Commit | Line | Data |
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e53e97ce DM |
1 | /* vio.c: Virtual I/O channel devices probing infrastructure. |
2 | * | |
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> | |
7 | * Stephen Rothwell | |
8 | * | |
9 | * Adapted to sparc64 by David S. Miller davem@davemloft.net | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/init.h> | |
15 | ||
16 | #include <asm/mdesc.h> | |
17 | #include <asm/vio.h> | |
18 | ||
19 | static inline int find_in_proplist(const char *list, const char *match, | |
20 | int len) | |
21 | { | |
22 | while (len > 0) { | |
23 | int l; | |
24 | ||
25 | if (!strcmp(list, match)) | |
26 | return 1; | |
27 | l = strlen(list) + 1; | |
28 | list += l; | |
29 | len -= l; | |
30 | } | |
31 | return 0; | |
32 | } | |
33 | ||
34 | static const struct vio_device_id *vio_match_device( | |
35 | const struct vio_device_id *matches, | |
36 | const struct vio_dev *dev) | |
37 | { | |
38 | const char *type, *compat; | |
39 | int len; | |
40 | ||
41 | type = dev->type; | |
42 | compat = dev->compat; | |
43 | len = dev->compat_len; | |
44 | ||
45 | while (matches->type[0] || matches->compat[0]) { | |
46 | int match = 1; | |
83292e0a DM |
47 | if (matches->type[0]) |
48 | match &= !strcmp(matches->type, type); | |
49 | ||
e53e97ce | 50 | if (matches->compat[0]) { |
83292e0a | 51 | match &= len && |
e53e97ce DM |
52 | find_in_proplist(compat, matches->compat, len); |
53 | } | |
54 | if (match) | |
55 | return matches; | |
56 | matches++; | |
57 | } | |
58 | return NULL; | |
59 | } | |
60 | ||
61 | static int vio_bus_match(struct device *dev, struct device_driver *drv) | |
62 | { | |
63 | struct vio_dev *vio_dev = to_vio_dev(dev); | |
64 | struct vio_driver *vio_drv = to_vio_driver(drv); | |
65 | const struct vio_device_id *matches = vio_drv->id_table; | |
66 | ||
67 | if (!matches) | |
68 | return 0; | |
69 | ||
70 | return vio_match_device(matches, vio_dev) != NULL; | |
71 | } | |
72 | ||
73 | static int vio_device_probe(struct device *dev) | |
74 | { | |
75 | struct vio_dev *vdev = to_vio_dev(dev); | |
76 | struct vio_driver *drv = to_vio_driver(dev->driver); | |
77 | const struct vio_device_id *id; | |
78 | int error = -ENODEV; | |
79 | ||
80 | if (drv->probe) { | |
81 | id = vio_match_device(drv->id_table, vdev); | |
82 | if (id) | |
83 | error = drv->probe(vdev, id); | |
84 | } | |
85 | ||
86 | return error; | |
87 | } | |
88 | ||
89 | static int vio_device_remove(struct device *dev) | |
90 | { | |
91 | struct vio_dev *vdev = to_vio_dev(dev); | |
92 | struct vio_driver *drv = to_vio_driver(dev->driver); | |
93 | ||
94 | if (drv->remove) | |
95 | return drv->remove(vdev); | |
96 | ||
97 | return 1; | |
98 | } | |
99 | ||
100 | static ssize_t devspec_show(struct device *dev, | |
101 | struct device_attribute *attr, char *buf) | |
102 | { | |
103 | struct vio_dev *vdev = to_vio_dev(dev); | |
104 | const char *str = "none"; | |
105 | ||
2c4f4ecb DM |
106 | if (!strcmp(vdev->type, "network")) |
107 | str = "vnet"; | |
108 | else if (!strcmp(vdev->type, "block")) | |
109 | str = "vdisk"; | |
e53e97ce DM |
110 | |
111 | return sprintf(buf, "%s\n", str); | |
112 | } | |
