drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2016 MediaTek Inc.
  * Author: PC Chen <pc.chen@mediatek.com>
  *         Tiffany Lin <tiffany.lin@mediatek.com>
  */

 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/of.h>
 #include <media/v4l2-event.h>
 #include <media/v4l2-mem2mem.h>
 #include <media/videobuf2-dma-contig.h>

 #include "mtk_vcodec_drv.h"
 #include "mtk_vcodec_dec.h"
 #include "mtk_vcodec_dec_pm.h"
 #include "mtk_vcodec_intr.h"
 #include "mtk_vcodec_util.h"
 #include "mtk_vcodec_fw.h"

 #define VDEC_HW_ACTIVE	0x10
 #define VDEC_IRQ_CFG	0x11
 #define VDEC_IRQ_CLR	0x10
 #define VDEC_IRQ_CFG_REG	0xa4

 module_param(mtk_v4l2_dbg_level, int, 0644);
 module_param(mtk_vcodec_dbg, bool, 0644);

 /* Wake up context wait_queue */
 static void wake_up_ctx(struct mtk_vcodec_ctx *ctx)
 {
 	ctx->int_cond = 1;
 	wake_up_interruptible(&ctx->queue);
 }

 static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv)
 {
 	struct mtk_vcodec_dev *dev = priv;
 	struct mtk_vcodec_ctx *ctx;
 	u32 cg_status = 0;
 	unsigned int dec_done_status = 0;
 	void __iomem *vdec_misc_addr = dev->reg_base[VDEC_MISC] +
 					VDEC_IRQ_CFG_REG;

 	ctx = mtk_vcodec_get_curr_ctx(dev);

 	/* check if HW active or not */
 	cg_status = readl(dev->reg_base[0]);
 	if ((cg_status & VDEC_HW_ACTIVE) != 0) {
 		mtk_v4l2_err("DEC ISR, VDEC active is not 0x0 (0x%08x)",
 			     cg_status);
 		return IRQ_HANDLED;
 	}

 	dec_done_status = readl(vdec_misc_addr);
 	ctx->irq_status = dec_done_status;
 	if ((dec_done_status & MTK_VDEC_IRQ_STATUS_DEC_SUCCESS) !=
 		MTK_VDEC_IRQ_STATUS_DEC_SUCCESS)
 		return IRQ_HANDLED;

 	/* clear interrupt */
 	writel((readl(vdec_misc_addr) | VDEC_IRQ_CFG),
 		dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);
 	writel((readl(vdec_misc_addr) & ~VDEC_IRQ_CLR),
 		dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);

 	wake_up_ctx(ctx);

 	mtk_v4l2_debug(3,
 			"mtk_vcodec_dec_irq_handler :wake up ctx %d, dec_done_status=%x",
 			ctx->id, dec_done_status);

 	return IRQ_HANDLED;
 }

 static int fops_vcodec_open(struct file *file)
 {
 	struct mtk_vcodec_dev *dev = video_drvdata(file);
 	struct mtk_vcodec_ctx *ctx = NULL;
 	struct mtk_video_dec_buf *mtk_buf = NULL;
 	int ret = 0;
 	struct vb2_queue *src_vq;

 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;
 	mtk_buf = kzalloc(sizeof(*mtk_buf), GFP_KERNEL);
 	if (!mtk_buf) {
 		kfree(ctx);
 		return -ENOMEM;
 	}

 	mutex_lock(&dev->dev_mutex);
 	ctx->empty_flush_buf = mtk_buf;
 	ctx->id = dev->id_counter++;
 	v4l2_fh_init(&ctx->fh, video_devdata(file));
 	file->private_data = &ctx->fh;
 	v4l2_fh_add(&ctx->fh);
 	INIT_LIST_HEAD(&ctx->list);
 	ctx->dev = dev;
 	init_waitqueue_head(&ctx->queue);
 	mutex_init(&ctx->lock);

