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[media] marvell-cam: core code reorganization

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This code shows signs of having been mucked with over the last five years
or so; things were kind of mixed up.  This patch reorders functions into a
more rational organization which, with luck, will facilitate making the
buffer modes selectable at configuration time.  Code movement only: no
functional changes here.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jonathan Corbet 2011-07-08 17:50:46 -03:00 committed by Mauro Carvalho Chehab
parent 983587c821
commit d43dae75cc
1 changed files with 428 additions and 412 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

840
drivers/media/video/marvell-ccic/mcam-core.c
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@ -157,29 +157,20 @@ static struct mcam_format_struct *mcam_find_format(u32 pixelformat)
} }
/* /*
* Start over with DMA buffers - dev_lock needed. * The default format we use until somebody says otherwise.
*/ */
static void mcam_reset_buffers(struct mcam_camera *cam) static const struct v4l2_pix_format mcam_def_pix_format = {
{ .width = VGA_WIDTH,
int i; .height = VGA_HEIGHT,
.pixelformat = V4L2_PIX_FMT_YUYV,
.field = V4L2_FIELD_NONE,
.bytesperline = VGA_WIDTH*2,
.sizeimage = VGA_WIDTH*VGA_HEIGHT*2,
};
cam->next_buf = -1; static const enum v4l2_mbus_pixelcode mcam_def_mbus_code =
for (i = 0; i < cam->nbufs; i++) V4L2_MBUS_FMT_YUYV8_2X8;
clear_bit(i, &cam->flags);
}
static inline int mcam_needs_config(struct mcam_camera *cam)
{
return test_bit(CF_CONFIG_NEEDED, &cam->flags);
}
static void mcam_set_config_needed(struct mcam_camera *cam, int needed)
{
if (needed)
set_bit(CF_CONFIG_NEEDED, &cam->flags);
else
clear_bit(CF_CONFIG_NEEDED, &cam->flags);
}
/* /*
* The two-word DMA descriptor format used by the Armada 610 and like. There * The two-word DMA descriptor format used by the Armada 610 and like. There
@ -210,6 +201,19 @@ static inline struct mcam_vb_buffer *vb_to_mvb(struct vb2_buffer *vb)
return container_of(vb, struct mcam_vb_buffer, vb_buf); return container_of(vb, struct mcam_vb_buffer, vb_buf);
} }
/*
* Hand a completed buffer back to user space.
*/
static void mcam_buffer_done(struct mcam_camera *cam, int frame,
struct vb2_buffer *vbuf)
{
vbuf->v4l2_buf.bytesused = cam->pix_format.sizeimage;
vbuf->v4l2_buf.sequence = cam->buf_seq[frame];
vb2_set_plane_payload(vbuf, 0, cam->pix_format.sizeimage);
vb2_buffer_done(vbuf, VB2_BUF_STATE_DONE);
}
/* /*
* Debugging and related. * Debugging and related.
@ -222,11 +226,109 @@ static inline struct mcam_vb_buffer *vb_to_mvb(struct vb2_buffer *vb)
dev_dbg((cam)->dev, fmt, ##arg); dev_dbg((cam)->dev, fmt, ##arg);
/*
* Flag manipulation helpers
*/
static void mcam_reset_buffers(struct mcam_camera *cam)
{
int i;
cam->next_buf = -1;
for (i = 0; i < cam->nbufs; i++)
clear_bit(i, &cam->flags);
}
static inline int mcam_needs_config(struct mcam_camera *cam)
{
return test_bit(CF_CONFIG_NEEDED, &cam->flags);
}
static void mcam_set_config_needed(struct mcam_camera *cam, int needed)
{
if (needed)
set_bit(CF_CONFIG_NEEDED, &cam->flags);
else
clear_bit(CF_CONFIG_NEEDED, &cam->flags);
}
/* ------------------------------------------------------------------- */ /* ------------------------------------------------------------------- */
/* /*
* Deal with the controller. * Make the controller start grabbing images. Everything must
* be set up before doing this.
*/ */
static void mcam_ctlr_start(struct mcam_camera *cam)
{
/* set_bit performs a read, so no other barrier should be
needed here */
mcam_reg_set_bit(cam, REG_CTRL0, C0_ENABLE);
}
static void mcam_ctlr_stop(struct mcam_camera *cam)
{
mcam_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
}
/* ------------------------------------------------------------------- */
/*
* Code specific to the vmalloc buffer mode.
