drivers/net/fsl_pq_mdio.c

   1 /*
   2  * Freescale PowerQUICC Ethernet Driver -- MIIM bus implementation
   3  * Provides Bus interface for MIIM regs
   4  *
   5  * Author: Andy Fleming <afleming@freescale.com>
   6  * Modifier: Sandeep Gopalpet <sandeep.kumar@freescale.com>
   7  *
   8  * Copyright 2002-2004, 2008-2009 Freescale Semiconductor, Inc.
   9  *
  10  * Based on gianfar_mii.c and ucc_geth_mii.c (Li Yang, Kim Phillips)
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/string.h>
  21 #include <linux/errno.h>
  22 #include <linux/unistd.h>
  23 #include <linux/slab.h>
  24 #include <linux/interrupt.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/mm.h>
  32 #include <linux/module.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/crc32.h>
  35 #include <linux/mii.h>
  36 #include <linux/phy.h>
  37 #include <linux/of.h>
  38 #include <linux/of_address.h>
  39 #include <linux/of_mdio.h>
  40 #include <linux/of_platform.h>
  41
  42 #include <asm/io.h>
  43 #include <asm/irq.h>
  44 #include <asm/uaccess.h>
  45 #include <asm/ucc.h>
  46
  47 #include "gianfar.h"
  48 #include "fsl_pq_mdio.h"
  49
  50 struct fsl_pq_mdio_priv {
  51         void __iomem *map;
  52         struct fsl_pq_mdio __iomem *regs;
  53 };
  54
  55 /*
  56  * Write value to the PHY at mii_id at register regnum,
  57  * on the bus attached to the local interface, which may be different from the
  58  * generic mdio bus (tied to a single interface), waiting until the write is
  59  * done before returning. This is helpful in programming interfaces like
  60  * the TBI which control interfaces like onchip SERDES and are always tied to
  61  * the local mdio pins, which may not be the same as system mdio bus, used for
  62  * controlling the external PHYs, for example.
  63  */
  64 int fsl_pq_local_mdio_write(struct fsl_pq_mdio __iomem *regs, int mii_id,
  65                 int regnum, u16 value)
  66 {
  67         /* Set the PHY address and the register address we want to write */
  68         out_be32(&regs->miimadd, (mii_id << 8) | regnum);
  69
  70         /* Write out the value we want */
  71         out_be32(&regs->miimcon, value);
  72
  73         /* Wait for the transaction to finish */
  74         while (in_be32(&regs->miimind) & MIIMIND_BUSY)
  75                 cpu_relax();
  76
  77         return 0;
  78 }
  79
  80 /*
  81  * Read the bus for PHY at addr mii_id, register regnum, and
  82  * return the value.  Clears miimcom first.  All PHY operation
  83  * done on the bus attached to the local interface,
  84  * which may be different from the generic mdio bus
  85  * This is helpful in programming interfaces like
  86  * the TBI which, in turn, control interfaces like onchip SERDES
  87  * and are always tied to the local mdio pins, which may not be the
  88  * same as system mdio bus, used for controlling the external PHYs, for eg.
  89  */
  90 int fsl_pq_local_mdio_read(struct fsl_pq_mdio __iomem *regs,
  91                 int mii_id, int regnum)
  92 {
  93         u16 value;
  94
  95         /* Set the PHY address and the register address we want to read */
  96         out_be32(&regs->miimadd, (mii_id << 8) | regnum);
  97
  98         /* Clear miimcom, and then initiate a read */
  99         out_be32(&regs->miimcom, 0);
 100         out_be32(&regs->miimcom, MII_READ_COMMAND);
 101
 102         /* Wait for the transaction to finish */
 103         while (in_be32(&regs->miimind) & (MIIMIND_NOTVALID | MIIMIND_BUSY))
 104                 cpu_relax();
 105
 106         /* Grab the value of the register from miimstat */
 107         value = in_be32(&regs->miimstat);
 108
 109         return value;
 110 }
 111
 112 static struct fsl_pq_mdio __iomem *fsl_pq_mdio_get_regs(struct mii_bus *bus)
 113 {
 114         struct fsl_pq_mdio_priv *priv = bus->priv;
 115
 116         return priv->regs;
 117 }
 118
 119 /*
 120  * Write value to the PHY at mii_id at register regnum,
 121  * on the bus, waiting until the write is done before returning.
