drm/exynos: add gsc ipp driver

This patch adds IPP subsystem-based gsc driver for exynos5 series.
GSC is stand for General SCaler and supports the following features:
- image scaler/rotator/crop/flip/csc and input/output DMA operations.
- image rotation and image effect functions.
- writeback and display output operations.
- M2M operation to crop, scale, rotation and csc.

The below is GSC hardware path:
Memory------->GSC------>Memory
FIMD--------->GSC------>HDMI
FIMD--------->GSC------>Memory
Memory------->GSC------>FIMD, Mixer

This driver is registered to IPP subsystem framework to be used by user side
and user can control the GSC hardware through some interfaces of IPP subsystem
framework.

Changelog v1 ~ v5:
- added comments, code fixups and cleanups.

Signed-off-by: Eunchul Kim <chulspro.kim@samsung.com>
Signed-off-by: Jinyoung Jeon <jy0.jeon@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin.park <kyungmin.park@samsung.com>

1 files changed, 1870 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_gsc.c b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
new file mode 100644
index 00000000000..5639353d47b
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos_drm_gsc.c
@@ -0,0 +1,1870 @@
+/*
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd
+ * Authors:
+ *	Eunchul Kim <chulspro.kim@samsung.com>
+ *	Jinyoung Jeon <jy0.jeon@samsung.com>
+ *	Sangmin Lee <lsmin.lee@samsung.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/pm_runtime.h>
+#include <plat/map-base.h>
+
+#include <drm/drmP.h>
+#include <drm/exynos_drm.h>
+#include "regs-gsc.h"
+#include "exynos_drm_ipp.h"
+#include "exynos_drm_gsc.h"
+
+/*
+ * GSC is stand for General SCaler and
+ * supports image scaler/rotator and input/output DMA operations.
+ * input DMA reads image data from the memory.
+ * output DMA writes image data to memory.
+ * GSC supports image rotation and image effect functions.
+ *
+ * M2M operation : supports crop/scale/rotation/csc so on.
+ * Memory ----> GSC H/W ----> Memory.
+ * Writeback operation : supports cloned screen with FIMD.
+ * FIMD ----> GSC H/W ----> Memory.
+ * Output operation : supports direct display using local path.
+ * Memory ----> GSC H/W ----> FIMD, Mixer.
+ */
+
+/*
+ * TODO
+ * 1. check suspend/resume api if needed.
+ * 2. need to check use case platform_device_id.
+ * 3. check src/dst size with, height.
+ * 4. added check_prepare api for right register.
+ * 5. need to add supported list in prop_list.
+ * 6. check prescaler/scaler optimization.
+ */
+
+#define GSC_MAX_DEVS	4
+#define GSC_MAX_SRC		4
+#define GSC_MAX_DST		16
+#define GSC_RESET_TIMEOUT	50
+#define GSC_BUF_STOP	1
+#define GSC_BUF_START	2
+#define GSC_REG_SZ		16
+#define GSC_WIDTH_ITU_709	1280
+#define GSC_SC_UP_MAX_RATIO		65536
+#define GSC_SC_DOWN_RATIO_7_8		74898
+#define GSC_SC_DOWN_RATIO_6_8		87381
+#define GSC_SC_DOWN_RATIO_5_8		104857
+#define GSC_SC_DOWN_RATIO_4_8		131072
+#define GSC_SC_DOWN_RATIO_3_8		174762
+#define GSC_SC_DOWN_RATIO_2_8		262144
+#define GSC_REFRESH_MIN	12
+#define GSC_REFRESH_MAX	60
+#define GSC_CROP_MAX	8192
+#define GSC_CROP_MIN	32
+#define GSC_SCALE_MAX	4224
+#define GSC_SCALE_MIN	32
+#define GSC_COEF_RATIO	7
+#define GSC_COEF_PHASE	9
+#define GSC_COEF_ATTR	16
+#define GSC_COEF_H_8T	8
+#define GSC_COEF_V_4T	4
+#define GSC_COEF_DEPTH	3
+
+#define get_gsc_context(dev)	platform_get_drvdata(to_platform_device(dev))
+#define get_ctx_from_ippdrv(ippdrv)	container_of(ippdrv,\
+					struct gsc_context, ippdrv);
+#define gsc_read(offset)		readl(ctx->regs + (offset))
+#define gsc_write(cfg, offset)	writel(cfg, ctx->regs + (offset))
+
+/*
+ * A structure of scaler.
+ *
+ * @range: narrow, wide.
+ * @pre_shfactor: pre sclaer shift factor.
+ * @pre_hratio: horizontal ratio of the prescaler.
+ * @pre_vratio: vertical ratio of the prescaler.
+ * @main_hratio: the main scaler's horizontal ratio.
+ * @main_vratio: the main scaler's vertical ratio.
+ */
+struct gsc_scaler {
+	bool	range;
+	u32	pre_shfactor;
+	u32	pre_hratio;
+	u32	pre_vratio;
+	unsigned long main_hratio;
+	unsigned long main_vratio;
+};
+
+/*
+ * A structure of scaler capability.
+ *
+ * find user manual 49.2 features.
+ * @tile_w: tile mode or rotation width.
+ * @tile_h: tile mode or rotation height.
+ * @w: other cases width.
+ * @h: other cases height.
+ */
+struct gsc_capability {
+	/* tile or rotation */
+	u32	tile_w;
+	u32	tile_h;
+	/* other cases */
+	u32	w;
+	u32	h;
+};
+
+/*
+ * A structure of gsc context.
+ *
+ * @ippdrv: prepare initialization using ippdrv.
+ * @regs_res: register resources.
+ * @regs: memory mapped io registers.
+ * @lock: locking of operations.
+ * @gsc_clk: gsc gate clock.
+ * @sc: scaler infomations.
+ * @id: gsc id.
+ * @irq: irq number.
+ * @rotation: supports rotation of src.
+ * @suspended: qos operations.
+ */
+struct gsc_context {
+	struct exynos_drm_ippdrv	ippdrv;
+	struct resource	*regs_res;
+	void __iomem	*regs;
+	struct mutex	lock;
+	struct clk	*gsc_clk;
+	struct gsc_scaler	sc;
+	int	id;
+	int	irq;
+	bool	rotation;
+	bool	suspended;
+};
+
+/* 8-tap Filter Coefficient */
+static const int h_coef_8t[GSC_COEF_RATIO][GSC_COEF_ATTR][GSC_COEF_H_8T] = {
+	{	/* Ratio <= 65536 (~8:8) */
+		{  0,  0,   0, 128,   0,   0,  0,  0 },
+		{ -1,  2,  -6, 127,   7,  -2,  1,  0 },
+		{ -1,  4, -12, 125,  16,  -5,  1,  0 },
+		{ -1,  5, -15, 120,  25,  -8,  2,  0 },
+		{ -1,  6, -18, 114,  35, -10,  3, -1 },
+		{ -1,  6, -20, 107,  46, -13,  4, -1 },
+		{ -2,  7, -21,  99,  57, -16,  5, -1 },
+		{ -1,  6, -20,  89,  68, -18,  5, -1 },
+		{ -1,  6, -20,  79,  79, -20,  6, -1 },
+		{ -1,  5, -18,  68,  89, -20,  6, -1 },
+		{ -1,  5, -16,  57,  99, -21,  7, -2 },
+		{ -1,  4, -13,  46, 107, -20,  6, -1 },
+		{ -1,  3, -10,  35, 114, -18,  6, -1 },
+		{  0,  2,  -8,  25, 120, -15,  5, -1 },
+		{  0,  1,  -5,  16, 125, -12,  4, -1 },
+		{  0,  1,  -2,   7, 127,  -6,  2, -1 }
+	}, {	/* 65536 < Ratio <= 74898 (~8:7) */
+		{  3, -8,  14, 111,  13,  -8,  3,  0 },
+		{  2, -6,   7, 112,  21, -10,  3, -1 },
+		{  2, -4,   1, 110,  28, -12,  4, -1 },
+		{  1, -2,  -3, 106,  36, -13,  4, -1 },
+		{  1, -1,  -7, 103,  44, -15,  4, -1 },
