drivers/media/video/btcx-risc.c

   1 /*
   2
   3     btcx-risc.c
   4
   5     bt848/bt878/cx2388x risc code generator.
   6
   7     (c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17     GNU General Public License for more details.
  18
  19     You should have received a copy of the GNU General Public License
  20     along with this program; if not, write to the Free Software
  21     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 */
  24
  25 #include <linux/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/init.h>
  28 #include <linux/pci.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/videodev2.h>
  31 #include <asm/page.h>
  32 #include <asm/pgtable.h>
  33
  34 #include "btcx-risc.h"
  35
  36 MODULE_DESCRIPTION("some code shared by bttv and cx88xx drivers");
  37 MODULE_AUTHOR("Gerd Knorr");
  38 MODULE_LICENSE("GPL");
  39
  40 static unsigned int debug = 0;
  41 module_param(debug, int, 0644);
  42 MODULE_PARM_DESC(debug,"debug messages, default is 0 (no)");
  43
  44 /* ---------------------------------------------------------- */
  45 /* allocate/free risc memory                                  */
  46
  47 static int memcnt;
  48
  49 void btcx_riscmem_free(struct pci_dev *pci,
  50                        struct btcx_riscmem *risc)
  51 {
  52         if (NULL == risc->cpu)
  53                 return;
  54         if (debug) {
  55                 memcnt--;
  56                 printk("btcx: riscmem free [%d] dma=%lx\n",
  57                        memcnt, (unsigned long)risc->dma);
  58         }
  59         pci_free_consistent(pci, risc->size, risc->cpu, risc->dma);
  60         memset(risc,0,sizeof(*risc));
  61 }
  62
  63 int btcx_riscmem_alloc(struct pci_dev *pci,
  64                        struct btcx_riscmem *risc,
  65                        unsigned int size)
  66 {
  67         u32 *cpu;
  68         dma_addr_t dma;
  69
  70         if (NULL != risc->cpu && risc->size < size)
  71                 btcx_riscmem_free(pci,risc);
  72         if (NULL == risc->cpu) {
  73                 cpu = pci_alloc_consistent(pci, size, &dma);
  74                 if (NULL == cpu)
  75                         return -ENOMEM;
  76                 risc->cpu  = cpu;
  77                 risc->dma  = dma;
  78                 risc->size = size;
  79                 if (debug) {
  80                         memcnt++;
  81                         printk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
  82                                memcnt, (unsigned long)dma, cpu, size);
  83                 }
  84         }
  85         memset(risc->cpu,0,risc->size);
  86         return 0;
  87 }
  88
  89 /* ---------------------------------------------------------- */
  90 /* screen overlay helpers                                     */
  91
  92 int
  93 btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win,
  94                   struct v4l2_clip *clips, unsigned int n)
  95 {
  96         if (win->left < 0) {
  97                 /* left */
  98                 clips[n].c.left = 0;
  99                 clips[n].c.top = 0;
 100                 clips[n].c.width  = -win->left;
 101                 clips[n].c.height = win->height;
 102                 n++;
 103         }
 104         if (win->left + win->width > swidth) {
 105                 /* right */
 106                 clips[n].c.left   = swidth - win->left;
 107                 clips[n].c.top    = 0;
 108                 clips[n].c.width  = win->width - clips[n].c.left;
 109                 clips[n].c.height = win->height;
 110                 n++;
 111         }
 112         if (win->top < 0) {
 113                 /* top */
 114                 clips[n].c.left = 0;
 115                 clips[n].c.top = 0;
 116                 clips[n].c.width  = win->width;
 117                 clips[n].c.height = -win->top;
 118                 n++;
 119         }
 120         if (win->top + win->height > sheight) {
 121                 /* bottom */
 122                 clips[n].c.left = 0;
 123                 clips[n].c.top = sheight - win->top;
 124                 clips[n].c.width  = win->width;
 125                 clips[n].c.height = win->height - clips[n].c.top;
 126                 n++;
 127         }
 128         return n;
 129 }
 130
 131 int
 132 btcx_align(struct v4l2_rect *win, struct v4l2_clip *clips, unsigned int n, int mask)
 133 {
 134         s32 nx,nw,dx;
 135         unsigned int i;
 136
 137         /* fixup window */
 138         nx = (win->left + mask) & ~mask;
 139         nw = (win->width) & ~mask;
 140         if (nx + nw > win->left + win->width)
 141                 nw -= mask+1;
 142         dx = nx - win->left;
 143         win->left  = nx;
