[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / of / pdt.c

/* pdt.c: OF PROM device tree support code.
 *
 * Paul Mackerras	August 1996.
 * Copyright (C) 1996-2005 Paul Mackerras.
 *
 *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
 *    {engebret|bergner}@us.ibm.com
 *
 *  Adapted for sparc by David S. Miller davem@davemloft.net
 *  Adapted for multiple architectures by Andres Salomon <dilinger@queued.net>
 *
 *      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.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_pdt.h>
#include <asm/prom.h>

static struct of_pdt_ops *of_pdt_prom_ops __initdata;

void __initdata (*of_pdt_build_more)(struct device_node *dp,
		struct device_node ***nextp);

#if defined(CONFIG_SPARC)
unsigned int of_pdt_unique_id __initdata;

#define of_pdt_incr_unique_id(p) do { \
	(p)->unique_id = of_pdt_unique_id++; \
} while (0)

static char * __init of_pdt_build_full_name(struct device_node *dp)
{
	int len, ourlen, plen;
	char *n;

	dp->path_component_name = build_path_component(dp);

	plen = strlen(dp->parent->full_name);
	ourlen = strlen(dp->path_component_name);
	len = ourlen + plen + 2;

	n = prom_early_alloc(len);
	strcpy(n, dp->parent->full_name);
	if (!of_node_is_root(dp->parent)) {
		strcpy(n + plen, "/");
		plen++;
	}
	strcpy(n + plen, dp->path_component_name);

	return n;
}

#else /* CONFIG_SPARC */

static inline void of_pdt_incr_unique_id(void *p) { }
static inline void irq_trans_init(struct device_node *dp) { }

static char * __init of_pdt_build_full_name(struct device_node *dp)
{
	static int failsafe_id = 0; /* for generating unique names on failure */
	char *buf;
	int len;

	if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len))
		goto failsafe;

	buf = prom_early_alloc(len + 1);
	if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len))
		goto failsafe;
	return buf;

 failsafe:
	buf = prom_early_alloc(strlen(dp->parent->full_name) +
			       strlen(dp->name) + 16);
	sprintf(buf, "%s/%s@unknown%i",
		of_node_is_root(dp->parent) ? "" : dp->parent->full_name,
		dp->name, failsafe_id++);
	pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf);
	return buf;
}

#endif /* !CONFIG_SPARC */

static struct property * __init of_pdt_build_one_prop(phandle node, char *prev,
					       char *special_name,
					       void *special_val,
					       int special_len)
{
	static struct property *tmp = NULL;
	struct property *p;
	int err;

	if (tmp) {
		p = tmp;
		memset(p, 0, sizeof(*p) + 32);
		tmp = NULL;
	} else {
		p = prom_early_alloc(sizeof(struct property) + 32);
		of_pdt_incr_unique_id(p);
	}

	p->name = (char *) (p + 1);
	if (special_name) {
		strcpy(p->name, special_name);
		p->length = special_len;
		p->value = prom_early_alloc(special_len);
		memcpy(p->value, special_val, special_len);
	} else {
		err = of_pdt_prom_ops->nextprop(node, prev, p->name);
		if (err) {
			tmp = p;
			return NULL;
		}
		p->length = of_pdt_prom_ops->getproplen(node, p->name);
		if (p->length <= 0) {
			p->length = 0;
		} else {
			int len;

			p->value = prom_early_alloc(p->length + 1);
			len = of_pdt_prom_ops->getproperty(node, p->name,
					p->value, p->length);
			if (len <= 0)
				p->length = 0;
			((unsigned char *)p->value)[p->length] = '\0';
		}
	}
	return p;
}

static struct property * __init of_pdt_build_prop_list(phandle node)
{
	struct property *head, *tail;

	head = tail = of_pdt_build_one_prop(node, NULL,
				     ".node", &node, sizeof(node));

	tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0);
	tail = tail->next;
	while(tail) {
		tail->next = of_pdt_build_one_prop(node, tail->name,
					    NULL, NULL, 0);
		tail = tail->next;
	}

	return head;
}

static char * __init of_pdt_get_one_property(phandle node, const char *name)
{
	char *buf = "<NULL>";
	int len;

