drivers/vlynq/vlynq.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2006, 2007 Eugene Konev <ejka@openwrt.org>
   4  *
   5  * Parts of the VLYNQ specification can be found here:
   6  * http://www.ti.com/litv/pdf/sprue36a
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/string.h>
  13 #include <linux/device.h>
  14 #include <linux/module.h>
  15 #include <linux/errno.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/delay.h>
  19 #include <linux/io.h>
  20 #include <linux/slab.h>
  21 #include <linux/irq.h>
  22
  23 #include <linux/vlynq.h>
  24
  25 #define VLYNQ_CTRL_PM_ENABLE            0x80000000
  26 #define VLYNQ_CTRL_CLOCK_INT            0x00008000
  27 #define VLYNQ_CTRL_CLOCK_DIV(x)         (((x) & 7) << 16)
  28 #define VLYNQ_CTRL_INT_LOCAL            0x00004000
  29 #define VLYNQ_CTRL_INT_ENABLE           0x00002000
  30 #define VLYNQ_CTRL_INT_VECTOR(x)        (((x) & 0x1f) << 8)
  31 #define VLYNQ_CTRL_INT2CFG              0x00000080
  32 #define VLYNQ_CTRL_RESET                0x00000001
  33
  34 #define VLYNQ_CTRL_CLOCK_MASK          (0x7 << 16)
  35
  36 #define VLYNQ_INT_OFFSET                0x00000014
  37 #define VLYNQ_REMOTE_OFFSET             0x00000080
  38
  39 #define VLYNQ_STATUS_LINK               0x00000001
  40 #define VLYNQ_STATUS_LERROR             0x00000080
  41 #define VLYNQ_STATUS_RERROR             0x00000100
  42
  43 #define VINT_ENABLE                     0x00000100
  44 #define VINT_TYPE_EDGE                  0x00000080
  45 #define VINT_LEVEL_LOW                  0x00000040
  46 #define VINT_VECTOR(x)                  ((x) & 0x1f)
  47 #define VINT_OFFSET(irq)                (8 * ((irq) % 4))
  48
  49 #define VLYNQ_AUTONEGO_V2               0x00010000
  50
  51 struct vlynq_regs {
  52         u32 revision;
  53         u32 control;
  54         u32 status;
  55         u32 int_prio;
  56         u32 int_status;
  57         u32 int_pending;
  58         u32 int_ptr;
  59         u32 tx_offset;
  60         struct vlynq_mapping rx_mapping[4];
  61         u32 chip;
  62         u32 autonego;
  63         u32 unused[6];
  64         u32 int_device[8];
  65 };
  66
  67 #ifdef CONFIG_VLYNQ_DEBUG
  68 static void vlynq_dump_regs(struct vlynq_device *dev)
  69 {
  70         int i;
  71
  72         printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n",
  73                         dev->local, dev->remote);
  74         for (i = 0; i < 32; i++) {
  75                 printk(KERN_DEBUG "VLYNQ: local %d: %08x\n",
  76                         i + 1, ((u32 *)dev->local)[i]);
  77                 printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n",
  78                         i + 1, ((u32 *)dev->remote)[i]);
  79         }
  80 }
  81
  82 static void vlynq_dump_mem(u32 *base, int count)
  83 {
  84         int i;
  85
  86         for (i = 0; i < (count + 3) / 4; i++) {
  87                 if (i % 4 == 0)
  88                         printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4);
  89                 printk(KERN_DEBUG " 0x%08x", *(base + i));
  90         }
  91         printk(KERN_DEBUG "\n");
  92 }
  93 #endif
  94
  95 /* Check the VLYNQ link status with a given device */
  96 static int vlynq_linked(struct vlynq_device *dev)
  97 {
  98         int i;
  99
 100         for (i = 0; i < 100; i++)
 101                 if (readl(&dev->local->status) & VLYNQ_STATUS_LINK)
 102                         return 1;
 103                 else
 104                         cpu_relax();
 105
 106         return 0;
 107 }
 108
 109 static void vlynq_reset(struct vlynq_device *dev)
 110 {
 111         writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET,
 112                         &dev->local->control);
 113
 114         /* Wait for the devices to finish resetting */
 115         msleep(5);
 116
 117         /* Remove reset bit */
 118         writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET,
 119                         &dev->local->control);
 120
 121         /* Give some time for the devices to settle */
 122         msleep(5);
 123 }
 124
 125 static void vlynq_irq_unmask(struct irq_data *d)
 126 {
 127         struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
