target/linux/ar7/files/drivers/vlynq/vlynq.c

   1 /*
   2  * Copyright (C) 2006, 2007 Eugene Konev <ejka@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/types.h>
  21 #include <linux/kernel.h>
  22 #include <linux/string.h>
  23 #include <linux/device.h>
  24 #include <linux/module.h>
  25 #include <linux/errno.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/device.h>
  29 #include <linux/delay.h>
  30 #include <linux/io.h>
  31
  32 #include <linux/vlynq.h>
  33
  34 #define VLYNQ_CTRL_PM_ENABLE            0x80000000
  35 #define VLYNQ_CTRL_CLOCK_INT            0x00008000
  36 #define VLYNQ_CTRL_CLOCK_DIV(x)         (((x) & 7) << 16)
  37 #define VLYNQ_CTRL_INT_LOCAL            0x00004000
  38 #define VLYNQ_CTRL_INT_ENABLE           0x00002000
  39 #define VLYNQ_CTRL_INT_VECTOR(x)        (((x) & 0x1f) << 8)
  40 #define VLYNQ_CTRL_INT2CFG              0x00000080
  41 #define VLYNQ_CTRL_RESET                0x00000001
  42
  43 #define VLYNQ_INT_OFFSET                0x00000014
  44 #define VLYNQ_REMOTE_OFFSET             0x00000080
  45
  46 #define VLYNQ_STATUS_LINK               0x00000001
  47 #define VLYNQ_STATUS_LERROR             0x00000080
  48 #define VLYNQ_STATUS_RERROR             0x00000100
  49
  50 #define VINT_ENABLE                     0x00000100
  51 #define VINT_TYPE_EDGE                  0x00000080
  52 #define VINT_LEVEL_LOW                  0x00000040
  53 #define VINT_VECTOR(x)                  ((x) & 0x1f)
  54 #define VINT_OFFSET(irq)                (8 * ((irq) % 4))
  55
  56 #define VLYNQ_AUTONEGO_V2               0x00010000
  57
  58 struct vlynq_regs {
  59         u32 revision;
  60         u32 control;
  61         u32 status;
  62         u32 int_prio;
  63         u32 int_status;
  64         u32 int_pending;
  65         u32 int_ptr;
  66         u32 tx_offset;
  67         struct vlynq_mapping rx_mapping[4];
  68         u32 chip;
  69         u32 autonego;
  70         u32 unused[6];
  71         u32 int_device[8];
  72 };
  73
  74 #define vlynq_reg_read(reg) readl(&(reg))
  75 #define vlynq_reg_write(reg, val)  writel(val, &(reg))
  76
  77 static int __vlynq_enable_device(struct vlynq_device *dev);
  78
  79 #ifdef VLYNQ_DEBUG
  80 static void vlynq_dump_regs(struct vlynq_device *dev)
  81 {
  82         int i;
  83         printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
  84                         dev->local, dev->remote);
  85         for (i = 0; i < 32; i++) {
  86                 printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
  87                         i + 1, ((u32 *)dev->local)[i]);
  88                 printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
  89                         i + 1, ((u32 *)dev->remote)[i]);
  90         }
  91 }
  92
  93 static void vlynq_dump_mem(u32 *base, int count)
  94 {
  95         int i;
  96         for (i = 0; i < (count + 3) / 4; i++) {
  97                 if (i % 4 == 0) printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
  98                 printk(KERN_DEBUG " 0x%08x", *(base + i));
  99         }
 100         printk(KERN_DEBUG "\n");
 101 }
 102 #endif
 103
 104 int vlynq_linked(struct vlynq_device *dev)
 105 {
 106         int i;
 107
 108         for (i = 0; i < 100; i++)
 109                 if (vlynq_reg_read(dev->local->status) & VLYNQ_STATUS_LINK)
 110                         return 1;
 111                 else
 112                         cpu_relax();
 113
 114         return 0;
 115 }
 116
 117 static void vlynq_irq_unmask(unsigned int irq)
 118 {
 119         u32 val;
 120         struct vlynq_device *dev = get_irq_chip_data(irq);
 121         int virq;
 122
 123         BUG_ON(!dev);
 124         virq = irq - dev->irq_start;
 125         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 126         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
 127         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 128 }
 129
 130 static void vlynq_irq_mask(unsigned int irq)
 131 {
 132         u32 val;
 133         struct vlynq_device *dev = get_irq_chip_data(irq);
 134         int virq;
