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  * Parts of the VLYNQ specification can be found here:
  19  * http://www.ti.com/litv/pdf/sprue36a
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/types.h>
  24 #include <linux/kernel.h>
  25 #include <linux/string.h>
  26 #include <linux/device.h>
  27 #include <linux/module.h>
  28 #include <linux/errno.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/delay.h>
  32 #include <linux/io.h>
  33 #include <linux/slab.h>
  34 #include <linux/irq.h>
  35
  36 #include <linux/vlynq.h>
  37
  38 #define VLYNQ_CTRL_PM_ENABLE            0x80000000
  39 #define VLYNQ_CTRL_CLOCK_INT            0x00008000
  40 #define VLYNQ_CTRL_CLOCK_DIV(x)         (((x) & 7) << 16)
  41 #define VLYNQ_CTRL_INT_LOCAL            0x00004000
  42 #define VLYNQ_CTRL_INT_ENABLE           0x00002000
  43 #define VLYNQ_CTRL_INT_VECTOR(x)        (((x) & 0x1f) << 8)
  44 #define VLYNQ_CTRL_INT2CFG              0x00000080
  45 #define VLYNQ_CTRL_RESET                0x00000001
  46
  47 #define VLYNQ_CTRL_CLOCK_MASK          (0x7 << 16)
  48
  49 #define VLYNQ_INT_OFFSET                0x00000014
  50 #define VLYNQ_REMOTE_OFFSET             0x00000080
  51
  52 #define VLYNQ_STATUS_LINK               0x00000001
  53 #define VLYNQ_STATUS_LERROR             0x00000080
  54 #define VLYNQ_STATUS_RERROR             0x00000100
  55
  56 #define VINT_ENABLE                     0x00000100
  57 #define VINT_TYPE_EDGE                  0x00000080
  58 #define VINT_LEVEL_LOW                  0x00000040
  59 #define VINT_VECTOR(x)                  ((x) & 0x1f)
  60 #define VINT_OFFSET(irq)                (8 * ((irq) % 4))
  61
  62 #define VLYNQ_AUTONEGO_V2               0x00010000
  63
  64 struct vlynq_regs {
  65         u32 revision;
  66         u32 control;
  67         u32 status;
  68         u32 int_prio;
  69         u32 int_status;
  70         u32 int_pending;
  71         u32 int_ptr;
  72         u32 tx_offset;
  73         struct vlynq_mapping rx_mapping[4];
  74         u32 chip;
  75         u32 autonego;
  76         u32 unused[6];
  77         u32 int_device[8];
  78 };
  79
  80 #ifdef CONFIG_VLYNQ_DEBUG
  81 static void vlynq_dump_regs(struct vlynq_device *dev)
  82 {
  83         int i;
  84
  85         printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
  86                         dev->local, dev->remote);
  87         for (i = 0; i < 32; i++) {
  88                 printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
  89                         i + 1, ((u32 *)dev->local)[i]);
  90                 printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
  91                         i + 1, ((u32 *)dev->remote)[i]);
  92         }
  93 }
  94
  95 static void vlynq_dump_mem(u32 *base, int count)
  96 {
  97         int i;
  98
  99         for (i = 0; i < (count + 3) / 4; i++) {
 100                 if (i % 4 == 0)
 101                         printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
 102                 printk(KERN_DEBUG " 0x%08x", *(base + i));
 103         }
 104         printk(KERN_DEBUG "\n");
 105 }
 106 #endif
 107
 108 /* Check the VLYNQ link status with a given device */
 109 static int vlynq_linked(struct vlynq_device *dev)
 110 {
 111         int i;
 112
 113         for (i = 0; i < 100; i++)
 114                 if (readl(&dev->local->status) & VLYNQ_STATUS_LINK)
 115                         return 1;
 116                 else
 117                         cpu_relax();
 118
 119         return 0;
 120 }
 121
 122 static void vlynq_reset(struct vlynq_device *dev)
 123 {
 124         writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
 125                         &dev->local->control);
 126
 127         /* Wait for the devices to finish resetting */
 128         msleep(5);
 129
 130         /* Remove reset bit */
 131         writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
 132                         &dev->local->control);
 133
 134         /* Give some time for the devices to settle */
 135         msleep(5);
 136 }
 137
 138 static void vlynq_irq_unmask(unsigned int irq)
 139 {
 140         u32 val;
 141         struct vlynq_device *dev = get_irq_chip_data(irq);
 142         int virq;
 143
 144         BUG_ON(!dev);
 145         virq = irq - dev->irq_start;
 146         val = readl(&dev->remote->int_device[virq >> 2]);
 147         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
 148         writel(val, &dev->remote->int_device[virq >> 2]);
