drivers/media/pci/bt8xx/btcx-risc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3
   4     btcx-risc.c
   5
   6     bt848/bt878/cx2388x risc code generator.
   7
   8     (c) 2000-03 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   9
  10
  11 */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/pci.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/videodev2.h>
  20 #include <linux/pgtable.h>
  21 #include <asm/page.h>
  22
  23 #include "btcx-risc.h"
  24
  25 static unsigned int btcx_debug;
  26 module_param(btcx_debug, int, 0644);
  27 MODULE_PARM_DESC(btcx_debug,"debug messages, default is 0 (no)");
  28
  29 #define dprintk(fmt, arg...) do {                               \
  30         if (btcx_debug)                                         \
  31                 printk(KERN_DEBUG pr_fmt("%s: " fmt),           \
  32                        __func__, ##arg);                        \
  33 } while (0)
  34
  35
  36 /* ---------------------------------------------------------- */
  37 /* allocate/free risc memory                                  */
  38
  39 static int memcnt;
  40
  41 void btcx_riscmem_free(struct pci_dev *pci,
  42                        struct btcx_riscmem *risc)
  43 {
  44         if (NULL == risc->cpu)
  45                 return;
  46
  47         memcnt--;
  48         dprintk("btcx: riscmem free [%d] dma=%lx\n",
  49                 memcnt, (unsigned long)risc->dma);
  50
  51         dma_free_coherent(&pci->dev, risc->size, risc->cpu, risc->dma);
  52         memset(risc,0,sizeof(*risc));
  53 }
  54
  55 int btcx_riscmem_alloc(struct pci_dev *pci,
  56                        struct btcx_riscmem *risc,
  57                        unsigned int size)
  58 {
  59         __le32 *cpu;
  60         dma_addr_t dma = 0;
  61
  62         if (NULL != risc->cpu && risc->size < size)
  63                 btcx_riscmem_free(pci,risc);
  64         if (NULL == risc->cpu) {
  65                 cpu = dma_alloc_coherent(&pci->dev, size, &dma, GFP_KERNEL);
  66                 if (NULL == cpu)
  67                         return -ENOMEM;
  68                 risc->cpu  = cpu;
  69                 risc->dma  = dma;
  70                 risc->size = size;
  71
  72                 memcnt++;
  73                 dprintk("btcx: riscmem alloc [%d] dma=%lx cpu=%p size=%d\n",
  74                         memcnt, (unsigned long)dma, cpu, size);
  75         }
  76         return 0;
  77 }
  78
  79 /* ---------------------------------------------------------- */
  80 /* screen overlay helpers                                     */
  81
  82 int
  83 btcx_screen_clips(int swidth, int sheight, struct v4l2_rect *win,
  84                   struct v4l2_clip *clips, unsigned int n)
  85 {
  86         if (win->left < 0) {
  87                 /* left */
  88                 clips[n].c.left = 0;
  89                 clips[n].c.top = 0;
  90                 clips[n].c.width  = -win->left;
  91                 clips[n].c.height = win->height;
  92                 n++;
  93         }
  94         if (win->left + win->width > swidth) {
  95                 /* right */
  96                 clips[n].c.left   = swidth - win->left;
  97                 clips[n].c.top    = 0;
  98                 clips[n].c.width  = win->width - clips[n].c.left;
  99                 clips[n].c.height = win->height;
 100                 n++;
 101         }
 102         if (win->top < 0) {
 103                 /* top */
 104                 clips[n].c.left = 0;
 105                 clips[n].c.top = 0;
 106                 clips[n].c.width  = win->width;
 107                 clips[n].c.height = -win->top;
 108                 n++;
 109         }
 110         if (win->top + win->height > sheight) {
 111                 /* bottom */
 112                 clips[n].c.left = 0;
 113                 clips[n].c.top = sheight - win->top;
 114                 clips[n].c.width  = win->width;
 115                 clips[n].c.height = win->height - clips[n].c.top;
 116                 n++;
 117         }
 118         return n;
 119 }
 120
 121 int
 122 btcx_align(struct v4l2_rect *win, struct v4l2_clip *clips, unsigned int n, int mask)
 123 {
 124         s32 nx,nw,dx;
 125         unsigned int i;
 126
 127         /* fixup window */