 128         int virq;
 129         u32 val;
 130
 131         BUG_ON(!dev);
 132         virq = d->irq - dev->irq_start;
 133         val = readl(&dev->remote->int_device[virq >> 2]);
 134         val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq);
 135         writel(val, &dev->remote->int_device[virq >> 2]);
 136 }
 137
 138 static void vlynq_irq_mask(struct irq_data *d)
 139 {
 140         struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
 141         int virq;
 142         u32 val;
 143
 144         BUG_ON(!dev);
 145         virq = d->irq - dev->irq_start;
 146         val = readl(&dev->remote->int_device[virq >> 2]);
 147         val &= ~(VINT_ENABLE << VINT_OFFSET(virq));
 148         writel(val, &dev->remote->int_device[virq >> 2]);
 149 }
 150
 151 static int vlynq_irq_type(struct irq_data *d, unsigned int flow_type)
 152 {
 153         struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
 154         int virq;
 155         u32 val;
 156
 157         BUG_ON(!dev);
 158         virq = d->irq - dev->irq_start;
 159         val = readl(&dev->remote->int_device[virq >> 2]);
 160         switch (flow_type & IRQ_TYPE_SENSE_MASK) {
 161         case IRQ_TYPE_EDGE_RISING:
 162         case IRQ_TYPE_EDGE_FALLING:
 163         case IRQ_TYPE_EDGE_BOTH:
 164                 val |= VINT_TYPE_EDGE << VINT_OFFSET(virq);
 165                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 166                 break;
 167         case IRQ_TYPE_LEVEL_HIGH:
 168                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 169                 val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq));
 170                 break;
 171         case IRQ_TYPE_LEVEL_LOW:
 172                 val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq));
 173                 val |= VINT_LEVEL_LOW << VINT_OFFSET(virq);
 174                 break;
 175         default:
 176                 return -EINVAL;
 177         }
 178         writel(val, &dev->remote->int_device[virq >> 2]);
 179         return 0;
 180 }
 181
 182 static void vlynq_local_ack(struct irq_data *d)
 183 {
 184         struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
 185         u32 status = readl(&dev->local->status);
 186
 187         pr_debug("%s: local status: 0x%08x\n",
 188                        dev_name(&dev->dev), status);
 189         writel(status, &dev->local->status);
 190 }
 191
 192 static void vlynq_remote_ack(struct irq_data *d)
 193 {
 194         struct vlynq_device *dev = irq_data_get_irq_chip_data(d);
 195         u32 status = readl(&dev->remote->status);
 196
 197         pr_debug("%s: remote status: 0x%08x\n",
 198                        dev_name(&dev->dev), status);
 199         writel(status, &dev->remote->status);
 200 }
 201
 202 static irqreturn_t vlynq_irq(int irq, void *dev_id)
 203 {
 204         struct vlynq_device *dev = dev_id;
 205         u32 status;
 206         int virq = 0;
 207
 208         status = readl(&dev->local->int_status);
 209         writel(status, &dev->local->int_status);
 210
 211         if (unlikely(!status))
 212                 spurious_interrupt();
 213
 214         while (status) {
 215                 if (status & 1)
 216                         do_IRQ(dev->irq_start + virq);
 217                 status >>= 1;
 218                 virq++;
 219         }
 220
 221         return IRQ_HANDLED;
 222 }
 223
 224 static struct irq_chip vlynq_irq_chip = {
 225         .name = "vlynq",
 226         .irq_unmask = vlynq_irq_unmask,
 227         .irq_mask = vlynq_irq_mask,
 228         .irq_set_type = vlynq_irq_type,
 229 };
 230
 231 static struct irq_chip vlynq_local_chip = {
 232         .name = "vlynq local error",
 233         .irq_unmask = vlynq_irq_unmask,
 234         .irq_mask = vlynq_irq_mask,
 235         .irq_ack = vlynq_local_ack,
 236 };
 237
 238 static struct irq_chip vlynq_remote_chip = {
 239         .name = "vlynq local error",
 240         .irq_unmask = vlynq_irq_unmask,
 241         .irq_mask = vlynq_irq_mask,
 242         .irq_ack = vlynq_remote_ack,
 243 };
 244
 245 static int vlynq_setup_irq(struct vlynq_device *dev)
 246 {
 247         u32 val;
