// SPDX-License-Identifier: GPL-2.0+
/*
 * vsp1_wpf.c  --  R-Car VSP1 Write Pixel Formatter
 *
 * Copyright (C) 2013-2014 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

#include <linux/device.h>

#include <media/v4l2-subdev.h>

#include "vsp1.h"
#include "vsp1_dl.h"
#include "vsp1_pipe.h"
#include "vsp1_rwpf.h"
#include "vsp1_video.h"

#define WPF_GEN2_MAX_WIDTH                      2048U
#define WPF_GEN2_MAX_HEIGHT                     2048U
#define WPF_GEN3_MAX_WIDTH                      8190U
#define WPF_GEN3_MAX_HEIGHT                     8190U

/* -----------------------------------------------------------------------------
 * Device Access
 */

static inline void vsp1_wpf_write(struct vsp1_rwpf *wpf,
                                  struct vsp1_dl_body *dlb, u32 reg, u32 data)
{
        vsp1_dl_body_write(dlb, reg + wpf->entity.index * VI6_WPF_OFFSET, data);
}

/* -----------------------------------------------------------------------------
 * Controls
 */

enum wpf_flip_ctrl {
        WPF_CTRL_VFLIP = 0,
        WPF_CTRL_HFLIP = 1,
};

static int vsp1_wpf_set_rotation(struct vsp1_rwpf *wpf, unsigned int rotation)
{
        struct vsp1_video *video = wpf->video;
        struct v4l2_mbus_framefmt *sink_format;
        struct v4l2_mbus_framefmt *source_format;
        bool rotate;
        int ret = 0;

        /*
         * Only consider the 0°/180° from/to 90°/270° modifications, the rest
         * is taken care of by the flipping configuration.
         */
        rotate = rotation == 90 || rotation == 270;
        if (rotate == wpf->flip.rotate)
                return 0;

        /* Changing rotation isn't allowed when buffers are allocated. */
        mutex_lock(&video->lock);

        if (vb2_is_busy(&video->queue)) {
                ret = -EBUSY;
                goto done;
        }

        sink_format = vsp1_entity_get_pad_format(&wpf->entity,
                                                 wpf->entity.config,
                                                 RWPF_PAD_SINK);
        source_format = vsp1_entity_get_pad_format(&wpf->entity,
                                                   wpf->entity.config,
                                                   RWPF_PAD_SOURCE);

        mutex_lock(&wpf->entity.lock);

        if (rotate) {
                source_format->width = sink_format->height;
                source_format->height = sink_format->width;
        } else {
                source_format->width = sink_format->width;
                source_format->height = sink_format->height;
        }

        wpf->flip.rotate = rotate;

        mutex_unlock(&wpf->entity.lock);

done:
        mutex_unlock(&video->lock);
        return ret;
}

static int vsp1_wpf_s_ctrl(struct v4l2_ctrl *ctrl)
{
        struct vsp1_rwpf *wpf =
                container_of(ctrl->handler, struct vsp1_rwpf, ctrls);
        unsigned int rotation;
        u32 flip = 0;
        int ret;

        /* Update the rotation. */
        rotation = wpf->flip.ctrls.rotate ? wpf->flip.ctrls.rotate->val : 0;
        ret = vsp1_wpf_set_rotation(wpf, rotation);
        if (ret < 0)
                return ret;

        /*
         * Compute the flip value resulting from all three controls, with
         * rotation by 180° flipping the image in both directions. Store the
         * result in the pending flip field for the next frame that will be
         * processed.
         */
        if (wpf->flip.ctrls.vflip->val)
                flip |= BIT(WPF_CTRL_VFLIP);

        if (wpf->flip.ctrls.hflip && wpf->flip.ctrls.hflip->val)
                flip |= BIT(WPF_CTRL_HFLIP);

        if (rotation == 180 || rotation == 270)
                flip ^= BIT(WPF_CTRL_VFLIP) | BIT(WPF_CTRL_HFLIP);

        spin_lock_irq(&wpf->flip.lock);
        wpf->flip.pending = flip;
        spin_unlock_irq(&wpf->flip.lock);

        return 0;
}

static const struct v4l2_ctrl_ops vsp1_wpf_ctrl_ops = {
        .s_ctrl = vsp1_wpf_s_ctrl,
};

static int wpf_init_controls(struct vsp1_rwpf *wpf)
{
        struct vsp1_device *vsp1 = wpf->entity.vsp1;
        unsigned int num_flip_ctrls;

        spin_lock_init(&wpf->flip.lock);

