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/* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-

 */

/*

 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.

 * 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, sub license, 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 NON-INFRINGEMENT.

 * IN NO EVENT SHALL 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.

 *

 */

#include 

//#include 

#include "drmP.h"

#include "drm.h"

#include "i915_drm.h"

#include "i915_drv.h"

#include "i915_trace.h"

#include "intel_drv.h"

#define MAX_NOPID ((u32)~0)

/**

 * Interrupts that are always left unmasked.

 *

 * Since pipe events are edge-triggered from the PIPESTAT register to IIR,

 * we leave them always unmasked in IMR and then control enabling them through

 * PIPESTAT alone.

 */

#define I915_INTERRUPT_ENABLE_FIX			\

	(I915_ASLE_INTERRUPT |				\

	 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |		\

	 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |		\

	 I915_DISPLAY_PLANE_A_FLIP_PENDING_INTERRUPT |	\

	 I915_DISPLAY_PLANE_B_FLIP_PENDING_INTERRUPT |	\

	 I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)

/** Interrupts that we mask and unmask at runtime. */

#define I915_INTERRUPT_ENABLE_VAR (I915_USER_INTERRUPT | I915_BSD_USER_INTERRUPT)

#define I915_PIPE_VBLANK_STATUS	(PIPE_START_VBLANK_INTERRUPT_STATUS |\

				 PIPE_VBLANK_INTERRUPT_STATUS)

#define I915_PIPE_VBLANK_ENABLE	(PIPE_START_VBLANK_INTERRUPT_ENABLE |\

				 PIPE_VBLANK_INTERRUPT_ENABLE)

#define DRM_I915_VBLANK_PIPE_ALL	(DRM_I915_VBLANK_PIPE_A | \

					 DRM_I915_VBLANK_PIPE_B)

/* For display hotplug interrupt */

static void

ironlake_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)

{

    if ((dev_priv->irq_mask & mask) != 0) {

        dev_priv->irq_mask &= ~mask;

        I915_WRITE(DEIMR, dev_priv->irq_mask);

        POSTING_READ(DEIMR);

    }

}

static inline void

ironlake_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)

{

    if ((dev_priv->irq_mask & mask) != mask) {

        dev_priv->irq_mask |= mask;

        I915_WRITE(DEIMR, dev_priv->irq_mask);

        POSTING_READ(DEIMR);

    }

}

static int ironlake_irq_handler(struct drm_device *dev)

{

    drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

    int ret = IRQ_NONE;

    u32 de_iir, gt_iir, de_ier, pch_iir, pm_iir;

    u32 hotplug_mask;

    struct drm_i915_master_private *master_priv;

    u32 bsd_usr_interrupt = GT_BSD_USER_INTERRUPT;

    atomic_inc(&dev_priv->irq_received);

    if (IS_GEN6(dev))

        bsd_usr_interrupt = GT_GEN6_BSD_USER_INTERRUPT;

    /* disable master interrupt before clearing iir  */

    de_ier = I915_READ(DEIER);

    I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);

    POSTING_READ(DEIER);

    de_iir = I915_READ(DEIIR);

    gt_iir = I915_READ(GTIIR);

    pch_iir = I915_READ(SDEIIR);

    pm_iir = I915_READ(GEN6_PMIIR);

    if (de_iir == 0 && gt_iir == 0 && pch_iir == 0 &&

        (!IS_GEN6(dev) || pm_iir == 0))

        goto done;

    if (HAS_PCH_CPT(dev))

        hotplug_mask = SDE_HOTPLUG_MASK_CPT;

    else

        hotplug_mask = SDE_HOTPLUG_MASK;

    ret = IRQ_HANDLED;

//    if (gt_iir & (GT_USER_INTERRUPT | GT_PIPE_NOTIFY))

//        notify_ring(dev, &dev_priv->ring[RCS]);

//    if (gt_iir & bsd_usr_interrupt)

//        notify_ring(dev, &dev_priv->ring[VCS]);

//    if (gt_iir & GT_BLT_USER_INTERRUPT)

//        notify_ring(dev, &dev_priv->ring[BCS]);

//    if (de_iir & DE_GSE)

//        intel_opregion_gse_intr(dev);

//    if (de_iir & DE_PLANEA_FLIP_DONE) {

//        intel_prepare_page_flip(dev, 0);

//        intel_finish_page_flip_plane(dev, 0);

//    }

//    if (de_iir & DE_PLANEB_FLIP_DONE) {

//        intel_prepare_page_flip(dev, 1);

//        intel_finish_page_flip_plane(dev, 1);

//    }

//    if (de_iir & DE_PIPEA_VBLANK)

//        drm_handle_vblank(dev, 0);

//    if (de_iir & DE_PIPEB_VBLANK)

//        drm_handle_vblank(dev, 1);

    /* check event from PCH */

//    if (de_iir & DE_PCH_EVENT) {

//        if (pch_iir & hotplug_mask)

//            queue_work(dev_priv->wq, &dev_priv->hotplug_work);

//        pch_irq_handler(dev);

//    }

//    if (de_iir & DE_PCU_EVENT) {

//        I915_WRITE16(MEMINTRSTS, I915_READ(MEMINTRSTS));

//        i915_handle_rps_change(dev);

//    }

    if (IS_GEN6(dev) && pm_iir & GEN6_PM_DEFERRED_EVENTS) {

        /*

         * IIR bits should never already be set because IMR should

         * prevent an interrupt from being shown in IIR. The warning

         * displays a case where we've unsafely cleared

         * dev_priv->pm_iir. Although missing an interrupt of the same

         * type is not a problem, it displays a problem in the logic.