 248         int i, virq;
 249
 250         if (dev->local_irq == dev->remote_irq) {
 251                 printk(KERN_ERR
 252                        "%s: local vlynq irq should be different from remote\n",
 253                        dev_name(&dev->dev));
 254                 return -EINVAL;
 255         }
 256
 257         /* Clear local and remote error bits */
 258         writel(readl(&dev->local->status), &dev->local->status);
 259         writel(readl(&dev->remote->status), &dev->remote->status);
 260
 261         /* Now setup interrupts */
 262         val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq);
 263         val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL |
 264                 VLYNQ_CTRL_INT2CFG;
 265         val |= readl(&dev->local->control);
 266         writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr);
 267         writel(val, &dev->local->control);
 268
 269         val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq);
 270         val |= VLYNQ_CTRL_INT_ENABLE;
 271         val |= readl(&dev->remote->control);
 272         writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr);
 273         writel(val, &dev->remote->int_ptr);
 274         writel(val, &dev->remote->control);
 275
 276         for (i = dev->irq_start; i <= dev->irq_end; i++) {
 277                 virq = i - dev->irq_start;
 278                 if (virq == dev->local_irq) {
 279                         irq_set_chip_and_handler(i, &vlynq_local_chip,
 280                                                  handle_level_irq);
 281                         irq_set_chip_data(i, dev);
 282                 } else if (virq == dev->remote_irq) {
 283                         irq_set_chip_and_handler(i, &vlynq_remote_chip,
 284                                                  handle_level_irq);
 285                         irq_set_chip_data(i, dev);
 286                 } else {
 287                         irq_set_chip_and_handler(i, &vlynq_irq_chip,
 288                                                  handle_simple_irq);
 289                         irq_set_chip_data(i, dev);
 290                         writel(0, &dev->remote->int_device[virq >> 2]);
 291                 }
 292         }
 293
 294         if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) {
 295                 printk(KERN_ERR "%s: request_irq failed\n",
 296                                         dev_name(&dev->dev));
 297                 return -EAGAIN;
 298         }
 299
 300         return 0;
 301 }
 302
 303 static void vlynq_device_release(struct device *dev)
 304 {
 305         struct vlynq_device *vdev = to_vlynq_device(dev);
 306         kfree(vdev);
 307 }
 308
 309 static int vlynq_device_match(struct device *dev,
 310                               struct device_driver *drv)
 311 {
 312         struct vlynq_device *vdev = to_vlynq_device(dev);
 313         struct vlynq_driver *vdrv = to_vlynq_driver(drv);
 314         struct vlynq_device_id *ids = vdrv->id_table;
 315
 316         while (ids->id) {
 317                 if (ids->id == vdev->dev_id) {
 318                         vdev->divisor = ids->divisor;
 319                         vlynq_set_drvdata(vdev, ids);
 320                         printk(KERN_INFO "Driver found for VLYNQ "
 321                                 "device: %08x\n", vdev->dev_id);
 322                         return 1;
 323                 }
 324                 printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver"
 325                         " for VLYNQ device: %08x\n", ids->id, vdev->dev_id);
 326                 ids++;
 327         }
 328         return 0;
 329 }
 330
 331 static int vlynq_device_probe(struct device *dev)
 332 {
 333         struct vlynq_device *vdev = to_vlynq_device(dev);
 334         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 335         struct vlynq_device_id *id = vlynq_get_drvdata(vdev);
 336         int result = -ENODEV;
 337
 338         if (drv->probe)
 339                 result = drv->probe(vdev, id);
 340         if (result)
 341                 put_device(dev);
 342         return result;
 343 }
 344
 345 static void vlynq_device_remove(struct device *dev)
 346 {
