Orange Pi5 kernel

 /*
 * drm_irq.c IRQ and vblank support
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
 
/*
 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */
 
 
#include <linux/export.h>
#include <linux/interrupt.h>	/* For task queue support */
#include <linux/pci.h>
#include <linux/vgaarb.h>
 
#include <drm/drm.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_irq.h>
#include <drm/drm_print.h>
#include <drm/drm_vblank.h>
 
#include "drm_internal.h"
 
/**
 * DOC: irq helpers
 *
 * The DRM core provides very simple support helpers to enable IRQ handling on a
 * device through the drm_irq_install() and drm_irq_uninstall() functions. This
 * only supports devices with a single interrupt on the main device stored in
 * &drm_device.dev and set as the device paramter in drm_dev_alloc().
 *
 * These IRQ helpers are strictly optional. Drivers which roll their own only
 * need to set &drm_device.irq_enabled to signal the DRM core that vblank
 * interrupts are working. Since these helpers don't automatically clean up the
 * requested interrupt like e.g. devm_request_irq() they're not really
 * recommended.
 */
 
/**
 * drm_irq_install - install IRQ handler
 * @dev: DRM device
 * @irq: IRQ number to install the handler for
 *
 * Initializes the IRQ related data. Installs the handler, calling the driver
 * &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before
 * and after the installation.
 *
 * This is the simplified helper interface provided for drivers with no special
 * needs. Drivers which need to install interrupt handlers for multiple
 * interrupts must instead set &drm_device.irq_enabled to signal the DRM core
 * that vblank interrupts are available.
 *
 * @irq must match the interrupt number that would be passed to request_irq(),
 * if called directly instead of using this helper function.
 *
 * &drm_driver.irq_handler is called to handle the registered interrupt.
 *
 * Returns:
 * Zero on success or a negative error code on failure.
 */
int drm_irq_install(struct drm_device *dev, int irq)
{
<------>int ret;
<------>unsigned long sh_flags = 0;
 
<------>if (irq == 0)
<------><------>return -EINVAL;
 
<------>if (dev->irq_enabled)
<------><------>return -EBUSY;
<------>dev->irq_enabled = true;
 
<------>DRM_DEBUG("irq=%d\n", irq);
 
<------>/* Before installing handler */
<------>if (dev->driver->irq_preinstall)
<------><------>dev->driver->irq_preinstall(dev);
 
<------>/* PCI devices require shared interrupts. */
<------>if (dev->pdev)
<------><------>sh_flags = IRQF_SHARED;
 
<------>ret = request_irq(irq, dev->driver->irq_handler,
<------><------><------>  sh_flags, dev->driver->name, dev);
 
<------>if (ret < 0) {
<------><------>dev->irq_enabled = false;
<------><------>return ret;
<------>}
 
<------>/* After installing handler */
<------>if (dev->driver->irq_postinstall)
<------><------>ret = dev->driver->irq_postinstall(dev);
 
<------>if (ret < 0) {
<------><------>dev->irq_enabled = false;
<------><------>if (drm_core_check_feature(dev, DRIVER_LEGACY))
<------><------><------>vga_client_register(dev->pdev, NULL, NULL, NULL);
<------><------>free_irq(irq, dev);
<------>} else {
<------><------>dev->irq = irq;
<------>}
 
<------>return ret;
}
EXPORT_SYMBOL(drm_irq_install);
 
/**
 * drm_irq_uninstall - uninstall the IRQ handler
 * @dev: DRM device
 *
 * Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ
 * handler.  This should only be called by drivers which used drm_irq_install()
 * to set up their interrupt handler. Other drivers must only reset
 * &drm_device.irq_enabled to false.
 *
 * Note that for kernel modesetting drivers it is a bug if this function fails.
 * The sanity checks are only to catch buggy user modesetting drivers which call
 * the same function through an ioctl.
 *
 * Returns:
 * Zero on success or a negative error code on failure.
 */
int drm_irq_uninstall(struct drm_device *dev)
{
<------>unsigned long irqflags;
<------>bool irq_enabled;
<------>int i;
 
<------>irq_enabled = dev->irq_enabled;
<------>dev->irq_enabled = false;
 
<------>/*
<------> * Wake up any waiters so they don't hang. This is just to paper over
<------> * issues for UMS drivers which aren't in full control of their
<------> * vblank/irq handling. KMS drivers must ensure that vblanks are all
<------> * disabled when uninstalling the irq handler.
<------> */
<------>if (drm_dev_has_vblank(dev)) {
<------><------>spin_lock_irqsave(&dev->vbl_lock, irqflags);
<------><------>for (i = 0; i < dev->num_crtcs; i++) {
<------><------><------>struct drm_vblank_crtc *vblank = &dev->vblank[i];
 
<------><------><------>if (!vblank->enabled)
<------><------><------><------>continue;
 
<------><------><------>WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));
 
<------><------><------>drm_vblank_disable_and_save(dev, i);
<------><------><------>wake_up(&vblank->queue);
<------><------>}
<------><------>spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
<------>}
 
