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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>
15#include <linux/module.h>
16#include <linux/amba/bus.h>
17#include <linux/device.h>
18#include <linux/dma-mapping.h>
19#include <linux/slab.h>
20#include <linux/of_address.h>
21#include <linux/of_device.h>
22#include <linux/of_irq.h>
23#include <linux/of_platform.h>
24#include <linux/platform_device.h>
25
26const 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
34static 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 */
45struct 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}
52EXPORT_SYMBOL(of_find_device_by_node);
53
54#if defined(CONFIG_PPC_DCR)
55#include <asm/dcr.h>
56#endif
57
58#ifdef CONFIG_OF_ADDRESS
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
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 */
75void of_device_make_bus_id(struct device *dev)
76{
77 static atomic_t bus_no_reg_magic;
78 struct device_node *node = dev->of_node;
79 const __be32 *reg;
80 u64 addr;
81 const __be32 *addrp;
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) {
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 }
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 */
139struct platform_device *of_device_alloc(struct device_node *np,
140 const char *bus_id,
141 struct device *parent)
142{
143 struct platform_device *dev;
144 int rc, i, num_reg = 0, num_irq;
145 struct resource *res, temp_res;
146
147 dev = platform_device_alloc("", -1);
148 if (!dev)
149 return NULL;
150
151 /* count the io and irq resources */
152 if (of_can_translate_address(np))
153 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
154 num_reg++;
155 num_irq = of_irq_count(np);
156
157 /* Populate the resource table */
158 if (num_irq || num_reg) {
159 res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
160 if (!res) {
161 platform_device_put(dev);
162 return NULL;
163 }
164
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 }
171 if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
172 pr_debug("not all legacy IRQ resources mapped for %s\n",
173 np->name);
174 }
175
176 dev->dev.of_node = of_node_get(np);
177#if defined(CONFIG_MICROBLAZE)
178 dev->dev.dma_mask = &dev->archdata.dma_mask;
179#endif
180 dev->dev.parent = parent;
181
182 if (bus_id)
183 dev_set_name(&dev->dev, "%s", bus_id);
184 else
185 of_device_make_bus_id(&dev->dev);
186
187 return dev;
188}
189EXPORT_SYMBOL(of_device_alloc);
190
191/**
192 * of_platform_device_create_pdata - Alloc, initialize and register an of_device
193 * @np: pointer to node to create device for
194 * @bus_id: name to assign device
195 * @platform_data: pointer to populate platform_data pointer with
196 * @parent: Linux device model parent device.
197 *
198 * Returns pointer to created platform device, or NULL if a device was not
199 * registered. Unavailable devices will not get registered.
200 */
201static struct platform_device *of_platform_device_create_pdata(
202 struct device_node *np,
203 const char *bus_id,
204 void *platform_data,
205 struct device *parent)
206{
207 struct platform_device *dev;
208
209 if (!of_device_is_available(np))
210 return NULL;
211
212 dev = of_device_alloc(np, bus_id, parent);
213 if (!dev)
214 return NULL;
215
216#if defined(CONFIG_MICROBLAZE)
217 dev->archdata.dma_mask = 0xffffffffUL;
218#endif
219 dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
220 if (!dev->dev.dma_mask)
221 dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
222 dev->dev.bus = &platform_bus_type;
223 dev->dev.platform_data = platform_data;
224
225 /* We do not fill the DMA ops for platform devices by default.
226 * This is currently the responsibility of the platform code
227 * to do such, possibly using a device notifier
228 */
229
230 if (of_device_add(dev) != 0) {
231 platform_device_put(dev);
232 return NULL;
233 }
234
235 return dev;
236}
237
238/**
239 * of_platform_device_create - Alloc, initialize and register an of_device
240 * @np: pointer to node to create device for
241 * @bus_id: name to assign device
242 * @parent: Linux device model parent device.
243 *
244 * Returns pointer to created platform device, or NULL if a device was not
245 * registered. Unavailable devices will not get registered.
