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

/*
 * Broadcom UniMAC MDIO bus controller driver
 *
 * Copyright (C) 2014, Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/delay.h>

#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_mdio.h>

#define MDIO_CMD		0x00
#define  MDIO_START_BUSY	(1 << 29)
#define  MDIO_READ_FAIL		(1 << 28)
#define  MDIO_RD		(2 << 26)
#define  MDIO_WR		(1 << 26)
#define  MDIO_PMD_SHIFT		21
#define  MDIO_PMD_MASK		0x1F
#define  MDIO_REG_SHIFT		16
#define  MDIO_REG_MASK		0x1F

#define MDIO_CFG		0x04
#define  MDIO_C22		(1 << 0)
#define  MDIO_C45		0
#define  MDIO_CLK_DIV_SHIFT	4
#define  MDIO_CLK_DIV_MASK	0x3F
#define  MDIO_SUPP_PREAMBLE	(1 << 12)

struct unimac_mdio_priv {
	struct mii_bus		*mii_bus;
	void __iomem		*base;
};

static inline void unimac_mdio_start(struct unimac_mdio_priv *priv)
{
	u32 reg;

	reg = __raw_readl(priv->base + MDIO_CMD);
	reg |= MDIO_START_BUSY;
	__raw_writel(reg, priv->base + MDIO_CMD);
}

static inline unsigned int unimac_mdio_busy(struct unimac_mdio_priv *priv)
{
	return __raw_readl(priv->base + MDIO_CMD) & MDIO_START_BUSY;
}

static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
{
	struct unimac_mdio_priv *priv = bus->priv;
	unsigned int timeout = 1000;
	u32 cmd;

	/* Prepare the read operation */
	cmd = MDIO_RD | (phy_id << MDIO_PMD_SHIFT) | (reg << MDIO_REG_SHIFT);
	__raw_writel(cmd, priv->base + MDIO_CMD);

	/* Start MDIO transaction */
	unimac_mdio_start(priv);

	do {
		if (!unimac_mdio_busy(priv))
			break;

		usleep_range(1000, 2000);
	} while (timeout--);

	if (!timeout)
		return -ETIMEDOUT;

	cmd = __raw_readl(priv->base + MDIO_CMD);
	if (cmd & MDIO_READ_FAIL)
		return -EIO;

	return cmd & 0xffff;
}

static int unimac_mdio_write(struct mii_bus *bus, int phy_id,
			     int reg, u16 val)
{
	struct unimac_mdio_priv *priv = bus->priv;
	unsigned int timeout = 1000;
	u32 cmd;

	/* Prepare the write operation */
	cmd = MDIO_WR | (phy_id << MDIO_PMD_SHIFT) |
		(reg << MDIO_REG_SHIFT) | (0xffff & val);
	__raw_writel(cmd, priv->base + MDIO_CMD);

	unimac_mdio_start(priv);

	do {
		if (!unimac_mdio_busy(priv))
			break;

		usleep_range(1000, 2000);
	} while (timeout--);

	if (!timeout)
		return -ETIMEDOUT;

	return 0;
}

static int unimac_mdio_probe(struct platform_device *pdev)
{
	struct unimac_mdio_priv *priv;
	struct device_node *np;
	struct mii_bus *bus;
	struct resource *r;
	int ret;

	np = pdev->dev.of_node;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	/* Just ioremap, as this MDIO block is usually integrated into an
	 * Ethernet MAC controller register range
	 */
	priv->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
	if (!priv->base) {
		dev_err(&pdev->dev, "failed to remap register\n");
		return -ENOMEM;
	}

	priv->mii_bus = mdiobus_alloc();
	if (!priv->mii_bus)
		return -ENOMEM;

	bus = priv->mii_bus;
	bus->priv = priv;
	bus->name = "unimac MII bus";
	bus->parent = &pdev->dev;
	bus->read = unimac_mdio_read;
	bus->write = unimac_mdio_write;
	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);