         *

         * The mask bit in IMR is cleared by rps_work.

         */

        unsigned long flags;

        spin_lock_irqsave(&dev_priv->rps_lock, flags);

        WARN(dev_priv->pm_iir & pm_iir, "Missed a PM interrupt\n");

        dev_priv->pm_iir |= pm_iir;

        I915_WRITE(GEN6_PMIMR, dev_priv->pm_iir);

        POSTING_READ(GEN6_PMIMR);

        spin_unlock_irqrestore(&dev_priv->rps_lock, flags);

//        queue_work(dev_priv->wq, &dev_priv->rps_work);

    }

    /* should clear PCH hotplug event before clear CPU irq */

    I915_WRITE(SDEIIR, pch_iir);

    I915_WRITE(GTIIR, gt_iir);

    I915_WRITE(DEIIR, de_iir);

    I915_WRITE(GEN6_PMIIR, pm_iir);

done:

    I915_WRITE(DEIER, de_ier);

    POSTING_READ(DEIER);

    return ret;

}

/* drm_dma.h hooks

*/

static void ironlake_irq_preinstall(struct drm_device *dev)

{

    drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

    atomic_set(&dev_priv->irq_received, 0);

//    INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);

//    INIT_WORK(&dev_priv->error_work, i915_error_work_func);

//    if (IS_GEN6(dev) || IS_IVYBRIDGE(dev))

//        INIT_WORK(&dev_priv->rps_work, gen6_pm_rps_work);

    I915_WRITE(HWSTAM, 0xeffe);

    if (IS_GEN6(dev)) {

        /* Workaround stalls observed on Sandy Bridge GPUs by

         * making the blitter command streamer generate a

         * write to the Hardware Status Page for

         * MI_USER_INTERRUPT.  This appears to serialize the

         * previous seqno write out before the interrupt

         * happens.

         */

        I915_WRITE(GEN6_BLITTER_HWSTAM, ~GEN6_BLITTER_USER_INTERRUPT);

        I915_WRITE(GEN6_BSD_HWSTAM, ~GEN6_BSD_USER_INTERRUPT);

    }

    /* XXX hotplug from PCH */

    I915_WRITE(DEIMR, 0xffffffff);

    I915_WRITE(DEIER, 0x0);

    POSTING_READ(DEIER);

    /* and GT */

    I915_WRITE(GTIMR, 0xffffffff);

    I915_WRITE(GTIER, 0x0);

    POSTING_READ(GTIER);

    /* south display irq */

    I915_WRITE(SDEIMR, 0xffffffff);

    I915_WRITE(SDEIER, 0x0);

    POSTING_READ(SDEIER);

}

/*

 * Enable digital hotplug on the PCH, and configure the DP short pulse

 * duration to 2ms (which is the minimum in the Display Port spec)

 *

 * This register is the same on all known PCH chips.

 */

static void ironlake_enable_pch_hotplug(struct drm_device *dev)

{

	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

	u32	hotplug;

	hotplug = I915_READ(PCH_PORT_HOTPLUG);

	hotplug &= ~(PORTD_PULSE_DURATION_MASK|PORTC_PULSE_DURATION_MASK|PORTB_PULSE_DURATION_MASK);

	hotplug |= PORTD_HOTPLUG_ENABLE | PORTD_PULSE_DURATION_2ms;

	hotplug |= PORTC_HOTPLUG_ENABLE | PORTC_PULSE_DURATION_2ms;

	hotplug |= PORTB_HOTPLUG_ENABLE | PORTB_PULSE_DURATION_2ms;

	I915_WRITE(PCH_PORT_HOTPLUG, hotplug);

}

static int ironlake_irq_postinstall(struct drm_device *dev)

{

    drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;

    /* enable kind of interrupts always enabled */

    u32 display_mask = DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |

               DE_PLANEA_FLIP_DONE | DE_PLANEB_FLIP_DONE;

    u32 render_irqs;

    u32 hotplug_mask;

//    DRM_INIT_WAITQUEUE(&dev_priv->ring[RCS].irq_queue);

//    if (HAS_BSD(dev))

//        DRM_INIT_WAITQUEUE(&dev_priv->ring[VCS].irq_queue);

//    if (HAS_BLT(dev))

//        DRM_INIT_WAITQUEUE(&dev_priv->ring[BCS].irq_queue);

    dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;

    dev_priv->irq_mask = ~display_mask;

    /* should always can generate irq */

    I915_WRITE(DEIIR, I915_READ(DEIIR));