*/
/*
* Allocate in-kernel DMA buffers for vmalloc mode.
*/
static int mcam_alloc_dma_bufs(struct mcam_camera *cam, int loadtime)
{
int i;
mcam_set_config_needed(cam, 1);
if (loadtime)
cam->dma_buf_size = dma_buf_size;
else
cam->dma_buf_size = cam->pix_format.sizeimage;
if (n_dma_bufs > 3)
n_dma_bufs = 3;
cam->nbufs = 0;
for (i = 0; i < n_dma_bufs; i++) {
cam->dma_bufs[i] = dma_alloc_coherent(cam->dev,
cam->dma_buf_size, cam->dma_handles + i,
GFP_KERNEL);
if (cam->dma_bufs[i] == NULL) {
cam_warn(cam, "Failed to allocate DMA buffer\n");
break;
}
(cam->nbufs)++;
}
switch (cam->nbufs) {
case 1:
dma_free_coherent(cam->dev, cam->dma_buf_size,
cam->dma_bufs[0], cam->dma_handles[0]);
cam->nbufs = 0;
case 0:
cam_err(cam, "Insufficient DMA buffers, cannot operate\n");
return -ENOMEM;
case 2:
if (n_dma_bufs > 2)
cam_warn(cam, "Will limp along with only 2 buffers\n");
break;
}
return 0;
}
static void mcam_free_dma_bufs(struct mcam_camera *cam)
{
int i;
for (i = 0; i < cam->nbufs; i++) {
dma_free_coherent(cam->dev, cam->dma_buf_size,
cam->dma_bufs[i], cam->dma_handles[i]);
cam->dma_bufs[i] = NULL;
}
cam->nbufs = 0;
}
/* /*
* Set up DMA buffers when operating in vmalloc mode * Set up DMA buffers when operating in vmalloc mode
@ -250,6 +352,52 @@ static void mcam_ctlr_dma_vmalloc(struct mcam_camera *cam)
mcam_reg_write(cam, REG_UBAR, 0); /* 32 bits only */ mcam_reg_write(cam, REG_UBAR, 0); /* 32 bits only */
} }
/*
* Copy data out to user space in the vmalloc case
*/
static void mcam_frame_tasklet(unsigned long data)
{
struct mcam_camera *cam = (struct mcam_camera *) data;
int i;
unsigned long flags;
struct mcam_vb_buffer *buf;
spin_lock_irqsave(&cam->dev_lock, flags);
for (i = 0; i < cam->nbufs; i++) {
int bufno = cam->next_buf;
if (cam->state != S_STREAMING || bufno < 0)
break; /* I/O got stopped */
if (++(cam->next_buf) >= cam->nbufs)
cam->next_buf = 0;
if (!test_bit(bufno, &cam->flags))
continue;
if (list_empty(&cam->buffers)) {
singles++;
break; /* Leave it valid, hope for better later */
}
delivered++;
clear_bit(bufno, &cam->flags);
buf = list_first_entry(&cam->buffers, struct mcam_vb_buffer,
queue);
list_del_init(&buf->queue);
/*
* Drop the lock during the big copy. This *should* be safe...
*/
spin_unlock_irqrestore(&cam->dev_lock, flags);
memcpy(vb2_plane_vaddr(&buf->vb_buf, 0), cam->dma_bufs[bufno],
cam->pix_format.sizeimage);
mcam_buffer_done(cam, bufno, &buf->vb_buf);
spin_lock_irqsave(&cam->dev_lock, flags);
}
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
/* ---------------------------------------------------------------------- */
/*
* DMA-contiguous code.
*/
/* /*
* Set up a contiguous buffer for the given frame. Here also is where * Set up a contiguous buffer for the given frame. Here also is where
* the underrun strategy is set: if there is no buffer available, reuse * the underrun strategy is set: if there is no buffer available, reuse
@ -295,6 +443,26 @@ static void mcam_ctlr_dma_contig(struct mcam_camera *cam)
mcam_set_contig_buffer(cam, 1); mcam_set_contig_buffer(cam, 1);
} }
/*
* Frame completion handling.
