1 files changed, 240 insertions, 0 deletions
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
new file mode 100644
index 000000000000..5fb80cbe4c5b
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c
@@ -0,0 +1,240 @@
+/*
+ * 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_RDMA_INT_ENABLE		0x0000
+#define DISP_REG_RDMA_INT_STATUS		0x0004
+#define RDMA_TARGET_LINE_INT				BIT(5)
+#define RDMA_FIFO_UNDERFLOW_INT				BIT(4)
+#define RDMA_EOF_ABNORMAL_INT				BIT(3)
+#define RDMA_FRAME_END_INT				BIT(2)
+#define RDMA_FRAME_START_INT				BIT(1)
+#define RDMA_REG_UPDATE_INT				BIT(0)
+#define DISP_REG_RDMA_GLOBAL_CON		0x0010
+#define RDMA_ENGINE_EN					BIT(0)
+#define DISP_REG_RDMA_SIZE_CON_0		0x0014
+#define DISP_REG_RDMA_SIZE_CON_1		0x0018
+#define DISP_REG_RDMA_TARGET_LINE		0x001c
+#define DISP_REG_RDMA_FIFO_CON			0x0040
+#define RDMA_FIFO_UNDERFLOW_EN				BIT(31)
+#define RDMA_FIFO_PSEUDO_SIZE(bytes)			(((bytes) / 16) << 16)
+#define RDMA_OUTPUT_VALID_FIFO_THRESHOLD(bytes)		((bytes) / 16)
+
+/**
+ * struct mtk_disp_rdma - DISP_RDMA driver structure
+ * @ddp_comp - structure containing type enum and hardware resources
+ * @crtc - associated crtc to report irq events to
+ */
+struct mtk_disp_rdma {
+	struct mtk_ddp_comp		ddp_comp;
+	struct drm_crtc			*crtc;
+};
+
+static irqreturn_t mtk_disp_rdma_irq_handler(int irq, void *dev_id)
+{
+	struct mtk_disp_rdma *priv = dev_id;
+	struct mtk_ddp_comp *rdma = &priv->ddp_comp;
+
+	/* Clear frame completion interrupt */
+	writel(0x0, rdma->regs + DISP_REG_RDMA_INT_STATUS);
+
+	if (!priv->crtc)
+		return IRQ_NONE;
+
+	mtk_crtc_ddp_irq(priv->crtc, rdma);
+
+	return IRQ_HANDLED;
+}
+
+static void rdma_update_bits(struct mtk_ddp_comp *comp, unsigned int reg,
+			     unsigned int mask, unsigned int val)
+{
+	unsigned int tmp = readl(comp->regs + reg);
+
+	tmp = (tmp & ~mask) | (val & mask);
+	writel(tmp, comp->regs + reg);
+}
+
+static void mtk_rdma_enable_vblank(struct mtk_ddp_comp *comp,
+				   struct drm_crtc *crtc)
+{
+	struct mtk_disp_rdma *priv = container_of(comp, struct mtk_disp_rdma,
+						  ddp_comp);
+
+	priv->crtc = crtc;
+	rdma_update_bits(comp, DISP_REG_RDMA_INT_ENABLE, RDMA_FRAME_END_INT,
+			 RDMA_FRAME_END_INT);
+}
+
+static void mtk_rdma_disable_vblank(struct mtk_ddp_comp *comp)
+{
+	struct mtk_disp_rdma *priv = container_of(comp, struct mtk_disp_rdma,
+						  ddp_comp);
+
+	priv->crtc = NULL;
+	rdma_update_bits(comp, DISP_REG_RDMA_INT_ENABLE, RDMA_FRAME_END_INT, 0);
+}
+
+static void mtk_rdma_start(struct mtk_ddp_comp *comp)
+{
+	rdma_update_bits(comp, DISP_REG_RDMA_GLOBAL_CON, RDMA_ENGINE_EN,
+			 RDMA_ENGINE_EN);
+}
+
+static void mtk_rdma_stop(struct mtk_ddp_comp *comp)
+{
+	rdma_update_bits(comp, DISP_REG_RDMA_GLOBAL_CON, RDMA_ENGINE_EN, 0);
+}
+
+static void mtk_rdma_config(struct mtk_ddp_comp *comp, unsigned int width,
+			    unsigned int height, unsigned int vrefresh)
+{
+	unsigned int threshold;
+	unsigned int reg;
+
+	rdma_update_bits(comp, DISP_REG_RDMA_SIZE_CON_0, 0xfff, width);
+	rdma_update_bits(comp, DISP_REG_RDMA_SIZE_CON_1, 0xfffff, height);
+
+	/*
+	 * Enable FIFO underflow since DSI and DPI can't be blocked.
+	 * Keep the FIFO pseudo size reset default of 8 KiB. Set the
+	 * output threshold to 6 microseconds with 7/6 overhead to
+	 * account for blanking, and with a pixel depth of 4 bytes:
+	 */
+	threshold = width * height * vrefresh * 4 * 7 / 1000000;
+	reg = RDMA_FIFO_UNDERFLOW_EN |
+	      RDMA_FIFO_PSEUDO_SIZE(SZ_8K) |
+	      RDMA_OUTPUT_VALID_FIFO_THRESHOLD(threshold);
+	writel(reg, comp->regs + DISP_REG_RDMA_FIFO_CON);
+}
+
+static const struct mtk_ddp_comp_funcs mtk_disp_rdma_funcs = {
+	.config = mtk_rdma_config,
+	.start = mtk_rdma_start,
+	.stop = mtk_rdma_stop,
+	.enable_vblank = mtk_rdma_enable_vblank,
+	.disable_vblank = mtk_rdma_disable_vblank,
+};
+
+static int mtk_disp_rdma_bind(struct device *dev, struct device *master,
+			      void *data)
+{
+	struct mtk_disp_rdma *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_rdma_unbind(struct device *dev, struct device *master,
+				 void *data)
+{
+	struct mtk_disp_rdma *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_rdma_component_ops = {
+	.bind	= mtk_disp_rdma_bind,
+	.unbind = mtk_disp_rdma_unbind,
+};
+
+static int mtk_disp_rdma_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mtk_disp_rdma *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;
+
+	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DISP_RDMA);
+	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_rdma_funcs);
+	if (ret) {
+		dev_err(dev, "Failed to initialize component: %d\n", ret);
+		return ret;
+	}
+
+	/* Disable and clear pending interrupts */
+	writel(0x0, priv->ddp_comp.regs + DISP_REG_RDMA_INT_ENABLE);
+	writel(0x0, priv->ddp_comp.regs + DISP_REG_RDMA_INT_STATUS);
+
+	ret = devm_request_irq(dev, irq, mtk_disp_rdma_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;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	ret = component_add(dev, &mtk_disp_rdma_component_ops);
+	if (ret)
+		dev_err(dev, "Failed to add component: %d\n", ret);
+
+	return ret;
+}
+
+static int mtk_disp_rdma_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &mtk_disp_rdma_component_ops);
+
+	return 0;
+}
+
+static const struct of_device_id mtk_disp_rdma_driver_dt_match[] = {
+	{ .compatible = "mediatek,mt8173-disp-rdma", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtk_disp_rdma_driver_dt_match);
+
+struct platform_driver mtk_disp_rdma_driver = {
+	.probe		= mtk_disp_rdma_probe,
+	.remove		= mtk_disp_rdma_remove,
+	.driver		= {
+		.name	= "mediatek-disp-rdma",
+		.owner	= THIS_MODULE,
+		.of_match_table = mtk_disp_rdma_driver_dt_match,
+	},
+};