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