1 files changed, 313 insertions, 10 deletions

diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 0f87163..bdec1a0 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -24,6 +24,9 @@
 #include <libfdt.h>
 #include <fdtdec.h>
 
+/* we need the generic GPIO interface here */
+#include <asm-generic/gpio.h>
+
 DECLARE_GLOBAL_DATA_PTR;
 
 /*
@@ -33,8 +36,19 @@ DECLARE_GLOBAL_DATA_PTR;
  */
 #define COMPAT(id, name) name
 static const char * const compat_names[COMPAT_COUNT] = {
+	COMPAT(UNKNOWN, "<none>"),
+	COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
+	COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"),
+	COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"),
 };
 
+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.
  *
@@ -84,14 +98,21 @@ s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
 	return default_val;
 }
 
-int fdtdec_get_is_enabled(const void *blob, int node, int 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, "ok");
-	return default_val;
+		return 0 == strcmp(cell, "okay");
+	return 1;
 }
 
 enum fdt_compat_id fd_dec_lookup(const void *blob, int node)
@@ -122,14 +143,151 @@ int fdtdec_next_alias(const void *blob, const char *name,
 	/* snprintf() is not available */
 	assert(strlen(name) < MAX_STR_LEN);
 	sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
-	(*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;
-	return err ? -FDT_ERR_NOTFOUND : node;
+	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;
 }
 
 /*
@@ -137,11 +295,156 @@ int fdtdec_next_alias(const void *blob, const char *name,
  * point if the architecture board.c files merge this will make more sense.
  * Even now, it is common code.
  */
-int fdtdec_check_fdt(void)
+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)
 {
-	/* We must have an fdt */
-	if (fdt_check_header(gd->fdt_blob))
-		panic("No valid fdt found - please append one to U-Boot\n"
-			"binary or define CONFIG_OF_EMBED\n");
+	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;
 }