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 <linux/of_platform.h>
45 #include <asm/ibmebus.h>
46 #include <asm/abs_addr.h>
48 static struct device ibmebus_bus_device = { /* fake "parent" device */
52 struct bus_type ibmebus_bus_type;
54 /* These devices will automatically be added to the bus during init */
55 static struct of_device_id builtin_matches[] = {
56 { .compatible = "IBM,lhca" },
57 { .compatible = "IBM,lhea" },
61 static void *ibmebus_alloc_coherent(struct device *dev,
63 dma_addr_t *dma_handle,
68 mem = kmalloc(size, flag);
69 *dma_handle = (dma_addr_t)mem;
74 static void ibmebus_free_coherent(struct device *dev,
75 size_t size, void *vaddr,
76 dma_addr_t dma_handle)
81 static dma_addr_t ibmebus_map_single(struct device *dev,
84 enum dma_data_direction direction)
86 return (dma_addr_t)(ptr);
89 static void ibmebus_unmap_single(struct device *dev,
92 enum dma_data_direction direction)
97 static int ibmebus_map_sg(struct device *dev,
98 struct scatterlist *sgl,
99 int nents, enum dma_data_direction direction)
101 struct scatterlist *sg;
104 for_each_sg(sgl, sg, nents, i) {
105 sg->dma_address = (dma_addr_t) sg_virt(sg);
106 sg->dma_length = sg->length;
112 static void ibmebus_unmap_sg(struct device *dev,
113 struct scatterlist *sg,
114 int nents, enum dma_data_direction direction)
119 static int ibmebus_dma_supported(struct device *dev, u64 mask)
124 static struct dma_mapping_ops ibmebus_dma_ops = {
125 .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,
134 static int ibmebus_match_path(struct device *dev, void *data)
136 struct device_node *dn = to_of_device(dev)->node;
137 return (dn->full_name &&
138 (strcasecmp((char *)data, dn->full_name) == 0));
141 static int ibmebus_match_node(struct device *dev, void *data)
143 return to_of_device(dev)->node == data;
146 static int ibmebus_create_device(struct device_node *dn)
148 struct of_device *dev;
151 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
155 dev->dev.bus = &ibmebus_bus_type;
156 dev->dev.archdata.dma_ops = &ibmebus_dma_ops;
158 ret = of_device_register(dev);
167 static int ibmebus_create_devices(const struct of_device_id *matches)
169 struct device_node *root, *child;
172 root = of_find_node_by_path("/");
174 for (child = NULL; (child = of_get_next_child(root, child)); ) {
175 if (!of_match_node(matches, child))
178 if (bus_find_device(&ibmebus_bus_type, NULL, child,
182 ret = ibmebus_create_device(child);
184 printk(KERN_ERR "%s: failed to create device (%i)",
195 int ibmebus_register_driver(struct of_platform_driver *drv)
197 /* If the driver uses devices that ibmebus doesn't know, add them */
198 ibmebus_create_devices(drv->match_table);
200 drv->driver.name = drv->name;
201 drv->driver.bus = &ibmebus_bus_type;
203 return driver_register(&drv->driver);
205 EXPORT_SYMBOL(ibmebus_register_driver);
207 void ibmebus_unregister_driver(struct of_platform_driver *drv)
209 driver_unregister(&drv->driver);
211 EXPORT_SYMBOL(ibmebus_unregister_driver);
213 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
214 unsigned long irq_flags, const char *devname,
217 unsigned int irq = irq_create_mapping(NULL, ist);
222 return request_irq(irq, handler, irq_flags, devname, dev_id);
224 EXPORT_SYMBOL(ibmebus_request_irq);
226 void ibmebus_free_irq(u32 ist, void *dev_id)
228 unsigned int irq = irq_find_mapping(NULL, ist);
230 free_irq(irq, dev_id);
232 EXPORT_SYMBOL(ibmebus_free_irq);
234 static ssize_t name_show(struct device *dev,
235 struct device_attribute *attr, char *buf)
237 return sprintf(buf, "%s\n", to_of_device(dev)->node->name);
240 static struct device_attribute ibmebus_dev_attrs[] = {
245 static char *ibmebus_chomp(const char *in, size_t count)
247 char *out = kmalloc(count + 1, GFP_KERNEL);
252 memcpy(out, in, count);
254 if (out[count - 1] == '\n')
255 out[count - 1] = '\0';
260 static ssize_t ibmebus_store_probe(struct bus_type *bus,
261 const char *buf, size_t count)
263 struct device_node *dn = NULL;
267 path = ibmebus_chomp(buf, count);
271 if (bus_find_device(&ibmebus_bus_type, NULL, path,
272 ibmebus_match_path)) {
273 printk(KERN_WARNING "%s: %s has already been probed\n",
279 if ((dn = of_find_node_by_path(path))) {
280 rc = ibmebus_create_device(dn);
283 printk(KERN_WARNING "%s: no such device node: %s\n",
295 static ssize_t ibmebus_store_remove(struct bus_type *bus,
296 const char *buf, size_t count)
301 path = ibmebus_chomp(buf, count);
305 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
306 ibmebus_match_path))) {
307 of_device_unregister(to_of_device(dev));
312 printk(KERN_WARNING "%s: %s not on the bus\n",
320 static struct bus_attribute ibmebus_bus_attrs[] = {
321 __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
322 __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
326 struct bus_type ibmebus_bus_type = {
327 .uevent = of_device_uevent,
328 .dev_attrs = ibmebus_dev_attrs,
329 .bus_attrs = ibmebus_bus_attrs
331 EXPORT_SYMBOL(ibmebus_bus_type);
333 static int __init ibmebus_bus_init(void)
337 printk(KERN_INFO "IBM eBus Device Driver\n");
339 err = of_bus_type_init(&ibmebus_bus_type, "ibmebus");
341 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
346 err = device_register(&ibmebus_bus_device);
348 printk(KERN_WARNING "%s: device_register returned %i\n",
350 bus_unregister(&ibmebus_bus_type);
355 err = ibmebus_create_devices(builtin_matches);
357 device_unregister(&ibmebus_bus_device);
358 bus_unregister(&ibmebus_bus_type);
364 postcore_initcall(ibmebus_bus_init);