/* 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/moduleparam.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_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) { 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 [%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, 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: */