Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 754 insertions, 0 deletions

diff --git a/drivers/char/drm/mga_dma.c b/drivers/char/drm/mga_dma.c
new file mode 100644
index 000000000000..832eaf8a5068
--- /dev/null
+++ b/drivers/char/drm/mga_dma.c
@@ -0,0 +1,754 @@
+/* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
+ * Created: Mon Dec 13 01:50:01 1999 by jhartmann@precisioninsight.com
+ *
+ * Copyright 1999 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
+ * PRECISION INSIGHT 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:
+ *    Rickard E. (Rik) Faith <faith@valinux.com>
+ *    Jeff Hartmann <jhartmann@valinux.com>
+ *    Keith Whitwell <keith@tungstengraphics.com>
+ *
+ * Rewritten by:
+ *    Gareth Hughes <gareth@valinux.com>
+ */
+
+#include "drmP.h"
+#include "drm.h"
+#include "mga_drm.h"
+#include "mga_drv.h"
+
+#define MGA_DEFAULT_USEC_TIMEOUT        10000
+#define MGA_FREELIST_DEBUG              0
+
+static int mga_do_cleanup_dma( drm_device_t *dev );
+
+/* ================================================================
+ * Engine control
+ */
+
+int mga_do_wait_for_idle( drm_mga_private_t *dev_priv )
+{
+        u32 status = 0;
+        int i;
+        DRM_DEBUG( "\n" );
+
+        for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
+                status = MGA_READ( MGA_STATUS ) & MGA_ENGINE_IDLE_MASK;
+                if ( status == MGA_ENDPRDMASTS ) {
+                        MGA_WRITE8( MGA_CRTC_INDEX, 0 );
+                        return 0;
+                }
+                DRM_UDELAY( 1 );
+        }
+
+#if MGA_DMA_DEBUG
+        DRM_ERROR( "failed!\n" );
+        DRM_INFO( "   status=0x%08x\n", status );
+#endif
+        return DRM_ERR(EBUSY);
+}
+
+static int mga_do_dma_reset( drm_mga_private_t *dev_priv )
+{
+        drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
+        drm_mga_primary_buffer_t *primary = &dev_priv->prim;
+
+        DRM_DEBUG( "\n" );
+
+        /* The primary DMA stream should look like new right about now.
+         */
+        primary->tail = 0;
+        primary->space = primary->size;
+        primary->last_flush = 0;
+
+        sarea_priv->last_wrap = 0;
+
+        /* FIXME: Reset counters, buffer ages etc...
+         */
+
+        /* FIXME: What else do we need to reinitialize?  WARP stuff?
+         */
+
+        return 0;
+}
+
+/* ================================================================
+ * Primary DMA stream
+ */
+
+void mga_do_dma_flush( drm_mga_private_t *dev_priv )
+{
+        drm_mga_primary_buffer_t *primary = &dev_priv->prim;
+        u32 head, tail;
+        u32 status = 0;
+        int i;
+        DMA_LOCALS;
+        DRM_DEBUG( "\n" );
+
+        /* We need to wait so that we can do an safe flush */
+        for ( i = 0 ; i < dev_priv->usec_timeout ; i++ ) {
+                status = MGA_READ( MGA_STATUS ) & MGA_ENGINE_IDLE_MASK;
+                if ( status == MGA_ENDPRDMASTS ) break;
+                DRM_UDELAY( 1 );
+        }
+
+        if ( primary->tail == primary->last_flush ) {
+                DRM_DEBUG( "   bailing out...\n" );
+                return;
+        }
+
+        tail = primary->tail + dev_priv->primary->offset;
+
+        /* We need to pad the stream between flushes, as the card
+         * actually (partially?) reads the first of these commands.
+         * See page 4-16 in the G400 manual, middle of the page or so.
