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1 /*
2  * omap_vout_vrfb.c
3  *
4  * Copyright (C) 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  */
11 
12 #include <linux/sched.h>
13 #include <linux/platform_device.h>
14 #include <linux/videodev2.h>
15 
16 #include <media/videobuf-dma-contig.h>
17 #include <media/v4l2-device.h>
18 
19 #include <linux/omap-dma.h>
20 #include <video/omapvrfb.h>
21 
22 #include "omap_voutdef.h"
23 #include "omap_voutlib.h"
24 
25 #define OMAP_DMA_NO_DEVICE	0
26 
27 /*
28  * Function for allocating video buffers
29  */
omap_vout_allocate_vrfb_buffers(struct omap_vout_device * vout,unsigned int * count,int startindex)30 static int omap_vout_allocate_vrfb_buffers(struct omap_vout_device *vout,
31 		unsigned int *count, int startindex)
32 {
33 	int i, j;
34 
35 	for (i = 0; i < *count; i++) {
36 		if (!vout->smsshado_virt_addr[i]) {
37 			vout->smsshado_virt_addr[i] =
38 				omap_vout_alloc_buffer(vout->smsshado_size,
39 						&vout->smsshado_phy_addr[i]);
40 		}
41 		if (!vout->smsshado_virt_addr[i] && startindex != -1) {
42 			if (V4L2_MEMORY_MMAP == vout->memory && i >= startindex)
43 				break;
44 		}
45 		if (!vout->smsshado_virt_addr[i]) {
46 			for (j = 0; j < i; j++) {
47 				omap_vout_free_buffer(
48 						vout->smsshado_virt_addr[j],
49 						vout->smsshado_size);
50 				vout->smsshado_virt_addr[j] = 0;
51 				vout->smsshado_phy_addr[j] = 0;
52 			}
53 			*count = 0;
54 			return -ENOMEM;
55 		}
56 		memset((void *) vout->smsshado_virt_addr[i], 0,
57 				vout->smsshado_size);
58 	}
59 	return 0;
60 }
61 
62 /*
63  * Wakes up the application once the DMA transfer to VRFB space is completed.
64  */
omap_vout_vrfb_dma_tx_callback(int lch,u16 ch_status,void * data)65 static void omap_vout_vrfb_dma_tx_callback(int lch, u16 ch_status, void *data)
66 {
67 	struct vid_vrfb_dma *t = (struct vid_vrfb_dma *) data;
68 
69 	t->tx_status = 1;
70 	wake_up_interruptible(&t->wait);
71 }
72 
73 /*
74  * Free VRFB buffers
75  */
omap_vout_free_vrfb_buffers(struct omap_vout_device * vout)76 void omap_vout_free_vrfb_buffers(struct omap_vout_device *vout)
77 {
78 	int j;
79 
80 	for (j = 0; j < VRFB_NUM_BUFS; j++) {
81 		omap_vout_free_buffer(vout->smsshado_virt_addr[j],
82 				vout->smsshado_size);
83 		vout->smsshado_virt_addr[j] = 0;
84 		vout->smsshado_phy_addr[j] = 0;
85 	}
86 }
87 
omap_vout_setup_vrfb_bufs(struct platform_device * pdev,int vid_num,bool static_vrfb_allocation)88 int omap_vout_setup_vrfb_bufs(struct platform_device *pdev, int vid_num,
89 			      bool static_vrfb_allocation)
90 {
91 	int ret = 0, i, j;
92 	struct omap_vout_device *vout;
93 	struct video_device *vfd;
94 	int image_width, image_height;
95 	int vrfb_num_bufs = VRFB_NUM_BUFS;
96 	struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
97 	struct omap2video_device *vid_dev =
98 		container_of(v4l2_dev, struct omap2video_device, v4l2_dev);
99 
100 	vout = vid_dev->vouts[vid_num];
101 	vfd = vout->vfd;
102 
103 	for (i = 0; i < VRFB_NUM_BUFS; i++) {
104 		if (omap_vrfb_request_ctx(&vout->vrfb_context[i])) {
