diff options
Diffstat (limited to 'shared/mach64_irq.c')
| -rw-r--r-- | shared/mach64_irq.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/shared/mach64_irq.c b/shared/mach64_irq.c new file mode 100644 index 00000000..9acd6269 --- /dev/null +++ b/shared/mach64_irq.c @@ -0,0 +1,130 @@ +/* mach64_irq.c -- IRQ handling for ATI Mach64 -*- linux-c -*- + * Created: Tue Feb 25, 2003 by Leif Delgass, based on radeon_irq.c/r128_irq.c + * + * Copyright (C) The Weather Channel, Inc. 2002. + * Copyright 2003 Leif Delgass + * 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 + * THE COPYRIGHT OWNER(S) 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> + * Leif Delgass <ldelgass@retinalburn.net> + */ + +#include "mach64.h" +#include "drmP.h" +#include "drm.h" +#include "mach64_drm.h" +#include "mach64_drv.h" + +irqreturn_t DRM(irq_handler)( DRM_IRQ_ARGS ) +{ + drm_device_t *dev = (drm_device_t *) arg; + drm_mach64_private_t *dev_priv = + (drm_mach64_private_t *)dev->dev_private; + int status; + + status = MACH64_READ( MACH64_CRTC_INT_CNTL ); + + /* VBLANK interrupt */ + if (status & MACH64_CRTC_VBLANK_INT) { + /* Mask off all interrupt ack bits before setting the ack bit, since + * there may be other handlers outside the DRM. + * + * NOTE: On mach64, you need to keep the enable bits set when doing + * the ack, despite what the docs say about not acking and enabling + * in a single write. + */ + MACH64_WRITE( MACH64_CRTC_INT_CNTL, (status & ~MACH64_CRTC_INT_ACKS) + | MACH64_CRTC_VBLANK_INT ); + + atomic_inc(&dev->vbl_received); + DRM_WAKEUP(&dev->vbl_queue); + DRM(vbl_send_signals)( dev ); + return IRQ_HANDLED; + } + return IRQ_NONE; +} + +int DRM(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; +} + +/* drm_dma.h hooks +*/ +void DRM(driver_irq_preinstall)( drm_device_t *dev ) { + drm_mach64_private_t *dev_priv = + (drm_mach64_private_t *)dev->dev_private; + + u32 status = MACH64_READ( MACH64_CRTC_INT_CNTL ); + + DRM_DEBUG("before install CRTC_INT_CTNL: 0x%08x\n", status ); + + /* Disable and clear VBLANK interrupt */ + MACH64_WRITE( MACH64_CRTC_INT_CNTL, (status & ~MACH64_CRTC_VBLANK_INT_EN) + | MACH64_CRTC_VBLANK_INT ); +} + +void DRM(driver_irq_postinstall)( drm_device_t *dev ) { + drm_mach64_private_t *dev_priv = + (drm_mach64_private_t *)dev->dev_private; + + /* Turn on VBLANK interrupt */ + MACH64_WRITE( MACH64_CRTC_INT_CNTL, MACH64_READ( MACH64_CRTC_INT_CNTL ) + | MACH64_CRTC_VBLANK_INT_EN ); + + DRM_DEBUG("after install CRTC_INT_CTNL: 0x%08x\n", MACH64_READ( MACH64_CRTC_INT_CNTL )); + +} + +void DRM(driver_irq_uninstall)( drm_device_t *dev ) { + drm_mach64_private_t *dev_priv = + (drm_mach64_private_t *)dev->dev_private; + if ( !dev_priv ) + return; + + /* Disable and clear VBLANK interrupt */ + MACH64_WRITE( MACH64_CRTC_INT_CNTL, + (MACH64_READ( MACH64_CRTC_INT_CNTL ) & ~MACH64_CRTC_VBLANK_INT_EN) + | MACH64_CRTC_VBLANK_INT ); + + DRM_DEBUG("after uninstall CRTC_INT_CTNL: 0x%08x\n", + MACH64_READ( MACH64_CRTC_INT_CNTL )); +} |