 347         struct vlynq_driver *drv = to_vlynq_driver(dev->driver);
 348
 349         if (drv->remove)
 350                 drv->remove(to_vlynq_device(dev));
 351 }
 352
 353 int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner)
 354 {
 355         driver->driver.name = driver->name;
 356         driver->driver.bus = &vlynq_bus_type;
 357         return driver_register(&driver->driver);
 358 }
 359 EXPORT_SYMBOL(__vlynq_register_driver);
 360
 361 void vlynq_unregister_driver(struct vlynq_driver *driver)
 362 {
 363         driver_unregister(&driver->driver);
 364 }
 365 EXPORT_SYMBOL(vlynq_unregister_driver);
 366
 367 /*
 368  * A VLYNQ remote device can clock the VLYNQ bus master
 369  * using a dedicated clock line. In that case, both the
 370  * remove device and the bus master should have the same
 371  * serial clock dividers configured. Iterate through the
 372  * 8 possible dividers until we actually link with the
 373  * device.
 374  */
 375 static int __vlynq_try_remote(struct vlynq_device *dev)
 376 {
 377         int i;
 378
 379         vlynq_reset(dev);
 380         for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ?
 381                         i <= vlynq_rdiv8 : i >= vlynq_rdiv2;
 382                 dev->dev_id ? i++ : i--) {
 383
 384                 if (!vlynq_linked(dev))
 385                         break;
 386
 387                 writel((readl(&dev->remote->control) &
 388                                 ~VLYNQ_CTRL_CLOCK_MASK) |
 389                                 VLYNQ_CTRL_CLOCK_INT |
 390                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
 391                                 &dev->remote->control);
 392                 writel((readl(&dev->local->control)
 393                                 & ~(VLYNQ_CTRL_CLOCK_INT |
 394                                 VLYNQ_CTRL_CLOCK_MASK)) |
 395                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1),
 396                                 &dev->local->control);
 397
 398                 if (vlynq_linked(dev)) {
 399                         printk(KERN_DEBUG
 400                                 "%s: using remote clock divisor %d\n",
 401                                 dev_name(&dev->dev), i - vlynq_rdiv1 + 1);
 402                         dev->divisor = i;
 403                         return 0;
 404                 } else {
 405                         vlynq_reset(dev);
 406                 }
 407         }
 408
 409         return -ENODEV;
 410 }
 411
 412 /*
 413  * A VLYNQ remote device can be clocked by the VLYNQ bus
 414  * master using a dedicated clock line. In that case, only
 415  * the bus master configures the serial clock divider.
 416  * Iterate through the 8 possible dividers until we
 417  * actually get a link with the device.
 418  */
 419 static int __vlynq_try_local(struct vlynq_device *dev)
 420 {
 421         int i;
 422
 423         vlynq_reset(dev);
 424
 425         for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ?
 426                         i <= vlynq_ldiv8 : i >= vlynq_ldiv2;
 427                 dev->dev_id ? i++ : i--) {
 428
 429                 writel((readl(&dev->local->control) &
 430                                 ~VLYNQ_CTRL_CLOCK_MASK) |
 431                                 VLYNQ_CTRL_CLOCK_INT |
 432                                 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1),
 433                                 &dev->local->control);
 434
 435                 if (vlynq_linked(dev)) {
 436                         printk(KERN_DEBUG
 437                                 "%s: using local clock divisor %d\n",
 438                                 dev_name(&dev->dev), i - vlynq_ldiv1 + 1);
 439                         dev->divisor = i;
 440                         return 0;
 441                 } else {
 442                         vlynq_reset(dev);
 443                 }
 444         }
 445
 446         return -ENODEV;
 447 }
 448
 449 /*
 450  * When using external clocking method, serial clock
 451  * is supplied by an external oscillator, therefore we
 452  * should mask the local clock bit in the clock control
 453  * register for both the bus master and the remote device.
