blob: 72fd87156b24b662ee8abb08878197c3a6b6a02b [file] [log] [blame]
Heiko J Schickd7a30102005-11-16 08:56:43 +01001/*
2 * IBM PowerPC IBM eBus Infrastructure Support.
3 *
4 * Copyright (c) 2005 IBM Corporation
Joachim Fenkes6bccf752007-03-09 19:00:32 +01005 * Joachim Fenkes <fenkes@de.ibm.com>
Heiko J Schickd7a30102005-11-16 08:56:43 +01006 * Heiko J Schick <schickhj@de.ibm.com>
Joachim Fenkesa8308802007-03-09 18:56:46 +01007 *
Heiko J Schickd7a30102005-11-16 08:56:43 +01008 * All rights reserved.
9 *
Joachim Fenkesa8308802007-03-09 18:56:46 +010010 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
11 * BSD.
Heiko J Schickd7a30102005-11-16 08:56:43 +010012 *
13 * OpenIB BSD License
14 *
Joachim Fenkesa8308802007-03-09 18:56:46 +010015 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions are met:
Heiko J Schickd7a30102005-11-16 08:56:43 +010017 *
Joachim Fenkesa8308802007-03-09 18:56:46 +010018 * Redistributions of source code must retain the above copyright notice, this
19 * list of conditions and the following disclaimer.
Heiko J Schickd7a30102005-11-16 08:56:43 +010020 *
Joachim Fenkesa8308802007-03-09 18:56:46 +010021 * Redistributions in binary form must reproduce the above copyright notice,
22 * this list of conditions and the following disclaimer in the documentation
Heiko J Schickd7a30102005-11-16 08:56:43 +010023 * and/or other materials
Joachim Fenkesa8308802007-03-09 18:56:46 +010024 * provided with the distribution.
Heiko J Schickd7a30102005-11-16 08:56:43 +010025 *
Joachim Fenkesa8308802007-03-09 18:56:46 +010026 * 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
Heiko J Schickd7a30102005-11-16 08:56:43 +010032 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
33 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
Joachim Fenkesa8308802007-03-09 18:56:46 +010034 * 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
Heiko J Schickd7a30102005-11-16 08:56:43 +010036 * 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>
Joachim Fenkesa988c0a2007-09-26 19:44:57 +100044#include <linux/of_platform.h>
Heiko J Schickd7a30102005-11-16 08:56:43 +010045#include <asm/ibmebus.h>
46#include <asm/abs_addr.h>
47
Joachim Fenkes6bccf752007-03-09 19:00:32 +010048static struct device ibmebus_bus_device = { /* fake "parent" device */
49 .bus_id = "ibmebus",
Heiko J Schickd7a30102005-11-16 08:56:43 +010050};
51
Joachim Fenkes6bccf752007-03-09 19:00:32 +010052struct bus_type ibmebus_bus_type;
53
Joachim Fenkes55347cc2007-09-26 19:45:21 +100054/* These devices will automatically be added to the bus during init */
55static struct of_device_id builtin_matches[] = {
56 { .compatible = "IBM,lhca" },
57 { .compatible = "IBM,lhea" },
58 {},
59};
60
Heiko J Schickd7a30102005-11-16 08:56:43 +010061static 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;
Joachim Fenkesa8308802007-03-09 18:56:46 +010067
Heiko J Schickd7a30102005-11-16 08:56:43 +010068 mem = kmalloc(size, flag);
69 *dma_handle = (dma_addr_t)mem;
70
71 return mem;
72}
73
74static void ibmebus_free_coherent(struct device *dev,
Joachim Fenkesa8308802007-03-09 18:56:46 +010075 size_t size, void *vaddr,
Heiko J Schickd7a30102005-11-16 08:56:43 +010076 dma_addr_t dma_handle)
77{
78 kfree(vaddr);
79}
80
81static 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
89static void ibmebus_unmap_single(struct device *dev,
90 dma_addr_t dma_addr,
Joachim Fenkesa8308802007-03-09 18:56:46 +010091 size_t size,
Heiko J Schickd7a30102005-11-16 08:56:43 +010092 enum dma_data_direction direction)
93{
94 return;
95}
96
97static int ibmebus_map_sg(struct device *dev,
Jens Axboe78bdc312007-10-12 13:44:12 +020098 struct scatterlist *sgl,
