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/omapfb_dss.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 */
omap_vout_default_crop(struct v4l2_pix_format * pix,struct v4l2_framebuffer * fbuf,struct v4l2_rect * crop)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 */
omap_vout_try_window(struct v4l2_framebuffer * fbuf,struct v4l2_window * new_win)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_NONE;
99 new_win->clips = NULL;
100 new_win->clipcount = 0;
101 new_win->bitmap = NULL;
102
103 return 0;
104 }
105 EXPORT_SYMBOL_GPL(omap_vout_try_window);
106
107 /* Given a new render window in new_win, adjust the window to the
108 * nearest supported configuration. The image cropping window in crop
109 * will also be adjusted if necessary. Preference is given to keeping the
110 * window as close to the requested configuration as possible. If
111 * successful, new_win, vout->win, and crop are updated.
112 * Returns zero if successful, or -EINVAL if the requested preview window is
113 * impossible and cannot reasonably be adjusted.
114 */
omap_vout_new_window(struct v4l2_rect * crop,struct v4l2_window * win,struct v4l2_framebuffer * fbuf,struct v4l2_window * new_win)115 int omap_vout_new_window(struct v4l2_rect *crop,
116 struct v4l2_window *win, struct v4l2_framebuffer *fbuf,
117 struct v4l2_window *new_win)
118 {
119 int err;
120
121 err = omap_vout_try_window(fbuf, new_win);
122 if (err)
123 return err;
124
125 /* update our preview window */
126 win->w = new_win->w;
127 win->field = new_win->field;
128 win->chromakey = new_win->chromakey;
129
130 /* Adjust the cropping window to allow for resizing limitation */
131 if (omap_vout_dss_omap24xx()) {
132 /* For 24xx limit is 8x to 1/2x scaling. */
133 if ((crop->height/win->w.height) >= 2)
134 crop->height = win->w.height * 2;
135
136 if ((crop->width/win->w.width) >= 2)
137 crop->width = win->w.width * 2;
138
139 if (crop->width > 768) {
140 /* The OMAP2420 vertical resizing line buffer is 768
141 * pixels wide. If the cropped image is wider than
142 * 768 pixels then it cannot be vertically resized.
143 */
144 if (crop->height != win->w.height)
145 crop->width = 768;
146 }
147 } else if (omap_vout_dss_omap34xx()) {
148 /* For 34xx limit is 8x to 1/4x scaling. */
149 if ((crop->height/win->w.height) >= 4)
150 crop->height = win->w.height * 4;
151
152 if ((crop->width/win->w.width) >= 4)
153 crop->width = win->w.width * 4;
154 }
155 return 0;
156 }
157 EXPORT_SYMBOL_GPL(omap_vout_new_window);
158
159 /* Given a new cropping rectangle in new_crop, adjust the cropping rectangle to
160 * the nearest supported configuration. The image render window in win will
161 * also be adjusted if necessary. The preview window is adjusted such that the
162 * horizontal and vertical rescaling ratios stay constant. If the render
163 * window would fall outside the display boundaries, the cropping rectangle
164 * will also be adjusted to maintain the rescaling ratios. If successful, crop
165 * and win are updated.
166 * Returns zero if successful, or -EINVAL if the requested cropping rectangle is
167 * impossible and cannot reasonably be adjusted.
168 */
omap_vout_new_crop(struct v4l2_pix_format * pix,struct v4l2_rect * crop,struct v4l2_window * win,struct v4l2_framebuffer * fbuf,const struct v4l2_rect * new_crop)169 int omap_vout_new_crop(struct v4l2_pix_format *pix,
170 struct v4l2_rect *crop, struct v4l2_window *win,
171 struct v4l2_framebuffer *fbuf, const struct v4l2_rect *new_crop)
172 {
173 struct v4l2_rect try_crop;
174 unsigned long vresize, hresize;
175
176 /* make a working copy of the new_crop rectangle */
177 try_crop = *new_crop;
178
179 /* adjust the cropping rectangle so it fits in the image */
180 if (try_crop.left < 0) {
181 try_crop.width += try_crop.left;
182 try_crop.left = 0;
183 }
184 if (try_crop.top < 0) {
185 try_crop.height += try_crop.top;
186 try_crop.top = 0;
187 }
188 try_crop.width = (try_crop.width < pix->width) ?
189 try_crop.width : pix->width;
190 try_crop.height = (try_crop.height < pix->height) ?
191 try_crop.height : pix->height;
192 if (try_crop.left + try_crop.width > pix->width)
193 try_crop.width = pix->width - try_crop.left;
194 if (try_crop.top + try_crop.height > pix->height)
195 try_crop.height = pix->height - try_crop.top;
196
197 try_crop.width &= ~1;
198 try_crop.height &= ~1;
199
200 if (try_crop.width <= 0 || try_crop.height <= 0)
201 return -EINVAL;
202
203 if (omap_vout_dss_omap24xx()) {
204 if (try_crop.height != win->w.height) {
205 /* If we're resizing vertically, we can't support a
206 * crop width wider than 768 pixels.
207 */
208 if (try_crop.width > 768)
209 try_crop.width = 768;
210 }
211 }
212 /* vertical resizing */
213 vresize = (1024 * try_crop.height) / win->w.height;
214 if (omap_vout_dss_omap24xx() && (vresize > 2048))
215 vresize = 2048;
216 else if (omap_vout_dss_omap34xx() && (vresize > 4096))
217 vresize = 4096;
218
219 win->w.height = ((1024 * try_crop.height) / vresize) & ~1;
220 if (win->w.height == 0)
221 win->w.height = 2;
222 if (win->w.height + win->w.top > fbuf->fmt.height) {
223 /* We made the preview window extend below the bottom of the
224 * display, so clip it to the display boundary and resize the
225 * cropping height to maintain the vertical resizing ratio.