113 | ||
2c4f4ecb DM |
114 | static ssize_t type_show(struct device *dev, |
115 | struct device_attribute *attr, char *buf) | |
116 | { | |
117 | struct vio_dev *vdev = to_vio_dev(dev); | |
118 | return sprintf(buf, "%s\n", vdev->type); | |
119 | } | |
120 | ||
e53e97ce DM |
121 | static struct device_attribute vio_dev_attrs[] = { |
122 | __ATTR_RO(devspec), | |
2c4f4ecb | 123 | __ATTR_RO(type), |
e53e97ce DM |
124 | __ATTR_NULL |
125 | }; | |
126 | ||
127 | static struct bus_type vio_bus_type = { | |
128 | .name = "vio", | |
129 | .dev_attrs = vio_dev_attrs, | |
130 | .match = vio_bus_match, | |
131 | .probe = vio_device_probe, | |
132 | .remove = vio_device_remove, | |
133 | }; | |
134 | ||
135 | int vio_register_driver(struct vio_driver *viodrv) | |
136 | { | |
137 | viodrv->driver.bus = &vio_bus_type; | |
138 | ||
139 | return driver_register(&viodrv->driver); | |
140 | } | |
141 | EXPORT_SYMBOL(vio_register_driver); | |
142 | ||
143 | void vio_unregister_driver(struct vio_driver *viodrv) | |
144 | { | |
145 | driver_unregister(&viodrv->driver); | |
146 | } | |
147 | EXPORT_SYMBOL(vio_unregister_driver); | |
148 | ||
e53e97ce DM |
149 | static void __devinit vio_dev_release(struct device *dev) |
150 | { | |
151 | kfree(to_vio_dev(dev)); | |
152 | } | |
153 | ||
154 | static ssize_t | |
155 | show_pciobppath_attr(struct device *dev, struct device_attribute *attr, | |
156 | char *buf) | |
157 | { | |
158 | struct vio_dev *vdev; | |
159 | struct device_node *dp; | |
160 | ||
161 | vdev = to_vio_dev(dev); | |
162 | dp = vdev->dp; | |
163 | ||
164 | return snprintf (buf, PAGE_SIZE, "%s\n", dp->full_name); | |
165 | } | |
166 | ||
167 | static DEVICE_ATTR(obppath, S_IRUSR | S_IRGRP | S_IROTH, | |
168 | show_pciobppath_attr, NULL); | |
169 | ||
170 | struct device_node *cdev_node; | |
171 | ||
172 | static struct vio_dev *root_vdev; | |
173 | static u64 cdev_cfg_handle; | |
174 | ||
43fdf274 DM |
175 | static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp, |
176 | struct vio_dev *vdev) | |
177 | { | |
178 | u64 a; | |
179 | ||
180 | mdesc_for_each_arc(a, hp, mp, MDESC_ARC_TYPE_FWD) { | |
181 | const u64 *chan_id; | |
182 | const u64 *irq; | |
183 | u64 target; | |
184 | ||
185 | target = mdesc_arc_target(hp, a); | |
186 | ||
187 | irq = mdesc_get_property(hp, target, "tx-ino", NULL); | |
188 | if (irq) | |
189 | vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); | |
190 | ||
191 | irq = mdesc_get_property(hp, target, "rx-ino", NULL); | |
192 | if (irq) | |
193 | vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq); | |
194 | ||
195 | chan_id = mdesc_get_property(hp, target, "id", NULL); | |
196 | if (chan_id) | |
197 | vdev->channel_id = *chan_id; | |
198 | } | |
199 | } | |
200 | ||
201 | static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp, | |
e53e97ce DM |
202 | struct device *parent) |
203 | { | |
204 | const char *type, *compat; | |
205 | struct device_node *dp; | |
206 | struct vio_dev *vdev; | |
83292e0a | 207 | int err, tlen, clen; |
e53e97ce | 208 | |
83292e0a | 209 | type = mdesc_get_property(hp, mp, "device-type", &tlen); |
2c4f4ecb | 210 | if (!type) { |
83292e0a DM |
211 | type = mdesc_get_property(hp, mp, "name", &tlen); |
