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