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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> | |
72328883 RM |
12 | #include <linux/pci.h> |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/amba/bus.h> | |
f85ff305 SR |
15 | |
16 | #include <asm/errno.h> | |
ced4eec9 | 17 | #include "of_private.h" |
f85ff305 | 18 | |
f85ff305 | 19 | /** |
44504b2b | 20 | * of_match_device - Tell if a struct device matches an of_device_id list |
f85ff305 SR |
21 | * @ids: array of of device match structures to search in |
22 | * @dev: the of device structure to match against | |
23 | * | |
2dc11581 | 24 | * Used by a driver to check whether an platform_device present in the |
f85ff305 SR |
25 | * system is in its list of supported devices. |
26 | */ | |
27 | const struct of_device_id *of_match_device(const struct of_device_id *matches, | |
44504b2b | 28 | const struct device *dev) |
f85ff305 | 29 | { |
8cec0e7b | 30 | if ((!matches) || (!dev->of_node)) |
f85ff305 | 31 | return NULL; |
44504b2b | 32 | return of_match_node(matches, dev->of_node); |
f85ff305 SR |
33 | } |
34 | EXPORT_SYMBOL(of_match_device); | |
35 | ||
94a0cb1f | 36 | struct platform_device *of_dev_get(struct platform_device *dev) |
f85ff305 SR |
37 | { |
38 | struct device *tmp; | |
39 | ||
40 | if (!dev) | |
41 | return NULL; | |
42 | tmp = get_device(&dev->dev); | |
43 | if (tmp) | |
94a0cb1f | 44 | return to_platform_device(tmp); |
f85ff305 SR |
45 | else |
46 | return NULL; | |
47 | } | |
48 | EXPORT_SYMBOL(of_dev_get); | |
49 | ||
94a0cb1f | 50 | void of_dev_put(struct platform_device *dev) |
f85ff305 SR |
51 | { |
52 | if (dev) | |
53 | put_device(&dev->dev); | |
54 | } | |
55 | EXPORT_SYMBOL(of_dev_put); | |
56 | ||
7096d042 | 57 | int of_device_add(struct platform_device *ofdev) |
f85ff305 | 58 | { |
61c7a080 | 59 | BUG_ON(ofdev->dev.of_node == NULL); |
6098e2ee | 60 | |
eca39301 GL |
61 | /* name and id have to be set so that the platform bus doesn't get |
62 | * confused on matching */ | |
63 | ofdev->name = dev_name(&ofdev->dev); | |
6d7e3bf8 | 64 | ofdev->id = PLATFORM_DEVID_NONE; |
eca39301 | 65 | |
56f2de81 ZL |
66 | /* |
67 | * If this device has not binding numa node in devicetree, that is | |
68 | * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this | |
69 | * device is on the same node as the parent. | |
70 | */ | |
71 | set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); | |
6098e2ee JK |
72 | |
73 | return device_add(&ofdev->dev); | |
f85ff305 | 74 | } |
7096d042 | 75 | |
1f5c69aa MK |
76 | /** |
77 | * of_dma_configure - Setup DMA configuration | |
78 | * @dev: Device to apply DMA configuration | |
79 | * @np: Pointer to OF node having DMA configuration | |
80 | * | |
81 | * Try to get devices's DMA configuration from DT and update it | |
82 | * accordingly. | |
83 | * | |
84 | * If platform code needs to use its own special DMA configuration, it | |
85 | * can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events | |
86 | * to fix up DMA configuration. | |
87 | */ | |
7b07cbef | 88 | int of_dma_configure(struct device *dev, struct device_node *np) |
1f5c69aa | 89 | { |
72328883 | 90 | u64 dma_addr, paddr, size = 0; |
1f5c69aa MK |
91 | int ret; |
92 | bool coherent; | |
93 | unsigned long offset; | |
53c92d79 | 94 | const struct iommu_ops *iommu; |
ee7b1f31 | 95 | u64 mask; |
1f5c69aa | 96 | |
1f5c69aa MK |
97 | ret = of_dma_get_range(np, &dma_addr, &paddr, &size); |
98 | if (ret < 0) { | |
72328883 RM |
99 | /* |
100 | * For legacy reasons, we have to assume some devices need | |
101 | * DMA configuration regardless of whether "dma-ranges" is | |
102 | * correctly specified or not. | |
103 | */ | |
104 | if (!dev_is_pci(dev) && | |
105 | #ifdef CONFIG_ARM_AMBA | |
106 | dev->bus != &amba_bustype && | |
107 | #endif | |
108 | dev->bus != &platform_bus_type) | |
109 | return ret == -ENODEV ? 0 : ret; | |
