Merging upstream version 6.7.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

4 files changed, 2000 insertions, 0 deletions

diff --git a/drivers/media/platform/nuvoton/Kconfig b/drivers/media/platform/nuvoton/Kconfig
new file mode 100644
index 0000000000..40b36d1be8
--- /dev/null
+++ b/drivers/media/platform/nuvoton/Kconfig
@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+comment "Nuvoton media platform drivers"
+
+config VIDEO_NPCM_VCD_ECE
+	tristate "Nuvoton NPCM Video Capture/Encode Engine driver"
+	depends on V4L_PLATFORM_DRIVERS && VIDEO_DEV
+	depends on ARCH_NPCM || COMPILE_TEST
+	select VIDEOBUF2_DMA_CONTIG
+	help
+	  Support for the Video Capture/Differentiation Engine (VCD) and
+	  Encoding Compression Engine (ECE) present on Nuvoton NPCM SoCs.
+	  The VCD can capture a frame from digital video input and compare
+	  two frames in memory, and then the ECE can compress the frame
+	  data into HEXTILE format.
diff --git a/drivers/media/platform/nuvoton/Makefile b/drivers/media/platform/nuvoton/Makefile
new file mode 100644
index 0000000000..74a4e3fc85
--- /dev/null
+++ b/drivers/media/platform/nuvoton/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_VIDEO_NPCM_VCD_ECE) += npcm-video.o
diff --git a/drivers/media/platform/nuvoton/npcm-regs.h b/drivers/media/platform/nuvoton/npcm-regs.h
new file mode 100644
index 0000000000..4a44f47f02
--- /dev/null
+++ b/drivers/media/platform/nuvoton/npcm-regs.h
@@ -0,0 +1,152 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Register definition header for NPCM video driver
+ *
+ * Copyright (C) 2022 Nuvoton Technologies
+ */
+
+#ifndef _NPCM_REGS_H
+#define _NPCM_REGS_H
+
+/* VCD Registers */
+#define VCD_DIFF_TBL			0x0000
+#define VCD_FBA_ADR			0x8000
+#define VCD_FBB_ADR			0x8004
+
+#define VCD_FB_LP			0x8008
+#define  VCD_FBA_LP			GENMASK(15, 0)
+#define  VCD_FBB_LP			GENMASK(31, 16)
+
+#define VCD_CAP_RES			0x800c
+#define  VCD_CAP_RES_VERT_RES		GENMASK(10, 0)
+#define  VCD_CAP_RES_HOR_RES		GENMASK(26, 16)
+
+#define VCD_MODE			0x8014
+#define  VCD_MODE_VCDE			BIT(0)
+#define  VCD_MODE_CM565			BIT(1)
+#define  VCD_MODE_IDBC			BIT(3)
+#define  VCD_MODE_KVM_BW_SET		BIT(16)
+
+#define VCD_CMD				0x8018
+#define  VCD_CMD_GO			BIT(0)
+#define  VCD_CMD_RST			BIT(1)
+#define  VCD_CMD_OPERATION		GENMASK(6, 4)
+#define   VCD_CMD_OPERATION_CAPTURE	0
+#define   VCD_CMD_OPERATION_COMPARE	2
+
+#define	VCD_STAT			0x801c
+#define	 VCD_STAT_DONE			BIT(0)
+#define	 VCD_STAT_IFOT			BIT(2)
+#define	 VCD_STAT_IFOR			BIT(3)
+#define	 VCD_STAT_VHT_CHG		BIT(5)
+#define	 VCD_STAT_HAC_CHG		BIT(8)
+#define	 VCD_STAT_BUSY			BIT(30)
+#define	VCD_STAT_CLEAR			0x3fff
+
+#define VCD_INTE			0x8020
+#define  VCD_INTE_DONE_IE		BIT(0)
+#define  VCD_INTE_IFOT_IE		BIT(2)
+#define  VCD_INTE_IFOR_IE		BIT(3)
+#define  VCD_INTE_VHT_IE		BIT(5)
+#define  VCD_INTE_HAC_IE		BIT(8)
+
+#define VCD_RCHG			0x8028
+#define  VCD_RCHG_IG_CHG0		GENMASK(2, 0)
+#define  VCD_RCHG_TIM_PRSCL		GENMASK(12, 9)
+
+#define VCD_VER_HI_TIM			0x8044
+#define  VCD_VER_HI_TIME		GENMASK(23, 0)
+
+#define VCD_VER_HI_LST			0x8048
+#define  VCD_VER_HI_LAST		GENMASK(23, 0)
+
+#define VCD_HOR_AC_TIM			0x804c
+#define  VCD_HOR_AC_TIME		GENMASK(13, 0)
+
+#define VCD_HOR_AC_LST			0x8050
+#define  VCD_HOR_AC_LAST		GENMASK(13, 0)
+
+#define VCD_FIFO			0x805c
+#define  VCD_FIFO_TH			0x100350ff
+
+#define VCD_FB_SIZE			0x500000 /* support up to 1920 x 1200 */
+#define VCD_KVM_BW_PCLK			120000000UL
+#define VCD_TIMEOUT_US			300000
+
+/* ECE Registers */
+#define ECE_DDA_CTRL			0x0000
+#define  ECE_DDA_CTRL_ECEEN		BIT(0)
+#define  ECE_DDA_CTRL_INTEN		BIT(8)
+
+#define ECE_DDA_STS			0x0004
+#define  ECE_DDA_STS_CDREADY		BIT(8)
+#define  ECE_DDA_STS_ACDRDY		BIT(10)
+
+#define ECE_FBR_BA			0x0008
+#define ECE_ED_BA			0x000c
+#define ECE_RECT_XY			0x0010
+
+#define ECE_RECT_DIMEN			0x0014
+#define  ECE_RECT_DIMEN_WR		GENMASK(10, 0)
+#define  ECE_RECT_DIMEN_WLTR		GENMASK(14, 11)
+#define  ECE_RECT_DIMEN_HR		GENMASK(26, 16)
+#define  ECE_RECT_DIMEN_HLTR		GENMASK(30, 27)
+
+#define ECE_RESOL			0x001c
+#define  ECE_RESOL_FB_LP_512		0
+#define  ECE_RESOL_FB_LP_1024		1
+#define  ECE_RESOL_FB_LP_2048		2
+#define  ECE_RESOL_FB_LP_2560		3
+#define  ECE_RESOL_FB_LP_4096		4
+
+#define ECE_HEX_CTRL			0x0040
+#define  ECE_HEX_CTRL_ENCDIS		BIT(0)
+#define  ECE_HEX_CTRL_ENC_GAP		GENMASK(12, 8)
+
+#define ECE_HEX_RECT_OFFSET		0x0048
+#define  ECE_HEX_RECT_OFFSET_MASK	GENMASK(22, 0)
+
+#define ECE_TILE_W			16
+#define ECE_TILE_H			16
+#define ECE_POLL_TIMEOUT_US		300000
+
+/* GCR Registers */
+#define INTCR				0x3c
+#define  INTCR_GFXIFDIS			GENMASK(9, 8)
+#define  INTCR_DEHS			BIT(27)
+
+#define INTCR2				0x60
+#define  INTCR2_GIRST2			BIT(2)
+#define  INTCR2_GIHCRST			BIT(5)
+#define  INTCR2_GIVCRST			BIT(6)
+
+/* GFXI Register */
+#define DISPST				0x00
+#define  DISPST_HSCROFF			BIT(1)
+#define  DISPST_MGAMODE			BIT(7)
+
+#define HVCNTL				0x10
+#define  HVCNTL_MASK			GENMASK(7, 0)
+
+#define HVCNTH				0x14
+#define  HVCNTH_MASK			GENMASK(2, 0)
+
+#define VVCNTL				0x20
+#define  VVCNTL_MASK			GENMASK(7, 0)
+
+#define VVCNTH				0x24
+#define  VVCNTH_MASK			GENMASK(2, 0)
+
+#define GPLLINDIV			0x40
+#define  GPLLINDIV_MASK			GENMASK(5, 0)
+#define  GPLLINDIV_GPLLFBDV8		BIT(7)
+
+#define GPLLFBDIV			0x44
+#define  GPLLFBDIV_MASK			GENMASK(7, 0)
+
+#define GPLLST				0x48
+#define  GPLLST_PLLOTDIV1		GENMASK(2, 0)
+#define  GPLLST_PLLOTDIV2		GENMASK(5, 3)
+#define  GPLLST_GPLLFBDV109		GENMASK(7, 6)
+
+#endif /* _NPCM_REGS_H */
diff --git a/drivers/media/platform/nuvoton/npcm-video.c b/drivers/media/platform/nuvoton/npcm-video.c
new file mode 100644
index 0000000000..b9e6782f59
--- /dev/null
+++ b/drivers/media/platform/nuvoton/npcm-video.c
@@ -0,0 +1,1831 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Video Capture/Differentiation Engine (VCD) and Encoding
+ * Compression Engine (ECE) present on Nuvoton NPCM SoCs.
