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authorFelix Kuehling <fxkuehl@gmx.de>2004-09-22 22:51:18 +0000
committerFelix Kuehling <fxkuehl@gmx.de>2004-09-22 22:51:18 +0000
commitaf326f6f0c26191b4aef2183fb485e58495b29a5 (patch)
tree5f107ae2a9aa33ea5bc971618bf8e84824b89770 /bsd/.cvsignore
parent27fc998f7d16e7197f38b2d7d1ce65938e06423d (diff)
Create permanent maps of framebuffer, aperture and MMIO registers. Added
chipset-type information in driver data field of Savage PCI-IDs. Added missing PCI-ID 0x8d03 (ProSavageDDR on Pentium boards). Don't require AGP.
Diffstat (limited to 'bsd/.cvsignore')
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generated by cgit v1.2.3 (git 2.25.1) at 2025-07-05 14:09:44 +0000
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/* via_irq.c
 *
 * Copyright 2004 BEAM Ltd.
 * 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
 * BEAM LTD, 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: 
 *    Terry Barnaby <terry1@beam.ltd.uk>
 *    Keith Whitwell <keith@tungstengraphics.com>
 *
 *
 * This code provides standard DRM access to the Via CLE266's Vertical blank
 * interrupt.
 */

#include "via.h"
#include "drmP.h"
#include "drm.h"
#include "via_drm.h"
#include "via_drv.h"

#define VIA_REG_INTERRUPT       0x200

/* VIA_REG_INTERRUPT */
#define VIA_IRQ_GLOBAL          (1 << 31)
#define VIA_IRQ_VBI_ENABLE      (1 << 19)
#define VIA_IRQ_VBI_PENDING     (1 << 3)



static unsigned time_diff(struct timeval *now,struct timeval *then) 
{
    return (now->tv_usec >= then->tv_usec) ?
        now->tv_usec - then->tv_usec :
        1000000 - (then->tv_usec - now->tv_usec);
}

irqreturn_t via_driver_irq_handler(DRM_IRQ_ARGS)
{
	drm_device_t *dev = (drm_device_t *) arg;
	drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
	u32 status;
	int handled = 0;
	struct timeval cur_vblank;

	status = VIA_READ(VIA_REG_INTERRUPT);
	if (status & VIA_IRQ_VBI_PENDING) {
		atomic_inc(&dev->vbl_received);
                if (!(atomic_read(&dev->vbl_received) & 0x0F)) {
			do_gettimeofday(&cur_vblank);
                        if (dev_priv->last_vblank_valid) {
				dev_priv->usec_per_vblank = 
					time_diff( &cur_vblank,&dev_priv->last_vblank) >> 4;
			}
			dev_priv->last_vblank = cur_vblank;
			dev_priv->last_vblank_valid = 1;
                }
                if (!(atomic_read(&dev->vbl_received) & 0xFF)) {
			DRM_DEBUG("US per vblank is: %u\n",
				dev_priv->usec_per_vblank);
		}
		DRM_WAKEUP(&dev->vbl_queue);
		DRM(vbl_send_signals) (dev);
		handled = 1;
	}

	/* Acknowlege interrupts ?? */
	VIA_WRITE(VIA_REG_INTERRUPT, status);

	if (handled)
		return IRQ_HANDLED;
	else
		return IRQ_NONE;
}