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/* 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 "i830.h"

#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>

void DRM(dma_service)(int irq, void *device, struct pt_regs *regs)

{

        drm_device_t     *dev = (drm_device_t *)device;

        drm_i830_private_t *dev_priv = (drm_i830_private_t *)dev->dev_private;

        u16 temp;

        temp = I830_READ16(I830REG_INT_IDENTITY_R);

        printk("%s: %x\n", __FUNCTION__, temp);

        if(temp == 0)

           return;

        I830_WRITE16(I830REG_INT_IDENTITY_R, temp);

        if (temp & 2) {

                atomic_inc(&dev_priv->irq_received);

                wake_up_interruptible(&dev_priv->irq_queue);

        }

}

int i830_emit_irq(drm_device_t *dev)

{

        drm_i830_private_t *dev_priv = dev->dev_private;

        RING_LOCALS;

        DRM_DEBUG("%s\n", __FUNCTION__);

        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);

}

int i830_wait_irq(drm_device_t *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", __FUNCTION__);

        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 (;;) {

                current->state = TASK_INTERRUPTIBLE;

                if (atomic_read(&dev_priv->irq_received) >= irq_nr)

                   break;

                if (time_after(jiffies, end)) {

                        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;

                }

        }

        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 inode *inode, struct file *filp, unsigned int cmd,

                   unsigned long arg )

{

        drm_file_t        *priv     = filp->private_data;

        drm_device_t      *dev      = priv->dev;

        drm_i830_private_t *dev_priv = dev->dev_private;

        drm_i830_irq_emit_t emit;

        int result;

        if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {

                DRM_ERROR("i830_irq_emit called without lock held\n");

                return -EINVAL;

        }

        if ( !dev_priv ) {

                DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );

                return -EINVAL;

        }

        if (copy_from_user( &emit, (drm_i830_irq_emit_t *)arg, sizeof(emit) ))

                return -EFAULT;

        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 inode *inode, struct file *filp, unsigned int cmd,

                   unsigned long arg )

{

        drm_file_t        *priv     = filp->private_data;

        drm_device_t      *dev      = priv->dev;

        drm_i830_private_t *dev_priv = dev->dev_private;

        drm_i830_irq_wait_t irqwait;

        if ( !dev_priv ) {

                DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );

                return -EINVAL;

        }

        if (copy_from_user( &irqwait, (drm_i830_irq_wait_t *)arg,

                            sizeof(irqwait) ))

                return -EFAULT;

        return i830_wait_irq( dev, irqwait.irq_seq );

}