2 * IBM PowerPC IBM eBus Infrastructure Support.
4 * Copyright (c) 2005 IBM Corporation
5 * Joachim Fenkes <fenkes@de.ibm.com>
6 * Heiko J Schick <schickhj@de.ibm.com>
10 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions are met:
18 * Redistributions of source code must retain the above copyright notice, this
19 * list of conditions and the following disclaimer.
21 * Redistributions in binary form must reproduce the above copyright notice,
22 * this list of conditions and the following disclaimer in the documentation
23 * and/or other materials
24 * provided with the distribution.
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
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
33 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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
36 * POSSIBILITY OF SUCH DAMAGE.
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>
44 #include <asm/ibmebus.h>
45 #include <asm/abs_addr.h>
47 static struct device ibmebus_bus_device = { /* fake "parent" device */
51 struct bus_type ibmebus_bus_type;
53 static void *ibmebus_alloc_coherent(struct device *dev,
55 dma_addr_t *dma_handle,
60 mem = kmalloc(size, flag);
61 *dma_handle = (dma_addr_t)mem;
66 static void ibmebus_free_coherent(struct device *dev,
67 size_t size, void *vaddr,
68 dma_addr_t dma_handle)
73 static dma_addr_t ibmebus_map_single(struct device *dev,
76 enum dma_data_direction direction)
78 return (dma_addr_t)(ptr);
81 static void ibmebus_unmap_single(struct device *dev,
84 enum dma_data_direction direction)
89 static int ibmebus_map_sg(struct device *dev,
90 struct scatterlist *sg,
91 int nents, enum dma_data_direction direction)
95 for (i = 0; i < nents; i++) {
96 sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
98 sg[i].dma_length = sg[i].length;
104 static void ibmebus_unmap_sg(struct device *dev,
105 struct scatterlist *sg,
106 int nents, enum dma_data_direction direction)
111 static int ibmebus_dma_supported(struct device *dev, u64 mask)
116 static struct dma_mapping_ops ibmebus_dma_ops = {
117 .alloc_coherent = ibmebus_alloc_coherent,
118 .free_coherent = ibmebus_free_coherent,
119 .map_single = ibmebus_map_single,
120 .unmap_single = ibmebus_unmap_single,
121 .map_sg = ibmebus_map_sg,
122 .unmap_sg = ibmebus_unmap_sg,
123 .dma_supported = ibmebus_dma_supported,
126 static int ibmebus_bus_probe(struct device *dev)
128 struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
129 struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
130 const struct of_device_id *id;
133 if (!ibmebusdrv->probe)
136 id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
138 error = ibmebusdrv->probe(ibmebusdev, id);
144 static int ibmebus_bus_remove(struct device *dev)
146 struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
147 struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
149 if (ibmebusdrv->remove) {
150 return ibmebusdrv->remove(ibmebusdev);
156 static void __devinit ibmebus_dev_release(struct device *dev)
158 of_node_put(to_ibmebus_dev(dev)->ofdev.node);
159 kfree(to_ibmebus_dev(dev));
162 static int __devinit ibmebus_register_device_common(
163 struct ibmebus_dev *dev, const char *name)
167 dev->ofdev.dev.parent = &ibmebus_bus_device;
168 dev->ofdev.dev.bus = &ibmebus_bus_type;
169 dev->ofdev.dev.release = ibmebus_dev_release;
171 dev->ofdev.dev.archdata.of_node = dev->ofdev.node;
172 dev->ofdev.dev.archdata.dma_ops = &ibmebus_dma_ops;
173 dev->ofdev.dev.archdata.numa_node = of_node_to_nid(dev->ofdev.node);
175 /* An ibmebusdev is based on a of_device. We have to change the
176 * bus type to use our own DMA mapping operations.
