drivers/media/platform/omap3isp/isphist.c

   1 /*
   2  * isphist.c
   3  *
   4  * TI OMAP3 ISP - Histogram module
   5  *
   6  * Copyright (C) 2010 Nokia Corporation
   7  * Copyright (C) 2009 Texas Instruments, Inc.
   8  *
   9  * Contacts: David Cohen <dacohen@gmail.com>
  10  *           Laurent Pinchart <laurent.pinchart@ideasonboard.com>
  11  *           Sakari Ailus <sakari.ailus@iki.fi>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  25  * 02110-1301 USA
  26  */
  27
  28 #include <linux/delay.h>
  29 #include <linux/slab.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/device.h>
  32
  33 #include "isp.h"
  34 #include "ispreg.h"
  35 #include "isphist.h"
  36
  37 #define HIST_CONFIG_DMA 1
  38
  39 #define HIST_USING_DMA(hist) ((hist)->dma_ch >= 0)
  40
  41 /*
  42  * hist_reset_mem - clear Histogram memory before start stats engine.
  43  */
  44 static void hist_reset_mem(struct ispstat *hist)
  45 {
  46         struct isp_device *isp = hist->isp;
  47         struct omap3isp_hist_config *conf = hist->priv;
  48         unsigned int i;
  49
  50         isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR);
  51
  52         /*
  53          * By setting it, the histogram internal buffer is being cleared at the
  54          * same time it's being read. This bit must be cleared afterwards.
  55          */
  56         isp_reg_set(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR);
  57
  58         /*
  59          * We'll clear 4 words at each iteration for optimization. It avoids
  60          * 3/4 of the jumps. We also know HIST_MEM_SIZE is divisible by 4.
  61          */
  62         for (i = OMAP3ISP_HIST_MEM_SIZE / 4; i > 0; i--) {
  63                 isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
  64                 isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
  65                 isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
  66                 isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
  67         }
  68         isp_reg_clr(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR);
  69
  70         hist->wait_acc_frames = conf->num_acc_frames;
  71 }
  72
  73 static void hist_dma_config(struct ispstat *hist)
  74 {
  75         hist->dma_config.data_type = OMAP_DMA_DATA_TYPE_S32;
  76         hist->dma_config.sync_mode = OMAP_DMA_SYNC_ELEMENT;
  77         hist->dma_config.frame_count = 1;
  78         hist->dma_config.src_amode = OMAP_DMA_AMODE_CONSTANT;
  79         hist->dma_config.src_start = OMAP3ISP_HIST_REG_BASE + ISPHIST_DATA;
  80         hist->dma_config.dst_amode = OMAP_DMA_AMODE_POST_INC;
  81         hist->dma_config.src_or_dst_synch = OMAP_DMA_SRC_SYNC;
  82 }
  83
  84 /*
  85  * hist_setup_regs - Helper function to update Histogram registers.
  86  */
  87 static void hist_setup_regs(struct ispstat *hist, void *priv)
  88 {
  89         struct isp_device *isp = hist->isp;
  90         struct omap3isp_hist_config *conf = priv;
  91         int c;
  92         u32 cnt;
  93         u32 wb_gain;
  94         u32 reg_hor[OMAP3ISP_HIST_MAX_REGIONS];
  95         u32 reg_ver[OMAP3ISP_HIST_MAX_REGIONS];
  96
  97         if (!hist->update || hist->state == ISPSTAT_DISABLED ||
  98             hist->state == ISPSTAT_DISABLING)
  99                 return;
 100
 101         cnt = conf->cfa << ISPHIST_CNT_CFA_SHIFT;
 102
 103         wb_gain = conf->wg[0] << ISPHIST_WB_GAIN_WG00_SHIFT;
 104         wb_gain |= conf->wg[1] << ISPHIST_WB_GAIN_WG01_SHIFT;
 105         wb_gain |= conf->wg[2] << ISPHIST_WB_GAIN_WG02_SHIFT;
 106         if (conf->cfa == OMAP3ISP_HIST_CFA_BAYER)
 107                 wb_gain |= conf->wg[3] << ISPHIST_WB_GAIN_WG03_SHIFT;
 108
 109         /* Regions size and position */
 110         for (c = 0; c < OMAP3ISP_HIST_MAX_REGIONS; c++) {
 111                 if (c < conf->num_regions) {
 112                         reg_hor[c] = conf->region[c].h_start <<
