LXR linux/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/device.h>
  20#include <linux/dmaengine.h>
  21#include <linux/slab.h>
  22#include <linux/uaccess.h>
  23
  24#include "isp.h"
  25#include "ispreg.h"
  26#include "isphist.h"
  27
  28#define HIST_CONFIG_DMA 1
  29
  30/*
  31 * hist_reset_mem - clear Histogram memory before start stats engine.
  32 */
  33static void hist_reset_mem(struct ispstat *hist)
  34{
  35        struct isp_device *isp = hist->isp;
  36        struct omap3isp_hist_config *conf = hist->priv;
  37        unsigned int i;
  38
  39        isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR);
  40
  41        /*
  42         * By setting it, the histogram internal buffer is being cleared at the
  43         * same time it's being read. This bit must be cleared afterwards.
  44         */
  45        isp_reg_set(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR);
  46
  47        /*
  48         * We'll clear 4 words at each iteration for optimization. It avoids
  49         * 3/4 of the jumps. We also know HIST_MEM_SIZE is divisible by 4.
  50         */
  51        for (i = OMAP3ISP_HIST_MEM_SIZE / 4; i > 0; i--) {
  52                isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
  53                isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
  54                isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
  55                isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
  56        }
  57        isp_reg_clr(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR);
  58
  59        hist->wait_acc_frames = conf->num_acc_frames;
  60}
  61
  62/*
  63 * hist_setup_regs - Helper function to update Histogram registers.
  64 */
  65static void hist_setup_regs(struct ispstat *hist, void *priv)
  66{
  67        struct isp_device *isp = hist->isp;
  68        struct omap3isp_hist_config *conf = priv;
  69        int c;
  70        u32 cnt;
  71        u32 wb_gain;
  72        u32 reg_hor[OMAP3ISP_HIST_MAX_REGIONS];
  73        u32 reg_ver[OMAP3ISP_HIST_MAX_REGIONS];
  74
  75        if (!hist->update || hist->state == ISPSTAT_DISABLED ||
  76            hist->state == ISPSTAT_DISABLING)
  77                return;
  78
  79        cnt = conf->cfa << ISPHIST_CNT_CFA_SHIFT;
  80
  81        wb_gain = conf->wg[0] << ISPHIST_WB_GAIN_WG00_SHIFT;
  82        wb_gain |= conf->wg[1] << ISPHIST_WB_GAIN_WG01_SHIFT;
  83        wb_gain |= conf->wg[2] << ISPHIST_WB_GAIN_WG02_SHIFT;
  84        if (conf->cfa == OMAP3ISP_HIST_CFA_BAYER)
  85                wb_gain |= conf->wg[3] << ISPHIST_WB_GAIN_WG03_SHIFT;
  86
  87        /* Regions size and position */
  88        for (c = 0; c < OMAP3ISP_HIST_MAX_REGIONS; c++) {
  89                if (c < conf->num_regions) {
  90                        reg_hor[c] = (conf->region[c].h_start <<
  91                                     ISPHIST_REG_START_SHIFT)
  92                                   | (conf->region[c].h_end <<
  93                                     ISPHIST_REG_END_SHIFT);
  94                        reg_ver[c] = (conf->region[c].v_start <<
  95                                     ISPHIST_REG_START_SHIFT)
  96                                   | (conf->region[c].v_end <<
  97                                     ISPHIST_REG_END_SHIFT);
  98                } else {
  99                        reg_hor[c] = 0;
 100                        reg_ver[c] = 0;
 101                }
 102        }
 103
 104        cnt |= conf->hist_bins << ISPHIST_CNT_BINS_SHIFT;
 105        switch (conf->hist_bins) {
 106        case OMAP3ISP_HIST_BINS_256:
 107                cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 8) <<
 108                        ISPHIST_CNT_SHIFT_SHIFT;
 109                break;
 110        case OMAP3ISP_HIST_BINS_128:
