Merged ati-pcigart-1-0-0

1 files changed, 138 insertions, 0 deletions

diff --git a/linux-core/ati_pcigart.c b/linux-core/ati_pcigart.c
new file mode 100644
index 00000000..93c5148f
--- /dev/null
+++ b/linux-core/ati_pcigart.c
@@ -0,0 +1,138 @@
+/* ati_pcigart.h -- ATI PCI GART support -*- linux-c -*-
+ * Created: Wed Dec 13 21:52:19 2000 by gareth@valinux.com
+ *
+ * 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:
+ *   Gareth Hughes <gareth@valinux.com>
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+
+#if PAGE_SIZE == 8192
+# define ATI_PCIGART_TABLE_ORDER 	2
+# define ATI_PCIGART_TABLE_PAGES 	(1 << 2)
+#elif PAGE_SIZE == 4096
+# define ATI_PCIGART_TABLE_ORDER 	3
+# define ATI_PCIGART_TABLE_PAGES 	(1 << 3)
+#elif
+# error - PAGE_SIZE not 8K or 4K
+#endif
+
+# define ATI_MAX_PCIGART_PAGES		8192	/* 32 MB aperture, 4K pages */
+# define ATI_PCIGART_PAGE_SIZE		4096	/* PCI GART page size */
+
+static unsigned long DRM(ati_alloc_pcigart_table)( void )
+{
+	unsigned long address;
+	struct page *page;
+	int i;
+	DRM_DEBUG( "%s\n", __FUNCTION__ );
+
+	address = __get_free_pages( GFP_KERNEL, ATI_PCIGART_TABLE_ORDER );
+	if ( address == 0UL ) {
+		return 0;
+	}
+
+	page = virt_to_page( address );
+
+	for ( i = 0 ; i <= ATI_PCIGART_TABLE_PAGES ; i++, page++ ) {
+		atomic_inc( &page->count );
+		SetPageReserved( page );
+	}
+
+	DRM_DEBUG( "%s: returning 0x%08lx\n", __FUNCTION__, address );
+	return address;
+}
+
+static void DRM(ati_free_pcigart_table)( unsigned long address )
+{
+	struct page *page;
+	int i;
+	DRM_DEBUG( "%s\n", __FUNCTION__ );
+
+	if ( !address ) return;
+
+	page = virt_to_page( address );
+
+	for ( i = 0 ; i <= ATI_PCIGART_TABLE_PAGES ; i++, page++ ) {
+		atomic_dec( &page->count );
+		ClearPageReserved( page );
+	}
+
+	free_pages( address, ATI_PCIGART_TABLE_ORDER );
+}
+
+unsigned long DRM(ati_pcigart_init)( drm_device_t *dev )
+{
+	drm_sg_mem_t *entry = dev->sg;
+	unsigned long address;
+	unsigned long pages;
+	u32 *pci_gart, page_base;
+	int i, j;
+
+	if ( !entry ) {
+		DRM_ERROR( "no scatter/gather memory!\n" );
+		return 0;
+	}
+
+	address = DRM(ati_alloc_pcigart_table)();
+	if ( !address ) {
+		DRM_ERROR( "cannot allocate PCI GART page!\n" );
+		return 0;
+	}
+
+	pci_gart = (u32 *)address;
+
+	pages = ( entry->pages <= ATI_MAX_PCIGART_PAGES )
+		? entry->pages : ATI_MAX_PCIGART_PAGES;
+
+	memset( pci_gart, 0, ATI_MAX_PCIGART_PAGES * sizeof(u32) );
+
+	for ( i = 0 ; i < pages ; i++ ) {
+		page_base = virt_to_bus( entry->pagelist[i]->virtual );
+		for (j = 0; j < (PAGE_SIZE / ATI_PCIGART_PAGE_SIZE); j++) {
+			*pci_gart++ = cpu_to_le32( page_base );
+			page_base += ATI_PCIGART_PAGE_SIZE;
+		}
+	}
+
+#if __i386__
+	asm volatile ( "wbinvd" ::: "memory" );
+#else
+	mb();
+#endif
+
+	return address;
+}
+
+int DRM(ati_pcigart_cleanup)( unsigned long address )
+{
+
+	if ( address ) {
+		DRM(ati_free_pcigart_table)( address );
+	}
+
+	return 0;
+}