diff options
Diffstat (limited to 'include/linux/firewire.h')
| -rw-r--r-- | include/linux/firewire.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/include/linux/firewire.h b/include/linux/firewire.h index e584b7215e8..9823946adbc 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 */ |