 	ctx->type = MTK_INST_DECODER;
 	ret = mtk_vcodec_dec_ctrls_setup(ctx);
 	if (ret) {
 		mtk_v4l2_err("Failed to setup mt vcodec controls");
 		goto err_ctrls_setup;
 	}
 	ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev_dec, ctx,
 		&mtk_vcodec_dec_queue_init);
 	if (IS_ERR((__force void *)ctx->m2m_ctx)) {
 		ret = PTR_ERR((__force void *)ctx->m2m_ctx);
 		mtk_v4l2_err("Failed to v4l2_m2m_ctx_init() (%d)",
 			ret);
 		goto err_m2m_ctx_init;
 	}
 	src_vq = v4l2_m2m_get_vq(ctx->m2m_ctx,
 				V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
 	ctx->empty_flush_buf->m2m_buf.vb.vb2_buf.vb2_queue = src_vq;
 	ctx->empty_flush_buf->lastframe = true;
 	mtk_vcodec_dec_set_default_params(ctx);

 	if (v4l2_fh_is_singular(&ctx->fh)) {
 		ret = mtk_vcodec_dec_pw_on(&dev->pm);
 		if (ret < 0)
 			goto err_load_fw;
 		/*
 		 * Does nothing if firmware was already loaded.
 		 */
 		ret = mtk_vcodec_fw_load_firmware(dev->fw_handler);
 		if (ret < 0) {
 			/*
 			 * Return 0 if downloading firmware successfully,
 			 * otherwise it is failed
 			 */
 			mtk_v4l2_err("failed to load firmware!");
 			goto err_load_fw;
 		}

 		dev->dec_capability =
 			mtk_vcodec_fw_get_vdec_capa(dev->fw_handler);
 		mtk_v4l2_debug(0, "decoder capability %x", dev->dec_capability);
 	}

 	list_add(&ctx->list, &dev->ctx_list);

 	mutex_unlock(&dev->dev_mutex);
 	mtk_v4l2_debug(0, "%s decoder [%d]", dev_name(&dev->plat_dev->dev),
 			ctx->id);
 	return ret;

 	/* Deinit when failure occurred */
 err_load_fw:
 	v4l2_m2m_ctx_release(ctx->m2m_ctx);
 err_m2m_ctx_init:
 	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
 err_ctrls_setup:
 	v4l2_fh_del(&ctx->fh);
 	v4l2_fh_exit(&ctx->fh);
 	kfree(ctx->empty_flush_buf);
 	kfree(ctx);
 	mutex_unlock(&dev->dev_mutex);

 	return ret;
 }

 static int fops_vcodec_release(struct file *file)
 {
 	struct mtk_vcodec_dev *dev = video_drvdata(file);
 	struct mtk_vcodec_ctx *ctx = fh_to_ctx(file->private_data);

 	mtk_v4l2_debug(0, "[%d] decoder", ctx->id);
 	mutex_lock(&dev->dev_mutex);

 	/*
 	 * Call v4l2_m2m_ctx_release before mtk_vcodec_dec_release. First, it
 	 * makes sure the worker thread is not running after vdec_if_deinit.
 	 * Second, the decoder will be flushed and all the buffers will be
 	 * returned in stop_streaming.
 	 */
 	v4l2_m2m_ctx_release(ctx->m2m_ctx);
 	mtk_vcodec_dec_release(ctx);

 	if (v4l2_fh_is_singular(&ctx->fh))
 		mtk_vcodec_dec_pw_off(&dev->pm);
 	v4l2_fh_del(&ctx->fh);
 	v4l2_fh_exit(&ctx->fh);
 	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);

 	list_del_init(&ctx->list);
 	kfree(ctx->empty_flush_buf);
 	kfree(ctx);
 	mutex_unlock(&dev->dev_mutex);
 	return 0;
 }

 static const struct v4l2_file_operations mtk_vcodec_fops = {
 	.owner		= THIS_MODULE,
 	.open		= fops_vcodec_open,
 	.release	= fops_vcodec_release,
 	.poll		= v4l2_m2m_fop_poll,
 	.unlocked_ioctl	= video_ioctl2,
 	.mmap		= v4l2_m2m_fop_mmap,
 };

 static int mtk_vcodec_probe(struct platform_device *pdev)
 {
 	struct mtk_vcodec_dev *dev;
 	struct video_device *vfd_dec;
 	struct resource *res;
 	phandle rproc_phandle;
 	enum mtk_vcodec_fw_type fw_type;
 	int i, ret;

 	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;

