This patch adds a PHY Abstraction Layer to the Linux Kernel, enabling

ethernet drivers to remain as ignorant as is reasonable of the connected
PHY's design and operation details.

Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 195 insertions, 0 deletions

diff --git a/drivers/net/phy/davicom.c b/drivers/net/phy/davicom.c
new file mode 100644
index 000000000000..6caf499fae32
--- /dev/null
+++ b/drivers/net/phy/davicom.c
@@ -0,0 +1,195 @@
+/*
+ * drivers/net/phy/davicom.c
+ *
+ * Driver for Davicom PHYs
+ *
+ * Author: Andy Fleming
+ *
+ * Copyright (c) 2004 Freescale Semiconductor, Inc.
+ *
+ * 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/config.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/mii.h>
+#include <linux/ethtool.h>
+#include <linux/phy.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#define MII_DM9161_SCR          0x10
+#define MII_DM9161_SCR_INIT     0x0610
+
+/* DM9161 Interrupt Register */
+#define MII_DM9161_INTR 0x15
+#define MII_DM9161_INTR_PEND            0x8000
+#define MII_DM9161_INTR_DPLX_MASK       0x0800
+#define MII_DM9161_INTR_SPD_MASK        0x0400
+#define MII_DM9161_INTR_LINK_MASK       0x0200
+#define MII_DM9161_INTR_MASK            0x0100
+#define MII_DM9161_INTR_DPLX_CHANGE     0x0010
+#define MII_DM9161_INTR_SPD_CHANGE      0x0008
+#define MII_DM9161_INTR_LINK_CHANGE     0x0004
+#define MII_DM9161_INTR_INIT            0x0000
+#define MII_DM9161_INTR_STOP    \
+(MII_DM9161_INTR_DPLX_MASK | MII_DM9161_INTR_SPD_MASK \
+ | MII_DM9161_INTR_LINK_MASK | MII_DM9161_INTR_MASK)
+
+/* DM9161 10BT Configuration/Status */
+#define MII_DM9161_10BTCSR      0x12
+#define MII_DM9161_10BTCSR_INIT 0x7800
+
+MODULE_DESCRIPTION("Davicom PHY driver");
+MODULE_AUTHOR("Andy Fleming");
+MODULE_LICENSE("GPL");
+
+
+#define DM9161_DELAY 1
+static int dm9161_config_intr(struct phy_device *phydev)
+{
+        int temp;
+
+        temp = phy_read(phydev, MII_DM9161_INTR);
+
+        if (temp < 0)
+                return temp;
+
+        if(PHY_INTERRUPT_ENABLED == phydev->interrupts )
+                temp &= ~(MII_DM9161_INTR_STOP);
+        else
+                temp |= MII_DM9161_INTR_STOP;
+
+        temp = phy_write(phydev, MII_DM9161_INTR, temp);
+
+        return temp;
+}
+
+static int dm9161_config_aneg(struct phy_device *phydev)
+{
+        int err;
+
+        /* Isolate the PHY */
+        err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);
+
+        if (err < 0)
+                return err;
+
+        /* Configure the new settings */
+        err = genphy_config_aneg(phydev);
+
+        if (err < 0)
+                return err;
+
+        return 0;
+}
+
+static int dm9161_config_init(struct phy_device *phydev)
+{
+        int err;
+
+        /* Isolate the PHY */
+        err = phy_write(phydev, MII_BMCR, BMCR_ISOLATE);
+
+        if (err < 0)
+                return err;
+
+        /* Do not bypass the scrambler/descrambler */
+        err = phy_write(phydev, MII_DM9161_SCR, MII_DM9161_SCR_INIT);
+
+        if (err < 0)
+                return err;
+
+        /* Clear 10BTCSR to default */
+        err = phy_write(phydev, MII_DM9161_10BTCSR, MII_DM9161_10BTCSR_INIT);
+
+        if (err < 0)
+                return err;
+
+        /* Reconnect the PHY, and enable Autonegotiation */
+        err = phy_write(phydev, MII_BMCR, BMCR_ANENABLE);
+
+        if (err < 0)
+                return err;
+
+        return 0;
+}
+
+static int dm9161_ack_interrupt(struct phy_device *phydev)
+{
+        int err = phy_read(phydev, MII_DM9161_INTR);
+
+        return (err < 0) ? err : 0;
+}
+
+static struct phy_driver dm9161_driver = {
+        .phy_id         = 0x0181b880,
+        .name           = "Davicom DM9161E",
+        .phy_id_mask    = 0x0ffffff0,
+        .features       = PHY_BASIC_FEATURES,
+        .config_init    = dm9161_config_init,
+        .config_aneg    = dm9161_config_aneg,
+        .read_status    = genphy_read_status,
+        .driver         = { .owner = THIS_MODULE,},
+};
+
+static struct phy_driver dm9131_driver = {
+        .phy_id         = 0x00181b80,
+        .name           = "Davicom DM9131",
+        .phy_id_mask    = 0x0ffffff0,
+        .features       = PHY_BASIC_FEATURES,
+        .flags          = PHY_HAS_INTERRUPT,
+        .config_aneg    = genphy_config_aneg,
+        .read_status    = genphy_read_status,
+        .ack_interrupt  = dm9161_ack_interrupt,
+        .config_intr    = dm9161_config_intr,
+        .driver         = { .owner = THIS_MODULE,},
+};
+
+static int __init davicom_init(void)
+{
+        int ret;
+
+        ret = phy_driver_register(&dm9161_driver);
+        if (ret)
+                goto err1;
+
+        ret = phy_driver_register(&dm9131_driver);
+        if (ret)
+                goto err2;
+        return 0;
+
+ err2:  
+        phy_driver_unregister(&dm9161_driver);
+ err1:
+        return ret;
+}
+
+static void __exit davicom_exit(void)
+{
+        phy_driver_unregister(&dm9161_driver);
+        phy_driver_unregister(&dm9131_driver);
+}
+
+module_init(davicom_init);
+module_exit(davicom_exit);