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d7a30103 HS |
1 | /* |
2 | * IBM PowerPC IBM eBus Infrastructure Support. | |
3 | * | |
4 | * Copyright (c) 2005 IBM Corporation | |
6bccf755 | 5 | * Joachim Fenkes <fenkes@de.ibm.com> |
d7a30103 | 6 | * Heiko J Schick <schickhj@de.ibm.com> |
a8308800 | 7 | * |
d7a30103 HS |
8 | * All rights reserved. |
9 | * | |
a8308800 JF |
10 | * This source code is distributed under a dual license of GPL v2.0 and OpenIB |
11 | * BSD. | |
d7a30103 HS |
12 | * |
13 | * OpenIB BSD License | |
14 | * | |
a8308800 JF |
15 | * Redistribution and use in source and binary forms, with or without |
16 | * modification, are permitted provided that the following conditions are met: | |
d7a30103 | 17 | * |
a8308800 JF |
18 | * Redistributions of source code must retain the above copyright notice, this |
19 | * list of conditions and the following disclaimer. | |
d7a30103 | 20 | * |
a8308800 JF |
21 | * Redistributions in binary form must reproduce the above copyright notice, |
22 | * this list of conditions and the following disclaimer in the documentation | |
d7a30103 | 23 | * and/or other materials |
a8308800 | 24 | * provided with the distribution. |
d7a30103 | 25 | * |
a8308800 JF |
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 | |
d7a30103 HS |
32 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
33 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER | |
a8308800 JF |
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 | |
d7a30103 HS |
36 | * POSSIBILITY OF SUCH DAMAGE. |
37 | */ | |
38 | ||
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> | |
a988c0a6 | 44 | #include <linux/of_platform.h> |
d7a30103 HS |
45 | #include <asm/ibmebus.h> |
46 | #include <asm/abs_addr.h> | |
47 | ||
6bccf755 JF |
48 | static struct device ibmebus_bus_device = { /* fake "parent" device */ |
49 | .bus_id = "ibmebus", | |
d7a30103 HS |
50 | }; |
51 | ||
6bccf755 JF |
52 | struct bus_type ibmebus_bus_type; |
53 | ||
d7a30103 HS |
54 | static void *ibmebus_alloc_coherent(struct device *dev, |
55 | size_t size, | |
56 | dma_addr_t *dma_handle, | |
57 | gfp_t flag) | |
58 | { | |
59 | void *mem; | |
a8308800 | 60 | |
d7a30103 HS |
61 | mem = kmalloc(size, flag); |
62 | *dma_handle = (dma_addr_t)mem; | |
63 | ||
64 | return mem; | |
65 | } | |
66 | ||
67 | static void ibmebus_free_coherent(struct device *dev, | |
a8308800 | 68 | size_t size, void *vaddr, |
d7a30103 HS |
69 | dma_addr_t dma_handle) |
70 | { | |
71 | kfree(vaddr); | |
72 | } | |
73 | ||
74 | static dma_addr_t ibmebus_map_single(struct device *dev, | |
75 | void *ptr, | |
76 | size_t size, | |
77 | enum dma_data_direction direction) | |
78 | { | |
79 | return (dma_addr_t)(ptr); | |
80 | } | |
81 | ||
82 | static void ibmebus_unmap_single(struct device *dev, | |
83 | dma_addr_t dma_addr, | |
a8308800 | 84 | size_t size, |
d7a30103 HS |
85 | enum dma_data_direction direction) |
86 | { | |
87 | return; | |
88 | } | |
89 | ||
90 | static int ibmebus_map_sg(struct device *dev, | |
78bdc310 | 91 | struct scatterlist *sgl, |
d7a30103 HS |
92 | int nents, enum dma_data_direction direction) |
93 | { | |
78bdc310 | 94 | struct scatterlist *sg; |
d7a30103 | 95 | int i; |
a8308800 | 96 | |
78bdc310 JA |