246 */
247struct platform_device *of_platform_device_create(struct device_node *np,
248 const char *bus_id,
249 struct device *parent)
250{
251 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
252}
253EXPORT_SYMBOL(of_platform_device_create);
254
255#ifdef CONFIG_ARM_AMBA
256static struct amba_device *of_amba_device_create(struct device_node *node,
257 const char *bus_id,
258 void *platform_data,
259 struct device *parent)
260{
261 struct amba_device *dev;
262 const void *prop;
263 int i, ret;
264
265 pr_debug("Creating amba device %s\n", node->full_name);
266
267 if (!of_device_is_available(node))
268 return NULL;
269
270 dev = amba_device_alloc(NULL, 0, 0);
271 if (!dev) {
272 pr_err("%s(): amba_device_alloc() failed for %s\n",
273 __func__, node->full_name);
274 return NULL;
275 }
276
277 /* setup generic device info */
278 dev->dev.coherent_dma_mask = ~0;
279 dev->dev.of_node = of_node_get(node);
280 dev->dev.parent = parent;
281 dev->dev.platform_data = platform_data;
282 if (bus_id)
283 dev_set_name(&dev->dev, "%s", bus_id);
284 else
285 of_device_make_bus_id(&dev->dev);
286
287 /* Allow the HW Peripheral ID to be overridden */
288 prop = of_get_property(node, "arm,primecell-periphid", NULL);
289 if (prop)
290 dev->periphid = of_read_ulong(prop, 1);
291
292 /* Decode the IRQs and address ranges */
293 for (i = 0; i < AMBA_NR_IRQS; i++)
294 dev->irq[i] = irq_of_parse_and_map(node, i);
295
296 ret = of_address_to_resource(node, 0, &dev->res);
297 if (ret) {
298 pr_err("%s(): of_address_to_resource() failed (%d) for %s\n",
299 __func__, ret, node->full_name);
300 goto err_free;
301 }
302
303 ret = amba_device_add(dev, &iomem_resource);
304 if (ret) {
305 pr_err("%s(): amba_device_add() failed (%d) for %s\n",
306 __func__, ret, node->full_name);
307 goto err_free;
308 }
309
310 return dev;
311
312err_free:
313 amba_device_put(dev);
314 return NULL;
315}
316#else /* CONFIG_ARM_AMBA */
317static struct amba_device *of_amba_device_create(struct device_node *node,
318 const char *bus_id,
319 void *platform_data,
320 struct device *parent)
321{
322 return NULL;
323}
324#endif /* CONFIG_ARM_AMBA */
325
326/**
327 * of_devname_lookup() - Given a device node, lookup the preferred Linux name
328 */
329static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
330 struct device_node *np)
331{
332 struct resource res;
333
334 if (!lookup)
335 return NULL;
336
337 for(; lookup->compatible != NULL; lookup++) {
338 if (!of_device_is_compatible(np, lookup->compatible))
339 continue;
340 if (!of_address_to_resource(np, 0, &res))
341 if (res.start != lookup->phys_addr)
342 continue;
343 pr_debug("%s: devname=%s\n", np->full_name, lookup->name);
344 return lookup;
345 }
346
347 return NULL;
348}
349
350/**
351 * of_platform_bus_create() - Create a device for a node and its children.
352 * @bus: device node of the bus to instantiate
353 * @matches: match table for bus nodes
354 * @lookup: auxdata table for matching id and platform_data with device nodes
355 * @parent: parent for new device, or NULL for top level.
356 * @strict: require compatible property
357 *
358 * Creates a platform_device for the provided device_node, and optionally
359 * recursively create devices for all the child nodes.