+		{  1,  1, -11,  97,  53, -16,  4, -1 },
+		{  0,  2, -13,  91,  61, -16,  4, -1 },
+		{  0,  3, -15,  85,  69, -17,  4, -1 },
+		{  0,  3, -16,  77,  77, -16,  3,  0 },
+		{ -1,  4, -17,  69,  85, -15,  3,  0 },
+		{ -1,  4, -16,  61,  91, -13,  2,  0 },
+		{ -1,  4, -16,  53,  97, -11,  1,  1 },
+		{ -1,  4, -15,  44, 103,  -7, -1,  1 },
+		{ -1,  4, -13,  36, 106,  -3, -2,  1 },
+		{ -1,  4, -12,  28, 110,   1, -4,  2 },
+		{ -1,  3, -10,  21, 112,   7, -6,  2 }
+	}, {	/* 74898 < Ratio <= 87381 (~8:6) */
+		{ 2, -11,  25,  96, 25, -11,   2,  0 },
+		{ 2, -10,  19,  96, 31, -12,   2,  0 },
+		{ 2,  -9,  14,  94, 37, -12,   2,  0 },
+		{ 2,  -8,  10,  92, 43, -12,   1,  0 },
+		{ 2,  -7,   5,  90, 49, -12,   1,  0 },
+		{ 2,  -5,   1,  86, 55, -12,   0,  1 },
+		{ 2,  -4,  -2,  82, 61, -11,  -1,  1 },
+		{ 1,  -3,  -5,  77, 67,  -9,  -1,  1 },
+		{ 1,  -2,  -7,  72, 72,  -7,  -2,  1 },
+		{ 1,  -1,  -9,  67, 77,  -5,  -3,  1 },
+		{ 1,  -1, -11,  61, 82,  -2,  -4,  2 },
+		{ 1,   0, -12,  55, 86,   1,  -5,  2 },
+		{ 0,   1, -12,  49, 90,   5,  -7,  2 },
+		{ 0,   1, -12,  43, 92,  10,  -8,  2 },
+		{ 0,   2, -12,  37, 94,  14,  -9,  2 },
+		{ 0,   2, -12,  31, 96,  19, -10,  2 }
+	}, {	/* 87381 < Ratio <= 104857 (~8:5) */
+		{ -1,  -8, 33,  80, 33,  -8,  -1,  0 },
+		{ -1,  -8, 28,  80, 37,  -7,  -2,  1 },
+		{  0,  -8, 24,  79, 41,  -7,  -2,  1 },
+		{  0,  -8, 20,  78, 46,  -6,  -3,  1 },
+		{  0,  -8, 16,  76, 50,  -4,  -3,  1 },
+		{  0,  -7, 13,  74, 54,  -3,  -4,  1 },
+		{  1,  -7, 10,  71, 58,  -1,  -5,  1 },
+		{  1,  -6,  6,  68, 62,   1,  -5,  1 },
+		{  1,  -6,  4,  65, 65,   4,  -6,  1 },
+		{  1,  -5,  1,  62, 68,   6,  -6,  1 },
+		{  1,  -5, -1,  58, 71,  10,  -7,  1 },
+		{  1,  -4, -3,  54, 74,  13,  -7,  0 },
+		{  1,  -3, -4,  50, 76,  16,  -8,  0 },
+		{  1,  -3, -6,  46, 78,  20,  -8,  0 },
+		{  1,  -2, -7,  41, 79,  24,  -8,  0 },
+		{  1,  -2, -7,  37, 80,  28,  -8, -1 }
+	}, {	/* 104857 < Ratio <= 131072 (~8:4) */
+		{ -3,   0, 35,  64, 35,   0,  -3,  0 },
+		{ -3,  -1, 32,  64, 38,   1,  -3,  0 },
+		{ -2,  -2, 29,  63, 41,   2,  -3,  0 },
+		{ -2,  -3, 27,  63, 43,   4,  -4,  0 },
+		{ -2,  -3, 24,  61, 46,   6,  -4,  0 },
+		{ -2,  -3, 21,  60, 49,   7,  -4,  0 },
+		{ -1,  -4, 19,  59, 51,   9,  -4, -1 },
+		{ -1,  -4, 16,  57, 53,  12,  -4, -1 },
+		{ -1,  -4, 14,  55, 55,  14,  -4, -1 },
+		{ -1,  -4, 12,  53, 57,  16,  -4, -1 },
+		{ -1,  -4,  9,  51, 59,  19,  -4, -1 },
+		{  0,  -4,  7,  49, 60,  21,  -3, -2 },
+		{  0,  -4,  6,  46, 61,  24,  -3, -2 },
+		{  0,  -4,  4,  43, 63,  27,  -3, -2 },
+		{  0,  -3,  2,  41, 63,  29,  -2, -2 },
+		{  0,  -3,  1,  38, 64,  32,  -1, -3 }
+	}, {	/* 131072 < Ratio <= 174762 (~8:3) */
+		{ -1,   8, 33,  48, 33,   8,  -1,  0 },
+		{ -1,   7, 31,  49, 35,   9,  -1, -1 },
+		{ -1,   6, 30,  49, 36,  10,  -1, -1 },
+		{ -1,   5, 28,  48, 38,  12,  -1, -1 },
+		{ -1,   4, 26,  48, 39,  13,   0, -1 },
+		{ -1,   3, 24,  47, 41,  15,   0, -1 },
+		{ -1,   2, 23,  47, 42,  16,   0, -1 },
+		{ -1,   2, 21,  45, 43,  18,   1, -1 },
+		{ -1,   1, 19,  45, 45,  19,   1, -1 },
+		{ -1,   1, 18,  43, 45,  21,   2, -1 },
+		{ -1,   0, 16,  42, 47,  23,   2, -1 },
+		{ -1,   0, 15,  41, 47,  24,   3, -1 },
+		{ -1,   0, 13,  39, 48,  26,   4, -1 },
+		{ -1,  -1, 12,  38, 48,  28,   5, -1 },
+		{ -1,  -1, 10,  36, 49,  30,   6, -1 },
+		{ -1,  -1,  9,  35, 49,  31,   7, -1 }
+	}, {	/* 174762 < Ratio <= 262144 (~8:2) */
+		{  2,  13, 30,  38, 30,  13,   2,  0 },
+		{  2,  12, 29,  38, 30,  14,   3,  0 },
+		{  2,  11, 28,  38, 31,  15,   3,  0 },
+		{  2,  10, 26,  38, 32,  16,   4,  0 },
+		{  1,  10, 26,  37, 33,  17,   4,  0 },
+		{  1,   9, 24,  37, 34,  18,   5,  0 },
+		{  1,   8, 24,  37, 34,  19,   5,  0 },
+		{  1,   7, 22,  36, 35,  20,   6,  1 },
+		{  1,   6, 21,  36, 36,  21,   6,  1 },
+		{  1,   6, 20,  35, 36,  22,   7,  1 },
+		{  0,   5, 19,  34, 37,  24,   8,  1 },
+		{  0,   5, 18,  34, 37,  24,   9,  1 },
+		{  0,   4, 17,  33, 37,  26,  10,  1 },
+		{  0,   4, 16,  32, 38,  26,  10,  2 },
+		{  0,   3, 15,  31, 38,  28,  11,  2 },
+		{  0,   3, 14,  30, 38,  29,  12,  2 }
+	}
+};
+
+/* 4-tap Filter Coefficient */
+static const int v_coef_4t[GSC_COEF_RATIO][GSC_COEF_ATTR][GSC_COEF_V_4T] = {
+	{	/* Ratio <= 65536 (~8:8) */
+		{  0, 128,   0,  0 },
+		{ -4, 127,   5,  0 },
+		{ -6, 124,  11, -1 },
+		{ -8, 118,  19, -1 },
+		{ -8, 111,  27, -2 },
+		{ -8, 102,  37, -3 },
+		{ -8,  92,  48, -4 },
+		{ -7,  81,  59, -5 },
+		{ -6,  70,  70, -6 },
+		{ -5,  59,  81, -7 },
+		{ -4,  48,  92, -8 },
+		{ -3,  37, 102, -8 },
+		{ -2,  27, 111, -8 },
+		{ -1,  19, 118, -8 },
+		{ -1,  11, 124, -6 },
+		{  0,   5, 127, -4 }
+	}, {	/* 65536 < Ratio <= 74898 (~8:7) */
+		{  8, 112,   8,  0 },
+		{  4, 111,  14, -1 },
+		{  1, 109,  20, -2 },
+		{ -2, 105,  27, -2 },
+		{ -3, 100,  34, -3 },
+		{ -5,  93,  43, -3 },
+		{ -5,  86,  51, -4 },
+		{ -5,  77,  60, -4 },
+		{ -5,  69,  69, -5 },
+		{ -4,  60,  77, -5 },
+		{ -4,  51,  86, -5 },
+		{ -3,  43,  93, -5 },
+		{ -3,  34, 100, -3 },
+		{ -2,  27, 105, -2 },
+		{ -2,  20, 109,  1 },
+		{ -1,  14, 111,  4 }
+	}, {	/* 74898 < Ratio <= 87381 (~8:6) */
+		{ 16,  96,  16,  0 },
+		{ 12,  97,  21, -2 },
+		{  8,  96,  26, -2 },
+		{  5,  93,  32, -2 },
+		{  2,  89,  39, -2 },
+		{  0,  84,  46, -2 },
+		{ -1,  79,  53, -3 },
+		{ -2,  73,  59, -2 },
+		{ -2,  66,  66, -2 },
+		{ -2,  59,  73, -2 },
+		{ -3,  53,  79, -1 },
+		{ -2,  46,  84,  0 },
+		{ -2,  39,  89,  2 },
+		{ -2,  32,  93,  5 },
+		{ -2,  26,  96,  8 },
+		{ -2,  21,  97, 12 }
+	}, {	/* 87381 < Ratio <= 104857 (~8:5) */
+		{ 22,  84,  22,  0 },
+		{ 18,  85,  26, -1 },
+		{ 14,  84,  31, -1 },
+		{ 11,  82,  36, -1 },
+		{  8,  79,  42, -1 },
+		{  6,  76,  47, -1 },
+		{  4,  72,  52,  0 },
+		{  2,  68,  58,  0 },
+		{  1,  63,  63,  1 },
+		{  0,  58,  68,  2 },
+		{  0,  52,  72,  4 },
+		{ -1,  47,  76,  6 },
+		{ -1,  42,  79,  8 },
+		{ -1,  36,  82, 11 },
+		{ -1,  31,  84, 14 },
+		{ -1,  26,  85, 18 }
+	}, {	/* 104857 < Ratio <= 131072 (~8:4) */
+		{ 26,  76,  26,  0 },
+		{ 22,  76,  30,  0 },
+		{ 19,  75,  34,  0 },
+		{ 16,  73,  38,  1 },
