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From: Boris BREZILLON <boris.brezillon@free-electrons.com>
To: Thierry Reding <thierry.reding@gmail.com>,
	Nicolas Ferre <nicolas.ferre@atmel.com>,
	David Airlie <airlied@linux.ie>,
	Samuel Ortiz <sameo@linux.intel.com>, Lee Jones <lee.jones@linaro.org>
Subject: [PATCH v2 3/7] drm: add Atmel HLCDC Display Controller support
Date: Mon,  9 Jun 2014 18:04:16 +0200
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	Jean-Jacques Hiblot <jjhiblot@traphandler.com>,
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The Atmel HLCDC (High LCD Controller) IP available on some Atmel SoCs (i.e.
at91sam9n12, at91sam9x5 family or sama5d3 family) provides a display
controller device.

This display controller support at least one primary plane and might
provide several overlays and an hardware cursor depending on the IP
version.

Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com>
---
 .../devicetree/bindings/drm/atmel-hlcdc-dc.txt     |  59 ++
 drivers/gpu/drm/Kconfig                            |   2 +
 drivers/gpu/drm/Makefile                           |   1 +
 drivers/gpu/drm/atmel-hlcdc/Kconfig                |  11 +
 drivers/gpu/drm/atmel-hlcdc/Makefile               |   7 +
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c     | 529 ++++++++++++++++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c       | 477 ++++++++++++++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h       | 178 ++++++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c    | 701 +++++++++++++++++++++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h    | 417 ++++++++++++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c    | 351 +++++++++++
 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c    | 658 +++++++++++++++++++
 drivers/gpu/drm/atmel_hlcdc/Kconfig                |  11 +
 drivers/gpu/drm/atmel_hlcdc/Makefile               |   8 +
 14 files changed, 3410 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/drm/atmel-hlcdc-dc.txt
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/Kconfig
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/Makefile
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c
 create mode 100644 drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
 create mode 100644 drivers/gpu/drm/atmel_hlcdc/Kconfig
 create mode 100644 drivers/gpu/drm/atmel_hlcdc/Makefile

diff --git a/Documentation/devicetree/bindings/drm/atmel-hlcdc-dc.txt b/Documentation/devicetree/bindings/drm/atmel-hlcdc-dc.txt
new file mode 100644
index 0000000..594bdb2
--- /dev/null
+++ b/Documentation/devicetree/bindings/drm/atmel-hlcdc-dc.txt
@@ -0,0 +1,59 @@
+Device-Tree bindings for Atmel's HLCDC (High LCD Controller) DRM driver
+
+The Atmel HLCDC Display Controller is subdevice of the HLCDC MFD device.
+See Documentation/devicetree/bindings/mfd/atmel-hlcdc.txt for more details.
+
+Required properties:
+ - compatible: value should be one of the following:
+   "atmel,hlcdc-dc"
+ - interrupts: the HLCDC interrupt definition
+ - pinctrl-names: the pin control state names. Should contain "default",
+   "rgb-444", "rgb-565", "rgb-666" and "rgb-888".
+ - pinctrl-[0-4]: should contain the pinctrl states described by pinctrl
+   names.
+ - atmel,panel: Should contain a phandle with 2 parameters.
+   The first cell is a phandle to a DRM panel device
+   The second cell encodes the RGB mode, which can take the following values:
+   * 0: RGB444
+   * 1: RGB565
+   * 2: RGB666
+   * 3: RGB888
+   The third cell encodes specific flags describing LCD signals configuration
+   (see Atmel's datasheet for a full description of these fields):
+   * bit 0: HSPOL: Horizontal Synchronization Pulse Polarity
+   * bit 1: VSPOL: Vertical Synchronization Pulse Polarity
+   * bit 2: VSPDLYS: Vertical Synchronization Pulse Start
+   * bit 3: VSPDLYE: Vertical Synchronization Pulse End
+   * bit 4: DISPPOL: Display Signal Polarity
+   * bit 7: DISPDLY: LCD Controller Display Power Signal Synchronization
+   * bit 12: VSPSU: LCD Controller Vertical synchronization Pulse Setup Configuration
+   * bit 13: VSPHO: LCD Controller Vertical synchronization Pulse Hold Configuration
+   * bit 16-20: GUARDTIME: LCD DISPLAY Guard Time
+
+Example:
+
+	hlcdc: hlcdc@f0030000 {
+		compatible = "atmel,sama5d3-hlcdc";
+		reg = <0xf0030000 0x2000>;
+		clocks = <&lcdc_clk>, <&lcdck>, <&clk32k>;
+		clock-names = "periph_clk","sys_clk", "slow_clk";
+		status = "disabled";
+
+		hlcdc-display-controller {
+			compatible = "atmel,hlcdc-dc";
+			interrupts = <36 IRQ_TYPE_LEVEL_HIGH 0>;
+			pinctrl-names = "default", "rgb-444", "rgb-565", "rgb-666", "rgb-888";
+			pinctrl-0 = <&pinctrl_lcd_base>;
+			pinctrl-1 = <&pinctrl_lcd_base &pinctrl_lcd_rgb444>;
+			pinctrl-2 = <&pinctrl_lcd_base &pinctrl_lcd_rgb565>;
+			pinctrl-3 = <&pinctrl_lcd_base &pinctrl_lcd_rgb666>;
+			pinctrl-4 = <&pinctrl_lcd_base &pinctrl_lcd_rgb888>;
+		};
+
+		hlcdc_pwm: hlcdc-pwm {
+			compatible = "atmel,hlcdc-pwm";
+			pinctrl-names = "default";
+			pinctrl-0 = <&pinctrl_lcd_pwm>;
+			#pwm-cells = <3>;
+		};
+	};
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index d1cc2f6..df6f0c1 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -182,6 +182,8 @@ source "drivers/gpu/drm/cirrus/Kconfig"
 
 source "drivers/gpu/drm/armada/Kconfig"
 
+source "drivers/gpu/drm/atmel-hlcdc/Kconfig"
+
 source "drivers/gpu/drm/rcar-du/Kconfig"
 
 source "drivers/gpu/drm/shmobile/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 48e38ba..28c8a61 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_DRM_GMA500) += gma500/
 obj-$(CONFIG_DRM_UDL) += udl/
 obj-$(CONFIG_DRM_AST) += ast/
 obj-$(CONFIG_DRM_ARMADA) += armada/
+obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel-hlcdc/
 obj-$(CONFIG_DRM_RCAR_DU) += rcar-du/
 obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/
 obj-$(CONFIG_DRM_OMAP)	+= omapdrm/
diff --git a/drivers/gpu/drm/atmel-hlcdc/Kconfig b/drivers/gpu/drm/atmel-hlcdc/Kconfig
new file mode 100644
index 0000000..bc07315
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/Kconfig
@@ -0,0 +1,11 @@
+config DRM_ATMEL_HLCDC
+	tristate "DRM Support for ATMEL HLCDC Display Controller"
+	depends on DRM && OF && MFD_ATMEL_HLCDC && COMMON_CLK
+	select DRM_GEM_CMA_HELPER
+	select DRM_KMS_HELPER
+	select DRM_KMS_FB_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_PANEL
+	help
+	  Choose this option if you have an ATMEL SoC with an HLCDC display
+	  controller (i.e. at91sam9n12, at91sam9x5 family or sama5d3 family).
diff --git a/drivers/gpu/drm/atmel-hlcdc/Makefile b/drivers/gpu/drm/atmel-hlcdc/Makefile
new file mode 100644
index 0000000..bf9fe0b
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/Makefile
@@ -0,0 +1,7 @@
+atmel-hlcdc-dc-y := atmel_hlcdc_crtc.o \
+		atmel_hlcdc_dc.o \
+		atmel_hlcdc_layer.o \
+		atmel_hlcdc_panel.o \
+		atmel_hlcdc_plane.o
+
+obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel-hlcdc-dc.o
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
new file mode 100644
index 0000000..a18492e
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c
@@ -0,0 +1,529 @@
+/*
+ * Copyright (C) 2014 Traphandler
+ * Copyright (C) 2014 Free Electrons
+ *
+ * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drmP.h>
+
+#include <video/videomode.h>
+
+#include "atmel_hlcdc_dc.h"
+
+/**
+ * Structure storing hardware cursor informations like its position, its size
+ * or the GEM object currently used to display the HW cursor.
+ *
+ * @gem: the cursor GEM object
+ * @pitch: GEM object pitch
+ * @height: cursor height in pixels
+ * @width: cursor width in pixels
+ * @x: cursor x position
+ * @y: cursor y position
+ * @offset: start offset from the provided buffer
+ * @patched_height: patched height value after adapting the image size
+ *		    depending on cursor position
+ * @patched_width: patched width value after adapting the image size depending
+ *		   on cursor position
+ * @patched_x: patched x value after adapting to cursor position (positive
+ *             value)
+ * @patched_y: patched x value after adapting to cursor position (positive
+ *             value)
+ */
+struct atmel_hlcdc_crtc_cursor_info {
+	struct drm_gem_cma_object *gem;
+	unsigned int pitch;
+	u32 height;
+	u32 width;
+	int x;
+	int y;
+
+	/*
+	 * These fields are automatically calculated by
+	 * atmel_hlcdc_crtc_cursor_prepare_req.
+	 */
+	unsigned int offset;
+	u32 patched_height;
+	u32 patched_width;
+	int patched_x;
+	int patched_y;
+};
+
+/**
+ * Structure storing HW cursor status.
+ *
+ * @status: the current cursor status
+ * @req: the requested cursor changes
+ * @plane: the hardware cursor plane
+ * @lock: cursor lock held when modifying cursor req or status
+ */
+struct atmel_hlcdc_crtc_cursor {
+	struct atmel_hlcdc_crtc_cursor_info status;
+	struct atmel_hlcdc_crtc_cursor_info req;
+	struct atmel_hlcdc_plane *plane;
+	struct mutex lock;
+};
+
+/**
+ * Atmel HLCDC CRTC structure
+ *
+ * @base: base DRM CRTC structure
+ * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
+ * @event: pointer to the current page flip event
+ * @id: CRTC id (returned by drm_crtc_index)
+ * @dpms: DPMS mode
+ * @cursor: hardware cursor status
+ */
+struct atmel_hlcdc_crtc {
+	struct drm_crtc base;
+	struct atmel_hlcdc *hlcdc;
+	struct drm_pending_vblank_event *event;
+	int id;
+	int dpms;
+	struct atmel_hlcdc_crtc_cursor cursor;
+};
+
+static inline struct atmel_hlcdc_crtc *
+drm_crtc_to_atmel_hlcdc_crtc(struct drm_crtc *crtc)
+{
+	return container_of(crtc, struct atmel_hlcdc_crtc, base);
+}
+
+
+static void atmel_hlcdc_crtc_dpms(struct drm_crtc *c, int mode)
+{
+	struct drm_device *dev = c->dev;
+
+	if (mode != DRM_MODE_DPMS_ON)
+		mode = DRM_MODE_DPMS_OFF;
+
+	pm_runtime_get_sync(dev->dev);
+
+	if (mode == DRM_MODE_DPMS_ON)
+		pm_runtime_forbid(dev->dev);
+	else
+		pm_runtime_allow(dev->dev);
+
+	pm_runtime_put_sync(dev->dev);
+}
+
+static int atmel_hlcdc_crtc_mode_set(struct drm_crtc *c,
+				     struct drm_display_mode *mode,
+				     struct drm_display_mode *adjusted,
+				     int x, int y,
+				     struct drm_framebuffer *old_fb)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct regmap *regmap = crtc->hlcdc->regmap;
+	struct drm_plane *plane = c->primary;
+	struct drm_framebuffer *fb;
+	struct videomode vm;
+
+	vm.vfront_porch = mode->vsync_start - mode->vdisplay;
+	vm.vback_porch = mode->vtotal - mode->vsync_end;
+	vm.vsync_len = mode->vsync_end - mode->vsync_start;
+	vm.hfront_porch = mode->hsync_start - mode->hdisplay;
+	vm.hback_porch = mode->htotal - mode->hsync_end;
+	vm.hsync_len = mode->hsync_end - mode->hsync_start;
+
+	if (vm.hsync_len > 0x40 || vm.hsync_len < 0 ||
+	    vm.vsync_len > 0x40 || vm.vsync_len < 0 ||
+	    vm.vfront_porch > 0x40 || vm.vfront_porch < 0 ||
+	    vm.vback_porch > 0x40 || vm.vback_porch < 0 ||
+	    vm.hfront_porch > 0x200 || vm.hfront_porch < 0 ||
+	    vm.hback_porch > 0x200 || vm.hback_porch < 0 ||
+	    mode->hdisplay > 2048 || mode->hdisplay < 0 ||
+	    mode->vdisplay > 2048 || mode->vdisplay < 0)
+		return -EINVAL;
+
+	regmap_write(regmap, ATMEL_HLCDC_CFG(1),
+		     (vm.hsync_len - 1) | ((vm.vsync_len - 1) << 16));
+
+	regmap_write(regmap, ATMEL_HLCDC_CFG(2),
+		     (vm.vfront_porch - 1) | ((vm.vback_porch - 1) << 16));
+
+	regmap_write(regmap, ATMEL_HLCDC_CFG(3),
+		     (vm.hfront_porch - 1) | ((vm.hback_porch - 1) << 16));
+
+	regmap_write(regmap, ATMEL_HLCDC_CFG(4),
+		     (mode->hdisplay - 1) | ((mode->vdisplay - 1) << 16));
+
+	fb = plane->fb;
