Fixed MTP to work with TWRP

arch/sparc/kernel/vio.c

@@ -0,0 +1,474 @@
+/* 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_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, 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);