 454  */
 455 static int __vlynq_try_external(struct vlynq_device *dev)
 456 {
 457         vlynq_reset(dev);
 458         if (!vlynq_linked(dev))
 459                 return -ENODEV;
 460
 461         writel((readl(&dev->remote->control) &
 462                         ~VLYNQ_CTRL_CLOCK_INT),
 463                         &dev->remote->control);
 464
 465         writel((readl(&dev->local->control) &
 466                         ~VLYNQ_CTRL_CLOCK_INT),
 467                         &dev->local->control);
 468
 469         if (vlynq_linked(dev)) {
 470                 printk(KERN_DEBUG "%s: using external clock\n",
 471                         dev_name(&dev->dev));
 472                         dev->divisor = vlynq_div_external;
 473                 return 0;
 474         }
 475
 476         return -ENODEV;
 477 }
 478
 479 static int __vlynq_enable_device(struct vlynq_device *dev)
 480 {
 481         int result;
 482         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 483
 484         result = ops->on(dev);
 485         if (result)
 486                 return result;
 487
 488         switch (dev->divisor) {
 489         case vlynq_div_external:
 490         case vlynq_div_auto:
 491                 /* When the device is brought from reset it should have clock
 492                  * generation negotiated by hardware.
 493                  * Check which device is generating clocks and perform setup
 494                  * accordingly */
 495                 if (vlynq_linked(dev) && readl(&dev->remote->control) &
 496                    VLYNQ_CTRL_CLOCK_INT) {
 497                         if (!__vlynq_try_remote(dev) ||
 498                                 !__vlynq_try_local(dev)  ||
 499                                 !__vlynq_try_external(dev))
 500                                 return 0;
 501                 } else {
 502                         if (!__vlynq_try_external(dev) ||
 503                                 !__vlynq_try_local(dev)    ||
 504                                 !__vlynq_try_remote(dev))
 505                                 return 0;
 506                 }
 507                 break;
 508         case vlynq_ldiv1:
 509         case vlynq_ldiv2:
 510         case vlynq_ldiv3:
 511         case vlynq_ldiv4:
 512         case vlynq_ldiv5:
 513         case vlynq_ldiv6:
 514         case vlynq_ldiv7:
 515         case vlynq_ldiv8:
 516                 writel(VLYNQ_CTRL_CLOCK_INT |
 517                         VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 518                         vlynq_ldiv1), &dev->local->control);
 519                 writel(0, &dev->remote->control);
 520                 if (vlynq_linked(dev)) {
 521                         printk(KERN_DEBUG
 522                                 "%s: using local clock divisor %d\n",
 523                                 dev_name(&dev->dev),
 524                                 dev->divisor - vlynq_ldiv1 + 1);
 525                         return 0;
 526                 }
 527                 break;
 528         case vlynq_rdiv1:
 529         case vlynq_rdiv2:
 530         case vlynq_rdiv3:
 531         case vlynq_rdiv4:
 532         case vlynq_rdiv5:
 533         case vlynq_rdiv6:
 534         case vlynq_rdiv7:
 535         case vlynq_rdiv8:
 536                 writel(0, &dev->local->control);
 537                 writel(VLYNQ_CTRL_CLOCK_INT |
 538                         VLYNQ_CTRL_CLOCK_DIV(dev->divisor -
 539                         vlynq_rdiv1), &dev->remote->control);
 540                 if (vlynq_linked(dev)) {
 541                         printk(KERN_DEBUG
 542                                 "%s: using remote clock divisor %d\n",
 543                                 dev_name(&dev->dev),
 544                                 dev->divisor - vlynq_rdiv1 + 1);
 545                         return 0;
 546                 }
 547                 break;
