[linux-2.6-block.git] / drivers / net / phy / mdio-moxart.c

/* MOXA ART Ethernet (RTL8201CP) MDIO interface driver
 *
 * Copyright (C) 2013 Jonas Jensen <jonas.jensen@gmail.com>
 *
 * 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/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_address.h>
#include <linux/of_mdio.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>

#define REG_PHY_CTRL            0
#define REG_PHY_WRITE_DATA      4

/* REG_PHY_CTRL */
#define MIIWR                   BIT(27) /* init write sequence (auto cleared)*/
#define MIIRD                   BIT(26)
#define REGAD_MASK              0x3e00000
#define PHYAD_MASK              0x1f0000
#define MIIRDATA_MASK           0xffff

/* REG_PHY_WRITE_DATA */
#define MIIWDATA_MASK           0xffff

struct moxart_mdio_data {
	void __iomem		*base;
};

static int moxart_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
	struct moxart_mdio_data *data = bus->priv;
	u32 ctrl = 0;
	unsigned int count = 5;

	dev_dbg(&bus->dev, "%s\n", __func__);

	ctrl |= MIIRD | ((mii_id << 16) & PHYAD_MASK) |
		((regnum << 21) & REGAD_MASK);

	writel(ctrl, data->base + REG_PHY_CTRL);

	do {
		ctrl = readl(data->base + REG_PHY_CTRL);

		if (!(ctrl & MIIRD))
			return ctrl & MIIRDATA_MASK;

		mdelay(10);
		count--;
	} while (count > 0);

	dev_dbg(&bus->dev, "%s timed out\n", __func__);

	return -ETIMEDOUT;
}

static int moxart_mdio_write(struct mii_bus *bus, int mii_id,
			     int regnum, u16 value)
{
	struct moxart_mdio_data *data = bus->priv;
	u32 ctrl = 0;
	unsigned int count = 5;

	dev_dbg(&bus->dev, "%s\n", __func__);

	ctrl |= MIIWR | ((mii_id << 16) & PHYAD_MASK) |
		((regnum << 21) & REGAD_MASK);

	value &= MIIWDATA_MASK;

	writel(value, data->base + REG_PHY_WRITE_DATA);
	writel(ctrl, data->base + REG_PHY_CTRL);

	do {
		ctrl = readl(data->base + REG_PHY_CTRL);

		if (!(ctrl & MIIWR))
			return 0;

		mdelay(10);
		count--;
	} while (count > 0);

	dev_dbg(&bus->dev, "%s timed out\n", __func__);

	return -ETIMEDOUT;
}

static int moxart_mdio_reset(struct mii_bus *bus)
{
	int data, i;

	for (i = 0; i < PHY_MAX_ADDR; i++) {
		data = moxart_mdio_read(bus, i, MII_BMCR);
		if (data < 0)
			continue;

		data |= BMCR_RESET;
		if (moxart_mdio_write(bus, i, MII_BMCR, data) < 0)
			continue;
	}

	return 0;
}

static int moxart_mdio_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct mii_bus *bus;
	struct moxart_mdio_data *data;
	struct resource *res;
	int ret, i;

	bus = mdiobus_alloc_size(sizeof(*data));
	if (!bus)
		return -ENOMEM;

	bus->name = "MOXA ART Ethernet MII";
	bus->read = &moxart_mdio_read;
	bus->write = &moxart_mdio_write;
	bus->reset = &moxart_mdio_reset;
	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d-mii", pdev->name, pdev->id);
	bus->parent = &pdev->dev;

