powerpc/powernv: Report size of OPAL memcons log
[linux/fpc-iii.git] / arch / powerpc / platforms / pseries / ibmebus.c
blob614c2853714166e125f7206f8ad47fc0db76096f
1 /*
2 * IBM PowerPC IBM eBus Infrastructure Support.
4 * Copyright (c) 2005 IBM Corporation
5 * Joachim Fenkes <fenkes@de.ibm.com>
6 * Heiko J Schick <schickhj@de.ibm.com>
8 * All rights reserved.
10 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
11 * BSD.
13 * OpenIB BSD License
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions are met:
18 * Redistributions of source code must retain the above copyright notice, this
19 * list of conditions and the following disclaimer.
21 * Redistributions in binary form must reproduce the above copyright notice,
22 * this list of conditions and the following disclaimer in the documentation
23 * and/or other materials
24 * provided with the distribution.
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
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
33 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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
36 * POSSIBILITY OF SUCH DAMAGE.
39 #include <linux/init.h>
40 #include <linux/export.h>
41 #include <linux/console.h>
42 #include <linux/kobject.h>
43 #include <linux/dma-mapping.h>
44 #include <linux/interrupt.h>
45 #include <linux/of.h>
46 #include <linux/slab.h>
47 #include <linux/stat.h>
48 #include <linux/of_platform.h>
49 #include <asm/ibmebus.h>
51 static struct device ibmebus_bus_device = { /* fake "parent" device */
52 .init_name = "ibmebus",
55 struct bus_type ibmebus_bus_type;
57 /* These devices will automatically be added to the bus during init */
58 static const struct of_device_id ibmebus_matches[] __initconst = {
59 { .compatible = "IBM,lhca" },
60 { .compatible = "IBM,lhea" },
61 {},
64 static void *ibmebus_alloc_coherent(struct device *dev,
65 size_t size,
66 dma_addr_t *dma_handle,
67 gfp_t flag,
68 unsigned long attrs)
70 void *mem;
72 mem = kmalloc(size, flag);
73 *dma_handle = (dma_addr_t)mem;
75 return mem;
78 static void ibmebus_free_coherent(struct device *dev,
79 size_t size, void *vaddr,
80 dma_addr_t dma_handle,
81 unsigned long attrs)
83 kfree(vaddr);
86 static dma_addr_t ibmebus_map_page(struct device *dev,
87 struct page *page,
88 unsigned long offset,
89 size_t size,
90 enum dma_data_direction direction,
91 unsigned long attrs)
93 return (dma_addr_t)(page_address(page) + offset);
96 static void ibmebus_unmap_page(struct device *dev,
97 dma_addr_t dma_addr,
98 size_t size,
99 enum dma_data_direction direction,
100 unsigned long attrs)
102 return;
105 static int ibmebus_map_sg(struct device *dev,
106 struct scatterlist *sgl,
107 int nents, enum dma_data_direction direction,
108 unsigned long attrs)
110 struct scatterlist *sg;
111 int i;
113 for_each_sg(sgl, sg, nents, i) {
114 sg->dma_address = (dma_addr_t) sg_virt(sg);
115 sg->dma_length = sg->length;
118 return nents;
121 static void ibmebus_unmap_sg(struct device *dev,
122 struct scatterlist *sg,
123 int nents, enum dma_data_direction direction,
124 unsigned long attrs)
126 return;
129 static int ibmebus_dma_supported(struct device *dev, u64 mask)
131 return mask == DMA_BIT_MASK(64);
134 static u64 ibmebus_dma_get_required_mask(struct device *dev)
136 return DMA_BIT_MASK(64);
139 static struct dma_map_ops ibmebus_dma_ops = {
140 .alloc = ibmebus_alloc_coherent,
141 .free = ibmebus_free_coherent,
142 .map_sg = ibmebus_map_sg,
143 .unmap_sg = ibmebus_unmap_sg,
144 .dma_supported = ibmebus_dma_supported,
145 .get_required_mask = ibmebus_dma_get_required_mask,
146 .map_page = ibmebus_map_page,
147 .unmap_page = ibmebus_unmap_page,