        if (wpf->entity.index != 0) {
                /* Only WPF0 supports flipping. */
                num_flip_ctrls = 0;
        } else if (vsp1_feature(vsp1, VSP1_HAS_WPF_HFLIP)) {
                /*
                 * When horizontal flip is supported the WPF implements three
                 * controls (horizontal flip, vertical flip and rotation).
                 */
                num_flip_ctrls = 3;
        } else if (vsp1_feature(vsp1, VSP1_HAS_WPF_VFLIP)) {
                /*
                 * When only vertical flip is supported the WPF implements a
                 * single control (vertical flip).
                 */
                num_flip_ctrls = 1;
        } else {
                /* Otherwise flipping is not supported. */
                num_flip_ctrls = 0;
        }

        vsp1_rwpf_init_ctrls(wpf, num_flip_ctrls);

        if (num_flip_ctrls >= 1) {
                wpf->flip.ctrls.vflip =
                        v4l2_ctrl_new_std(&wpf->ctrls, &vsp1_wpf_ctrl_ops,
                                          V4L2_CID_VFLIP, 0, 1, 1, 0);
        }

        if (num_flip_ctrls == 3) {
                wpf->flip.ctrls.hflip =
                        v4l2_ctrl_new_std(&wpf->ctrls, &vsp1_wpf_ctrl_ops,
                                          V4L2_CID_HFLIP, 0, 1, 1, 0);
                wpf->flip.ctrls.rotate =
                        v4l2_ctrl_new_std(&wpf->ctrls, &vsp1_wpf_ctrl_ops,
                                          V4L2_CID_ROTATE, 0, 270, 90, 0);
                v4l2_ctrl_cluster(3, &wpf->flip.ctrls.vflip);
        }

        if (wpf->ctrls.error) {
                dev_err(vsp1->dev, "wpf%u: failed to initialize controls\n",
                        wpf->entity.index);
                return wpf->ctrls.error;
        }

        return 0;
}

/* -----------------------------------------------------------------------------
 * V4L2 Subdevice Core Operations
 */

static int wpf_s_stream(struct v4l2_subdev *subdev, int enable)
{
        struct vsp1_rwpf *wpf = to_rwpf(subdev);
        struct vsp1_device *vsp1 = wpf->entity.vsp1;

        if (enable)
                return 0;

        /*
         * Write to registers directly when stopping the stream as there will be
         * no pipeline run to apply the display list.
         */
        vsp1_write(vsp1, VI6_WPF_IRQ_ENB(wpf->entity.index), 0);
        vsp1_write(vsp1, wpf->entity.index * VI6_WPF_OFFSET +
                   VI6_WPF_SRCRPF, 0);

        return 0;
}

/* -----------------------------------------------------------------------------
 * V4L2 Subdevice Operations
 */

static const struct v4l2_subdev_video_ops wpf_video_ops = {
        .s_stream = wpf_s_stream,
};

static const struct v4l2_subdev_ops wpf_ops = {
        .video  = &wpf_video_ops,
        .pad    = &vsp1_rwpf_pad_ops,
};

/* -----------------------------------------------------------------------------
 * VSP1 Entity Operations
 */

static void vsp1_wpf_destroy(struct vsp1_entity *entity)
{
        struct vsp1_rwpf *wpf = entity_to_rwpf(entity);

        vsp1_dlm_destroy(wpf->dlm);
}

static int wpf_configure_writeback_chain(struct vsp1_rwpf *wpf,
                                         struct vsp1_dl_list *dl)
{
        unsigned int index = wpf->entity.index;
        struct vsp1_dl_list *dl_next;
        struct vsp1_dl_body *dlb;

        dl_next = vsp1_dl_list_get(wpf->dlm);
        if (!dl_next) {
                dev_err(wpf->entity.vsp1->dev,
                        "Failed to obtain a dl list, disabling writeback\n");
                return -ENOMEM;
        }

        dlb = vsp1_dl_list_get_body0(dl_next);
        vsp1_dl_body_write(dlb, VI6_WPF_WRBCK_CTRL(index), 0);
        vsp1_dl_list_add_chain(dl, dl_next);

        return 0;
}

static void wpf_configure_stream(struct vsp1_entity *entity,
                                 struct vsp1_pipeline *pipe,
                                 struct vsp1_dl_list *dl,
                                 struct vsp1_dl_body *dlb)
{
        struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);
        struct vsp1_device *vsp1 = wpf->entity.vsp1;
        const struct v4l2_mbus_framefmt *source_format;
        const struct v4l2_mbus_framefmt *sink_format;
        unsigned int index = wpf->entity.index;
        unsigned int i;
        u32 outfmt = 0;
        u32 srcrpf = 0;
        int ret;

        sink_format = vsp1_entity_get_pad_format(&wpf->entity,
                                                 wpf->entity.config,
                                                 RWPF_PAD_SINK);
        source_format = vsp1_entity_get_pad_format(&wpf->entity,
                                                   wpf->entity.config,
                                                   RWPF_PAD_SOURCE);

