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d7a30103 HS |
1 | /* |
2 | * IBM PowerPC IBM eBus Infrastructure Support. | |
3 | * | |
4 | * Copyright (c) 2005 IBM Corporation | |
5 | * Heiko J Schick <schickhj@de.ibm.com> | |
6 | * | |
7 | * All rights reserved. | |
8 | * | |
9 | * This source code is distributed under a dual license of GPL v2.0 and OpenIB | |
10 | * BSD. | |
11 | * | |
12 | * OpenIB BSD License | |
13 | * | |
14 | * Redistribution and use in source and binary forms, with or without | |
15 | * modification, are permitted provided that the following conditions are met: | |
16 | * | |
17 | * Redistributions of source code must retain the above copyright notice, this | |
18 | * list of conditions and the following disclaimer. | |
19 | * | |
20 | * Redistributions in binary form must reproduce the above copyright notice, | |
21 | * this list of conditions and the following disclaimer in the documentation | |
22 | * and/or other materials | |
23 | * provided with the distribution. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
26 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
29 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
32 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER | |
33 | * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
34 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
35 | * POSSIBILITY OF SUCH DAMAGE. | |
36 | */ | |
37 | ||
38 | #include <linux/init.h> | |
39 | #include <linux/console.h> | |
40 | #include <linux/kobject.h> | |
41 | #include <linux/dma-mapping.h> | |
42 | #include <linux/interrupt.h> | |
43 | #include <asm/ibmebus.h> | |
44 | #include <asm/abs_addr.h> | |
45 | ||
46 | static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */ | |
47 | .name = ibmebus_bus_device.ofdev.dev.bus_id, | |
48 | .ofdev.dev.bus_id = "ibmebus", | |
49 | .ofdev.dev.bus = &ibmebus_bus_type, | |
50 | }; | |
51 | ||
52 | static void *ibmebus_alloc_coherent(struct device *dev, | |
53 | size_t size, | |
54 | dma_addr_t *dma_handle, | |
55 | gfp_t flag) | |
56 | { | |
57 | void *mem; | |
58 | ||
59 | mem = kmalloc(size, flag); | |
60 | *dma_handle = (dma_addr_t)mem; | |
61 | ||
62 | return mem; | |
63 | } | |
64 | ||
65 | static void ibmebus_free_coherent(struct device *dev, | |
66 | size_t size, void *vaddr, | |
67 | dma_addr_t dma_handle) | |
68 | { | |
69 | kfree(vaddr); | |
70 | } | |
71 | ||
72 | static dma_addr_t ibmebus_map_single(struct device *dev, | |
73 | void *ptr, | |
74 | size_t size, | |
75 | enum dma_data_direction direction) | |
76 | { | |
77 | return (dma_addr_t)(ptr); | |
78 | } | |
79 | ||
80 | static void ibmebus_unmap_single(struct device *dev, | |
81 | dma_addr_t dma_addr, | |
82 | size_t size, | |
83 | enum dma_data_direction direction) | |
84 | { | |
85 | return; | |
86 | } | |
87 | ||
88 | static int ibmebus_map_sg(struct device *dev, | |
89 | struct scatterlist *sg, | |
90 | int nents, enum dma_data_direction direction) | |
91 | { | |
92 | int i; | |
93 | ||
94 | for (i = 0; i < nents; i++) { | |
95 | sg[i].dma_address = (dma_addr_t)page_address(sg[i].page) | |
96 | + sg[i].offset; | |
97 | sg[i].dma_length = sg[i].length; | |
98 | } | |
99 | ||
100 | return nents; | |
101 | } | |
102 | ||
103 | static void ibmebus_unmap_sg(struct device *dev, | |
104 | struct scatterlist *sg, | |
105 | int nents, enum dma_data_direction direction) | |
106 | { | |
107 | return; | |
108 | } | |
109 | ||
110 | static int ibmebus_dma_supported(struct device *dev, u64 mask) | |
111 | { | |
112 | return 1; | |
113 | } | |
114 | ||
115 | struct dma_mapping_ops ibmebus_dma_ops = { | |
116 | .alloc_coherent = ibmebus_alloc_coherent, | |
117 | .free_coherent = ibmebus_free_coherent, | |
118 | .map_single = ibmebus_map_single, | |
119 | .unmap_single = ibmebus_unmap_single, | |
120 | .map_sg = ibmebus_map_sg, | |
121 | .unmap_sg = ibmebus_unmap_sg, | |
122 | .dma_supported = ibmebus_dma_supported, | |
123 | }; | |
124 | ||
125 | static int ibmebus_bus_probe(struct device *dev) | |
126 | { | |
127 | struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev); | |
