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/init.h> 27 #include <linux/pci.h> 28 #include <linux/interrupt.h> 29 #include <linux/videodev2.h> 30 #include <asm/page.h> 31 #include <asm/pgtable.h> 32 33 #include "btcx-risc.h" 34 35 static unsigned int btcx_debug; 36 module_param(btcx_debug, int, 0644); 37 MODULE_PARM_DESC(btcx_debug,"debug messages, default is 0 (no)"); 38 39 /* ---------------------------------------------------------- */ 40 /* allocate/free risc memory */ 41 42 static int memcnt; 43 44 void btcx_riscmem_free(struct pci_dev *pci, 45 struct btcx_riscmem *risc) 46 { 47 if (NULL == risc->cpu) 48 return; 49 if (btcx_debug) { 50 memcnt--; 51 printk("btcx: riscmem free [%d] dma=%lx\n", 52 memcnt, (unsigned long)risc->dma); 53 } 54 pci_free_consistent(pci, risc->size, risc->cpu, risc->dma); 55 memset(risc,0,sizeof(*risc)); 56 } 57 58 int btcx_riscmem_alloc(struct pci_dev *pci, 59 struct btcx_riscmem *risc, 60 unsigned int size) 61 { 62 __le32 *cpu; 63 dma_addr_t dma = 0; 64 65 if (NULL != risc->cpu && risc->size < size) 66 btcx_riscmem_free(pci,risc); 67 if (NULL == risc->cpu) { 68 cpu = pci_alloc_consistent(pci, size, &dma); 69 if (NULL == cpu) 70 return -ENOMEM; 71 risc->cpu = cpu; 72 risc->dma = dma; 73 risc->size = size; 74 if (btcx_debug) { 75 memcnt++; 76 printk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n", 77 memcnt, (unsigned long)dma, cpu, size); 78 } 79 } 80 memset(risc->cpu,0,risc->size); 81 return 0; 82 } 83 84 /* ---------------------------------------------------------- */ 85 /* screen overlay helpers */ 86 87 int 88 btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win, 89 struct v4l2_clip *clips, unsigned int n) 90 { 91 if (win->left < 0) { 92 /* left */ 93 clips[n].c.left = 0; 94 clips[n].c.top = 0; 95 clips[n].c.width = -win->left; 96 clips[n].c.height = win->height; 97 n++; 98 } 99 if (win->left + win->width > swidth) { 100 /* right */ 101 clips[n].c.left = swidth - win->left; 102 clips[n].c.top = 0; 103 clips[n].c.width = win->width - clips[n].c.left; 104 clips[n].c.height = win->height; 105 n++; 106 } 107 if (win->top < 0) { 108 /* top */ 109 clips[n].c.left = 0; 110 clips[n].c.top = 0; 111 clips[n].c.width = win->width; 112 clips[n].c.height = -win->top; 113 n++; 114 } 115 if (win->top + win->height > sheight) { 116 /* bottom */ 117 clips[n].c.left = 0; 118 clips[n].c.top = sheight - win->top; 119 clips[n].c.width = win->width; 120 clips[n].c.height = win->height - clips[n].c.top; 121 n++; 122 } 123 return n; 124 } 125 126 int 127 btcx_align(struct v4l2_rect *win, struct v4l2_clip *clips, unsigned int n, int mask) 128 { 129 s32 nx,nw,dx; 130 unsigned int i; 131 132 /* fixup window */ 133 nx = (win->left + mask) & ~mask; 134 nw = (win->width) & ~mask; 135 if (nx + nw > win->left + win->width) 136 nw -= mask+1; 137 dx = nx - win->left; 138 win->left = nx; 139 win->width = nw; 140 if (btcx_debug) 141 printk(KERN_DEBUG "btcx: window align %dx%d+%d+%d [dx=%d]\n", 142 win->width, win->height, win->left, win->top, dx); 143 144 /* fixup clips */ 145 for (i = 0; i < n; i++) { 146 nx = (clips[i].c.left-dx) & ~mask; 147 nw = (clips[i].c.width) & ~mask; 148 if (nx + nw < clips[i].c.left-dx + clips[i].c.width) 149 nw += mask+1; 150 clips[i].c.left = nx; 151 clips[i].c.width = nw; 152 if (btcx_debug) 153 printk(KERN_DEBUG "btcx: clip align %dx%d+%d+%d\n", 154 clips[i].c.width, clips[i].c.height, 155 clips[i].c.left, clips[i].c.top); 156 } 157 return 0; 158 } 159 160 void 161 btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips) 162 { 163 struct v4l2_clip swap; 164 int i,j,n; 165 166 if (nclips < 2) 167 return; 168 for (i = nclips-2; i >= 0; i--) { 169 for (n = 0, j = 0; j <= i; j++) { 170 if (clips[j].c.left > clips[j+1].c.left) { 171 swap = clips[j]; 172 clips[j] = clips[j+1]; 173 clips[j+1] = swap; 174 n++; 175 } 176 } 177 if (0 == n) 178 break; 179 } 180 } 181 182 void 183 btcx_calc_skips(int line, int width, int *maxy, 184 struct btcx_skiplist *skips, unsigned int *nskips, 185 const struct v4l2_clip *clips, unsigned int nclips) 186 { 187 unsigned int clip,skip; 188 int end, maxline; 189 190 skip=0; 191 maxline = 9999; 192 for (clip = 0; clip < nclips; clip++) { 193 194 /* sanity checks */ 195 if (clips[clip].c.left + clips[clip].c.width <= 0) 196 continue; 197 if (clips[clip].c.left > (signed)width) 198 break; 199 200 /* vertical range */ 201 if (line > clips[clip].c.top+clips[clip].c.height-1) 202 continue; 203 if (line < clips[clip].c.top) { 204 if (maxline > clips[clip].c.top-1) 205 maxline = clips[clip].c.top-1; 206 continue; 207 } 208 if (maxline > clips[clip].c.top+clips[clip].c.height-1) 209 maxline = clips[clip].c.top+clips[clip].c.height-1; 210 211 /* horizontal range */ 212 if (0 == skip || clips[clip].c.left > skips[skip-1].end) { 213 /* new one */ 214 skips[skip].start = clips[clip].c.left; 215 if (skips[skip].start < 0) 216 skips[skip].start = 0; 217 skips[skip].end = clips[clip].c.left + clips[clip].c.width; 218 if (skips[skip].end > width) 219 skips[skip].end = width; 220 skip++; 221 } else { 222 /* overlaps -- expand last one */ 223 end = clips[clip].c.left + clips[clip].c.width; 224 if (skips[skip-1].end < end) 225 skips[skip-1].end = end; 226 if (skips[skip-1].end > width) 227 skips[skip-1].end = width; 228 } 229 } 230 *nskips = skip; 231 *maxy = maxline; 232 233 if (btcx_debug) { 234 printk(KERN_DEBUG "btcx: skips line %d-%d:",line,maxline); 235 for (skip = 0; skip < *nskips; skip++) { 236 printk(" %d-%d",skips[skip].start,skips[skip].end); 237 } 238 printk("\n"); 239 } 240 } 241