drivers/media/platform/omap/omap_vout_vrfb.c

   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 #include <linux/slab.h>
  16
  17 #include <media/videobuf-dma-contig.h>
  18 #include <media/v4l2-device.h>
  19
  20 #include <video/omapvrfb.h>
  21
  22 #include "omap_voutdef.h"
  23 #include "omap_voutlib.h"
  24 #include "omap_vout_vrfb.h"
  25
  26 #define OMAP_DMA_NO_DEVICE      0
  27
  28 /*
  29  * Function for allocating video buffers
  30  */
  31 static int omap_vout_allocate_vrfb_buffers(struct omap_vout_device *vout,
  32                 unsigned int *count, int startindex)
  33 {
  34         int i, j;
  35
  36         for (i = 0; i < *count; i++) {
  37                 if (!vout->smsshado_virt_addr[i]) {
  38                         vout->smsshado_virt_addr[i] =
  39                                 omap_vout_alloc_buffer(vout->smsshado_size,
  40                                                 &vout->smsshado_phy_addr[i]);
  41                 }
  42                 if (!vout->smsshado_virt_addr[i] && startindex != -1) {
  43                         if (V4L2_MEMORY_MMAP == vout->memory && i >= startindex)
  44                                 break;
  45                 }
  46                 if (!vout->smsshado_virt_addr[i]) {
  47                         for (j = 0; j < i; j++) {
  48                                 omap_vout_free_buffer(
  49                                                 vout->smsshado_virt_addr[j],
  50                                                 vout->smsshado_size);
  51                                 vout->smsshado_virt_addr[j] = 0;
  52                                 vout->smsshado_phy_addr[j] = 0;
  53                         }
  54                         *count = 0;
  55                         return -ENOMEM;
  56                 }
  57                 memset((void *)(long)vout->smsshado_virt_addr[i], 0,
  58                        vout->smsshado_size);
  59         }
  60         return 0;
  61 }
  62
  63 /*
  64  * Wakes up the application once the DMA transfer to VRFB space is completed.
  65  */
  66 static void omap_vout_vrfb_dma_tx_callback(void *data)
  67 {
  68         struct vid_vrfb_dma *t = (struct vid_vrfb_dma *) data;
  69
  70         t->tx_status = 1;
  71         wake_up_interruptible(&t->wait);
  72 }
  73
  74 /*
  75  * Free VRFB buffers
  76  */
  77 void omap_vout_free_vrfb_buffers(struct omap_vout_device *vout)
  78 {
  79         int j;
  80
  81         for (j = 0; j < VRFB_NUM_BUFS; j++) {
  82                 if (vout->smsshado_virt_addr[j]) {
  83                         omap_vout_free_buffer(vout->smsshado_virt_addr[j],
  84                                               vout->smsshado_size);
  85                         vout->smsshado_virt_addr[j] = 0;
  86                         vout->smsshado_phy_addr[j] = 0;
  87                 }
  88         }
  89 }
  90
  91 int omap_vout_setup_vrfb_bufs(struct platform_device *pdev, int vid_num,
  92                               bool static_vrfb_allocation)
  93 {
  94         int ret = 0, i, j;
  95         struct omap_vout_device *vout;
  96         struct video_device *vfd;
  97         dma_cap_mask_t mask;
  98         int image_width, image_height;
  99         int vrfb_num_bufs = VRFB_NUM_BUFS;
 100         struct v4l2_device *v4l2_dev = platform_get_drvdata(pdev);
 101         struct omap2video_device *vid_dev =
 102                 container_of(v4l2_dev, struct omap2video_device, v4l2_dev);
 103
 104         vout = vid_dev->vouts[vid_num];
 105         vfd = vout->vfd;
 106
 107         for (i = 0; i < VRFB_NUM_BUFS; i++) {
 108                 if (omap_vrfb_request_ctx(&vout->vrfb_context[i])) {
 109                         dev_info(&pdev->dev, ": VRFB allocation failed\n");
 110                         for (j = 0; j < i; j++)
 111                                 omap_vrfb_release_ctx(&vout->vrfb_context[j]);
