mach64_irq.c revision 145132 
1/* mach64_irq.c -- IRQ handling for ATI Mach64 -*- linux-c -*-
2 * Created: Tue Feb 25, 2003 by Leif Delgass, based on radeon_irq.c/r128_irq.c
3 *
4 * Copyright (C) The Weather Channel, Inc.  2002.
5 * Copyright 2003 Leif Delgass
6 * All Rights Reserved.
7 *
8 * The Weather Channel (TM) funded Tungsten Graphics to develop the
9 * initial release of the Radeon 8500 driver under the XFree86 license.
10 * This notice must be preserved.
11 *
12 * Permission is hereby granted, free of charge, to any person obtaining a
13 * copy of this software and associated documentation files (the "Software"),
14 * to deal in the Software without restriction, including without limitation
15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
16 * and/or sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following conditions:
18 *
19 * The above copyright notice and this permission notice (including the next
20 * paragraph) shall be included in all copies or substantial portions of the
21 * Software.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
26 * THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
27 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
28 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
29 * DEALINGS IN THE SOFTWARE.
30 *
31 * Authors:
32 *    Keith Whitwell <keith@tungstengraphics.com>
33 *    Eric Anholt <anholt@FreeBSD.org>
34 *    Leif Delgass <ldelgass@retinalburn.net>
35 *
36 * $FreeBSD: head/sys/dev/drm/mach64_irq.c 145132 2005-04-16 03:44:47Z anholt $
37 */
38
39#include "dev/drm/drmP.h"
40#include "dev/drm/drm.h"
41#include "dev/drm/mach64_drm.h"
42#include "dev/drm/mach64_drv.h"
43
44irqreturn_t mach64_driver_irq_handler(DRM_IRQ_ARGS)
45{
46	drm_device_t *dev = (drm_device_t *) arg;
47	drm_mach64_private_t *dev_priv =
48	    (drm_mach64_private_t *) dev->dev_private;
49	int status;
50
51	status = MACH64_READ(MACH64_CRTC_INT_CNTL);
52
53	/* VBLANK interrupt */
54	if (status & MACH64_CRTC_VBLANK_INT) {
55		/* Mask off all interrupt ack bits before setting the ack bit, since
56		 * there may be other handlers outside the DRM.
57		 *
58		 * NOTE: On mach64, you need to keep the enable bits set when doing
59		 * the ack, despite what the docs say about not acking and enabling
60		 * in a single write.
61		 */
62		MACH64_WRITE(MACH64_CRTC_INT_CNTL,
63			     (status & ~MACH64_CRTC_INT_ACKS)
64			     | MACH64_CRTC_VBLANK_INT);
65
66		atomic_inc(&dev->vbl_received);
67		DRM_WAKEUP(&dev->vbl_queue);
68		drm_vbl_send_signals(dev);
69		return IRQ_HANDLED;
70	}
71	return IRQ_NONE;
72}
73
74int mach64_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence)
75{
76	unsigned int cur_vblank;
77	int ret = 0;
78
79	/* Assume that the user has missed the current sequence number
80	 * by about a day rather than she wants to wait for years
81	 * using vertical blanks...
82	 */
83	DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
84		    (((cur_vblank = atomic_read(&dev->vbl_received))
85		      - *sequence) <= (1 << 23)));
86
87	*sequence = cur_vblank;
88
89	return ret;
90}
91
92/* drm_dma.h hooks
93*/
94void mach64_driver_irq_preinstall(drm_device_t * dev)
95{
96	drm_mach64_private_t *dev_priv =
97	    (drm_mach64_private_t *) dev->dev_private;
98
99	u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL);
100
101	DRM_DEBUG("before install CRTC_INT_CTNL: 0x%08x\n", status);
102
103	/* Disable and clear VBLANK interrupt */
104	MACH64_WRITE(MACH64_CRTC_INT_CNTL, (status & ~MACH64_CRTC_VBLANK_INT_EN)
105		     | MACH64_CRTC_VBLANK_INT);
106}
107
108void mach64_driver_irq_postinstall(drm_device_t * dev)
109{
110	drm_mach64_private_t *dev_priv =
111	    (drm_mach64_private_t *) dev->dev_private;
112
113	/* Turn on VBLANK interrupt */
114	MACH64_WRITE(MACH64_CRTC_INT_CNTL, MACH64_READ(MACH64_CRTC_INT_CNTL)
115		     | MACH64_CRTC_VBLANK_INT_EN);
116
117	DRM_DEBUG("after install CRTC_INT_CTNL: 0x%08x\n",
118		  MACH64_READ(MACH64_CRTC_INT_CNTL));
119
120}
121
122void mach64_driver_irq_uninstall(drm_device_t * dev)
123{
124	drm_mach64_private_t *dev_priv =
125	    (drm_mach64_private_t *) dev->dev_private;
126	if (!dev_priv)
127		return;
128
129	/* Disable and clear VBLANK interrupt */
130	MACH64_WRITE(MACH64_CRTC_INT_CNTL,
131		     (MACH64_READ(MACH64_CRTC_INT_CNTL) &
132		      ~MACH64_CRTC_VBLANK_INT_EN)
133		     | MACH64_CRTC_VBLANK_INT);
134
135	DRM_DEBUG("after uninstall CRTC_INT_CTNL: 0x%08x\n",
136		  MACH64_READ(MACH64_CRTC_INT_CNTL));
137}
138