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2017-07-31Update git submodulesulik1-0/+0
* Update docs/submodules/octopus from branch 'master' - Example for MANO scenario Fixes for late comments Jira OCTO-162 Change-Id: Iefd456180f50cc3cb35828282d8669239e96b7f5 Signed-off-by: ulik <ulrich.kleber@huawei.com>
2017-07-20Update git submodulesUlrich Kleber1-0/+0
* Update docs/submodules/octopus from branch 'master' - Merge "Example for a MANO scenario" - Example for a MANO scenario Fix for comments: add juju version, delete whitespaces Patchset 3: New proposal for juju as vnfm deployment, updates according to changes of template in patch 30677/6. Patchset 4: more updates to adjust to template Patchset 5-7: fixed yamllint violations Patchset 8: Example changed to orchestra/open-baton; updates for comments Patchset 9: fix another yamllint issue Patchset 10: fix some errors relate to specifying open-baton and installers, also added some explanation. Patchset 11: another whitespace Jira OCTO-162 Change-Id: Icbf1131d702b6bdf9d0f39d4f087efd5a2cc1b06 Signed-off-by: ulik <ulrich.kleber@huawei.com>
2017-07-05Update git submodulesAric Gardner1-0/+0
* Update docs/submodules/octopus from branch 'master' - Update gsutil documentation gsutil must be installed via pip irc is a better way to grant access Change-Id: Ie2274ddc17814e8c6bf940eb988453de9e2b9fb7 Signed-off-by: Aric Gardner <agardner@linuxfoundation.org>
2017-06-29Update git submodulesUlrich Kleber1-0/+0
* Update docs/submodules/octopus from branch 'master' - Merge "Fix Yamllint Violations" - Fix Yamllint Violations The majority of these were related to comment indenting and line length. JIRA: OCTO-163 Change-Id: I14f1a2fb8f247cc84b45afa02bb01fa871f4aad5 Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>
2017-06-29Update git submodulesUlrich Kleber1-0/+0
* Update docs/submodules/octopus from branch 'master' - Merge "Revert "Maintain Octopus INFO File"" - Revert "Maintain Octopus INFO File" We haven't had chance to provide feedback for this. This reverts commit b41f1567f781aebc5fcd9c95c050978ddc95936e. Change-Id: Id991c9264f579c20cc5a9f9cc5f0808c005d2082 Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>
2017-06-27Update git submodulesUlrich Kleber1-0/+0
* Update docs/submodules/octopus from branch 'master' - Merge "Scenario Lifecycle Document - add draft for workflow chapter" - Scenario Lifecycle Document - add draft for workflow chapter 1.step: summary and first workflow for scenario owner Patchset 2: fix comment Jira OCTO-162 Signed-off-by: ulik <ulrich.kleber@huawei.com> Change-Id: I46e21c93fccc8c6f8fe08fe5ced98ca211aeea75
2017-06-22Update git submodulesUlrich Kleber1-0/+0
* Update docs/submodules/octopus from branch 'master' - Merge "Scenario Lifecycle Document - update chapter 5 Creating Scenarios" - Scenario Lifecycle Document - update chapter 5 Creating Scenarios - some clarifications - some updates from hackfest discussions - added section on scenario owners Jira OCTO-162 Signed-off-by: ulik <ulrich.kleber@huawei.com> Change-Id: I130fd2b4d17f186e7137502e32b08f4f2ae196ec
2017-06-09Update git submodulesUlrich Kleber1-0/+0
* Update docs/submodules/octopus from branch 'master' - Merge "Scenario Lifecycle Document - update chapter 8 Current Status" - Scenario Lifecycle Document - update chapter 8 Current Status - short paragraphs on early OPNFV versions and their scenarios - short summary of scenario analysis - Danube scenario tree Jira OCTO-162 Signed-off-by: ulik <ulrich.kleber@huawei.com> Change-Id: I9a05f8756cb147a9d0291daaf58ed44032021439
2017-06-09Update git submodulesUlrich Kleber1-0/+0
