Message-Id: <1457710959-9562-2-git-send-email-abrodkin@synopsys.com>
Date:	Fri, 11 Mar 2016 18:42:36 +0300
From:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-snps-arc@...ts.infradead.org,
	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org,
	Jose Abreu <Jose.Abreu@...opsys.com>
Subject: [PATCH 1/4 v3] drm: Add support of ARC PGU display controller

ARC PGU could be found on some development boards from Synopsys.
This is a simple byte streamer that reads data from a framebuffer
and sends data to the single encoder.

Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
Cc: David Airlie <airlied@...ux.ie>
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-snps-arc@...ts.infradead.org
Cc: Jose Abreu <joabreu@...opsys.com>
---

Changes v2 -> v3:
 * Improved failure path if arcpgu_connector wasn't allocated (thanks Jose).
 * Fixed driver building as module (reported by 0-DAY kernel test infrastruct.)
 * Implemented uncached mapping of user-space FB pages.

No changes v1 -> v2.

 drivers/gpu/drm/Kconfig            |   2 +
 drivers/gpu/drm/Makefile           |   1 +
 drivers/gpu/drm/arc/Kconfig        |  10 ++
 drivers/gpu/drm/arc/Makefile       |   2 +
 drivers/gpu/drm/arc/arcpgu.h       |  50 +++++++
 drivers/gpu/drm/arc/arcpgu_crtc.c  | 274 +++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/arc/arcpgu_drv.c   | 252 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/arc/arcpgu_fbdev.c | 245 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/arc/arcpgu_hdmi.c  | 207 ++++++++++++++++++++++++++++
 drivers/gpu/drm/arc/arcpgu_regs.h  |  36 +++++
 10 files changed, 1079 insertions(+)
 create mode 100644 drivers/gpu/drm/arc/Kconfig
 create mode 100644 drivers/gpu/drm/arc/Makefile
 create mode 100644 drivers/gpu/drm/arc/arcpgu.h
 create mode 100644 drivers/gpu/drm/arc/arcpgu_crtc.c
 create mode 100644 drivers/gpu/drm/arc/arcpgu_drv.c
 create mode 100644 drivers/gpu/drm/arc/arcpgu_fbdev.c
 create mode 100644 drivers/gpu/drm/arc/arcpgu_hdmi.c
 create mode 100644 drivers/gpu/drm/arc/arcpgu_regs.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index f2a74d0..9e4f2f1 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -281,3 +281,5 @@ source "drivers/gpu/drm/imx/Kconfig"
 source "drivers/gpu/drm/vc4/Kconfig"
 
 source "drivers/gpu/drm/etnaviv/Kconfig"
+
+source "drivers/gpu/drm/arc/Kconfig"
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 6eb94fc..c338d04 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -78,3 +78,4 @@ obj-y			+= panel/
 obj-y			+= bridge/
 obj-$(CONFIG_DRM_FSL_DCU) += fsl-dcu/
 obj-$(CONFIG_DRM_ETNAVIV) += etnaviv/
+obj-$(CONFIG_DRM_ARCPGU)+= arc/
diff --git a/drivers/gpu/drm/arc/Kconfig b/drivers/gpu/drm/arc/Kconfig
new file mode 100644
index 0000000..f9a13b6
--- /dev/null
+++ b/drivers/gpu/drm/arc/Kconfig
@@ -0,0 +1,10 @@
+config DRM_ARCPGU
+	tristate "ARC PGU"
+	depends on DRM && OF
+	select DRM_KMS_CMA_HELPER
+	select DRM_KMS_FB_HELPER
+	select DRM_KMS_HELPER
+	help
+	  Choose this option if you have an ARC PGU controller.
+
+	  If M is selected the module will be called arcpgu.
diff --git a/drivers/gpu/drm/arc/Makefile b/drivers/gpu/drm/arc/Makefile
new file mode 100644
index 0000000..736ee6f
--- /dev/null
+++ b/drivers/gpu/drm/arc/Makefile
@@ -0,0 +1,2 @@
+arcpgu-y := arcpgu_crtc.o arcpgu_hdmi.o arcpgu_fbdev.o arcpgu_drv.o
+obj-$(CONFIG_DRM_ARCPGU) += arcpgu.o
diff --git a/drivers/gpu/drm/arc/arcpgu.h b/drivers/gpu/drm/arc/arcpgu.h
new file mode 100644
index 0000000..86574b6
--- /dev/null
+++ b/drivers/gpu/drm/arc/arcpgu.h
@@ -0,0 +1,50 @@
+/*
+ * ARC PGU DRM driver.
+ *
+ * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.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.
