[net-next-2.6.git] / drivers / net / fec_mpc52xx_phy.c

/*
 * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
 *
 * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
 * Copyright (C) 2008  Wolfram Sang, Pengutronix
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/of_platform.h>
#include <linux/of_mdio.h>
#include <asm/io.h>
#include <asm/mpc52xx.h>
#include "fec_mpc52xx.h"

struct mpc52xx_fec_mdio_priv {
	struct mpc52xx_fec __iomem *regs;
	int mdio_irqs[PHY_MAX_ADDR];
};

static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
		int reg, u32 value)
{
	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
	struct mpc52xx_fec __iomem *fec;
	int tries = 3;

	value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
	value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;

	fec = priv->regs;
	out_be32(&fec->ievent, FEC_IEVENT_MII);
	out_be32(&priv->regs->mii_data, value);

	/* wait for it to finish, this takes about 23 us on lite5200b */
	while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
		msleep(1);

	if (!tries)
		return -ETIMEDOUT;

	return value & FEC_MII_DATA_OP_RD ?
		in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
}

static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
{
	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
}

static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
		u16 data)
{
	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
		data | FEC_MII_WRITE_FRAME);
}

static int mpc52xx_fec_mdio_probe(struct of_device *of,
		const struct of_device_id *match)
{
	struct device *dev = &of->dev;
	struct device_node *np = of->node;
	struct mii_bus *bus;
	struct mpc52xx_fec_mdio_priv *priv;
	struct resource res = {};
	int err;
	int i;

	bus = mdiobus_alloc();
	if (bus == NULL)
		return -ENOMEM;
	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (priv == NULL) {
		err = -ENOMEM;
		goto out_free;
	}

	bus->name = "mpc52xx MII bus";
	bus->read = mpc52xx_fec_mdio_read;
	bus->write = mpc52xx_fec_mdio_write;

	/* setup irqs */
	bus->irq = priv->mdio_irqs;

	/* setup registers */
	err = of_address_to_resource(np, 0, &res);
	if (err)
		goto out_free;
	priv->regs = ioremap(res.start, res.end - res.start + 1);
	if (priv->regs == NULL) {
		err = -ENOMEM;
		goto out_free;
	}

	snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
	bus->priv = priv;

	bus->parent = dev;
	dev_set_drvdata(dev, bus);

	/* set MII speed */
	out_be32(&priv->regs->mii_speed,
		((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1);

	err = of_mdiobus_register(bus, np);
	if (err)
		goto out_unmap;

	return 0;

 out_unmap:
	iounmap(priv->regs);
 out_free:
	for (i=0; i<PHY_MAX_ADDR; i++)
		if (bus->irq[i] != PHY_POLL)
			irq_dispose_mapping(bus->irq[i]);
	kfree(bus->irq);
	kfree(priv);
	mdiobus_free(bus);

	return err;
}

static int mpc52xx_fec_mdio_remove(struct of_device *of)
{
	struct device *dev = &of->dev;
	struct mii_bus *bus = dev_get_drvdata(dev);
	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
	int i;

	mdiobus_unregister(bus);
	dev_set_drvdata(dev, NULL);

	iounmap(priv->regs);
	for (i=0; i<PHY_MAX_ADDR; i++)
		if (bus->irq[i] != PHY_POLL)
			irq_dispose_mapping(bus->irq[i]);
	kfree(priv);
	kfree(bus->irq);
	mdiobus_free(bus);

	return 0;
}


static struct of_device_id mpc52xx_fec_mdio_match[] = {
	{ .compatible = "fsl,mpc5200b-mdio", },
	{ .compatible = "fsl,mpc5200-mdio", },
	{ .compatible = "mpc5200b-fec-phy", },
	{}
};

struct of_platform_driver mpc52xx_fec_mdio_driver = {
	.name = "mpc5200b-fec-phy",
	.probe = mpc52xx_fec_mdio_probe,
	.remove = mpc52xx_fec_mdio_remove,
	.match_table = mpc52xx_fec_mdio_match,
};

/* let fec driver call it, since this has to be registered before it */
EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);