* Update docs/submodules/octopus from branch 'master' - Merge "Template for scenario descriptor file (sdf) and an example" - Template for scenario descriptor file (sdf) and an example Patchset 1: Initial version Patchset 2: Important comments resolved, adding info about optional/mandatory, and better syntax for hardware options. Patchset 3: Resolving comments. Some comments marked with #$$$$ where things need discussion on hackfest. Patchset 4: more comments resoved, provided alternate syntax proposal using role definitions for nodes to define ha and noha. Patchset 5: small correction Patchset 6: more comments resolved, changes discussed on hackfest done. Jira OCTO-162 Change-Id: I54e3450f04e4dcb6bc9b5efa36f2c8aa3f7617b0 Signed-off-by: ulik <ulrich.kleber@huawei.com>
2017-06-04Update git submodulesulik1-0/+0
* Update docs/submodules/octopus from branch 'master' - Maintain Octopus INFO File Remove 2 committers inactive for one year Update 2 email addresses 1 Committer stepped down Some outdated lines removed Change-Id: If54c5e9c00bc7ee27cca5b84eaae87e861e6bd99 Signed-off-by: ulik <ulrich.kleber@huawei.com>
2017-04-13Update git submodulesTim Irnich1-0/+0
* Update docs/submodules/octopus from branch 'master' - Collecting additional information from later parts into the overview to keep up with discussions so far and improving overall clarity. Change-Id: If9367e3981f4bf9638e15fcb65320f9239166cef Signed-off-by: Tim Irnich <tim.irnich@ericsson.com>
2017-03-23Updating HEAD's of submodulesShubhamRathi1-0/+0
Change-Id: Ia35eb953277876a0fb15d93d1c026dadae76972a Signed-off-by: ShubhamRathi <shubhamiiitbackup@gmail.com>
2017-03-15Updating submodules & add openretrieverShubhamRathi1-0/+0
1. HEAD seems to be out of sync for the submodules This patch fixes the HEAD so that henceforth gerrit automatically updates the refs to latest commit ID. 2. Adding openretriever to list of submodules Change-Id: I341a0a898f46cd10ccdc65ef209f76500dd3c4a6 Signed-off-by: ShubhamRathi <shubhamiiitbackup@gmail.com>
2017-01-11Add submodules and .gitmoduleShubhamRathi1-0/+0
Adding submodules of all OPNFV projects in order to create a unified repository for documentation. By using submodules we will be able to maintain a single conf.py file and theme to be used across all projects Change-Id: I65ec1a85f074f142bc335e8611e9636b5e4cb3a9 Signed-off-by: ShubhamRathi <shubhamiiitbackup@gmail.com>
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/*
 * Virtio memory mapped device driver
 *
 * Copyright 2011-2014, ARM Ltd.
 *
 * This module allows virtio devices to be used over a virtual, memory mapped
 * platform device.
 *
 * The guest device(s) may be instantiated in one of three equivalent ways:
 *
 * 1. Static platform device in board's code, eg.:
 *
 *	static struct platform_device v2m_virtio_device = {
 *		.name = "virtio-mmio",
 *		.id = -1,
 *		.num_resources = 2,
 *		.resource = (struct resource []) {
 *			{
 *				.start = 0x1001e000,
 *				.end = 0x1001e0ff,
 *				.flags = IORESOURCE_MEM,
 *			}, {
 *				.start = 42 + 32,
 *				.end = 42 + 32,
 *				.flags = IORESOURCE_IRQ,
 *			},
 *		}
 *	};
 *
 * 2. Device Tree node, eg.:
 *
 *		virtio_block@1e000 {
 *			compatible = "virtio,mmio";
 *			reg = <0x1e000 0x100>;
 *			interrupts = <42>;
 *		}
 *
 * 3. Kernel module (or command line) parameter. Can be used more than once -
 *    one device will be created for each one. Syntax:
 *
 *		[virtio_mmio.]device=<size>@<baseaddr>:<irq>[:<id>]
 *    where:
 *		<size>     := size (can use standard suffixes like K, M or G)
 *		<baseaddr> := physical base address
 *		<irq>      := interrupt number (as passed to request_irq())
 *		<id>       := (optional) platform device id
 *    eg.:
 *		virtio_mmio.device=0x100@0x100b0000:48 \
 *				virtio_mmio.device=1K@0x1001e000:74
 *
 *
 *
 * Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 */

