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V4L/DVB (5727): Remove VIVI_SCATTER
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vivi scatter method were used as a proof of concept. It can be
safelly removed from mainstream, since the current method is
faster and better than the previous solution.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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Mauro Carvalho Chehab committed Jul 18, 2007
1 parent 3e0e38e commit 74fa39e
Showing 1 changed file with 0 additions and 163 deletions.
163 changes: 0 additions & 163 deletions drivers/media/video/vivi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -145,9 +145,6 @@ struct vivi_buffer {

struct vivi_fmt *fmt;

#ifdef CONFIG_VIVI_SCATTER
struct sg_to_addr *to_addr;
#endif
};

struct vivi_dmaqueue {
Expand Down Expand Up @@ -232,68 +229,13 @@ static u8 bars[8][3] = {
#define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
#define TSTAMP_MIN_X 64

#ifdef CONFIG_VIVI_SCATTER
static void prep_to_addr(struct sg_to_addr to_addr[],
struct videobuf_buffer *vb)
{
int i, pos=0;

for (i=0;i<vb->dma.nr_pages;i++) {
to_addr[i].sg=&vb->dma.sglist[i];
to_addr[i].pos=pos;
pos += vb->dma.sglist[i].length;
}
}

static int get_addr_pos(int pos, int pages, struct sg_to_addr to_addr[])
{
int p1=0,p2=pages-1,p3=pages/2;

/* Sanity test */
BUG_ON (pos>=to_addr[p2].pos+to_addr[p2].sg->length);

while (p1+1<p2) {
if (pos < to_addr[p3].pos) {
p2=p3;
} else {
p1=p3;
}
p3=(p1+p2)/2;
}
if (pos >= to_addr[p2].pos)
p1=p2;

return (p1);
}
#endif

#ifdef CONFIG_VIVI_SCATTER
static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
int hmax, int line, char *timestr)
#else
static void gen_line(char *basep,int inipos,int wmax,
int hmax, int line, char *timestr)
#endif
{
int w,i,j,pos=inipos,y;
char *p,*s;
u8 chr,r,g,b,color;
#ifdef CONFIG_VIVI_SCATTER
int pgpos,oldpg;
char *basep;
struct page *pg;

unsigned long flags;
spinlock_t spinlock;

spin_lock_init(&spinlock);

/* Get first addr pointed to pixel position */
oldpg=get_addr_pos(pos,pages,to_addr);
pg=pfn_to_page(sg_dma_address(to_addr[oldpg].sg) >> PAGE_SHIFT);
spin_lock_irqsave(&spinlock,flags);
basep = kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[oldpg].sg->offset;
#endif

/* We will just duplicate the second pixel at the packet */
wmax/=2;
Expand All @@ -305,18 +247,7 @@ static void gen_line(char *basep,int inipos,int wmax,
b=bars[w*7/wmax][2];

for (color=0;color<4;color++) {
#ifdef CONFIG_VIVI_SCATTER
pgpos=get_addr_pos(pos,pages,to_addr);
if (pgpos!=oldpg) {
pg=pfn_to_page(sg_dma_address(to_addr[pgpos].sg) >> PAGE_SHIFT);
kunmap_atomic(basep, KM_BOUNCE_READ);
basep= kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[pgpos].sg->offset;
oldpg=pgpos;
}
p=basep+pos-to_addr[pgpos].pos;
#else
p=basep+pos;
#endif

switch (color) {
case 0:
Expand Down Expand Up @@ -361,23 +292,7 @@ static void gen_line(char *basep,int inipos,int wmax,

pos=inipos+j*2;
for (color=0;color<4;color++) {
#ifdef CONFIG_VIVI_SCATTER
pgpos=get_addr_pos(pos,pages,to_addr);
if (pgpos!=oldpg) {
pg=pfn_to_page(sg_dma_address(
to_addr[pgpos].sg)
>> PAGE_SHIFT);
kunmap_atomic(basep,
KM_BOUNCE_READ);
basep= kmap_atomic(pg,
KM_BOUNCE_READ)+
to_addr[pgpos].sg->offset;
oldpg=pgpos;
}
p=basep+pos-to_addr[pgpos].pos;
#else
p=basep+pos;
#endif

y=TO_Y(r,g,b);

