[deliverable/linux.git] / arch / sparc64 / kernel / vio.c

/* vio.c: Virtual I/O channel devices probing infrastructure.
 *
 *    Copyright (c) 2003-2005 IBM Corp.
 *     Dave Engebretsen engebret@us.ibm.com
 *     Santiago Leon santil@us.ibm.com
 *     Hollis Blanchard <hollisb@us.ibm.com>
 *     Stephen Rothwell
 *
 * Adapted to sparc64 by David S. Miller davem@davemloft.net
 */

#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/init.h>

#include <asm/mdesc.h>
#include <asm/vio.h>

static inline int find_in_proplist(const char *list, const char *match,
				   int len)
{
	while (len > 0) {
		int l;

		if (!strcmp(list, match))
			return 1;
		l = strlen(list) + 1;
		list += l;
		len -= l;
	}
	return 0;
}

static const struct vio_device_id *vio_match_device(
	const struct vio_device_id *matches,
	const struct vio_dev *dev)
{
	const char *type, *compat;
	int len;

	type = dev->type;
	compat = dev->compat;
	len = dev->compat_len;

	while (matches->type[0] || matches->compat[0]) {
		int match = 1;
		if (matches->type[0])
			match &= !strcmp(matches->type, type);

		if (matches->compat[0]) {
			match &= len &&
				find_in_proplist(compat, matches->compat, len);
		}
		if (match)
			return matches;
		matches++;
	}
	return NULL;
}

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

	if (!matches)
		return 0;

	return vio_match_device(matches, vio_dev) != NULL;
}

static int vio_device_probe(struct device *dev)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	struct vio_driver *drv = to_vio_driver(dev->driver);
	const struct vio_device_id *id;
	int error = -ENODEV;

	if (drv->probe) {
		id = vio_match_device(drv->id_table, vdev);
		if (id)
			error = drv->probe(vdev, id);
	}

	return error;
}

static int vio_device_remove(struct device *dev)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	struct vio_driver *drv = to_vio_driver(dev->driver);

	if (drv->remove)
		return drv->remove(vdev);

	return 1;
}

static ssize_t devspec_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	const char *str = "none";

	if (!strcmp(vdev->type, "network"))
		str = "vnet";
	else if (!strcmp(vdev->type, "block"))
		str = "vdisk";

	return sprintf(buf, "%s\n", str);
}

static ssize_t type_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct vio_dev *vdev = to_vio_dev(dev);
	return sprintf(buf, "%s\n", vdev->type);
}

static struct device_attribute vio_dev_attrs[] = {
	__ATTR_RO(devspec),
	__ATTR_RO(type),
	__ATTR_NULL
};

static struct bus_type vio_bus_type = {
	.name		= "vio",
	.dev_attrs	= vio_dev_attrs,
	.match		= vio_bus_match,
	.probe		= vio_device_probe,
	.remove		= vio_device_remove,
};

int vio_register_driver(struct vio_driver *viodrv)
{
	viodrv->driver.bus = &vio_bus_type;

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

void vio_unregister_driver(struct vio_driver *viodrv)
{
	driver_unregister(&viodrv->driver);
}
EXPORT_SYMBOL(vio_unregister_driver);

static void __devinit vio_dev_release(struct device *dev)
{
	kfree(to_vio_dev(dev));
}

static ssize_t
show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct vio_dev *vdev;
	struct device_node *dp;

	vdev = to_vio_dev(dev);
	dp = vdev->dp;

	return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
}

static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
		   show_pciobppath_attr, NULL);

struct device_node *cdev_node;

static struct vio_dev *root_vdev;
static u64 cdev_cfg_handle;

static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
				  struct vio_dev *vdev)
{
	u64 a;

