[linux-2.6-block.git] / drivers / phy / phy-bcm-ns2-pcie.c

/*
 * Copyright (C) 2016 Broadcom
 *
 * 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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/of_mdio.h>
#include <linux/mdio.h>
#include <linux/phy.h>
#include <linux/phy/phy.h>

#define BLK_ADDR_REG_OFFSET	0x1f
#define PLL_AFE1_100MHZ_BLK	0x2100
#define PLL_CLK_AMP_OFFSET	0x03
#define PLL_CLK_AMP_2P05V	0x2b18

static int ns2_pci_phy_init(struct phy *p)
{
	struct mdio_device *mdiodev = phy_get_drvdata(p);
	int rc;

	/* select the AFE 100MHz block page */
	rc = mdiobus_write(mdiodev->bus, mdiodev->addr,
			   BLK_ADDR_REG_OFFSET, PLL_AFE1_100MHZ_BLK);
	if (rc)
		goto err;

	/* set the 100 MHz reference clock amplitude to 2.05 v */
	rc = mdiobus_write(mdiodev->bus, mdiodev->addr,
			   PLL_CLK_AMP_OFFSET, PLL_CLK_AMP_2P05V);
	if (rc)
		goto err;

	return 0;

err:
	dev_err(&mdiodev->dev, "Error %d writing to phy\n", rc);
	return rc;
}

static const struct phy_ops ns2_pci_phy_ops = {
	.init = ns2_pci_phy_init,
	.owner = THIS_MODULE,
};

static int ns2_pci_phy_probe(struct mdio_device *mdiodev)
{
	struct device *dev = &mdiodev->dev;
	struct phy_provider *provider;
	struct phy *phy;

	phy = devm_phy_create(dev, dev->of_node, &ns2_pci_phy_ops);
	if (IS_ERR(phy)) {
		dev_err(dev, "failed to create Phy\n");
		return PTR_ERR(phy);
	}

	phy_set_drvdata(phy, mdiodev);

	provider = devm_of_phy_provider_register(&phy->dev,
						 of_phy_simple_xlate);
	if (IS_ERR(provider)) {
		dev_err(dev, "failed to register Phy provider\n");
		return PTR_ERR(provider);
	}

	dev_info(dev, "%s PHY registered\n", dev_name(dev));

	return 0;
}

static const struct of_device_id ns2_pci_phy_of_match[] = {
	{ .compatible = "brcm,ns2-pcie-phy", },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ns2_pci_phy_of_match);

static struct mdio_driver ns2_pci_phy_driver = {
	.mdiodrv = {
		.driver = {
			.name = "phy-bcm-ns2-pci",
			.of_match_table = ns2_pci_phy_of_match,
		},
	},
	.probe = ns2_pci_phy_probe,
};
mdio_module_driver(ns2_pci_phy_driver);

MODULE_AUTHOR("Broadcom");
MODULE_DESCRIPTION("Broadcom Northstar2 PCI Phy driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:phy-bcm-ns2-pci");
Commit	Line	Data
4484f730 PK	1	/*
	2	* Copyright (C) 2016 Broadcom
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License as
	6	* published by the Free Software Foundation version 2.
	7	*
	8	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	9	* kind, whether express or implied; without even the implied warranty
	10	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*/
	13
	14	#include <linux/device.h>
	15	#include <linux/module.h>
	16	#include <linux/of_mdio.h>
	17	#include <linux/mdio.h>
	18	#include <linux/phy.h>
	19	#include <linux/phy/phy.h>
	20
4484f730 PK	21	#define BLK_ADDR_REG_OFFSET 0x1f
	22	#define PLL_AFE1_100MHZ_BLK 0x2100
	23	#define PLL_CLK_AMP_OFFSET 0x03
	24	#define PLL_CLK_AMP_2P05V 0x2b18
	25
	26	static int ns2_pci_phy_init(struct phy *p)
	27	{
b9d0397f	28	struct mdio_device *mdiodev = phy_get_drvdata(p);
4484f730 PK	29	int rc;
	30
	31	/* select the AFE 100MHz block page */
b9d0397f	32	rc = mdiobus_write(mdiodev->bus, mdiodev->addr,
4484f730 PK	33	BLK_ADDR_REG_OFFSET, PLL_AFE1_100MHZ_BLK);
	34	if (rc)
	35	goto err;
	36
	37	/* set the 100 MHz reference clock amplitude to 2.05 v */
b9d0397f	38	rc = mdiobus_write(mdiodev->bus, mdiodev->addr,
4484f730 PK	39	PLL_CLK_AMP_OFFSET, PLL_CLK_AMP_2P05V);
	40	if (rc)
	41	goto err;
	42
	43	return 0;
	44
	45	err:
b9d0397f	46	dev_err(&mdiodev->dev, "Error %d writing to phy\n", rc);
4484f730 PK	47	return rc;
	48	}
	49
5ed0e741	50	static const struct phy_ops ns2_pci_phy_ops = {
4484f730	51	.init = ns2_pci_phy_init,
5ed0e741	52	.owner = THIS_MODULE,
4484f730 PK	53	};
	54
	55	static int ns2_pci_phy_probe(struct mdio_device *mdiodev)
	56	{
	57	struct device *dev = &mdiodev->dev;
	58	struct phy_provider *provider;
4484f730 PK	59	struct phy *phy;
	60
	61	phy = devm_phy_create(dev, dev->of_node, &ns2_pci_phy_ops);
	62	if (IS_ERR(phy)) {
	63	dev_err(dev, "failed to create Phy\n");
	64	return PTR_ERR(phy);
	65	}
	66
b9d0397f	67	phy_set_drvdata(phy, mdiodev);
4484f730 PK	68
	69	provider = devm_of_phy_provider_register(&phy->dev,
	70	of_phy_simple_xlate);
	71	if (IS_ERR(provider)) {
	72	dev_err(dev, "failed to register Phy provider\n");
	73	return PTR_ERR(provider);
	74	}
	75
	76	dev_info(dev, "%s PHY registered\n", dev_name(dev));
	77
	78	return 0;
	79	}
	80
	81	static const struct of_device_id ns2_pci_phy_of_match[] = {
	82	{ .compatible = "brcm,ns2-pcie-phy", },
	83	{ /* sentinel */ },
	84	};
	85	MODULE_DEVICE_TABLE(of, ns2_pci_phy_of_match);
	86
	87	static struct mdio_driver ns2_pci_phy_driver = {
	88	.mdiodrv = {
	89	.driver = {
	90	.name = "phy-bcm-ns2-pci",
	91	.of_match_table = ns2_pci_phy_of_match,
	92	},
	93	},
	94	.probe = ns2_pci_phy_probe,
	95	};
	96	mdio_module_driver(ns2_pci_phy_driver);
	97
	98	MODULE_AUTHOR("Broadcom");
	99	MODULE_DESCRIPTION("Broadcom Northstar2 PCI Phy driver");
	100	MODULE_LICENSE("GPL v2");
	101	MODULE_ALIAS("platform:phy-bcm-ns2-pci");