[linux-2.6-block.git] / arch / powerpc / kernel / of_platform.c

/*
 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
 *			 <benh@kernel.crashing.org>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#undef DEBUG

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>

#include <asm/errno.h>
#include <asm/dcr.h>
#include <asm/of_device.h>
#include <asm/of_platform.h>
#include <asm/topology.h>

/*
 * The list of OF IDs below is used for matching bus types in the
 * system whose devices are to be exposed as of_platform_devices.
 *
 * This is the default list valid for most platforms. This file provides
 * functions who can take an explicit list if necessary though
 *
 * The search is always performed recursively looking for children of
 * the provided device_node and recursively if such a children matches
 * a bus type in the list
 */

static struct of_device_id of_default_bus_ids[] = {
	{ .type = "soc", },
	{ .compatible = "soc", },
	{ .type = "spider", },
	{ .type = "axon", },
	{ .type = "plb5", },
	{ .type = "plb4", },
	{ .type = "opb", },
	{},
};

/*
 *
 * OF platform device type definition & base infrastructure
 *
 */

static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
{
	struct of_device * of_dev = to_of_device(dev);
	struct of_platform_driver * of_drv = to_of_platform_driver(drv);
	const struct of_device_id * matches = of_drv->match_table;

	if (!matches)
		return 0;

	return of_match_device(matches, of_dev) != NULL;
}

static int of_platform_device_probe(struct device *dev)
{
	int error = -ENODEV;
	struct of_platform_driver *drv;
	struct of_device *of_dev;
	const struct of_device_id *match;

	drv = to_of_platform_driver(dev->driver);
	of_dev = to_of_device(dev);

	if (!drv->probe)
		return error;

	of_dev_get(of_dev);

	match = of_match_device(drv->match_table, of_dev);
	if (match)
		error = drv->probe(of_dev, match);
	if (error)
		of_dev_put(of_dev);

	return error;
}

static int of_platform_device_remove(struct device *dev)
{
	struct of_device * of_dev = to_of_device(dev);
	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);

	if (dev->driver && drv->remove)
		drv->remove(of_dev);
	return 0;
}

static int of_platform_device_suspend(struct device *dev, pm_message_t state)
{
	struct of_device * of_dev = to_of_device(dev);
	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
	int error = 0;

	if (dev->driver && drv->suspend)
		error = drv->suspend(of_dev, state);
	return error;
}

static int of_platform_device_resume(struct device * dev)
{
	struct of_device * of_dev = to_of_device(dev);
	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
	int error = 0;

	if (dev->driver && drv->resume)
		error = drv->resume(of_dev);
	return error;
}

struct bus_type of_platform_bus_type = {
       .name	= "of_platform",
       .match	= of_platform_bus_match,
       .probe	= of_platform_device_probe,
       .remove	= of_platform_device_remove,
       .suspend	= of_platform_device_suspend,
       .resume	= of_platform_device_resume,
};
EXPORT_SYMBOL(of_platform_bus_type);

static int __init of_bus_driver_init(void)
{
	return bus_register(&of_platform_bus_type);
}

postcore_initcall(of_bus_driver_init);

int of_register_platform_driver(struct of_platform_driver *drv)
{
	/* initialize common driver fields */
	drv->driver.name = drv->name;
	drv->driver.bus = &of_platform_bus_type;

	/* register with core */
	return driver_register(&drv->driver);
}
EXPORT_SYMBOL(of_register_platform_driver);

void of_unregister_platform_driver(struct of_platform_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(of_unregister_platform_driver);

static void of_platform_make_bus_id(struct of_device *dev)
{
	struct device_node *node = dev->node;
	char *name = dev->dev.bus_id;
	const u32 *reg;
	u64 addr;

	/*
	 * If it's a DCR based device, use 'd' for native DCRs
	 * and 'D' for MMIO DCRs.
	 */
#ifdef CONFIG_PPC_DCR
	reg = get_property(node, "dcr-reg", NULL);
	if (reg) {
#ifdef CONFIG_PPC_DCR_NATIVE
		snprintf(name, BUS_ID_SIZE, "d%x.%s",
			 *reg, node->name);
#else /* CONFIG_PPC_DCR_NATIVE */
		addr = of_translate_dcr_address(node, *reg, NULL);
		if (addr != OF_BAD_ADDR) {
			snprintf(name, BUS_ID_SIZE,
				 "D%llx.%s", (unsigned long long)addr,
				 node->name);
			return;
		}
#endif /* !CONFIG_PPC_DCR_NATIVE */
	}
#endif /* CONFIG_PPC_DCR */

