[linux-2.6-block.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/export.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_hotplug(struct device *dev, struct kobj_uevent_env *env)
{
	const struct vio_dev *vio_dev = to_vio_dev(dev);

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

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 ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	const struct vio_dev *vdev = to_vio_dev(dev);

	return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
}

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

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

int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
			const char *mod_name)
{
	viodrv->driver.bus = &vio_bus_type;
	viodrv->driver.name = viodrv->name;
	viodrv->driver.owner = owner;
	viodrv->driver.mod_name = mod_name;

	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);
			vdev->rx_ino = *irq;
		}

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

int vio_set_intr(unsigned long dev_ino, int state)
{
	int err;

	err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
	return err;
}
EXPORT_SYMBOL(vio_set_intr);

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);
		put_device(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: Could 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	14	#include <linux/irq.h>
7b64db60	15	#include <linux/export.h>
e53e97ce DM	16	#include <linux/init.h>
	17
	18	#include <asm/mdesc.h>
	19	#include <asm/vio.h>
	20
e53e97ce DM	21	static const struct vio_device_id *vio_match_device(
	22	const struct vio_device_id *matches,
	23	const struct vio_dev *dev)
	24	{
	25	const char type, compat;
	26	int len;
	27
	28	type = dev->type;
	29	compat = dev->compat;
	30	len = dev->compat_len;
	31
	32	while (matches->type[0] \|\| matches->compat[0]) {
	33	int match = 1;
83292e0a DM	34	if (matches->type[0])
	35	match &= !strcmp(matches->type, type);
	36
e53e97ce	37	if (matches->compat[0]) {
83292e0a	38	match &= len &&
46bcea77	39	of_find_in_proplist(compat, matches->compat, len);
e53e97ce DM	40	}
	41	if (match)
	42	return matches;
	43	matches++;
	44	}
	45	return NULL;
	46	}
	47
5bde2c9b AG	48	static int vio_hotplug(struct device dev, struct kobj_uevent_env env)
	49	{
	50	const struct vio_dev *vio_dev = to_vio_dev(dev);
	51
	52	add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
	53	return 0;
	54	}
	55
e53e97ce DM	56	static int vio_bus_match(struct device dev, struct device_driver drv)
	57	{
	58	struct vio_dev *vio_dev = to_vio_dev(dev);
	59	struct vio_driver *vio_drv = to_vio_driver(drv);
	60	const struct vio_device_id *matches = vio_drv->id_table;
	61
	62	if (!matches)
	63	return 0;
	64
	65	return vio_match_device(matches, vio_dev) != NULL;
	66	}
	67
	68	static int vio_device_probe(struct device *dev)
	69	{
	70	struct vio_dev *vdev = to_vio_dev(dev);
	71	struct vio_driver *drv = to_vio_driver(dev->driver);
	72	const struct vio_device_id *id;
	73	int error = -ENODEV;
	74
	75	if (drv->probe) {
	76	id = vio_match_device(drv->id_table, vdev);
	77	if (id)
	78	error = drv->probe(vdev, id);
	79	}
	80
	81	return error;
	82	}
	83
	84	static int vio_device_remove(struct device *dev)
	85	{
	86	struct vio_dev *vdev = to_vio_dev(dev);
	87	struct vio_driver *drv = to_vio_driver(dev->driver);
	88
	89	if (drv->remove)
	90	return drv->remove(vdev);
	91
	92	return 1;
	93	}
	94
	95	static ssize_t devspec_show(struct device *dev,
	96	struct device_attribute attr, char buf)
	97	{
	98	struct vio_dev *vdev = to_vio_dev(dev);
	99	const char *str = "none";
	100
48db7b7c	101	if (!strcmp(vdev->type, "vnet-port"))
2c4f4ecb	102	str = "vnet";
48db7b7c	103	else if (!strcmp(vdev->type, "vdc-port"))
2c4f4ecb	104	str = "vdisk";
e53e97ce DM	105
	106	return sprintf(buf, "%s\n", str);
	107	}
	108
2c4f4ecb DM	109	static ssize_t type_show(struct device *dev,
	110	struct device_attribute attr, char buf)
