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, 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 return atomic_read(&dev_priv->vbl_received); 48} 49 50 51irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS) 52{ 53 struct drm_device *dev = (struct drm_device *) arg; 54 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 55 int status; 56 int handled = 0; 57 58 status = MGA_READ(MGA_STATUS); 59 60 /* VBLANK interrupt */ 61 if (status & MGA_VLINEPEN) { 62 MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR); 63 atomic_inc(&dev_priv->vbl_received); 64 drm_handle_vblank(dev, 0); 65 handled = 1; 66 } 67 68 /* SOFTRAP interrupt */ 69 if (status & MGA_SOFTRAPEN) { 70 const u32 prim_start = MGA_READ(MGA_PRIMADDRESS); 71 const u32 prim_end = MGA_READ(MGA_PRIMEND); 72 73 74 MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR); 75 76 /* In addition to clearing the interrupt-pending bit, we 77 * have to write to MGA_PRIMEND to re-start the DMA operation. 78 */ 79 if ((prim_start & ~0x03) != (prim_end & ~0x03)) 80 MGA_WRITE(MGA_PRIMEND, prim_end); 81 82 atomic_inc(&dev_priv->last_fence_retired); 83 DRM_WAKEUP(&dev_priv->fence_queue); 84 handled = 1; 85 } 86 87 if (handled) 88 return IRQ_HANDLED; 89 return IRQ_NONE; 90} 91 92int mga_enable_vblank(struct drm_device *dev, int crtc) 93{ 94 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 95 96 if (crtc != 0) { 97 DRM_ERROR("tried to enable vblank on non-existent crtc %d\n", 98 crtc); 99 return 0; 100 } 101 102 MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); 103 return 0; 104} 105 106 107void mga_disable_vblank(struct drm_device *dev, int crtc) 108{ 109 if (crtc != 0) { 110 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n", 111 crtc); 112 } 113 114 /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have 115 * a nice hardware counter that tracks the number of refreshes when 116 * the interrupt is disabled, and the kernel doesn't know the refresh 117 * rate to calculate an estimate. 118 */ 119 /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */ 120} 121 122int mga_driver_fence_wait(struct drm_device *dev, unsigned int *sequence) 123{ 124 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 125 unsigned int cur_fence; 126 int ret = 0; 127 128 /* Assume that the user has missed the current sequence number 129 * by about a day rather than she wants to wait for years 130 * using fences. 131 */ 132 DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ, 133 (((cur_fence = atomic_read(&dev_priv->last_fence_retired)) 134 - *sequence) <= (1 << 23))); 135 136 *sequence = cur_fence; 137 138 return ret; 139} 140 141void mga_driver_irq_preinstall(struct drm_device *dev) 142{ 143 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 144 145 /* Disable *all* interrupts */ 146 MGA_WRITE(MGA_IEN, 0); 147 /* Clear bits if they're already high */ 148 MGA_WRITE(MGA_ICLEAR, ~0); 149} 150 151int mga_driver_irq_postinstall(struct drm_device *dev) 152{ 153 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 154 155 DRM_INIT_WAITQUEUE(&dev_priv->fence_queue); 156 157 /* Turn on soft trap interrupt. Vertical blank interrupts are enabled 158 * in mga_enable_vblank. 159 */ 160 MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN); 161 return 0; 162} 163 164void mga_driver_irq_uninstall(struct drm_device *dev) 165{ 166 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 167 if (!dev_priv) 168 return; 169 170 /* Disable *all* interrupts */ 171 MGA_WRITE(MGA_IEN, 0); 172 173 dev->irq_enabled = 0; 174} 175