/*
 * Copyright (c) 2015-2016 MediaTek Inc.
 * Author: Houlong Wei <houlong.wei@mediatek.com>
 *         Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
 *
 * 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.
 */

#include "mtk_mdp_core.h"
#include "mtk_mdp_vpu.h"
#include "mtk_vpu.h"


static inline struct mtk_mdp_ctx *vpu_to_ctx(struct mtk_mdp_vpu *vpu)
{
	return container_of(vpu, struct mtk_mdp_ctx, vpu);
}

static void mtk_mdp_vpu_handle_init_ack(struct mdp_ipi_comm_ack *msg)
{
	struct mtk_mdp_vpu *vpu = (struct mtk_mdp_vpu *)
					(unsigned long)msg->ap_inst;
	struct mdp_cmdq_info *cmdq;

	/* mapping VPU address to kernel virtual address */
	vpu->vsi = (struct mdp_process_vsi *)
			vpu_mapping_dm_addr(vpu->pdev, msg->vpu_inst_addr);
	vpu->inst_addr = msg->vpu_inst_addr;

	/* mapping cmdq buffer address in VPU to kernel virtual address */
	cmdq = &vpu->vsi->cmdq;
	if (cmdq->vpu_buf_addr != 0uLL) {
		cmdq->ap_buf_addr = (uint64_t)(unsigned long)
			vpu_mapping_dm_addr(vpu->pdev,
				(unsigned long)cmdq->vpu_buf_addr);
		cmdq->ap_buf_pa = __pa(cmdq->ap_buf_addr);
	}
}

static void mtk_mdp_vpu_ipi_handler(void *data, unsigned int len, void *priv)
{
	unsigned int msg_id = *(unsigned int *)data;
	struct mdp_ipi_comm_ack *msg = (struct mdp_ipi_comm_ack *)data;
	struct mtk_mdp_vpu *vpu = (struct mtk_mdp_vpu *)
					(unsigned long)msg->ap_inst;
	struct mtk_mdp_ctx *ctx;

	vpu->failure = msg->status;
	if (!vpu->failure) {
		switch (msg_id) {
		case VPU_MDP_INIT_ACK:
			mtk_mdp_vpu_handle_init_ack(data);
			break;
		case VPU_MDP_DEINIT_ACK:
		case VPU_MDP_PROCESS_ACK:
		case VPU_MDP_CMDQ_DONE_ACK:
			break;
		default:
			ctx = vpu_to_ctx(vpu);
			dev_err(&ctx->mdp_dev->pdev->dev,
				"handle unknown ipi msg:0x%x\n",
				msg_id);
			break;
		}
	} else {
		ctx = vpu_to_ctx(vpu);
		mtk_mdp_dbg(0, "[%d]:msg 0x%x, failure:%d", ctx->id,
			    msg_id, vpu->failure);
	}
}

int mtk_mdp_vpu_register(struct platform_device *pdev)
{
	struct mtk_mdp_dev *mdp = platform_get_drvdata(pdev);
	int err;

	err = vpu_ipi_register(mdp->vpu_dev, IPI_MDP,
			       mtk_mdp_vpu_ipi_handler, "mdp_vpu", NULL);
	if (err)
		dev_err(&mdp->pdev->dev,
			"vpu_ipi_registration fail status=%d\n", err);

	return err;
}

static int mtk_mdp_vpu_send_msg(void *msg, int len, struct mtk_mdp_vpu *vpu,
				int id)
{
	struct mtk_mdp_ctx *ctx = vpu_to_ctx(vpu);
	int err;

	if (!vpu->pdev) {
		mtk_mdp_dbg(1, "[%d]:vpu pdev is NULL", ctx->id);
		return -EINVAL;
	}

	mutex_lock(&ctx->mdp_dev->vpulock);
	err = vpu_ipi_send(vpu->pdev, (enum ipi_id)id, msg, len);
	if (err)
		dev_err(&ctx->mdp_dev->pdev->dev,
			"vpu_ipi_send fail status %d\n", err);
	mutex_unlock(&ctx->mdp_dev->vpulock);

	return err;
}

static int mtk_mdp_vpu_send_ap_ipi(struct mtk_mdp_vpu *vpu, uint32_t msg_id)
{
	int err;
	struct mdp_ipi_comm msg;

