Merge branch 'for-2.6.26' of git://git.kernel.dk/linux-2.6-block
[linux-2.6] / arch / powerpc / kernel / ibmebus.c
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/console.h>
41 #include <linux/kobject.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/interrupt.h>
44 #include <linux/of.h>
45 #include <linux/of_platform.h>
46 #include <asm/ibmebus.h>
47 #include <asm/abs_addr.h>
48
49 static struct device ibmebus_bus_device = { /* fake "parent" device */
50         .bus_id = "ibmebus",
51 };
52
53 struct bus_type ibmebus_bus_type;
54
55 /* These devices will automatically be added to the bus during init */
56 static struct of_device_id __initdata builtin_matches[] = {
57         { .compatible = "IBM,lhca" },
58         { .compatible = "IBM,lhea" },
59         {},
60 };
61
62 static void *ibmebus_alloc_coherent(struct device *dev,
63                                     size_t size,
64                                     dma_addr_t *dma_handle,
65                                     gfp_t flag)
66 {
67         void *mem;
68
69         mem = kmalloc(size, flag);
70         *dma_handle = (dma_addr_t)mem;
71
72         return mem;
73 }
74
75 static void ibmebus_free_coherent(struct device *dev,
76                                   size_t size, void *vaddr,
77                                   dma_addr_t dma_handle)
78 {
79         kfree(vaddr);
80 }
81
82 static dma_addr_t ibmebus_map_single(struct device *dev,
83                                      void *ptr,
84                                      size_t size,
85                                      enum dma_data_direction direction)
86 {
87         return (dma_addr_t)(ptr);
88 }
89
90 static void ibmebus_unmap_single(struct device *dev,
91                                  dma_addr_t dma_addr,
92                                  size_t size,
93                                  enum dma_data_direction direction)
94 {
95         return;
96 }
97
98 static int ibmebus_map_sg(struct device *dev,
99                           struct scatterlist *sgl,
100                           int nents, enum dma_data_direction direction)
101 {
102         struct scatterlist *sg;
103         int i;
104
105         for_each_sg(sgl, sg, nents, i) {
106                 sg->dma_address = (dma_addr_t) sg_virt(sg);
107                 sg->dma_length = sg->length;
108         }
109
110         return nents;
111 }
112
113 static void ibmebus_unmap_sg(struct device *dev,
114                              struct scatterlist *sg,
115                              int nents, enum dma_data_direction direction)
116 {
117         return;
118 }
119
120 static int ibmebus_dma_supported(struct device *dev, u64 mask)
121 {
122         return 1;
123 }
124
125 static struct dma_mapping_ops ibmebus_dma_ops = {
126         .alloc_coherent = ibmebus_alloc_coherent,
127         .free_coherent  = ibmebus_free_coherent,
128         .map_single     = ibmebus_map_single,
129         .unmap_single   = ibmebus_unmap_single,
130         .map_sg         = ibmebus_map_sg,
131         .unmap_sg       = ibmebus_unmap_sg,
132         .dma_supported  = ibmebus_dma_supported,
133 };
134
135 static int ibmebus_match_path(struct device *dev, void *data)
136 {
137         struct device_node *dn = to_of_device(dev)->node;
138         return (dn->full_name &&
139                 (strcasecmp((char *)data, dn->full_name) == 0));
140 }
141
142 static int ibmebus_match_node(struct device *dev, void *data)
143 {
144         return to_of_device(dev)->node == data;
145 }
146
147 static int ibmebus_create_device(struct device_node *dn)
148 {
149         struct of_device *dev;
150         int ret;
151
152         dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
153         if (!dev)
154                 return -ENOMEM;
155
156         dev->dev.bus = &ibmebus_bus_type;
157         dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
158
159         ret = of_device_register(dev);
160         if (ret) {
161                 of_device_free(dev);
162                 return ret;
163         }
164
165         return 0;
166 }
167
168 static int ibmebus_create_devices(const struct of_device_id *matches)
169 {
170         struct device_node *root, *child;
171         int ret = 0;
172
173         root = of_find_node_by_path("/");
174
175         for_each_child_of_node(root, child) {
176                 if (!of_match_node(matches, child))
177                         continue;
178
179                 if (bus_find_device(&ibmebus_bus_type, NULL, child,
180                                     ibmebus_match_node))
181                         continue;
182
183                 ret = ibmebus_create_device(child);
184                 if (ret) {
185                         printk(KERN_ERR "%s: failed to create device (%i)",
186                                __func__, ret);
187                         of_node_put(child);
188                         break;
189                 }
190         }
191
192         of_node_put(root);
193         return ret;
194 }
195
196 int ibmebus_register_driver(struct of_platform_driver *drv)
197 {
