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 #ifdef CONFIG_PPC_CPM_NEW_BINDING
  40 #include <asm/of_platform.h>
  41 #endif
  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 #ifndef CONFIG_PPC_CPM_NEW_BINDING
  55 static int match_has_phy (struct device *dev, void* data)
  56 {
  57         struct platform_device* pdev = container_of(dev, struct platform_device, dev);
  58         struct fs_platform_info* fpi;
  59         if(strcmp(pdev->name, (char*)data))
  60         {
  61             return 0;
  62         }
  63
  64         fpi = pdev->dev.platform_data;
  65         if((fpi)&&(fpi->has_phy))
  66                 return 1;
  67         return 0;
  68 }
  69
  70 static int fs_mii_fec_init(struct fec_info* fec, struct fs_mii_fec_platform_info *fmpi)
  71 {
  72         struct resource *r;
  73         fec_t __iomem *fecp;
  74         char* name = "fsl-cpm-fec";
  75
  76         /* we need fec in order to be useful */
  77         struct platform_device *fec_pdev =
  78                 container_of(bus_find_device(&platform_bus_type, NULL, name, match_has_phy),
  79                                 struct platform_device, dev);
  80
  81         if(fec_pdev == NULL) {
  82                 printk(KERN_ERR"Unable to find PHY for %s", name);
  83                 return -ENODEV;
  84         }
  85
  86         r = platform_get_resource_byname(fec_pdev, IORESOURCE_MEM, "regs");
  87
  88         fec->fecp = fecp = ioremap(r->start,sizeof(fec_t));
  89         fec->mii_speed = fmpi->mii_speed;
  90
  91         setbits32(&fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);     /* MII enable */
  92         setbits32(&fecp->fec_ecntrl, FEC_ECNTRL_PINMUX | FEC_ECNTRL_ETHER_EN);
  93         out_be32(&fecp->fec_ievent, FEC_ENET_MII);
  94         out_be32(&fecp->fec_mii_speed, fec->mii_speed);
  95
  96         return 0;
  97 }
  98 #endif
  99
 100 static int fs_enet_fec_mii_read(struct mii_bus *bus , int phy_id, int location)
 101 {
 102         struct fec_info* fec = bus->priv;
 103         fec_t __iomem *fecp = fec->fecp;
 104         int i, ret = -1;
 105
 106         if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
 107                 BUG();
 108
 109         /* Add PHY address to register command.  */
 110         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_read(location));
 111
 112         for (i = 0; i < FEC_MII_LOOPS; i++)
 113                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
 114                         break;
 115
 116         if (i < FEC_MII_LOOPS) {
 117                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
 118                 ret = in_be32(&fecp->fec_mii_data) & 0xffff;
 119         }
 120
 121         return ret;
 122 }
 123
 124 static int fs_enet_fec_mii_write(struct mii_bus *bus, int phy_id, int location, u16 val)
 125 {
 126         struct fec_info* fec = bus->priv;
 127         fec_t __iomem *fecp = fec->fecp;
 128         int i;
 129
 130         /* this must never happen */
 131         if ((in_be32(&fecp->fec_r_cntrl) & FEC_RCNTRL_MII_MODE) == 0)
 132                 BUG();
 133
 134         /* Add PHY address to register command.  */
 135         out_be32(&fecp->fec_mii_data, (phy_id << 23) | mk_mii_write(location, val));
 136
 137         for (i = 0; i < FEC_MII_LOOPS; i++)
 138                 if ((in_be32(&fecp->fec_ievent) & FEC_ENET_MII) != 0)
 139                         break;
 140
 141         if (i < FEC_MII_LOOPS)
 142                 out_be32(&fecp->fec_ievent, FEC_ENET_MII);
 143
