[net-next-2.6.git] / drivers / amba / bus.c

/*
 *  linux/arch/arm/common/amba.c
 *
 *  Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/amba/bus.h>

#include <asm/irq.h>
#include <asm/sizes.h>

#define to_amba_device(d)	container_of(d, struct amba_device, dev)
#define to_amba_driver(d)	container_of(d, struct amba_driver, drv)

static struct amba_id *
amba_lookup(struct amba_id *table, struct amba_device *dev)
{
	int ret = 0;

	while (table->mask) {
		ret = (dev->periphid & table->mask) == table->id;
		if (ret)
			break;
		table++;
	}

	return ret ? table : NULL;
}

static int amba_match(struct device *dev, struct device_driver *drv)
{
	struct amba_device *pcdev = to_amba_device(dev);
	struct amba_driver *pcdrv = to_amba_driver(drv);

	return amba_lookup(pcdrv->id_table, pcdev) != NULL;
}

#ifdef CONFIG_HOTPLUG
static int amba_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct amba_device *pcdev = to_amba_device(dev);
	int retval = 0;

	retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
	return retval;
}
#else
#define amba_uevent NULL
#endif

static int amba_suspend(struct device *dev, pm_message_t state)
{
	struct amba_driver *drv = to_amba_driver(dev->driver);
	int ret = 0;

	if (dev->driver && drv->suspend)
		ret = drv->suspend(to_amba_device(dev), state);
	return ret;
}

static int amba_resume(struct device *dev)
{
	struct amba_driver *drv = to_amba_driver(dev->driver);
	int ret = 0;

	if (dev->driver && drv->resume)
		ret = drv->resume(to_amba_device(dev));
	return ret;
}

#define amba_attr_func(name,fmt,arg...)					\
static ssize_t name##_show(struct device *_dev,				\
			   struct device_attribute *attr, char *buf)	\
{									\
	struct amba_device *dev = to_amba_device(_dev);			\
	return sprintf(buf, fmt, arg);					\
}

#define amba_attr(name,fmt,arg...)	\
amba_attr_func(name,fmt,arg)		\
static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)

amba_attr_func(id, "%08x\n", dev->periphid);
amba_attr(irq0, "%u\n", dev->irq[0]);
amba_attr(irq1, "%u\n", dev->irq[1]);
amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
	 (unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
	 dev->res.flags);

static struct device_attribute amba_dev_attrs[] = {
	__ATTR_RO(id),
	__ATTR_RO(resource),
	__ATTR_NULL,
};

/*
 * Primecells are part of the Advanced Microcontroller Bus Architecture,
 * so we call the bus "amba".
 */
static struct bus_type amba_bustype = {
	.name		= "amba",
	.dev_attrs	= amba_dev_attrs,
	.match		= amba_match,
	.uevent		= amba_uevent,
	.suspend	= amba_suspend,
	.resume		= amba_resume,
};

static int __init amba_init(void)
{
	return bus_register(&amba_bustype);
}

postcore_initcall(amba_init);

static int amba_get_enable_pclk(struct amba_device *pcdev)
{
	struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
	int ret;

	pcdev->pclk = pclk;

	if (IS_ERR(pclk))
		return PTR_ERR(pclk);

	ret = clk_enable(pclk);
	if (ret)
		clk_put(pclk);

	return ret;
}

static void amba_put_disable_pclk(struct amba_device *pcdev)
{
	struct clk *pclk = pcdev->pclk;

	clk_disable(pclk);
	clk_put(pclk);
}

/*
 * These are the device model conversion veneers; they convert the
 * device model structures to our more specific structures.
 */
static int amba_probe(struct device *dev)
{
	struct amba_device *pcdev = to_amba_device(dev);
	struct amba_driver *pcdrv = to_amba_driver(dev->driver);
	struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
	int ret;

	do {
		ret = amba_get_enable_pclk(pcdev);
		if (ret)
			break;

