[deliverable/linux.git] / arch / powerpc / kernel / of_platform.c

/*
 *    Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
 *			 <benh@kernel.crashing.org>
 *    and		 Arnd Bergmann, IBM Corp.
 *
 *  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 <linux/pci.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>

#include <asm/errno.h>
#include <asm/topology.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
#include <asm/atomic.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", },
	{ .type = "ebc", },
	{},
};

struct bus_type of_platform_bus_type = {
       .uevent	= of_device_uevent,
};
EXPORT_SYMBOL(of_platform_bus_type);

static int __init of_bus_driver_init(void)
{
	return of_bus_type_init(&of_platform_bus_type, "of_platform");
}

postcore_initcall(of_bus_driver_init);

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

	dev = of_device_alloc(np, bus_id, parent);
	if (!dev)
		return NULL;

	dev->dma_mask = 0xffffffffUL;
	dev->dev.bus = &of_platform_bus_type;

	/* 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 (of_device_register(dev) != 0) {
		of_device_free(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);


#ifdef CONFIG_PPC_OF_PLATFORM_PCI

/* The probing of PCI controllers from of_platform is currently
 * 64 bits only, mostly due to gratuitous differences between
 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
 * lacking some bits needed here.
 */

static int __devinit of_pci_phb_probe(struct of_device *dev,
				      const struct of_device_id *match)
{
	struct pci_controller *phb;

	/* Check if we can do that ... */
	if (ppc_md.pci_setup_phb == NULL)
		return -ENODEV;

	printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);

	/* Alloc and setup PHB data structure */
	phb = pcibios_alloc_controller(dev->node);
	if (!phb)
		return -ENODEV;

	/* Setup parent in sysfs */
	phb->parent = &dev->dev;

	/* Setup the PHB using arch provided callback */
	if (ppc_md.pci_setup_phb(phb)) {
		pcibios_free_controller(phb);
		return -ENODEV;
	}

	/* Process "ranges" property */
	pci_process_bridge_OF_ranges(phb, dev->node, 0);

	/* Init pci_dn data structures */
	pci_devs_phb_init_dynamic(phb);

	/* Register devices with EEH */
#ifdef CONFIG_EEH
	if (dev->node->child)
		eeh_add_device_tree_early(dev->node);
#endif /* CONFIG_EEH */

	/* Scan the bus */
	scan_phb(phb);

	/* Claim resources. This might need some rework as well depending
	 * wether we are doing probe-only or not, like assigning unassigned
	 * resources etc...
	 */
	pcibios_claim_one_bus(phb->bus);

	/* Finish EEH setup */
#ifdef CONFIG_EEH
	eeh_add_device_tree_late(phb->bus);
#endif

	/* Add probed PCI devices to the device model */
	pci_bus_add_devices(phb->bus);

	return 0;
}

static struct of_device_id of_pci_phb_ids[] = {
	{ .type = "pci", },
	{ .type = "pcix", },
	{ .type = "pcie", },
	{ .type = "pciex", },
	{ .type = "ht", },
	{}
};

static struct of_platform_driver of_pci_phb_driver = {
	.match_table = of_pci_phb_ids,
	.probe = of_pci_phb_probe,
	.driver = {
		.name = "of-pci",
	},
};

static __init int of_pci_phb_init(void)
{
	return of_register_platform_driver(&of_pci_phb_driver);
}

device_initcall(of_pci_phb_init);

