linux/drivers/amba/bus.c
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   1/*
   2 *  linux/arch/arm/common/amba.c
   3 *
   4 *  Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10#include <linux/module.h>
  11#include <linux/init.h>
  12#include <linux/device.h>
  13#include <linux/string.h>
  14#include <linux/slab.h>
  15#include <linux/io.h>
  16#include <linux/pm.h>
  17#include <linux/pm_runtime.h>
  18#include <linux/amba/bus.h>
  19#include <linux/sizes.h>
  20
  21#include <asm/irq.h>
  22
  23#define to_amba_driver(d)       container_of(d, struct amba_driver, drv)
  24
  25static const struct amba_id *
  26amba_lookup(const struct amba_id *table, struct amba_device *dev)
  27{
  28        int ret = 0;
  29
  30        while (table->mask) {
  31                ret = (dev->periphid & table->mask) == table->id;
  32                if (ret)
  33                        break;
  34                table++;
  35        }
  36
  37        return ret ? table : NULL;
  38}
  39
  40static int amba_match(struct device *dev, struct device_driver *drv)
  41{
  42        struct amba_device *pcdev = to_amba_device(dev);
  43        struct amba_driver *pcdrv = to_amba_driver(drv);
  44
  45        return amba_lookup(pcdrv->id_table, pcdev) != NULL;
  46}
  47
  48#ifdef CONFIG_HOTPLUG
  49static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
  50{
  51        struct amba_device *pcdev = to_amba_device(dev);
  52        int retval = 0;
  53
  54        retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
  55        if (retval)
  56                return retval;
  57
  58        retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid);
  59        return retval;
  60}
  61#else
  62#define amba_uevent NULL
  63#endif
  64
  65#define amba_attr_func(name,fmt,arg...)                                 \
  66static ssize_t name##_show(struct device *_dev,                         \
  67                           struct device_attribute *attr, char *buf)    \
  68{                                                                       \
  69        struct amba_device *dev = to_amba_device(_dev);                 \
  70        return sprintf(buf, fmt, arg);                                  \
  71}
  72
  73#define amba_attr(name,fmt,arg...)      \
  74amba_attr_func(name,fmt,arg)            \
  75static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
  76
  77amba_attr_func(id, "%08x\n", dev->periphid);
  78amba_attr(irq0, "%u\n", dev->irq[0]);
  79amba_attr(irq1, "%u\n", dev->irq[1]);
  80amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
  81         (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
  82         dev->res.flags);
  83
  84static struct device_attribute amba_dev_attrs[] = {
  85        __ATTR_RO(id),
  86        __ATTR_RO(resource),
  87        __ATTR_NULL,
  88};
  89
  90#ifdef CONFIG_PM_SLEEP
  91
  92static int amba_legacy_suspend(struct device *dev, pm_message_t mesg)
  93{
  94        struct amba_driver *adrv = to_amba_driver(dev->driver);
  95        struct amba_device *adev = to_amba_device(dev);
  96        int ret = 0;
  97
  98        if (dev->driver && adrv->suspend)
  99                ret = adrv->suspend(adev, mesg);
 100
 101        return ret;
 102}
 103
 104static int amba_legacy_resume(struct device *dev)
 105{
 106        struct amba_driver *adrv = to_amba_driver(dev->driver);
 107        struct amba_device *adev = to_amba_device(dev);
 108        int ret = 0;
 109
 110        if (dev->driver && adrv->resume)
 111                ret = adrv->resume(adev);