+	plane->fb = old_fb;
+
+	return plane->funcs->update_plane(plane, c, fb,
+					  0, 0,
+					  mode->hdisplay, mode->vdisplay,
+					  c->x << 16, c->y << 16,
+					  mode->hdisplay << 16,
+					  mode->vdisplay << 16);
+}
+
+static void atmel_hlcdc_crtc_prepare(struct drm_crtc *crtc)
+{
+	atmel_hlcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
+}
+
+static void atmel_hlcdc_crtc_commit(struct drm_crtc *crtc)
+{
+	atmel_hlcdc_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
+}
+
+static bool atmel_hlcdc_crtc_mode_fixup(struct drm_crtc *crtc,
+					const struct drm_display_mode *mode,
+					struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+
+static const struct drm_crtc_helper_funcs lcdc_crtc_helper_funcs = {
+
+	.mode_fixup = atmel_hlcdc_crtc_mode_fixup,
+	.dpms = atmel_hlcdc_crtc_dpms,
+	.mode_set = atmel_hlcdc_crtc_mode_set,
+	.prepare = atmel_hlcdc_crtc_prepare,
+	.commit = atmel_hlcdc_crtc_commit,
+};
+
+static void atmel_hlcdc_crtc_destroy(struct drm_crtc *c)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+
+	drm_crtc_cleanup(c);
+	kfree(crtc);
+}
+
+void atmel_hlcdc_crtc_cancel_page_flip(struct drm_crtc *c,
+				       struct drm_file *file)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct drm_pending_vblank_event *event;
+	struct drm_device *dev = c->dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->event_lock, flags);
+	event = crtc->event;
+	if (event && event->base.file_priv == file) {
+		event->base.destroy(&event->base);
+		drm_vblank_put(dev, crtc->id);
+		crtc->event = NULL;
+	}
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
+static void atmel_hlcdc_crtc_finish_page_flip(void *data)
+{
+	struct atmel_hlcdc_crtc *crtc = data;
+	struct drm_device *dev = crtc->base.dev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dev->event_lock, flags);
+	if (crtc->event) {
+		drm_send_vblank_event(dev, crtc->id, crtc->event);
+		drm_vblank_put(dev, crtc->id);
+		crtc->event = NULL;
+	}
+	spin_unlock_irqrestore(&dev->event_lock, flags);
+}
+
+static int atmel_hlcdc_crtc_page_flip(struct drm_crtc *c,
+				      struct drm_framebuffer *fb,
+				      struct drm_pending_vblank_event *event,
+				      uint32_t page_flip_flags)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct drm_plane *plane = c->primary;
+
+	if (crtc->event)
+		return -EBUSY;
+
+	if (event) {
+		crtc->event = event;
+		drm_vblank_get(c->dev, crtc->id);
+	}
+
+	return plane->funcs->update_plane(plane, c, fb,
+					  0, 0,
+					  c->mode.hdisplay, c->mode.vdisplay,
+					  c->x << 16, c->y << 16,
+					  c->mode.hdisplay << 16,
+					  c->mode.vdisplay << 16);
+}
+
+static void atmel_hlcdc_crtc_cursor_prepare_req(struct atmel_hlcdc_crtc *crtc)
+{
+	int bpp = drm_format_plane_cpp(DRM_FORMAT_ARGB8888, 0);
+	struct atmel_hlcdc_crtc_cursor_info *info = &crtc->cursor.req;
+	int x_offset = 0;
+	int y_offset = 0;
+
+	if (!info->gem) {
+		info->width = 0;
+		info->height = 0;
+		info->pitch = 0;
+		info->offset = 0;
+		return;
+	}
+
+	info->pitch = info->width * bpp;
+
+	if (info->x + info->width > crtc->base.mode.hdisplay)
+		info->patched_width = crtc->base.mode.hdisplay - info->x;
+	else
+		info->patched_width = info->width;
+
+	if (info->x < 0) {
+		info->patched_width += info->x;
+		x_offset = -info->x;
+		info->patched_x = 0;
+	} else {
+		info->patched_x = info->x;
+	}
+
+	if (info->y + info->height > crtc->base.mode.vdisplay)
+		info->patched_height = crtc->base.mode.vdisplay - info->y;
+	else
+		info->patched_height = info->height;
+
+	if (info->y < 0) {
+		info->patched_height += info->y;
+		y_offset = -info->y;
+		info->patched_y = 0;
+	} else {
+		info->patched_y = info->y;
+	}
+
+	info->offset = (x_offset * bpp) +
+		       (y_offset * info->pitch);
+}
+
+static int atmel_hlcdc_crtc_cursor_apply_req(struct atmel_hlcdc_crtc *crtc)
+{
+	struct atmel_hlcdc_plane *plane = crtc->cursor.plane;
+	struct atmel_hlcdc_crtc_cursor_info *req = &crtc->cursor.req;
+	struct atmel_hlcdc_crtc_cursor_info *status = &crtc->cursor.status;
+	int ret;
+
+	if (unlikely(!plane))
+		return -ENOTSUPP;
+
+	if (!req->gem ||
+	    !req->patched_width || !req->patched_height) {
+		ret = plane->base.funcs->disable_plane(&plane->base);
+
+		if (!ret)
+			goto out;
+		else
+			goto err;
+	}
+
+	ret = atmel_hlcdc_layer_update_start(&plane->layer);
+	if (ret)
+		return ret;
+
+	atmel_hlcdc_plane_update_general_settings(plane, DRM_FORMAT_ARGB8888);
+
+	ret = atmel_hlcdc_plane_update_format(plane, DRM_FORMAT_ARGB8888);
+	if (ret)
+		goto err;
+
+	ret = atmel_hlcdc_plane_update_pos_and_size(plane, &crtc->base,
+						    req->patched_x,
+						    req->patched_y,
+						    req->patched_width,
+						    req->patched_height,
+						    0, 0,
+						    req->patched_width,
+						    req->patched_height);
+	if (ret)
+		goto err;
+
+	ret = atmel_hlcdc_plane_update_buffers(plane,
+					       DRM_FORMAT_ARGB8888,
+					       &req->gem,
+					       &req->pitch,
+					       &req->offset,
+					       0, 0,
+					       req->patched_width,
+					       req->height);
+	if (ret)
+		goto err;
+
+	if (!plane->base.crtc)
+		plane->base.crtc = &crtc->base;
+
+	atmel_hlcdc_layer_update_commit(&plane->layer);
+
+out:
+	if (req->gem)
+		drm_gem_object_reference(&req->gem->base);
+
+	if (status->gem)
+		drm_gem_object_unreference_unlocked(&status->gem->base);
+
+	*status = *req;
+
+	return 0;
+
+err:
+	atmel_hlcdc_layer_update_rollback(&plane->layer);
+	return ret;
+}
+
+static int atmel_hlcdc_crtc_cursor_set(struct drm_crtc *c,
+				       struct drm_file *file_priv,
+				       uint32_t handle,
+				       uint32_t width, uint32_t height)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct atmel_hlcdc_plane *plane = crtc->cursor.plane;
+	struct drm_gem_cma_object *cma_gem = NULL;
+	int ret;
+
+	if (unlikely(!plane))
+		return -ENOTSUPP;
+
+	mutex_lock(&crtc->cursor.lock);
+
+	if (handle) {
+		struct drm_gem_object *gem;
+
+		gem = drm_gem_object_lookup(c->dev, file_priv, handle);
+		if (unlikely(!gem)) {
+			ret = -ENOENT;
+			goto out;
+		}
+
+		cma_gem = to_drm_gem_cma_obj(gem);
+	}
+
+	crtc->cursor.req = crtc->cursor.status;
+
+	crtc->cursor.req.gem = cma_gem;
+	crtc->cursor.req.width = width;
+	crtc->cursor.req.height = height;
+	atmel_hlcdc_crtc_cursor_prepare_req(crtc);
+
+	ret = atmel_hlcdc_crtc_cursor_apply_req(crtc);
+	if (cma_gem)
+		drm_gem_object_unreference_unlocked(&cma_gem->base);
+
+out:
+	mutex_unlock(&crtc->cursor.lock);
+
+	return ret;
+}
+
+static int atmel_hlcdc_crtc_cursor_move(struct drm_crtc *c, int x, int y)
+{
+	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
+	struct atmel_hlcdc_plane *plane = crtc->cursor.plane;
+	int ret;
+
+	if (unlikely(!plane))
+		return -ENOTSUPP;
+
+	mutex_lock(&crtc->cursor.lock);
+	/*
+	 * If there's no cursor update pending, get the current
+	 * cursor size and buffer.
+	 */
+	crtc->cursor.req = crtc->cursor.status;
+
+	crtc->cursor.req.x = x;
+	crtc->cursor.req.y = y;
+	atmel_hlcdc_crtc_cursor_prepare_req(crtc);
+
+	ret = atmel_hlcdc_crtc_cursor_apply_req(crtc);
+	mutex_unlock(&crtc->cursor.lock);
+
+	return ret;
+}
+
+static const struct drm_crtc_funcs atmel_hlcdc_crtc_funcs = {
+	.page_flip = atmel_hlcdc_crtc_page_flip,
+	.set_config = drm_crtc_helper_set_config,
+	.destroy = atmel_hlcdc_crtc_destroy,
+};
+
+static const struct drm_crtc_funcs atmel_hlcdc_crtc_with_cursor_funcs = {
+	.page_flip = atmel_hlcdc_crtc_page_flip,
+	.set_config = drm_crtc_helper_set_config,
+	.destroy = atmel_hlcdc_crtc_destroy,
+	.cursor_set = atmel_hlcdc_crtc_cursor_set,
+	.cursor_move = atmel_hlcdc_crtc_cursor_move,
+};
+
+int atmel_hlcdc_crtc_create(struct drm_device *dev)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	struct atmel_hlcdc_planes *planes = dc->planes;
+	const struct drm_crtc_funcs *funcs;
+	struct atmel_hlcdc_crtc *crtc;
+	int ret;
+	int i;
+
+	crtc = kzalloc(sizeof(*crtc), GFP_KERNEL);
+	if (!crtc) {
+		dev_err(dev->dev, "allocation failed\n");
+		return -ENOMEM;
+	}
+
+	mutex_init(&crtc->cursor.lock);
+	crtc->hlcdc = dc->hlcdc;
+	crtc->cursor.plane = planes->cursor;
+
+	if (planes->cursor)
+		funcs = &atmel_hlcdc_crtc_with_cursor_funcs;
+	else
+		funcs = &atmel_hlcdc_crtc_funcs;
+
+	ret = drm_crtc_init_with_planes(dev, &crtc->base,
+				&planes->primary->base,
+				planes->cursor ? &planes->cursor->base : NULL,
+				funcs);
+	if (ret < 0)
+		goto fail;
+
+	atmel_hlcdc_layer_set_finished(&planes->primary->layer,
+				       atmel_hlcdc_crtc_finish_page_flip,
+				       crtc);
+
+	crtc->id = drm_crtc_index(&crtc->base);
+
+	if (planes->cursor)
+		planes->cursor->base.possible_crtcs = 1 << crtc->id;
+
+	for (i = 0; i < planes->noverlays; i++)
+		planes->overlays[i]->base.possible_crtcs = 1 << crtc->id;
+
+	drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);
+
+	return 0;
+
+fail:
+	atmel_hlcdc_crtc_destroy(&crtc->base);
+	return ret;
+}
+
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
new file mode 100644
index 0000000..e4ce24e
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
@@ -0,0 +1,477 @@
+/*
+ * Copyright (C) 2014 Traphandler
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/irq.h>
+#include <linux/irqchip.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+
+#include "atmel_hlcdc_dc.h"
+
+#define ATMEL_HLCDC_LAYER_IRQS_OFFSET		8
+
+static irqreturn_t atmel_hlcdc_dc_irq_handler(int irq, void *data)
+{
+	struct drm_device *dev = data;
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	unsigned long status;
+	unsigned int imr, isr;
+	int bit;
+
+	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_IMR, &imr);
+	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_ISR, &isr);
+	status = imr & isr;
+	if (!status)
+		return IRQ_NONE;
+
+	bit = ATMEL_HLCDC_LAYER_IRQS_OFFSET;
+	for_each_set_bit_from(bit, &status, ATMEL_HLCDC_LAYER_IRQS_OFFSET +
+					    ATMEL_HLCDC_MAX_LAYERS) {
+		int layerid = bit - ATMEL_HLCDC_LAYER_IRQS_OFFSET;
+		struct atmel_hlcdc_layer *layer = dc->layers[layerid];
+
+		if (layer)
+			atmel_hlcdc_layer_irq(layer);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static struct drm_framebuffer *atmel_hlcdc_fb_create(struct drm_device *dev,
+		struct drm_file *file_priv, struct drm_mode_fb_cmd2 *mode_cmd)
+{
+	return drm_fb_cma_create(dev, file_priv, mode_cmd);
+}
+
+static void atmel_hlcdc_fb_output_poll_changed(struct drm_device *dev)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+
+	if (dc->fbdev)
+		drm_fbdev_cma_hotplug_event(dc->fbdev);
+}
+
+static const struct drm_mode_config_funcs mode_config_funcs = {
+	.fb_create = atmel_hlcdc_fb_create,
+	.output_poll_changed = atmel_hlcdc_fb_output_poll_changed,
+};
+
+static int atmel_hlcdc_dc_modeset_init(struct drm_device *dev)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	struct atmel_hlcdc_planes *planes;
+	int ret;
+	int i;
+
+	drm_mode_config_init(dev);
+
+	ret = atmel_hlcdc_panel_create(dev);
+	if (ret) {
+		dev_err(dev->dev, "failed to create panel: %d\n", ret);
+		return ret;
+	}
+
+	planes = atmel_hlcdc_create_planes(dev);
+	if (IS_ERR(planes)) {
+		dev_err(dev->dev, "failed to create planes\n");
+		return PTR_ERR(planes);
+	}
+
+	dc->planes = planes;
+
+	dc->layers[planes->primary->layer.desc->id] =
+						&planes->primary->layer;
+
+	if (planes->cursor)
+		dc->layers[planes->cursor->layer.desc->id] =
+							&planes->cursor->layer;
+
+	for (i = 0; i < planes->noverlays; i++)
+		dc->layers[planes->overlays[i]->layer.desc->id] =
+						&planes->overlays[i]->layer;
+
+	ret = atmel_hlcdc_crtc_create(dev);
+	if (ret) {
