[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / sparc / 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/slab.h>
#include <linux/irq.h>
#include <linux/init.h>

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

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 &&
				of_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, "vnet-port"))
		str = "vnet";
	else if (!strcmp(vdev->type, "vdc-port"))
		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 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);

static 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, *cfg_handle;
	u64 a;

	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;
	}

	id = mdesc_get_property(hp, mp, "id", NULL);

	cfg_handle = NULL;
	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
		u64 target;

		target = mdesc_arc_target(hp, a);
		cfg_handle = mdesc_get_property(hp, target,
						"cfg-handle", NULL);
		if (cfg_handle)
			break;
	}

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

	/*
	 * 20 char is the old driver-core name size limit, which is no more.
	 * This check can probably be removed after review and possible
	 * adaption of the vio users name length handling.
	 */
	if (strlen(bus_id_name) >= 20 - 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);

	if (!id) {
		dev_set_name(&vdev->dev, "%s", bus_id_name);
		vdev->dev_no = ~(u64)0;
	} else if (!cfg_handle) {
		dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
		vdev->dev_no = *id;
	} else {
		dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
			     *cfg_handle, *id);
		vdev->dev_no = *cfg_handle;
	}

	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_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));

	err = device_register(&vdev->dev);
	if (err) {
		printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
		       dev_name(&vdev->dev), 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_name(dev));

		device_unregister(dev);
	}
}

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

/* We are only interested in domain service ports under the
 * "domain-services" node.  On control nodes there is another port
 * under "openboot" that we should not mess with as aparently that is
 * reserved exclusively for OBP use.
 */
static void vio_add_ds(struct mdesc_handle *hp, u64 node)
{
	int found;
	u64 a;

	found = 0;
	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
		u64 target = mdesc_arc_target(hp, a);
		const char *name = mdesc_node_name(hp, target);

