![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
214 lines
4.9 KiB
C
214 lines
4.9 KiB
C
/* linux/arch/arm/mach-s3c2410/gpio.c
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*
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* Copyright (c) 2004-2005 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C2410 GPIO support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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, MA 02111-1307 USA
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*
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* Changelog
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* 13-Sep-2004 BJD Implemented change of MISCCR
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* 14-Sep-2004 BJD Added getpin call
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* 14-Sep-2004 BJD Fixed bug in setpin() call
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* 30-Sep-2004 BJD Fixed cfgpin() mask bug
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* 01-Oct-2004 BJD Added getcfg() to get pin configuration
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* 01-Oct-2004 BJD Fixed mask bug in pullup() call
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* 01-Oct-2004 BJD Added getirq() to turn pin into irqno
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* 04-Oct-2004 BJD Added irq filter controls for GPIO
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* 05-Nov-2004 BJD EXPORT_SYMBOL() added for all code
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* 13-Mar-2005 BJD Updates for __iomem
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <asm/hardware.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/arch/regs-gpio.h>
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void s3c2410_gpio_cfgpin(unsigned int pin, unsigned int function)
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{
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void __iomem *base = S3C2410_GPIO_BASE(pin);
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unsigned long mask;
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unsigned long con;
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unsigned long flags;
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if (pin < S3C2410_GPIO_BANKB) {
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mask = 1 << S3C2410_GPIO_OFFSET(pin);
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} else {
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mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
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}
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local_irq_save(flags);
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con = __raw_readl(base + 0x00);
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con &= ~mask;
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con |= function;
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__raw_writel(con, base + 0x00);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(s3c2410_gpio_cfgpin);
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unsigned int s3c2410_gpio_getcfg(unsigned int pin)
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{
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void __iomem *base = S3C2410_GPIO_BASE(pin);
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unsigned long mask;
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if (pin < S3C2410_GPIO_BANKB) {
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mask = 1 << S3C2410_GPIO_OFFSET(pin);
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} else {
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mask = 3 << S3C2410_GPIO_OFFSET(pin)*2;
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}
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return __raw_readl(base) & mask;
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}
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EXPORT_SYMBOL(s3c2410_gpio_getcfg);
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void s3c2410_gpio_pullup(unsigned int pin, unsigned int to)
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{
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void __iomem *base = S3C2410_GPIO_BASE(pin);
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unsigned long offs = S3C2410_GPIO_OFFSET(pin);
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unsigned long flags;
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unsigned long up;
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if (pin < S3C2410_GPIO_BANKB)
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return;
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local_irq_save(flags);
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up = __raw_readl(base + 0x08);
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up &= ~(1L << offs);
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up |= to << offs;
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__raw_writel(up, base + 0x08);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(s3c2410_gpio_pullup);
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void s3c2410_gpio_setpin(unsigned int pin, unsigned int to)
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{
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void __iomem *base = S3C2410_GPIO_BASE(pin);
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unsigned long offs = S3C2410_GPIO_OFFSET(pin);
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unsigned long flags;
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unsigned long dat;
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local_irq_save(flags);
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dat = __raw_readl(base + 0x04);
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dat &= ~(1 << offs);
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dat |= to << offs;
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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(s3c2410_gpio_setpin);
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unsigned int s3c2410_gpio_getpin(unsigned int pin)
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{
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void __iomem *base = S3C2410_GPIO_BASE(pin);
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unsigned long offs = S3C2410_GPIO_OFFSET(pin);
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return __raw_readl(base + 0x04) & (1<< offs);
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}
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EXPORT_SYMBOL(s3c2410_gpio_getpin);
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unsigned int s3c2410_modify_misccr(unsigned int clear, unsigned int change)
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{
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unsigned long flags;
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unsigned long misccr;
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local_irq_save(flags);
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misccr = __raw_readl(S3C2410_MISCCR);
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misccr &= ~clear;
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misccr ^= change;
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__raw_writel(misccr, S3C2410_MISCCR);
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local_irq_restore(flags);
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return misccr;
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}
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EXPORT_SYMBOL(s3c2410_modify_misccr);
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int s3c2410_gpio_getirq(unsigned int pin)
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{
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if (pin < S3C2410_GPF0 || pin > S3C2410_GPG15_EINT23)
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return -1; /* not valid interrupts */
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if (pin < S3C2410_GPG0 && pin > S3C2410_GPF7)
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return -1; /* not valid pin */
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if (pin < S3C2410_GPF4)
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return (pin - S3C2410_GPF0) + IRQ_EINT0;
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if (pin < S3C2410_GPG0)
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return (pin - S3C2410_GPF4) + IRQ_EINT4;
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return (pin - S3C2410_GPG0) + IRQ_EINT8;
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}
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EXPORT_SYMBOL(s3c2410_gpio_getirq);
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int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on,
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unsigned int config)
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{
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void __iomem *reg = S3C2410_EINFLT0;
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unsigned long flags;
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unsigned long val;
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if (pin < S3C2410_GPG8 || pin > S3C2410_GPG15)
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return -1;
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config &= 0xff;
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pin -= S3C2410_GPG8_EINT16;
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reg += pin & ~3;
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local_irq_save(flags);
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/* update filter width and clock source */
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val = __raw_readl(reg);
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val &= ~(0xff << ((pin & 3) * 8));
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val |= config << ((pin & 3) * 8);
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__raw_writel(val, reg);
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/* update filter enable */
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val = __raw_readl(S3C2410_EXTINT2);
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val &= ~(1 << ((pin * 4) + 3));
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val |= on << ((pin * 4) + 3);
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__raw_writel(val, S3C2410_EXTINT2);
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local_irq_restore(flags);
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return 0;
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}
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EXPORT_SYMBOL(s3c2410_gpio_irqfilter);
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