 135
 136         BUG_ON(!dev);
 137         virq = irq - dev->irq_start;
 138         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 139         val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
 140         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 141 }
 142
 143 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
 144 {
 145         u32 val;
 146         struct vlynq_device *dev = get_irq_chip_data(irq);
 147         int virq;
 148
 149         BUG_ON(!dev);
 150         virq = irq - dev->irq_start;
 151         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 152         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
 153         case IRQ_TYPE_EDGE_RISING:
 154         case IRQ_TYPE_EDGE_FALLING:
 155         case IRQ_TYPE_EDGE_BOTH:
 156                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
 157                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 158                 break;
 159         case IRQ_TYPE_LEVEL_HIGH:
 160                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 161                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 162                 break;
 163         case IRQ_TYPE_LEVEL_LOW:
 164                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 165                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
 166                 break;
 167         default:
 168                 return -EINVAL;
 169         }
 170         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 171         return 0;
 172 }
 173
 174 static void vlynq_local_ack(unsigned int irq)
 175 {
 176         struct vlynq_device *dev = get_irq_chip_data(irq);
 177         u32 status = vlynq_reg_read(dev->local->status);
 178         if (printk_ratelimit())
 179                 printk(KERN_DEBUG "%s: local status: 0x%08x\n",
 180                        dev->dev.bus_id, status);
 181         vlynq_reg_write(dev->local->status, status);
 182 }
 183
 184 static void vlynq_remote_ack(unsigned int irq)
 185 {
 186         struct vlynq_device *dev = get_irq_chip_data(irq);
 187         u32 status = vlynq_reg_read(dev->remote->status);
 188         if (printk_ratelimit())
 189                 printk(KERN_DEBUG "%s: remote status: 0x%08x\n",
 190                        dev->dev.bus_id, status);
 191         vlynq_reg_write(dev->remote->status, status);
 192 }
 193
 194 static irqreturn_t vlynq_irq(int irq, void *dev_id)
 195 {
 196         struct vlynq_device *dev = dev_id;
 197         u32 status;
 198         int virq = 0;
 199
 200         status = vlynq_reg_read(dev->local->int_status);
 201         vlynq_reg_write(dev->local->int_status, status);
 202
 203         if (unlikely(!status))
 204                 spurious_interrupt();
 205
 206         while (status) {
 207                 if (status & 1)
 208                         do_IRQ(dev->irq_start + virq);
 209                 status >>= 1;
 210                 virq++;
 211         }
 212
 213         return IRQ_HANDLED;
 214 }
 215
 216 static struct irq_chip vlynq_irq_chip = {
 217         .name = "vlynq",
 218         .unmask = vlynq_irq_unmask,
 219         .mask = vlynq_irq_mask,
 220         .set_type = vlynq_irq_type,
 221 };
 222
 223 static struct irq_chip vlynq_local_chip = {
 224         .name = "vlynq local error",
 225         .unmask = vlynq_irq_unmask,
 226         .mask = vlynq_irq_mask,
 227         .ack = vlynq_local_ack,
 228 };
 229
 230 static struct irq_chip vlynq_remote_chip = {
 231         .name = "vlynq local error",
 232         .unmask = vlynq_irq_unmask,
 233         .mask = vlynq_irq_mask,
 234         .ack = vlynq_remote_ack,
 235 };
 236
 237 static int vlynq_setup_irq(struct vlynq_device *dev)
 238 {
 239         u32 val;
 240         int i, virq;
 241
 242         if (dev->local_irq == dev->remote_irq) {
 243                 printk(KERN_ERR
 244                        "%s: local vlynq irq should be different from remote\n",
 245                        dev->dev.bus_id);
 246                 return -EINVAL;
 247         }
 248
