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 51struct 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 68static 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 82static 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 */ 96static 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 109static 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 125static 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 138static 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 151static 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 182static 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 192static 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 202static 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 224static 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 231static 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 238static 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 245static 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 303static void vlynq_device_release(struct device *dev) 304{ 305 struct vlynq_device *vdev = to_vlynq_device(dev); 306 kfree(vdev); 307} 308 309static 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 331static 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 345static int 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 return 0; 353} 354 355int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner) 356{ 357 driver->driver.name = driver->name; 358 driver->driver.bus = &vlynq_bus_type; 359 return driver_register(&driver->driver); 360} 361EXPORT_SYMBOL(__vlynq_register_driver); 362 363void vlynq_unregister_driver(struct vlynq_driver *driver) 364{ 365 driver_unregister(&driver->driver); 366} 367EXPORT_SYMBOL(vlynq_unregister_driver); 368 369/* 370 * A VLYNQ remote device can clock the VLYNQ bus master 371 * using a dedicated clock line. In that case, both the 372 * remove device and the bus master should have the same 373 * serial clock dividers configured. Iterate through the 374 * 8 possible dividers until we actually link with the 375 * device. 376 */ 377static int __vlynq_try_remote(struct vlynq_device *dev) 378{ 379 int i; 380 381 vlynq_reset(dev); 382 for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ? 383 i <= vlynq_rdiv8 : i >= vlynq_rdiv2; 384 dev->dev_id ? i++ : i--) { 385 386 if (!vlynq_linked(dev)) 387 break; 388 389 writel((readl(&dev->remote->control) & 390 ~VLYNQ_CTRL_CLOCK_MASK) | 391 VLYNQ_CTRL_CLOCK_INT | 392 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1), 393 &dev->remote->control); 394 writel((readl(&dev->local->control) 395 & ~(VLYNQ_CTRL_CLOCK_INT | 396 VLYNQ_CTRL_CLOCK_MASK)) | 397 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1), 398 &dev->local->control); 399 400 if (vlynq_linked(dev)) { 401 printk(KERN_DEBUG 402 "%s: using remote clock divisor %d\n", 403 dev_name(&dev->dev), i - vlynq_rdiv1 + 1); 404 dev->divisor = i; 405 return 0; 406 } else { 407 vlynq_reset(dev); 408 } 409 } 410 411 return -ENODEV; 412} 413 414/* 415 * A VLYNQ remote device can be clocked by the VLYNQ bus 416 * master using a dedicated clock line. In that case, only 417 * the bus master configures the serial clock divider. 418 * Iterate through the 8 possible dividers until we 419 * actually get a link with the device. 420 */ 421static int __vlynq_try_local(struct vlynq_device *dev) 422{ 423 int i; 424 425 vlynq_reset(dev); 426 427 for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ? 428 i <= vlynq_ldiv8 : i >= vlynq_ldiv2; 429 dev->dev_id ? i++ : i--) { 430 431 writel((readl(&dev->local->control) & 432 ~VLYNQ_CTRL_CLOCK_MASK) | 433 VLYNQ_CTRL_CLOCK_INT | 434 VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1), 435 &dev->local->control); 436 437 if (vlynq_linked(dev)) { 438 printk(KERN_DEBUG 439 "%s: using local clock divisor %d\n", 440 dev_name(&dev->dev), i - vlynq_ldiv1 + 1); 441 dev->divisor = i; 442 return 0; 443 } else { 444 vlynq_reset(dev); 445 } 446 } 447 448 return -ENODEV; 449} 450 451/* 452 * When using external clocking method, serial clock 453 * is supplied by an external oscillator, therefore we 454 * should mask the local clock bit in the clock control 455 * register for both the bus master and the remote device. 