+ *
+ * Copyright (C) 2022 Nuvoton Technologies
+ */
+
+#include <linux/atomic.h>
+#include <linux/bitfield.h>
+#include <linux/bitmap.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/v4l2-controls.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-dv-timings.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-ioctl.h>
+#include <media/videobuf2-dma-contig.h>
+#include <uapi/linux/npcm-video.h>
+#include "npcm-regs.h"
+
+#define DEVICE_NAME	"npcm-video"
+#define MAX_WIDTH	1920
+#define MAX_HEIGHT	1200
+#define MIN_WIDTH	320
+#define MIN_HEIGHT	240
+#define MIN_LP		512
+#define MAX_LP		4096
+#define RECT_W		16
+#define RECT_H		16
+#define BITMAP_SIZE	32
+
+struct npcm_video_addr {
+	size_t size;
+	dma_addr_t dma;
+	void *virt;
+};
+
+struct npcm_video_buffer {
+	struct vb2_v4l2_buffer vb;
+	struct list_head link;
+};
+
+#define to_npcm_video_buffer(x) \
+	container_of((x), struct npcm_video_buffer, vb)
+
+/*
+ * VIDEO_STREAMING:	a flag indicating if the video has started streaming
+ * VIDEO_CAPTURING:	a flag indicating if the VCD is capturing a frame
+ * VIDEO_RES_CHANGING:	a flag indicating if the resolution is changing
+ * VIDEO_STOPPED:	a flag indicating if the video has stopped streaming
+ */
+enum {
+	VIDEO_STREAMING,
+	VIDEO_CAPTURING,
+	VIDEO_RES_CHANGING,
+	VIDEO_STOPPED,
+};
+
+struct rect_list {
+	struct v4l2_clip clip;
+	struct list_head list;
+};
+
+struct rect_list_info {
+	struct rect_list *list;
+	struct rect_list *first;
+	struct list_head *head;
+	unsigned int index;
+	unsigned int tile_perline;
+	unsigned int tile_perrow;
+	unsigned int offset_perline;
+	unsigned int tile_size;
+	unsigned int tile_cnt;
+};
+
+struct npcm_ece {
+	struct regmap *regmap;
+	atomic_t clients;
+	struct reset_control *reset;
+	bool enable;
+};
+
+struct npcm_video {
+	struct regmap *gcr_regmap;
+	struct regmap *gfx_regmap;
+	struct regmap *vcd_regmap;
+
+	struct device *dev;
+	struct v4l2_ctrl_handler ctrl_handler;
+	struct v4l2_ctrl *rect_cnt_ctrl;
+	struct v4l2_device v4l2_dev;
+	struct v4l2_pix_format pix_fmt;
+	struct v4l2_bt_timings active_timings;
+	struct v4l2_bt_timings detected_timings;
+	unsigned int v4l2_input_status;
+	struct vb2_queue queue;
+	struct video_device vdev;
+	struct mutex video_lock; /* v4l2 and videobuf2 lock */
+
+	struct list_head buffers;
+	spinlock_t lock; /* buffer list lock */
+	unsigned long flags;
+	unsigned int sequence;
+
+	struct npcm_video_addr src;
+	struct reset_control *reset;
+	struct npcm_ece ece;
+
+	unsigned int bytesperline;
+	unsigned int bytesperpixel;
+	unsigned int rect_cnt;
+	struct list_head list[VIDEO_MAX_FRAME];
+	unsigned int rect[VIDEO_MAX_FRAME];
+	unsigned int ctrl_cmd;
+	unsigned int op_cmd;
+};
+
+#define to_npcm_video(x) container_of((x), struct npcm_video, v4l2_dev)
+
+struct npcm_fmt {
+	unsigned int fourcc;
+	unsigned int bpp; /* bytes per pixel */
+};
+
+static const struct npcm_fmt npcm_fmt_list[] = {
+	{
+		.fourcc = V4L2_PIX_FMT_RGB565,
+		.bpp	= 2,
+	},
+	{
+		.fourcc = V4L2_PIX_FMT_HEXTILE,
+		.bpp	= 2,
+	},
+};
+
+#define NUM_FORMATS ARRAY_SIZE(npcm_fmt_list)
+
+static const struct v4l2_dv_timings_cap npcm_video_timings_cap = {
+	.type = V4L2_DV_BT_656_1120,
+	.bt = {
+		.min_width = MIN_WIDTH,
+		.max_width = MAX_WIDTH,
+		.min_height = MIN_HEIGHT,
+		.max_height = MAX_HEIGHT,
+		.min_pixelclock = 6574080, /* 640 x 480 x 24Hz */
+		.max_pixelclock = 138240000, /* 1920 x 1200 x 60Hz */
+		.standards = V4L2_DV_BT_STD_CEA861 | V4L2_DV_BT_STD_DMT |
+			     V4L2_DV_BT_STD_CVT | V4L2_DV_BT_STD_GTF,
+		.capabilities = V4L2_DV_BT_CAP_PROGRESSIVE |
+				V4L2_DV_BT_CAP_REDUCED_BLANKING |
+				V4L2_DV_BT_CAP_CUSTOM,
+	},
+};
+
+static DECLARE_BITMAP(bitmap, BITMAP_SIZE);
+
+static const struct npcm_fmt *npcm_video_find_format(struct v4l2_format *f)
+{
+	const struct npcm_fmt *fmt;
+	unsigned int k;
+
+	for (k = 0; k < NUM_FORMATS; k++) {
+		fmt = &npcm_fmt_list[k];
+		if (fmt->fourcc == f->fmt.pix.pixelformat)
+			break;
+	}
+
+	if (k == NUM_FORMATS)
+		return NULL;
+
+	return &npcm_fmt_list[k];
+}
+
+static void npcm_video_ece_prepend_rect_header(void *addr, u16 x, u16 y, u16 w, u16 h)
+{
+	__be16 x_pos = cpu_to_be16(x);
+	__be16 y_pos = cpu_to_be16(y);
+	__be16 width = cpu_to_be16(w);
+	__be16 height = cpu_to_be16(h);
+	__be32 encoding = cpu_to_be32(5); /* Hextile encoding */
+
+	memcpy(addr, &x_pos, 2);
+	memcpy(addr + 2, &y_pos, 2);
+	memcpy(addr + 4, &width, 2);
+	memcpy(addr + 6, &height, 2);
+	memcpy(addr + 8, &encoding, 4);
+}
+
+static unsigned int npcm_video_ece_get_ed_size(struct npcm_video *video,
+					       unsigned int offset, void *addr)
+{
+	struct regmap *ece = video->ece.regmap;
+	unsigned int size, gap, val;
+	int ret;
+
+	ret = regmap_read_poll_timeout(ece, ECE_DDA_STS, val,
+				       (val & ECE_DDA_STS_CDREADY), 0,
+				       ECE_POLL_TIMEOUT_US);
+
+	if (ret) {
+		dev_warn(video->dev, "Wait for ECE_DDA_STS_CDREADY timeout\n");
+		return 0;
+	}
+
+	size = readl((void __iomem *)addr + offset);
+	regmap_read(ece, ECE_HEX_CTRL, &val);
+	gap = FIELD_GET(ECE_HEX_CTRL_ENC_GAP, val);
+
+	dev_dbg(video->dev, "offset = %u, ed_size = %u, gap = %u\n", offset,
+		size, gap);
+
+	return size + gap;
+}
+
+static void npcm_video_ece_enc_rect(struct npcm_video *video,
+				    unsigned int r_off_x, unsigned int r_off_y,
+				    unsigned int r_w, unsigned int r_h)
+{
+	struct regmap *ece = video->ece.regmap;
+	unsigned int rect_offset = (r_off_y * video->bytesperline) + (r_off_x * 2);
+	unsigned int w_size = ECE_TILE_W, h_size = ECE_TILE_H;
+	unsigned int temp, w_tile, h_tile;
+
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, 0);
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, ECE_DDA_CTRL_ECEEN);
+	regmap_write(ece, ECE_DDA_STS, ECE_DDA_STS_CDREADY | ECE_DDA_STS_ACDRDY);
+	regmap_write(ece, ECE_RECT_XY, rect_offset);
+
+	w_tile = r_w / ECE_TILE_W;
+	h_tile = r_h / ECE_TILE_H;
+
+	if (r_w % ECE_TILE_W) {
+		w_tile += 1;
+		w_size = r_w % ECE_TILE_W;
+	}
+	if (r_h % ECE_TILE_H || !h_tile) {
+		h_tile += 1;
+		h_size = r_h % ECE_TILE_H;
+	}
+
+	temp = FIELD_PREP(ECE_RECT_DIMEN_WLTR, w_size - 1) |
+	       FIELD_PREP(ECE_RECT_DIMEN_HLTR, h_size - 1) |
+	       FIELD_PREP(ECE_RECT_DIMEN_WR, w_tile - 1) |
+	       FIELD_PREP(ECE_RECT_DIMEN_HR, h_tile - 1);
+
+	regmap_write(ece, ECE_RECT_DIMEN, temp);
+}
+
+static unsigned int npcm_video_ece_read_rect_offset(struct npcm_video *video)
+{
+	struct regmap *ece = video->ece.regmap;
+	unsigned int offset;
+
+	regmap_read(ece, ECE_HEX_RECT_OFFSET, &offset);
+	return FIELD_GET(ECE_HEX_RECT_OFFSET_MASK, offset);
+}
+
+/*
+ * Set the line pitch (in bytes) for the frame buffers.
+ * Can be on of those values: 512, 1024, 2048, 2560 or 4096 bytes.
