text: /*
   * rcar_du_drv.c  --  R-Car Display Unit DRM driver
   *
   * Copyright (C) 2013-2014 Renesas Electronics Corporation
   *
   * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   */
  
  #include <linux/clk.h>
  #include <linux/io.h>
  #include <linux/mm.h>
  #include <linux/module.h>
  #include <linux/of_device.h>
  #include <linux/platform_device.h>
  #include <linux/pm.h>
  #include <linux/slab.h>
  #include <linux/wait.h>
  
  #include <drm/drmP.h>
  #include <drm/drm_crtc_helper.h>
  #include <drm/drm_fb_cma_helper.h>
  #include <drm/drm_gem_cma_helper.h>
  
  #include "rcar_du_crtc.h"
  #include "rcar_du_drv.h"
  #include "rcar_du_kms.h"
  #include "rcar_du_regs.h"
  
  /* -----------------------------------------------------------------------------
   * Device Information
   */
  
  static const struct rcar_du_device_info rcar_du_r8a7779_info = {
  	.features = 0,
  	.num_crtcs = 2,
  	.routes = {
  		/* R8A7779 has two RGB outputs and one (currently unsupported)
  		 * TCON output.
  		 */
  		[RCAR_DU_OUTPUT_DPAD0] = {
  			.possible_crtcs = BIT(0),
  			.encoder_type = DRM_MODE_ENCODER_NONE,
  			.port = 0,
  		},
  		[RCAR_DU_OUTPUT_DPAD1] = {
  			.possible_crtcs = BIT(1) | BIT(0),
  			.encoder_type = DRM_MODE_ENCODER_NONE,
  			.port = 1,
  		},
  	},
  	.num_lvds = 0,
  };
  
  static const struct rcar_du_device_info rcar_du_r8a7790_info = {
  	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
  		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
  	.quirks = RCAR_DU_QUIRK_ALIGN_128B | RCAR_DU_QUIRK_LVDS_LANES,
  	.num_crtcs = 3,
  	.routes = {
  		/* R8A7790 has one RGB output, two LVDS outputs and one
  		 * (currently unsupported) TCON output.
  		 */
  		[RCAR_DU_OUTPUT_DPAD0] = {
  			.possible_crtcs = BIT(2) | BIT(1) | BIT(0),
  			.encoder_type = DRM_MODE_ENCODER_NONE,
  			.port = 0,
  		},
  		[RCAR_DU_OUTPUT_LVDS0] = {
  			.possible_crtcs = BIT(0),
  			.encoder_type = DRM_MODE_ENCODER_LVDS,
  			.port = 1,
  		},
  		[RCAR_DU_OUTPUT_LVDS1] = {
  			.possible_crtcs = BIT(2) | BIT(1),
  			.encoder_type = DRM_MODE_ENCODER_LVDS,
  			.port = 2,
  		},
  	},
  	.num_lvds = 2,
  };
  
  static const struct rcar_du_device_info rcar_du_r8a7791_info = {
  	.features = RCAR_DU_FEATURE_CRTC_IRQ_CLOCK
  		  | RCAR_DU_FEATURE_EXT_CTRL_REGS,
  	.num_crtcs = 2,
  	.routes = {
  		/* R8A7791 has one RGB output, one LVDS output and one
  		 * (currently unsupported) TCON output.
  		 */
  		[RCAR_DU_OUTPUT_DPAD0] = {
  			.possible_crtcs = BIT(1),
  			.encoder_type = DRM_MODE_ENCODER_NONE,
  			.port = 0,
  		},
  		[RCAR_DU_OUTPUT_LVDS0] = {
  			.possible_crtcs = BIT(0),
  			.encoder_type = DRM_MODE_ENCODER_LVDS,
  			.port = 1,
  		},
  	},
  	.num_lvds = 1,
  };
  
  static const struct platform_device_id rcar_du_id_table[] = {
  	{ "rcar-du-r8a7779", (kernel_ulong_t)&rcar_du_r8a7779_info },
  	{ "rcar-du-r8a7790", (kernel_ulong_t)&rcar_du_r8a7790_info },
  	{ "rcar-du-r8a7791", (kernel_ulong_t)&rcar_du_r8a7791_info },
  	{ }
  };
  
