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/io.h>
  30
  31 #include <linux/vlynq.h>
  32
  33 #define VLYNQ_CTRL_PM_ENABLE            0x80000000
  34 #define VLYNQ_CTRL_CLOCK_INT            0x00008000
  35 #define VLYNQ_CTRL_CLOCK_DIV(x)         (((x) & 7) << 16)
  36 #define VLYNQ_CTRL_INT_LOCAL            0x00004000
  37 #define VLYNQ_CTRL_INT_ENABLE           0x00002000
  38 #define VLYNQ_CTRL_INT_VECTOR(x)        (((x) & 0x1f) << 8)
  39 #define VLYNQ_CTRL_INT2CFG              0x00000080
  40 #define VLYNQ_CTRL_RESET                0x00000001
  41
  42 #define VLYNQ_INT_OFFSET                0x00000014
  43 #define VLYNQ_REMOTE_OFFSET             0x00000080
  44
  45 #define VLYNQ_STATUS_LINK               0x00000001
  46 #define VLYNQ_STATUS_LERROR             0x00000080
  47 #define VLYNQ_STATUS_RERROR             0x00000100
  48
  49 #define VINT_ENABLE                     0x00000100
  50 #define VINT_TYPE_EDGE                  0x00000080
  51 #define VINT_LEVEL_LOW                  0x00000040
  52 #define VINT_VECTOR(x)                  ((x) & 0x1f)
  53 #define VINT_OFFSET(irq)                (8 * ((irq) % 4))
  54
  55 #define VLYNQ_AUTONEGO_V2               0x00010000
  56
  57 struct vlynq_regs {
  58         u32 revision;
  59         u32 control;
  60         u32 status;
  61         u32 int_prio;
  62         u32 int_status;
  63         u32 int_pending;
  64         u32 int_ptr;
  65         u32 tx_offset;
  66         struct vlynq_mapping rx_mapping[4];
  67         u32 chip;
  68         u32 autonego;
  69         u32 unused[6];
  70         u32 int_device[8];
  71 };
  72
  73 #define vlynq_reg_read(reg) readl(&(reg))
  74 #define vlynq_reg_write(reg, val)  writel(val, &(reg))
  75
  76 static int __vlynq_enable_device(struct vlynq_device *dev);
  77
  78 #ifdef VLYNQ_DEBUG
  79 static void vlynq_dump_regs(struct vlynq_device *dev)
  80 {
  81         int i;
  82         printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
  83                         dev->local, dev->remote);
  84         for (i = 0; i < 32; i++) {
  85                 printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
  86                         i + 1, ((u32 *)dev->local)[i]);
  87                 printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
  88                         i + 1, ((u32 *)dev->remote)[i]);
  89         }
  90 }
  91
  92 static void vlynq_dump_mem(u32 *base, int count)
  93 {
  94         int i;
  95         for (i = 0; i < (count + 3) / 4; i++) {
  96                 if (i % 4 == 0) printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
  97                 printk(KERN_DEBUG " 0x%08x", *(base + i));
  98         }
  99         printk(KERN_DEBUG "\n");
 100 }
 101 #endif
 102
 103 int vlynq_linked(struct vlynq_device *dev)
 104 {
 105         int i;
 106
 107         for (i = 0; i < 100; i++)
 108                 if (vlynq_reg_read(dev->local->status) & VLYNQ_STATUS_LINK)
 109                         return 1;
 110                 else
 111                         cpu_relax();
 112
 113         return 0;
 114 }
 115
 116 static void vlynq_irq_unmask(unsigned int irq)
 117 {
 118         u32 val;
 119         struct vlynq_device *dev = get_irq_chip_data(irq);
 120         int virq;
 121
 122         BUG_ON(!dev);
 123         virq = irq - dev->irq_start;
 124         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 125         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
 126         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 127 }
 128
 129 static void vlynq_irq_mask(unsigned int irq)
 130 {
 131         u32 val;
 132         struct vlynq_device *dev = get_irq_chip_data(irq);
 133         int virq;
 134
 135         BUG_ON(!dev);
 136         virq = irq - dev->irq_start;
 137         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 138         val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
 139         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 140 }
 141
 142 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
 143 {
 144         u32 val;
 145         struct vlynq_device *dev = get_irq_chip_data(irq);
 146         int virq;
 147
