drivers/gpu/drm/arc/arcpgu_drv.c - linux - Git at Google

 /*
  * ARC PGU DRM driver.
  *
  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
  *
  * 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 <linux/clk.h>
 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_fb_cma_helper.h>
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_atomic_helper.h>
 #include <linux/of_reserved_mem.h>

 #include "arcpgu.h"
 #include "arcpgu_regs.h"

 static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
 {
 	struct arcpgu_drm_private *arcpgu = dev->dev_private;

 	drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
 }

 static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
 	.fb_create  = drm_gem_fb_create,
 	.output_poll_changed = arcpgu_fb_output_poll_changed,
 	.atomic_check = drm_atomic_helper_check,
 	.atomic_commit = drm_atomic_helper_commit,
 };

 static void arcpgu_setup_mode_config(struct drm_device *drm)
 {
 	drm_mode_config_init(drm);
 	drm->mode_config.min_width = 0;
 	drm->mode_config.min_height = 0;
 	drm->mode_config.max_width = 1920;
 	drm->mode_config.max_height = 1080;
 	drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
 }

 DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);

 static void arcpgu_lastclose(struct drm_device *drm)
 {
 	struct arcpgu_drm_private *arcpgu = drm->dev_private;

 	drm_fbdev_cma_restore_mode(arcpgu->fbdev);
 }

 static int arcpgu_load(struct drm_device *drm)
 {
 	struct platform_device *pdev = to_platform_device(drm->dev);
 	struct arcpgu_drm_private *arcpgu;
 	struct device_node *encoder_node;
 	struct resource *res;
 	int ret;

 	arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
 	if (arcpgu == NULL)
 		return -ENOMEM;

 	drm->dev_private = arcpgu;

 	arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
 	if (IS_ERR(arcpgu->clk))
 		return PTR_ERR(arcpgu->clk);

 	arcpgu_setup_mode_config(drm);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(arcpgu->regs))
 		return PTR_ERR(arcpgu->regs);

 	dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
 		 arc_pgu_read(arcpgu, ARCPGU_REG_ID));

 	/* Get the optional framebuffer memory resource */
 	ret = of_reserved_mem_device_init(drm->dev);
 	if (ret && ret != -ENODEV)
 		return ret;

 	if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
 		return -ENODEV;

 	if (arc_pgu_setup_crtc(drm) < 0)
 		return -ENODEV;

 	/* find the encoder node and initialize it */
 	encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
 	if (encoder_node) {
 		ret = arcpgu_drm_hdmi_init(drm, encoder_node);
 		of_node_put(encoder_node);
 		if (ret < 0)
 			return ret;
 	} else {
 		ret = arcpgu_drm_sim_init(drm, NULL);
 		if (ret < 0)
 			return ret;
 	}

 	drm_mode_config_reset(drm);
 	drm_kms_helper_poll_init(drm);

 	arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
 					   drm->mode_config.num_connector);
 	if (IS_ERR(arcpgu->fbdev)) {
 		ret = PTR_ERR(arcpgu->fbdev);
 		arcpgu->fbdev = NULL;
 		return -ENODEV;
 	}

 	platform_set_drvdata(pdev, drm);
 	return 0;
 }

 static int arcpgu_unload(struct drm_device *drm)
 {
 	struct arcpgu_drm_private *arcpgu = drm->dev_private;

 	if (arcpgu->fbdev) {
 		drm_fbdev_cma_fini(arcpgu->fbdev);
 		arcpgu->fbdev = NULL;
 	}
 	drm_kms_helper_poll_fini(drm);
 	drm_mode_config_cleanup(drm);

 	return 0;
 }

 #ifdef CONFIG_DEBUG_FS
 static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
 {
 	struct drm_info_node *node = (struct drm_info_node *)m->private;
 	struct drm_device *drm = node->minor->dev;
 	struct arcpgu_drm_private *arcpgu = drm->dev_private;
 	unsigned long clkrate = clk_get_rate(arcpgu->clk);
 	unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;

 	seq_printf(m, "hw  : %lu\n", clkrate);
 	seq_printf(m, "mode: %lu\n", mode_clock);
 	return 0;
 }

 static struct drm_info_list arcpgu_debugfs_list[] = {
 	{ "clocks", arcpgu_show_pxlclock, 0 },
 };

 static int arcpgu_debugfs_init(struct drm_minor *minor)
 {
 	return drm_debugfs_create_files(arcpgu_debugfs_list,
 		ARRAY_SIZE(arcpgu_debugfs_list), minor->debugfs_root, minor);
 }
 #endif