212 | if (!type) { | |
43fdf274 | 213 | type = mdesc_node_name(hp, mp); |
83292e0a DM |
214 | tlen = strlen(type) + 1; |
215 | } | |
216 | } | |
217 | if (tlen > VIO_MAX_TYPE_LEN) { | |
218 | printk(KERN_ERR "VIO: Type string [%s] is too long.\n", | |
219 | type); | |
220 | return NULL; | |
2c4f4ecb | 221 | } |
83292e0a | 222 | |
43fdf274 | 223 | compat = mdesc_get_property(hp, mp, "device-type", &clen); |
83292e0a DM |
224 | if (!compat) { |
225 | clen = 0; | |
226 | } else if (clen > VIO_MAX_COMPAT_LEN) { | |
227 | printk(KERN_ERR "VIO: Compat len %d for [%s] is too long.\n", | |
228 | clen, type); | |
229 | return NULL; | |
230 | } | |
e53e97ce DM |
231 | |
232 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); | |
233 | if (!vdev) { | |
234 | printk(KERN_ERR "VIO: Could not allocate vio_dev\n"); | |
235 | return NULL; | |
236 | } | |
237 | ||
238 | vdev->mp = mp; | |
83292e0a DM |
239 | memcpy(vdev->type, type, tlen); |
240 | if (compat) | |
241 | memcpy(vdev->compat, compat, clen); | |
242 | else | |
243 | memset(vdev->compat, 0, sizeof(vdev->compat)); | |
e53e97ce DM |
244 | vdev->compat_len = clen; |
245 | ||
43fdf274 DM |
246 | vdev->channel_id = ~0UL; |
247 | vdev->tx_irq = ~0; | |
248 | vdev->rx_irq = ~0; | |
e53e97ce | 249 | |
43fdf274 | 250 | vio_fill_channel_info(hp, mp, vdev); |
e53e97ce | 251 | |
43fdf274 | 252 | snprintf(vdev->dev.bus_id, BUS_ID_SIZE, "%lx", mp); |
e53e97ce DM |
253 | vdev->dev.parent = parent; |
254 | vdev->dev.bus = &vio_bus_type; | |
255 | vdev->dev.release = vio_dev_release; | |
256 | ||
257 | if (parent == NULL) { | |
258 | dp = cdev_node; | |
259 | } else if (to_vio_dev(parent) == root_vdev) { | |
260 | dp = of_get_next_child(cdev_node, NULL); | |
261 | while (dp) { | |
262 | if (!strcmp(dp->type, type)) | |
263 | break; | |
264 | ||
265 | dp = of_get_next_child(cdev_node, dp); | |
266 | } | |
267 | } else { | |
268 | dp = to_vio_dev(parent)->dp; | |
269 | } | |
270 | vdev->dp = dp; | |
271 | ||
272 | err = device_register(&vdev->dev); | |
273 | if (err) { | |
274 | printk(KERN_ERR "VIO: Could not register device %s, err=%d\n", | |
275 | vdev->dev.bus_id, err); | |
276 | kfree(vdev); | |
277 | return NULL; | |
278 | } | |
279 | if (vdev->dp) | |
280 | err = sysfs_create_file(&vdev->dev.kobj, | |
281 | &dev_attr_obppath.attr); | |
282 | ||
283 | return vdev; | |
284 | } | |
285 | ||
43fdf274 | 286 | static void walk_tree(struct mdesc_handle *hp, u64 n, struct vio_dev *parent) |
e53e97ce | 287 | { |
43fdf274 | 288 | u64 a; |
e53e97ce | 289 | |
43fdf274 | 290 | mdesc_for_each_arc(a, hp, n, MDESC_ARC_TYPE_FWD) { |
e53e97ce | 291 | struct vio_dev *vdev; |
43fdf274 | 292 | u64 target; |
e53e97ce | 293 | |
43fdf274 DM |
294 | target = mdesc_arc_target(hp, a); |
295 | vdev = vio_create_one(hp, target, &parent->dev); | |
296 | if (vdev) | |
297 | walk_tree(hp, target, vdev); | |
e53e97ce DM |
298 | } |
299 | } | |
300 | ||
43fdf274 | 301 | static void create_devices(struct mdesc_handle *hp, u64 root) |
e53e97ce | 302 | { |
43fdf274 | 303 | u64 mp; |
2c4f4ecb | 304 | |
43fdf274 | 305 | root_vdev = vio_create_one(hp, root, NULL); |
e53e97ce DM |
306 | if (!root_vdev) { |
