[deliverable/linux.git] / drivers / net / phy / mdio-sun4i.c

/*
 * Allwinner EMAC MDIO interface driver
 *
 * Copyright 2012-2013 Stefan Roese <sr@denx.de>
 * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
 *
 * Based on the Linux driver provided by Allwinner:
 * Copyright (C) 1997  Sten Wang
 *
 * 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/init.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 EMAC_MAC_MCMD_REG	(0x00)
#define EMAC_MAC_MADR_REG	(0x04)
#define EMAC_MAC_MWTD_REG	(0x08)
#define EMAC_MAC_MRDD_REG	(0x0c)
#define EMAC_MAC_MIND_REG	(0x10)
#define EMAC_MAC_SSRR_REG	(0x14)

#define MDIO_TIMEOUT		(msecs_to_jiffies(100))

struct sun4i_mdio_data {
	void __iomem		*membase;
	struct regulator	*regulator;
};

static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
	struct sun4i_mdio_data *data = bus->priv;
	unsigned long start_jiffies;
	int value;

	/* issue the phy address and reg */
	writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);
	/* pull up the phy io line */
	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);

	/* Wait read complete */
	start_jiffies = jiffies;
	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
		if (time_after(start_jiffies,
			       start_jiffies + MDIO_TIMEOUT))
			return -ETIMEDOUT;
		msleep(1);
	}

	/* push down the phy io line */
	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
	/* and read data */
	value = readl(data->membase + EMAC_MAC_MRDD_REG);

	return value;
}

static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
			    u16 value)
{
	struct sun4i_mdio_data *data = bus->priv;
	unsigned long start_jiffies;

	/* issue the phy address and reg */
	writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);
	/* pull up the phy io line */
	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);

	/* Wait read complete */
	start_jiffies = jiffies;
	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
		if (time_after(start_jiffies,
			       start_jiffies + MDIO_TIMEOUT))
			return -ETIMEDOUT;
		msleep(1);
	}

	/* push down the phy io line */
	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
	/* and write data */
	writel(value, data->membase + EMAC_MAC_MWTD_REG);

	return 0;
}

static int sun4i_mdio_reset(struct mii_bus *bus)
{
	return 0;
}

static int sun4i_mdio_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct mii_bus *bus;
	struct sun4i_mdio_data *data;
	int ret, i;

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

	bus->name = "sun4i_mii_bus";
	bus->read = &sun4i_mdio_read;
	bus->write = &sun4i_mdio_write;
	bus->reset = &sun4i_mdio_reset;
	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
	bus->parent = &pdev->dev;

	bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
	if (!bus->irq) {
		ret = -ENOMEM;
		goto err_out_free_mdiobus;
	}

	for (i = 0; i < PHY_MAX_ADDR; i++)
		bus->irq[i] = PHY_POLL;

	data = bus->priv;
	data->membase = of_iomap(np, 0);
	if (!data->membase) {
		ret = -ENOMEM;
		goto err_out_free_mdio_irq;
	}

	data->regulator = devm_regulator_get(&pdev->dev, "phy");
	if (IS_ERR(data->regulator)) {
		if (PTR_ERR(data->regulator) == -EPROBE_DEFER)
			return -EPROBE_DEFER;

		dev_info(&pdev->dev, "no regulator found\n");
	} else {
		ret = regulator_enable(data->regulator);
		if (ret)
			goto err_out_free_mdio_irq;
	}

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

	platform_set_drvdata(pdev, bus);

	return 0;

err_out_disable_regulator:
	regulator_disable(data->regulator);
err_out_free_mdio_irq:
	kfree(bus->irq);
err_out_free_mdiobus:
	mdiobus_free(bus);
	return ret;
}

static int sun4i_mdio_remove(struct platform_device *pdev)
{
	struct mii_bus *bus = platform_get_drvdata(pdev);

	mdiobus_unregister(bus);
	kfree(bus->irq);
	mdiobus_free(bus);

	return 0;
}

static const struct of_device_id sun4i_mdio_dt_ids[] = {
	{ .compatible = "allwinner,sun4i-mdio" },
	{ }
};
MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids);

static struct platform_driver sun4i_mdio_driver = {
	.probe = sun4i_mdio_probe,
	.remove = sun4i_mdio_remove,
	.driver = {
		.name = "sun4i-mdio",
		.of_match_table = sun4i_mdio_dt_ids,
	},
};

module_platform_driver(sun4i_mdio_driver);

MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver");
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
4bdcb1dd MR	1	/*
	2	* Allwinner EMAC MDIO interface driver
	3	*
	4	* Copyright 2012-2013 Stefan Roese <sr@denx.de>
	5	* Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
	6	*
	7	* Based on the Linux driver provided by Allwinner:
	8	* Copyright (C) 1997 Sten Wang
	9	*
	10	* This file is licensed under the terms of the GNU General Public
	11	* License version 2. This program is licensed "as is" without any
	12	* warranty of any kind, whether express or implied.
	13	*/
	14
	15	#include <linux/delay.h>
	16	#include <linux/init.h>
	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/mutex.h>
	20	#include <linux/of_address.h>
	21	#include <linux/of_mdio.h>
	22	#include <linux/phy.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/regulator/consumer.h>
	25
	26	#define EMAC_MAC_MCMD_REG (0x00)
	27	#define EMAC_MAC_MADR_REG (0x04)
	28	#define EMAC_MAC_MWTD_REG (0x08)
	29	#define EMAC_MAC_MRDD_REG (0x0c)
	30	#define EMAC_MAC_MIND_REG (0x10)
	31	#define EMAC_MAC_SSRR_REG (0x14)
	32
	33	#define MDIO_TIMEOUT (msecs_to_jiffies(100))
	34
	35	struct sun4i_mdio_data {
	36	void __iomem *membase;
	37	struct regulator *regulator;
	38	};
	39
	40	static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
	41	{
	42	struct sun4i_mdio_data *data = bus->priv;
	43	unsigned long start_jiffies;
	44	int value;
	45
	46	/* issue the phy address and reg */
	47	writel((mii_id << 8) \| regnum, data->membase + EMAC_MAC_MADR_REG);
	48	/* pull up the phy io line */
	49	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
	50
	51	/* Wait read complete */
	52	start_jiffies = jiffies;
	53	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
	54	if (time_after(start_jiffies,
	55	start_jiffies + MDIO_TIMEOUT))
	56	return -ETIMEDOUT;
	57	msleep(1);
	58	}
	59
	60	/* push down the phy io line */
	61	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
	62	/* and read data */
	63	value = readl(data->membase + EMAC_MAC_MRDD_REG);
	64
65	return value;
66	}
67
68	static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
69	u16 value)
70	{
71	struct sun4i_mdio_data *data = bus->priv;
72	unsigned long start_jiffies;
73
74	/* issue the phy address and reg */
75	writel((mii_id << 8) \| regnum, data->membase + EMAC_MAC_MADR_REG);
76	/* pull up the phy io line */
77	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
78
79	/* Wait read complete */
80	start_jiffies = jiffies;
81	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
82	if (time_after(start_jiffies,
83	start_jiffies + MDIO_TIMEOUT))
84	return -ETIMEDOUT;
85	msleep(1);
86	}
87
88	/* push down the phy io line */
89	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
90	/* and write data */
91	writel(value, data->membase + EMAC_MAC_MWTD_REG);
92
93	return 0;
94	}
95
96	static int sun4i_mdio_reset(struct mii_bus *bus)
97	{
98	return 0;
99	}
100
101	static int sun4i_mdio_probe(struct platform_device *pdev)
102	{
103	struct device_node *np = pdev->dev.of_node;
104	struct mii_bus *bus;
105	struct sun4i_mdio_data *data;
106	int ret, i;
107
108	bus = mdiobus_alloc_size(sizeof(*data));
109	if (!bus)
110	return -ENOMEM;
111
112	bus->name = "sun4i_mii_bus";
113	bus->read = &sun4i_mdio_read;
114	bus->write = &sun4i_mdio_write;
115	bus->reset = &sun4i_mdio_reset;
116	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
117	bus->parent = &pdev->dev;
118
119	bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
120	if (!bus->irq) {
121	ret = -ENOMEM;
122	goto err_out_free_mdiobus;
123	}
124
125	for (i = 0; i < PHY_MAX_ADDR; i++)
126	bus->irq[i] = PHY_POLL;
127
128	data = bus->priv;
129	data->membase = of_iomap(np, 0);
130	if (!data->membase) {
131	ret = -ENOMEM;
132	goto err_out_free_mdio_irq;
133	}
134
135	data->regulator = devm_regulator_get(&pdev->dev, "phy");
136	if (IS_ERR(data->regulator)) {
137	if (PTR_ERR(data->regulator) == -EPROBE_DEFER)
138	return -EPROBE_DEFER;
139
140	dev_info(&pdev->dev, "no regulator found\n");
141	} else {
142	ret = regulator_enable(data->regulator);
143	if (ret)
144	goto err_out_free_mdio_irq;
145	}
146
147	ret = of_mdiobus_register(bus, np);
148	if (ret < 0)
149	goto err_out_disable_regulator;
150
151	platform_set_drvdata(pdev, bus);
152
153	return 0;
154
155	err_out_disable_regulator:
156	regulator_disable(data->regulator);
157	err_out_free_mdio_irq:
158	kfree(bus->irq);
159	err_out_free_mdiobus:
160	mdiobus_free(bus);
161	return ret;
162	}
163
164	static int sun4i_mdio_remove(struct platform_device *pdev)
165	{
166	struct mii_bus *bus = platform_get_drvdata(pdev);
167
168	mdiobus_unregister(bus);
169	kfree(bus->irq);
170	mdiobus_free(bus);
171
172	return 0;
173	}
174
175	static const struct of_device_id sun4i_mdio_dt_ids[] = {
176	{ .compatible = "allwinner,sun4i-mdio" },
177	{ }
178	};
179	MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids);
180
181	static struct platform_driver sun4i_mdio_driver = {
182	.probe = sun4i_mdio_probe,
183	.remove = sun4i_mdio_remove,
184	.driver = {
185	.name = "sun4i-mdio",
186	.of_match_table = sun4i_mdio_dt_ids,
187	},
188	};
189
190	module_platform_driver(sun4i_mdio_driver);
191
192	MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver");
193	MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
194	MODULE_LICENSE("GPL");