mga_irq.c (4940B)
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 "mga_drv.h" 35 36u32 mga_get_vblank_counter(struct drm_device *dev, unsigned int pipe) 37{ 38 const drm_mga_private_t *const dev_priv = 39 (drm_mga_private_t *) dev->dev_private; 40 41 if (pipe != 0) 42 return 0; 43 44 return atomic_read(&dev_priv->vbl_received); 45} 46 47 48irqreturn_t mga_driver_irq_handler(int irq, void *arg) 49{ 50 struct drm_device *dev = (struct drm_device *) arg; 51 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 52 int status; 53 int handled = 0; 54 55 status = MGA_READ(MGA_STATUS); 56 57 /* VBLANK interrupt */ 58 if (status & MGA_VLINEPEN) { 59 MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR); 60 atomic_inc(&dev_priv->vbl_received); 61 drm_handle_vblank(dev, 0); 62 handled = 1; 63 } 64 65 /* SOFTRAP interrupt */ 66 if (status & MGA_SOFTRAPEN) { 67 const u32 prim_start = MGA_READ(MGA_PRIMADDRESS); 68 const u32 prim_end = MGA_READ(MGA_PRIMEND); 69 70 71 MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR); 72 73 /* In addition to clearing the interrupt-pending bit, we 74 * have to write to MGA_PRIMEND to re-start the DMA operation. 75 */ 76 if ((prim_start & ~0x03) != (prim_end & ~0x03)) 77 MGA_WRITE(MGA_PRIMEND, prim_end); 78 79 atomic_inc(&dev_priv->last_fence_retired); 80 wake_up(&dev_priv->fence_queue); 81 handled = 1; 82 } 83 84 if (handled) 85 return IRQ_HANDLED; 86 return IRQ_NONE; 87} 88 89int mga_enable_vblank(struct drm_device *dev, unsigned int pipe) 90{ 91 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 92 93 if (pipe != 0) { 94 DRM_ERROR("tried to enable vblank on non-existent crtc %u\n", 95 pipe); 96 return 0; 97 } 98 99 MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); 100 return 0; 101} 102 103 104void mga_disable_vblank(struct drm_device *dev, unsigned int pipe) 105{ 106 if (pipe != 0) { 107 DRM_ERROR("tried to disable vblank on non-existent crtc %u\n", 108 pipe); 109 } 110 111 /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have 112 * a nice hardware counter that tracks the number of refreshes when 113 * the interrupt is disabled, and the kernel doesn't know the refresh 114 * rate to calculate an estimate. 115 */ 116 /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */ 117} 118 119void mga_driver_fence_wait(struct drm_device *dev, unsigned int *sequence) 120{ 121 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 122 unsigned int cur_fence; 123 124 /* Assume that the user has missed the current sequence number 125 * by about a day rather than she wants to wait for years 126 * using fences. 127 */ 128 wait_event_timeout(dev_priv->fence_queue, 129 (((cur_fence = atomic_read(&dev_priv->last_fence_retired)) 130 - *sequence) <= (1 << 23)), 131 msecs_to_jiffies(3000)); 132 133 *sequence = cur_fence; 134} 135 136void mga_driver_irq_preinstall(struct drm_device *dev) 137{ 138 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 139 140 /* Disable *all* interrupts */ 141 MGA_WRITE(MGA_IEN, 0); 142 /* Clear bits if they're already high */ 143 MGA_WRITE(MGA_ICLEAR, ~0); 144} 145 146int mga_driver_irq_postinstall(struct drm_device *dev) 147{ 148 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 149 150 init_waitqueue_head(&dev_priv->fence_queue); 151 152 /* Turn on soft trap interrupt. Vertical blank interrupts are enabled 153 * in mga_enable_vblank. 154 */ 155 MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN); 156 return 0; 157} 158 159void mga_driver_irq_uninstall(struct drm_device *dev) 160{ 161 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private; 162 if (!dev_priv) 163 return; 164 165 /* Disable *all* interrupts */ 166 MGA_WRITE(MGA_IEN, 0); 167 168 dev->irq_enabled = false; 169}