drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.

This patch adds an initial DRM driver for the Mediatek MT8173 DISP
subsystem. It currently supports two fixed output streams from the
OVL0/OVL1 sources to the DSI0/DPI0 sinks, respectively.

Signed-off-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: YT Shen <yt.shen@mediatek.com>
Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Bibby Hsieh <bibby.hsieh@mediatek.com>
Signed-off-by: Mao Huang <littlecvr@chromium.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

drivers/gpu/drm/Kconfig

@@ -288,3 +288,5 @@ source "drivers/gpu/drm/etnaviv/Kconfig"
 source "drivers/gpu/drm/arc/Kconfig"
 
 source "drivers/gpu/drm/hisilicon/Kconfig"
+
+source "drivers/gpu/drm/mediatek/Kconfig"

drivers/gpu/drm/Makefile

@@ -74,6 +74,7 @@ obj-$(CONFIG_DRM_MSM) += msm/
 obj-$(CONFIG_DRM_TEGRA) += tegra/
 obj-$(CONFIG_DRM_STI) += sti/
 obj-$(CONFIG_DRM_IMX) += imx/
+obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
 obj-y			+= i2c/
 obj-y			+= panel/
 obj-y			+= bridge/

drivers/gpu/drm/mediatek/Kconfig

@@ -0,0 +1,14 @@
+config DRM_MEDIATEK
+	tristate "DRM Support for Mediatek SoCs"
+	depends on DRM
+	depends on ARCH_MEDIATEK || (ARM && COMPILE_TEST)
+	select DRM_GEM_CMA_HELPER
+	select DRM_KMS_HELPER
+	select IOMMU_DMA
+	select MEMORY
+	select MTK_SMI
+	help
+	  Choose this option if you have a Mediatek SoCs.
+	  The module will be called mediatek-drm
+	  This driver provides kernel mode setting and
+	  buffer management to userspace.

drivers/gpu/drm/mediatek/Makefile

@@ -0,0 +1,11 @@
+mediatek-drm-y := mtk_disp_ovl.o \
+		  mtk_disp_rdma.o \
+		  mtk_drm_crtc.o \
+		  mtk_drm_ddp.o \
+		  mtk_drm_ddp_comp.o \
+		  mtk_drm_drv.o \
+		  mtk_drm_fb.o \
+		  mtk_drm_gem.o \
+		  mtk_drm_plane.o
+
+obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o