 	INIT_LIST_HEAD(&dev->ctx_list);
 	dev->plat_dev = pdev;

 	if (!of_property_read_u32(pdev->dev.of_node, "mediatek,vpu",
 				  &rproc_phandle)) {
 		fw_type = VPU;
 	} else if (!of_property_read_u32(pdev->dev.of_node, "mediatek,scp",
 					 &rproc_phandle)) {
 		fw_type = SCP;
 	} else {
 		mtk_v4l2_err("Could not get vdec IPI device");
 		return -ENODEV;
 	}
 	if (!pdev->dev.dma_parms) {
 		pdev->dev.dma_parms = devm_kzalloc(&pdev->dev,
 						sizeof(*pdev->dev.dma_parms),
 						GFP_KERNEL);
 		if (!pdev->dev.dma_parms)
 			return -ENOMEM;
 	}
 	dma_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));

 	dev->fw_handler = mtk_vcodec_fw_select(dev, fw_type, DECODER);
 	if (IS_ERR(dev->fw_handler))
 		return PTR_ERR(dev->fw_handler);

 	ret = mtk_vcodec_init_dec_pm(dev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "Failed to get mt vcodec clock source");
 		goto err_dec_pm;
 	}

 	for (i = 0; i < NUM_MAX_VDEC_REG_BASE; i++) {
 		dev->reg_base[i] = devm_platform_ioremap_resource(pdev, i);
 		if (IS_ERR((__force void *)dev->reg_base[i])) {
 			ret = PTR_ERR((__force void *)dev->reg_base[i]);
 			goto err_res;
 		}
 		mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]);
 	}

 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "failed to get irq resource");
 		ret = -ENOENT;
 		goto err_res;
 	}

 	dev->dec_irq = platform_get_irq(pdev, 0);
 	irq_set_status_flags(dev->dec_irq, IRQ_NOAUTOEN);
 	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
 			mtk_vcodec_dec_irq_handler, 0, pdev->name, dev);
 	if (ret) {
 		dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
 			dev->dec_irq,
 			ret);
 		goto err_res;
 	}

 	mutex_init(&dev->dec_mutex);
 	mutex_init(&dev->dev_mutex);
 	spin_lock_init(&dev->irqlock);

 	snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name), "%s",
 		"[/MTK_V4L2_VDEC]");

 	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
 	if (ret) {
 		mtk_v4l2_err("v4l2_device_register err=%d", ret);
 		goto err_res;
 	}

 	init_waitqueue_head(&dev->queue);

 	vfd_dec = video_device_alloc();
 	if (!vfd_dec) {
 		mtk_v4l2_err("Failed to allocate video device");
 		ret = -ENOMEM;
 		goto err_dec_alloc;
 	}
 	vfd_dec->fops		= &mtk_vcodec_fops;
 	vfd_dec->ioctl_ops	= &mtk_vdec_ioctl_ops;
 	vfd_dec->release	= video_device_release;
 	vfd_dec->lock		= &dev->dev_mutex;
 	vfd_dec->v4l2_dev	= &dev->v4l2_dev;
 	vfd_dec->vfl_dir	= VFL_DIR_M2M;
 	vfd_dec->device_caps	= V4L2_CAP_VIDEO_M2M_MPLANE |
 			V4L2_CAP_STREAMING;

 	snprintf(vfd_dec->name, sizeof(vfd_dec->name), "%s",
 		MTK_VCODEC_DEC_NAME);
 	video_set_drvdata(vfd_dec, dev);
 	dev->vfd_dec = vfd_dec;
 	platform_set_drvdata(pdev, dev);

 	dev->m2m_dev_dec = v4l2_m2m_init(&mtk_vdec_m2m_ops);
 	if (IS_ERR((__force void *)dev->m2m_dev_dec)) {
 		mtk_v4l2_err("Failed to init mem2mem dec device");
 		ret = PTR_ERR((__force void *)dev->m2m_dev_dec);
 		goto err_dec_mem_init;
 	}

 	dev->decode_workqueue =
 		alloc_ordered_workqueue(MTK_VCODEC_DEC_NAME,
 			WQ_MEM_RECLAIM | WQ_FREEZABLE);
 	if (!dev->decode_workqueue) {
 		mtk_v4l2_err("Failed to create decode workqueue");
 		ret = -EINVAL;
 		goto err_event_workq;
 	}

 	ret = video_register_device(vfd_dec, VFL_TYPE_VIDEO, 0);
 	if (ret) {
 		mtk_v4l2_err("Failed to register video device");
 		goto err_dec_reg;
 	}

