[s3c24xx] bump to 2.6.30-rc6

[openwrt/svn-archive/archive.git] / target / linux / s3c24xx / files-2.6.30 / arch / arm / mach-s3c2442 / gta02-shadow.c

diff --git a/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-shadow.c b/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-shadow.c
new file mode 100644 (file)
index 0000000..c65304a
--- /dev/null
+++ b/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/gta02-shadow.c
@@ -0,0 +1,86 @@
+/*
+ * Common utility code for GTA02
+ *
+ * Copyright (C) 2008 by Openmoko, Inc.
+ * Author: Holger Hans Peter Freyther <freyther@openmoko.org>
+ * All rights reserved.
+ *
+ * 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
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+
+#include <asm/gpio.h>
+#include <mach/regs-gpio.h>
+#include <linux/gta02-shadow.h>
+
+/**
+ * Shadow GPIO bank B handling. For the LEDs we need to keep track of the state
+ * in software. The s3c2410_gpio_setpin must not be used for GPIOs on bank B
+ */
+static unsigned long gpb_mask;
+static unsigned long gpb_state;
+
+void gta02_gpb_add_shadow_gpio(unsigned int gpio)
+{
+       unsigned long offset = S3C2410_GPIO_OFFSET(gpio);
+       unsigned long flags;
+
+       local_irq_save(flags);
+       gpb_mask |= 1L << offset;
+       local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gta02_gpb_add_shadow_gpio);
+
+static void set_shadow_gpio(unsigned long offset, unsigned int value)
+{
+       unsigned long state = value != 0;
+
+       gpb_state &= ~(1L << offset);
+       gpb_state |= state << offset;
+}
+
+void gta02_gpb_setpin(unsigned int pin, unsigned to)
+{
+       void __iomem *base = S3C24XX_GPIO_BASE(S3C2410_GPB0);
+       unsigned long offset = S3C2410_GPIO_OFFSET(pin);
+       unsigned long flags;
+       unsigned long dat;
+
+       BUG_ON(base != S3C24XX_GPIO_BASE(pin));
+
+       local_irq_save(flags);
+       dat = __raw_readl(base + 0x04);
+
+       /* Add the shadow values */
+       dat &= ~gpb_mask;
+       dat |= gpb_state;
+
+       /* Do the operation like s3c2410_gpio_setpin */
+       dat &= ~(1L << offset);
+       dat |= to << offset;
+
+       /* Update the shadow state */
+       if ((1L << offset) & gpb_mask)
+               set_shadow_gpio(offset, to);
+
+       __raw_writel(dat, base + 0x04);
+       local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gta02_gpb_setpin);