1 files changed, 358 insertions, 0 deletions

diff --git a/drivers/net/phy/fixed.c b/drivers/net/phy/fixed.c
new file mode 100644
index 000000000000..341036df4710
--- /dev/null
+++ b/drivers/net/phy/fixed.c
@@ -0,0 +1,358 @@
+/*
+ * drivers/net/phy/fixed.c
+ *
+ * Driver for fixed PHYs, when transceiver is able to operate in one fixed mode.
+ *
+ * Author: Vitaly Bordug
+ *
+ * Copyright (c) 2006 MontaVista Software, 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/mii.h>
+#include <linux/ethtool.h>
+#include <linux/phy.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+
+#define MII_REGS_NUM    7
+
+/*
+    The idea is to emulate normal phy behavior by responding with
+    pre-defined values to mii BMCR read, so that read_status hook could
+    take all the needed info.
+*/
+
+struct fixed_phy_status {
+        u8      link;
+        u16     speed;
+        u8      duplex;
+};
+
+/*-----------------------------------------------------------------------------
+ *  Private information hoder for mii_bus
+ *-----------------------------------------------------------------------------*/
+struct fixed_info {
+        u16 *regs;
+        u8 regs_num;
+        struct fixed_phy_status phy_status;
+        struct phy_device *phydev; /* pointer to the container */
+        /* link & speed cb */
+        int(*link_update)(struct net_device*, struct fixed_phy_status*);
+
+};
+
+/*-----------------------------------------------------------------------------
+ *  If something weird is required to be done with link/speed,
+ * network driver is able to assign a function to implement this.
+ * May be useful for PHY's that need to be software-driven.
+ *-----------------------------------------------------------------------------*/
+int fixed_mdio_set_link_update(struct phy_device* phydev,
+                int(*link_update)(struct net_device*, struct fixed_phy_status*))
+{
+        struct fixed_info *fixed;
+
+        if(link_update == NULL)
+                return -EINVAL;
+
+        if(phydev) {
+                if(phydev->bus) {
+                        fixed = phydev->bus->priv;
+                        fixed->link_update = link_update;
+                        return 0;
+                }
+        }
+        return -EINVAL;
+}
+EXPORT_SYMBOL(fixed_mdio_set_link_update);
+
+/*-----------------------------------------------------------------------------
+ *  This is used for updating internal mii regs from the status
+ *-----------------------------------------------------------------------------*/
+static int fixed_mdio_update_regs(struct fixed_info *fixed)
+{
+        u16 *regs = fixed->regs;
+        u16 bmsr = 0;
+        u16 bmcr = 0;
+
+        if(!regs) {
+                printk(KERN_ERR "%s: regs not set up", __FUNCTION__);
+                return -EINVAL;
+        }
+
+        if(fixed->phy_status.link)
+                bmsr |= BMSR_LSTATUS;
+
+        if(fixed->phy_status.duplex) {
+                bmcr |= BMCR_FULLDPLX;
+
+                switch ( fixed->phy_status.speed ) {
+                case 100:
+                        bmsr |= BMSR_100FULL;
+                        bmcr |= BMCR_SPEED100;
+                break;
+
+                case 10:
+                        bmsr |= BMSR_10FULL;
+                break;
+                }
+        } else {
+                switch ( fixed->phy_status.speed ) {
+                case 100:
+                        bmsr |= BMSR_100HALF;
+                        bmcr |= BMCR_SPEED100;
+                break;
+
+                case 10:
+                        bmsr |= BMSR_100HALF;
+                break;
+                }
+        }
+
+        regs[MII_BMCR] =  bmcr;
+        regs[MII_BMSR] =  bmsr | 0x800; /*we are always capable of 10 hdx*/
+
+        return 0;
+}
+
+static int fixed_mii_read(struct mii_bus *bus, int phy_id, int location)
+{
+        struct fixed_info *fixed = bus->priv;
+
+        /* if user has registered link update callback, use it */
+        if(fixed->phydev)
+                if(fixed->phydev->attached_dev) {
+                        if(fixed->link_update) {
+                                fixed->link_update(fixed->phydev->attached_dev,
+                                                &fixed->phy_status);
+                                fixed_mdio_update_regs(fixed);
+                        }
+        }
+
+        if ((unsigned int)location >= fixed->regs_num)
+                return -1;
+        return fixed->regs[location];
+}
+
+static int fixed_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
+{
+        /* do nothing for now*/
+        return 0;
+}
+
+static int fixed_mii_reset(struct mii_bus *bus)
+{
+        /*nothing here - no way/need to reset it*/
+        return 0;
+}
+
+static int fixed_config_aneg(struct phy_device *phydev)
+{
+        /* :TODO:03/13/2006 09:45:37 PM::
+         The full autoneg funcionality can be emulated,
+         but no need to have anything here for now
+         */
+        return 0;
+}
+
+/*-----------------------------------------------------------------------------
+ * the manual bind will do the magic - with phy_id_mask == 0
+ * match will never return true...
+ *-----------------------------------------------------------------------------*/
+static struct phy_driver fixed_mdio_driver = {
+        .name           = "Fixed PHY",
+        .features       = PHY_BASIC_FEATURES,
+        .config_aneg    = fixed_config_aneg,
+        .read_status    = genphy_read_status,
+        .driver         = { .owner = THIS_MODULE,},
+};
+
+/*-----------------------------------------------------------------------------
+ *  This func is used to create all the necessary stuff, bind
+ * the fixed phy driver and register all it on the mdio_bus_type.
