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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> |
5a0e3ad6 | 45 | #include <linux/slab.h> |
a988c0a6 | 46 | #include <linux/of_platform.h> |
d7a30103 HS |
47 | #include <asm/ibmebus.h> |
48 | #include <asm/abs_addr.h> | |
49 | ||
6bccf755 | 50 | static struct device ibmebus_bus_device = { /* fake "parent" device */ |
aab0d375 | 51 | .init_name = "ibmebus", |
d7a30103 HS |
52 | }; |
53 | ||
6bccf755 JF |
54 | struct bus_type ibmebus_bus_type; |
55 | ||
55347cc9 | 56 | /* These devices will automatically be added to the bus during init */ |
1b17adf1 | 57 | static struct of_device_id __initdata ibmebus_matches[] = { |
55347cc9 JF |
58 | { .compatible = "IBM,lhca" }, |
59 | { .compatible = "IBM,lhea" }, | |
60 | {}, | |
61 | }; | |
62 | ||
d7a30103 HS |
63 | static void *ibmebus_alloc_coherent(struct device *dev, |
64 | size_t size, | |
65 | dma_addr_t *dma_handle, | |
66 | gfp_t flag) | |
67 | { | |
68 | void *mem; | |
a8308800 | 69 | |
d7a30103 HS |
70 | mem = kmalloc(size, flag); |
71 | *dma_handle = (dma_addr_t)mem; | |
72 | ||
73 | return mem; | |
74 | } | |
75 | ||
76 | static void ibmebus_free_coherent(struct device *dev, | |
a8308800 | 77 | size_t size, void *vaddr, |
d7a30103 HS |
78 | dma_addr_t dma_handle) |
79 | { | |
80 | kfree(vaddr); | |
81 | } | |
82 | ||
f9226d57 MN |
83 | static dma_addr_t ibmebus_map_page(struct device *dev, |
84 | struct page *page, | |
85 | unsigned long offset, | |
86 | size_t size, | |
87 | enum dma_data_direction direction, | |
88 | struct dma_attrs *attrs) | |
d7a30103 | 89 | { |
f9226d57 | 90 | return (dma_addr_t)(page_address(page) + offset); |
d7a30103 HS |
91 | } |
92 | ||
f9226d57 MN |
93 | static void ibmebus_unmap_page(struct device *dev, |
94 | dma_addr_t dma_addr, | |
95 | size_t size, | |
96 | enum dma_data_direction direction, | |
97 | struct dma_attrs *attrs) | |
d7a30103 HS |
98 | { |
99 | return; | |
100 | } | |
101 | ||
102 | static int ibmebus_map_sg(struct device *dev, | |
78bdc310 | 103 | struct scatterlist *sgl, |
3affedc4 MN |
104 | int nents, enum dma_data_direction direction, |
105 | struct dma_attrs *attrs) | |
d7a30103 | 106 | { |
78bdc310 | 107 | struct scatterlist *sg; |
d7a30103 | 108 | int i; |
a8308800 | 109 | |
78bdc310 | 110 | for_each_sg(sgl, sg, nents, i) { |
58b053e4 | 111 | sg->dma_address = (dma_addr_t) sg_virt(sg); |
78bdc310 | 112 | sg->dma_length = sg->length; |
d7a30103 | 113 | } |
a8308800 | 114 | |
d7a30103 HS |
115 | return nents; |
116 | } | |
117 | ||
118 | static void ibmebus_unmap_sg(struct device *dev, | |
119 | struct scatterlist *sg, | |
3affedc4 MN |
120 | int nents, enum dma_data_direction direction, |
121 | struct dma_attrs *attrs) | |
d7a30103 HS |
122 | { |
123 | return; | |
124 | } | |
125 | ||
126 | static int ibmebus_dma_supported(struct device *dev, u64 mask) | |
127 | { | |
128 | return 1; | |
129 | } | |
130 | ||
45223c54 | 131 | static struct dma_map_ops ibmebus_dma_ops = { |
d7a30103 HS |
132 | .alloc_coherent = ibmebus_alloc_coherent, |
133 | .free_coherent = ibmebus_free_coherent, | |
d7a30103 HS |
134 | .map_sg = ibmebus_map_sg, |
135 | .unmap_sg = ibmebus_unmap_sg, | |
136 | .dma_supported = ibmebus_dma_supported, | |
f9226d57 MN |
137 | .map_page = ibmebus_map_page, |
138 | .unmap_page = ibmebus_unmap_page, | |
