1 files changed, 347 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/vio.c b/arch/sparc64/kernel/vio.c
new file mode 100644
index 000000000000..21c015e8365b
--- /dev/null
+++ b/arch/sparc64/kernel/vio.c
@@ -0,0 +1,347 @@
+/* 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 &= type
+				&& !strcmp(matches->type, type);
+		}
+		if (matches->compat[0]) {
+			match &= compat &&
+				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 (vdev->type) {
+		if (!strcmp(vdev->type, "network"))
+			str = "vnet";
+		else if (!strcmp(vdev->type, "block"))
+			str = "vdisk";
+	}
+
+	return sprintf(buf, "%s\n", str);
+}
+
+static struct device_attribute vio_dev_attrs[] = {
+	__ATTR_RO(devspec),
+	__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);
+
+struct mdesc_node *vio_find_endpoint(struct vio_dev *vdev)
+{
+	struct mdesc_node *endp, *mp = vdev->mp;
+	int i;
+
+	endp = NULL;
+	for (i = 0; i < mp->num_arcs; i++) {
+		struct mdesc_node *t;
+
+		if (strcmp(mp->arcs[i].name, "fwd"))
+			continue;
+
+		t = mp->arcs[i].arc;
+		if (strcmp(t->name, "channel-endpoint"))
+			continue;
+
+		endp = t;
+		break;
+	}
+
+	return endp;
+}
+EXPORT_SYMBOL(vio_find_endpoint);
+
+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 struct vio_dev *vio_create_one(struct mdesc_node *mp,
+				      struct device *parent)
+{
+	const char *type, *compat;
+	struct device_node *dp;
+	struct vio_dev *vdev;
+	const u64 *irq;
+	int err, clen;
+
+	type = md_get_property(mp, "device-type", NULL);
+	if (!type)
+		type = md_get_property(mp, "name", NULL);
+	compat = md_get_property(mp, "device-type", &clen);
+
+	vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+	if (!vdev) {
+		printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
+		return NULL;
+	}
+
+	vdev->mp = mp;
+	vdev->type = type;
+	vdev->compat = compat;
+	vdev->compat_len = clen;
+
+	irq = md_get_property(mp, "tx-ino", NULL);
+	if (irq)
+		mp->irqs[0] = sun4v_build_virq(cdev_cfg_handle, *irq);
+
+	irq = md_get_property(mp, "rx-ino", NULL);
+	if (irq)
+		mp->irqs[1] = sun4v_build_virq(cdev_cfg_handle, *irq);
+
+	snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%lx", mp->node);
+	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;
+
+	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 walk_tree(struct mdesc_node *n, struct vio_dev *parent)
+{
+	int i;
+
+	for (i = 0; i < n->num_arcs; i++) {
+		struct mdesc_node *mp;
+		struct vio_dev *vdev;
+
+		if (strcmp(n->arcs[i].name, "fwd"))
+			continue;
+
+		mp = n->arcs[i].arc;
+
+		vdev = vio_create_one(mp, &parent->dev);
+		if (vdev && mp->num_arcs)
+			walk_tree(mp, vdev);
+	}
+}
+
+static void create_devices(struct mdesc_node *root)
+{
+	root_vdev = vio_create_one(root, NULL);
+	if (!root_vdev) {
+		printk(KERN_ERR "VIO: Coult not create root device.\n");
+		return;
+	}
+
+	walk_tree(root, root_vdev);
+}
+
+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_node *root;
+	const char *compat;
+	const u64 *cfg_handle;
+	int err, len;
+
+	root = md_find_node_by_name(NULL, channel_devices_node);
+	if (!root) {
+		printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
+		return 0;
+	}
+
+	cdev_node = of_find_node_by_name(NULL, "channel-devices");
+	if (!cdev_node) {
+		printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
+		return -ENODEV;
+	}
+
+	compat = md_get_property(root, "compatible", &len);
+	if (!compat) {
+		printk(KERN_ERR "VIO: Channel devices lacks compatible "
+		       "property\n");
+		return -ENODEV;
+	}
+	if (!find_in_proplist(compat, channel_devices_compat, len)) {
+		printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
+		       "compat entry.\n", channel_devices_compat);
+		return -ENODEV;
+	}
+
+	cfg_handle = md_get_property(root, cfg_handle_prop, NULL);
+	if (!cfg_handle) {
+		printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
+		       cfg_handle_prop);
+		return -ENODEV;
+	}
+
+	cdev_cfg_handle = *cfg_handle;
+
+	err = bus_register(&vio_bus_type);
+	if (err) {
+		printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
+		       err);
+		return err;
+	}
+
+	create_devices(root);
+
+	return 0;
+}
+
+postcore_initcall(vio_init);