360 */
361static int of_platform_bus_create(struct device_node *bus,
362 const struct of_device_id *matches,
363 const struct of_dev_auxdata *lookup,
364 struct device *parent, bool strict)
365{
366 const struct of_dev_auxdata *auxdata;
367 struct device_node *child;
368 struct platform_device *dev;
369 const char *bus_id = NULL;
370 void *platform_data = NULL;
371 int rc = 0;
372
373 /* Make sure it has a compatible property */
374 if (strict && (!of_get_property(bus, "compatible", NULL))) {
375 pr_debug("%s() - skipping %s, no compatible prop\n",
376 __func__, bus->full_name);
377 return 0;
378 }
379
380 auxdata = of_dev_lookup(lookup, bus);
381 if (auxdata) {
382 bus_id = auxdata->name;
383 platform_data = auxdata->platform_data;
384 }
385
386 if (of_device_is_compatible(bus, "arm,primecell")) {
387 /*
388 * Don't return an error here to keep compatibility with older
389 * device tree files.
390 */
391 of_amba_device_create(bus, bus_id, platform_data, parent);
392 return 0;
393 }
394
395 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
396 if (!dev || !of_match_node(matches, bus))
397 return 0;
398
399 for_each_child_of_node(bus, child) {
400 pr_debug(" create child: %s\n", child->full_name);
401 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
402 if (rc) {
403 of_node_put(child);
404 break;
405 }
406 }
407 return rc;
408}
409
410/**
411 * of_platform_bus_probe() - Probe the device-tree for platform buses
412 * @root: parent of the first level to probe or NULL for the root of the tree
413 * @matches: match table for bus nodes
414 * @parent: parent to hook devices from, NULL for toplevel
415 *
416 * Note that children of the provided root are not instantiated as devices
417 * unless the specified root itself matches the bus list and is not NULL.
418 */
419int of_platform_bus_probe(struct device_node *root,
420 const struct of_device_id *matches,
421 struct device *parent)
422{
423 struct device_node *child;
424 int rc = 0;
425
426 root = root ? of_node_get(root) : of_find_node_by_path("/");
427 if (!root)
428 return -EINVAL;
429
430 pr_debug("of_platform_bus_probe()\n");
431 pr_debug(" starting at: %s\n", root->full_name);
432
433 /* Do a self check of bus type, if there's a match, create children */
434 if (of_match_node(matches, root)) {
435 rc = of_platform_bus_create(root, matches, NULL, parent, false);
436 } else for_each_child_of_node(root, child) {
437 if (!of_match_node(matches, child))
438 continue;
439 rc = of_platform_bus_create(child, matches, NULL, parent, false);
440 if (rc)
441 break;
442 }
443
444 of_node_put(root);
445 return rc;
446}
447EXPORT_SYMBOL(of_platform_bus_probe);
448
449/**
450 * of_platform_populate() - Populate platform_devices from device tree data
451 * @root: parent of the first level to probe or NULL for the root of the tree
452 * @matches: match table, NULL to use the default
453 * @lookup: auxdata table for matching id and platform_data with device nodes
454 * @parent: parent to hook devices from, NULL for toplevel
455 *
456 * Similar to of_platform_bus_probe(), this function walks the device tree
457 * and creates devices from nodes. It differs in that it follows the modern
458 * convention of requiring all device nodes to have a 'compatible' property,
459 * and it is suitable for creating devices which are children of the root
460 * node (of_platform_bus_probe will only create children of the root which
461 * are selected by the @matches argument).
462 *
463 * New board support should be using this function instead of
464 * of_platform_bus_probe().
465 *
466 * Returns 0 on success, < 0 on failure.