	/* Setting PHY_IGNORE_INTERRUPT here even if it has no effect,
	 * of_mdiobus_register() sets these PHY_POLL.
	 * Ideally, the interrupt from MAC controller could be used to
	 * detect link state changes, not polling, i.e. if there was
	 * a way phy_driver could set PHY_HAS_INTERRUPT but have that
	 * interrupt handled in ethernet drivercode.
	 */
	for (i = 0; i < PHY_MAX_ADDR; i++)
		bus->irq[i] = PHY_IGNORE_INTERRUPT;

	data = bus->priv;
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	data->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(data->base)) {
		ret = PTR_ERR(data->base);
		goto err_out_free_mdiobus;
	}

	ret = of_mdiobus_register(bus, np);
	if (ret < 0)
		goto err_out_free_mdiobus;

	platform_set_drvdata(pdev, bus);

	return 0;

err_out_free_mdiobus:
	mdiobus_free(bus);
	return ret;
}

static int moxart_mdio_remove(struct platform_device *pdev)
{
	struct mii_bus *bus = platform_get_drvdata(pdev);

	mdiobus_unregister(bus);
	mdiobus_free(bus);

	return 0;
}

static const struct of_device_id moxart_mdio_dt_ids[] = {
	{ .compatible = "moxa,moxart-mdio" },
	{ }
};
MODULE_DEVICE_TABLE(of, moxart_mdio_dt_ids);

static struct platform_driver moxart_mdio_driver = {
	.probe = moxart_mdio_probe,
	.remove = moxart_mdio_remove,
	.driver = {
		.name = "moxart-mdio",
		.of_match_table = moxart_mdio_dt_ids,
	},
};

module_platform_driver(moxart_mdio_driver);

