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d7a30103 HS |
1 | /* |
2 | * IBM PowerPC IBM eBus Infrastructure Support. | |
3 | * | |
4 | * Copyright (c) 2005 IBM Corporation | |
6bccf755 | 5 | * Joachim Fenkes <fenkes@de.ibm.com> |
d7a30103 | 6 | * Heiko J Schick <schickhj@de.ibm.com> |
a8308800 | 7 | * |
d7a30103 HS |
8 | * All rights reserved. |
9 | * | |
a8308800 JF |
10 | * This source code is distributed under a dual license of GPL v2.0 and OpenIB |
11 | * BSD. | |
d7a30103 HS |
12 | * |
13 | * OpenIB BSD License | |
14 | * | |
a8308800 JF |
15 | * Redistribution and use in source and binary forms, with or without |
16 | * modification, are permitted provided that the following conditions are met: | |
d7a30103 | 17 | * |
a8308800 JF |
18 | * Redistributions of source code must retain the above copyright notice, this |
19 | * list of conditions and the following disclaimer. | |
d7a30103 | 20 | * |
a8308800 JF |
21 | * Redistributions in binary form must reproduce the above copyright notice, |
22 | * this list of conditions and the following disclaimer in the documentation | |
d7a30103 | 23 | * and/or other materials |
a8308800 | 24 | * provided with the distribution. |
d7a30103 | 25 | * |
a8308800 JF |
26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
27 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
30 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
31 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
d7a30103 HS |
32 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
33 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER | |
a8308800 JF |
34 | * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
35 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
d7a30103 HS |
36 | * POSSIBILITY OF SUCH DAMAGE. |
37 | */ | |
38 | ||
39 | #include <linux/init.h> | |
40 | #include <linux/console.h> | |
41 | #include <linux/kobject.h> | |
42 | #include <linux/dma-mapping.h> | |
43 | #include <linux/interrupt.h> | |
44 | #include <asm/ibmebus.h> | |
45 | #include <asm/abs_addr.h> | |
46 | ||
6bccf755 JF |
47 | #define MAX_LOC_CODE_LENGTH 80 |
48 | ||
49 | static struct device ibmebus_bus_device = { /* fake "parent" device */ | |
50 | .bus_id = "ibmebus", | |
d7a30103 HS |
51 | }; |
52 | ||
6bccf755 JF |
53 | struct bus_type ibmebus_bus_type; |
54 | ||
d7a30103 HS |
55 | static void *ibmebus_alloc_coherent(struct device *dev, |
56 | size_t size, | |
57 | dma_addr_t *dma_handle, | |
58 | gfp_t flag) | |
59 | { | |
60 | void *mem; | |
a8308800 | 61 | |
d7a30103 HS |
62 | mem = kmalloc(size, flag); |
63 | *dma_handle = (dma_addr_t)mem; | |
64 | ||
65 | return mem; | |
66 | } | |
67 | ||
68 | static void ibmebus_free_coherent(struct device *dev, | |
a8308800 | 69 | size_t size, void *vaddr, |
d7a30103 HS |
70 | dma_addr_t dma_handle) |
71 | { | |
72 | kfree(vaddr); | |
73 | } | |
74 | ||
75 | static dma_addr_t ibmebus_map_single(struct device *dev, | |
76 | void *ptr, | |
77 | size_t size, | |
78 | enum dma_data_direction direction) | |
79 | { | |
80 | return (dma_addr_t)(ptr); | |
81 | } | |
82 | ||
83 | static void ibmebus_unmap_single(struct device *dev, | |
84 | dma_addr_t dma_addr, | |
a8308800 | 85 | size_t size, |
d7a30103 HS |
86 | enum dma_data_direction direction) |
87 | { | |
88 | return; | |
89 | } | |
90 | ||
91 | static int ibmebus_map_sg(struct device *dev, | |
92 | struct scatterlist *sg, | |
93 | int nents, enum dma_data_direction direction) | |
94 | { | |
95 | int i; | |
a8308800 | 96 | |