Heiko J Schickd7a30102005-11-16 08:56:43 +010099 int nents, enum dma_data_direction direction)
100{
Jens Axboe78bdc312007-10-12 13:44:12 +0200101 struct scatterlist *sg;
Heiko J Schickd7a30102005-11-16 08:56:43 +0100102 int i;
Joachim Fenkesa8308802007-03-09 18:56:46 +0100103
Jens Axboe78bdc312007-10-12 13:44:12 +0200104 for_each_sg(sgl, sg, nents, i) {
Jens Axboe58b053e2007-10-22 20:02:46 +0200105 sg->dma_address = (dma_addr_t) sg_virt(sg);
Jens Axboe78bdc312007-10-12 13:44:12 +0200106 sg->dma_length = sg->length;
Heiko J Schickd7a30102005-11-16 08:56:43 +0100107 }
Joachim Fenkesa8308802007-03-09 18:56:46 +0100108
Heiko J Schickd7a30102005-11-16 08:56:43 +0100109 return nents;
110}
111
112static void ibmebus_unmap_sg(struct device *dev,
113 struct scatterlist *sg,
114 int nents, enum dma_data_direction direction)
115{
116 return;
117}
118
119static int ibmebus_dma_supported(struct device *dev, u64 mask)
120{
121 return 1;
122}
123
Benjamin Herrenschmidt12d04ee2006-11-11 17:25:02 +1100124static struct dma_mapping_ops ibmebus_dma_ops = {
Heiko J Schickd7a30102005-11-16 08:56:43 +0100125 .alloc_coherent = ibmebus_alloc_coherent,
126 .free_coherent = ibmebus_free_coherent,
127 .map_single = ibmebus_map_single,
128 .unmap_single = ibmebus_unmap_single,
129 .map_sg = ibmebus_map_sg,
130 .unmap_sg = ibmebus_unmap_sg,
131 .dma_supported = ibmebus_dma_supported,
132};
133
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000134static int ibmebus_match_path(struct device *dev, void *data)
135{
136 struct device_node *dn = to_of_device(dev)->node;
137 return (dn->full_name &&
138 (strcasecmp((char *)data, dn->full_name) == 0));
139}
140
141static int ibmebus_match_node(struct device *dev, void *data)
142{
143 return to_of_device(dev)->node == data;
144}
145
146static int ibmebus_create_device(struct device_node *dn)
147{
148 struct of_device *dev;
149 int ret;
150
151 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
152 if (!dev)
153 return -ENOMEM;
154
155 dev->dev.bus = &ibmebus_bus_type;
156 dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
157
158 ret = of_device_register(dev);
159 if (ret) {
160 of_device_free(dev);
161 return ret;
162 }
163
164 return 0;
165}
166
167static int ibmebus_create_devices(const struct of_device_id *matches)
168{
169 struct device_node *root, *child;
170 int ret = 0;
171
172 root = of_find_node_by_path("/");
173
174 for (child = NULL; (child = of_get_next_child(root, child)); ) {
175 if (!of_match_node(matches, child))
176 continue;
177
178 if (bus_find_device(&ibmebus_bus_type, NULL, child,
179 ibmebus_match_node))
180 continue;
181
182 ret = ibmebus_create_device(child);
183 if (ret) {
184 printk(KERN_ERR "%s: failed to create device (%i)",
185 __FUNCTION__, ret);
186 of_node_put(child);
187 break;
188 }
189 }
190
191 of_node_put(root);
192 return ret;
193}
194
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000195int ibmebus_register_driver(struct of_platform_driver *drv)
Heiko J Schickd7a30102005-11-16 08:56:43 +0100196{
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000197 /* If the driver uses devices that ibmebus doesn't know, add them */
198 ibmebus_create_devices(drv->match_table);
199
200 drv->driver.name = drv->name;
201 drv->driver.bus = &ibmebus_bus_type;
202
203 return driver_register(&drv->driver);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100204}
205EXPORT_SYMBOL(ibmebus_register_driver);
206
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000207void ibmebus_unregister_driver(struct of_platform_driver *drv)
Joachim Fenkesa8308802007-03-09 18:56:46 +0100208{
