[mirror_ubuntu-zesty-kernel.git] / drivers / phy / phy-mvebu-sata.c

/*
 *	phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
 *
 *	Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
 *
 *	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/module.h>
#include <linux/clk.h>
#include <linux/phy/phy.h>
#include <linux/io.h>
#include <linux/platform_device.h>

struct priv {
	struct clk	*clk;
	void __iomem	*base;
};

#define SATA_PHY_MODE_2	0x0330
#define  MODE_2_FORCE_PU_TX	BIT(0)
#define  MODE_2_FORCE_PU_RX	BIT(1)
#define  MODE_2_PU_PLL		BIT(2)
#define  MODE_2_PU_IVREF	BIT(3)
#define SATA_IF_CTRL	0x0050
#define  CTRL_PHY_SHUTDOWN	BIT(9)

static int phy_mvebu_sata_power_on(struct phy *phy)
{
	struct priv *priv = phy_get_drvdata(phy);
	u32 reg;

	clk_prepare_enable(priv->clk);

	/* Enable PLL and IVREF */
	reg = readl(priv->base + SATA_PHY_MODE_2);
	reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
		MODE_2_PU_PLL | MODE_2_PU_IVREF);
	writel(reg , priv->base + SATA_PHY_MODE_2);

	/* Enable PHY */
	reg = readl(priv->base + SATA_IF_CTRL);
	reg &= ~CTRL_PHY_SHUTDOWN;
	writel(reg, priv->base + SATA_IF_CTRL);

	clk_disable_unprepare(priv->clk);

	return 0;
}

static int phy_mvebu_sata_power_off(struct phy *phy)
{
	struct priv *priv = phy_get_drvdata(phy);
	u32 reg;

	clk_prepare_enable(priv->clk);

	/* Disable PLL and IVREF */
	reg = readl(priv->base + SATA_PHY_MODE_2);
	reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
		 MODE_2_PU_PLL | MODE_2_PU_IVREF);
	writel(reg, priv->base + SATA_PHY_MODE_2);

	/* Disable PHY */
	reg = readl(priv->base + SATA_IF_CTRL);
	reg |= CTRL_PHY_SHUTDOWN;
	writel(reg, priv->base + SATA_IF_CTRL);

	clk_disable_unprepare(priv->clk);

	return 0;
}

static const struct phy_ops phy_mvebu_sata_ops = {
	.power_on	= phy_mvebu_sata_power_on,
	.power_off	= phy_mvebu_sata_power_off,
	.owner		= THIS_MODULE,
};

static int phy_mvebu_sata_probe(struct platform_device *pdev)
{
	struct phy_provider *phy_provider;
	struct resource *res;
	struct priv *priv;
	struct phy *phy;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(priv->base))
		return PTR_ERR(priv->base);

	priv->clk = devm_clk_get(&pdev->dev, "sata");
	if (IS_ERR(priv->clk))
		return PTR_ERR(priv->clk);

	phy = devm_phy_create(&pdev->dev, NULL, &phy_mvebu_sata_ops);
	if (IS_ERR(phy))
		return PTR_ERR(phy);

	phy_set_drvdata(phy, priv);

	phy_provider = devm_of_phy_provider_register(&pdev->dev,
						     of_phy_simple_xlate);
	if (IS_ERR(phy_provider))
		return PTR_ERR(phy_provider);

	/* The boot loader may of left it on. Turn it off. */
	phy_mvebu_sata_power_off(phy);

	return 0;
}

static const struct of_device_id phy_mvebu_sata_of_match[] = {
	{ .compatible = "marvell,mvebu-sata-phy" },
	{ },
};
MODULE_DEVICE_TABLE(of, phy_mvebu_sata_of_match);

static struct platform_driver phy_mvebu_sata_driver = {
	.probe	= phy_mvebu_sata_probe,
	.driver = {
		.name	= "phy-mvebu-sata",
		.of_match_table	= phy_mvebu_sata_of_match,
	}
};
module_platform_driver(phy_mvebu_sata_driver);

MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
MODULE_DESCRIPTION("Marvell MVEBU SATA PHY driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
e3eae857 AL	1	/*
	2	* phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
	3	*
	4	* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/module.h>
	14	#include <linux/clk.h>
	15	#include <linux/phy/phy.h>
	16	#include <linux/io.h>
	17	#include <linux/platform_device.h>
	18
	19	struct priv {
	20	struct clk *clk;
	21	void __iomem *base;
	22	};
	23
	24	#define SATA_PHY_MODE_2 0x0330
	25	#define MODE_2_FORCE_PU_TX BIT(0)
	26	#define MODE_2_FORCE_PU_RX BIT(1)
	27	#define MODE_2_PU_PLL BIT(2)
	28	#define MODE_2_PU_IVREF BIT(3)
	29	#define SATA_IF_CTRL 0x0050
	30	#define CTRL_PHY_SHUTDOWN BIT(9)
	31
	32	static int phy_mvebu_sata_power_on(struct phy *phy)
	33	{
	34	struct priv *priv = phy_get_drvdata(phy);
	35	u32 reg;
	36
	37	clk_prepare_enable(priv->clk);
	38
	39	/* Enable PLL and IVREF */
	40	reg = readl(priv->base + SATA_PHY_MODE_2);
	41	reg \|= (MODE_2_FORCE_PU_TX \| MODE_2_FORCE_PU_RX \|
	42	MODE_2_PU_PLL \| MODE_2_PU_IVREF);
	43	writel(reg , priv->base + SATA_PHY_MODE_2);
	44
	45	/* Enable PHY */
	46	reg = readl(priv->base + SATA_IF_CTRL);
	47	reg &= ~CTRL_PHY_SHUTDOWN;
	48	writel(reg, priv->base + SATA_IF_CTRL);
	49
	50	clk_disable_unprepare(priv->clk);
	51
	52	return 0;
	53	}
	54
	55	static int phy_mvebu_sata_power_off(struct phy *phy)
	56	{
	57	struct priv *priv = phy_get_drvdata(phy);
	58	u32 reg;
	59
	60	clk_prepare_enable(priv->clk);
	61
	62	/* Disable PLL and IVREF */
	63	reg = readl(priv->base + SATA_PHY_MODE_2);
	64	reg &= ~(MODE_2_FORCE_PU_TX \| MODE_2_FORCE_PU_RX \|
65	MODE_2_PU_PLL \| MODE_2_PU_IVREF);
66	writel(reg, priv->base + SATA_PHY_MODE_2);
67
68	/* Disable PHY */
69	reg = readl(priv->base + SATA_IF_CTRL);
70	reg \|= CTRL_PHY_SHUTDOWN;
71	writel(reg, priv->base + SATA_IF_CTRL);
72
73	clk_disable_unprepare(priv->clk);
74
75	return 0;
76	}
77
4a9e5ca1	78	static const struct phy_ops phy_mvebu_sata_ops = {
e3eae857 AL	79	.power_on = phy_mvebu_sata_power_on,
	80	.power_off = phy_mvebu_sata_power_off,
	81	.owner = THIS_MODULE,
	82	};
	83
	84	static int phy_mvebu_sata_probe(struct platform_device *pdev)
	85	{
	86	struct phy_provider *phy_provider;
	87	struct resource *res;
	88	struct priv *priv;
	89	struct phy *phy;
	90
	91	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
1f8de849 PG	92	if (!priv)
1f8de849 PG	93	return -ENOMEM;
e3eae857 AL	94
	95	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	96	priv->base = devm_ioremap_resource(&pdev->dev, res);
	97	if (IS_ERR(priv->base))
	98	return PTR_ERR(priv->base);
	99
	100	priv->clk = devm_clk_get(&pdev->dev, "sata");
	101	if (IS_ERR(priv->clk))
	102	return PTR_ERR(priv->clk);
	103
dbc98635	104	phy = devm_phy_create(&pdev->dev, NULL, &phy_mvebu_sata_ops);
e3eae857 AL	105	if (IS_ERR(phy))
	106	return PTR_ERR(phy);
	107
	108	phy_set_drvdata(phy, priv);
	109
64fe1891 KVA	110	phy_provider = devm_of_phy_provider_register(&pdev->dev,
	111	of_phy_simple_xlate);
	112	if (IS_ERR(phy_provider))
	113	return PTR_ERR(phy_provider);
	114
e3eae857 AL	115	/* The boot loader may of left it on. Turn it off. */
	116	phy_mvebu_sata_power_off(phy);
	117
	118	return 0;
	119	}
	120
	121	static const struct of_device_id phy_mvebu_sata_of_match[] = {
	122	{ .compatible = "marvell,mvebu-sata-phy" },
	123	{ },
	124	};
	125	MODULE_DEVICE_TABLE(of, phy_mvebu_sata_of_match);
	126
	127	static struct platform_driver phy_mvebu_sata_driver = {
	128	.probe = phy_mvebu_sata_probe,
	129	.driver = {
	130	.name = "phy-mvebu-sata",
e3eae857 AL	131	.of_match_table = phy_mvebu_sata_of_match,
	132	}
	133	};
	134	module_platform_driver(phy_mvebu_sata_driver);
	135
	136	MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
	137	MODULE_DESCRIPTION("Marvell MVEBU SATA PHY driver");
	138	MODULE_LICENSE("GPL v2");