 	mtk_v4l2_debug(0, "decoder registered as /dev/video%d",
 		vfd_dec->num);

 	return 0;

 err_dec_reg:
 	destroy_workqueue(dev->decode_workqueue);
 err_event_workq:
 	v4l2_m2m_release(dev->m2m_dev_dec);
 err_dec_mem_init:
 	video_unregister_device(vfd_dec);
 err_dec_alloc:
 	v4l2_device_unregister(&dev->v4l2_dev);
 err_res:
 	mtk_vcodec_release_dec_pm(dev);
 err_dec_pm:
 	mtk_vcodec_fw_release(dev->fw_handler);
 	return ret;
 }

 static const struct of_device_id mtk_vcodec_match[] = {
 	{.compatible = "mediatek,mt8173-vcodec-dec",},
 	{},
 };

 MODULE_DEVICE_TABLE(of, mtk_vcodec_match);

 static int mtk_vcodec_dec_remove(struct platform_device *pdev)
 {
 	struct mtk_vcodec_dev *dev = platform_get_drvdata(pdev);

 	flush_workqueue(dev->decode_workqueue);
 	destroy_workqueue(dev->decode_workqueue);
 	if (dev->m2m_dev_dec)
 		v4l2_m2m_release(dev->m2m_dev_dec);

 	if (dev->vfd_dec)
 		video_unregister_device(dev->vfd_dec);

 	v4l2_device_unregister(&dev->v4l2_dev);
 	mtk_vcodec_release_dec_pm(dev);
 	mtk_vcodec_fw_release(dev->fw_handler);
 	return 0;
 }

 static struct platform_driver mtk_vcodec_dec_driver = {
 	.probe	= mtk_vcodec_probe,
 	.remove	= mtk_vcodec_dec_remove,
 	.driver	= {
 		.name	= MTK_VCODEC_DEC_NAME,
 		.of_match_table = mtk_vcodec_match,
 	},
 };

 module_platform_driver(mtk_vcodec_dec_driver);

 MODULE_LICENSE("GPL v2");
 MODULE_DESCRIPTION("Mediatek video codec V4L2 decoder driver");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2016 MediaTek Inc.
	* Author: PC Chen <pc.chen@mediatek.com>
	* Tiffany Lin <tiffany.lin@mediatek.com>
	*/

	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/of.h>
	#include <media/v4l2-event.h>
	#include <media/v4l2-mem2mem.h>
	#include <media/videobuf2-dma-contig.h>

	#include "mtk_vcodec_drv.h"
	#include "mtk_vcodec_dec.h"
	#include "mtk_vcodec_dec_pm.h"
	#include "mtk_vcodec_intr.h"
	#include "mtk_vcodec_util.h"
	#include "mtk_vcodec_fw.h"

	#define VDEC_HW_ACTIVE 0x10
	#define VDEC_IRQ_CFG 0x11
	#define VDEC_IRQ_CLR 0x10
	#define VDEC_IRQ_CFG_REG 0xa4

	module_param(mtk_v4l2_dbg_level, int, 0644);
	module_param(mtk_vcodec_dbg, bool, 0644);

	/* Wake up context wait_queue */
	static void wake_up_ctx(struct mtk_vcodec_ctx *ctx)
	{
	ctx->int_cond = 1;
	wake_up_interruptible(&ctx->queue);
	}

	static irqreturn_t mtk_vcodec_dec_irq_handler(int irq, void *priv)
	{
	struct mtk_vcodec_dev *dev = priv;
	struct mtk_vcodec_ctx *ctx;
	u32 cg_status = 0;
	unsigned int dec_done_status = 0;
	void __iomem *vdec_misc_addr = dev->reg_base[VDEC_MISC] +
	VDEC_IRQ_CFG_REG;

	ctx = mtk_vcodec_get_curr_ctx(dev);

	/* check if HW active or not */
	cg_status = readl(dev->reg_base[0]);
	if ((cg_status & VDEC_HW_ACTIVE) != 0) {
	mtk_v4l2_err("DEC ISR, VDEC active is not 0x0 (0x%08x)",
	cg_status);
	return IRQ_HANDLED;
	}

	dec_done_status = readl(vdec_misc_addr);
	ctx->irq_status = dec_done_status;
	if ((dec_done_status & MTK_VDEC_IRQ_STATUS_DEC_SUCCESS) !=
	MTK_VDEC_IRQ_STATUS_DEC_SUCCESS)
	return IRQ_HANDLED;

