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3f23de10 SR |
1 | /* |
2 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. | |
3 | * <benh@kernel.crashing.org> | |
4 | * and Arnd Bergmann, IBM Corp. | |
5 | * Merged from powerpc/kernel/of_platform.c and | |
6 | * sparc{,64}/kernel/of_device.c by Stephen Rothwell | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | */ | |
14 | #include <linux/errno.h> | |
5c457083 | 15 | #include <linux/module.h> |
5de1540b | 16 | #include <linux/amba/bus.h> |
3f23de10 | 17 | #include <linux/device.h> |
5fd200f3 | 18 | #include <linux/dma-mapping.h> |
50ef5284 | 19 | #include <linux/slab.h> |
9e3288dc | 20 | #include <linux/of_address.h> |
3f23de10 | 21 | #include <linux/of_device.h> |
9e3288dc | 22 | #include <linux/of_irq.h> |
3f23de10 | 23 | #include <linux/of_platform.h> |
eca39301 GL |
24 | #include <linux/platform_device.h> |
25 | ||
cbb49c26 GL |
26 | const struct of_device_id of_default_bus_match_table[] = { |
27 | { .compatible = "simple-bus", }, | |
28 | #ifdef CONFIG_ARM_AMBA | |
29 | { .compatible = "arm,amba-bus", }, | |
30 | #endif /* CONFIG_ARM_AMBA */ | |
31 | {} /* Empty terminated list */ | |
32 | }; | |
33 | ||
c6085584 JB |
34 | static int of_dev_node_match(struct device *dev, void *data) |
35 | { | |
36 | return dev->of_node == data; | |
37 | } | |
38 | ||
39 | /** | |
40 | * of_find_device_by_node - Find the platform_device associated with a node | |
41 | * @np: Pointer to device tree node | |
42 | * | |
43 | * Returns platform_device pointer, or NULL if not found | |
44 | */ | |
45 | struct platform_device *of_find_device_by_node(struct device_node *np) | |
46 | { | |
47 | struct device *dev; | |
48 | ||
49 | dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match); | |
50 | return dev ? to_platform_device(dev) : NULL; | |
51 | } | |
52 | EXPORT_SYMBOL(of_find_device_by_node); | |
53 | ||
596c955c GL |
54 | #if defined(CONFIG_PPC_DCR) |
55 | #include <asm/dcr.h> | |
56 | #endif | |
57 | ||
964dba28 | 58 | #ifdef CONFIG_OF_ADDRESS |
5fd200f3 GL |
59 | /* |
60 | * The following routines scan a subtree and registers a device for | |
61 | * each applicable node. | |
62 | * | |
63 | * Note: sparc doesn't use these routines because it has a different | |
64 | * mechanism for creating devices from device tree nodes. | |
65 | */ | |
66 | ||
94c09319 GL |
67 | /** |
68 | * of_device_make_bus_id - Use the device node data to assign a unique name | |
69 | * @dev: pointer to device structure that is linked to a device tree node | |
70 | * | |
71 | * This routine will first try using either the dcr-reg or the reg property | |
72 | * value to derive a unique name. As a last resort it will use the node | |
73 | * name followed by a unique number. | |
74 | */ | |
c6601225 | 75 | void of_device_make_bus_id(struct device *dev) |
94c09319 GL |
76 | { |
77 | static atomic_t bus_no_reg_magic; | |
78 | struct device_node *node = dev->of_node; | |
24fb530f | 79 | const __be32 *reg; |
94c09319 | 80 | u64 addr; |
5d61b165 | 81 | const __be32 *addrp; |
94c09319 GL |
82 | int magic; |
83 | ||
84 | #ifdef CONFIG_PPC_DCR | |
85 | /* | |
86 | * If it's a DCR based device, use 'd' for native DCRs | |
87 | * and 'D' for MMIO DCRs. | |
88 | */ | |
89 | reg = of_get_property(node, "dcr-reg", NULL); | |
90 | if (reg) { | |
91 | #ifdef CONFIG_PPC_DCR_NATIVE | |
92 | dev_set_name(dev, "d%x.%s", *reg, node->name); | |
93 | #else /* CONFIG_PPC_DCR_NATIVE */ | |
94 | u64 addr = of_translate_dcr_address(node, *reg, NULL); | |
95 | if (addr != OF_BAD_ADDR) { | |
96 | dev_set_name(dev, "D%llx.%s", | |
97 | (unsigned long long)addr, node->name); | |
98 | return; | |