 148         BUG_ON(!dev);
 149         virq = irq - dev->irq_start;
 150         val = vlynq_reg_read(dev->remote->int_device[virq >> 2]);
 151         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
 152         case IRQ_TYPE_EDGE_RISING:
 153         case IRQ_TYPE_EDGE_FALLING:
 154         case IRQ_TYPE_EDGE_BOTH:
 155                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
 156                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 157                 break;
 158         case IRQ_TYPE_LEVEL_HIGH:
 159                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 160                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 161                 break;
 162         case IRQ_TYPE_LEVEL_LOW:
 163                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 164                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
 165                 break;
 166         default:
 167                 return -EINVAL;
 168         }
 169         vlynq_reg_write(dev->remote->int_device[virq >> 2], val);
 170         return 0;
 171 }
 172
 173 static void vlynq_local_ack(unsigned int irq)
 174 {
 175         struct vlynq_device *dev = get_irq_chip_data(irq);
 176         u32 status = vlynq_reg_read(dev->local->status);
 177         if (printk_ratelimit())
 178                 printk(KERN_DEBUG "%s: local status: 0x%08x\n",
 179                        dev->dev.bus_id, status);
 180         vlynq_reg_write(dev->local->status, status);
 181 }
 182
 183 static void vlynq_remote_ack(unsigned int irq)
 184 {
 185         struct vlynq_device *dev = get_irq_chip_data(irq);
 186         u32 status = vlynq_reg_read(dev->remote->status);
 187         if (printk_ratelimit())
 188                 printk(KERN_DEBUG "%s: remote status: 0x%08x\n",
 189                        dev->dev.bus_id, status);
 190         vlynq_reg_write(dev->remote->status, status);
 191 }
 192
 193 static irqreturn_t vlynq_irq(int irq, void *dev_id)
 194 {
 195         struct vlynq_device *dev = dev_id;
 196         u32 status;
 197         int virq = 0;
 198
 199         status = vlynq_reg_read(dev->local->int_status);
 200         vlynq_reg_write(dev->local->int_status, status);
 201
 202         if (unlikely(!status))
 203                 spurious_interrupt();
 204
 205         while (status) {
 206                 if (status & 1)
 207                         do_IRQ(dev->irq_start + virq);
 208                 status >>= 1;
 209                 virq++;
 210         }
 211
 212         return IRQ_HANDLED;
 213 }
 214
 215 static struct irq_chip vlynq_irq_chip = {
 216         .name = "vlynq",
 217         .unmask = vlynq_irq_unmask,
 218         .mask = vlynq_irq_mask,
 219         .set_type = vlynq_irq_type,
 220 };
 221
 222 static struct irq_chip vlynq_local_chip = {
 223         .name = "vlynq local error",
 224         .unmask = vlynq_irq_unmask,
 225         .mask = vlynq_irq_mask,
 226         .ack = vlynq_local_ack,
 227 };
 228
 229 static struct irq_chip vlynq_remote_chip = {
 230         .name = "vlynq local error",
 231         .unmask = vlynq_irq_unmask,
 232         .mask = vlynq_irq_mask,
 233         .ack = vlynq_remote_ack,
 234 };
 235
 236 static int vlynq_setup_irq(struct vlynq_device *dev)
 237 {
 238         u32 val;
 239         int i, virq;
 240
 241         if (dev->local_irq == dev->remote_irq) {
 242                 printk(KERN_ERR
 243                        "%s: local vlynq irq should be different from remote\n",
 244                        dev->dev.bus_id);
 245                 return -EINVAL;
 246         }
 247
 248         /* Clear local and remote error bits */
 249         vlynq_reg_write(dev->local->status, vlynq_reg_read(dev->local->status));
 250         vlynq_reg_write(dev->remote->status,
 251                         vlynq_reg_read(dev->remote->status));
 252
 253         /* Now setup interrupts */
 254         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
 255         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
 256                 VLYNQ_CTRL_INT2CFG;
 257         val |= vlynq_reg_read(dev->local->control);
 258         vlynq_reg_write(dev->local->int_ptr, VLYNQ_INT_OFFSET);
