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/* 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 "via.h"
#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);
}
}
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