*/
static void mcam_dma_contig_done(struct mcam_camera *cam, int frame)
{
struct mcam_vb_buffer *buf = cam->vb_bufs[frame];
if (!test_bit(CF_SINGLE_BUFFER, &cam->flags)) {
delivered++;
mcam_buffer_done(cam, frame, &buf->vb_buf);
}
mcam_set_contig_buffer(cam, frame);
}
/* ---------------------------------------------------------------------- */
/*
* Scatter/gather-specific code.
*/
/* /*
* Set up the next buffer for S/G I/O; caller should be sure that * Set up the next buffer for S/G I/O; caller should be sure that
@ -325,8 +493,74 @@ static void mcam_ctlr_dma_sg(struct mcam_camera *cam)
cam->nbufs = 3; cam->nbufs = 3;
} }
/* /*
* Image format setup, independent of DMA scheme. * Frame completion with S/G is trickier. We can't muck with
* a descriptor chain on the fly, since the controller buffers it
* internally. So we have to actually stop and restart; Marvell
* says this is the way to do it.
*
* Of course, stopping is easier said than done; experience shows
* that the controller can start a frame *after* C0_ENABLE has been
* cleared. So when running in S/G mode, the controller is "stopped"
* on receipt of the start-of-frame interrupt. That means we can
* safely change the DMA descriptor array here and restart things
* (assuming there's another buffer waiting to go).
*/
static void mcam_dma_sg_done(struct mcam_camera *cam, int frame)
{
struct mcam_vb_buffer *buf = cam->vb_bufs[0];
/*
* Very Bad Not Good Things happen if you don't clear
* C1_DESC_ENA before making any descriptor changes.
*/
mcam_reg_clear_bit(cam, REG_CTRL1, C1_DESC_ENA);
/*
* If we have another buffer available, put it in and
* restart the engine.
*/
if (!list_empty(&cam->buffers)) {
mcam_sg_next_buffer(cam);
mcam_reg_set_bit(cam, REG_CTRL1, C1_DESC_ENA);
mcam_ctlr_start(cam);
/*
* Otherwise set CF_SG_RESTART and the controller will
* be restarted once another buffer shows up.
*/
} else {
set_bit(CF_SG_RESTART, &cam->flags);
singles++;
}
/*
* Now we can give the completed frame back to user space.
*/
delivered++;
mcam_buffer_done(cam, frame, &buf->vb_buf);
}
/*
* Scatter/gather mode requires stopping the controller between
* frames so we can put in a new DMA descriptor array. If no new
* buffer exists at frame completion, the controller is left stopped;
* this function is charged with gettig things going again.
*/
static void mcam_sg_restart(struct mcam_camera *cam)
{
mcam_ctlr_dma_sg(cam);
mcam_ctlr_start(cam);
clear_bit(CF_SG_RESTART, &cam->flags);
}
/* ---------------------------------------------------------------------- */
/*
* Buffer-mode-independent controller code.
*/
/*
* Image format setup
*/ */
static void mcam_ctlr_image(struct mcam_camera *cam) static void mcam_ctlr_image(struct mcam_camera *cam)
{ {
@ -417,34 +651,7 @@ static void mcam_ctlr_irq_disable(struct mcam_camera *cam)
mcam_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS); mcam_reg_clear_bit(cam, REG_IRQMASK, FRAMEIRQS);
} }
/*
* Make the controller start grabbing images. Everything must
* be set up before doing this.
*/
static void mcam_ctlr_start(struct mcam_camera *cam)
{
/* set_bit performs a read, so no other barrier should be
needed here */
mcam_reg_set_bit(cam, REG_CTRL0, C0_ENABLE);
}
static void mcam_ctlr_stop(struct mcam_camera *cam)
{
mcam_reg_clear_bit(cam, REG_CTRL0, C0_ENABLE);
}
/*
* Scatter/gather mode requires stopping the controller between
* frames so we can put in a new DMA descriptor array. If no new
* buffer exists at frame completion, the controller is left stopped;
* this function is charged with gettig things going again.
*/
static void mcam_sg_restart(struct mcam_camera *cam)
{
mcam_ctlr_dma_sg(cam);
mcam_ctlr_start(cam);
clear_bit(CF_SG_RESTART, &cam->flags);
}
static void mcam_ctlr_init(struct mcam_camera *cam) static void mcam_ctlr_init(struct mcam_camera *cam)
{ {
@ -603,75 +810,6 @@ static int mcam_cam_configure(struct mcam_camera *cam)
return ret; return ret;
} }
/* -------------------------------------------------------------------- */
/*
* DMA buffer management. These functions need s_mutex held.