+		{ 13,  71,  43,  1 },
+		{ 10,  69,  47,  2 },
+		{  8,  66,  51,  3 },
+		{  6,  63,  55,  4 },
+		{  5,  59,  59,  5 },
+		{  4,  55,  63,  6 },
+		{  3,  51,  66,  8 },
+		{  2,  47,  69, 10 },
+		{  1,  43,  71, 13 },
+		{  1,  38,  73, 16 },
+		{  0,  34,  75, 19 },
+		{  0,  30,  76, 22 }
+	}, {	/* 131072 < Ratio <= 174762 (~8:3) */
+		{ 29,  70,  29,  0 },
+		{ 26,  68,  32,  2 },
+		{ 23,  67,  36,  2 },
+		{ 20,  66,  39,  3 },
+		{ 17,  65,  43,  3 },
+		{ 15,  63,  46,  4 },
+		{ 12,  61,  50,  5 },
+		{ 10,  58,  53,  7 },
+		{  8,  56,  56,  8 },
+		{  7,  53,  58, 10 },
+		{  5,  50,  61, 12 },
+		{  4,  46,  63, 15 },
+		{  3,  43,  65, 17 },
+		{  3,  39,  66, 20 },
+		{  2,  36,  67, 23 },
+		{  2,  32,  68, 26 }
+	}, {	/* 174762 < Ratio <= 262144 (~8:2) */
+		{ 32,  64,  32,  0 },
+		{ 28,  63,  34,  3 },
+		{ 25,  62,  37,  4 },
+		{ 22,  62,  40,  4 },
+		{ 19,  61,  43,  5 },
+		{ 17,  59,  46,  6 },
+		{ 15,  58,  48,  7 },
+		{ 13,  55,  51,  9 },
+		{ 11,  53,  53, 11 },
+		{  9,  51,  55, 13 },
+		{  7,  48,  58, 15 },
+		{  6,  46,  59, 17 },
+		{  5,  43,  61, 19 },
+		{  4,  40,  62, 22 },
+		{  4,  37,  62, 25 },
+		{  3,  34,  63, 28 }
+	}
+};
+
+static int gsc_sw_reset(struct gsc_context *ctx)
+{
+	u32 cfg;
+	int count = GSC_RESET_TIMEOUT;
+
+	DRM_DEBUG_KMS("%s\n", __func__);
+
+	/* s/w reset */
+	cfg = (GSC_SW_RESET_SRESET);
+	gsc_write(cfg, GSC_SW_RESET);
+
+	/* wait s/w reset complete */
+	while (count--) {
+		cfg = gsc_read(GSC_SW_RESET);
+		if (!cfg)
+			break;
+		usleep_range(1000, 2000);
+	}
+
+	if (cfg) {
+		DRM_ERROR("failed to reset gsc h/w.\n");
+		return -EBUSY;
+	}
+
+	/* reset sequence */
+	cfg = gsc_read(GSC_IN_BASE_ADDR_Y_MASK);
+	cfg |= (GSC_IN_BASE_ADDR_MASK |
+		GSC_IN_BASE_ADDR_PINGPONG(0));
+	gsc_write(cfg, GSC_IN_BASE_ADDR_Y_MASK);
+	gsc_write(cfg, GSC_IN_BASE_ADDR_CB_MASK);
+	gsc_write(cfg, GSC_IN_BASE_ADDR_CR_MASK);
+
+	cfg = gsc_read(GSC_OUT_BASE_ADDR_Y_MASK);
+	cfg |= (GSC_OUT_BASE_ADDR_MASK |
+		GSC_OUT_BASE_ADDR_PINGPONG(0));
+	gsc_write(cfg, GSC_OUT_BASE_ADDR_Y_MASK);
+	gsc_write(cfg, GSC_OUT_BASE_ADDR_CB_MASK);
+	gsc_write(cfg, GSC_OUT_BASE_ADDR_CR_MASK);
+
+	return 0;
+}
+
+static void gsc_set_gscblk_fimd_wb(struct gsc_context *ctx, bool enable)
+{
+	u32 gscblk_cfg;
+
+	DRM_DEBUG_KMS("%s\n", __func__);
+
+	gscblk_cfg = readl(SYSREG_GSCBLK_CFG1);
+
+	if (enable)
+		gscblk_cfg |= GSC_BLK_DISP1WB_DEST(ctx->id) |
+				GSC_BLK_GSCL_WB_IN_SRC_SEL(ctx->id) |
+				GSC_BLK_SW_RESET_WB_DEST(ctx->id);
+	else
+		gscblk_cfg |= GSC_BLK_PXLASYNC_LO_MASK_WB(ctx->id);
+
+	writel(gscblk_cfg, SYSREG_GSCBLK_CFG1);
+}
+
+static void gsc_handle_irq(struct gsc_context *ctx, bool enable,
+		bool overflow, bool done)
+{
+	u32 cfg;
+
+	DRM_DEBUG_KMS("%s:enable[%d]overflow[%d]level[%d]\n", __func__,
+			enable, overflow, done);
+
+	cfg = gsc_read(GSC_IRQ);
+	cfg |= (GSC_IRQ_OR_MASK | GSC_IRQ_FRMDONE_MASK);
+
+	if (enable)
+		cfg |= GSC_IRQ_ENABLE;
+	else
+		cfg &= ~GSC_IRQ_ENABLE;
+
+	if (overflow)
+		cfg &= ~GSC_IRQ_OR_MASK;
+	else
+		cfg |= GSC_IRQ_OR_MASK;
+
+	if (done)
+		cfg &= ~GSC_IRQ_FRMDONE_MASK;
+	else
+		cfg |= GSC_IRQ_FRMDONE_MASK;
+
+	gsc_write(cfg, GSC_IRQ);
+}
+
+
+static int gsc_src_set_fmt(struct device *dev, u32 fmt)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	u32 cfg;
+
+	DRM_DEBUG_KMS("%s:fmt[0x%x]\n", __func__, fmt);
+
+	cfg = gsc_read(GSC_IN_CON);
+	cfg &= ~(GSC_IN_RGB_TYPE_MASK | GSC_IN_YUV422_1P_ORDER_MASK |
+		 GSC_IN_CHROMA_ORDER_MASK | GSC_IN_FORMAT_MASK |
+		 GSC_IN_TILE_TYPE_MASK | GSC_IN_TILE_MODE |
+		 GSC_IN_CHROM_STRIDE_SEL_MASK | GSC_IN_RB_SWAP_MASK);
+
+	switch (fmt) {
+	case DRM_FORMAT_RGB565:
+		cfg |= GSC_IN_RGB565;
+		break;
+	case DRM_FORMAT_XRGB8888:
+		cfg |= GSC_IN_XRGB8888;
+		break;
+	case DRM_FORMAT_BGRX8888:
+		cfg |= (GSC_IN_XRGB8888 | GSC_IN_RB_SWAP);
+		break;
+	case DRM_FORMAT_YUYV:
+		cfg |= (GSC_IN_YUV422_1P |
+			GSC_IN_YUV422_1P_ORDER_LSB_Y |
+			GSC_IN_CHROMA_ORDER_CBCR);
+		break;
+	case DRM_FORMAT_YVYU:
+		cfg |= (GSC_IN_YUV422_1P |
+			GSC_IN_YUV422_1P_ORDER_LSB_Y |
+			GSC_IN_CHROMA_ORDER_CRCB);
+		break;
+	case DRM_FORMAT_UYVY:
+		cfg |= (GSC_IN_YUV422_1P |
+			GSC_IN_YUV422_1P_OEDER_LSB_C |
+			GSC_IN_CHROMA_ORDER_CBCR);
+		break;
+	case DRM_FORMAT_VYUY:
+		cfg |= (GSC_IN_YUV422_1P |
+			GSC_IN_YUV422_1P_OEDER_LSB_C |
+			GSC_IN_CHROMA_ORDER_CRCB);
+		break;
+	case DRM_FORMAT_NV21:
+	case DRM_FORMAT_NV61:
+		cfg |= (GSC_IN_CHROMA_ORDER_CRCB |
+			GSC_IN_YUV420_2P);
+		break;
+	case DRM_FORMAT_YUV422:
+		cfg |= GSC_IN_YUV422_3P;
+		break;
+	case DRM_FORMAT_YUV420:
+	case DRM_FORMAT_YVU420:
+		cfg |= GSC_IN_YUV420_3P;
+		break;
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV16:
+		cfg |= (GSC_IN_CHROMA_ORDER_CBCR |
+			GSC_IN_YUV420_2P);
+		break;
+	case DRM_FORMAT_NV12MT:
+		cfg |= (GSC_IN_TILE_C_16x8 | GSC_IN_TILE_MODE);
+		break;
+	default:
+		dev_err(ippdrv->dev, "inavlid target yuv order 0x%x.\n", fmt);
+		return -EINVAL;
+	}
+
+	gsc_write(cfg, GSC_IN_CON);
+
+	return 0;
+}
+
+static int gsc_src_set_transf(struct device *dev,
+		enum drm_exynos_degree degree,
+		enum drm_exynos_flip flip, bool *swap)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	u32 cfg;
+
+	DRM_DEBUG_KMS("%s:degree[%d]flip[0x%x]\n", __func__,
+		degree, flip);
+
+	cfg = gsc_read(GSC_IN_CON);
+	cfg &= ~GSC_IN_ROT_MASK;
+
+	switch (degree) {
+	case EXYNOS_DRM_DEGREE_0:
+		if (flip & EXYNOS_DRM_FLIP_VERTICAL)
+			cfg |= GSC_IN_ROT_XFLIP;
+		if (flip & EXYNOS_DRM_FLIP_HORIZONTAL)
+			cfg |= GSC_IN_ROT_YFLIP;
+		break;
+	case EXYNOS_DRM_DEGREE_90:
+		if (flip & EXYNOS_DRM_FLIP_VERTICAL)
+			cfg |= GSC_IN_ROT_90_XFLIP;
+		else if (flip & EXYNOS_DRM_FLIP_HORIZONTAL)
+			cfg |= GSC_IN_ROT_90_YFLIP;
+		else
+			cfg |= GSC_IN_ROT_90;
+		break;
+	case EXYNOS_DRM_DEGREE_180:
+		cfg |= GSC_IN_ROT_180;
+		break;
+	case EXYNOS_DRM_DEGREE_270:
+		cfg |= GSC_IN_ROT_270;
+		break;
+	default:
+		dev_err(ippdrv->dev, "inavlid degree value %d.\n", degree);
+		return -EINVAL;
+	}
+
+	gsc_write(cfg, GSC_IN_CON);
+
+	ctx->rotation = cfg &
+		(GSC_IN_ROT_90 | GSC_IN_ROT_270) ? 1 : 0;
+	*swap = ctx->rotation;
+
+	return 0;
+}
+
+static int gsc_src_set_size(struct device *dev, int swap,