 144         return 0;
 145
 146 }
 147
 148 static int fs_enet_fec_mii_reset(struct mii_bus *bus)
 149 {
 150         /* nothing here - for now */
 151         return 0;
 152 }
 153
 154 #ifdef CONFIG_PPC_CPM_NEW_BINDING
 155 static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
 156 {
 157         const u32 *data;
 158         int len, id, irq;
 159
 160         data = of_get_property(np, "reg", &len);
 161         if (!data || len != 4)
 162                 return;
 163
 164         id = *data;
 165         bus->phy_mask &= ~(1 << id);
 166
 167         irq = of_irq_to_resource(np, 0, NULL);
 168         if (irq != NO_IRQ)
 169                 bus->irq[id] = irq;
 170 }
 171
 172 static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
 173                                         const struct of_device_id *match)
 174 {
 175         struct device_node *np = NULL;
 176         struct resource res;
 177         struct mii_bus *new_bus;
 178         struct fec_info *fec;
 179         int ret = -ENOMEM, i;
 180
 181         new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
 182         if (!new_bus)
 183                 goto out;
 184
 185         fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
 186         if (!fec)
 187                 goto out_mii;
 188
 189         new_bus->priv = fec;
 190         new_bus->name = "FEC MII Bus";
 191         new_bus->read = &fs_enet_fec_mii_read;
 192         new_bus->write = &fs_enet_fec_mii_write;
 193         new_bus->reset = &fs_enet_fec_mii_reset;
 194
 195         ret = of_address_to_resource(ofdev->node, 0, &res);
 196         if (ret)
 197                 return ret;
 198
 199         new_bus->id = res.start;
 200
 201         fec->fecp = ioremap(res.start, res.end - res.start + 1);
 202         if (!fec->fecp)
 203                 goto out_fec;
 204
 205         fec->mii_speed = ((ppc_proc_freq + 4999999) / 5000000) << 1;
 206
 207         setbits32(&fec->fecp->fec_r_cntrl, FEC_RCNTRL_MII_MODE);
 208         setbits32(&fec->fecp->fec_ecntrl, FEC_ECNTRL_PINMUX |
 209                                           FEC_ECNTRL_ETHER_EN);
 210         out_be32(&fec->fecp->fec_ievent, FEC_ENET_MII);
 211         out_be32(&fec->fecp->fec_mii_speed, fec->mii_speed);
 212
 213         new_bus->phy_mask = ~0;
 214         new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
 215         if (!new_bus->irq)
 216                 goto out_unmap_regs;
 217
 218         for (i = 0; i < PHY_MAX_ADDR; i++)
 219                 new_bus->irq[i] = -1;
 220
 221         while ((np = of_get_next_child(ofdev->node, np)))
 222                 if (!strcmp(np->type, "ethernet-phy"))
 223                         add_phy(new_bus, np);
 224
 225         new_bus->dev = &ofdev->dev;
 226         dev_set_drvdata(&ofdev->dev, new_bus);
 227
 228         ret = mdiobus_register(new_bus);
 229         if (ret)
 230                 goto out_free_irqs;
 231
 232         return 0;
 233
 234 out_free_irqs:
 235         dev_set_drvdata(&ofdev->dev, NULL);
 236         kfree(new_bus->irq);
 237 out_unmap_regs:
 238         iounmap(fec->fecp);
 239 out_fec:
 240         kfree(fec);
 241 out_mii:
 242         kfree(new_bus);
 243 out:
 244         return ret;
 245 }
 246
 247 static int fs_enet_mdio_remove(struct of_device *ofdev)
 248 {
 249         struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
 250         struct fec_info *fec = bus->priv;
 251
 252         mdiobus_unregister(bus);
 253         dev_set_drvdata(&ofdev->dev, NULL);
 254         kfree(bus->irq);