 112                         ret = -ENOMEM;
 113                         goto free_buffers;
 114                 }
 115         }
 116
 117         /* Calculate VRFB memory size */
 118         /* allocate for worst case size */
 119         image_width = VID_MAX_WIDTH / TILE_SIZE;
 120         if (VID_MAX_WIDTH % TILE_SIZE)
 121                 image_width++;
 122
 123         image_width = image_width * TILE_SIZE;
 124         image_height = VID_MAX_HEIGHT / TILE_SIZE;
 125
 126         if (VID_MAX_HEIGHT % TILE_SIZE)
 127                 image_height++;
 128
 129         image_height = image_height * TILE_SIZE;
 130         vout->smsshado_size = PAGE_ALIGN(image_width * image_height * 2 * 2);
 131
 132         /*
 133          * Request and Initialize DMA, for DMA based VRFB transfer
 134          */
 135         dma_cap_zero(mask);
 136         dma_cap_set(DMA_INTERLEAVE, mask);
 137         vout->vrfb_dma_tx.chan = dma_request_chan_by_mask(&mask);
 138         if (IS_ERR(vout->vrfb_dma_tx.chan)) {
 139                 vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
 140         } else {
 141                 size_t xt_size = sizeof(struct dma_interleaved_template) +
 142                                  sizeof(struct data_chunk);
 143
 144                 vout->vrfb_dma_tx.xt = kzalloc(xt_size, GFP_KERNEL);
 145                 if (!vout->vrfb_dma_tx.xt) {
 146                         dma_release_channel(vout->vrfb_dma_tx.chan);
 147                         vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
 148                 }
 149         }
 150
 151         if (vout->vrfb_dma_tx.req_status == DMA_CHAN_NOT_ALLOTED)
 152                 dev_info(&pdev->dev,
 153                          ": failed to allocate DMA Channel for video%d\n",
 154                          vfd->minor);
 155
 156         init_waitqueue_head(&vout->vrfb_dma_tx.wait);
 157
 158         /* statically allocated the VRFB buffer is done through
 159            commands line aruments */
 160         if (static_vrfb_allocation) {
 161                 if (omap_vout_allocate_vrfb_buffers(vout, &vrfb_num_bufs, -1)) {
 162                         ret =  -ENOMEM;
 163                         goto release_vrfb_ctx;
 164                 }
 165                 vout->vrfb_static_allocation = true;
 166         }
 167         return 0;
 168
 169 release_vrfb_ctx:
 170         for (j = 0; j < VRFB_NUM_BUFS; j++)
 171                 omap_vrfb_release_ctx(&vout->vrfb_context[j]);
 172 free_buffers:
 173         omap_vout_free_buffers(vout);
 174
 175         return ret;
 176 }
 177
 178 /*
 179  * Release the VRFB context once the module exits
 180  */
 181 void omap_vout_release_vrfb(struct omap_vout_device *vout)
 182 {
 183         int i;
 184
 185         for (i = 0; i < VRFB_NUM_BUFS; i++)
 186                 omap_vrfb_release_ctx(&vout->vrfb_context[i]);
 187
 188         if (vout->vrfb_dma_tx.req_status == DMA_CHAN_ALLOTED) {
 189                 vout->vrfb_dma_tx.req_status = DMA_CHAN_NOT_ALLOTED;
 190                 kfree(vout->vrfb_dma_tx.xt);
 191                 dmaengine_terminate_sync(vout->vrfb_dma_tx.chan);
 192                 dma_release_channel(vout->vrfb_dma_tx.chan);
 193         }
 194 }
 195
 196 /*
 197  * Allocate the buffers for the VRFB space.  Data is copied from V4L2
 198  * buffers to the VRFB buffers using the DMA engine.
 199  */
 200 int omap_vout_vrfb_buffer_setup(struct omap_vout_device *vout,
 201                           unsigned int *count, unsigned int startindex)
 202 {
 203         int i;
 204         bool yuv_mode;
 205
 206         if (!is_rotation_enabled(vout))
 207                 return 0;
 208
 209         /* If rotation is enabled, allocate memory for VRFB space also */
 210         *count = *count > VRFB_NUM_BUFS ? VRFB_NUM_BUFS : *count;
 211
 212         /* Allocate the VRFB buffers only if the buffers are not
 213          * allocated during init time.
