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 #include <asm/mpc5xxx.h>
  40
  41 #include "fs_enet.h"
  42 #include "fec.h"
  43
  44 /* Make MII read/write commands for the FEC.
  45 */
  46 #define mk_mii_read(REG)        (0x60020000 | ((REG & 0x1f) << 18))
  47 #define mk_mii_write(REG, VAL)  (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
  48 #define mk_mii_end              0
  49
  50 #define FEC_MII_LOOPS   10000
  51
  52 static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
  53 {
  54         struct fec_info* fec = bus->priv;
  55         struct fec __iomem *fecp = fec->fecp;
  56         int i, ret = -1;
  57
  58         BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
  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         struct fec __iomem *fecp = fec->fecp;
  79         int i;
  80
  81         /* this must never happen */
  82         BUG_ON((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0);
  83
  84         /* Add PHY address to register command.  */
  85         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
  86
  87         for (i = 0; i < FEC_MII_LOOPS; i++)
  88                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
  89                         break;
  90
  91         if (i < FEC_MII_LOOPS)
  92                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
  93
  94         return 0;
  95
  96 }
  97
  98 static int fs_enet_fec_mii_reset(struct mii_bus *bus)
  99 {
 100         /* nothing here - for now */
 101         return 0;
 102 }
 103
 104 static struct of_device_id fs_enet_mdio_fec_match[];
 105 static int __devinit fs_enet_mdio_probe(struct platform_device *ofdev)
 106 {
 107         const struct of_device_id *match;
 108         struct resource res;
 109         struct mii_bus *new_bus;
 110         struct fec_info *fec;
 111         int (*get_bus_freq)(struct device_node *);
 112         int ret = -ENOMEM, clock, speed;
 113
 114         match = of_match_device(fs_enet_mdio_fec_match, &ofdev->dev);
 115         if (!match)
 116                 return -EINVAL;
 117         get_bus_freq = match->data;
 118
 119         new_bus = mdiobus_alloc();
 120         if (!new_bus)
 121                 goto out;
 122
 123         fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
 124         if (!fec)
 125                 goto out_mii;
 126
 127         new_bus->priv = fec;
 128         new_bus->name = "FEC MII Bus";
 129         new_bus->read = &fs_enet_fec_mii_read;
 130         new_bus->write = &fs_enet_fec_mii_write;
 131         new_bus->reset = &fs_enet_fec_mii_reset;
 132
 133         ret = of_address_to_resource(ofdev->dev.of_node, 0, &res);
 134         if (ret)
 135                 goto out_res;
 136
 137         snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", res.start);
 138
 139         fec->fecp = ioremap(res.start, resource_size(&res));
 140         if (!fec->fecp)
 141                 goto out_fec;
 142
 143         if (get_bus_freq) {
 144                 clock = get_bus_freq(ofdev->dev.of_node);
 145                 if (!clock) {
 146                         /* Use maximum divider if clock is unknown */
 147                         dev_warn(&ofdev->dev, "could not determine IPS clock\n");
 148                         clock = 0x3F * 5000000;
 149                 }
 150         } else
 151                 clock = ppc_proc_freq;
 152
 153         /*
 154          * Scale for a MII clock <= 2.5 MHz
 155          * Note that only 6 bits (25:30) are available for MII speed.
 156          */
 157         speed = (clock + 4999999) / 5000000;
 158         if (speed > 0x3F) {
 159                 speed = 0x3F;
 160                 dev_err(&ofdev->dev,
 161                         "MII clock (%d Hz) exceeds max (2.5 MHz)\n",
 162                         clock / speed);
 163         }
 164
 165         fec->mii_speed = speed << 1;
 166
 167         setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
 168         setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
 169                                           FEC_ECNTRL_ETHER_EN);
 170         out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
 171         clrsetbits_be32(&fec->fecp->fec_mii_speed, 0x7E, fec->mii_speed);
 172
 173         new_bus->phy_mask = ~0;
 174         new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
 175         if (!new_bus->irq)
 176                 goto out_unmap_regs;
 177
 178         new_bus->parent = &ofdev->dev;
 179         dev_set_drvdata(&ofdev->dev, new_bus);
 180
 181         ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
 182         if (ret)
 183                 goto out_free_irqs;
 184
 185         return 0;
 186
 187 out_free_irqs:
 188         dev_set_drvdata(&ofdev->dev, NULL);
 189         kfree(new_bus->irq);
 190 out_unmap_regs:
 191         iounmap(fec->fecp);
 192 out_res:
 193 out_fec:
 194         kfree(fec);
 195 out_mii:
 196         mdiobus_free(new_bus);
 197 out:
 198         return ret;
 199 }
 200
 201 static int fs_enet_mdio_remove(struct platform_device *ofdev)
 202 {
 203         struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
 204         struct fec_info *fec = bus->priv;
 205
 206         mdiobus_unregister(bus);
 207         dev_set_drvdata(&ofdev->dev, NULL);
 208         kfree(bus->irq);
 209         iounmap(fec->fecp);
 210         kfree(fec);
 211         mdiobus_free(bus);
 212
 213         return 0;
 214 }
 215
 216 static struct of_device_id fs_enet_mdio_fec_match[] = {
 217         {
 218                 .compatible = "fsl,pq1-fec-mdio",
 219         },
 220 #if defined(CONFIG_PPC_MPC512x)
 221         {
 222                 .compatible = "fsl,mpc5121-fec-mdio",
 223                 .data = mpc5xxx_get_bus_frequency,
 224         },
 225 #endif
 226         {},
 227 };
 228 MODULE_DEVICE_TABLE(of, fs_enet_mdio_fec_match);
 229
 230 static struct platform_driver fs_enet_fec_mdio_driver = {
 231         .driver = {
 232                 .name = "fsl-fec-mdio",
 233                 .owner = THIS_MODULE,
 234                 .of_match_table = fs_enet_mdio_fec_match,
 235         },
 236         .probe = fs_enet_mdio_probe,
 237         .remove = fs_enet_mdio_remove,
 238 };
 239
 240 static int fs_enet_mdio_fec_init(void)
 241 {
 242         return platform_driver_register(&fs_enet_fec_mdio_driver);
 243 }
 244
 245 static void fs_enet_mdio_fec_exit(void)
 246 {
 247         platform_driver_unregister(&fs_enet_fec_mdio_driver);
 248 }
 249
 250 module_init(fs_enet_mdio_fec_init);
 251 module_exit(fs_enet_mdio_fec_exit);