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via_irq.c

/* via_irq.c
 *
 * Copyright 2004 BEAM Ltd.
 * Copyright 2002 Tungsten Graphics, Inc.
 * Copyright 2005 Thomas Hellstrom.
 * 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>
 *    Thomas Hellstrom <unichrome@shipmail.org>
 *
 * This code provides standard DRM access to the Via Unichrome / Pro Vertical blank
 * interrupt, as well as an infrastructure to handle other interrupts of the chip.
 * The refresh rate is also calculated for video playback sync purposes.
 */

#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_VBLANK_ENABLE   (1 << 19)
#define VIA_IRQ_VBLANK_PENDING  (1 << 3)
#define VIA_IRQ_HQV0_ENABLE     (1 << 11)
#define VIA_IRQ_HQV1_ENABLE     (1 << 25)
#define VIA_IRQ_HQV0_PENDING    (1 << 9)
#define VIA_IRQ_HQV1_PENDING    (1 << 10)
#define VIA_IRQ_DMA0_DD_ENABLE  (1 << 20)
#define VIA_IRQ_DMA0_TD_ENABLE  (1 << 21)
#define VIA_IRQ_DMA1_DD_ENABLE  (1 << 22)
#define VIA_IRQ_DMA1_TD_ENABLE  (1 << 23)
#define VIA_IRQ_DMA0_DD_PENDING (1 << 4)
#define VIA_IRQ_DMA0_TD_PENDING (1 << 5)
#define VIA_IRQ_DMA1_DD_PENDING (1 << 6)
#define VIA_IRQ_DMA1_TD_PENDING (1 << 7)


/*
 * Device-specific IRQs go here. This type might need to be extended with
 * the register if there are multiple IRQ control registers.
 * Currently we activate the HQV interrupts of  Unichrome Pro group A.
 */

static maskarray_t via_pro_group_a_irqs[] = {
      {VIA_IRQ_HQV0_ENABLE, VIA_IRQ_HQV0_PENDING, 0x000003D0, 0x00008010,
       0x00000000},
      {VIA_IRQ_HQV1_ENABLE, VIA_IRQ_HQV1_PENDING, 0x000013D0, 0x00008010,
       0x00000000},
      {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0,
       VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
      {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1,
       VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
};
static int via_num_pro_group_a =
    sizeof(via_pro_group_a_irqs) / sizeof(maskarray_t);
static int via_irqmap_pro_group_a[] = {0, 1, -1, 2, -1, 3};

static maskarray_t via_unichrome_irqs[] = {
      {VIA_IRQ_DMA0_TD_ENABLE, VIA_IRQ_DMA0_TD_PENDING, VIA_PCI_DMA_CSR0,
       VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008},
      {VIA_IRQ_DMA1_TD_ENABLE, VIA_IRQ_DMA1_TD_PENDING, VIA_PCI_DMA_CSR1,
       VIA_DMA_CSR_TA | VIA_DMA_CSR_TD, 0x00000008}
};
static int via_num_unichrome = sizeof(via_unichrome_irqs) / sizeof(maskarray_t);
static int via_irqmap_unichrome[] = {-1, -1, -1, 0, -1, 1};

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)
{
      struct drm_device *dev = (struct drm_device *) arg;
      drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
      u32 status;
      int handled = 0;
      struct timeval cur_vblank;
      drm_via_irq_t *cur_irq = dev_priv->via_irqs;
      int i;

      status = VIA_READ(VIA_REG_INTERRUPT);
      if (status & VIA_IRQ_VBLANK_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;
      }

      for (i = 0; i < dev_priv->num_irqs; ++i) {
            if (status & cur_irq->pending_mask) {
                  atomic_inc(&cur_irq->irq_received);
                  DRM_WAKEUP(&cur_irq->irq_queue);
                  handled = 1;
                  if (dev_priv->irq_map[drm_via_irq_dma0_td] == i) {
                        via_dmablit_handler(dev, 0, 1);
                  } else if (dev_priv->irq_map[drm_via_irq_dma1_td] == i) {
                        via_dmablit_handler(dev, 1, 1);
                  }
            }
            cur_irq++;
      }

