1 files changed, 213 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/gpio.c b/arch/arm/mach-s3c2410/gpio.c
new file mode 100644
index 000000000000..94f1776cf312
--- /dev/null
+++ b/arch/arm/mach-s3c2410/gpio.c
@@ -0,0 +1,213 @@
+/* linux/arch/arm/mach-s3c2410/gpio.c
+ *
+ * Copyright (c) 2004-2005 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2410 GPIO support
+ *
+ * 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 of the License, 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, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Changelog
+ *      13-Sep-2004  BJD  Implemented change of MISCCR
+ *      14-Sep-2004  BJD  Added getpin call
+ *      14-Sep-2004  BJD  Fixed bug in setpin() call
+ *      30-Sep-2004  BJD  Fixed cfgpin() mask bug
+ *      01-Oct-2004  BJD  Added getcfg() to get pin configuration
+ *      01-Oct-2004  BJD  Fixed mask bug in pullup() call
+ *      01-Oct-2004  BJD  Added getirq() to turn pin into irqno
+ *      04-Oct-2004  BJD  Added irq filter controls for GPIO
+ *      05-Nov-2004  BJD  EXPORT_SYMBOL() added for all code
+ *      13-Mar-2005  BJD  Updates for __iomem
+ */
+
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include <asm/arch/regs-gpio.h>
+
+void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function)
+{
+        void __iomem *base = S3C2410_GPIO_BASE(pin);
+        unsigned long mask;
+        unsigned long con;
+        unsigned long flags;
+
+        if (pin < S3C2410_GPIO_BANKB) {
+                mask = 1 << S3C2410_GPIO_OFFSET(pin);
+        } else {
+                mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
+        }
+
+        local_irq_save(flags);
+
+        con  = __raw_readl(base + 0x00);
+        con &= ~mask;
+        con |= function;
+
+        __raw_writel(con, base + 0x00);
+
+        local_irq_restore(flags);
+}
+
+EXPORT_SYMBOL(s3c2410_gpio_cfgpin);
+
+unsigned int s3c2410_gpio_getcfg(unsigned int pin)
+{
+        void __iomem *base = S3C2410_GPIO_BASE(pin);
+        unsigned long mask;
+
+        if (pin < S3C2410_GPIO_BANKB) {
+                mask = 1 << S3C2410_GPIO_OFFSET(pin);
+        } else {
+                mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
+        }
+
+        return __raw_readl(base) & mask;
+}
+
+EXPORT_SYMBOL(s3c2410_gpio_getcfg);
+
+void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
+{
+        void __iomem *base = S3C2410_GPIO_BASE(pin);
+        unsigned long offs = S3C2410_GPIO_OFFSET(pin);
+        unsigned long flags;
+        unsigned long up;
+
+        if (pin < S3C2410_GPIO_BANKB)
+                return;
+
+        local_irq_save(flags);
+
+        up = __raw_readl(base + 0x08);
+        up &= ~(1L << offs);
+        up |= to << offs;
+        __raw_writel(up, base + 0x08);
+
+        local_irq_restore(flags);
+}
+
+EXPORT_SYMBOL(s3c2410_gpio_pullup);
+
+void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
+{
+        void __iomem *base = S3C2410_GPIO_BASE(pin);
+        unsigned long offs = S3C2410_GPIO_OFFSET(pin);
+        unsigned long flags;
+        unsigned long dat;
+
+        local_irq_save(flags);
+
+        dat = __raw_readl(base + 0x04);
+        dat &= ~(1 << offs);
+        dat |= to << offs;
+        __raw_writel(dat, base + 0x04);
+
+        local_irq_restore(flags);
+}
+
+EXPORT_SYMBOL(s3c2410_gpio_setpin);
+
+unsigned int s3c2410_gpio_getpin(unsigned int pin)
+{
+        void __iomem *base = S3C2410_GPIO_BASE(pin);
+        unsigned long offs = S3C2410_GPIO_OFFSET(pin);
+
+        return __raw_readl(base + 0x04) & (1<< offs);
+}
+
+EXPORT_SYMBOL(s3c2410_gpio_getpin);
+
+unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
+{
+        unsigned long flags;
+        unsigned long misccr;
+
+        local_irq_save(flags);
+        misccr = __raw_readl(S3C2410_MISCCR);
+        misccr &= ~clear;
+        misccr ^= change;
+        __raw_writel(misccr, S3C2410_MISCCR);
+        local_irq_restore(flags);
+
+        return misccr;
+}
+
+EXPORT_SYMBOL(s3c2410_modify_misccr);
+
+int s3c2410_gpio_getirq(unsigned int pin)
+{
+        if (pin < S3C2410_GPF0 || pin > S3C2410_GPG15_EINT23)
+                return -1;      /* not valid interrupts */
+
+        if (pin < S3C2410_GPG0 && pin > S3C2410_GPF7)
+                return -1;      /* not valid pin */
+
+        if (pin < S3C2410_GPF4)
+                return (pin - S3C2410_GPF0) + IRQ_EINT0;
+
+        if (pin < S3C2410_GPG0)
+                return (pin - S3C2410_GPF4) + IRQ_EINT4;
+
+        return (pin - S3C2410_GPG0) + IRQ_EINT8;
+}
+
+EXPORT_SYMBOL(s3c2410_gpio_getirq);
+
+int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
+                           unsigned int config)
+{
+        void __iomem *reg = S3C2410_EINFLT0;
+        unsigned long flags;
+        unsigned long val;
+
+        if (pin < S3C2410_GPG8 || pin > S3C2410_GPG15)
+                return -1;
+
+        config &= 0xff;
+
+        pin -= S3C2410_GPG8_EINT16;
+        reg += pin & ~3;
+
+        local_irq_save(flags);
+
+        /* update filter width and clock source */
+
+        val = __raw_readl(reg);
+        val &= ~(0xff << ((pin & 3) * 8));
+        val |= config << ((pin & 3) * 8);
+        __raw_writel(val, reg);
+
+        /* update filter enable */
+
+        val = __raw_readl(S3C2410_EXTINT2);
+        val &= ~(1 << ((pin * 4) + 3));
+        val |= on << ((pin * 4) + 3);
+        __raw_writel(val, S3C2410_EXTINT2);
+
+        local_irq_restore(flags);
+
+        return 0;
+}
+
+EXPORT_SYMBOL(s3c2410_gpio_irqfilter);