d7a30103 | 97 | for (i = 0; i < nents; i++) { |
a8308800 | 98 | sg[i].dma_address = (dma_addr_t)page_address(sg[i].page) |
d7a30103 HS |
99 | + sg[i].offset; |
100 | sg[i].dma_length = sg[i].length; | |
101 | } | |
a8308800 | 102 | |
d7a30103 HS |
103 | return nents; |
104 | } | |
105 | ||
106 | static void ibmebus_unmap_sg(struct device *dev, | |
107 | struct scatterlist *sg, | |
108 | int nents, enum dma_data_direction direction) | |
109 | { | |
110 | return; | |
111 | } | |
112 | ||
113 | static int ibmebus_dma_supported(struct device *dev, u64 mask) | |
114 | { | |
115 | return 1; | |
116 | } | |
117 | ||
12d04eef | 118 | static struct dma_mapping_ops ibmebus_dma_ops = { |
d7a30103 HS |
119 | .alloc_coherent = ibmebus_alloc_coherent, |
120 | .free_coherent = ibmebus_free_coherent, | |
121 | .map_single = ibmebus_map_single, | |
122 | .unmap_single = ibmebus_unmap_single, | |
123 | .map_sg = ibmebus_map_sg, | |
124 | .unmap_sg = ibmebus_unmap_sg, | |
125 | .dma_supported = ibmebus_dma_supported, | |
126 | }; | |
127 | ||
128 | static int ibmebus_bus_probe(struct device *dev) | |
129 | { | |
130 | struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev); | |
131 | struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver); | |
132 | const struct of_device_id *id; | |
133 | int error = -ENODEV; | |
a8308800 | 134 | |
d7a30103 HS |
135 | if (!ibmebusdrv->probe) |
136 | return error; | |
a8308800 | 137 | |
d7a30103 HS |
138 | id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev); |
139 | if (id) { | |
140 | error = ibmebusdrv->probe(ibmebusdev, id); | |
141 | } | |
a8308800 | 142 | |
d7a30103 HS |
143 | return error; |
144 | } | |
145 | ||
146 | static int ibmebus_bus_remove(struct device *dev) | |
147 | { | |
148 | struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev); | |
149 | struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver); | |
a8308800 | 150 | |
d7a30103 HS |
151 | if (ibmebusdrv->remove) { |
152 | return ibmebusdrv->remove(ibmebusdev); | |
153 | } | |
a8308800 | 154 | |
d7a30103 HS |
155 | return 0; |
156 | } | |
157 | ||
158 | static void __devinit ibmebus_dev_release(struct device *dev) | |
159 | { | |
160 | of_node_put(to_ibmebus_dev(dev)->ofdev.node); | |
161 | kfree(to_ibmebus_dev(dev)); | |
162 | } | |
163 | ||
6bccf755 | 164 | static int __devinit ibmebus_register_device_common( |
a7f67bdf | 165 | struct ibmebus_dev *dev, const char *name) |
d7a30103 HS |
166 | { |
167 | int err = 0; | |
168 | ||
6bccf755 | 169 | dev->ofdev.dev.parent = &ibmebus_bus_device; |
d7a30103 HS |
170 | dev->ofdev.dev.bus = &ibmebus_bus_type; |
171 | dev->ofdev.dev.release = ibmebus_dev_release; | |
172 | ||
12d04eef BH |
173 | dev->ofdev.dev.archdata.of_node = dev->ofdev.node; |
174 | dev->ofdev.dev.archdata.dma_ops = &ibmebus_dma_ops; | |
175 | dev->ofdev.dev.archdata.numa_node = of_node_to_nid(dev->ofdev.node); | |
176 | ||
d7a30103 | 177 | /* An ibmebusdev is based on a of_device. We have to change the |
a8308800 JF |
178 | * bus type to use our own DMA mapping operations. |
179 | */ | |
d7a30103 HS |
180 | if ((err = of_device_register(&dev->ofdev)) != 0) { |
181 | printk(KERN_ERR "%s: failed to register device (%d).\n", | |
182 | __FUNCTION__, err); | |
6bccf755 | 183 | return -ENODEV; |
d7a30103 | 184 | } |
a8308800 | 185 | |
6bccf755 | 186 | return 0; |
d7a30103 HS |
187 | } |
188 | ||
189 | static struct ibmebus_dev* __devinit ibmebus_register_device_node( | |
190 | struct device_node *dn) | |
191 | { | |
192 | struct ibmebus_dev *dev; | |