 259         vlynq_reg_write(dev->local->control, val);
 260
 261         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
 262         val |= VLYNQ_CTRL_INT_ENABLE;
 263         val |= vlynq_reg_read(dev->remote->control);
 264         vlynq_reg_write(dev->remote->int_ptr, VLYNQ_INT_OFFSET);
 265         vlynq_reg_write(dev->remote->control, val);
 266
 267         for (i = dev->irq_start; i <= dev->irq_end; i++) {
 268                 virq = i - dev->irq_start;
 269                 if (virq == dev->local_irq) {
 270                         set_irq_chip_and_handler(i, &vlynq_local_chip,
 271                                                  handle_level_irq);
 272                         set_irq_chip_data(i, dev);
 273                 } else if (virq == dev->remote_irq) {
 274                         set_irq_chip_and_handler(i, &vlynq_remote_chip,
 275                                                  handle_level_irq);
 276                         set_irq_chip_data(i, dev);
 277                 } else {
 278                         set_irq_chip_and_handler(i, &vlynq_irq_chip,
 279                                                  handle_simple_irq);
 280                         set_irq_chip_data(i, dev);
 281                         vlynq_reg_write(dev->remote->int_device[virq >> 2], 0);
 282                 }
 283         }
 284
 285         if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
 286                 printk(KERN_ERR "%s: request_irq failed\n", dev->dev.bus_id);
 287                 return -EAGAIN;
 288         }
 289
 290         return 0;
 291 }
 292
 293 static void vlynq_device_release(struct device *dev)
 294 {
 295         struct vlynq_device *vdev = to_vlynq_device(dev);
 296         kfree(vdev);
 297 }
 298
 299 static int vlynq_device_match(struct device *dev,
 300                               struct device_driver *drv)
 301 {
 302         struct vlynq_device *vdev = to_vlynq_device(dev);
 303         struct vlynq_driver *vdrv = to_vlynq_driver(drv);
 304         struct plat_vlynq_ops *ops = dev->platform_data;
 305         struct vlynq_device_id *ids = vdrv->id_table;
 306         u32 id = 0;
 307         int result, flag;
 308
 309         while (ids->id) {
 310                 flag = 0;
 311                 if (ids->divisor != vlynq_div_auto
 312                                 && vdev->divisor == vlynq_div_auto) {
 313                         flag = 1;
 314                         vdev->divisor = ids->divisor;
 315                         result = __vlynq_enable_device(vdev);
 316                         if (result == 0) {
 317                                 id = vlynq_reg_read(vdev->remote->chip);
 318                                 vlynq_reg_write(vdev->local->control, 0);
 319                                 vlynq_reg_write(vdev->remote->control, 0);
 320                                 ops->off(vdev);
 321                         } else
 322                                 id = vdev->dev_id;
 323                 } else
 324                         id = vdev->dev_id;
 325                 if (ids->id == id) {
 326                         vdev->dev_id = id;
 327                         vlynq_set_drvdata(vdev, ids);
 328                         printk(KERN_INFO "Driver found for VLYNQ " \
 329                                 "device: %08x\n", id);
 330                         return 1;
 331                 }
 332                 printk(KERN_INFO "Not using the %08x VLYNQ device's " \
 333                         "driver for VLYNQ device: %08x\n", ids->id, id);
 334                 ids++;
 335                 if (flag)
 336                         vdev->divisor = vlynq_div_auto;
 337         }
 338         return 0;
 339 }
 340
 341 static int vlynq_device_probe(struct device *dev)
 342 {
 343         struct vlynq_device *vdev = to_vlynq_device(dev);
 344         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 345         struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
 346         int result = -ENODEV;
 347
 348         get_device(dev);
 349         if (drv && drv->probe)
 350                 result = drv->probe(vdev, id);
 351         if (result)