+ *
+ */
+
+#ifndef _ARCPGU_H_
+#define _ARCPGU_H_
+
+struct arcpgu_drm_private {
+	void __iomem		*regs;
+	struct clk		*clk;
+	struct drm_fbdev_cma	*fbdev;
+	struct drm_framebuffer	*fb;
+	struct list_head	event_list;
+	struct drm_crtc		crtc;
+	struct drm_plane	*plane;
+};
+
+#define crtc_to_arcpgu_priv(x) container_of(x, struct arcpgu_drm_private, crtc)
+
+static inline void arc_pgu_write(struct arcpgu_drm_private *arcpgu,
+				 unsigned int reg, u32 value)
+{
+	iowrite32(value, arcpgu->regs + reg);
+}
+
+static inline u32 arc_pgu_read(struct arcpgu_drm_private *arcpgu,
+			       unsigned int reg)
+{
+	return ioread32(arcpgu->regs + reg);
+}
+
+int arc_pgu_setup_crtc(struct drm_device *dev);
+int arcpgu_drm_hdmi_init(struct drm_device *drm, struct device_node *np);
+struct drm_fbdev_cma *arcpgu_fbdev_cma_init(struct drm_device *dev,
+	unsigned int preferred_bpp, unsigned int num_crtc,
+	unsigned int max_conn_count);
+
+#endif
diff --git a/drivers/gpu/drm/arc/arcpgu_crtc.c b/drivers/gpu/drm/arc/arcpgu_crtc.c
new file mode 100644
index 0000000..0fe5c8a
--- /dev/null
+++ b/drivers/gpu/drm/arc/arcpgu_crtc.c
@@ -0,0 +1,274 @@
+/*
+ * ARC PGU DRM driver.
+ *
+ * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_plane_helper.h>
+#include <linux/clk.h>
+#include <linux/platform_data/simplefb.h>
+
+#include "arcpgu.h"
+#include "arcpgu_regs.h"
+
+#define ENCODE_PGU_XY(x, y)	((((x) - 1) << 16) | ((y) - 1))
+
+static struct simplefb_format supported_formats[] = {
+	{ "r5g6b5", 16, {11, 5}, {5, 6}, {0, 5}, {0, 0}, DRM_FORMAT_RGB565 },
+	{ "r8g8b8", 24, {16, 8}, {8, 8}, {0, 8}, {0, 0}, DRM_FORMAT_RGB888 },
+};
+
+static void arc_pgu_set_pxl_fmt(struct drm_crtc *crtc)
+{
+	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
+	uint32_t pixel_format = crtc->primary->state->fb->pixel_format;
+	struct simplefb_format *format = NULL;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(supported_formats); i++) {
+		if (supported_formats[i].fourcc == pixel_format)
+			format = &supported_formats[i];
+	}
+
+	if (WARN_ON(!format))
+		return;
+
+	if (format->fourcc == DRM_FORMAT_RGB888)
+		arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
+			      arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) |
+					   ARCPGU_MODE_RGB888_MASK);
+
+}
+
+static const struct drm_crtc_funcs arc_pgu_crtc_funcs = {
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.reset = drm_atomic_helper_crtc_reset,
+	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+};
+
+static void arc_pgu_crtc_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
+	struct drm_display_mode *m = &crtc->state->adjusted_mode;
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_FMT,
+		      ENCODE_PGU_XY(m->crtc_htotal, m->crtc_vtotal));
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_HSYNC,
+		      ENCODE_PGU_XY(m->crtc_hsync_start - m->crtc_hdisplay,
+				    m->crtc_hsync_end - m->crtc_hdisplay));
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_VSYNC,
+		      ENCODE_PGU_XY(m->crtc_vsync_start - m->crtc_vdisplay,
+				    m->crtc_vsync_end - m->crtc_vdisplay));
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_ACTIVE,
+		      ENCODE_PGU_XY(m->crtc_hblank_end - m->crtc_hblank_start,
+				    m->crtc_vblank_end - m->crtc_vblank_start));
+
+	arc_pgu_write(arcpgu, ARCPGU_REG_STRIDE, 0);
+	arc_pgu_write(arcpgu, ARCPGU_REG_START_SET, 1);
+
+	arc_pgu_set_pxl_fmt(crtc);
+
+	clk_set_rate(arcpgu->clk, m->crtc_clock * 1000);
+}
+
+static void arc_pgu_crtc_enable(struct drm_crtc *crtc)
+{
+	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
+
+	clk_prepare_enable(arcpgu->clk);
+	arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
+		      arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) |
+		      ARCPGU_CTRL_ENABLE_MASK);
+}
+
+static void arc_pgu_crtc_disable(struct drm_crtc *crtc)
+{
+	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
+
+	if (!crtc->primary->fb)
+		return;
+
+	clk_disable_unprepare(arcpgu->clk);
+	arc_pgu_write(arcpgu, ARCPGU_REG_CTRL,
+			      arc_pgu_read(arcpgu, ARCPGU_REG_CTRL) &
+			      ~ARCPGU_CTRL_ENABLE_MASK);
+}
+
+static int arc_pgu_crtc_atomic_check(struct drm_crtc *crtc,
+				     struct drm_crtc_state *state)
+{
+	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
+	struct drm_display_mode *mode = &state->adjusted_mode;