307 | printk(KERN_ERR "VIO: Coult not create root device.\n"); | |
308 | return; | |
309 | } | |
310 | ||
43fdf274 | 311 | walk_tree(hp, root, root_vdev); |
2c4f4ecb DM |
312 | |
313 | /* Domain services is odd as it doesn't sit underneath the | |
314 | * channel-devices node, so we plug it in manually. | |
315 | */ | |
43fdf274 DM |
316 | mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "domain-services"); |
317 | if (mp != MDESC_NODE_NULL) { | |
318 | struct vio_dev *parent = vio_create_one(hp, mp, | |
319 | &root_vdev->dev); | |
2c4f4ecb DM |
320 | |
321 | if (parent) | |
43fdf274 | 322 | walk_tree(hp, mp, parent); |
2c4f4ecb | 323 | } |
e53e97ce DM |
324 | } |
325 | ||
326 | const char *channel_devices_node = "channel-devices"; | |
327 | const char *channel_devices_compat = "SUNW,sun4v-channel-devices"; | |
328 | const char *cfg_handle_prop = "cfg-handle"; | |
329 | ||
330 | static int __init vio_init(void) | |
331 | { | |
43fdf274 | 332 | struct mdesc_handle *hp; |
e53e97ce DM |
333 | const char *compat; |
334 | const u64 *cfg_handle; | |
335 | int err, len; | |
43fdf274 DM |
336 | u64 root; |
337 | ||
f8be339c DM |
338 | err = bus_register(&vio_bus_type); |
339 | if (err) { | |
340 | printk(KERN_ERR "VIO: Could not register bus type err=%d\n", | |
341 | err); | |
342 | return err; | |
343 | } | |
344 | ||
43fdf274 DM |
345 | hp = mdesc_grab(); |
346 | if (!hp) | |
347 | return 0; | |
e53e97ce | 348 | |
43fdf274 DM |
349 | root = mdesc_node_by_name(hp, MDESC_NODE_NULL, channel_devices_node); |
350 | if (root == MDESC_NODE_NULL) { | |
e53e97ce | 351 | printk(KERN_INFO "VIO: No channel-devices MDESC node.\n"); |
43fdf274 | 352 | mdesc_release(hp); |
e53e97ce DM |
353 | return 0; |
354 | } | |
355 | ||
356 | cdev_node = of_find_node_by_name(NULL, "channel-devices"); | |
43fdf274 | 357 | err = -ENODEV; |
e53e97ce DM |
358 | if (!cdev_node) { |
359 | printk(KERN_INFO "VIO: No channel-devices OBP node.\n"); | |
43fdf274 | 360 | goto out_release; |
e53e97ce DM |
361 | } |
362 | ||
43fdf274 | 363 | compat = mdesc_get_property(hp, root, "compatible", &len); |
e53e97ce DM |
364 | if (!compat) { |
365 | printk(KERN_ERR "VIO: Channel devices lacks compatible " | |
366 | "property\n"); | |
43fdf274 | 367 | goto out_release; |
e53e97ce DM |
368 | } |
369 | if (!find_in_proplist(compat, channel_devices_compat, len)) { | |
370 | printk(KERN_ERR "VIO: Channel devices node lacks (%s) " | |
371 | "compat entry.\n", channel_devices_compat); | |
43fdf274 | 372 | goto out_release; |
e53e97ce DM |
373 | } |
374 | ||
43fdf274 | 375 | cfg_handle = mdesc_get_property(hp, root, cfg_handle_prop, NULL); |
e53e97ce DM |
376 | if (!cfg_handle) { |
377 | printk(KERN_ERR "VIO: Channel devices lacks %s property\n", | |
378 | cfg_handle_prop); | |
43fdf274 | 379 | goto out_release; |
e53e97ce DM |
380 | } |
381 | ||
382 | cdev_cfg_handle = *cfg_handle; | |
383 | ||
43fdf274 DM |
384 | create_devices(hp, root); |
385 | ||
386 | mdesc_release(hp); | |
e53e97ce DM |
387 | |
388 | return 0; | |
43fdf274 DM |
389 | |
390 | out_release: | |
391 | mdesc_release(hp); | |
392 | return err; | |
e53e97ce DM |
393 | } |
394 | ||
395 | postcore_initcall(vio_init); |