		ret = pcdrv->probe(pcdev, id);
		if (ret == 0)
			break;

		amba_put_disable_pclk(pcdev);
	} while (0);

	return ret;
}

static int amba_remove(struct device *dev)
{
	struct amba_device *pcdev = to_amba_device(dev);
	struct amba_driver *drv = to_amba_driver(dev->driver);
	int ret = drv->remove(pcdev);

	amba_put_disable_pclk(pcdev);

	return ret;
}

static void amba_shutdown(struct device *dev)
{
	struct amba_driver *drv = to_amba_driver(dev->driver);
	drv->shutdown(to_amba_device(dev));
}

/**
 *	amba_driver_register - register an AMBA device driver
 *	@drv: amba device driver structure
 *
 *	Register an AMBA device driver with the Linux device model
 *	core.  If devices pre-exist, the drivers probe function will
 *	be called.
 */
int amba_driver_register(struct amba_driver *drv)
{
	drv->drv.bus = &amba_bustype;

#define SETFN(fn)	if (drv->fn) drv->drv.fn = amba_##fn
	SETFN(probe);
	SETFN(remove);
	SETFN(shutdown);

	return driver_register(&drv->drv);
}

/**
 *	amba_driver_unregister - remove an AMBA device driver
 *	@drv: AMBA device driver structure to remove
 *
 *	Unregister an AMBA device driver from the Linux device
 *	model.  The device model will call the drivers remove function
 *	for each device the device driver is currently handling.
 */
void amba_driver_unregister(struct amba_driver *drv)
{
	driver_unregister(&drv->drv);
}


static void amba_device_release(struct device *dev)
{
	struct amba_device *d = to_amba_device(dev);

	if (d->res.parent)
		release_resource(&d->res);
	kfree(d);
}

/**
 *	amba_device_register - register an AMBA device
 *	@dev: AMBA device to register
 *	@parent: parent memory resource
 *
 *	Setup the AMBA device, reading the cell ID if present.
 *	Claim the resource, and register the AMBA device with
 *	the Linux device manager.
 */
int amba_device_register(struct amba_device *dev, struct resource *parent)
{
	u32 size;
	void __iomem *tmp;
	int i, ret;

	device_initialize(&dev->dev);

	/*
	 * Copy from device_add
	 */
	if (dev->dev.init_name) {
		dev_set_name(&dev->dev, "%s", dev->dev.init_name);
		dev->dev.init_name = NULL;
	}

	dev->dev.release = amba_device_release;
	dev->dev.bus = &amba_bustype;
	dev->dev.dma_mask = &dev->dma_mask;
	dev->res.name = dev_name(&dev->dev);

	if (!dev->dev.coherent_dma_mask && dev->dma_mask)
		dev_warn(&dev->dev, "coherent dma mask is unset\n");

	ret = request_resource(parent, &dev->res);
	if (ret)
		goto err_out;

	/*
	 * Dynamically calculate the size of the resource
	 * and use this for iomap
	 */
	size = resource_size(&dev->res);
	tmp = ioremap(dev->res.start, size);
	if (!tmp) {
		ret = -ENOMEM;
		goto err_release;
	}

	ret = amba_get_enable_pclk(dev);
	if (ret == 0) {
		u32 pid, cid;

		/*
		 * Read pid and cid based on size of resource
		 * they are located at end of region
		 */
		for (pid = 0, i = 0; i < 4; i++)
			pid |= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
				(i * 8);
		for (cid = 0, i = 0; i < 4; i++)
			cid |= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
				(i * 8);

		amba_put_disable_pclk(dev);

		if (cid == AMBA_CID)
			dev->periphid = pid;

		if (!dev->periphid)
			ret = -ENODEV;
	}

	iounmap(tmp);

	if (ret)
		goto err_release;

	ret = device_add(&dev->dev);
	if (ret)
		goto err_release;