d7a30103 HS |
139 | }; |
140 | ||
55347cc9 JF |
141 | static int ibmebus_match_path(struct device *dev, void *data) |
142 | { | |
a454dc50 | 143 | struct device_node *dn = to_platform_device(dev)->dev.of_node; |
55347cc9 JF |
144 | return (dn->full_name && |
145 | (strcasecmp((char *)data, dn->full_name) == 0)); | |
146 | } | |
147 | ||
148 | static int ibmebus_match_node(struct device *dev, void *data) | |
149 | { | |
a454dc50 | 150 | return to_platform_device(dev)->dev.of_node == data; |
55347cc9 JF |
151 | } |
152 | ||
153 | static int ibmebus_create_device(struct device_node *dn) | |
154 | { | |
a454dc50 | 155 | struct platform_device *dev; |
55347cc9 JF |
156 | int ret; |
157 | ||
158 | dev = of_device_alloc(dn, NULL, &ibmebus_bus_device); | |
159 | if (!dev) | |
160 | return -ENOMEM; | |
161 | ||
162 | dev->dev.bus = &ibmebus_bus_type; | |
163 | dev->dev.archdata.dma_ops = &ibmebus_dma_ops; | |
164 | ||
7096d042 GL |
165 | ret = of_device_add(dev); |
166 | if (ret) | |
167 | platform_device_put(dev); | |
168 | return ret; | |
55347cc9 JF |
169 | } |
170 | ||
171 | static int ibmebus_create_devices(const struct of_device_id *matches) | |
172 | { | |
173 | struct device_node *root, *child; | |
174 | int ret = 0; | |
175 | ||
176 | root = of_find_node_by_path("/"); | |
177 | ||
85e99b9f | 178 | for_each_child_of_node(root, child) { |
55347cc9 JF |
179 | if (!of_match_node(matches, child)) |
180 | continue; | |
181 | ||
182 | if (bus_find_device(&ibmebus_bus_type, NULL, child, | |
183 | ibmebus_match_node)) | |
184 | continue; | |
185 | ||
186 | ret = ibmebus_create_device(child); | |
187 | if (ret) { | |
188 | printk(KERN_ERR "%s: failed to create device (%i)", | |
e48b1b45 | 189 | __func__, ret); |
55347cc9 JF |
190 | of_node_put(child); |
191 | break; | |
192 | } | |
193 | } | |
194 | ||
195 | of_node_put(root); | |
196 | return ret; | |
197 | } | |
198 | ||
6b08f3ae | 199 | int ibmebus_register_driver(struct of_platform_driver *drv) |
d7a30103 | 200 | { |
6b08f3ae | 201 | /* If the driver uses devices that ibmebus doesn't know, add them */ |
597b9d1e | 202 | ibmebus_create_devices(drv->driver.of_match_table); |
6b08f3ae | 203 | |
745c2ef2 | 204 | return of_register_driver(drv, &ibmebus_bus_type); |
d7a30103 HS |
205 | } |
206 | EXPORT_SYMBOL(ibmebus_register_driver); | |
207 | ||
6b08f3ae | 208 | void ibmebus_unregister_driver(struct of_platform_driver *drv) |
a8308800 | 209 | { |
745c2ef2 | 210 | of_unregister_driver(drv); |
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); |
6358d6cb | 232 | irq_dispose_mapping(irq); |
d7a30103 HS |
233 | } |
234 | EXPORT_SYMBOL(ibmebus_free_irq); | |
235 | ||
0727702a JF |
236 | static char *ibmebus_chomp(const char *in, size_t count) |
237 | { | |
61a564fd JJ |
238 | char *out = kmalloc(count + 1, GFP_KERNEL); |
239 | ||
0727702a JF |
240 | if (!out) |
241 | return NULL; | |
242 | ||
243 | memcpy(out, in, count); | |
244 | out[count] = '\0'; | |
245 | if (out[count - 1] == '\n') | |
246 | out[count - 1] = '\0'; | |
247 | ||
248 | return out; | |
6bccf755 JF |
249 | } |
250 | ||
251 | static ssize_t ibmebus_store_probe(struct bus_type *bus, | |
252 | const char *buf, size_t count) | |
253 | { | |
254 | struct device_node *dn = NULL; | |
0727702a | 255 | char *path; |
55347cc9 | 256 | ssize_t rc = 0; |