#define pr_fmt(fmt) "virtio-mmio: " fmt

#include <linux/highmem.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_mmio.h>
#include <linux/virtio_ring.h>



/* The alignment to use between consumer and producer parts of vring.
 * Currently hardcoded to the page size. */
#define VIRTIO_MMIO_VRING_ALIGN		PAGE_SIZE



#define to_virtio_mmio_device(_plat_dev) \
	container_of(_plat_dev, struct virtio_mmio_device, vdev)

struct virtio_mmio_device {
	struct virtio_device vdev;
	struct platform_device *pdev;

	void __iomem *base;
	unsigned long version;

	/* a list of queues so we can dispatch IRQs */
	spinlock_t lock;
	struct list_head virtqueues;
};

struct virtio_mmio_vq_info {
	/* the actual virtqueue */
	struct virtqueue *vq;

	/* the number of entries in the queue */
	unsigned int num;

	/* the virtual address of the ring queue */
	void *queue;

	/* the list node for the virtqueues list */
	struct list_head node;
};



/* Configuration interface */

static u64 vm_get_features(struct virtio_device *vdev)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
	u64 features;

	writel(1, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL);
	features = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES);
	features <<= 32;

	writel(0, vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES_SEL);
	features |= readl(vm_dev->base + VIRTIO_MMIO_DEVICE_FEATURES);

	return features;
}

static int vm_finalize_features(struct virtio_device *vdev)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);

	/* Give virtio_ring a chance to accept features. */
	vring_transport_features(vdev);

	/* Make sure there is are no mixed devices */
	if (vm_dev->version == 2 &&
			!__virtio_test_bit(vdev, VIRTIO_F_VERSION_1)) {
		dev_err(&vdev->dev, "New virtio-mmio devices (version 2) must provide VIRTIO_F_VERSION_1 feature!\n");
		return -EINVAL;
	}

	writel(1, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL);
	writel((u32)(vdev->features >> 32),
			vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES);

	writel(0, vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES_SEL);
	writel((u32)vdev->features,
			vm_dev->base + VIRTIO_MMIO_DRIVER_FEATURES);

	return 0;
}

static void vm_get(struct virtio_device *vdev, unsigned offset,
		   void *buf, unsigned len)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
	void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG;
	u8 b;
	__le16 w;
	__le32 l;

	if (vm_dev->version == 1) {
		u8 *ptr = buf;
		int i;

		for (i = 0; i < len; i++)
			ptr[i] = readb(base + offset + i);
		return;
	}

	switch (len) {
	case 1:
		b = readb(base + offset);
		memcpy(buf, &b, sizeof b);
		break;
	case 2:
		w = cpu_to_le16(readw(base + offset));
		memcpy(buf, &w, sizeof w);
		break;
	case 4:
		l = cpu_to_le32(readl(base + offset));
		memcpy(buf, &l, sizeof l);
		break;
	case 8:
		l = cpu_to_le32(readl(base + offset));
		memcpy(buf, &l, sizeof l);
		l = cpu_to_le32(ioread32(base + offset + sizeof l));
		memcpy(buf + sizeof l, &l, sizeof l);
		break;
	default:
		BUG();
	}
}

static void vm_set(struct virtio_device *vdev, unsigned offset,
		   const void *buf, unsigned len)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
	void __iomem *base = vm_dev->base + VIRTIO_MMIO_CONFIG;
	u8 b;
	__le16 w;
	__le32 l;

	if (vm_dev->version == 1) {
		const u8 *ptr = buf;
		int i;

		for (i = 0; i < len; i++)
			writeb(ptr[i], base + offset + i);

