[people/ms/u-boot.git] / lib / fdtdec.c

/*
 * Copyright (c) 2011 The Chromium OS Authors.
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <serial.h>
#include <libfdt.h>
#include <fdtdec.h>

/* we need the generic GPIO interface here */
#include <asm-generic/gpio.h>

DECLARE_GLOBAL_DATA_PTR;

/*
 * Here are the type we know about. One day we might allow drivers to
 * register. For now we just put them here. The COMPAT macro allows us to
 * turn this into a sparse list later, and keeps the ID with the name.
 */
#define COMPAT(id, name) name
static const char * const compat_names[COMPAT_COUNT] = {
	COMPAT(UNKNOWN, "<none>"),
	COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
};

const char *fdtdec_get_compatible(enum fdt_compat_id id)
{
	/* We allow reading of the 'unknown' ID for testing purposes */
	assert(id >= 0 && id < COMPAT_COUNT);
	return compat_names[id];
}

/**
 * Look in the FDT for an alias with the given name and return its node.
 *
 * @param blob	FDT blob
 * @param name	alias name to look up
 * @return node offset if found, or an error code < 0 otherwise
 */
static int find_alias_node(const void *blob, const char *name)
{
	const char *path;
	int alias_node;

	debug("find_alias_node: %s\n", name);
	alias_node = fdt_path_offset(blob, "/aliases");
	if (alias_node < 0)
		return alias_node;
	path = fdt_getprop(blob, alias_node, name, NULL);
	if (!path)
		return -FDT_ERR_NOTFOUND;
	return fdt_path_offset(blob, path);
}

fdt_addr_t fdtdec_get_addr(const void *blob, int node,
		const char *prop_name)
{
	const fdt_addr_t *cell;
	int len;

	debug("get_addr: %s\n", prop_name);
	cell = fdt_getprop(blob, node, prop_name, &len);
	if (cell && (len == sizeof(fdt_addr_t) ||
			len == sizeof(fdt_addr_t) * 2))
		return fdt_addr_to_cpu(*cell);
	return FDT_ADDR_T_NONE;
}

s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
		s32 default_val)
{
	const s32 *cell;
	int len;

	debug("get_size: %s\n", prop_name);
	cell = fdt_getprop(blob, node, prop_name, &len);
	if (cell && len >= sizeof(s32))
		return fdt32_to_cpu(cell[0]);
	return default_val;
}

int fdtdec_get_is_enabled(const void *blob, int node)
{
	const char *cell;

	/*
	 * It should say "okay", so only allow that. Some fdts use "ok" but
	 * this is a bug. Please fix your device tree source file. See here
	 * for discussion:
	 *
	 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
	 */
	cell = fdt_getprop(blob, node, "status", NULL);
	if (cell)
		return 0 == strcmp(cell, "okay");
	return 1;
}

enum fdt_compat_id fd_dec_lookup(const void *blob, int node)
{
	enum fdt_compat_id id;

	/* Search our drivers */
	for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
		if (0 == fdt_node_check_compatible(blob, node,
				compat_names[id]))
			return id;
	return COMPAT_UNKNOWN;
}

int fdtdec_next_compatible(const void *blob, int node,
		enum fdt_compat_id id)
{
	return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
}

int fdtdec_next_alias(const void *blob, const char *name,
		enum fdt_compat_id id, int *upto)
{
#define MAX_STR_LEN 20
	char str[MAX_STR_LEN + 20];
	int node, err;

	/* snprintf() is not available */
	assert(strlen(name) < MAX_STR_LEN);
	sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
	node = find_alias_node(blob, str);
	if (node < 0)
		return node;
	err = fdt_node_check_compatible(blob, node, compat_names[id]);
	if (err < 0)
		return err;
	if (err)
		return -FDT_ERR_NOTFOUND;
	(*upto)++;
	return node;
}

int fdtdec_find_aliases_for_id(const void *blob, const char *name,
			enum fdt_compat_id id, int *node_list, int maxcount)
{
	memset(node_list, '\0', sizeof(*node_list) * maxcount);

	return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
}

/* TODO: Can we tighten this code up a little? */
int fdtdec_add_aliases_for_id(const void *blob, const char *name,
			enum fdt_compat_id id, int *node_list, int maxcount)
{
	int name_len = strlen(name);
	int nodes[maxcount];
	int num_found = 0;
	int offset, node;
	int alias_node;
	int count;
	int i, j;