        /* Format */
        if (!pipe->lif || wpf->writeback) {
                const struct v4l2_pix_format_mplane *format = &wpf->format;
                const struct vsp1_format_info *fmtinfo = wpf->fmtinfo;

                outfmt = fmtinfo->hwfmt << VI6_WPF_OUTFMT_WRFMT_SHIFT;

                if (wpf->flip.rotate)
                        outfmt |= VI6_WPF_OUTFMT_ROT;

                if (fmtinfo->alpha)
                        outfmt |= VI6_WPF_OUTFMT_PXA;
                if (fmtinfo->swap_yc)
                        outfmt |= VI6_WPF_OUTFMT_SPYCS;
                if (fmtinfo->swap_uv)
                        outfmt |= VI6_WPF_OUTFMT_SPUVS;

                /* Destination stride and byte swapping. */
                vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_STRIDE_Y,
                               format->plane_fmt[0].bytesperline);
                if (format->num_planes > 1)
                        vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_STRIDE_C,
                                       format->plane_fmt[1].bytesperline);

                vsp1_wpf_write(wpf, dlb, VI6_WPF_DSWAP, fmtinfo->swap);

                if (vsp1_feature(vsp1, VSP1_HAS_WPF_HFLIP) && index == 0)
                        vsp1_wpf_write(wpf, dlb, VI6_WPF_ROT_CTRL,
                                       VI6_WPF_ROT_CTRL_LN16 |
                                       (256 << VI6_WPF_ROT_CTRL_LMEM_WD_SHIFT));
        }

        if (sink_format->code != source_format->code)
                outfmt |= VI6_WPF_OUTFMT_CSC;

        wpf->outfmt = outfmt;

        vsp1_dl_body_write(dlb, VI6_DPR_WPF_FPORCH(index),
                           VI6_DPR_WPF_FPORCH_FP_WPFN);

        /*
         * Sources. If the pipeline has a single input and BRx is not used,
         * configure it as the master layer. Otherwise configure all
         * inputs as sub-layers and select the virtual RPF as the master
         * layer.
         */
        for (i = 0; i < vsp1->info->rpf_count; ++i) {
                struct vsp1_rwpf *input = pipe->inputs[i];

                if (!input)
                        continue;

                srcrpf |= (!pipe->brx && pipe->num_inputs == 1)
                        ? VI6_WPF_SRCRPF_RPF_ACT_MST(input->entity.index)
                        : VI6_WPF_SRCRPF_RPF_ACT_SUB(input->entity.index);
        }

        if (pipe->brx)
                srcrpf |= pipe->brx->type == VSP1_ENTITY_BRU
                        ? VI6_WPF_SRCRPF_VIRACT_MST
                        : VI6_WPF_SRCRPF_VIRACT2_MST;

        vsp1_wpf_write(wpf, dlb, VI6_WPF_SRCRPF, srcrpf);

        /* Enable interrupts. */
        vsp1_dl_body_write(dlb, VI6_WPF_IRQ_STA(index), 0);
        vsp1_dl_body_write(dlb, VI6_WPF_IRQ_ENB(index),
                           VI6_WFP_IRQ_ENB_DFEE);

        /*
         * Configure writeback for display pipelines (the wpf writeback flag is
         * never set for memory-to-memory pipelines). Start by adding a chained
         * display list to disable writeback after a single frame, and process
         * to enable writeback. If the display list allocation fails don't
         * enable writeback as we wouldn't be able to safely disable it,
         * resulting in possible memory corruption.
         */
        if (wpf->writeback) {
                ret = wpf_configure_writeback_chain(wpf, dl);
                if (ret < 0)
                        wpf->writeback = false;
        }

        vsp1_dl_body_write(dlb, VI6_WPF_WRBCK_CTRL(index),
                           wpf->writeback ? VI6_WPF_WRBCK_CTRL_WBMD : 0);
}