<------>if (!irq_enabled)
<------><------>return -EINVAL;
 
<------>DRM_DEBUG("irq=%d\n", dev->irq);
 
<------>if (drm_core_check_feature(dev, DRIVER_LEGACY))
<------><------>vga_client_register(dev->pdev, NULL, NULL, NULL);
 
<------>if (dev->driver->irq_uninstall)
<------><------>dev->driver->irq_uninstall(dev);
 
<------>free_irq(dev->irq, dev);
 
<------>return 0;
}
EXPORT_SYMBOL(drm_irq_uninstall);
 
#if IS_ENABLED(CONFIG_DRM_LEGACY)
int drm_legacy_irq_control(struct drm_device *dev, void *data,
<------><------><------>   struct drm_file *file_priv)
{
<------>struct drm_control *ctl = data;
<------>int ret = 0, irq;
 
<------>/* if we haven't irq we fallback for compatibility reasons -
<------> * this used to be a separate function in drm_dma.h
<------> */
 
<------>if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
<------><------>return 0;
<------>if (!drm_core_check_feature(dev, DRIVER_LEGACY))
<------><------>return 0;
<------>/* UMS was only ever supported on pci devices. */
<------>if (WARN_ON(!dev->pdev))
<------><------>return -EINVAL;
 
<------>switch (ctl->func) {
<------>case DRM_INST_HANDLER:
<------><------>irq = dev->pdev->irq;
 
<------><------>if (dev->if_version < DRM_IF_VERSION(1, 2) &&
<------><------>    ctl->irq != irq)
<------><------><------>return -EINVAL;
<------><------>mutex_lock(&dev->struct_mutex);
<------><------>ret = drm_irq_install(dev, irq);
<------><------>mutex_unlock(&dev->struct_mutex);
 
<------><------>return ret;
<------>case DRM_UNINST_HANDLER:
<------><------>mutex_lock(&dev->struct_mutex);
<------><------>ret = drm_irq_uninstall(dev);
<------><------>mutex_unlock(&dev->struct_mutex);
 
<------><------>return ret;
<------>default:
<------><------>return -EINVAL;
<------>}
}
#endif

	/*
	* drm_irq.c IRQ and vblank support
	*
	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	* \author Gareth Hughes <gareth@valinux.com>
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the next
	* paragraph) shall be included in all copies or substantial portions of the
	* Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*/

	/*
	* Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
	*
	* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	* All Rights Reserved.
	*
	* Permission is hereby granted, free of charge, to any person obtaining a
	* copy of this software and associated documentation files (the "Software"),
	* to deal in the Software without restriction, including without limitation
	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	* and/or sell copies of the Software, and to permit persons to whom the
	* Software is furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice (including the next
	* paragraph) shall be included in all copies or substantial portions of the
	* Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	* OTHER DEALINGS IN THE SOFTWARE.
	*/


	#include <linux/export.h>
	#include <linux/interrupt.h> /* For task queue support */
	#include <linux/pci.h>
	#include <linux/vgaarb.h>

	#include <drm/drm.h>
	#include <drm/drm_device.h>
	#include <drm/drm_drv.h>
	#include <drm/drm_irq.h>
	#include <drm/drm_print.h>
	#include <drm/drm_vblank.h>

	#include "drm_internal.h"

	/**
	* DOC: irq helpers
	*
	* The DRM core provides very simple support helpers to enable IRQ handling on a
	* device through the drm_irq_install() and drm_irq_uninstall() functions. This
	* only supports devices with a single interrupt on the main device stored in
	* &drm_device.dev and set as the device paramter in drm_dev_alloc().
	*
	* These IRQ helpers are strictly optional. Drivers which roll their own only
	* need to set &drm_device.irq_enabled to signal the DRM core that vblank
	* interrupts are working. Since these helpers don't automatically clean up the
	* requested interrupt like e.g. devm_request_irq() they're not really
	* recommended.
	*/

	/**
	* drm_irq_install - install IRQ handler
	* @dev: DRM device
	* @irq: IRQ number to install the handler for
	*
	* Initializes the IRQ related data. Installs the handler, calling the driver
	* &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before
	* and after the installation.
	*
	* This is the simplified helper interface provided for drivers with no special
	* needs. Drivers which need to install interrupt handlers for multiple
	* interrupts must instead set &drm_device.irq_enabled to signal the DRM core
	* that vblank interrupts are available.
	*
	* @irq must match the interrupt number that would be passed to request_irq(),
	* if called directly instead of using this helper function.
	*
	* &drm_driver.irq_handler is called to handle the registered interrupt.
	*
	* Returns:
	* Zero on success or a negative error code on failure.
	*/
	int drm_irq_install(struct drm_device *dev, int irq)
	{
	<------>int ret;
	<------>unsigned long sh_flags = 0;

	<------>if (irq == 0)
	<------><------>return -EINVAL;

	<------>if (dev->irq_enabled)
	<------><------>return -EBUSY;
	<------>dev->irq_enabled = true;

	<------>DRM_DEBUG("irq=%d\n", irq);