 113                                      ISPHIST_REG_START_SHIFT;
 114                         reg_hor[c] = conf->region[c].h_end <<
 115                                      ISPHIST_REG_END_SHIFT;
 116                         reg_ver[c] = conf->region[c].v_start <<
 117                                      ISPHIST_REG_START_SHIFT;
 118                         reg_ver[c] = conf->region[c].v_end <<
 119                                      ISPHIST_REG_END_SHIFT;
 120                 } else {
 121                         reg_hor[c] = 0;
 122                         reg_ver[c] = 0;
 123                 }
 124         }
 125
 126         cnt |= conf->hist_bins << ISPHIST_CNT_BINS_SHIFT;
 127         switch (conf->hist_bins) {
 128         case OMAP3ISP_HIST_BINS_256:
 129                 cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 8) <<
 130                         ISPHIST_CNT_SHIFT_SHIFT;
 131                 break;
 132         case OMAP3ISP_HIST_BINS_128:
 133                 cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 7) <<
 134                         ISPHIST_CNT_SHIFT_SHIFT;
 135                 break;
 136         case OMAP3ISP_HIST_BINS_64:
 137                 cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 6) <<
 138                         ISPHIST_CNT_SHIFT_SHIFT;
 139                 break;
 140         default: /* OMAP3ISP_HIST_BINS_32 */
 141                 cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 5) <<
 142                         ISPHIST_CNT_SHIFT_SHIFT;
 143                 break;
 144         }
 145
 146         hist_reset_mem(hist);
 147
 148         isp_reg_writel(isp, cnt, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT);
 149         isp_reg_writel(isp, wb_gain,  OMAP3_ISP_IOMEM_HIST, ISPHIST_WB_GAIN);
 150         isp_reg_writel(isp, reg_hor[0], OMAP3_ISP_IOMEM_HIST, ISPHIST_R0_HORZ);
 151         isp_reg_writel(isp, reg_ver[0], OMAP3_ISP_IOMEM_HIST, ISPHIST_R0_VERT);
 152         isp_reg_writel(isp, reg_hor[1], OMAP3_ISP_IOMEM_HIST, ISPHIST_R1_HORZ);
 153         isp_reg_writel(isp, reg_ver[1], OMAP3_ISP_IOMEM_HIST, ISPHIST_R1_VERT);
 154         isp_reg_writel(isp, reg_hor[2], OMAP3_ISP_IOMEM_HIST, ISPHIST_R2_HORZ);
 155         isp_reg_writel(isp, reg_ver[2], OMAP3_ISP_IOMEM_HIST, ISPHIST_R2_VERT);
 156         isp_reg_writel(isp, reg_hor[3], OMAP3_ISP_IOMEM_HIST, ISPHIST_R3_HORZ);
 157         isp_reg_writel(isp, reg_ver[3], OMAP3_ISP_IOMEM_HIST, ISPHIST_R3_VERT);
 158
 159         hist->update = 0;
 160         hist->config_counter += hist->inc_config;
 161         hist->inc_config = 0;
 162         hist->buf_size = conf->buf_size;
 163 }
 164
 165 static void hist_enable(struct ispstat *hist, int enable)
 166 {
 167         if (enable) {
 168                 isp_reg_set(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR,
 169                             ISPHIST_PCR_ENABLE);
 170                 omap3isp_subclk_enable(hist->isp, OMAP3_ISP_SUBCLK_HIST);
 171         } else {
 172                 isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR,
 173                             ISPHIST_PCR_ENABLE);
 174                 omap3isp_subclk_disable(hist->isp, OMAP3_ISP_SUBCLK_HIST);
 175         }
 176 }
 177
 178 static int hist_busy(struct ispstat *hist)
 179 {
 180         return isp_reg_readl(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR)
 181                                                 & ISPHIST_PCR_BUSY;
 182 }
 183
 184 static void hist_dma_cb(int lch, u16 ch_status, void *data)
 185 {
 186         struct ispstat *hist = data;
 187
 188         if (ch_status & ~OMAP_DMA_BLOCK_IRQ) {
 189                 dev_dbg(hist->isp->dev, "hist: DMA error. status = 0x%04x\n",
 190                         ch_status);
 191                 omap_stop_dma(lch);
 192                 hist_reset_mem(hist);
 193                 atomic_set(&hist->buf_err, 1);
