1 files changed, 340 insertions, 0 deletions

diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c b/drivers/gpu/drm/mxsfb/lcdif_drv.c
new file mode 100644
index 000000000000..befad33dcb95
--- /dev/null
+++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
@@ -0,0 +1,340 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2022 Marek Vasut <marex@denx.de>
+ *
+ * This code is based on drivers/gpu/drm/mxsfb/mxsfb*
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_mode_config.h>
+#include <drm/drm_module.h>
+#include <drm/drm_of.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_vblank.h>
+
+#include "lcdif_drv.h"
+#include "lcdif_regs.h"
+
+static const struct drm_mode_config_funcs lcdif_mode_config_funcs = {
+	.fb_create		= drm_gem_fb_create,
+	.atomic_check		= drm_atomic_helper_check,
+	.atomic_commit		= drm_atomic_helper_commit,
+};
+
+static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = {
+	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
+};
+
+static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
+{
+	struct drm_device *drm = lcdif->drm;
+	struct drm_bridge *bridge;
+	struct drm_panel *panel;
+	int ret;
+
+	ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel,
+					  &bridge);
+	if (ret)
+		return ret;
+
+	if (panel) {
+		bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel,
+							 DRM_MODE_CONNECTOR_DPI);
+		if (IS_ERR(bridge))
+			return PTR_ERR(bridge);
+	}
+
+	if (!bridge)
+		return -ENODEV;
+
+	ret = drm_bridge_attach(&lcdif->encoder, bridge, NULL, 0);
+	if (ret)
+		return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n");
+
+	lcdif->bridge = bridge;
+
+	return 0;
+}
+
+static irqreturn_t lcdif_irq_handler(int irq, void *data)
+{
+	struct drm_device *drm = data;
+	struct lcdif_drm_private *lcdif = drm->dev_private;
+	u32 reg, stat;
+
+	stat = readl(lcdif->base + LCDC_V8_INT_STATUS_D0);
+	if (!stat)
+		return IRQ_NONE;
+
+	if (stat & INT_STATUS_D0_VS_BLANK) {
+		reg = readl(lcdif->base + LCDC_V8_CTRLDESCL0_5);
+		if (!(reg & CTRLDESCL0_5_SHADOW_LOAD_EN))
+			drm_crtc_handle_vblank(&lcdif->crtc);
+	}
+
+	writel(stat, lcdif->base + LCDC_V8_INT_STATUS_D0);
+
+	return IRQ_HANDLED;
+}
+
+static int lcdif_load(struct drm_device *drm)
+{
+	struct platform_device *pdev = to_platform_device(drm->dev);
+	struct lcdif_drm_private *lcdif;
+	struct resource *res;
+	int ret;
+
+	lcdif = devm_kzalloc(&pdev->dev, sizeof(*lcdif), GFP_KERNEL);
+	if (!lcdif)
+		return -ENOMEM;
+
+	lcdif->drm = drm;
+	drm->dev_private = lcdif;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	lcdif->base = devm_ioremap_resource(drm->dev, res);
+	if (IS_ERR(lcdif->base))
+		return PTR_ERR(lcdif->base);
+
+	lcdif->clk = devm_clk_get(drm->dev, "pix");
+	if (IS_ERR(lcdif->clk))
+		return PTR_ERR(lcdif->clk);
+
+	lcdif->clk_axi = devm_clk_get(drm->dev, "axi");
+	if (IS_ERR(lcdif->clk_axi))
+		return PTR_ERR(lcdif->clk_axi);
+
+	lcdif->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
+	if (IS_ERR(lcdif->clk_disp_axi))
+		return PTR_ERR(lcdif->clk_disp_axi);
+
+	platform_set_drvdata(pdev, drm);
+
+	ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(36));
+	if (ret)
+		return ret;
+
+	/* Modeset init */
+	drm_mode_config_init(drm);
+
+	ret = lcdif_kms_init(lcdif);
+	if (ret < 0) {
+		dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
+		return ret;
+	}
+
+	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+	if (ret < 0) {
+		dev_err(drm->dev, "Failed to initialise vblank\n");
+		return ret;
+	}
+
+	/* Start with vertical blanking interrupt reporting disabled. */
+	drm_crtc_vblank_off(&lcdif->crtc);
+
+	ret = lcdif_attach_bridge(lcdif);
+	if (ret)
+		return dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");
+
+	drm->mode_config.min_width	= LCDIF_MIN_XRES;
+	drm->mode_config.min_height	= LCDIF_MIN_YRES;
+	drm->mode_config.max_width	= LCDIF_MAX_XRES;
+	drm->mode_config.max_height	= LCDIF_MAX_YRES;
+	drm->mode_config.funcs		= &lcdif_mode_config_funcs;
+	drm->mode_config.helper_private	= &lcdif_mode_config_helpers;
+
+	drm_mode_config_reset(drm);
