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 | ||
823bccfc | 40 | extern struct kset devices_subsys; /* needed for vio_find_name() */ |
c7f0e8cb | 41 | |
6fccab26 SR |
42 | static struct bus_type vio_bus_type; |
43 | ||
c7f0e8cb | 44 | static struct vio_dev vio_bus_device = { /* fake "parent" device */ |
ac5b33c9 SR |
45 | .name = vio_bus_device.dev.bus_id, |
46 | .type = "", | |
ac5b33c9 SR |
47 | .dev.bus_id = "vio", |
48 | .dev.bus = &vio_bus_type, | |
1da177e4 | 49 | }; |
ac5b33c9 | 50 | |
c7f0e8cb SR |
51 | static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev) |
52 | { | |
dd9b67ab SR |
53 | const unsigned char *dma_window; |
54 | struct iommu_table *tbl; | |
55 | unsigned long offset, size; | |
56 | ||
57 | if (firmware_has_feature(FW_FEATURE_ISERIES)) | |
58 | return vio_build_iommu_table_iseries(dev); | |
c7f0e8cb | 59 | |
dd9b67ab SR |
60 | dma_window = of_get_property(dev->dev.archdata.of_node, |
61 | "ibm,my-dma-window", NULL); | |
62 | if (!dma_window) | |
63 | return NULL; | |
c7f0e8cb | 64 | |
dd9b67ab | 65 | tbl = kmalloc(sizeof(*tbl), GFP_KERNEL); |
c7f0e8cb | 66 | |
dd9b67ab SR |
67 | of_parse_dma_window(dev->dev.archdata.of_node, dma_window, |
68 | &tbl->it_index, &offset, &size); | |
c7f0e8cb | 69 | |
dd9b67ab SR |
70 | /* TCE table size - measured in tce entries */ |
71 | tbl->it_size = size >> IOMMU_PAGE_SHIFT; | |
72 | /* offset for VIO should always be 0 */ | |
73 | tbl->it_offset = offset >> IOMMU_PAGE_SHIFT; | |
74 | tbl->it_busno = 0; | |
75 | tbl->it_type = TCE_VB; | |
c7f0e8cb | 76 | |
dd9b67ab | 77 | return iommu_init_table(tbl, -1); |
c7f0e8cb | 78 | } |
1da177e4 | 79 | |
e10fa773 SR |
80 | /** |
81 | * vio_match_device: - Tell if a VIO device has a matching | |
82 | * VIO device id structure. | |
83 | * @ids: array of VIO device id structures to search in | |
84 | * @dev: the VIO device structure to match against | |
85 | * | |
86 | * Used by a driver to check whether a VIO device present in the | |
87 | * system is in its list of supported devices. Returns the matching | |
88 | * vio_device_id structure or NULL if there is no match. | |
89 | */ | |
90 | static const struct vio_device_id *vio_match_device( | |
91 | const struct vio_device_id *ids, const struct vio_dev *dev) | |
92 | { | |
93 | while (ids->type[0] != '\0') { | |
dd721ffd | 94 | if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) && |
55b61fec | 95 | of_device_is_compatible(dev->dev.archdata.of_node, |
12d04eef | 96 | ids->compat)) |
e10fa773 SR |
97 | return ids; |
98 | ids++; | |
99 | } | |
100 | return NULL; | |
101 | } | |
102 | ||
5c0b4b87 SR |
103 | /* |
104 | * Convert from struct device to struct vio_dev and pass to driver. | |
1da177e4 | 105 | * dev->driver has already been set by generic code because vio_bus_match |
5c0b4b87 SR |
106 | * succeeded. |
107 | */ | |
1da177e4 LT |
108 | static int vio_bus_probe(struct device *dev) |
109 | { | |
110 | struct vio_dev *viodev = to_vio_dev(dev); | |
111 | struct vio_driver *viodrv = to_vio_driver(dev->driver); | |
112 | const struct vio_device_id *id; | |
113 | int error = -ENODEV; | |
114 | ||
1da177e4 LT |
115 | if (!viodrv->probe) |
116 | return error; | |
117 | ||
118 | id = vio_match_device(viodrv->id_table, viodev); | |
5c0b4b87 | 119 | if (id) |
1da177e4 | 120 | error = viodrv->probe(viodev, id); |
1da177e4 LT |
121 | |
122 | return error; | |
123 | } | |
124 | ||
125 | /* convert from struct device to struct vio_dev and pass to driver. */ | |
126 | static int vio_bus_remove(struct device *dev) | |
127 | { | |
128 | struct vio_dev *viodev = to_vio_dev(dev); | |
129 | struct vio_driver *viodrv = to_vio_driver(dev->driver); | |
130 | ||
5c0b4b87 | 131 | if (viodrv->remove) |