 194         }
 195         isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT,
 196                     ISPHIST_CNT_CLEAR);
 197
 198         omap3isp_stat_dma_isr(hist);
 199         if (hist->state != ISPSTAT_DISABLED)
 200                 omap3isp_hist_dma_done(hist->isp);
 201 }
 202
 203 static int hist_buf_dma(struct ispstat *hist)
 204 {
 205         dma_addr_t dma_addr = hist->active_buf->dma_addr;
 206
 207         if (unlikely(!dma_addr)) {
 208                 dev_dbg(hist->isp->dev, "hist: invalid DMA buffer address\n");
 209                 hist_reset_mem(hist);
 210                 return STAT_NO_BUF;
 211         }
 212
 213         isp_reg_writel(hist->isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR);
 214         isp_reg_set(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT,
 215                     ISPHIST_CNT_CLEAR);
 216         omap3isp_flush(hist->isp);
 217         hist->dma_config.dst_start = dma_addr;
 218         hist->dma_config.elem_count = hist->buf_size / sizeof(u32);
 219         omap_set_dma_params(hist->dma_ch, &hist->dma_config);
 220
 221         omap_start_dma(hist->dma_ch);
 222
 223         return STAT_BUF_WAITING_DMA;
 224 }
 225
 226 static int hist_buf_pio(struct ispstat *hist)
 227 {
 228         struct isp_device *isp = hist->isp;
 229         u32 *buf = hist->active_buf->virt_addr;
 230         unsigned int i;
 231
 232         if (!buf) {
 233                 dev_dbg(isp->dev, "hist: invalid PIO buffer address\n");
 234                 hist_reset_mem(hist);
 235                 return STAT_NO_BUF;
 236         }
 237
 238         isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR);
 239
 240         /*
 241          * By setting it, the histogram internal buffer is being cleared at the
 242          * same time it's being read. This bit must be cleared just after all
 243          * data is acquired.
 244          */
 245         isp_reg_set(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR);
 246
 247         /*
 248          * We'll read 4 times a 4-bytes-word at each iteration for
 249          * optimization. It avoids 3/4 of the jumps. We also know buf_size is
 250          * divisible by 16.
 251          */
 252         for (i = hist->buf_size / 16; i > 0; i--) {
 253                 *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
 254                 *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
 255                 *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
 256                 *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
 257         }
 258         isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT,
 259                     ISPHIST_CNT_CLEAR);
 260
 261         return STAT_BUF_DONE;
 262 }
 263
 264 /*
 265  * hist_buf_process - Callback from ISP driver for HIST interrupt.
 266  */
 267 static int hist_buf_process(struct ispstat *hist)
 268 {
 269         struct omap3isp_hist_config *user_cfg = hist->priv;
 270         int ret;
 271
 272         if (atomic_read(&hist->buf_err) || hist->state != ISPSTAT_ENABLED) {
 273                 hist_reset_mem(hist);
 274                 return STAT_NO_BUF;
 275         }
 276
 277         if (--(hist->wait_acc_frames))
 278                 return STAT_NO_BUF;
 279
 280         if (HIST_USING_DMA(hist))
 281                 ret = hist_buf_dma(hist);
 282         else
 283                 ret = hist_buf_pio(hist);
 284
 285         hist->wait_acc_frames = user_cfg->num_acc_frames;
 286
 287         return ret;
 288 }
 289
 290 static u32 hist_get_buf_size(struct omap3isp_hist_config *conf)
 291 {
 292         return OMAP3ISP_HIST_MEM_SIZE_BINS(conf->hist_bins) * conf->num_regions;
 293 }
 294
 295 /*
 296  * hist_validate_params - Helper function to check user given params.
 297  * @user_cfg: Pointer to user configuration structure.
 298  *
 299  * Returns 0 on success configuration.
