diff --git a/drivers/base/platform.c b/drivers/base/platform.c
new file mode 100644
index 0000000..996cbb4
--- /dev/null
+++ b/drivers/base/platform.c
@@ -0,0 +1,350 @@
+/*
+ * platform.c - platform 'pseudo' bus for legacy devices
+ *
+ * Copyright (c) 2002-3 Patrick Mochel
+ * Copyright (c) 2002-3 Open Source Development Labs
+ *
+ * This file is released under the GPLv2
+ *
+ * Please see Documentation/driver-model/platform.txt for more
+ * information.
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/bootmem.h>
+#include <linux/err.h>
+
+struct device platform_bus = {
+	.bus_id		= "platform",
+};
+
+/**
+ *	platform_get_resource - get a resource for a device
+ *	@dev: platform device
+ *	@type: resource type
+ *	@num: resource index
+ */
+struct resource *
+platform_get_resource(struct platform_device *dev, unsigned int type,
+		      unsigned int num)
+{
+	int i;
+
+	for (i = 0; i < dev->num_resources; i++) {
+		struct resource *r = &dev->resource[i];
+
+		if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|
+				 IORESOURCE_IRQ|IORESOURCE_DMA))
+		    == type)
+			if (num-- == 0)
+				return r;
+	}
+	return NULL;
+}
+
+/**
+ *	platform_get_irq - get an IRQ for a device
+ *	@dev: platform device
+ *	@num: IRQ number index
+ */
+int platform_get_irq(struct platform_device *dev, unsigned int num)
+{
+	struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
+
+	return r ? r->start : 0;
+}
+
+/**
+ *	platform_get_resource_byname - get a resource for a device by name
+ *	@dev: platform device
+ *	@type: resource type
+ *	@name: resource name
+ */
+struct resource *
+platform_get_resource_byname(struct platform_device *dev, unsigned int type,
+		      char *name)
+{
+	int i;
+
+	for (i = 0; i < dev->num_resources; i++) {
+		struct resource *r = &dev->resource[i];
+
+		if ((r->flags & (IORESOURCE_IO|IORESOURCE_MEM|
+				 IORESOURCE_IRQ|IORESOURCE_DMA)) == type)
+			if (!strcmp(r->name, name))
+				return r;
+	}
+	return NULL;
+}
+
+/**
+ *	platform_get_irq - get an IRQ for a device
+ *	@dev: platform device
+ *	@name: IRQ name
+ */
+int platform_get_irq_byname(struct platform_device *dev, char *name)
+{
+	struct resource *r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
+
+	return r ? r->start : 0;
+}
+
+/**
+ *	platform_add_devices - add a numbers of platform devices
+ *	@devs: array of platform devices to add
+ *	@num: number of platform devices in array
+ */
+int platform_add_devices(struct platform_device **devs, int num)
+{
+	int i, ret = 0;
+
+	for (i = 0; i < num; i++) {
+		ret = platform_device_register(devs[i]);
+		if (ret) {
+			while (--i >= 0)
+				platform_device_unregister(devs[i]);
+			break;
+		}
+	}
+
+	return ret;
+}
+
+/**
+ *	platform_device_register - add a platform-level device
+ *	@dev:	platform device we're adding
+ *
+ */
+int platform_device_register(struct platform_device * pdev)
+{
+	int i, ret = 0;
+
+	if (!pdev)
+		return -EINVAL;
+
+	if (!pdev->dev.parent)
+		pdev->dev.parent = &platform_bus;
+
+	pdev->dev.bus = &platform_bus_type;
+
+	if (pdev->id != -1)
+		snprintf(pdev->dev.bus_id, BUS_ID_SIZE, "%s.%u", pdev->name, pdev->id);
+	else
+		strlcpy(pdev->dev.bus_id, pdev->name, BUS_ID_SIZE);
+
+	for (i = 0; i < pdev->num_resources; i++) {
+		struct resource *p, *r = &pdev->resource[i];
+
+		if (r->name == NULL)
+			r->name = pdev->dev.bus_id;
+
+		p = r->parent;
+		if (!p) {
+			if (r->flags & IORESOURCE_MEM)
+				p = &iomem_resource;
+			else if (r->flags & IORESOURCE_IO)
+				p = &ioport_resource;
+		}
+
+		if (p && request_resource(p, r)) {
+			printk(KERN_ERR
+			       "%s: failed to claim resource %d\n",
+			       pdev->dev.bus_id, i);
+			ret = -EBUSY;
+			goto failed;
+		}
+	}
+
+	pr_debug("Registering platform device '%s'. Parent at %s\n",
+		 pdev->dev.bus_id, pdev->dev.parent->bus_id);
+
+	ret = device_register(&pdev->dev);
+	if (ret == 0)
+		return ret;
+
+ failed:
+	while (--i >= 0)
+		if (pdev->resource[i].flags & (IORESOURCE_MEM|IORESOURCE_IO))
+			release_resource(&pdev->resource[i]);
+	return ret;
+}
+
+/**
+ *	platform_device_unregister - remove a platform-level device
+ *	@dev:	platform device we're removing
+ *
+ *	Note that this function will also release all memory- and port-based
+ *	resources owned by the device (@dev->resource).