		if (!strcmp(name, "domain-services")) {
			found = 1;
			break;
		}
	}

	if (found)
		(void) vio_create_one(hp, node, &root_vdev->dev);
}

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

static const char *channel_devices_node = "channel-devices";
static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
static 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 (!of_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>
5a0e3ad6	13	#include <linux/slab.h>
e53e97ce DM	14	#include <linux/irq.h>
	15	#include <linux/init.h>
	16
	17	#include <asm/mdesc.h>
	18	#include <asm/vio.h>
	19
e53e97ce DM	20	static const struct vio_device_id *vio_match_device(
	21	const struct vio_device_id *matches,
	22	const struct vio_dev *dev)
	23	{
	24	const char type, compat;
	25	int len;
	26
	27	type = dev->type;
	28	compat = dev->compat;
	29	len = dev->compat_len;
	30
	31	while (matches->type[0] \|\| matches->compat[0]) {
	32	int match = 1;
83292e0a DM	33	if (matches->type[0])
	34	match &= !strcmp(matches->type, type);
	35
e53e97ce	36	if (matches->compat[0]) {
83292e0a	37	match &= len &&
46bcea77	38	of_find_in_proplist(compat, matches->compat, len);
e53e97ce DM	39	}
	40	if (match)
	41	return matches;
	42	matches++;
	43	}
	44	return NULL;
	45	}
	46
	47	static int vio_bus_match(struct device dev, struct device_driver drv)
	48	{
	49	struct vio_dev *vio_dev = to_vio_dev(dev);
	50	struct vio_driver *vio_drv = to_vio_driver(drv);
	51	const struct vio_device_id *matches = vio_drv->id_table;
	52
	53	if (!matches)
	54	return 0;
	55
	56	return vio_match_device(matches, vio_dev) != NULL;
	57	}
	58
	59	static int vio_device_probe(struct device *dev)
	60	{
	61	struct vio_dev *vdev = to_vio_dev(dev);
	62	struct vio_driver *drv = to_vio_driver(dev->driver);
	63	const struct vio_device_id *id;
	64	int error = -ENODEV;
	65
	66	if (drv->probe) {
	67	id = vio_match_device(drv->id_table, vdev);
	68	if (id)
	69	error = drv->probe(vdev, id);
	70	}
	71
	72	return error;
	73	}
	74
	75	static int vio_device_remove(struct device *dev)
	76	{
	77	struct vio_dev *vdev = to_vio_dev(dev);
	78	struct vio_driver *drv = to_vio_driver(dev->driver);
	79
	80	if (drv->remove)
	81	return drv->remove(vdev);
	82
	83	return 1;
	84	}
	85
	86	static ssize_t devspec_show(struct device *dev,
	87	struct device_attribute attr, char buf)
	88	{
	89	struct vio_dev *vdev = to_vio_dev(dev);
	90	const char *str = "none";
	91
48db7b7c	92	if (!strcmp(vdev->type, "vnet-port"))
2c4f4ecb	93	str = "vnet";
48db7b7c	94	else if (!strcmp(vdev->type, "vdc-port"))
2c4f4ecb	95	str = "vdisk";
e53e97ce DM	96
	97	return sprintf(buf, "%s\n", str);
	98	}
	99
2c4f4ecb DM	100	static ssize_t type_show(struct device *dev,
	101	struct device_attribute attr, char buf)
	102	{
	103	struct vio_dev *vdev = to_vio_dev(dev);
	104	return sprintf(buf, "%s\n", vdev->type);
	105	}
	106
e53e97ce DM	107	static struct device_attribute vio_dev_attrs[] = {
e53e97ce DM	108	__ATTR_RO(devspec),
2c4f4ecb	109	__ATTR_RO(type),
e53e97ce DM	110	__ATTR_NULL
	111	};
	112
	113	static struct bus_type vio_bus_type = {
	114	.name = "vio",
	115	.dev_attrs = vio_dev_attrs,
	116	.match = vio_bus_match,
	117	.probe = vio_device_probe,
	118	.remove = vio_device_remove,
	119	};
	120
	121	int vio_register_driver(struct vio_driver *viodrv)
	122	{
	123	viodrv->driver.bus = &vio_bus_type;
	124
	125	return driver_register(&viodrv->driver);
	126	}
	127	EXPORT_SYMBOL(vio_register_driver);
	128
	129	void vio_unregister_driver(struct vio_driver *viodrv)
	130	{
	131	driver_unregister(&viodrv->driver);
	132	}
	133	EXPORT_SYMBOL(vio_unregister_driver);
	134
a1f35ba3	135	static void vio_dev_release(struct device *dev)
e53e97ce DM	136	{
	137	kfree(to_vio_dev(dev));
	138	}
	139
	140	static ssize_t
	141	show_pciobppath_attr(struct device dev, struct device_attribute attr,
	142	char *buf)
	143	{
	144	struct vio_dev *vdev;
	145	struct device_node *dp;
	146
	147	vdev = to_vio_dev(dev);
	148	dp = vdev->dp;
	149
	150	return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
	151	}
	152
	153	static DEVICE_ATTR(obppath, S_IRUSR \| S_IRGRP \| S_IROTH,
	154	show_pciobppath_attr, NULL);
	155
7694b024	156	static struct device_node *cdev_node;
e53e97ce DM	157
	158	static struct vio_dev *root_vdev;
	159	static u64 cdev_cfg_handle;
	160
43fdf274 DM	161	static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
	162	struct vio_dev *vdev)
	163	{
	164	u64 a;
	165
	166	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
	167	const u64 *chan_id;
