drivers/media/video/omap3isp/ispqueue.h

   1 /*
   2  * ispqueue.h
   3  *
   4  * TI OMAP3 ISP - Video buffers queue handling
   5  *
   6  * Copyright (C) 2010 Nokia Corporation
   7  *
   8  * Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
   9  *           Sakari Ailus <sakari.ailus@iki.fi>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  23  * 02110-1301 USA
  24  */
  25
  26 #ifndef OMAP3_ISP_QUEUE_H
  27 #define OMAP3_ISP_QUEUE_H
  28
  29 #include <linux/kernel.h>
  30 #include <linux/list.h>
  31 #include <linux/mutex.h>
  32 #include <linux/videodev2.h>
  33 #include <linux/wait.h>
  34
  35 struct isp_video_queue;
  36 struct page;
  37 struct scatterlist;
  38
  39 #define ISP_VIDEO_MAX_BUFFERS           16
  40
  41 /**
  42  * enum isp_video_buffer_state - ISP video buffer state
  43  * @ISP_BUF_STATE_IDLE: The buffer is under userspace control (dequeued
  44  *      or not queued yet).
  45  * @ISP_BUF_STATE_QUEUED: The buffer has been queued but isn't used by the
  46  *      device yet.
  47  * @ISP_BUF_STATE_ACTIVE: The buffer is in use for an active video transfer.
  48  * @ISP_BUF_STATE_ERROR: The device is done with the buffer and an error
  49  *      occurred. For capture device the buffer likely contains corrupted data or
  50  *      no data at all.
  51  * @ISP_BUF_STATE_DONE: The device is done with the buffer and no error occurred.
  52  *      For capture devices the buffer contains valid data.
  53  */
  54 enum isp_video_buffer_state {
  55         ISP_BUF_STATE_IDLE,
  56         ISP_BUF_STATE_QUEUED,
  57         ISP_BUF_STATE_ACTIVE,
  58         ISP_BUF_STATE_ERROR,
  59         ISP_BUF_STATE_DONE,
  60 };
  61
  62 /**
  63  * struct isp_video_buffer - ISP video buffer
  64  * @vma_use_count: Number of times the buffer is mmap'ed to userspace
  65  * @stream: List head for insertion into main queue
  66  * @queue: ISP buffers queue this buffer belongs to
  67  * @prepared: Whether the buffer has been prepared
  68  * @skip_cache: Whether to skip cache management operations for this buffer
  69  * @vaddr: Memory virtual address (for kernel buffers)
  70  * @vm_flags: Buffer VMA flags (for userspace buffers)
  71  * @offset: Offset inside the first page (for userspace buffers)
  72  * @npages: Number of pages (for userspace buffers)
  73  * @pages: Pages table (for userspace non-VM_PFNMAP buffers)
  74  * @paddr: Memory physical address (for userspace VM_PFNMAP buffers)
  75  * @sglen: Number of elements in the scatter list (for non-VM_PFNMAP buffers)
  76  * @sglist: Scatter list (for non-VM_PFNMAP buffers)
  77  * @vbuf: V4L2 buffer
  78  * @irqlist: List head for insertion into IRQ queue
  79  * @state: Current buffer state
  80  * @wait: Wait queue to signal buffer completion
  81  */
  82 struct isp_video_buffer {
  83         unsigned long vma_use_count;
  84         struct list_head stream;
  85         struct isp_video_queue *queue;
  86         unsigned int prepared:1;
  87         bool skip_cache;
  88
  89         /* For kernel buffers. */
  90         void *vaddr;
  91
  92         /* For userspace buffers. */
  93         unsigned long vm_flags;
  94         unsigned long offset;
  95         unsigned int npages;
  96         struct page **pages;
  97         dma_addr_t paddr;
  98
  99         /* For all buffers except VM_PFNMAP. */
 100         unsigned int sglen;
 101         struct scatterlist *sglist;
 102
 103         /* Touched by the interrupt handler. */
 104         struct v4l2_buffer vbuf;
 105         struct list_head irqlist;
 106         enum isp_video_buffer_state state;
 107         wait_queue_head_t wait;
 108 };
 109
 110 #define to_isp_video_buffer(vb) container_of(vb, struct isp_video_buffer, vb)
 111
 112 /**
 113  * struct isp_video_queue_operations - Driver-specific operations
 114  * @queue_prepare: Called before allocating buffers. Drivers should clamp the
 115  *      number of buffers according to their requirements, and must return the
 116  *      buffer size in bytes.