+ */
+void platform_device_unregister(struct platform_device * pdev)
+{
+	int i;
+
+	if (pdev) {
+		for (i = 0; i < pdev->num_resources; i++) {
+			struct resource *r = &pdev->resource[i];
+			if (r->flags & (IORESOURCE_MEM|IORESOURCE_IO))
+				release_resource(r);
+		}
+
+		device_unregister(&pdev->dev);
+	}
+}
+
+struct platform_object {
+        struct platform_device pdev;
+        struct resource resources[0];
+};
+
+static void platform_device_release_simple(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	kfree(container_of(pdev, struct platform_object, pdev));
+}
+
+/**
+ *	platform_device_register_simple
+ *	@name:  base name of the device we're adding
+ *	@id:    instance id
+ *	@res:   set of resources that needs to be allocated for the device
+ *	@num:	number of resources
+ *
+ *	This function creates a simple platform device that requires minimal
+ *	resource and memory management. Canned release function freeing
+ *	memory allocated for the device allows drivers using such devices
+ *	to be unloaded iwithout waiting for the last reference to the device
+ *	to be dropped.
+ */
+struct platform_device *platform_device_register_simple(char *name, unsigned int id,
+							struct resource *res, unsigned int num)
+{
+	struct platform_object *pobj;
+	int retval;
+
+	pobj = kmalloc(sizeof(struct platform_object) + sizeof(struct resource) * num, GFP_KERNEL);
+	if (!pobj) {
+		retval = -ENOMEM;
+		goto error;
+	}
+
+	memset(pobj, 0, sizeof(*pobj));
+	pobj->pdev.name = name;
+	pobj->pdev.id = id;
+	pobj->pdev.dev.release = platform_device_release_simple;
+
+	if (num) {
+		memcpy(pobj->resources, res, sizeof(struct resource) * num);
+		pobj->pdev.resource = pobj->resources;
+		pobj->pdev.num_resources = num;
+	}
+
+	retval = platform_device_register(&pobj->pdev);
+	if (retval)
+		goto error;
+
+	return &pobj->pdev;
+
+error:
+	kfree(pobj);
+	return ERR_PTR(retval);
+}
+
+
+/**
+ *	platform_match - bind platform device to platform driver.
+ *	@dev:	device.
+ *	@drv:	driver.
+ *
+ *	Platform device IDs are assumed to be encoded like this:
+ *	"<name><instance>", where <name> is a short description of the
+ *	type of device, like "pci" or "floppy", and <instance> is the
+ *	enumerated instance of the device, like '0' or '42'.
+ *	Driver IDs are simply "<name>".
+ *	So, extract the <name> from the platform_device structure,
+ *	and compare it against the name of the driver. Return whether
+ *	they match or not.
+ */
+
+static int platform_match(struct device * dev, struct device_driver * drv)
+{
+	struct platform_device *pdev = container_of(dev, struct platform_device, dev);
+
+	return (strncmp(pdev->name, drv->name, BUS_ID_SIZE) == 0);
+}
+
+static int platform_suspend(struct device * dev, pm_message_t state)
+{
+	int ret = 0;
+
+	if (dev->driver && dev->driver->suspend) {
+		ret = dev->driver->suspend(dev, state, SUSPEND_DISABLE);
+		if (ret == 0)
+			ret = dev->driver->suspend(dev, state, SUSPEND_SAVE_STATE);
+		if (ret == 0)
+			ret = dev->driver->suspend(dev, state, SUSPEND_POWER_DOWN);
+	}
+	return ret;
+}
+
+static int platform_resume(struct device * dev)
+{
+	int ret = 0;
+
+	if (dev->driver && dev->driver->resume) {
+		ret = dev->driver->resume(dev, RESUME_POWER_ON);
+		if (ret == 0)
+			ret = dev->driver->resume(dev, RESUME_RESTORE_STATE);
+		if (ret == 0)
+			ret = dev->driver->resume(dev, RESUME_ENABLE);
+	}
+	return ret;
+}
+
+struct bus_type platform_bus_type = {
+	.name		= "platform",
+	.match		= platform_match,
+	.suspend	= platform_suspend,
+	.resume		= platform_resume,
+};
+
+int __init platform_bus_init(void)
+{
+	device_register(&platform_bus);
+	return bus_register(&platform_bus_type);
+}
+
+#ifndef ARCH_HAS_DMA_GET_REQUIRED_MASK
+u64 dma_get_required_mask(struct device *dev)
+{
+	u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
+	u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
+	u64 mask;
+
+	if (!high_totalram) {
+		/* convert to mask just covering totalram */
+		low_totalram = (1 << (fls(low_totalram) - 1));
+		low_totalram += low_totalram - 1;
+		mask = low_totalram;
+	} else {
+		high_totalram = (1 << (fls(high_totalram) - 1));
+		high_totalram += high_totalram - 1;
+		mask = (((u64)high_totalram) << 32) + 0xffffffff;
+	}
+	return mask & *dev->dma_mask;
+}
+EXPORT_SYMBOL_GPL(dma_get_required_mask);
+#endif
+
+EXPORT_SYMBOL_GPL(platform_bus);
+EXPORT_SYMBOL_GPL(platform_bus_type);
+EXPORT_SYMBOL_GPL(platform_device_register);
+EXPORT_SYMBOL_GPL(platform_device_register_simple);
+EXPORT_SYMBOL_GPL(platform_device_unregister);
+EXPORT_SYMBOL_GPL(platform_get_irq);
+EXPORT_SYMBOL_GPL(platform_get_resource);
+EXPORT_SYMBOL_GPL(platform_get_irq_byname);
+EXPORT_SYMBOL_GPL(platform_get_resource_byname);