	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
		const u64 *chan_id;
		const u64 *irq;
		u64 target;

		target = mdesc_arc_target(hp, a);

		irq = mdesc_get_property(hp, target, "tx-ino", NULL);
		if (irq)
			vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);

		irq = mdesc_get_property(hp, target, "rx-ino", NULL);
		if (irq)
			vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);

		chan_id = mdesc_get_property(hp, target, "id", NULL);
		if (chan_id)
			vdev->channel_id = *chan_id;
	}
}

static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
				      struct device *parent)
{
	const char *type, *compat, *bus_id_name;
	struct device_node *dp;
	struct vio_dev *vdev;
	int err, tlen, clen;
	const u64 *id;

	type = mdesc_get_property(hp, mp, "device-type", &tlen);
	if (!type) {
		type = mdesc_get_property(hp, mp, "name", &tlen);
		if (!type) {
			type = mdesc_node_name(hp, mp);
			tlen = strlen(type) + 1;
		}
	}
	if (tlen > VIO_MAX_TYPE_LEN) {
		printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
		       type);
		return NULL;
	}

	bus_id_name = type;
	if (!strcmp(type, "domain-services-port"))
		bus_id_name = "ds";

	if (strlen(bus_id_name) >= KOBJ_NAME_LEN - 4) {
		printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
		       bus_id_name);
		return NULL;
	}

	compat = mdesc_get_property(hp, mp, "device-type", &clen);
	if (!compat) {
		clen = 0;
	} else if (clen > VIO_MAX_COMPAT_LEN) {
		printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
		       clen, type);
		return NULL;
	}

	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	if (!vdev) {
		printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
		return NULL;
	}

	vdev->mp = mp;
	memcpy(vdev->type, type, tlen);
	if (compat)
		memcpy(vdev->compat, compat, clen);
	else
		memset(vdev->compat, 0, sizeof(vdev->compat));
	vdev->compat_len = clen;

	vdev->channel_id = ~0UL;
	vdev->tx_irq = ~0;
	vdev->rx_irq = ~0;

	vio_fill_channel_info(hp, mp, vdev);

	id = mdesc_get_property(hp, mp, "id", NULL);
	if (!id)
		snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s",
			 bus_id_name);
	else
		snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu",
			 bus_id_name, *id);

	vdev->dev.parent = parent;
	vdev->dev.bus = &vio_bus_type;
	vdev->dev.release = vio_dev_release;

	if (parent == NULL) {
		dp = cdev_node;
	} else if (to_vio_dev(parent) == root_vdev) {
		dp = of_get_next_child(cdev_node, NULL);
		while (dp) {
			if (!strcmp(dp->type, type))
				break;

			dp = of_get_next_child(cdev_node, dp);
		}
	} else {
		dp = to_vio_dev(parent)->dp;
	}
	vdev->dp = dp;

	printk(KERN_ERR "VIO: Adding device %s\n", vdev->dev.bus_id);

	err = device_register(&vdev->dev);
	if (err) {
		printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
		       vdev->dev.bus_id, err);
		kfree(vdev);
		return NULL;
	}
	if (vdev->dp)
		err = sysfs_create_file(&vdev->dev.kobj,
					&dev_attr_obppath.attr);

	return vdev;
}

static void vio_add(struct mdesc_handle *hp, u64 node)
{
	(void) vio_create_one(hp, node, &root_vdev->dev);
}

static int vio_md_node_match(struct device *dev, void *arg)
{
	struct vio_dev *vdev = to_vio_dev(dev);

	if (vdev->mp == (u64) arg)
		return 1;

	return 0;
}

static void vio_remove(struct mdesc_handle *hp, u64 node)
{
	struct device *dev;

	dev = device_find_child(&root_vdev->dev, (void *) node,
				vio_md_node_match);
	if (dev) {
		printk(KERN_INFO "VIO: Removing device %s\n", dev->bus_id);

		device_unregister(dev);
	}
}

static struct mdesc_notifier_client vio_device_notifier = {
	.add		= vio_add,
	.remove		= vio_remove,
	.node_name	= "virtual-device-port",
};

static struct mdesc_notifier_client vio_ds_notifier = {
	.add		= vio_add,
	.remove		= vio_remove,
	.node_name	= "domain-services-port",
};

const char *channel_devices_node = "channel-devices";
const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
const char *cfg_handle_prop = "cfg-handle";

static int __init vio_init(void)
{
	struct mdesc_handle *hp;
	const char *compat;
	const u64 *cfg_handle;
	int err, len;
	u64 root;