+ */
+static void npcm_video_ece_set_lp(struct npcm_video *video, unsigned int pitch)
+{
+	struct regmap *ece = video->ece.regmap;
+	unsigned int lp;
+
+	switch (pitch) {
+	case 512:
+		lp = ECE_RESOL_FB_LP_512;
+		break;
+	case 1024:
+		lp = ECE_RESOL_FB_LP_1024;
+		break;
+	case 2048:
+		lp = ECE_RESOL_FB_LP_2048;
+		break;
+	case 2560:
+		lp = ECE_RESOL_FB_LP_2560;
+		break;
+	case 4096:
+		lp = ECE_RESOL_FB_LP_4096;
+		break;
+	default:
+		return;
+	}
+
+	regmap_write(ece, ECE_RESOL, lp);
+}
+
+static inline void npcm_video_ece_set_fb_addr(struct npcm_video *video,
+					      unsigned int buffer)
+{
+	struct regmap *ece = video->ece.regmap;
+
+	regmap_write(ece, ECE_FBR_BA, buffer);
+}
+
+static inline void npcm_video_ece_set_enc_dba(struct npcm_video *video,
+					      unsigned int addr)
+{
+	struct regmap *ece = video->ece.regmap;
+
+	regmap_write(ece, ECE_ED_BA, addr);
+}
+
+static inline void npcm_video_ece_clear_rect_offset(struct npcm_video *video)
+{
+	struct regmap *ece = video->ece.regmap;
+
+	regmap_write(ece, ECE_HEX_RECT_OFFSET, 0);
+}
+
+static void npcm_video_ece_ctrl_reset(struct npcm_video *video)
+{
+	struct regmap *ece = video->ece.regmap;
+
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, 0);
+	regmap_update_bits(ece, ECE_HEX_CTRL, ECE_HEX_CTRL_ENCDIS, ECE_HEX_CTRL_ENCDIS);
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, ECE_DDA_CTRL_ECEEN);
+	regmap_update_bits(ece, ECE_HEX_CTRL, ECE_HEX_CTRL_ENCDIS, 0);
+
+	npcm_video_ece_clear_rect_offset(video);
+}
+
+static void npcm_video_ece_ip_reset(struct npcm_video *video)
+{
+	/*
+	 * After resetting a module and clearing the reset bit, it should wait
+	 * at least 10 us before accessing the module.
+	 */
+	reset_control_assert(video->ece.reset);
+	usleep_range(10, 20);
+	reset_control_deassert(video->ece.reset);
+	usleep_range(10, 20);
+}
+
+static void npcm_video_ece_stop(struct npcm_video *video)
+{
+	struct regmap *ece = video->ece.regmap;
+
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_ECEEN, 0);
+	regmap_update_bits(ece, ECE_DDA_CTRL, ECE_DDA_CTRL_INTEN, 0);
+	regmap_update_bits(ece, ECE_HEX_CTRL, ECE_HEX_CTRL_ENCDIS, ECE_HEX_CTRL_ENCDIS);
+	npcm_video_ece_clear_rect_offset(video);
+}
+
+static bool npcm_video_alloc_fb(struct npcm_video *video,
+				struct npcm_video_addr *addr)
+{
+	addr->virt = dma_alloc_coherent(video->dev, VCD_FB_SIZE, &addr->dma,
+					GFP_KERNEL);
+	if (!addr->virt)
+		return false;
+
+	addr->size = VCD_FB_SIZE;
+	return true;
+}
+
+static void npcm_video_free_fb(struct npcm_video *video,
+			       struct npcm_video_addr *addr)
+{
+	dma_free_coherent(video->dev, addr->size, addr->virt, addr->dma);
+	addr->size = 0;
+	addr->dma = 0ULL;
+	addr->virt = NULL;
+}
+
+static void npcm_video_free_diff_table(struct npcm_video *video)
+{
+	struct list_head *head, *pos, *nx;
+	struct rect_list *tmp;
+	unsigned int i;
+
+	for (i = 0; i < video->queue.num_buffers; i++) {
+		head = &video->list[i];
+		list_for_each_safe(pos, nx, head) {
+			tmp = list_entry(pos, struct rect_list, list);
+			list_del(&tmp->list);
+			kfree(tmp);
+		}
+	}
+}
+
+static unsigned int npcm_video_add_rect(struct npcm_video *video,
+					unsigned int index,
+					unsigned int x, unsigned int y,
+					unsigned int w, unsigned int h)
+{
+	struct list_head *head = &video->list[index];
+	struct rect_list *list = NULL;
+	struct v4l2_rect *r;
+
+	list = kzalloc(sizeof(*list), GFP_KERNEL);
+	if (!list)
+		return 0;
+
+	r = &list->clip.c;
+	r->left = x;
+	r->top = y;
+	r->width = w;
+	r->height = h;
+
+	list_add_tail(&list->list, head);
+	return 1;
+}
+
+static void npcm_video_merge_rect(struct npcm_video *video,
+				  struct rect_list_info *info)
+{
+	struct list_head *head = info->head;
+	struct rect_list *list = info->list, *first = info->first;
+	struct v4l2_rect *r = &list->clip.c, *f = &first->clip.c;
+
+	if (!first) {
+		first = list;
+		info->first = first;
+		list_add_tail(&list->list, head);
+		video->rect_cnt++;
+	} else {
+		if ((r->left == (f->left + f->width)) && r->top == f->top) {
+			f->width += r->width;
+			kfree(list);
+		} else if ((r->top == (f->top + f->height)) &&
+			   (r->left == f->left)) {
+			f->height += r->height;
+			kfree(list);
+		} else if (((r->top > f->top) &&
+			   (r->top < (f->top + f->height))) &&
+			   ((r->left > f->left) &&
+			   (r->left < (f->left + f->width)))) {
+			kfree(list);
+		} else {
+			list_add_tail(&list->list, head);
+			video->rect_cnt++;
+			info->first = list;
+		}
+	}
+}
+
+static struct rect_list *npcm_video_new_rect(struct npcm_video *video,
+					     unsigned int offset,
+					     unsigned int index)
+{
+	struct v4l2_bt_timings *act = &video->active_timings;
+	struct rect_list *list = NULL;
+	struct v4l2_rect *r;
+
+	list = kzalloc(sizeof(*list), GFP_KERNEL);
+	if (!list)
+		return NULL;
+
+	r = &list->clip.c;
+
+	r->left = (offset << 4);
+	r->top = (index >> 2);
+	r->width = RECT_W;
+	r->height = RECT_H;
+	if ((r->left + RECT_W) > act->width)
+		r->width = act->width - r->left;
+	if ((r->top + RECT_H) > act->height)
+		r->height = act->height - r->top;
+
+	return list;
+}
+
+static int npcm_video_find_rect(struct npcm_video *video,
+				struct rect_list_info *info,
+				unsigned int offset)
+{
+	if (offset < info->tile_perline) {
+		info->list = npcm_video_new_rect(video, offset, info->index);
+		if (!info->list) {
+			dev_err(video->dev, "Failed to allocate rect_list\n");
+			return -ENOMEM;
+		}
+
+		npcm_video_merge_rect(video, info);
+	}
+	return 0;
+}
+
+static int npcm_video_build_table(struct npcm_video *video,
+				  struct rect_list_info *info)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	unsigned int j, bit, value;
+	int ret;
+
+	for (j = 0; j < info->offset_perline; j += 4) {
+		regmap_read(vcd, VCD_DIFF_TBL + (j + info->index), &value);
+
+		bitmap_from_arr32(bitmap, &value, BITMAP_SIZE);
+
+		for_each_set_bit(bit, bitmap, BITMAP_SIZE) {
+			ret = npcm_video_find_rect(video, info, bit + (j << 3));
+			if (ret)
+				return ret;
+		}
+	}
+	info->index += 64;
+	return info->tile_perline;
+}
+
+static void npcm_video_get_rect_list(struct npcm_video *video, unsigned int index)
+{
+	struct v4l2_bt_timings *act = &video->active_timings;
+	struct rect_list_info info;
+	unsigned int tile_cnt = 0, mod;
+	int ret = 0;
+
+	memset(&info, 0, sizeof(struct rect_list_info));
+	info.head = &video->list[index];
+
+	info.tile_perline = act->width >> 4;
+	mod = act->width % RECT_W;
+	if (mod != 0)
+		info.tile_perline += 1;
+
+	info.tile_perrow = act->height >> 4;
+	mod = act->height % RECT_H;
+	if (mod != 0)
+		info.tile_perrow += 1;
+
+	info.tile_size = info.tile_perrow * info.tile_perline;
+
+	info.offset_perline = info.tile_perline >> 5;
+	mod = info.tile_perline % 32;
+	if (mod != 0)
+		info.offset_perline += 1;
+
+	info.offset_perline *= 4;
+
+	do {
+		ret = npcm_video_build_table(video, &info);
+		if (ret < 0)
+			return;
+
+		tile_cnt += ret;
+	} while (tile_cnt < info.tile_size);
+}
+
+static unsigned int npcm_video_is_mga(struct npcm_video *video)
+{
+	struct regmap *gfxi = video->gfx_regmap;
+	unsigned int dispst;
+
+	regmap_read(gfxi, DISPST, &dispst);
+	return ((dispst & DISPST_MGAMODE) == DISPST_MGAMODE);
+}
+
+static unsigned int npcm_video_hres(struct npcm_video *video)
+{
+	struct regmap *gfxi = video->gfx_regmap;
+	unsigned int hvcnth, hvcntl, apb_hor_res;
+
+	regmap_read(gfxi, HVCNTH, &hvcnth);
+	regmap_read(gfxi, HVCNTL, &hvcntl);
+	apb_hor_res = (((hvcnth & HVCNTH_MASK) << 8) + (hvcntl & HVCNTL_MASK) + 1);
+
+	return apb_hor_res;
+}
+
+static unsigned int npcm_video_vres(struct npcm_video *video)
+{
+	struct regmap *gfxi = video->gfx_regmap;
+	unsigned int vvcnth, vvcntl, apb_ver_res;
+
+	regmap_read(gfxi, VVCNTH, &vvcnth);
+	regmap_read(gfxi, VVCNTL, &vvcntl);
+
+	apb_ver_res = (((vvcnth & VVCNTH_MASK) << 8) + (vvcntl & VVCNTL_MASK));
+
+	return apb_ver_res;
+}
+
+static int npcm_video_capres(struct npcm_video *video, unsigned int hor_res,
+			     unsigned int vert_res)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	unsigned int res, cap_res;
+
+	if (hor_res > MAX_WIDTH || vert_res > MAX_HEIGHT)
+		return -EINVAL;
+
+	res = FIELD_PREP(VCD_CAP_RES_VERT_RES, vert_res) |
+	      FIELD_PREP(VCD_CAP_RES_HOR_RES, hor_res);
+
+	regmap_write(vcd, VCD_CAP_RES, res);
+	regmap_read(vcd, VCD_CAP_RES, &cap_res);
+
+	if (cap_res != res)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void npcm_video_vcd_ip_reset(struct npcm_video *video)
+{
+	/*
+	 * After resetting a module and clearing the reset bit, it should wait
+	 * at least 10 us before accessing the module.
