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 <drm/drmP.h>
 34#include <drm/r128_drm.h>
 35#include "r128_drv.h"
 36
 37u32 r128_get_vblank_counter(struct drm_device *dev, unsigned int pipe)
 38{
 39	const drm_r128_private_t *dev_priv = dev->dev_private;
 40
 41	if (pipe != 0)
 42		return 0;
 43
 44	return atomic_read(&dev_priv->vbl_received);
 45}
 46
 47irqreturn_t r128_driver_irq_handler(int irq, void *arg)
 48{
 49	struct drm_device *dev = (struct drm_device *) arg;
 50	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
 51	int status;
 52
 53	status = R128_READ(R128_GEN_INT_STATUS);
 54
 55	/* VBLANK interrupt */
 56	if (status & R128_CRTC_VBLANK_INT) {
 57		R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
 58		atomic_inc(&dev_priv->vbl_received);
 59		drm_handle_vblank(dev, 0);
 60		return IRQ_HANDLED;
 61	}
 62	return IRQ_NONE;
 63}
 64
 65int r128_enable_vblank(struct drm_device *dev, unsigned int pipe)
 66{
 67	drm_r128_private_t *dev_priv = dev->dev_private;
 68
 69	if (pipe != 0) {
 70		DRM_ERROR("%s:  bad crtc %u\n", __func__, pipe);
 71		return -EINVAL;
 72	}
 73
 74	R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
 75	return 0;
 76}
 77
 78void r128_disable_vblank(struct drm_device *dev, unsigned int pipe)
 79{
 80	if (pipe != 0)
 81		DRM_ERROR("%s:  bad crtc %u\n", __func__, pipe);
 82
 83	/*
 84	 * FIXME: implement proper interrupt disable by using the vblank
 85	 * counter register (if available)
 86	 *
 87	 * R128_WRITE(R128_GEN_INT_CNTL,
 88	 *            R128_READ(R128_GEN_INT_CNTL) & ~R128_CRTC_VBLANK_INT_EN);
 89	 */
 90}
 91
 92void r128_driver_irq_preinstall(struct drm_device *dev)
 93{
 94	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
 95
 96	/* Disable *all* interrupts */
 97	R128_WRITE(R128_GEN_INT_CNTL, 0);
 98	/* Clear vblank bit if it's already high */
 99	R128_WRITE(R128_GEN_INT_STATUS, R128_CRTC_VBLANK_INT_AK);
100}
101
102int r128_driver_irq_postinstall(struct drm_device *dev)
103{
104	return 0;
105}
106
107void r128_driver_irq_uninstall(struct drm_device *dev)
108{
109	drm_r128_private_t *dev_priv = (drm_r128_private_t *) dev->dev_private;
110	if (!dev_priv)
111		return;
112
113	/* Disable *all* interrupts */
114	R128_WRITE(R128_GEN_INT_CNTL, 0);
115}