105 			dev_info(&pdev->dev, ": VRFB allocation failed\n");
106 			for (j = 0; j < i; j++)
107 				omap_vrfb_release_ctx(&vout->vrfb_context[j]);
108 			ret = -ENOMEM;
109 			goto free_buffers;
110 		}
111 	}
112 
113 	/* Calculate VRFB memory size */
114 	/* allocate for worst case size */
115 	image_width = VID_MAX_WIDTH / TILE_SIZE;
116 	if (VID_MAX_WIDTH % TILE_SIZE)
117 		image_width++;
118 
119 	image_width = image_width * TILE_SIZE;
120 	image_height = VID_MAX_HEIGHT / TILE_SIZE;
121 
122 	if (VID_MAX_HEIGHT % TILE_SIZE)
123 		image_height++;
124 
125 	image_height = image_height * TILE_SIZE;
126 	vout->smsshado_size = PAGE_ALIGN(image_width * image_height * 2 * 2);
127 
128 	/*
129 	 * Request and Initialize DMA, for DMA based VRFB transfer
130 	 */
131 	vout->vrfb_dma_tx.dev_id = OMAP_DMA_NO_DEVICE;
132 	vout->vrfb_dma_tx.dma_ch = -1;
133 	vout->vrfb_dma_tx.req_status = DMA_CHAN_ALLOTED;
134 	ret = omap_request_dma(vout->vrfb_dma_tx.dev_id, "VRFB DMA TX",
135 			omap_vout_vrfb_dma_tx_callback,
136 			(void *) &vout->vrfb_dma_tx, &vout->vrfb_dma_tx.dma_ch);
137 	if (ret < 0) {
138 		vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
139 		dev_info(&pdev->dev, ": failed to allocate DMA Channel for"
140 				" video%d\n", vfd->minor);
141 	}
142 	init_waitqueue_head(&vout->vrfb_dma_tx.wait);
143 
144 	/* statically allocated the VRFB buffer is done through
145 	   commands line aruments */
146 	if (static_vrfb_allocation) {
147 		if (omap_vout_allocate_vrfb_buffers(vout, &vrfb_num_bufs, -1)) {
148 			ret =  -ENOMEM;
149 			goto release_vrfb_ctx;
150 		}
151 		vout->vrfb_static_allocation = 1;
152 	}
153 	return 0;
154 
155 release_vrfb_ctx:
156 	for (j = 0; j < VRFB_NUM_BUFS; j++)
157 		omap_vrfb_release_ctx(&vout->vrfb_context[j]);
158 free_buffers:
159 	omap_vout_free_buffers(vout);
160 
161 	return ret;
162 }
163 
164 /*
165  * Release the VRFB context once the module exits
166  */
omap_vout_release_vrfb(struct omap_vout_device * vout)167 void omap_vout_release_vrfb(struct omap_vout_device *vout)
168 {
169 	int i;
170 
171 	for (i = 0; i < VRFB_NUM_BUFS; i++)
172 		omap_vrfb_release_ctx(&vout->vrfb_context[i]);
173 
174 	if (vout->vrfb_dma_tx.req_status == DMA_CHAN_ALLOTED) {
175 		vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
176 		omap_free_dma(vout->vrfb_dma_tx.dma_ch);
177 	}
178 }
179 
180 /*
181  * Allocate the buffers for the VRFB space.  Data is copied from V4L2
182  * buffers to the VRFB buffers using the DMA engine.
183  */
omap_vout_vrfb_buffer_setup(struct omap_vout_device * vout,unsigned int * count,unsigned int startindex)184 int omap_vout_vrfb_buffer_setup(struct omap_vout_device *vout,
185 			  unsigned int *count, unsigned int startindex)
186 {
187 	int i;
188 	bool yuv_mode;
189 
190 	if (!is_rotation_enabled(vout))
191 		return 0;
192 
193 	/* If rotation is enabled, allocate memory for VRFB space also */
194 	*count = *count > VRFB_NUM_BUFS ? VRFB_NUM_BUFS : *count;
195 
196 	/* Allocate the VRFB buffers only if the buffers are not
197 	 * allocated during init time.
