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/*
btcx-risc.c
bt848/bt878/cx2388x risc code generator.
(c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linuxcomp.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/videodev2.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include "btcx-risc.h"
MODULE_DESCRIPTION
("some code shared by bttv and cx88xx drivers");
MODULE_AUTHOR
("Gerd Knorr");
MODULE_LICENSE
("GPL");
static unsigned int debug
= 0;
MODULE_PARM
(debug
,"i");
MODULE_PARM_DESC
(debug
,"debug messages, default is 0 (no)");
/* ---------------------------------------------------------- */
/* allocate/free risc memory */
static int memcnt
;
void btcx_riscmem_free
(struct pci_dev
*pci
,
struct btcx_riscmem
*risc
)
{
if (NULL
== risc
->cpu
)
return;
pci_free_consistent
(pci
, risc
->size
, risc
->cpu
, risc
->dma
);
memset(risc
,0,sizeof(*risc
));
if (debug
) {
memcnt
--;
printk
("btcx: riscmem free [%d]\n",memcnt
);
}
}
int btcx_riscmem_alloc
(struct pci_dev
*pci
,
struct btcx_riscmem
*risc
,
unsigned int size
)
{
u32
*cpu
;
dma_addr_t dma
;
if (NULL
!= risc
->cpu
&& risc
->size
< size
)
btcx_riscmem_free
(pci
,risc
);
if (NULL
== risc
->cpu
) {
cpu
= pci_alloc_consistent
(pci
, size
, &dma
);
if (NULL
== cpu
)
return -ENOMEM
;
risc
->cpu
= cpu
;
risc
->dma
= dma
;
risc
->size
= size
;
if (debug
) {
memcnt
++;
printk
("btcx: riscmem alloc size=%d [%d]\n",size
,memcnt
);
}
}
memset(risc
->cpu
,0,risc
->size
);
return 0;
}
/* ---------------------------------------------------------- */
/* screen overlay helpers */
int
btcx_screen_clips
(int swidth
, int sheight
, struct v4l2_rect
*win
,
struct v4l2_clip
*clips
, unsigned int n
)
{
if (win
->left
< 0) {
/* left */
clips
[n
].
c.
left = 0;
clips
[n
].
c.
top = 0;
clips
[n
].
c.
width = -win
->left
;
clips
[n
].
c.
height = win
->height
;
n
++;
}
if (win
->left
+ win
->width
> swidth
) {
/* right */
clips
[n
].
c.
left = swidth
- win
->left
;
clips
[n
].
c.
top = 0;
clips
[n
].
c.
width = win
->width
- clips
[n
].
c.
left;
clips
[n
].
c.
height = win
->height
;
n
++;
}
if (win
->top
< 0) {
/* top */
clips
[n
].
c.
left = 0;
clips
[n
].
c.
top = 0;
clips
[n
].
c.
width = win
->width
;
clips
[n
].
c.
height = -win
->top
;
n
++;
}
if (win
->top
+ win
->height
> sheight
) {
/* bottom */
clips
[n
].
c.
left = 0;
clips
[n
].
c.
top = sheight
- win
->top
;
clips
[n
].
c.
width = win
->width
;
clips
[n
].
c.
height = win
->height
- clips
[n
].
c.
top;
n
++;
}
return n
;
}
int
btcx_align
(struct v4l2_rect
*win
, struct v4l2_clip
*clips
, unsigned int n
, int mask
)
{
s32 nx
,nw
,dx
;
unsigned int i
;
/* fixup window */
nx
= (win
->left
+ mask
) & ~mask
;
nw
= (win
->width
) & ~mask
;
if (nx
+ nw
> win
->left
+ win
->width
)
nw
-= mask
+1;
dx
= nx
- win
->left
;
win
->left
= nx
;
win
->width
= nw
;
if (debug
)
printk
(KERN_DEBUG
"btcx: window align %dx%d+%d+%d [dx=%d]\n",
win
->width
, win
->height
, win
->left
, win
->top
, dx
);
/* fixup clips */
for (i
= 0; i
< n
; i
++) {
nx
= (clips
[i
].