 112
 113        return ret;
 114}
 115
 116#endif /* CONFIG_PM_SLEEP */
 117
 118#ifdef CONFIG_SUSPEND
 119
 120static int amba_pm_suspend(struct device *dev)
 121{
 122        struct device_driver *drv = dev->driver;
 123        int ret = 0;
 124
 125        if (!drv)
 126                return 0;
 127
 128        if (drv->pm) {
 129                if (drv->pm->suspend)
 130                        ret = drv->pm->suspend(dev);
 131        } else {
 132                ret = amba_legacy_suspend(dev, PMSG_SUSPEND);
 133        }
 134
 135        return ret;
 136}
 137
 138static int amba_pm_resume(struct device *dev)
 139{
 140        struct device_driver *drv = dev->driver;
 141        int ret = 0;
 142
 143        if (!drv)
 144                return 0;
 145
 146        if (drv->pm) {
 147                if (drv->pm->resume)
 148                        ret = drv->pm->resume(dev);
 149        } else {
 150                ret = amba_legacy_resume(dev);
 151        }
 152
 153        return ret;
 154}
 155
 156#else /* !CONFIG_SUSPEND */
 157
 158#define amba_pm_suspend         NULL
 159#define amba_pm_resume          NULL
 160
 161#endif /* !CONFIG_SUSPEND */
 162
 163#ifdef CONFIG_HIBERNATE_CALLBACKS
 164
 165static int amba_pm_freeze(struct device *dev)
 166{
 167        struct device_driver *drv = dev->driver;
 168        int ret = 0;
 169
 170        if (!drv)
 171                return 0;
 172
 173        if (drv->pm) {
 174                if (drv->pm->freeze)
 175                        ret = drv->pm->freeze(dev);
 176        } else {
 177                ret = amba_legacy_suspend(dev, PMSG_FREEZE);
 178        }
 179
 180        return ret;
 181}
 182
 183static int amba_pm_thaw(struct device *dev)
 184{
 185        struct device_driver *drv = dev->driver;
 186        int ret = 0;
 187
 188        if (!drv)
 189                return 0;
 190
 191        if (drv->pm) {
 192                if (drv->pm->thaw)
 193                        ret = drv->pm->thaw(dev);
 194        } else {
 195                ret = amba_legacy_resume(dev);
 196        }
 197
 198        return ret;
 199}
 200
 201static int amba_pm_poweroff(struct device *dev)
 202{
 203        struct device_driver *drv = dev->driver;
 204        int ret = 0;
 205
 206        if (!drv)
 207                return 0;
 208
 209        if (drv->pm) {
 210                if (drv->pm->poweroff)
 211                        ret = drv->pm->poweroff(dev);
 212        } else {
 213                ret = amba_legacy_suspend(dev, PMSG_HIBERNATE);
 214        }
 215
 216        return ret;
 217}
 218
 219static int amba_pm_restore(struct device *dev)
 220{
 221        struct device_driver *drv = dev->driver;
 222        int ret = 0;
 223
 224        if (!drv)
 225                return 0;
 226
 227        if (drv->pm) {
 228                if (drv->pm->restore)
 229                        ret = drv->pm->restore(dev);
 230        } else {
 231                ret = amba_legacy_resume(dev);
 232        }
 233
 234        return ret;
 235}
 236
 237#else /* !CONFIG_HIBERNATE_CALLBACKS */
 238
 239#define amba_pm_freeze          NULL
 240#define amba_pm_thaw            NULL
 241#define amba_pm_poweroff                NULL
 242#define amba_pm_restore         NULL
 243
 244#endif /* !CONFIG_HIBERNATE_CALLBACKS */
 245
 246#ifdef CONFIG_PM_RUNTIME
 247/*
 248 * Hooks to provide runtime PM of the pclk (bus clock).  It is safe to
 249 * enable/disable the bus clock at runtime PM suspend/resume as this
 250 * does not result in loss of context.