+		struct drm_exynos_pos *pos, struct drm_exynos_sz *sz)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct drm_exynos_pos img_pos = *pos;
+	struct gsc_scaler *sc = &ctx->sc;
+	u32 cfg;
+
+	DRM_DEBUG_KMS("%s:swap[%d]x[%d]y[%d]w[%d]h[%d]\n",
+		__func__, swap, pos->x, pos->y, pos->w, pos->h);
+
+	if (swap) {
+		img_pos.w = pos->h;
+		img_pos.h = pos->w;
+	}
+
+	/* pixel offset */
+	cfg = (GSC_SRCIMG_OFFSET_X(img_pos.x) |
+		GSC_SRCIMG_OFFSET_Y(img_pos.y));
+	gsc_write(cfg, GSC_SRCIMG_OFFSET);
+
+	/* cropped size */
+	cfg = (GSC_CROPPED_WIDTH(img_pos.w) |
+		GSC_CROPPED_HEIGHT(img_pos.h));
+	gsc_write(cfg, GSC_CROPPED_SIZE);
+
+	DRM_DEBUG_KMS("%s:hsize[%d]vsize[%d]\n",
+		__func__, sz->hsize, sz->vsize);
+
+	/* original size */
+	cfg = gsc_read(GSC_SRCIMG_SIZE);
+	cfg &= ~(GSC_SRCIMG_HEIGHT_MASK |
+		GSC_SRCIMG_WIDTH_MASK);
+
+	cfg |= (GSC_SRCIMG_WIDTH(sz->hsize) |
+		GSC_SRCIMG_HEIGHT(sz->vsize));
+
+	gsc_write(cfg, GSC_SRCIMG_SIZE);
+
+	cfg = gsc_read(GSC_IN_CON);
+	cfg &= ~GSC_IN_RGB_TYPE_MASK;
+
+	DRM_DEBUG_KMS("%s:width[%d]range[%d]\n",
+		__func__, pos->w, sc->range);
+
+	if (pos->w >= GSC_WIDTH_ITU_709)
+		if (sc->range)
+			cfg |= GSC_IN_RGB_HD_WIDE;
+		else
+			cfg |= GSC_IN_RGB_HD_NARROW;
+	else
+		if (sc->range)
+			cfg |= GSC_IN_RGB_SD_WIDE;
+		else
+			cfg |= GSC_IN_RGB_SD_NARROW;
+
+	gsc_write(cfg, GSC_IN_CON);
+
+	return 0;
+}
+
+static int gsc_src_set_buf_seq(struct gsc_context *ctx, u32 buf_id,
+		enum drm_exynos_ipp_buf_type buf_type)
+{
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	bool masked;
+	u32 cfg;
+	u32 mask = 0x00000001 << buf_id;
+
+	DRM_DEBUG_KMS("%s:buf_id[%d]buf_type[%d]\n", __func__,
+		buf_id, buf_type);
+
+	/* mask register set */
+	cfg = gsc_read(GSC_IN_BASE_ADDR_Y_MASK);
+
+	switch (buf_type) {
+	case IPP_BUF_ENQUEUE:
+		masked = false;
+		break;
+	case IPP_BUF_DEQUEUE:
+		masked = true;
+		break;
+	default:
+		dev_err(ippdrv->dev, "invalid buf ctrl parameter.\n");
+		return -EINVAL;
+	}
+
+	/* sequence id */
+	cfg &= ~mask;
+	cfg |= masked << buf_id;
+	gsc_write(cfg, GSC_IN_BASE_ADDR_Y_MASK);
+	gsc_write(cfg, GSC_IN_BASE_ADDR_CB_MASK);
+	gsc_write(cfg, GSC_IN_BASE_ADDR_CR_MASK);
+
+	return 0;
+}
+
+static int gsc_src_set_addr(struct device *dev,
+		struct drm_exynos_ipp_buf_info *buf_info, u32 buf_id,
+		enum drm_exynos_ipp_buf_type buf_type)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	struct drm_exynos_ipp_cmd_node *c_node = ippdrv->cmd;
+	struct drm_exynos_ipp_property *property;
+
+	if (!c_node) {
+		DRM_ERROR("failed to get c_node.\n");
+		return -EFAULT;
+	}
+
+	property = &c_node->property;
+	if (!property) {
+		DRM_ERROR("failed to get property.\n");
+		return -EFAULT;
+	}
+
+	DRM_DEBUG_KMS("%s:prop_id[%d]buf_id[%d]buf_type[%d]\n", __func__,
+		property->prop_id, buf_id, buf_type);
+
+	if (buf_id > GSC_MAX_SRC) {
+		dev_info(ippdrv->dev, "inavlid buf_id %d.\n", buf_id);
+		return -EINVAL;
+	}
+
+	/* address register set */
+	switch (buf_type) {
+	case IPP_BUF_ENQUEUE:
+		gsc_write(buf_info->base[EXYNOS_DRM_PLANAR_Y],
+			GSC_IN_BASE_ADDR_Y(buf_id));
+		gsc_write(buf_info->base[EXYNOS_DRM_PLANAR_CB],
+			GSC_IN_BASE_ADDR_CB(buf_id));
+		gsc_write(buf_info->base[EXYNOS_DRM_PLANAR_CR],
+			GSC_IN_BASE_ADDR_CR(buf_id));
+		break;
+	case IPP_BUF_DEQUEUE:
+		gsc_write(0x0, GSC_IN_BASE_ADDR_Y(buf_id));
+		gsc_write(0x0, GSC_IN_BASE_ADDR_CB(buf_id));
+		gsc_write(0x0, GSC_IN_BASE_ADDR_CR(buf_id));
+		break;
+	default:
+		/* bypass */
+		break;
+	}
+
+	return gsc_src_set_buf_seq(ctx, buf_id, buf_type);
+}
+
+static struct exynos_drm_ipp_ops gsc_src_ops = {
+	.set_fmt = gsc_src_set_fmt,
+	.set_transf = gsc_src_set_transf,
+	.set_size = gsc_src_set_size,
+	.set_addr = gsc_src_set_addr,
+};
+
+static int gsc_dst_set_fmt(struct device *dev, u32 fmt)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	u32 cfg;
+
+	DRM_DEBUG_KMS("%s:fmt[0x%x]\n", __func__, fmt);
+
+	cfg = gsc_read(GSC_OUT_CON);
+	cfg &= ~(GSC_OUT_RGB_TYPE_MASK | GSC_OUT_YUV422_1P_ORDER_MASK |
+		 GSC_OUT_CHROMA_ORDER_MASK | GSC_OUT_FORMAT_MASK |
+		 GSC_OUT_CHROM_STRIDE_SEL_MASK | GSC_OUT_RB_SWAP_MASK |
+		 GSC_OUT_GLOBAL_ALPHA_MASK);
+
+	switch (fmt) {
+	case DRM_FORMAT_RGB565:
+		cfg |= GSC_OUT_RGB565;
+		break;
+	case DRM_FORMAT_XRGB8888:
+		cfg |= GSC_OUT_XRGB8888;
+		break;
+	case DRM_FORMAT_BGRX8888:
+		cfg |= (GSC_OUT_XRGB8888 | GSC_OUT_RB_SWAP);
+		break;
+	case DRM_FORMAT_YUYV:
+		cfg |= (GSC_OUT_YUV422_1P |
+			GSC_OUT_YUV422_1P_ORDER_LSB_Y |
+			GSC_OUT_CHROMA_ORDER_CBCR);
+		break;
+	case DRM_FORMAT_YVYU:
+		cfg |= (GSC_OUT_YUV422_1P |
+			GSC_OUT_YUV422_1P_ORDER_LSB_Y |
+			GSC_OUT_CHROMA_ORDER_CRCB);
+		break;
+	case DRM_FORMAT_UYVY:
+		cfg |= (GSC_OUT_YUV422_1P |
+			GSC_OUT_YUV422_1P_OEDER_LSB_C |
+			GSC_OUT_CHROMA_ORDER_CBCR);
+		break;
+	case DRM_FORMAT_VYUY:
+		cfg |= (GSC_OUT_YUV422_1P |
+			GSC_OUT_YUV422_1P_OEDER_LSB_C |
+			GSC_OUT_CHROMA_ORDER_CRCB);
+		break;
+	case DRM_FORMAT_NV21:
+	case DRM_FORMAT_NV61:
+		cfg |= (GSC_OUT_CHROMA_ORDER_CRCB | GSC_OUT_YUV420_2P);
+		break;
+	case DRM_FORMAT_YUV422:
+	case DRM_FORMAT_YUV420:
+	case DRM_FORMAT_YVU420:
+		cfg |= GSC_OUT_YUV420_3P;
+		break;
+	case DRM_FORMAT_NV12:
+	case DRM_FORMAT_NV16:
+		cfg |= (GSC_OUT_CHROMA_ORDER_CBCR |
+			GSC_OUT_YUV420_2P);
+		break;
+	case DRM_FORMAT_NV12MT:
+		cfg |= (GSC_OUT_TILE_C_16x8 | GSC_OUT_TILE_MODE);
+		break;
+	default:
+		dev_err(ippdrv->dev, "inavlid target yuv order 0x%x.\n", fmt);
+		return -EINVAL;
+	}
+
+	gsc_write(cfg, GSC_OUT_CON);
+
+	return 0;
+}
+
+static int gsc_dst_set_transf(struct device *dev,
+		enum drm_exynos_degree degree,
+		enum drm_exynos_flip flip, bool *swap)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	u32 cfg;
+
+	DRM_DEBUG_KMS("%s:degree[%d]flip[0x%x]\n", __func__,
+		degree, flip);
+
+	cfg = gsc_read(GSC_IN_CON);
+	cfg &= ~GSC_IN_ROT_MASK;
+
+	switch (degree) {
+	case EXYNOS_DRM_DEGREE_0:
+		if (flip & EXYNOS_DRM_FLIP_VERTICAL)
+			cfg |= GSC_IN_ROT_XFLIP;
+		if (flip & EXYNOS_DRM_FLIP_HORIZONTAL)
+			cfg |= GSC_IN_ROT_YFLIP;
+		break;
+	case EXYNOS_DRM_DEGREE_90:
+		if (flip & EXYNOS_DRM_FLIP_VERTICAL)
+			cfg |= GSC_IN_ROT_90_XFLIP;