+	long rate, clk_rate = mode->clock * 1000;
+
+	rate = clk_round_rate(arcpgu->clk, clk_rate);
+	if (rate != clk_rate)
+		return -EINVAL;
+
+	return 0;
+}
+
+static void arc_pgu_crtc_atomic_begin(struct drm_crtc *crtc,
+				      struct drm_crtc_state *state)
+{
+	struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
+	unsigned long flags;
+
+	if (crtc->state->event) {
+		struct drm_pending_vblank_event *event = crtc->state->event;
+
+		crtc->state->event = NULL;
+		event->pipe = drm_crtc_index(crtc);
+
+		WARN_ON(drm_crtc_vblank_get(crtc) != 0);
+
+		spin_lock_irqsave(&crtc->dev->event_lock, flags);
+		list_add_tail(&event->base.link, &arcpgu->event_list);
+		spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
+	}
+}
+
+static void arc_pgu_crtc_atomic_flush(struct drm_crtc *crtc,
+				      struct drm_crtc_state *state)
+{
+}
+
+static bool arc_pgu_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 arc_pgu_crtc_helper_funcs = {
+	.mode_fixup	= arc_pgu_crtc_mode_fixup,
+	.mode_set	= drm_helper_crtc_mode_set,
+	.mode_set_base	= drm_helper_crtc_mode_set_base,
+	.mode_set_nofb	= arc_pgu_crtc_mode_set_nofb,
+	.enable		= arc_pgu_crtc_enable,
+	.disable	= arc_pgu_crtc_disable,
+	.prepare	= arc_pgu_crtc_disable,
+	.commit		= arc_pgu_crtc_enable,
+	.atomic_check	= arc_pgu_crtc_atomic_check,
+	.atomic_begin	= arc_pgu_crtc_atomic_begin,
+	.atomic_flush	= arc_pgu_crtc_atomic_flush,
+};
+
+static int arc_pgu_plane_atomic_check(struct drm_plane *plane,
+				      struct drm_plane_state *state)
+{
+	return 0;
+}
+
+static void arc_pgu_plane_atomic_update(struct drm_plane *plane,
+					struct drm_plane_state *state)
+{
+	struct arcpgu_drm_private *arcpgu;
+	struct drm_gem_cma_object *gem;
+
+	if (!plane->state->crtc || !plane->state->fb)
+		return;
+
+	arcpgu = crtc_to_arcpgu_priv(plane->state->crtc);
+	gem = drm_fb_cma_get_gem_obj(plane->state->fb, 0);
+	arc_pgu_write(arcpgu, ARCPGU_REG_BUF0_ADDR, gem->paddr);
+}
+
+static const struct drm_plane_helper_funcs arc_pgu_plane_helper_funcs = {
+	.prepare_fb = NULL,
+	.cleanup_fb = NULL,
+	.atomic_check = arc_pgu_plane_atomic_check,
+	.atomic_update = arc_pgu_plane_atomic_update,
+};
+
+static void arc_pgu_plane_destroy(struct drm_plane *plane)
+{
+	drm_plane_helper_disable(plane);
+	drm_plane_cleanup(plane);
+}
+
+static const struct drm_plane_funcs arc_pgu_plane_funcs = {
+	.update_plane		= drm_atomic_helper_update_plane,
+	.disable_plane		= drm_atomic_helper_disable_plane,
+	.destroy		= arc_pgu_plane_destroy,
+	.reset			= drm_atomic_helper_plane_reset,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state	= drm_atomic_helper_plane_destroy_state,
+};
+
+static struct drm_plane *arc_pgu_plane_init(struct drm_device *drm)
+{
+	struct arcpgu_drm_private *arcpgu = drm->dev_private;
+	struct drm_plane *plane = NULL;
+	u32 formats[ARRAY_SIZE(supported_formats)], i;
+	int ret;
+
+	plane = devm_kzalloc(drm->dev, sizeof(*plane), GFP_KERNEL);
+	if (!plane)
+		return ERR_PTR(-ENOMEM);
+
+	for (i = 0; i < ARRAY_SIZE(supported_formats); i++)
+		formats[i] = supported_formats[i].fourcc;
+
+	ret = drm_universal_plane_init(drm, plane, 0xff, &arc_pgu_plane_funcs,
+				       formats, ARRAY_SIZE(formats),
+				       DRM_PLANE_TYPE_PRIMARY, NULL);
+	if (ret)
+		return ERR_PTR(ret);
+
+	drm_plane_helper_add(plane, &arc_pgu_plane_helper_funcs);
+	arcpgu->plane = plane;
+
+	return plane;
+}
+
+void arc_pgu_crtc_suspend(struct drm_crtc *crtc)
+{
+	arc_pgu_crtc_disable(crtc);
+}
+
+void arc_pgu_crtc_resume(struct drm_crtc *crtc)
+{
+	arc_pgu_crtc_enable(crtc);
+}
+
+int arc_pgu_setup_crtc(struct drm_device *drm)
+{
+	struct arcpgu_drm_private *arcpgu = drm->dev_private;
+	struct drm_plane *primary;
+	int ret;
+
+	primary = arc_pgu_plane_init(drm);
+	if (IS_ERR(primary))
+		return PTR_ERR(primary);
+
+	ret = drm_crtc_init_with_planes(drm, &arcpgu->crtc, primary, NULL,
+					&arc_pgu_crtc_funcs, NULL);
+	if (ret) {
+		arc_pgu_plane_destroy(primary);
+		return ret;
+	}
+
+	drm_crtc_helper_add(&arcpgu->crtc, &arc_pgu_crtc_helper_funcs);
+	return 0;
+}
diff --git a/drivers/gpu/drm/arc/arcpgu_drv.c b/drivers/gpu/drm/arc/arcpgu_drv.c
new file mode 100644
index 0000000..d47481d
--- /dev/null
+++ b/drivers/gpu/drm/arc/arcpgu_drv.c
@@ -0,0 +1,252 @@
+/*
+ * ARC PGU DRM driver.
