// SPDX-License-Identifier: GPL-2.0

#include <linux/module.h>
#include <linux/slab.h>
#include <media/v4l2-mem2mem.h>
#include <media/v4l2-h264.h>
#include <media/videobuf2-dma-contig.h>

#include "../mtk_vcodec_util.h"
#include "../mtk_vcodec_dec.h"
#include "../mtk_vcodec_intr.h"
#include "../vdec_drv_base.h"
#include "../vdec_drv_if.h"
#include "../vdec_vpu_if.h"
#include "vdec_h264_req_common.h"

/*
 * struct mtk_h264_dec_slice_param  - parameters for decode current frame
 */
struct mtk_h264_dec_slice_param {
	struct mtk_h264_sps_param			sps;
	struct mtk_h264_pps_param			pps;
	struct slice_api_h264_scaling_matrix		scaling_matrix;
	struct slice_api_h264_decode_param		decode_params;
	struct mtk_h264_dpb_info h264_dpb_info[16];
};

/**
 * struct vdec_h264_dec_info - decode information
 * @dpb_sz		: decoding picture buffer size
 * @resolution_changed  : resoltion change happen
 * @realloc_mv_buf	: flag to notify driver to re-allocate mv buffer
 * @cap_num_planes	: number planes of capture buffer
 * @bs_dma		: Input bit-stream buffer dma address
 * @y_fb_dma		: Y frame buffer dma address
 * @c_fb_dma		: C frame buffer dma address
 * @vdec_fb_va		: VDEC frame buffer struct virtual address
 */
struct vdec_h264_dec_info {
	u32 dpb_sz;
	u32 resolution_changed;
	u32 realloc_mv_buf;
	u32 cap_num_planes;
	u64 bs_dma;
	u64 y_fb_dma;
	u64 c_fb_dma;
	u64 vdec_fb_va;
};

/**
 * struct vdec_h264_vsi - shared memory for decode information exchange
 *                        between VPU and Host.
 *                        The memory is allocated by VPU then mapping to Host
 *                        in vpu_dec_init() and freed in vpu_dec_deinit()
 *                        by VPU.
 *                        AP-W/R : AP is writer/reader on this item
 *                        VPU-W/R: VPU is write/reader on this item
 * @pred_buf_dma : HW working predication buffer dma address (AP-W, VPU-R)
 * @mv_buf_dma   : HW working motion vector buffer dma address (AP-W, VPU-R)
 * @dec          : decode information (AP-R, VPU-W)
 * @pic          : picture information (AP-R, VPU-W)
 * @crop         : crop information (AP-R, VPU-W)
 * @h264_slice_params : the parameters that hardware use to decode
 */
struct vdec_h264_vsi {
	u64 pred_buf_dma;
	u64 mv_buf_dma[H264_MAX_MV_NUM];
	struct vdec_h264_dec_info dec;
	struct vdec_pic_info pic;
	struct v4l2_rect crop;
	struct mtk_h264_dec_slice_param h264_slice_params;
};

/**
 * struct vdec_h264_slice_inst - h264 decoder instance
 * @num_nalu : how many nalus be decoded
 * @ctx      : point to mtk_vcodec_ctx
 * @pred_buf : HW working predication buffer
 * @mv_buf   : HW working motion vector buffer
 * @vpu      : VPU instance
 * @vsi_ctx  : Local VSI data for this decoding context
 * @h264_slice_param : the parameters that hardware use to decode
 * @dpb : decoded picture buffer used to store reference buffer information
 */
struct vdec_h264_slice_inst {
	unsigned int num_nalu;
	struct mtk_vcodec_ctx *ctx;
	struct mtk_vcodec_mem pred_buf;
	struct mtk_vcodec_mem mv_buf[H264_MAX_MV_NUM];
	struct vdec_vpu_inst vpu;
	struct vdec_h264_vsi vsi_ctx;
	struct mtk_h264_dec_slice_param h264_slice_param;

	struct v4l2_h264_dpb_entry dpb[16];
};

static int get_vdec_decode_parameters(struct vdec_h264_slice_inst *inst)
{
	const struct v4l2_ctrl_h264_decode_params *dec_params;
	const struct v4l2_ctrl_h264_sps *sps;
	const struct v4l2_ctrl_h264_pps *pps;
	const struct v4l2_ctrl_h264_scaling_matrix *scaling_matrix;
	struct mtk_h264_dec_slice_param *slice_param = &inst->h264_slice_param;
	struct v4l2_h264_reflist_builder reflist_builder;
	struct v4l2_h264_reference v4l2_p0_reflist[V4L2_H264_REF_LIST_LEN];
	struct v4l2_h264_reference v4l2_b0_reflist[V4L2_H264_REF_LIST_LEN];
	struct v4l2_h264_reference v4l2_b1_reflist[V4L2_H264_REF_LIST_LEN];
	u8 *p0_reflist = slice_param->decode_params.ref_pic_list_p0;
	u8 *b0_reflist = slice_param->decode_params.ref_pic_list_b0;
	u8 *b1_reflist = slice_param->decode_params.ref_pic_list_b1;