+		else if (flip & EXYNOS_DRM_FLIP_HORIZONTAL)
+			cfg |= GSC_IN_ROT_90_YFLIP;
+		else
+			cfg |= GSC_IN_ROT_90;
+		break;
+	case EXYNOS_DRM_DEGREE_180:
+		cfg |= GSC_IN_ROT_180;
+		break;
+	case EXYNOS_DRM_DEGREE_270:
+		cfg |= GSC_IN_ROT_270;
+		break;
+	default:
+		dev_err(ippdrv->dev, "inavlid degree value %d.\n", degree);
+		return -EINVAL;
+	}
+
+	gsc_write(cfg, GSC_IN_CON);
+
+	ctx->rotation = cfg &
+		(GSC_IN_ROT_90 | GSC_IN_ROT_270) ? 1 : 0;
+	*swap = ctx->rotation;
+
+	return 0;
+}
+
+static int gsc_get_ratio_shift(u32 src, u32 dst, u32 *ratio)
+{
+	DRM_DEBUG_KMS("%s:src[%d]dst[%d]\n", __func__, src, dst);
+
+	if (src >= dst * 8) {
+		DRM_ERROR("failed to make ratio and shift.\n");
+		return -EINVAL;
+	} else if (src >= dst * 4)
+		*ratio = 4;
+	else if (src >= dst * 2)
+		*ratio = 2;
+	else
+		*ratio = 1;
+
+	return 0;
+}
+
+static void gsc_get_prescaler_shfactor(u32 hratio, u32 vratio, u32 *shfactor)
+{
+	if (hratio == 4 && vratio == 4)
+		*shfactor = 4;
+	else if ((hratio == 4 && vratio == 2) ||
+		 (hratio == 2 && vratio == 4))
+		*shfactor = 3;
+	else if ((hratio == 4 && vratio == 1) ||
+		 (hratio == 1 && vratio == 4) ||
+		 (hratio == 2 && vratio == 2))
+		*shfactor = 2;
+	else if (hratio == 1 && vratio == 1)
+		*shfactor = 0;
+	else
+		*shfactor = 1;
+}
+
+static int gsc_set_prescaler(struct gsc_context *ctx, struct gsc_scaler *sc,
+		struct drm_exynos_pos *src, struct drm_exynos_pos *dst)
+{
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	u32 cfg;
+	u32 src_w, src_h, dst_w, dst_h;
+	int ret = 0;
+
+	src_w = src->w;
+	src_h = src->h;
+
+	if (ctx->rotation) {
+		dst_w = dst->h;
+		dst_h = dst->w;
+	} else {
+		dst_w = dst->w;
+		dst_h = dst->h;
+	}
+
+	ret = gsc_get_ratio_shift(src_w, dst_w, &sc->pre_hratio);
+	if (ret) {
+		dev_err(ippdrv->dev, "failed to get ratio horizontal.\n");
+		return ret;
+	}
+
+	ret = gsc_get_ratio_shift(src_h, dst_h, &sc->pre_vratio);
+	if (ret) {
+		dev_err(ippdrv->dev, "failed to get ratio vertical.\n");
+		return ret;
+	}
+
+	DRM_DEBUG_KMS("%s:pre_hratio[%d]pre_vratio[%d]\n",
+		__func__, sc->pre_hratio, sc->pre_vratio);
+
+	sc->main_hratio = (src_w << 16) / dst_w;
+	sc->main_vratio = (src_h << 16) / dst_h;
+
+	DRM_DEBUG_KMS("%s:main_hratio[%ld]main_vratio[%ld]\n",
+		__func__, sc->main_hratio, sc->main_vratio);
+
+	gsc_get_prescaler_shfactor(sc->pre_hratio, sc->pre_vratio,
+		&sc->pre_shfactor);
+
+	DRM_DEBUG_KMS("%s:pre_shfactor[%d]\n", __func__,
+		sc->pre_shfactor);
+
+	cfg = (GSC_PRESC_SHFACTOR(sc->pre_shfactor) |
+		GSC_PRESC_H_RATIO(sc->pre_hratio) |
+		GSC_PRESC_V_RATIO(sc->pre_vratio));
+	gsc_write(cfg, GSC_PRE_SCALE_RATIO);
+
+	return ret;
+}
+
+static void gsc_set_h_coef(struct gsc_context *ctx, unsigned long main_hratio)
+{
+	int i, j, k, sc_ratio;
+
+	if (main_hratio <= GSC_SC_UP_MAX_RATIO)
+		sc_ratio = 0;
+	else if (main_hratio <= GSC_SC_DOWN_RATIO_7_8)
+		sc_ratio = 1;
+	else if (main_hratio <= GSC_SC_DOWN_RATIO_6_8)
+		sc_ratio = 2;
+	else if (main_hratio <= GSC_SC_DOWN_RATIO_5_8)
+		sc_ratio = 3;
+	else if (main_hratio <= GSC_SC_DOWN_RATIO_4_8)
+		sc_ratio = 4;
+	else if (main_hratio <= GSC_SC_DOWN_RATIO_3_8)
+		sc_ratio = 5;
+	else
+		sc_ratio = 6;
+
+	for (i = 0; i < GSC_COEF_PHASE; i++)
+		for (j = 0; j < GSC_COEF_H_8T; j++)
+			for (k = 0; k < GSC_COEF_DEPTH; k++)
+				gsc_write(h_coef_8t[sc_ratio][i][j],
+					GSC_HCOEF(i, j, k));
+}
+
+static void gsc_set_v_coef(struct gsc_context *ctx, unsigned long main_vratio)
+{
+	int i, j, k, sc_ratio;
+
+	if (main_vratio <= GSC_SC_UP_MAX_RATIO)
+		sc_ratio = 0;
+	else if (main_vratio <= GSC_SC_DOWN_RATIO_7_8)
+		sc_ratio = 1;
+	else if (main_vratio <= GSC_SC_DOWN_RATIO_6_8)
+		sc_ratio = 2;
+	else if (main_vratio <= GSC_SC_DOWN_RATIO_5_8)
+		sc_ratio = 3;
+	else if (main_vratio <= GSC_SC_DOWN_RATIO_4_8)
+		sc_ratio = 4;
+	else if (main_vratio <= GSC_SC_DOWN_RATIO_3_8)
+		sc_ratio = 5;
+	else
+		sc_ratio = 6;
+
+	for (i = 0; i < GSC_COEF_PHASE; i++)
+		for (j = 0; j < GSC_COEF_V_4T; j++)
+			for (k = 0; k < GSC_COEF_DEPTH; k++)
+				gsc_write(v_coef_4t[sc_ratio][i][j],
+					GSC_VCOEF(i, j, k));
+}
+
+static void gsc_set_scaler(struct gsc_context *ctx, struct gsc_scaler *sc)
+{
+	u32 cfg;
+
+	DRM_DEBUG_KMS("%s:main_hratio[%ld]main_vratio[%ld]\n",
+		__func__, sc->main_hratio, sc->main_vratio);
+
+	gsc_set_h_coef(ctx, sc->main_hratio);
+	cfg = GSC_MAIN_H_RATIO_VALUE(sc->main_hratio);
+	gsc_write(cfg, GSC_MAIN_H_RATIO);
+
+	gsc_set_v_coef(ctx, sc->main_vratio);
+	cfg = GSC_MAIN_V_RATIO_VALUE(sc->main_vratio);
+	gsc_write(cfg, GSC_MAIN_V_RATIO);
+}
+
+static int gsc_dst_set_size(struct device *dev, int swap,
+		struct drm_exynos_pos *pos, struct drm_exynos_sz *sz)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct drm_exynos_pos img_pos = *pos;
+	struct gsc_scaler *sc = &ctx->sc;
+	u32 cfg;
+
+	DRM_DEBUG_KMS("%s:swap[%d]x[%d]y[%d]w[%d]h[%d]\n",
+		__func__, swap, pos->x, pos->y, pos->w, pos->h);
+
+	if (swap) {
+		img_pos.w = pos->h;
+		img_pos.h = pos->w;
+	}
+
+	/* pixel offset */
+	cfg = (GSC_DSTIMG_OFFSET_X(pos->x) |
+		GSC_DSTIMG_OFFSET_Y(pos->y));
+	gsc_write(cfg, GSC_DSTIMG_OFFSET);
+
+	/* scaled size */
+	cfg = (GSC_SCALED_WIDTH(img_pos.w) | GSC_SCALED_HEIGHT(img_pos.h));
+	gsc_write(cfg, GSC_SCALED_SIZE);
+
+	DRM_DEBUG_KMS("%s:hsize[%d]vsize[%d]\n",
+		__func__, sz->hsize, sz->vsize);
+
+	/* original size */
+	cfg = gsc_read(GSC_DSTIMG_SIZE);
+	cfg &= ~(GSC_DSTIMG_HEIGHT_MASK |
+		GSC_DSTIMG_WIDTH_MASK);
+	cfg |= (GSC_DSTIMG_WIDTH(sz->hsize) |
+		GSC_DSTIMG_HEIGHT(sz->vsize));
+	gsc_write(cfg, GSC_DSTIMG_SIZE);
+
+	cfg = gsc_read(GSC_OUT_CON);
+	cfg &= ~GSC_OUT_RGB_TYPE_MASK;
+
+	DRM_DEBUG_KMS("%s:width[%d]range[%d]\n",
+		__func__, pos->w, sc->range);
+
+	if (pos->w >= GSC_WIDTH_ITU_709)
+		if (sc->range)
+			cfg |= GSC_OUT_RGB_HD_WIDE;
+		else
+			cfg |= GSC_OUT_RGB_HD_NARROW;
+	else
+		if (sc->range)
+			cfg |= GSC_OUT_RGB_SD_WIDE;
+		else
+			cfg |= GSC_OUT_RGB_SD_NARROW;
+
+	gsc_write(cfg, GSC_OUT_CON);
+
+	return 0;
+}
+
+static int gsc_dst_get_buf_seq(struct gsc_context *ctx)
+{
+	u32 cfg, i, buf_num = GSC_REG_SZ;
+	u32 mask = 0x00000001;
+
+	cfg = gsc_read(GSC_OUT_BASE_ADDR_Y_MASK);
+
+	for (i = 0; i < GSC_REG_SZ; i++)
