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include/asm-arm/arch-at91/gpio.h里面
#define AT91_PIN_PA0 (PIN_BASE + 0x00 + 0)
#define AT91_PIN_PA1 (PIN_BASE + 0x00 + 1)
#define AT91_PIN_PA2 (PIN_BASE + 0x00 + 2)
#define AT91_PIN_PA3 (PIN_BASE + 0x00 + 3)
................
有很多这种定义
我看了下
#define PIN_BASE NR_AIC_IRQS
#define NR_AIC_IRQS 32
请问上面的#define AT91_PIN_PA0 (PIN_BASE + 0x00 + 0)这些定义是在定义引脚 ,按这样的定义 PA0的值就为32了,看了芯片的封装 DATASHEET里这个引脚序号为42啊,AT91_PIN_PAi,AT91_PIN_PBi之类的值都与DATASHEET里的引脚序号值不符合
怎么回事呢,而且我也没看到DATASHEET里AT91_PIN_PB27 复用为了MCI的DETECT_PIN啊 怎么在 linux/drivers/mmc/host/at91_mci.c - ATMEL AT91 MCI Driverl文件里有:
static int __init at91_mci_probe(struct platform_device *pdev)
{
struct mmc_host *mmc;
struct at91mci_host *host;
struct resource *res;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
。。。。。。。。。。。。。。。。。。
/*
* monitor card insertion/removal if we can
*/
if (host->board->det_pin) {
ret = request_irq(gpio_to_irq(host->board->det_pin),
at91_mmc_det_irq, 0, mmc_hostname(mmc), host);
if (ret)
dev_warn(&pdev->dev, "request MMC detect irq failed\n");
else
device_init_wakeup(&pdev->dev, 1);
}
return ret;
}
据我的理解 正对EK开发板host->board->det_pin这个值就是在在linux/arch/arm/mach-at91/board-ek.c;里的初始化的ek_mmc_data .det_pin这个值
static struct at91_mmc_data __initdata ek_mmc_data = {
.det_pin = AT91_PIN_PB27,
.slot_b = 0,
.wire4 = 1,
.wp_pin = AT91_PIN_PA17,
};
不明白怎么把一个引脚跟系统的中断号给对应了起来,和调用request_irq(gpio_to_irq(host->board->det_pin),at91_mmc_det_irq, 0, mmc_hostname(mmc), host);来注册中断 |
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