#endif /* CONFIG_PPC_OF_PLATFORM_PCI */
Commit	Line	Data
7eebde70 BH	1	/*
	2	* Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
	3	* <benh@kernel.crashing.org>
4c9d2800	4	* and Arnd Bergmann, IBM Corp.
7eebde70 BH	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*
	11	*/
	12
	13	#undef DEBUG
	14
	15	#include <linux/string.h>
	16	#include <linux/kernel.h>
	17	#include <linux/init.h>
	18	#include <linux/module.h>
	19	#include <linux/mod_devicetable.h>
	20	#include <linux/slab.h>
4c9d2800	21	#include <linux/pci.h>
cd6eed37 SR	22	#include <linux/of_device.h>
cd6eed37 SR	23	#include <linux/of_platform.h>
7eebde70 BH	24
7eebde70 BH	25	#include <asm/errno.h>
12d04eef	26	#include <asm/topology.h>
4c9d2800 BH	27	#include <asm/pci-bridge.h>
4c9d2800 BH	28	#include <asm/ppc-pci.h>
9309180f BH	29	#include <asm/atomic.h>
9309180f BH	30
7eebde70 BH	31	/*
	32	* The list of OF IDs below is used for matching bus types in the
	33	* system whose devices are to be exposed as of_platform_devices.
	34	*
	35	* This is the default list valid for most platforms. This file provides
	36	* functions who can take an explicit list if necessary though
	37	*
	38	* The search is always performed recursively looking for children of
	39	* the provided device_node and recursively if such a children matches
	40	* a bus type in the list
	41	*/
	42
	43	static struct of_device_id of_default_bus_ids[] = {
	44	{ .type = "soc", },
	45	{ .compatible = "soc", },
	46	{ .type = "spider", },
	47	{ .type = "axon", },
	48	{ .type = "plb5", },
	49	{ .type = "plb4", },
	50	{ .type = "opb", },
4bc19626	51	{ .type = "ebc", },
7eebde70 BH	52	{},
	53	};
	54
7eebde70	55	struct bus_type of_platform_bus_type = {
1f9209cf	56	.uevent = of_device_uevent,
7eebde70 BH	57	};
	58	EXPORT_SYMBOL(of_platform_bus_type);
	59
	60	static int __init of_bus_driver_init(void)
	61	{
3f23de10	62	return of_bus_type_init(&of_platform_bus_type, "of_platform");
7eebde70 BH	63	}
	64
	65	postcore_initcall(of_bus_driver_init);
	66
7eebde70 BH	67	struct of_device* of_platform_device_create(struct device_node *np,
	68	const char *bus_id,
	69	struct device *parent)
	70	{
	71	struct of_device *dev;
	72
fec738dd	73	dev = of_device_alloc(np, bus_id, parent);
7eebde70 BH	74	if (!dev)
7eebde70 BH	75	return NULL;
7eebde70	76
7eebde70	77	dev->dma_mask = 0xffffffffUL;
7eebde70	78	dev->dev.bus = &of_platform_bus_type;
12d04eef BH	79
	80	/* We do not fill the DMA ops for platform devices by default.
	81	* This is currently the responsibility of the platform code
	82	* to do such, possibly using a device notifier
	83	*/
7eebde70	84
7eebde70	85	if (of_device_register(dev) != 0) {
fec738dd	86	of_device_free(dev);
7eebde70 BH	87	return NULL;
	88	}
	89
	90	return dev;
	91	}
	92	EXPORT_SYMBOL(of_platform_device_create);
	93
	94
	95
	96	/**
	97	* of_platform_bus_create - Create an OF device for a bus node and all its
	98	* children. Optionally recursively instanciate matching busses.
	99	* @bus: device node of the bus to instanciate
	100	* @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
	101	* disallow recursive creation of child busses
	102	*/
	103	static int of_platform_bus_create(struct device_node *bus,
	104	struct of_device_id *matches,
	105	struct device *parent)
	106	{
	107	struct device_node *child;
	108	struct of_device *dev;
	109	int rc = 0;
	110
	111	for (child = NULL; (child = of_get_next_child(bus, child)); ) {
	112	pr_debug(" create child: %s\n", child->full_name);
	113	dev = of_platform_device_create(child, NULL, parent);
	114	if (dev == NULL)
	115	rc = -ENOMEM;
	116	else if (!of_match_node(matches, child))
	117	continue;
	118	if (rc == 0) {
	119	pr_debug(" and sub busses\n");
	120	rc = of_platform_bus_create(child, matches, &dev->dev);
	121	} if (rc) {
	122	of_node_put(child);
	123	break;
	124	}
	125	}
	126	return rc;
	127	}
	128
	129	/**
	130	* of_platform_bus_probe - Probe the device-tree for platform busses
	131	* @root: parent of the first level to probe or NULL for the root of the tree
	132	* @matches: match table, NULL to use the default
	133	* @parent: parent to hook devices from, NULL for toplevel
	134	*
	135	* Note that children of the provided root are not instanciated as devices
	136	* unless the specified root itself matches the bus list and is not NULL.
	137	*/
	138
	139	int of_platform_bus_probe(struct device_node *root,
	140	struct of_device_id *matches,
	141	struct device *parent)
	142	{
	143	struct device_node *child;
	144	struct of_device *dev;
	145	int rc = 0;
	146
	147	if (matches == NULL)
	148	matches = of_default_bus_ids;