	if (dev->irq[0] != NO_IRQ)
		ret = device_create_file(&dev->dev, &dev_attr_irq0);
	if (ret == 0 && dev->irq[1] != NO_IRQ)
		ret = device_create_file(&dev->dev, &dev_attr_irq1);
	if (ret == 0)
		return ret;

	device_unregister(&dev->dev);

 err_release:
	release_resource(&dev->res);
 err_out:
	return ret;
}

/**
 *	amba_device_unregister - unregister an AMBA device
 *	@dev: AMBA device to remove
 *
 *	Remove the specified AMBA device from the Linux device
 *	manager.  All files associated with this object will be
 *	destroyed, and device drivers notified that the device has
 *	been removed.  The AMBA device's resources including
 *	the amba_device structure will be freed once all
 *	references to it have been dropped.
 */
void amba_device_unregister(struct amba_device *dev)
{
	device_unregister(&dev->dev);
}


struct find_data {
	struct amba_device *dev;
	struct device *parent;
	const char *busid;
	unsigned int id;
	unsigned int mask;
};

static int amba_find_match(struct device *dev, void *data)
{
	struct find_data *d = data;
	struct amba_device *pcdev = to_amba_device(dev);
	int r;

	r = (pcdev->periphid & d->mask) == d->id;
	if (d->parent)
		r &= d->parent == dev->parent;
	if (d->busid)
		r &= strcmp(dev_name(dev), d->busid) == 0;

	if (r) {
		get_device(dev);
		d->dev = pcdev;
	}

	return r;
}

/**
 *	amba_find_device - locate an AMBA device given a bus id
 *	@busid: bus id for device (or NULL)
 *	@parent: parent device (or NULL)
 *	@id: peripheral ID (or 0)
 *	@mask: peripheral ID mask (or 0)
 *
 *	Return the AMBA device corresponding to the supplied parameters.
 *	If no device matches, returns NULL.
 *
 *	NOTE: When a valid device is found, its refcount is
 *	incremented, and must be decremented before the returned
 *	reference.
 */
struct amba_device *
amba_find_device(const char *busid, struct device *parent, unsigned int id,
		 unsigned int mask)
{
	struct find_data data;

	data.dev = NULL;
	data.parent = parent;
	data.busid = busid;
	data.id = id;
	data.mask = mask;

	bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);

	return data.dev;
}

/**
 *	amba_request_regions - request all mem regions associated with device
 *	@dev: amba_device structure for device
 *	@name: name, or NULL to use driver name
 */
int amba_request_regions(struct amba_device *dev, const char *name)
{
	int ret = 0;
	u32 size;

	if (!name)
		name = dev->dev.driver->name;

	size = resource_size(&dev->res);

	if (!request_mem_region(dev->res.start, size, name))
		ret = -EBUSY;

	return ret;
}

/**
 *	amba_release_regions - release mem regions assoicated with device
 *	@dev: amba_device structure for device
 *
 *	Release regions claimed by a successful call to amba_request_regions.
 */
void amba_release_regions(struct amba_device *dev)
{
	u32 size;