99 | } | |
100 | #endif /* !CONFIG_PPC_DCR_NATIVE */ | |
101 | } | |
102 | #endif /* CONFIG_PPC_DCR */ | |
103 | ||
104 | /* | |
105 | * For MMIO, get the physical address | |
106 | */ | |
107 | reg = of_get_property(node, "reg", NULL); | |
108 | if (reg) { | |
5d61b165 SW |
109 | if (of_can_translate_address(node)) { |
110 | addr = of_translate_address(node, reg); | |
111 | } else { | |
112 | addrp = of_get_address(node, 0, NULL, NULL); | |
113 | if (addrp) | |
114 | addr = of_read_number(addrp, 1); | |
115 | else | |
116 | addr = OF_BAD_ADDR; | |
117 | } | |
94c09319 GL |
118 | if (addr != OF_BAD_ADDR) { |
119 | dev_set_name(dev, "%llx.%s", | |
120 | (unsigned long long)addr, node->name); | |
121 | return; | |
122 | } | |
123 | } | |
124 | ||
125 | /* | |
126 | * No BusID, use the node name and add a globally incremented | |
127 | * counter (and pray...) | |
128 | */ | |
129 | magic = atomic_add_return(1, &bus_no_reg_magic); | |
130 | dev_set_name(dev, "%s.%d", node->name, magic - 1); | |
131 | } | |
132 | ||
133 | /** | |
134 | * of_device_alloc - Allocate and initialize an of_device | |
135 | * @np: device node to assign to device | |
136 | * @bus_id: Name to assign to the device. May be null to use default name. | |
137 | * @parent: Parent device. | |
138 | */ | |
94a0cb1f | 139 | struct platform_device *of_device_alloc(struct device_node *np, |
94c09319 GL |
140 | const char *bus_id, |
141 | struct device *parent) | |
142 | { | |
94a0cb1f | 143 | struct platform_device *dev; |
52f6537c | 144 | int rc, i, num_reg = 0, num_irq; |
ac80a51e GL |
145 | struct resource *res, temp_res; |
146 | ||
7096d042 GL |
147 | dev = platform_device_alloc("", -1); |
148 | if (!dev) | |
149 | return NULL; | |
150 | ||
151 | /* count the io and irq resources */ | |
5d61b165 SW |
152 | if (of_can_translate_address(np)) |
153 | while (of_address_to_resource(np, num_reg, &temp_res) == 0) | |
154 | num_reg++; | |
52f6537c | 155 | num_irq = of_irq_count(np); |
ac80a51e | 156 | |
ac80a51e GL |
157 | /* Populate the resource table */ |
158 | if (num_irq || num_reg) { | |
7096d042 GL |
159 | res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL); |
160 | if (!res) { | |
161 | platform_device_put(dev); | |
162 | return NULL; | |
163 | } | |
164 | ||
ac80a51e GL |
165 | dev->num_resources = num_reg + num_irq; |
166 | dev->resource = res; | |
167 | for (i = 0; i < num_reg; i++, res++) { | |
168 | rc = of_address_to_resource(np, i, res); | |
169 | WARN_ON(rc); | |
170 | } | |
52f6537c | 171 | WARN_ON(of_irq_to_resource_table(np, res, num_irq) != num_irq); |
ac80a51e | 172 | } |
94c09319 GL |
173 | |
174 | dev->dev.of_node = of_node_get(np); | |
314b02f5 | 175 | #if defined(CONFIG_MICROBLAZE) |
94c09319 | 176 | dev->dev.dma_mask = &dev->archdata.dma_mask; |
9e3288dc | 177 | #endif |
94c09319 | 178 | dev->dev.parent = parent; |
94c09319 GL |
179 | |
180 | if (bus_id) | |
181 | dev_set_name(&dev->dev, "%s", bus_id); | |
182 | else | |
183 | of_device_make_bus_id(&dev->dev); | |
184 | ||
185 | return dev; | |
186 | } | |
187 | EXPORT_SYMBOL(of_device_alloc); | |
188 | ||
5fd200f3 | 189 | /** |
15c3597d | 190 | * of_platform_device_create_pdata - Alloc, initialize and register an of_device |
5fd200f3 GL |
191 | * @np: pointer to node to create device for |
192 | * @bus_id: name to assign device | |
15c3597d | 193 | * @platform_data: pointer to populate platform_data pointer with |
5fd200f3 | 194 | * @parent: Linux device model parent device. |
cd1e6504 GL |
195 | * |
196 | * Returns pointer to created platform device, or NULL if a device was not | |
197 | * registered. Unavailable devices will not get registered. | |