+ *
+ * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/clk.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_atomic_helper.h>
+
+#include "arcpgu.h"
+#include "arcpgu_regs.h"
+
+static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
+{
+	struct arcpgu_drm_private *arcpgu = dev->dev_private;
+
+	if (arcpgu->fbdev)
+		drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
+}
+
+static int arcpgu_atomic_commit(struct drm_device *dev,
+				    struct drm_atomic_state *state, bool async)
+{
+	return drm_atomic_helper_commit(dev, state, false);
+}
+
+static struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
+	.fb_create  = drm_fb_cma_create,
+	.output_poll_changed = arcpgu_fb_output_poll_changed,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = arcpgu_atomic_commit,
+};
+
+static void arcpgu_setup_mode_config(struct drm_device *drm)
+{
+	drm_mode_config_init(drm);
+	drm->mode_config.min_width = 0;
+	drm->mode_config.min_height = 0;
+	drm->mode_config.max_width = 1920;
+	drm->mode_config.max_height = 1080;
+	drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
+}
+
+int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	int ret;
+
+	ret = drm_gem_mmap(filp, vma);
+	if (ret)
+		return ret;
+
+	vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+	return 0;
+}
+
+static const struct file_operations arcpgu_drm_ops = {
+	.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 = arcpgu_gem_mmap,
+};
+
+static void arcpgu_preclose(struct drm_device *drm, struct drm_file *file)
+{
+	struct arcpgu_drm_private *arcpgu = drm->dev_private;
+	struct drm_pending_vblank_event *e, *t;
+	unsigned long flags;
+
+	spin_lock_irqsave(&drm->event_lock, flags);
+	list_for_each_entry_safe(e, t, &arcpgu->event_list, base.link) {
+		if (e->base.file_priv != file)
+			continue;
+		list_del(&e->base.link);
+		e->base.destroy(&e->base);
+	}
+	spin_unlock_irqrestore(&drm->event_lock, flags);
+}
+
+static void arcpgu_lastclose(struct drm_device *drm)
+{
+	struct arcpgu_drm_private *arcpgu = drm->dev_private;
+
+	drm_fbdev_cma_restore_mode(arcpgu->fbdev);
+}
+
+static int arcpgu_load(struct drm_device *drm, unsigned long flags)
+{
+	struct platform_device *pdev = drm->platformdev;
+	struct arcpgu_drm_private *arcpgu;
+	struct device_node *encoder_node;
+	struct resource *res;
+	int ret;
+
+	arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
+	if (arcpgu == NULL)
+		return -ENOMEM;
+
+	drm->dev_private = arcpgu;
+
+	arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
+	if (IS_ERR(arcpgu->clk))
+		return PTR_ERR(arcpgu->clk);
+
+	INIT_LIST_HEAD(&arcpgu->event_list);
+
+	arcpgu_setup_mode_config(drm);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(arcpgu->regs)) {
+		dev_err(drm->dev, "Could not remap IO mem\n");
+		return PTR_ERR(arcpgu->regs);
+	}
+
+	dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
+		 arc_pgu_read(arcpgu, ARCPGU_REG_ID));
+
+	if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
+		return -ENODEV;
+
+	if (arc_pgu_setup_crtc(drm) < 0)
+		return -ENODEV;
+
+	/* find the encoder node and initialize it */
+	encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
+	if (!encoder_node) {
+		dev_err(drm->dev, "failed to get an encoder slave node\n");
+		return -ENODEV;
+	}
+
+	ret = arcpgu_drm_hdmi_init(drm, encoder_node);
+	if (ret < 0)
+		return ret;
+
+	drm_mode_config_reset(drm);
+	drm_kms_helper_poll_init(drm);
+
+	arcpgu->fbdev = arcpgu_fbdev_cma_init(drm, 16,
+					      drm->mode_config.num_crtc,
+					      drm->mode_config.num_connector);
+	if (IS_ERR(arcpgu->fbdev)) {
+		ret = PTR_ERR(arcpgu->fbdev);
+		arcpgu->fbdev = NULL;
+		return -ENODEV;
+	}
+
+	platform_set_drvdata(pdev, arcpgu);
+	return 0;
+}
+
+int arcpgu_unload(struct drm_device *drm)
+{
+	struct arcpgu_drm_private *arcpgu = drm->dev_private;
+
+	if (arcpgu->fbdev) {
+		drm_fbdev_cma_fini(arcpgu->fbdev);
+		arcpgu->fbdev = NULL;
+	}
+	drm_kms_helper_poll_fini(drm);
+	drm_vblank_cleanup(drm);
+	drm_mode_config_cleanup(drm);
+
+	return 0;
+}
+