	size = resource_size(&dev->res);
	release_mem_region(dev->res.start, size);
}

EXPORT_SYMBOL(amba_driver_register);
EXPORT_SYMBOL(amba_driver_unregister);
EXPORT_SYMBOL(amba_device_register);
EXPORT_SYMBOL(amba_device_unregister);
EXPORT_SYMBOL(amba_find_device);
EXPORT_SYMBOL(amba_request_regions);
EXPORT_SYMBOL(amba_release_regions);
Commit	Line	Data
1da177e4 LT	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>
4e57b681 TS	13	#include <linux/string.h>
4e57b681 TS	14	#include <linux/slab.h>
934848da	15	#include <linux/io.h>
a62c80e5	16	#include <linux/amba/bus.h>
1da177e4	17
934848da	18	#include <asm/irq.h>
1da177e4 LT	19	#include <asm/sizes.h>
	20
	21	#define to_amba_device(d) container_of(d, struct amba_device, dev)
	22	#define to_amba_driver(d) container_of(d, struct amba_driver, drv)
	23
	24	static struct amba_id *
	25	amba_lookup(struct amba_id table, struct amba_device dev)
	26	{
	27	int ret = 0;
	28
	29	while (table->mask) {
	30	ret = (dev->periphid & table->mask) == table->id;
	31	if (ret)
	32	break;
	33	table++;
	34	}
	35
	36	return ret ? table : NULL;
	37	}
	38
	39	static int amba_match(struct device dev, struct device_driver drv)
	40	{
	41	struct amba_device *pcdev = to_amba_device(dev);
	42	struct amba_driver *pcdrv = to_amba_driver(drv);
	43
	44	return amba_lookup(pcdrv->id_table, pcdev) != NULL;
	45	}
	46
	47	#ifdef CONFIG_HOTPLUG
7eff2e7a	48	static int amba_uevent(struct device dev, struct kobj_uevent_env env)
1da177e4 LT	49	{
1da177e4 LT	50	struct amba_device *pcdev = to_amba_device(dev);
7eff2e7a	51	int retval = 0;
1da177e4	52
7eff2e7a	53	retval = add_uevent_var(env, "AMBA_ID=%08x", pcdev->periphid);
bf62456e	54	return retval;
1da177e4 LT	55	}
1da177e4 LT	56	#else
6d20b035	57	#define amba_uevent NULL
1da177e4 LT	58	#endif
	59
	60	static int amba_suspend(struct device *dev, pm_message_t state)
	61	{
	62	struct amba_driver *drv = to_amba_driver(dev->driver);
	63	int ret = 0;
	64
	65	if (dev->driver && drv->suspend)
	66	ret = drv->suspend(to_amba_device(dev), state);
	67	return ret;
	68	}
	69
	70	static int amba_resume(struct device *dev)
	71	{
	72	struct amba_driver *drv = to_amba_driver(dev->driver);
	73	int ret = 0;
	74
	75	if (dev->driver && drv->resume)
	76	ret = drv->resume(to_amba_device(dev));
	77	return ret;
	78	}
	79
96b13f5c RK	80	#define amba_attr_func(name,fmt,arg...) \
	81	static ssize_t name##_show(struct device *_dev, \
	82	struct device_attribute attr, char buf) \
	83	{ \
	84	struct amba_device *dev = to_amba_device(_dev); \
	85	return sprintf(buf, fmt, arg); \
	86	}
	87
	88	#define amba_attr(name,fmt,arg...) \
	89	amba_attr_func(name,fmt,arg) \
	90	static DEVICE_ATTR(name, S_IRUGO, name##_show, NULL)
	91
	92	amba_attr_func(id, "%08x\n", dev->periphid);
	93	amba_attr(irq0, "%u\n", dev->irq[0]);
	94	amba_attr(irq1, "%u\n", dev->irq[1]);
	95	amba_attr_func(resource, "\t%016llx\t%016llx\t%016lx\n",
	96	(unsigned long long)dev->res.start, (unsigned long long)dev->res.end,
	97	dev->res.flags);
	98
	99	static struct device_attribute amba_dev_attrs[] = {
	100	__ATTR_RO(id),
	101	__ATTR_RO(resource),
	102	__ATTR_NULL,
	103	};
	104
1da177e4 LT	105	/*