 249         /* Clear local and remote error bits */
 250         vlynq_reg_write(dev->local->status, vlynq_reg_read(dev->local->status));
 251         vlynq_reg_write(dev->remote->status,
 252                         vlynq_reg_read(dev->remote->status));
 253
 254         /* Now setup interrupts */
 255         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
 256         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
 257                 VLYNQ_CTRL_INT2CFG;
 258         val |= vlynq_reg_read(dev->local->control);
 259         vlynq_reg_write(dev->local->int_ptr, VLYNQ_INT_OFFSET);
 260         vlynq_reg_write(dev->local->control, val);
 261
 262         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
 263         val |= VLYNQ_CTRL_INT_ENABLE;
 264         val |= vlynq_reg_read(dev->remote->control);
 265         vlynq_reg_write(dev->remote->int_ptr, VLYNQ_INT_OFFSET);
 266         vlynq_reg_write(dev->remote->control, val);
 267
 268         for (i = dev->irq_start; i <= dev->irq_end; i++) {
 269                 virq = i - dev->irq_start;
 270                 if (virq == dev->local_irq) {
 271                         set_irq_chip_and_handler(i, &vlynq_local_chip,
 272                                                  handle_level_irq);
 273                         set_irq_chip_data(i, dev);
 274                 } else if (virq == dev->remote_irq) {
 275                         set_irq_chip_and_handler(i, &vlynq_remote_chip,
 276                                                  handle_level_irq);
 277                         set_irq_chip_data(i, dev);
 278                 } else {
 279                         set_irq_chip_and_handler(i, &vlynq_irq_chip,
 280                                                  handle_simple_irq);
 281                         set_irq_chip_data(i, dev);
 282                         vlynq_reg_write(dev->remote->int_device[virq >> 2], 0);
 283                 }
 284         }
 285
 286         if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
 287                 printk(KERN_ERR "%s: request_irq failed\n", dev->dev.bus_id);
 288                 return -EAGAIN;
 289         }
 290
 291         return 0;
 292 }
 293
 294 static void vlynq_device_release(struct device *dev)
 295 {
 296         struct vlynq_device *vdev = to_vlynq_device(dev);
 297         kfree(vdev);
 298 }
 299
 300 static int vlynq_device_match(struct device *dev,
 301                               struct device_driver *drv)
 302 {
 303         struct vlynq_device *vdev = to_vlynq_device(dev);
 304         struct vlynq_driver *vdrv = to_vlynq_driver(drv);
 305         struct vlynq_device_id *ids = vdrv->id_table;
 306
 307         while (ids->id) {
 308                 if (ids->id == vdev->dev_id) {
 309                         vdev->divisor = ids->divisor;
 310                         vlynq_set_drvdata(vdev, ids);
 311                         printk(KERN_INFO "Driver found for VLYNQ " \
 312                                 "device: %08x\n", vdev->dev_id);
 313                         return 1;
 314                 }
 315                 printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver" \
 316                         " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
 317                 ids++;
 318         }
 319         return 0;
 320 }
 321
 322 static int vlynq_device_probe(struct device *dev)
 323 {
 324         struct vlynq_device *vdev = to_vlynq_device(dev);
 325         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 326         struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
 327         int result = -ENODEV;
 328
 329         get_device(dev);
 330         if (drv && drv->probe)
 331                 result = drv->probe(vdev, id);
 332         if (result)
 333                 put_device(dev);
 334         return result;
 335 }
 336
 337 static int vlynq_device_remove(struct device *dev)
 338 {
 339         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 340         if (drv && drv->remove)
 341                 drv->remove(to_vlynq_device(dev));
 342         put_device(dev);
 343         return 0;
