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/* mga_irq.c -- IRQ handling for radeon -*- linux-c -*-
*/
/*
* Copyright (C) The Weather Channel, Inc. 2002. All Rights Reserved.
*
* The Weather Channel (TM) funded Tungsten Graphics to develop the
* initial release of the Radeon 8500 driver under the XFree86 license.
* This notice must be preserved.
*
* 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
* PRECISION INSIGHT 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>
* Eric Anholt <anholt@FreeBSD.org>
*/
#include <drm/drmP.h>
#include <drm/mga_drm.h>
#include "mga_drv.h"
u32 mga_get_vblank_counter(struct drm_device *dev, int crtc)
{
const drm_mga_private_t *const dev_priv =
(drm_mga_private_t *) dev->dev_private;
if (crtc != 0)
return 0;
return atomic_read(&dev_priv->vbl_received);
}
irqreturn_t mga_driver_irq_handler(int irq, void *arg)
{
struct drm_device *dev = (struct drm_device *) arg;
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
int status;
int handled = 0;
status = MGA_READ(MGA_STATUS);
/* VBLANK interrupt */
if (status & MGA_VLINEPEN) {
MGA_WRITE(MGA_ICLEAR, MGA_VLINEICLR);
atomic_inc(&dev_priv->vbl_received);
drm_handle_vblank(dev, 0);
handled = 1;
}
/* SOFTRAP interrupt */
if (status & MGA_SOFTRAPEN) {
const u32 prim_start = MGA_READ(MGA_PRIMADDRESS);
const u32 prim_end = MGA_READ(MGA_PRIMEND);
MGA_WRITE(MGA_ICLEAR, MGA_SOFTRAPICLR);
/* In addition to clearing the interrupt-pending bit, we
* have to write to MGA_PRIMEND to re-start the DMA operation.
*/
if ((prim_start & ~0x03) != (prim_end & ~0x03))
MGA_WRITE(MGA_PRIMEND, prim_end);
atomic_inc(&dev_priv->last_fence_retired);
wake_up(&dev_priv->fence_queue);
handled = 1;
}
if (handled)
return IRQ_HANDLED;
return IRQ_NONE;
}
int mga_enable_vblank(struct drm_device *dev, int crtc)
{
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
if (crtc != 0) {
DRM_ERROR("tried to enable vblank on non-existent crtc %d\n",
crtc);
return 0;
}
MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN);
return 0;
}
void mga_disable_vblank(struct drm_device *dev, int crtc)
{
if (crtc != 0) {
DRM_ERROR("tried to disable vblank on non-existent crtc %d\n",
crtc);
}
/* Do *NOT* disable the vertical refresh interrupt. MGA doesn't have
* a nice hardware counter that tracks the number of refreshes when
* the interrupt is disabled, and the kernel doesn't know the refresh
* rate to calculate an estimate.
*/
/* MGA_WRITE(MGA_IEN, MGA_VLINEIEN | MGA_SOFTRAPEN); */
}
int mga_driver_fence_wait(struct drm_device *dev, unsigned int *sequence)
{
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
unsigned int cur_fence;
int ret = 0;
/* Assume that the user has missed the current sequence number
* by about a day rather than she wants to wait for years
* using fences.
*/
DRM_WAIT_ON(ret, dev_priv->fence_queue, 3 * HZ,
(((cur_fence = atomic_read(&dev_priv->last_fence_retired))
- *sequence) <= (1 << 23)));
*sequence = cur_fence;
return ret;
}
void mga_driver_irq_preinstall(struct drm_device *dev)
{
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
/* Disable *all* interrupts */
MGA_WRITE(MGA_IEN, 0);
/* Clear bits if they're already high */
MGA_WRITE(MGA_ICLEAR, ~0);
}
int mga_driver_irq_postinstall(struct drm_device *dev)
{
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
init_waitqueue_head(&dev_priv->fence_queue);
/* Turn on soft trap interrupt. Vertical blank interrupts are enabled
* in mga_enable_vblank.
*/
MGA_WRITE(MGA_IEN, MGA_SOFTRAPEN);
return 0;
}
void mga_driver_irq_uninstall(struct drm_device *dev)
{
drm_mga_private_t *dev_priv = (drm_mga_private_t *) dev->dev_private;
if (!dev_priv)
return;
/* Disable *all* interrupts */
MGA_WRITE(MGA_IEN, 0);
dev->irq_enabled = false;
}
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