blob: 9d42eb57aea3305f1ad866f6709c988363681891 [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>
Grant Likely283029d2008-01-09 06:20:40 +110044#include <linux/of.h>
Joachim Fenkesa988c0a2007-09-26 19:44:57 +100045#include <linux/of_platform.h>
Heiko J Schickd7a30102005-11-16 08:56:43 +010046#include <asm/ibmebus.h>
47#include <asm/abs_addr.h>
48
Joachim Fenkes6bccf752007-03-09 19:00:32 +010049static struct device ibmebus_bus_device = { /* fake "parent" device */
50 .bus_id = "ibmebus",
Heiko J Schickd7a30102005-11-16 08:56:43 +010051};
52
Joachim Fenkes6bccf752007-03-09 19:00:32 +010053struct bus_type ibmebus_bus_type;
54
Joachim Fenkes55347cc2007-09-26 19:45:21 +100055/* These devices will automatically be added to the bus during init */
Paul Gortmaker1b17adf12008-07-08 08:42:09 +100056static struct of_device_id __initdata ibmebus_matches[] = {
Joachim Fenkes55347cc2007-09-26 19:45:21 +100057 { .compatible = "IBM,lhca" },
58 { .compatible = "IBM,lhea" },
59 {},
60};
61
Heiko J Schickd7a30102005-11-16 08:56:43 +010062static 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;
Joachim Fenkesa8308802007-03-09 18:56:46 +010068
Heiko J Schickd7a30102005-11-16 08:56:43 +010069 mem = kmalloc(size, flag);
70 *dma_handle = (dma_addr_t)mem;
71
72 return mem;
73}
74
75static void ibmebus_free_coherent(struct device *dev,
Joachim Fenkesa8308802007-03-09 18:56:46 +010076 size_t size, void *vaddr,
Heiko J Schickd7a30102005-11-16 08:56:43 +010077 dma_addr_t dma_handle)
78{
79 kfree(vaddr);
80}
81
82static dma_addr_t ibmebus_map_single(struct device *dev,
83 void *ptr,
84 size_t size,
Mark Nelson3affedc2008-07-05 05:05:42 +100085 enum dma_data_direction direction,
86 struct dma_attrs *attrs)
Heiko J Schickd7a30102005-11-16 08:56:43 +010087{
88 return (dma_addr_t)(ptr);
89}
90
91static void ibmebus_unmap_single(struct device *dev,
92 dma_addr_t dma_addr,
Joachim Fenkesa8308802007-03-09 18:56:46 +010093 size_t size,
Mark Nelson3affedc2008-07-05 05:05:42 +100094 enum dma_data_direction direction,
95 struct dma_attrs *attrs)
Heiko J Schickd7a30102005-11-16 08:56:43 +010096{
97 return;
98}
99
100static int ibmebus_map_sg(struct device *dev,
Jens Axboe78bdc312007-10-12 13:44:12 +0200101 struct scatterlist *sgl,
Mark Nelson3affedc2008-07-05 05:05:42 +1000102 int nents, enum dma_data_direction direction,
103 struct dma_attrs *attrs)
Heiko J Schickd7a30102005-11-16 08:56:43 +0100104{
Jens Axboe78bdc312007-10-12 13:44:12 +0200105 struct scatterlist *sg;
Heiko J Schickd7a30102005-11-16 08:56:43 +0100106 int i;
Joachim Fenkesa8308802007-03-09 18:56:46 +0100107
Jens Axboe78bdc312007-10-12 13:44:12 +0200108 for_each_sg(sgl, sg, nents, i) {
Jens Axboe58b053e2007-10-22 20:02:46 +0200109 sg->dma_address = (dma_addr_t) sg_virt(sg);
Jens Axboe78bdc312007-10-12 13:44:12 +0200110 sg->dma_length = sg->length;
Heiko J Schickd7a30102005-11-16 08:56:43 +0100111 }
Joachim Fenkesa8308802007-03-09 18:56:46 +0100112
Heiko J Schickd7a30102005-11-16 08:56:43 +0100113 return nents;
114}
115
116static void ibmebus_unmap_sg(struct device *dev,
117 struct scatterlist *sg,
Mark Nelson3affedc2008-07-05 05:05:42 +1000118 int nents, enum dma_data_direction direction,
119 struct dma_attrs *attrs)
Heiko J Schickd7a30102005-11-16 08:56:43 +0100120{
121 return;
122}
123
124static int ibmebus_dma_supported(struct device *dev, u64 mask)
125{
126 return 1;
127}
128
Benjamin Herrenschmidt12d04ee2006-11-11 17:25:02 +1100129static struct dma_mapping_ops ibmebus_dma_ops = {