 548         }
 549
 550         ops->off(dev);
 551         return -ENODEV;
 552 }
 553
 554 int vlynq_enable_device(struct vlynq_device *dev)
 555 {
 556         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 557         int result = -ENODEV;
 558
 559         result = __vlynq_enable_device(dev);
 560         if (result)
 561                 return result;
 562
 563         result = vlynq_setup_irq(dev);
 564         if (result)
 565                 ops->off(dev);
 566
 567         dev->enabled = !result;
 568         return result;
 569 }
 570 EXPORT_SYMBOL(vlynq_enable_device);
 571
 572
 573 void vlynq_disable_device(struct vlynq_device *dev)
 574 {
 575         struct plat_vlynq_ops *ops = dev->dev.platform_data;
 576
 577         dev->enabled = 0;
 578         free_irq(dev->irq, dev);
 579         ops->off(dev);
 580 }
 581 EXPORT_SYMBOL(vlynq_disable_device);
 582
 583 int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset,
 584                             struct vlynq_mapping *mapping)
 585 {
 586         int i;
 587
 588         if (!dev->enabled)
 589                 return -ENXIO;
 590
 591         writel(tx_offset, &dev->local->tx_offset);
 592         for (i = 0; i < 4; i++) {
 593                 writel(mapping[i].offset, &dev->local->rx_mapping[i].offset);
 594                 writel(mapping[i].size, &dev->local->rx_mapping[i].size);
 595         }
 596         return 0;
 597 }
 598 EXPORT_SYMBOL(vlynq_set_local_mapping);
 599
 600 int vlynq_set_remote_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->remote->tx_offset);
 609         for (i = 0; i < 4; i++) {
 610                 writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset);
 611                 writel(mapping[i].size, &dev->remote->rx_mapping[i].size);
 612         }
 613         return 0;
 614 }
 615 EXPORT_SYMBOL(vlynq_set_remote_mapping);
 616
 617 int vlynq_set_local_irq(struct vlynq_device *dev, int virq)
 618 {
 619         int irq = dev->irq_start + virq;
 620         if (dev->enabled)
 621                 return -EBUSY;
 622
 623         if ((irq < dev->irq_start) || (irq > dev->irq_end))
 624                 return -EINVAL;
 625
 626         if (virq == dev->remote_irq)
 627                 return -EINVAL;
 628
 629         dev->local_irq = virq;
 630
 631         return 0;
 632 }
 633 EXPORT_SYMBOL(vlynq_set_local_irq);
 634
 635 int vlynq_set_remote_irq(struct vlynq_device *dev, int virq)
 636 {
 637         int irq = dev->irq_start + virq;
 638         if (dev->enabled)
 639                 return -EBUSY;
 640
 641         if ((irq < dev->irq_start) || (irq > dev->irq_end))
 642                 return -EINVAL;
 643
 644         if (virq == dev->local_irq)
 645                 return -EINVAL;
 646
 647         dev->remote_irq = virq;
 648
 649         return 0;
 650 }
 651 EXPORT_SYMBOL(vlynq_set_remote_irq);
 652
 653 static int vlynq_probe(struct platform_device *pdev)
 654 {
 655         struct vlynq_device *dev;
 656         struct resource *regs_res, *mem_res, *irq_res;
 657         int len, result;
 658
 659         regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
 660         if (!regs_res)
 661                 return -ENODEV;
 662
 663         mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
 664         if (!mem_res)
 665                 return -ENODEV;
 666
 667         irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq");
 668         if (!irq_res)
 669                 return -ENODEV;
 670
 671         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 672         if (!dev) {
 673                 printk(KERN_ERR
 674                        "vlynq: failed to allocate device structure\n");
 675                 return -ENOMEM;
 676         }
 677
 678         dev->id = pdev->id;
 679         dev->dev.bus = &vlynq_bus_type;
 680         dev->dev.parent = &pdev->dev;
 681         dev_set_name(&dev->dev, "vlynq%d", dev->id);
