1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c
new file mode 100644
index 000000000000..2f31822b2245
--- /dev/null
+++ b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c
@@ -0,0 +1,297 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * shmob_drm_drv.c  --  SH Mobile DRM driver
+ *
+ * Copyright (C) 2012 Renesas Electronics Corporation
+ *
+ * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include <drm/clients/drm_client_setup.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fbdev_dma.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_modeset_helper.h>
+#include <drm/drm_module.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "shmob_drm_drv.h"
+#include "shmob_drm_kms.h"
+#include "shmob_drm_plane.h"
+#include "shmob_drm_regs.h"
+
+/* -----------------------------------------------------------------------------
+ * Hardware initialization
+ */
+
+static int shmob_drm_setup_clocks(struct shmob_drm_device *sdev,
+				  enum shmob_drm_clk_source clksrc)
+{
+	struct clk *clk;
+	char *clkname;
+
+	switch (clksrc) {
+	case SHMOB_DRM_CLK_BUS:
+		clkname = "fck";
+		sdev->lddckr = LDDCKR_ICKSEL_BUS;
+		break;
+	case SHMOB_DRM_CLK_PERIPHERAL:
+		clkname = "media";
+		sdev->lddckr = LDDCKR_ICKSEL_MIPI;
+		break;
+	case SHMOB_DRM_CLK_EXTERNAL:
+		clkname = "lclk";
+		sdev->lddckr = LDDCKR_ICKSEL_HDMI;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	clk = devm_clk_get(sdev->dev, clkname);
+	if (IS_ERR(clk)) {
+		dev_err(sdev->dev, "cannot get dot clock %s\n", clkname);
+		return PTR_ERR(clk);
+	}
+
+	sdev->clock = clk;
+	return 0;
+}
+
+/* -----------------------------------------------------------------------------
+ * DRM operations
+ */
+
+static irqreturn_t shmob_drm_irq(int irq, void *arg)
+{
+	struct drm_device *dev = arg;
+	struct shmob_drm_device *sdev = to_shmob_device(dev);
+	unsigned long flags;
+	u32 status;
+
+	/* Acknowledge interrupts. Putting interrupt enable and interrupt flag
+	 * bits in the same register is really brain-dead design and requires
+	 * taking a spinlock.
+	 */
+	spin_lock_irqsave(&sdev->irq_lock, flags);
+	status = lcdc_read(sdev, LDINTR);
+	lcdc_write(sdev, LDINTR, status ^ LDINTR_STATUS_MASK);
+	spin_unlock_irqrestore(&sdev->irq_lock, flags);
+
+	if (status & LDINTR_VES) {
+		drm_crtc_handle_vblank(&sdev->crtc.base);
+		shmob_drm_crtc_finish_page_flip(&sdev->crtc);
+	}
+
+	return IRQ_HANDLED;
+}
+
+DEFINE_DRM_GEM_DMA_FOPS(shmob_drm_fops);
+
+static const struct drm_driver shmob_drm_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	DRM_GEM_DMA_DRIVER_OPS,
+	DRM_FBDEV_DMA_DRIVER_OPS,
+	.fops			= &shmob_drm_fops,
+	.name			= "shmob-drm",
+	.desc			= "Renesas SH Mobile DRM",
+	.major			= 1,
+	.minor			= 0,
+};
+
+/* -----------------------------------------------------------------------------
+ * Power management
+ */
+
+static int shmob_drm_pm_suspend(struct device *dev)
+{
+	struct shmob_drm_device *sdev = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_suspend(&sdev->ddev);
+}
+
+static int shmob_drm_pm_resume(struct device *dev)
+{
+	struct shmob_drm_device *sdev = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_resume(&sdev->ddev);
+}
+
+static int shmob_drm_pm_runtime_suspend(struct device *dev)
+{
+	struct shmob_drm_device *sdev = dev_get_drvdata(dev);
+
+	if (sdev->clock)
+		clk_disable_unprepare(sdev->clock);
+
+	return 0;
+}
+
+static int shmob_drm_pm_runtime_resume(struct device *dev)
+{
+	struct shmob_drm_device *sdev = dev_get_drvdata(dev);
+	int ret;
+
+	if (sdev->clock) {
+		ret = clk_prepare_enable(sdev->clock);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops shmob_drm_pm_ops = {
+	SYSTEM_SLEEP_PM_OPS(shmob_drm_pm_suspend, shmob_drm_pm_resume)
+	RUNTIME_PM_OPS(shmob_drm_pm_runtime_suspend,
+		       shmob_drm_pm_runtime_resume, NULL)
+};
+
+/* -----------------------------------------------------------------------------
+ * Platform driver
+ */
+
+static void shmob_drm_remove(struct platform_device *pdev)
+{
+	struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
+	struct drm_device *ddev = &sdev->ddev;
+
+	drm_dev_unregister(ddev);
+	drm_atomic_helper_shutdown(ddev);
+	drm_kms_helper_poll_fini(ddev);
+}
+
+static void shmob_drm_shutdown(struct platform_device *pdev)
+{
+	struct shmob_drm_device *sdev = platform_get_drvdata(pdev);
+
+	drm_atomic_helper_shutdown(&sdev->ddev);
+}
+
+static int shmob_drm_probe(struct platform_device *pdev)
+{
+	struct shmob_drm_platform_data *pdata = pdev->dev.platform_data;
+	const struct shmob_drm_config *config;
+	struct shmob_drm_device *sdev;
+	struct drm_device *ddev;
+	int ret;
+
+	config = of_device_get_match_data(&pdev->dev);
+	if (!config && !pdata) {
+		dev_err(&pdev->dev, "no platform data\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Allocate and initialize the DRM device, driver private data, I/O
+	 * resources and clocks.
