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f85ff305 SR |
1 | #include <linux/string.h> |
2 | #include <linux/kernel.h> | |
3 | #include <linux/of.h> | |
f898f8db | 4 | #include <linux/of_device.h> |
1f5c69aa MK |
5 | #include <linux/of_address.h> |
6 | #include <linux/of_iommu.h> | |
7 | #include <linux/dma-mapping.h> | |
f85ff305 SR |
8 | #include <linux/init.h> |
9 | #include <linux/module.h> | |
10 | #include <linux/mod_devicetable.h> | |
11 | #include <linux/slab.h> | |
12 | ||
13 | #include <asm/errno.h> | |
ced4eec9 | 14 | #include "of_private.h" |
f85ff305 | 15 | |
f85ff305 | 16 | /** |
44504b2b | 17 | * of_match_device - Tell if a struct device matches an of_device_id list |
f85ff305 SR |
18 | * @ids: array of of device match structures to search in |
19 | * @dev: the of device structure to match against | |
20 | * | |
2dc11581 | 21 | * Used by a driver to check whether an platform_device present in the |
f85ff305 SR |
22 | * system is in its list of supported devices. |
23 | */ | |
24 | const struct of_device_id *of_match_device(const struct of_device_id *matches, | |
44504b2b | 25 | const struct device *dev) |
f85ff305 | 26 | { |
8cec0e7b | 27 | if ((!matches) || (!dev->of_node)) |
f85ff305 | 28 | return NULL; |
44504b2b | 29 | return of_match_node(matches, dev->of_node); |
f85ff305 SR |
30 | } |
31 | EXPORT_SYMBOL(of_match_device); | |
32 | ||
94a0cb1f | 33 | struct platform_device *of_dev_get(struct platform_device *dev) |
f85ff305 SR |
34 | { |
35 | struct device *tmp; | |
36 | ||
37 | if (!dev) | |
38 | return NULL; | |
39 | tmp = get_device(&dev->dev); | |
40 | if (tmp) | |
94a0cb1f | 41 | return to_platform_device(tmp); |
f85ff305 SR |
42 | else |
43 | return NULL; | |
44 | } | |
45 | EXPORT_SYMBOL(of_dev_get); | |
46 | ||
94a0cb1f | 47 | void of_dev_put(struct platform_device *dev) |
f85ff305 SR |
48 | { |
49 | if (dev) | |
50 | put_device(&dev->dev); | |
51 | } | |
52 | EXPORT_SYMBOL(of_dev_put); | |
53 | ||
7096d042 | 54 | int of_device_add(struct platform_device *ofdev) |
f85ff305 | 55 | { |
61c7a080 | 56 | BUG_ON(ofdev->dev.of_node == NULL); |
6098e2ee | 57 | |
eca39301 GL |
58 | /* name and id have to be set so that the platform bus doesn't get |
59 | * confused on matching */ | |
60 | ofdev->name = dev_name(&ofdev->dev); | |
61 | ofdev->id = -1; | |
62 | ||
56f2de81 ZL |
63 | /* |
64 | * If this device has not binding numa node in devicetree, that is | |
65 | * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this | |
66 | * device is on the same node as the parent. | |
67 | */ | |
68 | set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); | |
6098e2ee JK |
69 | |
70 | return device_add(&ofdev->dev); | |
f85ff305 | 71 | } |
7096d042 | 72 | |
1f5c69aa MK |
73 | /** |
74 | * of_dma_configure - Setup DMA configuration | |
75 | * @dev: Device to apply DMA configuration | |
76 | * @np: Pointer to OF node having DMA configuration | |
77 | * | |
78 | * Try to get devices's DMA configuration from DT and update it | |
79 | * accordingly. | |
80 | * | |
81 | * If platform code needs to use its own special DMA configuration, it | |
82 | * can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events | |
83 | * to fix up DMA configuration. | |
84 | */ | |
7b07cbef | 85 | int of_dma_configure(struct device *dev, struct device_node *np) |
1f5c69aa MK |
86 | { |
87 | u64 dma_addr, paddr, size; | |
88 | int ret; | |
89 | bool coherent; | |
90 | unsigned long offset; | |
53c92d79 | 91 | const struct iommu_ops *iommu; |
ee7b1f31 | 92 | u64 mask; |
1f5c69aa MK |
93 | |
94 | /* | |
9a6d7298 MK |
95 | * Set default coherent_dma_mask to 32 bit. Drivers are expected to |
96 | * setup the correct supported mask. | |
1f5c69aa | 97 | */ |
9a6d7298 MK |
98 | if (!dev->coherent_dma_mask) |
99 | dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
1f5c69aa MK |
100 | |
101 | /* | |
102 | * Set it to coherent_dma_mask by default if the architecture | |
103 | * code has not set it. | |
104 | */ | |
105 | if (!dev->dma_mask) | |
106 | dev->dma_mask = &dev->coherent_dma_mask; | |
107 | ||
108 | ret = of_dma_get_range(np, &dma_addr, &paddr, &size); | |