 149 }
 150
 151 static void vlynq_irq_mask(unsigned int irq)
 152 {
 153         u32 val;
 154         struct vlynq_device *dev = get_irq_chip_data(irq);
 155         int virq;
 156
 157         BUG_ON(!dev);
 158         virq = irq - dev->irq_start;
 159         val = readl(&dev->remote->int_device[virq >> 2]);
 160         val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
 161         writel(val, &dev->remote->int_device[virq >> 2]);
 162 }
 163
 164 static int vlynq_irq_type(unsigned int irq, unsigned int flow_type)
 165 {
 166         u32 val;
 167         struct vlynq_device *dev = get_irq_chip_data(irq);
 168         int virq;
 169
 170         BUG_ON(!dev);
 171         virq = irq - dev->irq_start;
 172         val = readl(&dev->remote->int_device[virq >> 2]);
 173         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
 174         case IRQ_TYPE_EDGE_RISING:
 175         case IRQ_TYPE_EDGE_FALLING:
 176         case IRQ_TYPE_EDGE_BOTH:
 177                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
 178                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 179                 break;
 180         case IRQ_TYPE_LEVEL_HIGH:
 181                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 182                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 183                 break;
 184         case IRQ_TYPE_LEVEL_LOW:
 185                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 186                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
 187                 break;
 188         default:
 189                 return -EINVAL;
 190         }
 191         writel(val, &dev->remote->int_device[virq >> 2]);
 192         return 0;
 193 }
 194
 195 static void vlynq_local_ack(unsigned int irq)
 196 {
 197         struct vlynq_device *dev = get_irq_chip_data(irq);
 198
 199         u32 status = readl(&dev->local->status);
 200
 201         pr_debug("%s: local status: 0x%08x\n",
 202                        dev_name(&dev->dev), status);
 203         writel(status, &dev->local->status);
 204 }
 205
 206 static void vlynq_remote_ack(unsigned int irq)
 207 {
 208         struct vlynq_device *dev = get_irq_chip_data(irq);
 209
 210         u32 status = readl(&dev->remote->status);
 211
 212         pr_debug("%s: remote status: 0x%08x\n",
 213                        dev_name(&dev->dev), status);
 214         writel(status, &dev->remote->status);
 215 }
 216
 217 static irqreturn_t vlynq_irq(int irq, void *dev_id)
 218 {
 219         struct vlynq_device *dev = dev_id;
 220         u32 status;
 221         int virq = 0;
 222
 223         status = readl(&dev->local->int_status);
 224         writel(status, &dev->local->int_status);
 225
 226         if (unlikely(!status))
 227                 spurious_interrupt();
 228
 229         while (status) {
 230                 if (status & 1)
 231                         do_IRQ(dev->irq_start + virq);
 232                 status >>= 1;
 233                 virq++;
 234         }
 235
 236         return IRQ_HANDLED;
 237 }
 238
 239 static struct irq_chip vlynq_irq_chip = {
 240         .name = "vlynq",
 241         .unmask = vlynq_irq_unmask,
 242         .mask = vlynq_irq_mask,
 243         .set_type = vlynq_irq_type,
 244 };
 245
 246 static struct irq_chip vlynq_local_chip = {
 247         .name = "vlynq local error",
 248         .unmask = vlynq_irq_unmask,
 249         .mask = vlynq_irq_mask,
 250         .ack = vlynq_local_ack,
 251 };
 252
 253 static struct irq_chip vlynq_remote_chip = {
 254         .name = "vlynq local error",
 255         .unmask = vlynq_irq_unmask,
 256         .mask = vlynq_irq_mask,
 257         .ack = vlynq_remote_ack,
 258 };
 259
 260 static int vlynq_setup_irq(struct vlynq_device *dev)
 261 {
 262         u32 val;
 263         int i, virq;
 264
 265         if (dev->local_irq == dev->remote_irq) {
 266                 printk(KERN_ERR
 267                        "%s: local vlynq irq should be different from remote\n",
 268                        dev_name(&dev->dev));
 269                 return -EINVAL;
 270         }
 271
 272         /* Clear local and remote error bits */
 273         writel(readl(&dev->local->status), &dev->local->status);
 274         writel(readl(&dev->remote->status), &dev->remote->status);
 275
 276         /* Now setup interrupts */
 277         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
 278         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
