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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> | |
283029d1 | 44 | #include <linux/of.h> |
a988c0a6 | 45 | #include <linux/of_platform.h> |
d7a30103 HS |
46 | #include <asm/ibmebus.h> |
47 | #include <asm/abs_addr.h> | |
48 | ||
6bccf755 | 49 | static struct device ibmebus_bus_device = { /* fake "parent" device */ |
aab0d375 | 50 | .init_name = "ibmebus", |
d7a30103 HS |
51 | }; |
52 | ||
6bccf755 JF |
53 | struct bus_type ibmebus_bus_type; |
54 | ||
55347cc9 | 55 | /* These devices will automatically be added to the bus during init */ |
1b17adf1 | 56 | static struct of_device_id __initdata ibmebus_matches[] = { |
55347cc9 JF |
57 | { .compatible = "IBM,lhca" }, |
58 | { .compatible = "IBM,lhea" }, | |
59 | {}, | |
60 | }; | |
61 | ||
d7a30103 HS |
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; | |
a8308800 | 68 | |
d7a30103 HS |
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, | |
a8308800 | 76 | size_t size, void *vaddr, |
d7a30103 HS |
77 | dma_addr_t dma_handle) |
78 | { | |
79 | kfree(vaddr); | |
80 | } | |
81 | ||
f9226d57 MN |
82 | static dma_addr_t ibmebus_map_page(struct device *dev, |
83 | struct page *page, | |
84 | unsigned long offset, | |
85 | size_t size, | |
86 | enum dma_data_direction direction, | |
87 | struct dma_attrs *attrs) | |
d7a30103 | 88 | { |
f9226d57 | 89 | return (dma_addr_t)(page_address(page) + offset); |
d7a30103 HS |
90 | } |
91 | ||
f9226d57 MN |
92 | static void ibmebus_unmap_page(struct device *dev, |
93 | dma_addr_t dma_addr, | |
94 | size_t size, | |
95 | enum dma_data_direction direction, | |
96 | struct dma_attrs *attrs) | |
d7a30103 HS |
97 | { |
98 | return; | |
99 | } | |
100 | ||
101 | static int ibmebus_map_sg(struct device *dev, | |
78bdc310 | 102 | struct scatterlist *sgl, |
3affedc4 MN |
103 | int nents, enum dma_data_direction direction, |
104 | struct dma_attrs *attrs) | |
d7a30103 | 105 | { |
78bdc310 | 106 | struct scatterlist *sg; |
d7a30103 | 107 | int i; |
a8308800 | 108 | |
78bdc310 | 109 | for_each_sg(sgl, sg, nents, i) { |
58b053e4 | 110 | sg->dma_address = (dma_addr_t) sg_virt(sg); |
78bdc310 | 111 | sg->dma_length = sg->length; |
d7a30103 | 112 | } |
a8308800 | 113 | |
d7a30103 HS |
114 | return nents; |
115 | } | |
116 | ||
117 | static void ibmebus_unmap_sg(struct device *dev, | |
118 | struct scatterlist *sg, | |
3affedc4 MN |
119 | int nents, enum dma_data_direction direction, |
120 | struct dma_attrs *attrs) | |
d7a30103 HS |
121 | { |
122 | return; | |
123 | } | |
124 | ||
125 | static int ibmebus_dma_supported(struct device *dev, u64 mask) | |
126 | { | |
127 | return 1; | |
128 | } | |
129 | ||
45223c54 | 130 | static struct dma_map_ops ibmebus_dma_ops = { |
d7a30103 HS |
131 | .alloc_coherent = ibmebus_alloc_coherent, |
132 | .free_coherent = ibmebus_free_coherent, | |
d7a30103 HS |
133 | .map_sg = ibmebus_map_sg, |
134 | .unmap_sg = ibmebus_unmap_sg, | |
135 | .dma_supported = ibmebus_dma_supported, | |
f9226d57 MN |
136 | .map_page = ibmebus_map_page, |
137 | .unmap_page = ibmebus_unmap_page, | |
d7a30103 HS |
138 | }; |
139 | ||
55347cc9 JF |
140 | static int ibmebus_match_path(struct device *dev, void *data) |
141 | { | |
142 | struct device_node *dn = to_of_device(dev)->node; | |
143 | return (dn->full_name && | |
144 | (strcasecmp((char *)data, dn->full_name) == 0)); | |
145 | } | |
146 | ||
147 | static int ibmebus_match_node(struct device *dev, void *data) | |
