#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)
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)
{
return node;
}
-/* TODO: Can we tighten this code up a little? */
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];
__func__, name);
/* Now find all the aliases */
- memset(node_list, '\0', sizeof(*node_list) * maxcount);
-
for (offset = fdt_first_property_offset(blob, alias_node);
offset > 0;
offset = fdt_next_property_offset(blob, offset)) {
* 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[j] = 0;
+ nodes[found] = 0;
}
/* Add any nodes not mentioned by an alias */
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_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)
{
- /* We must have an fdt */
- if (((uintptr_t)gd->fdt_blob & 3) || 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 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;
}
+
+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