io/drm/drm_irq.c

	drm_irq.c revision 60405de4d8688d96dd05157c28db3ade5c9bc234
/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * drm_irq.c -- IRQ IOCTL and function support
 * Created: Fri Oct 18 2003 by anholt@FreeBSD.org
 */
/*
 * Copyright 2003 Eric Anholt
 * 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
 * ERIC ANHOLT 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:
 *    Eric Anholt <anholt@FreeBSD.org>
 *
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "drmP.h"
#include "drm.h"

/*ARGSUSED*/
int
drm_irq_by_busid(DRM_IOCTL_ARGS)
{
    DRM_DEVICE;
    drm_irq_busid_t irq;

    DRM_COPY_FROM_USER_IOCTL(irq, (drm_irq_busid_t *)data, sizeof (irq));

    if ((irq.busnum >> 8) != dev->pci_domain ||
        (irq.busnum & 0xff) != dev->pci_bus ||
        irq.devnum != dev->pci_slot ||
        irq.funcnum != dev->pci_func)
        return (DRM_ERR(EINVAL));

    irq.irq = dev->irq;

    DRM_DEBUG("%x:%x:%x => IRQ %x\n",
        irq.busnum, irq.devnum, irq.funcnum, irq.irq);

    DRM_COPY_TO_USER_IOCTL((drm_irq_busid_t *)data, irq, sizeof (irq));

    return (0);
}

/*ARGSUSED*/
static int
drm_install_irq_handle(drm_softstate_t *dev)
{
    dev_info_t *dip = NULL;

    dip = dev->dip;
    if (dip == NULL) {
        DRM_ERROR("drm_install_irq_handle: cannot get vgatext's dip");
        return (DDI_FAILURE);
    }

    if (ddi_intr_hilevel(dip, 0) != 0) {
        DRM_ERROR("drm_install_irq_handle: "
            "high-level interrupts are not supported");
        return (DDI_FAILURE);
    }

    if (ddi_get_iblock_cookie(dip, (uint_t)0,
        &dev->intr_block) != DDI_SUCCESS) {
        DRM_ERROR("drm_install_irq_handle: cannot get iblock cookie");
        return (DDI_FAILURE);
    }

    mutex_init(&dev->irq_lock, NULL, MUTEX_DRIVER, (void *)dev->intr_block);

    /* setup the interrupt handler */

    if (ddi_add_intr(dip, 0, &dev->intr_block,
        (ddi_idevice_cookie_t *)NULL, dev->irq_handler,
        (caddr_t)dev) != DDI_SUCCESS) {
        DRM_ERROR("drm_install_irq_handle: ddi_add_intr failed");
        return (DDI_FAILURE);
    }
    DRM_DEBUG("drm_install_irq_handle: add the intr handle successful");


    return (DDI_SUCCESS);
}

/*ARGSUSED*/
int
drm_irq_install(drm_softstate_t *dev)
{
    int ret;

    if (dev->dev_private == NULL) {
        DRM_ERROR("drm_irq_install: dev_private is NULL");
        return (DRM_ERR(EINVAL));
    }

    if (dev->irq_enabled) {
        DRM_ERROR("drm_irq_install: irq already enabled");
        return (DRM_ERR(EBUSY));
    }

    dev->context_flag = 0;

    /* before installing handler */
    dev->irq_preinstall(dev);

    /* install handler */
    ret  = drm_install_irq_handle(dev);
    if (ret != DDI_SUCCESS) {
        DRM_ERROR("drm_irq_install: drm_install_irq_handle failed");
        return (ret);
    }

    /* after installing handler */
    dev->irq_postinstall(dev);

    dev->irq_enabled = 1;

    return (DDI_SUCCESS);
}

static void
drm_uninstall_irq_handle(drm_device_t *dev)
{
    ASSERT(dev->dip);
    ddi_remove_intr(dev->dip, 0, dev->intr_block);
}


/*ARGSUSED*/
int
drm_irq_uninstall(drm_softstate_t *dev)
{

    dev->irq_enabled = 0;

    dev->irq_uninstall(dev);

    drm_uninstall_irq_handle(dev);

    return (DDI_SUCCESS);
}

/*ARGSUSED*/
int
drm_control(DRM_IOCTL_ARGS)
{
    DRM_DEVICE;
    drm_control_t ctl;
    int err;

    DRM_DEBUG("drm_control: install irq = %x\n", dev->irq);
    DRM_COPY_FROM_USER_IOCTL(ctl, (drm_control_t *)data, sizeof (ctl));

    switch (ctl.func) {
    case DRM_INST_HANDLER:
        /*
         * Handle drivers whose DRM used to require IRQ setup but the
         * no longer does.
         */
        return (drm_irq_install(dev));
    case DRM_UNINST_HANDLER:
        err = drm_irq_uninstall(dev);
        return (err);
    default:
        return (DRM_ERR(EINVAL));
    }
}

/*ARGSUSED*/
int
drm_wait_vblank(DRM_IOCTL_ARGS)
{
    return (0);
}