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 <video/omapdss.h> 30 31#include "omap_voutlib.h" 32 33MODULE_AUTHOR("Texas Instruments"); 34MODULE_DESCRIPTION("OMAP Video library"); 35MODULE_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 */ 43void 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} 55EXPORT_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 */ 63int 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} 101EXPORT_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 */ 111int 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 (omap_vout_dss_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 (omap_vout_dss_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} 153EXPORT_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 */ 165int 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 (omap_vout_dss_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 (omap_vout_dss_omap24xx() && (vresize > 2048)) 211 vresize = 2048; 212 else if (omap_vout_dss_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 (omap_vout_dss_omap24xx() && (hresize > 2048)) 230 hresize = 2048; 231 else if (omap_vout_dss_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 (omap_vout_dss_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 (omap_vout_dss_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} 272EXPORT_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 */ 281void 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} 296EXPORT_SYMBOL_GPL(omap_vout_new_format); 297 298/* 299 * Allocate buffers 300 */ 301unsigned 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 */ 325void 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} 340 341bool omap_vout_dss_omap24xx(void) 342{ 343 return omapdss_get_version() == OMAPDSS_VER_OMAP24xx; 344} 345 346bool omap_vout_dss_omap34xx(void) 347{ 348 switch (omapdss_get_version()) { 349 case OMAPDSS_VER_OMAP34xx_ES1: 350 case OMAPDSS_VER_OMAP34xx_ES3: 351 case OMAPDSS_VER_OMAP3630: 352 case OMAPDSS_VER_AM35xx: 353 return true; 354 default: 355 return false; 356 } 357} 358