1 /* mga_irq.c -- IRQ handling for radeon -*- linux-c -*-
4 * Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
6 * The Weather Channel (TM) funded Tungsten Graphics to develop the
7 * initial release of the Radeon 8500 driver under the XFree86 license.
8 * This notice must be preserved.
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice (including the next
18 * paragraph) shall be included in all copies or substantial portions of the
21 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
24 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
25 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
26 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27 * DEALINGS IN THE SOFTWARE.
30 * Keith Whitwell <keith@tungstengraphics.com>
31 * Eric Anholt <anholt@FreeBSD.org>
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "dev/drm/drmP.h"
38 #include "dev/drm/drm.h"
39 #include "dev/drm/mga_drm.h"
40 #include "dev/drm/mga_drv.h"
42 irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS)
44 drm_device_t *dev = (drm_device_t *) arg;
45 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
49 status = MGA_READ(MGA_STATUS);
51 /* VBLANK interrupt */
52 if (status & MGA_VLINEPEN) {
53 MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR);
54 atomic_inc(&dev->vbl_received);
55 DRM_WAKEUP(&dev->vbl_queue);
56 drm_vbl_send_signals(dev);
60 /* SOFTRAP interrupt */
61 if (status & MGA_SOFTRAPEN) {
62 const u32 prim_start = MGA_READ(MGA_PRIMADDRESS);
63 const u32 prim_end = MGA_READ(MGA_PRIMEND);
66 MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR);
68 /* In addition to clearing the interrupt-pending bit, we
69 * have to write to MGA_PRIMEND to re-start the DMA operation.
71 if ( (prim_start & ~0x03) != (prim_end & ~0x03) ) {
72 MGA_WRITE(MGA_PRIMEND, prim_end);
75 atomic_inc(&dev_priv->last_fence_retired);
76 DRM_WAKEUP(&dev_priv->fence_queue);
86 int mga_driver_vblank_wait(drm_device_t * dev, unsigned int *sequence)
88 unsigned int cur_vblank;
91 /* Assume that the user has missed the current sequence number
92 * by about a day rather than she wants to wait for years
93 * using vertical blanks...
95 DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
96 (((cur_vblank = atomic_read(&dev->vbl_received))
97 - *sequence) <= (1 << 23)));
99 *sequence = cur_vblank;
104 int mga_driver_fence_wait(drm_device_t * dev, unsigned int *sequence)
106 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
107 unsigned int cur_fence;
110 /* Assume that the user has missed the current sequence number
111 * by about a day rather than she wants to wait for years
114 DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ,
115 (((cur_fence = atomic_read(&dev_priv->last_fence_retired))
116 - *sequence) <= (1 << 23)));
118 *sequence = cur_fence;
123 void mga_driver_irq_preinstall(drm_device_t * dev)
125 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
127 /* Disable *all* interrupts */
128 MGA_WRITE(MGA_IEN, 0);
129 /* Clear bits if they're already high */
130 MGA_WRITE(MGA_ICLEAR, ~0);
133 void mga_driver_irq_postinstall(drm_device_t * dev)
135 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
137 DRM_INIT_WAITQUEUE( &dev_priv->fence_queue );
139 /* Turn on vertical blank interrupt and soft trap interrupt. */
140 MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN);
143 void mga_driver_irq_uninstall(drm_device_t * dev)
145 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
149 /* Disable *all* interrupts */
150 MGA_WRITE(MGA_IEN, 0);
152 dev->irq_enabled = 0;