5fd200f3 | 198 | */ |
15c3597d GL |
199 | struct platform_device *of_platform_device_create_pdata( |
200 | struct device_node *np, | |
201 | const char *bus_id, | |
202 | void *platform_data, | |
203 | struct device *parent) | |
5fd200f3 | 204 | { |
94a0cb1f | 205 | struct platform_device *dev; |
5fd200f3 | 206 | |
cd1e6504 GL |
207 | if (!of_device_is_available(np)) |
208 | return NULL; | |
209 | ||
5fd200f3 GL |
210 | dev = of_device_alloc(np, bus_id, parent); |
211 | if (!dev) | |
212 | return NULL; | |
213 | ||
314b02f5 | 214 | #if defined(CONFIG_MICROBLAZE) |
5fd200f3 | 215 | dev->archdata.dma_mask = 0xffffffffUL; |
9e3288dc | 216 | #endif |
5fd200f3 | 217 | dev->dev.coherent_dma_mask = DMA_BIT_MASK(32); |
eca39301 | 218 | dev->dev.bus = &platform_bus_type; |
15c3597d | 219 | dev->dev.platform_data = platform_data; |
5fd200f3 GL |
220 | |
221 | /* We do not fill the DMA ops for platform devices by default. | |
222 | * This is currently the responsibility of the platform code | |
223 | * to do such, possibly using a device notifier | |
224 | */ | |
225 | ||
7096d042 GL |
226 | if (of_device_add(dev) != 0) { |
227 | platform_device_put(dev); | |
5fd200f3 GL |
228 | return NULL; |
229 | } | |
230 | ||
231 | return dev; | |
232 | } | |
15c3597d GL |
233 | |
234 | /** | |
235 | * of_platform_device_create - Alloc, initialize and register an of_device | |
236 | * @np: pointer to node to create device for | |
237 | * @bus_id: name to assign device | |
238 | * @parent: Linux device model parent device. | |
239 | * | |
240 | * Returns pointer to created platform device, or NULL if a device was not | |
241 | * registered. Unavailable devices will not get registered. | |
242 | */ | |
243 | struct platform_device *of_platform_device_create(struct device_node *np, | |
244 | const char *bus_id, | |
245 | struct device *parent) | |
246 | { | |
247 | return of_platform_device_create_pdata(np, bus_id, NULL, parent); | |
248 | } | |
5fd200f3 GL |
249 | EXPORT_SYMBOL(of_platform_device_create); |
250 | ||
5de1540b GL |
251 | #ifdef CONFIG_ARM_AMBA |
252 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
253 | const char *bus_id, | |
254 | void *platform_data, | |
255 | struct device *parent) | |
256 | { | |
257 | struct amba_device *dev; | |
258 | const void *prop; | |
259 | int i, ret; | |
260 | ||
261 | pr_debug("Creating amba device %s\n", node->full_name); | |
262 | ||
263 | if (!of_device_is_available(node)) | |
264 | return NULL; | |
265 | ||
c0f72f8a | 266 | dev = amba_device_alloc(NULL, 0, 0); |
5de1540b GL |
267 | if (!dev) |
268 | return NULL; | |
269 | ||
270 | /* setup generic device info */ | |
271 | dev->dev.coherent_dma_mask = ~0; | |
272 | dev->dev.of_node = of_node_get(node); | |
273 | dev->dev.parent = parent; | |
274 | dev->dev.platform_data = platform_data; | |
275 | if (bus_id) | |
276 | dev_set_name(&dev->dev, "%s", bus_id); | |
277 | else | |
278 | of_device_make_bus_id(&dev->dev); | |
279 | ||
280 | /* setup amba-specific device info */ | |
281 | dev->dma_mask = ~0; | |
282 | ||
283 | /* Allow the HW Peripheral ID to be overridden */ | |
284 | prop = of_get_property(node, "arm,primecell-periphid", NULL); | |
285 | if (prop) | |
286 | dev->periphid = of_read_ulong(prop, 1); | |
287 | ||
288 | /* Decode the IRQs and address ranges */ | |
289 | for (i = 0; i < AMBA_NR_IRQS; i++) | |
290 | dev->irq[i] = irq_of_parse_and_map(node, i); | |
291 | ||
292 | ret = of_address_to_resource(node, 0, &dev->res); | |
293 | if (ret) | |
294 | goto err_free; | |
295 | ||
c0f72f8a | 296 | ret = amba_device_add(dev, &iomem_resource); |
5de1540b GL |
297 | if (ret) |
298 | goto err_free; | |
299 | ||
