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
r128_get_vblank_counter(struct drm_device * dev,unsigned int pipe)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
r128_driver_irq_handler(int irq,void * arg)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
r128_enable_vblank(struct drm_device * dev,unsigned int pipe)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
r128_disable_vblank(struct drm_device * dev,unsigned int pipe)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
r128_driver_irq_preinstall(struct drm_device * dev)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
r128_driver_irq_postinstall(struct drm_device * dev)110 int r128_driver_irq_postinstall(struct drm_device *dev)
111 {
112 return 0;
113 }
114
r128_driver_irq_uninstall(struct drm_device * dev)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