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Commit e9976d7c authored by David Daney's avatar David Daney Committed by David S. Miller
Browse files

netdev/phy: Add driver for Broadcom BCM87XX 10G Ethernet PHYs 



Add a driver for BCM8706 and BCM8727 devices.  These are a 10Gig PHYs
which use MII_ADDR_C45 addressing.  They are always 10G full duplex, so
there is no autonegotiation.  All we do is report link state and send
interrupts when it changes.

If the PHY has a device tree of_node associated with it, the
"broadcom,c45-reg-init" property is used to supply register
initialization values when config_init() is called.

Signed-off-by: default avatarDavid Daney <david.daney@cavium.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a30e2c18

Documentation/devicetree/bindings/net/broadcom-bcm87xx.txt

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The Broadcom BCM87XX devices are a family of 10G Ethernet PHYs.  They

have these bindings in addition to the standard PHY bindings.



Compatible: Should contain "broadcom,bcm8706" or "broadcom,bcm8727" and

            "ethernet-phy-ieee802.3-c45"



Optional Properties:



- broadcom,c45-reg-init : one of more sets of 4 cells.  The first cell

  is the MDIO Manageable Device (MMD) address, the second a register

  address within the MMD, the third cell contains a mask to be ANDed

  with the existing register value, and the fourth cell is ORed with

  he result to yield the new register value.  If the third cell has a

  value of zero, no read of the existing value is performed.



Example:



	ethernet-phy@5 {

		reg = <5>;

		compatible = "broadcom,bcm8706", "ethernet-phy-ieee802.3-c45";

		interrupt-parent = <&gpio>;

		interrupts = <12 8>; /* Pin 12, active low */

		/*

		 * Set PMD Digital Control Register for

		 * GPIO[1] Tx/Rx

		 * GPIO[0] R64 Sync Acquired

		 */

		broadcom,c45-reg-init = <1 0xc808 0xff8f 0x70>;

	};

drivers/net/phy/Kconfig

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@@ -67,6 +67,11 @@ config BCM63XX_PHY 
	---help---

	  Currently supports the 6348 and 6358 PHYs.



config BCM87XX_PHY

	tristate "Driver for Broadcom BCM8706 and BCM8727 PHYs"

	help

	  Currently supports the BCM8706 and BCM8727 10G Ethernet PHYs.



config ICPLUS_PHY

	tristate "Drivers for ICPlus PHYs"

	---help---

drivers/net/phy/Makefile

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@@ -12,6 +12,7 @@ obj-$(CONFIG_SMSC_PHY) += smsc.o 
obj-$(CONFIG_VITESSE_PHY)	+= vitesse.o

obj-$(CONFIG_BROADCOM_PHY)	+= broadcom.o

obj-$(CONFIG_BCM63XX_PHY)	+= bcm63xx.o

obj-$(CONFIG_BCM87XX_PHY)	+= bcm87xx.o

obj-$(CONFIG_ICPLUS_PHY)	+= icplus.o

obj-$(CONFIG_REALTEK_PHY)	+= realtek.o

obj-$(CONFIG_LSI_ET1011C_PHY)	+= et1011c.o

drivers/net/phy/bcm87xx.c

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/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 2011 - 2012 Cavium, Inc.

 */



#include <linux/module.h>

#include <linux/phy.h>

#include <linux/of.h>



#define PHY_ID_BCM8706	0x0143bdc1

#define PHY_ID_BCM8727	0x0143bff0



#define BCM87XX_PMD_RX_SIGNAL_DETECT	(MII_ADDR_C45 | 0x1000a)

#define BCM87XX_10GBASER_PCS_STATUS	(MII_ADDR_C45 | 0x30020)

#define BCM87XX_XGXS_LANE_STATUS	(MII_ADDR_C45 | 0x40018)



#define BCM87XX_LASI_CONTROL (MII_ADDR_C45 | 0x39002)

#define BCM87XX_LASI_STATUS (MII_ADDR_C45 | 0x39005)



#if IS_ENABLED(CONFIG_OF_MDIO)

/* Set and/or override some configuration registers based on the

 * marvell,reg-init property stored in the of_node for the phydev.

 *

 * broadcom,c45-reg-init = <devid reg mask value>,...;

 *

 * There may be one or more sets of <devid reg mask value>:

 *

 * devid: which sub-device to use.

 * reg: the register.

 * mask: if non-zero, ANDed with existing register value.

 * value: ORed with the masked value and written to the regiser.