+         */
+        BEGIN_DMA( 1 );
+
+        DMA_BLOCK( MGA_DMAPAD,  0x00000000,
+                   MGA_DMAPAD,  0x00000000,
+                   MGA_DMAPAD,  0x00000000,
+                   MGA_DMAPAD,  0x00000000 );
+
+        ADVANCE_DMA();
+
+        primary->last_flush = primary->tail;
+
+        head = MGA_READ( MGA_PRIMADDRESS );
+
+        if ( head <= tail ) {
+                primary->space = primary->size - primary->tail;
+        } else {
+                primary->space = head - tail;
+        }
+
+        DRM_DEBUG( "   head = 0x%06lx\n", head - dev_priv->primary->offset );
+        DRM_DEBUG( "   tail = 0x%06lx\n", tail - dev_priv->primary->offset );
+        DRM_DEBUG( "  space = 0x%06x\n", primary->space );
+
+        mga_flush_write_combine();
+        MGA_WRITE( MGA_PRIMEND, tail | MGA_PAGPXFER );
+
+        DRM_DEBUG( "done.\n" );
+}
+
+void mga_do_dma_wrap_start( drm_mga_private_t *dev_priv )
+{
+        drm_mga_primary_buffer_t *primary = &dev_priv->prim;
+        u32 head, tail;
+        DMA_LOCALS;
+        DRM_DEBUG( "\n" );
+
+        BEGIN_DMA_WRAP();
+
+        DMA_BLOCK( MGA_DMAPAD,  0x00000000,
+                   MGA_DMAPAD,  0x00000000,
+                   MGA_DMAPAD,  0x00000000,
+                   MGA_DMAPAD,  0x00000000 );
+
+        ADVANCE_DMA();
+
+        tail = primary->tail + dev_priv->primary->offset;
+
+        primary->tail = 0;
+        primary->last_flush = 0;
+        primary->last_wrap++;
+
+        head = MGA_READ( MGA_PRIMADDRESS );
+
+        if ( head == dev_priv->primary->offset ) {
+                primary->space = primary->size;
+        } else {
+                primary->space = head - dev_priv->primary->offset;
+        }
+
+        DRM_DEBUG( "   head = 0x%06lx\n",
+                  head - dev_priv->primary->offset );
+        DRM_DEBUG( "   tail = 0x%06x\n", primary->tail );
+        DRM_DEBUG( "   wrap = %d\n", primary->last_wrap );
+        DRM_DEBUG( "  space = 0x%06x\n", primary->space );
+
+        mga_flush_write_combine();
+        MGA_WRITE( MGA_PRIMEND, tail | MGA_PAGPXFER );
+
+        set_bit( 0, &primary->wrapped );
+        DRM_DEBUG( "done.\n" );
+}
+
+void mga_do_dma_wrap_end( drm_mga_private_t *dev_priv )
+{
+        drm_mga_primary_buffer_t *primary = &dev_priv->prim;
+        drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
+        u32 head = dev_priv->primary->offset;
+        DRM_DEBUG( "\n" );
+
+        sarea_priv->last_wrap++;
+        DRM_DEBUG( "   wrap = %d\n", sarea_priv->last_wrap );
+
+        mga_flush_write_combine();
+        MGA_WRITE( MGA_PRIMADDRESS, head | MGA_DMA_GENERAL );
+
+        clear_bit( 0, &primary->wrapped );
+        DRM_DEBUG( "done.\n" );
+}
+
+
+/* ================================================================
+ * Freelist management
+ */
+
+#define MGA_BUFFER_USED         ~0
+#define MGA_BUFFER_FREE         0
+
+#if MGA_FREELIST_DEBUG
+static void mga_freelist_print( drm_device_t *dev )
+{
+        drm_mga_private_t *dev_priv = dev->dev_private;
+        drm_mga_freelist_t *entry;
+
+        DRM_INFO( "\n" );
+        DRM_INFO( "current dispatch: last=0x%x done=0x%x\n",
+                  dev_priv->sarea_priv->last_dispatch,
+                  (unsigned int)(MGA_READ( MGA_PRIMADDRESS ) -
+                                 dev_priv->primary->offset) );
+        DRM_INFO( "current freelist:\n" );
+
+        for ( entry = dev_priv->head->next ; entry ; entry = entry->next ) {
