1 /* vio.c: Virtual I/O channel devices probing infrastructure.
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>
9 * Adapted to sparc64 by David S. Miller davem@davemloft.net
12 #include <linux/kernel.h>
13 #include <linux/slab.h>
14 #include <linux/irq.h>
15 #include <linux/export.h>
16 #include <linux/init.h>
18 #include <asm/mdesc.h>
21 static const struct vio_device_id *vio_match_device(
22 const struct vio_device_id *matches,
23 const struct vio_dev *dev)
25 const char *type, *compat;
30 len = dev->compat_len;
32 while (matches->type[0] || matches->compat[0]) {
35 match &= !strcmp(matches->type, type);
37 if (matches->compat[0]) {
39 of_find_in_proplist(compat, matches->compat, len);
48 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
50 const struct vio_dev *vio_dev = to_vio_dev(dev);
52 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, vio_dev->compat);
56 static int vio_bus_match(struct device *dev, struct device_driver *drv)
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;
65 return vio_match_device(matches, vio_dev) != NULL;
68 static int vio_device_probe(struct device *dev)
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;
76 id = vio_match_device(drv->id_table, vdev);
78 error = drv->probe(vdev, id);
84 static int vio_device_remove(struct device *dev)
86 struct vio_dev *vdev = to_vio_dev(dev);
87 struct vio_driver *drv = to_vio_driver(dev->driver);
90 return drv->remove(vdev);
95 static ssize_t devspec_show(struct device *dev,
96 struct device_attribute *attr, char *buf)
98 struct vio_dev *vdev = to_vio_dev(dev);
99 const char *str = "none";
101 if (!strcmp(vdev->type, "vnet-port"))
103 else if (!strcmp(vdev->type, "vdc-port"))
106 return sprintf(buf, "%s\n", str);
108 static DEVICE_ATTR_RO(devspec);
110 static ssize_t type_show(struct device *dev,
111 struct device_attribute *attr, char *buf)
113 struct vio_dev *vdev = to_vio_dev(dev);
114 return sprintf(buf, "%s\n", vdev->type);
116 static DEVICE_ATTR_RO(type);
118 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
121 const struct vio_dev *vdev = to_vio_dev(dev);
123 return sprintf(buf, "vio:T%sS%s\n", vdev->type, vdev->compat);
125 static DEVICE_ATTR_RO(modalias);
127 static struct attribute *vio_dev_attrs[] = {
128 &dev_attr_devspec.attr,
130 &dev_attr_modalias.attr,
133 ATTRIBUTE_GROUPS(vio_dev);
135 static struct bus_type vio_bus_type = {
137 .dev_groups = vio_dev_groups,
138 .uevent = vio_hotplug,
139 .match = vio_bus_match,
140 .probe = vio_device_probe,
141 .remove = vio_device_remove,
144 int __vio_register_driver(struct vio_driver *viodrv, struct module *owner,
145 const char *mod_name)
147 viodrv->driver.bus = &vio_bus_type;
148 viodrv->driver.name = viodrv->name;
149 viodrv->driver.owner = owner;
150 viodrv->driver.mod_name = mod_name;
152 return driver_register(&viodrv->driver);
154 EXPORT_SYMBOL(__vio_register_driver);
156 void vio_unregister_driver(struct vio_driver *viodrv)
158 driver_unregister(&viodrv->driver);
160 EXPORT_SYMBOL(vio_unregister_driver);
162 static void vio_dev_release(struct device *dev)
164 kfree(to_vio_dev(dev));
168 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
171 struct vio_dev *vdev;
172 struct device_node *dp;
174 vdev = to_vio_dev(dev);
177 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
180 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
181 show_pciobppath_attr, NULL);
183 static struct device_node *cdev_node;
185 static struct vio_dev *root_vdev;
186 static u64 cdev_cfg_handle;
188 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
189 struct vio_dev *vdev)
193 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
198 target = mdesc_arc_target(hp, a);
200 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
202 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
204 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
206 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
210 chan_id = mdesc_get_property(hp, target, "id", NULL);
212 vdev->channel_id = *chan_id;
216 int vio_set_intr(unsigned long dev_ino, int state)
220 err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
223 EXPORT_SYMBOL(vio_set_intr);
225 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
226 struct device *parent)
228 const char *type, *compat, *bus_id_name;
229 struct device_node *dp;
230 struct vio_dev *vdev;
232 const u64 *id, *cfg_handle;
235 type = mdesc_get_property(hp, mp, "device-type", &tlen);
237 type = mdesc_get_property(hp, mp, "name", &tlen);
239 type = mdesc_node_name(hp, mp);
240 tlen = strlen(type) + 1;
243 if (tlen > VIO_MAX_TYPE_LEN) {
244 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
249 id = mdesc_get_property(hp, mp, "id", NULL);
252 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
255 target = mdesc_arc_target(hp, a);
256 cfg_handle = mdesc_get_property(hp, target,
263 if (!strcmp(type, "domain-services-port"))
267 * 20 char is the old driver-core name size limit, which is no more.
