#include <libfdt.h>
#include <fdtdec.h>
+/* we need the generic GPIO interface here */
+#include <asm-generic/gpio.h>
+
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"),
+ COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
+ COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
+ COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"),
};
+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.
*
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)
return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
}
+int fdtdec_next_compatible_subnode(const void *blob, int node,
+ enum fdt_compat_id id, int *depthp)
+{
+ do {
+ node = fdt_next_node(blob, node, depthp);
+ } while (*depthp > 1);
+
+ /* If this is a direct subnode, and compatible, return it */
+ if (*depthp == 1 && 0 == fdt_node_check_compatible(
+ blob, node, compat_names[id]))
+ return node;
+
+ return -FDT_ERR_NOTFOUND;
+}
+
int fdtdec_next_alias(const void *blob, const char *name,
enum fdt_compat_id id, int *upto)
{
/* 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;
}
/*
* 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)
+{
+ 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;
+}
+
+const u32 *fdtdec_locate_array(const void *blob, int node,
+ const char *prop_name, int count)
+{
+ const u32 *cell;
+ int err;
+
+ cell = get_prop_check_min_len(blob, node, prop_name,
+ sizeof(u32) * count, &err);
+ return err ? NULL : cell;
+}
+
+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)
{
- /* 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 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;
}
+
+int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
+ u8 *array, int count)
+{
+ const u8 *cell;
+ int err;
+
+ cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
+ if (!err)
+ memcpy(array, cell, count);
+ return err;
+}
+
+const u8 *fdtdec_locate_byte_array(const void *blob, int node,
+ const char *prop_name, int count)
+{
+ const u8 *cell;
+ int err;
+
+ cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
+ if (err)
+ return NULL;
+ return cell;
+}
projects / karo-tx-uboot.git / blobdiff