+	 */
+	reset_control_assert(video->reset);
+	usleep_range(10, 20);
+	reset_control_deassert(video->reset);
+	usleep_range(10, 20);
+}
+
+static void npcm_video_vcd_state_machine_reset(struct npcm_video *video)
+{
+	struct regmap *vcd = video->vcd_regmap;
+
+	regmap_update_bits(vcd, VCD_MODE, VCD_MODE_VCDE, 0);
+	regmap_update_bits(vcd, VCD_MODE, VCD_MODE_IDBC, 0);
+	regmap_update_bits(vcd, VCD_CMD, VCD_CMD_RST, VCD_CMD_RST);
+
+	/*
+	 * VCD_CMD_RST will reset VCD internal state machines and clear FIFOs,
+	 * it should wait at least 800 us for the reset operations completed.
+	 */
+	usleep_range(800, 1000);
+
+	regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+	regmap_update_bits(vcd, VCD_MODE, VCD_MODE_VCDE, VCD_MODE_VCDE);
+	regmap_update_bits(vcd, VCD_MODE, VCD_MODE_IDBC, VCD_MODE_IDBC);
+}
+
+static void npcm_video_gfx_reset(struct npcm_video *video)
+{
+	struct regmap *gcr = video->gcr_regmap;
+
+	regmap_update_bits(gcr, INTCR2, INTCR2_GIRST2, INTCR2_GIRST2);
+	npcm_video_vcd_state_machine_reset(video);
+	regmap_update_bits(gcr, INTCR2, INTCR2_GIRST2, 0);
+}
+
+static void npcm_video_kvm_bw(struct npcm_video *video, bool set_bw)
+{
+	struct regmap *vcd = video->vcd_regmap;
+
+	if (set_bw || !npcm_video_is_mga(video))
+		regmap_update_bits(vcd, VCD_MODE, VCD_MODE_KVM_BW_SET,
+				   VCD_MODE_KVM_BW_SET);
+	else
+		regmap_update_bits(vcd, VCD_MODE, VCD_MODE_KVM_BW_SET, 0);
+}
+
+static unsigned int npcm_video_pclk(struct npcm_video *video)
+{
+	struct regmap *gfxi = video->gfx_regmap;
+	unsigned int tmp, pllfbdiv, pllinotdiv, gpllfbdiv;
+	unsigned int gpllfbdv109, gpllfbdv8, gpllindiv;
+	unsigned int gpllst_pllotdiv1, gpllst_pllotdiv2;
+
+	regmap_read(gfxi, GPLLST, &tmp);
+	gpllfbdv109 = FIELD_GET(GPLLST_GPLLFBDV109, tmp);
+	gpllst_pllotdiv1 = FIELD_GET(GPLLST_PLLOTDIV1, tmp);
+	gpllst_pllotdiv2 = FIELD_GET(GPLLST_PLLOTDIV2, tmp);
+
+	regmap_read(gfxi, GPLLINDIV, &tmp);
+	gpllfbdv8 = FIELD_GET(GPLLINDIV_GPLLFBDV8, tmp);
+	gpllindiv = FIELD_GET(GPLLINDIV_MASK, tmp);
+
+	regmap_read(gfxi, GPLLFBDIV, &tmp);
+	gpllfbdiv = FIELD_GET(GPLLFBDIV_MASK, tmp);
+
+	pllfbdiv = (512 * gpllfbdv109 + 256 * gpllfbdv8 + gpllfbdiv);
+	pllinotdiv = (gpllindiv * gpllst_pllotdiv1 * gpllst_pllotdiv2);
+	if (pllfbdiv == 0 || pllinotdiv == 0)
+		return 0;
+
+	return ((pllfbdiv * 25000) / pllinotdiv) * 1000;
+}
+
+static unsigned int npcm_video_get_bpp(struct npcm_video *video)
+{
+	const struct npcm_fmt *fmt;
+	unsigned int k;
+
+	for (k = 0; k < NUM_FORMATS; k++) {
+		fmt = &npcm_fmt_list[k];
+		if (fmt->fourcc == video->pix_fmt.pixelformat)
+			break;
+	}
+
+	return fmt->bpp;
+}
+
+/*
+ * Pitch must be a power of 2, >= linebytes,
+ * at least 512, and no more than 4096.
+ */
+static void npcm_video_set_linepitch(struct npcm_video *video,
+				     unsigned int linebytes)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	unsigned int pitch = MIN_LP;
+
+	while ((pitch < linebytes) && (pitch < MAX_LP))
+		pitch *= 2;
+
+	regmap_write(vcd, VCD_FB_LP, FIELD_PREP(VCD_FBA_LP, pitch) |
+		     FIELD_PREP(VCD_FBB_LP, pitch));
+}
+
+static unsigned int npcm_video_get_linepitch(struct npcm_video *video)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	unsigned int linepitch;
+
+	regmap_read(vcd, VCD_FB_LP, &linepitch);
+	return FIELD_GET(VCD_FBA_LP, linepitch);
+}
+
+static void npcm_video_command(struct npcm_video *video, unsigned int value)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	unsigned int cmd;
+
+	regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+	regmap_read(vcd, VCD_CMD, &cmd);
+	cmd |= FIELD_PREP(VCD_CMD_OPERATION, value);
+
+	regmap_write(vcd, VCD_CMD, cmd);
+	regmap_update_bits(vcd, VCD_CMD, VCD_CMD_GO, VCD_CMD_GO);
+	video->op_cmd = value;
+}
+
+static void npcm_video_init_reg(struct npcm_video *video)
+{
+	struct regmap *gcr = video->gcr_regmap, *vcd = video->vcd_regmap;
+
+	/* Selects Data Enable */
+	regmap_update_bits(gcr, INTCR, INTCR_DEHS, 0);
+
+	/* Enable display of KVM GFX and access to memory */
+	regmap_update_bits(gcr, INTCR, INTCR_GFXIFDIS, 0);
+
+	/* Active Vertical/Horizontal Counters Reset */
+	regmap_update_bits(gcr, INTCR2, INTCR2_GIHCRST | INTCR2_GIVCRST,
+			   INTCR2_GIHCRST | INTCR2_GIVCRST);
+
+	/* Reset video modules */
+	npcm_video_vcd_ip_reset(video);
+	npcm_video_gfx_reset(video);
+
+	/* Set the FIFO thresholds */
+	regmap_write(vcd, VCD_FIFO, VCD_FIFO_TH);
+
+	/* Set RCHG timer */
+	regmap_write(vcd, VCD_RCHG, FIELD_PREP(VCD_RCHG_TIM_PRSCL, 0xf) |
+		     FIELD_PREP(VCD_RCHG_IG_CHG0, 0x3));
+
+	/* Set video mode */
+	regmap_write(vcd, VCD_MODE, VCD_MODE_VCDE | VCD_MODE_CM565 |
+		     VCD_MODE_IDBC | VCD_MODE_KVM_BW_SET);
+}
+
+static int npcm_video_start_frame(struct npcm_video *video)
+{
+	struct npcm_video_buffer *buf;
+	struct regmap *vcd = video->vcd_regmap;
+	unsigned long flags;
+	unsigned int val;
+	int ret;
+
+	if (video->v4l2_input_status) {
+		dev_dbg(video->dev, "No video signal; skip capture frame\n");
+		return 0;
+	}
+
+	ret = regmap_read_poll_timeout(vcd, VCD_STAT, val, !(val & VCD_STAT_BUSY),
+				       1000, VCD_TIMEOUT_US);
+	if (ret) {
+		dev_err(video->dev, "Wait for VCD_STAT_BUSY timeout\n");
+		return -EBUSY;
+	}
+
+	spin_lock_irqsave(&video->lock, flags);
+	buf = list_first_entry_or_null(&video->buffers,
+				       struct npcm_video_buffer, link);
+	if (!buf) {
+		spin_unlock_irqrestore(&video->lock, flags);
+		dev_dbg(video->dev, "No empty buffers; skip capture frame\n");
+		return 0;
+	}
+
+	set_bit(VIDEO_CAPTURING, &video->flags);
+	spin_unlock_irqrestore(&video->lock, flags);
+
+	npcm_video_vcd_state_machine_reset(video);
+
+	regmap_read(vcd, VCD_HOR_AC_TIM, &val);
+	regmap_update_bits(vcd, VCD_HOR_AC_LST, VCD_HOR_AC_LAST,
+			   FIELD_GET(VCD_HOR_AC_TIME, val));
+
+	regmap_read(vcd, VCD_VER_HI_TIM, &val);
+	regmap_update_bits(vcd, VCD_VER_HI_LST, VCD_VER_HI_LAST,
+			   FIELD_GET(VCD_VER_HI_TIME, val));
+
+	regmap_update_bits(vcd, VCD_INTE, VCD_INTE_DONE_IE | VCD_INTE_IFOT_IE |
+			   VCD_INTE_IFOR_IE | VCD_INTE_HAC_IE | VCD_INTE_VHT_IE,
+			   VCD_INTE_DONE_IE | VCD_INTE_IFOT_IE | VCD_INTE_IFOR_IE |
+			   VCD_INTE_HAC_IE | VCD_INTE_VHT_IE);
+
+	npcm_video_command(video, video->ctrl_cmd);
+
+	return 0;
+}
+
+static void npcm_video_bufs_done(struct npcm_video *video,
+				 enum vb2_buffer_state state)
+{
+	struct npcm_video_buffer *buf;
+	unsigned long flags;
+
+	spin_lock_irqsave(&video->lock, flags);
+	list_for_each_entry(buf, &video->buffers, link)
+		vb2_buffer_done(&buf->vb.vb2_buf, state);
+
+	INIT_LIST_HEAD(&video->buffers);
+	spin_unlock_irqrestore(&video->lock, flags);
+}
+
+static void npcm_video_get_diff_rect(struct npcm_video *video, unsigned int index)
+{
+	unsigned int width = video->active_timings.width;
+	unsigned int height = video->active_timings.height;
+
+	if (video->op_cmd != VCD_CMD_OPERATION_CAPTURE) {
+		video->rect_cnt = 0;
+		npcm_video_get_rect_list(video, index);
+		video->rect[index] = video->rect_cnt;
+	} else {
+		video->rect[index] = npcm_video_add_rect(video, index, 0, 0,
+							 width, height);
+	}
+}
+
+static void npcm_video_detect_resolution(struct npcm_video *video)
+{
+	struct v4l2_bt_timings *act = &video->active_timings;
+	struct v4l2_bt_timings *det = &video->detected_timings;
+	struct regmap *gfxi = video->gfx_regmap;
+	unsigned int dispst;
+
+	video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