	dec_params =
		mtk_vdec_h264_get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_DECODE_PARAMS);
	if (IS_ERR(dec_params))
		return PTR_ERR(dec_params);

	sps = mtk_vdec_h264_get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_SPS);
	if (IS_ERR(sps))
		return PTR_ERR(sps);

	pps = mtk_vdec_h264_get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_PPS);
	if (IS_ERR(pps))
		return PTR_ERR(pps);

	scaling_matrix =
		mtk_vdec_h264_get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_SCALING_MATRIX);
	if (IS_ERR(scaling_matrix))
		return PTR_ERR(scaling_matrix);

	mtk_vdec_h264_update_dpb(dec_params, inst->dpb);

	mtk_vdec_h264_copy_sps_params(&slice_param->sps, sps);
	mtk_vdec_h264_copy_pps_params(&slice_param->pps, pps);
	mtk_vdec_h264_copy_scaling_matrix(&slice_param->scaling_matrix, scaling_matrix);
	mtk_vdec_h264_copy_decode_params(&slice_param->decode_params,
					 dec_params, inst->dpb);
	mtk_vdec_h264_fill_dpb_info(inst->ctx, &slice_param->decode_params,
				    slice_param->h264_dpb_info);

	/* Build the reference lists */
	v4l2_h264_init_reflist_builder(&reflist_builder, dec_params, sps,
				       inst->dpb);
	v4l2_h264_build_p_ref_list(&reflist_builder, v4l2_p0_reflist);
	v4l2_h264_build_b_ref_lists(&reflist_builder, v4l2_b0_reflist,
				    v4l2_b1_reflist);

	/* Adapt the built lists to the firmware's expectations */
	mtk_vdec_h264_get_ref_list(p0_reflist, v4l2_p0_reflist, reflist_builder.num_valid);
	mtk_vdec_h264_get_ref_list(b0_reflist, v4l2_b0_reflist, reflist_builder.num_valid);
	mtk_vdec_h264_get_ref_list(b1_reflist, v4l2_b1_reflist, reflist_builder.num_valid);

	memcpy(&inst->vsi_ctx.h264_slice_params, slice_param,
	       sizeof(inst->vsi_ctx.h264_slice_params));

	return 0;
}

static int allocate_predication_buf(struct vdec_h264_slice_inst *inst)
{
	int err;

	inst->pred_buf.size = BUF_PREDICTION_SZ;
	err = mtk_vcodec_mem_alloc(inst->ctx, &inst->pred_buf);
	if (err) {
		mtk_vcodec_err(inst, "failed to allocate ppl buf");
		return err;
	}

	inst->vsi_ctx.pred_buf_dma = inst->pred_buf.dma_addr;
	return 0;
}

static void free_predication_buf(struct vdec_h264_slice_inst *inst)
{
	struct mtk_vcodec_mem *mem = &inst->pred_buf;

	mtk_vcodec_debug_enter(inst);

	inst->vsi_ctx.pred_buf_dma = 0;
	if (mem->va)
		mtk_vcodec_mem_free(inst->ctx, mem);
}

static int alloc_mv_buf(struct vdec_h264_slice_inst *inst,
			struct vdec_pic_info *pic)
{
	int i;
	int err;
	struct mtk_vcodec_mem *mem = NULL;
	unsigned int buf_sz = mtk_vdec_h264_get_mv_buf_size(pic->buf_w, pic->buf_h);

	mtk_v4l2_debug(3, "size = 0x%x", buf_sz);
	for (i = 0; i < H264_MAX_MV_NUM; i++) {
		mem = &inst->mv_buf[i];
		if (mem->va)
			mtk_vcodec_mem_free(inst->ctx, mem);
		mem->size = buf_sz;
		err = mtk_vcodec_mem_alloc(inst->ctx, mem);
		if (err) {
			mtk_vcodec_err(inst, "failed to allocate mv buf");
			return err;
		}
		inst->vsi_ctx.mv_buf_dma[i] = mem->dma_addr;
	}

	return 0;
}

static void free_mv_buf(struct vdec_h264_slice_inst *inst)
{
	int i;
	struct mtk_vcodec_mem *mem;

	for (i = 0; i < H264_MAX_MV_NUM; i++) {
		inst->vsi_ctx.mv_buf_dma[i] = 0;
		mem = &inst->mv_buf[i];
		if (mem->va)
			mtk_vcodec_mem_free(inst->ctx, mem);
	}
}

static void get_pic_info(struct vdec_h264_slice_inst *inst,
			 struct vdec_pic_info *pic)
{
	struct mtk_vcodec_ctx *ctx = inst->ctx;

	ctx->picinfo.buf_w = ALIGN(ctx->picinfo.pic_w, VCODEC_DEC_ALIGNED_64);
	ctx->picinfo.buf_h = ALIGN(ctx->picinfo.pic_h, VCODEC_DEC_ALIGNED_64);
	ctx->picinfo.fb_sz[0] = ctx->picinfo.buf_w * ctx->picinfo.buf_h;
	ctx->picinfo.fb_sz[1] = ctx->picinfo.fb_sz[0] >> 1;
	inst->vsi_ctx.dec.cap_num_planes =
		ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes;