198 	 */
199 	if (!vout->vrfb_static_allocation)
200 		if (omap_vout_allocate_vrfb_buffers(vout, count, startindex))
201 			return -ENOMEM;
202 
203 	if (vout->dss_mode == OMAP_DSS_COLOR_YUV2 ||
204 			vout->dss_mode == OMAP_DSS_COLOR_UYVY)
205 		yuv_mode = true;
206 	else
207 		yuv_mode = false;
208 
209 	for (i = 0; i < *count; i++)
210 		omap_vrfb_setup(&vout->vrfb_context[i],
211 				vout->smsshado_phy_addr[i], vout->pix.width,
212 				vout->pix.height, vout->bpp, yuv_mode);
213 
214 	return 0;
215 }
216 
omap_vout_prepare_vrfb(struct omap_vout_device * vout,struct videobuf_buffer * vb)217 int omap_vout_prepare_vrfb(struct omap_vout_device *vout,
218 				struct videobuf_buffer *vb)
219 {
220 	dma_addr_t dmabuf;
221 	struct vid_vrfb_dma *tx;
222 	enum dss_rotation rotation;
223 	u32 dest_frame_index = 0, src_element_index = 0;
224 	u32 dest_element_index = 0, src_frame_index = 0;
225 	u32 elem_count = 0, frame_count = 0, pixsize = 2;
226 
227 	if (!is_rotation_enabled(vout))
228 		return 0;
229 
230 	dmabuf = vout->buf_phy_addr[vb->i];
231 	/* If rotation is enabled, copy input buffer into VRFB
232 	 * memory space using DMA. We are copying input buffer
233 	 * into VRFB memory space of desired angle and DSS will
234 	 * read image VRFB memory for 0 degree angle
235 	 */
236 	pixsize = vout->bpp * vout->vrfb_bpp;
237 	/*
238 	 * DMA transfer in double index mode
239 	 */
240 
241 	/* Frame index */
242 	dest_frame_index = ((MAX_PIXELS_PER_LINE * pixsize) -
243 			(vout->pix.width * vout->bpp)) + 1;
244 
245 	/* Source and destination parameters */
246 	src_element_index = 0;
247 	src_frame_index = 0;
248 	dest_element_index = 1;
249 	/* Number of elements per frame */
250 	elem_count = vout->pix.width * vout->bpp;
251 	frame_count = vout->pix.height;
252 	tx = &vout->vrfb_dma_tx;
253 	tx->tx_status = 0;
254 	omap_set_dma_transfer_params(tx->dma_ch, OMAP_DMA_DATA_TYPE_S32,
255 			(elem_count / 4), frame_count, OMAP_DMA_SYNC_ELEMENT,
256 			tx->dev_id, 0x0);
257 	/* src_port required only for OMAP1 */
258 	omap_set_dma_src_params(tx->dma_ch, 0, OMAP_DMA_AMODE_POST_INC,
259 			dmabuf, src_element_index, src_frame_index);
260 	/*set dma source burst mode for VRFB */
261 	omap_set_dma_src_burst_mode(tx->dma_ch, OMAP_DMA_DATA_BURST_16);
262 	rotation = calc_rotation(vout);
263 
264 	/* dest_port required only for OMAP1 */
265 	omap_set_dma_dest_params(tx->dma_ch, 0, OMAP_DMA_AMODE_DOUBLE_IDX,
266 			vout->vrfb_context[vb->i].paddr[0], dest_element_index,
267 			dest_frame_index);
268 	/*set dma dest burst mode for VRFB */
269 	omap_set_dma_dest_burst_mode(tx->dma_ch, OMAP_DMA_DATA_BURST_16);
270 	omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE, 0x20, 0);
271 
272 	omap_start_dma(tx->dma_ch);
273 	interruptible_sleep_on_timeout(&tx->wait, VRFB_TX_TIMEOUT);
274 
275 	if (tx->tx_status == 0) {
276 		omap_stop_dma(tx->dma_ch);
277 		return -EINVAL;
278 	}
279 	/* Store buffers physical address into an array. Addresses
280 	 * from this array will be used to configure DSS */
281 	vout->queued_buf_addr[vb->i] = (u8 *)
282 		vout->vrfb_context[vb->i].paddr[rotation];
283 	return 0;
284 }
285 
286 /*
287  * Calculate the buffer offsets from which the streaming should
288  * start. This offset calculation is mainly required because of
289  * the VRFB 32 pixels alignment with rotation.
