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87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
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* Common utility code for GTA02
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*
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* Copyright (C) 2008 by Openmoko, Inc.
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* Author: Holger Hans Peter Freyther <freyther@openmoko.org>
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <asm/gpio.h>
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#include <mach/regs-gpio.h>
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#include <linux/gta02-shadow.h>
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/**
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* Shadow GPIO bank B handling. For the LEDs we need to keep track of the state
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* in software. The s3c2410_gpio_setpin must not be used for GPIOs on bank B
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*/
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static unsigned long gpb_mask;
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static unsigned long gpb_state;
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void gta02_gpb_add_shadow_gpio(unsigned int gpio)
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{
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unsigned long offset = S3C2410_GPIO_OFFSET(gpio);
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unsigned long flags;
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local_irq_save(flags);
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gpb_mask |= 1L << offset;
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(gta02_gpb_add_shadow_gpio);
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static void set_shadow_gpio(unsigned long offset, unsigned int value)
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{
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unsigned long state = value != 0;
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gpb_state &= ~(1L << offset);
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gpb_state |= state << offset;
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}
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void gta02_gpb_setpin(unsigned int pin, unsigned to)
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{
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void __iomem *base = S3C24XX_GPIO_BASE(S3C2410_GPB0);
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unsigned long offset = S3C2410_GPIO_OFFSET(pin);
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unsigned long flags;
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unsigned long dat;
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BUG_ON(base != S3C24XX_GPIO_BASE(pin));
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local_irq_save(flags);
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dat = __raw_readl(base + 0x04);
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/* Add the shadow values */
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dat &= ~gpb_mask;
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dat |= gpb_state;
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/* Do the operation like s3c2410_gpio_setpin */
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dat &= ~(1L << offset);
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dat |= to << offset;
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/* Update the shadow state */
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if ((1L << offset) & gpb_mask)
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set_shadow_gpio(offset, to);
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__raw_writel(dat, base + 0x04);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(gta02_gpb_setpin);
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