 344 }
 345
 346 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
 347 {
 348         driver->driver.name = driver->name;
 349         driver->driver.bus = &vlynq_bus_type;
 350         return driver_register(&driver->driver);
 351 }
 352 EXPORT_SYMBOL(__vlynq_register_driver);
 353
 354 void vlynq_unregister_driver(struct vlynq_driver *driver)
 355 {
 356         driver_unregister(&driver->driver);
 357 }
 358 EXPORT_SYMBOL(vlynq_unregister_driver);
 359
 360 static int __vlynq_enable_device(struct vlynq_device *dev)
 361 {
 362         int i, result;
 363         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 364
 365         result = ops->on(dev);
 366         if (result)
 367                 return result;
 368
 369         switch (dev->divisor) {
 370         case vlynq_div_external:
 371         case vlynq_div_auto:
 372                 vlynq_reg_write(dev->local->control, 0);
 373                 vlynq_reg_write(dev->remote->control, 0);
 374                 if (vlynq_linked(dev)) {
 375                         dev->divisor = vlynq_div_external;
 376                         printk(KERN_DEBUG "%s: using external clock\n",
 377                                 dev->dev.bus_id);
 378                         return 0;
 379                 }
 380
 381                 /* Only try locally supplied clock, others cause problems */
 382                 for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
 383                                 i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
 384                                 dev->dev_id ? i++ : i--) {
 385                         vlynq_reg_write(dev->local->control,
 386                                         VLYNQ_CTRL_CLOCK_INT |
 387                                         VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1));
 388                         if (vlynq_linked(dev)) {
 389                                 printk(KERN_DEBUG
 390                                        "%s: using local clock divisor %d\n",
 391                                        dev->dev.bus_id, i - vlynq_ldiv1 + 1);
 392                                 dev->divisor = i;
 393                                 return 0;
 394                         }
 395                 }
 396         case vlynq_ldiv1: case vlynq_ldiv2: case vlynq_ldiv3: case vlynq_ldiv4:
 397         case vlynq_ldiv5: case vlynq_ldiv6: case vlynq_ldiv7: case vlynq_ldiv8:
 398                 vlynq_reg_write(dev->local->control,
 399                                 VLYNQ_CTRL_CLOCK_INT |
 400                                 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 401                                                      vlynq_ldiv1));
 402                 vlynq_reg_write(dev->remote->control, 0);
 403                 if (vlynq_linked(dev)) {
 404                         printk(KERN_DEBUG
 405                                "%s: using local clock divisor %d\n",
 406                                dev->dev.bus_id, dev->divisor - vlynq_ldiv1 + 1);
 407                         return 0;
 408                 }
 409                 break;
 410         case vlynq_rdiv1: case vlynq_rdiv2: case vlynq_rdiv3: case vlynq_rdiv4:
 411         case vlynq_rdiv5: case vlynq_rdiv6: case vlynq_rdiv7: case vlynq_rdiv8:
 412                 vlynq_reg_write(dev->local->control, 0);
 413                 vlynq_reg_write(dev->remote->control,
 414                                 VLYNQ_CTRL_CLOCK_INT |
 415                                 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 416                                                      vlynq_rdiv1));
 417                 if (vlynq_linked(dev)) {
 418                         printk(KERN_DEBUG
 419                                "%s: using remote clock divisor %d\n",
 420                                dev->dev.bus_id, dev->divisor - vlynq_rdiv1 + 1);
 421                         return 0;
 422                 }
 423                 break;
 424         }
 425
 426         ops->off(dev);
 427         return -ENODEV;
 428 }
 429
 430 int vlynq_enable_device(struct vlynq_device *dev)