+		dev_err(dev->dev, "failed to create crtc\n");
+		return ret;
+	}
+
+	dev->mode_config.min_width = dc->desc->min_width;
+	dev->mode_config.min_height = dc->desc->min_height;
+	dev->mode_config.max_width = dc->desc->max_width;
+	dev->mode_config.max_height = dc->desc->max_height;
+	dev->mode_config.funcs = &mode_config_funcs;
+
+	return 0;
+}
+
+static int atmel_hlcdc_dc_load(struct drm_device *dev, unsigned long flags)
+{
+	struct platform_device *pdev = dev->platformdev;
+	const struct atmel_hlcdc_dc_desc *desc;
+	struct atmel_hlcdc_dc *dc;
+	int ret;
+
+	desc = platform_get_drvdata(pdev);
+
+	dc = devm_kzalloc(dev->dev, sizeof(*dc), GFP_KERNEL);
+	if (!dc) {
+		dev_err(dev->dev, "failed to allocate private data\n");
+		return -ENOMEM;
+	}
+
+	dc->desc = platform_get_drvdata(pdev);
+	dc->hlcdc = dev_get_drvdata(dev->dev->parent);
+	dev->dev_private = dc;
+
+	ret = clk_prepare_enable(dc->hlcdc->periph_clk);
+	if (ret) {
+		dev_err(dev->dev, "failed to enable periph_clk\n");
+		return ret;
+	}
+
+	pm_runtime_enable(dev->dev);
+
+	pm_runtime_put_sync(dev->dev);
+
+	ret = atmel_hlcdc_dc_modeset_init(dev);
+	if (ret < 0) {
+		dev_err(dev->dev, "failed to initialize mode setting\n");
+		goto err_periph_clk_disable;
+	}
+
+	ret = drm_vblank_init(dev, 1);
+	if (ret < 0) {
+		dev_err(dev->dev, "failed to initialize vblank\n");
+		goto err_periph_clk_disable;
+	}
+
+	pm_runtime_get_sync(dev->dev);
+	ret = drm_irq_install(dev);
+	pm_runtime_put_sync(dev->dev);
+	if (ret < 0) {
+		dev_err(dev->dev, "failed to install IRQ handler\n");
+		goto err_periph_clk_disable;
+	}
+
+	platform_set_drvdata(pdev, dev);
+
+	drm_kms_helper_poll_init(dev);
+
+	dc->fbdev = drm_fbdev_cma_init(dev, 24,
+			dev->mode_config.num_crtc,
+			dev->mode_config.num_connector);
+
+	if (IS_ERR(dc->fbdev)) {
+		ret = PTR_ERR(dc->fbdev);
+		goto err_periph_clk_disable;
+	}
+
+	return 0;
+
+err_periph_clk_disable:
+	clk_disable_unprepare(dc->hlcdc->periph_clk);
+
+	return ret;
+}
+
+static int atmel_hlcdc_dc_unload(struct drm_device *dev)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+
+	drm_kms_helper_poll_fini(dev);
+	drm_mode_config_cleanup(dev);
+	drm_vblank_cleanup(dev);
+
+	pm_runtime_get_sync(dev->dev);
+	drm_irq_uninstall(dev);
+	pm_runtime_put_sync(dev->dev);
+
+	dev->dev_private = NULL;
+
+	pm_runtime_disable(dev->dev);
+	clk_disable_unprepare(dc->hlcdc->periph_clk);
+
+	return 0;
+}
+
+static void atmel_hlcdc_dc_preclose(struct drm_device *dev,
+				    struct drm_file *file)
+{
+	struct drm_crtc *crtc;
+
+	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
+		atmel_hlcdc_crtc_cancel_page_flip(crtc, file);
+}
+
+static void atmel_hlcdc_dc_lastclose(struct drm_device *dev)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+
+	drm_fbdev_cma_restore_mode(dc->fbdev);
+}
+
+static void atmel_hlcdc_dc_irq_preinstall(struct drm_device *dev)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	unsigned int isr;
+
+	regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IDR, 0xffffffff);
+	regmap_read(dc->hlcdc->regmap, ATMEL_HLCDC_ISR, &isr);
+}
+
+static int atmel_hlcdc_dc_irq_postinstall(struct drm_device *dev)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	int i;
+
+	/* Enable interrupts on activated layers */
+	for (i = 0; i < ATMEL_HLCDC_MAX_LAYERS; i++) {
+		if (dc->layers[i])
+			regmap_write(dc->hlcdc->regmap, ATMEL_HLCDC_IER,
+				     BIT(i + 8));
+	}
+
+	return 0;
+}
+
+static void atmel_hlcdc_dc_irq_uninstall(struct drm_device *dev)
+{
+
+}
+
+static int atmel_hlcdc_dc_enable_vblank(struct drm_device *dev, int crtc)
+{
+	return 0;
+}
+
+static void atmel_hlcdc_dc_disable_vblank(struct drm_device *dev, int crtc)
+{
+}
+
+static const struct file_operations fops = {
+	.owner              = THIS_MODULE,
+	.open               = drm_open,
+	.release            = drm_release,
+	.unlocked_ioctl     = drm_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl       = drm_compat_ioctl,
+#endif
+	.poll               = drm_poll,
+	.read               = drm_read,
+	.llseek             = no_llseek,
+	.mmap               = drm_gem_cma_mmap,
+};
+
+static struct drm_driver atmel_hlcdc_dc_driver = {
+	.driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET,
+	.load = atmel_hlcdc_dc_load,
+	.unload = atmel_hlcdc_dc_unload,
+	.preclose = atmel_hlcdc_dc_preclose,
+	.lastclose = atmel_hlcdc_dc_lastclose,
+	.irq_handler = atmel_hlcdc_dc_irq_handler,
+	.irq_preinstall = atmel_hlcdc_dc_irq_preinstall,
+	.irq_postinstall = atmel_hlcdc_dc_irq_postinstall,
+	.irq_uninstall = atmel_hlcdc_dc_irq_uninstall,
+	.get_vblank_counter = drm_vblank_count,
+	.enable_vblank = atmel_hlcdc_dc_enable_vblank,
+	.disable_vblank = atmel_hlcdc_dc_disable_vblank,
+	.gem_free_object = drm_gem_cma_free_object,
+	.gem_vm_ops = &drm_gem_cma_vm_ops,
+	.dumb_create = drm_gem_cma_dumb_create,
+	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
+	.dumb_destroy = drm_gem_dumb_destroy,
+	.fops = &fops,
+	.name = "atmel-hlcdc",
+	.desc = "Atmel HLCD Controller DRM",
+	.date = "20141504",
+	.major = 1,
+	.minor = 0,
+};
+
+static const struct atmel_hlcdc_layer_desc atmel_hlcdc_sama5d3_layers[] = {
+	{
+		.name = "base",
+		.formats = &atmel_hlcdc_plane_rgb_formats,
+		.regs_offset = 0x40,
+		.id = 0,
+		.type = ATMEL_HLCDC_BASE_LAYER,
+		.nconfigs = 7,
+		.layout = {
+			.xstride = { 2 },
+			.default_color = 3,
+			.general_config = 4,
+			.disc_pos = 5,
+			.disc_size = 6,
+		},
+	},
+	{
+		.name = "overlay1",
+		.formats = &atmel_hlcdc_plane_rgb_formats,
+		.regs_offset = 0x140,
+		.id = 1,
+		.type = ATMEL_HLCDC_OVERLAY_LAYER,
+		.nconfigs = 10,
+		.layout = {
+			.pos = 2,
+			.size = 3,
+			.xstride = { 4 },
+			.pstride = { 5 },
+			.default_color = 6,
+			.chroma_key = 7,
+			.chroma_key_mask = 8,
+			.general_config = 9,
+		},
+	},
+	{
+		.name = "overlay2",
+		.formats = &atmel_hlcdc_plane_rgb_formats,
+		.regs_offset = 0x240,
+		.id = 2,
+		.type = ATMEL_HLCDC_OVERLAY_LAYER,
+		.nconfigs = 10,
+		.layout = {
+			.pos = 2,
+			.size = 3,
+			.xstride = { 4 },
+			.pstride = { 5 },
+			.default_color = 6,
+			.chroma_key = 7,
+			.chroma_key_mask = 8,
+			.general_config = 9,
+		},
+	},
+	{
+		.name = "high-end-overlay",
+		.formats = &atmel_hlcdc_plane_rgb_and_yuv_formats,
+		.regs_offset = 0x340,
+		.id = 3,
+		.type = ATMEL_HLCDC_OVERLAY_LAYER,
+		.nconfigs = 42,
+		.layout = {
+			.pos = 2,
+			.size = 3,
+			.memsize = 4,
+			.xstride = { 5, 7 },
+			.pstride = { 6, 8 },
+			.default_color = 9,
+			.chroma_key = 10,
+			.chroma_key_mask = 11,
+			.general_config = 12,
+		},
+	},
+	{
+		.name = "cursor",
+		.formats = &atmel_hlcdc_plane_rgb_formats,
+		.regs_offset = 0x440,
+		.id = 4,
+		.type = ATMEL_HLCDC_CURSOR_LAYER,
+		.nconfigs = 10,
+		.max_width = 128,
+		.max_height = 128,
+		.layout = {
+			.pos = 2,
+			.size = 3,
+			.xstride = { 4 },
+			.pstride = { 5 },
+			.default_color = 6,
+			.chroma_key = 7,
+			.chroma_key_mask = 8,
+			.general_config = 9,
+		},
+	},
+};
+
+static const struct atmel_hlcdc_dc_desc atmel_hlcdc_dc_sama5d3 = {
+	.min_width = 0,
+	.min_height = 0,
+	.max_width = 2048,
+	.max_height = 2048,
+	.nlayers = ARRAY_SIZE(atmel_hlcdc_sama5d3_layers),
+	.layers = atmel_hlcdc_sama5d3_layers,
+};
+
+static const struct of_device_id atmel_hlcdc_of_match[] = {
+	{
+		.compatible = "atmel,sama5d3-hlcdc",
+		.data = &atmel_hlcdc_dc_sama5d3
+	},
+	{ /* sentinel */ },
+};
+
+static int atmel_hlcdc_dc_drm_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *match;
+	int ret;
+
+	match = of_match_node(atmel_hlcdc_of_match, pdev->dev.parent->of_node);
+	if (!match) {
+		dev_err(&pdev->dev, "invalid compatible string\n");
+		return -ENODEV;
+	}
+
+	if (!match->data) {
+		dev_err(&pdev->dev, "invalid hlcdc description\n");
+		return -EINVAL;
+	}
+
+	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	platform_set_drvdata(pdev, (void *)match->data);
+
+	ret = drm_platform_init(&atmel_hlcdc_dc_driver, pdev);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
+{
+	drm_put_dev(platform_get_drvdata(pdev));
+
+	return 0;
+}
+
+static const struct of_device_id atmel_hlcdc_dc_of_match[] = {
+	{ .compatible = "atmel,hlcdc-dc" },
+	{ },
+};
+
+static struct platform_driver atmel_hlcdc_dc_platform_driver = {
+	.probe	= atmel_hlcdc_dc_drm_probe,
+	.remove	= atmel_hlcdc_dc_drm_remove,
+	.driver	= {
+		.name	= "atmel-hlcdc-dc",
+		.owner	= THIS_MODULE,
+		.of_match_table = atmel_hlcdc_dc_of_match,
+	},
+};
+module_platform_driver(atmel_hlcdc_dc_platform_driver);
+
+MODULE_AUTHOR("Jean-Jacques Hiblot <jjhiblot@traphandler.com>");
+MODULE_AUTHOR("Boris BREZILLON <boris.brezillon@free-electrons.com>");
+MODULE_DESCRIPTION("Atmel HLCDC Display Controller DRM Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:atmel-hlcdc-dc");
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
new file mode 100644
index 0000000..5d2919e
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.h
@@ -0,0 +1,178 @@
+/*
+ * Copyright (C) 2014 Traphandler
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DRM_ATMEL_HLCDC_H
+#define DRM_ATMEL_HLCDC_H
+
+#include <linux/clk.h>
+#include <linux/irqdomain.h>
+#include <linux/pwm.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_panel.h>
+#include <drm/drmP.h>
+
+#include "atmel_hlcdc_layer.h"
+
+#define ATMEL_HLCDC_MAX_LAYERS		5
+
+/**
+ * Atmel HLCDC Display Controller description structure.
+ *
+ * This structure describe the HLCDC IP capabilities and depends on the
+ * HLCDC IP version (or Atmel SoC family).
+ *
+ * @min_width: minimum width supported by the Display Controller
+ * @min_height: minimum height supported by the Display Controller
+ * @max_width: maximum width supported by the Display Controller
+ * @max_height: maximum height supported by the Display Controller
+ * @layer: a layer description table describing available layers
+ * @nlayers: layer description table size
+ */
+struct atmel_hlcdc_dc_desc {
+	int min_width;
+	int min_height;
+	int max_width;
+	int max_height;
+	const struct atmel_hlcdc_layer_desc *layers;
+	int nlayers;
+};
+
+/**
+ * Atmel HLCDC Plane properties.
+ *
+ * This structure stores plane property definitions.
+ *
+ * @alpha: alpha blending (or transparency) property
+ */
+struct atmel_hlcdc_plane_properties {
+	struct drm_property *alpha;
+};
+
+/**
+ * Atmel HLCDC Plane.
+ *
+ * @base: base DRM plane structure
+ * @layer: HLCDC layer structure
+ * @properties: pointer to the property definitions structure
+ * @alpha: current alpha blending (or transparency) status
+ */
+struct atmel_hlcdc_plane {
+	struct drm_plane base;
+	struct atmel_hlcdc_layer layer;
+	struct atmel_hlcdc_plane_properties *properties;
+	u8 alpha;
+};
+
+static inline struct atmel_hlcdc_plane *
+drm_plane_to_atmel_hlcdc_plane(struct drm_plane *p)
+{
+	return container_of(p, struct atmel_hlcdc_plane, base);
+}
+
+static inline struct atmel_hlcdc_plane *
+atmel_hlcdc_layer_to_plane(struct atmel_hlcdc_layer *l)
+{
+	return container_of(l, struct atmel_hlcdc_plane, layer);
+}
+
+/**
+ * Atmel HLCDC Planes.
+ *
+ * This structure stores the instantiated HLCDC Planes and can be accessed by
+ * the HLCDC Display Controller or the HLCDC CRTC.
+ *
+ * @primary: primary plane
+ * @cursor: hardware cursor plane
+ * @overlays: overlay plane table
+ * @noverlays: number of overlay planes
+ */
+struct atmel_hlcdc_planes {
+	struct atmel_hlcdc_plane *primary;
+	struct atmel_hlcdc_plane *cursor;
+	struct atmel_hlcdc_plane **overlays;
+	int noverlays;
+};
+
+/**
+ * Atmel HLCDC Display Controller.