 117  * @buffer_prepare: Called the first time a buffer is queued, or after changing
 118  *      the userspace memory address for a USERPTR buffer, with the queue lock
 119  *      held. Drivers should perform device-specific buffer preparation (such as
 120  *      mapping the buffer memory in an IOMMU). This operation is optional.
 121  * @buffer_queue: Called when a buffer is being added to the queue with the
 122  *      queue irqlock spinlock held.
 123  * @buffer_cleanup: Called before freeing buffers, or before changing the
 124  *      userspace memory address for a USERPTR buffer, with the queue lock held.
 125  *      Drivers must perform cleanup operations required to undo the
 126  *      buffer_prepare call. This operation is optional.
 127  */
 128 struct isp_video_queue_operations {
 129         void (*queue_prepare)(struct isp_video_queue *queue,
 130                               unsigned int *nbuffers, unsigned int *size);
 131         int  (*buffer_prepare)(struct isp_video_buffer *buf);
 132         void (*buffer_queue)(struct isp_video_buffer *buf);
 133         void (*buffer_cleanup)(struct isp_video_buffer *buf);
 134 };
 135
 136 /**
 137  * struct isp_video_queue - ISP video buffers queue
 138  * @type: Type of video buffers handled by this queue
 139  * @ops: Queue operations
 140  * @dev: Device used for DMA operations
 141  * @bufsize: Size of a driver-specific buffer object
 142  * @count: Number of currently allocated buffers
 143  * @buffers: ISP video buffers
 144  * @lock: Mutex to protect access to the buffers, main queue and state
 145  * @irqlock: Spinlock to protect access to the IRQ queue
 146  * @streaming: Queue state, indicates whether the queue is streaming
 147  * @queue: List of all queued buffers
 148  */
 149 struct isp_video_queue {
 150         enum v4l2_buf_type type;
 151         const struct isp_video_queue_operations *ops;
 152         struct device *dev;
 153         unsigned int bufsize;
 154
 155         unsigned int count;
 156         struct isp_video_buffer *buffers[ISP_VIDEO_MAX_BUFFERS];
 157         struct mutex lock;
 158         spinlock_t irqlock;
 159
 160         unsigned int streaming:1;
 161
 162         struct list_head queue;
 163 };
 164
 165 int omap3isp_video_queue_cleanup(struct isp_video_queue *queue);
 166 int omap3isp_video_queue_init(struct isp_video_queue *queue,
 167                               enum v4l2_buf_type type,
 168                               const struct isp_video_queue_operations *ops,
 169                               struct device *dev, unsigned int bufsize);
 170
 171 int omap3isp_video_queue_reqbufs(struct isp_video_queue *queue,
 172                                  struct v4l2_requestbuffers *rb);
 173 int omap3isp_video_queue_querybuf(struct isp_video_queue *queue,
 174                                   struct v4l2_buffer *vbuf);
 175 int omap3isp_video_queue_qbuf(struct isp_video_queue *queue,
 176                               struct v4l2_buffer *vbuf);
 177 int omap3isp_video_queue_dqbuf(struct isp_video_queue *queue,
 178                                struct v4l2_buffer *vbuf, int nonblocking);
 179 int omap3isp_video_queue_streamon(struct isp_video_queue *queue);
 180 void omap3isp_video_queue_streamoff(struct isp_video_queue *queue);
 181 void omap3isp_video_queue_discard_done(struct isp_video_queue *queue);
 182 int omap3isp_video_queue_mmap(struct isp_video_queue *queue,
 183                               struct vm_area_struct *vma);
 184 unsigned int omap3isp_video_queue_poll(struct isp_video_queue *queue,
 185                                        struct file *file, poll_table *wait);
 186
 187 #endif /* OMAP3_ISP_QUEUE_H */