diff options
Diffstat (limited to 'drivers/firewire/fw-transaction.h')
| -rw-r--r-- | drivers/firewire/fw-transaction.h | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h index 8f0283cf1a7..89c6dda2793 100644 --- a/drivers/firewire/fw-transaction.h +++ b/drivers/firewire/fw-transaction.h @@ -27,6 +27,7 @@ #include <linux/interrupt.h> #include <linux/list.h> #include <linux/fs.h> +#include <linux/dma-mapping.h> #define TCODE_WRITE_QUADLET_REQUEST 0 #define TCODE_WRITE_BLOCK_REQUEST 1 @@ -336,6 +337,18 @@ struct fw_iso_context; typedef void (*fw_iso_callback_t) (struct fw_iso_context *context, int status, u32 cycle, void *data); +/* 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; +}; + struct fw_iso_context { struct fw_card *card; int type; @@ -343,19 +356,24 @@ struct fw_iso_context { int speed; fw_iso_callback_t callback; void *callback_data; - - void *buffer; - size_t buffer_size; - dma_addr_t *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); +int +fw_iso_buffer_map(struct fw_iso_buffer *buffer, struct vm_area_struct *vma); +void +fw_iso_buffer_destroy(struct fw_iso_buffer *buffer, struct fw_card *card); + struct fw_iso_context * fw_iso_context_create(struct fw_card *card, int type, - size_t buffer_size, fw_iso_callback_t callback, void *callback_data); + void fw_iso_context_destroy(struct fw_iso_context *ctx); @@ -365,7 +383,9 @@ fw_iso_context_start(struct fw_iso_context *ctx, int fw_iso_context_queue(struct fw_iso_context *ctx, - struct fw_iso_packet *packet, void *payload); + struct fw_iso_packet *packet, + struct fw_iso_buffer *buffer, + unsigned long payload); int fw_iso_context_send(struct fw_iso_context *ctx, @@ -410,7 +430,9 @@ struct fw_card_driver { int (*send_iso)(struct fw_iso_context *ctx, s32 cycle); int (*queue_iso)(struct fw_iso_context *ctx, - struct fw_iso_packet *packet, void *payload); + struct fw_iso_packet *packet, + struct fw_iso_buffer *buffer, + unsigned long payload); }; int |