mii-fec.c

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/*
 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
 *
 * Copyright (c) 2003 Intracom S.A.
 *  by Pantelis Antoniou <[email protected]>
 *
 * 2005 (c) MontaVista Software, Inc.
 * Vitaly Bordug <[email protected]>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.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/mii.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>
#include <linux/platform_device.h>
#include <linux/of_platform.h>

#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/mpc5xxx.h>

#include "fs_enet.h"
#include "fec.h"

/* Make MII read/write commands for the FEC.
*/
#define mk_mii_read(REG)    (0x60020000 | ((REG & 0x1f) << 18))
#define mk_mii_write(REG, VAL)  (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
#define mk_mii_end      0

#define FEC_MII_LOOPS   10000

static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
{
    struct fec_info* fec = bus->priv;
    struct fec __iomem *fecp = fec->fecp;
    int i, ret = -1;

    BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);

    /* Add PHY address to register command.  */
    out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));

    for (i = 0; i < FEC_MII_LOOPS; i++)
        if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
            break;

    if (i < FEC_MII_LOOPS) {
        out_be32(&fecp->fec_ievent, FEC_ENET_MII);
        ret = in_be32(&fecp->fec_mii_data) & 0xffff;
    }

    return ret;
}

static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
{
    struct fec_info* fec = bus->priv;
    struct fec __iomem *fecp = fec->fecp;
    int i;

    /* this must never happen */
    BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);

    /* Add PHY address to register command.  */
    out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));

    for (i = 0; i < FEC_MII_LOOPS; i++)
        if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
            break;

    if (i < FEC_MII_LOOPS)
        out_be32(&fecp->fec_ievent, FEC_ENET_MII);

    return 0;

}

static int fs_enet_fec_mii_reset(struct mii_bus *bus)
{
    /* nothing here - for now */
    return 0;
}

static struct of_device_id fs_enet_mdio_fec_match[];
static int __devinit fs_enet_mdio_probe(struct platform_device *ofdev)
{
    const struct of_device_id *match;
    struct resource res;
    struct mii_bus *new_bus;
    struct fec_info *fec;
    int (*get_bus_freq)(struct device_node *);
    int ret = -ENOMEM, clock, speed;

    match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev);
    if (!match)
        return -EINVAL;
    get_bus_freq = match->data;

    new_bus = mdiobus_alloc();
    if (!new_bus)
        goto out;

    fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
    if (!fec)
        goto out_mii;

    new_bus->priv = fec;
    new_bus->name = "FEC MII Bus";
    new_bus->read = &fs_enet_fec_mii_read;
    new_bus->write = &fs_enet_fec_mii_write;
    new_bus->reset = &fs_enet_fec_mii_reset;

    ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
    if (ret)
        goto out_res;

    snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);

    fec->fecp = ioremap(res.start, resource_size(&res));
    if (!fec->fecp) {
        ret = -ENOMEM;
        goto out_fec;
    }

    if (get_bus_freq) {
        clock = get_bus_freq(ofdev->dev.of_node);
        if (!clock) {
            /* Use maximum divider if clock is unknown */
            dev_warn(&ofdev->dev, "could not determine IPS clock\n");
            clock = 0x3F * 5000000;
        }
    } else
        clock = ppc_proc_freq;

    /*
     * Scale for a MII clock <= 2.5 MHz
     * Note that only 6 bits (25:30) are available for MII speed.
     */
    speed = (clock + 4999999) / 5000000;
    if (speed > 0x3F) {
        speed = 0x3F;
        dev_err(&ofdev->dev,
            "MII clock (%d Hz) exceeds max (2.5 MHz)\n",
            clock / speed);
    }

    fec->mii_speed = speed << 1;

    setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
    setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
                                      FEC_ECNTRL_ETHER_EN);
    out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
    clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed);

    new_bus->phy_mask = ~0;
    new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
    if (!new_bus->irq) {
        ret = -ENOMEM;
        goto out_unmap_regs;
    }

    new_bus->parent = &ofdev->dev;
    dev_set_drvdata(&ofdev->dev, new_bus);

    ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
    if (ret)
        goto out_free_irqs;

    return 0;

out_free_irqs:
    dev_set_drvdata(&ofdev->dev, NULL);
    kfree(new_bus->irq);
out_unmap_regs:
    iounmap(fec->fecp);
out_res:
out_fec:
    kfree(fec);
out_mii:
    mdiobus_free(new_bus);
out:
    return ret;
}

static int fs_enet_mdio_remove(struct platform_device *ofdev)
{
    struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
    struct fec_info *fec = bus->priv;

    mdiobus_unregister(bus);
    dev_set_drvdata(&ofdev->dev, NULL);
    kfree(bus->irq);
    iounmap(fec->fecp);
    kfree(fec);
    mdiobus_free(bus);

    return 0;
}

static struct of_device_id fs_enet_mdio_fec_match[] = {
    {
        .compatible = "fsl,pq1-fec-mdio",
    },
#if defined(CONFIG_PPC_MPC512x)
    {
        .compatible = "fsl,mpc5121-fec-mdio",
        .data = mpc5xxx_get_bus_frequency,
    },
#endif
    {},
};
MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match);

static struct platform_driver fs_enet_fec_mdio_driver = {
    .driver = {
        .name = "fsl-fec-mdio",
        .owner = THIS_MODULE,
        .of_match_table = fs_enet_mdio_fec_match,
    },
    .probe = fs_enet_mdio_probe,
    .remove = fs_enet_mdio_remove,
};

module_platform_driver(fs_enet_fec_mdio_driver);