Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * IBM PowerPC Virtual I/O Infrastructure Support. | |
3 | * | |
19dbd0f6 | 4 | * Copyright (c) 2003-2005 IBM Corp. |
1da177e4 LT |
5 | * Dave Engebretsen engebret@us.ibm.com |
6 | * Santiago Leon santil@us.ibm.com | |
7 | * Hollis Blanchard <hollisb@us.ibm.com> | |
19dbd0f6 | 8 | * Stephen Rothwell |
1da177e4 LT |
9 | * |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
c7f0e8cb SR |
16 | #include <linux/types.h> |
17 | #include <linux/device.h> | |
1da177e4 LT |
18 | #include <linux/init.h> |
19 | #include <linux/console.h> | |
1da177e4 | 20 | #include <linux/module.h> |
1da177e4 LT |
21 | #include <linux/mm.h> |
22 | #include <linux/dma-mapping.h> | |
c7f0e8cb SR |
23 | #include <linux/kobject.h> |
24 | ||
1da177e4 LT |
25 | #include <asm/iommu.h> |
26 | #include <asm/dma.h> | |
1da177e4 | 27 | #include <asm/vio.h> |
143dcec2 | 28 | #include <asm/prom.h> |
e10fa773 | 29 | #include <asm/firmware.h> |
c7f0e8cb SR |
30 | #include <asm/tce.h> |
31 | #include <asm/abs_addr.h> | |
32 | #include <asm/page.h> | |
33 | #include <asm/hvcall.h> | |
34 | #include <asm/iseries/vio.h> | |
35 | #include <asm/iseries/hv_types.h> | |
36 | #include <asm/iseries/hv_lp_config.h> | |
37 | #include <asm/iseries/hv_call_xm.h> | |
38 | #include <asm/iseries/iommu.h> | |
39 | ||
40 | extern struct subsystem devices_subsys; /* needed for vio_find_name() */ | |
41 | ||
42 | static struct vio_dev vio_bus_device = { /* fake "parent" device */ | |
ac5b33c9 SR |
43 | .name = vio_bus_device.dev.bus_id, |
44 | .type = "", | |
ac5b33c9 SR |
45 | .dev.bus_id = "vio", |
46 | .dev.bus = &vio_bus_type, | |
1da177e4 | 47 | }; |
ac5b33c9 | 48 | |
c7f0e8cb SR |
49 | #ifdef CONFIG_PPC_ISERIES |
50 | struct device *iSeries_vio_dev = &vio_bus_device.dev; | |
51 | EXPORT_SYMBOL(iSeries_vio_dev); | |
52 | ||
53 | static struct iommu_table veth_iommu_table; | |
54 | static struct iommu_table vio_iommu_table; | |
55 | ||
56 | static void __init iommu_vio_init(void) | |
57 | { | |
58 | iommu_table_getparms_iSeries(255, 0, 0xff, &veth_iommu_table); | |
59 | veth_iommu_table.it_size /= 2; | |
60 | vio_iommu_table = veth_iommu_table; | |
61 | vio_iommu_table.it_offset += veth_iommu_table.it_size; | |
62 | ||
ca1588e7 | 63 | if (!iommu_init_table(&veth_iommu_table, -1)) |
c7f0e8cb | 64 | printk("Virtual Bus VETH TCE table failed.\n"); |
ca1588e7 | 65 | if (!iommu_init_table(&vio_iommu_table, -1)) |
c7f0e8cb SR |
66 | printk("Virtual Bus VIO TCE table failed.\n"); |
67 | } | |
68 | #endif | |
69 | ||
70 | static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev) | |
71 | { | |
72 | #ifdef CONFIG_PPC_ISERIES | |
73 | if (firmware_has_feature(FW_FEATURE_ISERIES)) { | |
1dc461f0 | 74 | if (strcmp(dev->type, "network") == 0) |
c7f0e8cb SR |
75 | return &veth_iommu_table; |
76 | return &vio_iommu_table; | |
77 | } else | |
78 | #endif | |
79 | { | |
a7f67bdf | 80 | const unsigned char *dma_window; |
4c76e0bc JK |
81 | struct iommu_table *tbl; |
82 | unsigned long offset, size; | |
c7f0e8cb | 83 | |
12d04eef BH |
84 | dma_window = get_property(dev->dev.archdata.of_node, |
85 | "ibm,my-dma-window", NULL); | |
c7f0e8cb SR |
86 | if (!dma_window) |
87 | return NULL; | |
88 | ||
4c76e0bc | 89 | tbl = kmalloc(sizeof(*tbl), GFP_KERNEL); |
c7f0e8cb | 90 | |
12d04eef BH |
91 | of_parse_dma_window(dev->dev.archdata.of_node, dma_window, |
92 | &tbl->it_index, &offset, &size); | |
c7f0e8cb SR |
93 | |
94 | /* TCE table size - measured in tce entries */ | |
5d2efba6 | 95 | tbl->it_size = size >> IOMMU_PAGE_SHIFT; |
c7f0e8cb | 96 | /* offset for VIO should always be 0 */ |