	/* find the alias node if present */
	alias_node = fdt_path_offset(blob, "/aliases");

	/*
	 * start with nothing, and we can assume that the root node can't
	 * match
	 */
	memset(nodes, '\0', sizeof(nodes));

	/* First find all the compatible nodes */
	for (node = count = 0; node >= 0 && count < maxcount;) {
		node = fdtdec_next_compatible(blob, node, id);
		if (node >= 0)
			nodes[count++] = node;
	}
	if (node >= 0)
		debug("%s: warning: maxcount exceeded with alias '%s'\n",
		       __func__, name);

	/* Now find all the aliases */
	for (offset = fdt_first_property_offset(blob, alias_node);
			offset > 0;
			offset = fdt_next_property_offset(blob, offset)) {
		const struct fdt_property *prop;
		const char *path;
		int number;
		int found;

		node = 0;
		prop = fdt_get_property_by_offset(blob, offset, NULL);
		path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
		if (prop->len && 0 == strncmp(path, name, name_len))
			node = fdt_path_offset(blob, prop->data);
		if (node <= 0)
			continue;

		/* Get the alias number */
		number = simple_strtoul(path + name_len, NULL, 10);
		if (number < 0 || number >= maxcount) {
			debug("%s: warning: alias '%s' is out of range\n",
			       __func__, path);
			continue;
		}

		/* Make sure the node we found is actually in our list! */
		found = -1;
		for (j = 0; j < count; j++)
			if (nodes[j] == node) {
				found = j;
				break;
			}

		if (found == -1) {
			debug("%s: warning: alias '%s' points to a node "
				"'%s' that is missing or is not compatible "
				" with '%s'\n", __func__, path,
				fdt_get_name(blob, node, NULL),
			       compat_names[id]);
			continue;
		}

		/*
		 * Add this node to our list in the right place, and mark
		 * it as done.
		 */
		if (fdtdec_get_is_enabled(blob, node)) {
			if (node_list[number]) {
				debug("%s: warning: alias '%s' requires that "
				      "a node be placed in the list in a "
				      "position which is already filled by "
				      "node '%s'\n", __func__, path,
				      fdt_get_name(blob, node, NULL));
				continue;
			}
			node_list[number] = node;
			if (number >= num_found)
				num_found = number + 1;
		}
		nodes[found] = 0;
	}

	/* Add any nodes not mentioned by an alias */
	for (i = j = 0; i < maxcount; i++) {
		if (!node_list[i]) {
			for (; j < maxcount; j++)
				if (nodes[j] &&
					fdtdec_get_is_enabled(blob, nodes[j]))
					break;

			/* Have we run out of nodes to add? */
			if (j == maxcount)
				break;

			assert(!node_list[i]);
			node_list[i] = nodes[j++];
			if (i >= num_found)
				num_found = i + 1;
		}
	}

	return num_found;
}

int fdtdec_check_fdt(void)
{
	/*
	 * We must have an FDT, but we cannot panic() yet since the console
	 * is not ready. So for now, just assert(). Boards which need an early
	 * FDT (prior to console ready) will need to make their own
	 * arrangements and do their own checks.
	 */
	assert(!fdtdec_prepare_fdt());
	return 0;
}

