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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/gpu/drm/mga/mga_irq.c
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>
39 u32
mga_get_vblank_counter(struct drm_device
*dev
, int crtc
)
41 const drm_mga_private_t
*const dev_priv
=
42 (drm_mga_private_t
*) dev
->dev_private
;
47 return atomic_read(&dev_priv
->vbl_received
);
51 irqreturn_t
mga_driver_irq_handler(DRM_IRQ_ARGS
)
53 struct drm_device
*dev
= (struct drm_device
*) arg
;
54 drm_mga_private_t
*dev_priv
= (drm_mga_private_t
*) dev
->dev_private
;
58 status
= MGA_READ(MGA_STATUS
);
60 /* VBLANK interrupt */
61 if (status
& MGA_VLINEPEN
) {
62 MGA_WRITE(MGA_ICLEAR
, MGA_VLINEICLR
);
63 atomic_inc(&dev_priv
->vbl_received
);
64 drm_handle_vblank(dev
, 0);
68 /* SOFTRAP interrupt */
69 if (status
& MGA_SOFTRAPEN
) {
70 const u32 prim_start
= MGA_READ(MGA_PRIMADDRESS
);
71 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
);
93 int mga_enable_vblank(struct drm_device
*dev
, int crtc
)
95 drm_mga_private_t
*dev_priv
= (drm_mga_private_t
*) dev
->dev_private
;
98 DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
103 MGA_WRITE(MGA_IEN
, MGA_VLINEIEN
| MGA_SOFTRAPEN
);
108 void mga_disable_vblank(struct drm_device
*dev
, int crtc
)
111 DRM_ERROR("tried to disable vblank on non-existent crtc %d\n",
115 /* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have
116 * a nice hardware counter that tracks the number of refreshes when
117 * the interrupt is disabled, and the kernel doesn't know the refresh
118 * rate to calculate an estimate.
120 /* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */
123 int mga_driver_fence_wait(struct drm_device
* dev
, unsigned int *sequence
)
125 drm_mga_private_t
*dev_priv
= (drm_mga_private_t
*) dev
->dev_private
;
126 unsigned int cur_fence
;
129 /* Assume that the user has missed the current sequence number
130 * by about a day rather than she wants to wait for years
133 DRM_WAIT_ON(ret
, dev_priv
->fence_queue
, 3 * DRM_HZ
,
134 (((cur_fence
= atomic_read(&dev_priv
->last_fence_retired
))
135 - *sequence
) <= (1 << 23)));
137 *sequence
= cur_fence
;
142 void mga_driver_irq_preinstall(struct drm_device
* dev
)
144 drm_mga_private_t
*dev_priv
= (drm_mga_private_t
*) dev
->dev_private
;
146 /* Disable *all* interrupts */
147 MGA_WRITE(MGA_IEN
, 0);
148 /* Clear bits if they're already high */
149 MGA_WRITE(MGA_ICLEAR
, ~0);
152 int mga_driver_irq_postinstall(struct drm_device
*dev
)
154 drm_mga_private_t
*dev_priv
= (drm_mga_private_t
*) dev
->dev_private
;
156 DRM_INIT_WAITQUEUE(&dev_priv
->fence_queue
);
158 /* Turn on soft trap interrupt. Vertical blank interrupts are enabled
159 * in mga_enable_vblank.
161 MGA_WRITE(MGA_IEN
, MGA_SOFTRAPEN
);
165 void mga_driver_irq_uninstall(struct drm_device
* dev
)
167 drm_mga_private_t
*dev_priv
= (drm_mga_private_t
*) dev
->dev_private
;
171 /* Disable *all* interrupts */
172 MGA_WRITE(MGA_IEN
, 0);
174 dev
->irq_enabled
= 0;