 111                cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 7) <<
 112                        ISPHIST_CNT_SHIFT_SHIFT;
 113                break;
 114        case OMAP3ISP_HIST_BINS_64:
 115                cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 6) <<
 116                        ISPHIST_CNT_SHIFT_SHIFT;
 117                break;
 118        default: /* OMAP3ISP_HIST_BINS_32 */
 119                cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 5) <<
 120                        ISPHIST_CNT_SHIFT_SHIFT;
 121                break;
 122        }
 123
 124        hist_reset_mem(hist);
 125
 126        isp_reg_writel(isp, cnt, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT);
 127        isp_reg_writel(isp, wb_gain,  OMAP3_ISP_IOMEM_HIST, ISPHIST_WB_GAIN);
 128        isp_reg_writel(isp, reg_hor[0], OMAP3_ISP_IOMEM_HIST, ISPHIST_R0_HORZ);
 129        isp_reg_writel(isp, reg_ver[0], OMAP3_ISP_IOMEM_HIST, ISPHIST_R0_VERT);
 130        isp_reg_writel(isp, reg_hor[1], OMAP3_ISP_IOMEM_HIST, ISPHIST_R1_HORZ);
 131        isp_reg_writel(isp, reg_ver[1], OMAP3_ISP_IOMEM_HIST, ISPHIST_R1_VERT);
 132        isp_reg_writel(isp, reg_hor[2], OMAP3_ISP_IOMEM_HIST, ISPHIST_R2_HORZ);
 133        isp_reg_writel(isp, reg_ver[2], OMAP3_ISP_IOMEM_HIST, ISPHIST_R2_VERT);
 134        isp_reg_writel(isp, reg_hor[3], OMAP3_ISP_IOMEM_HIST, ISPHIST_R3_HORZ);
 135        isp_reg_writel(isp, reg_ver[3], OMAP3_ISP_IOMEM_HIST, ISPHIST_R3_VERT);
 136
 137        hist->update = 0;
 138        hist->config_counter += hist->inc_config;
 139        hist->inc_config = 0;
 140        hist->buf_size = conf->buf_size;
 141}
 142
 143static void hist_enable(struct ispstat *hist, int enable)
 144{
 145        if (enable) {
 146                isp_reg_set(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR,
 147                            ISPHIST_PCR_ENABLE);
 148                omap3isp_subclk_enable(hist->isp, OMAP3_ISP_SUBCLK_HIST);
 149        } else {
 150                isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR,
 151                            ISPHIST_PCR_ENABLE);
 152                omap3isp_subclk_disable(hist->isp, OMAP3_ISP_SUBCLK_HIST);
 153        }
 154}
 155
 156static int hist_busy(struct ispstat *hist)
 157{
 158        return isp_reg_readl(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR)
 159                                                & ISPHIST_PCR_BUSY;
 160}
 161
 162static void hist_dma_cb(void *data)
 163{
 164        struct ispstat *hist = data;
 165
 166        /* FIXME: The DMA engine API can't report transfer errors :-/ */
 167
 168        isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT,
 169                    ISPHIST_CNT_CLEAR);
 170
 171        omap3isp_stat_dma_isr(hist);
 172        if (hist->state != ISPSTAT_DISABLED)
 173                omap3isp_hist_dma_done(hist->isp);
 174}
 175
 176static int hist_buf_dma(struct ispstat *hist)
 177{
 178        dma_addr_t dma_addr = hist->active_buf->dma_addr;
 179        struct dma_async_tx_descriptor *tx;
 180        struct dma_slave_config cfg;
 181        dma_cookie_t cookie;
 182        int ret;
 183
 184        if (unlikely(!dma_addr)) {
 185                dev_dbg(hist->isp->dev, "hist: invalid DMA buffer address\n");
 186                goto error;
 187        }
 188
 189        isp_reg_writel(hist->isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR);
 190        isp_reg_set(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT,
 191                    ISPHIST_CNT_CLEAR);
 192        omap3isp_flush(hist->isp);
 193
 194        memset(&cfg, 0, sizeof(cfg));
 195        cfg.src_addr = hist->isp->mmio_hist_base_phys + ISPHIST_DATA;
 196        cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 197        cfg.src_maxburst = hist->buf_size / 4;