 251 */
 252static int amba_pm_runtime_suspend(struct device *dev)
 253{
 254        struct amba_device *pcdev = to_amba_device(dev);
 255        int ret = pm_generic_runtime_suspend(dev);
 256
 257        if (ret == 0 && dev->driver)
 258                clk_disable(pcdev->pclk);
 259
 260        return ret;
 261}
 262
 263static int amba_pm_runtime_resume(struct device *dev)
 264{
 265        struct amba_device *pcdev = to_amba_device(dev);
 266        int ret;
 267
 268        if (dev->driver) {
 269                ret = clk_enable(pcdev->pclk);
 270                /* Failure is probably fatal to the system, but... */
 271                if (ret)
 272                        return ret;
 273        }
 274
 275        return pm_generic_runtime_resume(dev);
 276}
 277#endif
 278
 279#ifdef CONFIG_PM
 280
 281static const struct dev_pm_ops amba_pm = {
 282        .suspend        = amba_pm_suspend,
 283        .resume         = amba_pm_resume,
 284        .freeze         = amba_pm_freeze,
 285        .thaw           = amba_pm_thaw,
 286        .poweroff       = amba_pm_poweroff,
 287        .restore        = amba_pm_restore,
 288        SET_RUNTIME_PM_OPS(
 289                amba_pm_runtime_suspend,
 290                amba_pm_runtime_resume,
 291                pm_generic_runtime_idle
 292        )
 293};
 294
 295#define AMBA_PM (&amba_pm)
 296
 297#else /* !CONFIG_PM */
 298
 299#define AMBA_PM NULL
 300
 301#endif /* !CONFIG_PM */
 302
 303/*
 304 * Primecells are part of the Advanced Microcontroller Bus Architecture,
 305 * so we call the bus "amba".
 306 */
 307struct bus_type amba_bustype = {
 308        .name           = "amba",
 309        .dev_attrs      = amba_dev_attrs,
 310        .match          = amba_match,
 311        .uevent         = amba_uevent,
 312        .pm             = AMBA_PM,
 313};
 314
 315static int __init amba_init(void)
 316{
 317        return bus_register(&amba_bustype);
 318}
 319
 320postcore_initcall(amba_init);
 321
 322static int amba_get_enable_pclk(struct amba_device *pcdev)
 323{
 324        struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
 325        int ret;
 326
 327        pcdev->pclk = pclk;
 328
 329        if (IS_ERR(pclk))
 330                return PTR_ERR(pclk);
 331
 332        ret = clk_prepare(pclk);
 333        if (ret) {
 334                clk_put(pclk);
 335                return ret;
 336        }
 337
 338        ret = clk_enable(pclk);
 339        if (ret) {
 340                clk_unprepare(pclk);
 341                clk_put(pclk);
 342        }
 343
 344        return ret;
 345}
 346
 347static void amba_put_disable_pclk(struct amba_device *pcdev)
 348{
 349        struct clk *pclk = pcdev->pclk;
 350
 351        clk_disable(pclk);
 352        clk_unprepare(pclk);
 353        clk_put(pclk);
 354}
 355
 356/*
 357 * These are the device model conversion veneers; they convert the
 358 * device model structures to our more specific structures.
 359 */
 360static int amba_probe(struct device *dev)
 361{
 362        struct amba_device *pcdev = to_amba_device(dev);
 363        struct amba_driver *pcdrv = to_amba_driver(dev->driver);
 364        const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
 365        int ret;
 366
 367        do {
 368                ret = amba_get_enable_pclk(pcdev);
 369                if (ret)
 370                        break;
 371
 372                pm_runtime_get_noresume(dev);
 373                pm_runtime_set_active(dev);
 374                pm_runtime_enable(dev);
 375
 376                ret = pcdrv->probe(pcdev, id);
 377                if (ret == 0)
 378                        break;
 379
 380                pm_runtime_disable(dev);
 381                pm_runtime_set_suspended(dev);
 382                pm_runtime_put_noidle(dev);
 383
 384                amba_put_disable_pclk(pcdev);
 385        } while (0);
 386
 387        return ret;
 388}
 389
 390static int amba_remove(struct device *dev)
 391{
 392        struct amba_device *pcdev = to_amba_device(dev);
 393        struct amba_driver *drv = to_amba_driver(dev->driver);
 394        int ret;
 395
 396        pm_runtime_get_sync(dev);
 397        ret = drv->remove(pcdev);
 398        pm_runtime_put_noidle(dev);
 399
 400        /* Undo the runtime PM settings in amba_probe() */
 401        pm_runtime_disable(dev);
 402        pm_runtime_set_suspended(dev);
 403        pm_runtime_put_noidle(dev);
 404
 405        amba_put_disable_pclk(pcdev);
 406
 407        return ret;
 408}
 409
 410static void amba_shutdown(struct device *dev)
 411{
 412        struct amba_driver *drv = to_amba_driver(dev->driver);
 413        drv->shutdown(to_amba_device(dev));
 414}
 415
 416/**
 417 *      amba_driver_register - register an AMBA device driver
 418 *      @drv: amba device driver structure
 419 *
 420 *      Register an AMBA device driver with the Linux device model
 421 *      core.  If devices pre-exist, the drivers probe function will
 422 *      be called.