	err = bus_register(&vio_bus_type);
	if (err) {
		printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
		       err);
		return err;
	}

	hp = mdesc_grab();
	if (!hp)
		return 0;

	root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
	if (root == MDESC_NODE_NULL) {
		printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
		mdesc_release(hp);
		return 0;
	}

	cdev_node = of_find_node_by_name(NULL, "channel-devices");
	err = -ENODEV;
	if (!cdev_node) {
		printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
		goto out_release;
	}

	compat = mdesc_get_property(hp, root, "compatible", &len);
	if (!compat) {
		printk(KERN_ERR "VIO: Channel devices lacks compatible "
		       "property\n");
		goto out_release;
	}
	if (!find_in_proplist(compat, channel_devices_compat, len)) {
		printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
		       "compat entry.\n", channel_devices_compat);
		goto out_release;
	}

	cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
	if (!cfg_handle) {
		printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
		       cfg_handle_prop);
		goto out_release;
	}

	cdev_cfg_handle = *cfg_handle;

	root_vdev = vio_create_one(hp, root, NULL);
	err = -ENODEV;
	if (!root_vdev) {
		printk(KERN_ERR "VIO: Coult not create root device.\n");
		goto out_release;
	}

	mdesc_register_notifier(&vio_device_notifier);
	mdesc_register_notifier(&vio_ds_notifier);

	mdesc_release(hp);

	return err;