 144         win->width = nw;
 145         if (debug)
 146                 printk(KERN_DEBUG "btcx: window align %dx%d+%d+%d [dx=%d]\n",
 147                        win->width, win->height, win->left, win->top, dx);
 148
 149         /* fixup clips */
 150         for (i = 0; i < n; i++) {
 151                 nx = (clips[i].c.left-dx) & ~mask;
 152                 nw = (clips[i].c.width) & ~mask;
 153                 if (nx + nw < clips[i].c.left-dx + clips[i].c.width)
 154                         nw += mask+1;
 155                 clips[i].c.left  = nx;
 156                 clips[i].c.width = nw;
 157                 if (debug)
 158                         printk(KERN_DEBUG "btcx:   clip align %dx%d+%d+%d\n",
 159                                clips[i].c.width, clips[i].c.height,
 160                                clips[i].c.left, clips[i].c.top);
 161         }
 162         return 0;
 163 }
 164
 165 void
 166 btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips)
 167 {
 168         struct v4l2_clip swap;
 169         int i,j,n;
 170
 171         if (nclips < 2)
 172                 return;
 173         for (i = nclips-2; i >= 0; i--) {
 174                 for (n = 0, j = 0; j <= i; j++) {
 175                         if (clips[j].c.left > clips[j+1].c.left) {
 176                                 swap = clips[j];
 177                                 clips[j] = clips[j+1];
 178                                 clips[j+1] = swap;
 179                                 n++;
 180                         }
 181                 }
 182                 if (0 == n)
 183                         break;
 184         }
 185 }
 186
 187 void
 188 btcx_calc_skips(int line, int width, unsigned int *maxy,
 189                 struct btcx_skiplist *skips, unsigned int *nskips,
 190                 const struct v4l2_clip *clips, unsigned int nclips)
 191 {
 192         unsigned int clip,skip;
 193         int end,maxline;
 194
 195         skip=0;
 196         maxline = 9999;
 197         for (clip = 0; clip < nclips; clip++) {
 198
 199                 /* sanity checks */
 200                 if (clips[clip].c.left + clips[clip].c.width <= 0)
 201                         continue;
 202                 if (clips[clip].c.left > (signed)width)
 203                         break;
 204
 205                 /* vertical range */
 206                 if (line > clips[clip].c.top+clips[clip].c.height-1)
 207                         continue;
 208                 if (line < clips[clip].c.top) {
 209                         if (maxline > clips[clip].c.top-1)
 210                                 maxline = clips[clip].c.top-1;
 211                         continue;
 212                 }
 213                 if (maxline > clips[clip].c.top+clips[clip].c.height-1)
 214                         maxline = clips[clip].c.top+clips[clip].c.height-1;
 215
 216                 /* horizontal range */
 217                 if (0 == skip || clips[clip].c.left > skips[skip-1].end) {
 218                         /* new one */
 219                         skips[skip].start = clips[clip].c.left;
 220                         if (skips[skip].start < 0)
 221                                 skips[skip].start = 0;
 222                         skips[skip].end = clips[clip].c.left + clips[clip].c.width;
 223                         if (skips[skip].end > width)
 224                                 skips[skip].end = width;
 225                         skip++;
 226                 } else {
 227                         /* overlaps -- expand last one */
 228                         end = clips[clip].c.left + clips[clip].c.width;
 229                         if (skips[skip-1].end < end)
 230                                 skips[skip-1].end = end;
 231                         if (skips[skip-1].end > width)
 232                                 skips[skip-1].end = width;
 233                 }
 234         }
 235         *nskips = skip;
 236         *maxy = maxline;
 237
 238         if (debug) {
 239                 printk(KERN_DEBUG "btcx: skips line %d-%d:",line,maxline);
 240                 for (skip = 0; skip < *nskips; skip++) {
 241                         printk(" %d-%d",skips[skip].start,skips[skip].end);
 242                 }
 243                 printk("\n");
 244         }
 245 }
 246
 247 /* ---------------------------------------------------------- */
 248
 249 EXPORT_SYMBOL(btcx_riscmem_alloc);
 250 EXPORT_SYMBOL(btcx_riscmem_free);
 251
 252 EXPORT_SYMBOL(btcx_screen_clips);
 253 EXPORT_SYMBOL(btcx_align);
 254 EXPORT_SYMBOL(btcx_sort_clips);
 255 EXPORT_SYMBOL(btcx_calc_skips);
 256
 257 /*
 258  * Local variables:
 259  * c-basic-offset: 8
 260  * End:
 261  */