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path: root/drivers/media/common/btcx-risc.c
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-rw-r--r--drivers/media/common/btcx-risc.c260
1 files changed, 260 insertions, 0 deletions
diff --git a/drivers/media/common/btcx-risc.c b/drivers/media/common/btcx-risc.c
new file mode 100644
index 000000000000..ac1b2687a20d
--- /dev/null
+++ b/drivers/media/common/btcx-risc.c
@@ -0,0 +1,260 @@
+/*
+
+ 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 <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;
+module_param(debug, int, 0644);
+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;
+ if (debug) {
+ memcnt--;
+ printk("btcx: riscmem free [%d] dma=%lx\n",
+ memcnt, (unsigned long)risc->dma);
+ }
+ pci_free_consistent(pci, risc->size, risc->cpu, risc->dma);
+ memset(risc,0,sizeof(*risc));
+}
+
+int btcx_riscmem_alloc(struct pci_dev *pci,
+ struct btcx_riscmem *risc,
+ unsigned int size)
+{
+ __le32 *cpu;
+ dma_addr_t dma = 0;
+
+ 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 [%d] dma=%lx cpu=%p size=%d\n",
+ memcnt, (unsigned long)dma, cpu, size);
+ }
+ }
+ 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, 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:
+ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 20:55:13 +0100