*/
/*
* Allocate in-kernel DMA buffers for vmalloc mode.
*/
static int mcam_alloc_dma_bufs(struct mcam_camera *cam, int loadtime)
{
int i;
mcam_set_config_needed(cam, 1);
if (loadtime)
cam->dma_buf_size = dma_buf_size;
else
cam->dma_buf_size = cam->pix_format.sizeimage;
if (n_dma_bufs > 3)
n_dma_bufs = 3;
cam->nbufs = 0;
for (i = 0; i < n_dma_bufs; i++) {
cam->dma_bufs[i] = dma_alloc_coherent(cam->dev,
cam->dma_buf_size, cam->dma_handles + i,
GFP_KERNEL);
if (cam->dma_bufs[i] == NULL) {
cam_warn(cam, "Failed to allocate DMA buffer\n");
break;
}
(cam->nbufs)++;
}
switch (cam->nbufs) {
case 1:
dma_free_coherent(cam->dev, cam->dma_buf_size,
cam->dma_bufs[0], cam->dma_handles[0]);
cam->nbufs = 0;
case 0:
cam_err(cam, "Insufficient DMA buffers, cannot operate\n");
return -ENOMEM;
case 2:
if (n_dma_bufs > 2)
cam_warn(cam, "Will limp along with only 2 buffers\n");
break;
}
return 0;
}
static void mcam_free_dma_bufs(struct mcam_camera *cam)
{
int i;
for (i = 0; i < cam->nbufs; i++) {
dma_free_coherent(cam->dev, cam->dma_buf_size,
cam->dma_bufs[i], cam->dma_handles[i]);
cam->dma_bufs[i] = NULL;
}
cam->nbufs = 0;
}
/* ----------------------------------------------------------------------- */
/*
* Here starts the V4L2 interface code.
*/
/* /*
* Get everything ready, and start grabbing frames. * Get everything ready, and start grabbing frames.
*/ */
@ -728,44 +866,6 @@ static int mcam_vb_queue_setup(struct vb2_queue *vq, unsigned int *nbufs,
return 0; return 0;
} }
/* DMA_sg only */
static int mcam_vb_sg_buf_init(struct vb2_buffer *vb)
{
struct mcam_vb_buffer *mvb = vb_to_mvb(vb);
struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
int ndesc = cam->pix_format.sizeimage/PAGE_SIZE + 1;
mvb->dma_desc = dma_alloc_coherent(cam->dev,
ndesc * sizeof(struct mcam_dma_desc),
&mvb->dma_desc_pa, GFP_KERNEL);
if (mvb->dma_desc == NULL) {
cam_err(cam, "Unable to get DMA descriptor array\n");
return -ENOMEM;
}
return 0;
}
static int mcam_vb_sg_buf_prepare(struct vb2_buffer *vb)
{
struct mcam_vb_buffer *mvb = vb_to_mvb(vb);
struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
struct vb2_dma_sg_desc *sgd = vb2_dma_sg_plane_desc(vb, 0);
struct mcam_dma_desc *desc = mvb->dma_desc;
struct scatterlist *sg;
int i;
mvb->dma_desc_nent = dma_map_sg(cam->dev, sgd->sglist, sgd->num_pages,
DMA_FROM_DEVICE);
if (mvb->dma_desc_nent <= 0)
return -EIO; /* Not sure what's right here */
for_each_sg(sgd->sglist, sg, mvb->dma_desc_nent, i) {
desc->dma_addr = sg_dma_address(sg);
desc->segment_len = sg_dma_len(sg);
desc++;
}
return 0;
}
static void mcam_vb_buf_queue(struct vb2_buffer *vb) static void mcam_vb_buf_queue(struct vb2_buffer *vb)
{ {
@ -785,26 +885,6 @@ static void mcam_vb_buf_queue(struct vb2_buffer *vb)
} }
static int mcam_vb_sg_buf_finish(struct vb2_buffer *vb)
{
struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
struct vb2_dma_sg_desc *sgd = vb2_dma_sg_plane_desc(vb, 0);
dma_unmap_sg(cam->dev, sgd->sglist, sgd->num_pages, DMA_FROM_DEVICE);
return 0;
}
static void mcam_vb_sg_buf_cleanup(struct vb2_buffer *vb)
{
struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
struct mcam_vb_buffer *mvb = vb_to_mvb(vb);
int ndesc = cam->pix_format.sizeimage/PAGE_SIZE + 1;
dma_free_coherent(cam->dev, ndesc * sizeof(struct mcam_dma_desc),
mvb->dma_desc, mvb->dma_desc_pa);
}
/* /*
* vb2 uses these to release the mutex when waiting in dqbuf. I'm * vb2 uses these to release the mutex when waiting in dqbuf. I'm
* not actually sure we need to do this (I'm not sure that vb2_dqbuf() needs * not actually sure we need to do this (I'm not sure that vb2_dqbuf() needs
@ -882,8 +962,66 @@ static const struct vb2_ops mcam_vb2_ops = {
}; };
/* /*
* Scatter/gather mode complicates things somewhat. * Scatter/gather mode uses all of the above functions plus a
* few extras to deal with DMA mapping.