 279                 VLYNQ_CTRL_INT2CFG;
 280         val |= readl(&dev->local->control);
 281         writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr);
 282         writel(val, &dev->local->control);
 283
 284         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
 285         val |= VLYNQ_CTRL_INT_ENABLE;
 286         val |= readl(&dev->remote->control);
 287         writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr);
 288         writel(val, &dev->remote->int_ptr);
 289         writel(val, &dev->remote->control);
 290
 291         for (i = dev->irq_start; i <= dev->irq_end; i++) {
 292                 virq = i - dev->irq_start;
 293                 if (virq == dev->local_irq) {
 294                         set_irq_chip_and_handler(i, &vlynq_local_chip,
 295                                                  handle_level_irq);
 296                         set_irq_chip_data(i, dev);
 297                 } else if (virq == dev->remote_irq) {
 298                         set_irq_chip_and_handler(i, &vlynq_remote_chip,
 299                                                  handle_level_irq);
 300                         set_irq_chip_data(i, dev);
 301                 } else {
 302                         set_irq_chip_and_handler(i, &vlynq_irq_chip,
 303                                                  handle_simple_irq);
 304                         set_irq_chip_data(i, dev);
 305                         writel(0, &dev->remote->int_device[virq >> 2]);
 306                 }
 307         }
 308
 309         if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
 310                 printk(KERN_ERR "%s: request_irq failed\n",
 311                                         dev_name(&dev->dev));
 312                 return -EAGAIN;
 313         }
 314
 315         return 0;
 316 }
 317
 318 static void vlynq_device_release(struct device *dev)
 319 {
 320         struct vlynq_device *vdev = to_vlynq_device(dev);
 321         kfree(vdev);
 322 }
 323
 324 static int vlynq_device_match(struct device *dev,
 325                               struct device_driver *drv)
 326 {
 327         struct vlynq_device *vdev = to_vlynq_device(dev);
 328         struct vlynq_driver *vdrv = to_vlynq_driver(drv);
 329         struct vlynq_device_id *ids = vdrv->id_table;
 330
 331         while (ids->id) {
 332                 if (ids->id == vdev->dev_id) {
 333                         vdev->divisor = ids->divisor;
 334                         vlynq_set_drvdata(vdev, ids);
 335                         printk(KERN_INFO "Driver found for VLYNQ "
 336                                 "device: %08x\n", vdev->dev_id);
 337                         return 1;
 338                 }
 339                 printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver"
 340                         " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
 341                 ids++;
 342         }
 343         return 0;
 344 }
 345
 346 static int vlynq_device_probe(struct device *dev)
 347 {
 348         struct vlynq_device *vdev = to_vlynq_device(dev);
 349         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 350         struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
 351         int result = -ENODEV;
 352
 353         if (drv->probe)
 354                 result = drv->probe(vdev, id);
 355         if (result)
 356                 put_device(dev);
 357         return result;
 358 }
 359
 360 static int vlynq_device_remove(struct device *dev)
 361 {
 362         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 363
 364         if (drv->remove)
 365                 drv->remove(to_vlynq_device(dev));
 366
 367         return 0;
 368 }
 369
 370 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
 371 {
 372         driver->driver.name = driver->name;
 373         driver->driver.bus = &vlynq_bus_type;
 374         return driver_register(&driver->driver);
 375 }
 376 EXPORT_SYMBOL(__vlynq_register_driver);
 377
 378 void vlynq_unregister_driver(struct vlynq_driver *driver)
 379 {
 380         driver_unregister(&driver->driver);
 381 }
 382 EXPORT_SYMBOL(vlynq_unregister_driver);
 383
 384 /*
 385  * A VLYNQ remote device can clock the VLYNQ bus master
 386  * using a dedicated clock line. In that case, both the
 387  * remove device and the bus master should have the same
 388  * serial clock dividers configured. Iterate through the
 389  * 8 possible dividers until we actually link with the
 390  * device.