    I915_WRITE(DEIMR, dev_priv->irq_mask);

    I915_WRITE(DEIER, display_mask | DE_PIPEA_VBLANK | DE_PIPEB_VBLANK);

    POSTING_READ(DEIER);

	dev_priv->gt_irq_mask = ~0;

    I915_WRITE(GTIIR, I915_READ(GTIIR));

    I915_WRITE(GTIMR, dev_priv->gt_irq_mask);

    if (IS_GEN6(dev))

        render_irqs =

            GT_USER_INTERRUPT |

            GT_GEN6_BSD_USER_INTERRUPT |

            GT_BLT_USER_INTERRUPT;

    else

        render_irqs =

            GT_USER_INTERRUPT |

            GT_PIPE_NOTIFY |

            GT_BSD_USER_INTERRUPT;

    I915_WRITE(GTIER, render_irqs);

    POSTING_READ(GTIER);

    if (HAS_PCH_CPT(dev)) {

        hotplug_mask = (SDE_CRT_HOTPLUG_CPT |

                SDE_PORTB_HOTPLUG_CPT |

                SDE_PORTC_HOTPLUG_CPT |

                SDE_PORTD_HOTPLUG_CPT);

    } else {

        hotplug_mask = (SDE_CRT_HOTPLUG |

                SDE_PORTB_HOTPLUG |

                SDE_PORTC_HOTPLUG |

                SDE_PORTD_HOTPLUG |

                SDE_AUX_MASK);

    }

    dev_priv->pch_irq_mask = ~hotplug_mask;

    I915_WRITE(SDEIIR, I915_READ(SDEIIR));

    I915_WRITE(SDEIMR, dev_priv->pch_irq_mask);

    I915_WRITE(SDEIER, hotplug_mask);

    POSTING_READ(SDEIER);

    ironlake_enable_pch_hotplug(dev);

    if (IS_IRONLAKE_M(dev)) {

        /* Clear & enable PCU event interrupts */

        I915_WRITE(DEIIR, DE_PCU_EVENT);

        I915_WRITE(DEIER, I915_READ(DEIER) | DE_PCU_EVENT);

        ironlake_enable_display_irq(dev_priv, DE_PCU_EVENT);

    }

    return 0;

}

void intel_irq_init(struct drm_device *dev)

{

#if 0

	if (IS_IVYBRIDGE(dev)) {

		/* Share pre & uninstall handlers with ILK/SNB */

		dev->driver->irq_handler = ivybridge_irq_handler;

		dev->driver->irq_preinstall = ironlake_irq_preinstall;

		dev->driver->irq_postinstall = ivybridge_irq_postinstall;

		dev->driver->irq_uninstall = ironlake_irq_uninstall;

		dev->driver->enable_vblank = ivybridge_enable_vblank;

		dev->driver->disable_vblank = ivybridge_disable_vblank;

	} else if (HAS_PCH_SPLIT(dev)) {

		dev->driver->irq_handler = ironlake_irq_handler;

		dev->driver->irq_preinstall = ironlake_irq_preinstall;

		dev->driver->irq_postinstall = ironlake_irq_postinstall;

		dev->driver->irq_uninstall = ironlake_irq_uninstall;

		dev->driver->enable_vblank = ironlake_enable_vblank;

		dev->driver->disable_vblank = ironlake_disable_vblank;

	} else {

		dev->driver->irq_preinstall = i915_driver_irq_preinstall;

		dev->driver->irq_postinstall = i915_driver_irq_postinstall;

		dev->driver->irq_uninstall = i915_driver_irq_uninstall;

		dev->driver->irq_handler = i915_driver_irq_handler;

		dev->driver->enable_vblank = i915_enable_vblank;

		dev->driver->disable_vblank = i915_disable_vblank;

	}

#endif

}

static struct drm_device *irq_device;

void irq_handler_kms()

{

//    printf("%s\n",__FUNCTION__);

    ironlake_irq_handler(irq_device);

}

int drm_irq_install(struct drm_device *dev)

{

    int irq_line;

    int ret = 0;

    ENTER();

    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 = 1;

    mutex_unlock(&dev->struct_mutex);

    irq_device = dev;

    irq_line   = drm_dev_to_irq(dev);

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

    ironlake_irq_preinstall(dev);

    ret = AttachIntHandler(irq_line, irq_handler_kms, 2);

    if (ret == 0) {

        mutex_lock(&dev->struct_mutex);

        dev->irq_enabled = 0;

        mutex_unlock(&dev->struct_mutex);

        return ret;

    }

    ret = ironlake_irq_postinstall(dev);

//    if (ret < 0) {

//        mutex_lock(&dev->struct_mutex);

//        dev->irq_enabled = 0;

//        mutex_unlock(&dev->struct_mutex);

//        free_irq(drm_dev_to_irq(dev), dev);

//    }

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

    cmd&= ~(1<<10);

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

    dbgprintf("PCI_CMD: %04x\n", cmd);

    DRM_INFO("i915: irq initialized.\n");

    LEAVE();

    return ret;

}