/* * isphist.c * * TI OMAP3 ISP - Histogram module * * Copyright (C) 2010 Nokia Corporation * Copyright (C) 2009 Texas Instruments, Inc. * * Contacts: David Cohen * Laurent Pinchart * Sakari Ailus * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA */ #include #include #include #include #include "isp.h" #include "ispreg.h" #include "isphist.h" #define OMAP24XX_DMA_NO_DEVICE 0 #define HIST_CONFIG_DMA 1 #define HIST_USING_DMA(hist) ((hist)->dma_ch >= 0) /* * hist_reset_mem - clear Histogram memory before start stats engine. */ static void hist_reset_mem(struct ispstat *hist) { struct isp_device *isp = hist->isp; struct omap3isp_hist_config *conf = hist->priv; unsigned int i; isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR); /* * By setting it, the histogram internal buffer is being cleared at the * same time it's being read. This bit must be cleared afterwards. */ isp_reg_set(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR); /* * We'll clear 4 words at each iteration for optimization. It avoids * 3/4 of the jumps. We also know HIST_MEM_SIZE is divisible by 4. */ for (i = OMAP3ISP_HIST_MEM_SIZE / 4; i > 0; i--) { isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA); isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA); isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA); isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA); } isp_reg_clr(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR); hist->wait_acc_frames = conf->num_acc_frames; } static void hist_dma_config(struct ispstat *hist) { hist->dma_config.data_type = OMAP_DMA_DATA_TYPE_S32; hist->dma_config.sync_mode = OMAP_DMA_SYNC_ELEMENT; hist->dma_config.frame_count = 1; hist->dma_config.src_amode = OMAP_DMA_AMODE_CONSTANT; hist->dma_config.src_start = OMAP3ISP_HIST_REG_BASE + ISPHIST_DATA; hist->dma_config.dst_amode = OMAP_DMA_AMODE_POST_INC; hist->dma_config.src_or_dst_synch = OMAP_DMA_SRC_SYNC; } /* * hist_setup_regs - Helper function to update Histogram registers. */ static void hist_setup_regs(struct ispstat *hist, void *priv) { struct isp_device *isp = hist->isp; struct omap3isp_hist_config *conf = priv; int c; u32 cnt; u32 wb_gain; u32 reg_hor[OMAP3ISP_HIST_MAX_REGIONS]; u32 reg_ver[OMAP3ISP_HIST_MAX_REGIONS]; if (!hist->update || hist->state == ISPSTAT_DISABLED || hist->state == ISPSTAT_DISABLING) return; cnt = conf->cfa << ISPHIST_CNT_CFA_SHIFT; wb_gain = conf->wg[0] << ISPHIST_WB_GAIN_WG00_SHIFT; wb_gain |= conf->wg[1] << ISPHIST_WB_GAIN_WG01_SHIFT; wb_gain |= conf->wg[2] << ISPHIST_WB_GAIN_WG02_SHIFT; if (conf->cfa == OMAP3ISP_HIST_CFA_BAYER) wb_gain |= conf->wg[3] << ISPHIST_WB_GAIN_WG03_SHIFT; /* Regions size and position */ for (c = 0; c < OMAP3ISP_HIST_MAX_REGIONS; c++) { if (c < conf->num_regions) { reg_hor[c] = conf->region[c].h_start << ISPHIST_REG_START_SHIFT; reg_hor[c] = conf->region[c].h_end << ISPHIST_REG_END_SHIFT; reg_ver[c] = conf->region[c].v_start << ISPHIST_REG_START_SHIFT; reg_ver[c] = conf->region[c].v_end << ISPHIST_REG_END_SHIFT; } else { reg_hor[c] = 0; reg_ver[c] = 0; } } cnt |= conf->hist_bins << ISPHIST_CNT_BINS_SHIFT; switch (conf->hist_bins) { case OMAP3ISP_HIST_BINS_256: cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 8) << ISPHIST_CNT_SHIFT_SHIFT; break; case OMAP3ISP_HIST_BINS_128: cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 