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
  48static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
  49{
  50        struct amba_device *pcdev = to_amba_device(dev);
  51        int retval = 0;
  52
  53        retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
  54        if (retval)
  55                return retval;
  56
  57        retval = add_uevent_var(env, "MODALIAS=amba:d%08X", pcdev->periphid);
  58        return retval;
  59}
  60
  61#define amba_attr_func(name,fmt,arg...)                                 \
  62static ssize_t name##_show(struct device *_dev,                         \
  63                           struct device_attribute *attr, char *buf)    \
  64{                                                                       \
  65        struct amba_device *dev = to_amba_device(_dev);                 \
  66        return sprintf(buf, fmt, arg);                                  \
  67}
  68
  69#define amba_attr(name,fmt,arg...)      \
  70amba_attr_func(name,fmt,arg)            \
  71static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
  72
  73amba_attr_func(id, "%08x\n", dev->periphid);
  74amba_attr(irq0, "%u\n", dev->irq[0]);
  75amba_attr(irq1, "%u\n", dev->irq[1]);
  76amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
  77         (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
  78         dev->res.flags);
  79
  80static struct device_attribute amba_dev_attrs[] = {
  81        __ATTR_RO(id),
  82        __ATTR_RO(resource),
  83        __ATTR_NULL,
  84};
  85
  86#ifdef CONFIG_PM_SLEEP
  87
  88static int amba_legacy_suspend(struct device *dev, pm_message_t mesg)
  89{
  90        struct amba_driver *adrv = to_amba_driver(dev->driver);
  91        struct amba_device *adev = to_amba_device(dev);
  92        int ret = 0;
  93
  94        if (dev->driver && adrv->suspend)
  95                ret = adrv->suspend(adev, mesg);
  96
  97        return ret;
  98}
  99
 100static int amba_legacy_resume(struct device *dev)
 101{
 102        struct amba_driver *adrv = to_amba_driver(dev->driver);
 103        struct amba_device *adev = to_amba_device(dev);
 104        int ret = 0;
 105
 106        if (dev->driver && adrv->resume)
 107                ret = adrv->resume(adev);
 108
 109        return ret;
 110}
 111
 112#endif /* CONFIG_PM_SLEEP */
 113
 114#ifdef CONFIG_SUSPEND
 115
 116static int amba_pm_suspend(struct device *dev)
 117{
 118        struct device_driver *drv = dev->driver;
 119        int ret = 0;
 120
 121        if (!drv)
 122                return 0;
 123
 124        if (drv->pm) {
 125                if (drv->pm->suspend)
 126                        ret = drv->pm->suspend(dev);
 127        } else {
 128                ret = amba_legacy_suspend(dev, PMSG_SUSPEND);
 129        }
 130
 131        return ret;
 132}
 133
 134static int amba_pm_resume(struct device *dev)
 135{
 136        struct device_driver *drv = dev->driver;
 137        int ret = 0;
 138
 139        if (!drv)
 140                return 0;
 141
 142        if (drv->pm) {
 143                if (drv->pm->resume)
 144                        ret = drv->pm->resume(dev);
 145        } else {
 146                ret = amba_legacy_resume(dev);
 147        }
 148
 149        return ret;
 150}
 151
 152#else /* !CONFIG_SUSPEND */
 153
 154#define amba_pm_suspend         NULL
 155#define amba_pm_resume          NULL
 156
 157#endif /* !CONFIG_SUSPEND */
 158
 159#ifdef CONFIG_HIBERNATE_CALLBACKS
 160
 161static int amba_pm_freeze(struct device *dev)
 162{
 163        struct device_driver *drv = dev->driver;
 164        int ret = 0;
 165
 166        if (!drv)
 167                return 0;
