UPD(pause);
	234	_UPD(asym_pause);
	235	#undef _UPD
	236	fixed_phy_update_regs(fp);
	237	return 0;
	238	}
	239	}
	240
	241	return -ENOENT;
	242	}
	243	EXPORT_SYMBOL(fixed_phy_update_state);
	244
9b744942	245	int fixed_phy_add(unsigned int irq, int phy_addr,
a5597008 AL	246	struct fixed_phy_status *status,
a5597008 AL	247	int link_gpio)
11b0bacd	248	{
a79d8e93 VB	249	int ret;
	250	struct fixed_mdio_bus *fmb = &platform_fmb;
	251	struct fixed_phy *fp;
11b0bacd	252
a79d8e93 VB	253	fp = kzalloc(sizeof(*fp), GFP_KERNEL);
	254	if (!fp)
	255	return -ENOMEM;
11b0bacd	256
a79d8e93	257	memset(fp->regs, 0xFF, sizeof(fp->regs[0]) * MII_REGS_NUM);
11b0bacd	258
185be5ae RV	259	if (irq != PHY_POLL)
185be5ae RV	260	fmb->mii_bus->irq[phy_addr] = irq;
11b0bacd	261
9b744942	262	fp->addr = phy_addr;
a79d8e93	263	fp->status = *status;
a5597008 AL	264	fp->link_gpio = link_gpio;
	265
	266	if (gpio_is_valid(fp->link_gpio)) {
	267	ret = gpio_request_one(fp->link_gpio, GPIOF_DIR_IN,
	268	"fixed-link-gpio-link");
	269	if (ret)
	270	goto err_regs;
	271	}
7c32f470	272
a79d8e93 VB	273	ret = fixed_phy_update_regs(fp);
a79d8e93 VB	274	if (ret)
a5597008	275	goto err_gpio;
11b0bacd	276
a79d8e93	277	list_add_tail(&fp->node, &fmb->phys);
7c32f470	278
a79d8e93	279	return 0;
11b0bacd	280
a5597008 AL	281	err_gpio:
	282	if (gpio_is_valid(fp->link_gpio))
	283	gpio_free(fp->link_gpio);
a79d8e93 VB	284	err_regs:
	285	kfree(fp);
	286	return ret;
	287	}
	288	EXPORT_SYMBOL_GPL(fixed_phy_add);
11b0bacd	289
69fc58a5 FF	290	static DEFINE_IDA(phy_fixed_ida);
69fc58a5 FF	291
5bcbe0f3	292	static void fixed_phy_del(int phy_addr)
a7595121 TP	293	{
	294	struct fixed_mdio_bus *fmb = &platform_fmb;
	295	struct fixed_phy fp, tmp;
	296
	297	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
	298	if (fp->addr == phy_addr) {
	299	list_del(&fp->node);
a5597008 AL	300	if (gpio_is_valid(fp->link_gpio))
a5597008 AL	301	gpio_free(fp->link_gpio);
a7595121	302	kfree(fp);
69fc58a5	303	ida_simple_remove(&phy_fixed_ida, phy_addr);
a7595121 TP	304	return;
	305	}
	306	}
	307	}
a7595121	308
fd2ef0ba PG	309	struct phy_device *fixed_phy_register(unsigned int irq,
fd2ef0ba PG	310	struct fixed_phy_status *status,
a5597008	311	int link_gpio,
fd2ef0ba	312	struct device_node *np)
a7595121 TP	313	{
	314	struct fixed_mdio_bus *fmb = &platform_fmb;
	315	struct phy_device *phy;
	316	int phy_addr;
	317	int ret;
	318
185be5ae RV	319	if (!fmb->mii_bus \|\| fmb->mii_bus->state != MDIOBUS_REGISTERED)
	320	return ERR_PTR(-EPROBE_DEFER);
	321
a7595121	322	/* Get the next available PHY address, up to PHY_MAX_ADDR */
69fc58a5 FF	323	phy_addr = ida_simple_get(&phy_fixed_ida, 0, PHY_MAX_ADDR, GFP_KERNEL);
	324	if (phy_addr < 0)
	325	return ERR_PTR(phy_addr);
a7595121	326
bd1a05ee	327	ret = fixed_phy_add(irq, phy_addr, status, link_gpio);
69fc58a5 FF	328	if (ret < 0) {
69fc58a5 FF	329	ida_simple_remove(&phy_fixed_ida, phy_addr);
fd2ef0ba	330	return ERR_PTR(ret);
69fc58a5	331	}
a7595121 TP	332
a7595121 TP	333	phy = get_phy_device(fmb->mii_bus, phy_addr, false);
4914a584	334	if (IS_ERR(phy)) {
a7595121	335	fixed_phy_del(phy_addr);
