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
  16 #include <linux/config.h>
  17 #include <linux/module.h>
  18 #include <linux/types.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/string.h>
  22 #include <linux/ptrace.h>
  23 #include <linux/errno.h>
  24 #include <linux/ioport.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/pci.h>
  28 #include <linux/init.h>
  29 #include <linux/delay.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/skbuff.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/mii.h>
  35 #include <linux/ethtool.h>
  36 #include <linux/bitops.h>
  37 #include <linux/platform_device.h>
  38
  39 #include <asm/pgtable.h>
  40 #include <asm/irq.h>
  41 #include <asm/uaccess.h>
  42
  43 #include "fs_enet.h"
  44 #include "fec.h"
  45
  46 /* Make MII read/write commands for the FEC.
  47 */
  48 #define mk_mii_read(REG)        (0x60020000 | ((REG & 0x1f) << 18))
  49 #define mk_mii_write(REG, VAL)  (0x50020000 | ((REG & 0x1f) << 18) | (VAL & 0xffff))
  50 #define mk_mii_end              0
  51
  52 #define FEC_MII_LOOPS   10000
  53
  54 static int match_has_phy (struct device *dev, void* data)
  55 {
  56         struct platform_device* pdev = container_of(dev, struct platform_device, dev);
  57         struct fs_platform_info* fpi;
  58         if(strcmp(pdev->name, (char*)data))
  59         {
  60             return 0;
  61         }
  62
  63         fpi = pdev->dev.platform_data;
  64         if((fpi)&&(fpi->has_phy))
  65                 return 1;
  66         return 0;
  67 }
  68
  69 static int fs_mii_fec_init(struct fec_info* fec, struct fs_mii_fec_platform_info *fmpi)
  70 {
  71         struct resource *r;
  72         fec_t *fecp;
  73         char* name = "fsl-cpm-fec";
  74
  75         /* we need fec in order to be useful */
  76         struct platform_device *fec_pdev =
  77                 container_of(bus_find_device(&platform_bus_type, NULL, name, match_has_phy),
  78                                 struct platform_device, dev);
  79
  80         if(fec_pdev == NULL) {
  81                 printk(KERN_ERR"Unable to find PHY for %s", name);
  82                 return -ENODEV;
  83         }
  84
  85         r = platform_get_resource_byname(fec_pdev, IORESOURCE_MEM, "regs");
  86
  87         fec->fecp = fecp = (fec_t*)ioremap(r->start,sizeof(fec_t));
  88         fec->mii_speed = fmpi->mii_speed;
  89
  90         setbits32(&fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);     /* MII enable */
  91         setbits32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
  92         out_be32(&fecp->fec_ievent, FEC_ENET_MII);
  93         out_be32(&fecp->fec_mii_speed, fec->mii_speed);
  94
  95         return 0;
  96 }
  97
  98 static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
  99 {
 100         struct fec_info* fec = bus->priv;
 101         fec_t *fecp = fec->fecp;
 102         int i, ret = -1;
 103
 104         if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
 105                 BUG();
 106
 107         /* Add PHY address to register command.  */
 108         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
 109
 110         for (i = 0; i < FEC_MII_LOOPS; i++)
 111                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
 112                         break;
 113
 114         if (i < FEC_MII_LOOPS) {
 115                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
 116                 ret = in_be32(&fecp->fec_mii_data) & 0xffff;
 117         }
 118
 119         return ret;
 120
 121 }
 122
 123 static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
 124 {
 125         struct fec_info* fec = bus->priv;
 126         fec_t *fecp = fec->fecp;
 127         int i;
 128
 129         /* this must never happen */
 130         if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
 131                 BUG();
 132
 133         /* Add PHY address to register command.  */
 134         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
 135
 136         for (i = 0; i < FEC_MII_LOOPS; i++)
 137                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
 138                         break;
 139
 140         if (i < FEC_MII_LOOPS)
 141                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
 142
 143         return 0;
 144
 145 }
 146
 147 static int fs_enet_fec_mii_reset(struct mii_bus *bus)
 148 {
 149         /* nothing here - for now */
 150         return 0;
 151 }
 152
 153 static int __devinit fs_enet_fec_mdio_probe(struct device *dev)
 154 {
 155         struct platform_device *pdev = to_platform_device(dev);
 156         struct fs_mii_fec_platform_info *pdata;
 157         struct mii_bus *new_bus;
 158         struct fec_info *fec;
 159         int err = 0;
 160         if (NULL == dev)
 161                 return -EINVAL;
 162         new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
 163
 164         if (NULL == new_bus)
 165                 return -ENOMEM;
 166
 167         fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
 168
 169         if (NULL == fec)
 170                 return -ENOMEM;
 171
 172         new_bus->name = "FEC MII Bus",
 173         new_bus->read = &fs_enet_fec_mii_read,
 174         new_bus->write = &fs_enet_fec_mii_write,
 175         new_bus->reset = &fs_enet_fec_mii_reset,
 176         new_bus->id = pdev->id;
 177
 178         pdata = (struct fs_mii_fec_platform_info *)pdev->dev.platform_data;
 179
 180         if (NULL == pdata) {
 181                 printk(KERN_ERR "fs_enet FEC mdio %d: Missing platform data!\n", pdev->id);
 182                 return -ENODEV;
 183         }
 184
 185         /*set up workspace*/
 186
 187         fs_mii_fec_init(fec, pdata);
 188         new_bus->priv = fec;
 189
 190         new_bus->irq = pdata->irq;
 191
 192         new_bus->dev = dev;
 193         dev_set_drvdata(dev, new_bus);
 194
 195         err = mdiobus_register(new_bus);
 196
 197         if (0 != err) {
 198                 printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
 199                                 new_bus->name);
 200                 goto bus_register_fail;
 201         }
 202
 203         return 0;
 204
 205 bus_register_fail:
 206         kfree(new_bus);
 207
 208         return err;
 209 }
 210
 211
 212 static int fs_enet_fec_mdio_remove(struct device *dev)
 213 {
 214         struct mii_bus *bus = dev_get_drvdata(dev);
 215
 216         mdiobus_unregister(bus);
 217
 218         dev_set_drvdata(dev, NULL);
 219         kfree(bus->priv);
 220
 221         bus->priv = NULL;
 222         kfree(bus);
 223
 224         return 0;
 225 }
 226
 227 static struct device_driver fs_enet_fec_mdio_driver = {
 228         .name = "fsl-cpm-fec-mdio",
 229         .bus = &platform_bus_type,
 230         .probe = fs_enet_fec_mdio_probe,
 231         .remove = fs_enet_fec_mdio_remove,
 232 };
 233
 234 int fs_enet_mdio_fec_init(void)
 235 {
 236         return driver_register(&fs_enet_fec_mdio_driver);
 237 }
 238
 239 void fs_enet_mdio_fec_exit(void)
 240 {
 241         driver_unregister(&fs_enet_fec_mdio_driver);
 242 }
 243