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 static void *ibmebus_alloc_coherent(struct device *dev,
56 dma_addr_t *dma_handle,
61 mem = kmalloc(size, flag);
62 *dma_handle = (dma_addr_t)mem;
67 static void ibmebus_free_coherent(struct device *dev,
68 size_t size, void *vaddr,
69 dma_addr_t dma_handle)
74 static dma_addr_t ibmebus_map_single(struct device *dev,
77 enum dma_data_direction direction)
79 return (dma_addr_t)(ptr);
82 static void ibmebus_unmap_single(struct device *dev,
85 enum dma_data_direction direction)
90 static int ibmebus_map_sg(struct device *dev,
91 struct scatterlist *sgl,
92 int nents, enum dma_data_direction direction)
94 struct scatterlist *sg;
97 for_each_sg(sgl, sg, nents, i) {
98 sg->dma_address = (dma_addr_t)page_address(sg->page)
100 sg->dma_length = sg->length;
106 static void ibmebus_unmap_sg(struct device *dev,
107 struct scatterlist *sg,
108 int nents, enum dma_data_direction direction)
113 static int ibmebus_dma_supported(struct device *dev, u64 mask)
118 static struct dma_mapping_ops ibmebus_dma_ops = {
119 .alloc_coherent = ibmebus_alloc_coherent,
120 .free_coherent = ibmebus_free_coherent,
121 .map_single = ibmebus_map_single,
122 .unmap_single = ibmebus_unmap_single,
123 .map_sg = ibmebus_map_sg,
124 .unmap_sg = ibmebus_unmap_sg,
125 .dma_supported = ibmebus_dma_supported,
128 int ibmebus_register_driver(struct ibmebus_driver *drv)
132 EXPORT_SYMBOL(ibmebus_register_driver);
134 void ibmebus_unregister_driver(struct ibmebus_driver *drv)
137 EXPORT_SYMBOL(ibmebus_unregister_driver);
139 int ibmebus_request_irq(struct ibmebus_dev *dev,
141 irq_handler_t handler,
142 unsigned long irq_flags, const char * devname,
145 unsigned int irq = irq_create_mapping(NULL, ist);
150 return request_irq(irq, handler,
151 irq_flags, devname, dev_id);
153 EXPORT_SYMBOL(ibmebus_request_irq);
155 void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
157 unsigned int irq = irq_find_mapping(NULL, ist);
159 free_irq(irq, dev_id);
161 EXPORT_SYMBOL(ibmebus_free_irq);
163 static ssize_t name_show(struct device *dev,
164 struct device_attribute *attr, char *buf)
166 struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
167 const char *name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
168 return sprintf(buf, "%s\n", name);
171 static struct device_attribute ibmebus_dev_attrs[] = {
176 static int ibmebus_match_path(struct device *dev, void *data)
179 struct device_node *dn =
180 of_node_get(to_ibmebus_dev(dev)->ofdev.node);
182 rc = (dn->full_name && (strcasecmp((char*)data, dn->full_name) == 0));
188 static char *ibmebus_chomp(const char *in, size_t count)
190 char *out = kmalloc(count + 1, GFP_KERNEL);
195 memcpy(out, in, count);
197 if (out[count - 1] == '\n')
198 out[count - 1] = '\0';
203 static ssize_t ibmebus_store_probe(struct bus_type *bus,
204 const char *buf, size_t count)
206 struct device_node *dn = NULL;
207 struct ibmebus_dev *dev;
211 path = ibmebus_chomp(buf, count);
215 if (bus_find_device(&ibmebus_bus_type, NULL, path,
216 ibmebus_match_path)) {
217 printk(KERN_WARNING "%s: %s has already been probed\n",
223 if ((dn = of_find_node_by_path(path))) {
224 /* dev = ibmebus_register_device_node(dn); */
226 rc = IS_ERR(dev) ? PTR_ERR(dev) : count;
228 printk(KERN_WARNING "%s: no such device node: %s\n",
238 static ssize_t ibmebus_store_remove(struct bus_type *bus,
239 const char *buf, size_t count)
244 path = ibmebus_chomp(buf, count);
248 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
249 ibmebus_match_path))) {
250 /* ibmebus_unregister_device(dev); */
255 printk(KERN_WARNING "%s: %s not on the bus\n",
263 static struct bus_attribute ibmebus_bus_attrs[] = {
264 __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
265 __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
269 struct bus_type ibmebus_bus_type = {
270 .dev_attrs = ibmebus_dev_attrs,
271 .bus_attrs = ibmebus_bus_attrs
273 EXPORT_SYMBOL(ibmebus_bus_type);
275 static int __init ibmebus_bus_init(void)
279 printk(KERN_INFO "IBM eBus Device Driver\n");
281 err = of_bus_type_init(&ibmebus_bus_type, "ibmebus");
283 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
288 err = device_register(&ibmebus_bus_device);
290 printk(KERN_WARNING "%s: device_register returned %i\n",
292 bus_unregister(&ibmebus_bus_type);
299 postcore_initcall(ibmebus_bus_init);