 255         iounmap(fec->fecp);
 256         kfree(fec);
 257         kfree(bus);
 258
 259         return 0;
 260 }
 261
 262 static struct of_device_id fs_enet_mdio_fec_match[] = {
 263         {
 264                 .compatible = "fsl,pq1-fec-mdio",
 265         },
 266         {},
 267 };
 268
 269 static struct of_platform_driver fs_enet_fec_mdio_driver = {
 270         .name = "fsl-fec-mdio",
 271         .match_table = fs_enet_mdio_fec_match,
 272         .probe = fs_enet_mdio_probe,
 273         .remove = fs_enet_mdio_remove,
 274 };
 275
 276 static int fs_enet_mdio_fec_init(void)
 277 {
 278         return of_register_platform_driver(&fs_enet_fec_mdio_driver);
 279 }
 280
 281 static void fs_enet_mdio_fec_exit(void)
 282 {
 283         of_unregister_platform_driver(&fs_enet_fec_mdio_driver);
 284 }
 285
 286 module_init(fs_enet_mdio_fec_init);
 287 module_exit(fs_enet_mdio_fec_exit);
 288 #else
 289 static int __devinit fs_enet_fec_mdio_probe(struct device *dev)
 290 {
 291         struct platform_device *pdev = to_platform_device(dev);
 292         struct fs_mii_fec_platform_info *pdata;
 293         struct mii_bus *new_bus;
 294         struct fec_info *fec;
 295         int err = 0;
 296         if (NULL == dev)
 297                 return -EINVAL;
 298         new_bus = kzalloc(sizeof(struct mii_bus), GFP_KERNEL);
 299
 300         if (NULL == new_bus)
 301                 return -ENOMEM;
 302
 303         fec = kzalloc(sizeof(struct fec_info), GFP_KERNEL);
 304
 305         if (NULL == fec)
 306                 return -ENOMEM;
 307
 308         new_bus->name = "FEC MII Bus",
 309         new_bus->read = &fs_enet_fec_mii_read,
 310         new_bus->write = &fs_enet_fec_mii_write,
 311         new_bus->reset = &fs_enet_fec_mii_reset,
 312         new_bus->id = pdev->id;
 313
 314         pdata = (struct fs_mii_fec_platform_info *)pdev->dev.platform_data;
 315
 316         if (NULL == pdata) {
 317                 printk(KERN_ERR "fs_enet FEC mdio %d: Missing platform data!\n", pdev->id);
 318                 return -ENODEV;
 319         }
 320
 321         /*set up workspace*/
 322
 323         fs_mii_fec_init(fec, pdata);
 324         new_bus->priv = fec;
 325
 326         new_bus->irq = pdata->irq;
 327
 328         new_bus->dev = dev;
 329         dev_set_drvdata(dev, new_bus);
 330
 331         err = mdiobus_register(new_bus);
 332
 333         if (0 != err) {
 334                 printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
 335                                 new_bus->name);
 336                 goto bus_register_fail;
 337         }
 338
 339         return 0;
 340
 341 bus_register_fail:
 342         kfree(new_bus);
 343
 344         return err;
 345 }
 346
 347
 348 static int fs_enet_fec_mdio_remove(struct device *dev)
 349 {
 350         struct mii_bus *bus = dev_get_drvdata(dev);
 351
 352         mdiobus_unregister(bus);
 353
 354         dev_set_drvdata(dev, NULL);
 355         kfree(bus->priv);
 356
 357         bus->priv = NULL;
 358         kfree(bus);
 359
 360         return 0;
 361 }
 362
 363 static struct device_driver fs_enet_fec_mdio_driver = {
 364         .name = "fsl-cpm-fec-mdio",
 365         .bus = &platform_bus_type,
 366         .probe = fs_enet_fec_mdio_probe,
 367         .remove = fs_enet_fec_mdio_remove,
 368 };
 369
 370 int fs_enet_mdio_fec_init(void)
 371 {
 372         return driver_register(&fs_enet_fec_mdio_driver);
 373 }
 374
 375 void fs_enet_mdio_fec_exit(void)
 376 {
 377         driver_unregister(&fs_enet_fec_mdio_driver);
 378 }
 379 #endif