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/**

 * \file drm_irq.c

 * IRQ support

 *

 * \author Rickard E. (Rik) Faith 

 * \author Gareth Hughes 

 */

/*

 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com

 *

 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.

 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.

 * 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

 * VA LINUX SYSTEMS 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.

 */

#include 

#include 

//#include "drm_trace.h"

//#include    /* For task queue support */

#include 

//#include 

#include 

/* Access macro for slots in vblank timestamp ringbuffer. */

#define vblanktimestamp(dev, crtc, count) ( \

	(dev)->_vblank_time[(crtc) * DRM_VBLANKTIME_RBSIZE + \

	((count) % DRM_VBLANKTIME_RBSIZE)])

/* Retry timestamp calculation up to 3 times to satisfy

 * drm_timestamp_precision before giving up.

 */

#define DRM_TIMESTAMP_MAXRETRIES 3

/* Threshold in nanoseconds for detection of redundant

 * vblank irq in drm_handle_vblank(). 1 msec should be ok.

 */

#define DRM_REDUNDANT_VBLIRQ_THRESH_NS 1000000

static inline u64 div_u64(u64 dividend, u32 divisor)

{

        u32 remainder;

        return div_u64_rem(dividend, divisor, &remainder);

}

u64 div64_u64(u64 dividend, u64 divisor)

{

        u32 high, d;

        high = divisor >> 32;

        if (high) {

                unsigned int shift = fls(high);

                d = divisor >> shift;

                dividend >>= shift;

        } else

                d = divisor;

        return div_u64(dividend, d);

}

/**

 * drm_calc_timestamping_constants - Calculate and

 * store various constants which are later needed by

 * vblank and swap-completion timestamping, e.g, by

 * drm_calc_vbltimestamp_from_scanoutpos().

 * They are derived from crtc's true scanout timing,

 * so they take things like panel scaling or other

 * adjustments into account.

 *

 * @crtc drm_crtc whose timestamp constants should be updated.

 *

 */

void drm_calc_timestamping_constants(struct drm_crtc *crtc)

{

	s64 linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;

	u64 dotclock;

	/* Dot clock in Hz: */

	dotclock = (u64) crtc->hwmode.clock * 1000;

	/* Fields of interlaced scanout modes are only halve a frame duration.

	 * Double the dotclock to get halve the frame-/line-/pixelduration.

	 */

	if (crtc->hwmode.flags & DRM_MODE_FLAG_INTERLACE)

		dotclock *= 2;

	/* Valid dotclock? */

	if (dotclock > 0) {

		int frame_size;

		/* Convert scanline length in pixels and video dot clock to

		 * line duration, frame duration and pixel duration in

		 * nanoseconds:

		 */

		pixeldur_ns = (s64) div64_u64(1000000000, dotclock);

		linedur_ns  = (s64) div64_u64(((u64) crtc->hwmode.crtc_htotal *

					      1000000000), dotclock);

		frame_size = crtc->hwmode.crtc_htotal *

				crtc->hwmode.crtc_vtotal;

		framedur_ns = (s64) div64_u64((u64) frame_size * 1000000000,

					      dotclock);

	} else

		DRM_ERROR("crtc %d: Can't calculate constants, dotclock = 0!\n",

			  crtc->base.id);

	crtc->pixeldur_ns = pixeldur_ns;

	crtc->linedur_ns  = linedur_ns;

	crtc->framedur_ns = framedur_ns;

	DRM_DEBUG("crtc %d: hwmode: htotal %d, vtotal %d, vdisplay %d\n",

		  crtc->base.id, crtc->hwmode.crtc_htotal,

		  crtc->hwmode.crtc_vtotal, crtc->hwmode.crtc_vdisplay);

	DRM_DEBUG("crtc %d: clock %d kHz framedur %d linedur %d, pixeldur %d\n",

		  crtc->base.id, (int) dotclock/1000, (int) framedur_ns,

		  (int) linedur_ns, (int) pixeldur_ns);

}

/**

 * drm_vblank_pre_modeset - account for vblanks across mode sets

 * @dev: DRM device

 * @crtc: CRTC in question

 *

 * Account for vblank events across mode setting events, which will likely

 * reset the hardware frame counter.

 */

void drm_vblank_pre_modeset(struct drm_device *dev, int crtc)

{

#if 0

    /* vblank is not initialized (IRQ not installed ?) */

    if (!dev->num_crtcs)

        return;

    /*

     * To avoid all the problems that might happen if interrupts

     * were enabled/disabled around or between these calls, we just

     * have the kernel take a reference on the CRTC (just once though

     * to avoid corrupting the count if multiple, mismatch calls occur),

     * so that interrupts remain enabled in the interim.

     */

    if (!dev->vblank_inmodeset[crtc]) {

        dev->vblank_inmodeset[crtc] = 0x1;

        if (drm_vblank_get(dev, crtc) == 0)

            dev->vblank_inmodeset[crtc] |= 0x2;

    }

#endif

}

EXPORT_SYMBOL(drm_vblank_pre_modeset);

void drm_vblank_post_modeset(struct drm_device *dev, int crtc)

{

#if 0

    unsigned long irqflags;

    if (dev->vblank_inmodeset[crtc]) {

        spin_lock_irqsave(&dev->vbl_lock, irqflags);

        dev->vblank_disable_allowed = 1;

        spin_unlock_irqrestore(&dev->vbl_lock, irqflags);

        if (dev->vblank_inmodeset[crtc] & 0x2)

            drm_vblank_put(dev, crtc);

        dev->vblank_inmodeset[crtc] = 0;

    }

#endif

}

EXPORT_SYMBOL(drm_vblank_post_modeset);