	len = of_pdt_prom_ops->getproplen(node, name);
	if (len > 0) {
		buf = prom_early_alloc(len);
		len = of_pdt_prom_ops->getproperty(node, name, buf, len);
	}

	return buf;
}

static struct device_node * __init of_pdt_create_node(phandle node,
						    struct device_node *parent)
{
	struct device_node *dp;

	if (!node)
		return NULL;

	dp = prom_early_alloc(sizeof(*dp));
	of_pdt_incr_unique_id(dp);
	dp->parent = parent;

	kref_init(&dp->kref);

	dp->name = of_pdt_get_one_property(node, "name");
	dp->type = of_pdt_get_one_property(node, "device_type");
	dp->phandle = node;

	dp->properties = of_pdt_build_prop_list(node);

	irq_trans_init(dp);

	return dp;
}

static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
						   phandle node,
						   struct device_node ***nextp)
{
	struct device_node *ret = NULL, *prev_sibling = NULL;
	struct device_node *dp;

	while (1) {
		dp = of_pdt_create_node(node, parent);
		if (!dp)
			break;

		if (prev_sibling)
			prev_sibling->sibling = dp;

		if (!ret)
			ret = dp;
		prev_sibling = dp;

		*(*nextp) = dp;
		*nextp = &dp->allnext;

		dp->full_name = of_pdt_build_full_name(dp);

		dp->child = of_pdt_build_tree(dp,
				of_pdt_prom_ops->getchild(node), nextp);

		if (of_pdt_build_more)
			of_pdt_build_more(dp, nextp);

		node = of_pdt_prom_ops->getsibling(node);
	}

	return ret;
}

static void * __init kernel_tree_alloc(u64 size, u64 align)
{
	return prom_early_alloc(size);
}

void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
{
	struct device_node **nextp;

	BUG_ON(!ops);
	of_pdt_prom_ops = ops;

	of_allnodes = of_pdt_create_node(root_node, NULL);
#if defined(CONFIG_SPARC)
	of_allnodes->path_component_name = "";
#endif
	of_allnodes->full_name = "/";

	nextp = &of_allnodes->allnext;
	of_allnodes->child = of_pdt_build_tree(of_allnodes,
			of_pdt_prom_ops->getchild(of_allnodes->phandle), &nextp);