456 */ 457static int __vlynq_try_external(struct vlynq_device *dev) 458{ 459 vlynq_reset(dev); 460 if (!vlynq_linked(dev)) 461 return -ENODEV; 462 463 writel((readl(&dev->remote->control) & 464 ~VLYNQ_CTRL_CLOCK_INT), 465 &dev->remote->control); 466 467 writel((readl(&dev->local->control) & 468 ~VLYNQ_CTRL_CLOCK_INT), 469 &dev->local->control); 470 471 if (vlynq_linked(dev)) { 472 printk(KERN_DEBUG "%s: using external clock\n", 473 dev_name(&dev->dev)); 474 dev->divisor = vlynq_div_external; 475 return 0; 476 } 477 478 return -ENODEV; 479} 480 481static int __vlynq_enable_device(struct vlynq_device *dev) 482{ 483 int result; 484 struct plat_vlynq_ops *ops = dev->dev.platform_data; 485 486 result = ops->on(dev); 487 if (result) 488 return result; 489 490 switch (dev->divisor) { 491 case vlynq_div_external: 492 case vlynq_div_auto: 493 /* When the device is brought from reset it should have clock 494 * generation negotiated by hardware. 495 * Check which device is generating clocks and perform setup 496 * accordingly */ 497 if (vlynq_linked(dev) && readl(&dev->remote->control) & 498 VLYNQ_CTRL_CLOCK_INT) { 499 if (!__vlynq_try_remote(dev) || 500 !__vlynq_try_local(dev) || 501 !__vlynq_try_external(dev)) 502 return 0; 503 } else { 504 if (!__vlynq_try_external(dev) || 505 !__vlynq_try_local(dev) || 506 !__vlynq_try_remote(dev)) 507 return 0; 508 } 509 break; 510 case vlynq_ldiv1: 511 case vlynq_ldiv2: 512 case vlynq_ldiv3: 513 case vlynq_ldiv4: 514 case vlynq_ldiv5: 515 case vlynq_ldiv6: 516 case vlynq_ldiv7: 517 case vlynq_ldiv8: 518 writel(VLYNQ_CTRL_CLOCK_INT | 519 VLYNQ_CTRL_CLOCK_DIV(dev->divisor - 520 vlynq_ldiv1), &dev->local->control); 521 writel(0, &dev->remote->control); 522 if (vlynq_linked(dev)) { 523 printk(KERN_DEBUG 524 "%s: using local clock divisor %d\n", 525 dev_name(&dev->dev), 526 dev->divisor - vlynq_ldiv1 + 1); 527 return 0; 528 } 529 break; 530 case vlynq_rdiv1: 531 case vlynq_rdiv2: 532 case vlynq_rdiv3: 533 case vlynq_rdiv4: 534 case vlynq_rdiv5: 535 case vlynq_rdiv6: 536 case vlynq_rdiv7: 537 case vlynq_rdiv8: 538 writel(0, &dev->local->control); 539 writel(VLYNQ_CTRL_CLOCK_INT | 540 VLYNQ_CTRL_CLOCK_DIV(dev->divisor - 541 vlynq_rdiv1), &dev->remote->control); 542 if (vlynq_linked(dev)) { 543 printk(KERN_DEBUG 544 "%s: using remote clock divisor %d\n", 545 dev_name(&dev->dev), 546 dev->divisor - vlynq_rdiv1 + 1); 547 return 0; 548 } 549 break; 550 } 551 552 ops->off(dev); 553 return -ENODEV; 554} 555 556int vlynq_enable_device(struct vlynq_device *dev) 557{ 558 struct plat_vlynq_ops *ops = dev->dev.platform_data; 559 int result = -ENODEV; 560 561 result = __vlynq_enable_device(dev); 562 if (result) 563 return result; 564 565 result = vlynq_setup_irq(dev); 566 if (result) 567 ops->off(dev); 568 569 dev->enabled = !result; 570 return result; 571} 572EXPORT_SYMBOL(vlynq_enable_device); 573 574 575void vlynq_disable_device(struct vlynq_device *dev) 576{ 577 struct plat_vlynq_ops *ops = dev->dev.platform_data; 578 579 dev->enabled = 0; 580 free_irq(dev->irq, dev); 581 ops->off(dev); 582} 583EXPORT_SYMBOL(vlynq_disable_device); 584 585int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset, 586 struct vlynq_mapping *mapping) 587{ 588 int i; 589 590 if (!dev->enabled) 591 return -ENXIO; 592 593 writel(tx_offset, &dev->local->tx_offset); 594 for (i = 0; i < 4; i++) { 595 writel(mapping[i].offset, &dev->local->rx_mapping[i].offset); 596 writel(mapping[i].size, &dev->local->rx_mapping[i].size); 597 } 598 return 0; 599} 600EXPORT_SYMBOL(vlynq_set_local_mapping); 601 602int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset, 603 struct vlynq_mapping *mapping) 604{ 605 int i; 606 607 if (!dev->enabled) 608 return -ENXIO; 609 610 writel(tx_offset, &dev->remote->tx_offset); 611 for (i = 0; i < 4; i++) { 612 writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset); 613 writel(mapping[i].size, &dev->remote->rx_mapping[i].size); 614 } 615 return 0; 616} 617EXPORT_SYMBOL(vlynq_set_remote_mapping); 618 619int vlynq_set_local_irq(struct vlynq_device *dev, int virq) 620{ 621 int irq = dev->irq_start + virq; 622 if (dev->enabled) 623 return -EBUSY; 624 625 if ((irq < dev->irq_start) || (irq > dev->irq_end)) 626 return -EINVAL; 627 628 if (virq == dev->remote_irq) 629 return -EINVAL; 630 631 