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;
  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         fec = priv->regs;
  39         out_be32(&fec->ievent, FEC_IEVENT_MII);
  40         out_be32(&priv->regs->mii_data, value);
  41
  42         /* wait for it to finish, this takes about 23 us on lite5200b */
  43         while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
  44                 msleep(1);
  45
  46         if (!tries)
  47                 return -ETIMEDOUT;
  48
  49         return value & FEC_MII_DATA_OP_RD ?
  50                 in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
  51 }
  52
  53 static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
  54 {
  55         return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
  56 }
  57
  58 static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
  59                 u16 data)
  60 {
  61         return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
  62                 data | FEC_MII_WRITE_FRAME);
  63 }
  64
  65 static int mpc52xx_fec_mdio_probe(struct of_device *of,
  66                 const struct of_device_id *match)
  67 {
  68         struct device *dev = &of->dev;
  69         struct device_node *np = of->node;
  70         struct mii_bus *bus;
  71         struct mpc52xx_fec_mdio_priv *priv;
  72         struct resource res = {};
  73         int err;
  74         int i;
  75
  76         bus = mdiobus_alloc();
  77         if (bus == NULL)
  78                 return -ENOMEM;
  79         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  80         if (priv == NULL) {
  81                 err = -ENOMEM;
  82                 goto out_free;
  83         }
  84
  85         bus->name = "mpc52xx MII bus";
  86         bus->read = mpc52xx_fec_mdio_read;
  87         bus->write = mpc52xx_fec_mdio_write;
  88
  89         /* setup irqs */
  90         bus->irq = priv->mdio_irqs;
  91
  92         /* setup registers */
  93         err = of_address_to_resource(np, 0, &res);
  94         if (err)
  95                 goto out_free;
  96         priv->regs = ioremap(res.start, res.end - res.start + 1);
  97         if (priv->regs == NULL) {
  98                 err = -ENOMEM;
  99                 goto out_free;
 100         }
 101
 102         snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 103         bus->priv = priv;
 104
 105         bus->parent = dev;
 106         dev_set_drvdata(dev, bus);
 107
 108         /* set MII speed */
 109         out_be32(&priv->regs->mii_speed,
 110                 ((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1);
 111
 112         err = of_mdiobus_register(bus, np);
 113         if (err)
 114                 goto out_unmap;
 115
 116         return 0;
 117
 118  out_unmap:
 119         iounmap(priv->regs);
 120  out_free:
 121         for (i=0; i<PHY_MAX_ADDR; i++)
 122                 if (bus->irq[i] != PHY_POLL)
 123                         irq_dispose_mapping(bus->irq[i]);
 124         kfree(bus->irq);
 125         kfree(priv);
 126         mdiobus_free(bus);
 127
 128         return err;
 129 }
 130
 131 static int mpc52xx_fec_mdio_remove(struct of_device *of)
 132 {
 133         struct device *dev = &of->dev;
 134         struct mii_bus *bus = dev_get_drvdata(dev);
 135         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
 136         int i;
 137
 138         mdiobus_unregister(bus);
 139         dev_set_drvdata(dev, NULL);
 140
 141         iounmap(priv->regs);
 142         for (i=0; i<PHY_MAX_ADDR; i++)
 143                 if (bus->irq[i] != PHY_POLL)
 144                         irq_dispose_mapping(bus->irq[i]);
 145         kfree(priv);
 146         kfree(bus->irq);
 147         mdiobus_free(bus);
 148
 149         return 0;
 150 }
 151
 152
 153 static struct of_device_id mpc52xx_fec_mdio_match[] = {
 154         { .compatible = "fsl,mpc5200b-mdio", },
 155         { .compatible = "fsl,mpc5200-mdio", },
 156         { .compatible = "mpc5200b-fec-phy", },
 157         {}
 158 };
 159 MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
 160
 161 struct of_platform_driver mpc52xx_fec_mdio_driver = {
 162         .name = "mpc5200b-fec-phy",
 163         .probe = mpc52xx_fec_mdio_probe,
 164         .remove = mpc52xx_fec_mdio_remove,
 165         .match_table = mpc52xx_fec_mdio_match,
 166 };
 167
 168 /* let fec driver call it, since this has to be registered before it */
 169 EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
 170
 171
 172 MODULE_LICENSE("Dual BSD/GPL");