	msg.msg_id = msg_id;
	msg.ipi_id = IPI_MDP;
	msg.vpu_inst_addr = vpu->inst_addr;
	msg.ap_inst = (unsigned long)vpu;
	err = mtk_mdp_vpu_send_msg((void *)&msg, sizeof(msg), vpu, IPI_MDP);
	if (!err && vpu->failure)
		err = -EINVAL;

	return err;
}

int mtk_mdp_vpu_init(struct mtk_mdp_vpu *vpu)
{
	int err;
	struct mdp_ipi_init msg;
	struct mtk_mdp_ctx *ctx = vpu_to_ctx(vpu);

	vpu->pdev = ctx->mdp_dev->vpu_dev;

	msg.msg_id = AP_MDP_INIT;
	msg.ipi_id = IPI_MDP;
	msg.ap_inst = (unsigned long)vpu;
	err = mtk_mdp_vpu_send_msg((void *)&msg, sizeof(msg), vpu, IPI_MDP);
	if (!err && vpu->failure)
		err = -EINVAL;

	return err;
}

int mtk_mdp_vpu_deinit(struct mtk_mdp_vpu *vpu)
{
	return mtk_mdp_vpu_send_ap_ipi(vpu, AP_MDP_DEINIT);
}

static int mtk_mdp_cmdq_exec(struct mtk_mdp_ctx *ctx,
	struct mdp_cmdq_info *cmdq)
{
	struct cmdq_pkt *handle  = ctx->cmdq_handle;
	int err, request_size;

	mtk_mdp_dbg(2, "eng=%llx,addr=%llx(%llx),offset=%u,size=%u",
		cmdq->engine_flag, cmdq->ap_buf_addr, cmdq->ap_buf_pa,
		cmdq->cmd_offset, cmdq->cmd_size);

	/* copy cmd buffer */
	handle->cmd_buf_size = 0;
	if (cmdq->cmd_size % CMDQ_INST_SIZE)
		return -EINVAL;

	request_size = cmdq->cmd_size;
	if (unlikely(request_size > handle->buf_size)) {
		request_size = roundup(request_size, PAGE_SIZE);

		handle = cmdq_pkt_create(ctx->mdp_dev->cmdq_client, request_size);
		if (IS_ERR(handle)) {
			err = PTR_ERR(handle);
			dev_err(&ctx->mdp_dev->pdev->dev,
				"Create cmdq ptk failed %d\n", err);
			return err;
		}

		cmdq_pkt_destroy(ctx->cmdq_handle);
		ctx->cmdq_handle = handle;
	}

	memcpy(handle->va_base,
		(void *)(unsigned long)cmdq->ap_buf_addr + cmdq->cmd_offset,
		cmdq->cmd_size);
	handle->cmd_buf_size = cmdq->cmd_size;

	/* execute cmd */
	err = cmdq_pkt_flush(handle);
	if (unlikely(err < 0))
		dev_err(&ctx->mdp_dev->pdev->dev, "cmdq flush failed!!!\n");

	return err;
}

int mtk_mdp_vpu_process(struct mtk_mdp_vpu *vpu)
{
	int err, use_cmdq;
	struct mtk_mdp_ctx *ctx;
	struct mdp_cmdq_info *cmdq;

	err = mtk_mdp_vpu_send_ap_ipi(vpu, (uint32_t)AP_MDP_PROCESS);

	use_cmdq = 0;
	cmdq = &vpu->vsi->cmdq;

	/* There are command in cmdq buffer, to use cmdq. */
	if (err == 0 && cmdq->ap_buf_addr != 0uLL && cmdq->cmd_size != 0u)
		use_cmdq = 1;

	if (use_cmdq) {
		ctx = container_of(vpu, struct mtk_mdp_ctx, vpu);

		err = mtk_mdp_cmdq_exec(ctx, cmdq);
		if (unlikely(err < 0))
			dev_err(&ctx->mdp_dev->pdev->dev,
				"cmdq execute failed!!!\n");

		/* notify VPU that cmdq instructions executed done */
		/* to do: add status in vpu->vsi->cmdq */
		err = mtk_mdp_vpu_send_ap_ipi(vpu, (uint32_t)AP_MDP_CMDQ_DONE);
	}

	return err;
}