a7f67bdf | 193 | const char *loc_code; |
d7a30103 HS |
194 | int length; |
195 | ||
e2eb6392 | 196 | loc_code = of_get_property(dn, "ibm,loc-code", NULL); |
d7a30103 HS |
197 | if (!loc_code) { |
198 | printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n", | |
199 | __FUNCTION__, dn->name ? dn->name : "<unknown>"); | |
6bccf755 | 200 | return ERR_PTR(-EINVAL); |
d7a30103 | 201 | } |
a8308800 | 202 | |
d7a30103 HS |
203 | if (strlen(loc_code) == 0) { |
204 | printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n", | |
205 | __FUNCTION__); | |
6bccf755 | 206 | return ERR_PTR(-EINVAL); |
d7a30103 HS |
207 | } |
208 | ||
f8485350 | 209 | dev = kzalloc(sizeof(struct ibmebus_dev), GFP_KERNEL); |
d7a30103 | 210 | if (!dev) { |
6bccf755 | 211 | return ERR_PTR(-ENOMEM); |
d7a30103 | 212 | } |
d7a30103 HS |
213 | |
214 | dev->ofdev.node = of_node_get(dn); | |
a8308800 | 215 | |
d7a30103 | 216 | length = strlen(loc_code); |
a8308800 JF |
217 | memcpy(dev->ofdev.dev.bus_id, loc_code |
218 | + (length - min(length, BUS_ID_SIZE - 1)), | |
d7a30103 HS |
219 | min(length, BUS_ID_SIZE - 1)); |
220 | ||
221 | /* Register with generic device framework. */ | |
6bccf755 | 222 | if (ibmebus_register_device_common(dev, dn->name) != 0) { |
d7a30103 | 223 | kfree(dev); |
6bccf755 | 224 | return ERR_PTR(-ENODEV); |
d7a30103 HS |
225 | } |
226 | ||
227 | return dev; | |
228 | } | |
229 | ||
230 | static void ibmebus_probe_of_nodes(char* name) | |
231 | { | |
232 | struct device_node *dn = NULL; | |
a8308800 | 233 | |
d7a30103 | 234 | while ((dn = of_find_node_by_name(dn, name))) { |
6bccf755 | 235 | if (IS_ERR(ibmebus_register_device_node(dn))) { |
d7a30103 | 236 | of_node_put(dn); |
d7a30103 HS |
237 | return; |
238 | } | |
239 | } | |
a8308800 | 240 | |
d7a30103 | 241 | of_node_put(dn); |
a8308800 | 242 | |
d7a30103 HS |
243 | return; |
244 | } | |
245 | ||
246 | static void ibmebus_add_devices_by_id(struct of_device_id *idt) | |
247 | { | |
248 | while (strlen(idt->name) > 0) { | |
249 | ibmebus_probe_of_nodes(idt->name); | |
250 | idt++; | |
251 | } | |
252 | ||
253 | return; | |
254 | } | |
255 | ||
6bccf755 | 256 | static int ibmebus_match_helper_name(struct device *dev, void *data) |
d7a30103 | 257 | { |
6bccf755 | 258 | const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev); |
e2eb6392 | 259 | const char *name; |
6bccf755 | 260 | |
e2eb6392 | 261 | name = of_get_property(ebus_dev->ofdev.node, "name", NULL); |
6bccf755 | 262 | |
e2eb6392 | 263 | if (name && (strcmp(data, name) == 0)) |
d7a30103 | 264 | return 1; |
a8308800 | 265 | |
d7a30103 HS |
266 | return 0; |
267 | } | |
268 | ||
269 | static int ibmebus_unregister_device(struct device *dev) | |
270 | { | |
d7a30103 HS |
271 | of_device_unregister(to_of_device(dev)); |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static void ibmebus_remove_devices_by_id(struct of_device_id *idt) | |
277 | { | |
278 | struct device *dev; | |
a8308800 | 279 | |
d7a30103 | 280 | while (strlen(idt->name) > 0) { |
a8308800 | 281 | while ((dev = bus_find_device(&ibmebus_bus_type, NULL, |
d7a30103 | 282 | (void*)idt->name, |
6bccf755 | 283 | ibmebus_match_helper_name))) { |
d7a30103 HS |
284 | ibmebus_unregister_device(dev); |
285 | } | |
286 | idt++; | |
d7a30103 | 287 | } |
a8308800 | 288 | |
d7a30103 HS |
289 | return; |
290 | } | |
291 | ||
292 | int ibmebus_register_driver(struct ibmebus_driver *drv) | |
293 | { | |
294 | int err = 0; | |
295 | ||
296 | drv->driver.name = drv->name; | |
