1 files changed, 52 insertions, 0 deletions
diff --git a/i386/i386at/gpl/linux/linux_dma.c b/i386/i386at/gpl/linux/linux_dma.c
new file mode 100644
index 00000000..aab0fa8e
--- /dev/null
+++ b/i386/i386at/gpl/linux/linux_dma.c
@@ -0,0 +1,52 @@
+/*
+ * Linux DMA channel management.
+ * Copyright (C) 1995 Shantanu Goel.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#define MACH_INCLUDE
+#include <linux/errno.h>
+#include <asm/dma.h>
+
+/*
+ * Bitmap of allocated/free DMA channels.
+ */
+static int dma_busy = 0x10;
+
+/*
+ * Allocate a DMA channel.
+ */
+int
+request_dma(unsigned int drq, const char *name)
+{
+	if (drq > 7)
+		panic("request_dma: bad DRQ number");
+	if (dma_busy & (1 << drq))
+		return (-LINUX_EBUSY);
+	dma_busy |= 1 << drq;
+	return (0);
+}
+
+/*
+ * Free a DMA channel.
+ */
+void
+free_dma(unsigned int drq)
+{
+	if (drq > 7)
+		panic("free_dma: bad DRQ number");
+	dma_busy &= ~(1 << drq);
+}