1/* r128_irq.c -- IRQ handling for radeon -*- linux-c -*- */
  2/*
  3 * Copyright (C) The Weather Channel, Inc.  2002.  All Rights Reserved.
  4 *
  5 * The Weather Channel (TM) funded Tungsten Graphics to develop the
  6 * initial release of the Radeon 8500 driver under the XFree86 license.
  7 * This notice must be preserved.
  8 *
  9 * Permission is hereby granted, free of charge, to any person obtaining a
 10 * copy of this software and associated documentation files (the "Software"),
 11 * to deal in the Software without restriction, including without limitation
 12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 13 * and/or sell copies of the Software, and to permit persons to whom the
 14 * Software is furnished to do so, subject to the following conditions:
 15 *
 16 * The above copyright notice and this permission notice (including the next
 17 * paragraph) shall be included in all copies or substantial portions of the
 18 * Software.
 19 *
 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 23 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 26 * DEALINGS IN THE SOFTWARE.
 27 *
 28 * Authors:
 29 *    Keith Whitwell <keith@tungstengraphics.com>
 30 *    Eric Anholt <anholt@FreeBSD.org>
 31 */
 32
 33#include "drmP.h"
 34#include "drm.h"
 35#include "r128_drm.h"
 36#include "r128_drv.h"
 37
 38u32 r128_get_vblank_counter(struct drm_device *dev, int crtc)
 39{
 40	const drm_r128_private_t *dev_priv = dev->dev_private;
 41
 42	if (crtc != 0)
 43		return 0;
 44
 45	return atomic_read(&dev_priv->vbl_received);
 46}
 47
 48irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
 49{
 50	struct drm_device *dev = (struct drm_device *) arg;
 51	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
 52	int status;
 53
 54	status = R128_READ(R128_GEN_INT_STATUS);
 55
 56	/* VBLANK interrupt */
 57	if (status & R128_CRTC_VBLANK_INT) {
 58		R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
 59		atomic_inc(&dev_priv->vbl_received);
 60		drm_handle_vblank(dev, 0);
 61		return IRQ_HANDLED;
 62	}
 63	return IRQ_NONE;
 64}
 65
 66int r128_enable_vblank(struct drm_device *dev, int crtc)
 67{
 68	drm_r128_private_t *dev_priv = dev->dev_private;
 69
 70	if (crtc != 0) {
 71		DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
 72		return -EINVAL;
 73	}
 74
 75	R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
 76	return 0;
 77}
 78
 79void r128_disable_vblank(struct drm_device *dev, int crtc)
 80{
 81	if (crtc != 0)
 82		DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
 83
 84	/*
 85	 * FIXME: implement proper interrupt disable by using the vblank
 86	 * counter register (if available)
 87	 *
 88	 * R128_WRITE(R128_GEN_INT_CNTL,
 89	 *            R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN);
 90	 */
 91}
 92
 93void r128_driver_irq_preinstall(struct drm_device *dev)
 94{
 95	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
 96
 97	/* Disable *all* interrupts */
 98	R128_WRITE(R128_GEN_INT_CNTL, 0);
 99	/* Clear vblank bit if it's already high */
100	R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
101}
102
103int r128_driver_irq_postinstall(struct drm_device *dev)
104{
105	return 0;
106}
107
108void r128_driver_irq_uninstall(struct drm_device *dev)
109{
110	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
111	if (!dev_priv)
112		return;
113
114	/* Disable *all* interrupts */
115	R128_WRITE(R128_GEN_INT_CNTL, 0);
116}