5d2efba6 | 97 | tbl->it_offset = offset >> IOMMU_PAGE_SHIFT; |
4c76e0bc JK |
98 | tbl->it_busno = 0; |
99 | tbl->it_type = TCE_VB; | |
c7f0e8cb | 100 | |
ca1588e7 | 101 | return iommu_init_table(tbl, -1); |
c7f0e8cb SR |
102 | } |
103 | } | |
1da177e4 | 104 | |
e10fa773 SR |
105 | /** |
106 | * vio_match_device: - Tell if a VIO device has a matching | |
107 | * VIO device id structure. | |
108 | * @ids: array of VIO device id structures to search in | |
109 | * @dev: the VIO device structure to match against | |
110 | * | |
111 | * Used by a driver to check whether a VIO device present in the | |
112 | * system is in its list of supported devices. Returns the matching | |
113 | * vio_device_id structure or NULL if there is no match. | |
114 | */ | |
115 | static const struct vio_device_id *vio_match_device( | |
116 | const struct vio_device_id *ids, const struct vio_dev *dev) | |
117 | { | |
118 | while (ids->type[0] != '\0') { | |
dd721ffd | 119 | if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) && |
12d04eef BH |
120 | device_is_compatible(dev->dev.archdata.of_node, |
121 | ids->compat)) | |
e10fa773 SR |
122 | return ids; |
123 | ids++; | |
124 | } | |
125 | return NULL; | |
126 | } | |
127 | ||
5c0b4b87 SR |
128 | /* |
129 | * Convert from struct device to struct vio_dev and pass to driver. | |
1da177e4 | 130 | * dev->driver has already been set by generic code because vio_bus_match |
5c0b4b87 SR |
131 | * succeeded. |
132 | */ | |
1da177e4 LT |
133 | static int vio_bus_probe(struct device *dev) |
134 | { | |
135 | struct vio_dev *viodev = to_vio_dev(dev); | |
136 | struct vio_driver *viodrv = to_vio_driver(dev->driver); | |
137 | const struct vio_device_id *id; | |
138 | int error = -ENODEV; | |
139 | ||
1da177e4 LT |
140 | if (!viodrv->probe) |
141 | return error; | |
142 | ||
143 | id = vio_match_device(viodrv->id_table, viodev); | |
5c0b4b87 | 144 | if (id) |
1da177e4 | 145 | error = viodrv->probe(viodev, id); |
1da177e4 LT |
146 | |
147 | return error; | |
148 | } | |
149 | ||
150 | /* convert from struct device to struct vio_dev and pass to driver. */ | |
151 | static int vio_bus_remove(struct device *dev) | |
152 | { | |
153 | struct vio_dev *viodev = to_vio_dev(dev); | |
154 | struct vio_driver *viodrv = to_vio_driver(dev->driver); | |
155 | ||
5c0b4b87 | 156 | if (viodrv->remove) |
1da177e4 | 157 | return viodrv->remove(viodev); |
1da177e4 LT |
158 | |
159 | /* driver can't remove */ | |
160 | return 1; | |
161 | } | |
162 | ||
34060104 SR |
163 | /* convert from struct device to struct vio_dev and pass to driver. */ |
164 | static void vio_bus_shutdown(struct device *dev) | |
165 | { | |
166 | struct vio_dev *viodev = to_vio_dev(dev); | |
167 | struct vio_driver *viodrv = to_vio_driver(dev->driver); | |
168 | ||
2f53a80f | 169 | if (dev->driver && viodrv->shutdown) |
34060104 SR |
170 | viodrv->shutdown(viodev); |
171 | } | |
172 | ||
1da177e4 LT |
173 | /** |
174 | * vio_register_driver: - Register a new vio driver | |
175 | * @drv: The vio_driver structure to be registered. | |
176 | */ | |
177 | int vio_register_driver(struct vio_driver *viodrv) | |
178 | { | |
179 | printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__, | |
6fdf5392 | 180 | viodrv->driver.name); |
1da177e4 LT |
181 | |
182 | /* fill in 'struct driver' fields */ | |
1da177e4 | 183 | viodrv->driver.bus = &vio_bus_type; |
1da177e4 LT |
184 | |
185 | return driver_register(&viodrv->driver); | |
186 | } | |
187 | EXPORT_SYMBOL(vio_register_driver); | |
188 | ||
189 | /** | |
190 | * vio_unregister_driver - Remove registration of vio driver. | |
191 | * @driver: The vio_driver struct to be removed form registration | |
192 | */ | |