+ *
+ * @desc: HLCDC Display Controller description
+ * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
+ * @fbdev: framebuffer device attached to the Display Controller
+ * @planes: instantiated planes
+ * @layers: active HLCDC layer
+ */
+struct atmel_hlcdc_dc {
+	struct atmel_hlcdc_dc_desc *desc;
+	struct atmel_hlcdc *hlcdc;
+	struct drm_fbdev_cma *fbdev;
+	struct atmel_hlcdc_planes *planes;
+	struct atmel_hlcdc_layer *layers[ATMEL_HLCDC_MAX_LAYERS];
+};
+
+extern struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats;
+extern struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_and_yuv_formats;
+
+struct atmel_hlcdc_planes *
+atmel_hlcdc_create_planes(struct drm_device *dev);
+
+int atmel_hlcdc_plane_update_buffers(struct atmel_hlcdc_plane *plane,
+				     u32 pixel_format,
+				     struct drm_gem_cma_object **gems,
+				     unsigned int *pitches,
+				     unsigned int *offsets,
+				     uint32_t src_x, uint32_t src_y,
+				     uint32_t src_w, uint32_t src_h);
+
+void atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
+					       u32 format);
+
+int atmel_hlcdc_plane_update_format(struct atmel_hlcdc_plane *plane,
+				    u32 format);
+
+int atmel_hlcdc_plane_update_pos_and_size(struct atmel_hlcdc_plane *plane,
+					  struct drm_crtc *crtc,
+					  int crtc_x, int crtc_y,
+					  unsigned int crtc_w,
+					  unsigned int crtc_h,
+					  uint32_t src_x, uint32_t src_y,
+					  uint32_t src_w, uint32_t src_h);
+
+void atmel_hlcdc_crtc_cancel_page_flip(struct drm_crtc *crtc,
+				       struct drm_file *file);
+
+int atmel_hlcdc_crtc_create(struct drm_device *dev);
+
+int atmel_hlcdc_panel_create(struct drm_device *dev);
+
+struct atmel_hlcdc_pwm_chip *atmel_hlcdc_pwm_create(struct drm_device *dev,
+						    struct clk *slow_clk,
+						    struct clk *sys_clk,
+						    void __iomem *regs);
+
+int atmel_hlcdc_pwm_destroy(struct drm_device *dev,
+			    struct atmel_hlcdc_pwm_chip *chip);
+
+#endif /* DRM_ATMEL_HLCDC_H */
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c
new file mode 100644
index 0000000..b449fe1
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c
@@ -0,0 +1,701 @@
+/*
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+
+#include "atmel_hlcdc_dc.h"
+
+static void
+atmel_hlcdc_layer_gem_flip_release(struct atmel_hlcdc_layer *layer,
+				   struct atmel_hlcdc_layer_gem_flip *flip)
+{
+	int i;
+
+	for (i = 0; i < layer->max_planes; i++) {
+		if (!flip->gems[i])
+			break;
+
+		drm_gem_object_unreference_unlocked(flip->gems[i]);
+	}
+
+	kfree(flip);
+}
+
+static void atmel_hlcdc_layer_gc_work(struct work_struct *work)
+{
+	struct atmel_hlcdc_layer_gem_flip_gc *gc =
+			container_of(work,
+				     struct atmel_hlcdc_layer_gem_flip_gc,
+				     work);
+	struct atmel_hlcdc_layer *layer =
+			container_of(gc , struct atmel_hlcdc_layer, gc);
+
+	while (true) {
+		struct atmel_hlcdc_layer_gem_flip *flip;
+		unsigned long flags;
+
+		spin_lock_irqsave(&gc->list_lock, flags);
+		flip = list_first_entry_or_null(&gc->list,
+					struct atmel_hlcdc_layer_gem_flip,
+					node);
+		if (flip)
+			list_del(&flip->node);
+		spin_unlock_irqrestore(&gc->list_lock, flags);
+
+		if (!flip)
+			break;
+
+		atmel_hlcdc_layer_gem_flip_release(layer, flip);
+
+		mutex_lock(&gc->finished_lock);
+		if (gc->finished)
+			gc->finished(gc->finished_data);
+		mutex_unlock(&gc->finished_lock);
+	}
+}
+
+static void
+atmel_hlcdc_layer_gem_flip_put(struct atmel_hlcdc_layer *layer,
+			       struct atmel_hlcdc_layer_gem_flip *flip)
+{
+	struct atmel_hlcdc_layer_gem_flip_gc *gc = &layer->gc;
+	unsigned long flags;
+
+	if (--flip->remaining_gems <= 0) {
+		spin_lock_irqsave(&gc->list_lock, flags);
+		list_add_tail(&flip->node,
+			      &gc->list);
+		spin_unlock_irqrestore(&gc->list_lock, flags);
+		schedule_work(&gc->work);
+	}
+}
+
+static void atmel_hlcdc_layer_start_queue(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	const struct atmel_hlcdc_layer_desc *desc = layer->desc;
+	struct regmap *regmap = layer->hlcdc->regmap;
+	int i;
+
+	for (i = 0; i < layer->max_planes; i++) {
+		dma->cur[i] = dma->queue[i];
+		if (!dma->queue[i])
+			continue;
+		dma->queue[i] = NULL;
+
+		regmap_write(regmap,
+			     desc->regs_offset +
+			     ATMEL_HLCDC_LAYER_PLANE_ADDR(i),
+			     dma->cur[i]->addr);
+		regmap_write(regmap,
+			     desc->regs_offset +
+			     ATMEL_HLCDC_LAYER_PLANE_CTRL(i),
+			     dma->cur[i]->ctrl);
+		regmap_write(regmap,
+			     desc->regs_offset +
+			     ATMEL_HLCDC_LAYER_PLANE_NEXT(i),
+			     dma->cur[i]->next);
+	}
+}
+
+static void atmel_hlcdc_layer_update_apply(struct atmel_hlcdc_layer *layer)
+{
+	const struct atmel_hlcdc_layer_desc *desc = layer->desc;
+	struct atmel_hlcdc_layer_update *upd = &layer->update;
+	struct regmap *regmap = layer->hlcdc->regmap;
+	struct atmel_hlcdc_layer_update_slot *slot;
+	unsigned int cfg;
+	u32 action = 0;
+	int i;
+
+	if (upd->pending < 0 || upd->pending > 1)
+		return;
+
+	slot = &upd->slots[upd->pending];
+
+	for_each_set_bit(cfg, slot->updated_configs, layer->desc->nconfigs) {
+		regmap_write(regmap,
+			     desc->regs_offset +
+			     ATMEL_HLCDC_LAYER_CFG(layer, cfg),
+			     slot->configs[cfg]);
+		action |= ATMEL_HLCDC_LAYER_UPDATE;
+	}
+
+	if (slot->gem_flip && slot->gem_flip->remaining_gems) {
+		struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+
+		for (i = 0; i < layer->max_planes; i++) {
+			struct atmel_hlcdc_dma_channel_dscr *dscr;
+
+			if (!slot->gem_flip->gems[i])
+				break;
+
+			dscr =  slot->dscrs[i];
+			slot->dscrs[i] = NULL;
+
+			if (!dma->enabled) {
+				action |= ATMEL_HLCDC_LAYER_DMA_CHAN;
+				regmap_write(regmap,
+					     desc->regs_offset +
+					     ATMEL_HLCDC_LAYER_PLANE_ADDR(i),
+					     dscr->addr);
+				regmap_write(regmap,
+					     desc->regs_offset +
+					     ATMEL_HLCDC_LAYER_PLANE_CTRL(i),
+					     dscr->ctrl);
+				regmap_write(regmap,
+					     desc->regs_offset +
+					     ATMEL_HLCDC_LAYER_PLANE_NEXT(i),
+					     dscr->next);
+				dma->cur[i] = dscr;
+			} else {
+				action |= ATMEL_HLCDC_LAYER_A2Q;
+				regmap_write(regmap,
+					     desc->regs_offset +
+					     ATMEL_HLCDC_LAYER_PLANE_HEAD(i),
+					     dscr->next);
+				dma->queue[i] = dscr;
+			}
+		}
+
+		dma->enabled = true;
+		slot->gem_flip = NULL;
+	}
+
+	if (action)
+		regmap_write(regmap,
+			     desc->regs_offset + ATMEL_HLCDC_LAYER_CHER,
+			     action);
+
+	for (i = 0; i < layer->max_planes; i++) {
+		if (!slot->dscrs[i])
+			continue;
+
+		slot->dscrs[i]->gem_flip = NULL;
+		slot->dscrs[i] = NULL;
+	}
+
+	if (slot->gem_flip) {
+		atmel_hlcdc_layer_gem_flip_put(layer, slot->gem_flip);
+		slot->gem_flip = NULL;
+	}
+
+	bitmap_clear(slot->updated_configs, 0, layer->desc->nconfigs);
+	memset(slot->configs, 0,
+	       sizeof(*slot->configs) * layer->desc->nconfigs);
+
+	upd->pending = -1;
+}
+
+static bool
+atmel_hlcdc_layer_dma_channel_active(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	int i;
+
+	for (i = 0; i < layer->max_planes; i++) {
+		if (dma->cur[i])
+			return true;
+	}
+
+	return false;
+}
+
+void atmel_hlcdc_layer_irq(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_gem_flip *flip_gc[ATMEL_HLCDC_MAX_PLANES];
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	const struct atmel_hlcdc_layer_desc *desc = layer->desc;
+	struct regmap *regmap = layer->hlcdc->regmap;
+	struct atmel_hlcdc_dma_channel_dscr *dscr;
+	unsigned long flags;
+	unsigned int isr, imr;
+	unsigned int status;
+
+	int i;
+
+	regmap_read(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_IMR, &imr);
+	regmap_read(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_ISR, &isr);
+	status = imr & isr;
+	if (!status)
+		return;
+
+	memset(flip_gc, 0, sizeof(flip_gc));
+
+	spin_lock_irqsave(&dma->lock, flags);
+	for (i = 0; i < layer->max_planes; i++) {
+		if ((status & ATMEL_HLCDC_LAYER_DONE_IRQ(i)) ||
+		    (status & ATMEL_HLCDC_LAYER_ADD_IRQ(i))) {
+			dscr = dma->cur[i];
+			dma->cur[i] = NULL;
+			flip_gc[i] = dscr->gem_flip;
+			dscr->gem_flip = NULL;
+		}
+
+		if (status & ATMEL_HLCDC_LAYER_ADD_IRQ(i)) {
+			dma->cur[i] = dma->queue[i];
+			dma->queue[i] = NULL;
+		}
+	}
+
+	/*
+	 * The DMA channel might have been disabled before we were able to
+	 * add the new frame to the DMA transfer queue.
+	 * Try to re-enable the channel in this case.
+	 */
+	if (!atmel_hlcdc_layer_dma_channel_active(layer)) {
+		if (atmel_hlcdc_layer_dma_channel_busy(layer)) {
+			atmel_hlcdc_layer_start_queue(layer);
+
+			regmap_write(regmap,
+				     desc->regs_offset +
+				     ATMEL_HLCDC_LAYER_CHDR,
+				     ATMEL_HLCDC_LAYER_A2Q);
+			regmap_write(regmap,
+				     desc->regs_offset +
+				     ATMEL_HLCDC_LAYER_CHER,
+				     ATMEL_HLCDC_LAYER_DMA_CHAN);
+		} else {
+			dma->enabled = false;
+		}
+	}
+
+	if (!atmel_hlcdc_layer_dma_channel_busy(layer)) {
+		struct atmel_hlcdc_layer_update *upd = &layer->update;
+
+		spin_lock(&upd->pending_lock);
+		atmel_hlcdc_layer_update_apply(layer);
+		spin_unlock(&upd->pending_lock);
+	}
+	spin_unlock_irqrestore(&dma->lock, flags);
+
+	for (i = 0; i < layer->max_planes; i++) {
+		if (!flip_gc[i])
+			break;
+
+		atmel_hlcdc_layer_gem_flip_put(layer, flip_gc[i]);
+	}
+}
+
+int atmel_hlcdc_layer_disable(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	unsigned long flags;
+	int i;
+
+	spin_lock_irqsave(&dma->lock, flags);
+	for (i = 0; i < layer->max_planes; i++) {
+		if (!dma->cur[i])
+			break;
+
+		dma->cur[i]->ctrl = 0;
+	}
+	spin_unlock_irqrestore(&dma->lock, flags);
+
+	return 0;
+}
+
+void atmel_hlcdc_layer_set_finished(struct atmel_hlcdc_layer *layer,
+				    void (*finished)(void *data),
+				    void *data)
+{
+	struct atmel_hlcdc_layer_gem_flip_gc *gc = &layer->gc;
+
+	mutex_lock(&gc->finished_lock);
+	gc->finished = finished;
+	gc->finished_data = data;
+	mutex_unlock(&gc->finished_lock);
+}
+
+static void atmel_hlcdc_layer_update_reset(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	struct atmel_hlcdc_layer_update *upd = &layer->update;
+	struct atmel_hlcdc_layer_update_slot *slot;
+	unsigned long flags;
+	int i;
+
+	if (upd->next < 0 || upd->next > 1)
+		return;
+
+	slot = &upd->slots[upd->next];
+	bitmap_clear(slot->updated_configs, 0, layer->desc->nconfigs);
+	memset(slot->configs, 0,
+	       sizeof(*slot->configs) * layer->desc->nconfigs);
+
+	spin_lock_irqsave(&dma->lock, flags);
+	for (i = 0; i < layer->max_planes; i++) {
+		if (!slot->dscrs[i])
+			break;
+		slot->dscrs[i]->gem_flip = NULL;
+		slot->dscrs[i] = NULL;
+	}
+	spin_unlock_irqrestore(&layer->dma.lock, flags);
+
+	if (slot->gem_flip) {
+		atmel_hlcdc_layer_gem_flip_release(layer, slot->gem_flip);
+		slot->gem_flip = NULL;
+	}
+
+	upd->next = -1;
+}
+
+int atmel_hlcdc_layer_update_start(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	struct atmel_hlcdc_layer_update *upd = &layer->update;
+	struct regmap *regmap = layer->hlcdc->regmap;
+	struct atmel_hlcdc_layer_gem_flip *gem_flip;
+	struct atmel_hlcdc_layer_update_slot *slot;
+	unsigned long flags;
+	int i, j = 0;
+	int pending;
+
+	gem_flip = kzalloc(sizeof(*gem_flip), GFP_KERNEL);
+	if (!gem_flip)
+		return -ENOMEM;
+
+	mutex_lock(&upd->lock);
+
+	spin_lock_irqsave(&upd->pending_lock, flags);
+	pending = upd->pending;
+	spin_unlock_irqrestore(&upd->pending_lock, flags);
+
+	upd->next = pending ? 0 : 1;
+
+	slot = &upd->slots[upd->next];
+
+	spin_lock_irqsave(&dma->lock, flags);
+	for (i = 0; i < layer->max_planes * 4; i++) {
+		if (!dma->dscrs[i].gem_flip) {
+			slot->dscrs[j++] = &dma->dscrs[i];
+			dma->dscrs[i].gem_flip = gem_flip;
+			if (j == layer->max_planes)
+				break;
+		}
+	}
+
+	if (j < layer->max_planes) {
+		for (i = 0; i < j; i++)
+			slot->dscrs[i]->gem_flip = NULL;
+	}
+	spin_unlock_irqrestore(&layer->dma.lock, flags);
+
+	if (j < layer->max_planes) {
+		mutex_unlock(&upd->lock);
+		kfree(gem_flip);
+		return -EBUSY;
+	}
+
+	slot->gem_flip = gem_flip;
+
+	spin_lock_irqsave(&upd->pending_lock, flags);
+	pending = upd->pending;
+	if (pending >= 0) {
+		memcpy(upd->slots[upd->next].configs,
+		       upd->slots[upd->pending].configs,
+		       layer->desc->nconfigs * sizeof(u32));
+		memcpy(upd->slots[upd->next].updated_configs,
+		       upd->slots[upd->pending].updated_configs,
+		       DIV_ROUND_UP(layer->desc->nconfigs,
+				    BITS_PER_BYTE * sizeof(unsigned long)) *
+		       sizeof(unsigned long));
+	}
+	spin_unlock_irqrestore(&upd->pending_lock, flags);
+
+	if (pending < 0)
+		regmap_bulk_read(regmap, ATMEL_HLCDC_LAYER_CFG(layer, 0),
+				 upd->slots[upd->next].configs,
+				 layer->desc->nconfigs);
+
+	return 0;
+}
+
+void atmel_hlcdc_layer_update_rollback(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_update *upd = &layer->update;
+
+	atmel_hlcdc_layer_update_reset(layer);
+	mutex_unlock(&upd->lock);
+}
+
+int atmel_hlcdc_layer_update_set_gem(struct atmel_hlcdc_layer *layer,
+				     int plane_id,
+				     struct drm_gem_cma_object *gem,