 static struct drm_driver arcpgu_drm_driver = {
 	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 			   DRIVER_ATOMIC,
 	.lastclose = arcpgu_lastclose,
 	.name = "arcpgu",
 	.desc = "ARC PGU Controller",
 	.date = "20160219",
 	.major = 1,
 	.minor = 0,
 	.patchlevel = 0,
 	.fops = &arcpgu_drm_ops,
 	.dumb_create = drm_gem_cma_dumb_create,
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_free_object_unlocked = drm_gem_cma_free_object,
 	.gem_print_info = drm_gem_cma_print_info,
 	.gem_vm_ops = &drm_gem_cma_vm_ops,
 	.gem_prime_export = drm_gem_prime_export,
 	.gem_prime_import = drm_gem_prime_import,
 	.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,
 #ifdef CONFIG_DEBUG_FS
 	.debugfs_init = arcpgu_debugfs_init,
 #endif
 };

 static int arcpgu_probe(struct platform_device *pdev)
 {
 	struct drm_device *drm;
 	int ret;

 	drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
 	if (IS_ERR(drm))
 		return PTR_ERR(drm);

 	ret = arcpgu_load(drm);
 	if (ret)
 		goto err_unref;

 	ret = drm_dev_register(drm, 0);
 	if (ret)
 		goto err_unload;

 	return 0;

 err_unload:
 	arcpgu_unload(drm);

 err_unref:
 	drm_dev_unref(drm);

 	return ret;
 }

 static int arcpgu_remove(struct platform_device *pdev)
 {
 	struct drm_device *drm = platform_get_drvdata(pdev);

 	drm_dev_unregister(drm);
 	arcpgu_unload(drm);
 	drm_dev_unref(drm);

 	return 0;
 }

 static const struct of_device_id arcpgu_of_table[] = {
 	{.compatible = "snps,arcpgu"},
 	{}
 };

 MODULE_DEVICE_TABLE(of, arcpgu_of_table);

 static struct platform_driver arcpgu_platform_driver = {
 	.probe = arcpgu_probe,
 	.remove = arcpgu_remove,
 	.driver = {
 		   .name = "arcpgu",
 		   .of_match_table = arcpgu_of_table,
 		   },
 };

 module_platform_driver(arcpgu_platform_driver);

 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 MODULE_DESCRIPTION("ARC PGU DRM driver");
 MODULE_LICENSE("GPL");
	/*
	* ARC PGU DRM driver.
	*
	* Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
	*
	* 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 <linux/clk.h>
	#include <drm/drm_crtc_helper.h>
	#include <drm/drm_fb_cma_helper.h>
	#include <drm/drm_gem_cma_helper.h>
	#include <drm/drm_gem_framebuffer_helper.h>
	#include <drm/drm_atomic_helper.h>
	#include <linux/of_reserved_mem.h>

	#include "arcpgu.h"
	#include "arcpgu_regs.h"

	static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
	{
	struct arcpgu_drm_private *arcpgu = dev->dev_private;

	drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
	}

	static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
	.fb_create = drm_gem_fb_create,
	.output_poll_changed = arcpgu_fb_output_poll_changed,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
	};

	static void arcpgu_setup_mode_config(struct drm_device *drm)
	{
	drm_mode_config_init(drm);
	drm->mode_config.min_width = 0;
	drm->mode_config.min_height = 0;
	drm->mode_config.max_width = 1920;
	drm->mode_config.max_height = 1080;
	drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
	}

	DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);

	static void arcpgu_lastclose(struct drm_device *drm)
	{
	struct arcpgu_drm_private *arcpgu = drm->dev_private;

	drm_fbdev_cma_restore_mode(arcpgu->fbdev);
	}

	static int arcpgu_load(struct drm_device *drm)
	{
	struct platform_device *pdev = to_platform_device(drm->dev);
	struct arcpgu_drm_private *arcpgu;
	struct device_node *encoder_node;
	struct resource *res;
	int ret;

	arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
	if (arcpgu == NULL)
	return -ENOMEM;

	drm->dev_private = arcpgu;

	arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
	if (IS_ERR(arcpgu->clk))
	return PTR_ERR(arcpgu->clk);

	arcpgu_setup_mode_config(drm);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(arcpgu->regs))
	return PTR_ERR(arcpgu->regs);

	dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
	arc_pgu_read(arcpgu, ARCPGU_REG_ID));

	/* Get the optional framebuffer memory resource */
	ret = of_reserved_mem_device_init(drm->dev);
	if (ret && ret != -ENODEV)
	return ret;

	if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
	return -ENODEV;

	if (arc_pgu_setup_crtc(drm) < 0)
	return -ENODEV;