/*
 * This function is a little odd in that it accesses global data. At some
 * point if the architecture board.c files merge this will make more sense.
 * Even now, it is common code.
 */
int fdtdec_prepare_fdt(void)
{
	if (((uintptr_t)gd->fdt_blob & 3) || fdt_check_header(gd->fdt_blob)) {
		printf("No valid FDT found - please append one to U-Boot "
			"binary, use u-boot-dtb.bin or define "
			"CONFIG_OF_EMBED\n");
		return -1;
	}
	return 0;
}

int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
{
	const u32 *phandle;
	int lookup;

	phandle = fdt_getprop(blob, node, prop_name, NULL);
	if (!phandle)
		return -FDT_ERR_NOTFOUND;

	lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
	return lookup;
}

/**
 * Look up a property in a node and check that it has a minimum length.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param prop_name	name of property to find
 * @param min_len	minimum property length in bytes
 * @param err		0 if ok, or -FDT_ERR_NOTFOUND if the property is not
			found, or -FDT_ERR_BADLAYOUT if not enough data
 * @return pointer to cell, which is only valid if err == 0
 */
static const void *get_prop_check_min_len(const void *blob, int node,
		const char *prop_name, int min_len, int *err)
{
	const void *cell;
	int len;

	debug("%s: %s\n", __func__, prop_name);
	cell = fdt_getprop(blob, node, prop_name, &len);
	if (!cell)
		*err = -FDT_ERR_NOTFOUND;
	else if (len < min_len)
		*err = -FDT_ERR_BADLAYOUT;
	else
		*err = 0;
	return cell;
}

int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
		u32 *array, int count)
{
	const u32 *cell;
	int i, err = 0;

	debug("%s: %s\n", __func__, prop_name);
	cell = get_prop_check_min_len(blob, node, prop_name,
				      sizeof(u32) * count, &err);
	if (!err) {
		for (i = 0; i < count; i++)
			array[i] = fdt32_to_cpu(cell[i]);
	}
	return err;
}

int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
{
	const s32 *cell;
	int len;

	debug("%s: %s\n", __func__, prop_name);
	cell = fdt_getprop(blob, node, prop_name, &len);
	return cell != NULL;
}

/**
 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
 * terminating item.
 *
 * @param blob		FDT blob to use
 * @param node		Node to look at
 * @param prop_name	Node property name
 * @param gpio		Array of gpio elements to fill from FDT. This will be
 *			untouched if either 0 or an error is returned
 * @param max_count	Maximum number of elements allowed
 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
 */
static int fdtdec_decode_gpios(const void *blob, int node,
		const char *prop_name, struct fdt_gpio_state *gpio,
		int max_count)
{
	const struct fdt_property *prop;
	const u32 *cell;
	const char *name;
	int len, i;

	debug("%s: %s\n", __func__, prop_name);
	assert(max_count > 0);
	prop = fdt_get_property(blob, node, prop_name, &len);
	if (!prop) {
		debug("FDT: %s: property '%s' missing\n", __func__, prop_name);
		return -FDT_ERR_NOTFOUND;
	}

	/* We will use the name to tag the GPIO */
	name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
	cell = (u32 *)prop->data;
	len /= sizeof(u32) * 3;		/* 3 cells per GPIO record */
	if (len > max_count) {
		debug("FDT: %s: too many GPIOs / cells for "
			"property '%s'\n", __func__, prop_name);
		return -FDT_ERR_BADLAYOUT;
	}

	/* Read out the GPIO data from the cells */
	for (i = 0; i < len; i++, cell += 3) {
		gpio[i].gpio = fdt32_to_cpu(cell[1]);
		gpio[i].flags = fdt32_to_cpu(cell[2]);
		gpio[i].name = name;
	}

	return len;
}

int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
		struct fdt_gpio_state *gpio)
{
	int err;

	debug("%s: %s\n", __func__, prop_name);
	gpio->gpio = FDT_GPIO_NONE;
	gpio->name = NULL;
	err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
	return err == 1 ? 0 : err;
}

int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
{
	/*
	 * Return success if there is no GPIO defined. This is used for
	 * optional GPIOs)
	 */
	if (!fdt_gpio_isvalid(gpio))
		return 0;