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

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

static __inline__ void viadrv_acknowledge_irqs(drm_via_private_t * dev_priv)
{
      u32 status;

      if (dev_priv) {
            /* Acknowlege interrupts */
            status = VIA_READ(VIA_REG_INTERRUPT);
            VIA_WRITE(VIA_REG_INTERRUPT, status |
                    dev_priv->irq_pending_mask);
      }
}

int via_driver_vblank_wait(struct drm_device * dev, unsigned int *sequence)
{
      drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
      unsigned int cur_vblank;
      int ret = 0;

      DRM_DEBUG("viadrv_vblank_wait\n");
      if (!dev_priv) {
            DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
            return -EINVAL;
      }

      viadrv_acknowledge_irqs(dev_priv);

      /* Assume that the user has missed the current sequence number
       * by about a day rather than she wants to wait for years
       * using vertical blanks...
       */

      DRM_WAIT_ON(ret, dev->vbl_queue, 3 * DRM_HZ,
                (((cur_vblank = atomic_read(&dev->vbl_received)) -
                  *sequence) <= (1 << 23)));

      *sequence = cur_vblank;
      return ret;
}

static int
via_driver_irq_wait(struct drm_device * dev, unsigned int irq, int force_sequence,
                unsigned int *sequence)
{
      drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
      unsigned int cur_irq_sequence;
      drm_via_irq_t *cur_irq;
      int ret = 0;
      maskarray_t *masks;
      int real_irq;

      DRM_DEBUG("%s\n", __FUNCTION__);

      if (!dev_priv) {
            DRM_ERROR("%s called with no initialization\n", __FUNCTION__);
            return -EINVAL;
      }

      if (irq >= drm_via_irq_num) {
            DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__,
                    irq);
            return -EINVAL;
      }

      real_irq = dev_priv->irq_map[irq];

      if (real_irq < 0) {
            DRM_ERROR("%s Video IRQ %d not available on this hardware.\n",
                    __FUNCTION__, irq);
            return -EINVAL;
      }

      masks = dev_priv->irq_masks;
      cur_irq = dev_priv->via_irqs + real_irq;

      if (masks[real_irq][2] && !force_sequence) {
            DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
                      ((VIA_READ(masks[irq][2]) & masks[irq][3]) ==
                       masks[irq][4]));
            cur_irq_sequence = atomic_read(&cur_irq->irq_received);
      } else {
            DRM_WAIT_ON(ret, cur_irq->irq_queue, 3 * DRM_HZ,
                      (((cur_irq_sequence =
                         atomic_read(&cur_irq->irq_received)) -
                        *sequence) <= (1 << 23)));
      }
      *sequence = cur_irq_sequence;
      return ret;
}

/*
 * drm_dma.h hooks
 */

void via_driver_irq_preinstall(struct drm_device * dev)
{
      drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
      u32 status;
      drm_via_irq_t *cur_irq;
      int i;

      DRM_DEBUG("driver_irq_preinstall: dev_priv: %p\n", dev_priv);
      if (dev_priv) {
            cur_irq = dev_priv->via_irqs;

            dev_priv->irq_enable_mask = VIA_IRQ_VBLANK_ENABLE;
            dev_priv->irq_pending_mask = VIA_IRQ_VBLANK_PENDING;

            if (dev_priv->chipset == VIA_PRO_GROUP_A ||
                dev_priv->chipset == VIA_DX9_0) {
                  dev_priv->irq_masks = via_pro_group_a_irqs;
                  dev_priv->num_irqs = via_num_pro_group_a;
                  dev_priv->irq_map = via_irqmap_pro_group_a;
            } else {
                  dev_priv->irq_masks = via_unichrome_irqs;
                  dev_priv->num_irqs = via_num_unichrome;
                  dev_priv->irq_map = via_irqmap_unichrome;
            }