dev->local_irq = virq; 632 633 return 0; 634} 635EXPORT_SYMBOL(vlynq_set_local_irq); 636 637int vlynq_set_remote_irq(struct vlynq_device *dev, int virq) 638{ 639 int irq = dev->irq_start + virq; 640 if (dev->enabled) 641 return -EBUSY; 642 643 if ((irq < dev->irq_start) || (irq > dev->irq_end)) 644 return -EINVAL; 645 646 if (virq == dev->local_irq) 647 return -EINVAL; 648 649 dev->remote_irq = virq; 650 651 return 0; 652} 653EXPORT_SYMBOL(vlynq_set_remote_irq); 654 655static int vlynq_probe(struct platform_device *pdev) 656{ 657 struct vlynq_device *dev; 658 struct resource *regs_res, *mem_res, *irq_res; 659 int len, result; 660 661 regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs"); 662 if (!regs_res) 663 return -ENODEV; 664 665 mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem"); 666 if (!mem_res) 667 return -ENODEV; 668 669 irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq"); 670 if (!irq_res) 671 return -ENODEV; 672 673 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 674 if (!dev) { 675 printk(KERN_ERR 676 "vlynq: failed to allocate device structure\n"); 677 return -ENOMEM; 678 } 679 680 dev->id = pdev->id; 681 dev->dev.bus = &vlynq_bus_type; 682 dev->dev.parent = &pdev->dev; 683 dev_set_name(&dev->dev, "vlynq%d", dev->id); 684 dev->dev.platform_data = pdev->dev.platform_data; 685 dev->dev.release = vlynq_device_release; 686 687 dev->regs_start = regs_res->start; 688 dev->regs_end = regs_res->end; 689 dev->mem_start = mem_res->start; 690 dev->mem_end = mem_res->end; 691 692 len = resource_size(regs_res); 693 if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) { 694 printk(KERN_ERR "%s: Can't request vlynq registers\n", 695 dev_name(&dev->dev)); 696 result = -ENXIO; 697 goto fail_request; 698 } 699 700 dev->local = ioremap(regs_res->start, len); 701 if (!dev->local) { 702 printk(KERN_ERR "%s: Can't remap vlynq registers\n", 703 dev_name(&dev->dev)); 704 result = -ENXIO; 705 goto fail_remap; 706 } 707 708 dev->remote = (struct vlynq_regs *)((void *)dev->local + 709 VLYNQ_REMOTE_OFFSET); 710 711 dev->irq = platform_get_irq_byname(pdev, "irq"); 712 dev->irq_start = irq_res->start; 713 dev->irq_end = irq_res->end; 714 dev->local_irq = dev->irq_end - dev->irq_start; 715 dev->remote_irq = dev->local_irq - 1; 716 717 if (device_register(&dev->dev)) 718 goto fail_register; 719 platform_set_drvdata(pdev, dev); 720 721 printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n", 722 dev_name(&dev->dev), (void *)dev->regs_start, dev->irq, 723 (void *)dev->mem_start); 724 725 dev->dev_id = 0; 726 dev->divisor = vlynq_div_auto; 727 result = __vlynq_enable_device(dev); 728 if (result == 0) { 729 dev->dev_id = readl(&dev->remote->chip); 730 ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev); 731 } 732 if (dev->dev_id) 733 printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id); 734 735 return 0; 736 737fail_register: 738 iounmap(dev->local); 739fail_remap: 740fail_request: 741 release_mem_region(regs_res->start, len); 742 kfree(dev); 743 return result; 744} 745 746static int vlynq_remove(struct platform_device *pdev) 747{ 748 struct vlynq_device *dev = platform_get_drvdata(pdev); 749 750 device_unregister(&dev->dev); 751 iounmap(dev->local); 752 release_mem_region(dev->regs_start, 753 dev->regs_end - dev->regs_start + 1); 754 755 kfree(dev); 756 757 return 0; 758} 759 760static struct platform_driver vlynq_platform_driver = { 761 .driver.name = "vlynq", 762 .probe = vlynq_probe, 763 .remove = vlynq_remove, 764}; 765 766struct bus_type vlynq_bus_type = { 767 .name = "vlynq", 768 .match = vlynq_device_match, 769 .probe = vlynq_device_probe, 770 .remove = vlynq_device_remove, 771}; 772EXPORT_SYMBOL(vlynq_bus_type); 773 774static int vlynq_init(void) 775{ 776 int res = 0; 777 778 res = bus_register(&vlynq_bus_type); 779 if (res) 780 goto fail_bus; 781 782 res = platform_driver_register(&vlynq_platform_driver); 783 if (res) 784 goto fail_platform; 785 786 return 0; 787 788fail_platform: 789 bus_unregister(&vlynq_bus_type); 790fail_bus: 791 return res; 792} 793 794static void vlynq_exit(void) 795{ 796 platform_driver_unregister(&vlynq_platform_driver); 797 bus_unregister(&vlynq_bus_type); 798} 799 800module_init(vlynq_init); 801module_exit(vlynq_exit); 802