Commit 4484f730 authored by Pramod Kumar's avatar Pramod Kumar Committed by David S. Miller
Browse files

phy: Add Northstar2 PCI Phy support 



Add PCI Phy support for Broadcom Northstar2 SoCs.  This driver uses the
interface from the iproc mdio mux driver to enable the devices
respective phys.

Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarJon Mason <jonmason@broadcom.com>
Signed-off-by: default avatarPramod Kumar <pramod.kumar@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 464e3b4b

drivers/phy/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -434,4 +434,12 @@ config PHY_CYGNUS_PCIE 


source "drivers/phy/tegra/Kconfig"



config PHY_NS2_PCIE

	tristate "Broadcom Northstar2 PCIe PHY driver"

	depends on OF && MDIO_BUS_MUX_BCM_IPROC

	select GENERIC_PHY

	default ARCH_BCM_IPROC

	help

	  Enable this to support the Broadcom Northstar2 PCIe PHY.

	  If unsure, say N.

endmenu

drivers/phy/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -53,5 +53,5 @@ obj-$(CONFIG_PHY_TUSB1210) += phy-tusb1210.o 
obj-$(CONFIG_PHY_BRCM_SATA)		+= phy-brcm-sata.o

obj-$(CONFIG_PHY_PISTACHIO_USB)		+= phy-pistachio-usb.o

obj-$(CONFIG_PHY_CYGNUS_PCIE)		+= phy-bcm-cygnus-pcie.o



obj-$(CONFIG_ARCH_TEGRA) += tegra/

obj-$(CONFIG_PHY_NS2_PCIE)		+= phy-bcm-ns2-pcie.o

drivers/phy/phy-bcm-ns2-pcie.c

0 → 100644
+115 −0
Original line number Diff line number Diff line 
/*

 * 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>



struct ns2_pci_phy {

	struct mdio_device *mdiodev;

	struct phy *phy;

};



#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 ns2_pci_phy *phy = phy_get_drvdata(p);

	int rc;



	/* select the AFE 100MHz block page */

	rc = mdiobus_write(phy->mdiodev->bus, phy->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(phy->mdiodev->bus, phy->mdiodev->addr,

			   PLL_CLK_AMP_OFFSET, PLL_CLK_AMP_2P05V);

	if (rc)

		goto err;



	return 0;



err:

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

	return rc;

}



static struct phy_ops ns2_pci_phy_ops = {

	.init = ns2_pci_phy_init,

};



static int ns2_pci_phy_probe(struct mdio_device *mdiodev)

{

	struct device *dev = &mdiodev->dev;

	struct phy_provider *provider;

	struct ns2_pci_phy *p;

	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);

	}



	p = devm_kmalloc(dev, sizeof(struct ns2_pci_phy),

			 GFP_KERNEL);

	if (!p)

		return -ENOMEM;



	p->mdiodev = mdiodev;

	dev_set_drvdata(dev, p);



	p->phy = phy;

	phy_set_drvdata(phy, p);



	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");