 682         dev->dev.platform_data = pdev->dev.platform_data;
 683         dev->dev.release = vlynq_device_release;
 684
 685         dev->regs_start = regs_res->start;
 686         dev->regs_end = regs_res->end;
 687         dev->mem_start = mem_res->start;
 688         dev->mem_end = mem_res->end;
 689
 690         len = resource_size(regs_res);
 691         if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) {
 692                 printk(KERN_ERR "%s: Can't request vlynq registers\n",
 693                        dev_name(&dev->dev));
 694                 result = -ENXIO;
 695                 goto fail_request;
 696         }
 697
 698         dev->local = ioremap(regs_res->start, len);
 699         if (!dev->local) {
 700                 printk(KERN_ERR "%s: Can't remap vlynq registers\n",
 701                        dev_name(&dev->dev));
 702                 result = -ENXIO;
 703                 goto fail_remap;
 704         }
 705
 706         dev->remote = (struct vlynq_regs *)((void *)dev->local +
 707                                             VLYNQ_REMOTE_OFFSET);
 708
 709         dev->irq = platform_get_irq_byname(pdev, "irq");
 710         dev->irq_start = irq_res->start;
 711         dev->irq_end = irq_res->end;
 712         dev->local_irq = dev->irq_end - dev->irq_start;
 713         dev->remote_irq = dev->local_irq - 1;
 714
 715         if (device_register(&dev->dev))
 716                 goto fail_register;
 717         platform_set_drvdata(pdev, dev);
 718
 719         printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n",
 720                dev_name(&dev->dev), (void *)dev->regs_start, dev->irq,
 721                (void *)dev->mem_start);
 722
 723         dev->dev_id = 0;
 724         dev->divisor = vlynq_div_auto;
 725         result = __vlynq_enable_device(dev);
 726         if (result == 0) {
 727                 dev->dev_id = readl(&dev->remote->chip);
 728                 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev);
 729         }
 730         if (dev->dev_id)
 731                 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id);
 732
 733         return 0;
 734
 735 fail_register:
 736         iounmap(dev->local);
 737 fail_remap:
 738 fail_request:
 739         release_mem_region(regs_res->start, len);
 740         kfree(dev);
 741         return result;
 742 }
 743
 744 static int vlynq_remove(struct platform_device *pdev)
 745 {
 746         struct vlynq_device *dev = platform_get_drvdata(pdev);
 747
 748         device_unregister(&dev->dev);
 749         iounmap(dev->local);
 750         release_mem_region(dev->regs_start,
 751                            dev->regs_end - dev->regs_start + 1);
 752
 753         kfree(dev);
 754
 755         return 0;
 756 }
 757
 758 static struct platform_driver vlynq_platform_driver = {
 759         .driver.name = "vlynq",
 760         .probe = vlynq_probe,
 761         .remove = vlynq_remove,
 762 };
 763
 764 struct bus_type vlynq_bus_type = {
 765         .name = "vlynq",
 766         .match = vlynq_device_match,
 767         .probe = vlynq_device_probe,
 768         .remove = vlynq_device_remove,
 769 };
 770 EXPORT_SYMBOL(vlynq_bus_type);
 771
 772 static int vlynq_init(void)
 773 {
 774         int res = 0;
 775
 776         res = bus_register(&vlynq_bus_type);
 777         if (res)
 778                 goto fail_bus;
 779
 780         res = platform_driver_register(&vlynq_platform_driver);
 781         if (res)
 782                 goto fail_platform;
 783
 784         return 0;
 785
 786 fail_platform:
 787         bus_unregister(&vlynq_bus_type);
 788 fail_bus:
 789         return res;
 790 }
 791
 792 static void vlynq_exit(void)
 793 {
 794         platform_driver_unregister(&vlynq_platform_driver);
 795         bus_unregister(&vlynq_bus_type);
 796 }
 797
 798 module_init(vlynq_init);
 799 module_exit(vlynq_exit);