1 files changed, 219 insertions, 0 deletions

diff --git a/drivers/net/gianfar_mii.c b/drivers/net/gianfar_mii.c
new file mode 100644
index 000000000000..1eca1dbca7f1
--- /dev/null
+++ b/drivers/net/gianfar_mii.c
@@ -0,0 +1,219 @@
+/* 
+ * drivers/net/gianfar_mii.c
+ *
+ * Gianfar Ethernet Driver -- MIIM bus implementation
+ * Provides Bus interface for MIIM regs
+ *
+ * Author: Andy Fleming
+ * Maintainer: Kumar Gala (kumar.gala@freescale.com)
+ *
+ * Copyright (c) 2002-2004 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 <asm/ocp.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#include "gianfar.h"
+#include "gianfar_mii.h"
+
+/* Write value to the PHY at mii_id at register regnum,
+ * on the bus, waiting until the write is done before returning.
+ * All PHY configuration is done through the TSEC1 MIIM regs */
+int gfar_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
+{
+        struct gfar_mii *regs = bus->priv;
+
+        /* Set the PHY address and the register address we want to write */
+        gfar_write(&regs->miimadd, (mii_id << 8) | regnum);
+
+        /* Write out the value we want */
+        gfar_write(&regs->miimcon, value);
+
+        /* Wait for the transaction to finish */
+        while (gfar_read(&regs->miimind) & MIIMIND_BUSY)
+                cpu_relax();
+
+        return 0;
+}
+
+/* Read the bus for PHY at addr mii_id, register regnum, and
+ * return the value.  Clears miimcom first.  All PHY
+ * configuration has to be done through the TSEC1 MIIM regs */
+int gfar_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
+{
+        struct gfar_mii *regs = bus->priv;
+        u16 value;
+
+        /* Set the PHY address and the register address we want to read */
+        gfar_write(&regs->miimadd, (mii_id << 8) | regnum);
+
+        /* Clear miimcom, and then initiate a read */
+        gfar_write(&regs->miimcom, 0);
+        gfar_write(&regs->miimcom, MII_READ_COMMAND);
+
+        /* Wait for the transaction to finish */
+        while (gfar_read(&regs->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
+                cpu_relax();
+
+        /* Grab the value of the register from miimstat */
+        value = gfar_read(&regs->miimstat);
+
+        return value;
+}
+
+
+/* Reset the MIIM registers, and wait for the bus to free */
+int gfar_mdio_reset(struct mii_bus *bus)
+{
+        struct gfar_mii *regs = bus->priv;
+        unsigned int timeout = PHY_INIT_TIMEOUT;
+
+        spin_lock_bh(&bus->mdio_lock);
+
+        /* Reset the management interface */
+        gfar_write(&regs->miimcfg, MIIMCFG_RESET);
+
+        /* Setup the MII Mgmt clock speed */
+        gfar_write(&regs->miimcfg, MIIMCFG_INIT_VALUE);
+
+        /* Wait until the bus is free */
+        while ((gfar_read(&regs->miimind) & MIIMIND_BUSY) &&
+                        timeout--)
+                cpu_relax();
+
+        spin_unlock_bh(&bus->mdio_lock);
+
+        if(timeout <= 0) {
+                printk(KERN_ERR "%s: The MII Bus is stuck!\n",
+                                bus->name);
+                return -EBUSY;
+        }
+
+        return 0;
+}
+
+
+int gfar_mdio_probe(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct gianfar_mdio_data *pdata;
+        struct gfar_mii *regs;
+        struct mii_bus *new_bus;
+        int err = 0;
+
+        if (NULL == dev)
+                return -EINVAL;
+
+        new_bus = kmalloc(sizeof(struct mii_bus), GFP_KERNEL);
+
+        if (NULL == new_bus)
+                return -ENOMEM;
+
+        new_bus->name = "Gianfar MII Bus",
+        new_bus->read = &gfar_mdio_read,
+        new_bus->write = &gfar_mdio_write,
+        new_bus->reset = &gfar_mdio_reset,
+        new_bus->id = pdev->id;
+
+        pdata = (struct gianfar_mdio_data *)pdev->dev.platform_data;
+
+        if (NULL == pdata) {
+                printk(KERN_ERR "gfar mdio %d: Missing platform data!\n", pdev->id);
+                return -ENODEV;
+        }
+
+        /* Set the PHY base address */
+        regs = (struct gfar_mii *) ioremap(pdata->paddr, 
+                        sizeof (struct gfar_mii));
+
+        if (NULL == regs) {
+                err = -ENOMEM;
+                goto reg_map_fail;
+        }
+
+        new_bus->priv = regs;
+
+        new_bus->irq = pdata->irq;
+
+        new_bus->dev = dev;
+        dev_set_drvdata(dev, new_bus);
+
+        err = mdiobus_register(new_bus);
+
+        if (0 != err) {
+                printk (KERN_ERR "%s: Cannot register as MDIO bus\n", 
+                                new_bus->name);
+                goto bus_register_fail;
+        }
+
+        return 0;
+
+bus_register_fail:
+        iounmap((void *) regs);
+reg_map_fail:
+        kfree(new_bus);
+
+        return err;
+}
+
+
+int gfar_mdio_remove(struct device *dev)
+{
+        struct mii_bus *bus = dev_get_drvdata(dev);
+
+        mdiobus_unregister(bus);
+
+        dev_set_drvdata(dev, NULL);
+
+        iounmap((void *) (&bus->priv));
+        bus->priv = NULL;
+        kfree(bus);
+
+        return 0;
+}
+
+static struct device_driver gianfar_mdio_driver = {
+        .name = "fsl-gianfar_mdio",
+        .bus = &platform_bus_type,
+        .probe = gfar_mdio_probe,
+        .remove = gfar_mdio_remove,
+};
+
+int __init gfar_mdio_init(void)
+{
+        return driver_register(&gianfar_mdio_driver);
+}
+
+void __exit gfar_mdio_exit(void)
+{
+        driver_unregister(&gianfar_mdio_driver);
+}