198         /* If the driver uses devices that ibmebus doesn't know, add them */
199         ibmebus_create_devices(drv->match_table);
200
201         return of_register_driver(drv, &ibmebus_bus_type);
202 }
203 EXPORT_SYMBOL(ibmebus_register_driver);
204
205 void ibmebus_unregister_driver(struct of_platform_driver *drv)
206 {
207         of_unregister_driver(drv);
208 }
209 EXPORT_SYMBOL(ibmebus_unregister_driver);
210
211 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
212                         unsigned long irq_flags, const char *devname,
213                         void *dev_id)
214 {
215         unsigned int irq = irq_create_mapping(NULL, ist);
216
217         if (irq == NO_IRQ)
218                 return -EINVAL;
219
220         return request_irq(irq, handler, irq_flags, devname, dev_id);
221 }
222 EXPORT_SYMBOL(ibmebus_request_irq);
223
224 void ibmebus_free_irq(u32 ist, void *dev_id)
225 {
226         unsigned int irq = irq_find_mapping(NULL, ist);
227
228         free_irq(irq, dev_id);
229 }
230 EXPORT_SYMBOL(ibmebus_free_irq);
231
232 static ssize_t name_show(struct device *dev,
233                          struct device_attribute *attr, char *buf)
234 {
235         return sprintf(buf, "%s\n", to_of_device(dev)->node->name);
236 }
237
238 static struct device_attribute ibmebus_dev_attrs[] = {
239         __ATTR_RO(name),
240         __ATTR_NULL
241 };
242
243 static char *ibmebus_chomp(const char *in, size_t count)
244 {
245         char *out = kmalloc(count + 1, GFP_KERNEL);
246
247         if (!out)
248                 return NULL;
249
250         memcpy(out, in, count);
251         out[count] = '\0';
252         if (out[count - 1] == '\n')
253                 out[count - 1] = '\0';
254
255         return out;
256 }
257
258 static ssize_t ibmebus_store_probe(struct bus_type *bus,
259                                    const char *buf, size_t count)
260 {
261         struct device_node *dn = NULL;
262         char *path;
263         ssize_t rc = 0;
264
265         path = ibmebus_chomp(buf, count);
266         if (!path)
267                 return -ENOMEM;
268
269         if (bus_find_device(&ibmebus_bus_type, NULL, path,
270                             ibmebus_match_path)) {
271                 printk(KERN_WARNING "%s: %s has already been probed\n",
272                        __func__, path);
273                 rc = -EEXIST;
274                 goto out;
275         }
276
277         if ((dn = of_find_node_by_path(path))) {
278                 rc = ibmebus_create_device(dn);
279                 of_node_put(dn);
280         } else {
281                 printk(KERN_WARNING "%s: no such device node: %s\n",
282                        __func__, path);
283                 rc = -ENODEV;
284         }
285
286 out:
287         kfree(path);
288         if (rc)
289                 return rc;
290         return count;
291 }
292
293 static ssize_t ibmebus_store_remove(struct bus_type *bus,
294                                     const char *buf, size_t count)
295 {
296         struct device *dev;
297         char *path;
298
299         path = ibmebus_chomp(buf, count);
300         if (!path)
301                 return -ENOMEM;
302
303         if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
304                                    ibmebus_match_path))) {
305                 of_device_unregister(to_of_device(dev));
306
307                 kfree(path);
308                 return count;
309         } else {
310                 printk(KERN_WARNING "%s: %s not on the bus\n",
311                        __func__, path);
312
313                 kfree(path);
314                 return -ENODEV;
315         }
316 }
317
318 static struct bus_attribute ibmebus_bus_attrs[] = {
319         __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
320         __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
321         __ATTR_NULL
322 };
323
324 struct bus_type ibmebus_bus_type = {
325         .uevent    = of_device_uevent,
326         .dev_attrs = ibmebus_dev_attrs,
327         .bus_attrs = ibmebus_bus_attrs
328 };
329 EXPORT_SYMBOL(ibmebus_bus_type);
330
331 static int __init ibmebus_bus_init(void)
332 {
333         int err;
334
335         printk(KERN_INFO "IBM eBus Device Driver\n");
336
337         err = of_bus_type_init(&ibmebus_bus_type, "ibmebus");
338         if (err) {
339                 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
340                        __func__);
341                 return err;
342         }
343
344         err = device_register(&ibmebus_bus_device);
345         if (err) {
346                 printk(KERN_WARNING "%s: device_register returned %i\n",
347                        __func__, err);
348                 bus_unregister(&ibmebus_bus_type);
349
350                 return err;
351         }
352
353         err = ibmebus_create_devices(builtin_matches);
354         if (err) {
355                 device_unregister(&ibmebus_bus_device);
356                 bus_unregister(&ibmebus_bus_type);
357                 return err;
358         }
359
360         return 0;
361 }
362 postcore_initcall(ibmebus_bus_init);