mach64_irq.c revision 152909 
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/*-
5 * Copyright (C) The Weather Channel, Inc.  2002.
6 * Copyright 2003 Leif Delgass
7 * All Rights Reserved.
8 *
9 * The Weather Channel (TM) funded Tungsten Graphics to develop the
10 * initial release of the Radeon 8500 driver under the XFree86 license.
11 * This notice must be preserved.
12 *
13 * Permission is hereby granted, free of charge, to any person obtaining a
14 * copy of this software and associated documentation files (the "Software"),
15 * to deal in the Software without restriction, including without limitation
16 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
17 * and/or sell copies of the Software, and to permit persons to whom the
18 * Software is furnished to do so, subject to the following conditions:
19 *
20 * The above copyright notice and this permission notice (including the next
21 * paragraph) shall be included in all copies or substantial portions of the
22 * Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
27 * THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
28 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
29 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
30 * DEALINGS IN THE SOFTWARE.
31 *
32 * Authors:
33 *    Keith Whitwell <keith@tungstengraphics.com>
34 *    Eric Anholt <anholt@FreeBSD.org>
35 *    Leif Delgass <ldelgass@retinalburn.net>
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/sys/dev/drm/mach64_irq.c 152909 2005-11-28 23:13:57Z anholt $");
40
41#include "dev/drm/drmP.h"
42#include "dev/drm/drm.h"
43#include "dev/drm/mach64_drm.h"
44#include "dev/drm/mach64_drv.h"
45
46irqreturn_t mach64_driver_irq_handler(DRM_IRQ_ARGS)
47{
48	drm_device_t *dev = (drm_device_t *) arg;
49	drm_mach64_private_t *dev_priv =
50	    (drm_mach64_private_t *) dev->dev_private;
51	int status;
52
53	status = MACH64_READ(MACH64_CRTC_INT_CNTL);
54
55	/* VBLANK interrupt */
56	if (status & MACH64_CRTC_VBLANK_INT) {
57		/* Mask off all interrupt ack bits before setting the ack bit, since
58		 * there may be other handlers outside the DRM.
59		 *
60		 * NOTE: On mach64, you need to keep the enable bits set when doing
61		 * the ack, despite what the docs say about not acking and enabling
62		 * in a single write.
63		 */
64		MACH64_WRITE(MACH64_CRTC_INT_CNTL,
65			     (status & ~MACH64_CRTC_INT_ACKS)
66			     | MACH64_CRTC_VBLANK_INT);
67
68		atomic_inc(&dev->vbl_received);
69		DRM_WAKEUP(&dev->vbl_queue);
70		drm_vbl_send_signals(dev);
71		return IRQ_HANDLED;
72	}
73	return IRQ_NONE;
74}
75
76int mach64_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence)
77{
78	unsigned int cur_vblank;
79	int ret = 0;
80
81	/* Assume that the user has missed the current sequence number
82	 * by about a day rather than she wants to wait for years
83	 * using vertical blanks...
84	 */
85	DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
86		    (((cur_vblank = atomic_read(&dev->vbl_received))
87		      - *sequence) <= (1 << 23)));
88
89	*sequence = cur_vblank;
90
91	return ret;
92}
93
94/* drm_dma.h hooks
95*/
96void mach64_driver_irq_preinstall(drm_device_t * dev)
97{
98	drm_mach64_private_t *dev_priv =
99	    (drm_mach64_private_t *) dev->dev_private;
100
101	u32 status = MACH64_READ(MACH64_CRTC_INT_CNTL);
102
103	DRM_DEBUG("before install CRTC_INT_CTNL: 0x%08x\n", status);
104
105	/* Disable and clear VBLANK interrupt */
106	MACH64_WRITE(MACH64_CRTC_INT_CNTL, (status & ~MACH64_CRTC_VBLANK_INT_EN)
107		     | MACH64_CRTC_VBLANK_INT);
108}
109
110void mach64_driver_irq_postinstall(drm_device_t * dev)
111{
112	drm_mach64_private_t *dev_priv =
113	    (drm_mach64_private_t *) dev->dev_private;
114
115	/* Turn on VBLANK interrupt */
116	MACH64_WRITE(MACH64_CRTC_INT_CNTL, MACH64_READ(MACH64_CRTC_INT_CNTL)
117		     | MACH64_CRTC_VBLANK_INT_EN);
118
119	DRM_DEBUG("after install CRTC_INT_CTNL: 0x%08x\n",
120		  MACH64_READ(MACH64_CRTC_INT_CNTL));
121
122}
123
124void mach64_driver_irq_uninstall(drm_device_t * dev)
125{
126	drm_mach64_private_t *dev_priv =
127	    (drm_mach64_private_t *) dev->dev_private;
128	if (!dev_priv)
129		return;
130
131	/* Disable and clear VBLANK interrupt */
132	MACH64_WRITE(MACH64_CRTC_INT_CNTL,
133		     (MACH64_READ(MACH64_CRTC_INT_CNTL) &
134		      ~MACH64_CRTC_VBLANK_INT_EN)
135		     | MACH64_CRTC_VBLANK_INT);
136
137	DRM_DEBUG("after uninstall CRTC_INT_CTNL: 0x%08x\n",
138		  MACH64_READ(MACH64_CRTC_INT_CNTL));
139}
140