drivers/net/ethernet/freescale/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 {
  66         struct device *dev = &of->dev;
  67         struct device_node *np = of->dev.of_node;
  68         struct mii_bus *bus;
  69         struct mpc52xx_fec_mdio_priv *priv;
  70         struct resource res;
  71         int err;
  72
  73         bus = mdiobus_alloc();
  74         if (bus == NULL)
  75                 return -ENOMEM;
  76         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  77         if (priv == NULL) {
  78                 err = -ENOMEM;
  79                 goto out_free;
  80         }
  81
  82         bus->name = "mpc52xx MII bus";
  83         bus->read = mpc52xx_fec_mdio_read;
  84         bus->write = mpc52xx_fec_mdio_write;
  85
  86         /* setup irqs */
  87         bus->irq = priv->mdio_irqs;
  88
  89         /* setup registers */
  90         err = of_address_to_resource(np, 0, &res);
  91         if (err)
  92                 goto out_free;
  93         priv->regs = ioremap(res.start, resource_size(&res));
  94         if (priv->regs == NULL) {
  95                 err = -ENOMEM;
  96                 goto out_free;
  97         }
  98
  99         snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 100         bus->priv = priv;
 101
 102         bus->parent = dev;
 103         dev_set_drvdata(dev, bus);
 104
 105         /* set MII speed */
 106         out_be32(&priv->regs->mii_speed,
 107                 ((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1);
 108
 109         err = of_mdiobus_register(bus, np);
 110         if (err)
 111                 goto out_unmap;
 112
 113         return 0;
 114
 115  out_unmap:
 116         iounmap(priv->regs);
 117  out_free:
 118         kfree(priv);
 119         mdiobus_free(bus);
 120
 121         return err;
 122 }
 123
 124 static int mpc52xx_fec_mdio_remove(struct platform_device *of)
 125 {
 126         struct device *dev = &of->dev;
 127         struct mii_bus *bus = dev_get_drvdata(dev);
 128         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
 129
 130         mdiobus_unregister(bus);
 131         dev_set_drvdata(dev, NULL);
 132         iounmap(priv->regs);
 133         kfree(priv);
 134         mdiobus_free(bus);
 135
 136         return 0;
 137 }
 138
 139 static struct of_device_id mpc52xx_fec_mdio_match[] = {
 140         { .compatible = "fsl,mpc5200b-mdio", },
 141         { .compatible = "fsl,mpc5200-mdio", },
 142         { .compatible = "mpc5200b-fec-phy", },
 143         {}
 144 };
 145 MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
 146
 147 struct platform_driver mpc52xx_fec_mdio_driver = {
 148         .driver = {
 149                 .name = "mpc5200b-fec-phy",
 150                 .owner = THIS_MODULE,
 151                 .of_match_table = mpc52xx_fec_mdio_match,
 152         },
 153         .probe = mpc52xx_fec_mdio_probe,
 154         .remove = mpc52xx_fec_mdio_remove,
 155 };
 156
 157 /* let fec driver call it, since this has to be registered before it */
 158 EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
 159
 160 MODULE_LICENSE("Dual BSD/GPL");