s3c2410_gpio_setpin()系列函数
2017-08-03 14:07
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系列函数的定义在arch/arm/mach-s3c2410/gpio.c,相关的宏定义在include/asm-arm/arch-s3c2410/regs-gpio.h
(1)void s3c2410_gpio_setpin(unsigned int pin, unsigned int to);
设置相应GPIO口的输出值,例如:
pin=S3C2410_GPG2,to=0,则设置S3C2410_GPG2的输出值为0;
pin=S3C2410_GPG2,to=1,则设置S3C2410_GPG2的输出值为1。
函数定义:
(2)unsigned int s3c2410_gpio_getpin(unsigned int pin);
获取相应GPIO口的值。
函数定义: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 int function);
设置相应GPIO口的工作模式,输入、输出、中断等。
函数定义:
(4)unsigned int s3c2410_gpio_getcfg(unsigned int pin);
获取相应GPIO口的工作模式,输入、输出、中断等。
函数定义:
(5)void s3c2410_gpio_pullup(unsigned int pin, unsigned int to);
设置相应的GPIO口的电平,例如:
pin=S3C2410_GPG2,to=0,则拉低S3C2410_GPG2,也就是设置S3C2410_GPG2的值为0;
pin=S3C2410_GPG2,to=1,则拉高S3C2410_GPG2,也就是设置S3C2410_GPG2的值为1。
函数定义:
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);
杂项设置,设置寄存器MISCCR,具体看函数定义。
函数定义:
(7)int s3c2410_gpio_getirq(unsigned int pin);
获取相应的GPIO口所对应的中断号。
函数定义:
(8)int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on, unsigned int config);
中断过滤配置,具体看函数定义。
函数定义:
相应GPIO地址以及值的计算参考http://snailszzy.blog.163.com/blog/static/943990932010925102538499/
(1)void s3c2410_gpio_setpin(unsigned int pin, unsigned int to);
设置相应GPIO口的输出值,例如:
pin=S3C2410_GPG2,to=0,则设置S3C2410_GPG2的输出值为0;
pin=S3C2410_GPG2,to=1,则设置S3C2410_GPG2的输出值为1。
函数定义:
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 int pin);
获取相应GPIO口的值。
函数定义: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 int function);
设置相应GPIO口的工作模式,输入、输出、中断等。
函数定义:
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 int pin);
获取相应GPIO口的工作模式,输入、输出、中断等。
函数定义:
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)void s3c2410_gpio_pullup(unsigned int pin, unsigned int to);
设置相应的GPIO口的电平,例如:
pin=S3C2410_GPG2,to=0,则拉低S3C2410_GPG2,也就是设置S3C2410_GPG2的值为0;
pin=S3C2410_GPG2,to=1,则拉高S3C2410_GPG2,也就是设置S3C2410_GPG2的值为1。
函数定义:
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);
杂项设置,设置寄存器MISCCR,具体看函数定义。
函数定义:
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 int pin);
获取相应的GPIO口所对应的中断号。
函数定义:
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);
(8)int s3c2410_gpio_irqfilter(unsigned int pin, unsigned int on, unsigned int config);
中断过滤配置,具体看函数定义。
函数定义:
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);
相应GPIO地址以及值的计算参考http://snailszzy.blog.163.com/blog/static/943990932010925102538499/
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