0727702a JF |
257 | |
258 | path = ibmebus_chomp(buf, count); | |
259 | if (!path) | |
260 | return -ENOMEM; | |
261 | ||
262 | if (bus_find_device(&ibmebus_bus_type, NULL, path, | |
74c9b99d | 263 | ibmebus_match_path)) { |
0727702a | 264 | printk(KERN_WARNING "%s: %s has already been probed\n", |
e48b1b45 | 265 | __func__, path); |
74c9b99d | 266 | rc = -EEXIST; |
0727702a | 267 | goto out; |
6bccf755 JF |
268 | } |
269 | ||
0727702a | 270 | if ((dn = of_find_node_by_path(path))) { |
55347cc9 | 271 | rc = ibmebus_create_device(dn); |
0727702a | 272 | of_node_put(dn); |
0727702a JF |
273 | } else { |
274 | printk(KERN_WARNING "%s: no such device node: %s\n", | |
e48b1b45 | 275 | __func__, path); |
0727702a | 276 | rc = -ENODEV; |
6bccf755 JF |
277 | } |
278 | ||
0727702a JF |
279 | out: |
280 | kfree(path); | |
55347cc9 JF |
281 | if (rc) |
282 | return rc; | |
283 | return count; | |
6bccf755 JF |
284 | } |
285 | ||
286 | static ssize_t ibmebus_store_remove(struct bus_type *bus, | |
287 | const char *buf, size_t count) | |
288 | { | |
289 | struct device *dev; | |
0727702a | 290 | char *path; |
6bccf755 | 291 | |
0727702a JF |
292 | path = ibmebus_chomp(buf, count); |
293 | if (!path) | |
294 | return -ENOMEM; | |
295 | ||
296 | if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, | |
297 | ibmebus_match_path))) { | |
a454dc50 | 298 | of_device_unregister(to_platform_device(dev)); |
0727702a JF |
299 | |
300 | kfree(path); | |
301 | return count; | |
6bccf755 | 302 | } else { |
0727702a | 303 | printk(KERN_WARNING "%s: %s not on the bus\n", |
e48b1b45 | 304 | __func__, path); |
0727702a JF |
305 | |
306 | kfree(path); | |
6bccf755 JF |
307 | return -ENODEV; |
308 | } | |
6bccf755 JF |
309 | } |
310 | ||
311 | static struct bus_attribute ibmebus_bus_attrs[] = { | |
312 | __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe), | |
313 | __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove), | |
314 | __ATTR_NULL | |
315 | }; | |
316 | ||
d7a30103 | 317 | struct bus_type ibmebus_bus_type = { |
55347cc9 | 318 | .uevent = of_device_uevent, |
6bccf755 | 319 | .bus_attrs = ibmebus_bus_attrs |
d7a30103 HS |
320 | }; |
321 | EXPORT_SYMBOL(ibmebus_bus_type); | |
322 | ||
323 | static int __init ibmebus_bus_init(void) | |
324 | { | |
325 | int err; | |
a8308800 | 326 | |
d7a30103 | 327 | printk(KERN_INFO "IBM eBus Device Driver\n"); |
a8308800 | 328 | |
a988c0a6 | 329 | err = of_bus_type_init(&ibmebus_bus_type, "ibmebus"); |
d7a30103 | 330 | if (err) { |
a988c0a6 | 331 | printk(KERN_ERR "%s: failed to register IBM eBus.\n", |
e48b1b45 | 332 | __func__); |
d7a30103 HS |
333 | return err; |
334 | } | |
a8308800 | 335 | |
6bccf755 | 336 | err = device_register(&ibmebus_bus_device); |
d7a30103 | 337 | if (err) { |
a8308800 | 338 | printk(KERN_WARNING "%s: device_register returned %i\n", |
e48b1b45 | 339 | __func__, err); |
d7a30103 HS |
340 | bus_unregister(&ibmebus_bus_type); |
341 | ||
342 | return err; | |
343 | } | |
a8308800 | 344 | |
1b17adf1 | 345 | err = ibmebus_create_devices(ibmebus_matches); |
55347cc9 JF |
346 | if (err) { |
347 | device_unregister(&ibmebus_bus_device); | |
348 | bus_unregister(&ibmebus_bus_type); | |
349 | return err; | |
350 | } | |
351 | ||
d7a30103 HS |
352 | return 0; |
353 | } | |
a988c0a6 | 354 | postcore_initcall(ibmebus_bus_init); |