+                DRM_INFO( "   %p   idx=%2d  age=0x%x 0x%06lx\n",
+                          entry, entry->buf->idx, entry->age.head,
+                          entry->age.head - dev_priv->primary->offset );
+        }
+        DRM_INFO( "\n" );
+}
+#endif
+
+static int mga_freelist_init( drm_device_t *dev, drm_mga_private_t *dev_priv )
+{
+        drm_device_dma_t *dma = dev->dma;
+        drm_buf_t *buf;
+        drm_mga_buf_priv_t *buf_priv;
+        drm_mga_freelist_t *entry;
+        int i;
+        DRM_DEBUG( "count=%d\n", dma->buf_count );
+
+        dev_priv->head = drm_alloc( sizeof(drm_mga_freelist_t),
+                                     DRM_MEM_DRIVER );
+        if ( dev_priv->head == NULL )
+                return DRM_ERR(ENOMEM);
+
+        memset( dev_priv->head, 0, sizeof(drm_mga_freelist_t) );
+        SET_AGE( &dev_priv->head->age, MGA_BUFFER_USED, 0 );
+
+        for ( i = 0 ; i < dma->buf_count ; i++ ) {
+                buf = dma->buflist[i];
+                buf_priv = buf->dev_private;
+
+                entry = drm_alloc( sizeof(drm_mga_freelist_t),
+                                    DRM_MEM_DRIVER );
+                if ( entry == NULL )
+                        return DRM_ERR(ENOMEM);
+
+                memset( entry, 0, sizeof(drm_mga_freelist_t) );
+
+                entry->next = dev_priv->head->next;
+                entry->prev = dev_priv->head;
+                SET_AGE( &entry->age, MGA_BUFFER_FREE, 0 );
+                entry->buf = buf;
+
+                if ( dev_priv->head->next != NULL )
+                        dev_priv->head->next->prev = entry;
+                if ( entry->next == NULL )
+                        dev_priv->tail = entry;
+
+                buf_priv->list_entry = entry;
+                buf_priv->discard = 0;
+                buf_priv->dispatched = 0;
+
+                dev_priv->head->next = entry;
+        }
+
+        return 0;
+}
+
+static void mga_freelist_cleanup( drm_device_t *dev )
+{
+        drm_mga_private_t *dev_priv = dev->dev_private;
+        drm_mga_freelist_t *entry;
+        drm_mga_freelist_t *next;
+        DRM_DEBUG( "\n" );
+
+        entry = dev_priv->head;
+        while ( entry ) {
+                next = entry->next;
+                drm_free( entry, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER );
+                entry = next;
+        }
+
+        dev_priv->head = dev_priv->tail = NULL;
+}
+
+#if 0
+/* FIXME: Still needed?
+ */
+static void mga_freelist_reset( drm_device_t *dev )
+{
+        drm_device_dma_t *dma = dev->dma;
+        drm_buf_t *buf;
+        drm_mga_buf_priv_t *buf_priv;
+        int i;
+
+        for ( i = 0 ; i < dma->buf_count ; i++ ) {
+                buf = dma->buflist[i];
+                buf_priv = buf->dev_private;
+                SET_AGE( &buf_priv->list_entry->age,
+                         MGA_BUFFER_FREE, 0 );
+        }
+}
+#endif
+
+static drm_buf_t *mga_freelist_get( drm_device_t *dev )
+{
+        drm_mga_private_t *dev_priv = dev->dev_private;
+        drm_mga_freelist_t *next;
+        drm_mga_freelist_t *prev;
+        drm_mga_freelist_t *tail = dev_priv->tail;
+        u32 head, wrap;
+        DRM_DEBUG( "\n" );
+
+        head = MGA_READ( MGA_PRIMADDRESS );
+        wrap = dev_priv->sarea_priv->last_wrap;
+
+        DRM_DEBUG( "   tail=0x%06lx %d\n",
+                   tail->age.head ?
