1 files changed, 59 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/s3c2440-dsc.c b/arch/arm/mach-s3c2410/s3c2440-dsc.c
new file mode 100644
index 000000000000..16fa2a3b38fa
--- /dev/null
+++ b/arch/arm/mach-s3c2410/s3c2440-dsc.c
@@ -0,0 +1,59 @@
+/* linux/arch/arm/mach-s3c2410/s3c2440-dsc.c
+ *
+ * Copyright (c) 2004-2005 Simtec Electronics
+ *   Ben Dooks <ben@simtec.co.uk>
+ *
+ * Samsung S3C2440 Drive Strength Control support
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Modifications:
+ *     29-Aug-2004 BJD  Start of drive-strength control
+ *     09-Nov-2004 BJD  Added symbol export
+ *     11-Jan-2005 BJD  Include fix
+*/
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach/irq.h>
+
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/regs-dsc.h>
+
+#include "cpu.h"
+#include "s3c2440.h"
+
+int s3c2440_set_dsc(unsigned int pin, unsigned int value)
+{
+        void __iomem *base;
+        unsigned long val;
+        unsigned long flags;
+        unsigned long mask;
+
+        base = (pin & S3C2440_SELECT_DSC1) ? S3C2440_DSC1 : S3C2440_DSC0;
+        mask = 3 << S3C2440_DSC_GETSHIFT(pin);
+
+        local_irq_save(flags);
+
+        val = __raw_readl(base);
+        val &= ~mask;
+        val |= value & mask;
+        __raw_writel(val, base);
+
+        local_irq_restore(flags);
+        return 0;
+}
+
+EXPORT_SYMBOL(s3c2440_set_dsc);