[ARM PATCH] 2061/1: S3C2410 - Drive strength control for s3c2440

Patch from Ben Dooks

Register definitions, and support for modifying the
Drive Strength Control registers on the S3C2440

Signed-off-by: Ben Dooks 

arch/arm/mach-s3c2410/s3c2440-dsc.c

+/* linux/arch/arm/mach-s3c2410/s3c2440-dsc.c
+ *
+ * Copyright (c) 2004 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
+*/
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+#include <linux/init.h>
+#include <linux/device.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 "s3c2440.h"
+#include "cpu.h"
+
+int s3c2440_set_dsc(unsigned int pin, unsigned int value)
+{
+	unsigned long 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;
+}

include/asm-arm/arch-s3c2410/regs-dsc.h

+/* linux/include/asm/hardware/s3c2410/regs-dsc.h
+ *
+ * Copyright (c) 2004 Simtec Electronics <linux@simtec.co.uk>
+ *		      http://www.simtec.co.uk/products/SWLINUX/
+ *
+ * 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.
+ *
+ * S3C2440 Signal Drive Strength Control
+ *
+ *  Changelog:
+ *    11-Aug-2004     BJD     Created file
+ *    25-Aug-2004     BJD     Added the _SELECT_* defs for using with functions
+*/
+
+
+#ifndef __ASM_ARCH_REGS_DSC_H
+#define __ASM_ARCH_REGS_DSC_H "2440-dsc"
+
+#ifdef CONFIG_CPU_S3C2440
+
+#define S3C2440_DSC0	   S3C2410_GPIOREG(0xc0)
+#define S3C2440_DSC1	   S3C2410_GPIOREG(0xc4)
+
+#define S3C2440_SELECT_DSC0 (0)
+#define S3C2440_SELECT_DSC1 (1<<31)
+
+#define S3C2440_DSC_GETSHIFT(x) ((x) & 31)
+
+#define S3C2440_DSC0_ENABLE     (1<<31)
+
+#define S3C2440_DSC0_ADDR       (S3C2440_SELECT_DSC0 | 8)
+#define S3C2440_DSC0_ADDR_12mA  (0<<8)
+#define S3C2440_DSC0_ADDR_10mA  (1<<8)
+#define S3C2440_DSC0_ADDR_8mA   (2<<8)
+#define S3C2440_DSC0_ADDR_6mA   (3<<8)
+#define S3C2440_DSC0_ADDR_MASK  (3<<8)
+
+/* D24..D31 */
+#define S3C2440_DSC0_DATA3      (S3C2440_SELECT_DSC0 | 6)
+#define S3C2440_DSC0_DATA3_12mA (0<<6)
+#define S3C2440_DSC0_DATA3_10mA (1<<6)
+#define S3C2440_DSC0_DATA3_8mA  (2<<6)
+#define S3C2440_DSC0_DATA3_6mA  (3<<6)
+#define S3C2440_DSC0_DATA3_MASK (3<<6)
+
+/* D16..D23 */
+#define S3C2440_DSC0_DATA2      (S3C2440_SELECT_DSC0 | 4)
+#define S3C2440_DSC0_DATA2_12mA (0<<4)
+#define S3C2440_DSC0_DATA2_10mA (1<<4)
+#define S3C2440_DSC0_DATA2_8mA  (2<<4)
+#define S3C2440_DSC0_DATA2_6mA  (3<<4)
+#define S3C2440_DSC0_DATA2_MASK (3<<4)