		return;
	}

	switch (len) {
	case 1:
		memcpy(&b, buf, sizeof b);
		writeb(b, base + offset);
		break;
	case 2:
		memcpy(&w, buf, sizeof w);
		writew(le16_to_cpu(w), base + offset);
		break;
	case 4:
		memcpy(&l, buf, sizeof l);
		writel(le32_to_cpu(l), base + offset);
		break;
	case 8:
		memcpy(&l, buf, sizeof l);
		writel(le32_to_cpu(l), base + offset);
		memcpy(&l, buf + sizeof l, sizeof l);
		writel(le32_to_cpu(l), base + offset + sizeof l);
		break;
	default:
		BUG();
	}
}

static u32 vm_generation(struct virtio_device *vdev)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);

	if (vm_dev->version == 1)
		return 0;
	else
		return readl(vm_dev->base + VIRTIO_MMIO_CONFIG_GENERATION);
}

static u8 vm_get_status(struct virtio_device *vdev)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);

	return readl(vm_dev->base + VIRTIO_MMIO_STATUS) & 0xff;
}

static void vm_set_status(struct virtio_device *vdev, u8 status)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);

	/* We should never be setting status to 0. */
	BUG_ON(status == 0);

	writel(status, vm_dev->base + VIRTIO_MMIO_STATUS);
}

static void vm_reset(struct virtio_device *vdev)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);

	/* 0 status means a reset. */
	writel(0, vm_dev->base + VIRTIO_MMIO_STATUS);
}



/* Transport interface */

/* the notify function used when creating a virt queue */
static bool vm_notify(struct virtqueue *vq)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);

	/* We write the queue's selector into the notification register to
	 * signal the other end */
	writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
	return true;
}

/* Notify all virtqueues on an interrupt. */
static irqreturn_t vm_interrupt(int irq, void *opaque)
{
	struct virtio_mmio_device *vm_dev = opaque;
	struct virtio_mmio_vq_info *info;
	unsigned long status;
	unsigned long flags;
	irqreturn_t ret = IRQ_NONE;

	/* Read and acknowledge interrupts */
	status = readl(vm_dev->base + VIRTIO_MMIO_INTERRUPT_STATUS);
	writel(status, vm_dev->base + VIRTIO_MMIO_INTERRUPT_ACK);

	if (unlikely(status & VIRTIO_MMIO_INT_CONFIG)) {
		virtio_config_changed(&vm_dev->vdev);
		ret = IRQ_HANDLED;
	}

	if (likely(status & VIRTIO_MMIO_INT_VRING)) {
		spin_lock_irqsave(&vm_dev->lock, flags);
		list_for_each_entry(info, &vm_dev->virtqueues, node)
			ret |= vring_interrupt(irq, info->vq);
		spin_unlock_irqrestore(&vm_dev->lock, flags);
	}

	return ret;
}



static void vm_del_vq(struct virtqueue *vq)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
	struct virtio_mmio_vq_info *info = vq->priv;
	unsigned long flags, size;
	unsigned int index = vq->index;

	spin_lock_irqsave(&vm_dev->lock, flags);
	list_del(&info->node);
	spin_unlock_irqrestore(&vm_dev->lock, flags);

	vring_del_virtqueue(vq);

	/* Select and deactivate the queue */
	writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);
	if (vm_dev->version == 1) {
		writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
	} else {
		writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY);
		WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY));
	}

	size = PAGE_ALIGN(vring_size(info->num, VIRTIO_MMIO_VRING_ALIGN));
	free_pages_exact(info->queue, size);
	kfree(info);
}

static void vm_del_vqs(struct virtio_device *vdev)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
	struct virtqueue *vq, *n;

	list_for_each_entry_safe(vq, n, &vdev->vqs, list)
		vm_del_vq(vq);

	free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev);
}



static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index,
				  void (*callback)(struct virtqueue *vq),
				  const char *name)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
	struct virtio_mmio_vq_info *info;
	struct virtqueue *vq;
	unsigned long flags, size;
	int err;

	if (!name)
		return NULL;