 352                 put_device(dev);
 353         return result;
 354 }
 355
 356 static int vlynq_device_remove(struct device *dev)
 357 {
 358         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 359         if (drv && drv->remove)
 360                 drv->remove(to_vlynq_device(dev));
 361         put_device(dev);
 362         return 0;
 363 }
 364
 365 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
 366 {
 367         driver->driver.name = driver->name;
 368         driver->driver.bus = &vlynq_bus_type;
 369         return driver_register(&driver->driver);
 370 }
 371 EXPORT_SYMBOL(__vlynq_register_driver);
 372
 373 void vlynq_unregister_driver(struct vlynq_driver *driver)
 374 {
 375         driver_unregister(&driver->driver);
 376 }
 377 EXPORT_SYMBOL(vlynq_unregister_driver);
 378
 379 static int __vlynq_enable_device(struct vlynq_device *dev)
 380 {
 381         int i, result;
 382         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 383
 384         result = ops->on(dev);
 385         if (result)
 386                 return result;
 387
 388         vlynq_reg_write(dev->local->control, 0);
 389         vlynq_reg_write(dev->remote->control, 0);
 390         if (vlynq_linked(dev)) {
 391                 printk(KERN_DEBUG "%s: using external clock\n",
 392                         dev->dev.bus_id);
 393                 return 0;
 394         }
 395
 396         switch (dev->divisor) {
 397         case vlynq_div_auto:
 398                 /* Only try locally supplied clock, others cause problems */
 399                 vlynq_reg_write(dev->local->control, 0);
 400                 vlynq_reg_write(dev->remote->control, 0);
 401                 for (i = vlynq_ldiv2; i <= vlynq_ldiv8; i++) {
 402                         vlynq_reg_write(dev->local->control,
 403                                         VLYNQ_CTRL_CLOCK_INT |
 404                                         VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1));
 405                         if (vlynq_linked(dev)) {
 406                                 printk(KERN_DEBUG
 407                                        "%s: using local clock divisor %d\n",
 408                                        dev->dev.bus_id, i - vlynq_ldiv1 + 1);
 409                                 dev->divisor = i;
 410                                 return 0;
 411                         }
 412                 }
 413         case vlynq_ldiv1: case vlynq_ldiv2: case vlynq_ldiv3: case vlynq_ldiv4:
 414         case vlynq_ldiv5: case vlynq_ldiv6: case vlynq_ldiv7: case vlynq_ldiv8:
 415                 vlynq_reg_write(dev->local->control,
 416                                 VLYNQ_CTRL_CLOCK_INT |
 417                                 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 418                                                      vlynq_ldiv1));
 419                 vlynq_reg_write(dev->remote->control, 0);
 420                 if (vlynq_linked(dev)) {
 421                         printk(KERN_DEBUG
 422                                "%s: using local clock divisor %d\n",
 423                                dev->dev.bus_id, dev->divisor - vlynq_ldiv1 + 1);
 424                         return 0;
 425                 }
 426                 break;
 427         case vlynq_rdiv1: case vlynq_rdiv2: case vlynq_rdiv3: case vlynq_rdiv4:
 428         case vlynq_rdiv5: case vlynq_rdiv6: case vlynq_rdiv7: case vlynq_rdiv8:
 429                 vlynq_reg_write(dev->local->control, 0);
 430                 vlynq_reg_write(dev->remote->control,
 431                                 VLYNQ_CTRL_CLOCK_INT |
 432                                 VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 433                                                      vlynq_rdiv1));
 434                 if (vlynq_linked(dev)) {
 435                         printk(KERN_DEBUG
 436                                "%s: using remote clock divisor %d\n",
 437                                dev->dev.bus_id, dev->divisor - vlynq_rdiv1 + 1);
 438                         return 0;
 439                 }
 440                 break;
 441         }
 442
 443         ops->off(dev);
 444         return -ENODEV;
