diff options
Diffstat (limited to 'drivers/gpu/drm/i830/i830_irq.c')
| -rw-r--r-- | drivers/gpu/drm/i830/i830_irq.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i830/i830_irq.c b/drivers/gpu/drm/i830/i830_irq.c new file mode 100644 index 0000000..91ec2bb --- /dev/null +++ b/drivers/gpu/drm/i830/i830_irq.c @@ -0,0 +1,186 @@ +/* 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); +} |