drivers/gpu/drm/mediatek/mtk_disp_ovl.c

@@ -0,0 +1,302 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ *
+ * 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/drmP.h>
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+
+#include "mtk_drm_crtc.h"
+#include "mtk_drm_ddp_comp.h"
+
+#define DISP_REG_OVL_INTEN			0x0004
+#define OVL_FME_CPL_INT					BIT(1)
+#define DISP_REG_OVL_INTSTA			0x0008
+#define DISP_REG_OVL_EN				0x000c
+#define DISP_REG_OVL_RST			0x0014
+#define DISP_REG_OVL_ROI_SIZE			0x0020
+#define DISP_REG_OVL_ROI_BGCLR			0x0028
+#define DISP_REG_OVL_SRC_CON			0x002c
+#define DISP_REG_OVL_CON(n)			(0x0030 + 0x20 * (n))
+#define DISP_REG_OVL_SRC_SIZE(n)		(0x0038 + 0x20 * (n))
+#define DISP_REG_OVL_OFFSET(n)			(0x003c + 0x20 * (n))
+#define DISP_REG_OVL_PITCH(n)			(0x0044 + 0x20 * (n))
+#define DISP_REG_OVL_RDMA_CTRL(n)		(0x00c0 + 0x20 * (n))
+#define DISP_REG_OVL_RDMA_GMC(n)		(0x00c8 + 0x20 * (n))
+#define DISP_REG_OVL_ADDR(n)			(0x0f40 + 0x20 * (n))
+
+#define	OVL_RDMA_MEM_GMC	0x40402020
+
+#define OVL_CON_BYTE_SWAP	BIT(24)
+#define OVL_CON_CLRFMT_RGB565	(0 << 12)
+#define OVL_CON_CLRFMT_RGB888	(1 << 12)
+#define OVL_CON_CLRFMT_RGBA8888	(2 << 12)
+#define OVL_CON_CLRFMT_ARGB8888	(3 << 12)
+#define	OVL_CON_AEN		BIT(8)
+#define	OVL_CON_ALPHA		0xff
+
+/**
+ * struct mtk_disp_ovl - DISP_OVL driver structure
+ * @ddp_comp - structure containing type enum and hardware resources
+ * @crtc - associated crtc to report vblank events to
+ */
+struct mtk_disp_ovl {
+	struct mtk_ddp_comp		ddp_comp;
+	struct drm_crtc			*crtc;
+};
+
+static irqreturn_t mtk_disp_ovl_irq_handler(int irq, void *dev_id)
+{
+	struct mtk_disp_ovl *priv = dev_id;
+	struct mtk_ddp_comp *ovl = &priv->ddp_comp;
+
+	/* Clear frame completion interrupt */
+	writel(0x0, ovl->regs + DISP_REG_OVL_INTSTA);
+
+	if (!priv->crtc)
+		return IRQ_NONE;
+
+	mtk_crtc_ddp_irq(priv->crtc, ovl);
+
+	return IRQ_HANDLED;
+}
+
+static void mtk_ovl_enable_vblank(struct mtk_ddp_comp *comp,
+				  struct drm_crtc *crtc)
+{
+	struct mtk_disp_ovl *priv = container_of(comp, struct mtk_disp_ovl,
+						 ddp_comp);
+
+	priv->crtc = crtc;
+	writel_relaxed(OVL_FME_CPL_INT, comp->regs + DISP_REG_OVL_INTEN);
+}
+
+static void mtk_ovl_disable_vblank(struct mtk_ddp_comp *comp)
+{
+	struct mtk_disp_ovl *priv = container_of(comp, struct mtk_disp_ovl,
+						 ddp_comp);
+
+	priv->crtc = NULL;
+	writel_relaxed(0x0, comp->regs + DISP_REG_OVL_INTEN);
+}
+
+static void mtk_ovl_start(struct mtk_ddp_comp *comp)
+{
+	writel_relaxed(0x1, comp->regs + DISP_REG_OVL_EN);
+}
+
+static void mtk_ovl_stop(struct mtk_ddp_comp *comp)
+{
+	writel_relaxed(0x0, comp->regs + DISP_REG_OVL_EN);
+}
+
+static void mtk_ovl_config(struct mtk_ddp_comp *comp, unsigned int w,
+			   unsigned int h, unsigned int vrefresh)
+{
+	if (w != 0 && h != 0)
+		writel_relaxed(h << 16 | w, comp->regs + DISP_REG_OVL_ROI_SIZE);
+	writel_relaxed(0x0, comp->regs + DISP_REG_OVL_ROI_BGCLR);
+
+	writel(0x1, comp->regs + DISP_REG_OVL_RST);
+	writel(0x0, comp->regs + DISP_REG_OVL_RST);
+}
+
+static void mtk_ovl_layer_on(struct mtk_ddp_comp *comp, unsigned int idx)
+{
+	unsigned int reg;
+
+	writel(0x1, comp->regs + DISP_REG_OVL_RDMA_CTRL(idx));
+	writel(OVL_RDMA_MEM_GMC, comp->regs + DISP_REG_OVL_RDMA_GMC(idx));
+
+	reg = readl(comp->regs + DISP_REG_OVL_SRC_CON);
+	reg = reg | BIT(idx);
+	writel(reg, comp->regs + DISP_REG_OVL_SRC_CON);
+}
+
+static void mtk_ovl_layer_off(struct mtk_ddp_comp *comp, unsigned int idx)
+{
+	unsigned int reg;
+
+	reg = readl(comp->regs + DISP_REG_OVL_SRC_CON);
+	reg = reg & ~BIT(idx);
+	writel(reg, comp->regs + DISP_REG_OVL_SRC_CON);
+
+	writel(0x0, comp->regs + DISP_REG_OVL_RDMA_CTRL(idx));
+}
+
+static unsigned int ovl_fmt_convert(unsigned int fmt)
+{
+	switch (fmt) {
+	default:
+	case DRM_FORMAT_RGB565:
+		return OVL_CON_CLRFMT_RGB565;
+	case DRM_FORMAT_BGR565:
+		return OVL_CON_CLRFMT_RGB565 | OVL_CON_BYTE_SWAP;
+	case DRM_FORMAT_RGB888:
+		return OVL_CON_CLRFMT_RGB888;
+	case DRM_FORMAT_BGR888:
+		return OVL_CON_CLRFMT_RGB888 | OVL_CON_BYTE_SWAP;
+	case DRM_FORMAT_RGBX8888:
+	case DRM_FORMAT_RGBA8888:
+		return OVL_CON_CLRFMT_ARGB8888;
+	case DRM_FORMAT_BGRX8888:
+	case DRM_FORMAT_BGRA8888:
+		return OVL_CON_CLRFMT_ARGB8888 | OVL_CON_BYTE_SWAP;
+	case DRM_FORMAT_XRGB8888:
+	case DRM_FORMAT_ARGB8888:
+		return OVL_CON_CLRFMT_RGBA8888;
+	case DRM_FORMAT_XBGR8888:
+	case DRM_FORMAT_ABGR8888:
+		return OVL_CON_CLRFMT_RGBA8888 | OVL_CON_BYTE_SWAP;
+	}
+}
+
+static void mtk_ovl_layer_config(struct mtk_ddp_comp *comp, unsigned int idx,
+				 struct mtk_plane_state *state)
+{
+	struct mtk_plane_pending_state *pending = &state->pending;
+	unsigned int addr = pending->addr;
+	unsigned int pitch = pending->pitch & 0xffff;
+	unsigned int fmt = pending->format;
+	unsigned int offset = (pending->y << 16) | pending->x;
+	unsigned int src_size = (pending->height << 16) | pending->width;
+	unsigned int con;
+
+	if (!pending->enable)
+		mtk_ovl_layer_off(comp, idx);
+
+	con = ovl_fmt_convert(fmt);
+	if (idx != 0)
+		con |= OVL_CON_AEN | OVL_CON_ALPHA;
+
+	writel_relaxed(con, comp->regs + DISP_REG_OVL_CON(idx));
+	writel_relaxed(pitch, comp->regs + DISP_REG_OVL_PITCH(idx));
+	writel_relaxed(src_size, comp->regs + DISP_REG_OVL_SRC_SIZE(idx));
+	writel_relaxed(offset, comp->regs + DISP_REG_OVL_OFFSET(idx));
+	writel_relaxed(addr, comp->regs + DISP_REG_OVL_ADDR(idx));
+
+	if (pending->enable)
+		mtk_ovl_layer_on(comp, idx);
+}
+
+static const struct mtk_ddp_comp_funcs mtk_disp_ovl_funcs = {
+	.config = mtk_ovl_config,
+	.start = mtk_ovl_start,
+	.stop = mtk_ovl_stop,
+	.enable_vblank = mtk_ovl_enable_vblank,
+	.disable_vblank = mtk_ovl_disable_vblank,
+	.layer_on = mtk_ovl_layer_on,
+	.layer_off = mtk_ovl_layer_off,
+	.layer_config = mtk_ovl_layer_config,
+};
+
+static int mtk_disp_ovl_bind(struct device *dev, struct device *master,
+			     void *data)
+{
+	struct mtk_disp_ovl *priv = dev_get_drvdata(dev);
+	struct drm_device *drm_dev = data;
+	int ret;
+
+	ret = mtk_ddp_comp_register(drm_dev, &priv->ddp_comp);
+	if (ret < 0) {
+		dev_err(dev, "Failed to register component %s: %d\n",
+			dev->of_node->full_name, ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void mtk_disp_ovl_unbind(struct device *dev, struct device *master,
+				void *data)
+{
+	struct mtk_disp_ovl *priv = dev_get_drvdata(dev);
+	struct drm_device *drm_dev = data;
+
+	mtk_ddp_comp_unregister(drm_dev, &priv->ddp_comp);
+}
+
+static const struct component_ops mtk_disp_ovl_component_ops = {
+	.bind	= mtk_disp_ovl_bind,
+	.unbind = mtk_disp_ovl_unbind,
+};
+
+static int mtk_disp_ovl_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mtk_disp_ovl *priv;
+	int comp_id;
+	int irq;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ret = devm_request_irq(dev, irq, mtk_disp_ovl_irq_handler,
+			       IRQF_TRIGGER_NONE, dev_name(dev), priv);
+	if (ret < 0) {
+		dev_err(dev, "Failed to request irq %d: %d\n", irq, ret);
+		return ret;
+	}
+
+	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DISP_OVL);
+	if (comp_id < 0) {
+		dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
+		return comp_id;
+	}
+
+	ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id,
+				&mtk_disp_ovl_funcs);
+	if (ret) {
+		dev_err(dev, "Failed to initialize component: %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	ret = component_add(dev, &mtk_disp_ovl_component_ops);
+	if (ret)
+		dev_err(dev, "Failed to add component: %d\n", ret);
+
+	return ret;
+}
+
+static int mtk_disp_ovl_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &mtk_disp_ovl_component_ops);
+
+	return 0;
+}
+
+static const struct of_device_id mtk_disp_ovl_driver_dt_match[] = {
+	{ .compatible = "mediatek,mt8173-disp-ovl", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtk_disp_ovl_driver_dt_match);
+
+struct platform_driver mtk_disp_ovl_driver = {
+	.probe		= mtk_disp_ovl_probe,
+	.remove		= mtk_disp_ovl_remove,
+	.driver		= {
+		.name	= "mediatek-disp-ovl",
+		.owner	= THIS_MODULE,
+		.of_match_table = mtk_disp_ovl_driver_dt_match,
+	},
+};