1 files changed, 87 insertions, 0 deletions

diff --git a/include/linux/firewire.h b/include/linux/firewire.h
index e584b7215e8b..9823946adbc5 100644
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -3,6 +3,7 @@
 
 #include <linux/completion.h>
 #include <linux/device.h>
+#include <linux/dma-mapping.h>
 #include <linux/kernel.h>
 #include <linux/kref.h>
 #include <linux/list.h>
@@ -355,4 +356,90 @@ int fw_run_transaction(struct fw_card *card, int tcode, int destination_id,
                        int generation, int speed, unsigned long long offset,
                        void *payload, size_t length);
 
+static inline int fw_stream_packet_destination_id(int tag, int channel, int sy)
+{
+        return tag << 14 | channel << 8 | sy;
+}
+
+struct fw_descriptor {
+        struct list_head link;
+        size_t length;
+        u32 immediate;
+        u32 key;
+        const u32 *data;
+};
+
+int fw_core_add_descriptor(struct fw_descriptor *desc);
+void fw_core_remove_descriptor(struct fw_descriptor *desc);
+
+/*
+ * The iso packet format allows for an immediate header/payload part
+ * stored in 'header' immediately after the packet info plus an
+ * indirect payload part that is pointer to by the 'payload' field.
+ * Applications can use one or the other or both to implement simple
+ * low-bandwidth streaming (e.g. audio) or more advanced
+ * scatter-gather streaming (e.g. assembling video frame automatically).
+ */
+struct fw_iso_packet {
+        u16 payload_length;     /* Length of indirect payload. */
+        u32 interrupt:1;        /* Generate interrupt on this packet */
+        u32 skip:1;             /* Set to not send packet at all. */
+        u32 tag:2;
+        u32 sy:4;
+        u32 header_length:8;    /* Length of immediate header. */
+        u32 header[0];
+};
+
+#define FW_ISO_CONTEXT_TRANSMIT 0
+#define FW_ISO_CONTEXT_RECEIVE  1
+
+#define FW_ISO_CONTEXT_MATCH_TAG0        1
+#define FW_ISO_CONTEXT_MATCH_TAG1        2
+#define FW_ISO_CONTEXT_MATCH_TAG2        4
+#define FW_ISO_CONTEXT_MATCH_TAG3        8
+#define FW_ISO_CONTEXT_MATCH_ALL_TAGS   15
+
+/*
+ * An iso buffer is just a set of pages mapped for DMA in the
+ * specified direction.  Since the pages are to be used for DMA, they
+ * are not mapped into the kernel virtual address space.  We store the
+ * DMA address in the page private. The helper function
+ * fw_iso_buffer_map() will map the pages into a given vma.
+ */
+struct fw_iso_buffer {
+        enum dma_data_direction direction;
+        struct page **pages;
+        int page_count;
+};
+
+int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
+                       int page_count, enum dma_data_direction direction);
+void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card);
+
+struct fw_iso_context;
+typedef void (*fw_iso_callback_t)(struct fw_iso_context *context,
+                                  u32 cycle, size_t header_length,
+                                  void *header, void *data);
+struct fw_iso_context {
+        struct fw_card *card;
+        int type;
+        int channel;
+        int speed;
+        size_t header_size;
+        fw_iso_callback_t callback;
+        void *callback_data;
+};
+
+struct fw_iso_context *fw_iso_context_create(struct fw_card *card,
+                int type, int channel, int speed, size_t header_size,
+                fw_iso_callback_t callback, void *callback_data);
+int fw_iso_context_queue(struct fw_iso_context *ctx,
+                         struct fw_iso_packet *packet,
+                         struct fw_iso_buffer *buffer,
+                         unsigned long payload);
+int fw_iso_context_start(struct fw_iso_context *ctx,
+                         int cycle, int sync, int tags);
+int fw_iso_context_stop(struct fw_iso_context *ctx);
+void fw_iso_context_destroy(struct fw_iso_context *ctx);
+
 #endif /* _LINUX_FIREWIRE_H */