128 | struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver); | |
129 | const struct of_device_id *id; | |
130 | int error = -ENODEV; | |
131 | ||
132 | if (!ibmebusdrv->probe) | |
133 | return error; | |
134 | ||
135 | id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev); | |
136 | if (id) { | |
137 | error = ibmebusdrv->probe(ibmebusdev, id); | |
138 | } | |
139 | ||
140 | return error; | |
141 | } | |
142 | ||
143 | static int ibmebus_bus_remove(struct device *dev) | |
144 | { | |
145 | struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev); | |
146 | struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver); | |
147 | ||
148 | if (ibmebusdrv->remove) { | |
149 | return ibmebusdrv->remove(ibmebusdev); | |
150 | } | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static void __devinit ibmebus_dev_release(struct device *dev) | |
156 | { | |
157 | of_node_put(to_ibmebus_dev(dev)->ofdev.node); | |
158 | kfree(to_ibmebus_dev(dev)); | |
159 | } | |
160 | ||
161 | static ssize_t ibmebusdev_show_name(struct device *dev, | |
162 | struct device_attribute *attr, char *buf) | |
163 | { | |
164 | return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name); | |
165 | } | |
166 | static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name, | |
167 | NULL); | |
168 | ||
169 | static struct ibmebus_dev* __devinit ibmebus_register_device_common( | |
170 | struct ibmebus_dev *dev, char *name) | |
171 | { | |
172 | int err = 0; | |
173 | ||
174 | dev->name = name; | |
175 | dev->ofdev.dev.parent = &ibmebus_bus_device.ofdev.dev; | |
176 | dev->ofdev.dev.bus = &ibmebus_bus_type; | |
177 | dev->ofdev.dev.release = ibmebus_dev_release; | |
178 | ||
179 | /* An ibmebusdev is based on a of_device. We have to change the | |
180 | * bus type to use our own DMA mapping operations. | |
181 | */ | |
182 | if ((err = of_device_register(&dev->ofdev)) != 0) { | |
183 | printk(KERN_ERR "%s: failed to register device (%d).\n", | |
184 | __FUNCTION__, err); | |
185 | return NULL; | |
186 | } | |
187 | ||
188 | device_create_file(&dev->ofdev.dev, &dev_attr_name); | |
189 | ||
190 | return dev; | |
191 | } | |
192 | ||
193 | static struct ibmebus_dev* __devinit ibmebus_register_device_node( | |
194 | struct device_node *dn) | |
195 | { | |
196 | struct ibmebus_dev *dev; | |
197 | char *loc_code; | |
198 | int length; | |
199 | ||
200 | loc_code = (char *)get_property(dn, "ibm,loc-code", NULL); | |
201 | if (!loc_code) { | |
202 | printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n", | |
203 | __FUNCTION__, dn->name ? dn->name : "<unknown>"); | |
204 | return NULL; | |
205 | } | |
206 | ||
207 | if (strlen(loc_code) == 0) { | |
208 | printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n", | |
209 | __FUNCTION__); | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | dev = kmalloc(sizeof(struct ibmebus_dev), GFP_KERNEL); | |
214 | if (!dev) { | |
215 | return NULL; | |
216 | } | |
217 | memset(dev, 0, sizeof(struct ibmebus_dev)); | |
218 | ||
219 | dev->ofdev.node = of_node_get(dn); | |
220 | ||
221 | length = strlen(loc_code); | |
222 | memcpy(dev->ofdev.dev.bus_id, loc_code | |
223 | + (length - min(length, BUS_ID_SIZE - 1)), | |
224 | min(length, BUS_ID_SIZE - 1)); | |
225 | ||
226 | /* Register with generic device framework. */ | |
227 | if (ibmebus_register_device_common(dev, dn->name) == NULL) { | |
228 | kfree(dev); | |
229 | return NULL; | |
230 | } | |
231 | ||
232 | return dev; | |
233 | } | |
234 | ||
235 | static void ibmebus_probe_of_nodes(char* name) | |
236 | { | |
237 | struct device_node *dn = NULL; | |
238 | ||
239 | while ((dn = of_find_node_by_name(dn, name))) { | |
240 | if (ibmebus_register_device_node(dn) == NULL) { | |
241 | of_node_put(dn); | |
242 | ||
243 | return; | |
244 | } | |
245 | } | |
246 | ||
247 | of_node_put(dn); | |
248 | ||
249 | return; | |
250 | } | |
251 | ||
252 | static void ibmebus_add_devices_by_id(struct of_device_id *idt) | |
253 | { | |
254 | while (strlen(idt->name) > 0) { | |
255 | ibmebus_probe_of_nodes(idt->name); | |