	149	if (matches == OF_NO_DEEP_PROBE)
	150	return -EINVAL;
151	if (root == NULL)
152	root = of_find_node_by_path("/");
153	else
154	of_node_get(root);
155
156	pr_debug("of_platform_bus_probe()\n");
157	pr_debug(" starting at: %s\n", root->full_name);
158
159	/* Do a self check of bus type, if there's a match, create
160	* children
161	*/
162	if (of_match_node(matches, root)) {
163	pr_debug(" root match, create all sub devices\n");
164	dev = of_platform_device_create(root, NULL, parent);
165	if (dev == NULL) {
166	rc = -ENOMEM;
167	goto bail;
168	}
169	pr_debug(" create all sub busses\n");
170	rc = of_platform_bus_create(root, matches, &dev->dev);
171	goto bail;
172	}
173	for (child = NULL; (child = of_get_next_child(root, child)); ) {
174	if (!of_match_node(matches, child))
175	continue;
176
177	pr_debug(" match: %s\n", child->full_name);
178	dev = of_platform_device_create(child, NULL, parent);
179	if (dev == NULL)
180	rc = -ENOMEM;
181	else
182	rc = of_platform_bus_create(child, matches, &dev->dev);
183	if (rc) {
184	of_node_put(child);
185	break;
186	}
187	}
188	bail:
189	of_node_put(root);
190	return rc;
191	}
192	EXPORT_SYMBOL(of_platform_bus_probe);
193
194	static int of_dev_node_match(struct device dev, void data)
195	{
196	return to_of_device(dev)->node == data;
197	}
198
199	struct of_device of_find_device_by_node(struct device_node np)
200	{
201	struct device *dev;
202
203	dev = bus_find_device(&of_platform_bus_type,
204	NULL, np, of_dev_node_match);
205	if (dev)
206	return to_of_device(dev);
207	return NULL;
208	}
209	EXPORT_SYMBOL(of_find_device_by_node);
210
211	static int of_dev_phandle_match(struct device dev, void data)
212	{
213	phandle *ph = data;
214	return to_of_device(dev)->node->linux_phandle == *ph;
215	}
216
217	struct of_device *of_find_device_by_phandle(phandle ph)
218	{
219	struct device *dev;
220
221	dev = bus_find_device(&of_platform_bus_type,
222	NULL, &ph, of_dev_phandle_match);
223	if (dev)
224	return to_of_device(dev);
225	return NULL;
226	}
227	EXPORT_SYMBOL(of_find_device_by_phandle);
4c9d2800 BH	228
	229
	230	#ifdef CONFIG_PPC_OF_PLATFORM_PCI
	231
	232	/* The probing of PCI controllers from of_platform is currently
	233	* 64 bits only, mostly due to gratuitous differences between
	234	* the 32 and 64 bits PCI code on PowerPC and the 32 bits one
	235	* lacking some bits needed here.
	236	*/
	237
	238	static int __devinit of_pci_phb_probe(struct of_device *dev,
	239	const struct of_device_id *match)
	240	{
	241	struct pci_controller *phb;
	242
	243	/* Check if we can do that ... */
	244	if (ppc_md.pci_setup_phb == NULL)
	245	return -ENODEV;
	246
	247	printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);
	248
	249	/* Alloc and setup PHB data structure */
	250	phb = pcibios_alloc_controller(dev->node);
	251	if (!phb)
	252	return -ENODEV;
	253
	254	/* Setup parent in sysfs */
	255	phb->parent = &dev->dev;
	256
	257	/* Setup the PHB using arch provided callback */
	258	if (ppc_md.pci_setup_phb(phb)) {
	259	pcibios_free_controller(phb);
	260	return -ENODEV;
	261	}
	262
	263	/* Process "ranges" property */
	264	pci_process_bridge_OF_ranges(phb, dev->node, 0);
	265
4c9d2800 BH	266	/* Init pci_dn data structures */
	267	pci_devs_phb_init_dynamic(phb);
	268
	269	/* Register devices with EEH */
	270	#ifdef CONFIG_EEH
	271	if (dev->node->child)
	272	eeh_add_device_tree_early(dev->node);
	273	#endif /* CONFIG_EEH */
	274
	275	/* Scan the bus */
	276	scan_phb(phb);
	277
	278	/* Claim resources. This might need some rework as well depending
	279	* wether we are doing probe-only or not, like assigning unassigned
	280	* resources etc...
	281	*/
	282	pcibios_claim_one_bus(phb->bus);
	283
	284	/* Finish EEH setup */
	285	#ifdef CONFIG_EEH
	286	eeh_add_device_tree_late(phb->bus);
	287	#endif
	288
	289	/* Add probed PCI devices to the device model */
	290	pci_bus_add_devices(phb->bus);
	291
	292	return 0;
	293	}
	294
	295	static struct of_device_id of_pci_phb_ids[] = {
	296	{ .type = "pci", },
	297	{ .type = "pcix", },
	298	{ .type = "pcie", },
	299	{ .type = "pciex", },
	300	{ .type = "ht", },
	301	{}
	302	};
	303
	304	static struct of_platform_driver of_pci_phb_driver = {
cd6eed37 SR	305	.match_table = of_pci_phb_ids,
	306	.probe = of_pci_phb_probe,
	307	.driver = {
	308	.name = "of-pci",
	309	},
4c9d2800 BH	310	};
	311
	312	static __init int of_pci_phb_init(void)
	313	{
	314	return of_register_platform_driver(&of_pci_phb_driver);
	315	}
	316
	317	device_initcall(of_pci_phb_init);
	318
	319	#endif /* CONFIG_PPC_OF_PLATFORM_PCI */