--- /dev/null
+/*
+ * 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.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/omap-dmaengine.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include "isp.h"
+#include "ispreg.h"
+#include "isphist.h"
+
+#define HIST_CONFIG_DMA 1
+
+/*
+ * 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;
+}
+
+/*
+ * 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)
+ | (conf->region[c].h_end <<
+ ISPHIST_REG_END_SHIFT);
+ reg_ver[c] = (conf->region[c].v_start <<
+ ISPHIST_REG_START_SHIFT)
+ | (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(void *data)
+{
+ struct ispstat *hist = data;
+
+ /* FIXME: The DMA engine API can't report transfer errors :-/ */
+
+ 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;
+ struct dma_async_tx_descriptor *tx;
+ struct dma_slave_config cfg;
+ dma_cookie_t cookie;
+ int ret;
+
+ if (unlikely(!dma_addr)) {
+ dev_dbg(hist->isp->dev, "hist: invalid DMA buffer address\n");
+ goto error;
+ }
+
+ 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);
+
+ memset(&cfg, 0, sizeof(cfg));
+ cfg.src_addr = hist->isp->mmio_hist_base_phys + ISPHIST_DATA;
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ cfg.src_maxburst = hist->buf_size / 4;
+
+ ret = dmaengine_slave_config(hist->dma_ch, &cfg);
+ if (ret < 0) {
+ dev_dbg(hist->isp->dev,
+ "hist: DMA slave configuration failed\n");
+ goto error;
+ }
+
+ tx = dmaengine_prep_slave_single(hist->dma_ch, dma_addr,
+ hist->buf_size, DMA_DEV_TO_MEM,
+ DMA_CTRL_ACK);
+ if (tx == NULL) {
+ dev_dbg(hist->isp->dev,
+ "hist: DMA slave preparation failed\n");
+ goto error;
+ }
+
+ tx->callback = hist_dma_cb;
+ tx->callback_param = hist;
+ cookie = tx->tx_submit(tx);
+ if (dma_submit_error(cookie)) {
+ dev_dbg(hist->isp->dev, "hist: DMA submission failed\n");
+ goto error;
+ }
+
+ dma_async_issue_pending(hist->dma_ch);
+
+ return STAT_BUF_WAITING_DMA;
+
+error:
+ hist_reset_mem(hist);
+ return STAT_NO_BUF;
+}
+
+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->dma_ch)
+ 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.
+ * @new_conf: 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 enough */
+ 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 = devm_kzalloc(isp->dev, sizeof(*hist_cfg), GFP_KERNEL);
+ if (hist_cfg == NULL)
+ return -ENOMEM;
+
+ hist->isp = isp;
+
+ if (HIST_CONFIG_DMA) {
+ struct platform_device *pdev = to_platform_device(isp->dev);
+ struct resource *res;
+ unsigned int sig = 0;
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
+ "hist");
+ if (res)
+ sig = res->start;
+
+ hist->dma_ch = dma_request_slave_channel_compat(mask,
+ omap_dma_filter_fn, &sig, isp->dev, "hist");
+ if (!hist->dma_ch)
+ dev_warn(isp->dev,
+ "hist: DMA channel request failed, using PIO\n");
+ else
+ dev_dbg(isp->dev, "hist: using DMA channel %s\n",
+ dma_chan_name(hist->dma_ch));
+ }
+
+ hist->ops = &hist_ops;
+ hist->priv = hist_cfg;
+ hist->event_type = V4L2_EVENT_OMAP3ISP_HIST;
+
+ ret = omap3isp_stat_init(hist, "histogram", &hist_subdev_ops);
+ if (ret) {
+ if (hist->dma_ch)
+ dma_release_channel(hist->dma_ch);
+ }
+
+ return ret;
+}
+
+/*
+ * omap3isp_hist_cleanup - Module cleanup.
+ */
+void omap3isp_hist_cleanup(struct isp_device *isp)
+{
+ struct ispstat *hist = &isp->isp_hist;
+
+ if (hist->dma_ch)
+ dma_release_channel(hist->dma_ch);
+
+ omap3isp_stat_cleanup(hist);
+}
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