out_release:
	mdesc_release(hp);
	return err;
}

postcore_initcall(vio_init);
Commit	Line	Data
e53e97ce DM	1	/* vio.c: Virtual I/O channel devices probing infrastructure.
	2	*
	3	* Copyright (c) 2003-2005 IBM Corp.
	4	* Dave Engebretsen engebret@us.ibm.com
	5	* Santiago Leon santil@us.ibm.com
	6	* Hollis Blanchard <hollisb@us.ibm.com>
	7	* Stephen Rothwell
	8	*
	9	* Adapted to sparc64 by David S. Miller davem@davemloft.net
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/irq.h>
	14	#include <linux/init.h>
	15
	16	#include <asm/mdesc.h>
	17	#include <asm/vio.h>
	18
	19	static inline int find_in_proplist(const char list, const char match,
	20	int len)
	21	{
	22	while (len > 0) {
	23	int l;
	24
	25	if (!strcmp(list, match))
	26	return 1;
	27	l = strlen(list) + 1;
	28	list += l;
	29	len -= l;
	30	}
	31	return 0;
	32	}
	33
	34	static const struct vio_device_id *vio_match_device(
	35	const struct vio_device_id *matches,
	36	const struct vio_dev *dev)
	37	{
	38	const char type, compat;
	39	int len;
	40
	41	type = dev->type;
	42	compat = dev->compat;
	43	len = dev->compat_len;
	44
	45	while (matches->type[0] \|\| matches->compat[0]) {
	46	int match = 1;
83292e0a DM	47	if (matches->type[0])
	48	match &= !strcmp(matches->type, type);
	49
e53e97ce	50	if (matches->compat[0]) {
83292e0a	51	match &= len &&
e53e97ce DM	52	find_in_proplist(compat, matches->compat, len);
	53	}
	54	if (match)
	55	return matches;
	56	matches++;
	57	}
	58	return NULL;
	59	}
	60
	61	static int vio_bus_match(struct device dev, struct device_driver drv)
	62	{
	63	struct vio_dev *vio_dev = to_vio_dev(dev);
	64	struct vio_driver *vio_drv = to_vio_driver(drv);
	65	const struct vio_device_id *matches = vio_drv->id_table;
	66
	67	if (!matches)
	68	return 0;
	69
	70	return vio_match_device(matches, vio_dev) != NULL;
	71	}
	72
	73	static int vio_device_probe(struct device *dev)
	74	{
	75	struct vio_dev *vdev = to_vio_dev(dev);
	76	struct vio_driver *drv = to_vio_driver(dev->driver);
	77	const struct vio_device_id *id;
	78	int error = -ENODEV;
	79
	80	if (drv->probe) {
	81	id = vio_match_device(drv->id_table, vdev);
	82	if (id)
	83	error = drv->probe(vdev, id);
	84	}
	85
	86	return error;
	87	}
	88
	89	static int vio_device_remove(struct device *dev)
	90	{
	91	struct vio_dev *vdev = to_vio_dev(dev);
	92	struct vio_driver *drv = to_vio_driver(dev->driver);
	93
	94	if (drv->remove)
	95	return drv->remove(vdev);
	96
	97	return 1;
	98	}
	99
	100	static ssize_t devspec_show(struct device *dev,
	101	struct device_attribute attr, char buf)
	102	{
	103	struct vio_dev *vdev = to_vio_dev(dev);
	104	const char *str = "none";
	105
2c4f4ecb DM	106	if (!strcmp(vdev->type, "network"))
	107	str = "vnet";
	108	else if (!strcmp(vdev->type, "block"))
	109	str = "vdisk";
e53e97ce DM	110
	111	return sprintf(buf, "%s\n", str);
	112	}
	113
2c4f4ecb DM	114	static ssize_t type_show(struct device *dev,
	115	struct device_attribute attr, char buf)
	116	{
	117	struct vio_dev *vdev = to_vio_dev(dev);
	118	return sprintf(buf, "%s\n", vdev->type);
	119	}
	120
e53e97ce DM	121	static struct device_attribute vio_dev_attrs[] = {
e53e97ce DM	122	__ATTR_RO(devspec),
2c4f4ecb	123	__ATTR_RO(type),
e53e97ce DM	124	__ATTR_NULL
	125	};
	126
	127	static struct bus_type vio_bus_type = {
	128	.name = "vio",
	129	.dev_attrs = vio_dev_attrs,
	130	.match = vio_bus_match,
	131	.probe = vio_device_probe,
	132	.remove = vio_device_remove,
	133	};
	134
	135	int vio_register_driver(struct vio_driver *viodrv)
	136	{
	137	viodrv->driver.bus = &vio_bus_type;
	138
	139	return driver_register(&viodrv->driver);
	140	}
	141	EXPORT_SYMBOL(vio_register_driver);
	142
	143	void vio_unregister_driver(struct vio_driver *viodrv)
	144	{
	145	driver_unregister(&viodrv->driver);
	146	}
	147	EXPORT_SYMBOL(vio_unregister_driver);
	148
e53e97ce DM	149	static void __devinit vio_dev_release(struct device *dev)
	150	{
	151	kfree(to_vio_dev(dev));
	152	}
	153
	154	static ssize_t