+	det->width = npcm_video_hres(video);
+	det->height = npcm_video_vres(video);
+
+	if (act->width != det->width || act->height != det->height) {
+		dev_dbg(video->dev, "Resolution changed\n");
+
+		if (npcm_video_hres(video) > 0 && npcm_video_vres(video) > 0) {
+			if (test_bit(VIDEO_STREAMING, &video->flags)) {
+				/*
+				 * Wait for resolution is available,
+				 * and it is also captured by host.
+				 */
+				do {
+					mdelay(100);
+					regmap_read(gfxi, DISPST, &dispst);
+				} while (npcm_video_vres(video) < 100 ||
+					 npcm_video_pclk(video) == 0 ||
+					 (dispst & DISPST_HSCROFF));
+			}
+
+			det->width = npcm_video_hres(video);
+			det->height = npcm_video_vres(video);
+			det->pixelclock = npcm_video_pclk(video);
+		}
+
+		clear_bit(VIDEO_RES_CHANGING, &video->flags);
+	}
+
+	if (det->width && det->height)
+		video->v4l2_input_status = 0;
+
+	dev_dbg(video->dev, "Got resolution[%dx%d] -> [%dx%d], status %d\n",
+		act->width, act->height, det->width, det->height,
+		video->v4l2_input_status);
+}
+
+static int npcm_video_set_resolution(struct npcm_video *video,
+				     struct v4l2_bt_timings *timing)
+{
+	struct regmap *vcd = video->vcd_regmap;
+	unsigned int mode;
+
+	if (npcm_video_capres(video, timing->width, timing->height)) {
+		dev_err(video->dev, "Failed to set VCD_CAP_RES\n");
+		return -EINVAL;
+	}
+
+	video->active_timings = *timing;
+	video->bytesperpixel = npcm_video_get_bpp(video);
+	npcm_video_set_linepitch(video, timing->width * video->bytesperpixel);
+	video->bytesperline = npcm_video_get_linepitch(video);
+	video->pix_fmt.width = timing->width ? timing->width : MIN_WIDTH;
+	video->pix_fmt.height = timing->height ? timing->height : MIN_HEIGHT;
+	video->pix_fmt.sizeimage = video->pix_fmt.width * video->pix_fmt.height *
+				   video->bytesperpixel;
+	video->pix_fmt.bytesperline = video->bytesperline;
+
+	npcm_video_kvm_bw(video, timing->pixelclock > VCD_KVM_BW_PCLK);
+	npcm_video_gfx_reset(video);
+	regmap_read(vcd, VCD_MODE, &mode);
+
+	dev_dbg(video->dev, "VCD mode = 0x%x, %s mode\n", mode,
+		npcm_video_is_mga(video) ? "Hi Res" : "VGA");
+
+	dev_dbg(video->dev,
+		"Digital mode: %d x %d x %d, pixelclock %lld, bytesperline %d\n",
+		timing->width, timing->height, video->bytesperpixel,
+		timing->pixelclock, video->bytesperline);
+
+	return 0;
+}
+
+static void npcm_video_start(struct npcm_video *video)
+{
+	npcm_video_init_reg(video);
+
+	if (!npcm_video_alloc_fb(video, &video->src)) {
+		dev_err(video->dev, "Failed to allocate VCD frame buffer\n");
+		return;
+	}
+
+	npcm_video_detect_resolution(video);
+	if (npcm_video_set_resolution(video, &video->detected_timings)) {
+		dev_err(video->dev, "Failed to set resolution\n");
+		return;
+	}
+
+	/* Set frame buffer physical address */
+	regmap_write(video->vcd_regmap, VCD_FBA_ADR, video->src.dma);
+	regmap_write(video->vcd_regmap, VCD_FBB_ADR, video->src.dma);
+
+	if (video->ece.enable && atomic_inc_return(&video->ece.clients) == 1) {
+		npcm_video_ece_ip_reset(video);
+		npcm_video_ece_ctrl_reset(video);
+		npcm_video_ece_set_fb_addr(video, video->src.dma);
+		npcm_video_ece_set_lp(video, video->bytesperline);
+
+		dev_dbg(video->dev, "ECE open: client %d\n",
+			atomic_read(&video->ece.clients));
+	}
+}
+
+static void npcm_video_stop(struct npcm_video *video)
+{
+	struct regmap *vcd = video->vcd_regmap;
+
+	set_bit(VIDEO_STOPPED, &video->flags);
+
+	regmap_write(vcd, VCD_INTE, 0);
+	regmap_write(vcd, VCD_MODE, 0);
+	regmap_write(vcd, VCD_RCHG, 0);
+	regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+
+	if (video->src.size)
+		npcm_video_free_fb(video, &video->src);
+
+	npcm_video_free_diff_table(video);
+	video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
+	video->flags = 0;
+	video->ctrl_cmd = VCD_CMD_OPERATION_CAPTURE;
+
+	if (video->ece.enable && atomic_dec_return(&video->ece.clients) == 0) {
+		npcm_video_ece_stop(video);
+		dev_dbg(video->dev, "ECE close: client %d\n",
+			atomic_read(&video->ece.clients));
+	}
+}
+
+static unsigned int npcm_video_raw(struct npcm_video *video, int index, void *addr)
+{
+	unsigned int width = video->active_timings.width;
+	unsigned int height = video->active_timings.height;
+	unsigned int i, len, offset, bytes = 0;
+
+	video->rect[index] = npcm_video_add_rect(video, index, 0, 0, width, height);
+
+	for (i = 0; i < height; i++) {
+		len = width * video->bytesperpixel;
+		offset = i * video->bytesperline;
+
+		memcpy(addr + bytes, video->src.virt + offset, len);
+		bytes += len;
+	}
+
+	return bytes;
+}
+
+static unsigned int npcm_video_hextile(struct npcm_video *video, unsigned int index,
+				       unsigned int dma_addr, void *vaddr)
+{
+	struct rect_list *rect_list;
+	struct v4l2_rect *rect;
+	unsigned int offset, len, bytes = 0;
+
+	npcm_video_ece_ctrl_reset(video);
+	npcm_video_ece_clear_rect_offset(video);
+	npcm_video_ece_set_fb_addr(video, video->src.dma);
+
+	/* Set base address of encoded data to video buffer */
+	npcm_video_ece_set_enc_dba(video, dma_addr);
+
+	npcm_video_ece_set_lp(video, video->bytesperline);
+	npcm_video_get_diff_rect(video, index);
+
+	list_for_each_entry(rect_list, &video->list[index], list) {
+		rect = &rect_list->clip.c;
+		offset = npcm_video_ece_read_rect_offset(video);
+		npcm_video_ece_enc_rect(video, rect->left, rect->top,
+					rect->width, rect->height);
+
+		len = npcm_video_ece_get_ed_size(video, offset, vaddr);
+		npcm_video_ece_prepend_rect_header(vaddr + offset,
+						   rect->left, rect->top,
+						   rect->width, rect->height);
+		bytes += len;
+	}
+
+	return bytes;
+}
+
+static irqreturn_t npcm_video_irq(int irq, void *arg)
+{
+	struct npcm_video *video = arg;
+	struct regmap *vcd = video->vcd_regmap;
+	struct npcm_video_buffer *buf;
+	unsigned int index, size, status, fmt;
+	dma_addr_t dma_addr;
+	void *addr;
+	static const struct v4l2_event ev = {
+		.type = V4L2_EVENT_SOURCE_CHANGE,
+		.u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
+	};
+
+	regmap_read(vcd, VCD_STAT, &status);
+	dev_dbg(video->dev, "VCD irq status 0x%x\n", status);
+
+	regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+
+	if (test_bit(VIDEO_STOPPED, &video->flags) ||
+	    !test_bit(VIDEO_STREAMING, &video->flags))
+		return IRQ_NONE;
+
+	if (status & VCD_STAT_DONE) {
+		regmap_write(vcd, VCD_INTE, 0);
+		spin_lock(&video->lock);
+		clear_bit(VIDEO_CAPTURING, &video->flags);
+		buf = list_first_entry_or_null(&video->buffers,
+					       struct npcm_video_buffer, link);
+		if (!buf) {
+			spin_unlock(&video->lock);
+			return IRQ_NONE;
+		}
+
+		addr = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
+		index = buf->vb.vb2_buf.index;
+		fmt = video->pix_fmt.pixelformat;
+
+		switch (fmt) {
+		case V4L2_PIX_FMT_RGB565:
+			size = npcm_video_raw(video, index, addr);
+			break;
+		case V4L2_PIX_FMT_HEXTILE:
+			dma_addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
+			size = npcm_video_hextile(video, index, dma_addr, addr);
+			break;
+		default:
+			spin_unlock(&video->lock);
+			return IRQ_NONE;
+		}
+
+		vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
+		buf->vb.vb2_buf.timestamp = ktime_get_ns();
+		buf->vb.sequence = video->sequence++;
+		buf->vb.field = V4L2_FIELD_NONE;
+
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
+		list_del(&buf->link);
+		spin_unlock(&video->lock);
+
+		if (npcm_video_start_frame(video))