 128         nx = (win->left + mask) & ~mask;
 129         nw = (win->width) & ~mask;
 130         if (nx + nw > win->left + win->width)
 131                 nw -= mask+1;
 132         dx = nx - win->left;
 133         win->left  = nx;
 134         win->width = nw;
 135         dprintk("btcx: window align %dx%d+%d+%d [dx=%d]\n",
 136                win->width, win->height, win->left, win->top, dx);
 137
 138         /* fixup clips */
 139         for (i = 0; i < n; i++) {
 140                 nx = (clips[i].c.left-dx) & ~mask;
 141                 nw = (clips[i].c.width) & ~mask;
 142                 if (nx + nw < clips[i].c.left-dx + clips[i].c.width)
 143                         nw += mask+1;
 144                 clips[i].c.left  = nx;
 145                 clips[i].c.width = nw;
 146                 dprintk("btcx:   clip align %dx%d+%d+%d\n",
 147                        clips[i].c.width, clips[i].c.height,
 148                        clips[i].c.left, clips[i].c.top);
 149         }
 150         return 0;
 151 }
 152
 153 void
 154 btcx_sort_clips(struct v4l2_clip *clips, unsigned int nclips)
 155 {
 156         int i,j,n;
 157
 158         if (nclips < 2)
 159                 return;
 160         for (i = nclips-2; i >= 0; i--) {
 161                 for (n = 0, j = 0; j <= i; j++) {
 162                         if (clips[j].c.left > clips[j+1].c.left) {
 163                                 swap(clips[j], clips[j + 1]);
 164                                 n++;
 165                         }
 166                 }
 167                 if (0 == n)
 168                         break;
 169         }
 170 }
 171
 172 void
 173 btcx_calc_skips(int line, int width, int *maxy,
 174                 struct btcx_skiplist *skips, unsigned int *nskips,
 175                 const struct v4l2_clip *clips, unsigned int nclips)
 176 {
 177         unsigned int clip,skip;
 178         int end, maxline;
 179
 180         skip=0;
 181         maxline = 9999;
 182         for (clip = 0; clip < nclips; clip++) {
 183
 184                 /* sanity checks */
 185                 if (clips[clip].c.left + clips[clip].c.width <= 0)
 186                         continue;
 187                 if (clips[clip].c.left > (signed)width)
 188                         break;
 189
 190                 /* vertical range */
 191                 if (line > clips[clip].c.top+clips[clip].c.height-1)
 192                         continue;
 193                 if (line < clips[clip].c.top) {
 194                         if (maxline > clips[clip].c.top-1)
 195                                 maxline = clips[clip].c.top-1;
 196                         continue;
 197                 }
 198                 if (maxline > clips[clip].c.top+clips[clip].c.height-1)
 199                         maxline = clips[clip].c.top+clips[clip].c.height-1;
 200
 201                 /* horizontal range */
 202                 if (0 == skip || clips[clip].c.left > skips[skip-1].end) {
 203                         /* new one */
 204                         skips[skip].start = clips[clip].c.left;
 205                         if (skips[skip].start < 0)
 206                                 skips[skip].start = 0;
 207                         skips[skip].end = clips[clip].c.left + clips[clip].c.width;
 208                         if (skips[skip].end > width)
 209                                 skips[skip].end = width;
 210                         skip++;
 211                 } else {
 212                         /* overlaps -- expand last one */
 213                         end = clips[clip].c.left + clips[clip].c.width;
 214                         if (skips[skip-1].end < end)
 215                                 skips[skip-1].end = end;
 216                         if (skips[skip-1].end > width)
 217                                 skips[skip-1].end = width;
 218                 }
 219         }
 220         *nskips = skip;
 221         *maxy = maxline;
 222
 223         if (btcx_debug) {
 224                 dprintk("btcx: skips line %d-%d:", line, maxline);
 225                 for (skip = 0; skip < *nskips; skip++) {
 226                         pr_cont(" %d-%d", skips[skip].start, skips[skip].end);
 227                 }
 228                 pr_cont("\n");
 229         }
 230 }