109 | if (ret < 0) { | |
110 | dma_addr = offset = 0; | |
efc8551a | 111 | size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); |
1f5c69aa MK |
112 | } else { |
113 | offset = PFN_DOWN(paddr - dma_addr); | |
0c79c81c MK |
114 | |
115 | /* | |
116 | * Add a work around to treat the size as mask + 1 in case | |
117 | * it is defined in DT as a mask. | |
118 | */ | |
119 | if (size & 1) { | |
120 | dev_warn(dev, "Invalid size 0x%llx for dma-range\n", | |
121 | size); | |
122 | size = size + 1; | |
123 | } | |
124 | ||
125 | if (!size) { | |
126 | dev_err(dev, "Adjusted size 0x%llx invalid\n", size); | |
7b07cbef | 127 | return -EINVAL; |
0c79c81c | 128 | } |
1f5c69aa MK |
129 | dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset); |
130 | } | |
131 | ||
132 | dev->dma_pfn_offset = offset; | |
133 | ||
9a6d7298 MK |
134 | /* |
135 | * Limit coherent and dma mask based on size and default mask | |
136 | * set by the driver. | |
137 | */ | |
ee7b1f31 RM |
138 | mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1); |
139 | dev->coherent_dma_mask &= mask; | |
140 | *dev->dma_mask &= mask; | |
9a6d7298 | 141 | |
1f5c69aa MK |
142 | coherent = of_dma_is_coherent(np); |
143 | dev_dbg(dev, "device is%sdma coherent\n", | |
144 | coherent ? " " : " not "); | |
145 | ||
146 | iommu = of_iommu_configure(dev, np); | |
a37b19a3 S |
147 | if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER) |
148 | return -EPROBE_DEFER; | |
7b07cbef | 149 | |
1f5c69aa MK |
150 | dev_dbg(dev, "device is%sbehind an iommu\n", |
151 | iommu ? " " : " not "); | |
152 | ||
153 | arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent); | |
7b07cbef LP |
154 | |
155 | return 0; | |
1f5c69aa MK |
156 | } |
157 | EXPORT_SYMBOL_GPL(of_dma_configure); | |
158 | ||
3f186677 LP |
159 | /** |
160 | * of_dma_deconfigure - Clean up DMA configuration | |
161 | * @dev: Device for which to clean up DMA configuration | |
162 | * | |
163 | * Clean up all configuration performed by of_dma_configure_ops() and free all | |
164 | * resources that have been allocated. | |
165 | */ | |
166 | void of_dma_deconfigure(struct device *dev) | |
167 | { | |
168 | arch_teardown_dma_ops(dev); | |
169 | } | |
170 | ||
7096d042 GL |
171 | int of_device_register(struct platform_device *pdev) |
172 | { | |
173 | device_initialize(&pdev->dev); | |
174 | return of_device_add(pdev); | |
175 | } | |
f85ff305 SR |
176 | EXPORT_SYMBOL(of_device_register); |
177 | ||
94a0cb1f | 178 | void of_device_unregister(struct platform_device *ofdev) |
f85ff305 | 179 | { |
f85ff305 SR |
180 | device_unregister(&ofdev->dev); |
181 | } | |
182 | EXPORT_SYMBOL(of_device_unregister); | |
09e67ca2 | 183 | |
3386e0fa JE |
184 | const void *of_device_get_match_data(const struct device *dev) |
185 | { | |
186 | const struct of_device_id *match; | |
187 | ||
188 | match = of_match_device(dev->driver->of_match_table, dev); | |
189 | if (!match) | |
190 | return NULL; | |
191 | ||
192 | return match->data; | |
193 | } | |
194 | EXPORT_SYMBOL(of_device_get_match_data); | |
195 | ||
0634c295 | 196 | static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len) |
09e67ca2 SR |
197 | { |
198 | const char *compat; | |
199 | int cplen, i; | |
200 | ssize_t tsize, csize, repend; | |
201 | ||
b9f73067 ZR |
202 | if ((!dev) || (!dev->of_node)) |
203 | return -ENODEV; | |
204 | ||
09e67ca2 | 205 | /* Name & Type */ |
34a1c1e8 GL |
206 | csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name, |
207 | dev->of_node->type); | |
09e67ca2 SR |
208 | |
209 | /* Get compatible property if any */ | |
34a1c1e8 | 210 | compat = of_get_property(dev->of_node, "compatible", &cplen); |
09e67ca2 SR |
211 | if (!compat) |
212 | return csize; | |
213 | ||
214 | /* Find true end (we tolerate multiple \0 at the end */ | |
215 | for (i = (cplen - 1); i >= 0 && !compat[i]; i--) | |
216 | cplen--; | |
217 | if (!cplen) | |
218 | return csize; | |
219 | cplen++; | |
220 | ||
221 | /* Check space (need cplen+1 chars including final \0) */ | |
222 | tsize = csize + cplen; | |
223 | repend = tsize; | |
224 | ||
225 | if (csize >= len) /* @ the limit, all is already filled */ | |