	/* Select the queue we're interested in */
	writel(index, vm_dev->base + VIRTIO_MMIO_QUEUE_SEL);

	/* Queue shouldn't already be set up. */
	if (readl(vm_dev->base + (vm_dev->version == 1 ?
			VIRTIO_MMIO_QUEUE_PFN : VIRTIO_MMIO_QUEUE_READY))) {
		err = -ENOENT;
		goto error_available;
	}

	/* Allocate and fill out our active queue description */
	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info) {
		err = -ENOMEM;
		goto error_kmalloc;
	}

	/* Allocate pages for the queue - start with a queue as big as
	 * possible (limited by maximum size allowed by device), drop down
	 * to a minimal size, just big enough to fit descriptor table
	 * and two rings (which makes it "alignment_size * 2")
	 */
	info->num = readl(vm_dev->base + VIRTIO_MMIO_QUEUE_NUM_MAX);

	/* If the device reports a 0 entry queue, we won't be able to
	 * use it to perform I/O, and vring_new_virtqueue() can't create
	 * empty queues anyway, so don't bother to set up the device.
	 */
	if (info->num == 0) {
		err = -ENOENT;
		goto error_alloc_pages;
	}

	while (1) {
		size = PAGE_ALIGN(vring_size(info->num,
				VIRTIO_MMIO_VRING_ALIGN));
		/* Did the last iter shrink the queue below minimum size? */
		if (size < VIRTIO_MMIO_VRING_ALIGN * 2) {
			err = -ENOMEM;
			goto error_alloc_pages;
		}

		info->queue = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
		if (info->queue)
			break;

		info->num /= 2;
	}

	/* Create the vring */
	vq = vring_new_virtqueue(index, info->num, VIRTIO_MMIO_VRING_ALIGN, vdev,
				 true, info->queue, vm_notify, callback, name);
	if (!vq) {
		err = -ENOMEM;
		goto error_new_virtqueue;
	}

	/* Activate the queue */
	writel(info->num, vm_dev->base + VIRTIO_MMIO_QUEUE_NUM);
	if (vm_dev->version == 1) {
		writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_QUEUE_ALIGN);
		writel(virt_to_phys(info->queue) >> PAGE_SHIFT,
				vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
	} else {
		u64 addr;

		addr = virt_to_phys(info->queue);
		writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_LOW);
		writel((u32)(addr >> 32),
				vm_dev->base + VIRTIO_MMIO_QUEUE_DESC_HIGH);

		addr = virt_to_phys(virtqueue_get_avail(vq));
		writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_LOW);
		writel((u32)(addr >> 32),
				vm_dev->base + VIRTIO_MMIO_QUEUE_AVAIL_HIGH);

		addr = virt_to_phys(virtqueue_get_used(vq));
		writel((u32)addr, vm_dev->base + VIRTIO_MMIO_QUEUE_USED_LOW);
		writel((u32)(addr >> 32),
				vm_dev->base + VIRTIO_MMIO_QUEUE_USED_HIGH);

		writel(1, vm_dev->base + VIRTIO_MMIO_QUEUE_READY);
	}

	vq->priv = info;
	info->vq = vq;

	spin_lock_irqsave(&vm_dev->lock, flags);
	list_add(&info->node, &vm_dev->virtqueues);
	spin_unlock_irqrestore(&vm_dev->lock, flags);

	return vq;

error_new_virtqueue:
	if (vm_dev->version == 1) {
		writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
	} else {
		writel(0, vm_dev->base + VIRTIO_MMIO_QUEUE_READY);
		WARN_ON(readl(vm_dev->base + VIRTIO_MMIO_QUEUE_READY));
	}
	free_pages_exact(info->queue, size);
error_alloc_pages:
	kfree(info);
error_kmalloc:
error_available:
	return ERR_PTR(err);
}

static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
		       struct virtqueue *vqs[],
		       vq_callback_t *callbacks[],
		       const char *names[])
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
	unsigned int irq = platform_get_irq(vm_dev->pdev, 0);
	int i, err;

