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