Linux 2.6.20.7
[linux/fpc-iii.git] / drivers / char / drm / r128_irq.c
blob87f8ca2b0685aa4497fb2c02cb906b2f87cdbd40
1 /* r128_irq.c -- IRQ handling for radeon -*- linux-c -*- */
2 /*
3 * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
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.
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:
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.
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.
28 * Authors:
29 * Keith Whitwell <keith@tungstengraphics.com>
30 * Eric Anholt <anholt@FreeBSD.org>
33 #include "drmP.h"
34 #include "drm.h"
35 #include "r128_drm.h"
36 #include "r128_drv.h"
38 irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
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;
44 status = R128_READ(R128_GEN_INT_STATUS);
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;
54 return IRQ_NONE;
57 int r128_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence)
59 unsigned int cur_vblank;
60 int ret = 0;
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...
66 DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
67 (((cur_vblank = atomic_read(&dev->vbl_received))
68 - *sequence) <= (1 << 23)));
70 *sequence = cur_vblank;
72 return ret;
75 void r128_driver_irq_preinstall(drm_device_t * dev)
77 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
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);
85 void r128_driver_irq_postinstall(drm_device_t * dev)
87 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
89 /* Turn on VBL interrupt */
90 R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
93 void r128_driver_irq_uninstall(drm_device_t * dev)
95 drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
96 if (!dev_priv)
97 return;
99 /* Disable *all* interrupts */
100 R128_WRITE(R128_GEN_INT_CNTL, 0);