1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
|
/* via_irq.c
*
* Copyright 2004 BEAM Ltd.
* Copyright 2002 Tungsten Graphics, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BEAM LTD, TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors:
* Terry Barnaby <terry1@beam.ltd.uk>
* Keith Whitwell <keith@tungstengraphics.com>
*
*
* This code provides standard DRM access to the Via CLE266's Vertical blank
* interrupt.
*/
#include "drmP.h"
#include "drm.h"
#include "via_drm.h"
#include "via_drv.h"
#define VIA_REG_INTERRUPT 0x200
/* VIA_REG_INTERRUPT */
#define VIA_IRQ_GLOBAL (1 << 31)
#define VIA_IRQ_VBI_ENABLE (1 << 19)
#define VIA_IRQ_VBI_PENDING (1 << 3)
irqreturn_t via_driver_irq_handler( DRM_IRQ_ARGS )
{
drm_device_t* dev = (drm_device_t*)arg;
drm_via_private_t* dev_priv = (drm_via_private_t*)dev->dev_private;
u32 status;
int handled = 0;
status = VIA_READ(VIA_REG_INTERRUPT);
DRM_DEBUG("viadrv_irq_handler Status: %x\n",status);
if(status & VIA_IRQ_VBI_PENDING){
atomic_inc(&dev->vbl_received);
DRM_WAKEUP(&dev->vbl_queue);
drm_vbl_send_signals(dev);
handled = 1;
}
/* Acknowlege interrupts ?? */
VIA_WRITE(VIA_REG_INTERRUPT, status);
if (handled)
return IRQ_HANDLED;
else
return IRQ_NONE;
}
static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t* dev_priv)
{
u32 status;
if(dev_priv){
/* Acknowlege interrupts ?? */
status = VIA_READ(VIA_REG_INTERRUPT);
VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_VBI_PENDING);
}
}
int via_driver_vblank_wait(drm_device_t* dev, unsigned int* sequence)
{
drm_via_private_t* dev_priv = (drm_via_private_t*)dev->dev_private;
unsigned int cur_vblank;
int ret = 0;
DRM_DEBUG("viadrv_vblank_wait\n");
if(!dev_priv){
DRM_ERROR("%s called with no initialization\n", __FUNCTION__ );
return -EINVAL;
}
viadrv_acknowledge_irqs(dev_priv);
/* Assume that the user has missed the current sequence number
* by about a day rather than she wants to wait for years
* using vertical blanks...
*/
DRM_WAIT_ON(ret, dev->vbl_queue, 3*DRM_HZ,
(((cur_vblank = atomic_read(&dev->vbl_received)) -
*sequence ) <= (1<<23)));
*sequence = cur_vblank;
return ret;
}
/*
* drm_dma.h hooks
*/
void via_driver_irq_preinstall(drm_device_t* dev){
drm_via_private_t* dev_priv = (drm_via_private_t *)dev->dev_private;
u32 status;
DRM_DEBUG("driver_irq_preinstall: dev_priv: %p\n", dev_priv);
if(dev_priv){
DRM_DEBUG("mmio: %p\n", dev_priv->mmio);
status = VIA_READ(VIA_REG_INTERRUPT);
DRM_DEBUG("intreg: %x\n", status & VIA_IRQ_VBI_ENABLE);
// Clear VSync interrupt regs
VIA_WRITE(VIA_REG_INTERRUPT, status & ~VIA_IRQ_VBI_ENABLE);
/* Clear bits if they're already high */
viadrv_acknowledge_irqs(dev_priv);
}
}
void via_driver_irq_postinstall(drm_device_t* dev){
drm_via_private_t* dev_priv = (drm_via_private_t *)dev->dev_private;
u32 status;
DRM_DEBUG("via_driver_irq_postinstall\n");
if(dev_priv){
status = VIA_READ(VIA_REG_INTERRUPT);
VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
| VIA_IRQ_VBI_ENABLE);
/* Some magic, oh for some data sheets ! */
VIA_WRITE8(0x83d4, 0x11);
VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);
}
}
void via_driver_irq_uninstall(drm_device_t* dev){
drm_via_private_t* dev_priv = (drm_via_private_t *)dev->dev_private;
u32 status;
DRM_DEBUG("driver_irq_uninstall)\n");
if(dev_priv){
/* Some more magic, oh for some data sheets ! */
VIA_WRITE8(0x83d4, 0x11);
VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);
status = VIA_READ(VIA_REG_INTERRUPT);
VIA_WRITE(VIA_REG_INTERRUPT, status & ~VIA_IRQ_VBI_ENABLE);
}
}
|