	/*
	 * For MMIO, get the physical address
	 */
	reg = get_property(node, "reg", NULL);
	if (reg) {
		addr = of_translate_address(node, reg);
		if (addr != OF_BAD_ADDR) {
			snprintf(name, BUS_ID_SIZE,
				 "%llx.%s", (unsigned long long)addr,
				 node->name);
			return;
		}
	}

	/*
	 * No BusID, use the node name and pray
	 */
	snprintf(name, BUS_ID_SIZE, "%s", node->name);
}

struct of_device* of_platform_device_create(struct device_node *np,
					    const char *bus_id,
					    struct device *parent)
{
	struct of_device *dev;

	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return NULL;
	memset(dev, 0, sizeof(*dev));

	dev->node = of_node_get(np);
	dev->dma_mask = 0xffffffffUL;
	dev->dev.dma_mask = &dev->dma_mask;
	dev->dev.parent = parent;
	dev->dev.bus = &of_platform_bus_type;
	dev->dev.release = of_release_dev;
	dev->dev.archdata.of_node = np;
	dev->dev.archdata.numa_node = of_node_to_nid(np);

	/* We do not fill the DMA ops for platform devices by default.
	 * This is currently the responsibility of the platform code
	 * to do such, possibly using a device notifier
	 */

	if (bus_id)
		strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
	else
		of_platform_make_bus_id(dev);

	if (of_device_register(dev) != 0) {
		kfree(dev);
		return NULL;
	}

	return dev;
}
EXPORT_SYMBOL(of_platform_device_create);


/**
 * of_platform_bus_create - Create an OF device for a bus node and all its
 * children. Optionally recursively instanciate matching busses.
 * @bus: device node of the bus to instanciate
 * @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
 * disallow recursive creation of child busses
 */
static int of_platform_bus_create(struct device_node *bus,
				  struct of_device_id *matches,
				  struct device *parent)
{
	struct device_node *child;
	struct of_device *dev;
	int rc = 0;

	for (child = NULL; (child = of_get_next_child(bus, child)); ) {
		pr_debug("   create child: %s\n", child->full_name);
		dev = of_platform_device_create(child, NULL, parent);
		if (dev == NULL)
			rc = -ENOMEM;
		else if (!of_match_node(matches, child))
			continue;
		if (rc == 0) {
			pr_debug("   and sub busses\n");
			rc = of_platform_bus_create(child, matches, &dev->dev);
		} if (rc) {
			of_node_put(child);
			break;
		}
	}
	return rc;
}

/**
 * of_platform_bus_probe - Probe the device-tree for platform busses
 * @root: parent of the first level to probe or NULL for the root of the tree
 * @matches: match table, NULL to use the default
 * @parent: parent to hook devices from, NULL for toplevel
 *
 * Note that children of the provided root are not instanciated as devices
 * unless the specified root itself matches the bus list and is not NULL.
 */

int of_platform_bus_probe(struct device_node *root,
			  struct of_device_id *matches,
			  struct device *parent)
{
	struct device_node *child;
	struct of_device *dev;
	int rc = 0;

	if (matches == NULL)
		matches = of_default_bus_ids;
	if (matches == OF_NO_DEEP_PROBE)
		return -EINVAL;
	if (root == NULL)
		root = of_find_node_by_path("/");
	else
		of_node_get(root);

	pr_debug("of_platform_bus_probe()\n");
	pr_debug(" starting at: %s\n", root->full_name);

	/* Do a self check of bus type, if there's a match, create
	 * children
	 */
	if (of_match_node(matches, root)) {
		pr_debug(" root match, create all sub devices\n");
		dev = of_platform_device_create(root, NULL, parent);
		if (dev == NULL) {
			rc = -ENOMEM;
			goto bail;
		}
		pr_debug(" create all sub busses\n");
		rc = of_platform_bus_create(root, matches, &dev->dev);
		goto bail;
	}
	for (child = NULL; (child = of_get_next_child(root, child)); ) {
		if (!of_match_node(matches, child))
			continue;

		pr_debug("  match: %s\n", child->full_name);
		dev = of_platform_device_create(child, NULL, parent);
		if (dev == NULL)
			rc = -ENOMEM;
		else
			rc = of_platform_bus_create(child, matches, &dev->dev);
		if (rc) {
			of_node_put(child);
			break;
		}
	}
 bail:
	of_node_put(root);
	return rc;
}
EXPORT_SYMBOL(of_platform_bus_probe);

