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/sched.h>
  19 #include <linux/string.h>
  20 #include <linux/ptrace.h>
  21 #include <linux/errno.h>
  22 #include <linux/ioport.h>
  23 #include <linux/slab.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/pci.h>
  26 #include <linux/init.h>
  27 #include <linux/delay.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/etherdevice.h>
  30 #include <linux/skbuff.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/mii.h>
  33 #include <linux/ethtool.h>
  34 #include <linux/bitops.h>
  35 #include <linux/platform_device.h>
  36
  37 #include <asm/pgtable.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.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 match_has_phy (struct device *dev, void* data)
  53 {
  54         struct platform_device* pdev = container_of(dev, struct platform_device, dev);
  55         struct fs_platform_info* fpi;
  56         if(strcmp(pdev->name, (char*)data))
  57         {
  58             return 0;
  59         }
  60
  61         fpi = pdev->dev.platform_data;
  62         if((fpi)&&(fpi->has_phy))
  63                 return 1;
  64         return 0;
  65 }
  66
  67 static int fs_mii_fec_init(struct fec_info* fec, struct fs_mii_fec_platform_info *fmpi)
  68 {
  69         struct resource *r;
  70         fec_t *fecp;
  71         char* name = "fsl-cpm-fec";
  72
  73         /* we need fec in order to be useful */
  74         struct platform_device *fec_pdev =
  75                 container_of(bus_find_device(&platform_bus_type, NULL, name, match_has_phy),
  76                                 struct platform_device, dev);
  77
  78         if(fec_pdev == NULL) {
  79                 printk(KERN_ERR"Unable to find PHY for %s", name);
  80                 return -ENODEV;
  81         }
  82
  83         r = platform_get_resource_byname(fec_pdev, IORESOURCE_MEM, "regs");
  84
  85         fec->fecp = fecp = (fec_t*)ioremap(r->start,sizeof(fec_t));
  86         fec->mii_speed = fmpi->mii_speed;
  87
  88         setbits32(&fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);     /* MII enable */
  89         setbits32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
  90         out_be32(&fecp->fec_ievent, FEC_ENET_MII);
  91         out_be32(&fecp->fec_mii_speed, fec->mii_speed);
  92
  93         return 0;
  94 }
  95
  96 static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
  97 {
  98         struct fec_info* fec = bus->priv;
  99         fec_t *fecp = fec->fecp;
 100         int i, ret = -1;
 101
 102         if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
 103                 BUG();
 104
 105         /* Add PHY address to register command.  */
 106         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
 107
 108         for (i = 0; i < FEC_MII_LOOPS; i++)
 109                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
 110                         break;
 111
 112         if (i < FEC_MII_LOOPS) {
 113                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
 114                 ret = in_be32(&fecp->fec_mii_data) & 0xffff;
 115         }
 116
 117         return ret;
 118
 119 }
 120
 121 static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
 122 {
 123         struct fec_info* fec = bus->priv;
 124         fec_t *fecp = fec->fecp;
 125         int i;
 126
 127         /* this must never happen */
 128         if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
 129                 BUG();
 130
 131         /* Add PHY address to register command.  */
 132         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
 133
 134         for (i = 0; i < FEC_MII_LOOPS; i++)
 135                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
 136                         break;
 137
 138         if (i < FEC_MII_LOOPS)
 139                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
 140
 141         return 0;
 142
 143 }
 144
 145 static int fs_enet_fec_mii_reset(struct mii_bus *bus)
 146 {
 147         /* nothing here - for now */
 148         return 0;
 149 }
 150
 151 static int __devinit fs_enet_fec_mdio_probe(struct device *dev)
 152 {
 153         struct platform_device *pdev = to_platform_device(dev);
 154         struct fs_mii_fec_platform_info *pdata;
 155         struct mii_bus *new_bus;
 156         struct fec_info *fec;
 157         int err = 0;
 158         if (NULL == dev)
 159                 return -EINVAL;
 160         new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
 161
 162         if (NULL == new_bus)
 163                 return -ENOMEM;
 164
 165         fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
 166
 167         if (NULL == fec)
 168                 return -ENOMEM;
 169
 170         new_bus->name = "FEC MII Bus",
 171         new_bus->read = &fs_enet_fec_mii_read,
 172         new_bus->write = &fs_enet_fec_mii_write,
 173         new_bus->reset = &fs_enet_fec_mii_reset,
 174         new_bus->id = pdev->id;
 175
 176         pdata = (struct fs_mii_fec_platform_info *)pdev->dev.platform_data;
 177
 178         if (NULL == pdata) {
 179                 printk(KERN_ERR "fs_enet FEC mdio %d: Missing platform data!\n", pdev->id);
 180                 return -ENODEV;
 181         }
 182
 183         /*set up workspace*/
 184
 185         fs_mii_fec_init(fec, pdata);
 186         new_bus->priv = fec;
 187
 188         new_bus->irq = pdata->irq;
 189
 190         new_bus->dev = dev;
 191         dev_set_drvdata(dev, new_bus);
 192
 193         err = mdiobus_register(new_bus);
 194
 195         if (0 != err) {
 196                 printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
 197                                 new_bus->name);
 198                 goto bus_register_fail;
 199         }
 200
 201         return 0;
 202
 203 bus_register_fail:
 204         kfree(new_bus);
 205
 206         return err;
 207 }
 208
 209
 210 static int fs_enet_fec_mdio_remove(struct device *dev)
 211 {
 212         struct mii_bus *bus = dev_get_drvdata(dev);
 213
 214         mdiobus_unregister(bus);
 215
 216         dev_set_drvdata(dev, NULL);
 217         kfree(bus->priv);
 218
 219         bus->priv = NULL;
 220         kfree(bus);
 221
 222         return 0;
 223 }
 224
 225 static struct device_driver fs_enet_fec_mdio_driver = {
 226         .name = "fsl-cpm-fec-mdio",
 227         .bus = &platform_bus_type,
 228         .probe = fs_enet_fec_mdio_probe,
 229         .remove = fs_enet_fec_mdio_remove,
 230 };
 231
 232 int fs_enet_mdio_fec_init(void)
 233 {
 234         return driver_register(&fs_enet_fec_mdio_driver);
 235 }
 236
 237 void fs_enet_mdio_fec_exit(void)
 238 {
 239         driver_unregister(&fs_enet_fec_mdio_driver);
 240 }
 241