1/*
2 * IBM PowerPC IBM eBus Infrastructure Support.
3 *
4 * Copyright (c) 2005 IBM Corporation
5 * Joachim Fenkes <fenkes@de.ibm.com>
6 * Heiko J Schick <schickhj@de.ibm.com>
7 *
8 * All rights reserved.
9 *
10 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
11 * BSD.
12 *
13 * OpenIB BSD License
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions are met:
17 *
18 * Redistributions of source code must retain the above copyright notice, this
19 * list of conditions and the following disclaimer.
20 *
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.
25 *
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.
37 */
38
39#include <linux/init.h>
40#include <linux/export.h>
41#include <linux/console.h>
42#include <linux/kobject.h>
43#include <linux/dma-map-ops.h>
44#include <linux/interrupt.h>
45#include <linux/irqdomain.h>
46#include <linux/of.h>
47#include <linux/slab.h>
48#include <linux/stat.h>
49#include <linux/of_platform.h>
50#include <linux/platform_device.h>
51#include <asm/ibmebus.h>
52#include <asm/machdep.h>
53
54static struct device ibmebus_bus_device = { /* fake "parent" device */
55 .init_name = "ibmebus",
56};
57
58const struct bus_type ibmebus_bus_type;
59
60/* These devices will automatically be added to the bus during init */
61static const struct of_device_id ibmebus_matches[] __initconst = {
62 { .compatible = "IBM,lhca" },
63 { .compatible = "IBM,lhea" },
64 {},
65};
66
67static void *ibmebus_alloc_coherent(struct device *dev,
68 size_t size,
69 dma_addr_t *dma_handle,
70 gfp_t flag,
71 unsigned long attrs)
72{
73 void *mem;
74
75 mem = kmalloc(size, flags: flag);
76 *dma_handle = (dma_addr_t)mem;
77
78 return mem;
79}
80
81static void ibmebus_free_coherent(struct device *dev,
82 size_t size, void *vaddr,
83 dma_addr_t dma_handle,
84 unsigned long attrs)
85{
86 kfree(objp: vaddr);
87}
88
89static dma_addr_t ibmebus_map_page(struct device *dev,
90 struct page *page,
91 unsigned long offset,
92 size_t size,
93 enum dma_data_direction direction,
94 unsigned long attrs)
95{
96 return (dma_addr_t)(page_address(page) + offset);
97}
98
99static void ibmebus_unmap_page(struct device *dev,
100 dma_addr_t dma_addr,
101 size_t size,
102 enum dma_data_direction direction,
103 unsigned long attrs)
104{
105 return;
106}
107
108static int ibmebus_map_sg(struct device *dev,
109 struct scatterlist *sgl,
110 int nents, enum dma_data_direction direction,
111 unsigned long attrs)
112{
113 struct scatterlist *sg;
114 int i;
115
116 for_each_sg(sgl, sg, nents, i) {
117 sg->dma_address = (dma_addr_t) sg_virt(sg);
118 sg->dma_length = sg->length;
119 }
120
121 return nents;
122}
123
124static void ibmebus_unmap_sg(struct device *dev,
125 struct scatterlist *sg,
126 int nents, enum dma_data_direction direction,
127 unsigned long attrs)
128{
129 return;
130}
131
132static int ibmebus_dma_supported(struct device *dev, u64 mask)
133{
134 return mask == DMA_BIT_MASK(64);
135}
136
137static u64 ibmebus_dma_get_required_mask(struct device *dev)
138{
139 return DMA_BIT_MASK(64);
140}
141
142static const struct dma_map_ops ibmebus_dma_ops = {
143 .alloc = ibmebus_alloc_coherent,
144 .free = ibmebus_free_coherent,
145 .map_sg = ibmebus_map_sg,
146 .unmap_sg = ibmebus_unmap_sg,
147 .dma_supported = ibmebus_dma_supported,
148 .get_required_mask = ibmebus_dma_get_required_mask,
149 .map_page = ibmebus_map_page,
150 .unmap_page = ibmebus_unmap_page,
151};
152
153static int ibmebus_match_path(struct device *dev, const void *data)
154{
155 struct device_node *dn = to_platform_device(dev)->dev.of_node;
156 struct device_node *tn = of_find_node_by_path(path: data);
157
158 of_node_put(node: tn);
159
160 return (tn == dn);
161}
162
163static int ibmebus_match_node(struct device *dev, const void *data)
164{
165 return to_platform_device(dev)->dev.of_node == data;
166}
167
168static int ibmebus_create_device(struct device_node *dn)
