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