 391  */
 392 static int __vlynq_try_remote(struct vlynq_device *dev)
 393 {
 394         int i;
 395
 396         vlynq_reset(dev);
 397         for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
 398                         i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
 399                 dev->dev_id ? i++ : i--) {
 400
 401                 if (!vlynq_linked(dev))
 402                         break;
 403
 404                 writel((readl(&dev->remote->control) &
 405                                 ~VLYNQ_CTRL_CLOCK_MASK) |
 406                                 VLYNQ_CTRL_CLOCK_INT |
 407                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
 408                                 &dev->remote->control);
 409                 writel((readl(&dev->local->control)
 410                                 & ~(VLYNQ_CTRL_CLOCK_INT |
 411                                 VLYNQ_CTRL_CLOCK_MASK)) |
 412                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
 413                                 &dev->local->control);
 414
 415                 if (vlynq_linked(dev)) {
 416                         printk(KERN_DEBUG
 417                                 "%s: using remote clock divisor %d\n",
 418                                 dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
 419                         dev->divisor = i;
 420                         return 0;
 421                 } else {
 422                         vlynq_reset(dev);
 423                 }
 424         }
 425
 426         return -ENODEV;
 427 }
 428
 429 /*
 430  * A VLYNQ remote device can be clocked by the VLYNQ bus
 431  * master using a dedicated clock line. In that case, only
 432  * the bus master configures the serial clock divider.
 433  * Iterate through the 8 possible dividers until we
 434  * actually get a link with the device.
 435  */
 436 static int __vlynq_try_local(struct vlynq_device *dev)
 437 {
 438         int i;
 439
 440         vlynq_reset(dev);
 441
 442         for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
 443                         i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
 444                 dev->dev_id ? i++ : i--) {
 445
 446                 writel((readl(&dev->local->control) &
 447                                 ~VLYNQ_CTRL_CLOCK_MASK) |
 448                                 VLYNQ_CTRL_CLOCK_INT |
 449                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
 450                                 &dev->local->control);
 451
 452                 if (vlynq_linked(dev)) {
 453                         printk(KERN_DEBUG
 454                                 "%s: using local clock divisor %d\n",
 455                                 dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
 456                         dev->divisor = i;
 457                         return 0;
 458                 } else {
 459                         vlynq_reset(dev);
 460                 }
 461         }
 462
 463         return -ENODEV;
 464 }
 465
 466 /*
 467  * When using external clocking method, serial clock
 468  * is supplied by an external oscillator, therefore we
 469  * should mask the local clock bit in the clock control
 470  * register for both the bus master and the remote device.
 471  */
 472 static int __vlynq_try_external(struct vlynq_device *dev)
 473 {
 474         vlynq_reset(dev);
 475         if (!vlynq_linked(dev))
 476                 return -ENODEV;
 477
 478         writel((readl(&dev->remote->control) &
 479                         ~VLYNQ_CTRL_CLOCK_INT),
 480                         &dev->remote->control);
 481
 482         writel((readl(&dev->local->control) &
 483                         ~VLYNQ_CTRL_CLOCK_INT),
 484                         &dev->local->control);
 485
 486         if (vlynq_linked(dev)) {
 487                 printk(KERN_DEBUG "%s: using external clock\n",
 488                         dev_name(&dev->dev));
 489                         dev->divisor = vlynq_div_external;
 490                 return 0;
 491         }
 492
 493         return -ENODEV;
 494 }
 495
 496 static int __vlynq_enable_device(struct vlynq_device *dev)
 497 {
 498         int result;
 499         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 500
 501         result = ops->on(dev);
 502         if (result)
 503                 return result;
 504
 505         switch (dev->divisor) {
 506         case vlynq_div_external:
 507         case vlynq_div_auto:
 508                 /* When the device is brought from reset it should have clock
 509                  * generation negotiated by hardware.