+			dev_err(video->dev, "Failed to capture next frame\n");
+	}
+
+	/* Resolution changed */
+	if (status & VCD_STAT_VHT_CHG || status & VCD_STAT_HAC_CHG) {
+		if (!test_bit(VIDEO_RES_CHANGING, &video->flags)) {
+			set_bit(VIDEO_RES_CHANGING, &video->flags);
+
+			vb2_queue_error(&video->queue);
+			v4l2_event_queue(&video->vdev, &ev);
+		}
+	}
+
+	if (status & VCD_STAT_IFOR || status & VCD_STAT_IFOT) {
+		dev_warn(video->dev, "VCD FIFO overrun or over thresholds\n");
+		if (npcm_video_start_frame(video))
+			dev_err(video->dev, "Failed to recover from FIFO overrun\n");
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int npcm_video_querycap(struct file *file, void *fh,
+			       struct v4l2_capability *cap)
+{
+	strscpy(cap->driver, DEVICE_NAME, sizeof(cap->driver));
+	strscpy(cap->card, "NPCM Video Engine", sizeof(cap->card));
+
+	return 0;
+}
+
+static int npcm_video_enum_format(struct file *file, void *fh,
+				  struct v4l2_fmtdesc *f)
+{
+	struct npcm_video *video = video_drvdata(file);
+	const struct npcm_fmt *fmt;
+
+	if (f->index >= NUM_FORMATS)
+		return -EINVAL;
+
+	fmt = &npcm_fmt_list[f->index];
+	if (fmt->fourcc == V4L2_PIX_FMT_HEXTILE && !video->ece.enable)
+		return -EINVAL;
+
+	f->pixelformat = fmt->fourcc;
+	return 0;
+}
+
+static int npcm_video_try_format(struct file *file, void *fh,
+				 struct v4l2_format *f)
+{
+	struct npcm_video *video = video_drvdata(file);
+	const struct npcm_fmt *fmt;
+
+	fmt = npcm_video_find_format(f);
+
+	/* If format not found or HEXTILE not supported, use RGB565 as default */
+	if (!fmt || (fmt->fourcc == V4L2_PIX_FMT_HEXTILE && !video->ece.enable))
+		f->fmt.pix.pixelformat = npcm_fmt_list[0].fourcc;
+
+	f->fmt.pix.field = V4L2_FIELD_NONE;
+	f->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
+	f->fmt.pix.quantization = V4L2_QUANTIZATION_FULL_RANGE;
+	f->fmt.pix.width = video->pix_fmt.width;
+	f->fmt.pix.height = video->pix_fmt.height;
+	f->fmt.pix.bytesperline = video->bytesperline;
+	f->fmt.pix.sizeimage = video->pix_fmt.sizeimage;
+
+	return 0;
+}
+
+static int npcm_video_get_format(struct file *file, void *fh,
+				 struct v4l2_format *f)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	f->fmt.pix = video->pix_fmt;
+	return 0;
+}
+
+static int npcm_video_set_format(struct file *file, void *fh,
+				 struct v4l2_format *f)
+{
+	struct npcm_video *video = video_drvdata(file);
+	int ret;
+
+	ret = npcm_video_try_format(file, fh, f);
+	if (ret)
+		return ret;
+
+	if (vb2_is_busy(&video->queue)) {
+		dev_err(video->dev, "%s device busy\n", __func__);
+		return -EBUSY;
+	}
+
+	video->pix_fmt.pixelformat = f->fmt.pix.pixelformat;
+	return 0;
+}
+
+static int npcm_video_enum_input(struct file *file, void *fh,
+				 struct v4l2_input *inp)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	if (inp->index)
+		return -EINVAL;
+
+	strscpy(inp->name, "Host VGA capture", sizeof(inp->name));
+	inp->type = V4L2_INPUT_TYPE_CAMERA;
+	inp->capabilities = V4L2_IN_CAP_DV_TIMINGS;
+	inp->status = video->v4l2_input_status;
+
+	return 0;
+}
+
+static int npcm_video_get_input(struct file *file, void *fh, unsigned int *i)
+{
+	*i = 0;
+
+	return 0;
+}
+
+static int npcm_video_set_input(struct file *file, void *fh, unsigned int i)
+{
+	if (i)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int npcm_video_set_dv_timings(struct file *file, void *fh,
+				     struct v4l2_dv_timings *timings)
+{
+	struct npcm_video *video = video_drvdata(file);
+	int rc;
+
+	if (timings->bt.width == video->active_timings.width &&
+	    timings->bt.height == video->active_timings.height)
+		return 0;
+
+	if (vb2_is_busy(&video->queue)) {
+		dev_err(video->dev, "%s device busy\n", __func__);
+		return -EBUSY;
+	}
+
+	rc = npcm_video_set_resolution(video, &timings->bt);
+	if (rc)
+		return rc;
+
+	timings->type = V4L2_DV_BT_656_1120;
+
+	return 0;
+}
+
+static int npcm_video_get_dv_timings(struct file *file, void *fh,
+				     struct v4l2_dv_timings *timings)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	timings->type = V4L2_DV_BT_656_1120;
+	timings->bt = video->active_timings;
+
+	return 0;
+}
+
+static int npcm_video_query_dv_timings(struct file *file, void *fh,
+				       struct v4l2_dv_timings *timings)
+{
+	struct npcm_video *video = video_drvdata(file);
+
+	npcm_video_detect_resolution(video);
+	timings->type = V4L2_DV_BT_656_1120;
+	timings->bt = video->detected_timings;
+
+	return video->v4l2_input_status ? -ENOLINK : 0;
+}
+
+static int npcm_video_enum_dv_timings(struct file *file, void *fh,
+				      struct v4l2_enum_dv_timings *timings)
+{
+	return v4l2_enum_dv_timings_cap(timings, &npcm_video_timings_cap,
+					NULL, NULL);
+}
+
+static int npcm_video_dv_timings_cap(struct file *file, void *fh,
+				     struct v4l2_dv_timings_cap *cap)
+{
+	*cap = npcm_video_timings_cap;
+
+	return 0;
+}
+
+static int npcm_video_sub_event(struct v4l2_fh *fh,
+				const struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_SOURCE_CHANGE:
+		return v4l2_src_change_event_subscribe(fh, sub);
+	}
+
+	return v4l2_ctrl_subscribe_event(fh, sub);
+}
+
+static const struct v4l2_ioctl_ops npcm_video_ioctls = {
+	.vidioc_querycap = npcm_video_querycap,
+
+	.vidioc_enum_fmt_vid_cap = npcm_video_enum_format,
+	.vidioc_g_fmt_vid_cap = npcm_video_get_format,
+	.vidioc_s_fmt_vid_cap = npcm_video_set_format,
+	.vidioc_try_fmt_vid_cap = npcm_video_try_format,
+
+	.vidioc_reqbufs = vb2_ioctl_reqbufs,
+	.vidioc_querybuf = vb2_ioctl_querybuf,
+	.vidioc_qbuf = vb2_ioctl_qbuf,
+	.vidioc_expbuf = vb2_ioctl_expbuf,
+	.vidioc_dqbuf = vb2_ioctl_dqbuf,
+	.vidioc_create_bufs = vb2_ioctl_create_bufs,
+	.vidioc_prepare_buf = vb2_ioctl_prepare_buf,
+	.vidioc_streamon = vb2_ioctl_streamon,
+	.vidioc_streamoff = vb2_ioctl_streamoff,
+
+	.vidioc_enum_input = npcm_video_enum_input,
+	.vidioc_g_input = npcm_video_get_input,
+	.vidioc_s_input = npcm_video_set_input,
+
+	.vidioc_s_dv_timings = npcm_video_set_dv_timings,
+	.vidioc_g_dv_timings = npcm_video_get_dv_timings,
+	.vidioc_query_dv_timings = npcm_video_query_dv_timings,
+	.vidioc_enum_dv_timings = npcm_video_enum_dv_timings,
+	.vidioc_dv_timings_cap = npcm_video_dv_timings_cap,
+
+	.vidioc_subscribe_event = npcm_video_sub_event,
+	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+};
+
+static int npcm_video_set_ctrl(struct v4l2_ctrl *ctrl)
+{
+	struct npcm_video *video = container_of(ctrl->handler, struct npcm_video,
+						ctrl_handler);
+
+	switch (ctrl->id) {
+	case V4L2_CID_NPCM_CAPTURE_MODE:
+		if (ctrl->val == V4L2_NPCM_CAPTURE_MODE_COMPLETE)
+			video->ctrl_cmd = VCD_CMD_OPERATION_CAPTURE;
+		else if (ctrl->val == V4L2_NPCM_CAPTURE_MODE_DIFF)
+			video->ctrl_cmd = VCD_CMD_OPERATION_COMPARE;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct v4l2_ctrl_ops npcm_video_ctrl_ops = {
+	.s_ctrl = npcm_video_set_ctrl,
+};
+
+static const char * const npcm_ctrl_capture_mode_menu[] = {
+	"COMPLETE",
+	"DIFF",
+	NULL,
+};
+
+static const struct v4l2_ctrl_config npcm_ctrl_capture_mode = {
+	.ops = &npcm_video_ctrl_ops,
+	.id = V4L2_CID_NPCM_CAPTURE_MODE,
+	.name = "NPCM Video Capture Mode",
+	.type = V4L2_CTRL_TYPE_MENU,
+	.min = 0,
+	.max = V4L2_NPCM_CAPTURE_MODE_DIFF,
+	.def = 0,
+	.qmenu = npcm_ctrl_capture_mode_menu,
+};
+
+/*
+ * This control value is set when a buffer is dequeued by userspace, i.e. in
+ * npcm_video_buf_finish function.