Heiko J Schickd7a30102005-11-16 08:56:43 +0100130 .alloc_coherent = ibmebus_alloc_coherent,
131 .free_coherent = ibmebus_free_coherent,
132 .map_single = ibmebus_map_single,
133 .unmap_single = ibmebus_unmap_single,
134 .map_sg = ibmebus_map_sg,
135 .unmap_sg = ibmebus_unmap_sg,
136 .dma_supported = ibmebus_dma_supported,
137};
138
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000139static int ibmebus_match_path(struct device *dev, void *data)
140{
141 struct device_node *dn = to_of_device(dev)->node;
142 return (dn->full_name &&
143 (strcasecmp((char *)data, dn->full_name) == 0));
144}
145
146static int ibmebus_match_node(struct device *dev, void *data)
147{
148 return to_of_device(dev)->node == data;
149}
150
151static int ibmebus_create_device(struct device_node *dn)
152{
153 struct of_device *dev;
154 int ret;
155
156 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
157 if (!dev)
158 return -ENOMEM;
159
160 dev->dev.bus = &ibmebus_bus_type;
161 dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
162
163 ret = of_device_register(dev);
164 if (ret) {
165 of_device_free(dev);
166 return ret;
167 }
168
169 return 0;
170}
171
172static int ibmebus_create_devices(const struct of_device_id *matches)
173{
174 struct device_node *root, *child;
175 int ret = 0;
176
177 root = of_find_node_by_path("/");
178
Stephen Rothwell85e99b92008-01-03 15:13:37 +1100179 for_each_child_of_node(root, child) {
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000180 if (!of_match_node(matches, child))
181 continue;
182
183 if (bus_find_device(&ibmebus_bus_type, NULL, child,
184 ibmebus_match_node))
185 continue;
186
187 ret = ibmebus_create_device(child);
188 if (ret) {
189 printk(KERN_ERR "%s: failed to create device (%i)",
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100190 __func__, ret);
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000191 of_node_put(child);
192 break;
193 }
194 }
195
196 of_node_put(root);
197 return ret;
198}
199
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000200int ibmebus_register_driver(struct of_platform_driver *drv)
Heiko J Schickd7a30102005-11-16 08:56:43 +0100201{
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000202 /* If the driver uses devices that ibmebus doesn't know, add them */
203 ibmebus_create_devices(drv->match_table);
204
Stephen Rothwell745c2ef2008-01-14 17:46:48 +1100205 return of_register_driver(drv, &ibmebus_bus_type);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100206}
207EXPORT_SYMBOL(ibmebus_register_driver);
208
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000209void ibmebus_unregister_driver(struct of_platform_driver *drv)
Joachim Fenkesa8308802007-03-09 18:56:46 +0100210{
Stephen Rothwell745c2ef2008-01-14 17:46:48 +1100211 of_unregister_driver(drv);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100212}
213EXPORT_SYMBOL(ibmebus_unregister_driver);
214
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000215int ibmebus_request_irq(u32 ist, irq_handler_t handler,
216 unsigned long irq_flags, const char *devname,
Heiko J Schickd7a30102005-11-16 08:56:43 +0100217 void *dev_id)
218{
Benjamin Herrenschmidt6e99e452006-07-10 04:44:42 -0700219 unsigned int irq = irq_create_mapping(NULL, ist);
Joachim Fenkesa8308802007-03-09 18:56:46 +0100220
Heiko J Schickd7a30102005-11-16 08:56:43 +0100221 if (irq == NO_IRQ)
222 return -EINVAL;
Joachim Fenkesa8308802007-03-09 18:56:46 +0100223