	/* clear interrupt */
	writel((readl(vdec_misc_addr) \| VDEC_IRQ_CFG),
	dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);
	writel((readl(vdec_misc_addr) & ~VDEC_IRQ_CLR),
	dev->reg_base[VDEC_MISC] + VDEC_IRQ_CFG_REG);

	wake_up_ctx(ctx);

	mtk_v4l2_debug(3,
	"mtk_vcodec_dec_irq_handler :wake up ctx %d, dec_done_status=%x",
	ctx->id, dec_done_status);

	return IRQ_HANDLED;
	}

	static int fops_vcodec_open(struct file *file)
	{
	struct mtk_vcodec_dev *dev = video_drvdata(file);
	struct mtk_vcodec_ctx *ctx = NULL;
	struct mtk_video_dec_buf *mtk_buf = NULL;
	int ret = 0;
	struct vb2_queue *src_vq;

	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
	return -ENOMEM;
	mtk_buf = kzalloc(sizeof(*mtk_buf), GFP_KERNEL);
	if (!mtk_buf) {
	kfree(ctx);
	return -ENOMEM;
	}

	mutex_lock(&dev->dev_mutex);
	ctx->empty_flush_buf = mtk_buf;
	ctx->id = dev->id_counter++;
	v4l2_fh_init(&ctx->fh, video_devdata(file));
	file->private_data = &ctx->fh;
	v4l2_fh_add(&ctx->fh);
	INIT_LIST_HEAD(&ctx->list);
	ctx->dev = dev;
	init_waitqueue_head(&ctx->queue);
	mutex_init(&ctx->lock);

	ctx->type = MTK_INST_DECODER;
	ret = mtk_vcodec_dec_ctrls_setup(ctx);
	if (ret) {
	mtk_v4l2_err("Failed to setup mt vcodec controls");
	goto err_ctrls_setup;
	}
	ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev_dec, ctx,
	&mtk_vcodec_dec_queue_init);
	if (IS_ERR((__force void *)ctx->m2m_ctx)) {
	ret = PTR_ERR((__force void *)ctx->m2m_ctx);
	mtk_v4l2_err("Failed to v4l2_m2m_ctx_init() (%d)",
	ret);
	goto err_m2m_ctx_init;
	}
	src_vq = v4l2_m2m_get_vq(ctx->m2m_ctx,
	V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE);
	ctx->empty_flush_buf->m2m_buf.vb.vb2_buf.vb2_queue = src_vq;
	ctx->empty_flush_buf->lastframe = true;
	mtk_vcodec_dec_set_default_params(ctx);

	if (v4l2_fh_is_singular(&ctx->fh)) {
	ret = mtk_vcodec_dec_pw_on(&dev->pm);
	if (ret < 0)
	goto err_load_fw;
	/*
	* Does nothing if firmware was already loaded.
	*/
	ret = mtk_vcodec_fw_load_firmware(dev->fw_handler);
	if (ret < 0) {
	/*
	* Return 0 if downloading firmware successfully,
	* otherwise it is failed
	*/
	mtk_v4l2_err("failed to load firmware!");
	goto err_load_fw;
	}

	dev->dec_capability =
	mtk_vcodec_fw_get_vdec_capa(dev->fw_handler);
	mtk_v4l2_debug(0, "decoder capability %x", dev->dec_capability);
	}

	list_add(&ctx->list, &dev->ctx_list);

	mutex_unlock(&dev->dev_mutex);
	mtk_v4l2_debug(0, "%s decoder [%d]", dev_name(&dev->plat_dev->dev),
	ctx->id);
	return ret;

	/* Deinit when failure occurred */
	err_load_fw:
	v4l2_m2m_ctx_release(ctx->m2m_ctx);
	err_m2m_ctx_init:
	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);
	err_ctrls_setup:
	v4l2_fh_del(&ctx->fh);
	v4l2_fh_exit(&ctx->fh);
	kfree(ctx->empty_flush_buf);
	kfree(ctx);
	mutex_unlock(&dev->dev_mutex);

	return ret;
	}

	static int fops_vcodec_release(struct file *file)
	{
	struct mtk_vcodec_dev *dev = video_drvdata(file);
	struct mtk_vcodec_ctx *ctx = fh_to_ctx(file->private_data);

	mtk_v4l2_debug(0, "[%d] decoder", ctx->id);
	mutex_lock(&dev->dev_mutex);

