vio.c 10.7 KB
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/*
 * IBM PowerPC Virtual I/O Infrastructure Support.
 *
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 *    Copyright (c) 2003-2005 IBM Corp.
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 *     Dave Engebretsen engebret@us.ibm.com
 *     Santiago Leon santil@us.ibm.com
 *     Hollis Blanchard <hollisb@us.ibm.com>
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 *     Stephen Rothwell
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 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

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#include <linux/types.h>
#include <linux/device.h>
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#include <linux/init.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/dma-mapping.h>
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#include <linux/kobject.h>

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#include <asm/iommu.h>
#include <asm/dma.h>
#include <asm/vio.h>
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#include <asm/prom.h>
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#include <asm/firmware.h>
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#include <asm/tce.h>
#include <asm/abs_addr.h>
#include <asm/page.h>
#include <asm/hvcall.h>
#include <asm/iseries/vio.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_config.h>
#include <asm/iseries/hv_call_xm.h>
#include <asm/iseries/iommu.h>

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static struct bus_type vio_bus_type;

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static struct vio_dev vio_bus_device  = { /* fake "parent" device */
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	.name = vio_bus_device.dev.bus_id,
	.type = "",
	.dev.bus_id = "vio",
	.dev.bus = &vio_bus_type,
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};
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static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
{
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	const unsigned char *dma_window;
	struct iommu_table *tbl;
	unsigned long offset, size;

	if (firmware_has_feature(FW_FEATURE_ISERIES))
		return vio_build_iommu_table_iseries(dev);
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	dma_window = of_get_property(dev->dev.archdata.of_node,
				  "ibm,my-dma-window", NULL);
	if (!dma_window)
		return NULL;
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	tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
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	of_parse_dma_window(dev->dev.archdata.of_node, dma_window,
			    &tbl->it_index, &offset, &size);
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	/* TCE table size - measured in tce entries */
	tbl->it_size = size >> IOMMU_PAGE_SHIFT;
	/* offset for VIO should always be 0 */
	tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
	tbl->it_busno = 0;
	tbl->it_type = TCE_VB;
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	return iommu_init_table(tbl, -1);
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}
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/**
 * vio_match_device: - Tell if a VIO device has a matching
 *			VIO device id structure.
 * @ids:	array of VIO device id structures to search in
 * @dev:	the VIO device structure to match against
 *
 * Used by a driver to check whether a VIO device present in the
 * system is in its list of supported devices. Returns the matching
 * vio_device_id structure or NULL if there is no match.
 */
static const struct vio_device_id *vio_match_device(
		const struct vio_device_id *ids, const struct vio_dev *dev)
{
	while (ids->type[0] != '\0') {
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		if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
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		    of_device_is_compatible(dev->dev.archdata.of_node,
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					 ids->compat))
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			return ids;
		ids++;
	}
	return NULL;
}

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/*
 * Convert from struct device to struct vio_dev and pass to driver.
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 * dev->driver has already been set by generic code because vio_bus_match
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 * succeeded.
 */
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static int vio_bus_probe(struct device *dev)
{
	struct vio_dev *viodev = to_vio_dev(dev);
	struct vio_driver *viodrv = to_vio_driver(dev->driver);
	const struct vio_device_id *id;
	int error = -ENODEV;

	if (!viodrv->probe)
		return error;

	id = vio_match_device(viodrv->id_table, viodev);
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	if (id)
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		error = viodrv->probe(viodev, id);

	return error;
}

/* convert from struct device to struct vio_dev and pass to driver. */
static int vio_bus_remove(struct device *dev)
{
	struct vio_dev *viodev = to_vio_dev(dev);
	struct vio_driver *viodrv = to_vio_driver(dev->driver);

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	if (viodrv->remove)
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		return viodrv->remove(viodev);