178 if ((err = of_device_register(&dev->ofdev)) != 0) {
179 printk(KERN_ERR "%s: failed to register device (%d).\n",
187 static struct ibmebus_dev* __devinit ibmebus_register_device_node(
188 struct device_node *dn)
190 struct ibmebus_dev *dev;
193 dev = kzalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
195 return ERR_PTR(-ENOMEM);
197 dev->ofdev.node = of_node_get(dn);
199 len = strlen(dn->full_name + 1);
200 bus_len = min(len, BUS_ID_SIZE - 1);
201 memcpy(dev->ofdev.dev.bus_id, dn->full_name + 1
202 + (len - bus_len), bus_len);
203 for (i = 0; i < bus_len; i++)
204 if (dev->ofdev.dev.bus_id[i] == '/')
205 dev->ofdev.dev.bus_id[i] = '_';
207 /* Register with generic device framework. */
208 if (ibmebus_register_device_common(dev, dn->name) != 0) {
210 return ERR_PTR(-ENODEV);
216 static void ibmebus_probe_of_nodes(char* name)
218 struct device_node *dn = NULL;
220 while ((dn = of_find_node_by_name(dn, name))) {
221 if (IS_ERR(ibmebus_register_device_node(dn))) {
232 static void ibmebus_add_devices_by_id(struct of_device_id *idt)
234 while (strlen(idt->name) > 0) {
235 ibmebus_probe_of_nodes(idt->name);
242 static int ibmebus_match_name(struct device *dev, void *data)
244 const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
247 name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
249 if (name && (strcmp(data, name) == 0))
255 static int ibmebus_unregister_device(struct device *dev)
257 of_device_unregister(to_of_device(dev));
262 static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
266 while (strlen(idt->name) > 0) {
267 while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
269 ibmebus_match_name))) {
270 ibmebus_unregister_device(dev);
278 int ibmebus_register_driver(struct ibmebus_driver *drv)
282 drv->driver.name = drv->name;
283 drv->driver.bus = &ibmebus_bus_type;
284 drv->driver.probe = ibmebus_bus_probe;
285 drv->driver.remove = ibmebus_bus_remove;
287 if ((err = driver_register(&drv->driver) != 0))
290 /* remove all supported devices first, in case someone
291 * probed them manually before registering the driver */
292 ibmebus_remove_devices_by_id(drv->id_table);
293 ibmebus_add_devices_by_id(drv->id_table);
297 EXPORT_SYMBOL(ibmebus_register_driver);
299 void ibmebus_unregister_driver(struct ibmebus_driver *drv)
301 driver_unregister(&drv->driver);
302 ibmebus_remove_devices_by_id(drv->id_table);
304 EXPORT_SYMBOL(ibmebus_unregister_driver);
306 int ibmebus_request_irq(struct ibmebus_dev *dev,
308 irq_handler_t handler,
309 unsigned long irq_flags, const char * devname,
312 unsigned int irq = irq_create_mapping(NULL, ist);
317 return request_irq(irq, handler,
318 irq_flags, devname, dev_id);
320 EXPORT_SYMBOL(ibmebus_request_irq);
322 void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
324 unsigned int irq = irq_find_mapping(NULL, ist);
326 free_irq(irq, dev_id);
328 EXPORT_SYMBOL(ibmebus_free_irq);
330 static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
332 const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
333 struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv);
334 const struct of_device_id *ids = ebus_drv->id_table;
335 const struct of_device_id *found_id;
340 found_id = of_match_device(ids, &ebus_dev->ofdev);
347 static ssize_t name_show(struct device *dev,
348 struct device_attribute *attr, char *buf)
350 struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
351 const char *name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
352 return sprintf(buf, "%s\n", name);
355 static struct device_attribute ibmebus_dev_attrs[] = {
360 static int ibmebus_match_path(struct device *dev, void *data)
363 struct device_node *dn =
364 of_node_get(to_ibmebus_dev(dev)->ofdev.node);
366 rc = (dn->full_name && (strcasecmp((char*)data, dn->full_name) == 0));
372 static char *ibmebus_chomp(const char *in, size_t count)
374 char *out = kmalloc(count + 1, GFP_KERNEL);
379 memcpy(out, in, count);
381 if (out[count - 1] == '\n')
382 out[count - 1] = '\0';
387 static ssize_t ibmebus_store_probe(struct bus_type *bus,
388 const char *buf, size_t count)
390 struct device_node *dn = NULL;
391 struct ibmebus_dev *dev;
395 path = ibmebus_chomp(buf, count);
399 if (bus_find_device(&ibmebus_bus_type, NULL, path,
400 ibmebus_match_path)) {
401 printk(KERN_WARNING "%s: %s has already been probed\n",
407 if ((dn = of_find_node_by_path(path))) {
408 dev = ibmebus_register_device_node(dn);
410 rc = IS_ERR(dev) ? PTR_ERR(dev) : count;
412 printk(KERN_WARNING "%s: no such device node: %s\n",
422 static ssize_t ibmebus_store_remove(struct bus_type *bus,
423 const char *buf, size_t count)
428 path = ibmebus_chomp(buf, count);
432 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
433 ibmebus_match_path))) {
434 ibmebus_unregister_device(dev);
439 printk(KERN_WARNING "%s: %s not on the bus\n",
447 static struct bus_attribute ibmebus_bus_attrs[] = {
448 __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
449 __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
453 struct bus_type ibmebus_bus_type = {
455 .match = ibmebus_bus_match,
456 .dev_attrs = ibmebus_dev_attrs,
457 .bus_attrs = ibmebus_bus_attrs
459 EXPORT_SYMBOL(ibmebus_bus_type);
461 static int __init ibmebus_bus_init(void)
465 printk(KERN_INFO "IBM eBus Device Driver\n");
467 err = bus_register(&ibmebus_bus_type);
469 printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
474 err = device_register(&ibmebus_bus_device);
476 printk(KERN_WARNING "%s: device_register returned %i\n",
478 bus_unregister(&ibmebus_bus_type);
485 __initcall(ibmebus_bus_init);