*/ */
static int mcam_vb_sg_buf_init(struct vb2_buffer *vb)
{
struct mcam_vb_buffer *mvb = vb_to_mvb(vb);
struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
int ndesc = cam->pix_format.sizeimage/PAGE_SIZE + 1;
mvb->dma_desc = dma_alloc_coherent(cam->dev,
ndesc * sizeof(struct mcam_dma_desc),
&mvb->dma_desc_pa, GFP_KERNEL);
if (mvb->dma_desc == NULL) {
cam_err(cam, "Unable to get DMA descriptor array\n");
return -ENOMEM;
}
return 0;
}
static int mcam_vb_sg_buf_prepare(struct vb2_buffer *vb)
{
struct mcam_vb_buffer *mvb = vb_to_mvb(vb);
struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
struct vb2_dma_sg_desc *sgd = vb2_dma_sg_plane_desc(vb, 0);
struct mcam_dma_desc *desc = mvb->dma_desc;
struct scatterlist *sg;
int i;
mvb->dma_desc_nent = dma_map_sg(cam->dev, sgd->sglist, sgd->num_pages,
DMA_FROM_DEVICE);
if (mvb->dma_desc_nent <= 0)
return -EIO; /* Not sure what's right here */
for_each_sg(sgd->sglist, sg, mvb->dma_desc_nent, i) {
desc->dma_addr = sg_dma_address(sg);
desc->segment_len = sg_dma_len(sg);
desc++;
}
return 0;
}
static int mcam_vb_sg_buf_finish(struct vb2_buffer *vb)
{
struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
struct vb2_dma_sg_desc *sgd = vb2_dma_sg_plane_desc(vb, 0);
dma_unmap_sg(cam->dev, sgd->sglist, sgd->num_pages, DMA_FROM_DEVICE);
return 0;
}
static void mcam_vb_sg_buf_cleanup(struct vb2_buffer *vb)
{
struct mcam_camera *cam = vb2_get_drv_priv(vb->vb2_queue);
struct mcam_vb_buffer *mvb = vb_to_mvb(vb);
int ndesc = cam->pix_format.sizeimage/PAGE_SIZE + 1;
dma_free_coherent(cam->dev, ndesc * sizeof(struct mcam_dma_desc),
mvb->dma_desc, mvb->dma_desc_pa);
}
static const struct vb2_ops mcam_vb2_sg_ops = { static const struct vb2_ops mcam_vb2_sg_ops = {
.queue_setup = mcam_vb_queue_setup, .queue_setup = mcam_vb_queue_setup,
.buf_init = mcam_vb_sg_buf_init, .buf_init = mcam_vb_sg_buf_init,
@ -934,23 +1072,10 @@ static void mcam_cleanup_vb2(struct mcam_camera *cam)
vb2_dma_contig_cleanup_ctx(cam->vb_alloc_ctx); vb2_dma_contig_cleanup_ctx(cam->vb_alloc_ctx);
} }
static ssize_t mcam_v4l_read(struct file *filp,
char __user *buffer, size_t len, loff_t *pos)
{
struct mcam_camera *cam = filp->private_data;
int ret;
mutex_lock(&cam->s_mutex);
ret = vb2_read(&cam->vb_queue, buffer, len, pos,
filp->f_flags & O_NONBLOCK);
mutex_unlock(&cam->s_mutex);
return ret;
}
/* ---------------------------------------------------------------------- */
/* /*
* Streaming I/O support. * The long list of V4L2 ioctl() operations.