 122  */
 123 int fsl_pq_mdio_write(struct mii_bus *bus, int mii_id, int regnum, u16 value)
 124 {
 125         struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
 126
 127         /* Write to the local MII regs */
 128         return fsl_pq_local_mdio_write(regs, mii_id, regnum, value);
 129 }
 130
 131 /*
 132  * Read the bus for PHY at addr mii_id, register regnum, and
 133  * return the value.  Clears miimcom first.
 134  */
 135 int fsl_pq_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
 136 {
 137         struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
 138
 139         /* Read the local MII regs */
 140         return fsl_pq_local_mdio_read(regs, mii_id, regnum);
 141 }
 142
 143 /* Reset the MIIM registers, and wait for the bus to free */
 144 static int fsl_pq_mdio_reset(struct mii_bus *bus)
 145 {
 146         struct fsl_pq_mdio __iomem *regs = fsl_pq_mdio_get_regs(bus);
 147         int timeout = PHY_INIT_TIMEOUT;
 148
 149         mutex_lock(&bus->mdio_lock);
 150
 151         /* Reset the management interface */
 152         out_be32(&regs->miimcfg, MIIMCFG_RESET);
 153
 154         /* Setup the MII Mgmt clock speed */
 155         out_be32(&regs->miimcfg, MIIMCFG_INIT_VALUE);
 156
 157         /* Wait until the bus is free */
 158         while ((in_be32(&regs->miimind) & MIIMIND_BUSY) && timeout--)
 159                 cpu_relax();
 160
 161         mutex_unlock(&bus->mdio_lock);
 162
 163         if (timeout < 0) {
 164                 printk(KERN_ERR "%s: The MII Bus is stuck!\n",
 165                                 bus->name);
 166                 return -EBUSY;
 167         }
 168
 169         return 0;
 170 }
 171
 172 void fsl_pq_mdio_bus_name(char *name, struct device_node *np)
 173 {
 174         const u32 *addr;
 175         u64 taddr = OF_BAD_ADDR;
 176
 177         addr = of_get_address(np, 0, NULL, NULL);
 178         if (addr)
 179                 taddr = of_translate_address(np, addr);
 180
 181         snprintf(name, MII_BUS_ID_SIZE, "%s@%llx", np->name,
 182                 (unsigned long long)taddr);
 183 }
 184 EXPORT_SYMBOL_GPL(fsl_pq_mdio_bus_name);
 185
 186 /* Scan the bus in reverse, looking for an empty spot */
 187 static int fsl_pq_mdio_find_free(struct mii_bus *new_bus)
 188 {
 189         int i;
 190
 191         for (i = PHY_MAX_ADDR; i > 0; i--) {
 192                 u32 phy_id;
 193
 194                 if (get_phy_id(new_bus, i, &phy_id))
 195                         return -1;
 196
 197                 if (phy_id == 0xffffffff)
 198                         break;
 199         }
 200
 201         return i;
 202 }
 203
 204
 205 #if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE)
 206 static u32 __iomem *get_gfar_tbipa(struct fsl_pq_mdio __iomem *regs, struct device_node *np)
 207 {
 208         struct gfar __iomem *enet_regs;
 209
 210         /*
 211          * This is mildly evil, but so is our hardware for doing this.
 212          * Also, we have to cast back to struct gfar because of
 213          * definition weirdness done in gianfar.h.