 214          */
 215         if (!vout->vrfb_static_allocation)
 216                 if (omap_vout_allocate_vrfb_buffers(vout, count, startindex))
 217                         return -ENOMEM;
 218
 219         if (vout->dss_mode == OMAP_DSS_COLOR_YUV2 ||
 220                         vout->dss_mode == OMAP_DSS_COLOR_UYVY)
 221                 yuv_mode = true;
 222         else
 223                 yuv_mode = false;
 224
 225         for (i = 0; i < *count; i++)
 226                 omap_vrfb_setup(&vout->vrfb_context[i],
 227                                 vout->smsshado_phy_addr[i], vout->pix.width,
 228                                 vout->pix.height, vout->bpp, yuv_mode);
 229
 230         return 0;
 231 }
 232
 233 int omap_vout_prepare_vrfb(struct omap_vout_device *vout,
 234                            struct videobuf_buffer *vb)
 235 {
 236         struct dma_async_tx_descriptor *tx;
 237         enum dma_ctrl_flags flags = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
 238         struct dma_chan *chan = vout->vrfb_dma_tx.chan;
 239         struct dma_interleaved_template *xt = vout->vrfb_dma_tx.xt;
 240         dma_cookie_t cookie;
 241         enum dma_status status;
 242         enum dss_rotation rotation;
 243         size_t dst_icg;
 244         u32 pixsize;
 245
 246         if (!is_rotation_enabled(vout))
 247                 return 0;
 248
 249         /* If rotation is enabled, copy input buffer into VRFB
 250          * memory space using DMA. We are copying input buffer
 251          * into VRFB memory space of desired angle and DSS will
 252          * read image VRFB memory for 0 degree angle
 253          */
 254
 255         pixsize = vout->bpp * vout->vrfb_bpp;
 256         dst_icg = ((MAX_PIXELS_PER_LINE * pixsize) -
 257                   (vout->pix.width * vout->bpp)) + 1;
 258
 259         xt->src_start = vout->buf_phy_addr[vb->i];
 260         xt->dst_start = vout->vrfb_context[vb->i].paddr[0];
 261
 262         xt->numf = vout->pix.height;
 263         xt->frame_size = 1;
 264         xt->sgl[0].size = vout->pix.width * vout->bpp;
 265         xt->sgl[0].icg = dst_icg;
 266
 267         xt->dir = DMA_MEM_TO_MEM;
 268         xt->src_sgl = false;
 269         xt->src_inc = true;
 270         xt->dst_sgl = true;
 271         xt->dst_inc = true;
 272
 273         tx = dmaengine_prep_interleaved_dma(chan, xt, flags);
 274         if (tx == NULL) {
 275                 pr_err("%s: DMA interleaved prep error\n", __func__);
 276                 return -EINVAL;
 277         }
 278
 279         tx->callback = omap_vout_vrfb_dma_tx_callback;
 280         tx->callback_param = &vout->vrfb_dma_tx;
 281
 282         cookie = dmaengine_submit(tx);
 283         if (dma_submit_error(cookie)) {
 284                 pr_err("%s: dmaengine_submit failed (%d)\n", __func__, cookie);
 285                 return -EINVAL;
 286         }
 287
 288         vout->vrfb_dma_tx.tx_status = 0;
 289         dma_async_issue_pending(chan);
 290
 291         wait_event_interruptible_timeout(vout->vrfb_dma_tx.wait,
 292                                          vout->vrfb_dma_tx.tx_status == 1,
 293                                          VRFB_TX_TIMEOUT);
 294
 295         status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
 296
 297         if (vout->vrfb_dma_tx.tx_status == 0) {
 298                 pr_err("%s: Timeout while waiting for DMA\n", __func__);
 299                 dmaengine_terminate_sync(chan);
 300                 return -EINVAL;
 301         } else if (status != DMA_COMPLETE) {
 302                 pr_err("%s: DMA completion %s status\n", __func__,
 303                        status == DMA_ERROR ? "error" : "busy");
 304                 dmaengine_terminate_sync(chan);
 305                 return -EINVAL;
 306         }
 307
 308         /* Store buffers physical address into an array. Addresses
 309          * from this array will be used to configure DSS */
 310         rotation = calc_rotation(vout);
 311         vout->queued_buf_addr[vb->i] = (u8 *)
 312                 vout->vrfb_context[vb->i].paddr[rotation];
 313         return 0;
 314 }
 315
 316 /*
 317  * Calculate the buffer offsets from which the streaming should
 318  * start. This offset calculation is mainly required because of
 319  * the VRFB 32 pixels alignment with rotation.