*/ */
static int mcam_vidioc_streamon(struct file *filp, void *priv, static int mcam_vidioc_streamon(struct file *filp, void *priv,
@ -1029,80 +1154,6 @@ static int mcam_vidioc_dqbuf(struct file *filp, void *priv,
} }
static int mcam_v4l_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct mcam_camera *cam = filp->private_data;
int ret;
mutex_lock(&cam->s_mutex);
ret = vb2_mmap(&cam->vb_queue, vma);
mutex_unlock(&cam->s_mutex);
return ret;
}
static int mcam_v4l_open(struct file *filp)
{
struct mcam_camera *cam = video_drvdata(filp);
int ret = 0;
filp->private_data = cam;
frames = singles = delivered = 0;
mutex_lock(&cam->s_mutex);
if (cam->users == 0) {
ret = mcam_setup_vb2(cam);
if (ret)
goto out;
mcam_ctlr_power_up(cam);
__mcam_cam_reset(cam);
mcam_set_config_needed(cam, 1);
}
(cam->users)++;
out:
mutex_unlock(&cam->s_mutex);
return ret;
}
static int mcam_v4l_release(struct file *filp)
{
struct mcam_camera *cam = filp->private_data;
cam_err(cam, "Release, %d frames, %d singles, %d delivered\n", frames,
singles, delivered);
mutex_lock(&cam->s_mutex);
(cam->users)--;
if (filp == cam->owner) {
mcam_ctlr_stop_dma(cam);
cam->owner = NULL;
}
if (cam->users == 0) {
mcam_cleanup_vb2(cam);
mcam_ctlr_power_down(cam);
if (cam->buffer_mode == B_vmalloc && alloc_bufs_at_read)
mcam_free_dma_bufs(cam);
}
mutex_unlock(&cam->s_mutex);
return 0;
}
static unsigned int mcam_v4l_poll(struct file *filp,
struct poll_table_struct *pt)
{
struct mcam_camera *cam = filp->private_data;
int ret;
mutex_lock(&cam->s_mutex);
ret = vb2_poll(&cam->vb_queue, filp, pt);
mutex_unlock(&cam->s_mutex);
return ret;
}
static int mcam_vidioc_queryctrl(struct file *filp, void *priv, static int mcam_vidioc_queryctrl(struct file *filp, void *priv,
struct v4l2_queryctrl *qc) struct v4l2_queryctrl *qc)
@ -1155,21 +1206,6 @@ static int mcam_vidioc_querycap(struct file *file, void *priv,
} }
/*
* The default format we use until somebody says otherwise.
*/
static const struct v4l2_pix_format mcam_def_pix_format = {
.width = VGA_WIDTH,
.height = VGA_HEIGHT,
.pixelformat = V4L2_PIX_FMT_YUYV,
.field = V4L2_FIELD_NONE,
.bytesperline = VGA_WIDTH*2,
.sizeimage = VGA_WIDTH*VGA_HEIGHT*2,
};
static const enum v4l2_mbus_pixelcode mcam_def_mbus_code =
V4L2_MBUS_FMT_YUYV8_2X8;
static int mcam_vidioc_enum_fmt_vid_cap(struct file *filp, static int mcam_vidioc_enum_fmt_vid_cap(struct file *filp,
void *priv, struct v4l2_fmtdesc *fmt) void *priv, struct v4l2_fmtdesc *fmt)
{ {
@ -1395,21 +1431,6 @@ static int mcam_vidioc_s_register(struct file *file, void *priv,
} }
#endif #endif
/*
* This template device holds all of those v4l2 methods; we
* clone it for specific real devices.
*/
static const struct v4l2_file_operations mcam_v4l_fops = {
.owner = THIS_MODULE,
.open = mcam_v4l_open,
.release = mcam_v4l_release,
.read = mcam_v4l_read,
.poll = mcam_v4l_poll,
.mmap = mcam_v4l_mmap,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops mcam_v4l_ioctl_ops = { static const struct v4l2_ioctl_ops mcam_v4l_ioctl_ops = {
.vidioc_querycap = mcam_vidioc_querycap, .vidioc_querycap = mcam_vidioc_querycap,
.vidioc_enum_fmt_vid_cap = mcam_vidioc_enum_fmt_vid_cap, .vidioc_enum_fmt_vid_cap = mcam_vidioc_enum_fmt_vid_cap,
@ -1440,6 +1461,112 @@ static const struct v4l2_ioctl_ops mcam_v4l_ioctl_ops = {
#endif #endif
}; };
/* ---------------------------------------------------------------------- */
/*
* Our various file operations.