 214          */
 215         if(of_device_is_compatible(np, "fsl,gianfar-mdio") ||
 216                 of_device_is_compatible(np, "fsl,gianfar-tbi") ||
 217                 of_device_is_compatible(np, "gianfar")) {
 218                 enet_regs = (struct gfar __iomem *)regs;
 219                 return &enet_regs->tbipa;
 220         } else if (of_device_is_compatible(np, "fsl,etsec2-mdio") ||
 221                         of_device_is_compatible(np, "fsl,etsec2-tbi")) {
 222                 return of_iomap(np, 1);
 223         } else
 224                 return NULL;
 225 }
 226 #endif
 227
 228
 229 #if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE)
 230 static int get_ucc_id_for_range(u64 start, u64 end, u32 *ucc_id)
 231 {
 232         struct device_node *np = NULL;
 233         int err = 0;
 234
 235         for_each_compatible_node(np, NULL, "ucc_geth") {
 236                 struct resource tempres;
 237
 238                 err = of_address_to_resource(np, 0, &tempres);
 239                 if (err)
 240                         continue;
 241
 242                 /* if our mdio regs fall within this UCC regs range */
 243                 if ((start >= tempres.start) && (end <= tempres.end)) {
 244                         /* Find the id of the UCC */
 245                         const u32 *id;
 246
 247                         id = of_get_property(np, "cell-index", NULL);
 248                         if (!id) {
 249                                 id = of_get_property(np, "device-id", NULL);
 250                                 if (!id)
 251                                         continue;
 252                         }
 253
 254                         *ucc_id = *id;
 255
 256                         return 0;
 257                 }
 258         }
 259
 260         if (err)
 261                 return err;
 262         else
 263                 return -EINVAL;
 264 }
 265 #endif
 266
 267
 268 static int fsl_pq_mdio_probe(struct platform_device *ofdev,
 269                 const struct of_device_id *match)
 270 {
 271         struct device_node *np = ofdev->dev.of_node;
 272         struct device_node *tbi;
 273         struct fsl_pq_mdio_priv *priv;
 274         struct fsl_pq_mdio __iomem *regs = NULL;
 275         void __iomem *map;
 276         u32 __iomem *tbipa;
 277         struct mii_bus *new_bus;
 278         int tbiaddr = -1;
 279         const u32 *addrp;
 280         u64 addr = 0, size = 0;
 281         int err;
 282
 283         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 284         if (!priv)
 285                 return -ENOMEM;
 286
 287         new_bus = mdiobus_alloc();
 288         if (!new_bus) {
 289                 err = -ENOMEM;
 290                 goto err_free_priv;
 291         }
 292
 293         new_bus->name = "Freescale PowerQUICC MII Bus",
 294         new_bus->read = &fsl_pq_mdio_read,
 295         new_bus->write = &fsl_pq_mdio_write,
 296         new_bus->reset = &fsl_pq_mdio_reset,
 297         new_bus->priv = priv;
 298         fsl_pq_mdio_bus_name(new_bus->id, np);
 299
 300         addrp = of_get_address(np, 0, &size, NULL);
 301         if (!addrp) {
 302                 err = -EINVAL;
 303                 goto err_free_bus;
 304         }
 305
 306         /* Set the PHY base address */
 307         addr = of_translate_address(np, addrp);
 308         if (addr == OF_BAD_ADDR) {
 309                 err = -EINVAL;
 310                 goto err_free_bus;
 311         }
 312
 313         map = ioremap(addr, size);
 314         if (!map) {
 315                 err = -ENOMEM;
 316                 goto err_free_bus;
 317         }
 318         priv->map = map;
 319
 320         if (of_device_is_compatible(np, "fsl,gianfar-mdio") ||
 321                         of_device_is_compatible(np, "fsl,gianfar-tbi") ||
 322                         of_device_is_compatible(np, "fsl,ucc-mdio") ||
 323                         of_device_is_compatible(np, "ucc_geth_phy"))
 324                 map -= offsetof(struct fsl_pq_mdio, miimcfg);
 325         regs = map;
 326         priv->regs = regs;
 327
 328         new_bus->irq = kcalloc(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);
 329
 330         if (NULL == new_bus->irq) {
 331                 err = -ENOMEM;
 332                 goto err_unmap_regs;
 333         }
 334
 335         new_bus->parent = &ofdev->dev;
 336         dev_set_drvdata(&ofdev->dev, new_bus);
 337
 338         if (of_device_is_compatible(np, "fsl,gianfar-mdio") ||
 339                         of_device_is_compatible(np, "fsl,gianfar-tbi") ||
 340                         of_device_is_compatible(np, "fsl,etsec2-mdio") ||
 341                         of_device_is_compatible(np, "fsl,etsec2-tbi") ||