	*pic = ctx->picinfo;
	mtk_vcodec_debug(inst, "pic(%d, %d), buf(%d, %d)",
			 ctx->picinfo.pic_w, ctx->picinfo.pic_h,
			 ctx->picinfo.buf_w, ctx->picinfo.buf_h);
	mtk_vcodec_debug(inst, "Y/C(%d, %d)", ctx->picinfo.fb_sz[0],
			 ctx->picinfo.fb_sz[1]);

	if (ctx->last_decoded_picinfo.pic_w != ctx->picinfo.pic_w ||
	    ctx->last_decoded_picinfo.pic_h != ctx->picinfo.pic_h) {
		inst->vsi_ctx.dec.resolution_changed = true;
		if (ctx->last_decoded_picinfo.buf_w != ctx->picinfo.buf_w ||
		    ctx->last_decoded_picinfo.buf_h != ctx->picinfo.buf_h)
			inst->vsi_ctx.dec.realloc_mv_buf = true;

		mtk_v4l2_debug(1, "ResChg: (%d %d) : old(%d, %d) -> new(%d, %d)",
			       inst->vsi_ctx.dec.resolution_changed,
			       inst->vsi_ctx.dec.realloc_mv_buf,
			       ctx->last_decoded_picinfo.pic_w,
			       ctx->last_decoded_picinfo.pic_h,
			       ctx->picinfo.pic_w, ctx->picinfo.pic_h);
	}
}

static void get_crop_info(struct vdec_h264_slice_inst *inst, struct v4l2_rect *cr)
{
	cr->left = inst->vsi_ctx.crop.left;
	cr->top = inst->vsi_ctx.crop.top;
	cr->width = inst->vsi_ctx.crop.width;
	cr->height = inst->vsi_ctx.crop.height;

	mtk_vcodec_debug(inst, "l=%d, t=%d, w=%d, h=%d",
			 cr->left, cr->top, cr->width, cr->height);
}

static void get_dpb_size(struct vdec_h264_slice_inst *inst, unsigned int *dpb_sz)
{
	*dpb_sz = inst->vsi_ctx.dec.dpb_sz;
	mtk_vcodec_debug(inst, "sz=%d", *dpb_sz);
}

static int vdec_h264_slice_init(struct mtk_vcodec_ctx *ctx)
{
	struct vdec_h264_slice_inst *inst;
	int err;

	inst = kzalloc(sizeof(*inst), GFP_KERNEL);
	if (!inst)
		return -ENOMEM;

	inst->ctx = ctx;

	inst->vpu.id = SCP_IPI_VDEC_H264;
	inst->vpu.ctx = ctx;

	err = vpu_dec_init(&inst->vpu);
	if (err) {
		mtk_vcodec_err(inst, "vdec_h264 init err=%d", err);
		goto error_free_inst;
	}

	memcpy(&inst->vsi_ctx, inst->vpu.vsi, sizeof(inst->vsi_ctx));
	inst->vsi_ctx.dec.resolution_changed = true;
	inst->vsi_ctx.dec.realloc_mv_buf = true;

	err = allocate_predication_buf(inst);
	if (err)
		goto error_deinit;

	mtk_vcodec_debug(inst, "struct size = %zu,%zu,%zu,%zu\n",
			 sizeof(struct mtk_h264_sps_param),
			 sizeof(struct mtk_h264_pps_param),
			 sizeof(struct mtk_h264_dec_slice_param),
			 sizeof(struct mtk_h264_dpb_info));

	mtk_vcodec_debug(inst, "H264 Instance >> %p", inst);

	ctx->drv_handle = inst;
	return 0;

error_deinit:
	vpu_dec_deinit(&inst->vpu);

error_free_inst:
	kfree(inst);
	return err;
}

static void vdec_h264_slice_deinit(void *h_vdec)
{
	struct vdec_h264_slice_inst *inst = h_vdec;

	mtk_vcodec_debug_enter(inst);

	vpu_dec_deinit(&inst->vpu);
	free_predication_buf(inst);
	free_mv_buf(inst);