+                   tail->age.head - dev_priv->primary->offset : 0,
+                   tail->age.wrap );
+        DRM_DEBUG( "   head=0x%06lx %d\n",
+                   head - dev_priv->primary->offset, wrap );
+
+        if ( TEST_AGE( &tail->age, head, wrap ) ) {
+                prev = dev_priv->tail->prev;
+                next = dev_priv->tail;
+                prev->next = NULL;
+                next->prev = next->next = NULL;
+                dev_priv->tail = prev;
+                SET_AGE( &next->age, MGA_BUFFER_USED, 0 );
+                return next->buf;
+        }
+
+        DRM_DEBUG( "returning NULL!\n" );
+        return NULL;
+}
+
+int mga_freelist_put( drm_device_t *dev, drm_buf_t *buf )
+{
+        drm_mga_private_t *dev_priv = dev->dev_private;
+        drm_mga_buf_priv_t *buf_priv = buf->dev_private;
+        drm_mga_freelist_t *head, *entry, *prev;
+
+        DRM_DEBUG( "age=0x%06lx wrap=%d\n",
+                   buf_priv->list_entry->age.head -
+                   dev_priv->primary->offset,
+                   buf_priv->list_entry->age.wrap );
+
+        entry = buf_priv->list_entry;
+        head = dev_priv->head;
+
+        if ( buf_priv->list_entry->age.head == MGA_BUFFER_USED ) {
+                SET_AGE( &entry->age, MGA_BUFFER_FREE, 0 );
+                prev = dev_priv->tail;
+                prev->next = entry;
+                entry->prev = prev;
+                entry->next = NULL;
+        } else {
+                prev = head->next;
+                head->next = entry;
+                prev->prev = entry;
+                entry->prev = head;
+                entry->next = prev;
+        }
+
+        return 0;
+}
+
+
+/* ================================================================
+ * DMA initialization, cleanup
+ */
+
+static int mga_do_init_dma( drm_device_t *dev, drm_mga_init_t *init )
+{
+        drm_mga_private_t *dev_priv;
+        int ret;
+        DRM_DEBUG( "\n" );
+
+        dev_priv = drm_alloc( sizeof(drm_mga_private_t), DRM_MEM_DRIVER );
+        if ( !dev_priv )
+                return DRM_ERR(ENOMEM);
+
+        memset( dev_priv, 0, sizeof(drm_mga_private_t) );
+
+        dev_priv->chipset = init->chipset;
+
+        dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT;
+
+        if ( init->sgram ) {
+                dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_BLK;
+        } else {
+                dev_priv->clear_cmd = MGA_DWGCTL_CLEAR | MGA_ATYPE_RSTR;
+        }
+        dev_priv->maccess       = init->maccess;
+
+        dev_priv->fb_cpp        = init->fb_cpp;
+        dev_priv->front_offset  = init->front_offset;
+        dev_priv->front_pitch   = init->front_pitch;
+        dev_priv->back_offset   = init->back_offset;
+        dev_priv->back_pitch    = init->back_pitch;
+
+        dev_priv->depth_cpp     = init->depth_cpp;
+        dev_priv->depth_offset  = init->depth_offset;
+        dev_priv->depth_pitch   = init->depth_pitch;
+
+        /* FIXME: Need to support AGP textures...
+         */
+        dev_priv->texture_offset = init->texture_offset[0];
+        dev_priv->texture_size = init->texture_size[0];
+
+        DRM_GETSAREA();
+
+        if(!dev_priv->sarea) {
+                DRM_ERROR( "failed to find sarea!\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return DRM_ERR(EINVAL);
+        }
+
+        dev_priv->mmio = drm_core_findmap(dev, init->mmio_offset);
+        if(!dev_priv->mmio) {
+                DRM_ERROR( "failed to find mmio region!\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return DRM_ERR(EINVAL);
+        }
+        dev_priv->status = drm_core_findmap(dev, init->status_offset);
+        if(!dev_priv->status) {
+                DRM_ERROR( "failed to find status page!\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return DRM_ERR(EINVAL);
+        }
+        dev_priv->warp = drm_core_findmap(dev, init->warp_offset);
+        if(!dev_priv->warp) {
+                DRM_ERROR( "failed to find warp microcode region!\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return DRM_ERR(EINVAL);
+        }
+        dev_priv->primary = drm_core_findmap(dev, init->primary_offset);
+        if(!dev_priv->primary) {
+                DRM_ERROR( "failed to find primary dma region!\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return DRM_ERR(EINVAL);
+        }
+        dev->agp_buffer_map = drm_core_findmap(dev, init->buffers_offset);
+        if(!dev->agp_buffer_map) {
+                DRM_ERROR( "failed to find dma buffer region!\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return DRM_ERR(EINVAL);
+        }
+
+        dev_priv->sarea_priv =
+                (drm_mga_sarea_t *)((u8 *)dev_priv->sarea->handle +
+                                    init->sarea_priv_offset);
+
+        drm_core_ioremap( dev_priv->warp, dev );
+        drm_core_ioremap( dev_priv->primary, dev );
+        drm_core_ioremap( dev->agp_buffer_map, dev );
+
+        if(!dev_priv->warp->handle ||
+           !dev_priv->primary->handle ||
+           !dev->agp_buffer_map->handle ) {
+                DRM_ERROR( "failed to ioremap agp regions!\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return DRM_ERR(ENOMEM);
+        }
+
+        ret = mga_warp_install_microcode( dev_priv );
+        if ( ret < 0 ) {
+                DRM_ERROR( "failed to install WARP ucode!\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return ret;
+        }
+
+        ret = mga_warp_init( dev_priv );
+        if ( ret < 0 ) {
+                DRM_ERROR( "failed to init WARP engine!\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return ret;
+        }
+
+        dev_priv->prim.status = (u32 *)dev_priv->status->handle;
+
+        mga_do_wait_for_idle( dev_priv );
+
+        /* Init the primary DMA registers.