226 | return tsize; | |
227 | ||
228 | if (tsize >= len) { /* limit compat list */ | |
229 | cplen = len - csize - 1; | |
230 | repend = len; | |
231 | } | |
232 | ||
233 | /* Copy and do char replacement */ | |
234 | memcpy(&str[csize + 1], compat, cplen); | |
235 | for (i = csize; i < repend; i++) { | |
236 | char c = str[i]; | |
237 | if (c == '\0') | |
238 | str[i] = 'C'; | |
239 | else if (c == ' ') | |
240 | str[i] = '_'; | |
241 | } | |
242 | ||
bcf54d53 | 243 | return repend; |
09e67ca2 | 244 | } |
dd27dcda | 245 | |
9c829c09 SB |
246 | int of_device_request_module(struct device *dev) |
247 | { | |
248 | char *str; | |
249 | ssize_t size; | |
250 | int ret; | |
251 | ||
252 | size = of_device_get_modalias(dev, NULL, 0); | |
253 | if (size < 0) | |
254 | return size; | |
255 | ||
256 | str = kmalloc(size + 1, GFP_KERNEL); | |
257 | if (!str) | |
258 | return -ENOMEM; | |
259 | ||
260 | of_device_get_modalias(dev, str, size); | |
261 | str[size] = '\0'; | |
262 | ret = request_module(str); | |
263 | kfree(str); | |
264 | ||
265 | return ret; | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(of_device_request_module); | |
268 | ||
0634c295 RH |
269 | /** |
270 | * of_device_modalias - Fill buffer with newline terminated modalias string | |
271 | */ | |
272 | ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len) | |
273 | { | |
274 | ssize_t sl = of_device_get_modalias(dev, str, len - 2); | |
275 | if (sl < 0) | |
276 | return sl; | |
b6af0800 BA |
277 | if (sl > len - 2) |
278 | return -ENOMEM; | |
0634c295 RH |
279 | |
280 | str[sl++] = '\n'; | |
281 | str[sl] = 0; | |
282 | return sl; | |
283 | } | |
284 | EXPORT_SYMBOL_GPL(of_device_modalias); | |
285 | ||
dd27dcda GL |
286 | /** |
287 | * of_device_uevent - Display OF related uevent information | |
288 | */ | |
07d57a32 | 289 | void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
dd27dcda GL |
290 | { |
291 | const char *compat; | |
ced4eec9 | 292 | struct alias_prop *app; |
dd27dcda GL |
293 | int seen = 0, cplen, sl; |
294 | ||
295 | if ((!dev) || (!dev->of_node)) | |
07d57a32 | 296 | return; |
dd27dcda | 297 | |
07d57a32 GL |
298 | add_uevent_var(env, "OF_NAME=%s", dev->of_node->name); |
299 | add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name); | |
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); | |
dd27dcda GL |
302 | |
303 | /* Since the compatible field can contain pretty much anything | |
304 | * it's not really legal to split it out with commas. We split it | |
305 | * up using a number of environment variables instead. */ | |
dd27dcda GL |
306 | compat = of_get_property(dev->of_node, "compatible", &cplen); |
307 | while (compat && *compat && cplen > 0) { | |
07d57a32 | 308 | add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat); |
dd27dcda GL |
309 | sl = strlen(compat) + 1; |
310 | compat += sl; | |
311 | cplen -= sl; | |
312 | seen++; | |
313 | } | |
07d57a32 | 314 | add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); |
ced4eec9 SM |
315 | |
316 | seen = 0; | |
c05aba2b | 317 | mutex_lock(&of_mutex); |
ced4eec9 SM |
318 | list_for_each_entry(app, &aliases_lookup, link) { |
319 | if (dev->of_node == app->np) { | |
320 | add_uevent_var(env, "OF_ALIAS_%d=%s", seen, | |
321 | app->alias); | |
322 | seen++; | |
323 | } | |
324 | } | |
c05aba2b | 325 | mutex_unlock(&of_mutex); |
07d57a32 | 326 | } |
dd27dcda | 327 | |
07d57a32 GL |
328 | int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) |
329 | { | |
330 | int sl; | |
331 | ||
332 | if ((!dev) || (!dev->of_node)) | |
333 | return -ENODEV; | |
dd27dcda | 334 | |
07d57a32 | 335 | /* Devicetree modalias is tricky, we add it in 2 steps */ |
dd27dcda GL |
336 | if (add_uevent_var(env, "MODALIAS=")) |
337 | return -ENOMEM; | |
338 | ||
34a1c1e8 | 339 | sl = of_device_get_modalias(dev, &env->buf[env->buflen-1], |
dd27dcda GL |
340 | sizeof(env->buf) - env->buflen); |
341 | if (sl >= (sizeof(env->buf) - env->buflen)) | |
342 | return -ENOMEM; | |
343 | env->buflen += sl; | |
344 | ||
345 | return 0; | |
346 | } | |
7a3b7cd3 | 347 | EXPORT_SYMBOL_GPL(of_device_uevent_modalias); |