1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tve200/tve200_drv.c b/drivers/gpu/drm/tve200/tve200_drv.c
new file mode 100644
index 000000000..04db72e3f
--- /dev/null
+++ b/drivers/gpu/drm/tve200/tve200_drv.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
+ * Parts of this file were based on sources as follows:
+ *
+ * Copyright (C) 2006-2008 Intel Corporation
+ * Copyright (C) 2007 Amos Lee <amos_lee@storlinksemi.com>
+ * Copyright (C) 2007 Dave Airlie <airlied@linux.ie>
+ * Copyright (C) 2011 Texas Instruments
+ * Copyright (C) 2017 Eric Anholt
+ */
+
+/**
+ * DOC: Faraday TV Encoder TVE200 DRM Driver
+ *
+ * The Faraday TV Encoder TVE200 is also known as the Gemini TV Interface
+ * Controller (TVC) and is found in the Gemini Chipset from Storlink
+ * Semiconductor (later Storm Semiconductor, later Cortina Systems)
+ * but also in the Grain Media GM8180 chipset. On the Gemini the module
+ * is connected to 8 data lines and a single clock line, comprising an
+ * 8-bit BT.656 interface.
+ *
+ * This is a very basic YUV display driver. The datasheet specifies that
+ * it supports the ITU BT.656 standard. It requires a 27 MHz clock which is
+ * the hallmark of any TV encoder supporting both PAL and NTSC.
+ *
+ * This driver exposes a standard KMS interface for this TV encoder.
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-buf.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/shmem_fs.h>
+#include <linux/slab.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_module.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "tve200_drm.h"
+
+#define DRIVER_DESC      "DRM module for Faraday TVE200"
+
+static const struct drm_mode_config_funcs mode_config_funcs = {
+	.fb_create = drm_gem_fb_create,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+};
+
+static int tve200_modeset_init(struct drm_device *dev)
+{
+	struct drm_mode_config *mode_config;
+	struct tve200_drm_dev_private *priv = dev->dev_private;
+	struct drm_panel *panel;
+	struct drm_bridge *bridge;
+	int ret;
+
+	drm_mode_config_init(dev);
+	mode_config = &dev->mode_config;
+	mode_config->funcs = &mode_config_funcs;
+	mode_config->min_width = 352;
+	mode_config->max_width = 720;
+	mode_config->min_height = 240;
+	mode_config->max_height = 576;
+
+	ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
+					  0, 0, &panel, &bridge);
+	if (ret && ret != -ENODEV)
+		return ret;
+	if (panel) {
+		bridge = drm_panel_bridge_add_typed(panel,
+						    DRM_MODE_CONNECTOR_Unknown);
+		if (IS_ERR(bridge)) {
+			ret = PTR_ERR(bridge);
+			goto out_bridge;
+		}
+	} else {
+		/*
+		 * TODO: when we are using a different bridge than a panel
+		 * (such as a dumb VGA connector) we need to devise a different
+		 * method to get the connector out of the bridge.