	kfree(inst);
}

static int vdec_h264_slice_decode(void *h_vdec, struct mtk_vcodec_mem *bs,
				  struct vdec_fb *unused, bool *res_chg)
{
	struct vdec_h264_slice_inst *inst = h_vdec;
	const struct v4l2_ctrl_h264_decode_params *dec_params =
		mtk_vdec_h264_get_ctrl_ptr(inst->ctx, V4L2_CID_STATELESS_H264_DECODE_PARAMS);
	struct vdec_vpu_inst *vpu = &inst->vpu;
	struct mtk_video_dec_buf *src_buf_info;
	struct mtk_video_dec_buf *dst_buf_info;
	struct vdec_fb *fb;
	u32 data[2];
	u64 y_fb_dma;
	u64 c_fb_dma;
	int err;

	inst->num_nalu++;
	/* bs NULL means flush decoder */
	if (!bs)
		return vpu_dec_reset(vpu);

	fb = inst->ctx->dev->vdec_pdata->get_cap_buffer(inst->ctx);
	src_buf_info = container_of(bs, struct mtk_video_dec_buf, bs_buffer);
	dst_buf_info = container_of(fb, struct mtk_video_dec_buf, frame_buffer);

	y_fb_dma = fb ? (u64)fb->base_y.dma_addr : 0;
	c_fb_dma = fb ? (u64)fb->base_c.dma_addr : 0;

	mtk_vcodec_debug(inst, "+ [%d] FB y_dma=%llx c_dma=%llx va=%p",
			 inst->num_nalu, y_fb_dma, c_fb_dma, fb);

	inst->vsi_ctx.dec.bs_dma = (uint64_t)bs->dma_addr;
	inst->vsi_ctx.dec.y_fb_dma = y_fb_dma;
	inst->vsi_ctx.dec.c_fb_dma = c_fb_dma;
	inst->vsi_ctx.dec.vdec_fb_va = (u64)(uintptr_t)fb;

	v4l2_m2m_buf_copy_metadata(&src_buf_info->m2m_buf.vb,
				   &dst_buf_info->m2m_buf.vb, true);
	err = get_vdec_decode_parameters(inst);
	if (err)
		goto err_free_fb_out;

	data[0] = bs->size;
	/*
	 * Reconstruct the first byte of the NAL unit, as the firmware requests
	 * that information to be passed even though it is present in the stream
	 * itself...
	 */
	data[1] = (dec_params->nal_ref_idc << 5) |
		  ((dec_params->flags & V4L2_H264_DECODE_PARAM_FLAG_IDR_PIC)
			? 0x5 : 0x1);

	*res_chg = inst->vsi_ctx.dec.resolution_changed;
	if (*res_chg) {
		mtk_vcodec_debug(inst, "- resolution changed -");
		if (inst->vsi_ctx.dec.realloc_mv_buf) {
			err = alloc_mv_buf(inst, &inst->ctx->picinfo);
			inst->vsi_ctx.dec.realloc_mv_buf = false;
			if (err)
				goto err_free_fb_out;
		}
		*res_chg = false;
	}

	memcpy(inst->vpu.vsi, &inst->vsi_ctx, sizeof(inst->vsi_ctx));
	err = vpu_dec_start(vpu, data, 2);
	if (err)
		goto err_free_fb_out;

	/* wait decoder done interrupt */
	err = mtk_vcodec_wait_for_done_ctx(inst->ctx,
					   MTK_INST_IRQ_RECEIVED,
					   WAIT_INTR_TIMEOUT_MS, 0);
	if (err)
		goto err_free_fb_out;
	vpu_dec_end(vpu);

	memcpy(&inst->vsi_ctx, inst->vpu.vsi, sizeof(inst->vsi_ctx));
	mtk_vcodec_debug(inst, "\n - NALU[%d]", inst->num_nalu);
	return 0;

err_free_fb_out:
	mtk_vcodec_err(inst, "\n - NALU[%d] err=%d -\n", inst->num_nalu, err);
	return err;
}

static int vdec_h264_slice_get_param(void *h_vdec, enum vdec_get_param_type type, void *out)
{
	struct vdec_h264_slice_inst *inst = h_vdec;

	switch (type) {
	case GET_PARAM_PIC_INFO:
		get_pic_info(inst, out);
		break;

	case GET_PARAM_DPB_SIZE:
		get_dpb_size(inst, out);
		break;

	case GET_PARAM_CROP_INFO:
		get_crop_info(inst, out);
		break;

	default:
		mtk_vcodec_err(inst, "invalid get parameter type=%d", type);
		return -EINVAL;
	}

	return 0;
}

const struct vdec_common_if vdec_h264_slice_if = {
	.init		= vdec_h264_slice_init,
	.decode		= vdec_h264_slice_decode,
	.get_param	= vdec_h264_slice_get_param,
	.deinit		= vdec_h264_slice_deinit,
};