	/* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
	of_alias_scan(kernel_tree_alloc);
}
Commit	Line	Data
3cfc535c	1	/* pdt.c: OF PROM device tree support code.
9bdf6bab AS	2	*
	3	* Paul Mackerras August 1996.
	4	* Copyright (C) 1996-2005 Paul Mackerras.
	5	*
	6	* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
	7	* {engebret\|bergner}@us.ibm.com
	8	*
	9	* Adapted for sparc by David S. Miller davem@davemloft.net
3cfc535c	10	* Adapted for multiple architectures by Andres Salomon <dilinger@queued.net>
9bdf6bab AS	11	*
	12	* This program is free software; you can redistribute it and/or
	13	* modify it under the terms of the GNU General Public License
	14	* as published by the Free Software Foundation; either version
	15	* 2 of the License, or (at your option) any later version.
	16	*/
	17
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/errno.h>
	21	#include <linux/mutex.h>
	22	#include <linux/slab.h>
	23	#include <linux/of.h>
3cfc535c	24	#include <linux/of_pdt.h>
9bdf6bab	25	#include <asm/prom.h>
f90c34bd AS	26
f90c34bd AS	27	static struct of_pdt_ops *of_pdt_prom_ops __initdata;
9bdf6bab	28
ed418502	29	void __initdata (of_pdt_build_more)(struct device_node dp,
3cfc535c	30	struct device_node ***nextp);
9bdf6bab	31
3cfc535c AS	32	#if defined(CONFIG_SPARC)
	33	unsigned int of_pdt_unique_id __initdata;
	34
	35	#define of_pdt_incr_unique_id(p) do { \
	36	(p)->unique_id = of_pdt_unique_id++; \
	37	} while (0)
	38
a74ea43d	39	static char * __init of_pdt_build_full_name(struct device_node *dp)
3cfc535c	40	{
a74ea43d AS	41	int len, ourlen, plen;
	42	char *n;
	43
	44	dp->path_component_name = build_path_component(dp);
	45
	46	plen = strlen(dp->parent->full_name);
	47	ourlen = strlen(dp->path_component_name);
	48	len = ourlen + plen + 2;
	49
	50	n = prom_early_alloc(len);
	51	strcpy(n, dp->parent->full_name);
	52	if (!of_node_is_root(dp->parent)) {
	53	strcpy(n + plen, "/");
	54	plen++;
	55	}
	56	strcpy(n + plen, dp->path_component_name);
	57
	58	return n;
3cfc535c AS	59	}
3cfc535c AS	60
a74ea43d	61	#else /* CONFIG_SPARC */
3cfc535c AS	62
	63	static inline void of_pdt_incr_unique_id(void *p) { }
	64	static inline void irq_trans_init(struct device_node *dp) { }
	65
a74ea43d	66	static char * __init of_pdt_build_full_name(struct device_node *dp)
3cfc535c	67	{
a74ea43d AS	68	static int failsafe_id = 0; /* for generating unique names on failure */
	69	char *buf;
	70	int len;
	71
	72	if (of_pdt_prom_ops->pkg2path(dp->phandle, NULL, 0, &len))
	73	goto failsafe;
	74
	75	buf = prom_early_alloc(len + 1);
	76	if (of_pdt_prom_ops->pkg2path(dp->phandle, buf, len, &len))
	77	goto failsafe;
	78	return buf;
	79
	80	failsafe:
	81	buf = prom_early_alloc(strlen(dp->parent->full_name) +
	82	strlen(dp->name) + 16);
	83	sprintf(buf, "%s/%s@unknown%i",
	84	of_node_is_root(dp->parent) ? "" : dp->parent->full_name,
	85	dp->name, failsafe_id++);
	86	pr_err("%s: pkg2path failed; assigning %s\n", __func__, buf);
	87	return buf;
3cfc535c AS	88	}
	89
	90	#endif /* !CONFIG_SPARC */
9bdf6bab	91
ed418502	92	static struct property * __init of_pdt_build_one_prop(phandle node, char *prev,
9bdf6bab AS	93	char *special_name,
	94	void *special_val,
	95	int special_len)
	96	{
	97	static struct property *tmp = NULL;
	98	struct property *p;
f90c34bd	99	int err;
9bdf6bab AS	100
	101	if (tmp) {
	102	p = tmp;
	103	memset(p, 0, sizeof(*p) + 32);
	104	tmp = NULL;
	105	} else {
	106	p = prom_early_alloc(sizeof(struct property) + 32);
3cfc535c	107	of_pdt_incr_unique_id(p);
9bdf6bab AS	108	}
	109
	110	p->name = (char *) (p + 1);
	111	if (special_name) {
	112	strcpy(p->name, special_name);
	113	p->length = special_len;
	114	p->value = prom_early_alloc(special_len);
	115	memcpy(p->value, special_val, special_len);
	116	} else {
f90c34bd AS	117	err = of_pdt_prom_ops->nextprop(node, prev, p->name);
f90c34bd AS	118	if (err) {
9bdf6bab AS	119	tmp = p;
	120	return NULL;
	121	}