+	 */
+	sdev = devm_drm_dev_alloc(&pdev->dev, &shmob_drm_driver,
+				  struct shmob_drm_device, ddev);
+	if (IS_ERR(sdev))
+		return PTR_ERR(sdev);
+
+	ddev = &sdev->ddev;
+	sdev->dev = &pdev->dev;
+	if (config) {
+		sdev->config = *config;
+	} else {
+		sdev->pdata = pdata;
+		sdev->config.clk_source = pdata->clk_source;
+		sdev->config.clk_div = pdata->iface.clk_div;
+	}
+	spin_lock_init(&sdev->irq_lock);
+
+	platform_set_drvdata(pdev, sdev);
+
+	sdev->mmio = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(sdev->mmio))
+		return PTR_ERR(sdev->mmio);
+
+	ret = shmob_drm_setup_clocks(sdev, sdev->config.clk_source);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_pm_runtime_enable(&pdev->dev);
+	if (ret)
+		return ret;
+
+	ret = drm_vblank_init(ddev, 1);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to initialize vblank\n");
+		return ret;
+	}
+
+	ret = shmob_drm_modeset_init(sdev);
+	if (ret < 0)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to initialize mode setting\n");
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		goto err_modeset_cleanup;
+	sdev->irq = ret;
+
+	ret = devm_request_irq(&pdev->dev, sdev->irq, shmob_drm_irq, 0,
+			       ddev->driver->name, ddev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to install IRQ handler\n");
+		goto err_modeset_cleanup;
+	}
+
+	/*
+	 * Register the DRM device with the core and the connectors with
+	 * sysfs.
+	 */
+	ret = drm_dev_register(ddev, 0);
+	if (ret < 0)
+		goto err_modeset_cleanup;
+
+	drm_client_setup_with_fourcc(ddev, DRM_FORMAT_RGB565);
+
+	return 0;
+
+err_modeset_cleanup:
+	drm_kms_helper_poll_fini(ddev);
+	return ret;
+}
+
+static const struct shmob_drm_config shmob_arm_config = {
+	.clk_source = SHMOB_DRM_CLK_BUS,
+	.clk_div = 5,
+};
+
+static const struct of_device_id shmob_drm_of_table[] __maybe_unused = {
+	{ .compatible = "renesas,r8a7740-lcdc",	.data = &shmob_arm_config, },
+	{ .compatible = "renesas,sh73a0-lcdc",	.data = &shmob_arm_config, },
+	{ /* sentinel */ }
+};
+
+static struct platform_driver shmob_drm_platform_driver = {
+	.probe		= shmob_drm_probe,
+	.remove		= shmob_drm_remove,
+	.shutdown	= shmob_drm_shutdown,
+	.driver		= {
+		.name	= "shmob-drm",
+		.of_match_table = of_match_ptr(shmob_drm_of_table),
+		.pm	= &shmob_drm_pm_ops,
+	},
+};
+
+drm_module_platform_driver(shmob_drm_platform_driver);
+
+MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
+MODULE_DESCRIPTION("Renesas SH Mobile DRM Driver");
+MODULE_LICENSE("GPL");