/* 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 "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>
irqreturn_t i830_driver_irq_handler(DRM_IRQ_ARGS)
{
struct drm_device *dev = (struct drm_device *) arg;
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
u16 temp;
temp = I830_READ16(I830REG_INT_IDENTITY_R);
DRM_DEBUG("%x\n", temp);
if (!(temp & 2))
return IRQ_NONE;
I830_WRITE16(I830REG_INT_IDENTITY_R, temp);
atomic_inc(&dev_priv->irq_received);
wake_up_interruptible(&dev_priv->irq_queue);
return IRQ_HANDLED;
}
static int i830_emit_irq(struct drm_device * dev)
{
drm_i830_private_t *dev_priv = dev->dev_private;
RING_LOCALS;
DRM_DEBUG("%s\n", __func__);
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);
}
static int i830_wait_irq(struct drm_device * 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", __func__);
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 (;;) {
__set_current_state(TASK_INTERRUPTIBLE);
if (atomic_read(&dev_priv->irq_received) >= irq_nr)
break;
if ((signed)(end - jiffies) <= 0) {
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;
}
}
__set_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 drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i830_private_t *dev_priv = dev->dev_private;
drm_i830_irq_emit_t *emit = data;
int result;
LOCK_TEST_WITH_RETURN(dev, file_priv);
if (!dev_priv) {
DRM_ERROR("%s called with no initialization\n", __func__);
return -EINVAL;
}
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 drm_device *dev, void *data,
struct drm_file *file_priv)
{
drm_i830_private_t *dev_priv = dev->dev_private;
drm_i830_irq_wait_t *irqwait = data;
if (!dev_priv) {
DRM_ERROR("%s called with no initialization\n", __func__);
return -EINVAL;
}
return i830_wait_irq(dev, irqwait->irq_seq);
}
/* drm_dma.h hooks
*/
void i830_driver_irq_preinstall(struct drm_device * dev)
{
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
I830_WRITE16(I830REG_HWSTAM, 0xffff);
I830_WRITE16(I830REG_INT_MASK_R, 0x0);
I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
atomic_set(&dev_priv->irq_received, 0);
atomic_set(&dev_priv->irq_emitted, 0);
init_waitqueue_head(&dev_priv->irq_queue);
}
void i830_driver_irq_postinstall(struct drm_device * dev)
{
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
I830_WRITE16(I830REG_INT_ENABLE_R, 0x2);
}
void i830_driver_irq_uninstall(struct drm_device * dev)
{
drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
if (!dev_priv)
return;
I830_WRITE16(I830REG_INT_MASK_R, 0xffff);
I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
}
