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 inline int find_in_proplist(const char *list, const char *match,
25 if (!strcmp(list, match))
34 static const struct vio_device_id *vio_match_device(
35 const struct vio_device_id *matches,
36 const struct vio_dev *dev)
38 const char *type, *compat;
43 len = dev->compat_len;
45 while (matches->type[0] || matches->compat[0]) {
47 if (matches->type[0]) {
49 && !strcmp(matches->type, type);
51 if (matches->compat[0]) {
53 find_in_proplist(compat, matches->compat, len);
62 static int vio_bus_match(struct device *dev, struct device_driver *drv)
64 struct vio_dev *vio_dev = to_vio_dev(dev);
65 struct vio_driver *vio_drv = to_vio_driver(drv);
66 const struct vio_device_id *matches = vio_drv->id_table;
71 return vio_match_device(matches, vio_dev) != NULL;
74 static int vio_device_probe(struct device *dev)
76 struct vio_dev *vdev = to_vio_dev(dev);
77 struct vio_driver *drv = to_vio_driver(dev->driver);
78 const struct vio_device_id *id;
82 id = vio_match_device(drv->id_table, vdev);
84 error = drv->probe(vdev, id);
90 static int vio_device_remove(struct device *dev)
92 struct vio_dev *vdev = to_vio_dev(dev);
93 struct vio_driver *drv = to_vio_driver(dev->driver);
96 return drv->remove(vdev);
101 static ssize_t devspec_show(struct device *dev,
102 struct device_attribute *attr, char *buf)
104 struct vio_dev *vdev = to_vio_dev(dev);
105 const char *str = "none";
107 if (!strcmp(vdev->type, "network"))
109 else if (!strcmp(vdev->type, "block"))
112 return sprintf(buf, "%s\n", str);
115 static ssize_t type_show(struct device *dev,
116 struct device_attribute *attr, char *buf)
118 struct vio_dev *vdev = to_vio_dev(dev);
119 return sprintf(buf, "%s\n", vdev->type);
122 static struct device_attribute vio_dev_attrs[] = {
128 static struct bus_type vio_bus_type = {
130 .dev_attrs = vio_dev_attrs,
131 .match = vio_bus_match,
132 .probe = vio_device_probe,
133 .remove = vio_device_remove,
136 int vio_register_driver(struct vio_driver *viodrv)
138 viodrv->driver.bus = &vio_bus_type;
140 return driver_register(&viodrv->driver);
142 EXPORT_SYMBOL(vio_register_driver);
144 void vio_unregister_driver(struct vio_driver *viodrv)
146 driver_unregister(&viodrv->driver);
148 EXPORT_SYMBOL(vio_unregister_driver);
150 static void __devinit vio_dev_release(struct device *dev)
152 kfree(to_vio_dev(dev));
156 show_pciobppath_attr(struct device *dev, struct device_attribute *attr,
159 struct vio_dev *vdev;
160 struct device_node *dp;
162 vdev = to_vio_dev(dev);
165 return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name);
168 static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH,
169 show_pciobppath_attr, NULL);
171 struct device_node *cdev_node;
173 static struct vio_dev *root_vdev;
174 static u64 cdev_cfg_handle;
176 static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
177 struct vio_dev *vdev)
181 mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) {
186 target = mdesc_arc_target(hp, a);
188 irq = mdesc_get_property(hp, target, "tx-ino", NULL);
190 vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
192 irq = mdesc_get_property(hp, target, "rx-ino", NULL);
194 vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
196 chan_id = mdesc_get_property(hp, target, "id", NULL);
198 vdev->channel_id = *chan_id;
202 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
203 struct device *parent)
205 const char *type, *compat;
206 struct device_node *dp;
207 struct vio_dev *vdev;
210 type = mdesc_get_property(hp, mp, "device-type", NULL);
212 type = mdesc_get_property(hp, mp, "name", NULL);
214 type = mdesc_node_name(hp, mp);
216 compat = mdesc_get_property(hp, mp, "device-type", &clen);
218 vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
220 printk(KERN_ERR "VIO: Could not allocate vio_dev\n");
226 vdev->compat = compat;
227 vdev->compat_len = clen;
229 vdev->channel_id = ~0UL;
233 vio_fill_channel_info(hp, mp, vdev);
235 snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%lx", mp);
236 vdev->dev.parent = parent;
237 vdev->dev.bus = &vio_bus_type;
238 vdev->dev.release = vio_dev_release;
240 if (parent == NULL) {
242 } else if (to_vio_dev(parent) == root_vdev) {
243 dp = of_get_next_child(cdev_node, NULL);
245 if (!strcmp(dp->type, type))
248 dp = of_get_next_child(cdev_node, dp);
251 dp = to_vio_dev(parent)->dp;
255 err = device_register(&vdev->dev);
257 printk(KERN_ERR "VIO: Could not register device %s, err=%d\n",
258 vdev->dev.bus_id, err);
263 err = sysfs_create_file(&vdev->dev.kobj,
264 &dev_attr_obppath.attr);
269 static void walk_tree(struct mdesc_handle *hp, u64 n, struct vio_dev *parent)
273 mdesc_for_each_arc(a, hp, n, MDESC_ARC_TYPE_FWD) {
274 struct vio_dev *vdev;
277 target = mdesc_arc_target(hp, a);
278 vdev = vio_create_one(hp, target, &parent->dev);
280 walk_tree(hp, target, vdev);
284 static void create_devices(struct mdesc_handle *hp, u64 root)
288 root_vdev = vio_create_one(hp, root, NULL);
290 printk(KERN_ERR "VIO: Coult not create root device.\n");
294 walk_tree(hp, root, root_vdev);
296 /* Domain services is odd as it doesn't sit underneath the
297 * channel-devices node, so we plug it in manually.
299 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "domain-services");
300 if (mp != MDESC_NODE_NULL) {
301 struct vio_dev *parent = vio_create_one(hp, mp,
305 walk_tree(hp, mp, parent);
309 const char *channel_devices_node = "channel-devices";
310 const char *channel_devices_compat = "SUNW,sun4v-channel-devices";
311 const char *cfg_handle_prop = "cfg-handle";
313 static int __init vio_init(void)
315 struct mdesc_handle *hp;
317 const u64 *cfg_handle;
325 root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node);
326 if (root == MDESC_NODE_NULL) {
327 printk(KERN_INFO "VIO: No channel-devices MDESC node.\n");
332 cdev_node = of_find_node_by_name(NULL, "channel-devices");
335 printk(KERN_INFO "VIO: No channel-devices OBP node.\n");
339 compat = mdesc_get_property(hp, root, "compatible", &len);
341 printk(KERN_ERR "VIO: Channel devices lacks compatible "
345 if (!find_in_proplist(compat, channel_devices_compat, len)) {
346 printk(KERN_ERR "VIO: Channel devices node lacks (%s) "
347 "compat entry.\n", channel_devices_compat);
351 cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL);
353 printk(KERN_ERR "VIO: Channel devices lacks %s property\n",
358 cdev_cfg_handle = *cfg_handle;
360 err = bus_register(&vio_bus_type);
362 printk(KERN_ERR "VIO: Could not register bus type err=%d\n",
367 create_devices(hp, root);
378 postcore_initcall(vio_init);