+static struct drm_driver arcpgu_drm_driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
+			   DRIVER_ATOMIC,
+	.preclose = arcpgu_preclose,
+	.lastclose = arcpgu_lastclose,
+	.name = "drm-arcpgu",
+	.desc = "ARC PGU Controller",
+	.date = "20160219",
+	.major = 1,
+	.minor = 0,
+	.patchlevel = 0,
+	.fops = &arcpgu_drm_ops,
+	.load = arcpgu_load,
+	.unload = arcpgu_unload,
+	.dumb_create = drm_gem_cma_dumb_create,
+	.dumb_map_offset = drm_gem_cma_dumb_map_offset,
+	.dumb_destroy = drm_gem_dumb_destroy,
+	.get_vblank_counter = drm_vblank_no_hw_counter,
+	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+	.gem_free_object = drm_gem_cma_free_object,
+	.gem_vm_ops = &drm_gem_cma_vm_ops,
+	.gem_prime_export = drm_gem_prime_export,
+	.gem_prime_import = drm_gem_prime_import,
+	.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
+	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+	.gem_prime_vmap = drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap = drm_gem_cma_prime_mmap,
+};
+
+static int arcpgu_probe(struct platform_device *pdev)
+{
+	return drm_platform_init(&arcpgu_drm_driver, pdev);
+}
+
+static int arcpgu_remove(struct platform_device *pdev)
+{
+	struct drm_device *drm = dev_get_drvdata(&pdev->dev);
+
+	drm_put_dev(drm);
+
+	return 0;
+}
+
+static const struct of_device_id arcpgu_of_table[] = {
+	{.compatible = "snps,arcpgu"},
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, arcpgu_of_table);
+
+static struct platform_driver arcpgu_platform_driver = {
+	.probe = arcpgu_probe,
+	.remove = arcpgu_remove,
+	.driver = {
+		   .name = "arcpgu",
+		   .owner = THIS_MODULE,
+		   .of_match_table = arcpgu_of_table,
+		   },
+};
+
+module_platform_driver(arcpgu_platform_driver);
+
+MODULE_AUTHOR("Carlos Palminha <palminha@...opsys.com");
+MODULE_DESCRIPTION("ARC PGU DRM driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/arc/arcpgu_fbdev.c b/drivers/gpu/drm/arc/arcpgu_fbdev.c
new file mode 100644
index 0000000..6f67706
--- /dev/null
+++ b/drivers/gpu/drm/arc/arcpgu_fbdev.c
@@ -0,0 +1,245 @@
+/*
+ * ARC PGU DRM driver.
+ *
+ * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+struct drm_fb_cma {
+	struct drm_framebuffer		fb;
+	struct drm_gem_cma_object	*obj[4];
+};
+
+struct drm_fbdev_cma {
+	struct drm_fb_helper	fb_helper;
+	struct drm_fb_cma	*fb;
+};
+
+static inline struct drm_fbdev_cma *to_fbdev_cma(struct drm_fb_helper *helper)
+{
+	return container_of(helper, struct drm_fbdev_cma, fb_helper);
+}
+
+static inline struct drm_fb_cma *to_fb_cma(struct drm_framebuffer *fb)
+{
+	return container_of(fb, struct drm_fb_cma, fb);
+}
+
+static void drm_fb_cma_destroy(struct drm_framebuffer *fb)
+{
+	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
+	int i;
+
+	for (i = 0; i < 4; i++) {
+		if (fb_cma->obj[i])
+			drm_gem_object_unreference_unlocked(&fb_cma->obj[i]->base);
+	}
+
+	drm_framebuffer_cleanup(fb);
+	kfree(fb_cma);
+}
+
+static int drm_fb_cma_create_handle(struct drm_framebuffer *fb,
+	struct drm_file *file_priv, unsigned int *handle)
+{
+	struct drm_fb_cma *fb_cma = to_fb_cma(fb);
+
+	return drm_gem_handle_create(file_priv,
+			&fb_cma->obj[0]->base, handle);
+}
+
+static struct drm_framebuffer_funcs drm_fb_cma_funcs = {
+	.destroy	= drm_fb_cma_destroy,
+	.create_handle	= drm_fb_cma_create_handle,
+};
+
+static struct drm_fb_cma *drm_fb_cma_alloc(struct drm_device *dev,
+	const struct drm_mode_fb_cmd2 *mode_cmd,
+	struct drm_gem_cma_object **obj,
+	unsigned int num_planes)
+{
+	struct drm_fb_cma *fb_cma;
+	int ret;
+	int i;
+
+	fb_cma = kzalloc(sizeof(*fb_cma), GFP_KERNEL);
+	if (!fb_cma)
+		return ERR_PTR(-ENOMEM);
+
+	drm_helper_mode_fill_fb_struct(&fb_cma->fb, mode_cmd);
+
+	for (i = 0; i < num_planes; i++)
+		fb_cma->obj[i] = obj[i];
+
+	ret = drm_framebuffer_init(dev, &fb_cma->fb, &drm_fb_cma_funcs);
+	if (ret) {
+		dev_err(dev->dev, "Failed to initialize framebuffer: %d\n", ret);
+		kfree(fb_cma);
+		return ERR_PTR(ret);
+	}
+
+	return fb_cma;
+}
+
+/*
+ * This function is the only reason to have a copy of drm_fbdev_cma_init()
+ * here in this driver.