            for (i = 0; i < dev_priv->num_irqs; ++i) {
                  atomic_set(&cur_irq->irq_received, 0);
                  cur_irq->enable_mask = dev_priv->irq_masks[i][0];
                  cur_irq->pending_mask = dev_priv->irq_masks[i][1];
                  DRM_INIT_WAITQUEUE(&cur_irq->irq_queue);
                  dev_priv->irq_enable_mask |= cur_irq->enable_mask;
                  dev_priv->irq_pending_mask |= cur_irq->pending_mask;
                  cur_irq++;

                  DRM_DEBUG("Initializing IRQ %d\n", i);
            }

            dev_priv->last_vblank_valid = 0;

            /* Clear VSync interrupt regs */
            status = VIA_READ(VIA_REG_INTERRUPT);
            VIA_WRITE(VIA_REG_INTERRUPT, status &
                    ~(dev_priv->irq_enable_mask));

            /* Clear bits if they're already high */
            viadrv_acknowledge_irqs(dev_priv);
      }
}

void via_driver_irq_postinstall(struct drm_device * dev)
{
      drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
      u32 status;

      DRM_DEBUG("via_driver_irq_postinstall\n");
      if (dev_priv) {
            status = VIA_READ(VIA_REG_INTERRUPT);
            VIA_WRITE(VIA_REG_INTERRUPT, status | VIA_IRQ_GLOBAL
                    | dev_priv->irq_enable_mask);

            /* Some magic, oh for some data sheets ! */

            VIA_WRITE8(0x83d4, 0x11);
            VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) | 0x30);

      }
}

void via_driver_irq_uninstall(struct drm_device * dev)
{
      drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
      u32 status;

      DRM_DEBUG("driver_irq_uninstall)\n");
      if (dev_priv) {

            /* Some more magic, oh for some data sheets ! */

            VIA_WRITE8(0x83d4, 0x11);
            VIA_WRITE8(0x83d5, VIA_READ8(0x83d5) & ~0x30);

            status = VIA_READ(VIA_REG_INTERRUPT);
            VIA_WRITE(VIA_REG_INTERRUPT, status &
                    ~(VIA_IRQ_VBLANK_ENABLE | dev_priv->irq_enable_mask));
      }
}

int via_wait_irq(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
      drm_via_irqwait_t *irqwait = data;
      struct timeval now;
      int ret = 0;
      drm_via_private_t *dev_priv = (drm_via_private_t *) dev->dev_private;
      drm_via_irq_t *cur_irq = dev_priv->via_irqs;
      int force_sequence;

      if (!dev->irq)
            return -EINVAL;

      if (irqwait->request.irq >= dev_priv->num_irqs) {
            DRM_ERROR("%s Trying to wait on unknown irq %d\n", __FUNCTION__,
                    irqwait->request.irq);
            return -EINVAL;
      }

      cur_irq += irqwait->request.irq;

      switch (irqwait->request.type & ~VIA_IRQ_FLAGS_MASK) {
      case VIA_IRQ_RELATIVE:
            irqwait->request.sequence += atomic_read(&cur_irq->irq_received);
            irqwait->request.type &= ~_DRM_VBLANK_RELATIVE;
      case VIA_IRQ_ABSOLUTE:
            break;
      default:
            return -EINVAL;
      }

      if (irqwait->request.type & VIA_IRQ_SIGNAL) {
            DRM_ERROR("%s Signals on Via IRQs not implemented yet.\n",
                    __FUNCTION__);
            return -EINVAL;
      }

      force_sequence = (irqwait->request.type & VIA_IRQ_FORCE_SEQUENCE);

      ret = via_driver_irq_wait(dev, irqwait->request.irq, force_sequence,
                          &irqwait->request.sequence);
      do_gettimeofday(&now);
      irqwait->reply.tval_sec = now.tv_sec;
      irqwait->reply.tval_usec = now.tv_usec;

      return ret;
}

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