110 | ||
1f5c69aa | 111 | dma_addr = offset = 0; |
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 | ||
72328883 RM |
132 | /* |
133 | * Set default coherent_dma_mask to 32 bit. Drivers are expected to | |
134 | * setup the correct supported mask. | |
135 | */ | |
136 | if (!dev->coherent_dma_mask) | |
137 | dev->coherent_dma_mask = DMA_BIT_MASK(32); | |
138 | /* | |
139 | * Set it to coherent_dma_mask by default if the architecture | |
140 | * code has not set it. | |
141 | */ | |
142 | if (!dev->dma_mask) | |
143 | dev->dma_mask = &dev->coherent_dma_mask; | |
144 | ||
145 | if (!size) | |
146 | size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); | |
147 | ||
1f5c69aa MK |
148 | dev->dma_pfn_offset = offset; |
149 | ||
9a6d7298 MK |
150 | /* |
151 | * Limit coherent and dma mask based on size and default mask | |
152 | * set by the driver. | |
153 | */ | |
ee7b1f31 RM |
154 | mask = DMA_BIT_MASK(ilog2(dma_addr + size - 1) + 1); |
155 | dev->coherent_dma_mask &= mask; | |
156 | *dev->dma_mask &= mask; | |
9a6d7298 | 157 | |
1f5c69aa MK |
158 | coherent = of_dma_is_coherent(np); |
159 | dev_dbg(dev, "device is%sdma coherent\n", | |
160 | coherent ? " " : " not "); | |
161 | ||
162 | iommu = of_iommu_configure(dev, np); | |
a37b19a3 S |
163 | if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER) |
164 | return -EPROBE_DEFER; | |
7b07cbef | 165 | |
1f5c69aa MK |
166 | dev_dbg(dev, "device is%sbehind an iommu\n", |
167 | iommu ? " " : " not "); | |
168 | ||
169 | arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent); | |
7b07cbef LP |
170 | |
171 | return 0; | |
1f5c69aa MK |
172 | } |
173 | EXPORT_SYMBOL_GPL(of_dma_configure); | |
174 | ||
3f186677 LP |
175 | /** |
176 | * of_dma_deconfigure - Clean up DMA configuration | |
177 | * @dev: Device for which to clean up DMA configuration | |
178 | * | |
179 | * Clean up all configuration performed by of_dma_configure_ops() and free all | |
180 | * resources that have been allocated. | |
181 | */ | |
182 | void of_dma_deconfigure(struct device *dev) | |
183 | { | |
184 | arch_teardown_dma_ops(dev); | |
185 | } | |
186 | ||
7096d042 GL |
187 | int of_device_register(struct platform_device *pdev) |
188 | { | |
189 | device_initialize(&pdev->dev); | |
190 | return of_device_add(pdev); | |
191 | } | |
f85ff305 SR |
192 | EXPORT_SYMBOL(of_device_register); |
193 | ||
94a0cb1f | 194 | void of_device_unregister(struct platform_device *ofdev) |
f85ff305 | 195 | { |
f85ff305 SR |
196 | device_unregister(&ofdev->dev); |
197 | } | |
198 | EXPORT_SYMBOL(of_device_unregister); | |
09e67ca2 | 199 | |
3386e0fa JE |
200 | const void *of_device_get_match_data(const struct device *dev) |
201 | { | |
202 | const struct of_device_id *match; | |
203 | ||
204 | match = of_match_device(dev->driver->of_match_table, dev); | |
205 | if (!match) | |
206 | return NULL; | |
207 | ||
208 | return match->data; | |
209 | } | |
210 | EXPORT_SYMBOL(of_device_get_match_data); | |
211 | ||
0634c295 | 212 | static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len) |
09e67ca2 SR |
213 | { |
214 | const char *compat; | |
bc575064 RH |
215 | char *c; |
216 | struct property *p; | |
217 | ssize_t csize; | |
8c2a75e5 | 218 | ssize_t tsize; |
09e67ca2 | 219 | |
b9f73067 ZR |
220 | if ((!dev) || (!dev->of_node)) |
221 | return -ENODEV; | |
222 | ||
09e67ca2 | 223 | /* Name & Type */ |
34a1c1e8 GL |
224 | csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name, |
225 | dev->of_node->type); | |
8c2a75e5 | 226 | tsize = csize; |
bc575064 | 227 | len -= csize; |
8c2a75e5 BA |
228 | if (str) |
229 | str += csize; | |
bc575064 RH |
230 | |
231 | of_property_for_each_string(dev->of_node, "compatible", p, compat) { | |
8c2a75e5 BA |
232 | csize = strlen(compat) + 1; |
233 | tsize += csize; | |
234 | if (csize > len) | |
235 | continue; | |
bc575064 RH |
236 | |