7) << ISPHIST_CNT_SHIFT_SHIFT; break; case OMAP3ISP_HIST_BINS_64: cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 6) << ISPHIST_CNT_SHIFT_SHIFT; break; default: /* OMAP3ISP_HIST_BINS_32 */ cnt |= (ISPHIST_IN_BIT_WIDTH_CCDC - 5) << ISPHIST_CNT_SHIFT_SHIFT; break; } hist_reset_mem(hist); isp_reg_writel(isp, cnt, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT); isp_reg_writel(isp, wb_gain, OMAP3_ISP_IOMEM_HIST, ISPHIST_WB_GAIN); isp_reg_writel(isp, reg_hor[0], OMAP3_ISP_IOMEM_HIST, ISPHIST_R0_HORZ); isp_reg_writel(isp, reg_ver[0], OMAP3_ISP_IOMEM_HIST, ISPHIST_R0_VERT); isp_reg_writel(isp, reg_hor[1], OMAP3_ISP_IOMEM_HIST, ISPHIST_R1_HORZ); isp_reg_writel(isp, reg_ver[1], OMAP3_ISP_IOMEM_HIST, ISPHIST_R1_VERT); isp_reg_writel(isp, reg_hor[2], OMAP3_ISP_IOMEM_HIST, ISPHIST_R2_HORZ); isp_reg_writel(isp, reg_ver[2], OMAP3_ISP_IOMEM_HIST, ISPHIST_R2_VERT); isp_reg_writel(isp, reg_hor[3], OMAP3_ISP_IOMEM_HIST, ISPHIST_R3_HORZ); isp_reg_writel(isp, reg_ver[3], OMAP3_ISP_IOMEM_HIST, ISPHIST_R3_VERT); hist->update = 0; hist->config_counter += hist->inc_config; hist->inc_config = 0; hist->buf_size = conf->buf_size; } static void hist_enable(struct ispstat *hist, int enable) { if (enable) { isp_reg_set(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR, ISPHIST_PCR_ENABLE); omap3isp_subclk_enable(hist->isp, OMAP3_ISP_SUBCLK_HIST); } else { isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR, ISPHIST_PCR_ENABLE); omap3isp_subclk_disable(hist->isp, OMAP3_ISP_SUBCLK_HIST); } } static int hist_busy(struct ispstat *hist) { return isp_reg_readl(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR) & ISPHIST_PCR_BUSY; } static void hist_dma_cb(int lch, u16 ch_status, void *data) { struct ispstat *hist = data; if (ch_status & ~OMAP_DMA_BLOCK_IRQ) { dev_dbg(hist->isp->dev, "hist: DMA error. status = 0x%04x\n", ch_status); omap_stop_dma(lch); hist_reset_mem(hist); atomic_set(&hist->buf_err, 1); } isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR); omap3isp_stat_dma_isr(hist); if (hist->state != ISPSTAT_DISABLED) omap3isp_hist_dma_done(hist->isp); } static int hist_buf_dma(struct ispstat *hist) { dma_addr_t dma_addr = hist->active_buf->dma_addr; if (unlikely(!dma_addr)) { dev_dbg(hist->isp->dev, "hist: invalid DMA buffer address\n"); hist_reset_mem(hist); return STAT_NO_BUF; } isp_reg_writel(hist->isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR); isp_reg_set(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR); omap3isp_flush(hist->isp); hist->dma_config.dst_start = dma_addr; hist->dma_config.elem_count = hist->buf_size / sizeof(u32); omap_set_dma_params(hist->dma_ch, &hist->dma_config); omap_start_dma(hist->dma_ch); return STAT_BUF_WAITING_DMA; } static int hist_buf_pio(struct ispstat *hist) { struct isp_device *isp = hist->isp; u32 *buf = hist->active_buf->virt_addr; unsigned int i; if (!buf) { dev_dbg(isp->dev, "hist: invalid PIO buffer address\n"); hist_reset_mem(hist); return STAT_NO_BUF; } isp_reg_writel(isp, 0, OMAP3_ISP_IOMEM_HIST, ISPHIST_ADDR); /* * By setting it, the histogram internal buffer is being cleared at the * same time it's being read. This bit must be cleared just after all * data is acquired. */ isp_reg_set(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR); /* * We'll read 4 times a 4-bytes-word at each iteration for * optimization. It avoids 3/4 of the