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Diffstat (limited to 'drivers/media/video/omap3isp/ispqueue.h')
| -rw-r--r-- | drivers/media/video/omap3isp/ispqueue.h | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/media/video/omap3isp/ispqueue.h b/drivers/media/video/omap3isp/ispqueue.h new file mode 100644 index 00000000000..251de3e1679 --- /dev/null +++ b/drivers/media/video/omap3isp/ispqueue.h @@ -0,0 +1,187 @@ +/* + * ispqueue.h + * + * TI OMAP3 ISP - Video buffers queue handling + * + * Copyright (C) 2010 Nokia Corporation + * + * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * Sakari Ailus <sakari.ailus@iki.fi> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +#ifndef OMAP3_ISP_QUEUE_H +#define OMAP3_ISP_QUEUE_H + +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/videodev2.h> +#include <linux/wait.h> + +struct isp_video_queue; +struct page; +struct scatterlist; + +#define ISP_VIDEO_MAX_BUFFERS 16 + +/** + * enum isp_video_buffer_state - ISP video buffer state + * @ISP_BUF_STATE_IDLE: The buffer is under userspace control (dequeued + * or not queued yet). + * @ISP_BUF_STATE_QUEUED: The buffer has been queued but isn't used by the + * device yet. + * @ISP_BUF_STATE_ACTIVE: The buffer is in use for an active video transfer. + * @ISP_BUF_STATE_ERROR: The device is done with the buffer and an error + * occured. For capture device the buffer likely contains corrupted data or + * no data at all. + * @ISP_BUF_STATE_DONE: The device is done with the buffer and no error occured. + * For capture devices the buffer contains valid data. + */ +enum isp_video_buffer_state { + ISP_BUF_STATE_IDLE, + ISP_BUF_STATE_QUEUED, + ISP_BUF_STATE_ACTIVE, + ISP_BUF_STATE_ERROR, + ISP_BUF_STATE_DONE, +}; + +/** + * struct isp_video_buffer - ISP video buffer + * @vma_use_count: Number of times the buffer is mmap'ed to userspace + * @stream: List head for insertion into main queue + * @queue: ISP buffers queue this buffer belongs to + * @prepared: Whether the buffer has been prepared + * @skip_cache: Whether to skip cache management operations for this buffer + * @vaddr: Memory virtual address (for kernel buffers) + * @vm_flags: Buffer VMA flags (for userspace buffers) + * @offset: Offset inside the first page (for userspace buffers) + * @npages: Number of pages (for userspace buffers) + * @pages: Pages table (for userspace non-VM_PFNMAP buffers) + * @paddr: Memory physical address (for userspace VM_PFNMAP buffers) + * @sglen: Number of elements in the scatter list (for non-VM_PFNMAP buffers) + * @sglist: Scatter list (for non-VM_PFNMAP buffers) + * @vbuf: V4L2 buffer + * @irqlist: List head for insertion into IRQ queue + * @state: Current buffer state + * @wait: Wait queue to signal buffer completion + */ +struct isp_video_buffer { + unsigned long vma_use_count; + struct list_head stream; + struct isp_video_queue *queue; + unsigned int prepared:1; + bool skip_cache; + + /* For kernel buffers. */ + void *vaddr; + + /* For userspace buffers. */ + unsigned long vm_flags; + unsigned long offset; + unsigned int npages; + struct page **pages; + dma_addr_t paddr; + + /* For all buffers except VM_PFNMAP. */ + unsigned int sglen; + struct scatterlist *sglist; + + /* Touched by the interrupt handler. */ + struct v4l2_buffer vbuf; + struct list_head irqlist; + enum isp_video_buffer_state state; + wait_queue_head_t wait; +}; + +#define to_isp_video_buffer(vb) container_of(vb, struct isp_video_buffer, vb) + +/** + * struct isp_video_queue_operations - Driver-specific operations + * @queue_prepare: Called before allocating buffers. Drivers should clamp the + * number of buffers according to their requirements, and must return the + * buffer size in bytes. + * @buffer_prepare: Called the first time a buffer is queued, or after changing + * the userspace memory address for a USERPTR buffer, with the queue lock + * held. Drivers should perform device-specific buffer preparation (such as + * mapping the buffer memory in an IOMMU). This operation is optional. + * @buffer_queue: Called when a buffer is being added to the queue with the + * queue irqlock spinlock held. + * @buffer_cleanup: Called before freeing buffers, or before changing the + * userspace memory address for a USERPTR buffer, with the queue lock held. + * Drivers must perform cleanup operations required to undo the + * buffer_prepare call. This operation is optional. + */ +struct isp_video_queue_operations { + void (*queue_prepare)(struct isp_video_queue *queue, + unsigned int *nbuffers, unsigned int *size); + int (*buffer_prepare)(struct isp_video_buffer *buf); + void (*buffer_queue)(struct isp_video_buffer *buf); + void (*buffer_cleanup)(struct isp_video_buffer *buf); +}; + +/** + * struct isp_video_queue - ISP video buffers queue + * @type: Type of video buffers handled by this queue + * @ops: Queue operations + * @dev: Device used for DMA operations + * @bufsize: Size of a driver-specific buffer object + * @count: Number of currently allocated buffers + * @buffers: ISP video buffers + * @lock: Mutex to protect access to the buffers, main queue and state + * @irqlock: Spinlock to protect access to the IRQ queue + * @streaming: Queue state, indicates whether the queue is streaming + * @queue: List of all queued buffers + */ +struct isp_video_queue { + enum v4l2_buf_type type; + const struct isp_video_queue_operations *ops; + struct device *dev; + unsigned int bufsize; + + unsigned int count; + struct isp_video_buffer *buffers[ISP_VIDEO_MAX_BUFFERS]; + struct mutex lock; + spinlock_t irqlock; + + unsigned int streaming:1; + + struct list_head queue; +}; + +int omap3isp_video_queue_cleanup(struct isp_video_queue *queue); +int omap3isp_video_queue_init(struct isp_video_queue *queue, + enum v4l2_buf_type type, + const struct isp_video_queue_operations *ops, + struct device *dev, unsigned int bufsize); + +int omap3isp_video_queue_reqbufs(struct isp_video_queue *queue, + struct v4l2_requestbuffers *rb); +int omap3isp_video_queue_querybuf(struct isp_video_queue *queue, + struct v4l2_buffer *vbuf); +int omap3isp_video_queue_qbuf(struct isp_video_queue *queue, + struct v4l2_buffer *vbuf); +int omap3isp_video_queue_dqbuf(struct isp_video_queue *queue, + struct v4l2_buffer *vbuf, int nonblocking); +int omap3isp_video_queue_streamon(struct isp_video_queue *queue); +void omap3isp_video_queue_streamoff(struct isp_video_queue *queue); +void omap3isp_video_queue_discard_done(struct isp_video_queue *queue); +int omap3isp_video_queue_mmap(struct isp_video_queue *queue, + struct vm_area_struct *vma); +unsigned int omap3isp_video_queue_poll(struct isp_video_queue *queue, + struct file *file, poll_table *wait); + +#endif /* OMAP3_ISP_QUEUE_H */ |