/* *  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 <asm/io.h>#include <asm/irq.h>#include <asm/hardware/amba.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_HOTPLUGstatic int amba_hotplug(struct device *dev, char **envp, int nr_env, char *buf, int bufsz){	struct amba_device *pcdev = to_amba_device(dev);	if (nr_env < 2)		return -ENOMEM;	snprintf(buf, bufsz, "AMBA_ID=%08x", pcdev->periphid);	*envp++ = buf;	*envp++ = NULL;	return 0;}#else#define amba_hotplug NULL#endifstatic 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;}/* * Primecells are part of the Advanced Microcontroller Bus Architecture, * so we call the bus "amba". */static struct bus_type amba_bustype = {	.name		= "amba",	.match		= amba_match,	.hotplug	= amba_hotplug,	.suspend	= amba_suspend,	.resume		= amba_resume,};static int __init amba_init(void){	return bus_register(&amba_bustype);}postcore_initcall(amba_init);/* * 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;	id = amba_lookup(pcdrv->id_table, pcdev);	return pcdrv->probe(pcdev, id);}static int amba_remove(struct device *dev){	struct amba_driver *drv = to_amba_driver(dev->driver);	return drv->remove(to_amba_device(dev));}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);}#define amba_attr(name,fmt,arg...)				\static ssize_t show_##name(struct device *_dev, struct device_attribute *attr, char *buf)	\{								\	struct amba_device *dev = to_amba_device(_dev);		\	return sprintf(buf, fmt, arg);				\}								\static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)amba_attr(id, "%08x\n", dev->periphid);amba_attr(irq0, "%u\n", dev->irq[0]);amba_attr(irq1, "%u\n", dev->irq[1]);amba_attr(resource, "\t%08lx\t%08lx\t%08lx\n",	  dev->res.start, dev->res.end, dev->res.flags);/** *	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 pid, cid;	void __iomem *tmp;	int i, ret;	dev->dev.release = amba_device_release;	dev->dev.bus = &amba_bustype;	dev->dev.dma_mask = &dev->dma_mask;	dev->res.name = dev->dev.bus_id;	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 == 0) {		tmp = ioremap(dev->res.start, SZ_4K);		if (!tmp) {			ret = -ENOMEM;			goto out;		}		for (pid = 0, i = 0; i < 4; i++)			pid |= (readl(tmp + 0xfe0 + 4 * i) & 255) << (i * 8);		for (cid = 0, i = 0; i < 4; i++)			cid |= (readl(tmp + 0xff0 + 4 * i) & 255) << (i * 8);		iounmap(tmp);		if (cid == 0xb105f00d)			dev->periphid = pid;		if (dev->periphid)			ret = device_register(&dev->dev);		else			ret = -ENODEV;		if (ret == 0) {			device_create_file(&dev->dev, &dev_attr_id);			if (dev->irq[0] != NO_IRQ)				device_create_file(&dev->dev, &dev_attr_irq0);			if (dev->irq[1] != NO_IRQ)				device_create_file(&dev->dev, &dev_attr_irq1);			device_create_file(&dev->dev, &dev_attr_resource);		} else { out:			release_resource(&dev->res);		}	}	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->bus_id, 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;	if (!name)		name = dev->dev.driver->name;	if (!request_mem_region(dev->res.start, SZ_4K, 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){	release_mem_region(dev->res.start, SZ_4K);}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);