+ */
+static const struct v4l2_ctrl_config npcm_ctrl_rect_count = {
+	.id = V4L2_CID_NPCM_RECT_COUNT,
+	.name = "NPCM Hextile Rectangle Count",
+	.type = V4L2_CTRL_TYPE_INTEGER,
+	.min = 0,
+	.max = (MAX_WIDTH / RECT_W) * (MAX_HEIGHT / RECT_H),
+	.step = 1,
+	.def = 0,
+};
+
+static int npcm_video_open(struct file *file)
+{
+	struct npcm_video *video = video_drvdata(file);
+	int rc;
+
+	mutex_lock(&video->video_lock);
+	rc = v4l2_fh_open(file);
+	if (rc) {
+		mutex_unlock(&video->video_lock);
+		return rc;
+	}
+
+	if (v4l2_fh_is_singular_file(file))
+		npcm_video_start(video);
+
+	mutex_unlock(&video->video_lock);
+	return 0;
+}
+
+static int npcm_video_release(struct file *file)
+{
+	struct npcm_video *video = video_drvdata(file);
+	int rc;
+
+	mutex_lock(&video->video_lock);
+	if (v4l2_fh_is_singular_file(file))
+		npcm_video_stop(video);
+
+	rc = _vb2_fop_release(file, NULL);
+
+	mutex_unlock(&video->video_lock);
+	return rc;
+}
+
+static const struct v4l2_file_operations npcm_video_v4l2_fops = {
+	.owner = THIS_MODULE,
+	.read = vb2_fop_read,
+	.poll = vb2_fop_poll,
+	.unlocked_ioctl = video_ioctl2,
+	.mmap = vb2_fop_mmap,
+	.open = npcm_video_open,
+	.release = npcm_video_release,
+};
+
+static int npcm_video_queue_setup(struct vb2_queue *q, unsigned int *num_buffers,
+				  unsigned int *num_planes, unsigned int sizes[],
+				  struct device *alloc_devs[])
+{
+	struct npcm_video *video = vb2_get_drv_priv(q);
+	unsigned int i;
+
+	if (*num_planes) {
+		if (sizes[0] < video->pix_fmt.sizeimage)
+			return -EINVAL;
+
+		return 0;
+	}
+
+	*num_planes = 1;
+	sizes[0] = video->pix_fmt.sizeimage;
+
+	for (i = 0; i < VIDEO_MAX_FRAME; i++)
+		INIT_LIST_HEAD(&video->list[i]);
+
+	return 0;
+}
+
+static int npcm_video_buf_prepare(struct vb2_buffer *vb)
+{
+	struct npcm_video *video = vb2_get_drv_priv(vb->vb2_queue);
+
+	if (vb2_plane_size(vb, 0) < video->pix_fmt.sizeimage)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int npcm_video_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+	struct npcm_video *video = vb2_get_drv_priv(q);
+	int rc;
+
+	video->sequence = 0;
+	rc = npcm_video_start_frame(video);
+	if (rc) {
+		npcm_video_bufs_done(video, VB2_BUF_STATE_QUEUED);
+		return rc;
+	}
+
+	set_bit(VIDEO_STREAMING, &video->flags);
+	return 0;
+}
+
+static void npcm_video_stop_streaming(struct vb2_queue *q)
+{
+	struct npcm_video *video = vb2_get_drv_priv(q);
+	struct regmap *vcd = video->vcd_regmap;
+
+	clear_bit(VIDEO_STREAMING, &video->flags);
+	regmap_write(vcd, VCD_INTE, 0);
+	regmap_write(vcd, VCD_STAT, VCD_STAT_CLEAR);
+	npcm_video_gfx_reset(video);
+	npcm_video_bufs_done(video, VB2_BUF_STATE_ERROR);
+	video->ctrl_cmd = VCD_CMD_OPERATION_CAPTURE;
+	v4l2_ctrl_s_ctrl(video->rect_cnt_ctrl, 0);
+}
+
+static void npcm_video_buf_queue(struct vb2_buffer *vb)
+{
+	struct npcm_video *video = vb2_get_drv_priv(vb->vb2_queue);
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct npcm_video_buffer *nvb = to_npcm_video_buffer(vbuf);
+	unsigned long flags;
+	bool empty;
+
+	spin_lock_irqsave(&video->lock, flags);
+	empty = list_empty(&video->buffers);
+	list_add_tail(&nvb->link, &video->buffers);
+	spin_unlock_irqrestore(&video->lock, flags);
+
+	if (test_bit(VIDEO_STREAMING, &video->flags) &&
+	    !test_bit(VIDEO_CAPTURING, &video->flags) && empty) {
+		if (npcm_video_start_frame(video))
+			dev_err(video->dev, "Failed to capture next frame\n");
+	}
+}
+
+static void npcm_video_buf_finish(struct vb2_buffer *vb)
+{
+	struct npcm_video *video = vb2_get_drv_priv(vb->vb2_queue);
+	struct list_head *head, *pos, *nx;
+	struct rect_list *tmp;
+
+	/*
+	 * This callback is called when the buffer is dequeued, so update
+	 * V4L2_CID_NPCM_RECT_COUNT control value with the number of rectangles
+	 * in this buffer and free associated rect_list.
