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;
191 const char *loc_code;
194 loc_code = of_get_property(dn, "ibm,loc-code", NULL);
196 printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
197 __FUNCTION__, dn->name ? dn->name : "<unknown>");
198 return ERR_PTR(-EINVAL);
201 if (strlen(loc_code) == 0) {
202 printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
204 return ERR_PTR(-EINVAL);
207 dev = kzalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
209 return ERR_PTR(-ENOMEM);
212 dev->ofdev.node = of_node_get(dn);
214 length = strlen(loc_code);
215 memcpy(dev->ofdev.dev.bus_id, loc_code
216 + (length - min(length, BUS_ID_SIZE - 1)),
217 min(length, BUS_ID_SIZE - 1));
219 /* Register with generic device framework. */
220 if (ibmebus_register_device_common(dev, dn->name) != 0) {
222 return ERR_PTR(-ENODEV);
228 static void ibmebus_probe_of_nodes(char* name)
230 struct device_node *dn = NULL;
232 while ((dn = of_find_node_by_name(dn, name))) {
233 if (IS_ERR(ibmebus_register_device_node(dn))) {
244 static void ibmebus_add_devices_by_id(struct of_device_id *idt)
246 while (strlen(idt->name) > 0) {
247 ibmebus_probe_of_nodes(idt->name);
254 static int ibmebus_match_name(struct device *dev, void *data)
256 const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
259 name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
261 if (name && (strcmp(data, name) == 0))
267 static int ibmebus_unregister_device(struct device *dev)
269 of_device_unregister(to_of_device(dev));
274 static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
278 while (strlen(idt->name) > 0) {
279 while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
281 ibmebus_match_name))) {
282 ibmebus_unregister_device(dev);
290 int ibmebus_register_driver(struct ibmebus_driver *drv)
294 drv->driver.name = drv->name;
295 drv->driver.bus = &ibmebus_bus_type;
296 drv->driver.probe = ibmebus_bus_probe;
297 drv->driver.remove = ibmebus_bus_remove;
299 if ((err = driver_register(&drv->driver) != 0))
302 /* remove all supported devices first, in case someone
303 * probed them manually before registering the driver */
304 ibmebus_remove_devices_by_id(drv->id_table);
305 ibmebus_add_devices_by_id(drv->id_table);
309 EXPORT_SYMBOL(ibmebus_register_driver);
311 void ibmebus_unregister_driver(struct ibmebus_driver *drv)
313 driver_unregister(&drv->driver);
314 ibmebus_remove_devices_by_id(drv->id_table);
316 EXPORT_SYMBOL(ibmebus_unregister_driver);
318 int ibmebus_request_irq(struct ibmebus_dev *dev,
320 irq_handler_t handler,
321 unsigned long irq_flags, const char * devname,
324 unsigned int irq = irq_create_mapping(NULL, ist);
329 return request_irq(irq, handler,
330 irq_flags, devname, dev_id);
332 EXPORT_SYMBOL(ibmebus_request_irq);
334 void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
336 unsigned int irq = irq_find_mapping(NULL, ist);
338 free_irq(irq, dev_id);
340 EXPORT_SYMBOL(ibmebus_free_irq);
342 static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
344 const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
345 struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv);
346 const struct of_device_id *ids = ebus_drv->id_table;
347 const struct of_device_id *found_id;
352 found_id = of_match_device(ids, &ebus_dev->ofdev);
359 static ssize_t name_show(struct device *dev,
360 struct device_attribute *attr, char *buf)
362 struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
363 const char *name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
364 return sprintf(buf, "%s\n", name);
367 static struct device_attribute ibmebus_dev_attrs[] = {
372 static int ibmebus_match_path(struct device *dev, void *data)
375 struct device_node *dn =
376 of_node_get(to_ibmebus_dev(dev)->ofdev.node);
378 rc = (dn->full_name && (strcasecmp((char*)data, dn->full_name) == 0));
384 static char *ibmebus_chomp(const char *in, size_t count)
386 char *out = (char*)kmalloc(count + 1, GFP_KERNEL);
390 memcpy(out, in, count);
392 if (out[count - 1] == '\n')
393 out[count - 1] = '\0';
398 static ssize_t ibmebus_store_probe(struct bus_type *bus,
399 const char *buf, size_t count)
401 struct device_node *dn = NULL;
402 struct ibmebus_dev *dev;
406 path = ibmebus_chomp(buf, count);
410 if (bus_find_device(&ibmebus_bus_type, NULL, path,
411 ibmebus_match_path)) {
412 printk(KERN_WARNING "%s: %s has already been probed\n",
418 if ((dn = of_find_node_by_path(path))) {
419 dev = ibmebus_register_device_node(dn);
421 rc = IS_ERR(dev) ? PTR_ERR(dev) : count;
423 printk(KERN_WARNING "%s: no such device node: %s\n",
433 static ssize_t ibmebus_store_remove(struct bus_type *bus,
434 const char *buf, size_t count)
439 path = ibmebus_chomp(buf, count);
443 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
444 ibmebus_match_path))) {
445 ibmebus_unregister_device(dev);
450 printk(KERN_WARNING "%s: %s not on the bus\n",
458 static struct bus_attribute ibmebus_bus_attrs[] = {
459 __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
460 __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
464 struct bus_type ibmebus_bus_type = {
466 .match = ibmebus_bus_match,
467 .dev_attrs = ibmebus_dev_attrs,
468 .bus_attrs = ibmebus_bus_attrs
470 EXPORT_SYMBOL(ibmebus_bus_type);
472 static int __init ibmebus_bus_init(void)
476 printk(KERN_INFO "IBM eBus Device Driver\n");
478 err = bus_register(&ibmebus_bus_type);
480 printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
485 err = device_register(&ibmebus_bus_device);
487 printk(KERN_WARNING "%s: device_register returned %i\n",
489 bus_unregister(&ibmebus_bus_type);
496 __initcall(ibmebus_bus_init);