[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.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 const 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.coherent_dma_mask = DMA_BIT_MASK(32);

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

	for_each_child_of_node(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,
			  const 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_each_child_of_node(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);
	if (phb->bus == NULL)
		return -ENXIO;

	/* 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>
283029d1	22	#include <linux/of.h>
cd6eed37 SR	23	#include <linux/of_device.h>
cd6eed37 SR	24	#include <linux/of_platform.h>
7eebde70 BH	25
7eebde70 BH	26	#include <asm/errno.h>
12d04eef	27	#include <asm/topology.h>
4c9d2800 BH	28	#include <asm/pci-bridge.h>
4c9d2800 BH	29	#include <asm/ppc-pci.h>
9309180f BH	30	#include <asm/atomic.h>
9309180f BH	31
7eebde70 BH	32	/*
	33	* The list of OF IDs below is used for matching bus types in the
	34	* system whose devices are to be exposed as of_platform_devices.
	35	*
	36	* This is the default list valid for most platforms. This file provides
	37	* functions who can take an explicit list if necessary though
	38	*
	39	* The search is always performed recursively looking for children of
	40	* the provided device_node and recursively if such a children matches
	41	* a bus type in the list
	42	*/
	43
b91bdd15	44	static const struct of_device_id of_default_bus_ids[] = {
7eebde70 BH	45	{ .type = "soc", },
	46	{ .compatible = "soc", },
	47	{ .type = "spider", },
	48	{ .type = "axon", },
	49	{ .type = "plb5", },
	50	{ .type = "plb4", },
	51	{ .type = "opb", },
4bc19626	52	{ .type = "ebc", },
7eebde70 BH	53	{},
	54	};
	55
7eebde70	56	struct bus_type of_platform_bus_type = {
1f9209cf	57	.uevent = of_device_uevent,
7eebde70 BH	58	};
	59	EXPORT_SYMBOL(of_platform_bus_type);
	60
	61	static int __init of_bus_driver_init(void)
	62	{
3f23de10	63	return of_bus_type_init(&of_platform_bus_type, "of_platform");
7eebde70 BH	64	}
	65
	66	postcore_initcall(of_bus_driver_init);
	67
7eebde70 BH	68	struct of_device* of_platform_device_create(struct device_node *np,
	69	const char *bus_id,
	70	struct device *parent)
	71	{
	72	struct of_device *dev;
	73
fec738dd	74	dev = of_device_alloc(np, bus_id, parent);
7eebde70 BH	75	if (!dev)
7eebde70 BH	76	return NULL;
7eebde70	77
7eebde70	78	dev->dma_mask = 0xffffffffUL;
284901a9	79	dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
ba0fc709	80
7eebde70	81	dev->dev.bus = &of_platform_bus_type;
12d04eef BH	82
	83	/* We do not fill the DMA ops for platform devices by default.
	84	* This is currently the responsibility of the platform code
	85	* to do such, possibly using a device notifier
	86	*/
7eebde70	87
7eebde70	88	if (of_device_register(dev) != 0) {
fec738dd	89	of_device_free(dev);
7eebde70 BH	90	return NULL;
	91	}
	92
	93	return dev;
	94	}
	95	EXPORT_SYMBOL(of_platform_device_create);
	96
	97
	98
	99	/**
	100	* of_platform_bus_create - Create an OF device for a bus node and all its
	101	* children. Optionally recursively instanciate matching busses.
	102	* @bus: device node of the bus to instanciate
	103	* @matches: match table, NULL to use the default, OF_NO_DEEP_PROBE to
	104	* disallow recursive creation of child busses
	105	*/
b91bdd15 SR	106	static int of_platform_bus_create(const struct device_node *bus,
b91bdd15 SR	107	const struct of_device_id *matches,
7eebde70 BH	108	struct device *parent)
	109	{
	110	struct device_node *child;
	111	struct of_device *dev;
	112	int rc = 0;
	113
85e99b9f	114	for_each_child_of_node(bus, child) {
7eebde70 BH	115	pr_debug(" create child: %s\n", child->full_name);
	116	dev = of_platform_device_create(child, NULL, parent);
	117	if (dev == NULL)
	118	rc = -ENOMEM;
	119	else if (!of_match_node(matches, child))
	120	continue;
	121	if (rc == 0) {
	122	pr_debug(" and sub busses\n");
	123	rc = of_platform_bus_create(child, matches, &dev->dev);
	124	} if (rc) {
	125	of_node_put(child);
	126	break;
	127	}
	128	}
	129	return rc;
	130	}
	131
	132	/**
	133	* of_platform_bus_probe - Probe the device-tree for platform busses
	134	* @root: parent of the first level to probe or NULL for the root of the tree
	135	* @matches: match table, NULL to use the default
	136	* @parent: parent to hook devices from, NULL for toplevel
	137	*
	138	* Note that children of the provided root are not instanciated as devices
	139	* unless the specified root itself matches the bus list and is not NULL.
	140	*/
	141
	142	int of_platform_bus_probe(struct device_node *root,
b91bdd15	143	const struct of_device_id *matches,
7eebde70 BH	144	struct device *parent)
	145	{
	146	struct device_node *child;
	147	struct of_device *dev;
	148	int rc = 0;