static void wpf_configure_frame(struct vsp1_entity *entity,
                                struct vsp1_pipeline *pipe,
                                struct vsp1_dl_list *dl,
                                struct vsp1_dl_body *dlb)
{
        const unsigned int mask = BIT(WPF_CTRL_VFLIP)
                                | BIT(WPF_CTRL_HFLIP);
        struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);
        unsigned long flags;
        u32 outfmt;

        spin_lock_irqsave(&wpf->flip.lock, flags);
        wpf->flip.active = (wpf->flip.active & ~mask)
                         | (wpf->flip.pending & mask);
        spin_unlock_irqrestore(&wpf->flip.lock, flags);

        outfmt = (wpf->alpha << VI6_WPF_OUTFMT_PDV_SHIFT) | wpf->outfmt;

        if (wpf->flip.active & BIT(WPF_CTRL_VFLIP))
                outfmt |= VI6_WPF_OUTFMT_FLP;
        if (wpf->flip.active & BIT(WPF_CTRL_HFLIP))
                outfmt |= VI6_WPF_OUTFMT_HFLP;

        vsp1_wpf_write(wpf, dlb, VI6_WPF_OUTFMT, outfmt);
}

static void wpf_configure_partition(struct vsp1_entity *entity,
                                    struct vsp1_pipeline *pipe,
                                    struct vsp1_dl_list *dl,
                                    struct vsp1_dl_body *dlb)
{
        struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);
        struct vsp1_device *vsp1 = wpf->entity.vsp1;
        struct vsp1_rwpf_memory mem = wpf->mem;
        const struct v4l2_mbus_framefmt *sink_format;
        const struct v4l2_pix_format_mplane *format = &wpf->format;
        const struct vsp1_format_info *fmtinfo = wpf->fmtinfo;
        unsigned int width;
        unsigned int height;
        unsigned int left;
        unsigned int offset;
        unsigned int flip;
        unsigned int i;

        sink_format = vsp1_entity_get_pad_format(&wpf->entity,
                                                 wpf->entity.config,
                                                 RWPF_PAD_SINK);
        width = sink_format->width;
        height = sink_format->height;
        left = 0;

        /*
         * Cropping. The partition algorithm can split the image into
         * multiple slices.
         */
        if (pipe->partitions > 1) {
                width = pipe->partition->wpf.width;
                left = pipe->partition->wpf.left;
        }

        vsp1_wpf_write(wpf, dlb, VI6_WPF_HSZCLIP, VI6_WPF_SZCLIP_EN |
                       (0 << VI6_WPF_SZCLIP_OFST_SHIFT) |
                       (width << VI6_WPF_SZCLIP_SIZE_SHIFT));
        vsp1_wpf_write(wpf, dlb, VI6_WPF_VSZCLIP, VI6_WPF_SZCLIP_EN |
                       (0 << VI6_WPF_SZCLIP_OFST_SHIFT) |
                       (height << VI6_WPF_SZCLIP_SIZE_SHIFT));

        /*
         * For display pipelines without writeback enabled there's no memory
         * address to configure, return now.
         */
        if (pipe->lif && !wpf->writeback)
                return;

        /*
         * Update the memory offsets based on flipping configuration.
         * The destination addresses point to the locations where the
         * VSP starts writing to memory, which can be any corner of the
         * image depending on the combination of flipping and rotation.
         */

        /*
         * First take the partition left coordinate into account.
         * Compute the offset to order the partitions correctly on the
         * output based on whether flipping is enabled. Consider
         * horizontal flipping when rotation is disabled but vertical
         * flipping when rotation is enabled, as rotating the image
         * switches the horizontal and vertical directions. The offset
         * is applied horizontally or vertically accordingly.
         */
        flip = wpf->flip.active;

        if (flip & BIT(WPF_CTRL_HFLIP) && !wpf->flip.rotate)
                offset = format->width - left - width;
        else if (flip & BIT(WPF_CTRL_VFLIP) && wpf->flip.rotate)
                offset = format->height - left - width;
        else
                offset = left;

        for (i = 0; i < format->num_planes; ++i) {
                unsigned int hsub = i > 0 ? fmtinfo->hsub : 1;
                unsigned int vsub = i > 0 ? fmtinfo->vsub : 1;

                if (wpf->flip.rotate)
                        mem.addr[i] += offset / vsub
                                     * format->plane_fmt[i].bytesperline;
                else
                        mem.addr[i] += offset / hsub
                                     * fmtinfo->bpp[i] / 8;
        }