256 | idt++; | |
257 | } | |
258 | ||
259 | return; | |
260 | } | |
261 | ||
262 | static int ibmebus_match_helper(struct device *dev, void *data) | |
263 | { | |
264 | if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0) | |
265 | return 1; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static int ibmebus_unregister_device(struct device *dev) | |
271 | { | |
272 | device_remove_file(dev, &dev_attr_name); | |
273 | of_device_unregister(to_of_device(dev)); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
278 | static void ibmebus_remove_devices_by_id(struct of_device_id *idt) | |
279 | { | |
280 | struct device *dev; | |
281 | ||
282 | while (strlen(idt->name) > 0) { | |
283 | while ((dev = bus_find_device(&ibmebus_bus_type, NULL, | |
284 | (void*)idt->name, | |
285 | ibmebus_match_helper))) { | |
286 | ibmebus_unregister_device(dev); | |
287 | } | |
288 | idt++; | |
289 | ||
290 | } | |
291 | ||
292 | return; | |
293 | } | |
294 | ||
295 | int ibmebus_register_driver(struct ibmebus_driver *drv) | |
296 | { | |
297 | int err = 0; | |
298 | ||
299 | drv->driver.name = drv->name; | |
300 | drv->driver.bus = &ibmebus_bus_type; | |
301 | drv->driver.probe = ibmebus_bus_probe; | |
302 | drv->driver.remove = ibmebus_bus_remove; | |
303 | ||
304 | if ((err = driver_register(&drv->driver) != 0)) | |
305 | return err; | |
306 | ||
307 | ibmebus_add_devices_by_id(drv->id_table); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | EXPORT_SYMBOL(ibmebus_register_driver); | |
312 | ||
313 | void ibmebus_unregister_driver(struct ibmebus_driver *drv) | |
314 | { | |
315 | driver_unregister(&drv->driver); | |
316 | ibmebus_remove_devices_by_id(drv->id_table); | |
317 | } | |
318 | EXPORT_SYMBOL(ibmebus_unregister_driver); | |
319 | ||
320 | int ibmebus_request_irq(struct ibmebus_dev *dev, | |
321 | u32 ist, | |
322 | irqreturn_t (*handler)(int, void*, struct pt_regs *), | |
323 | unsigned long irq_flags, const char * devname, | |
324 | void *dev_id) | |
325 | { | |
0ebfff14 | 326 | unsigned int irq = irq_create_mapping(NULL, ist, 0); |
d7a30103 HS |
327 | |
328 | if (irq == NO_IRQ) | |
329 | return -EINVAL; | |
330 | ||
d7a30103 HS |
331 | return request_irq(irq, handler, |
332 | irq_flags, devname, dev_id); | |
333 | } | |
334 | EXPORT_SYMBOL(ibmebus_request_irq); | |
335 | ||
336 | void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id) | |
337 | { | |
0ebfff14 | 338 | unsigned int irq = irq_find_mapping(NULL, ist); |
d7a30103 | 339 | |
d7a30103 | 340 | free_irq(irq, dev_id); |
d7a30103 HS |
341 | } |
342 | EXPORT_SYMBOL(ibmebus_free_irq); | |
343 | ||
344 | static int ibmebus_bus_match(struct device *dev, struct device_driver *drv) | |
345 | { | |
346 | const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev); | |
347 | struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv); | |
348 | const struct of_device_id *ids = ebus_drv->id_table; | |
349 | const struct of_device_id *found_id; | |
350 | ||
351 | if (!ids) | |
352 | return 0; | |
353 | ||
354 | found_id = of_match_device(ids, &ebus_dev->ofdev); | |
355 | if (found_id) | |
356 | return 1; | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | struct bus_type ibmebus_bus_type = { | |
362 | .name = "ibmebus", | |
363 | .match = ibmebus_bus_match, | |
364 | }; | |
365 | EXPORT_SYMBOL(ibmebus_bus_type); | |
366 | ||
367 | static int __init ibmebus_bus_init(void) | |
368 | { | |
369 | int err; | |
370 | ||
371 | printk(KERN_INFO "IBM eBus Device Driver\n"); | |
372 | ||
373 | err = bus_register(&ibmebus_bus_type); | |
374 | if (err) { | |
375 | printk(KERN_ERR ":%s: failed to register IBM eBus.\n", | |
376 | __FUNCTION__); | |
377 | return err; | |
378 | } | |
379 | ||
380 | err = device_register(&ibmebus_bus_device.ofdev.dev); | |
381 | if (err) { | |
382 | printk(KERN_WARNING "%s: device_register returned %i\n", | |
383 | __FUNCTION__, err); | |
384 | bus_unregister(&ibmebus_bus_type); | |
385 | ||
386 | return err; | |
387 | } | |
388 | ||
389 | return 0; | |
390 | } | |
391 | __initcall(ibmebus_bus_init); |