 423 */
 424int amba_driver_register(struct amba_driver *drv)
 425{
 426        drv->drv.bus = &amba_bustype;
 427
 428#define SETFN(fn)       if (drv->fn) drv->drv.fn = amba_##fn
 429        SETFN(probe);
 430        SETFN(remove);
 431        SETFN(shutdown);
 432
 433        return driver_register(&drv->drv);
 434}
 435
 436/**
 437 *      amba_driver_unregister - remove an AMBA device driver
 438 *      @drv: AMBA device driver structure to remove
 439 *
 440 *      Unregister an AMBA device driver from the Linux device
 441 *      model.  The device model will call the drivers remove function
 442 *      for each device the device driver is currently handling.
 443 */
 444void amba_driver_unregister(struct amba_driver *drv)
 445{
 446        driver_unregister(&drv->drv);
 447}
 448
 449
 450static void amba_device_release(struct device *dev)
 451{
 452        struct amba_device *d = to_amba_device(dev);
 453
 454        if (d->res.parent)
 455                release_resource(&d->res);
 456        kfree(d);
 457}
 458
 459/**
 460 *      amba_device_add - add a previously allocated AMBA device structure
 461 *      @dev: AMBA device allocated by amba_device_alloc
 462 *      @parent: resource parent for this devices resources
 463 *
 464 *      Claim the resource, and read the device cell ID if not already
 465 *      initialized.  Register the AMBA device with the Linux device
 466 *      manager.
 467 */
 468int amba_device_add(struct amba_device *dev, struct resource *parent)
 469{
 470        u32 size;
 471        void __iomem *tmp;
 472        int i, ret;
 473
 474        WARN_ON(dev->irq[0] == (unsigned int)-1);
 475        WARN_ON(dev->irq[1] == (unsigned int)-1);
 476
 477        ret = request_resource(parent, &dev->res);
 478        if (ret)
 479                goto err_out;
 480
 481        /* Hard-coded primecell ID instead of plug-n-play */
 482        if (dev->periphid != 0)
 483                goto skip_probe;
 484
 485        /*
 486         * Dynamically calculate the size of the resource
 487         * and use this for iomap
 488         */
 489        size = resource_size(&dev->res);
 490        tmp = ioremap(dev->res.start, size);
 491        if (!tmp) {
 492                ret = -ENOMEM;
 493                goto err_release;
 494        }
 495
 496        ret = amba_get_enable_pclk(dev);
 497        if (ret == 0) {
 498                u32 pid, cid;
 499
 500                /*
 501                 * Read pid and cid based on size of resource
 502                 * they are located at end of region
 503                 */
 504                for (pid = 0, i = 0; i < 4; i++)
 505                        pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
 506                                (i * 8);
 507                for (cid = 0, i = 0; i < 4; i++)
 508                        cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
 509                                (i * 8);
 510
 511                amba_put_disable_pclk(dev);
 512
 513                if (cid == AMBA_CID)
 514                        dev->periphid = pid;
 515
 516                if (!dev->periphid)
 517                        ret = -ENODEV;
 518        }
 519
 520        iounmap(tmp);
 521
 522        if (ret)
 523                goto err_release;
 524
 525 skip_probe:
 526        ret = device_add(&dev->dev);
 527        if (ret)
 528                goto err_release;
 529
 530        if (dev->irq[0])
 531                ret = device_create_file(&dev->dev, &dev_attr_irq0);
 532        if (ret == 0 && dev->irq[1])
 533                ret = device_create_file(&dev->dev, &dev_attr_irq1);
