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