 198
 199        ret = dmaengine_slave_config(hist->dma_ch, &cfg);
 200        if (ret < 0) {
 201                dev_dbg(hist->isp->dev,
 202                        "hist: DMA slave configuration failed\n");
 203                goto error;
 204        }
 205
 206        tx = dmaengine_prep_slave_single(hist->dma_ch, dma_addr,
 207                                         hist->buf_size, DMA_DEV_TO_MEM,
 208                                         DMA_CTRL_ACK);
 209        if (tx == NULL) {
 210                dev_dbg(hist->isp->dev,
 211                        "hist: DMA slave preparation failed\n");
 212                goto error;
 213        }
 214
 215        tx->callback = hist_dma_cb;
 216        tx->callback_param = hist;
 217        cookie = tx->tx_submit(tx);
 218        if (dma_submit_error(cookie)) {
 219                dev_dbg(hist->isp->dev, "hist: DMA submission failed\n");
 220                goto error;
 221        }
 222
 223        dma_async_issue_pending(hist->dma_ch);
 224
 225        return STAT_BUF_WAITING_DMA;
 226
 227error:
 228        hist_reset_mem(hist);
 229        return STAT_NO_BUF;
 230}
 231
 232static int hist_buf_pio(struct ispstat *hist)
 233{
 234        struct isp_device *isp = hist->isp;
 235        u32 *buf = hist->active_buf->virt_addr;
 236        unsigned int i;
 237
 238        if (!buf) {
 239                dev_dbg(isp->dev, "hist: invalid PIO buffer address\n");
 240                hist_reset_mem(hist);
 241                return STAT_NO_BUF;
 242        }
 243
 244        isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR);
 245
 246        /*
 247         * By setting it, the histogram internal buffer is being cleared at the
 248         * same time it's being read. This bit must be cleared just after all
 249         * data is acquired.
 250         */
 251        isp_reg_set(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR);
 252
 253        /*
 254         * We'll read 4 times a 4-bytes-word at each iteration for
 255         * optimization. It avoids 3/4 of the jumps. We also know buf_size is
 256         * divisible by 16.
 257         */
 258        for (i = hist->buf_size / 16; i > 0; i--) {
 259                *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
 260                *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
 261                *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
 262                *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA);
 263        }
 264        isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT,
 265                    ISPHIST_CNT_CLEAR);
 266
 267        return STAT_BUF_DONE;
 268}
 269
 270/*
 271 * hist_buf_process - Callback from ISP driver for HIST interrupt.
 272 */
 273static int hist_buf_process(struct ispstat *hist)
 274{
 275        struct omap3isp_hist_config *user_cfg = hist->priv;
 276        int ret;
 277
 278        if (atomic_read(&hist->buf_err) || hist->state != ISPSTAT_ENABLED) {
 279                hist_reset_mem(hist);
 280                return STAT_NO_BUF;
 281        }
 282
 283        if (--(hist->wait_acc_frames))
 284                return STAT_NO_BUF;
 285
 286        if (hist->dma_ch)
 287                ret = hist_buf_dma(hist);
 288        else
 289                ret = hist_buf_pio(hist);
 290
 291        hist->wait_acc_frames = user_cfg->num_acc_frames;
 292
 293        return ret;
 294}
 295
 296static u32 hist_get_buf_size(struct omap3isp_hist_config *conf)
 297{
 298        return OMAP3ISP_HIST_MEM_SIZE_BINS(conf->hist_bins) * conf->num_regions;
 299}
 300
 301/*
 302 * hist_validate_params - Helper function to check user given params.
 303 * @new_conf: Pointer to user configuration structure.
 304 *
 305 * Returns 0 on success configuration.
