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_bus_match(struct device *dev, struct device_driver *drv)
50 struct vio_dev *vio_dev = to_vio_dev(dev);
51 struct vio_driver *vio_drv = to_vio_driver(drv);
52 const struct vio_device_id *matches = vio_drv->id_table;
57 return vio_match_device(matches, vio_dev) != NULL;
60 static int vio_device_probe(struct device *dev)
62 struct vio_dev *vdev = to_vio_dev(dev);
63 struct vio_driver *drv = to_vio_driver(dev->driver);
64 const struct vio_device_id *id;
68 id = vio_match_device(drv->id_table, vdev);
70 error = drv->probe(vdev, id);
76 static int vio_device_remove(struct device *dev)
78 struct vio_dev *vdev = to_vio_dev(dev);
79 struct vio_driver *drv = to_vio_driver(dev->driver);
82 return drv->remove(vdev);
87 static ssize_t devspec_show(struct device *dev,
88 struct device_attribute *attr, char *buf)
90 struct vio_dev *vdev = to_vio_dev(dev);
91 const char *str = "none";
93 if (!strcmp(vdev->type, "vnet-port"))
95 else if (!strcmp(vdev->type, "vdc-port"))
98 return sprintf(buf, "%s\n", str);
101 static ssize_t type_show(struct device *dev,
102 struct device_attribute *attr, char *buf)
104 struct vio_dev *vdev = to_vio_dev(dev);
105 return sprintf(buf, "%s\n", vdev->type);
108 static struct device_attribute vio_dev_attrs[] = {
114 static struct bus_type vio_bus_type = {
116 .dev_attrs = vio_dev_attrs,
117 .match = vio_bus_match,
118 .probe = vio_device_probe,
119 .remove = vio_device_remove,
122 int vio_register_driver(struct vio_driver *viodrv)
124 viodrv->driver.bus = &vio_bus_type;
126 return driver_register(&viodrv->driver);
128 EXPORT_SYMBOL(vio_register_driver);
130 void vio_unregister_driver(struct vio_driver *viodrv)
132 driver_unregister(&viodrv->driver);
134 EXPORT_SYMBOL(vio_unregister_driver);
136 static void vio_dev_release(struct device *dev)
138 kfree(to_vio_dev(dev));
142 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
145 struct vio_dev *vdev;
146 struct device_node *dp;
148 vdev = to_vio_dev(dev);
151 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
154 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
155 show_pciobppath_attr, NULL);
157 static struct device_node *cdev_node;
159 static struct vio_dev *root_vdev;
160 static u64 cdev_cfg_handle;
162 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
163 struct vio_dev *vdev)
167 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
172 target = mdesc_arc_target(hp, a);
174 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
176 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
178 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
180 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
182 chan_id = mdesc_get_property(hp, target, "id", NULL);
184 vdev->channel_id = *chan_id;
188 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
189 struct device *parent)
191 const char *type, *compat, *bus_id_name;
192 struct device_node *dp;
193 struct vio_dev *vdev;
195 const u64 *id, *cfg_handle;
198 type = mdesc_get_property(hp, mp, "device-type", &tlen);
200 type = mdesc_get_property(hp, mp, "name", &tlen);
202 type = mdesc_node_name(hp, mp);
203 tlen = strlen(type) + 1;
206 if (tlen > VIO_MAX_TYPE_LEN) {
207 printk(KERN_ERR "VIO: Type string [%s] is too long.\n",
212 id = mdesc_get_property(hp, mp, "id", NULL);
215 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_BACK) {
218 target = mdesc_arc_target(hp, a);
219 cfg_handle = mdesc_get_property(hp, target,
226 if (!strcmp(type, "domain-services-port"))
230 * 20 char is the old driver-core name size limit, which is no more.
231 * This check can probably be removed after review and possible
232 * adaption of the vio users name length handling.