	if (gpio_request(gpio->gpio, gpio->name))
		return -1;
	return 0;
}
Commit	Line	Data
b5220bc6 SG	1	/*
	2	* Copyright (c) 2011 The Chromium OS Authors.
	3	* See file CREDITS for list of people who contributed to this
	4	* project.
	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 as
	8	* published by the Free Software Foundation; either version 2 of
	9	* the License, or (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	19	* MA 02111-1307 USA
	20	*/
	21
	22	#include <common.h>
	23	#include <serial.h>
	24	#include <libfdt.h>
	25	#include <fdtdec.h>
	26
ed3ee5cd SG	27	/* we need the generic GPIO interface here */
	28	#include <asm-generic/gpio.h>
	29
b5220bc6 SG	30	DECLARE_GLOBAL_DATA_PTR;
	31
	32	/*
	33	* Here are the type we know about. One day we might allow drivers to
	34	* register. For now we just put them here. The COMPAT macro allows us to
	35	* turn this into a sparse list later, and keeps the ID with the name.
	36	*/
	37	#define COMPAT(id, name) name
	38	static const char * const compat_names[COMPAT_COUNT] = {
f88fe2de	39	COMPAT(UNKNOWN, "<none>"),
87f938c9	40	COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
b5220bc6 SG	41	};
b5220bc6 SG	42
a53f4a29 SG	43	const char *fdtdec_get_compatible(enum fdt_compat_id id)
	44	{
	45	/* We allow reading of the 'unknown' ID for testing purposes */
	46	assert(id >= 0 && id < COMPAT_COUNT);
	47	return compat_names[id];
	48	}
	49
b5220bc6 SG	50	/**
	51	* Look in the FDT for an alias with the given name and return its node.
	52	*
	53	* @param blob FDT blob
	54	* @param name alias name to look up
	55	* @return node offset if found, or an error code < 0 otherwise
	56	*/
	57	static int find_alias_node(const void blob, const char name)
	58	{
	59	const char *path;
	60	int alias_node;
	61
	62	debug("find_alias_node: %s\n", name);
	63	alias_node = fdt_path_offset(blob, "/aliases");
	64	if (alias_node < 0)
	65	return alias_node;
	66	path = fdt_getprop(blob, alias_node, name, NULL);
	67	if (!path)
	68	return -FDT_ERR_NOTFOUND;
	69	return fdt_path_offset(blob, path);
	70	}
	71
	72	fdt_addr_t fdtdec_get_addr(const void *blob, int node,
	73	const char *prop_name)
	74	{
	75	const fdt_addr_t *cell;
	76	int len;
	77
	78	debug("get_addr: %s\n", prop_name);
	79	cell = fdt_getprop(blob, node, prop_name, &len);
	80	if (cell && (len == sizeof(fdt_addr_t) \|\|
	81	len == sizeof(fdt_addr_t) * 2))
	82	return fdt_addr_to_cpu(*cell);
	83	return FDT_ADDR_T_NONE;
	84	}
	85
	86	s32 fdtdec_get_int(const void blob, int node, const char prop_name,
	87	s32 default_val)
	88	{
	89	const s32 *cell;
	90	int len;
	91
	92	debug("get_size: %s\n", prop_name);
	93	cell = fdt_getprop(blob, node, prop_name, &len);
	94	if (cell && len >= sizeof(s32))
	95	return fdt32_to_cpu(cell[0]);
	96	return default_val;
	97	}
	98
f88fe2de	99	int fdtdec_get_is_enabled(const void *blob, int node)
b5220bc6 SG	100	{
	101	const char *cell;
	102
f88fe2de SG	103	/*
	104	* It should say "okay", so only allow that. Some fdts use "ok" but
	105	* this is a bug. Please fix your device tree source file. See here
	106	* for discussion:
	107	*
	108	* http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
	109	*/
b5220bc6 SG	110	cell = fdt_getprop(blob, node, "status", NULL);
b5220bc6 SG	111	if (cell)
f88fe2de SG	112	return 0 == strcmp(cell, "okay");