MODULE_LICENSE("Dual BSD/GPL");
Commit	Line	Data
5d031e9e DP	1	/*
	2	* Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
	3	*
	4	* Copyright (C) 2007 Domen Puncer, Telargo, Inc.
51d9861e	5	* Copyright (C) 2008 Wolfram Sang, Pengutronix
5d031e9e DP	6	*
	7	* This file is licensed under the terms of the GNU General Public License
	8	* version 2. This program is licensed "as is" without any warranty of any
	9	* kind, whether express or implied.
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/netdevice.h>
	15	#include <linux/phy.h>
	16	#include <linux/of_platform.h>
ca816d98	17	#include <linux/of_mdio.h>
5d031e9e DP	18	#include <asm/io.h>
	19	#include <asm/mpc52xx.h>
	20	#include "fec_mpc52xx.h"
	21
	22	struct mpc52xx_fec_mdio_priv {
	23	struct mpc52xx_fec __iomem *regs;
ca816d98	24	int mdio_irqs[PHY_MAX_ADDR];
5d031e9e DP	25	};
5d031e9e DP	26
51d9861e WS	27	static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
51d9861e WS	28	int reg, u32 value)
5d031e9e DP	29	{
	30	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
	31	struct mpc52xx_fec __iomem *fec;
ca816d98	32	int tries = 3;
51d9861e WS	33
	34	value \|= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
	35	value \|= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
5d031e9e DP	36
	37	fec = priv->regs;
	38	out_be32(&fec->ievent, FEC_IEVENT_MII);
51d9861e	39	out_be32(&priv->regs->mii_data, value);
5d031e9e DP	40
	41	/* wait for it to finish, this takes about 23 us on lite5200b */
	42	while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
ca816d98	43	msleep(1);
5d031e9e	44
51d9861e	45	if (!tries)
5d031e9e DP	46	return -ETIMEDOUT;
5d031e9e DP	47
51d9861e WS	48	return value & FEC_MII_DATA_OP_RD ?
51d9861e WS	49	in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
5d031e9e DP	50	}
5d031e9e DP	51
51d9861e	52	static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
5d031e9e	53	{
51d9861e WS	54	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
51d9861e WS	55	}
5d031e9e	56
51d9861e WS	57	static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
	58	u16 data)
	59	{
	60	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
	61	data \| FEC_MII_WRITE_FRAME);
5d031e9e DP	62	}
5d031e9e DP	63
51d9861e WS	64	static int mpc52xx_fec_mdio_probe(struct of_device *of,
51d9861e WS	65	const struct of_device_id *match)
5d031e9e DP	66	{
	67	struct device *dev = &of->dev;
	68	struct device_node *np = of->node;
5d031e9e DP	69	struct mii_bus *bus;
	70	struct mpc52xx_fec_mdio_priv *priv;
	71	struct resource res = {};
	72	int err;
	73	int i;
	74
298cf9be	75	bus = mdiobus_alloc();
5d031e9e DP	76	if (bus == NULL)
	77	return -ENOMEM;
	78	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	79	if (priv == NULL) {
	80	err = -ENOMEM;
	81	goto out_free;
	82	}
	83
	84	bus->name = "mpc52xx MII bus";
	85	bus->read = mpc52xx_fec_mdio_read;
	86	bus->write = mpc52xx_fec_mdio_write;
	87
	88	/* setup irqs */
ca816d98	89	bus->irq = priv->mdio_irqs;
5d031e9e DP	90
	91	/* setup registers */
	92	err = of_address_to_resource(np, 0, &res);
	93	if (err)
	94	goto out_free;
	95	priv->regs = ioremap(res.start, res.end - res.start + 1);
	96	if (priv->regs == NULL) {
	97	err = -ENOMEM;
	98	goto out_free;
	99	}
	100
9d9326d3	101	snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
5d031e9e DP	102	bus->priv = priv;
5d031e9e DP	103
18ee49dd	104	bus->parent = dev;
5d031e9e DP	105	dev_set_drvdata(dev, bus);
	106
	107	/* set MII speed */
51d9861e	108	out_be32(&priv->regs->mii_speed,
87c441e5	109	((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1);
5d031e9e	110
ca816d98	111	err = of_mdiobus_register(bus, np);
5d031e9e DP	112	if (err)
	113	goto out_unmap;
	114
	115	return 0;
	116
	117	out_unmap:
	118	iounmap(priv->regs);
	119	out_free:
	120	for (i=0; i<PHY_MAX_ADDR; i++)
	121	if (bus->irq[i] != PHY_POLL)
	122	irq_dispose_mapping(bus->irq[i]);
	123	kfree(bus->irq);
	124	kfree(priv);
298cf9be	125	mdiobus_free(bus);
5d031e9e DP	126
	127	return err;
	128	}
	129
	130	static int mpc52xx_fec_mdio_remove(struct of_device *of)
	131	{
	132	struct device *dev = &of->dev;
	133	struct mii_bus *bus = dev_get_drvdata(dev);
	134	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
	135	int i;
	136
	137	mdiobus_unregister(bus);
	138	dev_set_drvdata(dev, NULL);
	139
	140	iounmap(priv->regs);
	141	for (i=0; i<PHY_MAX_ADDR; i++)
e51f47a5	142	if (bus->irq[i] != PHY_POLL)
5d031e9e DP	143	irq_dispose_mapping(bus->irq[i]);
	144	kfree(priv);
	145	kfree(bus->irq);
298cf9be	146	mdiobus_free(bus);
5d031e9e DP	147
	148	return 0;
	149	}
	150
	151
	152	static struct of_device_id mpc52xx_fec_mdio_match[] = {
66ffbe49	153	{ .compatible = "fsl,mpc5200b-mdio", },
8d813941	154	{ .compatible = "fsl,mpc5200-mdio", },
66ffbe49 GL	155	{ .compatible = "mpc5200b-fec-phy", },
66ffbe49 GL	156	{}
5d031e9e DP	157	};
	158
	159	struct of_platform_driver mpc52xx_fec_mdio_driver = {
	160	.name = "mpc5200b-fec-phy",
	161	.probe = mpc52xx_fec_mdio_probe,
	162	.remove = mpc52xx_fec_mdio_remove,
	163	.match_table = mpc52xx_fec_mdio_match,
	164	};
	165
	166	/* let fec driver call it, since this has to be registered before it */
	167	EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
	168
	169
	170	MODULE_LICENSE("Dual BSD/GPL");