169{
170 struct platform_device *dev;
171 int ret;
172
173 dev = of_device_alloc(np: dn, NULL, parent: &ibmebus_bus_device);
174 if (!dev)
175 return -ENOMEM;
176
177 dev->dev.bus = &ibmebus_bus_type;
178 dev->dev.dma_ops = &ibmebus_dma_ops;
179
180 ret = of_device_add(pdev: dev);
181 if (ret)
182 platform_device_put(pdev: dev);
183 return ret;
184}
185
186static int ibmebus_create_devices(const struct of_device_id *matches)
187{
188 struct device_node *root, *child;
189 struct device *dev;
190 int ret = 0;
191
192 root = of_find_node_by_path(path: "/");
193
194 for_each_child_of_node(root, child) {
195 if (!of_match_node(matches, node: child))
196 continue;
197
198 dev = bus_find_device(bus: &ibmebus_bus_type, NULL, data: child,
199 match: ibmebus_match_node);
200 if (dev) {
201 put_device(dev);
202 continue;
203 }
204
205 ret = ibmebus_create_device(dn: child);
206 if (ret) {
207 printk(KERN_ERR "%s: failed to create device (%i)",
208 __func__, ret);
209 of_node_put(node: child);
210 break;
211 }
212 }
213
214 of_node_put(node: root);
215 return ret;
216}
217
218int ibmebus_register_driver(struct platform_driver *drv)
219{
220 /* If the driver uses devices that ibmebus doesn't know, add them */
221 ibmebus_create_devices(matches: drv->driver.of_match_table);
222
223 drv->driver.bus = &ibmebus_bus_type;
224 return driver_register(drv: &drv->driver);
225}
226EXPORT_SYMBOL(ibmebus_register_driver);
227
228void ibmebus_unregister_driver(struct platform_driver *drv)
229{
230 driver_unregister(drv: &drv->driver);
231}
232EXPORT_SYMBOL(ibmebus_unregister_driver);
233
234int ibmebus_request_irq(u32 ist, irq_handler_t handler,
235 unsigned long irq_flags, const char *devname,
236 void *dev_id)
237{
238 unsigned int irq = irq_create_mapping(NULL, hwirq: ist);
239
240 if (!irq)
241 return -EINVAL;
242
243 return request_irq(irq, handler, flags: irq_flags, name: devname, dev: dev_id);
244}
245EXPORT_SYMBOL(ibmebus_request_irq);
246
247void ibmebus_free_irq(u32 ist, void *dev_id)
248{
249 unsigned int irq = irq_find_mapping(NULL, hwirq: ist);
250
251 free_irq(irq, dev_id);
252 irq_dispose_mapping(virq: irq);
253}
254EXPORT_SYMBOL(ibmebus_free_irq);
255
256static char *ibmebus_chomp(const char *in, size_t count)
257{
258 char *out = kmalloc(size: count + 1, GFP_KERNEL);
259
260 if (!out)
261 return NULL;
262
263 memcpy(out, in, count);
264 out[count] = '\0';
265 if (out[count - 1] == '\n')
266 out[count - 1] = '\0';
267
268 return out;
269}
270
271static ssize_t probe_store(const struct bus_type *bus, const char *buf, size_t count)
272{
273 struct device_node *dn = NULL;
274 struct device *dev;
275 char *path;
276 ssize_t rc = 0;
277
278 path = ibmebus_chomp(in: buf, count);
279 if (!path)
280 return -ENOMEM;
281
282 dev = bus_find_device(bus: &ibmebus_bus_type, NULL, data: path,
283 match: ibmebus_match_path);
284 if (dev) {
285 put_device(dev);
286 printk(KERN_WARNING "%s: %s has already been probed\n",
287 __func__, path);
288 rc = -EEXIST;
289 goto out;
290 }
291
292 if ((dn = of_find_node_by_path(path))) {
293 rc = ibmebus_create_device(dn);
294 of_node_put(node: dn);
295 } else {
296 printk(KERN_WARNING "%s: no such device node: %s\n",
297 __func__, path);
298 rc = -ENODEV;
299 }
300
301out:
302 kfree(objp: path);
303 if (rc)
304 return rc;
305 return count;
306}
307static BUS_ATTR_WO(probe);
308
309static ssize_t remove_store(const struct bus_type *bus, const char *buf, size_t count)
310{
311 struct device *dev;
312 char *path;
313
314 path = ibmebus_chomp(in: buf, count);
315 if (!path)
316 return -ENOMEM;
317
318 if ((dev = bus_find_device(bus: &ibmebus_bus_type, NULL, data: path,
319 match: ibmebus_match_path))) {
320 of_device_unregister(to_platform_device(dev));
321 put_device(dev);
322
323 kfree(objp: path);
324 return count;
325 } else {
326 printk(KERN_WARNING "%s: %s not on the bus\n",
327 __func__, path);
328