static int of_dev_node_match(struct device *dev, void *data)
{
	return to_of_device(dev)->node == data;
}

struct of_device *of_find_device_by_node(struct device_node *np)
{
	struct device *dev;

	dev = bus_find_device(&of_platform_bus_type,
			      NULL, np, of_dev_node_match);
	if (dev)
		return to_of_device(dev);
	return NULL;
}
EXPORT_SYMBOL(of_find_device_by_node);

static int of_dev_phandle_match(struct device *dev, void *data)
{
	phandle *ph = data;
	return to_of_device(dev)->node->linux_phandle == *ph;
}

struct of_device *of_find_device_by_phandle(phandle ph)
{
	struct device *dev;

	dev = bus_find_device(&of_platform_bus_type,
			      NULL, &ph, of_dev_phandle_match);
	if (dev)
		return to_of_device(dev);
	return NULL;
}
EXPORT_SYMBOL(of_find_device_by_phandle);
Commit	Line	Data
7eebde70 BH	1	/*
	2	* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
	3	* <benh@kernel.crashing.org>
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License
	7	* as published by the Free Software Foundation; either version
	8	* 2 of the License, or (at your option) any later version.
	9	*
	10	*/
	11
	12	#undef DEBUG
	13
	14	#include <linux/string.h>
	15	#include <linux/kernel.h>
	16	#include <linux/init.h>
	17	#include <linux/module.h>
	18	#include <linux/mod_devicetable.h>
	19	#include <linux/slab.h>
	20
	21	#include <asm/errno.h>
	22	#include <asm/dcr.h>
	23	#include <asm/of_device.h>
	24	#include <asm/of_platform.h>
12d04eef	25	#include <asm/topology.h>
7eebde70 BH	26
	27	/*
	28	* The list of OF IDs below is used for matching bus types in the
	29	* system whose devices are to be exposed as of_platform_devices.
	30	*
	31	* This is the default list valid for most platforms. This file provides
	32	* functions who can take an explicit list if necessary though
	33	*
	34	* The search is always performed recursively looking for children of
	35	* the provided device_node and recursively if such a children matches
	36	* a bus type in the list
	37	*/
	38
	39	static struct of_device_id of_default_bus_ids[] = {
	40	{ .type = "soc", },
	41	{ .compatible = "soc", },
	42	{ .type = "spider", },
	43	{ .type = "axon", },
	44	{ .type = "plb5", },
	45	{ .type = "plb4", },
	46	{ .type = "opb", },
	47	{},
	48	};
	49
	50	/*
	51	*
	52	* OF platform device type definition & base infrastructure
	53	*
	54	*/
	55
	56	static int of_platform_bus_match(struct device dev, struct device_driver drv)
	57	{
	58	struct of_device * of_dev = to_of_device(dev);
	59	struct of_platform_driver * of_drv = to_of_platform_driver(drv);
	60	const struct of_device_id * matches = of_drv->match_table;
	61
	62	if (!matches)
	63	return 0;
	64
	65	return of_match_device(matches, of_dev) != NULL;
	66	}
	67
	68	static int of_platform_device_probe(struct device *dev)
	69	{
	70	int error = -ENODEV;
	71	struct of_platform_driver *drv;
	72	struct of_device *of_dev;
	73	const struct of_device_id *match;
	74
	75	drv = to_of_platform_driver(dev->driver);
	76	of_dev = to_of_device(dev);
	77
	78	if (!drv->probe)
	79	return error;
	80
	81	of_dev_get(of_dev);
	82
	83	match = of_match_device(drv->match_table, of_dev);
	84	if (match)
	85	error = drv->probe(of_dev, match);
	86	if (error)
	87	of_dev_put(of_dev);
	88
	89	return error;
90	}
91
92	static int of_platform_device_remove(struct device *dev)
93	{
94	struct of_device * of_dev = to_of_device(dev);
95	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
96
97	if (dev->driver && drv->remove)
98	drv->remove(of_dev);
99	return 0;
100	}
101
102	static int of_platform_device_suspend(struct device *dev, pm_message_t state)
103	{
104	struct of_device * of_dev = to_of_device(dev);
105	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
106	int error = 0;
107
108	if (dev->driver && drv->suspend)