 534        if (ret == 0)
 535                return ret;
 536
 537        device_unregister(&dev->dev);
 538
 539 err_release:
 540        release_resource(&dev->res);
 541 err_out:
 542        return ret;
 543}
 544EXPORT_SYMBOL_GPL(amba_device_add);
 545
 546static struct amba_device *
 547amba_aphb_device_add(struct device *parent, const char *name,
 548                     resource_size_t base, size_t size, int irq1, int irq2,
 549                     void *pdata, unsigned int periphid, u64 dma_mask)
 550{
 551        struct amba_device *dev;
 552        int ret;
 553
 554        dev = amba_device_alloc(name, base, size);
 555        if (!dev)
 556                return ERR_PTR(-ENOMEM);
 557
 558        dev->dma_mask = dma_mask;
 559        dev->dev.coherent_dma_mask = dma_mask;
 560        dev->irq[0] = irq1;
 561        dev->irq[1] = irq2;
 562        dev->periphid = periphid;
 563        dev->dev.platform_data = pdata;
 564        dev->dev.parent = parent;
 565
 566        ret = amba_device_add(dev, &iomem_resource);
 567        if (ret) {
 568                amba_device_put(dev);
 569                return ERR_PTR(ret);
 570        }
 571
 572        return dev;
 573}
 574
 575struct amba_device *
 576amba_apb_device_add(struct device *parent, const char *name,
 577                    resource_size_t base, size_t size, int irq1, int irq2,
 578                    void *pdata, unsigned int periphid)
 579{
 580        return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
 581                                    periphid, 0);
 582}
 583EXPORT_SYMBOL_GPL(amba_apb_device_add);
 584
 585struct amba_device *
 586amba_ahb_device_add(struct device *parent, const char *name,
 587                    resource_size_t base, size_t size, int irq1, int irq2,
 588                    void *pdata, unsigned int periphid)
 589{
 590        return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
 591                                    periphid, ~0ULL);
 592}
 593EXPORT_SYMBOL_GPL(amba_ahb_device_add);
 594
 595static void amba_device_initialize(struct amba_device *dev, const char *name)
 596{
 597        device_initialize(&dev->dev);
 598        if (name)
 599                dev_set_name(&dev->dev, "%s", name);
 600        dev->dev.release = amba_device_release;
 601        dev->dev.bus = &amba_bustype;
 602        dev->dev.dma_mask = &dev->dma_mask;
 603        dev->res.name = dev_name(&dev->dev);
 604}
 605
 606/**
 607 *      amba_device_alloc - allocate an AMBA device
 608 *      @name: sysfs name of the AMBA device
 609 *      @base: base of AMBA device
 610 *      @size: size of AMBA device
 611 *
 612 *      Allocate and initialize an AMBA device structure.  Returns %NULL
 613 *      on failure.
 614 */
 615struct amba_device *amba_device_alloc(const char *name, resource_size_t base,
 616        size_t size)
 617{
 618        struct amba_device *dev;
 619
 620        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 621        if (dev) {
 622                amba_device_initialize(dev, name);
 623                dev->res.start = base;
 624                dev->res.end = base + size - 1;
 625                dev->res.flags = IORESOURCE_MEM;
 626        }
 627
 628        return dev;
 629}
 630EXPORT_SYMBOL_GPL(amba_device_alloc);
 631
 632/**
 633 *      amba_device_register - register an AMBA device
 634 *      @dev: AMBA device to register
 635 *      @parent: parent memory resource
 636 *
 637 *      Setup the AMBA device, reading the cell ID if present.
 638 *      Claim the resource, and register the AMBA device with
 639 *      the Linux device manager.
