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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[crtc].time[(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

irqreturn_t device_irq_handler(struct drm_device *dev)

{

//    printf("video irq\n");

//    printf("device %p driver %p handler %p\n", dev, dev->driver, dev->driver->irq_handler) ;

    return dev->driver->irq_handler(0, dev);

}

/**

 * Install IRQ handler.

 *

 * \param dev DRM device.

 *

 * Initializes the IRQ related data. Installs the handler, calling the driver

 * \c irq_preinstall() and \c irq_postinstall() functions

 * before and after the installation.

 */

int drm_irq_install(struct drm_device *dev)

{

	int ret;

    unsigned long sh_flags = 0;

	char *irqname;

	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))

		return -EINVAL;

	if (drm_dev_to_irq(dev) == 0)

		return -EINVAL;

    mutex_lock(&dev->struct_mutex);

    /* Driver must have been initialized */

    if (!dev->dev_private) {

            mutex_unlock(&dev->struct_mutex);

            return -EINVAL;

    }

    if (dev->irq_enabled) {

            mutex_unlock(&dev->struct_mutex);

            return -EBUSY;

    }

	dev->irq_enabled = true;

    mutex_unlock(&dev->struct_mutex);

    DRM_DEBUG("irq=%d\n", drm_dev_to_irq(dev));

    /* Before installing handler */

    if (dev->driver->irq_preinstall)

            dev->driver->irq_preinstall(dev);

    ret = !AttachIntHandler(drm_dev_to_irq(dev), device_irq_handler, (u32)dev);

    /* After installing handler */

    if (dev->driver->irq_postinstall)

            ret = dev->driver->irq_postinstall(dev);

    if (ret < 0) {

		dev->irq_enabled = 0;

        DRM_ERROR(__FUNCTION__);

    }

    u16_t cmd = PciRead16(dev->pdev->busnr, dev->pdev->devfn, 4);

    cmd&= ~(1<<10);

    PciWrite16(dev->pdev->busnr, dev->pdev->devfn, 4, cmd);

    return ret;

}

EXPORT_SYMBOL(drm_irq_install);

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 vblank timestamp constants

 *

 * @crtc drm_crtc whose timestamp constants should be updated.

 * @mode display mode containing the scanout timings

 *

 * 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.

 */

void drm_calc_timestamping_constants(struct drm_crtc *crtc,

				     const struct drm_display_mode *mode)

{

	int linedur_ns = 0, pixeldur_ns = 0, framedur_ns = 0;

	int dotclock = mode->crtc_clock;

	/* Valid dotclock? */

	if (dotclock > 0) {

		int frame_size = mode->crtc_htotal * mode->crtc_vtotal;

		/*

		 * Convert scanline length in pixels and video

		 * dot clock to line duration, frame duration

		 * and pixel duration in nanoseconds:

	 */

		pixeldur_ns = 1000000 / dotclock;

		linedur_ns  = div_u64((u64) mode->crtc_htotal * 1000000, dotclock);

		framedur_ns = div_u64((u64) frame_size * 1000000, dotclock);

		/*

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

		 */

		if (mode->flags & DRM_MODE_FLAG_INTERLACE)

			framedur_ns /= 2;

	} 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, mode->crtc_htotal,

		  mode->crtc_vtotal, mode->crtc_vdisplay);

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

		  crtc->base.id, dotclock, framedur_ns,

		  linedur_ns, pixeldur_ns);

}

EXPORT_SYMBOL(drm_calc_timestamping_constants);

/**

 * drm_calc_vbltimestamp_from_scanoutpos - helper routine for kms

 * drivers. Implements calculation of exact vblank timestamps from

 * given drm_display_mode timings and current video scanout position

 * of a crtc. This can be called from within get_vblank_timestamp()

 * implementation of a kms driver to implement the actual timestamping.

 *

 * Should return timestamps conforming to the OML_sync_control OpenML

 * extension specification. The timestamp corresponds to the end of

 * the vblank interval, aka start of scanout of topmost-leftmost display

 * pixel in the following video frame.