 445 }
 446
 447 int vlynq_enable_device(struct vlynq_device *dev)
 448 {
 449         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 450         int result = -ENODEV;
 451
 452         result = __vlynq_enable_device(dev);
 453         if (result)
 454                 return result;
 455
 456         result = vlynq_setup_irq(dev);
 457         if (result)
 458                 ops->off(dev);
 459
 460         dev->enabled = !result;
 461         return result;
 462 }
 463 EXPORT_SYMBOL(vlynq_enable_device);
 464
 465
 466 void vlynq_disable_device(struct vlynq_device *dev)
 467 {
 468         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 469
 470         dev->enabled = 0;
 471         free_irq(dev->irq, dev);
 472         ops->off(dev);
 473 }
 474 EXPORT_SYMBOL(vlynq_disable_device);
 475
 476 int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
 477                             struct vlynq_mapping *mapping)
 478 {
 479         int i;
 480
 481         if (!dev->enabled)
 482                 return -ENXIO;
 483
 484         vlynq_reg_write(dev->local->tx_offset, tx_offset);
 485         for (i = 0; i < 4; i++) {
 486                 vlynq_reg_write(dev->local->rx_mapping[i].offset,
 487                                                         mapping[i].offset);
 488                 vlynq_reg_write(dev->local->rx_mapping[i].size,
 489                                                         mapping[i].size);
 490         }
 491         return 0;
 492 }
 493 EXPORT_SYMBOL(vlynq_set_local_mapping);
 494
 495 int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
 496                              struct vlynq_mapping *mapping)
 497 {
 498         int i;
 499
 500         if (!dev->enabled)
 501                 return -ENXIO;
 502
 503         vlynq_reg_write(dev->remote->tx_offset, tx_offset);
 504         for (i = 0; i < 4; i++) {
 505                 vlynq_reg_write(dev->remote->rx_mapping[i].offset,
 506                                                         mapping[i].offset);
 507                 vlynq_reg_write(dev->remote->rx_mapping[i].size,
 508                                                         mapping[i].size);
 509         }
 510         return 0;
 511 }
 512 EXPORT_SYMBOL(vlynq_set_remote_mapping);
 513
 514 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
 515 {
 516         int irq = dev->irq_start + virq;
 517         if (dev->enabled)
 518                 return -EBUSY;
 519
 520         if ((irq < dev->irq_start) || (irq > dev->irq_end))
 521                 return -EINVAL;
 522
 523         if (virq == dev->remote_irq)
 524                 return -EINVAL;
 525
 526         dev->local_irq = virq;
 527
 528         return 0;
 529 }
 530 EXPORT_SYMBOL(vlynq_set_local_irq);
 531
 532 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
 533 {
 534         int irq = dev->irq_start + virq;
 535         if (dev->enabled)
 536                 return -EBUSY;
 537
 538         if ((irq < dev->irq_start) || (irq > dev->irq_end))
 539                 return -EINVAL;
 540
 541         if (virq == dev->local_irq)
 542                 return -EINVAL;
 543
 544         dev->remote_irq = virq;
 545
 546         return 0;
 547 }
 548 EXPORT_SYMBOL(vlynq_set_remote_irq);
 549
 550 static int vlynq_probe(struct platform_device *pdev)
 551 {
 552         struct vlynq_device *dev;
 553         struct resource *regs_res, *mem_res, *irq_res;
 554         int len, result;
 555
 556         regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 557         if (!regs_res)
 558                 return -ENODEV;
 559
 560         mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
 561         if (!mem_res)
 562                 return -ENODEV;
 563
 564         irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
 565         if (!irq_res)
 566                 return -ENODEV;
 567
 568         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 569         if (!dev) {
 570                 printk(KERN_ERR
 571                        "vlynq: failed to allocate device structure\n");
 572                 return -ENOMEM;
 573         }
 574
 575         dev->id = pdev->id;
 576         dev->dev.bus = &vlynq_bus_type;