	168	const u64 *irq;
	169	u64 target;
	170
	171	target = mdesc_arc_target(hp, a);
	172
	173	irq = mdesc_get_property(hp, target, "tx-ino", NULL);
	174	if (irq)
	175	vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
	176
	177	irq = mdesc_get_property(hp, target, "rx-ino", NULL);
	178	if (irq)
	179	vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
	180
	181	chan_id = mdesc_get_property(hp, target, "id", NULL);
	182	if (chan_id)
	183	vdev->channel_id = *chan_id;
	184	}
	185	}
	186
	187	static struct vio_dev vio_create_one(struct mdesc_handle hp, u64 mp,
e53e97ce DM	188	struct device *parent)
e53e97ce DM	189	{
6160f635	190	const char type, compat, *bus_id_name;
e53e97ce DM	191	struct device_node *dp;
e53e97ce DM	192	struct vio_dev *vdev;
83292e0a	193	int err, tlen, clen;
58fb6666 DM	194	const u64 id, cfg_handle;
58fb6666 DM	195	u64 a;
e53e97ce	196
83292e0a	197	type = mdesc_get_property(hp, mp, "device-type", &tlen);
2c4f4ecb	198	if (!type) {
83292e0a DM	199	type = mdesc_get_property(hp, mp, "name", &tlen);
83292e0a DM	200	if (!type) {
43fdf274	201	type = mdesc_node_name(hp, mp);
83292e0a DM	202	tlen = strlen(type) + 1;
	203	}
	204	}
	205	if (tlen > VIO_MAX_TYPE_LEN) {
	206	printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
	207	type);
	208	return NULL;
2c4f4ecb	209	}
83292e0a	210
58fb6666	211	id = mdesc_get_property(hp, mp, "id", NULL);
91ba3c21	212
58fb6666 DM	213	cfg_handle = NULL;
	214	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
	215	u64 target;
91ba3c21	216
58fb6666 DM	217	target = mdesc_arc_target(hp, a);
58fb6666 DM	218	cfg_handle = mdesc_get_property(hp, target,
91ba3c21	219	"cfg-handle", NULL);
58fb6666 DM	220	if (cfg_handle)
	221	break;
	222	}
91ba3c21	223
6160f635 DM	224	bus_id_name = type;
	225	if (!strcmp(type, "domain-services-port"))
	226	bus_id_name = "ds";
	227
08f42877 KS	228	/*
	229	* 20 char is the old driver-core name size limit, which is no more.
	230	* This check can probably be removed after review and possible
	231	* adaption of the vio users name length handling.
	232	*/
	233	if (strlen(bus_id_name) >= 20 - 4) {
6160f635 DM	234	printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
	235	bus_id_name);
	236	return NULL;
	237	}
	238
43fdf274	239	compat = mdesc_get_property(hp, mp, "device-type", &clen);
83292e0a DM	240	if (!compat) {
	241	clen = 0;
	242	} else if (clen > VIO_MAX_COMPAT_LEN) {
	243	printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
	244	clen, type);
	245	return NULL;
	246	}
e53e97ce DM	247
	248	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	249	if (!vdev) {
	250	printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
	251	return NULL;
	252	}
	253
	254	vdev->mp = mp;
83292e0a DM	255	memcpy(vdev->type, type, tlen);
	256	if (compat)
	257	memcpy(vdev->compat, compat, clen);
	258	else
	259	memset(vdev->compat, 0, sizeof(vdev->compat));
e53e97ce DM	260	vdev->compat_len = clen;
e53e97ce DM	261
43fdf274 DM	262	vdev->channel_id = ~0UL;
	263	vdev->tx_irq = ~0;
	264	vdev->rx_irq = ~0;
e53e97ce	265
43fdf274	266	vio_fill_channel_info(hp, mp, vdev);
e53e97ce	267
91ba3c21	268	if (!id) {
2222c313	269	dev_set_name(&vdev->dev, "%s", bus_id_name);
91ba3c21	270	vdev->dev_no = ~(u64)0;
58fb6666	271	} else if (!cfg_handle) {
90181136	272	dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
91ba3c21	273	vdev->dev_no = *id;
58fb6666	274	} else {
90181136	275	dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
2222c313	276	cfg_handle, id);
58fb6666	277	vdev->dev_no = *cfg_handle;
91ba3c21	278	}
6160f635	279
e53e97ce DM	280	vdev->dev.parent = parent;
	281	vdev->dev.bus = &vio_bus_type;
	282	vdev->dev.release = vio_dev_release;
	283
	284	if (parent == NULL) {
	285	dp = cdev_node;
	286	} else if (to_vio_dev(parent) == root_vdev) {
	287	dp = of_get_next_child(cdev_node, NULL);
	288	while (dp) {
	289	if (!strcmp(dp->type, type))
	290	break;
	291
	292	dp = of_get_next_child(cdev_node, dp);
	293	}
	294	} else {
	295	dp = to_vio_dev(parent)->dp;
	296	}
	297	vdev->dp = dp;
	298
2222c313	299	printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
6160f635	300
e53e97ce DM	301	err = device_register(&vdev->dev);
	302	if (err) {
	303	printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
2222c313	304	dev_name(&vdev->dev), err);
e53e97ce DM	305	kfree(vdev);
	306	return NULL;
	307	}
	308	if (vdev->dp)
	309	err = sysfs_create_file(&vdev->dev.kobj,
	310	&dev_attr_obppath.attr);
	311
	312	return vdev;
	313	}
	314