+				     unsigned int offset)
+{
+	struct atmel_hlcdc_layer_update *upd = &layer->update;
+	struct atmel_hlcdc_layer_gem_flip *gem_flip;
+	struct atmel_hlcdc_layer_update_slot *slot;
+	struct atmel_hlcdc_dma_channel_dscr *dscr;
+	struct drm_gem_object *old_gem;
+
+	if (upd->next < 0 || upd->next > 1)
+		return -EINVAL;
+
+	if (plane_id >= layer->max_planes || plane_id < 0)
+		return -EINVAL;
+
+	slot = &upd->slots[upd->next];
+	dscr = slot->dscrs[plane_id];
+	dscr->addr = gem->paddr + offset;
+	dscr->ctrl = ATMEL_HLCDC_LAYER_DFETCH;
+	gem_flip = dscr->gem_flip;
+
+	old_gem = gem_flip->gems[plane_id];
+
+	if (gem) {
+		drm_gem_object_reference(&gem->base);
+		gem_flip->gems[plane_id] = &gem->base;
+		gem_flip->remaining_gems++;
+	} else {
+		gem_flip->gems[plane_id] = NULL;
+	}
+
+	if (old_gem) {
+		drm_gem_object_unreference_unlocked(old_gem);
+		gem_flip->remaining_gems--;
+	}
+
+	return 0;
+}
+
+void atmel_hlcdc_layer_update_cfg(struct atmel_hlcdc_layer *layer, int cfg,
+				  u32 mask, u32 val)
+{
+	struct atmel_hlcdc_layer_update *upd = &layer->update;
+	struct atmel_hlcdc_layer_update_slot *slot;
+
+	if (upd->next < 0 || upd->next > 1)
+		return;
+
+	if (cfg >= layer->desc->nconfigs)
+		return;
+
+	slot = &upd->slots[upd->next];
+	slot->configs[cfg] &= ~mask;
+	slot->configs[cfg] |= (val & mask);
+	set_bit(cfg, slot->updated_configs);
+}
+
+void atmel_hlcdc_layer_update_commit(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	struct atmel_hlcdc_layer_update *upd = &layer->update;
+	struct atmel_hlcdc_layer_update_slot *slot;
+	unsigned long flags;
+	int pending;
+
+	if (upd->next < 0  || upd->next > 1)
+		return;
+
+	slot = &upd->slots[upd->next];
+
+	spin_lock_irqsave(&upd->pending_lock, flags);
+	pending = upd->pending;
+	upd->pending = upd->next;
+	upd->next = pending;
+	if (pending >= 0 && !slot->gem_flip->remaining_gems) {
+		struct atmel_hlcdc_layer_gem_flip *gem_flip = slot->gem_flip;
+		struct atmel_hlcdc_dma_channel_dscr *dscrs[ATMEL_HLCDC_MAX_PLANES];
+
+		memcpy(dscrs, slot->dscrs, sizeof(dscrs));
+		slot->gem_flip = upd->slots[pending].gem_flip;
+		memcpy(slot->dscrs, upd->slots[pending].dscrs,
+		       sizeof(slot->dscrs));
+		upd->slots[pending].gem_flip = gem_flip;
+		memcpy(upd->slots[pending].dscrs, dscrs, sizeof(dscrs));
+	}
+	spin_unlock_irqrestore(&upd->pending_lock, flags);
+
+	if (pending >= 0) {
+		atmel_hlcdc_layer_update_reset(layer);
+		mutex_unlock(&upd->lock);
+		return;
+	}
+
+	spin_lock_irqsave(&dma->lock, flags);
+	if (!atmel_hlcdc_layer_dma_channel_busy(layer)) {
+		spin_lock(&upd->pending_lock);
+		atmel_hlcdc_layer_update_apply(layer);
+		spin_unlock(&upd->pending_lock);
+	}
+	spin_unlock_irqrestore(&dma->lock, flags);
+
+	atmel_hlcdc_layer_update_reset(layer);
+	mutex_unlock(&upd->lock);
+}
+
+static int atmel_hlcdc_layer_dma_init(struct drm_device *dev,
+				      struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	dma_addr_t dma_addr;
+	int i;
+
+	dma->dscrs = dma_alloc_coherent(dev->dev,
+					layer->max_planes * 4 *
+					sizeof(*dma->dscrs),
+					&dma_addr, GFP_KERNEL);
+	if (!dma->dscrs)
+		return -ENOMEM;
+
+	for (i = 0; i < layer->max_planes * 4; i++) {
+		struct atmel_hlcdc_dma_channel_dscr *dscr = &dma->dscrs[i];
+
+		dscr->next = dma_addr + (i * sizeof(*dscr));
+	}
+
+	spin_lock_init(&dma->lock);
+
+	return 0;
+}
+
+static void atmel_hlcdc_layer_dma_cleanup(struct drm_device *dev,
+					  struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	int i;
+
+	for (i = 0; i < layer->max_planes * 4; i++) {
+		struct atmel_hlcdc_dma_channel_dscr *dscr = &dma->dscrs[i];
+
+		if (!dscr->gem_flip)
+			continue;
+
+		atmel_hlcdc_layer_gem_flip_put(layer, dscr->gem_flip);
+	}
+
+	dma_free_coherent(dev->dev, layer->max_planes * 4 *
+			  sizeof(*dma->dscrs), dma->dscrs,
+			  dma->dscrs[0].next);
+}
+
+static void atmel_hlcdc_layer_gc_init(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_gem_flip_gc *gc = &layer->gc;
+
+	INIT_LIST_HEAD(&gc->list);
+	spin_lock_init(&gc->list_lock);
+	INIT_WORK(&gc->work, atmel_hlcdc_layer_gc_work);
+	mutex_init(&gc->finished_lock);
+}
+
+static void atmel_hlcdc_layer_gc_cleanup(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_gem_flip_gc *gc = &layer->gc;
+
+	flush_work(&gc->work);
+}
+
+static int atmel_hlcdc_layer_update_init(struct drm_device *dev,
+				struct atmel_hlcdc_layer *layer,
+				const struct atmel_hlcdc_layer_desc *desc)
+{
+	struct atmel_hlcdc_layer_update *upd = &layer->update;
+	int updated_size;
+	void *buffer;
+	int i;
+
+	updated_size = DIV_ROUND_UP(desc->nconfigs,
+				    BITS_PER_BYTE *
+				    sizeof(unsigned long));
+
+	buffer = devm_kzalloc(dev->dev,
+			      ((desc->nconfigs * sizeof(u32)) +
+				(updated_size * sizeof(unsigned long))) * 2,
+			      GFP_KERNEL);
+	if (!buffer)
+		return -ENOMEM;
+
+	for (i = 0; i < 2; i++) {
+		upd->slots[i].updated_configs = buffer;
+		buffer += updated_size * sizeof(unsigned long);
+		upd->slots[i].configs = buffer;
+		buffer += desc->nconfigs * sizeof(u32);
+	}
+
+	upd->pending = -1;
+	upd->next = -1;
+	spin_lock_init(&upd->pending_lock);
+	mutex_init(&upd->lock);
+
+	return 0;
+}
+
+int atmel_hlcdc_layer_init(struct drm_device *dev,
+			   struct atmel_hlcdc_layer *layer,
+			   const struct atmel_hlcdc_layer_desc *desc)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	struct regmap *regmap = dc->hlcdc->regmap;
+	unsigned int tmp;
+	int ret;
+	int i;
+
+	layer->hlcdc = dc->hlcdc;
+	layer->desc = desc;
+
+	regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_CHDR,
+		     ATMEL_HLCDC_LAYER_RST);
+	for (i = 0; i < desc->formats->nformats; i++) {
+		int nplanes = drm_format_num_planes(desc->formats->formats[i]);
+
+		if (nplanes > layer->max_planes)
+			layer->max_planes = nplanes;
+	}
+
+	atmel_hlcdc_layer_gc_init(layer);
+	ret = atmel_hlcdc_layer_dma_init(dev, layer);
+	if (ret)
+		return ret;
+
+	ret = atmel_hlcdc_layer_update_init(dev, layer, desc);
+	if (ret)
+		return ret;
+
+	/* Flush Status Register */
+	regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_IDR,
+		     0xffffffff);
+	regmap_read(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_ISR,
+		    &tmp);
+
+	for (i = 0; i < layer->max_planes; i++)
+		regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_IER,
+			     ATMEL_HLCDC_LAYER_ADD_IRQ(i) |
+			     ATMEL_HLCDC_LAYER_DONE_IRQ(i));
+
+	return 0;
+}
+
+void atmel_hlcdc_layer_cleanup(struct drm_device *dev,
+			       struct atmel_hlcdc_layer *layer)
+{
+	const struct atmel_hlcdc_layer_desc *desc = layer->desc;
+	struct regmap *regmap = layer->hlcdc->regmap;
+
+	regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_IDR,
+		     0xffffffff);
+	regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_CHDR,
+		     ATMEL_HLCDC_LAYER_RST);
+
+	atmel_hlcdc_layer_dma_cleanup(dev, layer);
+	atmel_hlcdc_layer_gc_cleanup(layer);
+}
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h
new file mode 100644
index 0000000..868f444
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.h
@@ -0,0 +1,417 @@
+/*
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DRM_ATMEL_HLCDC_LAYER_H
+#define DRM_ATMEL_HLCDC_LAYER_H
+
+#include <linux/mfd/atmel-hlcdc.h>
+
+#include <drm/drm_crtc.h>
+#include <drm/drmP.h>
+
+#define ATMEL_HLCDC_LAYER_CHER			0x0
+#define ATMEL_HLCDC_LAYER_CHDR			0x4
+#define ATMEL_HLCDC_LAYER_CHSR			0x8
+#define		ATMEL_HLCDC_LAYER_DMA_CHAN	BIT(0)
+#define		ATMEL_HLCDC_LAYER_UPDATE	BIT(1)
+#define		ATMEL_HLCDC_LAYER_A2Q		BIT(2)
+#define		ATMEL_HLCDC_LAYER_RST		BIT(8)
+
+#define ATMEL_HLCDC_LAYER_IER			0xc
+#define ATMEL_HLCDC_LAYER_IDR			0x10
+#define ATMEL_HLCDC_LAYER_IMR			0x14
+#define ATMEL_HLCDC_LAYER_ISR			0x18
+#define		ATMEL_HLCDC_LAYER_DFETCH	BIT(0)
+#define		ATMEL_HLCDC_LAYER_LFETCH	BIT(1)
+#define		ATMEL_HLCDC_LAYER_DMA_IRQ(n)	BIT(2 + ((n) * 8))
+#define		ATMEL_HLCDC_LAYER_DSCR_IRQ(n)	BIT(3 + ((n) * 8))
+#define		ATMEL_HLCDC_LAYER_ADD_IRQ(n)	BIT(4 + ((n) * 8))
+#define		ATMEL_HLCDC_LAYER_DONE_IRQ(n)	BIT(5 + ((n) * 8))
+#define		ATMEL_HLCDC_LAYER_OVR_IRQ(n)	BIT(6 + ((n) * 8))
+
+#define ATMEL_HLCDC_LAYER_PLANE_HEAD(n)		(((n) * 0x10) + 0x1c)
+#define ATMEL_HLCDC_LAYER_PLANE_ADDR(n)		(((n) * 0x10) + 0x20)
+#define ATMEL_HLCDC_LAYER_PLANE_CTRL(n)		(((n) * 0x10) + 0x24)
+#define ATMEL_HLCDC_LAYER_PLANE_NEXT(n)		(((n) * 0x10) + 0x28)
+#define ATMEL_HLCDC_LAYER_CFG(p, c)		(((c) * 4) + ((p)->max_planes * 0x10) + 0x1c)
+
+#define	ATMEL_HLCDC_LAYER_DMA_CFG_ID		0
+#define	ATMEL_HLCDC_LAYER_DMA_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, ATMEL_HLCDC_LAYER_DMA_CFG_ID)
+
+#define	ATMEL_HLCDC_LAYER_FORMAT_CFG_ID		1
+#define	ATMEL_HLCDC_LAYER_FORMAT_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, ATMEL_HLCDC_LAYER_FORMAT_CFG_ID)
+#define		ATMEL_HLCDC_LAYER_RGB		(0 << 0)
+#define		ATMEL_HLCDC_LAYER_CLUT		(1 << 0)
+#define		ATMEL_HLCDC_LAYER_YUV		(2 << 0)
+#define		ATMEL_HLCDC_RGB_MODE(m)		(((m) & 0xf) << 4)
+#define		ATMEL_HLCDC_CLUT_MODE(m)	(((m) & 0x3) << 8)
+#define		ATMEL_HLCDC_YUV_MODE(m)		(((m) & 0xf) << 12)
+#define		ATMEL_HLCDC_YUV422ROT		(1 << 16)
+#define		ATMEL_HLCDC_YUV422SWP		(1 << 17)
+#define		ATMEL_HLCDC_DSCALEOPT		(1 << 20)
+
+#define		ATMEL_HLCDC_XRGB4444_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(0))
+#define		ATMEL_HLCDC_ARGB4444_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(1))
+#define		ATMEL_HLCDC_RGBA4444_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(2))
+#define		ATMEL_HLCDC_RGB565_MODE		(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(3))
+#define		ATMEL_HLCDC_ARGB1555_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(4))
+#define		ATMEL_HLCDC_XRGB8888_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(9))
+#define		ATMEL_HLCDC_RGB888_MODE		(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(10))
+#define		ATMEL_HLCDC_ARGB8888_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(12))
+#define		ATMEL_HLCDC_RGBA8888_MODE	(ATMEL_HLCDC_LAYER_RGB | ATMEL_HLCDC_RGB_MODE(13))
+
+#define		ATMEL_HLCDC_AYUV_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(0))
+#define		ATMEL_HLCDC_YUYV_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(1))
+#define		ATMEL_HLCDC_UYVY_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(2))
+#define		ATMEL_HLCDC_YVYU_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(3))
+#define		ATMEL_HLCDC_VYUY_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(4))
+#define		ATMEL_HLCDC_NV61_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(5))
+#define		ATMEL_HLCDC_YUV422_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(6))
+#define		ATMEL_HLCDC_NV21_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(7))
+#define		ATMEL_HLCDC_YUV420_MODE		(ATMEL_HLCDC_LAYER_YUV | ATMEL_HLCDC_YUV_MODE(8))
+
+#define	ATMEL_HLCDC_LAYER_POS_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.pos)
+#define	ATMEL_HLCDC_LAYER_SIZE_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.size)
+#define	ATMEL_HLCDC_LAYER_MEMSIZE_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.memsize)
+#define	ATMEL_HLCDC_LAYER_XSTRIDE_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.xstride)
+#define	ATMEL_HLCDC_LAYER_PSTRIDE_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.pstride)
+#define ATMEL_HLCDC_LAYER_DFLTCOLOR_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.default_color)
+#define ATMEL_HLCDC_LAYER_CRKEY_CFG(p)		ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.chroma_key)
+#define ATMEL_HLCDC_LAYER_CRKEY_MASK_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.chroma_key_mask)
+
+#define	ATMEL_HLCDC_LAYER_GENERAL_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.general_config)
+#define		ATMEL_HLCDC_LAYER_CRKEY		BIT(0)
+#define		ATMEL_HLCDC_LAYER_INV		BIT(1)
+#define		ATMEL_HLCDC_LAYER_ITER2BL	BIT(2)
+#define		ATMEL_HLCDC_LAYER_ITER		BIT(3)
+#define		ATMEL_HLCDC_LAYER_REVALPHA	BIT(4)
+#define		ATMEL_HLCDC_LAYER_GAEN		BIT(5)
+#define		ATMEL_HLCDC_LAYER_LAEN		BIT(6)
+#define		ATMEL_HLCDC_LAYER_OVR		BIT(7)
+#define		ATMEL_HLCDC_LAYER_DMA		BIT(8)
+#define		ATMEL_HLCDC_LAYER_REP		BIT(9)
+#define		ATMEL_HLCDC_LAYER_DSTKEY	BIT(10)
+#define		ATMEL_HLCDC_LAYER_GA_MASK	GENMASK(23, 16)
+#define		ATMEL_HLCDC_LAYER_GA_SHIFT	16
+
+#define ATMEL_HLCDC_LAYER_DISC_POS_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.disc_pos)
+
+#define ATMEL_HLCDC_LAYER_DISC_SIZE_CFG(p)	ATMEL_HLCDC_LAYER_CFG(p, (p)->desc->layout.disc_size)
+
+#define ATMEL_HLCDC_MAX_PLANES			3
+
+/**
+ * Atmel HLCDC Layer registers layout structure
+ *
+ * Each HLCDC layer has its own register organization and a given register
+ * by be placed differently on 2 different layers depending on its
+ * capabilities.
+ * This structure stores common registers layout for a given layer and is
+ * used by HLCDC layer code to chose the appropriate register to write to
+ * or to read from.
+ *
+ * For all fields, a value of zero means "unsupported".
+ *
+ * See Atmel's datasheet for a detailled description of these registers.