+         */
+        MGA_WRITE( MGA_PRIMADDRESS,
+                   dev_priv->primary->offset | MGA_DMA_GENERAL );
+#if 0
+        MGA_WRITE( MGA_PRIMPTR,
+                   virt_to_bus((void *)dev_priv->prim.status) |
+                   MGA_PRIMPTREN0 |     /* Soft trap, SECEND, SETUPEND */
+                   MGA_PRIMPTREN1 );    /* DWGSYNC */
+#endif
+
+        dev_priv->prim.start = (u8 *)dev_priv->primary->handle;
+        dev_priv->prim.end = ((u8 *)dev_priv->primary->handle
+                              + dev_priv->primary->size);
+        dev_priv->prim.size = dev_priv->primary->size;
+
+        dev_priv->prim.tail = 0;
+        dev_priv->prim.space = dev_priv->prim.size;
+        dev_priv->prim.wrapped = 0;
+
+        dev_priv->prim.last_flush = 0;
+        dev_priv->prim.last_wrap = 0;
+
+        dev_priv->prim.high_mark = 256 * DMA_BLOCK_SIZE;
+
+        dev_priv->prim.status[0] = dev_priv->primary->offset;
+        dev_priv->prim.status[1] = 0;
+
+        dev_priv->sarea_priv->last_wrap = 0;
+        dev_priv->sarea_priv->last_frame.head = 0;
+        dev_priv->sarea_priv->last_frame.wrap = 0;
+
+        if ( mga_freelist_init( dev, dev_priv ) < 0 ) {
+                DRM_ERROR( "could not initialize freelist\n" );
+                /* Assign dev_private so we can do cleanup. */
+                dev->dev_private = (void *)dev_priv;
+                mga_do_cleanup_dma( dev );
+                return DRM_ERR(ENOMEM);
+        }
+
+        /* Make dev_private visable to others. */
+        dev->dev_private = (void *)dev_priv;
+        return 0;
+}
+
+static int mga_do_cleanup_dma( drm_device_t *dev )
+{
+        DRM_DEBUG( "\n" );
+
+        /* Make sure interrupts are disabled here because the uninstall ioctl
+         * may not have been called from userspace and after dev_private
+         * is freed, it's too late.
+         */
+        if ( dev->irq_enabled ) drm_irq_uninstall(dev);
+
+        if ( dev->dev_private ) {
+                drm_mga_private_t *dev_priv = dev->dev_private;
+
+                if ( dev_priv->warp != NULL )
+                        drm_core_ioremapfree( dev_priv->warp, dev );
+                if ( dev_priv->primary != NULL )
+                        drm_core_ioremapfree( dev_priv->primary, dev );
+                if ( dev->agp_buffer_map != NULL )
+                        drm_core_ioremapfree( dev->agp_buffer_map, dev );
+
+                if ( dev_priv->head != NULL ) {
+                        mga_freelist_cleanup( dev );
+                }
+
+                drm_free( dev->dev_private, sizeof(drm_mga_private_t),
+                           DRM_MEM_DRIVER );
+                dev->dev_private = NULL;
+        }
+
+        return 0;
+}
+
+int mga_dma_init( DRM_IOCTL_ARGS )
+{
+        DRM_DEVICE;
+        drm_mga_init_t init;
+
+        LOCK_TEST_WITH_RETURN( dev, filp );
+
+        DRM_COPY_FROM_USER_IOCTL( init, (drm_mga_init_t __user *)data, sizeof(init) );
+
+        switch ( init.func ) {
+        case MGA_INIT_DMA:
+                return mga_do_init_dma( dev, &init );
+        case MGA_CLEANUP_DMA:
+                return mga_do_cleanup_dma( dev );
+        }
+
+        return DRM_ERR(EINVAL);
+}
+
+
+/* ================================================================
+ * Primary DMA stream management
+ */
+
+int mga_dma_flush( DRM_IOCTL_ARGS )
+{
+        DRM_DEVICE;
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+        drm_lock_t lock;
+
+        LOCK_TEST_WITH_RETURN( dev, filp );
+
