1/* mach64_irq.c -- IRQ handling for ATI Mach64 -*- linux-c -*- 2 * Created: Tue Feb 25, 2003 by Leif Delgass, based on radeon_irq.c/r128_irq.c 3 */ 4/*- 5 * Copyright (C) The Weather Channel, Inc. 2002. 6 * Copyright 2003 Leif Delgass 7 * All Rights Reserved. 8 * 9 * The Weather Channel (TM) funded Tungsten Graphics to develop the 10 * initial release of the Radeon 8500 driver under the XFree86 license. 11 * This notice must be preserved. 12 * 13 * Permission is hereby granted, free of charge, to any person obtaining a 14 * copy of this software and associated documentation files (the "Software"), 15 * to deal in the Software without restriction, including without limitation 16 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 17 * and/or sell copies of the Software, and to permit persons to whom the 18 * Software is furnished to do so, subject to the following conditions: 19 * 20 * The above copyright notice and this permission notice (including the next 21 * paragraph) shall be included in all copies or substantial portions of the 22 * Software. 23 * 24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 27 * THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 30 * DEALINGS IN THE SOFTWARE. 31 * 32 * Authors: 33 * Keith Whitwell <keith@tungstengraphics.com> 34 * Eric Anholt <anholt@FreeBSD.org> 35 * Leif Delgass <ldelgass@retinalburn.net> 36 */ 37 38#include <sys/cdefs.h> 39__FBSDID("$FreeBSD$"); 40 41#include "dev/drm/drmP.h" 42#include "dev/drm/drm.h" 43#include "dev/drm/mach64_drm.h" 44#include "dev/drm/mach64_drv.h" 45 46irqreturn_t mach64_driver_irq_handler(DRM_IRQ_ARGS) 47{ 48 struct drm_device *dev = arg; 49 drm_mach64_private_t *dev_priv = dev->dev_private; 50 int status; 51 52 status = MACH64_READ(MACH64_CRTC_INT_CNTL); 53 54 /* VBLANK interrupt */ 55 if (status & MACH64_CRTC_VBLANK_INT) { 56 /* Mask off all interrupt ack bits before setting the ack bit, since 57 * there may be other handlers outside the DRM. 58 * 59 * NOTE: On mach64, you need to keep the enable bits set when doing 60 * the ack, despite what the docs say about not acking and enabling 61 * in a single write. 62 */ 63 MACH64_WRITE(MACH64_CRTC_INT_CNTL, 64 (status & ~MACH64_CRTC_INT_ACKS) 65 | MACH64_CRTC_VBLANK_INT); 66 67 atomic_inc(&dev_priv->vbl_received); 68 drm_handle_vblank(dev, 0); 69 return IRQ_HANDLED; 70 } 71 return IRQ_NONE; 72} 73 74u32 mach64_get_vblank_counter(struct drm_device * dev, int crtc) 75{ 76 const drm_mach64_private_t *const dev_priv = dev->dev_private; 77 78 if (crtc != 0) 79 return 0; 80 81 return atomic_read(&dev_priv->vbl_received); 82} 83 84int mach64_enable_vblank(struct drm_device * dev, int crtc) 85{ 86 drm_mach64_private_t *dev_priv = dev->dev_private; 87 u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL); 88 89 if (crtc != 0) { 90 DRM_ERROR("tried to enable vblank on non-existent crtc %d\n", 91 crtc); 92 return -EINVAL; 93 } 94 95 DRM_DEBUG("before enable vblank CRTC_INT_CTNL: 0x%08x\n", status); 96 97 /* Turn on VBLANK interrupt */ 98 MACH64_WRITE(MACH64_CRTC_INT_CNTL, MACH64_READ(MACH64_CRTC_INT_CNTL) 99 | MACH64_CRTC_VBLANK_INT_EN); 100 101 return 0; 102} 103 104void mach64_disable_vblank(struct drm_device * dev, int crtc) 105{ 106 if (crtc != 0) { 107 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n", 108 crtc); 109 return; 110 } 111 112 /* 113 * FIXME: implement proper interrupt disable by using the vblank 114 * counter register (if available). 115 */ 116} 117 118static void mach64_disable_vblank_local(struct drm_device * dev, int crtc) 119{ 120 drm_mach64_private_t *dev_priv = dev->dev_private; 121 u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL); 122 123 if (crtc != 0) { 124 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n", 125 crtc); 126 return; 127 } 128 129 DRM_DEBUG("before disable vblank CRTC_INT_CTNL: 0x%08x\n", status); 130 131 /* Disable and clear VBLANK interrupt */ 132 MACH64_WRITE(MACH64_CRTC_INT_CNTL, (status & ~MACH64_CRTC_VBLANK_INT_EN) 133 | MACH64_CRTC_VBLANK_INT); 134} 135 136void mach64_driver_irq_preinstall(struct drm_device * dev) 137{ 138 drm_mach64_private_t *dev_priv = dev->dev_private; 139 140 u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL); 141 142 DRM_DEBUG("before install CRTC_INT_CTNL: 0x%08x\n", status); 143 144 mach64_disable_vblank_local(dev, 0); 145} 146 147int mach64_driver_irq_postinstall(struct drm_device * dev) 148{ 149 return 0; 150} 151 152void mach64_driver_irq_uninstall(struct drm_device * dev) 153{ 154 drm_mach64_private_t *dev_priv = dev->dev_private; 155 if (!dev_priv) 156 return; 157 158 mach64_disable_vblank_local(dev, 0); 159 160 DRM_DEBUG("after uninstall CRTC_INT_CTNL: 0x%08x\n", 161 MACH64_READ(MACH64_CRTC_INT_CNTL)); 162} 163