+ *
+ * @xstride: xstride registers
+ * @pstride: pstride registers
+ * @pos: position register
+ * @size: displayed size register
+ * @memsize: memory size register
+ * @default_color: default color register
+ * @chroma_key: chroma key register
+ * @chroma_key_mask: chroma key mask register
+ * @general_config: general layer config register
+ * @disc_pos: discard area position register
+ * @disc_size: discard area size register
+ * @color_space_conv: color spave conversion register
+ */
+struct atmel_hlcdc_layer_cfg_layout {
+	int xstride[ATMEL_HLCDC_MAX_PLANES];
+	int pstride[ATMEL_HLCDC_MAX_PLANES];
+	int pos;
+	int size;
+	int memsize;
+	int default_color;
+	int chroma_key;
+	int chroma_key_mask;
+	int general_config;
+	int disc_pos;
+	int disc_size;
+	int color_space_conv;
+};
+
+/**
+ * Atmel HLCDC GEM flip structure
+ *
+ * This structure is allocated when someone asked for a layer update (most
+ * likely a DRM plane update, either primary, overlay or cursor plane) and
+ * released when the layer do not need the reference GEM objects anymore
+ * (i.e. the layer was disabled or updated).
+ *
+ * @node: list element structure. Used to attach the GEM flip structure to
+ *	  the garbage collector when the layer no longer need the referenced
+ *	  GEM objects.
+ * @gems: the referenced GEM objects. The number of GEM object referenced
+ *	  depends on the chosen format.
+ * @remaining_gems: the number of GEM object still referenced by the layer.
+ *		    When no more objects are referenced the GEM flip structure
+ *		    is added to the garbage collector.
+ */
+struct atmel_hlcdc_layer_gem_flip {
+	struct list_head node;
+	struct drm_gem_object *gems[ATMEL_HLCDC_MAX_PLANES];
+	int remaining_gems;
+};
+
+/**
+ * Atmel HLCDC DMA descriptor structure
+ *
+ * This structure is used by the HLCDC DMA engine to schedule a DMA transfer.
+ *
+ * The structure fields must remain in this specific order, because they're
+ * used by the HLCDC DMA engine, which expect them in this order.
+ *
+ * @addr: buffer DMA address
+ * @ctrl: DMA transfer options
+ * @next: next DMA descriptor to fetch
+ * @gem_flip: the attached gem_flip operation
+ */
+struct atmel_hlcdc_dma_channel_dscr {
+	dma_addr_t addr;
+	u32 ctrl;
+	dma_addr_t next;
+	struct atmel_hlcdc_layer_gem_flip *gem_flip;
+} __aligned(sizeof(u64));
+
+/**
+ * Atmel HLCDC layer types
+ */
+enum atmel_hlcdc_layer_type {
+	ATMEL_HLCDC_BASE_LAYER,
+	ATMEL_HLCDC_OVERLAY_LAYER,
+	ATMEL_HLCDC_CURSOR_LAYER,
+	ATMEL_HLCDC_PP_LAYER,
+};
+
+/**
+ * Atmel HLCDC Supported formats structure
+ *
+ * This structure list all the formats supported by a given layer.
+ *
+ * @nformats: number of supported formats
+ * @formats: supported formats
+ */
+struct atmel_hlcdc_formats {
+	int nformats;
+	uint32_t *formats;
+};
+
+/**
+ * Atmel HLCDC Layer description structure
+ *
+ * This structure describe the capabilities provided by a given layer.
+ *
+ * @name: layer name
+ * @type: layer type
+ * @id: layer id
+ * @regs_offset: offset of the layer registers from the HLCDC registers base
+ * @nconfigs: number of config registers provided by this layer
+ * @layout: config registers layout
+ * @max_width: maximum width supported by this layer (0 means unlimited)
+ * @max_height: maximum height supported by this layer (0 means unlimited)
+ */
+struct atmel_hlcdc_layer_desc {
+	const char *name;
+	enum atmel_hlcdc_layer_type type;
+	int id;
+	int regs_offset;
+	int nconfigs;
+	struct atmel_hlcdc_formats *formats;
+	struct atmel_hlcdc_layer_cfg_layout layout;
+	int max_width;
+	int max_height;
+};
+
+/**
+ * Atmel HLCDC Layer Update Slot structure
+ *
+ * This structure stores layer update requests to be applied on next frame.
+ * This is the base structure behind the atomic layer update infrastructure.
+ *
+ * Atomic layer update provides a way to update all layer's parameters
+ * simultaneously. This is needed to avoid incompatible sequential updates
+ * like this one:
+ * 1) update layer format from RGB888 (1 plane/buffer) to YUV422
+ *    (2 planes/buffers)
+ * 2) the format update is applied but the DMA channel for the second
+ *    plane/buffer is not enabled
+ * 3) enable the DMA channel for the second plane
+ *
+ *@dscrs: DMA channel descriptors
+ *@gem_flip: gem_flip object
+ *@updated_configs: bitmask used to record modified configs
+ *@configs: new config values
+ */
+struct atmel_hlcdc_layer_update_slot {
+	struct atmel_hlcdc_dma_channel_dscr *dscrs[ATMEL_HLCDC_MAX_PLANES];
+	struct atmel_hlcdc_layer_gem_flip *gem_flip;
+	unsigned long *updated_configs;
+	u32 *configs;
+};
+
+/**
+ * Atmel HLCDC Layer Update structure
+ *
+ * This structure provides a way to queue layer update requests.
+ *
+ * At a given time there is at most:
+ *  - one pending update request, which means the update request has been
+ *    commited (or validated) and is waiting for the DMA channel(s) to be
+ *    available
+ *  - one request being prepared, which means someone started a layer update
+ *    but has not commited it yet. There cannot be more than one started
+ *    request, because the update lock is taken when starting a layer update
+ *    and release when commiting or rolling back the request.
+ *
+ *@slots: update slots. One is used for pending request and the other one
+ *	  for started update request
+ *@pending: the pending slot index or -1 if no request is pending
+ *@next: the started update slot index or -1 no update has been started
+ *@pending_lock: lock to access the pending field
+ *@lock: layer update lock
+ */
+struct atmel_hlcdc_layer_update {
+	struct atmel_hlcdc_layer_update_slot slots[2];
+	int pending;
+	int next;
+	spinlock_t pending_lock;
+	struct mutex lock;
+};
+
+/**
+ * Atmel HLCDC Layer GEM flip garbage collector structure
+ *
+ * This structure is used to schedule GEM object release when we are in
+ * interrupt context (within atmel_hlcdc_layer_irq function).
+ *
+ *@list: GEM flip objects to release
+ *@list_lock: lock to access the GEM flip list
+ *@work: work queue scheduled when there are GEM flip to collect
+ *@finished: action to execute the GEM flip and all attached objects have been
+ *	     released
+ *@finished_data: data passed to the finished callback
+ *@finished_lock: lock to access finished related fields
+ */
+struct atmel_hlcdc_layer_gem_flip_gc {
+	struct list_head list;
+	spinlock_t list_lock;
+	struct work_struct work;
+	void (*finished)(void *data);
+	void *finished_data;
+	struct mutex finished_lock;
+};
+
+/**
+ * Atmel HLCDC Layer DMA channel structure
+ *
+ * This structure stores informations on the DMA channel associated to a
+ * given layer.
+ *
+ *@enabled: DMA channel status
+ *@lock: lock to access the DMA channel fields
+ *@cur: current DMA transfers (one for each plane/buffer)
+ *@queue: next DMA transfers, to be launch on next frame update
+ *@dscrs: allocated DMA descriptors
+ */
+struct atmel_hlcdc_layer_dma_channel {
+	bool enabled;
+	spinlock_t lock;
+	struct atmel_hlcdc_dma_channel_dscr *cur[ATMEL_HLCDC_MAX_PLANES];
+	struct atmel_hlcdc_dma_channel_dscr *queue[ATMEL_HLCDC_MAX_PLANES];
+	struct atmel_hlcdc_dma_channel_dscr *dscrs;
+};
+
+/**
+ * Atmel HLCDC Layer structure
+ *
+ * This structure stores information on the layer instance.
+ *
+ *@desc: layer description
+ *@max_planes: maximum planes/buffers that can be associated with this layer.
+ *	       This depends on the supported formats.
+ *@hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
+ *@dma: dma channel
+ *@gc: GEM flip garbage collector
+ *@update: update handler
+ */
+struct atmel_hlcdc_layer {
+	const struct atmel_hlcdc_layer_desc *desc;
+	int max_planes;
+	struct atmel_hlcdc *hlcdc;
+	struct atmel_hlcdc_layer_dma_channel dma;
+	struct atmel_hlcdc_layer_gem_flip_gc gc;
+	struct atmel_hlcdc_layer_update update;
+};
+
+void atmel_hlcdc_layer_irq(struct atmel_hlcdc_layer *layer);
+
+int atmel_hlcdc_layer_init(struct drm_device *dev,
+			   struct atmel_hlcdc_layer *layer,
+			   const struct atmel_hlcdc_layer_desc *desc);
+
+void atmel_hlcdc_layer_cleanup(struct drm_device *dev,
+			       struct atmel_hlcdc_layer *layer);
+
+int atmel_hlcdc_layer_disable(struct atmel_hlcdc_layer *layer);
+
+void atmel_hlcdc_layer_set_finished(struct atmel_hlcdc_layer *layer,
+				    void (*finished)(void *data),
+				    void *data);
+
+int atmel_hlcdc_layer_update_start(struct atmel_hlcdc_layer *layer);
+
+void atmel_hlcdc_layer_update_cfg(struct atmel_hlcdc_layer *layer, int cfg,
+				  u32 mask, u32 val);
+
+int atmel_hlcdc_layer_update_set_gem(struct atmel_hlcdc_layer *layer,
+				     int plane_id,
+				     struct drm_gem_cma_object *gem,
+				     unsigned int offset);
+
+void atmel_hlcdc_layer_update_rollback(struct atmel_hlcdc_layer *layer);
+
+void atmel_hlcdc_layer_update_commit(struct atmel_hlcdc_layer *layer);
+
+static inline bool
+atmel_hlcdc_layer_dma_channel_busy(struct atmel_hlcdc_layer *layer)
+{
+	struct atmel_hlcdc_layer_dma_channel *dma = &layer->dma;
+	int i;
+
+	for (i = 0; i < layer->max_planes; i++) {
+		if (dma->queue[i])
+			return true;
+	}
+
+	return false;
+}
+
+#endif /* DRM_ATMEL_HLCDC_LAYER_H */
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c
new file mode 100644
index 0000000..3295021
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_panel.c
@@ -0,0 +1,351 @@
+/*
+ * Copyright (C) 2014 Traphandler
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_panel.h>
+
+#include "atmel_hlcdc_dc.h"
+
+/**
+ * Atmel HLCDC RGB output mode
+ */
+enum atmel_hlcdc_connector_rgb_mode {
+	ATMEL_HLCDC_CONNECTOR_RGB444,
+	ATMEL_HLCDC_CONNECTOR_RGB565,
+	ATMEL_HLCDC_CONNECTOR_RGB666,
+	ATMEL_HLCDC_CONNECTOR_RGB888,
+};
+
+/**
+ * Atmel HLCDC Panel structure
+ *
+ * This structure stores informations about an DRM panel connected through
+ * the RGB connector.