+ * speed is either 10 or 100, duplex is boolean.
+ * number is used to create multiple fixed PHYs, so that several devices can
+ * utilize them simultaneously.
+ *-----------------------------------------------------------------------------*/
+static int fixed_mdio_register_device(int number, int speed, int duplex)
+{
+        struct mii_bus *new_bus;
+        struct fixed_info *fixed;
+        struct phy_device *phydev;
+        int err = 0;
+
+        struct device* dev = kzalloc(sizeof(struct device), GFP_KERNEL);
+
+        if (NULL == dev)
+                return -ENOMEM;
+
+        new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
+
+        if (NULL == new_bus) {
+                kfree(dev);
+                return -ENOMEM;
+        }
+        fixed = kzalloc(sizeof(struct fixed_info), GFP_KERNEL);
+
+        if (NULL == fixed) {
+                kfree(dev);
+                kfree(new_bus);
+                return -ENOMEM;
+        }
+
+        fixed->regs = kzalloc(MII_REGS_NUM*sizeof(int), GFP_KERNEL);
+        fixed->regs_num = MII_REGS_NUM;
+        fixed->phy_status.speed = speed;
+        fixed->phy_status.duplex = duplex;
+        fixed->phy_status.link = 1;
+
+        new_bus->name = "Fixed MII Bus",
+        new_bus->read = &fixed_mii_read,
+        new_bus->write = &fixed_mii_write,
+        new_bus->reset = &fixed_mii_reset,
+
+        /*set up workspace*/
+        fixed_mdio_update_regs(fixed);
+        new_bus->priv = fixed;
+
+        new_bus->dev = dev;
+        dev_set_drvdata(dev, new_bus);
+
+        /* create phy_device and register it on the mdio bus */
+        phydev = phy_device_create(new_bus, 0, 0);
+
+        /*
+         Put the phydev pointer into the fixed pack so that bus read/write code could
+         be able to access for instance attached netdev. Well it doesn't have to do
+         so, only in case of utilizing user-specified link-update...
+         */
+        fixed->phydev = phydev;
+
+        if(NULL == phydev) {
+                err = -ENOMEM;
+                goto device_create_fail;
+        }
+
+        phydev->irq = -1;
+        phydev->dev.bus = &mdio_bus_type;
+
+        if(number)
+                snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
+                                "fixed_%d@%d:%d", number, speed, duplex);
+        else
+                snprintf(phydev->dev.bus_id, BUS_ID_SIZE,
+                                "fixed@%d:%d", speed, duplex);
+        phydev->bus = new_bus;
+
+        err = device_register(&phydev->dev);
+        if(err) {
+                printk(KERN_ERR "Phy %s failed to register\n",
+                                phydev->dev.bus_id);
+                goto bus_register_fail;
+        }
+
+        /*
+           the mdio bus has phy_id match... In order not to do it
+           artificially, we are binding the driver here by hand;
+           it will be the same for all the fixed phys anyway.
+         */
+        down_write(&phydev->dev.bus->subsys.rwsem);
+
+        phydev->dev.driver = &fixed_mdio_driver.driver;
+
+        err = phydev->dev.driver->probe(&phydev->dev);
+        if(err < 0) {
+                printk(KERN_ERR "Phy %s: problems with fixed driver\n",phydev->dev.bus_id);
+                up_write(&phydev->dev.bus->subsys.rwsem);
+                goto probe_fail;
+        }
+
+        device_bind_driver(&phydev->dev);
+        up_write(&phydev->dev.bus->subsys.rwsem);
+
+        return 0;
+
+probe_fail:
+        device_unregister(&phydev->dev);
+bus_register_fail:
+        kfree(phydev);
+device_create_fail:
+        kfree(dev);
+        kfree(new_bus);
+        kfree(fixed);
+
+        return err;
+}
+
+
+MODULE_DESCRIPTION("Fixed PHY device & driver for PAL");
+MODULE_AUTHOR("Vitaly Bordug");
+MODULE_LICENSE("GPL");
+
+static int __init fixed_init(void)
+{
+        int ret;
+        int duplex = 0;
+
+        /* register on the bus... Not expected to be matched with anything there... */
+        phy_driver_register(&fixed_mdio_driver);
+
+        /* So let the fun begin...
+           We will create several mdio devices here, and will bound the upper
+           driver to them.
+
+           Then the external software can lookup the phy bus by searching
+           fixed@speed:duplex, e.g. fixed@100:1, to be connected to the
+           virtual 100M Fdx phy.
+
+           In case several virtual PHYs required, the bus_id will be in form
+           fixed_<num>@<speed>:<duplex>, which make it able even to define
+           driver-specific link control callback, if for instance PHY is completely
+           SW-driven.
+
+        */
+
+#ifdef CONFIG_FIXED_MII_DUPLEX
+        duplex = 1;
+#endif
+
+#ifdef CONFIG_FIXED_MII_100_FDX
+        fixed_mdio_register_device(0, 100, 1);
+#endif
+
+#ifdef CONFIX_FIXED_MII_10_FDX
+        fixed_mdio_register_device(0, 10, 1);
+#endif
+        return 0;
+}
+
+static void __exit fixed_exit(void)
+{
+        phy_driver_unregister(&fixed_mdio_driver);
+        /* :WARNING:02/18/2006 04:32:40 AM:: Cleanup all the created stuff */
+}
+
+module_init(fixed_init);
+module_exit(fixed_exit);