+		 */
+		dev_err(dev->dev, "the bridge is not a panel\n");
+		ret = -EINVAL;
+		goto out_bridge;
+	}
+
+	ret = tve200_display_init(dev);
+	if (ret) {
+		dev_err(dev->dev, "failed to init display\n");
+		goto out_bridge;
+	}
+
+	ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
+						    bridge);
+	if (ret) {
+		dev_err(dev->dev, "failed to attach bridge\n");
+		goto out_bridge;
+	}
+
+	priv->panel = panel;
+	priv->connector = drm_panel_bridge_connector(bridge);
+	priv->bridge = bridge;
+
+	dev_info(dev->dev, "attached to panel %s\n",
+		 dev_name(panel->dev));
+
+	ret = drm_vblank_init(dev, 1);
+	if (ret) {
+		dev_err(dev->dev, "failed to init vblank\n");
+		goto out_bridge;
+	}
+
+	drm_mode_config_reset(dev);
+	drm_kms_helper_poll_init(dev);
+
+	goto finish;
+
+out_bridge:
+	if (panel)
+		drm_panel_bridge_remove(bridge);
+	drm_mode_config_cleanup(dev);
+finish:
+	return ret;
+}
+
+DEFINE_DRM_GEM_DMA_FOPS(drm_fops);
+
+static const struct drm_driver tve200_drm_driver = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+	.ioctls = NULL,
+	.fops = &drm_fops,
+	.name = "tve200",
+	.desc = DRIVER_DESC,
+	.date = "20170703",
+	.major = 1,
+	.minor = 0,
+	.patchlevel = 0,
+	DRM_GEM_DMA_DRIVER_OPS,
+};
+
+static int tve200_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct tve200_drm_dev_private *priv;
+	struct drm_device *drm;
+	struct resource *res;
+	int irq;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	drm = drm_dev_alloc(&tve200_drm_driver, dev);
+	if (IS_ERR(drm))
+		return PTR_ERR(drm);
+	platform_set_drvdata(pdev, drm);
+	priv->drm = drm;
+	drm->dev_private = priv;
+
+	/* Clock the silicon so we can access the registers */
+	priv->pclk = devm_clk_get(dev, "PCLK");
+	if (IS_ERR(priv->pclk)) {
+		dev_err(dev, "unable to get PCLK\n");
+		ret = PTR_ERR(priv->pclk);
+		goto dev_unref;
+	}
+	ret = clk_prepare_enable(priv->pclk);
+	if (ret) {
+		dev_err(dev, "failed to enable PCLK\n");
+		goto dev_unref;
+	}
+
+	/* This clock is for the pixels (27MHz) */
+	priv->clk = devm_clk_get(dev, "TVE");
+	if (IS_ERR(priv->clk)) {
+		dev_err(dev, "unable to get TVE clock\n");
+		ret = PTR_ERR(priv->clk);
+		goto clk_disable;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->regs)) {
+		dev_err(dev, "%s failed mmio\n", __func__);
+		ret = -EINVAL;
+		goto clk_disable;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		ret = irq;
+		goto clk_disable;
+	}
+
+	/* turn off interrupts before requesting the irq */
+	writel(0, priv->regs + TVE200_INT_EN);
+
+	ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
+	if (ret) {
+		dev_err(dev, "failed to request irq %d\n", ret);
+		goto clk_disable;
+	}
+
+	ret = tve200_modeset_init(drm);
+	if (ret)
+		goto clk_disable;
+
+	ret = drm_dev_register(drm, 0);
+	if (ret < 0)
+		goto clk_disable;
+
+	/*
+	 * Passing in 16 here will make the RGB565 mode the default
+	 * Passing in 32 will use XRGB8888 mode
+	 */
+	drm_fbdev_generic_setup(drm, 16);
+
+	return 0;
+
+clk_disable:
+	clk_disable_unprepare(priv->pclk);
+dev_unref:
+	drm_dev_put(drm);
+	return ret;
+}
+
+static int tve200_remove(struct platform_device *pdev)
+{
+	struct drm_device *drm = platform_get_drvdata(pdev);
+	struct tve200_drm_dev_private *priv = drm->dev_private;
+
+	drm_dev_unregister(drm);
+	if (priv->panel)
+		drm_panel_bridge_remove(priv->bridge);
+	drm_mode_config_cleanup(drm);
+	clk_disable_unprepare(priv->pclk);
+	drm_dev_put(drm);
+
+	return 0;
+}
+
+static const struct of_device_id tve200_of_match[] = {
+	{
+		.compatible = "faraday,tve200",
+	},
+	{},
+};
+
+static struct platform_driver tve200_driver = {
+	.driver = {
+		.name           = "tve200",
+		.of_match_table = of_match_ptr(tve200_of_match),
+	},
+	.probe = tve200_probe,
+	.remove = tve200_remove,
+};
+drm_module_platform_driver(tve200_driver);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
+MODULE_LICENSE("GPL");