*/
static int mcam_v4l_open(struct file *filp)
{
struct mcam_camera *cam = video_drvdata(filp);
int ret = 0;
filp->private_data = cam;
frames = singles = delivered = 0;
mutex_lock(&cam->s_mutex);
if (cam->users == 0) {
ret = mcam_setup_vb2(cam);
if (ret)
goto out;
mcam_ctlr_power_up(cam);
__mcam_cam_reset(cam);
mcam_set_config_needed(cam, 1);
}
(cam->users)++;
out:
mutex_unlock(&cam->s_mutex);
return ret;
}
static int mcam_v4l_release(struct file *filp)
{
struct mcam_camera *cam = filp->private_data;
cam_err(cam, "Release, %d frames, %d singles, %d delivered\n", frames,
singles, delivered);
mutex_lock(&cam->s_mutex);
(cam->users)--;
if (filp == cam->owner) {
mcam_ctlr_stop_dma(cam);
cam->owner = NULL;
}
if (cam->users == 0) {
mcam_cleanup_vb2(cam);
mcam_ctlr_power_down(cam);
if (cam->buffer_mode == B_vmalloc && alloc_bufs_at_read)
mcam_free_dma_bufs(cam);
}
mutex_unlock(&cam->s_mutex);
return 0;
}
static ssize_t mcam_v4l_read(struct file *filp,
char __user *buffer, size_t len, loff_t *pos)
{
struct mcam_camera *cam = filp->private_data;
int ret;
mutex_lock(&cam->s_mutex);
ret = vb2_read(&cam->vb_queue, buffer, len, pos,
filp->f_flags & O_NONBLOCK);
mutex_unlock(&cam->s_mutex);
return ret;
}
static unsigned int mcam_v4l_poll(struct file *filp,
struct poll_table_struct *pt)
{
struct mcam_camera *cam = filp->private_data;
int ret;
mutex_lock(&cam->s_mutex);
ret = vb2_poll(&cam->vb_queue, filp, pt);
mutex_unlock(&cam->s_mutex);
return ret;
}
static int mcam_v4l_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct mcam_camera *cam = filp->private_data;
int ret;
mutex_lock(&cam->s_mutex);
ret = vb2_mmap(&cam->vb_queue, vma);
mutex_unlock(&cam->s_mutex);
return ret;
}
static const struct v4l2_file_operations mcam_v4l_fops = {
.owner = THIS_MODULE,
.open = mcam_v4l_open,
.release = mcam_v4l_release,
.read = mcam_v4l_read,
.poll = mcam_v4l_poll,
.mmap = mcam_v4l_mmap,
.unlocked_ioctl = video_ioctl2,
};
/*
* This template device holds all of those v4l2 methods; we
* clone it for specific real devices.
*/
static struct video_device mcam_v4l_template = { static struct video_device mcam_v4l_template = {
.name = "mcam", .name = "mcam",
.tvnorms = V4L2_STD_NTSC_M, .tvnorms = V4L2_STD_NTSC_M,
@ -1454,119 +1581,6 @@ static struct video_device mcam_v4l_template = {
/* /*
* Interrupt handler stuff * Interrupt handler stuff
*/ */
static void mcam_buffer_done(struct mcam_camera *cam, int frame,
struct vb2_buffer *vbuf)
{
vbuf->v4l2_buf.bytesused = cam->pix_format.sizeimage;
vbuf->v4l2_buf.sequence = cam->buf_seq[frame];
vb2_set_plane_payload(vbuf, 0, cam->pix_format.sizeimage);
vb2_buffer_done(vbuf, VB2_BUF_STATE_DONE);
}
/*
* Copy data out to user space in the vmalloc case
*/
static void mcam_frame_tasklet(unsigned long data)
{
struct mcam_camera *cam = (struct mcam_camera *) data;
int i;
unsigned long flags;
struct mcam_vb_buffer *buf;
spin_lock_irqsave(&cam->dev_lock, flags);
for (i = 0; i < cam->nbufs; i++) {
int bufno = cam->next_buf;
if (cam->state != S_STREAMING || bufno < 0)
break; /* I/O got stopped */
if (++(cam->next_buf) >= cam->nbufs)
cam->next_buf = 0;
if (!test_bit(bufno, &cam->flags))
continue;
if (list_empty(&cam->buffers)) {
singles++;
break; /* Leave it valid, hope for better later */
}
delivered++;
clear_bit(bufno, &cam->flags);
buf = list_first_entry(&cam->buffers, struct mcam_vb_buffer,
queue);
list_del_init(&buf->queue);
/*
* Drop the lock during the big copy. This *should* be safe...