 168
 169        if (drv->pm) {
 170                if (drv->pm->freeze)
 171                        ret = drv->pm->freeze(dev);
 172        } else {
 173                ret = amba_legacy_suspend(dev, PMSG_FREEZE);
 174        }
 175
 176        return ret;
 177}
 178
 179static int amba_pm_thaw(struct device *dev)
 180{
 181        struct device_driver *drv = dev->driver;
 182        int ret = 0;
 183
 184        if (!drv)
 185                return 0;
 186
 187        if (drv->pm) {
 188                if (drv->pm->thaw)
 189                        ret = drv->pm->thaw(dev);
 190        } else {
 191                ret = amba_legacy_resume(dev);
 192        }
 193
 194        return ret;
 195}
 196
 197static int amba_pm_poweroff(struct device *dev)
 198{
 199        struct device_driver *drv = dev->driver;
 200        int ret = 0;
 201
 202        if (!drv)
 203                return 0;
 204
 205        if (drv->pm) {
 206                if (drv->pm->poweroff)
 207                        ret = drv->pm->poweroff(dev);
 208        } else {
 209                ret = amba_legacy_suspend(dev, PMSG_HIBERNATE);
 210        }
 211
 212        return ret;
 213}
 214
 215static int amba_pm_restore(struct device *dev)
 216{
 217        struct device_driver *drv = dev->driver;
 218        int ret = 0;
 219
 220        if (!drv)
 221                return 0;
 222
 223        if (drv->pm) {
 224                if (drv->pm->restore)
 225                        ret = drv->pm->restore(dev);
 226        } else {
 227                ret = amba_legacy_resume(dev);
 228        }
 229
 230        return ret;
 231}
 232
 233#else /* !CONFIG_HIBERNATE_CALLBACKS */
 234
 235#define amba_pm_freeze          NULL
 236#define amba_pm_thaw            NULL
 237#define amba_pm_poweroff                NULL
 238#define amba_pm_restore         NULL
 239
 240#endif /* !CONFIG_HIBERNATE_CALLBACKS */
 241
 242#ifdef CONFIG_PM_RUNTIME
 243/*
 244 * Hooks to provide runtime PM of the pclk (bus clock).  It is safe to
 245 * enable/disable the bus clock at runtime PM suspend/resume as this
 246 * does not result in loss of context.
 247 */
 248static int amba_pm_runtime_suspend(struct device *dev)
 249{
 250        struct amba_device *pcdev = to_amba_device(dev);
 251        int ret = pm_generic_runtime_suspend(dev);
 252
 253        if (ret == 0 && dev->driver)
 254                clk_disable(pcdev->pclk);
 255
 256        return ret;
 257}
 258
 259static int amba_pm_runtime_resume(struct device *dev)
 260{
 261        struct amba_device *pcdev = to_amba_device(dev);
 262        int ret;
 263
 264        if (dev->driver) {
 265                ret = clk_enable(pcdev->pclk);
 266                /* Failure is probably fatal to the system, but... */
 267                if (ret)
 268                        return ret;
 269        }
 270
 271        return pm_generic_runtime_resume(dev);
 272}
 273#endif
 274
 275#ifdef CONFIG_PM
 276
 277static const struct dev_pm_ops amba_pm = {
 278        .suspend        = amba_pm_suspend,
 279        .resume         = amba_pm_resume,
 280        .freeze         = amba_pm_freeze,
 281        .thaw           = amba_pm_thaw,
 282        .poweroff       = amba_pm_poweroff,
 283        .restore        = amba_pm_restore,
 284        SET_RUNTIME_PM_OPS(
 285                amba_pm_runtime_suspend,
 286                amba_pm_runtime_resume,
 287                NULL
 288        )
 289};
 290
 291#define AMBA_PM (&amba_pm)
 292
 293#else /* !CONFIG_PM */
 294
 295#define AMBA_PM NULL
 296
 297#endif /* !CONFIG_PM */
 298
 299/*
 300 * Primecells are part of the Advanced Microcontroller Bus Architecture,
 301 * so we call the bus "amba".