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

	ret = of_mdiobus_register(bus, np);
	if (ret) {
		dev_err(&pdev->dev, "MDIO bus registration failed\n");
		goto out_mdio_irq;
	}

	platform_set_drvdata(pdev, priv);

	dev_info(&pdev->dev, "Broadcom UniMAC MDIO bus at 0x%p\n", priv->base);

	return 0;

out_mdio_irq:
	kfree(bus->irq);
out_mdio_free:
	mdiobus_free(bus);
	return ret;
}

static int unimac_mdio_remove(struct platform_device *pdev)
{
	struct unimac_mdio_priv *priv = platform_get_drvdata(pdev);

	mdiobus_unregister(priv->mii_bus);
	kfree(priv->mii_bus->irq);
	mdiobus_free(priv->mii_bus);

	return 0;
}

static struct of_device_id unimac_mdio_ids[] = {
	{ .compatible = "brcm,genet-mdio-v4", },
	{ .compatible = "brcm,genet-mdio-v3", },
	{ .compatible = "brcm,genet-mdio-v2", },
	{ .compatible = "brcm,genet-mdio-v1", },
	{ .compatible = "brcm,unimac-mdio", },
	{ /* sentinel */ },
};

static struct platform_driver unimac_mdio_driver = {
	.driver = {
		.name = "unimac-mdio",
		.owner = THIS_MODULE,
		.of_match_table = unimac_mdio_ids,
	},
	.probe	= unimac_mdio_probe,
	.remove	= unimac_mdio_remove,
};
module_platform_driver(unimac_mdio_driver);