  MODULE_DEVICE_TABLE(platform, rcar_du_id_table);
  
  static const struct of_device_id rcar_du_of_table[] = {
  	{ .compatible = "renesas,du-r8a7779", .data = &rcar_du_r8a7779_info },
  	{ .compatible = "renesas,du-r8a7790", .data = &rcar_du_r8a7790_info },
  	{ .compatible = "renesas,du-r8a7791", .data = &rcar_du_r8a7791_info },
  	{ }
  };
  
  MODULE_DEVICE_TABLE(of, rcar_du_of_table);
  
  /* -----------------------------------------------------------------------------
   * DRM operations
   */
  
  static int rcar_du_unload(struct drm_device *dev)
  {
  	struct rcar_du_device *rcdu = dev->dev_private;
  
  	if (rcdu->fbdev)
  		drm_fbdev_cma_fini(rcdu->fbdev);
  
  	drm_kms_helper_poll_fini(dev);
  	drm_mode_config_cleanup(dev);
  	drm_vblank_cleanup(dev);
  
  	dev->irq_enabled = 0;
  	dev->dev_private = NULL;
  
  	return 0;
  }
  
  static int rcar_du_load(struct drm_device *dev, unsigned long flags)
  {
  	struct platform_device *pdev = dev->platformdev;
  	struct device_node *np = pdev->dev.of_node;
  	struct rcar_du_device *rcdu;
  	struct resource *mem;
  	int ret;
  
  	if (np == NULL) {
  		dev_err(dev->dev, "no platform data\n");
  		return -ENODEV;
  	}
  
  	rcdu = devm_kzalloc(&pdev->dev, sizeof(*rcdu), GFP_KERNEL);
  	if (rcdu == NULL) {
  		dev_err(dev->dev, "failed to allocate private data\n");
  		return -ENOMEM;
  	}
  
  	init_waitqueue_head(&rcdu->commit.wait);
  
  	rcdu->dev = &pdev->dev;
  	rcdu->info = np ? of_match_device(rcar_du_of_table, rcdu->dev)->data
  		   : (void *)platform_get_device_id(pdev)->driver_data;
  	rcdu->ddev = dev;
  	dev->dev_private = rcdu;
  
  	/* I/O resources */
  	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	rcdu->mmio = devm_ioremap_resource(&pdev->dev, mem);
  	if (IS_ERR(rcdu->mmio))
  		return PTR_ERR(rcdu->mmio);
  
  	/* Initialize vertical blanking interrupts handling. Start with vblank
  	 * disabled for all CRTCs.
  	 */
  	ret = drm_vblank_init(dev, (1 << rcdu->info->num_crtcs) - 1);
  	if (ret < 0) {
  		dev_err(&pdev->dev, "failed to initialize vblank\n");
  		goto done;
  	}
  
  	/* DRM/KMS objects */
  	ret = rcar_du_modeset_init(rcdu);
  	if (ret < 0) {
  		dev_err(&pdev->dev, "failed to initialize DRM/KMS (%d)\n", ret);
  		goto done;
  	}
  
  	dev->irq_enabled = 1;
  
  	platform_set_drvdata(pdev, rcdu);
  
  done:
  	if (ret)
  		rcar_du_unload(dev);
  
  	return ret;
  }
  
  static void rcar_du_preclose(struct drm_device *dev, struct drm_file *file)
  {
  	struct rcar_du_device *rcdu = dev->dev_private;
  	unsigned int i;
  
  	for (i = 0; i < rcdu->num_crtcs; ++i)
  		rcar_du_crtc_cancel_page_flip(&rcdu->crtcs[i], file);
  }
  
  static void rcar_du_lastclose(struct drm_device *dev)
  {
  	struct rcar_du_device *rcdu = dev->dev_private;
  
  	drm_fbdev_cma_restore_mode(rcdu->fbdev);
  }
  
  static int rcar_du_enable_vblank(struct drm_device *dev, int crtc)
  {
  	struct rcar_du_device *rcdu = dev->dev_private;
  
  	rcar_du_crtc_enable_vblank(&rcdu->crtcs[crtc], true);
  
  	return 0;
  }
  
  static void rcar_du_disable_vblank(struct drm_device *dev, int crtc)
  {
  	struct rcar_du_device *rcdu = dev->dev_private;
  
