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  */
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_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  * the 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  */
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  */
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  */
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  */
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  */
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 
345 bool omap_vout_dss_omap24xx(void)
346 {
347 	return omapdss_get_version() == OMAPDSS_VER_OMAP24xx;
348 }
349 
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