290  */
omap_vout_calculate_vrfb_offset(struct omap_vout_device * vout)291 void omap_vout_calculate_vrfb_offset(struct omap_vout_device *vout)
292 {
293 	enum dss_rotation rotation;
294 	bool mirroring = vout->mirror;
295 	struct v4l2_rect *crop = &vout->crop;
296 	struct v4l2_pix_format *pix = &vout->pix;
297 	int *cropped_offset = &vout->cropped_offset;
298 	int vr_ps = 1, ps = 2, temp_ps = 2;
299 	int offset = 0, ctop = 0, cleft = 0, line_length = 0;
300 
301 	rotation = calc_rotation(vout);
302 
303 	if (V4L2_PIX_FMT_YUYV == pix->pixelformat ||
304 			V4L2_PIX_FMT_UYVY == pix->pixelformat) {
305 		if (is_rotation_enabled(vout)) {
306 			/*
307 			 * ps    - Actual pixel size for YUYV/UYVY for
308 			 *         VRFB/Mirroring is 4 bytes
309 			 * vr_ps - Virtually pixel size for YUYV/UYVY is
310 			 *         2 bytes
311 			 */
312 			ps = 4;
313 			vr_ps = 2;
314 		} else {
315 			ps = 2;	/* otherwise the pixel size is 2 byte */
316 		}
317 	} else if (V4L2_PIX_FMT_RGB32 == pix->pixelformat) {
318 		ps = 4;
319 	} else if (V4L2_PIX_FMT_RGB24 == pix->pixelformat) {
320 		ps = 3;
321 	}
322 	vout->ps = ps;
323 	vout->vr_ps = vr_ps;
324 
325 	if (is_rotation_enabled(vout)) {
326 		line_length = MAX_PIXELS_PER_LINE;
327 		ctop = (pix->height - crop->height) - crop->top;
328 		cleft = (pix->width - crop->width) - crop->left;
329 	} else {
330 		line_length = pix->width;
331 	}
332 	vout->line_length = line_length;
333 	switch (rotation) {
334 	case dss_rotation_90_degree:
335 		offset = vout->vrfb_context[0].yoffset *
336 			vout->vrfb_context[0].bytespp;
337 		temp_ps = ps / vr_ps;
338 		if (mirroring == 0) {
339 			*cropped_offset = offset + line_length *
340 				temp_ps * cleft + crop->top * temp_ps;
341 		} else {
342 			*cropped_offset = offset + line_length * temp_ps *
343 				cleft + crop->top * temp_ps + (line_length *
344 				((crop->width / (vr_ps)) - 1) * ps);
345 		}
346 		break;
347 	case dss_rotation_180_degree:
348 		offset = ((MAX_PIXELS_PER_LINE * vout->vrfb_context[0].yoffset *
349 			vout->vrfb_context[0].bytespp) +
350 			(vout->vrfb_context[0].xoffset *
351 			vout->vrfb_context[0].bytespp));
352 		if (mirroring == 0) {
353 			*cropped_offset = offset + (line_length * ps * ctop) +
354 				(cleft / vr_ps) * ps;
355 
356 		} else {
357 			*cropped_offset = offset + (line_length * ps * ctop) +
358 				(cleft / vr_ps) * ps + (line_length *
359 				(crop->height - 1) * ps);
360 		}
361 		break;
362 	case dss_rotation_270_degree:
363 		offset = MAX_PIXELS_PER_LINE * vout->vrfb_context[0].xoffset *
364 			vout->vrfb_context[0].bytespp;
365 		temp_ps = ps / vr_ps;
366 		if (mirroring == 0) {
367 			*cropped_offset = offset + line_length *
368 			    temp_ps * crop->left + ctop * ps;
369 		} else {
370 			*cropped_offset = offset + line_length *
371 				temp_ps * crop->left + ctop * ps +
372 				(line_length * ((crop->width / vr_ps) - 1) *
373 				 ps);
374 		}
375 		break;
376 	case dss_rotation_0_degree:
377 		if (mirroring == 0) {
378 			*cropped_offset = (line_length * ps) *
379 				crop->top + (crop->left / vr_ps) * ps;
380 		} else {
381 			*cropped_offset = (line_length * ps) *
382 				crop->top + (crop->left / vr_ps) * ps +
383 				(line_length * (crop->height - 1) * ps);
384 		}
385 		break;
386 	default:
387 		*cropped_offset = (line_length * ps * crop->top) /
388 			vr_ps + (crop->left * ps) / vr_ps +
389 			((crop->width / vr_ps) - 1) * ps;
390 		break;
391 	}
392 }
393