  	rcar_du_crtc_enable_vblank(&rcdu->crtcs[crtc], false);
  }
  
  static const struct file_operations rcar_du_fops = {
  	.owner		= THIS_MODULE,
  	.open		= drm_open,
  	.release	= drm_release,
  	.unlocked_ioctl	= drm_ioctl,
  #ifdef CONFIG_COMPAT
  	.compat_ioctl	= drm_compat_ioctl,
  #endif
  	.poll		= drm_poll,
  	.read		= drm_read,
  	.llseek		= no_llseek,
  	.mmap		= drm_gem_cma_mmap,
  };
  
  static struct drm_driver rcar_du_driver = {
  	.driver_features	= DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME
  				| DRIVER_ATOMIC,
  	.load			= rcar_du_load,
  	.unload			= rcar_du_unload,
  	.preclose		= rcar_du_preclose,
  	.lastclose		= rcar_du_lastclose,
  	.set_busid		= drm_platform_set_busid,
  	.get_vblank_counter	= drm_vblank_count,
  	.enable_vblank		= rcar_du_enable_vblank,
  	.disable_vblank		= rcar_du_disable_vblank,
  	.gem_free_object	= drm_gem_cma_free_object,
  	.gem_vm_ops		= &drm_gem_cma_vm_ops,
  	.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
  	.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
  	.gem_prime_import	= drm_gem_prime_import,
  	.gem_prime_export	= drm_gem_prime_export,
  	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
  	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  	.gem_prime_vmap		= drm_gem_cma_prime_vmap,
  	.gem_prime_vunmap	= drm_gem_cma_prime_vunmap,
  	.gem_prime_mmap		= drm_gem_cma_prime_mmap,
  	.dumb_create		= rcar_du_dumb_create,
  	.dumb_map_offset	= drm_gem_cma_dumb_map_offset,
  	.dumb_destroy		= drm_gem_dumb_destroy,
  	.fops			= &rcar_du_fops,
  	.name			= "rcar-du",
  	.desc			= "Renesas R-Car Display Unit",
  	.date			= "20130110",
  	.major			= 1,
  	.minor			= 0,
  };
  
  /* -----------------------------------------------------------------------------
   * Power management
   */
  
  #ifdef CONFIG_PM_SLEEP
  static int rcar_du_pm_suspend(struct device *dev)
  {
  	struct rcar_du_device *rcdu = dev_get_drvdata(dev);
  
  	drm_kms_helper_poll_disable(rcdu->ddev);
  	/* TODO Suspend the CRTC */
  
  	return 0;
  }
  
  static int rcar_du_pm_resume(struct device *dev)
  {
  	struct rcar_du_device *rcdu = dev_get_drvdata(dev);
  
  	/* TODO Resume the CRTC */
  
  	drm_kms_helper_poll_enable(rcdu->ddev);
  	return 0;
  }
  #endif
  
  static const struct dev_pm_ops rcar_du_pm_ops = {
  	SET_SYSTEM_SLEEP_PM_OPS(rcar_du_pm_suspend, rcar_du_pm_resume)
  };
  
  /* -----------------------------------------------------------------------------
   * Platform driver
   */
  
  static int rcar_du_probe(struct platform_device *pdev)
  {
  	return drm_platform_init(&rcar_du_driver, pdev);
  }
  
  static int rcar_du_remove(struct platform_device *pdev)
  {
  	struct rcar_du_device *rcdu = platform_get_drvdata(pdev);
  
  	drm_put_dev(rcdu->ddev);
  
  	return 0;
  }
  
  static struct platform_driver rcar_du_platform_driver = {
  	.probe		= rcar_du_probe,
  	.remove		= rcar_du_remove,
  	.driver		= {
  		.name	= "rcar-du",
  		.pm	= &rcar_du_pm_ops,
  		.of_match_table = rcar_du_of_table,
  	},
  	.id_table	= rcar_du_id_table,
  };
  
  module_platform_driver(rcar_du_platform_driver);
  
  MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
  MODULE_DESCRIPTION("Renesas R-Car Display Unit DRM Driver");
  MODULE_LICENSE("GPL");
  