97 | for_each_sg(sgl, sg, nents, i) { |
98 | sg->dma_address = (dma_addr_t)page_address(sg->page) | |
99 | + sg->offset; | |
100 | sg->dma_length = sg->length; | |
d7a30103 | 101 | } |
a8308800 | 102 | |
d7a30103 HS |
103 | return nents; |
104 | } | |
105 | ||
106 | static void ibmebus_unmap_sg(struct device *dev, | |
107 | struct scatterlist *sg, | |
108 | int nents, enum dma_data_direction direction) | |
109 | { | |
110 | return; | |
111 | } | |
112 | ||
113 | static int ibmebus_dma_supported(struct device *dev, u64 mask) | |
114 | { | |
115 | return 1; | |
116 | } | |
117 | ||
12d04eef | 118 | static struct dma_mapping_ops ibmebus_dma_ops = { |
d7a30103 HS |
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, | |
126 | }; | |
127 | ||
d7a30103 HS |
128 | int ibmebus_register_driver(struct ibmebus_driver *drv) |
129 | { | |
d7a30103 HS |
130 | return 0; |
131 | } | |
132 | EXPORT_SYMBOL(ibmebus_register_driver); | |
133 | ||
134 | void ibmebus_unregister_driver(struct ibmebus_driver *drv) | |
a8308800 | 135 | { |
d7a30103 HS |
136 | } |
137 | EXPORT_SYMBOL(ibmebus_unregister_driver); | |
138 | ||
139 | int ibmebus_request_irq(struct ibmebus_dev *dev, | |
a8308800 | 140 | u32 ist, |
40220c1a | 141 | irq_handler_t handler, |
d7a30103 HS |
142 | unsigned long irq_flags, const char * devname, |
143 | void *dev_id) | |
144 | { | |
6e99e458 | 145 | unsigned int irq = irq_create_mapping(NULL, ist); |
a8308800 | 146 | |
d7a30103 HS |
147 | if (irq == NO_IRQ) |
148 | return -EINVAL; | |
a8308800 | 149 | |
d7a30103 HS |
150 | return request_irq(irq, handler, |
151 | irq_flags, devname, dev_id); | |
152 | } | |
153 | EXPORT_SYMBOL(ibmebus_request_irq); | |
154 | ||
155 | void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id) | |
156 | { | |
0ebfff14 | 157 | unsigned int irq = irq_find_mapping(NULL, ist); |
a8308800 | 158 | |
d7a30103 | 159 | free_irq(irq, dev_id); |
d7a30103 HS |
160 | } |
161 | EXPORT_SYMBOL(ibmebus_free_irq); | |
162 | ||
6bccf755 JF |
163 | static ssize_t name_show(struct device *dev, |
164 | struct device_attribute *attr, char *buf) | |
165 | { | |
166 | struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev); | |
e2eb6392 | 167 | const char *name = of_get_property(ebus_dev->ofdev.node, "name", NULL); |
6bccf755 JF |
168 | return sprintf(buf, "%s\n", name); |
169 | } | |
170 | ||
171 | static struct device_attribute ibmebus_dev_attrs[] = { | |
172 | __ATTR_RO(name), | |
173 | __ATTR_NULL | |
174 | }; | |
175 | ||
0727702a | 176 | static int ibmebus_match_path(struct device *dev, void *data) |
6bccf755 | 177 | { |
0727702a JF |
178 | int rc; |
179 | struct device_node *dn = | |
180 | of_node_get(to_ibmebus_dev(dev)->ofdev.node); | |
6bccf755 | 181 | |
0727702a | 182 | rc = (dn->full_name && (strcasecmp((char*)data, dn->full_name) == 0)); |
6bccf755 | 183 | |
0727702a JF |
184 | of_node_put(dn); |
185 | return rc; | |
186 | } | |
6bccf755 | 187 | |
0727702a JF |
188 | static char *ibmebus_chomp(const char *in, size_t count) |
189 | { | |
61a564fd JJ |
190 | char *out = kmalloc(count + 1, GFP_KERNEL); |
191 | ||
0727702a JF |
192 | if (!out) |
193 | return NULL; | |
194 | ||
195 | memcpy(out, in, count); | |
196 | out[count] = '\0'; | |
197 | if (out[count - 1] == '\n') | |