	106	* Primecells are part of the Advanced Microcontroller Bus Architecture,
	107	* so we call the bus "amba".
	108	*/
	109	static struct bus_type amba_bustype = {
	110	.name = "amba",
96b13f5c	111	.dev_attrs = amba_dev_attrs,
1da177e4	112	.match = amba_match,
6d20b035	113	.uevent = amba_uevent,
1da177e4 LT	114	.suspend = amba_suspend,
	115	.resume = amba_resume,
	116	};
	117
	118	static int __init amba_init(void)
	119	{
	120	return bus_register(&amba_bustype);
	121	}
	122
	123	postcore_initcall(amba_init);
	124
7cfe2494 RK	125	static int amba_get_enable_pclk(struct amba_device *pcdev)
	126	{
	127	struct clk *pclk = clk_get(&pcdev->dev, "apb_pclk");
	128	int ret;
	129
	130	pcdev->pclk = pclk;
	131
	132	if (IS_ERR(pclk))
	133	return PTR_ERR(pclk);
	134
	135	ret = clk_enable(pclk);
	136	if (ret)
	137	clk_put(pclk);
	138
	139	return ret;
	140	}
	141
	142	static void amba_put_disable_pclk(struct amba_device *pcdev)
	143	{
	144	struct clk *pclk = pcdev->pclk;
	145
	146	clk_disable(pclk);
	147	clk_put(pclk);
	148	}
	149
1da177e4 LT	150	/*
	151	* These are the device model conversion veneers; they convert the
	152	* device model structures to our more specific structures.
	153	*/
	154	static int amba_probe(struct device *dev)
	155	{
	156	struct amba_device *pcdev = to_amba_device(dev);
	157	struct amba_driver *pcdrv = to_amba_driver(dev->driver);
7cfe2494 RK	158	struct amba_id *id = amba_lookup(pcdrv->id_table, pcdev);
7cfe2494 RK	159	int ret;
1da177e4	160
7cfe2494 RK	161	do {
	162	ret = amba_get_enable_pclk(pcdev);
	163	if (ret)
	164	break;
	165
	166	ret = pcdrv->probe(pcdev, id);
	167	if (ret == 0)
	168	break;
1da177e4	169
7cfe2494 RK	170	amba_put_disable_pclk(pcdev);
	171	} while (0);
	172
	173	return ret;
1da177e4 LT	174	}
	175
	176	static int amba_remove(struct device *dev)
	177	{
7cfe2494	178	struct amba_device *pcdev = to_amba_device(dev);
1da177e4	179	struct amba_driver *drv = to_amba_driver(dev->driver);
7cfe2494 RK	180	int ret = drv->remove(pcdev);
	181
	182	amba_put_disable_pclk(pcdev);
	183
	184	return ret;
1da177e4 LT	185	}
	186
	187	static void amba_shutdown(struct device *dev)
	188	{
	189	struct amba_driver *drv = to_amba_driver(dev->driver);
	190	drv->shutdown(to_amba_device(dev));
	191	}
	192
	193	/**
	194	* amba_driver_register - register an AMBA device driver
	195	* @drv: amba device driver structure
	196	*
	197	* Register an AMBA device driver with the Linux device model
	198	* core. If devices pre-exist, the drivers probe function will
	199	* be called.
	200	*/
	201	int amba_driver_register(struct amba_driver *drv)
	202	{
	203	drv->drv.bus = &amba_bustype;
	204
	205	#define SETFN(fn) if (drv->fn) drv->drv.fn = amba_##fn
	206	SETFN(probe);
	207	SETFN(remove);
	208	SETFN(shutdown);
	209
	210	return driver_register(&drv->drv);
	211	}
	212
	213	/**
	214	* amba_driver_unregister - remove an AMBA device driver
	215	* @drv: AMBA device driver structure to remove
	216	*
	217	* Unregister an AMBA device driver from the Linux device
	218	* model. The device model will call the drivers remove function
	219	* for each device the device driver is currently handling.
	220	*/
	221	void amba_driver_unregister(struct amba_driver *drv)
