drivers/net/fec_mpc52xx_phy.c

   1 /*
   2  * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
   3  *
   4  * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
   5  * Copyright (C) 2008  Wolfram Sang, Pengutronix
   6  *
   7  * This file is licensed under the terms of the GNU General Public License
   8  * version 2. This program is licensed "as is" without any warranty of any
   9  * kind, whether express or implied.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/phy.h>
  16 #include <linux/of_platform.h>
  17 #include <linux/slab.h>
  18 #include <linux/of_mdio.h>
  19 #include <asm/io.h>
  20 #include <asm/mpc52xx.h>
  21 #include "fec_mpc52xx.h"
  22
  23 struct mpc52xx_fec_mdio_priv {
  24         struct mpc52xx_fec __iomem *regs;
  25         int mdio_irqs[PHY_MAX_ADDR];
  26 };
  27
  28 static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
  29                 int reg, u32 value)
  30 {
  31         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
  32         struct mpc52xx_fec __iomem *fec = priv->regs;
  33         int tries = 3;
  34
  35         value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
  36         value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
  37
  38         out_be32(&fec->ievent, FEC_IEVENT_MII);
  39         out_be32(&fec->mii_data, value);
  40
  41         /* wait for it to finish, this takes about 23 us on lite5200b */
  42         while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
  43                 msleep(1);
  44
  45         if (!tries)
  46                 return -ETIMEDOUT;
  47
  48         return value & FEC_MII_DATA_OP_RD ?
  49                 in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0;
  50 }
  51
  52 static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
  53 {
  54         return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
  55 }
  56
  57 static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
  58                 u16 data)
  59 {
  60         return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
  61                 data | FEC_MII_WRITE_FRAME);
  62 }
  63
  64 static int mpc52xx_fec_mdio_probe(struct platform_device *of,
  65                 const struct of_device_id *match)
  66 {
  67         struct device *dev = &of->dev;
  68         struct device_node *np = of->dev.of_node;
  69         struct mii_bus *bus;
  70         struct mpc52xx_fec_mdio_priv *priv;
  71         struct resource res;
  72         int err;
  73
  74         bus = mdiobus_alloc();
  75         if (bus == NULL)
  76                 return -ENOMEM;
  77         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  78         if (priv == NULL) {
  79                 err = -ENOMEM;
  80                 goto out_free;
  81         }
  82
  83         bus->name = "mpc52xx MII bus";
  84         bus->read = mpc52xx_fec_mdio_read;
  85         bus->write = mpc52xx_fec_mdio_write;
  86
  87         /* setup irqs */
  88         bus->irq = priv->mdio_irqs;
  89
  90         /* setup registers */
  91         err = of_address_to_resource(np, 0, &res);
  92         if (err)
  93                 goto out_free;
  94         priv->regs = ioremap(res.start, resource_size(&res));
  95         if (priv->regs == NULL) {
  96                 err = -ENOMEM;
  97                 goto out_free;
  98         }
  99
 100         snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 101         bus->priv = priv;
 102
 103         bus->parent = dev;
 104         dev_set_drvdata(dev, bus);
 105
 106         /* set MII speed */
 107         out_be32(&priv->regs->mii_speed,
 108                 ((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1);
 109
 110         err = of_mdiobus_register(bus, np);
 111         if (err)
 112                 goto out_unmap;
 113
 114         return 0;
 115
 116  out_unmap:
 117         iounmap(priv->regs);
 118  out_free:
 119         kfree(priv);
 120         mdiobus_free(bus);
 121
 122         return err;
 123 }
 124
 125 static int mpc52xx_fec_mdio_remove(struct platform_device *of)
 126 {
 127         struct device *dev = &of->dev;
 128         struct mii_bus *bus = dev_get_drvdata(dev);
 129         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
 130
 131         mdiobus_unregister(bus);
 132         dev_set_drvdata(dev, NULL);
 133         iounmap(priv->regs);
 134         kfree(priv);
 135         mdiobus_free(bus);
 136
 137         return 0;
 138 }
 139
 140 static struct of_device_id mpc52xx_fec_mdio_match[] = {
 141         { .compatible = "fsl,mpc5200b-mdio", },
 142         { .compatible = "fsl,mpc5200-mdio", },
 143         { .compatible = "mpc5200b-fec-phy", },
 144         {}
 145 };
 146 MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
 147
 148 struct of_platform_driver mpc52xx_fec_mdio_driver = {
 149         .driver = {
 150                 .name = "mpc5200b-fec-phy",
 151                 .owner = THIS_MODULE,
 152                 .of_match_table = mpc52xx_fec_mdio_match,
 153         },
 154         .probe = mpc52xx_fec_mdio_probe,
 155         .remove = mpc52xx_fec_mdio_remove,
 156 };
 157
 158 /* let fec driver call it, since this has to be registered before it */
 159 EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
 160
 161 MODULE_LICENSE("Dual BSD/GPL");