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/* radeon_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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* Michel D<EFBFBD>zer <michel@daenzer.net>
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*/
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#include "drmP.h"
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#include "drm.h"
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#include "radeon_drm.h"
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#include "radeon_drv.h"
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/* Interrupts - Used for device synchronization and flushing in the
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* following circumstances:
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*
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* - Exclusive FB access with hw idle:
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* - Wait for GUI Idle (?) interrupt, then do normal flush.
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*
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* - Frame throttling, NV_fence:
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* - Drop marker irq's into command stream ahead of time.
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* - Wait on irq's with lock *not held*
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* - Check each for termination condition
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*
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* - Internally in cp_getbuffer, etc:
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* - as above, but wait with lock held???
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*
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* NOTE: These functions are misleadingly named -- the irq's aren't
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* tied to dma at all, this is just a hangover from dri prehistory.
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*/
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irqreturn_t radeon_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_radeon_private_t *dev_priv =
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(drm_radeon_private_t *)dev->dev_private;
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u32 stat;
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/* Only consider the bits we're interested in - others could be used
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* outside the DRM
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*/
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stat = RADEON_READ(RADEON_GEN_INT_STATUS)
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& (RADEON_SW_INT_TEST | RADEON_CRTC_VBLANK_STAT);
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if (!stat)
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return IRQ_NONE;
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/* SW interrupt */
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if (stat & RADEON_SW_INT_TEST) {
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DRM_WAKEUP( &dev_priv->swi_queue );
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}
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/* VBLANK interrupt */
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if (stat & RADEON_CRTC_VBLANK_STAT) {
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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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}
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/* Acknowledge interrupts we handle */
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RADEON_WRITE(RADEON_GEN_INT_STATUS, stat);
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return IRQ_HANDLED;
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}
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static __inline__ void radeon_acknowledge_irqs(drm_radeon_private_t *dev_priv)
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{
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u32 tmp = RADEON_READ( RADEON_GEN_INT_STATUS )
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& (RADEON_SW_INT_TEST_ACK | RADEON_CRTC_VBLANK_STAT);
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if (tmp)
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RADEON_WRITE( RADEON_GEN_INT_STATUS, tmp );
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}
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static int radeon_emit_irq(drm_device_t *dev)
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{
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drm_radeon_private_t *dev_priv = dev->dev_private;
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unsigned int ret;
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RING_LOCALS;
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atomic_inc(&dev_priv->swi_emitted);
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ret = atomic_read(&dev_priv->swi_emitted);
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BEGIN_RING( 4 );
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OUT_RING_REG( RADEON_LAST_SWI_REG, ret );
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OUT_RING_REG( RADEON_GEN_INT_STATUS, RADEON_SW_INT_FIRE );
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ADVANCE_RING();
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COMMIT_RING();
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return ret;
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}
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static int radeon_wait_irq(drm_device_t *dev, int swi_nr)
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{
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drm_radeon_private_t *dev_priv =
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(drm_radeon_private_t *)dev->dev_private;
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int ret = 0;
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if (RADEON_READ( RADEON_LAST_SWI_REG ) >= swi_nr)
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return 0;
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dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
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DRM_WAIT_ON( ret, dev_priv->swi_queue, 3 * DRM_HZ,
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RADEON_READ( RADEON_LAST_SWI_REG ) >= swi_nr );
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return ret;
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}
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int radeon_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
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{
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drm_radeon_private_t *dev_priv =
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(drm_radeon_private_t *)dev->dev_private;
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unsigned int cur_vblank;
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int ret = 0;
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if ( !dev_priv ) {
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DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
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return DRM_ERR(EINVAL);
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}
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radeon_acknowledge_irqs( dev_priv );
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dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
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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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/* Needs the lock as it touches the ring.
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*/
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int radeon_irq_emit( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_radeon_private_t *dev_priv = dev->dev_private;
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drm_radeon_irq_emit_t emit;
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int result;
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LOCK_TEST_WITH_RETURN( dev, filp );
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if ( !dev_priv ) {
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DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
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return DRM_ERR(EINVAL);
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}
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DRM_COPY_FROM_USER_IOCTL( emit, (drm_radeon_irq_emit_t __user *)data,
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sizeof(emit) );
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result = radeon_emit_irq( dev );
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if ( DRM_COPY_TO_USER( emit.irq_seq, &result, sizeof(int) ) ) {
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DRM_ERROR( "copy_to_user\n" );
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return DRM_ERR(EFAULT);
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}
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return 0;
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}
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/* Doesn't need the hardware lock.
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*/
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int radeon_irq_wait( DRM_IOCTL_ARGS )
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{
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DRM_DEVICE;
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drm_radeon_private_t *dev_priv = dev->dev_private;
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drm_radeon_irq_wait_t irqwait;
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if ( !dev_priv ) {
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DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
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return DRM_ERR(EINVAL);
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}
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DRM_COPY_FROM_USER_IOCTL( irqwait, (drm_radeon_irq_wait_t __user*)data,
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sizeof(irqwait) );
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return radeon_wait_irq( dev, irqwait.irq_seq );
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}
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/* drm_dma.h hooks
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*/
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void radeon_driver_irq_preinstall( drm_device_t *dev ) {
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drm_radeon_private_t *dev_priv =
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(drm_radeon_private_t *)dev->dev_private;
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/* Disable *all* interrupts */
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RADEON_WRITE( RADEON_GEN_INT_CNTL, 0 );
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/* Clear bits if they're already high */
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radeon_acknowledge_irqs( dev_priv );
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}
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void radeon_driver_irq_postinstall( drm_device_t *dev ) {
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drm_radeon_private_t *dev_priv =
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(drm_radeon_private_t *)dev->dev_private;
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atomic_set(&dev_priv->swi_emitted, 0);
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DRM_INIT_WAITQUEUE( &dev_priv->swi_queue );
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/* Turn on SW and VBL ints */
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RADEON_WRITE( RADEON_GEN_INT_CNTL,
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RADEON_CRTC_VBLANK_MASK |
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RADEON_SW_INT_ENABLE );
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}
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void radeon_driver_irq_uninstall( drm_device_t *dev ) {
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drm_radeon_private_t *dev_priv =
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(drm_radeon_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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RADEON_WRITE( RADEON_GEN_INT_CNTL, 0 );
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}
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