f88fe2de SG	113	return 1;
b5220bc6 SG	114	}
	115
	116	enum fdt_compat_id fd_dec_lookup(const void *blob, int node)
	117	{
	118	enum fdt_compat_id id;
	119
	120	/* Search our drivers */
	121	for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
	122	if (0 == fdt_node_check_compatible(blob, node,
	123	compat_names[id]))
	124	return id;
	125	return COMPAT_UNKNOWN;
	126	}
	127
	128	int fdtdec_next_compatible(const void *blob, int node,
	129	enum fdt_compat_id id)
	130	{
	131	return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
	132	}
	133
	134	int fdtdec_next_alias(const void blob, const char name,
	135	enum fdt_compat_id id, int *upto)
	136	{
	137	#define MAX_STR_LEN 20
	138	char str[MAX_STR_LEN + 20];
	139	int node, err;
	140
	141	/* snprintf() is not available */
	142	assert(strlen(name) < MAX_STR_LEN);
	143	sprintf(str, "%.s%d", MAX_STR_LEN, name, upto);
b5220bc6 SG	144	node = find_alias_node(blob, str);
	145	if (node < 0)
	146	return node;
	147	err = fdt_node_check_compatible(blob, node, compat_names[id]);
	148	if (err < 0)
	149	return err;
f88fe2de SG	150	if (err)
	151	return -FDT_ERR_NOTFOUND;
	152	(*upto)++;
	153	return node;
b5220bc6 SG	154	}
b5220bc6 SG	155
a53f4a29 SG	156	int fdtdec_find_aliases_for_id(const void blob, const char name,
a53f4a29 SG	157	enum fdt_compat_id id, int *node_list, int maxcount)
c6782270 SG	158	{
	159	memset(node_list, '\0', sizeof(node_list) maxcount);
	160
	161	return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
	162	}
	163
	164	/* TODO: Can we tighten this code up a little? */
	165	int fdtdec_add_aliases_for_id(const void blob, const char name,
	166	enum fdt_compat_id id, int *node_list, int maxcount)
a53f4a29 SG	167	{
	168	int name_len = strlen(name);
	169	int nodes[maxcount];
	170	int num_found = 0;
	171	int offset, node;
	172	int alias_node;
	173	int count;
	174	int i, j;
	175
	176	/* find the alias node if present */
	177	alias_node = fdt_path_offset(blob, "/aliases");
	178
	179	/*
	180	* start with nothing, and we can assume that the root node can't
	181	* match
	182	*/
	183	memset(nodes, '\0', sizeof(nodes));
	184
	185	/* First find all the compatible nodes */
	186	for (node = count = 0; node >= 0 && count < maxcount;) {
	187	node = fdtdec_next_compatible(blob, node, id);
	188	if (node >= 0)
	189	nodes[count++] = node;
	190	}
	191	if (node >= 0)
	192	debug("%s: warning: maxcount exceeded with alias '%s'\n",
	193	__func__, name);
	194
	195	/* Now find all the aliases */
a53f4a29 SG	196	for (offset = fdt_first_property_offset(blob, alias_node);
	197	offset > 0;
	198	offset = fdt_next_property_offset(blob, offset)) {
	199	const struct fdt_property *prop;
	200	const char *path;
	201	int number;
	202	int found;
	203
	204	node = 0;
	205	prop = fdt_get_property_by_offset(blob, offset, NULL);
	206	path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
	207	if (prop->len && 0 == strncmp(path, name, name_len))
	208	node = fdt_path_offset(blob, prop->data);
	209	if (node <= 0)
	210	continue;
	211
	212	/* Get the alias number */
	213	number = simple_strtoul(path + name_len, NULL, 10);
	214	if (number < 0 \|\| number >= maxcount) {
	215	debug("%s: warning: alias '%s' is out of range\n",
	216	__func__, path);
	217	continue;
	218	}
	219
	220	/* Make sure the node we found is actually in our list! */
	221	found = -1;