	222	{
	223	driver_unregister(&drv->drv);
	224	}
	225
	226
	227	static void amba_device_release(struct device *dev)
	228	{
	229	struct amba_device *d = to_amba_device(dev);
	230
	231	if (d->res.parent)
	232	release_resource(&d->res);
	233	kfree(d);
	234	}
	235
1da177e4 LT	236	/**
	237	* amba_device_register - register an AMBA device
	238	* @dev: AMBA device to register
	239	* @parent: parent memory resource
	240	*
	241	* Setup the AMBA device, reading the cell ID if present.
	242	* Claim the resource, and register the AMBA device with
	243	* the Linux device manager.
	244	*/
	245	int amba_device_register(struct amba_device dev, struct resource parent)
	246	{
8afe0b96	247	u32 size;
1da177e4 LT	248	void __iomem *tmp;
	249	int i, ret;
	250
557dca5f RK	251	device_initialize(&dev->dev);
	252
	253	/*
	254	* Copy from device_add
	255	*/
	256	if (dev->dev.init_name) {
	257	dev_set_name(&dev->dev, "%s", dev->dev.init_name);
	258	dev->dev.init_name = NULL;
	259	}
	260
1da177e4 LT	261	dev->dev.release = amba_device_release;
	262	dev->dev.bus = &amba_bustype;
	263	dev->dev.dma_mask = &dev->dma_mask;
9d6b4c82	264	dev->res.name = dev_name(&dev->dev);
1da177e4 LT	265
	266	if (!dev->dev.coherent_dma_mask && dev->dma_mask)
	267	dev_warn(&dev->dev, "coherent dma mask is unset\n");
	268
	269	ret = request_resource(parent, &dev->res);
96b13f5c RK	270	if (ret)
	271	goto err_out;
	272
8afe0b96 LC	273	/*
	274	* Dynamically calculate the size of the resource
	275	* and use this for iomap
	276	*/
	277	size = resource_size(&dev->res);
	278	tmp = ioremap(dev->res.start, size);
96b13f5c RK	279	if (!tmp) {
	280	ret = -ENOMEM;
	281	goto err_release;
1da177e4	282	}
96b13f5c	283
7cfe2494 RK	284	ret = amba_get_enable_pclk(dev);
	285	if (ret == 0) {
	286	u32 pid, cid;
96b13f5c	287
7cfe2494 RK	288	/*
	289	* Read pid and cid based on size of resource
	290	* they are located at end of region
	291	*/
	292	for (pid = 0, i = 0; i < 4; i++)
	293	pid \|= (readl(tmp + size - 0x20 + 4 * i) & 255) <<
	294	(i * 8);
	295	for (cid = 0, i = 0; i < 4; i++)
	296	cid \|= (readl(tmp + size - 0x10 + 4 * i) & 255) <<
	297	(i * 8);
96b13f5c	298
7cfe2494	299	amba_put_disable_pclk(dev);
96b13f5c	300
01723a95	301	if (cid == AMBA_CID)
7cfe2494 RK	302	dev->periphid = pid;
	303
	304	if (!dev->periphid)
	305	ret = -ENODEV;
96b13f5c RK	306	}
96b13f5c RK	307
7cfe2494 RK	308	iounmap(tmp);
	309
	310	if (ret)
	311	goto err_release;
	312
557dca5f	313	ret = device_add(&dev->dev);
96b13f5c RK	314	if (ret)
	315	goto err_release;
	316
	317	if (dev->irq[0] != NO_IRQ)
	318	ret = device_create_file(&dev->dev, &dev_attr_irq0);
	319	if (ret == 0 && dev->irq[1] != NO_IRQ)
	320	ret = device_create_file(&dev->dev, &dev_attr_irq1);
	321	if (ret == 0)
	322	return ret;
	323
	324	device_unregister(&dev->dev);
	325
	326	err_release:
	327	release_resource(&dev->res);
	328	err_out:
1da177e4 LT	329	return ret;
	330	}
	331
	332	/**
	333	* amba_device_unregister - unregister an AMBA device
	334	* @dev: AMBA device to remove
	335	*
	336	* Remove the specified AMBA device from the Linux device
	337	* manager. All files associated with this object will be
