drivers/media/video/omap/omap_voutlib.c

   1 /*
   2  * omap_voutlib.c
   3  *
   4  * Copyright (C) 2005-2010 Texas Instruments.
   5  *
   6  * This file is licensed under the terms of the GNU General Public License
   7  * version 2. This program is licensed "as is" without any warranty of any
   8  * kind, whether express or implied.
   9  *
  10  * Based on the OMAP2 camera driver
  11  * Video-for-Linux (Version 2) camera capture driver for
  12  * the OMAP24xx camera controller.
  13  *
  14  * Author: Andy Lowe (source@mvista.com)
  15  *
  16  * Copyright (C) 2004 MontaVista Software, Inc.
  17  * Copyright (C) 2010 Texas Instruments.
  18  *
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/errno.h>
  23 #include <linux/kernel.h>
  24 #include <linux/types.h>
  25 #include <linux/videodev2.h>
  26
  27 #include <linux/dma-mapping.h>
  28
  29 #include <plat/cpu.h>
  30
  31 #include "omap_voutlib.h"
  32
  33 MODULE_AUTHOR("Texas Instruments");
  34 MODULE_DESCRIPTION("OMAP Video library");
  35 MODULE_LICENSE("GPL");
  36
  37 /* Return the default overlay cropping rectangle in crop given the image
  38  * size in pix and the video display size in fbuf.  The default
  39  * cropping rectangle is the largest rectangle no larger than the capture size
  40  * that will fit on the display.  The default cropping rectangle is centered in
  41  * the image.  All dimensions and offsets are rounded down to even numbers.
  42  */
  43 void omap_vout_default_crop(struct v4l2_pix_format *pix,
  44                   struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop)
  45 {
  46         crop->width = (pix->width < fbuf->fmt.width) ?
  47                 pix->width : fbuf->fmt.width;
  48         crop->height = (pix->height < fbuf->fmt.height) ?
  49                 pix->height : fbuf->fmt.height;
  50         crop->width &= ~1;
  51         crop->height &= ~1;
  52         crop->left = ((pix->width - crop->width) >> 1) & ~1;
  53         crop->top = ((pix->height - crop->height) >> 1) & ~1;
  54 }
  55 EXPORT_SYMBOL_GPL(omap_vout_default_crop);
  56
  57 /* Given a new render window in new_win, adjust the window to the
  58  * nearest supported configuration.  The adjusted window parameters are
  59  * returned in new_win.
  60  * Returns zero if successful, or -EINVAL if the requested window is
  61  * impossible and cannot reasonably be adjusted.
  62  */
  63 int omap_vout_try_window(struct v4l2_framebuffer *fbuf,
  64                         struct v4l2_window *new_win)
  65 {
  66         struct v4l2_rect try_win;
  67
  68         /* make a working copy of the new_win rectangle */
  69         try_win = new_win->w;
  70
  71         /* adjust the preview window so it fits on the display by clipping any
  72          * offscreen areas
  73          */
  74         if (try_win.left < 0) {
  75                 try_win.width += try_win.left;
  76                 try_win.left = 0;
  77         }
  78         if (try_win.top < 0) {
  79                 try_win.height += try_win.top;
  80                 try_win.top = 0;
  81         }
  82         try_win.width = (try_win.width < fbuf->fmt.width) ?
  83                 try_win.width : fbuf->fmt.width;
  84         try_win.height = (try_win.height < fbuf->fmt.height) ?
  85                 try_win.height : fbuf->fmt.height;
  86         if (try_win.left + try_win.width > fbuf->fmt.width)
  87                 try_win.width = fbuf->fmt.width - try_win.left;
  88         if (try_win.top + try_win.height > fbuf->fmt.height)
  89                 try_win.height = fbuf->fmt.height - try_win.top;
  90         try_win.width &= ~1;
  91         try_win.height &= ~1;
  92
  93         if (try_win.width <= 0 || try_win.height <= 0)
  94                 return -EINVAL;
  95
  96         /* We now have a valid preview window, so go with it */
  97         new_win->w = try_win;
  98         new_win->field = V4L2_FIELD_ANY;
  99         return 0;
 100 }
 101 EXPORT_SYMBOL_GPL(omap_vout_try_window);
 102
 103 /* Given a new render window in new_win, adjust the window to the
 104  * nearest supported configuration.  The image cropping window in crop
 105  * will also be adjusted if necessary.  Preference is given to keeping the
 106  * the window as close to the requested configuration as possible.  If
 107  * successful, new_win, vout->win, and crop are updated.
 108  * Returns zero if successful, or -EINVAL if the requested preview window is
 109  * impossible and cannot reasonably be adjusted.