297 | drv->driver.bus = &ibmebus_bus_type; | |
298 | drv->driver.probe = ibmebus_bus_probe; | |
299 | drv->driver.remove = ibmebus_bus_remove; | |
300 | ||
301 | if ((err = driver_register(&drv->driver) != 0)) | |
302 | return err; | |
303 | ||
6bccf755 JF |
304 | /* remove all supported devices first, in case someone |
305 | * probed them manually before registering the driver */ | |
306 | ibmebus_remove_devices_by_id(drv->id_table); | |
d7a30103 | 307 | ibmebus_add_devices_by_id(drv->id_table); |
a8308800 | 308 | |
d7a30103 HS |
309 | return 0; |
310 | } | |
311 | EXPORT_SYMBOL(ibmebus_register_driver); | |
312 | ||
313 | void ibmebus_unregister_driver(struct ibmebus_driver *drv) | |
a8308800 | 314 | { |
d7a30103 HS |
315 | driver_unregister(&drv->driver); |
316 | ibmebus_remove_devices_by_id(drv->id_table); | |
317 | } | |
318 | EXPORT_SYMBOL(ibmebus_unregister_driver); | |
319 | ||
320 | int ibmebus_request_irq(struct ibmebus_dev *dev, | |
a8308800 | 321 | u32 ist, |
40220c1a | 322 | irq_handler_t handler, |
d7a30103 HS |
323 | unsigned long irq_flags, const char * devname, |
324 | void *dev_id) | |
325 | { | |
6e99e458 | 326 | unsigned int irq = irq_create_mapping(NULL, ist); |
a8308800 | 327 | |
d7a30103 HS |
328 | if (irq == NO_IRQ) |
329 | return -EINVAL; | |
a8308800 | 330 | |
d7a30103 HS |
331 | return request_irq(irq, handler, |
332 | irq_flags, devname, dev_id); | |
333 | } | |
334 | EXPORT_SYMBOL(ibmebus_request_irq); | |
335 | ||
336 | void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id) | |
337 | { | |
0ebfff14 | 338 | unsigned int irq = irq_find_mapping(NULL, ist); |
a8308800 | 339 | |
d7a30103 | 340 | free_irq(irq, dev_id); |
d7a30103 HS |
341 | } |
342 | EXPORT_SYMBOL(ibmebus_free_irq); | |
343 | ||
344 | static int ibmebus_bus_match(struct device *dev, struct device_driver *drv) | |
a8308800 | 345 | { |
d7a30103 HS |
346 | const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev); |
347 | struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv); | |
348 | const struct of_device_id *ids = ebus_drv->id_table; | |
349 | const struct of_device_id *found_id; | |
a8308800 | 350 | |
d7a30103 HS |
351 | if (!ids) |
352 | return 0; | |
a8308800 | 353 | |
d7a30103 HS |
354 | found_id = of_match_device(ids, &ebus_dev->ofdev); |
355 | if (found_id) | |
356 | return 1; | |
a8308800 | 357 | |
d7a30103 HS |
358 | return 0; |
359 | } | |
360 | ||
6bccf755 JF |
361 | static ssize_t name_show(struct device *dev, |
362 | struct device_attribute *attr, char *buf) | |
363 | { | |
364 | struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev); | |
e2eb6392 | 365 | const char *name = of_get_property(ebus_dev->ofdev.node, "name", NULL); |
6bccf755 JF |
366 | return sprintf(buf, "%s\n", name); |
367 | } | |
368 | ||
369 | static struct device_attribute ibmebus_dev_attrs[] = { | |
370 | __ATTR_RO(name), | |
371 | __ATTR_NULL | |
372 | }; | |
373 | ||
374 | static int ibmebus_match_helper_loc_code(struct device *dev, void *data) | |
375 | { | |
376 | const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev); | |
e2eb6392 | 377 | const char *loc_code; |
6bccf755 | 378 | |
e2eb6392 | 379 | loc_code = of_get_property(ebus_dev->ofdev.node, "ibm,loc-code", NULL); |
6bccf755 | 380 | |
e2eb6392 | 381 | if (loc_code && (strcmp(data, loc_code) == 0)) |
6bccf755 JF |
382 | return 1; |
383 | ||
384 | return 0; | |
385 | } | |
386 | ||
387 | static ssize_t ibmebus_store_probe(struct bus_type *bus, | |
388 | const char *buf, size_t count) | |
389 | { | |