*/
spin_unlock_irqrestore(&cam->dev_lock, flags);
memcpy(vb2_plane_vaddr(&buf->vb_buf, 0), cam->dma_bufs[bufno],
cam->pix_format.sizeimage);
mcam_buffer_done(cam, bufno, &buf->vb_buf);
spin_lock_irqsave(&cam->dev_lock, flags);
}
spin_unlock_irqrestore(&cam->dev_lock, flags);
}
/*
* For direct DMA, mark the buffer ready and set up another one.
*/
static void mcam_dma_contig_done(struct mcam_camera *cam, int frame)
{
struct mcam_vb_buffer *buf = cam->vb_bufs[frame];
if (!test_bit(CF_SINGLE_BUFFER, &cam->flags)) {
delivered++;
mcam_buffer_done(cam, frame, &buf->vb_buf);
}
mcam_set_contig_buffer(cam, frame);
}
/*
* Frame completion with S/G is trickier. We can't muck with
* a descriptor chain on the fly, since the controller buffers it
* internally. So we have to actually stop and restart; Marvell
* says this is the way to do it.
*
* Of course, stopping is easier said than done; experience shows
* that the controller can start a frame *after* C0_ENABLE has been
* cleared. So when running in S/G mode, the controller is "stopped"
* on receipt of the start-of-frame interrupt. That means we can
* safely change the DMA descriptor array here and restart things
* (assuming there's another buffer waiting to go).
*/
static void mcam_dma_sg_done(struct mcam_camera *cam, int frame)
{
struct mcam_vb_buffer *buf = cam->vb_bufs[0];
/*
* Very Bad Not Good Things happen if you don't clear
* C1_DESC_ENA before making any descriptor changes.
*/
mcam_reg_clear_bit(cam, REG_CTRL1, C1_DESC_ENA);
/*
* If we have another buffer available, put it in and
* restart the engine.
*/
if (!list_empty(&cam->buffers)) {
mcam_sg_next_buffer(cam);
mcam_reg_set_bit(cam, REG_CTRL1, C1_DESC_ENA);
mcam_ctlr_start(cam);
/*
* Otherwise set CF_SG_RESTART and the controller will
* be restarted once another buffer shows up.
*/
} else {
set_bit(CF_SG_RESTART, &cam->flags);
singles++;
}
/*
* Now we can give the completed frame back to user space.
*/
delivered++;
mcam_buffer_done(cam, frame, &buf->vb_buf);
}
static void mcam_frame_complete(struct mcam_camera *cam, int frame) static void mcam_frame_complete(struct mcam_camera *cam, int frame)
{ {
/* /*
@ -1600,8 +1614,10 @@ static void mcam_frame_complete(struct mcam_camera *cam, int frame)
} }
/*
* The interrupt handler; this needs to be called from the
* platform irq handler with the lock held.
*/
int mccic_irq(struct mcam_camera *cam, unsigned int irqs) int mccic_irq(struct mcam_camera *cam, unsigned int irqs)
{ {
unsigned int frame, handled = 0; unsigned int frame, handled = 0;
@ -1636,10 +1652,10 @@ int mccic_irq(struct mcam_camera *cam, unsigned int irqs)
return handled; return handled;
} }
/* ---------------------------------------------------------------------- */
/* /*
* Registration and such. * Registration and such.
*/ */
static struct ov7670_config sensor_cfg = { static struct ov7670_config sensor_cfg = {
/* /*
* Exclude QCIF mode, because it only captures a tiny portion * Exclude QCIF mode, because it only captures a tiny portion