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mga_irq.c

/* 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;
}

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