 302 */
 303struct bus_type amba_bustype = {
 304        .name           = "amba",
 305        .dev_attrs      = amba_dev_attrs,
 306        .match          = amba_match,
 307        .uevent         = amba_uevent,
 308        .pm             = AMBA_PM,
 309};
 310
 311static int __init amba_init(void)
 312{
 313        return bus_register(&amba_bustype);
 314}
 315
 316postcore_initcall(amba_init);
 317
 318static int amba_get_enable_pclk(struct amba_device *pcdev)
 319{
 320        struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
 321        int ret;
 322
 323        pcdev->pclk = pclk;
 324
 325        if (IS_ERR(pclk))
 326                return PTR_ERR(pclk);
 327
 328        ret = clk_prepare(pclk);
 329        if (ret) {
 330                clk_put(pclk);
 331                return ret;
 332        }
 333
 334        ret = clk_enable(pclk);
 335        if (ret) {
 336                clk_unprepare(pclk);
 337                clk_put(pclk);
 338        }
 339
 340        return ret;
 341}
 342
 343static void amba_put_disable_pclk(struct amba_device *pcdev)
 344{
 345        struct clk *pclk = pcdev->pclk;
 346
 347        clk_disable(pclk);
 348        clk_unprepare(pclk);
 349        clk_put(pclk);
 350}
 351
 352/*
 353 * These are the device model conversion veneers; they convert the
 354 * device model structures to our more specific structures.
 355 */
 356static int amba_probe(struct device *dev)
 357{
 358        struct amba_device *pcdev = to_amba_device(dev);
 359        struct amba_driver *pcdrv = to_amba_driver(dev->driver);
 360        const struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
 361        int ret;
 362
 363        do {
 364                ret = amba_get_enable_pclk(pcdev);
 365                if (ret)
 366                        break;
 367
 368                pm_runtime_get_noresume(dev);
 369                pm_runtime_set_active(dev);
 370                pm_runtime_enable(dev);
 371
 372                ret = pcdrv->probe(pcdev, id);
 373                if (ret == 0)
 374                        break;
 375
 376                pm_runtime_disable(dev);
 377                pm_runtime_set_suspended(dev);
 378                pm_runtime_put_noidle(dev);
 379
 380                amba_put_disable_pclk(pcdev);
 381        } while (0);
 382
 383        return ret;
 384}
 385
 386static int amba_remove(struct device *dev)
 387{
 388        struct amba_device *pcdev = to_amba_device(dev);
 389        struct amba_driver *drv = to_amba_driver(dev->driver);
 390        int ret;
 391
 392        pm_runtime_get_sync(dev);
 393        ret = drv->remove(pcdev);
 394        pm_runtime_put_noidle(dev);
 395
 396        /* Undo the runtime PM settings in amba_probe() */
 397        pm_runtime_disable(dev);
 398        pm_runtime_set_suspended(dev);
 399        pm_runtime_put_noidle(dev);
 400
 401        amba_put_disable_pclk(pcdev);
 402
 403        return ret;
 404}
 405
 406static void amba_shutdown(struct device *dev)
 407{
 408        struct amba_driver *drv = to_amba_driver(dev->driver);
 409        drv->shutdown(to_amba_device(dev));
 410}
 411
 412/**
 413 *      amba_driver_register - register an AMBA device driver
 414 *      @drv: amba device driver structure
 415 *
 416 *      Register an AMBA device driver with the Linux device model
 417 *      core.  If devices pre-exist, the drivers probe function will
 418 *      be called.
 419 */
 420int amba_driver_register(struct amba_driver *drv)
 421{
 422        drv->drv.bus = &amba_bustype;
 423
 424#define SETFN(fn)       if (drv->fn) drv->drv.fn = amba_##fn
 425        SETFN(probe);
 426        SETFN(remove);
 427        SETFN(shutdown);
 428
 429        return driver_register(&drv->drv);
 430}
 431
 432/**
 433 *      amba_driver_unregister - remove an AMBA device driver
 434 *      @drv: AMBA device driver structure to remove
 435 *
 436 *      Unregister an AMBA device driver from the Linux device
 437 *      model.  The device model will call the drivers remove function
 438 *      for each device the device driver is currently handling.
