[PATCH] 2.6.18: sb1250-mac: Broadcom PHY support

This patch adds support for interrupt-driven operation of the Broadcom
Gigabit Ethernet PHYs.  I have included device IDs for the parts used on
Broadcom SiByte evaluation boards; more can be added as a need arises.
They are apparently generally software-compatible with one another.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>

patch-mips-2.6.18-20060920-broadcom-phy-15
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/phy/Kconfig

@@ -56,6 +56,12 @@ config SMSC_PHY
 	---help---
 	  Currently supports the LAN83C185 PHY
 
+config BROADCOM_PHY
+	tristate "Drivers for Broadcom PHYs"
+	depends on PHYLIB
+	---help---
+	  Currently supports the BCM5411, BCM5421 and BCM5461 PHYs.
+
 config FIXED_PHY
 	tristate "Drivers for PHY emulation on fixed speed/link"
 	depends on PHYLIB

drivers/net/phy/Makefile

@@ -10,4 +10,5 @@ obj-$(CONFIG_LXT_PHY)		+= lxt.o
 obj-$(CONFIG_QSEMI_PHY)		+= qsemi.o
 obj-$(CONFIG_SMSC_PHY)		+= smsc.o
 obj-$(CONFIG_VITESSE_PHY)	+= vitesse.o
+obj-$(CONFIG_BROADCOM_PHY)	+= broadcom.o
 obj-$(CONFIG_FIXED_PHY)		+= fixed.o

