1 /* $NetBSD: r128_irq.c,v 1.2 2018/08/27 04:58:35 riastradh Exp $ */ 2 3 /* r128_irq.c -- IRQ handling for radeon -*- linux-c -*- */ 4 /* 5 * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved. 6 * 7 * The Weather Channel (TM) funded Tungsten Graphics to develop the 8 * initial release of the Radeon 8500 driver under the XFree86 license. 9 * This notice must be preserved. 10 * 11 * Permission is hereby granted, free of charge, to any person obtaining a 12 * copy of this software and associated documentation files (the "Software"), 13 * to deal in the Software without restriction, including without limitation 14 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 15 * and/or sell copies of the Software, and to permit persons to whom the 16 * Software is furnished to do so, subject to the following conditions: 17 * 18 * The above copyright notice and this permission notice (including the next 19 * paragraph) shall be included in all copies or substantial portions of the 20 * Software. 21 * 22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 25 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 28 * DEALINGS IN THE SOFTWARE. 29 * 30 * Authors: 31 * Keith Whitwell <keith@tungstengraphics.com> 32 * Eric Anholt <anholt@FreeBSD.org> 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: r128_irq.c,v 1.2 2018/08/27 04:58:35 riastradh Exp $"); 37 38 #include <drm/drmP.h> 39 #include <drm/r128_drm.h> 40 #include "r128_drv.h" 41 42 u32 r128_get_vblank_counter(struct drm_device *dev, unsigned int pipe) 43 { 44 const drm_r128_private_t *dev_priv = dev->dev_private; 45 46 if (pipe != 0) 47 return 0; 48 49 return atomic_read(&dev_priv->vbl_received); 50 } 51 52 irqreturn_t r128_driver_irq_handler(int irq, void *arg) 53 { 54 struct drm_device *dev = (struct drm_device *) arg; 55 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private; 56 int status; 57 58 status = R128_READ(R128_GEN_INT_STATUS); 59 60 /* VBLANK interrupt */ 61 if (status & R128_CRTC_VBLANK_INT) { 62 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK); 63 atomic_inc(&dev_priv->vbl_received); 64 drm_handle_vblank(dev, 0); 65 return IRQ_HANDLED; 66 } 67 return IRQ_NONE; 68 } 69 70 int r128_enable_vblank(struct drm_device *dev, unsigned int pipe) 71 { 72 drm_r128_private_t *dev_priv = dev->dev_private; 73 74 if (pipe != 0) { 75 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe); 76 return -EINVAL; 77 } 78 79 R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN); 80 return 0; 81 } 82 83 void r128_disable_vblank(struct drm_device *dev, unsigned int pipe) 84 { 85 if (pipe != 0) 86 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe); 87 88 /* 89 * FIXME: implement proper interrupt disable by using the vblank 90 * counter register (if available) 91 * 92 * R128_WRITE(R128_GEN_INT_CNTL, 93 * R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN); 94 */ 95 } 96 97 void r128_driver_irq_preinstall(struct drm_device *dev) 98 { 99 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private; 100 101 /* Disable *all* interrupts */ 102 R128_WRITE(R128_GEN_INT_CNTL, 0); 103 /* Clear vblank bit if it's already high */ 104 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK); 105 } 106 107 int r128_driver_irq_postinstall(struct drm_device *dev) 108 { 109 return 0; 110 } 111 112 void r128_driver_irq_uninstall(struct drm_device *dev) 113 { 114 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private; 115 if (!dev_priv) 116 return; 117 118 /* Disable *all* interrupts */ 119 R128_WRITE(R128_GEN_INT_CNTL, 0); 120 } 121