268 * This check can probably be removed after review and possible
269 * adaption of the vio users name length handling.
271 if (strlen(bus_id_name) >= 20 - 4) {
272 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
277 compat = mdesc_get_property(hp, mp, "device-type", &clen);
280 } else if (clen > VIO_MAX_COMPAT_LEN) {
281 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
286 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
288 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
293 memcpy(vdev->type, type, tlen);
295 memcpy(vdev->compat, compat, clen);
297 memset(vdev->compat, 0, sizeof(vdev->compat));
298 vdev->compat_len = clen;
300 vdev->channel_id = ~0UL;
304 vio_fill_channel_info(hp, mp, vdev);
307 dev_set_name(&vdev->dev, "%s", bus_id_name);
308 vdev->dev_no = ~(u64)0;
309 } else if (!cfg_handle) {
310 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
313 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
315 vdev->dev_no = *cfg_handle;
318 vdev->dev.parent = parent;
319 vdev->dev.bus = &vio_bus_type;
320 vdev->dev.release = vio_dev_release;
322 if (parent == NULL) {
324 } else if (to_vio_dev(parent) == root_vdev) {
325 dp = of_get_next_child(cdev_node, NULL);
327 if (!strcmp(dp->type, type))
330 dp = of_get_next_child(cdev_node, dp);
333 dp = to_vio_dev(parent)->dp;
337 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
339 err = device_register(&vdev->dev);
341 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
342 dev_name(&vdev->dev), err);
347 err = sysfs_create_file(&vdev->dev.kobj,
348 &dev_attr_obppath.attr);
353 static void vio_add(struct mdesc_handle *hp, u64 node)
355 (void) vio_create_one(hp, node, &root_vdev->dev);
358 static int vio_md_node_match(struct device *dev, void *arg)
360 struct vio_dev *vdev = to_vio_dev(dev);
362 if (vdev->mp == (u64) arg)
368 static void vio_remove(struct mdesc_handle *hp, u64 node)
372 dev = device_find_child(&root_vdev->dev, (void *) node,
375 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
377 device_unregister(dev);
382 static struct mdesc_notifier_client vio_device_notifier = {
384 .remove = vio_remove,
385 .node_name = "virtual-device-port",
388 /* We are only interested in domain service ports under the
389 * "domain-services" node. On control nodes there is another port
390 * under "openboot" that we should not mess with as aparently that is
391 * reserved exclusively for OBP use.
393 static void vio_add_ds(struct mdesc_handle *hp, u64 node)
399 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
400 u64 target = mdesc_arc_target(hp, a);
401 const char *name = mdesc_node_name(hp, target);
403 if (!strcmp(name, "domain-services")) {
410 (void) vio_create_one(hp, node, &root_vdev->dev);
413 static struct mdesc_notifier_client vio_ds_notifier = {
415 .remove = vio_remove,
416 .node_name = "domain-services-port",
419 static const char *channel_devices_node = "channel-devices";
420 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
421 static const char *cfg_handle_prop = "cfg-handle";
423 static int __init vio_init(void)
425 struct mdesc_handle *hp;
427 const u64 *cfg_handle;
431 err = bus_register(&vio_bus_type);
433 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
442 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
443 if (root == MDESC_NODE_NULL) {
444 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
449 cdev_node = of_find_node_by_name(NULL, "channel-devices");
452 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
456 compat = mdesc_get_property(hp, root, "compatible", &len);
458 printk(KERN_ERR "VIO: Channel devices lacks compatible "
462 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
463 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
464 "compat entry.\n", channel_devices_compat);
468 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
470 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
475 cdev_cfg_handle = *cfg_handle;
477 root_vdev = vio_create_one(hp, root, NULL);
480 printk(KERN_ERR "VIO: Could not create root device.\n");
484 mdesc_register_notifier(&vio_device_notifier);
485 mdesc_register_notifier(&vio_ds_notifier);
496 postcore_initcall(vio_init);