+
+/* D8..D15 */
+#define S3C2440_DSC0_DATA1      (S3C2440_SELECT_DSC0 | 2)
+#define S3C2440_DSC0_DATA1_12mA (0<<2)
+#define S3C2440_DSC0_DATA1_10mA (1<<2)
+#define S3C2440_DSC0_DATA1_8mA  (2<<2)
+#define S3C2440_DSC0_DATA1_6mA  (3<<2)
+#define S3C2440_DSC0_DATA1_MASK (3<<2)
+
+/* D0..D7 */
+#define S3C2440_DSC0_DATA0      (S3C2440_SELECT_DSC0 | 0)
+#define S3C2440_DSC0_DATA0_12mA (0<<0)
+#define S3C2440_DSC0_DATA0_10mA (1<<0)
+#define S3C2440_DSC0_DATA0_8mA  (2<<0)
+#define S3C2440_DSC0_DATA0_6mA  (3<<0)
+#define S3C2440_DSC0_DATA0_MASK (3<<0)
+
+#define S3C2440_DSC1_SCK0       (S3C2440_SELECT_DSC1 | 28)
+#define S3C2440_DSC1_SCK0_12mA  (0<<28)
+#define S3C2440_DSC1_SCK0_10mA  (1<<28)
+#define S3C2440_DSC1_SCK0_8mA   (2<<28)
+#define S3C2440_DSC1_SCK0_6mA   (3<<28)
+#define S3C2440_DSC1_SCK0_MASK  (3<<28)
+
+#define S3C2440_DSC1_SCK1       (S3C2440_SELECT_DSC1 | 26)
+#define S3C2440_DSC1_SCK1_12mA  (0<<26)
+#define S3C2440_DSC1_SCK1_10mA  (1<<26)
+#define S3C2440_DSC1_SCK1_8mA   (2<<26)
+#define S3C2440_DSC1_SCK1_6mA   (3<<26)
+#define S3C2440_DSC1_SCK1_MASK  (3<<26)
+
+#define S3C2440_DSC1_SCKE       (S3C2440_SELECT_DSC1 | 24)
+#define S3C2440_DSC1_SCKE_10mA  (0<<24)
+#define S3C2440_DSC1_SCKE_8mA   (1<<24)
+#define S3C2440_DSC1_SCKE_6mA   (2<<24)
+#define S3C2440_DSC1_SCKE_4mA   (3<<24)
+#define S3C2440_DSC1_SCKE_MASK  (3<<24)
+
+/* SDRAM nRAS/nCAS */
+#define S3C2440_DSC1_SDR        (S3C2440_SELECT_DSC1 | 22)
+#define S3C2440_DSC1_SDR_10mA   (0<<22)
+#define S3C2440_DSC1_SDR_8mA    (1<<22)
+#define S3C2440_DSC1_SDR_6mA    (2<<22)
+#define S3C2440_DSC1_SDR_4mA    (3<<22)
+#define S3C2440_DSC1_SDR_MASK   (3<<22)
+
+/* NAND Flash Controller */
+#define S3C2440_DSC1_NFC        (S3C2440_SELECT_DSC1 | 20)
+#define S3C2440_DSC1_NFC_10mA   (0<<20)
+#define S3C2440_DSC1_NFC_8mA    (1<<20)
+#define S3C2440_DSC1_NFC_6mA    (2<<20)
+#define S3C2440_DSC1_NFC_4mA    (3<<20)
+#define S3C2440_DSC1_NFC_MASK   (3<<20)
+
+/* nBE[0..3] */
+#define S3C2440_DSC1_nBE        (S3C2440_SELECT_DSC1 | 18)
+#define S3C2440_DSC1_nBE_10mA   (0<<18)
+#define S3C2440_DSC1_nBE_8mA    (1<<18)
+#define S3C2440_DSC1_nBE_6mA    (2<<18)
+#define S3C2440_DSC1_nBE_4mA    (3<<18)
+#define S3C2440_DSC1_nBE_MASK   (3<<18)
+
+#define S3C2440_DSC1_WOE        (S3C2440_SELECT_DSC1 | 16)
+#define S3C2440_DSC1_WOE_10mA   (0<<16)
