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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.
*
**************************************************************************/
#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 i915_driver_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,
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