+ *
+ * In its turn this mmap() is required to mark user-space page as non-cached
+ * because it is just a mirror or real hardware frame-buffer.
+ */
+static int arcpgu_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+	return vm_iomap_memory(vma, info->fix.smem_start, info->fix.smem_len);
+}
+
+static struct fb_ops drm_fbdev_cma_ops = {
+	.owner		= THIS_MODULE,
+	.fb_mmap	= arcpgu_mmap,
+	.fb_fillrect	= drm_fb_helper_sys_fillrect,
+	.fb_copyarea	= drm_fb_helper_sys_copyarea,
+	.fb_imageblit	= drm_fb_helper_sys_imageblit,
+	.fb_check_var	= drm_fb_helper_check_var,
+	.fb_set_par	= drm_fb_helper_set_par,
+	.fb_blank	= drm_fb_helper_blank,
+	.fb_pan_display	= drm_fb_helper_pan_display,
+	.fb_setcmap	= drm_fb_helper_setcmap,
+};
+
+static int drm_fbdev_cma_create(struct drm_fb_helper *helper,
+	struct drm_fb_helper_surface_size *sizes)
+{
+	struct drm_fbdev_cma *fbdev_cma = to_fbdev_cma(helper);
+	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
+	struct drm_device *dev = helper->dev;
+	struct drm_gem_cma_object *obj;
+	struct drm_framebuffer *fb;
+	unsigned int bytes_per_pixel;
+	unsigned long offset;
+	struct fb_info *fbi;
+	size_t size;
+	int ret;
+
+	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d)\n",
+			sizes->surface_width, sizes->surface_height,
+			sizes->surface_bpp);
+
+	bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
+
+	mode_cmd.width = sizes->surface_width;
+	mode_cmd.height = sizes->surface_height;
+	mode_cmd.pitches[0] = sizes->surface_width * bytes_per_pixel;
+	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
+		sizes->surface_depth);
+
+	size = mode_cmd.pitches[0] * mode_cmd.height;
+	obj = drm_gem_cma_create(dev, size);
+	if (IS_ERR(obj))
+		return -ENOMEM;
+
+	fbi = drm_fb_helper_alloc_fbi(helper);
+	if (IS_ERR(fbi)) {
+		ret = PTR_ERR(fbi);
+		goto err_gem_free_object;
+	}
+
+	fbdev_cma->fb = drm_fb_cma_alloc(dev, &mode_cmd, &obj, 1);
+	if (IS_ERR(fbdev_cma->fb)) {
+		dev_err(dev->dev, "Failed to allocate DRM framebuffer.\n");
+		ret = PTR_ERR(fbdev_cma->fb);
+		goto err_fb_info_destroy;
+	}
+
+	fb = &fbdev_cma->fb->fb;
+	helper->fb = fb;
+
+	fbi->par = helper;
+	fbi->flags = FBINFO_FLAG_DEFAULT;
+	fbi->fbops = &drm_fbdev_cma_ops;
+
+	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
+	drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
+
+	offset = fbi->var.xoffset * bytes_per_pixel;
+	offset += fbi->var.yoffset * fb->pitches[0];
+
+	dev->mode_config.fb_base = (resource_size_t)obj->paddr;
+	fbi->screen_base = obj->vaddr + offset;
+	fbi->fix.smem_start = (unsigned long)(obj->paddr + offset);
+	fbi->screen_size = size;
+	fbi->fix.smem_len = size;
+
+	return 0;
+
+err_fb_info_destroy:
+	drm_fb_helper_release_fbi(helper);
+err_gem_free_object:
+	dev->driver->gem_free_object(&obj->base);
+	return ret;
+}
+
+static const struct drm_fb_helper_funcs drm_fb_cma_helper_funcs = {
+	.fb_probe = drm_fbdev_cma_create,
+};
+
+struct drm_fbdev_cma *arcpgu_fbdev_cma_init(struct drm_device *dev,
+	unsigned int preferred_bpp, unsigned int num_crtc,
+	unsigned int max_conn_count)
+{
+	struct drm_fbdev_cma *fbdev_cma;
+	struct drm_fb_helper *helper;
+	int ret;
+
+	fbdev_cma = kzalloc(sizeof(*fbdev_cma), GFP_KERNEL);
+	if (!fbdev_cma) {
+		dev_err(dev->dev, "Failed to allocate drm fbdev.\n");
+		return ERR_PTR(-ENOMEM);
+	}
+
+	helper = &fbdev_cma->fb_helper;
+
+	drm_fb_helper_prepare(dev, helper, &drm_fb_cma_helper_funcs);
+
+	ret = drm_fb_helper_init(dev, helper, num_crtc, max_conn_count);
+	if (ret < 0) {