	/* find the encoder node and initialize it */
	encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
	if (encoder_node) {
	ret = arcpgu_drm_hdmi_init(drm, encoder_node);
	of_node_put(encoder_node);
	if (ret < 0)
	return ret;
	} else {
	ret = arcpgu_drm_sim_init(drm, NULL);
	if (ret < 0)
	return ret;
	}

	drm_mode_config_reset(drm);
	drm_kms_helper_poll_init(drm);

	arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
	drm->mode_config.num_connector);
	if (IS_ERR(arcpgu->fbdev)) {
	ret = PTR_ERR(arcpgu->fbdev);
	arcpgu->fbdev = NULL;
	return -ENODEV;
	}

	platform_set_drvdata(pdev, drm);
	return 0;
	}

	static int arcpgu_unload(struct drm_device *drm)
	{
	struct arcpgu_drm_private *arcpgu = drm->dev_private;

	if (arcpgu->fbdev) {
	drm_fbdev_cma_fini(arcpgu->fbdev);
	arcpgu->fbdev = NULL;
	}
	drm_kms_helper_poll_fini(drm);
	drm_mode_config_cleanup(drm);

	return 0;
	}

	#ifdef CONFIG_DEBUG_FS
	static int arcpgu_show_pxlclock(struct seq_file m, void arg)
	{
	struct drm_info_node node = (struct drm_info_node )m->private;
	struct drm_device *drm = node->minor->dev;
	struct arcpgu_drm_private *arcpgu = drm->dev_private;
	unsigned long clkrate = clk_get_rate(arcpgu->clk);
	unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;

	seq_printf(m, "hw : %lu\n", clkrate);
	seq_printf(m, "mode: %lu\n", mode_clock);
	return 0;
	}

	static struct drm_info_list arcpgu_debugfs_list[] = {
	{ "clocks", arcpgu_show_pxlclock, 0 },
	};

	static int arcpgu_debugfs_init(struct drm_minor *minor)
	{
	return drm_debugfs_create_files(arcpgu_debugfs_list,
	ARRAY_SIZE(arcpgu_debugfs_list), minor->debugfs_root, minor);
	}
	#endif

	static struct drm_driver arcpgu_drm_driver = {
	.driver_features = DRIVER_MODESET \| DRIVER_GEM \| DRIVER_PRIME \|
	DRIVER_ATOMIC,
	.lastclose = arcpgu_lastclose,
	.name = "arcpgu",
	.desc = "ARC PGU Controller",
	.date = "20160219",
	.major = 1,
	.minor = 0,
	.patchlevel = 0,
	.fops = &arcpgu_drm_ops,
	.dumb_create = drm_gem_cma_dumb_create,
	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
	.gem_free_object_unlocked = drm_gem_cma_free_object,
	.gem_print_info = drm_gem_cma_print_info,
	.gem_vm_ops = &drm_gem_cma_vm_ops,
	.gem_prime_export = drm_gem_prime_export,
	.gem_prime_import = drm_gem_prime_import,
	.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,
	#ifdef CONFIG_DEBUG_FS
	.debugfs_init = arcpgu_debugfs_init,
	#endif
	};

	static int arcpgu_probe(struct platform_device *pdev)
	{
	struct drm_device *drm;
	int ret;

	drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
	if (IS_ERR(drm))
	return PTR_ERR(drm);

	ret = arcpgu_load(drm);
	if (ret)
	goto err_unref;

	ret = drm_dev_register(drm, 0);
	if (ret)
	goto err_unload;

	return 0;

	err_unload:
	arcpgu_unload(drm);

	err_unref:
	drm_dev_unref(drm);

	return ret;
	}

	static int arcpgu_remove(struct platform_device *pdev)
	{
	struct drm_device *drm = platform_get_drvdata(pdev);

	drm_dev_unregister(drm);
	arcpgu_unload(drm);
	drm_dev_unref(drm);

	return 0;
	}

	static const struct of_device_id arcpgu_of_table[] = {
	{.compatible = "snps,arcpgu"},
	{}
	};

	MODULE_DEVICE_TABLE(of, arcpgu_of_table);

	static struct platform_driver arcpgu_platform_driver = {
	.probe = arcpgu_probe,
	.remove = arcpgu_remove,
	.driver = {
	.name = "arcpgu",
	.of_match_table = arcpgu_of_table,
	},
	};

	module_platform_driver(arcpgu_platform_driver);

	MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
	MODULE_DESCRIPTION("ARC PGU DRM driver");
	MODULE_LICENSE("GPL");