	155	show_pciobppath_attr(struct device dev, struct device_attribute attr,
	156	char *buf)
	157	{
	158	struct vio_dev *vdev;
	159	struct device_node *dp;
	160
	161	vdev = to_vio_dev(dev);
	162	dp = vdev->dp;
	163
	164	return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
	165	}
	166
	167	static DEVICE_ATTR(obppath, S_IRUSR \| S_IRGRP \| S_IROTH,
	168	show_pciobppath_attr, NULL);
	169
	170	struct device_node *cdev_node;
	171
	172	static struct vio_dev *root_vdev;
	173	static u64 cdev_cfg_handle;
	174
43fdf274 DM	175	static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
	176	struct vio_dev *vdev)
	177	{
	178	u64 a;
	179
	180	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
	181	const u64 *chan_id;
	182	const u64 *irq;
	183	u64 target;
	184
	185	target = mdesc_arc_target(hp, a);
	186
	187	irq = mdesc_get_property(hp, target, "tx-ino", NULL);
	188	if (irq)
	189	vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
	190
	191	irq = mdesc_get_property(hp, target, "rx-ino", NULL);
	192	if (irq)
	193	vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
	194
	195	chan_id = mdesc_get_property(hp, target, "id", NULL);
	196	if (chan_id)
	197	vdev->channel_id = *chan_id;
	198	}
	199	}
	200
	201	static struct vio_dev vio_create_one(struct mdesc_handle hp, u64 mp,
e53e97ce DM	202	struct device *parent)
e53e97ce DM	203	{
6160f635	204	const char type, compat, *bus_id_name;
e53e97ce DM	205	struct device_node *dp;
e53e97ce DM	206	struct vio_dev *vdev;
83292e0a	207	int err, tlen, clen;
6160f635	208	const u64 *id;
e53e97ce	209
83292e0a	210	type = mdesc_get_property(hp, mp, "device-type", &tlen);
2c4f4ecb	211	if (!type) {
83292e0a DM	212	type = mdesc_get_property(hp, mp, "name", &tlen);
83292e0a DM	213	if (!type) {
43fdf274	214	type = mdesc_node_name(hp, mp);
83292e0a DM	215	tlen = strlen(type) + 1;
	216	}
	217	}
	218	if (tlen > VIO_MAX_TYPE_LEN) {
	219	printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
	220	type);
	221	return NULL;
2c4f4ecb	222	}
83292e0a	223
6160f635 DM	224	bus_id_name = type;
	225	if (!strcmp(type, "domain-services-port"))
	226	bus_id_name = "ds";
	227
	228	if (strlen(bus_id_name) >= KOBJ_NAME_LEN - 4) {
	229	printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
	230	bus_id_name);
	231	return NULL;
	232	}
	233
43fdf274	234	compat = mdesc_get_property(hp, mp, "device-type", &clen);
83292e0a DM	235	if (!compat) {
	236	clen = 0;
	237	} else if (clen > VIO_MAX_COMPAT_LEN) {
	238	printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
	239	clen, type);
	240	return NULL;
	241	}
e53e97ce DM	242
	243	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	244	if (!vdev) {
	245	printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
	246	return NULL;
	247	}
	248
	249	vdev->mp = mp;
83292e0a DM	250	memcpy(vdev->type, type, tlen);
	251	if (compat)
	252	memcpy(vdev->compat, compat, clen);
	253	else
	254	memset(vdev->compat, 0, sizeof(vdev->compat));
e53e97ce DM	255	vdev->compat_len = clen;
e53e97ce DM	256
43fdf274 DM	257	vdev->channel_id = ~0UL;
	258	vdev->tx_irq = ~0;
	259	vdev->rx_irq = ~0;
e53e97ce	260
43fdf274	261	vio_fill_channel_info(hp, mp, vdev);
e53e97ce	262
6160f635 DM	263	id = mdesc_get_property(hp, mp, "id", NULL);
	264	if (!id)
	265	snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s",
	266	bus_id_name);
	267	else
	268	snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu",
	269	bus_id_name, *id);
	270
e53e97ce DM	271	vdev->dev.parent = parent;
	272	vdev->dev.bus = &vio_bus_type;
	273	vdev->dev.release = vio_dev_release;
	274
	275	if (parent == NULL) {
	276	dp = cdev_node;
	277	} else if (to_vio_dev(parent) == root_vdev) {
	278	dp = of_get_next_child(cdev_node, NULL);
	279	while (dp) {
	280	if (!strcmp(dp->type, type))
	281	break;
	282
	283	dp = of_get_next_child(cdev_node, dp);
	284	}
	285	} else {
	286	dp = to_vio_dev(parent)->dp;
	287	}
	288	vdev->dp = dp;
	289
6160f635 DM	290	printk(KERN_ERR "VIO: Adding device %s\n", vdev->dev.bus_id);
6160f635 DM	291
