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, 143 insertions, 0 deletions

diff --git a/drivers/net/phy/qsemi.c b/drivers/net/phy/qsemi.c
new file mode 100644
index 000000000000..d461ba457631
--- /dev/null
+++ b/drivers/net/phy/qsemi.c
@@ -0,0 +1,143 @@
+/*
+ * drivers/net/phy/qsemi.c
+ *
+ * Driver for Quality Semiconductor 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>
+
+/* ------------------------------------------------------------------------- */
+/* The Quality Semiconductor QS6612 is used on the RPX CLLF                  */
+
+/* register definitions */
+
+#define MII_QS6612_MCR          17  /* Mode Control Register      */
+#define MII_QS6612_FTR          27  /* Factory Test Register      */
+#define MII_QS6612_MCO          28  /* Misc. Control Register     */
+#define MII_QS6612_ISR          29  /* Interrupt Source Register  */
+#define MII_QS6612_IMR          30  /* Interrupt Mask Register    */
+#define MII_QS6612_IMR_INIT     0x003a
+#define MII_QS6612_PCR          31  /* 100BaseTx PHY Control Reg. */
+
+#define QS6612_PCR_AN_COMPLETE  0x1000
+#define QS6612_PCR_RLBEN        0x0200
+#define QS6612_PCR_DCREN        0x0100
+#define QS6612_PCR_4B5BEN       0x0040
+#define QS6612_PCR_TX_ISOLATE   0x0020
+#define QS6612_PCR_MLT3_DIS     0x0002
+#define QS6612_PCR_SCRM_DESCRM  0x0001
+
+MODULE_DESCRIPTION("Quality Semiconductor PHY driver");
+MODULE_AUTHOR("Andy Fleming");
+MODULE_LICENSE("GPL");
+
+/* Returns 0, unless there's a write error */
+static int qs6612_config_init(struct phy_device *phydev)
+{
+        /* The PHY powers up isolated on the RPX,
+         * so send a command to allow operation.
+         * XXX - My docs indicate this should be 0x0940
+         * ...or something.  The current value sets three
+         * reserved bits, bit 11, which specifies it should be
+         * set to one, bit 10, which specifies it should be set
+         * to 0, and bit 7, which doesn't specify.  However, my
+         * docs are preliminary, and I will leave it like this
+         * until someone more knowledgable corrects me or it.
+         * -- Andy Fleming
+         */
+        return phy_write(phydev, MII_QS6612_PCR, 0x0dc0);
+}
+
+static int qs6612_ack_interrupt(struct phy_device *phydev)
+{
+        int err;
+
+        err = phy_read(phydev, MII_QS6612_ISR);
+
+        if (err < 0)
+                return err;
+
+        err = phy_read(phydev, MII_BMSR);
+
+        if (err < 0)
+                return err;
+
+        err = phy_read(phydev, MII_EXPANSION);
+
+        if (err < 0)
+                return err;
+
+        return 0;
+}
+
+static int qs6612_config_intr(struct phy_device *phydev)
+{
+        int err;
+        if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
+                err = phy_write(phydev, MII_QS6612_IMR,
+                                MII_QS6612_IMR_INIT);
+        else
+                err = phy_write(phydev, MII_QS6612_IMR, 0);
+
+        return err;
+
+}
+
+static struct phy_driver qs6612_driver = {
+        .phy_id         = 0x00181440,
+        .name           = "QS6612",
+        .phy_id_mask    = 0xfffffff0,
+        .features       = PHY_BASIC_FEATURES,
+        .flags          = PHY_HAS_INTERRUPT,
+        .config_init    = qs6612_config_init,
+        .config_aneg    = genphy_config_aneg,
+        .read_status    = genphy_read_status,
+        .ack_interrupt  = qs6612_ack_interrupt,
+        .config_intr    = qs6612_config_intr,
+        .driver         = { .owner = THIS_MODULE,},
+};
+
+static int __init qs6612_init(void)
+{
+        return phy_driver_register(&qs6612_driver);
+}
+
+static void __exit qs6612_exit(void)
+{
+        phy_driver_unregister(&qs6612_driver);
+}
+
+module_init(qs6612_init);
+module_exit(qs6612_exit);