 431 {
 432         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 433         int result = -ENODEV;
 434
 435         result = __vlynq_enable_device(dev);
 436         if (result)
 437                 return result;
 438
 439         result = vlynq_setup_irq(dev);
 440         if (result)
 441                 ops->off(dev);
 442
 443         dev->enabled = !result;
 444         return result;
 445 }
 446 EXPORT_SYMBOL(vlynq_enable_device);
 447
 448
 449 void vlynq_disable_device(struct vlynq_device *dev)
 450 {
 451         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 452
 453         dev->enabled = 0;
 454         free_irq(dev->irq, dev);
 455         ops->off(dev);
 456 }
 457 EXPORT_SYMBOL(vlynq_disable_device);
 458
 459 int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
 460                             struct vlynq_mapping *mapping)
 461 {
 462         int i;
 463
 464         if (!dev->enabled)
 465                 return -ENXIO;
 466
 467         vlynq_reg_write(dev->local->tx_offset, tx_offset);
 468         for (i = 0; i < 4; i++) {
 469                 vlynq_reg_write(dev->local->rx_mapping[i].offset,
 470                                                         mapping[i].offset);
 471                 vlynq_reg_write(dev->local->rx_mapping[i].size,
 472                                                         mapping[i].size);
 473         }
 474         return 0;
 475 }
 476 EXPORT_SYMBOL(vlynq_set_local_mapping);
 477
 478 int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
 479                              struct vlynq_mapping *mapping)
 480 {
 481         int i;
 482
 483         if (!dev->enabled)
 484                 return -ENXIO;
 485
 486         vlynq_reg_write(dev->remote->tx_offset, tx_offset);
 487         for (i = 0; i < 4; i++) {
 488                 vlynq_reg_write(dev->remote->rx_mapping[i].offset,
 489                                                         mapping[i].offset);
 490                 vlynq_reg_write(dev->remote->rx_mapping[i].size,
 491                                                         mapping[i].size);
 492         }
 493         return 0;
 494 }
 495 EXPORT_SYMBOL(vlynq_set_remote_mapping);
 496
 497 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
 498 {
 499         int irq = dev->irq_start + virq;
 500         if (dev->enabled)
 501                 return -EBUSY;
 502
 503         if ((irq < dev->irq_start) || (irq > dev->irq_end))
 504                 return -EINVAL;
 505
 506         if (virq == dev->remote_irq)
 507                 return -EINVAL;
 508
 509         dev->local_irq = virq;
 510
 511         return 0;
 512 }
 513 EXPORT_SYMBOL(vlynq_set_local_irq);
 514
 515 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
 516 {
 517         int irq = dev->irq_start + virq;
 518         if (dev->enabled)
 519                 return -EBUSY;
 520
 521         if ((irq < dev->irq_start) || (irq > dev->irq_end))
 522                 return -EINVAL;
 523
 524         if (virq == dev->local_irq)
 525                 return -EINVAL;
 526
 527         dev->remote_irq = virq;
 528
 529         return 0;
 530 }
 531 EXPORT_SYMBOL(vlynq_set_remote_irq);
 532
 533 static int vlynq_probe(struct platform_device *pdev)
 534 {
 535         struct vlynq_device *dev;
 536         struct resource *regs_res, *mem_res, *irq_res;
 537         int len, result;
 538
 539         regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 540         if (!regs_res)
 541                 return -ENODEV;
 542
 543         mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
 544         if (!mem_res)
 545                 return -ENODEV;
 546
 547         irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
 548         if (!irq_res)
 549                 return -ENODEV;
 550
 551         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 552         if (!dev) {
 553                 printk(KERN_ERR
 554                        "vlynq: failed to allocate device structure\n");
 555                 return -ENOMEM;
 556         }
 557
 558         dev->id = pdev->id;
