2 * IBM PowerPC IBM eBus Infrastructure Support.
4 * Copyright (c) 2005 IBM Corporation
5 * Heiko J Schick <schickhj@de.ibm.com>
9 * This source code is distributed under a dual license of GPL v2.0 and OpenIB
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are met:
17 * Redistributions of source code must retain the above copyright notice, this
18 * list of conditions and the following disclaimer.
20 * Redistributions in binary form must reproduce the above copyright notice,
21 * this list of conditions and the following disclaimer in the documentation
22 * and/or other materials
23 * provided with the distribution.
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
32 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
33 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
38 #include <linux/init.h>
39 #include <linux/console.h>
40 #include <linux/kobject.h>
41 #include <linux/dma-mapping.h>
42 #include <linux/interrupt.h>
43 #include <asm/ibmebus.h>
44 #include <asm/abs_addr.h>
46 static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */
47 .name = ibmebus_bus_device.ofdev.dev.bus_id,
48 .ofdev.dev.bus_id = "ibmebus",
49 .ofdev.dev.bus = &ibmebus_bus_type,
52 static void *ibmebus_alloc_coherent(struct device *dev,
54 dma_addr_t *dma_handle,
59 mem = kmalloc(size, flag);
60 *dma_handle = (dma_addr_t)mem;
65 static void ibmebus_free_coherent(struct device *dev,
66 size_t size, void *vaddr,
67 dma_addr_t dma_handle)
72 static dma_addr_t ibmebus_map_single(struct device *dev,
75 enum dma_data_direction direction)
77 return (dma_addr_t)(ptr);
80 static void ibmebus_unmap_single(struct device *dev,
83 enum dma_data_direction direction)
88 static int ibmebus_map_sg(struct device *dev,
89 struct scatterlist *sg,
90 int nents, enum dma_data_direction direction)
94 for (i = 0; i < nents; i++) {
95 sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
97 sg[i].dma_length = sg[i].length;
103 static void ibmebus_unmap_sg(struct device *dev,
104 struct scatterlist *sg,
105 int nents, enum dma_data_direction direction)
110 static int ibmebus_dma_supported(struct device *dev, u64 mask)
115 struct dma_mapping_ops ibmebus_dma_ops = {
116 .alloc_coherent = ibmebus_alloc_coherent,
117 .free_coherent = ibmebus_free_coherent,
118 .map_single = ibmebus_map_single,
119 .unmap_single = ibmebus_unmap_single,
120 .map_sg = ibmebus_map_sg,
121 .unmap_sg = ibmebus_unmap_sg,
122 .dma_supported = ibmebus_dma_supported,
125 static int ibmebus_bus_probe(struct device *dev)
127 struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
128 struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
129 const struct of_device_id *id;
132 if (!ibmebusdrv->probe)
135 id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
137 error = ibmebusdrv->probe(ibmebusdev, id);
143 static int ibmebus_bus_remove(struct device *dev)
145 struct ibmebus_dev *ibmebusdev = to_ibmebus_dev(dev);
146 struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
148 if (ibmebusdrv->remove) {
149 return ibmebusdrv->remove(ibmebusdev);
155 static void __devinit ibmebus_dev_release(struct device *dev)
157 of_node_put(to_ibmebus_dev(dev)->ofdev.node);
158 kfree(to_ibmebus_dev(dev));
161 static ssize_t ibmebusdev_show_name(struct device *dev,
162 struct device_attribute *attr, char *buf)
164 return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name);
166 static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name,
169 static struct ibmebus_dev* __devinit ibmebus_register_device_common(
170 struct ibmebus_dev *dev, char *name)
175 dev->ofdev.dev.parent = &ibmebus_bus_device.ofdev.dev;
176 dev->ofdev.dev.bus = &ibmebus_bus_type;
177 dev->ofdev.dev.release = ibmebus_dev_release;
179 /* An ibmebusdev is based on a of_device. We have to change the
180 * bus type to use our own DMA mapping operations.
