1 /* mga_irq.c -- IRQ handling for radeon -*- linux-c -*-
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
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.
29 * Keith Whitwell <keith@tungstengraphics.com>
30 * Eric Anholt <anholt@FreeBSD.org>
38 irqreturn_t mga_driver_irq_handler( DRM_IRQ_ARGS )
40 drm_device_t *dev = (drm_device_t *) arg;
41 drm_mga_private_t *dev_priv =
42 (drm_mga_private_t *)dev->dev_private;
46 status = MGA_READ(MGA_STATUS);
48 /* VBLANK interrupt */
49 if ( status & MGA_VLINEPEN ) {
50 MGA_WRITE( MGA_ICLEAR, MGA_VLINEICLR );
51 atomic_inc(&dev->vbl_received);
52 DRM_WAKEUP(&dev->vbl_queue);
53 drm_vbl_send_signals(dev);
57 /* SOFTRAP interrupt */
58 if (status & MGA_SOFTRAPEN) {
59 const u32 prim_start = MGA_READ(MGA_PRIMADDRESS);
60 const u32 prim_end = MGA_READ(MGA_PRIMEND);
63 MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR);
65 /* In addition to clearing the interrupt-pending bit, we
66 * have to write to MGA_PRIMEND to re-start the DMA operation.
68 if ( (prim_start & ~0x03) != (prim_end & ~0x03) ) {
69 MGA_WRITE(MGA_PRIMEND, prim_end);
72 atomic_inc(&dev_priv->last_fence_retired);
73 DRM_WAKEUP(&dev_priv->fence_queue);
83 int mga_driver_vblank_wait(drm_device_t *dev, unsigned int *sequence)
85 unsigned int cur_vblank;
88 /* Assume that the user has missed the current sequence number
89 * by about a day rather than she wants to wait for years
90 * using vertical blanks...
92 DRM_WAIT_ON( ret, dev->vbl_queue, 3*DRM_HZ,
93 ( ( ( cur_vblank = atomic_read(&dev->vbl_received ) )
94 - *sequence ) <= (1<<23) ) );
96 *sequence = cur_vblank;
101 int mga_driver_fence_wait(drm_device_t * dev, unsigned int *sequence)
103 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
104 unsigned int cur_fence;
107 /* Assume that the user has missed the current sequence number
108 * by about a day rather than she wants to wait for years
111 DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ,
112 (((cur_fence = atomic_read(&dev_priv->last_fence_retired))
113 - *sequence) <= (1 << 23)));
115 *sequence = cur_fence;
120 void mga_driver_irq_preinstall(drm_device_t * dev)
122 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
124 /* Disable *all* interrupts */
125 MGA_WRITE( MGA_IEN, 0 );
126 /* Clear bits if they're already high */
127 MGA_WRITE( MGA_ICLEAR, ~0 );
130 void mga_driver_irq_postinstall(drm_device_t * dev)
132 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
134 DRM_INIT_WAITQUEUE( &dev_priv->fence_queue );
136 /* Turn on vertical blank interrupt and soft trap interrupt. */
137 MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN);
140 void mga_driver_irq_uninstall( drm_device_t *dev ) {
141 drm_mga_private_t *dev_priv =
142 (drm_mga_private_t *)dev->dev_private;
146 /* Disable *all* interrupts */
147 MGA_WRITE(MGA_IEN, 0);
149 dev->irq_enabled = 0;