| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* mga_irq.c -- IRQ handling for radeon -*- linux-c -*- |
| 2 | * |
| 3 | * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved. |
| 4 | * |
| 5 | * The Weather Channel (TM) funded Tungsten Graphics to develop the |
| 6 | * initial release of the Radeon 8500 driver under the XFree86 license. |
| 7 | * This notice must be preserved. |
| 8 | * |
| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 10 | * copy of this software and associated documentation files (the "Software"), |
| 11 | * to deal in the Software without restriction, including without limitation |
| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
| 14 | * Software is furnished to do so, subject to the following conditions: |
| 15 | * |
| 16 | * The above copyright notice and this permission notice (including the next |
| 17 | * paragraph) shall be included in all copies or substantial portions of the |
| 18 | * Software. |
| 19 | * |
| 20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 23 | * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| 24 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| 25 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 26 | * DEALINGS IN THE SOFTWARE. |
| 27 | * |
| 28 | * Authors: |
| 29 | * Keith Whitwell <keith@tungstengraphics.com> |
| 30 | * Eric Anholt <anholt@FreeBSD.org> |
| 31 | */ |
| 32 | |
| 33 | #include "drmP.h" |
| 34 | #include "drm.h" |
| 35 | #include "mga_drm.h" |
| 36 | #include "mga_drv.h" |
| 37 | |
| 38 | irqreturn_t mga_driver_irq_handler( DRM_IRQ_ARGS ) |
| 39 | { |
| 40 | drm_device_t *dev = (drm_device_t *) arg; |
| 41 | drm_mga_private_t *dev_priv = |
| 42 | (drm_mga_private_t *)dev->dev_private; |
| 43 | int status; |
| 44 | |
| 45 | status = MGA_READ( MGA_STATUS ); |
| 46 | |
| 47 | /* VBLANK interrupt */ |
| 48 | if ( status & MGA_VLINEPEN ) { |
| 49 | MGA_WRITE( MGA_ICLEAR, MGA_VLINEICLR ); |
| 50 | atomic_inc(&dev->vbl_received); |
| 51 | DRM_WAKEUP(&dev->vbl_queue); |
| 52 | drm_vbl_send_signals( dev ); |
| 53 | return IRQ_HANDLED; |
| 54 | } |
| 55 | return IRQ_NONE; |
| 56 | } |
| 57 | |
| 58 | int mga_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence) |
| 59 | { |
| 60 | unsigned int cur_vblank; |
| 61 | int ret = 0; |
| 62 | |
| 63 | /* Assume that the user has missed the current sequence number |
| 64 | * by about a day rather than she wants to wait for years |
| 65 | * using vertical blanks... |
| 66 | */ |
| 67 | DRM_WAIT_ON( ret, dev->vbl_queue, 3*DRM_HZ, |
| 68 | ( ( ( cur_vblank = atomic_read(&dev->vbl_received ) ) |
| 69 | - *sequence ) <= (1<<23) ) ); |
| 70 | |
| 71 | *sequence = cur_vblank; |
| 72 | |
| 73 | return ret; |
| 74 | } |
| 75 | |
| 76 | void mga_driver_irq_preinstall( drm_device_t *dev ) { |
| 77 | drm_mga_private_t *dev_priv = |
| 78 | (drm_mga_private_t *)dev->dev_private; |
| 79 | |
| 80 | /* Disable *all* interrupts */ |
| 81 | MGA_WRITE( MGA_IEN, 0 ); |
| 82 | /* Clear bits if they're already high */ |
| 83 | MGA_WRITE( MGA_ICLEAR, ~0 ); |
| 84 | } |
| 85 | |
| 86 | void mga_driver_irq_postinstall( drm_device_t *dev ) { |
| 87 | drm_mga_private_t *dev_priv = |
| 88 | (drm_mga_private_t *)dev->dev_private; |
| 89 | |
| 90 | /* Turn on VBL interrupt */ |
| 91 | MGA_WRITE( MGA_IEN, MGA_VLINEIEN ); |
| 92 | } |
| 93 | |
| 94 | void mga_driver_irq_uninstall( drm_device_t *dev ) { |
| 95 | drm_mga_private_t *dev_priv = |
| 96 | (drm_mga_private_t *)dev->dev_private; |
| 97 | if (!dev_priv) |
| 98 | return; |
| 99 | |
| 100 | /* Disable *all* interrupts */ |
| 101 | MGA_WRITE( MGA_IEN, 0 ); |
| 102 | } |