103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
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/* mga_irq.c -- IRQ handling for radeon -*- linux-c -*-
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*
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* Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
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*
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* The Weather Channel (TM) funded Tungsten Graphics to develop the
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* initial release of the Radeon 8500 driver under the XFree86 license.
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* This notice must be preserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Keith Whitwell <keith@tungstengraphics.com>
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* Eric Anholt <anholt@FreeBSD.org>
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*/
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#include "drmP.h"
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#include "drm.h"
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#include "mga_drm.h"
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#include "mga_drv.h"
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irqreturn_t mga_driver_irq_handler( DRM_IRQ_ARGS )
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{
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drm_device_t *dev = (drm_device_t *) arg;
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drm_mga_private_t *dev_priv =
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(drm_mga_private_t *)dev->dev_private;
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int status;
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status = MGA_READ( MGA_STATUS );
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/* VBLANK interrupt */
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if ( status & MGA_VLINEPEN ) {
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MGA_WRITE( MGA_ICLEAR, MGA_VLINEICLR );
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atomic_inc(&dev->vbl_received);
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DRM_WAKEUP(&dev->vbl_queue);
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drm_vbl_send_signals( dev );
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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int mga_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
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{
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unsigned int cur_vblank;
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int ret = 0;
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/* Assume that the user has missed the current sequence number
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* by about a day rather than she wants to wait for years
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* using vertical blanks...
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*/
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DRM_WAIT_ON( ret, dev->vbl_queue, 3*DRM_HZ,
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( ( ( cur_vblank = atomic_read(&dev->vbl_received ) )
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- *sequence ) <= (1<<23) ) );
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*sequence = cur_vblank;
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return ret;
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}
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void mga_driver_irq_preinstall( drm_device_t *dev ) {
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drm_mga_private_t *dev_priv =
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(drm_mga_private_t *)dev->dev_private;
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/* Disable *all* interrupts */
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MGA_WRITE( MGA_IEN, 0 );
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/* Clear bits if they're already high */
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MGA_WRITE( MGA_ICLEAR, ~0 );
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}
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void mga_driver_irq_postinstall( drm_device_t *dev ) {
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drm_mga_private_t *dev_priv =
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(drm_mga_private_t *)dev->dev_private;
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/* Turn on VBL interrupt */
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MGA_WRITE( MGA_IEN, MGA_VLINEIEN );
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}
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void mga_driver_irq_uninstall( drm_device_t *dev ) {
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drm_mga_private_t *dev_priv =
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(drm_mga_private_t *)dev->dev_private;
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if (!dev_priv)
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return;
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/* Disable *all* interrupts */
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MGA_WRITE( MGA_IEN, 0 );
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}
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