        if (flip & BIT(WPF_CTRL_VFLIP)) {
                /*
                 * When rotating the output (after rotation) image
                 * height is equal to the partition width (before
                 * rotation). Otherwise it is equal to the output
                 * image height.
                 */
                if (wpf->flip.rotate)
                        height = width;
                else
                        height = format->height;

                mem.addr[0] += (height - 1)
                             * format->plane_fmt[0].bytesperline;

                if (format->num_planes > 1) {
                        offset = (height / fmtinfo->vsub - 1)
                               * format->plane_fmt[1].bytesperline;
                        mem.addr[1] += offset;
                        mem.addr[2] += offset;
                }
        }

        if (wpf->flip.rotate && !(flip & BIT(WPF_CTRL_HFLIP))) {
                unsigned int hoffset = max(0, (int)format->width - 16);

                /*
                 * Compute the output coordinate. The partition
                 * horizontal (left) offset becomes a vertical offset.
                 */
                for (i = 0; i < format->num_planes; ++i) {
                        unsigned int hsub = i > 0 ? fmtinfo->hsub : 1;

                        mem.addr[i] += hoffset / hsub
                                     * fmtinfo->bpp[i] / 8;
                }
        }

        /*
         * On Gen3 hardware the SPUVS bit has no effect on 3-planar
         * formats. Swap the U and V planes manually in that case.
         */
        if (vsp1->info->gen == 3 && format->num_planes == 3 &&
            fmtinfo->swap_uv)
                swap(mem.addr[1], mem.addr[2]);

        vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_ADDR_Y, mem.addr[0]);
        vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_ADDR_C0, mem.addr[1]);
        vsp1_wpf_write(wpf, dlb, VI6_WPF_DSTM_ADDR_C1, mem.addr[2]);

        /*
         * Writeback operates in single-shot mode and lasts for a single frame,
         * reset the writeback flag to false for the next frame.
         */
        wpf->writeback = false;
}

static unsigned int wpf_max_width(struct vsp1_entity *entity,
                                  struct vsp1_pipeline *pipe)
{
        struct vsp1_rwpf *wpf = to_rwpf(&entity->subdev);

        return wpf->flip.rotate ? 256 : wpf->max_width;
}

static void wpf_partition(struct vsp1_entity *entity,
                          struct vsp1_pipeline *pipe,
                          struct vsp1_partition *partition,
                          unsigned int partition_idx,
                          struct vsp1_partition_window *window)
{
        partition->wpf = *window;
}

static const struct vsp1_entity_operations wpf_entity_ops = {
        .destroy = vsp1_wpf_destroy,
        .configure_stream = wpf_configure_stream,
        .configure_frame = wpf_configure_frame,
        .configure_partition = wpf_configure_partition,
        .max_width = wpf_max_width,
        .partition = wpf_partition,
};

/* -----------------------------------------------------------------------------
 * Initialization and Cleanup
 */

struct vsp1_rwpf *vsp1_wpf_create(struct vsp1_device *vsp1, unsigned int index)
{
        struct vsp1_rwpf *wpf;
        char name[6];
        int ret;

        wpf = devm_kzalloc(vsp1->dev, sizeof(*wpf), GFP_KERNEL);
        if (wpf == NULL)
                return ERR_PTR(-ENOMEM);

        if (vsp1->info->gen == 2) {
                wpf->max_width = WPF_GEN2_MAX_WIDTH;
                wpf->max_height = WPF_GEN2_MAX_HEIGHT;
        } else {
                wpf->max_width = WPF_GEN3_MAX_WIDTH;
                wpf->max_height = WPF_GEN3_MAX_HEIGHT;
        }

        wpf->entity.ops = &wpf_entity_ops;
        wpf->entity.type = VSP1_ENTITY_WPF;
        wpf->entity.index = index;

        sprintf(name, "wpf.%u", index);
        ret = vsp1_entity_init(vsp1, &wpf->entity, name, 2, &wpf_ops,
                               MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
        if (ret < 0)
                return ERR_PTR(ret);

        /* Initialize the display list manager. */
        wpf->dlm = vsp1_dlm_create(vsp1, index, 64);
        if (!wpf->dlm) {
                ret = -ENOMEM;
                goto error;
        }

        /* Initialize the control handler. */
        ret = wpf_init_controls(wpf);
        if (ret < 0) {
                dev_err(vsp1->dev, "wpf%u: failed to initialize controls\n",
                        index);
                goto error;
        }

        v4l2_ctrl_handler_setup(&wpf->ctrls);

        return wpf;

error:
        vsp1_entity_destroy(&wpf->entity);
        return ERR_PTR(ret);
}