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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> | |
a988c0a6 | 44 | #include <linux/of_platform.h> |
d7a30103 HS |
45 | #include <asm/ibmebus.h> |
46 | #include <asm/abs_addr.h> | |
47 | ||
6bccf755 JF |
48 | static struct device ibmebus_bus_device = { /* fake "parent" device */ |
49 | .bus_id = "ibmebus", | |
d7a30103 HS |
50 | }; |
51 | ||
6bccf755 JF |
52 | struct bus_type ibmebus_bus_type; |
53 | ||
55347cc9 JF |
54 | /* These devices will automatically be added to the bus during init */ |
55 | static struct of_device_id builtin_matches[] = { | |
56 | { .compatible = "IBM,lhca" }, | |
57 | { .compatible = "IBM,lhea" }, | |
58 | {}, | |
59 | }; | |
60 | ||
d7a30103 HS |
61 | static void *ibmebus_alloc_coherent(struct device *dev, |
62 | size_t size, | |
63 | dma_addr_t *dma_handle, | |
64 | gfp_t flag) | |
65 | { | |
66 | void *mem; | |
a8308800 | 67 | |
d7a30103 HS |
68 | mem = kmalloc(size, flag); |
69 | *dma_handle = (dma_addr_t)mem; | |
70 | ||
71 | return mem; | |
72 | } | |
73 | ||
74 | static void ibmebus_free_coherent(struct device *dev, | |
a8308800 | 75 | size_t size, void *vaddr, |
d7a30103 HS |
76 | dma_addr_t dma_handle) |
77 | { | |
78 | kfree(vaddr); | |
79 | } | |
80 | ||
81 | static dma_addr_t ibmebus_map_single(struct device *dev, | |
82 | void *ptr, | |
83 | size_t size, | |
84 | enum dma_data_direction direction) | |
85 | { | |
86 | return (dma_addr_t)(ptr); | |
87 | } | |
88 | ||
89 | static void ibmebus_unmap_single(struct device *dev, | |
90 | dma_addr_t dma_addr, | |
a8308800 | 91 | size_t size, |
d7a30103 HS |
92 | enum dma_data_direction direction) |
93 | { | |
94 | return; | |
95 | } | |
96 | ||
97 | static int ibmebus_map_sg(struct device *dev, | |
78bdc310 | 98 | struct scatterlist *sgl, |
d7a30103 HS |
99 | int nents, enum dma_data_direction direction) |
100 | { | |
78bdc310 | 101 | struct scatterlist *sg; |
d7a30103 | 102 | int i; |
a8308800 | 103 | |
78bdc310 JA |
104 | for_each_sg(sgl, sg, nents, i) { |
105 | sg->dma_address = (dma_addr_t)page_address(sg->page) | |
106 | + sg->offset; | |
107 | sg->dma_length = sg->length; | |
d7a30103 | 108 | } |
a8308800 | 109 | |
d7a30103 HS |
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 | ||
12d04eef | 125 | static struct dma_mapping_ops ibmebus_dma_ops = { |
d7a30103 HS |
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 | ||
55347cc9 JF |
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 (child = NULL; (child = of_get_next_child(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 | __FUNCTION__, ret); | |
187 | of_node_put(child); | |
188 | break; | |
189 | } | |
190 | } | |
191 | ||
192 | of_node_put(root); | |
193 | return ret; | |
194 | } | |
195 | ||
6b08f3ae | 196 | int ibmebus_register_driver(struct of_platform_driver *drv) |
d7a30103 | 197 | { |
6b08f3ae JF |
198 | /* If the driver uses devices that ibmebus doesn't know, add them */ |
199 | ibmebus_create_devices(drv->match_table); | |
200 | ||
201 | drv->driver.name = drv->name; | |
202 | drv->driver.bus = &ibmebus_bus_type; | |
203 | ||
204 | return driver_register(&drv->driver); | |
d7a30103 HS |
205 | } |
206 | EXPORT_SYMBOL(ibmebus_register_driver); | |
207 | ||
6b08f3ae | 208 | void ibmebus_unregister_driver(struct of_platform_driver *drv) |
a8308800 | 209 | { |
6b08f3ae | 210 | driver_unregister(&drv->driver); |
d7a30103 HS |
211 | } |
212 | EXPORT_SYMBOL(ibmebus_unregister_driver); | |
213 | ||
6b08f3ae JF |
214 | int ibmebus_request_irq(u32 ist, irq_handler_t handler, |
215 | unsigned long irq_flags, const char *devname, | |
d7a30103 HS |
216 | void *dev_id) |
217 | { | |
6e99e458 | 218 | unsigned int irq = irq_create_mapping(NULL, ist); |
a8308800 | 219 | |
d7a30103 HS |
220 | if (irq == NO_IRQ) |
221 | return -EINVAL; | |
a8308800 | 222 | |
6b08f3ae | 223 | return request_irq(irq, handler, irq_flags, devname, dev_id); |
d7a30103 HS |
224 | } |
225 | EXPORT_SYMBOL(ibmebus_request_irq); | |
226 | ||
6b08f3ae | 227 | void ibmebus_free_irq(u32 ist, void *dev_id) |
d7a30103 | 228 | { |
0ebfff14 | 229 | unsigned int irq = irq_find_mapping(NULL, ist); |
a8308800 | 230 | |
d7a30103 | 231 | free_irq(irq, dev_id); |
d7a30103 HS |
232 | } |
233 | EXPORT_SYMBOL(ibmebus_free_irq); | |
234 | ||
6bccf755 JF |