Expand All @@ -402,48 +317,24 @@ static void gen_line(char *basep,int inipos,int wmax,


end:
#ifdef CONFIG_VIVI_SCATTER
kunmap_atomic(basep, KM_BOUNCE_READ);
spin_unlock_irqrestore(&spinlock,flags);
#else
return;
#endif
}
static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
{
int h,pos=0;
int hmax = buf->vb.height;
int wmax = buf->vb.width;
struct timeval ts;
#ifdef CONFIG_VIVI_SCATTER
struct sg_to_addr *to_addr=buf->to_addr;
struct videobuf_buffer *vb=&buf->vb;
#else
char *tmpbuf;
#endif

#ifdef CONFIG_VIVI_SCATTER
/* Test if DMA mapping is ready */
if (!sg_dma_address(&vb->dma.sglist[0]))
return;

prep_to_addr(to_addr,vb);

/* Check if there is enough memory */
BUG_ON(buf->vb.dma.nr_pages << PAGE_SHIFT < (buf->vb.width*buf->vb.height)*2);
#else
if (buf->vb.dma.varea) {
tmpbuf=kmalloc (wmax*2, GFP_KERNEL);
} else {
tmpbuf=buf->vb.dma.vmalloc;
}

#endif

for (h=0;h<hmax;h++) {
#ifdef CONFIG_VIVI_SCATTER
gen_line(to_addr,pos,vb->dma.nr_pages,wmax,hmax,h,dev->timestr);
#else
if (buf->vb.dma.varea) {
gen_line(tmpbuf,0,wmax,hmax,h,dev->timestr);
/* FIXME: replacing to __copy_to_user */
Expand All @@ -452,7 +343,6 @@ static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
} else {
gen_line(tmpbuf,pos,wmax,hmax,h,dev->timestr);
}
#endif
pos += wmax*2;
}

Expand Down Expand Up @@ -718,11 +608,6 @@ static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
if (in_interrupt())
BUG();

#ifdef CONFIG_VIVI_SCATTER
/*FIXME: Maybe a spinlock is required here */
kfree(buf->to_addr);
buf->to_addr=NULL;
#endif

videobuf_waiton(&buf->vb,0,0);
videobuf_dma_unmap(vq, &buf->vb.dma);
Expand Down Expand Up @@ -768,12 +653,6 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,

buf->vb.state = STATE_PREPARED;

#ifdef CONFIG_VIVI_SCATTER
if (NULL == (buf->to_addr = kmalloc(sizeof(*buf->to_addr) * vb->dma.nr_pages,GFP_KERNEL))) {
rc=-ENOMEM;
goto fail;
}
#endif
return 0;

fail:
Expand Down Expand Up @@ -838,40 +717,6 @@ static void buffer_release(struct videobuf_queue *vq, struct videobuf_buffer *vb
free_buffer(vq,buf);
}

#ifdef CONFIG_VIVI_SCATTER
static int vivi_map_sg(void *dev, struct scatterlist *sg, int nents,
int direction)
{
int i;

dprintk(1,"%s, number of pages=%d\n",__FUNCTION__,nents);
BUG_ON(direction == DMA_NONE);

for (i = 0; i < nents; i++ ) {
BUG_ON(!sg[i].page);

sg_dma_address(&sg[i]) = page_to_phys(sg[i].page) + sg[i].offset;
}

return nents;
}

static int vivi_unmap_sg(void *dev,struct scatterlist *sglist,int nr_pages,
int direction)
{
dprintk(1,"%s\n",__FUNCTION__);
return 0;
}

static int vivi_dma_sync_sg(void *dev,struct scatterlist *sglist, int nr_pages,
int direction)
{
// dprintk(1,"%s\n",__FUNCTION__);

// flush_write_buffers();
return 0;
}
#endif

static struct videobuf_queue_ops vivi_video_qops = {
.buf_setup = buffer_setup,
Expand Down Expand Up @@ -1260,19 +1105,11 @@ static int vivi_open(struct inode *inode, struct file *file)
sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
dev->h,dev->m,dev->s,(dev->us+500)/1000);

#ifdef CONFIG_VIVI_SCATTER
videobuf_queue_init(&fh->vb_vidq,VIDEOBUF_DMA_SCATTER, &vivi_video_qops,
NULL, NULL,
fh->type,
V4L2_FIELD_INTERLACED,
sizeof(struct vivi_buffer),fh);
#else
videobuf_queue_init(&fh->vb_vidq, &vivi_video_qops,
NULL, NULL,
fh->type,
V4L2_FIELD_INTERLACED,
sizeof(struct vivi_buffer),fh);
#endif

return 0;
}
Expand Down

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