 510                  * Check which device is generating clocks and perform setup
 511                  * accordingly */
 512                 if (vlynq_linked(dev) && readl(&dev->remote->control) &
 513                    VLYNQ_CTRL_CLOCK_INT) {
 514                         if (!__vlynq_try_remote(dev) ||
 515                                 !__vlynq_try_local(dev)  ||
 516                                 !__vlynq_try_external(dev))
 517                                 return 0;
 518                 } else {
 519                         if (!__vlynq_try_external(dev) ||
 520                                 !__vlynq_try_local(dev)    ||
 521                                 !__vlynq_try_remote(dev))
 522                                 return 0;
 523                 }
 524                 break;
 525         case vlynq_ldiv1:
 526         case vlynq_ldiv2:
 527         case vlynq_ldiv3:
 528         case vlynq_ldiv4:
 529         case vlynq_ldiv5:
 530         case vlynq_ldiv6:
 531         case vlynq_ldiv7:
 532         case vlynq_ldiv8:
 533                 writel(VLYNQ_CTRL_CLOCK_INT |
 534                         VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 535                         vlynq_ldiv1), &dev->local->control);
 536                 writel(0, &dev->remote->control);
 537                 if (vlynq_linked(dev)) {
 538                         printk(KERN_DEBUG
 539                                 "%s: using local clock divisor %d\n",
 540                                 dev_name(&dev->dev),
 541                                 dev->divisor - vlynq_ldiv1 + 1);
 542                         return 0;
 543                 }
 544                 break;
 545         case vlynq_rdiv1:
 546         case vlynq_rdiv2:
 547         case vlynq_rdiv3:
 548         case vlynq_rdiv4:
 549         case vlynq_rdiv5:
 550         case vlynq_rdiv6:
 551         case vlynq_rdiv7:
 552         case vlynq_rdiv8:
 553                 writel(0, &dev->local->control);
 554                 writel(VLYNQ_CTRL_CLOCK_INT |
 555                         VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 556                         vlynq_rdiv1), &dev->remote->control);
 557                 if (vlynq_linked(dev)) {
 558                         printk(KERN_DEBUG
 559                                 "%s: using remote clock divisor %d\n",
 560                                 dev_name(&dev->dev),
 561                                 dev->divisor - vlynq_rdiv1 + 1);
 562                         return 0;
 563                 }
 564                 break;
 565         }
 566
 567         ops->off(dev);
 568         return -ENODEV;
 569 }
 570
 571 int vlynq_enable_device(struct vlynq_device *dev)
 572 {
 573         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 574         int result = -ENODEV;
 575
 576         result = __vlynq_enable_device(dev);
 577         if (result)
 578                 return result;
 579
 580         result = vlynq_setup_irq(dev);
 581         if (result)
 582                 ops->off(dev);
 583
 584         dev->enabled = !result;
 585         return result;
 586 }
 587 EXPORT_SYMBOL(vlynq_enable_device);
 588
 589
 590 void vlynq_disable_device(struct vlynq_device *dev)
 591 {
 592         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 593
 594         dev->enabled = 0;
 595         free_irq(dev->irq, dev);
 596         ops->off(dev);
 597 }
 598 EXPORT_SYMBOL(vlynq_disable_device);
 599
 600 int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
 601                             struct vlynq_mapping *mapping)
 602 {
 603         int i;
 604
 605         if (!dev->enabled)
 606                 return -ENXIO;
 607
 608         writel(tx_offset, &dev->local->tx_offset);
 609         for (i = 0; i < 4; i++) {
 610                 writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
 611                 writel(mapping[i].size, &dev->local->rx_mapping[i].size);
 612         }
 613         return 0;
 614 }
 615 EXPORT_SYMBOL(vlynq_set_local_mapping);
 616
 617 int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset,
 618                              struct vlynq_mapping *mapping)
 619 {
 620         int i;
 621
 622         if (!dev->enabled)
 623                 return -ENXIO;
 624
 625         writel(tx_offset, &dev->remote->tx_offset);
 626         for (i = 0; i < 4; i++) {
 627                 writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
 628                 writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
 629         }
 630         return 0;
 631 }
 632 EXPORT_SYMBOL(vlynq_set_remote_mapping);
 633
 634 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
 635 {
 636         int irq = dev->irq_start + virq;
 637         if (dev->enabled)
 638                 return -EBUSY;
 639
 640         if ((irq < dev->irq_start) || (irq > dev->irq_end))
 641                 return -EINVAL;
 642
 643         if (virq == dev->remote_irq)
 644                 return -EINVAL;
 645
 646         dev->local_irq = virq;
 647
 648         return 0;
 649 }
 650 EXPORT_SYMBOL(vlynq_set_local_irq);
 651
 652 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
 653 {
 654         int irq = dev->irq_start + virq;
 655         if (dev->enabled)