	111	{
	112	struct vio_dev *vdev = to_vio_dev(dev);
	113	return sprintf(buf, "%s\n", vdev->type);
	114	}
	115
36128d20 AG	116	static ssize_t modalias_show(struct device dev, struct device_attribute attr,
	117	char *buf)
	118	{
	119	const struct vio_dev *vdev = to_vio_dev(dev);
	120
	121	return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
	122	}
	123
e53e97ce DM	124	static struct device_attribute vio_dev_attrs[] = {
e53e97ce DM	125	__ATTR_RO(devspec),
2c4f4ecb	126	__ATTR_RO(type),
36128d20	127	__ATTR_RO(modalias),
e53e97ce DM	128	__ATTR_NULL
	129	};
	130
	131	static struct bus_type vio_bus_type = {
	132	.name = "vio",
	133	.dev_attrs = vio_dev_attrs,
5bde2c9b	134	.uevent = vio_hotplug,
e53e97ce DM	135	.match = vio_bus_match,
	136	.probe = vio_device_probe,
	137	.remove = vio_device_remove,
	138	};
	139
cb52d897 BH	140	int __vio_register_driver(struct vio_driver viodrv, struct module owner,
cb52d897 BH	141	const char *mod_name)
e53e97ce DM	142	{
e53e97ce DM	143	viodrv->driver.bus = &vio_bus_type;
cb52d897 BH	144	viodrv->driver.name = viodrv->name;
	145	viodrv->driver.owner = owner;
	146	viodrv->driver.mod_name = mod_name;
e53e97ce DM	147
	148	return driver_register(&viodrv->driver);
	149	}
cb52d897	150	EXPORT_SYMBOL(__vio_register_driver);
e53e97ce DM	151
	152	void vio_unregister_driver(struct vio_driver *viodrv)
	153	{
	154	driver_unregister(&viodrv->driver);
	155	}
	156	EXPORT_SYMBOL(vio_unregister_driver);
	157
a1f35ba3	158	static void vio_dev_release(struct device *dev)
e53e97ce DM	159	{
	160	kfree(to_vio_dev(dev));
	161	}
	162
	163	static ssize_t
	164	show_pciobppath_attr(struct device dev, struct device_attribute attr,
	165	char *buf)
	166	{
	167	struct vio_dev *vdev;
	168	struct device_node *dp;
	169
	170	vdev = to_vio_dev(dev);
	171	dp = vdev->dp;
	172
	173	return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
	174	}
	175
	176	static DEVICE_ATTR(obppath, S_IRUSR \| S_IRGRP \| S_IROTH,
	177	show_pciobppath_attr, NULL);
	178
7694b024	179	static struct device_node *cdev_node;
e53e97ce DM	180
	181	static struct vio_dev *root_vdev;
	182	static u64 cdev_cfg_handle;
	183
43fdf274 DM	184	static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
	185	struct vio_dev *vdev)
	186	{
	187	u64 a;
	188
	189	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
	190	const u64 *chan_id;
	191	const u64 *irq;
	192	u64 target;
	193
	194	target = mdesc_arc_target(hp, a);
	195
	196	irq = mdesc_get_property(hp, target, "tx-ino", NULL);
	197	if (irq)
	198	vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
	199
	200	irq = mdesc_get_property(hp, target, "rx-ino", NULL);
ca605b7d	201	if (irq) {
43fdf274	202	vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
ca605b7d SV	203	vdev->rx_ino = *irq;
ca605b7d SV	204	}
43fdf274 DM	205
	206	chan_id = mdesc_get_property(hp, target, "id", NULL);
	207	if (chan_id)
	208	vdev->channel_id = *chan_id;
	209	}
	210	}
	211
ca605b7d SV	212	int vio_set_intr(unsigned long dev_ino, int state)
	213	{
	214	int err;
	215
	216	err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
	217	return err;
	218	}
	219	EXPORT_SYMBOL(vio_set_intr);
	220
43fdf274	221	static struct vio_dev vio_create_one(struct mdesc_handle hp, u64 mp,
e53e97ce DM	222	struct device *parent)
e53e97ce DM	223	{
6160f635	224	const char type, compat, *bus_id_name;
e53e97ce DM	225	struct device_node *dp;
e53e97ce DM	226	struct vio_dev *vdev;
83292e0a	227	int err, tlen, clen;
58fb6666 DM	228	const u64 id, cfg_handle;
58fb6666 DM	229	u64 a;
e53e97ce	230
83292e0a	231	type = mdesc_get_property(hp, mp, "device-type", &tlen);
2c4f4ecb	232	if (!type) {
83292e0a DM	233	type = mdesc_get_property(hp, mp, "name", &tlen);
83292e0a DM	234	if (!type) {
43fdf274	235	type = mdesc_node_name(hp, mp);
83292e0a DM	236	tlen = strlen(type) + 1;
	237	}
	238	}
	239	if (tlen > VIO_MAX_TYPE_LEN) {
