From 291ffeae9a2b95cf35835ddd0f25e434e4c26f44 Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keith@tungstengraphics.com>
Date: Thu, 10 Jun 2004 12:45:38 +0000
Subject: i915.o drm driver

---
 shared-core/i915_irq.c | 173 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 shared-core/i915_irq.c

(limited to 'shared-core/i915_irq.c')

diff --git a/shared-core/i915_irq.c b/shared-core/i915_irq.c
new file mode 100644
index 00000000..f9d5d4b7
--- /dev/null
+++ b/shared-core/i915_irq.c
@@ -0,0 +1,173 @@
+/* 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 *)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 *)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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