1 /* $NetBSD: r128_irq.c,v 1.3 2021/12/18 23:45:42 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 1.3 2021/12/18 23:45:42 riastradh Exp $"); 37 38 #include <drm/drm_device.h> 39 #include <drm/drm_print.h> 40 #include <drm/drm_vblank.h> 41 #include <drm/r128_drm.h> 42 43 #include "r128_drv.h" 44 45 u32 r128_get_vblank_counter(struct drm_device *dev, unsigned int pipe) 46 { 47 const drm_r128_private_t *dev_priv = dev->dev_private; 48 49 if (pipe != 0) 50 return 0; 51 52 return atomic_read(&dev_priv->vbl_received); 53 } 54 55 irqreturn_t r128_driver_irq_handler(int irq, void *arg) 56 { 57 struct drm_device *dev = (struct drm_device *) arg; 58 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private; 59 int status; 60 61 status = R128_READ(R128_GEN_INT_STATUS); 62 63 /* VBLANK interrupt */ 64 if (status & R128_CRTC_VBLANK_INT) { 65 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK); 66 atomic_inc(&dev_priv->vbl_received); 67 drm_handle_vblank(dev, 0); 68 return IRQ_HANDLED; 69 } 70 return IRQ_NONE; 71 } 72 73 int r128_enable_vblank(struct drm_device *dev, unsigned int pipe) 74 { 75 drm_r128_private_t *dev_priv = dev->dev_private; 76 77 if (pipe != 0) { 78 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe); 79 return -EINVAL; 80 } 81 82 R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN); 83 return 0; 84 } 85 86 void r128_disable_vblank(struct drm_device *dev, unsigned int pipe) 87 { 88 if (pipe != 0) 89 DRM_ERROR("%s: bad crtc %u\n", __func__, pipe); 90 91 /* 92 * FIXME: implement proper interrupt disable by using the vblank 93 * counter register (if available) 94 * 95 * R128_WRITE(R128_GEN_INT_CNTL, 96 * R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN); 97 */ 98 } 99 100 void r128_driver_irq_preinstall(struct drm_device *dev) 101 { 102 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private; 103 104 /* Disable *all* interrupts */ 105 R128_WRITE(R128_GEN_INT_CNTL, 0); 106 /* Clear vblank bit if it's already high */ 107 R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK); 108 } 109 110 int r128_driver_irq_postinstall(struct drm_device *dev) 111 { 112 return 0; 113 } 114 115 void r128_driver_irq_uninstall(struct drm_device *dev) 116 { 117 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private; 118 if (!dev_priv) 119 return; 120 121 /* Disable *all* interrupts */ 122 R128_WRITE(R128_GEN_INT_CNTL, 0); 123 } 124