148 | { | |
149 | return to_of_device(dev)->node == data; | |
150 | } | |
151 | ||
152 | static int ibmebus_create_device(struct device_node *dn) | |
153 | { | |
154 | struct of_device *dev; | |
155 | int ret; | |
156 | ||
157 | dev = of_device_alloc(dn, NULL, &ibmebus_bus_device); | |
158 | if (!dev) | |
159 | return -ENOMEM; | |
160 | ||
161 | dev->dev.bus = &ibmebus_bus_type; | |
162 | dev->dev.archdata.dma_ops = &ibmebus_dma_ops; | |
163 | ||
164 | ret = of_device_register(dev); | |
165 | if (ret) { | |
166 | of_device_free(dev); | |
167 | return ret; | |
168 | } | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static int ibmebus_create_devices(const struct of_device_id *matches) | |
174 | { | |
175 | struct device_node *root, *child; | |
176 | int ret = 0; | |
177 | ||
178 | root = of_find_node_by_path("/"); | |
179 | ||
85e99b9f | 180 | for_each_child_of_node(root, child) { |
55347cc9 JF |
181 | if (!of_match_node(matches, child)) |
182 | continue; | |
183 | ||
184 | if (bus_find_device(&ibmebus_bus_type, NULL, child, | |
185 | ibmebus_match_node)) | |
186 | continue; | |
187 | ||
188 | ret = ibmebus_create_device(child); | |
189 | if (ret) { | |
190 | printk(KERN_ERR "%s: failed to create device (%i)", | |
e48b1b45 | 191 | __func__, ret); |
55347cc9 JF |
192 | of_node_put(child); |
193 | break; | |
194 | } | |
195 | } | |
196 | ||
197 | of_node_put(root); | |
198 | return ret; | |
199 | } | |
200 | ||
6b08f3ae | 201 | int ibmebus_register_driver(struct of_platform_driver *drv) |
d7a30103 | 202 | { |
6b08f3ae JF |
203 | /* If the driver uses devices that ibmebus doesn't know, add them */ |
204 | ibmebus_create_devices(drv->match_table); | |
205 | ||
745c2ef2 | 206 | return of_register_driver(drv, &ibmebus_bus_type); |
d7a30103 HS |
207 | } |
208 | EXPORT_SYMBOL(ibmebus_register_driver); | |
209 | ||
6b08f3ae | 210 | void ibmebus_unregister_driver(struct of_platform_driver *drv) |
a8308800 | 211 | { |
745c2ef2 | 212 | of_unregister_driver(drv); |
d7a30103 HS |
213 | } |
214 | EXPORT_SYMBOL(ibmebus_unregister_driver); | |
215 | ||
6b08f3ae JF |
216 | int ibmebus_request_irq(u32 ist, irq_handler_t handler, |
217 | unsigned long irq_flags, const char *devname, | |
d7a30103 HS |
218 | void *dev_id) |
219 | { | |
6e99e458 | 220 | unsigned int irq = irq_create_mapping(NULL, ist); |
a8308800 | 221 | |
d7a30103 HS |
222 | if (irq == NO_IRQ) |
223 | return -EINVAL; | |
a8308800 | 224 | |
6b08f3ae | 225 | return request_irq(irq, handler, irq_flags, devname, dev_id); |
d7a30103 HS |
226 | } |
227 | EXPORT_SYMBOL(ibmebus_request_irq); | |
228 | ||
6b08f3ae | 229 | void ibmebus_free_irq(u32 ist, void *dev_id) |
d7a30103 | 230 | { |
0ebfff14 | 231 | unsigned int irq = irq_find_mapping(NULL, ist); |
a8308800 | 232 | |
d7a30103 | 233 | free_irq(irq, dev_id); |
6358d6cb | 234 | irq_dispose_mapping(irq); |
d7a30103 HS |
235 | } |
236 | EXPORT_SYMBOL(ibmebus_free_irq); | |
237 | ||
0727702a JF |
238 | static char *ibmebus_chomp(const char *in, size_t count) |
239 | { | |
61a564fd JJ |
240 | char *out = kmalloc(count + 1, GFP_KERNEL); |
241 | ||
0727702a JF |
242 | if (!out) |
243 | return NULL; | |
244 | ||
245 | memcpy(out, in, count); | |
246 | out[count] = '\0'; | |
247 | if (out[count - 1] == '\n') | |
248 | out[count - 1] = '\0'; | |
249 | ||
250 | return out; | |
6bccf755 JF |
251 | } |
252 | ||
253 | static ssize_t ibmebus_store_probe(struct bus_type *bus, | |
254 | const char *buf, size_t count) | |