e53e97ce DM	292	err = device_register(&vdev->dev);
	293	if (err) {
	294	printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
	295	vdev->dev.bus_id, err);
	296	kfree(vdev);
	297	return NULL;
	298	}
	299	if (vdev->dp)
	300	err = sysfs_create_file(&vdev->dev.kobj,
	301	&dev_attr_obppath.attr);
	302
	303	return vdev;
	304	}
	305
6160f635	306	static void vio_add(struct mdesc_handle *hp, u64 node)
e53e97ce	307	{
6160f635	308	(void) vio_create_one(hp, node, &root_vdev->dev);
e53e97ce DM	309	}
e53e97ce DM	310
6160f635	311	static int vio_md_node_match(struct device dev, void arg)
e53e97ce	312	{
6160f635	313	struct vio_dev *vdev = to_vio_dev(dev);
2c4f4ecb	314
6160f635 DM	315	if (vdev->mp == (u64) arg)
6160f635 DM	316	return 1;
e53e97ce	317
6160f635 DM	318	return 0;
6160f635 DM	319	}
2c4f4ecb	320
6160f635 DM	321	static void vio_remove(struct mdesc_handle *hp, u64 node)
	322	{
	323	struct device *dev;
2c4f4ecb	324
6160f635 DM	325	dev = device_find_child(&root_vdev->dev, (void *) node,
	326	vio_md_node_match);
	327	if (dev) {
	328	printk(KERN_INFO "VIO: Removing device %s\n", dev->bus_id);
	329
	330	device_unregister(dev);
2c4f4ecb	331	}
e53e97ce DM	332	}
e53e97ce DM	333
6160f635 DM	334	static struct mdesc_notifier_client vio_device_notifier = {
	335	.add = vio_add,
	336	.remove = vio_remove,
	337	.node_name = "virtual-device-port",
	338	};
	339
	340	static struct mdesc_notifier_client vio_ds_notifier = {
	341	.add = vio_add,
	342	.remove = vio_remove,
	343	.node_name = "domain-services-port",
	344	};
	345
e53e97ce DM	346	const char *channel_devices_node = "channel-devices";
	347	const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
	348	const char *cfg_handle_prop = "cfg-handle";
	349
	350	static int __init vio_init(void)
	351	{
43fdf274	352	struct mdesc_handle *hp;
e53e97ce DM	353	const char *compat;
	354	const u64 *cfg_handle;
	355	int err, len;
43fdf274 DM	356	u64 root;
43fdf274 DM	357
f8be339c DM	358	err = bus_register(&vio_bus_type);
	359	if (err) {
	360	printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
	361	err);
	362	return err;
	363	}
	364
43fdf274 DM	365	hp = mdesc_grab();
	366	if (!hp)
	367	return 0;
e53e97ce	368
43fdf274 DM	369	root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
43fdf274 DM	370	if (root == MDESC_NODE_NULL) {
e53e97ce	371	printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
43fdf274	372	mdesc_release(hp);
e53e97ce DM	373	return 0;
	374	}
	375
	376	cdev_node = of_find_node_by_name(NULL, "channel-devices");
43fdf274	377	err = -ENODEV;
e53e97ce DM	378	if (!cdev_node) {
e53e97ce DM	379	printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
43fdf274	380	goto out_release;
e53e97ce DM	381	}
e53e97ce DM	382
43fdf274	383	compat = mdesc_get_property(hp, root, "compatible", &len);
e53e97ce DM	384	if (!compat) {
	385	printk(KERN_ERR "VIO: Channel devices lacks compatible "
	386	"property\n");
43fdf274	387	goto out_release;
e53e97ce DM	388	}
	389	if (!find_in_proplist(compat, channel_devices_compat, len)) {
	390	printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
	391	"compat entry.\n", channel_devices_compat);
43fdf274	392	goto out_release;
e53e97ce DM	393	}
e53e97ce DM	394
43fdf274	395	cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
e53e97ce DM	396	if (!cfg_handle) {
	397	printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
	398	cfg_handle_prop);
43fdf274	399	goto out_release;
e53e97ce DM	400	}
	401
	402	cdev_cfg_handle = *cfg_handle;
	403
6160f635 DM	404	root_vdev = vio_create_one(hp, root, NULL);
	405	err = -ENODEV;
	406	if (!root_vdev) {
	407	printk(KERN_ERR "VIO: Coult not create root device.\n");
	408	goto out_release;
	409	}
	410
920c3ed7 DM	411	mdesc_register_notifier(&vio_device_notifier);
	412	mdesc_register_notifier(&vio_ds_notifier);
	413
43fdf274	414	mdesc_release(hp);
e53e97ce	415
6160f635	416	return err;
43fdf274 DM	417
	418	out_release:
	419	mdesc_release(hp);
	420	return err;
e53e97ce DM	421	}
	422
	423	postcore_initcall(vio_init);