	err = request_irq(irq, vm_interrupt, IRQF_SHARED,
			dev_name(&vdev->dev), vm_dev);
	if (err)
		return err;

	for (i = 0; i < nvqs; ++i) {
		vqs[i] = vm_setup_vq(vdev, i, callbacks[i], names[i]);
		if (IS_ERR(vqs[i])) {
			vm_del_vqs(vdev);
			return PTR_ERR(vqs[i]);
		}
	}

	return 0;
}

static const char *vm_bus_name(struct virtio_device *vdev)
{
	struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);

	return vm_dev->pdev->name;
}

static const struct virtio_config_ops virtio_mmio_config_ops = {
	.get		= vm_get,
	.set		= vm_set,
	.generation	= vm_generation,
	.get_status	= vm_get_status,
	.set_status	= vm_set_status,
	.reset		= vm_reset,
	.find_vqs	= vm_find_vqs,
	.del_vqs	= vm_del_vqs,
	.get_features	= vm_get_features,
	.finalize_features = vm_finalize_features,
	.bus_name	= vm_bus_name,
};



/* Platform device */

static int virtio_mmio_probe(struct platform_device *pdev)
{
	struct virtio_mmio_device *vm_dev;
	struct resource *mem;
	unsigned long magic;

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem)
		return -EINVAL;

	if (!devm_request_mem_region(&pdev->dev, mem->start,
			resource_size(mem), pdev->name))
		return -EBUSY;

	vm_dev = devm_kzalloc(&pdev->dev, sizeof(*vm_dev), GFP_KERNEL);
	if (!vm_dev)
		return  -ENOMEM;

	vm_dev->vdev.dev.parent = &pdev->dev;
	vm_dev->vdev.config = &virtio_mmio_config_ops;
	vm_dev->pdev = pdev;
	INIT_LIST_HEAD(&vm_dev->virtqueues);
	spin_lock_init(&vm_dev->lock);

	vm_dev->base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
	if (vm_dev->base == NULL)
		return -EFAULT;

	/* Check magic value */
	magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE);
	if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) {
		dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic);
		return -ENODEV;
	}

	/* Check device version */
	vm_dev->version = readl(vm_dev->base + VIRTIO_MMIO_VERSION);
	if (vm_dev->version < 1 || vm_dev->version > 2) {
		dev_err(&pdev->dev, "Version %ld not supported!\n",
				vm_dev->version);
		return -ENXIO;
	}

	vm_dev->vdev.id.device = readl(vm_dev->base + VIRTIO_MMIO_DEVICE_ID);
	if (vm_dev->vdev.id.device == 0) {
		/*
		 * virtio-mmio device with an ID 0 is a (dummy) placeholder
		 * with no function. End probing now with no error reported.
		 */
		return -ENODEV;
	}
	vm_dev->vdev.id.vendor = readl(vm_dev->base + VIRTIO_MMIO_VENDOR_ID);

	if (vm_dev->version == 1)
		writel(PAGE_SIZE, vm_dev->base + VIRTIO_MMIO_GUEST_PAGE_SIZE);

	platform_set_drvdata(pdev, vm_dev);

	return register_virtio_device(&vm_dev->vdev);
}

static int virtio_mmio_remove(struct platform_device *pdev)
{
	struct virtio_mmio_device *vm_dev = platform_get_drvdata(pdev);

	unregister_virtio_device(&vm_dev->vdev);

	return 0;
}



/* Devices list parameter */

#if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES)

static struct device vm_cmdline_parent = {
	.init_name = "virtio-mmio-cmdline",
};

static int vm_cmdline_parent_registered;
static int vm_cmdline_id;

static int vm_cmdline_set(const char *device,
		const struct kernel_param *kp)
{
	int err;
	struct resource resources[2] = {};
	char *str;
	long long int base, size;
	unsigned int irq;
	int processed, consumed = 0;
	struct platform_device *pdev;

	/* Consume "size" part of the command line parameter */
	size = memparse(device, &str);