+        DRM_COPY_FROM_USER_IOCTL( lock, (drm_lock_t __user *)data, sizeof(lock) );
+
+        DRM_DEBUG( "%s%s%s\n",
+                   (lock.flags & _DRM_LOCK_FLUSH) ?     "flush, " : "",
+                   (lock.flags & _DRM_LOCK_FLUSH_ALL) ? "flush all, " : "",
+                   (lock.flags & _DRM_LOCK_QUIESCENT) ? "idle, " : "" );
+
+        WRAP_WAIT_WITH_RETURN( dev_priv );
+
+        if ( lock.flags & (_DRM_LOCK_FLUSH | _DRM_LOCK_FLUSH_ALL) ) {
+                mga_do_dma_flush( dev_priv );
+        }
+
+        if ( lock.flags & _DRM_LOCK_QUIESCENT ) {
+#if MGA_DMA_DEBUG
+                int ret = mga_do_wait_for_idle( dev_priv );
+                if ( ret < 0 )
+                        DRM_INFO( "%s: -EBUSY\n", __FUNCTION__ );
+                return ret;
+#else
+                return mga_do_wait_for_idle( dev_priv );
+#endif
+        } else {
+                return 0;
+        }
+}
+
+int mga_dma_reset( DRM_IOCTL_ARGS )
+{
+        DRM_DEVICE;
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+
+        LOCK_TEST_WITH_RETURN( dev, filp );
+
+        return mga_do_dma_reset( dev_priv );
+}
+
+
+/* ================================================================
+ * DMA buffer management
+ */
+
+static int mga_dma_get_buffers( DRMFILE filp,
+                                drm_device_t *dev, drm_dma_t *d )
+{
+        drm_buf_t *buf;
+        int i;
+
+        for ( i = d->granted_count ; i < d->request_count ; i++ ) {
+                buf = mga_freelist_get( dev );
+                if ( !buf ) return DRM_ERR(EAGAIN);
+
+                buf->filp = filp;
+
+                if ( DRM_COPY_TO_USER( &d->request_indices[i],
+                                   &buf->idx, sizeof(buf->idx) ) )
+                        return DRM_ERR(EFAULT);
+                if ( DRM_COPY_TO_USER( &d->request_sizes[i],
+                                   &buf->total, sizeof(buf->total) ) )
+                        return DRM_ERR(EFAULT);
+
+                d->granted_count++;
+        }
+        return 0;
+}
+
+int mga_dma_buffers( DRM_IOCTL_ARGS )
+{
+        DRM_DEVICE;
+        drm_device_dma_t *dma = dev->dma;
+        drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+        drm_dma_t __user *argp = (void __user *)data;
+        drm_dma_t d;
+        int ret = 0;
+
+        LOCK_TEST_WITH_RETURN( dev, filp );
+
+        DRM_COPY_FROM_USER_IOCTL( d, argp, sizeof(d) );
+
+        /* Please don't send us buffers.
+         */
+        if ( d.send_count != 0 ) {
+                DRM_ERROR( "Process %d trying to send %d buffers via drmDMA\n",
+                           DRM_CURRENTPID, d.send_count );
+                return DRM_ERR(EINVAL);
+        }
+
+        /* We'll send you buffers.
+         */
+        if ( d.request_count < 0 || d.request_count > dma->buf_count ) {
+                DRM_ERROR( "Process %d trying to get %d buffers (of %d max)\n",
+                           DRM_CURRENTPID, d.request_count, dma->buf_count );
+                return DRM_ERR(EINVAL);
+        }
+
+        WRAP_TEST_WITH_RETURN( dev_priv );
+
+        d.granted_count = 0;
+
+        if ( d.request_count ) {
+                ret = mga_dma_get_buffers( filp, dev, &d );
+        }
+
+        DRM_COPY_TO_USER_IOCTL( argp, d, sizeof(d) );
+
+        return ret;
+}
+
+void mga_driver_pretakedown(drm_device_t *dev)
+{
+        mga_do_cleanup_dma( dev );
+}
+
+int mga_driver_dma_quiescent(drm_device_t *dev)
+{
+        drm_mga_private_t *dev_priv = dev->dev_private;
+        return mga_do_wait_for_idle( dev_priv );
+}