 320  */
 321 void omap_vout_calculate_vrfb_offset(struct omap_vout_device *vout)
 322 {
 323         enum dss_rotation rotation;
 324         bool mirroring = vout->mirror;
 325         struct v4l2_rect *crop = &vout->crop;
 326         struct v4l2_pix_format *pix = &vout->pix;
 327         int *cropped_offset = &vout->cropped_offset;
 328         int vr_ps = 1, ps = 2, temp_ps = 2;
 329         int offset = 0, ctop = 0, cleft = 0, line_length = 0;
 330
 331         rotation = calc_rotation(vout);
 332
 333         if (V4L2_PIX_FMT_YUYV == pix->pixelformat ||
 334                         V4L2_PIX_FMT_UYVY == pix->pixelformat) {
 335                 if (is_rotation_enabled(vout)) {
 336                         /*
 337                          * ps    - Actual pixel size for YUYV/UYVY for
 338                          *         VRFB/Mirroring is 4 bytes
 339                          * vr_ps - Virtually pixel size for YUYV/UYVY is
 340                          *         2 bytes
 341                          */
 342                         ps = 4;
 343                         vr_ps = 2;
 344                 } else {
 345                         ps = 2; /* otherwise the pixel size is 2 byte */
 346                 }
 347         } else if (V4L2_PIX_FMT_RGB32 == pix->pixelformat) {
 348                 ps = 4;
 349         } else if (V4L2_PIX_FMT_RGB24 == pix->pixelformat) {
 350                 ps = 3;
 351         }
 352         vout->ps = ps;
 353         vout->vr_ps = vr_ps;
 354
 355         if (is_rotation_enabled(vout)) {
 356                 line_length = MAX_PIXELS_PER_LINE;
 357                 ctop = (pix->height - crop->height) - crop->top;
 358                 cleft = (pix->width - crop->width) - crop->left;
 359         } else {
 360                 line_length = pix->width;
 361         }
 362         vout->line_length = line_length;
 363         switch (rotation) {
 364         case dss_rotation_90_degree:
 365                 offset = vout->vrfb_context[0].yoffset *
 366                         vout->vrfb_context[0].bytespp;
 367                 temp_ps = ps / vr_ps;
 368                 if (!mirroring) {
 369                         *cropped_offset = offset + line_length *
 370                                 temp_ps * cleft + crop->top * temp_ps;
 371                 } else {
 372                         *cropped_offset = offset + line_length * temp_ps *
 373                                 cleft + crop->top * temp_ps + (line_length *
 374                                 ((crop->width / (vr_ps)) - 1) * ps);
 375                 }
 376                 break;
 377         case dss_rotation_180_degree:
 378                 offset = ((MAX_PIXELS_PER_LINE * vout->vrfb_context[0].yoffset *
 379                         vout->vrfb_context[0].bytespp) +
 380                         (vout->vrfb_context[0].xoffset *
 381                         vout->vrfb_context[0].bytespp));
 382                 if (!mirroring) {
 383                         *cropped_offset = offset + (line_length * ps * ctop) +
 384                                 (cleft / vr_ps) * ps;
 385
 386                 } else {
 387                         *cropped_offset = offset + (line_length * ps * ctop) +
 388                                 (cleft / vr_ps) * ps + (line_length *
 389                                 (crop->height - 1) * ps);
 390                 }
 391                 break;
 392         case dss_rotation_270_degree:
 393                 offset = MAX_PIXELS_PER_LINE * vout->vrfb_context[0].xoffset *
 394                         vout->vrfb_context[0].bytespp;
 395                 temp_ps = ps / vr_ps;
 396                 if (!mirroring) {
 397                         *cropped_offset = offset + line_length *
 398                             temp_ps * crop->left + ctop * ps;
 399                 } else {
 400                         *cropped_offset = offset + line_length *
 401                                 temp_ps * crop->left + ctop * ps +
 402                                 (line_length * ((crop->width / vr_ps) - 1) *
 403                                  ps);
 404                 }
 405                 break;
 406         case dss_rotation_0_degree:
 407                 if (!mirroring) {
 408                         *cropped_offset = (line_length * ps) *
 409                                 crop->top + (crop->left / vr_ps) * ps;
 410                 } else {
 411                         *cropped_offset = (line_length * ps) *
 412                                 crop->top + (crop->left / vr_ps) * ps +
 413                                 (line_length * (crop->height - 1) * ps);
 414                 }
 415                 break;
 416         default:
 417                 *cropped_offset = (line_length * ps * crop->top) /
 418                         vr_ps + (crop->left * ps) / vr_ps +
 419                         ((crop->width / vr_ps) - 1) * ps;
 420                 break;
 421         }
 422 }