467 */
468int of_platform_populate(struct device_node *root,
469 const struct of_device_id *matches,
470 const struct of_dev_auxdata *lookup,
471 struct device *parent)
472{
473 struct device_node *child;
474 int rc = 0;
475
476 root = root ? of_node_get(root) : of_find_node_by_path("/");
477 if (!root)
478 return -EINVAL;
479
480 for_each_child_of_node(root, child) {
481 rc = of_platform_bus_create(child, matches, lookup, parent, true);
482 if (rc)
483 break;
484 }
485
486 of_node_put(root);
487 return rc;
488}
489EXPORT_SYMBOL_GPL(of_platform_populate);
490#endif /* CONFIG_OF_ADDRESS */
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>
15#include <linux/module.h>
16#include <linux/amba/bus.h>
17#include <linux/device.h>
18#include <linux/dma-mapping.h>
19#include <linux/slab.h>
20#include <linux/of_address.h>
21#include <linux/of_device.h>
22#include <linux/of_irq.h>
23#include <linux/of_platform.h>
24#include <linux/platform_device.h>
25
26const struct of_device_id of_default_bus_match_table[] = {
27 { .compatible = "simple-bus", },
28 { .compatible = "simple-mfd", },
29#ifdef CONFIG_ARM_AMBA
30 { .compatible = "arm,amba-bus", },
31#endif /* CONFIG_ARM_AMBA */
32 {} /* Empty terminated list */
33};
34EXPORT_SYMBOL(of_default_bus_match_table);
35
36static int of_dev_node_match(struct device *dev, void *data)
37{
38 return dev->of_node == data;
39}
40
41/**
42 * of_find_device_by_node - Find the platform_device associated with a node
43 * @np: Pointer to device tree node
44 *
45 * Returns platform_device pointer, or NULL if not found
46 */
47struct platform_device *of_find_device_by_node(struct device_node *np)
48{
49 struct device *dev;
50
51 dev = bus_find_device(&platform_bus_type, NULL, np, of_dev_node_match);
52 return dev ? to_platform_device(dev) : NULL;
53}
54EXPORT_SYMBOL(of_find_device_by_node);
55
56#ifdef CONFIG_OF_ADDRESS
57/*
58 * The following routines scan a subtree and registers a device for
59 * each applicable node.
60 *
61 * Note: sparc doesn't use these routines because it has a different
62 * mechanism for creating devices from device tree nodes.
63 */
64
65/**
66 * of_device_make_bus_id - Use the device node data to assign a unique name
67 * @dev: pointer to device structure that is linked to a device tree node
68 *
69 * This routine will first try using the translated bus address to
70 * derive a unique name. If it cannot, then it will prepend names from
71 * parent nodes until a unique name can be derived.
72 */
73void of_device_make_bus_id(struct device *dev)
74{
75 struct device_node *node = dev->of_node;
76 const __be32 *reg;
77 u64 addr;
78
79 /* Construct the name, using parent nodes if necessary to ensure uniqueness */
80 while (node->parent) {
81 /*
82 * If the address can be translated, then that is as much
83 * uniqueness as we need. Make it the first component and return
84 */
85 reg = of_get_property(node, "reg", NULL);
86 if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) {
87 dev_set_name(dev, dev_name(dev) ? "%llx.%s:%s" : "%llx.%s",
88 (unsigned long long)addr, node->name,
89 dev_name(dev));
90 return;
91 }
92
93 /* format arguments only used if dev_name() resolves to NULL */
94 dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s",
95 strrchr(node->full_name, '/') + 1, dev_name(dev));
96 node = node->parent;
97 }
98}
99
100/**
101 * of_device_alloc - Allocate and initialize an of_device
102 * @np: device node to assign to device
103 * @bus_id: Name to assign to the device. May be null to use default name.
104 * @parent: Parent device.
