r128_irq.c

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/* r128_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 <[email protected]>
 *    Eric Anholt <[email protected]>
 */

#include <drm/drmP.h>
#include <drm/r128_drm.h>
#include "r128_drv.h"

u32 r128_get_vblank_counter(struct drm_device *dev, int crtc)
{
    const drm_r128_private_t *dev_priv = dev->dev_private;

    if (crtc != 0)
        return 0;

    return atomic_read(&dev_priv->vbl_received);
}

irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
{
    struct drm_device *dev = (struct drm_device *) arg;
    drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
    int status;

    status = R128_READ(R128_GEN_INT_STATUS);

    /* VBLANK interrupt */
    if (status & R128_CRTC_VBLANK_INT) {
        R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
        atomic_inc(&dev_priv->vbl_received);
        drm_handle_vblank(dev, 0);
        return IRQ_HANDLED;
    }
    return IRQ_NONE;
}

int r128_enable_vblank(struct drm_device *dev, int crtc)
{
    drm_r128_private_t *dev_priv = dev->dev_private;

    if (crtc != 0) {
        DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
        return -EINVAL;
    }

    R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
    return 0;
}

void r128_disable_vblank(struct drm_device *dev, int crtc)
{
    if (crtc != 0)
        DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);

    /*
     * FIXME: implement proper interrupt disable by using the vblank
     * counter register (if available)
     *
     * R128_WRITE(R128_GEN_INT_CNTL,
     *            R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN);
     */
}

void r128_driver_irq_preinstall(struct drm_device *dev)
{
    drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;

    /* Disable *all* interrupts */
    R128_WRITE(R128_GEN_INT_CNTL, 0);
    /* Clear vblank bit if it's already high */
    R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
}

int r128_driver_irq_postinstall(struct drm_device *dev)
{
    return 0;
}

void r128_driver_irq_uninstall(struct drm_device *dev)
{
    drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
    if (!dev_priv)
        return;

    /* Disable *all* interrupts */
    R128_WRITE(R128_GEN_INT_CNTL, 0);
}