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/of_mdio.h>
  18 #include <asm/io.h>
  19 #include <asm/mpc52xx.h>
  20 #include "fec_mpc52xx.h"
  21
  22 struct mpc52xx_fec_mdio_priv {
  23         struct mpc52xx_fec __iomem *regs;
  24         int mdio_irqs[PHY_MAX_ADDR];
  25 };
  26
  27 static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
  28                 int reg, u32 value)
  29 {
  30         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
  31         struct mpc52xx_fec __iomem *fec;
  32         int tries = 3;
  33
  34         value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
  35         value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
  36
  37         fec = priv->regs;
  38         out_be32(&fec->ievent, FEC_IEVENT_MII);
  39         out_be32(&priv->regs->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(&priv->regs->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 of_device *of,
  65                 const struct of_device_id *match)
  66 {
  67         struct device *dev = &of->dev;
  68         struct device_node *np = of->node;
  69         struct mii_bus *bus;
  70         struct mpc52xx_fec_mdio_priv *priv;
  71         struct resource res = {};
  72         int err;
  73         int i;
  74
  75         bus = mdiobus_alloc();
  76         if (bus == NULL)
  77                 return -ENOMEM;
  78         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  79         if (priv == NULL) {
  80                 err = -ENOMEM;
  81                 goto out_free;
  82         }
  83
  84         bus->name = "mpc52xx MII bus";
  85         bus->read = mpc52xx_fec_mdio_read;
  86         bus->write = mpc52xx_fec_mdio_write;
  87
  88         /* setup irqs */
  89         bus->irq = priv->mdio_irqs;
  90
  91         /* setup registers */
  92         err = of_address_to_resource(np, 0, &res);
  93         if (err)
  94                 goto out_free;
  95         priv->regs = ioremap(res.start, res.end - res.start + 1);
  96         if (priv->regs == NULL) {
  97                 err = -ENOMEM;
  98                 goto out_free;
  99         }
 100
 101         snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 102         bus->priv = priv;
 103
 104         bus->parent = dev;
 105         dev_set_drvdata(dev, bus);
 106
 107         /* set MII speed */
 108         out_be32(&priv->regs->mii_speed,
 109                 ((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1);
 110
 111         err = of_mdiobus_register(bus, np);
 112         if (err)
 113                 goto out_unmap;
 114
 115         return 0;
 116
 117  out_unmap:
 118         iounmap(priv->regs);
 119  out_free:
 120         for (i=0; i<PHY_MAX_ADDR; i++)
 121                 if (bus->irq[i] != PHY_POLL)
 122                         irq_dispose_mapping(bus->irq[i]);
 123         kfree(bus->irq);
 124         kfree(priv);
 125         mdiobus_free(bus);
 126
 127         return err;
 128 }
 129
 130 static int mpc52xx_fec_mdio_remove(struct of_device *of)
 131 {
 132         struct device *dev = &of->dev;
 133         struct mii_bus *bus = dev_get_drvdata(dev);
 134         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
 135         int i;
 136
 137         mdiobus_unregister(bus);
 138         dev_set_drvdata(dev, NULL);
 139
 140         iounmap(priv->regs);
 141         for (i=0; i<PHY_MAX_ADDR; i++)
 142                 if (bus->irq[i] != PHY_POLL)
 143                         irq_dispose_mapping(bus->irq[i]);
 144         kfree(priv);
 145         kfree(bus->irq);
 146         mdiobus_free(bus);
 147
 148         return 0;
 149 }
 150
 151
 152 static struct of_device_id mpc52xx_fec_mdio_match[] = {
 153         { .compatible = "fsl,mpc5200b-mdio", },
 154         { .compatible = "fsl,mpc5200-mdio", },
 155         { .compatible = "mpc5200b-fec-phy", },
 156         {}
 157 };
 158 MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
 159
 160 struct of_platform_driver mpc52xx_fec_mdio_driver = {
 161         .name = "mpc5200b-fec-phy",
 162         .probe = mpc52xx_fec_mdio_probe,
 163         .remove = mpc52xx_fec_mdio_remove,
 164         .match_table = mpc52xx_fec_mdio_match,
 165 };
 166
 167 /* let fec driver call it, since this has to be registered before it */
 168 EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
 169
 170
 171 MODULE_LICENSE("Dual BSD/GPL");