 656                 return -EBUSY;
 657
 658         if ((irq < dev->irq_start) || (irq > dev->irq_end))
 659                 return -EINVAL;
 660
 661         if (virq == dev->local_irq)
 662                 return -EINVAL;
 663
 664         dev->remote_irq = virq;
 665
 666         return 0;
 667 }
 668 EXPORT_SYMBOL(vlynq_set_remote_irq);
 669
 670 static int vlynq_probe(struct platform_device *pdev)
 671 {
 672         struct vlynq_device *dev;
 673         struct resource *regs_res, *mem_res, *irq_res;
 674         int len, result;
 675
 676         regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 677         if (!regs_res)
 678                 return -ENODEV;
 679
 680         mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
 681         if (!mem_res)
 682                 return -ENODEV;
 683
 684         irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
 685         if (!irq_res)
 686                 return -ENODEV;
 687
 688         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 689         if (!dev) {
 690                 printk(KERN_ERR
 691                        "vlynq: failed to allocate device structure\n");
 692                 return -ENOMEM;
 693         }
 694
 695         dev->id = pdev->id;
 696         dev->dev.bus = &vlynq_bus_type;
 697         dev->dev.parent = &pdev->dev;
 698         dev_set_name(&dev->dev, "vlynq%d", dev->id);
 699         dev->dev.platform_data = pdev->dev.platform_data;
 700         dev->dev.release = vlynq_device_release;
 701
 702         dev->regs_start = regs_res->start;
 703         dev->regs_end = regs_res->end;
 704         dev->mem_start = mem_res->start;
 705         dev->mem_end = mem_res->end;
 706
 707         len = resource_size(regs_res);
 708         if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
 709                 printk(KERN_ERR "%s: Can't request vlynq registers\n",
 710                        dev_name(&dev->dev));
 711                 result = -ENXIO;
 712                 goto fail_request;
 713         }
 714
 715         dev->local = ioremap(regs_res->start, len);
 716         if (!dev->local) {
 717                 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
 718                        dev_name(&dev->dev));
 719                 result = -ENXIO;
 720                 goto fail_remap;
 721         }
 722
 723         dev->remote = (struct vlynq_regs *)((void *)dev->local +
 724                                             VLYNQ_REMOTE_OFFSET);
 725
 726         dev->irq = platform_get_irq_byname(pdev, "irq");
 727         dev->irq_start = irq_res->start;
 728         dev->irq_end = irq_res->end;
 729         dev->local_irq = dev->irq_end - dev->irq_start;
 730         dev->remote_irq = dev->local_irq - 1;
 731
 732         if (device_register(&dev->dev))
 733                 goto fail_register;
 734         platform_set_drvdata(pdev, dev);
 735
 736         printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
 737                dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
 738                (void *)dev->mem_start);
 739
 740         dev->dev_id = 0;
 741         dev->divisor = vlynq_div_auto;
 742         result = __vlynq_enable_device(dev);
 743         if (result == 0) {
 744                 dev->dev_id = readl(&dev->remote->chip);
 745                 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
 746         }
 747         if (dev->dev_id)
 748                 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
 749
 750         return 0;
 751
 752 fail_register:
 753         iounmap(dev->local);
 754 fail_remap:
 755 fail_request:
 756         release_mem_region(regs_res->start, len);
 757         kfree(dev);
 758         return result;
 759 }
 760
 761 static int vlynq_remove(struct platform_device *pdev)
 762 {
 763         struct vlynq_device *dev = platform_get_drvdata(pdev);
 764
 765         device_unregister(&dev->dev);
 766         iounmap(dev->local);
 767         release_mem_region(dev->regs_start, dev->regs_end - dev->regs_start);
 768
 769         kfree(dev);
 770
 771         return 0;
 772 }
 773
 774 static struct platform_driver vlynq_platform_driver = {
 775         .driver.name = "vlynq",
 776         .probe = vlynq_probe,
 777         .remove = __devexit_p(vlynq_remove),
 778 };
 779
 780 struct bus_type vlynq_bus_type = {
 781         .name = "vlynq",
 782         .match = vlynq_device_match,
 783         .probe = vlynq_device_probe,
 784         .remove = vlynq_device_remove,
 785 };
 786 EXPORT_SYMBOL(vlynq_bus_type);
 787
 788 static int __devinit vlynq_init(void)
 789 {
 790         int res = 0;
 791
 792         res = bus_register(&vlynq_bus_type);
 793         if (res)
 794                 goto fail_bus;
 795
 796         res = platform_driver_register(&vlynq_platform_driver);
 797         if (res)
 798                 goto fail_platform;
 799
 800         return 0;
 801
 802 fail_platform:
 803         bus_unregister(&vlynq_bus_type);
 804 fail_bus:
 805         return res;
 806 }
 807
 808 static void __devexit vlynq_exit(void)
 809 {
 810         platform_driver_unregister(&vlynq_platform_driver);
 811         bus_unregister(&vlynq_bus_type);
 812 }
 813
 814 module_init(vlynq_init);
 815 module_exit(vlynq_exit);