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/irq.h>
14 #include <linux/init.h>
16 #include <asm/mdesc.h>
19 static const struct vio_device_id *vio_match_device(
20 const struct vio_device_id *matches,
21 const struct vio_dev *dev)
23 const char *type, *compat;
28 len = dev->compat_len;
30 while (matches->type[0] || matches->compat[0]) {
33 match &= !strcmp(matches->type, type);
35 if (matches->compat[0]) {
37 of_find_in_proplist(compat, matches->compat, len);
46 static int vio_bus_match(struct device *dev, struct device_driver *drv)
48 struct vio_dev *vio_dev = to_vio_dev(dev);
49 struct vio_driver *vio_drv = to_vio_driver(drv);
50 const struct vio_device_id *matches = vio_drv->id_table;
55 return vio_match_device(matches, vio_dev) != NULL;
58 static int vio_device_probe(struct device *dev)
60 struct vio_dev *vdev = to_vio_dev(dev);
61 struct vio_driver *drv = to_vio_driver(dev->driver);
62 const struct vio_device_id *id;
66 id = vio_match_device(drv->id_table, vdev);
68 error = drv->probe(vdev, id);
74 static int vio_device_remove(struct device *dev)
76 struct vio_dev *vdev = to_vio_dev(dev);
77 struct vio_driver *drv = to_vio_driver(dev->driver);
80 return drv->remove(vdev);
85 static ssize_t devspec_show(struct device *dev,
86 struct device_attribute *attr, char *buf)
88 struct vio_dev *vdev = to_vio_dev(dev);
89 const char *str = "none";
91 if (!strcmp(vdev->type, "vnet-port"))
93 else if (!strcmp(vdev->type, "vdc-port"))
96 return sprintf(buf, "%s\n", str);
99 static ssize_t type_show(struct device *dev,
100 struct device_attribute *attr, char *buf)
102 struct vio_dev *vdev = to_vio_dev(dev);
103 return sprintf(buf, "%s\n", vdev->type);
106 static struct device_attribute vio_dev_attrs[] = {
112 static struct bus_type vio_bus_type = {
114 .dev_attrs = vio_dev_attrs,
115 .match = vio_bus_match,
116 .probe = vio_device_probe,
117 .remove = vio_device_remove,
120 int vio_register_driver(struct vio_driver *viodrv)
122 viodrv->driver.bus = &vio_bus_type;
124 return driver_register(&viodrv->driver);
126 EXPORT_SYMBOL(vio_register_driver);
128 void vio_unregister_driver(struct vio_driver *viodrv)
130 driver_unregister(&viodrv->driver);
132 EXPORT_SYMBOL(vio_unregister_driver);
134 static void vio_dev_release(struct device *dev)
136 kfree(to_vio_dev(dev));
140 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
143 struct vio_dev *vdev;
144 struct device_node *dp;
146 vdev = to_vio_dev(dev);
149 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
152 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
153 show_pciobppath_attr, NULL);
155 struct device_node *cdev_node;
157 static struct vio_dev *root_vdev;
158 static u64 cdev_cfg_handle;
160 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
161 struct vio_dev *vdev)
165 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
170 target = mdesc_arc_target(hp, a);
172 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
174 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
176 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
178 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
180 chan_id = mdesc_get_property(hp, target, "id", NULL);
182 vdev->channel_id = *chan_id;
186 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
187 struct device *parent)
189 const char *type, *compat, *bus_id_name;
190 struct device_node *dp;
191 struct vio_dev *vdev;
193 const u64 *id, *cfg_handle;
196 type = mdesc_get_property(hp, mp, "device-type", &tlen);
198 type = mdesc_get_property(hp, mp, "name", &tlen);
200 type = mdesc_node_name(hp, mp);
201 tlen = strlen(type) + 1;
204 if (tlen > VIO_MAX_TYPE_LEN) {
205 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
210 id = mdesc_get_property(hp, mp, "id", NULL);
213 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
216 target = mdesc_arc_target(hp, a);
217 cfg_handle = mdesc_get_property(hp, target,
224 if (!strcmp(type, "domain-services-port"))
227 if (strlen(bus_id_name) >= KOBJ_NAME_LEN - 4) {
228 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