 559         dev->dev.bus = &vlynq_bus_type;
 560         dev->dev.parent = &pdev->dev;
 561         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "vlynq%d", dev->id);
 562         dev->dev.bus_id[BUS_ID_SIZE - 1] = 0;
 563         dev->dev.platform_data = pdev->dev.platform_data;
 564         dev->dev.release = vlynq_device_release;
 565
 566         dev->regs_start = regs_res->start;
 567         dev->regs_end = regs_res->end;
 568         dev->mem_start = mem_res->start;
 569         dev->mem_end = mem_res->end;
 570
 571         len = regs_res->end - regs_res->start;
 572         if (!request_mem_region(regs_res->start, len, dev->dev.bus_id)) {
 573                 printk(KERN_ERR "%s: Can't request vlynq registers\n",
 574                        dev->dev.bus_id);
 575                 result = -ENXIO;
 576                 goto fail_request;
 577         }
 578
 579         dev->local = ioremap(regs_res->start, len);
 580         if (!dev->local) {
 581                 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
 582                        dev->dev.bus_id);
 583                 result = -ENXIO;
 584                 goto fail_remap;
 585         }
 586
 587         dev->remote = (struct vlynq_regs *)((void *)dev->local +
 588                                             VLYNQ_REMOTE_OFFSET);
 589
 590         dev->irq = platform_get_irq_byname(pdev, "irq");
 591         dev->irq_start = irq_res->start;
 592         dev->irq_end = irq_res->end;
 593         dev->local_irq = dev->irq_end - dev->irq_start;
 594         dev->remote_irq = dev->local_irq - 1;
 595
 596         if (device_register(&dev->dev))
 597                 goto fail_register;
 598         platform_set_drvdata(pdev, dev);
 599
 600         printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
 601                dev->dev.bus_id, (void *)dev->regs_start, dev->irq,
 602                (void *)dev->mem_start);
 603
 604         dev->dev_id = 0;
 605         dev->divisor = vlynq_div_auto;
 606         result = __vlynq_enable_device(dev);
 607         if (result == 0) {
 608                 dev->dev_id = vlynq_reg_read(dev->remote->chip);
 609                 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
 610         }
 611         if (dev->dev_id)
 612                 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
 613
 614         return 0;
 615
 616 fail_register:
 617         iounmap(dev->local);
 618 fail_remap:
 619 fail_request:
 620         release_mem_region(regs_res->start, len);
 621         kfree(dev);
 622         return result;
 623 }
 624
 625 static int vlynq_remove(struct platform_device *pdev)
 626 {
 627         struct vlynq_device *dev = platform_get_drvdata(pdev);
 628
 629         device_unregister(&dev->dev);
 630         iounmap(dev->local);
 631         release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
 632
 633         kfree(dev);
 634
 635         return 0;
 636 }
 637
 638 static struct platform_driver vlynq_platform_driver = {
 639         .driver.name = "vlynq",
 640         .probe = vlynq_probe,
 641         .remove = __devexit_p(vlynq_remove),
 642 };
 643
 644 struct bus_type vlynq_bus_type = {
 645         .name = "vlynq",
 646         .match = vlynq_device_match,
 647         .probe = vlynq_device_probe,
 648         .remove = vlynq_device_remove,
 649 };
 650 EXPORT_SYMBOL(vlynq_bus_type);
 651
 652 static int __devinit vlynq_init(void)
 653 {
 654         int res = 0;
 655
 656         res = bus_register(&vlynq_bus_type);
 657         if (res)
 658                 goto fail_bus;
 659
 660         res = platform_driver_register(&vlynq_platform_driver);
 661         if (res)
 662                 goto fail_platform;
 663
 664         return 0;
 665
 666 fail_platform:
 667         bus_unregister(&vlynq_bus_type);
 668 fail_bus:
 669         return res;
 670 }
 671
 672 static void __devexit vlynq_exit(void)
 673 {
 674         platform_driver_unregister(&vlynq_platform_driver);
 675         bus_unregister(&vlynq_bus_type);
 676 }
 677
 678 module_init(vlynq_init);
 679 module_exit(vlynq_exit);