150 static int ibmebus_match_path(struct device *dev, void *data)
152 struct device_node *dn = to_platform_device(dev)->dev.of_node;
153 return (dn->full_name &&
154 (strcasecmp((char *)data, dn->full_name) == 0));
157 static int ibmebus_match_node(struct device *dev, void *data)
159 return to_platform_device(dev)->dev.of_node == data;
162 static int ibmebus_create_device(struct device_node *dn)
164 struct platform_device *dev;
165 int ret;
167 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
168 if (!dev)
169 return -ENOMEM;
171 dev->dev.bus = &ibmebus_bus_type;
172 dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
174 ret = of_device_add(dev);
175 if (ret)
176 platform_device_put(dev);
177 return ret;
180 static int ibmebus_create_devices(const struct of_device_id *matches)
182 struct device_node *root, *child;
183 struct device *dev;
184 int ret = 0;
186 root = of_find_node_by_path("/");
188 for_each_child_of_node(root, child) {
189 if (!of_match_node(matches, child))
190 continue;
192 dev = bus_find_device(&ibmebus_bus_type, NULL, child,
193 ibmebus_match_node);
194 if (dev) {
195 put_device(dev);
196 continue;
199 ret = ibmebus_create_device(child);
200 if (ret) {
201 printk(KERN_ERR "%s: failed to create device (%i)",
202 __func__, ret);
203 of_node_put(child);
204 break;
208 of_node_put(root);
209 return ret;
212 int ibmebus_register_driver(struct platform_driver *drv)
214 /* If the driver uses devices that ibmebus doesn't know, add them */
215 ibmebus_create_devices(drv->driver.of_match_table);
217 drv->driver.bus = &ibmebus_bus_type;
218 return driver_register(&drv->driver);
220 EXPORT_SYMBOL(ibmebus_register_driver);
222 void ibmebus_unregister_driver(struct platform_driver *drv)
224 driver_unregister(&drv->driver);
226 EXPORT_SYMBOL(ibmebus_unregister_driver);
228 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
229 unsigned long irq_flags, const char *devname,
230 void *dev_id)
232 unsigned int irq = irq_create_mapping(NULL, ist);
234 if (!irq)
235 return -EINVAL;
237 return request_irq(irq, handler, irq_flags, devname, dev_id);
239 EXPORT_SYMBOL(ibmebus_request_irq);
241 void ibmebus_free_irq(u32 ist, void *dev_id)
243 unsigned int irq = irq_find_mapping(NULL, ist);
245 free_irq(irq, dev_id);
246 irq_dispose_mapping(irq);
248 EXPORT_SYMBOL(ibmebus_free_irq);
250 static char *ibmebus_chomp(const char *in, size_t count)
252 char *out = kmalloc(count + 1, GFP_KERNEL);
254 if (!out)
255 return NULL;
257 memcpy(out, in, count);
258 out[count] = '\0';
259 if (out[count - 1] == '\n')
260 out[count - 1] = '\0';
262 return out;
265 static ssize_t ibmebus_store_probe(struct bus_type *bus,
266 const char *buf, size_t count)
268 struct device_node *dn = NULL;
269 struct device *dev;
270 char *path;
271 ssize_t rc = 0;
273 path = ibmebus_chomp(buf, count);
274 if (!path)
275 return -ENOMEM;
277 dev = bus_find_device(&ibmebus_bus_type, NULL, path,
278 ibmebus_match_path);
279 if (dev) {
280 put_device(dev);
281 printk(KERN_WARNING "%s: %s has already been probed\n",
282 __func__, path);
283 rc = -EEXIST;
284 goto out;
287 if ((dn = of_find_node_by_path(path))) {
288 rc = ibmebus_create_device(dn);
289 of_node_put(dn);
290 } else {
291 printk(KERN_WARNING "%s: no such device node: %s\n",
292 __func__, path);
293 rc = -ENODEV;
296 out:
297 kfree(path);
298 if (rc)
299 return rc;
300 return count;
302 static BUS_ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe);
304 static ssize_t ibmebus_store_remove(struct bus_type *bus,
305 const char *buf, size_t count)
307 struct device *dev;
308 char *path;
310 path = ibmebus_chomp(buf, count);
311 if (!path)