 110  */
 111 int omap_vout_new_window(struct v4l2_rect *crop,
 112                 struct v4l2_window *win, struct v4l2_framebuffer *fbuf,
 113                 struct v4l2_window *new_win)
 114 {
 115         int err;
 116
 117         err = omap_vout_try_window(fbuf, new_win);
 118         if (err)
 119                 return err;
 120
 121         /* update our preview window */
 122         win->w = new_win->w;
 123         win->field = new_win->field;
 124         win->chromakey = new_win->chromakey;
 125
 126         /* Adjust the cropping window to allow for resizing limitation */
 127         if (cpu_is_omap24xx()) {
 128                 /* For 24xx limit is 8x to 1/2x scaling. */
 129                 if ((crop->height/win->w.height) >= 2)
 130                         crop->height = win->w.height * 2;
 131
 132                 if ((crop->width/win->w.width) >= 2)
 133                         crop->width = win->w.width * 2;
 134
 135                 if (crop->width > 768) {
 136                         /* The OMAP2420 vertical resizing line buffer is 768
 137                          * pixels wide. If the cropped image is wider than
 138                          * 768 pixels then it cannot be vertically resized.
 139                          */
 140                         if (crop->height != win->w.height)
 141                                 crop->width = 768;
 142                 }
 143         } else if (cpu_is_omap34xx()) {
 144                 /* For 34xx limit is 8x to 1/4x scaling. */
 145                 if ((crop->height/win->w.height) >= 4)
 146                         crop->height = win->w.height * 4;
 147
 148                 if ((crop->width/win->w.width) >= 4)
 149                         crop->width = win->w.width * 4;
 150         }
 151         return 0;
 152 }
 153 EXPORT_SYMBOL_GPL(omap_vout_new_window);
 154
 155 /* Given a new cropping rectangle in new_crop, adjust the cropping rectangle to
 156  * the nearest supported configuration.  The image render window in win will
 157  * also be adjusted if necessary.  The preview window is adjusted such that the
 158  * horizontal and vertical rescaling ratios stay constant.  If the render
 159  * window would fall outside the display boundaries, the cropping rectangle
 160  * will also be adjusted to maintain the rescaling ratios.  If successful, crop
 161  * and win are updated.
 162  * Returns zero if successful, or -EINVAL if the requested cropping rectangle is
 163  * impossible and cannot reasonably be adjusted.
 164  */
 165 int omap_vout_new_crop(struct v4l2_pix_format *pix,
 166               struct v4l2_rect *crop, struct v4l2_window *win,
 167               struct v4l2_framebuffer *fbuf, const struct v4l2_rect *new_crop)
 168 {
 169         struct v4l2_rect try_crop;
 170         unsigned long vresize, hresize;
 171
 172         /* make a working copy of the new_crop rectangle */
 173         try_crop = *new_crop;
 174
 175         /* adjust the cropping rectangle so it fits in the image */
 176         if (try_crop.left < 0) {
 177                 try_crop.width += try_crop.left;
 178                 try_crop.left = 0;
 179         }
 180         if (try_crop.top < 0) {
 181                 try_crop.height += try_crop.top;
 182                 try_crop.top = 0;
 183         }
 184         try_crop.width = (try_crop.width < pix->width) ?
 185                 try_crop.width : pix->width;
 186         try_crop.height = (try_crop.height < pix->height) ?
 187                 try_crop.height : pix->height;
 188         if (try_crop.left + try_crop.width > pix->width)
 189                 try_crop.width = pix->width - try_crop.left;
 190         if (try_crop.top + try_crop.height > pix->height)
 191                 try_crop.height = pix->height - try_crop.top;
 192
 193         try_crop.width &= ~1;
 194         try_crop.height &= ~1;
 195
 196         if (try_crop.width <= 0 || try_crop.height <= 0)
 197                 return -EINVAL;
 198
 199         if (cpu_is_omap24xx()) {
 200                 if (try_crop.height != win->w.height) {
 201                         /* If we're resizing vertically, we can't support a
 202                          * crop width wider than 768 pixels.
 203                          */
 204                         if (try_crop.width > 768)
 205                                 try_crop.width = 768;
 206                 }
 207         }
 208         /* vertical resizing */
 209         vresize = (1024 * try_crop.height) / win->w.height;
 210         if (cpu_is_omap24xx() && (vresize > 2048))
 211                 vresize = 2048;
 212         else if (cpu_is_omap34xx() && (vresize > 4096))
 213                 vresize = 4096;
 214
 215         win->w.height = ((1024 * try_crop.height) / vresize) & ~1;
 216         if (win->w.height == 0)
 217                 win->w.height = 2;
 218         if (win->w.height + win->w.top > fbuf->fmt.height) {
 219                 /* We made the preview window extend below the bottom of the
 220                  * display, so clip it to the display boundary and resize the
 221                  * cropping height to maintain the vertical resizing ratio.