 439 */
 440void amba_driver_unregister(struct amba_driver *drv)
 441{
 442        driver_unregister(&drv->drv);
 443}
 444
 445
 446static void amba_device_release(struct device *dev)
 447{
 448        struct amba_device *d = to_amba_device(dev);
 449
 450        if (d->res.parent)
 451                release_resource(&d->res);
 452        kfree(d);
 453}
 454
 455/**
 456 *      amba_device_add - add a previously allocated AMBA device structure
 457 *      @dev: AMBA device allocated by amba_device_alloc
 458 *      @parent: resource parent for this devices resources
 459 *
 460 *      Claim the resource, and read the device cell ID if not already
 461 *      initialized.  Register the AMBA device with the Linux device
 462 *      manager.
 463 */
 464int amba_device_add(struct amba_device *dev, struct resource *parent)
 465{
 466        u32 size;
 467        void __iomem *tmp;
 468        int i, ret;
 469
 470        WARN_ON(dev->irq[0] == (unsigned int)-1);
 471        WARN_ON(dev->irq[1] == (unsigned int)-1);
 472
 473        ret = request_resource(parent, &dev->res);
 474        if (ret)
 475                goto err_out;
 476
 477        /* Hard-coded primecell ID instead of plug-n-play */
 478        if (dev->periphid != 0)
 479                goto skip_probe;
 480
 481        /*
 482         * Dynamically calculate the size of the resource
 483         * and use this for iomap
 484         */
 485        size = resource_size(&dev->res);
 486        tmp = ioremap(dev->res.start, size);
 487        if (!tmp) {
 488                ret = -ENOMEM;
 489                goto err_release;
 490        }
 491
 492        ret = amba_get_enable_pclk(dev);
 493        if (ret == 0) {
 494                u32 pid, cid;
 495
 496                /*
 497                 * Read pid and cid based on size of resource
 498                 * they are located at end of region
 499                 */
 500                for (pid = 0, i = 0; i < 4; i++)
 501                        pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
 502                                (i * 8);
 503                for (cid = 0, i = 0; i < 4; i++)
 504                        cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
 505                                (i * 8);
 506
 507                amba_put_disable_pclk(dev);
 508
 509                if (cid == AMBA_CID)
 510                        dev->periphid = pid;
 511
 512                if (!dev->periphid)
 513                        ret = -ENODEV;
 514        }
 515
 516        iounmap(tmp);
 517
 518        if (ret)
 519                goto err_release;
 520
 521 skip_probe:
 522        ret = device_add(&dev->dev);
 523        if (ret)
 524                goto err_release;
 525
 526        if (dev->irq[0])
 527                ret = device_create_file(&dev->dev, &dev_attr_irq0);
 528        if (ret == 0 && dev->irq[1])
 529                ret = device_create_file(&dev->dev, &dev_attr_irq1);
 530        if (ret == 0)
 531                return ret;
 532
 533        device_unregister(&dev->dev);
 534
 535 err_release:
 536        release_resource(&dev->res);
 537 err_out:
 538        return ret;
 539}
 540EXPORT_SYMBOL_GPL(amba_device_add);
 541
 542static struct amba_device *
 543amba_aphb_device_add(struct device *parent, const char *name,
 544                     resource_size_t base, size_t size, int irq1, int irq2,
 545                     void *pdata, unsigned int periphid, u64 dma_mask,
 546                     struct resource *resbase)
 547{
 548        struct amba_device *dev;
 549        int ret;
 550
 551        dev = amba_device_alloc(name, base, size);
 552        if (!dev)
 553                return ERR_PTR(-ENOMEM);
 554
 555        dev->dma_mask = dma_mask;
 556        dev->dev.coherent_dma_mask = dma_mask;
 557        dev->irq[0] = irq1;