	/*
	* Call v4l2_m2m_ctx_release before mtk_vcodec_dec_release. First, it
	* makes sure the worker thread is not running after vdec_if_deinit.
	* Second, the decoder will be flushed and all the buffers will be
	* returned in stop_streaming.
	*/
	v4l2_m2m_ctx_release(ctx->m2m_ctx);
	mtk_vcodec_dec_release(ctx);

	if (v4l2_fh_is_singular(&ctx->fh))
	mtk_vcodec_dec_pw_off(&dev->pm);
	v4l2_fh_del(&ctx->fh);
	v4l2_fh_exit(&ctx->fh);
	v4l2_ctrl_handler_free(&ctx->ctrl_hdl);

	list_del_init(&ctx->list);
	kfree(ctx->empty_flush_buf);
	kfree(ctx);
	mutex_unlock(&dev->dev_mutex);
	return 0;
	}

	static const struct v4l2_file_operations mtk_vcodec_fops = {
	.owner = THIS_MODULE,
	.open = fops_vcodec_open,
	.release = fops_vcodec_release,
	.poll = v4l2_m2m_fop_poll,
	.unlocked_ioctl = video_ioctl2,
	.mmap = v4l2_m2m_fop_mmap,
	};

	static int mtk_vcodec_probe(struct platform_device *pdev)
	{
	struct mtk_vcodec_dev *dev;
	struct video_device *vfd_dec;
	struct resource *res;
	phandle rproc_phandle;
	enum mtk_vcodec_fw_type fw_type;
	int i, ret;

	dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
	if (!dev)
	return -ENOMEM;

	INIT_LIST_HEAD(&dev->ctx_list);
	dev->plat_dev = pdev;

	if (!of_property_read_u32(pdev->dev.of_node, "mediatek,vpu",
	&rproc_phandle)) {
	fw_type = VPU;
	} else if (!of_property_read_u32(pdev->dev.of_node, "mediatek,scp",
	&rproc_phandle)) {
	fw_type = SCP;
	} else {
	mtk_v4l2_err("Could not get vdec IPI device");
	return -ENODEV;
	}
	if (!pdev->dev.dma_parms) {
	pdev->dev.dma_parms = devm_kzalloc(&pdev->dev,
	sizeof(*pdev->dev.dma_parms),
	GFP_KERNEL);
	if (!pdev->dev.dma_parms)
	return -ENOMEM;
	}
	dma_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));

	dev->fw_handler = mtk_vcodec_fw_select(dev, fw_type, DECODER);
	if (IS_ERR(dev->fw_handler))
	return PTR_ERR(dev->fw_handler);

	ret = mtk_vcodec_init_dec_pm(dev);
	if (ret < 0) {
	dev_err(&pdev->dev, "Failed to get mt vcodec clock source");
	goto err_dec_pm;
	}

	for (i = 0; i < NUM_MAX_VDEC_REG_BASE; i++) {
	dev->reg_base[i] = devm_platform_ioremap_resource(pdev, i);
	if (IS_ERR((__force void *)dev->reg_base[i])) {
	ret = PTR_ERR((__force void *)dev->reg_base[i]);
	goto err_res;
	}
	mtk_v4l2_debug(2, "reg[%d] base=%p", i, dev->reg_base[i]);
	}

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (res == NULL) {
	dev_err(&pdev->dev, "failed to get irq resource");
	ret = -ENOENT;
	goto err_res;
	}

	dev->dec_irq = platform_get_irq(pdev, 0);
	irq_set_status_flags(dev->dec_irq, IRQ_NOAUTOEN);
	ret = devm_request_irq(&pdev->dev, dev->dec_irq,
	mtk_vcodec_dec_irq_handler, 0, pdev->name, dev);
	if (ret) {
	dev_err(&pdev->dev, "Failed to install dev->dec_irq %d (%d)",
	dev->dec_irq,
	ret);
	goto err_res;
	}

	mutex_init(&dev->dec_mutex);
	mutex_init(&dev->dev_mutex);
	spin_lock_init(&dev->irqlock);

	snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name), "%s",
	"[/MTK_V4L2_VDEC]");