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000209 driver_unregister(&drv->driver);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100210}
211EXPORT_SYMBOL(ibmebus_unregister_driver);
212
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000213int ibmebus_request_irq(u32 ist, irq_handler_t handler,
214 unsigned long irq_flags, const char *devname,
Heiko J Schickd7a30102005-11-16 08:56:43 +0100215 void *dev_id)
216{
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700217 unsigned int irq = irq_create_mapping(NULL, ist);
Joachim Fenkesa8308802007-03-09 18:56:46 +0100218
Heiko J Schickd7a30102005-11-16 08:56:43 +0100219 if (irq == NO_IRQ)
220 return -EINVAL;
Joachim Fenkesa8308802007-03-09 18:56:46 +0100221
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000222 return request_irq(irq, handler, irq_flags, devname, dev_id);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100223}
224EXPORT_SYMBOL(ibmebus_request_irq);
225
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000226void ibmebus_free_irq(u32 ist, void *dev_id)
Heiko J Schickd7a30102005-11-16 08:56:43 +0100227{
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000228 unsigned int irq = irq_find_mapping(NULL, ist);
Joachim Fenkesa8308802007-03-09 18:56:46 +0100229
Heiko J Schickd7a30102005-11-16 08:56:43 +0100230 free_irq(irq, dev_id);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100231}
232EXPORT_SYMBOL(ibmebus_free_irq);
233
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100234static ssize_t name_show(struct device *dev,
235 struct device_attribute *attr, char *buf)
236{
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000237 return sprintf(buf, "%s\n", to_of_device(dev)->node->name);
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100238}
239
240static struct device_attribute ibmebus_dev_attrs[] = {
241 __ATTR_RO(name),
242 __ATTR_NULL
243};
244
Joachim Fenkes07277022007-03-22 17:00:46 +0100245static char *ibmebus_chomp(const char *in, size_t count)
246{
Jesper Juhl61a564f2007-08-24 09:45:08 +1000247 char *out = kmalloc(count + 1, GFP_KERNEL);
248
Joachim Fenkes07277022007-03-22 17:00:46 +0100249 if (!out)
250 return NULL;
251
252 memcpy(out, in, count);
253 out[count] = '\0';
254 if (out[count - 1] == '\n')
255 out[count - 1] = '\0';
256
257 return out;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100258}
259
260static ssize_t ibmebus_store_probe(struct bus_type *bus,
261 const char *buf, size_t count)
262{
263 struct device_node *dn = NULL;
Joachim Fenkes07277022007-03-22 17:00:46 +0100264 char *path;
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000265 ssize_t rc = 0;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100266
Joachim Fenkes07277022007-03-22 17:00:46 +0100267 path = ibmebus_chomp(buf, count);
268 if (!path)
269 return -ENOMEM;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100270
Joachim Fenkes07277022007-03-22 17:00:46 +0100271 if (bus_find_device(&ibmebus_bus_type, NULL, path,
Joachim Fenkes74c9b992007-09-26 19:46:34 +1000272 ibmebus_match_path)) {
Joachim Fenkes07277022007-03-22 17:00:46 +0100273 printk(KERN_WARNING "%s: %s has already been probed\n",
274 __FUNCTION__, path);
Joachim Fenkes74c9b992007-09-26 19:46:34 +1000275 rc = -EEXIST;
Joachim Fenkes07277022007-03-22 17:00:46 +0100276 goto out;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100277 }
278
Joachim Fenkes07277022007-03-22 17:00:46 +0100279 if ((dn = of_find_node_by_path(path))) {
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000280 rc = ibmebus_create_device(dn);
Joachim Fenkes07277022007-03-22 17:00:46 +0100281 of_node_put(dn);