+		if (cfg & (mask << i))
+			buf_num--;
+
+	DRM_DEBUG_KMS("%s:buf_num[%d]\n", __func__, buf_num);
+
+	return buf_num;
+}
+
+static int gsc_dst_set_buf_seq(struct gsc_context *ctx, u32 buf_id,
+		enum drm_exynos_ipp_buf_type buf_type)
+{
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	bool masked;
+	u32 cfg;
+	u32 mask = 0x00000001 << buf_id;
+	int ret = 0;
+
+	DRM_DEBUG_KMS("%s:buf_id[%d]buf_type[%d]\n", __func__,
+		buf_id, buf_type);
+
+	mutex_lock(&ctx->lock);
+
+	/* mask register set */
+	cfg = gsc_read(GSC_OUT_BASE_ADDR_Y_MASK);
+
+	switch (buf_type) {
+	case IPP_BUF_ENQUEUE:
+		masked = false;
+		break;
+	case IPP_BUF_DEQUEUE:
+		masked = true;
+		break;
+	default:
+		dev_err(ippdrv->dev, "invalid buf ctrl parameter.\n");
+		ret =  -EINVAL;
+		goto err_unlock;
+	}
+
+	/* sequence id */
+	cfg &= ~mask;
+	cfg |= masked << buf_id;
+	gsc_write(cfg, GSC_OUT_BASE_ADDR_Y_MASK);
+	gsc_write(cfg, GSC_OUT_BASE_ADDR_CB_MASK);
+	gsc_write(cfg, GSC_OUT_BASE_ADDR_CR_MASK);
+
+	/* interrupt enable */
+	if (buf_type == IPP_BUF_ENQUEUE &&
+	    gsc_dst_get_buf_seq(ctx) >= GSC_BUF_START)
+		gsc_handle_irq(ctx, true, false, true);
+
+	/* interrupt disable */
+	if (buf_type == IPP_BUF_DEQUEUE &&
+	    gsc_dst_get_buf_seq(ctx) <= GSC_BUF_STOP)
+		gsc_handle_irq(ctx, false, false, true);
+
+err_unlock:
+	mutex_unlock(&ctx->lock);
+	return ret;
+}
+
+static int gsc_dst_set_addr(struct device *dev,
+		struct drm_exynos_ipp_buf_info *buf_info, u32 buf_id,
+		enum drm_exynos_ipp_buf_type buf_type)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	struct drm_exynos_ipp_cmd_node *c_node = ippdrv->cmd;
+	struct drm_exynos_ipp_property *property;
+
+	if (!c_node) {
+		DRM_ERROR("failed to get c_node.\n");
+		return -EFAULT;
+	}
+
+	property = &c_node->property;
+	if (!property) {
+		DRM_ERROR("failed to get property.\n");
+		return -EFAULT;
+	}
+
+	DRM_DEBUG_KMS("%s:prop_id[%d]buf_id[%d]buf_type[%d]\n", __func__,
+		property->prop_id, buf_id, buf_type);
+
+	if (buf_id > GSC_MAX_DST) {
+		dev_info(ippdrv->dev, "inavlid buf_id %d.\n", buf_id);
+		return -EINVAL;
+	}
+
+	/* address register set */
+	switch (buf_type) {
+	case IPP_BUF_ENQUEUE:
+		gsc_write(buf_info->base[EXYNOS_DRM_PLANAR_Y],
+			GSC_OUT_BASE_ADDR_Y(buf_id));
+		gsc_write(buf_info->base[EXYNOS_DRM_PLANAR_CB],
+			GSC_OUT_BASE_ADDR_CB(buf_id));
+		gsc_write(buf_info->base[EXYNOS_DRM_PLANAR_CR],
+			GSC_OUT_BASE_ADDR_CR(buf_id));
+		break;
+	case IPP_BUF_DEQUEUE:
+		gsc_write(0x0, GSC_OUT_BASE_ADDR_Y(buf_id));
+		gsc_write(0x0, GSC_OUT_BASE_ADDR_CB(buf_id));
+		gsc_write(0x0, GSC_OUT_BASE_ADDR_CR(buf_id));
+		break;
+	default:
+		/* bypass */
+		break;
+	}
+
+	return gsc_dst_set_buf_seq(ctx, buf_id, buf_type);
+}
+
+static struct exynos_drm_ipp_ops gsc_dst_ops = {
+	.set_fmt = gsc_dst_set_fmt,
+	.set_transf = gsc_dst_set_transf,
+	.set_size = gsc_dst_set_size,
+	.set_addr = gsc_dst_set_addr,
+};
+
+static int gsc_clk_ctrl(struct gsc_context *ctx, bool enable)
+{
+	DRM_DEBUG_KMS("%s:enable[%d]\n", __func__, enable);
+
+	if (enable) {
+		clk_enable(ctx->gsc_clk);
+		ctx->suspended = false;
+	} else {
+		clk_disable(ctx->gsc_clk);
+		ctx->suspended = true;
+	}
+
+	return 0;
+}
+
+static int gsc_get_src_buf_index(struct gsc_context *ctx)
+{
+	u32 cfg, curr_index, i;
+	u32 buf_id = GSC_MAX_SRC;
+	int ret;
+
+	DRM_DEBUG_KMS("%s:gsc id[%d]\n", __func__, ctx->id);
+
+	cfg = gsc_read(GSC_IN_BASE_ADDR_Y_MASK);
+	curr_index = GSC_IN_CURR_GET_INDEX(cfg);
+
+	for (i = curr_index; i < GSC_MAX_SRC; i++) {
+		if (!((cfg >> i) & 0x1)) {
+			buf_id = i;
+			break;
+		}
+	}
+
+	if (buf_id == GSC_MAX_SRC) {
+		DRM_ERROR("failed to get in buffer index.\n");
+		return -EINVAL;
+	}
+
+	ret = gsc_src_set_buf_seq(ctx, buf_id, IPP_BUF_DEQUEUE);
+	if (ret < 0) {
+		DRM_ERROR("failed to dequeue.\n");
+		return ret;
+	}
+
+	DRM_DEBUG_KMS("%s:cfg[0x%x]curr_index[%d]buf_id[%d]\n", __func__, cfg,
+		curr_index, buf_id);
+
+	return buf_id;
+}
+
+static int gsc_get_dst_buf_index(struct gsc_context *ctx)
+{
+	u32 cfg, curr_index, i;
+	u32 buf_id = GSC_MAX_DST;
+	int ret;
+
+	DRM_DEBUG_KMS("%s:gsc id[%d]\n", __func__, ctx->id);
+
+	cfg = gsc_read(GSC_OUT_BASE_ADDR_Y_MASK);
+	curr_index = GSC_OUT_CURR_GET_INDEX(cfg);
+
+	for (i = curr_index; i < GSC_MAX_DST; i++) {
+		if (!((cfg >> i) & 0x1)) {
+			buf_id = i;
+			break;
+		}
+	}
+
+	if (buf_id == GSC_MAX_DST) {
+		DRM_ERROR("failed to get out buffer index.\n");
+		return -EINVAL;
+	}
+
+	ret = gsc_dst_set_buf_seq(ctx, buf_id, IPP_BUF_DEQUEUE);
+	if (ret < 0) {
+		DRM_ERROR("failed to dequeue.\n");
+		return ret;
+	}
+
+	DRM_DEBUG_KMS("%s:cfg[0x%x]curr_index[%d]buf_id[%d]\n", __func__, cfg,
+		curr_index, buf_id);
+
+	return buf_id;
+}
+
+static irqreturn_t gsc_irq_handler(int irq, void *dev_id)
+{
+	struct gsc_context *ctx = dev_id;
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	struct drm_exynos_ipp_cmd_node *c_node = ippdrv->cmd;
+	struct drm_exynos_ipp_event_work *event_work =
+		c_node->event_work;
+	u32 status;
+	int buf_id[EXYNOS_DRM_OPS_MAX];
+
+	DRM_DEBUG_KMS("%s:gsc id[%d]\n", __func__, ctx->id);
+
+	status = gsc_read(GSC_IRQ);
+	if (status & GSC_IRQ_STATUS_OR_IRQ) {
+		dev_err(ippdrv->dev, "occured overflow at %d, status 0x%x.\n",
+			ctx->id, status);
+		return IRQ_NONE;
+	}
+
+	if (status & GSC_IRQ_STATUS_OR_FRM_DONE) {
+		dev_dbg(ippdrv->dev, "occured frame done at %d, status 0x%x.\n",
+			ctx->id, status);
+
+		buf_id[EXYNOS_DRM_OPS_SRC] = gsc_get_src_buf_index(ctx);
+		if (buf_id[EXYNOS_DRM_OPS_SRC] < 0)
+			return IRQ_HANDLED;
+
+		buf_id[EXYNOS_DRM_OPS_DST] = gsc_get_dst_buf_index(ctx);
+		if (buf_id[EXYNOS_DRM_OPS_DST] < 0)
+			return IRQ_HANDLED;
+
+		DRM_DEBUG_KMS("%s:buf_id_src[%d]buf_id_dst[%d]\n", __func__,
+			buf_id[EXYNOS_DRM_OPS_SRC], buf_id[EXYNOS_DRM_OPS_DST]);
+
+		event_work->ippdrv = ippdrv;
+		event_work->buf_id[EXYNOS_DRM_OPS_SRC] =
+			buf_id[EXYNOS_DRM_OPS_SRC];
+		event_work->buf_id[EXYNOS_DRM_OPS_DST] =
+			buf_id[EXYNOS_DRM_OPS_DST];
+		queue_work(ippdrv->event_workq,
+			(struct work_struct *)event_work);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int gsc_init_prop_list(struct exynos_drm_ippdrv *ippdrv)
+{
