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系列函數 系列函數的定義在arch/arm/mach-s3c2410/gpio.c，相關的宏定義在include/asm-arm/arch-s3c2410/regs-gpio.h
（1）void s3c2410_gpio_setpin(unsigned int pin, unsigned intto); 設置相應GPIO口的輸出值，例如：
pin=S3C2410_GPG2，to=0，則設置S3C2410＿GPG2的輸出值為0；
pin=S3C2410_GPG2，to=1，則設置S3C2410＿GPG2的輸出值為1。
函數定義： viewplain
- 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);
（2）unsigned int s3c2410_gpio_getpin(unsigned intpin); 獲取相應GPIO口的值。
函數定義： viewplain
- 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);
（3）void s3c2410_gpio_cfgpin(unsigned int pin, unsigned intfunction); 設置相應GPIO口的工作模式，輸入、輸出、中斷等。
函數定義： viewplain
- 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);
（4）unsigned int s3c2410_gpio_getcfg(unsigned intpin);獲取相應GPIO口的工作模式，輸入、輸出、中斷等。
函數定義： viewplain
- 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);
（5）voids3c2410_gpio_pullup(unsigned int pin, unsigned intto);
設置相應的GPIO口的電平，例如： pin=S3C2410_GPG2，to=0，則拉低S3C2410_GPG2，也就是設置S3C2410＿GPG2的值為0；
pin=S3C2410_GPG2，to=1，則拉高S3C2410_GPG2，也就是設置S3C2410＿GPG2的值為1。
函數定義： viewplain
- 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);
（6）unsigned int s3c2410_modify_misccr(unsigned int clear,unsigned int change);雜項設置，設置寄存器MISCCR，具體看函數定義。 函數定義： viewplain
- 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);
（7）int s3c2410_gpio_getirq(unsigned intpin);獲取相應的GPIO口所對應的中斷號。 函數定義： viewplain
- int s3c2410_gpio_getirq(unsigned int pin)
- {
- if (pin < S3C2410_GPF0 || pin > S3C2410_GPG15_EINT23)
- return -1;
-
- if (pin < S3C2410_GPG0 && pin > S3C2410_GPF7)
- return -1;
-
- 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);
（8）int s3c2410_gpio_irqfilter(unsigned int pin, unsignedint on, unsigned int config);中斷過濾配置，具體看函數定義。 函數定義： viewplain
- 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);
-
-
-
- val = __raw_readl(reg);
- val &= ~(0xff << ((pin & 3) * 8));
- val |= config << ((pin & 3) * 8);
- __raw_writel(val, reg);
-
-
-
- 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);
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