MODULE_DESCRIPTION("MOXA ART MDIO interface driver");
MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
b0db7b0c JJ	1	/* MOXA ART Ethernet (RTL8201CP) MDIO interface driver
	2	*
	3	* Copyright (C) 2013 Jonas Jensen <jonas.jensen@gmail.com>
	4	*
	5	* This file is licensed under the terms of the GNU General Public
	6	* License version 2. This program is licensed "as is" without any
	7	* warranty of any kind, whether express or implied.
	8	*/
	9
	10	#include <linux/delay.h>
b0db7b0c JJ	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/mutex.h>
	14	#include <linux/of_address.h>
	15	#include <linux/of_mdio.h>
	16	#include <linux/phy.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/regulator/consumer.h>
	19
	20	#define REG_PHY_CTRL 0
	21	#define REG_PHY_WRITE_DATA 4
	22
	23	/* REG_PHY_CTRL */
	24	#define MIIWR BIT(27) /* init write sequence (auto cleared)*/
	25	#define MIIRD BIT(26)
	26	#define REGAD_MASK 0x3e00000
	27	#define PHYAD_MASK 0x1f0000
	28	#define MIIRDATA_MASK 0xffff
	29
	30	/* REG_PHY_WRITE_DATA */
	31	#define MIIWDATA_MASK 0xffff
	32
	33	struct moxart_mdio_data {
	34	void __iomem *base;
	35	};
	36
	37	static int moxart_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
	38	{
	39	struct moxart_mdio_data *data = bus->priv;
	40	u32 ctrl = 0;
	41	unsigned int count = 5;
	42
	43	dev_dbg(&bus->dev, "%s\n", __func__);
	44
	45	ctrl \|= MIIRD \| ((mii_id << 16) & PHYAD_MASK) \|
	46	((regnum << 21) & REGAD_MASK);
	47
	48	writel(ctrl, data->base + REG_PHY_CTRL);
	49
	50	do {
	51	ctrl = readl(data->base + REG_PHY_CTRL);
	52
	53	if (!(ctrl & MIIRD))
	54	return ctrl & MIIRDATA_MASK;
	55
	56	mdelay(10);
	57	count--;
	58	} while (count > 0);
	59
	60	dev_dbg(&bus->dev, "%s timed out\n", __func__);
	61
	62	return -ETIMEDOUT;
	63	}
	64
	65	static int moxart_mdio_write(struct mii_bus *bus, int mii_id,
	66	int regnum, u16 value)
	67	{
	68	struct moxart_mdio_data *data = bus->priv;
	69	u32 ctrl = 0;
	70	unsigned int count = 5;
	71
	72	dev_dbg(&bus->dev, "%s\n", __func__);
	73
	74	ctrl \|= MIIWR \| ((mii_id << 16) & PHYAD_MASK) \|
75	((regnum << 21) & REGAD_MASK);
76
77	value &= MIIWDATA_MASK;
78
79	writel(value, data->base + REG_PHY_WRITE_DATA);
80	writel(ctrl, data->base + REG_PHY_CTRL);
81
82	do {
83	ctrl = readl(data->base + REG_PHY_CTRL);
84
85	if (!(ctrl & MIIWR))
86	return 0;
87
88	mdelay(10);
89	count--;
90	} while (count > 0);
91
92	dev_dbg(&bus->dev, "%s timed out\n", __func__);
93
94	return -ETIMEDOUT;
95	}
96
97	static int moxart_mdio_reset(struct mii_bus *bus)
98	{
99	int data, i;
100
101	for (i = 0; i < PHY_MAX_ADDR; i++) {
102	data = moxart_mdio_read(bus, i, MII_BMCR);
103	if (data < 0)
104	continue;
105
106	data \|= BMCR_RESET;
107	if (moxart_mdio_write(bus, i, MII_BMCR, data) < 0)
108	continue;
109	}
110
111	return 0;
112	}
113
114	static int moxart_mdio_probe(struct platform_device *pdev)
115	{
116	struct device_node *np = pdev->dev.of_node;
117	struct mii_bus *bus;
118	struct moxart_mdio_data *data;
119	struct resource *res;
120	int ret, i;
121
122	bus = mdiobus_alloc_size(sizeof(*data));
123	if (!bus)
124	return -ENOMEM;
125
126	bus->name = "MOXA ART Ethernet MII";
127	bus->read = &moxart_mdio_read;
128	bus->write = &moxart_mdio_write;
129	bus->reset = &moxart_mdio_reset;
130	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d-mii", pdev->name, pdev->id);
131	bus->parent = &pdev->dev;
132
b0db7b0c JJ	133	/* Setting PHY_IGNORE_INTERRUPT here even if it has no effect,
	134	* of_mdiobus_register() sets these PHY_POLL.
	135	* Ideally, the interrupt from MAC controller could be used to
	136	* detect link state changes, not polling, i.e. if there was
	137	* a way phy_driver could set PHY_HAS_INTERRUPT but have that
	138	* interrupt handled in ethernet drivercode.
	139	*/
	140	for (i = 0; i < PHY_MAX_ADDR; i++)
	141	bus->irq[i] = PHY_IGNORE_INTERRUPT;
	142
	143	data = bus->priv;
	144	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	145	data->base = devm_ioremap_resource(&pdev->dev, res);
	146	if (IS_ERR(data->base)) {
	147	ret = PTR_ERR(data->base);
	148	goto err_out_free_mdiobus;
	149	}
	150
	151	ret = of_mdiobus_register(bus, np);
	152	if (ret < 0)
	153	goto err_out_free_mdiobus;
	154
	155	platform_set_drvdata(pdev, bus);
	156
	157	return 0;
	158
	159	err_out_free_mdiobus:
	160	mdiobus_free(bus);
	161	return ret;
	162	}
	163
	164	static int moxart_mdio_remove(struct platform_device *pdev)
	165	{
	166	struct mii_bus *bus = platform_get_drvdata(pdev);
	167
	168	mdiobus_unregister(bus);
	169	mdiobus_free(bus);
	170
	171	return 0;
	172	}
	173
	174	static const struct of_device_id moxart_mdio_dt_ids[] = {
	175	{ .compatible = "moxa,moxart-mdio" },
	176	{ }
	177	};
	178	MODULE_DEVICE_TABLE(of, moxart_mdio_dt_ids);
	179
	180	static struct platform_driver moxart_mdio_driver = {
	181	.probe = moxart_mdio_probe,
	182	.remove = moxart_mdio_remove,
	183	.driver = {
	184	.name = "moxart-mdio",
	185	.of_match_table = moxart_mdio_dt_ids,
	186	},
	187	};
	188
	189	module_platform_driver(moxart_mdio_driver);
	190
	191	MODULE_DESCRIPTION("MOXA ART MDIO interface driver");
	192	MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
	193	MODULE_LICENSE("GPL");