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         BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
  58
  59         /* Add PHY address to register command.  */
  60         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
  61
  62         for (i = 0; i < FEC_MII_LOOPS; i++)
  63                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
  64                         break;
  65
  66         if (i < FEC_MII_LOOPS) {
  67                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
  68                 ret = in_be32(&fecp->fec_mii_data) & 0xffff;
  69         }
  70
  71         return ret;
  72 }
  73
  74 static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
  75 {
  76         struct fec_info* fec = bus->priv;
  77         fec_t __iomem *fecp = fec->fecp;
  78         int i;
  79
  80         /* this must never happen */
  81         BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
  82
  83         /* Add PHY address to register command.  */
  84         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
  85
  86         for (i = 0; i < FEC_MII_LOOPS; i++)
  87                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
  88                         break;
  89
  90         if (i < FEC_MII_LOOPS)
  91                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
  92
  93         return 0;
  94
  95 }
  96
  97 static int fs_enet_fec_mii_reset(struct mii_bus *bus)
  98 {
  99         /* nothing here - for now */
 100         return 0;
 101 }
 102
 103 static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
 104 {
 105         const u32 *data;
 106         int len, id, irq;
 107
 108         data = of_get_property(np, "reg", &len);
 109         if (!data || len != 4)
 110                 return;
 111
 112         id = *data;
 113         bus->phy_mask &= ~(1 << id);
 114
 115         irq = of_irq_to_resource(np, 0, NULL);
 116         if (irq != NO_IRQ)
 117                 bus->irq[id] = irq;
 118 }
 119
 120 static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
 121                                         const struct of_device_id *match)
 122 {
 123         struct device_node *np = NULL;
 124         struct resource res;
 125         struct mii_bus *new_bus;
 126         struct fec_info *fec;
 127         int ret = -ENOMEM, i;
 128
 129         new_bus = mdiobus_alloc();
 130         if (!new_bus)
 131                 goto out;
 132
 133         fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
 134         if (!fec)
 135                 goto out_mii;
 136
 137         new_bus->priv = fec;
 138         new_bus->name = "FEC MII Bus";
 139         new_bus->read = &fs_enet_fec_mii_read;
 140         new_bus->write = &fs_enet_fec_mii_write;
 141         new_bus->reset = &fs_enet_fec_mii_reset;
 142
 143         ret = of_address_to_resource(ofdev->node, 0, &res);
 144         if (ret)
 145                 goto out_res;
 146
 147         snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 148
 149         fec->fecp = ioremap(res.start, res.end - res.start + 1);
 150         if (!fec->fecp)
 151                 goto out_fec;
 152
 153         fec->mii_speed = ((ppc_proc_freq + 4999999) / 5000000) << 1;
 154
 155         setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
 156         setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
 157                                           FEC_ECNTRL_ETHER_EN);
 158         out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
 159         out_be32(&fec->fecp->fec_mii_speed, fec->mii_speed);
 160
 161         new_bus->phy_mask = ~0;
 162         new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
 163         if (!new_bus->irq)
 164                 goto out_unmap_regs;
 165
 166         for (i = 0; i < PHY_MAX_ADDR; i++)
 167                 new_bus->irq[i] = -1;
 168
 169         while ((np = of_get_next_child(ofdev->node, np)))
 170                 if (!strcmp(np->type, "ethernet-phy"))
 171                         add_phy(new_bus, np);
 172
 173         new_bus->parent = &ofdev->dev;
 174         dev_set_drvdata(&ofdev->dev, new_bus);
 175
 176         ret = mdiobus_register(new_bus);
 177         if (ret)
 178                 goto out_free_irqs;
 179
 180         return 0;
 181
 182 out_free_irqs:
 183         dev_set_drvdata(&ofdev->dev, NULL);
 184         kfree(new_bus->irq);
 185 out_unmap_regs:
 186         iounmap(fec->fecp);
 187 out_res:
 188 out_fec:
 189         kfree(fec);
 190 out_mii:
 191         mdiobus_free(new_bus);
 192 out:
 193         return ret;
 194 }
 195
 196 static int fs_enet_mdio_remove(struct of_device *ofdev)
 197 {
 198         struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
 199         struct fec_info *fec = bus->priv;
 200
 201         mdiobus_unregister(bus);
 202         dev_set_drvdata(&ofdev->dev, NULL);
 203         kfree(bus->irq);
 204         iounmap(fec->fecp);
 205         kfree(fec);
 206         mdiobus_free(bus);
 207
 208         return 0;
 209 }
 210
 211 static struct of_device_id fs_enet_mdio_fec_match[] = {
 212         {
 213                 .compatible = "fsl,pq1-fec-mdio",
 214         },
 215         {},
 216 };
 217
 218 static struct of_platform_driver fs_enet_fec_mdio_driver = {
 219         .name = "fsl-fec-mdio",
 220         .match_table = fs_enet_mdio_fec_match,
 221         .probe = fs_enet_mdio_probe,
 222         .remove = fs_enet_mdio_remove,
 223 };
 224
 225 static int fs_enet_mdio_fec_init(void)
 226 {
 227         return of_register_platform_driver(&fs_enet_fec_mdio_driver);
 228 }
 229
 230 static void fs_enet_mdio_fec_exit(void)
 231 {
 232         of_unregister_platform_driver(&fs_enet_fec_mdio_driver);
 233 }
 234
 235 module_init(fs_enet_mdio_fec_init);
 236 module_exit(fs_enet_mdio_fec_exit);