+		dev_err(dev->dev, "Failed to initialize drm fb helper.\n");
+		goto err_free;
+	}
+
+	ret = drm_fb_helper_single_add_all_connectors(helper);
+	if (ret < 0) {
+		dev_err(dev->dev, "Failed to add connectors.\n");
+		goto err_drm_fb_helper_fini;
+
+	}
+
+	ret = drm_fb_helper_initial_config(helper, preferred_bpp);
+	if (ret < 0) {
+		dev_err(dev->dev, "Failed to set initial hw configuration.\n");
+		goto err_drm_fb_helper_fini;
+	}
+
+	return fbdev_cma;
+
+err_drm_fb_helper_fini:
+	drm_fb_helper_fini(helper);
+err_free:
+	kfree(fbdev_cma);
+
+	return ERR_PTR(ret);
+}
diff --git a/drivers/gpu/drm/arc/arcpgu_hdmi.c b/drivers/gpu/drm/arc/arcpgu_hdmi.c
new file mode 100644
index 0000000..7adafa3
--- /dev/null
+++ b/drivers/gpu/drm/arc/arcpgu_hdmi.c
@@ -0,0 +1,207 @@
+/*
+ * ARC PGU DRM driver.
+ *
+ * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_encoder_slave.h>
+#include <drm/drm_atomic_helper.h>
+
+#include "arcpgu.h"
+
+struct arcpgu_drm_connector {
+	struct drm_connector connector;
+	struct drm_encoder_slave *encoder_slave;
+};
+
+static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
+{
+	const struct drm_encoder_slave_funcs *sfuncs;
+	struct drm_encoder_slave *slave;
+	struct arcpgu_drm_connector *con =
+		container_of(connector, struct arcpgu_drm_connector, connector);
+
+	slave = con->encoder_slave;
+	if (slave == NULL) {
+		dev_err(connector->dev->dev,
+			"connector_get_modes: cannot find slave encoder for connector\n");
+		return 0;
+	}
+
+	sfuncs = slave->slave_funcs;
+	if (sfuncs->get_modes == NULL)
+		return 0;
+
+	return sfuncs->get_modes(&slave->base, connector);
+}
+
+struct drm_encoder *
+arcpgu_drm_connector_best_encoder(struct drm_connector *connector)
+{
+	struct drm_encoder_slave *slave;
+	struct arcpgu_drm_connector *con =
+		container_of(connector, struct arcpgu_drm_connector, connector);
+
+	slave = con->encoder_slave;
+	if (slave == NULL) {
+		dev_err(connector->dev->dev,
+			"connector_best_encoder: cannot find slave encoder for connector\n");
+		return NULL;
+	}
+
+	return &slave->base;
+}
+
+static enum drm_connector_status
+arcpgu_drm_connector_detect(struct drm_connector *connector, bool force)
+{
+	enum drm_connector_status status = connector_status_unknown;
+	const struct drm_encoder_slave_funcs *sfuncs;
+	struct drm_encoder_slave *slave;
+
+	struct arcpgu_drm_connector *con =
+		container_of(connector, struct arcpgu_drm_connector, connector);
+
+	slave = con->encoder_slave;
+	if (slave == NULL) {
+		dev_err(connector->dev->dev,
+			"connector_detect: cannot find slave encoder for connector\n");
+		return status;
+	}
+
+	sfuncs = slave->slave_funcs;
+	if (sfuncs && sfuncs->detect)
+		return sfuncs->detect(&slave->base, connector);
+
+	dev_err(connector->dev->dev, "connector_detect: could not detect slave funcs\n");
+	return status;
+}
+
+static void arcpgu_drm_connector_destroy(struct drm_connector *connector)
+{
+	drm_connector_unregister(connector);
+	drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_helper_funcs
+arcpgu_drm_connector_helper_funcs = {
+	.get_modes = arcpgu_drm_connector_get_modes,
+	.best_encoder = arcpgu_drm_connector_best_encoder,
+};
+
+static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
+	.dpms = drm_helper_connector_dpms,
+	.reset = drm_atomic_helper_connector_reset,
+	.detect = arcpgu_drm_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = arcpgu_drm_connector_destroy,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static struct drm_encoder_helper_funcs arcpgu_drm_encoder_helper_funcs = {
