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  *
   6  * This file is licensed under the terms of the GNU General Public License
   7  * version 2. This program is licensed "as is" without any warranty of any
   8  * kind, whether express or implied.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/netdevice.h>
  14 #include <linux/phy.h>
  15 #include <linux/of_platform.h>
  16 #include <asm/io.h>
  17 #include <asm/mpc52xx.h>
  18 #include "fec_mpc52xx.h"
  19
  20 struct mpc52xx_fec_mdio_priv {
  21         struct mpc52xx_fec __iomem *regs;
  22 };
  23
  24 static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
  25 {
  26         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
  27         struct mpc52xx_fec __iomem *fec;
  28         int tries = 100;
  29         u32 request = FEC_MII_READ_FRAME;
  30
  31         fec = priv->regs;
  32         out_be32(&fec->ievent, FEC_IEVENT_MII);
  33
  34         request |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
  35         request |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
  36
  37         out_be32(&priv->regs->mii_data, request);
  38
  39         /* wait for it to finish, this takes about 23 us on lite5200b */
  40         while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
  41                 udelay(5);
  42
  43         if (tries == 0)
  44                 return -ETIMEDOUT;
  45
  46         return in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK;
  47 }
  48
  49 static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
  50 {
  51         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
  52         struct mpc52xx_fec __iomem *fec;
  53         u32 value = data;
  54         int tries = 100;
  55
  56         fec = priv->regs;
  57         out_be32(&fec->ievent, FEC_IEVENT_MII);
  58
  59         value |= FEC_MII_WRITE_FRAME;
  60         value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
  61         value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
  62
  63         out_be32(&priv->regs->mii_data, value);
  64
  65         /* wait for request to finish */
  66         while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
  67                 udelay(5);
  68
  69         if (tries == 0)
  70                 return -ETIMEDOUT;
  71
  72         return 0;
  73 }
  74
  75 static int mpc52xx_fec_mdio_probe(struct of_device *of, const struct of_device_id *match)
  76 {
  77         struct device *dev = &of->dev;
  78         struct device_node *np = of->node;
  79         struct device_node *child = NULL;
  80         struct mii_bus *bus;
  81         struct mpc52xx_fec_mdio_priv *priv;
  82         struct resource res = {};
  83         int err;
  84         int i;
  85
  86         bus = kzalloc(sizeof(*bus), GFP_KERNEL);
  87         if (bus == NULL)
  88                 return -ENOMEM;
  89         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  90         if (priv == NULL) {
  91                 err = -ENOMEM;
  92                 goto out_free;
  93         }
  94
  95         bus->name = "mpc52xx MII bus";
  96         bus->read = mpc52xx_fec_mdio_read;
  97         bus->write = mpc52xx_fec_mdio_write;
  98
  99         /* setup irqs */
 100         bus->irq = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
 101         if (bus->irq == NULL) {
 102                 err = -ENOMEM;
 103                 goto out_free;
 104         }
 105         for (i=0; i<PHY_MAX_ADDR; i++)
 106                 bus->irq[i] = PHY_POLL;
 107
 108         while ((child = of_get_next_child(np, child)) != NULL) {
 109                 int irq = irq_of_parse_and_map(child, 0);
 110                 if (irq != NO_IRQ) {
 111                         const u32 *id = of_get_property(child, "reg", NULL);
 112                         bus->irq[*id] = irq;
 113                 }
 114         }
 115
 116         /* setup registers */
 117         err = of_address_to_resource(np, 0, &res);
 118         if (err)
 119                 goto out_free;
 120         priv->regs = ioremap(res.start, res.end - res.start + 1);
 121         if (priv->regs == NULL) {
 122                 err = -ENOMEM;
 123                 goto out_free;
 124         }
 125
 126         bus->id = res.start;
 127         bus->priv = priv;
 128
 129         bus->dev = dev;
 130         dev_set_drvdata(dev, bus);
 131
 132         /* set MII speed */
 133         out_be32(&priv->regs->mii_speed, ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
 134
 135         /* enable MII interrupt */
 136         out_be32(&priv->regs->imask, in_be32(&priv->regs->imask) | FEC_IMASK_MII);
 137
 138         err = mdiobus_register(bus);
 139         if (err)
 140                 goto out_unmap;
 141
 142         return 0;
 143
 144  out_unmap:
 145         iounmap(priv->regs);
 146  out_free:
 147         for (i=0; i<PHY_MAX_ADDR; i++)
 148                 if (bus->irq[i] != PHY_POLL)
 149                         irq_dispose_mapping(bus->irq[i]);
 150         kfree(bus->irq);
 151         kfree(priv);
 152         kfree(bus);
 153
 154         return err;
 155 }
 156
 157 static int mpc52xx_fec_mdio_remove(struct of_device *of)
 158 {
 159         struct device *dev = &of->dev;
 160         struct mii_bus *bus = dev_get_drvdata(dev);
 161         struct mpc52xx_fec_mdio_priv *priv = bus->priv;
 162         int i;
 163
 164         mdiobus_unregister(bus);
 165         dev_set_drvdata(dev, NULL);
 166
 167         iounmap(priv->regs);
 168         for (i=0; i<PHY_MAX_ADDR; i++)
 169                 if (bus->irq[i])
 170                         irq_dispose_mapping(bus->irq[i]);
 171         kfree(priv);
 172         kfree(bus->irq);
 173         kfree(bus);
 174
 175         return 0;
 176 }
 177
 178
 179 static struct of_device_id mpc52xx_fec_mdio_match[] = {
 180         {
 181                 .type = "mdio",
 182                 .compatible = "mpc5200b-fec-phy",
 183         },
 184         {},
 185 };
 186
 187 struct of_platform_driver mpc52xx_fec_mdio_driver = {
 188         .name = "mpc5200b-fec-phy",
 189         .probe = mpc52xx_fec_mdio_probe,
 190         .remove = mpc52xx_fec_mdio_remove,
 191         .match_table = mpc52xx_fec_mdio_match,
 192 };
 193
 194 /* let fec driver call it, since this has to be registered before it */
 195 EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
 196
 197
 198 MODULE_LICENSE("Dual BSD/GPL");