Joachim Fenkes07277022007-03-22 17:00:46 +0100282 } else {
283 printk(KERN_WARNING "%s: no such device node: %s\n",
284 __FUNCTION__, path);
285 rc = -ENODEV;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100286 }
287
Joachim Fenkes07277022007-03-22 17:00:46 +0100288out:
289 kfree(path);
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000290 if (rc)
291 return rc;
292 return count;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100293}
294
295static ssize_t ibmebus_store_remove(struct bus_type *bus,
296 const char *buf, size_t count)
297{
298 struct device *dev;
Joachim Fenkes07277022007-03-22 17:00:46 +0100299 char *path;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100300
Joachim Fenkes07277022007-03-22 17:00:46 +0100301 path = ibmebus_chomp(buf, count);
302 if (!path)
303 return -ENOMEM;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100304
Joachim Fenkes07277022007-03-22 17:00:46 +0100305 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
306 ibmebus_match_path))) {
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000307 of_device_unregister(to_of_device(dev));
Joachim Fenkes07277022007-03-22 17:00:46 +0100308
309 kfree(path);
310 return count;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100311 } else {
Joachim Fenkes07277022007-03-22 17:00:46 +0100312 printk(KERN_WARNING "%s: %s not on the bus\n",
313 __FUNCTION__, path);
314
315 kfree(path);
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100316 return -ENODEV;
317 }
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100318}
319
320static struct bus_attribute ibmebus_bus_attrs[] = {
321 __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
322 __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
323 __ATTR_NULL
324};
325
Heiko J Schickd7a30102005-11-16 08:56:43 +0100326struct bus_type ibmebus_bus_type = {
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000327 .uevent = of_device_uevent,
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100328 .dev_attrs = ibmebus_dev_attrs,
329 .bus_attrs = ibmebus_bus_attrs
Heiko J Schickd7a30102005-11-16 08:56:43 +0100330};
331EXPORT_SYMBOL(ibmebus_bus_type);
332
333static int __init ibmebus_bus_init(void)
334{
335 int err;
Joachim Fenkesa8308802007-03-09 18:56:46 +0100336
Heiko J Schickd7a30102005-11-16 08:56:43 +0100337 printk(KERN_INFO "IBM eBus Device Driver\n");
Joachim Fenkesa8308802007-03-09 18:56:46 +0100338
Joachim Fenkesa988c0a2007-09-26 19:44:57 +1000339 err = of_bus_type_init(&ibmebus_bus_type, "ibmebus");
Heiko J Schickd7a30102005-11-16 08:56:43 +0100340 if (err) {
Joachim Fenkesa988c0a2007-09-26 19:44:57 +1000341 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
Heiko J Schickd7a30102005-11-16 08:56:43 +0100342 __FUNCTION__);
343 return err;
344 }
Joachim Fenkesa8308802007-03-09 18:56:46 +0100345
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100346 err = device_register(&ibmebus_bus_device);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100347 if (err) {
Joachim Fenkesa8308802007-03-09 18:56:46 +0100348 printk(KERN_WARNING "%s: device_register returned %i\n",
Heiko J Schickd7a30102005-11-16 08:56:43 +0100349 __FUNCTION__, err);
350 bus_unregister(&ibmebus_bus_type);
351
352 return err;
353 }
Joachim Fenkesa8308802007-03-09 18:56:46 +0100354
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000355 err = ibmebus_create_devices(builtin_matches);
356 if (err) {
357 device_unregister(&ibmebus_bus_device);
358 bus_unregister(&ibmebus_bus_type);
359 return err;
360 }
361
Heiko J Schickd7a30102005-11-16 08:56:43 +0100362 return 0;
363}
Joachim Fenkesa988c0a2007-09-26 19:44:57 +1000364postcore_initcall(ibmebus_bus_init);