	<------>/* Before installing handler */
	<------>if (dev->driver->irq_preinstall)
	<------><------>dev->driver->irq_preinstall(dev);

	<------>/* PCI devices require shared interrupts. */
	<------>if (dev->pdev)
	<------><------>sh_flags = IRQF_SHARED;

	<------>ret = request_irq(irq, dev->driver->irq_handler,
	<------><------><------> sh_flags, dev->driver->name, dev);

	<------>if (ret < 0) {
	<------><------>dev->irq_enabled = false;
	<------><------>return ret;
	<------>}

	<------>/* After installing handler */
	<------>if (dev->driver->irq_postinstall)
	<------><------>ret = dev->driver->irq_postinstall(dev);

	<------>if (ret < 0) {
	<------><------>dev->irq_enabled = false;
	<------><------>if (drm_core_check_feature(dev, DRIVER_LEGACY))
	<------><------><------>vga_client_register(dev->pdev, NULL, NULL, NULL);
	<------><------>free_irq(irq, dev);
	<------>} else {
	<------><------>dev->irq = irq;
	<------>}

	<------>return ret;
	}
	EXPORT_SYMBOL(drm_irq_install);

	/**
	* drm_irq_uninstall - uninstall the IRQ handler
	* @dev: DRM device
	*
	* Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ
	* handler. This should only be called by drivers which used drm_irq_install()
	* to set up their interrupt handler. Other drivers must only reset
	* &drm_device.irq_enabled to false.
	*
	* Note that for kernel modesetting drivers it is a bug if this function fails.
	* The sanity checks are only to catch buggy user modesetting drivers which call
	* the same function through an ioctl.
	*
	* Returns:
	* Zero on success or a negative error code on failure.
	*/
	int drm_irq_uninstall(struct drm_device *dev)
	{
	<------>unsigned long irqflags;
	<------>bool irq_enabled;
	<------>int i;

	<------>irq_enabled = dev->irq_enabled;
	<------>dev->irq_enabled = false;

	<------>/*
	<------> * Wake up any waiters so they don't hang. This is just to paper over
	<------> * issues for UMS drivers which aren't in full control of their
	<------> * vblank/irq handling. KMS drivers must ensure that vblanks are all
	<------> * disabled when uninstalling the irq handler.
	<------> */
	<------>if (drm_dev_has_vblank(dev)) {
	<------><------>spin_lock_irqsave(&dev->vbl_lock, irqflags);
	<------><------>for (i = 0; i < dev->num_crtcs; i++) {
	<------><------><------>struct drm_vblank_crtc *vblank = &dev->vblank[i];

	<------><------><------>if (!vblank->enabled)
	<------><------><------><------>continue;

	<------><------><------>WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET));

	<------><------><------>drm_vblank_disable_and_save(dev, i);
	<------><------><------>wake_up(&vblank->queue);
	<------><------>}
	<------><------>spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
	<------>}

	<------>if (!irq_enabled)
	<------><------>return -EINVAL;

	<------>DRM_DEBUG("irq=%d\n", dev->irq);

	<------>if (drm_core_check_feature(dev, DRIVER_LEGACY))
	<------><------>vga_client_register(dev->pdev, NULL, NULL, NULL);

	<------>if (dev->driver->irq_uninstall)
	<------><------>dev->driver->irq_uninstall(dev);

	<------>free_irq(dev->irq, dev);

	<------>return 0;
	}
	EXPORT_SYMBOL(drm_irq_uninstall);

	#if IS_ENABLED(CONFIG_DRM_LEGACY)
	int drm_legacy_irq_control(struct drm_device dev, void data,
	<------><------><------> struct drm_file *file_priv)
	{
	<------>struct drm_control *ctl = data;
	<------>int ret = 0, irq;

	<------>/* if we haven't irq we fallback for compatibility reasons -
	<------> * this used to be a separate function in drm_dma.h
	<------> */

	<------>if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
	<------><------>return 0;
	<------>if (!drm_core_check_feature(dev, DRIVER_LEGACY))
	<------><------>return 0;
	<------>/* UMS was only ever supported on pci devices. */
	<------>if (WARN_ON(!dev->pdev))
	<------><------>return -EINVAL;

	<------>switch (ctl->func) {
	<------>case DRM_INST_HANDLER:
	<------><------>irq = dev->pdev->irq;

	<------><------>if (dev->if_version < DRM_IF_VERSION(1, 2) &&
	<------><------> ctl->irq != irq)
	<------><------><------>return -EINVAL;
	<------><------>mutex_lock(&dev->struct_mutex);
	<------><------>ret = drm_irq_install(dev, irq);
	<------><------>mutex_unlock(&dev->struct_mutex);

	<------><------>return ret;
	<------>case DRM_UNINST_HANDLER:
	<------><------>mutex_lock(&dev->struct_mutex);
	<------><------>ret = drm_irq_uninstall(dev);
	<------><------>mutex_unlock(&dev->struct_mutex);

	<------><------>return ret;
	<------>default:
	<------><------>return -EINVAL;
	<------>}
	}
	#endif