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/*

 *  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/amba/bus.h>

#include <asm/io.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);

/*

 * 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);

}

/**

 *      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)

                goto err_out;

        tmp = ioremap(dev->res.start, SZ_4K);

        if (!tmp) {

                ret = -ENOMEM;

                goto err_release;

        }

        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 = -ENODEV;

                goto err_release;

        }

        ret = device_register(&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->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);