 300  */
 301 static int hist_validate_params(struct ispstat *hist, void *new_conf)
 302 {
 303         struct omap3isp_hist_config *user_cfg = new_conf;
 304         int c;
 305         u32 buf_size;
 306
 307         if (user_cfg->cfa > OMAP3ISP_HIST_CFA_FOVEONX3)
 308                 return -EINVAL;
 309
 310         /* Regions size and position */
 311
 312         if ((user_cfg->num_regions < OMAP3ISP_HIST_MIN_REGIONS) ||
 313             (user_cfg->num_regions > OMAP3ISP_HIST_MAX_REGIONS))
 314                 return -EINVAL;
 315
 316         /* Regions */
 317         for (c = 0; c < user_cfg->num_regions; c++) {
 318                 if (user_cfg->region[c].h_start & ~ISPHIST_REG_START_END_MASK)
 319                         return -EINVAL;
 320                 if (user_cfg->region[c].h_end & ~ISPHIST_REG_START_END_MASK)
 321                         return -EINVAL;
 322                 if (user_cfg->region[c].v_start & ~ISPHIST_REG_START_END_MASK)
 323                         return -EINVAL;
 324                 if (user_cfg->region[c].v_end & ~ISPHIST_REG_START_END_MASK)
 325                         return -EINVAL;
 326                 if (user_cfg->region[c].h_start > user_cfg->region[c].h_end)
 327                         return -EINVAL;
 328                 if (user_cfg->region[c].v_start > user_cfg->region[c].v_end)
 329                         return -EINVAL;
 330         }
 331
 332         switch (user_cfg->num_regions) {
 333         case 1:
 334                 if (user_cfg->hist_bins > OMAP3ISP_HIST_BINS_256)
 335                         return -EINVAL;
 336                 break;
 337         case 2:
 338                 if (user_cfg->hist_bins > OMAP3ISP_HIST_BINS_128)
 339                         return -EINVAL;
 340                 break;
 341         default: /* 3 or 4 */
 342                 if (user_cfg->hist_bins > OMAP3ISP_HIST_BINS_64)
 343                         return -EINVAL;
 344                 break;
 345         }
 346
 347         buf_size = hist_get_buf_size(user_cfg);
 348         if (buf_size > user_cfg->buf_size)
 349                 /* User's buf_size request wasn't enoght */
 350                 user_cfg->buf_size = buf_size;
 351         else if (user_cfg->buf_size > OMAP3ISP_HIST_MAX_BUF_SIZE)
 352                 user_cfg->buf_size = OMAP3ISP_HIST_MAX_BUF_SIZE;
 353
 354         return 0;
 355 }
 356
 357 static int hist_comp_params(struct ispstat *hist,
 358                             struct omap3isp_hist_config *user_cfg)
 359 {
 360         struct omap3isp_hist_config *cur_cfg = hist->priv;
 361         int c;
 362
 363         if (cur_cfg->cfa != user_cfg->cfa)
 364                 return 1;
 365
 366         if (cur_cfg->num_acc_frames != user_cfg->num_acc_frames)
 367                 return 1;
 368
 369         if (cur_cfg->hist_bins != user_cfg->hist_bins)
 370                 return 1;
 371
 372         for (c = 0; c < OMAP3ISP_HIST_MAX_WG; c++) {
 373                 if (c == 3 && user_cfg->cfa == OMAP3ISP_HIST_CFA_FOVEONX3)
 374                         break;
 375                 else if (cur_cfg->wg[c] != user_cfg->wg[c])
 376                         return 1;
 377         }
 378
 379         if (cur_cfg->num_regions != user_cfg->num_regions)
 380                 return 1;
 381
 382         /* Regions */
 383         for (c = 0; c < user_cfg->num_regions; c++) {
 384                 if (cur_cfg->region[c].h_start != user_cfg->region[c].h_start)
 385                         return 1;
 386                 if (cur_cfg->region[c].h_end != user_cfg->region[c].h_end)
 387                         return 1;
 388                 if (cur_cfg->region[c].v_start != user_cfg->region[c].v_start)
 389                         return 1;
 390                 if (cur_cfg->region[c].v_end != user_cfg->region[c].v_end)
 391                         return 1;
 392         }
 393
 394         return 0;
 395 }
 396
 397 /*
 398  * hist_update_params - Helper function to check and store user given params.
 399  * @new_conf: Pointer to user configuration structure.
 400  */
 401 static void hist_set_params(struct ispstat *hist, void *new_conf)
 402 {
 403         struct omap3isp_hist_config *user_cfg = new_conf;
 404         struct omap3isp_hist_config *cur_cfg = hist->priv;
 405
 406         if (!hist->configured || hist_comp_params(hist, user_cfg)) {
 407                 memcpy(cur_cfg, user_cfg, sizeof(*user_cfg));
 408                 if (user_cfg->num_acc_frames == 0)
 409                         user_cfg->num_acc_frames = 1;
 410                 hist->inc_config++;
 411                 hist->update = 1;
 412                 /*
 413                  * User might be asked for a bigger buffer than necessary for
 414                  * this configuration. In order to return the right amount of
 415                  * data during buffer request, let's calculate the size here
 416                  * instead of stick with user_cfg->buf_size.