226 */
227 win->w.height = (fbuf->fmt.height - win->w.top) & ~1;
228 if (try_crop.height == 0)
229 try_crop.height = 2;
230 }
231 /* horizontal resizing */
232 hresize = (1024 * try_crop.width) / win->w.width;
233 if (omap_vout_dss_omap24xx() && (hresize > 2048))
234 hresize = 2048;
235 else if (omap_vout_dss_omap34xx() && (hresize > 4096))
236 hresize = 4096;
237
238 win->w.width = ((1024 * try_crop.width) / hresize) & ~1;
239 if (win->w.width == 0)
240 win->w.width = 2;
241 if (win->w.width + win->w.left > fbuf->fmt.width) {
242 /* We made the preview window extend past the right side of the
243 * display, so clip it to the display boundary and resize the
244 * cropping width to maintain the horizontal resizing ratio.
245 */
246 win->w.width = (fbuf->fmt.width - win->w.left) & ~1;
247 if (try_crop.width == 0)
248 try_crop.width = 2;
249 }
250 if (omap_vout_dss_omap24xx()) {
251 if ((try_crop.height/win->w.height) >= 2)
252 try_crop.height = win->w.height * 2;
253
254 if ((try_crop.width/win->w.width) >= 2)
255 try_crop.width = win->w.width * 2;
256
257 if (try_crop.width > 768) {
258 /* The OMAP2420 vertical resizing line buffer is
259 * 768 pixels wide. If the cropped image is wider
260 * than 768 pixels then it cannot be vertically resized.
261 */
262 if (try_crop.height != win->w.height)
263 try_crop.width = 768;
264 }
265 } else if (omap_vout_dss_omap34xx()) {
266 if ((try_crop.height/win->w.height) >= 4)
267 try_crop.height = win->w.height * 4;
268
269 if ((try_crop.width/win->w.width) >= 4)
270 try_crop.width = win->w.width * 4;
271 }
272 /* update our cropping rectangle and we're done */
273 *crop = try_crop;
274 return 0;
275 }
276 EXPORT_SYMBOL_GPL(omap_vout_new_crop);
277
278 /* Given a new format in pix and fbuf, crop and win
279 * structures are initialized to default values. crop
280 * is initialized to the largest window size that will fit on the display. The
281 * crop window is centered in the image. win is initialized to
282 * the same size as crop and is centered on the display.
283 * All sizes and offsets are constrained to be even numbers.
284 */
omap_vout_new_format(struct v4l2_pix_format * pix,struct v4l2_framebuffer * fbuf,struct v4l2_rect * crop,struct v4l2_window * win)285 void omap_vout_new_format(struct v4l2_pix_format *pix,
286 struct v4l2_framebuffer *fbuf, struct v4l2_rect *crop,
287 struct v4l2_window *win)
288 {
289 /* crop defines the preview source window in the image capture
290 * buffer
291 */
292 omap_vout_default_crop(pix, fbuf, crop);
293
294 /* win defines the preview target window on the display */
295 win->w.width = crop->width;
296 win->w.height = crop->height;
297 win->w.left = ((fbuf->fmt.width - win->w.width) >> 1) & ~1;
298 win->w.top = ((fbuf->fmt.height - win->w.height) >> 1) & ~1;
299 }
300 EXPORT_SYMBOL_GPL(omap_vout_new_format);
301
302 /*
303 * Allocate buffers
304 */
omap_vout_alloc_buffer(u32 buf_size,u32 * phys_addr)305 unsigned long omap_vout_alloc_buffer(u32 buf_size, u32 *phys_addr)
306 {
307 u32 order, size;
308 unsigned long virt_addr, addr;
309
310 size = PAGE_ALIGN(buf_size);
311 order = get_order(size);
312 virt_addr = __get_free_pages(GFP_KERNEL, order);
313 addr = virt_addr;
314
315 if (virt_addr) {
316 while (size > 0) {
317 SetPageReserved(virt_to_page((void *)addr));
318 addr += PAGE_SIZE;
319 size -= PAGE_SIZE;
320 }
321 }
322 *phys_addr = (u32) virt_to_phys((void *) virt_addr);
323 return virt_addr;
324 }
325
326 /*
327 * Free buffers
328 */
omap_vout_free_buffer(unsigned long virtaddr,u32 buf_size)329 void omap_vout_free_buffer(unsigned long virtaddr, u32 buf_size)
330 {
331 u32 order, size;
332 unsigned long addr = virtaddr;
333
334 size = PAGE_ALIGN(buf_size);
335 order = get_order(size);
336
337 while (size > 0) {
338 ClearPageReserved(virt_to_page((void *)addr));
339 addr += PAGE_SIZE;
340 size -= PAGE_SIZE;
341 }
342 free_pages((unsigned long) virtaddr, order);
343 }
344
omap_vout_dss_omap24xx(void)345 bool omap_vout_dss_omap24xx(void)
346 {
347 return omapdss_get_version() == OMAPDSS_VER_OMAP24xx;
348 }
349
omap_vout_dss_omap34xx(void)350 bool omap_vout_dss_omap34xx(void)
351 {
352 switch (omapdss_get_version()) {
353 case OMAPDSS_VER_OMAP34xx_ES1:
354 case OMAPDSS_VER_OMAP34xx_ES3:
355 case OMAPDSS_VER_OMAP3630:
356 case OMAPDSS_VER_AM35xx:
357 return true;
358 default:
359 return false;
360 }
361 }
362