 558        dev->irq[1] = irq2;
 559        dev->periphid = periphid;
 560        dev->dev.platform_data = pdata;
 561        dev->dev.parent = parent;
 562
 563        ret = amba_device_add(dev, resbase);
 564        if (ret) {
 565                amba_device_put(dev);
 566                return ERR_PTR(ret);
 567        }
 568
 569        return dev;
 570}
 571
 572struct amba_device *
 573amba_apb_device_add(struct device *parent, const char *name,
 574                    resource_size_t base, size_t size, int irq1, int irq2,
 575                    void *pdata, unsigned int periphid)
 576{
 577        return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
 578                                    periphid, 0, &iomem_resource);
 579}
 580EXPORT_SYMBOL_GPL(amba_apb_device_add);
 581
 582struct amba_device *
 583amba_ahb_device_add(struct device *parent, const char *name,
 584                    resource_size_t base, size_t size, int irq1, int irq2,
 585                    void *pdata, unsigned int periphid)
 586{
 587        return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
 588                                    periphid, ~0ULL, &iomem_resource);
 589}
 590EXPORT_SYMBOL_GPL(amba_ahb_device_add);
 591
 592struct amba_device *
 593amba_apb_device_add_res(struct device *parent, const char *name,
 594                        resource_size_t base, size_t size, int irq1,
 595                        int irq2, void *pdata, unsigned int periphid,
 596                        struct resource *resbase)
 597{
 598        return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
 599                                    periphid, 0, resbase);
 600}
 601EXPORT_SYMBOL_GPL(amba_apb_device_add_res);
 602
 603struct amba_device *
 604amba_ahb_device_add_res(struct device *parent, const char *name,
 605                        resource_size_t base, size_t size, int irq1,
 606                        int irq2, void *pdata, unsigned int periphid,
 607                        struct resource *resbase)
 608{
 609        return amba_aphb_device_add(parent, name, base, size, irq1, irq2, pdata,
 610                                    periphid, ~0ULL, resbase);
 611}
 612EXPORT_SYMBOL_GPL(amba_ahb_device_add_res);
 613
 614
 615static void amba_device_initialize(struct amba_device *dev, const char *name)
 616{
 617        device_initialize(&dev->dev);
 618        if (name)
 619                dev_set_name(&dev->dev, "%s", name);
 620        dev->dev.release = amba_device_release;
 621        dev->dev.bus = &amba_bustype;
 622        dev->dev.dma_mask = &dev->dma_mask;
 623        dev->res.name = dev_name(&dev->dev);
 624}
 625
 626/**
 627 *      amba_device_alloc - allocate an AMBA device
 628 *      @name: sysfs name of the AMBA device
 629 *      @base: base of AMBA device
 630 *      @size: size of AMBA device
 631 *
 632 *      Allocate and initialize an AMBA device structure.  Returns %NULL
 633 *      on failure.
 634 */
 635struct amba_device *amba_device_alloc(const char *name, resource_size_t base,
 636        size_t size)
 637{
 638        struct amba_device *dev;
 639
 640        dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 641        if (dev) {
 642                amba_device_initialize(dev, name);
 643                dev->res.start = base;
 644                dev->res.end = base + size - 1;
 645                dev->res.flags = IORESOURCE_MEM;
 646        }
 647
 648        return dev;
 649}
 650EXPORT_SYMBOL_GPL(amba_device_alloc);
 651
 652/**
 653 *      amba_device_register - register an AMBA device
 654 *      @dev: AMBA device to register
 655 *      @parent: parent memory resource
 656 *
 657 *      Setup the AMBA device, reading the cell ID if present.
 658 *      Claim the resource, and register the AMBA device with
 659 *      the Linux device manager.
