[GitHub/mt8127/android_kernel_alcatel_ttab.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 <asm/io.h>
#include <asm/mpc52xx.h>
#include "fec_mpc52xx.h"

struct mpc52xx_fec_mdio_priv {
	struct mpc52xx_fec __iomem *regs;
};

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 = 100;

	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)
		udelay(5);

	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 device_node *child = NULL;
	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 = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
	if (bus->irq == NULL) {
		err = -ENOMEM;
		goto out_free;
	}
	for (i=0; i<PHY_MAX_ADDR; i++)
		bus->irq[i] = PHY_POLL;

	while ((child = of_get_next_child(np, child)) != NULL) {
		int irq = irq_of_parse_and_map(child, 0);
		if (irq != NO_IRQ) {
			const u32 *id = of_get_property(child, "reg", NULL);
			if (id)
				bus->irq[*id] = irq;
		}
	}

	/* 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,
		((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);

	/* enable MII interrupt */
	out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) | FEC_IMASK_MII);

	err = mdiobus_register(bus);
	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])
			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>
	17	#include <asm/io.h>
	18	#include <asm/mpc52xx.h>
	19	#include "fec_mpc52xx.h"
	20
	21	struct mpc52xx_fec_mdio_priv {
	22	struct mpc52xx_fec __iomem *regs;
	23	};
	24
51d9861e WS	25	static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
51d9861e WS	26	int reg, u32 value)
5d031e9e DP	27	{
	28	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
	29	struct mpc52xx_fec __iomem *fec;
	30	int tries = 100;
51d9861e WS	31
	32	value \|= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
	33	value \|= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
5d031e9e DP	34
	35	fec = priv->regs;
	36	out_be32(&fec->ievent, FEC_IEVENT_MII);
51d9861e	37	out_be32(&priv->regs->mii_data, value);
5d031e9e DP	38
	39	/* wait for it to finish, this takes about 23 us on lite5200b */
	40	while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
	41	udelay(5);
	42
51d9861e	43	if (!tries)
5d031e9e DP	44	return -ETIMEDOUT;
5d031e9e DP	45
51d9861e WS	46	return value & FEC_MII_DATA_OP_RD ?
51d9861e WS	47	in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
5d031e9e DP	48	}
5d031e9e DP	49
51d9861e	50	static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
5d031e9e	51	{
51d9861e WS	52	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
51d9861e WS	53	}
5d031e9e	54
51d9861e WS	55	static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
	56	u16 data)
	57	{
	58	return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
	59	data \| FEC_MII_WRITE_FRAME);
5d031e9e DP	60	}
5d031e9e DP	61
51d9861e WS	62	static int mpc52xx_fec_mdio_probe(struct of_device *of,
51d9861e WS	63	const struct of_device_id *match)
5d031e9e DP	64	{
	65	struct device *dev = &of->dev;
	66	struct device_node *np = of->node;
	67	struct device_node *child = NULL;
	68	struct mii_bus *bus;
	69	struct mpc52xx_fec_mdio_priv *priv;
	70	struct resource res = {};
	71	int err;
	72	int i;
	73
298cf9be	74	bus = mdiobus_alloc();
5d031e9e DP	75	if (bus == NULL)
	76	return -ENOMEM;
	77	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	78	if (priv == NULL) {
	79	err = -ENOMEM;
	80	goto out_free;
	81	}
	82
	83	bus->name = "mpc52xx MII bus";
	84	bus->read = mpc52xx_fec_mdio_read;
	85	bus->write = mpc52xx_fec_mdio_write;
	86
	87	/* setup irqs */
	88	bus->irq = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
	89	if (bus->irq == NULL) {
	90	err = -ENOMEM;
	91	goto out_free;
	92	}
	93	for (i=0; i<PHY_MAX_ADDR; i++)
	94	bus->irq[i] = PHY_POLL;
	95
	96	while ((child = of_get_next_child(np, child)) != NULL) {
	97	int irq = irq_of_parse_and_map(child, 0);
	98	if (irq != NO_IRQ) {
	99	const u32 *id = of_get_property(child, "reg", NULL);
b8c19eb1 GL	100	if (id)
b8c19eb1 GL	101	bus->irq[*id] = irq;
5d031e9e DP	102	}
	103	}
	104
	105	/* setup registers */
	106	err = of_address_to_resource(np, 0, &res);
	107	if (err)
	108	goto out_free;
	109	priv->regs = ioremap(res.start, res.end - res.start + 1);
	110	if (priv->regs == NULL) {
	111	err = -ENOMEM;
	112	goto out_free;
	113	}
	114
9d9326d3	115	snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
5d031e9e DP	116	bus->priv = priv;
5d031e9e DP	117
18ee49dd	118	bus->parent = dev;
5d031e9e DP	119	dev_set_drvdata(dev, bus);
	120
	121	/* set MII speed */
51d9861e WS	122	out_be32(&priv->regs->mii_speed,
51d9861e WS	123	((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
5d031e9e DP	124
	125	/* enable MII interrupt */
	126	out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) \| FEC_IMASK_MII);
	127
	128	err = mdiobus_register(bus);
	129	if (err)
	130	goto out_unmap;
	131
	132	return 0;
	133
	134	out_unmap:
	135	iounmap(priv->regs);
	136	out_free:
	137	for (i=0; i<PHY_MAX_ADDR; i++)
	138	if (bus->irq[i] != PHY_POLL)
	139	irq_dispose_mapping(bus->irq[i]);
	140	kfree(bus->irq);
	141	kfree(priv);
298cf9be	142	mdiobus_free(bus);
5d031e9e DP	143
	144	return err;
	145	}
	146
	147	static int mpc52xx_fec_mdio_remove(struct of_device *of)
	148	{
	149	struct device *dev = &of->dev;
	150	struct mii_bus *bus = dev_get_drvdata(dev);
	151	struct mpc52xx_fec_mdio_priv *priv = bus->priv;
	152	int i;
	153
	154	mdiobus_unregister(bus);
	155	dev_set_drvdata(dev, NULL);
	156
	157	iounmap(priv->regs);
	158	for (i=0; i<PHY_MAX_ADDR; i++)
	159	if (bus->irq[i])
	160	irq_dispose_mapping(bus->irq[i]);
	161	kfree(priv);
	162	kfree(bus->irq);
298cf9be	163	mdiobus_free(bus);
5d031e9e DP	164
	165	return 0;
	166	}
	167
	168
	169	static struct of_device_id mpc52xx_fec_mdio_match[] = {
66ffbe49	170	{ .compatible = "fsl,mpc5200b-mdio", },
8d813941	171	{ .compatible = "fsl,mpc5200-mdio", },
66ffbe49 GL	172	{ .compatible = "mpc5200b-fec-phy", },
66ffbe49 GL	173	{}
5d031e9e DP	174	};
	175
	176	struct of_platform_driver mpc52xx_fec_mdio_driver = {
	177	.name = "mpc5200b-fec-phy",
	178	.probe = mpc52xx_fec_mdio_probe,
	179	.remove = mpc52xx_fec_mdio_remove,
	180	.match_table = mpc52xx_fec_mdio_match,
	181	};
	182
	183	/* let fec driver call it, since this has to be registered before it */
	184	EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
	185
	186
	187	MODULE_LICENSE("Dual BSD/GPL");