1da177e4 | 132 | return viodrv->remove(viodev); |
1da177e4 LT |
133 | |
134 | /* driver can't remove */ | |
135 | return 1; | |
136 | } | |
137 | ||
138 | /** | |
139 | * vio_register_driver: - Register a new vio driver | |
140 | * @drv: The vio_driver structure to be registered. | |
141 | */ | |
142 | int vio_register_driver(struct vio_driver *viodrv) | |
143 | { | |
144 | printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__, | |
6fdf5392 | 145 | viodrv->driver.name); |
1da177e4 LT |
146 | |
147 | /* fill in 'struct driver' fields */ | |
1da177e4 | 148 | viodrv->driver.bus = &vio_bus_type; |
1da177e4 LT |
149 | |
150 | return driver_register(&viodrv->driver); | |
151 | } | |
152 | EXPORT_SYMBOL(vio_register_driver); | |
153 | ||
154 | /** | |
155 | * vio_unregister_driver - Remove registration of vio driver. | |
156 | * @driver: The vio_driver struct to be removed form registration | |
157 | */ | |
158 | void vio_unregister_driver(struct vio_driver *viodrv) | |
159 | { | |
160 | driver_unregister(&viodrv->driver); | |
161 | } | |
162 | EXPORT_SYMBOL(vio_unregister_driver); | |
163 | ||
c7f0e8cb SR |
164 | /* vio_dev refcount hit 0 */ |
165 | static void __devinit vio_dev_release(struct device *dev) | |
166 | { | |
6690faeb MK |
167 | /* XXX should free TCE table */ |
168 | of_node_put(dev->archdata.of_node); | |
c7f0e8cb SR |
169 | kfree(to_vio_dev(dev)); |
170 | } | |
171 | ||
1da177e4 | 172 | /** |
e10fa773 SR |
173 | * vio_register_device_node: - Register a new vio device. |
174 | * @of_node: The OF node for this device. | |
1da177e4 | 175 | * |
e10fa773 | 176 | * Creates and initializes a vio_dev structure from the data in |
12d04eef | 177 | * of_node and adds it to the list of virtual devices. |
e10fa773 SR |
178 | * Returns a pointer to the created vio_dev or NULL if node has |
179 | * NULL device_type or compatible fields. | |
1da177e4 | 180 | */ |
e10fa773 | 181 | struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node) |
1da177e4 | 182 | { |
e10fa773 | 183 | struct vio_dev *viodev; |
a7f67bdf | 184 | const unsigned int *unit_address; |
e10fa773 SR |
185 | |
186 | /* we need the 'device_type' property, in order to match with drivers */ | |
187 | if (of_node->type == NULL) { | |
188 | printk(KERN_WARNING "%s: node %s missing 'device_type'\n", | |
189 | __FUNCTION__, | |
190 | of_node->name ? of_node->name : "<unknown>"); | |
191 | return NULL; | |
1da177e4 | 192 | } |
e10fa773 | 193 | |
e2eb6392 | 194 | unit_address = of_get_property(of_node, "reg", NULL); |
e10fa773 SR |
195 | if (unit_address == NULL) { |
196 | printk(KERN_WARNING "%s: node %s missing 'reg'\n", | |
197 | __FUNCTION__, | |
198 | of_node->name ? of_node->name : "<unknown>"); | |
199 | return NULL; | |
200 | } | |
201 | ||
202 | /* allocate a vio_dev for this node */ | |
203 | viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL); | |
204 | if (viodev == NULL) | |
205 | return NULL; | |
206 | ||
0ebfff14 | 207 | viodev->irq = irq_of_parse_and_map(of_node, 0); |
e10fa773 SR |
208 | |
209 | snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address); | |
210 | viodev->name = of_node->name; | |
211 | viodev->type = of_node->type; | |
212 | viodev->unit_address = *unit_address; | |
213 | if (firmware_has_feature(FW_FEATURE_ISERIES)) { | |
e2eb6392 | 214 | unit_address = of_get_property(of_node, |
e10fa773 SR |
215 | "linux,unit_address", NULL); |
216 | if (unit_address != NULL) | |
217 | viodev->unit_address = *unit_address; | |
218 | } | |
12d04eef BH |
219 | viodev->dev.archdata.of_node = of_node_get(of_node); |
220 | viodev->dev.archdata.dma_ops = &dma_iommu_ops; | |
221 | viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev); | |