182 if ((err = of_device_register(&dev->ofdev)) != 0) {
183 printk(KERN_ERR "%s: failed to register device (%d).\n",
188 device_create_file(&dev->ofdev.dev, &dev_attr_name);
193 static struct ibmebus_dev* __devinit ibmebus_register_device_node(
194 struct device_node *dn)
196 struct ibmebus_dev *dev;
200 loc_code = (char *)get_property(dn, "ibm,loc-code", NULL);
202 printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
203 __FUNCTION__, dn->name ? dn->name : "<unknown>");
207 if (strlen(loc_code) == 0) {
208 printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
213 dev = kmalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
217 memset(dev, 0, sizeof(struct ibmebus_dev));
219 dev->ofdev.node = of_node_get(dn);
221 length = strlen(loc_code);
222 memcpy(dev->ofdev.dev.bus_id, loc_code
223 + (length - min(length, BUS_ID_SIZE - 1)),
224 min(length, BUS_ID_SIZE - 1));
226 /* Register with generic device framework. */
227 if (ibmebus_register_device_common(dev, dn->name) == NULL) {
235 static void ibmebus_probe_of_nodes(char* name)
237 struct device_node *dn = NULL;
239 while ((dn = of_find_node_by_name(dn, name))) {
240 if (ibmebus_register_device_node(dn) == NULL) {
252 static void ibmebus_add_devices_by_id(struct of_device_id *idt)
254 while (strlen(idt->name) > 0) {
255 ibmebus_probe_of_nodes(idt->name);
262 static int ibmebus_match_helper(struct device *dev, void *data)
264 if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0)
270 static int ibmebus_unregister_device(struct device *dev)
272 device_remove_file(dev, &dev_attr_name);
273 of_device_unregister(to_of_device(dev));
278 static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
282 while (strlen(idt->name) > 0) {
283 while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
285 ibmebus_match_helper))) {
286 ibmebus_unregister_device(dev);
295 int ibmebus_register_driver(struct ibmebus_driver *drv)
299 drv->driver.name = drv->name;
300 drv->driver.bus = &ibmebus_bus_type;
301 drv->driver.probe = ibmebus_bus_probe;
302 drv->driver.remove = ibmebus_bus_remove;
304 if ((err = driver_register(&drv->driver) != 0))
307 ibmebus_add_devices_by_id(drv->id_table);
311 EXPORT_SYMBOL(ibmebus_register_driver);
313 void ibmebus_unregister_driver(struct ibmebus_driver *drv)
315 driver_unregister(&drv->driver);
316 ibmebus_remove_devices_by_id(drv->id_table);
318 EXPORT_SYMBOL(ibmebus_unregister_driver);
320 int ibmebus_request_irq(struct ibmebus_dev *dev,
322 irqreturn_t (*handler)(int, void*, struct pt_regs *),
323 unsigned long irq_flags, const char * devname,
326 unsigned int irq = irq_create_mapping(NULL, ist);
331 return request_irq(irq, handler,
332 irq_flags, devname, dev_id);
334 EXPORT_SYMBOL(ibmebus_request_irq);
336 void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
338 unsigned int irq = irq_find_mapping(NULL, ist);
340 free_irq(irq, dev_id);
342 EXPORT_SYMBOL(ibmebus_free_irq);
344 static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
346 const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
347 struct ibmebus_driver *ebus_drv = to_ibmebus_driver(drv);
348 const struct of_device_id *ids = ebus_drv->id_table;
349 const struct of_device_id *found_id;
354 found_id = of_match_device(ids, &ebus_dev->ofdev);
361 struct bus_type ibmebus_bus_type = {
363 .match = ibmebus_bus_match,
365 EXPORT_SYMBOL(ibmebus_bus_type);
367 static int __init ibmebus_bus_init(void)
371 printk(KERN_INFO "IBM eBus Device Driver\n");
373 err = bus_register(&ibmebus_bus_type);
375 printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
380 err = device_register(&ibmebus_bus_device.ofdev.dev);
382 printk(KERN_WARNING "%s: device_register returned %i\n",
384 bus_unregister(&ibmebus_bus_type);
391 __initcall(ibmebus_bus_init);