	240	printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
	241	type);
	242	return NULL;
2c4f4ecb	243	}
83292e0a	244
58fb6666	245	id = mdesc_get_property(hp, mp, "id", NULL);
91ba3c21	246
58fb6666 DM	247	cfg_handle = NULL;
	248	mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
	249	u64 target;
91ba3c21	250
58fb6666 DM	251	target = mdesc_arc_target(hp, a);
58fb6666 DM	252	cfg_handle = mdesc_get_property(hp, target,
91ba3c21	253	"cfg-handle", NULL);
58fb6666 DM	254	if (cfg_handle)
	255	break;
	256	}
91ba3c21	257
6160f635 DM	258	bus_id_name = type;
	259	if (!strcmp(type, "domain-services-port"))
	260	bus_id_name = "ds";
	261
08f42877 KS	262	/*
	263	* 20 char is the old driver-core name size limit, which is no more.
	264	* This check can probably be removed after review and possible
	265	* adaption of the vio users name length handling.
	266	*/
	267	if (strlen(bus_id_name) >= 20 - 4) {
6160f635 DM	268	printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
	269	bus_id_name);
	270	return NULL;
	271	}
	272
43fdf274	273	compat = mdesc_get_property(hp, mp, "device-type", &clen);
83292e0a DM	274	if (!compat) {
	275	clen = 0;
	276	} else if (clen > VIO_MAX_COMPAT_LEN) {
	277	printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
	278	clen, type);
	279	return NULL;
	280	}
e53e97ce DM	281
	282	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
	283	if (!vdev) {
	284	printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
	285	return NULL;
	286	}
	287
	288	vdev->mp = mp;
83292e0a DM	289	memcpy(vdev->type, type, tlen);
	290	if (compat)
	291	memcpy(vdev->compat, compat, clen);
	292	else
	293	memset(vdev->compat, 0, sizeof(vdev->compat));
e53e97ce DM	294	vdev->compat_len = clen;
e53e97ce DM	295
43fdf274 DM	296	vdev->channel_id = ~0UL;
	297	vdev->tx_irq = ~0;
	298	vdev->rx_irq = ~0;
e53e97ce	299
43fdf274	300	vio_fill_channel_info(hp, mp, vdev);
e53e97ce	301
91ba3c21	302	if (!id) {
2222c313	303	dev_set_name(&vdev->dev, "%s", bus_id_name);
91ba3c21	304	vdev->dev_no = ~(u64)0;
58fb6666	305	} else if (!cfg_handle) {
90181136	306	dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
91ba3c21	307	vdev->dev_no = *id;
58fb6666	308	} else {
90181136	309	dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
2222c313	310	cfg_handle, id);
58fb6666	311	vdev->dev_no = *cfg_handle;
91ba3c21	312	}
6160f635	313
e53e97ce DM	314	vdev->dev.parent = parent;
	315	vdev->dev.bus = &vio_bus_type;
	316	vdev->dev.release = vio_dev_release;
	317
	318	if (parent == NULL) {
	319	dp = cdev_node;
	320	} else if (to_vio_dev(parent) == root_vdev) {
	321	dp = of_get_next_child(cdev_node, NULL);
	322	while (dp) {
	323	if (!strcmp(dp->type, type))
	324	break;
	325
	326	dp = of_get_next_child(cdev_node, dp);
	327	}
	328	} else {
	329	dp = to_vio_dev(parent)->dp;
	330	}
	331	vdev->dp = dp;
	332
2222c313	333	printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
6160f635	334
e53e97ce DM	335	err = device_register(&vdev->dev);
	336	if (err) {
	337	printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
2222c313	338	dev_name(&vdev->dev), err);
e53e97ce DM	339	kfree(vdev);
	340	return NULL;
	341	}
	342	if (vdev->dp)
	343	err = sysfs_create_file(&vdev->dev.kobj,
	344	&dev_attr_obppath.attr);
	345
	346	return vdev;
	347	}
	348
6160f635	349	static void vio_add(struct mdesc_handle *hp, u64 node)
e53e97ce	350	{
6160f635	351	(void) vio_create_one(hp, node, &root_vdev->dev);
e53e97ce DM	352	}
e53e97ce DM	353
6160f635	354	static int vio_md_node_match(struct device dev, void arg)
e53e97ce	355	{
6160f635	356	struct vio_dev *vdev = to_vio_dev(dev);
2c4f4ecb	357
6160f635 DM	358	if (vdev->mp == (u64) arg)
6160f635 DM	359	return 1;
e53e97ce	360
6160f635 DM	361	return 0;
6160f635 DM	362	}
2c4f4ecb	363
6160f635 DM	364	static void vio_remove(struct mdesc_handle *hp, u64 node)
	365	{
	366	struct device *dev;
2c4f4ecb	367
6160f635 DM	368	dev = device_find_child(&root_vdev->dev, (void *) node,