105 */
106struct platform_device *of_device_alloc(struct device_node *np,
107 const char *bus_id,
108 struct device *parent)
109{
110 struct platform_device *dev;
111 int rc, i, num_reg = 0, num_irq;
112 struct resource *res, temp_res;
113
114 dev = platform_device_alloc("", -1);
115 if (!dev)
116 return NULL;
117
118 /* count the io and irq resources */
119 while (of_address_to_resource(np, num_reg, &temp_res) == 0)
120 num_reg++;
121 num_irq = of_irq_count(np);
122
123 /* Populate the resource table */
124 if (num_irq || num_reg) {
125 res = kzalloc(sizeof(*res) * (num_irq + num_reg), GFP_KERNEL);
126 if (!res) {
127 platform_device_put(dev);
128 return NULL;
129 }
130
131 dev->num_resources = num_reg + num_irq;
132 dev->resource = res;
133 for (i = 0; i < num_reg; i++, res++) {
134 rc = of_address_to_resource(np, i, res);
135 WARN_ON(rc);
136 }
137 if (of_irq_to_resource_table(np, res, num_irq) != num_irq)
138 pr_debug("not all legacy IRQ resources mapped for %s\n",
139 np->name);
140 }
141
142 dev->dev.of_node = of_node_get(np);
143 dev->dev.parent = parent ? : &platform_bus;
144
145 if (bus_id)
146 dev_set_name(&dev->dev, "%s", bus_id);
147 else
148 of_device_make_bus_id(&dev->dev);
149
150 return dev;
151}
152EXPORT_SYMBOL(of_device_alloc);
153
154static void of_dma_deconfigure(struct device *dev)
155{
156 arch_teardown_dma_ops(dev);
157}
158
159/**
160 * of_platform_device_create_pdata - Alloc, initialize and register an of_device
161 * @np: pointer to node to create device for
162 * @bus_id: name to assign device
163 * @platform_data: pointer to populate platform_data pointer with
164 * @parent: Linux device model parent device.
165 *
166 * Returns pointer to created platform device, or NULL if a device was not
167 * registered. Unavailable devices will not get registered.
168 */
169static struct platform_device *of_platform_device_create_pdata(
170 struct device_node *np,
171 const char *bus_id,
172 void *platform_data,
173 struct device *parent)
174{
175 struct platform_device *dev;
176
177 if (!of_device_is_available(np) ||
178 of_node_test_and_set_flag(np, OF_POPULATED))
179 return NULL;
180
181 dev = of_device_alloc(np, bus_id, parent);
182 if (!dev)
183 goto err_clear_flag;
184
185 dev->dev.bus = &platform_bus_type;
186 dev->dev.platform_data = platform_data;
187 of_dma_configure(&dev->dev, dev->dev.of_node);
188 of_msi_configure(&dev->dev, dev->dev.of_node);
189
190 if (of_device_add(dev) != 0) {
191 of_dma_deconfigure(&dev->dev);
192 platform_device_put(dev);
193 goto err_clear_flag;
194 }
195
196 return dev;
197
198err_clear_flag:
199 of_node_clear_flag(np, OF_POPULATED);
200 return NULL;
201}
202
203/**
204 * of_platform_device_create - Alloc, initialize and register an of_device
205 * @np: pointer to node to create device for
206 * @bus_id: name to assign device
207 * @parent: Linux device model parent device.
208 *
209 * Returns pointer to created platform device, or NULL if a device was not
210 * registered. Unavailable devices will not get registered.
211 */
212struct platform_device *of_platform_device_create(struct device_node *np,
213 const char *bus_id,
214 struct device *parent)
215{
216 return of_platform_device_create_pdata(np, bus_id, NULL, parent);
217}
218EXPORT_SYMBOL(of_platform_device_create);
219
220#ifdef CONFIG_ARM_AMBA
221static struct amba_device *of_amba_device_create(struct device_node *node,
222 const char *bus_id,
223 void *platform_data,
224 struct device *parent)
225{
226 struct amba_device *dev;
227 const void *prop;
228 int i, ret;
229
230 pr_debug("Creating amba device %s\n", node->full_name);
231
232 if (!of_device_is_available(node) ||
233 of_node_test_and_set_flag(node, OF_POPULATED))