 660 */
 661int amba_device_register(struct amba_device *dev, struct resource *parent)
 662{
 663        amba_device_initialize(dev, dev->dev.init_name);
 664        dev->dev.init_name = NULL;
 665
 666        if (!dev->dev.coherent_dma_mask && dev->dma_mask)
 667                dev_warn(&dev->dev, "coherent dma mask is unset\n");
 668
 669        return amba_device_add(dev, parent);
 670}
 671
 672/**
 673 *      amba_device_put - put an AMBA device
 674 *      @dev: AMBA device to put
 675 */
 676void amba_device_put(struct amba_device *dev)
 677{
 678        put_device(&dev->dev);
 679}
 680EXPORT_SYMBOL_GPL(amba_device_put);
 681
 682/**
 683 *      amba_device_unregister - unregister an AMBA device
 684 *      @dev: AMBA device to remove
 685 *
 686 *      Remove the specified AMBA device from the Linux device
 687 *      manager.  All files associated with this object will be
 688 *      destroyed, and device drivers notified that the device has
 689 *      been removed.  The AMBA device's resources including
 690 *      the amba_device structure will be freed once all
 691 *      references to it have been dropped.
 692 */
 693void amba_device_unregister(struct amba_device *dev)
 694{
 695        device_unregister(&dev->dev);
 696}
 697
 698
 699struct find_data {
 700        struct amba_device *dev;
 701        struct device *parent;
 702        const char *busid;
 703        unsigned int id;
 704        unsigned int mask;
 705};
 706
 707static int amba_find_match(struct device *dev, void *data)
 708{
 709        struct find_data *d = data;
 710        struct amba_device *pcdev = to_amba_device(dev);
 711        int r;
 712
 713        r = (pcdev->periphid & d->mask) == d->id;
 714        if (d->parent)
 715                r &= d->parent == dev->parent;
 716        if (d->busid)
 717                r &= strcmp(dev_name(dev), d->busid) == 0;
 718
 719        if (r) {
 720                get_device(dev);
 721                d->dev = pcdev;
 722        }
 723
 724        return r;
 725}
 726
 727/**
 728 *      amba_find_device - locate an AMBA device given a bus id
 729 *      @busid: bus id for device (or NULL)
 730 *      @parent: parent device (or NULL)
 731 *      @id: peripheral ID (or 0)
 732 *      @mask: peripheral ID mask (or 0)
 733 *
 734 *      Return the AMBA device corresponding to the supplied parameters.
 735 *      If no device matches, returns NULL.
 736 *
 737 *      NOTE: When a valid device is found, its refcount is
 738 *      incremented, and must be decremented before the returned
 739 *      reference.
 740 */
 741struct amba_device *
 742amba_find_device(const char *busid, struct device *parent, unsigned int id,
 743                 unsigned int mask)
 744{
 745        struct find_data data;
 746
 747        data.dev = NULL;
 748        data.parent = parent;
 749        data.busid = busid;
 750        data.id = id;
 751        data.mask = mask;
 752
 753        bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
 754
 755        return data.dev;
 756}
 757
 758/**
 759 *      amba_request_regions - request all mem regions associated with device
 760 *      @dev: amba_device structure for device
 761 *      @name: name, or NULL to use driver name
 762 */
 763int amba_request_regions(struct amba_device *dev, const char *name)
 764{
 765        int ret = 0;
 766        u32 size;
 767
 768        if (!name)
 769                name = dev->dev.driver->name;
 770
 771        size = resource_size(&dev->res);
 772
 773        if (!request_mem_region(dev->res.start, size, name))
 774                ret = -EBUSY;
 775
 776        return ret;
 777}
 778
 779/**
 780 *      amba_release_regions - release mem regions associated with device
 781 *      @dev: amba_device structure for device
 782 *
 783 *      Release regions claimed by a successful call to amba_request_regions.
 784 */
 785void amba_release_regions(struct amba_device *dev)
 786{
 787        u32 size;
 788
 789        size = resource_size(&dev->res);
 790        release_mem_region(dev->res.start, size);
 791}
 792
 793EXPORT_SYMBOL(amba_driver_register);
 794EXPORT_SYMBOL(amba_driver_unregister);
 795EXPORT_SYMBOL(amba_device_register);
 796EXPORT_SYMBOL(amba_device_unregister);
 797EXPORT_SYMBOL(amba_find_device);
 798EXPORT_SYMBOL(amba_request_regions);
 799EXPORT_SYMBOL(amba_release_regions);
 800
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