261 lines
6.3 KiB
C
261 lines
6.3 KiB
C
/*
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btcx-risc.c
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bt848/bt878/cx2388x risc code generator.
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(c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
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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 as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <linux/videodev2.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include "btcx-risc.h"
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MODULE_DESCRIPTION("some code shared by bttv and cx88xx drivers");
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MODULE_AUTHOR("Gerd Knorr");
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MODULE_LICENSE("GPL");
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static unsigned int debug;
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module_param(debug, int, 0644);
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MODULE_PARM_DESC(debug,"debug messages, default is 0 (no)");
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/* ---------------------------------------------------------- */
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/* allocate/free risc memory */
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static int memcnt;
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void btcx_riscmem_free(struct pci_dev *pci,
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struct btcx_riscmem *risc)
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{
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if (NULL == risc->cpu)
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return;
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if (debug) {
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memcnt--;
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printk("btcx: riscmem free [%d] dma=%lx\n",
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memcnt, (unsigned long)risc->dma);
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}
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pci_free_consistent(pci, risc->size, risc->cpu, risc->dma);
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memset(risc,0,sizeof(*risc));
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}
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int btcx_riscmem_alloc(struct pci_dev *pci,
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struct btcx_riscmem *risc,
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unsigned int size)
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{
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__le32 *cpu;
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dma_addr_t dma = 0;
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if (NULL != risc->cpu && risc->size < size)
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btcx_riscmem_free(pci,risc);
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if (NULL == risc->cpu) {
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cpu = pci_alloc_consistent(pci, size, &dma);
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if (NULL == cpu)
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return -ENOMEM;
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risc->cpu = cpu;
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risc->dma = dma;
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risc->size = size;
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if (debug) {
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memcnt++;
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printk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
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memcnt, (unsigned long)dma, cpu, size);
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}
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}
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memset(risc->cpu,0,risc->size);
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return 0;
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}
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/* ---------------------------------------------------------- */
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/* screen overlay helpers */
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int
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btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win,
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struct v4l2_clip *clips, unsigned int n)
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{
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if (win->left < 0) {
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/* left */
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clips[n].c.left = 0;
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clips[n].c.top = 0;
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clips[n].c.width = -win->left;
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clips[n].c.height = win->height;
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n++;
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}
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if (win->left + win->width > swidth) {
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/* right */
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clips[n].c.left = swidth - win->left;
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clips[n].c.top = 0;
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clips[n].c.width = win->width - clips[n].c.left;
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clips[n].c.height = win->height;
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n++;
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}
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if (win->top < 0) {
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/* top */
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clips[n].c.left = 0;
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clips[n].c.top = 0;
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clips[n].c.width = win->width;
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clips[n].c.height = -win->top;
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n++;
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}
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if (win->top + win->height > sheight) {
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/* bottom */
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clips[n].c.left = 0;
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clips[n].c.top = sheight - win->top;
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clips[n].c.width = win->width;
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clips[n].c.height = win->height - clips[n].c.top;
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n++;
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}
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return n;
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}
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int
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btcx_align(struct v4l2_rect *win, struct v4l2_clip *clips, unsigned int n, int mask)
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{
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s32 nx,nw,dx;
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unsigned int i;
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/* fixup window */
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nx = (win->left + mask) & ~mask;
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nw = (win->width) & ~mask;
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if (nx + nw > win->left + win->width)
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nw -= mask+1;
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dx = nx - win->left;
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win->left = nx;
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win->width = nw;
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if (debug)
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printk(KERN_DEBUG "btcx: window align %dx%d+%d+%d [dx=%d]\n",
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win->width, win->height, win->left, win->top, dx);
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/* fixup clips */
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for (i = 0; i < n; i++) {
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nx = (clips[i].c.left-dx) & ~mask;
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nw = (clips[i].c.width) & ~mask;
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if (nx + nw < clips[i].c.left-dx + clips[i].c.width)
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nw += mask+1;
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clips[i].c.left = nx;
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clips[i].c.width = nw;
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if (debug)
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printk(KERN_DEBUG "btcx: clip align %dx%d+%d+%d\n",
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clips[i].c.width, clips[i].c.height,
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clips[i].c.left, clips[i].c.top);
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}
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return 0;
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}
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void
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btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips)
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{
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struct v4l2_clip swap;
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int i,j,n;
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if (nclips < 2)
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return;
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for (i = nclips-2; i >= 0; i--) {
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for (n = 0, j = 0; j <= i; j++) {
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if (clips[j].c.left > clips[j+1].c.left) {
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swap = clips[j];
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clips[j] = clips[j+1];
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clips[j+1] = swap;
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n++;
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}
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}
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if (0 == n)
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break;
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}
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}
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void
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btcx_calc_skips(int line, int width, int *maxy,
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struct btcx_skiplist *skips, unsigned int *nskips,
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const struct v4l2_clip *clips, unsigned int nclips)
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{
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unsigned int clip,skip;
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int end, maxline;
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skip=0;
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maxline = 9999;
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for (clip = 0; clip < nclips; clip++) {
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/* sanity checks */
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if (clips[clip].c.left + clips[clip].c.width <= 0)
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continue;
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if (clips[clip].c.left > (signed)width)
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break;
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/* vertical range */
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if (line > clips[clip].c.top+clips[clip].c.height-1)
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continue;
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if (line < clips[clip].c.top) {
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if (maxline > clips[clip].c.top-1)
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maxline = clips[clip].c.top-1;
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continue;
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}
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if (maxline > clips[clip].c.top+clips[clip].c.height-1)
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maxline = clips[clip].c.top+clips[clip].c.height-1;
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/* horizontal range */
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if (0 == skip || clips[clip].c.left > skips[skip-1].end) {
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/* new one */
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skips[skip].start = clips[clip].c.left;
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if (skips[skip].start < 0)
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skips[skip].start = 0;
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skips[skip].end = clips[clip].c.left + clips[clip].c.width;
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if (skips[skip].end > width)
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skips[skip].end = width;
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skip++;
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} else {
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/* overlaps -- expand last one */
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end = clips[clip].c.left + clips[clip].c.width;
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if (skips[skip-1].end < end)
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skips[skip-1].end = end;
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if (skips[skip-1].end > width)
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skips[skip-1].end = width;
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}
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}
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*nskips = skip;
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*maxy = maxline;
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if (debug) {
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printk(KERN_DEBUG "btcx: skips line %d-%d:",line,maxline);
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for (skip = 0; skip < *nskips; skip++) {
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printk(" %d-%d",skips[skip].start,skips[skip].end);
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}
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printk("\n");
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}
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}
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/* ---------------------------------------------------------- */
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EXPORT_SYMBOL(btcx_riscmem_alloc);
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EXPORT_SYMBOL(btcx_riscmem_free);
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EXPORT_SYMBOL(btcx_screen_clips);
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EXPORT_SYMBOL(btcx_align);
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EXPORT_SYMBOL(btcx_sort_clips);
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EXPORT_SYMBOL(btcx_calc_skips);
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/*
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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