 306 */
 307static int hist_validate_params(struct ispstat *hist, void *new_conf)
 308{
 309        struct omap3isp_hist_config *user_cfg = new_conf;
 310        int c;
 311        u32 buf_size;
 312
 313        if (user_cfg->cfa > OMAP3ISP_HIST_CFA_FOVEONX3)
 314                return -EINVAL;
 315
 316        /* Regions size and position */
 317
 318        if ((user_cfg->num_regions < OMAP3ISP_HIST_MIN_REGIONS) ||
 319            (user_cfg->num_regions > OMAP3ISP_HIST_MAX_REGIONS))
 320                return -EINVAL;
 321
 322        /* Regions */
 323        for (c = 0; c < user_cfg->num_regions; c++) {
 324                if (user_cfg->region[c].h_start & ~ISPHIST_REG_START_END_MASK)
 325                        return -EINVAL;
 326                if (user_cfg->region[c].h_end & ~ISPHIST_REG_START_END_MASK)
 327                        return -EINVAL;
 328                if (user_cfg->region[c].v_start & ~ISPHIST_REG_START_END_MASK)
 329                        return -EINVAL;
 330                if (user_cfg->region[c].v_end & ~ISPHIST_REG_START_END_MASK)
 331                        return -EINVAL;
 332                if (user_cfg->region[c].h_start > user_cfg->region[c].h_end)
 333                        return -EINVAL;
 334                if (user_cfg->region[c].v_start > user_cfg->region[c].v_end)
 335                        return -EINVAL;
 336        }
 337
 338        switch (user_cfg->num_regions) {
 339        case 1:
 340                if (user_cfg->hist_bins > OMAP3ISP_HIST_BINS_256)
 341                        return -EINVAL;
 342                break;
 343        case 2:
 344                if (user_cfg->hist_bins > OMAP3ISP_HIST_BINS_128)
 345                        return -EINVAL;
 346                break;
 347        default: /* 3 or 4 */
 348                if (user_cfg->hist_bins > OMAP3ISP_HIST_BINS_64)
 349                        return -EINVAL;
 350                break;
 351        }
 352
 353        buf_size = hist_get_buf_size(user_cfg);
 354        if (buf_size > user_cfg->buf_size)
 355                /* User's buf_size request wasn't enough */
 356                user_cfg->buf_size = buf_size;
 357        else if (user_cfg->buf_size > OMAP3ISP_HIST_MAX_BUF_SIZE)
 358                user_cfg->buf_size = OMAP3ISP_HIST_MAX_BUF_SIZE;
 359
 360        return 0;
 361}
 362
 363static int hist_comp_params(struct ispstat *hist,
 364                            struct omap3isp_hist_config *user_cfg)
 365{
 366        struct omap3isp_hist_config *cur_cfg = hist->priv;
 367        int c;
 368
 369        if (cur_cfg->cfa != user_cfg->cfa)
 370                return 1;
 371
 372        if (cur_cfg->num_acc_frames != user_cfg->num_acc_frames)
 373                return 1;
 374
 375        if (cur_cfg->hist_bins != user_cfg->hist_bins)
 376                return 1;
 377
 378        for (c = 0; c < OMAP3ISP_HIST_MAX_WG; c++) {
 379                if (c == 3 && user_cfg->cfa == OMAP3ISP_HIST_CFA_FOVEONX3)
 380                        break;
 381                else if (cur_cfg->wg[c] != user_cfg->wg[c])
 382                        return 1;
 383        }
 384
 385        if (cur_cfg->num_regions != user_cfg->num_regions)
 386                return 1;
 387
 388        /* Regions */
 389        for (c = 0; c < user_cfg->num_regions; c++) {
 390                if (cur_cfg->region[c].h_start != user_cfg->region[c].h_start)
 391                        return 1;
 392                if (cur_cfg->region[c].h_end != user_cfg->region[c].h_end)
 393                        return 1;
 394                if (cur_cfg->region[c].v_start != user_cfg->region[c].v_start)
 395                        return 1;
 396                if (cur_cfg->region[c].v_end != user_cfg->region[c].v_end)
 397                        return 1;
 398        }
 399
 400        return 0;
 401}
 402
 403/*
 404 * hist_update_params - Helper function to check and store user given params.
 405 * @new_conf: Pointer to user configuration structure.
 406 */
 407static void hist_set_params(struct ispstat *hist, void *new_conf)
 408{
 409        struct omap3isp_hist_config *user_cfg = new_conf;
 410        struct omap3isp_hist_config *cur_cfg = hist->priv;
 411
 412        if (!hist->configured || hist_comp_params(hist, user_cfg)) {
 413                memcpy(cur_cfg, user_cfg, sizeof(*user_cfg));
 414                if (user_cfg->num_acc_frames == 0)
 415                        user_cfg->num_acc_frames = 1;
 416                hist->inc_config++;
 417                hist->update = 1;
 418                /*
 419                 * User might be asked for a bigger buffer than necessary for
 420                 * this configuration. In order to return the right amount of
 421                 * data during buffer request, let's calculate the size here
 422                 * instead of stick with user_cfg->buf_size.
