1/* r128_irq.c -- IRQ handling for radeon -*- linux-c -*- */
2/*
3 * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
4 *
5 * The Weather Channel (TM) funded Tungsten Graphics to develop the
6 * initial release of the Radeon 8500 driver under the XFree86 license.
7 * This notice must be preserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the next
17 * paragraph) shall be included in all copies or substantial portions of the
18 * Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
23 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
27 *
28 * Authors:
29 *    Keith Whitwell <keith@tungstengraphics.com>
30 *    Eric Anholt <anholt@FreeBSD.org>
31 */
32
33#include "drmP.h"
34#include "drm.h"
35#include "r128_drm.h"
36#include "r128_drv.h"
37
38irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
39{
40	drm_device_t *dev = (drm_device_t *) arg;
41	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
42	int status;
43
44	status = R128_READ(R128_GEN_INT_STATUS);
45
46	/* VBLANK interrupt */
47	if (status & R128_CRTC_VBLANK_INT) {
48		R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
49		atomic_inc(&dev->vbl_received);
50		DRM_WAKEUP(&dev->vbl_queue);
51		drm_vbl_send_signals(dev);
52		return IRQ_HANDLED;
53	}
54	return IRQ_NONE;
55}
56
57int r128_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence)
58{
59	unsigned int cur_vblank;
60	int ret = 0;
61
62	/* Assume that the user has missed the current sequence number
63	 * by about a day rather than she wants to wait for years
64	 * using vertical blanks...
65	 */
66	DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
67		    (((cur_vblank = atomic_read(&dev->vbl_received))
68		      - *sequence) <= (1 << 23)));
69
70	*sequence = cur_vblank;
71
72	return ret;
73}
74
75void r128_driver_irq_preinstall(drm_device_t * dev)
76{
77	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
78
79	/* Disable *all* interrupts */
80	R128_WRITE(R128_GEN_INT_CNTL, 0);
81	/* Clear vblank bit if it's already high */
82	R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
83}
84
85void r128_driver_irq_postinstall(drm_device_t * dev)
86{
87	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
88
89	/* Turn on VBL interrupt */
90	R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
91}
92
93void r128_driver_irq_uninstall(drm_device_t * dev)
94{
95	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
96	if (!dev_priv)
97		return;
98
99	/* Disable *all* interrupts */
100	R128_WRITE(R128_GEN_INT_CNTL, 0);
101}
102