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path: root/drivers/gpu/drm/i830/i830_irq.c
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Diffstat (limited to 'drivers/gpu/drm/i830/i830_irq.c')
-rw-r--r--drivers/gpu/drm/i830/i830_irq.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i830/i830_irq.c b/drivers/gpu/drm/i830/i830_irq.c
new file mode 100644
index 00000000000..91ec2bb497e
--- /dev/null
+++ b/drivers/gpu/drm/i830/i830_irq.c
@@ -0,0 +1,186 @@
+/* i830_dma.c -- DMA support for the I830 -*- linux-c -*-
+ *
+ * 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
+ * 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: Keith Whitwell <keith@tungstengraphics.com>
+ *
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "i830_drm.h"
+#include "i830_drv.h"
+#include <linux/interrupt.h> /* For task queue support */
+#include <linux/delay.h>
+
+irqreturn_t i830_driver_irq_handler(DRM_IRQ_ARGS)
+{
+ struct drm_device *dev = (struct drm_device *) arg;
+ drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
+ u16 temp;
+
+ temp = I830_READ16(I830REG_INT_IDENTITY_R);
+ DRM_DEBUG("%x\n", temp);
+
+ if (!(temp & 2))
+ return IRQ_NONE;
+
+ I830_WRITE16(I830REG_INT_IDENTITY_R, temp);
+
+ atomic_inc(&dev_priv->irq_received);
+ wake_up_interruptible(&dev_priv->irq_queue);
+
+ return IRQ_HANDLED;
+}
+
+static int i830_emit_irq(struct drm_device * dev)
+{
+ drm_i830_private_t *dev_priv = dev->dev_private;
+ RING_LOCALS;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ atomic_inc(&dev_priv->irq_emitted);
+
+ BEGIN_LP_RING(2);
+ OUT_RING(0);
+ OUT_RING(GFX_OP_USER_INTERRUPT);
+ ADVANCE_LP_RING();
+
+ return atomic_read(&dev_priv->irq_emitted);
+}
+
+static int i830_wait_irq(struct drm_device * dev, int irq_nr)
+{
+ drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
+ DECLARE_WAITQUEUE(entry, current);
+ unsigned long end = jiffies + HZ * 3;
+ int ret = 0;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ if (atomic_read(&dev_priv->irq_received) >= irq_nr)
+ return 0;
+
+ dev_priv->sarea_priv->perf_boxes |= I830_BOX_WAIT;
+
+ add_wait_queue(&dev_priv->irq_queue, &entry);
+
+ for (;;) {
+ __set_current_state(TASK_INTERRUPTIBLE);
+ if (atomic_read(&dev_priv->irq_received) >= irq_nr)
+ break;
+ if ((signed)(end - jiffies) <= 0) {
+ DRM_ERROR("timeout iir %x imr %x ier %x hwstam %x\n",
+ I830_READ16(I830REG_INT_IDENTITY_R),
+ I830_READ16(I830REG_INT_MASK_R),
+ I830_READ16(I830REG_INT_ENABLE_R),
+ I830_READ16(I830REG_HWSTAM));
+
+ ret = -EBUSY; /* Lockup? Missed irq? */
+ break;
+ }
+ schedule_timeout(HZ * 3);
+ if (signal_pending(current)) {
+ ret = -EINTR;
+ break;
+ }
+ }
+
+ __set_current_state(TASK_RUNNING);
+ remove_wait_queue(&dev_priv->irq_queue, &entry);
+ return ret;
+}
+
+/* Needs the lock as it touches the ring.
+ */
+int i830_irq_emit(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ drm_i830_private_t *dev_priv = dev->dev_private;
+ drm_i830_irq_emit_t *emit = data;
+ int result;
+
+ LOCK_TEST_WITH_RETURN(dev, file_priv);
+
+ if (!dev_priv) {
+ DRM_ERROR("%s called with no initialization\n", __func__);
+ return -EINVAL;
+ }
+
+ result = i830_emit_irq(dev);
+
+ if (copy_to_user(emit->irq_seq, &result, sizeof(int))) {
+ DRM_ERROR("copy_to_user\n");
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+/* Doesn't need the hardware lock.
+ */
+int i830_irq_wait(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ drm_i830_private_t *dev_priv = dev->dev_private;
+ drm_i830_irq_wait_t *irqwait = data;
+
+ if (!dev_priv) {
+ DRM_ERROR("%s called with no initialization\n", __func__);
+ return -EINVAL;
+ }
+
+ return i830_wait_irq(dev, irqwait->irq_seq);
+}
+
+/* drm_dma.h hooks
+*/
+void i830_driver_irq_preinstall(struct drm_device * dev)
+{
+ drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
+
+ I830_WRITE16(I830REG_HWSTAM, 0xffff);
+ I830_WRITE16(I830REG_INT_MASK_R, 0x0);
+ I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
+ atomic_set(&dev_priv->irq_received, 0);
+ atomic_set(&dev_priv->irq_emitted, 0);
+ init_waitqueue_head(&dev_priv->irq_queue);
+}
+
+void i830_driver_irq_postinstall(struct drm_device * dev)
+{
+ drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
+
+ I830_WRITE16(I830REG_INT_ENABLE_R, 0x2);
+}
+
+void i830_driver_irq_uninstall(struct drm_device * dev)
+{
+ drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
+ if (!dev_priv)
+ return;
+
+ I830_WRITE16(I830REG_INT_MASK_R, 0xffff);
+ I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
+}