+	 */
+	if (test_bit(VIDEO_STREAMING, &video->flags)) {
+		v4l2_ctrl_s_ctrl(video->rect_cnt_ctrl, video->rect[vb->index]);
+
+		head = &video->list[vb->index];
+		list_for_each_safe(pos, nx, head) {
+			tmp = list_entry(pos, struct rect_list, list);
+			list_del(&tmp->list);
+			kfree(tmp);
+		}
+	}
+}
+
+static const struct regmap_config npcm_video_regmap_cfg = {
+	.reg_bits	= 32,
+	.reg_stride	= 4,
+	.val_bits	= 32,
+	.max_register	= VCD_FIFO,
+};
+
+static const struct regmap_config npcm_video_ece_regmap_cfg = {
+	.reg_bits	= 32,
+	.reg_stride	= 4,
+	.val_bits	= 32,
+	.max_register	= ECE_HEX_RECT_OFFSET,
+};
+
+static const struct vb2_ops npcm_video_vb2_ops = {
+	.queue_setup = npcm_video_queue_setup,
+	.wait_prepare = vb2_ops_wait_prepare,
+	.wait_finish = vb2_ops_wait_finish,
+	.buf_prepare = npcm_video_buf_prepare,
+	.buf_finish = npcm_video_buf_finish,
+	.start_streaming = npcm_video_start_streaming,
+	.stop_streaming = npcm_video_stop_streaming,
+	.buf_queue =  npcm_video_buf_queue,
+};
+
+static int npcm_video_setup_video(struct npcm_video *video)
+{
+	struct v4l2_device *v4l2_dev = &video->v4l2_dev;
+	struct video_device *vdev = &video->vdev;
+	struct vb2_queue *vbq = &video->queue;
+	int rc;
+
+	if (video->ece.enable)
+		video->pix_fmt.pixelformat = V4L2_PIX_FMT_HEXTILE;
+	else
+		video->pix_fmt.pixelformat = V4L2_PIX_FMT_RGB565;
+
+	video->pix_fmt.field = V4L2_FIELD_NONE;
+	video->pix_fmt.colorspace = V4L2_COLORSPACE_SRGB;
+	video->pix_fmt.quantization = V4L2_QUANTIZATION_FULL_RANGE;
+	video->v4l2_input_status = V4L2_IN_ST_NO_SIGNAL;
+
+	rc = v4l2_device_register(video->dev, v4l2_dev);
+	if (rc) {
+		dev_err(video->dev, "Failed to register v4l2 device\n");
+		return rc;
+	}
+
+	v4l2_ctrl_handler_init(&video->ctrl_handler, 2);
+	v4l2_ctrl_new_custom(&video->ctrl_handler, &npcm_ctrl_capture_mode, NULL);
+	video->rect_cnt_ctrl = v4l2_ctrl_new_custom(&video->ctrl_handler,
+						    &npcm_ctrl_rect_count, NULL);
+	if (video->ctrl_handler.error) {
+		dev_err(video->dev, "Failed to init controls: %d\n",
+			video->ctrl_handler.error);
+
+		rc = video->ctrl_handler.error;
+		goto rel_ctrl_handler;
+	}
+	v4l2_dev->ctrl_handler = &video->ctrl_handler;
+
+	vbq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+	vbq->io_modes = VB2_MMAP | VB2_DMABUF;
+	vbq->dev = v4l2_dev->dev;
+	vbq->lock = &video->video_lock;
+	vbq->ops = &npcm_video_vb2_ops;
+	vbq->mem_ops = &vb2_dma_contig_memops;
+	vbq->drv_priv = video;
+	vbq->buf_struct_size = sizeof(struct npcm_video_buffer);
+	vbq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	vbq->min_buffers_needed = 3;
+
+	rc = vb2_queue_init(vbq);
+	if (rc) {
+		dev_err(video->dev, "Failed to init vb2 queue\n");
+		goto rel_ctrl_handler;
+	}
+	vdev->queue = vbq;
+	vdev->fops = &npcm_video_v4l2_fops;
+	vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+	vdev->v4l2_dev = v4l2_dev;
+	strscpy(vdev->name, DEVICE_NAME, sizeof(vdev->name));
+	vdev->vfl_type = VFL_TYPE_VIDEO;
+	vdev->vfl_dir = VFL_DIR_RX;
+	vdev->release = video_device_release_empty;
+	vdev->ioctl_ops = &npcm_video_ioctls;
+	vdev->lock = &video->video_lock;
+
+	video_set_drvdata(vdev, video);
+	rc = video_register_device(vdev, VFL_TYPE_VIDEO, 0);
+	if (rc) {
+		dev_err(video->dev, "Failed to register video device\n");
+		goto rel_vb_queue;
+	}
+
+	return 0;
+
+rel_vb_queue:
+	vb2_queue_release(vbq);
+rel_ctrl_handler:
+	v4l2_ctrl_handler_free(&video->ctrl_handler);
+	v4l2_device_unregister(v4l2_dev);
+
+	return rc;
+}
+
+static int npcm_video_ece_init(struct npcm_video *video)
+{
+	struct device *dev = video->dev;
+	struct device_node *ece_node;
+	struct platform_device *ece_pdev;
+	void __iomem *regs;
+
+	ece_node = of_parse_phandle(video->dev->of_node, "nuvoton,ece", 0);
+	if (!ece_node) {
+		dev_err(dev, "Failed to get ECE phandle in DTS\n");
+		return -ENODEV;
+	}
+
+	video->ece.enable = of_device_is_available(ece_node);
+
+	if (video->ece.enable) {
+		dev_info(dev, "Support HEXTILE pixel format\n");
+
+		ece_pdev = of_find_device_by_node(ece_node);
+		if (IS_ERR(ece_pdev)) {
+			dev_err(dev, "Failed to find ECE device\n");
+			return PTR_ERR(ece_pdev);
+		}
+		of_node_put(ece_node);
+
+		regs = devm_platform_ioremap_resource(ece_pdev, 0);
+		if (IS_ERR(regs)) {
+			dev_err(dev, "Failed to parse ECE reg in DTS\n");
+			return PTR_ERR(regs);
+		}
+
+		video->ece.regmap = devm_regmap_init_mmio(dev, regs,
+							  &npcm_video_ece_regmap_cfg);
+		if (IS_ERR(video->ece.regmap)) {
+			dev_err(dev, "Failed to initialize ECE regmap\n");
+			return PTR_ERR(video->ece.regmap);
+		}
+
+		video->ece.reset = devm_reset_control_get(&ece_pdev->dev, NULL);
+		if (IS_ERR(video->ece.reset)) {
+			dev_err(dev, "Failed to get ECE reset control in DTS\n");
+			return PTR_ERR(video->ece.reset);
+		}
+	}
+
+	return 0;
+}
+
+static int npcm_video_init(struct npcm_video *video)
+{
+	struct device *dev = video->dev;
+	int irq, rc;
+
+	irq = irq_of_parse_and_map(dev->of_node, 0);
+	if (!irq) {
+		dev_err(dev, "Failed to find VCD IRQ\n");
+		return -ENODEV;
+	}
+
+	rc = devm_request_threaded_irq(dev, irq, NULL, npcm_video_irq,
+				       IRQF_ONESHOT, DEVICE_NAME, video);
+	if (rc < 0) {
+		dev_err(dev, "Failed to request IRQ %d\n", irq);
+		return rc;
+	}
+
+	of_reserved_mem_device_init(dev);
+	rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+	if (rc) {
+		dev_err(dev, "Failed to set DMA mask\n");
+		of_reserved_mem_device_release(dev);
+	}
+
+	rc = npcm_video_ece_init(video);
+	if (rc) {
+		dev_err(dev, "Failed to initialize ECE\n");
+		return rc;
+	}
+
+	return 0;
+}
+
+static int npcm_video_probe(struct platform_device *pdev)
+{
+	struct npcm_video *video = kzalloc(sizeof(*video), GFP_KERNEL);
+	int rc;
+	void __iomem *regs;
+
+	if (!video)
+		return -ENOMEM;
+
+	video->dev = &pdev->dev;
+	spin_lock_init(&video->lock);
+	mutex_init(&video->video_lock);
+	INIT_LIST_HEAD(&video->buffers);
+
+	regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(regs)) {
+		dev_err(&pdev->dev, "Failed to parse VCD reg in DTS\n");
+		return PTR_ERR(regs);
+	}
+
+	video->vcd_regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+						  &npcm_video_regmap_cfg);
+	if (IS_ERR(video->vcd_regmap)) {
+		dev_err(&pdev->dev, "Failed to initialize VCD regmap\n");
+		return PTR_ERR(video->vcd_regmap);
+	}
+
+	video->reset = devm_reset_control_get(&pdev->dev, NULL);
+	if (IS_ERR(video->reset)) {
+		dev_err(&pdev->dev, "Failed to get VCD reset control in DTS\n");
+		return PTR_ERR(video->reset);
+	}
+
+	video->gcr_regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+							    "nuvoton,sysgcr");
+	if (IS_ERR(video->gcr_regmap))
+		return PTR_ERR(video->gcr_regmap);
+
+	video->gfx_regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+							    "nuvoton,sysgfxi");
+	if (IS_ERR(video->gfx_regmap))
+		return PTR_ERR(video->gfx_regmap);
+
+	rc = npcm_video_init(video);
+	if (rc)
+		return rc;
+
+	rc = npcm_video_setup_video(video);
+	if (rc)
+		return rc;
+
+	dev_info(video->dev, "NPCM video driver probed\n");
+	return 0;
+}
+
+static int npcm_video_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+	struct npcm_video *video = to_npcm_video(v4l2_dev);
+
+	video_unregister_device(&video->vdev);
+	vb2_queue_release(&video->queue);
+	v4l2_ctrl_handler_free(&video->ctrl_handler);
+	v4l2_device_unregister(v4l2_dev);
+	if (video->ece.enable)
+		npcm_video_ece_stop(video);
+	of_reserved_mem_device_release(dev);
+
+	return 0;
+}
+
+static const struct of_device_id npcm_video_match[] = {
+	{ .compatible = "nuvoton,npcm750-vcd" },
+	{ .compatible = "nuvoton,npcm845-vcd" },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, npcm_video_match);
+
+static struct platform_driver npcm_video_driver = {
+	.driver = {
+		.name = DEVICE_NAME,
+		.of_match_table = npcm_video_match,
+	},
+	.probe = npcm_video_probe,
+	.remove = npcm_video_remove,
+};
+
+module_platform_driver(npcm_video_driver);
+
+MODULE_AUTHOR("Joseph Liu <kwliu@nuvoton.com>");
+MODULE_AUTHOR("Marvin Lin <kflin@nuvoton.com>");
+MODULE_DESCRIPTION("Driver for Nuvoton NPCM Video Capture/Encode Engine");
+MODULE_LICENSE("GPL v2");