222 | viodev->dev.archdata.numa_node = of_node_to_nid(of_node); | |
c7f0e8cb SR |
223 | |
224 | /* init generic 'struct device' fields: */ | |
225 | viodev->dev.parent = &vio_bus_device.dev; | |
226 | viodev->dev.bus = &vio_bus_type; | |
227 | viodev->dev.release = vio_dev_release; | |
e10fa773 SR |
228 | |
229 | /* register with generic device framework */ | |
c7f0e8cb SR |
230 | if (device_register(&viodev->dev)) { |
231 | printk(KERN_ERR "%s: failed to register device %s\n", | |
232 | __FUNCTION__, viodev->dev.bus_id); | |
e10fa773 SR |
233 | /* XXX free TCE table */ |
234 | kfree(viodev); | |
235 | return NULL; | |
236 | } | |
237 | ||
238 | return viodev; | |
1da177e4 | 239 | } |
e10fa773 | 240 | EXPORT_SYMBOL(vio_register_device_node); |
1da177e4 | 241 | |
1da177e4 LT |
242 | /** |
243 | * vio_bus_init: - Initialize the virtual IO bus | |
244 | */ | |
c7f0e8cb | 245 | static int __init vio_bus_init(void) |
1da177e4 LT |
246 | { |
247 | int err; | |
e10fa773 | 248 | struct device_node *node_vroot; |
1da177e4 LT |
249 | |
250 | err = bus_register(&vio_bus_type); | |
251 | if (err) { | |
252 | printk(KERN_ERR "failed to register VIO bus\n"); | |
253 | return err; | |
254 | } | |
255 | ||
5c0b4b87 SR |
256 | /* |
257 | * The fake parent of all vio devices, just to give us | |
3e494c80 SR |
258 | * a nice directory |
259 | */ | |
ac5b33c9 | 260 | err = device_register(&vio_bus_device.dev); |
1da177e4 | 261 | if (err) { |
3e494c80 SR |
262 | printk(KERN_WARNING "%s: device_register returned %i\n", |
263 | __FUNCTION__, err); | |
1da177e4 LT |
264 | return err; |
265 | } | |
266 | ||
30686ba6 | 267 | node_vroot = of_find_node_by_name(NULL, "vdevice"); |
e10fa773 SR |
268 | if (node_vroot) { |
269 | struct device_node *of_node; | |
270 | ||
271 | /* | |
272 | * Create struct vio_devices for each virtual device in | |
273 | * the device tree. Drivers will associate with them later. | |
274 | */ | |
275 | for (of_node = node_vroot->child; of_node != NULL; | |
c5467262 | 276 | of_node = of_node->sibling) |
e10fa773 | 277 | vio_register_device_node(of_node); |
30686ba6 | 278 | of_node_put(node_vroot); |
e10fa773 SR |
279 | } |
280 | ||
3e494c80 SR |
281 | return 0; |
282 | } | |
c7f0e8cb | 283 | __initcall(vio_bus_init); |
1da177e4 | 284 | |
e10fa773 | 285 | static ssize_t name_show(struct device *dev, |
5c0b4b87 | 286 | struct device_attribute *attr, char *buf) |
1da177e4 LT |
287 | { |
288 | return sprintf(buf, "%s\n", to_vio_dev(dev)->name); | |
289 | } | |
e10fa773 SR |
290 | |
291 | static ssize_t devspec_show(struct device *dev, | |
292 | struct device_attribute *attr, char *buf) | |
293 | { | |
12d04eef | 294 | struct device_node *of_node = dev->archdata.of_node; |
e10fa773 SR |
295 | |
296 | return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none"); | |
297 | } | |
298 | ||
299 | static struct device_attribute vio_dev_attrs[] = { | |
300 | __ATTR_RO(name), | |
301 | __ATTR_RO(devspec), | |
302 | __ATTR_NULL | |
303 | }; | |
1da177e4 | 304 | |
1da177e4 LT |
305 | void __devinit vio_unregister_device(struct vio_dev *viodev) |
306 | { | |
1da177e4 LT |
307 | device_unregister(&viodev->dev); |
308 | } | |
309 | EXPORT_SYMBOL(vio_unregister_device); | |
310 | ||
1da177e4 LT |
311 | static int vio_bus_match(struct device *dev, struct device_driver *drv) |
312 | { | |
313 | const struct vio_dev *vio_dev = to_vio_dev(dev); | |
314 | struct vio_driver *vio_drv = to_vio_driver(drv); | |
315 | const struct vio_device_id *ids = vio_drv->id_table; | |
1da177e4 | 316 | |
5c0b4b87 | 317 | return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL); |
1da177e4 LT |
318 | } |
319 | ||
7eff2e7a | 320 | static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env) |
143dcec2 OH |
321 | { |
