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r128_irq.c revision 1.1.1.1 
      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 (at) tungstengraphics.com>
     30  *    Eric Anholt <anholt (at) FreeBSD.org>
     31  */
     32 
     33 #include <drm/drmP.h>
     34 #include <drm/r128_drm.h>
     35 #include "r128_drv.h"
     36 
     37 u32 r128_get_vblank_counter(struct drm_device *dev, int crtc)
     38 {
     39 	const drm_r128_private_t *dev_priv = dev->dev_private;
     40 
     41 	if (crtc != 0)
     42 		return 0;
     43 
     44 	return atomic_read(&dev_priv->vbl_received);
     45 }
     46 
     47 irqreturn_t r128_driver_irq_handler(DRM_IRQ_ARGS)
     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 
     65 int r128_enable_vblank(struct drm_device *dev, int crtc)
     66 {
     67 	drm_r128_private_t *dev_priv = dev->dev_private;
     68 
     69 	if (crtc != 0) {
     70 		DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
     71 		return -EINVAL;
     72 	}
     73 
     74 	R128_WRITE(R128_GEN_INT_CNTL, R128_CRTC_VBLANK_INT_EN);
     75 	return 0;
     76 }
     77 
     78 void r128_disable_vblank(struct drm_device *dev, int crtc)
     79 {
     80 	if (crtc != 0)
     81 		DRM_ERROR("%s:  bad crtc %d\n", __func__, crtc);
     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 
     92 void 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 
    102 int r128_driver_irq_postinstall(struct drm_device *dev)
    103 {
    104 	return 0;
    105 }
    106 
    107 void 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 }
    116