1/* mga_irq.c -- IRQ handling for radeon -*- linux-c -*- 2 */ 3/* 4 * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved. 5 * 6 * The Weather Channel (TM) funded Tungsten Graphics to develop the 7 * initial release of the Radeon 8500 driver under the XFree86 license. 8 * This notice must be preserved. 9 * 10 * Permission is hereby granted, free of charge, to any person obtaining a 11 * copy of this software and associated documentation files (the "Software"), 12 * to deal in the Software without restriction, including without limitation 13 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 14 * and/or sell copies of the Software, and to permit persons to whom the 15 * Software is furnished to do so, subject to the following conditions: 16 * 17 * The above copyright notice and this permission notice (including the next 18 * paragraph) shall be included in all copies or substantial portions of the 19 * Software. 20 * 21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 24 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 25 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 26 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 27 * DEALINGS IN THE SOFTWARE. 28 * 29 * Authors: 30 * Keith Whitwell <keith@tungstengraphics.com> 31 * Eric Anholt <anholt@FreeBSD.org> 32 */ 33 34#include "drmP.h" 35#include "drm.h" 36#include "mga_drm.h" 37#include "mga_drv.h" 38 39u32 mga_get_vblank_counter(struct drm_device *dev, unsigned int crtc) 40{ 41 const drm_mga_private_t *const dev_priv = 42 (drm_mga_private_t *) dev->dev_private; 43 44 if (crtc != 0) { 45 return 0; 46 } 47 48 49 return atomic_read(&dev_priv->vbl_received); 50} 51 52 53irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS) 54{ 55 struct drm_device *dev = (struct drm_device *) arg; 56 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 57 int status; 58 int handled = 0; 59 60 status = MGA_READ(MGA_STATUS); 61 62 /* VBLANK interrupt */ 63 if (status & MGA_VLINEPEN) { 64 MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR); 65 atomic_inc(&dev_priv->vbl_received); 66 drm_handle_vblank(dev, 0); 67 handled = 1; 68 } 69 70 /* SOFTRAP interrupt */ 71 if (status & MGA_SOFTRAPEN) { 72 const u32 prim_start = MGA_READ(MGA_PRIMADDRESS); 73 const u32 prim_end = MGA_READ(MGA_PRIMEND); 74 75 76 MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR); 77 78 /* In addition to clearing the interrupt-pending bit, we 79 * have to write to MGA_PRIMEND to re-start the DMA operation. 80 */ 81 if ((prim_start & ~0x03) != (prim_end & ~0x03)) { 82 MGA_WRITE(MGA_PRIMEND, prim_end); 83 } 84 85 atomic_inc(&dev_priv->last_fence_retired); 86 DRM_WAKEUP(&dev_priv->fence_queue); 87 handled = 1; 88 } 89 90 if (handled) 91 return IRQ_HANDLED; 92 return IRQ_NONE; 93} 94 95int mga_enable_vblank(struct drm_device *dev, unsigned int crtc) 96{ 97 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 98 99 if (crtc != 0) { 100 DRM_ERROR("tried to enable vblank on non-existent crtc %d\n", 101 crtc); 102 return 0; 103 } 104 105 MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); 106 return 0; 107} 108 109 110void mga_disable_vblank(struct drm_device *dev, unsigned int crtc) 111{ 112 if (crtc != 0) { 113 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n", 114 crtc); 115 } 116 117 /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have 118 * a nice hardware counter that tracks the number of refreshes when 119 * the interrupt is disabled, and the kernel doesn't know the refresh 120 * rate to calculate an estimate. 121 */ 122 /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */ 123} 124 125int mga_driver_fence_wait(struct drm_device * dev, unsigned int *sequence) 126{ 127 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 128 unsigned int cur_fence; 129 int ret = 0; 130 131 /* Assume that the user has missed the current sequence number 132 * by about a day rather than she wants to wait for years 133 * using fences. 134 */ 135 DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ, 136 (((cur_fence = atomic_read(&dev_priv->last_fence_retired)) 137 - *sequence) <= (1 << 23))); 138 139 *sequence = cur_fence; 140 141 return ret; 142} 143 144void mga_driver_irq_preinstall(struct drm_device * dev) 145{ 146 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 147 148 /* Disable *all* interrupts */ 149 MGA_WRITE(MGA_IEN, 0); 150 /* Clear bits if they're already high */ 151 MGA_WRITE(MGA_ICLEAR, ~0); 152} 153 154int mga_driver_irq_postinstall(struct drm_device * dev) 155{ 156 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 157 158 DRM_INIT_WAITQUEUE(&dev_priv->fence_queue); 159 160 /* Turn on soft trap interrupt. Vertical blank interrupts are enabled 161 * in mga_enable_vblank. 162 */ 163 MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN); 164 return 0; 165} 166 167void mga_driver_irq_uninstall(struct drm_device * dev) 168{ 169 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 170 if (!dev_priv) 171 return; 172 173 /* Disable *all* interrupts */ 174 MGA_WRITE(MGA_IEN, 0); 175 176 dev->irq_enabled = 0; 177} 178