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/* i915_dma.c -- DMA support for the I915 -*- linux-c -*-
*/
/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
**************************************************************************/
#define __NO_VERSION__
#include "i915.h"
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
#define USER_INT_FLAG 0x2
#define MAX_NOPID ((u32)~0)
#define READ_BREADCRUMB(dev_priv) (((u32*)(dev_priv->hw_status_page))[5])
irqreturn_t DRM(irq_handler)( DRM_IRQ_ARGS )
{
drm_device_t *dev = (drm_device_t *)arg;
drm_i915_private_t *dev_priv = (drm_i915_private_t *)dev->dev_private;
u16 temp;
temp = I915_READ16(I915REG_INT_IDENTITY_R);
temp &= USER_INT_FLAG;
DRM_DEBUG("%s flag=%08x\n", __FUNCTION__, temp);
if (temp == 0)
return IRQ_NONE;
I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
DRM_WAKEUP( &dev_priv->irq_queue );
return IRQ_HANDLED;
}
int i915_emit_irq(drm_device_t *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
u32 ret;
RING_LOCALS;
i915_kernel_lost_context(dev);
DRM_DEBUG("%s\n", __FUNCTION__);
ret = dev_priv->counter;
BEGIN_LP_RING(2);
OUT_RING( 0 );
OUT_RING( GFX_OP_USER_INTERRUPT );
ADVANCE_LP_RING();
return ret;
}
int i915_wait_irq(drm_device_t *dev, int irq_nr)
{
drm_i915_private_t *dev_priv =
(drm_i915_private_t *)dev->dev_private;
int ret = 0;
DRM_DEBUG("%s irq_nr=%d breadcrumb=%d\n", __FUNCTION__, irq_nr, READ_BREADCRUMB(dev_priv));
if (READ_BREADCRUMB(dev_priv) >= irq_nr)
return 0;
dev_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
DRM_WAIT_ON( ret, dev_priv->irq_queue, 3 * DRM_HZ,
READ_BREADCRUMB(dev_priv) >= irq_nr );
if (ret == DRM_ERR(EBUSY)) {
DRM_ERROR("%s: EBUSY -- rec: %d emitted: %d\n",
__FUNCTION__,
READ_BREADCRUMB(dev_priv),
(int)dev_priv->counter);
}
dev_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
return ret;
}
/* Needs the lock as it touches the ring.
*/
int i915_irq_emit( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_irq_emit_t emit;
int result;
if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
DRM_ERROR("i915_irq_emit called without lock held\n");
return DRM_ERR(EINVAL);
}
if ( !dev_priv ) {
DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
return DRM_ERR(EINVAL);
}
DRM_COPY_FROM_USER_IOCTL( emit, (drm_i915_irq_emit_t __user *)data,
sizeof(emit) );
result = i915_emit_irq( dev );
if ( DRM_COPY_TO_USER( emit.irq_seq, &result, sizeof(int) ) ) {
DRM_ERROR( "copy_to_user\n" );
return DRM_ERR(EFAULT);
}
return 0;
}
/* Doesn't need the hardware lock.
*/
int i915_irq_wait( DRM_IOCTL_ARGS )
{
DRM_DEVICE;
drm_i915_private_t *dev_priv = dev->dev_private;
drm_i915_irq_wait_t irqwait;
if ( !dev_priv ) {
DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
return DRM_ERR(EINVAL);
}
DRM_COPY_FROM_USER_IOCTL( irqwait, (drm_i915_irq_wait_t __user *)data,
sizeof(irqwait) );
return i915_wait_irq( dev, irqwait.irq_seq );
}
/* drm_dma.h hooks
*/
void DRM(driver_irq_preinstall)( drm_device_t *dev ) {
drm_i915_private_t *dev_priv =
(drm_i915_private_t *)dev->dev_private;
I915_WRITE16( I915REG_HWSTAM, 0xfffe );
I915_WRITE16( I915REG_INT_MASK_R, 0x0 );
I915_WRITE16( I915REG_INT_ENABLE_R, 0x0 );
}
void DRM(driver_irq_postinstall)( drm_device_t *dev ) {
drm_i915_private_t *dev_priv =
(drm_i915_private_t *)dev->dev_private;
I915_WRITE16( I915REG_INT_ENABLE_R, USER_INT_FLAG );
DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
}
void DRM(driver_irq_uninstall)( drm_device_t *dev ) {
drm_i915_private_t *dev_priv =
(drm_i915_private_t *)dev->dev_private;
if (!dev_priv)
return;
I915_WRITE16( I915REG_HWSTAM, 0xffff );
I915_WRITE16( I915REG_INT_MASK_R, 0xffff );
I915_WRITE16( I915REG_INT_ENABLE_R, 0x0 );
}
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