	149
	150	if (matches == NULL)
	151	matches = of_default_bus_ids;
	152	if (matches == OF_NO_DEEP_PROBE)
	153	return -EINVAL;
	154	if (root == NULL)
	155	root = of_find_node_by_path("/");
	156	else
	157	of_node_get(root);
	158
	159	pr_debug("of_platform_bus_probe()\n");
	160	pr_debug(" starting at: %s\n", root->full_name);
	161
	162	/* Do a self check of bus type, if there's a match, create
	163	* children
	164	*/
	165	if (of_match_node(matches, root)) {
	166	pr_debug(" root match, create all sub devices\n");
	167	dev = of_platform_device_create(root, NULL, parent);
	168	if (dev == NULL) {
	169	rc = -ENOMEM;
	170	goto bail;
	171	}
	172	pr_debug(" create all sub busses\n");
	173	rc = of_platform_bus_create(root, matches, &dev->dev);
	174	goto bail;
	175	}
85e99b9f	176	for_each_child_of_node(root, child) {
7eebde70 BH	177	if (!of_match_node(matches, child))
	178	continue;
	179
	180	pr_debug(" match: %s\n", child->full_name);
	181	dev = of_platform_device_create(child, NULL, parent);
	182	if (dev == NULL)
	183	rc = -ENOMEM;
	184	else
	185	rc = of_platform_bus_create(child, matches, &dev->dev);
	186	if (rc) {
	187	of_node_put(child);
	188	break;
	189	}
	190	}
	191	bail:
	192	of_node_put(root);
	193	return rc;
	194	}
	195	EXPORT_SYMBOL(of_platform_bus_probe);
	196
	197	static int of_dev_node_match(struct device dev, void data)
	198	{
	199	return to_of_device(dev)->node == data;
	200	}
	201
	202	struct of_device of_find_device_by_node(struct device_node np)
	203	{
	204	struct device *dev;
	205
	206	dev = bus_find_device(&of_platform_bus_type,
	207	NULL, np, of_dev_node_match);
	208	if (dev)
	209	return to_of_device(dev);
	210	return NULL;
	211	}
	212	EXPORT_SYMBOL(of_find_device_by_node);
	213
	214	static int of_dev_phandle_match(struct device dev, void data)
	215	{
	216	phandle *ph = data;
	217	return to_of_device(dev)->node->linux_phandle == *ph;
	218	}
	219
	220	struct of_device *of_find_device_by_phandle(phandle ph)
	221	{
	222	struct device *dev;
	223
	224	dev = bus_find_device(&of_platform_bus_type,
	225	NULL, &ph, of_dev_phandle_match);
	226	if (dev)
	227	return to_of_device(dev);
	228	return NULL;
	229	}
	230	EXPORT_SYMBOL(of_find_device_by_phandle);
4c9d2800 BH	231
	232
	233	#ifdef CONFIG_PPC_OF_PLATFORM_PCI
	234
	235	/* The probing of PCI controllers from of_platform is currently
	236	* 64 bits only, mostly due to gratuitous differences between
	237	* the 32 and 64 bits PCI code on PowerPC and the 32 bits one
	238	* lacking some bits needed here.
	239	*/
	240
	241	static int __devinit of_pci_phb_probe(struct of_device *dev,
	242	const struct of_device_id *match)
	243	{
	244	struct pci_controller *phb;
	245
	246	/* Check if we can do that ... */
	247	if (ppc_md.pci_setup_phb == NULL)
	248	return -ENODEV;
	249
	250	printk(KERN_INFO "Setting up PCI bus %s\n", dev->node->full_name);
	251
	252	/* Alloc and setup PHB data structure */
	253	phb = pcibios_alloc_controller(dev->node);
	254	if (!phb)
	255	return -ENODEV;
	256
	257	/* Setup parent in sysfs */
	258	phb->parent = &dev->dev;
	259
	260	/* Setup the PHB using arch provided callback */
	261	if (ppc_md.pci_setup_phb(phb)) {
	262	pcibios_free_controller(phb);
	263	return -ENODEV;
	264	}
	265
	266	/* Process "ranges" property */
	267	pci_process_bridge_OF_ranges(phb, dev->node, 0);
	268
4c9d2800 BH	269	/* Init pci_dn data structures */
	270	pci_devs_phb_init_dynamic(phb);
	271
	272	/* Register devices with EEH */
	273	#ifdef CONFIG_EEH
	274	if (dev->node->child)
	275	eeh_add_device_tree_early(dev->node);
	276	#endif /* CONFIG_EEH */
	277
	278	/* Scan the bus */
	279	scan_phb(phb);
7cfb62a2 IK	280	if (phb->bus == NULL)
7cfb62a2 IK	281	return -ENXIO;
4c9d2800 BH	282
	283	/* Claim resources. This might need some rework as well depending
	284	* wether we are doing probe-only or not, like assigning unassigned
	285	* resources etc...
	286	*/
	287	pcibios_claim_one_bus(phb->bus);
	288
	289	/* Finish EEH setup */
	290	#ifdef CONFIG_EEH
	291	eeh_add_device_tree_late(phb->bus);
	292	#endif
	293
	294	/* Add probed PCI devices to the device model */
	295	pci_bus_add_devices(phb->bus);
	296
	297	return 0;
	298	}
	299
	300	static struct of_device_id of_pci_phb_ids[] = {
	301	{ .type = "pci", },
	302	{ .type = "pcix", },
	303	{ .type = "pcie", },
	304	{ .type = "pciex", },
	305	{ .type = "ht", },
	306	{}
	307	};
	308
	309	static struct of_platform_driver of_pci_phb_driver = {
cd6eed37 SR	310	.match_table = of_pci_phb_ids,
	311	.probe = of_pci_phb_probe,
	312	.driver = {
	313	.name = "of-pci",
	314	},
4c9d2800 BH	315	};
	316
	317	static __init int of_pci_phb_init(void)
	318	{
	319	return of_register_platform_driver(&of_pci_phb_driver);
	320	}
	321
	322	device_initcall(of_pci_phb_init);
	323
	324	#endif /* CONFIG_PPC_OF_PLATFORM_PCI */