f90c34bd	122	p->length = of_pdt_prom_ops->getproplen(node, p->name);
9bdf6bab AS	123	if (p->length <= 0) {
	124	p->length = 0;
	125	} else {
	126	int len;
	127
	128	p->value = prom_early_alloc(p->length + 1);
f90c34bd AS	129	len = of_pdt_prom_ops->getproperty(node, p->name,
f90c34bd AS	130	p->value, p->length);
9bdf6bab AS	131	if (len <= 0)
	132	p->length = 0;
	133	((unsigned char *)p->value)[p->length] = '\0';
	134	}
	135	}
	136	return p;
	137	}
	138
ed418502	139	static struct property * __init of_pdt_build_prop_list(phandle node)
9bdf6bab AS	140	{
	141	struct property head, tail;
	142
ed418502	143	head = tail = of_pdt_build_one_prop(node, NULL,
9bdf6bab AS	144	".node", &node, sizeof(node));
9bdf6bab AS	145
ed418502	146	tail->next = of_pdt_build_one_prop(node, NULL, NULL, NULL, 0);
9bdf6bab AS	147	tail = tail->next;
9bdf6bab AS	148	while(tail) {
ed418502	149	tail->next = of_pdt_build_one_prop(node, tail->name,
9bdf6bab AS	150	NULL, NULL, 0);
	151	tail = tail->next;
	152	}
	153
	154	return head;
	155	}
	156
ed418502	157	static char * __init of_pdt_get_one_property(phandle node, const char *name)
9bdf6bab AS	158	{
	159	char *buf = "<NULL>";
	160	int len;
	161
f90c34bd	162	len = of_pdt_prom_ops->getproplen(node, name);
9bdf6bab AS	163	if (len > 0) {
9bdf6bab AS	164	buf = prom_early_alloc(len);
f90c34bd	165	len = of_pdt_prom_ops->getproperty(node, name, buf, len);
9bdf6bab AS	166	}
	167
	168	return buf;
	169	}
	170
ed418502	171	static struct device_node * __init of_pdt_create_node(phandle node,
9bdf6bab AS	172	struct device_node *parent)
	173	{
	174	struct device_node *dp;
	175
	176	if (!node)
	177	return NULL;
	178
	179	dp = prom_early_alloc(sizeof(*dp));
3cfc535c	180	of_pdt_incr_unique_id(dp);
9bdf6bab AS	181	dp->parent = parent;
	182
	183	kref_init(&dp->kref);
	184
a74ea43d	185	dp->name = of_pdt_get_one_property(node, "name");
ed418502	186	dp->type = of_pdt_get_one_property(node, "device_type");
9bdf6bab AS	187	dp->phandle = node;
9bdf6bab AS	188
ed418502	189	dp->properties = of_pdt_build_prop_list(node);
9bdf6bab AS	190
	191	irq_trans_init(dp);
	192
	193	return dp;
	194	}
	195
ed418502	196	static struct device_node * __init of_pdt_build_tree(struct device_node *parent,
9bdf6bab AS	197	phandle node,
	198	struct device_node ***nextp)
	199	{
	200	struct device_node ret = NULL, prev_sibling = NULL;
	201	struct device_node *dp;
	202
	203	while (1) {
ed418502	204	dp = of_pdt_create_node(node, parent);
9bdf6bab AS	205	if (!dp)
	206	break;
	207
	208	if (prev_sibling)
	209	prev_sibling->sibling = dp;
	210
	211	if (!ret)
	212	ret = dp;
	213	prev_sibling = dp;
	214
	215	(nextp) = dp;
	216	*nextp = &dp->allnext;
	217
ed418502	218	dp->full_name = of_pdt_build_full_name(dp);
9bdf6bab	219
ed418502	220	dp->child = of_pdt_build_tree(dp,
f90c34bd	221	of_pdt_prom_ops->getchild(node), nextp);
9bdf6bab	222
ed418502 AS	223	if (of_pdt_build_more)
ed418502 AS	224	of_pdt_build_more(dp, nextp);
9bdf6bab	225
f90c34bd	226	node = of_pdt_prom_ops->getsibling(node);
9bdf6bab AS	227	}
	228
	229	return ret;
	230	}
	231
75c71848	232	static void * __init kernel_tree_alloc(u64 size, u64 align)
611cad72 SG	233	{
	234	return prom_early_alloc(size);
	235	}
	236
f90c34bd	237	void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
9bdf6bab AS	238	{
	239	struct device_node **nextp;
	240
f90c34bd AS	241	BUG_ON(!ops);
	242	of_pdt_prom_ops = ops;
	243
465aac6d	244	of_allnodes = of_pdt_create_node(root_node, NULL);
3cfc535c	245	#if defined(CONFIG_SPARC)
465aac6d	246	of_allnodes->path_component_name = "";
3cfc535c	247	#endif
465aac6d	248	of_allnodes->full_name = "/";
9bdf6bab	249
465aac6d RD	250	nextp = &of_allnodes->allnext;
	251	of_allnodes->child = of_pdt_build_tree(of_allnodes,
	252	of_pdt_prom_ops->getchild(of_allnodes->phandle), &nextp);
611cad72 SG	253
	254	/* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
	255	of_alias_scan(kernel_tree_alloc);
9bdf6bab	256	}