390 | struct device_node *dn = NULL; | |
391 | struct ibmebus_dev *dev; | |
e2eb6392 | 392 | const char *loc_code; |
6bccf755 JF |
393 | char parm[MAX_LOC_CODE_LENGTH]; |
394 | ||
395 | if (count >= MAX_LOC_CODE_LENGTH) | |
396 | return -EINVAL; | |
397 | memcpy(parm, buf, count); | |
398 | parm[count] = '\0'; | |
399 | if (parm[count-1] == '\n') | |
400 | parm[count-1] = '\0'; | |
401 | ||
402 | if (bus_find_device(&ibmebus_bus_type, NULL, parm, | |
403 | ibmebus_match_helper_loc_code)) { | |
404 | printk(KERN_WARNING "%s: loc_code %s has already been probed\n", | |
405 | __FUNCTION__, parm); | |
406 | return -EINVAL; | |
407 | } | |
408 | ||
409 | while ((dn = of_find_all_nodes(dn))) { | |
e2eb6392 | 410 | loc_code = of_get_property(dn, "ibm,loc-code", NULL); |
6bccf755 JF |
411 | if (loc_code && (strncmp(loc_code, parm, count) == 0)) { |
412 | dev = ibmebus_register_device_node(dn); | |
413 | if (IS_ERR(dev)) { | |
414 | of_node_put(dn); | |
415 | return PTR_ERR(dev); | |
416 | } else | |
417 | return count; /* success */ | |
418 | } | |
419 | } | |
420 | ||
421 | /* if we drop out of the loop, the loc code was invalid */ | |
422 | printk(KERN_WARNING "%s: no device with loc_code %s found\n", | |
423 | __FUNCTION__, parm); | |
424 | return -ENODEV; | |
425 | } | |
426 | ||
427 | static ssize_t ibmebus_store_remove(struct bus_type *bus, | |
428 | const char *buf, size_t count) | |
429 | { | |
430 | struct device *dev; | |
431 | char parm[MAX_LOC_CODE_LENGTH]; | |
432 | ||
433 | if (count >= MAX_LOC_CODE_LENGTH) | |
434 | return -EINVAL; | |
435 | memcpy(parm, buf, count); | |
436 | parm[count] = '\0'; | |
437 | if (parm[count-1] == '\n') | |
438 | parm[count-1] = '\0'; | |
439 | ||
440 | /* The location code is unique, so we will find one device at most */ | |
441 | if ((dev = bus_find_device(&ibmebus_bus_type, NULL, parm, | |
442 | ibmebus_match_helper_loc_code))) { | |
443 | ibmebus_unregister_device(dev); | |
444 | } else { | |
445 | printk(KERN_WARNING "%s: loc_code %s not on the bus\n", | |
446 | __FUNCTION__, parm); | |
447 | return -ENODEV; | |
448 | } | |
449 | ||
450 | return count; | |
451 | } | |
452 | ||
453 | static struct bus_attribute ibmebus_bus_attrs[] = { | |
454 | __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe), | |
455 | __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove), | |
456 | __ATTR_NULL | |
457 | }; | |
458 | ||
d7a30103 | 459 | struct bus_type ibmebus_bus_type = { |
6bccf755 JF |
460 | .name = "ibmebus", |
461 | .match = ibmebus_bus_match, | |
462 | .dev_attrs = ibmebus_dev_attrs, | |
463 | .bus_attrs = ibmebus_bus_attrs | |
d7a30103 HS |
464 | }; |
465 | EXPORT_SYMBOL(ibmebus_bus_type); | |
466 | ||
467 | static int __init ibmebus_bus_init(void) | |
468 | { | |
469 | int err; | |
a8308800 | 470 | |
d7a30103 | 471 | printk(KERN_INFO "IBM eBus Device Driver\n"); |
a8308800 | 472 | |
d7a30103 HS |
473 | err = bus_register(&ibmebus_bus_type); |
474 | if (err) { | |
475 | printk(KERN_ERR ":%s: failed to register IBM eBus.\n", | |
476 | __FUNCTION__); | |
477 | return err; | |
478 | } | |
a8308800 | 479 | |
6bccf755 | 480 | err = device_register(&ibmebus_bus_device); |
d7a30103 | 481 | if (err) { |
a8308800 | 482 | printk(KERN_WARNING "%s: device_register returned %i\n", |
d7a30103 HS |
483 | __FUNCTION__, err); |
484 | bus_unregister(&ibmebus_bus_type); | |
485 | ||
486 | return err; | |
487 | } | |
a8308800 | 488 | |
d7a30103 HS |
489 | return 0; |
490 | } | |
491 | __initcall(ibmebus_bus_init); |