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-rw-r--r--include/fdtdec.h112
1 files changed, 112 insertions, 0 deletions
diff --git a/include/fdtdec.h b/include/fdtdec.h
index 0b14075..5164ce2 100644
--- a/include/fdtdec.h
+++ b/include/fdtdec.h
@@ -40,10 +40,12 @@
typedef u64 fdt_addr_t;
#define FDT_ADDR_T_NONE (-1ULL)
#define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
+#define fdt_size_to_cpu(reg) be64_to_cpu(reg)
#else
typedef u32 fdt_addr_t;
#define FDT_ADDR_T_NONE (-1U)
#define fdt_addr_to_cpu(reg) be32_to_cpu(reg)
+#define fdt_size_to_cpu(reg) be32_to_cpu(reg)
#endif
/* Information obtained about memory from the FDT */
@@ -88,6 +90,22 @@ struct fdt_gpio_state {
#define fdt_gpio_isvalid(x) ((x)->gpio != FDT_GPIO_NONE)
/**
+ * Read the GPIO taking into account the polarity of the pin.
+ *
+ * @param gpio pointer to the decoded gpio
+ * @return value of the gpio if successful, < 0 if unsuccessful
+ */
+int fdtdec_get_gpio(struct fdt_gpio_state *gpio);
+
+/**
+ * Write the GPIO taking into account the polarity of the pin.
+ *
+ * @param gpio pointer to the decoded gpio
+ * @return 0 if successful
+ */
+int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val);
+
+/**
* Find the next numbered alias for a peripheral. This is used to enumerate
* all the peripherals of a certain type.
*
@@ -108,6 +126,19 @@ int fdtdec_next_alias(const void *blob, const char *name,
enum fdt_compat_id id, int *upto);
/**
+ * Find the compatible ID for a given node.
+ *
+ * Generally each node has at least one compatible string attached to it.
+ * This function looks through our list of known compatible strings and
+ * returns the corresponding ID which matches the compatible string.
+ *
+ * @param blob FDT blob to use
+ * @param node Node containing compatible string to find
+ * @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match
+ */
+enum fdt_compat_id fdtdec_lookup(const void *blob, int node);
+
+/**
* Find the next compatible node for a peripheral.
*
* Do the first call with node = 0. This function will return a pointer to
@@ -167,6 +198,21 @@ s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
s32 default_val);
/**
+ * Look up a 64-bit integer property in a node and return it. The property
+ * must have at least 8 bytes of data (2 cells). The first two cells are
+ * concatenated to form a 8 bytes value, where the first cell is top half and
+ * the second cell is bottom half.
+ *
+ * @param blob FDT blob
+ * @param node node to examine
+ * @param prop_name name of property to find
+ * @param default_val default value to return if the property is not found
+ * @return integer value, if found, or default_val if not
+ */
+uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
+ uint64_t default_val);
+
+/**
* Checks whether a node is enabled.
* This looks for a 'status' property. If this exists, then returns 1 if
* the status is 'ok' and 0 otherwise. If there is no status property,
@@ -343,6 +389,22 @@ int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
struct fdt_gpio_state *gpio);
/**
+ * 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.
+ */
+int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
+ struct fdt_gpio_state *gpio, int max_count);
+
+/**
* Set up a GPIO pin according to the provided gpio information. At present this
* just requests the GPIO.
*
@@ -354,6 +416,39 @@ int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
*/
int fdtdec_setup_gpio(struct fdt_gpio_state *gpio);
+/**
+ * Look in the FDT for a config item with the given name and return its value
+ * as a 32-bit integer. The property must have at least 4 bytes of data. The
+ * value of the first cell is returned.
+ *
+ * @param blob FDT blob to use
+ * @param prop_name Node property name
+ * @param default_val default value to return if the property is not found
+ * @return integer value, if found, or default_val if not
+ */
+int fdtdec_get_config_int(const void *blob, const char *prop_name,
+ int default_val);
+
+/**
+ * Look in the FDT for a config item with the given name
+ * and return whether it exists.
+ *
+ * @param blob FDT blob
+ * @param prop_name property name to look up
+ * @return 1, if it exists, or 0 if not
+ */
+int fdtdec_get_config_bool(const void *blob, const char *prop_name);
+
+/**
+ * Look in the FDT for a config item with the given name and return its value
+ * as a string.
+ *
+ * @param blob FDT blob
+ * @param prop_name property name to look up
+ * @returns property string, NULL on error.
+ */
+char *fdtdec_get_config_string(const void *blob, const char *prop_name);
+
/*
* Look up a property in a node and return its contents in a byte
* array of given length. The property must have at least enough data for
@@ -385,4 +480,21 @@ int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
*/
const u8 *fdtdec_locate_byte_array(const void *blob, int node,
const char *prop_name, int count);
+
+/**
+ * Look up a property in a node which contains a memory region address and
+ * size. Then return a pointer to this address.
+ *
+ * The property must hold one address with a length. This is only tested on
+ * 32-bit machines.
+ *
+ * @param blob FDT blob
+ * @param node node to examine
+ * @param prop_name name of property to find
+ * @param ptrp returns pointer to region, or NULL if no address
+ * @param size returns size of region
+ * @return 0 if ok, -1 on error (propery not found)
+ */
+int fdtdec_decode_region(const void *blob, int node,
+ const char *prop_name, void **ptrp, size_t *size);
#endif