[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/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 timeout_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 */
	timeout_jiffies = jiffies + MDIO_TIMEOUT;
	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
		if (time_is_before_jiffies(timeout_jiffies))
			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 timeout_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 */
	timeout_jiffies = jiffies + MDIO_TIMEOUT;
	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
		if (time_is_before_jiffies(timeout_jiffies))
			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_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct mii_bus *bus;
	struct sun4i_mdio_data *data;
	struct resource *res;
	int ret;

	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;
	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
	bus->parent = &pdev->dev;

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

	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");
		data->regulator = NULL;
	} else {
		ret = regulator_enable(data->regulator);
		if (ret)
			goto err_out_free_mdiobus;
	}

	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:
	if (data->regulator)
		regulator_disable(data->regulator);
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);
	mdiobus_free(bus);

	return 0;
}

static const struct of_device_id sun4i_mdio_dt_ids[] = {
	{ .compatible = "allwinner,sun4i-a10-mdio" },

	/* Deprecated */
	{ .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>
4bdcb1dd MR	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/mutex.h>
	19	#include <linux/of_address.h>
	20	#include <linux/of_mdio.h>
	21	#include <linux/phy.h>
	22	#include <linux/platform_device.h>
	23	#include <linux/regulator/consumer.h>
	24
	25	#define EMAC_MAC_MCMD_REG (0x00)
	26	#define EMAC_MAC_MADR_REG (0x04)
	27	#define EMAC_MAC_MWTD_REG (0x08)
	28	#define EMAC_MAC_MRDD_REG (0x0c)
	29	#define EMAC_MAC_MIND_REG (0x10)
	30	#define EMAC_MAC_SSRR_REG (0x14)
	31
	32	#define MDIO_TIMEOUT (msecs_to_jiffies(100))
	33
	34	struct sun4i_mdio_data {
	35	void __iomem *membase;
	36	struct regulator *regulator;
	37	};
	38
	39	static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
	40	{
	41	struct sun4i_mdio_data *data = bus->priv;
2bf420a7	42	unsigned long timeout_jiffies;
4bdcb1dd MR	43	int value;
	44
	45	/* issue the phy address and reg */
	46	writel((mii_id << 8) \| regnum, data->membase + EMAC_MAC_MADR_REG);
	47	/* pull up the phy io line */
	48	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
	49
	50	/* Wait read complete */
2bf420a7	51	timeout_jiffies = jiffies + MDIO_TIMEOUT;
4bdcb1dd	52	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
2bf420a7	53	if (time_is_before_jiffies(timeout_jiffies))
4bdcb1dd MR	54	return -ETIMEDOUT;
	55	msleep(1);
	56	}
	57
	58	/* push down the phy io line */
	59	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
	60	/* and read data */
	61	value = readl(data->membase + EMAC_MAC_MRDD_REG);
	62
	63	return value;
	64	}
	65
	66	static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
	67	u16 value)
	68	{
	69	struct sun4i_mdio_data *data = bus->priv;
2bf420a7	70	unsigned long timeout_jiffies;
4bdcb1dd MR	71
	72	/* issue the phy address and reg */
	73	writel((mii_id << 8) \| regnum, data->membase + EMAC_MAC_MADR_REG);
	74	/* pull up the phy io line */
	75	writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
	76
	77	/* Wait read complete */
2bf420a7	78	timeout_jiffies = jiffies + MDIO_TIMEOUT;
4bdcb1dd	79	while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
2bf420a7	80	if (time_is_before_jiffies(timeout_jiffies))
4bdcb1dd MR	81	return -ETIMEDOUT;
	82	msleep(1);
	83	}
	84
	85	/* push down the phy io line */
	86	writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
	87	/* and write data */
	88	writel(value, data->membase + EMAC_MAC_MWTD_REG);
	89
	90	return 0;
	91	}
	92
4bdcb1dd MR	93	static int sun4i_mdio_probe(struct platform_device *pdev)
	94	{
	95	struct device_node *np = pdev->dev.of_node;
	96	struct mii_bus *bus;
	97	struct sun4i_mdio_data *data;
03536cc3	98	struct resource *res;
e7f4dc35	99	int ret;
4bdcb1dd MR	100
	101	bus = mdiobus_alloc_size(sizeof(*data));
	102	if (!bus)
	103	return -ENOMEM;
	104
	105	bus->name = "sun4i_mii_bus";
	106	bus->read = &sun4i_mdio_read;
	107	bus->write = &sun4i_mdio_write;
4bdcb1dd MR	108	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
	109	bus->parent = &pdev->dev;
	110
4bdcb1dd	111	data = bus->priv;
03536cc3 JZ	112	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	113	data->membase = devm_ioremap_resource(&pdev->dev, res);
	114	if (IS_ERR(data->membase)) {
	115	ret = PTR_ERR(data->membase);
	116	goto err_out_free_mdiobus;
4bdcb1dd MR	117	}
	118
	119	data->regulator = devm_regulator_get(&pdev->dev, "phy");
	120	if (IS_ERR(data->regulator)) {
	121	if (PTR_ERR(data->regulator) == -EPROBE_DEFER)
	122	return -EPROBE_DEFER;
	123
	124	dev_info(&pdev->dev, "no regulator found\n");
227f33be	125	data->regulator = NULL;
4bdcb1dd MR	126	} else {
	127	ret = regulator_enable(data->regulator);
	128	if (ret)
03536cc3	129	goto err_out_free_mdiobus;
4bdcb1dd MR	130	}
	131
	132	ret = of_mdiobus_register(bus, np);
	133	if (ret < 0)
	134	goto err_out_disable_regulator;
	135
	136	platform_set_drvdata(pdev, bus);
	137
	138	return 0;
	139
	140	err_out_disable_regulator:
227f33be DC	141	if (data->regulator)
227f33be DC	142	regulator_disable(data->regulator);
4bdcb1dd MR	143	err_out_free_mdiobus:
	144	mdiobus_free(bus);
	145	return ret;
	146	}
	147
	148	static int sun4i_mdio_remove(struct platform_device *pdev)
	149	{
	150	struct mii_bus *bus = platform_get_drvdata(pdev);
	151
	152	mdiobus_unregister(bus);
4bdcb1dd MR	153	mdiobus_free(bus);
	154
	155	return 0;
	156	}
	157
	158	static const struct of_device_id sun4i_mdio_dt_ids[] = {
efe20570 MR	159	{ .compatible = "allwinner,sun4i-a10-mdio" },
	160
	161	/* Deprecated */
4bdcb1dd MR	162	{ .compatible = "allwinner,sun4i-mdio" },
	163	{ }
	164	};
	165	MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids);
	166
	167	static struct platform_driver sun4i_mdio_driver = {
	168	.probe = sun4i_mdio_probe,
	169	.remove = sun4i_mdio_remove,
	170	.driver = {
	171	.name = "sun4i-mdio",
	172	.of_match_table = sun4i_mdio_dt_ids,
	173	},
	174	};
	175
	176	module_platform_driver(sun4i_mdio_driver);
	177
	178	MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver");
	179	MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
	180	MODULE_LICENSE("GPL");