235 | static ssize_t name_show(struct device *dev, |
236 | struct device_attribute *attr, char *buf) | |
237 | { | |
6b08f3ae | 238 | return sprintf(buf, "%s\n", to_of_device(dev)->node->name); |
6bccf755 JF |
239 | } |
240 | ||
241 | static struct device_attribute ibmebus_dev_attrs[] = { | |
242 | __ATTR_RO(name), | |
243 | __ATTR_NULL | |
244 | }; | |
245 | ||
0727702a JF |
246 | static char *ibmebus_chomp(const char *in, size_t count) |
247 | { | |
61a564fd JJ |
248 | char *out = kmalloc(count + 1, GFP_KERNEL); |
249 | ||
0727702a JF |
250 | if (!out) |
251 | return NULL; | |
252 | ||
253 | memcpy(out, in, count); | |
254 | out[count] = '\0'; | |
255 | if (out[count - 1] == '\n') | |
256 | out[count - 1] = '\0'; | |
257 | ||
258 | return out; | |
6bccf755 JF |
259 | } |
260 | ||
261 | static ssize_t ibmebus_store_probe(struct bus_type *bus, | |
262 | const char *buf, size_t count) | |
263 | { | |
264 | struct device_node *dn = NULL; | |
0727702a | 265 | char *path; |
55347cc9 | 266 | ssize_t rc = 0; |
0727702a JF |
267 | |
268 | path = ibmebus_chomp(buf, count); | |
269 | if (!path) | |
270 | return -ENOMEM; | |
271 | ||
272 | if (bus_find_device(&ibmebus_bus_type, NULL, path, | |
74c9b99d | 273 | ibmebus_match_path)) { |
0727702a JF |
274 | printk(KERN_WARNING "%s: %s has already been probed\n", |
275 | __FUNCTION__, path); | |
74c9b99d | 276 | rc = -EEXIST; |
0727702a | 277 | goto out; |
6bccf755 JF |
278 | } |
279 | ||
0727702a | 280 | if ((dn = of_find_node_by_path(path))) { |
55347cc9 | 281 | rc = ibmebus_create_device(dn); |
0727702a | 282 | of_node_put(dn); |
0727702a JF |
283 | } else { |
284 | printk(KERN_WARNING "%s: no such device node: %s\n", | |
285 | __FUNCTION__, path); | |
286 | rc = -ENODEV; | |
6bccf755 JF |
287 | } |
288 | ||
0727702a JF |
289 | out: |
290 | kfree(path); | |
55347cc9 JF |
291 | if (rc) |
292 | return rc; | |
293 | return count; | |
6bccf755 JF |
294 | } |
295 | ||
296 | static ssize_t ibmebus_store_remove(struct bus_type *bus, | |
297 | const char *buf, size_t count) | |
298 | { | |
299 | struct device *dev; | |
0727702a | 300 | char *path; |
6bccf755 | 301 | |
0727702a JF |
302 | path = ibmebus_chomp(buf, count); |
303 | if (!path) | |
304 | return -ENOMEM; | |
305 | ||
306 | if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, | |
307 | ibmebus_match_path))) { | |
55347cc9 | 308 | of_device_unregister(to_of_device(dev)); |
0727702a JF |
309 | |
310 | kfree(path); | |
311 | return count; | |
6bccf755 | 312 | } else { |
0727702a JF |
313 | printk(KERN_WARNING "%s: %s not on the bus\n", |
314 | __FUNCTION__, path); | |
315 | ||
316 | kfree(path); | |
6bccf755 JF |
317 | return -ENODEV; |
318 | } | |
6bccf755 JF |
319 | } |
320 | ||
321 | static struct bus_attribute ibmebus_bus_attrs[] = { | |
322 | __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe), | |
323 | __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove), | |
324 | __ATTR_NULL | |
325 | }; | |
326 | ||
d7a30103 | 327 | struct bus_type ibmebus_bus_type = { |
55347cc9 | 328 | .uevent = of_device_uevent, |
6bccf755 JF |
329 | .dev_attrs = ibmebus_dev_attrs, |
330 | .bus_attrs = ibmebus_bus_attrs | |
d7a30103 HS |
331 | }; |
332 | EXPORT_SYMBOL(ibmebus_bus_type); | |
333 | ||
334 | static int __init ibmebus_bus_init(void) | |
335 | { | |
336 | int err; | |
a8308800 | 337 | |
d7a30103 | 338 | printk(KERN_INFO "IBM eBus Device Driver\n"); |
a8308800 | 339 | |
a988c0a6 | 340 | err = of_bus_type_init(&ibmebus_bus_type, "ibmebus"); |
d7a30103 | 341 | if (err) { |
a988c0a6 | 342 | printk(KERN_ERR "%s: failed to register IBM eBus.\n", |
d7a30103 HS |
343 | __FUNCTION__); |
344 | return err; | |
345 | } | |
a8308800 | 346 | |
6bccf755 | 347 | err = device_register(&ibmebus_bus_device); |
d7a30103 | 348 | if (err) { |
a8308800 | 349 | printk(KERN_WARNING "%s: device_register returned %i\n", |
d7a30103 HS |
350 | __FUNCTION__, err); |
351 | bus_unregister(&ibmebus_bus_type); | |
352 | ||
353 | return err; | |
354 | } | |
a8308800 | 355 | |
55347cc9 JF |
356 | err = ibmebus_create_devices(builtin_matches); |
357 | if (err) { | |
358 | device_unregister(&ibmebus_bus_device); | |
359 | bus_unregister(&ibmebus_bus_type); | |
360 | return err; | |
361 | } | |
362 | ||
d7a30103 HS |
363 | return 0; |
364 | } | |
a988c0a6 | 365 | postcore_initcall(ibmebus_bus_init); |