	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
	if (ret) {
	mtk_v4l2_err("v4l2_device_register err=%d", ret);
	goto err_res;
	}

	init_waitqueue_head(&dev->queue);

	vfd_dec = video_device_alloc();
	if (!vfd_dec) {
	mtk_v4l2_err("Failed to allocate video device");
	ret = -ENOMEM;
	goto err_dec_alloc;
	}
	vfd_dec->fops = &mtk_vcodec_fops;
	vfd_dec->ioctl_ops = &mtk_vdec_ioctl_ops;
	vfd_dec->release = video_device_release;
	vfd_dec->lock = &dev->dev_mutex;
	vfd_dec->v4l2_dev = &dev->v4l2_dev;
	vfd_dec->vfl_dir = VFL_DIR_M2M;
	vfd_dec->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE \|
	V4L2_CAP_STREAMING;

	snprintf(vfd_dec->name, sizeof(vfd_dec->name), "%s",
	MTK_VCODEC_DEC_NAME);
	video_set_drvdata(vfd_dec, dev);
	dev->vfd_dec = vfd_dec;
	platform_set_drvdata(pdev, dev);

	dev->m2m_dev_dec = v4l2_m2m_init(&mtk_vdec_m2m_ops);
	if (IS_ERR((__force void *)dev->m2m_dev_dec)) {
	mtk_v4l2_err("Failed to init mem2mem dec device");
	ret = PTR_ERR((__force void *)dev->m2m_dev_dec);
	goto err_dec_mem_init;
	}

	dev->decode_workqueue =
	alloc_ordered_workqueue(MTK_VCODEC_DEC_NAME,
	WQ_MEM_RECLAIM \| WQ_FREEZABLE);
	if (!dev->decode_workqueue) {
	mtk_v4l2_err("Failed to create decode workqueue");
	ret = -EINVAL;
	goto err_event_workq;
	}

	ret = video_register_device(vfd_dec, VFL_TYPE_VIDEO, 0);
	if (ret) {
	mtk_v4l2_err("Failed to register video device");
	goto err_dec_reg;
	}

	mtk_v4l2_debug(0, "decoder registered as /dev/video%d",
	vfd_dec->num);

	return 0;

	err_dec_reg:
	destroy_workqueue(dev->decode_workqueue);
	err_event_workq:
	v4l2_m2m_release(dev->m2m_dev_dec);
	err_dec_mem_init:
	video_unregister_device(vfd_dec);
	err_dec_alloc:
	v4l2_device_unregister(&dev->v4l2_dev);
	err_res:
	mtk_vcodec_release_dec_pm(dev);
	err_dec_pm:
	mtk_vcodec_fw_release(dev->fw_handler);
	return ret;
	}

	static const struct of_device_id mtk_vcodec_match[] = {
	{.compatible = "mediatek,mt8173-vcodec-dec",},
	{},
	};

	MODULE_DEVICE_TABLE(of, mtk_vcodec_match);

	static int mtk_vcodec_dec_remove(struct platform_device *pdev)
	{
	struct mtk_vcodec_dev *dev = platform_get_drvdata(pdev);

	flush_workqueue(dev->decode_workqueue);
	destroy_workqueue(dev->decode_workqueue);
	if (dev->m2m_dev_dec)
	v4l2_m2m_release(dev->m2m_dev_dec);

	if (dev->vfd_dec)
	video_unregister_device(dev->vfd_dec);

	v4l2_device_unregister(&dev->v4l2_dev);
	mtk_vcodec_release_dec_pm(dev);
	mtk_vcodec_fw_release(dev->fw_handler);
	return 0;
	}

	static struct platform_driver mtk_vcodec_dec_driver = {
	.probe = mtk_vcodec_probe,
	.remove = mtk_vcodec_dec_remove,
	.driver = {
	.name = MTK_VCODEC_DEC_NAME,
	.of_match_table = mtk_vcodec_match,
	},
	};

	module_platform_driver(mtk_vcodec_dec_driver);

	MODULE_LICENSE("GPL v2");
	MODULE_DESCRIPTION("Mediatek video codec V4L2 decoder driver");