 423                 */
 424                cur_cfg->buf_size = hist_get_buf_size(cur_cfg);
 425
 426        }
 427}
 428
 429static long hist_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
 430{
 431        struct ispstat *stat = v4l2_get_subdevdata(sd);
 432
 433        switch (cmd) {
 434        case VIDIOC_OMAP3ISP_HIST_CFG:
 435                return omap3isp_stat_config(stat, arg);
 436        case VIDIOC_OMAP3ISP_STAT_REQ:
 437                return omap3isp_stat_request_statistics(stat, arg);
 438        case VIDIOC_OMAP3ISP_STAT_EN: {
 439                int *en = arg;
 440                return omap3isp_stat_enable(stat, !!*en);
 441        }
 442        }
 443
 444        return -ENOIOCTLCMD;
 445
 446}
 447
 448static const struct ispstat_ops hist_ops = {
 449        .validate_params        = hist_validate_params,
 450        .set_params             = hist_set_params,
 451        .setup_regs             = hist_setup_regs,
 452        .enable                 = hist_enable,
 453        .busy                   = hist_busy,
 454        .buf_process            = hist_buf_process,
 455};
 456
 457static const struct v4l2_subdev_core_ops hist_subdev_core_ops = {
 458        .ioctl = hist_ioctl,
 459        .subscribe_event = omap3isp_stat_subscribe_event,
 460        .unsubscribe_event = omap3isp_stat_unsubscribe_event,
 461};
 462
 463static const struct v4l2_subdev_video_ops hist_subdev_video_ops = {
 464        .s_stream = omap3isp_stat_s_stream,
 465};
 466
 467static const struct v4l2_subdev_ops hist_subdev_ops = {
 468        .core = &hist_subdev_core_ops,
 469        .video = &hist_subdev_video_ops,
 470};
 471
 472/*
 473 * omap3isp_hist_init - Module Initialization.
 474 */
 475int omap3isp_hist_init(struct isp_device *isp)
 476{
 477        struct ispstat *hist = &isp->isp_hist;
 478        struct omap3isp_hist_config *hist_cfg;
 479        int ret = -1;
 480
 481        hist_cfg = devm_kzalloc(isp->dev, sizeof(*hist_cfg), GFP_KERNEL);
 482        if (hist_cfg == NULL)
 483                return -ENOMEM;
 484
 485        hist->isp = isp;
 486
 487        if (HIST_CONFIG_DMA) {
 488                dma_cap_mask_t mask;
 489
 490                /*
 491                 * We need slave capable channel without DMA request line for
 492                 * reading out the data.
 493                 * For this we can use dma_request_chan_by_mask() as we are
 494                 * happy with any channel as long as it is capable of slave
 495                 * configuration.
 496                 */
 497                dma_cap_zero(mask);
 498                dma_cap_set(DMA_SLAVE, mask);
 499                hist->dma_ch = dma_request_chan_by_mask(&mask);
 500                if (IS_ERR(hist->dma_ch)) {
 501                        ret = PTR_ERR(hist->dma_ch);
 502                        if (ret == -EPROBE_DEFER)
 503                                return ret;
 504
 505                        hist->dma_ch = NULL;
 506                        dev_warn(isp->dev,
 507                                 "hist: DMA channel request failed, using PIO\n");
 508                } else {
 509                        dev_dbg(isp->dev, "hist: using DMA channel %s\n",
 510                                dma_chan_name(hist->dma_ch));
 511                }
 512        }
 513
 514        hist->ops = &hist_ops;
 515        hist->priv = hist_cfg;
 516        hist->event_type = V4L2_EVENT_OMAP3ISP_HIST;
 517
 518        ret = omap3isp_stat_init(hist, "histogram", &hist_subdev_ops);
 519        if (ret) {
 520                if (hist->dma_ch)
 521                        dma_release_channel(hist->dma_ch);
 522        }
 523
 524        return ret;
 525}
 526
 527/*
 528 * omap3isp_hist_cleanup - Module cleanup.
 529 */
 530void omap3isp_hist_cleanup(struct isp_device *isp)
 531{
 532        struct ispstat *hist = &isp->isp_hist;
 533
 534        if (hist->dma_ch)
 535                dma_release_channel(hist->dma_ch);
 536
 537        omap3isp_stat_cleanup(hist);
 538}
 539