193 | void vio_unregister_driver(struct vio_driver *viodrv) | |
194 | { | |
195 | driver_unregister(&viodrv->driver); | |
196 | } | |
197 | EXPORT_SYMBOL(vio_unregister_driver); | |
198 | ||
c7f0e8cb SR |
199 | /* vio_dev refcount hit 0 */ |
200 | static void __devinit vio_dev_release(struct device *dev) | |
201 | { | |
12d04eef BH |
202 | if (dev->archdata.of_node) { |
203 | /* XXX should free TCE table */ | |
204 | of_node_put(dev->archdata.of_node); | |
c7f0e8cb SR |
205 | } |
206 | kfree(to_vio_dev(dev)); | |
207 | } | |
208 | ||
1da177e4 | 209 | /** |
e10fa773 SR |
210 | * vio_register_device_node: - Register a new vio device. |
211 | * @of_node: The OF node for this device. | |
1da177e4 | 212 | * |
e10fa773 | 213 | * Creates and initializes a vio_dev structure from the data in |
12d04eef | 214 | * of_node and adds it to the list of virtual devices. |
e10fa773 SR |
215 | * Returns a pointer to the created vio_dev or NULL if node has |
216 | * NULL device_type or compatible fields. | |
1da177e4 | 217 | */ |
e10fa773 | 218 | struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node) |
1da177e4 | 219 | { |
e10fa773 | 220 | struct vio_dev *viodev; |
a7f67bdf | 221 | const unsigned int *unit_address; |
e10fa773 SR |
222 | |
223 | /* we need the 'device_type' property, in order to match with drivers */ | |
224 | if (of_node->type == NULL) { | |
225 | printk(KERN_WARNING "%s: node %s missing 'device_type'\n", | |
226 | __FUNCTION__, | |
227 | of_node->name ? of_node->name : "<unknown>"); | |
228 | return NULL; | |
1da177e4 | 229 | } |
e10fa773 | 230 | |
a7f67bdf | 231 | unit_address = get_property(of_node, "reg", NULL); |
e10fa773 SR |
232 | if (unit_address == NULL) { |
233 | printk(KERN_WARNING "%s: node %s missing 'reg'\n", | |
234 | __FUNCTION__, | |
235 | of_node->name ? of_node->name : "<unknown>"); | |
236 | return NULL; | |
237 | } | |
238 | ||
239 | /* allocate a vio_dev for this node */ | |
240 | viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL); | |
241 | if (viodev == NULL) | |
242 | return NULL; | |
243 | ||
0ebfff14 | 244 | viodev->irq = irq_of_parse_and_map(of_node, 0); |
e10fa773 SR |
245 | |
246 | snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address); | |
247 | viodev->name = of_node->name; | |
248 | viodev->type = of_node->type; | |
249 | viodev->unit_address = *unit_address; | |
250 | if (firmware_has_feature(FW_FEATURE_ISERIES)) { | |
a7f67bdf | 251 | unit_address = get_property(of_node, |
e10fa773 SR |
252 | "linux,unit_address", NULL); |
253 | if (unit_address != NULL) | |
254 | viodev->unit_address = *unit_address; | |
255 | } | |
12d04eef BH |
256 | viodev->dev.archdata.of_node = of_node_get(of_node); |
257 | viodev->dev.archdata.dma_ops = &dma_iommu_ops; | |
258 | viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev); | |
259 | viodev->dev.archdata.numa_node = of_node_to_nid(of_node); | |
c7f0e8cb SR |
260 | |
261 | /* init generic 'struct device' fields: */ | |
262 | viodev->dev.parent = &vio_bus_device.dev; | |
263 | viodev->dev.bus = &vio_bus_type; | |
264 | viodev->dev.release = vio_dev_release; | |
e10fa773 SR |
265 | |
266 | /* register with generic device framework */ | |
c7f0e8cb SR |
267 | if (device_register(&viodev->dev)) { |
268 | printk(KERN_ERR "%s: failed to register device %s\n", | |
269 | __FUNCTION__, viodev->dev.bus_id); | |
e10fa773 SR |
270 | /* XXX free TCE table */ |
271 | kfree(viodev); | |
272 | return NULL; | |
273 | } | |
274 | ||
275 | return viodev; | |
1da177e4 | 276 | } |
e10fa773 | 277 | EXPORT_SYMBOL(vio_register_device_node); |
1da177e4 | 278 | |
1da177e4 LT |
279 | /** |
280 | * vio_bus_init: - Initialize the virtual IO bus | |