6160f635	315	static void vio_add(struct mdesc_handle *hp, u64 node)
e53e97ce	316	{
6160f635	317	(void) vio_create_one(hp, node, &root_vdev->dev);
e53e97ce DM	318	}
e53e97ce DM	319
6160f635	320	static int vio_md_node_match(struct device dev, void arg)
e53e97ce	321	{
6160f635	322	struct vio_dev *vdev = to_vio_dev(dev);
2c4f4ecb	323
6160f635 DM	324	if (vdev->mp == (u64) arg)
6160f635 DM	325	return 1;
e53e97ce	326
6160f635 DM	327	return 0;
6160f635 DM	328	}
2c4f4ecb	329
6160f635 DM	330	static void vio_remove(struct mdesc_handle *hp, u64 node)
	331	{
	332	struct device *dev;
2c4f4ecb	333
6160f635 DM	334	dev = device_find_child(&root_vdev->dev, (void *) node,
	335	vio_md_node_match);
	336	if (dev) {
2222c313	337	printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
6160f635 DM	338
6160f635 DM	339	device_unregister(dev);
2c4f4ecb	340	}
e53e97ce DM	341	}
e53e97ce DM	342
6160f635 DM	343	static struct mdesc_notifier_client vio_device_notifier = {
	344	.add = vio_add,
	345	.remove = vio_remove,
	346	.node_name = "virtual-device-port",
	347	};
	348
07607c54 DM	349	/* We are only interested in domain service ports under the
	350	* "domain-services" node. On control nodes there is another port
	351	* under "openboot" that we should not mess with as aparently that is
	352	* reserved exclusively for OBP use.
	353	*/
	354	static void vio_add_ds(struct mdesc_handle *hp, u64 node)
	355	{
	356	int found;
	357	u64 a;
	358
	359	found = 0;
	360	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
	361	u64 target = mdesc_arc_target(hp, a);
	362	const char *name = mdesc_node_name(hp, target);
	363
	364	if (!strcmp(name, "domain-services")) {
	365	found = 1;
	366	break;
	367	}
	368	}
	369
	370	if (found)
	371	(void) vio_create_one(hp, node, &root_vdev->dev);
	372	}
	373
6160f635	374	static struct mdesc_notifier_client vio_ds_notifier = {
07607c54	375	.add = vio_add_ds,
6160f635 DM	376	.remove = vio_remove,
	377	.node_name = "domain-services-port",
	378	};
	379
7694b024 DM	380	static const char *channel_devices_node = "channel-devices";
	381	static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
	382	static const char *cfg_handle_prop = "cfg-handle";
e53e97ce DM	383
	384	static int __init vio_init(void)
	385	{
43fdf274	386	struct mdesc_handle *hp;
e53e97ce DM	387	const char *compat;
	388	const u64 *cfg_handle;
	389	int err, len;
43fdf274 DM	390	u64 root;
43fdf274 DM	391
f8be339c DM	392	err = bus_register(&vio_bus_type);
	393	if (err) {
	394	printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
	395	err);
	396	return err;
	397	}
	398
43fdf274 DM	399	hp = mdesc_grab();
	400	if (!hp)
	401	return 0;
e53e97ce	402
43fdf274 DM	403	root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
43fdf274 DM	404	if (root == MDESC_NODE_NULL) {
e53e97ce	405	printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
43fdf274	406	mdesc_release(hp);
e53e97ce DM	407	return 0;
	408	}
	409
	410	cdev_node = of_find_node_by_name(NULL, "channel-devices");
43fdf274	411	err = -ENODEV;
e53e97ce DM	412	if (!cdev_node) {
e53e97ce DM	413	printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
43fdf274	414	goto out_release;
e53e97ce DM	415	}
e53e97ce DM	416
43fdf274	417	compat = mdesc_get_property(hp, root, "compatible", &len);
e53e97ce DM	418	if (!compat) {
	419	printk(KERN_ERR "VIO: Channel devices lacks compatible "
	420	"property\n");
43fdf274	421	goto out_release;
e53e97ce	422	}
46bcea77	423	if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
e53e97ce DM	424	printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
e53e97ce DM	425	"compat entry.\n", channel_devices_compat);
43fdf274	426	goto out_release;
e53e97ce DM	427	}
e53e97ce DM	428
43fdf274	429	cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
e53e97ce DM	430	if (!cfg_handle) {
	431	printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
	432	cfg_handle_prop);
43fdf274	433	goto out_release;
e53e97ce DM	434	}
	435
	436	cdev_cfg_handle = *cfg_handle;
	437
6160f635 DM	438	root_vdev = vio_create_one(hp, root, NULL);
	439	err = -ENODEV;
	440	if (!root_vdev) {
	441	printk(KERN_ERR "VIO: Coult not create root device.\n");
	442	goto out_release;
	443	}
	444
920c3ed7 DM	445	mdesc_register_notifier(&vio_device_notifier);
	446	mdesc_register_notifier(&vio_ds_notifier);
	447
43fdf274	448	mdesc_release(hp);
e53e97ce	449
6160f635	450	return err;
43fdf274 DM	451
	452	out_release:
	453	mdesc_release(hp);
	454	return err;
e53e97ce DM	455	}
	456
	457	postcore_initcall(vio_init);