109	error = drv->suspend(of_dev, state);
110	return error;
111	}
112
113	static int of_platform_device_resume(struct device * dev)
114	{
115	struct of_device * of_dev = to_of_device(dev);
116	struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
117	int error = 0;
118
119	if (dev->driver && drv->resume)
120	error = drv->resume(of_dev);
121	return error;
122	}
123
124	struct bus_type of_platform_bus_type = {
125	.name = "of_platform",
126	.match = of_platform_bus_match,
127	.probe = of_platform_device_probe,
128	.remove = of_platform_device_remove,
129	.suspend = of_platform_device_suspend,
130	.resume = of_platform_device_resume,
131	};
132	EXPORT_SYMBOL(of_platform_bus_type);
133
134	static int __init of_bus_driver_init(void)
135	{
136	return bus_register(&of_platform_bus_type);
137	}
138
139	postcore_initcall(of_bus_driver_init);
140
141	int of_register_platform_driver(struct of_platform_driver *drv)
142	{
143	/* initialize common driver fields */
144	drv->driver.name = drv->name;
145	drv->driver.bus = &of_platform_bus_type;
146
147	/* register with core */
148	return driver_register(&drv->driver);
149	}
150	EXPORT_SYMBOL(of_register_platform_driver);
151
152	void of_unregister_platform_driver(struct of_platform_driver *drv)
153	{
154	driver_unregister(&drv->driver);
155	}
156	EXPORT_SYMBOL(of_unregister_platform_driver);
157
158	static void of_platform_make_bus_id(struct of_device *dev)
159	{
160	struct device_node *node = dev->node;
161	char *name = dev->dev.bus_id;
162	const u32 *reg;
163	u64 addr;
164
165	/*
166	* If it's a DCR based device, use 'd' for native DCRs
167	* and 'D' for MMIO DCRs.
168	*/
169	#ifdef CONFIG_PPC_DCR
170	reg = get_property(node, "dcr-reg", NULL);
171	if (reg) {
172	#ifdef CONFIG_PPC_DCR_NATIVE
173	snprintf(name, BUS_ID_SIZE, "d%x.%s",
174	*reg, node->name);
175	#else /* CONFIG_PPC_DCR_NATIVE */
176	addr = of_translate_dcr_address(node, *reg, NULL);
177	if (addr != OF_BAD_ADDR) {
178	snprintf(name, BUS_ID_SIZE,
179	"D%llx.%s", (unsigned long long)addr,
180	node->name);
181	return;
182	}
183	#endif /* !CONFIG_PPC_DCR_NATIVE */
184	}
185	#endif /* CONFIG_PPC_DCR */
186
187	/*
188	* For MMIO, get the physical address
189	*/
190	reg = get_property(node, "reg", NULL);
191	if (reg) {
192	addr = of_translate_address(node, reg);
193	if (addr != OF_BAD_ADDR) {
194	snprintf(name, BUS_ID_SIZE,
195	"%llx.%s", (unsigned long long)addr,
196	node->name);
197	return;
198	}
199	}
200
201	/*
202	* No BusID, use the node name and pray
203	*/
204	snprintf(name, BUS_ID_SIZE, "%s", node->name);
205	}
206
207	struct of_device* of_platform_device_create(struct device_node *np,
208	const char *bus_id,
209	struct device *parent)
210	{
211	struct of_device *dev;
212
213	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
214	if (!dev)
215	return NULL;
216	memset(dev, 0, sizeof(*dev));
217
218	dev->node = of_node_get(np);
219	dev->dma_mask = 0xffffffffUL;
220	dev->dev.dma_mask = &dev->dma_mask;
221	dev->dev.parent = parent;
222	dev->dev.bus = &of_platform_bus_type;
223	dev->dev.release = of_release_dev;
12d04eef BH	224	dev->dev.archdata.of_node = np;
	225	dev->dev.archdata.numa_node = of_node_to_nid(np);
	226
	227	/* We do not fill the DMA ops for platform devices by default.
	228	* This is currently the responsibility of the platform code
	229	* to do such, possibly using a device notifier
	230	*/
7eebde70 BH	231
	232	if (bus_id)
	233	strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
	234	else
	235	of_platform_make_bus_id(dev);
	236
	237	if (of_device_register(dev) != 0) {
	238	kfree(dev);
	239	return NULL;
	240	}
	241
	242	return dev;
	243	}
	244	EXPORT_SYMBOL(of_platform_device_create);
	245
	246
	247
	248	/**
	249	* of_platform_bus_create - Create an OF device for a bus node and all its
