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); 800