281 | */ | |
c7f0e8cb | 282 | static int __init vio_bus_init(void) |
1da177e4 LT |
283 | { |
284 | int err; | |
e10fa773 | 285 | struct device_node *node_vroot; |
1da177e4 | 286 | |
c7f0e8cb SR |
287 | #ifdef CONFIG_PPC_ISERIES |
288 | if (firmware_has_feature(FW_FEATURE_ISERIES)) { | |
289 | iommu_vio_init(); | |
12d04eef BH |
290 | vio_bus_device.dev.archdata.dma_ops = &dma_iommu_ops; |
291 | vio_bus_device.dev.archdata.dma_data = &vio_iommu_table; | |
c7f0e8cb SR |
292 | iSeries_vio_dev = &vio_bus_device.dev; |
293 | } | |
12d04eef | 294 | #endif /* CONFIG_PPC_ISERIES */ |
6312236f | 295 | |
1da177e4 LT |
296 | err = bus_register(&vio_bus_type); |
297 | if (err) { | |
298 | printk(KERN_ERR "failed to register VIO bus\n"); | |
299 | return err; | |
300 | } | |
301 | ||
5c0b4b87 SR |
302 | /* |
303 | * The fake parent of all vio devices, just to give us | |
3e494c80 SR |
304 | * a nice directory |
305 | */ | |
ac5b33c9 | 306 | err = device_register(&vio_bus_device.dev); |
1da177e4 | 307 | if (err) { |
3e494c80 SR |
308 | printk(KERN_WARNING "%s: device_register returned %i\n", |
309 | __FUNCTION__, err); | |
1da177e4 LT |
310 | return err; |
311 | } | |
312 | ||
e10fa773 SR |
313 | node_vroot = find_devices("vdevice"); |
314 | if (node_vroot) { | |
315 | struct device_node *of_node; | |
316 | ||
317 | /* | |
318 | * Create struct vio_devices for each virtual device in | |
319 | * the device tree. Drivers will associate with them later. | |
320 | */ | |
321 | for (of_node = node_vroot->child; of_node != NULL; | |
322 | of_node = of_node->sibling) { | |
323 | printk(KERN_DEBUG "%s: processing %p\n", | |
324 | __FUNCTION__, of_node); | |
325 | vio_register_device_node(of_node); | |
326 | } | |
327 | } | |
328 | ||
3e494c80 SR |
329 | return 0; |
330 | } | |
c7f0e8cb | 331 | __initcall(vio_bus_init); |
1da177e4 | 332 | |
e10fa773 | 333 | static ssize_t name_show(struct device *dev, |
5c0b4b87 | 334 | struct device_attribute *attr, char *buf) |
1da177e4 LT |
335 | { |
336 | return sprintf(buf, "%s\n", to_vio_dev(dev)->name); | |
337 | } | |
e10fa773 SR |
338 | |
339 | static ssize_t devspec_show(struct device *dev, | |
340 | struct device_attribute *attr, char *buf) | |
341 | { | |
12d04eef | 342 | struct device_node *of_node = dev->archdata.of_node; |
e10fa773 SR |
343 | |
344 | return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none"); | |
345 | } | |
346 | ||
347 | static struct device_attribute vio_dev_attrs[] = { | |
348 | __ATTR_RO(name), | |
349 | __ATTR_RO(devspec), | |
350 | __ATTR_NULL | |
351 | }; | |
1da177e4 | 352 | |
1da177e4 LT |
353 | void __devinit vio_unregister_device(struct vio_dev *viodev) |
354 | { | |
1da177e4 LT |
355 | device_unregister(&viodev->dev); |
356 | } | |
357 | EXPORT_SYMBOL(vio_unregister_device); | |
358 | ||
1da177e4 LT |
359 | static int vio_bus_match(struct device *dev, struct device_driver *drv) |
360 | { | |
361 | const struct vio_dev *vio_dev = to_vio_dev(dev); | |
362 | struct vio_driver *vio_drv = to_vio_driver(drv); | |
363 | const struct vio_device_id *ids = vio_drv->id_table; | |
1da177e4 | 364 | |
5c0b4b87 | 365 | return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL); |
1da177e4 LT |
366 | } |
367 | ||
143dcec2 OH |
368 | static int vio_hotplug(struct device *dev, char **envp, int num_envp, |
369 | char *buffer, int buffer_size) | |
370 | { | |
371 | const struct vio_dev *vio_dev = to_vio_dev(dev); | |
12d04eef | 372 | struct device_node *dn; |
a7f67bdf | 373 | const char *cp; |
143dcec2 OH |
374 | int length; |
375 | ||
376 | if (!num_envp) | |
377 | return -ENOMEM; | |
378 | ||
12d04eef | 379 | dn = dev->archdata.of_node; |