+ *
+ * @mode: RGB output mode
+ * @connector: DRM connector
+ * @encoder: DRM encoder
+ * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
+ * @panel: pointer to the attached DRM panel
+ * @pinctrl: pinctrl state used by the current RGB output mode
+ * @np: DRM panel DT node
+ * @dpms: current DPMS mode
+ */
+struct atmel_hlcdc_panel {
+	enum atmel_hlcdc_connector_rgb_mode mode;
+	struct drm_connector connector;
+	struct drm_encoder encoder;
+	struct atmel_hlcdc *hlcdc;
+	struct drm_panel *panel;
+	struct pinctrl *pinctrl;
+	struct device_node *np;
+	int dpms;
+};
+
+static const char * const pin_state_names[] = {
+	[ATMEL_HLCDC_CONNECTOR_RGB444] = "rgb-444",
+	[ATMEL_HLCDC_CONNECTOR_RGB565] = "rgb-565",
+	[ATMEL_HLCDC_CONNECTOR_RGB666] = "rgb-666",
+	[ATMEL_HLCDC_CONNECTOR_RGB888] = "rgb-888",
+};
+
+static inline struct atmel_hlcdc_panel *
+drm_connector_to_atmel_hlcdc_panel(struct drm_connector *connector)
+{
+	return container_of(connector, struct atmel_hlcdc_panel, connector);
+}
+
+static inline struct atmel_hlcdc_panel *
+drm_encoder_to_atmel_hlcdc_panel(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct atmel_hlcdc_panel, encoder);
+}
+
+static void atmel_hlcdc_panel_encoder_dpms(struct drm_encoder *encoder,
+					   int mode)
+{
+	struct atmel_hlcdc_panel *panel =
+			drm_encoder_to_atmel_hlcdc_panel(encoder);
+	struct regmap *regmap = panel->hlcdc->regmap;
+	unsigned int status;
+
+	if (mode != DRM_MODE_DPMS_ON)
+		mode = DRM_MODE_DPMS_OFF;
+
+	if (mode == panel->dpms)
+		return;
+
+	if (mode != DRM_MODE_DPMS_ON) {
+		regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
+		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+		       (status & ATMEL_HLCDC_DISP))
+			cpu_relax();
+
+		regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC);
+		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+		       (status & ATMEL_HLCDC_SYNC))
+			cpu_relax();
+
+		regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK);
+		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+		       (status & ATMEL_HLCDC_PIXEL_CLK))
+			cpu_relax();
+
+		clk_disable_unprepare(panel->hlcdc->sys_clk);
+		if (panel->panel)
+			drm_panel_disable(panel->panel);
+	} else {
+		if (panel->panel)
+			drm_panel_enable(panel->panel);
+		clk_prepare_enable(panel->hlcdc->sys_clk);
+
+		regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);
+		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+		       !(status & ATMEL_HLCDC_PIXEL_CLK))
+			cpu_relax();
+
+
+		regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC);
+		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+		       !(status & ATMEL_HLCDC_SYNC))
+			cpu_relax();
+
+		regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP);
+		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
+		       !(status & ATMEL_HLCDC_DISP))
+			cpu_relax();
+	}
+
+	panel->dpms = mode;
+}
+
+static bool
+atmel_hlcdc_panel_encoder_mode_fixup(struct drm_encoder *encoder,
+				     const struct drm_display_mode *mode,
+				     struct drm_display_mode *adjusted)
+{
+	return true;
+}
+
+static void atmel_hlcdc_panel_encoder_prepare(struct drm_encoder *encoder)
+{
+	atmel_hlcdc_panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
+}
+
+static void atmel_hlcdc_panel_encoder_commit(struct drm_encoder *encoder)
+{
+	atmel_hlcdc_panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
+}
+
+static void
+atmel_hlcdc_panel_encoder_mode_set(struct drm_encoder *encoder,
+				   struct drm_display_mode *mode,
+				   struct drm_display_mode *adjusted)
+{
+	struct atmel_hlcdc_panel *panel =
+			drm_encoder_to_atmel_hlcdc_panel(encoder);
+	unsigned long prate = clk_get_rate(panel->hlcdc->sys_clk);
+	unsigned long mode_rate = mode->clock * 1000;
+	int div;
+	u32 cfg0 = 0;
+
+	if ((prate / 2) < mode_rate) {
+		prate *= 2;
+		cfg0 |= ATMEL_HLCDC_CLKSEL;
+	}
+
+	div = DIV_ROUND_UP(prate, mode_rate);
+	if (div < 2)
+		div = 2;
+
+	cfg0 |= ATMEL_HLCDC_CLKDIV(div);
+
+	regmap_update_bits(panel->hlcdc->regmap, ATMEL_HLCDC_CFG(0),
+			   ATMEL_HLCDC_CLKSEL | ATMEL_HLCDC_CLKDIV_MASK, cfg0);
+}
+
+static struct drm_encoder_helper_funcs encoder_helper_funcs = {
+	.dpms = atmel_hlcdc_panel_encoder_dpms,
+	.mode_fixup = atmel_hlcdc_panel_encoder_mode_fixup,
+	.prepare = atmel_hlcdc_panel_encoder_prepare,
+	.commit = atmel_hlcdc_panel_encoder_commit,
+	.mode_set = atmel_hlcdc_panel_encoder_mode_set,
+};
+
+static void atmel_hlcdc_panel_encoder_destroy(struct drm_encoder *encoder)
+{
+	drm_encoder_cleanup(encoder);
+	memset(encoder, 0, sizeof(*encoder));
+}
+
+static const struct drm_encoder_funcs encoder_funcs = {
+	.destroy = atmel_hlcdc_panel_encoder_destroy,
+};
+
+static int atmel_hlcdc_panel_get_modes(struct drm_connector *connector)
+{
+	struct atmel_hlcdc_panel *panel =
+			drm_connector_to_atmel_hlcdc_panel(connector);
+	int ret;
+
+	if (!panel->panel)
+		return -ENOENT;
+
+	ret = panel->panel->funcs->get_modes(panel->panel);
+	return ret;
+}
+
+static int atmel_hlcdc_panel_mode_valid(struct drm_connector *connector,
+					struct drm_display_mode *mode)
+{
+	return MODE_OK;
+}
+
+static struct drm_encoder *
+atmel_hlcdc_panel_best_encoder(struct drm_connector *connector)
+{
+	struct atmel_hlcdc_panel *panel =
+			drm_connector_to_atmel_hlcdc_panel(connector);
+
+	return &panel->encoder;
+}
+
+static struct drm_connector_helper_funcs connector_helper_funcs = {
+	.get_modes = atmel_hlcdc_panel_get_modes,
+	.mode_valid = atmel_hlcdc_panel_mode_valid,
+	.best_encoder = atmel_hlcdc_panel_best_encoder,
+};
+
+static enum drm_connector_status
+atmel_hlcdc_panel_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct atmel_hlcdc_panel *panel =
+			drm_connector_to_atmel_hlcdc_panel(connector);
+
+	if (!panel->panel) {
+		panel->panel = of_drm_find_panel(panel->np);
+		if (panel->panel)
+			drm_panel_attach(panel->panel, &panel->connector);
+	}
+
+	if (panel->panel)
+		return connector_status_connected;
+
+	return connector_status_disconnected;
+}
+
+static void
+atmel_hlcdc_panel_connector_destroy(struct drm_connector *connector)
+{
+	struct atmel_hlcdc_panel *panel =
+			drm_connector_to_atmel_hlcdc_panel(connector);
+
+	if (panel->panel)
+		drm_panel_detach(panel->panel);
+
+	drm_sysfs_connector_remove(connector);
+	drm_connector_cleanup(connector);
+
+	pinctrl_put(panel->pinctrl);
+}
+
+static const struct drm_connector_funcs connector_funcs = {
+	.dpms = drm_helper_connector_dpms,
+	.detect = atmel_hlcdc_panel_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = atmel_hlcdc_panel_connector_destroy,
+};
+
+int atmel_hlcdc_panel_create(struct drm_device *dev)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	struct atmel_hlcdc_panel *panel;
+	struct of_phandle_args out_args;
+	u32 cfg;
+	int ret;
+
+	panel = devm_kzalloc(dev->dev, sizeof(*panel), GFP_KERNEL);
+	if (!panel)
+		return -ENOMEM;
+
+	ret = of_parse_phandle_with_fixed_args(dev->dev->of_node,
+					       "atmel,panel", 2, 0,
+					       &out_args);
+	if (ret) {
+		dev_err(dev->dev, "failed to retrieve panel info from DT\n");
+		return ret;
+	}
+
+	switch (out_args.args[0]) {
+	case ATMEL_HLCDC_CONNECTOR_RGB444:
+	case ATMEL_HLCDC_CONNECTOR_RGB565:
+	case ATMEL_HLCDC_CONNECTOR_RGB666:
+	case ATMEL_HLCDC_CONNECTOR_RGB888:
+		break;
+	default:
+		dev_err(dev->dev, "unknown RGB mode\n");
+		return -EINVAL;
+	}
+
+	panel->np = out_args.np;
+	panel->mode = out_args.args[0];
+	panel->pinctrl = pinctrl_get_select(dev->dev,
+					    pin_state_names[panel->mode]);
+	if (IS_ERR(panel->pinctrl)) {
+		dev_err(dev->dev, "could not request pinctrl state\n");
+		return PTR_ERR(panel->pinctrl);
+	}
+
+	cfg = out_args.args[1] & (ATMEL_HLCDC_HSPOL |
+				  ATMEL_HLCDC_VSPOL |
+				  ATMEL_HLCDC_VSPDLYS |
+				  ATMEL_HLCDC_VSPDLYE |
+				  ATMEL_HLCDC_DISPPOL |
+				  ATMEL_HLCDC_DISPDLY |
+				  ATMEL_HLCDC_VSPSU |
+				  ATMEL_HLCDC_VSPHO);
+	cfg |= panel->mode << 8;
+
+	regmap_write(dc->hlcdc->regmap,
+		     ATMEL_HLCDC_CFG(5),
+		     cfg);
+
+	panel->dpms = DRM_MODE_DPMS_OFF;
+
+	panel->hlcdc = dc->hlcdc;
+
+	drm_connector_init(dev, &panel->connector, &connector_funcs,
+			   DRM_MODE_CONNECTOR_LVDS);
+	drm_connector_helper_add(&panel->connector, &connector_helper_funcs);
+	panel->connector.dpms = DRM_MODE_DPMS_OFF;
+	panel->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
+
+	drm_encoder_init(dev, &panel->encoder, &encoder_funcs,
+			 DRM_MODE_ENCODER_LVDS);
+	drm_encoder_helper_add(&panel->encoder, &encoder_helper_funcs);
+
+	drm_mode_connector_attach_encoder(&panel->connector, &panel->encoder);
+	drm_sysfs_connector_add(&panel->connector);
+
+	panel->encoder.possible_crtcs = 0x1;
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
new file mode 100644
index 0000000..f428b47
--- /dev/null
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
@@ -0,0 +1,658 @@
+/*
+ * Copyright (C) 2014 Free Electrons
+ * Copyright (C) 2014 Atmel
+ *
+ * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "atmel_hlcdc_dc.h"
+
+#define SUBPIXEL_MASK			0xffff
+
+static uint32_t rgb_formats[] = {
+	DRM_FORMAT_XRGB4444,
+	DRM_FORMAT_ARGB4444,
+	DRM_FORMAT_RGBA4444,
+	DRM_FORMAT_ARGB1555,
+	DRM_FORMAT_RGB888,
+	DRM_FORMAT_ARGB1555,
+	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_ARGB8888,
+	DRM_FORMAT_RGBA8888,
+};
+
+struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_formats = {
+	.formats = rgb_formats,
+	.nformats = ARRAY_SIZE(rgb_formats),
+};
+
+static uint32_t rgb_and_yuv_formats[] = {
+	DRM_FORMAT_XRGB4444,
+	DRM_FORMAT_ARGB4444,
+	DRM_FORMAT_RGBA4444,
+	DRM_FORMAT_ARGB1555,
+	DRM_FORMAT_RGB888,
+	DRM_FORMAT_ARGB1555,
+	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_ARGB8888,
+	DRM_FORMAT_RGBA8888,
+	DRM_FORMAT_AYUV,
+	DRM_FORMAT_YUYV,
+	DRM_FORMAT_UYVY,
+	DRM_FORMAT_YVYU,
+	DRM_FORMAT_VYUY,
+	DRM_FORMAT_NV61,
+	DRM_FORMAT_YUV422,
+	DRM_FORMAT_NV21,
+};
+
+struct atmel_hlcdc_formats atmel_hlcdc_plane_rgb_and_yuv_formats = {
+	.formats = rgb_and_yuv_formats,
+	.nformats = ARRAY_SIZE(rgb_and_yuv_formats),
+};
+
+static int atmel_hlcdc_format_to_plane_mode(u32 format, u32 *mode)
+{
+	switch (format) {
+	case DRM_FORMAT_XRGB4444:
+		*mode = ATMEL_HLCDC_XRGB4444_MODE;
+		break;
+	case DRM_FORMAT_ARGB4444:
+		*mode = ATMEL_HLCDC_ARGB4444_MODE;
+		break;
+	case DRM_FORMAT_RGBA4444:
+		*mode = ATMEL_HLCDC_RGBA4444_MODE;
+		break;
+	case DRM_FORMAT_RGB565:
+		*mode = ATMEL_HLCDC_RGB565_MODE;
+		break;
+	case DRM_FORMAT_RGB888:
+		*mode = ATMEL_HLCDC_RGB888_MODE;
+		break;
+	case DRM_FORMAT_ARGB1555:
+		*mode = ATMEL_HLCDC_ARGB1555_MODE;
+		break;
+	case DRM_FORMAT_XRGB8888:
+		*mode = ATMEL_HLCDC_XRGB8888_MODE;
+		break;
+	case DRM_FORMAT_ARGB8888:
+		*mode = ATMEL_HLCDC_ARGB8888_MODE;
+		break;
+	case DRM_FORMAT_RGBA8888:
+		*mode = ATMEL_HLCDC_RGBA8888_MODE;
+		break;
+	case DRM_FORMAT_AYUV:
+		*mode = ATMEL_HLCDC_AYUV_MODE;
+		break;
+	case DRM_FORMAT_YUYV:
+		*mode = ATMEL_HLCDC_YUYV_MODE;
+		break;
+	case DRM_FORMAT_UYVY:
+		*mode = ATMEL_HLCDC_UYVY_MODE;
+		break;
+	case DRM_FORMAT_YVYU:
+		*mode = ATMEL_HLCDC_YVYU_MODE;
+		break;
+	case DRM_FORMAT_VYUY:
+		*mode = ATMEL_HLCDC_VYUY_MODE;
+		break;
+	case DRM_FORMAT_NV61:
+		*mode = ATMEL_HLCDC_NV61_MODE;
+		break;
+	case DRM_FORMAT_YUV422:
+		*mode = ATMEL_HLCDC_YUV422_MODE;
+		break;
+	case DRM_FORMAT_NV21:
+		*mode = ATMEL_HLCDC_NV21_MODE;
+		break;
+	case DRM_FORMAT_YUV420:
+		*mode = ATMEL_HLCDC_YUV420_MODE;
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	return 0;
+}
+
+static bool atmel_hlcdc_format_embedds_alpha(u32 format)
+{
+	int i;
+
+	for (i = 0; i < sizeof(format); i++) {
+		char tmp = (format >> (8 * i)) & 0xff;
+
+		if (tmp == 'A')
+			return true;
+	}
+
+	return false;
+}
+
+static u32 heo_downscaling_xcoef[] = {
+	0x11343311,
+	0x000000f7,
+	0x1635300c,
+	0x000000f9,
+	0x1b362c08,
+	0x000000fb,
+	0x1f372804,
+	0x000000fe,
+	0x24382400,
+	0x00000000,
+	0x28371ffe,
+	0x00000004,
+	0x2c361bfb,
+	0x00000008,
+	0x303516f9,
+	0x0000000c,
+};
+
+static u32 heo_downscaling_ycoef[] = {
+	0x00123737,
+	0x00173732,
+	0x001b382d,
+	0x001f3928,
+	0x00243824,
+	0x0028391f,
+	0x002d381b,
+	0x00323717,
+};
+
+static u32 heo_upscaling_xcoef[] = {
+	0xf74949f7,
+	0x00000000,
+	0xf55f33fb,
+	0x000000fe,
+	0xf5701efe,
+	0x000000ff,
+	0xf87c0dff,
+	0x00000000,
+	0x00800000,
+	0x00000000,
+	0x0d7cf800,
+	0x000000ff,
+	0x1e70f5ff,
+	0x000000fe,
+	0x335ff5fe,
+	0x000000fb,
+};
+
+static u32 heo_upscaling_ycoef[] = {
+	0x00004040,
+	0x00075920,
+	0x00056f0c,
+	0x00027b03,
+	0x00008000,
+	0x00037b02,
+	0x000c6f05,
+	0x00205907,
+};
+
+int atmel_hlcdc_plane_update_pos_and_size(struct atmel_hlcdc_plane *plane,
+					  struct drm_crtc *crtc,