+	struct drm_exynos_ipp_prop_list *prop_list;
+
+	DRM_DEBUG_KMS("%s\n", __func__);
+
+	prop_list = devm_kzalloc(ippdrv->dev, sizeof(*prop_list), GFP_KERNEL);
+	if (!prop_list) {
+		DRM_ERROR("failed to alloc property list.\n");
+		return -ENOMEM;
+	}
+
+	prop_list->version = 1;
+	prop_list->writeback = 1;
+	prop_list->refresh_min = GSC_REFRESH_MIN;
+	prop_list->refresh_max = GSC_REFRESH_MAX;
+	prop_list->flip = (1 << EXYNOS_DRM_FLIP_VERTICAL) |
+				(1 << EXYNOS_DRM_FLIP_HORIZONTAL);
+	prop_list->degree = (1 << EXYNOS_DRM_DEGREE_0) |
+				(1 << EXYNOS_DRM_DEGREE_90) |
+				(1 << EXYNOS_DRM_DEGREE_180) |
+				(1 << EXYNOS_DRM_DEGREE_270);
+	prop_list->csc = 1;
+	prop_list->crop = 1;
+	prop_list->crop_max.hsize = GSC_CROP_MAX;
+	prop_list->crop_max.vsize = GSC_CROP_MAX;
+	prop_list->crop_min.hsize = GSC_CROP_MIN;
+	prop_list->crop_min.vsize = GSC_CROP_MIN;
+	prop_list->scale = 1;
+	prop_list->scale_max.hsize = GSC_SCALE_MAX;
+	prop_list->scale_max.vsize = GSC_SCALE_MAX;
+	prop_list->scale_min.hsize = GSC_SCALE_MIN;
+	prop_list->scale_min.vsize = GSC_SCALE_MIN;
+
+	ippdrv->prop_list = prop_list;
+
+	return 0;
+}
+
+static inline bool gsc_check_drm_flip(enum drm_exynos_flip flip)
+{
+	switch (flip) {
+	case EXYNOS_DRM_FLIP_NONE:
+	case EXYNOS_DRM_FLIP_VERTICAL:
+	case EXYNOS_DRM_FLIP_HORIZONTAL:
+	case EXYNOS_DRM_FLIP_VERTICAL | EXYNOS_DRM_FLIP_HORIZONTAL:
+		return true;
+	default:
+		DRM_DEBUG_KMS("%s:invalid flip\n", __func__);
+		return false;
+	}
+}
+
+static int gsc_ippdrv_check_property(struct device *dev,
+		struct drm_exynos_ipp_property *property)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	struct drm_exynos_ipp_prop_list *pp = ippdrv->prop_list;
+	struct drm_exynos_ipp_config *config;
+	struct drm_exynos_pos *pos;
+	struct drm_exynos_sz *sz;
+	bool swap;
+	int i;
+
+	DRM_DEBUG_KMS("%s\n", __func__);
+
+	for_each_ipp_ops(i) {
+		if ((i == EXYNOS_DRM_OPS_SRC) &&
+			(property->cmd == IPP_CMD_WB))
+			continue;
+
+		config = &property->config[i];
+		pos = &config->pos;
+		sz = &config->sz;
+
+		/* check for flip */
+		if (!gsc_check_drm_flip(config->flip)) {
+			DRM_ERROR("invalid flip.\n");
+			goto err_property;
+		}
+
+		/* check for degree */
+		switch (config->degree) {
+		case EXYNOS_DRM_DEGREE_90:
+		case EXYNOS_DRM_DEGREE_270:
+			swap = true;
+			break;
+		case EXYNOS_DRM_DEGREE_0:
+		case EXYNOS_DRM_DEGREE_180:
+			swap = false;
+			break;
+		default:
+			DRM_ERROR("invalid degree.\n");
+			goto err_property;
+		}
+
+		/* check for buffer bound */
+		if ((pos->x + pos->w > sz->hsize) ||
+			(pos->y + pos->h > sz->vsize)) {
+			DRM_ERROR("out of buf bound.\n");
+			goto err_property;
+		}
+
+		/* check for crop */
+		if ((i == EXYNOS_DRM_OPS_SRC) && (pp->crop)) {
+			if (swap) {
+				if ((pos->h < pp->crop_min.hsize) ||
+					(sz->vsize > pp->crop_max.hsize) ||
+					(pos->w < pp->crop_min.vsize) ||
+					(sz->hsize > pp->crop_max.vsize)) {
+					DRM_ERROR("out of crop size.\n");
+					goto err_property;
+				}
+			} else {
+				if ((pos->w < pp->crop_min.hsize) ||
+					(sz->hsize > pp->crop_max.hsize) ||
+					(pos->h < pp->crop_min.vsize) ||
+					(sz->vsize > pp->crop_max.vsize)) {
+					DRM_ERROR("out of crop size.\n");
+					goto err_property;
+				}
+			}
+		}
+
+		/* check for scale */
+		if ((i == EXYNOS_DRM_OPS_DST) && (pp->scale)) {
+			if (swap) {
+				if ((pos->h < pp->scale_min.hsize) ||
+					(sz->vsize > pp->scale_max.hsize) ||
+					(pos->w < pp->scale_min.vsize) ||
+					(sz->hsize > pp->scale_max.vsize)) {
+					DRM_ERROR("out of scale size.\n");
+					goto err_property;
+				}
+			} else {
+				if ((pos->w < pp->scale_min.hsize) ||
+					(sz->hsize > pp->scale_max.hsize) ||
+					(pos->h < pp->scale_min.vsize) ||
+					(sz->vsize > pp->scale_max.vsize)) {
+					DRM_ERROR("out of scale size.\n");
+					goto err_property;
+				}
+			}
+		}
+	}
+
+	return 0;
+
+err_property:
+	for_each_ipp_ops(i) {
+		if ((i == EXYNOS_DRM_OPS_SRC) &&
+			(property->cmd == IPP_CMD_WB))
+			continue;
+
+		config = &property->config[i];
+		pos = &config->pos;
+		sz = &config->sz;
+
+		DRM_ERROR("[%s]f[%d]r[%d]pos[%d %d %d %d]sz[%d %d]\n",
+			i ? "dst" : "src", config->flip, config->degree,
+			pos->x, pos->y, pos->w, pos->h,
+			sz->hsize, sz->vsize);
+	}
+
+	return -EINVAL;
+}
+
+
+static int gsc_ippdrv_reset(struct device *dev)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct gsc_scaler *sc = &ctx->sc;
+	int ret;
+
+	DRM_DEBUG_KMS("%s\n", __func__);
+
+	/* reset h/w block */
+	ret = gsc_sw_reset(ctx);
+	if (ret < 0) {
+		dev_err(dev, "failed to reset hardware.\n");
+		return ret;
+	}
+
+	/* scaler setting */
+	memset(&ctx->sc, 0x0, sizeof(ctx->sc));
+	sc->range = true;
+
+	return 0;
+}
+
+static int gsc_ippdrv_start(struct device *dev, enum drm_exynos_ipp_cmd cmd)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+	struct drm_exynos_ipp_cmd_node *c_node = ippdrv->cmd;
+	struct drm_exynos_ipp_property *property;
+	struct drm_exynos_ipp_config *config;
+	struct drm_exynos_pos	img_pos[EXYNOS_DRM_OPS_MAX];
+	struct drm_exynos_ipp_set_wb set_wb;
+	u32 cfg;
+	int ret, i;
+
+	DRM_DEBUG_KMS("%s:cmd[%d]\n", __func__, cmd);
+
+	if (!c_node) {
+		DRM_ERROR("failed to get c_node.\n");
+		return -EINVAL;
+	}
+
+	property = &c_node->property;
+	if (!property) {
+		DRM_ERROR("failed to get property.\n");
+		return -EINVAL;
+	}
+
+	gsc_handle_irq(ctx, true, false, true);
+
+	for_each_ipp_ops(i) {
+		config = &property->config[i];
+		img_pos[i] = config->pos;
+	}
+
+	switch (cmd) {
+	case IPP_CMD_M2M:
+		/* enable one shot */
+		cfg = gsc_read(GSC_ENABLE);
+		cfg &= ~(GSC_ENABLE_ON_CLEAR_MASK |
+			GSC_ENABLE_CLK_GATE_MODE_MASK);
+		cfg |= GSC_ENABLE_ON_CLEAR_ONESHOT;
+		gsc_write(cfg, GSC_ENABLE);
+
+		/* src dma memory */
+		cfg = gsc_read(GSC_IN_CON);
+		cfg &= ~(GSC_IN_PATH_MASK | GSC_IN_LOCAL_SEL_MASK);
+		cfg |= GSC_IN_PATH_MEMORY;
+		gsc_write(cfg, GSC_IN_CON);
+
+		/* dst dma memory */
+		cfg = gsc_read(GSC_OUT_CON);
+		cfg |= GSC_OUT_PATH_MEMORY;
+		gsc_write(cfg, GSC_OUT_CON);
+		break;
+	case IPP_CMD_WB:
+		set_wb.enable = 1;
+		set_wb.refresh = property->refresh_rate;
+		gsc_set_gscblk_fimd_wb(ctx, set_wb.enable);