	338	* destroyed, and device drivers notified that the device has
	339	* been removed. The AMBA device's resources including
	340	* the amba_device structure will be freed once all
	341	* references to it have been dropped.
	342	*/
	343	void amba_device_unregister(struct amba_device *dev)
	344	{
	345	device_unregister(&dev->dev);
	346	}
	347
	348
	349	struct find_data {
	350	struct amba_device *dev;
	351	struct device *parent;
	352	const char *busid;
	353	unsigned int id;
	354	unsigned int mask;
	355	};
	356
	357	static int amba_find_match(struct device dev, void data)
	358	{
	359	struct find_data *d = data;
	360	struct amba_device *pcdev = to_amba_device(dev);
	361	int r;
	362
	363	r = (pcdev->periphid & d->mask) == d->id;
	364	if (d->parent)
	365	r &= d->parent == dev->parent;
	366	if (d->busid)
9d6b4c82	367	r &= strcmp(dev_name(dev), d->busid) == 0;
1da177e4 LT	368
	369	if (r) {
	370	get_device(dev);
	371	d->dev = pcdev;
	372	}
	373
	374	return r;
	375	}
	376
	377	/**
	378	* amba_find_device - locate an AMBA device given a bus id
	379	* @busid: bus id for device (or NULL)
	380	* @parent: parent device (or NULL)
	381	* @id: peripheral ID (or 0)
	382	* @mask: peripheral ID mask (or 0)
	383	*
	384	* Return the AMBA device corresponding to the supplied parameters.
	385	* If no device matches, returns NULL.
	386	*
	387	* NOTE: When a valid device is found, its refcount is
	388	* incremented, and must be decremented before the returned
	389	* reference.
	390	*/
	391	struct amba_device *
	392	amba_find_device(const char busid, struct device parent, unsigned int id,
	393	unsigned int mask)
	394	{
	395	struct find_data data;
	396
	397	data.dev = NULL;
	398	data.parent = parent;
	399	data.busid = busid;
	400	data.id = id;
	401	data.mask = mask;
	402
	403	bus_for_each_dev(&amba_bustype, NULL, &data, amba_find_match);
	404
	405	return data.dev;
	406	}
	407
	408	/**
	409	* amba_request_regions - request all mem regions associated with device
	410	* @dev: amba_device structure for device
	411	* @name: name, or NULL to use driver name
	412	*/
	413	int amba_request_regions(struct amba_device dev, const char name)
	414	{
	415	int ret = 0;
8afe0b96	416	u32 size;
1da177e4 LT	417
	418	if (!name)
	419	name = dev->dev.driver->name;
	420
8afe0b96 LC	421	size = resource_size(&dev->res);
	422
	423	if (!request_mem_region(dev->res.start, size, name))
1da177e4 LT	424	ret = -EBUSY;
	425
	426	return ret;
	427	}
	428
	429	/**
	430	* amba_release_regions - release mem regions assoicated with device
	431	* @dev: amba_device structure for device
	432	*
	433	* Release regions claimed by a successful call to amba_request_regions.
	434	*/
	435	void amba_release_regions(struct amba_device *dev)
	436	{
8afe0b96 LC	437	u32 size;
	438
	439	size = resource_size(&dev->res);
	440	release_mem_region(dev->res.start, size);
1da177e4 LT	441	}
	442
	443	EXPORT_SYMBOL(amba_driver_register);
	444	EXPORT_SYMBOL(amba_driver_unregister);
	445	EXPORT_SYMBOL(amba_device_register);
	446	EXPORT_SYMBOL(amba_device_unregister);
	447	EXPORT_SYMBOL(amba_find_device);
	448	EXPORT_SYMBOL(amba_request_regions);
	449	EXPORT_SYMBOL(amba_release_regions);