1 files changed, 520 insertions, 0 deletions

diff --git a/drivers/media/video/omap3isp/isphist.c b/drivers/media/video/omap3isp/isphist.c
new file mode 100644
index 000000000000..1743856b30d1
--- /dev/null
+++ b/drivers/media/video/omap3isp/isphist.c
@@ -0,0 +1,520 @@
+/*
+ * isphist.c
+ *
+ * TI OMAP3 ISP - Histogram module
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ * Copyright (C) 2009 Texas Instruments, Inc.
+ *
+ * Contacts: David Cohen <dacohen@gmail.com>
+ *           Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *           Sakari Ailus <sakari.ailus@iki.fi>
+ *
+ * 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 <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/device.h>
+
+#include "isp.h"
+#include "ispreg.h"
+#include "isphist.h"
+
+#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);
+                isp_reg_set(hist->isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL,
+                            ISPCTRL_HIST_CLK_EN);
+        } else {
+                isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_HIST, ISPHIST_PCR,
+                            ISPHIST_PCR_ENABLE);
+                isp_reg_clr(hist->isp, OMAP3_ISP_IOMEM_MAIN, ISP_CTRL,
+                            ISPCTRL_HIST_CLK_EN);
+        }
+}
+
+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_free(&isp->isp_hist);
+}