jumps. We also know buf_size is * divisible by 16. */ for (i = hist->buf_size / 16; i > 0; i--) { *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA); *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA); *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA); *buf++ = isp_reg_readl(isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_DATA); } isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_CNT, ISPHIST_CNT_CLEAR); return STAT_BUF_DONE; } /* * hist_buf_process - Callback from ISP driver for HIST interrupt. */ static int hist_buf_process(struct ispstat *hist) { struct omap3isp_hist_config *user_cfg = hist->priv; int ret; if (atomic_read(&hist->buf_err) || hist->state != ISPSTAT_ENABLED) { hist_reset_mem(hist); return STAT_NO_BUF; } if (--(hist->wait_acc_frames)) return STAT_NO_BUF; if (HIST_USING_DMA(hist)) ret = hist_buf_dma(hist); else ret = hist_buf_pio(hist); hist->wait_acc_frames = user_cfg->num_acc_frames; return ret; } static u32 hist_get_buf_size(struct omap3isp_hist_config *conf) { return OMAP3ISP_HIST_MEM_SIZE_BINS(conf->hist_bins) * conf->num_regions; } /* * hist_validate_params - Helper function to check user given params. * @user_cfg: Pointer to user configuration structure. * * Returns 0 on success configuration. */ static int hist_validate_params(struct ispstat *hist, void *new_conf) { struct omap3isp_hist_config *user_cfg = new_conf; int c; u32 buf_size; if (user_cfg->cfa > OMAP3ISP_HIST_CFA_FOVEONX3) return -EINVAL; /* Regions size and position */ if ((user_cfg->num_regions < OMAP3ISP_HIST_MIN_REGIONS) || (user_cfg->num_regions > OMAP3ISP_HIST_MAX_REGIONS)) return -EINVAL; /* Regions */ for (c = 0; c < user_cfg->num_regions; c++) { if (user_cfg->region[c].h_start & ~ISPHIST_REG_START_END_MASK) return -EINVAL; if (user_cfg->region[c].h_end & ~ISPHIST_REG_START_END_MASK) return -EINVAL; if (user_cfg->region[c].v_start & ~ISPHIST_REG_START_END_MASK) return -EINVAL; if (user_cfg->region[c].v_end & ~ISPHIST_REG_START_END_MASK) return -EINVAL; if (user_cfg->region[c].h_start > user_cfg->region[c].h_end) return -EINVAL; if (user_cfg->region[c].v_start > user_cfg->region[c].v_end) return -EINVAL; } switch (user_cfg->num_regions) { case 1: if (user_cfg->hist_bins > OMAP3ISP_HIST_BINS_256) return -EINVAL; break; case 2: if (user_cfg->hist_bins > OMAP3ISP_HIST_BINS_128) return -EINVAL; break; default: /* 3 or 4 */ if (user_cfg->hist_bins > OMAP3ISP_HIST_BINS_64) return -EINVAL; break; } buf_size = hist_get_buf_size(user_cfg); if (buf_size > user_cfg->buf_size) /* User's buf_size request wasn't enoght */ user_cfg->buf_size = buf_size; else if (user_cfg->buf_size > OMAP3ISP_HIST_MAX_BUF_SIZE) user_cfg->buf_size = OMAP3ISP_HIST_MAX_BUF_SIZE; return 0; } static int hist_comp_params(struct ispstat *hist, struct omap3isp_hist_config *user_cfg) { struct omap3isp_hist_config *cur_cfg = hist->priv; int c; if (cur_cfg->cfa != user_cfg->cfa) return 1; if (cur_cfg->num_acc_frames != user_cfg->num_acc_frames) return 1; if (cur_cfg->hist_bins != user_cfg->hist_bins) return 1; for (c = 0; c < OMAP3ISP_HIST_MAX_WG; c++) { if (c == 3 && user_cfg->cfa == OMAP3ISP_HIST_CFA_FOVEONX3) break; else if (cur_cfg->wg[c] != user_cfg->wg[c]) return 1; } if (cur_cfg->num_regions != user_cfg->num_regions) return 1; /* Regions */ for (c = 0; c < user_cfg->num_regions; c++) { if (cur_cfg->region[c].h_start != user_cfg->region[c].h_start) return 1; if (cur_cfg->region[c].h_end != user_cfg->region[c].h_end) return 1; if (cur_cfg->region[c].v_start != user_cfg->region[c].v_start) return 1; if (cur_cfg->region[c].v_end != user_cfg->region[c].v_end) return 1; } return 0; } /* * hist_update_params - Helper function to check and store user given params. * @new_conf: Pointer to user configuration structure. */ static void hist_set_params(struct ispstat *hist, void *new_conf) { struct omap3isp_hist_config *user_cfg = new_conf; struct omap3isp_hist_config *cur_cfg = hist->priv; if (!hist->configured || hist_comp_params(hist, user_cfg)) { memcpy(cur_cfg, user_cfg, sizeof(*user_cfg)); if (user_cfg->num_acc_frames == 0) user_cfg->num_acc_frames = 1; hist->inc_config++; hist->update = 1; /* * User might be asked for a bigger buffer than necessary for * this configuration. In order to return the right amount of * data during buffer request, let's calculate the size here * instead of stick with user_cfg->buf_size. */ cur_cfg->buf_size = hist_get_buf_size(cur_cfg); } } static long hist_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg) { struct ispstat *stat = v4l2_get_subdevdata(sd); switch (cmd) { case VIDIOC_OMAP3ISP_HIST_CFG: return omap3isp_stat_config(stat, arg); case VIDIOC_OMAP3ISP_STAT_REQ: return omap3isp_stat_request_statistics(stat, arg); case VIDIOC_OMAP3ISP_STAT_EN: { int *en = arg; return omap3isp_stat_enable(stat, !!*en); } } return -ENOIOCTLCMD; } static const struct ispstat_ops hist_ops = { .validate_params = hist_validate_params, .set_params = hist_set_params, .setup_regs = hist_setup_regs, .enable = hist_enable, .busy = hist_busy, .buf_process = hist_buf_process, }; static const struct v4l2_subdev_core_ops hist_subdev_core_ops = { .ioctl = hist_ioctl, .subscribe_event = omap3isp_stat_subscribe_event, .unsubscribe_event = omap3isp_stat_unsubscribe_event, }; static const struct v4l2_subdev_video_ops hist_subdev_video_ops = { .s_stream = omap3isp_stat_s_stream, }; static const struct v4l2_subdev_ops hist_subdev_ops = { .core = &hist_subdev_core_ops, .video = &hist_subdev_video_ops, }; /* * omap3isp_hist_init - Module Initialization. */ int omap3isp_hist_init(struct isp_device *isp) { struct ispstat *hist = &isp->isp_hist; struct omap3isp_hist_config *hist_cfg; int ret = -1; hist_cfg = kzalloc(sizeof(*hist_cfg), GFP_KERNEL); if (hist_cfg == NULL) return -ENOMEM; memset(hist, 0, sizeof(*hist)); if (HIST_CONFIG_DMA) ret = omap_request_dma(OMAP24XX_DMA_NO_DEVICE, "DMA_ISP_HIST", hist_dma_cb, hist, &hist->dma_ch); if (ret) { if (HIST_CONFIG_DMA) dev_warn(isp->dev, "hist: DMA request channel failed. " "Using PIO only.\n"); hist->dma_ch = -1; } else { dev_dbg(isp->dev, "hist: DMA channel = %d\n", hist->dma_ch); hist_dma_config(hist); omap_enable_dma_irq(hist->dma_ch, OMAP_DMA_BLOCK_IRQ); } hist->ops = &hist_ops; hist->priv = hist_cfg; hist->event_type = V4L2_EVENT_OMAP3ISP_HIST; hist->isp = isp; ret = omap3isp_stat_init(hist, "histogram", &hist_subdev_ops); if (ret) { kfree(hist_cfg); if (HIST_USING_DMA(hist)) omap_free_dma(hist->dma_ch); } return ret; } /* * omap3isp_hist_cleanup - Module cleanup. */ void omap3isp_hist_cleanup(struct isp_device *isp) { if (HIST_USING_DMA(&isp->isp_hist)) omap_free_dma(isp->isp_hist.dma_ch); kfree(isp->isp_hist.priv); omap3isp_stat_cleanup(&isp->isp_hist); }