234 return NULL;
235
236 dev = amba_device_alloc(NULL, 0, 0);
237 if (!dev) {
238 pr_err("%s(): amba_device_alloc() failed for %s\n",
239 __func__, node->full_name);
240 goto err_clear_flag;
241 }
242
243 /* setup generic device info */
244 dev->dev.of_node = of_node_get(node);
245 dev->dev.parent = parent ? : &platform_bus;
246 dev->dev.platform_data = platform_data;
247 if (bus_id)
248 dev_set_name(&dev->dev, "%s", bus_id);
249 else
250 of_device_make_bus_id(&dev->dev);
251 of_dma_configure(&dev->dev, dev->dev.of_node);
252
253 /* Allow the HW Peripheral ID to be overridden */
254 prop = of_get_property(node, "arm,primecell-periphid", NULL);
255 if (prop)
256 dev->periphid = of_read_ulong(prop, 1);
257
258 /* Decode the IRQs and address ranges */
259 for (i = 0; i < AMBA_NR_IRQS; i++)
260 dev->irq[i] = irq_of_parse_and_map(node, i);
261
262 ret = of_address_to_resource(node, 0, &dev->res);
263 if (ret) {
264 pr_err("%s(): of_address_to_resource() failed (%d) for %s\n",
265 __func__, ret, node->full_name);
266 goto err_free;
267 }
268
269 ret = amba_device_add(dev, &iomem_resource);
270 if (ret) {
271 pr_err("%s(): amba_device_add() failed (%d) for %s\n",
272 __func__, ret, node->full_name);
273 goto err_free;
274 }
275
276 return dev;
277
278err_free:
279 amba_device_put(dev);
280err_clear_flag:
281 of_node_clear_flag(node, OF_POPULATED);
282 return NULL;
283}
284#else /* CONFIG_ARM_AMBA */
285static struct amba_device *of_amba_device_create(struct device_node *node,
286 const char *bus_id,
287 void *platform_data,
288 struct device *parent)
289{
290 return NULL;
291}
292#endif /* CONFIG_ARM_AMBA */
293
294/**
295 * of_devname_lookup() - Given a device node, lookup the preferred Linux name
296 */
297static const struct of_dev_auxdata *of_dev_lookup(const struct of_dev_auxdata *lookup,
298 struct device_node *np)
299{
300 struct resource res;
301
302 if (!lookup)
303 return NULL;
304
305 for(; lookup->compatible != NULL; lookup++) {
306 if (!of_device_is_compatible(np, lookup->compatible))
307 continue;
308 if (!of_address_to_resource(np, 0, &res))
309 if (res.start != lookup->phys_addr)
310 continue;
311 pr_debug("%s: devname=%s\n", np->full_name, lookup->name);
312 return lookup;
313 }
314
315 return NULL;
316}
317
318/**
319 * of_platform_bus_create() - Create a device for a node and its children.
320 * @bus: device node of the bus to instantiate
321 * @matches: match table for bus nodes
322 * @lookup: auxdata table for matching id and platform_data with device nodes
323 * @parent: parent for new device, or NULL for top level.
324 * @strict: require compatible property
325 *
326 * Creates a platform_device for the provided device_node, and optionally
327 * recursively create devices for all the child nodes.
328 */
329static int of_platform_bus_create(struct device_node *bus,
330 const struct of_device_id *matches,
331 const struct of_dev_auxdata *lookup,
332 struct device *parent, bool strict)
333{
334 const struct of_dev_auxdata *auxdata;
335 struct device_node *child;
336 struct platform_device *dev;
337 const char *bus_id = NULL;
338 void *platform_data = NULL;
339 int rc = 0;
340
341 /* Make sure it has a compatible property */
342 if (strict && (!of_get_property(bus, "compatible", NULL))) {
343 pr_debug("%s() - skipping %s, no compatible prop\n",
344 __func__, bus->full_name);
345 return 0;
346 }
347
348 auxdata = of_dev_lookup(lookup, bus);
349 if (auxdata) {
350 bus_id = auxdata->name;
351 platform_data = auxdata->platform_data;
352 }
353
354 if (of_device_is_compatible(bus, "arm,primecell")) {
355 /*
356 * Don't return an error here to keep compatibility with older
357 * device tree files.