312 return -ENOMEM;
314 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
315 ibmebus_match_path))) {
316 of_device_unregister(to_platform_device(dev));
317 put_device(dev);
319 kfree(path);
320 return count;
321 } else {
322 printk(KERN_WARNING "%s: %s not on the bus\n",
323 __func__, path);
325 kfree(path);
326 return -ENODEV;
329 static BUS_ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove);
331 static struct attribute *ibmbus_bus_attrs[] = {
332 &bus_attr_probe.attr,
333 &bus_attr_remove.attr,
334 NULL,
336 ATTRIBUTE_GROUPS(ibmbus_bus);
338 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
340 const struct of_device_id *matches = drv->of_match_table;
342 if (!matches)
343 return 0;
345 return of_match_device(matches, dev) != NULL;
348 static int ibmebus_bus_device_probe(struct device *dev)
350 int error = -ENODEV;
351 struct platform_driver *drv;
352 struct platform_device *of_dev;
354 drv = to_platform_driver(dev->driver);
355 of_dev = to_platform_device(dev);
357 if (!drv->probe)
358 return error;
360 of_dev_get(of_dev);
362 if (of_driver_match_device(dev, dev->driver))
363 error = drv->probe(of_dev);
364 if (error)
365 of_dev_put(of_dev);
367 return error;
370 static int ibmebus_bus_device_remove(struct device *dev)
372 struct platform_device *of_dev = to_platform_device(dev);
373 struct platform_driver *drv = to_platform_driver(dev->driver);
375 if (dev->driver && drv->remove)
376 drv->remove(of_dev);
377 return 0;
380 static void ibmebus_bus_device_shutdown(struct device *dev)
382 struct platform_device *of_dev = to_platform_device(dev);
383 struct platform_driver *drv = to_platform_driver(dev->driver);
385 if (dev->driver && drv->shutdown)
386 drv->shutdown(of_dev);
390 * ibmebus_bus_device_attrs
392 static ssize_t devspec_show(struct device *dev,
393 struct device_attribute *attr, char *buf)
395 struct platform_device *ofdev;
397 ofdev = to_platform_device(dev);
398 return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name);
401 static ssize_t name_show(struct device *dev,
402 struct device_attribute *attr, char *buf)
404 struct platform_device *ofdev;
406 ofdev = to_platform_device(dev);
407 return sprintf(buf, "%s\n", ofdev->dev.of_node->name);
410 static ssize_t modalias_show(struct device *dev,
411 struct device_attribute *attr, char *buf)
413 ssize_t len = of_device_get_modalias(dev, buf, PAGE_SIZE - 2);
414 buf[len] = '\n';
415 buf[len+1] = 0;
416 return len+1;
419 static struct device_attribute ibmebus_bus_device_attrs[] = {
420 __ATTR_RO(devspec),
421 __ATTR_RO(name),
422 __ATTR_RO(modalias),
423 __ATTR_NULL
426 struct bus_type ibmebus_bus_type = {
427 .name = "ibmebus",
428 .uevent = of_device_uevent_modalias,
429 .bus_groups = ibmbus_bus_groups,
430 .match = ibmebus_bus_bus_match,
431 .probe = ibmebus_bus_device_probe,
432 .remove = ibmebus_bus_device_remove,
433 .shutdown = ibmebus_bus_device_shutdown,
434 .dev_attrs = ibmebus_bus_device_attrs,
436 EXPORT_SYMBOL(ibmebus_bus_type);
438 static int __init ibmebus_bus_init(void)
440 int err;
442 printk(KERN_INFO "IBM eBus Device Driver\n");
444 err = bus_register(&ibmebus_bus_type);
445 if (err) {
446 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
447 __func__);
448 return err;
451 err = device_register(&ibmebus_bus_device);
452 if (err) {
453 printk(KERN_WARNING "%s: device_register returned %i\n",
454 __func__, err);
455 bus_unregister(&ibmebus_bus_type);
457 return err;
460 err = ibmebus_create_devices(ibmebus_matches);
461 if (err) {
462 device_unregister(&ibmebus_bus_device);
463 bus_unregister(&ibmebus_bus_type);
464 return err;
467 return 0;
469 postcore_initcall(ibmebus_bus_init);