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000224 return request_irq(irq, handler, irq_flags, devname, dev_id);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100225}
226EXPORT_SYMBOL(ibmebus_request_irq);
227
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000228void ibmebus_free_irq(u32 ist, void *dev_id)
Heiko J Schickd7a30102005-11-16 08:56:43 +0100229{
Benjamin Herrenschmidt0ebfff12006-07-03 21:36:01 +1000230 unsigned int irq = irq_find_mapping(NULL, ist);
Joachim Fenkesa8308802007-03-09 18:56:46 +0100231
Heiko J Schickd7a30102005-11-16 08:56:43 +0100232 free_irq(irq, dev_id);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100233}
234EXPORT_SYMBOL(ibmebus_free_irq);
235
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100236static ssize_t name_show(struct device *dev,
237 struct device_attribute *attr, char *buf)
238{
Joachim Fenkes6b08f3a2007-09-26 19:45:51 +1000239 return sprintf(buf, "%s\n", to_of_device(dev)->node->name);
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100240}
241
242static struct device_attribute ibmebus_dev_attrs[] = {
243 __ATTR_RO(name),
244 __ATTR_NULL
245};
246
Joachim Fenkes07277022007-03-22 17:00:46 +0100247static char *ibmebus_chomp(const char *in, size_t count)
248{
Jesper Juhl61a564f2007-08-24 09:45:08 +1000249 char *out = kmalloc(count + 1, GFP_KERNEL);
250
Joachim Fenkes07277022007-03-22 17:00:46 +0100251 if (!out)
252 return NULL;
253
254 memcpy(out, in, count);
255 out[count] = '\0';
256 if (out[count - 1] == '\n')
257 out[count - 1] = '\0';
258
259 return out;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100260}
261
262static ssize_t ibmebus_store_probe(struct bus_type *bus,
263 const char *buf, size_t count)
264{
265 struct device_node *dn = NULL;
Joachim Fenkes07277022007-03-22 17:00:46 +0100266 char *path;
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000267 ssize_t rc = 0;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100268
Joachim Fenkes07277022007-03-22 17:00:46 +0100269 path = ibmebus_chomp(buf, count);
270 if (!path)
271 return -ENOMEM;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100272
Joachim Fenkes07277022007-03-22 17:00:46 +0100273 if (bus_find_device(&ibmebus_bus_type, NULL, path,
Joachim Fenkes74c9b992007-09-26 19:46:34 +1000274 ibmebus_match_path)) {
Joachim Fenkes07277022007-03-22 17:00:46 +0100275 printk(KERN_WARNING "%s: %s has already been probed\n",
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100276 __func__, path);
Joachim Fenkes74c9b992007-09-26 19:46:34 +1000277 rc = -EEXIST;
Joachim Fenkes07277022007-03-22 17:00:46 +0100278 goto out;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100279 }
280
Joachim Fenkes07277022007-03-22 17:00:46 +0100281 if ((dn = of_find_node_by_path(path))) {
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000282 rc = ibmebus_create_device(dn);
Joachim Fenkes07277022007-03-22 17:00:46 +0100283 of_node_put(dn);
Joachim Fenkes07277022007-03-22 17:00:46 +0100284 } else {
285 printk(KERN_WARNING "%s: no such device node: %s\n",
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100286 __func__, path);
Joachim Fenkes07277022007-03-22 17:00:46 +0100287 rc = -ENODEV;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100288 }
289
Joachim Fenkes07277022007-03-22 17:00:46 +0100290out:
291 kfree(path);
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000292 if (rc)
293 return rc;