300 | return dev; | |
301 | ||
302 | err_free: | |
c0f72f8a | 303 | amba_device_put(dev); |
5de1540b GL |
304 | return NULL; |
305 | } | |
306 | #else /* CONFIG_ARM_AMBA */ | |
307 | static struct amba_device *of_amba_device_create(struct device_node *node, | |
308 | const char *bus_id, | |
309 | void *platform_data, | |
310 | struct device *parent) | |
311 | { | |
312 | return NULL; | |
313 | } | |
314 | #endif /* CONFIG_ARM_AMBA */ | |
315 | ||
15c3597d GL |
316 | /** |
317 | * of_devname_lookup() - Given a device node, lookup the preferred Linux name | |
318 | */ | |
319 | static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup, | |
320 | struct device_node *np) | |
321 | { | |
322 | struct resource res; | |
303f59d1 OJ |
323 | |
324 | if (!lookup) | |
325 | return NULL; | |
326 | ||
f88e1ae8 | 327 | for(; lookup->compatible != NULL; lookup++) { |
303f59d1 OJ |
328 | if (!of_device_is_compatible(np, lookup->compatible)) |
329 | continue; | |
84774e61 LJ |
330 | if (!of_address_to_resource(np, 0, &res)) |
331 | if (res.start != lookup->phys_addr) | |
332 | continue; | |
303f59d1 OJ |
333 | pr_debug("%s: devname=%s\n", np->full_name, lookup->name); |
334 | return lookup; | |
15c3597d | 335 | } |
303f59d1 | 336 | |
15c3597d GL |
337 | return NULL; |
338 | } | |
339 | ||
5fd200f3 | 340 | /** |
38e9e21d | 341 | * of_platform_bus_create() - Create a device for a node and its children. |
5fd200f3 | 342 | * @bus: device node of the bus to instantiate |
1eed4c07 | 343 | * @matches: match table for bus nodes |
303f59d1 | 344 | * @lookup: auxdata table for matching id and platform_data with device nodes |
38e9e21d | 345 | * @parent: parent for new device, or NULL for top level. |
303f59d1 | 346 | * @strict: require compatible property |
38e9e21d GL |
347 | * |
348 | * Creates a platform_device for the provided device_node, and optionally | |
349 | * recursively create devices for all the child nodes. | |
5fd200f3 | 350 | */ |
38e9e21d | 351 | static int of_platform_bus_create(struct device_node *bus, |
5fd200f3 | 352 | const struct of_device_id *matches, |
15c3597d | 353 | const struct of_dev_auxdata *lookup, |
29d4f8a4 | 354 | struct device *parent, bool strict) |
5fd200f3 | 355 | { |
15c3597d | 356 | const struct of_dev_auxdata *auxdata; |
5fd200f3 | 357 | struct device_node *child; |
94a0cb1f | 358 | struct platform_device *dev; |
15c3597d GL |
359 | const char *bus_id = NULL; |
360 | void *platform_data = NULL; | |
5fd200f3 GL |
361 | int rc = 0; |
362 | ||
29d4f8a4 GL |
363 | /* Make sure it has a compatible property */ |
364 | if (strict && (!of_get_property(bus, "compatible", NULL))) { | |
365 | pr_debug("%s() - skipping %s, no compatible prop\n", | |
366 | __func__, bus->full_name); | |
367 | return 0; | |
368 | } | |
369 | ||
15c3597d GL |
370 | auxdata = of_dev_lookup(lookup, bus); |
371 | if (auxdata) { | |
372 | bus_id = auxdata->name; | |
373 | platform_data = auxdata->platform_data; | |
374 | } | |
375 | ||
5de1540b | 376 | if (of_device_is_compatible(bus, "arm,primecell")) { |
15c3597d | 377 | of_amba_device_create(bus, bus_id, platform_data, parent); |
5de1540b GL |
378 | return 0; |
379 | } | |
380 | ||
15c3597d | 381 | dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent); |
38e9e21d GL |
382 | if (!dev || !of_match_node(matches, bus)) |
383 | return 0; | |
384 | ||
5fd200f3 GL |
385 | for_each_child_of_node(bus, child) { |
386 | pr_debug(" create child: %s\n", child->full_name); | |
15c3597d | 387 | rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict); |
5fd200f3 GL |
388 | if (rc) { |
389 | of_node_put(child); | |
390 | break; | |
391 | } | |
392 | } | |