drivers/net/phy/broadcom.c

@@ -0,0 +1,175 @@
+/*
+ *	drivers/net/phy/broadcom.c
+ *
+ *	Broadcom BCM5411, BCM5421 and BCM5461 Gigabit Ethernet
+ *	transceivers.
+ *
+ *	Copyright (c) 2006  Maciej W. Rozycki
+ *
+ *	Inspired by code written by Amy Fong.
+ *
+ *	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/module.h>
+#include <linux/phy.h>
+
+#define MII_BCM54XX_ECR		0x10	/* BCM54xx extended control register */
+#define MII_BCM54XX_ECR_IM	0x1000	/* Interrupt mask */
+#define MII_BCM54XX_ECR_IF	0x0800	/* Interrupt force */
+
+#define MII_BCM54XX_ESR		0x11	/* BCM54xx extended status register */
+#define MII_BCM54XX_ESR_IS	0x1000	/* Interrupt status */
+
+#define MII_BCM54XX_ISR		0x1a	/* BCM54xx interrupt status register */
+#define MII_BCM54XX_IMR		0x1b	/* BCM54xx interrupt mask register */
+#define MII_BCM54XX_INT_CRCERR	0x0001	/* CRC error */
+#define MII_BCM54XX_INT_LINK	0x0002	/* Link status changed */
+#define MII_BCM54XX_INT_SPEED	0x0004	/* Link speed change */
+#define MII_BCM54XX_INT_DUPLEX	0x0008	/* Duplex mode changed */
+#define MII_BCM54XX_INT_LRS	0x0010	/* Local receiver status changed */
+#define MII_BCM54XX_INT_RRS	0x0020	/* Remote receiver status changed */
+#define MII_BCM54XX_INT_SSERR	0x0040	/* Scrambler synchronization error */
+#define MII_BCM54XX_INT_UHCD	0x0080	/* Unsupported HCD negotiated */
+#define MII_BCM54XX_INT_NHCD	0x0100	/* No HCD */
+#define MII_BCM54XX_INT_NHCDL	0x0200	/* No HCD link */
+#define MII_BCM54XX_INT_ANPR	0x0400	/* Auto-negotiation page received */
+#define MII_BCM54XX_INT_LC	0x0800	/* All counters below 128 */
+#define MII_BCM54XX_INT_HC	0x1000	/* Counter above 32768 */
+#define MII_BCM54XX_INT_MDIX	0x2000	/* MDIX status change */
+#define MII_BCM54XX_INT_PSERR	0x4000	/* Pair swap error */
+
+MODULE_DESCRIPTION("Broadcom PHY driver");
+MODULE_AUTHOR("Maciej W. Rozycki");
+MODULE_LICENSE("GPL");
+
+static int bcm54xx_config_init(struct phy_device *phydev)
+{
+	int reg, err;
+
+	reg = phy_read(phydev, MII_BCM54XX_ECR);
+	if (reg < 0)
+		return reg;
+
+	/* Mask interrupts globally.  */
+	reg |= MII_BCM54XX_ECR_IM;
+	err = phy_write(phydev, MII_BCM54XX_ECR, reg);
+	if (err < 0)
+		return err;
+
+	/* Unmask events we are interested in.  */
+	reg = ~(MII_BCM54XX_INT_DUPLEX |
+		MII_BCM54XX_INT_SPEED |
+		MII_BCM54XX_INT_LINK);
+	err = phy_write(phydev, MII_BCM54XX_IMR, reg);
+	if (err < 0)
+		return err;
+	return 0;
+}
+
+static int bcm54xx_ack_interrupt(struct phy_device *phydev)
+{
+	int reg;
+
+	/* Clear pending interrupts.  */
+	reg = phy_read(phydev, MII_BCM54XX_ISR);
+	if (reg < 0)
+		return reg;
+
+	return 0;
+}
+
+static int bcm54xx_config_intr(struct phy_device *phydev)
+{
+	int reg, err;
+
+	reg = phy_read(phydev, MII_BCM54XX_ECR);
+	if (reg < 0)
+		return reg;
+
+	if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
+		reg &= ~MII_BCM54XX_ECR_IM;
+	else
+		reg |= MII_BCM54XX_ECR_IM;
+
+	err = phy_write(phydev, MII_BCM54XX_ECR, reg);
+	return err;
+}
+
+static struct phy_driver bcm5411_driver = {
+	.phy_id		= 0x00206070,
+	.phy_id_mask	= 0xfffffff0,
+	.name		= "Broadcom BCM5411",
+	.features	= PHY_GBIT_FEATURES,
+	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
+	.config_init	= bcm54xx_config_init,
+	.config_aneg	= genphy_config_aneg,
+	.read_status	= genphy_read_status,
+	.ack_interrupt	= bcm54xx_ack_interrupt,
+	.config_intr	= bcm54xx_config_intr,
+	.driver 	= { .owner = THIS_MODULE },
+};
+
+static struct phy_driver bcm5421_driver = {
+	.phy_id		= 0x002060e0,
+	.phy_id_mask	= 0xfffffff0,
+	.name		= "Broadcom BCM5421",
+	.features	= PHY_GBIT_FEATURES,
+	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
+	.config_init	= bcm54xx_config_init,
+	.config_aneg	= genphy_config_aneg,
+	.read_status	= genphy_read_status,
+	.ack_interrupt	= bcm54xx_ack_interrupt,
+	.config_intr	= bcm54xx_config_intr,
+	.driver 	= { .owner = THIS_MODULE },
+};
+
+static struct phy_driver bcm5461_driver = {
+	.phy_id		= 0x002060c0,
+	.phy_id_mask	= 0xfffffff0,
+	.name		= "Broadcom BCM5461",
+	.features	= PHY_GBIT_FEATURES,
+	.flags		= PHY_HAS_MAGICANEG | PHY_HAS_INTERRUPT,
+	.config_init	= bcm54xx_config_init,
+	.config_aneg	= genphy_config_aneg,
+	.read_status	= genphy_read_status,
+	.ack_interrupt	= bcm54xx_ack_interrupt,
+	.config_intr	= bcm54xx_config_intr,
+	.driver 	= { .owner = THIS_MODULE },
+};
+
+static int __init broadcom_init(void)
+{
+	int ret;
+
+	ret = phy_driver_register(&bcm5411_driver);
+	if (ret)
+		goto out_5411;
+	ret = phy_driver_register(&bcm5421_driver);
+	if (ret)
+		goto out_5421;
+	ret = phy_driver_register(&bcm5461_driver);
+	if (ret)
+		goto out_5461;
+	return ret;
+
+out_5461:
+	phy_driver_unregister(&bcm5421_driver);
+out_5421:
+	phy_driver_unregister(&bcm5411_driver);
+out_5411:
+	return ret;
+}
+
+static void __exit broadcom_exit(void)
+{
+	phy_driver_unregister(&bcm5461_driver);
+	phy_driver_unregister(&bcm5421_driver);
+	phy_driver_unregister(&bcm5411_driver);
+}
+
+module_init(broadcom_init);
+module_exit(broadcom_exit);