	250	* children. Optionally recursively instanciate matching busses.
	251	* @bus: device node of the bus to instanciate
	252	* @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
	253	* disallow recursive creation of child busses
	254	*/
	255	static int of_platform_bus_create(struct device_node *bus,
	256	struct of_device_id *matches,
	257	struct device *parent)
	258	{
	259	struct device_node *child;
	260	struct of_device *dev;
	261	int rc = 0;
	262
	263	for (child = NULL; (child = of_get_next_child(bus, child)); ) {
	264	pr_debug(" create child: %s\n", child->full_name);
	265	dev = of_platform_device_create(child, NULL, parent);
	266	if (dev == NULL)
	267	rc = -ENOMEM;
	268	else if (!of_match_node(matches, child))
	269	continue;
	270	if (rc == 0) {
	271	pr_debug(" and sub busses\n");
	272	rc = of_platform_bus_create(child, matches, &dev->dev);
	273	} if (rc) {
	274	of_node_put(child);
	275	break;
	276	}
	277	}
	278	return rc;
	279	}
	280
	281	/**
	282	* of_platform_bus_probe - Probe the device-tree for platform busses
	283	* @root: parent of the first level to probe or NULL for the root of the tree
	284	* @matches: match table, NULL to use the default
	285	* @parent: parent to hook devices from, NULL for toplevel
	286	*
	287	* Note that children of the provided root are not instanciated as devices
	288	* unless the specified root itself matches the bus list and is not NULL.
	289	*/
	290
	291	int of_platform_bus_probe(struct device_node *root,
	292	struct of_device_id *matches,
	293	struct device *parent)
	294	{
295	struct device_node *child;
296	struct of_device *dev;
297	int rc = 0;
298
299	if (matches == NULL)
300	matches = of_default_bus_ids;
301	if (matches == OF_NO_DEEP_PROBE)
302	return -EINVAL;
303	if (root == NULL)
304	root = of_find_node_by_path("/");
305	else
306	of_node_get(root);
307
308	pr_debug("of_platform_bus_probe()\n");
309	pr_debug(" starting at: %s\n", root->full_name);
310
311	/* Do a self check of bus type, if there's a match, create
312	* children
313	*/
314	if (of_match_node(matches, root)) {
315	pr_debug(" root match, create all sub devices\n");
316	dev = of_platform_device_create(root, NULL, parent);
317	if (dev == NULL) {
318	rc = -ENOMEM;
319	goto bail;
320	}
321	pr_debug(" create all sub busses\n");
322	rc = of_platform_bus_create(root, matches, &dev->dev);
323	goto bail;
324	}
325	for (child = NULL; (child = of_get_next_child(root, child)); ) {
326	if (!of_match_node(matches, child))
327	continue;
328
329	pr_debug(" match: %s\n", child->full_name);
330	dev = of_platform_device_create(child, NULL, parent);
331	if (dev == NULL)
332	rc = -ENOMEM;
333	else
334	rc = of_platform_bus_create(child, matches, &dev->dev);
335	if (rc) {
336	of_node_put(child);
337	break;
338	}
339	}
340	bail:
341	of_node_put(root);
342	return rc;
343	}
344	EXPORT_SYMBOL(of_platform_bus_probe);
345
346	static int of_dev_node_match(struct device dev, void data)
347	{
348	return to_of_device(dev)->node == data;
349	}
350
351	struct of_device of_find_device_by_node(struct device_node np)
352	{
353	struct device *dev;
354
355	dev = bus_find_device(&of_platform_bus_type,
356	NULL, np, of_dev_node_match);
357	if (dev)
358	return to_of_device(dev);
359	return NULL;
360	}
361	EXPORT_SYMBOL(of_find_device_by_node);
362
363	static int of_dev_phandle_match(struct device dev, void data)
364	{
365	phandle *ph = data;
366	return to_of_device(dev)->node->linux_phandle == *ph;
367	}
368
369	struct of_device *of_find_device_by_phandle(phandle ph)
370	{
371	struct device *dev;
372
373	dev = bus_find_device(&of_platform_bus_type,
374	NULL, &ph, of_dev_phandle_match);
375	if (dev)
376	return to_of_device(dev);
377	return NULL;
378	}
379	EXPORT_SYMBOL(of_find_device_by_phandle);