1
2#include <linux/string.h>
3#include <linux/kernel.h>
4#include <linux/of.h>
5#include <linux/of_device.h>
6#include <linux/of_address.h>
7#include <linux/of_iommu.h>
8#include <linux/dma-mapping.h>
9#include <linux/init.h>
10#include <linux/module.h>
11#include <linux/mod_devicetable.h>
12#include <linux/slab.h>
13#include <linux/platform_device.h>
14
15#include <asm/errno.h>
16#include "of_private.h"
17
18
19
20
21
22
23
24
25
26const struct of_device_id *of_match_device(const struct of_device_id *matches,
27 const struct device *dev)
28{
29 if ((!matches) || (!dev->of_node))
30 return NULL;
31 return of_match_node(matches, dev->of_node);
32}
33EXPORT_SYMBOL(of_match_device);
34
35struct platform_device *of_dev_get(struct platform_device *dev)
36{
37 struct device *tmp;
38
39 if (!dev)
40 return NULL;
41 tmp = get_device(&dev->dev);
42 if (tmp)
43 return to_platform_device(tmp);
44 else
45 return NULL;
46}
47EXPORT_SYMBOL(of_dev_get);
48
49void of_dev_put(struct platform_device *dev)
50{
51 if (dev)
52 put_device(&dev->dev);
53}
54EXPORT_SYMBOL(of_dev_put);
55
56int of_device_add(struct platform_device *ofdev)
57{
58 BUG_ON(ofdev->dev.of_node == NULL);
59
60
61
62 ofdev->name = dev_name(&ofdev->dev);
63 ofdev->id = PLATFORM_DEVID_NONE;
64
65
66
67
68
69
70 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));
71
72 return device_add(&ofdev->dev);
73}
74
75
76
77
78
79
80
81
82
83
84
85
86
87int of_dma_configure(struct device *dev, struct device_node *np)
88{
89 u64 dma_addr, paddr, size = 0;
90 int ret;
91 bool coherent;
92 unsigned long offset;
93 const struct iommu_ops *iommu;
94 u64 mask;
95
96 ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
97 if (ret < 0) {
98
99
100
101
102
103 if (!dev->bus->force_dma)
104 return ret == -ENODEV ? 0 : ret;
105
106 dma_addr = offset = 0;
107 } else {
108 offset = PFN_DOWN(paddr - dma_addr);
109
110
111
112
113
114 if (size & 1) {
115 dev_warn(dev, "Invalid size 0x%llx for dma-range\n",
116 size);
117 size = size + 1;
118 }
119
120 if (!size) {
121 dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
122 return -EINVAL;
123 }
124 dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
125 }
126
127
128
129
130
131 if (!dev->coherent_dma_mask)
132 dev->coherent_dma_mask = DMA_BIT_MASK(32);
133
134
135
136
137 if (!dev->dma_mask)
138 dev->dma_mask = &dev->coherent_dma_mask;
139
140 if (!size)
141 size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
142
143 dev->dma_pfn_offset = offset;
144
145
146
147
148
149 mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1);
150 dev->coherent_dma_mask &= mask;
151 *dev->dma_mask &= mask;
152
153 coherent = of_dma_is_coherent(np);
154 dev_dbg(dev, "device is%sdma coherent\n",
155 coherent ? " " : " not ");
156
157 iommu = of_iommu_configure(dev, np);
158 if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
159 return -EPROBE_DEFER;
160
161 dev_dbg(dev, "device is%sbehind an iommu\n",
162 iommu ? " " : " not ");
163
164 arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);
165
166 return 0;
167}
168EXPORT_SYMBOL_GPL(of_dma_configure);
169
170
171
172
173
174
175
176
177void of_dma_deconfigure(struct device *dev)
178{
179 arch_teardown_dma_ops(dev);
180}
181
182int of_device_register(struct platform_device *pdev)
183{
184 device_initialize(&pdev->dev);
185 return of_device_add(pdev);
186}
187EXPORT_SYMBOL(of_device_register);
188
189void of_device_unregister(struct platform_device *ofdev)
190{
191 device_unregister(&ofdev->dev);
192}
193EXPORT_SYMBOL(of_device_unregister);
194
195const void *of_device_get_match_data(const struct device *dev)
196{
197 const struct of_device_id *match;
198
199 match = of_match_device(dev->driver->of_match_table, dev);
200 if (!match)
201 return NULL;
202
203 return match->data;
204}
205EXPORT_SYMBOL(of_device_get_match_data);
206
207static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
208{
209 const char *compat;
210 char *c;
211 struct property *p;
212 ssize_t csize;
213 ssize_t tsize;
214
215 if ((!dev) || (!dev->of_node))
216 return -ENODEV;
217
218
219 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,
220 dev->of_node->type);
221 tsize = csize;
222 len -= csize;
223 if (str)
224 str += csize;
225
226 of_property_for_each_string(dev->of_node, "compatible", p, compat) {
227 csize = strlen(compat) + 1;
228 tsize += csize;
229 if (csize > len)
230 continue;
231
232 csize = snprintf(str, len, "C%s", compat);
233 for (c = str; c; ) {
234 c = strchr(c, ' ');
235 if (c)
236 *c++ = '_';
237 }
238 len -= csize;
239 str += csize;
240 }
241
242 return tsize;
243}
244
245int of_device_request_module(struct device *dev)
246{
247 char *str;
248 ssize_t size;
249 int ret;
250
251 size = of_device_get_modalias(dev, NULL, 0);
252 if (size < 0)
253 return size;
254
255 str = kmalloc(size + 1, GFP_KERNEL);
256 if (!str)
257 return -ENOMEM;
258
259 of_device_get_modalias(dev, str, size);
260 str[size] = '\0';
261 ret = request_module(str);
262 kfree(str);
263
264 return ret;
265}
266EXPORT_SYMBOL_GPL(of_device_request_module);
267
268
269
270
271ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
272{
273 ssize_t sl = of_device_get_modalias(dev, str, len - 2);
274 if (sl < 0)
275 return sl;
276 if (sl > len - 2)
277 return -ENOMEM;
278
279 str[sl++] = '\n';
280 str[sl] = 0;
281 return sl;
282}
283EXPORT_SYMBOL_GPL(of_device_modalias);
284
285
286
287
288void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
289{
290 const char *compat;
291 struct alias_prop *app;
292 struct property *p;
293 int seen = 0;
294
295 if ((!dev) || (!dev->of_node))
296 return;
297
298 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
299 add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node);
300 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
301 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);
302
303
304
305
306 of_property_for_each_string(dev->of_node, "compatible", p, compat) {
307 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
308 seen++;
309 }
310 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);
311
312 seen = 0;
313 mutex_lock(&of_mutex);
314 list_for_each_entry(app, &aliases_lookup, link) {
315 if (dev->of_node == app->np) {
316 add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
317 app->alias);
318 seen++;
319 }
320 }
321 mutex_unlock(&of_mutex);
322}
323
324int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
325{
326 int sl;
327
328 if ((!dev) || (!dev->of_node))
329 return -ENODEV;
330
331
332 if (add_uevent_var(env, "MODALIAS="))
333 return -ENOMEM;
334
335 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],
336 sizeof(env->buf) - env->buflen);
337 if (sl >= (sizeof(env->buf) - env->buflen))
338 return -ENOMEM;
339 env->buflen += sl;
340
341 return 0;
342}
343EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
344