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/* mga_irq.c -- IRQ handling for radeon -*- linux-c -*-
*
* Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
*
* The Weather Channel (TM) funded Tungsten Graphics to develop the
* initial release of the Radeon 8500 driver under the XFree86 license.
* This notice must be preserved.
*
* 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
* PRECISION INSIGHT 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.
*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
* Eric Anholt <anholt@FreeBSD.org>
*/
#include "drmP.h"
#include "drm.h"
#include "mga_drm.h"
#include "mga_drv.h"
irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS)
{
drm_device_t *dev = (drm_device_t *) arg;
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
int status;
status = MGA_READ(MGA_STATUS);
/* VBLANK interrupt */
if (status & MGA_VLINEPEN) {
MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR);
atomic_inc(&dev->vbl_received);
DRM_WAKEUP(&dev->vbl_queue);
drm_vbl_send_signals(dev);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
int mga_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence)
{
unsigned int cur_vblank;
int ret = 0;
/* Assume that the user has missed the current sequence number
* by about a day rather than she wants to wait for years
* using vertical blanks...
*/
DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
(((cur_vblank = atomic_read(&dev->vbl_received))
- *sequence) <= (1 << 23)));
*sequence = cur_vblank;
return ret;
}
void mga_driver_irq_preinstall(drm_device_t * dev)
{
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
/* Disable *all* interrupts */
MGA_WRITE(MGA_IEN, 0);
/* Clear bits if they're already high */
MGA_WRITE(MGA_ICLEAR, ~0);
}
void mga_driver_irq_postinstall(drm_device_t * dev)
{
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
/* Turn on VBL interrupt */
MGA_WRITE(MGA_IEN, MGA_VLINEIEN);
}
void mga_driver_irq_uninstall(drm_device_t * dev)
{
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
if (!dev_priv)
return;
/* Disable *all* interrupts */
MGA_WRITE(MGA_IEN, 0);
dev->irq_enabled = 0;
}
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