1 files changed, 148 insertions, 0 deletions

diff --git a/drivers/gpu/drm/mga/mga_irq.c b/drivers/gpu/drm/mga/mga_irq.c
new file mode 100644
index 000000000000..9302cb8f0f83
--- /dev/null
+++ b/drivers/gpu/drm/mga/mga_irq.c
@@ -0,0 +1,148 @@
+/* mga_irq.c -- IRQ handling for radeon -*- linux-c -*-
+ *
+ * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
+ *
+ * The Weather Channel (TM) funded Tungsten Graphics to develop the
+ * initial release of the Radeon 8500 driver under the XFree86 license.
+ * This notice must be preserved.
+ *
+ * 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
+ * PRECISION INSIGHT 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>
+ *    Eric Anholt <anholt@FreeBSD.org>
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "mga_drm.h"
+#include "mga_drv.h"
+
+irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS)
+{
+        struct drm_device *dev = (struct drm_device *) arg;
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+        int status;
+        int handled = 0;
+
+        status = MGA_READ(MGA_STATUS);
+
+        /* VBLANK interrupt */
+        if (status & MGA_VLINEPEN) {
+                MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR);
+                atomic_inc(&dev->vbl_received);
+                DRM_WAKEUP(&dev->vbl_queue);
+                drm_vbl_send_signals(dev);
+                handled = 1;
+        }
+
+        /* SOFTRAP interrupt */
+        if (status & MGA_SOFTRAPEN) {
+                const u32 prim_start = MGA_READ(MGA_PRIMADDRESS);
+                const u32 prim_end = MGA_READ(MGA_PRIMEND);
+
+                MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR);
+
+                /* In addition to clearing the interrupt-pending bit, we
+                 * have to write to MGA_PRIMEND to re-start the DMA operation.
+                 */
+                if ((prim_start & ~0x03) != (prim_end & ~0x03)) {
+                        MGA_WRITE(MGA_PRIMEND, prim_end);
+                }
+
+                atomic_inc(&dev_priv->last_fence_retired);
+                DRM_WAKEUP(&dev_priv->fence_queue);
+                handled = 1;
+        }
+
+        if (handled) {
+                return IRQ_HANDLED;
+        }
+        return IRQ_NONE;
+}
+
+int mga_driver_vblank_wait(struct drm_device * dev, unsigned int *sequence)
+{
+        unsigned int cur_vblank;
+        int ret = 0;
+
+        /* Assume that the user has missed the current sequence number
+         * by about a day rather than she wants to wait for years
+         * using vertical blanks...
+         */
+        DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
+                    (((cur_vblank = atomic_read(&dev->vbl_received))
+                      - *sequence) <= (1 << 23)));
+
+        *sequence = cur_vblank;
+
+        return ret;
+}
+
+int mga_driver_fence_wait(struct drm_device * dev, unsigned int *sequence)
+{
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+        unsigned int cur_fence;
+        int ret = 0;
+
+        /* Assume that the user has missed the current sequence number
+         * by about a day rather than she wants to wait for years
+         * using fences.
+         */
+        DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * DRM_HZ,
+                    (((cur_fence = atomic_read(&dev_priv->last_fence_retired))
+                      - *sequence) <= (1 << 23)));
+
+        *sequence = cur_fence;
+
+        return ret;
+}
+
+void mga_driver_irq_preinstall(struct drm_device * dev)
+{
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+
+        /* Disable *all* interrupts */
+        MGA_WRITE(MGA_IEN, 0);
+        /* Clear bits if they're already high */
+        MGA_WRITE(MGA_ICLEAR, ~0);
+}
+
+void mga_driver_irq_postinstall(struct drm_device * dev)
+{
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+
+        DRM_INIT_WAITQUEUE(&dev_priv->fence_queue);
+
+        /* Turn on vertical blank interrupt and soft trap interrupt. */
+        MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN);
+}
+
+void mga_driver_irq_uninstall(struct drm_device * dev)
+{
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
+        if (!dev_priv)
+                return;
+
+        /* Disable *all* interrupts */
+        MGA_WRITE(MGA_IEN, 0);
+
+        dev->irq_enabled = 0;
+}