e10fa773 | 380 | if (!dn) |
143dcec2 | 381 | return -ENODEV; |
a7f67bdf | 382 | cp = get_property(dn, "compatible", &length); |
143dcec2 OH |
383 | if (!cp) |
384 | return -ENODEV; | |
385 | ||
386 | envp[0] = buffer; | |
387 | length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s", | |
388 | vio_dev->type, cp); | |
e10fa773 | 389 | if ((buffer_size - length) <= 0) |
143dcec2 OH |
390 | return -ENOMEM; |
391 | envp[1] = NULL; | |
392 | return 0; | |
393 | } | |
394 | ||
1da177e4 LT |
395 | struct bus_type vio_bus_type = { |
396 | .name = "vio", | |
e10fa773 | 397 | .dev_attrs = vio_dev_attrs, |
312c004d | 398 | .uevent = vio_hotplug, |
1da177e4 | 399 | .match = vio_bus_match, |
2f53a80f RK |
400 | .probe = vio_bus_probe, |
401 | .remove = vio_bus_remove, | |
402 | .shutdown = vio_bus_shutdown, | |
1da177e4 | 403 | }; |
e10fa773 SR |
404 | |
405 | /** | |
406 | * vio_get_attribute: - get attribute for virtual device | |
407 | * @vdev: The vio device to get property. | |
408 | * @which: The property/attribute to be extracted. | |
409 | * @length: Pointer to length of returned data size (unused if NULL). | |
410 | * | |
411 | * Calls prom.c's get_property() to return the value of the | |
412 | * attribute specified by @which | |
413 | */ | |
414 | const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length) | |
415 | { | |
12d04eef | 416 | return get_property(vdev->dev.archdata.of_node, which, length); |
e10fa773 SR |
417 | } |
418 | EXPORT_SYMBOL(vio_get_attribute); | |
c7f0e8cb SR |
419 | |
420 | #ifdef CONFIG_PPC_PSERIES | |
421 | /* vio_find_name() - internal because only vio.c knows how we formatted the | |
422 | * kobject name | |
423 | * XXX once vio_bus_type.devices is actually used as a kset in | |
424 | * drivers/base/bus.c, this function should be removed in favor of | |
425 | * "device_find(kobj_name, &vio_bus_type)" | |
426 | */ | |
427 | static struct vio_dev *vio_find_name(const char *kobj_name) | |
428 | { | |
429 | struct kobject *found; | |
430 | ||
431 | found = kset_find_obj(&devices_subsys.kset, kobj_name); | |
432 | if (!found) | |
433 | return NULL; | |
434 | ||
435 | return to_vio_dev(container_of(found, struct device, kobj)); | |
436 | } | |
437 | ||
438 | /** | |
439 | * vio_find_node - find an already-registered vio_dev | |
440 | * @vnode: device_node of the virtual device we're looking for | |
441 | */ | |
442 | struct vio_dev *vio_find_node(struct device_node *vnode) | |
443 | { | |
a7f67bdf | 444 | const uint32_t *unit_address; |
c7f0e8cb SR |
445 | char kobj_name[BUS_ID_SIZE]; |
446 | ||
447 | /* construct the kobject name from the device node */ | |
a7f67bdf | 448 | unit_address = get_property(vnode, "reg", NULL); |
c7f0e8cb SR |
449 | if (!unit_address) |
450 | return NULL; | |
451 | snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address); | |
452 | ||
453 | return vio_find_name(kobj_name); | |
454 | } | |
455 | EXPORT_SYMBOL(vio_find_node); | |
456 | ||
457 | int vio_enable_interrupts(struct vio_dev *dev) | |
458 | { | |
459 | int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE); | |
460 | if (rc != H_SUCCESS) | |
461 | printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc); | |
462 | return rc; | |
463 | } | |
464 | EXPORT_SYMBOL(vio_enable_interrupts); | |
465 | ||
466 | int vio_disable_interrupts(struct vio_dev *dev) | |
467 | { | |
468 | int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE); | |
469 | if (rc != H_SUCCESS) | |
470 | printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc); | |
471 | return rc; | |
472 | } | |
473 | EXPORT_SYMBOL(vio_disable_interrupts); | |
474 | #endif /* CONFIG_PPC_PSERIES */ |