+					  int crtc_x, int crtc_y,
+					  unsigned int crtc_w,
+					  unsigned int crtc_h,
+					  uint32_t src_x, uint32_t src_y,
+					  uint32_t src_w, uint32_t src_h)
+{
+	const struct atmel_hlcdc_layer_cfg_layout *layout =
+						&plane->layer.desc->layout;
+
+	if (!crtc_h || !crtc_w)
+		return -EINVAL;
+
+	if (!layout->pos && (crtc_x || crtc_y))
+		return -EINVAL;
+
+	if ((crtc_x + crtc_w) > crtc->mode.crtc_hdisplay ||
+	    (crtc_y + crtc_h) > crtc->mode.crtc_vdisplay)
+		return -EINVAL;
+
+	if (!layout->size &&
+	    (crtc->mode.crtc_hdisplay != crtc_w ||
+	     crtc->mode.crtc_vdisplay != crtc_h))
+		return -EINVAL;
+
+	if (plane->layer.desc->max_height &&
+	    crtc_h > plane->layer.desc->max_height)
+		return -EINVAL;
+
+	if (plane->layer.desc->max_width &&
+	    crtc_w > plane->layer.desc->max_width)
+		return -EINVAL;
+
+	if (!layout->memsize && (crtc_h != src_h || crtc_w != src_w))
+		return -EINVAL;
+
+	if (layout->size)
+		atmel_hlcdc_layer_update_cfg(&plane->layer,
+					     layout->size,
+					     0xffffffff,
+					     (crtc_w - 1) |
+					     ((crtc_h - 1) << 16));
+
+	if (layout->memsize)
+		atmel_hlcdc_layer_update_cfg(&plane->layer,
+					     layout->memsize,
+					     0xffffffff,
+					     (src_w - 1) |
+					     ((src_h - 1) << 16));
+
+	if (layout->pos)
+		atmel_hlcdc_layer_update_cfg(&plane->layer,
+					     layout->pos,
+					     0xffffffff,
+					     crtc_x | (crtc_y  << 16));
+
+	/* TODO: rework the rescaling part */
+	if (crtc_w != src_w || crtc_h != src_h) {
+		u32 factor_reg = 0;
+
+		if (crtc_w != src_w) {
+			int i;
+			u32 factor;
+			u32 *coeff_tab = heo_upscaling_xcoef;
+			u32 max_memsize;
+
+			if (crtc_w < src_w)
+				coeff_tab = heo_downscaling_xcoef;
+			for (i = 0; i < ARRAY_SIZE(heo_upscaling_xcoef); i++)
+				atmel_hlcdc_layer_update_cfg(&plane->layer,
+							     17 + i,
+							     0xffffffff,
+							     coeff_tab[i]);
+			factor = ((8 * 256 * src_w) - (256 * 4)) / crtc_w;
+			factor++;
+			max_memsize = ((factor * crtc_w) + (256 * 4)) / 2048;
+			if (max_memsize > src_w)
+				factor--;
+			factor_reg |= factor | 0x80000000;
+		}
+
+		if (crtc_h != src_h) {
+			int i;
+			u32 factor;
+			u32 *coeff_tab = heo_upscaling_ycoef;
+			u32 max_memsize;
+
+			if (crtc_w < src_w)
+				coeff_tab = heo_downscaling_ycoef;
+			for (i = 0; i < ARRAY_SIZE(heo_upscaling_ycoef); i++)
+				atmel_hlcdc_layer_update_cfg(&plane->layer,
+							     33 + i,
+							     0xffffffff,
+							     coeff_tab[i]);
+			factor = ((8 * 256 * src_w) - (256 * 4)) / crtc_w;
+			factor++;
+			max_memsize = ((factor * crtc_w) + (256 * 4)) / 2048;
+			if (max_memsize > src_w)
+				factor--;
+			factor_reg |= (factor << 16) | 0x80000000;
+		}
+
+		atmel_hlcdc_layer_update_cfg(&plane->layer, 13, 0xffffffff,
+					     factor_reg);
+	}
+
+	return 0;
+}
+
+void atmel_hlcdc_plane_update_general_settings(struct atmel_hlcdc_plane *plane,
+					       u32 format)
+{
+	const struct atmel_hlcdc_layer_cfg_layout *layout =
+						&plane->layer.desc->layout;
+	unsigned int cfg = ATMEL_HLCDC_LAYER_DMA;
+
+	if (plane->base.type != DRM_PLANE_TYPE_PRIMARY) {
+		cfg |= ATMEL_HLCDC_LAYER_OVR | ATMEL_HLCDC_LAYER_ITER2BL |
+		       ATMEL_HLCDC_LAYER_ITER;
+
+		if (atmel_hlcdc_format_embedds_alpha(format))
+			cfg |= ATMEL_HLCDC_LAYER_LAEN;
+		else
+			cfg |= (plane->alpha << ATMEL_HLCDC_LAYER_GA_SHIFT) |
+			       ATMEL_HLCDC_LAYER_GAEN;
+	}
+
+	atmel_hlcdc_layer_update_cfg(&plane->layer, layout->general_config,
+				     ATMEL_HLCDC_LAYER_ITER2BL |
+				     ATMEL_HLCDC_LAYER_ITER |
+				     ATMEL_HLCDC_LAYER_GAEN |
+				     ATMEL_HLCDC_LAYER_LAEN |
+				     ATMEL_HLCDC_LAYER_OVR |
+				     ATMEL_HLCDC_LAYER_DMA |
+				     ATMEL_HLCDC_LAYER_GA_MASK, cfg);
+}
+
+int atmel_hlcdc_plane_update_format(struct atmel_hlcdc_plane *plane,
+				    u32 format)
+{
+	u32 mode;
+	int ret;
+
+	ret = atmel_hlcdc_format_to_plane_mode(format, &mode);
+	if (ret)
+		return ret;
+
+	atmel_hlcdc_layer_update_cfg(&plane->layer,
+				     ATMEL_HLCDC_LAYER_FORMAT_CFG_ID,
+				     0xffffffff,
+				     mode);
+
+	return 0;
+}
+
+int atmel_hlcdc_plane_update_buffers(struct atmel_hlcdc_plane *plane,
+				     u32 pixel_format,
+				     struct drm_gem_cma_object **gems,
+				     unsigned int *pitches,
+				     unsigned int *offsets,
+				     uint32_t src_x, uint32_t src_y,
+				     uint32_t src_w, uint32_t src_h)
+{
+	struct atmel_hlcdc_layer *layer = &plane->layer;
+	const struct atmel_hlcdc_layer_cfg_layout *layout =
+							&layer->desc->layout;
+	int bpp[ATMEL_HLCDC_MAX_PLANES];
+	int nplanes;
+	int ret = 0;
+	int i;
+
+	nplanes = drm_format_num_planes(pixel_format);
+
+	for (i = 0; i < nplanes; i++) {
+		bpp[i] = drm_format_plane_cpp(pixel_format, i);
+		if (!bpp[i])
+			return -EINVAL;
+
+		if (!gems[i])
+			return -EINVAL;
+	}
+
+	for (i = 0; i < nplanes; i++) {
+		int offset;
+
+		offset = offsets[i] + (src_y * pitches[i]) +
+			 (src_x * bpp[i]);
+
+		ret = atmel_hlcdc_layer_update_set_gem(&plane->layer, i,
+						       gems[i], offset);
+		if (ret)
+			return ret;
+
+		if (layout->xstride[i])
+			atmel_hlcdc_layer_update_cfg(&plane->layer,
+						layout->xstride[i],
+						0xffffffff,
+						pitches[i] - (bpp[i] * src_w));
+	}
+
+	return 0;
+}
+
+static int atmel_hlcdc_plane_update(struct drm_plane *p,
+				    struct drm_crtc *crtc,
+				    struct drm_framebuffer *fb,
+				    int crtc_x, int crtc_y,
+				    unsigned int crtc_w, unsigned int crtc_h,
+				    uint32_t src_x, uint32_t src_y,
+				    uint32_t src_w, uint32_t src_h)
+{
+	struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
+	struct drm_gem_cma_object *gems[ATMEL_HLCDC_MAX_PLANES];
+	int nplanes;
+	int ret = 0;
+	int i;
+
+	/* Subpixel positioning is not supported */
+	if ((src_x | src_y | src_w | src_h) & SUBPIXEL_MASK) {
+		DRM_DEBUG_KMS("Primary base does not support subpixel positioning\n");
+		return -EINVAL;
+	}
+
+	src_h >>= 16;
+	src_w >>= 16;
+	src_x >>= 16;
+	src_y >>= 16;
+
+	nplanes = drm_format_num_planes(fb->pixel_format);
+	if (nplanes > ATMEL_HLCDC_MAX_PLANES)
+		return -EINVAL;
+
+	for (i = 0; i < nplanes; i++)
+		gems[i] = drm_fb_cma_get_gem_obj(fb, i);
+
+	atmel_hlcdc_layer_update_start(&plane->layer);
+	ret = atmel_hlcdc_plane_update_pos_and_size(plane, crtc,
+						    crtc_x, crtc_y,
+						    crtc_w, crtc_h,
+						    src_x, src_y,
+						    src_w, src_h);
+	if (ret)
+		goto out;
+
+	atmel_hlcdc_plane_update_general_settings(plane, fb->pixel_format);
+
+	ret = atmel_hlcdc_plane_update_format(plane, fb->pixel_format);
+	if (ret)
+		goto out;
+
+
+	ret = atmel_hlcdc_plane_update_buffers(plane, fb->pixel_format,
+					       gems,
+					       fb->pitches, fb->offsets,
+					       src_x, src_y,
+					       src_w, src_h);
+
+	if (ret)
+		goto out;
+
+	atmel_hlcdc_layer_update_commit(&plane->layer);
+
+	drm_framebuffer_reference(fb);
+	if (plane->base.fb)
+		drm_framebuffer_unreference(plane->base.fb);
+	plane->base.fb = fb;
+
+	return 0;
+
+out:
+	atmel_hlcdc_layer_update_rollback(&plane->layer);
+
+	return ret;
+}
+
+static int atmel_hlcdc_plane_disable(struct drm_plane *p)
+{
+	struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
+
+	return atmel_hlcdc_layer_disable(&plane->layer);
+}
+
+static void atmel_hlcdc_plane_destroy(struct drm_plane *p)
+{
+	struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
+
+	if (plane->base.fb)
+		drm_framebuffer_unreference(plane->base.fb);
+
+	atmel_hlcdc_layer_cleanup(p->dev, &plane->layer);
+
+	drm_plane_cleanup(p);
+	devm_kfree(p->dev->dev, plane);
+}
+
+static int atmel_hlcdc_plane_set_alpha(struct atmel_hlcdc_plane *plane,
+				       u8 alpha)
+{
+	atmel_hlcdc_layer_update_start(&plane->layer);
+	plane->alpha = alpha;
+	atmel_hlcdc_plane_update_general_settings(plane,
+						plane->base.fb->pixel_format);
+	atmel_hlcdc_layer_update_commit(&plane->layer);
+
+	return 0;
+}
+
+static int atmel_hlcdc_plane_set_property(struct drm_plane *p,
+					  struct drm_property *property,
+					  uint64_t value)
+{
+	struct atmel_hlcdc_plane *plane = drm_plane_to_atmel_hlcdc_plane(p);
+	struct atmel_hlcdc_plane_properties *props = plane->properties;
+
+	if (property == props->alpha)
+		atmel_hlcdc_plane_set_alpha(plane, value);
+	else
+		return -EINVAL;
+
+	return 0;
+}
+
+static struct drm_plane_funcs layer_plane_funcs = {
+	.update_plane = atmel_hlcdc_plane_update,
+	.disable_plane = atmel_hlcdc_plane_disable,
+	.set_property = atmel_hlcdc_plane_set_property,
+	.destroy = atmel_hlcdc_plane_destroy,
+};
+
+static struct atmel_hlcdc_plane *
+atmel_hlcdc_plane_create(struct drm_device *dev,
+			 const struct atmel_hlcdc_layer_desc *desc)
+{
+	struct atmel_hlcdc_plane *plane;
+	enum drm_plane_type type;
+	int ret;
+
+	plane = devm_kzalloc(dev->dev, sizeof(*plane), GFP_KERNEL);
+	if (!plane)
+		return ERR_PTR(-ENOMEM);
+
+	ret = atmel_hlcdc_layer_init(dev, &plane->layer, desc);
+	if (ret)
+		return ERR_PTR(ret);
+
+	/* Set default property values*/
+	plane->alpha = 0xff;
+
+	if (desc->type == ATMEL_HLCDC_BASE_LAYER)
+		type = DRM_PLANE_TYPE_PRIMARY;
+	else if (desc->type == ATMEL_HLCDC_CURSOR_LAYER)
+		type = DRM_PLANE_TYPE_CURSOR;
+	else
+		type = DRM_PLANE_TYPE_OVERLAY;
+
+	ret = drm_universal_plane_init(dev, &plane->base, 0,
+				       &layer_plane_funcs,
+				       desc->formats->formats,
+				       desc->formats->nformats, type);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return plane;
+}
+
+static struct atmel_hlcdc_plane_properties *
+atmel_hlcdc_plane_create_properties(struct drm_device *dev)
+{
+	struct atmel_hlcdc_plane_properties *props;
+
+	props = devm_kzalloc(dev->dev, sizeof(*props), GFP_KERNEL);
+	if (!props)
+		return ERR_PTR(-ENOMEM);
+
+	props->alpha = drm_property_create_range(dev, 0, "alpha", 0, 255);
+	if (!props->alpha)
+		return ERR_PTR(-ENOMEM);
+
+	return props;
+}
+
+struct atmel_hlcdc_planes *
+atmel_hlcdc_create_planes(struct drm_device *dev)
+{
+	struct atmel_hlcdc_dc *dc = dev->dev_private;
+	struct atmel_hlcdc_plane_properties *props;
+	struct atmel_hlcdc_planes *planes;
+	const struct atmel_hlcdc_layer_desc *descs = dc->desc->layers;
+	int nlayers = dc->desc->nlayers;
+	int i;
+
+	planes = devm_kzalloc(dev->dev, sizeof(*planes), GFP_KERNEL);
+	if (!planes)
+		return ERR_PTR(-ENOMEM);
+
+	for (i = 0; i < nlayers; i++) {
+		if (descs[i].type == ATMEL_HLCDC_OVERLAY_LAYER)
+			planes->noverlays++;
+	}
+
+	if (planes->noverlays) {
+		planes->overlays = devm_kzalloc(dev->dev,
+						planes->noverlays *
+						sizeof(*planes->overlays),
+						GFP_KERNEL);
+		if (!planes->overlays)
+			return ERR_PTR(-ENOMEM);
+	}
+
+	props = atmel_hlcdc_plane_create_properties(dev);
+	if (IS_ERR(props))
+		return ERR_CAST(props);
+
+	planes->noverlays = 0;
+	for (i = 0; i < nlayers; i++) {
+		struct atmel_hlcdc_plane *plane;
+
+		if (descs[i].type == ATMEL_HLCDC_PP_LAYER)
+			continue;
+
+		plane = atmel_hlcdc_plane_create(dev, &descs[i]);
+		if (IS_ERR(plane))
+			return ERR_CAST(plane);
+
+		plane->properties = props;
+
+		switch (descs[i].type) {
+		case ATMEL_HLCDC_BASE_LAYER:
+			if (planes->primary)
+				return ERR_PTR(-EINVAL);
+			planes->primary = plane;
+			break;
+
+		case ATMEL_HLCDC_OVERLAY_LAYER:
+			planes->overlays[planes->noverlays++] = plane;
+			drm_object_attach_property(&plane->base.base,
+						   props->alpha, 255);
+			break;
+
+		case ATMEL_HLCDC_CURSOR_LAYER:
+			if (planes->cursor)
+				return ERR_PTR(-EINVAL);
+			planes->cursor = plane;
+			drm_object_attach_property(&plane->base.base,
+						   props->alpha, 255);
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	return planes;
+}
diff --git a/drivers/gpu/drm/atmel_hlcdc/Kconfig b/drivers/gpu/drm/atmel_hlcdc/Kconfig
new file mode 100644
index 0000000..59c8eeb
--- /dev/null
+++ b/drivers/gpu/drm/atmel_hlcdc/Kconfig
@@ -0,0 +1,11 @@
+config DRM_ATMEL_HLCDC
+	tristate "DRM Support for ATMEL HLCDC Display Controller"
+	depends on DRM && OF && ARM && COMMON_CLK
+	select DRM_GEM_CMA_HELPER
+	select DRM_KMS_HELPER
+	select DRM_KMS_FB_HELPER
+	select DRM_KMS_CMA_HELPER
+	select DRM_PANEL
+	help
+	  Choose this option if you have an ATMEL SoC with an HLCDC display
+	  controller (i.e. at91sam9n12, at91sam9x5 family or sama5d3 family).
diff --git a/drivers/gpu/drm/atmel_hlcdc/Makefile b/drivers/gpu/drm/atmel_hlcdc/Makefile
new file mode 100644
index 0000000..08de8d7
--- /dev/null
+++ b/drivers/gpu/drm/atmel_hlcdc/Makefile
@@ -0,0 +1,8 @@
+atmel_hlcdc-y := atmel_hlcdc_crtc.o \
+		atmel_hlcdc_drv.o \
+		atmel_hlcdc_layer.o \
+		atmel_hlcdc_panel.o \
+		atmel_hlcdc_plane.o \
+		atmel_hlcdc_pwm.o
+
+obj-$(CONFIG_DRM_ATMEL_HLCDC)	+= atmel_hlcdc.o