358 */
359 of_amba_device_create(bus, bus_id, platform_data, parent);
360 return 0;
361 }
362
363 dev = of_platform_device_create_pdata(bus, bus_id, platform_data, parent);
364 if (!dev || !of_match_node(matches, bus))
365 return 0;
366
367 for_each_child_of_node(bus, child) {
368 pr_debug(" create child: %s\n", child->full_name);
369 rc = of_platform_bus_create(child, matches, lookup, &dev->dev, strict);
370 if (rc) {
371 of_node_put(child);
372 break;
373 }
374 }
375 of_node_set_flag(bus, OF_POPULATED_BUS);
376 return rc;
377}
378
379/**
380 * of_platform_bus_probe() - Probe the device-tree for platform buses
381 * @root: parent of the first level to probe or NULL for the root of the tree
382 * @matches: match table for bus nodes
383 * @parent: parent to hook devices from, NULL for toplevel
384 *
385 * Note that children of the provided root are not instantiated as devices
386 * unless the specified root itself matches the bus list and is not NULL.
387 */
388int of_platform_bus_probe(struct device_node *root,
389 const struct of_device_id *matches,
390 struct device *parent)
391{
392 struct device_node *child;
393 int rc = 0;
394
395 root = root ? of_node_get(root) : of_find_node_by_path("/");
396 if (!root)
397 return -EINVAL;
398
399 pr_debug("of_platform_bus_probe()\n");
400 pr_debug(" starting at: %s\n", root->full_name);
401
402 /* Do a self check of bus type, if there's a match, create children */
403 if (of_match_node(matches, root)) {
404 rc = of_platform_bus_create(root, matches, NULL, parent, false);
405 } else for_each_child_of_node(root, child) {
406 if (!of_match_node(matches, child))
407 continue;
408 rc = of_platform_bus_create(child, matches, NULL, parent, false);
409 if (rc) {
410 of_node_put(child);
411 break;
412 }
413 }
414
415 of_node_put(root);
416 return rc;
417}
418EXPORT_SYMBOL(of_platform_bus_probe);
419
420/**
421 * of_platform_populate() - Populate platform_devices from device tree data
422 * @root: parent of the first level to probe or NULL for the root of the tree
423 * @matches: match table, NULL to use the default
424 * @lookup: auxdata table for matching id and platform_data with device nodes
425 * @parent: parent to hook devices from, NULL for toplevel
426 *
427 * Similar to of_platform_bus_probe(), this function walks the device tree
428 * and creates devices from nodes. It differs in that it follows the modern
429 * convention of requiring all device nodes to have a 'compatible' property,
430 * and it is suitable for creating devices which are children of the root
431 * node (of_platform_bus_probe will only create children of the root which
432 * are selected by the @matches argument).
433 *
434 * New board support should be using this function instead of
435 * of_platform_bus_probe().
436 *
437 * Returns 0 on success, < 0 on failure.
438 */
439int of_platform_populate(struct device_node *root,
440 const struct of_device_id *matches,
441 const struct of_dev_auxdata *lookup,
442 struct device *parent)
443{
444 struct device_node *child;
445 int rc = 0;
446
447 root = root ? of_node_get(root) : of_find_node_by_path("/");
448 if (!root)
449 return -EINVAL;
450
451 for_each_child_of_node(root, child) {
452 rc = of_platform_bus_create(child, matches, lookup, parent, true);
453 if (rc) {
454 of_node_put(child);
455 break;
456 }
457 }
458 of_node_set_flag(root, OF_POPULATED_BUS);
459
460 of_node_put(root);
461 return rc;
462}
463EXPORT_SYMBOL_GPL(of_platform_populate);
464
465int of_platform_default_populate(struct device_node *root,
466 const struct of_dev_auxdata *lookup,
467 struct device *parent)
468{
469 return of_platform_populate(root, of_default_bus_match_table, lookup,
470 parent);
471}
472EXPORT_SYMBOL_GPL(of_platform_default_populate);
473
474static int of_platform_device_destroy(struct device *dev, void *data)
475{
476 /* Do not touch devices not populated from the device tree */
477 if (!dev->of_node || !of_node_check_flag(dev->of_node, OF_POPULATED))
478 return 0;
479
480 /* Recurse for any nodes that were treated as busses */
481 if (of_node_check_flag(dev->of_node, OF_POPULATED_BUS))
482 device_for_each_child(dev, NULL, of_platform_device_destroy);
483
484 if (dev->bus == &platform_bus_type)
485 platform_device_unregister(to_platform_device(dev));
486#ifdef CONFIG_ARM_AMBA
487 else if (dev->bus == &amba_bustype)
488 amba_device_unregister(to_amba_device(dev));
489#endif
490
491 of_dma_deconfigure(dev);
492 of_node_clear_flag(dev->of_node, OF_POPULATED);
493 of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);
494 return 0;
495}
496
497/**
498 * of_platform_depopulate() - Remove devices populated from device tree
499 * @parent: device which children will be removed
500 *
501 * Complementary to of_platform_populate(), this function removes children
502 * of the given device (and, recurrently, their children) that have been
503 * created from their respective device tree nodes (and only those,
504 * leaving others - eg. manually created - unharmed).