	369	vio_md_node_match);
	370	if (dev) {
2222c313	371	printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
6160f635 DM	372
6160f635 DM	373	device_unregister(dev);
75e44803	374	put_device(dev);
2c4f4ecb	375	}
e53e97ce DM	376	}
e53e97ce DM	377
6160f635 DM	378	static struct mdesc_notifier_client vio_device_notifier = {
	379	.add = vio_add,
	380	.remove = vio_remove,
	381	.node_name = "virtual-device-port",
	382	};
	383
07607c54 DM	384	/* We are only interested in domain service ports under the
	385	* "domain-services" node. On control nodes there is another port
	386	* under "openboot" that we should not mess with as aparently that is
	387	* reserved exclusively for OBP use.
	388	*/
	389	static void vio_add_ds(struct mdesc_handle *hp, u64 node)
	390	{
	391	int found;
	392	u64 a;
	393
	394	found = 0;
	395	mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
	396	u64 target = mdesc_arc_target(hp, a);
	397	const char *name = mdesc_node_name(hp, target);
	398
	399	if (!strcmp(name, "domain-services")) {
	400	found = 1;
	401	break;
	402	}
	403	}
	404
	405	if (found)
	406	(void) vio_create_one(hp, node, &root_vdev->dev);
	407	}
	408
6160f635	409	static struct mdesc_notifier_client vio_ds_notifier = {
07607c54	410	.add = vio_add_ds,
6160f635 DM	411	.remove = vio_remove,
	412	.node_name = "domain-services-port",
	413	};
	414
7694b024 DM	415	static const char *channel_devices_node = "channel-devices";
	416	static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
	417	static const char *cfg_handle_prop = "cfg-handle";
e53e97ce DM	418
	419	static int __init vio_init(void)
	420	{
43fdf274	421	struct mdesc_handle *hp;
e53e97ce DM	422	const char *compat;
	423	const u64 *cfg_handle;
	424	int err, len;
43fdf274 DM	425	u64 root;
43fdf274 DM	426
f8be339c DM	427	err = bus_register(&vio_bus_type);
	428	if (err) {
	429	printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
	430	err);
	431	return err;
	432	}
	433
43fdf274 DM	434	hp = mdesc_grab();
	435	if (!hp)
	436	return 0;
e53e97ce	437
43fdf274 DM	438	root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
43fdf274 DM	439	if (root == MDESC_NODE_NULL) {
e53e97ce	440	printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
43fdf274	441	mdesc_release(hp);
e53e97ce DM	442	return 0;
	443	}
	444
	445	cdev_node = of_find_node_by_name(NULL, "channel-devices");
43fdf274	446	err = -ENODEV;
e53e97ce DM	447	if (!cdev_node) {
e53e97ce DM	448	printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
43fdf274	449	goto out_release;
e53e97ce DM	450	}
e53e97ce DM	451
43fdf274	452	compat = mdesc_get_property(hp, root, "compatible", &len);
e53e97ce DM	453	if (!compat) {
	454	printk(KERN_ERR "VIO: Channel devices lacks compatible "
	455	"property\n");
43fdf274	456	goto out_release;
e53e97ce	457	}
46bcea77	458	if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
e53e97ce DM	459	printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
e53e97ce DM	460	"compat entry.\n", channel_devices_compat);
43fdf274	461	goto out_release;
e53e97ce DM	462	}
e53e97ce DM	463
43fdf274	464	cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
e53e97ce DM	465	if (!cfg_handle) {
	466	printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
	467	cfg_handle_prop);
43fdf274	468	goto out_release;
e53e97ce DM	469	}
	470
	471	cdev_cfg_handle = *cfg_handle;
	472
6160f635 DM	473	root_vdev = vio_create_one(hp, root, NULL);
	474	err = -ENODEV;
	475	if (!root_vdev) {
02b7d834	476	printk(KERN_ERR "VIO: Could not create root device.\n");
6160f635 DM	477	goto out_release;
	478	}
	479
920c3ed7 DM	480	mdesc_register_notifier(&vio_device_notifier);
	481	mdesc_register_notifier(&vio_ds_notifier);
	482
43fdf274	483	mdesc_release(hp);
e53e97ce	484
6160f635	485	return err;
43fdf274 DM	486
	487	out_release:
	488	mdesc_release(hp);
	489	return err;
e53e97ce DM	490	}
	491
	492	postcore_initcall(vio_init);