1 files changed, 161 insertions, 0 deletions

diff --git a/drivers/char/drm/i915_irq.c b/drivers/char/drm/i915_irq.c
new file mode 100644
index 0000000..b023926
--- /dev/null
+++ b/drivers/char/drm/i915_irq.c
@@ -0,0 +1,161 @@
+/* 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,
+		    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;
+
+	LOCK_TEST_WITH_RETURN(dev, filp);
+
+	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 i915_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 i915_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 i915_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);
+}