198 | out[count - 1] = '\0'; | |
199 | ||
200 | return out; | |
6bccf755 JF |
201 | } |
202 | ||
203 | static ssize_t ibmebus_store_probe(struct bus_type *bus, | |
204 | const char *buf, size_t count) | |
205 | { | |
206 | struct device_node *dn = NULL; | |
207 | struct ibmebus_dev *dev; | |
0727702a JF |
208 | char *path; |
209 | ssize_t rc; | |
210 | ||
211 | path = ibmebus_chomp(buf, count); | |
212 | if (!path) | |
213 | return -ENOMEM; | |
214 | ||
215 | if (bus_find_device(&ibmebus_bus_type, NULL, path, | |
74c9b99d | 216 | ibmebus_match_path)) { |
0727702a JF |
217 | printk(KERN_WARNING "%s: %s has already been probed\n", |
218 | __FUNCTION__, path); | |
74c9b99d | 219 | rc = -EEXIST; |
0727702a | 220 | goto out; |
6bccf755 JF |
221 | } |
222 | ||
0727702a | 223 | if ((dn = of_find_node_by_path(path))) { |
a988c0a6 | 224 | /* dev = ibmebus_register_device_node(dn); */ |
0727702a JF |
225 | of_node_put(dn); |
226 | rc = IS_ERR(dev) ? PTR_ERR(dev) : count; | |
227 | } else { | |
228 | printk(KERN_WARNING "%s: no such device node: %s\n", | |
229 | __FUNCTION__, path); | |
230 | rc = -ENODEV; | |
6bccf755 JF |
231 | } |
232 | ||
0727702a JF |
233 | out: |
234 | kfree(path); | |
235 | return rc; | |
6bccf755 JF |
236 | } |
237 | ||
238 | static ssize_t ibmebus_store_remove(struct bus_type *bus, | |
239 | const char *buf, size_t count) | |
240 | { | |
241 | struct device *dev; | |
0727702a | 242 | char *path; |
6bccf755 | 243 | |
0727702a JF |
244 | path = ibmebus_chomp(buf, count); |
245 | if (!path) | |
246 | return -ENOMEM; | |
247 | ||
248 | if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, | |
249 | ibmebus_match_path))) { | |
a988c0a6 | 250 | /* ibmebus_unregister_device(dev); */ |
0727702a JF |
251 | |
252 | kfree(path); | |
253 | return count; | |
6bccf755 | 254 | } else { |
0727702a JF |
255 | printk(KERN_WARNING "%s: %s not on the bus\n", |
256 | __FUNCTION__, path); | |
257 | ||
258 | kfree(path); | |
6bccf755 JF |
259 | return -ENODEV; |
260 | } | |
6bccf755 JF |
261 | } |
262 | ||
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), | |
266 | __ATTR_NULL | |
267 | }; | |
268 | ||
d7a30103 | 269 | struct bus_type ibmebus_bus_type = { |
6bccf755 JF |
270 | .dev_attrs = ibmebus_dev_attrs, |
271 | .bus_attrs = ibmebus_bus_attrs | |
d7a30103 HS |
272 | }; |
273 | EXPORT_SYMBOL(ibmebus_bus_type); | |
274 | ||
275 | static int __init ibmebus_bus_init(void) | |
276 | { | |
277 | int err; | |
a8308800 | 278 | |
d7a30103 | 279 | printk(KERN_INFO "IBM eBus Device Driver\n"); |
a8308800 | 280 | |
a988c0a6 | 281 | err = of_bus_type_init(&ibmebus_bus_type, "ibmebus"); |
d7a30103 | 282 | if (err) { |
a988c0a6 | 283 | printk(KERN_ERR "%s: failed to register IBM eBus.\n", |
d7a30103 HS |
284 | __FUNCTION__); |
285 | return err; | |
286 | } | |
a8308800 | 287 | |
6bccf755 | 288 | err = device_register(&ibmebus_bus_device); |
d7a30103 | 289 | if (err) { |
a8308800 | 290 | printk(KERN_WARNING "%s: device_register returned %i\n", |
d7a30103 HS |
291 | __FUNCTION__, err); |
292 | bus_unregister(&ibmebus_bus_type); | |
293 | ||
294 | return err; | |
295 | } | |
a8308800 | 296 | |
d7a30103 HS |
297 | return 0; |
298 | } | |
a988c0a6 | 299 | postcore_initcall(ibmebus_bus_init); |