234 if (strlen(bus_id_name) >= 20 - 4) {
235 printk(KERN_ERR "VIO: bus_id_name [%s] is too long.\n",
240 compat = mdesc_get_property(hp, mp, "device-type", &clen);
243 } else if (clen > VIO_MAX_COMPAT_LEN) {
244 printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n",
249 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
251 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
256 memcpy(vdev->type, type, tlen);
258 memcpy(vdev->compat, compat, clen);
260 memset(vdev->compat, 0, sizeof(vdev->compat));
261 vdev->compat_len = clen;
263 vdev->channel_id = ~0UL;
267 vio_fill_channel_info(hp, mp, vdev);
270 dev_set_name(&vdev->dev, "%s", bus_id_name);
271 vdev->dev_no = ~(u64)0;
272 } else if (!cfg_handle) {
273 dev_set_name(&vdev->dev, "%s-%llu", bus_id_name, *id);
276 dev_set_name(&vdev->dev, "%s-%llu-%llu", bus_id_name,
278 vdev->dev_no = *cfg_handle;
281 vdev->dev.parent = parent;
282 vdev->dev.bus = &vio_bus_type;
283 vdev->dev.release = vio_dev_release;
285 if (parent == NULL) {
287 } else if (to_vio_dev(parent) == root_vdev) {
288 dp = of_get_next_child(cdev_node, NULL);
290 if (!strcmp(dp->type, type))
293 dp = of_get_next_child(cdev_node, dp);
296 dp = to_vio_dev(parent)->dp;
300 printk(KERN_INFO "VIO: Adding device %s\n", dev_name(&vdev->dev));
302 err = device_register(&vdev->dev);
304 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
305 dev_name(&vdev->dev), err);
310 err = sysfs_create_file(&vdev->dev.kobj,
311 &dev_attr_obppath.attr);
316 static void vio_add(struct mdesc_handle *hp, u64 node)
318 (void) vio_create_one(hp, node, &root_vdev->dev);
321 static int vio_md_node_match(struct device *dev, void *arg)
323 struct vio_dev *vdev = to_vio_dev(dev);
325 if (vdev->mp == (u64) arg)
331 static void vio_remove(struct mdesc_handle *hp, u64 node)
335 dev = device_find_child(&root_vdev->dev, (void *) node,
338 printk(KERN_INFO "VIO: Removing device %s\n", dev_name(dev));
340 device_unregister(dev);
344 static struct mdesc_notifier_client vio_device_notifier = {
346 .remove = vio_remove,
347 .node_name = "virtual-device-port",
350 /* We are only interested in domain service ports under the
351 * "domain-services" node. On control nodes there is another port
352 * under "openboot" that we should not mess with as aparently that is
353 * reserved exclusively for OBP use.
355 static void vio_add_ds(struct mdesc_handle *hp, u64 node)
361 mdesc_for_each_arc(a, hp, node, MDESC_ARC_TYPE_BACK) {
362 u64 target = mdesc_arc_target(hp, a);
363 const char *name = mdesc_node_name(hp, target);
365 if (!strcmp(name, "domain-services")) {
372 (void) vio_create_one(hp, node, &root_vdev->dev);
375 static struct mdesc_notifier_client vio_ds_notifier = {
377 .remove = vio_remove,
378 .node_name = "domain-services-port",
381 static const char *channel_devices_node = "channel-devices";
382 static const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
383 static const char *cfg_handle_prop = "cfg-handle";
385 static int __init vio_init(void)
387 struct mdesc_handle *hp;
389 const u64 *cfg_handle;
393 err = bus_register(&vio_bus_type);
395 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
404 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
405 if (root == MDESC_NODE_NULL) {
406 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
411 cdev_node = of_find_node_by_name(NULL, "channel-devices");
414 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
418 compat = mdesc_get_property(hp, root, "compatible", &len);
420 printk(KERN_ERR "VIO: Channel devices lacks compatible "
424 if (!of_find_in_proplist(compat, channel_devices_compat, len)) {
425 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
426 "compat entry.\n", channel_devices_compat);
430 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
432 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
437 cdev_cfg_handle = *cfg_handle;
439 root_vdev = vio_create_one(hp, root, NULL);
442 printk(KERN_ERR "VIO: Coult not create root device.\n");
446 mdesc_register_notifier(&vio_device_notifier);
447 mdesc_register_notifier(&vio_ds_notifier);
458 postcore_initcall(vio_init);