![Nicolas Kaiser](/assets/img/avatar_default.png)
Fixed brace and spacing coding style issues. Signed-off-by: Nicolas Kaiser <nikai@nikai.net> Signed-off-by: Dave Airlie <airlied@redhat.com>
187 lines
4.9 KiB
C
187 lines
4.9 KiB
C
/* i830_dma.c -- DMA support for the I830 -*- linux-c -*-
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*
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* Copyright 2002 Tungsten Graphics, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Authors: Keith Whitwell <keith@tungstengraphics.com>
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*
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*/
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#include "drmP.h"
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#include "drm.h"
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#include "i830_drm.h"
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#include "i830_drv.h"
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#include <linux/interrupt.h> /* For task queue support */
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#include <linux/delay.h>
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irqreturn_t i830_driver_irq_handler(DRM_IRQ_ARGS)
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{
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struct drm_device *dev = (struct drm_device *) arg;
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drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
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u16 temp;
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temp = I830_READ16(I830REG_INT_IDENTITY_R);
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DRM_DEBUG("%x\n", temp);
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if (!(temp & 2))
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return IRQ_NONE;
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I830_WRITE16(I830REG_INT_IDENTITY_R, temp);
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atomic_inc(&dev_priv->irq_received);
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wake_up_interruptible(&dev_priv->irq_queue);
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return IRQ_HANDLED;
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}
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static int i830_emit_irq(struct drm_device *dev)
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{
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drm_i830_private_t *dev_priv = dev->dev_private;
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RING_LOCALS;
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DRM_DEBUG("%s\n", __func__);
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atomic_inc(&dev_priv->irq_emitted);
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BEGIN_LP_RING(2);
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OUT_RING(0);
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OUT_RING(GFX_OP_USER_INTERRUPT);
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ADVANCE_LP_RING();
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return atomic_read(&dev_priv->irq_emitted);
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}
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static int i830_wait_irq(struct drm_device *dev, int irq_nr)
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{
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drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
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DECLARE_WAITQUEUE(entry, current);
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unsigned long end = jiffies + HZ * 3;
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int ret = 0;
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DRM_DEBUG("%s\n", __func__);
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if (atomic_read(&dev_priv->irq_received) >= irq_nr)
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return 0;
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dev_priv->sarea_priv->perf_boxes |= I830_BOX_WAIT;
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add_wait_queue(&dev_priv->irq_queue, &entry);
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for (;;) {
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__set_current_state(TASK_INTERRUPTIBLE);
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if (atomic_read(&dev_priv->irq_received) >= irq_nr)
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break;
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if ((signed)(end - jiffies) <= 0) {
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DRM_ERROR("timeout iir %x imr %x ier %x hwstam %x\n",
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I830_READ16(I830REG_INT_IDENTITY_R),
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I830_READ16(I830REG_INT_MASK_R),
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I830_READ16(I830REG_INT_ENABLE_R),
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I830_READ16(I830REG_HWSTAM));
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ret = -EBUSY; /* Lockup? Missed irq? */
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break;
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}
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schedule_timeout(HZ * 3);
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if (signal_pending(current)) {
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ret = -EINTR;
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break;
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}
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}
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__set_current_state(TASK_RUNNING);
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remove_wait_queue(&dev_priv->irq_queue, &entry);
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return ret;
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}
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/* Needs the lock as it touches the ring.
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*/
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int i830_irq_emit(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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drm_i830_private_t *dev_priv = dev->dev_private;
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drm_i830_irq_emit_t *emit = data;
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int result;
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LOCK_TEST_WITH_RETURN(dev, file_priv);
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if (!dev_priv) {
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DRM_ERROR("%s called with no initialization\n", __func__);
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return -EINVAL;
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}
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result = i830_emit_irq(dev);
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if (copy_to_user(emit->irq_seq, &result, sizeof(int))) {
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DRM_ERROR("copy_to_user\n");
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return -EFAULT;
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}
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return 0;
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}
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/* Doesn't need the hardware lock.
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*/
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int i830_irq_wait(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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drm_i830_private_t *dev_priv = dev->dev_private;
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drm_i830_irq_wait_t *irqwait = data;
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if (!dev_priv) {
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DRM_ERROR("%s called with no initialization\n", __func__);
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return -EINVAL;
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}
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return i830_wait_irq(dev, irqwait->irq_seq);
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}
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/* drm_dma.h hooks
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*/
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void i830_driver_irq_preinstall(struct drm_device *dev)
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{
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drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
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I830_WRITE16(I830REG_HWSTAM, 0xffff);
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I830_WRITE16(I830REG_INT_MASK_R, 0x0);
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I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
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atomic_set(&dev_priv->irq_received, 0);
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atomic_set(&dev_priv->irq_emitted, 0);
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init_waitqueue_head(&dev_priv->irq_queue);
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}
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void i830_driver_irq_postinstall(struct drm_device *dev)
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{
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drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
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I830_WRITE16(I830REG_INT_ENABLE_R, 0x2);
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}
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void i830_driver_irq_uninstall(struct drm_device *dev)
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{
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drm_i830_private_t *dev_priv = (drm_i830_private_t *) dev->dev_private;
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if (!dev_priv)
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return;
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I830_WRITE16(I830REG_INT_MASK_R, 0xffff);
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I830_WRITE16(I830REG_INT_ENABLE_R, 0x0);
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}
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