 *

 */

static int bcm87xx_of_reg_init(struct phy_device *phydev)

{

	const __be32 *paddr;

	const __be32 *paddr_end;

	int len, ret;



	if (!phydev->dev.of_node)

		return 0;



	paddr = of_get_property(phydev->dev.of_node,

				"broadcom,c45-reg-init", &len);

	if (!paddr)

		return 0;



	paddr_end = paddr + (len /= sizeof(*paddr));



	ret = 0;



	while (paddr + 3 < paddr_end) {

		u16 devid	= be32_to_cpup(paddr++);

		u16 reg		= be32_to_cpup(paddr++);

		u16 mask	= be32_to_cpup(paddr++);

		u16 val_bits	= be32_to_cpup(paddr++);

		int val;

		u32 regnum = MII_ADDR_C45 | (devid << 16) | reg;

		val = 0;

		if (mask) {

			val = phy_read(phydev, regnum);

			if (val < 0) {

				ret = val;

				goto err;

			}

			val &= mask;

		}

		val |= val_bits;



		ret = phy_write(phydev, regnum, val);

		if (ret < 0)

			goto err;

	}

err:

	return ret;

}

#else

static int bcm87xx_of_reg_init(struct phy_device *phydev)

{

	return 0;

}

#endif /* CONFIG_OF_MDIO */



static int bcm87xx_config_init(struct phy_device *phydev)

{

	phydev->supported = SUPPORTED_10000baseR_FEC;

	phydev->advertising = ADVERTISED_10000baseR_FEC;

	phydev->state = PHY_NOLINK;



	bcm87xx_of_reg_init(phydev);



	return 0;

}



static int bcm87xx_config_aneg(struct phy_device *phydev)

{

	return -EINVAL;

}



static int bcm87xx_read_status(struct phy_device *phydev)

{

	int rx_signal_detect;

	int pcs_status;

	int xgxs_lane_status;



	rx_signal_detect = phy_read(phydev, BCM87XX_PMD_RX_SIGNAL_DETECT);

	if (rx_signal_detect < 0)

		return rx_signal_detect;



	if ((rx_signal_detect & 1) == 0)

		goto no_link;



	pcs_status = phy_read(phydev, BCM87XX_10GBASER_PCS_STATUS);

	if (pcs_status < 0)

		return pcs_status;



	if ((pcs_status & 1) == 0)

		goto no_link;



	xgxs_lane_status = phy_read(phydev, BCM87XX_XGXS_LANE_STATUS);

	if (xgxs_lane_status < 0)

		return xgxs_lane_status;



	if ((xgxs_lane_status & 0x1000) == 0)

		goto no_link;



	phydev->speed = 10000;

	phydev->link = 1;

	phydev->duplex = 1;

	return 0;



no_link:

	phydev->link = 0;

	return 0;

}



static int bcm87xx_config_intr(struct phy_device *phydev)

{

	int reg, err;



	reg = phy_read(phydev, BCM87XX_LASI_CONTROL);



	if (reg < 0)

		return reg;



	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)

		reg |= 1;

	else

		reg &= ~1;



	err = phy_write(phydev, BCM87XX_LASI_CONTROL, reg);

	return err;

}



static int bcm87xx_did_interrupt(struct phy_device *phydev)

{

	int reg;



	reg = phy_read(phydev, BCM87XX_LASI_STATUS);



	if (reg < 0) {

		dev_err(&phydev->dev,

			"Error: Read of BCM87XX_LASI_STATUS failed: %d\n", reg);

		return 0;

	}

	return (reg & 1) != 0;

}



static int bcm87xx_ack_interrupt(struct phy_device *phydev)

{

	/* Reading the LASI status clears it. */

	bcm87xx_did_interrupt(phydev);

	return 0;

}



static int bcm8706_match_phy_device(struct phy_device *phydev)

{

	return phydev->c45_ids.device_ids[4] == PHY_ID_BCM8706;

}



static int bcm8727_match_phy_device(struct phy_device *phydev)

{

	return phydev->c45_ids.device_ids[4] == PHY_ID_BCM8727;

}



static struct phy_driver bcm8706_driver = {

	.phy_id		= PHY_ID_BCM8706,

	.phy_id_mask	= 0xffffffff,

	.name		= "Broadcom BCM8706",

	.flags		= PHY_HAS_INTERRUPT,

	.config_init	= bcm87xx_config_init,

	.config_aneg	= bcm87xx_config_aneg,

	.read_status	= bcm87xx_read_status,

	.ack_interrupt	= bcm87xx_ack_interrupt,

	.config_intr	= bcm87xx_config_intr,

	.did_interrupt	= bcm87xx_did_interrupt,

	.match_phy_device = bcm8706_match_phy_device,

	.driver		= { .owner = THIS_MODULE },

};



static struct phy_driver bcm8727_driver = {

	.phy_id		= PHY_ID_BCM8727,

	.phy_id_mask	= 0xffffffff,

	.name		= "Broadcom BCM8727",

	.flags		= PHY_HAS_INTERRUPT,

	.config_init	= bcm87xx_config_init,

	.config_aneg	= bcm87xx_config_aneg,

	.read_status	= bcm87xx_read_status,

	.ack_interrupt	= bcm87xx_ack_interrupt,

	.config_intr	= bcm87xx_config_intr,

	.did_interrupt	= bcm87xx_did_interrupt,

	.match_phy_device = bcm8727_match_phy_device,

	.driver		= { .owner = THIS_MODULE },

};



static int __init bcm87xx_init(void)

{

	int ret;



	ret = phy_driver_register(&bcm8706_driver);

	if (ret)

		goto err;



	ret = phy_driver_register(&bcm8727_driver);

err:

	return ret;

}

module_init(bcm87xx_init);



static void __exit bcm87xx_exit(void)

{

	phy_driver_unregister(&bcm8706_driver);

	phy_driver_unregister(&bcm8727_driver);

}

module_exit(bcm87xx_exit);