255 | { | |
256 | struct device_node *dn = NULL; | |
0727702a | 257 | char *path; |
55347cc9 | 258 | ssize_t rc = 0; |
0727702a JF |
259 | |
260 | path = ibmebus_chomp(buf, count); | |
261 | if (!path) | |
262 | return -ENOMEM; | |
263 | ||
264 | if (bus_find_device(&ibmebus_bus_type, NULL, path, | |
74c9b99d | 265 | ibmebus_match_path)) { |
0727702a | 266 | printk(KERN_WARNING "%s: %s has already been probed\n", |
e48b1b45 | 267 | __func__, path); |
74c9b99d | 268 | rc = -EEXIST; |
0727702a | 269 | goto out; |
6bccf755 JF |
270 | } |
271 | ||
0727702a | 272 | if ((dn = of_find_node_by_path(path))) { |
55347cc9 | 273 | rc = ibmebus_create_device(dn); |
0727702a | 274 | of_node_put(dn); |
0727702a JF |
275 | } else { |
276 | printk(KERN_WARNING "%s: no such device node: %s\n", | |
e48b1b45 | 277 | __func__, path); |
0727702a | 278 | rc = -ENODEV; |
6bccf755 JF |
279 | } |
280 | ||
0727702a JF |
281 | out: |
282 | kfree(path); | |
55347cc9 JF |
283 | if (rc) |
284 | return rc; | |
285 | return count; | |
6bccf755 JF |
286 | } |
287 | ||
288 | static ssize_t ibmebus_store_remove(struct bus_type *bus, | |
289 | const char *buf, size_t count) | |
290 | { | |
291 | struct device *dev; | |
0727702a | 292 | char *path; |
6bccf755 | 293 | |
0727702a JF |
294 | path = ibmebus_chomp(buf, count); |
295 | if (!path) | |
296 | return -ENOMEM; | |
297 | ||
298 | if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, | |
299 | ibmebus_match_path))) { | |
55347cc9 | 300 | of_device_unregister(to_of_device(dev)); |
0727702a JF |
301 | |
302 | kfree(path); | |
303 | return count; | |
6bccf755 | 304 | } else { |
0727702a | 305 | printk(KERN_WARNING "%s: %s not on the bus\n", |
e48b1b45 | 306 | __func__, path); |
0727702a JF |
307 | |
308 | kfree(path); | |
6bccf755 JF |
309 | return -ENODEV; |
310 | } | |
6bccf755 JF |
311 | } |
312 | ||
313 | static struct bus_attribute ibmebus_bus_attrs[] = { | |
314 | __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe), | |
315 | __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove), | |
316 | __ATTR_NULL | |
317 | }; | |
318 | ||
d7a30103 | 319 | struct bus_type ibmebus_bus_type = { |
55347cc9 | 320 | .uevent = of_device_uevent, |
6bccf755 | 321 | .bus_attrs = ibmebus_bus_attrs |
d7a30103 HS |
322 | }; |
323 | EXPORT_SYMBOL(ibmebus_bus_type); | |
324 | ||
325 | static int __init ibmebus_bus_init(void) | |
326 | { | |
327 | int err; | |
a8308800 | 328 | |
d7a30103 | 329 | printk(KERN_INFO "IBM eBus Device Driver\n"); |
a8308800 | 330 | |
a988c0a6 | 331 | err = of_bus_type_init(&ibmebus_bus_type, "ibmebus"); |
d7a30103 | 332 | if (err) { |
a988c0a6 | 333 | printk(KERN_ERR "%s: failed to register IBM eBus.\n", |
e48b1b45 | 334 | __func__); |
d7a30103 HS |
335 | return err; |
336 | } | |
a8308800 | 337 | |
6bccf755 | 338 | err = device_register(&ibmebus_bus_device); |
d7a30103 | 339 | if (err) { |
a8308800 | 340 | printk(KERN_WARNING "%s: device_register returned %i\n", |
e48b1b45 | 341 | __func__, err); |
d7a30103 HS |
342 | bus_unregister(&ibmebus_bus_type); |
343 | ||
344 | return err; | |
345 | } | |
a8308800 | 346 | |
1b17adf1 | 347 | err = ibmebus_create_devices(ibmebus_matches); |
55347cc9 JF |
348 | if (err) { |
349 | device_unregister(&ibmebus_bus_device); | |
350 | bus_unregister(&ibmebus_bus_type); | |
351 | return err; | |
352 | } | |
353 | ||
d7a30103 HS |
354 | return 0; |
355 | } | |
a988c0a6 | 356 | postcore_initcall(ibmebus_bus_init); |