	/* Get "@<base>:<irq>[:<id>]" chunks */
	processed = sscanf(str, "@%lli:%u%n:%d%n",
			&base, &irq, &consumed,
			&vm_cmdline_id, &consumed);

	/*
	 * sscanf() must processes at least 2 chunks; also there
	 * must be no extra characters after the last chunk, so
	 * str[consumed] must be '\0'
	 */
	if (processed < 2 || str[consumed])
		return -EINVAL;

	resources[0].flags = IORESOURCE_MEM;
	resources[0].start = base;
	resources[0].end = base + size - 1;

	resources[1].flags = IORESOURCE_IRQ;
	resources[1].start = resources[1].end = irq;

	if (!vm_cmdline_parent_registered) {
		err = device_register(&vm_cmdline_parent);
		if (err) {
			pr_err("Failed to register parent device!\n");
			return err;
		}
		vm_cmdline_parent_registered = 1;
	}

	pr_info("Registering device virtio-mmio.%d at 0x%llx-0x%llx, IRQ %d.\n",
		       vm_cmdline_id,
		       (unsigned long long)resources[0].start,
		       (unsigned long long)resources[0].end,
		       (int)resources[1].start);

	pdev = platform_device_register_resndata(&vm_cmdline_parent,
			"virtio-mmio", vm_cmdline_id++,
			resources, ARRAY_SIZE(resources), NULL, 0);
	if (IS_ERR(pdev))
		return PTR_ERR(pdev);

	return 0;
}

static int vm_cmdline_get_device(struct device *dev, void *data)
{
	char *buffer = data;
	unsigned int len = strlen(buffer);
	struct platform_device *pdev = to_platform_device(dev);

	snprintf(buffer + len, PAGE_SIZE - len, "0x%llx@0x%llx:%llu:%d\n",
			pdev->resource[0].end - pdev->resource[0].start + 1ULL,
			(unsigned long long)pdev->resource[0].start,
			(unsigned long long)pdev->resource[1].start,
			pdev->id);
	return 0;
}

static int vm_cmdline_get(char *buffer, const struct kernel_param *kp)
{
	buffer[0] = '\0';
	device_for_each_child(&vm_cmdline_parent, buffer,
			vm_cmdline_get_device);
	return strlen(buffer) + 1;
}

static struct kernel_param_ops vm_cmdline_param_ops = {
	.set = vm_cmdline_set,
	.get = vm_cmdline_get,
};

device_param_cb(device, &vm_cmdline_param_ops, NULL, S_IRUSR);

static int vm_unregister_cmdline_device(struct device *dev,
		void *data)
{
	platform_device_unregister(to_platform_device(dev));

	return 0;
}

static void vm_unregister_cmdline_devices(void)
{
	if (vm_cmdline_parent_registered) {
		device_for_each_child(&vm_cmdline_parent, NULL,
				vm_unregister_cmdline_device);
		device_unregister(&vm_cmdline_parent);
		vm_cmdline_parent_registered = 0;
	}
}

#else

static void vm_unregister_cmdline_devices(void)
{
}

#endif

/* Platform driver */

static struct of_device_id virtio_mmio_match[] = {
	{ .compatible = "virtio,mmio", },
	{},
};
MODULE_DEVICE_TABLE(of, virtio_mmio_match);

static struct platform_driver virtio_mmio_driver = {
	.probe		= virtio_mmio_probe,
	.remove		= virtio_mmio_remove,
	.driver		= {
		.name	= "virtio-mmio",
		.of_match_table	= virtio_mmio_match,
	},
};

static int __init virtio_mmio_init(void)
{
	return platform_driver_register(&virtio_mmio_driver);
}

static void __exit virtio_mmio_exit(void)
{
	platform_driver_unregister(&virtio_mmio_driver);
	vm_unregister_cmdline_devices();
}

module_init(virtio_mmio_init);
module_exit(virtio_mmio_exit);

MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
MODULE_DESCRIPTION("Platform bus driver for memory mapped virtio devices");
MODULE_LICENSE("GPL");