 342                         of_device_is_compatible(np, "gianfar")) {
 343 #if defined(CONFIG_GIANFAR) || defined(CONFIG_GIANFAR_MODULE)
 344                 tbipa = get_gfar_tbipa(regs, np);
 345                 if (!tbipa) {
 346                         err = -EINVAL;
 347                         goto err_free_irqs;
 348                 }
 349 #else
 350                 err = -ENODEV;
 351                 goto err_free_irqs;
 352 #endif
 353         } else if (of_device_is_compatible(np, "fsl,ucc-mdio") ||
 354                         of_device_is_compatible(np, "ucc_geth_phy")) {
 355 #if defined(CONFIG_UCC_GETH) || defined(CONFIG_UCC_GETH_MODULE)
 356                 u32 id;
 357                 static u32 mii_mng_master;
 358
 359                 tbipa = &regs->utbipar;
 360
 361                 if ((err = get_ucc_id_for_range(addr, addr + size, &id)))
 362                         goto err_free_irqs;
 363
 364                 if (!mii_mng_master) {
 365                         mii_mng_master = id;
 366                         ucc_set_qe_mux_mii_mng(id - 1);
 367                 }
 368 #else
 369                 err = -ENODEV;
 370                 goto err_free_irqs;
 371 #endif
 372         } else {
 373                 err = -ENODEV;
 374                 goto err_free_irqs;
 375         }
 376
 377         for_each_child_of_node(np, tbi) {
 378                 if (!strncmp(tbi->type, "tbi-phy", 8))
 379                         break;
 380         }
 381
 382         if (tbi) {
 383                 const u32 *prop = of_get_property(tbi, "reg", NULL);
 384
 385                 if (prop)
 386                         tbiaddr = *prop;
 387         }
 388
 389         if (tbiaddr == -1) {
 390                 out_be32(tbipa, 0);
 391
 392                 tbiaddr = fsl_pq_mdio_find_free(new_bus);
 393         }
 394
 395         /*
 396          * We define TBIPA at 0 to be illegal, opting to fail for boards that
 397          * have PHYs at 1-31, rather than change tbipa and rescan.
 398          */
 399         if (tbiaddr == 0) {
 400                 err = -EBUSY;
 401
 402                 goto err_free_irqs;
 403         }
 404
 405         out_be32(tbipa, tbiaddr);
 406
 407         err = of_mdiobus_register(new_bus, np);
 408         if (err) {
 409                 printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
 410                                 new_bus->name);
 411                 goto err_free_irqs;
 412         }
 413
 414         return 0;
 415
 416 err_free_irqs:
 417         kfree(new_bus->irq);
 418 err_unmap_regs:
 419         iounmap(priv->map);
 420 err_free_bus:
 421         kfree(new_bus);
 422 err_free_priv:
 423         kfree(priv);
 424         return err;
 425 }
 426
 427
 428 static int fsl_pq_mdio_remove(struct platform_device *ofdev)
 429 {
 430         struct device *device = &ofdev->dev;
 431         struct mii_bus *bus = dev_get_drvdata(device);
 432         struct fsl_pq_mdio_priv *priv = bus->priv;
 433
 434         mdiobus_unregister(bus);
 435
 436         dev_set_drvdata(device, NULL);
 437
 438         iounmap(priv->map);
 439         bus->priv = NULL;
 440         mdiobus_free(bus);
 441         kfree(priv);
 442
 443         return 0;
 444 }
 445
 446 static struct of_device_id fsl_pq_mdio_match[] = {
 447         {
 448                 .type = "mdio",
 449                 .compatible = "ucc_geth_phy",
 450         },
 451         {
 452                 .type = "mdio",
 453                 .compatible = "gianfar",
 454         },
 455         {
 456                 .compatible = "fsl,ucc-mdio",
 457         },
 458         {
 459                 .compatible = "fsl,gianfar-tbi",
 460         },
 461         {
 462                 .compatible = "fsl,gianfar-mdio",
 463         },
 464         {
 465                 .compatible = "fsl,etsec2-tbi",
 466         },
 467         {
 468                 .compatible = "fsl,etsec2-mdio",
 469         },
 470         {},
 471 };
 472 MODULE_DEVICE_TABLE(of, fsl_pq_mdio_match);
 473
 474 static struct of_platform_driver fsl_pq_mdio_driver = {
 475         .driver = {
 476                 .name = "fsl-pq_mdio",
 477                 .owner = THIS_MODULE,
 478                 .of_match_table = fsl_pq_mdio_match,
 479         },
 480         .probe = fsl_pq_mdio_probe,
 481         .remove = fsl_pq_mdio_remove,
 482 };
 483
 484 int __init fsl_pq_mdio_init(void)
 485 {
 486         return of_register_platform_driver(&fsl_pq_mdio_driver);
 487 }
 488 module_init(fsl_pq_mdio_init);
 489
 490 void fsl_pq_mdio_exit(void)
 491 {
 492         of_unregister_platform_driver(&fsl_pq_mdio_driver);
 493 }
 494 module_exit(fsl_pq_mdio_exit);
 495 MODULE_LICENSE("GPL");