fd2ef0ba	336	return ERR_PTR(-EINVAL);
a7595121 TP	337	}
a7595121 TP	338
4b195360 MB	339	/* propagate the fixed link values to struct phy_device */
	340	phy->link = status->link;
	341	if (status->link) {
	342	phy->speed = status->speed;
	343	phy->duplex = status->duplex;
	344	phy->pause = status->pause;
	345	phy->asym_pause = status->asym_pause;
	346	}
	347
a7595121	348	of_node_get(np);
e5a03bfd	349	phy->mdio.dev.of_node = np;
5a11dd7d	350	phy->is_pseudo_fixed_link = true;
a7595121	351
34b31da4 AL	352	switch (status->speed) {
	353	case SPEED_1000:
	354	phy->supported = PHY_1000BT_FEATURES;
	355	break;
	356	case SPEED_100:
	357	phy->supported = PHY_100BT_FEATURES;
	358	break;
	359	case SPEED_10:
	360	default:
	361	phy->supported = PHY_10BT_FEATURES;
	362	}
	363
a7595121 TP	364	ret = phy_device_register(phy);
	365	if (ret) {
	366	phy_device_free(phy);
	367	of_node_put(np);
	368	fixed_phy_del(phy_addr);
fd2ef0ba	369	return ERR_PTR(ret);
a7595121 TP	370	}
a7595121 TP	371
fd2ef0ba	372	return phy;
a7595121	373	}
37e9a690	374	EXPORT_SYMBOL_GPL(fixed_phy_register);
a7595121	375
5bcbe0f3 AL	376	void fixed_phy_unregister(struct phy_device *phy)
	377	{
	378	phy_device_remove(phy);
	379
	380	fixed_phy_del(phy->mdio.addr);
	381	}
	382	EXPORT_SYMBOL_GPL(fixed_phy_unregister);
	383
a79d8e93 VB	384	static int __init fixed_mdio_bus_init(void)
	385	{
	386	struct fixed_mdio_bus *fmb = &platform_fmb;
	387	int ret;
11b0bacd	388
a79d8e93	389	pdev = platform_device_register_simple("Fixed MDIO bus", 0, NULL, 0);
57401d5e DC	390	if (IS_ERR(pdev)) {
57401d5e DC	391	ret = PTR_ERR(pdev);
a79d8e93 VB	392	goto err_pdev;
a79d8e93 VB	393	}
11b0bacd	394
298cf9be LB	395	fmb->mii_bus = mdiobus_alloc();
	396	if (fmb->mii_bus == NULL) {
	397	ret = -ENOMEM;
	398	goto err_mdiobus_reg;
	399	}
11b0bacd	400
9e6c643b	401	snprintf(fmb->mii_bus->id, MII_BUS_ID_SIZE, "fixed-0");
298cf9be	402	fmb->mii_bus->name = "Fixed MDIO Bus";
ec2a5652	403	fmb->mii_bus->priv = fmb;
298cf9be LB	404	fmb->mii_bus->parent = &pdev->dev;
	405	fmb->mii_bus->read = &fixed_mdio_read;
	406	fmb->mii_bus->write = &fixed_mdio_write;
298cf9be LB	407
298cf9be LB	408	ret = mdiobus_register(fmb->mii_bus);
a79d8e93	409	if (ret)
298cf9be	410	goto err_mdiobus_alloc;
11b0bacd	411
a79d8e93	412	return 0;
11b0bacd	413
298cf9be LB	414	err_mdiobus_alloc:
298cf9be LB	415	mdiobus_free(fmb->mii_bus);
a79d8e93 VB	416	err_mdiobus_reg:
	417	platform_device_unregister(pdev);
	418	err_pdev:
	419	return ret;
	420	}
	421	module_init(fixed_mdio_bus_init);
11b0bacd	422
a79d8e93 VB	423	static void __exit fixed_mdio_bus_exit(void)
	424	{
	425	struct fixed_mdio_bus *fmb = &platform_fmb;
651be3a2	426	struct fixed_phy fp, tmp;
11b0bacd	427
298cf9be LB	428	mdiobus_unregister(fmb->mii_bus);
298cf9be LB	429	mdiobus_free(fmb->mii_bus);
a79d8e93	430	platform_device_unregister(pdev);
11b0bacd	431
651be3a2	432	list_for_each_entry_safe(fp, tmp, &fmb->phys, node) {
a79d8e93 VB	433	list_del(&fp->node);
a79d8e93 VB	434	kfree(fp);
7c32f470	435	}
69fc58a5	436	ida_destroy(&phy_fixed_ida);
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");