393 | return rc; | |
394 | } | |
395 | ||
396 | /** | |
38e9e21d | 397 | * of_platform_bus_probe() - Probe the device-tree for platform buses |
5fd200f3 | 398 | * @root: parent of the first level to probe or NULL for the root of the tree |
1eed4c07 | 399 | * @matches: match table for bus nodes |
5fd200f3 GL |
400 | * @parent: parent to hook devices from, NULL for toplevel |
401 | * | |
402 | * Note that children of the provided root are not instantiated as devices | |
403 | * unless the specified root itself matches the bus list and is not NULL. | |
404 | */ | |
405 | int of_platform_bus_probe(struct device_node *root, | |
406 | const struct of_device_id *matches, | |
407 | struct device *parent) | |
408 | { | |
409 | struct device_node *child; | |
5fd200f3 GL |
410 | int rc = 0; |
411 | ||
1eed4c07 GL |
412 | root = root ? of_node_get(root) : of_find_node_by_path("/"); |
413 | if (!root) | |
60d59913 | 414 | return -EINVAL; |
5fd200f3 GL |
415 | |
416 | pr_debug("of_platform_bus_probe()\n"); | |
417 | pr_debug(" starting at: %s\n", root->full_name); | |
418 | ||
1eed4c07 | 419 | /* Do a self check of bus type, if there's a match, create children */ |
5fd200f3 | 420 | if (of_match_node(matches, root)) { |
15c3597d | 421 | rc = of_platform_bus_create(root, matches, NULL, parent, false); |
38e9e21d | 422 | } else for_each_child_of_node(root, child) { |
5fd200f3 GL |
423 | if (!of_match_node(matches, child)) |
424 | continue; | |
15c3597d | 425 | rc = of_platform_bus_create(child, matches, NULL, parent, false); |
38e9e21d | 426 | if (rc) |
5fd200f3 | 427 | break; |
5fd200f3 | 428 | } |
38e9e21d | 429 | |
5fd200f3 GL |
430 | of_node_put(root); |
431 | return rc; | |
432 | } | |
433 | EXPORT_SYMBOL(of_platform_bus_probe); | |
29d4f8a4 GL |
434 | |
435 | /** | |
436 | * of_platform_populate() - Populate platform_devices from device tree data | |
437 | * @root: parent of the first level to probe or NULL for the root of the tree | |
438 | * @matches: match table, NULL to use the default | |
92039ed1 | 439 | * @lookup: auxdata table for matching id and platform_data with device nodes |
29d4f8a4 GL |
440 | * @parent: parent to hook devices from, NULL for toplevel |
441 | * | |
442 | * Similar to of_platform_bus_probe(), this function walks the device tree | |
443 | * and creates devices from nodes. It differs in that it follows the modern | |
444 | * convention of requiring all device nodes to have a 'compatible' property, | |
445 | * and it is suitable for creating devices which are children of the root | |
446 | * node (of_platform_bus_probe will only create children of the root which | |
447 | * are selected by the @matches argument). | |
448 | * | |
449 | * New board support should be using this function instead of | |
450 | * of_platform_bus_probe(). | |
451 | * | |
452 | * Returns 0 on success, < 0 on failure. | |
453 | */ | |
454 | int of_platform_populate(struct device_node *root, | |
455 | const struct of_device_id *matches, | |
15c3597d | 456 | const struct of_dev_auxdata *lookup, |
29d4f8a4 GL |
457 | struct device *parent) |
458 | { | |
459 | struct device_node *child; | |
460 | int rc = 0; | |
461 | ||
462 | root = root ? of_node_get(root) : of_find_node_by_path("/"); | |
463 | if (!root) | |
464 | return -EINVAL; | |
465 | ||
466 | for_each_child_of_node(root, child) { | |
15c3597d | 467 | rc = of_platform_bus_create(child, matches, lookup, parent, true); |
29d4f8a4 GL |
468 | if (rc) |
469 | break; | |
470 | } | |
471 | ||
472 | of_node_put(root); | |
473 | return rc; | |
474 | } | |
e001f1c8 | 475 | EXPORT_SYMBOL_GPL(of_platform_populate); |
964dba28 | 476 | #endif /* CONFIG_OF_ADDRESS */ |