	/* driver can't remove */
	return 1;
}

/**
 * vio_register_driver: - Register a new vio driver
 * @drv:	The vio_driver structure to be registered.
 */
int vio_register_driver(struct vio_driver *viodrv)
{
	printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
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		viodrv->driver.name);
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	/* fill in 'struct driver' fields */
	viodrv->driver.bus = &vio_bus_type;

	return driver_register(&viodrv->driver);
}
EXPORT_SYMBOL(vio_register_driver);

/**
 * vio_unregister_driver - Remove registration of vio driver.
 * @driver:	The vio_driver struct to be removed form registration
 */
void vio_unregister_driver(struct vio_driver *viodrv)
{
	driver_unregister(&viodrv->driver);
}
EXPORT_SYMBOL(vio_unregister_driver);

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/* vio_dev refcount hit 0 */
static void __devinit vio_dev_release(struct device *dev)
{
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	/* XXX should free TCE table */
	of_node_put(dev->archdata.of_node);
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	kfree(to_vio_dev(dev));
}

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/**
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 * vio_register_device_node: - Register a new vio device.
 * @of_node:	The OF node for this device.
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 *
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 * Creates and initializes a vio_dev structure from the data in
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 * of_node and adds it to the list of virtual devices.
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 * Returns a pointer to the created vio_dev or NULL if node has
 * NULL device_type or compatible fields.
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 */
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struct vio_dev *vio_register_device_node(struct device_node *of_node)
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{
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	struct vio_dev *viodev;
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	const unsigned int *unit_address;
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	/* we need the 'device_type' property, in order to match with drivers */
	if (of_node->type == NULL) {
		printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
				__FUNCTION__,
				of_node->name ? of_node->name : "<unknown>");
		return NULL;
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	}
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	unit_address = of_get_property(of_node, "reg", NULL);
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	if (unit_address == NULL) {
		printk(KERN_WARNING "%s: node %s missing 'reg'\n",
				__FUNCTION__,
				of_node->name ? of_node->name : "<unknown>");
		return NULL;
	}

	/* allocate a vio_dev for this node */
	viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
	if (viodev == NULL)
		return NULL;

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	viodev->irq = irq_of_parse_and_map(of_node, 0);
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	snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
	viodev->name = of_node->name;
	viodev->type = of_node->type;
	viodev->unit_address = *unit_address;
	if (firmware_has_feature(FW_FEATURE_ISERIES)) {
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		unit_address = of_get_property(of_node,
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				"linux,unit_address", NULL);
		if (unit_address != NULL)
			viodev->unit_address = *unit_address;
	}
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	viodev->dev.archdata.of_node = of_node_get(of_node);
	viodev->dev.archdata.dma_ops = &dma_iommu_ops;
	viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev);
	viodev->dev.archdata.numa_node = of_node_to_nid(of_node);
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	/* init generic 'struct device' fields: */
	viodev->dev.parent = &vio_bus_device.dev;
	viodev->dev.bus = &vio_bus_type;
	viodev->dev.release = vio_dev_release;
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	/* register with generic device framework */
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	if (device_register(&viodev->dev)) {
		printk(KERN_ERR "%s: failed to register device %s\n",
				__FUNCTION__, viodev->dev.bus_id);
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		/* XXX free TCE table */
		kfree(viodev);
		return NULL;
	}

	return viodev;
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}
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EXPORT_SYMBOL(vio_register_device_node);
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/**
 * vio_bus_init: - Initialize the virtual IO bus
 */
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static int __init vio_bus_init(void)
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{
	int err;
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	struct device_node *node_vroot;
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	err = bus_register(&vio_bus_type);
	if (err) {
		printk(KERN_ERR "failed to register VIO bus\n");
		return err;
	}

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	/*
	 * The fake parent of all vio devices, just to give us
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	 * a nice directory
	 */
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	err = device_register(&vio_bus_device.dev);
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	if (err) {
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		printk(KERN_WARNING "%s: device_register returned %i\n",
				__FUNCTION__, err);
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		return err;
	}