505 *
506 * Returns 0 when all children devices have been removed or
507 * -EBUSY when some children remained.
508 */
509void of_platform_depopulate(struct device *parent)
510{
511 if (parent->of_node && of_node_check_flag(parent->of_node, OF_POPULATED_BUS)) {
512 device_for_each_child(parent, NULL, of_platform_device_destroy);
513 of_node_clear_flag(parent->of_node, OF_POPULATED_BUS);
514 }
515}
516EXPORT_SYMBOL_GPL(of_platform_depopulate);
517
518#ifdef CONFIG_OF_DYNAMIC
519static int of_platform_notify(struct notifier_block *nb,
520 unsigned long action, void *arg)
521{
522 struct of_reconfig_data *rd = arg;
523 struct platform_device *pdev_parent, *pdev;
524 bool children_left;
525
526 switch (of_reconfig_get_state_change(action, rd)) {
527 case OF_RECONFIG_CHANGE_ADD:
528 /* verify that the parent is a bus */
529 if (!of_node_check_flag(rd->dn->parent, OF_POPULATED_BUS))
530 return NOTIFY_OK; /* not for us */
531
532 /* already populated? (driver using of_populate manually) */
533 if (of_node_check_flag(rd->dn, OF_POPULATED))
534 return NOTIFY_OK;
535
536 /* pdev_parent may be NULL when no bus platform device */
537 pdev_parent = of_find_device_by_node(rd->dn->parent);
538 pdev = of_platform_device_create(rd->dn, NULL,
539 pdev_parent ? &pdev_parent->dev : NULL);
540 of_dev_put(pdev_parent);
541
542 if (pdev == NULL) {
543 pr_err("%s: failed to create for '%s'\n",
544 __func__, rd->dn->full_name);
545 /* of_platform_device_create tosses the error code */
546 return notifier_from_errno(-EINVAL);
547 }
548 break;
549
550 case OF_RECONFIG_CHANGE_REMOVE:
551
552 /* already depopulated? */
553 if (!of_node_check_flag(rd->dn, OF_POPULATED))
554 return NOTIFY_OK;
555
556 /* find our device by node */
557 pdev = of_find_device_by_node(rd->dn);
558 if (pdev == NULL)
559 return NOTIFY_OK; /* no? not meant for us */
560
561 /* unregister takes one ref away */
562 of_platform_device_destroy(&pdev->dev, &children_left);
563
564 /* and put the reference of the find */
565 of_dev_put(pdev);
566 break;
567 }
568
569 return NOTIFY_OK;
570}
571
572static struct notifier_block platform_of_notifier = {
573 .notifier_call = of_platform_notify,
574};
575
576void of_platform_register_reconfig_notifier(void)
577{
578 WARN_ON(of_reconfig_notifier_register(&platform_of_notifier));
579}
580#endif /* CONFIG_OF_DYNAMIC */
581
582#endif /* CONFIG_OF_ADDRESS */