	222	for (j = 0; j < count; j++)
	223	if (nodes[j] == node) {
	224	found = j;
	225	break;
	226	}
	227
	228	if (found == -1) {
	229	debug("%s: warning: alias '%s' points to a node "
	230	"'%s' that is missing or is not compatible "
	231	" with '%s'\n", __func__, path,
	232	fdt_get_name(blob, node, NULL),
	233	compat_names[id]);
	234	continue;
	235	}
	236
	237	/*
	238	* Add this node to our list in the right place, and mark
	239	* it as done.
	240	*/
	241	if (fdtdec_get_is_enabled(blob, node)) {
c6782270 SG	242	if (node_list[number]) {
	243	debug("%s: warning: alias '%s' requires that "
	244	"a node be placed in the list in a "
	245	"position which is already filled by "
	246	"node '%s'\n", __func__, path,
	247	fdt_get_name(blob, node, NULL));
	248	continue;
	249	}
a53f4a29 SG	250	node_list[number] = node;
	251	if (number >= num_found)
	252	num_found = number + 1;
	253	}
c6782270	254	nodes[found] = 0;
a53f4a29 SG	255	}
	256
	257	/* Add any nodes not mentioned by an alias */
	258	for (i = j = 0; i < maxcount; i++) {
	259	if (!node_list[i]) {
	260	for (; j < maxcount; j++)
	261	if (nodes[j] &&
	262	fdtdec_get_is_enabled(blob, nodes[j]))
	263	break;
	264
	265	/* Have we run out of nodes to add? */
	266	if (j == maxcount)
	267	break;
	268
	269	assert(!node_list[i]);
	270	node_list[i] = nodes[j++];
	271	if (i >= num_found)
	272	num_found = i + 1;
	273	}
	274	}
	275
	276	return num_found;
	277	}
	278
9a263e55 SG	279	int fdtdec_check_fdt(void)
	280	{
	281	/*
	282	* We must have an FDT, but we cannot panic() yet since the console
	283	* is not ready. So for now, just assert(). Boards which need an early
	284	* FDT (prior to console ready) will need to make their own
	285	* arrangements and do their own checks.
	286	*/
	287	assert(!fdtdec_prepare_fdt());
	288	return 0;
	289	}
	290
b5220bc6 SG	291	/*
	292	* This function is a little odd in that it accesses global data. At some
	293	* point if the architecture board.c files merge this will make more sense.
	294	* Even now, it is common code.
	295	*/
9a263e55	296	int fdtdec_prepare_fdt(void)
b5220bc6	297	{
9a263e55 SG	298	if (((uintptr_t)gd->fdt_blob & 3) \|\| fdt_check_header(gd->fdt_blob)) {
	299	printf("No valid FDT found - please append one to U-Boot "
	300	"binary, use u-boot-dtb.bin or define "
	301	"CONFIG_OF_EMBED\n");
	302	return -1;
	303	}
b5220bc6 SG	304	return 0;
b5220bc6 SG	305	}
d17da655 SG	306
	307	int fdtdec_lookup_phandle(const void blob, int node, const char prop_name)
	308	{
	309	const u32 *phandle;
	310	int lookup;
	311
	312	phandle = fdt_getprop(blob, node, prop_name, NULL);
	313	if (!phandle)
	314	return -FDT_ERR_NOTFOUND;
	315
	316	lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
	317	return lookup;
	318	}
	319
	320	/**
	321	* Look up a property in a node and check that it has a minimum length.
	322	*
	323	* @param blob FDT blob
	324	* @param node node to examine
	325	* @param prop_name name of property to find
	326	* @param min_len minimum property length in bytes
	327	* @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not
	328	found, or -FDT_ERR_BADLAYOUT if not enough data
	329	* @return pointer to cell, which is only valid if err == 0
	330	*/
	331	static const void get_prop_check_min_len(const void blob, int node,
	332	const char prop_name, int min_len, int err)