 640 */
 641int amba_device_register(struct amba_device *dev, struct resource *parent)
 642{
 643        amba_device_initialize(dev, dev->dev.init_name);
 644        dev->dev.init_name = NULL;
 645
 646        if (!dev->dev.coherent_dma_mask && dev->dma_mask)
 647                dev_warn(&dev->dev, "coherent dma mask is unset\n");
 648
 649        return amba_device_add(dev, parent);
 650}
 651
 652/**
 653 *      amba_device_put - put an AMBA device
 654 *      @dev: AMBA device to put
 655 */
 656void amba_device_put(struct amba_device *dev)
 657{
 658        put_device(&dev->dev);
 659}
 660EXPORT_SYMBOL_GPL(amba_device_put);
 661
 662/**
 663 *      amba_device_unregister - unregister an AMBA device
 664 *      @dev: AMBA device to remove
 665 *
 666 *      Remove the specified AMBA device from the Linux device
 667 *      manager.  All files associated with this object will be
 668 *      destroyed, and device drivers notified that the device has
 669 *      been removed.  The AMBA device's resources including
 670 *      the amba_device structure will be freed once all
 671 *      references to it have been dropped.
 672 */
 673void amba_device_unregister(struct amba_device *dev)
 674{
 675        device_unregister(&dev->dev);
 676}
 677
 678
 679struct find_data {
 680        struct amba_device *dev;
 681        struct device *parent;
 682        const char *busid;
 683        unsigned int id;
 684        unsigned int mask;
 685};
 686
 687static int amba_find_match(struct device *dev, void *data)
 688{
 689        struct find_data *d = data;
 690        struct amba_device *pcdev = to_amba_device(dev);
 691        int r;
 692
 693        r = (pcdev->periphid & d->mask) == d->id;
 694        if (d->parent)
 695                r &= d->parent == dev->parent;
 696        if (d->busid)
 697                r &= strcmp(dev_name(dev), d->busid) == 0;
 698
 699        if (r) {
 700                get_device(dev);
 701                d->dev = pcdev;
 702        }
 703
 704        return r;
 705}
 706
 707/**
 708 *      amba_find_device - locate an AMBA device given a bus id
 709 *      @busid: bus id for device (or NULL)
 710 *      @parent: parent device (or NULL)
 711 *      @id: peripheral ID (or 0)
 712 *      @mask: peripheral ID mask (or 0)
 713 *
 714 *      Return the AMBA device corresponding to the supplied parameters.
 715 *      If no device matches, returns NULL.
 716 *
 717 *      NOTE: When a valid device is found, its refcount is
 718 *      incremented, and must be decremented before the returned
 719 *      reference.
 720 */
 721struct amba_device *
 722amba_find_device(const char *busid, struct device *parent, unsigned int id,
 723                 unsigned int mask)
 724{
 725        struct find_data data;
 726
 727        data.dev = NULL;
 728        data.parent = parent;
 729        data.busid = busid;
 730        data.id = id;
 731        data.mask = mask;
 732
 733        bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
 734
 735        return data.dev;
 736}
 737
 738/**
 739 *      amba_request_regions - request all mem regions associated with device
 740 *      @dev: amba_device structure for device
 741 *      @name: name, or NULL to use driver name
 742 */
 743int amba_request_regions(struct amba_device *dev, const char *name)
 744{
 745        int ret = 0;
 746        u32 size;
 747
 748        if (!name)
 749                name = dev->dev.driver->name;
 750
 751        size = resource_size(&dev->res);
 752
 753        if (!request_mem_region(dev->res.start, size, name))
 754                ret = -EBUSY;
 755
 756        return ret;
 757}
 758
 759/**
 760 *      amba_release_regions - release mem regions associated with device
 761 *      @dev: amba_device structure for device
 762 *
 763 *      Release regions claimed by a successful call to amba_request_regions.
 764 */
 765void amba_release_regions(struct amba_device *dev)
 766{
 767        u32 size;
 768
 769        size = resource_size(&dev->res);
 770        release_mem_region(dev->res.start, size);
 771}
 772
 773EXPORT_SYMBOL(amba_driver_register);
 774EXPORT_SYMBOL(amba_driver_unregister);
 775EXPORT_SYMBOL(amba_device_register);
 776EXPORT_SYMBOL(amba_device_unregister);
 777EXPORT_SYMBOL(amba_find_device);
 778EXPORT_SYMBOL(amba_request_regions);
 779EXPORT_SYMBOL(amba_release_regions);
 780
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