+		exynos_drm_ippnb_send_event(IPP_SET_WRITEBACK, (void *)&set_wb);
+
+		/* src local path */
+		cfg = readl(GSC_IN_CON);
+		cfg &= ~(GSC_IN_PATH_MASK | GSC_IN_LOCAL_SEL_MASK);
+		cfg |= (GSC_IN_PATH_LOCAL | GSC_IN_LOCAL_FIMD_WB);
+		gsc_write(cfg, GSC_IN_CON);
+
+		/* dst dma memory */
+		cfg = gsc_read(GSC_OUT_CON);
+		cfg |= GSC_OUT_PATH_MEMORY;
+		gsc_write(cfg, GSC_OUT_CON);
+		break;
+	case IPP_CMD_OUTPUT:
+		/* src dma memory */
+		cfg = gsc_read(GSC_IN_CON);
+		cfg &= ~(GSC_IN_PATH_MASK | GSC_IN_LOCAL_SEL_MASK);
+		cfg |= GSC_IN_PATH_MEMORY;
+		gsc_write(cfg, GSC_IN_CON);
+
+		/* dst local path */
+		cfg = gsc_read(GSC_OUT_CON);
+		cfg |= GSC_OUT_PATH_MEMORY;
+		gsc_write(cfg, GSC_OUT_CON);
+		break;
+	default:
+		ret = -EINVAL;
+		dev_err(dev, "invalid operations.\n");
+		return ret;
+	}
+
+	ret = gsc_set_prescaler(ctx, &ctx->sc,
+		&img_pos[EXYNOS_DRM_OPS_SRC],
+		&img_pos[EXYNOS_DRM_OPS_DST]);
+	if (ret) {
+		dev_err(dev, "failed to set precalser.\n");
+		return ret;
+	}
+
+	gsc_set_scaler(ctx, &ctx->sc);
+
+	cfg = gsc_read(GSC_ENABLE);
+	cfg |= GSC_ENABLE_ON;
+	gsc_write(cfg, GSC_ENABLE);
+
+	return 0;
+}
+
+static void gsc_ippdrv_stop(struct device *dev, enum drm_exynos_ipp_cmd cmd)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct drm_exynos_ipp_set_wb set_wb = {0, 0};
+	u32 cfg;
+
+	DRM_DEBUG_KMS("%s:cmd[%d]\n", __func__, cmd);
+
+	switch (cmd) {
+	case IPP_CMD_M2M:
+		/* bypass */
+		break;
+	case IPP_CMD_WB:
+		gsc_set_gscblk_fimd_wb(ctx, set_wb.enable);
+		exynos_drm_ippnb_send_event(IPP_SET_WRITEBACK, (void *)&set_wb);
+		break;
+	case IPP_CMD_OUTPUT:
+	default:
+		dev_err(dev, "invalid operations.\n");
+		break;
+	}
+
+	gsc_handle_irq(ctx, false, false, true);
+
+	/* reset sequence */
+	gsc_write(0xff, GSC_OUT_BASE_ADDR_Y_MASK);
+	gsc_write(0xff, GSC_OUT_BASE_ADDR_CB_MASK);
+	gsc_write(0xff, GSC_OUT_BASE_ADDR_CR_MASK);
+
+	cfg = gsc_read(GSC_ENABLE);
+	cfg &= ~GSC_ENABLE_ON;
+	gsc_write(cfg, GSC_ENABLE);
+}
+
+static int __devinit gsc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct gsc_context *ctx;
+	struct resource *res;
+	struct exynos_drm_ippdrv *ippdrv;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	/* clock control */
+	ctx->gsc_clk = clk_get(dev, "gscl");
+	if (IS_ERR(ctx->gsc_clk)) {
+		dev_err(dev, "failed to get gsc clock.\n");
+		ret = PTR_ERR(ctx->gsc_clk);
+		goto err_ctx;
+	}
+
+	/* resource memory */
+	ctx->regs_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!ctx->regs_res) {
+		dev_err(dev, "failed to find registers.\n");
+		ret = -ENOENT;
+		goto err_clk;
+	}
+
+	ctx->regs = devm_request_and_ioremap(dev, ctx->regs_res);
+	if (!ctx->regs) {
+		dev_err(dev, "failed to map registers.\n");
+		ret = -ENXIO;
+		goto err_clk;
+	}
+
+	/* resource irq */
+	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	if (!res) {
+		dev_err(dev, "failed to request irq resource.\n");
+		ret = -ENOENT;
+		goto err_get_regs;
+	}
+
+	ctx->irq = res->start;
+	ret = request_threaded_irq(ctx->irq, NULL, gsc_irq_handler,
+		IRQF_ONESHOT, "drm_gsc", ctx);
+	if (ret < 0) {
+		dev_err(dev, "failed to request irq.\n");
+		goto err_get_regs;
+	}
+
+	/* context initailization */
+	ctx->id = pdev->id;
+
+	ippdrv = &ctx->ippdrv;
+	ippdrv->dev = dev;
+	ippdrv->ops[EXYNOS_DRM_OPS_SRC] = &gsc_src_ops;
+	ippdrv->ops[EXYNOS_DRM_OPS_DST] = &gsc_dst_ops;
+	ippdrv->check_property = gsc_ippdrv_check_property;
+	ippdrv->reset = gsc_ippdrv_reset;
+	ippdrv->start = gsc_ippdrv_start;
+	ippdrv->stop = gsc_ippdrv_stop;
+	ret = gsc_init_prop_list(ippdrv);
+	if (ret < 0) {
+		dev_err(dev, "failed to init property list.\n");
+		goto err_get_irq;
+	}
+
+	DRM_DEBUG_KMS("%s:id[%d]ippdrv[0x%x]\n", __func__, ctx->id,
+		(int)ippdrv);
+
+	mutex_init(&ctx->lock);
+	platform_set_drvdata(pdev, ctx);
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	ret = exynos_drm_ippdrv_register(ippdrv);
+	if (ret < 0) {
+		dev_err(dev, "failed to register drm gsc device.\n");
+		goto err_ippdrv_register;
+	}
+
+	dev_info(&pdev->dev, "drm gsc registered successfully.\n");
+
+	return 0;
+
+err_ippdrv_register:
+	devm_kfree(dev, ippdrv->prop_list);
+	pm_runtime_disable(dev);
+err_get_irq:
+	free_irq(ctx->irq, ctx);
+err_get_regs:
+	devm_iounmap(dev, ctx->regs);
+err_clk:
+	clk_put(ctx->gsc_clk);
+err_ctx:
+	devm_kfree(dev, ctx);
+	return ret;
+}
+
+static int __devexit gsc_remove(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct gsc_context *ctx = get_gsc_context(dev);
+	struct exynos_drm_ippdrv *ippdrv = &ctx->ippdrv;
+
+	devm_kfree(dev, ippdrv->prop_list);
+	exynos_drm_ippdrv_unregister(ippdrv);
+	mutex_destroy(&ctx->lock);
+
+	pm_runtime_set_suspended(dev);
+	pm_runtime_disable(dev);
+
+	free_irq(ctx->irq, ctx);
+	devm_iounmap(dev, ctx->regs);
+
+	clk_put(ctx->gsc_clk);
+
+	devm_kfree(dev, ctx);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int gsc_suspend(struct device *dev)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+
+	DRM_DEBUG_KMS("%s:id[%d]\n", __func__, ctx->id);
+
+	if (pm_runtime_suspended(dev))
+		return 0;
+
+	return gsc_clk_ctrl(ctx, false);
+}
+
+static int gsc_resume(struct device *dev)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+
+	DRM_DEBUG_KMS("%s:id[%d]\n", __func__, ctx->id);
+
+	if (!pm_runtime_suspended(dev))
+		return gsc_clk_ctrl(ctx, true);
+
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_PM_RUNTIME
+static int gsc_runtime_suspend(struct device *dev)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+
+	DRM_DEBUG_KMS("%s:id[%d]\n", __func__, ctx->id);
+
+	return  gsc_clk_ctrl(ctx, false);
+}
+
+static int gsc_runtime_resume(struct device *dev)
+{
+	struct gsc_context *ctx = get_gsc_context(dev);
+
+	DRM_DEBUG_KMS("%s:id[%d]\n", __FILE__, ctx->id);
+
+	return  gsc_clk_ctrl(ctx, true);
+}
+#endif
+
+static const struct dev_pm_ops gsc_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(gsc_suspend, gsc_resume)
+	SET_RUNTIME_PM_OPS(gsc_runtime_suspend, gsc_runtime_resume, NULL)
+};
+
+struct platform_driver gsc_driver = {
+	.probe		= gsc_probe,
+	.remove		= __devexit_p(gsc_remove),
+	.driver		= {
+		.name	= "exynos-drm-gsc",
+		.owner	= THIS_MODULE,
+		.pm	= &gsc_pm_ops,
+	},
+};
+