 577         dev->dev.parent = &pdev->dev;
 578         snprintf(dev->dev.bus_id, BUS_ID_SIZE, "vlynq%d", dev->id);
 579         dev->dev.bus_id[BUS_ID_SIZE - 1] = 0;
 580         dev->dev.platform_data = pdev->dev.platform_data;
 581         dev->dev.release = vlynq_device_release;
 582
 583         dev->regs_start = regs_res->start;
 584         dev->regs_end = regs_res->end;
 585         dev->mem_start = mem_res->start;
 586         dev->mem_end = mem_res->end;
 587
 588         len = regs_res->end - regs_res->start;
 589         if (!request_mem_region(regs_res->start, len, dev->dev.bus_id)) {
 590                 printk(KERN_ERR "%s: Can't request vlynq registers\n",
 591                        dev->dev.bus_id);
 592                 result = -ENXIO;
 593                 goto fail_request;
 594         }
 595
 596         dev->local = ioremap(regs_res->start, len);
 597         if (!dev->local) {
 598                 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
 599                        dev->dev.bus_id);
 600                 result = -ENXIO;
 601                 goto fail_remap;
 602         }
 603
 604         dev->remote = (struct vlynq_regs *)((void *)dev->local +
 605                                             VLYNQ_REMOTE_OFFSET);
 606
 607         dev->irq = platform_get_irq_byname(pdev, "irq");
 608         dev->irq_start = irq_res->start;
 609         dev->irq_end = irq_res->end;
 610         dev->local_irq = dev->irq_end - dev->irq_start;
 611         dev->remote_irq = dev->local_irq - 1;
 612
 613         if (device_register(&dev->dev))
 614                 goto fail_register;
 615         platform_set_drvdata(pdev, dev);
 616
 617         printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
 618                dev->dev.bus_id, (void *)dev->regs_start, dev->irq,
 619                (void *)dev->mem_start);
 620
 621         dev->divisor = vlynq_div_auto;
 622         result = __vlynq_enable_device(dev);
 623         if (result == 0) {
 624                 dev->dev_id = vlynq_reg_read(dev->remote->chip);
 625                 vlynq_reg_write(dev->local->control, 0);
 626                 vlynq_reg_write(dev->remote->control, 0);
 627                 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
 628         } else
 629                 dev->dev_id = 0;
 630         if (dev->dev_id)
 631                 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
 632
 633         return 0;
 634
 635 fail_register:
 636         iounmap(dev->local);
 637 fail_remap:
 638 fail_request:
 639         release_mem_region(regs_res->start, len);
 640         kfree(dev);
 641         return result;
 642 }
 643
 644 static int vlynq_remove(struct platform_device *pdev)
 645 {
 646         struct vlynq_device *dev = platform_get_drvdata(pdev);
 647
 648         device_unregister(&dev->dev);
 649         iounmap(dev->local);
 650         release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
 651
 652         kfree(dev);
 653
 654         return 0;
 655 }
 656
 657 static struct platform_driver vlynq_platform_driver = {
 658         .driver.name = "vlynq",
 659         .probe = vlynq_probe,
 660         .remove = __devexit_p(vlynq_remove),
 661 };
 662
 663 struct bus_type vlynq_bus_type = {
 664         .name = "vlynq",
 665         .match = vlynq_device_match,
 666         .probe = vlynq_device_probe,
 667         .remove = vlynq_device_remove,
 668 };
 669 EXPORT_SYMBOL(vlynq_bus_type);
 670
 671 static int __devinit vlynq_init(void)
 672 {
 673         int res = 0;
 674
 675         res = bus_register(&vlynq_bus_type);
 676         if (res)
 677                 goto fail_bus;
 678
 679         res = platform_driver_register(&vlynq_platform_driver);
 680         if (res)
 681                 goto fail_platform;
 682
 683         return 0;
 684
 685 fail_platform:
 686         bus_unregister(&vlynq_bus_type);
 687 fail_bus:
 688         return res;
 689 }
 690
 691 static void __devexit vlynq_exit(void)
 692 {
 693         platform_driver_unregister(&vlynq_platform_driver);
 694         bus_unregister(&vlynq_bus_type);
 695 }
 696
 697 module_init(vlynq_init);
 698 module_exit(vlynq_exit);