233 compat = mdesc_get_property(hp, mp, "device-type", &clen);
236 } else if (clen > VIO_MAX_COMPAT_LEN) {
237 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
242 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
244 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
249 memcpy(vdev->type, type, tlen);
251 memcpy(vdev->compat, compat, clen);
253 memset(vdev->compat, 0, sizeof(vdev->compat));
254 vdev->compat_len = clen;
256 vdev->channel_id = ~0UL;
260 vio_fill_channel_info(hp, mp, vdev);
263 snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s",
265 vdev->dev_no = ~(u64)0;
266 } else if (!cfg_handle) {
267 snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu",
271 snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%s-%lu-%lu",
272 bus_id_name, *cfg_handle, *id);
273 vdev->dev_no = *cfg_handle;
276 vdev->dev.parent = parent;
277 vdev->dev.bus = &vio_bus_type;
278 vdev->dev.release = vio_dev_release;
280 if (parent == NULL) {
282 } else if (to_vio_dev(parent) == root_vdev) {
283 dp = of_get_next_child(cdev_node, NULL);
285 if (!strcmp(dp->type, type))
288 dp = of_get_next_child(cdev_node, dp);
291 dp = to_vio_dev(parent)->dp;
295 printk(KERN_INFO "VIO: Adding device %s\n", vdev->dev.bus_id);
297 err = device_register(&vdev->dev);
299 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
300 vdev->dev.bus_id, err);
305 err = sysfs_create_file(&vdev->dev.kobj,
306 &dev_attr_obppath.attr);
311 static void vio_add(struct mdesc_handle *hp, u64 node)
313 (void) vio_create_one(hp, node, &root_vdev->dev);
316 static int vio_md_node_match(struct device *dev, void *arg)
318 struct vio_dev *vdev = to_vio_dev(dev);
320 if (vdev->mp == (u64) arg)
326 static void vio_remove(struct mdesc_handle *hp, u64 node)
330 dev = device_find_child(&root_vdev->dev, (void *) node,
333 printk(KERN_INFO "VIO: Removing device %s\n", dev->bus_id);
335 device_unregister(dev);
339 static struct mdesc_notifier_client vio_device_notifier = {
341 .remove = vio_remove,
342 .node_name = "virtual-device-port",
345 /* We are only interested in domain service ports under the
346 * "domain-services" node. On control nodes there is another port
347 * under "openboot" that we should not mess with as aparently that is
348 * reserved exclusively for OBP use.
350 static void vio_add_ds(struct mdesc_handle *hp, u64 node)
356 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
357 u64 target = mdesc_arc_target(hp, a);
358 const char *name = mdesc_node_name(hp, target);
360 if (!strcmp(name, "domain-services")) {
367 (void) vio_create_one(hp, node, &root_vdev->dev);
370 static struct mdesc_notifier_client vio_ds_notifier = {
372 .remove = vio_remove,
373 .node_name = "domain-services-port",
376 const char *channel_devices_node = "channel-devices";
377 const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
378 const char *cfg_handle_prop = "cfg-handle";
380 static int __init vio_init(void)
382 struct mdesc_handle *hp;
384 const u64 *cfg_handle;
388 err = bus_register(&vio_bus_type);
390 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
399 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
400 if (root == MDESC_NODE_NULL) {
401 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
406 cdev_node = of_find_node_by_name(NULL, "channel-devices");
409 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
413 compat = mdesc_get_property(hp, root, "compatible", &len);
415 printk(KERN_ERR "VIO: Channel devices lacks compatible "
419 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
420 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
421 "compat entry.\n", channel_devices_compat);
425 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
427 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
432 cdev_cfg_handle = *cfg_handle;
434 root_vdev = vio_create_one(hp, root, NULL);
437 printk(KERN_ERR "VIO: Coult not create root device.\n");
441 mdesc_register_notifier(&vio_device_notifier);
442 mdesc_register_notifier(&vio_ds_notifier);
453 postcore_initcall(vio_init);