 *

 * Requires support for optional dev->driver->get_scanout_position()

 * in kms driver, plus a bit of setup code to provide a drm_display_mode

 * that corresponds to the true scanout timing.

 *

 * The current implementation only handles standard video modes. It

 * returns as no operation if a doublescan or interlaced video mode is

 * active. Higher level code is expected to handle this.

 *

 * @dev: DRM device.

 * @crtc: Which crtc's vblank timestamp to retrieve.

 * @max_error: Desired maximum allowable error in timestamps (nanosecs).

 *             On return contains true maximum error of timestamp.

 * @vblank_time: Pointer to struct timeval which should receive the timestamp.

 * @flags: Flags to pass to driver:

 *         0 = Default.

 *         DRM_CALLED_FROM_VBLIRQ = If function is called from vbl irq handler.

 * @refcrtc: drm_crtc* of crtc which defines scanout timing.

 * @mode: mode which defines the scanout timings

 *

 * Returns negative value on error, failure or if not supported in current

 * video mode:

 *

 * -EINVAL   - Invalid crtc.

 * -EAGAIN   - Temporary unavailable, e.g., called before initial modeset.

 * -ENOTSUPP - Function not supported in current display mode.

 * -EIO      - Failed, e.g., due to failed scanout position query.

 *

 * Returns or'ed positive status flags on success:

 *

 * DRM_VBLANKTIME_SCANOUTPOS_METHOD - Signal this method used for timestamping.

 * DRM_VBLANKTIME_INVBL - Timestamp taken while scanout was in vblank interval.

 *

 */

int drm_calc_vbltimestamp_from_scanoutpos(struct drm_device *dev, int crtc,

					  int *max_error,

					  struct timeval *vblank_time,

					  unsigned flags,

					  const struct drm_crtc *refcrtc,

					  const struct drm_display_mode *mode)

{

	struct timeval tv_etime;

	int vbl_status;

	int vpos, hpos, i;

	int framedur_ns, linedur_ns, pixeldur_ns, delta_ns, duration_ns;

	bool invbl;

	if (crtc < 0 || crtc >= dev->num_crtcs) {

		DRM_ERROR("Invalid crtc %d\n", crtc);

		return -EINVAL;

	}

	/* Scanout position query not supported? Should not happen. */

	if (!dev->driver->get_scanout_position) {

		DRM_ERROR("Called from driver w/o get_scanout_position()!?\n");

		return -EIO;

	}

	/* Durations of frames, lines, pixels in nanoseconds. */

	framedur_ns = refcrtc->framedur_ns;

	linedur_ns  = refcrtc->linedur_ns;

	pixeldur_ns = refcrtc->pixeldur_ns;

	/* If mode timing undefined, just return as no-op:

	 * Happens during initial modesetting of a crtc.

	 */

	if (framedur_ns == 0) {

		DRM_DEBUG("crtc %d: Noop due to uninitialized mode.\n", crtc);

		return -EAGAIN;

	}

	return -EIO;

}

EXPORT_SYMBOL(drm_calc_vbltimestamp_from_scanoutpos);

/**

 * 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[crtc].inmodeset) {

		dev->vblank[crtc].inmodeset = 0x1;

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

			dev->vblank[crtc].inmodeset |= 0x2;

    }

#endif

}

EXPORT_SYMBOL(drm_vblank_pre_modeset);

void drm_vblank_post_modeset(struct drm_device *dev, int crtc)

{

#if 0

    unsigned long irqflags;

	/* vblank is not initialized (IRQ not installed ?), or has been freed */

	if (!dev->num_crtcs)

		return;

	if (dev->vblank[crtc].inmodeset) {

        spin_lock_irqsave(&dev->vbl_lock, irqflags);

		dev->vblank_disable_allowed = true;

        spin_unlock_irqrestore(&dev->vbl_lock, irqflags);

		if (dev->vblank[crtc].inmodeset & 0x2)

            drm_vblank_put(dev, crtc);

		dev->vblank[crtc].inmodeset = 0;

    }

#endif

}

EXPORT_SYMBOL(drm_vblank_post_modeset);