322 | const struct vio_dev *vio_dev = to_vio_dev(dev); | |
12d04eef | 323 | struct device_node *dn; |
a7f67bdf | 324 | const char *cp; |
143dcec2 | 325 | |
12d04eef | 326 | dn = dev->archdata.of_node; |
e10fa773 | 327 | if (!dn) |
143dcec2 | 328 | return -ENODEV; |
7eff2e7a | 329 | cp = of_get_property(dn, "compatible", NULL); |
143dcec2 OH |
330 | if (!cp) |
331 | return -ENODEV; | |
332 | ||
7eff2e7a | 333 | add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp); |
143dcec2 OH |
334 | return 0; |
335 | } | |
336 | ||
6fccab26 | 337 | static struct bus_type vio_bus_type = { |
1da177e4 | 338 | .name = "vio", |
e10fa773 | 339 | .dev_attrs = vio_dev_attrs, |
312c004d | 340 | .uevent = vio_hotplug, |
1da177e4 | 341 | .match = vio_bus_match, |
2f53a80f RK |
342 | .probe = vio_bus_probe, |
343 | .remove = vio_bus_remove, | |
1da177e4 | 344 | }; |
e10fa773 SR |
345 | |
346 | /** | |
347 | * vio_get_attribute: - get attribute for virtual device | |
348 | * @vdev: The vio device to get property. | |
349 | * @which: The property/attribute to be extracted. | |
350 | * @length: Pointer to length of returned data size (unused if NULL). | |
351 | * | |
e2eb6392 | 352 | * Calls prom.c's of_get_property() to return the value of the |
e10fa773 SR |
353 | * attribute specified by @which |
354 | */ | |
355 | const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length) | |
356 | { | |
e2eb6392 | 357 | return of_get_property(vdev->dev.archdata.of_node, which, length); |
e10fa773 SR |
358 | } |
359 | EXPORT_SYMBOL(vio_get_attribute); | |
c7f0e8cb SR |
360 | |
361 | #ifdef CONFIG_PPC_PSERIES | |
362 | /* vio_find_name() - internal because only vio.c knows how we formatted the | |
363 | * kobject name | |
364 | * XXX once vio_bus_type.devices is actually used as a kset in | |
365 | * drivers/base/bus.c, this function should be removed in favor of | |
366 | * "device_find(kobj_name, &vio_bus_type)" | |
367 | */ | |
368 | static struct vio_dev *vio_find_name(const char *kobj_name) | |
369 | { | |
370 | struct kobject *found; | |
371 | ||
823bccfc | 372 | found = kset_find_obj(&devices_subsys, kobj_name); |
c7f0e8cb SR |
373 | if (!found) |
374 | return NULL; | |
375 | ||
376 | return to_vio_dev(container_of(found, struct device, kobj)); | |
377 | } | |
378 | ||
379 | /** | |
380 | * vio_find_node - find an already-registered vio_dev | |
381 | * @vnode: device_node of the virtual device we're looking for | |
382 | */ | |
383 | struct vio_dev *vio_find_node(struct device_node *vnode) | |
384 | { | |
a7f67bdf | 385 | const uint32_t *unit_address; |
c7f0e8cb SR |
386 | char kobj_name[BUS_ID_SIZE]; |
387 | ||
388 | /* construct the kobject name from the device node */ | |
e2eb6392 | 389 | unit_address = of_get_property(vnode, "reg", NULL); |
c7f0e8cb SR |
390 | if (!unit_address) |
391 | return NULL; | |
392 | snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address); | |
393 | ||
394 | return vio_find_name(kobj_name); | |
395 | } | |
396 | EXPORT_SYMBOL(vio_find_node); | |
397 | ||
398 | int vio_enable_interrupts(struct vio_dev *dev) | |
399 | { | |
400 | int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE); | |
401 | if (rc != H_SUCCESS) | |
402 | printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc); | |
403 | return rc; | |
404 | } | |
405 | EXPORT_SYMBOL(vio_enable_interrupts); | |
406 | ||
407 | int vio_disable_interrupts(struct vio_dev *dev) | |
408 | { | |
409 | int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE); | |
410 | if (rc != H_SUCCESS) | |
411 | printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc); | |
412 | return rc; | |
413 | } | |
414 | EXPORT_SYMBOL(vio_disable_interrupts); | |
415 | #endif /* CONFIG_PPC_PSERIES */ |