+	.dpms = drm_i2c_encoder_dpms,
+	.mode_fixup = drm_i2c_encoder_mode_fixup,
+	.mode_set = drm_i2c_encoder_mode_set,
+	.prepare = drm_i2c_encoder_prepare,
+	.commit = drm_i2c_encoder_commit,
+	.detect = drm_i2c_encoder_detect,
+};
+
+static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+int arcpgu_drm_hdmi_init(struct drm_device *drm, struct device_node *np)
+{
+	struct arcpgu_drm_connector *arcpgu_connector;
+	struct drm_i2c_encoder_driver *driver;
+	struct drm_encoder_slave *encoder;
+	struct drm_connector *connector;
+	struct i2c_client *i2c_slave;
+	int ret;
+
+	encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
+	if (encoder == NULL)
+		return -ENOMEM;
+
+	i2c_slave = of_find_i2c_device_by_node(np);
+	if (!i2c_slave || !i2c_get_clientdata(i2c_slave)) {
+		dev_err(drm->dev, "failed to find i2c slave encoder\n");
+		return -EPROBE_DEFER;
+	}
+
+	if (i2c_slave->dev.driver == NULL) {
+		dev_err(drm->dev, "failed to find i2c slave driver\n");
+		return -EPROBE_DEFER;
+	}
+
+	driver =
+	    to_drm_i2c_encoder_driver(to_i2c_driver(i2c_slave->dev.driver));
+	ret = driver->encoder_init(i2c_slave, drm, encoder);
+	if (ret) {
+		dev_err(drm->dev, "failed to initialize i2c encoder slave\n");
+		return ret;
+	}
+
+	encoder->base.possible_crtcs = 1;
+	encoder->base.possible_clones = 0;
+	ret = drm_encoder_init(drm, &encoder->base, &arcpgu_drm_encoder_funcs,
+			       DRM_MODE_ENCODER_TMDS, NULL);
+	if (ret)
+		return ret;
+
+	drm_encoder_helper_add(&encoder->base,
+			       &arcpgu_drm_encoder_helper_funcs);
+
+	arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
+					GFP_KERNEL);
+	if (!arcpgu_connector) {
+		ret = -ENOMEM;
+		goto error_encoder_cleanup;
+	}
+
+	connector = &arcpgu_connector->connector;
+	drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
+	ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
+			DRM_MODE_CONNECTOR_HDMIA);
+	if (ret < 0) {
+		dev_err(drm->dev, "failed to initialize drm connector\n");
+		goto error_encoder_cleanup;
+	}
+
+	ret = drm_connector_register(connector);
+	if (ret < 0) {
+		dev_err(drm->dev, "failed to regiter DRM connector and helper funcs\n");
+		goto error_connector_cleanup;
+	}
+
+	ret = drm_mode_connector_attach_encoder(connector, &encoder->base);
+	if (ret < 0) {
+		dev_err(drm->dev, "could not attach connector to encoder\n");
+		drm_connector_unregister(connector);
+		goto error_connector_cleanup;
+	}
+
+	arcpgu_connector->encoder_slave = encoder;
+
+	return 0;
+
+error_connector_cleanup:
+	drm_connector_cleanup(connector);
+
+error_encoder_cleanup:
+	drm_encoder_cleanup(&encoder->base);
+	return ret;
+}
diff --git a/drivers/gpu/drm/arc/arcpgu_regs.h b/drivers/gpu/drm/arc/arcpgu_regs.h
new file mode 100644
index 0000000..f04165f
--- /dev/null
+++ b/drivers/gpu/drm/arc/arcpgu_regs.h
@@ -0,0 +1,36 @@
+/*
+ * ARC PGU DRM driver.
+ *
+ * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.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.
+ *
+ */
+
+#ifndef _ARC_PGU_REGS_H_
+#define _ARC_PGU_REGS_H_
+
+#define ARCPGU_REG_CTRL		0x00
+#define ARCPGU_REG_STAT		0x04
+#define ARCPGU_REG_FMT		0x10
+#define ARCPGU_REG_HSYNC	0x14
+#define ARCPGU_REG_VSYNC	0x18
+#define ARCPGU_REG_ACTIVE	0x1c
+#define ARCPGU_REG_BUF0_ADDR	0x40
+#define ARCPGU_REG_STRIDE	0x50
+#define ARCPGU_REG_START_SET	0x84
+
+#define ARCPGU_REG_ID		0x3FC
+
+#define ARCPGU_CTRL_ENABLE_MASK	0x02
+#define ARCPGU_MODE_RGB888_MASK	0x04
+#define ARCPGU_STAT_BUSY_MASK	0x02
+
+#endif
-- 
2.5.0

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