c.
left-dx
) & ~mask
;
nw
= (clips
[i
].
c.
width) & ~mask
;
if (nx
+ nw
< clips
[i
].
c.
left-dx
+ clips
[i
].
c.
width)
nw
+= mask
+1;
clips
[i
].
c.
left = nx
;
clips
[i
].
c.
width = nw
;
if (debug
)
printk
(KERN_DEBUG
"btcx: clip align %dx%d+%d+%d\n",
clips
[i
].
c.
width, clips
[i
].
c.
height,
clips
[i
].
c.
left, clips
[i
].
c.
top);
}
return 0;
}
void
btcx_sort_clips
(struct v4l2_clip
*clips
, unsigned int nclips
)
{
struct v4l2_clip swap
;
int i
,j
,n
;
if (nclips
< 2)
return;
for (i
= nclips
-2; i
>= 0; i
--) {
for (n
= 0, j
= 0; j
<= i
; j
++) {
if (clips
[j
].
c.
left > clips
[j
+1].
c.
left) {
swap
= clips
[j
];
clips
[j
] = clips
[j
+1];
clips
[j
+1] = swap
;
n
++;
}
}
if (0 == n
)
break;
}
}
void
btcx_calc_skips
(int line
, int width
, unsigned int *maxy
,
struct btcx_skiplist
*skips
, unsigned int *nskips
,
const struct v4l2_clip
*clips
, unsigned int nclips
)
{
unsigned int clip
,skip
;
int end
,maxline
;
skip
=0;
maxline
= 9999;
for (clip
= 0; clip
< nclips
; clip
++) {
/* sanity checks */
if (clips
[clip
].
c.
left + clips
[clip
].
c.
width <= 0)
continue;
if (clips
[clip
].
c.
left > (signed)width
)
break;
/* vertical range */
if (line
> clips
[clip
].
c.
top+clips
[clip
].
c.
height-1)
continue;
if (line
< clips
[clip
].
c.
top) {
if (maxline
> clips
[clip
].
c.
top-1)
maxline
= clips
[clip
].
c.
top-1;
continue;
}
if (maxline
> clips
[clip
].
c.
top+clips
[clip
].
c.
height-1)
maxline
= clips
[clip
].
c.
top+clips
[clip
].
c.
height-1;
/* horizontal range */
if (0 == skip
|| clips
[clip
].
c.
left > skips
[skip
-1].
end) {
/* new one */
skips
[skip
].
start = clips
[clip
].
c.
left;
if (skips
[skip
].
start < 0)
skips
[skip
].
start = 0;
skips
[skip
].
end = clips
[clip
].
c.
left + clips
[clip
].
c.
width;
if (skips
[skip
].
end > width
)
skips
[skip
].
end = width
;
skip
++;
} else {
/* overlaps -- expand last one */
end
= clips
[clip
].
c.
left + clips
[clip
].
c.
width;
if (skips
[skip
-1].
end < end
)
skips
[skip
-1].
end = end
;
if (skips
[skip
-1].
end > width
)
skips
[skip
-1].
end = width
;
}
}
*nskips
= skip
;
*maxy
= maxline
;
if (debug
) {
printk
(KERN_DEBUG
"btcx: skips line %d-%d:",line
,maxline
);
for (skip
= 0; skip
< *nskips
; skip
++) {
printk
(" %d-%d",skips
[skip
].
start,skips
[skip
].
end);
}
printk
("\n");
}
}
/* ---------------------------------------------------------- */
EXPORT_SYMBOL
(btcx_riscmem_alloc
);
EXPORT_SYMBOL
(btcx_riscmem_free
);
EXPORT_SYMBOL
(btcx_screen_clips
);
EXPORT_SYMBOL
(btcx_align
);
EXPORT_SYMBOL
(btcx_sort_clips
);
EXPORT_SYMBOL
(btcx_calc_skips
);
/*
* Local variables:
* c-basic-offset: 8
* End:
*/