294 return count;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100295}
296
297static ssize_t ibmebus_store_remove(struct bus_type *bus,
298 const char *buf, size_t count)
299{
300 struct device *dev;
Joachim Fenkes07277022007-03-22 17:00:46 +0100301 char *path;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100302
Joachim Fenkes07277022007-03-22 17:00:46 +0100303 path = ibmebus_chomp(buf, count);
304 if (!path)
305 return -ENOMEM;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100306
Joachim Fenkes07277022007-03-22 17:00:46 +0100307 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
308 ibmebus_match_path))) {
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000309 of_device_unregister(to_of_device(dev));
Joachim Fenkes07277022007-03-22 17:00:46 +0100310
311 kfree(path);
312 return count;
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100313 } else {
Joachim Fenkes07277022007-03-22 17:00:46 +0100314 printk(KERN_WARNING "%s: %s not on the bus\n",
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100315 __func__, path);
Joachim Fenkes07277022007-03-22 17:00:46 +0100316
317 kfree(path);
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100318 return -ENODEV;
319 }
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100320}
321
322static struct bus_attribute ibmebus_bus_attrs[] = {
323 __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
324 __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
325 __ATTR_NULL
326};
327
Heiko J Schickd7a30102005-11-16 08:56:43 +0100328struct bus_type ibmebus_bus_type = {
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000329 .uevent = of_device_uevent,
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100330 .dev_attrs = ibmebus_dev_attrs,
331 .bus_attrs = ibmebus_bus_attrs
Heiko J Schickd7a30102005-11-16 08:56:43 +0100332};
333EXPORT_SYMBOL(ibmebus_bus_type);
334
335static int __init ibmebus_bus_init(void)
336{
337 int err;
Joachim Fenkesa8308802007-03-09 18:56:46 +0100338
Heiko J Schickd7a30102005-11-16 08:56:43 +0100339 printk(KERN_INFO "IBM eBus Device Driver\n");
Joachim Fenkesa8308802007-03-09 18:56:46 +0100340
Joachim Fenkesa988c0a2007-09-26 19:44:57 +1000341 err = of_bus_type_init(&ibmebus_bus_type, "ibmebus");
Heiko J Schickd7a30102005-11-16 08:56:43 +0100342 if (err) {
Joachim Fenkesa988c0a2007-09-26 19:44:57 +1000343 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100344 __func__);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100345 return err;
346 }
Joachim Fenkesa8308802007-03-09 18:56:46 +0100347
Joachim Fenkes6bccf752007-03-09 19:00:32 +0100348 err = device_register(&ibmebus_bus_device);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100349 if (err) {
Joachim Fenkesa8308802007-03-09 18:56:46 +0100350 printk(KERN_WARNING "%s: device_register returned %i\n",
Harvey Harrisone48b1b42008-03-29 08:21:07 +1100351 __func__, err);
Heiko J Schickd7a30102005-11-16 08:56:43 +0100352 bus_unregister(&ibmebus_bus_type);
353
354 return err;
355 }
Joachim Fenkesa8308802007-03-09 18:56:46 +0100356
Paul Gortmaker1b17adf12008-07-08 08:42:09 +1000357 err = ibmebus_create_devices(ibmebus_matches);
Joachim Fenkes55347cc2007-09-26 19:45:21 +1000358 if (err) {
359 device_unregister(&ibmebus_bus_device);
360 bus_unregister(&ibmebus_bus_type);
361 return err;
362 }
363
Heiko J Schickd7a30102005-11-16 08:56:43 +0100364 return 0;
365}
Joachim Fenkesa988c0a2007-09-26 19:44:57 +1000366postcore_initcall(ibmebus_bus_init);