	333	{
	334	const void *cell;
	335	int len;
	336
	337	debug("%s: %s\n", __func__, prop_name);
	338	cell = fdt_getprop(blob, node, prop_name, &len);
	339	if (!cell)
	340	*err = -FDT_ERR_NOTFOUND;
	341	else if (len < min_len)
	342	*err = -FDT_ERR_BADLAYOUT;
	343	else
	344	*err = 0;
	345	return cell;
	346	}
	347
	348	int fdtdec_get_int_array(const void blob, int node, const char prop_name,
	349	u32 *array, int count)
	350	{
	351	const u32 *cell;
	352	int i, err = 0;
	353
	354	debug("%s: %s\n", __func__, prop_name);
	355	cell = get_prop_check_min_len(blob, node, prop_name,
	356	sizeof(u32) * count, &err);
	357	if (!err) {
	358	for (i = 0; i < count; i++)
	359	array[i] = fdt32_to_cpu(cell[i]);
	360	}
	361	return err;
	362	}
	363
	364	int fdtdec_get_bool(const void blob, int node, const char prop_name)
	365	{
	366	const s32 *cell;
	367	int len;
	368
	369	debug("%s: %s\n", __func__, prop_name);
370	cell = fdt_getprop(blob, node, prop_name, &len);
371	return cell != NULL;
372	}
ed3ee5cd SG	373
	374	/**
	375	* Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
	376	* terminating item.
	377	*
	378	* @param blob FDT blob to use
	379	* @param node Node to look at
	380	* @param prop_name Node property name
	381	* @param gpio Array of gpio elements to fill from FDT. This will be
	382	* untouched if either 0 or an error is returned
	383	* @param max_count Maximum number of elements allowed
	384	* @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
	385	* be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
	386	*/
	387	static int fdtdec_decode_gpios(const void *blob, int node,
	388	const char prop_name, struct fdt_gpio_state gpio,
	389	int max_count)
	390	{
	391	const struct fdt_property *prop;
	392	const u32 *cell;
	393	const char *name;
	394	int len, i;
	395
	396	debug("%s: %s\n", __func__, prop_name);
	397	assert(max_count > 0);
	398	prop = fdt_get_property(blob, node, prop_name, &len);
	399	if (!prop) {
	400	debug("FDT: %s: property '%s' missing\n", __func__, prop_name);
	401	return -FDT_ERR_NOTFOUND;
	402	}
	403
	404	/* We will use the name to tag the GPIO */
	405	name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
	406	cell = (u32 *)prop->data;
	407	len /= sizeof(u32) * 3; /* 3 cells per GPIO record */
	408	if (len > max_count) {
	409	debug("FDT: %s: too many GPIOs / cells for "
	410	"property '%s'\n", __func__, prop_name);
	411	return -FDT_ERR_BADLAYOUT;
	412	}
	413
	414	/* Read out the GPIO data from the cells */
	415	for (i = 0; i < len; i++, cell += 3) {
	416	gpio[i].gpio = fdt32_to_cpu(cell[1]);
	417	gpio[i].flags = fdt32_to_cpu(cell[2]);
	418	gpio[i].name = name;
	419	}
	420
	421	return len;
	422	}
	423
	424	int fdtdec_decode_gpio(const void blob, int node, const char prop_name,
	425	struct fdt_gpio_state *gpio)
	426	{
	427	int err;
	428
	429	debug("%s: %s\n", __func__, prop_name);
	430	gpio->gpio = FDT_GPIO_NONE;
	431	gpio->name = NULL;
	432	err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
	433	return err == 1 ? 0 : err;
	434	}
	435
	436	int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
437	{
438	/*
439	* Return success if there is no GPIO defined. This is used for
440	* optional GPIOs)
441	*/
442	if (!fdt_gpio_isvalid(gpio))
443	return 0;
444
445	if (gpio_request(gpio->gpio, gpio->name))
446	return -1;
447	return 0;
448	}