+
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
+	lcdif->irq = ret;
+
+	ret = devm_request_irq(drm->dev, lcdif->irq, lcdif_irq_handler, 0,
+			       drm->driver->name, drm);
+	if (ret < 0) {
+		dev_err(drm->dev, "Failed to install IRQ handler\n");
+		return ret;
+	}
+
+	drm_kms_helper_poll_init(drm);
+
+	drm_helper_hpd_irq_event(drm);
+
+	pm_runtime_enable(drm->dev);
+
+	return 0;
+}
+
+static void lcdif_unload(struct drm_device *drm)
+{
+	struct lcdif_drm_private *lcdif = drm->dev_private;
+
+	pm_runtime_get_sync(drm->dev);
+
+	drm_crtc_vblank_off(&lcdif->crtc);
+
+	drm_kms_helper_poll_fini(drm);
+	drm_mode_config_cleanup(drm);
+
+	pm_runtime_put_sync(drm->dev);
+	pm_runtime_disable(drm->dev);
+
+	drm->dev_private = NULL;
+}
+
+DEFINE_DRM_GEM_CMA_FOPS(fops);
+
+static const struct drm_driver lcdif_driver = {
+	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	DRM_GEM_CMA_DRIVER_OPS,
+	.fops	= &fops,
+	.name	= "imx-lcdif",
+	.desc	= "i.MX LCDIF Controller DRM",
+	.date	= "20220417",
+	.major	= 1,
+	.minor	= 0,
+};
+
+static const struct of_device_id lcdif_dt_ids[] = {
+	{ .compatible = "fsl,imx8mp-lcdif" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, lcdif_dt_ids);
+
+static int lcdif_probe(struct platform_device *pdev)
+{
+	struct drm_device *drm;
+	int ret;
+
+	drm = drm_dev_alloc(&lcdif_driver, &pdev->dev);
+	if (IS_ERR(drm))
+		return PTR_ERR(drm);
+
+	ret = lcdif_load(drm);
+	if (ret)
+		goto err_free;
+
+	ret = drm_dev_register(drm, 0);
+	if (ret)
+		goto err_unload;
+
+	drm_fbdev_generic_setup(drm, 32);
+
+	return 0;
+
+err_unload:
+	lcdif_unload(drm);
+err_free:
+	drm_dev_put(drm);
+
+	return ret;
+}
+
+static int lcdif_remove(struct platform_device *pdev)
+{
+	struct drm_device *drm = platform_get_drvdata(pdev);
+
+	drm_dev_unregister(drm);
+	drm_atomic_helper_shutdown(drm);
+	lcdif_unload(drm);
+	drm_dev_put(drm);
+
+	return 0;
+}
+
+static void lcdif_shutdown(struct platform_device *pdev)
+{
+	struct drm_device *drm = platform_get_drvdata(pdev);
+
+	drm_atomic_helper_shutdown(drm);
+}
+
+static int __maybe_unused lcdif_rpm_suspend(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+	struct lcdif_drm_private *lcdif = drm->dev_private;
+
+	/* These clock supply the DISPLAY CLOCK Domain */
+	clk_disable_unprepare(lcdif->clk);
+	/* These clock supply the System Bus, AXI, Write Path, LFIFO */
+	clk_disable_unprepare(lcdif->clk_disp_axi);
+	/* These clock supply the Control Bus, APB, APBH Ctrl Registers */
+	clk_disable_unprepare(lcdif->clk_axi);
+
+	return 0;
+}
+
+static int __maybe_unused lcdif_rpm_resume(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+	struct lcdif_drm_private *lcdif = drm->dev_private;
+
+	/* These clock supply the Control Bus, APB, APBH Ctrl Registers */
+	clk_prepare_enable(lcdif->clk_axi);
+	/* These clock supply the System Bus, AXI, Write Path, LFIFO */
+	clk_prepare_enable(lcdif->clk_disp_axi);
+	/* These clock supply the DISPLAY CLOCK Domain */
+	clk_prepare_enable(lcdif->clk);
+
+	return 0;
+}
+
+static int __maybe_unused lcdif_suspend(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+	int ret;
+
+	ret = drm_mode_config_helper_suspend(drm);
+	if (ret)
+		return ret;
+
+	return lcdif_rpm_suspend(dev);
+}
+
+static int __maybe_unused lcdif_resume(struct device *dev)
+{
+	struct drm_device *drm = dev_get_drvdata(dev);
+
+	lcdif_rpm_resume(dev);
+
+	return drm_mode_config_helper_resume(drm);
+}
+
+static const struct dev_pm_ops lcdif_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(lcdif_suspend, lcdif_resume)
+	SET_RUNTIME_PM_OPS(lcdif_rpm_suspend, lcdif_rpm_resume, NULL)
+};
+
+static struct platform_driver lcdif_platform_driver = {
+	.probe		= lcdif_probe,
+	.remove		= lcdif_remove,
+	.shutdown	= lcdif_shutdown,
+	.driver	= {
+		.name		= "imx-lcdif",
+		.of_match_table	= lcdif_dt_ids,
+		.pm		= &lcdif_pm_ops,
+	},
+};
+
+drm_module_platform_driver(lcdif_platform_driver);
+
+MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
+MODULE_DESCRIPTION("Freescale LCDIF DRM/KMS driver");
+MODULE_LICENSE("GPL");