MODULE_AUTHOR("Broadcom Corporation");
MODULE_DESCRIPTION("Broadcom UniMAC MDIO bus controller");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:unimac-mdio");
Commit	Line	Data
2ba1b163 FF	1	/*
	2	* Broadcom UniMAC MDIO bus controller driver
	3	*
	4	* Copyright (C) 2014, Broadcom Corporation
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/phy.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/sched.h>
	16	#include <linux/module.h>
	17	#include <linux/io.h>
	18	#include <linux/delay.h>
	19
	20	#include <linux/of.h>
	21	#include <linux/of_platform.h>
	22	#include <linux/of_mdio.h>
	23
	24	#define MDIO_CMD 0x00
	25	#define MDIO_START_BUSY (1 << 29)
	26	#define MDIO_READ_FAIL (1 << 28)
	27	#define MDIO_RD (2 << 26)
	28	#define MDIO_WR (1 << 26)
	29	#define MDIO_PMD_SHIFT 21
	30	#define MDIO_PMD_MASK 0x1F
	31	#define MDIO_REG_SHIFT 16
	32	#define MDIO_REG_MASK 0x1F
	33
	34	#define MDIO_CFG 0x04
	35	#define MDIO_C22 (1 << 0)
	36	#define MDIO_C45 0
	37	#define MDIO_CLK_DIV_SHIFT 4
	38	#define MDIO_CLK_DIV_MASK 0x3F
	39	#define MDIO_SUPP_PREAMBLE (1 << 12)
	40
	41	struct unimac_mdio_priv {
	42	struct mii_bus *mii_bus;
	43	void __iomem *base;
	44	};
	45
	46	static inline void unimac_mdio_start(struct unimac_mdio_priv *priv)
	47	{
	48	u32 reg;
	49
	50	reg = __raw_readl(priv->base + MDIO_CMD);
	51	reg \|= MDIO_START_BUSY;
	52	__raw_writel(reg, priv->base + MDIO_CMD);
	53	}
	54
	55	static inline unsigned int unimac_mdio_busy(struct unimac_mdio_priv *priv)
	56	{
	57	return __raw_readl(priv->base + MDIO_CMD) & MDIO_START_BUSY;
	58	}
	59
	60	static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
	61	{
	62	struct unimac_mdio_priv *priv = bus->priv;
	63	unsigned int timeout = 1000;
	64	u32 cmd;
65
66	/* Prepare the read operation */
67	cmd = MDIO_RD \| (phy_id << MDIO_PMD_SHIFT) \| (reg << MDIO_REG_SHIFT);
68	__raw_writel(cmd, priv->base + MDIO_CMD);
69
70	/* Start MDIO transaction */
71	unimac_mdio_start(priv);
72
73	do {
74	if (!unimac_mdio_busy(priv))
75	break;
76
77	usleep_range(1000, 2000);
78	} while (timeout--);
79
80	if (!timeout)
81	return -ETIMEDOUT;
82
83	cmd = __raw_readl(priv->base + MDIO_CMD);
84	if (cmd & MDIO_READ_FAIL)
85	return -EIO;
86
87	return cmd & 0xffff;
88	}
89
90	static int unimac_mdio_write(struct mii_bus *bus, int phy_id,
91	int reg, u16 val)
92	{
93	struct unimac_mdio_priv *priv = bus->priv;
94	unsigned int timeout = 1000;
95	u32 cmd;
96
97	/* Prepare the write operation */
98	cmd = MDIO_WR \| (phy_id << MDIO_PMD_SHIFT) \|
99	(reg << MDIO_REG_SHIFT) \| (0xffff & val);
100	__raw_writel(cmd, priv->base + MDIO_CMD);
101
102	unimac_mdio_start(priv);
103
104	do {
105	if (!unimac_mdio_busy(priv))
106	break;
107
108	usleep_range(1000, 2000);
109	} while (timeout--);
110
111	if (!timeout)
112	return -ETIMEDOUT;
113
114	return 0;
115	}
116
117	static int unimac_mdio_probe(struct platform_device *pdev)
118	{
119	struct unimac_mdio_priv *priv;
120	struct device_node *np;
121	struct mii_bus *bus;
122	struct resource *r;
123	int ret;
124
125	np = pdev->dev.of_node;
126
127	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
128	if (!priv)
129	return -ENOMEM;
130
131	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
132
133	/* Just ioremap, as this MDIO block is usually integrated into an
134	* Ethernet MAC controller register range
135	*/
136	priv->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
137	if (!priv->base) {
138	dev_err(&pdev->dev, "failed to remap register\n");
139	return -ENOMEM;
140	}
141
142	priv->mii_bus = mdiobus_alloc();
143	if (!priv->mii_bus)
144	return -ENOMEM;
145
146	bus = priv->mii_bus;
147	bus->priv = priv;
148	bus->name = "unimac MII bus";
149	bus->parent = &pdev->dev;
150	bus->read = unimac_mdio_read;
151	bus->write = unimac_mdio_write;
152	snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name);
153
154	bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);
155	if (!bus->irq) {
156	ret = -ENOMEM;
157	goto out_mdio_free;
158	}
159
160	ret = of_mdiobus_register(bus, np);
161	if (ret) {
162	dev_err(&pdev->dev, "MDIO bus registration failed\n");
163	goto out_mdio_irq;
164	}
165
166	platform_set_drvdata(pdev, priv);
167
168	dev_info(&pdev->dev, "Broadcom UniMAC MDIO bus at 0x%p\n", priv->base);
169
170	return 0;
171
172	out_mdio_irq:
173	kfree(bus->irq);
174	out_mdio_free:
175	mdiobus_free(bus);
176	return ret;
177	}
178
179	static int unimac_mdio_remove(struct platform_device *pdev)
180	{
181	struct unimac_mdio_priv *priv = platform_get_drvdata(pdev);
182
183	mdiobus_unregister(priv->mii_bus);
184	kfree(priv->mii_bus->irq);
185	mdiobus_free(priv->mii_bus);
186
187	return 0;
188	}
189
190	static struct of_device_id unimac_mdio_ids[] = {
191	{ .compatible = "brcm,genet-mdio-v4", },
192	{ .compatible = "brcm,genet-mdio-v3", },
193	{ .compatible = "brcm,genet-mdio-v2", },
194	{ .compatible = "brcm,genet-mdio-v1", },
195	{ .compatible = "brcm,unimac-mdio", },
4559154a	196	{ /* sentinel */ },
2ba1b163 FF	197	};
	198
	199	static struct platform_driver unimac_mdio_driver = {
	200	.driver = {
	201	.name = "unimac-mdio",
	202	.owner = THIS_MODULE,
	203	.of_match_table = unimac_mdio_ids,
	204	},
	205	.probe = unimac_mdio_probe,
	206	.remove = unimac_mdio_remove,
	207	};
	208	module_platform_driver(unimac_mdio_driver);
	209
	210	MODULE_AUTHOR("Broadcom Corporation");
	211	MODULE_DESCRIPTION("Broadcom UniMAC MDIO bus controller");
	212	MODULE_LICENSE("GPL");
	213	MODULE_ALIAS("platform:unimac-mdio");