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