 222                  */
 223                 win->w.height = (fbuf->fmt.height - win->w.top) & ~1;
 224                 if (try_crop.height == 0)
 225                         try_crop.height = 2;
 226         }
 227         /* horizontal resizing */
 228         hresize = (1024 * try_crop.width) / win->w.width;
 229         if (cpu_is_omap24xx() && (hresize > 2048))
 230                 hresize = 2048;
 231         else if (cpu_is_omap34xx() && (hresize > 4096))
 232                 hresize = 4096;
 233
 234         win->w.width = ((1024 * try_crop.width) / hresize) & ~1;
 235         if (win->w.width == 0)
 236                 win->w.width = 2;
 237         if (win->w.width + win->w.left > fbuf->fmt.width) {
 238                 /* We made the preview window extend past the right side of the
 239                  * display, so clip it to the display boundary and resize the
 240                  * cropping width to maintain the horizontal resizing ratio.
 241                  */
 242                 win->w.width = (fbuf->fmt.width - win->w.left) & ~1;
 243                 if (try_crop.width == 0)
 244                         try_crop.width = 2;
 245         }
 246         if (cpu_is_omap24xx()) {
 247                 if ((try_crop.height/win->w.height) >= 2)
 248                         try_crop.height = win->w.height * 2;
 249
 250                 if ((try_crop.width/win->w.width) >= 2)
 251                         try_crop.width = win->w.width * 2;
 252
 253                 if (try_crop.width > 768) {
 254                         /* The OMAP2420 vertical resizing line buffer is
 255                          * 768 pixels wide.  If the cropped image is wider
 256                          * than 768 pixels then it cannot be vertically resized.
 257                          */
 258                         if (try_crop.height != win->w.height)
 259                                 try_crop.width = 768;
 260                 }
 261         } else if (cpu_is_omap34xx()) {
 262                 if ((try_crop.height/win->w.height) >= 4)
 263                         try_crop.height = win->w.height * 4;
 264
 265                 if ((try_crop.width/win->w.width) >= 4)
 266                         try_crop.width = win->w.width * 4;
 267         }
 268         /* update our cropping rectangle and we're done */
 269         *crop = try_crop;
 270         return 0;
 271 }
 272 EXPORT_SYMBOL_GPL(omap_vout_new_crop);
 273
 274 /* Given a new format in pix and fbuf,  crop and win
 275  * structures are initialized to default values. crop
 276  * is initialized to the largest window size that will fit on the display.  The
 277  * crop window is centered in the image. win is initialized to
 278  * the same size as crop and is centered on the display.
 279  * All sizes and offsets are constrained to be even numbers.
 280  */
 281 void omap_vout_new_format(struct v4l2_pix_format *pix,
 282                 struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop,
 283                 struct v4l2_window *win)
 284 {
 285         /* crop defines the preview source window in the image capture
 286          * buffer
 287          */
 288         omap_vout_default_crop(pix, fbuf, crop);
 289
 290         /* win defines the preview target window on the display */
 291         win->w.width = crop->width;
 292         win->w.height = crop->height;
 293         win->w.left = ((fbuf->fmt.width - win->w.width) >> 1) & ~1;
 294         win->w.top = ((fbuf->fmt.height - win->w.height) >> 1) & ~1;
 295 }
 296 EXPORT_SYMBOL_GPL(omap_vout_new_format);
 297
 298 /*
 299  * Allocate buffers
 300  */
 301 unsigned long omap_vout_alloc_buffer(u32 buf_size, u32 *phys_addr)
 302 {
 303         u32 order, size;
 304         unsigned long virt_addr, addr;
 305
 306         size = PAGE_ALIGN(buf_size);
 307         order = get_order(size);
 308         virt_addr = __get_free_pages(GFP_KERNEL, order);
 309         addr = virt_addr;
 310
 311         if (virt_addr) {
 312                 while (size > 0) {
 313                         SetPageReserved(virt_to_page(addr));
 314                         addr += PAGE_SIZE;
 315                         size -= PAGE_SIZE;
 316                 }
 317         }
 318         *phys_addr = (u32) virt_to_phys((void *) virt_addr);
 319         return virt_addr;
 320 }
 321
 322 /*
 323  * Free buffers
 324  */
 325 void omap_vout_free_buffer(unsigned long virtaddr, u32 buf_size)
 326 {
 327         u32 order, size;
 328         unsigned long addr = virtaddr;
 329
 330         size = PAGE_ALIGN(buf_size);
 331         order = get_order(size);
 332
 333         while (size > 0) {
 334                 ClearPageReserved(virt_to_page(addr));
 335                 addr += PAGE_SIZE;
 336                 size -= PAGE_SIZE;
 337         }
 338         free_pages((unsigned long) virtaddr, order);
 339 }