drivers/net/fs_enet/mii-fec.c

   1 /*
   2  * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
   3  *
   4  * Copyright (c) 2003 Intracom S.A.
   5  *  by Pantelis Antoniou <panto@intracom.gr>
   6  *
   7  * 2005 (c) MontaVista Software, Inc.
   8  * Vitaly Bordug <vbordug@ru.mvista.com>
   9  *
  10  * This file is licensed under the terms of the GNU General Public License
  11  * version 2. This program is licensed "as is" without any warranty of any
  12  * kind, whether express or implied.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/string.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/errno.h>
  21 #include <linux/ioport.h>
  22 #include <linux/slab.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/init.h>
  25 #include <linux/delay.h>
  26 #include <linux/netdevice.h>
  27 #include <linux/etherdevice.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/spinlock.h>
  30 #include <linux/mii.h>
  31 #include <linux/ethtool.h>
  32 #include <linux/bitops.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/of_platform.h>
  35
  36 #include <asm/pgtable.h>
  37 #include <asm/irq.h>
  38 #include <asm/uaccess.h>
  39
  40 #include "fs_enet.h"
  41 #include "fec.h"
  42
  43 /* Make MII read/write commands for the FEC.
  44 */
  45 #define mk_mii_read(REG)        (0x60020000 | ((REG & 0x1f) << 18))
  46 #define mk_mii_write(REG, VAL)  (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
  47 #define mk_mii_end              0
  48
  49 #define FEC_MII_LOOPS   10000
  50
  51 static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
  52 {
  53         struct fec_info* fec = bus->priv;
  54         fec_t __iomem *fecp = fec->fecp;
  55         int i, ret = -1;
  56
  57         if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
  58                 BUG();
  59
  60         /* Add PHY address to register command.  */
  61         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
  62
  63         for (i = 0; i < FEC_MII_LOOPS; i++)
  64                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
  65                         break;
  66
  67         if (i < FEC_MII_LOOPS) {
  68                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
  69                 ret = in_be32(&fecp->fec_mii_data) & 0xffff;
  70         }
  71
  72         return ret;
  73 }
  74
  75 static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
  76 {
  77         struct fec_info* fec = bus->priv;
  78         fec_t __iomem *fecp = fec->fecp;
  79         int i;
  80
  81         /* this must never happen */
  82         if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
  83                 BUG();
  84
  85         /* Add PHY address to register command.  */
  86         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
  87
  88         for (i = 0; i < FEC_MII_LOOPS; i++)
  89                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
  90                         break;
  91
  92         if (i < FEC_MII_LOOPS)
  93                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
  94
  95         return 0;
  96
  97 }
  98
  99 static int fs_enet_fec_mii_reset(struct mii_bus *bus)
 100 {
 101         /* nothing here - for now */
 102         return 0;
 103 }
 104
 105 static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
 106 {
 107         const u32 *data;
 108         int len, id, irq;
 109
 110         data = of_get_property(np, "reg", &len);
 111         if (!data || len != 4)
 112                 return;
 113
 114         id = *data;
 115         bus->phy_mask &= ~(1 << id);
 116
 117         irq = of_irq_to_resource(np, 0, NULL);
 118         if (irq != NO_IRQ)
 119                 bus->irq[id] = irq;
 120 }
 121
 122 static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
 123                                         const struct of_device_id *match)
 124 {
 125         struct device_node *np = NULL;
 126         struct resource res;
 127         struct mii_bus *new_bus;
 128         struct fec_info *fec;
 129         int ret = -ENOMEM, i;
 130
 131         new_bus = mdiobus_alloc();
 132         if (!new_bus)
 133                 goto out;
 134
 135         fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
 136         if (!fec)
 137                 goto out_mii;
 138
 139         new_bus->priv = fec;
 140         new_bus->name = "FEC MII Bus";
 141         new_bus->read = &fs_enet_fec_mii_read;
 142         new_bus->write = &fs_enet_fec_mii_write;
 143         new_bus->reset = &fs_enet_fec_mii_reset;
 144
 145         ret = of_address_to_resource(ofdev->node, 0, &res);
 146         if (ret)
 147                 goto out_res;
 148
 149         snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 150
 151         fec->fecp = ioremap(res.start, res.end - res.start + 1);
 152         if (!fec->fecp)
 153                 goto out_fec;
 154
 155         fec->mii_speed = ((ppc_proc_freq + 4999999) / 5000000) << 1;
 156
 157         setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
 158         setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
 159                                           FEC_ECNTRL_ETHER_EN);
 160         out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
 161         out_be32(&fec->fecp->fec_mii_speed, fec->mii_speed);
 162
 163         new_bus->phy_mask = ~0;
 164         new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
 165         if (!new_bus->irq)
 166                 goto out_unmap_regs;
 167
 168         for (i = 0; i < PHY_MAX_ADDR; i++)
 169                 new_bus->irq[i] = -1;
 170
 171         while ((np = of_get_next_child(ofdev->node, np)))
 172                 if (!strcmp(np->type, "ethernet-phy"))
 173                         add_phy(new_bus, np);
 174
 175         new_bus->parent = &ofdev->dev;
 176         dev_set_drvdata(&ofdev->dev, new_bus);
 177
 178         ret = mdiobus_register(new_bus);
 179         if (ret)
 180                 goto out_free_irqs;
 181
 182         return 0;
 183
 184 out_free_irqs:
 185         dev_set_drvdata(&ofdev->dev, NULL);
 186         kfree(new_bus->irq);
 187 out_unmap_regs:
 188         iounmap(fec->fecp);
 189 out_res:
 190 out_fec:
 191         kfree(fec);
 192 out_mii:
 193         mdiobus_free(new_bus);
 194 out:
 195         return ret;
 196 }
 197
 198 static int fs_enet_mdio_remove(struct of_device *ofdev)
 199 {
 200         struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
 201         struct fec_info *fec = bus->priv;
 202
 203         mdiobus_unregister(bus);
 204         dev_set_drvdata(&ofdev->dev, NULL);
 205         kfree(bus->irq);
 206         iounmap(fec->fecp);
 207         kfree(fec);
 208         mdiobus_free(bus);
 209
 210         return 0;
 211 }
 212
 213 static struct of_device_id fs_enet_mdio_fec_match[] = {
 214         {
 215                 .compatible = "fsl,pq1-fec-mdio",
 216         },
 217         {},
 218 };
 219
 220 static struct of_platform_driver fs_enet_fec_mdio_driver = {
 221         .name = "fsl-fec-mdio",
 222         .match_table = fs_enet_mdio_fec_match,
 223         .probe = fs_enet_mdio_probe,
 224         .remove = fs_enet_mdio_remove,
 225 };
 226
 227 static int fs_enet_mdio_fec_init(void)
 228 {
 229         return of_register_platform_driver(&fs_enet_fec_mdio_driver);
 230 }
 231
 232 static void fs_enet_mdio_fec_exit(void)
 233 {
 234         of_unregister_platform_driver(&fs_enet_fec_mdio_driver);
 235 }
 236
 237 module_init(fs_enet_mdio_fec_init);
 238 module_exit(fs_enet_mdio_fec_exit);