 417                  */
 418                 cur_cfg->buf_size = hist_get_buf_size(cur_cfg);
 419
 420         }
 421 }
 422
 423 static long hist_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
 424 {
 425         struct ispstat *stat = v4l2_get_subdevdata(sd);
 426
 427         switch (cmd) {
 428         case VIDIOC_OMAP3ISP_HIST_CFG:
 429                 return omap3isp_stat_config(stat, arg);
 430         case VIDIOC_OMAP3ISP_STAT_REQ:
 431                 return omap3isp_stat_request_statistics(stat, arg);
 432         case VIDIOC_OMAP3ISP_STAT_EN: {
 433                 int *en = arg;
 434                 return omap3isp_stat_enable(stat, !!*en);
 435         }
 436         }
 437
 438         return -ENOIOCTLCMD;
 439
 440 }
 441
 442 static const struct ispstat_ops hist_ops = {
 443         .validate_params        = hist_validate_params,
 444         .set_params             = hist_set_params,
 445         .setup_regs             = hist_setup_regs,
 446         .enable                 = hist_enable,
 447         .busy                   = hist_busy,
 448         .buf_process            = hist_buf_process,
 449 };
 450
 451 static const struct v4l2_subdev_core_ops hist_subdev_core_ops = {
 452         .ioctl = hist_ioctl,
 453         .subscribe_event = omap3isp_stat_subscribe_event,
 454         .unsubscribe_event = omap3isp_stat_unsubscribe_event,
 455 };
 456
 457 static const struct v4l2_subdev_video_ops hist_subdev_video_ops = {
 458         .s_stream = omap3isp_stat_s_stream,
 459 };
 460
 461 static const struct v4l2_subdev_ops hist_subdev_ops = {
 462         .core = &hist_subdev_core_ops,
 463         .video = &hist_subdev_video_ops,
 464 };
 465
 466 /*
 467  * omap3isp_hist_init - Module Initialization.
 468  */
 469 int omap3isp_hist_init(struct isp_device *isp)
 470 {
 471         struct ispstat *hist = &isp->isp_hist;
 472         struct omap3isp_hist_config *hist_cfg;
 473         int ret = -1;
 474
 475         hist_cfg = kzalloc(sizeof(*hist_cfg), GFP_KERNEL);
 476         if (hist_cfg == NULL)
 477                 return -ENOMEM;
 478
 479         memset(hist, 0, sizeof(*hist));
 480         if (HIST_CONFIG_DMA)
 481                 ret = omap_request_dma(OMAP24XX_DMA_NO_DEVICE, "DMA_ISP_HIST",
 482                                        hist_dma_cb, hist, &hist->dma_ch);
 483         if (ret) {
 484                 if (HIST_CONFIG_DMA)
 485                         dev_warn(isp->dev, "hist: DMA request channel failed. "
 486                                            "Using PIO only.\n");
 487                 hist->dma_ch = -1;
 488         } else {
 489                 dev_dbg(isp->dev, "hist: DMA channel = %d\n", hist->dma_ch);
 490                 hist_dma_config(hist);
 491                 omap_enable_dma_irq(hist->dma_ch, OMAP_DMA_BLOCK_IRQ);
 492         }
 493
 494         hist->ops = &hist_ops;
 495         hist->priv = hist_cfg;
 496         hist->event_type = V4L2_EVENT_OMAP3ISP_HIST;
 497         hist->isp = isp;
 498
 499         ret = omap3isp_stat_init(hist, "histogram", &hist_subdev_ops);
 500         if (ret) {
 501                 kfree(hist_cfg);
 502                 if (HIST_USING_DMA(hist))
 503                         omap_free_dma(hist->dma_ch);
 504         }
 505
 506         return ret;
 507 }
 508
 509 /*
 510  * omap3isp_hist_cleanup - Module cleanup.
 511  */
 512 void omap3isp_hist_cleanup(struct isp_device *isp)
 513 {
 514         if (HIST_USING_DMA(&isp->isp_hist))
 515                 omap_free_dma(isp->isp_hist.dma_ch);
 516         kfree(isp->isp_hist.priv);
 517         omap3isp_stat_cleanup(&isp->isp_hist);
 518 }