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	node_vroot = of_find_node_by_name(NULL, "vdevice");
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	if (node_vroot) {
		struct device_node *of_node;

		/*
		 * Create struct vio_devices for each virtual device in
		 * the device tree. Drivers will associate with them later.
		 */
		for (of_node = node_vroot->child; of_node != NULL;
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				of_node = of_node->sibling)
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			vio_register_device_node(of_node);
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		of_node_put(node_vroot);
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	}

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	return 0;
}
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__initcall(vio_bus_init);
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static ssize_t name_show(struct device *dev,
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		struct device_attribute *attr, char *buf)
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{
	return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
}
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static ssize_t devspec_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
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	struct device_node *of_node = dev->archdata.of_node;
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	return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
}

static struct device_attribute vio_dev_attrs[] = {
	__ATTR_RO(name),
	__ATTR_RO(devspec),
	__ATTR_NULL
};
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void __devinit vio_unregister_device(struct vio_dev *viodev)
{
	device_unregister(&viodev->dev);
}
EXPORT_SYMBOL(vio_unregister_device);

static int vio_bus_match(struct device *dev, struct device_driver *drv)
{
	const struct vio_dev *vio_dev = to_vio_dev(dev);
	struct vio_driver *vio_drv = to_vio_driver(drv);
	const struct vio_device_id *ids = vio_drv->id_table;

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	return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
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}

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static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
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{
	const struct vio_dev *vio_dev = to_vio_dev(dev);
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	struct device_node *dn;
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	const char *cp;
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	dn = dev->archdata.of_node;
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	if (!dn)
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		return -ENODEV;
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	cp = of_get_property(dn, "compatible", NULL);
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	if (!cp)
		return -ENODEV;

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	add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
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	return 0;
}

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static struct bus_type vio_bus_type = {
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	.name = "vio",
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	.dev_attrs = vio_dev_attrs,
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	.uevent = vio_hotplug,
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	.match = vio_bus_match,
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	.probe = vio_bus_probe,
	.remove = vio_bus_remove,
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};
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/**
 * vio_get_attribute: - get attribute for virtual device
 * @vdev:	The vio device to get property.
 * @which:	The property/attribute to be extracted.
 * @length:	Pointer to length of returned data size (unused if NULL).
 *
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 * Calls prom.c's of_get_property() to return the value of the
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 * attribute specified by @which
*/
const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
{
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	return of_get_property(vdev->dev.archdata.of_node, which, length);
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}
EXPORT_SYMBOL(vio_get_attribute);
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#ifdef CONFIG_PPC_PSERIES
/* vio_find_name() - internal because only vio.c knows how we formatted the
 * kobject name
 */
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static struct vio_dev *vio_find_name(const char *name)
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{
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	struct device *found;
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	found = bus_find_device_by_name(&vio_bus_type, NULL, name);
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	if (!found)
		return NULL;

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	return to_vio_dev(found);
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}

/**
 * vio_find_node - find an already-registered vio_dev
 * @vnode: device_node of the virtual device we're looking for
 */
struct vio_dev *vio_find_node(struct device_node *vnode)
{
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	const uint32_t *unit_address;
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	char kobj_name[BUS_ID_SIZE];

	/* construct the kobject name from the device node */
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	unit_address = of_get_property(vnode, "reg", NULL);
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	if (!unit_address)
		return NULL;
	snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);

	return vio_find_name(kobj_name);
}
EXPORT_SYMBOL(vio_find_node);

int vio_enable_interrupts(struct vio_dev *dev)
{
	int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
	if (rc != H_SUCCESS)
		printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
	return rc;
}
EXPORT_SYMBOL(vio_enable_interrupts);

int vio_disable_interrupts(struct vio_dev *dev)
{
	int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
	if (rc != H_SUCCESS)
		printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
	return rc;
}
EXPORT_SYMBOL(vio_disable_interrupts);
#endif /* CONFIG_PPC_PSERIES */