[linux-2.6-block.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/slab.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", },
	{}
};
MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);

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>
5a0e3ad6	17	#include <linux/slab.h>
ca816d98	18	#include <linux/of_mdio.h>
5d031e9e DP	19	#include <asm/io.h>
	20	#include <asm/mpc52xx.h>
	21	#include "fec_mpc52xx.h"
	22
	23	struct mpc52xx_fec_mdio_priv {
	24	struct mpc52xx_fec __iomem *regs;
ca816d98	25	int mdio_irqs[PHY_MAX_ADDR];
5d031e9e DP	26	};
5d031e9e DP	27
51d9861e WS	28	static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
51d9861e WS	29	int reg, u32 value)
5d031e9e DP	30	{
	31	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
	32	struct mpc52xx_fec __iomem *fec;
ca816d98	33	int tries = 3;
51d9861e WS	34
	35	value \|= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
	36	value \|= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
5d031e9e DP	37
	38	fec = priv->regs;
	39	out_be32(&fec->ievent, FEC_IEVENT_MII);
51d9861e	40	out_be32(&priv->regs->mii_data, value);
5d031e9e DP	41
	42	/* wait for it to finish, this takes about 23 us on lite5200b */
	43	while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
ca816d98	44	msleep(1);
5d031e9e	45
51d9861e	46	if (!tries)
5d031e9e DP	47	return -ETIMEDOUT;
5d031e9e DP	48
51d9861e WS	49	return value & FEC_MII_DATA_OP_RD ?
51d9861e WS	50	in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
5d031e9e DP	51	}
5d031e9e DP	52
51d9861e	53	static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
5d031e9e	54	{
51d9861e WS	55	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
51d9861e WS	56	}
5d031e9e	57
51d9861e WS	58	static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
	59	u16 data)
	60	{
	61	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
	62	data \| FEC_MII_WRITE_FRAME);
5d031e9e DP	63	}
5d031e9e DP	64
51d9861e WS	65	static int mpc52xx_fec_mdio_probe(struct of_device *of,
51d9861e WS	66	const struct of_device_id *match)
5d031e9e DP	67	{
	68	struct device *dev = &of->dev;
	69	struct device_node *np = of->node;
5d031e9e DP	70	struct mii_bus *bus;
	71	struct mpc52xx_fec_mdio_priv *priv;
	72	struct resource res = {};
	73	int err;
	74	int i;
	75
298cf9be	76	bus = mdiobus_alloc();
5d031e9e DP	77	if (bus == NULL)
	78	return -ENOMEM;
	79	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	80	if (priv == NULL) {
	81	err = -ENOMEM;
	82	goto out_free;
	83	}
	84
	85	bus->name = "mpc52xx MII bus";
	86	bus->read = mpc52xx_fec_mdio_read;
	87	bus->write = mpc52xx_fec_mdio_write;
	88
	89	/* setup irqs */
ca816d98	90	bus->irq = priv->mdio_irqs;
5d031e9e DP	91
	92	/* setup registers */
	93	err = of_address_to_resource(np, 0, &res);
	94	if (err)
	95	goto out_free;
	96	priv->regs = ioremap(res.start, res.end - res.start + 1);
	97	if (priv->regs == NULL) {
	98	err = -ENOMEM;
	99	goto out_free;
	100	}
	101
9d9326d3	102	snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
5d031e9e DP	103	bus->priv = priv;
5d031e9e DP	104
18ee49dd	105	bus->parent = dev;
5d031e9e DP	106	dev_set_drvdata(dev, bus);
	107
	108	/* set MII speed */
51d9861e	109	out_be32(&priv->regs->mii_speed,
87c441e5	110	((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1);
5d031e9e	111
ca816d98	112	err = of_mdiobus_register(bus, np);
5d031e9e DP	113	if (err)
	114	goto out_unmap;
	115
	116	return 0;
	117
	118	out_unmap:
	119	iounmap(priv->regs);
	120	out_free:
	121	for (i=0; i<PHY_MAX_ADDR; i++)
	122	if (bus->irq[i] != PHY_POLL)
	123	irq_dispose_mapping(bus->irq[i]);
	124	kfree(bus->irq);
	125	kfree(priv);
298cf9be	126	mdiobus_free(bus);
5d031e9e DP	127
	128	return err;
	129	}
	130
	131	static int mpc52xx_fec_mdio_remove(struct of_device *of)
	132	{
	133	struct device *dev = &of->dev;
	134	struct mii_bus *bus = dev_get_drvdata(dev);
	135	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
	136	int i;
	137
	138	mdiobus_unregister(bus);
	139	dev_set_drvdata(dev, NULL);
	140
	141	iounmap(priv->regs);
	142	for (i=0; i<PHY_MAX_ADDR; i++)
e51f47a5	143	if (bus->irq[i] != PHY_POLL)
5d031e9e DP	144	irq_dispose_mapping(bus->irq[i]);
	145	kfree(priv);
	146	kfree(bus->irq);
298cf9be	147	mdiobus_free(bus);
5d031e9e DP	148
	149	return 0;
	150	}
	151
	152
	153	static struct of_device_id mpc52xx_fec_mdio_match[] = {
66ffbe49	154	{ .compatible = "fsl,mpc5200b-mdio", },
8d813941	155	{ .compatible = "fsl,mpc5200-mdio", },
66ffbe49 GL	156	{ .compatible = "mpc5200b-fec-phy", },
66ffbe49 GL	157	{}
5d031e9e	158	};
e72701ac	159	MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
5d031e9e DP	160
	161	struct of_platform_driver mpc52xx_fec_mdio_driver = {
	162	.name = "mpc5200b-fec-phy",
	163	.probe = mpc52xx_fec_mdio_probe,
	164	.remove = mpc52xx_fec_mdio_remove,
	165	.match_table = mpc52xx_fec_mdio_match,
	166	};
	167
	168	/* let fec driver call it, since this has to be registered before it */
	169	EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
	170
	171
	172	MODULE_LICENSE("Dual BSD/GPL");