329 kfree(objp: path);
330 return -ENODEV;
331 }
332}
333static BUS_ATTR_WO(remove);
334
335static struct attribute *ibmbus_bus_attrs[] = {
336 &bus_attr_probe.attr,
337 &bus_attr_remove.attr,
338 NULL,
339};
340ATTRIBUTE_GROUPS(ibmbus_bus);
341
342static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
343{
344 const struct of_device_id *matches = drv->of_match_table;
345
346 if (!matches)
347 return 0;
348
349 return of_match_device(matches, dev) != NULL;
350}
351
352static int ibmebus_bus_device_probe(struct device *dev)
353{
354 int error = -ENODEV;
355 struct platform_driver *drv;
356 struct platform_device *of_dev;
357
358 drv = to_platform_driver(dev->driver);
359 of_dev = to_platform_device(dev);
360
361 if (!drv->probe)
362 return error;
363
364 get_device(dev);
365
366 if (of_driver_match_device(dev, dev->driver))
367 error = drv->probe(of_dev);
368 if (error)
369 put_device(dev);
370
371 return error;
372}
373
374static void ibmebus_bus_device_remove(struct device *dev)
375{
376 struct platform_device *of_dev = to_platform_device(dev);
377 struct platform_driver *drv = to_platform_driver(dev->driver);
378
379 if (dev->driver && drv->remove)
380 drv->remove(of_dev);
381}
382
383static void ibmebus_bus_device_shutdown(struct device *dev)
384{
385 struct platform_device *of_dev = to_platform_device(dev);
386 struct platform_driver *drv = to_platform_driver(dev->driver);
387
388 if (dev->driver && drv->shutdown)
389 drv->shutdown(of_dev);
390}
391
392/*
393 * ibmebus_bus_device_attrs
394 */
395static ssize_t devspec_show(struct device *dev,
396 struct device_attribute *attr, char *buf)
397{
398 struct platform_device *ofdev;
399
400 ofdev = to_platform_device(dev);
401 return sprintf(buf, fmt: "%pOF\n", ofdev->dev.of_node);
402}
403static DEVICE_ATTR_RO(devspec);
404
405static ssize_t name_show(struct device *dev,
406 struct device_attribute *attr, char *buf)
407{
408 struct platform_device *ofdev;
409
410 ofdev = to_platform_device(dev);
411 return sprintf(buf, fmt: "%pOFn\n", ofdev->dev.of_node);
412}
413static DEVICE_ATTR_RO(name);
414
415static ssize_t modalias_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
417{
418 return of_device_modalias(dev, buf, PAGE_SIZE);
419}
420static DEVICE_ATTR_RO(modalias);
421
422static struct attribute *ibmebus_bus_device_attrs[] = {
423 &dev_attr_devspec.attr,
424 &dev_attr_name.attr,
425 &dev_attr_modalias.attr,
426 NULL,
427};
428ATTRIBUTE_GROUPS(ibmebus_bus_device);
429
430static int ibmebus_bus_modalias(const struct device *dev, struct kobj_uevent_env *env)
431{
432 return of_device_uevent_modalias(dev, env);
433}
434
435const struct bus_type ibmebus_bus_type = {
436 .name = "ibmebus",
437 .uevent = ibmebus_bus_modalias,
438 .bus_groups = ibmbus_bus_groups,
439 .match = ibmebus_bus_bus_match,
440 .probe = ibmebus_bus_device_probe,
441 .remove = ibmebus_bus_device_remove,
442 .shutdown = ibmebus_bus_device_shutdown,
443 .dev_groups = ibmebus_bus_device_groups,
444};
445EXPORT_SYMBOL(ibmebus_bus_type);
446
447static int __init ibmebus_bus_init(void)
448{
449 int err;
450
451 printk(KERN_INFO "IBM eBus Device Driver\n");
452
453 err = bus_register(bus: &ibmebus_bus_type);
454 if (err) {
455 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
456 __func__);
457 return err;
458 }
459
460 err = device_register(dev: &ibmebus_bus_device);
461 if (err) {
462 printk(KERN_WARNING "%s: device_register returned %i\n",
463 __func__, err);
464 put_device(dev: &ibmebus_bus_device);
465 bus_unregister(bus: &ibmebus_bus_type);
466
467 return err;
468 }
469
470 err = ibmebus_create_devices(matches: ibmebus_matches);
471 if (err) {
472 device_unregister(dev: &ibmebus_bus_device);
473 bus_unregister(bus: &ibmebus_bus_type);
474 return err;
475 }
476
477 return 0;
478}
479machine_postcore_initcall(pseries, ibmebus_bus_init);
480

source code of linux/arch/powerpc/platforms/pseries/ibmebus.c