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 u32 mga_get_vblank_counter(struct drm_device *dev, int crtc)
40 const drm_mga_private_t *const dev_priv =
41 (drm_mga_private_t *) dev->dev_private;
48 return atomic_read(&dev_priv->vbl_received);
52 irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS)
54 struct drm_device *dev = (struct drm_device *) arg;
55 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
59 status = MGA_READ(MGA_STATUS);
61 /* VBLANK interrupt */
62 if (status & MGA_VLINEPEN) {
63 MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR);
64 atomic_inc(&dev_priv->vbl_received);
65 drm_handle_vblank(dev, 0);
69 /* SOFTRAP interrupt */
70 if (status & MGA_SOFTRAPEN) {
71 const u32 prim_start = MGA_READ(MGA_PRIMADDRESS);
72 const u32 prim_end = MGA_READ(MGA_PRIMEND);
74 MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR);
76 /* In addition to clearing the interrupt-pending bit, we
77 * have to write to MGA_PRIMEND to re-start the DMA operation.
79 if ((prim_start & ~0x03) != (prim_end & ~0x03)) {
80 MGA_WRITE(MGA_PRIMEND, prim_end);
83 atomic_inc(&dev_priv->last_fence_retired);
84 DRM_WAKEUP(&dev_priv->fence_queue);
94 int mga_enable_vblank(struct drm_device *dev, int crtc)
96 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
99 DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
104 MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN);
109 void mga_disable_vblank(struct drm_device *dev, int crtc)
112 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n",
116 /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have
117 * a nice hardware counter that tracks the number of refreshes when
118 * the interrupt is disabled, and the kernel doesn't know the refresh
119 * rate to calculate an estimate.
121 /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */
124 int mga_driver_fence_wait(struct drm_device * dev, unsigned int *sequence)
126 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
127 unsigned int cur_fence;
130 /* Assume that the user has missed the current sequence number
131 * by about a day rather than she wants to wait for years
134 DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ,
135 (((cur_fence = atomic_read(&dev_priv->last_fence_retired))
136 - *sequence) <= (1 << 23)));
138 *sequence = cur_fence;
143 void mga_driver_irq_preinstall(struct drm_device * dev)
145 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
147 /* Disable *all* interrupts */
148 MGA_WRITE(MGA_IEN, 0);
149 /* Clear bits if they're already high */
150 MGA_WRITE(MGA_ICLEAR, ~0);
153 int mga_driver_irq_postinstall(struct drm_device * dev)
155 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
158 ret = drm_vblank_init(dev, 1);
162 DRM_INIT_WAITQUEUE(&dev_priv->fence_queue);
164 /* Turn on soft trap interrupt. Vertical blank interrupts are enabled
165 * in mga_enable_vblank.
167 MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN);
171 void mga_driver_irq_uninstall(struct drm_device * dev)
173 drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
177 /* Disable *all* interrupts */
178 MGA_WRITE(MGA_IEN, 0);
180 dev->irq_enabled = 0;