237 | csize = snprintf(str, len, "C%s", compat); | |
238 | for (c = str; c; ) { | |
239 | c = strchr(c, ' '); | |
240 | if (c) | |
241 | *c++ = '_'; | |
242 | } | |
243 | len -= csize; | |
244 | str += csize; | |
09e67ca2 SR |
245 | } |
246 | ||
8c2a75e5 | 247 | return tsize; |
09e67ca2 | 248 | } |
dd27dcda | 249 | |
9c829c09 SB |
250 | int of_device_request_module(struct device *dev) |
251 | { | |
252 | char *str; | |
253 | ssize_t size; | |
254 | int ret; | |
255 | ||
256 | size = of_device_get_modalias(dev, NULL, 0); | |
257 | if (size < 0) | |
258 | return size; | |
259 | ||
260 | str = kmalloc(size + 1, GFP_KERNEL); | |
261 | if (!str) | |
262 | return -ENOMEM; | |
263 | ||
264 | of_device_get_modalias(dev, str, size); | |
265 | str[size] = '\0'; | |
266 | ret = request_module(str); | |
267 | kfree(str); | |
268 | ||
269 | return ret; | |
270 | } | |
271 | EXPORT_SYMBOL_GPL(of_device_request_module); | |
272 | ||
0634c295 RH |
273 | /** |
274 | * of_device_modalias - Fill buffer with newline terminated modalias string | |
275 | */ | |
276 | ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len) | |
277 | { | |
278 | ssize_t sl = of_device_get_modalias(dev, str, len - 2); | |
279 | if (sl < 0) | |
280 | return sl; | |
08ab58d9 BA |
281 | if (sl > len - 2) |
282 | return -ENOMEM; | |
0634c295 RH |
283 | |
284 | str[sl++] = '\n'; | |
285 | str[sl] = 0; | |
286 | return sl; | |
287 | } | |
288 | EXPORT_SYMBOL_GPL(of_device_modalias); | |
289 | ||
dd27dcda GL |
290 | /** |
291 | * of_device_uevent - Display OF related uevent information | |
292 | */ | |
07d57a32 | 293 | void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
dd27dcda GL |
294 | { |
295 | const char *compat; | |
ced4eec9 | 296 | struct alias_prop *app; |
bc575064 RH |
297 | struct property *p; |
298 | int seen = 0; | |
dd27dcda GL |
299 | |
300 | if ((!dev) || (!dev->of_node)) | |
07d57a32 | 301 | return; |
dd27dcda | 302 | |
07d57a32 | 303 | add_uevent_var(env, "OF_NAME=%s", dev->of_node->name); |
0d638a07 | 304 | add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node); |
07d57a32 GL |
305 | if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0) |
306 | add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type); | |
dd27dcda GL |
307 | |
308 | /* Since the compatible field can contain pretty much anything | |
309 | * it's not really legal to split it out with commas. We split it | |
310 | * up using a number of environment variables instead. */ | |
bc575064 | 311 | of_property_for_each_string(dev->of_node, "compatible", p, compat) { |
07d57a32 | 312 | add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat); |
dd27dcda GL |
313 | seen++; |
314 | } | |
07d57a32 | 315 | add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); |
ced4eec9 SM |
316 | |
317 | seen = 0; | |
c05aba2b | 318 | mutex_lock(&of_mutex); |
ced4eec9 SM |
319 | list_for_each_entry(app, &aliases_lookup, link) { |
320 | if (dev->of_node == app->np) { | |
321 | add_uevent_var(env, "OF_ALIAS_%d=%s", seen, | |
322 | app->alias); | |
323 | seen++; | |
324 | } | |
325 | } | |
c05aba2b | 326 | mutex_unlock(&of_mutex); |
07d57a32 | 327 | } |
dd27dcda | 328 | |
07d57a32 GL |
329 | int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) |
330 | { | |
331 | int sl; | |
332 | ||
333 | if ((!dev) || (!dev->of_node)) | |
334 | return -ENODEV; | |
dd27dcda | 335 | |
07d57a32 | 336 | /* Devicetree modalias is tricky, we add it in 2 steps */ |
dd27dcda GL |
337 | if (add_uevent_var(env, "MODALIAS=")) |
338 | return -ENOMEM; | |
339 | ||
34a1c1e8 | 340 | sl = of_device_get_modalias(dev, &env->buf[env->buflen-1], |
dd27dcda GL |
341 | sizeof(env->buf) - env->buflen); |
342 | if (sl >= (sizeof(env->buf) - env->buflen)) | |
343 | return -ENOMEM; | |
344 | env->buflen += sl; | |
345 | ||
346 | return 0; | |
347 | } | |
7a3b7cd3 | 348 | EXPORT_SYMBOL_GPL(of_device_uevent_modalias); |