+#define S3C2440_DSC1_WOE_8mA    (1<<16)
+#define S3C2440_DSC1_WOE_6mA    (2<<16)
+#define S3C2440_DSC1_WOE_4mA    (3<<16)
+#define S3C2440_DSC1_WOE_MASK   (3<<16)
+
+#define S3C2440_DSC1_CS7        (S3C2440_SELECT_DSC1 | 14)
+#define S3C2440_DSC1_CS7_10mA   (0<<14)
+#define S3C2440_DSC1_CS7_8mA    (1<<14)
+#define S3C2440_DSC1_CS7_6mA    (2<<14)
+#define S3C2440_DSC1_CS7_4mA    (3<<14)
+#define S3C2440_DSC1_CS7_MASK   (3<<14)
+
+#define S3C2440_DSC1_CS6        (S3C2440_SELECT_DSC1 | 12)
+#define S3C2440_DSC1_CS6_10mA   (0<<12)
+#define S3C2440_DSC1_CS6_8mA    (1<<12)
+#define S3C2440_DSC1_CS6_6mA    (2<<12)
+#define S3C2440_DSC1_CS6_4mA    (3<<12)
+#define S3C2440_DSC1_CS6_MASK   (3<<12)
+
+#define S3C2440_DSC1_CS5        (S3C2440_SELECT_DSC1 | 10)
+#define S3C2440_DSC1_CS5_10mA   (0<<10)
+#define S3C2440_DSC1_CS5_8mA    (1<<10)
+#define S3C2440_DSC1_CS5_6mA    (2<<10)
+#define S3C2440_DSC1_CS5_4mA    (3<<10)
+#define S3C2440_DSC1_CS5_MASK   (3<<10)
+
+#define S3C2440_DSC1_CS4        (S3C2440_SELECT_DSC1 | 8)
+#define S3C2440_DSC1_CS4_10mA   (0<<8)
+#define S3C2440_DSC1_CS4_8mA    (1<<8)
+#define S3C2440_DSC1_CS4_6mA    (2<<8)
+#define S3C2440_DSC1_CS4_4mA    (3<<8)
+#define S3C2440_DSC1_CS4_MASK   (3<<8)
+
+#define S3C2440_DSC1_CS3        (S3C2440_SELECT_DSC1 | 6)
+#define S3C2440_DSC1_CS3_10mA   (0<<6)
+#define S3C2440_DSC1_CS3_8mA    (1<<6)
+#define S3C2440_DSC1_CS3_6mA    (2<<6)
+#define S3C2440_DSC1_CS3_4mA    (3<<6)
+#define S3C2440_DSC1_CS3_MASK   (3<<6)
+
+#define S3C2440_DSC1_CS2        (S3C2440_SELECT_DSC1 | 4)
+#define S3C2440_DSC1_CS2_10mA   (0<<4)
+#define S3C2440_DSC1_CS2_8mA    (1<<4)
+#define S3C2440_DSC1_CS2_6mA    (2<<4)
+#define S3C2440_DSC1_CS2_4mA    (3<<4)
+#define S3C2440_DSC1_CS2_MASK   (3<<4)
+
+#define S3C2440_DSC1_CS1        (S3C2440_SELECT_DSC1 | 2)
+#define S3C2440_DSC1_CS1_10mA   (0<<2)
+#define S3C2440_DSC1_CS1_8mA    (1<<2)
+#define S3C2440_DSC1_CS1_6mA    (2<<2)
+#define S3C2440_DSC1_CS1_4mA    (3<<2)
+#define S3C2440_DSC1_CS1_MASK   (3<<2)
+
+#define S3C2440_DSC1_CS0        (S3C2440_SELECT_DSC1 | 0
+#define S3C2440_DSC1_CS0_10mA   (0<<0)
+#define S3C2440_DSC1_CS0_8mA    (1<<0)
+#define S3C2440_DSC1_CS0_6mA    (2<<0)
+#define S3C2440_DSC1_CS0_4mA    (3<<0)
+#define S3C2440_DSC1_CS0_MASK   (3<<0)
+
+#endif /* CONFIG_CPU_S3C2440 */
+
+#endif	/* __ASM_ARCH_REGS_DSC_H */
+